[U-Boot] [PATCH 03/11] mpc85xx: Base emulator support

[York Sun]

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 at freescale.com>
---
 README                                   |    5 +++++
 arch/powerpc/cpu/mpc85xx/cpu_init.c      |    2 ++
 arch/powerpc/cpu/mpc85xx/ddr-gen3.c      |    7 +++++++
 arch/powerpc/cpu/mpc85xx/fdt.c           |    6 +++++-
 arch/powerpc/cpu/mpc8xxx/ddr/ctrl_regs.c |    5 +++++
 5 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/README b/README
index cd0336c..353d016 100644
--- a/README
+++ b/README
@@ -418,6 +418,11 @@ The following options need to be configured:
 		This is the value to write into CCSR offset 0x18600
 		according to the A004510 workaround.
 
+		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 4067f05..fd19d99 100644
--- a/arch/powerpc/cpu/mpc85xx/cpu_init.c
+++ b/arch/powerpc/cpu/mpc85xx/cpu_init.c
@@ -545,8 +545,10 @@ skip_l2:
 
 	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 @@ void fsl_ddr_set_memctl_regs(const fsl_ddr_cfg_regs_t *regs,
 	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 288f7b2..8072235 100644
--- a/arch/powerpc/cpu/mpc85xx/fdt.c
+++ b/arch/powerpc/cpu/mpc85xx/fdt.c
@@ -620,8 +620,12 @@ void ft_cpu_setup(void *blob, bd_t *bd)
 
 	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 26c42f7..8c95cad 100644
--- a/arch/powerpc/cpu/mpc8xxx/ddr/ctrl_regs.c
+++ b/arch/powerpc/cpu/mpc8xxx/ddr/ctrl_regs.c
@@ -1641,5 +1641,10 @@ compute_fsl_memctl_config_regs(const memctl_options_t *popts,
 
 	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);
 }
-- 
1.7.9.5