1 // SPDX-License-Identifier: GPL-2.0
3 * From coreboot src/southbridge/intel/bd82x6x/mrccache.c
5 * Copyright (C) 2014 Google Inc.
6 * Copyright (C) 2015 Bin Meng <bmeng.cn@gmail.com>
15 #include <spi_flash.h>
16 #include <asm/mrccache.h>
18 DECLARE_GLOBAL_DATA_PTR;
20 static struct mrc_data_container *next_mrc_block(
21 struct mrc_data_container *cache)
23 /* MRC data blocks are aligned within the region */
24 u32 mrc_size = sizeof(*cache) + cache->data_size;
25 u8 *region_ptr = (u8 *)cache;
27 if (mrc_size & (MRC_DATA_ALIGN - 1UL)) {
28 mrc_size &= ~(MRC_DATA_ALIGN - 1UL);
29 mrc_size += MRC_DATA_ALIGN;
32 region_ptr += mrc_size;
34 return (struct mrc_data_container *)region_ptr;
37 static int is_mrc_cache(struct mrc_data_container *cache)
39 return cache && (cache->signature == MRC_DATA_SIGNATURE);
42 struct mrc_data_container *mrccache_find_current(struct mrc_region *entry)
44 struct mrc_data_container *cache, *next;
45 ulong base_addr, end_addr;
48 base_addr = entry->base + entry->offset;
49 end_addr = base_addr + entry->length;
52 /* Search for the last filled entry in the region */
53 for (id = 0, next = (struct mrc_data_container *)base_addr;
57 next = next_mrc_block(next);
58 if ((ulong)next >= end_addr)
63 debug("%s: No valid MRC cache found.\n", __func__);
68 if (cache->checksum != compute_ip_checksum(cache->data,
70 printf("%s: MRC cache checksum mismatch\n", __func__);
74 debug("%s: picked entry %u from cache block\n", __func__, id);
80 * find_next_mrc_cache() - get next cache entry
82 * @entry: MRC cache flash area
83 * @cache: Entry to start from
85 * @return next cache entry if found, NULL if we got to the end
87 static struct mrc_data_container *find_next_mrc_cache(struct mrc_region *entry,
88 struct mrc_data_container *cache)
90 ulong base_addr, end_addr;
92 base_addr = entry->base + entry->offset;
93 end_addr = base_addr + entry->length;
95 cache = next_mrc_block(cache);
96 if ((ulong)cache >= end_addr) {
97 /* Crossed the boundary */
99 debug("%s: no available entries found\n", __func__);
101 debug("%s: picked next entry from cache block at %p\n",
108 int mrccache_update(struct udevice *sf, struct mrc_region *entry,
109 struct mrc_data_container *cur)
111 struct mrc_data_container *cache;
116 if (!is_mrc_cache(cur)) {
117 debug("%s: Cache data not valid\n", __func__);
121 /* Find the last used block */
122 base_addr = entry->base + entry->offset;
123 debug("Updating MRC cache data\n");
124 cache = mrccache_find_current(entry);
125 if (cache && (cache->data_size == cur->data_size) &&
126 (!memcmp(cache, cur, cache->data_size + sizeof(*cur)))) {
127 debug("MRC data in flash is up to date. No update\n");
131 /* Move to the next block, which will be the first unused block */
133 cache = find_next_mrc_cache(entry, cache);
136 * If we have got to the end, erase the entire mrc-cache area and start
140 debug("Erasing the MRC cache region of %x bytes at %x\n",
141 entry->length, entry->offset);
143 ret = spi_flash_erase_dm(sf, entry->offset, entry->length);
145 debug("Failed to erase flash region\n");
148 cache = (struct mrc_data_container *)base_addr;
151 /* Write the data out */
152 offset = (ulong)cache - base_addr + entry->offset;
153 debug("Write MRC cache update to flash at %lx\n", offset);
154 ret = spi_flash_write_dm(sf, offset, cur->data_size + sizeof(*cur),
157 debug("Failed to write to SPI flash\n");
164 static void mrccache_setup(void *data)
166 struct mrc_data_container *cache = data;
169 cache->signature = MRC_DATA_SIGNATURE;
170 cache->data_size = gd->arch.mrc_output_len;
171 checksum = compute_ip_checksum(gd->arch.mrc_output, cache->data_size);
172 debug("Saving %d bytes for MRC output data, checksum %04x\n",
173 cache->data_size, checksum);
174 cache->checksum = checksum;
176 memcpy(cache->data, gd->arch.mrc_output, cache->data_size);
178 /* gd->arch.mrc_output now points to the container */
179 gd->arch.mrc_output = (char *)cache;
182 int mrccache_reserve(void)
184 if (!gd->arch.mrc_output_len)
187 /* adjust stack pointer to store pure cache data plus the header */
188 gd->start_addr_sp -= (gd->arch.mrc_output_len + MRC_DATA_HEADER_SIZE);
189 mrccache_setup((void *)gd->start_addr_sp);
191 gd->start_addr_sp &= ~0xf;
196 int mrccache_get_region(struct udevice **devp, struct mrc_region *entry)
198 const void *blob = gd->fdt_blob;
203 /* Find the flash chip within the SPI controller node */
204 node = fdtdec_next_compatible(blob, 0, COMPAT_GENERIC_SPI_FLASH);
206 debug("%s: Cannot find SPI flash\n", __func__);
210 if (fdtdec_get_int_array(blob, node, "memory-map", reg, 2)) {
211 debug("%s: Cannot find memory map\n", __func__);
214 entry->base = reg[0];
216 /* Find the place where we put the MRC cache */
217 mrc_node = fdt_subnode_offset(blob, node, "rw-mrc-cache");
219 debug("%s: Cannot find node\n", __func__);
223 if (fdtdec_get_int_array(blob, mrc_node, "reg", reg, 2)) {
224 debug("%s: Cannot find address\n", __func__);
227 entry->offset = reg[0];
228 entry->length = reg[1];
231 ret = uclass_get_device_by_of_offset(UCLASS_SPI_FLASH, node,
233 debug("ret = %d\n", ret);
241 int mrccache_save(void)
243 struct mrc_data_container *data;
244 struct mrc_region entry;
248 if (!gd->arch.mrc_output_len)
250 debug("Saving %d bytes of MRC output data to SPI flash\n",
251 gd->arch.mrc_output_len);
253 ret = mrccache_get_region(&sf, &entry);
256 data = (struct mrc_data_container *)gd->arch.mrc_output;
257 ret = mrccache_update(sf, &entry, data);
259 debug("Saved MRC data with checksum %04x\n", data->checksum);
260 } else if (ret == -EEXIST) {
261 debug("MRC data is the same as last time, skipping save\n");
267 debug("%s: Failed: %d\n", __func__, ret);
271 int mrccache_spl_save(void)
276 size = gd->arch.mrc_output_len + MRC_DATA_HEADER_SIZE;
279 return log_msg_ret("Allocate MRC cache block", -ENOMEM);
280 mrccache_setup(data);
281 gd->arch.mrc_output = data;
283 return mrccache_save();