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Update GPIO-based MMC driver

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SVN-Revision: 11864
This commit is contained in:
Michael Büsch 2008-07-18 20:53:08 +00:00
parent 9d5543e8b9
commit f4b516ef34
8 changed files with 922 additions and 655 deletions
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14
package/mmc_over_gpio/Makefile
View file

@ -4,8 +4,6 @@
# This is free software, licensed under the GNU General Public License v2. # This is free software, licensed under the GNU General Public License v2.
# See /LICENSE for more information. # See /LICENSE for more information.
#XXX This package will go away once the stuff is merged into the kernel.
include $(TOPDIR)/rules.mk include $(TOPDIR)/rules.mk
include $(INCLUDE_DIR)/kernel.mk include $(INCLUDE_DIR)/kernel.mk
@ -18,9 +16,10 @@ include $(INCLUDE_DIR)/package.mk
define KernelPackage/mmc-over-gpio define KernelPackage/mmc-over-gpio
SUBMENU:=Other modules SUBMENU:=Other modules
DEPENDS:=@GPIO_SUPPORT +kmod-mmc-spi +kmod-spi-gpio DEPENDS:=@GPIO_SUPPORT +kmod-mmc-spi +kmod-spi-gpio
KCONFIG:=CONFIG_GPIOMMC
TITLE:=MMC/SD card over GPIO support TITLE:=MMC/SD card over GPIO support
FILES:=$(PKG_BUILD_DIR)/mmc_over_spigpio.$(LINUX_KMOD_SUFFIX) FILES:=$(LINUX_DIR)/drivers/mmc/host/gpiommc.$(LINUX_KMOD_SUFFIX)
AUTOLOAD:=$(call AutoLoad,93,spi_gpio mmc_over_spigpio) AUTOLOAD:=$(call AutoLoad,93,spi_gpio gpiommc)
endef endef
define KernelPackage/mmc-over-gpio/description define KernelPackage/mmc-over-gpio/description
@ -29,16 +28,9 @@ endef
define Build/Prepare define Build/Prepare
mkdir -p $(PKG_BUILD_DIR) mkdir -p $(PKG_BUILD_DIR)
$(CP) ./src/* $(PKG_BUILD_DIR)/
endef endef
define Build/Compile define Build/Compile
$(MAKE) -C "$(LINUX_DIR)" \
CROSS_COMPILE="$(TARGET_CROSS)" \
ARCH="$(LINUX_KARCH)" \
SUBDIRS="$(PKG_BUILD_DIR)" \
EXTRA_CFLAGS="$(BUILDFLAGS)" \
modules
endef endef
define KernelPackage/mmc-over-gpio/install define KernelPackage/mmc-over-gpio/install

4
package/mmc_over_gpio/files/mmc_over_gpio.init
View file

@ -3,11 +3,11 @@
START=90 START=90
SYSFS="/sys" 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(name, DI_pin, DO_pin, CLK_pin, CS_pin, mode)
add_device() { 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) # remove_device(name)

1
package/mmc_over_gpio/src/Makefile
View file

@ -1 +0,0 @@
obj-m += mmc_over_spigpio.o

339
package/mmc_over_gpio/src/mmc_over_spigpio.c
View file

@ -1,339 +0,0 @@
/*
* 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);

242
target/linux/generic-2.6/files-2.6.25/drivers/spi/spi_gpio.c
View file

@ -1,242 +0,0 @@
/*
* 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");

53
target/linux/generic-2.6/files-2.6.25/include/linux/spi/spi_gpio.h
View file

@ -1,53 +0,0 @@
/*
* 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 */

370
target/linux/generic-2.6/patches-2.6.25/921-gpio_spi_driver.patch
View file

@ -1,20 +1,360 @@
--- a/drivers/spi/Kconfig Index: linux-2.6.25.10/include/linux/spi/spi_gpio.h
+++ b/drivers/spi/Kconfig ===================================================================
@@ -100,6 +100,11 @@ --- /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. inexpensive battery powered microcontroller evaluation board.
This same cable can be used to flash new firmware. This same cable can be used to flash new firmware.
+config SPI_GPIO +config SPI_GPIO
+ tristate "GPIO API based bitbanging SPI controller" + tristate "GPIO API based bitbanging SPI controller"
+ depends on SPI_MASTER && GENERIC_GPIO && EXPERIMENTAL + depends on SPI_MASTER && GENERIC_GPIO
+ select SPI_BITBANG + 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 config SPI_IMX
tristate "Freescale iMX SPI controller" tristate "Freescale iMX SPI controller"
depends on SPI_MASTER && ARCH_IMX && EXPERIMENTAL depends on SPI_MASTER && ARCH_IMX && EXPERIMENTAL
--- a/drivers/spi/Makefile Index: linux-2.6.25.10/drivers/spi/Makefile
+++ b/drivers/spi/Makefile ===================================================================
@@ -16,6 +16,7 @@ --- 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-$(CONFIG_SPI_BITBANG) += spi_bitbang.o
obj-$(CONFIG_SPI_AU1550) += au1550_spi.o obj-$(CONFIG_SPI_AU1550) += au1550_spi.o
obj-$(CONFIG_SPI_BUTTERFLY) += spi_butterfly.o obj-$(CONFIG_SPI_BUTTERFLY) += spi_butterfly.o
@ -22,3 +362,19 @@
obj-$(CONFIG_SPI_IMX) += spi_imx.o obj-$(CONFIG_SPI_IMX) += spi_imx.o
obj-$(CONFIG_SPI_LM70_LLP) += spi_lm70llp.o obj-$(CONFIG_SPI_LM70_LLP) += spi_lm70llp.o
obj-$(CONFIG_SPI_PXA2XX) += pxa2xx_spi.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

554
target/linux/generic-2.6/patches-2.6.25/922-gpiommc.patch Normal file
View file

@ -0,0 +1,554 @@
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