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spi: rspi: Add support for loopback mode 

Add support for specifying loopback mode.

Signed-off-by: Geert Uytterhoeven <geert+renesas@linux-m68k.org>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Geert Uytterhoeven 2014-01-24 09:44:00 +01:00 committed by Mark Brown
parent 862d357f84
commit 06a7a3cff0
1 changed files with 14 additions and 8 deletions
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22
drivers/spi/spi-rspi.c
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@ -183,8 +183,9 @@ struct rspi_data {
struct spi_master *master;
wait_queue_head_t wait;
struct clk *clk;
u8 spsr;
u16 spcmd;
u8 spsr;
u8 sppcr;
int rx_irq, tx_irq;
const struct spi_ops *ops;
@ -252,8 +253,8 @@ static int rspi_set_config_register(struct rspi_data *rspi, int access_size)
{
int spbr;
/* Sets output mode(CMOS) and MOSI signal(from previous transfer) */
rspi_write8(rspi, 0x00, RSPI_SPPCR);
/* Sets output mode, MOSI signal, and (optionally) loopback */
rspi_write8(rspi, rspi->sppcr, RSPI_SPPCR);
/* Sets transfer bit rate */
spbr = clk_get_rate(rspi->clk) / (2 * rspi->max_speed_hz) - 1;
@ -288,8 +289,8 @@ static int rspi_rz_set_config_register(struct rspi_data *rspi, int access_size)
{
int spbr;
/* Sets output mode */
rspi_write8(rspi, 0x00, RSPI_SPPCR);
/* Sets output mode, MOSI signal, and (optionally) loopback */
rspi_write8(rspi, rspi->sppcr, RSPI_SPPCR);
/* Sets transfer bit rate */
spbr = clk_get_rate(rspi->clk) / (2 * rspi->max_speed_hz) - 1;
@ -322,8 +323,8 @@ static int qspi_set_config_register(struct rspi_data *rspi, int access_size)
u16 spcmd;
int spbr;
/* Sets output mode(CMOS) and MOSI signal(from previous transfer) */
rspi_write8(rspi, 0x00, RSPI_SPPCR);
/* Sets output mode, MOSI signal, and (optionally) loopback */
rspi_write8(rspi, rspi->sppcr, RSPI_SPPCR);
/* Sets transfer bit rate */
spbr = clk_get_rate(rspi->clk) / (2 * rspi->max_speed_hz);
@ -829,6 +830,11 @@ static int rspi_setup(struct spi_device *spi)
if (spi->mode & SPI_CPHA)
rspi->spcmd |= SPCMD_CPHA;
/* CMOS output mode and MOSI signal from previous transfer */
rspi->sppcr = 0;
if (spi->mode & SPI_LOOP)
rspi->sppcr |= SPPCR_SPLP;
set_config_register(rspi, 8);
return 0;
@ -1050,7 +1056,7 @@ static int rspi_probe(struct platform_device *pdev)
master->cleanup = rspi_cleanup;
master->prepare_message = rspi_prepare_message;
master->unprepare_message = rspi_unprepare_message;
master->mode_bits = SPI_CPHA | SPI_CPOL;
master->mode_bits = SPI_CPHA | SPI_CPOL | SPI_LOOP;
ret = platform_get_irq_byname(pdev, "rx");
if (ret < 0) {