diff options
Diffstat (limited to 'drivers/pinctrl/pinctrl-as3722.c')
| -rw-r--r-- | drivers/pinctrl/pinctrl-as3722.c | 617 |
1 files changed, 617 insertions, 0 deletions
diff --git a/drivers/pinctrl/pinctrl-as3722.c b/drivers/pinctrl/pinctrl-as3722.c new file mode 100644 index 0000000000..f0e5d87ac5 --- /dev/null +++ b/drivers/pinctrl/pinctrl-as3722.c @@ -0,0 +1,617 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * ams AS3722 pin control and GPIO driver. + * + * Copyright (c) 2013, NVIDIA Corporation. + * + * Author: Laxman Dewangan <ldewangan@nvidia.com> + */ + +#include <linux/delay.h> +#include <linux/gpio/driver.h> +#include <linux/kernel.h> +#include <linux/mod_devicetable.h> +#include <linux/module.h> +#include <linux/mfd/as3722.h> +#include <linux/platform_device.h> +#include <linux/pm.h> +#include <linux/property.h> +#include <linux/slab.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 "core.h" +#include "pinconf.h" +#include "pinctrl-utils.h" + +#define AS3722_PIN_GPIO0 0 +#define AS3722_PIN_GPIO1 1 +#define AS3722_PIN_GPIO2 2 +#define AS3722_PIN_GPIO3 3 +#define AS3722_PIN_GPIO4 4 +#define AS3722_PIN_GPIO5 5 +#define AS3722_PIN_GPIO6 6 +#define AS3722_PIN_GPIO7 7 +#define AS3722_PIN_NUM (AS3722_PIN_GPIO7 + 1) + +#define AS3722_GPIO_MODE_PULL_UP BIT(PIN_CONFIG_BIAS_PULL_UP) +#define AS3722_GPIO_MODE_PULL_DOWN BIT(PIN_CONFIG_BIAS_PULL_DOWN) +#define AS3722_GPIO_MODE_HIGH_IMPED BIT(PIN_CONFIG_BIAS_HIGH_IMPEDANCE) +#define AS3722_GPIO_MODE_OPEN_DRAIN BIT(PIN_CONFIG_DRIVE_OPEN_DRAIN) + +struct as3722_pin_function { + const char *name; + const char * const *groups; + unsigned ngroups; + int mux_option; +}; + +struct as3722_gpio_pin_control { + unsigned mode_prop; + int io_function; +}; + +struct as3722_pingroup { + const char *name; + const unsigned pins[1]; + unsigned npins; +}; + +struct as3722_pctrl_info { + struct device *dev; + struct pinctrl_dev *pctl; + struct as3722 *as3722; + struct gpio_chip gpio_chip; + int pins_current_opt[AS3722_PIN_NUM]; + const struct as3722_pin_function *functions; + unsigned num_functions; + const struct as3722_pingroup *pin_groups; + int num_pin_groups; + const struct pinctrl_pin_desc *pins; + unsigned num_pins; + struct as3722_gpio_pin_control gpio_control[AS3722_PIN_NUM]; +}; + +static const struct pinctrl_pin_desc as3722_pins_desc[] = { + PINCTRL_PIN(AS3722_PIN_GPIO0, "gpio0"), + PINCTRL_PIN(AS3722_PIN_GPIO1, "gpio1"), + PINCTRL_PIN(AS3722_PIN_GPIO2, "gpio2"), + PINCTRL_PIN(AS3722_PIN_GPIO3, "gpio3"), + PINCTRL_PIN(AS3722_PIN_GPIO4, "gpio4"), + PINCTRL_PIN(AS3722_PIN_GPIO5, "gpio5"), + PINCTRL_PIN(AS3722_PIN_GPIO6, "gpio6"), + PINCTRL_PIN(AS3722_PIN_GPIO7, "gpio7"), +}; + +static const char * const gpio_groups[] = { + "gpio0", + "gpio1", + "gpio2", + "gpio3", + "gpio4", + "gpio5", + "gpio6", + "gpio7", +}; + +enum as3722_pinmux_option { + AS3722_PINMUX_GPIO = 0, + AS3722_PINMUX_INTERRUPT_OUT = 1, + AS3722_PINMUX_VSUB_VBAT_UNDEB_LOW_OUT = 2, + AS3722_PINMUX_GPIO_INTERRUPT = 3, + AS3722_PINMUX_PWM_INPUT = 4, + AS3722_PINMUX_VOLTAGE_IN_STBY = 5, + AS3722_PINMUX_OC_PG_SD0 = 6, + AS3722_PINMUX_PG_OUT = 7, + AS3722_PINMUX_CLK32K_OUT = 8, + AS3722_PINMUX_WATCHDOG_INPUT = 9, + AS3722_PINMUX_SOFT_RESET_IN = 11, + AS3722_PINMUX_PWM_OUTPUT = 12, + AS3722_PINMUX_VSUB_VBAT_LOW_DEB_OUT = 13, + AS3722_PINMUX_OC_PG_SD6 = 14, +}; + +#define FUNCTION_GROUP(fname, mux) \ + { \ + .name = #fname, \ + .groups = gpio_groups, \ + .ngroups = ARRAY_SIZE(gpio_groups), \ + .mux_option = AS3722_PINMUX_##mux, \ + } + +static const struct as3722_pin_function as3722_pin_function[] = { + FUNCTION_GROUP(gpio, GPIO), + FUNCTION_GROUP(interrupt-out, INTERRUPT_OUT), + FUNCTION_GROUP(gpio-in-interrupt, GPIO_INTERRUPT), + FUNCTION_GROUP(vsup-vbat-low-undebounce-out, VSUB_VBAT_UNDEB_LOW_OUT), + FUNCTION_GROUP(vsup-vbat-low-debounce-out, VSUB_VBAT_LOW_DEB_OUT), + FUNCTION_GROUP(voltage-in-standby, VOLTAGE_IN_STBY), + FUNCTION_GROUP(oc-pg-sd0, OC_PG_SD0), + FUNCTION_GROUP(oc-pg-sd6, OC_PG_SD6), + FUNCTION_GROUP(powergood-out, PG_OUT), + FUNCTION_GROUP(pwm-in, PWM_INPUT), + FUNCTION_GROUP(pwm-out, PWM_OUTPUT), + FUNCTION_GROUP(clk32k-out, CLK32K_OUT), + FUNCTION_GROUP(watchdog-in, WATCHDOG_INPUT), + FUNCTION_GROUP(soft-reset-in, SOFT_RESET_IN), +}; + +#define AS3722_PINGROUP(pg_name, pin_id) \ + { \ + .name = #pg_name, \ + .pins = {AS3722_PIN_##pin_id}, \ + .npins = 1, \ + } + +static const struct as3722_pingroup as3722_pingroups[] = { + AS3722_PINGROUP(gpio0, GPIO0), + AS3722_PINGROUP(gpio1, GPIO1), + AS3722_PINGROUP(gpio2, GPIO2), + AS3722_PINGROUP(gpio3, GPIO3), + AS3722_PINGROUP(gpio4, GPIO4), + AS3722_PINGROUP(gpio5, GPIO5), + AS3722_PINGROUP(gpio6, GPIO6), + AS3722_PINGROUP(gpio7, GPIO7), +}; + +static int as3722_pinctrl_get_groups_count(struct pinctrl_dev *pctldev) +{ + struct as3722_pctrl_info *as_pci = pinctrl_dev_get_drvdata(pctldev); + + return as_pci->num_pin_groups; +} + +static const char *as3722_pinctrl_get_group_name(struct pinctrl_dev *pctldev, + unsigned group) +{ + struct as3722_pctrl_info *as_pci = pinctrl_dev_get_drvdata(pctldev); + + return as_pci->pin_groups[group].name; +} + +static int as3722_pinctrl_get_group_pins(struct pinctrl_dev *pctldev, + unsigned group, const unsigned **pins, unsigned *num_pins) +{ + struct as3722_pctrl_info *as_pci = pinctrl_dev_get_drvdata(pctldev); + + *pins = as_pci->pin_groups[group].pins; + *num_pins = as_pci->pin_groups[group].npins; + return 0; +} + +static const struct pinctrl_ops as3722_pinctrl_ops = { + .get_groups_count = as3722_pinctrl_get_groups_count, + .get_group_name = as3722_pinctrl_get_group_name, + .get_group_pins = as3722_pinctrl_get_group_pins, + .dt_node_to_map = pinconf_generic_dt_node_to_map_pin, + .dt_free_map = pinctrl_utils_free_map, +}; + +static int as3722_pinctrl_get_funcs_count(struct pinctrl_dev *pctldev) +{ + struct as3722_pctrl_info *as_pci = pinctrl_dev_get_drvdata(pctldev); + + return as_pci->num_functions; +} + +static const char *as3722_pinctrl_get_func_name(struct pinctrl_dev *pctldev, + unsigned function) +{ + struct as3722_pctrl_info *as_pci = pinctrl_dev_get_drvdata(pctldev); + + return as_pci->functions[function].name; +} + +static int as3722_pinctrl_get_func_groups(struct pinctrl_dev *pctldev, + unsigned function, const char * const **groups, + unsigned * const num_groups) +{ + struct as3722_pctrl_info *as_pci = pinctrl_dev_get_drvdata(pctldev); + + *groups = as_pci->functions[function].groups; + *num_groups = as_pci->functions[function].ngroups; + return 0; +} + +static int as3722_pinctrl_set(struct pinctrl_dev *pctldev, unsigned function, + unsigned group) +{ + struct as3722_pctrl_info *as_pci = pinctrl_dev_get_drvdata(pctldev); + int gpio_cntr_reg = AS3722_GPIOn_CONTROL_REG(group); + u8 val = AS3722_GPIO_IOSF_VAL(as_pci->functions[function].mux_option); + int ret; + + dev_dbg(as_pci->dev, "%s(): GPIO %u pin to function %u and val %u\n", + __func__, group, function, val); + + ret = as3722_update_bits(as_pci->as3722, gpio_cntr_reg, + AS3722_GPIO_IOSF_MASK, val); + if (ret < 0) { + dev_err(as_pci->dev, "GPIO%d_CTRL_REG update failed %d\n", + group, ret); + return ret; + } + as_pci->gpio_control[group].io_function = function; + + switch (val) { + case AS3722_GPIO_IOSF_SD0_OUT: + case AS3722_GPIO_IOSF_PWR_GOOD_OUT: + case AS3722_GPIO_IOSF_Q32K_OUT: + case AS3722_GPIO_IOSF_PWM_OUT: + case AS3722_GPIO_IOSF_SD6_LOW_VOLT_LOW: + ret = as3722_update_bits(as_pci->as3722, gpio_cntr_reg, + AS3722_GPIO_MODE_MASK, AS3722_GPIO_MODE_OUTPUT_VDDH); + if (ret < 0) { + dev_err(as_pci->dev, "GPIO%d_CTRL update failed %d\n", + group, ret); + return ret; + } + as_pci->gpio_control[group].mode_prop = + AS3722_GPIO_MODE_OUTPUT_VDDH; + break; + default: + break; + } + return ret; +} + +static int as3722_pinctrl_gpio_get_mode(unsigned gpio_mode_prop, bool input) +{ + if (gpio_mode_prop & AS3722_GPIO_MODE_HIGH_IMPED) + return -EINVAL; + + if (gpio_mode_prop & AS3722_GPIO_MODE_OPEN_DRAIN) { + if (gpio_mode_prop & AS3722_GPIO_MODE_PULL_UP) + return AS3722_GPIO_MODE_IO_OPEN_DRAIN_PULL_UP; + return AS3722_GPIO_MODE_IO_OPEN_DRAIN; + } + if (input) { + if (gpio_mode_prop & AS3722_GPIO_MODE_PULL_UP) + return AS3722_GPIO_MODE_INPUT_PULL_UP; + else if (gpio_mode_prop & AS3722_GPIO_MODE_PULL_DOWN) + return AS3722_GPIO_MODE_INPUT_PULL_DOWN; + return AS3722_GPIO_MODE_INPUT; + } + if (gpio_mode_prop & AS3722_GPIO_MODE_PULL_DOWN) + return AS3722_GPIO_MODE_OUTPUT_VDDL; + return AS3722_GPIO_MODE_OUTPUT_VDDH; +} + +static int as3722_pinctrl_gpio_request_enable(struct pinctrl_dev *pctldev, + struct pinctrl_gpio_range *range, unsigned offset) +{ + struct as3722_pctrl_info *as_pci = pinctrl_dev_get_drvdata(pctldev); + + if (as_pci->gpio_control[offset].io_function) + return -EBUSY; + return 0; +} + +static int as3722_pinctrl_gpio_set_direction(struct pinctrl_dev *pctldev, + struct pinctrl_gpio_range *range, unsigned offset, bool input) +{ + struct as3722_pctrl_info *as_pci = pinctrl_dev_get_drvdata(pctldev); + struct as3722 *as3722 = as_pci->as3722; + int mode; + + mode = as3722_pinctrl_gpio_get_mode( + as_pci->gpio_control[offset].mode_prop, input); + if (mode < 0) { + dev_err(as_pci->dev, "%s direction for GPIO %d not supported\n", + (input) ? "Input" : "Output", offset); + return mode; + } + + return as3722_update_bits(as3722, AS3722_GPIOn_CONTROL_REG(offset), + AS3722_GPIO_MODE_MASK, mode); +} + +static const struct pinmux_ops as3722_pinmux_ops = { + .get_functions_count = as3722_pinctrl_get_funcs_count, + .get_function_name = as3722_pinctrl_get_func_name, + .get_function_groups = as3722_pinctrl_get_func_groups, + .set_mux = as3722_pinctrl_set, + .gpio_request_enable = as3722_pinctrl_gpio_request_enable, + .gpio_set_direction = as3722_pinctrl_gpio_set_direction, +}; + +static int as3722_pinconf_get(struct pinctrl_dev *pctldev, + unsigned pin, unsigned long *config) +{ + struct as3722_pctrl_info *as_pci = pinctrl_dev_get_drvdata(pctldev); + enum pin_config_param param = pinconf_to_config_param(*config); + int arg = 0; + u16 prop; + + switch (param) { + case PIN_CONFIG_BIAS_DISABLE: + prop = AS3722_GPIO_MODE_PULL_UP | + AS3722_GPIO_MODE_PULL_DOWN; + if (!(as_pci->gpio_control[pin].mode_prop & prop)) + arg = 1; + prop = 0; + break; + + case PIN_CONFIG_BIAS_PULL_UP: + prop = AS3722_GPIO_MODE_PULL_UP; + break; + + case PIN_CONFIG_BIAS_PULL_DOWN: + prop = AS3722_GPIO_MODE_PULL_DOWN; + break; + + case PIN_CONFIG_DRIVE_OPEN_DRAIN: + prop = AS3722_GPIO_MODE_OPEN_DRAIN; + break; + + case PIN_CONFIG_BIAS_HIGH_IMPEDANCE: + prop = AS3722_GPIO_MODE_HIGH_IMPED; + break; + + default: + dev_err(as_pci->dev, "Properties not supported\n"); + return -ENOTSUPP; + } + + if (as_pci->gpio_control[pin].mode_prop & prop) + arg = 1; + + *config = pinconf_to_config_packed(param, (u16)arg); + return 0; +} + +static int as3722_pinconf_set(struct pinctrl_dev *pctldev, + unsigned pin, unsigned long *configs, + unsigned num_configs) +{ + struct as3722_pctrl_info *as_pci = pinctrl_dev_get_drvdata(pctldev); + enum pin_config_param param; + int mode_prop; + int i; + + for (i = 0; i < num_configs; i++) { + param = pinconf_to_config_param(configs[i]); + mode_prop = as_pci->gpio_control[pin].mode_prop; + + switch (param) { + case PIN_CONFIG_BIAS_PULL_PIN_DEFAULT: + break; + + case PIN_CONFIG_BIAS_DISABLE: + mode_prop &= ~(AS3722_GPIO_MODE_PULL_UP | + AS3722_GPIO_MODE_PULL_DOWN); + break; + case PIN_CONFIG_BIAS_PULL_UP: + mode_prop |= AS3722_GPIO_MODE_PULL_UP; + break; + + case PIN_CONFIG_BIAS_PULL_DOWN: + mode_prop |= AS3722_GPIO_MODE_PULL_DOWN; + break; + + case PIN_CONFIG_BIAS_HIGH_IMPEDANCE: + mode_prop |= AS3722_GPIO_MODE_HIGH_IMPED; + break; + + case PIN_CONFIG_DRIVE_OPEN_DRAIN: + mode_prop |= AS3722_GPIO_MODE_OPEN_DRAIN; + break; + + default: + dev_err(as_pci->dev, "Properties not supported\n"); + return -ENOTSUPP; + } + + as_pci->gpio_control[pin].mode_prop = mode_prop; + } + return 0; +} + +static const struct pinconf_ops as3722_pinconf_ops = { + .pin_config_get = as3722_pinconf_get, + .pin_config_set = as3722_pinconf_set, +}; + +static struct pinctrl_desc as3722_pinctrl_desc = { + .pctlops = &as3722_pinctrl_ops, + .pmxops = &as3722_pinmux_ops, + .confops = &as3722_pinconf_ops, + .owner = THIS_MODULE, +}; + +static int as3722_gpio_get(struct gpio_chip *chip, unsigned offset) +{ + struct as3722_pctrl_info *as_pci = gpiochip_get_data(chip); + struct as3722 *as3722 = as_pci->as3722; + int ret; + u32 reg; + u32 control; + u32 val; + int mode; + int invert_enable; + + ret = as3722_read(as3722, AS3722_GPIOn_CONTROL_REG(offset), &control); + if (ret < 0) { + dev_err(as_pci->dev, + "GPIO_CONTROL%d_REG read failed: %d\n", offset, ret); + return ret; + } + + invert_enable = !!(control & AS3722_GPIO_INV); + mode = control & AS3722_GPIO_MODE_MASK; + switch (mode) { + case AS3722_GPIO_MODE_INPUT: + case AS3722_GPIO_MODE_INPUT_PULL_UP: + case AS3722_GPIO_MODE_INPUT_PULL_DOWN: + case AS3722_GPIO_MODE_IO_OPEN_DRAIN: + case AS3722_GPIO_MODE_IO_OPEN_DRAIN_PULL_UP: + reg = AS3722_GPIO_SIGNAL_IN_REG; + break; + case AS3722_GPIO_MODE_OUTPUT_VDDH: + case AS3722_GPIO_MODE_OUTPUT_VDDL: + reg = AS3722_GPIO_SIGNAL_OUT_REG; + break; + default: + return -EINVAL; + } + + ret = as3722_read(as3722, reg, &val); + if (ret < 0) { + dev_err(as_pci->dev, + "GPIO_SIGNAL_IN_REG read failed: %d\n", ret); + return ret; + } + + val = !!(val & AS3722_GPIOn_SIGNAL(offset)); + return (invert_enable) ? !val : val; +} + +static void as3722_gpio_set(struct gpio_chip *chip, unsigned offset, + int value) +{ + struct as3722_pctrl_info *as_pci = gpiochip_get_data(chip); + struct as3722 *as3722 = as_pci->as3722; + int en_invert; + u32 val; + int ret; + + ret = as3722_read(as3722, AS3722_GPIOn_CONTROL_REG(offset), &val); + if (ret < 0) { + dev_err(as_pci->dev, + "GPIO_CONTROL%d_REG read failed: %d\n", offset, ret); + return; + } + en_invert = !!(val & AS3722_GPIO_INV); + + if (value) + val = (en_invert) ? 0 : AS3722_GPIOn_SIGNAL(offset); + else + val = (en_invert) ? AS3722_GPIOn_SIGNAL(offset) : 0; + + ret = as3722_update_bits(as3722, AS3722_GPIO_SIGNAL_OUT_REG, + AS3722_GPIOn_SIGNAL(offset), val); + if (ret < 0) + dev_err(as_pci->dev, + "GPIO_SIGNAL_OUT_REG update failed: %d\n", ret); +} + +static int as3722_gpio_direction_input(struct gpio_chip *chip, unsigned offset) +{ + return pinctrl_gpio_direction_input(chip->base + offset); +} + +static int as3722_gpio_direction_output(struct gpio_chip *chip, + unsigned offset, int value) +{ + as3722_gpio_set(chip, offset, value); + return pinctrl_gpio_direction_output(chip->base + offset); +} + +static int as3722_gpio_to_irq(struct gpio_chip *chip, unsigned offset) +{ + struct as3722_pctrl_info *as_pci = gpiochip_get_data(chip); + + return as3722_irq_get_virq(as_pci->as3722, offset); +} + +static const struct gpio_chip as3722_gpio_chip = { + .label = "as3722-gpio", + .owner = THIS_MODULE, + .request = gpiochip_generic_request, + .free = gpiochip_generic_free, + .get = as3722_gpio_get, + .set = as3722_gpio_set, + .direction_input = as3722_gpio_direction_input, + .direction_output = as3722_gpio_direction_output, + .to_irq = as3722_gpio_to_irq, + .can_sleep = true, + .ngpio = AS3722_PIN_NUM, + .base = -1, +}; + +static int as3722_pinctrl_probe(struct platform_device *pdev) +{ + struct as3722_pctrl_info *as_pci; + int ret; + + device_set_node(&pdev->dev, dev_fwnode(pdev->dev.parent)); + + as_pci = devm_kzalloc(&pdev->dev, sizeof(*as_pci), GFP_KERNEL); + if (!as_pci) + return -ENOMEM; + + as_pci->dev = &pdev->dev; + as_pci->as3722 = dev_get_drvdata(pdev->dev.parent); + platform_set_drvdata(pdev, as_pci); + + as_pci->pins = as3722_pins_desc; + as_pci->num_pins = ARRAY_SIZE(as3722_pins_desc); + as_pci->functions = as3722_pin_function; + as_pci->num_functions = ARRAY_SIZE(as3722_pin_function); + as_pci->pin_groups = as3722_pingroups; + as_pci->num_pin_groups = ARRAY_SIZE(as3722_pingroups); + as3722_pinctrl_desc.name = dev_name(&pdev->dev); + as3722_pinctrl_desc.pins = as3722_pins_desc; + as3722_pinctrl_desc.npins = ARRAY_SIZE(as3722_pins_desc); + as_pci->pctl = devm_pinctrl_register(&pdev->dev, &as3722_pinctrl_desc, + as_pci); + if (IS_ERR(as_pci->pctl)) { + dev_err(&pdev->dev, "Couldn't register pinctrl driver\n"); + return PTR_ERR(as_pci->pctl); + } + + as_pci->gpio_chip = as3722_gpio_chip; + as_pci->gpio_chip.parent = &pdev->dev; + ret = gpiochip_add_data(&as_pci->gpio_chip, as_pci); + if (ret < 0) { + dev_err(&pdev->dev, "Couldn't register gpiochip, %d\n", ret); + return ret; + } + + ret = gpiochip_add_pin_range(&as_pci->gpio_chip, dev_name(&pdev->dev), + 0, 0, AS3722_PIN_NUM); + if (ret < 0) { + dev_err(&pdev->dev, "Couldn't add pin range, %d\n", ret); + goto fail_range_add; + } + + return 0; + +fail_range_add: + gpiochip_remove(&as_pci->gpio_chip); + return ret; +} + +static int as3722_pinctrl_remove(struct platform_device *pdev) +{ + struct as3722_pctrl_info *as_pci = platform_get_drvdata(pdev); + + gpiochip_remove(&as_pci->gpio_chip); + return 0; +} + +static const struct of_device_id as3722_pinctrl_of_match[] = { + { .compatible = "ams,as3722-pinctrl", }, + { }, +}; +MODULE_DEVICE_TABLE(of, as3722_pinctrl_of_match); + +static struct platform_driver as3722_pinctrl_driver = { + .driver = { + .name = "as3722-pinctrl", + .of_match_table = as3722_pinctrl_of_match, + }, + .probe = as3722_pinctrl_probe, + .remove = as3722_pinctrl_remove, +}; +module_platform_driver(as3722_pinctrl_driver); + +MODULE_ALIAS("platform:as3722-pinctrl"); +MODULE_DESCRIPTION("AS3722 pin control and GPIO driver"); +MODULE_AUTHOR("Laxman Dewangan<ldewangan@nvidia.com>"); +MODULE_LICENSE("GPL v2"); |