dbdma.c revision 1.7 
1/*	$NetBSD: dbdma.c,v 1.7 2005/12/24 23:24:01 perry Exp $	*/
2
3/*
4 * Copyright 1991-1998 by Open Software Foundation, Inc.
5 *              All Rights Reserved
6 *
7 * Permission to use, copy, modify, and distribute this software and
8 * its documentation for any purpose and without fee is hereby granted,
9 * provided that the above copyright notice appears in all copies and
10 * that both the copyright notice and this permission notice appear in
11 * supporting documentation.
12 *
13 * OSF DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
14 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
15 * FOR A PARTICULAR PURPOSE.
16 *
17 * IN NO EVENT SHALL OSF BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
18 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
19 * LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
20 * NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
21 * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
22 *
23 */
24
25#include <sys/cdefs.h>
26__KERNEL_RCSID(0, "$NetBSD: dbdma.c,v 1.7 2005/12/24 23:24:01 perry Exp $");
27
28#include <sys/param.h>
29#include <sys/malloc.h>
30#include <sys/systm.h>
31
32#include <uvm/uvm_extern.h>
33
34#include <machine/pio.h>
35#include <macppc/dev/dbdma.h>
36
37#define eieio() __asm volatile("eieio")
38
39
40dbdma_command_t	*dbdma_alloc_commands = NULL;
41
42void
43dbdma_start(dmap, commands)
44	dbdma_regmap_t *dmap;
45	dbdma_command_t *commands;
46{
47	unsigned long addr = vtophys((vaddr_t)commands);
48
49	if (addr & 0xf)
50		panic("dbdma_start command structure not 16-byte aligned");
51
52	dmap->d_intselect = 0xff;  /* Endian magic - clear out interrupts */
53	DBDMA_ST4_ENDIAN(&dmap->d_control,
54			 DBDMA_CLEAR_CNTRL( (DBDMA_CNTRL_ACTIVE	|
55					     DBDMA_CNTRL_DEAD	|
56					     DBDMA_CNTRL_WAKE	|
57					     DBDMA_CNTRL_FLUSH	|
58					     DBDMA_CNTRL_PAUSE	|
59					     DBDMA_CNTRL_RUN      )));
60	eieio();
61
62	while (DBDMA_LD4_ENDIAN(&dmap->d_status) & DBDMA_CNTRL_ACTIVE)
63		eieio();
64
65	dmap->d_cmdptrhi = 0;	eieio();/* 64-bit not yet */
66	DBDMA_ST4_ENDIAN(&dmap->d_cmdptrlo, addr); eieio();
67
68	DBDMA_ST4_ENDIAN(&dmap->d_control, DBDMA_SET_CNTRL(DBDMA_CNTRL_RUN));
69	eieio();
70}
71
72void
73dbdma_stop(dmap)
74	dbdma_regmap_t *dmap;
75{
76	out32rb(&dmap->d_control, DBDMA_CLEAR_CNTRL(DBDMA_CNTRL_RUN) |
77			  DBDMA_SET_CNTRL(DBDMA_CNTRL_FLUSH));
78
79	while (in32rb(&dmap->d_status) &
80		(DBDMA_CNTRL_ACTIVE|DBDMA_CNTRL_FLUSH));
81}
82
83void
84dbdma_flush(dmap)
85	dbdma_regmap_t *dmap;
86{
87	out32rb(&dmap->d_control, DBDMA_SET_CNTRL(DBDMA_CNTRL_FLUSH));
88
89	while (in32rb(&dmap->d_status) & (DBDMA_CNTRL_FLUSH));
90}
91
92void
93dbdma_reset(dmap)
94	dbdma_regmap_t *dmap;
95{
96	out32rb(&dmap->d_control,
97			 DBDMA_CLEAR_CNTRL( (DBDMA_CNTRL_ACTIVE	|
98					     DBDMA_CNTRL_DEAD	|
99					     DBDMA_CNTRL_WAKE	|
100					     DBDMA_CNTRL_FLUSH	|
101					     DBDMA_CNTRL_PAUSE	|
102					     DBDMA_CNTRL_RUN      )));
103
104	while (in32rb(&dmap->d_status) & DBDMA_CNTRL_RUN);
105}
106
107void
108dbdma_continue(dmap)
109	dbdma_regmap_t *dmap;
110{
111	out32rb(&dmap->d_control,
112		DBDMA_SET_CNTRL(DBDMA_CNTRL_RUN | DBDMA_CNTRL_WAKE) |
113		DBDMA_CLEAR_CNTRL(DBDMA_CNTRL_PAUSE | DBDMA_CNTRL_DEAD));
114}
115
116void
117dbdma_pause(dmap)
118	dbdma_regmap_t *dmap;
119{
120	DBDMA_ST4_ENDIAN(&dmap->d_control,DBDMA_SET_CNTRL(DBDMA_CNTRL_PAUSE));
121	eieio();
122
123	while (DBDMA_LD4_ENDIAN(&dmap->d_status) & DBDMA_CNTRL_ACTIVE)
124		eieio();
125}
126
127dbdma_command_t	*
128dbdma_alloc(size)
129	int size;
130{
131	u_int buf;
132
133	buf = (u_int)malloc(size + 0x0f, M_DEVBUF, M_WAITOK);
134	buf = (buf + 0x0f) & ~0x0f;
135
136	return (dbdma_command_t *)buf;
137}
138