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path: root/drivers/pinctrl/pinctrl-axp209.c
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Diffstat (limited to 'drivers/pinctrl/pinctrl-axp209.c')
-rw-r--r--drivers/pinctrl/pinctrl-axp209.c478
1 files changed, 478 insertions, 0 deletions
diff --git a/drivers/pinctrl/pinctrl-axp209.c b/drivers/pinctrl/pinctrl-axp209.c
new file mode 100644
index 000000000000..1231bbbfa744
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-axp209.c
@@ -0,0 +1,478 @@
+/*
+ * AXP20x pinctrl and GPIO driver
+ *
+ * Copyright (C) 2016 Maxime Ripard <maxime.ripard@free-electrons.com>
+ * Copyright (C) 2017 Quentin Schulz <quentin.schulz@free-electrons.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/bitops.h>
+#include <linux/device.h>
+#include <linux/gpio/driver.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/mfd/axp20x.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/pinctrl/pinconf-generic.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+
+#define AXP20X_GPIO_FUNCTIONS 0x7
+#define AXP20X_GPIO_FUNCTION_OUT_LOW 0
+#define AXP20X_GPIO_FUNCTION_OUT_HIGH 1
+#define AXP20X_GPIO_FUNCTION_INPUT 2
+
+#define AXP20X_FUNC_GPIO_OUT 0
+#define AXP20X_FUNC_GPIO_IN 1
+#define AXP20X_FUNC_LDO 2
+#define AXP20X_FUNC_ADC 3
+#define AXP20X_FUNCS_NB 4
+
+#define AXP20X_MUX_GPIO_OUT 0
+#define AXP20X_MUX_GPIO_IN BIT(1)
+#define AXP20X_MUX_ADC BIT(2)
+
+#define AXP813_MUX_ADC (BIT(2) | BIT(0))
+
+struct axp20x_pctrl_desc {
+ const struct pinctrl_pin_desc *pins;
+ unsigned int npins;
+ /* Stores the pins supporting LDO function. Bit offset is pin number. */
+ u8 ldo_mask;
+ /* Stores the pins supporting ADC function. Bit offset is pin number. */
+ u8 adc_mask;
+ u8 gpio_status_offset;
+ u8 adc_mux;
+};
+
+struct axp20x_pinctrl_function {
+ const char *name;
+ unsigned int muxval;
+ const char **groups;
+ unsigned int ngroups;
+};
+
+struct axp20x_pctl {
+ struct gpio_chip chip;
+ struct regmap *regmap;
+ struct pinctrl_dev *pctl_dev;
+ struct device *dev;
+ const struct axp20x_pctrl_desc *desc;
+ struct axp20x_pinctrl_function funcs[AXP20X_FUNCS_NB];
+};
+
+static const struct pinctrl_pin_desc axp209_pins[] = {
+ PINCTRL_PIN(0, "GPIO0"),
+ PINCTRL_PIN(1, "GPIO1"),
+ PINCTRL_PIN(2, "GPIO2"),
+};
+
+static const struct pinctrl_pin_desc axp813_pins[] = {
+ PINCTRL_PIN(0, "GPIO0"),
+ PINCTRL_PIN(1, "GPIO1"),
+};
+
+static const struct axp20x_pctrl_desc axp20x_data = {
+ .pins = axp209_pins,
+ .npins = ARRAY_SIZE(axp209_pins),
+ .ldo_mask = BIT(0) | BIT(1),
+ .adc_mask = BIT(0) | BIT(1),
+ .gpio_status_offset = 4,
+ .adc_mux = AXP20X_MUX_ADC,
+};
+
+static const struct axp20x_pctrl_desc axp813_data = {
+ .pins = axp813_pins,
+ .npins = ARRAY_SIZE(axp813_pins),
+ .ldo_mask = BIT(0) | BIT(1),
+ .adc_mask = BIT(0),
+ .gpio_status_offset = 0,
+ .adc_mux = AXP813_MUX_ADC,
+};
+
+static int axp20x_gpio_get_reg(unsigned int offset)
+{
+ switch (offset) {
+ case 0:
+ return AXP20X_GPIO0_CTRL;
+ case 1:
+ return AXP20X_GPIO1_CTRL;
+ case 2:
+ return AXP20X_GPIO2_CTRL;
+ }
+
+ return -EINVAL;
+}
+
+static int axp20x_gpio_input(struct gpio_chip *chip, unsigned int offset)
+{
+ return pinctrl_gpio_direction_input(chip->base + offset);
+}
+
+static int axp20x_gpio_get(struct gpio_chip *chip, unsigned int offset)
+{
+ struct axp20x_pctl *pctl = gpiochip_get_data(chip);
+ unsigned int val;
+ int ret;
+
+ ret = regmap_read(pctl->regmap, AXP20X_GPIO20_SS, &val);
+ if (ret)
+ return ret;
+
+ return !!(val & BIT(offset + pctl->desc->gpio_status_offset));
+}
+
+static int axp20x_gpio_get_direction(struct gpio_chip *chip,
+ unsigned int offset)
+{
+ struct axp20x_pctl *pctl = gpiochip_get_data(chip);
+ unsigned int val;
+ int reg, ret;
+
+ reg = axp20x_gpio_get_reg(offset);
+ if (reg < 0)
+ return reg;
+
+ ret = regmap_read(pctl->regmap, reg, &val);
+ if (ret)
+ return ret;
+
+ /*
+ * This shouldn't really happen if the pin is in use already,
+ * or if it's not in use yet, it doesn't matter since we're
+ * going to change the value soon anyway. Default to output.
+ */
+ if ((val & AXP20X_GPIO_FUNCTIONS) > 2)
+ return 0;
+
+ /*
+ * The GPIO directions are the three lowest values.
+ * 2 is input, 0 and 1 are output
+ */
+ return val & 2;
+}
+
+static int axp20x_gpio_output(struct gpio_chip *chip, unsigned int offset,
+ int value)
+{
+ chip->set(chip, offset, value);
+
+ return 0;
+}
+
+static void axp20x_gpio_set(struct gpio_chip *chip, unsigned int offset,
+ int value)
+{
+ struct axp20x_pctl *pctl = gpiochip_get_data(chip);
+ int reg;
+
+ reg = axp20x_gpio_get_reg(offset);
+ if (reg < 0)
+ return;
+
+ regmap_update_bits(pctl->regmap, reg,
+ AXP20X_GPIO_FUNCTIONS,
+ value ? AXP20X_GPIO_FUNCTION_OUT_HIGH :
+ AXP20X_GPIO_FUNCTION_OUT_LOW);
+}
+
+static int axp20x_pmx_set(struct pinctrl_dev *pctldev, unsigned int offset,
+ u8 config)
+{
+ struct axp20x_pctl *pctl = pinctrl_dev_get_drvdata(pctldev);
+ int reg;
+
+ reg = axp20x_gpio_get_reg(offset);
+ if (reg < 0)
+ return reg;
+
+ return regmap_update_bits(pctl->regmap, reg, AXP20X_GPIO_FUNCTIONS,
+ config);
+}
+
+static int axp20x_pmx_func_cnt(struct pinctrl_dev *pctldev)
+{
+ struct axp20x_pctl *pctl = pinctrl_dev_get_drvdata(pctldev);
+
+ return ARRAY_SIZE(pctl->funcs);
+}
+
+static const char *axp20x_pmx_func_name(struct pinctrl_dev *pctldev,
+ unsigned int selector)
+{
+ struct axp20x_pctl *pctl = pinctrl_dev_get_drvdata(pctldev);
+
+ return pctl->funcs[selector].name;
+}
+
+static int axp20x_pmx_func_groups(struct pinctrl_dev *pctldev,
+ unsigned int selector,
+ const char * const **groups,
+ unsigned int *num_groups)
+{
+ struct axp20x_pctl *pctl = pinctrl_dev_get_drvdata(pctldev);
+
+ *groups = pctl->funcs[selector].groups;
+ *num_groups = pctl->funcs[selector].ngroups;
+
+ return 0;
+}
+
+static int axp20x_pmx_set_mux(struct pinctrl_dev *pctldev,
+ unsigned int function, unsigned int group)
+{
+ struct axp20x_pctl *pctl = pinctrl_dev_get_drvdata(pctldev);
+ unsigned int mask;
+
+ /* Every pin supports GPIO_OUT and GPIO_IN functions */
+ if (function <= AXP20X_FUNC_GPIO_IN)
+ return axp20x_pmx_set(pctldev, group,
+ pctl->funcs[function].muxval);
+
+ if (function == AXP20X_FUNC_LDO)
+ mask = pctl->desc->ldo_mask;
+ else
+ mask = pctl->desc->adc_mask;
+
+ if (!(BIT(group) & mask))
+ return -EINVAL;
+
+ /*
+ * We let the regulator framework handle the LDO muxing as muxing bits
+ * are basically also regulators on/off bits. It's better not to enforce
+ * any state of the regulator when selecting LDO mux so that we don't
+ * interfere with the regulator driver.
+ */
+ if (function == AXP20X_FUNC_LDO)
+ return 0;
+
+ return axp20x_pmx_set(pctldev, group, pctl->funcs[function].muxval);
+}
+
+static int axp20x_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
+ struct pinctrl_gpio_range *range,
+ unsigned int offset, bool input)
+{
+ struct axp20x_pctl *pctl = pinctrl_dev_get_drvdata(pctldev);
+
+ if (input)
+ return axp20x_pmx_set(pctldev, offset,
+ pctl->funcs[AXP20X_FUNC_GPIO_IN].muxval);
+
+ return axp20x_pmx_set(pctldev, offset,
+ pctl->funcs[AXP20X_FUNC_GPIO_OUT].muxval);
+}
+
+static const struct pinmux_ops axp20x_pmx_ops = {
+ .get_functions_count = axp20x_pmx_func_cnt,
+ .get_function_name = axp20x_pmx_func_name,
+ .get_function_groups = axp20x_pmx_func_groups,
+ .set_mux = axp20x_pmx_set_mux,
+ .gpio_set_direction = axp20x_pmx_gpio_set_direction,
+ .strict = true,
+};
+
+static int axp20x_groups_cnt(struct pinctrl_dev *pctldev)
+{
+ struct axp20x_pctl *pctl = pinctrl_dev_get_drvdata(pctldev);
+
+ return pctl->desc->npins;
+}
+
+static int axp20x_group_pins(struct pinctrl_dev *pctldev, unsigned int selector,
+ const unsigned int **pins, unsigned int *num_pins)
+{
+ struct axp20x_pctl *pctl = pinctrl_dev_get_drvdata(pctldev);
+
+ *pins = (unsigned int *)&pctl->desc->pins[selector];
+ *num_pins = 1;
+
+ return 0;
+}
+
+static const char *axp20x_group_name(struct pinctrl_dev *pctldev,
+ unsigned int selector)
+{
+ struct axp20x_pctl *pctl = pinctrl_dev_get_drvdata(pctldev);
+
+ return pctl->desc->pins[selector].name;
+}
+
+static const struct pinctrl_ops axp20x_pctrl_ops = {
+ .dt_node_to_map = pinconf_generic_dt_node_to_map_group,
+ .dt_free_map = pinconf_generic_dt_free_map,
+ .get_groups_count = axp20x_groups_cnt,
+ .get_group_name = axp20x_group_name,
+ .get_group_pins = axp20x_group_pins,
+};
+
+static void axp20x_funcs_groups_from_mask(struct device *dev, unsigned int mask,
+ unsigned int mask_len,
+ struct axp20x_pinctrl_function *func,
+ const struct pinctrl_pin_desc *pins)
+{
+ unsigned long int mask_cpy = mask;
+ const char **group;
+ unsigned int ngroups = hweight8(mask);
+ int bit;
+
+ func->ngroups = ngroups;
+ if (func->ngroups > 0) {
+ func->groups = devm_kzalloc(dev, ngroups * sizeof(const char *),
+ GFP_KERNEL);
+ group = func->groups;
+ for_each_set_bit(bit, &mask_cpy, mask_len) {
+ *group = pins[bit].name;
+ group++;
+ }
+ }
+}
+
+static void axp20x_build_funcs_groups(struct platform_device *pdev)
+{
+ struct axp20x_pctl *pctl = platform_get_drvdata(pdev);
+ int i, pin, npins = pctl->desc->npins;
+
+ pctl->funcs[AXP20X_FUNC_GPIO_OUT].name = "gpio_out";
+ pctl->funcs[AXP20X_FUNC_GPIO_OUT].muxval = AXP20X_MUX_GPIO_OUT;
+ pctl->funcs[AXP20X_FUNC_GPIO_IN].name = "gpio_in";
+ pctl->funcs[AXP20X_FUNC_GPIO_IN].muxval = AXP20X_MUX_GPIO_IN;
+ pctl->funcs[AXP20X_FUNC_LDO].name = "ldo";
+ /*
+ * Muxval for LDO is useless as we won't use it.
+ * See comment in axp20x_pmx_set_mux.
+ */
+ pctl->funcs[AXP20X_FUNC_ADC].name = "adc";
+ pctl->funcs[AXP20X_FUNC_ADC].muxval = pctl->desc->adc_mux;
+
+ /* Every pin supports GPIO_OUT and GPIO_IN functions */
+ for (i = 0; i <= AXP20X_FUNC_GPIO_IN; i++) {
+ pctl->funcs[i].ngroups = npins;
+ pctl->funcs[i].groups = devm_kzalloc(&pdev->dev,
+ npins * sizeof(char *),
+ GFP_KERNEL);
+ for (pin = 0; pin < npins; pin++)
+ pctl->funcs[i].groups[pin] = pctl->desc->pins[pin].name;
+ }
+
+ axp20x_funcs_groups_from_mask(&pdev->dev, pctl->desc->ldo_mask,
+ npins, &pctl->funcs[AXP20X_FUNC_LDO],
+ pctl->desc->pins);
+
+ axp20x_funcs_groups_from_mask(&pdev->dev, pctl->desc->adc_mask,
+ npins, &pctl->funcs[AXP20X_FUNC_ADC],
+ pctl->desc->pins);
+}
+
+static const struct of_device_id axp20x_pctl_match[] = {
+ { .compatible = "x-powers,axp209-gpio", .data = &axp20x_data, },
+ { .compatible = "x-powers,axp813-gpio", .data = &axp813_data, },
+ { }
+};
+MODULE_DEVICE_TABLE(of, axp20x_pctl_match);
+
+static int axp20x_pctl_probe(struct platform_device *pdev)
+{
+ struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
+ struct axp20x_pctl *pctl;
+ struct device *dev = &pdev->dev;
+ struct pinctrl_desc *pctrl_desc;
+ int ret;
+
+ if (!of_device_is_available(pdev->dev.of_node))
+ return -ENODEV;
+
+ if (!axp20x) {
+ dev_err(&pdev->dev, "Parent drvdata not set\n");
+ return -EINVAL;
+ }
+
+ pctl = devm_kzalloc(&pdev->dev, sizeof(*pctl), GFP_KERNEL);
+ if (!pctl)
+ return -ENOMEM;
+
+ pctl->chip.base = -1;
+ pctl->chip.can_sleep = true;
+ pctl->chip.request = gpiochip_generic_request;
+ pctl->chip.free = gpiochip_generic_free;
+ pctl->chip.parent = &pdev->dev;
+ pctl->chip.label = dev_name(&pdev->dev);
+ pctl->chip.owner = THIS_MODULE;
+ pctl->chip.get = axp20x_gpio_get;
+ pctl->chip.get_direction = axp20x_gpio_get_direction;
+ pctl->chip.set = axp20x_gpio_set;
+ pctl->chip.direction_input = axp20x_gpio_input;
+ pctl->chip.direction_output = axp20x_gpio_output;
+
+ pctl->desc = of_device_get_match_data(dev);
+
+ pctl->chip.ngpio = pctl->desc->npins;
+
+ pctl->regmap = axp20x->regmap;
+ pctl->dev = &pdev->dev;
+
+ platform_set_drvdata(pdev, pctl);
+
+ axp20x_build_funcs_groups(pdev);
+
+ pctrl_desc = devm_kzalloc(&pdev->dev, sizeof(*pctrl_desc), GFP_KERNEL);
+ if (!pctrl_desc)
+ return -ENOMEM;
+
+ pctrl_desc->name = dev_name(&pdev->dev);
+ pctrl_desc->owner = THIS_MODULE;
+ pctrl_desc->pins = pctl->desc->pins;
+ pctrl_desc->npins = pctl->desc->npins;
+ pctrl_desc->pctlops = &axp20x_pctrl_ops;
+ pctrl_desc->pmxops = &axp20x_pmx_ops;
+
+ pctl->pctl_dev = devm_pinctrl_register(&pdev->dev, pctrl_desc, pctl);
+ if (IS_ERR(pctl->pctl_dev)) {
+ dev_err(&pdev->dev, "couldn't register pinctrl driver\n");
+ return PTR_ERR(pctl->pctl_dev);
+ }
+
+ ret = devm_gpiochip_add_data(&pdev->dev, &pctl->chip, pctl);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to register GPIO chip\n");
+ return ret;
+ }
+
+ ret = gpiochip_add_pin_range(&pctl->chip, dev_name(&pdev->dev),
+ pctl->desc->pins->number,
+ pctl->desc->pins->number,
+ pctl->desc->npins);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to add pin range\n");
+ return ret;
+ }
+
+ dev_info(&pdev->dev, "AXP209 pinctrl and GPIO driver loaded\n");
+
+ return 0;
+}
+
+static struct platform_driver axp20x_pctl_driver = {
+ .probe = axp20x_pctl_probe,
+ .driver = {
+ .name = "axp20x-gpio",
+ .of_match_table = axp20x_pctl_match,
+ },
+};
+
+module_platform_driver(axp20x_pctl_driver);
+
+MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
+MODULE_AUTHOR("Quentin Schulz <quentin.schulz@free-electrons.com>");
+MODULE_DESCRIPTION("AXP20x PMIC pinctrl and GPIO driver");
+MODULE_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-11 22:26:29 +0300