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161 lines
3.9 KiB
161 lines
3.9 KiB
// 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 <[email protected]> |
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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->mask_base = base + GPIO_REG_IE; |
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irq_chip->mask_invert = true; |
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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 <[email protected]>"); |
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MODULE_LICENSE("GPL");
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