powerpc/mpc8548: Add workaround for erratum NMG_DDR120
Erratum NMG_DDR120 (DDR19 in MPC8548 errata document) applies to some
early version silicons. The default settings of the DDR IO receiver
biasing may not work at cold temperature. When a failure occurs,
a DDR input latches an incorrect value. The workaround will set the
receiver to an acceptable bias point.
Signed-off-by: Gong Chen
Signed-off-by: Zhao Chenhui <chenhui.zhao@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/arch/powerpc/cpu/mpc85xx/cmd_errata.c b/arch/powerpc/cpu/mpc85xx/cmd_errata.c
index 0478ec1..f0fa0f5 100644
--- a/arch/powerpc/cpu/mpc85xx/cmd_errata.c
+++ b/arch/powerpc/cpu/mpc85xx/cmd_errata.c
@@ -96,6 +96,10 @@
#ifdef CONFIG_SYS_FSL_ERRATUM_IFC_A003399
puts("Work-around for Erratum IFC A-003399 enabled\n");
#endif
+#ifdef CONFIG_SYS_FSL_ERRATUM_NMG_DDR120
+ if ((SVR_MAJ(svr) == 1) || IS_SVR_REV(svr, 2, 0))
+ puts("Work-around for Erratum NMG DDR120 enabled\n");
+#endif
return 0;
}
diff --git a/arch/powerpc/cpu/mpc85xx/ddr-gen2.c b/arch/powerpc/cpu/mpc85xx/ddr-gen2.c
index 10f3685..49000a1 100644
--- a/arch/powerpc/cpu/mpc85xx/ddr-gen2.c
+++ b/arch/powerpc/cpu/mpc85xx/ddr-gen2.c
@@ -8,6 +8,7 @@
#include <common.h>
#include <asm/io.h>
+#include <asm/processor.h>
#include <asm/fsl_ddr_sdram.h>
#if (CONFIG_CHIP_SELECTS_PER_CTRL > 4)
@@ -22,12 +23,31 @@
ccsr_ddr_t *ddr = (void *)CONFIG_SYS_MPC83xx_DDR_ADDR;
#else
ccsr_ddr_t *ddr = (void *)CONFIG_SYS_MPC85xx_DDR_ADDR;
+#ifdef CONFIG_SYS_FSL_ERRATUM_NMG_DDR120
+ ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
+ uint svr;
+#endif
#endif
if (ctrl_num) {
printf("%s unexpected ctrl_num = %u\n", __FUNCTION__, ctrl_num);
return;
}
+
+#ifdef CONFIG_SYS_FSL_ERRATUM_NMG_DDR120
+ /*
+ * Set the DDR IO receiver to an acceptable bias point.
+ * Fixed in Rev 2.1.
+ */
+ svr = get_svr();
+ if ((SVR_MAJ(svr) == 1) || IS_SVR_REV(svr, 2, 0)) {
+ if ((regs->ddr_sdram_cfg & SDRAM_CFG_SDRAM_TYPE_MASK) ==
+ SDRAM_CFG_SDRAM_TYPE_DDR2)
+ out_be32(&gur->ddrioovcr, 0x90000000);
+ else
+ out_be32(&gur->ddrioovcr, 0xA8000000);
+ }
+#endif
for (i = 0; i < CONFIG_CHIP_SELECTS_PER_CTRL; i++) {
if (i == 0) {