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 #include <linux/of.h>
  24
  25 #include <plat/omap_hwmod.h>
  26 #include <plat/omap_device.h>
  27 #include <plat/omap-pm.h>
  28
  29 #include "powerdomain.h"
  30
  31 static int __init omap2_gpio_dev_init(struct omap_hwmod *oh, void *unused)
  32 {
  33         struct platform_device *pdev;
  34         struct omap_gpio_platform_data *pdata;
  35         struct omap_gpio_dev_attr *dev_attr;
  36         char *name = "omap_gpio";
  37         int id;
  38         struct powerdomain *pwrdm;
  39
  40         /*
  41          * extract the device id from name field available in the
  42          * hwmod database and use the same for constructing ids for
  43          * gpio devices.
  44          * CAUTION: Make sure the name in the hwmod database does
  45          * not change. If changed, make corresponding change here
  46          * or make use of static variable mechanism to handle this.
  47          */
  48         sscanf(oh->name, "gpio%d", &id);
  49
  50         pdata = kzalloc(sizeof(struct omap_gpio_platform_data), GFP_KERNEL);
  51         if (!pdata) {
  52                 pr_err("gpio%d: Memory allocation failed\n", id);
  53                 return -ENOMEM;
  54         }
  55
  56         dev_attr = (struct omap_gpio_dev_attr *)oh->dev_attr;
  57         pdata->bank_width = dev_attr->bank_width;
  58         pdata->dbck_flag = dev_attr->dbck_flag;
  59         pdata->virtual_irq_start = IH_GPIO_BASE + 32 * (id - 1);
  60         pdata->get_context_loss_count = omap_pm_get_dev_context_loss_count;
  61         pdata->regs = kzalloc(sizeof(struct omap_gpio_reg_offs), GFP_KERNEL);
  62         if (!pdata) {
  63                 pr_err("gpio%d: Memory allocation failed\n", id);
  64                 return -ENOMEM;
  65         }
  66
  67         switch (oh->class->rev) {
  68         case 0:
  69                 if (id == 1)
  70                         /* non-wakeup GPIO pins for OMAP2 Bank1 */
  71                         pdata->non_wakeup_gpios = 0xe203ffc0;
  72                 else if (id == 2)
  73                         /* non-wakeup GPIO pins for OMAP2 Bank2 */
  74                         pdata->non_wakeup_gpios = 0x08700040;
  75                 /* fall through */
  76
  77         case 1:
  78                 pdata->regs->revision = OMAP24XX_GPIO_REVISION;
  79                 pdata->regs->direction = OMAP24XX_GPIO_OE;
  80                 pdata->regs->datain = OMAP24XX_GPIO_DATAIN;
  81                 pdata->regs->dataout = OMAP24XX_GPIO_DATAOUT;
  82                 pdata->regs->set_dataout = OMAP24XX_GPIO_SETDATAOUT;
  83                 pdata->regs->clr_dataout = OMAP24XX_GPIO_CLEARDATAOUT;
  84                 pdata->regs->irqstatus = OMAP24XX_GPIO_IRQSTATUS1;
  85                 pdata->regs->irqstatus2 = OMAP24XX_GPIO_IRQSTATUS2;
  86                 pdata->regs->irqenable = OMAP24XX_GPIO_IRQENABLE1;
  87                 pdata->regs->irqenable2 = OMAP24XX_GPIO_IRQENABLE2;
  88                 pdata->regs->set_irqenable = OMAP24XX_GPIO_SETIRQENABLE1;
  89                 pdata->regs->clr_irqenable = OMAP24XX_GPIO_CLEARIRQENABLE1;
  90                 pdata->regs->debounce = OMAP24XX_GPIO_DEBOUNCE_VAL;
  91                 pdata->regs->debounce_en = OMAP24XX_GPIO_DEBOUNCE_EN;
  92                 pdata->regs->ctrl = OMAP24XX_GPIO_CTRL;
  93                 pdata->regs->wkup_en = OMAP24XX_GPIO_WAKE_EN;
  94                 pdata->regs->leveldetect0 = OMAP24XX_GPIO_LEVELDETECT0;
  95                 pdata->regs->leveldetect1 = OMAP24XX_GPIO_LEVELDETECT1;
  96                 pdata->regs->risingdetect = OMAP24XX_GPIO_RISINGDETECT;
  97                 pdata->regs->fallingdetect = OMAP24XX_GPIO_FALLINGDETECT;
  98                 break;
  99         case 2:
 100                 pdata->regs->revision = OMAP4_GPIO_REVISION;
 101                 pdata->regs->direction = OMAP4_GPIO_OE;
 102                 pdata->regs->datain = OMAP4_GPIO_DATAIN;
 103                 pdata->regs->dataout = OMAP4_GPIO_DATAOUT;
 104                 pdata->regs->set_dataout = OMAP4_GPIO_SETDATAOUT;
 105                 pdata->regs->clr_dataout = OMAP4_GPIO_CLEARDATAOUT;
 106                 pdata->regs->irqstatus = OMAP4_GPIO_IRQSTATUS0;
 107                 pdata->regs->irqstatus2 = OMAP4_GPIO_IRQSTATUS1;
 108                 pdata->regs->irqenable = OMAP4_GPIO_IRQSTATUSSET0;
 109                 pdata->regs->irqenable2 = OMAP4_GPIO_IRQSTATUSSET1;
 110                 pdata->regs->set_irqenable = OMAP4_GPIO_IRQSTATUSSET0;
 111                 pdata->regs->clr_irqenable = OMAP4_GPIO_IRQSTATUSCLR0;
 112                 pdata->regs->debounce = OMAP4_GPIO_DEBOUNCINGTIME;
 113                 pdata->regs->debounce_en = OMAP4_GPIO_DEBOUNCENABLE;
 114                 pdata->regs->ctrl = OMAP4_GPIO_CTRL;
 115                 pdata->regs->wkup_en = OMAP4_GPIO_IRQWAKEN0;
 116                 pdata->regs->leveldetect0 = OMAP4_GPIO_LEVELDETECT0;
 117                 pdata->regs->leveldetect1 = OMAP4_GPIO_LEVELDETECT1;
 118                 pdata->regs->risingdetect = OMAP4_GPIO_RISINGDETECT;
 119                 pdata->regs->fallingdetect = OMAP4_GPIO_FALLINGDETECT;
 120                 break;
 121         default:
 122                 WARN(1, "Invalid gpio bank_type\n");
 123                 kfree(pdata);
 124                 return -EINVAL;
 125         }
 126
 127         pwrdm = omap_hwmod_get_pwrdm(oh);
 128         pdata->loses_context = pwrdm_can_ever_lose_context(pwrdm);
 129
 130         pdev = omap_device_build(name, id - 1, oh, pdata,
 131                                 sizeof(*pdata), NULL, 0, false);
 132         kfree(pdata);
 133
 134         if (IS_ERR(pdev)) {
 135                 WARN(1, "Can't build omap_device for %s:%s.\n",
 136                                         name, oh->name);
 137                 return PTR_ERR(pdev);
 138         }
 139
 140         return 0;
 141 }
 142
 143 /*
 144  * gpio_init needs to be done before
 145  * machine_init functions access gpio APIs.
 146  * Hence gpio_init is a postcore_initcall.
 147  */
 148 static int __init omap2_gpio_init(void)
 149 {
 150         /* If dtb is there, the devices will be created dynamically */
 151         if (of_have_populated_dt())
 152                 return -ENODEV;
 153
 154         return omap_hwmod_for_each_by_class("gpio", omap2_gpio_dev_init, NULL);
 155 }
 156 postcore_initcall(omap2_gpio_init);