ppb_base.c revision 119418 
1/*-
2 * Copyright (c) 1997, 1998, 1999 Nicolas Souchu
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: head/sys/dev/ppbus/ppb_base.c 119418 2003-08-24 17:55:58Z obrien $");
29
30#include <sys/param.h>
31#include <sys/systm.h>
32#include <sys/kernel.h>
33#include <sys/module.h>
34#include <sys/bus.h>
35
36#include <dev/ppbus/ppbconf.h>
37
38#include "ppbus_if.h"
39
40#include <dev/ppbus/ppbio.h>
41
42MODULE_VERSION(ppbus, 1);
43
44#define DEVTOSOFTC(dev) ((struct ppb_data *)device_get_softc(dev))
45
46/*
47 * ppb_poll_bus()
48 *
49 * Polls the bus
50 *
51 * max is a delay in 10-milliseconds
52 */
53int
54ppb_poll_bus(device_t bus, int max,
55	     char mask, char status, int how)
56{
57	int i, j, error;
58	char r;
59
60	/* try at least up to 10ms */
61	for (j = 0; j < ((how & PPB_POLL) ? max : 1); j++) {
62		for (i = 0; i < 10000; i++) {
63			r = ppb_rstr(bus);
64			DELAY(1);
65			if ((r & mask) == status)
66				return (0);
67		}
68	}
69
70	if (!(how & PPB_POLL)) {
71	   for (i = 0; max == PPB_FOREVER || i < max-1; i++) {
72		if ((ppb_rstr(bus) & mask) == status)
73			return (0);
74
75		switch (how) {
76		case PPB_NOINTR:
77			/* wait 10 ms */
78			tsleep((caddr_t)bus, PPBPRI, "ppbpoll", hz/100);
79			break;
80
81		case PPB_INTR:
82		default:
83			/* wait 10 ms */
84			if (((error = tsleep((caddr_t)bus, PPBPRI | PCATCH,
85			    "ppbpoll", hz/100)) != EWOULDBLOCK) != 0) {
86				return (error);
87			}
88			break;
89		}
90	   }
91	}
92
93	return (EWOULDBLOCK);
94}
95
96/*
97 * ppb_get_epp_protocol()
98 *
99 * Return the chipset EPP protocol
100 */
101int
102ppb_get_epp_protocol(device_t bus)
103{
104	uintptr_t protocol;
105
106	BUS_READ_IVAR(device_get_parent(bus), bus, PPC_IVAR_EPP_PROTO, &protocol);
107
108	return (protocol);
109}
110
111/*
112 * ppb_get_mode()
113 *
114 */
115int
116ppb_get_mode(device_t bus)
117{
118	struct ppb_data *ppb = DEVTOSOFTC(bus);
119
120	/* XXX yet device mode = ppbus mode = chipset mode */
121	return (ppb->mode);
122}
123
124/*
125 * ppb_set_mode()
126 *
127 * Set the operating mode of the chipset, return the previous mode
128 */
129int
130ppb_set_mode(device_t bus, int mode)
131{
132	struct ppb_data *ppb = DEVTOSOFTC(bus);
133	int old_mode = ppb_get_mode(bus);
134
135	if (PPBUS_SETMODE(device_get_parent(bus), mode))
136		return -1;
137
138	/* XXX yet device mode = ppbus mode = chipset mode */
139	ppb->mode = (mode & PPB_MASK);
140
141	return (old_mode);
142}
143
144/*
145 * ppb_write()
146 *
147 * Write charaters to the port
148 */
149int
150ppb_write(device_t bus, char *buf, int len, int how)
151{
152	return (PPBUS_WRITE(device_get_parent(bus), buf, len, how));
153}
154
155/*
156 * ppb_reset_epp_timeout()
157 *
158 * Reset the EPP timeout bit in the status register
159 */
160int
161ppb_reset_epp_timeout(device_t bus)
162{
163	return(PPBUS_RESET_EPP(device_get_parent(bus)));
164}
165
166/*
167 * ppb_ecp_sync()
168 *
169 * Wait for the ECP FIFO to be empty
170 */
171int
172ppb_ecp_sync(device_t bus)
173{
174	return (PPBUS_ECP_SYNC(device_get_parent(bus)));
175}
176
177/*
178 * ppb_get_status()
179 *
180 * Read the status register and update the status info
181 */
182int
183ppb_get_status(device_t bus, struct ppb_status *status)
184{
185	register char r;
186
187	r = status->status = ppb_rstr(bus);
188
189	status->timeout	= r & TIMEOUT;
190	status->error	= !(r & nFAULT);
191	status->select	= r & SELECT;
192	status->paper_end = r & PERROR;
193	status->ack	= !(r & nACK);
194	status->busy	= !(r & nBUSY);
195
196	return (0);
197}
198