[PATCH v1 06/11] spi: dw: send cmd and addr to start the spi transfer

[Changhuang Liang <changhuang.liang@starfivetech.com>]

From: Sudip Mukherjee <sudip.mukherjee@sifive.com>

In enhanced spi mode, read or write will start by sending the cmd
and address (if present).

Signed-off-by: Sudip Mukherjee <sudip.mukherjee@sifive.com>
Co-developed-by: Changhuang Liang <changhuang.liang@starfivetech.com>
Signed-off-by: Changhuang Liang <changhuang.liang@starfivetech.com>
---
 drivers/spi/spi-dw-core.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/spi/spi-dw-core.c b/drivers/spi/spi-dw-core.c
index 9f3ee1d78c05..9f0f7e0b93a1 100644
--- a/drivers/spi/spi-dw-core.c
+++ b/drivers/spi/spi-dw-core.c
@@ -836,6 +836,19 @@ static void dw_spi_init_enh_mem_buf(struct dw_spi *dws, const struct spi_mem_op
 	}
 }
 
+static void dw_spi_enh_write_cmd_addr(struct dw_spi *dws, const struct spi_mem_op *op)
+{
+	/* Send cmd as 32 bit value */
+	dw_write_io_reg(dws, DW_SPI_DR, op->cmd.opcode);
+	if (op->addr.nbytes) {
+		dw_write_io_reg(dws, DW_SPI_DR, lower_32_bits(op->addr.val));
+		if (op->addr.nbytes > 4) {
+			/* address more than 32bit */
+			dw_write_io_reg(dws, DW_SPI_DR, upper_32_bits(op->addr.val));
+		}
+	}
+}
+
 static int dw_spi_exec_enh_mem_op(struct spi_mem *mem, const struct spi_mem_op *op)
 {
 	struct spi_controller *ctlr = mem->spi->controller;
@@ -895,6 +908,8 @@ static int dw_spi_exec_enh_mem_op(struct spi_mem *mem, const struct spi_mem_op *
 
 	dw_spi_enable_chip(dws, 1);
 
+	dw_spi_enh_write_cmd_addr(dws, op);
+
 	return 0;
 }
 
-- 
2.25.1