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Diffstat (limited to 'cpu/mpc85xx/spd_sdram.c')
-rw-r--r--cpu/mpc85xx/spd_sdram.c67
1 files changed, 58 insertions, 9 deletions
diff --git a/cpu/mpc85xx/spd_sdram.c b/cpu/mpc85xx/spd_sdram.c
index 3777f49..5dc223a 100644
--- a/cpu/mpc85xx/spd_sdram.c
+++ b/cpu/mpc85xx/spd_sdram.c
@@ -1,5 +1,5 @@
/*
- * Copyright 2004 Freescale Semiconductor.
+ * Copyright 2004, 2007 Freescale Semiconductor.
* (C) Copyright 2003 Motorola Inc.
* Xianghua Xiao (X.Xiao@motorola.com)
*
@@ -173,11 +173,10 @@ spd_sdram(void)
{
volatile immap_t *immap = (immap_t *)CFG_IMMR;
volatile ccsr_ddr_t *ddr = &immap->im_ddr;
- volatile ccsr_gur_t *gur = &immap->im_gur;
spd_eeprom_t spd;
unsigned int n_ranks;
unsigned int rank_density;
- unsigned int odt_rd_cfg, odt_wr_cfg;
+ unsigned int odt_rd_cfg, odt_wr_cfg, ba_bits;
unsigned int odt_cfg, mode_odt_enable;
unsigned int refresh_clk;
#ifdef MPC85xx_DDR_SDRAM_CLK_CNTL
@@ -189,7 +188,7 @@ spd_sdram(void)
unsigned int max_data_rate, effective_data_rate;
unsigned int busfreq;
unsigned sdram_cfg;
- unsigned int memsize;
+ unsigned int memsize = 0;
unsigned char caslat, caslat_ctrl;
unsigned int trfc, trfc_clk, trfc_low, trfc_high;
unsigned int trcd_clk;
@@ -204,6 +203,46 @@ spd_sdram(void)
unsigned int mode_caslat;
unsigned char sdram_type;
unsigned char d_init;
+ unsigned int bnds;
+
+ /*
+ * Skip configuration if already configured.
+ * memsize is determined from last configured chip select.
+ */
+ if (ddr->cs0_config & 0x80000000) {
+ debug(" cs0 already configured, bnds=%x\n",ddr->cs0_bnds);
+ bnds = 0xfff & ddr->cs0_bnds;
+ if (bnds < 0xff) { /* do not add if at top of 4G */
+ memsize = (bnds + 1) << 4;
+ }
+ }
+ if (ddr->cs1_config & 0x80000000) {
+ debug(" cs1 already configured, bnds=%x\n",ddr->cs1_bnds);
+ bnds = 0xfff & ddr->cs1_bnds;
+ if (bnds < 0xff) { /* do not add if at top of 4G */
+ memsize = (bnds + 1) << 4; /* assume ordered bnds */
+ }
+ }
+ if (ddr->cs2_config & 0x80000000) {
+ debug(" cs2 already configured, bnds=%x\n",ddr->cs2_bnds);
+ bnds = 0xfff & ddr->cs2_bnds;
+ if (bnds < 0xff) { /* do not add if at top of 4G */
+ memsize = (bnds + 1) << 4;
+ }
+ }
+ if (ddr->cs3_config & 0x80000000) {
+ debug(" cs3 already configured, bnds=%x\n",ddr->cs3_bnds);
+ bnds = 0xfff & ddr->cs3_bnds;
+ if (bnds < 0xff) { /* do not add if at top of 4G */
+ memsize = (bnds + 1) << 4;
+ }
+ }
+
+ if (memsize) {
+ printf(" Reusing current %dMB configuration\n",memsize);
+ memsize = setup_laws_and_tlbs(memsize);
+ return memsize << 20;
+ }
/*
* Read SPD information.
@@ -262,6 +301,7 @@ spd_sdram(void)
return 0;
}
+#ifdef CONFIG_MPC8548
/*
* Adjust DDR II IO voltage biasing.
* Only 8548 rev 1 needs the fix
@@ -269,9 +309,11 @@ spd_sdram(void)
if ((SVR_VER(get_svr()) == SVR_8548_E) &&
(SVR_MJREV(get_svr()) == 1) &&
(spd.mem_type == SPD_MEMTYPE_DDR2)) {
+ volatile ccsr_gur_t *gur = &immap->im_gur;
gur->ddrioovcr = (0x80000000 /* Enable */
| 0x10000000);/* VSEL to 1.8V */
}
+#endif
/*
* Determine the size of each Rank in bytes.
@@ -299,9 +341,14 @@ spd_sdram(void)
#endif
}
+ ba_bits = 0;
+ if (spd.nbanks == 0x8)
+ ba_bits = 1;
+
ddr->cs0_config = ( 1 << 31
| (odt_rd_cfg << 20)
| (odt_wr_cfg << 16)
+ | (ba_bits << 14)
| (spd.nrow_addr - 12) << 8
| (spd.ncol_addr - 8) );
debug("\n");
@@ -645,13 +692,10 @@ spd_sdram(void)
*/
cpo = 0;
if (spd.mem_type == SPD_MEMTYPE_DDR2) {
- if (effective_data_rate == 266 || effective_data_rate == 333) {
+ if (effective_data_rate <= 333) {
cpo = 0x7; /* READ_LAT + 5/4 */
- } else if (effective_data_rate == 400) {
- cpo = 0x9; /* READ_LAT + 7/4 */
} else {
- /* Pure speculation */
- cpo = 0xb;
+ cpo = 0x9; /* READ_LAT + 7/4 */
}
}
@@ -858,7 +902,12 @@ spd_sdram(void)
if (spd.mem_type == SPD_MEMTYPE_DDR)
clk_adjust = 0x6;
else
+#ifdef CONFIG_MPC8568
+ /* Empirally setting clk_adjust */
+ clk_adjust = 0x6;
+#else
clk_adjust = 0x7;
+#endif
ddr->sdram_clk_cntl = (0
| 0x80000000