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85 lines
2.0 KiB
85 lines
2.0 KiB
/* |
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* EEPROMs access control driver for display configuration EEPROMs |
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* on DigsyMTC board. |
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* |
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* (C) 2011 DENX Software Engineering, Anatolij Gustschin <agust@denx.de> |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License version 2 as |
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* published by the Free Software Foundation. |
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*/ |
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#include <linux/gpio.h> |
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#include <linux/init.h> |
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#include <linux/platform_device.h> |
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#include <linux/spi/spi.h> |
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#include <linux/spi/spi_gpio.h> |
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#include <linux/eeprom_93xx46.h> |
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#define GPIO_EEPROM_CLK 216 |
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#define GPIO_EEPROM_CS 210 |
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#define GPIO_EEPROM_DI 217 |
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#define GPIO_EEPROM_DO 249 |
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#define GPIO_EEPROM_OE 255 |
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#define EE_SPI_BUS_NUM 1 |
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static void digsy_mtc_op_prepare(void *p) |
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{ |
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/* enable */ |
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gpio_set_value(GPIO_EEPROM_OE, 0); |
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} |
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static void digsy_mtc_op_finish(void *p) |
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{ |
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/* disable */ |
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gpio_set_value(GPIO_EEPROM_OE, 1); |
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} |
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struct eeprom_93xx46_platform_data digsy_mtc_eeprom_data = { |
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.flags = EE_ADDR8, |
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.prepare = digsy_mtc_op_prepare, |
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.finish = digsy_mtc_op_finish, |
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}; |
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static struct spi_gpio_platform_data eeprom_spi_gpio_data = { |
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.sck = GPIO_EEPROM_CLK, |
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.mosi = GPIO_EEPROM_DI, |
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.miso = GPIO_EEPROM_DO, |
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.num_chipselect = 1, |
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}; |
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static struct platform_device digsy_mtc_eeprom = { |
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.name = "spi_gpio", |
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.id = EE_SPI_BUS_NUM, |
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.dev = { |
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.platform_data = &eeprom_spi_gpio_data, |
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}, |
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}; |
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static struct spi_board_info digsy_mtc_eeprom_info[] __initdata = { |
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{ |
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.modalias = "93xx46", |
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.max_speed_hz = 1000000, |
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.bus_num = EE_SPI_BUS_NUM, |
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.chip_select = 0, |
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.mode = SPI_MODE_0, |
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.controller_data = (void *)GPIO_EEPROM_CS, |
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.platform_data = &digsy_mtc_eeprom_data, |
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}, |
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}; |
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static int __init digsy_mtc_eeprom_devices_init(void) |
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{ |
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int ret; |
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ret = gpio_request_one(GPIO_EEPROM_OE, GPIOF_OUT_INIT_HIGH, |
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"93xx46 EEPROMs OE"); |
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if (ret) { |
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pr_err("can't request gpio %d\n", GPIO_EEPROM_OE); |
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return ret; |
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} |
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spi_register_board_info(digsy_mtc_eeprom_info, |
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ARRAY_SIZE(digsy_mtc_eeprom_info)); |
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return platform_device_register(&digsy_mtc_eeprom); |
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} |
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device_initcall(digsy_mtc_eeprom_devices_init);
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