From 0649cd0d4908d9b983a0361b8665938ef25701be Mon Sep 17 00:00:00 2001 From: Simon Glass Date: Thu, 3 Aug 2017 12:21:49 -0600 Subject: Move environment files from common/ to env/ About a quarter of the files in common/ relate to the environment. It seems better to put these into their own subdirectory and remove the prefix. Signed-off-by: Simon Glass Reviewed-by: Tom Rini --- env/nvram.c | 114 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 114 insertions(+) create mode 100644 env/nvram.c (limited to 'env/nvram.c') diff --git a/env/nvram.c b/env/nvram.c new file mode 100644 index 0000000000..524f07d5f8 --- /dev/null +++ b/env/nvram.c @@ -0,0 +1,114 @@ +/* + * (C) Copyright 2000-2010 + * Wolfgang Denk, DENX Software Engineering, wd@denx.de. + * + * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH + * Andreas Heppel + + * SPDX-License-Identifier: GPL-2.0+ + */ + +/* + * 09-18-2001 Andreas Heppel, Sysgo RTS GmbH + * + * It might not be possible in all cases to use 'memcpy()' to copy + * the environment to NVRAM, as the NVRAM might not be mapped into + * the memory space. (I.e. this is the case for the BAB750). In those + * cases it might be possible to access the NVRAM using a different + * method. For example, the RTC on the BAB750 is accessible in IO + * space using its address and data registers. To enable usage of + * NVRAM in those cases I invented the functions 'nvram_read()' and + * 'nvram_write()', which will be activated upon the configuration + * #define CONFIG_SYS_NVRAM_ACCESS_ROUTINE. Note, that those functions are + * strongly dependent on the used HW, and must be redefined for each + * board that wants to use them. + */ + +#include +#include +#include +#include +#include +#include + +DECLARE_GLOBAL_DATA_PTR; + +#ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE +extern void *nvram_read(void *dest, const long src, size_t count); +extern void nvram_write(long dest, const void *src, size_t count); +env_t *env_ptr; +#else +env_t *env_ptr = (env_t *)CONFIG_ENV_ADDR; +#endif + +char *env_name_spec = "NVRAM"; + +#ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE +uchar env_get_char_spec(int index) +{ + uchar c; + + nvram_read(&c, CONFIG_ENV_ADDR + index, 1); + + return c; +} +#endif + +void env_relocate_spec(void) +{ + char buf[CONFIG_ENV_SIZE]; + +#if defined(CONFIG_SYS_NVRAM_ACCESS_ROUTINE) + nvram_read(buf, CONFIG_ENV_ADDR, CONFIG_ENV_SIZE); +#else + memcpy(buf, (void *)CONFIG_ENV_ADDR, CONFIG_ENV_SIZE); +#endif + env_import(buf, 1); +} + +int saveenv(void) +{ + env_t env_new; + int rcode = 0; + + rcode = env_export(&env_new); + if (rcode) + return rcode; + +#ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE + nvram_write(CONFIG_ENV_ADDR, &env_new, CONFIG_ENV_SIZE); +#else + if (memcpy((char *)CONFIG_ENV_ADDR, &env_new, CONFIG_ENV_SIZE) == NULL) + rcode = 1; +#endif + return rcode; +} + +/* + * Initialize Environment use + * + * We are still running from ROM, so data use is limited + */ +int env_init(void) +{ +#if defined(CONFIG_SYS_NVRAM_ACCESS_ROUTINE) + ulong crc; + uchar data[ENV_SIZE]; + + nvram_read(&crc, CONFIG_ENV_ADDR, sizeof(ulong)); + nvram_read(data, CONFIG_ENV_ADDR + sizeof(ulong), ENV_SIZE); + + if (crc32(0, data, ENV_SIZE) == crc) { + gd->env_addr = (ulong)CONFIG_ENV_ADDR + sizeof(long); +#else + if (crc32(0, env_ptr->data, ENV_SIZE) == env_ptr->crc) { + gd->env_addr = (ulong)&env_ptr->data; +#endif + gd->env_valid = 1; + } else { + gd->env_addr = (ulong)&default_environment[0]; + gd->env_valid = 0; + } + + return 0; +} -- cgit v1.2.3