obj-$(CONFIG_VIDEO_CAFE_CCIC) += cafe_ccic.o
+cafe_ccic-y := cafe-driver.o mcam-core.o
--- /dev/null
+/*
+ * A driver for the CMOS camera controller in the Marvell 88ALP01 "cafe"
+ * multifunction chip. Currently works with the Omnivision OV7670
+ * sensor.
+ *
+ * The data sheet for this device can be found at:
+ * http://www.marvell.com/products/pc_connectivity/88alp01/
+ *
+ * Copyright 2006-11 One Laptop Per Child Association, Inc.
+ * Copyright 2006-11 Jonathan Corbet <corbet@lwn.net>
+ *
+ * Written by Jonathan Corbet, corbet@lwn.net.
+ *
+ * v4l2_device/v4l2_subdev conversion by:
+ * Copyright (C) 2009 Hans Verkuil <hverkuil@xs4all.nl>
+ *
+ * Note: this conversion is untested! Please contact the linux-media
+ * mailinglist if you can test this, together with the test results.
+ *
+ * This file may be distributed under the terms of the GNU General
+ * Public License, version 2.
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+#include <linux/videodev2.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-chip-ident.h>
+#include <linux/device.h>
+#include <linux/wait.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+
+#include "mcam-core.h"
+
+#define CAFE_VERSION 0x000002
+
+
+/*
+ * Parameters.
+ */
+MODULE_AUTHOR("Jonathan Corbet <corbet@lwn.net>");
+MODULE_DESCRIPTION("Marvell 88ALP01 CMOS Camera Controller driver");
+MODULE_LICENSE("GPL");
+MODULE_SUPPORTED_DEVICE("Video");
+
+
+
+
+struct cafe_camera {
+ int registered; /* Fully initialized? */
+ struct mcam_camera mcam;
+ struct pci_dev *pdev;
+ wait_queue_head_t smbus_wait; /* Waiting on i2c events */
+};
+
+/*
+ * Debugging and related.
+ */
+#define cam_err(cam, fmt, arg...) \
+ dev_err(&(cam)->pdev->dev, fmt, ##arg);
+#define cam_warn(cam, fmt, arg...) \
+ dev_warn(&(cam)->pdev->dev, fmt, ##arg);
+
+/* -------------------------------------------------------------------- */
+/*
+ * The I2C/SMBUS interface to the camera itself starts here. The
+ * controller handles SMBUS itself, presenting a relatively simple register
+ * interface; all we have to do is to tell it where to route the data.
+ */
+#define CAFE_SMBUS_TIMEOUT (HZ) /* generous */
+
+static inline struct cafe_camera *to_cam(struct v4l2_device *dev)
+{
+ struct mcam_camera *m = container_of(dev, struct mcam_camera, v4l2_dev);
+ return container_of(m, struct cafe_camera, mcam);
+}
+
+
+static int cafe_smbus_write_done(struct mcam_camera *mcam)
+{
+ unsigned long flags;
+ int c1;
+
+ /*
+ * We must delay after the interrupt, or the controller gets confused
+ * and never does give us good status. Fortunately, we don't do this
+ * often.
+ */
+ udelay(20);
+ spin_lock_irqsave(&mcam->dev_lock, flags);
+ c1 = mcam_reg_read(mcam, REG_TWSIC1);
+ spin_unlock_irqrestore(&mcam->dev_lock, flags);
+ return (c1 & (TWSIC1_WSTAT|TWSIC1_ERROR)) != TWSIC1_WSTAT;
+}
+
+static int cafe_smbus_write_data(struct cafe_camera *cam,
+ u16 addr, u8 command, u8 value)
+{
+ unsigned int rval;
+ unsigned long flags;
+ struct mcam_camera *mcam = &cam->mcam;
+
+ spin_lock_irqsave(&mcam->dev_lock, flags);
+ rval = TWSIC0_EN | ((addr << TWSIC0_SID_SHIFT) & TWSIC0_SID);
+ rval |= TWSIC0_OVMAGIC; /* Make OV sensors work */
+ /*
+ * Marvell sez set clkdiv to all 1's for now.
+ */
+ rval |= TWSIC0_CLKDIV;
+ mcam_reg_write(mcam, REG_TWSIC0, rval);
+ (void) mcam_reg_read(mcam, REG_TWSIC1); /* force write */
+ rval = value | ((command << TWSIC1_ADDR_SHIFT) & TWSIC1_ADDR);
+ mcam_reg_write(mcam, REG_TWSIC1, rval);
+ spin_unlock_irqrestore(&mcam->dev_lock, flags);
+
+ /* Unfortunately, reading TWSIC1 too soon after sending a command
+ * causes the device to die.
+ * Use a busy-wait because we often send a large quantity of small
+ * commands at-once; using msleep() would cause a lot of context
+ * switches which take longer than 2ms, resulting in a noticeable
+ * boot-time and capture-start delays.
+ */
+ mdelay(2);
+
+ /*
+ * Another sad fact is that sometimes, commands silently complete but
+ * cafe_smbus_write_done() never becomes aware of this.
+ * This happens at random and appears to possible occur with any
+ * command.
+ * We don't understand why this is. We work around this issue
+ * with the timeout in the wait below, assuming that all commands
+ * complete within the timeout.
+ */
+ wait_event_timeout(cam->smbus_wait, cafe_smbus_write_done(mcam),
+ CAFE_SMBUS_TIMEOUT);
+
+ spin_lock_irqsave(&mcam->dev_lock, flags);
+ rval = mcam_reg_read(mcam, REG_TWSIC1);
+ spin_unlock_irqrestore(&mcam->dev_lock, flags);
+
+ if (rval & TWSIC1_WSTAT) {
+ cam_err(cam, "SMBUS write (%02x/%02x/%02x) timed out\n", addr,
+ command, value);
+ return -EIO;
+ }
+ if (rval & TWSIC1_ERROR) {
+ cam_err(cam, "SMBUS write (%02x/%02x/%02x) error\n", addr,
+ command, value);
+ return -EIO;
+ }
+ return 0;
+}
+
+
+
+static int cafe_smbus_read_done(struct mcam_camera *mcam)
+{
+ unsigned long flags;
+ int c1;
+
+ /*
+ * We must delay after the interrupt, or the controller gets confused
+ * and never does give us good status. Fortunately, we don't do this
+ * often.
+ */
+ udelay(20);
+ spin_lock_irqsave(&mcam->dev_lock, flags);
+ c1 = mcam_reg_read(mcam, REG_TWSIC1);
+ spin_unlock_irqrestore(&mcam->dev_lock, flags);
+ return c1 & (TWSIC1_RVALID|TWSIC1_ERROR);
+}
+
+
+
+static int cafe_smbus_read_data(struct cafe_camera *cam,
+ u16 addr, u8 command, u8 *value)
+{
+ unsigned int rval;
+ unsigned long flags;
+ struct mcam_camera *mcam = &cam->mcam;
+
+ spin_lock_irqsave(&mcam->dev_lock, flags);
+ rval = TWSIC0_EN | ((addr << TWSIC0_SID_SHIFT) & TWSIC0_SID);
+ rval |= TWSIC0_OVMAGIC; /* Make OV sensors work */
+ /*
+ * Marvel sez set clkdiv to all 1's for now.
+ */
+ rval |= TWSIC0_CLKDIV;
+ mcam_reg_write(mcam, REG_TWSIC0, rval);
+ (void) mcam_reg_read(mcam, REG_TWSIC1); /* force write */
+ rval = TWSIC1_READ | ((command << TWSIC1_ADDR_SHIFT) & TWSIC1_ADDR);
+ mcam_reg_write(mcam, REG_TWSIC1, rval);
+ spin_unlock_irqrestore(&mcam->dev_lock, flags);
+
+ wait_event_timeout(cam->smbus_wait,
+ cafe_smbus_read_done(mcam), CAFE_SMBUS_TIMEOUT);
+ spin_lock_irqsave(&mcam->dev_lock, flags);
+ rval = mcam_reg_read(mcam, REG_TWSIC1);
+ spin_unlock_irqrestore(&mcam->dev_lock, flags);
+
+ if (rval & TWSIC1_ERROR) {
+ cam_err(cam, "SMBUS read (%02x/%02x) error\n", addr, command);
+ return -EIO;
+ }
+ if (!(rval & TWSIC1_RVALID)) {
+ cam_err(cam, "SMBUS read (%02x/%02x) timed out\n", addr,
+ command);
+ return -EIO;
+ }
+ *value = rval & 0xff;
+ return 0;
+}
+
+/*
+ * Perform a transfer over SMBUS. This thing is called under
+ * the i2c bus lock, so we shouldn't race with ourselves...
+ */
+static int cafe_smbus_xfer(struct i2c_adapter *adapter, u16 addr,
+ unsigned short flags, char rw, u8 command,
+ int size, union i2c_smbus_data *data)
+{
+ struct cafe_camera *cam = i2c_get_adapdata(adapter);
+ int ret = -EINVAL;
+
+ /*
+ * This interface would appear to only do byte data ops. OK
+ * it can do word too, but the cam chip has no use for that.
+ */
+ if (size != I2C_SMBUS_BYTE_DATA) {
+ cam_err(cam, "funky xfer size %d\n", size);
+ return -EINVAL;
+ }
+
+ if (rw == I2C_SMBUS_WRITE)
+ ret = cafe_smbus_write_data(cam, addr, command, data->byte);
+ else if (rw == I2C_SMBUS_READ)
+ ret = cafe_smbus_read_data(cam, addr, command, &data->byte);
+ return ret;
+}
+
+
+static void cafe_smbus_enable_irq(struct cafe_camera *cam)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&cam->mcam.dev_lock, flags);
+ mcam_reg_set_bit(&cam->mcam, REG_IRQMASK, TWSIIRQS);
+ spin_unlock_irqrestore(&cam->mcam.dev_lock, flags);
+}
+
+static u32 cafe_smbus_func(struct i2c_adapter *adapter)
+{
+ return I2C_FUNC_SMBUS_READ_BYTE_DATA |
+ I2C_FUNC_SMBUS_WRITE_BYTE_DATA;
+}
+
+static struct i2c_algorithm cafe_smbus_algo = {
+ .smbus_xfer = cafe_smbus_xfer,
+ .functionality = cafe_smbus_func
+};
+
+static int cafe_smbus_setup(struct cafe_camera *cam)
+{
+ struct i2c_adapter *adap = &cam->mcam.i2c_adapter;
+ int ret;
+
+ cafe_smbus_enable_irq(cam);
+ adap->owner = THIS_MODULE;
+ adap->algo = &cafe_smbus_algo;
+ strcpy(adap->name, "cafe_ccic");
+ adap->dev.parent = &cam->pdev->dev;
+ i2c_set_adapdata(adap, cam);
+ ret = i2c_add_adapter(adap);
+ if (ret)
+ printk(KERN_ERR "Unable to register cafe i2c adapter\n");
+ return ret;
+}
+
+static void cafe_smbus_shutdown(struct cafe_camera *cam)
+{
+ i2c_del_adapter(&cam->mcam.i2c_adapter);
+}
+
+
+/*
+ * Controller-level stuff
+ */
+
+static void cafe_ctlr_init(struct mcam_camera *mcam)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&mcam->dev_lock, flags);
+ /*
+ * Added magic to bring up the hardware on the B-Test board
+ */
+ mcam_reg_write(mcam, 0x3038, 0x8);
+ mcam_reg_write(mcam, 0x315c, 0x80008);
+ /*
+ * Go through the dance needed to wake the device up.
+ * Note that these registers are global and shared
+ * with the NAND and SD devices. Interaction between the
+ * three still needs to be examined.
+ */
+ mcam_reg_write(mcam, REG_GL_CSR, GCSR_SRS|GCSR_MRS); /* Needed? */
+ mcam_reg_write(mcam, REG_GL_CSR, GCSR_SRC|GCSR_MRC);
+ mcam_reg_write(mcam, REG_GL_CSR, GCSR_SRC|GCSR_MRS);
+ /*
+ * Here we must wait a bit for the controller to come around.
+ */
+ spin_unlock_irqrestore(&mcam->dev_lock, flags);
+ msleep(5);
+ spin_lock_irqsave(&mcam->dev_lock, flags);
+
+ mcam_reg_write(mcam, REG_GL_CSR, GCSR_CCIC_EN|GCSR_SRC|GCSR_MRC);
+ mcam_reg_set_bit(mcam, REG_GL_IMASK, GIMSK_CCIC_EN);
+ /*
+ * Mask all interrupts.
+ */
+ mcam_reg_write(mcam, REG_IRQMASK, 0);
+ spin_unlock_irqrestore(&mcam->dev_lock, flags);
+}
+
+
+static void cafe_ctlr_power_up(struct mcam_camera *mcam)
+{
+ /*
+ * Part one of the sensor dance: turn the global
+ * GPIO signal on.
+ */
+ mcam_reg_write(mcam, REG_GL_FCR, GFCR_GPIO_ON);
+ mcam_reg_write(mcam, REG_GL_GPIOR, GGPIO_OUT|GGPIO_VAL);
+ /*
+ * Put the sensor into operational mode (assumes OLPC-style
+ * wiring). Control 0 is reset - set to 1 to operate.
+ * Control 1 is power down, set to 0 to operate.
+ */
+ mcam_reg_write(mcam, REG_GPR, GPR_C1EN|GPR_C0EN); /* pwr up, reset */
+ mcam_reg_write(mcam, REG_GPR, GPR_C1EN|GPR_C0EN|GPR_C0);
+}
+
+static void cafe_ctlr_power_down(struct mcam_camera *mcam)
+{
+ mcam_reg_write(mcam, REG_GPR, GPR_C1EN|GPR_C0EN|GPR_C1);
+ mcam_reg_write(mcam, REG_GL_FCR, GFCR_GPIO_ON);
+ mcam_reg_write(mcam, REG_GL_GPIOR, GGPIO_OUT);
+}
+
+
+
+/*
+ * The platform interrupt handler.
+ */
+static irqreturn_t cafe_irq(int irq, void *data)
+{
+ struct cafe_camera *cam = data;
+ struct mcam_camera *mcam = &cam->mcam;
+ unsigned int irqs, handled;
+
+ spin_lock(&mcam->dev_lock);
+ irqs = mcam_reg_read(mcam, REG_IRQSTAT);
+ handled = cam->registered && mccic_irq(mcam, irqs);
+ if (irqs & TWSIIRQS) {
+ mcam_reg_write(mcam, REG_IRQSTAT, TWSIIRQS);
+ wake_up(&cam->smbus_wait);
+ handled = 1;
+ }
+ spin_unlock(&mcam->dev_lock);
+ return IRQ_RETVAL(handled);
+}
+
+
+/* -------------------------------------------------------------------------- */
+/*
+ * PCI interface stuff.
+ */
+
+static int cafe_pci_probe(struct pci_dev *pdev,
+ const struct pci_device_id *id)
+{
+ int ret;
+ struct cafe_camera *cam;
+ struct mcam_camera *mcam;
+
+ /*
+ * Start putting together one of our big camera structures.
+ */
+ ret = -ENOMEM;
+ cam = kzalloc(sizeof(struct cafe_camera), GFP_KERNEL);
+ if (cam == NULL)
+ goto out;
+ cam->pdev = pdev;
+ mcam = &cam->mcam;
+ mcam->chip_id = V4L2_IDENT_CAFE;
+ spin_lock_init(&mcam->dev_lock);
+ init_waitqueue_head(&cam->smbus_wait);
+ mcam->plat_power_up = cafe_ctlr_power_up;
+ mcam->plat_power_down = cafe_ctlr_power_down;
+ mcam->dev = &pdev->dev;
+ /*
+ * Get set up on the PCI bus.
+ */
+ ret = pci_enable_device(pdev);
+ if (ret)
+ goto out_free;
+ pci_set_master(pdev);
+
+ ret = -EIO;
+ mcam->regs = pci_iomap(pdev, 0, 0);
+ if (!mcam->regs) {
+ printk(KERN_ERR "Unable to ioremap cafe-ccic regs\n");
+ goto out_disable;
+ }
+ ret = request_irq(pdev->irq, cafe_irq, IRQF_SHARED, "cafe-ccic", cam);
+ if (ret)
+ goto out_iounmap;
+
+ /*
+ * Initialize the controller and leave it powered up. It will
+ * stay that way until the sensor driver shows up.
+ */
+ cafe_ctlr_init(mcam);
+ cafe_ctlr_power_up(mcam);
+ /*
+ * Set up I2C/SMBUS communications. We have to drop the mutex here
+ * because the sensor could attach in this call chain, leading to
+ * unsightly deadlocks.
+ */
+ ret = cafe_smbus_setup(cam);
+ if (ret)
+ goto out_pdown;
+
+ ret = mccic_register(mcam);
+ if (ret == 0) {
+ cam->registered = 1;
+ return 0;
+ }
+
+ cafe_smbus_shutdown(cam);
+out_pdown:
+ cafe_ctlr_power_down(mcam);
+ free_irq(pdev->irq, cam);
+out_iounmap:
+ pci_iounmap(pdev, mcam->regs);
+out_disable:
+ pci_disable_device(pdev);
+out_free:
+ kfree(cam);
+out:
+ return ret;
+}
+
+
+/*
+ * Shut down an initialized device
+ */
+static void cafe_shutdown(struct cafe_camera *cam)
+{
+ mccic_shutdown(&cam->mcam);
+ cafe_smbus_shutdown(cam);
+ free_irq(cam->pdev->irq, cam);
+ pci_iounmap(cam->pdev, cam->mcam.regs);
+}
+
+
+static void cafe_pci_remove(struct pci_dev *pdev)
+{
+ struct v4l2_device *v4l2_dev = dev_get_drvdata(&pdev->dev);
+ struct cafe_camera *cam = to_cam(v4l2_dev);
+
+ if (cam == NULL) {
+ printk(KERN_WARNING "pci_remove on unknown pdev %p\n", pdev);
+ return;
+ }
+ cafe_shutdown(cam);
+ kfree(cam);
+}
+
+
+#ifdef CONFIG_PM
+/*
+ * Basic power management.
+ */
+static int cafe_pci_suspend(struct pci_dev *pdev, pm_message_t state)
+{
+ struct v4l2_device *v4l2_dev = dev_get_drvdata(&pdev->dev);
+ struct cafe_camera *cam = to_cam(v4l2_dev);
+ int ret;
+
+ ret = pci_save_state(pdev);
+ if (ret)
+ return ret;
+ mccic_suspend(&cam->mcam);
+ pci_disable_device(pdev);
+ return 0;
+}
+
+
+static int cafe_pci_resume(struct pci_dev *pdev)
+{
+ struct v4l2_device *v4l2_dev = dev_get_drvdata(&pdev->dev);
+ struct cafe_camera *cam = to_cam(v4l2_dev);
+ int ret = 0;
+
+ pci_restore_state(pdev);
+ ret = pci_enable_device(pdev);
+
+ if (ret) {
+ cam_warn(cam, "Unable to re-enable device on resume!\n");
+ return ret;
+ }
+ cafe_ctlr_init(&cam->mcam);
+ return mccic_resume(&cam->mcam);
+}
+
+#endif /* CONFIG_PM */
+
+static struct pci_device_id cafe_ids[] = {
+ { PCI_DEVICE(PCI_VENDOR_ID_MARVELL,
+ PCI_DEVICE_ID_MARVELL_88ALP01_CCIC) },
+ { 0, }
+};
+
+MODULE_DEVICE_TABLE(pci, cafe_ids);
+
+static struct pci_driver cafe_pci_driver = {
+ .name = "cafe1000-ccic",
+ .id_table = cafe_ids,
+ .probe = cafe_pci_probe,
+ .remove = cafe_pci_remove,
+#ifdef CONFIG_PM
+ .suspend = cafe_pci_suspend,
+ .resume = cafe_pci_resume,
+#endif
+};
+
+
+
+
+static int __init cafe_init(void)
+{
+ int ret;
+
+ printk(KERN_NOTICE "Marvell M88ALP01 'CAFE' Camera Controller version %d\n",
+ CAFE_VERSION);
+ ret = pci_register_driver(&cafe_pci_driver);
+ if (ret) {
+ printk(KERN_ERR "Unable to register cafe_ccic driver\n");
+ goto out;
+ }
+ ret = 0;
+
+out:
+ return ret;
+}
+
+
+static void __exit cafe_exit(void)
+{
+ pci_unregister_driver(&cafe_pci_driver);
+}
+
+module_init(cafe_init);
+module_exit(cafe_exit);
+++ /dev/null
-/*
- * Register definitions for the m88alp01 camera interface. Offsets in bytes
- * as given in the spec.
- *
- * Copyright 2006 One Laptop Per Child Association, Inc.
- *
- * Written by Jonathan Corbet, corbet@lwn.net.
- *
- * This file may be distributed under the terms of the GNU General
- * Public License, version 2.
- */
-#define REG_Y0BAR 0x00
-#define REG_Y1BAR 0x04
-#define REG_Y2BAR 0x08
-/* ... */
-
-#define REG_IMGPITCH 0x24 /* Image pitch register */
-#define IMGP_YP_SHFT 2 /* Y pitch params */
-#define IMGP_YP_MASK 0x00003ffc /* Y pitch field */
-#define IMGP_UVP_SHFT 18 /* UV pitch (planar) */
-#define IMGP_UVP_MASK 0x3ffc0000
-#define REG_IRQSTATRAW 0x28 /* RAW IRQ Status */
-#define IRQ_EOF0 0x00000001 /* End of frame 0 */
-#define IRQ_EOF1 0x00000002 /* End of frame 1 */
-#define IRQ_EOF2 0x00000004 /* End of frame 2 */
-#define IRQ_SOF0 0x00000008 /* Start of frame 0 */
-#define IRQ_SOF1 0x00000010 /* Start of frame 1 */
-#define IRQ_SOF2 0x00000020 /* Start of frame 2 */
-#define IRQ_OVERFLOW 0x00000040 /* FIFO overflow */
-#define IRQ_TWSIW 0x00010000 /* TWSI (smbus) write */
-#define IRQ_TWSIR 0x00020000 /* TWSI read */
-#define IRQ_TWSIE 0x00040000 /* TWSI error */
-#define TWSIIRQS (IRQ_TWSIW|IRQ_TWSIR|IRQ_TWSIE)
-#define FRAMEIRQS (IRQ_EOF0|IRQ_EOF1|IRQ_EOF2|IRQ_SOF0|IRQ_SOF1|IRQ_SOF2)
-#define ALLIRQS (TWSIIRQS|FRAMEIRQS|IRQ_OVERFLOW)
-#define REG_IRQMASK 0x2c /* IRQ mask - same bits as IRQSTAT */
-#define REG_IRQSTAT 0x30 /* IRQ status / clear */
-
-#define REG_IMGSIZE 0x34 /* Image size */
-#define IMGSZ_V_MASK 0x1fff0000
-#define IMGSZ_V_SHIFT 16
-#define IMGSZ_H_MASK 0x00003fff
-#define REG_IMGOFFSET 0x38 /* IMage offset */
-
-#define REG_CTRL0 0x3c /* Control 0 */
-#define C0_ENABLE 0x00000001 /* Makes the whole thing go */
-
-/* Mask for all the format bits */
-#define C0_DF_MASK 0x00fffffc /* Bits 2-23 */
-
-/* RGB ordering */
-#define C0_RGB4_RGBX 0x00000000
-#define C0_RGB4_XRGB 0x00000004
-#define C0_RGB4_BGRX 0x00000008
-#define C0_RGB4_XBGR 0x0000000c
-#define C0_RGB5_RGGB 0x00000000
-#define C0_RGB5_GRBG 0x00000004
-#define C0_RGB5_GBRG 0x00000008
-#define C0_RGB5_BGGR 0x0000000c
-
-/* Spec has two fields for DIN and DOUT, but they must match, so
- combine them here. */
-#define C0_DF_YUV 0x00000000 /* Data is YUV */
-#define C0_DF_RGB 0x000000a0 /* ... RGB */
-#define C0_DF_BAYER 0x00000140 /* ... Bayer */
-/* 8-8-8 must be missing from the below - ask */
-#define C0_RGBF_565 0x00000000
-#define C0_RGBF_444 0x00000800
-#define C0_RGB_BGR 0x00001000 /* Blue comes first */
-#define C0_YUV_PLANAR 0x00000000 /* YUV 422 planar format */
-#define C0_YUV_PACKED 0x00008000 /* YUV 422 packed */
-#define C0_YUV_420PL 0x0000a000 /* YUV 420 planar */
-/* Think that 420 packed must be 111 - ask */
-#define C0_YUVE_YUYV 0x00000000 /* Y1CbY0Cr */
-#define C0_YUVE_YVYU 0x00010000 /* Y1CrY0Cb */
-#define C0_YUVE_VYUY 0x00020000 /* CrY1CbY0 */
-#define C0_YUVE_UYVY 0x00030000 /* CbY1CrY0 */
-#define C0_YUVE_XYUV 0x00000000 /* 420: .YUV */
-#define C0_YUVE_XYVU 0x00010000 /* 420: .YVU */
-#define C0_YUVE_XUVY 0x00020000 /* 420: .UVY */
-#define C0_YUVE_XVUY 0x00030000 /* 420: .VUY */
-/* Bayer bits 18,19 if needed */
-#define C0_HPOL_LOW 0x01000000 /* HSYNC polarity active low */
-#define C0_VPOL_LOW 0x02000000 /* VSYNC polarity active low */
-#define C0_VCLK_LOW 0x04000000 /* VCLK on falling edge */
-#define C0_DOWNSCALE 0x08000000 /* Enable downscaler */
-#define C0_SIFM_MASK 0xc0000000 /* SIF mode bits */
-#define C0_SIF_HVSYNC 0x00000000 /* Use H/VSYNC */
-#define CO_SOF_NOSYNC 0x40000000 /* Use inband active signaling */
-
-
-#define REG_CTRL1 0x40 /* Control 1 */
-#define C1_444ALPHA 0x00f00000 /* Alpha field in RGB444 */
-#define C1_ALPHA_SHFT 20
-#define C1_DMAB32 0x00000000 /* 32-byte DMA burst */
-#define C1_DMAB16 0x02000000 /* 16-byte DMA burst */
-#define C1_DMAB64 0x04000000 /* 64-byte DMA burst */
-#define C1_DMAB_MASK 0x06000000
-#define C1_TWOBUFS 0x08000000 /* Use only two DMA buffers */
-#define C1_PWRDWN 0x10000000 /* Power down */
-
-#define REG_CLKCTRL 0x88 /* Clock control */
-#define CLK_DIV_MASK 0x0000ffff /* Upper bits RW "reserved" */
-
-#define REG_GPR 0xb4 /* General purpose register. This
- controls inputs to the power and reset
- pins on the OV7670 used with OLPC;
- other deployments could differ. */
-#define GPR_C1EN 0x00000020 /* Pad 1 (power down) enable */
-#define GPR_C0EN 0x00000010 /* Pad 0 (reset) enable */
-#define GPR_C1 0x00000002 /* Control 1 value */
-/*
- * Control 0 is wired to reset on OLPC machines. For ov7x sensors,
- * it is active low, for 0v6x, instead, it's active high. What
- * fun.
- */
-#define GPR_C0 0x00000001 /* Control 0 value */
-
-#define REG_TWSIC0 0xb8 /* TWSI (smbus) control 0 */
-#define TWSIC0_EN 0x00000001 /* TWSI enable */
-#define TWSIC0_MODE 0x00000002 /* 1 = 16-bit, 0 = 8-bit */
-#define TWSIC0_SID 0x000003fc /* Slave ID */
-#define TWSIC0_SID_SHIFT 2
-#define TWSIC0_CLKDIV 0x0007fc00 /* Clock divider */
-#define TWSIC0_MASKACK 0x00400000 /* Mask ack from sensor */
-#define TWSIC0_OVMAGIC 0x00800000 /* Make it work on OV sensors */
-
-#define REG_TWSIC1 0xbc /* TWSI control 1 */
-#define TWSIC1_DATA 0x0000ffff /* Data to/from camchip */
-#define TWSIC1_ADDR 0x00ff0000 /* Address (register) */
-#define TWSIC1_ADDR_SHIFT 16
-#define TWSIC1_READ 0x01000000 /* Set for read op */
-#define TWSIC1_WSTAT 0x02000000 /* Write status */
-#define TWSIC1_RVALID 0x04000000 /* Read data valid */
-#define TWSIC1_ERROR 0x08000000 /* Something screwed up */
-
-
-#define REG_UBAR 0xc4 /* Upper base address register */
-
-/*
- * Here's the weird global control registers which are said to live
- * way up here.
- */
-#define REG_GL_CSR 0x3004 /* Control/status register */
-#define GCSR_SRS 0x00000001 /* SW Reset set */
-#define GCSR_SRC 0x00000002 /* SW Reset clear */
-#define GCSR_MRS 0x00000004 /* Master reset set */
-#define GCSR_MRC 0x00000008 /* HW Reset clear */
-#define GCSR_CCIC_EN 0x00004000 /* CCIC Clock enable */
-#define REG_GL_IMASK 0x300c /* Interrupt mask register */
-#define GIMSK_CCIC_EN 0x00000004 /* CCIC Interrupt enable */
-
-#define REG_GL_FCR 0x3038 /* GPIO functional control register */
-#define GFCR_GPIO_ON 0x08 /* Camera GPIO enabled */
-#define REG_GL_GPIOR 0x315c /* GPIO register */
-#define GGPIO_OUT 0x80000 /* GPIO output */
-#define GGPIO_VAL 0x00008 /* Output pin value */
-
-#define REG_LEN REG_GL_IMASK + 4
-
-
-/*
- * Useful stuff that probably belongs somewhere global.
- */
-#define VGA_WIDTH 640
-#define VGA_HEIGHT 480
+++ /dev/null
-/*
- * A driver for the CMOS camera controller in the Marvell 88ALP01 "cafe"
- * multifunction chip. Currently works with the Omnivision OV7670
- * sensor.
- *
- * The data sheet for this device can be found at:
- * http://www.marvell.com/products/pc_connectivity/88alp01/
- *
- * Copyright 2006 One Laptop Per Child Association, Inc.
- * Copyright 2006-7 Jonathan Corbet <corbet@lwn.net>
- *
- * Written by Jonathan Corbet, corbet@lwn.net.
- *
- * v4l2_device/v4l2_subdev conversion by:
- * Copyright (C) 2009 Hans Verkuil <hverkuil@xs4all.nl>
- *
- * Note: this conversion is untested! Please contact the linux-media
- * mailinglist if you can test this, together with the test results.
- *
- * This file may be distributed under the terms of the GNU General
- * Public License, version 2.
- */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/fs.h>
-#include <linux/dmi.h>
-#include <linux/mm.h>
-#include <linux/pci.h>
-#include <linux/i2c.h>
-#include <linux/interrupt.h>
-#include <linux/spinlock.h>
-#include <linux/videodev2.h>
-#include <linux/slab.h>
-#include <media/v4l2-device.h>
-#include <media/v4l2-ioctl.h>
-#include <media/v4l2-chip-ident.h>
-#include <media/ov7670.h>
-#include <linux/device.h>
-#include <linux/wait.h>
-#include <linux/list.h>
-#include <linux/dma-mapping.h>
-#include <linux/delay.h>
-#include <linux/jiffies.h>
-#include <linux/vmalloc.h>
-
-#include <asm/uaccess.h>
-#include <asm/io.h>
-
-#include "cafe_ccic-regs.h"
-
-#define CAFE_VERSION 0x000002
-
-
-/*
- * Parameters.
- */
-MODULE_AUTHOR("Jonathan Corbet <corbet@lwn.net>");
-MODULE_DESCRIPTION("Marvell 88ALP01 CMOS Camera Controller driver");
-MODULE_LICENSE("GPL");
-MODULE_SUPPORTED_DEVICE("Video");
-
-/*
- * Internal DMA buffer management. Since the controller cannot do S/G I/O,
- * we must have physically contiguous buffers to bring frames into.
- * These parameters control how many buffers we use, whether we
- * allocate them at load time (better chance of success, but nails down
- * memory) or when somebody tries to use the camera (riskier), and,
- * for load-time allocation, how big they should be.
- *
- * The controller can cycle through three buffers. We could use
- * more by flipping pointers around, but it probably makes little
- * sense.
- */
-
-#define MAX_DMA_BUFS 3
-static int alloc_bufs_at_read;
-module_param(alloc_bufs_at_read, bool, 0444);
-MODULE_PARM_DESC(alloc_bufs_at_read,
- "Non-zero value causes DMA buffers to be allocated when the "
- "video capture device is read, rather than at module load "
- "time. This saves memory, but decreases the chances of "
- "successfully getting those buffers.");
-
-static int n_dma_bufs = 3;
-module_param(n_dma_bufs, uint, 0644);
-MODULE_PARM_DESC(n_dma_bufs,
- "The number of DMA buffers to allocate. Can be either two "
- "(saves memory, makes timing tighter) or three.");
-
-static int dma_buf_size = VGA_WIDTH * VGA_HEIGHT * 2; /* Worst case */
-module_param(dma_buf_size, uint, 0444);
-MODULE_PARM_DESC(dma_buf_size,
- "The size of the allocated DMA buffers. If actual operating "
- "parameters require larger buffers, an attempt to reallocate "
- "will be made.");
-
-static int min_buffers = 1;
-module_param(min_buffers, uint, 0644);
-MODULE_PARM_DESC(min_buffers,
- "The minimum number of streaming I/O buffers we are willing "
- "to work with.");
-
-static int max_buffers = 10;
-module_param(max_buffers, uint, 0644);
-MODULE_PARM_DESC(max_buffers,
- "The maximum number of streaming I/O buffers an application "
- "will be allowed to allocate. These buffers are big and live "
- "in vmalloc space.");
-
-static int flip;
-module_param(flip, bool, 0444);
-MODULE_PARM_DESC(flip,
- "If set, the sensor will be instructed to flip the image "
- "vertically.");
-
-
-enum cafe_state {
- S_NOTREADY, /* Not yet initialized */
- S_IDLE, /* Just hanging around */
- S_FLAKED, /* Some sort of problem */
- S_SINGLEREAD, /* In read() */
- S_SPECREAD, /* Speculative read (for future read()) */
- S_STREAMING /* Streaming data */
-};
-
-/*
- * Tracking of streaming I/O buffers.
- */
-struct cafe_sio_buffer {
- struct list_head list;
- struct v4l2_buffer v4lbuf;
- char *buffer; /* Where it lives in kernel space */
- int mapcount;
- struct cafe_camera *cam;
-};
-
-/*
- * A description of one of our devices.
- * Locking: controlled by s_mutex. Certain fields, however, require
- * the dev_lock spinlock; they are marked as such by comments.
- * dev_lock is also required for access to device registers.
- */
-struct cafe_camera
-{
- struct v4l2_device v4l2_dev;
- enum cafe_state state;
- unsigned long flags; /* Buffer status, mainly (dev_lock) */
- int users; /* How many open FDs */
- struct file *owner; /* Who has data access (v4l2) */
-
- /*
- * Subsystem structures.
- */
- struct pci_dev *pdev;
- struct video_device vdev;
- struct i2c_adapter i2c_adapter;
- struct v4l2_subdev *sensor;
- unsigned short sensor_addr;
-
- unsigned char __iomem *regs;
- struct list_head dev_list; /* link to other devices */
-
- /* DMA buffers */
- unsigned int nbufs; /* How many are alloc'd */
- int next_buf; /* Next to consume (dev_lock) */
- unsigned int dma_buf_size; /* allocated size */
- void *dma_bufs[MAX_DMA_BUFS]; /* Internal buffer addresses */
- dma_addr_t dma_handles[MAX_DMA_BUFS]; /* Buffer bus addresses */
- unsigned int specframes; /* Unconsumed spec frames (dev_lock) */
- unsigned int sequence; /* Frame sequence number */
- unsigned int buf_seq[MAX_DMA_BUFS]; /* Sequence for individual buffers */
-
- /* Streaming buffers */
- unsigned int n_sbufs; /* How many we have */
- struct cafe_sio_buffer *sb_bufs; /* The array of housekeeping structs */
- struct list_head sb_avail; /* Available for data (we own) (dev_lock) */
- struct list_head sb_full; /* With data (user space owns) (dev_lock) */
- struct tasklet_struct s_tasklet;
-
- /* Current operating parameters */
- u32 sensor_type; /* Currently ov7670 only */
- struct v4l2_pix_format pix_format;
- enum v4l2_mbus_pixelcode mbus_code;
-
- /* Locks */
- struct mutex s_mutex; /* Access to this structure */
- spinlock_t dev_lock; /* Access to device */
-
- /* Misc */
- wait_queue_head_t smbus_wait; /* Waiting on i2c events */
- wait_queue_head_t iowait; /* Waiting on frame data */
-};
-
-/*
- * Status flags. Always manipulated with bit operations.
- */
-#define CF_BUF0_VALID 0 /* Buffers valid - first three */
-#define CF_BUF1_VALID 1
-#define CF_BUF2_VALID 2
-#define CF_DMA_ACTIVE 3 /* A frame is incoming */
-#define CF_CONFIG_NEEDED 4 /* Must configure hardware */
-
-#define sensor_call(cam, o, f, args...) \
- v4l2_subdev_call(cam->sensor, o, f, ##args)
-
-static inline struct cafe_camera *to_cam(struct v4l2_device *dev)
-{
- return container_of(dev, struct cafe_camera, v4l2_dev);
-}
-
-static struct cafe_format_struct {
- __u8 *desc;
- __u32 pixelformat;
- int bpp; /* Bytes per pixel */
- enum v4l2_mbus_pixelcode mbus_code;
-} cafe_formats[] = {
- {
- .desc = "YUYV 4:2:2",
- .pixelformat = V4L2_PIX_FMT_YUYV,
- .mbus_code = V4L2_MBUS_FMT_YUYV8_2X8,
- .bpp = 2,
- },
- {
- .desc = "RGB 444",
- .pixelformat = V4L2_PIX_FMT_RGB444,
- .mbus_code = V4L2_MBUS_FMT_RGB444_2X8_PADHI_LE,
- .bpp = 2,
- },
- {
- .desc = "RGB 565",
- .pixelformat = V4L2_PIX_FMT_RGB565,
- .mbus_code = V4L2_MBUS_FMT_RGB565_2X8_LE,
- .bpp = 2,
- },
- {
- .desc = "Raw RGB Bayer",
- .pixelformat = V4L2_PIX_FMT_SBGGR8,
- .mbus_code = V4L2_MBUS_FMT_SBGGR8_1X8,
- .bpp = 1
- },
-};
-#define N_CAFE_FMTS ARRAY_SIZE(cafe_formats)
-
-static struct cafe_format_struct *cafe_find_format(u32 pixelformat)
-{
- unsigned i;
-
- for (i = 0; i < N_CAFE_FMTS; i++)
- if (cafe_formats[i].pixelformat == pixelformat)
- return cafe_formats + i;
- /* Not found? Then return the first format. */
- return cafe_formats;
-}
-
-/*
- * Start over with DMA buffers - dev_lock needed.
- */
-static void cafe_reset_buffers(struct cafe_camera *cam)
-{
- int i;
-
- cam->next_buf = -1;
- for (i = 0; i < cam->nbufs; i++)
- clear_bit(i, &cam->flags);
- cam->specframes = 0;
-}
-
-static inline int cafe_needs_config(struct cafe_camera *cam)
-{
- return test_bit(CF_CONFIG_NEEDED, &cam->flags);
-}
-
-static void cafe_set_config_needed(struct cafe_camera *cam, int needed)
-{
- if (needed)
- set_bit(CF_CONFIG_NEEDED, &cam->flags);
- else
- clear_bit(CF_CONFIG_NEEDED, &cam->flags);
-}
-
-
-
-
-/*
- * Debugging and related.
- */
-#define cam_err(cam, fmt, arg...) \
- dev_err(&(cam)->pdev->dev, fmt, ##arg);
-#define cam_warn(cam, fmt, arg...) \
- dev_warn(&(cam)->pdev->dev, fmt, ##arg);
-#define cam_dbg(cam, fmt, arg...) \
- dev_dbg(&(cam)->pdev->dev, fmt, ##arg);
-
-
-/* ---------------------------------------------------------------------*/
-
-/*
- * Device register I/O
- */
-static inline void cafe_reg_write(struct cafe_camera *cam, unsigned int reg,
- unsigned int val)
-{
- iowrite32(val, cam->regs + reg);
-}
-
-static inline unsigned int cafe_reg_read(struct cafe_camera *cam,
- unsigned int reg)
-{
- return ioread32(cam->regs + reg);
-}
-
-
-static inline void cafe_reg_write_mask(struct cafe_camera *cam, unsigned int reg,
- unsigned int val, unsigned int mask)
-{
- unsigned int v = cafe_reg_read(cam, reg);
-
- v = (v & ~mask) | (val & mask);
- cafe_reg_write(cam, reg, v);
-}
-
-static inline void cafe_reg_clear_bit(struct cafe_camera *cam,
- unsigned int reg, unsigned int val)
-{
- cafe_reg_write_mask(cam, reg, 0, val);
-}
-
-static inline void cafe_reg_set_bit(struct cafe_camera *cam,
- unsigned int reg, unsigned int val)
-{
- cafe_reg_write_mask(cam, reg, val, val);
-}
-
-
-
-/* -------------------------------------------------------------------- */
-/*
- * The I2C/SMBUS interface to the camera itself starts here. The
- * controller handles SMBUS itself, presenting a relatively simple register
- * interface; all we have to do is to tell it where to route the data.
- */
-#define CAFE_SMBUS_TIMEOUT (HZ) /* generous */
-
-static int cafe_smbus_write_done(struct cafe_camera *cam)
-{
- unsigned long flags;
- int c1;
-
- /*
- * We must delay after the interrupt, or the controller gets confused
- * and never does give us good status. Fortunately, we don't do this
- * often.
- */
- udelay(20);
- spin_lock_irqsave(&cam->dev_lock, flags);
- c1 = cafe_reg_read(cam, REG_TWSIC1);
- spin_unlock_irqrestore(&cam->dev_lock, flags);
- return (c1 & (TWSIC1_WSTAT|TWSIC1_ERROR)) != TWSIC1_WSTAT;
-}
-
-static int cafe_smbus_write_data(struct cafe_camera *cam,
- u16 addr, u8 command, u8 value)
-{
- unsigned int rval;
- unsigned long flags;
-
- spin_lock_irqsave(&cam->dev_lock, flags);
- rval = TWSIC0_EN | ((addr << TWSIC0_SID_SHIFT) & TWSIC0_SID);
- rval |= TWSIC0_OVMAGIC; /* Make OV sensors work */
- /*
- * Marvell sez set clkdiv to all 1's for now.
- */
- rval |= TWSIC0_CLKDIV;
- cafe_reg_write(cam, REG_TWSIC0, rval);
- (void) cafe_reg_read(cam, REG_TWSIC1); /* force write */
- rval = value | ((command << TWSIC1_ADDR_SHIFT) & TWSIC1_ADDR);
- cafe_reg_write(cam, REG_TWSIC1, rval);
- spin_unlock_irqrestore(&cam->dev_lock, flags);
-
- /* Unfortunately, reading TWSIC1 too soon after sending a command
- * causes the device to die.
- * Use a busy-wait because we often send a large quantity of small
- * commands at-once; using msleep() would cause a lot of context
- * switches which take longer than 2ms, resulting in a noticeable
- * boot-time and capture-start delays.
- */
- mdelay(2);
-
- /*
- * Another sad fact is that sometimes, commands silently complete but
- * cafe_smbus_write_done() never becomes aware of this.
- * This happens at random and appears to possible occur with any
- * command.
- * We don't understand why this is. We work around this issue
- * with the timeout in the wait below, assuming that all commands
- * complete within the timeout.
- */
- wait_event_timeout(cam->smbus_wait, cafe_smbus_write_done(cam),
- CAFE_SMBUS_TIMEOUT);
-
- spin_lock_irqsave(&cam->dev_lock, flags);
- rval = cafe_reg_read(cam, REG_TWSIC1);
- spin_unlock_irqrestore(&cam->dev_lock, flags);
-
- if (rval & TWSIC1_WSTAT) {
- cam_err(cam, "SMBUS write (%02x/%02x/%02x) timed out\n", addr,
- command, value);
- return -EIO;
- }
- if (rval & TWSIC1_ERROR) {
- cam_err(cam, "SMBUS write (%02x/%02x/%02x) error\n", addr,
- command, value);
- return -EIO;
- }
- return 0;
-}
-
-
-
-static int cafe_smbus_read_done(struct cafe_camera *cam)
-{
- unsigned long flags;
- int c1;
-
- /*
- * We must delay after the interrupt, or the controller gets confused
- * and never does give us good status. Fortunately, we don't do this
- * often.
- */
- udelay(20);
- spin_lock_irqsave(&cam->dev_lock, flags);
- c1 = cafe_reg_read(cam, REG_TWSIC1);
- spin_unlock_irqrestore(&cam->dev_lock, flags);
- return c1 & (TWSIC1_RVALID|TWSIC1_ERROR);
-}
-
-
-
-static int cafe_smbus_read_data(struct cafe_camera *cam,
- u16 addr, u8 command, u8 *value)
-{
- unsigned int rval;
- unsigned long flags;
-
- spin_lock_irqsave(&cam->dev_lock, flags);
- rval = TWSIC0_EN | ((addr << TWSIC0_SID_SHIFT) & TWSIC0_SID);
- rval |= TWSIC0_OVMAGIC; /* Make OV sensors work */
- /*
- * Marvel sez set clkdiv to all 1's for now.
- */
- rval |= TWSIC0_CLKDIV;
- cafe_reg_write(cam, REG_TWSIC0, rval);
- (void) cafe_reg_read(cam, REG_TWSIC1); /* force write */
- rval = TWSIC1_READ | ((command << TWSIC1_ADDR_SHIFT) & TWSIC1_ADDR);
- cafe_reg_write(cam, REG_TWSIC1, rval);
- spin_unlock_irqrestore(&cam->dev_lock, flags);
-
- wait_event_timeout(cam->smbus_wait,
- cafe_smbus_read_done(cam), CAFE_SMBUS_TIMEOUT);
- spin_lock_irqsave(&cam->dev_lock, flags);
- rval = cafe_reg_read(cam, REG_TWSIC1);
- spin_unlock_irqrestore(&cam->dev_lock, flags);
-
- if (rval & TWSIC1_ERROR) {
- cam_err(cam, "SMBUS read (%02x/%02x) error\n", addr, command);
- return -EIO;
- }
- if (! (rval & TWSIC1_RVALID)) {
- cam_err(cam, "SMBUS read (%02x/%02x) timed out\n", addr,
- command);
- return -EIO;
- }
- *value = rval & 0xff;
- return 0;
-}
-
-/*
- * Perform a transfer over SMBUS. This thing is called under
- * the i2c bus lock, so we shouldn't race with ourselves...
- */
-static int cafe_smbus_xfer(struct i2c_adapter *adapter, u16 addr,
- unsigned short flags, char rw, u8 command,
- int size, union i2c_smbus_data *data)
-{
- struct v4l2_device *v4l2_dev = i2c_get_adapdata(adapter);
- struct cafe_camera *cam = to_cam(v4l2_dev);
- int ret = -EINVAL;
-
- /*
- * This interface would appear to only do byte data ops. OK
- * it can do word too, but the cam chip has no use for that.
- */
- if (size != I2C_SMBUS_BYTE_DATA) {
- cam_err(cam, "funky xfer size %d\n", size);
- return -EINVAL;
- }
-
- if (rw == I2C_SMBUS_WRITE)
- ret = cafe_smbus_write_data(cam, addr, command, data->byte);
- else if (rw == I2C_SMBUS_READ)
- ret = cafe_smbus_read_data(cam, addr, command, &data->byte);
- return ret;
-}
-
-
-static void cafe_smbus_enable_irq(struct cafe_camera *cam)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&cam->dev_lock, flags);
- cafe_reg_set_bit(cam, REG_IRQMASK, TWSIIRQS);
- spin_unlock_irqrestore(&cam->dev_lock, flags);
-}
-
-static u32 cafe_smbus_func(struct i2c_adapter *adapter)
-{
- return I2C_FUNC_SMBUS_READ_BYTE_DATA |
- I2C_FUNC_SMBUS_WRITE_BYTE_DATA;
-}
-
-static struct i2c_algorithm cafe_smbus_algo = {
- .smbus_xfer = cafe_smbus_xfer,
- .functionality = cafe_smbus_func
-};
-
-/* Somebody is on the bus */
-static void cafe_ctlr_stop_dma(struct cafe_camera *cam);
-static void cafe_ctlr_power_down(struct cafe_camera *cam);
-
-static int cafe_smbus_setup(struct cafe_camera *cam)
-{
- struct i2c_adapter *adap = &cam->i2c_adapter;
- int ret;
-
- cafe_smbus_enable_irq(cam);
- adap->owner = THIS_MODULE;
- adap->algo = &cafe_smbus_algo;
- strcpy(adap->name, "cafe_ccic");
- adap->dev.parent = &cam->pdev->dev;
- i2c_set_adapdata(adap, &cam->v4l2_dev);
- ret = i2c_add_adapter(adap);
- if (ret)
- printk(KERN_ERR "Unable to register cafe i2c adapter\n");
- return ret;
-}
-
-static void cafe_smbus_shutdown(struct cafe_camera *cam)
-{
- i2c_del_adapter(&cam->i2c_adapter);
-}
-
-
-/* ------------------------------------------------------------------- */
-/*
- * Deal with the controller.
- */
-
-/*
- * Do everything we think we need to have the interface operating
- * according to the desired format.
- */
-static void cafe_ctlr_dma(struct cafe_camera *cam)
-{
- /*
- * Store the first two Y buffers (we aren't supporting
- * planar formats for now, so no UV bufs). Then either
- * set the third if it exists, or tell the controller
- * to just use two.
- */
- cafe_reg_write(cam, REG_Y0BAR, cam->dma_handles[0]);
- cafe_reg_write(cam, REG_Y1BAR, cam->dma_handles[1]);
- if (cam->nbufs > 2) {
- cafe_reg_write(cam, REG_Y2BAR, cam->dma_handles[2]);
- cafe_reg_clear_bit(cam, REG_CTRL1, C1_TWOBUFS);
- }
- else
- cafe_reg_set_bit(cam, REG_CTRL1, C1_TWOBUFS);
- cafe_reg_write(cam, REG_UBAR, 0); /* 32 bits only for now */
-}
-
-static void cafe_ctlr_image(struct cafe_camera *cam)
-{
- int imgsz;
- struct v4l2_pix_format *fmt = &cam->pix_format;
-
- imgsz = ((fmt->height << IMGSZ_V_SHIFT) & IMGSZ_V_MASK) |
- (fmt->bytesperline & IMGSZ_H_MASK);
- cafe_reg_write(cam, REG_IMGSIZE, imgsz);
- cafe_reg_write(cam, REG_IMGOFFSET, 0);
- /* YPITCH just drops the last two bits */
- cafe_reg_write_mask(cam, REG_IMGPITCH, fmt->bytesperline,
- IMGP_YP_MASK);
- /*
- * Tell the controller about the image format we are using.
- */
- switch (cam->pix_format.pixelformat) {
- case V4L2_PIX_FMT_YUYV:
- cafe_reg_write_mask(cam, REG_CTRL0,
- C0_DF_YUV|C0_YUV_PACKED|C0_YUVE_YUYV,
- C0_DF_MASK);
- break;
-
- case V4L2_PIX_FMT_RGB444:
- cafe_reg_write_mask(cam, REG_CTRL0,
- C0_DF_RGB|C0_RGBF_444|C0_RGB4_XRGB,
- C0_DF_MASK);
- /* Alpha value? */
- break;
-
- case V4L2_PIX_FMT_RGB565:
- cafe_reg_write_mask(cam, REG_CTRL0,
- C0_DF_RGB|C0_RGBF_565|C0_RGB5_BGGR,
- C0_DF_MASK);
- break;
-
- default:
- cam_err(cam, "Unknown format %x\n", cam->pix_format.pixelformat);
- break;
- }
- /*
- * Make sure it knows we want to use hsync/vsync.
- */
- cafe_reg_write_mask(cam, REG_CTRL0, C0_SIF_HVSYNC,
- C0_SIFM_MASK);
-}
-
-
-/*
- * Configure the controller for operation; caller holds the
- * device mutex.
- */
-static int cafe_ctlr_configure(struct cafe_camera *cam)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&cam->dev_lock, flags);
- cafe_ctlr_dma(cam);
- cafe_ctlr_image(cam);
- cafe_set_config_needed(cam, 0);
- spin_unlock_irqrestore(&cam->dev_lock, flags);
- return 0;
-}
-
-static void cafe_ctlr_irq_enable(struct cafe_camera *cam)
-{
- /*
- * Clear any pending interrupts, since we do not
- * expect to have I/O active prior to enabling.
- */
- cafe_reg_write(cam, REG_IRQSTAT, FRAMEIRQS);
- cafe_reg_set_bit(cam, REG_IRQMASK, FRAMEIRQS);
-}
-
-static void cafe_ctlr_irq_disable(struct cafe_camera *cam)
-{
- cafe_reg_clear_bit(cam, REG_IRQMASK, FRAMEIRQS);
-}
-
-/*
- * Make the controller start grabbing images. Everything must
- * be set up before doing this.
- */
-static void cafe_ctlr_start(struct cafe_camera *cam)
-{
- /* set_bit performs a read, so no other barrier should be
- needed here */
- cafe_reg_set_bit(cam, REG_CTRL0, C0_ENABLE);
-}
-
-static void cafe_ctlr_stop(struct cafe_camera *cam)
-{
- cafe_reg_clear_bit(cam, REG_CTRL0, C0_ENABLE);
-}
-
-static void cafe_ctlr_init(struct cafe_camera *cam)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&cam->dev_lock, flags);
- /*
- * Added magic to bring up the hardware on the B-Test board
- */
- cafe_reg_write(cam, 0x3038, 0x8);
- cafe_reg_write(cam, 0x315c, 0x80008);
- /*
- * Go through the dance needed to wake the device up.
- * Note that these registers are global and shared
- * with the NAND and SD devices. Interaction between the
- * three still needs to be examined.
- */
- cafe_reg_write(cam, REG_GL_CSR, GCSR_SRS|GCSR_MRS); /* Needed? */
- cafe_reg_write(cam, REG_GL_CSR, GCSR_SRC|GCSR_MRC);
- cafe_reg_write(cam, REG_GL_CSR, GCSR_SRC|GCSR_MRS);
- /*
- * Here we must wait a bit for the controller to come around.
- */
- spin_unlock_irqrestore(&cam->dev_lock, flags);
- msleep(5);
- spin_lock_irqsave(&cam->dev_lock, flags);
-
- cafe_reg_write(cam, REG_GL_CSR, GCSR_CCIC_EN|GCSR_SRC|GCSR_MRC);
- cafe_reg_set_bit(cam, REG_GL_IMASK, GIMSK_CCIC_EN);
- /*
- * Make sure it's not powered down.
- */
- cafe_reg_clear_bit(cam, REG_CTRL1, C1_PWRDWN);
- /*
- * Turn off the enable bit. It sure should be off anyway,
- * but it's good to be sure.
- */
- cafe_reg_clear_bit(cam, REG_CTRL0, C0_ENABLE);
- /*
- * Mask all interrupts.
- */
- cafe_reg_write(cam, REG_IRQMASK, 0);
- /*
- * Clock the sensor appropriately. Controller clock should
- * be 48MHz, sensor "typical" value is half that.
- */
- cafe_reg_write_mask(cam, REG_CLKCTRL, 2, CLK_DIV_MASK);
- spin_unlock_irqrestore(&cam->dev_lock, flags);
-}
-
-
-/*
- * Stop the controller, and don't return until we're really sure that no
- * further DMA is going on.
- */
-static void cafe_ctlr_stop_dma(struct cafe_camera *cam)
-{
- unsigned long flags;
-
- /*
- * Theory: stop the camera controller (whether it is operating
- * or not). Delay briefly just in case we race with the SOF
- * interrupt, then wait until no DMA is active.
- */
- spin_lock_irqsave(&cam->dev_lock, flags);
- cafe_ctlr_stop(cam);
- spin_unlock_irqrestore(&cam->dev_lock, flags);
- mdelay(1);
- wait_event_timeout(cam->iowait,
- !test_bit(CF_DMA_ACTIVE, &cam->flags), HZ);
- if (test_bit(CF_DMA_ACTIVE, &cam->flags))
- cam_err(cam, "Timeout waiting for DMA to end\n");
- /* This would be bad news - what now? */
- spin_lock_irqsave(&cam->dev_lock, flags);
- cam->state = S_IDLE;
- cafe_ctlr_irq_disable(cam);
- spin_unlock_irqrestore(&cam->dev_lock, flags);
-}
-
-/*
- * Power up and down.
- */
-static void cafe_ctlr_power_up(struct cafe_camera *cam)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&cam->dev_lock, flags);
- cafe_reg_clear_bit(cam, REG_CTRL1, C1_PWRDWN);
- /*
- * Part one of the sensor dance: turn the global
- * GPIO signal on.
- */
- cafe_reg_write(cam, REG_GL_FCR, GFCR_GPIO_ON);
- cafe_reg_write(cam, REG_GL_GPIOR, GGPIO_OUT|GGPIO_VAL);
- /*
- * Put the sensor into operational mode (assumes OLPC-style
- * wiring). Control 0 is reset - set to 1 to operate.
- * Control 1 is power down, set to 0 to operate.
- */
- cafe_reg_write(cam, REG_GPR, GPR_C1EN|GPR_C0EN); /* pwr up, reset */
-/* mdelay(1); */ /* Marvell says 1ms will do it */
- cafe_reg_write(cam, REG_GPR, GPR_C1EN|GPR_C0EN|GPR_C0);
-/* mdelay(1); */ /* Enough? */
- spin_unlock_irqrestore(&cam->dev_lock, flags);
- msleep(5); /* Just to be sure */
-}
-
-static void cafe_ctlr_power_down(struct cafe_camera *cam)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&cam->dev_lock, flags);
- cafe_reg_write(cam, REG_GPR, GPR_C1EN|GPR_C0EN|GPR_C1);
- cafe_reg_write(cam, REG_GL_FCR, GFCR_GPIO_ON);
- cafe_reg_write(cam, REG_GL_GPIOR, GGPIO_OUT);
- cafe_reg_set_bit(cam, REG_CTRL1, C1_PWRDWN);
- spin_unlock_irqrestore(&cam->dev_lock, flags);
-}
-
-/* -------------------------------------------------------------------- */
-/*
- * Communications with the sensor.
- */
-
-static int __cafe_cam_reset(struct cafe_camera *cam)
-{
- return sensor_call(cam, core, reset, 0);
-}
-
-/*
- * We have found the sensor on the i2c. Let's try to have a
- * conversation.
- */
-static int cafe_cam_init(struct cafe_camera *cam)
-{
- struct v4l2_dbg_chip_ident chip;
- int ret;
-
- mutex_lock(&cam->s_mutex);
- if (cam->state != S_NOTREADY)
- cam_warn(cam, "Cam init with device in funky state %d",
- cam->state);
- ret = __cafe_cam_reset(cam);
- if (ret)
- goto out;
- chip.ident = V4L2_IDENT_NONE;
- chip.match.type = V4L2_CHIP_MATCH_I2C_ADDR;
- chip.match.addr = cam->sensor_addr;
- ret = sensor_call(cam, core, g_chip_ident, &chip);
- if (ret)
- goto out;
- cam->sensor_type = chip.ident;
- if (cam->sensor_type != V4L2_IDENT_OV7670) {
- cam_err(cam, "Unsupported sensor type 0x%x", cam->sensor_type);
- ret = -EINVAL;
- goto out;
- }
-/* Get/set parameters? */
- ret = 0;
- cam->state = S_IDLE;
- out:
- cafe_ctlr_power_down(cam);
- mutex_unlock(&cam->s_mutex);
- return ret;
-}
-
-/*
- * Configure the sensor to match the parameters we have. Caller should
- * hold s_mutex
- */
-static int cafe_cam_set_flip(struct cafe_camera *cam)
-{
- struct v4l2_control ctrl;
-
- memset(&ctrl, 0, sizeof(ctrl));
- ctrl.id = V4L2_CID_VFLIP;
- ctrl.value = flip;
- return sensor_call(cam, core, s_ctrl, &ctrl);
-}
-
-
-static int cafe_cam_configure(struct cafe_camera *cam)
-{
- struct v4l2_mbus_framefmt mbus_fmt;
- int ret;
-
- v4l2_fill_mbus_format(&mbus_fmt, &cam->pix_format, cam->mbus_code);
- ret = sensor_call(cam, core, init, 0);
- if (ret == 0)
- ret = sensor_call(cam, video, s_mbus_fmt, &mbus_fmt);
- /*
- * OV7670 does weird things if flip is set *before* format...
- */
- ret += cafe_cam_set_flip(cam);
- return ret;
-}
-
-/* -------------------------------------------------------------------- */
-/*
- * DMA buffer management. These functions need s_mutex held.
- */
-
-/* FIXME: this is inefficient as hell, since dma_alloc_coherent just
- * does a get_free_pages() call, and we waste a good chunk of an orderN
- * allocation. Should try to allocate the whole set in one chunk.
- */
-static int cafe_alloc_dma_bufs(struct cafe_camera *cam, int loadtime)
-{
- int i;
-
- cafe_set_config_needed(cam, 1);
- if (loadtime)
- cam->dma_buf_size = dma_buf_size;
- else
- cam->dma_buf_size = cam->pix_format.sizeimage;
- if (n_dma_bufs > 3)
- n_dma_bufs = 3;
-
- cam->nbufs = 0;
- for (i = 0; i < n_dma_bufs; i++) {
- cam->dma_bufs[i] = dma_alloc_coherent(&cam->pdev->dev,
- cam->dma_buf_size, cam->dma_handles + i,
- GFP_KERNEL);
- if (cam->dma_bufs[i] == NULL) {
- cam_warn(cam, "Failed to allocate DMA buffer\n");
- break;
- }
- /* For debug, remove eventually */
- memset(cam->dma_bufs[i], 0xcc, cam->dma_buf_size);
- (cam->nbufs)++;
- }
-
- switch (cam->nbufs) {
- case 1:
- dma_free_coherent(&cam->pdev->dev, cam->dma_buf_size,
- cam->dma_bufs[0], cam->dma_handles[0]);
- cam->nbufs = 0;
- case 0:
- cam_err(cam, "Insufficient DMA buffers, cannot operate\n");
- return -ENOMEM;
-
- case 2:
- if (n_dma_bufs > 2)
- cam_warn(cam, "Will limp along with only 2 buffers\n");
- break;
- }
- return 0;
-}
-
-static void cafe_free_dma_bufs(struct cafe_camera *cam)
-{
- int i;
-
- for (i = 0; i < cam->nbufs; i++) {
- dma_free_coherent(&cam->pdev->dev, cam->dma_buf_size,
- cam->dma_bufs[i], cam->dma_handles[i]);
- cam->dma_bufs[i] = NULL;
- }
- cam->nbufs = 0;
-}
-
-
-
-
-
-/* ----------------------------------------------------------------------- */
-/*
- * Here starts the V4L2 interface code.
- */
-
-/*
- * Read an image from the device.
- */
-static ssize_t cafe_deliver_buffer(struct cafe_camera *cam,
- char __user *buffer, size_t len, loff_t *pos)
-{
- int bufno;
- unsigned long flags;
-
- spin_lock_irqsave(&cam->dev_lock, flags);
- if (cam->next_buf < 0) {
- cam_err(cam, "deliver_buffer: No next buffer\n");
- spin_unlock_irqrestore(&cam->dev_lock, flags);
- return -EIO;
- }
- bufno = cam->next_buf;
- clear_bit(bufno, &cam->flags);
- if (++(cam->next_buf) >= cam->nbufs)
- cam->next_buf = 0;
- if (! test_bit(cam->next_buf, &cam->flags))
- cam->next_buf = -1;
- cam->specframes = 0;
- spin_unlock_irqrestore(&cam->dev_lock, flags);
-
- if (len > cam->pix_format.sizeimage)
- len = cam->pix_format.sizeimage;
- if (copy_to_user(buffer, cam->dma_bufs[bufno], len))
- return -EFAULT;
- (*pos) += len;
- return len;
-}
-
-/*
- * Get everything ready, and start grabbing frames.
- */
-static int cafe_read_setup(struct cafe_camera *cam, enum cafe_state state)
-{
- int ret;
- unsigned long flags;
-
- /*
- * Configuration. If we still don't have DMA buffers,
- * make one last, desperate attempt.
- */
- if (cam->nbufs == 0)
- if (cafe_alloc_dma_bufs(cam, 0))
- return -ENOMEM;
-
- if (cafe_needs_config(cam)) {
- cafe_cam_configure(cam);
- ret = cafe_ctlr_configure(cam);
- if (ret)
- return ret;
- }
-
- /*
- * Turn it loose.
- */
- spin_lock_irqsave(&cam->dev_lock, flags);
- cafe_reset_buffers(cam);
- cafe_ctlr_irq_enable(cam);
- cam->state = state;
- cafe_ctlr_start(cam);
- spin_unlock_irqrestore(&cam->dev_lock, flags);
- return 0;
-}
-
-
-static ssize_t cafe_v4l_read(struct file *filp,
- char __user *buffer, size_t len, loff_t *pos)
-{
- struct cafe_camera *cam = filp->private_data;
- int ret = 0;
-
- /*
- * Perhaps we're in speculative read mode and already
- * have data?
- */
- mutex_lock(&cam->s_mutex);
- if (cam->state == S_SPECREAD) {
- if (cam->next_buf >= 0) {
- ret = cafe_deliver_buffer(cam, buffer, len, pos);
- if (ret != 0)
- goto out_unlock;
- }
- } else if (cam->state == S_FLAKED || cam->state == S_NOTREADY) {
- ret = -EIO;
- goto out_unlock;
- } else if (cam->state != S_IDLE) {
- ret = -EBUSY;
- goto out_unlock;
- }
-
- /*
- * v4l2: multiple processes can open the device, but only
- * one gets to grab data from it.
- */
- if (cam->owner && cam->owner != filp) {
- ret = -EBUSY;
- goto out_unlock;
- }
- cam->owner = filp;
-
- /*
- * Do setup if need be.
- */
- if (cam->state != S_SPECREAD) {
- ret = cafe_read_setup(cam, S_SINGLEREAD);
- if (ret)
- goto out_unlock;
- }
- /*
- * Wait for something to happen. This should probably
- * be interruptible (FIXME).
- */
- wait_event_timeout(cam->iowait, cam->next_buf >= 0, HZ);
- if (cam->next_buf < 0) {
- cam_err(cam, "read() operation timed out\n");
- cafe_ctlr_stop_dma(cam);
- ret = -EIO;
- goto out_unlock;
- }
- /*
- * Give them their data and we should be done.
- */
- ret = cafe_deliver_buffer(cam, buffer, len, pos);
-
- out_unlock:
- mutex_unlock(&cam->s_mutex);
- return ret;
-}
-
-
-
-
-
-
-
-
-/*
- * Streaming I/O support.
- */
-
-
-
-static int cafe_vidioc_streamon(struct file *filp, void *priv,
- enum v4l2_buf_type type)
-{
- struct cafe_camera *cam = filp->private_data;
- int ret = -EINVAL;
-
- if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
- goto out;
- mutex_lock(&cam->s_mutex);
- if (cam->state != S_IDLE || cam->n_sbufs == 0)
- goto out_unlock;
-
- cam->sequence = 0;
- ret = cafe_read_setup(cam, S_STREAMING);
-
- out_unlock:
- mutex_unlock(&cam->s_mutex);
- out:
- return ret;
-}
-
-
-static int cafe_vidioc_streamoff(struct file *filp, void *priv,
- enum v4l2_buf_type type)
-{
- struct cafe_camera *cam = filp->private_data;
- int ret = -EINVAL;
-
- if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
- goto out;
- mutex_lock(&cam->s_mutex);
- if (cam->state != S_STREAMING)
- goto out_unlock;
-
- cafe_ctlr_stop_dma(cam);
- ret = 0;
-
- out_unlock:
- mutex_unlock(&cam->s_mutex);
- out:
- return ret;
-}
-
-
-
-static int cafe_setup_siobuf(struct cafe_camera *cam, int index)
-{
- struct cafe_sio_buffer *buf = cam->sb_bufs + index;
-
- INIT_LIST_HEAD(&buf->list);
- buf->v4lbuf.length = PAGE_ALIGN(cam->pix_format.sizeimage);
- buf->buffer = vmalloc_user(buf->v4lbuf.length);
- if (buf->buffer == NULL)
- return -ENOMEM;
- buf->mapcount = 0;
- buf->cam = cam;
-
- buf->v4lbuf.index = index;
- buf->v4lbuf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
- buf->v4lbuf.field = V4L2_FIELD_NONE;
- buf->v4lbuf.memory = V4L2_MEMORY_MMAP;
- /*
- * Offset: must be 32-bit even on a 64-bit system. videobuf-dma-sg
- * just uses the length times the index, but the spec warns
- * against doing just that - vma merging problems. So we
- * leave a gap between each pair of buffers.
- */
- buf->v4lbuf.m.offset = 2*index*buf->v4lbuf.length;
- return 0;
-}
-
-static int cafe_free_sio_buffers(struct cafe_camera *cam)
-{
- int i;
-
- /*
- * If any buffers are mapped, we cannot free them at all.
- */
- for (i = 0; i < cam->n_sbufs; i++)
- if (cam->sb_bufs[i].mapcount > 0)
- return -EBUSY;
- /*
- * OK, let's do it.
- */
- for (i = 0; i < cam->n_sbufs; i++)
- vfree(cam->sb_bufs[i].buffer);
- cam->n_sbufs = 0;
- kfree(cam->sb_bufs);
- cam->sb_bufs = NULL;
- INIT_LIST_HEAD(&cam->sb_avail);
- INIT_LIST_HEAD(&cam->sb_full);
- return 0;
-}
-
-
-
-static int cafe_vidioc_reqbufs(struct file *filp, void *priv,
- struct v4l2_requestbuffers *req)
-{
- struct cafe_camera *cam = filp->private_data;
- int ret = 0; /* Silence warning */
-
- /*
- * Make sure it's something we can do. User pointers could be
- * implemented without great pain, but that's not been done yet.
- */
- if (req->memory != V4L2_MEMORY_MMAP)
- return -EINVAL;
- /*
- * If they ask for zero buffers, they really want us to stop streaming
- * (if it's happening) and free everything. Should we check owner?
- */
- mutex_lock(&cam->s_mutex);
- if (req->count == 0) {
- if (cam->state == S_STREAMING)
- cafe_ctlr_stop_dma(cam);
- ret = cafe_free_sio_buffers (cam);
- goto out;
- }
- /*
- * Device needs to be idle and working. We *could* try to do the
- * right thing in S_SPECREAD by shutting things down, but it
- * probably doesn't matter.
- */
- if (cam->state != S_IDLE || (cam->owner && cam->owner != filp)) {
- ret = -EBUSY;
- goto out;
- }
- cam->owner = filp;
-
- if (req->count < min_buffers)
- req->count = min_buffers;
- else if (req->count > max_buffers)
- req->count = max_buffers;
- if (cam->n_sbufs > 0) {
- ret = cafe_free_sio_buffers(cam);
- if (ret)
- goto out;
- }
-
- cam->sb_bufs = kzalloc(req->count*sizeof(struct cafe_sio_buffer),
- GFP_KERNEL);
- if (cam->sb_bufs == NULL) {
- ret = -ENOMEM;
- goto out;
- }
- for (cam->n_sbufs = 0; cam->n_sbufs < req->count; (cam->n_sbufs++)) {
- ret = cafe_setup_siobuf(cam, cam->n_sbufs);
- if (ret)
- break;
- }
-
- if (cam->n_sbufs == 0) /* no luck at all - ret already set */
- kfree(cam->sb_bufs);
- req->count = cam->n_sbufs; /* In case of partial success */
-
- out:
- mutex_unlock(&cam->s_mutex);
- return ret;
-}
-
-
-static int cafe_vidioc_querybuf(struct file *filp, void *priv,
- struct v4l2_buffer *buf)
-{
- struct cafe_camera *cam = filp->private_data;
- int ret = -EINVAL;
-
- mutex_lock(&cam->s_mutex);
- if (buf->index >= cam->n_sbufs)
- goto out;
- *buf = cam->sb_bufs[buf->index].v4lbuf;
- ret = 0;
- out:
- mutex_unlock(&cam->s_mutex);
- return ret;
-}
-
-static int cafe_vidioc_qbuf(struct file *filp, void *priv,
- struct v4l2_buffer *buf)
-{
- struct cafe_camera *cam = filp->private_data;
- struct cafe_sio_buffer *sbuf;
- int ret = -EINVAL;
- unsigned long flags;
-
- mutex_lock(&cam->s_mutex);
- if (buf->index >= cam->n_sbufs)
- goto out;
- sbuf = cam->sb_bufs + buf->index;
- if (sbuf->v4lbuf.flags & V4L2_BUF_FLAG_QUEUED) {
- ret = 0; /* Already queued?? */
- goto out;
- }
- if (sbuf->v4lbuf.flags & V4L2_BUF_FLAG_DONE) {
- /* Spec doesn't say anything, seems appropriate tho */
- ret = -EBUSY;
- goto out;
- }
- sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_QUEUED;
- spin_lock_irqsave(&cam->dev_lock, flags);
- list_add(&sbuf->list, &cam->sb_avail);
- spin_unlock_irqrestore(&cam->dev_lock, flags);
- ret = 0;
- out:
- mutex_unlock(&cam->s_mutex);
- return ret;
-}
-
-static int cafe_vidioc_dqbuf(struct file *filp, void *priv,
- struct v4l2_buffer *buf)
-{
- struct cafe_camera *cam = filp->private_data;
- struct cafe_sio_buffer *sbuf;
- int ret = -EINVAL;
- unsigned long flags;
-
- mutex_lock(&cam->s_mutex);
- if (cam->state != S_STREAMING)
- goto out_unlock;
- if (list_empty(&cam->sb_full) && filp->f_flags & O_NONBLOCK) {
- ret = -EAGAIN;
- goto out_unlock;
- }
-
- while (list_empty(&cam->sb_full) && cam->state == S_STREAMING) {
- mutex_unlock(&cam->s_mutex);
- if (wait_event_interruptible(cam->iowait,
- !list_empty(&cam->sb_full))) {
- ret = -ERESTARTSYS;
- goto out;
- }
- mutex_lock(&cam->s_mutex);
- }
-
- if (cam->state != S_STREAMING)
- ret = -EINTR;
- else {
- spin_lock_irqsave(&cam->dev_lock, flags);
- /* Should probably recheck !list_empty() here */
- sbuf = list_entry(cam->sb_full.next,
- struct cafe_sio_buffer, list);
- list_del_init(&sbuf->list);
- spin_unlock_irqrestore(&cam->dev_lock, flags);
- sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_DONE;
- *buf = sbuf->v4lbuf;
- ret = 0;
- }
-
- out_unlock:
- mutex_unlock(&cam->s_mutex);
- out:
- return ret;
-}
-
-
-
-static void cafe_v4l_vm_open(struct vm_area_struct *vma)
-{
- struct cafe_sio_buffer *sbuf = vma->vm_private_data;
- /*
- * Locking: done under mmap_sem, so we don't need to
- * go back to the camera lock here.
- */
- sbuf->mapcount++;
-}
-
-
-static void cafe_v4l_vm_close(struct vm_area_struct *vma)
-{
- struct cafe_sio_buffer *sbuf = vma->vm_private_data;
-
- mutex_lock(&sbuf->cam->s_mutex);
- sbuf->mapcount--;
- /* Docs say we should stop I/O too... */
- if (sbuf->mapcount == 0)
- sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_MAPPED;
- mutex_unlock(&sbuf->cam->s_mutex);
-}
-
-static const struct vm_operations_struct cafe_v4l_vm_ops = {
- .open = cafe_v4l_vm_open,
- .close = cafe_v4l_vm_close
-};
-
-
-static int cafe_v4l_mmap(struct file *filp, struct vm_area_struct *vma)
-{
- struct cafe_camera *cam = filp->private_data;
- unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
- int ret = -EINVAL;
- int i;
- struct cafe_sio_buffer *sbuf = NULL;
-
- if (! (vma->vm_flags & VM_WRITE) || ! (vma->vm_flags & VM_SHARED))
- return -EINVAL;
- /*
- * Find the buffer they are looking for.
- */
- mutex_lock(&cam->s_mutex);
- for (i = 0; i < cam->n_sbufs; i++)
- if (cam->sb_bufs[i].v4lbuf.m.offset == offset) {
- sbuf = cam->sb_bufs + i;
- break;
- }
- if (sbuf == NULL)
- goto out;
-
- ret = remap_vmalloc_range(vma, sbuf->buffer, 0);
- if (ret)
- goto out;
- vma->vm_flags |= VM_DONTEXPAND;
- vma->vm_private_data = sbuf;
- vma->vm_ops = &cafe_v4l_vm_ops;
- sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_MAPPED;
- cafe_v4l_vm_open(vma);
- ret = 0;
- out:
- mutex_unlock(&cam->s_mutex);
- return ret;
-}
-
-
-
-static int cafe_v4l_open(struct file *filp)
-{
- struct cafe_camera *cam = video_drvdata(filp);
-
- filp->private_data = cam;
-
- mutex_lock(&cam->s_mutex);
- if (cam->users == 0) {
- cafe_ctlr_power_up(cam);
- __cafe_cam_reset(cam);
- cafe_set_config_needed(cam, 1);
- /* FIXME make sure this is complete */
- }
- (cam->users)++;
- mutex_unlock(&cam->s_mutex);
- return 0;
-}
-
-
-static int cafe_v4l_release(struct file *filp)
-{
- struct cafe_camera *cam = filp->private_data;
-
- mutex_lock(&cam->s_mutex);
- (cam->users)--;
- if (filp == cam->owner) {
- cafe_ctlr_stop_dma(cam);
- cafe_free_sio_buffers(cam);
- cam->owner = NULL;
- }
- if (cam->users == 0) {
- cafe_ctlr_power_down(cam);
- if (alloc_bufs_at_read)
- cafe_free_dma_bufs(cam);
- }
- mutex_unlock(&cam->s_mutex);
- return 0;
-}
-
-
-
-static unsigned int cafe_v4l_poll(struct file *filp,
- struct poll_table_struct *pt)
-{
- struct cafe_camera *cam = filp->private_data;
-
- poll_wait(filp, &cam->iowait, pt);
- if (cam->next_buf >= 0)
- return POLLIN | POLLRDNORM;
- return 0;
-}
-
-
-
-static int cafe_vidioc_queryctrl(struct file *filp, void *priv,
- struct v4l2_queryctrl *qc)
-{
- struct cafe_camera *cam = priv;
- int ret;
-
- mutex_lock(&cam->s_mutex);
- ret = sensor_call(cam, core, queryctrl, qc);
- mutex_unlock(&cam->s_mutex);
- return ret;
-}
-
-
-static int cafe_vidioc_g_ctrl(struct file *filp, void *priv,
- struct v4l2_control *ctrl)
-{
- struct cafe_camera *cam = priv;
- int ret;
-
- mutex_lock(&cam->s_mutex);
- ret = sensor_call(cam, core, g_ctrl, ctrl);
- mutex_unlock(&cam->s_mutex);
- return ret;
-}
-
-
-static int cafe_vidioc_s_ctrl(struct file *filp, void *priv,
- struct v4l2_control *ctrl)
-{
- struct cafe_camera *cam = priv;
- int ret;
-
- mutex_lock(&cam->s_mutex);
- ret = sensor_call(cam, core, s_ctrl, ctrl);
- mutex_unlock(&cam->s_mutex);
- return ret;
-}
-
-
-
-
-
-static int cafe_vidioc_querycap(struct file *file, void *priv,
- struct v4l2_capability *cap)
-{
- strcpy(cap->driver, "cafe_ccic");
- strcpy(cap->card, "cafe_ccic");
- cap->version = CAFE_VERSION;
- cap->capabilities = V4L2_CAP_VIDEO_CAPTURE |
- V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;
- return 0;
-}
-
-
-/*
- * The default format we use until somebody says otherwise.
- */
-static const struct v4l2_pix_format cafe_def_pix_format = {
- .width = VGA_WIDTH,
- .height = VGA_HEIGHT,
- .pixelformat = V4L2_PIX_FMT_YUYV,
- .field = V4L2_FIELD_NONE,
- .bytesperline = VGA_WIDTH*2,
- .sizeimage = VGA_WIDTH*VGA_HEIGHT*2,
-};
-
-static const enum v4l2_mbus_pixelcode cafe_def_mbus_code =
- V4L2_MBUS_FMT_YUYV8_2X8;
-
-static int cafe_vidioc_enum_fmt_vid_cap(struct file *filp,
- void *priv, struct v4l2_fmtdesc *fmt)
-{
- if (fmt->index >= N_CAFE_FMTS)
- return -EINVAL;
- strlcpy(fmt->description, cafe_formats[fmt->index].desc,
- sizeof(fmt->description));
- fmt->pixelformat = cafe_formats[fmt->index].pixelformat;
- return 0;
-}
-
-static int cafe_vidioc_try_fmt_vid_cap(struct file *filp, void *priv,
- struct v4l2_format *fmt)
-{
- struct cafe_camera *cam = priv;
- struct cafe_format_struct *f;
- struct v4l2_pix_format *pix = &fmt->fmt.pix;
- struct v4l2_mbus_framefmt mbus_fmt;
- int ret;
-
- f = cafe_find_format(pix->pixelformat);
- pix->pixelformat = f->pixelformat;
- v4l2_fill_mbus_format(&mbus_fmt, pix, f->mbus_code);
- mutex_lock(&cam->s_mutex);
- ret = sensor_call(cam, video, try_mbus_fmt, &mbus_fmt);
- mutex_unlock(&cam->s_mutex);
- v4l2_fill_pix_format(pix, &mbus_fmt);
- pix->bytesperline = pix->width * f->bpp;
- pix->sizeimage = pix->height * pix->bytesperline;
- return ret;
-}
-
-static int cafe_vidioc_s_fmt_vid_cap(struct file *filp, void *priv,
- struct v4l2_format *fmt)
-{
- struct cafe_camera *cam = priv;
- struct cafe_format_struct *f;
- int ret;
-
- /*
- * Can't do anything if the device is not idle
- * Also can't if there are streaming buffers in place.
- */
- if (cam->state != S_IDLE || cam->n_sbufs > 0)
- return -EBUSY;
-
- f = cafe_find_format(fmt->fmt.pix.pixelformat);
-
- /*
- * See if the formatting works in principle.
- */
- ret = cafe_vidioc_try_fmt_vid_cap(filp, priv, fmt);
- if (ret)
- return ret;
- /*
- * Now we start to change things for real, so let's do it
- * under lock.
- */
- mutex_lock(&cam->s_mutex);
- cam->pix_format = fmt->fmt.pix;
- cam->mbus_code = f->mbus_code;
-
- /*
- * Make sure we have appropriate DMA buffers.
- */
- ret = -ENOMEM;
- if (cam->nbufs > 0 && cam->dma_buf_size < cam->pix_format.sizeimage)
- cafe_free_dma_bufs(cam);
- if (cam->nbufs == 0) {
- if (cafe_alloc_dma_bufs(cam, 0))
- goto out;
- }
- /*
- * It looks like this might work, so let's program the sensor.
- */
- ret = cafe_cam_configure(cam);
- if (! ret)
- ret = cafe_ctlr_configure(cam);
- out:
- mutex_unlock(&cam->s_mutex);
- return ret;
-}
-
-/*
- * Return our stored notion of how the camera is/should be configured.
- * The V4l2 spec wants us to be smarter, and actually get this from
- * the camera (and not mess with it at open time). Someday.
- */
-static int cafe_vidioc_g_fmt_vid_cap(struct file *filp, void *priv,
- struct v4l2_format *f)
-{
- struct cafe_camera *cam = priv;
-
- f->fmt.pix = cam->pix_format;
- return 0;
-}
-
-/*
- * We only have one input - the sensor - so minimize the nonsense here.
- */
-static int cafe_vidioc_enum_input(struct file *filp, void *priv,
- struct v4l2_input *input)
-{
- if (input->index != 0)
- return -EINVAL;
-
- input->type = V4L2_INPUT_TYPE_CAMERA;
- input->std = V4L2_STD_ALL; /* Not sure what should go here */
- strcpy(input->name, "Camera");
- return 0;
-}
-
-static int cafe_vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
-{
- *i = 0;
- return 0;
-}
-
-static int cafe_vidioc_s_input(struct file *filp, void *priv, unsigned int i)
-{
- if (i != 0)
- return -EINVAL;
- return 0;
-}
-
-/* from vivi.c */
-static int cafe_vidioc_s_std(struct file *filp, void *priv, v4l2_std_id *a)
-{
- return 0;
-}
-
-/*
- * G/S_PARM. Most of this is done by the sensor, but we are
- * the level which controls the number of read buffers.
- */
-static int cafe_vidioc_g_parm(struct file *filp, void *priv,
- struct v4l2_streamparm *parms)
-{
- struct cafe_camera *cam = priv;
- int ret;
-
- mutex_lock(&cam->s_mutex);
- ret = sensor_call(cam, video, g_parm, parms);
- mutex_unlock(&cam->s_mutex);
- parms->parm.capture.readbuffers = n_dma_bufs;
- return ret;
-}
-
-static int cafe_vidioc_s_parm(struct file *filp, void *priv,
- struct v4l2_streamparm *parms)
-{
- struct cafe_camera *cam = priv;
- int ret;
-
- mutex_lock(&cam->s_mutex);
- ret = sensor_call(cam, video, s_parm, parms);
- mutex_unlock(&cam->s_mutex);
- parms->parm.capture.readbuffers = n_dma_bufs;
- return ret;
-}
-
-static int cafe_vidioc_g_chip_ident(struct file *file, void *priv,
- struct v4l2_dbg_chip_ident *chip)
-{
- struct cafe_camera *cam = priv;
-
- chip->ident = V4L2_IDENT_NONE;
- chip->revision = 0;
- if (v4l2_chip_match_host(&chip->match)) {
- chip->ident = V4L2_IDENT_CAFE;
- return 0;
- }
- return sensor_call(cam, core, g_chip_ident, chip);
-}
-
-static int cafe_vidioc_enum_framesizes(struct file *filp, void *priv,
- struct v4l2_frmsizeenum *sizes)
-{
- struct cafe_camera *cam = priv;
- int ret;
-
- mutex_lock(&cam->s_mutex);
- ret = sensor_call(cam, video, enum_framesizes, sizes);
- mutex_unlock(&cam->s_mutex);
- return ret;
-}
-
-static int cafe_vidioc_enum_frameintervals(struct file *filp, void *priv,
- struct v4l2_frmivalenum *interval)
-{
- struct cafe_camera *cam = priv;
- int ret;
-
- mutex_lock(&cam->s_mutex);
- ret = sensor_call(cam, video, enum_frameintervals, interval);
- mutex_unlock(&cam->s_mutex);
- return ret;
-}
-
-#ifdef CONFIG_VIDEO_ADV_DEBUG
-static int cafe_vidioc_g_register(struct file *file, void *priv,
- struct v4l2_dbg_register *reg)
-{
- struct cafe_camera *cam = priv;
-
- if (v4l2_chip_match_host(®->match)) {
- reg->val = cafe_reg_read(cam, reg->reg);
- reg->size = 4;
- return 0;
- }
- return sensor_call(cam, core, g_register, reg);
-}
-
-static int cafe_vidioc_s_register(struct file *file, void *priv,
- struct v4l2_dbg_register *reg)
-{
- struct cafe_camera *cam = priv;
-
- if (v4l2_chip_match_host(®->match)) {
- cafe_reg_write(cam, reg->reg, reg->val);
- return 0;
- }
- return sensor_call(cam, core, s_register, reg);
-}
-#endif
-
-/*
- * This template device holds all of those v4l2 methods; we
- * clone it for specific real devices.
- */
-
-static const struct v4l2_file_operations cafe_v4l_fops = {
- .owner = THIS_MODULE,
- .open = cafe_v4l_open,
- .release = cafe_v4l_release,
- .read = cafe_v4l_read,
- .poll = cafe_v4l_poll,
- .mmap = cafe_v4l_mmap,
- .unlocked_ioctl = video_ioctl2,
-};
-
-static const struct v4l2_ioctl_ops cafe_v4l_ioctl_ops = {
- .vidioc_querycap = cafe_vidioc_querycap,
- .vidioc_enum_fmt_vid_cap = cafe_vidioc_enum_fmt_vid_cap,
- .vidioc_try_fmt_vid_cap = cafe_vidioc_try_fmt_vid_cap,
- .vidioc_s_fmt_vid_cap = cafe_vidioc_s_fmt_vid_cap,
- .vidioc_g_fmt_vid_cap = cafe_vidioc_g_fmt_vid_cap,
- .vidioc_enum_input = cafe_vidioc_enum_input,
- .vidioc_g_input = cafe_vidioc_g_input,
- .vidioc_s_input = cafe_vidioc_s_input,
- .vidioc_s_std = cafe_vidioc_s_std,
- .vidioc_reqbufs = cafe_vidioc_reqbufs,
- .vidioc_querybuf = cafe_vidioc_querybuf,
- .vidioc_qbuf = cafe_vidioc_qbuf,
- .vidioc_dqbuf = cafe_vidioc_dqbuf,
- .vidioc_streamon = cafe_vidioc_streamon,
- .vidioc_streamoff = cafe_vidioc_streamoff,
- .vidioc_queryctrl = cafe_vidioc_queryctrl,
- .vidioc_g_ctrl = cafe_vidioc_g_ctrl,
- .vidioc_s_ctrl = cafe_vidioc_s_ctrl,
- .vidioc_g_parm = cafe_vidioc_g_parm,
- .vidioc_s_parm = cafe_vidioc_s_parm,
- .vidioc_enum_framesizes = cafe_vidioc_enum_framesizes,
- .vidioc_enum_frameintervals = cafe_vidioc_enum_frameintervals,
- .vidioc_g_chip_ident = cafe_vidioc_g_chip_ident,
-#ifdef CONFIG_VIDEO_ADV_DEBUG
- .vidioc_g_register = cafe_vidioc_g_register,
- .vidioc_s_register = cafe_vidioc_s_register,
-#endif
-};
-
-static struct video_device cafe_v4l_template = {
- .name = "cafe",
- .tvnorms = V4L2_STD_NTSC_M,
- .current_norm = V4L2_STD_NTSC_M, /* make mplayer happy */
-
- .fops = &cafe_v4l_fops,
- .ioctl_ops = &cafe_v4l_ioctl_ops,
- .release = video_device_release_empty,
-};
-
-
-/* ---------------------------------------------------------------------- */
-/*
- * Interrupt handler stuff
- */
-
-
-
-static void cafe_frame_tasklet(unsigned long data)
-{
- struct cafe_camera *cam = (struct cafe_camera *) data;
- int i;
- unsigned long flags;
- struct cafe_sio_buffer *sbuf;
-
- spin_lock_irqsave(&cam->dev_lock, flags);
- for (i = 0; i < cam->nbufs; i++) {
- int bufno = cam->next_buf;
- if (bufno < 0) { /* "will never happen" */
- cam_err(cam, "No valid bufs in tasklet!\n");
- break;
- }
- if (++(cam->next_buf) >= cam->nbufs)
- cam->next_buf = 0;
- if (! test_bit(bufno, &cam->flags))
- continue;
- if (list_empty(&cam->sb_avail))
- break; /* Leave it valid, hope for better later */
- clear_bit(bufno, &cam->flags);
- sbuf = list_entry(cam->sb_avail.next,
- struct cafe_sio_buffer, list);
- /*
- * Drop the lock during the big copy. This *should* be safe...
- */
- spin_unlock_irqrestore(&cam->dev_lock, flags);
- memcpy(sbuf->buffer, cam->dma_bufs[bufno],
- cam->pix_format.sizeimage);
- sbuf->v4lbuf.bytesused = cam->pix_format.sizeimage;
- sbuf->v4lbuf.sequence = cam->buf_seq[bufno];
- sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_QUEUED;
- sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_DONE;
- spin_lock_irqsave(&cam->dev_lock, flags);
- list_move_tail(&sbuf->list, &cam->sb_full);
- }
- if (! list_empty(&cam->sb_full))
- wake_up(&cam->iowait);
- spin_unlock_irqrestore(&cam->dev_lock, flags);
-}
-
-
-
-static void cafe_frame_complete(struct cafe_camera *cam, int frame)
-{
- /*
- * Basic frame housekeeping.
- */
- if (test_bit(frame, &cam->flags) && printk_ratelimit())
- cam_err(cam, "Frame overrun on %d, frames lost\n", frame);
- set_bit(frame, &cam->flags);
- clear_bit(CF_DMA_ACTIVE, &cam->flags);
- if (cam->next_buf < 0)
- cam->next_buf = frame;
- cam->buf_seq[frame] = ++(cam->sequence);
-
- switch (cam->state) {
- /*
- * If in single read mode, try going speculative.
- */
- case S_SINGLEREAD:
- cam->state = S_SPECREAD;
- cam->specframes = 0;
- wake_up(&cam->iowait);
- break;
-
- /*
- * If we are already doing speculative reads, and nobody is
- * reading them, just stop.
- */
- case S_SPECREAD:
- if (++(cam->specframes) >= cam->nbufs) {
- cafe_ctlr_stop(cam);
- cafe_ctlr_irq_disable(cam);
- cam->state = S_IDLE;
- }
- wake_up(&cam->iowait);
- break;
- /*
- * For the streaming case, we defer the real work to the
- * camera tasklet.
- *
- * FIXME: if the application is not consuming the buffers,
- * we should eventually put things on hold and restart in
- * vidioc_dqbuf().
- */
- case S_STREAMING:
- tasklet_schedule(&cam->s_tasklet);
- break;
-
- default:
- cam_err(cam, "Frame interrupt in non-operational state\n");
- break;
- }
-}
-
-
-
-
-static void cafe_frame_irq(struct cafe_camera *cam, unsigned int irqs)
-{
- unsigned int frame;
-
- cafe_reg_write(cam, REG_IRQSTAT, FRAMEIRQS); /* Clear'em all */
- /*
- * Handle any frame completions. There really should
- * not be more than one of these, or we have fallen
- * far behind.
- */
- for (frame = 0; frame < cam->nbufs; frame++)
- if (irqs & (IRQ_EOF0 << frame))
- cafe_frame_complete(cam, frame);
- /*
- * If a frame starts, note that we have DMA active. This
- * code assumes that we won't get multiple frame interrupts
- * at once; may want to rethink that.
- */
- if (irqs & (IRQ_SOF0 | IRQ_SOF1 | IRQ_SOF2))
- set_bit(CF_DMA_ACTIVE, &cam->flags);
-}
-
-
-
-static irqreturn_t cafe_irq(int irq, void *data)
-{
- struct cafe_camera *cam = data;
- unsigned int irqs;
-
- spin_lock(&cam->dev_lock);
- irqs = cafe_reg_read(cam, REG_IRQSTAT);
- if ((irqs & ALLIRQS) == 0) {
- spin_unlock(&cam->dev_lock);
- return IRQ_NONE;
- }
- if (irqs & FRAMEIRQS)
- cafe_frame_irq(cam, irqs);
- if (irqs & TWSIIRQS) {
- cafe_reg_write(cam, REG_IRQSTAT, TWSIIRQS);
- wake_up(&cam->smbus_wait);
- }
- spin_unlock(&cam->dev_lock);
- return IRQ_HANDLED;
-}
-
-
-/* -------------------------------------------------------------------------- */
-/*
- * PCI interface stuff.
- */
-
-static const struct dmi_system_id olpc_xo1_dmi[] = {
- {
- .matches = {
- DMI_MATCH(DMI_SYS_VENDOR, "OLPC"),
- DMI_MATCH(DMI_PRODUCT_NAME, "XO"),
- DMI_MATCH(DMI_PRODUCT_VERSION, "1"),
- },
- },
- { }
-};
-
-static int cafe_pci_probe(struct pci_dev *pdev,
- const struct pci_device_id *id)
-{
- int ret;
- struct cafe_camera *cam;
- struct ov7670_config sensor_cfg = {
- /* This controller only does SMBUS */
- .use_smbus = true,
-
- /*
- * Exclude QCIF mode, because it only captures a tiny portion
- * of the sensor FOV
- */
- .min_width = 320,
- .min_height = 240,
- };
- struct i2c_board_info ov7670_info = {
- .type = "ov7670",
- .addr = 0x42,
- .platform_data = &sensor_cfg,
- };
-
- /*
- * Start putting together one of our big camera structures.
- */
- ret = -ENOMEM;
- cam = kzalloc(sizeof(struct cafe_camera), GFP_KERNEL);
- if (cam == NULL)
- goto out;
- ret = v4l2_device_register(&pdev->dev, &cam->v4l2_dev);
- if (ret)
- goto out_free;
-
- mutex_init(&cam->s_mutex);
- spin_lock_init(&cam->dev_lock);
- cam->state = S_NOTREADY;
- cafe_set_config_needed(cam, 1);
- init_waitqueue_head(&cam->smbus_wait);
- init_waitqueue_head(&cam->iowait);
- cam->pdev = pdev;
- cam->pix_format = cafe_def_pix_format;
- cam->mbus_code = cafe_def_mbus_code;
- INIT_LIST_HEAD(&cam->dev_list);
- INIT_LIST_HEAD(&cam->sb_avail);
- INIT_LIST_HEAD(&cam->sb_full);
- tasklet_init(&cam->s_tasklet, cafe_frame_tasklet, (unsigned long) cam);
- /*
- * Get set up on the PCI bus.
- */
- ret = pci_enable_device(pdev);
- if (ret)
- goto out_unreg;
- pci_set_master(pdev);
-
- ret = -EIO;
- cam->regs = pci_iomap(pdev, 0, 0);
- if (! cam->regs) {
- printk(KERN_ERR "Unable to ioremap cafe-ccic regs\n");
- goto out_unreg;
- }
- ret = request_irq(pdev->irq, cafe_irq, IRQF_SHARED, "cafe-ccic", cam);
- if (ret)
- goto out_iounmap;
- /*
- * Initialize the controller and leave it powered up. It will
- * stay that way until the sensor driver shows up.
- */
- cafe_ctlr_init(cam);
- cafe_ctlr_power_up(cam);
- /*
- * Set up I2C/SMBUS communications. We have to drop the mutex here
- * because the sensor could attach in this call chain, leading to
- * unsightly deadlocks.
- */
- ret = cafe_smbus_setup(cam);
- if (ret)
- goto out_freeirq;
-
- /* Apply XO-1 clock speed */
- if (dmi_check_system(olpc_xo1_dmi))
- sensor_cfg.clock_speed = 45;
-
- cam->sensor_addr = ov7670_info.addr;
- cam->sensor = v4l2_i2c_new_subdev_board(&cam->v4l2_dev, &cam->i2c_adapter,
- &ov7670_info, NULL);
- if (cam->sensor == NULL) {
- ret = -ENODEV;
- goto out_smbus;
- }
-
- ret = cafe_cam_init(cam);
- if (ret)
- goto out_smbus;
-
- /*
- * Get the v4l2 setup done.
- */
- mutex_lock(&cam->s_mutex);
- cam->vdev = cafe_v4l_template;
- cam->vdev.debug = 0;
-/* cam->vdev.debug = V4L2_DEBUG_IOCTL_ARG;*/
- cam->vdev.v4l2_dev = &cam->v4l2_dev;
- ret = video_register_device(&cam->vdev, VFL_TYPE_GRABBER, -1);
- if (ret)
- goto out_unlock;
- video_set_drvdata(&cam->vdev, cam);
-
- /*
- * If so requested, try to get our DMA buffers now.
- */
- if (!alloc_bufs_at_read) {
- if (cafe_alloc_dma_bufs(cam, 1))
- cam_warn(cam, "Unable to alloc DMA buffers at load"
- " will try again later.");
- }
-
- mutex_unlock(&cam->s_mutex);
- return 0;
-
-out_unlock:
- mutex_unlock(&cam->s_mutex);
-out_smbus:
- cafe_smbus_shutdown(cam);
-out_freeirq:
- cafe_ctlr_power_down(cam);
- free_irq(pdev->irq, cam);
-out_iounmap:
- pci_iounmap(pdev, cam->regs);
-out_free:
- v4l2_device_unregister(&cam->v4l2_dev);
-out_unreg:
- kfree(cam);
-out:
- return ret;
-}
-
-
-/*
- * Shut down an initialized device
- */
-static void cafe_shutdown(struct cafe_camera *cam)
-{
-/* FIXME: Make sure we take care of everything here */
- if (cam->n_sbufs > 0)
- /* What if they are still mapped? Shouldn't be, but... */
- cafe_free_sio_buffers(cam);
- cafe_ctlr_stop_dma(cam);
- cafe_ctlr_power_down(cam);
- cafe_smbus_shutdown(cam);
- cafe_free_dma_bufs(cam);
- free_irq(cam->pdev->irq, cam);
- pci_iounmap(cam->pdev, cam->regs);
- video_unregister_device(&cam->vdev);
-}
-
-
-static void cafe_pci_remove(struct pci_dev *pdev)
-{
- struct v4l2_device *v4l2_dev = dev_get_drvdata(&pdev->dev);
- struct cafe_camera *cam = to_cam(v4l2_dev);
-
- if (cam == NULL) {
- printk(KERN_WARNING "pci_remove on unknown pdev %p\n", pdev);
- return;
- }
- mutex_lock(&cam->s_mutex);
- if (cam->users > 0)
- cam_warn(cam, "Removing a device with users!\n");
- cafe_shutdown(cam);
- v4l2_device_unregister(&cam->v4l2_dev);
- kfree(cam);
-/* No unlock - it no longer exists */
-}
-
-
-#ifdef CONFIG_PM
-/*
- * Basic power management.
- */
-static int cafe_pci_suspend(struct pci_dev *pdev, pm_message_t state)
-{
- struct v4l2_device *v4l2_dev = dev_get_drvdata(&pdev->dev);
- struct cafe_camera *cam = to_cam(v4l2_dev);
- int ret;
- enum cafe_state cstate;
-
- ret = pci_save_state(pdev);
- if (ret)
- return ret;
- cstate = cam->state; /* HACK - stop_dma sets to idle */
- cafe_ctlr_stop_dma(cam);
- cafe_ctlr_power_down(cam);
- pci_disable_device(pdev);
- cam->state = cstate;
- return 0;
-}
-
-
-static int cafe_pci_resume(struct pci_dev *pdev)
-{
- struct v4l2_device *v4l2_dev = dev_get_drvdata(&pdev->dev);
- struct cafe_camera *cam = to_cam(v4l2_dev);
- int ret = 0;
-
- pci_restore_state(pdev);
- ret = pci_enable_device(pdev);
-
- if (ret) {
- cam_warn(cam, "Unable to re-enable device on resume!\n");
- return ret;
- }
- cafe_ctlr_init(cam);
-
- mutex_lock(&cam->s_mutex);
- if (cam->users > 0) {
- cafe_ctlr_power_up(cam);
- __cafe_cam_reset(cam);
- } else {
- cafe_ctlr_power_down(cam);
- }
- mutex_unlock(&cam->s_mutex);
-
- set_bit(CF_CONFIG_NEEDED, &cam->flags);
- if (cam->state == S_SPECREAD)
- cam->state = S_IDLE; /* Don't bother restarting */
- else if (cam->state == S_SINGLEREAD || cam->state == S_STREAMING)
- ret = cafe_read_setup(cam, cam->state);
- return ret;
-}
-
-#endif /* CONFIG_PM */
-
-
-static struct pci_device_id cafe_ids[] = {
- { PCI_DEVICE(PCI_VENDOR_ID_MARVELL,
- PCI_DEVICE_ID_MARVELL_88ALP01_CCIC) },
- { 0, }
-};
-
-MODULE_DEVICE_TABLE(pci, cafe_ids);
-
-static struct pci_driver cafe_pci_driver = {
- .name = "cafe1000-ccic",
- .id_table = cafe_ids,
- .probe = cafe_pci_probe,
- .remove = cafe_pci_remove,
-#ifdef CONFIG_PM
- .suspend = cafe_pci_suspend,
- .resume = cafe_pci_resume,
-#endif
-};
-
-
-
-
-static int __init cafe_init(void)
-{
- int ret;
-
- printk(KERN_NOTICE "Marvell M88ALP01 'CAFE' Camera Controller version %d\n",
- CAFE_VERSION);
- ret = pci_register_driver(&cafe_pci_driver);
- if (ret) {
- printk(KERN_ERR "Unable to register cafe_ccic driver\n");
- goto out;
- }
- ret = 0;
-
- out:
- return ret;
-}
-
-
-static void __exit cafe_exit(void)
-{
- pci_unregister_driver(&cafe_pci_driver);
-}
-
-module_init(cafe_init);
-module_exit(cafe_exit);
--- /dev/null
+/*
+ * The Marvell camera core. This device appears in a number of settings,
+ * so it needs platform-specific support outside of the core.
+ *
+ * Copyright 2011 Jonathan Corbet corbet@lwn.net
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/dmi.h>
+#include <linux/mm.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+#include <linux/videodev2.h>
+#include <linux/slab.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-ioctl.h>
+#include <media/v4l2-chip-ident.h>
+#include <media/ov7670.h>
+#include <linux/device.h>
+#include <linux/wait.h>
+#include <linux/list.h>
+#include <linux/dma-mapping.h>
+#include <linux/delay.h>
+#include <linux/jiffies.h>
+#include <linux/vmalloc.h>
+#include <linux/uaccess.h>
+#include <linux/io.h>
+
+#include "mcam-core.h"
+
+
+/*
+ * Internal DMA buffer management. Since the controller cannot do S/G I/O,
+ * we must have physically contiguous buffers to bring frames into.
+ * These parameters control how many buffers we use, whether we
+ * allocate them at load time (better chance of success, but nails down
+ * memory) or when somebody tries to use the camera (riskier), and,
+ * for load-time allocation, how big they should be.
+ *
+ * The controller can cycle through three buffers. We could use
+ * more by flipping pointers around, but it probably makes little
+ * sense.
+ */
+
+static int alloc_bufs_at_read;
+module_param(alloc_bufs_at_read, bool, 0444);
+MODULE_PARM_DESC(alloc_bufs_at_read,
+ "Non-zero value causes DMA buffers to be allocated when the "
+ "video capture device is read, rather than at module load "
+ "time. This saves memory, but decreases the chances of "
+ "successfully getting those buffers.");
+
+static int n_dma_bufs = 3;
+module_param(n_dma_bufs, uint, 0644);
+MODULE_PARM_DESC(n_dma_bufs,
+ "The number of DMA buffers to allocate. Can be either two "
+ "(saves memory, makes timing tighter) or three.");
+
+static int dma_buf_size = VGA_WIDTH * VGA_HEIGHT * 2; /* Worst case */
+module_param(dma_buf_size, uint, 0444);
+MODULE_PARM_DESC(dma_buf_size,
+ "The size of the allocated DMA buffers. If actual operating "
+ "parameters require larger buffers, an attempt to reallocate "
+ "will be made.");
+
+static int min_buffers = 1;
+module_param(min_buffers, uint, 0644);
+MODULE_PARM_DESC(min_buffers,
+ "The minimum number of streaming I/O buffers we are willing "
+ "to work with.");
+
+static int max_buffers = 10;
+module_param(max_buffers, uint, 0644);
+MODULE_PARM_DESC(max_buffers,
+ "The maximum number of streaming I/O buffers an application "
+ "will be allowed to allocate. These buffers are big and live "
+ "in vmalloc space.");
+
+static int flip;
+module_param(flip, bool, 0444);
+MODULE_PARM_DESC(flip,
+ "If set, the sensor will be instructed to flip the image "
+ "vertically.");
+
+/*
+ * Status flags. Always manipulated with bit operations.
+ */
+#define CF_BUF0_VALID 0 /* Buffers valid - first three */
+#define CF_BUF1_VALID 1
+#define CF_BUF2_VALID 2
+#define CF_DMA_ACTIVE 3 /* A frame is incoming */
+#define CF_CONFIG_NEEDED 4 /* Must configure hardware */
+
+#define sensor_call(cam, o, f, args...) \
+ v4l2_subdev_call(cam->sensor, o, f, ##args)
+
+static struct mcam_format_struct {
+ __u8 *desc;
+ __u32 pixelformat;
+ int bpp; /* Bytes per pixel */
+ enum v4l2_mbus_pixelcode mbus_code;
+} mcam_formats[] = {
+ {
+ .desc = "YUYV 4:2:2",
+ .pixelformat = V4L2_PIX_FMT_YUYV,
+ .mbus_code = V4L2_MBUS_FMT_YUYV8_2X8,
+ .bpp = 2,
+ },
+ {
+ .desc = "RGB 444",
+ .pixelformat = V4L2_PIX_FMT_RGB444,
+ .mbus_code = V4L2_MBUS_FMT_RGB444_2X8_PADHI_LE,
+ .bpp = 2,
+ },
+ {
+ .desc = "RGB 565",
+ .pixelformat = V4L2_PIX_FMT_RGB565,
+ .mbus_code = V4L2_MBUS_FMT_RGB565_2X8_LE,
+ .bpp = 2,
+ },
+ {
+ .desc = "Raw RGB Bayer",
+ .pixelformat = V4L2_PIX_FMT_SBGGR8,
+ .mbus_code = V4L2_MBUS_FMT_SBGGR8_1X8,
+ .bpp = 1
+ },
+};
+#define N_MCAM_FMTS ARRAY_SIZE(mcam_formats)
+
+static struct mcam_format_struct *mcam_find_format(u32 pixelformat)
+{
+ unsigned i;
+
+ for (i = 0; i < N_MCAM_FMTS; i++)
+ if (mcam_formats[i].pixelformat == pixelformat)
+ return mcam_formats + i;
+ /* Not found? Then return the first format. */
+ return mcam_formats;
+}
+
+/*
+ * Start over with DMA buffers - dev_lock needed.
+ */
+static void mcam_reset_buffers(struct mcam_camera *cam)
+{
+ int i;
+
+ cam->next_buf = -1;
+ for (i = 0; i < cam->nbufs; i++)
+ clear_bit(i, &cam->flags);
+ cam->specframes = 0;
+}
+
+static inline int mcam_needs_config(struct mcam_camera *cam)
+{
+ return test_bit(CF_CONFIG_NEEDED, &cam->flags);
+}
+
+static void mcam_set_config_needed(struct mcam_camera *cam, int needed)
+{
+ if (needed)
+ set_bit(CF_CONFIG_NEEDED, &cam->flags);
+ else
+ clear_bit(CF_CONFIG_NEEDED, &cam->flags);
+}
+
+
+/*
+ * Debugging and related. FIXME these are broken
+ */
+#define cam_err(cam, fmt, arg...) \
+ dev_err((cam)->dev, fmt, ##arg);
+#define cam_warn(cam, fmt, arg...) \
+ dev_warn((cam)->dev, fmt, ##arg);
+#define cam_dbg(cam, fmt, arg...) \
+ dev_dbg((cam)->dev, fmt, ##arg);
+
+
+
+/* ------------------------------------------------------------------- */
+/*
+ * Deal with the controller.
+ */
+
+/*
+ * Do everything we think we need to have the interface operating
+ * according to the desired format.
+ */
+static void mcam_ctlr_dma(struct mcam_camera *cam)
+{
+ /*
+ * Store the first two Y buffers (we aren't supporting
+ * planar formats for now, so no UV bufs). Then either
+ * set the third if it exists, or tell the controller
+ * to just use two.
+ */
+ mcam_reg_write(cam, REG_Y0BAR, cam->dma_handles[0]);
+ mcam_reg_write(cam, REG_Y1BAR, cam->dma_handles[1]);
+ if (cam->nbufs > 2) {
+ mcam_reg_write(cam, REG_Y2BAR, cam->dma_handles[2]);
+ mcam_reg_clear_bit(cam, REG_CTRL1, C1_TWOBUFS);
+ } else
+ mcam_reg_set_bit(cam, REG_CTRL1, C1_TWOBUFS);
+ mcam_reg_write(cam, REG_UBAR, 0); /* 32 bits only for now */
+}
+
+static void mcam_ctlr_image(struct mcam_camera *cam)
+{
+ int imgsz;
+ struct v4l2_pix_format *fmt = &cam->pix_format;
+
+ imgsz = ((fmt->height << IMGSZ_V_SHIFT) & IMGSZ_V_MASK) |
+ (fmt->bytesperline & IMGSZ_H_MASK);
+ mcam_reg_write(cam, REG_IMGSIZE, imgsz);
+ mcam_reg_write(cam, REG_IMGOFFSET, 0);
+ /* YPITCH just drops the last two bits */
+ mcam_reg_write_mask(cam, REG_IMGPITCH, fmt->bytesperline,
+ IMGP_YP_MASK);
+ /*
+ * Tell the controller about the image format we are using.
+ */
+ switch (cam->pix_format.pixelformat) {
+ case V4L2_PIX_FMT_YUYV:
+ mcam_reg_write_mask(cam, REG_CTRL0,
+ C0_DF_YUV|C0_YUV_PACKED|C0_YUVE_YUYV,
+ C0_DF_MASK);
+ break;
+
+ case V4L2_PIX_FMT_RGB444:
+ mcam_reg_write_mask(cam, REG_CTRL0,
+ C0_DF_RGB|C0_RGBF_444|C0_RGB4_XRGB,
+ C0_DF_MASK);
+ /* Alpha value? */
+ break;
+
+ case V4L2_PIX_FMT_RGB565:
+ mcam_reg_write_mask(cam, REG_CTRL0,
+ C0_DF_RGB|C0_RGBF_565|C0_RGB5_BGGR,
+ C0_DF_MASK);
+ break;
+
+ default:
+ cam_err(cam, "Unknown format %x\n", cam->pix_format.pixelformat);
+ break;
+ }
+ /*
+ * Make sure it knows we want to use hsync/vsync.
+ */
+ mcam_reg_write_mask(cam, REG_CTRL0, C0_SIF_HVSYNC,
+ C0_SIFM_MASK);
+}
+
+
+/*
+ * Configure the controller for operation; caller holds the
+ * device mutex.
+ */
+static int mcam_ctlr_configure(struct mcam_camera *cam)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&cam->dev_lock, flags);
+ mcam_ctlr_dma(cam);
+ mcam_ctlr_image(cam);
+ mcam_set_config_needed(cam, 0);
+ spin_unlock_irqrestore(&cam->dev_lock, flags);
+ return 0;
+}
+
+static void mcam_ctlr_irq_enable(struct mcam_camera *cam)
+{
+ /*
+ * Clear any pending interrupts, since we do not
+ * expect to have I/O active prior to enabling.
+ */
+ mcam_reg_write(cam, REG_IRQSTAT, FRAMEIRQS);
+ mcam_reg_set_bit(cam, REG_IRQMASK, FRAMEIRQS);
+}
+
+static void mcam_ctlr_irq_disable(struct mcam_camera *cam)
+{
+ mcam_reg_clear_bit(cam, REG_IRQMASK, FRAMEIRQS);
+}
+
+/*
+ * Make the controller start grabbing images. Everything must
+ * be set up before doing this.
+ */
+static void mcam_ctlr_start(struct mcam_camera *cam)
+{
+ /* set_bit performs a read, so no other barrier should be
+ needed here */
+ mcam_reg_set_bit(cam, REG_CTRL0, C0_ENABLE);
+}
+
+static void mcam_ctlr_stop(struct mcam_camera *cam)
+{
+ mcam_reg_clear_bit(cam, REG_CTRL0, C0_ENABLE);
+}
+
+static void mcam_ctlr_init(struct mcam_camera *cam)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&cam->dev_lock, flags);
+ /*
+ * Make sure it's not powered down.
+ */
+ mcam_reg_clear_bit(cam, REG_CTRL1, C1_PWRDWN);
+ /*
+ * Turn off the enable bit. It sure should be off anyway,
+ * but it's good to be sure.
+ */
+ mcam_reg_clear_bit(cam, REG_CTRL0, C0_ENABLE);
+ /*
+ * Clock the sensor appropriately. Controller clock should
+ * be 48MHz, sensor "typical" value is half that.
+ */
+ mcam_reg_write_mask(cam, REG_CLKCTRL, 2, CLK_DIV_MASK);
+ spin_unlock_irqrestore(&cam->dev_lock, flags);
+}
+
+
+/*
+ * Stop the controller, and don't return until we're really sure that no
+ * further DMA is going on.
+ */
+static void mcam_ctlr_stop_dma(struct mcam_camera *cam)
+{
+ unsigned long flags;
+
+ /*
+ * Theory: stop the camera controller (whether it is operating
+ * or not). Delay briefly just in case we race with the SOF
+ * interrupt, then wait until no DMA is active.
+ */
+ spin_lock_irqsave(&cam->dev_lock, flags);
+ mcam_ctlr_stop(cam);
+ spin_unlock_irqrestore(&cam->dev_lock, flags);
+ mdelay(1);
+ wait_event_timeout(cam->iowait,
+ !test_bit(CF_DMA_ACTIVE, &cam->flags), HZ);
+ if (test_bit(CF_DMA_ACTIVE, &cam->flags))
+ cam_err(cam, "Timeout waiting for DMA to end\n");
+ /* This would be bad news - what now? */
+ spin_lock_irqsave(&cam->dev_lock, flags);
+ cam->state = S_IDLE;
+ mcam_ctlr_irq_disable(cam);
+ spin_unlock_irqrestore(&cam->dev_lock, flags);
+}
+
+/*
+ * Power up and down.
+ */
+static void mcam_ctlr_power_up(struct mcam_camera *cam)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&cam->dev_lock, flags);
+ mcam_reg_clear_bit(cam, REG_CTRL1, C1_PWRDWN);
+ cam->plat_power_up(cam);
+ spin_unlock_irqrestore(&cam->dev_lock, flags);
+ msleep(5); /* Just to be sure */
+}
+
+static void mcam_ctlr_power_down(struct mcam_camera *cam)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&cam->dev_lock, flags);
+ cam->plat_power_down(cam);
+ mcam_reg_set_bit(cam, REG_CTRL1, C1_PWRDWN);
+ spin_unlock_irqrestore(&cam->dev_lock, flags);
+}
+
+/* -------------------------------------------------------------------- */
+/*
+ * Communications with the sensor.
+ */
+
+static int __mcam_cam_reset(struct mcam_camera *cam)
+{
+ return sensor_call(cam, core, reset, 0);
+}
+
+/*
+ * We have found the sensor on the i2c. Let's try to have a
+ * conversation.
+ */
+static int mcam_cam_init(struct mcam_camera *cam)
+{
+ struct v4l2_dbg_chip_ident chip;
+ int ret;
+
+ mutex_lock(&cam->s_mutex);
+ if (cam->state != S_NOTREADY)
+ cam_warn(cam, "Cam init with device in funky state %d",
+ cam->state);
+ ret = __mcam_cam_reset(cam);
+ if (ret)
+ goto out;
+ chip.ident = V4L2_IDENT_NONE;
+ chip.match.type = V4L2_CHIP_MATCH_I2C_ADDR;
+ chip.match.addr = cam->sensor_addr;
+ ret = sensor_call(cam, core, g_chip_ident, &chip);
+ if (ret)
+ goto out;
+ cam->sensor_type = chip.ident;
+ if (cam->sensor_type != V4L2_IDENT_OV7670) {
+ cam_err(cam, "Unsupported sensor type 0x%x", cam->sensor_type);
+ ret = -EINVAL;
+ goto out;
+ }
+/* Get/set parameters? */
+ ret = 0;
+ cam->state = S_IDLE;
+out:
+ mcam_ctlr_power_down(cam);
+ mutex_unlock(&cam->s_mutex);
+ return ret;
+}
+
+/*
+ * Configure the sensor to match the parameters we have. Caller should
+ * hold s_mutex
+ */
+static int mcam_cam_set_flip(struct mcam_camera *cam)
+{
+ struct v4l2_control ctrl;
+
+ memset(&ctrl, 0, sizeof(ctrl));
+ ctrl.id = V4L2_CID_VFLIP;
+ ctrl.value = flip;
+ return sensor_call(cam, core, s_ctrl, &ctrl);
+}
+
+
+static int mcam_cam_configure(struct mcam_camera *cam)
+{
+ struct v4l2_mbus_framefmt mbus_fmt;
+ int ret;
+
+ v4l2_fill_mbus_format(&mbus_fmt, &cam->pix_format, cam->mbus_code);
+ ret = sensor_call(cam, core, init, 0);
+ if (ret == 0)
+ ret = sensor_call(cam, video, s_mbus_fmt, &mbus_fmt);
+ /*
+ * OV7670 does weird things if flip is set *before* format...
+ */
+ ret += mcam_cam_set_flip(cam);
+ return ret;
+}
+
+/* -------------------------------------------------------------------- */
+/*
+ * DMA buffer management. These functions need s_mutex held.
+ */
+
+/* FIXME: this is inefficient as hell, since dma_alloc_coherent just
+ * does a get_free_pages() call, and we waste a good chunk of an orderN
+ * allocation. Should try to allocate the whole set in one chunk.
+ */
+static int mcam_alloc_dma_bufs(struct mcam_camera *cam, int loadtime)
+{
+ int i;
+
+ mcam_set_config_needed(cam, 1);
+ if (loadtime)
+ cam->dma_buf_size = dma_buf_size;
+ else
+ cam->dma_buf_size = cam->pix_format.sizeimage;
+ if (n_dma_bufs > 3)
+ n_dma_bufs = 3;
+
+ cam->nbufs = 0;
+ for (i = 0; i < n_dma_bufs; i++) {
+ cam->dma_bufs[i] = dma_alloc_coherent(cam->dev,
+ cam->dma_buf_size, cam->dma_handles + i,
+ GFP_KERNEL);
+ if (cam->dma_bufs[i] == NULL) {
+ cam_warn(cam, "Failed to allocate DMA buffer\n");
+ break;
+ }
+ /* For debug, remove eventually */
+ memset(cam->dma_bufs[i], 0xcc, cam->dma_buf_size);
+ (cam->nbufs)++;
+ }
+
+ switch (cam->nbufs) {
+ case 1:
+ dma_free_coherent(cam->dev, cam->dma_buf_size,
+ cam->dma_bufs[0], cam->dma_handles[0]);
+ cam->nbufs = 0;
+ case 0:
+ cam_err(cam, "Insufficient DMA buffers, cannot operate\n");
+ return -ENOMEM;
+
+ case 2:
+ if (n_dma_bufs > 2)
+ cam_warn(cam, "Will limp along with only 2 buffers\n");
+ break;
+ }
+ return 0;
+}
+
+static void mcam_free_dma_bufs(struct mcam_camera *cam)
+{
+ int i;
+
+ for (i = 0; i < cam->nbufs; i++) {
+ dma_free_coherent(cam->dev, cam->dma_buf_size,
+ cam->dma_bufs[i], cam->dma_handles[i]);
+ cam->dma_bufs[i] = NULL;
+ }
+ cam->nbufs = 0;
+}
+
+
+
+
+
+/* ----------------------------------------------------------------------- */
+/*
+ * Here starts the V4L2 interface code.
+ */
+
+/*
+ * Read an image from the device.
+ */
+static ssize_t mcam_deliver_buffer(struct mcam_camera *cam,
+ char __user *buffer, size_t len, loff_t *pos)
+{
+ int bufno;
+ unsigned long flags;
+
+ spin_lock_irqsave(&cam->dev_lock, flags);
+ if (cam->next_buf < 0) {
+ cam_err(cam, "deliver_buffer: No next buffer\n");
+ spin_unlock_irqrestore(&cam->dev_lock, flags);
+ return -EIO;
+ }
+ bufno = cam->next_buf;
+ clear_bit(bufno, &cam->flags);
+ if (++(cam->next_buf) >= cam->nbufs)
+ cam->next_buf = 0;
+ if (!test_bit(cam->next_buf, &cam->flags))
+ cam->next_buf = -1;
+ cam->specframes = 0;
+ spin_unlock_irqrestore(&cam->dev_lock, flags);
+
+ if (len > cam->pix_format.sizeimage)
+ len = cam->pix_format.sizeimage;
+ if (copy_to_user(buffer, cam->dma_bufs[bufno], len))
+ return -EFAULT;
+ (*pos) += len;
+ return len;
+}
+
+/*
+ * Get everything ready, and start grabbing frames.
+ */
+static int mcam_read_setup(struct mcam_camera *cam, enum mcam_state state)
+{
+ int ret;
+ unsigned long flags;
+
+ /*
+ * Configuration. If we still don't have DMA buffers,
+ * make one last, desperate attempt.
+ */
+ if (cam->nbufs == 0)
+ if (mcam_alloc_dma_bufs(cam, 0))
+ return -ENOMEM;
+
+ if (mcam_needs_config(cam)) {
+ mcam_cam_configure(cam);
+ ret = mcam_ctlr_configure(cam);
+ if (ret)
+ return ret;
+ }
+
+ /*
+ * Turn it loose.
+ */
+ spin_lock_irqsave(&cam->dev_lock, flags);
+ mcam_reset_buffers(cam);
+ mcam_ctlr_irq_enable(cam);
+ cam->state = state;
+ mcam_ctlr_start(cam);
+ spin_unlock_irqrestore(&cam->dev_lock, flags);
+ return 0;
+}
+
+
+static ssize_t mcam_v4l_read(struct file *filp,
+ char __user *buffer, size_t len, loff_t *pos)
+{
+ struct mcam_camera *cam = filp->private_data;
+ int ret = 0;
+
+ /*
+ * Perhaps we're in speculative read mode and already
+ * have data?
+ */
+ mutex_lock(&cam->s_mutex);
+ if (cam->state == S_SPECREAD) {
+ if (cam->next_buf >= 0) {
+ ret = mcam_deliver_buffer(cam, buffer, len, pos);
+ if (ret != 0)
+ goto out_unlock;
+ }
+ } else if (cam->state == S_FLAKED || cam->state == S_NOTREADY) {
+ ret = -EIO;
+ goto out_unlock;
+ } else if (cam->state != S_IDLE) {
+ ret = -EBUSY;
+ goto out_unlock;
+ }
+
+ /*
+ * v4l2: multiple processes can open the device, but only
+ * one gets to grab data from it.
+ */
+ if (cam->owner && cam->owner != filp) {
+ ret = -EBUSY;
+ goto out_unlock;
+ }
+ cam->owner = filp;
+
+ /*
+ * Do setup if need be.
+ */
+ if (cam->state != S_SPECREAD) {
+ ret = mcam_read_setup(cam, S_SINGLEREAD);
+ if (ret)
+ goto out_unlock;
+ }
+ /*
+ * Wait for something to happen. This should probably
+ * be interruptible (FIXME).
+ */
+ wait_event_timeout(cam->iowait, cam->next_buf >= 0, HZ);
+ if (cam->next_buf < 0) {
+ cam_err(cam, "read() operation timed out\n");
+ mcam_ctlr_stop_dma(cam);
+ ret = -EIO;
+ goto out_unlock;
+ }
+ /*
+ * Give them their data and we should be done.
+ */
+ ret = mcam_deliver_buffer(cam, buffer, len, pos);
+
+out_unlock:
+ mutex_unlock(&cam->s_mutex);
+ return ret;
+}
+
+
+
+
+
+
+
+
+/*
+ * Streaming I/O support.
+ */
+
+
+
+static int mcam_vidioc_streamon(struct file *filp, void *priv,
+ enum v4l2_buf_type type)
+{
+ struct mcam_camera *cam = filp->private_data;
+ int ret = -EINVAL;
+
+ if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+ goto out;
+ mutex_lock(&cam->s_mutex);
+ if (cam->state != S_IDLE || cam->n_sbufs == 0)
+ goto out_unlock;
+
+ cam->sequence = 0;
+ ret = mcam_read_setup(cam, S_STREAMING);
+
+out_unlock:
+ mutex_unlock(&cam->s_mutex);
+out:
+ return ret;
+}
+
+
+static int mcam_vidioc_streamoff(struct file *filp, void *priv,
+ enum v4l2_buf_type type)
+{
+ struct mcam_camera *cam = filp->private_data;
+ int ret = -EINVAL;
+
+ if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+ goto out;
+ mutex_lock(&cam->s_mutex);
+ if (cam->state != S_STREAMING)
+ goto out_unlock;
+
+ mcam_ctlr_stop_dma(cam);
+ ret = 0;
+
+out_unlock:
+ mutex_unlock(&cam->s_mutex);
+out:
+ return ret;
+}
+
+
+
+static int mcam_setup_siobuf(struct mcam_camera *cam, int index)
+{
+ struct mcam_sio_buffer *buf = cam->sb_bufs + index;
+
+ INIT_LIST_HEAD(&buf->list);
+ buf->v4lbuf.length = PAGE_ALIGN(cam->pix_format.sizeimage);
+ buf->buffer = vmalloc_user(buf->v4lbuf.length);
+ if (buf->buffer == NULL)
+ return -ENOMEM;
+ buf->mapcount = 0;
+ buf->cam = cam;
+
+ buf->v4lbuf.index = index;
+ buf->v4lbuf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+ buf->v4lbuf.field = V4L2_FIELD_NONE;
+ buf->v4lbuf.memory = V4L2_MEMORY_MMAP;
+ /*
+ * Offset: must be 32-bit even on a 64-bit system. videobuf-dma-sg
+ * just uses the length times the index, but the spec warns
+ * against doing just that - vma merging problems. So we
+ * leave a gap between each pair of buffers.
+ */
+ buf->v4lbuf.m.offset = 2*index*buf->v4lbuf.length;
+ return 0;
+}
+
+static int mcam_free_sio_buffers(struct mcam_camera *cam)
+{
+ int i;
+
+ /*
+ * If any buffers are mapped, we cannot free them at all.
+ */
+ for (i = 0; i < cam->n_sbufs; i++)
+ if (cam->sb_bufs[i].mapcount > 0)
+ return -EBUSY;
+ /*
+ * OK, let's do it.
+ */
+ for (i = 0; i < cam->n_sbufs; i++)
+ vfree(cam->sb_bufs[i].buffer);
+ cam->n_sbufs = 0;
+ kfree(cam->sb_bufs);
+ cam->sb_bufs = NULL;
+ INIT_LIST_HEAD(&cam->sb_avail);
+ INIT_LIST_HEAD(&cam->sb_full);
+ return 0;
+}
+
+
+
+static int mcam_vidioc_reqbufs(struct file *filp, void *priv,
+ struct v4l2_requestbuffers *req)
+{
+ struct mcam_camera *cam = filp->private_data;
+ int ret = 0; /* Silence warning */
+
+ /*
+ * Make sure it's something we can do. User pointers could be
+ * implemented without great pain, but that's not been done yet.
+ */
+ if (req->memory != V4L2_MEMORY_MMAP)
+ return -EINVAL;
+ /*
+ * If they ask for zero buffers, they really want us to stop streaming
+ * (if it's happening) and free everything. Should we check owner?
+ */
+ mutex_lock(&cam->s_mutex);
+ if (req->count == 0) {
+ if (cam->state == S_STREAMING)
+ mcam_ctlr_stop_dma(cam);
+ ret = mcam_free_sio_buffers(cam);
+ goto out;
+ }
+ /*
+ * Device needs to be idle and working. We *could* try to do the
+ * right thing in S_SPECREAD by shutting things down, but it
+ * probably doesn't matter.
+ */
+ if (cam->state != S_IDLE || (cam->owner && cam->owner != filp)) {
+ ret = -EBUSY;
+ goto out;
+ }
+ cam->owner = filp;
+
+ if (req->count < min_buffers)
+ req->count = min_buffers;
+ else if (req->count > max_buffers)
+ req->count = max_buffers;
+ if (cam->n_sbufs > 0) {
+ ret = mcam_free_sio_buffers(cam);
+ if (ret)
+ goto out;
+ }
+
+ cam->sb_bufs = kzalloc(req->count*sizeof(struct mcam_sio_buffer),
+ GFP_KERNEL);
+ if (cam->sb_bufs == NULL) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ for (cam->n_sbufs = 0; cam->n_sbufs < req->count; (cam->n_sbufs++)) {
+ ret = mcam_setup_siobuf(cam, cam->n_sbufs);
+ if (ret)
+ break;
+ }
+
+ if (cam->n_sbufs == 0) /* no luck at all - ret already set */
+ kfree(cam->sb_bufs);
+ req->count = cam->n_sbufs; /* In case of partial success */
+
+out:
+ mutex_unlock(&cam->s_mutex);
+ return ret;
+}
+
+
+static int mcam_vidioc_querybuf(struct file *filp, void *priv,
+ struct v4l2_buffer *buf)
+{
+ struct mcam_camera *cam = filp->private_data;
+ int ret = -EINVAL;
+
+ mutex_lock(&cam->s_mutex);
+ if (buf->index >= cam->n_sbufs)
+ goto out;
+ *buf = cam->sb_bufs[buf->index].v4lbuf;
+ ret = 0;
+out:
+ mutex_unlock(&cam->s_mutex);
+ return ret;
+}
+
+static int mcam_vidioc_qbuf(struct file *filp, void *priv,
+ struct v4l2_buffer *buf)
+{
+ struct mcam_camera *cam = filp->private_data;
+ struct mcam_sio_buffer *sbuf;
+ int ret = -EINVAL;
+ unsigned long flags;
+
+ mutex_lock(&cam->s_mutex);
+ if (buf->index >= cam->n_sbufs)
+ goto out;
+ sbuf = cam->sb_bufs + buf->index;
+ if (sbuf->v4lbuf.flags & V4L2_BUF_FLAG_QUEUED) {
+ ret = 0; /* Already queued?? */
+ goto out;
+ }
+ if (sbuf->v4lbuf.flags & V4L2_BUF_FLAG_DONE) {
+ /* Spec doesn't say anything, seems appropriate tho */
+ ret = -EBUSY;
+ goto out;
+ }
+ sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_QUEUED;
+ spin_lock_irqsave(&cam->dev_lock, flags);
+ list_add(&sbuf->list, &cam->sb_avail);
+ spin_unlock_irqrestore(&cam->dev_lock, flags);
+ ret = 0;
+out:
+ mutex_unlock(&cam->s_mutex);
+ return ret;
+}
+
+static int mcam_vidioc_dqbuf(struct file *filp, void *priv,
+ struct v4l2_buffer *buf)
+{
+ struct mcam_camera *cam = filp->private_data;
+ struct mcam_sio_buffer *sbuf;
+ int ret = -EINVAL;
+ unsigned long flags;
+
+ mutex_lock(&cam->s_mutex);
+ if (cam->state != S_STREAMING)
+ goto out_unlock;
+ if (list_empty(&cam->sb_full) && filp->f_flags & O_NONBLOCK) {
+ ret = -EAGAIN;
+ goto out_unlock;
+ }
+
+ while (list_empty(&cam->sb_full) && cam->state == S_STREAMING) {
+ mutex_unlock(&cam->s_mutex);
+ if (wait_event_interruptible(cam->iowait,
+ !list_empty(&cam->sb_full))) {
+ ret = -ERESTARTSYS;
+ goto out;
+ }
+ mutex_lock(&cam->s_mutex);
+ }
+
+ if (cam->state != S_STREAMING)
+ ret = -EINTR;
+ else {
+ spin_lock_irqsave(&cam->dev_lock, flags);
+ /* Should probably recheck !list_empty() here */
+ sbuf = list_entry(cam->sb_full.next,
+ struct mcam_sio_buffer, list);
+ list_del_init(&sbuf->list);
+ spin_unlock_irqrestore(&cam->dev_lock, flags);
+ sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_DONE;
+ *buf = sbuf->v4lbuf;
+ ret = 0;
+ }
+
+out_unlock:
+ mutex_unlock(&cam->s_mutex);
+out:
+ return ret;
+}
+
+
+
+static void mcam_v4l_vm_open(struct vm_area_struct *vma)
+{
+ struct mcam_sio_buffer *sbuf = vma->vm_private_data;
+ /*
+ * Locking: done under mmap_sem, so we don't need to
+ * go back to the camera lock here.
+ */
+ sbuf->mapcount++;
+}
+
+
+static void mcam_v4l_vm_close(struct vm_area_struct *vma)
+{
+ struct mcam_sio_buffer *sbuf = vma->vm_private_data;
+
+ mutex_lock(&sbuf->cam->s_mutex);
+ sbuf->mapcount--;
+ /* Docs say we should stop I/O too... */
+ if (sbuf->mapcount == 0)
+ sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_MAPPED;
+ mutex_unlock(&sbuf->cam->s_mutex);
+}
+
+static const struct vm_operations_struct mcam_v4l_vm_ops = {
+ .open = mcam_v4l_vm_open,
+ .close = mcam_v4l_vm_close
+};
+
+
+static int mcam_v4l_mmap(struct file *filp, struct vm_area_struct *vma)
+{
+ struct mcam_camera *cam = filp->private_data;
+ unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
+ int ret = -EINVAL;
+ int i;
+ struct mcam_sio_buffer *sbuf = NULL;
+
+ if (!(vma->vm_flags & VM_WRITE) || !(vma->vm_flags & VM_SHARED))
+ return -EINVAL;
+ /*
+ * Find the buffer they are looking for.
+ */
+ mutex_lock(&cam->s_mutex);
+ for (i = 0; i < cam->n_sbufs; i++)
+ if (cam->sb_bufs[i].v4lbuf.m.offset == offset) {
+ sbuf = cam->sb_bufs + i;
+ break;
+ }
+ if (sbuf == NULL)
+ goto out;
+
+ ret = remap_vmalloc_range(vma, sbuf->buffer, 0);
+ if (ret)
+ goto out;
+ vma->vm_flags |= VM_DONTEXPAND;
+ vma->vm_private_data = sbuf;
+ vma->vm_ops = &mcam_v4l_vm_ops;
+ sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_MAPPED;
+ mcam_v4l_vm_open(vma);
+ ret = 0;
+out:
+ mutex_unlock(&cam->s_mutex);
+ return ret;
+}
+
+
+
+static int mcam_v4l_open(struct file *filp)
+{
+ struct mcam_camera *cam = video_drvdata(filp);
+
+ filp->private_data = cam;
+
+ mutex_lock(&cam->s_mutex);
+ if (cam->users == 0) {
+ mcam_ctlr_power_up(cam);
+ __mcam_cam_reset(cam);
+ mcam_set_config_needed(cam, 1);
+ /* FIXME make sure this is complete */
+ }
+ (cam->users)++;
+ mutex_unlock(&cam->s_mutex);
+ return 0;
+}
+
+
+static int mcam_v4l_release(struct file *filp)
+{
+ struct mcam_camera *cam = filp->private_data;
+
+ mutex_lock(&cam->s_mutex);
+ (cam->users)--;
+ if (filp == cam->owner) {
+ mcam_ctlr_stop_dma(cam);
+ mcam_free_sio_buffers(cam);
+ cam->owner = NULL;
+ }
+ if (cam->users == 0) {
+ mcam_ctlr_power_down(cam);
+ if (alloc_bufs_at_read)
+ mcam_free_dma_bufs(cam);
+ }
+ mutex_unlock(&cam->s_mutex);
+ return 0;
+}
+
+
+
+static unsigned int mcam_v4l_poll(struct file *filp,
+ struct poll_table_struct *pt)
+{
+ struct mcam_camera *cam = filp->private_data;
+
+ poll_wait(filp, &cam->iowait, pt);
+ if (cam->next_buf >= 0)
+ return POLLIN | POLLRDNORM;
+ return 0;
+}
+
+
+
+static int mcam_vidioc_queryctrl(struct file *filp, void *priv,
+ struct v4l2_queryctrl *qc)
+{
+ struct mcam_camera *cam = priv;
+ int ret;
+
+ mutex_lock(&cam->s_mutex);
+ ret = sensor_call(cam, core, queryctrl, qc);
+ mutex_unlock(&cam->s_mutex);
+ return ret;
+}
+
+
+static int mcam_vidioc_g_ctrl(struct file *filp, void *priv,
+ struct v4l2_control *ctrl)
+{
+ struct mcam_camera *cam = priv;
+ int ret;
+
+ mutex_lock(&cam->s_mutex);
+ ret = sensor_call(cam, core, g_ctrl, ctrl);
+ mutex_unlock(&cam->s_mutex);
+ return ret;
+}
+
+
+static int mcam_vidioc_s_ctrl(struct file *filp, void *priv,
+ struct v4l2_control *ctrl)
+{
+ struct mcam_camera *cam = priv;
+ int ret;
+
+ mutex_lock(&cam->s_mutex);
+ ret = sensor_call(cam, core, s_ctrl, ctrl);
+ mutex_unlock(&cam->s_mutex);
+ return ret;
+}
+
+
+
+
+
+static int mcam_vidioc_querycap(struct file *file, void *priv,
+ struct v4l2_capability *cap)
+{
+ strcpy(cap->driver, "marvell_ccic");
+ strcpy(cap->card, "marvell_ccic");
+ cap->version = 1;
+ cap->capabilities = V4L2_CAP_VIDEO_CAPTURE |
+ V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;
+ return 0;
+}
+
+
+/*
+ * The default format we use until somebody says otherwise.
+ */
+static const struct v4l2_pix_format mcam_def_pix_format = {
+ .width = VGA_WIDTH,
+ .height = VGA_HEIGHT,
+ .pixelformat = V4L2_PIX_FMT_YUYV,
+ .field = V4L2_FIELD_NONE,
+ .bytesperline = VGA_WIDTH*2,
+ .sizeimage = VGA_WIDTH*VGA_HEIGHT*2,
+};
+
+static const enum v4l2_mbus_pixelcode mcam_def_mbus_code =
+ V4L2_MBUS_FMT_YUYV8_2X8;
+
+static int mcam_vidioc_enum_fmt_vid_cap(struct file *filp,
+ void *priv, struct v4l2_fmtdesc *fmt)
+{
+ if (fmt->index >= N_MCAM_FMTS)
+ return -EINVAL;
+ strlcpy(fmt->description, mcam_formats[fmt->index].desc,
+ sizeof(fmt->description));
+ fmt->pixelformat = mcam_formats[fmt->index].pixelformat;
+ return 0;
+}
+
+static int mcam_vidioc_try_fmt_vid_cap(struct file *filp, void *priv,
+ struct v4l2_format *fmt)
+{
+ struct mcam_camera *cam = priv;
+ struct mcam_format_struct *f;
+ struct v4l2_pix_format *pix = &fmt->fmt.pix;
+ struct v4l2_mbus_framefmt mbus_fmt;
+ int ret;
+
+ f = mcam_find_format(pix->pixelformat);
+ pix->pixelformat = f->pixelformat;
+ v4l2_fill_mbus_format(&mbus_fmt, pix, f->mbus_code);
+ mutex_lock(&cam->s_mutex);
+ ret = sensor_call(cam, video, try_mbus_fmt, &mbus_fmt);
+ mutex_unlock(&cam->s_mutex);
+ v4l2_fill_pix_format(pix, &mbus_fmt);
+ pix->bytesperline = pix->width * f->bpp;
+ pix->sizeimage = pix->height * pix->bytesperline;
+ return ret;
+}
+
+static int mcam_vidioc_s_fmt_vid_cap(struct file *filp, void *priv,
+ struct v4l2_format *fmt)
+{
+ struct mcam_camera *cam = priv;
+ struct mcam_format_struct *f;
+ int ret;
+
+ /*
+ * Can't do anything if the device is not idle
+ * Also can't if there are streaming buffers in place.
+ */
+ if (cam->state != S_IDLE || cam->n_sbufs > 0)
+ return -EBUSY;
+
+ f = mcam_find_format(fmt->fmt.pix.pixelformat);
+
+ /*
+ * See if the formatting works in principle.
+ */
+ ret = mcam_vidioc_try_fmt_vid_cap(filp, priv, fmt);
+ if (ret)
+ return ret;
+ /*
+ * Now we start to change things for real, so let's do it
+ * under lock.
+ */
+ mutex_lock(&cam->s_mutex);
+ cam->pix_format = fmt->fmt.pix;
+ cam->mbus_code = f->mbus_code;
+
+ /*
+ * Make sure we have appropriate DMA buffers.
+ */
+ ret = -ENOMEM;
+ if (cam->nbufs > 0 && cam->dma_buf_size < cam->pix_format.sizeimage)
+ mcam_free_dma_bufs(cam);
+ if (cam->nbufs == 0) {
+ if (mcam_alloc_dma_bufs(cam, 0))
+ goto out;
+ }
+ /*
+ * It looks like this might work, so let's program the sensor.
+ */
+ ret = mcam_cam_configure(cam);
+ if (!ret)
+ ret = mcam_ctlr_configure(cam);
+out:
+ mutex_unlock(&cam->s_mutex);
+ return ret;
+}
+
+/*
+ * Return our stored notion of how the camera is/should be configured.
+ * The V4l2 spec wants us to be smarter, and actually get this from
+ * the camera (and not mess with it at open time). Someday.
+ */
+static int mcam_vidioc_g_fmt_vid_cap(struct file *filp, void *priv,
+ struct v4l2_format *f)
+{
+ struct mcam_camera *cam = priv;
+
+ f->fmt.pix = cam->pix_format;
+ return 0;
+}
+
+/*
+ * We only have one input - the sensor - so minimize the nonsense here.
+ */
+static int mcam_vidioc_enum_input(struct file *filp, void *priv,
+ struct v4l2_input *input)
+{
+ if (input->index != 0)
+ return -EINVAL;
+
+ input->type = V4L2_INPUT_TYPE_CAMERA;
+ input->std = V4L2_STD_ALL; /* Not sure what should go here */
+ strcpy(input->name, "Camera");
+ return 0;
+}
+
+static int mcam_vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
+{
+ *i = 0;
+ return 0;
+}
+
+static int mcam_vidioc_s_input(struct file *filp, void *priv, unsigned int i)
+{
+ if (i != 0)
+ return -EINVAL;
+ return 0;
+}
+
+/* from vivi.c */
+static int mcam_vidioc_s_std(struct file *filp, void *priv, v4l2_std_id *a)
+{
+ return 0;
+}
+
+/*
+ * G/S_PARM. Most of this is done by the sensor, but we are
+ * the level which controls the number of read buffers.
+ */
+static int mcam_vidioc_g_parm(struct file *filp, void *priv,
+ struct v4l2_streamparm *parms)
+{
+ struct mcam_camera *cam = priv;
+ int ret;
+
+ mutex_lock(&cam->s_mutex);
+ ret = sensor_call(cam, video, g_parm, parms);
+ mutex_unlock(&cam->s_mutex);
+ parms->parm.capture.readbuffers = n_dma_bufs;
+ return ret;
+}
+
+static int mcam_vidioc_s_parm(struct file *filp, void *priv,
+ struct v4l2_streamparm *parms)
+{
+ struct mcam_camera *cam = priv;
+ int ret;
+
+ mutex_lock(&cam->s_mutex);
+ ret = sensor_call(cam, video, s_parm, parms);
+ mutex_unlock(&cam->s_mutex);
+ parms->parm.capture.readbuffers = n_dma_bufs;
+ return ret;
+}
+
+static int mcam_vidioc_g_chip_ident(struct file *file, void *priv,
+ struct v4l2_dbg_chip_ident *chip)
+{
+ struct mcam_camera *cam = priv;
+
+ chip->ident = V4L2_IDENT_NONE;
+ chip->revision = 0;
+ if (v4l2_chip_match_host(&chip->match)) {
+ chip->ident = cam->chip_id;
+ return 0;
+ }
+ return sensor_call(cam, core, g_chip_ident, chip);
+}
+
+static int mcam_vidioc_enum_framesizes(struct file *filp, void *priv,
+ struct v4l2_frmsizeenum *sizes)
+{
+ struct mcam_camera *cam = priv;
+ int ret;
+
+ mutex_lock(&cam->s_mutex);
+ ret = sensor_call(cam, video, enum_framesizes, sizes);
+ mutex_unlock(&cam->s_mutex);
+ return ret;
+}
+
+static int mcam_vidioc_enum_frameintervals(struct file *filp, void *priv,
+ struct v4l2_frmivalenum *interval)
+{
+ struct mcam_camera *cam = priv;
+ int ret;
+
+ mutex_lock(&cam->s_mutex);
+ ret = sensor_call(cam, video, enum_frameintervals, interval);
+ mutex_unlock(&cam->s_mutex);
+ return ret;
+}
+
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+static int mcam_vidioc_g_register(struct file *file, void *priv,
+ struct v4l2_dbg_register *reg)
+{
+ struct mcam_camera *cam = priv;
+
+ if (v4l2_chip_match_host(®->match)) {
+ reg->val = mcam_reg_read(cam, reg->reg);
+ reg->size = 4;
+ return 0;
+ }
+ return sensor_call(cam, core, g_register, reg);
+}
+
+static int mcam_vidioc_s_register(struct file *file, void *priv,
+ struct v4l2_dbg_register *reg)
+{
+ struct mcam_camera *cam = priv;
+
+ if (v4l2_chip_match_host(®->match)) {
+ mcam_reg_write(cam, reg->reg, reg->val);
+ return 0;
+ }
+ return sensor_call(cam, core, s_register, reg);
+}
+#endif
+
+/*
+ * This template device holds all of those v4l2 methods; we
+ * clone it for specific real devices.
+ */
+
+static const struct v4l2_file_operations mcam_v4l_fops = {
+ .owner = THIS_MODULE,
+ .open = mcam_v4l_open,
+ .release = mcam_v4l_release,
+ .read = mcam_v4l_read,
+ .poll = mcam_v4l_poll,
+ .mmap = mcam_v4l_mmap,
+ .unlocked_ioctl = video_ioctl2,
+};
+
+static const struct v4l2_ioctl_ops mcam_v4l_ioctl_ops = {
+ .vidioc_querycap = mcam_vidioc_querycap,
+ .vidioc_enum_fmt_vid_cap = mcam_vidioc_enum_fmt_vid_cap,
+ .vidioc_try_fmt_vid_cap = mcam_vidioc_try_fmt_vid_cap,
+ .vidioc_s_fmt_vid_cap = mcam_vidioc_s_fmt_vid_cap,
+ .vidioc_g_fmt_vid_cap = mcam_vidioc_g_fmt_vid_cap,
+ .vidioc_enum_input = mcam_vidioc_enum_input,
+ .vidioc_g_input = mcam_vidioc_g_input,
+ .vidioc_s_input = mcam_vidioc_s_input,
+ .vidioc_s_std = mcam_vidioc_s_std,
+ .vidioc_reqbufs = mcam_vidioc_reqbufs,
+ .vidioc_querybuf = mcam_vidioc_querybuf,
+ .vidioc_qbuf = mcam_vidioc_qbuf,
+ .vidioc_dqbuf = mcam_vidioc_dqbuf,
+ .vidioc_streamon = mcam_vidioc_streamon,
+ .vidioc_streamoff = mcam_vidioc_streamoff,
+ .vidioc_queryctrl = mcam_vidioc_queryctrl,
+ .vidioc_g_ctrl = mcam_vidioc_g_ctrl,
+ .vidioc_s_ctrl = mcam_vidioc_s_ctrl,
+ .vidioc_g_parm = mcam_vidioc_g_parm,
+ .vidioc_s_parm = mcam_vidioc_s_parm,
+ .vidioc_enum_framesizes = mcam_vidioc_enum_framesizes,
+ .vidioc_enum_frameintervals = mcam_vidioc_enum_frameintervals,
+ .vidioc_g_chip_ident = mcam_vidioc_g_chip_ident,
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+ .vidioc_g_register = mcam_vidioc_g_register,
+ .vidioc_s_register = mcam_vidioc_s_register,
+#endif
+};
+
+static struct video_device mcam_v4l_template = {
+ .name = "mcam",
+ .tvnorms = V4L2_STD_NTSC_M,
+ .current_norm = V4L2_STD_NTSC_M, /* make mplayer happy */
+
+ .fops = &mcam_v4l_fops,
+ .ioctl_ops = &mcam_v4l_ioctl_ops,
+ .release = video_device_release_empty,
+};
+
+/* ---------------------------------------------------------------------- */
+/*
+ * Interrupt handler stuff
+ */
+
+
+
+static void mcam_frame_tasklet(unsigned long data)
+{
+ struct mcam_camera *cam = (struct mcam_camera *) data;
+ int i;
+ unsigned long flags;
+ struct mcam_sio_buffer *sbuf;
+
+ spin_lock_irqsave(&cam->dev_lock, flags);
+ for (i = 0; i < cam->nbufs; i++) {
+ int bufno = cam->next_buf;
+ if (bufno < 0) { /* "will never happen" */
+ cam_err(cam, "No valid bufs in tasklet!\n");
+ break;
+ }
+ if (++(cam->next_buf) >= cam->nbufs)
+ cam->next_buf = 0;
+ if (!test_bit(bufno, &cam->flags))
+ continue;
+ if (list_empty(&cam->sb_avail))
+ break; /* Leave it valid, hope for better later */
+ clear_bit(bufno, &cam->flags);
+ sbuf = list_entry(cam->sb_avail.next,
+ struct mcam_sio_buffer, list);
+ /*
+ * Drop the lock during the big copy. This *should* be safe...
+ */
+ spin_unlock_irqrestore(&cam->dev_lock, flags);
+ memcpy(sbuf->buffer, cam->dma_bufs[bufno],
+ cam->pix_format.sizeimage);
+ sbuf->v4lbuf.bytesused = cam->pix_format.sizeimage;
+ sbuf->v4lbuf.sequence = cam->buf_seq[bufno];
+ sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_QUEUED;
+ sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_DONE;
+ spin_lock_irqsave(&cam->dev_lock, flags);
+ list_move_tail(&sbuf->list, &cam->sb_full);
+ }
+ if (!list_empty(&cam->sb_full))
+ wake_up(&cam->iowait);
+ spin_unlock_irqrestore(&cam->dev_lock, flags);
+}
+
+
+
+static void mcam_frame_complete(struct mcam_camera *cam, int frame)
+{
+ /*
+ * Basic frame housekeeping.
+ */
+ if (test_bit(frame, &cam->flags) && printk_ratelimit())
+ cam_err(cam, "Frame overrun on %d, frames lost\n", frame);
+ set_bit(frame, &cam->flags);
+ clear_bit(CF_DMA_ACTIVE, &cam->flags);
+ if (cam->next_buf < 0)
+ cam->next_buf = frame;
+ cam->buf_seq[frame] = ++(cam->sequence);
+
+ switch (cam->state) {
+ /*
+ * If in single read mode, try going speculative.
+ */
+ case S_SINGLEREAD:
+ cam->state = S_SPECREAD;
+ cam->specframes = 0;
+ wake_up(&cam->iowait);
+ break;
+
+ /*
+ * If we are already doing speculative reads, and nobody is
+ * reading them, just stop.
+ */
+ case S_SPECREAD:
+ if (++(cam->specframes) >= cam->nbufs) {
+ mcam_ctlr_stop(cam);
+ mcam_ctlr_irq_disable(cam);
+ cam->state = S_IDLE;
+ }
+ wake_up(&cam->iowait);
+ break;
+ /*
+ * For the streaming case, we defer the real work to the
+ * camera tasklet.
+ *
+ * FIXME: if the application is not consuming the buffers,
+ * we should eventually put things on hold and restart in
+ * vidioc_dqbuf().
+ */
+ case S_STREAMING:
+ tasklet_schedule(&cam->s_tasklet);
+ break;
+
+ default:
+ cam_err(cam, "Frame interrupt in non-operational state\n");
+ break;
+ }
+}
+
+
+
+
+int mccic_irq(struct mcam_camera *cam, unsigned int irqs)
+{
+ unsigned int frame, handled = 0;
+
+ mcam_reg_write(cam, REG_IRQSTAT, FRAMEIRQS); /* Clear'em all */
+ /*
+ * Handle any frame completions. There really should
+ * not be more than one of these, or we have fallen
+ * far behind.
+ */
+ for (frame = 0; frame < cam->nbufs; frame++)
+ if (irqs & (IRQ_EOF0 << frame)) {
+ mcam_frame_complete(cam, frame);
+ handled = 1;
+ }
+ /*
+ * If a frame starts, note that we have DMA active. This
+ * code assumes that we won't get multiple frame interrupts
+ * at once; may want to rethink that.
+ */
+ if (irqs & (IRQ_SOF0 | IRQ_SOF1 | IRQ_SOF2)) {
+ set_bit(CF_DMA_ACTIVE, &cam->flags);
+ handled = 1;
+ }
+ return handled;
+}
+
+/*
+ * Registration and such.
+ */
+
+/* FIXME this is really platform stuff */
+static const struct dmi_system_id olpc_xo1_dmi[] = {
+ {
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "OLPC"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "XO"),
+ DMI_MATCH(DMI_PRODUCT_VERSION, "1"),
+ },
+ },
+ { }
+};
+
+static struct ov7670_config sensor_cfg = {
+ /* This controller only does SMBUS */
+ .use_smbus = true,
+
+ /*
+ * Exclude QCIF mode, because it only captures a tiny portion
+ * of the sensor FOV
+ */
+ .min_width = 320,
+ .min_height = 240,
+};
+
+
+int mccic_register(struct mcam_camera *cam)
+{
+ struct i2c_board_info ov7670_info = {
+ .type = "ov7670",
+ .addr = 0x42,
+ .platform_data = &sensor_cfg,
+ };
+ int ret;
+
+ /*
+ * Register with V4L
+ */
+ ret = v4l2_device_register(cam->dev, &cam->v4l2_dev);
+ if (ret)
+ return ret;
+
+ mutex_init(&cam->s_mutex);
+ cam->state = S_NOTREADY;
+ mcam_set_config_needed(cam, 1);
+ init_waitqueue_head(&cam->iowait);
+ cam->pix_format = mcam_def_pix_format;
+ cam->mbus_code = mcam_def_mbus_code;
+ INIT_LIST_HEAD(&cam->dev_list);
+ INIT_LIST_HEAD(&cam->sb_avail);
+ INIT_LIST_HEAD(&cam->sb_full);
+ tasklet_init(&cam->s_tasklet, mcam_frame_tasklet, (unsigned long) cam);
+
+ mcam_ctlr_init(cam);
+
+ /* Apply XO-1 clock speed */
+ if (dmi_check_system(olpc_xo1_dmi))
+ sensor_cfg.clock_speed = 45;
+
+ /*
+ * Try to find the sensor.
+ */
+ cam->sensor_addr = ov7670_info.addr;
+ cam->sensor = v4l2_i2c_new_subdev_board(&cam->v4l2_dev,
+ &cam->i2c_adapter, &ov7670_info, NULL);
+ if (cam->sensor == NULL) {
+ ret = -ENODEV;
+ goto out_unregister;
+ }
+
+ ret = mcam_cam_init(cam);
+ if (ret)
+ goto out_unregister;
+ /*
+ * Get the v4l2 setup done.
+ */
+ mutex_lock(&cam->s_mutex);
+ cam->vdev = mcam_v4l_template;
+ cam->vdev.debug = 0;
+ cam->vdev.v4l2_dev = &cam->v4l2_dev;
+ ret = video_register_device(&cam->vdev, VFL_TYPE_GRABBER, -1);
+ if (ret)
+ goto out;
+ video_set_drvdata(&cam->vdev, cam);
+
+ /*
+ * If so requested, try to get our DMA buffers now.
+ */
+ if (!alloc_bufs_at_read) {
+ if (mcam_alloc_dma_bufs(cam, 1))
+ cam_warn(cam, "Unable to alloc DMA buffers at load"
+ " will try again later.");
+ }
+
+out:
+ mutex_unlock(&cam->s_mutex);
+ return ret;
+out_unregister:
+ v4l2_device_unregister(&cam->v4l2_dev);
+ return ret;
+}
+
+
+void mccic_shutdown(struct mcam_camera *cam)
+{
+ if (cam->users > 0)
+ cam_warn(cam, "Removing a device with users!\n");
+ if (cam->n_sbufs > 0)
+ /* What if they are still mapped? Shouldn't be, but... */
+ mcam_free_sio_buffers(cam);
+ mcam_ctlr_stop_dma(cam);
+ mcam_ctlr_power_down(cam);
+ mcam_free_dma_bufs(cam);
+ video_unregister_device(&cam->vdev);
+ v4l2_device_unregister(&cam->v4l2_dev);
+}
+
+/*
+ * Power management
+ */
+#ifdef CONFIG_PM
+
+void mccic_suspend(struct mcam_camera *cam)
+{
+ enum mcam_state cstate = cam->state;
+
+ mcam_ctlr_stop_dma(cam);
+ mcam_ctlr_power_down(cam);
+ cam->state = cstate;
+}
+
+int mccic_resume(struct mcam_camera *cam)
+{
+ int ret = 0;
+
+ mutex_lock(&cam->s_mutex);
+ if (cam->users > 0) {
+ mcam_ctlr_power_up(cam);
+ __mcam_cam_reset(cam);
+ } else {
+ mcam_ctlr_power_down(cam);
+ }
+ mutex_unlock(&cam->s_mutex);
+
+ set_bit(CF_CONFIG_NEEDED, &cam->flags);
+ if (cam->state == S_SPECREAD)
+ cam->state = S_IDLE; /* Don't bother restarting */
+ else if (cam->state == S_SINGLEREAD || cam->state == S_STREAMING)
+ ret = mcam_read_setup(cam, cam->state);
+ return ret;
+}
+#endif /* CONFIG_PM */
--- /dev/null
+/*
+ * Marvell camera core structures.
+ *
+ * Copyright 2011 Jonathan Corbet corbet@lwn.net
+ */
+
+/*
+ * Tracking of streaming I/O buffers.
+ * FIXME doesn't belong in this file
+ */
+struct mcam_sio_buffer {
+ struct list_head list;
+ struct v4l2_buffer v4lbuf;
+ char *buffer; /* Where it lives in kernel space */
+ int mapcount;
+ struct mcam_camera *cam;
+};
+
+enum mcam_state {
+ S_NOTREADY, /* Not yet initialized */
+ S_IDLE, /* Just hanging around */
+ S_FLAKED, /* Some sort of problem */
+ S_SINGLEREAD, /* In read() */
+ S_SPECREAD, /* Speculative read (for future read()) */
+ S_STREAMING /* Streaming data */
+};
+#define MAX_DMA_BUFS 3
+
+/*
+ * A description of one of our devices.
+ * Locking: controlled by s_mutex. Certain fields, however, require
+ * the dev_lock spinlock; they are marked as such by comments.
+ * dev_lock is also required for access to device registers.
+ */
+struct mcam_camera {
+ /*
+ * These fields should be set by the platform code prior to
+ * calling mcam_register().
+ */
+ struct i2c_adapter i2c_adapter;
+ unsigned char __iomem *regs;
+ spinlock_t dev_lock;
+ struct device *dev; /* For messages, dma alloc */
+ unsigned int chip_id;
+
+ /*
+ * Callbacks from the core to the platform code.
+ */
+ void (*plat_power_up) (struct mcam_camera *cam);
+ void (*plat_power_down) (struct mcam_camera *cam);
+
+ /*
+ * Everything below here is private to the mcam core and
+ * should not be touched by the platform code.
+ */
+ struct v4l2_device v4l2_dev;
+ enum mcam_state state;
+ unsigned long flags; /* Buffer status, mainly (dev_lock) */
+ int users; /* How many open FDs */
+ struct file *owner; /* Who has data access (v4l2) */
+
+ /*
+ * Subsystem structures.
+ */
+ struct video_device vdev;
+ struct v4l2_subdev *sensor;
+ unsigned short sensor_addr;
+
+ struct list_head dev_list; /* link to other devices */
+
+ /* DMA buffers */
+ unsigned int nbufs; /* How many are alloc'd */
+ int next_buf; /* Next to consume (dev_lock) */
+ unsigned int dma_buf_size; /* allocated size */
+ void *dma_bufs[MAX_DMA_BUFS]; /* Internal buffer addresses */
+ dma_addr_t dma_handles[MAX_DMA_BUFS]; /* Buffer bus addresses */
+ unsigned int specframes; /* Unconsumed spec frames (dev_lock) */
+ unsigned int sequence; /* Frame sequence number */
+ unsigned int buf_seq[MAX_DMA_BUFS]; /* Sequence for individual buffers */
+
+ /* Streaming buffers */
+ unsigned int n_sbufs; /* How many we have */
+ struct mcam_sio_buffer *sb_bufs; /* The array of housekeeping structs */
+ struct list_head sb_avail; /* Available for data (we own) (dev_lock) */
+ struct list_head sb_full; /* With data (user space owns) (dev_lock) */
+ struct tasklet_struct s_tasklet;
+
+ /* Current operating parameters */
+ u32 sensor_type; /* Currently ov7670 only */
+ struct v4l2_pix_format pix_format;
+ enum v4l2_mbus_pixelcode mbus_code;
+
+ /* Locks */
+ struct mutex s_mutex; /* Access to this structure */
+
+ /* Misc */
+ wait_queue_head_t iowait; /* Waiting on frame data */
+};
+
+
+/*
+ * Register I/O functions. These are here because the platform code
+ * may legitimately need to mess with the register space.
+ */
+/*
+ * Device register I/O
+ */
+static inline void mcam_reg_write(struct mcam_camera *cam, unsigned int reg,
+ unsigned int val)
+{
+ iowrite32(val, cam->regs + reg);
+}
+
+static inline unsigned int mcam_reg_read(struct mcam_camera *cam,
+ unsigned int reg)
+{
+ return ioread32(cam->regs + reg);
+}
+
+
+static inline void mcam_reg_write_mask(struct mcam_camera *cam, unsigned int reg,
+ unsigned int val, unsigned int mask)
+{
+ unsigned int v = mcam_reg_read(cam, reg);
+
+ v = (v & ~mask) | (val & mask);
+ mcam_reg_write(cam, reg, v);
+}
+
+static inline void mcam_reg_clear_bit(struct mcam_camera *cam,
+ unsigned int reg, unsigned int val)
+{
+ mcam_reg_write_mask(cam, reg, 0, val);
+}
+
+static inline void mcam_reg_set_bit(struct mcam_camera *cam,
+ unsigned int reg, unsigned int val)
+{
+ mcam_reg_write_mask(cam, reg, val, val);
+}
+
+/*
+ * Functions for use by platform code.
+ */
+int mccic_register(struct mcam_camera *cam);
+int mccic_irq(struct mcam_camera *cam, unsigned int irqs);
+void mccic_shutdown(struct mcam_camera *cam);
+#ifdef CONFIG_PM
+void mccic_suspend(struct mcam_camera *cam);
+int mccic_resume(struct mcam_camera *cam);
+#endif
+
+/*
+ * Register definitions for the m88alp01 camera interface. Offsets in bytes
+ * as given in the spec.
+ */
+#define REG_Y0BAR 0x00
+#define REG_Y1BAR 0x04
+#define REG_Y2BAR 0x08
+/* ... */
+
+#define REG_IMGPITCH 0x24 /* Image pitch register */
+#define IMGP_YP_SHFT 2 /* Y pitch params */
+#define IMGP_YP_MASK 0x00003ffc /* Y pitch field */
+#define IMGP_UVP_SHFT 18 /* UV pitch (planar) */
+#define IMGP_UVP_MASK 0x3ffc0000
+#define REG_IRQSTATRAW 0x28 /* RAW IRQ Status */
+#define IRQ_EOF0 0x00000001 /* End of frame 0 */
+#define IRQ_EOF1 0x00000002 /* End of frame 1 */
+#define IRQ_EOF2 0x00000004 /* End of frame 2 */
+#define IRQ_SOF0 0x00000008 /* Start of frame 0 */
+#define IRQ_SOF1 0x00000010 /* Start of frame 1 */
+#define IRQ_SOF2 0x00000020 /* Start of frame 2 */
+#define IRQ_OVERFLOW 0x00000040 /* FIFO overflow */
+#define IRQ_TWSIW 0x00010000 /* TWSI (smbus) write */
+#define IRQ_TWSIR 0x00020000 /* TWSI read */
+#define IRQ_TWSIE 0x00040000 /* TWSI error */
+#define TWSIIRQS (IRQ_TWSIW|IRQ_TWSIR|IRQ_TWSIE)
+#define FRAMEIRQS (IRQ_EOF0|IRQ_EOF1|IRQ_EOF2|IRQ_SOF0|IRQ_SOF1|IRQ_SOF2)
+#define ALLIRQS (TWSIIRQS|FRAMEIRQS|IRQ_OVERFLOW)
+#define REG_IRQMASK 0x2c /* IRQ mask - same bits as IRQSTAT */
+#define REG_IRQSTAT 0x30 /* IRQ status / clear */
+
+#define REG_IMGSIZE 0x34 /* Image size */
+#define IMGSZ_V_MASK 0x1fff0000
+#define IMGSZ_V_SHIFT 16
+#define IMGSZ_H_MASK 0x00003fff
+#define REG_IMGOFFSET 0x38 /* IMage offset */
+
+#define REG_CTRL0 0x3c /* Control 0 */
+#define C0_ENABLE 0x00000001 /* Makes the whole thing go */
+
+/* Mask for all the format bits */
+#define C0_DF_MASK 0x00fffffc /* Bits 2-23 */
+
+/* RGB ordering */
+#define C0_RGB4_RGBX 0x00000000
+#define C0_RGB4_XRGB 0x00000004
+#define C0_RGB4_BGRX 0x00000008
+#define C0_RGB4_XBGR 0x0000000c
+#define C0_RGB5_RGGB 0x00000000
+#define C0_RGB5_GRBG 0x00000004
+#define C0_RGB5_GBRG 0x00000008
+#define C0_RGB5_BGGR 0x0000000c
+
+/* Spec has two fields for DIN and DOUT, but they must match, so
+ combine them here. */
+#define C0_DF_YUV 0x00000000 /* Data is YUV */
+#define C0_DF_RGB 0x000000a0 /* ... RGB */
+#define C0_DF_BAYER 0x00000140 /* ... Bayer */
+/* 8-8-8 must be missing from the below - ask */
+#define C0_RGBF_565 0x00000000
+#define C0_RGBF_444 0x00000800
+#define C0_RGB_BGR 0x00001000 /* Blue comes first */
+#define C0_YUV_PLANAR 0x00000000 /* YUV 422 planar format */
+#define C0_YUV_PACKED 0x00008000 /* YUV 422 packed */
+#define C0_YUV_420PL 0x0000a000 /* YUV 420 planar */
+/* Think that 420 packed must be 111 - ask */
+#define C0_YUVE_YUYV 0x00000000 /* Y1CbY0Cr */
+#define C0_YUVE_YVYU 0x00010000 /* Y1CrY0Cb */
+#define C0_YUVE_VYUY 0x00020000 /* CrY1CbY0 */
+#define C0_YUVE_UYVY 0x00030000 /* CbY1CrY0 */
+#define C0_YUVE_XYUV 0x00000000 /* 420: .YUV */
+#define C0_YUVE_XYVU 0x00010000 /* 420: .YVU */
+#define C0_YUVE_XUVY 0x00020000 /* 420: .UVY */
+#define C0_YUVE_XVUY 0x00030000 /* 420: .VUY */
+/* Bayer bits 18,19 if needed */
+#define C0_HPOL_LOW 0x01000000 /* HSYNC polarity active low */
+#define C0_VPOL_LOW 0x02000000 /* VSYNC polarity active low */
+#define C0_VCLK_LOW 0x04000000 /* VCLK on falling edge */
+#define C0_DOWNSCALE 0x08000000 /* Enable downscaler */
+#define C0_SIFM_MASK 0xc0000000 /* SIF mode bits */
+#define C0_SIF_HVSYNC 0x00000000 /* Use H/VSYNC */
+#define CO_SOF_NOSYNC 0x40000000 /* Use inband active signaling */
+
+
+#define REG_CTRL1 0x40 /* Control 1 */
+#define C1_444ALPHA 0x00f00000 /* Alpha field in RGB444 */
+#define C1_ALPHA_SHFT 20
+#define C1_DMAB32 0x00000000 /* 32-byte DMA burst */
+#define C1_DMAB16 0x02000000 /* 16-byte DMA burst */
+#define C1_DMAB64 0x04000000 /* 64-byte DMA burst */
+#define C1_DMAB_MASK 0x06000000
+#define C1_TWOBUFS 0x08000000 /* Use only two DMA buffers */
+#define C1_PWRDWN 0x10000000 /* Power down */
+
+#define REG_CLKCTRL 0x88 /* Clock control */
+#define CLK_DIV_MASK 0x0000ffff /* Upper bits RW "reserved" */
+
+#define REG_GPR 0xb4 /* General purpose register. This
+ controls inputs to the power and reset
+ pins on the OV7670 used with OLPC;
+ other deployments could differ. */
+#define GPR_C1EN 0x00000020 /* Pad 1 (power down) enable */
+#define GPR_C0EN 0x00000010 /* Pad 0 (reset) enable */
+#define GPR_C1 0x00000002 /* Control 1 value */
+/*
+ * Control 0 is wired to reset on OLPC machines. For ov7x sensors,
+ * it is active low, for 0v6x, instead, it's active high. What
+ * fun.
+ */
+#define GPR_C0 0x00000001 /* Control 0 value */
+
+#define REG_TWSIC0 0xb8 /* TWSI (smbus) control 0 */
+#define TWSIC0_EN 0x00000001 /* TWSI enable */
+#define TWSIC0_MODE 0x00000002 /* 1 = 16-bit, 0 = 8-bit */
+#define TWSIC0_SID 0x000003fc /* Slave ID */
+#define TWSIC0_SID_SHIFT 2
+#define TWSIC0_CLKDIV 0x0007fc00 /* Clock divider */
+#define TWSIC0_MASKACK 0x00400000 /* Mask ack from sensor */
+#define TWSIC0_OVMAGIC 0x00800000 /* Make it work on OV sensors */
+
+#define REG_TWSIC1 0xbc /* TWSI control 1 */
+#define TWSIC1_DATA 0x0000ffff /* Data to/from camchip */
+#define TWSIC1_ADDR 0x00ff0000 /* Address (register) */
+#define TWSIC1_ADDR_SHIFT 16
+#define TWSIC1_READ 0x01000000 /* Set for read op */
+#define TWSIC1_WSTAT 0x02000000 /* Write status */
+#define TWSIC1_RVALID 0x04000000 /* Read data valid */
+#define TWSIC1_ERROR 0x08000000 /* Something screwed up */
+
+
+#define REG_UBAR 0xc4 /* Upper base address register */
+
+/*
+ * Here's the weird global control registers which are said to live
+ * way up here.
+ */
+#define REG_GL_CSR 0x3004 /* Control/status register */
+#define GCSR_SRS 0x00000001 /* SW Reset set */
+#define GCSR_SRC 0x00000002 /* SW Reset clear */
+#define GCSR_MRS 0x00000004 /* Master reset set */
+#define GCSR_MRC 0x00000008 /* HW Reset clear */
+#define GCSR_CCIC_EN 0x00004000 /* CCIC Clock enable */
+#define REG_GL_IMASK 0x300c /* Interrupt mask register */
+#define GIMSK_CCIC_EN 0x00000004 /* CCIC Interrupt enable */
+
+#define REG_GL_FCR 0x3038 /* GPIO functional control register */
+#define GFCR_GPIO_ON 0x08 /* Camera GPIO enabled */
+#define REG_GL_GPIOR 0x315c /* GPIO register */
+#define GGPIO_OUT 0x80000 /* GPIO output */
+#define GGPIO_VAL 0x00008 /* Output pin value */
+
+#define REG_LEN (REG_GL_IMASK + 4)
+
+
+/*
+ * Useful stuff that probably belongs somewhere global.
+ */
+#define VGA_WIDTH 640
+#define VGA_HEIGHT 480
projects / thirdparty / kernel / stable.git / commitdiff
