isa_machdep.c revision 1.15 
1/*	$NetBSD: isa_machdep.c,v 1.15 2012/10/27 17:18:03 chs Exp $	*/
2
3/*
4 * Copyright (c) 2001 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Wayne Knowles
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33__KERNEL_RCSID(0, "$NetBSD: isa_machdep.c,v 1.15 2012/10/27 17:18:03 chs Exp $");
34
35#include <sys/param.h>
36#include <sys/systm.h>
37#include <sys/device.h>
38#include <sys/malloc.h>
39#include <sys/queue.h>
40
41#include <machine/sysconf.h>
42#include <machine/autoconf.h>
43#include <machine/mainboard.h>
44#include <machine/bus.h>
45
46#include <dev/isa/isavar.h>
47#include <dev/isa/isareg.h>
48
49static int	mipscoisabusprint(void *, const char *);
50static int	isabusmatch(device_t, cfdata_t, void *);
51static void	isabusattach(device_t, device_t, void *);
52
53struct isabus_softc {
54	struct mipsco_isa_chipset sc_isa_ic;
55};
56
57CFATTACH_DECL_NEW(isabus, sizeof(struct isabus_softc),
58    isabusmatch, isabusattach, NULL, NULL);
59
60extern struct cfdriver isabus_cd;
61
62static struct mipsco_bus_space	isa_io_bst, isa_mem_bst, isa_ctl_bst;
63static struct mipsco_bus_dma_tag isa_dmatag;
64
65static void isa_bus_space_init(struct mipsco_bus_space *, const char *,
66				     paddr_t, size_t);
67int    isa_intr(void *);
68
69
70int
71isabusmatch(device_t parent, cfdata_t cfp, void *aux)
72{
73	struct confargs *ca = aux;
74
75	if (strcmp(ca->ca_name, isabus_cd.cd_name) != 0)
76		return 0;
77	return 1;
78}
79
80static void
81isa_bus_space_init(struct mipsco_bus_space *bst, const char *type, paddr_t paddr, size_t len)
82{
83	vaddr_t vaddr = MIPS_PHYS_TO_KSEG1(paddr); /* XXX */
84
85	/* Setup default bus_space */
86	mipsco_bus_space_init(bst, type, paddr, vaddr, 0x0, len);
87
88	/* ISA bus maps 1 word for every byte, therefore stride = 2 */
89	mipsco_bus_space_set_aligned_stride(bst, 2);
90
91	/*
92	 * ISA bus will do an automatic byte swap, but when accessing
93	 * memory using bus_space_stream functions we need to byte swap
94	 * to reverse the one performed in hardware
95	 */
96	bst->bs_bswap = 1;
97
98	bst->bs_intr_establish = (void *)isa_intr_establish;
99
100	printf(" %s %p", type, (void *)vaddr);
101}
102
103
104void
105isabusattach(device_t parent, device_t self, void *aux)
106{
107	struct isabus_softc *sc = device_private(self);
108	struct mipsco_isa_chipset *ic = &sc->sc_isa_ic;
109	struct isabus_attach_args iba;
110
111	printf(":");
112
113	iba.iba_iot	= &isa_io_bst;
114	iba.iba_memt	= &isa_mem_bst;
115	iba.iba_dmat	= &isa_dmatag;
116	iba.iba_ic	= ic;
117
118	isa_bus_space_init(&isa_io_bst,  "isa_io",   PIZAZZ_ISA_IOBASE,
119	  	PIZAZZ_ISA_IOSIZE);
120
121	isa_bus_space_init(&isa_mem_bst, "isa_mem",  PIZAZZ_ISA_MEMBASE,
122		PIZAZZ_ISA_MEMSIZE);
123
124	isa_bus_space_init(&isa_ctl_bst, "isa_intr", PIZAZZ_ISA_INTRLATCH,
125	  	sizeof(u_int32_t));
126
127	_bus_dma_tag_init(&isa_dmatag);
128
129	ic->ic_bst = &isa_ctl_bst;
130
131	if (bus_space_map(ic->ic_bst, 0x00000, sizeof(u_int32_t),
132			  BUS_SPACE_MAP_LINEAR, &ic->ic_bsh) != 0) {
133		printf(": can't map intrreg\n");
134		return;
135	}
136
137	/* Clear ISA interrupt latch */
138	bus_space_write_4(ic->ic_bst, ic->ic_bsh, 0, 0);
139
140	evcnt_attach_dynamic(&ic->ic_intrcnt, EVCNT_TYPE_INTR, NULL,
141			     device_xname(self), "intr");
142
143	LIST_INIT(&ic->intr_q);
144	(*platform.intr_establish)(SYS_INTR_ATBUS, isa_intr, ic);
145
146	printf("\n");
147	config_found_ia(self, "isabus", &iba, mipscoisabusprint);
148}
149
150int
151mipscoisabusprint(void *aux, const char *name)
152{
153	if (name == NULL)
154		return UNCONF;
155	return QUIET;
156}
157
158void
159isa_attach_hook(device_t parent, device_t self, struct isabus_attach_args *iba)
160{
161}
162
163void
164isa_detach_hook(isa_chipset_tag_t ic, device_t self)
165{
166}
167
168const struct evcnt *
169isa_intr_evcnt(isa_chipset_tag_t ic, int irq)
170{
171	/* XXX for now, no evcnt parent reported */
172	return NULL;
173}
174
175void *
176isa_intr_establish(isa_chipset_tag_t ic, int intr, int type, int level, int (*ih_fun)(void*), void *ih_arg)
177	/* type:   XXX not yet */
178	/* level:   XXX not yet */
179{
180	struct mipsco_intrhand *ih;
181
182	ih = malloc(sizeof *ih, M_DEVBUF, M_NOWAIT);
183	if (ih == NULL)
184		panic("isa_intr_establish: malloc failed");
185
186	ih->ih_fun = ih_fun;
187	ih->ih_arg  = ih_arg;
188	LIST_INSERT_HEAD(&ic->intr_q, ih, ih_q);
189	return ih;
190}
191
192void
193isa_intr_disestablish(isa_chipset_tag_t ic, void *cookie)
194{
195	struct mipsco_intrhand *ih = cookie;
196
197	LIST_REMOVE(ih, ih_q);
198	free(ih, M_DEVBUF);
199}
200
201int
202isa_intr_alloc(isa_chipset_tag_t ic, int mask, int type, int *irq)
203{
204	return 0;
205}
206
207int
208isa_intr(void *arg)
209{
210	struct mipsco_isa_chipset *ic = (struct mipsco_isa_chipset *)arg;
211	struct mipsco_intrhand *ih;
212	int rv, handled;
213
214	ic->ic_intrcnt.ev_count++;
215
216	handled = 0;
217	LIST_FOREACH(ih, &ic->intr_q, ih_q) {
218		/*
219		 * The handler returns one of three values:
220		 *   0:	This interrupt wasn't for me.
221		 *   1: This interrupt was for me.
222		 *  -1: This interrupt might have been for me, but I can't say
223		 *      for sure.
224		 */
225		rv = (*ih->ih_fun)(ih->ih_arg);
226		handled |= (rv != 0);
227	}
228
229	/* Clear ISA interrupt latch */
230	bus_space_write_4(ic->ic_bst, ic->ic_bsh, 0, 0);
231
232	return handled;
233}
234