diff options
| -rw-r--r-- | drivers/misc/eeprom/Kconfig | 12 | ||||
| -rw-r--r-- | drivers/misc/eeprom/Makefile | 1 | ||||
| -rw-r--r-- | drivers/misc/eeprom/digsy_mtc_eeprom.c | 85 |
3 files changed, 98 insertions, 0 deletions
diff --git a/drivers/misc/eeprom/Kconfig b/drivers/misc/eeprom/Kconfig index 620de283b40..26cf12ca7f5 100644 --- a/drivers/misc/eeprom/Kconfig +++ b/drivers/misc/eeprom/Kconfig @@ -83,4 +83,16 @@ config EEPROM_93XX46 If unsure, say N. +config EEPROM_DIGSY_MTC_CFG + bool "DigsyMTC display configuration EEPROMs device" + depends on PPC_MPC5200_GPIO && GPIOLIB && SPI_GPIO + help + This option enables access to display configuration EEPROMs + on digsy_mtc board. You have to additionally select Microwire + EEPROM 93XX46 driver. sysfs entries will be created for that + EEPROM allowing to read/write the configuration data or to + erase the whole EEPROM. + + If unsure, say N. + endmenu diff --git a/drivers/misc/eeprom/Makefile b/drivers/misc/eeprom/Makefile index ec55aad24cf..fc1e81d2926 100644 --- a/drivers/misc/eeprom/Makefile +++ b/drivers/misc/eeprom/Makefile @@ -4,3 +4,4 @@ obj-$(CONFIG_EEPROM_LEGACY) += eeprom.o obj-$(CONFIG_EEPROM_MAX6875) += max6875.o obj-$(CONFIG_EEPROM_93CX6) += eeprom_93cx6.o obj-$(CONFIG_EEPROM_93XX46) += eeprom_93xx46.o +obj-$(CONFIG_EEPROM_DIGSY_MTC_CFG) += digsy_mtc_eeprom.o diff --git a/drivers/misc/eeprom/digsy_mtc_eeprom.c b/drivers/misc/eeprom/digsy_mtc_eeprom.c new file mode 100644 index 00000000000..66d9e1baeae --- /dev/null +++ b/drivers/misc/eeprom/digsy_mtc_eeprom.c @@ -0,0 +1,85 @@ +/* + * EEPROMs access control driver for display configuration EEPROMs + * on DigsyMTC board. + * + * (C) 2011 DENX Software Engineering, Anatolij Gustschin <agust@denx.de> + * + * 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/gpio.h> +#include <linux/init.h> +#include <linux/platform_device.h> +#include <linux/spi/spi.h> +#include <linux/spi/spi_gpio.h> +#include <linux/eeprom_93xx46.h> + +#define GPIO_EEPROM_CLK 216 +#define GPIO_EEPROM_CS 210 +#define GPIO_EEPROM_DI 217 +#define GPIO_EEPROM_DO 249 +#define GPIO_EEPROM_OE 255 +#define EE_SPI_BUS_NUM 1 + +static void digsy_mtc_op_prepare(void *p) +{ + /* enable */ + gpio_set_value(GPIO_EEPROM_OE, 0); +} + +static void digsy_mtc_op_finish(void *p) +{ + /* disable */ + gpio_set_value(GPIO_EEPROM_OE, 1); +} + +struct eeprom_93xx46_platform_data digsy_mtc_eeprom_data = { + .flags = EE_ADDR8, + .prepare = digsy_mtc_op_prepare, + .finish = digsy_mtc_op_finish, +}; + +static struct spi_gpio_platform_data eeprom_spi_gpio_data = { + .sck = GPIO_EEPROM_CLK, + .mosi = GPIO_EEPROM_DI, + .miso = GPIO_EEPROM_DO, + .num_chipselect = 1, +}; + +static struct platform_device digsy_mtc_eeprom = { + .name = "spi_gpio", + .id = EE_SPI_BUS_NUM, + .dev = { + .platform_data = &eeprom_spi_gpio_data, + }, +}; + +static struct spi_board_info digsy_mtc_eeprom_info[] __initdata = { + { + .modalias = "93xx46", + .max_speed_hz = 1000000, + .bus_num = EE_SPI_BUS_NUM, + .chip_select = 0, + .mode = SPI_MODE_0, + .controller_data = (void *)GPIO_EEPROM_CS, + .platform_data = &digsy_mtc_eeprom_data, + }, +}; + +static int __init digsy_mtc_eeprom_devices_init(void) +{ + int ret; + + ret = gpio_request_one(GPIO_EEPROM_OE, GPIOF_OUT_INIT_HIGH, + "93xx46 EEPROMs OE"); + if (ret) { + pr_err("can't request gpio %d\n", GPIO_EEPROM_OE); + return ret; + } + spi_register_board_info(digsy_mtc_eeprom_info, + ARRAY_SIZE(digsy_mtc_eeprom_info)); + return platform_device_register(&digsy_mtc_eeprom); +} +device_initcall(digsy_mtc_eeprom_devices_init); |