diff options
Diffstat (limited to 'drivers/usb/core/hcd.c')
| -rw-r--r-- | drivers/usb/core/hcd.c | 216 |
1 files changed, 176 insertions, 40 deletions
diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c index d5ed3fa9e30..e52ed1663b3 100644 --- a/drivers/usb/core/hcd.c +++ b/drivers/usb/core/hcd.c @@ -35,6 +35,7 @@ #include <linux/mutex.h> #include <asm/irq.h> #include <asm/byteorder.h> +#include <asm/unaligned.h> #include <linux/platform_device.h> #include <linux/workqueue.h> @@ -131,8 +132,8 @@ static const u8 usb2_rh_dev_descriptor [18] = { 0x01, /* __u8 bDeviceProtocol; [ usb 2.0 single TT ]*/ 0x40, /* __u8 bMaxPacketSize0; 64 Bytes */ - 0x00, 0x00, /* __le16 idVendor; */ - 0x00, 0x00, /* __le16 idProduct; */ + 0x6b, 0x1d, /* __le16 idVendor; Linux Foundation */ + 0x02, 0x00, /* __le16 idProduct; device 0x0002 */ KERNEL_VER, KERNEL_REL, /* __le16 bcdDevice */ 0x03, /* __u8 iManufacturer; */ @@ -154,8 +155,8 @@ static const u8 usb11_rh_dev_descriptor [18] = { 0x00, /* __u8 bDeviceProtocol; [ low/full speeds only ] */ 0x40, /* __u8 bMaxPacketSize0; 64 Bytes */ - 0x00, 0x00, /* __le16 idVendor; */ - 0x00, 0x00, /* __le16 idProduct; */ + 0x6b, 0x1d, /* __le16 idVendor; Linux Foundation */ + 0x01, 0x00, /* __le16 idProduct; device 0x0001 */ KERNEL_VER, KERNEL_REL, /* __le16 bcdDevice */ 0x03, /* __u8 iManufacturer; */ @@ -807,13 +808,13 @@ static int usb_register_bus(struct usb_bus *bus) } set_bit (busnum, busmap.busmap); bus->busnum = busnum; - bus->class_dev = class_device_create(usb_host_class, NULL, MKDEV(0,0), - bus->controller, "usb_host%d", - busnum); - result = PTR_ERR(bus->class_dev); - if (IS_ERR(bus->class_dev)) + + bus->dev = device_create(usb_host_class, bus->controller, MKDEV(0, 0), + "usb_host%d", busnum); + result = PTR_ERR(bus->dev); + if (IS_ERR(bus->dev)) goto error_create_class_dev; - class_set_devdata(bus->class_dev, bus); + dev_set_drvdata(bus->dev, bus); /* Add it to the local list of buses */ list_add (&bus->bus_list, &usb_bus_list); @@ -857,7 +858,7 @@ static void usb_deregister_bus (struct usb_bus *bus) clear_bit (bus->busnum, busmap.busmap); - class_device_unregister(bus->class_dev); + device_unregister(bus->dev); } /** @@ -970,7 +971,7 @@ long usb_calc_bus_time (int speed, int is_input, int isoc, int bytecount) return -1; } } -EXPORT_SYMBOL (usb_calc_bus_time); +EXPORT_SYMBOL_GPL(usb_calc_bus_time); /*-------------------------------------------------------------------------*/ @@ -1112,48 +1113,177 @@ void usb_hcd_unlink_urb_from_ep(struct usb_hcd *hcd, struct urb *urb) } EXPORT_SYMBOL_GPL(usb_hcd_unlink_urb_from_ep); -static void map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb) +/* + * Some usb host controllers can only perform dma using a small SRAM area. + * The usb core itself is however optimized for host controllers that can dma + * using regular system memory - like pci devices doing bus mastering. + * + * To support host controllers with limited dma capabilites we provide dma + * bounce buffers. This feature can be enabled using the HCD_LOCAL_MEM flag. + * For this to work properly the host controller code must first use the + * function dma_declare_coherent_memory() to point out which memory area + * that should be used for dma allocations. + * + * The HCD_LOCAL_MEM flag then tells the usb code to allocate all data for + * dma using dma_alloc_coherent() which in turn allocates from the memory + * area pointed out with dma_declare_coherent_memory(). + * + * So, to summarize... + * + * - We need "local" memory, canonical example being + * a small SRAM on a discrete controller being the + * only memory that the controller can read ... + * (a) "normal" kernel memory is no good, and + * (b) there's not enough to share + * + * - The only *portable* hook for such stuff in the + * DMA framework is dma_declare_coherent_memory() + * + * - So we use that, even though the primary requirement + * is that the memory be "local" (hence addressible + * by that device), not "coherent". + * + */ + +static int hcd_alloc_coherent(struct usb_bus *bus, + gfp_t mem_flags, dma_addr_t *dma_handle, + void **vaddr_handle, size_t size, + enum dma_data_direction dir) +{ + unsigned char *vaddr; + + vaddr = hcd_buffer_alloc(bus, size + sizeof(vaddr), + mem_flags, dma_handle); + if (!vaddr) + return -ENOMEM; + + /* + * Store the virtual address of the buffer at the end + * of the allocated dma buffer. The size of the buffer + * may be uneven so use unaligned functions instead + * of just rounding up. It makes sense to optimize for + * memory footprint over access speed since the amount + * of memory available for dma may be limited. + */ + put_unaligned((unsigned long)*vaddr_handle, + (unsigned long *)(vaddr + size)); + + if (dir == DMA_TO_DEVICE) + memcpy(vaddr, *vaddr_handle, size); + + *vaddr_handle = vaddr; + return 0; +} + +static void hcd_free_coherent(struct usb_bus *bus, dma_addr_t *dma_handle, + void **vaddr_handle, size_t size, + enum dma_data_direction dir) +{ + unsigned char *vaddr = *vaddr_handle; + + vaddr = (void *)get_unaligned((unsigned long *)(vaddr + size)); + + if (dir == DMA_FROM_DEVICE) + memcpy(vaddr, *vaddr_handle, size); + + hcd_buffer_free(bus, size + sizeof(vaddr), *vaddr_handle, *dma_handle); + + *vaddr_handle = vaddr; + *dma_handle = 0; +} + +static int map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb, + gfp_t mem_flags) { + enum dma_data_direction dir; + int ret = 0; + /* Map the URB's buffers for DMA access. * Lower level HCD code should use *_dma exclusively, * unless it uses pio or talks to another transport. */ - if (hcd->self.uses_dma && !is_root_hub(urb->dev)) { - if (usb_endpoint_xfer_control(&urb->ep->desc) - && !(urb->transfer_flags & URB_NO_SETUP_DMA_MAP)) - urb->setup_dma = dma_map_single ( + if (is_root_hub(urb->dev)) + return 0; + + if (usb_endpoint_xfer_control(&urb->ep->desc) + && !(urb->transfer_flags & URB_NO_SETUP_DMA_MAP)) { + if (hcd->self.uses_dma) + urb->setup_dma = dma_map_single( hcd->self.controller, urb->setup_packet, - sizeof (struct usb_ctrlrequest), + sizeof(struct usb_ctrlrequest), + DMA_TO_DEVICE); + else if (hcd->driver->flags & HCD_LOCAL_MEM) + ret = hcd_alloc_coherent( + urb->dev->bus, mem_flags, + &urb->setup_dma, + (void **)&urb->setup_packet, + sizeof(struct usb_ctrlrequest), DMA_TO_DEVICE); - if (urb->transfer_buffer_length != 0 - && !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP)) + } + + dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE; + if (ret == 0 && urb->transfer_buffer_length != 0 + && !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP)) { + if (hcd->self.uses_dma) urb->transfer_dma = dma_map_single ( hcd->self.controller, urb->transfer_buffer, urb->transfer_buffer_length, - usb_urb_dir_in(urb) - ? DMA_FROM_DEVICE - : DMA_TO_DEVICE); + dir); + else if (hcd->driver->flags & HCD_LOCAL_MEM) { + ret = hcd_alloc_coherent( + urb->dev->bus, mem_flags, + &urb->transfer_dma, + &urb->transfer_buffer, + urb->transfer_buffer_length, + dir); + + if (ret && usb_endpoint_xfer_control(&urb->ep->desc) + && !(urb->transfer_flags & URB_NO_SETUP_DMA_MAP)) + hcd_free_coherent(urb->dev->bus, + &urb->setup_dma, + (void **)&urb->setup_packet, + sizeof(struct usb_ctrlrequest), + DMA_TO_DEVICE); + } } + return ret; } static void unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb) { - if (hcd->self.uses_dma && !is_root_hub(urb->dev)) { - if (usb_endpoint_xfer_control(&urb->ep->desc) - && !(urb->transfer_flags & URB_NO_SETUP_DMA_MAP)) + enum dma_data_direction dir; + + if (is_root_hub(urb->dev)) + return; + + if (usb_endpoint_xfer_control(&urb->ep->desc) + && !(urb->transfer_flags & URB_NO_SETUP_DMA_MAP)) { + if (hcd->self.uses_dma) dma_unmap_single(hcd->self.controller, urb->setup_dma, sizeof(struct usb_ctrlrequest), DMA_TO_DEVICE); - if (urb->transfer_buffer_length != 0 - && !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP)) + else if (hcd->driver->flags & HCD_LOCAL_MEM) + hcd_free_coherent(urb->dev->bus, &urb->setup_dma, + (void **)&urb->setup_packet, + sizeof(struct usb_ctrlrequest), + DMA_TO_DEVICE); + } + + dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE; + if (urb->transfer_buffer_length != 0 + && !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP)) { + if (hcd->self.uses_dma) dma_unmap_single(hcd->self.controller, urb->transfer_dma, urb->transfer_buffer_length, - usb_urb_dir_in(urb) - ? DMA_FROM_DEVICE - : DMA_TO_DEVICE); + dir); + else if (hcd->driver->flags & HCD_LOCAL_MEM) + hcd_free_coherent(urb->dev->bus, &urb->transfer_dma, + &urb->transfer_buffer, + urb->transfer_buffer_length, + dir); } } @@ -1185,7 +1315,12 @@ int usb_hcd_submit_urb (struct urb *urb, gfp_t mem_flags) * URBs must be submitted in process context with interrupts * enabled. */ - map_urb_for_dma(hcd, urb); + status = map_urb_for_dma(hcd, urb, mem_flags); + if (unlikely(status)) { + usbmon_urb_submit_error(&hcd->self, urb, status); + goto error; + } + if (is_root_hub(urb->dev)) status = rh_urb_enqueue(hcd, urb); else @@ -1194,6 +1329,7 @@ int usb_hcd_submit_urb (struct urb *urb, gfp_t mem_flags) if (unlikely(status)) { usbmon_urb_submit_error(&hcd->self, urb, status); unmap_urb_for_dma(hcd, urb); + error: urb->hcpriv = NULL; INIT_LIST_HEAD(&urb->urb_list); atomic_dec(&urb->use_count); @@ -1291,7 +1427,7 @@ void usb_hcd_giveback_urb(struct usb_hcd *hcd, struct urb *urb, int status) wake_up (&usb_kill_urb_queue); usb_put_urb (urb); } -EXPORT_SYMBOL (usb_hcd_giveback_urb); +EXPORT_SYMBOL_GPL(usb_hcd_giveback_urb); /*-------------------------------------------------------------------------*/ @@ -1531,7 +1667,7 @@ int usb_bus_start_enum(struct usb_bus *bus, unsigned port_num) mod_timer(&hcd->rh_timer, jiffies + msecs_to_jiffies(10)); return status; } -EXPORT_SYMBOL (usb_bus_start_enum); +EXPORT_SYMBOL_GPL(usb_bus_start_enum); #endif @@ -1638,7 +1774,7 @@ struct usb_hcd *usb_create_hcd (const struct hc_driver *driver, "USB Host Controller"; return hcd; } -EXPORT_SYMBOL (usb_create_hcd); +EXPORT_SYMBOL_GPL(usb_create_hcd); static void hcd_release (struct kref *kref) { @@ -1653,14 +1789,14 @@ struct usb_hcd *usb_get_hcd (struct usb_hcd *hcd) kref_get (&hcd->kref); return hcd; } -EXPORT_SYMBOL (usb_get_hcd); +EXPORT_SYMBOL_GPL(usb_get_hcd); void usb_put_hcd (struct usb_hcd *hcd) { if (hcd) kref_put (&hcd->kref, hcd_release); } -EXPORT_SYMBOL (usb_put_hcd); +EXPORT_SYMBOL_GPL(usb_put_hcd); /** * usb_add_hcd - finish generic HCD structure initialization and register @@ -1786,7 +1922,7 @@ err_register_bus: hcd_buffer_destroy(hcd); return retval; } -EXPORT_SYMBOL (usb_add_hcd); +EXPORT_SYMBOL_GPL(usb_add_hcd); /** * usb_remove_hcd - shutdown processing for generic HCDs @@ -1828,7 +1964,7 @@ void usb_remove_hcd(struct usb_hcd *hcd) usb_deregister_bus(&hcd->self); hcd_buffer_destroy(hcd); } -EXPORT_SYMBOL (usb_remove_hcd); +EXPORT_SYMBOL_GPL(usb_remove_hcd); void usb_hcd_platform_shutdown(struct platform_device* dev) @@ -1838,7 +1974,7 @@ usb_hcd_platform_shutdown(struct platform_device* dev) if (hcd->driver->shutdown) hcd->driver->shutdown(hcd); } -EXPORT_SYMBOL (usb_hcd_platform_shutdown); +EXPORT_SYMBOL_GPL(usb_hcd_platform_shutdown); /*-------------------------------------------------------------------------*/ |