dmaengine: add support mmp-pdma

1. virtual channel vs. physical channel
Virtual channel is managed by dmaengine
Physical channel handling resource, such as irq
Physical channel is alloced dynamically as descending priority, freed immediately when irq done.
The availble highest priority physically channel will alwayes be alloced

Issue pending list -> alloc highest dma physically channel available -> dma done -> free physically channel

2. list: running list & pending list
submit: desc list -> pending list
issue_pending_list: if (IDLE) pending list -> running list; free pending list (RUN)
irq: free running list (IDLE)

     check pendlist -> pending list -> running list; free pending list (RUN)

3. irq:
Each list generate one irq, calling callback
One list may contain several desc chain, in such case, make sure only the last desc list generate irq.

4. async
Submit will add desc chain to pending list, which can be multi-called If multi desc chain is submitted, only the last desc would generate irq -> call back If IDLE, issue_pending_list start pending_list, transforming pendlist to running list If RUN, irq will start pending list

5. test
5.1 pxa3xx_nand on pxa910
5.2 insmod dmatest.ko (threads_per_chan=y)
By default drivers/dma/dmatest.c test every channel and test memcpy with 1 threads per channel

Signed-off-by Zhangfei Gao <[email protected]>

Acked-by Arnd Bergmann <[email protected]>

Signed-off-by Zhangfei Gao <[email protected]>

Acked-by Arnd Bergmann <[email protected]>

Signed-off-by Zhangfei Gao <[email protected]>

Acked-by Arnd Bergmann <[email protected]>

---
 Documentation/devicetree/bindings/dma/mmp-dma.txt |   75 +++++++++++++++++++++
 1 files changed, 75 insertions(+), 0 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/dma/mmp-dma.txt

Documentation/devicetree/bindings/dma/mmp-dma.txt new file +75 -0

new file mode 100644
index 0000000..36254c4
@@ -0,0 +1,75 @@
+* MARVELL MMP DMA controller
+
+Marvell Peripheral DMA Controller
+Used platfroms: pxa688, pxa910, pxa3xx, etc
+
+Required properties:
+- compatible: Should be "marvell,pdma-1.0"
+- reg: Should contain DMA registers location and length.
+- interrupts: Either contain all of the per-channel DMA interrupts
+		or one irq for pdma device
+- #dma-channels: Number of DMA channels supported by the controller.
+
+"marvell,pdma-1.0"
+Used platfroms: pxa25x, pxa27x, pxa3xx, pxa93x, pxa168, pxa910, pxa688.
+
+Examples:
+
+/*
+ * Each channel has specific irq
+ * ICU parse out irq channel from ICU register,
+ * while DMA controller may not able to distinguish the irq channel
+ * Using this method, interrupt-parent is required as demuxer
+ * For example, pxa688 icu register 0x128, bit 0~15 is PDMA channel irq,
+ * 18~21 is ADMA irq
+ */
+pdma: dma-controller at d4000000 {
+	      compatible = "marvell,pdma-1.0";
+	      reg = <0xd4000000 0x10000>;
+	      interrupts = <0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15>;
+	      interrupt-parent = <&intcmux32>;
+	      #dma-channels = <16>;
+      };
+
+/*
+ * One irq for all channels
+ * Dmaengine driver (DMA controller) distinguish irq channel via
+ * parsing internal register
+ */
+pdma: dma-controller at d4000000 {
+	      compatible = "marvell,pdma-1.0";
+	      reg = <0xd4000000 0x10000>;
+	      interrupts = <47>;
+	      #dma-channels = <16>;
+      };
+
+
+Marvell Two Channel DMA Controller used specifically for audio
+Used platfroms: pxa688, pxa910
+
+Required properties:
+- compatible: Should be "marvell,adma-1.0" or "marvell,pxa910-squ"
+- reg: Should contain DMA registers location and length.
+- interrupts: Either contain all of the per-channel DMA interrupts
+		or one irq for dma device
+
+"marvell,adma-1.0" used on pxa688
+"marvell,pxa910-squ" used on pxa910
+
+Examples:
+
+/* each channel has specific irq */
+adma0: dma-controller at d42a0800 {
+	      compatible = "marvell,adma-1.0";
+	      reg = <0xd42a0800 0x100>;
+	      interrupts = <18 19>;
+	      interrupt-parent = <&intcmux32>;
+      };
+
+/* One irq for all channels */
+squ: dma-controller at d42a0800 {
+	      compatible = "marvell,pxa910-squ";
+	      reg = <0xd42a0800 0x100>;
+	      interrupts = <46>;
+      };
+

Quoted 2 lines · Zhangfei Gao

Signed-off-by Zhangfei Gao <[email protected]>

Acked-by Arnd Bergmann <[email protected]>

Acked-by Vinod Koul <[email protected]>

I think this patch should be merged in tree having this file, possibly arm tree?

Quoted 5 lines

---
 Documentation/devicetree/bindings/dma/mmp-dma.txt |   75 +++++++++++++++++++++
 1 files changed, 75 insertions(+), 0 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/dma/mmp-dma.txt

Quoted 8 lines · Vinod Koul

Quoted 2 lines · Zhangfei Gao

Signed-off-by Zhangfei Gao <[email protected]>

Acked-by Arnd Bergmann <[email protected]>

Acked-by Vinod Koul <[email protected]>

I think this patch should be merged in tree having this file, possibly arm tree?

You can merge this patch into your tree since it only appends a new file.

Acked-by Haojian Zhuang <[email protected]>

Regards
Haojian

Quoted 5 lines

Quoted 5 lines

---
 Documentation/devicetree/bindings/dma/mmp-dma.txt |   75 +++++++++++++++++++++
 1 files changed, 75 insertions(+), 0 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/dma/mmp-dma.txt

Quoted 6 lines · Haojian Zhuang

Quoted 5 lines · Vinod Koul

Quoted 2 lines · Zhangfei Gao

Signed-off-by Zhangfei Gao <[email protected]>

Acked-by Arnd Bergmann <[email protected]>

Acked-by Vinod Koul <[email protected]>

Quoted 5 lines

Quoted 3 lines

I think this patch should be merged in tree having this file, possibly arm tree?

You can merge this patch into your tree since it only appends a new file.

And as I have said previously my tree or linus's tree doesn't have this file. SO this needs to go to a tree where thsi file exists

Quoted 6 lines

Acked-by Haojian Zhuang <[email protected]>

Quoted 4 lines

Quoted 4 lines

 Documentation/devicetree/bindings/dma/mmp-dma.txt |   75 +++++++++++++++++++++
 1 files changed, 75 insertions(+), 0 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/dma/mmp-dma.txt

Quoted 7 lines · Vinod Koul

Quoted 6 lines · Haojian Zhuang

Quoted 5 lines · Vinod Koul

Quoted 2 lines · Zhangfei Gao

Signed-off-by Zhangfei Gao <[email protected]>

Acked-by Arnd Bergmann <[email protected]>

Acked-by Vinod Koul <[email protected]>

Quoted 16 lines

Quoted 5 lines

Quoted 3 lines

I think this patch should be merged in tree having this file, possibly arm tree?

You can merge this patch into your tree since it only appends a new file.

And as I have said previously my tree or linus's tree doesn't have this file. SO this needs to go to a tree where thsi file exists

Quoted 6 lines

Acked-by Haojian Zhuang <[email protected]>

Quoted 4 lines

Quoted 4 lines

 Documentation/devicetree/bindings/dma/mmp-dma.txt |   75 +++++++++++++++++++++
 1 files changed, 75 insertions(+), 0 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/dma/mmp-dma.txt

Thanks Vinod for the BIG help.

Arnd

Which tree you think is suitable to take this new file? Documentation/devicetree/bindings/dma/mmp-dma.txt

Thanks