mfp.c revision 1.28
1 /* $NetBSD: mfp.c,v 1.28 2021/04/24 23:36:51 thorpej 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 1.28 2021/04/24 23:36:51 thorpej Exp $"); 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/device.h> 44 #include <sys/malloc.h> 45 46 #include <machine/bus.h> 47 #include <machine/cpu.h> 48 #include <machine/autoconf.h> 49 50 #include <arch/x68k/dev/intiovar.h> 51 #include <arch/x68k/dev/mfp.h> 52 53 static int mfp_match(device_t, cfdata_t, void *); 54 static void mfp_attach(device_t, device_t, void *); 55 static int mfp_search(device_t, cfdata_t, const int *, void *); 56 static void mfp_init(void); 57 static void mfp_calibrate_delay(void); 58 59 CFATTACH_DECL_NEW(mfp, sizeof(struct mfp_softc), 60 mfp_match, mfp_attach, NULL, NULL); 61 62 static int mfp_attached; 63 64 static int 65 mfp_match(device_t parent, cfdata_t cf, void *aux) 66 { 67 struct intio_attach_args *ia = aux; 68 69 /* mfp0 */ 70 if (strcmp(ia->ia_name, "mfp") != 0) 71 return 0; 72 if (mfp_attached) 73 return (0); 74 75 if (ia->ia_addr == INTIOCF_ADDR_DEFAULT) 76 ia->ia_addr = MFP_ADDR; 77 if (ia->ia_intr == INTIOCF_INTR_DEFAULT) 78 ia->ia_addr = MFP_INTR; 79 80 /* fixed address */ 81 if (ia->ia_addr != MFP_ADDR) 82 return (0); 83 if (ia->ia_intr != MFP_INTR) 84 return (0); 85 86 return (1); 87 } 88 89 90 static void 91 mfp_attach(device_t parent, device_t self, void *aux) 92 { 93 struct mfp_softc *sc = device_private(self); 94 struct intio_attach_args *ia = aux; 95 int r __diagused; 96 97 aprint_normal("\n"); 98 mfp_attached = 1; 99 100 /* mfp_init() is already called via early config_console() */ 101 sc->sc_bst = ia->ia_bst; 102 sc->sc_intr = ia->ia_intr; 103 ia->ia_size = 0x30; 104 r = intio_map_allocate_region(parent, ia, INTIO_MAP_ALLOCATE); 105 #ifdef DIAGNOSTIC 106 if (r) 107 panic("IO map for MFP corruption??"); 108 #endif 109 bus_space_map(ia->ia_bst, ia->ia_addr, 0x2000, 0, &sc->sc_bht); 110 config_search(self, NULL, 111 CFARG_SEARCH, mfp_search, 112 CFARG_EOL); 113 } 114 115 static int 116 mfp_search(device_t parent, cfdata_t cf, const int *loc, void *aux) 117 { 118 if (config_probe(parent, cf, __UNCONST(cf->cf_name))) 119 config_attach(parent, cf, __UNCONST(cf->cf_name), NULL, 120 CFARG_EOL); 121 return 0; 122 } 123 124 void 125 mfp_config_console(void) 126 { 127 mfp_init(); 128 mfp_calibrate_delay(); 129 } 130 131 static void 132 mfp_init(void) 133 { 134 mfp_set_vr(MFP_INTR); 135 136 /* stop all interrupts */ 137 mfp_set_iera(0); 138 mfp_set_ierb(0); 139 140 /* make MSCTRL 'High', XXX where should I do it? */ 141 mfp_send_usart(0x41); 142 143 /* Timer A settings */ 144 mfp_set_tacr(MFP_TIMERA_RESET | MFP_TIMERA_STOP); 145 146 /* Timer B settings: used for USART clock */ 147 mfp_set_tbcr(MFP_TIMERB_RESET | MFP_TIMERB_STOP); 148 149 /* Timer C/D settings */ 150 mfp_set_tcdcr(0); 151 } 152 153 extern int delay_divisor; 154 void _delay(u_int); 155 156 static void 157 mfp_calibrate_delay(void) 158 { 159 /* 160 * Stolen from mvme68k. 161 */ 162 /* 163 * X68k provides 4MHz clock (= 0.25usec) for MFP timer C. 164 * 10000usec = 0.25usec * 200 * 200 165 * Our slowest clock is 20MHz (?). Its delay_divisor value 166 * should be about 102. Start from 140 here. 167 */ 168 for (delay_divisor = 140; delay_divisor > 0; delay_divisor--) { 169 mfp_set_tcdr(255-0); 170 mfp_set_tcdcr(0x70); /* 1/200 delay mode */ 171 _delay(10000 << 8); 172 mfp_set_tcdcr(0); /* stop timer */ 173 if ((255 - mfp_get_tcdr()) > 200) 174 break; /* got it! */ 175 /* retry! */ 176 } 177 } 178 179 /* 180 * MFP utility functions 181 */ 182 183 /* 184 * wait for built-in display hsync. 185 * should be called before writing to frame buffer. 186 * might be called before realconfig. 187 */ 188 void 189 mfp_wait_for_hsync(void) 190 { 191 /* wait for CRT HSYNC */ 192 while (mfp_get_gpip() & MFP_GPIP_HSYNC) 193 __asm("nop"); 194 while (!(mfp_get_gpip() & MFP_GPIP_HSYNC)) 195 __asm("nop"); 196 } 197 198 /* 199 * send COMMAND to the MFP USART. 200 * USART is attached to the keyboard. 201 * might be called before realconfig. 202 */ 203 int 204 mfp_send_usart(int command) 205 { 206 while (!(mfp_get_tsr() & MFP_TSR_BE)); 207 mfp_set_udr(command); 208 209 return 0; 210 } 211 212 int 213 mfp_receive_usart(void) 214 { 215 while (!(mfp_get_rsr() & MFP_RSR_BF)) 216 __asm("nop"); 217 return mfp_get_udr(); 218 } 219
Indexes created Fri Sep 26 08:10:20 GMT 2025