xref: /netbsd-src/sys/arch/macppc/dev/dbdma.c (revision 30ed9f0405d4b501f858308fc9d9634867dc5d34)
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