b8b572e101
from include/asm-powerpc. This is the result of a mkdir arch/powerpc/include/asm git mv include/asm-powerpc/* arch/powerpc/include/asm Followed by a few documentation/comment fixups and a couple of places where <asm-powepc/...> was being used explicitly. Of the latter only one was outside the arch code and it is a driver only built for powerpc. Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
109 lines
3.7 KiB
C
109 lines
3.7 KiB
C
/*
|
|
* 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__ */
|