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 int omap2_gpio_dev_init(struct omap_hwmod *oh, void *unused)
  28 {
  29         struct platform_device *pdev;
  30         struct omap_gpio_platform_data *pdata;
  31         struct omap_gpio_dev_attr *dev_attr;
  32         char *name = "omap_gpio";
  33         int id;
  34
  35         /*
  36          * extract the device id from name field available in the
  37          * hwmod database and use the same for constructing ids for
  38          * gpio devices.
  39          * CAUTION: Make sure the name in the hwmod database does
  40          * not change. If changed, make corresponding change here
  41          * or make use of static variable mechanism to handle this.
  42          */
  43         sscanf(oh->name, "gpio%d", &id);
  44
  45         pdata = kzalloc(sizeof(struct omap_gpio_platform_data), GFP_KERNEL);
  46         if (!pdata) {
  47                 pr_err("gpio%d: Memory allocation failed\n", id);
  48                 return -ENOMEM;
  49         }
  50
  51         dev_attr = (struct omap_gpio_dev_attr *)oh->dev_attr;
  52         pdata->bank_width = dev_attr->bank_width;
  53         pdata->dbck_flag = dev_attr->dbck_flag;
  54         pdata->virtual_irq_start = IH_GPIO_BASE + 32 * (id - 1);
  55
  56         pdata->regs = kzalloc(sizeof(struct omap_gpio_reg_offs), GFP_KERNEL);
  57         if (!pdata) {
  58                 pr_err("gpio%d: Memory allocation failed\n", id);
  59                 return -ENOMEM;
  60         }
  61
  62         switch (oh->class->rev) {
  63         case 0:
  64         case 1:
  65                 pdata->bank_type = METHOD_GPIO_24XX;
  66                 pdata->regs->revision = OMAP24XX_GPIO_REVISION;
  67                 pdata->regs->direction = OMAP24XX_GPIO_OE;
  68                 pdata->regs->datain = OMAP24XX_GPIO_DATAIN;
  69                 pdata->regs->dataout = OMAP24XX_GPIO_DATAOUT;
  70                 pdata->regs->set_dataout = OMAP24XX_GPIO_SETDATAOUT;
  71                 pdata->regs->clr_dataout = OMAP24XX_GPIO_CLEARDATAOUT;
  72                 pdata->regs->irqstatus = OMAP24XX_GPIO_IRQSTATUS1;
  73                 pdata->regs->irqstatus2 = OMAP24XX_GPIO_IRQSTATUS2;
  74                 pdata->regs->irqenable = OMAP24XX_GPIO_IRQENABLE1;
  75                 pdata->regs->set_irqenable = OMAP24XX_GPIO_SETIRQENABLE1;
  76                 pdata->regs->clr_irqenable = OMAP24XX_GPIO_CLEARIRQENABLE1;
  77                 pdata->regs->debounce = OMAP24XX_GPIO_DEBOUNCE_VAL;
  78                 pdata->regs->debounce_en = OMAP24XX_GPIO_DEBOUNCE_EN;
  79                 break;
  80         case 2:
  81                 pdata->bank_type = METHOD_GPIO_44XX;
  82                 pdata->regs->revision = OMAP4_GPIO_REVISION;
  83                 pdata->regs->direction = OMAP4_GPIO_OE;
  84                 pdata->regs->datain = OMAP4_GPIO_DATAIN;
  85                 pdata->regs->dataout = OMAP4_GPIO_DATAOUT;
  86                 pdata->regs->set_dataout = OMAP4_GPIO_SETDATAOUT;
  87                 pdata->regs->clr_dataout = OMAP4_GPIO_CLEARDATAOUT;
  88                 pdata->regs->irqstatus = OMAP4_GPIO_IRQSTATUS0;
  89                 pdata->regs->irqstatus2 = OMAP4_GPIO_IRQSTATUS1;
  90                 pdata->regs->irqenable = OMAP4_GPIO_IRQSTATUSSET0;
  91                 pdata->regs->set_irqenable = OMAP4_GPIO_IRQSTATUSSET0;
  92                 pdata->regs->clr_irqenable = OMAP4_GPIO_IRQSTATUSCLR0;
  93                 pdata->regs->debounce = OMAP4_GPIO_DEBOUNCINGTIME;
  94                 pdata->regs->debounce_en = OMAP4_GPIO_DEBOUNCENABLE;
  95                 break;
  96         default:
  97                 WARN(1, "Invalid gpio bank_type\n");
  98                 kfree(pdata);
  99                 return -EINVAL;
 100         }
 101
 102         pdev = omap_device_build(name, id - 1, oh, pdata,
 103                                 sizeof(*pdata), NULL, 0, false);
 104         kfree(pdata);
 105
 106         if (IS_ERR(pdev)) {
 107                 WARN(1, "Can't build omap_device for %s:%s.\n",
 108                                         name, oh->name);
 109                 return PTR_ERR(pdev);
 110         }
 111
 112         omap_device_disable_idle_on_suspend(pdev);
 113
 114         gpio_bank_count++;
 115         return 0;
 116 }
 117
 118 /*
 119  * gpio_init needs to be done before
 120  * machine_init functions access gpio APIs.
 121  * Hence gpio_init is a postcore_initcall.
 122  */
 123 static int __init omap2_gpio_init(void)
 124 {
 125         return omap_hwmod_for_each_by_class("gpio", omap2_gpio_dev_init,
 126                                                 NULL);
 127 }
 128 postcore_initcall(omap2_gpio_init);