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Diffstat (limited to 'board/lantec/lantec.c')
| -rw-r--r-- | board/lantec/lantec.c | 236 |
1 files changed, 236 insertions, 0 deletions
diff --git a/board/lantec/lantec.c b/board/lantec/lantec.c new file mode 100644 index 0000000..812f65a --- /dev/null +++ b/board/lantec/lantec.c @@ -0,0 +1,236 @@ +/* + * (C) Copyright 2000, 2001 + * Wolfgang Denk, DENX Software Engineering, wd@denx.de. + * (C) Copyright 2001 + * Torsten Stevens, FHG IMS, stevens@ims.fhg.de + * Bruno Achauer, Exet AG, bruno@exet-ag.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 + */ + +/* + * Derived from ../tqm8xx/tqm8xx.c + */ + +#include <common.h> +#include <mpc8xx.h> + +/* ------------------------------------------------------------------------- */ + +static long int dram_size (long int, long int *, long int); + +/* ------------------------------------------------------------------------- */ + +#define _NOT_USED_ 0xFFFFFFFF + +const uint sdram_table[] = +{ + /* + * Single Read. (Offset 0 in UPMA RAM) + */ + 0x1f07fc04, 0xeeaefc04, 0x11adfc04, 0xefbbbc00, + 0x1ff77c47, /* last */ + /* + * SDRAM Initialization (offset 5 in UPMA RAM) + * + * This is no UPM entry point. The following definition uses + * the remaining space to establish an initialization + * sequence, which is executed by a RUN command. + * + */ + 0x1ff77c35, 0xefeabc34, 0x1fb57c35, /* last */ + /* + * Burst Read. (Offset 8 in UPMA RAM) + */ + 0x1f07fc04, 0xeeaefc04, 0x10adfc04, 0xf0affc00, + 0xf0affc00, 0xf1affc00, 0xefbbbc00, 0x1ff77c47, /* last */ + _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_, + _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_, + /* + * Single Write. (Offset 18 in UPMA RAM) + */ + 0x1f27fc04, 0xeeaebc00, 0x01b93c04, 0x1ff77c47, /* last */ + _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_, + /* + * Burst Write. (Offset 20 in UPMA RAM) + */ + 0x1f07fc04, 0xeeaebc00, 0x10ad7c00, 0xf0affc00, + 0xf0affc00, 0xe1bbbc04, 0x1ff77c47, /* last */ + _NOT_USED_, + _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_, + _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_, + /* + * Refresh (Offset 30 in UPMA RAM) + */ + 0x1ff5fc84, 0xfffffc04, 0xfffffc04, 0xfffffc04, + 0xfffffc84, 0xfffffc07, 0xfffffc07, /* last */ + _NOT_USED_, + _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_, + /* + * Exception. (Offset 3c in UPMA RAM) + */ + 0x7ffffc07, /* last */ + _NOT_USED_, _NOT_USED_, _NOT_USED_, +}; + +/* ------------------------------------------------------------------------- */ + + +/* + * Check Board Identity: + * + * Test TQ ID string (TQM8xx...) + * If present, check for "L" type (no second DRAM bank), + * otherwise "L" type is assumed as default. + * + * Return 1 for "L" type, 0 else. + */ + +int checkboard (void) +{ + printf("Board: Lantec special edition rev.%d\n", CONFIG_LANTEC); + return 0; +} + +/* ------------------------------------------------------------------------- */ + +long int initdram (int board_type) +{ + volatile immap_t *immap = (immap_t *)CFG_IMMR; + volatile memctl8xx_t *memctl = &immap->im_memctl; + long int size_b0; + int i; + + /* + * Configure UPMA for SDRAM + */ + upmconfig(UPMA, (uint *)sdram_table, sizeof(sdram_table)/sizeof(uint)); + + memctl->memc_mptpr = CFG_MPTPR_1BK_8K /* XXX CFG_MPTPR XXX */; + + /* burst length=4, burst type=sequential, CAS latency=2 */ + memctl->memc_mar = 0x00000088; + + /* + * Map controller bank 3 to the SDRAM bank at preliminary address. + */ + memctl->memc_or3 = CFG_OR3_PRELIM; + memctl->memc_br3 = CFG_BR3_PRELIM; + + /* initialize memory address register */ + memctl->memc_mamr = CFG_MAMR_8COL; /* refresh not enabled yet */ + + /* mode initialization (offset 5) */ + udelay(200); /* 0x80006105 */ + memctl->memc_mcr = MCR_OP_RUN | MCR_MB_CS3 | MCR_MLCF(1) | MCR_MAD(0x05); + + /* run 2 refresh sequence with 4-beat refresh burst (offset 0x30) */ + udelay(1); /* 0x80006130 */ + memctl->memc_mcr = MCR_OP_RUN | MCR_MB_CS3 | MCR_MLCF(1) | MCR_MAD(0x30); + udelay(1); /* 0x80006130 */ + memctl->memc_mcr = MCR_OP_RUN | MCR_MB_CS3 | MCR_MLCF(1) | MCR_MAD(0x30); + + udelay(1); /* 0x80006106 */ + memctl->memc_mcr = MCR_OP_RUN | MCR_MB_CS3 | MCR_MLCF(1) | MCR_MAD(0x06); + + memctl->memc_mamr |= MAMR_PTBE; /* refresh enabled */ + + udelay(200); + + /* Need at least 10 DRAM accesses to stabilize */ + for (i=0; i<10; ++i) { + volatile unsigned long *addr = \ + (volatile unsigned long *)SDRAM_BASE3_PRELIM; + unsigned long val; + + val = *(addr + i); + *(addr + i) = val; + } + + /* + * Check Bank 0 Memory Size for re-configuration + */ + size_b0 = dram_size (CFG_MAMR_8COL, + (ulong *)SDRAM_BASE3_PRELIM, + SDRAM_MAX_SIZE); + + memctl->memc_mamr = CFG_MAMR_8COL | MAMR_PTBE; + + /* + * Final mapping: + */ + + memctl->memc_or3 = ((-size_b0) & 0xFFFF0000) | CFG_OR_TIMING_SDRAM; + memctl->memc_br3 = (CFG_SDRAM_BASE & BR_BA_MSK) | BR_MS_UPMA | BR_V; + udelay(1000); + + return (size_b0); +} + +/* ------------------------------------------------------------------------- */ + +/* + * Check memory range for valid RAM. A simple memory test determines + * the actually available RAM size between addresses `base' and + * `base + maxsize'. Some (not all) hardware errors are detected: + * - short between address lines + * - short between data lines + */ + +static long int dram_size (long int mamr_value, long int *base, long int maxsize) +{ + volatile immap_t *immap = (immap_t *)CFG_IMMR; + volatile memctl8xx_t *memctl = &immap->im_memctl; + volatile long int *addr; + ulong cnt, val; + ulong save[32]; /* to make test non-destructive */ + unsigned char i = 0; + + memctl->memc_mamr = mamr_value; + + for (cnt = maxsize/sizeof(long); cnt > 0; cnt >>= 1) { + addr = base + cnt; /* pointer arith! */ + + save[i++] = *addr; + *addr = ~cnt; + } + + /* write 0 to base address */ + addr = base; + save[i] = *addr; + *addr = 0; + + /* check at base address */ + if ((val = *addr) != 0) { + *addr = save[i]; + return (0); + } + + for (cnt = 1; cnt <= maxsize/sizeof(long); cnt <<= 1) { + addr = base + cnt; /* pointer arith! */ + + val = *addr; + *addr = save[--i]; + + if (val != (~cnt)) { + return (cnt * sizeof(long)); + } + } + return (maxsize); +} |