zs_hb.c revision 1.23
1 /* $NetBSD: zs_hb.c,v 1.23 2007/11/26 23:29:37 ad 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/cdefs.h> 48 __KERNEL_RCSID(0, "$NetBSD: zs_hb.c,v 1.23 2007/11/26 23:29:37 ad Exp $"); 49 50 #include <sys/param.h> 51 #include <sys/systm.h> 52 #include <sys/device.h> 53 #include <sys/tty.h> 54 #include <sys/conf.h> 55 #include <sys/cpu.h> 56 #include <sys/intr.h> 57 58 #include <machine/adrsmap.h> 59 #include <machine/z8530var.h> 60 61 #include <dev/cons.h> 62 #include <dev/ic/z8530reg.h> 63 64 #include <newsmips/dev/hbvar.h> 65 66 #include "zsc.h" /* NZSC */ 67 #define NZS NZSC 68 69 /* Make life easier for the initialized arrays here. */ 70 #if NZS < 2 71 #undef NZS 72 #define NZS 2 73 #endif 74 75 #define ZSCFLAG_EX 0x01 /* expansion board */ 76 77 /* 78 * The news3400 provides a 4.9152 MHz clock to the ZS chips. 79 */ 80 #define PCLK (9600 * 512) /* PCLK pin input clock rate */ 81 #define PCLK_EX (9600 * 384) 82 83 /* 84 * Define interrupt levels. 85 */ 86 #define ZSHARD_PRI 64 87 88 #define ZS_DELAY() {(void)*(volatile char *)INTEN1; delay(2);} 89 90 /* The layout of this is hardware-dependent (padding, order). */ 91 struct zschan { 92 volatile u_char zc_csr; /* ctrl,status, and indirect access */ 93 volatile u_char zc_data; /* data */ 94 }; 95 struct zsdevice { 96 /* Yes, they are backwards. */ 97 struct zschan zs_chan_b; 98 struct zschan zs_chan_a; 99 }; 100 101 extern int zs_def_cflag; 102 103 static struct zsdevice *zsaddr[NZS]; 104 105 /* Flags from cninit() */ 106 static int zs_hwflags[NZS][2]; 107 108 /* Default speed for all channels */ 109 static int zs_defspeed = 9600; 110 111 static u_char zs_init_reg[16] = { 112 0, /* 0: CMD (reset, etc.) */ 113 0, /* 1: No interrupts yet. */ 114 ZSHARD_PRI, /* IVECT */ 115 ZSWR3_RX_8 | ZSWR3_RX_ENABLE, 116 ZSWR4_CLK_X16 | ZSWR4_ONESB | ZSWR4_EVENP, 117 ZSWR5_TX_8 | ZSWR5_TX_ENABLE, 118 0, /* 6: TXSYNC/SYNCLO */ 119 0, /* 7: RXSYNC/SYNCHI */ 120 0, /* 8: alias for data port */ 121 ZSWR9_MASTER_IE, 122 0, /*10: Misc. TX/RX control bits */ 123 ZSWR11_TXCLK_BAUD | ZSWR11_RXCLK_BAUD, 124 ((PCLK/32)/9600)-2, /*12: BAUDLO (default=9600) */ 125 0, /*13: BAUDHI (default=9600) */ 126 ZSWR14_BAUD_ENA | ZSWR14_BAUD_FROM_PCLK, 127 ZSWR15_BREAK_IE, 128 }; 129 130 static struct zschan * zs_get_chan_addr(int, int); 131 static void zs_hb_delay(void); 132 static int zshard_hb(void *); 133 static int zs_getc(void *); 134 static void zs_putc(void *, int); 135 136 struct zschan * 137 zs_get_chan_addr(int zs_unit, int 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 static void 156 zs_hb_delay(void) 157 { 158 159 ZS_DELAY(); 160 } 161 162 /**************************************************************** 163 * Autoconfig 164 ****************************************************************/ 165 166 /* Definition of the driver for autoconfig. */ 167 int zs_hb_match(struct device *, struct cfdata *, void *); 168 void zs_hb_attach(struct device *, struct device *, void *); 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(struct device *parent, struct cfdata *cf, 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(struct device *parent, struct device *self, void *aux) 199 { 200 struct zsc_softc *zsc = (void *)self; 201 struct hb_attach_args *ha = aux; 202 struct zsc_attach_args zsc_args; 203 volatile struct zschan *zc; 204 struct zs_chanstate *cs; 205 int s, zs_unit, channel, intlevel; 206 static int didintr; 207 208 zs_unit = device_unit(&zsc->zsc_dev); 209 intlevel = ha->ha_level; 210 zsaddr[zs_unit] = (void *)ha->ha_addr; 211 212 if (intlevel == -1) { 213 #if 0 214 printf(": interrupt level not configured\n"); 215 return; 216 #else 217 printf(": interrupt level not configured; using"); 218 intlevel = 1; 219 #endif 220 } 221 222 printf(" level %d\n", intlevel); 223 224 zs_delay = zs_hb_delay; 225 226 /* 227 * Initialize software state for each channel. 228 */ 229 for (channel = 0; channel < 2; channel++) { 230 zsc_args.channel = channel; 231 zsc_args.hwflags = zs_hwflags[zs_unit][channel]; 232 cs = &zsc->zsc_cs_store[channel]; 233 zsc->zsc_cs[channel] = cs; 234 235 zs_lock_init(cs); 236 cs->cs_channel = channel; 237 cs->cs_private = NULL; 238 cs->cs_ops = &zsops_null; 239 if ((device_cfdata(&zsc->zsc_dev)->cf_flags & ZSCFLAG_EX) == 0) 240 cs->cs_brg_clk = PCLK / 16; 241 else 242 cs->cs_brg_clk = PCLK_EX / 16; 243 244 zc = zs_get_chan_addr(zs_unit, channel); 245 cs->cs_reg_csr = &zc->zc_csr; 246 cs->cs_reg_data = &zc->zc_data; 247 248 memcpy(cs->cs_creg, zs_init_reg, 16); 249 memcpy(cs->cs_preg, zs_init_reg, 16); 250 251 /* XXX: Get these from the EEPROM instead? */ 252 /* XXX: See the mvme167 code. Better. */ 253 if (zsc_args.hwflags & ZS_HWFLAG_CONSOLE) 254 cs->cs_defspeed = zs_get_speed(cs); 255 else 256 cs->cs_defspeed = zs_defspeed; 257 cs->cs_defcflag = zs_def_cflag; 258 259 /* Make these correspond to cs_defcflag (-crtscts) */ 260 cs->cs_rr0_dcd = ZSRR0_DCD; 261 cs->cs_rr0_cts = 0; 262 cs->cs_wr5_dtr = ZSWR5_DTR | ZSWR5_RTS; 263 cs->cs_wr5_rts = 0; 264 265 /* 266 * Clear the master interrupt enable. 267 * The INTENA is common to both channels, 268 * so just do it on the A channel. 269 */ 270 if (channel == 0) { 271 zs_write_reg(cs, 9, 0); 272 } 273 274 /* 275 * Look for a child driver for this channel. 276 * The child attach will setup the hardware. 277 */ 278 if (!config_found(self, (void *)&zsc_args, zs_print)) { 279 /* No sub-driver. Just reset it. */ 280 u_char reset = (channel == 0) ? 281 ZSWR9_A_RESET : ZSWR9_B_RESET; 282 s = splhigh(); 283 zs_write_reg(cs, 9, reset); 284 splx(s); 285 } 286 } 287 288 /* 289 * Now safe to install interrupt handlers. Note the arguments 290 * to the interrupt handlers aren't used. Note, we only do this 291 * once since both SCCs interrupt at the same level and vector. 292 */ 293 if (!didintr) { 294 didintr = 1; 295 296 zsc->zsc_si = softint_establish(SOFTINT_SERIAL, zssoft, zsc); 297 hb_intr_establish(intlevel, INTST1_SCC, IPL_SERIAL, 298 zshard_hb, NULL); 299 } 300 /* XXX; evcnt_attach() ? */ 301 302 /* 303 * Set the master interrupt enable and interrupt vector. 304 * (common to both channels, do it on A) 305 */ 306 cs = zsc->zsc_cs[0]; 307 s = splhigh(); 308 /* interrupt vector */ 309 zs_write_reg(cs, 2, zs_init_reg[2]); 310 /* master interrupt control (enable) */ 311 zs_write_reg(cs, 9, zs_init_reg[9]); 312 splx(s); 313 } 314 315 static int 316 zshard_hb(void *arg) 317 { 318 int rv; 319 320 (void) *(volatile u_char *)SCCVECT; 321 rv = zshard(arg); 322 323 /* XXX news3400 sometimes losts zs interrupt */ 324 if (rv) 325 zshard(arg); 326 327 return rv; 328 } 329 330 /* 331 * Polled input char. 332 */ 333 int 334 zs_getc(void *arg) 335 { 336 volatile struct zschan *zc = arg; 337 int s, c, rr0; 338 339 s = splhigh(); 340 /* Wait for a character to arrive. */ 341 do { 342 rr0 = zc->zc_csr; 343 ZS_DELAY(); 344 } while ((rr0 & ZSRR0_RX_READY) == 0); 345 346 c = zc->zc_data; 347 ZS_DELAY(); 348 splx(s); 349 350 /* 351 * This is used by the kd driver to read scan codes, 352 * so don't translate '\r' ==> '\n' here... 353 */ 354 return c; 355 } 356 357 /* 358 * Polled output char. 359 */ 360 void 361 zs_putc(void *arg, int c) 362 { 363 volatile struct zschan *zc = arg; 364 int s, rr0; 365 366 s = splhigh(); 367 /* Wait for transmitter to become ready. */ 368 do { 369 rr0 = zc->zc_csr; 370 ZS_DELAY(); 371 } while ((rr0 & ZSRR0_TX_READY) == 0); 372 373 zc->zc_data = c; 374 ZS_DELAY(); 375 splx(s); 376 } 377 378 /*****************************************************************/ 379 380 static void zscnprobe(struct consdev *); 381 static void zscninit(struct consdev *); 382 static int zscngetc(dev_t); 383 static void zscnputc(dev_t, int); 384 385 struct consdev consdev_zs = { 386 zscnprobe, 387 zscninit, 388 zscngetc, 389 zscnputc, 390 nullcnpollc, 391 NULL, 392 NULL, 393 NULL, 394 NODEV, 395 CN_DEAD 396 }; 397 398 static void 399 zscnprobe(struct consdev *cn) 400 { 401 } 402 403 static void 404 zscninit(struct consdev *cn) 405 { 406 extern const struct cdevsw zstty_cdevsw; 407 408 cn->cn_dev = makedev(cdevsw_lookup_major(&zstty_cdevsw), 0); 409 cn->cn_pri = CN_REMOTE; 410 zs_hwflags[0][0] = ZS_HWFLAG_CONSOLE; 411 } 412 413 static int 414 zscngetc(dev_t dev) 415 { 416 417 return zs_getc((void *)SCCPORT0A); 418 } 419 420 static void 421 zscnputc(dev_t dev, int c) 422 { 423 424 zs_putc((void *)SCCPORT0A, c); 425 } 426
Indexes created Tue Sep 30 11:09:46 GMT 2025