2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
6 * Copyright (C) 2008 Cavium Networks
8 #include <linux/kernel.h>
9 #include <linux/module.h>
10 #include <linux/init.h>
11 #include <linux/pci.h>
12 #include <linux/interrupt.h>
13 #include <linux/platform_device.h>
14 #include <linux/usb.h>
16 #include <linux/time.h>
17 #include <linux/delay.h>
19 #include <asm/octeon/cvmx.h>
21 #include <asm/octeon/cvmx-iob-defs.h>
23 #include <linux/usb/hcd.h>
25 #include <linux/err.h>
29 struct cvmx_usb_state usb;
30 struct tasklet_struct dequeue_tasklet;
31 struct list_head dequeue_list;
34 /* convert between an HCD pointer and the corresponding struct octeon_hcd */
35 static inline struct octeon_hcd *hcd_to_octeon(struct usb_hcd *hcd)
37 return (struct octeon_hcd *)(hcd->hcd_priv);
40 static inline struct usb_hcd *octeon_to_hcd(struct octeon_hcd *p)
42 return container_of((void *)p, struct usb_hcd, hcd_priv);
45 static inline struct octeon_hcd *cvmx_usb_to_octeon(struct cvmx_usb_state *p)
47 return container_of(p, struct octeon_hcd, usb);
50 static irqreturn_t octeon_usb_irq(struct usb_hcd *hcd)
52 struct octeon_hcd *priv = hcd_to_octeon(hcd);
55 spin_lock_irqsave(&priv->lock, flags);
56 cvmx_usb_poll(&priv->usb);
57 spin_unlock_irqrestore(&priv->lock, flags);
61 static void octeon_usb_port_callback(struct cvmx_usb_state *usb,
62 enum cvmx_usb_callback reason,
63 enum cvmx_usb_complete status,
66 int bytes_transferred,
69 struct octeon_hcd *priv = cvmx_usb_to_octeon(usb);
71 spin_unlock(&priv->lock);
72 usb_hcd_poll_rh_status(octeon_to_hcd(priv));
73 spin_lock(&priv->lock);
76 static int octeon_usb_start(struct usb_hcd *hcd)
78 struct octeon_hcd *priv = hcd_to_octeon(hcd);
81 hcd->state = HC_STATE_RUNNING;
82 spin_lock_irqsave(&priv->lock, flags);
83 cvmx_usb_register_callback(&priv->usb, CVMX_USB_CALLBACK_PORT_CHANGED,
84 octeon_usb_port_callback, NULL);
85 spin_unlock_irqrestore(&priv->lock, flags);
89 static void octeon_usb_stop(struct usb_hcd *hcd)
91 struct octeon_hcd *priv = hcd_to_octeon(hcd);
94 spin_lock_irqsave(&priv->lock, flags);
95 cvmx_usb_register_callback(&priv->usb, CVMX_USB_CALLBACK_PORT_CHANGED,
97 spin_unlock_irqrestore(&priv->lock, flags);
98 hcd->state = HC_STATE_HALT;
101 static int octeon_usb_get_frame_number(struct usb_hcd *hcd)
103 struct octeon_hcd *priv = hcd_to_octeon(hcd);
105 return cvmx_usb_get_frame_number(&priv->usb);
108 static void octeon_usb_urb_complete_callback(struct cvmx_usb_state *usb,
109 enum cvmx_usb_callback reason,
110 enum cvmx_usb_complete status,
113 int bytes_transferred,
116 struct octeon_hcd *priv = cvmx_usb_to_octeon(usb);
117 struct usb_hcd *hcd = octeon_to_hcd(priv);
118 struct device *dev = hcd->self.controller;
119 struct urb *urb = user_data;
121 urb->actual_length = bytes_transferred;
124 if (!list_empty(&urb->urb_list)) {
126 * It is on the dequeue_list, but we are going to call
127 * usb_hcd_giveback_urb(), so we must clear it from
128 * the list. We got to it before the
129 * octeon_usb_urb_dequeue_work() tasklet did.
131 list_del(&urb->urb_list);
132 /* No longer on the dequeue_list. */
133 INIT_LIST_HEAD(&urb->urb_list);
136 /* For Isochronous transactions we need to update the URB packet status
137 list from data in our private copy */
138 if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
141 * The pointer to the private list is stored in the setup_packet
144 struct cvmx_usb_iso_packet *iso_packet =
145 (struct cvmx_usb_iso_packet *) urb->setup_packet;
146 /* Recalculate the transfer size by adding up each packet */
147 urb->actual_length = 0;
148 for (i = 0; i < urb->number_of_packets; i++) {
149 if (iso_packet[i].status == CVMX_USB_COMPLETE_SUCCESS) {
150 urb->iso_frame_desc[i].status = 0;
151 urb->iso_frame_desc[i].actual_length = iso_packet[i].length;
152 urb->actual_length += urb->iso_frame_desc[i].actual_length;
154 dev_dbg(dev, "ISOCHRONOUS packet=%d of %d status=%d pipe=%d submit=%d size=%d\n",
155 i, urb->number_of_packets,
156 iso_packet[i].status, pipe_handle,
157 submit_handle, iso_packet[i].length);
158 urb->iso_frame_desc[i].status = -EREMOTEIO;
161 /* Free the private list now that we don't need it anymore */
163 urb->setup_packet = NULL;
167 case CVMX_USB_COMPLETE_SUCCESS:
170 case CVMX_USB_COMPLETE_CANCEL:
171 if (urb->status == 0)
172 urb->status = -ENOENT;
174 case CVMX_USB_COMPLETE_STALL:
175 dev_dbg(dev, "status=stall pipe=%d submit=%d size=%d\n",
176 pipe_handle, submit_handle, bytes_transferred);
177 urb->status = -EPIPE;
179 case CVMX_USB_COMPLETE_BABBLEERR:
180 dev_dbg(dev, "status=babble pipe=%d submit=%d size=%d\n",
181 pipe_handle, submit_handle, bytes_transferred);
182 urb->status = -EPIPE;
184 case CVMX_USB_COMPLETE_SHORT:
185 dev_dbg(dev, "status=short pipe=%d submit=%d size=%d\n",
186 pipe_handle, submit_handle, bytes_transferred);
187 urb->status = -EREMOTEIO;
189 case CVMX_USB_COMPLETE_ERROR:
190 case CVMX_USB_COMPLETE_XACTERR:
191 case CVMX_USB_COMPLETE_DATATGLERR:
192 case CVMX_USB_COMPLETE_FRAMEERR:
193 dev_dbg(dev, "status=%d pipe=%d submit=%d size=%d\n",
194 status, pipe_handle, submit_handle, bytes_transferred);
195 urb->status = -EPROTO;
198 spin_unlock(&priv->lock);
199 usb_hcd_giveback_urb(octeon_to_hcd(priv), urb, urb->status);
200 spin_lock(&priv->lock);
203 static int octeon_usb_urb_enqueue(struct usb_hcd *hcd,
207 struct octeon_hcd *priv = hcd_to_octeon(hcd);
208 struct device *dev = hcd->self.controller;
209 int submit_handle = -1;
212 struct cvmx_usb_iso_packet *iso_packet;
213 struct usb_host_endpoint *ep = urb->ep;
216 INIT_LIST_HEAD(&urb->urb_list); /* not enqueued on dequeue_list */
217 spin_lock_irqsave(&priv->lock, flags);
220 enum cvmx_usb_transfer transfer_type;
221 enum cvmx_usb_speed speed;
222 int split_device = 0;
224 switch (usb_pipetype(urb->pipe)) {
225 case PIPE_ISOCHRONOUS:
226 transfer_type = CVMX_USB_TRANSFER_ISOCHRONOUS;
229 transfer_type = CVMX_USB_TRANSFER_INTERRUPT;
232 transfer_type = CVMX_USB_TRANSFER_CONTROL;
235 transfer_type = CVMX_USB_TRANSFER_BULK;
238 switch (urb->dev->speed) {
240 speed = CVMX_USB_SPEED_LOW;
243 speed = CVMX_USB_SPEED_FULL;
246 speed = CVMX_USB_SPEED_HIGH;
250 * For slow devices on high speed ports we need to find the hub
251 * that does the speed translation so we know where to send the
252 * split transactions.
254 if (speed != CVMX_USB_SPEED_HIGH) {
256 * Start at this device and work our way up the usb
259 struct usb_device *dev = urb->dev;
260 while (dev->parent) {
262 * If our parent is high speed then he'll
263 * receive the splits.
265 if (dev->parent->speed == USB_SPEED_HIGH) {
266 split_device = dev->parent->devnum;
267 split_port = dev->portnum;
271 * Move up the tree one level. If we make it all
272 * the way up the tree, then the port must not
273 * be in high speed mode and we don't need a
279 pipe_handle = cvmx_usb_open_pipe(&priv->usb,
281 usb_pipedevice(urb->pipe),
282 usb_pipeendpoint(urb->pipe),
284 le16_to_cpu(ep->desc.wMaxPacketSize) & 0x7ff,
286 usb_pipein(urb->pipe) ? CVMX_USB_DIRECTION_IN : CVMX_USB_DIRECTION_OUT,
288 (le16_to_cpu(ep->desc.wMaxPacketSize) >> 11) & 0x3,
291 if (pipe_handle < 0) {
292 spin_unlock_irqrestore(&priv->lock, flags);
293 dev_dbg(dev, "Failed to create pipe\n");
296 ep->hcpriv = (void *)(0x10000L + pipe_handle);
298 pipe_handle = 0xffff & (long)ep->hcpriv;
301 switch (usb_pipetype(urb->pipe)) {
302 case PIPE_ISOCHRONOUS:
303 dev_dbg(dev, "Submit isochronous to %d.%d\n",
304 usb_pipedevice(urb->pipe), usb_pipeendpoint(urb->pipe));
306 * Allocate a structure to use for our private list of
307 * isochronous packets.
309 iso_packet = kmalloc(urb->number_of_packets *
310 sizeof(struct cvmx_usb_iso_packet),
314 /* Fill the list with the data from the URB */
315 for (i = 0; i < urb->number_of_packets; i++) {
316 iso_packet[i].offset = urb->iso_frame_desc[i].offset;
317 iso_packet[i].length = urb->iso_frame_desc[i].length;
318 iso_packet[i].status = CVMX_USB_COMPLETE_ERROR;
321 * Store a pointer to the list in the URB setup_packet
322 * field. We know this currently isn't being used and
323 * this saves us a bunch of logic.
325 urb->setup_packet = (char *)iso_packet;
326 submit_handle = cvmx_usb_submit_isochronous(&priv->usb, pipe_handle,
328 urb->number_of_packets,
331 urb->transfer_buffer_length,
332 octeon_usb_urb_complete_callback,
335 * If submit failed we need to free our private packet
338 if (submit_handle < 0) {
339 urb->setup_packet = NULL;
345 dev_dbg(dev, "Submit interrupt to %d.%d\n",
346 usb_pipedevice(urb->pipe), usb_pipeendpoint(urb->pipe));
347 submit_handle = cvmx_usb_submit_interrupt(&priv->usb, pipe_handle,
349 urb->transfer_buffer_length,
350 octeon_usb_urb_complete_callback,
354 dev_dbg(dev, "Submit control to %d.%d\n",
355 usb_pipedevice(urb->pipe), usb_pipeendpoint(urb->pipe));
356 submit_handle = cvmx_usb_submit_control(&priv->usb, pipe_handle,
359 urb->transfer_buffer_length,
360 octeon_usb_urb_complete_callback,
364 dev_dbg(dev, "Submit bulk to %d.%d\n",
365 usb_pipedevice(urb->pipe), usb_pipeendpoint(urb->pipe));
366 submit_handle = cvmx_usb_submit_bulk(&priv->usb, pipe_handle,
368 urb->transfer_buffer_length,
369 octeon_usb_urb_complete_callback,
373 if (submit_handle < 0) {
374 spin_unlock_irqrestore(&priv->lock, flags);
375 dev_dbg(dev, "Failed to submit\n");
378 urb->hcpriv = (void *)(long)(((submit_handle & 0xffff) << 16) | pipe_handle);
379 spin_unlock_irqrestore(&priv->lock, flags);
383 static void octeon_usb_urb_dequeue_work(unsigned long arg)
386 struct octeon_hcd *priv = (struct octeon_hcd *)arg;
388 spin_lock_irqsave(&priv->lock, flags);
390 while (!list_empty(&priv->dequeue_list)) {
393 struct urb *urb = container_of(priv->dequeue_list.next, struct urb, urb_list);
394 list_del(&urb->urb_list);
395 /* not enqueued on dequeue_list */
396 INIT_LIST_HEAD(&urb->urb_list);
397 pipe_handle = 0xffff & (long)urb->hcpriv;
398 submit_handle = ((long)urb->hcpriv) >> 16;
399 cvmx_usb_cancel(&priv->usb, pipe_handle, submit_handle);
402 spin_unlock_irqrestore(&priv->lock, flags);
405 static int octeon_usb_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
407 struct octeon_hcd *priv = hcd_to_octeon(hcd);
413 spin_lock_irqsave(&priv->lock, flags);
415 urb->status = status;
416 list_add_tail(&urb->urb_list, &priv->dequeue_list);
418 spin_unlock_irqrestore(&priv->lock, flags);
420 tasklet_schedule(&priv->dequeue_tasklet);
425 static void octeon_usb_endpoint_disable(struct usb_hcd *hcd, struct usb_host_endpoint *ep)
427 struct device *dev = hcd->self.controller;
430 struct octeon_hcd *priv = hcd_to_octeon(hcd);
431 int pipe_handle = 0xffff & (long)ep->hcpriv;
433 spin_lock_irqsave(&priv->lock, flags);
434 cvmx_usb_cancel_all(&priv->usb, pipe_handle);
435 if (cvmx_usb_close_pipe(&priv->usb, pipe_handle))
436 dev_dbg(dev, "Closing pipe %d failed\n", pipe_handle);
437 spin_unlock_irqrestore(&priv->lock, flags);
442 static int octeon_usb_hub_status_data(struct usb_hcd *hcd, char *buf)
444 struct octeon_hcd *priv = hcd_to_octeon(hcd);
445 struct cvmx_usb_port_status port_status;
448 spin_lock_irqsave(&priv->lock, flags);
449 port_status = cvmx_usb_get_status(&priv->usb);
450 spin_unlock_irqrestore(&priv->lock, flags);
452 buf[0] = port_status.connect_change << 1;
454 return (buf[0] != 0);
457 static int octeon_usb_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue, u16 wIndex, char *buf, u16 wLength)
459 struct octeon_hcd *priv = hcd_to_octeon(hcd);
460 struct device *dev = hcd->self.controller;
461 struct cvmx_usb_port_status usb_port_status;
463 struct usb_hub_descriptor *desc;
467 case ClearHubFeature:
468 dev_dbg(dev, "ClearHubFeature\n");
470 case C_HUB_LOCAL_POWER:
471 case C_HUB_OVER_CURRENT:
472 /* Nothing required here */
478 case ClearPortFeature:
479 dev_dbg(dev, "ClearPortFeature\n");
481 dev_dbg(dev, " INVALID\n");
486 case USB_PORT_FEAT_ENABLE:
487 dev_dbg(dev, " ENABLE\n");
488 spin_lock_irqsave(&priv->lock, flags);
489 cvmx_usb_disable(&priv->usb);
490 spin_unlock_irqrestore(&priv->lock, flags);
492 case USB_PORT_FEAT_SUSPEND:
493 dev_dbg(dev, " SUSPEND\n");
494 /* Not supported on Octeon */
496 case USB_PORT_FEAT_POWER:
497 dev_dbg(dev, " POWER\n");
498 /* Not supported on Octeon */
500 case USB_PORT_FEAT_INDICATOR:
501 dev_dbg(dev, " INDICATOR\n");
502 /* Port inidicator not supported */
504 case USB_PORT_FEAT_C_CONNECTION:
505 dev_dbg(dev, " C_CONNECTION\n");
506 /* Clears drivers internal connect status change flag */
507 spin_lock_irqsave(&priv->lock, flags);
508 cvmx_usb_set_status(&priv->usb, cvmx_usb_get_status(&priv->usb));
509 spin_unlock_irqrestore(&priv->lock, flags);
511 case USB_PORT_FEAT_C_RESET:
512 dev_dbg(dev, " C_RESET\n");
514 * Clears the driver's internal Port Reset Change flag.
516 spin_lock_irqsave(&priv->lock, flags);
517 cvmx_usb_set_status(&priv->usb, cvmx_usb_get_status(&priv->usb));
518 spin_unlock_irqrestore(&priv->lock, flags);
520 case USB_PORT_FEAT_C_ENABLE:
521 dev_dbg(dev, " C_ENABLE\n");
523 * Clears the driver's internal Port Enable/Disable
526 spin_lock_irqsave(&priv->lock, flags);
527 cvmx_usb_set_status(&priv->usb, cvmx_usb_get_status(&priv->usb));
528 spin_unlock_irqrestore(&priv->lock, flags);
530 case USB_PORT_FEAT_C_SUSPEND:
531 dev_dbg(dev, " C_SUSPEND\n");
533 * Clears the driver's internal Port Suspend Change
534 * flag, which is set when resume signaling on the host
538 case USB_PORT_FEAT_C_OVER_CURRENT:
539 dev_dbg(dev, " C_OVER_CURRENT\n");
540 /* Clears the driver's overcurrent Change flag */
541 spin_lock_irqsave(&priv->lock, flags);
542 cvmx_usb_set_status(&priv->usb, cvmx_usb_get_status(&priv->usb));
543 spin_unlock_irqrestore(&priv->lock, flags);
546 dev_dbg(dev, " UNKNOWN\n");
550 case GetHubDescriptor:
551 dev_dbg(dev, "GetHubDescriptor\n");
552 desc = (struct usb_hub_descriptor *)buf;
553 desc->bDescLength = 9;
554 desc->bDescriptorType = 0x29;
556 desc->wHubCharacteristics = 0x08;
557 desc->bPwrOn2PwrGood = 1;
558 desc->bHubContrCurrent = 0;
559 desc->u.hs.DeviceRemovable[0] = 0;
560 desc->u.hs.DeviceRemovable[1] = 0xff;
563 dev_dbg(dev, "GetHubStatus\n");
567 dev_dbg(dev, "GetPortStatus\n");
569 dev_dbg(dev, " INVALID\n");
573 spin_lock_irqsave(&priv->lock, flags);
574 usb_port_status = cvmx_usb_get_status(&priv->usb);
575 spin_unlock_irqrestore(&priv->lock, flags);
578 if (usb_port_status.connect_change) {
579 port_status |= (1 << USB_PORT_FEAT_C_CONNECTION);
580 dev_dbg(dev, " C_CONNECTION\n");
583 if (usb_port_status.port_enabled) {
584 port_status |= (1 << USB_PORT_FEAT_C_ENABLE);
585 dev_dbg(dev, " C_ENABLE\n");
588 if (usb_port_status.connected) {
589 port_status |= (1 << USB_PORT_FEAT_CONNECTION);
590 dev_dbg(dev, " CONNECTION\n");
593 if (usb_port_status.port_enabled) {
594 port_status |= (1 << USB_PORT_FEAT_ENABLE);
595 dev_dbg(dev, " ENABLE\n");
598 if (usb_port_status.port_over_current) {
599 port_status |= (1 << USB_PORT_FEAT_OVER_CURRENT);
600 dev_dbg(dev, " OVER_CURRENT\n");
603 if (usb_port_status.port_powered) {
604 port_status |= (1 << USB_PORT_FEAT_POWER);
605 dev_dbg(dev, " POWER\n");
608 if (usb_port_status.port_speed == CVMX_USB_SPEED_HIGH) {
609 port_status |= USB_PORT_STAT_HIGH_SPEED;
610 dev_dbg(dev, " HIGHSPEED\n");
611 } else if (usb_port_status.port_speed == CVMX_USB_SPEED_LOW) {
612 port_status |= (1 << USB_PORT_FEAT_LOWSPEED);
613 dev_dbg(dev, " LOWSPEED\n");
616 *((__le32 *) buf) = cpu_to_le32(port_status);
619 dev_dbg(dev, "SetHubFeature\n");
620 /* No HUB features supported */
623 dev_dbg(dev, "SetPortFeature\n");
625 dev_dbg(dev, " INVALID\n");
630 case USB_PORT_FEAT_SUSPEND:
631 dev_dbg(dev, " SUSPEND\n");
633 case USB_PORT_FEAT_POWER:
634 dev_dbg(dev, " POWER\n");
636 case USB_PORT_FEAT_RESET:
637 dev_dbg(dev, " RESET\n");
638 spin_lock_irqsave(&priv->lock, flags);
639 cvmx_usb_disable(&priv->usb);
640 if (cvmx_usb_enable(&priv->usb))
641 dev_dbg(dev, "Failed to enable the port\n");
642 spin_unlock_irqrestore(&priv->lock, flags);
644 case USB_PORT_FEAT_INDICATOR:
645 dev_dbg(dev, " INDICATOR\n");
649 dev_dbg(dev, " UNKNOWN\n");
654 dev_dbg(dev, "Unknown root hub request\n");
661 static const struct hc_driver octeon_hc_driver = {
662 .description = "Octeon USB",
663 .product_desc = "Octeon Host Controller",
664 .hcd_priv_size = sizeof(struct octeon_hcd),
665 .irq = octeon_usb_irq,
666 .flags = HCD_MEMORY | HCD_USB2,
667 .start = octeon_usb_start,
668 .stop = octeon_usb_stop,
669 .urb_enqueue = octeon_usb_urb_enqueue,
670 .urb_dequeue = octeon_usb_urb_dequeue,
671 .endpoint_disable = octeon_usb_endpoint_disable,
672 .get_frame_number = octeon_usb_get_frame_number,
673 .hub_status_data = octeon_usb_hub_status_data,
674 .hub_control = octeon_usb_hub_control,
678 static int octeon_usb_driver_probe(struct device *dev)
681 int usb_num = to_platform_device(dev)->id;
682 int irq = platform_get_irq(to_platform_device(dev), 0);
683 struct octeon_hcd *priv;
688 * Set the DMA mask to 64bits so we get buffers already translated for
691 dev->coherent_dma_mask = ~0;
692 dev->dma_mask = &dev->coherent_dma_mask;
694 hcd = usb_create_hcd(&octeon_hc_driver, dev, dev_name(dev));
696 dev_dbg(dev, "Failed to allocate memory for HCD\n");
699 hcd->uses_new_polling = 1;
700 priv = (struct octeon_hcd *)hcd->hcd_priv;
702 spin_lock_init(&priv->lock);
704 tasklet_init(&priv->dequeue_tasklet, octeon_usb_urb_dequeue_work, (unsigned long)priv);
705 INIT_LIST_HEAD(&priv->dequeue_list);
707 status = cvmx_usb_initialize(&priv->usb, usb_num);
709 dev_dbg(dev, "USB initialization failed with %d\n", status);
714 /* This delay is needed for CN3010, but I don't know why... */
717 spin_lock_irqsave(&priv->lock, flags);
718 cvmx_usb_poll(&priv->usb);
719 spin_unlock_irqrestore(&priv->lock, flags);
721 status = usb_add_hcd(hcd, irq, IRQF_SHARED);
723 dev_dbg(dev, "USB add HCD failed with %d\n", status);
728 dev_dbg(dev, "Registered HCD for port %d on irq %d\n", usb_num, irq);
733 static int octeon_usb_driver_remove(struct device *dev)
736 struct usb_hcd *hcd = dev_get_drvdata(dev);
737 struct octeon_hcd *priv = hcd_to_octeon(hcd);
741 tasklet_kill(&priv->dequeue_tasklet);
742 spin_lock_irqsave(&priv->lock, flags);
743 status = cvmx_usb_shutdown(&priv->usb);
744 spin_unlock_irqrestore(&priv->lock, flags);
746 dev_dbg(dev, "USB shutdown failed with %d\n", status);
753 static struct device_driver octeon_usb_driver = {
755 .bus = &platform_bus_type,
756 .probe = octeon_usb_driver_probe,
757 .remove = octeon_usb_driver_remove,
761 #define MAX_USB_PORTS 10
762 static struct platform_device *pdev_glob[MAX_USB_PORTS];
763 static int octeon_usb_registered;
764 static int __init octeon_usb_module_init(void)
766 int num_devices = cvmx_usb_get_num_ports();
769 if (usb_disabled() || num_devices == 0)
772 if (driver_register(&octeon_usb_driver))
775 octeon_usb_registered = 1;
778 * Only cn52XX and cn56XX have DWC_OTG USB hardware and the
779 * IOB priority registers. Under heavy network load USB
780 * hardware can be starved by the IOB causing a crash. Give
781 * it a priority boost if it has been waiting more than 400
782 * cycles to avoid this situation.
784 * Testing indicates that a cnt_val of 8192 is not sufficient,
785 * but no failures are seen with 4096. We choose a value of
786 * 400 to give a safety factor of 10.
788 if (OCTEON_IS_MODEL(OCTEON_CN52XX) || OCTEON_IS_MODEL(OCTEON_CN56XX)) {
789 union cvmx_iob_n2c_l2c_pri_cnt pri_cnt;
792 pri_cnt.s.cnt_enb = 1;
793 pri_cnt.s.cnt_val = 400;
794 cvmx_write_csr(CVMX_IOB_N2C_L2C_PRI_CNT, pri_cnt.u64);
797 for (device = 0; device < num_devices; device++) {
798 struct resource irq_resource;
799 struct platform_device *pdev;
800 memset(&irq_resource, 0, sizeof(irq_resource));
801 irq_resource.start = (device == 0) ? OCTEON_IRQ_USB0 : OCTEON_IRQ_USB1;
802 irq_resource.end = irq_resource.start;
803 irq_resource.flags = IORESOURCE_IRQ;
804 pdev = platform_device_register_simple((char *)octeon_usb_driver. name, device, &irq_resource, 1);
806 driver_unregister(&octeon_usb_driver);
807 octeon_usb_registered = 0;
808 return PTR_ERR(pdev);
810 if (device < MAX_USB_PORTS)
811 pdev_glob[device] = pdev;
817 static void __exit octeon_usb_module_cleanup(void)
821 for (i = 0; i < MAX_USB_PORTS; i++)
823 platform_device_unregister(pdev_glob[i]);
826 if (octeon_usb_registered)
827 driver_unregister(&octeon_usb_driver);
830 MODULE_LICENSE("GPL");
831 MODULE_AUTHOR("Cavium Networks <support@caviumnetworks.com>");
832 MODULE_DESCRIPTION("Cavium Networks Octeon USB Host driver.");
833 module_init(octeon_usb_module_init);
834 module_exit(octeon_usb_module_cleanup);