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/* $OpenBSD: dbdma.h,v 1.4 2006/01/13 19:25:44 miod Exp $ */
/* $NetBSD: dbdma.h,v 1.2 1998/08/21 16:13:28 tsubai Exp $ */
/*
* Copyright 1991-1998 by Open Software Foundation, Inc.
* All Rights Reserved
*
* Permission to use, copy, modify, and distribute this software and
* its documentation for any purpose and without fee is hereby granted,
* provided that the above copyright notice appears in all copies and
* that both the copyright notice and this permission notice appear in
* supporting documentation.
*
* OSF DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE.
*
* IN NO EVENT SHALL OSF BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
* NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
#include <machine/bus.h>
#include <machine/pio.h>
#ifndef _POWERMAC_DBDMA_H_
#define _POWERMAC_DBDMA_H_
#define DBDMA_CMD_OUT_MORE 0
#define DBDMA_CMD_OUT_LAST 1
#define DBDMA_CMD_IN_MORE 2
#define DBDMA_CMD_IN_LAST 3
#define DBDMA_CMD_STORE_QUAD 4
#define DBDMA_CMD_LOAD_QUAD 5
#define DBDMA_CMD_NOP 6
#define DBDMA_CMD_STOP 7
/* Keys */
#define DBDMA_KEY_STREAM0 0
#define DBDMA_KEY_STREAM1 1
#define DBDMA_KEY_STREAM2 2
#define DBDMA_KEY_STREAM3 3
/* value 4 is reserved */
#define DBDMA_KEY_REGS 5
#define DBDMA_KEY_SYSTEM 6
#define DBDMA_KEY_DEVICE 7
#define DBDMA_INT_NEVER 0
#define DBDMA_INT_IF_TRUE 1
#define DBDMA_INT_IF_FALSE 2
#define DBDMA_INT_ALWAYS 3
#define DBDMA_BRANCH_NEVER 0
#define DBDMA_BRANCH_IF_TRUE 1
#define DBDMA_BRANCH_IF_FALSE 2
#define DBDMA_BRANCH_ALWAYS 3
#define DBDMA_WAIT_NEVER 0
#define DBDMA_WAIT_IF_TRUE 1
#define DBDMA_WAIT_IF_FALSE 2
#define DBDMA_WAIT_ALWAYS 3
/* Channels */
#define DBDMA_SCSI0 0x0
#define DBDMA_CURIO_SCSI DBDMA_SCSI0
#define DBDMA_FLOPPY 0x1
#define DBDMA_ETHERNET_TX 0x2
#define DBDMA_ETHERNET_RV 0x3
#define DBDMA_SCC_XMIT_A 0x4
#define DBDMA_SCC_RECV_A 0x5
#define DBDMA_SCC_XMIT_B 0x6
#define DBDMA_SCC_RECV_B 0x7
#define DBDMA_AUDIO_OUT 0x8
#define DBDMA_AUDIO_IN 0x9
#define DBDMA_SCSI1 0xA
/* Control register values (in little endian) */
#define DBDMA_STATUS_MASK 0x000000ff /* Status Mask */
#define DBDMA_CNTRL_BRANCH 0x00000100
/* 0x200 reserved */
#define DBDMA_CNTRL_ACTIVE 0x00000400
#define DBDMA_CNTRL_DEAD 0x00000800
#define DBDMA_CNTRL_WAKE 0x00001000
#define DBDMA_CNTRL_FLUSH 0x00002000
#define DBDMA_CNTRL_PAUSE 0x00004000
#define DBDMA_CNTRL_RUN 0x00008000
#define DBDMA_SET_CNTRL(x) ( ((x) | (x) << 16) )
#define DBDMA_CLEAR_CNTRL(x) ( (x) << 16)
#define DBDMA_COUNT_MAX 0x8000
#define DBDMA_REGMAP(channel) \
(dbdma_regmap_t *)((v_u_char *) POWERMAC_IO(PCI_DMA_BASE_PHYS) \
+ (channel << 8))
/* This struct is layout in little endian format */
struct dbdma_command {
u_int16_t d_count;
u_int16_t d_command;
u_int32_t d_address;
u_int32_t d_cmddep;
u_int16_t d_resid;
u_int16_t d_status;
};
typedef struct dbdma_command dbdma_command_t;
#define DBDMA_BUILD_CMD(d, cmd, key, interrupt, wait, branch) { \
dbdma_st16(&(d)->d_command, \
((cmd) << 12) | ((key) << 8) | \
((interrupt) << 4) | \
((branch) << 2) | (wait)); \
}
#define DBDMA_BUILD(d, cmd, key, count, address, interrupt, wait, branch) { \
dbdma_st16(&(d)->d_count, count); \
dbdma_st32(&(d)->d_address, address); \
(d)->d_resid = 0; \
(d)->d_status = 0; \
(d)->d_cmddep = 0; \
dbdma_st16(&(d)->d_command, \
((cmd) << 12) | ((key) << 8) | \
((interrupt) << 4) | \
((branch) << 2) | (wait)); \
}
#if 0
static __inline__ void
dbdma_st32(a, x)
volatile u_int32_t *a;
u_int32_t x;
{
__asm__ volatile
("stwbrx %0,0,%1" : : "r" (x), "r" (a) : "memory");
__asm__ volatile ("eieio");
}
static __inline__ void
dbdma_st16(a, x)
volatile u_int16_t *a;
u_int16_t x;
{
__asm__ volatile
("sthbrx %0,0,%1" : : "r" (x), "r" (a) : "memory");
__asm__ volatile ("eieio");
}
static __inline__ u_int32_t
dbdma_ld32(a)
volatile u_int32_t *a;
{
u_int32_t swap;
__asm__ volatile ("eieio");
__asm__ volatile
("lwbrx %0,0,%1" : "=r" (swap) : "r" (a));
return swap;
}
static __inline__ u_int16_t
dbdma_ld16(a)
volatile u_int16_t *a;
{
u_int16_t swap;
__asm__ volatile ("eieio");
__asm__ volatile
("lhbrx %0,0,%1" : "=r" (swap) : "r" (a));
return swap;
}
#define DBDMA_LD4_ENDIAN(a) dbdma_ld32(a)
#define DBDMA_ST4_ENDIAN(a, x) dbdma_st32(a, x)
#else
#define DBDMA_LD4_ENDIAN(a) in32rb(a)
#define DBDMA_ST4_ENDIAN(a, x) out32rb(a, x)
#define dbdma_st16(a,x) out16rb((a),(x))
#define dbdma_ld16(a) in16rb(a)
#define dbdma_st32(a,x) out32rb((a),(x))
#define dbdma_ld32(a) in32rb(a)
#endif
/*
* DBDMA Channel layout
*
* NOTE - This structure is in little-endian format.
*/
struct dbdma_regmap {
u_int32_t d_control; /* Control Register */
u_int32_t d_status; /* DBDMA Status Register */
u_int32_t d_cmdptrhi; /* MSB of command pointer (not used yet) */
u_int32_t d_cmdptrlo; /* LSB of command pointer */
u_int32_t d_intselect; /* Interrupt Select */
u_int32_t d_branch; /* Branch selection */
u_int32_t d_wait; /* Wait selection */
u_int32_t d_transmode; /* Transfer modes */
u_int32_t d_dataptrhi; /* MSB of Data Pointer */
u_int32_t d_dataptrlo; /* LSB of Data Pointer */
u_int32_t d_reserved; /* Reserved for the moment */
u_int32_t d_branchptrhi; /* MSB of Branch Pointer */
u_int32_t d_branchptrlo; /* LSB of Branch Pointer */
/* The remaining fields are undefinied and unimplemented */
};
typedef volatile struct dbdma_regmap dbdma_regmap_t;
/* DBDMA routines */
typedef
struct dbdma_desc {
bus_dma_tag_t d_dmat;
bus_dmamap_t d_map;
dbdma_command_t *d_addr;
#define d_paddr d_segs->ds_addr
bus_dma_segment_t d_segs[1];
int d_nsegs;
size_t d_size;
} *dbdma_t;
dbdma_t dbdma_alloc(bus_dma_tag_t, int); /* Allocate command structures */
void dbdma_free(dbdma_t); /* Dispose command structures */
void dbdma_start(dbdma_regmap_t *channel, dbdma_t dt);
void dbdma_stop(dbdma_regmap_t *channel);
void dbdma_flush(dbdma_regmap_t *channel);
void dbdma_reset(dbdma_regmap_t *channel);
void dbdma_continue(dbdma_regmap_t *channel);
void dbdma_pause(dbdma_regmap_t *channel);
#endif /* !defined(_POWERMAC_DBDMA_H_) */
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