arm: mxs: olinuxino: Fine-tune DRAM configuration

Add fine-tuning for the DRAM configuration according to the DRAM chip
datasheet. THis configuration applies to both Hynix HY5DU12622DTP and
Samsung K5H511538J-D43 .

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Stefano Babic <sbabic@denx.de>

board/olimex/mx23_olinuxino/mx23_olinuxino.c

@@ -78,3 +78,33 @@ int board_init(void)
 
 	return 0;
 }
+
+/* Fine-tune the DRAM configuration. */
+void mxs_adjust_memory_params(uint32_t *dram_vals)
+{
+	/* Enable Auto Precharge. */
+	dram_vals[3] |= 1 << 8;
+	/* Enable Fast Writes. */
+	dram_vals[5] |= 1 << 8;
+	/* tEMRS = 3*tCK */
+	dram_vals[10] &= ~(0x3 << 8);
+	dram_vals[10] |= (0x3 << 8);
+	/* CASLAT = 3*tCK */
+	dram_vals[11] &= ~(0x3 << 0);
+	dram_vals[11] |= (0x3 << 0);
+	/* tCKE = 1*tCK */
+	dram_vals[12] &= ~(0x7 << 0);
+	dram_vals[12] |= (0x1 << 0);
+	/* CASLAT_LIN_GATE = 3*tCK , CASLAT_LIN = 3*tCK, tWTR=2*tCK */
+	dram_vals[13] &= ~((0xf << 16) | (0xf << 24) | (0xf << 0));
+	dram_vals[13] |= (0x6 << 16) | (0x6 << 24) | (0x2 << 0);
+	/* tDAL = 6*tCK */
+	dram_vals[15] &= ~(0xf << 16);
+	dram_vals[15] |= (0x6 << 16);
+	/* tREF = 1040*tCK */
+	dram_vals[26] &= ~0xffff;
+	dram_vals[26] |= 0x0410;
+	/* tRAS_MAX = 9334*tCK */
+	dram_vals[32] &= ~0xffff;
+	dram_vals[32] |= 0x2475;
+}