ENGR00217721-2 add dma_pool_alloc_nonbufferable interface

include/linux head file part

- After USB driver prime a bulk transfer(whatever IN or OUT, take
  OUT for example) on ep1, only one dTD is primed, an USB Interrupt
  (bit 0 of USBSTS) will be issued, and find that endptcomplete
  register is 0x2 which means an OUT transfer on ep1 is completed,
  at this time the ep1 out queue head status is 0x1e18000, and next
  dtd pointer is 0x1 which means transfer is done and everything is
  OK, while the dTD token status is 0x2008080 which means this dTD
  is still active, not completed yet.
- Audio SDMA and Ethernet have the similar issue
- root cause is not found yet
- work around:
  change the non-cacheable bufferable memory to non-cacheable
  non-bufferable memory to make this issue disappear.

Signed-off-by: Tony LIU <junjie.liu@freescale.com>

diff --git a/include/linux/dmapool.h b/include/linux/dmapool.h
index 022e34fcbd1bf6b56cb5f0dbb250a28885797f80..450950163272789a7b0079ff3661eae776d4cb15 100644 (file)
--- a/include/linux/dmapool.h
+++ b/include/linux/dmapool.h
@@ -22,6 +22,11 @@ void dma_pool_destroy(struct dma_pool *pool);
 void *dma_pool_alloc(struct dma_pool *pool, gfp_t mem_flags,
                     dma_addr_t *handle);
 
+#ifdef CONFIG_FSL_UTP
+void *dma_pool_alloc_nonbufferable(struct dma_pool *pool, gfp_t mem_flags,
+                    dma_addr_t *handle);
+#endif
+
 void dma_pool_free(struct dma_pool *pool, void *vaddr, dma_addr_t addr);
 
 /*