arch/arm/mach-omap2/gpio.c

   1 /*
   2  * OMAP2+ specific gpio initialization
   3  *
   4  * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
   5  *
   6  * Author:
   7  *      Charulatha V <charu@ti.com>
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License as
  11  * published by the Free Software Foundation version 2.
  12  *
  13  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  14  * kind, whether express or implied; without even the implied warranty
  15  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  */
  18
  19 #include <linux/gpio.h>
  20 #include <linux/err.h>
  21 #include <linux/slab.h>
  22 #include <linux/interrupt.h>
  23
  24 #include <plat/omap_hwmod.h>
  25 #include <plat/omap_device.h>
  26
  27 static struct omap_device_pm_latency omap_gpio_latency[] = {
  28         [0] = {
  29                 .deactivate_func = omap_device_idle_hwmods,
  30                 .activate_func   = omap_device_enable_hwmods,
  31                 .flags           = OMAP_DEVICE_LATENCY_AUTO_ADJUST,
  32         },
  33 };
  34
  35 static int omap2_gpio_dev_init(struct omap_hwmod *oh, void *unused)
  36 {
  37         struct omap_device *od;
  38         struct omap_gpio_platform_data *pdata;
  39         struct omap_gpio_dev_attr *dev_attr;
  40         char *name = "omap_gpio";
  41         int id;
  42
  43         /*
  44          * extract the device id from name field available in the
  45          * hwmod database and use the same for constructing ids for
  46          * gpio devices.
  47          * CAUTION: Make sure the name in the hwmod database does
  48          * not change. If changed, make corresponding change here
  49          * or make use of static variable mechanism to handle this.
  50          */
  51         sscanf(oh->name, "gpio%d", &id);
  52
  53         pdata = kzalloc(sizeof(struct omap_gpio_platform_data), GFP_KERNEL);
  54         if (!pdata) {
  55                 pr_err("gpio%d: Memory allocation failed\n", id);
  56                 return -ENOMEM;
  57         }
  58
  59         dev_attr = (struct omap_gpio_dev_attr *)oh->dev_attr;
  60         pdata->bank_width = dev_attr->bank_width;
  61         pdata->dbck_flag = dev_attr->dbck_flag;
  62         pdata->virtual_irq_start = IH_GPIO_BASE + 32 * (id - 1);
  63
  64         switch (oh->class->rev) {
  65         case 0:
  66         case 1:
  67                 pdata->bank_type = METHOD_GPIO_24XX;
  68                 break;
  69         case 2:
  70                 pdata->bank_type = METHOD_GPIO_44XX;
  71                 break;
  72         default:
  73                 WARN(1, "Invalid gpio bank_type\n");
  74                 kfree(pdata);
  75                 return -EINVAL;
  76         }
  77
  78         od = omap_device_build(name, id - 1, oh, pdata,
  79                                 sizeof(*pdata), omap_gpio_latency,
  80                                 ARRAY_SIZE(omap_gpio_latency),
  81                                 false);
  82         kfree(pdata);
  83
  84         if (IS_ERR(od)) {
  85                 WARN(1, "Can't build omap_device for %s:%s.\n",
  86                                         name, oh->name);
  87                 return PTR_ERR(od);
  88         }
  89
  90         gpio_bank_count++;
  91         return 0;
  92 }
  93
  94 /*
  95  * gpio_init needs to be done before
  96  * machine_init functions access gpio APIs.
  97  * Hence gpio_init is a postcore_initcall.
  98  */
  99 static int __init omap2_gpio_init(void)
 100 {
 101         return omap_hwmod_for_each_by_class("gpio", omap2_gpio_dev_init,
 102                                                 NULL);
 103 }
 104 postcore_initcall(omap2_gpio_init);