mtd: gpmi: add a new field for HW_GPMI_CTRL1

add the WRN_DLY_SEL field for HW_GPMI_CTRL1.
This field is used as delay for gpmi write strobe.

Signed-off-by: Huang Shijie <b32955@freescale.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

drivers/mtd/nand/gpmi-nand/gpmi-lib.c

@@ -731,6 +731,7 @@ static int gpmi_nfc_compute_hardware_timing(struct gpmi_nand_data *this,
 	hw->use_half_periods        = dll_use_half_periods;
 	hw->sample_delay_factor     = sample_delay_factor;
 	hw->device_busy_timeout     = GPMI_DEFAULT_BUSY_TIMEOUT;
+	hw->wrn_dly_sel             = BV_GPMI_CTRL1_WRN_DLY_SEL_4_TO_8NS;
 
 	/* Return success. */
 	return 0;
@@ -769,6 +770,11 @@ void gpmi_begin(struct gpmi_nand_data *this)
 
 	/* [3] The following code is to set the HW_GPMI_CTRL1. */
 
+	/* Set the WRN_DLY_SEL */
+	writel(BM_GPMI_CTRL1_WRN_DLY_SEL, gpmi_regs + HW_GPMI_CTRL1_CLR);
+	writel(BF_GPMI_CTRL1_WRN_DLY_SEL(hw.wrn_dly_sel),
+					gpmi_regs + HW_GPMI_CTRL1_SET);
+
 	/* DLL_ENABLE must be set to 0 when setting RDN_DELAY or HALF_PERIOD. */
 	writel(BM_GPMI_CTRL1_DLL_ENABLE, gpmi_regs + HW_GPMI_CTRL1_CLR);
 

drivers/mtd/nand/gpmi-nand/gpmi-nand.h

@@ -195,6 +195,7 @@ struct gpmi_nand_data {
  * @use_half_periods:          Indicates the clock is running slowly, so the
  *                             NFC DLL should use half-periods.
  * @sample_delay_factor:       The sample delay factor.
+ * @wrn_dly_sel:               The delay on the GPMI write strobe.
  */
 struct gpmi_nfc_hardware_timing {
 	/* for HW_GPMI_TIMING0 */
@@ -209,6 +210,7 @@ struct gpmi_nfc_hardware_timing {
 	/* for HW_GPMI_CTRL1 */
 	bool     use_half_periods;
 	uint8_t  sample_delay_factor;
+	uint8_t  wrn_dly_sel;
 };
 
 /**

drivers/mtd/nand/gpmi-nand/gpmi-regs.h

@@ -108,6 +108,15 @@
 #define HW_GPMI_CTRL1_CLR				0x00000068
 #define HW_GPMI_CTRL1_TOG				0x0000006c
 
+#define BP_GPMI_CTRL1_WRN_DLY_SEL			22
+#define BM_GPMI_CTRL1_WRN_DLY_SEL	(0x3 << BP_GPMI_CTRL1_WRN_DLY_SEL)
+#define BF_GPMI_CTRL1_WRN_DLY_SEL(v)  \
+	(((v) << BP_GPMI_CTRL1_WRN_DLY_SEL) & BM_GPMI_CTRL1_WRN_DLY_SEL)
+#define BV_GPMI_CTRL1_WRN_DLY_SEL_4_TO_8NS		0x0
+#define BV_GPMI_CTRL1_WRN_DLY_SEL_6_TO_10NS		0x1
+#define BV_GPMI_CTRL1_WRN_DLY_SEL_7_TO_12NS		0x2
+#define BV_GPMI_CTRL1_WRN_DLY_SEL_NO_DELAY		0x3
+
 #define BM_GPMI_CTRL1_BCH_MODE				(1 << 18)
 
 #define BP_GPMI_CTRL1_DLL_ENABLE			17