Added missing tegra files.HEADmaster

2 files changed, 344 insertions, 0 deletions

diff --git a/drivers/of/gpio.c b/drivers/of/gpio.c
new file mode 100644
index 00000000000..ef0105fa52b
--- /dev/null
+++ b/drivers/of/gpio.c
@@ -0,0 +1,246 @@
+/*
+ * OF helpers for the GPIO API
+ *
+ * Copyright (c) 2007-2008  MontaVista Software, Inc.
+ *
+ * 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/device.h>
+#include <linux/errno.h>
+#include <linux/module.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_gpio.h>
+#include <linux/slab.h>
+
+/**
+ * of_get_named_gpio_flags() - Get a GPIO number and flags to use with GPIO API
+ * @np:         device node to get GPIO from
+ * @propname:   property name containing gpio specifier(s)
+ * @index:      index of the GPIO
+ * @flags:      a flags pointer to fill in
+ *
+ * Returns GPIO number to use with Linux generic GPIO API, or one of the errno
+ * value on the error condition. If @flags is not NULL the function also fills
+ * in flags for the GPIO.
+ */
+int of_get_named_gpio_flags(struct device_node *np, const char *propname,
+                           int index, enum of_gpio_flags *flags)
+{
+        int ret;
+        struct device_node *gpio_np;
+        struct gpio_chip *gc;
+        int size;
+        const void *gpio_spec;
+        const __be32 *gpio_cells;
+
+        ret = of_parse_phandles_with_args(np, propname, "#gpio-cells", index,
+                                          &gpio_np, &gpio_spec);
+        if (ret) {
+                pr_debug("%s: can't parse gpios property\n", __func__);
+                goto err0;
+        }
+
+        gc = of_node_to_gpiochip(gpio_np);
+        if (!gc) {
+                pr_debug("%s: gpio controller %s isn't registered\n",
+                         np->full_name, gpio_np->full_name);
+                ret = -ENODEV;
+                goto err1;
+        }
+
+        gpio_cells = of_get_property(gpio_np, "#gpio-cells", &size);
+        if (!gpio_cells || size != sizeof(*gpio_cells) ||
+                        be32_to_cpup(gpio_cells) != gc->of_gpio_n_cells) {
+                pr_debug("%s: wrong #gpio-cells for %s\n",
+                         np->full_name, gpio_np->full_name);
+                ret = -EINVAL;
+                goto err1;
+        }
+
+        /* .xlate might decide to not fill in the flags, so clear it. */
+        if (flags)
+                *flags = 0;
+
+        ret = gc->of_xlate(gc, np, gpio_spec, flags);
+        if (ret < 0)
+                goto err1;
+
+        ret += gc->base;
+err1:
+        of_node_put(gpio_np);
+err0:
+        pr_debug("%s exited with status %d\n", __func__, ret);
+        return ret;
+}
+EXPORT_SYMBOL(of_get_named_gpio_flags);
+
+/**
+ * of_gpio_count - Count GPIOs for a device
+ * @np:         device node to count GPIOs for
+ *
+ * The function returns the count of GPIOs specified for a node.
+ *
+ * Note that the empty GPIO specifiers counts too. For example,
+ *
+ * gpios = <0
+ *          &pio1 1 2
+ *          0
+ *          &pio2 3 4>;
+ *
+ * defines four GPIOs (so this function will return 4), two of which
+ * are not specified.
+ */
+unsigned int of_gpio_count(struct device_node *np)
+{
+        unsigned int cnt = 0;
+
+        do {
+                int ret;
+
+                ret = of_parse_phandles_with_args(np, "gpios", "#gpio-cells",
+                                                  cnt, NULL, NULL);
+                /* A hole in the gpios = <> counts anyway. */
+                if (ret < 0 && ret != -EEXIST)
+                        break;
+        } while (++cnt);
+
+        return cnt;
+}
+EXPORT_SYMBOL(of_gpio_count);
+
+/**
+ * of_gpio_simple_xlate - translate gpio_spec to the GPIO number and flags
+ * @gc:         pointer to the gpio_chip structure
+ * @np:         device node of the GPIO chip
+ * @gpio_spec:  gpio specifier as found in the device tree
+ * @flags:      a flags pointer to fill in
+ *
+ * This is simple translation function, suitable for the most 1:1 mapped
+ * gpio chips. This function performs only one sanity check: whether gpio
+ * is less than ngpios (that is specified in the gpio_chip).
+ */
+int of_gpio_simple_xlate(struct gpio_chip *gc, struct device_node *np,
+                         const void *gpio_spec, u32 *flags)
+{
+        const __be32 *gpio = gpio_spec;
+        const u32 n = be32_to_cpup(gpio);
+
+        /*
+         * We're discouraging gpio_cells < 2, since that way you'll have to
+         * write your own xlate function (that will have to retrive the GPIO
+         * number and the flags from a single gpio cell -- this is possible,
+         * but not recommended).
+         */
+        if (gc->of_gpio_n_cells < 2) {
+                WARN_ON(1);
+                return -EINVAL;
+        }
+
+        if (n > gc->ngpio)
+                return -EINVAL;
+
+        if (flags)
+                *flags = be32_to_cpu(gpio[1]);
+
+        return n;
+}
+EXPORT_SYMBOL(of_gpio_simple_xlate);
+
+/**
+ * of_mm_gpiochip_add - Add memory mapped GPIO chip (bank)
+ * @np:         device node of the GPIO chip
+ * @mm_gc:      pointer to the of_mm_gpio_chip allocated structure
+ *
+ * To use this function you should allocate and fill mm_gc with:
+ *
+ * 1) In the gpio_chip structure:
+ *    - all the callbacks
+ *    - of_gpio_n_cells
+ *    - of_xlate callback (optional)
+ *
+ * 3) In the of_mm_gpio_chip structure:
+ *    - save_regs callback (optional)
+ *
+ * If succeeded, this function will map bank's memory and will
+ * do all necessary work for you. Then you'll able to use .regs
+ * to manage GPIOs from the callbacks.
+ */
+int of_mm_gpiochip_add(struct device_node *np,
+                       struct of_mm_gpio_chip *mm_gc)
+{
+        int ret = -ENOMEM;
+        struct gpio_chip *gc = &mm_gc->gc;
+
+        gc->label = kstrdup(np->full_name, GFP_KERNEL);
+        if (!gc->label)
+                goto err0;
+
+        mm_gc->regs = of_iomap(np, 0);
+        if (!mm_gc->regs)
+                goto err1;
+
+        gc->base = -1;
+
+        if (mm_gc->save_regs)
+                mm_gc->save_regs(mm_gc);
+
+        mm_gc->gc.of_node = np;
+
+        ret = gpiochip_add(gc);
+        if (ret)
+                goto err2;
+
+        pr_debug("%s: registered as generic GPIO chip, base is %d\n",
+                 np->full_name, gc->base);
+        return 0;
+err2:
+        iounmap(mm_gc->regs);
+err1:
+        kfree(gc->label);
+err0:
+        pr_err("%s: GPIO chip registration failed with status %d\n",
+               np->full_name, ret);
+        return ret;
+}
+EXPORT_SYMBOL(of_mm_gpiochip_add);
+
+void of_gpiochip_add(struct gpio_chip *chip)
+{
+        if ((!chip->of_node) && (chip->dev))
+                chip->of_node = chip->dev->of_node;
+
+        if (!chip->of_node)
+                return;
+
+        if (!chip->of_xlate) {
+                chip->of_gpio_n_cells = 2;
+                chip->of_xlate = of_gpio_simple_xlate;
+        }
+
+        of_node_get(chip->of_node);
+}
+
+void of_gpiochip_remove(struct gpio_chip *chip)
+{
+        if (chip->of_node)
+                of_node_put(chip->of_node);
+}
+
+/* Private function for resolving node pointer to gpio_chip */
+static int of_gpiochip_is_match(struct gpio_chip *chip, void *data)
+{
+        return chip->of_node == data;
+}
+
+struct gpio_chip *of_node_to_gpiochip(struct device_node *np)
+{
+        return gpiochip_find(np, of_gpiochip_is_match);
+}
diff --git a/drivers/of/of_spi.c b/drivers/of/of_spi.c
new file mode 100644
index 00000000000..1dbce58a58b
--- /dev/null
+++ b/drivers/of/of_spi.c
@@ -0,0 +1,98 @@
+/*
+ * SPI OF support routines
+ * Copyright (C) 2008 Secret Lab Technologies Ltd.
+ *
+ * Support routines for deriving SPI device attachments from the device
+ * tree.
+ */
+
+#include <linux/of.h>
+#include <linux/device.h>
+#include <linux/spi/spi.h>
+#include <linux/of_irq.h>
+#include <linux/of_spi.h>
+
+/**
+ * of_register_spi_devices - Register child devices onto the SPI bus
+ * @master:     Pointer to spi_master device
+ *
+ * Registers an spi_device for each child node of master node which has a 'reg'
+ * property.
+ */
+void of_register_spi_devices(struct spi_master *master)
+{
+        struct spi_device *spi;
+        struct device_node *nc;
+        const __be32 *prop;
+        int rc;
+        int len;
+
+        if (!master->dev.of_node)
+                return;
+
+        for_each_child_of_node(master->dev.of_node, nc) {
+                /* Alloc an spi_device */
+                spi = spi_alloc_device(master);
+                if (!spi) {
+                        dev_err(&master->dev, "spi_device alloc error for %s\n",
+                                nc->full_name);
+                        spi_dev_put(spi);
+                        continue;
+                }
+
+                /* Select device driver */
+                if (of_modalias_node(nc, spi->modalias,
+                                     sizeof(spi->modalias)) < 0) {
+                        dev_err(&master->dev, "cannot find modalias for %s\n",
+                                nc->full_name);
+                        spi_dev_put(spi);
+                        continue;
+                }
+
+                /* Device address */
+                prop = of_get_property(nc, "reg", &len);
+                if (!prop || len < sizeof(*prop)) {
+                        dev_err(&master->dev, "%s has no 'reg' property\n",
+                                nc->full_name);
+                        spi_dev_put(spi);
+                        continue;
+                }
+                spi->chip_select = be32_to_cpup(prop);
+
+                /* Mode (clock phase/polarity/etc.) */
+                if (of_find_property(nc, "spi-cpha", NULL))
+                        spi->mode |= SPI_CPHA;
+                if (of_find_property(nc, "spi-cpol", NULL))
+                        spi->mode |= SPI_CPOL;
+                if (of_find_property(nc, "spi-cs-high", NULL))
+                        spi->mode |= SPI_CS_HIGH;
+
+                /* Device speed */
+                prop = of_get_property(nc, "spi-max-frequency", &len);
+                if (!prop || len < sizeof(*prop)) {
+                        dev_err(&master->dev, "%s has no 'spi-max-frequency' property\n",
+                                nc->full_name);
+                        spi_dev_put(spi);
+                        continue;
+                }
+                spi->max_speed_hz = be32_to_cpup(prop);
+
+                /* IRQ */
+                spi->irq = irq_of_parse_and_map(nc, 0);
+
+                /* Store a pointer to the node in the device structure */
+                of_node_get(nc);
+                spi->dev.of_node = nc;
+
+                /* Register the new device */
+                request_module(spi->modalias);
+                rc = spi_add_device(spi);
+                if (rc) {
+                        dev_err(&master->dev, "spi_device register error %s\n",
+                                nc->full_name);
+                        spi_dev_put(spi);
+                }
+
+        }
+}
+EXPORT_SYMBOL(of_register_spi_devices);