[PATCH v1 7/9] coresight-tpdm: Add nodes for dsb element creation

Tao Zhang
2022-11-21T08:23:43Z

Add the nodes to set value for DSB edge control and DSB edge
control mask. Each DSB subunit TPDM has maximum of n(n<16) EDCR
resgisters to configure edge control. DSB edge detection control
00: Rising edge detection
01: Falling edge detection
10: Rising and falling edge detection (toggle detection)
And each DSB subunit TPDM has maximum of m(m<8) ECDMR registers to
configure mask. Eight 32 bit registers providing DSB interface
edge detection mask control.

Signed-off-by: Tao Zhang <quic_taozha@quicinc.com>
---
drivers/hwtracing/coresight/coresight-tpdm.c | 142 ++++++++++++++++++++++++++-
drivers/hwtracing/coresight/coresight-tpdm.h | 14 +++
2 files changed, 155 insertions(+), 1 deletion(-)

diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c b/drivers/hwtracing/coresight/coresight-tpdm.c
index 8872e3a..b0cc161 100644
--- a/drivers/hwtracing/coresight/coresight-tpdm.c
+++ b/drivers/hwtracing/coresight/coresight-tpdm.c
@@ -39,7 +39,14 @@ static umode_t tpdm_dsb_is_visible(struct kobject *kobj,

static void tpdm_enable_dsb(struct tpdm_drvdata *drvdata)
{
- u32 val, mode;
+ u32 val, mode, i;
+
+ for (i = 0; i < TPDM_DSB_MAX_EDCR; i++)
+ writel_relaxed(drvdata->dsb->edge_ctrl[i],
+ drvdata->base + TPDM_DSB_EDCR(i));
+ for (i = 0; i < TPDM_DSB_MAX_EDCMR; i++)
+ writel_relaxed(drvdata->dsb->edge_ctrl_mask[i],
+ drvdata->base + TPDM_DSB_EDCMR(i));

val = readl_relaxed(drvdata->base + TPDM_DSB_TIER);
/* Set trigger timestamp */
@@ -299,6 +306,137 @@ static ssize_t dsb_mode_store(struct device *dev,
}
static DEVICE_ATTR_RW(dsb_mode);

+static ssize_t dsb_edge_ctrl_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
+ ssize_t size = 0;
+ int i;
+
+ spin_lock(&drvdata->spinlock);
+ for (i = 0; i < TPDM_DSB_MAX_EDCR; i++) {
+ size += sysfs_emit_at(buf, size,
+ "Index:0x%x Val:0x%x\n", i,
+ drvdata->dsb->edge_ctrl[i]);
+ }
+ spin_unlock(&drvdata->spinlock);
+ return size;
+}
+
+/*
+ * value 1: Start EDCR register number
+ * value 2: End EDCR register number
+ * value 3: The value need to be written
+ * The EDCR registers can include up to 16 32-bit registers, and each
+ * one can be configured to control up to 16 edge detections(2 bits
+ * control one edge detection). So a total 256 edge detections can be
+ * configured. So the starting number(value 1) and ending number(value 2)
+ * cannot be greater than 256, and value 1 should be less than value 2.
+ * The following values are the rage of value 3.
+ * 0 - Rising edge detection
+ * 1 - Falling edge detection
+ * 2 - Rising and falling edge detection (toggle detection)
+ */
+static ssize_t dsb_edge_ctrl_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 start, end, edge_ctrl;
+ uint32_t val;
+ int i, index, bit, reg;
+
+ if (sscanf(buf, "%lx %lx %lx", &start, &end, &edge_ctrl) != 3)
+ return -EINVAL;
+ if ((start >= TPDM_DSB_MAX_LINES) || (end >= TPDM_DSB_MAX_LINES) ||
+ edge_ctrl > 0x2)
+ return -EPERM;
+
+ spin_lock(&drvdata->spinlock);
+ for (i = start; i <= end; i++) {
+ /*
+ * The 32-bit register has 32 bits(NUM_OF_BITS).
+ * Each one register can be configured to control 16
+ * (NUM_OF_BITS / 2) edge detectioins.
+ */
+ reg = i / (NUM_OF_BITS / 2);
+ index = i % (NUM_OF_BITS / 2);
+ bit = index * 2;
+
+ val = drvdata->dsb->edge_ctrl[reg];
+ val &= ~GENMASK((bit + 1), bit);
+ val |= (edge_ctrl << bit);
+ drvdata->dsb->edge_ctrl[reg] = val;
+ }
+ spin_unlock(&drvdata->spinlock);
+
+ return size;
+}
+static DEVICE_ATTR_RW(dsb_edge_ctrl);
+
+static ssize_t dsb_edge_ctrl_mask_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
+ ssize_t size = 0;
+ int i;
+
+ spin_lock(&drvdata->spinlock);
+ for (i = 0; i < TPDM_DSB_MAX_EDCR / 2; i++) {
+ size += sysfs_emit_at(buf, size,
+ "Index:0x%x Val:0x%x\n", i,
+ drvdata->dsb->edge_ctrl_mask[i]);
+ }
+ spin_unlock(&drvdata->spinlock);
+ return size;
+}
+
+/*
+ * value 1: Start EDCMR register number
+ * value 2: End EDCMR register number
+ * value 3: The value need to be written
+ */
+static ssize_t dsb_edge_ctrl_mask_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 start, end, val;
+ u32 set;
+ int i, index, reg;
+
+ if (sscanf(buf, "%lx %lx %lx", &start, &end, &val) != 3)
+ return -EINVAL;
+ if ((start >= TPDM_DSB_MAX_LINES) || (end >= TPDM_DSB_MAX_LINES)
+ || (val < 0) || (val > 1))
+ return -EPERM;
+
+ spin_lock(&drvdata->spinlock);
+ for (i = start; i <= end; i++) {
+ /*
+ * The 32-bit register has 32 bits(NUM_OF_BITS).
+ * Each one register can be configured to control 32
+ * (NUM_OF_BITS) edge detectioin masks.
+ */
+ reg = i / NUM_OF_BITS;
+ index = (i % NUM_OF_BITS);
+
+ set = drvdata->dsb->edge_ctrl_mask[reg];
+ if (val)
+ set |= BIT(index);
+ else
+ set &= ~BIT(index);
+ drvdata->dsb->edge_ctrl_mask[reg] = set;
+ }
+ spin_unlock(&drvdata->spinlock);
+ return size;
+}
+static DEVICE_ATTR_RW(dsb_edge_ctrl_mask);
+
static ssize_t dsb_trig_type_show(struct device *dev,
struct device_attribute *attr,
char *buf)
@@ -370,6 +508,8 @@ 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_edge_ctrl.attr,
+ &dev_attr_dsb_edge_ctrl_mask.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 de1492c..bd9d006 100644
--- a/drivers/hwtracing/coresight/coresight-tpdm.h
+++ b/drivers/hwtracing/coresight/coresight-tpdm.h
@@ -12,6 +12,8 @@
/* DSB Subunit Registers */
#define TPDM_DSB_CR (0x780)
#define TPDM_DSB_TIER (0x784)
+#define TPDM_DSB_EDCR(n) (0x808 + (n * 4))
+#define TPDM_DSB_EDCMR(n) (0x848 + (n * 4))

/* Enable bit for DSB subunit */
#define TPDM_DSB_CR_ENA BIT(0)
@@ -30,6 +32,8 @@
#define TPDM_DSB_TEST_MODE GENMASK(11, 9)
#define TPDM_DSB_HPSEL GENMASK(6, 2)

+#define NUM_OF_BITS 32
+
/* TPDM integration test registers */
#define TPDM_ITATBCNTRL (0xEF0)
#define TPDM_ITCNTRL (0xF00)
@@ -56,14 +60,24 @@
#define TPDM_PIDR0_DS_IMPDEF BIT(0)
#define TPDM_PIDR0_DS_DSB BIT(1)

+#define TPDM_DSB_MAX_LINES 256
+/* MAX number of EDCR registers */
+#define TPDM_DSB_MAX_EDCR 16
+/* MAX number of EDCMR registers */
+#define TPDM_DSB_MAX_EDCMR 8
+
/**
* struct dsb_dataset - specifics associated to dsb dataset
* @mode: DSB programming mode
+ * @edge_ctrl: Save value for edge control
+ * @edge_ctrl_mask: Save value for edge control mask
* @trig_ts: Enable/Disable trigger timestamp.
* @trig_type: Enable/Disable trigger type.
*/
struct dsb_dataset {
u32 mode;
+ u32 edge_ctrl[TPDM_DSB_MAX_EDCR];
+ u32 edge_ctrl_mask[TPDM_DSB_MAX_EDCMR];
bool trig_ts;
bool trig_type;
};
--
2.7.4