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authorYork Sun <yorksun@freescale.com>2011-01-10 12:03:01 +0000
committerKumar Gala <galak@kernel.crashing.org>2011-01-19 22:58:24 -0600
commitfa8d23c0ee5c66d5cda902ac6ea5b1dfc68d9712 (patch)
tree2e34ca5a60bcaa2468b8989aadee1268aadef831 /arch/powerpc/cpu/mpc85xx
parente1fd16b6f5e80d932c73f5a36141adfb35126e83 (diff)
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mpc85xx: Implement workaround for erratum DDR-A003
Erratum DDR-A003 requires workaround to correctly set RCW10 for registered DIMM. Also adding polling after enabling DDR controller to ensure completion. Signed-off-by: York Sun <yorksun@freescale.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/cpu/mpc85xx')
-rw-r--r--arch/powerpc/cpu/mpc85xx/cmd_errata.c3
-rw-r--r--arch/powerpc/cpu/mpc85xx/ddr-gen3.c81
2 files changed, 83 insertions, 1 deletions
diff --git a/arch/powerpc/cpu/mpc85xx/cmd_errata.c b/arch/powerpc/cpu/mpc85xx/cmd_errata.c
index 7dfa596..0cc8b1e 100644
--- a/arch/powerpc/cpu/mpc85xx/cmd_errata.c
+++ b/arch/powerpc/cpu/mpc85xx/cmd_errata.c
@@ -68,6 +68,9 @@ static int do_errata(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
#ifdef CONFIG_SYS_FSL_ERRATUM_ELBC_A001
puts("Work-around for Erratum ELBC-A001 enabled\n");
#endif
+#ifdef CONFIG_SYS_FSL_ERRATUM_DDR_A003
+ puts("Work-around for Erratum DDR-A003 enabled\n");
+#endif
return 0;
}
diff --git a/arch/powerpc/cpu/mpc85xx/ddr-gen3.c b/arch/powerpc/cpu/mpc85xx/ddr-gen3.c
index 9bc36f3..fa7e09f 100644
--- a/arch/powerpc/cpu/mpc85xx/ddr-gen3.c
+++ b/arch/powerpc/cpu/mpc85xx/ddr-gen3.c
@@ -97,6 +97,82 @@ void fsl_ddr_set_memctl_regs(const fsl_ddr_cfg_regs_t *regs,
temp_sdram_cfg = regs->ddr_sdram_cfg;
temp_sdram_cfg &= ~(SDRAM_CFG_MEM_EN);
out_be32(&ddr->sdram_cfg, temp_sdram_cfg);
+#ifdef CONFIG_SYS_FSL_ERRATUM_DDR_A003
+ if (regs->ddr_sdram_rcw_2 & 0x00f00000) {
+ out_be32(&ddr->timing_cfg_2, regs->timing_cfg_2 & 0xf07fffff);
+ out_be32(&ddr->debug[2], 0x00000400);
+ out_be32(&ddr->ddr_zq_cntl, regs->ddr_zq_cntl & 0x7fffffff);
+ out_be32(&ddr->ddr_wrlvl_cntl, regs->ddr_wrlvl_cntl & 0x7fffffff);
+ out_be32(&ddr->sdram_cfg_2, regs->ddr_sdram_cfg_2 & 0xffffffeb);
+ out_be32(&ddr->mtcr, 0);
+ out_be32(&ddr->debug[12], 0x00000015);
+ out_be32(&ddr->debug[21], 0x24000000);
+ out_be32(&ddr->sdram_interval, regs->ddr_sdram_interval & 0xffff);
+ out_be32(&ddr->sdram_cfg, temp_sdram_cfg | SDRAM_CFG_BI | SDRAM_CFG_MEM_EN);
+
+ asm volatile("sync;isync");
+ while (!(in_be32(&ddr->debug[1]) & 0x2))
+ ;
+
+ switch (regs->ddr_sdram_rcw_2 & 0x00f00000) {
+ case 0x00000000:
+ out_be32(&ddr->sdram_md_cntl,
+ MD_CNTL_MD_EN |
+ MD_CNTL_CS_SEL_CS0_CS1 |
+ 0x04000000 |
+ MD_CNTL_WRCW |
+ MD_CNTL_MD_VALUE(0x02));
+ break;
+ case 0x00100000:
+ out_be32(&ddr->sdram_md_cntl,
+ MD_CNTL_MD_EN |
+ MD_CNTL_CS_SEL_CS0_CS1 |
+ 0x04000000 |
+ MD_CNTL_WRCW |
+ MD_CNTL_MD_VALUE(0x0a));
+ break;
+ case 0x00200000:
+ out_be32(&ddr->sdram_md_cntl,
+ MD_CNTL_MD_EN |
+ MD_CNTL_CS_SEL_CS0_CS1 |
+ 0x04000000 |
+ MD_CNTL_WRCW |
+ MD_CNTL_MD_VALUE(0x12));
+ break;
+ case 0x00300000:
+ out_be32(&ddr->sdram_md_cntl,
+ MD_CNTL_MD_EN |
+ MD_CNTL_CS_SEL_CS0_CS1 |
+ 0x04000000 |
+ MD_CNTL_WRCW |
+ MD_CNTL_MD_VALUE(0x1a));
+ break;
+ default:
+ out_be32(&ddr->sdram_md_cntl,
+ MD_CNTL_MD_EN |
+ MD_CNTL_CS_SEL_CS0_CS1 |
+ 0x04000000 |
+ MD_CNTL_WRCW |
+ MD_CNTL_MD_VALUE(0x02));
+ printf("Unsupported RC10\n");
+ break;
+ }
+
+ while (in_be32(&ddr->sdram_md_cntl) & 0x80000000)
+ ;
+ udelay(6);
+ out_be32(&ddr->sdram_cfg, temp_sdram_cfg);
+ out_be32(&ddr->timing_cfg_2, regs->timing_cfg_2);
+ out_be32(&ddr->debug[2], 0x0);
+ out_be32(&ddr->ddr_zq_cntl, regs->ddr_zq_cntl);
+ out_be32(&ddr->ddr_wrlvl_cntl, regs->ddr_wrlvl_cntl);
+ out_be32(&ddr->sdram_cfg_2, regs->ddr_sdram_cfg_2);
+ out_be32(&ddr->debug[12], 0x0);
+ out_be32(&ddr->debug[21], 0x0);
+ out_be32(&ddr->sdram_interval, regs->ddr_sdram_interval);
+
+ }
+#endif
/*
* For 8572 DDR1 erratum - DDR controller may enter illegal state
* when operatiing in 32-bit bus mode with 4-beat bursts,
@@ -120,8 +196,11 @@ void fsl_ddr_set_memctl_regs(const fsl_ddr_cfg_regs_t *regs,
asm volatile("sync;isync");
/* Let the controller go */
- temp_sdram_cfg = in_be32(&ddr->sdram_cfg);
+ temp_sdram_cfg = in_be32(&ddr->sdram_cfg) & ~SDRAM_CFG_BI;
out_be32(&ddr->sdram_cfg, temp_sdram_cfg | SDRAM_CFG_MEM_EN);
+ asm volatile("sync;isync");
+ while (!(in_be32(&ddr->debug[1]) & 0x2))
+ ;
/* Poll DDR_SDRAM_CFG_2[D_INIT] bit until auto-data init is done. */
while (in_be32(&ddr->sdram_cfg_2) & 0x10) {