blob: ccd06e96a5a70408daac5c584677ba94bc962761 [file] [log] [blame]
/*
* (C) Copyright 2003 Motorola Inc.
* Xianghua Xiao (X.Xiao@motorola.com)
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <common.h>
#include <asm/processor.h>
#include <i2c.h>
#include <spd.h>
#include <asm/mmu.h>
#ifdef CONFIG_SPD_EEPROM
#undef DEBUG
#if defined(DEBUG)
#define DEB(x) x
#else
#define DEB(x)
#endif
#define ns2clk(ns) ((ns) / (2000000000 /get_bus_freq(0) + 1))
long int spd_sdram(void) {
volatile immap_t *immap = (immap_t *)CFG_IMMR;
volatile ccsr_ddr_t *ddr = &immap->im_ddr;
volatile ccsr_local_ecm_t *ecm = &immap->im_local_ecm;
spd_eeprom_t spd;
unsigned int memsize,tmp,tmp1,tmp2;
unsigned char caslat;
i2c_read (SPD_EEPROM_ADDRESS, 0, 1, (uchar *) & spd, sizeof (spd));
if ( spd.nrows > 2 ) {
printf("DDR:Only two chip selects are supported on ADS.\n");
return 0;
}
if ( spd.nrow_addr < 12 || spd.nrow_addr > 14 || spd.ncol_addr < 8 || spd.ncol_addr > 11) {
printf("DDR:Row or Col number unsupported.\n");
return 0;
}
ddr->cs0_bnds = ((spd.row_dens>>2) - 1);
ddr->cs0_config = ( 1<<31 | (spd.nrow_addr-12)<<8 | (spd.ncol_addr-8) );
DEB(printf("\n"));
DEB(printf("cs0_bnds = 0x%08x\n",ddr->cs0_bnds));
DEB(printf("cs0_config = 0x%08x\n",ddr->cs0_config));
if ( spd.nrows == 2 ) {
ddr->cs1_bnds = ((spd.row_dens<<14) | ((spd.row_dens>>1) - 1));
ddr->cs1_config = ( 1<<31 | (spd.nrow_addr-12)<<8 | (spd.ncol_addr-8) );
DEB(printf("cs1_bnds = 0x%08x\n",ddr->cs1_bnds));
DEB(printf("cs1_config = 0x%08x\n",ddr->cs1_config));
}
memsize = spd.nrows * (4 * spd.row_dens);
if( spd.mem_type == 0x07 ) {
printf("DDR module detected, total size:%dMB.\n",memsize);
} else {
printf("No DDR module found!\n");
return 0;
}
switch(memsize) {
case 16:
tmp = 7; /* TLB size */
tmp1 = 1; /* TLB entry number */
tmp2 = 23; /* Local Access Window size */
break;
case 32:
tmp = 7;
tmp1 = 2;
tmp2 = 24;
break;
case 64:
tmp = 8;
tmp1 = 1;
tmp2 = 25;
break;
case 128:
tmp = 8;
tmp1 = 2;
tmp2 = 26;
break;
case 256:
tmp = 9;
tmp1 = 1;
tmp2 = 27;
break;
case 512:
tmp = 9;
tmp1 = 2;
tmp2 = 28;
break;
case 1024:
tmp = 10;
tmp1 = 1;
tmp2 = 29;
break;
default:
printf("DDR:we only added support 16M,32M,64M,128M,256M,512M and 1G DDR I.\n");
return 0;
break;
}
/* configure DDR TLB to TLB1 Entry 4,5 */
mtspr(MAS0, TLB1_MAS0(1,4,0));
mtspr(MAS1, TLB1_MAS1(1,1,0,0,tmp));
mtspr(MAS2, TLB1_MAS2(((CFG_DDR_SDRAM_BASE>>12) & 0xfffff),0,0,0,0,0,0,0,0));
mtspr(MAS3, TLB1_MAS3(((CFG_DDR_SDRAM_BASE>>12) & 0xfffff),0,0,0,0,0,1,0,1,0,1));
asm volatile("isync;msync;tlbwe;isync");
DEB(printf("DDR:MAS0=0x%08x\n",TLB1_MAS0(1,4,0)));
DEB(printf("DDR:MAS1=0x%08x\n",TLB1_MAS1(1,1,0,0,tmp)));
DEB(printf("DDR:MAS2=0x%08x\n",TLB1_MAS2(((CFG_DDR_SDRAM_BASE>>12) \
& 0xfffff),0,0,0,0,0,0,0,0)));
DEB(printf("DDR:MAS3=0x%08x\n",TLB1_MAS3(((CFG_DDR_SDRAM_BASE>>12) \
& 0xfffff),0,0,0,0,0,1,0,1,0,1)));
if(tmp1 == 2) {
mtspr(MAS0, TLB1_MAS0(1,5,0));
mtspr(MAS1, TLB1_MAS1(1,1,0,0,tmp));
mtspr(MAS2, TLB1_MAS2((((CFG_DDR_SDRAM_BASE+(memsize*1024*1024)/2)>>12) \
& 0xfffff),0,0,0,0,0,0,0,0));
mtspr(MAS3, TLB1_MAS3((((CFG_DDR_SDRAM_BASE+(memsize*1024*1024)/2)>>12) \
& 0xfffff),0,0,0,0,0,1,0,1,0,1));
asm volatile("isync;msync;tlbwe;isync");
DEB(printf("DDR:MAS0=0x%08x\n",TLB1_MAS0(1,5,0)));
DEB(printf("DDR:MAS1=0x%08x\n",TLB1_MAS1(1,1,0,0,tmp)));
DEB(printf("DDR:MAS2=0x%08x\n",TLB1_MAS2((((CFG_DDR_SDRAM_BASE \
+(memsize*1024*1024)/2)>>12) & 0xfffff),0,0,0,0,0,0,0,0)));
DEB(printf("DDR:MAS3=0x%08x\n",TLB1_MAS3((((CFG_DDR_SDRAM_BASE \
+(memsize*1024*1024)/2)>>12) & 0xfffff),0,0,0,0,0,1,0,1,0,1)));
}
#if defined(CONFIG_RAM_AS_FLASH)
ecm->lawbar2 = ((CFG_DDR_SDRAM_BASE>>12) & 0xfffff);
ecm->lawar2 = (LAWAR_EN | LAWAR_TRGT_IF_DDR | (LAWAR_SIZE & tmp2));
DEB(printf("DDR:LAWBAR2=0x%08x\n",ecm->lawbar2));
DEB(printf("DDR:LARAR2=0x%08x\n",ecm->lawar2));
#else
ecm->lawbar1 = ((CFG_DDR_SDRAM_BASE>>12) & 0xfffff);
ecm->lawar1 = (LAWAR_EN | LAWAR_TRGT_IF_DDR | (LAWAR_SIZE & tmp2));
DEB(printf("DDR:LAWBAR1=0x%08x\n",ecm->lawbar1));
DEB(printf("DDR:LARAR1=0x%08x\n",ecm->lawar1));
#endif
tmp = 20000/(((spd.clk_cycle & 0xF0) >> 4) * 10 + (spd.clk_cycle & 0x0f));
DEB(printf("DDR:Module maximum data rate is: %dMhz\n",tmp));
/* find the largest CAS */
if(spd.cas_lat & 0x40) {
caslat = 7;
} else if (spd.cas_lat & 0x20) {
caslat = 6;
} else if (spd.cas_lat & 0x10) {
caslat = 5;
} else if (spd.cas_lat & 0x08) {
caslat = 4;
} else if (spd.cas_lat & 0x04) {
caslat = 3;
} else if (spd.cas_lat & 0x02) {
caslat = 2;
} else if (spd.cas_lat & 0x01) {
caslat = 1;
} else {
printf("DDR:no valid CAS Latency information.\n");
return 0;
}
tmp1 = get_bus_freq(0)/1000000;
if(tmp1<230 && tmp1>=90 && tmp>=230) { /* 90~230 range, treated as DDR 200 */
if(spd.clk_cycle3 == 0xa0) caslat -= 2;
else if(spd.clk_cycle2 == 0xa0) caslat--;
} else if(tmp1<280 && tmp1>=230 && tmp>=280) { /* 230-280 range, treated as DDR 266 */
if(spd.clk_cycle3 == 0x75) caslat -= 2;
else if(spd.clk_cycle2 == 0x75) caslat--;
} else if(tmp1<350 && tmp1>=280 && tmp>=350) { /* 280~350 range, treated as DDR 333 */
if(spd.clk_cycle3 == 0x60) caslat -= 2;
else if(spd.clk_cycle2 == 0x60) caslat--;
} else if(tmp1<90 || tmp1 >=350) { /* DDR rate out-of-range */
printf("DDR:platform frequency is not fit for DDR rate\n");
return 0;
}
/* note: caslat must also be programmed into ddr->sdram_mode register */
/* note: WRREC(Twr) and WRTORD(Twtr) are not in SPD,use conservative value here */
#if 1
ddr->timing_cfg_1 = (((ns2clk(spd.trp/4) & 0x07) << 28 ) | \
((ns2clk(spd.tras) & 0x0f ) << 24 ) | \
((ns2clk(spd.trcd/4) & 0x07) << 20 ) | \
((caslat & 0x07)<< 16 ) | \
(((ns2clk(spd.sset[6]) - 8) & 0x0f) << 12 ) | \
( 0x300 ) | \
((ns2clk(spd.trrd/4) & 0x07) << 4) | 1);
#else
ddr->timing_cfg_1 = 0x37344321;
caslat = 4;
#endif
DEB(printf("DDR:timing_cfg_1=0x%08x\n",ddr->timing_cfg_1));
/* note: hand-coded value for timing_cfg_2, see Errata DDR1*/
#if defined(CONFIG_MPC85xx_REV1)
ddr->timing_cfg_2 = 0x00000800;
#endif
DEB(printf("DDR:timing_cfg_2=0x%08x\n",ddr->timing_cfg_2));
/* only DDR I is supported, DDR I and II have different mode-register-set definition */
/* burst length is always 4 */
switch(caslat) {
case 2:
ddr->sdram_mode = 0x52; /* 1.5 */
break;
case 3:
ddr->sdram_mode = 0x22; /* 2.0 */
break;
case 4:
ddr->sdram_mode = 0x62; /* 2.5 */
break;
case 5:
ddr->sdram_mode = 0x32; /* 3.0 */
break;
default:
printf("DDR:only CAS Latency 1.5,2.0,2.5,3.0 is supported.\n");
return 0;
}
DEB(printf("DDR:sdram_mode=0x%08x\n",ddr->sdram_mode));
switch(spd.refresh) {
case 0x00:
case 0x80:
tmp = ns2clk(15625);
break;
case 0x01:
case 0x81:
tmp = ns2clk(3900);
break;
case 0x02:
case 0x82:
tmp = ns2clk(7800);
break;
case 0x03:
case 0x83:
tmp = ns2clk(31300);
break;
case 0x04:
case 0x84:
tmp = ns2clk(62500);
break;
case 0x05:
case 0x85:
tmp = ns2clk(125000);
break;
default:
tmp = 0x512;
break;
}
/* set BSTOPRE to 0x100 for page mode, if auto-charge is used, set BSTOPRE = 0 */
ddr->sdram_interval = ((tmp & 0x3fff) << 16) | 0x100;
DEB(printf("DDR:sdram_interval=0x%08x\n",ddr->sdram_interval));
/* is this an ECC DDR chip? */
#if defined(CONFIG_DDR_ECC)
if(spd.config == 0x02) {
ddr->err_disable = 0x0000000d;
ddr->err_sbe = 0x00ff0000;
}
DEB(printf("DDR:err_disable=0x%08x\n",ddr->err_disable));
DEB(printf("DDR:err_sbe=0x%08x\n",ddr->err_sbe));
#endif
asm("sync;isync;msync");
udelay(500);
/* registered or unbuffered? */
#if defined(CONFIG_DDR_ECC)
ddr->sdram_cfg = (spd.config == 0x02)?0x20000000:0x0;
#endif
ddr->sdram_cfg = 0xc2000000|((spd.mod_attr == 0x20) ? 0x0 : \
((spd.mod_attr == 0x26) ? 0x10000000:0x0));
asm("sync;isync;msync");
udelay(500);
DEB(printf("DDR:sdram_cfg=0x%08x\n",ddr->sdram_cfg));
return (memsize*1024*1024);
}
#endif /* CONFIG_SPD_EEPROM */