On Tuesday 10 December 2013 06:27 PM, Marek Vasut wrote:
On Friday, December 06, 2013 at 03:24:45 PM, Sourav Poddar wrote:
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.pod...@ti.com>
---
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:
You want to catch invalid/unsupported mode here instead, so please add 'case 0:'
for 1-bit transfer and treat default: as an error .
Ok. make sense. will change that in v3.
+ 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;
Best regards,
Marek Vasut
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