130 lines
3.1 KiB
C
130 lines
3.1 KiB
C
/*
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* (C) Copyright 2003
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <command.h>
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#include <asm/addrspace.h>
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#include <asm/inca-ip.h>
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static ulong max_sdram_size(void)
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{
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/* The only supported SDRAM data width is 16bit.
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*/
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#define CFG_DW 2
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/* The only supported number of SDRAM banks is 4.
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*/
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#define CFG_NB 4
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ulong cfgpb0 = *INCA_IP_SDRAM_MC_CFGPB0;
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int cols = cfgpb0 & 0xF;
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int rows = (cfgpb0 & 0xF0) >> 4;
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ulong size = (1 << (rows + cols)) * CFG_DW * CFG_NB;
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return size;
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}
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/*
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* Check memory range for valid RAM. A simple memory test determines
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* the actually available RAM size between addresses `base' and
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* `base + maxsize'. Some (not all) hardware errors are detected:
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* - short between address lines
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* - short between data lines
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*/
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static long int dram_size(long int *base, long int maxsize)
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{
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volatile long int *addr;
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ulong cnt, val;
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ulong save[32]; /* to make test non-destructive */
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unsigned char i = 0;
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for (cnt = (maxsize / sizeof (long)) >> 1; cnt > 0; cnt >>= 1) {
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addr = base + cnt; /* pointer arith! */
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save[i++] = *addr;
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*addr = ~cnt;
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}
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/* write 0 to base address */
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addr = base;
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save[i] = *addr;
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*addr = 0;
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/* check at base address */
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if ((val = *addr) != 0) {
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*addr = save[i];
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return (0);
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}
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for (cnt = 1; cnt < maxsize / sizeof (long); cnt <<= 1) {
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addr = base + cnt; /* pointer arith! */
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val = *addr;
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*addr = save[--i];
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if (val != (~cnt)) {
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return (cnt * sizeof (long));
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}
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}
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return (maxsize);
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}
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long int initdram(int board_type)
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{
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int rows, cols, best_val = *INCA_IP_SDRAM_MC_CFGPB0;
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ulong size, max_size = 0;
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ulong our_address;
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asm volatile ("move %0, $25" : "=r" (our_address) :);
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/* Can't probe for RAM size unless we are running from Flash.
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*/
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if (PHYSADDR(our_address) < PHYSADDR(PHYS_FLASH_1))
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{
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return max_sdram_size();
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}
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for (cols = 0x8; cols <= 0xC; cols++)
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{
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for (rows = 0xB; rows <= 0xD; rows++)
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{
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*INCA_IP_SDRAM_MC_CFGPB0 = (0x14 << 8) |
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(rows << 4) | cols;
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size = dram_size((ulong *)CFG_SDRAM_BASE,
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max_sdram_size());
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if (size > max_size)
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{
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best_val = *INCA_IP_SDRAM_MC_CFGPB0;
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max_size = size;
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}
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}
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}
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*INCA_IP_SDRAM_MC_CFGPB0 = best_val;
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return max_size;
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}
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