qfw.c 8.0 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319
  1. // SPDX-License-Identifier: GPL-2.0+
  2. /*
  3. * (C) Copyright 2015 Miao Yan <yanmiaobest@gmail.com>
  4. * (C) Copyright 2021 Asherah Connor <ashe@kivikakk.ee>
  5. */
  6. #define LOG_CATEGORY UCLASS_QFW
  7. #include <common.h>
  8. #include <command.h>
  9. #include <errno.h>
  10. #include <log.h>
  11. #include <malloc.h>
  12. #include <qfw.h>
  13. #include <dm.h>
  14. #include <misc.h>
  15. #ifdef CONFIG_GENERATE_ACPI_TABLE
  16. #include <asm/tables.h>
  17. #endif
  18. #ifdef CONFIG_GENERATE_ACPI_TABLE
  19. /*
  20. * This function allocates memory for ACPI tables
  21. *
  22. * @entry : BIOS linker command entry which tells where to allocate memory
  23. * (either high memory or low memory)
  24. * @addr : The address that should be used for low memory allcation. If the
  25. * memory allocation request is 'ZONE_HIGH' then this parameter will
  26. * be ignored.
  27. * @return: 0 on success, or negative value on failure
  28. */
  29. static int bios_linker_allocate(struct udevice *dev,
  30. struct bios_linker_entry *entry, ulong *addr)
  31. {
  32. uint32_t size, align;
  33. struct fw_file *file;
  34. unsigned long aligned_addr;
  35. align = le32_to_cpu(entry->alloc.align);
  36. /* align must be power of 2 */
  37. if (align & (align - 1)) {
  38. printf("error: wrong alignment %u\n", align);
  39. return -EINVAL;
  40. }
  41. file = qfw_find_file(dev, entry->alloc.file);
  42. if (!file) {
  43. printf("error: can't find file %s\n", entry->alloc.file);
  44. return -ENOENT;
  45. }
  46. size = be32_to_cpu(file->cfg.size);
  47. /*
  48. * ZONE_HIGH means we need to allocate from high memory, since
  49. * malloc space is already at the end of RAM, so we directly use it.
  50. * If allocation zone is ZONE_FSEG, then we use the 'addr' passed
  51. * in which is low memory
  52. */
  53. if (entry->alloc.zone == BIOS_LINKER_LOADER_ALLOC_ZONE_HIGH) {
  54. aligned_addr = (unsigned long)memalign(align, size);
  55. if (!aligned_addr) {
  56. printf("error: allocating resource\n");
  57. return -ENOMEM;
  58. }
  59. } else if (entry->alloc.zone == BIOS_LINKER_LOADER_ALLOC_ZONE_FSEG) {
  60. aligned_addr = ALIGN(*addr, align);
  61. } else {
  62. printf("error: invalid allocation zone\n");
  63. return -EINVAL;
  64. }
  65. debug("bios_linker_allocate: allocate file %s, size %u, zone %d, align %u, addr 0x%lx\n",
  66. file->cfg.name, size, entry->alloc.zone, align, aligned_addr);
  67. qfw_read_entry(dev, be16_to_cpu(file->cfg.select), size,
  68. (void *)aligned_addr);
  69. file->addr = aligned_addr;
  70. /* adjust address for low memory allocation */
  71. if (entry->alloc.zone == BIOS_LINKER_LOADER_ALLOC_ZONE_FSEG)
  72. *addr = (aligned_addr + size);
  73. return 0;
  74. }
  75. /*
  76. * This function patches ACPI tables previously loaded
  77. * by bios_linker_allocate()
  78. *
  79. * @entry : BIOS linker command entry which tells how to patch
  80. * ACPI tables
  81. * @return: 0 on success, or negative value on failure
  82. */
  83. static int bios_linker_add_pointer(struct udevice *dev,
  84. struct bios_linker_entry *entry)
  85. {
  86. struct fw_file *dest, *src;
  87. uint32_t offset = le32_to_cpu(entry->pointer.offset);
  88. uint64_t pointer = 0;
  89. dest = qfw_find_file(dev, entry->pointer.dest_file);
  90. if (!dest || !dest->addr)
  91. return -ENOENT;
  92. src = qfw_find_file(dev, entry->pointer.src_file);
  93. if (!src || !src->addr)
  94. return -ENOENT;
  95. debug("bios_linker_add_pointer: dest->addr 0x%lx, src->addr 0x%lx, offset 0x%x size %u, 0x%llx\n",
  96. dest->addr, src->addr, offset, entry->pointer.size, pointer);
  97. memcpy(&pointer, (char *)dest->addr + offset, entry->pointer.size);
  98. pointer = le64_to_cpu(pointer);
  99. pointer += (unsigned long)src->addr;
  100. pointer = cpu_to_le64(pointer);
  101. memcpy((char *)dest->addr + offset, &pointer, entry->pointer.size);
  102. return 0;
  103. }
  104. /*
  105. * This function updates checksum fields of ACPI tables previously loaded
  106. * by bios_linker_allocate()
  107. *
  108. * @entry : BIOS linker command entry which tells where to update ACPI table
  109. * checksums
  110. * @return: 0 on success, or negative value on failure
  111. */
  112. static int bios_linker_add_checksum(struct udevice *dev,
  113. struct bios_linker_entry *entry)
  114. {
  115. struct fw_file *file;
  116. uint8_t *data, cksum = 0;
  117. uint8_t *cksum_start;
  118. file = qfw_find_file(dev, entry->cksum.file);
  119. if (!file || !file->addr)
  120. return -ENOENT;
  121. data = (uint8_t *)(file->addr + le32_to_cpu(entry->cksum.offset));
  122. cksum_start = (uint8_t *)(file->addr + le32_to_cpu(entry->cksum.start));
  123. cksum = table_compute_checksum(cksum_start,
  124. le32_to_cpu(entry->cksum.length));
  125. *data = cksum;
  126. return 0;
  127. }
  128. /* This function loads and patches ACPI tables provided by QEMU */
  129. ulong write_acpi_tables(ulong addr)
  130. {
  131. int i, ret;
  132. struct fw_file *file;
  133. struct bios_linker_entry *table_loader;
  134. struct bios_linker_entry *entry;
  135. uint32_t size;
  136. struct udevice *dev;
  137. ret = qfw_get_dev(&dev);
  138. if (ret) {
  139. printf("error: no qfw\n");
  140. return addr;
  141. }
  142. /* make sure fw_list is loaded */
  143. ret = qfw_read_firmware_list(dev);
  144. if (ret) {
  145. printf("error: can't read firmware file list\n");
  146. return addr;
  147. }
  148. file = qfw_find_file(dev, "etc/table-loader");
  149. if (!file) {
  150. printf("error: can't find etc/table-loader\n");
  151. return addr;
  152. }
  153. size = be32_to_cpu(file->cfg.size);
  154. if ((size % sizeof(*entry)) != 0) {
  155. printf("error: table-loader maybe corrupted\n");
  156. return addr;
  157. }
  158. table_loader = malloc(size);
  159. if (!table_loader) {
  160. printf("error: no memory for table-loader\n");
  161. return addr;
  162. }
  163. qfw_read_entry(dev, be16_to_cpu(file->cfg.select), size, table_loader);
  164. for (i = 0; i < (size / sizeof(*entry)); i++) {
  165. entry = table_loader + i;
  166. switch (le32_to_cpu(entry->command)) {
  167. case BIOS_LINKER_LOADER_COMMAND_ALLOCATE:
  168. ret = bios_linker_allocate(dev, entry, &addr);
  169. if (ret)
  170. goto out;
  171. break;
  172. case BIOS_LINKER_LOADER_COMMAND_ADD_POINTER:
  173. ret = bios_linker_add_pointer(dev, entry);
  174. if (ret)
  175. goto out;
  176. break;
  177. case BIOS_LINKER_LOADER_COMMAND_ADD_CHECKSUM:
  178. ret = bios_linker_add_checksum(dev, entry);
  179. if (ret)
  180. goto out;
  181. break;
  182. default:
  183. break;
  184. }
  185. }
  186. out:
  187. if (ret) {
  188. struct fw_cfg_file_iter iter;
  189. for (file = qfw_file_iter_init(dev, &iter);
  190. !qfw_file_iter_end(&iter);
  191. file = qfw_file_iter_next(&iter)) {
  192. if (file->addr) {
  193. free((void *)file->addr);
  194. file->addr = 0;
  195. }
  196. }
  197. }
  198. free(table_loader);
  199. return addr;
  200. }
  201. ulong acpi_get_rsdp_addr(void)
  202. {
  203. int ret;
  204. struct fw_file *file;
  205. struct udevice *dev;
  206. ret = qfw_get_dev(&dev);
  207. if (ret) {
  208. printf("error: no qfw\n");
  209. return 0;
  210. }
  211. file = qfw_find_file(dev, "etc/acpi/rsdp");
  212. return file->addr;
  213. }
  214. #endif
  215. static void qfw_read_entry_io(struct qfw_dev *qdev, u16 entry, u32 size,
  216. void *address)
  217. {
  218. struct dm_qfw_ops *ops = dm_qfw_get_ops(qdev->dev);
  219. debug("%s: entry 0x%x, size %u address %p\n", __func__, entry, size,
  220. address);
  221. ops->read_entry_io(qdev->dev, entry, size, address);
  222. }
  223. static void qfw_read_entry_dma(struct qfw_dev *qdev, u16 entry, u32 size,
  224. void *address)
  225. {
  226. struct dm_qfw_ops *ops = dm_qfw_get_ops(qdev->dev);
  227. struct qfw_dma dma = {
  228. .length = cpu_to_be32(size),
  229. .address = cpu_to_be64((uintptr_t)address),
  230. .control = cpu_to_be32(FW_CFG_DMA_READ),
  231. };
  232. /*
  233. * writing FW_CFG_INVALID will cause read operation to resume at last
  234. * offset, otherwise read will start at offset 0
  235. */
  236. if (entry != FW_CFG_INVALID)
  237. dma.control |= cpu_to_be32(FW_CFG_DMA_SELECT | (entry << 16));
  238. debug("%s: entry 0x%x, size %u address %p, control 0x%x\n", __func__,
  239. entry, size, address, be32_to_cpu(dma.control));
  240. barrier();
  241. ops->read_entry_dma(qdev->dev, &dma);
  242. }
  243. void qfw_read_entry(struct udevice *dev, u16 entry, u32 size, void *address)
  244. {
  245. struct qfw_dev *qdev = dev_get_uclass_priv(dev);
  246. if (qdev->dma_present)
  247. qfw_read_entry_dma(qdev, entry, size, address);
  248. else
  249. qfw_read_entry_io(qdev, entry, size, address);
  250. }
  251. int qfw_register(struct udevice *dev)
  252. {
  253. struct qfw_dev *qdev = dev_get_uclass_priv(dev);
  254. u32 qemu, dma_enabled;
  255. qdev->dev = dev;
  256. INIT_LIST_HEAD(&qdev->fw_list);
  257. qfw_read_entry_io(qdev, FW_CFG_SIGNATURE, 4, &qemu);
  258. if (be32_to_cpu(qemu) != QEMU_FW_CFG_SIGNATURE)
  259. return -ENODEV;
  260. qfw_read_entry_io(qdev, FW_CFG_ID, 1, &dma_enabled);
  261. if (dma_enabled & FW_CFG_DMA_ENABLED)
  262. qdev->dma_present = true;
  263. return 0;
  264. }
  265. UCLASS_DRIVER(qfw) = {
  266. .id = UCLASS_QFW,
  267. .name = "qfw",
  268. .per_device_auto = sizeof(struct qfw_dev),
  269. };