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-rw-r--r--common/env_sf.c131
1 files changed, 131 insertions, 0 deletions
diff --git a/common/env_sf.c b/common/env_sf.c
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--- /dev/null
+++ b/common/env_sf.c
@@ -0,0 +1,131 @@
+/*
+ * (C) Copyright 2000-2002
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Andreas Heppel <aheppel@sysgo.de>
+ *
+ * (C) Copyright 2008 Atmel Corporation
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+#include <common.h>
+
+#ifdef CFG_ENV_IS_IN_SPI_FLASH
+
+#include <environment.h>
+#include <spi_flash.h>
+
+#ifndef CFG_ENV_SPI_BUS
+# define CFG_ENV_SPI_BUS 0
+#endif
+#ifndef CFG_ENV_SPI_CS
+# define CFG_ENV_SPI_CS 0
+#endif
+#ifndef CFG_ENV_SPI_MAX_HZ
+# define CFG_ENV_SPI_MAX_HZ 1000000
+#endif
+#ifndef CFG_ENV_SPI_MODE
+# define CFG_ENV_SPI_MODE SPI_MODE_3
+#endif
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/* references to names in env_common.c */
+extern uchar default_environment[];
+extern int default_environment_size;
+
+char * env_name_spec = "SPI Flash";
+env_t *env_ptr;
+
+static struct spi_flash *env_flash;
+
+uchar env_get_char_spec(int index)
+{
+ return *((uchar *)(gd->env_addr + index));
+}
+
+int saveenv(void)
+{
+ if (!env_flash) {
+ puts("Environment SPI flash not initialized\n");
+ return 1;
+ }
+
+ puts("Erasing SPI flash...");
+ if (spi_flash_erase(env_flash, CFG_ENV_OFFSET, CFG_ENV_SIZE))
+ return 1;
+
+ puts("Writing to SPI flash...");
+ if (spi_flash_write(env_flash, CFG_ENV_OFFSET, CFG_ENV_SIZE, env_ptr))
+ return 1;
+
+ puts("done\n");
+ return 0;
+}
+
+void env_relocate_spec(void)
+{
+ int ret;
+
+ env_flash = spi_flash_probe(CFG_ENV_SPI_BUS, CFG_ENV_SPI_CS,
+ CFG_ENV_SPI_MAX_HZ, CFG_ENV_SPI_MODE);
+ if (!env_flash)
+ goto err_probe;
+
+ ret = spi_flash_read(env_flash, CFG_ENV_OFFSET, CFG_ENV_SIZE, env_ptr);
+ if (ret)
+ goto err_read;
+
+ if (crc32(0, env_ptr->data, ENV_SIZE) != env_ptr->crc)
+ goto err_crc;
+
+ gd->env_valid = 1;
+
+ return;
+
+err_read:
+ spi_flash_free(env_flash);
+ env_flash = NULL;
+err_probe:
+err_crc:
+ puts("*** Warning - bad CRC, using default environment\n\n");
+
+ if (default_environment_size > CFG_ENV_SIZE) {
+ gd->env_valid = 0;
+ puts("*** Error - default environment is too large\n\n");
+ return;
+ }
+
+ memset(env_ptr, 0, sizeof(env_t));
+ memcpy(env_ptr->data, default_environment, default_environment_size);
+ env_ptr->crc = crc32(0, env_ptr->data, ENV_SIZE);
+ gd->env_valid = 1;
+}
+
+int env_init(void)
+{
+ /* SPI flash isn't usable before relocation */
+ gd->env_addr = (ulong)&default_environment[0];
+ gd->env_valid = 1;
+
+ return 0;
+}
+
+#endif /* CFG_ENV_IS_IN_SPI_FLASH */