summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorDilip Kota <eswara.kota@linux.intel.com>2020-07-17 09:27:53 +0300
committerMark Brown <broonie@kernel.org>2020-07-22 03:55:56 +0300
commit94eca904cb97f9cfa90e3e558fb73c49d2e42f91 (patch)
tree9b0eb0f3b701f291e9a8091e4cf2cf46f4920791
parent8d19d665e0aca28c4bd8a024241b05f74841a315 (diff)
downloadlinux-94eca904cb97f9cfa90e3e558fb73c49d2e42f91.tar.xz
spi: lantiq: Add support to acknowledge interrupt
On newer chipsets interrupt need to be acknowledged as they use different interrupt controller which does not acknowledge the interrupts automatically. Signed-off-by: Dilip Kota <eswara.kota@linux.intel.com> Link: https://lore.kernel.org/r/608923b484d9ef239b44bb545c0b79b27030a6ae.1594957019.git.eswara.kota@linux.intel.com Signed-off-by: Mark Brown <broonie@kernel.org>
-rw-r--r--drivers/spi/spi-lantiq-ssc.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/spi/spi-lantiq-ssc.c b/drivers/spi/spi-lantiq-ssc.c
index 78c6b131d069..aa984e704b05 100644
--- a/drivers/spi/spi-lantiq-ssc.c
+++ b/drivers/spi/spi-lantiq-ssc.c
@@ -160,6 +160,7 @@ struct lantiq_ssc_hwcfg {
unsigned int irnen_t;
unsigned int irncr;
unsigned int irnicr;
+ bool irq_ack;
};
struct lantiq_ssc_spi {
@@ -622,9 +623,14 @@ static void rx_request(struct lantiq_ssc_spi *spi)
static irqreturn_t lantiq_ssc_xmit_interrupt(int irq, void *data)
{
struct lantiq_ssc_spi *spi = data;
+ const struct lantiq_ssc_hwcfg *hwcfg = spi->hwcfg;
+ u32 val = lantiq_ssc_readl(spi, hwcfg->irncr);
unsigned long flags;
spin_lock_irqsave(&spi->lock, flags);
+ if (hwcfg->irq_ack)
+ lantiq_ssc_writel(spi, val, hwcfg->irncr);
+
if (spi->tx) {
if (spi->rx && spi->rx_todo)
rx_fifo_read_full_duplex(spi);
@@ -659,13 +665,18 @@ completed:
static irqreturn_t lantiq_ssc_err_interrupt(int irq, void *data)
{
struct lantiq_ssc_spi *spi = data;
+ const struct lantiq_ssc_hwcfg *hwcfg = spi->hwcfg;
u32 stat = lantiq_ssc_readl(spi, LTQ_SPI_STAT);
+ u32 val = lantiq_ssc_readl(spi, hwcfg->irncr);
unsigned long flags;
if (!(stat & LTQ_SPI_STAT_ERRORS))
return IRQ_NONE;
spin_lock_irqsave(&spi->lock, flags);
+ if (hwcfg->irq_ack)
+ lantiq_ssc_writel(spi, val, hwcfg->irncr);
+
if (stat & LTQ_SPI_STAT_RUE)
dev_err(spi->dev, "receive underflow error\n");
if (stat & LTQ_SPI_STAT_TUE)
@@ -796,6 +807,7 @@ static const struct lantiq_ssc_hwcfg lantiq_ssc_xway = {
.irnen_t = LTQ_SPI_IRNEN_T_XWAY,
.irnicr = 0xF8,
.irncr = 0xFC,
+ .irq_ack = false,
};
static const struct lantiq_ssc_hwcfg lantiq_ssc_xrx = {
@@ -803,6 +815,7 @@ static const struct lantiq_ssc_hwcfg lantiq_ssc_xrx = {
.irnen_t = LTQ_SPI_IRNEN_T_XRX,
.irnicr = 0xF8,
.irncr = 0xFC,
+ .irq_ack = false,
};
static const struct of_device_id lantiq_ssc_match[] = {