summaryrefslogtreecommitdiff
path: root/drivers/gpio/gpio-sl28cpld.c
diff options
context:
space:
mode:
authorMichael Walle <michael@walle.cc>2020-09-14 23:43:35 +0200
committerLee Jones <lee.jones@linaro.org>2020-09-17 16:00:20 +0100
commitb7536d8749e54923c9a7e8c4175e1e4f9b8c1541 (patch)
tree0ba951b814a0138d7f4b64495815461a70579f1c /drivers/gpio/gpio-sl28cpld.c
parent9db33d221efcca9503ac481edcbf2b3f4404bdb8 (diff)
gpio: Add support for the sl28cpld GPIO controller
Add support for the GPIO controller of the sl28 board management controller. This driver is part of a multi-function device. A controller has 8 lines. There are three different flavors: full-featured GPIO with interrupt support, input-only and output-only. Signed-off-by: Michael Walle <michael@walle.cc> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>
Diffstat (limited to 'drivers/gpio/gpio-sl28cpld.c')
-rw-r--r--drivers/gpio/gpio-sl28cpld.c161
1 files changed, 161 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-sl28cpld.c b/drivers/gpio/gpio-sl28cpld.c
new file mode 100644
index 000000000000..889b8f5622c2
--- /dev/null
+++ b/drivers/gpio/gpio-sl28cpld.c
@@ -0,0 +1,161 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * sl28cpld GPIO driver
+ *
+ * Copyright 2020 Michael Walle <michael@walle.cc>
+ */
+
+#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 <michael@walle.cc>");
+MODULE_LICENSE("GPL");