1/*	$NetBSD: dbdma.c,v 1.12 2016/07/15 21:08:27 macallan 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 1.12 2016/07/15 21:08:27 macallan Exp $");
27
28#include <sys/param.h>
29#include <sys/kmem.h>
30#include <sys/systm.h>
31
32#include <prop/proplib.h>
33
34#include <uvm/uvm_extern.h>
35
36#include <machine/autoconf.h>
37#include <machine/pio.h>
38#include <macppc/dev/dbdma.h>
39
40dbdma_command_t	*dbdma_alloc_commands = NULL;
41
42void
43dbdma_start(dbdma_regmap_t *dmap, 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 %08x %08x", (uint32_t)commands, (uint32_t)addr);
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(dbdma_regmap_t *dmap)
70{
71	out32rb(&dmap->d_control, DBDMA_CLEAR_CNTRL(DBDMA_CNTRL_RUN) |
72			  DBDMA_SET_CNTRL(DBDMA_CNTRL_FLUSH));
73
74	while (in32rb(&dmap->d_status) &
75		(DBDMA_CNTRL_ACTIVE|DBDMA_CNTRL_FLUSH));
76}
77
78void
79dbdma_flush(dbdma_regmap_t *dmap)
80{
81	out32rb(&dmap->d_control, DBDMA_SET_CNTRL(DBDMA_CNTRL_FLUSH));
82
83	while (in32rb(&dmap->d_status) & (DBDMA_CNTRL_FLUSH));
84}
85
86void
87dbdma_reset(dbdma_regmap_t *dmap)
88{
89	out32rb(&dmap->d_control,
90			 DBDMA_CLEAR_CNTRL( (DBDMA_CNTRL_ACTIVE	|
91					     DBDMA_CNTRL_DEAD	|
92					     DBDMA_CNTRL_WAKE	|
93					     DBDMA_CNTRL_FLUSH	|
94					     DBDMA_CNTRL_PAUSE	|
95					     DBDMA_CNTRL_RUN      )));
96
97	while (in32rb(&dmap->d_status) & DBDMA_CNTRL_RUN);
98}
99
100void
101dbdma_continue(dbdma_regmap_t *dmap)
102{
103	out32rb(&dmap->d_control,
104		DBDMA_SET_CNTRL(DBDMA_CNTRL_RUN | DBDMA_CNTRL_WAKE) |
105		DBDMA_CLEAR_CNTRL(DBDMA_CNTRL_PAUSE | DBDMA_CNTRL_DEAD));
106}
107
108void
109dbdma_pause(dbdma_regmap_t *dmap)
110{
111	DBDMA_ST4_ENDIAN(&dmap->d_control,DBDMA_SET_CNTRL(DBDMA_CNTRL_PAUSE));
112
113	while (DBDMA_LD4_ENDIAN(&dmap->d_status) & DBDMA_CNTRL_ACTIVE)
114		;
115}
116
117dbdma_command_t	*
118dbdma_alloc(int size, void **fp)
119{
120	u_int buf;
121
122	buf = (u_int)kmem_alloc(size + 0x0f, KM_SLEEP);
123	if (fp != NULL) {
124	 *fp = (void *)buf;
125        }
126	buf = (buf + 0x0f) & ~0x0f;
127
128	return (dbdma_command_t *)buf;
129}
130
131void
132dbdma_free(void *ptr, int size)
133{
134	kmem_free(ptr, size + 0x0f);
135}
136