comment "SPI Master Controller Drivers"
config SPI_ALTERA
- tristate "Altera SPI Controller"
+ tristate "Altera SPI Controller platform driver"
+ select SPI_ALTERA_CORE
select REGMAP_MMIO
help
This is the driver for the Altera SPI Controller.
+config SPI_ALTERA_CORE
+ tristate "Altera SPI Controller core code"
+ select REGMAP
+ help
+ "The core code for the Altera SPI Controller"
+
config SPI_AR934X
tristate "Qualcomm Atheros AR934X/QCA95XX SPI controller driver"
depends on ATH79 || COMPILE_TEST
obj-$(CONFIG_SPI_LOOPBACK_TEST) += spi-loopback-test.o
# SPI master controller drivers (bus)
-obj-$(CONFIG_SPI_ALTERA) += spi-altera.o
+obj-$(CONFIG_SPI_ALTERA) += spi-altera-platform.o
+obj-$(CONFIG_SPI_ALTERA_CORE) += spi-altera-core.o
obj-$(CONFIG_SPI_AR934X) += spi-ar934x.o
obj-$(CONFIG_SPI_ARMADA_3700) += spi-armada-3700.o
obj-$(CONFIG_SPI_ATMEL) += spi-atmel.o
* Ben Dooks <ben@simtec.co.uk>
*/
-#include <linux/interrupt.h>
#include <linux/errno.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#define ALTERA_SPI_CONTROL_IE_MSK 0x100
#define ALTERA_SPI_CONTROL_SSO_MSK 0x400
-#define ALTERA_SPI_MAX_CS 32
-
-enum altera_spi_type {
- ALTERA_SPI_TYPE_UNKNOWN,
- ALTERA_SPI_TYPE_SUBDEV,
-};
-
-struct altera_spi {
- int irq;
- int len;
- int count;
- int bytes_per_word;
- u32 imr;
-
- /* data buffers */
- const unsigned char *tx;
- unsigned char *rx;
-
- struct regmap *regmap;
- u32 regoff;
- struct device *dev;
-};
-
-static const struct regmap_config spi_altera_config = {
- .reg_bits = 32,
- .reg_stride = 4,
- .val_bits = 32,
- .fast_io = true,
-};
-
static int altr_spi_writel(struct altera_spi *hw, unsigned int reg,
unsigned int val)
{
return 0;
}
-static irqreturn_t altera_spi_irq(int irq, void *dev)
+irqreturn_t altera_spi_irq(int irq, void *dev)
{
struct spi_master *master = dev;
struct altera_spi *hw = spi_master_get_devdata(master);
return IRQ_HANDLED;
}
+EXPORT_SYMBOL_GPL(altera_spi_irq);
-static int altera_spi_probe(struct platform_device *pdev)
+void altera_spi_init_master(struct spi_master *master)
{
- const struct platform_device_id *platid = platform_get_device_id(pdev);
- struct altera_spi_platform_data *pdata = dev_get_platdata(&pdev->dev);
- enum altera_spi_type type = ALTERA_SPI_TYPE_UNKNOWN;
- struct altera_spi *hw;
- struct spi_master *master;
- int err = -ENODEV;
+ struct altera_spi *hw = spi_master_get_devdata(master);
u32 val;
- u16 i;
-
- master = spi_alloc_master(&pdev->dev, sizeof(struct altera_spi));
- if (!master)
- return err;
-
- /* setup the master state. */
- master->bus_num = pdev->id;
-
- if (pdata) {
- if (pdata->num_chipselect > ALTERA_SPI_MAX_CS) {
- dev_err(&pdev->dev,
- "Invalid number of chipselect: %hu\n",
- pdata->num_chipselect);
- err = -EINVAL;
- goto exit;
- }
- master->num_chipselect = pdata->num_chipselect;
- master->mode_bits = pdata->mode_bits;
- master->bits_per_word_mask = pdata->bits_per_word_mask;
- } else {
- master->num_chipselect = 16;
- master->mode_bits = SPI_CS_HIGH;
- master->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 16);
- }
-
- master->dev.of_node = pdev->dev.of_node;
master->transfer_one = altera_spi_txrx;
master->set_cs = altera_spi_set_cs;
- hw = spi_master_get_devdata(master);
- hw->dev = &pdev->dev;
-
- if (platid)
- type = platid->driver_data;
-
- /* find and map our resources */
- if (type == ALTERA_SPI_TYPE_SUBDEV) {
- struct resource *regoff;
-
- hw->regmap = dev_get_regmap(pdev->dev.parent, NULL);
- if (!hw->regmap) {
- dev_err(&pdev->dev, "get regmap failed\n");
- goto exit;
- }
-
- regoff = platform_get_resource(pdev, IORESOURCE_REG, 0);
- if (regoff)
- hw->regoff = regoff->start;
- } else {
- void __iomem *res;
-
- res = devm_platform_ioremap_resource(pdev, 0);
- if (IS_ERR(res)) {
- err = PTR_ERR(res);
- goto exit;
- }
-
- hw->regmap = devm_regmap_init_mmio(&pdev->dev, res,
- &spi_altera_config);
- if (IS_ERR(hw->regmap)) {
- dev_err(&pdev->dev, "regmap mmio init failed\n");
- err = PTR_ERR(hw->regmap);
- goto exit;
- }
- }
-
/* program defaults into the registers */
hw->imr = 0; /* disable spi interrupts */
altr_spi_writel(hw, ALTERA_SPI_CONTROL, hw->imr);
altr_spi_readl(hw, ALTERA_SPI_STATUS, &val);
if (val & ALTERA_SPI_STATUS_RRDY_MSK)
altr_spi_readl(hw, ALTERA_SPI_RXDATA, &val); /* flush rxdata */
- /* irq is optional */
- hw->irq = platform_get_irq(pdev, 0);
- if (hw->irq >= 0) {
- err = devm_request_irq(&pdev->dev, hw->irq, altera_spi_irq, 0,
- pdev->name, master);
- if (err)
- goto exit;
- }
-
- err = devm_spi_register_master(&pdev->dev, master);
- if (err)
- goto exit;
-
- if (pdata) {
- for (i = 0; i < pdata->num_devices; i++) {
- if (!spi_new_device(master, pdata->devices + i))
- dev_warn(&pdev->dev,
- "unable to create SPI device: %s\n",
- pdata->devices[i].modalias);
- }
- }
-
- dev_info(&pdev->dev, "regoff %u, irq %d\n", hw->regoff, hw->irq);
-
- return 0;
-exit:
- spi_master_put(master);
- return err;
}
+EXPORT_SYMBOL_GPL(altera_spi_init_master);
-#ifdef CONFIG_OF
-static const struct of_device_id altera_spi_match[] = {
- { .compatible = "ALTR,spi-1.0", },
- { .compatible = "altr,spi-1.0", },
- {},
-};
-MODULE_DEVICE_TABLE(of, altera_spi_match);
-#endif /* CONFIG_OF */
-
-static const struct platform_device_id altera_spi_ids[] = {
- { DRV_NAME, ALTERA_SPI_TYPE_UNKNOWN },
- { "subdev_spi_altera", ALTERA_SPI_TYPE_SUBDEV },
- { }
-};
-MODULE_DEVICE_TABLE(platform, altera_spi_ids);
-
-static struct platform_driver altera_spi_driver = {
- .probe = altera_spi_probe,
- .driver = {
- .name = DRV_NAME,
- .pm = NULL,
- .of_match_table = of_match_ptr(altera_spi_match),
- },
- .id_table = altera_spi_ids,
-};
-module_platform_driver(altera_spi_driver);
-
-MODULE_DESCRIPTION("Altera SPI driver");
-MODULE_AUTHOR("Thomas Chou <thomas@wytron.com.tw>");
MODULE_LICENSE("GPL");
-MODULE_ALIAS("platform:" DRV_NAME);
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Altera SPI driver
+ *
+ * Copyright (C) 2008 Thomas Chou <thomas@wytron.com.tw>
+ *
+ * Based on spi_s3c24xx.c, which is:
+ * Copyright (c) 2006 Ben Dooks
+ * Copyright (c) 2006 Simtec Electronics
+ * Ben Dooks <ben@simtec.co.uk>
+ */
+
+#include <linux/interrupt.h>
+#include <linux/errno.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/spi/altera.h>
+#include <linux/spi/spi.h>
+#include <linux/io.h>
+#include <linux/of.h>
+
+#define DRV_NAME "spi_altera"
+
+enum altera_spi_type {
+ ALTERA_SPI_TYPE_UNKNOWN,
+ ALTERA_SPI_TYPE_SUBDEV,
+};
+
+static const struct regmap_config spi_altera_config = {
+ .reg_bits = 32,
+ .reg_stride = 4,
+ .val_bits = 32,
+ .fast_io = true,
+};
+
+static int altera_spi_probe(struct platform_device *pdev)
+{
+ const struct platform_device_id *platid = platform_get_device_id(pdev);
+ struct altera_spi_platform_data *pdata = dev_get_platdata(&pdev->dev);
+ enum altera_spi_type type = ALTERA_SPI_TYPE_UNKNOWN;
+ struct altera_spi *hw;
+ struct spi_master *master;
+ int err = -ENODEV;
+ u16 i;
+
+ master = spi_alloc_master(&pdev->dev, sizeof(struct altera_spi));
+ if (!master)
+ return err;
+
+ /* setup the master state. */
+ master->bus_num = pdev->id;
+
+ if (pdata) {
+ if (pdata->num_chipselect > ALTERA_SPI_MAX_CS) {
+ dev_err(&pdev->dev,
+ "Invalid number of chipselect: %u\n",
+ pdata->num_chipselect);
+ err = -EINVAL;
+ goto exit;
+ }
+
+ master->num_chipselect = pdata->num_chipselect;
+ master->mode_bits = pdata->mode_bits;
+ master->bits_per_word_mask = pdata->bits_per_word_mask;
+ } else {
+ master->num_chipselect = 16;
+ master->mode_bits = SPI_CS_HIGH;
+ master->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 16);
+ }
+
+ master->dev.of_node = pdev->dev.of_node;
+
+ hw = spi_master_get_devdata(master);
+ hw->dev = &pdev->dev;
+
+ if (platid)
+ type = platid->driver_data;
+
+ /* find and map our resources */
+ if (type == ALTERA_SPI_TYPE_SUBDEV) {
+ struct resource *regoff;
+
+ hw->regmap = dev_get_regmap(pdev->dev.parent, NULL);
+ if (!hw->regmap) {
+ dev_err(&pdev->dev, "get regmap failed\n");
+ goto exit;
+ }
+
+ regoff = platform_get_resource(pdev, IORESOURCE_REG, 0);
+ if (regoff)
+ hw->regoff = regoff->start;
+ } else {
+ void __iomem *res;
+
+ res = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(res)) {
+ err = PTR_ERR(res);
+ goto exit;
+ }
+
+ hw->regmap = devm_regmap_init_mmio(&pdev->dev, res,
+ &spi_altera_config);
+ if (IS_ERR(hw->regmap)) {
+ dev_err(&pdev->dev, "regmap mmio init failed\n");
+ err = PTR_ERR(hw->regmap);
+ goto exit;
+ }
+ }
+
+ altera_spi_init_master(master);
+
+ /* irq is optional */
+ hw->irq = platform_get_irq(pdev, 0);
+ if (hw->irq >= 0) {
+ err = devm_request_irq(&pdev->dev, hw->irq, altera_spi_irq, 0,
+ pdev->name, master);
+ if (err)
+ goto exit;
+ }
+
+ err = devm_spi_register_master(&pdev->dev, master);
+ if (err)
+ goto exit;
+
+ if (pdata) {
+ for (i = 0; i < pdata->num_devices; i++) {
+ if (!spi_new_device(master, pdata->devices + i))
+ dev_warn(&pdev->dev,
+ "unable to create SPI device: %s\n",
+ pdata->devices[i].modalias);
+ }
+ }
+
+ dev_info(&pdev->dev, "regoff %u, irq %d\n", hw->regoff, hw->irq);
+
+ return 0;
+exit:
+ spi_master_put(master);
+ return err;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id altera_spi_match[] = {
+ { .compatible = "ALTR,spi-1.0", },
+ { .compatible = "altr,spi-1.0", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, altera_spi_match);
+#endif /* CONFIG_OF */
+
+static const struct platform_device_id altera_spi_ids[] = {
+ { DRV_NAME, ALTERA_SPI_TYPE_UNKNOWN },
+ { "subdev_spi_altera", ALTERA_SPI_TYPE_SUBDEV },
+ { }
+};
+MODULE_DEVICE_TABLE(platform, altera_spi_ids);
+
+static struct platform_driver altera_spi_driver = {
+ .probe = altera_spi_probe,
+ .driver = {
+ .name = DRV_NAME,
+ .pm = NULL,
+ .of_match_table = of_match_ptr(altera_spi_match),
+ },
+ .id_table = altera_spi_ids,
+};
+module_platform_driver(altera_spi_driver);
+
+MODULE_DESCRIPTION("Altera SPI driver");
+MODULE_AUTHOR("Thomas Chou <thomas@wytron.com.tw>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DRV_NAME);
#ifndef __LINUX_SPI_ALTERA_H
#define __LINUX_SPI_ALTERA_H
+#include <linux/interrupt.h>
#include <linux/regmap.h>
#include <linux/spi/spi.h>
#include <linux/types.h>
+#define ALTERA_SPI_MAX_CS 32
+
/**
* struct altera_spi_platform_data - Platform data of the Altera SPI driver
* @mode_bits: Mode bits of SPI master.
struct spi_board_info *devices;
};
+struct altera_spi {
+ int irq;
+ int len;
+ int count;
+ int bytes_per_word;
+ u32 imr;
+
+ /* data buffers */
+ const unsigned char *tx;
+ unsigned char *rx;
+
+ struct regmap *regmap;
+ u32 regoff;
+ struct device *dev;
+};
+
+extern irqreturn_t altera_spi_irq(int irq, void *dev);
+extern void altera_spi_init_master(struct spi_master *master);
#endif /* __LINUX_SPI_ALTERA_H */
projects / thirdparty / kernel / linux.git / commitdiff
