[PATCH v13 05/10] usb: dwc3: qcom: Refactor IRQ handling in QCOM Glue driver

[Krishna Kurapati]

Refactor setup_irq call to facilitate reading multiport IRQ's along
with non mulitport ones. Read through the interrupt-names property
to figure out, the type of interrupt (DP/DM/HS/SS) and to which port
it belongs. Also keep track of port index to calculate port count
based on interrupts provided as input in DT.

Signed-off-by: Krishna Kurapati <quic_kriskura@xxxxxxxxxxx>
---
 drivers/usb/dwc3/dwc3-qcom.c | 210 +++++++++++++++++++++++++----------
 1 file changed, 154 insertions(+), 56 deletions(-)

diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c
index ef2006db7601..863892284146 100644
--- a/drivers/usb/dwc3/dwc3-qcom.c
+++ b/drivers/usb/dwc3/dwc3-qcom.c
@@ -53,14 +53,25 @@
 #define APPS_USB_AVG_BW 0
 #define APPS_USB_PEAK_BW MBps_to_icc(40)
 
+#define NUM_PHY_IRQ		4
+
+enum dwc3_qcom_ph_index {
+	DP_HS_PHY_IRQ_INDEX = 0,
+	DM_HS_PHY_IRQ_INDEX,
+	SS_PHY_IRQ_INDEX,
+	HS_PHY_IRQ_INDEX,
+};
+
 struct dwc3_acpi_pdata {
 	u32			qscratch_base_offset;
 	u32			qscratch_base_size;
 	u32			dwc3_core_base_size;
+	/*
+	 * The phy_irq_index corresponds to ACPI indexes of (in order) DP/DM/SS
+	 * IRQ's respectively.
+	 */
+	int			phy_irq_index[NUM_PHY_IRQ - 1];
 	int			hs_phy_irq_index;
-	int			dp_hs_phy_irq_index;
-	int			dm_hs_phy_irq_index;
-	int			ss_phy_irq_index;
 	bool			is_urs;
 };
 
@@ -73,10 +84,12 @@ struct dwc3_qcom {
 	int			num_clocks;
 	struct reset_control	*resets;
 
+	/*
+	 * The phy_irq corresponds to IRQ's registered for (in order) DP/DM/SS
+	 * respectively.
+	 */
+	int			phy_irq[NUM_PHY_IRQ - 1][DWC3_MAX_PORTS];
 	int			hs_phy_irq;
-	int			dp_hs_phy_irq;
-	int			dm_hs_phy_irq;
-	int			ss_phy_irq;
 	enum usb_device_speed	usb2_speed;
 
 	struct extcon_dev	*edev;
@@ -91,6 +104,7 @@ struct dwc3_qcom {
 	bool			pm_suspended;
 	struct icc_path		*icc_path_ddr;
 	struct icc_path		*icc_path_apps;
+	int			num_ports;
 };
 
 static inline void dwc3_qcom_setbits(void __iomem *base, u32 offset, u32 val)
@@ -375,16 +389,16 @@ static void dwc3_qcom_disable_interrupts(struct dwc3_qcom *qcom)
 	dwc3_qcom_disable_wakeup_irq(qcom->hs_phy_irq);
 
 	if (qcom->usb2_speed == USB_SPEED_LOW) {
-		dwc3_qcom_disable_wakeup_irq(qcom->dm_hs_phy_irq);
+		dwc3_qcom_disable_wakeup_irq(qcom->phy_irq[DM_HS_PHY_IRQ_INDEX][0]);
 	} else if ((qcom->usb2_speed == USB_SPEED_HIGH) ||
 			(qcom->usb2_speed == USB_SPEED_FULL)) {
-		dwc3_qcom_disable_wakeup_irq(qcom->dp_hs_phy_irq);
+		dwc3_qcom_disable_wakeup_irq(qcom->phy_irq[DP_HS_PHY_IRQ_INDEX][0]);
 	} else {
-		dwc3_qcom_disable_wakeup_irq(qcom->dp_hs_phy_irq);
-		dwc3_qcom_disable_wakeup_irq(qcom->dm_hs_phy_irq);
+		dwc3_qcom_disable_wakeup_irq(qcom->phy_irq[DP_HS_PHY_IRQ_INDEX][0]);
+		dwc3_qcom_disable_wakeup_irq(qcom->phy_irq[DM_HS_PHY_IRQ_INDEX][0]);
 	}
 
-	dwc3_qcom_disable_wakeup_irq(qcom->ss_phy_irq);
+	dwc3_qcom_disable_wakeup_irq(qcom->phy_irq[SS_PHY_IRQ_INDEX][0]);
 }
 
 static void dwc3_qcom_enable_interrupts(struct dwc3_qcom *qcom)
@@ -401,20 +415,20 @@ static void dwc3_qcom_enable_interrupts(struct dwc3_qcom *qcom)
 	 */
 
 	if (qcom->usb2_speed == USB_SPEED_LOW) {
-		dwc3_qcom_enable_wakeup_irq(qcom->dm_hs_phy_irq,
+		dwc3_qcom_enable_wakeup_irq(qcom->phy_irq[DM_HS_PHY_IRQ_INDEX][0],
 						IRQ_TYPE_EDGE_FALLING);
 	} else if ((qcom->usb2_speed == USB_SPEED_HIGH) ||
 			(qcom->usb2_speed == USB_SPEED_FULL)) {
-		dwc3_qcom_enable_wakeup_irq(qcom->dp_hs_phy_irq,
+		dwc3_qcom_enable_wakeup_irq(qcom->phy_irq[DP_HS_PHY_IRQ_INDEX][0],
 						IRQ_TYPE_EDGE_FALLING);
 	} else {
-		dwc3_qcom_enable_wakeup_irq(qcom->dp_hs_phy_irq,
+		dwc3_qcom_enable_wakeup_irq(qcom->phy_irq[DP_HS_PHY_IRQ_INDEX][0],
 						IRQ_TYPE_EDGE_RISING);
-		dwc3_qcom_enable_wakeup_irq(qcom->dm_hs_phy_irq,
+		dwc3_qcom_enable_wakeup_irq(qcom->phy_irq[DM_HS_PHY_IRQ_INDEX][0],
 						IRQ_TYPE_EDGE_RISING);
 	}
 
-	dwc3_qcom_enable_wakeup_irq(qcom->ss_phy_irq, 0);
+	dwc3_qcom_enable_wakeup_irq(qcom->phy_irq[SS_PHY_IRQ_INDEX][0], 0);
 }
 
 static int dwc3_qcom_suspend(struct dwc3_qcom *qcom, bool wakeup)
@@ -535,8 +549,8 @@ static int dwc3_qcom_get_irq(struct platform_device *pdev,
 	return ret;
 }
 
-static int dwc3_qcom_prep_irq(struct dwc3_qcom *qcom, char *irq_name,
-				char *disp_name, int irq)
+static int dwc3_qcom_prep_irq(struct dwc3_qcom *qcom, const char *irq_name,
+				const char *disp_name, int irq)
 {
 	int ret;
 
@@ -553,47 +567,135 @@ static int dwc3_qcom_prep_irq(struct dwc3_qcom *qcom, char *irq_name,
 	return ret;
 }
 
+static int dwc3_qcom_get_irq_index(const char *irq_name)
+{
+	/*
+	 * If we are reading IRQ not supported by the driver
+	 * like pwr_event_irq, then return -1 indicating the next
+	 * helper function to skip processing IRQ name further.
+	 */
+	int irq_index = -1;
+
+	if (strncmp(irq_name, "dp_hs_phy", strlen("dp_hs_phy")) == 0)
+		irq_index = DP_HS_PHY_IRQ_INDEX;
+	else if (strncmp(irq_name, "dm_hs_phy", strlen("dm_hs_phy")) == 0)
+		irq_index = DM_HS_PHY_IRQ_INDEX;
+	else if (strncmp(irq_name, "ss_phy", strlen("ss_phy")) == 0)
+		irq_index = SS_PHY_IRQ_INDEX;
+	else if (strncmp(irq_name, "hs_phy", strlen("hs_phy")) == 0)
+		irq_index = HS_PHY_IRQ_INDEX;
+	return irq_index;
+}
+
+static int dwc3_qcom_get_port_index(const char *irq_name, int irq_index)
+{
+	int port_index = -1;
+
+	switch (irq_index) {
+	case DP_HS_PHY_IRQ_INDEX:
+		if (strcmp(irq_name, "dp_hs_phy_irq") == 0)
+			port_index = 1;
+		else
+			sscanf(irq_name, "dp_hs_phy_%d", &port_index);
+		break;
+
+	case DM_HS_PHY_IRQ_INDEX:
+		if (strcmp(irq_name, "dm_hs_phy_irq") == 0)
+			port_index = 1;
+		else
+			sscanf(irq_name, "dm_hs_phy_%d", &port_index);
+		break;
+
+	case SS_PHY_IRQ_INDEX:
+		if (strcmp(irq_name, "ss_phy_irq") == 0)
+			port_index = 1;
+		else
+			sscanf(irq_name, "ss_phy_%d", &port_index);
+		break;
+
+	case HS_PHY_IRQ_INDEX:
+		port_index = 1;
+		break;
+	}
+
+	if (port_index > DWC3_MAX_PORTS)
+		port_index = -1;
+
+	return port_index;
+}
+
+static int dwc3_qcom_get_acpi_index(struct dwc3_qcom *qcom, int irq_index,
+					int port_index)
+{
+	const struct dwc3_acpi_pdata *pdata = qcom->acpi_pdata;
+	int acpi_index = -1;
+
+	/*
+	 * Currently multiport supported targets don't have an ACPI variant.
+	 * So return -1 if we are not dealing with first port of the controller.
+	 */
+	if ((pdata == NULL) || (port_index != 1))
+		goto done;
+
+	if (irq_index == HS_PHY_IRQ_INDEX)
+		acpi_index = pdata->hs_phy_irq_index;
+	else
+		acpi_index = pdata->phy_irq_index[irq_index];
+
+done:
+	return acpi_index;
+}
+
 static int dwc3_qcom_setup_irq(struct platform_device *pdev)
 {
 	struct dwc3_qcom *qcom = platform_get_drvdata(pdev);
-	const struct dwc3_acpi_pdata *pdata = qcom->acpi_pdata;
+	struct device_node *np = pdev->dev.of_node;
+	const char **irq_names;
+	int port_index;
+	int acpi_index;
+	int irq_count;
+	int irq_index;
 	int irq;
 	int ret;
+	int i;
 
-	irq = dwc3_qcom_get_irq(pdev, "hs_phy_irq",
-				pdata ? pdata->hs_phy_irq_index : -1);
-	if (irq > 0) {
-		ret = dwc3_qcom_prep_irq(qcom, "hs_phy_irq", "qcom_dwc3 HS", irq);
-		if (ret)
-			return ret;
-		qcom->hs_phy_irq = irq;
-	}
+	irq_count = of_property_count_strings(np, "interrupt-names");
+	irq_names = devm_kzalloc(&pdev->dev, sizeof(*irq_names) * irq_count, GFP_KERNEL);
+	if (!irq_names)
+		return -ENOMEM;
 
-	irq = dwc3_qcom_get_irq(pdev, "dp_hs_phy_irq",
-				pdata ? pdata->dp_hs_phy_irq_index : -1);
-	if (irq > 0) {
-		ret = dwc3_qcom_prep_irq(qcom, "dp_hs_phy_irq", "qcom_dwc3 DP_HS", irq);
-		if (ret)
-			return ret;
-		qcom->dp_hs_phy_irq = irq;
-	}
+	ret = of_property_read_string_array(np, "interrupt-names",
+						irq_names, irq_count);
+	for (i = 0; i < irq_count; i++) {
+		irq_index = dwc3_qcom_get_irq_index(irq_names[i]);
+		if (irq_index == -1) {
+			dev_dbg(&pdev->dev, "Invalid IRQ not handled");
+			continue;
+		}
 
-	irq = dwc3_qcom_get_irq(pdev, "dm_hs_phy_irq",
-				pdata ? pdata->dm_hs_phy_irq_index : -1);
-	if (irq > 0) {
-		ret = dwc3_qcom_prep_irq(qcom, "dm_hs_phy_irq", "qcom_dwc3 DM_HS", irq);
-		if (ret)
-			return ret;
-		qcom->dm_hs_phy_irq = irq;
-	}
+		port_index = dwc3_qcom_get_port_index(irq_names[i], irq_index);
+		if (port_index == -1) {
+			dev_dbg(&pdev->dev, "Port index invalid. IRQ not handled");
+			continue;
+		}
 
-	irq = dwc3_qcom_get_irq(pdev, "ss_phy_irq",
-				pdata ? pdata->ss_phy_irq_index : -1);
-	if (irq > 0) {
-		ret = dwc3_qcom_prep_irq(qcom, "ss_phy_irq", "qcom_dwc3 SS", irq);
-		if (ret)
-			return ret;
-		qcom->ss_phy_irq = irq;
+		acpi_index = dwc3_qcom_get_acpi_index(qcom, irq_index, port_index);
+
+		irq = dwc3_qcom_get_irq(pdev, irq_names[i], acpi_index);
+		if (irq > 0) {
+			ret = dwc3_qcom_prep_irq(qcom, irq_names[i],
+							irq_names[i], irq);
+			if (ret)
+				return ret;
+
+			if (irq_index == HS_PHY_IRQ_INDEX)
+				qcom->hs_phy_irq = irq;
+			else
+				qcom->phy_irq[irq_index][port_index-1] = irq;
+
+			if (qcom->num_ports < port_index)
+				qcom->num_ports = port_index;
+		}
 	}
 
 	return 0;
@@ -1026,20 +1128,16 @@ static const struct dwc3_acpi_pdata sdm845_acpi_pdata = {
 	.qscratch_base_offset = SDM845_QSCRATCH_BASE_OFFSET,
 	.qscratch_base_size = SDM845_QSCRATCH_SIZE,
 	.dwc3_core_base_size = SDM845_DWC3_CORE_SIZE,
+	.phy_irq_index = {4, 3, 2},
 	.hs_phy_irq_index = 1,
-	.dp_hs_phy_irq_index = 4,
-	.dm_hs_phy_irq_index = 3,
-	.ss_phy_irq_index = 2
 };
 
 static const struct dwc3_acpi_pdata sdm845_acpi_urs_pdata = {
 	.qscratch_base_offset = SDM845_QSCRATCH_BASE_OFFSET,
 	.qscratch_base_size = SDM845_QSCRATCH_SIZE,
 	.dwc3_core_base_size = SDM845_DWC3_CORE_SIZE,
+	.phy_irq_index = {4, 3, 2},
 	.hs_phy_irq_index = 1,
-	.dp_hs_phy_irq_index = 4,
-	.dm_hs_phy_irq_index = 3,
-	.ss_phy_irq_index = 2,
 	.is_urs = true,
 };
 
-- 
2.42.0