zs_hb.c revision 1.9
1 /* $NetBSD: zs_hb.c,v 1.9 2003/02/10 11:38:31 tsutsui 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 #include <sys/lock.h> 53 54 #include <machine/adrsmap.h> 55 #include <machine/autoconf.h> 56 #include <machine/cpu.h> 57 #include <machine/z8530var.h> 58 59 #include <dev/cons.h> 60 #include <dev/ic/z8530reg.h> 61 62 #include "zsc.h" /* NZSC */ 63 #define NZS NZSC 64 65 /* Make life easier for the initialized arrays here. */ 66 #if NZS < 2 67 #undef NZS 68 #define NZS 2 69 #endif 70 71 #define ZSCFLAG_EX 0x01 /* expansion board */ 72 73 /* 74 * The news3400 provides a 4.9152 MHz clock to the ZS chips. 75 */ 76 #define PCLK (9600 * 512) /* PCLK pin input clock rate */ 77 #define PCLK_EX (9600 * 384) 78 79 /* 80 * Define interrupt levels. 81 */ 82 #define ZSHARD_PRI 64 83 84 #define ZS_DELAY() {(void)*(volatile char *)INTEN1; delay(2);} 85 86 /* The layout of this is hardware-dependent (padding, order). */ 87 struct zschan { 88 volatile u_char zc_csr; /* ctrl,status, and indirect access */ 89 volatile u_char zc_data; /* data */ 90 }; 91 struct zsdevice { 92 /* Yes, they are backwards. */ 93 struct zschan zs_chan_b; 94 struct zschan zs_chan_a; 95 }; 96 97 extern int zs_def_cflag; 98 extern void (*zs_delay) __P((void)); 99 100 static struct zsdevice *zsaddr[NZS]; 101 102 /* Flags from cninit() */ 103 static int zs_hwflags[NZS][2]; 104 105 /* Default speed for all channels */ 106 static int zs_defspeed = 9600; 107 108 static u_char zs_init_reg[16] = { 109 0, /* 0: CMD (reset, etc.) */ 110 0, /* 1: No interrupts yet. */ 111 ZSHARD_PRI, /* IVECT */ 112 ZSWR3_RX_8 | ZSWR3_RX_ENABLE, 113 ZSWR4_CLK_X16 | ZSWR4_ONESB | ZSWR4_EVENP, 114 ZSWR5_TX_8 | ZSWR5_TX_ENABLE, 115 0, /* 6: TXSYNC/SYNCLO */ 116 0, /* 7: RXSYNC/SYNCHI */ 117 0, /* 8: alias for data port */ 118 ZSWR9_MASTER_IE, 119 0, /*10: Misc. TX/RX control bits */ 120 ZSWR11_TXCLK_BAUD | ZSWR11_RXCLK_BAUD, 121 ((PCLK/32)/9600)-2, /*12: BAUDLO (default=9600) */ 122 0, /*13: BAUDHI (default=9600) */ 123 ZSWR14_BAUD_ENA | ZSWR14_BAUD_FROM_PCLK, 124 ZSWR15_BREAK_IE, 125 }; 126 127 static struct zschan * zs_get_chan_addr __P((int, int)); 128 static void zs_hb_delay __P((void)); 129 static int zshard_hb __P((void *)); 130 static int zs_getc __P((void *)); 131 static void zs_putc __P((void *, int)); 132 int zshard __P((void *)); 133 int zs_get_speed __P((struct zs_chanstate *)); 134 135 struct zschan * 136 zs_get_chan_addr(zs_unit, channel) 137 int zs_unit, channel; 138 { 139 struct zsdevice *addr; 140 struct zschan *zc; 141 142 if (zs_unit >= NZS) 143 return NULL; 144 addr = zsaddr[zs_unit]; 145 if (addr == NULL) 146 return NULL; 147 if (channel == 0) { 148 zc = &addr->zs_chan_a; 149 } else { 150 zc = &addr->zs_chan_b; 151 } 152 return (zc); 153 } 154 155 void 156 zs_hb_delay() 157 { 158 ZS_DELAY(); 159 } 160 161 /**************************************************************** 162 * Autoconfig 163 ****************************************************************/ 164 165 /* Definition of the driver for autoconfig. */ 166 int zs_hb_match __P((struct device *, struct cfdata *, void *)); 167 void zs_hb_attach __P((struct device *, struct device *, void *)); 168 int zs_print __P((void *, const char *name)); 169 170 CFATTACH_DECL(zsc_hb, sizeof(struct zsc_softc), 171 zs_hb_match, zs_hb_attach, NULL, NULL); 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 simple_lock_init(&cs->cs_lock); 242 cs->cs_channel = channel; 243 cs->cs_private = NULL; 244 cs->cs_ops = &zsops_null; 245 if ((zsc->zsc_dev.dv_cfdata->cf_flags & ZSCFLAG_EX) == 0) 246 cs->cs_brg_clk = PCLK / 16; 247 else 248 cs->cs_brg_clk = PCLK_EX / 16; 249 250 zc = zs_get_chan_addr(zs_unit, channel); 251 cs->cs_reg_csr = &zc->zc_csr; 252 cs->cs_reg_data = &zc->zc_data; 253 254 bcopy(zs_init_reg, cs->cs_creg, 16); 255 bcopy(zs_init_reg, cs->cs_preg, 16); 256 257 /* XXX: Get these from the EEPROM instead? */ 258 /* XXX: See the mvme167 code. Better. */ 259 if (zsc_args.hwflags & ZS_HWFLAG_CONSOLE) 260 cs->cs_defspeed = zs_get_speed(cs); 261 else 262 cs->cs_defspeed = zs_defspeed; 263 cs->cs_defcflag = zs_def_cflag; 264 265 /* Make these correspond to cs_defcflag (-crtscts) */ 266 cs->cs_rr0_dcd = ZSRR0_DCD; 267 cs->cs_rr0_cts = 0; 268 cs->cs_wr5_dtr = ZSWR5_DTR | ZSWR5_RTS; 269 cs->cs_wr5_rts = 0; 270 271 /* 272 * Clear the master interrupt enable. 273 * The INTENA is common to both channels, 274 * so just do it on the A channel. 275 */ 276 if (channel == 0) { 277 zs_write_reg(cs, 9, 0); 278 } 279 280 /* 281 * Look for a child driver for this channel. 282 * The child attach will setup the hardware. 283 */ 284 if (!config_found(self, (void *)&zsc_args, zs_print)) { 285 /* No sub-driver. Just reset it. */ 286 u_char reset = (channel == 0) ? 287 ZSWR9_A_RESET : ZSWR9_B_RESET; 288 s = splhigh(); 289 zs_write_reg(cs, 9, reset); 290 splx(s); 291 } 292 } 293 294 /* 295 * Now safe to install interrupt handlers. Note the arguments 296 * to the interrupt handlers aren't used. Note, we only do this 297 * once since both SCCs interrupt at the same level and vector. 298 */ 299 if (!didintr) { 300 didintr = 1; 301 302 hb_intr_establish(intlevel, IPL_SERIAL, zshard_hb, NULL); 303 } 304 /* XXX; evcnt_attach() ? */ 305 306 /* 307 * Set the master interrupt enable and interrupt vector. 308 * (common to both channels, do it on A) 309 */ 310 cs = zsc->zsc_cs[0]; 311 s = splhigh(); 312 /* interrupt vector */ 313 zs_write_reg(cs, 2, zs_init_reg[2]); 314 /* master interrupt control (enable) */ 315 zs_write_reg(cs, 9, zs_init_reg[9]); 316 splx(s); 317 } 318 319 /* 320 * Our ZS chips all share a common, autovectored interrupt, 321 * so we have to look at all of them on each interrupt. 322 */ 323 static int 324 zshard_hb(arg) 325 void *arg; 326 { 327 (void) *(volatile u_char *)SCCVECT; 328 329 return zshard(arg); 330 } 331 332 /* 333 * Polled input char. 334 */ 335 int 336 zs_getc(arg) 337 void *arg; 338 { 339 register volatile struct zschan *zc = arg; 340 register int s, c, rr0; 341 342 s = splhigh(); 343 /* Wait for a character to arrive. */ 344 do { 345 rr0 = zc->zc_csr; 346 ZS_DELAY(); 347 } while ((rr0 & ZSRR0_RX_READY) == 0); 348 349 c = zc->zc_data; 350 ZS_DELAY(); 351 splx(s); 352 353 /* 354 * This is used by the kd driver to read scan codes, 355 * so don't translate '\r' ==> '\n' here... 356 */ 357 return (c); 358 } 359 360 /* 361 * Polled output char. 362 */ 363 void 364 zs_putc(arg, c) 365 void *arg; 366 int c; 367 { 368 register volatile struct zschan *zc = arg; 369 register int s, rr0; 370 371 s = splhigh(); 372 /* Wait for transmitter to become ready. */ 373 do { 374 rr0 = zc->zc_csr; 375 ZS_DELAY(); 376 } while ((rr0 & ZSRR0_TX_READY) == 0); 377 378 zc->zc_data = c; 379 ZS_DELAY(); 380 splx(s); 381 } 382 383 /*****************************************************************/ 384 385 static void zscnprobe __P((struct consdev *)); 386 static void zscninit __P((struct consdev *)); 387 static int zscngetc __P((dev_t)); 388 static void zscnputc __P((dev_t, int)); 389 static void zscnpollc __P((dev_t, int)); 390 391 struct consdev consdev_zs = { 392 zscnprobe, 393 zscninit, 394 zscngetc, 395 zscnputc, 396 zscnpollc, 397 NULL, 398 }; 399 400 void 401 zscnprobe(cn) 402 struct consdev *cn; 403 { 404 } 405 406 void 407 zscninit(cn) 408 struct consdev *cn; 409 { 410 extern const struct cdevsw zstty_cdevsw; 411 412 cn->cn_dev = makedev(cdevsw_lookup_major(&zstty_cdevsw), 0); 413 cn->cn_pri = CN_REMOTE; 414 zs_hwflags[0][0] = ZS_HWFLAG_CONSOLE; 415 } 416 417 int 418 zscngetc(dev) 419 dev_t dev; 420 { 421 return zs_getc((void *)SCCPORT0A); 422 } 423 424 void 425 zscnputc(dev, c) 426 dev_t dev; 427 int c; 428 { 429 zs_putc((void *)SCCPORT0A, c); 430 } 431 432 void 433 zscnpollc(dev, on) 434 dev_t dev; 435 int on; 436 { 437 } 438
Indexes created Tue Oct 28 12:10:06 GMT 2025