Chromium: arm: tegra: Add NAND support

include/configs/chromeos/tegra2/seaboard/parts/nand.h

+/*
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+ */
+/* Set clock divisor
+ * 7 bits of D and 1 bit of H
+ * divisor= (DDDDDDD + 1) + (H x 0.5)
+ * clock = original clock / divisor
+ * 6 means /4  */
+#define CONFIG_NAND_CLK_DIVISOR_DDDDDDDH        6
+
+#ifdef CONFIG_TEGRA2_NAND_HYNIX_HY27UF4G2B
+/* For HYNIX HY27UF4G2B
+ * Frequence output of PLLP_OUT0 is set by BOOTROM to 216MHz
+ * to CLK_RST_CONTROLLER_PLLP_BASE_0,
+ * 216MHz / divisor 4 = 54MHZ
+ * 1 clock = 18.5 ns = NAND_CLK_PERIOD
+ * TRP_RESP_CNT=n, max(tRP, tREA)= max(12ns, 20ns)= 20ns for non-EDO mode
+ *   bit 31-28=n=1, generated timing= (n+1) * NAND_CLK_PERIOD= (1+1)* 18.5
+ * TWB_CNT bit 27-24=n, tWB = 100ns = (n+1)* 18.5, so n= 5 (bit 27-24)
+ * similar way for other fields, please refer to reference manual
+ */
+/* Value to be set to NAND_TIMING_0 register, address=70008014h */
+#define CONFIG_TEGRA2_NAND_TIMING       0x15040001
+/* Value to be set to NAND_TIMING2_0 register, address=7000801Ch */
+#define CONFIG_TEGRA2_NAND_TIMING2      0x01
+#endif