ARM: AM43XX: board: add support for reading onboard EEPROM

[platform/kernel/u-boot.git] / board / ti / am43xx / board.c

diff --git a/board/ti/am43xx/board.c b/board/ti/am43xx/board.c
index dcd8cbb..4fc1a40 100644 (file)
--- a/board/ti/am43xx/board.c
+++ b/board/ti/am43xx/board.c
@@ -9,6 +9,8 @@
  */
 
 #include <common.h>
+#include <i2c.h>
+#include <asm/errno.h>
 #include <spl.h>
 #include <asm/arch/clock.h>
 #include <asm/arch/sys_proto.h>
@@ -17,6 +19,50 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
+/*
+ * Read header information from EEPROM into global structure.
+ */
+static int read_eeprom(struct am43xx_board_id *header)
+{
+       /* Check if baseboard eeprom is available */
+       if (i2c_probe(CONFIG_SYS_I2C_EEPROM_ADDR)) {
+               printf("Could not probe the EEPROM at 0x%x\n",
+                      CONFIG_SYS_I2C_EEPROM_ADDR);
+               return -ENODEV;
+       }
+
+       /* read the eeprom using i2c */
+       if (i2c_read(CONFIG_SYS_I2C_EEPROM_ADDR, 0, 2, (uchar *)header,
+                    sizeof(struct am43xx_board_id))) {
+               printf("Could not read the EEPROM\n");
+               return -EIO;
+       }
+
+       if (header->magic != 0xEE3355AA) {
+               /*
+                * read the eeprom using i2c again,
+                * but use only a 1 byte address
+                */
+               if (i2c_read(CONFIG_SYS_I2C_EEPROM_ADDR, 0, 1, (uchar *)header,
+                            sizeof(struct am43xx_board_id))) {
+                       printf("Could not read the EEPROM at 0x%x\n",
+                              CONFIG_SYS_I2C_EEPROM_ADDR);
+                       return -EIO;
+               }
+
+               if (header->magic != 0xEE3355AA) {
+                       printf("Incorrect magic number (0x%x) in EEPROM\n",
+                              header->magic);
+                       return -EINVAL;
+               }
+       }
+
+       strncpy(am43xx_board_name, (char *)header->name, sizeof(header->name));
+       am43xx_board_name[sizeof(header->name)] = 0;
+
+       return 0;
+}
+
 #ifdef CONFIG_SPL_BUILD
 
 const struct dpll_params dpll_ddr = {