Add ddr interleaving suppport for MPC8572DS board

* Add board specific parameter table to choose correct cpo, clk_adjust,
write_data_delay, 2T based on board ddr frequency and n_ranks.

* Set odt_rd_cfg and odt_wr_cfg based on the dimm# and CS#.

* Set memory controller interleaving mode to bank interleaving, and disable
bank(chip select) interleaving mode by default, because the default on-board
DDR DIMMs are 2x512MB single-rank.

* Change CONFIG_ICS307_REFCLK_HZ from 33333333 to 33333000.

Signed-off-by: James Yang <James.Yang@freescale.com>
Signed-off-by: Haiying Wang <Haiying.Wang@freescale.com>

board/freescale/mpc8572ds/ddr.c

@@ -39,42 +39,108 @@ void fsl_ddr_get_spd(ddr2_spd_eeprom_t *ctrl_dimms_spd,
 	}
 }
 
+typedef struct {
+	u32 datarate_mhz_low;
+	u32 datarate_mhz_high;
+	u32 n_ranks;
+	u32 clk_adjust;
+	u32 cpo;
+	u32 write_data_delay;
+	u32 force_2T;
+} board_specific_parameters_t;
+
+/* ranges for parameters:
+ *  wr_data_delay = 0-6
+ *  clk adjust = 0-8
+ *  cpo 2-0x1E (30)
+ */
+
+
+/* XXX: these values need to be checked for all interleaving modes.  */
+/* XXX: No reliable dual-rank 800 MHz setting has been found.  It may
+ *      seem reliable, but errors will appear when memory intensive
+ *      program is run. */
+/* XXX: Single rank at 800 MHz is OK.  */
+const board_specific_parameters_t board_specific_parameters[][20] = {
+	{
+	/* 	memory controller 0 			*/
+	/*	  lo|  hi|  num|  clk| cpo|wrdata|2T	*/
+	/*	 mhz| mhz|ranks|adjst|    | delay|	*/
+		{  0, 333,    2,    6,   7,    3,  0},
+		{334, 400,    2,    6,   9,    3,  0},
+		{401, 549,    2,    6,  11,    3,  0},
+		{550, 680,    2,    1,  10,    5,  0},
+		{681, 850,    2,    1,  12,    5,  1},
+		{  0, 333,    1,    6,   7,    3,  0},
+		{334, 400,    1,    6,   9,    3,  0},
+		{401, 549,    1,    6,  11,    3,  0},
+		{550, 680,    1,    1,  10,    5,  0},
+		{681, 850,    1,    1,  12,    5,  0}
+	},
+
+	{
+	/*	memory controller 1			*/
+	/*	  lo|  hi|  num|  clk| cpo|wrdata|2T	*/
+	/*	 mhz| mhz|ranks|adjst|    | delay|	*/
+		{  0, 333,    2,     6,  7,    3,  0},
+		{334, 400,    2,     6,  9,    3,  0},
+		{401, 549,    2,     6, 11,    3,  0},
+		{550, 680,    2,     1, 11,    6,  0},
+		{681, 850,    2,     1, 13,    6,  1},
+		{  0, 333,    1,     6,  7,    3,  0},
+		{334, 400,    1,     6,  9,    3,  0},
+		{401, 549,    1,     6, 11,    3,  0},
+		{550, 680,    1,     1, 11,    6,  0},
+		{681, 850,    1,     1, 13,    6,  0}
+	}
+};
+
 void fsl_ddr_board_options(memctl_options_t *popts,
 				dimm_params_t *pdimm,
 				unsigned int ctrl_num)
 {
-	/*
-	 * Factors to consider for clock adjust:
-	 *	- number of chips on bus
-	 *	- position of slot
-	 *	- DDR1 vs. DDR2?
-	 *	- ???
-	 *
-	 * This needs to be determined on a board-by-board basis.
-	 *	0110	3/4 cycle late
-	 *	0111	7/8 cycle late
-	 */
-	popts->clk_adjust = 7;
+	const board_specific_parameters_t *pbsp =
+				&(board_specific_parameters[ctrl_num][0]);
+	u32 num_params = sizeof(board_specific_parameters[ctrl_num]) /
+				sizeof(board_specific_parameters[0][0]);
+	u32 i;
+	ulong ddr_freq;
 
-	/*
-	 * Factors to consider for CPO:
-	 *	- frequency
-	 *	- ddr1 vs. ddr2
+	/* set odt_rd_cfg and odt_wr_cfg. If the there is only one dimm in
+	 * that controller, set odt_wr_cfg to 4 for CS0, and 0 to CS1. If
+	 * there are two dimms in the controller, set odt_rd_cfg to 3 and
+	 * odt_wr_cfg to 3 for the even CS, 0 for the odd CS.
 	 */
-	popts->cpo_override = 10;
+	for (i = 0; i < CONFIG_CHIP_SELECTS_PER_CTRL; i++) {
+		if (i&1) {	/* odd CS */
+			popts->cs_local_opts[i].odt_rd_cfg = 0;
+			popts->cs_local_opts[i].odt_wr_cfg = 0;
+		} else {	/* even CS */
+			if (CONFIG_DIMM_SLOTS_PER_CTLR == 1) {
+				popts->cs_local_opts[i].odt_rd_cfg = 0;
+				popts->cs_local_opts[i].odt_wr_cfg = 4;
+			} else if (CONFIG_DIMM_SLOTS_PER_CTLR == 2) {
+			popts->cs_local_opts[i].odt_rd_cfg = 3;
+			popts->cs_local_opts[i].odt_wr_cfg = 3;
+			}
+		}
+	}
 
-	/*
-	 * Factors to consider for write data delay:
-	 *	- number of DIMMs
-	 *
-	 * 1 = 1/4 clock delay
-	 * 2 = 1/2 clock delay
-	 * 3 = 3/4 clock delay
-	 * 4 = 1   clock delay
-	 * 5 = 5/4 clock delay
-	 * 6 = 3/2 clock delay
+	/* Get clk_adjust, cpo, write_data_delay,2T, according to the board ddr
+	 * freqency and n_banks specified in board_specific_parameters table.
 	 */
-	popts->write_data_delay = 5;
+	ddr_freq = get_ddr_freq(0) / 1000000;
+	for (i = 0; i < num_params; i++) {
+		if (ddr_freq >= pbsp->datarate_mhz_low &&
+		    ddr_freq <= pbsp->datarate_mhz_high &&
+		    pdimm->n_ranks == pbsp->n_ranks) {
+			popts->clk_adjust = pbsp->clk_adjust;
+			popts->cpo_override = pbsp->cpo;
+			popts->write_data_delay = pbsp->write_data_delay;
+			popts->twoT_en = pbsp->force_2T;
+		}
+		pbsp++;
+	}
 
 	/*
 	 * Factors to consider for half-strength driver enable:

include/configs/MPC8572DS.h

@@ -61,7 +61,7 @@ extern unsigned long get_board_ddr_clk(unsigned long dummy);
 #endif
 #define CONFIG_SYS_CLK_FREQ	get_board_sys_clk(0) /* sysclk for MPC85xx */
 #define CONFIG_DDR_CLK_FREQ	get_board_ddr_clk(0) /* ddrclk for MPC85xx */
-#define CONFIG_ICS307_REFCLK_HZ	33333333  /* ICS307 clock chip ref freq */
+#define CONFIG_ICS307_REFCLK_HZ	33333000  /* ICS307 clock chip ref freq */
 #define CONFIG_GET_CLK_FROM_ICS307	  /* decode sysclk and ddrclk freq
 					     from ICS307 instead of switches */
 
@@ -549,6 +549,7 @@ extern unsigned long get_board_ddr_clk(unsigned long dummy);
 #define CONFIG_BAUDRATE	115200
 
 #define	CONFIG_EXTRA_ENV_SETTINGS				\
+ "memctl_intlv_ctl=2\0"						\
  "netdev=eth0\0"						\
  "uboot=" MK_STR(CONFIG_UBOOTPATH) "\0"				\
  "tftpflash=tftpboot $loadaddr $uboot; "			\