[PATCH] fsl_ifc_nand: Added random output enable cmd

[Matt Weber]

This patch adds random output enable command support in IFC nand
controller driver. This command implements change read
column (05h-E0h).

Signed-off-by: Matthew Weber <matthew.weber at rockwellcollins.com>
Signed-off-by: Ronak Desai <ronak.desai at rockwellcollins.com>
---
 drivers/mtd/nand/fsl_ifc_nand.c | 30 +++++++++++++++++++++++++++---
 1 file changed, 27 insertions(+), 3 deletions(-)

diff --git a/drivers/mtd/nand/fsl_ifc_nand.c b/drivers/mtd/nand/fsl_ifc_nand.c
index 4e9e5fd..230919f 100644
--- a/drivers/mtd/nand/fsl_ifc_nand.c
+++ b/drivers/mtd/nand/fsl_ifc_nand.c
@@ -387,10 +387,11 @@ static void fsl_ifc_cmdfunc(struct mtd_info *mtd, unsigned int command,
 
 		/*
 		 * although currently it's 8 bytes for READID, we always read
-		 * the maximum 256 bytes(for PARAM)
+		 * the maximum 8192 bytes(for PARAM) supported by IFC controller
+		 * as extended page may be available for some NAND devices.
 		 */
-		ifc_out32(256, &ifc->ifc_nand.nand_fbcr);
-		ifc_nand_ctrl->read_bytes = 256;
+		ifc_out32(0, &ifc->ifc_nand.nand_fbcr); /* Read whole page */
+		ifc_nand_ctrl->read_bytes = 8192; /* Maximum supported page by IFC */
 
 		set_addr(mtd, 0, 0, 0);
 		fsl_ifc_run_command(mtd);
@@ -530,6 +531,29 @@ static void fsl_ifc_cmdfunc(struct mtd_info *mtd, unsigned int command,
 		fsl_ifc_run_command(mtd);
 		return;
 
+	case NAND_CMD_RNDOUT: {
+		__le16 Tccs = 0;
+		chip->onfi_version ? (Tccs = chip->onfi_params.t_ccs)
+					: (Tccs = chip->jedec_params.t_ccs);
+		ifc_out32((IFC_FIR_OP_CW0 << IFC_NAND_FIR0_OP0_SHIFT) |
+				(IFC_FIR_OP_CA0 << IFC_NAND_FIR0_OP1_SHIFT) |
+				(IFC_FIR_OP_CMD1 << IFC_NAND_FIR0_OP2_SHIFT) |
+				(IFC_FIR_OP_NWAIT << IFC_NAND_FIR0_OP3_SHIFT),
+				&ifc->ifc_nand.nand_fir0);
+
+		ifc_out32((NAND_CMD_RNDOUT << IFC_NAND_FCR0_CMD0_SHIFT) |
+				(NAND_CMD_RNDOUTSTART << IFC_NAND_FCR0_CMD1_SHIFT),
+				&ifc->ifc_nand.nand_fcr0);
+
+		/* Wait for minimum change column set-up time. But it does not harm
+		 * to wait more time, so calculated based on 333.3 MHz input IFC clock
+		 */
+		ifc_out32((0xFF & (le16_to_cpu(Tccs)/3)), &ifc->ifc_nand.ncfgr);
+		set_addr(mtd, column, 0, 0);
+		fsl_ifc_run_command(mtd);
+		return;
+	}
+
 	default:
 		dev_err(priv->dev, "%s: error, unsupported command 0x%x.\n",
 					__func__, command);
-- 
1.9.1