/* * (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 CONFIG_SYS_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 CONFIG_SYS_SDRAM_BASE. The code does not work if CONFIG_SYS_SDRAM_BASE * is something else than 0x00000000. */ long int mpc5xxx_sdram_init (sdram_conf_t *sdram_conf) { ulong dramsize = 0; ulong dramsize2 = 0; #ifndef CONFIG_SYS_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((long *)CONFIG_SYS_SDRAM_BASE, 0x80000000); mpc5xxx_sdram_start(sdram_conf, 1); test2 = get_ram_size((long *)CONFIG_SYS_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((long *)(CONFIG_SYS_SDRAM_BASE + dramsize), 0x80000000); mpc5xxx_sdram_start(sdram_conf, 1); test2 = get_ram_size((long *)(CONFIG_SYS_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 /* CONFIG_SYS_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 /* CONFIG_SYS_RAMBOOT */ return dramsize + dramsize2; }