diff options
| author | York Sun <yorksun@freescale.com> | 2012-08-17 08:22:36 +0000 |
|---|---|---|
| committer | Andy Fleming <afleming@freescale.com> | 2012-08-23 12:16:55 -0500 |
| commit | 744713a6a3ca19c77585a9452829a2e2a55693ad (patch) | |
| tree | 3c2b3c02c6baa62186f6d0e55f036855428729f2 /arch/powerpc/cpu/mpc85xx/ddr-gen3.c | |
| parent | 709389b654de05fd6035656f5e082ba1757807b3 (diff) | |
powerpc/mpc85xx: Skip zero values for DDR debug registers
Some debug registers have non-zero default out of reset. If software is
not setting debug registers, skip writing to them to avoid unnecessary
overriding.
Also add debug messages for workarounds and debug registers.
Signed-off-by: York Sun <yorksun@freescale.com>
Signed-off-by: Andy Fleming <afleming@freescale.com>
Diffstat (limited to 'arch/powerpc/cpu/mpc85xx/ddr-gen3.c')
| -rw-r--r-- | arch/powerpc/cpu/mpc85xx/ddr-gen3.c | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/arch/powerpc/cpu/mpc85xx/ddr-gen3.c b/arch/powerpc/cpu/mpc85xx/ddr-gen3.c index 81961def1..0761d7008 100644 --- a/arch/powerpc/cpu/mpc85xx/ddr-gen3.c +++ b/arch/powerpc/cpu/mpc85xx/ddr-gen3.c @@ -1,5 +1,5 @@ /* - * Copyright 2008-2011 Freescale Semiconductor, Inc. + * Copyright 2008-2012 Freescale Semiconductor, Inc. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License @@ -43,6 +43,7 @@ void fsl_ddr_set_memctl_regs(const fsl_ddr_cfg_regs_t *regs, out_be32(&ddr->eor, regs->ddr_eor); #ifdef CONFIG_SYS_FSL_ERRATUM_DDR111_DDR134 + debug("Workaround for ERRATUM_DDR111_DDR134\n"); for (i = 0; i < CONFIG_CHIP_SELECTS_PER_CTRL; i++) { cs_sa = (regs->cs[i].bnds >> 16) & 0xfff; cs_ea = regs->cs[i].bnds & 0xfff; @@ -115,8 +116,12 @@ void fsl_ddr_set_memctl_regs(const fsl_ddr_cfg_regs_t *regs, out_be32(&ddr->ddr_cdr2, regs->ddr_cdr2); out_be32(&ddr->err_disable, regs->err_disable); out_be32(&ddr->err_int_en, regs->err_int_en); - for (i = 0; i < 32; i++) - out_be32(&ddr->debug[i], regs->debug[i]); + for (i = 0; i < 32; i++) { + if (regs->debug[i]) { + debug("Write to debug_%d as %08x\n", i+1, regs->debug[i]); + out_be32(&ddr->debug[i], regs->debug[i]); + } + } #ifdef CONFIG_SYS_FSL_ERRATUM_DDR_A003474 out_be32(&ddr->debug[12], 0x00000015); @@ -128,6 +133,7 @@ void fsl_ddr_set_memctl_regs(const fsl_ddr_cfg_regs_t *regs, temp_sdram_cfg &= ~(SDRAM_CFG_MEM_EN); out_be32(&ddr->sdram_cfg, temp_sdram_cfg); #ifdef CONFIG_SYS_FSL_ERRATUM_DDR_A003 + debug("Workaround for ERRATUM_DDR_A003\n"); if (regs->ddr_sdram_rcw_2 & 0x00f00000) { out_be32(&ddr->timing_cfg_2, regs->timing_cfg_2 & 0xf07fffff); out_be32(&ddr->debug[2], 0x00000400); @@ -209,6 +215,7 @@ void fsl_ddr_set_memctl_regs(const fsl_ddr_cfg_regs_t *regs, * This erratum does not affect DDR3 mode, only for DDR2 mode. */ #ifdef CONFIG_SYS_FSL_ERRATUM_DDR_115 + debug("Workaround for ERRATUM_DDR_115\n"); if ((((in_be32(&ddr->sdram_cfg) >> 24) & 0x7) == SDRAM_TYPE_DDR2) && in_be32(&ddr->sdram_cfg) & 0x80000) { /* set DEBUG_1[31] */ @@ -216,6 +223,7 @@ void fsl_ddr_set_memctl_regs(const fsl_ddr_cfg_regs_t *regs, } #endif #ifdef CONFIG_SYS_FSL_ERRATUM_DDR111_DDR134 + debug("Workaround for ERRATUM_DDR111_DDR134\n"); /* * This is the combined workaround for DDR111 and DDR134 * following the published errata for MPC8572 |