zs_hb.c revision 1.16
1 /* $NetBSD: zs_hb.c,v 1.16 2003/05/25 14:02:48 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 53 #include <machine/adrsmap.h> 54 #include <machine/cpu.h> 55 #include <machine/z8530var.h> 56 57 #include <dev/cons.h> 58 #include <dev/ic/z8530reg.h> 59 60 #include <newsmips/dev/hbvar.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 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)); 131 132 struct zschan * 133 zs_get_chan_addr(zs_unit, channel) 134 int zs_unit, channel; 135 { 136 struct zsdevice *addr; 137 struct zschan *zc; 138 139 if (zs_unit >= NZS) 140 return NULL; 141 addr = zsaddr[zs_unit]; 142 if (addr == NULL) 143 return NULL; 144 if (channel == 0) { 145 zc = &addr->zs_chan_a; 146 } else { 147 zc = &addr->zs_chan_b; 148 } 149 return (zc); 150 } 151 152 static void 153 zs_hb_delay() 154 { 155 156 ZS_DELAY(); 157 } 158 159 /**************************************************************** 160 * Autoconfig 161 ****************************************************************/ 162 163 /* Definition of the driver for autoconfig. */ 164 int zs_hb_match __P((struct device *, struct cfdata *, void *)); 165 void zs_hb_attach __P((struct device *, struct device *, void *)); 166 167 CFATTACH_DECL(zsc_hb, sizeof(struct zsc_softc), 168 zs_hb_match, zs_hb_attach, NULL, NULL); 169 170 /* 171 * Is the zs chip present? 172 */ 173 int 174 zs_hb_match(parent, cf, aux) 175 struct device *parent; 176 struct cfdata *cf; 177 void *aux; 178 { 179 struct hb_attach_args *ha = aux; 180 181 if (strcmp(ha->ha_name, "zsc")) 182 return 0; 183 184 /* This returns -1 on a fault (bus error). */ 185 if (hb_badaddr((char *)ha->ha_addr, 1)) 186 return 0; 187 188 return 1; 189 } 190 191 /* 192 * Attach a found zs. 193 * 194 * Match slave number to zs unit number, so that misconfiguration will 195 * not set up the keyboard as ttya, etc. 196 */ 197 void 198 zs_hb_attach(parent, self, aux) 199 struct device *parent; 200 struct device *self; 201 void *aux; 202 { 203 struct zsc_softc *zsc = (void *)self; 204 struct hb_attach_args *ha = aux; 205 struct zsc_attach_args zsc_args; 206 volatile struct zschan *zc; 207 struct zs_chanstate *cs; 208 int s, zs_unit, channel, intlevel; 209 static int didintr; 210 211 zs_unit = zsc->zsc_dev.dv_unit; 212 intlevel = ha->ha_level; 213 zsaddr[zs_unit] = (void *)ha->ha_addr; 214 215 if (intlevel == -1) { 216 #if 0 217 printf(": interrupt level not configured\n"); 218 return; 219 #else 220 printf(": interrupt level not configured; using"); 221 intlevel = 1; 222 #endif 223 } 224 225 printf(" level %d\n", intlevel); 226 227 zs_delay = zs_hb_delay; 228 229 /* 230 * Initialize software state for each channel. 231 */ 232 for (channel = 0; channel < 2; channel++) { 233 zsc_args.channel = channel; 234 zsc_args.hwflags = zs_hwflags[zs_unit][channel]; 235 cs = &zsc->zsc_cs_store[channel]; 236 zsc->zsc_cs[channel] = cs; 237 238 simple_lock_init(&cs->cs_lock); 239 cs->cs_channel = channel; 240 cs->cs_private = NULL; 241 cs->cs_ops = &zsops_null; 242 if ((zsc->zsc_dev.dv_cfdata->cf_flags & ZSCFLAG_EX) == 0) 243 cs->cs_brg_clk = PCLK / 16; 244 else 245 cs->cs_brg_clk = PCLK_EX / 16; 246 247 zc = zs_get_chan_addr(zs_unit, channel); 248 cs->cs_reg_csr = &zc->zc_csr; 249 cs->cs_reg_data = &zc->zc_data; 250 251 bcopy(zs_init_reg, cs->cs_creg, 16); 252 bcopy(zs_init_reg, cs->cs_preg, 16); 253 254 /* XXX: Get these from the EEPROM instead? */ 255 /* XXX: See the mvme167 code. Better. */ 256 if (zsc_args.hwflags & ZS_HWFLAG_CONSOLE) 257 cs->cs_defspeed = zs_get_speed(cs); 258 else 259 cs->cs_defspeed = zs_defspeed; 260 cs->cs_defcflag = zs_def_cflag; 261 262 /* Make these correspond to cs_defcflag (-crtscts) */ 263 cs->cs_rr0_dcd = ZSRR0_DCD; 264 cs->cs_rr0_cts = 0; 265 cs->cs_wr5_dtr = ZSWR5_DTR | ZSWR5_RTS; 266 cs->cs_wr5_rts = 0; 267 268 /* 269 * Clear the master interrupt enable. 270 * The INTENA is common to both channels, 271 * so just do it on the A channel. 272 */ 273 if (channel == 0) { 274 zs_write_reg(cs, 9, 0); 275 } 276 277 /* 278 * Look for a child driver for this channel. 279 * The child attach will setup the hardware. 280 */ 281 if (!config_found(self, (void *)&zsc_args, zs_print)) { 282 /* No sub-driver. Just reset it. */ 283 u_char reset = (channel == 0) ? 284 ZSWR9_A_RESET : ZSWR9_B_RESET; 285 s = splhigh(); 286 zs_write_reg(cs, 9, reset); 287 splx(s); 288 } 289 } 290 291 /* 292 * Now safe to install interrupt handlers. Note the arguments 293 * to the interrupt handlers aren't used. Note, we only do this 294 * once since both SCCs interrupt at the same level and vector. 295 */ 296 if (!didintr) { 297 didintr = 1; 298 299 zsc->zsc_si = softintr_establish(IPL_SOFTSERIAL, zssoft, zsc); 300 hb_intr_establish(intlevel, INTST1_SCC, IPL_SERIAL, 301 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 static int 319 zshard_hb(arg) 320 void *arg; 321 { 322 int rv; 323 324 (void) *(volatile u_char *)SCCVECT; 325 rv = zshard(arg); 326 327 /* XXX news3400 sometimes losts zs interrupt */ 328 if (rv) 329 zshard(arg); 330 331 return rv; 332 } 333 334 /* 335 * Polled input char. 336 */ 337 int 338 zs_getc(arg) 339 void *arg; 340 { 341 volatile struct zschan *zc = arg; 342 int s, c, rr0; 343 344 s = splhigh(); 345 /* Wait for a character to arrive. */ 346 do { 347 rr0 = zc->zc_csr; 348 ZS_DELAY(); 349 } while ((rr0 & ZSRR0_RX_READY) == 0); 350 351 c = zc->zc_data; 352 ZS_DELAY(); 353 splx(s); 354 355 /* 356 * This is used by the kd driver to read scan codes, 357 * so don't translate '\r' ==> '\n' here... 358 */ 359 return (c); 360 } 361 362 /* 363 * Polled output char. 364 */ 365 void 366 zs_putc(arg, c) 367 void *arg; 368 int c; 369 { 370 volatile struct zschan *zc = arg; 371 int s, rr0; 372 373 s = splhigh(); 374 /* Wait for transmitter to become ready. */ 375 do { 376 rr0 = zc->zc_csr; 377 ZS_DELAY(); 378 } while ((rr0 & ZSRR0_TX_READY) == 0); 379 380 zc->zc_data = c; 381 ZS_DELAY(); 382 splx(s); 383 } 384 385 /*****************************************************************/ 386 387 static void zscnprobe __P((struct consdev *)); 388 static void zscninit __P((struct consdev *)); 389 static int zscngetc __P((dev_t)); 390 static void zscnputc __P((dev_t, int)); 391 392 struct consdev consdev_zs = { 393 zscnprobe, 394 zscninit, 395 zscngetc, 396 zscnputc, 397 nullcnpollc, 398 NULL, 399 NULL, 400 NULL, 401 NODEV, 402 CN_DEAD 403 }; 404 405 static void 406 zscnprobe(cn) 407 struct consdev *cn; 408 { 409 } 410 411 static void 412 zscninit(cn) 413 struct consdev *cn; 414 { 415 extern const struct cdevsw zstty_cdevsw; 416 417 cn->cn_dev = makedev(cdevsw_lookup_major(&zstty_cdevsw), 0); 418 cn->cn_pri = CN_REMOTE; 419 zs_hwflags[0][0] = ZS_HWFLAG_CONSOLE; 420 } 421 422 static int 423 zscngetc(dev) 424 dev_t dev; 425 { 426 427 return zs_getc((void *)SCCPORT0A); 428 } 429 430 static void 431 zscnputc(dev, c) 432 dev_t dev; 433 int c; 434 { 435 436 zs_putc((void *)SCCPORT0A, c); 437 } 438
Indexes created Tue Sep 30 11:09:46 GMT 2025