diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/pinctrl/renesas/pinctrl-rza2.c | 531 |
1 files changed, 531 insertions, 0 deletions
diff --git a/drivers/pinctrl/renesas/pinctrl-rza2.c b/drivers/pinctrl/renesas/pinctrl-rza2.c new file mode 100644 index 000000000..ddd8ee6b6 --- /dev/null +++ b/drivers/pinctrl/renesas/pinctrl-rza2.c @@ -0,0 +1,531 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Combined GPIO and pin controller support for Renesas RZ/A2 (R7S9210) SoC + * + * Copyright (C) 2018 Chris Brandt + */ + +/* + * This pin controller/gpio combined driver supports Renesas devices of RZ/A2 + * family. + */ + +#include <linux/bitops.h> +#include <linux/gpio/driver.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/of_device.h> +#include <linux/pinctrl/pinmux.h> + +#include "../core.h" +#include "../pinmux.h" + +#define DRIVER_NAME "pinctrl-rza2" + +#define RZA2_PINS_PER_PORT 8 +#define RZA2_PIN_ID_TO_PORT(id) ((id) / RZA2_PINS_PER_PORT) +#define RZA2_PIN_ID_TO_PIN(id) ((id) % RZA2_PINS_PER_PORT) + +/* + * Use 16 lower bits [15:0] for pin identifier + * Use 16 higher bits [31:16] for pin mux function + */ +#define MUX_PIN_ID_MASK GENMASK(15, 0) +#define MUX_FUNC_MASK GENMASK(31, 16) +#define MUX_FUNC_OFFS 16 +#define MUX_FUNC(pinconf) ((pinconf & MUX_FUNC_MASK) >> MUX_FUNC_OFFS) + +static const char port_names[] = "0123456789ABCDEFGHJKLM"; + +struct rza2_pinctrl_priv { + struct device *dev; + void __iomem *base; + + struct pinctrl_pin_desc *pins; + struct pinctrl_desc desc; + struct pinctrl_dev *pctl; + struct pinctrl_gpio_range gpio_range; + int npins; + struct mutex mutex; /* serialize adding groups and functions */ +}; + +#define RZA2_PDR(port) (0x0000 + (port) * 2) /* Direction 16-bit */ +#define RZA2_PODR(port) (0x0040 + (port)) /* Output Data 8-bit */ +#define RZA2_PIDR(port) (0x0060 + (port)) /* Input Data 8-bit */ +#define RZA2_PMR(port) (0x0080 + (port)) /* Mode 8-bit */ +#define RZA2_DSCR(port) (0x0140 + (port) * 2) /* Drive 16-bit */ +#define RZA2_PFS(port, pin) (0x0200 + ((port) * 8) + (pin)) /* Fnct 8-bit */ + +#define RZA2_PWPR 0x02ff /* Write Protect 8-bit */ +#define RZA2_PFENET 0x0820 /* Ethernet Pins 8-bit */ +#define RZA2_PPOC 0x0900 /* Dedicated Pins 32-bit */ +#define RZA2_PHMOMO 0x0980 /* Peripheral Pins 32-bit */ +#define RZA2_PCKIO 0x09d0 /* CKIO Drive 8-bit */ + +#define RZA2_PDR_INPUT 0x02 +#define RZA2_PDR_OUTPUT 0x03 +#define RZA2_PDR_MASK 0x03 + +#define PWPR_B0WI BIT(7) /* Bit Write Disable */ +#define PWPR_PFSWE BIT(6) /* PFS Register Write Enable */ +#define PFS_ISEL BIT(6) /* Interrupt Select */ + +static void rza2_set_pin_function(void __iomem *pfc_base, u8 port, u8 pin, + u8 func) +{ + u16 mask16; + u16 reg16; + u8 reg8; + + /* Set pin to 'Non-use (Hi-z input protection)' */ + reg16 = readw(pfc_base + RZA2_PDR(port)); + mask16 = RZA2_PDR_MASK << (pin * 2); + reg16 &= ~mask16; + writew(reg16, pfc_base + RZA2_PDR(port)); + + /* Temporarily switch to GPIO */ + reg8 = readb(pfc_base + RZA2_PMR(port)); + reg8 &= ~BIT(pin); + writeb(reg8, pfc_base + RZA2_PMR(port)); + + /* PFS Register Write Protect : OFF */ + writeb(0x00, pfc_base + RZA2_PWPR); /* B0WI=0, PFSWE=0 */ + writeb(PWPR_PFSWE, pfc_base + RZA2_PWPR); /* B0WI=0, PFSWE=1 */ + + /* Set Pin function (interrupt disabled, ISEL=0) */ + writeb(func, pfc_base + RZA2_PFS(port, pin)); + + /* PFS Register Write Protect : ON */ + writeb(0x00, pfc_base + RZA2_PWPR); /* B0WI=0, PFSWE=0 */ + writeb(0x80, pfc_base + RZA2_PWPR); /* B0WI=1, PFSWE=0 */ + + /* Port Mode : Peripheral module pin functions */ + reg8 = readb(pfc_base + RZA2_PMR(port)); + reg8 |= BIT(pin); + writeb(reg8, pfc_base + RZA2_PMR(port)); +} + +static void rza2_pin_to_gpio(void __iomem *pfc_base, unsigned int offset, + u8 dir) +{ + u8 port = RZA2_PIN_ID_TO_PORT(offset); + u8 pin = RZA2_PIN_ID_TO_PIN(offset); + u16 mask16; + u16 reg16; + + reg16 = readw(pfc_base + RZA2_PDR(port)); + mask16 = RZA2_PDR_MASK << (pin * 2); + reg16 &= ~mask16; + + if (dir) + reg16 |= RZA2_PDR_INPUT << (pin * 2); /* pin as input */ + else + reg16 |= RZA2_PDR_OUTPUT << (pin * 2); /* pin as output */ + + writew(reg16, pfc_base + RZA2_PDR(port)); +} + +static int rza2_chip_get_direction(struct gpio_chip *chip, unsigned int offset) +{ + struct rza2_pinctrl_priv *priv = gpiochip_get_data(chip); + u8 port = RZA2_PIN_ID_TO_PORT(offset); + u8 pin = RZA2_PIN_ID_TO_PIN(offset); + u16 reg16; + + reg16 = readw(priv->base + RZA2_PDR(port)); + reg16 = (reg16 >> (pin * 2)) & RZA2_PDR_MASK; + + if (reg16 == RZA2_PDR_OUTPUT) + return GPIO_LINE_DIRECTION_OUT; + + if (reg16 == RZA2_PDR_INPUT) + return GPIO_LINE_DIRECTION_IN; + + /* + * This GPIO controller has a default Hi-Z state that is not input or + * output, so force the pin to input now. + */ + rza2_pin_to_gpio(priv->base, offset, 1); + + return GPIO_LINE_DIRECTION_IN; +} + +static int rza2_chip_direction_input(struct gpio_chip *chip, + unsigned int offset) +{ + struct rza2_pinctrl_priv *priv = gpiochip_get_data(chip); + + rza2_pin_to_gpio(priv->base, offset, 1); + + return 0; +} + +static int rza2_chip_get(struct gpio_chip *chip, unsigned int offset) +{ + struct rza2_pinctrl_priv *priv = gpiochip_get_data(chip); + u8 port = RZA2_PIN_ID_TO_PORT(offset); + u8 pin = RZA2_PIN_ID_TO_PIN(offset); + + return !!(readb(priv->base + RZA2_PIDR(port)) & BIT(pin)); +} + +static void rza2_chip_set(struct gpio_chip *chip, unsigned int offset, + int value) +{ + struct rza2_pinctrl_priv *priv = gpiochip_get_data(chip); + u8 port = RZA2_PIN_ID_TO_PORT(offset); + u8 pin = RZA2_PIN_ID_TO_PIN(offset); + u8 new_value; + + new_value = readb(priv->base + RZA2_PODR(port)); + + if (value) + new_value |= BIT(pin); + else + new_value &= ~BIT(pin); + + writeb(new_value, priv->base + RZA2_PODR(port)); +} + +static int rza2_chip_direction_output(struct gpio_chip *chip, + unsigned int offset, int val) +{ + struct rza2_pinctrl_priv *priv = gpiochip_get_data(chip); + + rza2_chip_set(chip, offset, val); + rza2_pin_to_gpio(priv->base, offset, 0); + + return 0; +} + +static const char * const rza2_gpio_names[] = { + "P0_0", "P0_1", "P0_2", "P0_3", "P0_4", "P0_5", "P0_6", "P0_7", + "P1_0", "P1_1", "P1_2", "P1_3", "P1_4", "P1_5", "P1_6", "P1_7", + "P2_0", "P2_1", "P2_2", "P2_3", "P2_4", "P2_5", "P2_6", "P2_7", + "P3_0", "P3_1", "P3_2", "P3_3", "P3_4", "P3_5", "P3_6", "P3_7", + "P4_0", "P4_1", "P4_2", "P4_3", "P4_4", "P4_5", "P4_6", "P4_7", + "P5_0", "P5_1", "P5_2", "P5_3", "P5_4", "P5_5", "P5_6", "P5_7", + "P6_0", "P6_1", "P6_2", "P6_3", "P6_4", "P6_5", "P6_6", "P6_7", + "P7_0", "P7_1", "P7_2", "P7_3", "P7_4", "P7_5", "P7_6", "P7_7", + "P8_0", "P8_1", "P8_2", "P8_3", "P8_4", "P8_5", "P8_6", "P8_7", + "P9_0", "P9_1", "P9_2", "P9_3", "P9_4", "P9_5", "P9_6", "P9_7", + "PA_0", "PA_1", "PA_2", "PA_3", "PA_4", "PA_5", "PA_6", "PA_7", + "PB_0", "PB_1", "PB_2", "PB_3", "PB_4", "PB_5", "PB_6", "PB_7", + "PC_0", "PC_1", "PC_2", "PC_3", "PC_4", "PC_5", "PC_6", "PC_7", + "PD_0", "PD_1", "PD_2", "PD_3", "PD_4", "PD_5", "PD_6", "PD_7", + "PE_0", "PE_1", "PE_2", "PE_3", "PE_4", "PE_5", "PE_6", "PE_7", + "PF_0", "PF_1", "PF_2", "PF_3", "PF_4", "PF_5", "PF_6", "PF_7", + "PG_0", "PG_1", "PG_2", "PG_3", "PG_4", "PG_5", "PG_6", "PG_7", + "PH_0", "PH_1", "PH_2", "PH_3", "PH_4", "PH_5", "PH_6", "PH_7", + /* port I does not exist */ + "PJ_0", "PJ_1", "PJ_2", "PJ_3", "PJ_4", "PJ_5", "PJ_6", "PJ_7", + "PK_0", "PK_1", "PK_2", "PK_3", "PK_4", "PK_5", "PK_6", "PK_7", + "PL_0", "PL_1", "PL_2", "PL_3", "PL_4", "PL_5", "PL_6", "PL_7", + "PM_0", "PM_1", "PM_2", "PM_3", "PM_4", "PM_5", "PM_6", "PM_7", +}; + +static struct gpio_chip chip = { + .names = rza2_gpio_names, + .base = -1, + .get_direction = rza2_chip_get_direction, + .direction_input = rza2_chip_direction_input, + .direction_output = rza2_chip_direction_output, + .get = rza2_chip_get, + .set = rza2_chip_set, +}; + +static int rza2_gpio_register(struct rza2_pinctrl_priv *priv) +{ + struct device_node *np = priv->dev->of_node; + struct of_phandle_args of_args; + int ret; + + chip.label = devm_kasprintf(priv->dev, GFP_KERNEL, "%pOFn", np); + chip.of_node = np; + chip.parent = priv->dev; + chip.ngpio = priv->npins; + + ret = of_parse_phandle_with_fixed_args(np, "gpio-ranges", 3, 0, + &of_args); + if (ret) { + dev_err(priv->dev, "Unable to parse gpio-ranges\n"); + return ret; + } + + if ((of_args.args[0] != 0) || + (of_args.args[1] != 0) || + (of_args.args[2] != priv->npins)) { + dev_err(priv->dev, "gpio-ranges does not match selected SOC\n"); + return -EINVAL; + } + priv->gpio_range.id = 0; + priv->gpio_range.pin_base = priv->gpio_range.base = 0; + priv->gpio_range.npins = priv->npins; + priv->gpio_range.name = chip.label; + priv->gpio_range.gc = &chip; + + /* Register our gpio chip with gpiolib */ + ret = devm_gpiochip_add_data(priv->dev, &chip, priv); + if (ret) + return ret; + + /* Register pin range with pinctrl core */ + pinctrl_add_gpio_range(priv->pctl, &priv->gpio_range); + + dev_dbg(priv->dev, "Registered gpio controller\n"); + + return 0; +} + +static int rza2_pinctrl_register(struct rza2_pinctrl_priv *priv) +{ + struct pinctrl_pin_desc *pins; + unsigned int i; + int ret; + + pins = devm_kcalloc(priv->dev, priv->npins, sizeof(*pins), GFP_KERNEL); + if (!pins) + return -ENOMEM; + + priv->pins = pins; + priv->desc.pins = pins; + priv->desc.npins = priv->npins; + + for (i = 0; i < priv->npins; i++) { + pins[i].number = i; + pins[i].name = rza2_gpio_names[i]; + } + + ret = devm_pinctrl_register_and_init(priv->dev, &priv->desc, priv, + &priv->pctl); + if (ret) { + dev_err(priv->dev, "pinctrl registration failed\n"); + return ret; + } + + ret = pinctrl_enable(priv->pctl); + if (ret) { + dev_err(priv->dev, "pinctrl enable failed\n"); + return ret; + } + + ret = rza2_gpio_register(priv); + if (ret) { + dev_err(priv->dev, "GPIO registration failed\n"); + return ret; + } + + return 0; +} + +/* + * For each DT node, create a single pin mapping. That pin mapping will only + * contain a single group of pins, and that group of pins will only have a + * single function that can be selected. + */ +static int rza2_dt_node_to_map(struct pinctrl_dev *pctldev, + struct device_node *np, + struct pinctrl_map **map, + unsigned int *num_maps) +{ + struct rza2_pinctrl_priv *priv = pinctrl_dev_get_drvdata(pctldev); + unsigned int *pins, *psel_val; + int i, ret, npins, gsel, fsel; + struct property *of_pins; + const char **pin_fn; + + /* Find out how many pins to map */ + of_pins = of_find_property(np, "pinmux", NULL); + if (!of_pins) { + dev_info(priv->dev, "Missing pinmux property\n"); + return -ENOENT; + } + npins = of_pins->length / sizeof(u32); + + pins = devm_kcalloc(priv->dev, npins, sizeof(*pins), GFP_KERNEL); + psel_val = devm_kcalloc(priv->dev, npins, sizeof(*psel_val), + GFP_KERNEL); + pin_fn = devm_kzalloc(priv->dev, sizeof(*pin_fn), GFP_KERNEL); + if (!pins || !psel_val || !pin_fn) + return -ENOMEM; + + /* Collect pin locations and mux settings from DT properties */ + for (i = 0; i < npins; ++i) { + u32 value; + + ret = of_property_read_u32_index(np, "pinmux", i, &value); + if (ret) + return ret; + pins[i] = value & MUX_PIN_ID_MASK; + psel_val[i] = MUX_FUNC(value); + } + + mutex_lock(&priv->mutex); + + /* Register a single pin group listing all the pins we read from DT */ + gsel = pinctrl_generic_add_group(pctldev, np->name, pins, npins, NULL); + if (gsel < 0) { + ret = gsel; + goto unlock; + } + + /* + * Register a single group function where the 'data' is an array PSEL + * register values read from DT. + */ + pin_fn[0] = np->name; + fsel = pinmux_generic_add_function(pctldev, np->name, pin_fn, 1, + psel_val); + if (fsel < 0) { + ret = fsel; + goto remove_group; + } + + dev_dbg(priv->dev, "Parsed %pOF with %d pins\n", np, npins); + + /* Create map where to retrieve function and mux settings from */ + *num_maps = 0; + *map = kzalloc(sizeof(**map), GFP_KERNEL); + if (!*map) { + ret = -ENOMEM; + goto remove_function; + } + + (*map)->type = PIN_MAP_TYPE_MUX_GROUP; + (*map)->data.mux.group = np->name; + (*map)->data.mux.function = np->name; + *num_maps = 1; + + mutex_unlock(&priv->mutex); + + return 0; + +remove_function: + pinmux_generic_remove_function(pctldev, fsel); + +remove_group: + pinctrl_generic_remove_group(pctldev, gsel); + +unlock: + mutex_unlock(&priv->mutex); + + dev_err(priv->dev, "Unable to parse DT node %s\n", np->name); + + return ret; +} + +static void rza2_dt_free_map(struct pinctrl_dev *pctldev, + struct pinctrl_map *map, unsigned int num_maps) +{ + kfree(map); +} + +static const struct pinctrl_ops rza2_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 = rza2_dt_node_to_map, + .dt_free_map = rza2_dt_free_map, +}; + +static int rza2_set_mux(struct pinctrl_dev *pctldev, unsigned int selector, + unsigned int group) +{ + struct rza2_pinctrl_priv *priv = pinctrl_dev_get_drvdata(pctldev); + struct function_desc *func; + unsigned int i, *psel_val; + struct group_desc *grp; + + grp = pinctrl_generic_get_group(pctldev, group); + if (!grp) + return -EINVAL; + + func = pinmux_generic_get_function(pctldev, selector); + if (!func) + return -EINVAL; + + psel_val = func->data; + + for (i = 0; i < grp->num_pins; ++i) { + dev_dbg(priv->dev, "Setting P%c_%d to PSEL=%d\n", + port_names[RZA2_PIN_ID_TO_PORT(grp->pins[i])], + RZA2_PIN_ID_TO_PIN(grp->pins[i]), + psel_val[i]); + rza2_set_pin_function( + priv->base, + RZA2_PIN_ID_TO_PORT(grp->pins[i]), + RZA2_PIN_ID_TO_PIN(grp->pins[i]), + psel_val[i]); + } + + return 0; +} + +static const struct pinmux_ops rza2_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 = rza2_set_mux, + .strict = true, +}; + +static int rza2_pinctrl_probe(struct platform_device *pdev) +{ + struct rza2_pinctrl_priv *priv; + int ret; + + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->dev = &pdev->dev; + + priv->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(priv->base)) + return PTR_ERR(priv->base); + + mutex_init(&priv->mutex); + + platform_set_drvdata(pdev, priv); + + priv->npins = (int)(uintptr_t)of_device_get_match_data(&pdev->dev) * + RZA2_PINS_PER_PORT; + + priv->desc.name = DRIVER_NAME; + priv->desc.pctlops = &rza2_pinctrl_ops; + priv->desc.pmxops = &rza2_pinmux_ops; + priv->desc.owner = THIS_MODULE; + + ret = rza2_pinctrl_register(priv); + if (ret) + return ret; + + dev_info(&pdev->dev, "Registered ports P0 - P%c\n", + port_names[priv->desc.npins / RZA2_PINS_PER_PORT - 1]); + + return 0; +} + +static const struct of_device_id rza2_pinctrl_of_match[] = { + { .compatible = "renesas,r7s9210-pinctrl", .data = (void *)22, }, + { /* sentinel */ } +}; + +static struct platform_driver rza2_pinctrl_driver = { + .driver = { + .name = DRIVER_NAME, + .of_match_table = rza2_pinctrl_of_match, + }, + .probe = rza2_pinctrl_probe, +}; + +static int __init rza2_pinctrl_init(void) +{ + return platform_driver_register(&rza2_pinctrl_driver); +} +core_initcall(rza2_pinctrl_init); + +MODULE_AUTHOR("Chris Brandt <chris.brandt@renesas.com>"); +MODULE_DESCRIPTION("Pin and gpio controller driver for RZ/A2 SoC"); +MODULE_LICENSE("GPL v2"); |