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Diffstat (limited to 'board/jse/sdram.c')
| -rw-r--r-- | board/jse/sdram.c | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/board/jse/sdram.c b/board/jse/sdram.c new file mode 100644 index 0000000..9060d97 --- /dev/null +++ b/board/jse/sdram.c @@ -0,0 +1,182 @@ +/* + * Copyright (c) 2004 Picture Elements, Inc. + * Stephen Williams (steve@icarus.com) + * + * This source code is free software; you can redistribute it + * and/or modify it in source code form 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 <ppc4xx.h> +#include <asm/processor.h> + +# define SDRAM_LEN 0x08000000 + +/* + * this is even after checkboard. It returns the size of the SDRAM + * that we have installed. This function is called by board_init_f + * in lib_ppc/board.c to initialize the memory and return what I + * found. + */ +long int initdram (int board_type) +{ + /* Configure the SDRAMS */ + + /* disable memory controller */ + mtdcr (memcfga, mem_mcopt1); + mtdcr (memcfgd, 0x00000000); + + udelay (500); + + /* Clear SDRAM0_BESR0 (Bus Error Syndrome Register) */ + mtdcr (memcfga, mem_besra); + mtdcr (memcfgd, 0xffffffff); + + /* Clear SDRAM0_BESR1 (Bus Error Syndrome Register) */ + mtdcr (memcfga, mem_besrb); + mtdcr (memcfgd, 0xffffffff); + + /* Clear SDRAM0_ECCCFG (disable ECC) */ + mtdcr (memcfga, mem_ecccf); + mtdcr (memcfgd, 0x00000000); + + /* Clear SDRAM0_ECCESR (ECC Error Syndrome Register) */ + mtdcr (memcfga, mem_eccerr); + mtdcr (memcfgd, 0xffffffff); + + /* Timing register: CASL=2, PTA=2, CTP=2, LDF=1, RFTA=5, RCD=2 */ + mtdcr (memcfga, mem_sdtr1); + mtdcr (memcfgd, 0x010a4016); + + /* Memory Bank 0 Config == BA=0x00000000, SZ=64M, AM=3, BE=1 */ + mtdcr (memcfga, mem_mb0cf); + mtdcr (memcfgd, 0x00084001); + + /* Memory Bank 1 Config == BA=0x04000000, SZ=64M, AM=3, BE=1 */ + mtdcr (memcfga, mem_mb1cf); + mtdcr (memcfgd, 0x04084001); + + /* Memory Bank 2 Config == BE=0 */ + mtdcr (memcfga, mem_mb2cf); + mtdcr (memcfgd, 0x00000000); + + /* Memory Bank 3 Config == BE=0 */ + mtdcr (memcfga, mem_mb3cf); + mtdcr (memcfgd, 0x00000000); + + /* refresh timer = 0x400 */ + mtdcr (memcfga, mem_rtr); + mtdcr (memcfgd, 0x04000000); + + /* Power management idle timer set to the default. */ + mtdcr (memcfga, mem_pmit); + mtdcr (memcfgd, 0x07c00000); + + udelay (500); + + /* Enable banks (DCE=1, BPRF=1, ECCDD=1, EMDUL=1) */ + mtdcr (memcfga, mem_mcopt1); + mtdcr (memcfgd, 0x80e00000); + + return SDRAM_LEN; +} + +/* + * The U-Boot core, as part of the initialization to prepare for + * loading the monitor into SDRAM, requests of this function that the + * memory be tested. Return 0 if the memory tests OK. + */ +int testdram (void) +{ + unsigned long idx; + unsigned val; + unsigned errors; + volatile unsigned long *sdram; + +#ifdef DEBUG + printf ("SDRAM Controller Registers --\n"); + + mtdcr (memcfga, mem_mcopt1); + val = mfdcr (memcfgd); + printf (" SDRAM0_CFG : 0x%08x\n", val); + + mtdcr (memcfga, 0x24); + val = mfdcr (memcfgd); + printf (" SDRAM0_STATUS: 0x%08x\n", val); + + mtdcr (memcfga, mem_mb0cf); + val = mfdcr (memcfgd); + printf (" SDRAM0_B0CR : 0x%08x\n", val); + + mtdcr (memcfga, mem_mb1cf); + val = mfdcr (memcfgd); + printf (" SDRAM0_B1CR : 0x%08x\n", val); + + mtdcr (memcfga, mem_sdtr1); + val = mfdcr (memcfgd); + printf (" SDRAM0_TR : 0x%08x\n", val); + + mtdcr (memcfga, mem_rtr); + val = mfdcr (memcfgd); + printf (" SDRAM0_RTR : 0x%08x\n", val); +#endif + + /* Wait for memory to be ready by testing MRSCMPbit + bit. Really, there should already have been plenty of time, + given it was started long ago. But, best to check. */ + for (idx = 0; idx < 1000000; idx += 1) { + mtdcr (memcfga, 0x24); + val = mfdcr (memcfgd); + if (val & 0x80000000) + break; + } + + if (!(val & 0x80000000)) { + printf ("SDRAM ERROR: SDRAM0_STATUS never set!\n"); + return 1; + } + + /* Start memory test. */ + printf ("test: %u MB - ", SDRAM_LEN / 1048576); + + sdram = (unsigned long *) CFG_SDRAM_BASE; + + printf ("write - "); + for (idx = 2; idx < SDRAM_LEN / 4; idx += 2) { + sdram[idx + 0] = idx; + sdram[idx + 1] = ~idx; + } + + printf ("read - "); + errors = 0; + for (idx = 2; idx < SDRAM_LEN / 4; idx += 2) { + if (sdram[idx + 0] != idx) + errors += 1; + if (sdram[idx + 1] != ~idx) + errors += 1; + if (errors > 0) + break; + } + + if (errors > 0) { + printf ("NOT OK\n"); + printf ("FIRST ERROR at %p: 0x%08lx:0x%08lx != 0x%08lx:0x%08lx\n", + sdram + idx, sdram[idx + 0], sdram[idx + 1], idx, ~idx); + return 1; + } + + printf ("ok\n"); + return 0; +} |