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path: root/drivers/spi/omap2_mcspi.c
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Diffstat (limited to 'drivers/spi/omap2_mcspi.c')
-rw-r--r--drivers/spi/omap2_mcspi.c153
1 files changed, 123 insertions, 30 deletions
diff --git a/drivers/spi/omap2_mcspi.c b/drivers/spi/omap2_mcspi.c
index e0de0d0..b3a94ca 100644
--- a/drivers/spi/omap2_mcspi.c
+++ b/drivers/spi/omap2_mcspi.c
@@ -38,7 +38,7 @@
#include <plat/dma.h>
#include <plat/clock.h>
-
+#include <plat/mcspi.h>
#define OMAP2_MCSPI_MAX_FREQ 48000000
@@ -113,7 +113,7 @@ struct omap2_mcspi_dma {
/* use PIO for small transfers, avoiding DMA setup/teardown overhead and
* cache operations; better heuristics consider wordsize and bitrate.
*/
-#define DMA_MIN_BYTES 8
+#define DMA_MIN_BYTES 160
struct omap2_mcspi {
@@ -229,6 +229,8 @@ static void omap2_mcspi_set_enable(const struct spi_device *spi, int enable)
l = enable ? OMAP2_MCSPI_CHCTRL_EN : 0;
mcspi_write_cs_reg(spi, OMAP2_MCSPI_CHCTRL0, l);
+ /* Flash post-writes */
+ mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHCTRL0);
}
static void omap2_mcspi_force_cs(struct spi_device *spi, int cs_active)
@@ -303,11 +305,14 @@ omap2_mcspi_txrx_dma(struct spi_device *spi, struct spi_transfer *xfer)
unsigned int count, c;
unsigned long base, tx_reg, rx_reg;
int word_len, data_type, element_count;
+ int elements;
+ u32 l;
u8 * rx;
const u8 * tx;
mcspi = spi_master_get_devdata(spi->master);
mcspi_dma = &mcspi->dma_channels[spi->chip_select];
+ l = mcspi_cached_chconf0(spi);
count = xfer->len;
c = count;
@@ -346,8 +351,12 @@ omap2_mcspi_txrx_dma(struct spi_device *spi, struct spi_transfer *xfer)
}
if (rx != NULL) {
+ elements = element_count - 1;
+ if (l & OMAP2_MCSPI_CHCONF_TURBO)
+ elements--;
+
omap_set_dma_transfer_params(mcspi_dma->dma_rx_channel,
- data_type, element_count - 1, 1,
+ data_type, elements, 1,
OMAP_DMA_SYNC_ELEMENT,
mcspi_dma->dma_rx_sync_dev, 1);
@@ -379,17 +388,42 @@ omap2_mcspi_txrx_dma(struct spi_device *spi, struct spi_transfer *xfer)
wait_for_completion(&mcspi_dma->dma_rx_completion);
dma_unmap_single(NULL, xfer->rx_dma, count, DMA_FROM_DEVICE);
omap2_mcspi_set_enable(spi, 0);
+
+ if (l & OMAP2_MCSPI_CHCONF_TURBO) {
+
+ if (likely(mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHSTAT0)
+ & OMAP2_MCSPI_CHSTAT_RXS)) {
+ u32 w;
+
+ w = mcspi_read_cs_reg(spi, OMAP2_MCSPI_RX0);
+ if (word_len <= 8)
+ ((u8 *)xfer->rx_buf)[elements++] = w;
+ else if (word_len <= 16)
+ ((u16 *)xfer->rx_buf)[elements++] = w;
+ else /* word_len <= 32 */
+ ((u32 *)xfer->rx_buf)[elements++] = w;
+ } else {
+ dev_err(&spi->dev,
+ "DMA RX penultimate word empty");
+ count -= (word_len <= 8) ? 2 :
+ (word_len <= 16) ? 4 :
+ /* word_len <= 32 */ 8;
+ omap2_mcspi_set_enable(spi, 1);
+ return count;
+ }
+ }
+
if (likely(mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHSTAT0)
& OMAP2_MCSPI_CHSTAT_RXS)) {
u32 w;
w = mcspi_read_cs_reg(spi, OMAP2_MCSPI_RX0);
if (word_len <= 8)
- ((u8 *)xfer->rx_buf)[element_count - 1] = w;
+ ((u8 *)xfer->rx_buf)[elements] = w;
else if (word_len <= 16)
- ((u16 *)xfer->rx_buf)[element_count - 1] = w;
+ ((u16 *)xfer->rx_buf)[elements] = w;
else /* word_len <= 32 */
- ((u32 *)xfer->rx_buf)[element_count - 1] = w;
+ ((u32 *)xfer->rx_buf)[elements] = w;
} else {
dev_err(&spi->dev, "DMA RX last word empty");
count -= (word_len <= 8) ? 1 :
@@ -433,7 +467,6 @@ omap2_mcspi_txrx_pio(struct spi_device *spi, struct spi_transfer *xfer)
word_len = cs->word_len;
l = mcspi_cached_chconf0(spi);
- l &= ~OMAP2_MCSPI_CHCONF_TRM_MASK;
/* We store the pre-calculated register addresses on stack to speed
* up the transfer loop. */
@@ -468,11 +501,26 @@ omap2_mcspi_txrx_pio(struct spi_device *spi, struct spi_transfer *xfer)
dev_err(&spi->dev, "RXS timed out\n");
goto out;
}
- /* prevent last RX_ONLY read from triggering
- * more word i/o: switch to rx+tx
- */
- if (c == 0 && tx == NULL)
- mcspi_write_chconf0(spi, l);
+
+ if (c == 1 && tx == NULL &&
+ (l & OMAP2_MCSPI_CHCONF_TURBO)) {
+ omap2_mcspi_set_enable(spi, 0);
+ *rx++ = __raw_readl(rx_reg);
+#ifdef VERBOSE
+ dev_dbg(&spi->dev, "read-%d %02x\n",
+ word_len, *(rx - 1));
+#endif
+ if (mcspi_wait_for_reg_bit(chstat_reg,
+ OMAP2_MCSPI_CHSTAT_RXS) < 0) {
+ dev_err(&spi->dev,
+ "RXS timed out\n");
+ goto out;
+ }
+ c = 0;
+ } else if (c == 0 && tx == NULL) {
+ omap2_mcspi_set_enable(spi, 0);
+ }
+
*rx++ = __raw_readl(rx_reg);
#ifdef VERBOSE
dev_dbg(&spi->dev, "read-%d %02x\n",
@@ -506,11 +554,26 @@ omap2_mcspi_txrx_pio(struct spi_device *spi, struct spi_transfer *xfer)
dev_err(&spi->dev, "RXS timed out\n");
goto out;
}
- /* prevent last RX_ONLY read from triggering
- * more word i/o: switch to rx+tx
- */
- if (c == 0 && tx == NULL)
- mcspi_write_chconf0(spi, l);
+
+ if (c == 2 && tx == NULL &&
+ (l & OMAP2_MCSPI_CHCONF_TURBO)) {
+ omap2_mcspi_set_enable(spi, 0);
+ *rx++ = __raw_readl(rx_reg);
+#ifdef VERBOSE
+ dev_dbg(&spi->dev, "read-%d %04x\n",
+ word_len, *(rx - 1));
+#endif
+ if (mcspi_wait_for_reg_bit(chstat_reg,
+ OMAP2_MCSPI_CHSTAT_RXS) < 0) {
+ dev_err(&spi->dev,
+ "RXS timed out\n");
+ goto out;
+ }
+ c = 0;
+ } else if (c == 0 && tx == NULL) {
+ omap2_mcspi_set_enable(spi, 0);
+ }
+
*rx++ = __raw_readl(rx_reg);
#ifdef VERBOSE
dev_dbg(&spi->dev, "read-%d %04x\n",
@@ -544,11 +607,26 @@ omap2_mcspi_txrx_pio(struct spi_device *spi, struct spi_transfer *xfer)
dev_err(&spi->dev, "RXS timed out\n");
goto out;
}
- /* prevent last RX_ONLY read from triggering
- * more word i/o: switch to rx+tx
- */
- if (c == 0 && tx == NULL)
- mcspi_write_chconf0(spi, l);
+
+ if (c == 4 && tx == NULL &&
+ (l & OMAP2_MCSPI_CHCONF_TURBO)) {
+ omap2_mcspi_set_enable(spi, 0);
+ *rx++ = __raw_readl(rx_reg);
+#ifdef VERBOSE
+ dev_dbg(&spi->dev, "read-%d %08x\n",
+ word_len, *(rx - 1));
+#endif
+ if (mcspi_wait_for_reg_bit(chstat_reg,
+ OMAP2_MCSPI_CHSTAT_RXS) < 0) {
+ dev_err(&spi->dev,
+ "RXS timed out\n");
+ goto out;
+ }
+ c = 0;
+ } else if (c == 0 && tx == NULL) {
+ omap2_mcspi_set_enable(spi, 0);
+ }
+
*rx++ = __raw_readl(rx_reg);
#ifdef VERBOSE
dev_dbg(&spi->dev, "read-%d %08x\n",
@@ -568,6 +646,7 @@ omap2_mcspi_txrx_pio(struct spi_device *spi, struct spi_transfer *xfer)
dev_err(&spi->dev, "EOT timed out\n");
}
out:
+ omap2_mcspi_set_enable(spi, 1);
return count - c;
}
@@ -755,7 +834,6 @@ static void omap2_mcspi_cleanup(struct spi_device *spi)
struct omap2_mcspi_cs *cs;
mcspi = spi_master_get_devdata(spi->master);
- mcspi_dma = &mcspi->dma_channels[spi->chip_select];
if (spi->controller_state) {
/* Unlink controller state from context save list */
@@ -765,13 +843,17 @@ static void omap2_mcspi_cleanup(struct spi_device *spi)
kfree(spi->controller_state);
}
- if (mcspi_dma->dma_rx_channel != -1) {
- omap_free_dma(mcspi_dma->dma_rx_channel);
- mcspi_dma->dma_rx_channel = -1;
- }
- if (mcspi_dma->dma_tx_channel != -1) {
- omap_free_dma(mcspi_dma->dma_tx_channel);
- mcspi_dma->dma_tx_channel = -1;
+ if (spi->chip_select < spi->master->num_chipselect) {
+ mcspi_dma = &mcspi->dma_channels[spi->chip_select];
+
+ if (mcspi_dma->dma_rx_channel != -1) {
+ omap_free_dma(mcspi_dma->dma_rx_channel);
+ mcspi_dma->dma_rx_channel = -1;
+ }
+ if (mcspi_dma->dma_tx_channel != -1) {
+ omap_free_dma(mcspi_dma->dma_tx_channel);
+ mcspi_dma->dma_tx_channel = -1;
+ }
}
}
@@ -797,6 +879,7 @@ static void omap2_mcspi_work(struct work_struct *work)
struct spi_transfer *t = NULL;
int cs_active = 0;
struct omap2_mcspi_cs *cs;
+ struct omap2_mcspi_device_config *cd;
int par_override = 0;
int status = 0;
u32 chconf;
@@ -809,6 +892,7 @@ static void omap2_mcspi_work(struct work_struct *work)
spi = m->spi;
cs = spi->controller_state;
+ cd = spi->controller_data;
omap2_mcspi_set_enable(spi, 1);
list_for_each_entry(t, &m->transfers, transfer_list) {
@@ -832,10 +916,19 @@ static void omap2_mcspi_work(struct work_struct *work)
chconf = mcspi_cached_chconf0(spi);
chconf &= ~OMAP2_MCSPI_CHCONF_TRM_MASK;
+ chconf &= ~OMAP2_MCSPI_CHCONF_TURBO;
+
if (t->tx_buf == NULL)
chconf |= OMAP2_MCSPI_CHCONF_TRM_RX_ONLY;
else if (t->rx_buf == NULL)
chconf |= OMAP2_MCSPI_CHCONF_TRM_TX_ONLY;
+
+ if (cd && cd->turbo_mode && t->tx_buf == NULL) {
+ /* Turbo mode is for more than one word */
+ if (t->len > ((cs->word_len + 7) >> 3))
+ chconf |= OMAP2_MCSPI_CHCONF_TURBO;
+ }
+
mcspi_write_chconf0(spi, chconf);
if (t->len) {
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