powerpc/mpc8xxx: Allow override DDR read-to-write turnaround time

Add this option to allow boards to override the default read-to-write
turnaround time for better performance.
Signed-off-by: NYork Sun <yorksun@freescale.com>

arch/powerpc/cpu/mpc8xxx/ddr/ctrl_regs.c

@@ -267,6 +267,9 @@ static void set_timing_cfg_0(fsl_ddr_cfg_regs_t *ddr,
 	tmrd_mclk = 2;
 #endif
 
+	if (popts->trwt_override)
+		trwt_mclk = popts->trwt;
+
 	ddr->timing_cfg_0 = (0
 		| ((trwt_mclk & 0x3) << 30)	/* RWT */
 		| ((twrt_mclk & 0x3) << 28)	/* WRT */

arch/powerpc/include/asm/fsl_ddr_sdram.h

@@ -271,6 +271,9 @@ typedef struct memctl_options_s {
 	unsigned int rcw_2;
 	/* control register 1 */
 	unsigned int ddr_cdr1;
+
+	unsigned int trwt_override;
+	unsigned int trwt;			/* read-to-write turnaround */
 } memctl_options_t;
 
 extern phys_size_t fsl_ddr_sdram(void);