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/* SPDX-License-Identifier: GPL-2.0 */
/*
 * 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 {
	__le16 req_count;	/* requested byte transfer count */
	__le16 command;		/* command word (has bit-fields) */
	__le32 phy_addr;	/* physical data address */
	__le32 cmd_dep;		/* command-dependent field */
	__le16 res_count;	/* residual count after completion */
	__le16 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__ */

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book3s Folder 0755
nohash Folder 0755
8xx_immap.h File 13.77 KB 0644
Kbuild File 248 B 0644
accounting.h File 1 KB 0644
agp.h File 525 B 0644
archrandom.h File 1016 B 0644
asm-compat.h File 2.53 KB 0644
asm-offsets.h File 35 B 0644
asm-prototypes.h File 4.78 KB 0644
async_tx.h File 1.64 KB 0644
atomic.h File 13.57 KB 0644
backlight.h File 1.09 KB 0644
barrier.h File 3.57 KB 0644
bitops.h File 7.8 KB 0644
bootx.h File 1.12 KB 0644
btext.h File 926 B 0644
bug.h File 3.55 KB 0644
bugs.h File 486 B 0644
cache.h File 2.47 KB 0644
cacheflush.h File 3.76 KB 0644
cell-pmu.h File 4.04 KB 0644
cell-regs.h File 9.57 KB 0644
checksum.h File 5.85 KB 0644
cmpxchg.h File 12.16 KB 0644
code-patching-asm.h File 397 B 0644
code-patching.h File 5.01 KB 0644
compat.h File 6.26 KB 0644
context_tracking.h File 245 B 0644
copro.h File 769 B 0644
cpm.h File 5.09 KB 0644
cpm1.h File 21.08 KB 0644
cpm2.h File 48.43 KB 0644
cpu_has_feature.h File 1.31 KB 0644
cpufeature.h File 1.18 KB 0644
cpuidle.h File 3.31 KB 0644
cputable.h File 22.56 KB 0644
cputhreads.h File 2.92 KB 0644
cputime.h File 1.59 KB 0644
current.h File 835 B 0644
dbdma.h File 3.72 KB 0644
dbell.h File 2.78 KB 0644
dcr-generic.h File 1.58 KB 0644
dcr-mmio.h File 1.68 KB 0644
dcr-native.h File 4.42 KB 0644
dcr-regs.h File 5.71 KB 0644
dcr.h File 2.73 KB 0644
debug.h File 1.97 KB 0644
debugfs.h File 489 B 0644
delay.h File 3.42 KB 0644
device.h File 1.1 KB 0644
disassemble.h File 2.73 KB 0644
dma-mapping.h File 4.12 KB 0644
dma.h File 10.51 KB 0644
dt_cpu_ftrs.h File 816 B 0644
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elf.h File 6.29 KB 0644
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kvm_book3s.h File 12.06 KB 0644
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kvm_book3s_64.h File 12.62 KB 0644
kvm_book3s_asm.h File 4.4 KB 0644
kvm_booke.h File 2.68 KB 0644
kvm_booke_hv_asm.h File 2.03 KB 0644
kvm_fpu.h File 2.74 KB 0644
kvm_host.h File 19.92 KB 0644
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linkage.h File 501 B 0644
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pasemi_dma.h File 23.32 KB 0644
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pci.h File 4.58 KB 0644
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perf_event_server.h File 6.3 KB 0644
pgalloc.h File 620 B 0644
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pmac_feature.h File 13.08 KB 0644
pmac_low_i2c.h File 3.24 KB 0644
pmac_pfunc.h File 8.01 KB 0644
pmc.h File 1.35 KB 0644
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pnv-ocxl.h File 1.4 KB 0644
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ppc-pci.h File 2.69 KB 0644
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ppc4xx_ocm.h File 1.41 KB 0644
ppc_asm.h File 21.63 KB 0644
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processor.h File 15 KB 0644
prom.h File 7.17 KB 0644
ps3.h File 15.44 KB 0644
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ps3gpu.h File 2.44 KB 0644
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reg.h File 61.61 KB 0644
reg_8xx.h File 4.96 KB 0644
reg_a2.h File 6.16 KB 0644
reg_booke.h File 36.17 KB 0644
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security_features.h File 3.03 KB 0644
serial.h File 677 B 0644
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signal.h File 225 B 0644
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types.h File 1 KB 0644
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