161 lines
3.9 KiB
C
161 lines
3.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* sl28cpld GPIO driver
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*
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* Copyright 2020 Michael Walle <michael@walle.cc>
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*/
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#include <linux/device.h>
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#include <linux/gpio/driver.h>
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#include <linux/gpio/regmap.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/mod_devicetable.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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/* GPIO flavor */
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#define GPIO_REG_DIR 0x00
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#define GPIO_REG_OUT 0x01
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#define GPIO_REG_IN 0x02
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#define GPIO_REG_IE 0x03
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#define GPIO_REG_IP 0x04
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/* input-only flavor */
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#define GPI_REG_IN 0x00
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/* output-only flavor */
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#define GPO_REG_OUT 0x00
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enum sl28cpld_gpio_type {
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SL28CPLD_GPIO = 1,
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SL28CPLD_GPI,
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SL28CPLD_GPO,
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};
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static const struct regmap_irq sl28cpld_gpio_irqs[] = {
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REGMAP_IRQ_REG_LINE(0, 8),
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REGMAP_IRQ_REG_LINE(1, 8),
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REGMAP_IRQ_REG_LINE(2, 8),
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REGMAP_IRQ_REG_LINE(3, 8),
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REGMAP_IRQ_REG_LINE(4, 8),
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REGMAP_IRQ_REG_LINE(5, 8),
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REGMAP_IRQ_REG_LINE(6, 8),
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REGMAP_IRQ_REG_LINE(7, 8),
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};
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static int sl28cpld_gpio_irq_init(struct platform_device *pdev,
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unsigned int base,
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struct gpio_regmap_config *config)
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{
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struct regmap_irq_chip_data *irq_data;
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struct regmap_irq_chip *irq_chip;
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struct device *dev = &pdev->dev;
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int irq, ret;
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if (!device_property_read_bool(dev, "interrupt-controller"))
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return 0;
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irq = platform_get_irq(pdev, 0);
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if (irq < 0)
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return irq;
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irq_chip = devm_kzalloc(dev, sizeof(*irq_chip), GFP_KERNEL);
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if (!irq_chip)
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return -ENOMEM;
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irq_chip->name = "sl28cpld-gpio-irq";
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irq_chip->irqs = sl28cpld_gpio_irqs;
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irq_chip->num_irqs = ARRAY_SIZE(sl28cpld_gpio_irqs);
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irq_chip->num_regs = 1;
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irq_chip->status_base = base + GPIO_REG_IP;
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irq_chip->unmask_base = base + GPIO_REG_IE;
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irq_chip->ack_base = base + GPIO_REG_IP;
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ret = devm_regmap_add_irq_chip_fwnode(dev, dev_fwnode(dev),
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config->regmap, irq,
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IRQF_SHARED | IRQF_ONESHOT,
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0, irq_chip, &irq_data);
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if (ret)
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return ret;
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config->irq_domain = regmap_irq_get_domain(irq_data);
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return 0;
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}
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static int sl28cpld_gpio_probe(struct platform_device *pdev)
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{
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struct gpio_regmap_config config = {0};
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enum sl28cpld_gpio_type type;
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struct regmap *regmap;
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u32 base;
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int ret;
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if (!pdev->dev.parent)
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return -ENODEV;
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type = (uintptr_t)device_get_match_data(&pdev->dev);
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if (!type)
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return -ENODEV;
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ret = device_property_read_u32(&pdev->dev, "reg", &base);
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if (ret)
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return -EINVAL;
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regmap = dev_get_regmap(pdev->dev.parent, NULL);
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if (!regmap)
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return -ENODEV;
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config.regmap = regmap;
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config.parent = &pdev->dev;
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config.ngpio = 8;
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switch (type) {
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case SL28CPLD_GPIO:
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config.reg_dat_base = base + GPIO_REG_IN;
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config.reg_set_base = base + GPIO_REG_OUT;
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/* reg_dir_out_base might be zero */
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config.reg_dir_out_base = GPIO_REGMAP_ADDR(base + GPIO_REG_DIR);
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/* This type supports interrupts */
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ret = sl28cpld_gpio_irq_init(pdev, base, &config);
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if (ret)
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return ret;
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break;
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case SL28CPLD_GPO:
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config.reg_set_base = base + GPO_REG_OUT;
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break;
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case SL28CPLD_GPI:
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config.reg_dat_base = base + GPI_REG_IN;
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break;
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default:
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dev_err(&pdev->dev, "unknown type %d\n", type);
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return -ENODEV;
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}
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return PTR_ERR_OR_ZERO(devm_gpio_regmap_register(&pdev->dev, &config));
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}
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static const struct of_device_id sl28cpld_gpio_of_match[] = {
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{ .compatible = "kontron,sl28cpld-gpio", .data = (void *)SL28CPLD_GPIO },
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{ .compatible = "kontron,sl28cpld-gpi", .data = (void *)SL28CPLD_GPI },
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{ .compatible = "kontron,sl28cpld-gpo", .data = (void *)SL28CPLD_GPO },
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{}
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};
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MODULE_DEVICE_TABLE(of, sl28cpld_gpio_of_match);
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static struct platform_driver sl28cpld_gpio_driver = {
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.probe = sl28cpld_gpio_probe,
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.driver = {
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.name = "sl28cpld-gpio",
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.of_match_table = sl28cpld_gpio_of_match,
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},
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};
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module_platform_driver(sl28cpld_gpio_driver);
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MODULE_DESCRIPTION("sl28cpld GPIO Driver");
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MODULE_AUTHOR("Michael Walle <michael@walle.cc>");
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MODULE_LICENSE("GPL");
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