1 /* $NetBSD: mfp.c,v 1.19 2007/03/11 08:09:24 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 * 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 1.19 2007/03/11 08:09:24 isaki 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(struct device *, struct cfdata *, void *); 59 static void mfp_attach(struct device *, struct device *, void *); 60 static void mfp_init(void); 61 static void mfp_calibrate_delay(void); 62 63 CFATTACH_DECL(mfp, sizeof(struct mfp_softc), 64 mfp_match, mfp_attach, NULL, NULL); 65 66 static int mfp_attached; 67 68 static int 69 mfp_match(struct device *parent, struct cfdata *cf, void *aux) 70 { 71 struct intio_attach_args *ia = aux; 72 73 /* mfp0 */ 74 if (strcmp(ia->ia_name, "mfp") != 0) 75 return 0; 76 if (mfp_attached) 77 return (0); 78 79 if (ia->ia_addr == INTIOCF_ADDR_DEFAULT) 80 ia->ia_addr = MFP_ADDR; 81 if (ia->ia_intr == INTIOCF_INTR_DEFAULT) 82 ia->ia_addr = MFP_INTR; 83 84 /* fixed address */ 85 if (ia->ia_addr != MFP_ADDR) 86 return (0); 87 if (ia->ia_intr != MFP_INTR) 88 return (0); 89 90 return (1); 91 } 92 93 94 static void 95 mfp_attach(struct device *parent, struct device *self, 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 mfp_attached = 1; 109 sc->sc_bst = ia->ia_bst; 110 sc->sc_intr = ia->ia_intr; 111 ia->ia_size = 0x30; 112 r = intio_map_allocate_region(parent, ia, INTIO_MAP_ALLOCATE); 113 #ifdef DIAGNOSTIC 114 if (r) 115 panic("IO map for MFP corruption??"); 116 #endif 117 bus_space_map(ia->ia_bst, ia->ia_addr, 0x2000, 0, &sc->sc_bht); 118 config_found(self, __UNCONST("kbd"), NULL); 119 config_found(self, __UNCONST("clock"), NULL); 120 config_found(self, __UNCONST("pow"), NULL); 121 } else { 122 /* 123 * Called from config_console; 124 * calibrate the DELAY loop counter 125 */ 126 mfp_calibrate_delay(); 127 } 128 } 129 130 static void 131 mfp_init(void) 132 { 133 #if 0 /* done in x68k_init.c::intr_reset() */ 134 mfp_set_vr(MFP_INTR); 135 136 /* stop all interrupts */ 137 mfp_set_iera(0); 138 mfp_set_ierb(0); 139 #endif 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 void _delay(u_int); 153 154 static void 155 mfp_calibrate_delay(void) 156 { 157 /* 158 * Stolen from mvme68k. 159 */ 160 /* 161 * X68k provides 4MHz clock (= 0.25usec) for MFP timer C. 162 * 10000usec = 0.25usec * 200 * 200 163 * Our slowest clock is 20MHz (?). Its delay_divisor value 164 * should be about 102. Start from 140 here. 165 */ 166 for (delay_divisor = 140; delay_divisor > 0; delay_divisor--) { 167 mfp_set_tcdr(255-0); 168 mfp_set_tcdcr(0x70); /* 1/200 delay mode */ 169 _delay(10000 << 8); 170 mfp_set_tcdcr(0); /* stop timer */ 171 if ((255 - mfp_get_tcdr()) > 200) 172 break; /* got it! */ 173 /* retry! */ 174 } 175 } 176 177 /* 178 * MFP utility functions 179 */ 180 181 /* 182 * wait for built-in display hsync. 183 * should be called before writing to frame buffer. 184 * might be called before realconfig. 185 */ 186 void 187 mfp_wait_for_hsync(void) 188 { 189 /* wait for CRT HSYNC */ 190 while (mfp_get_gpip() & MFP_GPIP_HSYNC) 191 __asm("nop"); 192 while (!(mfp_get_gpip() & MFP_GPIP_HSYNC)) 193 __asm("nop"); 194 } 195 196 /* 197 * send COMMAND to the MFP USART. 198 * USART is attached to the keyboard. 199 * might be called before realconfig. 200 */ 201 int 202 mfp_send_usart(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