dbdma.c revision 1.8 
1/*	$NetBSD: dbdma.c,v 1.8 2007/10/17 19:55:18 garbled 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 1.8 2007/10/17 19:55:18 garbled 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/autoconf.h>
35#include <machine/pio.h>
36#include <macppc/dev/dbdma.h>
37
38dbdma_command_t	*dbdma_alloc_commands = NULL;
39
40void
41dbdma_start(dmap, commands)
42	dbdma_regmap_t *dmap;
43	dbdma_command_t *commands;
44{
45	unsigned long addr = vtophys((vaddr_t)commands);
46
47	if (addr & 0xf)
48		panic("dbdma_start command structure not 16-byte aligned");
49
50	dmap->d_intselect = 0xff;  /* Endian magic - clear out interrupts */
51	DBDMA_ST4_ENDIAN(&dmap->d_control,
52			 DBDMA_CLEAR_CNTRL( (DBDMA_CNTRL_ACTIVE	|
53					     DBDMA_CNTRL_DEAD	|
54					     DBDMA_CNTRL_WAKE	|
55					     DBDMA_CNTRL_FLUSH	|
56					     DBDMA_CNTRL_PAUSE	|
57					     DBDMA_CNTRL_RUN      )));
58
59	while (DBDMA_LD4_ENDIAN(&dmap->d_status) & DBDMA_CNTRL_ACTIVE)
60		;
61
62	dmap->d_cmdptrhi = 0;	/* 64-bit not yet */
63	DBDMA_ST4_ENDIAN(&dmap->d_cmdptrlo, addr);
64
65	DBDMA_ST4_ENDIAN(&dmap->d_control, DBDMA_SET_CNTRL(DBDMA_CNTRL_RUN));
66}
67
68void
69dbdma_stop(dmap)
70	dbdma_regmap_t *dmap;
71{
72	out32rb(&dmap->d_control, DBDMA_CLEAR_CNTRL(DBDMA_CNTRL_RUN) |
73			  DBDMA_SET_CNTRL(DBDMA_CNTRL_FLUSH));
74
75	while (in32rb(&dmap->d_status) &
76		(DBDMA_CNTRL_ACTIVE|DBDMA_CNTRL_FLUSH));
77}
78
79void
80dbdma_flush(dmap)
81	dbdma_regmap_t *dmap;
82{
83	out32rb(&dmap->d_control, DBDMA_SET_CNTRL(DBDMA_CNTRL_FLUSH));
84
85	while (in32rb(&dmap->d_status) & (DBDMA_CNTRL_FLUSH));
86}
87
88void
89dbdma_reset(dmap)
90	dbdma_regmap_t *dmap;
91{
92	out32rb(&dmap->d_control,
93			 DBDMA_CLEAR_CNTRL( (DBDMA_CNTRL_ACTIVE	|
94					     DBDMA_CNTRL_DEAD	|
95					     DBDMA_CNTRL_WAKE	|
96					     DBDMA_CNTRL_FLUSH	|
97					     DBDMA_CNTRL_PAUSE	|
98					     DBDMA_CNTRL_RUN      )));
99
100	while (in32rb(&dmap->d_status) & DBDMA_CNTRL_RUN);
101}
102
103void
104dbdma_continue(dmap)
105	dbdma_regmap_t *dmap;
106{
107	out32rb(&dmap->d_control,
108		DBDMA_SET_CNTRL(DBDMA_CNTRL_RUN | DBDMA_CNTRL_WAKE) |
109		DBDMA_CLEAR_CNTRL(DBDMA_CNTRL_PAUSE | DBDMA_CNTRL_DEAD));
110}
111
112void
113dbdma_pause(dmap)
114	dbdma_regmap_t *dmap;
115{
116	DBDMA_ST4_ENDIAN(&dmap->d_control,DBDMA_SET_CNTRL(DBDMA_CNTRL_PAUSE));
117
118	while (DBDMA_LD4_ENDIAN(&dmap->d_status) & DBDMA_CNTRL_ACTIVE)
119		;
120}
121
122dbdma_command_t	*
123dbdma_alloc(size)
124	int size;
125{
126	u_int buf;
127
128	buf = (u_int)malloc(size + 0x0f, M_DEVBUF, M_WAITOK);
129	buf = (buf + 0x0f) & ~0x0f;
130
131	return (dbdma_command_t *)buf;
132}
133