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Merge branch 'master' of git://git.denx.de/u-boot-x86
[u-boot] / drivers / misc / qfw.c
1 /*
2  * (C) Copyright 2015 Miao Yan <yanmiaobest@gmail.com>
3  *
4  * SPDX-License-Identifier:     GPL-2.0+
5  */
6
7 #include <common.h>
8 #include <command.h>
9 #include <errno.h>
10 #include <malloc.h>
11 #include <qfw.h>
12 #include <asm/io.h>
13 #ifdef CONFIG_GENERATE_ACPI_TABLE
14 #include <asm/tables.h>
15 #endif
16 #include <linux/list.h>
17
18 static bool fwcfg_present;
19 static bool fwcfg_dma_present;
20 static struct fw_cfg_arch_ops *fwcfg_arch_ops;
21
22 static LIST_HEAD(fw_list);
23
24 #ifdef CONFIG_GENERATE_ACPI_TABLE
25 /*
26  * This function allocates memory for ACPI tables
27  *
28  * @entry : BIOS linker command entry which tells where to allocate memory
29  *          (either high memory or low memory)
30  * @addr  : The address that should be used for low memory allcation. If the
31  *          memory allocation request is 'ZONE_HIGH' then this parameter will
32  *          be ignored.
33  * @return: 0 on success, or negative value on failure
34  */
35 static int bios_linker_allocate(struct bios_linker_entry *entry, u32 *addr)
36 {
37         uint32_t size, align;
38         struct fw_file *file;
39         unsigned long aligned_addr;
40
41         align = le32_to_cpu(entry->alloc.align);
42         /* align must be power of 2 */
43         if (align & (align - 1)) {
44                 printf("error: wrong alignment %u\n", align);
45                 return -EINVAL;
46         }
47
48         file = qemu_fwcfg_find_file(entry->alloc.file);
49         if (!file) {
50                 printf("error: can't find file %s\n", entry->alloc.file);
51                 return -ENOENT;
52         }
53
54         size = be32_to_cpu(file->cfg.size);
55
56         /*
57          * ZONE_HIGH means we need to allocate from high memory, since
58          * malloc space is already at the end of RAM, so we directly use it.
59          * If allocation zone is ZONE_FSEG, then we use the 'addr' passed
60          * in which is low memory
61          */
62         if (entry->alloc.zone == BIOS_LINKER_LOADER_ALLOC_ZONE_HIGH) {
63                 aligned_addr = (unsigned long)memalign(align, size);
64                 if (!aligned_addr) {
65                         printf("error: allocating resource\n");
66                         return -ENOMEM;
67                 }
68         } else if (entry->alloc.zone == BIOS_LINKER_LOADER_ALLOC_ZONE_FSEG) {
69                 aligned_addr = ALIGN(*addr, align);
70         } else {
71                 printf("error: invalid allocation zone\n");
72                 return -EINVAL;
73         }
74
75         debug("bios_linker_allocate: allocate file %s, size %u, zone %d, align %u, addr 0x%lx\n",
76               file->cfg.name, size, entry->alloc.zone, align, aligned_addr);
77
78         qemu_fwcfg_read_entry(be16_to_cpu(file->cfg.select),
79                               size, (void *)aligned_addr);
80         file->addr = aligned_addr;
81
82         /* adjust address for low memory allocation */
83         if (entry->alloc.zone == BIOS_LINKER_LOADER_ALLOC_ZONE_FSEG)
84                 *addr = (aligned_addr + size);
85
86         return 0;
87 }
88
89 /*
90  * This function patches ACPI tables previously loaded
91  * by bios_linker_allocate()
92  *
93  * @entry : BIOS linker command entry which tells how to patch
94  *          ACPI tables
95  * @return: 0 on success, or negative value on failure
96  */
97 static int bios_linker_add_pointer(struct bios_linker_entry *entry)
98 {
99         struct fw_file *dest, *src;
100         uint32_t offset = le32_to_cpu(entry->pointer.offset);
101         uint64_t pointer = 0;
102
103         dest = qemu_fwcfg_find_file(entry->pointer.dest_file);
104         if (!dest || !dest->addr)
105                 return -ENOENT;
106         src = qemu_fwcfg_find_file(entry->pointer.src_file);
107         if (!src || !src->addr)
108                 return -ENOENT;
109
110         debug("bios_linker_add_pointer: dest->addr 0x%lx, src->addr 0x%lx, offset 0x%x size %u, 0x%llx\n",
111               dest->addr, src->addr, offset, entry->pointer.size, pointer);
112
113         memcpy(&pointer, (char *)dest->addr + offset, entry->pointer.size);
114         pointer = le64_to_cpu(pointer);
115         pointer += (unsigned long)src->addr;
116         pointer = cpu_to_le64(pointer);
117         memcpy((char *)dest->addr + offset, &pointer, entry->pointer.size);
118
119         return 0;
120 }
121
122 /*
123  * This function updates checksum fields of ACPI tables previously loaded
124  * by bios_linker_allocate()
125  *
126  * @entry : BIOS linker command entry which tells where to update ACPI table
127  *          checksums
128  * @return: 0 on success, or negative value on failure
129  */
130 static int bios_linker_add_checksum(struct bios_linker_entry *entry)
131 {
132         struct fw_file *file;
133         uint8_t *data, cksum = 0;
134         uint8_t *cksum_start;
135
136         file = qemu_fwcfg_find_file(entry->cksum.file);
137         if (!file || !file->addr)
138                 return -ENOENT;
139
140         data = (uint8_t *)(file->addr + le32_to_cpu(entry->cksum.offset));
141         cksum_start = (uint8_t *)(file->addr + le32_to_cpu(entry->cksum.start));
142         cksum = table_compute_checksum(cksum_start,
143                                        le32_to_cpu(entry->cksum.length));
144         *data = cksum;
145
146         return 0;
147 }
148
149 /* This function loads and patches ACPI tables provided by QEMU */
150 u32 write_acpi_tables(u32 addr)
151 {
152         int i, ret = 0;
153         struct fw_file *file;
154         struct bios_linker_entry *table_loader;
155         struct bios_linker_entry *entry;
156         uint32_t size;
157
158         /* make sure fw_list is loaded */
159         ret = qemu_fwcfg_read_firmware_list();
160         if (ret) {
161                 printf("error: can't read firmware file list\n");
162                 return addr;
163         }
164
165         file = qemu_fwcfg_find_file("etc/table-loader");
166         if (!file) {
167                 printf("error: can't find etc/table-loader\n");
168                 return addr;
169         }
170
171         size = be32_to_cpu(file->cfg.size);
172         if ((size % sizeof(*entry)) != 0) {
173                 printf("error: table-loader maybe corrupted\n");
174                 return addr;
175         }
176
177         table_loader = malloc(size);
178         if (!table_loader) {
179                 printf("error: no memory for table-loader\n");
180                 return addr;
181         }
182
183         qemu_fwcfg_read_entry(be16_to_cpu(file->cfg.select),
184                               size, table_loader);
185
186         for (i = 0; i < (size / sizeof(*entry)); i++) {
187                 entry = table_loader + i;
188                 switch (le32_to_cpu(entry->command)) {
189                 case BIOS_LINKER_LOADER_COMMAND_ALLOCATE:
190                         ret = bios_linker_allocate(entry, &addr);
191                         if (ret)
192                                 goto out;
193                         break;
194                 case BIOS_LINKER_LOADER_COMMAND_ADD_POINTER:
195                         ret = bios_linker_add_pointer(entry);
196                         if (ret)
197                                 goto out;
198                         break;
199                 case BIOS_LINKER_LOADER_COMMAND_ADD_CHECKSUM:
200                         ret = bios_linker_add_checksum(entry);
201                         if (ret)
202                                 goto out;
203                         break;
204                 default:
205                         break;
206                 }
207         }
208
209 out:
210         if (ret) {
211                 struct fw_cfg_file_iter iter;
212                 for (file = qemu_fwcfg_file_iter_init(&iter);
213                      !qemu_fwcfg_file_iter_end(&iter);
214                      file = qemu_fwcfg_file_iter_next(&iter)) {
215                         if (file->addr) {
216                                 free((void *)file->addr);
217                                 file->addr = 0;
218                         }
219                 }
220         }
221
222         free(table_loader);
223         return addr;
224 }
225 #endif
226
227 /* Read configuration item using fw_cfg PIO interface */
228 static void qemu_fwcfg_read_entry_pio(uint16_t entry,
229                 uint32_t size, void *address)
230 {
231         debug("qemu_fwcfg_read_entry_pio: entry 0x%x, size %u address %p\n",
232               entry, size, address);
233
234         return fwcfg_arch_ops->arch_read_pio(entry, size, address);
235 }
236
237 /* Read configuration item using fw_cfg DMA interface */
238 static void qemu_fwcfg_read_entry_dma(uint16_t entry,
239                 uint32_t size, void *address)
240 {
241         struct fw_cfg_dma_access dma;
242
243         dma.length = cpu_to_be32(size);
244         dma.address = cpu_to_be64((uintptr_t)address);
245         dma.control = cpu_to_be32(FW_CFG_DMA_READ);
246
247         /*
248          * writting FW_CFG_INVALID will cause read operation to resume at
249          * last offset, otherwise read will start at offset 0
250          */
251         if (entry != FW_CFG_INVALID)
252                 dma.control |= cpu_to_be32(FW_CFG_DMA_SELECT | (entry << 16));
253
254         barrier();
255
256         debug("qemu_fwcfg_read_entry_dma: entry 0x%x, size %u address %p, control 0x%x\n",
257               entry, size, address, be32_to_cpu(dma.control));
258
259         fwcfg_arch_ops->arch_read_dma(&dma);
260 }
261
262 bool qemu_fwcfg_present(void)
263 {
264         return fwcfg_present;
265 }
266
267 bool qemu_fwcfg_dma_present(void)
268 {
269         return fwcfg_dma_present;
270 }
271
272 void qemu_fwcfg_read_entry(uint16_t entry, uint32_t length, void *address)
273 {
274         if (fwcfg_dma_present)
275                 qemu_fwcfg_read_entry_dma(entry, length, address);
276         else
277                 qemu_fwcfg_read_entry_pio(entry, length, address);
278 }
279
280 int qemu_fwcfg_online_cpus(void)
281 {
282         uint16_t nb_cpus;
283
284         if (!fwcfg_present)
285                 return -ENODEV;
286
287         qemu_fwcfg_read_entry(FW_CFG_NB_CPUS, 2, &nb_cpus);
288
289         return le16_to_cpu(nb_cpus);
290 }
291
292 int qemu_fwcfg_read_firmware_list(void)
293 {
294         int i;
295         uint32_t count;
296         struct fw_file *file;
297         struct list_head *entry;
298
299         /* don't read it twice */
300         if (!list_empty(&fw_list))
301                 return 0;
302
303         qemu_fwcfg_read_entry(FW_CFG_FILE_DIR, 4, &count);
304         if (!count)
305                 return 0;
306
307         count = be32_to_cpu(count);
308         for (i = 0; i < count; i++) {
309                 file = malloc(sizeof(*file));
310                 if (!file) {
311                         printf("error: allocating resource\n");
312                         goto err;
313                 }
314                 qemu_fwcfg_read_entry(FW_CFG_INVALID,
315                                       sizeof(struct fw_cfg_file), &file->cfg);
316                 file->addr = 0;
317                 list_add_tail(&file->list, &fw_list);
318         }
319
320         return 0;
321
322 err:
323         list_for_each(entry, &fw_list) {
324                 file = list_entry(entry, struct fw_file, list);
325                 free(file);
326         }
327
328         return -ENOMEM;
329 }
330
331 struct fw_file *qemu_fwcfg_find_file(const char *name)
332 {
333         struct list_head *entry;
334         struct fw_file *file;
335
336         list_for_each(entry, &fw_list) {
337                 file = list_entry(entry, struct fw_file, list);
338                 if (!strcmp(file->cfg.name, name))
339                         return file;
340         }
341
342         return NULL;
343 }
344
345 struct fw_file *qemu_fwcfg_file_iter_init(struct fw_cfg_file_iter *iter)
346 {
347         iter->entry = fw_list.next;
348         return list_entry((struct list_head *)iter->entry,
349                           struct fw_file, list);
350 }
351
352 struct fw_file *qemu_fwcfg_file_iter_next(struct fw_cfg_file_iter *iter)
353 {
354         iter->entry = ((struct list_head *)iter->entry)->next;
355         return list_entry((struct list_head *)iter->entry,
356                           struct fw_file, list);
357 }
358
359 bool qemu_fwcfg_file_iter_end(struct fw_cfg_file_iter *iter)
360 {
361         return iter->entry == &fw_list;
362 }
363
364 void qemu_fwcfg_init(struct fw_cfg_arch_ops *ops)
365 {
366         uint32_t qemu;
367         uint32_t dma_enabled;
368
369         fwcfg_present = false;
370         fwcfg_dma_present = false;
371         fwcfg_arch_ops = NULL;
372
373         if (!ops || !ops->arch_read_pio || !ops->arch_read_dma)
374                 return;
375         fwcfg_arch_ops = ops;
376
377         qemu_fwcfg_read_entry_pio(FW_CFG_SIGNATURE, 4, &qemu);
378         if (be32_to_cpu(qemu) == QEMU_FW_CFG_SIGNATURE)
379                 fwcfg_present = true;
380
381         if (fwcfg_present) {
382                 qemu_fwcfg_read_entry_pio(FW_CFG_ID, 1, &dma_enabled);
383                 if (dma_enabled & FW_CFG_DMA_ENABLED)
384                         fwcfg_dma_present = true;
385         }
386 }