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path: root/drivers/usb/gadget/omap_udc.c
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Diffstat (limited to 'drivers/usb/gadget/omap_udc.c')
-rw-r--r--drivers/usb/gadget/omap_udc.c103
1 files changed, 93 insertions, 10 deletions
diff --git a/drivers/usb/gadget/omap_udc.c b/drivers/usb/gadget/omap_udc.c
index 8f9a2b6..b394e63 100644
--- a/drivers/usb/gadget/omap_udc.c
+++ b/drivers/usb/gadget/omap_udc.c
@@ -296,6 +296,15 @@ omap_free_request(struct usb_ep *ep, struct usb_request *_req)
/*-------------------------------------------------------------------------*/
+/*
+ * dma-coherent memory allocation (for dma-capable endpoints)
+ *
+ * NOTE: the dma_*_coherent() API calls suck. Most implementations are
+ * (a) page-oriented, so small buffers lose big; and (b) asymmetric with
+ * respect to calls with irqs disabled: alloc is safe, free is not.
+ * We currently work around (b), but not (a).
+ */
+
static void *
omap_alloc_buffer(
struct usb_ep *_ep,
@@ -307,6 +316,9 @@ omap_alloc_buffer(
void *retval;
struct omap_ep *ep;
+ if (!_ep)
+ return NULL;
+
ep = container_of(_ep, struct omap_ep, ep);
if (use_dma && ep->has_dma) {
static int warned;
@@ -326,6 +338,35 @@ omap_alloc_buffer(
return retval;
}
+static DEFINE_SPINLOCK(buflock);
+static LIST_HEAD(buffers);
+
+struct free_record {
+ struct list_head list;
+ struct device *dev;
+ unsigned bytes;
+ dma_addr_t dma;
+};
+
+static void do_free(unsigned long ignored)
+{
+ spin_lock_irq(&buflock);
+ while (!list_empty(&buffers)) {
+ struct free_record *buf;
+
+ buf = list_entry(buffers.next, struct free_record, list);
+ list_del(&buf->list);
+ spin_unlock_irq(&buflock);
+
+ dma_free_coherent(buf->dev, buf->bytes, buf, buf->dma);
+
+ spin_lock_irq(&buflock);
+ }
+ spin_unlock_irq(&buflock);
+}
+
+static DECLARE_TASKLET(deferred_free, do_free, 0);
+
static void omap_free_buffer(
struct usb_ep *_ep,
void *buf,
@@ -333,13 +374,29 @@ static void omap_free_buffer(
unsigned bytes
)
{
- struct omap_ep *ep;
+ if (!_ep) {
+ WARN_ON(1);
+ return;
+ }
- ep = container_of(_ep, struct omap_ep, ep);
- if (use_dma && _ep && ep->has_dma)
- dma_free_coherent(ep->udc->gadget.dev.parent, bytes, buf, dma);
- else
- kfree (buf);
+ /* free memory into the right allocator */
+ if (dma != DMA_ADDR_INVALID) {
+ struct omap_ep *ep;
+ struct free_record *rec = buf;
+ unsigned long flags;
+
+ ep = container_of(_ep, struct omap_ep, ep);
+
+ rec->dev = ep->udc->gadget.dev.parent;
+ rec->bytes = bytes;
+ rec->dma = dma;
+
+ spin_lock_irqsave(&buflock, flags);
+ list_add_tail(&rec->list, &buffers);
+ tasklet_schedule(&deferred_free);
+ spin_unlock_irqrestore(&buflock, flags);
+ } else
+ kfree(buf);
}
/*-------------------------------------------------------------------------*/
@@ -1691,12 +1748,38 @@ ep0out_status_stage:
udc->ep0_pending = 0;
break;
case USB_REQ_GET_STATUS:
+ /* USB_ENDPOINT_HALT status? */
+ if (u.r.bRequestType != (USB_DIR_IN|USB_RECIP_ENDPOINT))
+ goto intf_status;
+
+ /* ep0 never stalls */
+ if (!(w_index & 0xf))
+ goto zero_status;
+
+ /* only active endpoints count */
+ ep = &udc->ep[w_index & 0xf];
+ if (w_index & USB_DIR_IN)
+ ep += 16;
+ if (!ep->desc)
+ goto do_stall;
+
+ /* iso never stalls */
+ if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC)
+ goto zero_status;
+
+ /* FIXME don't assume non-halted endpoints!! */
+ ERR("%s status, can't report\n", ep->ep.name);
+ goto do_stall;
+
+intf_status:
/* return interface status. if we were pedantic,
* we'd detect non-existent interfaces, and stall.
*/
if (u.r.bRequestType
!= (USB_DIR_IN|USB_RECIP_INTERFACE))
goto delegate;
+
+zero_status:
/* return two zero bytes */
UDC_EP_NUM_REG = UDC_EP_SEL|UDC_EP_DIR;
UDC_DATA_REG = 0;
@@ -2068,7 +2151,7 @@ static irqreturn_t omap_udc_iso_irq(int irq, void *_dev)
/*-------------------------------------------------------------------------*/
-static inline int machine_needs_vbus_session(void)
+static inline int machine_without_vbus_sense(void)
{
return (machine_is_omap_innovator()
|| machine_is_omap_osk()
@@ -2156,7 +2239,7 @@ int usb_gadget_register_driver (struct usb_gadget_driver *driver)
/* boards that don't have VBUS sensing can't autogate 48MHz;
* can't enter deep sleep while a gadget driver is active.
*/
- if (machine_needs_vbus_session())
+ if (machine_without_vbus_sense())
omap_vbus_session(&udc->gadget, 1);
done:
@@ -2179,7 +2262,7 @@ int usb_gadget_unregister_driver (struct usb_gadget_driver *driver)
if (udc->dc_clk != NULL)
omap_udc_enable_clock(1);
- if (machine_needs_vbus_session())
+ if (machine_without_vbus_sense())
omap_vbus_session(&udc->gadget, 0);
if (udc->transceiver)
@@ -2822,7 +2905,7 @@ static int __init omap_udc_probe(struct platform_device *pdev)
hmc = HMC_1510;
type = "(unknown)";
- if (machine_is_omap_innovator() || machine_is_sx1()) {
+ if (machine_without_vbus_sense()) {
/* just set up software VBUS detect, and then
* later rig it so we always report VBUS.
* FIXME without really sensing VBUS, we can't
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