Mark Kettenis | c932976 | 2021-11-02 18:21:57 +0100 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0+ |
| 2 | /* |
| 3 | * (C) Copyright 2021 Mark Kettenis <kettenis@openbsd.org> |
| 4 | */ |
| 5 | |
Mark Kettenis | c932976 | 2021-11-02 18:21:57 +0100 | [diff] [blame] | 6 | #include <dm.h> |
| 7 | #include <dm/device-internal.h> |
| 8 | #include <dm/pinctrl.h> |
| 9 | #include <dt-bindings/pinctrl/apple.h> |
| 10 | #include <asm/io.h> |
| 11 | #include <asm-generic/gpio.h> |
| 12 | #include <linux/bitfield.h> |
| 13 | |
| 14 | struct apple_pinctrl_priv { |
| 15 | void *base; |
| 16 | int pin_count; |
| 17 | }; |
| 18 | |
| 19 | #define REG_GPIO(x) (4 * (x)) |
| 20 | #define REG_GPIO_DATA BIT(0) |
| 21 | #define REG_GPIO_MODE GENMASK(3, 1) |
| 22 | #define REG_GPIO_OUT 1 |
| 23 | #define REG_GPIO_PERIPH GENMASK(6, 5) |
| 24 | #define REG_GPIO_INPUT_ENABLE BIT(9) |
| 25 | |
| 26 | static void apple_pinctrl_config_pin(struct apple_pinctrl_priv *priv, |
| 27 | unsigned pin, u32 clr, u32 set) |
| 28 | { |
| 29 | unsigned reg = REG_GPIO(pin); |
| 30 | u32 old, new; |
| 31 | |
| 32 | old = readl(priv->base + REG_GPIO(pin)); |
| 33 | new = (old & ~clr) | set; |
| 34 | writel(new, priv->base + reg); |
| 35 | } |
| 36 | |
| 37 | static int apple_gpio_get_value(struct udevice *dev, unsigned offset) |
| 38 | { |
| 39 | struct apple_pinctrl_priv *priv = dev_get_priv(dev->parent); |
| 40 | |
| 41 | return !!(readl(priv->base + REG_GPIO(offset)) & REG_GPIO_DATA); |
| 42 | } |
| 43 | |
| 44 | static int apple_gpio_set_value(struct udevice *dev, unsigned offset, |
| 45 | int value) |
| 46 | { |
| 47 | struct apple_pinctrl_priv *priv = dev_get_priv(dev->parent); |
| 48 | |
| 49 | apple_pinctrl_config_pin(priv, offset, REG_GPIO_DATA, |
| 50 | value ? REG_GPIO_DATA : 0); |
| 51 | return 0; |
| 52 | } |
| 53 | |
| 54 | static int apple_gpio_get_direction(struct udevice *dev, unsigned offset) |
| 55 | { |
| 56 | struct apple_pinctrl_priv *priv = dev_get_priv(dev->parent); |
| 57 | u32 reg = readl(priv->base + REG_GPIO(offset)); |
| 58 | |
| 59 | if (FIELD_GET(REG_GPIO_MODE, reg) == REG_GPIO_OUT) |
| 60 | return GPIOF_OUTPUT; |
| 61 | else |
| 62 | return GPIOF_INPUT; |
| 63 | } |
| 64 | |
| 65 | static int apple_gpio_direction_input(struct udevice *dev, unsigned offset) |
| 66 | { |
| 67 | struct apple_pinctrl_priv *priv = dev_get_priv(dev->parent); |
| 68 | |
| 69 | apple_pinctrl_config_pin(priv, offset, |
| 70 | REG_GPIO_PERIPH | REG_GPIO_MODE, |
| 71 | REG_GPIO_INPUT_ENABLE); |
| 72 | return 0; |
| 73 | } |
| 74 | |
| 75 | static int apple_gpio_direction_output(struct udevice *dev, unsigned offset, |
| 76 | int value) |
| 77 | { |
| 78 | struct apple_pinctrl_priv *priv = dev_get_priv(dev->parent); |
| 79 | u32 set = (value ? REG_GPIO_DATA : 0); |
| 80 | |
| 81 | apple_pinctrl_config_pin(priv, offset, REG_GPIO_DATA | |
| 82 | REG_GPIO_PERIPH | REG_GPIO_MODE, |
| 83 | set | FIELD_PREP(REG_GPIO_MODE, REG_GPIO_OUT)); |
| 84 | return 0; |
| 85 | } |
| 86 | |
| 87 | static int apple_gpio_probe(struct udevice *dev) |
| 88 | { |
| 89 | struct apple_pinctrl_priv *priv = dev_get_priv(dev->parent); |
| 90 | struct gpio_dev_priv *uc_priv; |
| 91 | |
| 92 | uc_priv = dev_get_uclass_priv(dev); |
| 93 | uc_priv->bank_name = "gpio"; |
| 94 | uc_priv->gpio_count = priv->pin_count; |
| 95 | |
| 96 | return 0; |
| 97 | } |
| 98 | |
| 99 | static struct dm_gpio_ops apple_gpio_ops = { |
| 100 | .get_value = apple_gpio_get_value, |
| 101 | .set_value = apple_gpio_set_value, |
| 102 | .get_function = apple_gpio_get_direction, |
| 103 | .direction_input = apple_gpio_direction_input, |
| 104 | .direction_output = apple_gpio_direction_output, |
| 105 | }; |
| 106 | |
| 107 | static struct driver apple_gpio_driver = { |
| 108 | .name = "apple_gpio", |
| 109 | .id = UCLASS_GPIO, |
| 110 | .probe = apple_gpio_probe, |
| 111 | .ops = &apple_gpio_ops, |
| 112 | }; |
| 113 | |
| 114 | static int apple_pinctrl_get_pins_count(struct udevice *dev) |
| 115 | { |
| 116 | struct apple_pinctrl_priv *priv = dev_get_priv(dev); |
| 117 | |
| 118 | return priv->pin_count; |
| 119 | } |
| 120 | |
| 121 | static const char *apple_pinctrl_get_pin_name(struct udevice *dev, |
| 122 | unsigned selector) |
| 123 | { |
| 124 | static char pin_name[PINNAME_SIZE]; |
| 125 | |
| 126 | snprintf(pin_name, PINNAME_SIZE, "pin%d", selector); |
| 127 | return pin_name; |
| 128 | } |
| 129 | |
| 130 | static int apple_pinctrl_get_pin_muxing(struct udevice *dev, unsigned selector, |
| 131 | char *buf, int size) |
| 132 | { |
| 133 | struct apple_pinctrl_priv *priv = dev_get_priv(dev); |
| 134 | |
| 135 | if (readl(priv->base + REG_GPIO(selector)) & REG_GPIO_PERIPH) |
| 136 | strncpy(buf, "periph", size); |
| 137 | else |
| 138 | strncpy(buf, "gpio", size); |
| 139 | return 0; |
| 140 | } |
| 141 | |
| 142 | static int apple_pinctrl_pinmux_set(struct udevice *dev, unsigned pin_selector, |
| 143 | unsigned func_selector) |
| 144 | { |
| 145 | struct apple_pinctrl_priv *priv = dev_get_priv(dev); |
| 146 | |
| 147 | apple_pinctrl_config_pin(priv, pin_selector, |
| 148 | REG_GPIO_DATA | REG_GPIO_MODE, |
| 149 | FIELD_PREP(REG_GPIO_PERIPH, func_selector) | |
| 150 | REG_GPIO_INPUT_ENABLE); |
| 151 | return 0; |
| 152 | } |
| 153 | |
| 154 | static int apple_pinctrl_pinmux_property_set(struct udevice *dev, |
| 155 | u32 pinmux_group) |
| 156 | { |
| 157 | unsigned pin_selector = APPLE_PIN(pinmux_group); |
| 158 | unsigned func_selector = APPLE_FUNC(pinmux_group); |
| 159 | int ret; |
| 160 | |
| 161 | ret = apple_pinctrl_pinmux_set(dev, pin_selector, func_selector); |
| 162 | return ret ? ret : pin_selector; |
| 163 | } |
| 164 | |
| 165 | static int apple_pinctrl_probe(struct udevice *dev) |
| 166 | { |
| 167 | struct apple_pinctrl_priv *priv = dev_get_priv(dev); |
| 168 | struct ofnode_phandle_args args; |
| 169 | struct udevice *child; |
| 170 | |
| 171 | priv->base = dev_read_addr_ptr(dev); |
| 172 | if (!priv->base) |
| 173 | return -EINVAL; |
| 174 | |
| 175 | if (!dev_read_phandle_with_args(dev, "gpio-ranges", |
| 176 | NULL, 3, 0, &args)) |
| 177 | priv->pin_count = args.args[2]; |
| 178 | |
| 179 | device_bind(dev, &apple_gpio_driver, "apple_gpio", NULL, |
| 180 | dev_ofnode(dev), &child); |
| 181 | |
| 182 | return 0; |
| 183 | } |
| 184 | |
| 185 | static struct pinctrl_ops apple_pinctrl_ops = { |
| 186 | .set_state = pinctrl_generic_set_state, |
| 187 | .get_pins_count = apple_pinctrl_get_pins_count, |
| 188 | .get_pin_name = apple_pinctrl_get_pin_name, |
| 189 | .pinmux_set = apple_pinctrl_pinmux_set, |
| 190 | .pinmux_property_set = apple_pinctrl_pinmux_property_set, |
| 191 | .get_pin_muxing = apple_pinctrl_get_pin_muxing, |
| 192 | }; |
| 193 | |
| 194 | static const struct udevice_id apple_pinctrl_ids[] = { |
| 195 | { .compatible = "apple,pinctrl" }, |
| 196 | { /* sentinel */ } |
| 197 | }; |
| 198 | |
| 199 | U_BOOT_DRIVER(pinctrl_apple) = { |
| 200 | .name = "apple_pinctrl", |
| 201 | .id = UCLASS_PINCTRL, |
| 202 | .of_match = apple_pinctrl_ids, |
| 203 | .priv_auto = sizeof(struct apple_pinctrl_priv), |
| 204 | .ops = &apple_pinctrl_ops, |
| 205 | .probe = apple_pinctrl_probe, |
| 206 | }; |