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85xx allow debugger to configure ddr. 

Only check for mpc8548 rev 1 when compiled for 8548.

Signed-off-by: Ed Swarthout <Ed.Swarthout@freescale.com>
Acked-by: Andy Fleming <afleming@freescale.com>
This commit is contained in:
Ed Swarthout 2007-07-27 01:50:48 -05:00 committed by Andrew Fleming-AFLEMING
parent 29372ff38c
commit 40c7f9b0de
1 changed files with 45 additions and 3 deletions
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48
cpu/mpc85xx/spd_sdram.c
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@ -1,5 +1,5 @@
/*
* Copyright 2004 Freescale Semiconductor.
* Copyright 2004, 2007 Freescale Semiconductor.
* (C) Copyright 2003 Motorola Inc.
* Xianghua Xiao (X.Xiao@motorola.com)
*
@ -173,7 +173,6 @@ 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;
@ -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.