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path: root/drivers/usb/dwc2/hcd.c
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Diffstat (limited to 'drivers/usb/dwc2/hcd.c')
-rw-r--r--drivers/usb/dwc2/hcd.c147
1 files changed, 118 insertions, 29 deletions
diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c
index edaf0b6af4f0..6e2cdd7b93d4 100644
--- a/drivers/usb/dwc2/hcd.c
+++ b/drivers/usb/dwc2/hcd.c
@@ -1567,11 +1567,20 @@ static void dwc2_hc_start_transfer(struct dwc2_hsotg *hsotg,
}
if (hsotg->params.host_dma) {
- dwc2_writel((u32)chan->xfer_dma,
- hsotg->regs + HCDMA(chan->hc_num));
+ dma_addr_t dma_addr;
+
+ if (chan->align_buf) {
+ if (dbg_hc(chan))
+ dev_vdbg(hsotg->dev, "align_buf\n");
+ dma_addr = chan->align_buf;
+ } else {
+ dma_addr = chan->xfer_dma;
+ }
+ dwc2_writel((u32)dma_addr, hsotg->regs + HCDMA(chan->hc_num));
+
if (dbg_hc(chan))
dev_vdbg(hsotg->dev, "Wrote %08lx to HCDMA(%d)\n",
- (unsigned long)chan->xfer_dma, chan->hc_num);
+ (unsigned long)dma_addr, chan->hc_num);
}
/* Start the split */
@@ -2625,36 +2634,66 @@ static void dwc2_hc_init_xfer(struct dwc2_hsotg *hsotg,
}
}
-#define DWC2_USB_DMA_ALIGN 4
+static int dwc2_alloc_split_dma_aligned_buf(struct dwc2_hsotg *hsotg,
+ struct dwc2_qh *qh,
+ struct dwc2_host_chan *chan)
+{
+ if (!hsotg->unaligned_cache ||
+ chan->max_packet > DWC2_KMEM_UNALIGNED_BUF_SIZE)
+ return -ENOMEM;
-struct dma_aligned_buffer {
- void *kmalloc_ptr;
- void *old_xfer_buffer;
- u8 data[0];
-};
+ if (!qh->dw_align_buf) {
+ qh->dw_align_buf = kmem_cache_alloc(hsotg->unaligned_cache,
+ GFP_ATOMIC | GFP_DMA);
+ if (!qh->dw_align_buf)
+ return -ENOMEM;
+ }
+
+ qh->dw_align_buf_dma = dma_map_single(hsotg->dev, qh->dw_align_buf,
+ DWC2_KMEM_UNALIGNED_BUF_SIZE,
+ DMA_FROM_DEVICE);
+
+ if (dma_mapping_error(hsotg->dev, qh->dw_align_buf_dma)) {
+ dev_err(hsotg->dev, "can't map align_buf\n");
+ chan->align_buf = 0;
+ return -EINVAL;
+ }
+
+ chan->align_buf = qh->dw_align_buf_dma;
+ return 0;
+}
+
+#define DWC2_USB_DMA_ALIGN 4
static void dwc2_free_dma_aligned_buffer(struct urb *urb)
{
- struct dma_aligned_buffer *temp;
+ void *stored_xfer_buffer;
+ size_t length;
if (!(urb->transfer_flags & URB_ALIGNED_TEMP_BUFFER))
return;
- temp = container_of(urb->transfer_buffer,
- struct dma_aligned_buffer, data);
+ /* Restore urb->transfer_buffer from the end of the allocated area */
+ memcpy(&stored_xfer_buffer, urb->transfer_buffer +
+ urb->transfer_buffer_length, sizeof(urb->transfer_buffer));
- if (usb_urb_dir_in(urb))
- memcpy(temp->old_xfer_buffer, temp->data,
- urb->transfer_buffer_length);
- urb->transfer_buffer = temp->old_xfer_buffer;
- kfree(temp->kmalloc_ptr);
+ if (usb_urb_dir_in(urb)) {
+ if (usb_pipeisoc(urb->pipe))
+ length = urb->transfer_buffer_length;
+ else
+ length = urb->actual_length;
+
+ memcpy(stored_xfer_buffer, urb->transfer_buffer, length);
+ }
+ kfree(urb->transfer_buffer);
+ urb->transfer_buffer = stored_xfer_buffer;
urb->transfer_flags &= ~URB_ALIGNED_TEMP_BUFFER;
}
static int dwc2_alloc_dma_aligned_buffer(struct urb *urb, gfp_t mem_flags)
{
- struct dma_aligned_buffer *temp, *kmalloc_ptr;
+ void *kmalloc_ptr;
size_t kmalloc_size;
if (urb->num_sgs || urb->sg ||
@@ -2662,22 +2701,29 @@ static int dwc2_alloc_dma_aligned_buffer(struct urb *urb, gfp_t mem_flags)
!((uintptr_t)urb->transfer_buffer & (DWC2_USB_DMA_ALIGN - 1)))
return 0;
- /* Allocate a buffer with enough padding for alignment */
+ /*
+ * Allocate a buffer with enough padding for original transfer_buffer
+ * pointer. This allocation is guaranteed to be aligned properly for
+ * DMA
+ */
kmalloc_size = urb->transfer_buffer_length +
- sizeof(struct dma_aligned_buffer) + DWC2_USB_DMA_ALIGN - 1;
+ sizeof(urb->transfer_buffer);
kmalloc_ptr = kmalloc(kmalloc_size, mem_flags);
if (!kmalloc_ptr)
return -ENOMEM;
- /* Position our struct dma_aligned_buffer such that data is aligned */
- temp = PTR_ALIGN(kmalloc_ptr + 1, DWC2_USB_DMA_ALIGN) - 1;
- temp->kmalloc_ptr = kmalloc_ptr;
- temp->old_xfer_buffer = urb->transfer_buffer;
+ /*
+ * Position value of original urb->transfer_buffer pointer to the end
+ * of allocation for later referencing
+ */
+ memcpy(kmalloc_ptr + urb->transfer_buffer_length,
+ &urb->transfer_buffer, sizeof(urb->transfer_buffer));
+
if (usb_urb_dir_out(urb))
- memcpy(temp->data, urb->transfer_buffer,
+ memcpy(kmalloc_ptr, urb->transfer_buffer,
urb->transfer_buffer_length);
- urb->transfer_buffer = temp->data;
+ urb->transfer_buffer = kmalloc_ptr;
urb->transfer_flags |= URB_ALIGNED_TEMP_BUFFER;
@@ -2802,6 +2848,32 @@ static int dwc2_assign_and_init_hc(struct dwc2_hsotg *hsotg, struct dwc2_qh *qh)
/* Set the transfer attributes */
dwc2_hc_init_xfer(hsotg, chan, qtd);
+ /* For non-dword aligned buffers */
+ if (hsotg->params.host_dma && qh->do_split &&
+ chan->ep_is_in && (chan->xfer_dma & 0x3)) {
+ dev_vdbg(hsotg->dev, "Non-aligned buffer\n");
+ if (dwc2_alloc_split_dma_aligned_buf(hsotg, qh, chan)) {
+ dev_err(hsotg->dev,
+ "Failed to allocate memory to handle non-aligned buffer\n");
+ /* Add channel back to free list */
+ chan->align_buf = 0;
+ chan->multi_count = 0;
+ list_add_tail(&chan->hc_list_entry,
+ &hsotg->free_hc_list);
+ qtd->in_process = 0;
+ qh->channel = NULL;
+ return -ENOMEM;
+ }
+ } else {
+ /*
+ * We assume that DMA is always aligned in non-split
+ * case or split out case. Warn if not.
+ */
+ WARN_ON_ONCE(hsotg->params.host_dma &&
+ (chan->xfer_dma & 0x3));
+ chan->align_buf = 0;
+ }
+
if (chan->ep_type == USB_ENDPOINT_XFER_INT ||
chan->ep_type == USB_ENDPOINT_XFER_ISOC)
/*
@@ -5246,6 +5318,19 @@ int dwc2_hcd_init(struct dwc2_hsotg *hsotg)
}
}
+ if (hsotg->params.host_dma) {
+ /*
+ * Create kmem caches to handle non-aligned buffer
+ * in Buffer DMA mode.
+ */
+ hsotg->unaligned_cache = kmem_cache_create("dwc2-unaligned-dma",
+ DWC2_KMEM_UNALIGNED_BUF_SIZE, 4,
+ SLAB_CACHE_DMA, NULL);
+ if (!hsotg->unaligned_cache)
+ dev_err(hsotg->dev,
+ "unable to create dwc2 unaligned cache\n");
+ }
+
hsotg->otg_port = 1;
hsotg->frame_list = NULL;
hsotg->frame_list_dma = 0;
@@ -5280,8 +5365,9 @@ int dwc2_hcd_init(struct dwc2_hsotg *hsotg)
return 0;
error4:
- kmem_cache_destroy(hsotg->desc_gen_cache);
+ kmem_cache_destroy(hsotg->unaligned_cache);
kmem_cache_destroy(hsotg->desc_hsisoc_cache);
+ kmem_cache_destroy(hsotg->desc_gen_cache);
error3:
dwc2_hcd_release(hsotg);
error2:
@@ -5322,8 +5408,9 @@ void dwc2_hcd_remove(struct dwc2_hsotg *hsotg)
usb_remove_hcd(hcd);
hsotg->priv = NULL;
- kmem_cache_destroy(hsotg->desc_gen_cache);
+ kmem_cache_destroy(hsotg->unaligned_cache);
kmem_cache_destroy(hsotg->desc_hsisoc_cache);
+ kmem_cache_destroy(hsotg->desc_gen_cache);
dwc2_hcd_release(hsotg);
usb_put_hcd(hcd);
@@ -5435,7 +5522,7 @@ int dwc2_host_enter_hibernation(struct dwc2_hsotg *hsotg)
dwc2_writel(hprt0, hsotg->regs + HPRT0);
/* Wait for the HPRT0.PrtSusp register field to be set */
- if (dwc2_hsotg_wait_bit_set(hsotg, HPRT0, HPRT0_SUSP, 300))
+ if (dwc2_hsotg_wait_bit_set(hsotg, HPRT0, HPRT0_SUSP, 3000))
dev_warn(hsotg->dev, "Suspend wasn't generated\n");
/*
@@ -5616,6 +5703,8 @@ int dwc2_host_exit_hibernation(struct dwc2_hsotg *hsotg, int rem_wakeup,
return ret;
}
+ dwc2_hcd_rem_wakeup(hsotg);
+
hsotg->hibernated = 0;
hsotg->bus_suspended = 0;
hsotg->lx_state = DWC2_L0;