1 /* $NetBSD: mfp.c,v 1.9 2002/10/02 16:02:41 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 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the NetBSD 18 * Foundation, Inc. and its contributors. 19 * 4. The name of the author may not be used to endorse or promote products 20 * derived from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 24 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 25 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 26 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 32 * POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35 /* 36 * MC68901 MFP (multi function periferal) driver for NetBSD/x68k 37 */ 38 39 /* 40 * MFP is used as keyboard controler, which may be used before 41 * ordinary initialization. 42 */ 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/device.h> 47 #include <sys/malloc.h> 48 49 #include <machine/bus.h> 50 #include <machine/cpu.h> 51 52 #include <arch/x68k/dev/intiovar.h> 53 #include <arch/x68k/dev/mfp.h> 54 55 static int mfp_match __P((struct device *, struct cfdata *, void *)); 56 static void mfp_attach __P((struct device *, struct device *, void *)); 57 static void mfp_init __P((void)); 58 static void mfp_calibrate_delay __P((void)); 59 60 CFATTACH_DECL(mfp, sizeof(struct mfp_softc), 61 mfp_match, mfp_attach, NULL, NULL); 62 63 static int 64 mfp_match(parent, cf, aux) 65 struct device *parent; 66 struct cfdata *cf; 67 void *aux; 68 { 69 struct intio_attach_args *ia = aux; 70 71 /* mfp0 */ 72 if (strcmp (ia->ia_name, "mfp") != 0) 73 return 0; 74 if (cf->cf_unit != 0) 75 return (0); 76 77 if (ia->ia_addr == INTIOCF_ADDR_DEFAULT) 78 ia->ia_addr = MFP_ADDR; 79 if (ia->ia_intr == INTIOCF_INTR_DEFAULT) 80 ia->ia_addr = MFP_INTR; 81 82 /* fixed address */ 83 if (ia->ia_addr != MFP_ADDR) 84 return (0); 85 if (ia->ia_intr != MFP_INTR) 86 return (0); 87 88 return (1); 89 } 90 91 92 static void 93 mfp_attach(parent, self, aux) 94 struct device *parent, *self; 95 void *aux; 96 { 97 struct mfp_softc *sc = (struct mfp_softc *)self; 98 struct intio_attach_args *ia = aux; 99 100 mfp_init (); 101 102 if (sc != NULL) { 103 /* realconfig */ 104 int r; 105 106 printf ("\n"); 107 108 sc->sc_bst = ia->ia_bst; 109 sc->sc_intr = ia->ia_intr; 110 ia->ia_size = 0x30; 111 r = intio_map_allocate_region (parent, ia, INTIO_MAP_ALLOCATE); 112 #ifdef DIAGNOSTIC 113 if (r) 114 panic ("IO map for MFP corruption??"); 115 #endif 116 bus_space_map(ia->ia_bst, ia->ia_addr, 0x2000, 0, &sc->sc_bht); 117 config_found (self, "kbd", NULL); 118 config_found (self, "clock", NULL); 119 config_found (self, "pow", NULL); 120 } else { 121 /* 122 * Called from config_console; 123 * calibrate the DELAY loop counter 124 */ 125 mfp_calibrate_delay(); 126 } 127 } 128 129 static void 130 mfp_init (void) 131 { 132 #if 0 /* done in x68k_init.c::intr_reset() */ 133 mfp_set_vr(MFP_INTR); 134 135 /* stop all interrupts */ 136 mfp_set_iera(0); 137 mfp_set_ierb(0); 138 #endif 139 140 /* Timer A settings */ 141 mfp_set_tacr(MFP_TIMERA_RESET | MFP_TIMERA_STOP); 142 143 /* Timer B settings: used for USART clock */ 144 mfp_set_tbcr(MFP_TIMERB_RESET | MFP_TIMERB_STOP); 145 146 /* Timer C/D settings */ 147 mfp_set_tcdcr(0); 148 } 149 150 extern int delay_divisor; 151 void _delay __P((u_int)); 152 153 static 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 << 8); 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 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 201 mfp_send_usart (command) 202 int command; 203 { 204 while (!(mfp_get_tsr() & MFP_TSR_BE)); 205 mfp_set_udr(command); 206 207 return 0; 208 } 209 210 int 211 mfp_receive_usart(void) 212 { 213 while (!(mfp_get_rsr() & MFP_RSR_BF)) 214 asm("nop"); 215 return mfp_get_udr(); 216 } 217