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spi: lantiq: Add support to acknowledge interrupt

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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>
This commit is contained in:
Dilip Kota
2020-07-17 14:27:53 +08:00
committed by Mark Brown
parent 8d19d665e0
commit 94eca904cb
1 changed files with 13 additions and 0 deletions
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13
drivers/spi/spi-lantiq-ssc.c
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@@ -160,6 +160,7 @@ struct lantiq_ssc_hwcfg {
unsigned int irnen_t; unsigned int irnen_t;
unsigned int irncr; unsigned int irncr;
unsigned int irnicr; unsigned int irnicr;
bool irq_ack;
}; };
struct lantiq_ssc_spi { 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) static irqreturn_t lantiq_ssc_xmit_interrupt(int irq, void *data)
{ {
struct lantiq_ssc_spi *spi = 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; unsigned long flags;
spin_lock_irqsave(&spi->lock, flags); spin_lock_irqsave(&spi->lock, flags);
if (hwcfg->irq_ack)
lantiq_ssc_writel(spi, val, hwcfg->irncr);
if (spi->tx) { if (spi->tx) {
if (spi->rx && spi->rx_todo) if (spi->rx && spi->rx_todo)
rx_fifo_read_full_duplex(spi); rx_fifo_read_full_duplex(spi);
@@ -659,13 +665,18 @@ completed:
static irqreturn_t lantiq_ssc_err_interrupt(int irq, void *data) static irqreturn_t lantiq_ssc_err_interrupt(int irq, void *data)
{ {
struct lantiq_ssc_spi *spi = 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 stat = lantiq_ssc_readl(spi, LTQ_SPI_STAT);
u32 val = lantiq_ssc_readl(spi, hwcfg->irncr);
unsigned long flags; unsigned long flags;
if (!(stat & LTQ_SPI_STAT_ERRORS)) if (!(stat & LTQ_SPI_STAT_ERRORS))
return IRQ_NONE; return IRQ_NONE;
spin_lock_irqsave(&spi->lock, flags); spin_lock_irqsave(&spi->lock, flags);
if (hwcfg->irq_ack)
lantiq_ssc_writel(spi, val, hwcfg->irncr);
if (stat & LTQ_SPI_STAT_RUE) if (stat & LTQ_SPI_STAT_RUE)
dev_err(spi->dev, "receive underflow error\n"); dev_err(spi->dev, "receive underflow error\n");
if (stat & LTQ_SPI_STAT_TUE) 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, .irnen_t = LTQ_SPI_IRNEN_T_XWAY,
.irnicr = 0xF8, .irnicr = 0xF8,
.irncr = 0xFC, .irncr = 0xFC,
.irq_ack = false,
}; };
static const struct lantiq_ssc_hwcfg lantiq_ssc_xrx = { 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, .irnen_t = LTQ_SPI_IRNEN_T_XRX,
.irnicr = 0xF8, .irnicr = 0xF8,
.irncr = 0xFC, .irncr = 0xFC,
.irq_ack = false,
}; };
static const struct of_device_id lantiq_ssc_match[] = { static const struct of_device_id lantiq_ssc_match[] = {