2 * Copyright (c) 2008 Nuovation System Designs, LLC
3 * Grant Erickson <gerickson@nuovations.com>
5 * (C) Copyright 2005-2007
6 * Stefan Roese, DENX Software Engineering, sr@denx.de.
9 * Jun Gu, Artesyn Technology, jung@artesyncp.com
12 * Bill Hunter, Wave 7 Optics, williamhunter@attbi.com
14 * See file CREDITS for list of people who contributed to this
17 * This program is free software; you can redistribute it and/or
18 * modify it under the terms of the GNU General Public License as
19 * published by the Free Software Foundation; either version 2 of
20 * the License, or (at your option) any later version.
22 * This program is distributed in the hope that it will abe useful,
23 * but WITHOUT ANY WARRANTY; without even the implied warranty of
24 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
25 * GNU General Public License for more details.
27 * You should have received a copy of the GNU General Public License
28 * along with this program; if not, write to the Free Software
29 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
33 * This file implements generic DRAM ECC initialization for
34 * PowerPC processors using a SDRAM DDR/DDR2 controller,
35 * including the 405EX(r), 440GP/GX/EP/GR, 440SP(E), and
41 #include <ppc_asm.tmpl>
43 #include <asm/processor.h>
48 #if defined(CONFIG_SDRAM_PPC4xx_IBM_DDR) || \
49 defined(CONFIG_SDRAM_PPC4xx_IBM_DDR2)
50 #if defined(CONFIG_DDR_ECC) || defined(CONFIG_SDRAM_ECC)
55 * This routine initializes a range of DRAM ECC memory with known
56 * data and enables ECC checking.
59 * - Improve performance by utilizing cache.
60 * - Further generalize to make usable by other 4xx variants (e.g.
64 * start - A pointer to the start of memory covered by ECC requiring
66 * size - The size, in bytes, of the memory covered by ECC requiring
70 * start - A pointer to the start of memory covered by ECC with
71 * CFG_ECC_PATTERN written to all locations and ECC data
77 void ecc_init(unsigned long * const start, unsigned long size)
79 const unsigned long pattern = CFG_ECC_PATTERN;
80 unsigned long * const end = (unsigned long * const)((long)start + size);
81 unsigned long * current = start;
88 mfsdram(SDRAM_ECC_CFG, mcopt1);
90 /* Enable ECC generation without checking or reporting */
92 mtsdram(SDRAM_ECC_CFG, ((mcopt1 & ~SDRAM_ECC_CFG_MCHK_MASK) |
93 SDRAM_ECC_CFG_MCHK_GEN));
95 increment = sizeof(u32);
97 #if defined(CONFIG_440)
99 * Look at the geometry of SDRAM (data width) to determine whether we
100 * can skip words when writing.
103 if ((mcopt1 & SDRAM_ECC_CFG_DMWD_MASK) != SDRAM_ECC_CFG_DMWD_32)
104 increment = sizeof(u64);
105 #endif /* defined(CONFIG_440) */
107 while (current < end) {
109 current = (unsigned long *)((long)current + increment);
112 /* Wait until the writes are finished. */
116 /* Enable ECC generation with checking and no reporting */
118 mtsdram(SDRAM_ECC_CFG, ((mcopt1 & ~SDRAM_ECC_CFG_MCHK_MASK) |
119 SDRAM_ECC_CFG_MCHK_CHK));
121 #endif /* defined(CONFIG_DDR_ECC) || defined(CONFIG_SDRAM_ECC) */
122 #endif /* defined(CONFIG_SDRAM_PPC4xx_IBM_DDR)... */