8000 iio: logic: m2k-logic-analyzer add tx triggering support · analogdevicesinc/linux@0306cda · GitHub
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iio: logic: m2k-logic-analyzer add tx triggering support
Pattern generator HDL IP support triggering based on external signals. This commit implement IIO interfaces to support this functionality. Signed-off-by: Bogdan Togorean <bogdan.togorean@analog.com>
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‎drivers/iio/logic/m2k-logic-analyzer.c

Lines changed: 141 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -7,6 +7,7 @@
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#include <linux/clk.h>
88
#include <linux/platform_device.h>
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#include <linux/dmaengine.h>
10+
#include <linux/bitfield.h>
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1112
#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
@@ -28,6 +29,7 @@
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#define M2K_LA_REG_TRIGGER_DELAY 0x44
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#define M2K_LA_REG_TRIGGERED 0x48
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#define M2K_LA_REG_STREAMING 0x4c
32+
#define M2K_LA_REG_INSTRUMENT_TRIGGER 0x54
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#define M2K_LA_TRIGGER_EDGE_ANY 0
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# 8000 define M2K_LA_TRIGGER_EDGE_RISING 1
@@ -38,6 +40,10 @@
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#define M2K_LA_TRIGGER_LOGIC_MODE_OR 0
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#define M2K_LA_TRIGGER_LOGIC_MODE_AND 1
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43+
#define M2K_LA_TRIGGER_CONDITION_MASK(x) (0x155 << x)
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#define M2K_LA_TRIGGER_SOURCE_MASK GENMASK(19, 16)
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#define M2K_LA_TRIGGER_EXT_SOURCE_MASK GENMASK(17, 16)
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4147
struct m2k_la {
4248
void __iomem *regs;
4349

@@ -69,6 +75,17 @@ static unsigned int m2k_la_read(struct m2k_la *m2k_la, unsigned int reg)
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return readl_relaxed(m2k_la->regs + reg);
7076
}
7177

78+
static void m2k_la_update(struct m2k_la *m2k_la, unsigned int reg,
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unsigned int writeval, const unsigned int mask)
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{
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unsigned int regval;
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83+
regval = m2k_la_read(m2k_la, reg);
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regval &= ~mask;
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writeval &= mask;
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m2k_la_write(m2k_la, reg, writeval | regval);
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}
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7289
static int m2k_la_read_raw(struct iio_dev *indio_dev,
7390
const struct iio_chan_spec *chan, int *val, int *val2, long info)
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{
@@ -433,6 +450,129 @@ static const struct iio_chan_spec_ext_info m2k_la_rx_ext_info[] = {
433450
{}
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};
435452

453+
static int m2k_la_set_trig_condition(struct iio_dev *indio_dev,
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const struct iio_chan_spec *chan, unsigned int val)
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{
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struct m2k_la *m2k_la = iio_device_get_drvdata(indio_dev);
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int trig_src;
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mutex_lock(&m2k_la->lock);
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/* Read Trig SRC */
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trig_src = m2k_la_read(m2k_la, M2K_LA_REG_INSTRUMENT_TRIGGER);
462+
trig_src = FIELD_GET(M2K_LA_TRIGGER_EXT_SOURCE_MASK, trig_src);
463+
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if (trig_src) {
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trig_src -= 1;
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if (val)
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/* Subtract 1 because of the none item. Multiply with 2
468+
* and shift with trig_src due to channel selection
469+
*/
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val = BIT(2 * (val - 1)) << trig_src;
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m2k_la_update(m2k_la, M2K_LA_REG_INSTRUMENT_TRIGGER, val,
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M2K_LA_TRIGGER_CONDITION_MASK(trig_src));
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}
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mutex_unlock(&m2k_la->lock);
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return 0;
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}
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static int m2k_la_get_trig_condition(struct iio_dev *indio_dev,
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const struct iio_chan_spec *chan)
483+
{
484+
struct m2k_la *m2k_la = iio_device_get_drvdata(indio_dev);
485+
int val, trig_src;
486+
487+
/* Read Trig SRC */
488+
trig_src = val = m2k_la_read(m2k_la, M2K_LA_REG_INSTRUMENT_TRIGGER);
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trig_src = FIELD_GET(M2K_LA_TRIGGER_EXT_SOURCE_MASK, trig_src);
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491+
if (trig_src) {
492+
trig_src -= 1;
493+
val &= M2K_LA_TRIGGER_CONDITION_MASK(trig_src);
494+
return ((fls(val >> trig_src) + 1) / 2);
495+
}
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return 0;
498+
}
499+
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static const char * const m2k_la_trigger_tx_items[] = {
501+
"none",
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"level-low",
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"level-high",
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"edge-any",
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"edge-rising",
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"edge-falling",
507+
};
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static const struct iio_enum m2k_la_trig_condition_enum = {
510+
.items = m2k_la_trigger_tx_items,
511+
.num_items = ARRAY_SIZE(m2k_la_trigger_tx_items),
512+
.set = m2k_la_set_trig_condition,
513+
.get = m2k_la_get_trig_condition,
514+
};
515+
516+
static int m2k_la_set_trig_src(struct iio_dev *indio_dev,
517+
const struct iio_chan_spec *chan, unsigned int val)
518+
{
519+
struct m2k_la *m2k_la = iio_device_get_drvdata(indio_dev);
520+
521+
mutex_lock(&m2k_la->lock);
522+
523+
/* reset required by HDL */
524+
m2k_la_update(m2k_la, M2K_LA_REG_INSTRUMENT_TRIGGER, 0x0,
525+
M2K_LA_TRIGGER_SOURCE_MASK);
526+
527+
val = BIT(val) << 15;
528+
m2k_la_update(m2k_la, M2K_LA_REG_INSTRUMENT_TRIGGER, val,
529+
M2K_LA_TRIGGER_SOURCE_MASK);
530+
531+
mutex_unlock(&m2k_la->lock);
532+
533+
return 0;
534+
}
535+
536+
static int m2k_la_get_trig_src(struct iio_dev *indio_dev,
537+
const struct iio_chan_spec *chan)
538+
{
539+
struct m2k_la *m2k_la = iio_device_get_drvdata(indio_dev);
540+
int val;
541+
542+
val = m2k_la_read(m2k_la, M2K_LA_REG_INSTRUMENT_TRIGGER);
543+
544+
if (val & M2K_LA_TRIGGER_SOURCE_MASK)
545+
return fls(val) - 16;
546+
547+
return 0;
548+
}
549+
550+
static const char * const m2k_la_trig_src_items[] = {
551+
"none",
552+
"trigger-i_0",
553+
"trigger-i_1",
554+
"trigger-adc",
555+
"trigger-la",
556+
};
557+
558+
static const struct iio_enum m2k_la_trig_src_enum = {
559+
.items = m2k_la_trig_src_items,
560+
.num_items = ARRAY_SIZE(m2k_la_trig_src_items),
561+
.set = m2k_la_set_trig_src,
562+
.get = m2k_la_get_trig_src,
563+
};
564+
565+
static const struct iio_chan_spec_ext_info m2k_la_tx_ext_info[] = {
566+
IIO_ENUM_AVAILABLE_SHARED("trigger_src", IIO_SHARED_BY_ALL,
567+
&m2k_la_trig_src_enum),
568+
IIO_ENUM("trigger_src", IIO_SHARED_BY_ALL, &m2k_la_trig_src_enum),
569+
IIO_ENUM_AVAILABLE_SHARED("trigger_condition", IIO_SHARED_BY_ALL,
570+
&m2k_la_trig_condition_enum),
571+
IIO_ENUM("trigger_condition", IIO_SHARED_BY_ALL,
572+
&m2k_la_trig_condition_enum),
573+
{ },
574+
};
575+
436576
static int m2k_la_set_direction(struct iio_dev *indio_dev,
437577
const struct iio_chan_spec *chan, unsigned int val)
438578
{
@@ -603,6 +743,7 @@ static const struct iio_chan_spec_ext_info m2k_la_ext_info[] = {
603743
.output = 1, \
604744
.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
605745
.scan_index = 0, \
746+
.ext_info = m2k_la_tx_ext_info, \
606747
.scan_type = { \
607748
.sign = 'u', \
608749
.realbits = 1, \

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