mpc85xx: Base emulator support
Prepare for emulator support for mpc85xx parts.
Disable DDR training and skip wrlvl_cntl_2 and wrlvl_cntl_3 registers.
These two registers improve stability but not supported by emulator.
Add CONFIG_FSL_TBCLK_EXTRA_DIV for possible adjustment to time base.
Signed-off-by: York Sun <yorksun@freescale.com>
diff --git a/README b/README
index a5c3e8d..5fb4c75 100644
--- a/README
+++ b/README
@@ -413,6 +413,10 @@
CONFIG_SYS_FSL_DSP_CCSRBAR_DEFAULT
This value denotes start offset of DSP CCSR space.
+ CONFIG_SYS_FSL_DDR_EMU
+ Specify emulator support for DDR. Some DDR features such as
+ deskew training are not available.
+
- Generic CPU options:
CONFIG_SYS_BIG_ENDIAN, CONFIG_SYS_LITTLE_ENDIAN
diff --git a/arch/powerpc/cpu/mpc85xx/cpu_init.c b/arch/powerpc/cpu/mpc85xx/cpu_init.c
index 25beda2..1774462 100644
--- a/arch/powerpc/cpu/mpc85xx/cpu_init.c
+++ b/arch/powerpc/cpu/mpc85xx/cpu_init.c
@@ -532,8 +532,10 @@
enable_cpc();
+#ifndef CONFIG_SYS_FSL_NO_SERDES
/* needs to be in ram since code uses global static vars */
fsl_serdes_init();
+#endif
#ifdef CONFIG_SYS_FSL_ERRATUM_A005871
if (IS_SVR_REV(svr, 1, 0)) {
diff --git a/arch/powerpc/cpu/mpc85xx/ddr-gen3.c b/arch/powerpc/cpu/mpc85xx/ddr-gen3.c
index c5b4720..3e7a564 100644
--- a/arch/powerpc/cpu/mpc85xx/ddr-gen3.c
+++ b/arch/powerpc/cpu/mpc85xx/ddr-gen3.c
@@ -123,10 +123,17 @@
out_be32(&ddr->timing_cfg_5, regs->timing_cfg_5);
out_be32(&ddr->ddr_zq_cntl, regs->ddr_zq_cntl);
out_be32(&ddr->ddr_wrlvl_cntl, regs->ddr_wrlvl_cntl);
+#ifndef CONFIG_SYS_FSL_DDR_EMU
+ /*
+ * Skip these two registers if running on emulator
+ * because emulator doesn't have skew between bytes.
+ */
+
if (regs->ddr_wrlvl_cntl_2)
out_be32(&ddr->ddr_wrlvl_cntl_2, regs->ddr_wrlvl_cntl_2);
if (regs->ddr_wrlvl_cntl_3)
out_be32(&ddr->ddr_wrlvl_cntl_3, regs->ddr_wrlvl_cntl_3);
+#endif
out_be32(&ddr->ddr_sr_cntr, regs->ddr_sr_cntr);
out_be32(&ddr->ddr_sdram_rcw_1, regs->ddr_sdram_rcw_1);
diff --git a/arch/powerpc/cpu/mpc85xx/fdt.c b/arch/powerpc/cpu/mpc85xx/fdt.c
index cfaa2ed..84bb8fa 100644
--- a/arch/powerpc/cpu/mpc85xx/fdt.c
+++ b/arch/powerpc/cpu/mpc85xx/fdt.c
@@ -604,8 +604,12 @@
fdt_add_enet_stashing(blob);
+#ifndef CONFIG_FSL_TBCLK_EXTRA_DIV
+#define CONFIG_FSL_TBCLK_EXTRA_DIV 1
+#endif
do_fixup_by_prop_u32(blob, "device_type", "cpu", 4,
- "timebase-frequency", get_tbclk(), 1);
+ "timebase-frequency", get_tbclk() / CONFIG_FSL_TBCLK_EXTRA_DIV,
+ 1);
do_fixup_by_prop_u32(blob, "device_type", "cpu", 4,
"bus-frequency", bd->bi_busfreq, 1);
get_sys_info(&sysinfo);
diff --git a/arch/powerpc/cpu/mpc8xxx/ddr/ctrl_regs.c b/arch/powerpc/cpu/mpc8xxx/ddr/ctrl_regs.c
index ff5812d..0f73e9c 100644
--- a/arch/powerpc/cpu/mpc8xxx/ddr/ctrl_regs.c
+++ b/arch/powerpc/cpu/mpc8xxx/ddr/ctrl_regs.c
@@ -1638,5 +1638,10 @@
set_ddr_sdram_rcw(ddr, popts, common_dimm);
+#ifdef CONFIG_SYS_FSL_DDR_EMU
+ /* disble DDR training for emulator */
+ ddr->debug[2] = 0x00000400;
+ ddr->debug[4] = 0xff800000;
+#endif
return check_fsl_memctl_config_regs(ddr);
}