1 files changed, 117 insertions, 0 deletions
diff --git a/arch/arm/mach-sa1100/include/mach/dma.h b/arch/arm/mach-sa1100/include/mach/dma.h
new file mode 100644
index 0000000..dda1b35
--- /dev/null
+++ b/arch/arm/mach-sa1100/include/mach/dma.h
@@ -0,0 +1,117 @@
+/*
+ * arch/arm/mach-sa1100/include/mach/dma.h
+ *
+ * Generic SA1100 DMA support
+ *
+ * Copyright (C) 2000 Nicolas Pitre
+ *
+ */
+
+#ifndef __ASM_ARCH_DMA_H
+#define __ASM_ARCH_DMA_H
+
+#include "hardware.h"
+
+
+/*
+ * The SA1100 has six internal DMA channels.
+ */
+#define SA1100_DMA_CHANNELS	6
+
+/*
+ * Maximum physical DMA buffer size
+ */
+#define MAX_DMA_SIZE		0x1fff
+#define CUT_DMA_SIZE		0x1000
+
+/*
+ * All possible SA1100 devices a DMA channel can be attached to.
+ */
+typedef enum {
+	DMA_Ser0UDCWr  = DDAR_Ser0UDCWr,   /* Ser. port 0 UDC Write */
+	DMA_Ser0UDCRd  = DDAR_Ser0UDCRd,   /* Ser. port 0 UDC Read */
+	DMA_Ser1UARTWr = DDAR_Ser1UARTWr,  /* Ser. port 1 UART Write */
+	DMA_Ser1UARTRd = DDAR_Ser1UARTRd,  /* Ser. port 1 UART Read */
+	DMA_Ser1SDLCWr = DDAR_Ser1SDLCWr,  /* Ser. port 1 SDLC Write */
+	DMA_Ser1SDLCRd = DDAR_Ser1SDLCRd,  /* Ser. port 1 SDLC Read */
+	DMA_Ser2UARTWr = DDAR_Ser2UARTWr,  /* Ser. port 2 UART Write */
+	DMA_Ser2UARTRd = DDAR_Ser2UARTRd,  /* Ser. port 2 UART Read */
+	DMA_Ser2HSSPWr = DDAR_Ser2HSSPWr,  /* Ser. port 2 HSSP Write */
+	DMA_Ser2HSSPRd = DDAR_Ser2HSSPRd,  /* Ser. port 2 HSSP Read */
+	DMA_Ser3UARTWr = DDAR_Ser3UARTWr,  /* Ser. port 3 UART Write */
+	DMA_Ser3UARTRd = DDAR_Ser3UARTRd,  /* Ser. port 3 UART Read */
+	DMA_Ser4MCP0Wr = DDAR_Ser4MCP0Wr,  /* Ser. port 4 MCP 0 Write (audio) */
+	DMA_Ser4MCP0Rd = DDAR_Ser4MCP0Rd,  /* Ser. port 4 MCP 0 Read (audio) */
+	DMA_Ser4MCP1Wr = DDAR_Ser4MCP1Wr,  /* Ser. port 4 MCP 1 Write */
+	DMA_Ser4MCP1Rd = DDAR_Ser4MCP1Rd,  /* Ser. port 4 MCP 1 Read */
+	DMA_Ser4SSPWr  = DDAR_Ser4SSPWr,   /* Ser. port 4 SSP Write (16 bits) */
+	DMA_Ser4SSPRd  = DDAR_Ser4SSPRd    /* Ser. port 4 SSP Read (16 bits) */
+} dma_device_t;
+
+typedef struct {
+	volatile u_long DDAR;
+	volatile u_long SetDCSR;
+	volatile u_long ClrDCSR;
+	volatile u_long RdDCSR;
+	volatile dma_addr_t DBSA;
+	volatile u_long DBTA;
+	volatile dma_addr_t DBSB;
+	volatile u_long DBTB;
+} dma_regs_t;
+
+typedef void (*dma_callback_t)(void *data);
+
+/*
+ * DMA function prototypes
+ */
+
+extern int sa1100_request_dma( dma_device_t device, const char *device_id,
+			       dma_callback_t callback, void *data,
+			       dma_regs_t **regs );
+extern void sa1100_free_dma( dma_regs_t *regs );
+extern int sa1100_start_dma( dma_regs_t *regs, dma_addr_t dma_ptr, u_int size );
+extern dma_addr_t sa1100_get_dma_pos(dma_regs_t *regs);
+extern void sa1100_reset_dma(dma_regs_t *regs);
+
+/**
+ * 	sa1100_stop_dma - stop DMA in progress
+ * 	@regs: identifier for the channel to use
+ *
+ * 	This stops DMA without clearing buffer pointers. Unlike
+ * 	sa1100_clear_dma() this allows subsequent use of sa1100_resume_dma()
+ * 	or sa1100_get_dma_pos().
+ *
+ * 	The @regs identifier is provided by a successful call to
+ * 	sa1100_request_dma().
+ **/
+
+#define sa1100_stop_dma(regs)	((regs)->ClrDCSR = DCSR_IE|DCSR_RUN)
+
+/**
+ * 	sa1100_resume_dma - resume DMA on a stopped channel
+ * 	@regs: identifier for the channel to use
+ *
+ * 	This resumes DMA on a channel previously stopped with
+ * 	sa1100_stop_dma().
+ *
+ * 	The @regs identifier is provided by a successful call to
+ * 	sa1100_request_dma().
+ **/
+
+#define sa1100_resume_dma(regs)	((regs)->SetDCSR = DCSR_IE|DCSR_RUN)
+
+/**
+ * 	sa1100_clear_dma - clear DMA pointers
+ * 	@regs: identifier for the channel to use
+ *
+ * 	This clear any DMA state so the DMA engine is ready to restart
+ * 	with new buffers through sa1100_start_dma(). Any buffers in flight
+ * 	are discarded.
+ *
+ * 	The @regs identifier is provided by a successful call to
+ * 	sa1100_request_dma().
+ **/
+
+#define sa1100_clear_dma(regs)	((regs)->ClrDCSR = DCSR_IE|DCSR_RUN|DCSR_STRTA|DCSR_STRTB)
+
+#endif /* _ASM_ARCH_DMA_H */