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