diff options
Diffstat (limited to 'arch/arm/mach-omap2/gpio.c')
| -rw-r--r-- | arch/arm/mach-omap2/gpio.c | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/gpio.c b/arch/arm/mach-omap2/gpio.c new file mode 100644 index 00000000..2f994e51 --- /dev/null +++ b/arch/arm/mach-omap2/gpio.c @@ -0,0 +1,152 @@ +/* + * 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> +#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->virtual_irq_start = IH_GPIO_BASE + 32 * (id - 1); + 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) { + pr_err("gpio%d: Memory allocation failed\n", id); + 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 = 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); + 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) +{ + return omap_hwmod_for_each_by_class("gpio", omap2_gpio_dev_init, + NULL); +} +postcore_initcall(omap2_gpio_init); |