From: Arnaud Mandy <ext-arnaud.2.mandy@xxxxxxxxx>
rewriting of dma code for musb_g_rx function.
Signed-off-by: Arnaud Mandy <ext-arnaud.2.mandy@xxxxxxxxx>
Signed-off-by: Felipe Balbi <felipe.balbi@xxxxxxxxx>
---
drivers/usb/musb/musb_core.c | 7 ++-
drivers/usb/musb/musb_core.h | 2 +-
drivers/usb/musb/musb_gadget.c | 91 ++++++++++++++++++++++++++++++++++------
drivers/usb/musb/musb_gadget.h | 2 +-
4 files changed, 84 insertions(+), 18 deletions(-)
diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
index 7ec5f9e..632e8ac 100644
--- a/drivers/usb/musb/musb_core.c
+++ b/drivers/usb/musb/musb_core.c
@@ -1537,7 +1537,7 @@ irqreturn_t musb_interrupt(struct musb *musb)
musb_host_rx(musb, ep_num);
} else {
if (is_peripheral_capable())
- musb_g_rx(musb, ep_num);
+ musb_g_rx(musb, ep_num, false);
}
}
@@ -1608,7 +1608,7 @@ void musb_dma_completion(struct musb *musb, u8 epnum, u8 transmit)
musb_host_rx(musb, epnum);
} else {
if (is_peripheral_capable())
- musb_g_rx(musb, epnum);
+ musb_g_rx(musb, epnum, true);
}
}
}
@@ -1908,6 +1908,7 @@ bad_config:
musb->board_mode = plat->mode;
musb->board_set_power = plat->set_power;
musb->min_power = plat->min_power;
+ musb->use_dma = use_dma;
/* Clock usage is chip-specific ... functional clock (DaVinci,
* OMAP2430), or PHY ref (some TUSB6010 boards). All this core
@@ -1957,7 +1958,7 @@ bad_config:
}
#endif
/* ideally this would be abstracted in platform setup */
- if (!is_dma_capable() || !musb->dma_controller)
+ if (!musb->use_dma || !musb->dma_controller)
dev->dma_mask = NULL;
/* be sure interrupts are disabled before connecting ISR */
diff --git a/drivers/usb/musb/musb_core.h b/drivers/usb/musb/musb_core.h
index cdef6e7..644fcd8 100644
--- a/drivers/usb/musb/musb_core.h
+++ b/drivers/usb/musb/musb_core.h
@@ -116,7 +116,7 @@ struct musb_ep;
extern irqreturn_t musb_g_ep0_irq(struct musb *);
extern void musb_g_tx(struct musb *, u8);
-extern void musb_g_rx(struct musb *, u8);
+extern void musb_g_rx(struct musb *, u8, bool);
extern void musb_g_reset(struct musb *);
extern void musb_g_suspend(struct musb *);
extern void musb_g_resume(struct musb *);
diff --git a/drivers/usb/musb/musb_gadget.c b/drivers/usb/musb/musb_gadget.c
index 240e16e..cbfb25e 100644
--- a/drivers/usb/musb/musb_gadget.c
+++ b/drivers/usb/musb/musb_gadget.c
@@ -586,27 +586,52 @@ static void do_pio_rx(struct musb *musb, struct musb_request *req)
/*
* Data ready for a request; called from IRQ
*/
-void musb_g_rx(struct musb *musb, u8 epnum)
+void musb_g_rx(struct musb *musb, u8 epnum, bool is_dma)
{
u16 csr;
+ struct musb_request *req;
struct usb_request *request;
void __iomem *mbase = musb->mregs;
struct musb_ep *musb_ep = &musb->endpoints[epnum].ep_out;
void __iomem *epio = musb->endpoints[epnum].regs;
+ struct dma_channel *dma;
musb_ep_select(mbase, epnum);
+ csr = musb_readw(epio, MUSB_RXCSR);
+
+restart:
+
+ if (csr == 0) {
+ DBG(3, "spurious IRQ\n");
+ return;
+ }
+
request = next_request(musb_ep);
- csr = musb_readw(epio, MUSB_RXCSR);
+ if (!request) {
+ DBG(1, "waiting for request for %s (csr %04x)\n",
+ musb_ep->name, csr);
+ musb_ep->rx_pending = true;
+ return;
+ }
- DBG(4, "<== %s, rxcsr %04x %p\n", musb_ep->end_point.name,
- csr, request);
+ dma = musb_ep->dma;
+ DBG(4, "<== %s, rxcsr %04x %p (dma %s, %s)\n", musb_ep->name,
+ csr, request, dma ? "enabled" : "disabled",
+ is_dma ? "true" : "false");
if (csr & MUSB_RXCSR_P_SENTSTALL) {
+ DBG(5, "ep%d is halted, cannot transfer\n", epnum);
csr |= MUSB_RXCSR_P_WZC_BITS;
csr &= ~MUSB_RXCSR_P_SENTSTALL;
musb_writew(epio, MUSB_RXCSR, csr);
+ if (dma != NULL &&
+ dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
+ dma->status = MUSB_DMA_STATUS_CORE_ABORT;
+ musb->dma_controller->channel_abort(dma);
+ }
+
return;
}
@@ -623,15 +648,55 @@ void musb_g_rx(struct musb *musb, u8 epnum)
/* REVISIT not necessarily an error */
DBG(4, "%s, incomprx\n", musb_ep->end_point.name);
}
+ req = to_musb_request(request);
- /* analyze request if the ep is hot */
- if (request) {
- do_pio_rx(musb, to_musb_request(request));
- } else {
- DBG(3, "packet waiting for %s%s request\n",
- musb_ep->desc ? "" : "inactive ",
- musb_ep->end_point.name);
- musb_ep->rx_pending = true;
+ BUG_ON(dma == NULL && (csr & MUSB_RXCSR_DMAENAB));
+
+ if (dma != NULL) {
+ u32 len;
+
+ /* We do handle stalls yet. */
+ BUG_ON(csr & MUSB_RXCSR_P_SENDSTALL);
+
+ /* We abort() so dma->actual_len gets updated */
+ musb->dma_controller->channel_abort(dma);
+
+ /* We only expect full packets. */
+ BUG_ON(dma->actual_len & (musb_ep->packet_sz - 1));
+
+ request->actual += dma->actual_len;
+ len = dma->actual_len;
+
+ stop_dma(musb, musb_ep, req);
+ dma = NULL;
+
+ DBG(4, "RXCSR%d %04x, dma off, %04x, len %zu, req %p\n",
+ epnum, csr, musb_readw(epio, MUSB_RXCSR),
+ len, request);
+
+ if (!is_dma) {
+ /* Unload with pio */
+ do_pio_rx(musb, req);
+ } else {
+ BUG_ON(request->actual != request->length);
+ musb_g_giveback(musb_ep, request, 0);
+ }
+ return;
+ }
+
+ if (dma == NULL && musb->use_dma) {
+ if (start_dma(musb, req) == 0)
+ dma = musb_ep->dma;
+ }
+
+ if (dma == NULL) {
+ do_pio_rx(musb, req);
+ csr = musb_readw(epio, MUSB_RXCSR);
+ if (csr & MUSB_RXCSR_RXPKTRDY) {
+ DBG(2, "new packet in FIFO, restarting RX "
+ "(CSR %04x)\n", csr);
+ goto restart;
+ }
}
}
@@ -934,7 +999,7 @@ static int musb_gadget_queue(struct usb_ep *ep, struct usb_request *req,
if (!request->tx && musb_ep->rx_pending) {
DBG(1, "processing pending RX\n");
musb_ep->rx_pending = false;
- musb_g_rx(musb, musb_ep->current_epnum);
+ musb_g_rx(musb, musb_ep->current_epnum, false);
}
cleanup:
diff --git a/drivers/usb/musb/musb_gadget.h b/drivers/usb/musb/musb_gadget.h
index 3a0899b..f602df8 100644
--- a/drivers/usb/musb/musb_gadget.h
+++ b/drivers/usb/musb/musb_gadget.h
@@ -100,7 +100,7 @@ static inline struct usb_request *next_request(struct musb_ep *ep)
}
extern void musb_g_tx(struct musb *musb, u8 epnum);
-extern void musb_g_rx(struct musb *musb, u8 epnum);
+extern void musb_g_rx(struct musb *musb, u8 epnum, bool is_dma);
extern const struct usb_ep_ops musb_g_ep0_ops;
--
1.6.6.rc0
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