diff options
| author | Uwe Kleine-König <u.kleine-koenig@pengutronix.de> | 2009-10-01 15:44:33 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-10-01 16:11:17 -0700 |
| commit | e6a0a8bfef1094084e53bfaad6d512c23da7a6dd (patch) | |
| tree | 5c543b2628fb840fc7013c57ea22c812f2bea63e /drivers/spi | |
| parent | d1c627b59c8e69d40b94a4ff28a582a84c6a95a3 (diff) | |
spi-imx: strip down chipselect function to only drive the chipselect
spi_imx_chipselect() made things that should be (and mostly are) done by
spi_imx_setupxfer. Only setting the tx and rx functions was missing.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Cc: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/spi_imx.c | 50 |
1 files changed, 17 insertions, 33 deletions
diff --git a/drivers/spi/spi_imx.c b/drivers/spi/spi_imx.c index 2fec1170b6c..89c22efedfb 100644 --- a/drivers/spi/spi_imx.c +++ b/drivers/spi/spi_imx.c @@ -354,43 +354,14 @@ static int mx1_rx_available(struct spi_imx_data *spi_imx) static void spi_imx_chipselect(struct spi_device *spi, int is_active) { struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master); - unsigned int cs = 0; int gpio = spi_imx->chipselect[spi->chip_select]; - struct spi_imx_config config; - - if (spi->mode & SPI_CS_HIGH) - cs = 1; + int active = is_active != BITBANG_CS_INACTIVE; + int dev_is_lowactive = !(spi->mode & SPI_CS_HIGH); - if (is_active == BITBANG_CS_INACTIVE) { - if (gpio >= 0) - gpio_set_value(gpio, !cs); + if (gpio < 0) return; - } - - config.bpw = spi->bits_per_word; - config.speed_hz = spi->max_speed_hz; - config.mode = spi->mode; - config.cs = spi_imx->chipselect[spi->chip_select]; - - spi_imx->config(spi_imx, &config); - - /* Initialize the functions for transfer */ - if (config.bpw <= 8) { - spi_imx->rx = spi_imx_buf_rx_u8; - spi_imx->tx = spi_imx_buf_tx_u8; - } else if (config.bpw <= 16) { - spi_imx->rx = spi_imx_buf_rx_u16; - spi_imx->tx = spi_imx_buf_tx_u16; - } else if (config.bpw <= 32) { - spi_imx->rx = spi_imx_buf_rx_u32; - spi_imx->tx = spi_imx_buf_tx_u32; - } else - BUG(); - - if (gpio >= 0) - gpio_set_value(gpio, cs); - return; + gpio_set_value(gpio, dev_is_lowactive ^ active); } static void spi_imx_push(struct spi_imx_data *spi_imx) @@ -451,6 +422,19 @@ static int spi_imx_setupxfer(struct spi_device *spi, if (!config.speed_hz) config.speed_hz = spi->max_speed_hz; + /* Initialize the functions for transfer */ + if (config.bpw <= 8) { + spi_imx->rx = spi_imx_buf_rx_u8; + spi_imx->tx = spi_imx_buf_tx_u8; + } else if (config.bpw <= 16) { + spi_imx->rx = spi_imx_buf_rx_u16; + spi_imx->tx = spi_imx_buf_tx_u16; + } else if (config.bpw <= 32) { + spi_imx->rx = spi_imx_buf_rx_u32; + spi_imx->tx = spi_imx_buf_tx_u32; + } else + BUG(); + spi_imx->config(spi_imx, &config); return 0; |