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Diffstat (limited to 'board/tqm85xx/sdram.c')
| -rw-r--r-- | board/tqm85xx/sdram.c | 226 |
1 files changed, 226 insertions, 0 deletions
diff --git a/board/tqm85xx/sdram.c b/board/tqm85xx/sdram.c new file mode 100644 index 0000000..9c1f087 --- /dev/null +++ b/board/tqm85xx/sdram.c @@ -0,0 +1,226 @@ +/* + * (C) Copyright 2005 + * Stefan Roese, DENX Software Engineering, sr@denx.de. + * + * 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 <asm/immap_85xx.h> +#include <asm/processor.h> +#include <asm/mmu.h> +#include <spd.h> + +struct sdram_conf_s { + unsigned long size; + unsigned long reg; +}; + +typedef struct sdram_conf_s sdram_conf_t; + +sdram_conf_t ddr_cs_conf[] = { + {(512 << 20), 0x80000202}, /* 512MB, 14x10(4) */ + {(256 << 20), 0x80000102}, /* 256MB, 13x10(4) */ + {(128 << 20), 0x80000101}, /* 128MB, 13x9(4) */ + {(64 << 20), 0x80000001}, /* 64MB, 12x9(4) */ +}; + +#define N_DDR_CS_CONF (sizeof(ddr_cs_conf) / sizeof(ddr_cs_conf[0])) + +int cas_latency(void); + +/* + * Autodetect onboard DDR SDRAM on 85xx platforms + * + * NOTE: Some of the hardcoded values are hardware dependant, + * so this should be extended for other future boards + * using this routine! + */ +long int sdram_setup(int casl) +{ + int i; + volatile immap_t *immap = (immap_t *) CFG_IMMR; + volatile ccsr_ddr_t *ddr = &immap->im_ddr; + unsigned long cfg_ddr_timing1; + unsigned long cfg_ddr_mode; + + /* + * Disable memory controller. + */ + ddr->cs0_config = 0; + ddr->sdram_cfg = 0; + + switch (casl) { + case 20: + cfg_ddr_timing1 = 0x47405331 | (3 << 16); + cfg_ddr_mode = 0x40020002 | (2 << 4); + break; + + case 25: + cfg_ddr_timing1 = 0x47405331 | (4 << 16); + cfg_ddr_mode = 0x40020002 | (6 << 4); + break; + + case 30: + default: + cfg_ddr_timing1 = 0x47405331 | (5 << 16); + cfg_ddr_mode = 0x40020002 | (3 << 4); + break; + } + + ddr->cs0_bnds = (ddr_cs_conf[0].size - 1) >> 24; + ddr->cs0_config = ddr_cs_conf[0].reg; + ddr->timing_cfg_1 = cfg_ddr_timing1; + ddr->timing_cfg_2 = 0x00000800; /* P9-45,may need tuning */ + ddr->sdram_mode = cfg_ddr_mode; + ddr->sdram_interval = 0x05160100; /* autocharge,no open page */ + ddr->err_disable = 0x0000000D; + + asm ("sync;isync;msync"); + udelay(1000); + + ddr->sdram_cfg = 0xc2000000; /* unbuffered,no DYN_PWR */ + asm ("sync; isync; msync"); + udelay(1000); + + for (i=0; i<N_DDR_CS_CONF; i++) { + ddr->cs0_config = ddr_cs_conf[i].reg; + + if (get_ram_size(0, ddr_cs_conf[i].size) == ddr_cs_conf[i].size) { + /* + * OK, size detected -> all done + */ + return ddr_cs_conf[i].size; + } + } + + return 0; /* nothing found ! */ +} + +void board_add_ram_info(int use_default) +{ + int casl; + + if (use_default) + casl = CONFIG_DDR_DEFAULT_CL; + else + casl = cas_latency(); + + puts(" (CL="); + switch (casl) { + case 20: + puts("2)"); + break; + + case 25: + puts("2.5)"); + break; + + case 30: + puts("3)"); + break; + } +} + +long int initdram (int board_type) +{ + long dram_size = 0; + int casl; + +#if defined(CONFIG_DDR_DLL) + /* + * This DLL-Override only used on TQM8540 and TQM8560 + */ + { + volatile immap_t *immap = (immap_t *) CFG_IMMR; + volatile ccsr_gur_t *gur= &immap->im_gur; + int i,x; + + x = 10; + + /* + * Work around to stabilize DDR DLL + */ + gur->ddrdllcr = 0x81000000; + asm("sync;isync;msync"); + udelay (200); + while (gur->ddrdllcr != 0x81000100) { + gur->devdisr = gur->devdisr | 0x00010000; + asm("sync;isync;msync"); + for (i=0; i<x; i++) + ; + gur->devdisr = gur->devdisr & 0xfff7ffff; + asm("sync;isync;msync"); + x++; + } + } +#endif + + casl = cas_latency(); + dram_size = sdram_setup(casl); + if ((dram_size == 0) && (casl != CONFIG_DDR_DEFAULT_CL)) { + /* + * Try again with default CAS latency + */ + puts("Problem with CAS lantency"); + board_add_ram_info(1); + puts(", using default CL!\n"); + casl = CONFIG_DDR_DEFAULT_CL; + dram_size = sdram_setup(casl); + puts(" "); + } + + return dram_size; +} + +#if defined(CFG_DRAM_TEST) +int testdram (void) +{ + uint *pstart = (uint *) CFG_MEMTEST_START; + uint *pend = (uint *) CFG_MEMTEST_END; + uint *p; + + printf ("SDRAM test phase 1:\n"); + for (p = pstart; p < pend; p++) + *p = 0xaaaaaaaa; + + for (p = pstart; p < pend; p++) { + if (*p != 0xaaaaaaaa) { + printf ("SDRAM test fails at: %08x\n", (uint) p); + return 1; + } + } + + printf ("SDRAM test phase 2:\n"); + for (p = pstart; p < pend; p++) + *p = 0x55555555; + + for (p = pstart; p < pend; p++) { + if (*p != 0x55555555) { + printf ("SDRAM test fails at: %08x\n", (uint) p); + return 1; + } + } + + printf ("SDRAM test passed.\n"); + return 0; +} +#endif |