diff options
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/spi_bfin5xx.c | 84 |
1 files changed, 52 insertions, 32 deletions
diff --git a/drivers/spi/spi_bfin5xx.c b/drivers/spi/spi_bfin5xx.c index c99a2afabf0c..c7cfd95fa8ec 100644 --- a/drivers/spi/spi_bfin5xx.c +++ b/drivers/spi/spi_bfin5xx.c @@ -276,22 +276,26 @@ static void u8_writer(struct driver_data *drv_data) dev_dbg(&drv_data->pdev->dev, "cr8-s is 0x%x\n", read_STAT()); + /* poll for SPI completion before start */ + while (!(read_STAT() & BIT_STAT_SPIF)) + continue; + while (drv_data->tx < drv_data->tx_end) { write_TDBR(*(u8 *) (drv_data->tx)); while (read_STAT() & BIT_STAT_TXS) continue; ++drv_data->tx; } - - /* poll for SPI completion before returning */ - while (!(read_STAT() & BIT_STAT_SPIF)) - continue; } static void u8_cs_chg_writer(struct driver_data *drv_data) { struct chip_data *chip = drv_data->cur_chip; + /* poll for SPI completion before start */ + while (!(read_STAT() & BIT_STAT_SPIF)) + continue; + while (drv_data->tx < drv_data->tx_end) { cs_active(chip); @@ -304,10 +308,6 @@ static void u8_cs_chg_writer(struct driver_data *drv_data) udelay(chip->cs_chg_udelay); ++drv_data->tx; } - - /* poll for SPI completion before returning */ - while (!(read_STAT() & BIT_STAT_SPIF)) - continue; } static void u8_reader(struct driver_data *drv_data) @@ -315,6 +315,10 @@ static void u8_reader(struct driver_data *drv_data) dev_dbg(&drv_data->pdev->dev, "cr-8 is 0x%x\n", read_STAT()); + /* poll for SPI completion before start */ + while (!(read_STAT() & BIT_STAT_SPIF)) + continue; + /* clear TDBR buffer before read(else it will be shifted out) */ write_TDBR(0xFFFF); @@ -337,6 +341,10 @@ static void u8_cs_chg_reader(struct driver_data *drv_data) { struct chip_data *chip = drv_data->cur_chip; + /* poll for SPI completion before start */ + while (!(read_STAT() & BIT_STAT_SPIF)) + continue; + /* clear TDBR buffer before read(else it will be shifted out) */ write_TDBR(0xFFFF); @@ -365,6 +373,10 @@ static void u8_cs_chg_reader(struct driver_data *drv_data) static void u8_duplex(struct driver_data *drv_data) { + /* poll for SPI completion before start */ + while (!(read_STAT() & BIT_STAT_SPIF)) + continue; + /* in duplex mode, clk is triggered by writing of TDBR */ while (drv_data->rx < drv_data->rx_end) { write_TDBR(*(u8 *) (drv_data->tx)); @@ -376,16 +388,16 @@ static void u8_duplex(struct driver_data *drv_data) ++drv_data->rx; ++drv_data->tx; } - - /* poll for SPI completion before returning */ - while (!(read_STAT() & BIT_STAT_SPIF)) - continue; } static void u8_cs_chg_duplex(struct driver_data *drv_data) { struct chip_data *chip = drv_data->cur_chip; + /* poll for SPI completion before start */ + while (!(read_STAT() & BIT_STAT_SPIF)) + continue; + while (drv_data->rx < drv_data->rx_end) { cs_active(chip); @@ -402,10 +414,6 @@ static void u8_cs_chg_duplex(struct driver_data *drv_data) ++drv_data->rx; ++drv_data->tx; } - - /* poll for SPI completion before returning */ - while (!(read_STAT() & BIT_STAT_SPIF)) - continue; } static void u16_writer(struct driver_data *drv_data) @@ -413,22 +421,26 @@ static void u16_writer(struct driver_data *drv_data) dev_dbg(&drv_data->pdev->dev, "cr16 is 0x%x\n", read_STAT()); + /* poll for SPI completion before start */ + while (!(read_STAT() & BIT_STAT_SPIF)) + continue; + while (drv_data->tx < drv_data->tx_end) { write_TDBR(*(u16 *) (drv_data->tx)); while ((read_STAT() & BIT_STAT_TXS)) continue; drv_data->tx += 2; } - - /* poll for SPI completion before returning */ - while (!(read_STAT() & BIT_STAT_SPIF)) - continue; } static void u16_cs_chg_writer(struct driver_data *drv_data) { struct chip_data *chip = drv_data->cur_chip; + /* poll for SPI completion before start */ + while (!(read_STAT() & BIT_STAT_SPIF)) + continue; + while (drv_data->tx < drv_data->tx_end) { cs_active(chip); @@ -441,10 +453,6 @@ static void u16_cs_chg_writer(struct driver_data *drv_data) udelay(chip->cs_chg_udelay); drv_data->tx += 2; } - - /* poll for SPI completion before returning */ - while (!(read_STAT() & BIT_STAT_SPIF)) - continue; } static void u16_reader(struct driver_data *drv_data) @@ -452,6 +460,10 @@ static void u16_reader(struct driver_data *drv_data) dev_dbg(&drv_data->pdev->dev, "cr-16 is 0x%x\n", read_STAT()); + /* poll for SPI completion before start */ + while (!(read_STAT() & BIT_STAT_SPIF)) + continue; + /* clear TDBR buffer before read(else it will be shifted out) */ write_TDBR(0xFFFF); @@ -474,6 +486,10 @@ static void u16_cs_chg_reader(struct driver_data *drv_data) { struct chip_data *chip = drv_data->cur_chip; + /* poll for SPI completion before start */ + while (!(read_STAT() & BIT_STAT_SPIF)) + continue; + /* clear TDBR buffer before read(else it will be shifted out) */ write_TDBR(0xFFFF); @@ -502,6 +518,10 @@ static void u16_cs_chg_reader(struct driver_data *drv_data) static void u16_duplex(struct driver_data *drv_data) { + /* poll for SPI completion before start */ + while (!(read_STAT() & BIT_STAT_SPIF)) + continue; + /* in duplex mode, clk is triggered by writing of TDBR */ while (drv_data->tx < drv_data->tx_end) { write_TDBR(*(u16 *) (drv_data->tx)); @@ -513,16 +533,16 @@ static void u16_duplex(struct driver_data *drv_data) drv_data->rx += 2; drv_data->tx += 2; } - - /* poll for SPI completion before returning */ - while (!(read_STAT() & BIT_STAT_SPIF)) - continue; } static void u16_cs_chg_duplex(struct driver_data *drv_data) { struct chip_data *chip = drv_data->cur_chip; + /* poll for SPI completion before start */ + while (!(read_STAT() & BIT_STAT_SPIF)) + continue; + while (drv_data->tx < drv_data->tx_end) { cs_active(chip); @@ -539,10 +559,6 @@ static void u16_cs_chg_duplex(struct driver_data *drv_data) drv_data->rx += 2; drv_data->tx += 2; } - - /* poll for SPI completion before returning */ - while (!(read_STAT() & BIT_STAT_SPIF)) - continue; } /* test if ther is more transfer to be done */ @@ -765,6 +781,10 @@ static void pump_transfers(unsigned long data) dma_width = WDSIZE_8; } + /* poll for SPI completion before start */ + while (!(read_STAT() & BIT_STAT_SPIF)) + continue; + /* dirty hack for autobuffer DMA mode */ if (drv_data->tx_dma == 0xFFFF) { dev_dbg(&drv_data->pdev->dev, |