fsl-lsch3: soc: Enable AHB read support for Flexspi controller

Enable AHB support for Flexspi controller interface meaning
memory can be accessed via md command using absolute addresses

Signed-off-by: Yogesh Gaur <yogeshnarayan.gaur@nxp.com>
Signed-off-by: Ashish Kumar <Ashish.Kumar@nxp.com>
Signed-off-by: Rajat Srivastava <rajat.srivastava@nxp.com>
Signed-off-by: Kuldeep Singh <kuldeep.singh@nxp.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
diff --git a/arch/arm/cpu/armv8/fsl-layerscape/soc.c b/arch/arm/cpu/armv8/fsl-layerscape/soc.c
index 4b193c6..578f8d1 100644
--- a/arch/arm/cpu/armv8/fsl-layerscape/soc.c
+++ b/arch/arm/cpu/armv8/fsl-layerscape/soc.c
@@ -686,6 +686,47 @@
 }
 #endif
 
+#ifdef CONFIG_FSPI_AHB_EN_4BYTE
+int fspi_ahb_init(void)
+{
+	/* Enable 4bytes address support and fast read */
+	u32 *fspi_lut, lut_key, *fspi_key;
+
+	fspi_key = (void *)SYS_NXP_FSPI_ADDR + SYS_NXP_FSPI_LUTKEY_BASE_ADDR;
+	fspi_lut = (void *)SYS_NXP_FSPI_ADDR + SYS_NXP_FSPI_LUT_BASE_ADDR;
+
+	lut_key = in_be32(fspi_key);
+
+	if (lut_key == SYS_NXP_FSPI_LUTKEY) {
+		/* That means the register is BE */
+		out_be32(fspi_key, SYS_NXP_FSPI_LUTKEY);
+		/* Unlock the lut table */
+		out_be32(fspi_key + 1, SYS_NXP_FSPI_LUTCR_UNLOCK);
+		/* Create READ LUT */
+		out_be32(fspi_lut, 0x0820040c);
+		out_be32(fspi_lut + 1, 0x24003008);
+		out_be32(fspi_lut + 2, 0x00000000);
+		/* Lock the lut table */
+		out_be32(fspi_key, SYS_NXP_FSPI_LUTKEY);
+		out_be32(fspi_key + 1, SYS_NXP_FSPI_LUTCR_LOCK);
+	} else {
+		/* That means the register is LE */
+		out_le32(fspi_key, SYS_NXP_FSPI_LUTKEY);
+		/* Unlock the lut table */
+		out_le32(fspi_key + 1, SYS_NXP_FSPI_LUTCR_UNLOCK);
+		/* Create READ LUT */
+		out_le32(fspi_lut, 0x0820040c);
+		out_le32(fspi_lut + 1, 0x24003008);
+		out_le32(fspi_lut + 2, 0x00000000);
+		/* Lock the lut table */
+		out_le32(fspi_key, SYS_NXP_FSPI_LUTKEY);
+		out_le32(fspi_key + 1, SYS_NXP_FSPI_LUTCR_LOCK);
+	}
+
+	return 0;
+}
+#endif
+
 #ifdef CONFIG_QSPI_AHB_INIT
 /* Enable 4bytes address support and fast read */
 int qspi_ahb_init(void)
@@ -878,6 +919,9 @@
 #ifdef CONFIG_QSPI_AHB_INIT
 	qspi_ahb_init();
 #endif
+#ifdef CONFIG_FSPI_AHB_EN_4BYTE
+	fspi_ahb_init();
+#endif
 
 	return fsl_board_late_init();
 }