gt.c revision 1.11 
1/*	$NetBSD: gt.c,v 1.11 2004/08/28 13:33:31 tsutsui Exp $	*/
2
3/*
4 * Copyright (c) 2000 Soren S. Jorvang.  All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions, and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28#include <sys/cdefs.h>
29__KERNEL_RCSID(0, "$NetBSD: gt.c,v 1.11 2004/08/28 13:33:31 tsutsui Exp $");
30
31#include <sys/param.h>
32#include <sys/systm.h>
33#include <sys/ioctl.h>
34#include <sys/select.h>
35#include <sys/tty.h>
36#include <sys/proc.h>
37#include <sys/user.h>
38#include <sys/conf.h>
39#include <sys/file.h>
40#include <sys/uio.h>
41#include <sys/kernel.h>
42#include <sys/syslog.h>
43#include <sys/types.h>
44#include <sys/device.h>
45
46#include <machine/autoconf.h>
47#include <machine/bus.h>
48#include <machine/intr.h>
49
50#include <dev/pci/pcivar.h>
51
52#include <cobalt/cobalt/clockvar.h>
53#include <cobalt/dev/gtreg.h>
54
55#include "pci.h"
56
57struct gt_softc {
58	struct device	sc_dev;
59
60	bus_space_tag_t sc_bst;
61	bus_space_handle_t sc_bsh;
62	struct cobalt_pci_chipset sc_pc;
63};
64
65static int	gt_match(struct device *, struct cfdata *, void *);
66static void	gt_attach(struct device *, struct device *, void *);
67static int	gt_print(void *aux, const char *pnp);
68
69static void	gt_timer_init(struct gt_softc *sc);
70static void	gt_timer0_init(void *);
71static long	gt_timer0_read(void *);
72
73CFATTACH_DECL(gt, sizeof(struct gt_softc),
74    gt_match, gt_attach, NULL, NULL);
75
76static int
77gt_match(parent, match, aux)
78	struct device *parent;
79	struct cfdata *match;
80	void *aux;
81{
82	return 1;
83}
84
85#define GT_REG_REGION	0x1000
86
87static void
88gt_attach(parent, self, aux)
89	struct device *parent;
90	struct device *self;
91	void *aux;
92{
93	struct mainbus_attach_args *ma = aux;
94	struct gt_softc *sc = (void *)self;
95#if NPCI > 0
96	pci_chipset_tag_t pc;
97	struct pcibus_attach_args pba;
98#endif
99
100	sc->sc_bst = ma->ma_iot;
101	if (bus_space_map(sc->sc_bst, ma->ma_addr, GT_REG_REGION,
102	    0, &sc->sc_bsh)) {
103		printf(": unable to map GT64111 registers\n");
104		return;
105	}
106
107	printf("\n");
108
109	gt_timer_init(sc);
110
111	bus_space_write_4(sc->sc_bst, sc->sc_bsh, GT_PCI_COMMAND,
112	    (bus_space_read_4(sc->sc_bst, sc->sc_bsh, GT_PCI_COMMAND) &
113	    ~PCI_SYNCMODE) | PCI_PCLK_HIGH);
114
115#if NPCI > 0
116	pc = &sc->sc_pc;
117	pc->pc_bst = sc->sc_bst;
118	pc->pc_bsh = sc->sc_bsh;
119
120	pba.pba_busname = "pci";
121	pba.pba_dmat = &pci_bus_dma_tag;
122	pba.pba_dmat64 = NULL;
123	pba.pba_flags = PCI_FLAGS_IO_ENABLED | PCI_FLAGS_MEM_ENABLED;
124	pba.pba_bus = 0;
125	pba.pba_bridgetag = NULL;
126	pba.pba_flags = PCI_FLAGS_IO_ENABLED | PCI_FLAGS_MEM_ENABLED |
127		PCI_FLAGS_MRL_OKAY | /*PCI_FLAGS_MRM_OKAY|*/ PCI_FLAGS_MWI_OKAY;
128	pba.pba_pc = pc;
129	config_found(self, &pba, gt_print);
130#endif
131}
132
133static int
134gt_print(aux, pnp)
135	void *aux;
136	const char *pnp;
137{
138	/* XXX */
139	return 0;
140}
141
142static void
143gt_timer_init(struct gt_softc *sc)
144{
145
146	/* stop timer0 */
147	bus_space_write_4(sc->sc_bst, sc->sc_bsh, GT_TIMER_CTRL,
148	    bus_space_read_4(sc->sc_bst, sc->sc_bsh, GT_TIMER_CTRL) & ~ENTC0);
149
150	timer_start = gt_timer0_init;
151	timer_read  = gt_timer0_read;
152	timer_cookie = sc;
153}
154
155#define TIMER0_INIT_VALUE 500000
156
157static void
158gt_timer0_init(void *cookie)
159{
160	struct gt_softc *sc = cookie;
161
162	bus_space_write_4(sc->sc_bst, sc->sc_bsh,
163	    GT_TIMER_COUNTER0, TIMER0_INIT_VALUE);
164	/* start timer0 */
165	bus_space_write_4(sc->sc_bst, sc->sc_bsh, GT_TIMER_CTRL,
166	    bus_space_read_4(sc->sc_bst, sc->sc_bsh, GT_TIMER_CTRL) | ENTC0);
167}
168
169static long
170gt_timer0_read(void *cookie)
171{
172	struct gt_softc *sc = cookie;
173	uint32_t counter0;
174
175	counter0 = bus_space_read_4(sc->sc_bst, sc->sc_bsh, GT_TIMER_COUNTER0);
176	counter0 = TIMER0_INIT_VALUE - counter0;
177#if 0
178	counter /= 50;
179#else
180	/*
181	 * From pmax/pmax/dec_3min.c:
182	 * 1/64 + 1/256 + 1/2048 = 41/2048 = 1/49.9512...
183	 */
184	counter0 = (counter0 >> 6) + (counter0 >> 8) + (counter0 >> 11);
185#endif
186	return counter0;
187}
188