Techwizz/kernel-fxtec-pro1x
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

spi: davinci: use spi_device.cs_gpio to store gpio cs per spi device

Browse source 
Rework Davinci SPI driver to store GPIO CS number in cs_gpio field
of SPI device structure (spi_device) for both DT and non-DT cases.
This will make Davinci SPI driver code simpler and allows to reuse
more SPI core functionality.

Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Grygorii Strashko 2014-08-01 19:40:33 +03:00 committed by Mark Brown
parent a88e34ea21
commit c060014063
1 changed files with 17 additions and 37 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

54
drivers/spi/spi-davinci.c
View file

@ -208,9 +208,7 @@ static inline void clear_io_bits(void __iomem *addr, u32 bits)
static void davinci_spi_chipselect(struct spi_device *spi, int value)
{
struct davinci_spi *dspi;
struct device_node *np = spi->dev.of_node;
struct davinci_spi_platform_data *pdata;
struct spi_master *master = spi->master;
u8 chip_sel = spi->chip_select;
u16 spidat1 = CS_DEFAULT;
bool gpio_chipsel = false;
@ -219,16 +217,10 @@ static void davinci_spi_chipselect(struct spi_device *spi, int value)
dspi = spi_master_get_devdata(spi->master);
pdata = &dspi->pdata;
if (np && master->cs_gpios != NULL && spi->cs_gpio >= 0) {
if (spi->cs_gpio >= 0) {
/* SPI core parse and update master->cs_gpio */
gpio_chipsel = true;
gpio = spi->cs_gpio;
} else if (pdata->chip_sel &&
chip_sel < pdata->num_chipselect &&
pdata->chip_sel[chip_sel] != SPI_INTERN_CS) {
/* platform data defines chip_sel */
gpio_chipsel = true;
gpio = pdata->chip_sel[chip_sel];
}
/*
@ -237,9 +229,9 @@ static void davinci_spi_chipselect(struct spi_device *spi, int value)
*/
if (gpio_chipsel) {
if (value == BITBANG_CS_ACTIVE)
gpio_set_value(gpio, 0);
gpio_set_value(gpio, spi->mode & SPI_CS_HIGH);
else
gpio_set_value(gpio, 1);
gpio_set_value(gpio, !(spi->mode & SPI_CS_HIGH));
} else {
if (value == BITBANG_CS_ACTIVE) {
spidat1 |= SPIDAT1_CSHOLD_MASK;
@ -405,35 +397,34 @@ static int davinci_spi_setup(struct spi_device *spi)
struct spi_master *master = spi->master;
struct device_node *np = spi->dev.of_node;
bool internal_cs = true;
unsigned long flags = GPIOF_DIR_OUT;
dspi = spi_master_get_devdata(spi->master);
pdata = &dspi->pdata;
flags |= (spi->mode & SPI_CS_HIGH) ? GPIOF_INIT_LOW : GPIOF_INIT_HIGH;
if (!(spi->mode & SPI_NO_CS)) {
if (np && (master->cs_gpios != NULL) && (spi->cs_gpio >= 0)) {
unsigned long flags;
flags = GPIOF_DIR_OUT;
if (spi->mode & SPI_CS_HIGH)
flags |= GPIOF_INIT_LOW;
else
flags |= GPIOF_INIT_HIGH;
retval = gpio_request_one(spi->cs_gpio,
flags, dev_name(&spi->dev));
if (retval) {
dev_err(&spi->dev,
"GPIO %d request failed (%d)\n",
spi->cs_gpio, retval);
return retval;
}
internal_cs = false;
} else if (pdata->chip_sel &&
spi->chip_select < pdata->num_chipselect &&
pdata->chip_sel[spi->chip_select] != SPI_INTERN_CS) {
spi->cs_gpio = pdata->chip_sel[spi->chip_select];
retval = gpio_request_one(spi->cs_gpio,
flags, dev_name(&spi->dev));
internal_cs = false;
}
}
if (retval) {
dev_err(&spi->dev, "GPIO %d setup failed (%d)\n",
spi->cs_gpio, retval);
return retval;
}
if (internal_cs)
set_io_bits(dspi->base + SPIPC0, 1 << spi->chip_select);
@ -450,10 +441,7 @@ static int davinci_spi_setup(struct spi_device *spi)
static void davinci_spi_cleanup(struct spi_device *spi)
{
struct spi_master *master = spi->master;
struct device_node *np = spi->dev.of_node;
if (np && (master->cs_gpios != NULL) && (spi->cs_gpio >= 0))
if (spi->cs_gpio >= 0)
gpio_free(spi->cs_gpio);
}
@ -895,7 +883,7 @@ static int davinci_spi_probe(struct platform_device *pdev)
struct resource *r;
resource_size_t dma_rx_chan = SPI_NO_RESOURCE;
resource_size_t dma_tx_chan = SPI_NO_RESOURCE;
int i = 0, ret = 0;
int ret = 0;
u32 spipc0;
master = spi_alloc_master(&pdev->dev, sizeof(struct davinci_spi));
@ -1016,14 +1004,6 @@ static int davinci_spi_probe(struct platform_device *pdev)
spipc0 = SPIPC0_DIFUN_MASK | SPIPC0_DOFUN_MASK | SPIPC0_CLKFUN_MASK;
iowrite32(spipc0, dspi->base + SPIPC0);
/* initialize chip selects */
if (pdata->chip_sel) {
for (i = 0; i < pdata->num_chipselect; i++) {
if (pdata->chip_sel[i] != SPI_INTERN_CS)
gpio_direction_output(pdata->chip_sel[i], 1);
}
}
if (pdata->intr_line)
iowrite32(SPI_INTLVL_1, dspi->base + SPILVL);
else