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.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:
You want to catch invalid/unsupported mode here instead, so please add 'case 0:'
for 1-bit transfer and treat default: as an error .
> + 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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