diff options
Diffstat (limited to 'target/linux/ar71xx/files/drivers/spi/spi-rb4xx-cpld.c')
-rw-r--r-- | target/linux/ar71xx/files/drivers/spi/spi-rb4xx-cpld.c | 347 |
1 files changed, 0 insertions, 347 deletions
diff --git a/target/linux/ar71xx/files/drivers/spi/spi-rb4xx-cpld.c b/target/linux/ar71xx/files/drivers/spi/spi-rb4xx-cpld.c deleted file mode 100644 index 18af83b67c..0000000000 --- a/target/linux/ar71xx/files/drivers/spi/spi-rb4xx-cpld.c +++ /dev/null @@ -1,347 +0,0 @@ -/* - * SPI driver for the CPLD chip on the Mikrotik RB4xx boards - * - * Copyright (C) 2010 Gabor Juhos <juhosg@openwrt.org> - * - * This file was based on the patches for Linux 2.6.27.39 published by - * MikroTik for their RouterBoard 4xx series devices. - * - * This program is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License version 2 as published - * by the Free Software Foundation. - */ - -#include <linux/types.h> -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/init.h> -#include <linux/module.h> -#include <linux/device.h> -#include <linux/bitops.h> -#include <linux/spi/spi.h> -#include <linux/gpio.h> -#include <linux/slab.h> -#include <linux/version.h> - -#include <asm/mach-ath79/rb4xx_cpld.h> - -#define DRV_NAME "spi-rb4xx-cpld" -#define DRV_DESC "RB4xx CPLD driver" -#define DRV_VERSION "0.1.0" - -#define CPLD_CMD_WRITE_NAND 0x08 /* send cmd, n x send data, send indle */ -#define CPLD_CMD_WRITE_CFG 0x09 /* send cmd, n x send cfg */ -#define CPLD_CMD_READ_NAND 0x0a /* send cmd, send idle, n x read data */ -#define CPLD_CMD_READ_FAST 0x0b /* send cmd, 4 x idle, n x read data */ -#define CPLD_CMD_LED5_ON 0x0c /* send cmd */ -#define CPLD_CMD_LED5_OFF 0x0d /* send cmd */ - -struct rb4xx_cpld { - struct spi_device *spi; - struct mutex lock; - struct gpio_chip chip; - unsigned int config; -}; - -static struct rb4xx_cpld *rb4xx_cpld; - -static inline struct rb4xx_cpld *gpio_to_cpld(struct gpio_chip *chip) -{ - return container_of(chip, struct rb4xx_cpld, chip); -} - -static int rb4xx_cpld_write_cmd(struct rb4xx_cpld *cpld, unsigned char cmd) -{ - struct spi_transfer t[1]; - struct spi_message m; - unsigned char tx_buf[1]; - int err; - - spi_message_init(&m); - memset(&t, 0, sizeof(t)); - - t[0].tx_buf = tx_buf; - t[0].len = sizeof(tx_buf); - spi_message_add_tail(&t[0], &m); - - tx_buf[0] = cmd; - - err = spi_sync(cpld->spi, &m); - return err; -} - -static int rb4xx_cpld_write_cfg(struct rb4xx_cpld *cpld, unsigned char config) -{ - struct spi_transfer t[1]; - struct spi_message m; - unsigned char cmd[2]; - int err; - - spi_message_init(&m); - memset(&t, 0, sizeof(t)); - - t[0].tx_buf = cmd; - t[0].len = sizeof(cmd); - spi_message_add_tail(&t[0], &m); - - cmd[0] = CPLD_CMD_WRITE_CFG; - cmd[1] = config; - - err = spi_sync(cpld->spi, &m); - return err; -} - -static int __rb4xx_cpld_change_cfg(struct rb4xx_cpld *cpld, unsigned mask, - unsigned value) -{ - unsigned int config; - int err; - - config = cpld->config & ~mask; - config |= value; - - if ((cpld->config ^ config) & 0xff) { - err = rb4xx_cpld_write_cfg(cpld, config); - if (err) - return err; - } - - if ((cpld->config ^ config) & CPLD_CFG_nLED5) { - err = rb4xx_cpld_write_cmd(cpld, (value) ? CPLD_CMD_LED5_ON : - CPLD_CMD_LED5_OFF); - if (err) - return err; - } - - cpld->config = config; - return 0; -} - -int rb4xx_cpld_change_cfg(unsigned mask, unsigned value) -{ - int ret; - - if (rb4xx_cpld == NULL) - return -ENODEV; - - mutex_lock(&rb4xx_cpld->lock); - ret = __rb4xx_cpld_change_cfg(rb4xx_cpld, mask, value); - mutex_unlock(&rb4xx_cpld->lock); - - return ret; -} -EXPORT_SYMBOL_GPL(rb4xx_cpld_change_cfg); - -int rb4xx_cpld_read(unsigned char *rx_buf, unsigned count) -{ - static const unsigned char cmd[2] = { CPLD_CMD_READ_NAND, 0 }; - struct spi_transfer t[2] = { - { - .tx_buf = &cmd, - .len = 2, - }, { - .rx_buf = rx_buf, - .len = count, - }, - }; - struct spi_message m; - - if (rb4xx_cpld == NULL) - return -ENODEV; - - spi_message_init(&m); - spi_message_add_tail(&t[0], &m); - spi_message_add_tail(&t[1], &m); - return spi_sync(rb4xx_cpld->spi, &m); -} -EXPORT_SYMBOL_GPL(rb4xx_cpld_read); - -int rb4xx_cpld_write(const unsigned char *buf, unsigned count) -{ - static const unsigned char cmd = CPLD_CMD_WRITE_NAND; - struct spi_transfer t[3] = { - { - .tx_buf = &cmd, - .len = 1, - }, { - .tx_buf = buf, - .len = count, - .tx_nbits = SPI_NBITS_DUAL, - }, { - .len = 1, - .tx_nbits = SPI_NBITS_DUAL, - }, - }; - struct spi_message m; - - if (rb4xx_cpld == NULL) - return -ENODEV; - - spi_message_init(&m); - spi_message_add_tail(&t[0], &m); - spi_message_add_tail(&t[1], &m); - spi_message_add_tail(&t[2], &m); - return spi_sync(rb4xx_cpld->spi, &m); -} -EXPORT_SYMBOL_GPL(rb4xx_cpld_write); - -static int rb4xx_cpld_gpio_get(struct gpio_chip *chip, unsigned offset) -{ - struct rb4xx_cpld *cpld = gpio_to_cpld(chip); - int ret; - - mutex_lock(&cpld->lock); - ret = (cpld->config >> offset) & 1; - mutex_unlock(&cpld->lock); - - return ret; -} - -static void rb4xx_cpld_gpio_set(struct gpio_chip *chip, unsigned offset, - int value) -{ - struct rb4xx_cpld *cpld = gpio_to_cpld(chip); - - mutex_lock(&cpld->lock); - __rb4xx_cpld_change_cfg(cpld, (1 << offset), !!value << offset); - mutex_unlock(&cpld->lock); -} - -static int rb4xx_cpld_gpio_direction_input(struct gpio_chip *chip, - unsigned offset) -{ - return -EOPNOTSUPP; -} - -static int rb4xx_cpld_gpio_direction_output(struct gpio_chip *chip, - unsigned offset, - int value) -{ - struct rb4xx_cpld *cpld = gpio_to_cpld(chip); - int ret; - - mutex_lock(&cpld->lock); - ret = __rb4xx_cpld_change_cfg(cpld, (1 << offset), !!value << offset); - mutex_unlock(&cpld->lock); - - return ret; -} - -static int rb4xx_cpld_gpio_init(struct rb4xx_cpld *cpld, unsigned int base) -{ - int err; - - /* init config */ - cpld->config = CPLD_CFG_nLED1 | CPLD_CFG_nLED2 | CPLD_CFG_nLED3 | - CPLD_CFG_nLED4 | CPLD_CFG_nCE; - rb4xx_cpld_write_cfg(cpld, cpld->config); - - /* setup GPIO chip */ - cpld->chip.label = DRV_NAME; - - cpld->chip.get = rb4xx_cpld_gpio_get; - cpld->chip.set = rb4xx_cpld_gpio_set; - cpld->chip.direction_input = rb4xx_cpld_gpio_direction_input; - cpld->chip.direction_output = rb4xx_cpld_gpio_direction_output; - - cpld->chip.base = base; - cpld->chip.ngpio = CPLD_NUM_GPIOS; - cpld->chip.can_sleep = 1; -#if LINUX_VERSION_CODE < KERNEL_VERSION(4,5,0) - cpld->chip.dev = &cpld->spi->dev; -#else - cpld->chip.parent = &cpld->spi->dev; -#endif - cpld->chip.owner = THIS_MODULE; - - err = gpiochip_add(&cpld->chip); - if (err) - dev_err(&cpld->spi->dev, "adding GPIO chip failed, err=%d\n", - err); - - return err; -} - -static int rb4xx_cpld_probe(struct spi_device *spi) -{ - struct rb4xx_cpld *cpld; - struct rb4xx_cpld_platform_data *pdata; - int err; - - pdata = spi->dev.platform_data; - if (!pdata) { - dev_dbg(&spi->dev, "no platform data\n"); - return -EINVAL; - } - - cpld = kzalloc(sizeof(*cpld), GFP_KERNEL); - if (!cpld) { - dev_err(&spi->dev, "no memory for private data\n"); - return -ENOMEM; - } - - mutex_init(&cpld->lock); - cpld->spi = spi_dev_get(spi); - dev_set_drvdata(&spi->dev, cpld); - - spi->mode = SPI_MODE_0 | SPI_TX_DUAL; - spi->bits_per_word = 8; - err = spi_setup(spi); - if (err) { - dev_err(&spi->dev, "spi_setup failed, err=%d\n", err); - goto err_drvdata; - } - - err = rb4xx_cpld_gpio_init(cpld, pdata->gpio_base); - if (err) - goto err_drvdata; - - rb4xx_cpld = cpld; - - return 0; - -err_drvdata: - dev_set_drvdata(&spi->dev, NULL); - kfree(cpld); - - return err; -} - -static int rb4xx_cpld_remove(struct spi_device *spi) -{ - struct rb4xx_cpld *cpld; - - rb4xx_cpld = NULL; - cpld = dev_get_drvdata(&spi->dev); - dev_set_drvdata(&spi->dev, NULL); - kfree(cpld); - - return 0; -} - -static struct spi_driver rb4xx_cpld_driver = { - .driver = { - .name = DRV_NAME, - .bus = &spi_bus_type, - .owner = THIS_MODULE, - }, - .probe = rb4xx_cpld_probe, - .remove = rb4xx_cpld_remove, -}; - -static int __init rb4xx_cpld_init(void) -{ - return spi_register_driver(&rb4xx_cpld_driver); -} -module_init(rb4xx_cpld_init); - -static void __exit rb4xx_cpld_exit(void) -{ - spi_unregister_driver(&rb4xx_cpld_driver); -} -module_exit(rb4xx_cpld_exit); - -MODULE_DESCRIPTION(DRV_DESC); -MODULE_VERSION(DRV_VERSION); -MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>"); -MODULE_LICENSE("GPL v2"); |