1 /* $NetBSD: zs_hb.c,v 1.30 2023/10/25 12:59:09 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 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * Zilog Z8530 Dual UART driver (machine-dependent part) 34 * 35 * Runs two serial lines per chip using slave drivers. 36 * Plain tty/async lines use the zs_async slave. 37 * Sun keyboard/mouse uses the zs_kbd/zs_ms slaves. 38 */ 39 40 #include <sys/cdefs.h> 41 __KERNEL_RCSID(0, "$NetBSD: zs_hb.c,v 1.30 2023/10/25 12:59:09 tsutsui Exp $"); 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/device.h> 46 #include <sys/tty.h> 47 #include <sys/conf.h> 48 #include <sys/cpu.h> 49 #include <sys/intr.h> 50 51 #include <mips/locore.h> 52 53 #include <machine/adrsmap.h> 54 #include <machine/z8530var.h> 55 56 #include <dev/cons.h> 57 #include <dev/ic/z8530reg.h> 58 59 #include <newsmips/dev/hbvar.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 uint8_t zc_csr; /* ctrl,status, and indirect access */ 88 volatile uint8_t 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 98 static struct zsdevice *zsaddr[NZS]; 99 100 /* Flags from cninit() */ 101 static int zs_hwflags[NZS][2]; 102 103 /* Default speed for all channels */ 104 static int zs_defspeed = 9600; 105 106 static uint8_t zs_init_reg[16] = { 107 0, /* 0: CMD (reset, etc.) */ 108 0, /* 1: No interrupts yet. */ 109 ZSHARD_PRI, /* IVECT */ 110 ZSWR3_RX_8 | ZSWR3_RX_ENABLE, 111 ZSWR4_CLK_X16 | ZSWR4_ONESB | ZSWR4_EVENP, 112 ZSWR5_TX_8 | ZSWR5_TX_ENABLE, 113 0, /* 6: TXSYNC/SYNCLO */ 114 0, /* 7: RXSYNC/SYNCHI */ 115 0, /* 8: alias for data port */ 116 ZSWR9_MASTER_IE, 117 0, /*10: Misc. TX/RX control bits */ 118 ZSWR11_TXCLK_BAUD | ZSWR11_RXCLK_BAUD, 119 ((PCLK/32)/9600)-2, /*12: BAUDLO (default=9600) */ 120 0, /*13: BAUDHI (default=9600) */ 121 ZSWR14_BAUD_ENA | ZSWR14_BAUD_FROM_PCLK, 122 ZSWR15_BREAK_IE, 123 }; 124 125 static struct zschan * zs_get_chan_addr(int, int); 126 static void zs_hb_delay(void); 127 static int zshard_hb(void *); 128 static int zs_getc(void *); 129 static void zs_putc(void *, int); 130 131 struct zschan * 132 zs_get_chan_addr(int zs_unit, int channel) 133 { 134 struct zsdevice *addr; 135 struct zschan *zc; 136 137 if (zs_unit >= NZS) 138 return NULL; 139 addr = zsaddr[zs_unit]; 140 if (addr == NULL) 141 return NULL; 142 if (channel == 0) { 143 zc = &addr->zs_chan_a; 144 } else { 145 zc = &addr->zs_chan_b; 146 } 147 return zc; 148 } 149 150 static void 151 zs_hb_delay(void) 152 { 153 154 ZS_DELAY(); 155 } 156 157 /**************************************************************** 158 * Autoconfig 159 ****************************************************************/ 160 161 /* Definition of the driver for autoconfig. */ 162 int zs_hb_match(device_t, cfdata_t, void *); 163 void zs_hb_attach(device_t, device_t, void *); 164 165 CFATTACH_DECL_NEW(zsc_hb, sizeof(struct zsc_softc), 166 zs_hb_match, zs_hb_attach, NULL, NULL); 167 168 /* 169 * Is the zs chip present? 170 */ 171 int 172 zs_hb_match(device_t parent, cfdata_t cf, void *aux) 173 { 174 struct hb_attach_args *ha = aux; 175 176 if (strcmp(ha->ha_name, "zsc")) 177 return 0; 178 179 /* This returns -1 on a fault (bus error). */ 180 if (hb_badaddr((char *)ha->ha_addr, 1)) 181 return 0; 182 183 return 1; 184 } 185 186 /* 187 * Attach a found zs. 188 * 189 * Match slave number to zs unit number, so that misconfiguration will 190 * not set up the keyboard as ttya, etc. 191 */ 192 void 193 zs_hb_attach(device_t parent, device_t self, void *aux) 194 { 195 struct zsc_softc *zsc = device_private(self); 196 struct hb_attach_args *ha = aux; 197 struct zsc_attach_args zsc_args; 198 volatile struct zschan *zc; 199 struct zs_chanstate *cs; 200 int s, zs_unit, channel, intlevel; 201 202 zsc->zsc_dev = self; 203 zs_unit = device_unit(self); 204 intlevel = ha->ha_level; 205 zsaddr[zs_unit] = (void *)ha->ha_addr; 206 207 if (intlevel == -1) { 208 #if 0 209 aprint_error(": interrupt level not configured\n"); 210 return; 211 #else 212 aprint_error(": interrupt level not configured; using"); 213 intlevel = 1; 214 #endif 215 } 216 217 aprint_normal(" level %d\n", intlevel); 218 219 zs_delay = zs_hb_delay; 220 221 /* 222 * Initialize software state for each channel. 223 */ 224 for (channel = 0; channel < 2; channel++) { 225 zsc_args.channel = channel; 226 zsc_args.hwflags = zs_hwflags[zs_unit][channel]; 227 cs = &zsc->zsc_cs_store[channel]; 228 zsc->zsc_cs[channel] = cs; 229 230 zs_lock_init(cs); 231 cs->cs_channel = channel; 232 cs->cs_private = NULL; 233 cs->cs_ops = &zsops_null; 234 if ((device_cfdata(self)->cf_flags & ZSCFLAG_EX) == 0) 235 cs->cs_brg_clk = PCLK / 16; 236 else 237 cs->cs_brg_clk = PCLK_EX / 16; 238 239 zc = zs_get_chan_addr(zs_unit, channel); 240 cs->cs_reg_csr = &zc->zc_csr; 241 cs->cs_reg_data = &zc->zc_data; 242 243 memcpy(cs->cs_creg, zs_init_reg, 16); 244 memcpy(cs->cs_preg, zs_init_reg, 16); 245 246 /* XXX: Get these from the EEPROM instead? */ 247 /* XXX: See the mvme167 code. Better. */ 248 if (zsc_args.hwflags & ZS_HWFLAG_CONSOLE) 249 cs->cs_defspeed = zs_get_speed(cs); 250 else 251 cs->cs_defspeed = zs_defspeed; 252 cs->cs_defcflag = zs_def_cflag; 253 254 /* Make these correspond to cs_defcflag (-crtscts) */ 255 cs->cs_rr0_dcd = ZSRR0_DCD; 256 cs->cs_rr0_cts = 0; 257 cs->cs_wr5_dtr = ZSWR5_DTR | ZSWR5_RTS; 258 cs->cs_wr5_rts = 0; 259 260 /* 261 * Clear the master interrupt enable. 262 * The INTENA is common to both channels, 263 * so just do it on the A channel. 264 */ 265 if (channel == 0) { 266 zs_write_reg(cs, 9, 0); 267 } 268 269 /* 270 * Look for a child driver for this channel. 271 * The child attach will setup the hardware. 272 */ 273 if (!config_found(self, (void *)&zsc_args, zs_print, 274 CFARGS_NONE)) { 275 /* No sub-driver. Just reset it. */ 276 uint8_t reset = (channel == 0) ? 277 ZSWR9_A_RESET : ZSWR9_B_RESET; 278 s = splhigh(); 279 zs_write_reg(cs, 9, reset); 280 splx(s); 281 } 282 } 283 284 /* 285 * Now safe to install interrupt handlers. Note the arguments 286 * to the interrupt handlers aren't used. Note, we only do this 287 * once since both SCCs interrupt at the same level and vector. 288 */ 289 zsc->zsc_si = softint_establish(SOFTINT_SERIAL, 290 (void (*)(void *))zsc_intr_soft, zsc); 291 hb_intr_establish(intlevel, INTST1_SCC, IPL_SERIAL, zshard_hb, zsc); 292 /* XXX; evcnt_attach() ? */ 293 294 /* 295 * Set the master interrupt enable and interrupt vector. 296 * (common to both channels, do it on A) 297 */ 298 cs = zsc->zsc_cs[0]; 299 s = splhigh(); 300 /* interrupt vector */ 301 zs_write_reg(cs, 2, zs_init_reg[2]); 302 /* master interrupt control (enable) */ 303 zs_write_reg(cs, 9, zs_init_reg[9]); 304 splx(s); 305 } 306 307 static int 308 zshard_hb(void *arg) 309 { 310 int rv; 311 312 (void) *(volatile u_char *)SCCVECT; 313 rv = zshard(arg); 314 315 /* XXX news3400 sometimes losts zs interrupt */ 316 if (rv) 317 zshard(arg); 318 319 return rv; 320 } 321 322 /* 323 * Polled input char. 324 */ 325 int 326 zs_getc(void *arg) 327 { 328 volatile struct zschan *zc = arg; 329 int s, c, rr0; 330 331 s = splhigh(); 332 /* Wait for a character to arrive. */ 333 do { 334 rr0 = zc->zc_csr; 335 ZS_DELAY(); 336 } while ((rr0 & ZSRR0_RX_READY) == 0); 337 338 c = zc->zc_data; 339 ZS_DELAY(); 340 splx(s); 341 342 /* 343 * This is used by the kd driver to read scan codes, 344 * so don't translate '\r' ==> '\n' here... 345 */ 346 return c; 347 } 348 349 /* 350 * Polled output char. 351 */ 352 void 353 zs_putc(void *arg, int c) 354 { 355 volatile struct zschan *zc = arg; 356 int s, rr0; 357 358 s = splhigh(); 359 /* Wait for transmitter to become ready. */ 360 do { 361 rr0 = zc->zc_csr; 362 ZS_DELAY(); 363 } while ((rr0 & ZSRR0_TX_READY) == 0); 364 365 zc->zc_data = c; 366 ZS_DELAY(); 367 splx(s); 368 } 369 370 /*****************************************************************/ 371 372 static void zscnprobe(struct consdev *); 373 static void zscninit(struct consdev *); 374 static int zscngetc(dev_t); 375 static void zscnputc(dev_t, int); 376 377 struct consdev consdev_zs = { 378 zscnprobe, 379 zscninit, 380 zscngetc, 381 zscnputc, 382 nullcnpollc, 383 NULL, 384 NULL, 385 NULL, 386 NODEV, 387 CN_DEAD 388 }; 389 390 static void 391 zscnprobe(struct consdev *cn) 392 { 393 } 394 395 static void 396 zscninit(struct consdev *cn) 397 { 398 extern const struct cdevsw zstty_cdevsw; 399 400 cn->cn_dev = makedev(cdevsw_lookup_major(&zstty_cdevsw), 0); 401 cn->cn_pri = CN_REMOTE; 402 zs_hwflags[0][0] = ZS_HWFLAG_CONSOLE; 403 } 404 405 static int 406 zscngetc(dev_t dev) 407 { 408 409 return zs_getc((void *)SCCPORT0A); 410 } 411 412 static void 413 zscnputc(dev_t dev, int c) 414 { 415 416 zs_putc((void *)SCCPORT0A, c); 417 } 418
Indexes created Wed Sep 24 22:09:59 GMT 2025