zs_hb.c revision 1.22
1 /* $NetBSD: zs_hb.c,v 1.22 2007/11/09 00:05:05 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 1.22 2007/11/09 00:05:05 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 56 #include <machine/adrsmap.h> 57 #include <machine/cpu.h> 58 #include <machine/z8530var.h> 59 60 #include <dev/cons.h> 61 #include <dev/ic/z8530reg.h> 62 63 #include <newsmips/dev/hbvar.h> 64 65 #include "zsc.h" /* NZSC */ 66 #define NZS NZSC 67 68 /* Make life easier for the initialized arrays here. */ 69 #if NZS < 2 70 #undef NZS 71 #define NZS 2 72 #endif 73 74 #define ZSCFLAG_EX 0x01 /* expansion board */ 75 76 /* 77 * The news3400 provides a 4.9152 MHz clock to the ZS chips. 78 */ 79 #define PCLK (9600 * 512) /* PCLK pin input clock rate */ 80 #define PCLK_EX (9600 * 384) 81 82 /* 83 * Define interrupt levels. 84 */ 85 #define ZSHARD_PRI 64 86 87 #define ZS_DELAY() {(void)*(volatile char *)INTEN1; delay(2);} 88 89 /* The layout of this is hardware-dependent (padding, order). */ 90 struct zschan { 91 volatile u_char zc_csr; /* ctrl,status, and indirect access */ 92 volatile u_char zc_data; /* data */ 93 }; 94 struct zsdevice { 95 /* Yes, they are backwards. */ 96 struct zschan zs_chan_b; 97 struct zschan zs_chan_a; 98 }; 99 100 extern int zs_def_cflag; 101 102 static struct zsdevice *zsaddr[NZS]; 103 104 /* Flags from cninit() */ 105 static int zs_hwflags[NZS][2]; 106 107 /* Default speed for all channels */ 108 static int zs_defspeed = 9600; 109 110 static u_char zs_init_reg[16] = { 111 0, /* 0: CMD (reset, etc.) */ 112 0, /* 1: No interrupts yet. */ 113 ZSHARD_PRI, /* IVECT */ 114 ZSWR3_RX_8 | ZSWR3_RX_ENABLE, 115 ZSWR4_CLK_X16 | ZSWR4_ONESB | ZSWR4_EVENP, 116 ZSWR5_TX_8 | ZSWR5_TX_ENABLE, 117 0, /* 6: TXSYNC/SYNCLO */ 118 0, /* 7: RXSYNC/SYNCHI */ 119 0, /* 8: alias for data port */ 120 ZSWR9_MASTER_IE, 121 0, /*10: Misc. TX/RX control bits */ 122 ZSWR11_TXCLK_BAUD | ZSWR11_RXCLK_BAUD, 123 ((PCLK/32)/9600)-2, /*12: BAUDLO (default=9600) */ 124 0, /*13: BAUDHI (default=9600) */ 125 ZSWR14_BAUD_ENA | ZSWR14_BAUD_FROM_PCLK, 126 ZSWR15_BREAK_IE, 127 }; 128 129 static struct zschan * zs_get_chan_addr(int, int); 130 static void zs_hb_delay(void); 131 static int zshard_hb(void *); 132 static int zs_getc(void *); 133 static void zs_putc(void *, int); 134 135 struct zschan * 136 zs_get_chan_addr(int zs_unit, int 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 static void 155 zs_hb_delay(void) 156 { 157 158 ZS_DELAY(); 159 } 160 161 /**************************************************************** 162 * Autoconfig 163 ****************************************************************/ 164 165 /* Definition of the driver for autoconfig. */ 166 int zs_hb_match(struct device *, struct cfdata *, void *); 167 void zs_hb_attach(struct device *, struct device *, void *); 168 169 CFATTACH_DECL(zsc_hb, sizeof(struct zsc_softc), 170 zs_hb_match, zs_hb_attach, NULL, NULL); 171 172 /* 173 * Is the zs chip present? 174 */ 175 int 176 zs_hb_match(struct device *parent, struct cfdata *cf, void *aux) 177 { 178 struct hb_attach_args *ha = aux; 179 180 if (strcmp(ha->ha_name, "zsc")) 181 return 0; 182 183 /* This returns -1 on a fault (bus error). */ 184 if (hb_badaddr((char *)ha->ha_addr, 1)) 185 return 0; 186 187 return 1; 188 } 189 190 /* 191 * Attach a found zs. 192 * 193 * Match slave number to zs unit number, so that misconfiguration will 194 * not set up the keyboard as ttya, etc. 195 */ 196 void 197 zs_hb_attach(struct device *parent, struct device *self, void *aux) 198 { 199 struct zsc_softc *zsc = (void *)self; 200 struct hb_attach_args *ha = aux; 201 struct zsc_attach_args zsc_args; 202 volatile struct zschan *zc; 203 struct zs_chanstate *cs; 204 int s, zs_unit, channel, intlevel; 205 static int didintr; 206 207 zs_unit = device_unit(&zsc->zsc_dev); 208 intlevel = ha->ha_level; 209 zsaddr[zs_unit] = (void *)ha->ha_addr; 210 211 if (intlevel == -1) { 212 #if 0 213 printf(": interrupt level not configured\n"); 214 return; 215 #else 216 printf(": interrupt level not configured; using"); 217 intlevel = 1; 218 #endif 219 } 220 221 printf(" level %d\n", intlevel); 222 223 zs_delay = zs_hb_delay; 224 225 /* 226 * Initialize software state for each channel. 227 */ 228 for (channel = 0; channel < 2; channel++) { 229 zsc_args.channel = channel; 230 zsc_args.hwflags = zs_hwflags[zs_unit][channel]; 231 cs = &zsc->zsc_cs_store[channel]; 232 zsc->zsc_cs[channel] = cs; 233 234 zs_lock_init(cs); 235 cs->cs_channel = channel; 236 cs->cs_private = NULL; 237 cs->cs_ops = &zsops_null; 238 if ((device_cfdata(&zsc->zsc_dev)->cf_flags & ZSCFLAG_EX) == 0) 239 cs->cs_brg_clk = PCLK / 16; 240 else 241 cs->cs_brg_clk = PCLK_EX / 16; 242 243 zc = zs_get_chan_addr(zs_unit, channel); 244 cs->cs_reg_csr = &zc->zc_csr; 245 cs->cs_reg_data = &zc->zc_data; 246 247 memcpy(cs->cs_creg, zs_init_reg, 16); 248 memcpy(cs->cs_preg, zs_init_reg, 16); 249 250 /* XXX: Get these from the EEPROM instead? */ 251 /* XXX: See the mvme167 code. Better. */ 252 if (zsc_args.hwflags & ZS_HWFLAG_CONSOLE) 253 cs->cs_defspeed = zs_get_speed(cs); 254 else 255 cs->cs_defspeed = zs_defspeed; 256 cs->cs_defcflag = zs_def_cflag; 257 258 /* Make these correspond to cs_defcflag (-crtscts) */ 259 cs->cs_rr0_dcd = ZSRR0_DCD; 260 cs->cs_rr0_cts = 0; 261 cs->cs_wr5_dtr = ZSWR5_DTR | ZSWR5_RTS; 262 cs->cs_wr5_rts = 0; 263 264 /* 265 * Clear the master interrupt enable. 266 * The INTENA is common to both channels, 267 * so just do it on the A channel. 268 */ 269 if (channel == 0) { 270 zs_write_reg(cs, 9, 0); 271 } 272 273 /* 274 * Look for a child driver for this channel. 275 * The child attach will setup the hardware. 276 */ 277 if (!config_found(self, (void *)&zsc_args, zs_print)) { 278 /* No sub-driver. Just reset it. */ 279 u_char reset = (channel == 0) ? 280 ZSWR9_A_RESET : ZSWR9_B_RESET; 281 s = splhigh(); 282 zs_write_reg(cs, 9, reset); 283 splx(s); 284 } 285 } 286 287 /* 288 * Now safe to install interrupt handlers. Note the arguments 289 * to the interrupt handlers aren't used. Note, we only do this 290 * once since both SCCs interrupt at the same level and vector. 291 */ 292 if (!didintr) { 293 didintr = 1; 294 295 zsc->zsc_si = softintr_establish(IPL_SOFTSERIAL, zssoft, zsc); 296 hb_intr_establish(intlevel, INTST1_SCC, IPL_SERIAL, 297 zshard_hb, NULL); 298 } 299 /* XXX; evcnt_attach() ? */ 300 301 /* 302 * Set the master interrupt enable and interrupt vector. 303 * (common to both channels, do it on A) 304 */ 305 cs = zsc->zsc_cs[0]; 306 s = splhigh(); 307 /* interrupt vector */ 308 zs_write_reg(cs, 2, zs_init_reg[2]); 309 /* master interrupt control (enable) */ 310 zs_write_reg(cs, 9, zs_init_reg[9]); 311 splx(s); 312 } 313 314 static int 315 zshard_hb(void *arg) 316 { 317 int rv; 318 319 (void) *(volatile u_char *)SCCVECT; 320 rv = zshard(arg); 321 322 /* XXX news3400 sometimes losts zs interrupt */ 323 if (rv) 324 zshard(arg); 325 326 return rv; 327 } 328 329 /* 330 * Polled input char. 331 */ 332 int 333 zs_getc(void *arg) 334 { 335 volatile struct zschan *zc = arg; 336 int s, c, rr0; 337 338 s = splhigh(); 339 /* Wait for a character to arrive. */ 340 do { 341 rr0 = zc->zc_csr; 342 ZS_DELAY(); 343 } while ((rr0 & ZSRR0_RX_READY) == 0); 344 345 c = zc->zc_data; 346 ZS_DELAY(); 347 splx(s); 348 349 /* 350 * This is used by the kd driver to read scan codes, 351 * so don't translate '\r' ==> '\n' here... 352 */ 353 return c; 354 } 355 356 /* 357 * Polled output char. 358 */ 359 void 360 zs_putc(void *arg, int c) 361 { 362 volatile struct zschan *zc = arg; 363 int s, rr0; 364 365 s = splhigh(); 366 /* Wait for transmitter to become ready. */ 367 do { 368 rr0 = zc->zc_csr; 369 ZS_DELAY(); 370 } while ((rr0 & ZSRR0_TX_READY) == 0); 371 372 zc->zc_data = c; 373 ZS_DELAY(); 374 splx(s); 375 } 376 377 /*****************************************************************/ 378 379 static void zscnprobe(struct consdev *); 380 static void zscninit(struct consdev *); 381 static int zscngetc(dev_t); 382 static void zscnputc(dev_t, int); 383 384 struct consdev consdev_zs = { 385 zscnprobe, 386 zscninit, 387 zscngetc, 388 zscnputc, 389 nullcnpollc, 390 NULL, 391 NULL, 392 NULL, 393 NODEV, 394 CN_DEAD 395 }; 396 397 static void 398 zscnprobe(struct consdev *cn) 399 { 400 } 401 402 static void 403 zscninit(struct consdev *cn) 404 { 405 extern const struct cdevsw zstty_cdevsw; 406 407 cn->cn_dev = makedev(cdevsw_lookup_major(&zstty_cdevsw), 0); 408 cn->cn_pri = CN_REMOTE; 409 zs_hwflags[0][0] = ZS_HWFLAG_CONSOLE; 410 } 411 412 static int 413 zscngetc(dev_t dev) 414 { 415 416 return zs_getc((void *)SCCPORT0A); 417 } 418 419 static void 420 zscnputc(dev_t dev, int c) 421 { 422 423 zs_putc((void *)SCCPORT0A, c); 424 } 425
Indexes created Tue Sep 30 07:10:03 GMT 2025