[U-Boot] [Patch v3 4/6] powerpc/mpc8xxx: Extend DDR registers' fields

[York Sun]

Some DDR registers' fields have expanded to accommodate larger values.
These changes are backward compatible. Some fields are removed for newer
DDR controllers. Writing to those fields are safely ignored.

TIMING_CFG_2 register is fixed. Additive latency is added to RD_TO_PRE
automatically. It was a misunderstanding in commit c360ceac.

Signed-off-by: York Sun <yorksun at freescale.com>
---
Change log
 v3: no change
 v2: no change since v1

 drivers/ddr/fsl/ctrl_regs.c |   20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/drivers/ddr/fsl/ctrl_regs.c b/drivers/ddr/fsl/ctrl_regs.c
index 5f3ea59..6bf22cf 100644
--- a/drivers/ddr/fsl/ctrl_regs.c
+++ b/drivers/ddr/fsl/ctrl_regs.c
@@ -325,10 +325,10 @@ static void set_timing_cfg_0(fsl_ddr_cfg_regs_t *ddr,
 		| ((twrt_mclk & 0x3) << 28)	/* WRT */
 		| ((trrt_mclk & 0x3) << 26)	/* RRT */
 		| ((twwt_mclk & 0x3) << 24)	/* WWT */
-		| ((act_pd_exit_mclk & 0x7) << 20)  /* ACT_PD_EXIT */
+		| ((act_pd_exit_mclk & 0xf) << 20)  /* ACT_PD_EXIT */
 		| ((pre_pd_exit_mclk & 0xF) << 16)  /* PRE_PD_EXIT */
 		| ((taxpd_mclk & 0xf) << 8)	/* ODT_PD_EXIT */
-		| ((tmrd_mclk & 0xf) << 0)	/* MRS_CYC */
+		| ((tmrd_mclk & 0x1f) << 0)	/* MRS_CYC */
 		);
 	debug("FSLDDR: timing_cfg_0 = 0x%08x\n", ddr->timing_cfg_0);
 }
@@ -338,7 +338,8 @@ static void set_timing_cfg_0(fsl_ddr_cfg_regs_t *ddr,
 static void set_timing_cfg_3(fsl_ddr_cfg_regs_t *ddr,
 			       const memctl_options_t *popts,
 			       const common_timing_params_t *common_dimm,
-			       unsigned int cas_latency)
+			       unsigned int cas_latency,
+			       unsigned int additive_latency)
 {
 	/* Extended precharge to activate interval (tRP) */
 	unsigned int ext_pretoact = 0;
@@ -350,6 +351,8 @@ static void set_timing_cfg_3(fsl_ddr_cfg_regs_t *ddr,
 	unsigned int ext_refrec;
 	/* Extended MCAS latency from READ cmd */
 	unsigned int ext_caslat = 0;
+	/* Extended additive latency */
+	unsigned int ext_add_lat = 0;
 	/* Extended last data to precharge interval (tWR) */
 	unsigned int ext_wrrec = 0;
 	/* Control Adjust */
@@ -359,6 +362,7 @@ static void set_timing_cfg_3(fsl_ddr_cfg_regs_t *ddr,
 	ext_acttopre = picos_to_mclk(common_dimm->tras_ps) >> 4;
 	ext_acttorw = picos_to_mclk(common_dimm->trcd_ps) >> 4;
 	ext_caslat = (2 * cas_latency - 1) >> 4;
+	ext_add_lat = additive_latency >> 4;
 	ext_refrec = (picos_to_mclk(common_dimm->trfc_ps) - 8) >> 4;
 	/* ext_wrrec only deals with 16 clock and above, or 14 with OTF */
 	ext_wrrec = (picos_to_mclk(common_dimm->twr_ps) +
@@ -370,6 +374,7 @@ static void set_timing_cfg_3(fsl_ddr_cfg_regs_t *ddr,
 		| ((ext_acttorw & 0x1) << 22)
 		| ((ext_refrec & 0x1F) << 16)
 		| ((ext_caslat & 0x3) << 12)
+		| ((ext_add_lat & 0x1) << 10)
 		| ((ext_wrrec & 0x1) << 8)
 		| ((cntl_adj & 0x7) << 0)
 		);
@@ -531,8 +536,6 @@ static void set_timing_cfg_2(fsl_ddr_cfg_regs_t *ddr,
 	if (rd_to_pre < 4)
 		rd_to_pre = 4;
 #endif
-	if (additive_latency)
-		rd_to_pre += additive_latency;
 	if (popts->otf_burst_chop_en)
 		rd_to_pre += 2; /* according to UM */
 
@@ -1592,8 +1595,8 @@ compute_fsl_memctl_config_regs(const memctl_options_t *popts,
 
 		if (cs_en) {
 			ddr->cs[i].bnds = (0
-				| ((sa & 0xFFF) << 16)/* starting address MSB */
-				| ((ea & 0xFFF) << 0)	/* ending address MSB */
+				| ((sa & 0xffff) << 16) /* starting address */
+				| ((ea & 0xffff) << 0)	/* ending address */
 				);
 		} else {
 			/* setting bnds to 0xffffffff for inactive CS */
@@ -1618,7 +1621,8 @@ compute_fsl_memctl_config_regs(const memctl_options_t *popts,
 	set_timing_cfg_0(ddr, popts, dimm_params);
 #endif
 
-	set_timing_cfg_3(ddr, popts, common_dimm, cas_latency);
+	set_timing_cfg_3(ddr, popts, common_dimm, cas_latency,
+			 additive_latency);
 	set_timing_cfg_1(ddr, popts, common_dimm, cas_latency);
 	set_timing_cfg_2(ddr, popts, common_dimm,
 				cas_latency, additive_latency);
-- 
1.7.9.5