spi: spi_bfin handles spi_transfer.cs_change
Respect per-transfer cs_change field (protocol tweaking support) by adding and using cs_active/cs_deactive functions. Signed-off-by: Bryan Wu <bryan.wu@analog.com> Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -115,6 +115,7 @@ struct driver_data {
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size_t rx_map_len;
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size_t tx_map_len;
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u8 n_bytes;
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int cs_change;
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void (*write) (struct driver_data *);
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void (*read) (struct driver_data *);
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void (*duplex) (struct driver_data *);
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@ -179,6 +180,26 @@ static int flush(struct driver_data *drv_data)
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return limit;
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}
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/* Chip select operation functions for cs_change flag */
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static void cs_active(struct chip_data *chip)
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{
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u16 flag = read_FLAG();
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flag |= chip->flag;
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flag &= ~(chip->flag << 8);
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write_FLAG(flag);
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}
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static void cs_deactive(struct chip_data *chip)
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{
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u16 flag = read_FLAG();
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flag |= (chip->flag << 8);
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write_FLAG(flag);
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}
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#define MAX_SPI0_SSEL 7
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/* stop controller and re-config current chip*/
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@ -198,7 +219,7 @@ static int restore_state(struct driver_data *drv_data)
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/* Load the registers */
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write_CTRL(chip->ctl_reg);
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write_BAUD(chip->baud);
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write_FLAG(chip->flag);
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cs_active(chip);
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if (!chip->chip_select_requested) {
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int i = chip->chip_select_num;
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@ -273,20 +294,20 @@ static void u8_cs_chg_writer(struct driver_data *drv_data)
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struct chip_data *chip = drv_data->cur_chip;
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while (drv_data->tx < drv_data->tx_end) {
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write_FLAG(chip->flag);
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cs_active(chip);
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write_TDBR(*(u8 *) (drv_data->tx));
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while (read_STAT() & BIT_STAT_TXS)
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continue;
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while (!(read_STAT() & BIT_STAT_SPIF))
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continue;
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write_FLAG(0xFF00 | chip->flag);
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cs_deactive(chip);
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if (chip->cs_chg_udelay)
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udelay(chip->cs_chg_udelay);
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++drv_data->tx;
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}
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write_FLAG(0xFF00);
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cs_deactive(chip);
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}
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@ -318,7 +339,7 @@ static void u8_cs_chg_reader(struct driver_data *drv_data)
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struct chip_data *chip = drv_data->cur_chip;
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while (drv_data->rx < drv_data->rx_end) {
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write_FLAG(chip->flag);
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cs_active(chip);
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read_RDBR(); /* kick off */
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while (!(read_STAT() & BIT_STAT_RXS))
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@ -326,13 +347,13 @@ static void u8_cs_chg_reader(struct driver_data *drv_data)
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while (!(read_STAT() & BIT_STAT_SPIF))
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continue;
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*(u8 *) (drv_data->rx) = read_SHAW();
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write_FLAG(0xFF00 | chip->flag);
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cs_deactive(chip);
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if (chip->cs_chg_udelay)
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udelay(chip->cs_chg_udelay);
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++drv_data->rx;
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}
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write_FLAG(0xFF00);
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cs_deactive(chip);
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}
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@ -356,7 +377,7 @@ static void u8_cs_chg_duplex(struct driver_data *drv_data)
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struct chip_data *chip = drv_data->cur_chip;
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while (drv_data->rx < drv_data->rx_end) {
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write_FLAG(chip->flag);
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cs_active(chip);
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write_TDBR(*(u8 *) (drv_data->tx));
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@ -365,15 +386,14 @@ static void u8_cs_chg_duplex(struct driver_data *drv_data)
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while (!(read_STAT() & BIT_STAT_RXS))
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continue;
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*(u8 *) (drv_data->rx) = read_RDBR();
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write_FLAG(0xFF00 | chip->flag);
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cs_deactive(chip);
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if (chip->cs_chg_udelay)
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udelay(chip->cs_chg_udelay);
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++drv_data->rx;
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++drv_data->tx;
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}
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write_FLAG(0xFF00);
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cs_deactive(chip);
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}
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static void u16_writer(struct driver_data *drv_data)
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@ -398,20 +418,20 @@ static void u16_cs_chg_writer(struct driver_data *drv_data)
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struct chip_data *chip = drv_data->cur_chip;
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while (drv_data->tx < drv_data->tx_end) {
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write_FLAG(chip->flag);
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cs_active(chip);
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write_TDBR(*(u16 *) (drv_data->tx));
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while ((read_STAT() & BIT_STAT_TXS))
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continue;
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while (!(read_STAT() & BIT_STAT_SPIF))
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continue;
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write_FLAG(0xFF00 | chip->flag);
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cs_deactive(chip);
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if (chip->cs_chg_udelay)
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udelay(chip->cs_chg_udelay);
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drv_data->tx += 2;
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}
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write_FLAG(0xFF00);
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cs_deactive(chip);
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}
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static void u16_reader(struct driver_data *drv_data)
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@ -438,7 +458,7 @@ static void u16_cs_chg_reader(struct driver_data *drv_data)
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struct chip_data *chip = drv_data->cur_chip;
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while (drv_data->rx < drv_data->rx_end) {
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write_FLAG(chip->flag);
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cs_active(chip);
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read_RDBR(); /* kick off */
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while (!(read_STAT() & BIT_STAT_RXS))
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@ -446,13 +466,13 @@ static void u16_cs_chg_reader(struct driver_data *drv_data)
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while (!(read_STAT() & BIT_STAT_SPIF))
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continue;
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*(u16 *) (drv_data->rx) = read_SHAW();
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write_FLAG(0xFF00 | chip->flag);
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cs_deactive(chip);
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if (chip->cs_chg_udelay)
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udelay(chip->cs_chg_udelay);
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drv_data->rx += 2;
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}
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write_FLAG(0xFF00);
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cs_deactive(chip);
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}
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static void u16_duplex(struct driver_data *drv_data)
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@ -475,7 +495,7 @@ static void u16_cs_chg_duplex(struct driver_data *drv_data)
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struct chip_data *chip = drv_data->cur_chip;
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while (drv_data->tx < drv_data->tx_end) {
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write_FLAG(chip->flag);
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cs_active(chip);
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write_TDBR(*(u16 *) (drv_data->tx));
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while (!(read_STAT() & BIT_STAT_SPIF))
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@ -483,14 +503,14 @@ static void u16_cs_chg_duplex(struct driver_data *drv_data)
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while (!(read_STAT() & BIT_STAT_RXS))
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continue;
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*(u16 *) (drv_data->rx) = read_RDBR();
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write_FLAG(0xFF00 | chip->flag);
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cs_deactive(chip);
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if (chip->cs_chg_udelay)
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udelay(chip->cs_chg_udelay);
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drv_data->rx += 2;
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drv_data->tx += 2;
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}
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write_FLAG(0xFF00);
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cs_deactive(chip);
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}
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/* test if ther is more transfer to be done */
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@ -515,6 +535,7 @@ static void *next_transfer(struct driver_data *drv_data)
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*/
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static void giveback(struct driver_data *drv_data)
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{
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struct chip_data *chip = drv_data->cur_chip;
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struct spi_transfer *last_transfer;
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unsigned long flags;
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struct spi_message *msg;
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@ -534,10 +555,13 @@ static void giveback(struct driver_data *drv_data)
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/* disable chip select signal. And not stop spi in autobuffer mode */
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if (drv_data->tx_dma != 0xFFFF) {
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write_FLAG(0xFF00);
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cs_deactive(chip);
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bfin_spi_disable(drv_data);
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}
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if (!drv_data->cs_change)
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cs_deactive(chip);
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if (msg->complete)
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msg->complete(msg->context);
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}
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@ -546,6 +570,7 @@ static irqreturn_t dma_irq_handler(int irq, void *dev_id)
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{
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struct driver_data *drv_data = (struct driver_data *)dev_id;
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struct spi_message *msg = drv_data->cur_msg;
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struct chip_data *chip = drv_data->cur_chip;
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dev_dbg(&drv_data->pdev->dev, "in dma_irq_handler\n");
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clear_dma_irqstat(CH_SPI);
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@ -573,6 +598,9 @@ static irqreturn_t dma_irq_handler(int irq, void *dev_id)
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msg->actual_length += drv_data->len_in_bytes;
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if (drv_data->cs_change)
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cs_deactive(chip);
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/* Move to next transfer */
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msg->state = next_transfer(drv_data);
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@ -659,6 +687,7 @@ static void pump_transfers(unsigned long data)
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drv_data->rx_dma = transfer->rx_dma;
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drv_data->tx_dma = transfer->tx_dma;
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drv_data->len_in_bytes = transfer->len;
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drv_data->cs_change = transfer->cs_change;
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width = chip->width;
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if (width == CFG_SPI_WORDSIZE16) {
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@ -683,7 +712,7 @@ static void pump_transfers(unsigned long data)
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} else {
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write_BAUD(chip->baud);
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}
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write_FLAG(chip->flag);
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cs_active(chip);
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dev_dbg(&drv_data->pdev->dev,
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"now pumping a transfer: width is %d, len is %d\n",
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@ -834,6 +863,9 @@ static void pump_transfers(unsigned long data)
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/* Update total byte transfered */
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message->actual_length += drv_data->len;
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if (drv_data->cs_change)
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cs_deactive(chip);
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/* Move to next transfer of this msg */
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message->state = next_transfer(drv_data);
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}
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