tegra hsic: Adding USB hsic driver support to K36

Adding hsic funtionality to USB2 instance.
Add the changes required for hsic functionality and
power management.

BUG 756184

Change-Id: Ife8a1fc6ea95b15f66d840b1565d858ee25d5ded
Reviewed-on: http://git-master/r/15192
Tested-by: Seshendra Gadagottu <sgadagottu@nvidia.com>
Reviewed-by: Michael Hsu <mhsu@nvidia.com>
Tested-by: Michael Hsu <mhsu@nvidia.com>
Reviewed-by: Shail Dave <sdave@nvidia.com>

1 files changed, 227 insertions, 43 deletions

diff --git a/drivers/usb/host/ehci-tegra.c b/drivers/usb/host/ehci-tegra.c
index 5765496218a1..a6dd7ac7dc42 100644
--- a/drivers/usb/host/ehci-tegra.c
+++ b/drivers/usb/host/ehci-tegra.c
@@ -2,7 +2,7 @@
  * EHCI-compliant USB host controller driver for NVIDIA Tegra SoCs
  *
  * Copyright (C) 2010 Google, Inc.
- * Copyright (C) 2009 NVIDIA Corporation
+ * Copyright (C) 2009 - 2011 NVIDIA Corporation
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License as published by the
@@ -57,6 +57,7 @@ struct tegra_ehci_hcd {
 	int port_resuming;
 	struct tegra_ehci_context context;
 	int power_down_on_bus_suspend;
+	struct delayed_work work;
 };
 
 static void tegra_ehci_power_up(struct usb_hcd *hcd)
@@ -89,11 +90,20 @@ static int tegra_ehci_hub_control(
 )
 {
 	struct ehci_hcd	*ehci = hcd_to_ehci(hcd);
-	struct tegra_ehci_hcd *tegra = dev_get_drvdata(hcd->self.controller);
-	u32 __iomem	*status_reg;
-	u32		temp;
+	int		ports = HCS_N_PORTS(ehci->hcs_params);
+	u32 __iomem	*status_reg = &ehci->regs->port_status[
+				(wIndex & 0xff) - 1];
+	u32		temp, status;
 	unsigned long	flags;
 	int		retval = 0;
+	unsigned	selector;
+	struct		tegra_ehci_hcd *tegra = dev_get_drvdata(hcd->self.controller);
+	bool		hsic = false;
+
+	if (tegra->phy->instance == 1) {
+		struct tegra_ulpi_config *config = tegra->phy->config;
+		hsic = (config->inf_type == TEGRA_USB_UHSIC);
+	}
 
 	status_reg = &ehci->regs->port_status[(wIndex & 0xff) - 1];
 
@@ -108,18 +118,14 @@ static int tegra_ehci_hub_control(
 		temp = ehci_readl(ehci, status_reg);
 		ehci_writel(ehci, (temp & ~PORT_RWC_BITS) & ~PORT_PE, status_reg);
 		goto done;
-	}
-
-	else if (typeReq == GetPortStatus) {
+	} else if (typeReq == GetPortStatus) {
 		temp = ehci_readl(ehci, status_reg);
 		if (tegra->port_resuming && !(temp & PORT_SUSPEND)) {
 			/* resume completed */
 			tegra->port_resuming = 0;
 			tegra_usb_phy_postresume(tegra->phy);
 		}
-	}
-
-	else if (typeReq == SetPortFeature && wValue == USB_PORT_FEAT_SUSPEND) {
+	} else if (typeReq == SetPortFeature && wValue == USB_PORT_FEAT_SUSPEND) {
 		temp = ehci_readl(ehci, status_reg);
 		if ((temp & PORT_PE) == 0 || (temp & PORT_RESET) != 0) {
 			retval = -EPIPE;
@@ -127,9 +133,9 @@ static int tegra_ehci_hub_control(
 		}
 
 		/* After above check the port must be connected.
-		 * Set appropriate bit thus could put phy into low power
-		 * mode if we have hostpc feature
-		 */
+		* Set appropriate bit thus could put phy into low power
+		* mode if we have hostpc feature
+		*/
 		temp &= ~PORT_WKCONN_E;
 		temp |= PORT_WKDISC_E | PORT_WKOC_E;
 		ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
@@ -141,12 +147,13 @@ static int tegra_ehci_hub_control(
 	}
 
 	/*
-	 * Tegra host controller will time the resume operation to clear the bit
-	 * when the port control state switches to HS or FS Idle. This behavior
-	 * is different from EHCI where the host controller driver is required
-	 * to set this bit to a zero after the resume duration is timed in the
-	 * driver.
-	 */
+	* Tegra host controller will time the resume operation to clear the bit
+	* when the port control state switches to HS or FS Idle. This behavior
+	* is different from EHCI where the host controller driver is required
+	* to set this bit to a zero after the resume duration is timed in the
+	* driver.
+	*/
+
 	else if (typeReq == ClearPortFeature && wValue == USB_PORT_FEAT_SUSPEND) {
 		temp = ehci_readl(ehci, status_reg);
 		if ((temp & PORT_RESET) || !(temp & PORT_PE)) {
@@ -183,6 +190,65 @@ static int tegra_ehci_hub_control(
 		goto done;
 	}
 
+	/* Handle port reset here */
+	if ((hsic) && (typeReq == SetPortFeature) &&
+		((wValue == USB_PORT_FEAT_RESET) || (wValue == USB_PORT_FEAT_POWER))) {
+		selector = wIndex >> 8;
+		wIndex &= 0xff;
+		if (!wIndex || wIndex > ports) {
+			retval = -EPIPE;
+			goto done;
+		}
+		wIndex--;
+		status = 0;
+		temp = ehci_readl(ehci, status_reg);
+		if (temp & PORT_OWNER)
+			goto done;
+		temp &= ~PORT_RWC_BITS;
+
+		switch (wValue) {
+		case USB_PORT_FEAT_RESET:
+		{
+			if (temp & PORT_RESUME) {
+				retval = -EPIPE;
+				goto done;
+			}
+			/* line status bits may report this as low speed,
+			* which can be fine if this root hub has a
+			* transaction translator built in.
+			*/
+			if ((temp & (PORT_PE|PORT_CONNECT)) == PORT_CONNECT
+					&& !ehci_is_TDI(ehci) && PORT_USB11 (temp)) {
+				ehci_dbg (ehci, "port %d low speed --> companion\n", wIndex + 1);
+				temp |= PORT_OWNER;
+				ehci_writel(ehci, temp, status_reg);
+			} else {
+				ehci_vdbg(ehci, "port %d reset\n", wIndex + 1);
+				temp &= ~PORT_PE;
+				/*
+				* caller must wait, then call GetPortStatus
+				* usb 2.0 spec says 50 ms resets on root
+				*/
+				ehci->reset_done[wIndex] = jiffies + msecs_to_jiffies(50);
+				ehci_writel(ehci, temp, status_reg);
+				if (hsic && (wIndex == 0))
+					tegra_usb_phy_bus_reset(tegra->phy);
+			}
+
+			break;
+		}
+		case USB_PORT_FEAT_POWER:
+		{
+			if (HCS_PPC(ehci->hcs_params))
+				ehci_writel(ehci, temp | PORT_POWER, status_reg);
+			if (hsic && (wIndex == 0))
+				tegra_usb_phy_bus_connect(tegra->phy);
+			break;
+		}
+		}
+		goto done;
+	}
+
 	spin_unlock_irqrestore(&ehci->lock, flags);
 
 	/* Handle the hub control events here */
@@ -197,16 +263,16 @@ static void tegra_ehci_restart(struct usb_hcd *hcd)
 	unsigned int temp;
 	struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 
-	/* reset the ehci controller */
-	ehci->controller_resets_phy = 0;
-	ehci_reset(ehci);
-	ehci->controller_resets_phy = 1;
-
 	/* Set to Host mode by setting bit 0-1 of USB device mode register */
 	temp = readl(hcd->regs + TEGRA_USB_USBMODE_REG_OFFSET);
 	writel((temp | TEGRA_USB_USBMODE_HOST),
 		(hcd->regs + TEGRA_USB_USBMODE_REG_OFFSET));
 
+	/* reset the ehci controller */
+	ehci->controller_resets_phy = 0;
+	ehci_reset(ehci);
+	ehci->controller_resets_phy = 1;
+
 	/* setup the frame list and Async q heads */
 	ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
 	ehci_writel(ehci, (u32)ehci->async->qh_dma, &ehci->regs->async_next);
@@ -215,7 +281,14 @@ static void tegra_ehci_restart(struct usb_hcd *hcd)
 	ehci->command |= CMD_RUN;
 	ehci_writel(ehci, ehci->command, &ehci->regs->command);
 
+	/* Enable the root Port Power */
+	if (HCS_PPC(ehci->hcs_params)) {
+		temp = ehci_readl(ehci, &ehci->regs->port_status[0]);
+		ehci_writel(ehci, temp | PORT_POWER, &ehci->regs->port_status[0]);
+	}
+
 	down_write(&ehci_cf_port_reset_rwsem);
+	hcd->state = HC_STATE_RUNNING;
 	ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
 	/* flush posted writes */
 	ehci_readl(ehci, &ehci->regs->command);
@@ -228,12 +301,19 @@ static int tegra_usb_suspend(struct usb_hcd *hcd)
 	struct ehci_regs __iomem *hw = tegra->ehci->regs;
 	struct tegra_ehci_context *context = &tegra->context;
 	unsigned long flags;
+	int hsic = 0;
+	struct tegra_ulpi_config *config;
+
+	if (tegra->phy->instance == 1) {
+		config = tegra->phy->config;
+		hsic = (config->inf_type == TEGRA_USB_UHSIC);
+	}
 
 	spin_lock_irqsave(&tegra->ehci->lock, flags);
 
 	context->port_speed = (readl(&hw->port_status[0]) >> 26) & 0x3;
 
-	if (context->port_speed > TEGRA_USB_PHY_PORT_HIGH) {
+	if ((context->port_speed > TEGRA_USB_PHY_PORT_HIGH) || hsic) {
 		/* If no device connection or invalid speeds,
 		 * don't save the context */
 		context->valid = false;
@@ -259,12 +339,19 @@ static int tegra_usb_resume(struct usb_hcd *hcd)
 {
 	struct tegra_ehci_hcd *tegra = dev_get_drvdata(hcd->self.controller);
 	struct tegra_ehci_context *context = &tegra->context;
+	struct usb_device *udev = hcd->self.root_hub;
 	struct ehci_regs __iomem *hw = tegra->ehci->regs;
 	unsigned long val;
 	int lp0_resume = 0;
+	int hsic = 0;
+	struct tegra_ulpi_config *config;
 
-	set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
+	if (tegra->phy->instance == 1) {
+		config = tegra->phy->config;
+		hsic = (config->inf_type == TEGRA_USB_UHSIC);
+	}
 	tegra_ehci_power_up(ehci_to_hcd(tegra->ehci));
+	set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
 
 	if (!context->valid) {
 		/* Wait for the phy to detect new devices
@@ -355,8 +442,19 @@ static int tegra_usb_resume(struct usb_hcd *hcd)
 restart:
 	if (context->valid)
 		tegra_ehci_phy_restore_end(tegra->phy);
+	if (hsic) {
+		val = readl(&hw->port_status[0]);
+		if (!((val & PORT_POWER) && (val & PORT_PE))) {
+			tegra_ehci_restart(hcd);
+			usb_set_device_state(udev, USB_STATE_CONFIGURED);
+		}
+		tegra_usb_phy_bus_idle(tegra->phy);
+		if (!tegra_usb_phy_is_device_connected(tegra->phy))
+			schedule_delayed_work(&tegra->work, 50);
+	} else {
+		tegra_ehci_restart(hcd);
+	}
 
-	tegra_ehci_restart(hcd);
 	return 0;
 }
 
@@ -456,7 +554,6 @@ static int tegra_ehci_bus_suspend(struct usb_hcd *hcd)
 		tegra_usb_suspend(hcd);
 		tegra->bus_suspended = 1;
 	}
-
 	return error_status;
 }
 
@@ -476,7 +573,7 @@ static int tegra_ehci_bus_resume(struct usb_hcd *hcd)
 #endif
 
 struct temp_buffer {
-        void *kmalloc_ptr;
+	void *kmalloc_ptr;
 	void *old_xfer_buffer;
 	u8 data[0];
 };
@@ -492,14 +589,13 @@ static void free_temp_buffer(struct urb *urb)
 	dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
 
 	temp = container_of(urb->transfer_buffer, struct temp_buffer,
-			    data);
+								data);
 
 	if (dir == DMA_FROM_DEVICE)
 		memcpy(temp->old_xfer_buffer, temp->data,
-		       urb->transfer_buffer_length);
+			urb->transfer_buffer_length);
 	urb->transfer_buffer = temp->old_xfer_buffer;
 	kfree(temp->kmalloc_ptr);
-
 	urb->transfer_flags &= ~URB_ALIGNED_TEMP_BUFFER;
 }
 
@@ -507,13 +603,12 @@ static int alloc_temp_buffer(struct urb *urb, gfp_t mem_flags)
 {
 	enum dma_data_direction dir;
 	struct temp_buffer *temp, *kmalloc_ptr;
-        size_t kmalloc_size;
-	void *data;
+	size_t kmalloc_size;
 
 	if (urb->num_sgs || urb->sg ||
-	    urb->transfer_buffer_length == 0 ||
-	    !((uintptr_t)urb->transfer_buffer & (TEGRA_USB_DMA_ALIGN - 1)))
-		return 0;
+		urb->transfer_buffer_length == 0 ||
+		!((uintptr_t)urb->transfer_buffer & (TEGRA_USB_DMA_ALIGN - 1)))
+	return 0;
 
 	dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
 
@@ -532,17 +627,17 @@ static int alloc_temp_buffer(struct urb *urb, gfp_t mem_flags)
 	temp->old_xfer_buffer = urb->transfer_buffer;
 	if (dir == DMA_TO_DEVICE)
 		memcpy(temp->data, urb->transfer_buffer,
-		       urb->transfer_buffer_length);
+	urb->transfer_buffer_length);
 	urb->transfer_buffer = temp->data;
 
-        BUILD_BUG_ON(!(URB_ALIGNED_TEMP_BUFFER & URB_DRIVER_PRIVATE));
+	BUILD_BUG_ON(!(URB_ALIGNED_TEMP_BUFFER & URB_DRIVER_PRIVATE));
 	urb->transfer_flags |= URB_ALIGNED_TEMP_BUFFER;
 
 	return 0;
 }
 
 static int tegra_ehci_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
-				      gfp_t mem_flags)
+					gfp_t mem_flags)
 {
 	int ret;
 
@@ -553,7 +648,6 @@ static int tegra_ehci_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
 	ret = usb_hcd_map_urb_for_dma(hcd, urb, mem_flags);
 	if (ret)
 		free_temp_buffer(urb);
-
 	return ret;
 }
 
@@ -563,6 +657,76 @@ static void tegra_ehci_unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
 	free_temp_buffer(urb);
 }
 
+static void tegra_hsic_connection_work(struct work_struct *work)
+{
+	struct tegra_ehci_hcd *tegra =
+		container_of(work, struct tegra_ehci_hcd, work.work);
+	if (tegra_usb_phy_is_device_connected(tegra->phy)) {
+		cancel_delayed_work(&tegra->work);
+		return;
+	}
+	schedule_delayed_work(&tegra->work, jiffies + msecs_to_jiffies(50));
+	return;
+}
+
+
+
+#ifdef CONFIG_USB_EHCI_ONOFF_FEATURE
+struct usb_hcd *ehci_handle; /* For ehci on/off sysfs */
+int ehci_tegra_irq;
+
+static ssize_t show_ehci_power(struct device *dev,
+			struct device_attribute *attr,
+			char *buf)
+{
+	return sprintf(buf, "EHCI Power %s\n", (ehci_handle) ? "on" : "off");
+}
+
+static ssize_t store_ehci_power(struct device *dev,
+		struct device_attribute *attr,
+		const char *buf, size_t count)
+{
+	int power_on;
+	int retval;
+	struct tegra_ehci_hcd *tegra = dev_get_drvdata(dev);
+	struct usb_hcd *hcd = ehci_to_hcd(tegra->ehci);
+
+	if (sscanf(buf, "%d", &power_on) != 1)
+		return -EINVAL;
+
+	if (power_on == 0 && ehci_handle != NULL) {
+		usb_remove_hcd(hcd);
+		tegra_ehci_power_down(hcd);
+		ehci_handle = NULL;
+	} else if (power_on == 1) {
+		if (ehci_handle)
+			usb_remove_hcd(hcd);
+		tegra_ehci_power_up(hcd);
+		retval = usb_add_hcd(hcd, ehci_tegra_irq,
+					IRQF_DISABLED | IRQF_SHARED);
+		if (retval < 0)
+			printk(KERN_ERR "power_on error\n");
+		ehci_handle = hcd;
+	}
+
+	return count;
+}
+
+static DEVICE_ATTR(ehci_power, 0666, show_ehci_power, store_ehci_power);
+
+static inline int create_ehci_sys_file(struct ehci_hcd *ehci)
+{
+	return device_create_file(ehci_to_hcd(ehci)->self.controller,
+							&dev_attr_ehci_power);
+}
+
+static inline void remove_ehci_sys_file(struct ehci_hcd *ehci)
+{
+	device_remove_file(ehci_to_hcd(ehci)->self.controller,
+						&dev_attr_ehci_power);
+}
+#endif
+
 static const struct hc_driver tegra_ehci_hc_driver = {
 	.description		= hcd_name,
 	.product_desc		= "Tegra EHCI Host Controller",
@@ -664,6 +828,8 @@ static int tegra_ehci_probe(struct platform_device *pdev)
 
 	config = pdata->phy_config;
 
+	INIT_DELAYED_WORK(&tegra->work, tegra_hsic_connection_work);
+
 	tegra->phy = tegra_usb_phy_open(instance, hcd->regs, config,
 						TEGRA_USB_PHY_MODE_HOST);
 	if (IS_ERR(tegra->phy)) {
@@ -694,6 +860,12 @@ static int tegra_ehci_probe(struct platform_device *pdev)
 	ehci = hcd_to_ehci(hcd);
 	tegra->ehci = ehci;
 
+#ifdef CONFIG_USB_EHCI_ONOFF_FEATURE
+	if (instance == 1) {
+		ehci_tegra_irq = irq;
+		create_ehci_sys_file(ehci);
+	}
+#endif
 #ifdef CONFIG_USB_OTG_UTILS
 	if (pdata->operating_mode == TEGRA_USB_OTG) {
 		tegra->transceiver = otg_get_transceiver();
@@ -708,6 +880,10 @@ static int tegra_ehci_probe(struct platform_device *pdev)
 		goto fail;
 	}
 
+#ifdef CONFIG_USB_EHCI_ONOFF_FEATURE
+	if (instance == 1)
+		ehci_handle = hcd;
+#endif
 	return err;
 
 fail:
@@ -740,7 +916,7 @@ static int tegra_ehci_resume(struct platform_device *pdev)
 	struct tegra_ehci_hcd *tegra = platform_get_drvdata(pdev);
 	struct usb_hcd *hcd = ehci_to_hcd(tegra->ehci);
 
-	if (tegra->bus_suspended)
+	if ((tegra->bus_suspended) && (tegra->power_down_on_bus_suspend))
 		return 0;
 
 	return tegra_usb_resume(hcd);
@@ -751,7 +927,7 @@ static int tegra_ehci_suspend(struct platform_device *pdev, pm_message_t state)
 	struct tegra_ehci_hcd *tegra = platform_get_drvdata(pdev);
 	struct usb_hcd *hcd = ehci_to_hcd(tegra->ehci);
 
-	if (tegra->bus_suspended)
+	if ((tegra->bus_suspended) && (tegra->power_down_on_bus_suspend))
 		return 0;
 
 	if (time_before(jiffies, tegra->ehci->next_statechange))
@@ -776,11 +952,19 @@ static int tegra_ehci_remove(struct platform_device *pdev)
 	}
 #endif
 
+#ifdef CONFIG_USB_EHCI_ONOFF_FEATURE
+	if (tegra->phy->instance == 1) {
+		remove_ehci_sys_file(hcd_to_ehci(hcd));
+		ehci_handle = NULL;
+	}
+#endif
+
 	/* Turn Off Interrupts */
 	ehci_writel(tegra->ehci, 0, &tegra->ehci->regs->intr_enable);
 	clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
 	usb_remove_hcd(hcd);
 	usb_put_hcd(hcd);
+	cancel_delayed_work(&tegra->work);
 	tegra_usb_phy_power_off(tegra->phy);
 	tegra_usb_phy_close(tegra->phy);
 	iounmap(hcd->regs);