2 * (C) Copyright 2008-2011 Freescale Semiconductor, Inc.
4 * SPDX-License-Identifier: GPL-2.0+
12 #include <environment.h>
13 #include <linux/stddef.h>
19 #if defined(CONFIG_ENV_SIZE_REDUND) && \
20 (CONFIG_ENV_SIZE_REDUND != CONFIG_ENV_SIZE)
21 #error CONFIG_ENV_SIZE_REDUND should be the same as CONFIG_ENV_SIZE
24 char *env_name_spec = "MMC";
26 #ifdef ENV_IS_EMBEDDED
27 env_t *env_ptr = &environment;
28 #else /* ! ENV_IS_EMBEDDED */
30 #endif /* ENV_IS_EMBEDDED */
32 DECLARE_GLOBAL_DATA_PTR;
34 #if !defined(CONFIG_ENV_OFFSET)
35 #define CONFIG_ENV_OFFSET 0
38 __weak int mmc_get_env_addr(struct mmc *mmc, int copy, u32 *env_addr)
42 offset = CONFIG_ENV_OFFSET;
43 #ifdef CONFIG_ENV_OFFSET_REDUND
45 offset = CONFIG_ENV_OFFSET_REDUND;
49 offset += mmc->capacity;
59 gd->env_addr = (ulong)&default_environment[0];
65 static int init_mmc_for_env(struct mmc *mmc)
67 #ifdef CONFIG_SYS_MMC_ENV_PART
68 int dev = CONFIG_SYS_MMC_ENV_DEV;
70 #ifdef CONFIG_SPL_BUILD
76 puts("No MMC card found\n");
81 puts("MMC init failed\n");
85 #ifdef CONFIG_SYS_MMC_ENV_PART
86 if (CONFIG_SYS_MMC_ENV_PART != mmc->part_num) {
87 if (mmc_switch_part(dev, CONFIG_SYS_MMC_ENV_PART)) {
88 puts("MMC partition switch failed\n");
97 static void fini_mmc_for_env(struct mmc *mmc)
99 #ifdef CONFIG_SYS_MMC_ENV_PART
100 int dev = CONFIG_SYS_MMC_ENV_DEV;
102 #ifdef CONFIG_SPL_BUILD
105 if (CONFIG_SYS_MMC_ENV_PART != mmc->part_num)
106 mmc_switch_part(dev, mmc->part_num);
110 #ifdef CONFIG_CMD_SAVEENV
111 static inline int write_env(struct mmc *mmc, unsigned long size,
112 unsigned long offset, const void *buffer)
114 uint blk_start, blk_cnt, n;
116 blk_start = ALIGN(offset, mmc->write_bl_len) / mmc->write_bl_len;
117 blk_cnt = ALIGN(size, mmc->write_bl_len) / mmc->write_bl_len;
119 n = mmc->block_dev.block_write(CONFIG_SYS_MMC_ENV_DEV, blk_start,
120 blk_cnt, (u_char *)buffer);
122 return (n == blk_cnt) ? 0 : -1;
125 #ifdef CONFIG_ENV_OFFSET_REDUND
126 static unsigned char env_flags;
131 ALLOC_CACHE_ALIGN_BUFFER(env_t, env_new, 1);
132 struct mmc *mmc = find_mmc_device(CONFIG_SYS_MMC_ENV_DEV);
136 if (init_mmc_for_env(mmc))
139 ret = env_export(env_new);
143 #ifdef CONFIG_ENV_OFFSET_REDUND
144 env_new->flags = ++env_flags; /* increase the serial */
146 if (gd->env_valid == 1)
150 if (mmc_get_env_addr(mmc, copy, &offset)) {
155 printf("Writing to %sMMC(%d)... ", copy ? "redundant " : "",
156 CONFIG_SYS_MMC_ENV_DEV);
157 if (write_env(mmc, CONFIG_ENV_SIZE, offset, (u_char *)env_new)) {
166 #ifdef CONFIG_ENV_OFFSET_REDUND
167 gd->env_valid = gd->env_valid == 2 ? 1 : 2;
171 fini_mmc_for_env(mmc);
174 #endif /* CONFIG_CMD_SAVEENV */
176 static inline int read_env(struct mmc *mmc, unsigned long size,
177 unsigned long offset, const void *buffer)
179 uint blk_start, blk_cnt, n;
180 int dev = CONFIG_SYS_MMC_ENV_DEV;
182 #ifdef CONFIG_SPL_BUILD
186 blk_start = ALIGN(offset, mmc->read_bl_len) / mmc->read_bl_len;
187 blk_cnt = ALIGN(size, mmc->read_bl_len) / mmc->read_bl_len;
189 n = mmc->block_dev.block_read(dev, blk_start, blk_cnt, (uchar *)buffer);
191 return (n == blk_cnt) ? 0 : -1;
194 #ifdef CONFIG_ENV_OFFSET_REDUND
195 void env_relocate_spec(void)
197 #if !defined(ENV_IS_EMBEDDED)
199 u32 offset1, offset2;
200 int read1_fail = 0, read2_fail = 0;
201 int crc1_ok = 0, crc2_ok = 0;
204 int dev = CONFIG_SYS_MMC_ENV_DEV;
206 ALLOC_CACHE_ALIGN_BUFFER(env_t, tmp_env1, 1);
207 ALLOC_CACHE_ALIGN_BUFFER(env_t, tmp_env2, 1);
209 #ifdef CONFIG_SPL_BUILD
213 mmc = find_mmc_device(dev);
215 if (init_mmc_for_env(mmc)) {
220 if (mmc_get_env_addr(mmc, 0, &offset1) ||
221 mmc_get_env_addr(mmc, 1, &offset2)) {
226 read1_fail = read_env(mmc, CONFIG_ENV_SIZE, offset1, tmp_env1);
227 read2_fail = read_env(mmc, CONFIG_ENV_SIZE, offset2, tmp_env2);
229 if (read1_fail && read2_fail)
230 puts("*** Error - No Valid Environment Area found\n");
231 else if (read1_fail || read2_fail)
232 puts("*** Warning - some problems detected "
233 "reading environment; recovered successfully\n");
235 crc1_ok = !read1_fail &&
236 (crc32(0, tmp_env1->data, ENV_SIZE) == tmp_env1->crc);
237 crc2_ok = !read2_fail &&
238 (crc32(0, tmp_env2->data, ENV_SIZE) == tmp_env2->crc);
240 if (!crc1_ok && !crc2_ok) {
243 } else if (crc1_ok && !crc2_ok) {
245 } else if (!crc1_ok && crc2_ok) {
248 /* both ok - check serial */
249 if (tmp_env1->flags == 255 && tmp_env2->flags == 0)
251 else if (tmp_env2->flags == 255 && tmp_env1->flags == 0)
253 else if (tmp_env1->flags > tmp_env2->flags)
255 else if (tmp_env2->flags > tmp_env1->flags)
257 else /* flags are equal - almost impossible */
263 if (gd->env_valid == 1)
268 env_flags = ep->flags;
269 env_import((char *)ep, 0);
273 fini_mmc_for_env(mmc);
276 set_default_env(NULL);
280 #else /* ! CONFIG_ENV_OFFSET_REDUND */
281 void env_relocate_spec(void)
283 #if !defined(ENV_IS_EMBEDDED)
284 ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
288 int dev = CONFIG_SYS_MMC_ENV_DEV;
290 #ifdef CONFIG_SPL_BUILD
294 mmc = find_mmc_device(dev);
296 if (init_mmc_for_env(mmc)) {
301 if (mmc_get_env_addr(mmc, 0, &offset)) {
306 if (read_env(mmc, CONFIG_ENV_SIZE, offset, buf)) {
315 fini_mmc_for_env(mmc);
318 set_default_env(NULL);
321 #endif /* CONFIG_ENV_OFFSET_REDUND */