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)
68 puts("No MMC card found\n");
73 puts("MMC init failed\n");
77 #ifdef CONFIG_SYS_MMC_ENV_PART
78 if (CONFIG_SYS_MMC_ENV_PART != mmc->part_num) {
79 if (mmc_switch_part(CONFIG_SYS_MMC_ENV_DEV,
80 CONFIG_SYS_MMC_ENV_PART)) {
81 puts("MMC partition switch failed\n");
90 static void fini_mmc_for_env(struct mmc *mmc)
92 #ifdef CONFIG_SYS_MMC_ENV_PART
93 if (CONFIG_SYS_MMC_ENV_PART != mmc->part_num)
94 mmc_switch_part(CONFIG_SYS_MMC_ENV_DEV,
99 #ifdef CONFIG_CMD_SAVEENV
100 static inline int write_env(struct mmc *mmc, unsigned long size,
101 unsigned long offset, const void *buffer)
103 uint blk_start, blk_cnt, n;
105 blk_start = ALIGN(offset, mmc->write_bl_len) / mmc->write_bl_len;
106 blk_cnt = ALIGN(size, mmc->write_bl_len) / mmc->write_bl_len;
108 n = mmc->block_dev.block_write(CONFIG_SYS_MMC_ENV_DEV, blk_start,
109 blk_cnt, (u_char *)buffer);
111 return (n == blk_cnt) ? 0 : -1;
114 #ifdef CONFIG_ENV_OFFSET_REDUND
115 static unsigned char env_flags;
120 ALLOC_CACHE_ALIGN_BUFFER(env_t, env_new, 1);
121 struct mmc *mmc = find_mmc_device(CONFIG_SYS_MMC_ENV_DEV);
125 if (init_mmc_for_env(mmc))
128 ret = env_export(env_new);
132 #ifdef CONFIG_ENV_OFFSET_REDUND
133 env_new->flags = ++env_flags; /* increase the serial */
135 if (gd->env_valid == 1)
139 if (mmc_get_env_addr(mmc, copy, &offset)) {
144 printf("Writing to %sMMC(%d)... ", copy ? "redundant " : "",
145 CONFIG_SYS_MMC_ENV_DEV);
146 if (write_env(mmc, CONFIG_ENV_SIZE, offset, (u_char *)env_new)) {
155 #ifdef CONFIG_ENV_OFFSET_REDUND
156 gd->env_valid = gd->env_valid == 2 ? 1 : 2;
160 fini_mmc_for_env(mmc);
163 #endif /* CONFIG_CMD_SAVEENV */
165 static inline int read_env(struct mmc *mmc, unsigned long size,
166 unsigned long offset, const void *buffer)
168 uint blk_start, blk_cnt, n;
170 blk_start = ALIGN(offset, mmc->read_bl_len) / mmc->read_bl_len;
171 blk_cnt = ALIGN(size, mmc->read_bl_len) / mmc->read_bl_len;
173 n = mmc->block_dev.block_read(CONFIG_SYS_MMC_ENV_DEV, blk_start,
174 blk_cnt, (uchar *)buffer);
176 return (n == blk_cnt) ? 0 : -1;
179 #ifdef CONFIG_ENV_OFFSET_REDUND
180 void env_relocate_spec(void)
182 #if !defined(ENV_IS_EMBEDDED)
183 struct mmc *mmc = find_mmc_device(CONFIG_SYS_MMC_ENV_DEV);
184 u32 offset1, offset2;
185 int read1_fail = 0, read2_fail = 0;
186 int crc1_ok = 0, crc2_ok = 0;
190 ALLOC_CACHE_ALIGN_BUFFER(env_t, tmp_env1, 1);
191 ALLOC_CACHE_ALIGN_BUFFER(env_t, tmp_env2, 1);
193 if (tmp_env1 == NULL || tmp_env2 == NULL) {
194 puts("Can't allocate buffers for environment\n");
199 if (init_mmc_for_env(mmc)) {
204 if (mmc_get_env_addr(mmc, 0, &offset1) ||
205 mmc_get_env_addr(mmc, 1, &offset2)) {
210 read1_fail = read_env(mmc, CONFIG_ENV_SIZE, offset1, tmp_env1);
211 read2_fail = read_env(mmc, CONFIG_ENV_SIZE, offset2, tmp_env2);
213 if (read1_fail && read2_fail)
214 puts("*** Error - No Valid Environment Area found\n");
215 else if (read1_fail || read2_fail)
216 puts("*** Warning - some problems detected "
217 "reading environment; recovered successfully\n");
219 crc1_ok = !read1_fail &&
220 (crc32(0, tmp_env1->data, ENV_SIZE) == tmp_env1->crc);
221 crc2_ok = !read2_fail &&
222 (crc32(0, tmp_env2->data, ENV_SIZE) == tmp_env2->crc);
224 if (!crc1_ok && !crc2_ok) {
227 } else if (crc1_ok && !crc2_ok) {
229 } else if (!crc1_ok && crc2_ok) {
232 /* both ok - check serial */
233 if (tmp_env1->flags == 255 && tmp_env2->flags == 0)
235 else if (tmp_env2->flags == 255 && tmp_env1->flags == 0)
237 else if (tmp_env1->flags > tmp_env2->flags)
239 else if (tmp_env2->flags > tmp_env1->flags)
241 else /* flags are equal - almost impossible */
247 if (gd->env_valid == 1)
252 env_flags = ep->flags;
253 env_import((char *)ep, 0);
257 fini_mmc_for_env(mmc);
260 set_default_env(NULL);
264 #else /* ! CONFIG_ENV_OFFSET_REDUND */
265 void env_relocate_spec(void)
267 #if !defined(ENV_IS_EMBEDDED)
268 ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
269 struct mmc *mmc = find_mmc_device(CONFIG_SYS_MMC_ENV_DEV);
273 if (init_mmc_for_env(mmc)) {
278 if (mmc_get_env_addr(mmc, 0, &offset)) {
283 if (read_env(mmc, CONFIG_ENV_SIZE, offset, buf)) {
292 fini_mmc_for_env(mmc);
295 set_default_env(NULL);
298 #endif /* CONFIG_ENV_OFFSET_REDUND */