AKASHI Takahiro | 43855fd | 2022-04-19 10:05:09 +0900 | [diff] [blame^] | 1 | // SPDX-License-Identifier: GPL-2.0+ |
| 2 | /* |
| 3 | * Software partition device (UCLASS_PARTITION) |
| 4 | * |
| 5 | * Copyright (c) 2021 Linaro Limited |
| 6 | * Author: AKASHI Takahiro |
| 7 | */ |
| 8 | |
| 9 | #define LOG_CATEGORY UCLASS_PARTITION |
| 10 | |
| 11 | #include <blk.h> |
| 12 | #include <dm.h> |
| 13 | #include <log.h> |
| 14 | #include <part.h> |
| 15 | #include <vsprintf.h> |
| 16 | #include <dm/device-internal.h> |
| 17 | #include <dm/lists.h> |
| 18 | |
| 19 | int part_create_block_devices(struct udevice *blk_dev) |
| 20 | { |
| 21 | int part, count; |
| 22 | struct blk_desc *desc = dev_get_uclass_plat(blk_dev); |
| 23 | struct disk_partition info; |
| 24 | struct disk_part *part_data; |
| 25 | char devname[32]; |
| 26 | struct udevice *dev; |
| 27 | int ret; |
| 28 | |
| 29 | if (!CONFIG_IS_ENABLED(PARTITIONS) || |
| 30 | !CONFIG_IS_ENABLED(HAVE_BLOCK_DEVICE)) |
| 31 | return 0; |
| 32 | |
| 33 | if (device_get_uclass_id(blk_dev) != UCLASS_BLK) |
| 34 | return 0; |
| 35 | |
| 36 | /* Add devices for each partition */ |
| 37 | for (count = 0, part = 1; part <= MAX_SEARCH_PARTITIONS; part++) { |
| 38 | if (part_get_info(desc, part, &info)) |
| 39 | continue; |
| 40 | snprintf(devname, sizeof(devname), "%s:%d", blk_dev->name, |
| 41 | part); |
| 42 | |
| 43 | ret = device_bind_driver(blk_dev, "blk_partition", |
| 44 | strdup(devname), &dev); |
| 45 | if (ret) |
| 46 | return ret; |
| 47 | |
| 48 | part_data = dev_get_uclass_plat(dev); |
| 49 | part_data->partnum = part; |
| 50 | part_data->gpt_part_info = info; |
| 51 | count++; |
| 52 | |
| 53 | ret = device_probe(dev); |
| 54 | if (ret) { |
| 55 | debug("Can't probe\n"); |
| 56 | count--; |
| 57 | device_unbind(dev); |
| 58 | |
| 59 | continue; |
| 60 | } |
| 61 | } |
| 62 | debug("%s: %d partitions found in %s\n", __func__, count, |
| 63 | blk_dev->name); |
| 64 | |
| 65 | return 0; |
| 66 | } |
| 67 | |
| 68 | static ulong blk_part_read(struct udevice *dev, lbaint_t start, |
| 69 | lbaint_t blkcnt, void *buffer) |
| 70 | { |
| 71 | struct udevice *parent; |
| 72 | struct disk_part *part; |
| 73 | const struct blk_ops *ops; |
| 74 | |
| 75 | parent = dev_get_parent(dev); |
| 76 | ops = blk_get_ops(parent); |
| 77 | if (!ops->read) |
| 78 | return -ENOSYS; |
| 79 | |
| 80 | part = dev_get_uclass_plat(dev); |
| 81 | if (start >= part->gpt_part_info.size) |
| 82 | return 0; |
| 83 | |
| 84 | if ((start + blkcnt) > part->gpt_part_info.size) |
| 85 | blkcnt = part->gpt_part_info.size - start; |
| 86 | start += part->gpt_part_info.start; |
| 87 | |
| 88 | return ops->read(parent, start, blkcnt, buffer); |
| 89 | } |
| 90 | |
| 91 | static ulong blk_part_write(struct udevice *dev, lbaint_t start, |
| 92 | lbaint_t blkcnt, const void *buffer) |
| 93 | { |
| 94 | struct udevice *parent; |
| 95 | struct disk_part *part; |
| 96 | const struct blk_ops *ops; |
| 97 | |
| 98 | parent = dev_get_parent(dev); |
| 99 | ops = blk_get_ops(parent); |
| 100 | if (!ops->write) |
| 101 | return -ENOSYS; |
| 102 | |
| 103 | part = dev_get_uclass_plat(dev); |
| 104 | if (start >= part->gpt_part_info.size) |
| 105 | return 0; |
| 106 | |
| 107 | if ((start + blkcnt) > part->gpt_part_info.size) |
| 108 | blkcnt = part->gpt_part_info.size - start; |
| 109 | start += part->gpt_part_info.start; |
| 110 | |
| 111 | return ops->write(parent, start, blkcnt, buffer); |
| 112 | } |
| 113 | |
| 114 | static ulong blk_part_erase(struct udevice *dev, lbaint_t start, |
| 115 | lbaint_t blkcnt) |
| 116 | { |
| 117 | struct udevice *parent; |
| 118 | struct disk_part *part; |
| 119 | const struct blk_ops *ops; |
| 120 | |
| 121 | parent = dev_get_parent(dev); |
| 122 | ops = blk_get_ops(parent); |
| 123 | if (!ops->erase) |
| 124 | return -ENOSYS; |
| 125 | |
| 126 | part = dev_get_uclass_plat(dev); |
| 127 | if (start >= part->gpt_part_info.size) |
| 128 | return 0; |
| 129 | |
| 130 | if ((start + blkcnt) > part->gpt_part_info.size) |
| 131 | blkcnt = part->gpt_part_info.size - start; |
| 132 | start += part->gpt_part_info.start; |
| 133 | |
| 134 | return ops->erase(parent, start, blkcnt); |
| 135 | } |
| 136 | |
| 137 | static const struct blk_ops blk_part_ops = { |
| 138 | .read = blk_part_read, |
| 139 | .write = blk_part_write, |
| 140 | .erase = blk_part_erase, |
| 141 | }; |
| 142 | |
| 143 | U_BOOT_DRIVER(blk_partition) = { |
| 144 | .name = "blk_partition", |
| 145 | .id = UCLASS_PARTITION, |
| 146 | .ops = &blk_part_ops, |
| 147 | }; |
| 148 | |
| 149 | UCLASS_DRIVER(partition) = { |
| 150 | .id = UCLASS_PARTITION, |
| 151 | .per_device_plat_auto = sizeof(struct disk_part), |
| 152 | .name = "partition", |
| 153 | }; |