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authorKumar Gala <galak@kernel.crashing.org>2008-08-12 11:13:08 -0500
committerKumar Gala <galak@kernel.crashing.org>2008-08-27 11:43:53 -0500
commit129ba616b3813dde861f25f3d8a3c47c5c36ad5f (patch)
tree16a8096c17bd3b04a09070a4176fc51ae53aed4d /board/freescale/mpc8572ds/ddr.c
parent457caecdbca3df21a93abff19eab12dbc61b7897 (diff)
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mpc85xx: Add support for the MPC8572DS reference board
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Diffstat (limited to 'board/freescale/mpc8572ds/ddr.c')
-rw-r--r--board/freescale/mpc8572ds/ddr.c81
1 files changed, 81 insertions, 0 deletions
diff --git a/board/freescale/mpc8572ds/ddr.c b/board/freescale/mpc8572ds/ddr.c
new file mode 100644
index 0000000..5f8c555
--- /dev/null
+++ b/board/freescale/mpc8572ds/ddr.c
@@ -0,0 +1,81 @@
+/*
+ * Copyright 2008 Freescale Semiconductor, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * Version 2 as published by the Free Software Foundation.
+ */
+
+#include <common.h>
+#include <i2c.h>
+
+#include <asm/fsl_ddr_sdram.h>
+
+static void get_spd(ddr2_spd_eeprom_t *spd, unsigned char i2c_address)
+{
+ i2c_read(i2c_address, 0, 1, (uchar *)spd, sizeof(ddr2_spd_eeprom_t));
+}
+
+unsigned int fsl_ddr_get_mem_data_rate(void)
+{
+ return get_ddr_freq(0);
+}
+
+void fsl_ddr_get_spd(ddr2_spd_eeprom_t *ctrl_dimms_spd,
+ unsigned int ctrl_num)
+{
+ unsigned int i;
+ unsigned int i2c_address = 0;
+
+ for (i = 0; i < CONFIG_DIMM_SLOTS_PER_CTLR; i++) {
+ if (ctrl_num == 0 && i == 0) {
+ i2c_address = SPD_EEPROM_ADDRESS1;
+ }
+ if (ctrl_num == 1 && i == 0) {
+ i2c_address = SPD_EEPROM_ADDRESS2;
+ }
+ get_spd(&(ctrl_dimms_spd[i]), i2c_address);
+ }
+}
+
+void fsl_ddr_board_options(memctl_options_t *popts, unsigned int ctrl_num)
+{
+ /*
+ * Factors to consider for clock adjust:
+ * - number of chips on bus
+ * - position of slot
+ * - DDR1 vs. DDR2?
+ * - ???
+ *
+ * This needs to be determined on a board-by-board basis.
+ * 0110 3/4 cycle late
+ * 0111 7/8 cycle late
+ */
+ popts->clk_adjust = 7;
+
+ /*
+ * Factors to consider for CPO:
+ * - frequency
+ * - ddr1 vs. ddr2
+ */
+ popts->cpo_override = 10;
+
+ /*
+ * Factors to consider for write data delay:
+ * - number of DIMMs
+ *
+ * 1 = 1/4 clock delay
+ * 2 = 1/2 clock delay
+ * 3 = 3/4 clock delay
+ * 4 = 1 clock delay
+ * 5 = 5/4 clock delay
+ * 6 = 3/2 clock delay
+ */
+ popts->write_data_delay = 5;
+
+ /*
+ * Factors to consider for half-strength driver enable:
+ * - number of DIMMs installed
+ */
+ popts->half_strength_driver_enable = 0;
+}