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authorGabor Juhos <juhosg@openwrt.org>2012-12-27 10:42:28 +0100
committerGrant Likely <grant.likely@secretlab.ca>2013-02-05 12:59:47 +0000
commitc4a31f43005512b366e8bfc346e7f14c1a7a1ba7 (patch)
treeb1f49e52ffc5abc0563480bd8ac36cae142ef5d4 /drivers/spi
parent95d79419feffb326a3d5cb50e2248129dec06bb0 (diff)
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spi/ath79: avoid multiple initialization of the SPI controller
Currently we are initializing the SPI controller in the chip select line function, and that function is called once for each SPI device on the bus. If a board has multiple SPI devices, the controller will be initialized multiple times. Introduce ath79_spi_{en,dis}able helper functions, and call those from probe/response in order to avoid the mutliple initialization of the controller. Signed-off-by: Gabor Juhos <juhosg@openwrt.org> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'drivers/spi')
-rw-r--r--drivers/spi/spi-ath79.c41
1 files changed, 24 insertions, 17 deletions
diff --git a/drivers/spi/spi-ath79.c b/drivers/spi/spi-ath79.c
index 19d539e3630..842acd8983e 100644
--- a/drivers/spi/spi-ath79.c
+++ b/drivers/spi/spi-ath79.c
@@ -96,16 +96,8 @@ static void ath79_spi_chipselect(struct spi_device *spi, int is_active)
}
-static int ath79_spi_setup_cs(struct spi_device *spi)
+static void ath79_spi_enable(struct ath79_spi *sp)
{
- struct ath79_spi *sp = ath79_spidev_to_sp(spi);
- struct ath79_spi_controller_data *cdata;
- int status;
-
- cdata = spi->controller_data;
- if (spi->chip_select && !cdata)
- return -EINVAL;
-
/* enable GPIO mode */
ath79_spi_wr(sp, AR71XX_SPI_REG_FS, AR71XX_SPI_FS_GPIO);
@@ -115,6 +107,24 @@ static int ath79_spi_setup_cs(struct spi_device *spi)
/* TODO: setup speed? */
ath79_spi_wr(sp, AR71XX_SPI_REG_CTRL, 0x43);
+}
+
+static void ath79_spi_disable(struct ath79_spi *sp)
+{
+ /* restore CTRL register */
+ ath79_spi_wr(sp, AR71XX_SPI_REG_CTRL, sp->reg_ctrl);
+ /* disable GPIO mode */
+ ath79_spi_wr(sp, AR71XX_SPI_REG_FS, 0);
+}
+
+static int ath79_spi_setup_cs(struct spi_device *spi)
+{
+ struct ath79_spi_controller_data *cdata;
+ int status;
+
+ cdata = spi->controller_data;
+ if (spi->chip_select && !cdata)
+ return -EINVAL;
status = 0;
if (spi->chip_select) {
@@ -135,17 +145,10 @@ static int ath79_spi_setup_cs(struct spi_device *spi)
static void ath79_spi_cleanup_cs(struct spi_device *spi)
{
- struct ath79_spi *sp = ath79_spidev_to_sp(spi);
-
if (spi->chip_select) {
struct ath79_spi_controller_data *cdata = spi->controller_data;
gpio_free(cdata->gpio);
}
-
- /* restore CTRL register */
- ath79_spi_wr(sp, AR71XX_SPI_REG_CTRL, sp->reg_ctrl);
- /* disable GPIO mode */
- ath79_spi_wr(sp, AR71XX_SPI_REG_FS, 0);
}
static int ath79_spi_setup(struct spi_device *spi)
@@ -268,12 +271,15 @@ static int ath79_spi_probe(struct platform_device *pdev)
dev_dbg(&pdev->dev, "register read/write delay is %u nsecs\n",
sp->rrw_delay);
+ ath79_spi_enable(sp);
ret = spi_bitbang_start(&sp->bitbang);
if (ret)
- goto err_clk_disable;
+ goto err_disable;
return 0;
+err_disable:
+ ath79_spi_disable(sp);
err_clk_disable:
clk_disable(sp->clk);
err_clk_put:
@@ -292,6 +298,7 @@ static int ath79_spi_remove(struct platform_device *pdev)
struct ath79_spi *sp = platform_get_drvdata(pdev);
spi_bitbang_stop(&sp->bitbang);
+ ath79_spi_disable(sp);
clk_disable(sp->clk);
clk_put(sp->clk);
iounmap(sp->base);