[PATCH 07/17] spi/qspi: configure set up register for memory map..

[Sourav Poddar]

These add api to configure set up registers which will be used
for memory mapped operations.

These was provided as a pointer in the earlier patch and can be
used by the slave devices to configure the master controller as an
when required according to the usecases.

Signed-off-by: Sourav Poddar <sourav.poddar at ti.com>
---
 drivers/spi/spi-ti-qspi.c |   28 ++++++++++++++++++++++++++++
 1 files changed, 28 insertions(+), 0 deletions(-)

diff --git a/drivers/spi/spi-ti-qspi.c b/drivers/spi/spi-ti-qspi.c
index 40f1c35..2323572 100644
--- a/drivers/spi/spi-ti-qspi.c
+++ b/drivers/spi/spi-ti-qspi.c
@@ -117,6 +117,10 @@ struct ti_qspi {
 #define MEM_CS		(1 << 8)
 #define MEM_CS_DIS	(0 << 8)
 
+#define QSPI_SETUP0_RD_NORMAL   (0x0 << 12)
+#define QSPI_SETUP0_RD_DUAL     (0x1 << 12)
+#define QSPI_SETUP0_RD_QUAD     (0x3 << 12)
+
 #define	QSPI_FRAME			4096
 
 #define QSPI_AUTOSUSPEND_TIMEOUT         2000
@@ -220,6 +224,29 @@ static int ti_qspi_setup(struct spi_device *spi)
 	return 0;
 }
 
+static void ti_qspi_configure_from_slave(struct spi_device *spi, u8 *val)
+{
+	struct ti_qspi  *qspi = spi_master_get_devdata(spi->master);
+	u32 memval, mode;
+
+	mode = spi->mode & (SPI_RX_DUAL | SPI_RX_QUAD);
+	memval =  (val[0] << 0) | (val[1] << 16) |
+			((val[2] - 1) << 8) | (val[3] << 10);
+
+	switch (mode) {
+	case SPI_RX_DUAL:
+		memval |= QSPI_SETUP0_RD_DUAL;
+		break;
+	case SPI_RX_QUAD:
+		memval |= QSPI_SETUP0_RD_QUAD;
+		break;
+	default:
+		memval |= QSPI_SETUP0_RD_NORMAL;
+		break;
+	}
+	ti_qspi_write(qspi, memval, QSPI_SPI_SETUP0_REG);
+}
+
 static void ti_qspi_restore_ctx(struct ti_qspi *qspi)
 {
 	struct ti_qspi_regs *ctx_reg = &qspi->ctx_reg;
@@ -487,6 +514,7 @@ static int ti_qspi_probe(struct platform_device *pdev)
 	master->transfer_one_message = ti_qspi_start_transfer_one;
 	master->dev.of_node = pdev->dev.of_node;
 	master->bits_per_word_mask = BIT(32 - 1) | BIT(16 - 1) | BIT(8 - 1);
+	master->configure_from_slave = ti_qspi_configure_from_slave;
 
 	if (!of_property_read_u32(np, "num-cs", &num_cs))
 		master->num_chipselect = num_cs;
-- 
1.7.1