1 files changed, 486 insertions, 0 deletions

diff --git a/drivers/usb/chipidea/host.c b/drivers/usb/chipidea/host.c
new file mode 100644
index 000000000..34bbdfadd
--- /dev/null
+++ b/drivers/usb/chipidea/host.c
@@ -0,0 +1,486 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * host.c - ChipIdea USB host controller driver
+ *
+ * Copyright (c) 2012 Intel Corporation
+ *
+ * Author: Alexander Shishkin
+ */
+
+#include <linux/kernel.h>
+#include <linux/io.h>
+#include <linux/usb.h>
+#include <linux/usb/hcd.h>
+#include <linux/usb/chipidea.h>
+#include <linux/regulator/consumer.h>
+#include <linux/pinctrl/consumer.h>
+
+#include "../host/ehci.h"
+
+#include "ci.h"
+#include "bits.h"
+#include "host.h"
+
+static struct hc_driver __read_mostly ci_ehci_hc_driver;
+static int (*orig_bus_suspend)(struct usb_hcd *hcd);
+
+struct ehci_ci_priv {
+	struct regulator *reg_vbus;
+	bool enabled;
+};
+
+struct ci_hdrc_dma_aligned_buffer {
+	void *original_buffer;
+	u8 data[];
+};
+
+static int ehci_ci_portpower(struct usb_hcd *hcd, int portnum, bool enable)
+{
+	struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+	struct ehci_ci_priv *priv = (struct ehci_ci_priv *)ehci->priv;
+	struct device *dev = hcd->self.controller;
+	struct ci_hdrc *ci = dev_get_drvdata(dev);
+	int ret = 0;
+	int port = HCS_N_PORTS(ehci->hcs_params);
+
+	if (priv->reg_vbus && enable != priv->enabled) {
+		if (port > 1) {
+			dev_warn(dev,
+				"Not support multi-port regulator control\n");
+			return 0;
+		}
+		if (enable)
+			ret = regulator_enable(priv->reg_vbus);
+		else
+			ret = regulator_disable(priv->reg_vbus);
+		if (ret) {
+			dev_err(dev,
+				"Failed to %s vbus regulator, ret=%d\n",
+				enable ? "enable" : "disable", ret);
+			return ret;
+		}
+		priv->enabled = enable;
+	}
+
+	if (ci->platdata->flags & CI_HDRC_PHY_VBUS_CONTROL) {
+		if (enable)
+			usb_phy_vbus_on(ci->usb_phy);
+		else
+			usb_phy_vbus_off(ci->usb_phy);
+	}
+
+	if (enable && (ci->platdata->phy_mode == USBPHY_INTERFACE_MODE_HSIC)) {
+		/*
+		 * Marvell 28nm HSIC PHY requires forcing the port to HS mode.
+		 * As HSIC is always HS, this should be safe for others.
+		 */
+		hw_port_test_set(ci, 5);
+		hw_port_test_set(ci, 0);
+	}
+	return 0;
+};
+
+static int ehci_ci_reset(struct usb_hcd *hcd)
+{
+	struct device *dev = hcd->self.controller;
+	struct ci_hdrc *ci = dev_get_drvdata(dev);
+	struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+	int ret;
+
+	ret = ehci_setup(hcd);
+	if (ret)
+		return ret;
+
+	ehci->need_io_watchdog = 0;
+
+	if (ci->platdata->notify_event) {
+		ret = ci->platdata->notify_event(ci,
+				CI_HDRC_CONTROLLER_RESET_EVENT);
+		if (ret)
+			return ret;
+	}
+
+	ci_platform_configure(ci);
+
+	return ret;
+}
+
+static const struct ehci_driver_overrides ehci_ci_overrides = {
+	.extra_priv_size = sizeof(struct ehci_ci_priv),
+	.port_power	 = ehci_ci_portpower,
+	.reset		 = ehci_ci_reset,
+};
+
+static irqreturn_t host_irq(struct ci_hdrc *ci)
+{
+	return usb_hcd_irq(ci->irq, ci->hcd);
+}
+
+static int host_start(struct ci_hdrc *ci)
+{
+	struct usb_hcd *hcd;
+	struct ehci_hcd *ehci;
+	struct ehci_ci_priv *priv;
+	int ret;
+
+	if (usb_disabled())
+		return -ENODEV;
+
+	hcd = __usb_create_hcd(&ci_ehci_hc_driver, ci->dev->parent,
+			       ci->dev, dev_name(ci->dev), NULL);
+	if (!hcd)
+		return -ENOMEM;
+
+	dev_set_drvdata(ci->dev, ci);
+	hcd->rsrc_start = ci->hw_bank.phys;
+	hcd->rsrc_len = ci->hw_bank.size;
+	hcd->regs = ci->hw_bank.abs;
+	hcd->has_tt = 1;
+
+	hcd->power_budget = ci->platdata->power_budget;
+	hcd->tpl_support = ci->platdata->tpl_support;
+	if (ci->phy || ci->usb_phy) {
+		hcd->skip_phy_initialization = 1;
+		if (ci->usb_phy)
+			hcd->usb_phy = ci->usb_phy;
+	}
+
+	ehci = hcd_to_ehci(hcd);
+	ehci->caps = ci->hw_bank.cap;
+	ehci->has_hostpc = ci->hw_bank.lpm;
+	ehci->has_tdi_phy_lpm = ci->hw_bank.lpm;
+	ehci->imx28_write_fix = ci->imx28_write_fix;
+	ehci->has_ci_pec_bug = ci->has_portsc_pec_bug;
+
+	priv = (struct ehci_ci_priv *)ehci->priv;
+	priv->reg_vbus = NULL;
+
+	if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci)) {
+		if (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON) {
+			ret = regulator_enable(ci->platdata->reg_vbus);
+			if (ret) {
+				dev_err(ci->dev,
+				"Failed to enable vbus regulator, ret=%d\n",
+									ret);
+				goto put_hcd;
+			}
+		} else {
+			priv->reg_vbus = ci->platdata->reg_vbus;
+		}
+	}
+
+	if (ci->platdata->pins_host)
+		pinctrl_select_state(ci->platdata->pctl,
+				     ci->platdata->pins_host);
+
+	ci->hcd = hcd;
+
+	ret = usb_add_hcd(hcd, 0, 0);
+	if (ret) {
+		ci->hcd = NULL;
+		goto disable_reg;
+	} else {
+		struct usb_otg *otg = &ci->otg;
+
+		if (ci_otg_is_fsm_mode(ci)) {
+			otg->host = &hcd->self;
+			hcd->self.otg_port = 1;
+		}
+
+		if (ci->platdata->notify_event &&
+			(ci->platdata->flags & CI_HDRC_IMX_IS_HSIC))
+			ci->platdata->notify_event
+				(ci, CI_HDRC_IMX_HSIC_ACTIVE_EVENT);
+	}
+
+	return ret;
+
+disable_reg:
+	if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci) &&
+			(ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON))
+		regulator_disable(ci->platdata->reg_vbus);
+put_hcd:
+	usb_put_hcd(hcd);
+
+	return ret;
+}
+
+static void host_stop(struct ci_hdrc *ci)
+{
+	struct usb_hcd *hcd = ci->hcd;
+
+	if (hcd) {
+		if (ci->platdata->notify_event)
+			ci->platdata->notify_event(ci,
+				CI_HDRC_CONTROLLER_STOPPED_EVENT);
+		usb_remove_hcd(hcd);
+		ci->role = CI_ROLE_END;
+		synchronize_irq(ci->irq);
+		usb_put_hcd(hcd);
+		if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci) &&
+			(ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON))
+				regulator_disable(ci->platdata->reg_vbus);
+	}
+	ci->hcd = NULL;
+	ci->otg.host = NULL;
+
+	if (ci->platdata->pins_host && ci->platdata->pins_default)
+		pinctrl_select_state(ci->platdata->pctl,
+				     ci->platdata->pins_default);
+}
+
+
+void ci_hdrc_host_destroy(struct ci_hdrc *ci)
+{
+	if (ci->role == CI_ROLE_HOST && ci->hcd)
+		host_stop(ci);
+}
+
+/* The below code is based on tegra ehci driver */
+static int ci_ehci_hub_control(
+	struct usb_hcd	*hcd,
+	u16		typeReq,
+	u16		wValue,
+	u16		wIndex,
+	char		*buf,
+	u16		wLength
+)
+{
+	struct ehci_hcd	*ehci = hcd_to_ehci(hcd);
+	unsigned int	ports = HCS_N_PORTS(ehci->hcs_params);
+	u32 __iomem	*status_reg;
+	u32		temp, port_index;
+	unsigned long	flags;
+	int		retval = 0;
+	bool		done = false;
+	struct device *dev = hcd->self.controller;
+	struct ci_hdrc *ci = dev_get_drvdata(dev);
+
+	port_index = wIndex & 0xff;
+	port_index -= (port_index > 0);
+	status_reg = &ehci->regs->port_status[port_index];
+
+	spin_lock_irqsave(&ehci->lock, flags);
+
+	if (ci->platdata->hub_control) {
+		retval = ci->platdata->hub_control(ci, typeReq, wValue, wIndex,
+						   buf, wLength, &done, &flags);
+		if (done)
+			goto done;
+	}
+
+	if (typeReq == SetPortFeature && wValue == USB_PORT_FEAT_SUSPEND) {
+		if (!wIndex || wIndex > ports) {
+			retval = -EPIPE;
+			goto done;
+		}
+
+		temp = ehci_readl(ehci, status_reg);
+		if ((temp & PORT_PE) == 0 || (temp & PORT_RESET) != 0) {
+			retval = -EPIPE;
+			goto done;
+		}
+
+		temp &= ~(PORT_RWC_BITS | PORT_WKCONN_E);
+		temp |= PORT_WKDISC_E | PORT_WKOC_E;
+		ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
+
+		/*
+		 * If a transaction is in progress, there may be a delay in
+		 * suspending the port. Poll until the port is suspended.
+		 */
+		if (ehci_handshake(ehci, status_reg, PORT_SUSPEND,
+			PORT_SUSPEND, 5000))
+			ehci_err(ehci, "timeout waiting for SUSPEND\n");
+
+		if (ci->platdata->flags & CI_HDRC_IMX_IS_HSIC) {
+			if (ci->platdata->notify_event)
+				ci->platdata->notify_event(ci,
+					CI_HDRC_IMX_HSIC_SUSPEND_EVENT);
+
+			temp = ehci_readl(ehci, status_reg);
+			temp &= ~(PORT_WKDISC_E | PORT_WKCONN_E);
+			ehci_writel(ehci, temp, status_reg);
+		}
+
+		set_bit(port_index, &ehci->suspended_ports);
+		goto done;
+	}
+
+	/*
+	 * After resume has finished, it needs do some post resume
+	 * operation for some SoCs.
+	 */
+	else if (typeReq == ClearPortFeature &&
+		wValue == USB_PORT_FEAT_C_SUSPEND) {
+		/* Make sure the resume has finished, it should be finished */
+		if (ehci_handshake(ehci, status_reg, PORT_RESUME, 0, 25000))
+			ehci_err(ehci, "timeout waiting for resume\n");
+	}
+
+	spin_unlock_irqrestore(&ehci->lock, flags);
+
+	/* Handle the hub control events here */
+	return ehci_hub_control(hcd, typeReq, wValue, wIndex, buf, wLength);
+done:
+	spin_unlock_irqrestore(&ehci->lock, flags);
+	return retval;
+}
+static int ci_ehci_bus_suspend(struct usb_hcd *hcd)
+{
+	struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+	struct device *dev = hcd->self.controller;
+	struct ci_hdrc *ci = dev_get_drvdata(dev);
+	int port;
+	u32 tmp;
+
+	int ret = orig_bus_suspend(hcd);
+
+	if (ret)
+		return ret;
+
+	port = HCS_N_PORTS(ehci->hcs_params);
+	while (port--) {
+		u32 __iomem *reg = &ehci->regs->port_status[port];
+		u32 portsc = ehci_readl(ehci, reg);
+
+		if (portsc & PORT_CONNECT) {
+			/*
+			 * For chipidea, the resume signal will be ended
+			 * automatically, so for remote wakeup case, the
+			 * usbcmd.rs may not be set before the resume has
+			 * ended if other resume paths consumes too much
+			 * time (~24ms), in that case, the SOF will not
+			 * send out within 3ms after resume ends, then the
+			 * high speed device will enter full speed mode.
+			 */
+
+			tmp = ehci_readl(ehci, &ehci->regs->command);
+			tmp |= CMD_RUN;
+			ehci_writel(ehci, tmp, &ehci->regs->command);
+			/*
+			 * It needs a short delay between set RS bit and PHCD.
+			 */
+			usleep_range(150, 200);
+			/*
+			 * Need to clear WKCN and WKOC for imx HSIC,
+			 * otherwise, there will be wakeup event.
+			 */
+			if (ci->platdata->flags & CI_HDRC_IMX_IS_HSIC) {
+				tmp = ehci_readl(ehci, reg);
+				tmp &= ~(PORT_WKDISC_E | PORT_WKCONN_E);
+				ehci_writel(ehci, tmp, reg);
+			}
+
+			break;
+		}
+	}
+
+	return 0;
+}
+
+static void ci_hdrc_free_dma_aligned_buffer(struct urb *urb, bool copy_back)
+{
+	struct ci_hdrc_dma_aligned_buffer *temp;
+
+	if (!(urb->transfer_flags & URB_ALIGNED_TEMP_BUFFER))
+		return;
+	urb->transfer_flags &= ~URB_ALIGNED_TEMP_BUFFER;
+
+	temp = container_of(urb->transfer_buffer,
+			    struct ci_hdrc_dma_aligned_buffer, data);
+	urb->transfer_buffer = temp->original_buffer;
+
+	if (copy_back && usb_urb_dir_in(urb)) {
+		size_t length;
+
+		if (usb_pipeisoc(urb->pipe))
+			length = urb->transfer_buffer_length;
+		else
+			length = urb->actual_length;
+
+		memcpy(temp->original_buffer, temp->data, length);
+	}
+
+	kfree(temp);
+}
+
+static int ci_hdrc_alloc_dma_aligned_buffer(struct urb *urb, gfp_t mem_flags)
+{
+	struct ci_hdrc_dma_aligned_buffer *temp;
+
+	if (urb->num_sgs || urb->sg || urb->transfer_buffer_length == 0)
+		return 0;
+	if (IS_ALIGNED((uintptr_t)urb->transfer_buffer, 4)
+	    && IS_ALIGNED(urb->transfer_buffer_length, 4))
+		return 0;
+
+	temp = kmalloc(sizeof(*temp) + ALIGN(urb->transfer_buffer_length, 4), mem_flags);
+	if (!temp)
+		return -ENOMEM;
+
+	if (usb_urb_dir_out(urb))
+		memcpy(temp->data, urb->transfer_buffer,
+		       urb->transfer_buffer_length);
+
+	temp->original_buffer = urb->transfer_buffer;
+	urb->transfer_buffer = temp->data;
+	urb->transfer_flags |= URB_ALIGNED_TEMP_BUFFER;
+
+	return 0;
+}
+
+static int ci_hdrc_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
+				   gfp_t mem_flags)
+{
+	int ret;
+
+	ret = ci_hdrc_alloc_dma_aligned_buffer(urb, mem_flags);
+	if (ret)
+		return ret;
+
+	ret = usb_hcd_map_urb_for_dma(hcd, urb, mem_flags);
+	if (ret)
+		ci_hdrc_free_dma_aligned_buffer(urb, false);
+
+	return ret;
+}
+
+static void ci_hdrc_unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
+{
+	usb_hcd_unmap_urb_for_dma(hcd, urb);
+	ci_hdrc_free_dma_aligned_buffer(urb, true);
+}
+
+int ci_hdrc_host_init(struct ci_hdrc *ci)
+{
+	struct ci_role_driver *rdrv;
+
+	if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_HC))
+		return -ENXIO;
+
+	rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL);
+	if (!rdrv)
+		return -ENOMEM;
+
+	rdrv->start	= host_start;
+	rdrv->stop	= host_stop;
+	rdrv->irq	= host_irq;
+	rdrv->name	= "host";
+	ci->roles[CI_ROLE_HOST] = rdrv;
+
+	if (ci->platdata->flags & CI_HDRC_REQUIRES_ALIGNED_DMA) {
+		ci_ehci_hc_driver.map_urb_for_dma = ci_hdrc_map_urb_for_dma;
+		ci_ehci_hc_driver.unmap_urb_for_dma = ci_hdrc_unmap_urb_for_dma;
+	}
+
+	return 0;
+}
+
+void ci_hdrc_host_driver_init(void)
+{
+	ehci_init_driver(&ci_ehci_hc_driver, &ehci_ci_overrides);
+	orig_bus_suspend = ci_ehci_hc_driver.bus_suspend;
+	ci_ehci_hc_driver.bus_suspend = ci_ehci_bus_suspend;
+	ci_ehci_hc_driver.hub_control = ci_ehci_hub_control;
+}