mfp.c revision 1.29
1 /* $NetBSD: mfp.c,v 1.29 2021/08/07 16:19:07 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 1.29 2021/08/07 16:19:07 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 CFARGS(.search = mfp_search)); 112 } 113 114 static int 115 mfp_search(device_t parent, cfdata_t cf, const int *loc, void *aux) 116 { 117 if (config_probe(parent, cf, __UNCONST(cf->cf_name))) 118 config_attach(parent, cf, __UNCONST(cf->cf_name), NULL, 119 CFARGS_NONE); 120 return 0; 121 } 122 123 void 124 mfp_config_console(void) 125 { 126 mfp_init(); 127 mfp_calibrate_delay(); 128 } 129 130 static void 131 mfp_init(void) 132 { 133 mfp_set_vr(MFP_INTR); 134 135 /* stop all interrupts */ 136 mfp_set_iera(0); 137 mfp_set_ierb(0); 138 139 /* make MSCTRL 'High', XXX where should I do it? */ 140 mfp_send_usart(0x41); 141 142 /* Timer A settings */ 143 mfp_set_tacr(MFP_TIMERA_RESET | MFP_TIMERA_STOP); 144 145 /* Timer B settings: used for USART clock */ 146 mfp_set_tbcr(MFP_TIMERB_RESET | MFP_TIMERB_STOP); 147 148 /* Timer C/D settings */ 149 mfp_set_tcdcr(0); 150 } 151 152 extern int delay_divisor; 153 void _delay(u_int); 154 155 static void 156 mfp_calibrate_delay(void) 157 { 158 /* 159 * Stolen from mvme68k. 160 */ 161 /* 162 * X68k provides 4MHz clock (= 0.25usec) for MFP timer C. 163 * 10000usec = 0.25usec * 200 * 200 164 * Our slowest clock is 20MHz (?). Its delay_divisor value 165 * should be about 102. Start from 140 here. 166 */ 167 for (delay_divisor = 140; delay_divisor > 0; delay_divisor--) { 168 mfp_set_tcdr(255-0); 169 mfp_set_tcdcr(0x70); /* 1/200 delay mode */ 170 _delay(10000 << 8); 171 mfp_set_tcdcr(0); /* stop timer */ 172 if ((255 - mfp_get_tcdr()) > 200) 173 break; /* got it! */ 174 /* retry! */ 175 } 176 } 177 178 /* 179 * MFP utility functions 180 */ 181 182 /* 183 * wait for built-in display hsync. 184 * should be called before writing to frame buffer. 185 * might be called before realconfig. 186 */ 187 void 188 mfp_wait_for_hsync(void) 189 { 190 /* wait for CRT HSYNC */ 191 while (mfp_get_gpip() & MFP_GPIP_HSYNC) 192 __asm("nop"); 193 while (!(mfp_get_gpip() & MFP_GPIP_HSYNC)) 194 __asm("nop"); 195 } 196 197 /* 198 * send COMMAND to the MFP USART. 199 * USART is attached to the keyboard. 200 * might be called before realconfig. 201 */ 202 int 203 mfp_send_usart(int command) 204 { 205 while (!(mfp_get_tsr() & MFP_TSR_BE)); 206 mfp_set_udr(command); 207 208 return 0; 209 } 210 211 int 212 mfp_receive_usart(void) 213 { 214 while (!(mfp_get_rsr() & MFP_RSR_BF)) 215 __asm("nop"); 216 return mfp_get_udr(); 217 } 218
Indexes created Fri Sep 26 08:10:20 GMT 2025