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spi: spi-xilinx: Add run run-time endian detection 

Do not load endian value from platform data
and rather autodetect it.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Michal Simek 2013-06-04 16:02:36 +02:00 committed by Mark Brown
parent d683b96b07
commit 082339bc63
3 changed files with 21 additions and 10 deletions
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1
drivers/mfd/timberdale.c
View File

@ -145,7 +145,6 @@ static struct spi_board_info timberdale_spi_8bit_board_info[] = {
static struct xspi_platform_data timberdale_xspi_platform_data = {
.num_chipselect = 3,
.little_endian = true,
/* bits per word and devices will be filled in runtime depending
* on the HW config
*/

29
drivers/spi/spi-xilinx.c
View File

@ -30,6 +30,7 @@
*/
#define XSPI_CR_OFFSET 0x60 /* Control Register */
#define XSPI_CR_LOOP 0x01
#define XSPI_CR_ENABLE 0x02
#define XSPI_CR_MASTER_MODE 0x04
#define XSPI_CR_CPOL 0x08
@ -359,11 +360,12 @@ static const struct of_device_id xilinx_spi_of_match[] = {
MODULE_DEVICE_TABLE(of, xilinx_spi_of_match);
struct spi_master *xilinx_spi_init(struct device *dev, struct resource *mem,
u32 irq, s16 bus_num, int num_cs, int little_endian, int bits_per_word)
u32 irq, s16 bus_num, int num_cs, int bits_per_word)
{
struct spi_master *master;
struct xilinx_spi *xspi;
int ret;
u32 tmp;
master = spi_alloc_master(dev, sizeof(struct xilinx_spi));
if (!master)
@ -396,13 +398,25 @@ struct spi_master *xilinx_spi_init(struct device *dev, struct resource *mem,
xspi->mem = *mem;
xspi->irq = irq;
if (little_endian) {
xspi->read_fn = xspi_read32;
xspi->write_fn = xspi_write32;
} else {
/*
* Detect endianess on the IP via loop bit in CR. Detection
* must be done before reset is sent because incorrect reset
* value generates error interrupt.
* Setup little endian helper functions first and try to use them
* and check if bit was correctly setup or not.
*/
xspi->read_fn = xspi_read32;
xspi->write_fn = xspi_write32;
xspi->write_fn(XSPI_CR_LOOP, xspi->regs + XSPI_CR_OFFSET);
tmp = xspi->read_fn(xspi->regs + XSPI_CR_OFFSET);
tmp &= XSPI_CR_LOOP;
if (tmp != XSPI_CR_LOOP) {
xspi->read_fn = xspi_read32_be;
xspi->write_fn = xspi_write32_be;
}
xspi->bits_per_word = bits_per_word;
if (xspi->bits_per_word == 8) {
xspi->tx_fn = xspi_tx8;
@ -466,14 +480,13 @@ static int xilinx_spi_probe(struct platform_device *dev)
{
struct xspi_platform_data *pdata;
struct resource *r;
int irq, num_cs = 0, little_endian = 0, bits_per_word = 8;
int irq, num_cs = 0, bits_per_word = 8;
struct spi_master *master;
u8 i;
pdata = dev->dev.platform_data;
if (pdata) {
num_cs = pdata->num_chipselect;
little_endian = pdata->little_endian;
bits_per_word = pdata->bits_per_word;
}
@ -505,7 +518,7 @@ static int xilinx_spi_probe(struct platform_device *dev)
return -ENXIO;
master = xilinx_spi_init(&dev->dev, r, irq, dev->id, num_cs,
little_endian, bits_per_word);
bits_per_word);
if (!master)
return -ENODEV;

1
include/linux/spi/xilinx_spi.h
View File

@ -11,7 +11,6 @@
*/
struct xspi_platform_data {
u16 num_chipselect;
bool little_endian;
u8 bits_per_word;
struct spi_board_info *devices;
u8 num_devices;