USB: add Cypress c67x00 OTG controller HCD driver

This patch adds HCD support for the Cypress c67x00 family of devices.
Signed-off-by: NPeter Korsgaard <jacmet@sunsite.dk>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/usb/Makefile

@@ -17,6 +17,8 @@ obj-$(CONFIG_USB_SL811_HCD)	+= host/
 obj-$(CONFIG_USB_U132_HCD)	+= host/
 obj-$(CONFIG_USB_R8A66597_HCD)	+= host/
 
+obj-$(CONFIG_USB_C67X00_HCD)	+= c67x00/
+
 obj-$(CONFIG_USB_ACM)		+= class/
 obj-$(CONFIG_USB_PRINTER)	+= class/
 

drivers/usb/c67x00/Makefile

+#
+# Makefile for Cypress C67X00 USB Controller
+#
+
+ccflags-$(CONFIG_USB_DEBUG)		+= -DDEBUG
+
+obj-$(CONFIG_USB_C67X00_HCD)		+= c67x00.o
+
+c67x00-objs := c67x00-drv.o c67x00-ll-hpi.o c67x00-hcd.o c67x00-sched.o

drivers/usb/c67x00/c67x00-drv.c

@@ -41,6 +41,7 @@
 #include <linux/usb/c67x00.h>
 
 #include "c67x00.h"
+#include "c67x00-hcd.h"
 
 static void c67x00_probe_sie(struct c67x00_sie *sie,
 			     struct c67x00_device *dev, int sie_num)
@@ -51,6 +52,10 @@ static void c67x00_probe_sie(struct c67x00_sie *sie,
 	sie->mode = c67x00_sie_config(dev->pdata->sie_config, sie_num);
 
 	switch (sie->mode) {
+	case C67X00_SIE_HOST:
+		c67x00_hcd_probe(sie);
+		break;
+
 	case C67X00_SIE_UNUSED:
 		dev_info(sie_dev(sie),
 			 "Not using SIE %d as requested\n", sie->sie_num);
@@ -66,6 +71,14 @@ static void c67x00_probe_sie(struct c67x00_sie *sie,
 
 static void c67x00_remove_sie(struct c67x00_sie *sie)
 {
+	switch (sie->mode) {
+	case C67X00_SIE_HOST:
+		c67x00_hcd_remove(sie);
+		break;
+
+	default:
+		break;
+	}
 }
 
 static irqreturn_t c67x00_irq(int irq, void *__dev)

drivers/usb/c67x00/c67x00-hcd.c

+/*
+ * c67x00-hcd.c: Cypress C67X00 USB Host Controller Driver
+ *
+ * Copyright (C) 2006-2008 Barco N.V.
+ *    Derived from the Cypress cy7c67200/300 ezusb linux driver and
+ *    based on multiple host controller drivers inside the linux kernel.
+ *
+ * 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 Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA  02110-1301  USA.
+ */
+
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/usb.h>
+
+#include "c67x00.h"
+#include "c67x00-hcd.h"
+
+/* --------------------------------------------------------------------------
+ * Root Hub Support
+ */
+
+static __u8 c67x00_hub_des[] = {
+	0x09,			/*  __u8  bLength; */
+	0x29,			/*  __u8  bDescriptorType; Hub-descriptor */
+	0x02,			/*  __u8  bNbrPorts; */
+	0x00,			/* __u16  wHubCharacteristics; */
+	0x00,			/*   (per-port OC, no power switching) */
+	0x32,			/*  __u8  bPwrOn2pwrGood; 2ms */
+	0x00,			/*  __u8  bHubContrCurrent; 0 mA */
+	0x00,			/*  __u8  DeviceRemovable; ** 7 Ports max ** */
+	0xff,			/*  __u8  PortPwrCtrlMask; ** 7 ports max ** */
+};
+
+static void c67x00_hub_reset_host_port(struct c67x00_sie *sie, int port)
+{
+	struct c67x00_hcd *c67x00 = sie->private_data;
+	unsigned long flags;
+
+	c67x00_ll_husb_reset(sie, port);
+
+	spin_lock_irqsave(&c67x00->lock, flags);
+	c67x00_ll_husb_reset_port(sie, port);
+	spin_unlock_irqrestore(&c67x00->lock, flags);
+
+	c67x00_ll_set_husb_eot(sie->dev, DEFAULT_EOT);
+}
+
+static int c67x00_hub_status_data(struct usb_hcd *hcd, char *buf)
+{
+	struct c67x00_hcd *c67x00 = hcd_to_c67x00_hcd(hcd);
+	struct c67x00_sie *sie = c67x00->sie;
+	u16 status;
+	int i;
+
+	*buf = 0;
+	status = c67x00_ll_usb_get_status(sie);
+	for (i = 0; i < C67X00_PORTS; i++)
+		if (status & PORT_CONNECT_CHANGE(i))
+			*buf |= (1 << i);
+
+	/* bit 0 denotes hub change, b1..n port change */
+	*buf <<= 1;
+
+	return !!*buf;
+}
+
+static int c67x00_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
+			      u16 wIndex, char *buf, u16 wLength)
+{
+	struct c67x00_hcd *c67x00 = hcd_to_c67x00_hcd(hcd);
+	struct c67x00_sie *sie = c67x00->sie;
+	u16 status, usb_status;
+	int len = 0;
+	unsigned int port = wIndex-1;
+	u16 wPortChange, wPortStatus;
+
+	switch (typeReq) {
+
+	case GetHubStatus:
+		*(__le32 *) buf = cpu_to_le32(0);
+		len = 4;		/* hub power */
+		break;
+
+	case GetPortStatus:
+		if (wIndex > C67X00_PORTS)
+			return -EPIPE;
+
+		status = c67x00_ll_usb_get_status(sie);
+		usb_status = c67x00_ll_get_usb_ctl(sie);
+
+		wPortChange = 0;
+		if (status & PORT_CONNECT_CHANGE(port))
+			wPortChange |= USB_PORT_STAT_C_CONNECTION;
+
+		wPortStatus = USB_PORT_STAT_POWER;
+		if (!(status & PORT_SE0_STATUS(port)))
+			wPortStatus |= USB_PORT_STAT_CONNECTION;
+		if (usb_status & LOW_SPEED_PORT(port)) {
+			wPortStatus |= USB_PORT_STAT_LOW_SPEED;
+			c67x00->low_speed_ports |= (1 << port);
+		} else
+			c67x00->low_speed_ports &= ~(1 << port);
+
+		if (usb_status & SOF_EOP_EN(port))
+			wPortStatus |= USB_PORT_STAT_ENABLE;
+
+		*(__le16 *) buf = cpu_to_le16(wPortStatus);
+		*(__le16 *) (buf + 2) = cpu_to_le16(wPortChange);
+		len = 4;
+		break;
+
+	case SetHubFeature:	/* We don't implement these */
+	case ClearHubFeature:
+		switch (wValue) {
+		case C_HUB_OVER_CURRENT:
+		case C_HUB_LOCAL_POWER:
+			len = 0;
+			break;
+
+		default:
+			return -EPIPE;
+		}
+		break;
+
+	case SetPortFeature:
+		if (wIndex > C67X00_PORTS)
+			return -EPIPE;
+
+		switch (wValue) {
+		case USB_PORT_FEAT_SUSPEND:
+			dev_dbg(c67x00_hcd_dev(c67x00),
+				"SetPortFeature %d (SUSPEND)\n", port);
+			len = 0;
+			break;
+
+		case USB_PORT_FEAT_RESET:
+			c67x00_hub_reset_host_port(sie, port);
+			len = 0;
+			break;
+
+		case USB_PORT_FEAT_POWER:
+			/* Power always enabled */
+			len = 0;
+			break;
+
+		default:
+			dev_dbg(c67x00_hcd_dev(c67x00),
+				"%s: SetPortFeature %d (0x%04x) Error!\n",
+				__func__, port, wValue);
+			return -EPIPE;
+		}
+		break;
+
+	case ClearPortFeature:
+		if (wIndex > C67X00_PORTS)
+			return -EPIPE;
+
+		switch (wValue) {
+		case USB_PORT_FEAT_ENABLE:
+			/* Reset the port so that the c67x00 also notices the
+			 * disconnect */
+			c67x00_hub_reset_host_port(sie, port);
+			len = 0;
+			break;
+
+		case USB_PORT_FEAT_C_ENABLE:
+			dev_dbg(c67x00_hcd_dev(c67x00),
+				"ClearPortFeature (%d): C_ENABLE\n", port);
+			len = 0;
+			break;
+
+		case USB_PORT_FEAT_SUSPEND:
+			dev_dbg(c67x00_hcd_dev(c67x00),
+				"ClearPortFeature (%d): SUSPEND\n", port);
+			len = 0;
+			break;
+
+		case USB_PORT_FEAT_C_SUSPEND:
+			dev_dbg(c67x00_hcd_dev(c67x00),
+				"ClearPortFeature (%d): C_SUSPEND\n", port);
+			len = 0;
+			break;
+
+		case USB_PORT_FEAT_POWER:
+			dev_dbg(c67x00_hcd_dev(c67x00),
+				"ClearPortFeature (%d): POWER\n", port);
+			return -EPIPE;
+
+		case USB_PORT_FEAT_C_CONNECTION:
+			c67x00_ll_usb_clear_status(sie,
+						   PORT_CONNECT_CHANGE(port));
+			len = 0;
+			break;
+
+		case USB_PORT_FEAT_C_OVER_CURRENT:
+			dev_dbg(c67x00_hcd_dev(c67x00),
+				"ClearPortFeature (%d): OVER_CURRENT\n", port);
+			len = 0;
+			break;
+
+		case USB_PORT_FEAT_C_RESET:
+			dev_dbg(c67x00_hcd_dev(c67x00),
+				"ClearPortFeature (%d): C_RESET\n", port);
+			len = 0;
+			break;
+
+		default:
+			dev_dbg(c67x00_hcd_dev(c67x00),
+				"%s: ClearPortFeature %d (0x%04x) Error!\n",
+				__func__, port, wValue);
+			return -EPIPE;
+		}
+		break;
+
+	case GetHubDescriptor:
+		len = min_t(unsigned int, sizeof(c67x00_hub_des), wLength);
+		memcpy(buf, c67x00_hub_des, len);
+		break;
+
+	default:
+		dev_dbg(c67x00_hcd_dev(c67x00), "%s: unknown\n", __func__);
+		return -EPIPE;
+	}
+
+	return 0;
+}
+
+/* ---------------------------------------------------------------------
+ * Main part of host controller driver
+ */
+
+/**
+ * c67x00_hcd_irq
+ *
+ * This function is called from the interrupt handler in c67x00-drv.c
+ */
+static void c67x00_hcd_irq(struct c67x00_sie *sie, u16 int_status, u16 msg)
+{
+	struct c67x00_hcd *c67x00 = sie->private_data;
+	struct usb_hcd *hcd = c67x00_hcd_to_hcd(c67x00);
+
+	/* Handle sie message flags */
+	if (msg) {
+		if (msg & HUSB_TDListDone)
+			c67x00_sched_kick(c67x00);
+		else
+			dev_warn(c67x00_hcd_dev(c67x00),
+				 "Unknown SIE msg flag(s): 0x%04x\n", msg);
+	}
+
+	if (unlikely(hcd->state == HC_STATE_HALT))
+		return;
+
+	if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))
+		return;
+
+	/* Handle Start of frame events */
+	if (int_status & SOFEOP_FLG(sie->sie_num)) {
+		c67x00_ll_usb_clear_status(sie, SOF_EOP_IRQ_FLG);
+		c67x00_sched_kick(c67x00);
+		set_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);
+	}
+}
+
+/**
+ * c67x00_hcd_start: Host controller start hook
+ */
+static int c67x00_hcd_start(struct usb_hcd *hcd)
+{
+	hcd->uses_new_polling = 1;
+	hcd->state = HC_STATE_RUNNING;
+	hcd->poll_rh = 1;
+
+	return 0;
+}
+
+/**
+ * c67x00_hcd_stop: Host controller stop hook
+ */
+static void c67x00_hcd_stop(struct usb_hcd *hcd)
+{
+	/* Nothing to do */
+}
+
+static int c67x00_hcd_get_frame(struct usb_hcd *hcd)
+{
+	struct c67x00_hcd *c67x00 = hcd_to_c67x00_hcd(hcd);
+	u16 temp_val;
+
+	dev_dbg(c67x00_hcd_dev(c67x00), "%s\n", __func__);
+	temp_val = c67x00_ll_husb_get_frame(c67x00->sie);
+	temp_val &= HOST_FRAME_MASK;
+	return temp_val ? (temp_val - 1) : HOST_FRAME_MASK;
+}
+
+static struct hc_driver c67x00_hc_driver = {
+	.description	= "c67x00-hcd",
+	.product_desc	= "Cypress C67X00 Host Controller",
+	.hcd_priv_size	= sizeof(struct c67x00_hcd),
+	.flags		= HCD_USB11 | HCD_MEMORY,
+
+	/*
+	 * basic lifecycle operations
+	 */
+	.start		= c67x00_hcd_start,
+	.stop		= c67x00_hcd_stop,
+
+	/*
+	 * managing i/o requests and associated device resources
+	 */
+	.urb_enqueue	= c67x00_urb_enqueue,
+	.urb_dequeue	= c67x00_urb_dequeue,
+	.endpoint_disable = c67x00_endpoint_disable,
+
+	/*
+	 * scheduling support
+	 */
+	.get_frame_number = c67x00_hcd_get_frame,
+
+	/*
+	 * root hub support
+	 */
+	.hub_status_data = c67x00_hub_status_data,
+	.hub_control	= c67x00_hub_control,
+};
+
+/* ---------------------------------------------------------------------
+ * Setup/Teardown routines
+ */
+
+int c67x00_hcd_probe(struct c67x00_sie *sie)
+{
+	struct c67x00_hcd *c67x00;
+	struct usb_hcd *hcd;
+	unsigned long flags;
+	int retval;
+
+	if (usb_disabled())
+		return -ENODEV;
+
+	hcd = usb_create_hcd(&c67x00_hc_driver, sie_dev(sie), "c67x00_sie");
+	if (!hcd) {
+		retval = -ENOMEM;
+		goto err0;
+	}
+	c67x00 = hcd_to_c67x00_hcd(hcd);
+
+	spin_lock_init(&c67x00->lock);
+	c67x00->sie = sie;
+
+	INIT_LIST_HEAD(&c67x00->list[PIPE_ISOCHRONOUS]);
+	INIT_LIST_HEAD(&c67x00->list[PIPE_INTERRUPT]);
+	INIT_LIST_HEAD(&c67x00->list[PIPE_CONTROL]);
+	INIT_LIST_HEAD(&c67x00->list[PIPE_BULK]);
+	c67x00->urb_count = 0;
+	INIT_LIST_HEAD(&c67x00->td_list);
+	c67x00->td_base_addr = CY_HCD_BUF_ADDR + SIE_TD_OFFSET(sie->sie_num);
+	c67x00->buf_base_addr = CY_HCD_BUF_ADDR + SIE_BUF_OFFSET(sie->sie_num);
+	c67x00->max_frame_bw = MAX_FRAME_BW_STD;
+
+	c67x00_ll_husb_init_host_port(sie);
+
+	init_completion(&c67x00->endpoint_disable);
+	retval = c67x00_sched_start_scheduler(c67x00);
+	if (retval)
+		goto err1;
+
+	retval = usb_add_hcd(hcd, 0, 0);
+	if (retval) {
+		dev_dbg(sie_dev(sie), "%s: usb_add_hcd returned %d\n",
+			__func__, retval);
+		goto err2;
+	}
+
+	spin_lock_irqsave(&sie->lock, flags);
+	sie->private_data = c67x00;
+	sie->irq = c67x00_hcd_irq;
+	spin_unlock_irqrestore(&sie->lock, flags);
+
+	return retval;
+
+ err2:
+	c67x00_sched_stop_scheduler(c67x00);
+ err1:
+	usb_put_hcd(hcd);
+ err0:
+	return retval;
+}
+
+/* may be called with controller, bus, and devices active */
+void c67x00_hcd_remove(struct c67x00_sie *sie)
+{
+	struct c67x00_hcd *c67x00 = sie->private_data;
+	struct usb_hcd *hcd = c67x00_hcd_to_hcd(c67x00);
+
+	c67x00_sched_stop_scheduler(c67x00);
+	usb_remove_hcd(hcd);
+	usb_put_hcd(hcd);
+}

drivers/usb/c67x00/c67x00-hcd.h

+/*
+ * c67x00-hcd.h: Cypress C67X00 USB HCD
+ *
+ * Copyright (C) 2006-2008 Barco N.V.
+ *    Derived from the Cypress cy7c67200/300 ezusb linux driver and
+ *    based on multiple host controller drivers inside the linux kernel.
+ *
+ * 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 Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA  02110-1301  USA.
+ */
+
+#ifndef _USB_C67X00_HCD_H
+#define _USB_C67X00_HCD_H
+
+#include <linux/kernel.h>
+#include <linux/spinlock.h>
+#include <linux/list.h>
+#include <linux/usb.h>
+#include "../core/hcd.h"
+#include "c67x00.h"
+
+/*
+ * The following parameters depend on the CPU speed, bus speed, ...
+ * These can be tuned for specific use cases, e.g. if isochronous transfers
+ * are very important, bandwith can be sacrificed to guarantee that the
+ * 1ms deadline will be met.
+ * If bulk transfers are important, the MAX_FRAME_BW can be increased,
+ * but some (or many) isochronous deadlines might not be met.
+ *
+ * The values are specified in bittime.
+ */
+
+/*
+ * The current implementation switches between _STD (default) and _ISO (when
+ * isochronous transfers are scheduled), in order to optimize the throughput
+ * in normal cicrumstances, but also provide good isochronous behaviour.
+ *
+ * Bandwidth is described in bit time so with a 12MHz USB clock and 1ms
+ * frames; there are 12000 bit times per frame.
+ */
+
+#define TOTAL_FRAME_BW		12000
+#define DEFAULT_EOT		2250
+
+#define MAX_FRAME_BW_STD	(TOTAL_FRAME_BW - DEFAULT_EOT)
+#define MAX_FRAME_BW_ISO	2400
+
+/*
+ * Periodic transfers may only use 90% of the full frame, but as
+ * we currently don't even use 90% of the full frame, we may
+ * use the full usable time for periodic transfers.
+ */
+#define MAX_PERIODIC_BW(full_bw)	full_bw
+
+/* -------------------------------------------------------------------------- */
+
+struct c67x00_hcd {
+	spinlock_t lock;
+	struct c67x00_sie *sie;
+	unsigned int low_speed_ports;	/* bitmask of low speed ports */
+	unsigned int urb_count;
+	unsigned int urb_iso_count;
+
+	struct list_head list[4];	/* iso, int, ctrl, bulk */
+#if PIPE_BULK != 3
+#error "Sanity check failed, this code presumes PIPE_... to range from 0 to 3"
+#endif
+
+	/* USB bandwidth allocated to td_list */
+	int bandwidth_allocated;
+	/* USB bandwidth allocated for isoc/int transfer */
+	int periodic_bw_allocated;
+	struct list_head td_list;
+	int max_frame_bw;
+
+	u16 td_base_addr;
+	u16 buf_base_addr;
+	u16 next_td_addr;
+	u16 next_buf_addr;
+
+	struct tasklet_struct tasklet;
+
+	struct completion endpoint_disable;
+
+	u16 current_frame;
+	u16 last_frame;
+};
+
+static inline struct c67x00_hcd *hcd_to_c67x00_hcd(struct usb_hcd *hcd)
+{
+	return (struct c67x00_hcd *)(hcd->hcd_priv);
+}
+
+static inline struct usb_hcd *c67x00_hcd_to_hcd(struct c67x00_hcd *c67x00)
+{
+	return container_of((void *)c67x00, struct usb_hcd, hcd_priv);
+}
+
+/* ---------------------------------------------------------------------
+ * Functions used by c67x00-drv
+ */
+
+int c67x00_hcd_probe(struct c67x00_sie *sie);
+void c67x00_hcd_remove(struct c67x00_sie *sie);
+
+/* ---------------------------------------------------------------------
+ * Transfer Descriptor scheduling functions
+ */
+int c67x00_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flags);
+int c67x00_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status);
+void c67x00_endpoint_disable(struct usb_hcd *hcd,
+			     struct usb_host_endpoint *ep);
+
+void c67x00_hcd_msg_received(struct c67x00_sie *sie, u16 msg);
+void c67x00_sched_kick(struct c67x00_hcd *c67x00);
+int c67x00_sched_start_scheduler(struct c67x00_hcd *c67x00);
+void c67x00_sched_stop_scheduler(struct c67x00_hcd *c67x00);
+
+#define c67x00_hcd_dev(x)	(c67x00_hcd_to_hcd(x)->self.controller)
+
+#endif				/* _USB_C67X00_HCD_H */

drivers/usb/c67x00/c67x00-ll-hpi.c

@@ -296,6 +296,81 @@ static int c67x00_comm_exec_int(struct c67x00_device *dev, u16 nr,
 	return rc;
 }
 
+/* -------------------------------------------------------------------------- */
+/* Host specific functions */
+
+void c67x00_ll_set_husb_eot(struct c67x00_device *dev, u16 value)
+{
+	mutex_lock(&dev->hpi.lcp.mutex);
+	hpi_write_word(dev, HUSB_pEOT, value);
+	mutex_unlock(&dev->hpi.lcp.mutex);
+}
+
+static inline void c67x00_ll_husb_sie_init(struct c67x00_sie *sie)
+{
+	struct c67x00_device *dev = sie->dev;
+	struct c67x00_lcp_int_data data;
+	int rc;
+
+	rc = c67x00_comm_exec_int(dev, HUSB_SIE_INIT_INT(sie->sie_num), &data);
+	BUG_ON(rc); /* No return path for error code; crash spectacularly */
+}
+
+void c67x00_ll_husb_reset(struct c67x00_sie *sie, int port)
+{
+	struct c67x00_device *dev = sie->dev;
+	struct c67x00_lcp_int_data data;
+	int rc;
+
+	data.regs[0] = 50;	/* Reset USB port for 50ms */
+	data.regs[1] = port | (sie->sie_num << 1);
+	rc = c67x00_comm_exec_int(dev, HUSB_RESET_INT, &data);
+	BUG_ON(rc); /* No return path for error code; crash spectacularly */
+}
+
+void c67x00_ll_husb_set_current_td(struct c67x00_sie *sie, u16 addr)
+{
+	hpi_write_word(sie->dev, HUSB_SIE_pCurrentTDPtr(sie->sie_num), addr);
+}
+
+u16 c67x00_ll_husb_get_current_td(struct c67x00_sie *sie)
+{
+	return hpi_read_word(sie->dev, HUSB_SIE_pCurrentTDPtr(sie->sie_num));
+}
+
+u16 c67x00_ll_husb_get_frame(struct c67x00_sie *sie)
+{
+	return hpi_read_word(sie->dev, HOST_FRAME_REG(sie->sie_num));
+}
+
+void c67x00_ll_husb_init_host_port(struct c67x00_sie *sie)
+{
+	/* Set port into host mode */
+	hpi_set_bits(sie->dev, USB_CTL_REG(sie->sie_num), HOST_MODE);
+	c67x00_ll_husb_sie_init(sie);
+	/* Clear interrupts */
+	c67x00_ll_usb_clear_status(sie, HOST_STAT_MASK);
+	/* Check */
+	if (!(hpi_read_word(sie->dev, USB_CTL_REG(sie->sie_num)) & HOST_MODE))
+		dev_warn(sie_dev(sie),
+			 "SIE %d not set to host mode\n", sie->sie_num);
+}
+
+void c67x00_ll_husb_reset_port(struct c67x00_sie *sie, int port)
+{
+	/* Clear connect change */
+	c67x00_ll_usb_clear_status(sie, PORT_CONNECT_CHANGE(port));
+
+	/* Enable interrupts */
+	hpi_set_bits(sie->dev, HPI_IRQ_ROUTING_REG,
+		     SOFEOP_TO_CPU_EN(sie->sie_num));
+	hpi_set_bits(sie->dev, HOST_IRQ_EN_REG(sie->sie_num),
+		     SOF_EOP_IRQ_EN | DONE_IRQ_EN);
+
+	/* Enable pull down transistors */
+	hpi_set_bits(sie->dev, USB_CTL_REG(sie->sie_num), PORT_RES_EN(port));
+}
+
 /* -------------------------------------------------------------------------- */
 
 void c67x00_ll_irq(struct c67x00_device *dev, u16 int_status)

drivers/usb/c67x00/c67x00.h

@@ -274,6 +274,15 @@ void c67x00_ll_write_mem_le16(struct c67x00_device *dev, u16 addr,
 void c67x00_ll_read_mem_le16(struct c67x00_device *dev, u16 addr,
 			     void *data, int len);
 
+/* Host specific functions */
+void c67x00_ll_set_husb_eot(struct c67x00_device *dev, u16 value);
+void c67x00_ll_husb_reset(struct c67x00_sie *sie, int port);
+void c67x00_ll_husb_set_current_td(struct c67x00_sie *sie, u16 addr);
+u16 c67x00_ll_husb_get_current_td(struct c67x00_sie *sie);
+u16 c67x00_ll_husb_get_frame(struct c67x00_sie *sie);
+void c67x00_ll_husb_init_host_port(struct c67x00_sie *sie);
+void c67x00_ll_husb_reset_port(struct c67x00_sie *sie, int port);
+
 /* Called by c67x00_irq to handle lcp interrupts */
 void c67x00_ll_irq(struct c67x00_device *dev, u16 int_status);
 

drivers/usb/host/Kconfig

@@ -4,6 +4,19 @@
 comment "USB Host Controller Drivers"
 	depends on USB
 
+config USB_C67X00_HCD
+	tristate "Cypress C67x00 HCD support"
+	depends on USB
+	help
+	  The Cypress C67x00 (EZ-Host/EZ-OTG) chips are dual-role
+	  host/peripheral/OTG USB controllers.
+
+	  Enable this option to support this chip in host controller mode.
+	  If unsure, say N.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called c67x00.
+
 config USB_EHCI_HCD
 	tristate "EHCI HCD (USB 2.0) support"
 	depends on USB && USB_ARCH_HAS_EHCI