1 /* $NetBSD: mfp.c,v 1.32 2024/01/06 05:31:19 isaki Exp $ */
2
3 /*-
4 * Copyright (c) 1998 NetBSD Foundation, Inc.
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 *
16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 /*
30 * MC68901 MFP (multi function periferal) driver for NetBSD/x68k
31 */
32
33 /*
34 * MFP is used as keyboard controller, which may be used before
35 * ordinary initialization.
36 */
37
38 #include <sys/cdefs.h>
39 __KERNEL_RCSID(0, "$NetBSD: mfp.c,v 1.32 2024/01/06 05:31:19 isaki Exp $");
40
41 #include <sys/param.h>
42 #include <sys/systm.h>
43 #include <sys/device.h>
44
45 #include <machine/bus.h>
46 #include <machine/cpu.h>
47 #include <machine/autoconf.h>
48
49 #include <arch/x68k/dev/intiovar.h>
50 #include <arch/x68k/dev/mfp.h>
51
52 static int mfp_match(device_t, cfdata_t, void *);
53 static void mfp_attach(device_t, device_t, void *);
54 static int mfp_search(device_t, cfdata_t, const int *, void *);
55 static void mfp_init(void);
56 static void mfp_calibrate_delay(void);
57
58 CFATTACH_DECL_NEW(mfp, sizeof(struct mfp_softc),
59 mfp_match, mfp_attach, NULL, NULL);
60
61 static int mfp_attached;
62
63 static int
mfp_match(device_t parent,cfdata_t cf,void * aux)64 mfp_match(device_t parent, cfdata_t cf, void *aux)
65 {
66 struct intio_attach_args *ia = aux;
67
68 /* mfp0 */
69 if (strcmp(ia->ia_name, "mfp") != 0)
70 return 0;
71 if (mfp_attached)
72 return (0);
73
74 if (ia->ia_addr == INTIOCF_ADDR_DEFAULT)
75 ia->ia_addr = MFP_ADDR;
76 if (ia->ia_intr == INTIOCF_INTR_DEFAULT)
77 ia->ia_addr = MFP_INTR;
78
79 /* fixed address */
80 if (ia->ia_addr != MFP_ADDR)
81 return (0);
82 if (ia->ia_intr != MFP_INTR)
83 return (0);
84
85 return (1);
86 }
87
88
89 static void
mfp_attach(device_t parent,device_t self,void * aux)90 mfp_attach(device_t parent, device_t self, void *aux)
91 {
92 struct mfp_softc *sc = device_private(self);
93 struct intio_attach_args *ia = aux;
94 int r __diagused;
95
96 aprint_normal("\n");
97 mfp_attached = 1;
98
99 /* mfp_init() is already called via early config_console() */
100 sc->sc_bst = ia->ia_bst;
101 sc->sc_intr = ia->ia_intr;
102 ia->ia_size = 0x30;
103 r = intio_map_allocate_region(parent, ia, INTIO_MAP_ALLOCATE);
104 #ifdef DIAGNOSTIC
105 if (r)
106 panic("IO map for MFP corruption??");
107 #endif
108 bus_space_map(ia->ia_bst, ia->ia_addr, 0x2000, 0, &sc->sc_bht);
109 config_search(self, NULL,
110 CFARGS(.search = mfp_search));
111 }
112
113 static int
mfp_search(device_t parent,cfdata_t cf,const int * loc,void * aux)114 mfp_search(device_t parent, cfdata_t cf, const int *loc, void *aux)
115 {
116 if (config_probe(parent, cf, __UNCONST(cf->cf_name)))
117 config_attach(parent, cf, __UNCONST(cf->cf_name), NULL,
118 CFARGS_NONE);
119 return 0;
120 }
121
122 void
mfp_config_console(void)123 mfp_config_console(void)
124 {
125 mfp_init();
126 mfp_calibrate_delay();
127 }
128
129 static void
mfp_init(void)130 mfp_init(void)
131 {
132 mfp_set_vr(MFP_INTR);
133
134 /* stop all interrupts */
135 mfp_set_iera(0);
136 mfp_set_ierb(0);
137
138 /* make MSCTRL 'High', XXX where should I do it? */
139 mfp_send_usart(0x41);
140
141 /* Timer A settings */
142 mfp_set_tacr(MFP_TIMERA_RESET | MFP_TIMERA_STOP);
143
144 /* Timer B settings: used for USART clock */
145 mfp_set_tbcr(MFP_TIMERB_RESET | MFP_TIMERB_STOP);
146
147 /* Timer C/D settings */
148 mfp_set_tcdcr(0);
149 }
150
151 extern int delay_divisor;
152
153 static void
mfp_calibrate_delay(void)154 mfp_calibrate_delay(void)
155 {
156 /*
157 * Stolen from mvme68k.
158 */
159 /*
160 * X68k provides 4MHz clock (= 0.25usec) for MFP timer C.
161 * 10000usec = 0.25usec * 200 * 200
162 * Our slowest clock is 20MHz (?). Its delay_divisor value
163 * should be about 102. Start from 140 here.
164 */
165 for (delay_divisor = 140; delay_divisor > 0; delay_divisor--) {
166 mfp_set_tcdr(255-0);
167 mfp_set_tcdcr(0x70); /* 1/200 delay mode */
168 _delay(10000);
169 mfp_set_tcdcr(0); /* stop timer */
170 if ((255 - mfp_get_tcdr()) > 200)
171 break; /* got it! */
172 /* retry! */
173 }
174 }
175
176 /*
177 * MFP utility functions
178 */
179
180 /*
181 * wait for built-in display hsync.
182 * should be called before writing to frame buffer.
183 * might be called before realconfig.
184 */
185 void
mfp_wait_for_hsync(void)186 mfp_wait_for_hsync(void)
187 {
188 /* wait for CRT HSYNC */
189 while (mfp_get_gpip() & MFP_GPIP_HSYNC)
190 __asm("nop");
191 while (!(mfp_get_gpip() & MFP_GPIP_HSYNC))
192 __asm("nop");
193 }
194
195 /*
196 * send COMMAND to the MFP USART.
197 * USART is attached to the keyboard.
198 * might be called before realconfig.
199 */
200 int
mfp_send_usart(int command)201 mfp_send_usart(int command)
202 {
203 while (!(mfp_get_tsr() & MFP_TSR_BE));
204 mfp_set_udr(command);
205
206 return 0;
207 }
208
209 int
mfp_receive_usart(void)210 mfp_receive_usart(void)
211 {
212 while (!(mfp_get_rsr() & MFP_RSR_BF))
213 __asm("nop");
214 return mfp_get_udr();
215 }
216