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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>
This commit is contained in:
Varadarajan, Charulatha 2010-12-07 16:26:57 -08:00 committed by Tony Lindgren
parent 9780a9cfa7
commit f547170fe7
1 changed files with 104 additions and 0 deletions
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104
arch/arm/mach-omap2/gpio.c Normal file
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/*
* 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);