MPC83xx: add config options for memory setup.
CPO value and driver strength settings are board specifc.
Also allow SPD data fetch from any accessible I2C EEPROM.
Signed-off-by: Andre Schwarz <andre.schwarz@matrix-vision.de>
Acked-by: York Sun <yorksun@freescale.com>
Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
diff --git a/arch/powerpc/cpu/mpc83xx/spd_sdram.c b/arch/powerpc/cpu/mpc83xx/spd_sdram.c
index 44aaa9a..9b01f0d 100644
--- a/arch/powerpc/cpu/mpc83xx/spd_sdram.c
+++ b/arch/powerpc/cpu/mpc83xx/spd_sdram.c
@@ -68,6 +68,12 @@
#ifndef CONFIG_SYS_READ_SPD
#define CONFIG_SYS_READ_SPD i2c_read
#endif
+#ifndef SPD_EEPROM_OFFSET
+#define SPD_EEPROM_OFFSET 0
+#endif
+#ifndef SPD_EEPROM_ADDR_LEN
+#define SPD_EEPROM_ADDR_LEN 1
+#endif
/*
* Convert picoseconds into clock cycles (rounding up if needed).
@@ -160,7 +166,8 @@
isync();
/* Read SPD parameters with I2C */
- CONFIG_SYS_READ_SPD(SPD_EEPROM_ADDRESS, 0, 1, (uchar *) & spd, sizeof (spd));
+ CONFIG_SYS_READ_SPD(SPD_EEPROM_ADDRESS, SPD_EEPROM_OFFSET,
+ SPD_EEPROM_ADDR_LEN, (uchar *) &spd, sizeof(spd));
#ifdef SPD_DEBUG
spd_debug(&spd);
#endif
@@ -562,6 +569,9 @@
* Empirically, 0x3 == 6/8 clock delay is suggested for DDR I 266.
*/
wr_data_delay = 2;
+#ifdef CONFIG_SYS_DDR_WRITE_DATA_DELAY
+ wr_data_delay = CONFIG_SYS_DDR_WRITE_DATA_DELAY;
+#endif
/*
* Write Latency
@@ -601,6 +611,9 @@
*/
cpo = 0;
if (spd.mem_type == SPD_MEMTYPE_DDR2) {
+#ifdef CONFIG_SYS_DDR_CPO
+ cpo = CONFIG_SYS_DDR_CPO;
+#else
if (effective_data_rate == 266) {
cpo = 0x4; /* READ_LAT + 1/2 */
} else if (effective_data_rate == 333) {
@@ -611,6 +624,7 @@
/* Automatic calibration */
cpo = 0x1f;
}
+#endif
}
ddr->timing_cfg_2 = (0
@@ -679,6 +693,9 @@
ddr->sdram_mode =
(0
| (1 << (16 + 10)) /* DQS Differential disable */
+#ifdef CONFIG_SYS_DDR_MODE_WEAK
+ | (1 << (16 + 1)) /* weak driver (~60%) */
+#endif
| (add_lat << (16 + 3)) /* Additive Latency in EMRS1 */
| (mode_odt_enable << 16) /* ODT Enable in EMRS1 */
| ((twr_clk - 1) << 9) /* Write Recovery Autopre */