1 /* $NetBSD: kbd_zs.c,v 1.24 2022/09/25 21:30:29 thorpej Exp $ */ 2 3 /* 4 * Copyright (c) 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This software was developed by the Computer Systems Engineering group 8 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 9 * contributed to Berkeley. 10 * 11 * All advertising materials mentioning features or use of this software 12 * must display the following acknowledgement: 13 * This product includes software developed by the University of 14 * California, Lawrence Berkeley Laboratory. 15 * 16 * Redistribution and use in source and binary forms, with or without 17 * modification, are permitted provided that the following conditions 18 * are met: 19 * 1. Redistributions of source code must retain the above copyright 20 * notice, this list of conditions and the following disclaimer. 21 * 2. Redistributions in binary form must reproduce the above copyright 22 * notice, this list of conditions and the following disclaimer in the 23 * documentation and/or other materials provided with the distribution. 24 * 3. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * @(#)kbd.c 8.2 (Berkeley) 10/30/93 41 */ 42 43 /* 44 * /dev/kbd lower layer for sun keyboard off a zs channel. 45 * This driver uses kbdsun middle layer to hook up to /dev/kbd. 46 */ 47 48 /* 49 * Zilog Z8530 Dual UART driver (keyboard interface) 50 * 51 * This is the 8530 portion of the driver that will be attached to 52 * the "zsc" driver for a Sun keyboard. 53 */ 54 55 #include <sys/cdefs.h> 56 __KERNEL_RCSID(0, "$NetBSD: kbd_zs.c,v 1.24 2022/09/25 21:30:29 thorpej Exp $"); 57 58 #include <sys/param.h> 59 #include <sys/systm.h> 60 #include <sys/conf.h> 61 #include <sys/device.h> 62 #include <sys/kernel.h> 63 #include <sys/proc.h> 64 #include <sys/signal.h> 65 #include <sys/signalvar.h> 66 #include <sys/time.h> 67 #include <sys/select.h> 68 #include <sys/syslog.h> 69 70 #include <dev/ic/z8530reg.h> 71 #include <machine/z8530var.h> 72 #include <dev/sun/vuid_event.h> 73 #include <dev/sun/event_var.h> 74 #include <dev/sun/kbd_reg.h> 75 #include <dev/sun/kbd_xlate.h> 76 #include <dev/sun/kbdvar.h> 77 #include <dev/sun/kbdsunvar.h> 78 79 #if NWSKBD > 0 80 void kbd_wskbd_attach(struct kbd_softc *k, int isconsole); 81 #endif 82 83 /**************************************************************** 84 * Interface to the lower layer (zscc) 85 ****************************************************************/ 86 87 static void kbd_zs_rxint(struct zs_chanstate *); 88 static void kbd_zs_stint(struct zs_chanstate *, int); 89 static void kbd_zs_txint(struct zs_chanstate *); 90 static void kbd_zs_softint(struct zs_chanstate *); 91 92 struct zsops zsops_kbd = { 93 kbd_zs_rxint, /* receive char available */ 94 kbd_zs_stint, /* external/status */ 95 kbd_zs_txint, /* xmit buffer empty */ 96 kbd_zs_softint, /* process software interrupt */ 97 }; 98 99 static int kbd_zs_match(device_t, cfdata_t, void *); 100 static void kbd_zs_attach(device_t, device_t, void *); 101 static void kbd_zs_write_data(struct kbd_sun_softc *, int); 102 103 CFATTACH_DECL_NEW(kbd_zs, sizeof(struct kbd_sun_softc), 104 kbd_zs_match, kbd_zs_attach, NULL, NULL); 105 106 /* Fall-back baud rate */ 107 int kbd_zs_bps = KBD_DEFAULT_BPS; 108 109 /* 110 * kbd_zs_match: how is this zs channel configured? 111 */ 112 int 113 kbd_zs_match(device_t parent, cfdata_t cf, void *aux) 114 { 115 struct zsc_attach_args *args = aux; 116 117 /* Exact match required for keyboard. */ 118 if (cf->cf_loc[ZSCCF_CHANNEL] == args->channel) 119 return 2; 120 121 return 0; 122 } 123 124 void 125 kbd_zs_attach(device_t parent, device_t self, void *aux) 126 { 127 struct kbd_sun_softc *k = device_private(self); 128 struct zsc_softc *zsc = device_private(parent); 129 struct zsc_attach_args *args = aux; 130 struct zs_chanstate *cs; 131 int channel; 132 int reset, s; 133 int bps; 134 135 k->k_kbd.k_dev = self; 136 137 /* provide upper layer with a link to the middle layer */ 138 k->k_kbd.k_ops = &kbd_ops_sun; 139 140 /* provide middle layer with a link to the lower layer (i.e. us) */ 141 channel = args->channel; 142 cs = zsc->zsc_cs[channel]; 143 cs->cs_private = k; 144 cs->cs_ops = &zsops_kbd; 145 k->k_cs = cs; 146 k->k_write_data = kbd_zs_write_data; 147 148 if ((bps = cs->cs_defspeed) == 0) 149 bps = kbd_zs_bps; 150 151 aprint_normal(": baud rate %d", bps); 152 153 if ((args->hwflags & ZS_HWFLAG_CONSOLE_INPUT) != 0) { 154 /* 155 * Hookup ourselves as the console input channel 156 */ 157 struct cons_channel *cc = kbd_cc_alloc(&k->k_kbd); 158 159 if (cc == NULL) 160 return; 161 162 cons_attach_input(cc, args->consdev); 163 k->k_kbd.k_isconsole = 1; 164 aprint_normal(" (console input)"); 165 } 166 aprint_normal("\n"); 167 168 /* Initialize the speed, etc. */ 169 s = splzs(); 170 if (k->k_kbd.k_isconsole == 0) { 171 /* Not the console; may need reset. */ 172 reset = (channel == 0) ? 173 ZSWR9_A_RESET : ZSWR9_B_RESET; 174 zs_write_reg(cs, 9, reset); 175 } 176 /* These are OK as set by zscc: WR3, WR4, WR5 */ 177 /* We don't care about status interrupts. */ 178 cs->cs_preg[1] = ZSWR1_RIE | ZSWR1_TIE; 179 (void) zs_set_speed(cs, bps); 180 zs_loadchannelregs(cs); 181 splx(s); 182 183 /* Do this before any calls to kbd_rint(). */ 184 kbd_xlate_init(&k->k_kbd.k_state); 185 186 /* Magic sequence. */ 187 k->k_magic1 = KBD_L1; 188 k->k_magic2 = KBD_A; 189 #if NWSKBD > 0 190 kbd_wskbd_attach(&k->k_kbd, k->k_kbd.k_isconsole); 191 #endif 192 } 193 194 /* 195 * used by kbd_sun_start_tx(); 196 */ 197 void 198 kbd_zs_write_data(struct kbd_sun_softc *k, int c) 199 { 200 int s; 201 202 /* Need splzs to avoid interruption of the delay. */ 203 s = splzs(); 204 zs_write_data(k->k_cs, c); 205 splx(s); 206 } 207 208 static void 209 kbd_zs_rxint(struct zs_chanstate *cs) 210 { 211 struct kbd_sun_softc *k; 212 int put, put_next; 213 uint8_t c, rr1; 214 215 k = cs->cs_private; 216 put = k->k_rbput; 217 218 /* 219 * First read the status, because reading the received char 220 * destroys the status of this char. 221 */ 222 rr1 = zs_read_reg(cs, 1); 223 c = zs_read_data(cs); 224 225 if (rr1 & (ZSRR1_FE | ZSRR1_DO | ZSRR1_PE)) { 226 /* Clear the receive error. */ 227 zs_write_csr(cs, ZSWR0_RESET_ERRORS); 228 } 229 230 /* 231 * Check NOW for a console abort sequence, so that we can 232 * abort even when interrupts are locking up the machine. 233 */ 234 if (k->k_magic1_down) { 235 /* The last keycode was "MAGIC1" down. */ 236 k->k_magic1_down = 0; 237 if (c == k->k_magic2) { 238 /* Magic "L1-A" sequence; enter debugger. */ 239 if (k->k_kbd.k_isconsole) { 240 zs_abort(cs); 241 /* Debugger done. Fake L1-up to finish it. */ 242 c = k->k_magic1 | KBD_UP; 243 } else { 244 printf("%s: magic sequence, but not console\n", 245 device_xname(k->k_kbd.k_dev)); 246 } 247 } 248 } 249 if (c == k->k_magic1) { 250 k->k_magic1_down = 1; 251 } 252 253 k->k_rbuf[put] = (c << 8) | rr1; 254 put_next = (put + 1) & KBD_RX_RING_MASK; 255 256 /* Would overrun if increment makes (put==get). */ 257 if (put_next == k->k_rbget) { 258 k->k_intr_flags |= INTR_RX_OVERRUN; 259 } else { 260 /* OK, really increment. */ 261 put = put_next; 262 } 263 264 /* Done reading. */ 265 k->k_rbput = put; 266 267 /* Ask for softint() call. */ 268 cs->cs_softreq = 1; 269 } 270 271 272 static void 273 kbd_zs_txint(struct zs_chanstate *cs) 274 { 275 struct kbd_sun_softc *k; 276 277 k = cs->cs_private; 278 zs_write_csr(cs, ZSWR0_RESET_TXINT); 279 k->k_intr_flags |= INTR_TX_EMPTY; 280 /* Ask for softint() call. */ 281 cs->cs_softreq = 1; 282 } 283 284 285 static void 286 kbd_zs_stint(struct zs_chanstate *cs, int force) 287 { 288 struct kbd_sun_softc *k; 289 uint8_t rr0; 290 291 k = cs->cs_private; 292 293 rr0 = zs_read_csr(cs); 294 zs_write_csr(cs, ZSWR0_RESET_STATUS); 295 296 #if 0 297 if (rr0 & ZSRR0_BREAK) { 298 /* Keyboard unplugged? */ 299 zs_abort(cs); 300 return; 301 } 302 #endif 303 304 /* 305 * We have to accumulate status line changes here. 306 * Otherwise, if we get multiple status interrupts 307 * before the softint runs, we could fail to notice 308 * some status line changes in the softint routine. 309 * Fix from Bill Studenmund, October 1996. 310 */ 311 cs->cs_rr0_delta |= (cs->cs_rr0 ^ rr0); 312 cs->cs_rr0 = rr0; 313 k->k_intr_flags |= INTR_ST_CHECK; 314 315 /* Ask for softint() call. */ 316 cs->cs_softreq = 1; 317 } 318 319 /* 320 * Get input from the receive ring and pass it on. 321 * Note: this is called at splsoftclock() 322 */ 323 static void 324 kbd_zs_softint(struct zs_chanstate *cs) 325 { 326 struct kbd_sun_softc *k; 327 int get, c, s; 328 int intr_flags; 329 uint16_t ring_data; 330 331 k = cs->cs_private; 332 333 /* Atomically get and clear flags. */ 334 s = splzs(); 335 intr_flags = k->k_intr_flags; 336 k->k_intr_flags = 0; 337 338 /* Now lower to spltty for the rest. */ 339 (void)spltty(); 340 341 /* 342 * Copy data from the receive ring to the event layer. 343 */ 344 get = k->k_rbget; 345 while (get != k->k_rbput) { 346 ring_data = k->k_rbuf[get]; 347 get = (get + 1) & KBD_RX_RING_MASK; 348 349 /* low byte of ring_data is rr1 */ 350 c = (ring_data >> 8) & 0xff; 351 352 if (ring_data & ZSRR1_DO) 353 intr_flags |= INTR_RX_OVERRUN; 354 if (ring_data & (ZSRR1_FE | ZSRR1_PE)) { 355 /* 356 * After garbage, flush pending input, and 357 * send a reset to resync key translation. 358 */ 359 log(LOG_ERR, "%s: input error (0x%x)\n", 360 device_xname(k->k_kbd.k_dev), ring_data); 361 get = k->k_rbput; /* flush */ 362 goto send_reset; 363 } 364 365 /* Pass this up to the "middle" layer. */ 366 kbd_sun_input(k, c); 367 } 368 if (intr_flags & INTR_RX_OVERRUN) { 369 log(LOG_ERR, "%s: input overrun\n", 370 device_xname(k->k_kbd.k_dev)); 371 send_reset: 372 /* Send a reset to resync translation. */ 373 kbd_sun_output(k, KBD_CMD_RESET); 374 kbd_sun_start_tx(k); 375 } 376 k->k_rbget = get; 377 378 if (intr_flags & INTR_TX_EMPTY) { 379 /* 380 * Transmit done. Try to send more, or 381 * clear busy and wakeup drain waiters. 382 */ 383 k->k_txflags &= ~K_TXBUSY; 384 kbd_sun_start_tx(k); 385 } 386 387 if (intr_flags & INTR_ST_CHECK) { 388 /* 389 * Status line change. (Not expected.) 390 */ 391 log(LOG_ERR, "%s: status interrupt?\n", 392 device_xname(k->k_kbd.k_dev)); 393 cs->cs_rr0_delta = 0; 394 } 395 396 splx(s); 397 } 398
Indexes created Sat Sep 20 22:09:52 GMT 2025