diff options
| -rw-r--r-- | drivers/usb/musb/musb_host.c | 98 | ||||
| -rw-r--r-- | drivers/usb/musb/musb_host.h | 3 |
2 files changed, 96 insertions, 5 deletions
diff --git a/drivers/usb/musb/musb_host.c b/drivers/usb/musb/musb_host.c index 2f6f9a89802e..d385e8a8187d 100644 --- a/drivers/usb/musb/musb_host.c +++ b/drivers/usb/musb/musb_host.c @@ -823,9 +823,28 @@ static void musb_ep_program(struct musb *musb, u8 epnum, if (load_count) { /* PIO to load FIFO */ qh->segsize = load_count; - musb_write_fifo(hw_ep, load_count, buf); + if (!buf) { + sg_miter_start(&qh->sg_miter, urb->sg, 1, + SG_MITER_ATOMIC + | SG_MITER_FROM_SG); + if (!sg_miter_next(&qh->sg_miter)) { + dev_err(musb->controller, + "error: sg" + "list empty\n"); + sg_miter_stop(&qh->sg_miter); + goto finish; + } + buf = qh->sg_miter.addr + urb->sg->offset + + urb->actual_length; + load_count = min_t(u32, load_count, + qh->sg_miter.length); + musb_write_fifo(hw_ep, load_count, buf); + qh->sg_miter.consumed = load_count; + sg_miter_stop(&qh->sg_miter); + } else + musb_write_fifo(hw_ep, load_count, buf); } - +finish: /* re-enable interrupt */ musb_writew(mbase, MUSB_INTRTXE, int_txe); @@ -1193,6 +1212,7 @@ void musb_host_tx(struct musb *musb, u8 epnum) void __iomem *mbase = musb->mregs; struct dma_channel *dma; bool transfer_pending = false; + static bool use_sg; musb_ep_select(mbase, epnum); tx_csr = musb_readw(epio, MUSB_TXCSR); @@ -1247,6 +1267,7 @@ void musb_host_tx(struct musb *musb, u8 epnum) return; } +done: if (status) { if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) { dma->status = MUSB_DMA_STATUS_CORE_ABORT; @@ -1416,9 +1437,38 @@ void musb_host_tx(struct musb *musb, u8 epnum) length = qh->maxpacket; /* Unmap the buffer so that CPU can use it */ usb_hcd_unmap_urb_for_dma(musb_to_hcd(musb), urb); - musb_write_fifo(hw_ep, length, urb->transfer_buffer + offset); + + /* + * We need to map sg if the transfer_buffer is + * NULL. + */ + if (!urb->transfer_buffer) + use_sg = true; + + if (use_sg) { + /* sg_miter_start is already done in musb_ep_program */ + if (!sg_miter_next(&qh->sg_miter)) { + dev_err(musb->controller, "error: sg list empty\n"); + sg_miter_stop(&qh->sg_miter); + status = -EINVAL; + goto done; + } + urb->transfer_buffer = qh->sg_miter.addr; + length = min_t(u32, length, qh->sg_miter.length); + musb_write_fifo(hw_ep, length, urb->transfer_buffer); + qh->sg_miter.consumed = length; + sg_miter_stop(&qh->sg_miter); + } else { + musb_write_fifo(hw_ep, length, urb->transfer_buffer + offset); + } + qh->segsize = length; + if (use_sg) { + if (offset + length >= urb->transfer_buffer_length) + use_sg = false; + } + musb_ep_select(mbase, epnum); musb_writew(epio, MUSB_TXCSR, MUSB_TXCSR_H_WZC_BITS | MUSB_TXCSR_TXPKTRDY); @@ -1482,6 +1532,8 @@ void musb_host_rx(struct musb *musb, u8 epnum) bool done = false; u32 status; struct dma_channel *dma; + static bool use_sg; + unsigned int sg_flags = SG_MITER_ATOMIC | SG_MITER_TO_SG; musb_ep_select(mbase, epnum); @@ -1796,10 +1848,43 @@ void musb_host_rx(struct musb *musb, u8 epnum) #endif /* Mentor DMA */ if (!dma) { + unsigned int received_len; + /* Unmap the buffer so that CPU can use it */ usb_hcd_unmap_urb_for_dma(musb_to_hcd(musb), urb); - done = musb_host_packet_rx(musb, urb, - epnum, iso_err); + + /* + * We need to map sg if the transfer_buffer is + * NULL. + */ + if (!urb->transfer_buffer) { + use_sg = true; + sg_miter_start(&qh->sg_miter, urb->sg, 1, + sg_flags); + } + + if (use_sg) { + if (!sg_miter_next(&qh->sg_miter)) { + dev_err(musb->controller, "error: sg list empty\n"); + sg_miter_stop(&qh->sg_miter); + status = -EINVAL; + done = true; + goto finish; + } + urb->transfer_buffer = qh->sg_miter.addr; + received_len = urb->actual_length; + qh->offset = 0x0; + done = musb_host_packet_rx(musb, urb, epnum, + iso_err); + /* Calculate the number of bytes received */ + received_len = urb->actual_length - + received_len; + qh->sg_miter.consumed = received_len; + sg_miter_stop(&qh->sg_miter); + } else { + done = musb_host_packet_rx(musb, urb, + epnum, iso_err); + } dev_dbg(musb->controller, "read %spacket\n", done ? "last " : ""); } } @@ -1808,6 +1893,9 @@ finish: urb->actual_length += xfer_len; qh->offset += xfer_len; if (done) { + if (use_sg) + use_sg = false; + if (urb->status == -EINPROGRESS) urb->status = status; musb_advance_schedule(musb, urb, hw_ep, USB_DIR_IN); diff --git a/drivers/usb/musb/musb_host.h b/drivers/usb/musb/musb_host.h index 622d09fb9aba..5a9c8feec10c 100644 --- a/drivers/usb/musb/musb_host.h +++ b/drivers/usb/musb/musb_host.h @@ -35,6 +35,8 @@ #ifndef _MUSB_HOST_H #define _MUSB_HOST_H +#include <linux/scatterlist.h> + static inline struct usb_hcd *musb_to_hcd(struct musb *musb) { return container_of((void *) musb, struct usb_hcd, hcd_priv); @@ -71,6 +73,7 @@ struct musb_qh { u16 maxpacket; u16 frame; /* for periodic schedule */ unsigned iso_idx; /* in urb->iso_frame_desc[] */ + struct sg_mapping_iter sg_miter; /* for highmem in PIO mode */ }; /* map from control or bulk queue head to the first qh on that ring */ |