@@ -1722,6 +1722,7 @@ F: Documentation/devicetree/bindings/interrupt-controller/apple,aic.yaml
F: Documentation/devicetree/bindings/pinctrl/apple,pinctrl.yaml
F: arch/arm64/boot/dts/apple/
F: drivers/irqchip/irq-apple-aic.c
+F: drivers/pinctrl/pinctrl-apple-gpio.c
F: include/dt-bindings/interrupt-controller/apple-aic.h
F: include/dt-bindings/pinctrl/apple.h
@@ -31,6 +31,22 @@ config DEBUG_PINCTRL
help
Say Y here to add some extra checks and diagnostics to PINCTRL calls.
+config PINCTRL_APPLE_GPIO
+ tristate "Apple SoC GPIO pin controller driver"
+ depends on ARCH_APPLE
+ select PINMUX
+ select GPIOLIB
+ select GPIOLIB_IRQCHIP
+ select GENERIC_PINCTRL_GROUPS
+ select GENERIC_PINMUX_FUNCTIONS
+ select OF_GPIO
+ help
+ This is the driver for the GPIO controller found on Apple ARM SoCs,
+ including M1.
+
+ This driver can also be built as a module. If so, the module
+ will be called pinctrl-apple-gpio.
+
config PINCTRL_ARTPEC6
bool "Axis ARTPEC-6 pin controller driver"
depends on MACH_ARTPEC6
@@ -8,6 +8,7 @@ obj-$(CONFIG_PINMUX) += pinmux.o
obj-$(CONFIG_PINCONF) += pinconf.o
obj-$(CONFIG_OF) += devicetree.o
obj-$(CONFIG_GENERIC_PINCONF) += pinconf-generic.o
+obj-$(CONFIG_PINCTRL_APPLE_GPIO) += pinctrl-apple-gpio.o
obj-$(CONFIG_PINCTRL_ARTPEC6) += pinctrl-artpec6.o
obj-$(CONFIG_PINCTRL_AS3722) += pinctrl-as3722.o
obj-$(CONFIG_PINCTRL_AXP209) += pinctrl-axp209.o
new file mode 100644
@@ -0,0 +1,561 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Apple SoC pinctrl+GPIO+external IRQ driver
+ *
+ * Copyright (C) 2021 The Asahi Linux Contributors
+ * Copyright (C) 2020 Corellium LLC
+ *
+ * Based on: pinctrl-pistachio.c
+ * Copyright (C) 2014 Imagination Technologies Ltd.
+ * Copyright (C) 2014 Google, Inc.
+ */
+
+#include <dt-bindings/pinctrl/apple.h>
+#include <linux/clk.h>
+#include <linux/gpio/driver.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/platform_device.h>
+
+#include "pinctrl-utils.h"
+#include "core.h"
+#include "pinmux.h"
+
+struct apple_gpio_irq_data {
+ struct apple_gpio_pinctrl *pctl;
+ int irqgrp;
+};
+
+struct apple_gpio_pinctrl {
+ struct device *dev;
+ struct pinctrl_dev *pctldev;
+
+ // Shadow the pin values, the REG_GPIOx_DATA bit can read back stale values.
+ u32 *pin_shadow;
+
+ void __iomem *base;
+ unsigned int nirqgrps;
+
+ struct pinctrl_desc pinctrl_desc;
+ struct gpio_chip gpio_chip;
+ struct irq_chip irq_chip;
+};
+
+#define REG_GPIO(x) (4 * (x))
+#define REG_GPIOx_DATA BIT(0)
+#define REG_GPIOx_MODE_MASK GENMASK(3, 1)
+#define REG_GPIOx_OUT 1
+#define REG_GPIOx_IN_IRQ_HI 2
+#define REG_GPIOx_IN_IRQ_LO 3
+#define REG_GPIOx_IN_IRQ_UP 4
+#define REG_GPIOx_IN_IRQ_DN 5
+#define REG_GPIOx_IN_IRQ_ANY 6
+#define REG_GPIOx_IN_IRQ_OFF 7
+#define REG_GPIOx_PERIPH BIT(5)
+#define REG_GPIOx_CFG_DONE BIT(9)
+#define REG_GPIOx_GRP_MASK GENMASK(18, 16)
+#define REG_IRQ(g, x) (0x800 + 0x40 * (g) + 4 * ((x) >> 5))
+
+// No locking needed to mask/unmask IRQs as the interrupt mode is per pin-register.
+static void apple_gpio_set_reg(struct apple_gpio_pinctrl *pctl,
+ unsigned int pin, uint32_t clr, uint32_t set)
+{
+ void __iomem *ppin = pctl->base + REG_GPIO(pin);
+ uint32_t prev, cfg;
+
+ prev = pctl->pin_shadow[pin];
+ cfg = (prev & ~clr) | set;
+
+ if (!(prev & REG_GPIOx_CFG_DONE))
+ writel_relaxed(cfg & ~REG_GPIOx_CFG_DONE, ppin);
+ writel_relaxed(cfg, ppin);
+ pctl->pin_shadow[pin] = cfg;
+}
+
+static uint32_t apple_gpio_get_reg(struct apple_gpio_pinctrl *pctl,
+ unsigned int pin)
+{
+ return readl_relaxed(pctl->base + REG_GPIO(pin));
+}
+
+/* Pin controller functions */
+
+static int apple_gpio_dt_node_to_map(struct pinctrl_dev *pctldev,
+ struct device_node *node,
+ struct pinctrl_map **map,
+ unsigned *num_maps)
+{
+ unsigned reserved_maps;
+ struct apple_gpio_pinctrl *pctl;
+ u32 pinfunc, pin, func;
+ int num_pins, i, ret;
+ const char *group_name;
+ const char *function_name;
+
+ *map = NULL;
+ *num_maps = 0;
+ reserved_maps = 0;
+
+ pctl = pinctrl_dev_get_drvdata(pctldev);
+
+ ret = of_property_count_u32_elems(node, "pinmux");
+ if (ret <= 0) {
+ dev_err(pctl->dev,
+ "missing or empty pinmux property in node %pOFn.\n",
+ node);
+ return -EINVAL;
+ }
+
+ num_pins = ret;
+
+ ret = pinctrl_utils_reserve_map(pctldev, map, &reserved_maps, num_maps,
+ num_pins);
+ if (ret)
+ return ret;
+
+ for (i = 0; i < num_pins; i++) {
+ ret = of_property_read_u32_index(node, "pinmux", i, &pinfunc);
+ if (ret)
+ goto free_map;
+
+ pin = APPLE_PIN(pinfunc);
+ func = APPLE_FUNC(pinfunc);
+
+ if (func >= pinmux_generic_get_function_count(pctldev)) {
+ ret = -EINVAL;
+ goto free_map;
+ }
+
+ group_name = pinctrl_generic_get_group_name(pctldev, pin);
+ function_name =
+ pinmux_generic_get_function_name(pctl->pctldev, func);
+ ret = pinctrl_utils_add_map_mux(pctl->pctldev, map,
+ &reserved_maps, num_maps,
+ group_name, function_name);
+ if (ret)
+ goto free_map;
+ }
+
+free_map:
+ if (ret < 0) {
+ pinctrl_utils_free_map(pctldev, *map, *num_maps);
+ return ret;
+ }
+
+ return 0;
+}
+
+static const struct pinctrl_ops apple_gpio_pinctrl_ops = {
+ .get_groups_count = pinctrl_generic_get_group_count,
+ .get_group_name = pinctrl_generic_get_group_name,
+ .get_group_pins = pinctrl_generic_get_group_pins,
+ .dt_node_to_map = apple_gpio_dt_node_to_map,
+ .dt_free_map = pinctrl_utils_free_map,
+};
+
+/* Pin multiplexer functions */
+
+static int apple_gpio_pinmux_enable(struct pinctrl_dev *pctldev, unsigned func,
+ unsigned group)
+{
+ struct apple_gpio_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
+
+ if (func)
+ apple_gpio_set_reg(pctl, group, 0,
+ REG_GPIOx_PERIPH | REG_GPIOx_CFG_DONE);
+ else
+ apple_gpio_set_reg(pctl, group, REG_GPIOx_PERIPH,
+ REG_GPIOx_CFG_DONE);
+
+ return 0;
+}
+
+static const struct pinmux_ops apple_gpio_pinmux_ops = {
+ .get_functions_count = pinmux_generic_get_function_count,
+ .get_function_name = pinmux_generic_get_function_name,
+ .get_function_groups = pinmux_generic_get_function_groups,
+ .set_mux = apple_gpio_pinmux_enable,
+ .strict = true,
+};
+
+/* GPIO chip functions */
+
+static int apple_gpio_gpio_get_direction(struct gpio_chip *chip,
+ unsigned int offset)
+{
+ struct apple_gpio_pinctrl *pctl = gpiochip_get_data(chip);
+
+ return (FIELD_GET(REG_GPIOx_MODE_MASK, pctl->pin_shadow[offset]) ==
+ REG_GPIOx_OUT) ?
+ GPIO_LINE_DIRECTION_OUT :
+ GPIO_LINE_DIRECTION_IN;
+}
+
+static int apple_gpio_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+ struct apple_gpio_pinctrl *pctl = gpiochip_get_data(chip);
+ uint32_t reg;
+
+ if (FIELD_GET(REG_GPIOx_MODE_MASK, pctl->pin_shadow[offset]) ==
+ REG_GPIOx_OUT) {
+ return pctl->pin_shadow[offset] & REG_GPIOx_DATA;
+ }
+
+ reg = apple_gpio_get_reg(pctl, offset);
+ return !!(reg & REG_GPIOx_DATA);
+}
+
+static void apple_gpio_gpio_set(struct gpio_chip *chip, unsigned int offset,
+ int value)
+{
+ struct apple_gpio_pinctrl *pctl = gpiochip_get_data(chip);
+
+ apple_gpio_set_reg(pctl, offset, REG_GPIOx_DATA,
+ REG_GPIOx_CFG_DONE | (value & REG_GPIOx_DATA));
+}
+
+static int apple_gpio_gpio_direction_input(struct gpio_chip *chip,
+ unsigned int offset)
+{
+ struct apple_gpio_pinctrl *pctl = gpiochip_get_data(chip);
+
+ apple_gpio_set_reg(pctl, offset, REG_GPIOx_MODE_MASK | REG_GPIOx_DATA,
+ FIELD_PREP(REG_GPIOx_MODE_MASK,
+ REG_GPIOx_IN_IRQ_OFF) |
+ REG_GPIOx_CFG_DONE);
+ return 0;
+}
+
+static int apple_gpio_gpio_direction_output(struct gpio_chip *chip,
+ unsigned int offset, int value)
+{
+ struct apple_gpio_pinctrl *pctl = gpiochip_get_data(chip);
+
+ apple_gpio_set_reg(pctl, offset, REG_GPIOx_PERIPH | REG_GPIOx_DATA,
+ FIELD_PREP(REG_GPIOx_MODE_MASK, REG_GPIOx_OUT) |
+ (value & REG_GPIOx_DATA) |
+ REG_GPIOx_CFG_DONE);
+ return 0;
+}
+
+/* IRQ chip functions */
+
+static void apple_gpio_gpio_irq_ack(struct irq_data *data)
+{
+ struct apple_gpio_pinctrl *pctl =
+ gpiochip_get_data(irq_data_get_irq_chip_data(data));
+ unsigned int irqgrp = FIELD_GET(REG_GPIOx_GRP_MASK,
+ apple_gpio_get_reg(pctl, data->hwirq));
+
+ writel(BIT(data->hwirq & 31),
+ pctl->base + REG_IRQ(irqgrp, data->hwirq));
+}
+
+static int apple_gpio_irq_type(unsigned int type)
+{
+ switch (type & IRQ_TYPE_SENSE_MASK) {
+ case IRQ_TYPE_EDGE_RISING:
+ return REG_GPIOx_IN_IRQ_UP;
+ case IRQ_TYPE_EDGE_FALLING:
+ return REG_GPIOx_IN_IRQ_DN;
+ case IRQ_TYPE_EDGE_BOTH:
+ return REG_GPIOx_IN_IRQ_ANY;
+ case IRQ_TYPE_LEVEL_HIGH:
+ return REG_GPIOx_IN_IRQ_HI;
+ case IRQ_TYPE_LEVEL_LOW:
+ return REG_GPIOx_IN_IRQ_LO;
+ default:
+ return -EINVAL;
+ }
+}
+
+static void apple_gpio_gpio_irq_mask(struct irq_data *data)
+{
+ struct apple_gpio_pinctrl *pctl =
+ gpiochip_get_data(irq_data_get_irq_chip_data(data));
+ apple_gpio_set_reg(pctl, data->hwirq, REG_GPIOx_MODE_MASK,
+ FIELD_PREP(REG_GPIOx_MODE_MASK,
+ REG_GPIOx_IN_IRQ_OFF) |
+ REG_GPIOx_CFG_DONE);
+}
+
+static void apple_gpio_gpio_irq_unmask(struct irq_data *data)
+{
+ struct apple_gpio_pinctrl *pctl =
+ gpiochip_get_data(irq_data_get_irq_chip_data(data));
+ u32 irqtype = apple_gpio_irq_type(irqd_get_trigger_type(data));
+
+ if (WARN_ON(irqtype < 0))
+ return;
+ apple_gpio_set_reg(pctl, data->hwirq, REG_GPIOx_MODE_MASK,
+ FIELD_PREP(REG_GPIOx_MODE_MASK, irqtype) |
+ REG_GPIOx_CFG_DONE);
+}
+
+static unsigned int apple_gpio_gpio_irq_startup(struct irq_data *data)
+{
+ struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
+ struct apple_gpio_pinctrl *pctl = gpiochip_get_data(chip);
+
+ apple_gpio_set_reg(pctl, data->hwirq, REG_GPIOx_GRP_MASK,
+ FIELD_PREP(REG_GPIOx_GRP_MASK, 0));
+
+ apple_gpio_gpio_direction_input(chip, data->hwirq);
+ apple_gpio_gpio_irq_unmask(data);
+
+ return 0;
+}
+
+static int apple_gpio_gpio_irq_set_type(struct irq_data *data,
+ unsigned int type)
+{
+ struct apple_gpio_pinctrl *pctl =
+ gpiochip_get_data(irq_data_get_irq_chip_data(data));
+ u32 irqtype = apple_gpio_irq_type(type);
+
+ if (irqtype < 0)
+ return irqtype;
+
+ irqd_set_trigger_type(data, type);
+
+ apple_gpio_set_reg(pctl, data->hwirq, REG_GPIOx_MODE_MASK,
+ FIELD_PREP(REG_GPIOx_MODE_MASK, irqtype) |
+ REG_GPIOx_CFG_DONE);
+
+ if (type & IRQ_TYPE_LEVEL_MASK)
+ irq_set_handler_locked(data, handle_level_irq);
+ else
+ irq_set_handler_locked(data, handle_edge_irq);
+ return 0;
+}
+
+static void apple_gpio_gpio_irq_handler(struct irq_desc *desc)
+{
+ struct apple_gpio_irq_data *data = irq_desc_get_handler_data(desc);
+ struct apple_gpio_pinctrl *pctl = data->pctl;
+ struct gpio_chip *gc = &pctl->gpio_chip;
+ struct irq_chip *chip = irq_desc_get_chip(desc);
+ unsigned int irqgrp = data->irqgrp;
+ unsigned int pinh, pinl;
+ unsigned long pending;
+
+ chained_irq_enter(chip, desc);
+ for (pinh = 0; pinh < gc->ngpio; pinh += 32) {
+ pending = readl(pctl->base + REG_IRQ(irqgrp, pinh));
+ for_each_set_bit(pinl, &pending, 32)
+ generic_handle_domain_irq(gc->irq.domain, pinh + pinl);
+ }
+ chained_irq_exit(chip, desc);
+}
+
+/* Probe & register */
+
+static int apple_gpio_gpio_register(struct apple_gpio_pinctrl *pctl)
+{
+ struct device_node *node = pctl->dev->of_node;
+ struct gpio_irq_chip *girq;
+ struct apple_gpio_irq_data **irq_data;
+ int i;
+ int ret;
+
+ if (!of_find_property(node, "gpio-controller", NULL)) {
+ dev_err(pctl->dev,
+ "Apple GPIO must have 'gpio-controller' property.\n");
+ return -ENODEV;
+ }
+
+ pctl->gpio_chip.label = dev_name(pctl->dev);
+ pctl->gpio_chip.request = gpiochip_generic_request;
+ pctl->gpio_chip.free = gpiochip_generic_free;
+ pctl->gpio_chip.get_direction = apple_gpio_gpio_get_direction;
+ pctl->gpio_chip.direction_input = apple_gpio_gpio_direction_input;
+ pctl->gpio_chip.direction_output = apple_gpio_gpio_direction_output;
+ pctl->gpio_chip.get = apple_gpio_gpio_get;
+ pctl->gpio_chip.set = apple_gpio_gpio_set;
+ pctl->gpio_chip.base = -1;
+ pctl->gpio_chip.ngpio = pctl->pinctrl_desc.npins;
+ pctl->gpio_chip.parent = pctl->dev;
+ pctl->gpio_chip.of_node = node;
+
+ if (of_property_read_bool(node, "interrupt-controller")) {
+ ret = platform_irq_count(to_platform_device(pctl->dev));
+ if (ret < 0)
+ return ret;
+
+ pctl->nirqgrps = ret;
+
+ pctl->irq_chip.name = "Apple-GPIO";
+ pctl->irq_chip.irq_startup = apple_gpio_gpio_irq_startup;
+ pctl->irq_chip.irq_ack = apple_gpio_gpio_irq_ack;
+ pctl->irq_chip.irq_mask = apple_gpio_gpio_irq_mask;
+ pctl->irq_chip.irq_unmask = apple_gpio_gpio_irq_unmask;
+ pctl->irq_chip.irq_set_type = apple_gpio_gpio_irq_set_type;
+
+ girq = &pctl->gpio_chip.irq;
+ girq->chip = &pctl->irq_chip;
+ girq->parent_handler = apple_gpio_gpio_irq_handler;
+ girq->num_parents = pctl->nirqgrps;
+
+ girq->parents = kmalloc_array(
+ pctl->nirqgrps, sizeof(*girq->parents), GFP_KERNEL);
+ if (!girq->parents)
+ return -ENOMEM;
+
+ for (i = 0; i < pctl->nirqgrps; i++) {
+ ret = platform_get_irq(to_platform_device(pctl->dev),
+ i);
+ if (ret < 0) {
+ return dev_err_probe(pctl->dev, ret,
+ "Failed to map IRQ %d\n",
+ i);
+ }
+ girq->parents[i] = ret;
+ }
+
+ irq_data = kmalloc_array(pctl->nirqgrps, sizeof(*irq_data),
+ GFP_KERNEL);
+ if (!irq_data) {
+ kfree(girq->parents);
+ return -ENOMEM;
+ }
+ for (i = 0; i < pctl->nirqgrps; i++) {
+ irq_data[i] = devm_kzalloc(
+ pctl->dev, sizeof(*irq_data[i]), GFP_KERNEL);
+ irq_data[i]->pctl = pctl;
+ irq_data[i]->irqgrp = i;
+ }
+
+ girq->parent_handler_data_array = (void **)irq_data;
+ girq->per_parent_data = true;
+ girq->default_type = IRQ_TYPE_NONE;
+ girq->handler = handle_level_irq;
+ }
+
+ ret = devm_gpiochip_add_data(pctl->dev, &pctl->gpio_chip, pctl);
+
+ if (of_property_read_bool(node, "interrupt-controller")) {
+ kfree(girq->parents);
+ kfree(irq_data);
+ }
+
+ return ret;
+}
+
+static int apple_gpio_pinctrl_probe(struct platform_device *pdev)
+{
+ struct apple_gpio_pinctrl *pctl;
+ struct pinctrl_pin_desc *pins;
+ unsigned int npins;
+ const char **pin_names;
+ unsigned int *pin_nums;
+ unsigned int i, reg;
+ int res;
+
+ pctl = devm_kzalloc(&pdev->dev, sizeof(*pctl), GFP_KERNEL);
+ if (!pctl)
+ return -ENOMEM;
+ pctl->dev = &pdev->dev;
+ dev_set_drvdata(&pdev->dev, pctl);
+
+ if (of_property_read_u32(pdev->dev.of_node, "apple,npins", &npins)) {
+ dev_err(&pdev->dev, "gpio-ranges property not found\n");
+ npins = 512;
+ return -EINVAL;
+ }
+
+ pins = devm_kmalloc_array(&pdev->dev, npins, sizeof(pins[0]),
+ GFP_KERNEL);
+ if (!pins)
+ return -ENOMEM;
+ pin_names = devm_kmalloc_array(&pdev->dev, npins, sizeof(pin_names[0]),
+ GFP_KERNEL);
+ if (!pin_names)
+ return -ENOMEM;
+ pin_nums = devm_kmalloc_array(&pdev->dev, npins, sizeof(pin_nums[0]),
+ GFP_KERNEL);
+ if (!pin_nums)
+ return -ENOMEM;
+ pctl->pin_shadow = devm_kmalloc_array(
+ &pdev->dev, npins, sizeof(pctl->pin_shadow[0]), GFP_KERNEL);
+ if (!pctl->pin_shadow)
+ return -ENOMEM;
+
+ pctl->base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(pctl->base))
+ return PTR_ERR(pctl->base);
+
+ for (i = 0; i < npins; i++) {
+ reg = apple_gpio_get_reg(pctl, i);
+ pctl->pin_shadow[i] = reg;
+ pins[i].number = i;
+ pins[i].name =
+ devm_kasprintf(&pdev->dev, GFP_KERNEL, "PIN%u", i);
+ pins[i].drv_data = pctl;
+ pin_names[i] = pins[i].name;
+ pin_nums[i] = i;
+ }
+
+ pctl->pinctrl_desc.name = dev_name(pctl->dev);
+ pctl->pinctrl_desc.pins = pins;
+ pctl->pinctrl_desc.npins = npins;
+ pctl->pinctrl_desc.pctlops = &apple_gpio_pinctrl_ops;
+ pctl->pinctrl_desc.pmxops = &apple_gpio_pinmux_ops;
+
+ pctl->pctldev =
+ devm_pinctrl_register(&pdev->dev, &pctl->pinctrl_desc, pctl);
+ if (IS_ERR(pctl->pctldev)) {
+ dev_err(&pdev->dev, "Failed to register pinctrl device.\n");
+ return PTR_ERR(pctl->pctldev);
+ }
+
+ for (i = 0; i < npins; i++) {
+ res = pinctrl_generic_add_group(pctl->pctldev, pins[i].name,
+ pin_nums + i, 1, pctl);
+ if (res < 0) {
+ dev_err(pctl->dev, "Failed to register group.");
+ return res;
+ }
+ }
+
+ res = pinmux_generic_add_function(pctl->pctldev, "gpio", pin_names,
+ npins, pctl);
+ if (res < 0) {
+ dev_err(pctl->dev, "Failed to register function.");
+ return res;
+ }
+
+ res = pinmux_generic_add_function(pctl->pctldev, "periph", pin_names,
+ npins, pctl);
+ if (res < 0) {
+ dev_err(pctl->dev, "Failed to register function.");
+ return res;
+ }
+
+ return apple_gpio_gpio_register(pctl);
+}
+
+static const struct of_device_id apple_gpio_pinctrl_of_match[] = {
+ { .compatible = "apple,t8103-pinctrl", },
+ { .compatible = "apple,pinctrl", },
+ { }
+};
+
+static struct platform_driver apple_gpio_pinctrl_driver = {
+ .driver = {
+ .name = "apple-gpio-pinctrl",
+ .of_match_table = apple_gpio_pinctrl_of_match,
+ .suppress_bind_attrs = true,
+ },
+ .probe = apple_gpio_pinctrl_probe,
+};
+module_platform_driver(apple_gpio_pinctrl_driver);
+
+MODULE_DESCRIPTION("Apple pinctrl/GPIO driver");
+MODULE_AUTHOR("Stan Skowronek <stan@corellium.com>");
+MODULE_AUTHOR("Joey Gouly <joey.gouly@arm.com>");
+MODULE_LICENSE("GPL v2");