/* * (C) Copyright 2000-2003 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. * * Copyright (C) 2004-2007 Freescale Semiconductor, Inc. * TsiChung Liew (Tsi-Chung.Liew@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 <config.h> #include <common.h> #include <asm/immap.h> DECLARE_GLOBAL_DATA_PTR; int checkboard(void) { puts("Board: "); puts("Freescale M5235 EVB\n"); return 0; }; phys_size_t initdram(int board_type) { volatile sdram_t *sdram = (volatile sdram_t *)(MMAP_SDRAM); volatile gpio_t *gpio = (volatile gpio_t *)(MMAP_GPIO); u32 dramsize, i, dramclk; /* * When booting from external Flash, the port-size is less than * the port-size of SDRAM. In this case it is necessary to enable * Data[15:0] on Port Address/Data. */ gpio->par_ad = GPIO_PAR_AD_ADDR23 | GPIO_PAR_AD_ADDR22 | GPIO_PAR_AD_ADDR21 | GPIO_PAR_AD_DATAL; /* Initialize PAR to enable SDRAM signals */ gpio->par_sdram = GPIO_PAR_SDRAM_SDWE | GPIO_PAR_SDRAM_SCAS | GPIO_PAR_SDRAM_SRAS | GPIO_PAR_SDRAM_SCKE | GPIO_PAR_SDRAM_SDCS(3); dramsize = CFG_SDRAM_SIZE * 0x100000; for (i = 0x13; i < 0x20; i++) { if (dramsize == (1 << i)) break; } i--; if (!(sdram->dacr0 & SDRAMC_DARCn_RE)) { dramclk = gd->bus_clk / (CFG_HZ * CFG_HZ); /* Initialize DRAM Control Register: DCR */ sdram->dcr = SDRAMC_DCR_RTIM_9CLKS | SDRAMC_DCR_RTIM_6CLKS | SDRAMC_DCR_RC((15 * dramclk) >> 4); /* Initialize DACR0 */ sdram->dacr0 = SDRAMC_DARCn_BA(CFG_SDRAM_BASE) | SDRAMC_DARCn_CASL_C1 | SDRAMC_DARCn_CBM_CMD20 | SDRAMC_DARCn_PS_32; asm("nop"); /* Initialize DMR0 */ sdram->dmr0 = ((dramsize - 1) & 0xFFFC0000) | SDRAMC_DMRn_V; asm("nop"); /* Set IP (bit 3) in DACR */ sdram->dacr0 |= SDRAMC_DARCn_IP; /* Wait 30ns to allow banks to precharge */ for (i = 0; i < 5; i++) { asm("nop"); } /* Write to this block to initiate precharge */ *(u32 *) (CFG_SDRAM_BASE) = 0xA5A59696; /* Set RE (bit 15) in DACR */ sdram->dacr0 |= SDRAMC_DARCn_RE; /* Wait for at least 8 auto refresh cycles to occur */ for (i = 0; i < 0x2000; i++) { asm("nop"); } /* Finish the configuration by issuing the MRS. */ sdram->dacr0 |= SDRAMC_DARCn_IMRS; asm("nop"); /* Write to the SDRAM Mode Register */ *(u32 *) (CFG_SDRAM_BASE + 0x400) = 0xA5A59696; } return dramsize; }; int testdram(void) { /* TODO: XXX XXX XXX */ printf("DRAM test not implemented!\n"); return (0); }