[POWERPC] OF helpers for the GPIO API

This implements various helpers to support OF bindings for the GPIO
LIB API.

Previously this was PowerPC specific, but it seems this code isn't
arch-dependent anyhow, so let's place it into of/.

SPARC will not see this addition yet, real hardware seem to not use
GPIOs at all. But this might change:

   http://www.leox.org/docs/faq_MLleon.html

"16-bit I/O port" sounds promising. :-)

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 242 insertions, 0 deletions

diff --git a/drivers/of/gpio.c b/drivers/of/gpio.c
new file mode 100644
index 000000000000..000681e98f2c
--- /dev/null
+++ b/drivers/of/gpio.c
@@ -0,0 +1,242 @@
+/*
+ * 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/kernel.h>
+#include <linux/errno.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <asm/prom.h>
+
+/**
+ * of_get_gpio - Get a GPIO number from the device tree to use with GPIO API
+ * @np:         device node to get GPIO from
+ * @index:      index of the GPIO
+ *
+ * Returns GPIO number to use with Linux generic GPIO API, or one of the errno
+ * value on the error condition.
+ */
+int of_get_gpio(struct device_node *np, int index)
+{
+        int ret = -EINVAL;
+        struct device_node *gc;
+        struct of_gpio_chip *of_gc = NULL;
+        int size;
+        const u32 *gpios;
+        u32 nr_cells;
+        int i;
+        const void *gpio_spec;
+        const u32 *gpio_cells;
+        int gpio_index = 0;
+
+        gpios = of_get_property(np, "gpios", &size);
+        if (!gpios) {
+                ret = -ENOENT;
+                goto err0;
+        }
+        nr_cells = size / sizeof(u32);
+
+        for (i = 0; i < nr_cells; gpio_index++) {
+                const phandle *gpio_phandle;
+
+                gpio_phandle = gpios + i;
+                gpio_spec = gpio_phandle + 1;
+
+                /* one cell hole in the gpios = <>; */
+                if (!*gpio_phandle) {
+                        if (gpio_index == index)
+                                return -ENOENT;
+                        i++;
+                        continue;
+                }
+
+                gc = of_find_node_by_phandle(*gpio_phandle);
+                if (!gc) {
+                        pr_debug("%s: could not find phandle for gpios\n",
+                                 np->full_name);
+                        goto err0;
+                }
+
+                of_gc = gc->data;
+                if (!of_gc) {
+                        pr_debug("%s: gpio controller %s isn't registered\n",
+                                 np->full_name, gc->full_name);
+                        goto err1;
+                }
+
+                gpio_cells = of_get_property(gc, "#gpio-cells", &size);
+                if (!gpio_cells || size != sizeof(*gpio_cells) ||
+                                *gpio_cells != of_gc->gpio_cells) {
+                        pr_debug("%s: wrong #gpio-cells for %s\n",
+                                 np->full_name, gc->full_name);
+                        goto err1;
+                }
+
+                /* Next phandle is at phandle cells + #gpio-cells */
+                i += sizeof(*gpio_phandle) / sizeof(u32) + *gpio_cells;
+                if (i >= nr_cells + 1) {
+                        pr_debug("%s: insufficient gpio-spec length\n",
+                                 np->full_name);
+                        goto err1;
+                }
+
+                if (gpio_index == index)
+                        break;
+
+                of_gc = NULL;
+                of_node_put(gc);
+        }
+
+        if (!of_gc) {
+                ret = -ENOENT;
+                goto err0;
+        }
+
+        ret = of_gc->xlate(of_gc, np, gpio_spec);
+        if (ret < 0)
+                goto err1;
+
+        ret += of_gc->gc.base;
+err1:
+        of_node_put(gc);
+err0:
+        pr_debug("%s exited with status %d\n", __func__, ret);
+        return ret;
+}
+EXPORT_SYMBOL(of_get_gpio);
+
+/**
+ * of_gpio_simple_xlate - translate gpio_spec to the GPIO number
+ * @of_gc:      pointer to the of_gpio_chip structure
+ * @np:         device node of the GPIO chip
+ * @gpio_spec:  gpio specifier as found in the device tree
+ *
+ * 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 of_gpio_chip *of_gc, struct device_node *np,
+                         const void *gpio_spec)
+{
+        const u32 *gpio = gpio_spec;
+
+        if (*gpio > of_gc->gc.ngpio)
+                return -EINVAL;
+
+        return *gpio;
+}
+EXPORT_SYMBOL(of_gpio_simple_xlate);
+
+/* Should be sufficient for now, later we'll use dynamic bases. */
+#if defined(CONFIG_PPC32) || defined(CONFIG_SPARC32)
+#define GPIOS_PER_CHIP 32
+#else
+#define GPIOS_PER_CHIP 64
+#endif
+
+static int of_get_gpiochip_base(struct device_node *np)
+{
+        struct device_node *gc = NULL;
+        int gpiochip_base = 0;
+
+        while ((gc = of_find_all_nodes(gc))) {
+                if (!of_get_property(gc, "gpio-controller", NULL))
+                        continue;
+
+                if (gc != np) {
+                        gpiochip_base += GPIOS_PER_CHIP;
+                        continue;
+                }
+
+                of_node_put(gc);
+
+                if (gpiochip_base >= ARCH_NR_GPIOS)
+                        return -ENOSPC;
+
+                return gpiochip_base;
+        }
+
+        return -ENOENT;
+}
+
+/**
+ * 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
+ *
+ * 2) In the of_gpio_chip structure:
+ *    - gpio_cells
+ *    - 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 of_gpio_chip *of_gc = &mm_gc->of_gc;
+        struct gpio_chip *gc = &of_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 = of_get_gpiochip_base(np);
+        if (gc->base < 0) {
+                ret = gc->base;
+                goto err1;
+        }
+
+        if (!of_gc->xlate)
+                of_gc->xlate = of_gpio_simple_xlate;
+
+        if (mm_gc->save_regs)
+                mm_gc->save_regs(mm_gc);
+
+        np->data = of_gc;
+
+        ret = gpiochip_add(gc);
+        if (ret)
+                goto err2;
+
+        /* We don't want to lose the node and its ->data */
+        of_node_get(np);
+
+        pr_debug("%s: registered as generic GPIO chip, base is %d\n",
+                 np->full_name, gc->base);
+        return 0;
+err2:
+        np->data = NULL;
+        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);