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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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164 lines
3.9 KiB
C
164 lines
3.9 KiB
C
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/* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*
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*/
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#include <linux/gpio.h>
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#include <linux/io.h>
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#include <linux/irq.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/spinlock.h>
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#include <mach/msm_iomap.h>
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#include "gpiomux.h"
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/* Bits of interest in the GPIO_IN_OUT register.
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*/
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enum {
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GPIO_IN_BIT = 0,
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GPIO_OUT_BIT = 1
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};
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/* Bits of interest in the GPIO_CFG register.
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*/
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enum {
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GPIO_OE_BIT = 9,
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};
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#define GPIO_CONFIG(gpio) (MSM_TLMM_BASE + 0x1000 + (0x10 * (gpio)))
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#define GPIO_IN_OUT(gpio) (MSM_TLMM_BASE + 0x1004 + (0x10 * (gpio)))
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static DEFINE_SPINLOCK(tlmm_lock);
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static int msm_gpio_get(struct gpio_chip *chip, unsigned offset)
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{
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return readl(GPIO_IN_OUT(offset)) & BIT(GPIO_IN_BIT);
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}
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static void msm_gpio_set(struct gpio_chip *chip, unsigned offset, int val)
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{
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writel(val ? BIT(GPIO_OUT_BIT) : 0, GPIO_IN_OUT(offset));
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}
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static int msm_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
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{
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unsigned long irq_flags;
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spin_lock_irqsave(&tlmm_lock, irq_flags);
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writel(readl(GPIO_CONFIG(offset)) & ~BIT(GPIO_OE_BIT),
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GPIO_CONFIG(offset));
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spin_unlock_irqrestore(&tlmm_lock, irq_flags);
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return 0;
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}
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static int msm_gpio_direction_output(struct gpio_chip *chip,
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unsigned offset,
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int val)
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{
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unsigned long irq_flags;
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spin_lock_irqsave(&tlmm_lock, irq_flags);
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msm_gpio_set(chip, offset, val);
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writel(readl(GPIO_CONFIG(offset)) | BIT(GPIO_OE_BIT),
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GPIO_CONFIG(offset));
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spin_unlock_irqrestore(&tlmm_lock, irq_flags);
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return 0;
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}
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static int msm_gpio_request(struct gpio_chip *chip, unsigned offset)
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{
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return msm_gpiomux_get(chip->base + offset);
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}
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static void msm_gpio_free(struct gpio_chip *chip, unsigned offset)
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{
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msm_gpiomux_put(chip->base + offset);
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}
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static struct gpio_chip msm_gpio = {
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.base = 0,
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.ngpio = NR_GPIO_IRQS,
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.direction_input = msm_gpio_direction_input,
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.direction_output = msm_gpio_direction_output,
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.get = msm_gpio_get,
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.set = msm_gpio_set,
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.request = msm_gpio_request,
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.free = msm_gpio_free,
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};
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static int __devinit msm_gpio_probe(struct platform_device *dev)
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{
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int ret;
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msm_gpio.label = dev->name;
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ret = gpiochip_add(&msm_gpio);
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return ret;
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}
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static int __devexit msm_gpio_remove(struct platform_device *dev)
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{
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int ret = gpiochip_remove(&msm_gpio);
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if (ret < 0)
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return ret;
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set_irq_handler(TLMM_SCSS_SUMMARY_IRQ, NULL);
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return 0;
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}
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static struct platform_driver msm_gpio_driver = {
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.probe = msm_gpio_probe,
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.remove = __devexit_p(msm_gpio_remove),
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.driver = {
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.name = "msmgpio",
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.owner = THIS_MODULE,
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},
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};
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static struct platform_device msm_device_gpio = {
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.name = "msmgpio",
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.id = -1,
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};
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static int __init msm_gpio_init(void)
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{
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int rc;
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rc = platform_driver_register(&msm_gpio_driver);
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if (!rc) {
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rc = platform_device_register(&msm_device_gpio);
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if (rc)
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platform_driver_unregister(&msm_gpio_driver);
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}
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return rc;
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}
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static void __exit msm_gpio_exit(void)
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{
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platform_device_unregister(&msm_device_gpio);
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platform_driver_unregister(&msm_gpio_driver);
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}
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postcore_initcall(msm_gpio_init);
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module_exit(msm_gpio_exit);
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MODULE_AUTHOR("Gregory Bean <gbean@codeaurora.org>");
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MODULE_DESCRIPTION("Driver for Qualcomm MSM TLMMv2 SoC GPIOs");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("platform:msmgpio");
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