The CPLD is connected to the NAND flash chip and five LEDs. Access to those devices goes via this driver.
Signed-off-by: Bert Vermeulen <[email protected]> --- arch/mips/include/asm/mach-ath79/rb4xx_cpld.h | 41 ++++ drivers/spi/Kconfig | 8 + drivers/spi/Makefile | 1 + drivers/spi/spi-rb4xx-cpld.c | 326 ++++++++++++++++++++++++++ 4 files changed, 376 insertions(+) create mode 100644 arch/mips/include/asm/mach-ath79/rb4xx_cpld.h create mode 100644 drivers/spi/spi-rb4xx-cpld.c diff --git a/arch/mips/include/asm/mach-ath79/rb4xx_cpld.h b/arch/mips/include/asm/mach-ath79/rb4xx_cpld.h new file mode 100644 index 0000000..1df5a7e --- /dev/null +++ b/arch/mips/include/asm/mach-ath79/rb4xx_cpld.h @@ -0,0 +1,41 @@ +/* + * SPI driver definitions for the CPLD chip on the Mikrotik RB4xx boards + * + * Copyright (C) 2010 Gabor Juhos <[email protected]> + * + * 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. + */ + +#define CPLD_GPIO_nLED1 0 +#define CPLD_GPIO_nLED2 1 +#define CPLD_GPIO_nLED3 2 +#define CPLD_GPIO_nLED4 3 +#define CPLD_GPIO_FAN 4 +#define CPLD_GPIO_ALE 5 +#define CPLD_GPIO_CLE 6 +#define CPLD_GPIO_nCE 7 +#define CPLD_GPIO_nLED5 8 + +#define CPLD_NUM_GPIOS 9 + +#define CPLD_CFG_nLED1 BIT(CPLD_GPIO_nLED1) +#define CPLD_CFG_nLED2 BIT(CPLD_GPIO_nLED2) +#define CPLD_CFG_nLED3 BIT(CPLD_GPIO_nLED3) +#define CPLD_CFG_nLED4 BIT(CPLD_GPIO_nLED4) +#define CPLD_CFG_FAN BIT(CPLD_GPIO_FAN) +#define CPLD_CFG_ALE BIT(CPLD_GPIO_ALE) +#define CPLD_CFG_CLE BIT(CPLD_GPIO_CLE) +#define CPLD_CFG_nCE BIT(CPLD_GPIO_nCE) +#define CPLD_CFG_nLED5 BIT(CPLD_GPIO_nLED5) + +struct rb4xx_cpld_platform_data { + unsigned gpio_base; +}; + +extern int rb4xx_cpld_read(unsigned char *rx_buf, unsigned cnt); +extern int rb4xx_cpld_write(const unsigned char *buf, unsigned count); diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index aa76ce5..b32fa6a 100644 --- a/drivers/spi/Kconfig +++ b/drivers/spi/Kconfig @@ -435,6 +435,14 @@ config SPI_RB4XX help SPI controller driver for the Mikrotik RB4xx series boards. +config SPI_RB4XX_CPLD + tristate "MikroTik RB4XX CPLD driver" + depends on ATH79_MACH_RB4XX + help + SPI driver for the Xilinx CPLD chip present on the MikroTik + RB4xx boards. It controls CPU access to the NAND flash and + user LEDs. + config SPI_RSPI tristate "Renesas RSPI/QSPI controller" depends on SUPERH || ARCH_SHMOBILE || COMPILE_TEST diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile index 0218f39..c9bbdf9 100644 --- a/drivers/spi/Makefile +++ b/drivers/spi/Makefile @@ -67,6 +67,7 @@ obj-$(CONFIG_SPI_PXA2XX_PCI) += spi-pxa2xx-pci.o obj-$(CONFIG_SPI_QUP) += spi-qup.o obj-$(CONFIG_SPI_ROCKCHIP) += spi-rockchip.o obj-$(CONFIG_SPI_RB4XX) += spi-rb4xx.o +obj-$(CONFIG_SPI_RB4XX_CPLD) += spi-rb4xx-cpld.o obj-$(CONFIG_SPI_RSPI) += spi-rspi.o obj-$(CONFIG_SPI_S3C24XX) += spi-s3c24xx-hw.o spi-s3c24xx-hw-y := spi-s3c24xx.o diff --git a/drivers/spi/spi-rb4xx-cpld.c b/drivers/spi/spi-rb4xx-cpld.c new file mode 100644 index 0000000..4e777e2 --- /dev/null +++ b/drivers/spi/spi-rb4xx-cpld.c @@ -0,0 +1,326 @@ +/* + * SPI driver for the CPLD chip on the Mikrotik RB4xx boards + * + * Copyright (C) 2010 Gabor Juhos <[email protected]> + * + * 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 <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 idle */ +#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_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, + }, { + .tx_buf = NULL, + .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, + .fast_write = 1, + }, { + .len = 1, + .fast_write = 1, + }, + }; + 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_nLED5; + 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; + cpld->chip.dev = &cpld->spi->dev; + 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) + return -ENOMEM; + + mutex_init(&cpld->lock); + cpld->spi = spi_dev_get(spi); + dev_set_drvdata(&spi->dev, cpld); + + spi->mode = SPI_MODE_0; + 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 <[email protected]>"); +MODULE_LICENSE("GPL v2"); -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
