USB: add Cypress c67x00 OTG controller HCD driver

This patch adds HCD support for the Cypress c67x00 family of devices.

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 412 insertions, 0 deletions

diff --git a/drivers/usb/c67x00/c67x00-hcd.c b/drivers/usb/c67x00/c67x00-hcd.c
new file mode 100644
index 000000000000..a22b887f4e9e
--- /dev/null
+++ b/drivers/usb/c67x00/c67x00-hcd.c
@@ -0,0 +1,412 @@
+/*
+ * 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);
+}