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From:   Nagarjuna Kristam <nkristam@nvidia.com>
To:     <balbi@kernel.org>, <gregkh@linuxfoundation.org>,
        <thierry.reding@gmail.com>, <jonathanh@nvidia.com>,
        <mark.rutland@arm.com>, <robh+dt@kernel.org>, <kishon@ti.com>
CC:     <devicetree@vger.kernel.org>, <linux-tegra@vger.kernel.org>,
        <linux-usb@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        Nagarjuna Kristam <nkristam@nvidia.com>
Subject: [Patch V4 12/19] usb: gadget: tegra-xudc: support multiple device modes
Date:   Tue, 4 Feb 2020 16:46:58 +0530
Message-ID: <1580815025-10915-13-git-send-email-nkristam@nvidia.com>
In-Reply-To: <1580815025-10915-1-git-send-email-nkristam@nvidia.com>
References: <1580815025-10915-1-git-send-email-nkristam@nvidia.com>
MIME-Version: 1.0
Content-Type: text/plain
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

This change supports limited multiple device modes by:
- At most 4 ports contains OTG/Device capability.
- One port run as device mode at a time.

Signed-off-by: Nagarjuna Kristam <nkristam@nvidia.com>
---
V4:
 - Replaced current_phy_index usage with curr_*phy pointers.
 - Used unsigned int instead of int wherever needed.
---
V3:
 - No changes in this version
---
V2:
 - Updated err variable on failure to get usbphy.
 - Corrected identation after tegra_xudc_phy_get API call in tegra_xudc_probe.
---
 drivers/usb/gadget/udc/tegra-xudc.c | 217 ++++++++++++++++++++++++++----------
 1 file changed, 160 insertions(+), 57 deletions(-)

diff --git a/drivers/usb/gadget/udc/tegra-xudc.c b/drivers/usb/gadget/udc/tegra-xudc.c
index a2299ee..3ffb929 100644
--- a/drivers/usb/gadget/udc/tegra-xudc.c
+++ b/drivers/usb/gadget/udc/tegra-xudc.c
@@ -482,14 +482,16 @@ struct tegra_xudc {
 	bool device_mode;
 	struct work_struct usb_role_sw_work;
 
-	struct phy *usb3_phy;
-	struct phy *utmi_phy;
+	struct phy **usb3_phy;
+	struct phy *curr_usb3_phy;
+	struct phy **utmi_phy;
+	struct phy *curr_utmi_phy;
 
 	struct tegra_xudc_save_regs saved_regs;
 	bool suspended;
 	bool powergated;
 
-	struct usb_phy *usbphy;
+	struct usb_phy **usbphy;
 	struct notifier_block vbus_nb;
 
 	struct completion disconnect_complete;
@@ -521,6 +523,7 @@ struct tegra_xudc_soc {
 	unsigned int num_supplies;
 	const char * const *clock_names;
 	unsigned int num_clks;
+	unsigned int num_phys;
 	bool u1_enable;
 	bool u2_enable;
 	bool lpm_enable;
@@ -602,17 +605,18 @@ static void tegra_xudc_device_mode_on(struct tegra_xudc *xudc)
 
 	pm_runtime_get_sync(xudc->dev);
 
-	err = phy_power_on(xudc->utmi_phy);
+	err = phy_power_on(xudc->curr_utmi_phy);
 	if (err < 0)
 		dev_err(xudc->dev, "utmi power on failed %d\n", err);
 
-	err = phy_power_on(xudc->usb3_phy);
+	err = phy_power_on(xudc->curr_usb3_phy);
 	if (err < 0)
 		dev_err(xudc->dev, "usb3 phy power on failed %d\n", err);
 
 	dev_dbg(xudc->dev, "device mode on\n");
 
-	phy_set_mode_ext(xudc->utmi_phy, PHY_MODE_USB_OTG, USB_ROLE_DEVICE);
+	phy_set_mode_ext(xudc->curr_utmi_phy, PHY_MODE_USB_OTG,
+			 USB_ROLE_DEVICE);
 }
 
 static void tegra_xudc_device_mode_off(struct tegra_xudc *xudc)
@@ -627,7 +631,7 @@ static void tegra_xudc_device_mode_off(struct tegra_xudc *xudc)
 
 	reinit_completion(&xudc->disconnect_complete);
 
-	phy_set_mode_ext(xudc->utmi_phy, PHY_MODE_USB_OTG, USB_ROLE_NONE);
+	phy_set_mode_ext(xudc->curr_utmi_phy, PHY_MODE_USB_OTG, USB_ROLE_NONE);
 
 	pls = (xudc_readl(xudc, PORTSC) & PORTSC_PLS_MASK) >>
 		PORTSC_PLS_SHIFT;
@@ -652,11 +656,11 @@ static void tegra_xudc_device_mode_off(struct tegra_xudc *xudc)
 	/* Make sure interrupt handler has completed before powergating. */
 	synchronize_irq(xudc->irq);
 
-	err = phy_power_off(xudc->utmi_phy);
+	err = phy_power_off(xudc->curr_utmi_phy);
 	if (err < 0)
 		dev_err(xudc->dev, "utmi_phy power off failed %d\n", err);
 
-	err = phy_power_off(xudc->usb3_phy);
+	err = phy_power_off(xudc->curr_usb3_phy);
 	if (err < 0)
 		dev_err(xudc->dev, "usb3_phy power off failed %d\n", err);
 
@@ -674,12 +678,27 @@ static void tegra_xudc_usb_role_sw_work(struct work_struct *work)
 		tegra_xudc_device_mode_off(xudc);
 }
 
+static int tegra_xudc_get_phy_index(struct tegra_xudc *xudc,
+					      struct usb_phy *usbphy)
+{
+	unsigned int i;
+
+	for (i = 0; i < xudc->soc->num_phys; i++) {
+		if (xudc->usbphy[i] && usbphy == xudc->usbphy[i])
+			return i;
+	}
+
+	dev_info(xudc->dev, "phy index could not be found for shared USB PHY");
+	return -1;
+}
+
 static int tegra_xudc_vbus_notify(struct notifier_block *nb,
 					 unsigned long action, void *data)
 {
 	struct tegra_xudc *xudc = container_of(nb, struct tegra_xudc,
 					       vbus_nb);
 	struct usb_phy *usbphy = (struct usb_phy *)data;
+	int phy_index;
 
 	dev_dbg(xudc->dev, "%s(): event is %d\n", __func__, usbphy->last_event);
 
@@ -693,8 +712,15 @@ static int tegra_xudc_vbus_notify(struct notifier_block *nb,
 	xudc->device_mode = (usbphy->last_event == USB_EVENT_VBUS) ? true :
 								     false;
 
-	if (!xudc->suspended)
+	phy_index = tegra_xudc_get_phy_index(xudc, usbphy);
+	dev_dbg(xudc->dev, "%s(): current phy index is %d\n", __func__,
+		phy_index);
+
+	if (!xudc->suspended && phy_index != -1) {
+		xudc->curr_utmi_phy = xudc->utmi_phy[phy_index];
+		xudc->curr_usb3_phy = xudc->usb3_phy[phy_index];
 		schedule_work(&xudc->usb_role_sw_work);
+	}
 
 	return NOTIFY_OK;
 }
@@ -714,9 +740,9 @@ static void tegra_xudc_plc_reset_work(struct work_struct *work)
 
 		if (pls == PORTSC_PLS_INACTIVE) {
 			dev_info(xudc->dev, "PLS = Inactive. Toggle VBUS\n");
-			phy_set_mode_ext(xudc->utmi_phy, PHY_MODE_USB_OTG,
+			phy_set_mode_ext(xudc->curr_utmi_phy, PHY_MODE_USB_OTG,
 					 USB_ROLE_NONE);
-			phy_set_mode_ext(xudc->utmi_phy, PHY_MODE_USB_OTG,
+			phy_set_mode_ext(xudc->curr_utmi_phy, PHY_MODE_USB_OTG,
 					 USB_ROLE_DEVICE);
 
 			xudc->wait_csc = false;
@@ -745,7 +771,8 @@ static void tegra_xudc_port_reset_war_work(struct work_struct *work)
 		if (pls == PORTSC_PLS_DISABLED) {
 			dev_dbg(xudc->dev, "toggle vbus\n");
 			/* PRC doesn't complete in 100ms, toggle the vbus */
-			ret = tegra_phy_xusb_utmi_port_reset(xudc->utmi_phy);
+			ret = tegra_phy_xusb_utmi_port_reset(
+				xudc->curr_utmi_phy);
 			if (ret == 1)
 				xudc->wait_for_sec_prc = 0;
 		}
@@ -1934,6 +1961,7 @@ static int tegra_xudc_gadget_start(struct usb_gadget *gadget,
 	unsigned long flags;
 	u32 val;
 	int ret;
+	unsigned int i;
 
 	if (!driver)
 		return -EINVAL;
@@ -1969,8 +1997,9 @@ static int tegra_xudc_gadget_start(struct usb_gadget *gadget,
 		xudc_writel(xudc, val, CTRL);
 	}
 
-	if (xudc->usbphy)
-		otg_set_peripheral(xudc->usbphy->otg, gadget);
+	for (i = 0; i < xudc->soc->num_phys; i++)
+		if (xudc->usbphy[i])
+			otg_set_peripheral(xudc->usbphy[i]->otg, gadget);
 
 	xudc->driver = driver;
 unlock:
@@ -1987,13 +2016,15 @@ static int tegra_xudc_gadget_stop(struct usb_gadget *gadget)
 	struct tegra_xudc *xudc = to_xudc(gadget);
 	unsigned long flags;
 	u32 val;
+	unsigned int i;
 
 	pm_runtime_get_sync(xudc->dev);
 
 	spin_lock_irqsave(&xudc->lock, flags);
 
-	if (xudc->usbphy)
-		otg_set_peripheral(xudc->usbphy->otg, NULL);
+	for (i = 0; i < xudc->soc->num_phys; i++)
+		if (xudc->usbphy[i])
+			otg_set_peripheral(xudc->usbphy[i]->otg, NULL);
 
 	val = xudc_readl(xudc, CTRL);
 	val &= ~(CTRL_IE | CTRL_ENABLE);
@@ -3327,33 +3358,120 @@ static void tegra_xudc_device_params_init(struct tegra_xudc *xudc)
 	xudc_writel(xudc, val, CFG_DEV_SSPI_XFER);
 }
 
-static int tegra_xudc_phy_init(struct tegra_xudc *xudc)
+static int tegra_xudc_phy_get(struct tegra_xudc *xudc)
 {
-	int err;
+	int err = 0, usb3;
+	unsigned int i;
 
-	err = phy_init(xudc->utmi_phy);
-	if (err < 0) {
-		dev_err(xudc->dev, "utmi phy init failed: %d\n", err);
-		return err;
-	}
+	xudc->utmi_phy = devm_kcalloc(xudc->dev, xudc->soc->num_phys,
+					   sizeof(*xudc->utmi_phy), GFP_KERNEL);
+	if (!xudc->utmi_phy)
+		return -ENOMEM;
 
-	err = phy_init(xudc->usb3_phy);
-	if (err < 0) {
-		dev_err(xudc->dev, "usb3 phy init failed: %d\n", err);
-		goto exit_utmi_phy;
+	xudc->usb3_phy = devm_kcalloc(xudc->dev, xudc->soc->num_phys,
+					   sizeof(*xudc->usb3_phy), GFP_KERNEL);
+	if (!xudc->usb3_phy)
+		return -ENOMEM;
+
+	xudc->usbphy = devm_kcalloc(xudc->dev, xudc->soc->num_phys,
+					   sizeof(*xudc->usbphy), GFP_KERNEL);
+	if (!xudc->usbphy)
+		return -ENOMEM;
+
+	xudc->vbus_nb.notifier_call = tegra_xudc_vbus_notify;
+
+	for (i = 0; i < xudc->soc->num_phys; i++) {
+		char phy_name[] = "usb.-.";
+
+		/* Get USB2 phy */
+		snprintf(phy_name, sizeof(phy_name), "usb2-%d", i);
+		xudc->utmi_phy[i] = devm_phy_optional_get(xudc->dev, phy_name);
+		if (IS_ERR(xudc->utmi_phy[i])) {
+			err = PTR_ERR(xudc->utmi_phy[i]);
+			if (err != -EPROBE_DEFER)
+				dev_err(xudc->dev, "failed to get usb2-%d phy: %d\n",
+					i, err);
+
+			goto clean_up;
+		} else if (xudc->utmi_phy[i]) {
+			/* Get usb-phy, if utmi phy is available */
+			xudc->usbphy[i] = devm_usb_get_phy_by_node(xudc->dev,
+						xudc->utmi_phy[i]->dev.of_node,
+						&xudc->vbus_nb);
+			if (IS_ERR(xudc->usbphy[i])) {
+				err = PTR_ERR(xudc->usbphy[i]);
+				dev_err(xudc->dev, "failed to get usbphy-%d: %d\n",
+					i, err);
+				goto clean_up;
+			}
+		} else if (!xudc->utmi_phy[i]) {
+			/* if utmi phy is not available, ignore USB3 phy get */
+			continue;
+		}
+
+		/* Get USB3 phy */
+		usb3 = tegra_xusb_padctl_get_usb3_companion(xudc->padctl, i);
+		if (usb3 < 0)
+			continue;
+
+		snprintf(phy_name, sizeof(phy_name), "usb3-%d", usb3);
+		xudc->usb3_phy[i] = devm_phy_optional_get(xudc->dev, phy_name);
+		if (IS_ERR(xudc->usb3_phy[i])) {
+			err = PTR_ERR(xudc->usb3_phy[i]);
+			if (err != -EPROBE_DEFER)
+				dev_err(xudc->dev, "failed to get usb3-%d phy: %d\n",
+					usb3, err);
+
+			goto clean_up;
+		} else if (xudc->usb3_phy[i])
+			dev_dbg(xudc->dev, "usb3_phy-%d registered", usb3);
 	}
 
-	return 0;
+	return err;
+
+clean_up:
+	for (i = 0; i < xudc->soc->num_phys; i++) {
+		xudc->usb3_phy[i] = NULL;
+		xudc->utmi_phy[i] = NULL;
+		xudc->usbphy[i] = NULL;
+	}
 
-exit_utmi_phy:
-	phy_exit(xudc->utmi_phy);
 	return err;
 }
 
 static void tegra_xudc_phy_exit(struct tegra_xudc *xudc)
 {
-	phy_exit(xudc->usb3_phy);
-	phy_exit(xudc->utmi_phy);
+	unsigned int i;
+
+	for (i = 0; i < xudc->soc->num_phys; i++) {
+		phy_exit(xudc->usb3_phy[i]);
+		phy_exit(xudc->utmi_phy[i]);
+	}
+}
+
+static int tegra_xudc_phy_init(struct tegra_xudc *xudc)
+{
+	int err;
+	unsigned int i;
+
+	for (i = 0; i < xudc->soc->num_phys; i++) {
+		err = phy_init(xudc->utmi_phy[i]);
+		if (err < 0) {
+			dev_err(xudc->dev, "utmi phy init failed: %d\n", err);
+			goto exit_phy;
+		}
+
+		err = phy_init(xudc->usb3_phy[i]);
+		if (err < 0) {
+			dev_err(xudc->dev, "usb3 phy init failed: %d\n", err);
+			goto exit_phy;
+		}
+	}
+	return 0;
+
+exit_phy:
+	tegra_xudc_phy_exit(xudc);
+	return err;
 }
 
 static const char * const tegra210_xudc_supply_names[] = {
@@ -3381,6 +3499,7 @@ static struct tegra_xudc_soc tegra210_xudc_soc_data = {
 	.num_supplies = ARRAY_SIZE(tegra210_xudc_supply_names),
 	.clock_names = tegra210_xudc_clock_names,
 	.num_clks = ARRAY_SIZE(tegra210_xudc_clock_names),
+	.num_phys = 4,
 	.u1_enable = false,
 	.u2_enable = true,
 	.lpm_enable = false,
@@ -3393,6 +3512,7 @@ static struct tegra_xudc_soc tegra210_xudc_soc_data = {
 static struct tegra_xudc_soc tegra186_xudc_soc_data = {
 	.clock_names = tegra186_xudc_clock_names,
 	.num_clks = ARRAY_SIZE(tegra186_xudc_clock_names),
+	.num_phys = 4,
 	.u1_enable = true,
 	.u2_enable = true,
 	.lpm_enable = false,
@@ -3558,19 +3678,9 @@ static int tegra_xudc_probe(struct platform_device *pdev)
 		goto put_padctl;
 	}
 
-	xudc->usb3_phy = devm_phy_optional_get(&pdev->dev, "usb3");
-	if (IS_ERR(xudc->usb3_phy)) {
-		err = PTR_ERR(xudc->usb3_phy);
-		dev_err(xudc->dev, "failed to get usb3 phy: %d\n", err);
-		goto disable_regulator;
-	}
-
-	xudc->utmi_phy = devm_phy_optional_get(&pdev->dev, "usb2");
-	if (IS_ERR(xudc->utmi_phy)) {
-		err = PTR_ERR(xudc->utmi_phy);
-		dev_err(xudc->dev, "failed to get usb2 phy: %d\n", err);
+	err = tegra_xudc_phy_get(xudc);
+	if (err)
 		goto disable_regulator;
-	}
 
 	err = tegra_xudc_powerdomain_init(xudc);
 	if (err)
@@ -3599,16 +3709,6 @@ static int tegra_xudc_probe(struct platform_device *pdev)
 	INIT_DELAYED_WORK(&xudc->port_reset_war_work,
 				tegra_xudc_port_reset_war_work);
 
-	xudc->vbus_nb.notifier_call = tegra_xudc_vbus_notify;
-	xudc->usbphy = devm_usb_get_phy_by_node(xudc->dev,
-						xudc->utmi_phy->dev.of_node,
-						&xudc->vbus_nb);
-	if (IS_ERR(xudc->usbphy)) {
-		err = PTR_ERR(xudc->usbphy);
-		dev_err(xudc->dev, "failed to get USB PHY: %d\n", err);
-		goto free_eps;
-	}
-
 	pm_runtime_enable(&pdev->dev);
 
 	xudc->gadget.ops = &tegra_xudc_gadget_ops;
@@ -3643,6 +3743,7 @@ static int tegra_xudc_probe(struct platform_device *pdev)
 static int tegra_xudc_remove(struct platform_device *pdev)
 {
 	struct tegra_xudc *xudc = platform_get_drvdata(pdev);
+	unsigned int i;
 
 	pm_runtime_get_sync(xudc->dev);
 
@@ -3658,8 +3759,10 @@ static int tegra_xudc_remove(struct platform_device *pdev)
 
 	regulator_bulk_disable(xudc->soc->num_supplies, xudc->supplies);
 
-	phy_power_off(xudc->utmi_phy);
-	phy_power_off(xudc->usb3_phy);
+	for (i = 0; i < xudc->soc->num_phys; i++) {
+		phy_power_off(xudc->utmi_phy[i]);
+		phy_power_off(xudc->usb3_phy[i]);
+	}
 
 	tegra_xudc_phy_exit(xudc);
 
-- 
2.7.4