1/*	$NetBSD: sram.c,v 1.17 2008/12/14 02:16:51 isaki Exp $	*/
2
3/*
4 * Copyright (c) 1994 Kazuhisa Shimizu.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 *    must display the following acknowledgement:
17 *      This product includes software developed by Kazuhisa Shimizu.
18 * 4. The name of the author may not be used to endorse or promote products
19 *    derived from this software without specific prior written permission
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33#include <sys/cdefs.h>
34__KERNEL_RCSID(0, "$NetBSD: sram.c,v 1.17 2008/12/14 02:16:51 isaki Exp $");
35
36#include <sys/param.h>
37#include <sys/systm.h>
38#include <sys/proc.h>
39#include <sys/ioctl.h>
40#include <sys/file.h>
41#include <sys/conf.h>
42#include <sys/bus.h>
43#include <sys/device.h>
44
45#include <machine/sram.h>
46#include <x68k/dev/intiovar.h>
47#include <x68k/dev/sramvar.h>
48
49#define SRAM_ADDR	(0xed0000)
50
51#ifdef DEBUG
52#define SRAM_DEBUG_OPEN		0x01
53#define SRAM_DEBUG_CLOSE	0x02
54#define SRAM_DEBUG_IOCTL	0x04
55#define SRAM_DEBUG_DONTDOIT	0x08
56int sramdebug = SRAM_DEBUG_IOCTL;
57#define DPRINTF(flag, msg)	do {	\
58	if ((sramdebug & (flag)))	\
59		printf msg;		\
60} while (0)
61#else
62#define DPRINTF(flag, msg)	/* nothing */
63#endif
64
65int  srammatch(device_t, cfdata_t, void *);
66void sramattach(device_t, device_t, void *);
67
68extern struct cfdriver sram_cd;
69
70dev_type_open(sramopen);
71dev_type_close(sramclose);
72dev_type_ioctl(sramioctl);
73
74CFATTACH_DECL_NEW(sram, sizeof(struct sram_softc),
75	srammatch, sramattach, NULL, NULL);
76
77const struct cdevsw sram_cdevsw = {
78	sramopen, sramclose, noread, nowrite, sramioctl,
79	nostop, notty, nopoll, nommap, nokqfilter,
80};
81
82static int sram_attached;
83
84/*
85 *  functions for probeing.
86 */
87int
88srammatch(device_t parent, cfdata_t cf, void *aux)
89{
90	struct intio_attach_args *ia = aux;
91
92	if (sram_attached)
93		return 0;
94
95	if (ia->ia_addr == INTIOCF_ADDR_DEFAULT)
96		ia->ia_addr = SRAM_ADDR;
97
98	/* Fixed parameter */
99	if (ia->ia_addr != SRAM_ADDR)
100		return 0;
101
102	return 1;
103}
104
105void
106sramattach(device_t parent, device_t self, void *aux)
107{
108	struct sram_softc *sc = device_private(self);
109	struct intio_attach_args *ia = aux;
110	bus_space_tag_t iot;
111	bus_space_handle_t ioh;
112
113	/* Map I/O space */
114	iot = ia->ia_bst;
115	if (bus_space_map(iot, ia->ia_addr, SRAM_SIZE, 0, &ioh))
116		goto out;
117
118	/* Initialize sc */
119	sc->sc_iot = iot;
120	sc->sc_ioh = ioh;
121
122	sc->sc_flags = 0;
123	aprint_normal(": 16k bytes accessible\n");
124	sram_attached = 1;
125	return;
126
127 out:
128	aprint_normal(": not accessible\n");
129}
130
131
132/*ARGSUSED*/
133int
134sramopen(dev_t dev, int flags, int mode, struct lwp *l)
135{
136	struct sram_softc *sc;
137
138	DPRINTF(SRAM_DEBUG_OPEN, ("Sram open\n"));
139
140	sc = device_lookup_private(&sram_cd, minor(dev));
141	if (sc == NULL)
142		return ENXIO;
143
144	if (sc->sc_flags & SRF_OPEN)
145		return EBUSY;
146
147	sc->sc_flags |= SRF_OPEN;
148	if (flags & FREAD)
149		sc->sc_flags |= SRF_READ;
150	if (flags & FWRITE)
151		sc->sc_flags |= SRF_WRITE;
152
153	return 0;
154}
155
156/*ARGSUSED*/
157int
158sramclose(dev_t dev, int flags, int mode, struct lwp *l)
159{
160	struct sram_softc *sc;
161
162	DPRINTF(SRAM_DEBUG_CLOSE, ("Sram close\n"));
163
164	sc = device_lookup_private(&sram_cd, minor(dev));
165	if (sc == NULL)
166		return ENXIO;
167
168	if (sc->sc_flags & SRF_OPEN) {
169		sc->sc_flags = 0;
170	}
171	sc->sc_flags &= ~(SRF_READ|SRF_WRITE);
172
173	return 0;
174}
175
176/*ARGSUSED*/
177int
178sramioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
179{
180	int error = 0;
181	struct sram_io *sram_io;
182	struct sram_softc *sc;
183
184	DPRINTF(SRAM_DEBUG_IOCTL, ("Sram ioctl cmd=%lx\n", cmd));
185
186	sc = device_lookup_private(&sram_cd, minor(dev));
187	if (sc == NULL)
188		return ENXIO;
189
190	sram_io = (struct sram_io *)data;
191	if (sram_io == NULL)
192		return EFAULT;
193
194	switch (cmd) {
195	case SIOGSRAM:
196		if ((sc->sc_flags & SRF_READ) == 0)
197			return EPERM;
198		DPRINTF(SRAM_DEBUG_IOCTL,
199			("Sram ioctl SIOGSRAM address=%p\n", data));
200		DPRINTF(SRAM_DEBUG_IOCTL,
201			("Sram ioctl SIOGSRAM offset=%x\n", sram_io->offset));
202		if (sram_io->offset + SRAM_IO_SIZE > SRAM_SIZE)
203			return EFAULT;
204		bus_space_read_region_1(sc->sc_iot, sc->sc_ioh, sram_io->offset,
205			(uint8_t *)&sram_io->sram, SRAM_IO_SIZE);
206		break;
207	case SIOPSRAM:
208		if ((sc->sc_flags & SRF_WRITE) == 0)
209			return EPERM;
210		DPRINTF(SRAM_DEBUG_IOCTL,
211    			("Sram ioctl SIOPSRAM address=%p\n", data));
212		DPRINTF(SRAM_DEBUG_IOCTL,
213    			("Sram ioctl SIOPSRAM offset=%x\n", sram_io->offset));
214		if (sram_io->offset + SRAM_IO_SIZE > SRAM_SIZE)
215			return EFAULT;
216#ifdef DEBUG
217		if (sramdebug & SRAM_DEBUG_DONTDOIT) {
218			printf("Sram ioctl SIOPSRAM: skipping actual write\n");
219			break;
220		}
221#endif
222		intio_set_sysport_sramwp(0x31);
223		bus_space_write_region_1(sc->sc_iot, sc->sc_ioh,
224			sram_io->offset, (uint8_t *)&sram_io->sram,
225			SRAM_IO_SIZE);
226		intio_set_sysport_sramwp(0x00);
227		break;
228	default:
229		error = EINVAL;
230		break;
231	}
232	return error;
233}
234