leandrof/u-boot
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

ppc4xx: Improve DDR autodetect

Browse Source 
Added support for a second memory bank to DDR autodetection for 440
platforms.
Made hardcoded values configurable.

Signed-off-by: Dirk Eibach <eibach@gdsys.de>
Signed-off-by: Stefan Roese <sr@denx.de>
This commit is contained in:
Dirk Eibach 2008-12-09 11:00:07 +01:00 committed by Stefan Roese
parent 8f86a3636e
commit 3943d2ff6c
1 changed files with 50 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

55
cpu/ppc4xx/sdram.c
View File

@ -259,6 +259,7 @@ phys_size_t initdram(int board_type)
#ifndef CONFIG_SYS_SDRAM_TABLE
sdram_conf_t mb0cf[] = {
{(256 << 20), 13, 0x000C4001}, /* 256MB mode 3, 13x10(4) */
{(128 << 20), 13, 0x000A4001}, /* 128MB mode 3, 13x10(4) */
{(64 << 20), 12, 0x00082001} /* 64MB mode 2, 12x9(4) */
};
#else
@ -269,6 +270,18 @@ sdram_conf_t mb0cf[] = CONFIG_SYS_SDRAM_TABLE;
#define CONFIG_SYS_SDRAM0_TR0 0x41094012
#endif
#ifndef CONFIG_SYS_SDRAM0_WDDCTR
#define CONFIG_SYS_SDRAM0_WDDCTR 0x00000000 /* wrcp=0 dcd=0 */
#endif
#ifndef CONFIG_SYS_SDRAM0_RTR
#define CONFIG_SYS_SDRAM0_RTR 0x04100000 /* 7.8us @ 133MHz PLB */
#endif
#ifndef CONFIG_SYS_SDRAM0_CFG0
#define CONFIG_SYS_SDRAM0_CFG0 0x82000000 /* DCEN=1, PMUD=0, 64-bit */
#endif
#define N_MB0CF (sizeof(mb0cf) / sizeof(mb0cf[0]))
#define NUM_TRIES 64
@ -378,7 +391,7 @@ phys_size_t initdram(int board_type)
mtsdram(mem_uabba, 0x00000000); /* ubba=0 (default) */
mtsdram(mem_slio, 0x00000000); /* rdre=0 wrre=0 rarw=0 */
mtsdram(mem_devopt, 0x00000000); /* dll=0 ds=0 (normal) */
mtsdram(mem_wddctr, 0x00000000); /* wrcp=0 dcd=0 */
mtsdram(mem_wddctr, CONFIG_SYS_SDRAM0_WDDCTR);
mtsdram(mem_clktr, 0x40000000); /* clkp=1 (90 deg wr) dcdt=0 */
/*
@ -387,31 +400,63 @@ phys_size_t initdram(int board_type)
mtsdram(mem_b0cr, mb0cf[i].reg);
mtsdram(mem_tr0, CONFIG_SYS_SDRAM0_TR0);
mtsdram(mem_tr1, 0x80800800); /* SS=T2 SL=STAGE 3 CD=1 CT=0x00*/
mtsdram(mem_rtr, 0x04100000); /* Interval 7.8µs @ 133MHz PLB */
mtsdram(mem_rtr, CONFIG_SYS_SDRAM0_RTR);
mtsdram(mem_cfg1, 0x00000000); /* Self-refresh exit, disable PM*/
udelay(400); /* Delay 200 usecs (min) */
/*
* Enable the controller, then wait for DCEN to complete
*/
mtsdram(mem_cfg0, 0x82000000); /* DCEN=1, PMUD=0, 64-bit */
mtsdram(mem_cfg0, CONFIG_SYS_SDRAM0_CFG0);
udelay(10000);
if (get_ram_size(0, mb0cf[i].size) == mb0cf[i].size) {
phys_size_t size = mb0cf[i].size;
/*
* Optimize TR1 to current hardware environment
*/
sdram_tr1_set(0x00000000, &tr1_bank1);
mtsdram(mem_tr1, (tr1_bank1 | 0x80800800));
/*
* OK, size detected. Enable second bank if
* defined (assumes same type as bank 0)
*/
#ifdef CONFIG_SDRAM_BANK1
mtsdram(mem_cfg0, 0);
mtsdram(mem_b1cr, mb0cf[i].size | mb0cf[i].reg);
mtsdram(mem_cfg0, CONFIG_SYS_SDRAM0_CFG0);
udelay(10000);
/*
* Check if 2nd bank is really available.
* If the size not equal to the size of the first
* bank, then disable the 2nd bank completely.
*/
if (get_ram_size((long *)mb0cf[i].size, mb0cf[i].size)
!= mb0cf[i].size) {
mtsdram(mem_cfg0, 0);
mtsdram(mem_b1cr, 0);
mtsdram(mem_cfg0, CONFIG_SYS_SDRAM0_CFG0);
udelay(10000);
} else {
/*
* We have two identical banks, so the size
* is twice the bank size
*/
size = 2 * size;
}
#endif
#ifdef CONFIG_SDRAM_ECC
ecc_init(0, mb0cf[i].size);
ecc_init(0, size);
#endif
/*
* OK, size detected -> all done
*/
return mb0cf[i].size;
return size;
}
}