GPIO: clps711x: Rewrite driver for using generic GPIO code
This patch provides rewritten driver for CLPS711X GPIO which uses generic GPIO code. Signed-off-by: Alexander Shiyan <shc_work@mail.ru> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Olof Johansson <olof@lixom.net>hifive-unleashed-5.1
Alexander Shiyan
Olof Johansson
parent
d683b96b07
commit
55fe14ab87
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@ -109,8 +109,11 @@ config GPIO_MAX730X
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comment "Memory mapped GPIO drivers:"
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config GPIO_CLPS711X
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def_bool y
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tristate "CLPS711X GPIO support"
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depends on ARCH_CLPS711X
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select GPIO_GENERIC
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help
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Say yes here to support GPIO on CLPS711X SoCs.
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config GPIO_GENERIC_PLATFORM
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tristate "Generic memory-mapped GPIO controller support (MMIO platform device)"
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@ -1,7 +1,7 @@
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/*
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* CLPS711X GPIO driver
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*
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* Copyright (C) 2012 Alexander Shiyan <shc_work@mail.ru>
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* Copyright (C) 2012,2013 Alexander Shiyan <shc_work@mail.ru>
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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 as published by
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@ -9,191 +9,83 @@
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* (at your option) any later version.
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*/
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#include <linux/io.h>
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#include <linux/slab.h>
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#include <linux/err.h>
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#include <linux/gpio.h>
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#include <linux/module.h>
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#include <linux/spinlock.h>
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#include <linux/basic_mmio_gpio.h>
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#include <linux/platform_device.h>
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#include <mach/hardware.h>
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#define CLPS711X_GPIO_PORTS 5
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#define CLPS711X_GPIO_NAME "gpio-clps711x"
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struct clps711x_gpio {
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struct gpio_chip chip[CLPS711X_GPIO_PORTS];
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spinlock_t lock;
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};
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static void __iomem *clps711x_ports[] = {
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CLPS711X_VIRT_BASE + PADR,
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CLPS711X_VIRT_BASE + PBDR,
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CLPS711X_VIRT_BASE + PCDR,
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CLPS711X_VIRT_BASE + PDDR,
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CLPS711X_VIRT_BASE + PEDR,
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};
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static void __iomem *clps711x_pdirs[] = {
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CLPS711X_VIRT_BASE + PADDR,
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CLPS711X_VIRT_BASE + PBDDR,
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CLPS711X_VIRT_BASE + PCDDR,
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CLPS711X_VIRT_BASE + PDDDR,
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CLPS711X_VIRT_BASE + PEDDR,
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};
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#define clps711x_port(x) clps711x_ports[x->base / 8]
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#define clps711x_pdir(x) clps711x_pdirs[x->base / 8]
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static int gpio_clps711x_get(struct gpio_chip *chip, unsigned offset)
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static int clps711x_gpio_probe(struct platform_device *pdev)
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{
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return !!(readb(clps711x_port(chip)) & (1 << offset));
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}
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void __iomem *dat, *dir;
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struct bgpio_chip *bgc;
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struct resource *res;
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int err, id = pdev->id;
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static void gpio_clps711x_set(struct gpio_chip *chip, unsigned offset,
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int value)
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{
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int tmp;
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unsigned long flags;
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struct clps711x_gpio *gpio = dev_get_drvdata(chip->dev);
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if ((id < 0) || (id > 4))
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return -ENODEV;
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spin_lock_irqsave(&gpio->lock, flags);
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tmp = readb(clps711x_port(chip)) & ~(1 << offset);
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if (value)
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tmp |= 1 << offset;
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writeb(tmp, clps711x_port(chip));
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spin_unlock_irqrestore(&gpio->lock, flags);
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}
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static int gpio_clps711x_dir_in(struct gpio_chip *chip, unsigned offset)
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{
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int tmp;
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unsigned long flags;
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struct clps711x_gpio *gpio = dev_get_drvdata(chip->dev);
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spin_lock_irqsave(&gpio->lock, flags);
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tmp = readb(clps711x_pdir(chip)) & ~(1 << offset);
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writeb(tmp, clps711x_pdir(chip));
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spin_unlock_irqrestore(&gpio->lock, flags);
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return 0;
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}
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static int gpio_clps711x_dir_out(struct gpio_chip *chip, unsigned offset,
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int value)
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{
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int tmp;
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unsigned long flags;
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struct clps711x_gpio *gpio = dev_get_drvdata(chip->dev);
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spin_lock_irqsave(&gpio->lock, flags);
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tmp = readb(clps711x_pdir(chip)) | (1 << offset);
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writeb(tmp, clps711x_pdir(chip));
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tmp = readb(clps711x_port(chip)) & ~(1 << offset);
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if (value)
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tmp |= 1 << offset;
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writeb(tmp, clps711x_port(chip));
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spin_unlock_irqrestore(&gpio->lock, flags);
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return 0;
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}
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static int gpio_clps711x_dir_in_inv(struct gpio_chip *chip, unsigned offset)
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{
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int tmp;
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unsigned long flags;
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struct clps711x_gpio *gpio = dev_get_drvdata(chip->dev);
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spin_lock_irqsave(&gpio->lock, flags);
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tmp = readb(clps711x_pdir(chip)) | (1 << offset);
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writeb(tmp, clps711x_pdir(chip));
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spin_unlock_irqrestore(&gpio->lock, flags);
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return 0;
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}
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static int gpio_clps711x_dir_out_inv(struct gpio_chip *chip, unsigned offset,
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int value)
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{
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int tmp;
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unsigned long flags;
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struct clps711x_gpio *gpio = dev_get_drvdata(chip->dev);
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spin_lock_irqsave(&gpio->lock, flags);
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tmp = readb(clps711x_pdir(chip)) & ~(1 << offset);
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writeb(tmp, clps711x_pdir(chip));
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tmp = readb(clps711x_port(chip)) & ~(1 << offset);
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if (value)
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tmp |= 1 << offset;
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writeb(tmp, clps711x_port(chip));
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spin_unlock_irqrestore(&gpio->lock, flags);
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return 0;
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}
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static struct {
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char *name;
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int nr;
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int inv_dir;
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} clps711x_gpio_ports[] __initconst = {
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{ "PORTA", 8, 0, },
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{ "PORTB", 8, 0, },
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{ "PORTC", 8, 0, },
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{ "PORTD", 8, 1, },
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{ "PORTE", 3, 0, },
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};
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static int __init gpio_clps711x_init(void)
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{
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int i;
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struct platform_device *pdev;
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struct clps711x_gpio *gpio;
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pdev = platform_device_alloc(CLPS711X_GPIO_NAME, 0);
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if (!pdev) {
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pr_err("Cannot create platform device: %s\n",
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CLPS711X_GPIO_NAME);
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bgc = devm_kzalloc(&pdev->dev, sizeof(*bgc), GFP_KERNEL);
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if (!bgc)
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return -ENOMEM;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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dat = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(dat))
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return PTR_ERR(dat);
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res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
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dir = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(dir))
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return PTR_ERR(dir);
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switch (id) {
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case 3:
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/* PORTD is inverted logic for direction register */
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err = bgpio_init(bgc, &pdev->dev, 1, dat, NULL, NULL,
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NULL, dir, 0);
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break;
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default:
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err = bgpio_init(bgc, &pdev->dev, 1, dat, NULL, NULL,
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dir, NULL, 0);
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break;
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}
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platform_device_add(pdev);
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if (err)
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return err;
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gpio = devm_kzalloc(&pdev->dev, sizeof(struct clps711x_gpio),
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GFP_KERNEL);
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if (!gpio) {
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dev_err(&pdev->dev, "GPIO allocating memory error\n");
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platform_device_unregister(pdev);
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return -ENOMEM;
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switch (id) {
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case 4:
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/* PORTE is 3 lines only */
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bgc->gc.ngpio = 3;
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break;
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default:
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break;
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}
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platform_set_drvdata(pdev, gpio);
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bgc->gc.base = id * 8;
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platform_set_drvdata(pdev, bgc);
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spin_lock_init(&gpio->lock);
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for (i = 0; i < CLPS711X_GPIO_PORTS; i++) {
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gpio->chip[i].owner = THIS_MODULE;
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gpio->chip[i].dev = &pdev->dev;
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gpio->chip[i].label = clps711x_gpio_ports[i].name;
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gpio->chip[i].base = i * 8;
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gpio->chip[i].ngpio = clps711x_gpio_ports[i].nr;
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gpio->chip[i].get = gpio_clps711x_get;
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gpio->chip[i].set = gpio_clps711x_set;
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if (!clps711x_gpio_ports[i].inv_dir) {
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gpio->chip[i].direction_input = gpio_clps711x_dir_in;
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gpio->chip[i].direction_output = gpio_clps711x_dir_out;
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} else {
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gpio->chip[i].direction_input = gpio_clps711x_dir_in_inv;
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gpio->chip[i].direction_output = gpio_clps711x_dir_out_inv;
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}
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WARN_ON(gpiochip_add(&gpio->chip[i]));
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}
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dev_info(&pdev->dev, "GPIO driver initialized\n");
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return 0;
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return gpiochip_add(&bgc->gc);
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}
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arch_initcall(gpio_clps711x_init);
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MODULE_LICENSE("GPL v2");
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static int clps711x_gpio_remove(struct platform_device *pdev)
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{
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struct bgpio_chip *bgc = platform_get_drvdata(pdev);
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return bgpio_remove(bgc);
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}
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static struct platform_driver clps711x_gpio_driver = {
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.driver = {
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.name = "clps711x-gpio",
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.owner = THIS_MODULE,
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},
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.probe = clps711x_gpio_probe,
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.remove = clps711x_gpio_remove,
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};
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module_platform_driver(clps711x_gpio_driver);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
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MODULE_DESCRIPTION("CLPS711X GPIO driver");
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