This patch adds support for handling GPIO as a HWMOD adapted
platform device for OMAP2PLUS chips.
Signed-off-by: Charulatha V <ch...@ti.com>
---
arch/arm/mach-omap2/gpio.c | 101 ++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 101 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..6424050
--- /dev/null
+++ b/arch/arm/mach-omap2/gpio.c
@@ -0,0 +1,101 @@
+/*
+ * gpio.c - OMAP2PLUS-specific gpio code
+ *
+ * Copyright (C) 2010 Texas Instruments, Inc.
+ *
+ * Author:
+ * Charulatha V <ch...@ti.com>
+ *
+ * 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 <plat/omap_hwmod.h>
+#include <plat/omap_device.h>
+
+static int gpio_bank_count;
+
+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,
+ },
+};
+
+int __init gpio_init(void)
+{
+ int i = 0;
+ static int is_early_device = true;
+
+ do {
+ struct omap_device *od;
+ struct omap_hwmod *oh;
+ int hw_mod_name_len = 16;
+ int l;
+ char oh_name[hw_mod_name_len];
+ struct omap_gpio_platform_data *pdata;
+ char *name = "omap-gpio";
+
+ l = snprintf(oh_name, hw_mod_name_len, "gpio%d_hwmod", i + 1);
+ WARN(l >= hw_mod_name_len,
+ "String buffer overflow in GPIO device setup\n");
+
+ oh = omap_hwmod_lookup(oh_name);
+ if (!oh) {
+ pr_err("Could not look up %s\n", oh_name);
+ i++;
+ continue;
+ }
+
+ pdata = kzalloc(sizeof(struct omap_gpio_platform_data),
+ GFP_KERNEL);
+ if (!pdata) {
+ pr_err("Memory allocation failed gpio%d\n", i + 1);
+ return -ENOMEM;
+ }
+ pdata->base = oh->_rt_va;
+ pdata->irq = oh->mpu_irqs[0].irq;
+ if (cpu_is_omap24xx() || cpu_is_omap34xx())
+ pdata->method = METHOD_GPIO_24XX;
+ if (cpu_is_omap44xx())
+ pdata->method = METHOD_GPIO_44XX;
+ pdata->virtual_irq_start = IH_GPIO_BASE + 32 * i;
+ pdata->device_enable = omap_device_enable;
+ pdata->device_idle = omap_device_idle;
+ pdata->device_shutdown = omap_device_shutdown;
+
+ od = omap_device_build(name, i, oh, pdata,
+ sizeof(*pdata), omap_gpio_latency,
+ ARRAY_SIZE(omap_gpio_latency),
+ is_early_device);
+ WARN(IS_ERR(od), "Cant build omap_device for %s:%s.\n",
+ name, oh->name);
+
+ i++;
+ } while (i < gpio_bank_count);
+ is_early_device = false;
+
+ return 0;
+}
+arch_initcall(gpio_init);
+
+int __init omap2_gpio_init(void)
+{
+ if (cpu_is_omap242x())
+ gpio_bank_count = 4;
+ else if (cpu_is_omap243x())
+ gpio_bank_count = 5;
+ else if (cpu_is_omap34xx() || cpu_is_omap44xx())
+ gpio_bank_count = OMAP34XX_NR_GPIOS;
+
+ if (gpio_init())
+ return -EINVAL;
+
+ early_platform_driver_register_all("earlygpio");
+ early_platform_driver_probe("earlygpio", gpio_bank_count, 0);
+ return 0;
+}
--
1.6.3.3
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