/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2008 Cavium Networks
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/usb.h>
#include <linux/time.h>
#include <linux/delay.h>
#include <asm/octeon/cvmx.h>
#include "cvmx-usb.h"
#include <asm/octeon/cvmx-iob-defs.h>
#include <linux/usb/hcd.h>
#include <linux/err.h>
struct octeon_hcd {
spinlock_t lock;
cvmx_usb_state_t usb;
struct tasklet_struct dequeue_tasklet;
struct list_head dequeue_list;
};
/* convert between an HCD pointer and the corresponding struct octeon_hcd */
static inline struct octeon_hcd *hcd_to_octeon(struct usb_hcd *hcd)
{
return (struct octeon_hcd *)(hcd->hcd_priv);
}
static inline struct usb_hcd *octeon_to_hcd(struct octeon_hcd *p)
{
return container_of((void *)p, struct usb_hcd, hcd_priv);
}
static inline struct octeon_hcd *cvmx_usb_to_octeon(cvmx_usb_state_t *p)
{
return container_of(p, struct octeon_hcd, usb);
}
static irqreturn_t octeon_usb_irq(struct usb_hcd *hcd)
{
struct octeon_hcd *priv = hcd_to_octeon(hcd);
unsigned long flags;
spin_lock_irqsave(&priv->lock, flags);
cvmx_usb_poll(&priv->usb);
spin_unlock_irqrestore(&priv->lock, flags);
return IRQ_HANDLED;
}
static void octeon_usb_port_callback(cvmx_usb_state_t *usb,
cvmx_usb_callback_t reason,
cvmx_usb_complete_t status,
int pipe_handle,
int submit_handle,
int bytes_transferred,
void *user_data)
{
struct octeon_hcd *priv = cvmx_usb_to_octeon(usb);
spin_unlock(&priv->lock);
usb_hcd_poll_rh_status(octeon_to_hcd(priv));
spin_lock(&priv->lock);
}
static int octeon_usb_start(struct usb_hcd *hcd)
{
struct octeon_hcd *priv = hcd_to_octeon(hcd);
unsigned long flags;
hcd->state = HC_STATE_RUNNING;
spin_lock_irqsave(&priv->lock, flags);
cvmx_usb_register_callback(&priv->usb, CVMX_USB_CALLBACK_PORT_CHANGED,
octeon_usb_port_callback, NULL);
spin_unlock_irqrestore(&priv->lock, flags);
return 0;
}
static void octeon_usb_stop(struct usb_hcd *hcd)
{
struct octeon_hcd *priv = hcd_to_octeon(hcd);
unsigned long flags;
spin_lock_irqsave(&priv->lock, flags);
cvmx_usb_register_callback(&priv->usb, CVMX_USB_CALLBACK_PORT_CHANGED,
NULL, NULL);
spin_unlock_irqrestore(&priv->lock, flags);
hcd->state = HC_STATE_HALT;
}
static int octeon_usb_get_frame_number(struct usb_hcd *hcd)
{
struct octeon_hcd *priv = hcd_to_octeon(hcd);
return cvmx_usb_get_frame_number(&priv->usb);
}
static void octeon_usb_urb_complete_callback(cvmx_usb_state_t *usb,
cvmx_usb_callback_t reason,
cvmx_usb_complete_t status,
int pipe_handle,
int submit_handle,
int bytes_transferred,
void *user_data)
{
struct octeon_hcd *priv = cvmx_usb_to_octeon(usb);
struct usb_hcd *hcd = octeon_to_hcd(priv);
struct device *dev = hcd->self.controller;
struct urb *urb = user_data;
urb->actual_length = bytes_transferred;
urb->hcpriv = NULL;
if (!list_empty(&urb->urb_list)) {
/*
* It is on the dequeue_list, but we are going to call
* usb_hcd_giveback_urb(), so we must clear it from
* the list. We got to it before the
* octeon_usb_urb_dequeue_work() tasklet did.
*/
list_del(&urb->urb_list);
/* No longer on the dequeue_list. */
INIT_LIST_HEAD(&urb->urb_list);
}
/* For Isochronous transactions we need to update the URB packet status
list from data in our private copy */
if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
int i;
/*
* The pointer to the private list is stored in the setup_packet
* field.
*/
cvmx_usb_iso_packet_t *iso_packet = (cvmx_usb_iso_packet_t *) urb->setup_packet;
/* Recalculate the transfer size by adding up each packet */
urb->actual_length = 0;
for (i = 0; i < urb->number_of_packets; i++) {
if (iso_packet[i].status == CVMX_USB_COMPLETE_SUCCESS) {
urb->iso_frame_desc[i].status = 0;
urb->iso_frame_desc[i].actual_length = iso_packet[i].length;
urb->actual_length += urb->iso_frame_desc[i].actual_length;
} else {
dev_dbg(dev, "ISOCHRONOUS packet=%d of %d status=%d pipe=%d submit=%d size=%d\n",
i, urb->number_of_packets,
iso_packet[i].status, pipe_handle,
submit_handle, iso_packet[i].length);
urb->iso_frame_desc[i].status = -EREMOTEIO;
}
}
/* Free the private list now that we don't need it anymore */
kfree(iso_packet);
urb->setup_packet = NULL;
}
switch (status) {
case CVMX_USB_COMPLETE_SUCCESS:
urb->status = 0;
break;
case CVMX_USB_COMPLETE_CANCEL:
if (urb->status == 0)
urb->status = -ENOENT;
break;
case CVMX_USB_COMPLETE_STALL:
dev_dbg(dev, "status=stall pipe=%d submit=%d size=%d\n",
pipe_handle, submit_handle, bytes_transferred);
urb->status = -EPIPE;
break;
case CVMX_USB_COMPLETE_BABBLEERR:
dev_dbg(dev, "status=babble pipe=%d submit=%d size=%d\n",
pipe_handle, submit_handle, bytes_transferred);
urb->status = -EPIPE;
break;
case CVMX_USB_COMPLETE_SHORT:
dev_dbg(dev, "status=short pipe=%d submit=%d size=%d\n",
pipe_handle, submit_handle, bytes_transferred);
urb->status = -EREMOTEIO;
break;
case CVMX_USB_COMPLETE_ERROR:
case CVMX_USB_COMPLETE_XACTERR:
case CVMX_USB_COMPLETE_DATATGLERR:
case CVMX_USB_COMPLETE_FRAMEERR:
dev_dbg(dev, "status=%d pipe=%d submit=%d size=%d\n",
status, pipe_handle, submit_handle, bytes_transferred);
urb->status = -EPROTO;
break;
}
spin_unlock(&priv->lock);
usb_hcd_giveback_urb(octeon_to_hcd(priv), urb, urb->status);
spin_lock(&priv->lock);
}
static int octeon_usb_urb_enqueue(struct usb_hcd *hcd,
struct urb *urb,
gfp_t mem_flags)
{
struct octeon_hcd *priv = hcd_to_octeon(hcd);
struct device *dev = hcd->self.controller;
int submit_handle = -1;
int pipe_handle;
unsigned long flags;
cvmx_usb_iso_packet_t *iso_packet;
struct usb_host_endpoint *ep = urb->ep;
urb->status = 0;
INIT_LIST_HEAD(&urb->urb_list); /* not enqueued on dequeue_list */
spin_lock_irqsave(&priv->lock, flags);
if (!ep->hcpriv) {
cvmx_usb_transfer_t transfer_type;
cvmx_usb_speed_t speed;
int split_device = 0;
int split_port = 0;
switch (usb_pipetype(urb->pipe)) {
case PIPE_ISOCHRONOUS:
transfer_type = CVMX_USB_TRANSFER_ISOCHRONOUS;
break;
case PIPE_INTERRUPT:
transfer_type = CVMX_USB_TRANSFER_INTERRUPT;
break;
case PIPE_CONTROL:
transfer_type = CVMX_USB_TRANSFER_CONTROL;
break;
default:
transfer_type = CVMX_USB_TRANSFER_BULK;
break;
}
switch (urb->dev->speed) {
case USB_SPEED_LOW:
speed = CVMX_USB_SPEED_LOW;
break;
case USB_SPEED_FULL:
speed = CVMX_USB_SPEED_FULL;
break;
default:
speed = CVMX_USB_SPEED_HIGH;
break;
}
/*
* For slow devices on high speed ports we need to find the hub
* that does the speed translation so we know where to send the
* split transactions.
*/
if (speed != CVMX_USB_SPEED_HIGH) {
/*
* Start at this device and work our way up the usb
* tree.
*/
struct usb_device *dev = urb->dev;
while (dev->parent) {
/*
* If our parent is high speed then he'll
* receive the splits.
*/
if (dev->parent->speed == USB_SPEED_HIGH) {
split_device = dev->parent->devnum;
split_port = dev->portnum;
break;
}
/*
* Move up the tree one level. If we make it all
* the way up the tree, then the port must not
* be in high speed mode and we don't need a
* split.
*/
dev = dev->parent;
}
}
pipe_handle = cvmx_usb_open_pipe(&priv->usb,
0,
usb_pipedevice(urb->pipe),
usb_pipeendpoint(urb->pipe),
speed,
le16_to_cpu(ep->desc.wMaxPacketSize) & 0x7ff,
transfer_type,
usb_pipein(urb->pipe) ? CVMX_USB_DIRECTION_IN : CVMX_USB_DIRECTION_OUT,
urb->interval,
(le16_to_cpu(ep->desc.wMaxPacketSize) >> 11) & 0x3,
split_device,
split_port);
if (pipe_handle < 0) {
spin_unlock_irqrestore(&priv->lock, flags);
dev_dbg(dev, "Failed to create pipe\n");
return -ENOMEM;
}
ep->hcpriv = (void *)(0x10000L + pipe_handle);
} else {
pipe_handle = 0xffff & (long)ep->hcpriv;
}
switch (usb_pipetype(urb->pipe)) {
case PIPE_ISOCHRONOUS:
dev_dbg(dev, "Submit isochronous to %d.%d\n",
usb_pipedevice(urb->pipe), usb_pipeendpoint(urb->pipe));
/*
* Allocate a structure to use for our private list of
* isochronous packets.
*/
iso_packet = kmalloc(urb->number_of_packets * sizeof(cvmx_usb_iso_packet_t), GFP_ATOMIC);
if (iso_packet) {
int i;
/* Fill the list with the data from the URB */
for (i = 0; i < urb->number_of_packets; i++) {
iso_packet[i].offset = urb->iso_frame_desc[i].offset;
iso_packet[i].length = urb->iso_frame_desc[i].length;
iso_packet[i].status = CVMX_USB_COMPLETE_ERROR;
}
/*
* Store a pointer to the list in the URB setup_packet
* field. We know this currently isn't being used and
* this saves us a bunch of logic.
*/
urb->setup_packet = (char *)iso_packet;
submit_handle = cvmx_usb_submit_isochronous(&priv->usb, pipe_handle,
urb->start_frame,
0 /* flags */ ,
urb->number_of_packets,
iso_packet,
urb->transfer_dma,
urb->transfer_buffer_length,
octeon_usb_urb_complete_callback,
urb);
/*
* If submit failed we need to free our private packet
* list.
*/
if (submit_handle < 0) {
urb->setup_packet = NULL;
kfree(iso_packet);
}
}
break;
case PIPE_INTERRUPT:
dev_dbg(dev, "Submit interrupt to %d.%d\n",
usb_pipedevice(urb->pipe), usb_pipeendpoint(urb->pipe));
submit_handle = cvmx_usb_submit_interrupt(&priv->usb, pipe_handle,
urb->transfer_dma,
urb->transfer_buffer_length,
octeon_usb_urb_complete_callback,
urb);
break;
case PIPE_CONTROL:
dev_dbg(dev, "Submit control to %d.%d\n",
usb_pipedevice(urb->pipe), usb_pipeendpoint(urb->pipe));
submit_handle = cvmx_usb_submit_control(&priv->usb, pipe_handle,
urb->setup_dma,
urb->transfer_dma,
urb->transfer_buffer_length,
octeon_usb_urb_complete_callback,
urb);
break;
case PIPE_BULK:
dev_dbg(dev, "Submit bulk to %d.%d\n",
usb_pipedevice(urb->pipe), usb_pipeendpoint(urb->pipe));
submit_handle = cvmx_usb_submit_bulk(&priv->usb, pipe_handle,
urb->transfer_dma,
urb->transfer_buffer_length,
octeon_usb_urb_complete_callback,
urb);
break;
}
if (submit_handle < 0) {
spin_unlock_irqrestore(&priv->lock, flags);
dev_dbg(dev, "Failed to submit\n");
return -ENOMEM;
}
urb->hcpriv = (void *)(long)(((submit_handle & 0xffff) << 16) | pipe_handle);
spin_unlock_irqrestore(&priv->lock, flags);
return 0;
}
static void octeon_usb_urb_dequeue_work(unsigned long arg)
{
unsigned long flags;
struct octeon_hcd *priv = (struct octeon_hcd *)arg;
spin_lock_irqsave(&priv->lock, flags);
while (!list_empty(&priv->dequeue_list)) {
int pipe_handle;
int submit_handle;
struct urb *urb = container_of(priv->dequeue_list.next, struct urb, urb_list);
list_del(&urb->urb_list);
/* not enqueued on dequeue_list */
INIT_LIST_HEAD(&urb->urb_list);
pipe_handle = 0xffff & (long)urb->hcpriv;
submit_handle = ((long)urb->hcpriv) >> 16;
cvmx_usb_cancel(&priv->usb, pipe_handle, submit_handle);
}
spin_unlock_irqrestore(&priv->lock, flags);
}
static int octeon_usb_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
{
struct octeon_hcd *priv = hcd_to_octeon(hcd);
unsigned long flags;
if (!urb->dev)
return -EINVAL;
spin_lock_irqsave(&priv->lock, flags);
urb->status = status;
list_add_tail(&urb->urb_list, &priv->dequeue_list);
spin_unlock_irqrestore(&priv->lock, flags);
tasklet_schedule(&priv->dequeue_tasklet);
return 0;
}
static void octeon_usb_endpoint_disable(struct usb_hcd *hcd, struct usb_host_endpoint *ep)
{
struct device *dev = hcd->self.controller;
if (ep->hcpriv) {
struct octeon_hcd *priv = hcd_to_octeon(hcd);
int pipe_handle = 0xffff & (long)ep->hcpriv;
unsigned long flags;
spin_lock_irqsave(&priv->lock, flags);
cvmx_usb_cancel_all(&priv->usb, pipe_handle);
if (cvmx_usb_close_pipe(&priv->usb, pipe_handle))
dev_dbg(dev, "Closing pipe %d failed\n", pipe_handle);
spin_unlock_irqrestore(&priv->lock, flags);
ep->hcpriv = NULL;
}
}
static int octeon_usb_hub_status_data(struct usb_hcd *hcd, char *buf)
{
struct octeon_hcd *priv = hcd_to_octeon(hcd);
cvmx_usb_port_status_t port_status;
unsigned long flags;
spin_lock_irqsave(&priv->lock, flags);
port_status = cvmx_usb_get_status(&priv->usb);
spin_unlock_irqrestore(&priv->lock, flags);
buf[0] = 0;
buf[0] = port_status.connect_change << 1;
return (buf[0] != 0);
}
static int octeon_usb_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue, u16 wIndex, char *buf, u16 wLength)
{
struct octeon_hcd *priv = hcd_to_octeon(hcd);
struct device *dev = hcd->self.controller;
cvmx_usb_port_status_t usb_port_status;
int port_status;
struct usb_hub_descriptor *desc;
unsigned long flags;
switch (typeReq) {
case ClearHubFeature:
dev_dbg(dev, "ClearHubFeature\n");
switch (wValue) {
case C_HUB_LOCAL_POWER:
case C_HUB_OVER_CURRENT:
/* Nothing required here */
break;
default:
return -EINVAL;
}
break;
case ClearPortFeature:
dev_dbg(dev, "ClearPortFeature\n");
if (wIndex != 1) {
dev_dbg(dev, " INVALID\n");
return -EINVAL;
}
switch (wValue) {
case USB_PORT_FEAT_ENABLE:
dev_dbg(dev, " ENABLE\n");
spin_lock_irqsave(&priv->lock, flags);
cvmx_usb_disable(&priv->usb);
spin_unlock_irqrestore(&priv->lock, flags);
break;
case USB_PORT_FEAT_SUSPEND:
dev_dbg(dev, " SUSPEND\n");
/* Not supported on Octeon */
break;
case USB_PORT_FEAT_POWER:
dev_dbg(dev, " POWER\n");
/* Not supported on Octeon */
break;
case USB_PORT_FEAT_INDICATOR:
dev_dbg(dev, " INDICATOR\n");
/* Port inidicator not supported */
break;
case USB_PORT_FEAT_C_CONNECTION:
dev_dbg(dev, " C_CONNECTION\n");
/* Clears drivers internal connect status change flag */
spin_lock_irqsave(&priv->lock, flags);
cvmx_usb_set_status(&priv->usb, cvmx_usb_get_status(&priv->usb));
spin_unlock_irqrestore(&priv->lock, flags);
break;
case USB_PORT_FEAT_C_RESET:
dev_dbg(dev, " C_RESET\n");
/*
* Clears the driver's internal Port Reset Change flag.
*/
spin_lock_irqsave(&priv->lock, flags);
cvmx_usb_set_status(&priv->usb, cvmx_usb_get_status(&priv->usb));
spin_unlock_irqrestore(&priv->lock, flags);
break;
case USB_PORT_FEAT_C_ENABLE:
dev_dbg(dev, " C_ENABLE\n");
/*
* Clears the driver's internal Port Enable/Disable
* Change flag.
*/
spin_lock_irqsave(&priv->lock, flags);
cvmx_usb_set_status(&priv->usb, cvmx_usb_get_status(&priv->usb));
spin_unlock_irqrestore(&priv->lock, flags);
break;
case USB_PORT_FEAT_C_SUSPEND:
dev_dbg(dev, " C_SUSPEND\n");
/*
* Clears the driver's internal Port Suspend Change
* flag, which is set when resume signaling on the host
* port is complete.
*/
break;
case USB_PORT_FEAT_C_OVER_CURRENT:
dev_dbg(dev, " C_OVER_CURRENT\n");
/* Clears the driver's overcurrent Change flag */
spin_lock_irqsave(&priv->lock, flags);
cvmx_usb_set_status(&priv->usb, cvmx_usb_get_status(&priv->usb));
spin_unlock_irqrestore(&priv->lock, flags);
break;
default:
dev_dbg(dev, " UNKNOWN\n");
return -EINVAL;
}
break;
case GetHubDescriptor:
dev_dbg(dev, "GetHubDescriptor\n");
desc = (struct usb_hub_descriptor *)buf;
desc->bDescLength = 9;
desc->bDescriptorType = 0x29;
desc->bNbrPorts = 1;
desc->wHubCharacteristics = 0x08;
desc->bPwrOn2PwrGood = 1;
desc->bHubContrCurrent = 0;
desc->u.hs.DeviceRemovable[0] = 0;
desc->u.hs.DeviceRemovable[1] = 0xff;
break;
case GetHubStatus:
dev_dbg(dev, "GetHubStatus\n");
*(__le32 *) buf = 0;
break;
case GetPortStatus:
dev_dbg(dev, "GetPortStatus\n");
if (wIndex != 1) {
dev_dbg(dev, " INVALID\n");
return -EINVAL;
}
spin_lock_irqsave(&priv->lock, flags);
usb_port_status = cvmx_usb_get_status(&priv->usb);
spin_unlock_irqrestore(&priv->lock, flags);
port_status = 0;
if (usb_port_status.connect_change) {
port_status |= (1 << USB_PORT_FEAT_C_CONNECTION);
dev_dbg(dev, " C_CONNECTION\n");
}
if (usb_port_status.port_enabled) {
port_status |= (1 << USB_PORT_FEAT_C_ENABLE);
dev_dbg(dev, " C_ENABLE\n");
}
if (usb_port_status.connected) {
port_status |= (1 << USB_PORT_FEAT_CONNECTION);
dev_dbg(dev, " CONNECTION\n");
}
if (usb_port_status.port_enabled) {
port_status |= (1 << USB_PORT_FEAT_ENABLE);
dev_dbg(dev, " ENABLE\n");
}
if (usb_port_status.port_over_current) {
port_status |= (1 << USB_PORT_FEAT_OVER_CURRENT);
dev_dbg(dev, " OVER_CURRENT\n");
}
if (usb_port_status.port_powered) {
port_status |= (1 << USB_PORT_FEAT_POWER);
dev_dbg(dev, " POWER\n");
}
if (usb_port_status.port_speed == CVMX_USB_SPEED_HIGH) {
port_status |= USB_PORT_STAT_HIGH_SPEED;
dev_dbg(dev, " HIGHSPEED\n");
} else if (usb_port_status.port_speed == CVMX_USB_SPEED_LOW) {
port_status |= (1 << USB_PORT_FEAT_LOWSPEED);
dev_dbg(dev, " LOWSPEED\n");
}
*((__le32 *) buf) = cpu_to_le32(port_status);
break;
case SetHubFeature:
dev_dbg(dev, "SetHubFeature\n");
/* No HUB features supported */
break;
case SetPortFeature:
dev_dbg(dev, "SetPortFeature\n");
if (wIndex != 1) {
dev_dbg(dev, " INVALID\n");
return -EINVAL;
}
switch (wValue) {
case USB_PORT_FEAT_SUSPEND:
dev_dbg(dev, " SUSPEND\n");
return -EINVAL;
case USB_PORT_FEAT_POWER:
dev_dbg(dev, " POWER\n");
return -EINVAL;
case USB_PORT_FEAT_RESET:
dev_dbg(dev, " RESET\n");
spin_lock_irqsave(&priv->lock, flags);
cvmx_usb_disable(&priv->usb);
if (cvmx_usb_enable(&priv->usb))
dev_dbg(dev, "Failed to enable the port\n");
spin_unlock_irqrestore(&priv->lock, flags);
return 0;
case USB_PORT_FEAT_INDICATOR:
dev_dbg(dev, " INDICATOR\n");
/* Not supported */
break;
default:
dev_dbg(dev, " UNKNOWN\n");
return -EINVAL;
}
break;
default:
dev_dbg(dev, "Unknown root hub request\n");
return -EINVAL;
}
return 0;
}
static const struct hc_driver octeon_hc_driver = {
.description = "Octeon USB",
.product_desc = "Octeon Host Controller",
.hcd_priv_size = sizeof(struct octeon_hcd),
.irq = octeon_usb_irq,
.flags = HCD_MEMORY | HCD_USB2,
.start = octeon_usb_start,
.stop = octeon_usb_stop,
.urb_enqueue = octeon_usb_urb_enqueue,
.urb_dequeue = octeon_usb_urb_dequeue,
.endpoint_disable = octeon_usb_endpoint_disable,
.get_frame_number = octeon_usb_get_frame_number,
.hub_status_data = octeon_usb_hub_status_data,
.hub_control = octeon_usb_hub_control,
};
static int octeon_usb_driver_probe(struct device *dev)
{
int status;
int usb_num = to_platform_device(dev)->id;
int irq = platform_get_irq(to_platform_device(dev), 0);
struct octeon_hcd *priv;
struct usb_hcd *hcd;
unsigned long flags;
/*
* Set the DMA mask to 64bits so we get buffers already translated for
* DMA.
*/
dev->coherent_dma_mask = ~0;
dev->dma_mask = &dev->coherent_dma_mask;
hcd = usb_create_hcd(&octeon_hc_driver, dev, dev_name(dev));
if (!hcd) {
dev_dbg(dev, "Failed to allocate memory for HCD\n");
return -1;
}
hcd->uses_new_polling = 1;
priv = (struct octeon_hcd *)hcd->hcd_priv;
spin_lock_init(&priv->lock);
tasklet_init(&priv->dequeue_tasklet, octeon_usb_urb_dequeue_work, (unsigned long)priv);
INIT_LIST_HEAD(&priv->dequeue_list);
status = cvmx_usb_initialize(&priv->usb, usb_num, CVMX_USB_INITIALIZE_FLAGS_CLOCK_AUTO);
if (status) {
dev_dbg(dev, "USB initialization failed with %d\n", status);
kfree(hcd);
return -1;
}
/* This delay is needed for CN3010, but I don't know why... */
mdelay(10);
spin_lock_irqsave(&priv->lock, flags);
cvmx_usb_poll(&priv->usb);
spin_unlock_irqrestore(&priv->lock, flags);
status = usb_add_hcd(hcd, irq, IRQF_SHARED);
if (status) {
dev_dbg(dev, "USB add HCD failed with %d\n", status);
kfree(hcd);
return -1;
}
dev_dbg(dev, "Registered HCD for port %d on irq %d\n", usb_num, irq);
return 0;
}
static int octeon_usb_driver_remove(struct device *dev)
{
int status;
struct usb_hcd *hcd = dev_get_drvdata(dev);
struct octeon_hcd *priv = hcd_to_octeon(hcd);
unsigned long flags;
usb_remove_hcd(hcd);
tasklet_kill(&priv->dequeue_tasklet);
spin_lock_irqsave(&priv->lock, flags);
status = cvmx_usb_shutdown(&priv->usb);
spin_unlock_irqrestore(&priv->lock, flags);
if (status)
dev_dbg(dev, "USB shutdown failed with %d\n", status);
kfree(hcd);
return 0;
}
static struct device_driver octeon_usb_driver = {
.name = "OcteonUSB",
.bus = &platform_bus_type,
.probe = octeon_usb_driver_probe,
.remove = octeon_usb_driver_remove,
};
#define MAX_USB_PORTS 10
static struct platform_device *pdev_glob[MAX_USB_PORTS];
static int octeon_usb_registered;
static int __init octeon_usb_module_init(void)
{
int num_devices = cvmx_usb_get_num_ports();
int device;
if (usb_disabled() || num_devices == 0)
return -ENODEV;
if (driver_register(&octeon_usb_driver))
return -ENOMEM;
octeon_usb_registered = 1;
/*
* Only cn52XX and cn56XX have DWC_OTG USB hardware and the
* IOB priority registers. Under heavy network load USB
* hardware can be starved by the IOB causing a crash. Give
* it a priority boost if it has been waiting more than 400
* cycles to avoid this situation.
*
* Testing indicates that a cnt_val of 8192 is not sufficient,
* but no failures are seen with 4096. We choose a value of
* 400 to give a safety factor of 10.
*/
if (OCTEON_IS_MODEL(OCTEON_CN52XX) || OCTEON_IS_MODEL(OCTEON_CN56XX)) {
union cvmx_iob_n2c_l2c_pri_cnt pri_cnt;
pri_cnt.u64 = 0;
pri_cnt.s.cnt_enb = 1;
pri_cnt.s.cnt_val = 400;
cvmx_write_csr(CVMX_IOB_N2C_L2C_PRI_CNT, pri_cnt.u64);
}
for (device = 0; device < num_devices; device++) {
struct resource irq_resource;
struct platform_device *pdev;
memset(&irq_resource, 0, sizeof(irq_resource));
irq_resource.start = (device == 0) ? OCTEON_IRQ_USB0 : OCTEON_IRQ_USB1;
irq_resource.end = irq_resource.start;
irq_resource.flags = IORESOURCE_IRQ;
pdev = platform_device_register_simple((char *)octeon_usb_driver. name, device, &irq_resource, 1);
if (IS_ERR(pdev)) {
driver_unregister(&octeon_usb_driver);
octeon_usb_registered = 0;
return PTR_ERR(pdev);
}
if (device < MAX_USB_PORTS)
pdev_glob[device] = pdev;
}
return 0;
}
static void __exit octeon_usb_module_cleanup(void)
{
int i;
for (i = 0; i < MAX_USB_PORTS; i++)
if (pdev_glob[i]) {
platform_device_unregister(pdev_glob[i]);
pdev_glob[i] = NULL;
}
if (octeon_usb_registered)
driver_unregister(&octeon_usb_driver);
}
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Cavium Networks <support@caviumnetworks.com>");
MODULE_DESCRIPTION("Cavium Networks Octeon USB Host driver.");
module_init(octeon_usb_module_init);
module_exit(octeon_usb_module_cleanup);
