555 lines
16 KiB
Diff
555 lines
16 KiB
Diff
Index: linux-2.6.25.10/drivers/mmc/host/gpiommc.c
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===================================================================
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--- /dev/null 1970-01-01 00:00:00.000000000 +0000
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+++ linux-2.6.25.10/drivers/mmc/host/gpiommc.c 2008-07-18 22:31:00.000000000 +0200
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@@ -0,0 +1,328 @@
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+/*
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+ * Driver an MMC/SD card on a bitbanging GPIO SPI bus.
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+ * This module hooks up the mmc_spi and spi_gpio modules and also
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+ * provides a sysfs interface.
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+ *
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+ * Copyright 2008 Michael Buesch <mb@bu3sch.de>
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+ *
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+ * Licensed under the GNU/GPL. See COPYING for details.
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+ */
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+
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+#include <linux/mmc/gpiommc.h>
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+#include <linux/platform_device.h>
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+#include <linux/list.h>
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+#include <linux/mutex.h>
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+#include <linux/spi/spi_gpio.h>
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+
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+
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+#define PFX "gpio-mmc: "
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+#define GPIOMMC_MAX_NAMELEN_STR __stringify(GPIOMMC_MAX_NAMELEN)
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+
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+struct gpiommc_device {
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+ struct platform_device *pdev;
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+ struct platform_device *spi_pdev;
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+ struct spi_board_info boardinfo;
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+};
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+
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+
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+MODULE_DESCRIPTION("GPIO based MMC driver");
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+MODULE_AUTHOR("Michael Buesch");
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+MODULE_LICENSE("GPL");
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+
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+
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+static int gpiommc_boardinfo_setup(struct spi_board_info *bi,
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+ struct spi_master *master,
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+ void *data)
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+{
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+ struct gpiommc_device *d = data;
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+ struct gpiommc_platform_data *pdata = d->pdev->dev.platform_data;
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+
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+ /* Bind the SPI master to the MMC-SPI host driver. */
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+ strlcpy(bi->modalias, "mmc_spi", sizeof(bi->modalias));
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+
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+ bi->max_speed_hz = pdata->max_bus_speed;
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+ bi->bus_num = master->bus_num;
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+ bi->mode = pdata->mode;
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+
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+ return 0;
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+}
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+
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+static int gpiommc_probe(struct platform_device *pdev)
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+{
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+ struct gpiommc_platform_data *mmc_pdata = pdev->dev.platform_data;
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+ struct spi_gpio_platform_data spi_pdata;
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+ struct gpiommc_device *d;
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+ int err;
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+
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+ err = -ENXIO;
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+ if (!mmc_pdata)
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+ goto error;
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+
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+ /* Allocate the GPIO-MMC device */
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+ err = -ENOMEM;
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+ d = kzalloc(sizeof(*d), GFP_KERNEL);
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+ if (!d)
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+ goto error;
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+ d->pdev = pdev;
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+
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+ /* Create the SPI-GPIO device */
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+ d->spi_pdev = platform_device_alloc(SPI_GPIO_PLATDEV_NAME,
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+ spi_gpio_next_id());
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+ if (!d->spi_pdev)
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+ goto err_free_d;
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+
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+ memset(&spi_pdata, 0, sizeof(spi_pdata));
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+ spi_pdata.pin_clk = mmc_pdata->pins.gpio_clk;
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+ spi_pdata.pin_miso = mmc_pdata->pins.gpio_do;
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+ spi_pdata.pin_mosi = mmc_pdata->pins.gpio_di;
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+ spi_pdata.pin_cs = mmc_pdata->pins.gpio_cs;
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+ spi_pdata.cs_activelow = mmc_pdata->pins.cs_activelow;
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+ spi_pdata.no_spi_delay = mmc_pdata->no_spi_delay;
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+ spi_pdata.boardinfo_setup = gpiommc_boardinfo_setup;
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+ spi_pdata.boardinfo_setup_data = d;
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+
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+ err = platform_device_add_data(d->spi_pdev, &spi_pdata,
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+ sizeof(spi_pdata));
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+ if (err)
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+ goto err_free_pdev;
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+ err = platform_device_add(d->spi_pdev);
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+ if (err)
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+ goto err_free_pdata;
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+ platform_set_drvdata(pdev, d);
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+
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+ printk(KERN_INFO PFX "MMC-Card \"%s\" "
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+ "attached to GPIO pins di=%u, do=%u, clk=%u, cs=%u\n",
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+ mmc_pdata->name, mmc_pdata->pins.gpio_di,
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+ mmc_pdata->pins.gpio_do,
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+ mmc_pdata->pins.gpio_clk,
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+ mmc_pdata->pins.gpio_cs);
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+
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+ return 0;
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+
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+err_free_pdata:
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+ kfree(d->spi_pdev->dev.platform_data);
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+ d->spi_pdev->dev.platform_data = NULL;
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+err_free_pdev:
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+ platform_device_put(d->spi_pdev);
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+err_free_d:
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+ kfree(d);
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+error:
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+ return err;
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+}
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+
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+static int gpiommc_remove(struct platform_device *pdev)
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+{
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+ struct gpiommc_device *d = platform_get_drvdata(pdev);
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+ struct gpiommc_platform_data *pdata = d->pdev->dev.platform_data;
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+
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+ platform_device_unregister(d->spi_pdev);
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+ printk(KERN_INFO PFX "GPIO based MMC-Card \"%s\" removed\n", pdata->name);
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+ platform_device_put(d->spi_pdev);
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+
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+ return 0;
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+}
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+
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+/* Wrapper for the platform data with context data for the sysfs interface. */
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+struct gpiommc_sysfs_platform_data {
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+ struct gpiommc_platform_data p; /* Keep as first element */
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+
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+ /* The platform device that we allocated. */
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+ struct platform_device *pdev;
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+ /* gpiommc_sysfs_list */
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+ struct list_head list;
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+};
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+
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+static LIST_HEAD(gpiommc_sysfs_list);
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+static DEFINE_MUTEX(gpiommc_sysfs_mutex);
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+
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+static struct gpiommc_sysfs_platform_data *gpiommc_sysfs_find_dev(const char *name)
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+{
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+ struct gpiommc_sysfs_platform_data *pdata;
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+
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+ list_for_each_entry(pdata, &gpiommc_sysfs_list, list) {
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+ if (strcmp(pdata->p.name, name) == 0)
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+ return pdata;
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+ }
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+
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+ return NULL;
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+}
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+
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+static ssize_t gpiommc_add_store(struct device_driver *drv,
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+ const char *buf, size_t count)
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+{
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+ int res, err;
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+ struct gpiommc_sysfs_platform_data pdata_local, *pdata;
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+ struct platform_device *pdev;
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+ unsigned int no_spi_delay = 0, mode = 0, csactivelow = 0;
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+
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+ mutex_lock(&gpiommc_sysfs_mutex);
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+
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+ pdata = &pdata_local;
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+ memset(pdata, 0, sizeof(*pdata));
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+
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+ err = -EINVAL;
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+ res = sscanf(buf, "%" GPIOMMC_MAX_NAMELEN_STR "s %u %u %u %u %u %u %u %u",
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+ pdata->p.name,
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+ &pdata->p.pins.gpio_di,
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+ &pdata->p.pins.gpio_do,
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+ &pdata->p.pins.gpio_clk,
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+ &pdata->p.pins.gpio_cs,
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+ &mode,
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+ &pdata->p.max_bus_speed,
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+ &no_spi_delay,
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+ &csactivelow);
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+ pdata->p.mode = mode;
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+ pdata->p.no_spi_delay = !!no_spi_delay;
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+ pdata->p.pins.cs_activelow = !!csactivelow;
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+ if (res < 9)
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+ pdata->p.pins.cs_activelow = 1; /* Default: CS = activelow */
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+ if (res < 8)
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+ pdata->p.no_spi_delay = 0; /* Default: Delay turned on */
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+ if (res < 7)
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+ pdata->p.max_bus_speed = 5000000; /* Default: 5Mhz */
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+ if (res < 6)
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+ pdata->p.mode = 0; /* Default: SPI mode 0 */
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+ if (res < 5 || res > 9)
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+ goto out; /* First 5 args are mandatory. */
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+
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+ /* Convert mode so that the SPI subsystem does understand it. */
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+ switch (pdata->p.mode) {
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+ case 0:
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+ pdata->p.mode = SPI_MODE_0;
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+ break;
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+ case 1:
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+ pdata->p.mode = SPI_MODE_1;
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+ break;
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+ case 2:
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+ pdata->p.mode = SPI_MODE_2;
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+ break;
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+ case 3:
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+ pdata->p.mode = SPI_MODE_3;
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+ break;
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+ default:
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+ goto out; /* Invalid mode */
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+ }
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+
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+ err = -EEXIST;
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+ if (gpiommc_sysfs_find_dev(pdata->p.name))
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+ goto out;
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+
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+ err = -ENOMEM;
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+ pdev = platform_device_alloc(GPIOMMC_PLATDEV_NAME, gpiommc_next_id());
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+ if (!pdev)
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+ goto out;
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+
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+ err = platform_device_add_data(pdev, pdata, sizeof(*pdata));
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+ if (err)
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+ goto err_free_pdev;
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+ pdata = pdev->dev.platform_data;
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+
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+ err = platform_device_add(pdev);
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+ if (err)
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+ goto err_free_pdev;
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+
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+ pdata->pdev = pdev;
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+ INIT_LIST_HEAD(&pdata->list);
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+ list_add(&pdata->list, &gpiommc_sysfs_list);
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+
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+ err = 0;
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+out:
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+ mutex_unlock(&gpiommc_sysfs_mutex);
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+
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+ return err ? err : count;
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+
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+err_free_pdev:
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+ platform_device_put(pdev);
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+ goto out;
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+}
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+
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+static ssize_t gpiommc_remove_store(struct device_driver *drv,
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+ const char *buf, size_t count)
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+{
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+ struct gpiommc_sysfs_platform_data *pdata;
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+ int err;
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+
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+ mutex_lock(&gpiommc_sysfs_mutex);
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+
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+ err = -ENODEV;
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+ pdata = gpiommc_sysfs_find_dev(buf);
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+ if (!pdata)
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+ goto out;
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+
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+ list_del(&pdata->list);
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+ platform_device_unregister(pdata->pdev);
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+
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+out:
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+ mutex_unlock(&gpiommc_sysfs_mutex);
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+
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+ return err ? err : count;
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+}
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+
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+static DRIVER_ATTR(add, 0200,
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+ NULL, gpiommc_add_store);
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+static DRIVER_ATTR(remove, 0200,
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+ NULL, gpiommc_remove_store);
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+
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+static struct platform_driver gpiommc_plat_driver = {
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+ .probe = gpiommc_probe,
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+ .remove = gpiommc_remove,
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+ .driver = {
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+ .name = GPIOMMC_PLATDEV_NAME,
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+ .owner = THIS_MODULE,
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+ },
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+};
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+
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+int gpiommc_next_id(void)
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+{
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+ static atomic_t counter = ATOMIC_INIT(-1);
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+
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+ return atomic_inc_return(&counter);
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+}
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+EXPORT_SYMBOL(gpiommc_next_id);
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+
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+static int __init gpiommc_modinit(void)
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+{
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+ int err;
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+
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+ err = platform_driver_register(&gpiommc_plat_driver);
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+ if (err)
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+ return err;
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+ err = driver_create_file(&gpiommc_plat_driver.driver,
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+ &driver_attr_add);
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+ if (err)
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+ goto err_drv_unreg;
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+ err = driver_create_file(&gpiommc_plat_driver.driver,
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+ &driver_attr_remove);
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+ if (err)
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+ goto err_remove_add;
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+
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+ return 0;
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+
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+err_remove_add:
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+ driver_remove_file(&gpiommc_plat_driver.driver,
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+ &driver_attr_add);
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+err_drv_unreg:
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+ platform_driver_unregister(&gpiommc_plat_driver);
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+ return err;
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+}
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+module_init(gpiommc_modinit);
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+
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+static void __exit gpiommc_modexit(void)
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+{
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+ struct gpiommc_sysfs_platform_data *pdata, *pdata_tmp;
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+
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+ driver_remove_file(&gpiommc_plat_driver.driver,
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+ &driver_attr_remove);
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+ driver_remove_file(&gpiommc_plat_driver.driver,
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+ &driver_attr_add);
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+
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+ mutex_lock(&gpiommc_sysfs_mutex);
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+ list_for_each_entry_safe(pdata, pdata_tmp, &gpiommc_sysfs_list, list) {
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+ list_del(&pdata->list);
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+ platform_device_unregister(pdata->pdev);
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+ }
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+ mutex_unlock(&gpiommc_sysfs_mutex);
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+
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+ platform_driver_unregister(&gpiommc_plat_driver);
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+}
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+module_exit(gpiommc_modexit);
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Index: linux-2.6.25.10/drivers/mmc/host/Kconfig
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===================================================================
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--- linux-2.6.25.10.orig/drivers/mmc/host/Kconfig 2008-07-18 22:30:36.000000000 +0200
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+++ linux-2.6.25.10/drivers/mmc/host/Kconfig 2008-07-18 22:31:00.000000000 +0200
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@@ -130,3 +130,23 @@ config MMC_SPI
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If unsure, or if your system has no SPI master driver, say N.
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+config GPIOMMC
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+ tristate "MMC/SD over GPIO-based SPI"
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+ depends on MMC && MMC_SPI && SPI_GPIO
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+ help
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+ This driver hooks up the mmc_spi and spi_gpio modules so that
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+ MMC/SD cards can be used on a GPIO based bus by bitbanging
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+ the SPI protocol in software.
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+
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+ This driver provides a sysfs interface to dynamically create
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+ and destroy GPIO-based MMC/SD card interfaces. It also provides
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+ a platform device interface API.
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+ See Documentation/gpiommc.txt for details.
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+
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+ The module will be called gpiommc.
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+
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+ If unsure, say N.
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+
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+config MMC_S3C
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+ tristate "Samsung S3C SD/MMC Card Interface support"
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+ depends on ARCH_S3C2410 && MMC
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Index: linux-2.6.25.10/drivers/mmc/host/Makefile
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===================================================================
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--- linux-2.6.25.10.orig/drivers/mmc/host/Makefile 2008-07-18 22:30:36.000000000 +0200
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+++ linux-2.6.25.10/drivers/mmc/host/Makefile 2008-07-18 22:31:20.000000000 +0200
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@@ -18,3 +18,4 @@ obj-$(CONFIG_MMC_AT91) += at91_mci.o
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obj-$(CONFIG_MMC_TIFM_SD) += tifm_sd.o
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obj-$(CONFIG_MMC_SPI) += mmc_spi.o
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+obj-$(CONFIG_GPIOMMC) += gpiommc.o
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Index: linux-2.6.25.10/include/linux/mmc/gpiommc.h
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===================================================================
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--- /dev/null 1970-01-01 00:00:00.000000000 +0000
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+++ linux-2.6.25.10/include/linux/mmc/gpiommc.h 2008-07-18 22:31:00.000000000 +0200
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@@ -0,0 +1,62 @@
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+/*
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+ * Device driver for MMC/SD cards driven over a GPIO bus.
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+ *
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+ * Copyright (c) 2008 Michael Buesch
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+ *
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+ * Licensed under the GNU/GPL version 2.
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+ */
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+#ifndef LINUX_GPIOMMC_H_
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+#define LINUX_GPIOMMC_H_
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+
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+#include <linux/types.h>
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+
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+
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+#define GPIOMMC_MAX_NAMELEN 15
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+
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+/** struct gpiommc_pins - Hardware pin assignments
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+ * @gpio_di: The GPIO number of the DATA IN pin
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+ * @gpio_do: The GPIO number of the DATA OUT pin
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+ * @gpio_clk: The GPIO number of the CLOCK pin
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+ * @gpio_cs: The GPIO number of the CHIPSELECT pin
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+ * @cs_activelow: If true, the chip is considered selected if @gpio_cs is low.
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+ */
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+struct gpiommc_pins {
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+ unsigned int gpio_di;
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+ unsigned int gpio_do;
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+ unsigned int gpio_clk;
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+ unsigned int gpio_cs;
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+ bool cs_activelow;
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+};
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+
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+/** struct gpiommc_platform_data - Platform data for a MMC-over-SPI-GPIO device.
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+ * @name: The unique name string of the device.
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+ * @pins: The hardware pin assignments.
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+ * @mode: The hardware mode. This is either SPI_MODE_0,
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+ * SPI_MODE_1, SPI_MODE_2 or SPI_MODE_3. See the SPI documentation.
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+ * @no_spi_delay: Do not use delays in the lowlevel SPI bitbanging code.
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+ * This is not standards compliant, but may be required for some
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+ * embedded machines to gain reasonable speed.
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+ * @max_bus_speed: The maximum speed of the SPI bus, in Hertz.
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+ */
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+struct gpiommc_platform_data {
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+ char name[GPIOMMC_MAX_NAMELEN + 1];
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+ struct gpiommc_pins pins;
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+ u8 mode;
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+ bool no_spi_delay;
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+ unsigned int max_bus_speed;
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+};
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+
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+/** GPIOMMC_PLATDEV_NAME - The platform device name string.
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+ * The name string that has to be used for platform_device_alloc
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+ * when allocating a gpiommc device.
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+ */
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+#define GPIOMMC_PLATDEV_NAME "gpiommc"
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+
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+/** gpiommc_next_id - Get another platform device ID number.
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+ * This returns the next platform device ID number that has to be used
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+ * for platform_device_alloc. The ID is opaque and should not be used for
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+ * anything else.
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+ */
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+int gpiommc_next_id(void);
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+
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+#endif /* LINUX_GPIOMMC_H_ */
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Index: linux-2.6.25.10/Documentation/gpiommc.txt
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===================================================================
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--- /dev/null 1970-01-01 00:00:00.000000000 +0000
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+++ linux-2.6.25.10/Documentation/gpiommc.txt 2008-07-18 22:31:00.000000000 +0200
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@@ -0,0 +1,96 @@
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+GPIOMMC - Driver for an MMC/SD card on a bitbanging GPIO SPI bus
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+================================================================
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+
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+The gpiommc module hooks up the mmc_spi and spi_gpio modules for running an
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+MMC or SD card on GPIO pins.
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+
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+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
|