Add node to set and show programming mode for TPDM DSB subunit. Once the DSB programming mode is set, it will be written to the register DSB_CR.
Signed-off-by: Tao Zhang quic_taozha@quicinc.com --- .../ABI/testing/sysfs-bus-coresight-devices-tpdm | 14 ++++++ drivers/hwtracing/coresight/coresight-tpdm.c | 53 ++++++++++++++++++++++ drivers/hwtracing/coresight/coresight-tpdm.h | 19 ++++++++ 3 files changed, 86 insertions(+)
diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm index b15bf01..8ec7548 100644 --- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm +++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm @@ -43,3 +43,17 @@ Description: Accepts only one of the 2 values - 0 or 1. 0 : Set the DSB trigger type to false 1 : Set the DSB trigger type to true + +What: /sys/bus/coresight/devices/<tpdm-name>/dsb_mode +Date: March 2023 +KernelVersion 6.7 +Contact: Jinlong Mao (QUIC) quic_jinlmao@quicinc.com, Tao Zhang (QUIC) quic_taozha@quicinc.com +Description: + (RW) Set/Get the programming mode of the DSB for tpdm. + + Accepts the value needs to be greater than 0. What data + bits do is listed below. + Bit[0:1] : Test mode control bit for choosing the inputs. + Bit[3] : Set to 0 for low performance mode. + Set to 1 for high performance mode. + Bit[4:8] : Select byte lane for high performance mode. diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c b/drivers/hwtracing/coresight/coresight-tpdm.c index e9fc348..6201f12 100644 --- a/drivers/hwtracing/coresight/coresight-tpdm.c +++ b/drivers/hwtracing/coresight/coresight-tpdm.c @@ -4,6 +4,7 @@ */
#include <linux/amba/bus.h> +#include <linux/bitfield.h> #include <linux/bitmap.h> #include <linux/coresight.h> #include <linux/coresight-pmu.h> @@ -47,6 +48,27 @@ static void tpdm_reset_datasets(struct tpdm_drvdata *drvdata) } }
+static void set_dsb_mode(struct tpdm_drvdata *drvdata, u32 *val) +{ + u32 mode; + + /* Set the test accurate mode */ + mode = TPDM_DSB_MODE_TEST(drvdata->dsb->mode); + *val &= ~TPDM_DSB_CR_TEST_MODE; + *val |= FIELD_PREP(TPDM_DSB_CR_TEST_MODE, mode); + + /* Set the byte lane for high-performance mode */ + mode = TPDM_DSB_MODE_HPBYTESEL(drvdata->dsb->mode); + *val &= ~TPDM_DSB_CR_HPSEL; + *val |= FIELD_PREP(TPDM_DSB_CR_HPSEL, mode); + + /* Set the performance mode */ + if (drvdata->dsb->mode & TPDM_DSB_MODE_PERF) + *val |= TPDM_DSB_CR_MODE; + else + *val &= ~TPDM_DSB_CR_MODE; +} + static void tpdm_enable_dsb(struct tpdm_drvdata *drvdata) { u32 val; @@ -60,6 +82,8 @@ static void tpdm_enable_dsb(struct tpdm_drvdata *drvdata) writel_relaxed(val, drvdata->base + TPDM_DSB_TIER);
val = readl_relaxed(drvdata->base + TPDM_DSB_CR); + /* Set the mode of DSB dataset */ + set_dsb_mode(drvdata, &val); /* Set trigger type */ if (drvdata->dsb->trig_type) val |= TPDM_DSB_CR_TRIG_TYPE; @@ -244,6 +268,34 @@ static struct attribute_group tpdm_attr_grp = { .attrs = tpdm_attrs, };
+static ssize_t dsb_mode_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent); + + return sysfs_emit(buf, "%x\n", drvdata->dsb->mode); +} + +static ssize_t dsb_mode_store(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t size) +{ + struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent); + unsigned long val; + + if ((kstrtoul(buf, 0, &val)) || (val < 0) || + (val & ~TPDM_DSB_MODE_MASK)) + return -EINVAL; + + spin_lock(&drvdata->spinlock); + drvdata->dsb->mode = val & TPDM_DSB_MODE_MASK; + spin_unlock(&drvdata->spinlock); + return size; +} +static DEVICE_ATTR_RW(dsb_mode); + static ssize_t dsb_trig_type_show(struct device *dev, struct device_attribute *attr, char *buf) { @@ -316,6 +368,7 @@ static ssize_t dsb_trig_ts_store(struct device *dev, static DEVICE_ATTR_RW(dsb_trig_ts);
static struct attribute *tpdm_dsb_attrs[] = { + &dev_attr_dsb_mode.attr, &dev_attr_dsb_trig_ts.attr, &dev_attr_dsb_trig_type.attr, NULL, diff --git a/drivers/hwtracing/coresight/coresight-tpdm.h b/drivers/hwtracing/coresight/coresight-tpdm.h index f59e751..b55d6f5 100644 --- a/drivers/hwtracing/coresight/coresight-tpdm.h +++ b/drivers/hwtracing/coresight/coresight-tpdm.h @@ -15,11 +15,28 @@
/* Enable bit for DSB subunit */ #define TPDM_DSB_CR_ENA BIT(0) +/* Enable bit for DSB subunit perfmance mode */ +#define TPDM_DSB_CR_MODE BIT(1) /* Enable bit for DSB subunit trigger type */ #define TPDM_DSB_CR_TRIG_TYPE BIT(12) +/* Data bits for DSB high performace mode */ +#define TPDM_DSB_CR_HPSEL GENMASK(6, 2) +/* Data bits for DSB test mode */ +#define TPDM_DSB_CR_TEST_MODE GENMASK(10, 9) + /* Enable bit for DSB subunit trigger timestamp */ #define TPDM_DSB_TIER_XTRIG_TSENAB BIT(1)
+/* DSB programming modes */ +/* DSB mode bits mask */ +#define TPDM_DSB_MODE_MASK GENMASK(8, 0) +/* Test mode control bit*/ +#define TPDM_DSB_MODE_TEST(val) (val & GENMASK(1, 0)) +/* Performance mode */ +#define TPDM_DSB_MODE_PERF BIT(3) +/* High performance mode */ +#define TPDM_DSB_MODE_HPBYTESEL(val) (val & GENMASK(8, 4)) + /* TPDM integration test registers */ #define TPDM_ITATBCNTRL (0xEF0) #define TPDM_ITCNTRL (0xF00) @@ -48,10 +65,12 @@
/** * struct dsb_dataset - specifics associated to dsb dataset + * @mode: DSB programming mode * @trig_ts: Enable/Disable trigger timestamp. * @trig_type: Enable/Disable trigger type. */ struct dsb_dataset { + u32 mode; bool trig_ts; bool trig_type; };