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
40 dbdma_command_t *dbdma_alloc_commands = NULL;
41
42 void
dbdma_start(dbdma_regmap_t * dmap,dbdma_command_t * commands)43 dbdma_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
68 void
dbdma_stop(dbdma_regmap_t * dmap)69 dbdma_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
78 void
dbdma_flush(dbdma_regmap_t * dmap)79 dbdma_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
86 void
dbdma_reset(dbdma_regmap_t * dmap)87 dbdma_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
100 void
dbdma_continue(dbdma_regmap_t * dmap)101 dbdma_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
108 void
dbdma_pause(dbdma_regmap_t * dmap)109 dbdma_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
117 dbdma_command_t *
dbdma_alloc(int size,void ** fp)118 dbdma_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
131 void
dbdma_free(void * ptr,int size)132 dbdma_free(void *ptr, int size)
133 {
134 kmem_free(ptr, size + 0x0f);
135 }
136