OMAP2+: GPIO: device registration

Use omap_device_build() API to do platform_device_register of
GPIO devices. For OMAP2+ chips, the device specific data defined
in the centralized hwmod database will be used.

gpio_init needs to be done before machine_init functions access
gpio APIs. Hence gpio_init is made as a postcore_initcall.

Signed-off-by: Charulatha V <charu@ti.com>
Acked-by: Benoit Cousson <b-cousson@ti.com>
Reviewed-by: Basak, Partha <p-basak2@ti.com>
Acked-by: Kevin Hilman <khilman@deeprootsystems.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

1 files changed, 104 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/gpio.c b/arch/arm/mach-omap2/gpio.c
new file mode 100644
index 000000000000..413de18c1d2b
--- /dev/null
+++ b/arch/arm/mach-omap2/gpio.c
@@ -0,0 +1,104 @@
+/*
+ * OMAP2+ specific gpio initialization
+ *
+ * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
+ *
+ * Author:
+ *      Charulatha V <charu@ti.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 version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/gpio.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+
+#include <plat/omap_hwmod.h>
+#include <plat/omap_device.h>
+
+static struct omap_device_pm_latency omap_gpio_latency[] = {
+        [0] = {
+                .deactivate_func = omap_device_idle_hwmods,
+                .activate_func   = omap_device_enable_hwmods,
+                .flags           = OMAP_DEVICE_LATENCY_AUTO_ADJUST,
+        },
+};
+
+static int omap2_gpio_dev_init(struct omap_hwmod *oh, void *unused)
+{
+        struct omap_device *od;
+        struct omap_gpio_platform_data *pdata;
+        struct omap_gpio_dev_attr *dev_attr;
+        char *name = "omap_gpio";
+        int id;
+
+        /*
+         * extract the device id from name field available in the
+         * hwmod database and use the same for constructing ids for
+         * gpio devices.
+         * CAUTION: Make sure the name in the hwmod database does
+         * not change. If changed, make corresponding change here
+         * or make use of static variable mechanism to handle this.
+         */
+        sscanf(oh->name, "gpio%d", &id);
+
+        pdata = kzalloc(sizeof(struct omap_gpio_platform_data), GFP_KERNEL);
+        if (!pdata) {
+                pr_err("gpio%d: Memory allocation failed\n", id);
+                return -ENOMEM;
+        }
+
+        dev_attr = (struct omap_gpio_dev_attr *)oh->dev_attr;
+        pdata->bank_width = dev_attr->bank_width;
+        pdata->dbck_flag = dev_attr->dbck_flag;
+        pdata->virtual_irq_start = IH_GPIO_BASE + 32 * (id - 1);
+
+        switch (oh->class->rev) {
+        case 0:
+        case 1:
+                pdata->bank_type = METHOD_GPIO_24XX;
+                break;
+        case 2:
+                pdata->bank_type = METHOD_GPIO_44XX;
+                break;
+        default:
+                WARN(1, "Invalid gpio bank_type\n");
+                kfree(pdata);
+                return -EINVAL;
+        }
+
+        od = omap_device_build(name, id - 1, oh, pdata,
+                                sizeof(*pdata), omap_gpio_latency,
+                                ARRAY_SIZE(omap_gpio_latency),
+                                false);
+        kfree(pdata);
+
+        if (IS_ERR(od)) {
+                WARN(1, "Cant build omap_device for %s:%s.\n",
+                                        name, oh->name);
+                return PTR_ERR(od);
+        }
+
+        gpio_bank_count++;
+        return 0;
+}
+
+/*
+ * gpio_init needs to be done before
+ * machine_init functions access gpio APIs.
+ * Hence gpio_init is a postcore_initcall.
+ */
+static int __init omap2_gpio_init(void)
+{
+        return omap_hwmod_for_each_by_class("gpio", omap2_gpio_dev_init,
+                                                NULL);
+}
+postcore_initcall(omap2_gpio_init);