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authorMark Brown <broonie@linaro.org>2013-06-26 16:21:06 +0100
committerMark Brown <broonie@linaro.org>2013-06-26 16:21:06 +0100
commited893559c9799df3b32051871c22017151394d82 (patch)
tree09b08825a81f00911a66b4c133fc9f00d6c4548d /drivers/spi/spi-xilinx.c
parent592cd34d9431736493c375b609f7f7d4458a8637 (diff)
parent913b19660e166e718d419cccd753c3990881f17c (diff)
downloadlinux-ed893559c9799df3b32051871c22017151394d82.tar.bz2
Merge remote-tracking branch 'spi/topic/xilinx' into spi-next
Diffstat (limited to 'drivers/spi/spi-xilinx.c')
-rw-r--r--drivers/spi/spi-xilinx.c30
1 files changed, 21 insertions, 9 deletions
diff --git a/drivers/spi/spi-xilinx.c b/drivers/spi/spi-xilinx.c
index 96b392843814..fb56fcfdf65e 100644
--- a/drivers/spi/spi-xilinx.c
+++ b/drivers/spi/spi-xilinx.c
@@ -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
@@ -340,11 +341,12 @@ 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)
@@ -376,13 +378,25 @@ 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;
@@ -446,14 +460,13 @@ 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;
}
@@ -485,7 +498,7 @@ 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;
@@ -501,7 +514,6 @@ static int xilinx_spi_probe(struct platform_device *dev)
static int xilinx_spi_remove(struct platform_device *dev)
{
xilinx_spi_deinit(platform_get_drvdata(dev));
- platform_set_drvdata(dev, 0);
return 0;
}