# This is free software, licensed under the GNU General Public License v2.
# See /LICENSE for more information.
-#XXX This package will go away once the stuff is merged into the kernel.
-
include $(TOPDIR)/rules.mk
include $(INCLUDE_DIR)/kernel.mk
define KernelPackage/mmc-over-gpio
SUBMENU:=Other modules
DEPENDS:=@GPIO_SUPPORT +kmod-mmc-spi +kmod-spi-gpio
+ KCONFIG:=CONFIG_GPIOMMC
TITLE:=MMC/SD card over GPIO support
- FILES:=$(PKG_BUILD_DIR)/mmc_over_spigpio.$(LINUX_KMOD_SUFFIX)
- AUTOLOAD:=$(call AutoLoad,93,spi_gpio mmc_over_spigpio)
+ FILES:=$(LINUX_DIR)/drivers/mmc/host/gpiommc.$(LINUX_KMOD_SUFFIX)
+ AUTOLOAD:=$(call AutoLoad,93,spi_gpio gpiommc)
endef
define KernelPackage/mmc-over-gpio/description
define Build/Prepare
mkdir -p $(PKG_BUILD_DIR)
- $(CP) ./src/* $(PKG_BUILD_DIR)/
endef
define Build/Compile
- $(MAKE) -C "$(LINUX_DIR)" \
- CROSS_COMPILE="$(TARGET_CROSS)" \
- ARCH="$(LINUX_KARCH)" \
- SUBDIRS="$(PKG_BUILD_DIR)" \
- EXTRA_CFLAGS="$(BUILDFLAGS)" \
- modules
endef
define KernelPackage/mmc-over-gpio/install
START=90
SYSFS="/sys"
-SYSFS_DRIVERDIR="$SYSFS/bus/platform/drivers/spi-gpio-mmc"
+SYSFS_DRIVERDIR="$SYSFS/bus/platform/drivers/gpiommc"
# add_device(name, DI_pin, DO_pin, CLK_pin, CS_pin, mode)
add_device() {
- echo -n "$1" "$2","$3","$4","$5" "$6" > $SYSFS_DRIVERDIR/add
+ echo -n "$1" "$2" "$3" "$4" "$5" "$6" > $SYSFS_DRIVERDIR/add
}
# remove_device(name)
+++ /dev/null
-obj-m += mmc_over_spigpio.o
+++ /dev/null
-/*
- * Driver for driving an MMC card over a bitbanging GPIO SPI bus.
- *
- * Copyright 2008 Michael Buesch <mb@bu3sch.de>
- *
- * Licensed under the GNU/GPL. See COPYING for details.
- */
-
-#include <linux/platform_device.h>
-#include <linux/list.h>
-#include <linux/mutex.h>
-#include <linux/spi/spi_gpio.h>
-
-
-/* This is the maximum speed in Hz */
-#define GPIOMMC_MAXSPEED 5000000 /* Hz */
-
-
-#define DRIVER_NAME "spi-gpio-mmc"
-#define PFX DRIVER_NAME ": "
-
-
-#define GPIOMMC_MAX_NAMELEN 15
-#define GPIOMMC_MAX_NAMELEN_STR __stringify(GPIOMMC_MAX_NAMELEN)
-
-struct gpiommc_pins {
- unsigned int gpio_di; /* Card DI pin */
- unsigned int gpio_do; /* Card DO pin */
- unsigned int gpio_clk; /* Card CLK pin */
- unsigned int gpio_cs; /* Card CS pin */
-};
-
-struct gpiommc_device {
- char name[GPIOMMC_MAX_NAMELEN + 1];
- struct platform_device *pdev;
- struct platform_device *spi_pdev;
- struct gpiommc_pins pins;
- u8 mode; /* SPI_MODE_X */
- struct spi_board_info boardinfo;
-
- struct list_head list;
-};
-
-
-static LIST_HEAD(gpiommc_devices_list);
-static DEFINE_MUTEX(gpiommc_mutex);
-
-
-MODULE_DESCRIPTION("SPI-GPIO based MMC driver");
-MODULE_AUTHOR("Michael Buesch");
-MODULE_LICENSE("GPL");
-
-
-static int gpiommc_boardinfo_setup(struct spi_board_info *bi,
- struct spi_master *master,
- void *data)
-{
- struct gpiommc_device *d = data;
-
- /* Bind the SPI master to the MMC-SPI host driver. */
- strlcpy(bi->modalias, "mmc_spi", sizeof(bi->modalias));
-
- bi->max_speed_hz = GPIOMMC_MAXSPEED;
- bi->bus_num = master->bus_num;
- bi->mode = d->mode;
-
- return 0;
-}
-
-static int gpiommc_probe(struct platform_device *pdev)
-{
- static int instance;
- struct gpiommc_device *d = platform_get_drvdata(pdev);
- struct spi_gpio_platform_data pdata;
- int err = -ENOMEM;
-
- d->spi_pdev = platform_device_alloc("spi-gpio", instance++);
- if (!d->spi_pdev)
- goto out;
-
- memset(&pdata, 0, sizeof(pdata));
- pdata.pin_clk = d->pins.gpio_clk;
- pdata.pin_miso = d->pins.gpio_do;
- pdata.pin_mosi = d->pins.gpio_di;
- pdata.pin_cs = d->pins.gpio_cs;
- pdata.cs_activelow = 1;
- pdata.no_spi_delay = 1;
- pdata.boardinfo_setup = gpiommc_boardinfo_setup;
- pdata.boardinfo_setup_data = d;
-
- err = platform_device_add_data(d->spi_pdev, &pdata, sizeof(pdata));
- if (err)
- goto err_free_pdev;
- err = platform_device_register(d->spi_pdev);
- if (err)
- goto err_free_pdata;
-
- printk(KERN_INFO PFX "MMC-Card \"%s\" "
- "attached to GPIO pins %u,%u,%u,%u\n",
- d->name, d->pins.gpio_di, d->pins.gpio_do,
- d->pins.gpio_clk, d->pins.gpio_cs);
-out:
- return err;
-
-err_free_pdata:
- kfree(d->spi_pdev->dev.platform_data);
- d->spi_pdev->dev.platform_data = NULL;
-err_free_pdev:
- platform_device_put(d->spi_pdev);
- return err;
-}
-
-static int gpiommc_remove(struct platform_device *pdev)
-{
- struct gpiommc_device *d = platform_get_drvdata(pdev);
-
- platform_device_unregister(d->spi_pdev);
- printk(KERN_INFO PFX "MMC-Card \"%s\" removed\n", d->name);
-
- return 0;
-}
-
-static void gpiommc_free(struct gpiommc_device *d)
-{
- kfree(d);
-}
-
-static struct gpiommc_device * gpiommc_alloc(struct platform_device *pdev,
- const char *name,
- const struct gpiommc_pins *pins,
- u8 mode)
-{
- struct gpiommc_device *d;
-
- d = kmalloc(sizeof(*d), GFP_KERNEL);
- if (!d)
- return NULL;
-
- strcpy(d->name, name);
- memcpy(&d->pins, pins, sizeof(d->pins));
- d->mode = mode;
- INIT_LIST_HEAD(&d->list);
-
- return d;
-}
-
-/* List must be locked. */
-static struct gpiommc_device * gpiommc_find_device(const char *name)
-{
- struct gpiommc_device *d;
-
- list_for_each_entry(d, &gpiommc_devices_list, list) {
- if (strcmp(d->name, name) == 0)
- return d;
- }
-
- return NULL;
-}
-
-static void gpiommc_do_destroy_device(struct gpiommc_device *d)
-{
- list_del(&d->list);
- platform_device_unregister(d->pdev);
- gpiommc_free(d);
-}
-
-static int gpiommc_destroy_device(const char *name)
-{
- struct gpiommc_device *d;
- int err = -ENODEV;
-
- mutex_lock(&gpiommc_mutex);
- d = gpiommc_find_device(name);
- if (!d)
- goto out_unlock;
- gpiommc_do_destroy_device(d);
- err = 0;
-out_unlock:
- mutex_unlock(&gpiommc_mutex);
-
- return err;
-}
-
-static int gpiommc_create_device(const char *name,
- const struct gpiommc_pins *pins,
- u8 mode)
-{
- static int instance;
- struct platform_device *pdev;
- struct gpiommc_device *d;
- int err;
-
- mutex_lock(&gpiommc_mutex);
- err = -EEXIST;
- if (gpiommc_find_device(name))
- goto out_unlock;
- err = -ENOMEM;
- pdev = platform_device_alloc(DRIVER_NAME, instance++);
- if (!pdev)
- goto out_unlock;
- d = gpiommc_alloc(pdev, name, pins, mode);
- if (!d)
- goto err_free_pdev;
- platform_set_drvdata(pdev, d);
- d->pdev = pdev;
- err = platform_device_register(pdev);
- if (err)
- goto err_free_mdev;
- list_add(&d->list, &gpiommc_devices_list);
-
- err = 0;
-out_unlock:
- mutex_unlock(&gpiommc_mutex);
-
- return err;
-
-err_free_mdev:
- gpiommc_free(d);
-err_free_pdev:
- platform_device_put(pdev);
- goto out_unlock;
-}
-
-static ssize_t gpiommc_add_show(struct device_driver *drv,
- char *buf)
-{
- return snprintf(buf, PAGE_SIZE, "NAME DI_pin,DO_pin,CLK_pin,CS_pin [MODE]\n");
-}
-
-static ssize_t gpiommc_add_store(struct device_driver *drv,
- const char *buf, size_t count)
-{
- int res, err;
- char name[GPIOMMC_MAX_NAMELEN + 1];
- struct gpiommc_pins pins;
- unsigned int mode;
-
- res = sscanf(buf, "%" GPIOMMC_MAX_NAMELEN_STR "s %u,%u,%u,%u %u",
- name, &pins.gpio_di, &pins.gpio_do,
- &pins.gpio_clk, &pins.gpio_cs, &mode);
- if (res == 5)
- mode = 0;
- else if (res != 6)
- return -EINVAL;
- switch (mode) {
- case 0:
- mode = SPI_MODE_0;
- break;
- case 1:
- mode = SPI_MODE_1;
- break;
- case 2:
- mode = SPI_MODE_2;
- break;
- case 3:
- mode = SPI_MODE_3;
- break;
- default:
- return -EINVAL;
- }
- err = gpiommc_create_device(name, &pins, mode);
-
- return err ? err : count;
-}
-
-static ssize_t gpiommc_remove_show(struct device_driver *drv,
- char *buf)
-{
- return snprintf(buf, PAGE_SIZE, "write device-name to remove the device\n");
-}
-
-static ssize_t gpiommc_remove_store(struct device_driver *drv,
- const char *buf, size_t count)
-{
- int err;
-
- err = gpiommc_destroy_device(buf);
-
- return err ? err : count;
-}
-
-static DRIVER_ATTR(add, 0600,
- gpiommc_add_show, gpiommc_add_store);
-static DRIVER_ATTR(remove, 0600,
- gpiommc_remove_show, gpiommc_remove_store);
-
-static struct platform_driver gpiommc_plat_driver = {
- .probe = gpiommc_probe,
- .remove = gpiommc_remove,
- .driver = {
- .name = DRIVER_NAME,
- .owner = THIS_MODULE,
- },
-};
-
-static int __init gpiommc_modinit(void)
-{
- int err;
-
- err = platform_driver_register(&gpiommc_plat_driver);
- if (err)
- return err;
- err = driver_create_file(&gpiommc_plat_driver.driver,
- &driver_attr_add);
- if (err)
- goto err_drv_unreg;
- err = driver_create_file(&gpiommc_plat_driver.driver,
- &driver_attr_remove);
- if (err)
- goto err_remove_add;
-
- return 0;
-
-err_remove_add:
- driver_remove_file(&gpiommc_plat_driver.driver,
- &driver_attr_add);
-err_drv_unreg:
- platform_driver_unregister(&gpiommc_plat_driver);
- return err;
-}
-module_init(gpiommc_modinit);
-
-static void __exit gpiommc_modexit(void)
-{
- struct gpiommc_device *d, *tmp;
-
- driver_remove_file(&gpiommc_plat_driver.driver,
- &driver_attr_remove);
- driver_remove_file(&gpiommc_plat_driver.driver,
- &driver_attr_add);
-
- mutex_lock(&gpiommc_mutex);
- list_for_each_entry_safe(d, tmp, &gpiommc_devices_list, list)
- gpiommc_do_destroy_device(d);
- mutex_unlock(&gpiommc_mutex);
-
- platform_driver_unregister(&gpiommc_plat_driver);
-}
-module_exit(gpiommc_modexit);
+++ /dev/null
-/*
- * Bitbanging SPI bus driver using GPIO API
- *
- * Copyright (c) 2008 Piotr Skamruk
- * Copyright (c) 2008 Michael Buesch
- *
- * based on spi_s3c2410_gpio.c
- * Copyright (c) 2006 Ben Dooks
- * Copyright (c) 2006 Simtec Electronics
- * and on i2c-gpio.c
- * Copyright (C) 2007 Atmel Corporation
- *
- * 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/kernel.h>
-#include <linux/init.h>
-#include <linux/delay.h>
-#include <linux/spinlock.h>
-#include <linux/workqueue.h>
-#include <linux/module.h>
-#include <linux/platform_device.h>
-#include <linux/spi/spi.h>
-#include <linux/spi/spi_bitbang.h>
-#include "linux/spi/spi_gpio.h" //XXX
-#include <asm/gpio.h>
-
-
-struct spi_gpio {
- struct spi_bitbang bitbang;
- struct spi_gpio_platform_data *info;
- struct platform_device *pdev;
- struct spi_board_info bi;
-};
-
-
-static inline struct spi_gpio *spidev_to_sg(struct spi_device *dev)
-{
- return dev->controller_data;
-}
-
-static inline void setsck(struct spi_device *dev, int val)
-{
- struct spi_gpio *sp = spidev_to_sg(dev);
- gpio_set_value(sp->info->pin_clk, val ? 1 : 0);
-}
-
-static inline void setmosi(struct spi_device *dev, int val )
-{
- struct spi_gpio *sp = spidev_to_sg(dev);
- gpio_set_value(sp->info->pin_mosi, val ? 1 : 0);
-}
-
-static inline u32 getmiso(struct spi_device *dev)
-{
- struct spi_gpio *sp = spidev_to_sg(dev);
- return gpio_get_value(sp->info->pin_miso) ? 1 : 0;
-}
-
-static inline void do_spidelay(struct spi_device *dev, unsigned nsecs)
-{
- struct spi_gpio *sp = spidev_to_sg(dev);
-
- if (!sp->info->no_spi_delay)
- ndelay(nsecs);
-}
-
-#define spidelay(nsecs) do { \
- /* Steal the spi_device pointer from our caller. \
- * The bitbang-API should probably get fixed here... */ \
- do_spidelay(spi, nsecs); \
- } while (0)
-
-#define EXPAND_BITBANG_TXRX
-#include <linux/spi/spi_bitbang.h>
-
-static u32 spi_gpio_txrx_mode0(struct spi_device *spi,
- unsigned nsecs, u32 word, u8 bits)
-{
- return bitbang_txrx_be_cpha0(spi, nsecs, 0, word, bits);
-}
-
-static u32 spi_gpio_txrx_mode1(struct spi_device *spi,
- unsigned nsecs, u32 word, u8 bits)
-{
- return bitbang_txrx_be_cpha1(spi, nsecs, 0, word, bits);
-}
-
-static u32 spi_gpio_txrx_mode2(struct spi_device *spi,
- unsigned nsecs, u32 word, u8 bits)
-{
- return bitbang_txrx_be_cpha0(spi, nsecs, 1, word, bits);
-}
-
-static u32 spi_gpio_txrx_mode3(struct spi_device *spi,
- unsigned nsecs, u32 word, u8 bits)
-{
- return bitbang_txrx_be_cpha1(spi, nsecs, 1, word, bits);
-}
-
-static void spi_gpio_chipselect(struct spi_device *dev, int on)
-{
- struct spi_gpio *sp = spidev_to_sg(dev);
-
- if (sp->info->cs_activelow)
- on = !on;
- gpio_set_value(sp->info->pin_cs, on ? 1 : 0);
-}
-
-static int spi_gpio_probe(struct platform_device *pdev)
-{
- struct spi_master *master;
- struct spi_gpio_platform_data *pdata;
- struct spi_gpio *sp;
- struct spi_device *spidev;
- int err;
-
- pdata = pdev->dev.platform_data;
- if (!pdata)
- return -ENXIO;
-
- err = -ENOMEM;
- master = spi_alloc_master(&pdev->dev, sizeof(struct spi_gpio));
- if (!master)
- goto err_alloc_master;
-
- sp = spi_master_get_devdata(master);
- platform_set_drvdata(pdev, sp);
- sp->info = pdata;
-
- err = gpio_request(pdata->pin_clk, "spi_clock");
- if (err)
- goto err_request_clk;
- err = gpio_request(pdata->pin_mosi, "spi_mosi");
- if (err)
- goto err_request_mosi;
- err = gpio_request(pdata->pin_miso, "spi_miso");
- if (err)
- goto err_request_miso;
- err = gpio_request(pdata->pin_cs, "spi_cs");
- if (err)
- goto err_request_cs;
-
- sp->bitbang.master = spi_master_get(master);
- sp->bitbang.master->bus_num = -1;
- sp->bitbang.master->num_chipselect = 1;
- sp->bitbang.chipselect = spi_gpio_chipselect;
- sp->bitbang.txrx_word[SPI_MODE_0] = spi_gpio_txrx_mode0;
- sp->bitbang.txrx_word[SPI_MODE_1] = spi_gpio_txrx_mode1;
- sp->bitbang.txrx_word[SPI_MODE_2] = spi_gpio_txrx_mode2;
- sp->bitbang.txrx_word[SPI_MODE_3] = spi_gpio_txrx_mode3;
-
- gpio_direction_output(pdata->pin_clk, 0);
- gpio_direction_output(pdata->pin_mosi, 0);
- gpio_direction_output(pdata->pin_cs,
- pdata->cs_activelow ? 1 : 0);
- gpio_direction_input(pdata->pin_miso);
-
- err = spi_bitbang_start(&sp->bitbang);
- if (err)
- goto err_no_bitbang;
- err = pdata->boardinfo_setup(&sp->bi, master,
- pdata->boardinfo_setup_data);
- if (err)
- goto err_bi_setup;
- sp->bi.controller_data = sp;
- spidev = spi_new_device(master, &sp->bi);
- if (!spidev)
- goto err_new_dev;
-
- return 0;
-
-err_new_dev:
-err_bi_setup:
- spi_bitbang_stop(&sp->bitbang);
-err_no_bitbang:
- spi_master_put(sp->bitbang.master);
- gpio_free(pdata->pin_cs);
-err_request_cs:
- gpio_free(pdata->pin_miso);
-err_request_miso:
- gpio_free(pdata->pin_mosi);
-err_request_mosi:
- gpio_free(pdata->pin_clk);
-err_request_clk:
- kfree(master);
-
-err_alloc_master:
- return err;
-}
-
-static int __devexit spi_gpio_remove(struct platform_device *pdev)
-{
- struct spi_gpio *sp;
- struct spi_gpio_platform_data *pdata;
-
- pdata = pdev->dev.platform_data;
- sp = platform_get_drvdata(pdev);
-
- gpio_free(pdata->pin_clk);
- gpio_free(pdata->pin_mosi);
- gpio_free(pdata->pin_miso);
- gpio_free(pdata->pin_cs);
- spi_bitbang_stop(&sp->bitbang);
- spi_master_put(sp->bitbang.master);
-
- return 0;
-}
-
-static struct platform_driver spi_gpio_driver = {
- .driver = {
- .name = "spi-gpio",
- .owner = THIS_MODULE,
- },
- .probe = spi_gpio_probe,
- .remove = __devexit_p(spi_gpio_remove),
-};
-
-static int __init spi_gpio_init(void)
-{
- int err;
-
- err = platform_driver_register(&spi_gpio_driver);
- if (err)
- printk(KERN_ERR "spi-gpio: register failed: %d\n", err);
-
- return err;
-}
-module_init(spi_gpio_init);
-
-static void __exit spi_gpio_exit(void)
-{
- platform_driver_unregister(&spi_gpio_driver);
-}
-module_exit(spi_gpio_exit);
-
-MODULE_AUTHOR("Piot Skamruk <piotr.skamruk at gmail.com>");
-MODULE_AUTHOR("Michael Buesch");
-MODULE_DESCRIPTION("Platform independent GPIO bitbangling SPI driver");
-MODULE_LICENSE("GPL v2");
+++ /dev/null
-/*
- * spi_gpio interface to platform code
- *
- * Copyright (c) 2008 Piotr Skamruk
- *
- * 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.
- */
-#ifndef _LINUX_SPI_SPI_GPIO
-#define _LINUX_SPI_SPI_GPIO
-
-#include <linux/types.h>
-#include <linux/spi/spi.h>
-
-
-/** struct spi_gpio_platform_data - Data definitions for a SPI-GPIO device.
- * This structure holds information about a GPIO-based SPI device.
- *
- * @pin_clk: The GPIO pin number of the CLOCK pin.
- *
- * @pin_miso: The GPIO pin number of the MISO pin.
- *
- * @pin_mosi: The GPIO pin number of the MOSI pin.
- *
- * @pin_cs: The GPIO pin number of the CHIPSELECT pin.
- *
- * @cs_activelow: If true, the chip is selected when the CS line is low.
- *
- * @no_spi_delay: If true, no delay is done in the lowlevel bitbanging.
- * Note that doing no delay is not standards compliant,
- * but it might be needed to speed up transfers on some
- * slow embedded machines.
- *
- * @boardinfo_setup: This callback is called after the
- * SPI master device was registered, but before the
- * device is registered.
- * @boardinfo_setup_data: Data argument passed to boardinfo_setup().
- */
-struct spi_gpio_platform_data {
- unsigned int pin_clk;
- unsigned int pin_miso;
- unsigned int pin_mosi;
- unsigned int pin_cs;
- bool cs_activelow;
- bool no_spi_delay;
- int (*boardinfo_setup)(struct spi_board_info *bi,
- struct spi_master *master,
- void *data);
- void *boardinfo_setup_data;
-};
-
-#endif /* _LINUX_SPI_SPI_GPIO */
---- a/drivers/spi/Kconfig
-+++ b/drivers/spi/Kconfig
-@@ -100,6 +100,11 @@
+Index: linux-2.6.25.10/include/linux/spi/spi_gpio.h
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-2.6.25.10/include/linux/spi/spi_gpio.h 2008-07-18 18:19:56.000000000 +0200
+@@ -0,0 +1,67 @@
++/*
++ * spi_gpio interface to platform code
++ *
++ * Copyright (c) 2008 Piotr Skamruk
++ * Copyright (c) 2008 Michael Buesch
++ *
++ * 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.
++ */
++#ifndef _LINUX_SPI_SPI_GPIO
++#define _LINUX_SPI_SPI_GPIO
++
++#include <linux/types.h>
++#include <linux/spi/spi.h>
++
++
++/** struct spi_gpio_platform_data - Data definitions for a SPI-GPIO device.
++ * This structure holds information about a GPIO-based SPI device.
++ *
++ * @pin_clk: The GPIO pin number of the CLOCK pin.
++ *
++ * @pin_miso: The GPIO pin number of the MISO pin.
++ *
++ * @pin_mosi: The GPIO pin number of the MOSI pin.
++ *
++ * @pin_cs: The GPIO pin number of the CHIPSELECT pin.
++ *
++ * @cs_activelow: If true, the chip is selected when the CS line is low.
++ *
++ * @no_spi_delay: If true, no delay is done in the lowlevel bitbanging.
++ * Note that doing no delay is not standards compliant,
++ * but it might be needed to speed up transfers on some
++ * slow embedded machines.
++ *
++ * @boardinfo_setup: This callback is called after the
++ * SPI master device was registered, but before the
++ * device is registered.
++ * @boardinfo_setup_data: Data argument passed to boardinfo_setup().
++ */
++struct spi_gpio_platform_data {
++ unsigned int pin_clk;
++ unsigned int pin_miso;
++ unsigned int pin_mosi;
++ unsigned int pin_cs;
++ bool cs_activelow;
++ bool no_spi_delay;
++ int (*boardinfo_setup)(struct spi_board_info *bi,
++ struct spi_master *master,
++ void *data);
++ void *boardinfo_setup_data;
++};
++
++/** SPI_GPIO_PLATDEV_NAME - The platform device name string.
++ * The name string that has to be used for platform_device_alloc
++ * when allocating a spi-gpio device.
++ */
++#define SPI_GPIO_PLATDEV_NAME "spi-gpio"
++
++/** spi_gpio_next_id - Get another platform device ID number.
++ * This returns the next platform device ID number that has to be used
++ * for platform_device_alloc. The ID is opaque and should not be used for
++ * anything else.
++ */
++int spi_gpio_next_id(void);
++
++#endif /* _LINUX_SPI_SPI_GPIO */
+Index: linux-2.6.25.10/drivers/spi/spi_gpio.c
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-2.6.25.10/drivers/spi/spi_gpio.c 2008-07-18 18:19:56.000000000 +0200
+@@ -0,0 +1,251 @@
++/*
++ * Bitbanging SPI bus driver using GPIO API
++ *
++ * Copyright (c) 2008 Piotr Skamruk
++ * Copyright (c) 2008 Michael Buesch
++ *
++ * based on spi_s3c2410_gpio.c
++ * Copyright (c) 2006 Ben Dooks
++ * Copyright (c) 2006 Simtec Electronics
++ * and on i2c-gpio.c
++ * Copyright (C) 2007 Atmel Corporation
++ *
++ * 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/kernel.h>
++#include <linux/init.h>
++#include <linux/delay.h>
++#include <linux/spinlock.h>
++#include <linux/workqueue.h>
++#include <linux/module.h>
++#include <linux/platform_device.h>
++#include <linux/spi/spi.h>
++#include <linux/spi/spi_bitbang.h>
++#include <linux/spi/spi_gpio.h>
++#include <linux/gpio.h>
++#include <asm/atomic.h>
++
++
++struct spi_gpio {
++ struct spi_bitbang bitbang;
++ struct spi_gpio_platform_data *info;
++ struct platform_device *pdev;
++ struct spi_board_info bi;
++};
++
++
++static inline struct spi_gpio *spidev_to_sg(struct spi_device *dev)
++{
++ return dev->controller_data;
++}
++
++static inline void setsck(struct spi_device *dev, int val)
++{
++ struct spi_gpio *sp = spidev_to_sg(dev);
++ gpio_set_value(sp->info->pin_clk, val ? 1 : 0);
++}
++
++static inline void setmosi(struct spi_device *dev, int val)
++{
++ struct spi_gpio *sp = spidev_to_sg(dev);
++ gpio_set_value(sp->info->pin_mosi, val ? 1 : 0);
++}
++
++static inline u32 getmiso(struct spi_device *dev)
++{
++ struct spi_gpio *sp = spidev_to_sg(dev);
++ return gpio_get_value(sp->info->pin_miso) ? 1 : 0;
++}
++
++static inline void do_spidelay(struct spi_device *dev, unsigned nsecs)
++{
++ struct spi_gpio *sp = spidev_to_sg(dev);
++
++ if (!sp->info->no_spi_delay)
++ ndelay(nsecs);
++}
++
++#define spidelay(nsecs) do { \
++ /* Steal the spi_device pointer from our caller. \
++ * The bitbang-API should probably get fixed here... */ \
++ do_spidelay(spi, nsecs); \
++ } while (0)
++
++#define EXPAND_BITBANG_TXRX
++#include <linux/spi/spi_bitbang.h>
++
++static u32 spi_gpio_txrx_mode0(struct spi_device *spi,
++ unsigned nsecs, u32 word, u8 bits)
++{
++ return bitbang_txrx_be_cpha0(spi, nsecs, 0, word, bits);
++}
++
++static u32 spi_gpio_txrx_mode1(struct spi_device *spi,
++ unsigned nsecs, u32 word, u8 bits)
++{
++ return bitbang_txrx_be_cpha1(spi, nsecs, 0, word, bits);
++}
++
++static u32 spi_gpio_txrx_mode2(struct spi_device *spi,
++ unsigned nsecs, u32 word, u8 bits)
++{
++ return bitbang_txrx_be_cpha0(spi, nsecs, 1, word, bits);
++}
++
++static u32 spi_gpio_txrx_mode3(struct spi_device *spi,
++ unsigned nsecs, u32 word, u8 bits)
++{
++ return bitbang_txrx_be_cpha1(spi, nsecs, 1, word, bits);
++}
++
++static void spi_gpio_chipselect(struct spi_device *dev, int on)
++{
++ struct spi_gpio *sp = spidev_to_sg(dev);
++
++ if (sp->info->cs_activelow)
++ on = !on;
++ gpio_set_value(sp->info->pin_cs, on ? 1 : 0);
++}
++
++static int spi_gpio_probe(struct platform_device *pdev)
++{
++ struct spi_master *master;
++ struct spi_gpio_platform_data *pdata;
++ struct spi_gpio *sp;
++ struct spi_device *spidev;
++ int err;
++
++ pdata = pdev->dev.platform_data;
++ if (!pdata)
++ return -ENXIO;
++
++ err = -ENOMEM;
++ master = spi_alloc_master(&pdev->dev, sizeof(struct spi_gpio));
++ if (!master)
++ goto err_alloc_master;
++
++ sp = spi_master_get_devdata(master);
++ platform_set_drvdata(pdev, sp);
++ sp->info = pdata;
++
++ err = gpio_request(pdata->pin_clk, "spi_clock");
++ if (err)
++ goto err_request_clk;
++ err = gpio_request(pdata->pin_mosi, "spi_mosi");
++ if (err)
++ goto err_request_mosi;
++ err = gpio_request(pdata->pin_miso, "spi_miso");
++ if (err)
++ goto err_request_miso;
++ err = gpio_request(pdata->pin_cs, "spi_cs");
++ if (err)
++ goto err_request_cs;
++
++ sp->bitbang.master = spi_master_get(master);
++ sp->bitbang.master->bus_num = -1;
++ sp->bitbang.master->num_chipselect = 1;
++ sp->bitbang.chipselect = spi_gpio_chipselect;
++ sp->bitbang.txrx_word[SPI_MODE_0] = spi_gpio_txrx_mode0;
++ sp->bitbang.txrx_word[SPI_MODE_1] = spi_gpio_txrx_mode1;
++ sp->bitbang.txrx_word[SPI_MODE_2] = spi_gpio_txrx_mode2;
++ sp->bitbang.txrx_word[SPI_MODE_3] = spi_gpio_txrx_mode3;
++
++ gpio_direction_output(pdata->pin_clk, 0);
++ gpio_direction_output(pdata->pin_mosi, 0);
++ gpio_direction_output(pdata->pin_cs,
++ pdata->cs_activelow ? 1 : 0);
++ gpio_direction_input(pdata->pin_miso);
++
++ err = spi_bitbang_start(&sp->bitbang);
++ if (err)
++ goto err_no_bitbang;
++ err = pdata->boardinfo_setup(&sp->bi, master,
++ pdata->boardinfo_setup_data);
++ if (err)
++ goto err_bi_setup;
++ sp->bi.controller_data = sp;
++ spidev = spi_new_device(master, &sp->bi);
++ if (!spidev)
++ goto err_new_dev;
++
++ return 0;
++
++err_new_dev:
++err_bi_setup:
++ spi_bitbang_stop(&sp->bitbang);
++err_no_bitbang:
++ spi_master_put(sp->bitbang.master);
++ gpio_free(pdata->pin_cs);
++err_request_cs:
++ gpio_free(pdata->pin_miso);
++err_request_miso:
++ gpio_free(pdata->pin_mosi);
++err_request_mosi:
++ gpio_free(pdata->pin_clk);
++err_request_clk:
++ kfree(master);
++
++err_alloc_master:
++ return err;
++}
++
++static int __devexit spi_gpio_remove(struct platform_device *pdev)
++{
++ struct spi_gpio *sp;
++ struct spi_gpio_platform_data *pdata;
++
++ pdata = pdev->dev.platform_data;
++ sp = platform_get_drvdata(pdev);
++
++ gpio_free(pdata->pin_clk);
++ gpio_free(pdata->pin_mosi);
++ gpio_free(pdata->pin_miso);
++ gpio_free(pdata->pin_cs);
++ spi_bitbang_stop(&sp->bitbang);
++ spi_master_put(sp->bitbang.master);
++
++ return 0;
++}
++
++static struct platform_driver spi_gpio_driver = {
++ .driver = {
++ .name = SPI_GPIO_PLATDEV_NAME,
++ .owner = THIS_MODULE,
++ },
++ .probe = spi_gpio_probe,
++ .remove = __devexit_p(spi_gpio_remove),
++};
++
++int spi_gpio_next_id(void)
++{
++ static atomic_t counter = ATOMIC_INIT(-1);
++
++ return atomic_inc_return(&counter);
++}
++EXPORT_SYMBOL(spi_gpio_next_id);
++
++static int __init spi_gpio_init(void)
++{
++ int err;
++
++ err = platform_driver_register(&spi_gpio_driver);
++ if (err)
++ printk(KERN_ERR "spi-gpio: register failed: %d\n", err);
++
++ return err;
++}
++module_init(spi_gpio_init);
++
++static void __exit spi_gpio_exit(void)
++{
++ platform_driver_unregister(&spi_gpio_driver);
++}
++module_exit(spi_gpio_exit);
++
++MODULE_AUTHOR("Piot Skamruk <piotr.skamruk at gmail.com>");
++MODULE_AUTHOR("Michael Buesch");
++MODULE_DESCRIPTION("Platform independent GPIO bitbanging SPI driver");
++MODULE_LICENSE("GPL v2");
+Index: linux-2.6.25.10/drivers/spi/Kconfig
+===================================================================
+--- linux-2.6.25.10.orig/drivers/spi/Kconfig 2008-07-18 18:19:43.000000000 +0200
++++ linux-2.6.25.10/drivers/spi/Kconfig 2008-07-18 18:19:56.000000000 +0200
+@@ -100,6 +100,19 @@ config SPI_BUTTERFLY
inexpensive battery powered microcontroller evaluation board.
This same cable can be used to flash new firmware.
+config SPI_GPIO
+ tristate "GPIO API based bitbanging SPI controller"
-+ depends on SPI_MASTER && GENERIC_GPIO && EXPERIMENTAL
++ depends on SPI_MASTER && GENERIC_GPIO
+ select SPI_BITBANG
++ help
++ This is a platform driver that can be used for bitbanging
++ an SPI bus over GPIO pins.
++ Select this, if you have any SPI device that is connected via
++ GPIO pins.
++ The module will be called spi_gpio.
++
++ If unsure, say N.
+
config SPI_IMX
tristate "Freescale iMX SPI controller"
depends on SPI_MASTER && ARCH_IMX && EXPERIMENTAL
---- a/drivers/spi/Makefile
-+++ b/drivers/spi/Makefile
-@@ -16,6 +16,7 @@
+Index: linux-2.6.25.10/drivers/spi/Makefile
+===================================================================
+--- linux-2.6.25.10.orig/drivers/spi/Makefile 2008-07-18 18:19:43.000000000 +0200
++++ linux-2.6.25.10/drivers/spi/Makefile 2008-07-18 18:19:56.000000000 +0200
+@@ -16,6 +16,7 @@ obj-$(CONFIG_SPI_BFIN) += spi_bfin5xx.
obj-$(CONFIG_SPI_BITBANG) += spi_bitbang.o
obj-$(CONFIG_SPI_AU1550) += au1550_spi.o
obj-$(CONFIG_SPI_BUTTERFLY) += spi_butterfly.o
obj-$(CONFIG_SPI_IMX) += spi_imx.o
obj-$(CONFIG_SPI_LM70_LLP) += spi_lm70llp.o
obj-$(CONFIG_SPI_PXA2XX) += pxa2xx_spi.o
+Index: linux-2.6.25.10/MAINTAINERS
+===================================================================
+--- linux-2.6.25.10.orig/MAINTAINERS 2008-07-03 05:46:47.000000000 +0200
++++ linux-2.6.25.10/MAINTAINERS 2008-07-18 18:20:28.000000000 +0200
+@@ -3685,6 +3685,11 @@ M: dbrownell@users.sourceforge.net
+ L: spi-devel-general@lists.sourceforge.net
+ S: Maintained
+
++SPI GPIO MASTER DRIVER
++P: Michael Buesch
++M: mb@bu3sch.de
++S: Maintained
++
+ STABLE BRANCH:
+ P: Greg Kroah-Hartman
+ M: greg@kroah.com
--- /dev/null
+Index: linux-2.6.25.10/drivers/mmc/host/gpiommc.c
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-2.6.25.10/drivers/mmc/host/gpiommc.c 2008-07-18 22:31:00.000000000 +0200
+@@ -0,0 +1,328 @@
++/*
++ * Driver an MMC/SD card on a bitbanging GPIO SPI bus.
++ * This module hooks up the mmc_spi and spi_gpio modules and also
++ * provides a sysfs interface.
++ *
++ * Copyright 2008 Michael Buesch <mb@bu3sch.de>
++ *
++ * Licensed under the GNU/GPL. See COPYING for details.
++ */
++
++#include <linux/mmc/gpiommc.h>
++#include <linux/platform_device.h>
++#include <linux/list.h>
++#include <linux/mutex.h>
++#include <linux/spi/spi_gpio.h>
++
++
++#define PFX "gpio-mmc: "
++#define GPIOMMC_MAX_NAMELEN_STR __stringify(GPIOMMC_MAX_NAMELEN)
++
++struct gpiommc_device {
++ struct platform_device *pdev;
++ struct platform_device *spi_pdev;
++ struct spi_board_info boardinfo;
++};
++
++
++MODULE_DESCRIPTION("GPIO based MMC driver");
++MODULE_AUTHOR("Michael Buesch");
++MODULE_LICENSE("GPL");
++
++
++static int gpiommc_boardinfo_setup(struct spi_board_info *bi,
++ struct spi_master *master,
++ void *data)
++{
++ struct gpiommc_device *d = data;
++ struct gpiommc_platform_data *pdata = d->pdev->dev.platform_data;
++
++ /* Bind the SPI master to the MMC-SPI host driver. */
++ strlcpy(bi->modalias, "mmc_spi", sizeof(bi->modalias));
++
++ bi->max_speed_hz = pdata->max_bus_speed;
++ bi->bus_num = master->bus_num;
++ bi->mode = pdata->mode;
++
++ return 0;
++}
++
++static int gpiommc_probe(struct platform_device *pdev)
++{
++ struct gpiommc_platform_data *mmc_pdata = pdev->dev.platform_data;
++ struct spi_gpio_platform_data spi_pdata;
++ struct gpiommc_device *d;
++ int err;
++
++ err = -ENXIO;
++ if (!mmc_pdata)
++ goto error;
++
++ /* Allocate the GPIO-MMC device */
++ err = -ENOMEM;
++ d = kzalloc(sizeof(*d), GFP_KERNEL);
++ if (!d)
++ goto error;
++ d->pdev = pdev;
++
++ /* Create the SPI-GPIO device */
++ d->spi_pdev = platform_device_alloc(SPI_GPIO_PLATDEV_NAME,
++ spi_gpio_next_id());
++ if (!d->spi_pdev)
++ goto err_free_d;
++
++ memset(&spi_pdata, 0, sizeof(spi_pdata));
++ spi_pdata.pin_clk = mmc_pdata->pins.gpio_clk;
++ spi_pdata.pin_miso = mmc_pdata->pins.gpio_do;
++ spi_pdata.pin_mosi = mmc_pdata->pins.gpio_di;
++ spi_pdata.pin_cs = mmc_pdata->pins.gpio_cs;
++ spi_pdata.cs_activelow = mmc_pdata->pins.cs_activelow;
++ spi_pdata.no_spi_delay = mmc_pdata->no_spi_delay;
++ spi_pdata.boardinfo_setup = gpiommc_boardinfo_setup;
++ spi_pdata.boardinfo_setup_data = d;
++
++ err = platform_device_add_data(d->spi_pdev, &spi_pdata,
++ sizeof(spi_pdata));
++ if (err)
++ goto err_free_pdev;
++ err = platform_device_add(d->spi_pdev);
++ if (err)
++ goto err_free_pdata;
++ platform_set_drvdata(pdev, d);
++
++ printk(KERN_INFO PFX "MMC-Card \"%s\" "
++ "attached to GPIO pins di=%u, do=%u, clk=%u, cs=%u\n",
++ mmc_pdata->name, mmc_pdata->pins.gpio_di,
++ mmc_pdata->pins.gpio_do,
++ mmc_pdata->pins.gpio_clk,
++ mmc_pdata->pins.gpio_cs);
++
++ return 0;
++
++err_free_pdata:
++ kfree(d->spi_pdev->dev.platform_data);
++ d->spi_pdev->dev.platform_data = NULL;
++err_free_pdev:
++ platform_device_put(d->spi_pdev);
++err_free_d:
++ kfree(d);
++error:
++ return err;
++}
++
++static int gpiommc_remove(struct platform_device *pdev)
++{
++ struct gpiommc_device *d = platform_get_drvdata(pdev);
++ struct gpiommc_platform_data *pdata = d->pdev->dev.platform_data;
++
++ platform_device_unregister(d->spi_pdev);
++ printk(KERN_INFO PFX "GPIO based MMC-Card \"%s\" removed\n", pdata->name);
++ platform_device_put(d->spi_pdev);
++
++ return 0;
++}
++
++/* Wrapper for the platform data with context data for the sysfs interface. */
++struct gpiommc_sysfs_platform_data {
++ struct gpiommc_platform_data p; /* Keep as first element */
++
++ /* The platform device that we allocated. */
++ struct platform_device *pdev;
++ /* gpiommc_sysfs_list */
++ struct list_head list;
++};
++
++static LIST_HEAD(gpiommc_sysfs_list);
++static DEFINE_MUTEX(gpiommc_sysfs_mutex);
++
++static struct gpiommc_sysfs_platform_data *gpiommc_sysfs_find_dev(const char *name)
++{
++ struct gpiommc_sysfs_platform_data *pdata;
++
++ list_for_each_entry(pdata, &gpiommc_sysfs_list, list) {
++ if (strcmp(pdata->p.name, name) == 0)
++ return pdata;
++ }
++
++ return NULL;
++}
++
++static ssize_t gpiommc_add_store(struct device_driver *drv,
++ const char *buf, size_t count)
++{
++ int res, err;
++ struct gpiommc_sysfs_platform_data pdata_local, *pdata;
++ struct platform_device *pdev;
++ unsigned int no_spi_delay = 0, mode = 0, csactivelow = 0;
++
++ mutex_lock(&gpiommc_sysfs_mutex);
++
++ pdata = &pdata_local;
++ memset(pdata, 0, sizeof(*pdata));
++
++ err = -EINVAL;
++ res = sscanf(buf, "%" GPIOMMC_MAX_NAMELEN_STR "s %u %u %u %u %u %u %u %u",
++ pdata->p.name,
++ &pdata->p.pins.gpio_di,
++ &pdata->p.pins.gpio_do,
++ &pdata->p.pins.gpio_clk,
++ &pdata->p.pins.gpio_cs,
++ &mode,
++ &pdata->p.max_bus_speed,
++ &no_spi_delay,
++ &csactivelow);
++ pdata->p.mode = mode;
++ pdata->p.no_spi_delay = !!no_spi_delay;
++ pdata->p.pins.cs_activelow = !!csactivelow;
++ if (res < 9)
++ pdata->p.pins.cs_activelow = 1; /* Default: CS = activelow */
++ if (res < 8)
++ pdata->p.no_spi_delay = 0; /* Default: Delay turned on */
++ if (res < 7)
++ pdata->p.max_bus_speed = 5000000; /* Default: 5Mhz */
++ if (res < 6)
++ pdata->p.mode = 0; /* Default: SPI mode 0 */
++ if (res < 5 || res > 9)
++ goto out; /* First 5 args are mandatory. */
++
++ /* Convert mode so that the SPI subsystem does understand it. */
++ switch (pdata->p.mode) {
++ case 0:
++ pdata->p.mode = SPI_MODE_0;
++ break;
++ case 1:
++ pdata->p.mode = SPI_MODE_1;
++ break;
++ case 2:
++ pdata->p.mode = SPI_MODE_2;
++ break;
++ case 3:
++ pdata->p.mode = SPI_MODE_3;
++ break;
++ default:
++ goto out; /* Invalid mode */
++ }
++
++ err = -EEXIST;
++ if (gpiommc_sysfs_find_dev(pdata->p.name))
++ goto out;
++
++ err = -ENOMEM;
++ pdev = platform_device_alloc(GPIOMMC_PLATDEV_NAME, gpiommc_next_id());
++ if (!pdev)
++ goto out;
++
++ err = platform_device_add_data(pdev, pdata, sizeof(*pdata));
++ if (err)
++ goto err_free_pdev;
++ pdata = pdev->dev.platform_data;
++
++ err = platform_device_add(pdev);
++ if (err)
++ goto err_free_pdev;
++
++ pdata->pdev = pdev;
++ INIT_LIST_HEAD(&pdata->list);
++ list_add(&pdata->list, &gpiommc_sysfs_list);
++
++ err = 0;
++out:
++ mutex_unlock(&gpiommc_sysfs_mutex);
++
++ return err ? err : count;
++
++err_free_pdev:
++ platform_device_put(pdev);
++ goto out;
++}
++
++static ssize_t gpiommc_remove_store(struct device_driver *drv,
++ const char *buf, size_t count)
++{
++ struct gpiommc_sysfs_platform_data *pdata;
++ int err;
++
++ mutex_lock(&gpiommc_sysfs_mutex);
++
++ err = -ENODEV;
++ pdata = gpiommc_sysfs_find_dev(buf);
++ if (!pdata)
++ goto out;
++
++ list_del(&pdata->list);
++ platform_device_unregister(pdata->pdev);
++
++out:
++ mutex_unlock(&gpiommc_sysfs_mutex);
++
++ return err ? err : count;
++}
++
++static DRIVER_ATTR(add, 0200,
++ NULL, gpiommc_add_store);
++static DRIVER_ATTR(remove, 0200,
++ NULL, gpiommc_remove_store);
++
++static struct platform_driver gpiommc_plat_driver = {
++ .probe = gpiommc_probe,
++ .remove = gpiommc_remove,
++ .driver = {
++ .name = GPIOMMC_PLATDEV_NAME,
++ .owner = THIS_MODULE,
++ },
++};
++
++int gpiommc_next_id(void)
++{
++ static atomic_t counter = ATOMIC_INIT(-1);
++
++ return atomic_inc_return(&counter);
++}
++EXPORT_SYMBOL(gpiommc_next_id);
++
++static int __init gpiommc_modinit(void)
++{
++ int err;
++
++ err = platform_driver_register(&gpiommc_plat_driver);
++ if (err)
++ return err;
++ err = driver_create_file(&gpiommc_plat_driver.driver,
++ &driver_attr_add);
++ if (err)
++ goto err_drv_unreg;
++ err = driver_create_file(&gpiommc_plat_driver.driver,
++ &driver_attr_remove);
++ if (err)
++ goto err_remove_add;
++
++ return 0;
++
++err_remove_add:
++ driver_remove_file(&gpiommc_plat_driver.driver,
++ &driver_attr_add);
++err_drv_unreg:
++ platform_driver_unregister(&gpiommc_plat_driver);
++ return err;
++}
++module_init(gpiommc_modinit);
++
++static void __exit gpiommc_modexit(void)
++{
++ struct gpiommc_sysfs_platform_data *pdata, *pdata_tmp;
++
++ driver_remove_file(&gpiommc_plat_driver.driver,
++ &driver_attr_remove);
++ driver_remove_file(&gpiommc_plat_driver.driver,
++ &driver_attr_add);
++
++ mutex_lock(&gpiommc_sysfs_mutex);
++ list_for_each_entry_safe(pdata, pdata_tmp, &gpiommc_sysfs_list, list) {
++ list_del(&pdata->list);
++ platform_device_unregister(pdata->pdev);
++ }
++ mutex_unlock(&gpiommc_sysfs_mutex);
++
++ platform_driver_unregister(&gpiommc_plat_driver);
++}
++module_exit(gpiommc_modexit);
+Index: linux-2.6.25.10/drivers/mmc/host/Kconfig
+===================================================================
+--- linux-2.6.25.10.orig/drivers/mmc/host/Kconfig 2008-07-18 22:30:36.000000000 +0200
++++ linux-2.6.25.10/drivers/mmc/host/Kconfig 2008-07-18 22:31:00.000000000 +0200
+@@ -130,3 +130,23 @@ config MMC_SPI
+
+ If unsure, or if your system has no SPI master driver, say N.
+
++config GPIOMMC
++ tristate "MMC/SD over GPIO-based SPI"
++ depends on MMC && MMC_SPI && SPI_GPIO
++ help
++ This driver hooks up the mmc_spi and spi_gpio modules so that
++ MMC/SD cards can be used on a GPIO based bus by bitbanging
++ the SPI protocol in software.
++
++ This driver provides a sysfs interface to dynamically create
++ and destroy GPIO-based MMC/SD card interfaces. It also provides
++ a platform device interface API.
++ See Documentation/gpiommc.txt for details.
++
++ The module will be called gpiommc.
++
++ If unsure, say N.
++
++config MMC_S3C
++ tristate "Samsung S3C SD/MMC Card Interface support"
++ depends on ARCH_S3C2410 && MMC
+Index: linux-2.6.25.10/drivers/mmc/host/Makefile
+===================================================================
+--- linux-2.6.25.10.orig/drivers/mmc/host/Makefile 2008-07-18 22:30:36.000000000 +0200
++++ linux-2.6.25.10/drivers/mmc/host/Makefile 2008-07-18 22:31:20.000000000 +0200
+@@ -18,3 +18,4 @@ obj-$(CONFIG_MMC_AT91) += at91_mci.o
+ obj-$(CONFIG_MMC_TIFM_SD) += tifm_sd.o
+ obj-$(CONFIG_MMC_SPI) += mmc_spi.o
+
++obj-$(CONFIG_GPIOMMC) += gpiommc.o
+Index: linux-2.6.25.10/include/linux/mmc/gpiommc.h
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-2.6.25.10/include/linux/mmc/gpiommc.h 2008-07-18 22:31:00.000000000 +0200
+@@ -0,0 +1,62 @@
++/*
++ * Device driver for MMC/SD cards driven over a GPIO bus.
++ *
++ * Copyright (c) 2008 Michael Buesch
++ *
++ * Licensed under the GNU/GPL version 2.
++ */
++#ifndef LINUX_GPIOMMC_H_
++#define LINUX_GPIOMMC_H_
++
++#include <linux/types.h>
++
++
++#define GPIOMMC_MAX_NAMELEN 15
++
++/** struct gpiommc_pins - Hardware pin assignments
++ * @gpio_di: The GPIO number of the DATA IN pin
++ * @gpio_do: The GPIO number of the DATA OUT pin
++ * @gpio_clk: The GPIO number of the CLOCK pin
++ * @gpio_cs: The GPIO number of the CHIPSELECT pin
++ * @cs_activelow: If true, the chip is considered selected if @gpio_cs is low.
++ */
++struct gpiommc_pins {
++ unsigned int gpio_di;
++ unsigned int gpio_do;
++ unsigned int gpio_clk;
++ unsigned int gpio_cs;
++ bool cs_activelow;
++};
++
++/** struct gpiommc_platform_data - Platform data for a MMC-over-SPI-GPIO device.
++ * @name: The unique name string of the device.
++ * @pins: The hardware pin assignments.
++ * @mode: The hardware mode. This is either SPI_MODE_0,
++ * SPI_MODE_1, SPI_MODE_2 or SPI_MODE_3. See the SPI documentation.
++ * @no_spi_delay: Do not use delays in the lowlevel SPI bitbanging code.
++ * This is not standards compliant, but may be required for some
++ * embedded machines to gain reasonable speed.
++ * @max_bus_speed: The maximum speed of the SPI bus, in Hertz.
++ */
++struct gpiommc_platform_data {
++ char name[GPIOMMC_MAX_NAMELEN + 1];
++ struct gpiommc_pins pins;
++ u8 mode;
++ bool no_spi_delay;
++ unsigned int max_bus_speed;
++};
++
++/** GPIOMMC_PLATDEV_NAME - The platform device name string.
++ * The name string that has to be used for platform_device_alloc
++ * when allocating a gpiommc device.
++ */
++#define GPIOMMC_PLATDEV_NAME "gpiommc"
++
++/** gpiommc_next_id - Get another platform device ID number.
++ * This returns the next platform device ID number that has to be used
++ * for platform_device_alloc. The ID is opaque and should not be used for
++ * anything else.
++ */
++int gpiommc_next_id(void);
++
++#endif /* LINUX_GPIOMMC_H_ */
+Index: linux-2.6.25.10/Documentation/gpiommc.txt
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-2.6.25.10/Documentation/gpiommc.txt 2008-07-18 22:31:00.000000000 +0200
+@@ -0,0 +1,96 @@
++GPIOMMC - Driver for an MMC/SD card on a bitbanging GPIO SPI bus
++================================================================
++
++The gpiommc module hooks up the mmc_spi and spi_gpio modules for running an
++MMC or SD card on GPIO pins.
++
++Two interfaces for registering a new MMC/SD card device are provided.
++A static platform-device based mechanism and a dynamic sysfs based interface.
++
++
++Registering devices via platform-device
++=======================================
++
++The platform-device interface is used for registering MMC/SD devices that are
++part of the hardware platform. This is most useful only for embedded machines
++with MMC/SD devices statically connected to the platform GPIO bus.
++
++The data structures are declared in <linux/mmc/gpiommc.h>
++
++To register a new device, define an instance of struct gpiommc_platform_data.
++This structure holds any information about how the device is hooked up to the
++GPIO pins and what hardware modes the device supports. See the docbook-style
++documentation in the header file for more information on the struct fields.
++
++Then allocate a new instance of a platform device by doing:
++
++ pdev = platform_device_alloc(GPIOMMC_PLATDEV_NAME, gpiommc_next_id());
++
++This will allocate the platform device data structures and hook it up to the
++gpiommc driver.
++Then add the gpiommc_platform_data to the platform device.
++
++ err = platform_device_add_data(pdev, pdata, sizeof(struct gpiommc_platform_data));
++
++You may free the local instance of struct gpiommc_platform_data now.
++Now simply register the platform device.
++
++ err = platform_device_add(pdev);
++
++Done. The gpiommc probe routine should be called and you should see a dmesg
++message for the added device.
++
++
++Registering devices via sysfs
++=============================
++
++MMC/SD cards connected via GPIO often are a pretty dynamic thing. For example
++selfmade hacks for soldering an MMC/SD card to standard GPIO pins on embedded
++hardware are a common situation.
++So we provide a dynamic interface to conveniently handle adding and removing
++devices from userspace, without the need to recompile the kernel.
++
++There are two sysfs files responsible for that:
++export ADD=/sys/bus/platform/drivers/gpiommc/add
++export REMOVE=/sys/bus/platform/drivers/gpiommc/remove
++
++To add a new device, simply echo the configuration string to the "add" file.
++The config string is composed out of the following elements:
++
++DEVNAME DIpin DOpin CLKpin CSpin SPIMODE MAXBUSSPEED NO_SPI_DELAY CSACTIVELOW
++
++DEVNAME is a unique name string for the device.
++DIpin is the SPI DI GPIO pin.
++DOpin is the SPI DO GPIO pin.
++CLKpin is the SPI CLOCK GPIO pin.
++CSpin is the SPI CHIPSELECT GPIO pin.
++SPIMODE is the hardware mode the device will run at. Can be 0-3.
++MAXBUSSPEED is the maximum bus speed in Hertz.
++NO_SPI_DELAY can be 1 or 0. If it is 1, then the lowlevel SPI delay
++will not be performed. This is not standards compliant, but may be required
++to gain reasonable speeds on embedded hardware.
++CSACTIVELOW can be 1 or 0. If it is 1, the chip is considered to be selected, if CS
++is at a logical 0.
++
++Note that the elements SPIMODE, MAXBUSSPEED and NO_SPI_DELAY are optional
++and can be omitted.
++SPIMODE will default to 0.
++MAXBUSSSPEED will default to 5Mhz.
++NO_SPI_DELAY will default to 0.
++CSACTIVELOW will default to 1.
++
++Example:
++
++ echo -n "my_device 5 4 3 7 0 1000000 1" > $ADD
++
++This will add a new device called "my_device" with the GPIO pins assigned as
++DI=5, DO=4, CLK=3, CS=7
++The hardware mode will be SPI_MODE_0.
++The maximum bus speed will be 1000000 Hz (1Mhz)
++And the explicit SPI delay at the lowlevel bitbang loop will be switched off.
++
++To remove a device, simply echo the device name string to the "remove" file.
++
++Example:
++
++ echo -n "my_device" > $REMOVE
+Index: linux-2.6.25.10/MAINTAINERS
+===================================================================
+--- linux-2.6.25.10.orig/MAINTAINERS 2008-07-18 22:30:41.000000000 +0200
++++ linux-2.6.25.10/MAINTAINERS 2008-07-18 22:31:00.000000000 +0200
+@@ -1736,6 +1736,11 @@ L: gigaset307x-common@lists.sourceforge.
+ W: http://gigaset307x.sourceforge.net/
+ S: Maintained
+
++GPIOMMC DRIVER
++P: Michael Buesch
++M: mb@bu3sch.de
++S: Maintained
++
+ HARDWARE MONITORING
+ P: Mark M. Hoffman
+ M: mhoffman@lightlink.com
projects / openwrt.git / commitdiff