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spi: bcm2835aux: unifying code between polling and interrupt driven code

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[ Upstream commit 7188a6f0eee3f1fae5d826cfc6d569657ff950ec ]

Sharing more code between polling and interrupt-driven mode.

Signed-off-by: Martin Sperl <kernel@martin.sperl.org>
Acked-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Martin Sperl 2019-03-30 09:30:58 +00:00 • committed by Greg Kroah-Hartman
parent c99ad4f20c
commit 5473cd1dbf
1 changed files with 18 additions and 33 deletions
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51
drivers/spi/spi-bcm2835aux.c
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@ -181,23 +181,13 @@ static void bcm2835aux_spi_reset_hw(struct bcm2835aux_spi *bs)
BCM2835_AUX_SPI_CNTL0_CLEARFIFO);
}
static irqreturn_t bcm2835aux_spi_interrupt(int irq, void *dev_id)
static void bcm2835aux_spi_transfer_helper(struct bcm2835aux_spi *bs)
{
struct spi_master *master = dev_id;
struct bcm2835aux_spi *bs = spi_master_get_devdata(master);
irqreturn_t ret = IRQ_NONE;
/* IRQ may be shared, so return if our interrupts are disabled */
if (!(bcm2835aux_rd(bs, BCM2835_AUX_SPI_CNTL1) &
(BCM2835_AUX_SPI_CNTL1_TXEMPTY | BCM2835_AUX_SPI_CNTL1_IDLE)))
return ret;
/* check if we have data to read */
while (bs->rx_len &&
(!(bcm2835aux_rd(bs, BCM2835_AUX_SPI_STAT) &
BCM2835_AUX_SPI_STAT_RX_EMPTY))) {
bcm2835aux_rd_fifo(bs);
ret = IRQ_HANDLED;
}
/* check if we have data to write */
@ -206,7 +196,6 @@ static irqreturn_t bcm2835aux_spi_interrupt(int irq, void *dev_id)
(!(bcm2835aux_rd(bs, BCM2835_AUX_SPI_STAT) &
BCM2835_AUX_SPI_STAT_TX_FULL))) {
bcm2835aux_wr_fifo(bs);
ret = IRQ_HANDLED;
}
/* and check if we have reached "done" */
@ -214,8 +203,21 @@ static irqreturn_t bcm2835aux_spi_interrupt(int irq, void *dev_id)
(!(bcm2835aux_rd(bs, BCM2835_AUX_SPI_STAT) &
BCM2835_AUX_SPI_STAT_BUSY))) {
bcm2835aux_rd_fifo(bs);
ret = IRQ_HANDLED;
}
}
static irqreturn_t bcm2835aux_spi_interrupt(int irq, void *dev_id)
{
struct spi_master *master = dev_id;
struct bcm2835aux_spi *bs = spi_master_get_devdata(master);
/* IRQ may be shared, so return if our interrupts are disabled */
if (!(bcm2835aux_rd(bs, BCM2835_AUX_SPI_CNTL1) &
(BCM2835_AUX_SPI_CNTL1_TXEMPTY | BCM2835_AUX_SPI_CNTL1_IDLE)))
return IRQ_NONE;
/* do common fifo handling */
bcm2835aux_spi_transfer_helper(bs);
/* and if rx_len is 0 then wake up completion and disable spi */
if (!bs->rx_len) {
@ -223,8 +225,7 @@ static irqreturn_t bcm2835aux_spi_interrupt(int irq, void *dev_id)
complete(&master->xfer_completion);
}
/* and return */
return ret;
return IRQ_HANDLED;
}
static int __bcm2835aux_spi_transfer_one_irq(struct spi_master *master,
@ -270,7 +271,6 @@ static int bcm2835aux_spi_transfer_one_poll(struct spi_master *master,
{
struct bcm2835aux_spi *bs = spi_master_get_devdata(master);
unsigned long timeout;
u32 stat;
/* configure spi */
bcm2835aux_wr(bs, BCM2835_AUX_SPI_CNTL1, bs->cntl[1]);
@ -281,24 +281,9 @@ static int bcm2835aux_spi_transfer_one_poll(struct spi_master *master,
/* loop until finished the transfer */
while (bs->rx_len) {
/* read status */
stat = bcm2835aux_rd(bs, BCM2835_AUX_SPI_STAT);
/* fill in tx fifo with remaining data */
if ((bs->tx_len) && (!(stat & BCM2835_AUX_SPI_STAT_TX_FULL))) {
bcm2835aux_wr_fifo(bs);
continue;
}
/* read data from fifo for both cases */
if (!(stat & BCM2835_AUX_SPI_STAT_RX_EMPTY)) {
bcm2835aux_rd_fifo(bs);
continue;
}
if (!(stat & BCM2835_AUX_SPI_STAT_BUSY)) {
bcm2835aux_rd_fifo(bs);
continue;
}
/* do common fifo handling */
bcm2835aux_spi_transfer_helper(bs);
/* there is still data pending to read check the timeout */
if (bs->rx_len && time_after(jiffies, timeout)) {