zs_hb.c revision 1.5
1 /* $NetBSD: zs_hb.c,v 1.5 2002/09/06 13:18:43 gehenna Exp $ */ 2 3 /*- 4 * Copyright (c) 1996 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Gordon W. Ross. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /* 40 * Zilog Z8530 Dual UART driver (machine-dependent part) 41 * 42 * Runs two serial lines per chip using slave drivers. 43 * Plain tty/async lines use the zs_async slave. 44 * Sun keyboard/mouse uses the zs_kbd/zs_ms slaves. 45 */ 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/device.h> 50 #include <sys/tty.h> 51 #include <sys/conf.h> 52 53 #include <machine/adrsmap.h> 54 #include <machine/autoconf.h> 55 #include <machine/cpu.h> 56 #include <machine/z8530var.h> 57 58 #include <dev/cons.h> 59 #include <dev/ic/z8530reg.h> 60 61 #include "zsc.h" /* NZSC */ 62 #define NZS NZSC 63 64 /* Make life easier for the initialized arrays here. */ 65 #if NZS < 2 66 #undef NZS 67 #define NZS 2 68 #endif 69 70 #define ZSCFLAG_EX 0x01 /* expansion board */ 71 72 /* 73 * The news3400 provides a 4.9152 MHz clock to the ZS chips. 74 */ 75 #define PCLK (9600 * 512) /* PCLK pin input clock rate */ 76 #define PCLK_EX (9600 * 384) 77 78 /* 79 * Define interrupt levels. 80 */ 81 #define ZSHARD_PRI 64 82 83 #define ZS_DELAY() {(void)*(volatile char *)INTEN1; delay(2);} 84 85 /* The layout of this is hardware-dependent (padding, order). */ 86 struct zschan { 87 volatile u_char zc_csr; /* ctrl,status, and indirect access */ 88 volatile u_char zc_data; /* data */ 89 }; 90 struct zsdevice { 91 /* Yes, they are backwards. */ 92 struct zschan zs_chan_b; 93 struct zschan zs_chan_a; 94 }; 95 96 extern int zs_def_cflag; 97 extern void (*zs_delay) __P((void)); 98 99 static struct zsdevice *zsaddr[NZS]; 100 101 /* Flags from cninit() */ 102 static int zs_hwflags[NZS][2]; 103 104 /* Default speed for all channels */ 105 static int zs_defspeed = 9600; 106 107 static u_char zs_init_reg[16] = { 108 0, /* 0: CMD (reset, etc.) */ 109 0, /* 1: No interrupts yet. */ 110 ZSHARD_PRI, /* IVECT */ 111 ZSWR3_RX_8 | ZSWR3_RX_ENABLE, 112 ZSWR4_CLK_X16 | ZSWR4_ONESB | ZSWR4_EVENP, 113 ZSWR5_TX_8 | ZSWR5_TX_ENABLE, 114 0, /* 6: TXSYNC/SYNCLO */ 115 0, /* 7: RXSYNC/SYNCHI */ 116 0, /* 8: alias for data port */ 117 ZSWR9_MASTER_IE, 118 0, /*10: Misc. TX/RX control bits */ 119 ZSWR11_TXCLK_BAUD | ZSWR11_RXCLK_BAUD, 120 ((PCLK/32)/9600)-2, /*12: BAUDLO (default=9600) */ 121 0, /*13: BAUDHI (default=9600) */ 122 ZSWR14_BAUD_ENA | ZSWR14_BAUD_FROM_PCLK, 123 ZSWR15_BREAK_IE, 124 }; 125 126 static struct zschan * zs_get_chan_addr __P((int, int)); 127 static void zs_hb_delay __P((void)); 128 static int zshard_hb __P((void *)); 129 static int zs_getc __P((void *)); 130 static void zs_putc __P((void *, int)); 131 int zshard __P((void *)); 132 int zs_get_speed __P((struct zs_chanstate *)); 133 134 struct zschan * 135 zs_get_chan_addr(zs_unit, channel) 136 int zs_unit, channel; 137 { 138 struct zsdevice *addr; 139 struct zschan *zc; 140 141 if (zs_unit >= NZS) 142 return NULL; 143 addr = zsaddr[zs_unit]; 144 if (addr == NULL) 145 return NULL; 146 if (channel == 0) { 147 zc = &addr->zs_chan_a; 148 } else { 149 zc = &addr->zs_chan_b; 150 } 151 return (zc); 152 } 153 154 void 155 zs_hb_delay() 156 { 157 ZS_DELAY(); 158 } 159 160 /**************************************************************** 161 * Autoconfig 162 ****************************************************************/ 163 164 /* Definition of the driver for autoconfig. */ 165 int zs_hb_match __P((struct device *, struct cfdata *, void *)); 166 void zs_hb_attach __P((struct device *, struct device *, void *)); 167 int zs_print __P((void *, const char *name)); 168 169 struct cfattach zsc_hb_ca = { 170 sizeof(struct zsc_softc), zs_hb_match, zs_hb_attach 171 }; 172 173 /* 174 * Is the zs chip present? 175 */ 176 int 177 zs_hb_match(parent, cf, aux) 178 struct device *parent; 179 struct cfdata *cf; 180 void *aux; 181 { 182 struct confargs *ca = aux; 183 184 if (strcmp(ca->ca_name, "zsc")) 185 return 0; 186 187 /* This returns -1 on a fault (bus error). */ 188 if (badaddr((char *)cf->cf_addr, 1)) 189 return 0; 190 191 return 1; 192 } 193 194 /* 195 * Attach a found zs. 196 * 197 * Match slave number to zs unit number, so that misconfiguration will 198 * not set up the keyboard as ttya, etc. 199 */ 200 void 201 zs_hb_attach(parent, self, aux) 202 struct device *parent; 203 struct device *self; 204 void *aux; 205 { 206 struct zsc_softc *zsc = (void *)self; 207 /* struct confargs *ca = aux; */ 208 struct zsc_attach_args zsc_args; 209 volatile struct zschan *zc; 210 struct zs_chanstate *cs; 211 int s, zs_unit, channel, intlevel; 212 static int didintr; 213 214 zs_unit = zsc->zsc_dev.dv_unit; 215 intlevel = zsc->zsc_dev.dv_cfdata->cf_level; 216 zsaddr[zs_unit] = (void *)zsc->zsc_dev.dv_cfdata->cf_addr; 217 218 if (intlevel == -1) { 219 #if 0 220 printf(": interrupt level not configured\n"); 221 return; 222 #else 223 printf(": interrupt level not configured; using"); 224 intlevel = 1; 225 #endif 226 } 227 228 printf(" level %d\n", intlevel); 229 230 zs_delay = zs_hb_delay; 231 232 /* 233 * Initialize software state for each channel. 234 */ 235 for (channel = 0; channel < 2; channel++) { 236 zsc_args.channel = channel; 237 zsc_args.hwflags = zs_hwflags[zs_unit][channel]; 238 cs = &zsc->zsc_cs_store[channel]; 239 zsc->zsc_cs[channel] = cs; 240 241 cs->cs_channel = channel; 242 cs->cs_private = NULL; 243 cs->cs_ops = &zsops_null; 244 if ((zsc->zsc_dev.dv_cfdata->cf_flags & ZSCFLAG_EX) == 0) 245 cs->cs_brg_clk = PCLK / 16; 246 else 247 cs->cs_brg_clk = PCLK_EX / 16; 248 249 zc = zs_get_chan_addr(zs_unit, channel); 250 cs->cs_reg_csr = &zc->zc_csr; 251 cs->cs_reg_data = &zc->zc_data; 252 253 bcopy(zs_init_reg, cs->cs_creg, 16); 254 bcopy(zs_init_reg, cs->cs_preg, 16); 255 256 /* XXX: Get these from the EEPROM instead? */ 257 /* XXX: See the mvme167 code. Better. */ 258 if (zsc_args.hwflags & ZS_HWFLAG_CONSOLE) 259 cs->cs_defspeed = zs_get_speed(cs); 260 else 261 cs->cs_defspeed = zs_defspeed; 262 cs->cs_defcflag = zs_def_cflag; 263 264 /* Make these correspond to cs_defcflag (-crtscts) */ 265 cs->cs_rr0_dcd = ZSRR0_DCD; 266 cs->cs_rr0_cts = 0; 267 cs->cs_wr5_dtr = ZSWR5_DTR | ZSWR5_RTS; 268 cs->cs_wr5_rts = 0; 269 270 /* 271 * Clear the master interrupt enable. 272 * The INTENA is common to both channels, 273 * so just do it on the A channel. 274 */ 275 if (channel == 0) { 276 zs_write_reg(cs, 9, 0); 277 } 278 279 /* 280 * Look for a child driver for this channel. 281 * The child attach will setup the hardware. 282 */ 283 if (!config_found(self, (void *)&zsc_args, zs_print)) { 284 /* No sub-driver. Just reset it. */ 285 u_char reset = (channel == 0) ? 286 ZSWR9_A_RESET : ZSWR9_B_RESET; 287 s = splhigh(); 288 zs_write_reg(cs, 9, reset); 289 splx(s); 290 } 291 } 292 293 /* 294 * Now safe to install interrupt handlers. Note the arguments 295 * to the interrupt handlers aren't used. Note, we only do this 296 * once since both SCCs interrupt at the same level and vector. 297 */ 298 if (!didintr) { 299 didintr = 1; 300 301 hb_intr_establish(intlevel, IPL_SERIAL, zshard_hb, NULL); 302 } 303 /* XXX; evcnt_attach() ? */ 304 305 /* 306 * Set the master interrupt enable and interrupt vector. 307 * (common to both channels, do it on A) 308 */ 309 cs = zsc->zsc_cs[0]; 310 s = splhigh(); 311 /* interrupt vector */ 312 zs_write_reg(cs, 2, zs_init_reg[2]); 313 /* master interrupt control (enable) */ 314 zs_write_reg(cs, 9, zs_init_reg[9]); 315 splx(s); 316 } 317 318 /* 319 * Our ZS chips all share a common, autovectored interrupt, 320 * so we have to look at all of them on each interrupt. 321 */ 322 static int 323 zshard_hb(arg) 324 void *arg; 325 { 326 (void) *(volatile u_char *)SCCVECT; 327 328 return zshard(arg); 329 } 330 331 /* 332 * Polled input char. 333 */ 334 int 335 zs_getc(arg) 336 void *arg; 337 { 338 register volatile struct zschan *zc = arg; 339 register int s, c, rr0; 340 341 s = splhigh(); 342 /* Wait for a character to arrive. */ 343 do { 344 rr0 = zc->zc_csr; 345 ZS_DELAY(); 346 } while ((rr0 & ZSRR0_RX_READY) == 0); 347 348 c = zc->zc_data; 349 ZS_DELAY(); 350 splx(s); 351 352 /* 353 * This is used by the kd driver to read scan codes, 354 * so don't translate '\r' ==> '\n' here... 355 */ 356 return (c); 357 } 358 359 /* 360 * Polled output char. 361 */ 362 void 363 zs_putc(arg, c) 364 void *arg; 365 int c; 366 { 367 register volatile struct zschan *zc = arg; 368 register int s, rr0; 369 370 s = splhigh(); 371 /* Wait for transmitter to become ready. */ 372 do { 373 rr0 = zc->zc_csr; 374 ZS_DELAY(); 375 } while ((rr0 & ZSRR0_TX_READY) == 0); 376 377 zc->zc_data = c; 378 ZS_DELAY(); 379 splx(s); 380 } 381 382 /*****************************************************************/ 383 384 static void zscnprobe __P((struct consdev *)); 385 static void zscninit __P((struct consdev *)); 386 static int zscngetc __P((dev_t)); 387 static void zscnputc __P((dev_t, int)); 388 static void zscnpollc __P((dev_t, int)); 389 390 struct consdev consdev_zs = { 391 zscnprobe, 392 zscninit, 393 zscngetc, 394 zscnputc, 395 zscnpollc, 396 NULL, 397 }; 398 399 void 400 zscnprobe(cn) 401 struct consdev *cn; 402 { 403 } 404 405 void 406 zscninit(cn) 407 struct consdev *cn; 408 { 409 extern const struct cdevsw zstty_cdevsw; 410 411 cn->cn_dev = makedev(cdevsw_lookup_major(&zstty_cdevsw), 0); 412 cn->cn_pri = CN_REMOTE; 413 zs_hwflags[0][0] = ZS_HWFLAG_CONSOLE; 414 } 415 416 int 417 zscngetc(dev) 418 dev_t dev; 419 { 420 return zs_getc((void *)SCCPORT0A); 421 } 422 423 void 424 zscnputc(dev, c) 425 dev_t dev; 426 int c; 427 { 428 zs_putc((void *)SCCPORT0A, c); 429 } 430 431 void 432 zscnpollc(dev, on) 433 dev_t dev; 434 int on; 435 { 436 } 437
Indexes created Tue Sep 30 11:09:46 GMT 2025