1 files changed, 492 insertions, 0 deletions
diff --git a/drivers/pinctrl/pinctrl-rk805.c b/drivers/pinctrl/pinctrl-rk805.c
new file mode 100644
index 000000000..c6f4229eb
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-rk805.c
@@ -0,0 +1,492 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Pinctrl driver for Rockchip RK805 PMIC
+ *
+ * Copyright (c) 2017, Fuzhou Rockchip Electronics Co., Ltd
+ *
+ * Author: Joseph Chen <chenjh@rock-chips.com>
+ *
+ * Based on the pinctrl-as3722 driver
+ */
+
+#include <linux/gpio/driver.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mfd/rk808.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/pinctrl/machine.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinconf-generic.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/pm.h>
+#include <linux/slab.h>
+
+#include "core.h"
+#include "pinconf.h"
+#include "pinctrl-utils.h"
+
+struct rk805_pin_function {
+	const char *name;
+	const char *const *groups;
+	unsigned int ngroups;
+	int mux_option;
+};
+
+struct rk805_pin_group {
+	const char *name;
+	const unsigned int pins[1];
+	unsigned int npins;
+};
+
+/*
+ * @reg: gpio setting register;
+ * @fun_mask: functions select mask value, when set is gpio;
+ * @dir_mask: input or output mask value, when set is output, otherwise input;
+ * @val_mask: gpio set value, when set is level high, otherwise low;
+ *
+ * Different PMIC has different pin features, belowing 3 mask members are not
+ * all necessary for every PMIC. For example, RK805 has 2 pins that can be used
+ * as output only GPIOs, so func_mask and dir_mask are not needed. RK816 has 1
+ * pin that can be used as TS/GPIO, so fun_mask, dir_mask and val_mask are all
+ * necessary.
+ */
+struct rk805_pin_config {
+	u8 reg;
+	u8 fun_msk;
+	u8 dir_msk;
+	u8 val_msk;
+};
+
+struct rk805_pctrl_info {
+	struct rk808 *rk808;
+	struct device *dev;
+	struct pinctrl_dev *pctl;
+	struct gpio_chip gpio_chip;
+	struct pinctrl_desc pinctrl_desc;
+	const struct rk805_pin_function *functions;
+	unsigned int num_functions;
+	const struct rk805_pin_group *groups;
+	int num_pin_groups;
+	const struct pinctrl_pin_desc *pins;
+	unsigned int num_pins;
+	const struct rk805_pin_config *pin_cfg;
+};
+
+enum rk805_pinmux_option {
+	RK805_PINMUX_GPIO,
+};
+
+enum {
+	RK805_GPIO0,
+	RK805_GPIO1,
+};
+
+static const char *const rk805_gpio_groups[] = {
+	"gpio0",
+	"gpio1",
+};
+
+/* RK805: 2 output only GPIOs */
+static const struct pinctrl_pin_desc rk805_pins_desc[] = {
+	PINCTRL_PIN(RK805_GPIO0, "gpio0"),
+	PINCTRL_PIN(RK805_GPIO1, "gpio1"),
+};
+
+static const struct rk805_pin_function rk805_pin_functions[] = {
+	{
+		.name = "gpio",
+		.groups = rk805_gpio_groups,
+		.ngroups = ARRAY_SIZE(rk805_gpio_groups),
+		.mux_option = RK805_PINMUX_GPIO,
+	},
+};
+
+static const struct rk805_pin_group rk805_pin_groups[] = {
+	{
+		.name = "gpio0",
+		.pins = { RK805_GPIO0 },
+		.npins = 1,
+	},
+	{
+		.name = "gpio1",
+		.pins = { RK805_GPIO1 },
+		.npins = 1,
+	},
+};
+
+#define RK805_GPIO0_VAL_MSK	BIT(0)
+#define RK805_GPIO1_VAL_MSK	BIT(1)
+
+static const struct rk805_pin_config rk805_gpio_cfgs[] = {
+	{
+		.reg = RK805_OUT_REG,
+		.val_msk = RK805_GPIO0_VAL_MSK,
+	},
+	{
+		.reg = RK805_OUT_REG,
+		.val_msk = RK805_GPIO1_VAL_MSK,
+	},
+};
+
+/* generic gpio chip */
+static int rk805_gpio_get(struct gpio_chip *chip, unsigned int offset)
+{
+	struct rk805_pctrl_info *pci = gpiochip_get_data(chip);
+	int ret, val;
+
+	ret = regmap_read(pci->rk808->regmap, pci->pin_cfg[offset].reg, &val);
+	if (ret) {
+		dev_err(pci->dev, "get gpio%d value failed\n", offset);
+		return ret;
+	}
+
+	return !!(val & pci->pin_cfg[offset].val_msk);
+}
+
+static void rk805_gpio_set(struct gpio_chip *chip,
+			   unsigned int offset,
+			   int value)
+{
+	struct rk805_pctrl_info *pci = gpiochip_get_data(chip);
+	int ret;
+
+	ret = regmap_update_bits(pci->rk808->regmap,
+				 pci->pin_cfg[offset].reg,
+				 pci->pin_cfg[offset].val_msk,
+				 value ? pci->pin_cfg[offset].val_msk : 0);
+	if (ret)
+		dev_err(pci->dev, "set gpio%d value %d failed\n",
+			offset, value);
+}
+
+static int rk805_gpio_direction_input(struct gpio_chip *chip,
+				      unsigned int offset)
+{
+	return pinctrl_gpio_direction_input(chip->base + offset);
+}
+
+static int rk805_gpio_direction_output(struct gpio_chip *chip,
+				       unsigned int offset, int value)
+{
+	rk805_gpio_set(chip, offset, value);
+	return pinctrl_gpio_direction_output(chip->base + offset);
+}
+
+static int rk805_gpio_get_direction(struct gpio_chip *chip, unsigned int offset)
+{
+	struct rk805_pctrl_info *pci = gpiochip_get_data(chip);
+	unsigned int val;
+	int ret;
+
+	/* default output*/
+	if (!pci->pin_cfg[offset].dir_msk)
+		return GPIO_LINE_DIRECTION_OUT;
+
+	ret = regmap_read(pci->rk808->regmap,
+			  pci->pin_cfg[offset].reg,
+			  &val);
+	if (ret) {
+		dev_err(pci->dev, "get gpio%d direction failed\n", offset);
+		return ret;
+	}
+
+	if (val & pci->pin_cfg[offset].dir_msk)
+		return GPIO_LINE_DIRECTION_OUT;
+
+	return GPIO_LINE_DIRECTION_IN;
+}
+
+static const struct gpio_chip rk805_gpio_chip = {
+	.label			= "rk805-gpio",
+	.request		= gpiochip_generic_request,
+	.free			= gpiochip_generic_free,
+	.get_direction		= rk805_gpio_get_direction,
+	.get			= rk805_gpio_get,
+	.set			= rk805_gpio_set,
+	.direction_input	= rk805_gpio_direction_input,
+	.direction_output	= rk805_gpio_direction_output,
+	.can_sleep		= true,
+	.base			= -1,
+	.owner			= THIS_MODULE,
+};
+
+/* generic pinctrl */
+static int rk805_pinctrl_get_groups_count(struct pinctrl_dev *pctldev)
+{
+	struct rk805_pctrl_info *pci = pinctrl_dev_get_drvdata(pctldev);
+
+	return pci->num_pin_groups;
+}
+
+static const char *rk805_pinctrl_get_group_name(struct pinctrl_dev *pctldev,
+						unsigned int group)
+{
+	struct rk805_pctrl_info *pci = pinctrl_dev_get_drvdata(pctldev);
+
+	return pci->groups[group].name;
+}
+
+static int rk805_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
+					unsigned int group,
+					const unsigned int **pins,
+					unsigned int *num_pins)
+{
+	struct rk805_pctrl_info *pci = pinctrl_dev_get_drvdata(pctldev);
+
+	*pins = pci->groups[group].pins;
+	*num_pins = pci->groups[group].npins;
+
+	return 0;
+}
+
+static const struct pinctrl_ops rk805_pinctrl_ops = {
+	.get_groups_count = rk805_pinctrl_get_groups_count,
+	.get_group_name = rk805_pinctrl_get_group_name,
+	.get_group_pins = rk805_pinctrl_get_group_pins,
+	.dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
+	.dt_free_map = pinctrl_utils_free_map,
+};
+
+static int rk805_pinctrl_get_funcs_count(struct pinctrl_dev *pctldev)
+{
+	struct rk805_pctrl_info *pci = pinctrl_dev_get_drvdata(pctldev);
+
+	return pci->num_functions;
+}
+
+static const char *rk805_pinctrl_get_func_name(struct pinctrl_dev *pctldev,
+					       unsigned int function)
+{
+	struct rk805_pctrl_info *pci = pinctrl_dev_get_drvdata(pctldev);
+
+	return pci->functions[function].name;
+}
+
+static int rk805_pinctrl_get_func_groups(struct pinctrl_dev *pctldev,
+					 unsigned int function,
+					 const char *const **groups,
+					 unsigned int *const num_groups)
+{
+	struct rk805_pctrl_info *pci = pinctrl_dev_get_drvdata(pctldev);
+
+	*groups = pci->functions[function].groups;
+	*num_groups = pci->functions[function].ngroups;
+
+	return 0;
+}
+
+static int _rk805_pinctrl_set_mux(struct pinctrl_dev *pctldev,
+				  unsigned int offset,
+				  int mux)
+{
+	struct rk805_pctrl_info *pci = pinctrl_dev_get_drvdata(pctldev);
+	int ret;
+
+	if (!pci->pin_cfg[offset].fun_msk)
+		return 0;
+
+	if (mux == RK805_PINMUX_GPIO) {
+		ret = regmap_update_bits(pci->rk808->regmap,
+					 pci->pin_cfg[offset].reg,
+					 pci->pin_cfg[offset].fun_msk,
+					 pci->pin_cfg[offset].fun_msk);
+		if (ret) {
+			dev_err(pci->dev, "set gpio%d GPIO failed\n", offset);
+			return ret;
+		}
+	} else {
+		dev_err(pci->dev, "Couldn't find function mux %d\n", mux);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int rk805_pinctrl_set_mux(struct pinctrl_dev *pctldev,
+				 unsigned int function,
+				 unsigned int group)
+{
+	struct rk805_pctrl_info *pci = pinctrl_dev_get_drvdata(pctldev);
+	int mux = pci->functions[function].mux_option;
+	int offset = group;
+
+	return _rk805_pinctrl_set_mux(pctldev, offset, mux);
+}
+
+static int rk805_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
+					struct pinctrl_gpio_range *range,
+					unsigned int offset, bool input)
+{
+	struct rk805_pctrl_info *pci = pinctrl_dev_get_drvdata(pctldev);
+	int ret;
+
+	/* switch to gpio function */
+	ret = _rk805_pinctrl_set_mux(pctldev, offset, RK805_PINMUX_GPIO);
+	if (ret) {
+		dev_err(pci->dev, "set gpio%d mux failed\n", offset);
+		return ret;
+	}
+
+	/* set direction */
+	if (!pci->pin_cfg[offset].dir_msk)
+		return 0;
+
+	ret = regmap_update_bits(pci->rk808->regmap,
+				 pci->pin_cfg[offset].reg,
+				 pci->pin_cfg[offset].dir_msk,
+				 input ? 0 : pci->pin_cfg[offset].dir_msk);
+	if (ret) {
+		dev_err(pci->dev, "set gpio%d direction failed\n", offset);
+		return ret;
+	}
+
+	return ret;
+}
+
+static const struct pinmux_ops rk805_pinmux_ops = {
+	.get_functions_count	= rk805_pinctrl_get_funcs_count,
+	.get_function_name	= rk805_pinctrl_get_func_name,
+	.get_function_groups	= rk805_pinctrl_get_func_groups,
+	.set_mux		= rk805_pinctrl_set_mux,
+	.gpio_set_direction	= rk805_pmx_gpio_set_direction,
+};
+
+static int rk805_pinconf_get(struct pinctrl_dev *pctldev,
+			     unsigned int pin, unsigned long *config)
+{
+	struct rk805_pctrl_info *pci = pinctrl_dev_get_drvdata(pctldev);
+	enum pin_config_param param = pinconf_to_config_param(*config);
+	u32 arg = 0;
+
+	switch (param) {
+	case PIN_CONFIG_OUTPUT:
+		arg = rk805_gpio_get(&pci->gpio_chip, pin);
+		break;
+	default:
+		dev_err(pci->dev, "Properties not supported\n");
+		return -ENOTSUPP;
+	}
+
+	*config = pinconf_to_config_packed(param, (u16)arg);
+
+	return 0;
+}
+
+static int rk805_pinconf_set(struct pinctrl_dev *pctldev,
+			     unsigned int pin, unsigned long *configs,
+			     unsigned int num_configs)
+{
+	struct rk805_pctrl_info *pci = pinctrl_dev_get_drvdata(pctldev);
+	enum pin_config_param param;
+	u32 i, arg = 0;
+
+	for (i = 0; i < num_configs; i++) {
+		param = pinconf_to_config_param(configs[i]);
+		arg = pinconf_to_config_argument(configs[i]);
+
+		switch (param) {
+		case PIN_CONFIG_OUTPUT:
+			rk805_gpio_set(&pci->gpio_chip, pin, arg);
+			rk805_pmx_gpio_set_direction(pctldev, NULL, pin, false);
+			break;
+		default:
+			dev_err(pci->dev, "Properties not supported\n");
+			return -ENOTSUPP;
+		}
+	}
+
+	return 0;
+}
+
+static const struct pinconf_ops rk805_pinconf_ops = {
+	.pin_config_get = rk805_pinconf_get,
+	.pin_config_set = rk805_pinconf_set,
+};
+
+static const struct pinctrl_desc rk805_pinctrl_desc = {
+	.name = "rk805-pinctrl",
+	.pctlops = &rk805_pinctrl_ops,
+	.pmxops = &rk805_pinmux_ops,
+	.confops = &rk805_pinconf_ops,
+	.owner = THIS_MODULE,
+};
+
+static int rk805_pinctrl_probe(struct platform_device *pdev)
+{
+	struct rk805_pctrl_info *pci;
+	int ret;
+
+	pci = devm_kzalloc(&pdev->dev, sizeof(*pci), GFP_KERNEL);
+	if (!pci)
+		return -ENOMEM;
+
+	pci->dev = &pdev->dev;
+	pci->dev->of_node = pdev->dev.parent->of_node;
+	pci->rk808 = dev_get_drvdata(pdev->dev.parent);
+
+	pci->pinctrl_desc = rk805_pinctrl_desc;
+	pci->gpio_chip = rk805_gpio_chip;
+	pci->gpio_chip.parent = &pdev->dev;
+	pci->gpio_chip.of_node = pdev->dev.parent->of_node;
+
+	platform_set_drvdata(pdev, pci);
+
+	switch (pci->rk808->variant) {
+	case RK805_ID:
+		pci->pins = rk805_pins_desc;
+		pci->num_pins = ARRAY_SIZE(rk805_pins_desc);
+		pci->functions = rk805_pin_functions;
+		pci->num_functions = ARRAY_SIZE(rk805_pin_functions);
+		pci->groups = rk805_pin_groups;
+		pci->num_pin_groups = ARRAY_SIZE(rk805_pin_groups);
+		pci->pinctrl_desc.pins = rk805_pins_desc;
+		pci->pinctrl_desc.npins = ARRAY_SIZE(rk805_pins_desc);
+		pci->pin_cfg = rk805_gpio_cfgs;
+		pci->gpio_chip.ngpio = ARRAY_SIZE(rk805_gpio_cfgs);
+		break;
+	default:
+		dev_err(&pdev->dev, "unsupported RK805 ID %lu\n",
+			pci->rk808->variant);
+		return -EINVAL;
+	}
+
+	/* Add gpio chip */
+	ret = devm_gpiochip_add_data(&pdev->dev, &pci->gpio_chip, pci);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "Couldn't add gpiochip\n");
+		return ret;
+	}
+
+	/* Add pinctrl */
+	pci->pctl = devm_pinctrl_register(&pdev->dev, &pci->pinctrl_desc, pci);
+	if (IS_ERR(pci->pctl)) {
+		dev_err(&pdev->dev, "Couldn't add pinctrl\n");
+		return PTR_ERR(pci->pctl);
+	}
+
+	/* Add pin range */
+	ret = gpiochip_add_pin_range(&pci->gpio_chip, dev_name(&pdev->dev),
+				     0, 0, pci->gpio_chip.ngpio);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "Couldn't add gpiochip pin range\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static struct platform_driver rk805_pinctrl_driver = {
+	.probe = rk805_pinctrl_probe,
+	.driver = {
+		.name = "rk805-pinctrl",
+	},
+};
+module_platform_driver(rk805_pinctrl_driver);
+
+MODULE_DESCRIPTION("RK805 pin control and GPIO driver");
+MODULE_AUTHOR("Joseph Chen <chenjh@rock-chips.com>");
+MODULE_LICENSE("GPL v2");