/* * 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 #include #include #include #include #include #include #include #include #include #include "cvmx-usb.h" #include #include #include 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 "); MODULE_DESCRIPTION("Cavium Networks Octeon USB Host driver."); module_init(octeon_usb_module_init); module_exit(octeon_usb_module_cleanup);