1 /* $NetBSD: mfp.c,v 1.11 2004/01/04 16:19:44 wiz 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 controller, which may be used before 41 * ordinary initialization. 42 */ 43 44 #include <sys/cdefs.h> 45 __KERNEL_RCSID(0, "$NetBSD: mfp.c,v 1.11 2004/01/04 16:19:44 wiz Exp $"); 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/device.h> 50 #include <sys/malloc.h> 51 52 #include <machine/bus.h> 53 #include <machine/cpu.h> 54 55 #include <arch/x68k/dev/intiovar.h> 56 #include <arch/x68k/dev/mfp.h> 57 58 static int mfp_match __P((struct device *, struct cfdata *, void *)); 59 static void mfp_attach __P((struct device *, struct device *, void *)); 60 static void mfp_init __P((void)); 61 static void mfp_calibrate_delay __P((void)); 62 63 CFATTACH_DECL(mfp, sizeof(struct mfp_softc), 64 mfp_match, mfp_attach, NULL, NULL); 65 66 static int 67 mfp_match(parent, cf, aux) 68 struct device *parent; 69 struct cfdata *cf; 70 void *aux; 71 { 72 struct intio_attach_args *ia = aux; 73 74 /* mfp0 */ 75 if (strcmp (ia->ia_name, "mfp") != 0) 76 return 0; 77 if (cf->cf_unit != 0) 78 return (0); 79 80 if (ia->ia_addr == INTIOCF_ADDR_DEFAULT) 81 ia->ia_addr = MFP_ADDR; 82 if (ia->ia_intr == INTIOCF_INTR_DEFAULT) 83 ia->ia_addr = MFP_INTR; 84 85 /* fixed address */ 86 if (ia->ia_addr != MFP_ADDR) 87 return (0); 88 if (ia->ia_intr != MFP_INTR) 89 return (0); 90 91 return (1); 92 } 93 94 95 static void 96 mfp_attach(parent, self, aux) 97 struct device *parent, *self; 98 void *aux; 99 { 100 struct mfp_softc *sc = (struct mfp_softc *)self; 101 struct intio_attach_args *ia = aux; 102 103 mfp_init (); 104 105 if (sc != NULL) { 106 /* realconfig */ 107 int r; 108 109 printf ("\n"); 110 111 sc->sc_bst = ia->ia_bst; 112 sc->sc_intr = ia->ia_intr; 113 ia->ia_size = 0x30; 114 r = intio_map_allocate_region (parent, ia, INTIO_MAP_ALLOCATE); 115 #ifdef DIAGNOSTIC 116 if (r) 117 panic ("IO map for MFP corruption??"); 118 #endif 119 bus_space_map(ia->ia_bst, ia->ia_addr, 0x2000, 0, &sc->sc_bht); 120 config_found (self, "kbd", NULL); 121 config_found (self, "clock", NULL); 122 config_found (self, "pow", NULL); 123 } else { 124 /* 125 * Called from config_console; 126 * calibrate the DELAY loop counter 127 */ 128 mfp_calibrate_delay(); 129 } 130 } 131 132 static void 133 mfp_init (void) 134 { 135 #if 0 /* done in x68k_init.c::intr_reset() */ 136 mfp_set_vr(MFP_INTR); 137 138 /* stop all interrupts */ 139 mfp_set_iera(0); 140 mfp_set_ierb(0); 141 #endif 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 __P((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 (command) 205 int command; 206 { 207 while (!(mfp_get_tsr() & MFP_TSR_BE)); 208 mfp_set_udr(command); 209 210 return 0; 211 } 212 213 int 214 mfp_receive_usart(void) 215 { 216 while (!(mfp_get_rsr() & MFP_RSR_BF)) 217 asm("nop"); 218 return mfp_get_udr(); 219 } 220