+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Mainly by David Woodhouse, somewhat modified by Jordan Crouse
- *
- * Copyright © 2006-2007 Red Hat, Inc.
- * Copyright © 2006-2007 Advanced Micro Devices, Inc.
- * Copyright © 2009 VIA Technology, Inc.
- * Copyright (c) 2010-2011 Andres Salomon <dilinger@queued.net>
- */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/kernel.h>
-#include <linux/fb.h>
-#include <linux/console.h>
-#include <linux/i2c.h>
-#include <linux/platform_device.h>
-#include <linux/interrupt.h>
-#include <linux/delay.h>
-#include <linux/module.h>
-#include <linux/backlight.h>
-#include <linux/device.h>
-#include <linux/uaccess.h>
-#include <linux/ctype.h>
-#include <linux/panic_notifier.h>
-#include <linux/reboot.h>
-#include <linux/olpc-ec.h>
-#include <asm/tsc.h>
-#include <asm/olpc.h>
-
-#include "olpc_dcon.h"
-
-/* Module definitions */
-
-static ushort resumeline = 898;
-module_param(resumeline, ushort, 0444);
-
-static struct dcon_platform_data *pdata;
-
-/* I2C structures */
-
-/* Platform devices */
-static struct platform_device *dcon_device;
-
-static unsigned short normal_i2c[] = { 0x0d, I2C_CLIENT_END };
-
-static s32 dcon_write(struct dcon_priv *dcon, u8 reg, u16 val)
-{
- return i2c_smbus_write_word_data(dcon->client, reg, val);
-}
-
-static s32 dcon_read(struct dcon_priv *dcon, u8 reg)
-{
- return i2c_smbus_read_word_data(dcon->client, reg);
-}
-
-/* ===== API functions - these are called by a variety of users ==== */
-
-static int dcon_hw_init(struct dcon_priv *dcon, int is_init)
-{
- u16 ver;
- int rc = 0;
-
- ver = dcon_read(dcon, DCON_REG_ID);
- if ((ver >> 8) != 0xDC) {
- pr_err("DCON ID not 0xDCxx: 0x%04x instead.\n", ver);
- rc = -ENXIO;
- goto err;
- }
-
- if (is_init) {
- pr_info("Discovered DCON version %x\n", ver & 0xFF);
- rc = pdata->init(dcon);
- if (rc != 0) {
- pr_err("Unable to init.\n");
- goto err;
- }
- }
-
- if (ver < 0xdc02) {
- dev_err(&dcon->client->dev,
- "DCON v1 is unsupported, giving up..\n");
- rc = -ENODEV;
- goto err;
- }
-
- /* SDRAM setup/hold time */
- dcon_write(dcon, 0x3a, 0xc040);
- dcon_write(dcon, DCON_REG_MEM_OPT_A, 0x0000); /* clear option bits */
- dcon_write(dcon, DCON_REG_MEM_OPT_A,
- MEM_DLL_CLOCK_DELAY | MEM_POWER_DOWN);
- dcon_write(dcon, DCON_REG_MEM_OPT_B, MEM_SOFT_RESET);
-
- /* Colour swizzle, AA, no passthrough, backlight */
- if (is_init) {
- dcon->disp_mode = MODE_PASSTHRU | MODE_BL_ENABLE |
- MODE_CSWIZZLE | MODE_COL_AA;
- }
- dcon_write(dcon, DCON_REG_MODE, dcon->disp_mode);
-
- /* Set the scanline to interrupt on during resume */
- dcon_write(dcon, DCON_REG_SCAN_INT, resumeline);
-
-err:
- return rc;
-}
-
-/*
- * The smbus doesn't always come back due to what is believed to be
- * hardware (power rail) bugs. For older models where this is known to
- * occur, our solution is to attempt to wait for the bus to stabilize;
- * if it doesn't happen, cut power to the dcon, repower it, and wait
- * for the bus to stabilize. Rinse, repeat until we have a working
- * smbus. For newer models, we simply BUG(); we want to know if this
- * still happens despite the power fixes that have been made!
- */
-static int dcon_bus_stabilize(struct dcon_priv *dcon, int is_powered_down)
-{
- unsigned long timeout;
- u8 pm;
- int x;
-
-power_up:
- if (is_powered_down) {
- pm = 1;
- x = olpc_ec_cmd(EC_DCON_POWER_MODE, &pm, 1, NULL, 0);
- if (x) {
- pr_warn("unable to force dcon to power up: %d!\n", x);
- return x;
- }
- usleep_range(10000, 11000); /* we'll be conservative */
- }
-
- pdata->bus_stabilize_wiggle();
-
- for (x = -1, timeout = 50; timeout && x < 0; timeout--) {
- usleep_range(1000, 1100);
- x = dcon_read(dcon, DCON_REG_ID);
- }
- if (x < 0) {
- pr_err("unable to stabilize dcon's smbus, reasserting power and praying.\n");
- BUG_ON(olpc_board_at_least(olpc_board(0xc2)));
- pm = 0;
- olpc_ec_cmd(EC_DCON_POWER_MODE, &pm, 1, NULL, 0);
- msleep(100);
- is_powered_down = 1;
- goto power_up; /* argh, stupid hardware.. */
- }
-
- if (is_powered_down)
- return dcon_hw_init(dcon, 0);
- return 0;
-}
-
-static void dcon_set_backlight(struct dcon_priv *dcon, u8 level)
-{
- dcon->bl_val = level;
- dcon_write(dcon, DCON_REG_BRIGHT, dcon->bl_val);
-
- /* Purposely turn off the backlight when we go to level 0 */
- if (dcon->bl_val == 0) {
- dcon->disp_mode &= ~MODE_BL_ENABLE;
- dcon_write(dcon, DCON_REG_MODE, dcon->disp_mode);
- } else if (!(dcon->disp_mode & MODE_BL_ENABLE)) {
- dcon->disp_mode |= MODE_BL_ENABLE;
- dcon_write(dcon, DCON_REG_MODE, dcon->disp_mode);
- }
-}
-
-/* Set the output type to either color or mono */
-static int dcon_set_mono_mode(struct dcon_priv *dcon, bool enable_mono)
-{
- if (dcon->mono == enable_mono)
- return 0;
-
- dcon->mono = enable_mono;
-
- if (enable_mono) {
- dcon->disp_mode &= ~(MODE_CSWIZZLE | MODE_COL_AA);
- dcon->disp_mode |= MODE_MONO_LUMA;
- } else {
- dcon->disp_mode &= ~(MODE_MONO_LUMA);
- dcon->disp_mode |= MODE_CSWIZZLE | MODE_COL_AA;
- }
-
- dcon_write(dcon, DCON_REG_MODE, dcon->disp_mode);
- return 0;
-}
-
-/* For now, this will be really stupid - we need to address how
- * DCONLOAD works in a sleep and account for it accordingly
- */
-
-static void dcon_sleep(struct dcon_priv *dcon, bool sleep)
-{
- int x;
-
- /* Turn off the backlight and put the DCON to sleep */
-
- if (dcon->asleep == sleep)
- return;
-
- if (!olpc_board_at_least(olpc_board(0xc2)))
- return;
-
- if (sleep) {
- u8 pm = 0;
-
- x = olpc_ec_cmd(EC_DCON_POWER_MODE, &pm, 1, NULL, 0);
- if (x)
- pr_warn("unable to force dcon to power down: %d!\n", x);
- else
- dcon->asleep = sleep;
- } else {
- /* Only re-enable the backlight if the backlight value is set */
- if (dcon->bl_val != 0)
- dcon->disp_mode |= MODE_BL_ENABLE;
- x = dcon_bus_stabilize(dcon, 1);
- if (x)
- pr_warn("unable to reinit dcon hardware: %d!\n", x);
- else
- dcon->asleep = sleep;
-
- /* Restore backlight */
- dcon_set_backlight(dcon, dcon->bl_val);
- }
-
- /* We should turn off some stuff in the framebuffer - but what? */
-}
-
-/* the DCON seems to get confused if we change DCONLOAD too
- * frequently -- i.e., approximately faster than frame time.
- * normally we don't change it this fast, so in general we won't
- * delay here.
- */
-static void dcon_load_holdoff(struct dcon_priv *dcon)
-{
- ktime_t delta_t, now;
-
- while (1) {
- now = ktime_get();
- delta_t = ktime_sub(now, dcon->load_time);
- if (ktime_to_ns(delta_t) > NSEC_PER_MSEC * 20)
- break;
- mdelay(4);
- }
-}
-
-static bool dcon_blank_fb(struct dcon_priv *dcon, bool blank)
-{
- int err;
-
- console_lock();
- lock_fb_info(dcon->fbinfo);
-
- dcon->ignore_fb_events = true;
- err = fb_blank(dcon->fbinfo,
- blank ? FB_BLANK_POWERDOWN : FB_BLANK_UNBLANK);
- dcon->ignore_fb_events = false;
- unlock_fb_info(dcon->fbinfo);
- console_unlock();
-
- if (err) {
- dev_err(&dcon->client->dev, "couldn't %sblank framebuffer\n",
- blank ? "" : "un");
- return false;
- }
- return true;
-}
-
-/* Set the source of the display (CPU or DCON) */
-static void dcon_source_switch(struct work_struct *work)
-{
- struct dcon_priv *dcon = container_of(work, struct dcon_priv,
- switch_source);
- int source = dcon->pending_src;
-
- if (dcon->curr_src == source)
- return;
-
- dcon_load_holdoff(dcon);
-
- dcon->switched = false;
-
- switch (source) {
- case DCON_SOURCE_CPU:
- pr_info("%s to CPU\n", __func__);
- /* Enable the scanline interrupt bit */
- if (dcon_write(dcon, DCON_REG_MODE,
- dcon->disp_mode | MODE_SCAN_INT))
- pr_err("couldn't enable scanline interrupt!\n");
- else
- /* Wait up to one second for the scanline interrupt */
- wait_event_timeout(dcon->waitq, dcon->switched, HZ);
-
- if (!dcon->switched)
- pr_err("Timeout entering CPU mode; expect a screen glitch.\n");
-
- /* Turn off the scanline interrupt */
- if (dcon_write(dcon, DCON_REG_MODE, dcon->disp_mode))
- pr_err("couldn't disable scanline interrupt!\n");
-
- /*
- * Ideally we'd like to disable interrupts here so that the
- * fb unblanking and DCON turn on happen at a known time value;
- * however, we can't do that right now with fb_blank
- * messing with semaphores.
- *
- * For now, we just hope..
- */
- if (!dcon_blank_fb(dcon, false)) {
- pr_err("Failed to enter CPU mode\n");
- dcon->pending_src = DCON_SOURCE_DCON;
- return;
- }
-
- /* And turn off the DCON */
- pdata->set_dconload(1);
- dcon->load_time = ktime_get();
-
- pr_info("The CPU has control\n");
- break;
- case DCON_SOURCE_DCON:
- {
- ktime_t delta_t;
-
- pr_info("%s to DCON\n", __func__);
-
- /* Clear DCONLOAD - this implies that the DCON is in control */
- pdata->set_dconload(0);
- dcon->load_time = ktime_get();
-
- wait_event_timeout(dcon->waitq, dcon->switched, HZ / 2);
-
- if (!dcon->switched) {
- pr_err("Timeout entering DCON mode; expect a screen glitch.\n");
- } else {
- /* sometimes the DCON doesn't follow its own rules,
- * and doesn't wait for two vsync pulses before
- * ack'ing the frame load with an IRQ. the result
- * is that the display shows the *previously*
- * loaded frame. we can detect this by looking at
- * the time between asserting DCONLOAD and the IRQ --
- * if it's less than 20msec, then the DCON couldn't
- * have seen two VSYNC pulses. in that case we
- * deassert and reassert, and hope for the best.
- * see http://dev.laptop.org/ticket/9664
- */
- delta_t = ktime_sub(dcon->irq_time, dcon->load_time);
- if (dcon->switched && ktime_to_ns(delta_t)
- < NSEC_PER_MSEC * 20) {
- pr_err("missed loading, retrying\n");
- pdata->set_dconload(1);
- mdelay(41);
- pdata->set_dconload(0);
- dcon->load_time = ktime_get();
- mdelay(41);
- }
- }
-
- dcon_blank_fb(dcon, true);
- pr_info("The DCON has control\n");
- break;
- }
- default:
- BUG();
- }
-
- dcon->curr_src = source;
-}
-
-static void dcon_set_source(struct dcon_priv *dcon, int arg)
-{
- if (dcon->pending_src == arg)
- return;
-
- dcon->pending_src = arg;
-
- if (dcon->curr_src != arg)
- schedule_work(&dcon->switch_source);
-}
-
-static void dcon_set_source_sync(struct dcon_priv *dcon, int arg)
-{
- dcon_set_source(dcon, arg);
- flush_work(&dcon->switch_source);
-}
-
-static ssize_t dcon_mode_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct dcon_priv *dcon = dev_get_drvdata(dev);
-
- return sprintf(buf, "%4.4X\n", dcon->disp_mode);
-}
-
-static ssize_t dcon_sleep_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct dcon_priv *dcon = dev_get_drvdata(dev);
-
- return sprintf(buf, "%d\n", dcon->asleep);
-}
-
-static ssize_t dcon_freeze_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct dcon_priv *dcon = dev_get_drvdata(dev);
-
- return sprintf(buf, "%d\n", dcon->curr_src == DCON_SOURCE_DCON ? 1 : 0);
-}
-
-static ssize_t dcon_mono_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct dcon_priv *dcon = dev_get_drvdata(dev);
-
- return sprintf(buf, "%d\n", dcon->mono);
-}
-
-static ssize_t dcon_resumeline_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- return sprintf(buf, "%d\n", resumeline);
-}
-
-static ssize_t dcon_mono_store(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t count)
-{
- unsigned long enable_mono;
- int rc;
-
- rc = kstrtoul(buf, 10, &enable_mono);
- if (rc)
- return rc;
-
- dcon_set_mono_mode(dev_get_drvdata(dev), enable_mono ? true : false);
-
- return count;
-}
-
-static ssize_t dcon_freeze_store(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t count)
-{
- struct dcon_priv *dcon = dev_get_drvdata(dev);
- unsigned long output;
- int ret;
-
- ret = kstrtoul(buf, 10, &output);
- if (ret)
- return ret;
-
- switch (output) {
- case 0:
- dcon_set_source(dcon, DCON_SOURCE_CPU);
- break;
- case 1:
- dcon_set_source_sync(dcon, DCON_SOURCE_DCON);
- break;
- case 2: /* normally unused */
- dcon_set_source(dcon, DCON_SOURCE_DCON);
- break;
- default:
- return -EINVAL;
- }
-
- return count;
-}
-
-static ssize_t dcon_resumeline_store(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t count)
-{
- unsigned short rl;
- int rc;
-
- rc = kstrtou16(buf, 10, &rl);
- if (rc)
- return rc;
-
- resumeline = rl;
- dcon_write(dev_get_drvdata(dev), DCON_REG_SCAN_INT, resumeline);
-
- return count;
-}
-
-static ssize_t dcon_sleep_store(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t count)
-{
- unsigned long output;
- int ret;
-
- ret = kstrtoul(buf, 10, &output);
- if (ret)
- return ret;
-
- dcon_sleep(dev_get_drvdata(dev), output ? true : false);
- return count;
-}
-
-static struct device_attribute dcon_device_files[] = {
- __ATTR(mode, 0444, dcon_mode_show, NULL),
- __ATTR(sleep, 0644, dcon_sleep_show, dcon_sleep_store),
- __ATTR(freeze, 0644, dcon_freeze_show, dcon_freeze_store),
- __ATTR(monochrome, 0644, dcon_mono_show, dcon_mono_store),
- __ATTR(resumeline, 0644, dcon_resumeline_show, dcon_resumeline_store),
-};
-
-static int dcon_bl_update(struct backlight_device *dev)
-{
- struct dcon_priv *dcon = bl_get_data(dev);
- u8 level = backlight_get_brightness(dev) & 0x0F;
-
- if (level != dcon->bl_val)
- dcon_set_backlight(dcon, level);
-
- /* power down the DCON when the screen is blanked */
- if (!dcon->ignore_fb_events)
- dcon_sleep(dcon, !!(dev->props.state & BL_CORE_FBBLANK));
-
- return 0;
-}
-
-static int dcon_bl_get(struct backlight_device *dev)
-{
- struct dcon_priv *dcon = bl_get_data(dev);
-
- return dcon->bl_val;
-}
-
-static const struct backlight_ops dcon_bl_ops = {
- .update_status = dcon_bl_update,
- .get_brightness = dcon_bl_get,
-};
-
-static struct backlight_properties dcon_bl_props = {
- .max_brightness = 15,
- .type = BACKLIGHT_RAW,
- .power = BACKLIGHT_POWER_ON,
-};
-
-static int dcon_reboot_notify(struct notifier_block *nb,
- unsigned long foo, void *bar)
-{
- struct dcon_priv *dcon = container_of(nb, struct dcon_priv, reboot_nb);
-
- if (!dcon || !dcon->client)
- return NOTIFY_DONE;
-
- /* Turn off the DCON. Entirely. */
- dcon_write(dcon, DCON_REG_MODE, 0x39);
- dcon_write(dcon, DCON_REG_MODE, 0x32);
- return NOTIFY_DONE;
-}
-
-static int unfreeze_on_panic(struct notifier_block *nb,
- unsigned long e, void *p)
-{
- pdata->set_dconload(1);
- return NOTIFY_DONE;
-}
-
-static struct notifier_block dcon_panic_nb = {
- .notifier_call = unfreeze_on_panic,
-};
-
-static int dcon_detect(struct i2c_client *client, struct i2c_board_info *info)
-{
- strscpy(info->type, "olpc_dcon", I2C_NAME_SIZE);
-
- return 0;
-}
-
-static int dcon_probe(struct i2c_client *client)
-{
- struct dcon_priv *dcon;
- int rc, i, j;
-
- if (!pdata)
- return -ENXIO;
-
- dcon = kzalloc(sizeof(*dcon), GFP_KERNEL);
- if (!dcon)
- return -ENOMEM;
-
- dcon->client = client;
- init_waitqueue_head(&dcon->waitq);
- INIT_WORK(&dcon->switch_source, dcon_source_switch);
- dcon->reboot_nb.notifier_call = dcon_reboot_notify;
- dcon->reboot_nb.priority = -1;
-
- i2c_set_clientdata(client, dcon);
-
- if (num_registered_fb < 1) {
- dev_err(&client->dev, "DCON driver requires a registered fb\n");
- rc = -EIO;
- goto einit;
- }
- dcon->fbinfo = registered_fb[0];
-
- rc = dcon_hw_init(dcon, 1);
- if (rc)
- goto einit;
-
- /* Add the DCON device */
-
- dcon_device = platform_device_alloc("dcon", -1);
-
- if (!dcon_device) {
- pr_err("Unable to create the DCON device\n");
- rc = -ENOMEM;
- goto eirq;
- }
- rc = platform_device_add(dcon_device);
- platform_set_drvdata(dcon_device, dcon);
-
- if (rc) {
- pr_err("Unable to add the DCON device\n");
- goto edev;
- }
-
- for (i = 0; i < ARRAY_SIZE(dcon_device_files); i++) {
- rc = device_create_file(&dcon_device->dev,
- &dcon_device_files[i]);
- if (rc) {
- dev_err(&dcon_device->dev, "Cannot create sysfs file\n");
- goto ecreate;
- }
- }
-
- dcon->bl_val = dcon_read(dcon, DCON_REG_BRIGHT) & 0x0F;
-
- /* Add the backlight device for the DCON */
- dcon_bl_props.brightness = dcon->bl_val;
- dcon->bl_dev = backlight_device_register("dcon-bl", &dcon_device->dev,
- dcon, &dcon_bl_ops,
- &dcon_bl_props);
- if (IS_ERR(dcon->bl_dev)) {
- dev_err(&client->dev, "cannot register backlight dev (%ld)\n",
- PTR_ERR(dcon->bl_dev));
- dcon->bl_dev = NULL;
- }
-
- register_reboot_notifier(&dcon->reboot_nb);
- atomic_notifier_chain_register(&panic_notifier_list, &dcon_panic_nb);
-
- return 0;
-
- ecreate:
- for (j = 0; j < i; j++)
- device_remove_file(&dcon_device->dev, &dcon_device_files[j]);
- platform_device_del(dcon_device);
- edev:
- platform_device_put(dcon_device);
- dcon_device = NULL;
- eirq:
- free_irq(DCON_IRQ, dcon);
- einit:
- kfree(dcon);
- return rc;
-}
-
-static void dcon_remove(struct i2c_client *client)
-{
- struct dcon_priv *dcon = i2c_get_clientdata(client);
-
- unregister_reboot_notifier(&dcon->reboot_nb);
- atomic_notifier_chain_unregister(&panic_notifier_list, &dcon_panic_nb);
-
- free_irq(DCON_IRQ, dcon);
-
- backlight_device_unregister(dcon->bl_dev);
-
- if (dcon_device)
- platform_device_unregister(dcon_device);
- cancel_work_sync(&dcon->switch_source);
-
- kfree(dcon);
-}
-
-#ifdef CONFIG_PM
-static int dcon_suspend(struct device *dev)
-{
- struct i2c_client *client = to_i2c_client(dev);
- struct dcon_priv *dcon = i2c_get_clientdata(client);
-
- if (!dcon->asleep) {
- /* Set up the DCON to have the source */
- dcon_set_source_sync(dcon, DCON_SOURCE_DCON);
- }
-
- return 0;
-}
-
-static int dcon_resume(struct device *dev)
-{
- struct i2c_client *client = to_i2c_client(dev);
- struct dcon_priv *dcon = i2c_get_clientdata(client);
-
- if (!dcon->asleep) {
- dcon_bus_stabilize(dcon, 0);
- dcon_set_source(dcon, DCON_SOURCE_CPU);
- }
-
- return 0;
-}
-
-#else
-
-#define dcon_suspend NULL
-#define dcon_resume NULL
-
-#endif /* CONFIG_PM */
-
-irqreturn_t dcon_interrupt(int irq, void *id)
-{
- struct dcon_priv *dcon = id;
- u8 status;
-
- if (pdata->read_status(&status))
- return IRQ_NONE;
-
- switch (status & 3) {
- case 3:
- pr_debug("DCONLOAD_MISSED interrupt\n");
- break;
-
- case 2: /* switch to DCON mode */
- case 1: /* switch to CPU mode */
- dcon->switched = true;
- dcon->irq_time = ktime_get();
- wake_up(&dcon->waitq);
- break;
-
- case 0:
- /* workaround resume case: the DCON (on 1.5) doesn't
- * ever assert status 0x01 when switching to CPU mode
- * during resume. this is because DCONLOAD is de-asserted
- * _immediately_ upon exiting S3, so the actual release
- * of the DCON happened long before this point.
- * see http://dev.laptop.org/ticket/9869
- */
- if (dcon->curr_src != dcon->pending_src && !dcon->switched) {
- dcon->switched = true;
- dcon->irq_time = ktime_get();
- wake_up(&dcon->waitq);
- pr_debug("switching w/ status 0/0\n");
- } else {
- pr_debug("scanline interrupt w/CPU\n");
- }
- }
-
- return IRQ_HANDLED;
-}
-
-static const struct dev_pm_ops dcon_pm_ops = {
- .suspend = dcon_suspend,
- .resume = dcon_resume,
-};
-
-static const struct i2c_device_id dcon_idtable[] = {
- { "olpc_dcon" },
- { }
-};
-MODULE_DEVICE_TABLE(i2c, dcon_idtable);
-
-static struct i2c_driver dcon_driver = {
- .driver = {
- .name = "olpc_dcon",
- .pm = &dcon_pm_ops,
- },
- .class = I2C_CLASS_HWMON,
- .id_table = dcon_idtable,
- .probe = dcon_probe,
- .remove = dcon_remove,
- .detect = dcon_detect,
- .address_list = normal_i2c,
-};
-
-static int __init olpc_dcon_init(void)
-{
- /* XO-1.5 */
- if (olpc_board_at_least(olpc_board(0xd0)))
- pdata = &dcon_pdata_xo_1_5;
- else
- pdata = &dcon_pdata_xo_1;
-
- return i2c_add_driver(&dcon_driver);
-}
-
-static void __exit olpc_dcon_exit(void)
-{
- i2c_del_driver(&dcon_driver);
-}
-
-module_init(olpc_dcon_init);
-module_exit(olpc_dcon_exit);
-
-MODULE_LICENSE("GPL");
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Mainly by David Woodhouse, somewhat modified by Jordan Crouse
- *
- * Copyright © 2006-2007 Red Hat, Inc.
- * Copyright © 2006-2007 Advanced Micro Devices, Inc.
- * Copyright © 2009 VIA Technology, Inc.
- * Copyright (c) 2010 Andres Salomon <dilinger@queued.net>
- */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/cs5535.h>
-#include <linux/gpio/consumer.h>
-#include <linux/delay.h>
-#include <linux/i2c.h>
-#include <asm/olpc.h>
-
-#include "olpc_dcon.h"
-
-enum dcon_gpios {
- OLPC_DCON_STAT0,
- OLPC_DCON_STAT1,
- OLPC_DCON_IRQ,
- OLPC_DCON_LOAD,
- OLPC_DCON_BLANK,
-};
-
-static const struct dcon_gpio gpios_asis[] = {
- [OLPC_DCON_STAT0] = { .name = "dcon_stat0", .flags = GPIOD_ASIS },
- [OLPC_DCON_STAT1] = { .name = "dcon_stat1", .flags = GPIOD_ASIS },
- [OLPC_DCON_IRQ] = { .name = "dcon_irq", .flags = GPIOD_ASIS },
- [OLPC_DCON_LOAD] = { .name = "dcon_load", .flags = GPIOD_ASIS },
- [OLPC_DCON_BLANK] = { .name = "dcon_blank", .flags = GPIOD_ASIS },
-};
-
-static struct gpio_desc *gpios[5];
-
-static int dcon_init_xo_1(struct dcon_priv *dcon)
-{
- unsigned char lob;
- int ret, i;
- const struct dcon_gpio *pin = &gpios_asis[0];
-
- for (i = 0; i < ARRAY_SIZE(gpios_asis); i++) {
- gpios[i] = devm_gpiod_get(&dcon->client->dev, pin[i].name,
- pin[i].flags);
- if (IS_ERR(gpios[i])) {
- ret = PTR_ERR(gpios[i]);
- pr_err("failed to request %s GPIO: %d\n", pin[i].name,
- ret);
- return ret;
- }
- }
-
- /* Turn off the event enable for GPIO7 just to be safe */
- cs5535_gpio_clear(OLPC_GPIO_DCON_IRQ, GPIO_EVENTS_ENABLE);
-
- /*
- * Determine the current state by reading the GPIO bit; earlier
- * stages of the boot process have established the state.
- *
- * Note that we read GPIO_OUTPUT_VAL rather than GPIO_READ_BACK here;
- * this is because OFW will disable input for the pin and set a value..
- * READ_BACK will only contain a valid value if input is enabled and
- * then a value is set. So, future readings of the pin can use
- * READ_BACK, but the first one cannot. Awesome, huh?
- */
- dcon->curr_src = cs5535_gpio_isset(OLPC_GPIO_DCON_LOAD, GPIO_OUTPUT_VAL)
- ? DCON_SOURCE_CPU
- : DCON_SOURCE_DCON;
- dcon->pending_src = dcon->curr_src;
-
- /* Set the directions for the GPIO pins */
- gpiod_direction_input(gpios[OLPC_DCON_STAT0]);
- gpiod_direction_input(gpios[OLPC_DCON_STAT1]);
- gpiod_direction_input(gpios[OLPC_DCON_IRQ]);
- gpiod_direction_input(gpios[OLPC_DCON_BLANK]);
- gpiod_direction_output(gpios[OLPC_DCON_LOAD],
- dcon->curr_src == DCON_SOURCE_CPU);
-
- /* Set up the interrupt mappings */
-
- /* Set the IRQ to pair 2 */
- cs5535_gpio_setup_event(OLPC_GPIO_DCON_IRQ, 2, 0);
-
- /* Enable group 2 to trigger the DCON interrupt */
- cs5535_gpio_set_irq(2, DCON_IRQ);
-
- /* Select edge level for interrupt (in PIC) */
- lob = inb(0x4d0);
- lob &= ~(1 << DCON_IRQ);
- outb(lob, 0x4d0);
-
- /* Register the interrupt handler */
- if (request_irq(DCON_IRQ, &dcon_interrupt, 0, "DCON", dcon)) {
- pr_err("failed to request DCON's irq\n");
- return -EIO;
- }
-
- /* Clear INV_EN for GPIO7 (DCONIRQ) */
- cs5535_gpio_clear(OLPC_GPIO_DCON_IRQ, GPIO_INPUT_INVERT);
-
- /* Enable filter for GPIO12 (DCONBLANK) */
- cs5535_gpio_set(OLPC_GPIO_DCON_BLANK, GPIO_INPUT_FILTER);
-
- /* Disable filter for GPIO7 */
- cs5535_gpio_clear(OLPC_GPIO_DCON_IRQ, GPIO_INPUT_FILTER);
-
- /* Disable event counter for GPIO7 (DCONIRQ) and GPIO12 (DCONBLANK) */
- cs5535_gpio_clear(OLPC_GPIO_DCON_IRQ, GPIO_INPUT_EVENT_COUNT);
- cs5535_gpio_clear(OLPC_GPIO_DCON_BLANK, GPIO_INPUT_EVENT_COUNT);
-
- /* Add GPIO12 to the Filter Event Pair #7 */
- cs5535_gpio_set(OLPC_GPIO_DCON_BLANK, GPIO_FE7_SEL);
-
- /* Turn off negative Edge Enable for GPIO12 */
- cs5535_gpio_clear(OLPC_GPIO_DCON_BLANK, GPIO_NEGATIVE_EDGE_EN);
-
- /* Enable negative Edge Enable for GPIO7 */
- cs5535_gpio_set(OLPC_GPIO_DCON_IRQ, GPIO_NEGATIVE_EDGE_EN);
-
- /* Zero the filter amount for Filter Event Pair #7 */
- cs5535_gpio_set(0, GPIO_FLTR7_AMOUNT);
-
- /* Clear the negative edge status for GPIO7 and GPIO12 */
- cs5535_gpio_set(OLPC_GPIO_DCON_IRQ, GPIO_NEGATIVE_EDGE_STS);
- cs5535_gpio_set(OLPC_GPIO_DCON_BLANK, GPIO_NEGATIVE_EDGE_STS);
-
- /* FIXME: Clear the positive status as well, just to be sure */
- cs5535_gpio_set(OLPC_GPIO_DCON_IRQ, GPIO_POSITIVE_EDGE_STS);
- cs5535_gpio_set(OLPC_GPIO_DCON_BLANK, GPIO_POSITIVE_EDGE_STS);
-
- /* Enable events for GPIO7 (DCONIRQ) and GPIO12 (DCONBLANK) */
- cs5535_gpio_set(OLPC_GPIO_DCON_IRQ, GPIO_EVENTS_ENABLE);
- cs5535_gpio_set(OLPC_GPIO_DCON_BLANK, GPIO_EVENTS_ENABLE);
-
- return 0;
-}
-
-static void dcon_wiggle_xo_1(void)
-{
- int x;
-
- /*
- * According to HiMax, when powering the DCON up we should hold
- * SMB_DATA high for 8 SMB_CLK cycles. This will force the DCON
- * state machine to reset to a (sane) initial state. Mitch Bradley
- * did some testing and discovered that holding for 16 SMB_CLK cycles
- * worked a lot more reliably, so that's what we do here.
- *
- * According to the cs5536 spec, to set GPIO14 to SMB_CLK we must
- * simultaneously set AUX1 IN/OUT to GPIO14; ditto for SMB_DATA and
- * GPIO15.
- */
- cs5535_gpio_set(OLPC_GPIO_SMB_CLK, GPIO_OUTPUT_VAL);
- cs5535_gpio_set(OLPC_GPIO_SMB_DATA, GPIO_OUTPUT_VAL);
- cs5535_gpio_set(OLPC_GPIO_SMB_CLK, GPIO_OUTPUT_ENABLE);
- cs5535_gpio_set(OLPC_GPIO_SMB_DATA, GPIO_OUTPUT_ENABLE);
- cs5535_gpio_clear(OLPC_GPIO_SMB_CLK, GPIO_OUTPUT_AUX1);
- cs5535_gpio_clear(OLPC_GPIO_SMB_DATA, GPIO_OUTPUT_AUX1);
- cs5535_gpio_clear(OLPC_GPIO_SMB_CLK, GPIO_OUTPUT_AUX2);
- cs5535_gpio_clear(OLPC_GPIO_SMB_DATA, GPIO_OUTPUT_AUX2);
- cs5535_gpio_clear(OLPC_GPIO_SMB_CLK, GPIO_INPUT_AUX1);
- cs5535_gpio_clear(OLPC_GPIO_SMB_DATA, GPIO_INPUT_AUX1);
-
- for (x = 0; x < 16; x++) {
- udelay(5);
- cs5535_gpio_clear(OLPC_GPIO_SMB_CLK, GPIO_OUTPUT_VAL);
- udelay(5);
- cs5535_gpio_set(OLPC_GPIO_SMB_CLK, GPIO_OUTPUT_VAL);
- }
- udelay(5);
- cs5535_gpio_set(OLPC_GPIO_SMB_CLK, GPIO_OUTPUT_AUX1);
- cs5535_gpio_set(OLPC_GPIO_SMB_DATA, GPIO_OUTPUT_AUX1);
- cs5535_gpio_set(OLPC_GPIO_SMB_CLK, GPIO_INPUT_AUX1);
- cs5535_gpio_set(OLPC_GPIO_SMB_DATA, GPIO_INPUT_AUX1);
-}
-
-static void dcon_set_dconload_1(int val)
-{
- gpiod_set_value(gpios[OLPC_DCON_LOAD], val);
-}
-
-static int dcon_read_status_xo_1(u8 *status)
-{
- *status = gpiod_get_value(gpios[OLPC_DCON_STAT0]);
- *status |= gpiod_get_value(gpios[OLPC_DCON_STAT1]) << 1;
-
- /* Clear the negative edge status for GPIO7 */
- cs5535_gpio_set(OLPC_GPIO_DCON_IRQ, GPIO_NEGATIVE_EDGE_STS);
-
- return 0;
-}
-
-struct dcon_platform_data dcon_pdata_xo_1 = {
- .init = dcon_init_xo_1,
- .bus_stabilize_wiggle = dcon_wiggle_xo_1,
- .set_dconload = dcon_set_dconload_1,
- .read_status = dcon_read_status_xo_1,
-};
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Copyright (c) 2009,2010 One Laptop per Child
- */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/acpi.h>
-#include <linux/delay.h>
-#include <linux/i2c.h>
-#include <linux/gpio/consumer.h>
-#include <linux/gpio/machine.h>
-#include <asm/olpc.h>
-
-/* TODO: this eventually belongs in linux/vx855.h */
-#define NR_VX855_GPI 14
-#define NR_VX855_GPO 13
-#define NR_VX855_GPIO 15
-
-#define VX855_GPI(n) (n)
-#define VX855_GPO(n) (NR_VX855_GPI + (n))
-#define VX855_GPIO(n) (NR_VX855_GPI + NR_VX855_GPO + (n))
-
-#include "olpc_dcon.h"
-
-/* Hardware setup on the XO 1.5:
- * DCONLOAD connects to VX855_GPIO1 (not SMBCK2)
- * DCONBLANK connects to VX855_GPIO8 (not SSPICLK) unused in driver
- * DCONSTAT0 connects to VX855_GPI10 (not SSPISDI)
- * DCONSTAT1 connects to VX855_GPI11 (not nSSPISS)
- * DCONIRQ connects to VX855_GPIO12
- * DCONSMBDATA connects to VX855 graphics CRTSPD
- * DCONSMBCLK connects to VX855 graphics CRTSPCLK
- */
-
-#define VX855_GENL_PURPOSE_OUTPUT 0x44c /* PMIO_Rx4c-4f */
-#define VX855_GPI_STATUS_CHG 0x450 /* PMIO_Rx50 */
-#define VX855_GPI_SCI_SMI 0x452 /* PMIO_Rx52 */
-#define BIT_GPIO12 0x40
-
-#define PREFIX "OLPC DCON:"
-
-enum dcon_gpios {
- OLPC_DCON_STAT0,
- OLPC_DCON_STAT1,
- OLPC_DCON_LOAD,
-};
-
-struct gpiod_lookup_table gpios_table = {
- .dev_id = NULL,
- .table = {
- GPIO_LOOKUP("VX855 South Bridge", VX855_GPIO(1), "dcon_load",
- GPIO_ACTIVE_LOW),
- GPIO_LOOKUP("VX855 South Bridge", VX855_GPI(10), "dcon_stat0",
- GPIO_ACTIVE_LOW),
- GPIO_LOOKUP("VX855 South Bridge", VX855_GPI(11), "dcon_stat1",
- GPIO_ACTIVE_LOW),
- { },
- },
-};
-
-static const struct dcon_gpio gpios_asis[] = {
- [OLPC_DCON_STAT0] = { .name = "dcon_stat0", .flags = GPIOD_ASIS },
- [OLPC_DCON_STAT1] = { .name = "dcon_stat1", .flags = GPIOD_ASIS },
- [OLPC_DCON_LOAD] = { .name = "dcon_load", .flags = GPIOD_ASIS },
-};
-
-static struct gpio_desc *gpios[3];
-
-static void dcon_clear_irq(void)
-{
- /* irq status will appear in PMIO_Rx50[6] (RW1C) on gpio12 */
- outb(BIT_GPIO12, VX855_GPI_STATUS_CHG);
-}
-
-static int dcon_was_irq(void)
-{
- u8 tmp;
-
- /* irq status will appear in PMIO_Rx50[6] on gpio12 */
- tmp = inb(VX855_GPI_STATUS_CHG);
-
- return !!(tmp & BIT_GPIO12);
-}
-
-static int dcon_init_xo_1_5(struct dcon_priv *dcon)
-{
- unsigned int irq;
- const struct dcon_gpio *pin = &gpios_asis[0];
- int i;
- int ret;
-
- /* Add GPIO look up table */
- gpios_table.dev_id = dev_name(&dcon->client->dev);
- gpiod_add_lookup_table(&gpios_table);
-
- /* Get GPIO descriptor */
- for (i = 0; i < ARRAY_SIZE(gpios_asis); i++) {
- gpios[i] = devm_gpiod_get(&dcon->client->dev, pin[i].name,
- pin[i].flags);
- if (IS_ERR(gpios[i])) {
- ret = PTR_ERR(gpios[i]);
- pr_err("failed to request %s GPIO: %d\n", pin[i].name,
- ret);
- return ret;
- }
- }
-
- dcon_clear_irq();
-
- /* set PMIO_Rx52[6] to enable SCI/SMI on gpio12 */
- outb(inb(VX855_GPI_SCI_SMI) | BIT_GPIO12, VX855_GPI_SCI_SMI);
-
- /* Determine the current state of DCONLOAD, likely set by firmware */
- /* GPIO1 */
- dcon->curr_src = (inl(VX855_GENL_PURPOSE_OUTPUT) & 0x1000) ?
- DCON_SOURCE_CPU : DCON_SOURCE_DCON;
- dcon->pending_src = dcon->curr_src;
-
- /* we're sharing the IRQ with ACPI */
- irq = acpi_gbl_FADT.sci_interrupt;
- if (request_irq(irq, &dcon_interrupt, IRQF_SHARED, "DCON", dcon)) {
- pr_err("DCON (IRQ%d) allocation failed\n", irq);
- return 1;
- }
-
- return 0;
-}
-
-static void set_i2c_line(int sda, int scl)
-{
- unsigned char tmp;
- unsigned int port = 0x26;
-
- /* FIXME: This directly accesses the CRT GPIO controller !!! */
- outb(port, 0x3c4);
- tmp = inb(0x3c5);
-
- if (scl)
- tmp |= 0x20;
- else
- tmp &= ~0x20;
-
- if (sda)
- tmp |= 0x10;
- else
- tmp &= ~0x10;
-
- tmp |= 0x01;
-
- outb(port, 0x3c4);
- outb(tmp, 0x3c5);
-}
-
-static void dcon_wiggle_xo_1_5(void)
-{
- int x;
-
- /*
- * According to HiMax, when powering the DCON up we should hold
- * SMB_DATA high for 8 SMB_CLK cycles. This will force the DCON
- * state machine to reset to a (sane) initial state. Mitch Bradley
- * did some testing and discovered that holding for 16 SMB_CLK cycles
- * worked a lot more reliably, so that's what we do here.
- */
- set_i2c_line(1, 1);
-
- for (x = 0; x < 16; x++) {
- udelay(5);
- set_i2c_line(1, 0);
- udelay(5);
- set_i2c_line(1, 1);
- }
- udelay(5);
-
- /* set PMIO_Rx52[6] to enable SCI/SMI on gpio12 */
- outb(inb(VX855_GPI_SCI_SMI) | BIT_GPIO12, VX855_GPI_SCI_SMI);
-}
-
-static void dcon_set_dconload_xo_1_5(int val)
-{
- gpiod_set_value(gpios[OLPC_DCON_LOAD], val);
-}
-
-static int dcon_read_status_xo_1_5(u8 *status)
-{
- if (!dcon_was_irq())
- return -1;
-
- /* i believe this is the same as "inb(0x44b) & 3" */
- *status = gpiod_get_value(gpios[OLPC_DCON_STAT0]);
- *status |= gpiod_get_value(gpios[OLPC_DCON_STAT1]) << 1;
-
- dcon_clear_irq();
-
- return 0;
-}
-
-struct dcon_platform_data dcon_pdata_xo_1_5 = {
- .init = dcon_init_xo_1_5,
- .bus_stabilize_wiggle = dcon_wiggle_xo_1_5,
- .set_dconload = dcon_set_dconload_xo_1_5,
- .read_status = dcon_read_status_xo_1_5,
-};
projects / thirdparty / kernel / linux.git / commitdiff
