[PATCH V3 2/3] soc: qcom: dcc: Add CTI-trigger support for DCC

[Souradeep Chowdhury]

CTI trigger is used to enable the Cross trigger interface for DCC.
On enabling CTI trigger the dcc software trigger can be done by
writing to CTI trig-out. Add the debugfs file ctitrigger which
gives the user option to enable ctitrigger for a list. Also add
hwtrigger debugfs file which needs to be disabled on enabling
the CTI-trigger. Hwtrigger needs to be disabled for components
to be able to write to cti-trigout.

Signed-off-by: Souradeep Chowdhury <quic_schowdhu@xxxxxxxxxxx>
---
 Documentation/ABI/testing/debugfs-driver-dcc |  16 +++
 drivers/soc/qcom/dcc.c                       | 148 ++++++++++++++++++++++++++-
 2 files changed, 160 insertions(+), 4 deletions(-)

diff --git a/Documentation/ABI/testing/debugfs-driver-dcc b/Documentation/ABI/testing/debugfs-driver-dcc
index 27ed591..6f5d965 100644
--- a/Documentation/ABI/testing/debugfs-driver-dcc
+++ b/Documentation/ABI/testing/debugfs-driver-dcc
@@ -125,3 +125,19 @@ Description:
 		on manual or crash induced triggers. Lists must
 		be configured and enabled sequentially, e.g. list
 		2 can only be enabled when list 1 have so.
+
+What:           /sys/kernel/debug/dcc/.../[list-number]/ctitrigger
+Date:           January 2023
+Contact:        Souradeep Chowdhury <quic_schowdhu@xxxxxxxxxxx>
+Description:
+	        This debugfs interface is used for enabling the
+	        ctitrigger. Ctitrigger can be enabled by writing
+	        a '1' to the file.
+
+What:	        /sys/kernel/debug/dcc/.../[list-number]/hwtrigger
+Date:           January 2023
+Contact:        Souradeep Chowdhury <quic_schowdhu@xxxxxxxxxxx>
+Description:
+	        This debugfs interface is used for enabling the
+	        hwtrigger. Hwtrigger can be enabled by writing
+		a '1' to the file.
diff --git a/drivers/soc/qcom/dcc.c b/drivers/soc/qcom/dcc.c
index 93e8f86..a75b9af 100644
--- a/drivers/soc/qcom/dcc.c
+++ b/drivers/soc/qcom/dcc.c
@@ -37,6 +37,7 @@
 #define DCC_LL_INT_STATUS		0x1c
 #define DCC_LL_SW_TRIGGER		0x2c
 #define DCC_LL_BUS_ACCESS_STATUS	0x30
+#define DCC_CTI_TRIG			0x34
 
 /* Default value used if a bit 6 in the HW_INFO register is set. */
 #define DCC_FIX_LOOP_OFFSET		16
@@ -115,6 +116,8 @@ struct dcc_config_entry {
  * @nr_link_list:	Total number of linkedlists supported by the DCC configuration
  * @loop_shift:	Loop offset bits range for the addresses
  * @enable_bitmap:	Bitmap to capture the enabled status of each linked list of addresses
+ * @cti_bitmap:		Bitmap to capture the cti-trigger status of each linked list of addresses
+ * @hwtrig_bitmap:	Bitmap to capture the hwtrig status of each linked list of addresses
  */
 struct dcc_drvdata {
 	void __iomem		*base;
@@ -132,6 +135,8 @@ struct dcc_drvdata {
 	size_t			nr_link_list;
 	u8			loop_shift;
 	unsigned long		*enable_bitmap;
+	unsigned long		*cti_bitmap;
+	unsigned long		*hwtrig_bitmap;
 };
 
 struct dcc_cfg_attr {
@@ -213,7 +218,10 @@ static int dcc_sw_trigger(struct dcc_drvdata *drvdata)
 		if (!test_bit(i, drvdata->enable_bitmap))
 			continue;
 		ll_cfg = dcc_list_readl(drvdata, i, DCC_LL_CFG);
-		tmp_ll_cfg = ll_cfg & ~DCC_TRIGGER_MASK;
+		if (drvdata->mem_map_ver != 3)
+			tmp_ll_cfg = ll_cfg & ~DCC_TRIGGER_MASK;
+		else
+			tmp_ll_cfg = ll_cfg & ~BIT(8);
 		dcc_list_writel(drvdata, tmp_ll_cfg, i, DCC_LL_CFG);
 		dcc_list_writel(drvdata, 1, i, DCC_LL_SW_TRIGGER);
 		dcc_list_writel(drvdata, ll_cfg, i, DCC_LL_CFG);
@@ -590,6 +598,23 @@ static int dcc_enable(struct dcc_drvdata *drvdata, unsigned int curr_list)
 	/* 5. Configure trigger */
 	dcc_list_writel(drvdata, DCC_TRIGGER_MASK,
 			curr_list, DCC_LL_CFG);
+	if (drvdata->mem_map_ver == 3) {
+		dcc_list_writel(drvdata, test_bit(curr_list, drvdata->cti_bitmap), curr_list,
+				DCC_CTI_TRIG);
+		if (test_bit(curr_list, drvdata->hwtrig_bitmap))
+			dcc_list_writel(drvdata, BIT(8), curr_list, DCC_LL_CFG);
+		else
+			dcc_list_writel(drvdata, (unsigned int)~BIT(8), curr_list, DCC_LL_CFG);
+	} else {
+		if (test_bit(curr_list, drvdata->hwtrig_bitmap))
+			dcc_list_writel(drvdata, DCC_TRIGGER_MASK |
+					test_bit(curr_list, drvdata->cti_bitmap) << 8,
+					curr_list, DCC_LL_CFG);
+		else
+			dcc_list_writel(drvdata, ~DCC_TRIGGER_MASK &
+					test_bit(curr_list, drvdata->cti_bitmap) << 8,
+					curr_list, DCC_LL_CFG);
+	}
 
 out_unlock:
 	mutex_unlock(&drvdata->mutex);
@@ -1116,6 +1141,110 @@ static const struct file_operations config_fops = {
 	.release = single_release,
 };
 
+static ssize_t ctitrigger_read(struct file *filp, char __user *userbuf,
+			       size_t count, loff_t *ppos)
+{
+	char *buf;
+	int curr_list;
+	struct dcc_drvdata *drvdata = filp->private_data;
+
+	curr_list = dcc_filp_curr_list(filp);
+
+	mutex_lock(&drvdata->mutex);
+
+	if (test_bit(curr_list, drvdata->cti_bitmap))
+		buf = "Y\n";
+	else
+		buf = "N\n";
+
+	mutex_unlock(&drvdata->mutex);
+
+	return simple_read_from_buffer(userbuf, count, ppos, buf, strlen(buf));
+}
+
+static ssize_t ctitrigger_write(struct file *filp, const char __user *userbuf,
+				size_t count, loff_t *ppos)
+{
+	int ret, curr_list;
+	bool val;
+	struct dcc_drvdata *drvdata = filp->private_data;
+
+	curr_list = dcc_filp_curr_list(filp);
+
+	if (test_bit(curr_list, drvdata->enable_bitmap))
+		return -EBUSY;
+
+	ret = kstrtobool_from_user(userbuf, count, &val);
+	if (ret < 0)
+		return ret;
+
+	if (val)
+		set_bit(curr_list, drvdata->cti_bitmap);
+	else
+		clear_bit(curr_list, drvdata->cti_bitmap);
+
+	return count;
+}
+
+static const struct file_operations ctitrigger_fops = {
+	.read = ctitrigger_read,
+	.write = ctitrigger_write,
+	.open = simple_open,
+	.llseek = generic_file_llseek,
+};
+
+static ssize_t hwtrigger_read(struct file *filp, char __user *userbuf,
+			      size_t count, loff_t *ppos)
+{
+	char *buf;
+	int curr_list;
+	struct dcc_drvdata *drvdata = filp->private_data;
+
+	curr_list = dcc_filp_curr_list(filp);
+
+	mutex_lock(&drvdata->mutex);
+
+	if (test_bit(curr_list, drvdata->hwtrig_bitmap))
+		buf = "Y\n";
+	else
+		buf = "N\n";
+
+	mutex_unlock(&drvdata->mutex);
+
+	return simple_read_from_buffer(userbuf, count, ppos, buf, strlen(buf));
+}
+
+static ssize_t hwtrigger_write(struct file *filp, const char __user *userbuf,
+			       size_t count, loff_t *ppos)
+{
+	int ret, curr_list;
+	bool val;
+	struct dcc_drvdata *drvdata = filp->private_data;
+
+	curr_list = dcc_filp_curr_list(filp);
+
+	if (test_bit(curr_list, drvdata->enable_bitmap))
+		return -EBUSY;
+
+	ret = kstrtobool_from_user(userbuf, count, &val);
+	if (ret < 0)
+		return ret;
+
+	if (val)
+		set_bit(curr_list, drvdata->hwtrig_bitmap);
+	else
+		clear_bit(curr_list, drvdata->hwtrig_bitmap);
+
+	return count;
+}
+
+static const struct file_operations hwtrigger_fops = {
+	.read = hwtrigger_read,
+	.write = hwtrigger_write,
+	.open = simple_open,
+	.llseek = generic_file_llseek,
+};
+
 static void dcc_delete_debug_dir(struct dcc_drvdata *drvdata)
 {
 	 debugfs_remove_recursive(drvdata->dbg_dir);
@@ -1145,6 +1274,8 @@ static void dcc_create_debug_dir(struct dcc_drvdata *drvdata)
 	debugfs_create_file("ready", 0400, drvdata->dbg_dir, drvdata, &ready_fops);
 	debugfs_create_file("config_reset", 0200, drvdata->dbg_dir,
 			    drvdata, &config_reset_fops);
+	debugfs_create_file("ctitrigger", 0600, list, drvdata, &ctitrigger_fops);
+	debugfs_create_file("hwtrigger", 0600, list, drvdata, &hwtrigger_fops);
 }
 
 static ssize_t dcc_sram_read(struct file *file, char __user *data,
@@ -1304,18 +1435,27 @@ static int __init dcc_probe(struct platform_device *pdev)
 
 	mutex_init(&drvdata->mutex);
 
-	drvdata->enable_bitmap = devm_kcalloc(dev, BITS_TO_LONGS(drvdata->nr_link_list),
-					      sizeof(*drvdata->enable_bitmap), GFP_KERNEL);
+	drvdata->enable_bitmap = devm_bitmap_alloc(dev, drvdata->nr_link_list, GFP_KERNEL);
 	if (!drvdata->enable_bitmap)
 		return -ENOMEM;
 
+	drvdata->cti_bitmap = devm_bitmap_alloc(dev, drvdata->nr_link_list, GFP_KERNEL);
+	if (!drvdata->cti_bitmap)
+		return -ENOMEM;
+
+	drvdata->hwtrig_bitmap = devm_bitmap_alloc(dev, drvdata->nr_link_list, GFP_KERNEL);
+	if (!drvdata->hwtrig_bitmap)
+		return -ENOMEM;
+
 	drvdata->cfg_head = devm_kcalloc(dev, drvdata->nr_link_list,
 					 sizeof(*drvdata->cfg_head), GFP_KERNEL);
 	if (!drvdata->cfg_head)
 		return -ENOMEM;
 
-	for (i = 0; i < drvdata->nr_link_list; i++)
+	for (i = 0; i < drvdata->nr_link_list; i++) {
 		INIT_LIST_HEAD(&drvdata->cfg_head[i]);
+		set_bit(i, drvdata->hwtrig_bitmap);
+	}
 
 	ret = dcc_sram_dev_init(drvdata);
 	if (ret) {
-- 
2.7.4