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path: root/drivers/spi/spi_mpc8xxx.c
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Diffstat (limited to 'drivers/spi/spi_mpc8xxx.c')
-rw-r--r--drivers/spi/spi_mpc8xxx.c125
1 files changed, 83 insertions, 42 deletions
diff --git a/drivers/spi/spi_mpc8xxx.c b/drivers/spi/spi_mpc8xxx.c
index e324627d97a..ffa111a7e9d 100644
--- a/drivers/spi/spi_mpc8xxx.c
+++ b/drivers/spi/spi_mpc8xxx.c
@@ -241,7 +241,6 @@ static void mpc8xxx_spi_change_mode(struct spi_device *spi)
/* Turn off SPI unit prior changing mode */
mpc8xxx_spi_write_reg(mode, cs->hw_mode & ~SPMODE_ENABLE);
- mpc8xxx_spi_write_reg(mode, cs->hw_mode);
/* When in CPM mode, we need to reinit tx and rx. */
if (mspi->flags & SPI_CPM_MODE) {
@@ -258,7 +257,7 @@ static void mpc8xxx_spi_change_mode(struct spi_device *spi)
}
}
}
-
+ mpc8xxx_spi_write_reg(mode, cs->hw_mode);
local_irq_restore(flags);
}
@@ -287,36 +286,12 @@ static void mpc8xxx_spi_chipselect(struct spi_device *spi, int value)
}
}
-static
-int mpc8xxx_spi_setup_transfer(struct spi_device *spi, struct spi_transfer *t)
+static int
+mspi_apply_cpu_mode_quirks(struct spi_mpc8xxx_cs *cs,
+ struct spi_device *spi,
+ struct mpc8xxx_spi *mpc8xxx_spi,
+ int bits_per_word)
{
- struct mpc8xxx_spi *mpc8xxx_spi;
- u8 bits_per_word, pm;
- u32 hz;
- struct spi_mpc8xxx_cs *cs = spi->controller_state;
-
- mpc8xxx_spi = spi_master_get_devdata(spi->master);
-
- if (t) {
- bits_per_word = t->bits_per_word;
- hz = t->speed_hz;
- } else {
- bits_per_word = 0;
- hz = 0;
- }
-
- /* spi_transfer level calls that work per-word */
- if (!bits_per_word)
- bits_per_word = spi->bits_per_word;
-
- /* Make sure its a bit width we support [4..16, 32] */
- if ((bits_per_word < 4)
- || ((bits_per_word > 16) && (bits_per_word != 32)))
- return -EINVAL;
-
- if (!hz)
- hz = spi->max_speed_hz;
-
cs->rx_shift = 0;
cs->tx_shift = 0;
if (bits_per_word <= 8) {
@@ -340,19 +315,82 @@ int mpc8xxx_spi_setup_transfer(struct spi_device *spi, struct spi_transfer *t)
return -EINVAL;
if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE &&
- spi->mode & SPI_LSB_FIRST) {
+ spi->mode & SPI_LSB_FIRST) {
cs->tx_shift = 0;
if (bits_per_word <= 8)
cs->rx_shift = 8;
else
cs->rx_shift = 0;
}
-
mpc8xxx_spi->rx_shift = cs->rx_shift;
mpc8xxx_spi->tx_shift = cs->tx_shift;
mpc8xxx_spi->get_rx = cs->get_rx;
mpc8xxx_spi->get_tx = cs->get_tx;
+ return bits_per_word;
+}
+
+static int
+mspi_apply_qe_mode_quirks(struct spi_mpc8xxx_cs *cs,
+ struct spi_device *spi,
+ int bits_per_word)
+{
+ /* QE uses Little Endian for words > 8
+ * so transform all words > 8 into 8 bits
+ * Unfortnatly that doesn't work for LSB so
+ * reject these for now */
+ /* Note: 32 bits word, LSB works iff
+ * tfcr/rfcr is set to CPMFCR_GBL */
+ if (spi->mode & SPI_LSB_FIRST &&
+ bits_per_word > 8)
+ return -EINVAL;
+ if (bits_per_word > 8)
+ return 8; /* pretend its 8 bits */
+ return bits_per_word;
+}
+
+static
+int mpc8xxx_spi_setup_transfer(struct spi_device *spi, struct spi_transfer *t)
+{
+ struct mpc8xxx_spi *mpc8xxx_spi;
+ int bits_per_word;
+ u8 pm;
+ u32 hz;
+ struct spi_mpc8xxx_cs *cs = spi->controller_state;
+
+ mpc8xxx_spi = spi_master_get_devdata(spi->master);
+
+ if (t) {
+ bits_per_word = t->bits_per_word;
+ hz = t->speed_hz;
+ } else {
+ bits_per_word = 0;
+ hz = 0;
+ }
+
+ /* spi_transfer level calls that work per-word */
+ if (!bits_per_word)
+ bits_per_word = spi->bits_per_word;
+
+ /* Make sure its a bit width we support [4..16, 32] */
+ if ((bits_per_word < 4)
+ || ((bits_per_word > 16) && (bits_per_word != 32)))
+ return -EINVAL;
+
+ if (!hz)
+ hz = spi->max_speed_hz;
+
+ if (!(mpc8xxx_spi->flags & SPI_CPM_MODE))
+ bits_per_word = mspi_apply_cpu_mode_quirks(cs, spi,
+ mpc8xxx_spi,
+ bits_per_word);
+ else if (mpc8xxx_spi->flags & SPI_QE)
+ bits_per_word = mspi_apply_qe_mode_quirks(cs, spi,
+ bits_per_word);
+
+ if (bits_per_word < 0)
+ return bits_per_word;
+
if (bits_per_word == 32)
bits_per_word = 0;
else
@@ -438,7 +476,7 @@ static int mpc8xxx_spi_cpm_bufs(struct mpc8xxx_spi *mspi,
dev_err(dev, "unable to map tx dma\n");
return -ENOMEM;
}
- } else {
+ } else if (t->tx_buf) {
mspi->tx_dma = t->tx_dma;
}
@@ -449,7 +487,7 @@ static int mpc8xxx_spi_cpm_bufs(struct mpc8xxx_spi *mspi,
dev_err(dev, "unable to map rx dma\n");
goto err_rx_dma;
}
- } else {
+ } else if (t->rx_buf) {
mspi->rx_dma = t->rx_dma;
}
@@ -477,7 +515,7 @@ static void mpc8xxx_spi_cpm_bufs_complete(struct mpc8xxx_spi *mspi)
if (mspi->map_tx_dma)
dma_unmap_single(dev, mspi->tx_dma, t->len, DMA_TO_DEVICE);
- if (mspi->map_tx_dma)
+ if (mspi->map_rx_dma)
dma_unmap_single(dev, mspi->rx_dma, t->len, DMA_FROM_DEVICE);
mspi->xfer_in_progress = NULL;
}
@@ -797,7 +835,7 @@ static void mpc8xxx_spi_free_dummy_rx(void)
static unsigned long mpc8xxx_spi_cpm_get_pram(struct mpc8xxx_spi *mspi)
{
struct device *dev = mspi->dev;
- struct device_node *np = dev_archdata_get_node(&dev->archdata);
+ struct device_node *np = dev->of_node;
const u32 *iprop;
int size;
unsigned long spi_base_ofs;
@@ -851,7 +889,7 @@ static unsigned long mpc8xxx_spi_cpm_get_pram(struct mpc8xxx_spi *mspi)
static int mpc8xxx_spi_cpm_init(struct mpc8xxx_spi *mspi)
{
struct device *dev = mspi->dev;
- struct device_node *np = dev_archdata_get_node(&dev->archdata);
+ struct device_node *np = dev->of_node;
const u32 *iprop;
int size;
unsigned long pram_ofs;
@@ -1123,7 +1161,7 @@ static void mpc8xxx_spi_cs_control(struct spi_device *spi, bool on)
static int of_mpc8xxx_spi_get_chipselects(struct device *dev)
{
- struct device_node *np = dev_archdata_get_node(&dev->archdata);
+ struct device_node *np = dev->of_node;
struct fsl_spi_platform_data *pdata = dev->platform_data;
struct mpc8xxx_spi_probe_info *pinfo = to_of_pinfo(pdata);
unsigned int ngpios;
@@ -1224,7 +1262,7 @@ static int __devinit of_mpc8xxx_spi_probe(struct of_device *ofdev,
const struct of_device_id *ofid)
{
struct device *dev = &ofdev->dev;
- struct device_node *np = ofdev->node;
+ struct device_node *np = ofdev->dev.of_node;
struct mpc8xxx_spi_probe_info *pinfo;
struct fsl_spi_platform_data *pdata;
struct spi_master *master;
@@ -1312,8 +1350,11 @@ static const struct of_device_id of_mpc8xxx_spi_match[] = {
MODULE_DEVICE_TABLE(of, of_mpc8xxx_spi_match);
static struct of_platform_driver of_mpc8xxx_spi_driver = {
- .name = "mpc8xxx_spi",
- .match_table = of_mpc8xxx_spi_match,
+ .driver = {
+ .name = "mpc8xxx_spi",
+ .owner = THIS_MODULE,
+ .of_match_table = of_mpc8xxx_spi_match,
+ },
.probe = of_mpc8xxx_spi_probe,
.remove = __devexit_p(of_mpc8xxx_spi_remove),
};
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-20 00:23:42 +0000