usb: sm501 ohci controller patches V4/V2
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- v1 Latest2 patches 5 repliesIn review
Patches in v1 No applies recorded yet
| # | Subject and files | Size | Replies | Applied |
|---|---|---|---|---|
| 1/2 | usb: dma bounce buffer support V4drivers/ drivers/ drivers/ | +163 | 0 replies | |
| 2/2 | usb: ohci-sm501 driver V2drivers/ drivers/ | +269 | 5 replies |
Reviews trailers per patch
1 of 2 patches has a Reviewed-by or Acked-by.
| Patch | Alan Stern | David Brownell |
|---|---|---|
| 1/2 | A-b | A-b |
| 2/2 |
Trailers given in replies are filled; those carried in the patches from earlier versions are outlined with dashes.
Cover letter [PATCH][0/2] usb: sm501 ohci controller patches V4/V2
usb: sm501 ohci controller patches V4/V2
[1/2] usb: dma bounce buffer support V4
[2/2] usb: ohci-sm501 driver V2
The sm501 usb host controller is a regular ohci implementation but with the exception that it can only do dma to a certain area of memory. This memory is sm501 specific and the mfd driver for sm501 currently divides this memory between the framebuffer and the usb host controller.
To support the sm501 usb host controller we need to allocate all usb data from this sm501 memory. The function dma_declare_coherent_memory() helps us with that - all dma_alloc_coherent() calls will end up allocating such memory.
The USB core does however allocate data using kmalloc, so to fully support such a behaviour we need dma bounce buffer support. These bounce buffers can be requested using the flag HCD_LOCAL_MEM.
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drivers/usb/core/buffer.c | 9 - drivers/usb/core/hcd.c | 176 ++++++++++++++++++++++++--- drivers/usb/core/hcd.h | 1 drivers/usb/host/ohci-hcd.c | 5 drivers/usb/host/ohci-sm501.c | 264 +++++++++++++++++++++++++++++++++++++++++ 5 files changed, 432 insertions(+), 23 deletions(-)