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 --- cpu/ppc4xx/sdram.c | 55 +++++++++++++++++++++++++++++++++++++++++++++++---- 1 files changed, 50 insertions(+), 5 deletions(-)
diff --git a/cpu/ppc4xx/sdram.c b/cpu/ppc4xx/sdram.c index 6d5f8d6..c785414 100644 --- a/cpu/ppc4xx/sdram.c +++ b/cpu/ppc4xx/sdram.c @@ -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 /* 7.8µs @ 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; } }