spi: cadence_qspi: Add quad write support

Use quad write if SPI_TX_QUAD flag is set.

Tested quad write on Stratix 10 SoC board (Micron
serial NOR flash, mt25qu02g)
Signed-off-by: NLey Foon Tan <ley.foon.tan@intel.com>
Reviewed-by: NJagan Teki <jagan@openedev.com>

drivers/spi/cadence_qspi.c

@@ -256,7 +256,7 @@ static int cadence_spi_xfer(struct udevice *dev, unsigned int bitlen,
 		break;
 		case CQSPI_INDIRECT_WRITE:
 			err = cadence_qspi_apb_indirect_write_setup
-				(plat, priv->cmd_len, cmd_buf);
+				(plat, priv->cmd_len, dm_plat->mode, cmd_buf);
 			if (!err) {
 				err = cadence_qspi_apb_indirect_write_execute
 				(plat, data_bytes, dout);

drivers/spi/cadence_qspi.h

@@ -60,7 +60,7 @@ int cadence_qspi_apb_indirect_read_setup(struct cadence_spi_platdata *plat,
 int cadence_qspi_apb_indirect_read_execute(struct cadence_spi_platdata *plat,
 	unsigned int rxlen, u8 *rxbuf);
 int cadence_qspi_apb_indirect_write_setup(struct cadence_spi_platdata *plat,
-	unsigned int cmdlen, const u8 *cmdbuf);
+	unsigned int cmdlen, unsigned int tx_width, const u8 *cmdbuf);
 int cadence_qspi_apb_indirect_write_execute(struct cadence_spi_platdata *plat,
 	unsigned int txlen, const u8 *txbuf);
 

drivers/spi/cadence_qspi_apb.c

@@ -77,6 +77,7 @@
 
 #define	CQSPI_REG_WR_INSTR			0x08
 #define	CQSPI_REG_WR_INSTR_OPCODE_LSB		0
+#define	CQSPI_REG_WR_INSTR_TYPE_DATA_LSB	16
 
 #define	CQSPI_REG_DELAY				0x0C
 #define	CQSPI_REG_DELAY_TSLCH_LSB		0
@@ -686,7 +687,7 @@ failrd:
 
 /* Opcode + Address (3/4 bytes) */
 int cadence_qspi_apb_indirect_write_setup(struct cadence_spi_platdata *plat,
-	unsigned int cmdlen, const u8 *cmdbuf)
+	unsigned int cmdlen, unsigned int tx_width, const u8 *cmdbuf)
 {
 	unsigned int reg;
 	unsigned int addr_bytes = cmdlen > 4 ? 4 : 3;
@@ -702,6 +703,10 @@ int cadence_qspi_apb_indirect_write_setup(struct cadence_spi_platdata *plat,
 
 	/* Configure the opcode */
 	reg = cmdbuf[0] << CQSPI_REG_WR_INSTR_OPCODE_LSB;
+
+	if (tx_width & SPI_TX_QUAD)
+		reg |= CQSPI_INST_TYPE_QUAD << CQSPI_REG_WR_INSTR_TYPE_DATA_LSB;
+
 	writel(reg, plat->regbase + CQSPI_REG_WR_INSTR);
 
 	/* Setup write address. */