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197 lines
5.0 KiB
197 lines
5.0 KiB
// 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 <[email protected]> |
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* Copyright (C) 2007-2010 Florian Fainelli <[email protected]> |
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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 <[email protected]>"); |
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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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