gpio.c

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/*
 * OMAP2+ specific gpio initialization
 *
 * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
 *
 * 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 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 <linux/of.h>
#include <linux/platform_data/gpio-omap.h>

#include <plat/omap_hwmod.h>
#include <plat/omap_device.h>
#include <plat/omap-pm.h>

#include "powerdomain.h"

static int __init omap2_gpio_dev_init(struct omap_hwmod *oh, void *unused)
{
    struct platform_device *pdev;
    struct omap_gpio_platform_data *pdata;
    struct omap_gpio_dev_attr *dev_attr;
    char *name = "omap_gpio";
    int id;
    struct powerdomain *pwrdm;

    /*
     * 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->get_context_loss_count = omap_pm_get_dev_context_loss_count;
    pdata->regs = kzalloc(sizeof(struct omap_gpio_reg_offs), GFP_KERNEL);
    if (!pdata->regs) {
        pr_err("gpio%d: Memory allocation failed\n", id);
        kfree(pdata);
        return -ENOMEM;
    }

    switch (oh->class->rev) {
    case 0:
        if (id == 1)
            /* non-wakeup GPIO pins for OMAP2 Bank1 */
            pdata->non_wakeup_gpios = 0xe203ffc0;
        else if (id == 2)
            /* non-wakeup GPIO pins for OMAP2 Bank2 */
            pdata->non_wakeup_gpios = 0x08700040;
        /* fall through */

    case 1:
        pdata->regs->revision = OMAP24XX_GPIO_REVISION;
        pdata->regs->direction = OMAP24XX_GPIO_OE;
        pdata->regs->datain = OMAP24XX_GPIO_DATAIN;
        pdata->regs->dataout = OMAP24XX_GPIO_DATAOUT;
        pdata->regs->set_dataout = OMAP24XX_GPIO_SETDATAOUT;
        pdata->regs->clr_dataout = OMAP24XX_GPIO_CLEARDATAOUT;
        pdata->regs->irqstatus = OMAP24XX_GPIO_IRQSTATUS1;
        pdata->regs->irqstatus2 = OMAP24XX_GPIO_IRQSTATUS2;
        pdata->regs->irqenable = OMAP24XX_GPIO_IRQENABLE1;
        pdata->regs->irqenable2 = OMAP24XX_GPIO_IRQENABLE2;
        pdata->regs->set_irqenable = OMAP24XX_GPIO_SETIRQENABLE1;
        pdata->regs->clr_irqenable = OMAP24XX_GPIO_CLEARIRQENABLE1;
        pdata->regs->debounce = OMAP24XX_GPIO_DEBOUNCE_VAL;
        pdata->regs->debounce_en = OMAP24XX_GPIO_DEBOUNCE_EN;
        pdata->regs->ctrl = OMAP24XX_GPIO_CTRL;
        pdata->regs->wkup_en = OMAP24XX_GPIO_WAKE_EN;
        pdata->regs->leveldetect0 = OMAP24XX_GPIO_LEVELDETECT0;
        pdata->regs->leveldetect1 = OMAP24XX_GPIO_LEVELDETECT1;
        pdata->regs->risingdetect = OMAP24XX_GPIO_RISINGDETECT;
        pdata->regs->fallingdetect = OMAP24XX_GPIO_FALLINGDETECT;
        break;
    case 2:
        pdata->regs->revision = OMAP4_GPIO_REVISION;
        pdata->regs->direction = OMAP4_GPIO_OE;
        pdata->regs->datain = OMAP4_GPIO_DATAIN;
        pdata->regs->dataout = OMAP4_GPIO_DATAOUT;
        pdata->regs->set_dataout = OMAP4_GPIO_SETDATAOUT;
        pdata->regs->clr_dataout = OMAP4_GPIO_CLEARDATAOUT;
        pdata->regs->irqstatus_raw0 = OMAP4_GPIO_IRQSTATUSRAW0;
        pdata->regs->irqstatus_raw1 = OMAP4_GPIO_IRQSTATUSRAW1;
        pdata->regs->irqstatus = OMAP4_GPIO_IRQSTATUS0;
        pdata->regs->irqstatus2 = OMAP4_GPIO_IRQSTATUS1;
        pdata->regs->irqenable = OMAP4_GPIO_IRQSTATUSSET0;
        pdata->regs->irqenable2 = OMAP4_GPIO_IRQSTATUSSET1;
        pdata->regs->set_irqenable = OMAP4_GPIO_IRQSTATUSSET0;
        pdata->regs->clr_irqenable = OMAP4_GPIO_IRQSTATUSCLR0;
        pdata->regs->debounce = OMAP4_GPIO_DEBOUNCINGTIME;
        pdata->regs->debounce_en = OMAP4_GPIO_DEBOUNCENABLE;
        pdata->regs->ctrl = OMAP4_GPIO_CTRL;
        pdata->regs->wkup_en = OMAP4_GPIO_IRQWAKEN0;
        pdata->regs->leveldetect0 = OMAP4_GPIO_LEVELDETECT0;
        pdata->regs->leveldetect1 = OMAP4_GPIO_LEVELDETECT1;
        pdata->regs->risingdetect = OMAP4_GPIO_RISINGDETECT;
        pdata->regs->fallingdetect = OMAP4_GPIO_FALLINGDETECT;
        break;
    default:
        WARN(1, "Invalid gpio bank_type\n");
        kfree(pdata->regs);
        kfree(pdata);
        return -EINVAL;
    }

    pwrdm = omap_hwmod_get_pwrdm(oh);
    pdata->loses_context = pwrdm_can_ever_lose_context(pwrdm);

    pdev = omap_device_build(name, id - 1, oh, pdata,
                sizeof(*pdata), NULL, 0, false);
    kfree(pdata);

    if (IS_ERR(pdev)) {
        WARN(1, "Can't build omap_device for %s:%s.\n",
                    name, oh->name);
        return PTR_ERR(pdev);
    }

    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)
{
    /* If dtb is there, the devices will be created dynamically */
    if (of_have_populated_dt())
        return -ENODEV;

    return omap_hwmod_for_each_by_class("gpio", omap2_gpio_dev_init, NULL);
}
postcore_initcall(omap2_gpio_init);