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path: root/drivers/spi/spi-davinci.c
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Diffstat (limited to 'drivers/spi/spi-davinci.c')
-rw-r--r--drivers/spi/spi-davinci.c72
1 files changed, 53 insertions, 19 deletions
diff --git a/drivers/spi/spi-davinci.c b/drivers/spi/spi-davinci.c
index 50f750989258..276a3884fb3c 100644
--- a/drivers/spi/spi-davinci.c
+++ b/drivers/spi/spi-davinci.c
@@ -30,6 +30,7 @@
#include <linux/edma.h>
#include <linux/of.h>
#include <linux/of_device.h>
+#include <linux/of_gpio.h>
#include <linux/spi/spi.h>
#include <linux/spi/spi_bitbang.h>
#include <linux/slab.h>
@@ -38,8 +39,6 @@
#define SPI_NO_RESOURCE ((resource_size_t)-1)
-#define SPI_MAX_CHIPSELECT 2
-
#define CS_DEFAULT 0xFF
#define SPIFMT_PHASE_MASK BIT(16)
@@ -142,7 +141,7 @@ struct davinci_spi {
void (*get_rx)(u32 rx_data, struct davinci_spi *);
u32 (*get_tx)(struct davinci_spi *);
- u8 bytes_per_word[SPI_MAX_CHIPSELECT];
+ u8 *bytes_per_word;
};
static struct davinci_spi_config davinci_spi_default_cfg;
@@ -213,13 +212,16 @@ static void davinci_spi_chipselect(struct spi_device *spi, int value)
u8 chip_sel = spi->chip_select;
u16 spidat1 = CS_DEFAULT;
bool gpio_chipsel = false;
+ int gpio;
dspi = spi_master_get_devdata(spi->master);
pdata = &dspi->pdata;
- if (pdata->chip_sel && chip_sel < pdata->num_chipselect &&
- pdata->chip_sel[chip_sel] != SPI_INTERN_CS)
+ if (spi->cs_gpio >= 0) {
+ /* SPI core parse and update master->cs_gpio */
gpio_chipsel = true;
+ gpio = spi->cs_gpio;
+ }
/*
* Board specific chip select logic decides the polarity and cs
@@ -227,9 +229,9 @@ static void davinci_spi_chipselect(struct spi_device *spi, int value)
*/
if (gpio_chipsel) {
if (value == BITBANG_CS_ACTIVE)
- gpio_set_value(pdata->chip_sel[chip_sel], 0);
+ gpio_set_value(gpio, spi->mode & SPI_CS_HIGH);
else
- gpio_set_value(pdata->chip_sel[chip_sel], 1);
+ gpio_set_value(gpio, !(spi->mode & SPI_CS_HIGH));
} else {
if (value == BITBANG_CS_ACTIVE) {
spidat1 |= SPIDAT1_CSHOLD_MASK;
@@ -392,17 +394,40 @@ static int davinci_spi_setup(struct spi_device *spi)
int retval = 0;
struct davinci_spi *dspi;
struct davinci_spi_platform_data *pdata;
+ 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 ((pdata->chip_sel == NULL) ||
- (pdata->chip_sel[spi->chip_select] == SPI_INTERN_CS))
- set_io_bits(dspi->base + SPIPC0, 1 << spi->chip_select);
+ if (np && (master->cs_gpios != NULL) && (spi->cs_gpio >= 0)) {
+ retval = gpio_request_one(spi->cs_gpio,
+ flags, dev_name(&spi->dev));
+ 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);
+
if (spi->mode & SPI_READY)
set_io_bits(dspi->base + SPIPC0, SPIPC0_SPIENA_MASK);
@@ -414,6 +439,12 @@ static int davinci_spi_setup(struct spi_device *spi)
return retval;
}
+static void davinci_spi_cleanup(struct spi_device *spi)
+{
+ if (spi->cs_gpio >= 0)
+ gpio_free(spi->cs_gpio);
+}
+
static int davinci_spi_check_error(struct davinci_spi *dspi, int int_status)
{
struct device *sdev = dspi->bitbang.master->dev.parent;
@@ -812,6 +843,8 @@ static int spi_davinci_get_pdata(struct platform_device *pdev,
/*
* default num_cs is 1 and all chipsel are internal to the chip
+ * indicated by chip_sel being NULL or cs_gpios being NULL or
+ * set to -ENOENT. num-cs includes internal as well as gpios.
* indicated by chip_sel being NULL. GPIO based CS is not
* supported yet in DT bindings.
*/
@@ -850,7 +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));
@@ -876,6 +909,14 @@ static int davinci_spi_probe(struct platform_device *pdev)
/* pdata in dspi is now updated and point pdata to that */
pdata = &dspi->pdata;
+ dspi->bytes_per_word = devm_kzalloc(&pdev->dev,
+ sizeof(*dspi->bytes_per_word) *
+ pdata->num_chipselect, GFP_KERNEL);
+ if (dspi->bytes_per_word == NULL) {
+ ret = -ENOMEM;
+ goto free_master;
+ }
+
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (r == NULL) {
ret = -ENOENT;
@@ -915,6 +956,7 @@ static int davinci_spi_probe(struct platform_device *pdev)
master->num_chipselect = pdata->num_chipselect;
master->bits_per_word_mask = SPI_BPW_RANGE_MASK(2, 16);
master->setup = davinci_spi_setup;
+ master->cleanup = davinci_spi_cleanup;
dspi->bitbang.chipselect = davinci_spi_chipselect;
dspi->bitbang.setup_transfer = davinci_spi_setup_transfer;
@@ -962,14 +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
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-17 10:10:44 +0000