110 lines
3.7 KiB
C
110 lines
3.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Definitions for using the Apple Descriptor-Based DMA controller
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* in Power Macintosh computers.
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*
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* Copyright (C) 1996 Paul Mackerras.
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*/
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#ifdef __KERNEL__
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#ifndef _ASM_DBDMA_H_
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#define _ASM_DBDMA_H_
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/*
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* DBDMA control/status registers. All little-endian.
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*/
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struct dbdma_regs {
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unsigned int control; /* lets you change bits in status */
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unsigned int status; /* DMA and device status bits (see below) */
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unsigned int cmdptr_hi; /* upper 32 bits of command address */
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unsigned int cmdptr; /* (lower 32 bits of) command address (phys) */
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unsigned int intr_sel; /* select interrupt condition bit */
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unsigned int br_sel; /* select branch condition bit */
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unsigned int wait_sel; /* select wait condition bit */
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unsigned int xfer_mode;
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unsigned int data2ptr_hi;
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unsigned int data2ptr;
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unsigned int res1;
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unsigned int address_hi;
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unsigned int br_addr_hi;
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unsigned int res2[3];
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};
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/* Bits in control and status registers */
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#define RUN 0x8000
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#define PAUSE 0x4000
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#define FLUSH 0x2000
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#define WAKE 0x1000
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#define DEAD 0x0800
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#define ACTIVE 0x0400
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#define BT 0x0100
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#define DEVSTAT 0x00ff
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/*
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* DBDMA command structure. These fields are all little-endian!
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*/
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struct dbdma_cmd {
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__le16 req_count; /* requested byte transfer count */
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__le16 command; /* command word (has bit-fields) */
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__le32 phy_addr; /* physical data address */
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__le32 cmd_dep; /* command-dependent field */
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__le16 res_count; /* residual count after completion */
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__le16 xfer_status; /* transfer status */
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};
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/* DBDMA command values in command field */
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#define OUTPUT_MORE 0 /* transfer memory data to stream */
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#define OUTPUT_LAST 0x1000 /* ditto followed by end marker */
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#define INPUT_MORE 0x2000 /* transfer stream data to memory */
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#define INPUT_LAST 0x3000 /* ditto, expect end marker */
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#define STORE_WORD 0x4000 /* write word (4 bytes) to device reg */
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#define LOAD_WORD 0x5000 /* read word (4 bytes) from device reg */
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#define DBDMA_NOP 0x6000 /* do nothing */
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#define DBDMA_STOP 0x7000 /* suspend processing */
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/* Key values in command field */
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#define KEY_STREAM0 0 /* usual data stream */
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#define KEY_STREAM1 0x100 /* control/status stream */
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#define KEY_STREAM2 0x200 /* device-dependent stream */
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#define KEY_STREAM3 0x300 /* device-dependent stream */
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#define KEY_REGS 0x500 /* device register space */
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#define KEY_SYSTEM 0x600 /* system memory-mapped space */
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#define KEY_DEVICE 0x700 /* device memory-mapped space */
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/* Interrupt control values in command field */
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#define INTR_NEVER 0 /* don't interrupt */
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#define INTR_IFSET 0x10 /* intr if condition bit is 1 */
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#define INTR_IFCLR 0x20 /* intr if condition bit is 0 */
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#define INTR_ALWAYS 0x30 /* always interrupt */
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/* Branch control values in command field */
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#define BR_NEVER 0 /* don't branch */
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#define BR_IFSET 0x4 /* branch if condition bit is 1 */
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#define BR_IFCLR 0x8 /* branch if condition bit is 0 */
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#define BR_ALWAYS 0xc /* always branch */
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/* Wait control values in command field */
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#define WAIT_NEVER 0 /* don't wait */
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#define WAIT_IFSET 1 /* wait if condition bit is 1 */
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#define WAIT_IFCLR 2 /* wait if condition bit is 0 */
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#define WAIT_ALWAYS 3 /* always wait */
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/* Align an address for a DBDMA command structure */
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#define DBDMA_ALIGN(x) (((unsigned long)(x) + sizeof(struct dbdma_cmd) - 1) \
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& -sizeof(struct dbdma_cmd))
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/* Useful macros */
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#define DBDMA_DO_STOP(regs) do { \
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out_le32(&((regs)->control), (RUN|FLUSH)<<16); \
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while(in_le32(&((regs)->status)) & (ACTIVE|FLUSH)) \
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; \
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} while(0)
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#define DBDMA_DO_RESET(regs) do { \
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out_le32(&((regs)->control), (ACTIVE|DEAD|WAKE|FLUSH|PAUSE|RUN)<<16);\
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while(in_le32(&((regs)->status)) & (RUN)) \
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; \
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} while(0)
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#endif /* _ASM_DBDMA_H_ */
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#endif /* __KERNEL__ */
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