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@xxxxxx>
---
drivers/spi/spi-ti-qspi.c | 29 +++++++++++++++++++++++++++++
1 files changed, 29 insertions(+), 0 deletions(-)
diff --git a/drivers/spi/spi-ti-qspi.c b/drivers/spi/spi-ti-qspi.c
index 48294d1..e4a8afc 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 +224,30 @@ static int ti_qspi_setup(struct spi_device *spi)
return 0;
}
+static void ti_qspi_configure_from_slave(struct spi_device *spi)
+{
+ struct ti_qspi *qspi = spi_master_get_devdata(spi->master);
+ struct slave_info info = spi->info;
+ u32 memval, mode;
+
+ mode = spi->mode & (SPI_RX_DUAL | SPI_RX_QUAD);
+ memval = (info.read_opcode << 0) | (info.program_opcode << 16) |
+ ((info.addr_width - 1) << 8) | (info.dummy_cycles << 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;
@@ -488,6 +516,7 @@ static int ti_qspi_probe(struct platform_device *pdev)
master->dev.of_node = pdev->dev.of_node;
master->bits_per_word_mask = BIT(32 - 1) | BIT(16 - 1) | BIT(8 - 1);
master->mmap = true;
+ 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
--
To unsubscribe from this list: send the line "unsubscribe linux-omap" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
