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authorEric Miao <eric.miao@marvell.com>2009-01-20 07:06:01 +0300
committerEric Miao <eric.miao@marvell.com>2009-03-23 05:11:31 +0300
commitbd5ce4332328c1fe473690a86b2e6a4157be038f (patch)
tree785aa105d3752b2df92b1792e799e3f39e1b0411 /arch/arm/plat-pxa/include
parente2bb5befd7b0ae2d045f4413a97db52340edec13 (diff)
downloadlinux-bd5ce4332328c1fe473690a86b2e6a4157be038f.tar.xz
[ARM] pxa: introduce plat-pxa for PXA common code and add DMA support
1. introduce folder of 'arch/arm/plat-pxa' for common code across different PXA processor families 2. initially moved DMA code into plat-pxa 3. common code in <mach/dma.h> moved into <plat/dma.h>, new processors should implement its own <mach/dma.h>, provide the following required definitions and '#include <plat/dma.h>' in the end: - DMAC_REGS_VIRT for mapped virtual address of the DMA registers' physical I/O memory Signed-off-by: Eric Miao <eric.miao@marvell.com>
Diffstat (limited to 'arch/arm/plat-pxa/include')
-rw-r--r--arch/arm/plat-pxa/include/plat/dma.h85
1 files changed, 85 insertions, 0 deletions
diff --git a/arch/arm/plat-pxa/include/plat/dma.h b/arch/arm/plat-pxa/include/plat/dma.h
new file mode 100644
index 000000000000..a7b91dc06852
--- /dev/null
+++ b/arch/arm/plat-pxa/include/plat/dma.h
@@ -0,0 +1,85 @@
+#ifndef __PLAT_DMA_H
+#define __PLAT_DMA_H
+
+#define DMAC_REG(x) (*((volatile u32 *)(DMAC_REGS_VIRT + (x))))
+
+#define DCSR(n) DMAC_REG((n) << 2)
+#define DALGN DMAC_REG(0x00a0) /* DMA Alignment Register */
+#define DINT DMAC_REG(0x00f0) /* DMA Interrupt Register */
+#define DDADR(n) DMAC_REG(0x0200 + ((n) << 4))
+#define DSADR(n) DMAC_REG(0x0204 + ((n) << 4))
+#define DTADR(n) DMAC_REG(0x0208 + ((n) << 4))
+#define DCMD(n) DMAC_REG(0x020c + ((n) << 4))
+#define DRCMR(n) DMAC_REG((((n) < 64) ? 0x0100 : 0x1100) + \
+ (((n) & 0x3f) << 2))
+
+#define DCSR_RUN (1 << 31) /* Run Bit (read / write) */
+#define DCSR_NODESC (1 << 30) /* No-Descriptor Fetch (read / write) */
+#define DCSR_STOPIRQEN (1 << 29) /* Stop Interrupt Enable (read / write) */
+#define DCSR_REQPEND (1 << 8) /* Request Pending (read-only) */
+#define DCSR_STOPSTATE (1 << 3) /* Stop State (read-only) */
+#define DCSR_ENDINTR (1 << 2) /* End Interrupt (read / write) */
+#define DCSR_STARTINTR (1 << 1) /* Start Interrupt (read / write) */
+#define DCSR_BUSERR (1 << 0) /* Bus Error Interrupt (read / write) */
+
+#define DCSR_EORIRQEN (1 << 28) /* End of Receive Interrupt Enable (R/W) */
+#define DCSR_EORJMPEN (1 << 27) /* Jump to next descriptor on EOR */
+#define DCSR_EORSTOPEN (1 << 26) /* STOP on an EOR */
+#define DCSR_SETCMPST (1 << 25) /* Set Descriptor Compare Status */
+#define DCSR_CLRCMPST (1 << 24) /* Clear Descriptor Compare Status */
+#define DCSR_CMPST (1 << 10) /* The Descriptor Compare Status */
+#define DCSR_EORINTR (1 << 9) /* The end of Receive */
+
+#define DRCMR_MAPVLD (1 << 7) /* Map Valid (read / write) */
+#define DRCMR_CHLNUM 0x1f /* mask for Channel Number (read / write) */
+
+#define DDADR_DESCADDR 0xfffffff0 /* Address of next descriptor (mask) */
+#define DDADR_STOP (1 << 0) /* Stop (read / write) */
+
+#define DCMD_INCSRCADDR (1 << 31) /* Source Address Increment Setting. */
+#define DCMD_INCTRGADDR (1 << 30) /* Target Address Increment Setting. */
+#define DCMD_FLOWSRC (1 << 29) /* Flow Control by the source. */
+#define DCMD_FLOWTRG (1 << 28) /* Flow Control by the target. */
+#define DCMD_STARTIRQEN (1 << 22) /* Start Interrupt Enable */
+#define DCMD_ENDIRQEN (1 << 21) /* End Interrupt Enable */
+#define DCMD_ENDIAN (1 << 18) /* Device Endian-ness. */
+#define DCMD_BURST8 (1 << 16) /* 8 byte burst */
+#define DCMD_BURST16 (2 << 16) /* 16 byte burst */
+#define DCMD_BURST32 (3 << 16) /* 32 byte burst */
+#define DCMD_WIDTH1 (1 << 14) /* 1 byte width */
+#define DCMD_WIDTH2 (2 << 14) /* 2 byte width (HalfWord) */
+#define DCMD_WIDTH4 (3 << 14) /* 4 byte width (Word) */
+#define DCMD_LENGTH 0x01fff /* length mask (max = 8K - 1) */
+
+/*
+ * Descriptor structure for PXA's DMA engine
+ * Note: this structure must always be aligned to a 16-byte boundary.
+ */
+
+typedef struct pxa_dma_desc {
+ volatile u32 ddadr; /* Points to the next descriptor + flags */
+ volatile u32 dsadr; /* DSADR value for the current transfer */
+ volatile u32 dtadr; /* DTADR value for the current transfer */
+ volatile u32 dcmd; /* DCMD value for the current transfer */
+} pxa_dma_desc;
+
+typedef enum {
+ DMA_PRIO_HIGH = 0,
+ DMA_PRIO_MEDIUM = 1,
+ DMA_PRIO_LOW = 2
+} pxa_dma_prio;
+
+/*
+ * DMA registration
+ */
+
+int __init pxa_init_dma(int irq, int num_ch);
+
+int pxa_request_dma (char *name,
+ pxa_dma_prio prio,
+ void (*irq_handler)(int, void *),
+ void *data);
+
+void pxa_free_dma (int dma_ch);
+
+#endif /* __PLAT_DMA_H */