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 <[email protected]> Signed-off-by: Basak, Partha <[email protected]> --- 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 <[email protected]> + * + * 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 -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
