dbdma.c revision 1.9 
1/*	$NetBSD: dbdma.c,v 1.9 2009/03/14 15:36:09 dsl 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 1.9 2009/03/14 15:36:09 dsl 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(dbdma_regmap_t *dmap, dbdma_command_t *commands)
42{
43	unsigned long addr = vtophys((vaddr_t)commands);
44
45	if (addr & 0xf)
46		panic("dbdma_start command structure not 16-byte aligned");
47
48	dmap->d_intselect = 0xff;  /* Endian magic - clear out interrupts */
49	DBDMA_ST4_ENDIAN(&dmap->d_control,
50			 DBDMA_CLEAR_CNTRL( (DBDMA_CNTRL_ACTIVE	|
51					     DBDMA_CNTRL_DEAD	|
52					     DBDMA_CNTRL_WAKE	|
53					     DBDMA_CNTRL_FLUSH	|
54					     DBDMA_CNTRL_PAUSE	|
55					     DBDMA_CNTRL_RUN      )));
56
57	while (DBDMA_LD4_ENDIAN(&dmap->d_status) & DBDMA_CNTRL_ACTIVE)
58		;
59
60	dmap->d_cmdptrhi = 0;	/* 64-bit not yet */
61	DBDMA_ST4_ENDIAN(&dmap->d_cmdptrlo, addr);
62
63	DBDMA_ST4_ENDIAN(&dmap->d_control, DBDMA_SET_CNTRL(DBDMA_CNTRL_RUN));
64}
65
66void
67dbdma_stop(dbdma_regmap_t *dmap)
68{
69	out32rb(&dmap->d_control, DBDMA_CLEAR_CNTRL(DBDMA_CNTRL_RUN) |
70			  DBDMA_SET_CNTRL(DBDMA_CNTRL_FLUSH));
71
72	while (in32rb(&dmap->d_status) &
73		(DBDMA_CNTRL_ACTIVE|DBDMA_CNTRL_FLUSH));
74}
75
76void
77dbdma_flush(dbdma_regmap_t *dmap)
78{
79	out32rb(&dmap->d_control, DBDMA_SET_CNTRL(DBDMA_CNTRL_FLUSH));
80
81	while (in32rb(&dmap->d_status) & (DBDMA_CNTRL_FLUSH));
82}
83
84void
85dbdma_reset(dbdma_regmap_t *dmap)
86{
87	out32rb(&dmap->d_control,
88			 DBDMA_CLEAR_CNTRL( (DBDMA_CNTRL_ACTIVE	|
89					     DBDMA_CNTRL_DEAD	|
90					     DBDMA_CNTRL_WAKE	|
91					     DBDMA_CNTRL_FLUSH	|
92					     DBDMA_CNTRL_PAUSE	|
93					     DBDMA_CNTRL_RUN      )));
94
95	while (in32rb(&dmap->d_status) & DBDMA_CNTRL_RUN);
96}
97
98void
99dbdma_continue(dbdma_regmap_t *dmap)
100{
101	out32rb(&dmap->d_control,
102		DBDMA_SET_CNTRL(DBDMA_CNTRL_RUN | DBDMA_CNTRL_WAKE) |
103		DBDMA_CLEAR_CNTRL(DBDMA_CNTRL_PAUSE | DBDMA_CNTRL_DEAD));
104}
105
106void
107dbdma_pause(dbdma_regmap_t *dmap)
108{
109	DBDMA_ST4_ENDIAN(&dmap->d_control,DBDMA_SET_CNTRL(DBDMA_CNTRL_PAUSE));
110
111	while (DBDMA_LD4_ENDIAN(&dmap->d_status) & DBDMA_CNTRL_ACTIVE)
112		;
113}
114
115dbdma_command_t	*
116dbdma_alloc(int size)
117{
118	u_int buf;
119
120	buf = (u_int)malloc(size + 0x0f, M_DEVBUF, M_WAITOK);
121	buf = (buf + 0x0f) & ~0x0f;
122
123	return (dbdma_command_t *)buf;
124}
125