This driver for Freescale MPC512x LocalPlus Bus FIFO (called SCLPC
in the Reference Manual) allows Direct Memory Access transfers
between RAM and peripheral devices on LocalPlus Bus.
Changes in v3:
- resource usage in probe() is fixed;
- driver methods are made safe against remove();
- dma_request_slave_channel() is used to get DMA channel number from
the device tree;
- chip select number concerned with the DMA transaction is determined
from 'localbus' device tree node information;
- register set is described as a structure;
- symbolic names are given to shift counts to keep magic numbers
out of the code;
- choosing values for LPBFIFO BPT (bytes per transfer) and DMA maxburst
is improved, so DMA transfer size has increased for some cases;
- device tree binding for LPBFIFO is documented;
- Kconfig and Makefile are improved;
- email address "a13xp0p0v88@xxxxxxxxx" is changed to a more pleasant
alias "alex.popov@xxxxxxxxx".
Changes in v4:
- the race condition is fixed;
- plenty of style fixes are made;
- devm_* functions and EPROBE_DEFER are used in probe().
Alexander Popov (2):
powerpc/512x: add LocalPlus Bus FIFO device driver
powerpc/512x: add a device tree binding for LocalPlus Bus FIFO
.../bindings/powerpc/fsl/mpc512x_lpbfifo.txt | 21 +
arch/powerpc/boot/dts/mpc5121.dtsi | 11 +-
arch/powerpc/boot/dts/mpc5125twr.dts | 11 +-
arch/powerpc/configs/mpc512x_defconfig | 1 +
arch/powerpc/include/asm/mpc5121.h | 59 +++
arch/powerpc/platforms/512x/Kconfig | 6 +
arch/powerpc/platforms/512x/Makefile | 1 +
arch/powerpc/platforms/512x/mpc512x_lpbfifo.c | 539 +++++++++++++++++++++
8 files changed, 646 insertions(+), 3 deletions(-)
create mode 100644 Documentation/devicetree/bindings/powerpc/fsl/mpc512x_lpbfifo.txt
create mode 100644 arch/powerpc/platforms/512x/mpc512x_lpbfifo.c
--
1.9.1
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