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Diffstat (limited to 'board/total5200/sdram.c')
| -rw-r--r-- | board/total5200/sdram.c | 227 |
1 files changed, 227 insertions, 0 deletions
diff --git a/board/total5200/sdram.c b/board/total5200/sdram.c new file mode 100644 index 0000000..367c826 --- /dev/null +++ b/board/total5200/sdram.c @@ -0,0 +1,227 @@ +/* + * (C) Copyright 2003-2004 + * Wolfgang Denk, DENX Software Engineering, wd@denx.de. + * + * (C) Copyright 2004 + * Mark Jonas, Freescale Semiconductor, mark.jonas@freescale.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 <mpc5xxx.h> + +#include "sdram.h" + +#ifndef CFG_RAMBOOT +static void mpc5xxx_sdram_start (sdram_conf_t *sdram_conf, int hi_addr) +{ + long hi_addr_bit = hi_addr ? 0x01000000 : 0; + + /* unlock mode register */ + *(vu_long *)MPC5XXX_SDRAM_CTRL = sdram_conf->control | 0x80000000 | hi_addr_bit; + __asm__ volatile ("sync"); + + /* precharge all banks */ + *(vu_long *)MPC5XXX_SDRAM_CTRL = sdram_conf->control | 0x80000002 | hi_addr_bit; + __asm__ volatile ("sync"); + + if (sdram_conf->ddr) { + /* set mode register: extended mode */ + *(vu_long *)MPC5XXX_SDRAM_MODE = sdram_conf->emode; + __asm__ volatile ("sync"); + + /* set mode register: reset DLL */ + *(vu_long *)MPC5XXX_SDRAM_MODE = sdram_conf->mode | 0x04000000; + __asm__ volatile ("sync"); + } + + /* precharge all banks */ + *(vu_long *)MPC5XXX_SDRAM_CTRL = sdram_conf->control | 0x80000002 | hi_addr_bit; + __asm__ volatile ("sync"); + + /* auto refresh */ + *(vu_long *)MPC5XXX_SDRAM_CTRL = sdram_conf->control | 0x80000004 | hi_addr_bit; + __asm__ volatile ("sync"); + + /* set mode register */ + *(vu_long *)MPC5XXX_SDRAM_MODE = sdram_conf->mode; + __asm__ volatile ("sync"); + + /* normal operation */ + *(vu_long *)MPC5XXX_SDRAM_CTRL = sdram_conf->control | hi_addr_bit; + __asm__ volatile ("sync"); +} +#endif + +/* + * ATTENTION: Although partially referenced initdram does NOT make real use + * use of CFG_SDRAM_BASE. The code does not work if CFG_SDRAM_BASE + * is something else than 0x00000000. + */ + +#if defined(CONFIG_MPC5200) +long int mpc5xxx_sdram_init (sdram_conf_t *sdram_conf) +{ + ulong dramsize = 0; + ulong dramsize2 = 0; +#ifndef CFG_RAMBOOT + ulong test1, test2; + + /* setup SDRAM chip selects */ + *(vu_long *)MPC5XXX_SDRAM_CS0CFG = 0x0000001e;/* 2G at 0x0 */ + *(vu_long *)MPC5XXX_SDRAM_CS1CFG = 0x80000000;/* disabled */ + __asm__ volatile ("sync"); + + /* setup config registers */ + *(vu_long *)MPC5XXX_SDRAM_CONFIG1 = sdram_conf->config1; + *(vu_long *)MPC5XXX_SDRAM_CONFIG2 = sdram_conf->config2; + __asm__ volatile ("sync"); + + if (sdram_conf->ddr) { + /* set tap delay */ + *(vu_long *)MPC5XXX_CDM_PORCFG = sdram_conf->tapdelay; + __asm__ volatile ("sync"); + } + + /* find RAM size using SDRAM CS0 only */ + mpc5xxx_sdram_start(sdram_conf, 0); + test1 = get_ram_size((ulong *)CFG_SDRAM_BASE, 0x80000000); + mpc5xxx_sdram_start(sdram_conf, 1); + test2 = get_ram_size((ulong *)CFG_SDRAM_BASE, 0x80000000); + if (test1 > test2) { + mpc5xxx_sdram_start(sdram_conf, 0); + dramsize = test1; + } else { + dramsize = test2; + } + + /* memory smaller than 1MB is impossible */ + if (dramsize < (1 << 20)) { + dramsize = 0; + } + + /* set SDRAM CS0 size according to the amount of RAM found */ + if (dramsize > 0) { + *(vu_long *)MPC5XXX_SDRAM_CS0CFG = 0x13 + __builtin_ffs(dramsize >> 20) - 1; + } else { + *(vu_long *)MPC5XXX_SDRAM_CS0CFG = 0; /* disabled */ + } + + /* let SDRAM CS1 start right after CS0 */ + *(vu_long *)MPC5XXX_SDRAM_CS1CFG = dramsize + 0x0000001e;/* 2G */ + + /* find RAM size using SDRAM CS1 only */ + mpc5xxx_sdram_start(sdram_conf, 0); + test1 = get_ram_size((ulong *)(CFG_SDRAM_BASE + dramsize), 0x80000000); + mpc5xxx_sdram_start(sdram_conf, 1); + test2 = get_ram_size((ulong *)(CFG_SDRAM_BASE + dramsize), 0x80000000); + if (test1 > test2) { + mpc5xxx_sdram_start(sdram_conf, 0); + dramsize2 = test1; + } else { + dramsize2 = test2; + } + + /* memory smaller than 1MB is impossible */ + if (dramsize2 < (1 << 20)) { + dramsize2 = 0; + } + + /* set SDRAM CS1 size according to the amount of RAM found */ + if (dramsize2 > 0) { + *(vu_long *)MPC5XXX_SDRAM_CS1CFG = dramsize + | (0x13 + __builtin_ffs(dramsize2 >> 20) - 1); + } else { + *(vu_long *)MPC5XXX_SDRAM_CS1CFG = dramsize; /* disabled */ + } + +#else /* CFG_RAMBOOT */ + + /* retrieve size of memory connected to SDRAM CS0 */ + dramsize = *(vu_long *)MPC5XXX_SDRAM_CS0CFG & 0xFF; + if (dramsize >= 0x13) { + dramsize = (1 << (dramsize - 0x13)) << 20; + } else { + dramsize = 0; + } + + /* retrieve size of memory connected to SDRAM CS1 */ + dramsize2 = *(vu_long *)MPC5XXX_SDRAM_CS1CFG & 0xFF; + if (dramsize2 >= 0x13) { + dramsize2 = (1 << (dramsize2 - 0x13)) << 20; + } else { + dramsize2 = 0; + } + +#endif /* CFG_RAMBOOT */ + + return dramsize + dramsize2; +} + +#elif defined(CONFIG_MGT5100) + +long int mpc5xxx_sdram_init (sdram_conf_t *sdram_conf) +{ + ulong dramsize = 0; +#ifndef CFG_RAMBOOT + ulong test1, test2; + + /* setup and enable SDRAM chip selects */ + *(vu_long *)MPC5XXX_SDRAM_START = 0x00000000; + *(vu_long *)MPC5XXX_SDRAM_STOP = 0x0000ffff;/* 2G */ + *(vu_long *)MPC5XXX_ADDECR |= (1 << 22); /* Enable SDRAM */ + __asm__ volatile ("sync"); + + /* setup config registers */ + *(vu_long *)MPC5XXX_SDRAM_CONFIG1 = sdram_conf->config1; + *(vu_long *)MPC5XXX_SDRAM_CONFIG2 = sdram_conf->config2; + + /* address select register */ + *(vu_long *)MPC5XXX_SDRAM_XLBSEL = sdram_conf->addrsel; + __asm__ volatile ("sync"); + + /* find RAM size */ + mpc5xxx_sdram_start(sdram_conf, 0); + test1 = get_ram_size((ulong *)CFG_SDRAM_BASE, 0x80000000); + mpc5xxx_sdram_start(sdram_conf, 1); + test2 = get_ram_size((ulong *)CFG_SDRAM_BASE, 0x80000000); + if (test1 > test2) { + mpc5xxx_sdram_start(sdram_conf, 0); + dramsize = test1; + } else { + dramsize = test2; + } + + /* set SDRAM end address according to size */ + *(vu_long *)MPC5XXX_SDRAM_STOP = ((dramsize - 1) >> 15); + +#else /* CFG_RAMBOOT */ + + /* Retrieve amount of SDRAM available */ + dramsize = ((*(vu_long *)MPC5XXX_SDRAM_STOP + 1) << 15); + +#endif /* CFG_RAMBOOT */ + + return dramsize; +} + +#else +#error Neither CONFIG_MPC5200 or CONFIG_MGT5100 defined +#endif |