ppc4xx: DDR2: Complete RDSS configuration on non-SPD based boards

As described in item #10 of the SDRAM initialization (chapter 22.2.9
of the PPC460EX/EXr/GT users manual), RDSS may need to be adjusted. The
code for this is now factored out and executed for non-SPD based boards
as well.

Signed-off-by: Stefan Roese <sr@denx.de>

diff --git a/arch/powerpc/cpu/ppc4xx/44x_spd_ddr2.c b/arch/powerpc/cpu/ppc4xx/44x_spd_ddr2.c
index faddee98b781df101c16d1614ec713d003e6d12b..b2cc2feaa3034f7072a324adea9373670878c890 100644 (file)
--- a/arch/powerpc/cpu/ppc4xx/44x_spd_ddr2.c
+++ b/arch/powerpc/cpu/ppc4xx/44x_spd_ddr2.c
@@ -68,6 +68,31 @@
                       "SDRAM_" #mnemonic, SDRAM_##mnemonic, data);     \
        } while (0)
 
+#if !defined(CONFIG_NAND_U_BOOT) || defined(CONFIG_NAND_SPL)
+static void update_rdcc(void)
+{
+       u32 val;
+
+       /*
+        * Complete RDSS configuration as mentioned on page 7 of the AMCC
+        * PowerPC440SP/SPe DDR2 application note:
+        * "DDR1/DDR2 Initialization Sequence and Dynamic Tuning"
+        *
+        * Or item #10 "10. Complete RDSS configuration" in chapter
+        * "22.2.9 SDRAM Initialization" of AMCC PPC460EX/EXr/GT users
+        * manual.
+        */
+       mfsdram(SDRAM_RTSR, val);
+       if ((val & SDRAM_RTSR_TRK1SM_MASK) == SDRAM_RTSR_TRK1SM_ATPLS1) {
+               mfsdram(SDRAM_RDCC, val);
+               if ((val & SDRAM_RDCC_RDSS_MASK) != SDRAM_RDCC_RDSS_T4) {
+                       val += 0x40000000;
+                       mtsdram(SDRAM_RDCC, val);
+               }
+       }
+}
+#endif
+
 #if defined(CONFIG_440)
 /*
  * This DDR2 setup code can dynamically setup the TLB entries for the DDR2
@@ -620,6 +645,12 @@ phys_size_t initdram(int board_type)
 #else
        program_DQS_calibration(dimm_populated, iic0_dimm_addr, num_dimm_banks);
 #endif
+       /*
+        * Now complete RDSS configuration as mentioned on page 7 of the AMCC
+        * PowerPC440SP/SPe DDR2 application note:
+        * "DDR1/DDR2 Initialization Sequence and Dynamic Tuning"
+        */
+       update_rdcc();
 
 #ifdef CONFIG_DDR_ECC
        /*------------------------------------------------------------------
@@ -2692,20 +2723,6 @@ calibration_loop:
        blank_string(strlen(str));
 #endif /* CONFIG_DDR_RQDC_FIXED */
 
-       /*
-        * Now complete RDSS configuration as mentioned on page 7 of the AMCC
-        * PowerPC440SP/SPe DDR2 application note:
-        * "DDR1/DDR2 Initialization Sequence and Dynamic Tuning"
-        */
-       mfsdram(SDRAM_RTSR, val);
-       if ((val & SDRAM_RTSR_TRK1SM_MASK) == SDRAM_RTSR_TRK1SM_ATPLS1) {
-               mfsdram(SDRAM_RDCC, val);
-               if ((val & SDRAM_RDCC_RDSS_MASK) != SDRAM_RDCC_RDSS_T4) {
-                       val += 0x40000000;
-                       mtsdram(SDRAM_RDCC, val);
-               }
-       }
-
        mfsdram(SDRAM_DLCR, val);
        debug("%s[%d] DLCR: 0x%08lX\n", __FUNCTION__, __LINE__, val);
        mfsdram(SDRAM_RQDC, val);
@@ -3007,6 +3024,13 @@ phys_size_t initdram(int board_type)
 #endif /* !defined(CONFIG_NAND_U_BOOT) && !defined(CONFIG_NAND_SPL) */
 #endif /* CONFIG_PPC4xx_DDR_AUTOCALIBRATION */
 
+       /*
+        * Now complete RDSS configuration as mentioned on page 7 of the AMCC
+        * PowerPC440SP/SPe DDR2 application note:
+        * "DDR1/DDR2 Initialization Sequence and Dynamic Tuning"
+        */
+       update_rdcc();
+
 #if defined(CONFIG_DDR_ECC)
        do_program_ecc(0);
 #endif /* defined(CONFIG_DDR_ECC) */