|
@@ -0,0 +1,149 @@
|
|
|
+/*
|
|
|
+ * OpenFirmware bindings for the MMC-over-SPI driver
|
|
|
+ *
|
|
|
+ * Copyright (c) MontaVista Software, Inc. 2008.
|
|
|
+ *
|
|
|
+ * Author: Anton Vorontsov <avorontsov@ru.mvista.com>
|
|
|
+ *
|
|
|
+ * This program is free software; you can redistribute it and/or modify it
|
|
|
+ * under the terms of the GNU General Public License as published by the
|
|
|
+ * Free Software Foundation; either version 2 of the License, or (at your
|
|
|
+ * option) any later version.
|
|
|
+ */
|
|
|
+
|
|
|
+#include <linux/kernel.h>
|
|
|
+#include <linux/module.h>
|
|
|
+#include <linux/device.h>
|
|
|
+#include <linux/gpio.h>
|
|
|
+#include <linux/of.h>
|
|
|
+#include <linux/of_gpio.h>
|
|
|
+#include <linux/spi/spi.h>
|
|
|
+#include <linux/spi/mmc_spi.h>
|
|
|
+#include <linux/mmc/core.h>
|
|
|
+#include <linux/mmc/host.h>
|
|
|
+
|
|
|
+enum {
|
|
|
+ CD_GPIO = 0,
|
|
|
+ WP_GPIO,
|
|
|
+ NUM_GPIOS,
|
|
|
+};
|
|
|
+
|
|
|
+struct of_mmc_spi {
|
|
|
+ int gpios[NUM_GPIOS];
|
|
|
+ bool alow_gpios[NUM_GPIOS];
|
|
|
+ struct mmc_spi_platform_data pdata;
|
|
|
+};
|
|
|
+
|
|
|
+static struct of_mmc_spi *to_of_mmc_spi(struct device *dev)
|
|
|
+{
|
|
|
+ return container_of(dev->platform_data, struct of_mmc_spi, pdata);
|
|
|
+}
|
|
|
+
|
|
|
+static int of_mmc_spi_read_gpio(struct device *dev, int gpio_num)
|
|
|
+{
|
|
|
+ struct of_mmc_spi *oms = to_of_mmc_spi(dev);
|
|
|
+ bool active_low = oms->alow_gpios[gpio_num];
|
|
|
+ bool value = gpio_get_value(oms->gpios[gpio_num]);
|
|
|
+
|
|
|
+ return active_low ^ value;
|
|
|
+}
|
|
|
+
|
|
|
+static int of_mmc_spi_get_cd(struct device *dev)
|
|
|
+{
|
|
|
+ return of_mmc_spi_read_gpio(dev, CD_GPIO);
|
|
|
+}
|
|
|
+
|
|
|
+static int of_mmc_spi_get_ro(struct device *dev)
|
|
|
+{
|
|
|
+ return of_mmc_spi_read_gpio(dev, WP_GPIO);
|
|
|
+}
|
|
|
+
|
|
|
+struct mmc_spi_platform_data *mmc_spi_get_pdata(struct spi_device *spi)
|
|
|
+{
|
|
|
+ struct device *dev = &spi->dev;
|
|
|
+ struct device_node *np = dev_archdata_get_node(&dev->archdata);
|
|
|
+ struct of_mmc_spi *oms;
|
|
|
+ const u32 *voltage_ranges;
|
|
|
+ int num_ranges;
|
|
|
+ int i;
|
|
|
+ int ret = -EINVAL;
|
|
|
+
|
|
|
+ if (dev->platform_data || !np)
|
|
|
+ return dev->platform_data;
|
|
|
+
|
|
|
+ oms = kzalloc(sizeof(*oms), GFP_KERNEL);
|
|
|
+ if (!oms)
|
|
|
+ return NULL;
|
|
|
+
|
|
|
+ voltage_ranges = of_get_property(np, "voltage-ranges", &num_ranges);
|
|
|
+ num_ranges = num_ranges / sizeof(*voltage_ranges) / 2;
|
|
|
+ if (!voltage_ranges || !num_ranges) {
|
|
|
+ dev_err(dev, "OF: voltage-ranges unspecified\n");
|
|
|
+ goto err_ocr;
|
|
|
+ }
|
|
|
+
|
|
|
+ for (i = 0; i < num_ranges; i++) {
|
|
|
+ const int j = i * 2;
|
|
|
+ u32 mask;
|
|
|
+
|
|
|
+ mask = mmc_vddrange_to_ocrmask(voltage_ranges[j],
|
|
|
+ voltage_ranges[j + 1]);
|
|
|
+ if (!mask) {
|
|
|
+ ret = -EINVAL;
|
|
|
+ dev_err(dev, "OF: voltage-range #%d is invalid\n", i);
|
|
|
+ goto err_ocr;
|
|
|
+ }
|
|
|
+ oms->pdata.ocr_mask |= mask;
|
|
|
+ }
|
|
|
+
|
|
|
+ for (i = 0; i < ARRAY_SIZE(oms->gpios); i++) {
|
|
|
+ enum of_gpio_flags gpio_flags;
|
|
|
+
|
|
|
+ oms->gpios[i] = of_get_gpio_flags(np, i, &gpio_flags);
|
|
|
+ if (!gpio_is_valid(oms->gpios[i]))
|
|
|
+ continue;
|
|
|
+
|
|
|
+ ret = gpio_request(oms->gpios[i], dev->bus_id);
|
|
|
+ if (ret < 0) {
|
|
|
+ oms->gpios[i] = -EINVAL;
|
|
|
+ continue;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (gpio_flags & OF_GPIO_ACTIVE_LOW)
|
|
|
+ oms->alow_gpios[i] = true;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (gpio_is_valid(oms->gpios[CD_GPIO]))
|
|
|
+ oms->pdata.get_cd = of_mmc_spi_get_cd;
|
|
|
+ if (gpio_is_valid(oms->gpios[WP_GPIO]))
|
|
|
+ oms->pdata.get_ro = of_mmc_spi_get_ro;
|
|
|
+
|
|
|
+ /* We don't support interrupts yet, let's poll. */
|
|
|
+ oms->pdata.caps |= MMC_CAP_NEEDS_POLL;
|
|
|
+
|
|
|
+ dev->platform_data = &oms->pdata;
|
|
|
+ return dev->platform_data;
|
|
|
+err_ocr:
|
|
|
+ kfree(oms);
|
|
|
+ return NULL;
|
|
|
+}
|
|
|
+EXPORT_SYMBOL(mmc_spi_get_pdata);
|
|
|
+
|
|
|
+void mmc_spi_put_pdata(struct spi_device *spi)
|
|
|
+{
|
|
|
+ struct device *dev = &spi->dev;
|
|
|
+ struct device_node *np = dev_archdata_get_node(&dev->archdata);
|
|
|
+ struct of_mmc_spi *oms = to_of_mmc_spi(dev);
|
|
|
+ int i;
|
|
|
+
|
|
|
+ if (!dev->platform_data || !np)
|
|
|
+ return;
|
|
|
+
|
|
|
+ for (i = 0; i < ARRAY_SIZE(oms->gpios); i++) {
|
|
|
+ if (gpio_is_valid(oms->gpios[i]))
|
|
|
+ gpio_free(oms->gpios[i]);
|
|
|
+ }
|
|
|
+ kfree(oms);
|
|
|
+ dev->platform_data = NULL;
|
|
|
+}
|
|
|
+EXPORT_SYMBOL(mmc_spi_put_pdata);
|