1 /* $NetBSD: mfp.c,v 1.21 2008/12/31 08:00:31 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 1.21 2008/12/31 08:00:31 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 int mfp_search(device_t, cfdata_t, const int *, void *); 61 static void mfp_init(void); 62 static void mfp_calibrate_delay(void); 63 64 CFATTACH_DECL(mfp, sizeof(struct mfp_softc), 65 mfp_match, mfp_attach, NULL, NULL); 66 67 static int mfp_attached; 68 69 static int 70 mfp_match(struct device *parent, struct cfdata *cf, 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 (mfp_attached) 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(struct device *parent, struct device *self, void *aux) 97 { 98 struct mfp_softc *sc = (struct mfp_softc *)self; 99 struct intio_attach_args *ia = aux; 100 101 mfp_init(); 102 103 if (sc != NULL) { 104 /* realconfig */ 105 int r; 106 107 printf("\n"); 108 109 mfp_attached = 1; 110 sc->sc_bst = ia->ia_bst; 111 sc->sc_intr = ia->ia_intr; 112 ia->ia_size = 0x30; 113 r = intio_map_allocate_region(parent, ia, INTIO_MAP_ALLOCATE); 114 #ifdef DIAGNOSTIC 115 if (r) 116 panic("IO map for MFP corruption??"); 117 #endif 118 bus_space_map(ia->ia_bst, ia->ia_addr, 0x2000, 0, &sc->sc_bht); 119 config_search_ia(mfp_search, self, "mfp", 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 int 130 mfp_search(device_t parent, cfdata_t cf, const int *loc, void *aux) 131 { 132 if (config_match(parent, cf, __UNCONST(cf->cf_name)) > 0) 133 config_attach(parent, cf, __UNCONST(cf->cf_name), NULL); 134 return 0; 135 } 136 137 static void 138 mfp_init(void) 139 { 140 mfp_set_vr(MFP_INTR); 141 142 /* stop all interrupts */ 143 mfp_set_iera(0); 144 mfp_set_ierb(0); 145 146 /* make MSCTRL 'High', XXX where should I do it? */ 147 mfp_send_usart(0x41); 148 149 /* Timer A settings */ 150 mfp_set_tacr(MFP_TIMERA_RESET | MFP_TIMERA_STOP); 151 152 /* Timer B settings: used for USART clock */ 153 mfp_set_tbcr(MFP_TIMERB_RESET | MFP_TIMERB_STOP); 154 155 /* Timer C/D settings */ 156 mfp_set_tcdcr(0); 157 } 158 159 extern int delay_divisor; 160 void _delay(u_int); 161 162 static void 163 mfp_calibrate_delay(void) 164 { 165 /* 166 * Stolen from mvme68k. 167 */ 168 /* 169 * X68k provides 4MHz clock (= 0.25usec) for MFP timer C. 170 * 10000usec = 0.25usec * 200 * 200 171 * Our slowest clock is 20MHz (?). Its delay_divisor value 172 * should be about 102. Start from 140 here. 173 */ 174 for (delay_divisor = 140; delay_divisor > 0; delay_divisor--) { 175 mfp_set_tcdr(255-0); 176 mfp_set_tcdcr(0x70); /* 1/200 delay mode */ 177 _delay(10000 << 8); 178 mfp_set_tcdcr(0); /* stop timer */ 179 if ((255 - mfp_get_tcdr()) > 200) 180 break; /* got it! */ 181 /* retry! */ 182 } 183 } 184 185 /* 186 * MFP utility functions 187 */ 188 189 /* 190 * wait for built-in display hsync. 191 * should be called before writing to frame buffer. 192 * might be called before realconfig. 193 */ 194 void 195 mfp_wait_for_hsync(void) 196 { 197 /* wait for CRT HSYNC */ 198 while (mfp_get_gpip() & MFP_GPIP_HSYNC) 199 __asm("nop"); 200 while (!(mfp_get_gpip() & MFP_GPIP_HSYNC)) 201 __asm("nop"); 202 } 203 204 /* 205 * send COMMAND to the MFP USART. 206 * USART is attached to the keyboard. 207 * might be called before realconfig. 208 */ 209 int 210 mfp_send_usart(int command) 211 { 212 while (!(mfp_get_tsr() & MFP_TSR_BE)); 213 mfp_set_udr(command); 214 215 return 0; 216 } 217 218 int 219 mfp_receive_usart(void) 220 { 221 while (!(mfp_get_rsr() & MFP_RSR_BF)) 222 __asm("nop"); 223 return mfp_get_udr(); 224 } 225