diff options
Diffstat (limited to 'arch/powerpc/cpu/ppc4xx/ecc.c')
| -rw-r--r-- | arch/powerpc/cpu/ppc4xx/ecc.c | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/arch/powerpc/cpu/ppc4xx/ecc.c b/arch/powerpc/cpu/ppc4xx/ecc.c new file mode 100644 index 000000000..f10560545 --- /dev/null +++ b/arch/powerpc/cpu/ppc4xx/ecc.c @@ -0,0 +1,185 @@ +/* + * Copyright (c) 2008 Nuovation System Designs, LLC + * Grant Erickson <gerickson@nuovations.com> + * + * (C) Copyright 2005-2009 + * Stefan Roese, DENX Software Engineering, sr@denx.de. + * + * (C) Copyright 2002 + * Jun Gu, Artesyn Technology, jung@artesyncp.com + * + * (C) Copyright 2001 + * Bill Hunter, Wave 7 Optics, williamhunter@attbi.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 abe 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 + * + * Description: + * This file implements generic DRAM ECC initialization for + * PowerPC processors using a SDRAM DDR/DDR2 controller, + * including the 405EX(r), 440GP/GX/EP/GR, 440SP(E), and + * 460EX/GT. + */ + +#include <common.h> +#include <ppc4xx.h> +#include <ppc_asm.tmpl> +#include <ppc_defs.h> +#include <asm/processor.h> +#include <asm/io.h> +#include <asm/mmu.h> +#include <asm/cache.h> + +#include "ecc.h" + +#if defined(CONFIG_SDRAM_PPC4xx_IBM_DDR) || \ + defined(CONFIG_SDRAM_PPC4xx_IBM_DDR2) +#if defined(CONFIG_DDR_ECC) || defined(CONFIG_SDRAM_ECC) + +#if defined(CONFIG_405EX) +/* + * Currently only 405EX uses 16bit data bus width as an alternative + * option to 32bit data width (SDRAM0_MCOPT1_WDTH) + */ +#define SDRAM_DATA_ALT_WIDTH 2 +#else +#define SDRAM_DATA_ALT_WIDTH 8 +#endif + +static void wait_ddr_idle(void) +{ + u32 val; + + do { + mfsdram(SDRAM_MCSTAT, val); + } while ((val & SDRAM_MCSTAT_IDLE_MASK) == SDRAM_MCSTAT_IDLE_NOT); +} + +static void program_ecc_addr(unsigned long start_address, + unsigned long num_bytes, + unsigned long tlb_word2_i_value) +{ + unsigned long current_address; + unsigned long end_address; + unsigned long address_increment; + unsigned long mcopt1; + char str[] = "ECC generation -"; + char slash[] = "\\|/-\\|/-"; + int loop = 0; + int loopi = 0; + + current_address = start_address; + mfsdram(SDRAM_MCOPT1, mcopt1); + if ((mcopt1 & SDRAM_MCOPT1_MCHK_MASK) != SDRAM_MCOPT1_MCHK_NON) { + mtsdram(SDRAM_MCOPT1, + (mcopt1 & ~SDRAM_MCOPT1_MCHK_MASK) | SDRAM_MCOPT1_MCHK_GEN); + sync(); + eieio(); + wait_ddr_idle(); + + puts(str); + +#ifdef CONFIG_440 + if (tlb_word2_i_value == TLB_WORD2_I_ENABLE) { +#endif + /* ECC bit set method for non-cached memory */ + if ((mcopt1 & SDRAM_MCOPT1_DMWD_MASK) == SDRAM_MCOPT1_DMWD_32) + address_increment = 4; + else + address_increment = SDRAM_DATA_ALT_WIDTH; + end_address = current_address + num_bytes; + + while (current_address < end_address) { + *((unsigned long *)current_address) = 0; + current_address += address_increment; + + if ((loop++ % (2 << 20)) == 0) { + putc('\b'); + putc(slash[loopi++ % 8]); + } + } +#ifdef CONFIG_440 + } else { + /* ECC bit set method for cached memory */ + dcbz_area(start_address, num_bytes); + /* Write modified dcache lines back to memory */ + clean_dcache_range(start_address, start_address + num_bytes); + } +#endif /* CONFIG_440 */ + + blank_string(strlen(str)); + + sync(); + eieio(); + wait_ddr_idle(); + + /* clear ECC error repoting registers */ + mtsdram(SDRAM_ECCES, 0xffffffff); + mtdcr(0x4c, 0xffffffff); + + mtsdram(SDRAM_MCOPT1, + (mcopt1 & ~SDRAM_MCOPT1_MCHK_MASK) | SDRAM_MCOPT1_MCHK_CHK_REP); + sync(); + eieio(); + wait_ddr_idle(); + } +} + +#if defined(CONFIG_SDRAM_PPC4xx_IBM_DDR) +void ecc_init(unsigned long * const start, unsigned long size) +{ + /* + * Init ECC with cache disabled (on PPC's with IBM DDR + * controller (non DDR2), not tested with cache enabled yet + */ + program_ecc_addr((u32)start, size, TLB_WORD2_I_ENABLE); +} +#endif + +#if defined(CONFIG_SDRAM_PPC4xx_IBM_DDR2) +void do_program_ecc(unsigned long tlb_word2_i_value) +{ + unsigned long mcopt1; + unsigned long mcopt2; + unsigned long mcstat; + phys_size_t memsize = sdram_memsize(); + + if (memsize > CONFIG_MAX_MEM_MAPPED) { + printf("\nWarning: Can't enable ECC on systems with more than 2GB of SDRAM!\n"); + return; + } + + mfsdram(SDRAM_MCOPT1, mcopt1); + mfsdram(SDRAM_MCOPT2, mcopt2); + + if ((mcopt1 & SDRAM_MCOPT1_MCHK_MASK) != SDRAM_MCOPT1_MCHK_NON) { + /* DDR controller must be enabled and not in self-refresh. */ + mfsdram(SDRAM_MCSTAT, mcstat); + if (((mcopt2 & SDRAM_MCOPT2_DCEN_MASK) == SDRAM_MCOPT2_DCEN_ENABLE) + && ((mcopt2 & SDRAM_MCOPT2_SREN_MASK) == SDRAM_MCOPT2_SREN_EXIT) + && ((mcstat & (SDRAM_MCSTAT_MIC_MASK | SDRAM_MCSTAT_SRMS_MASK)) + == (SDRAM_MCSTAT_MIC_COMP | SDRAM_MCSTAT_SRMS_NOT_SF))) { + + program_ecc_addr(0, memsize, tlb_word2_i_value); + } + } +} +#endif + +#endif /* defined(CONFIG_DDR_ECC) || defined(CONFIG_SDRAM_ECC) */ +#endif /* defined(CONFIG_SDRAM_PPC4xx_IBM_DDR)... */ |