zs_hb.c revision 1.26
1 /* $NetBSD: zs_hb.c,v 1.26 2010/06/26 03:44:49 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 1.26 2010/06/26 03:44:49 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 <machine/adrsmap.h> 52 #include <machine/z8530var.h> 53 54 #include <dev/cons.h> 55 #include <dev/ic/z8530reg.h> 56 57 #include <newsmips/dev/hbvar.h> 58 59 #include "zsc.h" /* NZSC */ 60 #define NZS NZSC 61 62 /* Make life easier for the initialized arrays here. */ 63 #if NZS < 2 64 #undef NZS 65 #define NZS 2 66 #endif 67 68 #define ZSCFLAG_EX 0x01 /* expansion board */ 69 70 /* 71 * The news3400 provides a 4.9152 MHz clock to the ZS chips. 72 */ 73 #define PCLK (9600 * 512) /* PCLK pin input clock rate */ 74 #define PCLK_EX (9600 * 384) 75 76 /* 77 * Define interrupt levels. 78 */ 79 #define ZSHARD_PRI 64 80 81 #define ZS_DELAY() {(void)*(volatile char *)INTEN1; delay(2);} 82 83 /* The layout of this is hardware-dependent (padding, order). */ 84 struct zschan { 85 volatile uint8_t zc_csr; /* ctrl,status, and indirect access */ 86 volatile uint8_t zc_data; /* data */ 87 }; 88 struct zsdevice { 89 /* Yes, they are backwards. */ 90 struct zschan zs_chan_b; 91 struct zschan zs_chan_a; 92 }; 93 94 extern int zs_def_cflag; 95 96 static struct zsdevice *zsaddr[NZS]; 97 98 /* Flags from cninit() */ 99 static int zs_hwflags[NZS][2]; 100 101 /* Default speed for all channels */ 102 static int zs_defspeed = 9600; 103 104 static uint8_t zs_init_reg[16] = { 105 0, /* 0: CMD (reset, etc.) */ 106 0, /* 1: No interrupts yet. */ 107 ZSHARD_PRI, /* IVECT */ 108 ZSWR3_RX_8 | ZSWR3_RX_ENABLE, 109 ZSWR4_CLK_X16 | ZSWR4_ONESB | ZSWR4_EVENP, 110 ZSWR5_TX_8 | ZSWR5_TX_ENABLE, 111 0, /* 6: TXSYNC/SYNCLO */ 112 0, /* 7: RXSYNC/SYNCHI */ 113 0, /* 8: alias for data port */ 114 ZSWR9_MASTER_IE, 115 0, /*10: Misc. TX/RX control bits */ 116 ZSWR11_TXCLK_BAUD | ZSWR11_RXCLK_BAUD, 117 ((PCLK/32)/9600)-2, /*12: BAUDLO (default=9600) */ 118 0, /*13: BAUDHI (default=9600) */ 119 ZSWR14_BAUD_ENA | ZSWR14_BAUD_FROM_PCLK, 120 ZSWR15_BREAK_IE, 121 }; 122 123 static struct zschan * zs_get_chan_addr(int, int); 124 static void zs_hb_delay(void); 125 static int zshard_hb(void *); 126 static int zs_getc(void *); 127 static void zs_putc(void *, int); 128 129 struct zschan * 130 zs_get_chan_addr(int zs_unit, int channel) 131 { 132 struct zsdevice *addr; 133 struct zschan *zc; 134 135 if (zs_unit >= NZS) 136 return NULL; 137 addr = zsaddr[zs_unit]; 138 if (addr == NULL) 139 return NULL; 140 if (channel == 0) { 141 zc = &addr->zs_chan_a; 142 } else { 143 zc = &addr->zs_chan_b; 144 } 145 return zc; 146 } 147 148 static void 149 zs_hb_delay(void) 150 { 151 152 ZS_DELAY(); 153 } 154 155 /**************************************************************** 156 * Autoconfig 157 ****************************************************************/ 158 159 /* Definition of the driver for autoconfig. */ 160 int zs_hb_match(device_t, cfdata_t, void *); 161 void zs_hb_attach(device_t, device_t, void *); 162 163 CFATTACH_DECL_NEW(zsc_hb, sizeof(struct zsc_softc), 164 zs_hb_match, zs_hb_attach, NULL, NULL); 165 166 /* 167 * Is the zs chip present? 168 */ 169 int 170 zs_hb_match(device_t parent, cfdata_t cf, void *aux) 171 { 172 struct hb_attach_args *ha = aux; 173 174 if (strcmp(ha->ha_name, "zsc")) 175 return 0; 176 177 /* This returns -1 on a fault (bus error). */ 178 if (hb_badaddr((char *)ha->ha_addr, 1)) 179 return 0; 180 181 return 1; 182 } 183 184 /* 185 * Attach a found zs. 186 * 187 * Match slave number to zs unit number, so that misconfiguration will 188 * not set up the keyboard as ttya, etc. 189 */ 190 void 191 zs_hb_attach(device_t parent, device_t self, void *aux) 192 { 193 struct zsc_softc *zsc = device_private(self); 194 struct hb_attach_args *ha = aux; 195 struct zsc_attach_args zsc_args; 196 volatile struct zschan *zc; 197 struct zs_chanstate *cs; 198 int s, zs_unit, channel, intlevel; 199 200 zsc->zsc_dev = self; 201 zs_unit = device_unit(self); 202 intlevel = ha->ha_level; 203 zsaddr[zs_unit] = (void *)ha->ha_addr; 204 205 if (intlevel == -1) { 206 #if 0 207 aprint_error(": interrupt level not configured\n"); 208 return; 209 #else 210 aprint_error(": interrupt level not configured; using"); 211 intlevel = 1; 212 #endif 213 } 214 215 aprint_error(" level %d\n", intlevel); 216 217 zs_delay = zs_hb_delay; 218 219 /* 220 * Initialize software state for each channel. 221 */ 222 for (channel = 0; channel < 2; channel++) { 223 zsc_args.channel = channel; 224 zsc_args.hwflags = zs_hwflags[zs_unit][channel]; 225 cs = &zsc->zsc_cs_store[channel]; 226 zsc->zsc_cs[channel] = cs; 227 228 zs_lock_init(cs); 229 cs->cs_channel = channel; 230 cs->cs_private = NULL; 231 cs->cs_ops = &zsops_null; 232 if ((device_cfdata(self)->cf_flags & ZSCFLAG_EX) == 0) 233 cs->cs_brg_clk = PCLK / 16; 234 else 235 cs->cs_brg_clk = PCLK_EX / 16; 236 237 zc = zs_get_chan_addr(zs_unit, channel); 238 cs->cs_reg_csr = &zc->zc_csr; 239 cs->cs_reg_data = &zc->zc_data; 240 241 memcpy(cs->cs_creg, zs_init_reg, 16); 242 memcpy(cs->cs_preg, zs_init_reg, 16); 243 244 /* XXX: Get these from the EEPROM instead? */ 245 /* XXX: See the mvme167 code. Better. */ 246 if (zsc_args.hwflags & ZS_HWFLAG_CONSOLE) 247 cs->cs_defspeed = zs_get_speed(cs); 248 else 249 cs->cs_defspeed = zs_defspeed; 250 cs->cs_defcflag = zs_def_cflag; 251 252 /* Make these correspond to cs_defcflag (-crtscts) */ 253 cs->cs_rr0_dcd = ZSRR0_DCD; 254 cs->cs_rr0_cts = 0; 255 cs->cs_wr5_dtr = ZSWR5_DTR | ZSWR5_RTS; 256 cs->cs_wr5_rts = 0; 257 258 /* 259 * Clear the master interrupt enable. 260 * The INTENA is common to both channels, 261 * so just do it on the A channel. 262 */ 263 if (channel == 0) { 264 zs_write_reg(cs, 9, 0); 265 } 266 267 /* 268 * Look for a child driver for this channel. 269 * The child attach will setup the hardware. 270 */ 271 if (!config_found(self, (void *)&zsc_args, zs_print)) { 272 /* No sub-driver. Just reset it. */ 273 uint8_t reset = (channel == 0) ? 274 ZSWR9_A_RESET : ZSWR9_B_RESET; 275 s = splhigh(); 276 zs_write_reg(cs, 9, reset); 277 splx(s); 278 } 279 } 280 281 /* 282 * Now safe to install interrupt handlers. Note the arguments 283 * to the interrupt handlers aren't used. Note, we only do this 284 * once since both SCCs interrupt at the same level and vector. 285 */ 286 zsc->zsc_si = softint_establish(SOFTINT_SERIAL, 287 (void (*)(void *))zsc_intr_soft, zsc); 288 hb_intr_establish(intlevel, INTST1_SCC, IPL_SERIAL, zshard_hb, zsc); 289 /* XXX; evcnt_attach() ? */ 290 291 /* 292 * Set the master interrupt enable and interrupt vector. 293 * (common to both channels, do it on A) 294 */ 295 cs = zsc->zsc_cs[0]; 296 s = splhigh(); 297 /* interrupt vector */ 298 zs_write_reg(cs, 2, zs_init_reg[2]); 299 /* master interrupt control (enable) */ 300 zs_write_reg(cs, 9, zs_init_reg[9]); 301 splx(s); 302 } 303 304 static int 305 zshard_hb(void *arg) 306 { 307 int rv; 308 309 (void) *(volatile u_char *)SCCVECT; 310 rv = zshard(arg); 311 312 /* XXX news3400 sometimes losts zs interrupt */ 313 if (rv) 314 zshard(arg); 315 316 return rv; 317 } 318 319 /* 320 * Polled input char. 321 */ 322 int 323 zs_getc(void *arg) 324 { 325 volatile struct zschan *zc = arg; 326 int s, c, rr0; 327 328 s = splhigh(); 329 /* Wait for a character to arrive. */ 330 do { 331 rr0 = zc->zc_csr; 332 ZS_DELAY(); 333 } while ((rr0 & ZSRR0_RX_READY) == 0); 334 335 c = zc->zc_data; 336 ZS_DELAY(); 337 splx(s); 338 339 /* 340 * This is used by the kd driver to read scan codes, 341 * so don't translate '\r' ==> '\n' here... 342 */ 343 return c; 344 } 345 346 /* 347 * Polled output char. 348 */ 349 void 350 zs_putc(void *arg, int c) 351 { 352 volatile struct zschan *zc = arg; 353 int s, rr0; 354 355 s = splhigh(); 356 /* Wait for transmitter to become ready. */ 357 do { 358 rr0 = zc->zc_csr; 359 ZS_DELAY(); 360 } while ((rr0 & ZSRR0_TX_READY) == 0); 361 362 zc->zc_data = c; 363 ZS_DELAY(); 364 splx(s); 365 } 366 367 /*****************************************************************/ 368 369 static void zscnprobe(struct consdev *); 370 static void zscninit(struct consdev *); 371 static int zscngetc(dev_t); 372 static void zscnputc(dev_t, int); 373 374 struct consdev consdev_zs = { 375 zscnprobe, 376 zscninit, 377 zscngetc, 378 zscnputc, 379 nullcnpollc, 380 NULL, 381 NULL, 382 NULL, 383 NODEV, 384 CN_DEAD 385 }; 386 387 static void 388 zscnprobe(struct consdev *cn) 389 { 390 } 391 392 static void 393 zscninit(struct consdev *cn) 394 { 395 extern const struct cdevsw zstty_cdevsw; 396 397 cn->cn_dev = makedev(cdevsw_lookup_major(&zstty_cdevsw), 0); 398 cn->cn_pri = CN_REMOTE; 399 zs_hwflags[0][0] = ZS_HWFLAG_CONSOLE; 400 } 401 402 static int 403 zscngetc(dev_t dev) 404 { 405 406 return zs_getc((void *)SCCPORT0A); 407 } 408 409 static void 410 zscnputc(dev_t dev, int c) 411 { 412 413 zs_putc((void *)SCCPORT0A, c); 414 } 415
Indexes created Tue Sep 30 11:09:46 GMT 2025