misc/eeprom: add eeprom access driver for digsy_mtc board
Anatolij Gustschin [Tue, 26 Jul 2011 00:13:29 +0000 (17:13 -0700)]
Both displays on digsy_mtc board obtain their configuration from microwire
EEPROMs which are connected to the SoC over GPIO lines.  We need an easy
way to access the EEPROMs to write the needed display configuration or to
read out the currently programmed configuration.  The generic
eeprom_93xx46 SPI driver added by previous patch allows EEPROM access over
sysfs.  Using the simple driver added by this patch we provide used GPIO
interface and access control description on the board for generic
eeprom_93xx46 driver and spi_gpio driver.

Signed-off-by: Anatolij Gustschin <agust@denx.de>
Cc: Jonathan Cameron <jic23@cam.ac.uk>
Cc: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/misc/eeprom/Kconfig
drivers/misc/eeprom/Makefile
drivers/misc/eeprom/digsy_mtc_eeprom.c [new file with mode: 0644]

index 620de28..26cf12c 100644 (file)
@@ -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
index ec55aad..fc1e81d 100644 (file)
@@ -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 (file)
index 0000000..66d9e1b
--- /dev/null
@@ -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);