am335x, dxr2: get ECC sType from I2C eeprom

read the ECC Type field from the i2c eeprom, instead
configuring it static in the U-Boot binary.

see RM:
Table 26-17. NAND Geometry Information on I2C EEPROM

Signed-off-by: Heiko Schocher <hs@denx.de>

diff --git a/board/siemens/draco/board.c b/board/siemens/draco/board.c
index 988c12a..41bdef0 100644 (file)
--- a/board/siemens/draco/board.c
+++ b/board/siemens/draco/board.c
@@ -105,6 +105,40 @@ static void print_chip_data(void)
 }
 #endif /* CONFIG_SPL_BUILD */
 
+#define AM335X_NAND_ECC_MASK 0x0f
+#define AM335X_NAND_ECC_TYPE_16 0x02
+
+static int ecc_type;
+
+struct am335x_nand_geometry {
+       u32 magic;
+       u8 nand_geo_addr;
+       u8 nand_geo_page;
+       u8 nand_bus;
+};
+
+static int draco_read_nand_geometry(void)
+{
+       struct am335x_nand_geometry geo;
+
+       /* Read NAND geometry */
+       if (i2c_read(CONFIG_SYS_I2C_EEPROM_ADDR, 0x80, 2,
+                    (uchar *)&geo, sizeof(struct am335x_nand_geometry))) {
+               printf("Could not read the NAND geomtery; something fundamentally wrong on the I2C bus.\n");
+               return -EIO;
+       }
+       if (geo.magic != 0xa657b310) {
+               printf("%s: bad magic: %x\n", __func__, geo.magic);
+               return -EFAULT;
+       }
+       if ((geo.nand_bus & AM335X_NAND_ECC_MASK) == AM335X_NAND_ECC_TYPE_16)
+               ecc_type = 16;
+       else
+               ecc_type = 8;
+
+       return 0;
+}
+
 /*
  * Read header information from EEPROM into global structure.
  */
@@ -147,6 +181,8 @@ static int read_eeprom(void)
                printf("Warning: No chip data in eeprom\n");
 
        print_ddr3_timings();
+
+       return draco_read_nand_geometry();
 #endif
        return 0;
 }
@@ -207,7 +243,14 @@ static void spl_siemens_board_init(void)
 #ifdef CONFIG_BOARD_LATE_INIT
 int board_late_init(void)
 {
-       omap_nand_switch_ecc(1, 8);
+       int ret;
+
+       ret = draco_read_nand_geometry();
+       if (ret != 0)
+               return ret;
+
+       nand_curr_device = 0;
+       omap_nand_switch_ecc(1, ecc_type);
 #ifdef CONFIG_FACTORYSET
        /* Set ASN in environment*/
        if (factory_dat.asn[0] != 0) {