diff options
| -rw-r--r-- | arch/arm/mach-omap2/gpio.c | 104 |
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 00000000000..413de18c1d2 --- /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); |