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counter: ti-eqep: add direction support

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Add support for reading the direction and for emitting direction change
events to the ti-eqep counter driver.

Signed-off-by: David Lechner <dlechner@baylibre.com>
Link: https://lore.kernel.org/r/20250110-counter-ti-eqep-add-direction-support-v2-4-c6b6f96d2db9@baylibre.com
Signed-off-by: William Breathitt Gray <wbg@kernel.org>
This commit is contained in:
David Lechner
2025-01-10 18:22:07 -06:00
committed by William Breathitt Gray
parent 37f7a388b3
commit c2a7566603
1 changed files with 32 additions and 0 deletions
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32
drivers/counter/ti-eqep.c
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@@ -107,6 +107,15 @@
#define QCLR_PCE BIT(1)
#define QCLR_INT BIT(0)
#define QEPSTS_UPEVNT BIT(7)
#define QEPSTS_FDF BIT(6)
#define QEPSTS_QDF BIT(5)
#define QEPSTS_QDLF BIT(4)
#define QEPSTS_COEF BIT(3)
#define QEPSTS_CDEF BIT(2)
#define QEPSTS_FIMF BIT(1)
#define QEPSTS_PCEF BIT(0)
/* EQEP Inputs */
enum {
TI_EQEP_SIGNAL_QEPA, /* QEPA/XCLK */
@@ -286,6 +295,9 @@ static int ti_eqep_events_configure(struct counter_device *counter)
case COUNTER_EVENT_UNDERFLOW:
qeint |= QEINT_PCU;
break;
case COUNTER_EVENT_DIRECTION_CHANGE:
qeint |= QEINT_QDC;
break;
}
}
@@ -298,6 +310,7 @@ static int ti_eqep_watch_validate(struct counter_device *counter,
switch (watch->event) {
case COUNTER_EVENT_OVERFLOW:
case COUNTER_EVENT_UNDERFLOW:
case COUNTER_EVENT_DIRECTION_CHANGE:
if (watch->channel != 0)
return -EINVAL;
@@ -368,11 +381,27 @@ static int ti_eqep_position_enable_write(struct counter_device *counter,
return 0;
}
static int ti_eqep_direction_read(struct counter_device *counter,
struct counter_count *count,
enum counter_count_direction *direction)
{
struct ti_eqep_cnt *priv = counter_priv(counter);
u32 qepsts;
regmap_read(priv->regmap16, QEPSTS, &qepsts);
*direction = (qepsts & QEPSTS_QDF) ? COUNTER_COUNT_DIRECTION_FORWARD
: COUNTER_COUNT_DIRECTION_BACKWARD;
return 0;
}
static struct counter_comp ti_eqep_position_ext[] = {
COUNTER_COMP_CEILING(ti_eqep_position_ceiling_read,
ti_eqep_position_ceiling_write),
COUNTER_COMP_ENABLE(ti_eqep_position_enable_read,
ti_eqep_position_enable_write),
COUNTER_COMP_DIRECTION(ti_eqep_direction_read),
};
static struct counter_signal ti_eqep_signals[] = {
@@ -439,6 +468,9 @@ static irqreturn_t ti_eqep_irq_handler(int irq, void *dev_id)
if (qflg & QFLG_PCU)
counter_push_event(counter, COUNTER_EVENT_UNDERFLOW, 0);
if (qflg & QFLG_QDC)
counter_push_event(counter, COUNTER_EVENT_DIRECTION_CHANGE, 0);
regmap_write(priv->regmap16, QCLR, qflg);
return IRQ_HANDLED;