Annotation of sys/arch/solbourne/dev/zsclock.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: zsclock.c,v 1.2 2005/04/20 01:43:51 miod Exp $ */
2: /* $NetBSD: clock.c,v 1.11 1995/05/16 07:30:46 phil Exp $ */
3:
4: /*-
5: * Copyright (c) 1990 The Regents of the University of California.
6: * All rights reserved.
7: *
8: * This code is derived from software contributed to Berkeley by
9: * William Jolitz and Don Ahn.
10: *
11: * Redistribution and use in source and binary forms, with or without
12: * modification, are permitted provided that the following conditions
13: * are met:
14: * 1. Redistributions of source code must retain the above copyright
15: * notice, this list of conditions and the following disclaimer.
16: * 2. Redistributions in binary form must reproduce the above copyright
17: * notice, this list of conditions and the following disclaimer in the
18: * documentation and/or other materials provided with the distribution.
19: * 3. All advertising materials mentioning features or use of this software
20: * must display the following acknowledgement:
21: * This product includes software developed by the University of
22: * California, Berkeley and its contributors.
23: * 4. Neither the name of the University nor the names of its contributors
24: * may be used to endorse or promote products derived from this software
25: * without specific prior written permission.
26: *
27: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37: * SUCH DAMAGE.
38: *
39: * @(#)clock.c 7.2 (Berkeley) 5/12/91
40: *
41: */
42:
43: /*
44: * Primitive clock interrupt routines.
45: *
46: * Improved by Phil Budne ... 10/17/94.
47: * Pulled over code from i386/isa/clock.c (Matthias Pfaller 12/03/94).
48: */
49:
50: #include <sys/param.h>
51: #include <sys/time.h>
52: #include <sys/kernel.h>
53: #include <sys/systm.h>
54: #include <sys/proc.h>
55: #include <sys/device.h>
56: #include <sys/conf.h>
57: #include <sys/ioctl.h>
58: #include <sys/kernel.h>
59:
60: #include <sparc/dev/z8530reg.h>
61: #include <machine/z8530var.h>
62:
63: #include <machine/autoconf.h>
64: #include <machine/cpu.h>
65:
66: /*
67: * Zilog Z8530 Dual UART driver (clock interface)
68: */
69:
70: /* Clock state. */
71: struct zsclock_softc {
72: struct device zsc_dev;
73: struct zs_chanstate *zsc_cs;
74: };
75:
76: int zsclock_match(struct device *, void *, void *);
77: void zsclock_attach(struct device *, struct device *, void *);
78:
79: struct cfattach zsclock_ca = {
80: sizeof(struct zsclock_softc), zsclock_match, zsclock_attach
81: };
82:
83: struct cfdriver zsclock_cd = {
84: NULL, "zsclock", DV_DULL
85: };
86:
87: void zsclock_stint(struct zs_chanstate *, int);
88:
89: struct zsops zsops_clock = {
90: NULL,
91: zsclock_stint,
92: NULL,
93: NULL
94: };
95:
96: static int zsclock_attached;
97:
98: /*
99: * clock_match: how is this zs channel configured?
100: */
101: int
102: zsclock_match(struct device *parent, void *match, void *aux)
103: {
104: struct cfdata *cf = match;
105: struct zsc_attach_args *args = aux;
106:
107: /* only attach one instance */
108: if (zsclock_attached)
109: return (0);
110:
111: /* make sure we'll win a probe over zstty or zskbd */
112: if (cf->cf_loc[ZSCCF_CHANNEL] == args->channel)
113: return (2 + 2);
114:
115: if (cf->cf_loc[ZSCCF_CHANNEL] == ZSCCF_CHANNEL_DEFAULT)
116: return (2 + 1);
117:
118: return (0);
119: }
120:
121: /*
122: * The Solbourne IDT systems provide a 4.9152 MHz clock to the ZS chips.
123: */
124: #define PCLK (9600 * 512) /* PCLK pin input clock rate */
125:
126: void
127: zsclock_attach(struct device *parent, struct device *self, void *aux)
128: {
129: struct zsc_softc *zsc = (void *)parent;
130: struct zsclock_softc *sc = (void *)self;
131: struct zsc_attach_args *args = aux;
132: struct zs_chanstate *cs;
133: int channel;
134: int reset, s, tconst;
135:
136: channel = args->channel;
137:
138: cs = &zsc->zsc_cs[channel];
139: cs->cs_private = zsc;
140: cs->cs_ops = &zsops_clock;
141:
142: sc->zsc_cs = cs;
143:
144: printf("\n");
145:
146: hz = 100;
147: tconst = ((PCLK / 2) / hz) - 2;
148:
149: s = splclock();
150:
151: reset = (channel == 0) ? ZSWR9_A_RESET : ZSWR9_B_RESET;
152: zs_write_reg(cs, 9, reset);
153:
154: cs->cs_preg[1] = 0;
155: cs->cs_preg[3] = ZSWR3_RX_8 | ZSWR3_RX_ENABLE;
156: cs->cs_preg[4] = ZSWR4_CLK_X1 | ZSWR4_ONESB | ZSWR4_PARENB;
157: cs->cs_preg[5] = ZSWR5_TX_8 | ZSWR5_TX_ENABLE;
158: cs->cs_preg[9] = ZSWR9_MASTER_IE;
159: cs->cs_preg[10] = 0;
160: cs->cs_preg[11] = ZSWR11_RXCLK_RTXC | ZSWR11_TXCLK_RTXC |
161: ZSWR11_TRXC_OUT_ENA | ZSWR11_TRXC_BAUD;
162: cs->cs_preg[12] = tconst;
163: cs->cs_preg[13] = tconst >> 8;
164: cs->cs_preg[14] = ZSWR14_BAUD_FROM_PCLK | ZSWR14_BAUD_ENA;
165: cs->cs_preg[15] = ZSWR15_ZERO_COUNT_IE;
166:
167: zs_loadchannelregs(cs);
168:
169: splx(s);
170:
171: /* enable interrupts */
172: cs->cs_preg[1] |= ZSWR1_SIE;
173: zs_write_reg(cs, 1, cs->cs_preg[1]);
174:
175: zsclock_attached = 1;
176: }
177:
178: void
179: zsclock_stint(struct zs_chanstate *cs, int force)
180: {
181: u_char rr0;
182:
183: rr0 = zs_read_csr(cs);
184: cs->cs_rr0 = rr0;
185:
186: /*
187: * Retrigger the interrupt as a soft interrupt, because we need
188: * a trap frame for hardclock().
189: */
190: ienab_bis(IE_L10);
191:
192: zs_write_csr(cs, ZSWR0_RESET_STATUS);
193: }
CVSweb
![[BACK]](/icons/back.gif){kind=icon}
Return to zsclock.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / sys / arch / solbourne / dev