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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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* Copyright (C) 2010 John Crispin <blogic@openwrt.org>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/gpio.h>
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#include <linux/ioport.h>
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#include <lantiq_soc.h>
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#define LTQ_GPIO_OUT 0x00
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#define LTQ_GPIO_IN 0x04
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#define LTQ_GPIO_DIR 0x08
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#define LTQ_GPIO_ALTSEL0 0x0C
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#define LTQ_GPIO_ALTSEL1 0x10
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#define LTQ_GPIO_OD 0x14
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#define PINS_PER_PORT 16
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#define ltq_gpio_getbit(m, r, p) (!!(ltq_r32(m + r) & (1 << p)))
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#define ltq_gpio_setbit(m, r, p) ltq_w32_mask(0, (1 << p), m + r)
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#define ltq_gpio_clearbit(m, r, p) ltq_w32_mask((1 << p), 0, m + r)
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void __iomem *membase;
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struct gpio_chip chip;
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static struct ltq_gpio ltq_gpio_port[MAX_PORTS];
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int gpio_to_irq(unsigned int gpio)
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EXPORT_SYMBOL(gpio_to_irq);
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int irq_to_gpio(unsigned int gpio)
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EXPORT_SYMBOL(irq_to_gpio);
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int ltq_gpio_request(unsigned int pin, unsigned int alt0,
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unsigned int alt1, unsigned int dir, const char *name)
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if (pin >= (MAX_PORTS * PINS_PER_PORT))
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if (gpio_request(pin, name)) {
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pr_err("failed to setup lantiq gpio: %s\n", name);
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gpio_direction_output(pin, 1);
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gpio_direction_input(pin);
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while (pin >= PINS_PER_PORT) {
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ltq_gpio_setbit(ltq_gpio_port[id].membase,
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LTQ_GPIO_ALTSEL0, pin);
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ltq_gpio_clearbit(ltq_gpio_port[id].membase,
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LTQ_GPIO_ALTSEL0, pin);
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ltq_gpio_setbit(ltq_gpio_port[id].membase,
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LTQ_GPIO_ALTSEL1, pin);
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ltq_gpio_clearbit(ltq_gpio_port[id].membase,
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LTQ_GPIO_ALTSEL1, pin);
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EXPORT_SYMBOL(ltq_gpio_request);
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static void ltq_gpio_set(struct gpio_chip *chip, unsigned int offset, int value)
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struct ltq_gpio *ltq_gpio = container_of(chip, struct ltq_gpio, chip);
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ltq_gpio_setbit(ltq_gpio->membase, LTQ_GPIO_OUT, offset);
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ltq_gpio_clearbit(ltq_gpio->membase, LTQ_GPIO_OUT, offset);
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static int ltq_gpio_get(struct gpio_chip *chip, unsigned int offset)
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struct ltq_gpio *ltq_gpio = container_of(chip, struct ltq_gpio, chip);
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return ltq_gpio_getbit(ltq_gpio->membase, LTQ_GPIO_IN, offset);
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static int ltq_gpio_direction_input(struct gpio_chip *chip, unsigned int offset)
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struct ltq_gpio *ltq_gpio = container_of(chip, struct ltq_gpio, chip);
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ltq_gpio_clearbit(ltq_gpio->membase, LTQ_GPIO_OD, offset);
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ltq_gpio_clearbit(ltq_gpio->membase, LTQ_GPIO_DIR, offset);
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static int ltq_gpio_direction_output(struct gpio_chip *chip,
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unsigned int offset, int value)
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struct ltq_gpio *ltq_gpio = container_of(chip, struct ltq_gpio, chip);
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ltq_gpio_setbit(ltq_gpio->membase, LTQ_GPIO_OD, offset);
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ltq_gpio_setbit(ltq_gpio->membase, LTQ_GPIO_DIR, offset);
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ltq_gpio_set(chip, offset, value);
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static int ltq_gpio_req(struct gpio_chip *chip, unsigned offset)
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struct ltq_gpio *ltq_gpio = container_of(chip, struct ltq_gpio, chip);
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ltq_gpio_clearbit(ltq_gpio->membase, LTQ_GPIO_ALTSEL0, offset);
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ltq_gpio_clearbit(ltq_gpio->membase, LTQ_GPIO_ALTSEL1, offset);
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static int ltq_gpio_probe(struct platform_device *pdev)
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struct resource *res;
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if (pdev->id >= MAX_PORTS) {
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dev_err(&pdev->dev, "invalid gpio port %d\n",
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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dev_err(&pdev->dev, "failed to get memory for gpio port %d\n",
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res = devm_request_mem_region(&pdev->dev, res->start,
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resource_size(res), dev_name(&pdev->dev));
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"failed to request memory for gpio port %d\n",
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ltq_gpio_port[pdev->id].membase = devm_ioremap_nocache(&pdev->dev,
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res->start, resource_size(res));
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if (!ltq_gpio_port[pdev->id].membase) {
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dev_err(&pdev->dev, "failed to remap memory for gpio port %d\n",
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ltq_gpio_port[pdev->id].chip.label = "ltq_gpio";
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ltq_gpio_port[pdev->id].chip.direction_input = ltq_gpio_direction_input;
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ltq_gpio_port[pdev->id].chip.direction_output =
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ltq_gpio_direction_output;
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ltq_gpio_port[pdev->id].chip.get = ltq_gpio_get;
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ltq_gpio_port[pdev->id].chip.set = ltq_gpio_set;
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ltq_gpio_port[pdev->id].chip.request = ltq_gpio_req;
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ltq_gpio_port[pdev->id].chip.base = PINS_PER_PORT * pdev->id;
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ltq_gpio_port[pdev->id].chip.ngpio = PINS_PER_PORT;
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platform_set_drvdata(pdev, <q_gpio_port[pdev->id]);
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return gpiochip_add(<q_gpio_port[pdev->id].chip);
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static struct platform_driver
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.probe = ltq_gpio_probe,
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.owner = THIS_MODULE,
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int __init ltq_gpio_init(void)
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int ret = platform_driver_register(<q_gpio_driver);
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pr_info("ltq_gpio : Error registering platfom driver!");
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postcore_initcall(ltq_gpio_init);