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![Thomas Gleixner](/assets/img/avatar_default.png)
Based on 1 normalized pattern(s): 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 either version 2 of the license or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 675 mass ave cambridge ma 02139 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 441 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc) Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190520071858.739733335@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
197 lines
5 KiB
C
197 lines
5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* RDC321x GPIO driver
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*
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* Copyright (C) 2008, Volker Weiss <dev@tintuc.de>
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* Copyright (C) 2007-2010 Florian Fainelli <florian@openwrt.org>
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/spinlock.h>
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#include <linux/platform_device.h>
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#include <linux/pci.h>
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#include <linux/gpio/driver.h>
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#include <linux/mfd/rdc321x.h>
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#include <linux/slab.h>
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struct rdc321x_gpio {
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spinlock_t lock;
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struct pci_dev *sb_pdev;
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u32 data_reg[2];
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int reg1_ctrl_base;
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int reg1_data_base;
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int reg2_ctrl_base;
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int reg2_data_base;
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struct gpio_chip chip;
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};
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/* read GPIO pin */
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static int rdc_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
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{
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struct rdc321x_gpio *gpch;
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u32 value = 0;
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int reg;
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gpch = gpiochip_get_data(chip);
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reg = gpio < 32 ? gpch->reg1_data_base : gpch->reg2_data_base;
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spin_lock(&gpch->lock);
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pci_write_config_dword(gpch->sb_pdev, reg,
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gpch->data_reg[gpio < 32 ? 0 : 1]);
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pci_read_config_dword(gpch->sb_pdev, reg, &value);
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spin_unlock(&gpch->lock);
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return (1 << (gpio & 0x1f)) & value ? 1 : 0;
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}
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static void rdc_gpio_set_value_impl(struct gpio_chip *chip,
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unsigned gpio, int value)
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{
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struct rdc321x_gpio *gpch;
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int reg = (gpio < 32) ? 0 : 1;
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gpch = gpiochip_get_data(chip);
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if (value)
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gpch->data_reg[reg] |= 1 << (gpio & 0x1f);
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else
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gpch->data_reg[reg] &= ~(1 << (gpio & 0x1f));
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pci_write_config_dword(gpch->sb_pdev,
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reg ? gpch->reg2_data_base : gpch->reg1_data_base,
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gpch->data_reg[reg]);
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}
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/* set GPIO pin to value */
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static void rdc_gpio_set_value(struct gpio_chip *chip,
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unsigned gpio, int value)
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{
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struct rdc321x_gpio *gpch;
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gpch = gpiochip_get_data(chip);
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spin_lock(&gpch->lock);
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rdc_gpio_set_value_impl(chip, gpio, value);
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spin_unlock(&gpch->lock);
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}
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static int rdc_gpio_config(struct gpio_chip *chip,
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unsigned gpio, int value)
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{
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struct rdc321x_gpio *gpch;
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int err;
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u32 reg;
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gpch = gpiochip_get_data(chip);
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spin_lock(&gpch->lock);
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err = pci_read_config_dword(gpch->sb_pdev, gpio < 32 ?
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gpch->reg1_ctrl_base : gpch->reg2_ctrl_base, ®);
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if (err)
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goto unlock;
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reg |= 1 << (gpio & 0x1f);
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err = pci_write_config_dword(gpch->sb_pdev, gpio < 32 ?
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gpch->reg1_ctrl_base : gpch->reg2_ctrl_base, reg);
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if (err)
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goto unlock;
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rdc_gpio_set_value_impl(chip, gpio, value);
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unlock:
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spin_unlock(&gpch->lock);
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return err;
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}
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/* configure GPIO pin as input */
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static int rdc_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
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{
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return rdc_gpio_config(chip, gpio, 1);
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}
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/*
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* Cache the initial value of both GPIO data registers
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*/
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static int rdc321x_gpio_probe(struct platform_device *pdev)
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{
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int err;
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struct resource *r;
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struct rdc321x_gpio *rdc321x_gpio_dev;
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struct rdc321x_gpio_pdata *pdata;
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pdata = dev_get_platdata(&pdev->dev);
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if (!pdata) {
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dev_err(&pdev->dev, "no platform data supplied\n");
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return -ENODEV;
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}
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rdc321x_gpio_dev = devm_kzalloc(&pdev->dev, sizeof(struct rdc321x_gpio),
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GFP_KERNEL);
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if (!rdc321x_gpio_dev)
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return -ENOMEM;
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r = platform_get_resource_byname(pdev, IORESOURCE_IO, "gpio-reg1");
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if (!r) {
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dev_err(&pdev->dev, "failed to get gpio-reg1 resource\n");
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return -ENODEV;
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}
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spin_lock_init(&rdc321x_gpio_dev->lock);
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rdc321x_gpio_dev->sb_pdev = pdata->sb_pdev;
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rdc321x_gpio_dev->reg1_ctrl_base = r->start;
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rdc321x_gpio_dev->reg1_data_base = r->start + 0x4;
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r = platform_get_resource_byname(pdev, IORESOURCE_IO, "gpio-reg2");
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if (!r) {
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dev_err(&pdev->dev, "failed to get gpio-reg2 resource\n");
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return -ENODEV;
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}
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rdc321x_gpio_dev->reg2_ctrl_base = r->start;
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rdc321x_gpio_dev->reg2_data_base = r->start + 0x4;
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rdc321x_gpio_dev->chip.label = "rdc321x-gpio";
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rdc321x_gpio_dev->chip.owner = THIS_MODULE;
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rdc321x_gpio_dev->chip.direction_input = rdc_gpio_direction_input;
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rdc321x_gpio_dev->chip.direction_output = rdc_gpio_config;
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rdc321x_gpio_dev->chip.get = rdc_gpio_get_value;
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rdc321x_gpio_dev->chip.set = rdc_gpio_set_value;
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rdc321x_gpio_dev->chip.base = 0;
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rdc321x_gpio_dev->chip.ngpio = pdata->max_gpios;
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platform_set_drvdata(pdev, rdc321x_gpio_dev);
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/* This might not be, what others (BIOS, bootloader, etc.)
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wrote to these registers before, but it's a good guess. Still
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better than just using 0xffffffff. */
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err = pci_read_config_dword(rdc321x_gpio_dev->sb_pdev,
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rdc321x_gpio_dev->reg1_data_base,
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&rdc321x_gpio_dev->data_reg[0]);
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if (err)
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return err;
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err = pci_read_config_dword(rdc321x_gpio_dev->sb_pdev,
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rdc321x_gpio_dev->reg2_data_base,
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&rdc321x_gpio_dev->data_reg[1]);
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if (err)
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return err;
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dev_info(&pdev->dev, "registering %d GPIOs\n",
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rdc321x_gpio_dev->chip.ngpio);
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return devm_gpiochip_add_data(&pdev->dev, &rdc321x_gpio_dev->chip,
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rdc321x_gpio_dev);
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}
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static struct platform_driver rdc321x_gpio_driver = {
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.driver.name = "rdc321x-gpio",
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.probe = rdc321x_gpio_probe,
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};
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module_platform_driver(rdc321x_gpio_driver);
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MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
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MODULE_DESCRIPTION("RDC321x GPIO driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:rdc321x-gpio");
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