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Diffstat (limited to 'arch/powerpc/include/asm/dbdma.h')
| -rw-r--r-- | arch/powerpc/include/asm/dbdma.h | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/dbdma.h b/arch/powerpc/include/asm/dbdma.h new file mode 100644 index 0000000..e23f07e --- /dev/null +++ b/arch/powerpc/include/asm/dbdma.h @@ -0,0 +1,108 @@ +/* + * Definitions for using the Apple Descriptor-Based DMA controller + * in Power Macintosh computers. + * + * Copyright (C) 1996 Paul Mackerras. + */ + +#ifdef __KERNEL__ +#ifndef _ASM_DBDMA_H_ +#define _ASM_DBDMA_H_ +/* + * DBDMA control/status registers. All little-endian. + */ +struct dbdma_regs { + unsigned int control; /* lets you change bits in status */ + unsigned int status; /* DMA and device status bits (see below) */ + unsigned int cmdptr_hi; /* upper 32 bits of command address */ + unsigned int cmdptr; /* (lower 32 bits of) command address (phys) */ + unsigned int intr_sel; /* select interrupt condition bit */ + unsigned int br_sel; /* select branch condition bit */ + unsigned int wait_sel; /* select wait condition bit */ + unsigned int xfer_mode; + unsigned int data2ptr_hi; + unsigned int data2ptr; + unsigned int res1; + unsigned int address_hi; + unsigned int br_addr_hi; + unsigned int res2[3]; +}; + +/* Bits in control and status registers */ +#define RUN 0x8000 +#define PAUSE 0x4000 +#define FLUSH 0x2000 +#define WAKE 0x1000 +#define DEAD 0x0800 +#define ACTIVE 0x0400 +#define BT 0x0100 +#define DEVSTAT 0x00ff + +/* + * DBDMA command structure. These fields are all little-endian! + */ +struct dbdma_cmd { + unsigned short req_count; /* requested byte transfer count */ + unsigned short command; /* command word (has bit-fields) */ + unsigned int phy_addr; /* physical data address */ + unsigned int cmd_dep; /* command-dependent field */ + unsigned short res_count; /* residual count after completion */ + unsigned short xfer_status; /* transfer status */ +}; + +/* DBDMA command values in command field */ +#define OUTPUT_MORE 0 /* transfer memory data to stream */ +#define OUTPUT_LAST 0x1000 /* ditto followed by end marker */ +#define INPUT_MORE 0x2000 /* transfer stream data to memory */ +#define INPUT_LAST 0x3000 /* ditto, expect end marker */ +#define STORE_WORD 0x4000 /* write word (4 bytes) to device reg */ +#define LOAD_WORD 0x5000 /* read word (4 bytes) from device reg */ +#define DBDMA_NOP 0x6000 /* do nothing */ +#define DBDMA_STOP 0x7000 /* suspend processing */ + +/* Key values in command field */ +#define KEY_STREAM0 0 /* usual data stream */ +#define KEY_STREAM1 0x100 /* control/status stream */ +#define KEY_STREAM2 0x200 /* device-dependent stream */ +#define KEY_STREAM3 0x300 /* device-dependent stream */ +#define KEY_REGS 0x500 /* device register space */ +#define KEY_SYSTEM 0x600 /* system memory-mapped space */ +#define KEY_DEVICE 0x700 /* device memory-mapped space */ + +/* Interrupt control values in command field */ +#define INTR_NEVER 0 /* don't interrupt */ +#define INTR_IFSET 0x10 /* intr if condition bit is 1 */ +#define INTR_IFCLR 0x20 /* intr if condition bit is 0 */ +#define INTR_ALWAYS 0x30 /* always interrupt */ + +/* Branch control values in command field */ +#define BR_NEVER 0 /* don't branch */ +#define BR_IFSET 0x4 /* branch if condition bit is 1 */ +#define BR_IFCLR 0x8 /* branch if condition bit is 0 */ +#define BR_ALWAYS 0xc /* always branch */ + +/* Wait control values in command field */ +#define WAIT_NEVER 0 /* don't wait */ +#define WAIT_IFSET 1 /* wait if condition bit is 1 */ +#define WAIT_IFCLR 2 /* wait if condition bit is 0 */ +#define WAIT_ALWAYS 3 /* always wait */ + +/* Align an address for a DBDMA command structure */ +#define DBDMA_ALIGN(x) (((unsigned long)(x) + sizeof(struct dbdma_cmd) - 1) \ + & -sizeof(struct dbdma_cmd)) + +/* Useful macros */ +#define DBDMA_DO_STOP(regs) do { \ + out_le32(&((regs)->control), (RUN|FLUSH)<<16); \ + while(in_le32(&((regs)->status)) & (ACTIVE|FLUSH)) \ + ; \ +} while(0) + +#define DBDMA_DO_RESET(regs) do { \ + out_le32(&((regs)->control), (ACTIVE|DEAD|WAKE|FLUSH|PAUSE|RUN)<<16);\ + while(in_le32(&((regs)->status)) & (RUN)) \ + ; \ +} while(0) + +#endif /* _ASM_DBDMA_H_ */ +#endif /* __KERNEL__ */ |