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Diffstat (limited to 'board/adderII/adderII.c')
| -rw-r--r-- | board/adderII/adderII.c | 189 |
1 files changed, 189 insertions, 0 deletions
diff --git a/board/adderII/adderII.c b/board/adderII/adderII.c new file mode 100644 index 0000000..d398e54 --- /dev/null +++ b/board/adderII/adderII.c @@ -0,0 +1,189 @@ +/* + * (C) Copyright 2000-2003 + * Wolfgang Denk, DENX Software Engineering, wd@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 <config.h> +#include <mpc8xx.h> + +/* + * Check Board Identity: + */ + +int checkboard( void ) +{ + puts("Board: "); + puts("AdderII(MPC852T)\n" ); + + return 0; +} + +#if defined( CONFIG_SDRAM_50MHZ ) + +/****************************************************************************** +** for chip Samsung K4S643232F - T70 +** this table is for 32-50MHz operation +*******************************************************************************/ + +#define SDRAM_MPTPRVALUE 0x0200 + +#define SDRAM_MAMRVALUE0 0x00802114 /* refresh at 32MHz */ +#define SDRAM_MAMRVALUE1 0x00802118 + +#define SDRAM_OR1VALUE 0xff800e00 +#define SDRAM_BR1VALUE 0x00000081 + +#define SDRAM_MARVALUE 94 + +#define SDRAM_MCRVALUE0 0x80808105 +#define SDRAM_MCRVALUE1 0x80808130 + +const uint sdram_table[] = { + + /* single read (offset 0x00 in upm ram) */ + 0x1f07fc24, 0xe0aefc04, 0x10adfc04, 0xe0bbbc00, + 0x10f77c44, 0xf3fffc07, 0xfffffc04, 0xfffffc04, + + /* burst read (offset 0x08 in upm ram) */ + 0x1f07fc24, 0xe0aefc04, 0x10adfc04, 0xf0affc00, + 0xf0affc00, 0xf0affc00, 0xf0affc00, 0x10a77c44, + 0xf7bffc47, 0xfffffc35, 0xfffffc34, 0xfffffc35, + 0xfffffc35, 0x1ff77c35, 0xfffffc34, 0x1fb57c35, + + /* single write (offset 0x18 in upm ram) */ + 0x1f27fc24, 0xe0aebc04, 0x00b93c00, 0x13f77c47, + 0xfffdfc04, 0xfffffc04, 0xfffffc04, 0xfffffc04, + + /* burst write (offset 0x20 in upm ram) */ + 0x1f07fc24, 0xeeaebc00, 0x10ad7c00, 0xf0affc00, + 0xf0affc00, 0xe0abbc00, 0x1fb77c47, 0xfffffc04, + 0xfffffc04, 0xfffffc04, 0xfffffc04, 0xfffffc04, + 0xfffffc04, 0xfffffc04, 0xfffffc04, 0xfffffc04, + + /* refresh (offset 0x30 in upm ram) */ + 0x1ff5fca4, 0xfffffc04, 0xfffffc04, 0xfffffc04, + 0xfffffc84, 0xfffffc07, 0xfffffc04, 0xfffffc04, + 0xfffffc04, 0xfffffc04, 0xfffffc04, 0xfffffc04, + + /* exception (offset 0x3C in upm ram) */ + 0xfffffc27, 0xfffffc04, 0xfffffc04, 0xfffffc04, +}; + +#else +#error SDRAM not correctly configured +#endif + +int _initsdram (uint base, uint noMbytes) +{ + volatile immap_t *immap = (immap_t *) CFG_IMMR; + volatile memctl8xx_t *memctl = &immap->im_memctl; + + if (noMbytes != 8) { + return -1; + } + + upmconfig (UPMA, (uint *) sdram_table, + sizeof (sdram_table) / sizeof (uint)); + + memctl->memc_mptpr = SDRAM_MPTPRVALUE; + + /* Configure the refresh (mostly). This needs to be + * based upon processor clock speed and optimized to provide + * the highest level of performance. For multiple banks, + * this time has to be divided by the number of banks. + * Although it is not clear anywhere, it appears the + * refresh steps through the chip selects for this UPM + * on each refresh cycle. + * We have to be careful changing + * UPM registers after we ask it to run these commands. + */ + + memctl->memc_mamr = (SDRAM_MAMRVALUE0 | (SDRAM_MARVALUE << 24)); + memctl->memc_mar = 0x0; + udelay (200); + + /* Now run the precharge/nop/mrs commands. + */ + memctl->memc_mcr = 0x80002115; + udelay (200); + + /* Run 8 refresh cycles */ + memctl->memc_mcr = 0x80002380; + udelay (200); + + memctl->memc_mar = 0x88; + udelay (200); + + memctl->memc_mcr = 0x80002116; + udelay (200); + + memctl->memc_or1 = SDRAM_OR1VALUE; + memctl->memc_br1 = SDRAM_BR1VALUE | base; + + return 0; +} + +void _sdramdisable( void ) +{ + volatile immap_t *immap = (immap_t *)CFG_IMMR; + volatile memctl8xx_t *memctl = &immap->im_memctl; + + memctl->memc_br1 = 0x00000000; + + /* maybe we should turn off upma here or something */ +} + +int initsdram (uint base, uint * noMbytes) +{ + uint m = 8; + + *noMbytes = m; + + if (!_initsdram (base, m)) { + return 0; + } else { + _sdramdisable (); + return -1; + } +} + +long int initdram (int board_type) +{ + /* AdderII: has 8MB SDRAM */ + uint sdramsz; + uint m = 0; + + if (!initsdram (0x00000000, &sdramsz)) { + m += sdramsz; + } else { + return -1; + } + return (m << 20); +} + +int testdram (void) +{ + /* TODO: XXX XXX XXX not an actual SDRAM test */ + printf ("Test: 8MB SDRAM\n"); + + return (0); +} |