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06fd66a4aa
Add Sysam Amcore m68k-based board support. Signed-off-by: Angelo Dureghello <angelo@sysam.it>
102 lines
2.1 KiB
C
102 lines
2.1 KiB
C
/*
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* Board functions for Sysam AMCORE (MCF5307 based) board
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*
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* (C) Copyright 2015 Angelo Dureghello <angelo@sysam.it>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*
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* This file copies memory testdram() from sandburst/common/sb_common.c
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*/
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#include <common.h>
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#include <asm/immap.h>
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#include <asm/io.h>
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void init_lcd(void)
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{
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/* setup for possible K0108 lcd connected on the parallel port */
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sim_t *sim = (sim_t *)(MMAP_SIM);
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out_be16(&sim->par, 0x300);
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gpio_t *gpio = (gpio_t *)(MMAP_GPIO);
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out_be16(&gpio->paddr, 0xfcff);
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out_be16(&gpio->padat, 0x0c00);
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}
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int checkboard(void)
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{
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puts("Board: ");
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puts("AMCORE v.001(alpha)\n");
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init_lcd();
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return 0;
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}
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/*
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* in initdram we are here executing from flash
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* case 1:
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* is with no ACR/flash cache enabled
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* nop = 40ns (scope measured)
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*/
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void fudelay(int usec)
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{
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while (usec--)
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asm volatile ("nop");
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}
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phys_size_t initdram(int board_type)
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{
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u32 dramsize, RC;
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sdramctrl_t *dc = (sdramctrl_t *)(MMAP_DRAMC);
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/*
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* SDRAM MT48LC4M32B2 details
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* Memory block 0: 16 MB of SDRAM at address $00000000
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* Port size: 32-bit port
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*
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* Memory block 0 wired as follows:
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* CPU : A15 A14 A13 A12 A11 A10 A9 A17 A18 A19 A20 A21 A22 A23
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* SDRAM : A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 BA0 BA1
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*
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* Ensure that there is a delay of at least 100 microseconds from
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* processor reset to the following code so that the SDRAM is ready
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* for commands.
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*/
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fudelay(100);
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/*
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* DCR
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* set proper RC as per specification
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*/
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RC = (CONFIG_SYS_CPU_CLK / 1000000) >> 1;
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RC = (RC * 15) >> 4;
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/* 0x8000 is the faster option */
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out_be16(&dc->dcr, 0x8200 | RC);
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/*
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* DACR0, page mode continuous, CMD on A20 0x0300
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*/
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out_be32(&dc->dacr0, 0x00003304);
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dramsize = ((CONFIG_SYS_SDRAM_SIZE)-1) & 0xfffc0000;
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out_be32(&dc->dmr0, dramsize|1);
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/* issue a PRECHARGE ALL */
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out_be32(&dc->dacr0, 0x0000330c);
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out_be32((u32 *)0x00000004, 0xbeaddeed);
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/* issue AUTOREFRESH */
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out_be32(&dc->dacr0, 0x0000b304);
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/* let refresh occour */
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fudelay(1);
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out_be32(&dc->dacr0, 0x0000b344);
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out_be32((u32 *)0x00000c00, 0xbeaddeed);
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return get_ram_size(CONFIG_SYS_SDRAM_BASE, CONFIG_SYS_SDRAM_SIZE);
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}
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