diff options
Diffstat (limited to 'drivers/staging/octeon-usb/octeon-hcd.c')
| -rw-r--r-- | drivers/staging/octeon-usb/octeon-hcd.c | 832 |
1 files changed, 832 insertions, 0 deletions
diff --git a/drivers/staging/octeon-usb/octeon-hcd.c b/drivers/staging/octeon-usb/octeon-hcd.c new file mode 100644 index 000000000000..d156b603ae65 --- /dev/null +++ b/drivers/staging/octeon-usb/octeon-hcd.c @@ -0,0 +1,832 @@ +/* + * 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); |