This patch adds support for handling GPIO as a HWMOD FW adapted
platform device for OMAP2PLUS chips.
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@xxxxxx>
Signed-off-by: Basak, Partha <p-basak2@xxxxxx>
---
arch/arm/mach-omap2/gpio.c | 120 ++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 120 insertions(+), 0 deletions(-)
create mode 100644 arch/arm/mach-omap2/gpio.c
diff --git a/arch/arm/mach-omap2/gpio.c b/arch/arm/mach-omap2/gpio.c
new file mode 100644
index 0000000..30aeef9
--- /dev/null
+++ b/arch/arm/mach-omap2/gpio.c
@@ -0,0 +1,120 @@
+/*
+ * gpio.c - OMAP2PLUS-specific gpio code
+ *
+ * Copyright (C) 2010 Texas Instruments, Inc.
+ *
+ * Author:
+ * Charulatha V <charu@xxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#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>
+
+/*
+ * For GPIO, it is a must to relinquish clocks in the Idle-path
+ * as it is possible to have a GPIO bank requested and still
+ * allow PER domain to go to OFF. In the idle path (interrupt
+ * disabled context), omap_device APIs cannot be used as they
+ * are not mutex-free functions. Hence the below wrappers are
+ * required to handle interrupts disabled context and interrupts
+ * enabled context.
+ */
+static int gpio_enable_hwmod(struct omap_device *od)
+{
+ struct omap_hwmod *oh = *od->hwmods;
+
+ if (irqs_disabled())
+ _omap_hwmod_enable(oh);
+ else
+ omap_device_enable_hwmods(od);
+ return 0;
+}
+
+static int gpio_idle_hwmod(struct omap_device *od)
+{
+ struct omap_hwmod *oh = *od->hwmods;
+
+ if (irqs_disabled())
+ _omap_hwmod_idle(oh);
+ else
+ omap_device_idle_hwmods(od);
+ return 0;
+}
+
+static struct omap_device_pm_latency omap_gpio_latency[] = {
+ [0] = {
+ .deactivate_func = gpio_idle_hwmod,
+ .activate_func = gpio_enable_hwmod,
+ .flags = OMAP_DEVICE_LATENCY_AUTO_ADJUST,
+ },
+};
+
+static int omap2_init_gpio(struct omap_hwmod *oh, void *user)
+{
+ struct omap_device *od;
+ struct omap_gpio_platform_data *pdata;
+ char *name = "omap-gpio";
+ static int id;
+ struct omap_gpio_dev_attr *gpio_dev_data;
+
+ if (!oh) {
+ pr_err("Could not look up omap gpio %d\n", id + 1);
+ return -EINVAL;
+ }
+
+ pdata = kzalloc(sizeof(struct omap_gpio_platform_data),
+ GFP_KERNEL);
+ if (!pdata) {
+ pr_err("Memory allocation failed gpio%d\n", id + 1);
+ return -ENOMEM;
+ }
+
+ gpio_dev_data = (struct omap_gpio_dev_attr *)oh->dev_attr;
+
+ pdata->gpio_attr = gpio_dev_data;
+ pdata->virtual_irq_start = IH_GPIO_BASE + 32 * id;
+ 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");
+ break;
+ }
+ gpio_bank_count++;
+
+ od = omap_device_build(name, id, oh, pdata,
+ sizeof(*pdata), omap_gpio_latency,
+ ARRAY_SIZE(omap_gpio_latency),
+ false);
+ WARN(IS_ERR(od), "Cant build omap_device for %s:%s.\n",
+ name, oh->name);
+
+ id++;
+ 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_init_gpio,
+ NULL);
+}
+postcore_initcall(omap2_gpio_init);
--
1.6.3.3
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