| Nandor Han | 6521e5d | 2021-06-10 16:56:44 +0300 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0+ |
| 2 | /* |
| 3 | * Copyright (c), Vaisala Oyj |
| 4 | */ |
| 5 | |
| Nandor Han | 6521e5d | 2021-06-10 16:56:44 +0300 | [diff] [blame] | 6 | #include <asm/gpio.h> |
| 7 | #include <dm.h> |
| 8 | #include <dm/devres.h> |
| 9 | #include <errno.h> |
| 10 | #include <reboot-mode/reboot-mode-gpio.h> |
| 11 | #include <reboot-mode/reboot-mode.h> |
| 12 | |
| 13 | DECLARE_GLOBAL_DATA_PTR; |
| 14 | |
| 15 | static int reboot_mode_get(struct udevice *dev, u32 *buf) |
| 16 | { |
| 17 | int ret; |
| 18 | struct reboot_mode_gpio_platdata *plat_data; |
| 19 | |
| 20 | if (!buf) |
| 21 | return -EINVAL; |
| 22 | |
| 23 | plat_data = dev_get_plat(dev); |
| 24 | if (!plat_data) |
| 25 | return -EINVAL; |
| 26 | |
| 27 | ret = dm_gpio_get_values_as_int(plat_data->gpio_desc, |
| 28 | plat_data->gpio_count); |
| 29 | if (ret < 0) |
| 30 | return ret; |
| 31 | |
| 32 | *buf = ret; |
| 33 | |
| 34 | return 0; |
| 35 | } |
| 36 | |
| 37 | static int reboot_mode_probe(struct udevice *dev) |
| 38 | { |
| 39 | struct reboot_mode_gpio_platdata *plat_data; |
| 40 | |
| 41 | plat_data = dev_get_plat(dev); |
| 42 | if (!plat_data) |
| 43 | return -EINVAL; |
| 44 | |
| 45 | int ret; |
| 46 | |
| 47 | #if CONFIG_IS_ENABLED(OF_CONTROL) |
| 48 | ret = gpio_get_list_count(dev, "gpios"); |
| 49 | if (ret < 0) |
| 50 | return ret; |
| 51 | |
| 52 | plat_data->gpio_count = ret; |
| 53 | #endif |
| 54 | |
| 55 | if (plat_data->gpio_count <= 0) |
| 56 | return -EINVAL; |
| 57 | |
| 58 | plat_data->gpio_desc = devm_kcalloc(dev, plat_data->gpio_count, |
| 59 | sizeof(struct gpio_desc), 0); |
| 60 | if (!plat_data->gpio_desc) |
| 61 | return -ENOMEM; |
| 62 | |
| 63 | #if CONFIG_IS_ENABLED(OF_CONTROL) |
| 64 | ret = gpio_request_list_by_name(dev, "gpios", plat_data->gpio_desc, |
| 65 | plat_data->gpio_count, GPIOD_IS_IN); |
| 66 | if (ret < 0) |
| 67 | return ret; |
| 68 | #else |
| 69 | for (int i = 0; i < plat_data->gpio_count; i++) { |
| 70 | struct reboot_mode_gpio_config *gpio = |
| 71 | plat_data->gpios_config + i; |
| 72 | struct gpio_desc *desc = plat_data->gpio_desc + i; |
| 73 | |
| 74 | ret = uclass_get_device_by_seq(UCLASS_GPIO, |
| 75 | gpio->gpio_dev_offset, |
| 76 | &desc->dev); |
| 77 | if (ret < 0) |
| 78 | return ret; |
| 79 | |
| 80 | desc->flags = gpio->flags; |
| 81 | desc->offset = gpio->gpio_offset; |
| 82 | |
| 83 | ret = dm_gpio_request(desc, ""); |
| 84 | if (ret < 0) |
| 85 | return ret; |
| 86 | |
| 87 | ret = dm_gpio_set_dir(desc); |
| 88 | if (ret < 0) |
| 89 | return ret; |
| 90 | } |
| 91 | #endif |
| 92 | return 0; |
| 93 | } |
| 94 | |
| 95 | static int reboot_mode_remove(struct udevice *dev) |
| 96 | { |
| 97 | struct reboot_mode_gpio_platdata *plat_data; |
| 98 | |
| 99 | plat_data = dev_get_plat(dev); |
| 100 | if (!plat_data) |
| 101 | return -EINVAL; |
| 102 | |
| 103 | return gpio_free_list(dev, plat_data->gpio_desc, plat_data->gpio_count); |
| 104 | } |
| 105 | |
| 106 | #if CONFIG_IS_ENABLED(OF_CONTROL) |
| 107 | static const struct udevice_id reboot_mode_ids[] = { |
| 108 | { .compatible = "reboot-mode-gpio", 0 }, |
| 109 | { } |
| 110 | }; |
| 111 | #endif |
| 112 | |
| 113 | static const struct reboot_mode_ops reboot_mode_gpio_ops = { |
| 114 | .get = reboot_mode_get, |
| 115 | }; |
| 116 | |
| 117 | U_BOOT_DRIVER(reboot_mode_gpio) = { |
| 118 | .name = "reboot-mode-gpio", |
| 119 | .id = UCLASS_REBOOT_MODE, |
| 120 | .probe = reboot_mode_probe, |
| 121 | .remove = reboot_mode_remove, |
| 122 | #if CONFIG_IS_ENABLED(OF_CONTROL) |
| 123 | .of_match = reboot_mode_ids, |
| 124 | #endif |
| 125 | .plat_auto = sizeof(struct reboot_mode_gpio_platdata), |
| 126 | .ops = &reboot_mode_gpio_ops, |
| 127 | }; |