hw/escc.c

   1 /*
   2  * QEMU ESCC (Z8030/Z8530/Z85C30/SCC/ESCC) serial port emulation
   3  *
   4  * Copyright (c) 2003-2005 Fabrice Bellard
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24 #include "hw.h"
  25 #include "escc.h"
  26 #include "qemu-char.h"
  27 #include "console.h"
  28
  29 /* debug serial */
  30 //#define DEBUG_SERIAL
  31
  32 /* debug keyboard */
  33 //#define DEBUG_KBD
  34
  35 /* debug mouse */
  36 //#define DEBUG_MOUSE
  37
  38 /*
  39  * On Sparc32 this is the serial port, mouse and keyboard part of chip STP2001
  40  * (Slave I/O), also produced as NCR89C105. See
  41  * http://www.ibiblio.org/pub/historic-linux/early-ports/Sparc/NCR/NCR89C105.txt
  42  *
  43  * The serial ports implement full AMD AM8530 or Zilog Z8530 chips,
  44  * mouse and keyboard ports don't implement all functions and they are
  45  * only asynchronous. There is no DMA.
  46  *
  47  * Z85C30 is also used on PowerMacs. There are some small differences
  48  * between Sparc version (sunzilog) and PowerMac (pmac):
  49  *  Offset between control and data registers
  50  *  There is some kind of lockup bug, but we can ignore it
  51  *  CTS is inverted
  52  *  DMA on pmac using DBDMA chip
  53  *  pmac can do IRDA and faster rates, sunzilog can only do 38400
  54  *  pmac baud rate generator clock is 3.6864 MHz, sunzilog 4.9152 MHz
  55  */
  56
  57 /*
  58  * Modifications:
  59  *  2006-Aug-10  Igor Kovalenko :   Renamed KBDQueue to SERIOQueue, implemented
  60  *                                  serial mouse queue.
  61  *                                  Implemented serial mouse protocol.
  62  */
  63
  64 #ifdef DEBUG_SERIAL
  65 #define SER_DPRINTF(fmt, args...) \
  66 do { printf("SER: " fmt , ##args); } while (0)
  67 #else
  68 #define SER_DPRINTF(fmt, args...)
  69 #endif
  70 #ifdef DEBUG_KBD
  71 #define KBD_DPRINTF(fmt, args...) \
  72 do { printf("KBD: " fmt , ##args); } while (0)
  73 #else
  74 #define KBD_DPRINTF(fmt, args...)
  75 #endif
  76 #ifdef DEBUG_MOUSE
  77 #define MS_DPRINTF(fmt, args...) \
  78 do { printf("MSC: " fmt , ##args); } while (0)
  79 #else
  80 #define MS_DPRINTF(fmt, args...)
  81 #endif
  82
  83 typedef enum {
  84     chn_a, chn_b,
  85 } chn_id_t;
  86
  87 #define CHN_C(s) ((s)->chn == chn_b? 'b' : 'a')
  88
  89 typedef enum {
  90     ser, kbd, mouse,
  91 } chn_type_t;
  92
  93 #define SERIO_QUEUE_SIZE 256
  94
  95 typedef struct {
  96     uint8_t data[SERIO_QUEUE_SIZE];
  97     int rptr, wptr, count;
  98 } SERIOQueue;
  99
 100 #define SERIAL_REGS 16
 101 typedef struct ChannelState {
 102     qemu_irq irq;
 103     uint32_t reg;
 104     uint32_t rxint, txint, rxint_under_svc, txint_under_svc;
 105     chn_id_t chn; // this channel, A (base+4) or B (base+0)
 106     chn_type_t type;
 107     struct ChannelState *otherchn;
 108     uint8_t rx, tx, wregs[SERIAL_REGS], rregs[SERIAL_REGS];
 109     SERIOQueue queue;
 110     CharDriverState *chr;
 111     int e0_mode, led_mode, caps_lock_mode, num_lock_mode;
 112     int disabled;
 113     int clock;
 114 } ChannelState;
 115
 116 struct SerialState {
 117     struct ChannelState chn[2];
 118     int it_shift;
 119 };
 120
 121 #define SERIAL_CTRL 0
 122 #define SERIAL_DATA 1
 123
 124 #define W_CMD     0
 125 #define CMD_PTR_MASK   0x07
 126 #define CMD_CMD_MASK   0x38
 127 #define CMD_HI         0x08
 128 #define CMD_CLR_TXINT  0x28
 129 #define CMD_CLR_IUS    0x38
 130 #define W_INTR    1
 131 #define INTR_INTALL    0x01
 132 #define INTR_TXINT     0x02
 133 #define INTR_RXMODEMSK 0x18
 134 #define INTR_RXINT1ST  0x08
 135 #define INTR_RXINTALL  0x10
 136 #define W_IVEC    2
 137 #define W_RXCTRL  3
 138 #define RXCTRL_RXEN    0x01
 139 #define W_TXCTRL1 4
 140 #define TXCTRL1_PAREN  0x01
 141 #define TXCTRL1_PAREV  0x02
 142 #define TXCTRL1_1STOP  0x04
 143 #define TXCTRL1_1HSTOP 0x08
 144 #define TXCTRL1_2STOP  0x0c
 145 #define TXCTRL1_STPMSK 0x0c
 146 #define TXCTRL1_CLK1X  0x00
 147 #define TXCTRL1_CLK16X 0x40
 148 #define TXCTRL1_CLK32X 0x80
 149 #define TXCTRL1_CLK64X 0xc0
 150 #define TXCTRL1_CLKMSK 0xc0
 151 #define W_TXCTRL2 5
 152 #define TXCTRL2_TXEN   0x08
 153 #define TXCTRL2_BITMSK 0x60
 154 #define TXCTRL2_5BITS  0x00
 155 #define TXCTRL2_7BITS  0x20
 156 #define TXCTRL2_6BITS  0x40
 157 #define TXCTRL2_8BITS  0x60
 158 #define W_SYNC1   6
 159 #define W_SYNC2   7
 160 #define W_TXBUF   8
 161 #define W_MINTR   9
 162 #define MINTR_STATUSHI 0x10
 163 #define MINTR_RST_MASK 0xc0
 164 #define MINTR_RST_B    0x40
 165 #define MINTR_RST_A    0x80
 166 #define MINTR_RST_ALL  0xc0
 167 #define W_MISC1  10
 168 #define W_CLOCK  11
 169 #define CLOCK_TRXC     0x08
 170 #define W_BRGLO  12
 171 #define W_BRGHI  13
 172 #define W_MISC2  14
 173 #define MISC2_PLLDIS   0x30
 174 #define W_EXTINT 15
 175 #define EXTINT_DCD     0x08
 176 #define EXTINT_SYNCINT 0x10
 177 #define EXTINT_CTSINT  0x20
 178 #define EXTINT_TXUNDRN 0x40
 179 #define EXTINT_BRKINT  0x80
 180
 181 #define R_STATUS  0
 182 #define STATUS_RXAV    0x01
 183 #define STATUS_ZERO    0x02
 184 #define STATUS_TXEMPTY 0x04
 185 #define STATUS_DCD     0x08
 186 #define STATUS_SYNC    0x10
 187 #define STATUS_CTS     0x20
 188 #define STATUS_TXUNDRN 0x40
 189 #define STATUS_BRK     0x80
 190 #define R_SPEC    1
 191 #define SPEC_ALLSENT   0x01
 192 #define SPEC_BITS8     0x06
 193 #define R_IVEC    2
 194 #define IVEC_TXINTB    0x00
 195 #define IVEC_LONOINT   0x06
 196 #define IVEC_LORXINTA  0x0c
 197 #define IVEC_LORXINTB  0x04
 198 #define IVEC_LOTXINTA  0x08
 199 #define IVEC_HINOINT   0x60
 200 #define IVEC_HIRXINTA  0x30
 201 #define IVEC_HIRXINTB  0x20
 202 #define IVEC_HITXINTA  0x10
 203 #define R_INTR    3
 204 #define INTR_EXTINTB   0x01
 205 #define INTR_TXINTB    0x02
 206 #define INTR_RXINTB    0x04
 207 #define INTR_EXTINTA   0x08
 208 #define INTR_TXINTA    0x10
 209 #define INTR_RXINTA    0x20
 210 #define R_IPEN    4
 211 #define R_TXCTRL1 5
 212 #define R_TXCTRL2 6
 213 #define R_BC      7
 214 #define R_RXBUF   8
 215 #define R_RXCTRL  9
 216 #define R_MISC   10
 217 #define R_MISC1  11
 218 #define R_BRGLO  12
 219 #define R_BRGHI  13
 220 #define R_MISC1I 14
 221 #define R_EXTINT 15
 222
 223 static void handle_kbd_command(ChannelState *s, int val);
 224 static int serial_can_receive(void *opaque);
 225 static void serial_receive_byte(ChannelState *s, int ch);
 226
 227 static void clear_queue(void *opaque)
 228 {
 229     ChannelState *s = opaque;
 230     SERIOQueue *q = &s->queue;
 231     q->rptr = q->wptr = q->count = 0;
 232 }
 233
 234 static void put_queue(void *opaque, int b)
 235 {
 236     ChannelState *s = opaque;
 237     SERIOQueue *q = &s->queue;
 238
 239     SER_DPRINTF("channel %c put: 0x%02x\n", CHN_C(s), b);
 240     if (q->count >= SERIO_QUEUE_SIZE)
 241         return;
 242     q->data[q->wptr] = b;
 243     if (++q->wptr == SERIO_QUEUE_SIZE)
 244         q->wptr = 0;
 245     q->count++;
 246     serial_receive_byte(s, 0);
 247 }
 248
 249 static uint32_t get_queue(void *opaque)
 250 {
 251     ChannelState *s = opaque;
 252     SERIOQueue *q = &s->queue;
 253     int val;
 254
 255     if (q->count == 0) {
 256         return 0;
 257     } else {
 258         val = q->data[q->rptr];
 259         if (++q->rptr == SERIO_QUEUE_SIZE)
 260             q->rptr = 0;
 261         q->count--;
 262     }
 263     SER_DPRINTF("channel %c get 0x%02x\n", CHN_C(s), val);
 264     if (q->count > 0)
 265         serial_receive_byte(s, 0);
 266     return val;
 267 }
 268
 269 static int escc_update_irq_chn(ChannelState *s)
 270 {
 271     if ((((s->wregs[W_INTR] & INTR_TXINT) && s->txint == 1) ||
 272          // tx ints enabled, pending
 273          ((((s->wregs[W_INTR] & INTR_RXMODEMSK) == INTR_RXINT1ST) ||
 274            ((s->wregs[W_INTR] & INTR_RXMODEMSK) == INTR_RXINTALL)) &&
 275           s->rxint == 1) || // rx ints enabled, pending
 276          ((s->wregs[W_EXTINT] & EXTINT_BRKINT) &&
 277           (s->rregs[R_STATUS] & STATUS_BRK)))) { // break int e&p
 278         return 1;
 279     }
 280     return 0;
 281 }
 282
 283 static void escc_update_irq(ChannelState *s)
 284 {
 285     int irq;
 286
 287     irq = escc_update_irq_chn(s);
 288     irq |= escc_update_irq_chn(s->otherchn);
 289
 290     SER_DPRINTF("IRQ = %d\n", irq);
 291     qemu_set_irq(s->irq, irq);
 292 }
 293
 294 static void escc_reset_chn(ChannelState *s)
 295 {
 296     int i;
 297
 298     s->reg = 0;
 299     for (i = 0; i < SERIAL_REGS; i++) {
 300         s->rregs[i] = 0;
 301         s->wregs[i] = 0;
 302     }
 303     s->wregs[W_TXCTRL1] = TXCTRL1_1STOP; // 1X divisor, 1 stop bit, no parity
 304     s->wregs[W_MINTR] = MINTR_RST_ALL;
 305     s->wregs[W_CLOCK] = CLOCK_TRXC; // Synch mode tx clock = TRxC
 306     s->wregs[W_MISC2] = MISC2_PLLDIS; // PLL disabled
 307     s->wregs[W_EXTINT] = EXTINT_DCD | EXTINT_SYNCINT | EXTINT_CTSINT |
 308         EXTINT_TXUNDRN | EXTINT_BRKINT; // Enable most interrupts
 309     if (s->disabled)
 310         s->rregs[R_STATUS] = STATUS_TXEMPTY | STATUS_DCD | STATUS_SYNC |
 311             STATUS_CTS | STATUS_TXUNDRN;
 312     else
 313         s->rregs[R_STATUS] = STATUS_TXEMPTY | STATUS_TXUNDRN;
 314     s->rregs[R_SPEC] = SPEC_BITS8 | SPEC_ALLSENT;
 315
 316     s->rx = s->tx = 0;
 317     s->rxint = s->txint = 0;
 318     s->rxint_under_svc = s->txint_under_svc = 0;
 319     s->e0_mode = s->led_mode = s->caps_lock_mode = s->num_lock_mode = 0;
 320     clear_queue(s);
 321 }
 322
 323 static void escc_reset(void *opaque)
 324 {
 325     SerialState *s = opaque;
 326     escc_reset_chn(&s->chn[0]);
 327     escc_reset_chn(&s->chn[1]);
 328 }
 329
 330 static inline void set_rxint(ChannelState *s)
 331 {
 332     s->rxint = 1;
 333     if (!s->txint_under_svc) {
 334         s->rxint_under_svc = 1;
 335         if (s->chn == chn_a) {
 336             if (s->wregs[W_MINTR] & MINTR_STATUSHI)
 337                 s->otherchn->rregs[R_IVEC] = IVEC_HIRXINTA;
 338             else
 339                 s->otherchn->rregs[R_IVEC] = IVEC_LORXINTA;
 340         } else {
 341             if (s->wregs[W_MINTR] & MINTR_STATUSHI)
 342                 s->rregs[R_IVEC] = IVEC_HIRXINTB;
 343             else
 344                 s->rregs[R_IVEC] = IVEC_LORXINTB;
 345         }
 346     }
 347     if (s->chn == chn_a)
 348         s->rregs[R_INTR] |= INTR_RXINTA;
 349     else
 350         s->otherchn->rregs[R_INTR] |= INTR_RXINTB;
 351     escc_update_irq(s);
 352 }
 353
 354 static inline void set_txint(ChannelState *s)
 355 {
 356     s->txint = 1;
 357     if (!s->rxint_under_svc) {
 358         s->txint_under_svc = 1;
 359         if (s->chn == chn_a) {
 360             if (s->wregs[W_MINTR] & MINTR_STATUSHI)
 361                 s->otherchn->rregs[R_IVEC] = IVEC_HITXINTA;
 362             else
 363                 s->otherchn->rregs[R_IVEC] = IVEC_LOTXINTA;
 364         } else {
 365             s->rregs[R_IVEC] = IVEC_TXINTB;
 366         }
 367     }
 368     if (s->chn == chn_a)
 369         s->rregs[R_INTR] |= INTR_TXINTA;
 370     else
 371         s->otherchn->rregs[R_INTR] |= INTR_TXINTB;
 372     escc_update_irq(s);
 373 }
 374
 375 static inline void clr_rxint(ChannelState *s)
 376 {
 377     s->rxint = 0;
 378     s->rxint_under_svc = 0;
 379     if (s->chn == chn_a) {
 380         if (s->wregs[W_MINTR] & MINTR_STATUSHI)
 381             s->otherchn->rregs[R_IVEC] = IVEC_HINOINT;
 382         else
 383             s->otherchn->rregs[R_IVEC] = IVEC_LONOINT;
 384         s->rregs[R_INTR] &= ~INTR_RXINTA;
 385     } else {
 386         if (s->wregs[W_MINTR] & MINTR_STATUSHI)
 387             s->rregs[R_IVEC] = IVEC_HINOINT;
 388         else
 389             s->rregs[R_IVEC] = IVEC_LONOINT;
 390         s->otherchn->rregs[R_INTR] &= ~INTR_RXINTB;
 391     }
 392     if (s->txint)
 393         set_txint(s);
 394     escc_update_irq(s);
 395 }
 396
 397 static inline void clr_txint(ChannelState *s)
 398 {
 399     s->txint = 0;
 400     s->txint_under_svc = 0;
 401     if (s->chn == chn_a) {
 402         if (s->wregs[W_MINTR] & MINTR_STATUSHI)
 403             s->otherchn->rregs[R_IVEC] = IVEC_HINOINT;
 404         else
 405             s->otherchn->rregs[R_IVEC] = IVEC_LONOINT;
 406         s->rregs[R_INTR] &= ~INTR_TXINTA;
 407     } else {
 408         if (s->wregs[W_MINTR] & MINTR_STATUSHI)
 409             s->rregs[R_IVEC] = IVEC_HINOINT;
 410         else
 411             s->rregs[R_IVEC] = IVEC_LONOINT;
 412         s->otherchn->rregs[R_INTR] &= ~INTR_TXINTB;
 413     }
 414     if (s->rxint)
 415         set_rxint(s);
 416     escc_update_irq(s);
 417 }
 418
 419 static void escc_update_parameters(ChannelState *s)
 420 {
 421     int speed, parity, data_bits, stop_bits;
 422     QEMUSerialSetParams ssp;
 423
 424     if (!s->chr || s->type != ser)
 425         return;
 426
 427     if (s->wregs[W_TXCTRL1] & TXCTRL1_PAREN) {
 428         if (s->wregs[W_TXCTRL1] & TXCTRL1_PAREV)
 429             parity = 'E';
 430         else
 431             parity = 'O';
 432     } else {
 433         parity = 'N';
 434     }
 435     if ((s->wregs[W_TXCTRL1] & TXCTRL1_STPMSK) == TXCTRL1_2STOP)
 436         stop_bits = 2;
 437     else
 438         stop_bits = 1;
 439     switch (s->wregs[W_TXCTRL2] & TXCTRL2_BITMSK) {
 440     case TXCTRL2_5BITS:
 441         data_bits = 5;
 442         break;
 443     case TXCTRL2_7BITS:
 444         data_bits = 7;
 445         break;
 446     case TXCTRL2_6BITS:
 447         data_bits = 6;
 448         break;
 449     default:
 450     case TXCTRL2_8BITS:
 451         data_bits = 8;
 452         break;
 453     }
 454     speed = s->clock / ((s->wregs[W_BRGLO] | (s->wregs[W_BRGHI] << 8)) + 2);
 455     switch (s->wregs[W_TXCTRL1] & TXCTRL1_CLKMSK) {
 456     case TXCTRL1_CLK1X:
 457         break;
 458     case TXCTRL1_CLK16X:
 459         speed /= 16;
 460         break;
 461     case TXCTRL1_CLK32X:
 462         speed /= 32;
 463         break;
 464     default:
 465     case TXCTRL1_CLK64X:
 466         speed /= 64;
 467         break;
 468     }
 469     ssp.speed = speed;
 470     ssp.parity = parity;
 471     ssp.data_bits = data_bits;
 472     ssp.stop_bits = stop_bits;
 473     SER_DPRINTF("channel %c: speed=%d parity=%c data=%d stop=%d\n", CHN_C(s),
 474                 speed, parity, data_bits, stop_bits);
 475     qemu_chr_ioctl(s->chr, CHR_IOCTL_SERIAL_SET_PARAMS, &ssp);
 476 }
 477
 478 static void escc_mem_writeb(void *opaque, target_phys_addr_t addr, uint32_t val)
 479 {
 480     SerialState *serial = opaque;
 481     ChannelState *s;
 482     uint32_t saddr;
 483     int newreg, channel;
 484
 485     val &= 0xff;
 486     saddr = (addr >> serial->it_shift) & 1;
 487     channel = (addr >> (serial->it_shift + 1)) & 1;
 488     s = &serial->chn[channel];
 489     switch (saddr) {
 490     case SERIAL_CTRL:
 491         SER_DPRINTF("Write channel %c, reg[%d] = %2.2x\n", CHN_C(s), s->reg,
 492                     val & 0xff);
 493         newreg = 0;
 494         switch (s->reg) {
 495         case W_CMD:
 496             newreg = val & CMD_PTR_MASK;
 497             val &= CMD_CMD_MASK;
 498             switch (val) {
 499             case CMD_HI:
 500                 newreg |= CMD_HI;
 501                 break;
 502             case CMD_CLR_TXINT:
 503                 clr_txint(s);
 504                 break;
 505             case CMD_CLR_IUS:
 506                 if (s->rxint_under_svc)
 507                     clr_rxint(s);
 508                 else if (s->txint_under_svc)
 509                     clr_txint(s);
 510                 break;
 511             default:
 512                 break;
 513             }
 514             break;
 515         case W_INTR ... W_RXCTRL:
 516         case W_SYNC1 ... W_TXBUF:
 517         case W_MISC1 ... W_CLOCK:
 518         case W_MISC2 ... W_EXTINT:
 519             s->wregs[s->reg] = val;
 520             break;
 521         case W_TXCTRL1:
 522         case W_TXCTRL2:
 523             s->wregs[s->reg] = val;
 524             escc_update_parameters(s);
 525             break;
 526         case W_BRGLO:
 527         case W_BRGHI:
 528             s->wregs[s->reg] = val;
 529             s->rregs[s->reg] = val;
 530             escc_update_parameters(s);
 531             break;
 532         case W_MINTR:
 533             switch (val & MINTR_RST_MASK) {
 534             case 0:
 535             default:
 536                 break;
 537             case MINTR_RST_B:
 538                 escc_reset_chn(&serial->chn[0]);
 539                 return;
 540             case MINTR_RST_A:
 541                 escc_reset_chn(&serial->chn[1]);
 542                 return;
 543             case MINTR_RST_ALL:
 544                 escc_reset(serial);
 545                 return;
 546             }
 547             break;
 548         default:
 549             break;
 550         }
 551         if (s->reg == 0)
 552             s->reg = newreg;
 553         else
 554             s->reg = 0;
 555         break;
 556     case SERIAL_DATA:
 557         SER_DPRINTF("Write channel %c, ch %d\n", CHN_C(s), val);
 558         s->tx = val;
 559         if (s->wregs[W_TXCTRL2] & TXCTRL2_TXEN) { // tx enabled
 560             if (s->chr)
 561                 qemu_chr_write(s->chr, &s->tx, 1);
 562             else if (s->type == kbd && !s->disabled) {
 563                 handle_kbd_command(s, val);
 564             }
 565         }
 566         s->rregs[R_STATUS] |= STATUS_TXEMPTY; // Tx buffer empty
 567         s->rregs[R_SPEC] |= SPEC_ALLSENT; // All sent
 568         set_txint(s);
 569         break;
 570     default:
 571         break;
 572     }
 573 }
 574
 575 static uint32_t escc_mem_readb(void *opaque, target_phys_addr_t addr)
 576 {
 577     SerialState *serial = opaque;
 578     ChannelState *s;
 579     uint32_t saddr;
 580     uint32_t ret;
 581     int channel;
 582
 583     saddr = (addr >> serial->it_shift) & 1;
 584     channel = (addr >> (serial->it_shift + 1)) & 1;
 585     s = &serial->chn[channel];
 586     switch (saddr) {
 587     case SERIAL_CTRL:
 588         SER_DPRINTF("Read channel %c, reg[%d] = %2.2x\n", CHN_C(s), s->reg,
 589                     s->rregs[s->reg]);
 590         ret = s->rregs[s->reg];
 591         s->reg = 0;
 592         return ret;
 593     case SERIAL_DATA:
 594         s->rregs[R_STATUS] &= ~STATUS_RXAV;
 595         clr_rxint(s);
 596         if (s->type == kbd || s->type == mouse)
 597             ret = get_queue(s);
 598         else
 599             ret = s->rx;
 600         SER_DPRINTF("Read channel %c, ch %d\n", CHN_C(s), ret);
 601         if (s->chr)
 602             qemu_chr_accept_input(s->chr);
 603         return ret;
 604     default:
 605         break;
 606     }
 607     return 0;
 608 }
 609
 610 static int serial_can_receive(void *opaque)
 611 {
 612     ChannelState *s = opaque;
 613     int ret;
 614
 615     if (((s->wregs[W_RXCTRL] & RXCTRL_RXEN) == 0) // Rx not enabled
 616         || ((s->rregs[R_STATUS] & STATUS_RXAV) == STATUS_RXAV))
 617         // char already available
 618         ret = 0;
 619     else
 620         ret = 1;
 621     return ret;
 622 }
 623
 624 static void serial_receive_byte(ChannelState *s, int ch)
 625 {
 626     SER_DPRINTF("channel %c put ch %d\n", CHN_C(s), ch);
 627     s->rregs[R_STATUS] |= STATUS_RXAV;
 628     s->rx = ch;
 629     set_rxint(s);
 630 }
 631
 632 static void serial_receive_break(ChannelState *s)
 633 {
 634     s->rregs[R_STATUS] |= STATUS_BRK;
 635     escc_update_irq(s);
 636 }
 637
 638 static void serial_receive1(void *opaque, const uint8_t *buf, int size)
 639 {
 640     ChannelState *s = opaque;
 641     serial_receive_byte(s, buf[0]);
 642 }
 643
 644 static void serial_event(void *opaque, int event)
 645 {
 646     ChannelState *s = opaque;
 647     if (event == CHR_EVENT_BREAK)
 648         serial_receive_break(s);
 649 }
 650
 651 static CPUReadMemoryFunc *escc_mem_read[3] = {
 652     escc_mem_readb,
 653     NULL,
 654     NULL,
 655 };
 656
 657 static CPUWriteMemoryFunc *escc_mem_write[3] = {
 658     escc_mem_writeb,
 659     NULL,
 660     NULL,
 661 };
 662
 663 static void escc_save_chn(QEMUFile *f, ChannelState *s)
 664 {
 665     uint32_t tmp = 0;
 666
 667     qemu_put_be32s(f, &tmp); /* unused, was IRQ.  */
 668     qemu_put_be32s(f, &s->reg);
 669     qemu_put_be32s(f, &s->rxint);
 670     qemu_put_be32s(f, &s->txint);
 671     qemu_put_be32s(f, &s->rxint_under_svc);
 672     qemu_put_be32s(f, &s->txint_under_svc);
 673     qemu_put_8s(f, &s->rx);
 674     qemu_put_8s(f, &s->tx);
 675     qemu_put_buffer(f, s->wregs, SERIAL_REGS);
 676     qemu_put_buffer(f, s->rregs, SERIAL_REGS);
 677 }
 678
 679 static void escc_save(QEMUFile *f, void *opaque)
 680 {
 681     SerialState *s = opaque;
 682
 683     escc_save_chn(f, &s->chn[0]);
 684     escc_save_chn(f, &s->chn[1]);
 685 }
 686
 687 static int escc_load_chn(QEMUFile *f, ChannelState *s, int version_id)
 688 {
 689     uint32_t tmp;
 690
 691     if (version_id > 2)
 692         return -EINVAL;
 693
 694     qemu_get_be32s(f, &tmp); /* unused */
 695     qemu_get_be32s(f, &s->reg);
 696     qemu_get_be32s(f, &s->rxint);
 697     qemu_get_be32s(f, &s->txint);
 698     if (version_id >= 2) {
 699         qemu_get_be32s(f, &s->rxint_under_svc);
 700         qemu_get_be32s(f, &s->txint_under_svc);
 701     }
 702     qemu_get_8s(f, &s->rx);
 703     qemu_get_8s(f, &s->tx);
 704     qemu_get_buffer(f, s->wregs, SERIAL_REGS);
 705     qemu_get_buffer(f, s->rregs, SERIAL_REGS);
 706     return 0;
 707 }
 708
 709 static int escc_load(QEMUFile *f, void *opaque, int version_id)
 710 {
 711     SerialState *s = opaque;
 712     int ret;
 713
 714     ret = escc_load_chn(f, &s->chn[0], version_id);
 715     if (ret != 0)
 716         return ret;
 717     ret = escc_load_chn(f, &s->chn[1], version_id);
 718     return ret;
 719
 720 }
 721
 722 int escc_init(target_phys_addr_t base, qemu_irq irqA, qemu_irq irqB,
 723               CharDriverState *chrA, CharDriverState *chrB,
 724               int clock, int it_shift)
 725 {
 726     int escc_io_memory, i;
 727     SerialState *s;
 728
 729     s = qemu_mallocz(sizeof(SerialState));
 730
 731     escc_io_memory = cpu_register_io_memory(0, escc_mem_read,
 732                                             escc_mem_write,
 733                                             s);
 734     if (base)
 735         cpu_register_physical_memory(base, ESCC_SIZE << it_shift,
 736                                      escc_io_memory);
 737
 738     s->it_shift = it_shift;
 739     s->chn[0].chr = chrB;
 740     s->chn[1].chr = chrA;
 741     s->chn[0].disabled = 0;
 742     s->chn[1].disabled = 0;
 743     s->chn[0].irq = irqB;
 744     s->chn[1].irq = irqA;
 745
 746     for (i = 0; i < 2; i++) {
 747         s->chn[i].chn = 1 - i;
 748         s->chn[i].type = ser;
 749         s->chn[i].clock = clock / 2;
 750         if (s->chn[i].chr) {
 751             qemu_chr_add_handlers(s->chn[i].chr, serial_can_receive,
 752                                   serial_receive1, serial_event, &s->chn[i]);
 753         }
 754     }
 755     s->chn[0].otherchn = &s->chn[1];
 756     s->chn[1].otherchn = &s->chn[0];
 757     if (base)
 758         register_savevm("escc", base, 2, escc_save, escc_load, s);
 759     else
 760         register_savevm("escc", -1, 2, escc_save, escc_load, s);
 761     qemu_register_reset(escc_reset, s);
 762     escc_reset(s);
 763     return escc_io_memory;
 764 }
 765
 766 static const uint8_t keycodes[128] = {
 767     127, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 43, 53,
 768     54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 89, 76, 77, 78,
 769     79, 80, 81, 82, 83, 84, 85, 86, 87, 42, 99, 88, 100, 101, 102, 103,
 770     104, 105, 106, 107, 108, 109, 110, 47, 19, 121, 119, 5, 6, 8, 10, 12,
 771     14, 16, 17, 18, 7, 98, 23, 68, 69, 70, 71, 91, 92, 93, 125, 112,
 772     113, 114, 94, 50, 0, 0, 124, 9, 11, 0, 0, 0, 0, 0, 0, 0,
 773     90, 0, 46, 22, 13, 111, 52, 20, 96, 24, 28, 74, 27, 123, 44, 66,
 774     0, 45, 2, 4, 48, 0, 0, 21, 0, 0, 0, 0, 0, 120, 122, 67,
 775 };
 776
 777 static const uint8_t e0_keycodes[128] = {
 778     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 779     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 90, 76, 0, 0,
 780     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 781     0, 0, 0, 0, 0, 109, 0, 0, 13, 0, 0, 0, 0, 0, 0, 0,
 782     0, 0, 0, 0, 0, 0, 0, 68, 69, 70, 0, 91, 0, 93, 0, 112,
 783     113, 114, 94, 50, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 784     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 785     1, 3, 25, 26, 49, 52, 72, 73, 97, 99, 111, 118, 120, 122, 67, 0,
 786 };
 787
 788 static void sunkbd_event(void *opaque, int ch)
 789 {
 790     ChannelState *s = opaque;
 791     int release = ch & 0x80;
 792
 793     KBD_DPRINTF("Untranslated keycode %2.2x (%s)\n", ch, release? "release" :
 794                 "press");
 795     switch (ch) {
 796     case 58: // Caps lock press
 797         s->caps_lock_mode ^= 1;
 798         if (s->caps_lock_mode == 2)
 799             return; // Drop second press
 800         break;
 801     case 69: // Num lock press
 802         s->num_lock_mode ^= 1;
 803         if (s->num_lock_mode == 2)
 804             return; // Drop second press
 805         break;
 806     case 186: // Caps lock release
 807         s->caps_lock_mode ^= 2;
 808         if (s->caps_lock_mode == 3)
 809             return; // Drop first release
 810         break;
 811     case 197: // Num lock release
 812         s->num_lock_mode ^= 2;
 813         if (s->num_lock_mode == 3)
 814             return; // Drop first release
 815         break;
 816     case 0xe0:
 817         s->e0_mode = 1;
 818         return;
 819     default:
 820         break;
 821     }
 822     if (s->e0_mode) {
 823         s->e0_mode = 0;
 824         ch = e0_keycodes[ch & 0x7f];
 825     } else {
 826         ch = keycodes[ch & 0x7f];
 827     }
 828     KBD_DPRINTF("Translated keycode %2.2x\n", ch);
 829     put_queue(s, ch | release);
 830 }
 831
 832 static void handle_kbd_command(ChannelState *s, int val)
 833 {
 834     KBD_DPRINTF("Command %d\n", val);
 835     if (s->led_mode) { // Ignore led byte
 836         s->led_mode = 0;
 837         return;
 838     }
 839     switch (val) {
 840     case 1: // Reset, return type code
 841         clear_queue(s);
 842         put_queue(s, 0xff);
 843         put_queue(s, 4); // Type 4
 844         put_queue(s, 0x7f);
 845         break;
 846     case 0xe: // Set leds
 847         s->led_mode = 1;
 848         break;
 849     case 7: // Query layout
 850     case 0xf:
 851         clear_queue(s);
 852         put_queue(s, 0xfe);
 853         put_queue(s, 0); // XXX, layout?
 854         break;
 855     default:
 856         break;
 857     }
 858 }
 859
 860 static void sunmouse_event(void *opaque,
 861                                int dx, int dy, int dz, int buttons_state)
 862 {
 863     ChannelState *s = opaque;
 864     int ch;
 865
 866     MS_DPRINTF("dx=%d dy=%d buttons=%01x\n", dx, dy, buttons_state);
 867
 868     ch = 0x80 | 0x7; /* protocol start byte, no buttons pressed */
 869
 870     if (buttons_state & MOUSE_EVENT_LBUTTON)
 871         ch ^= 0x4;
 872     if (buttons_state & MOUSE_EVENT_MBUTTON)
 873         ch ^= 0x2;
 874     if (buttons_state & MOUSE_EVENT_RBUTTON)
 875         ch ^= 0x1;
 876
 877     put_queue(s, ch);
 878
 879     ch = dx;
 880
 881     if (ch > 127)
 882         ch=127;
 883     else if (ch < -127)
 884         ch=-127;
 885
 886     put_queue(s, ch & 0xff);
 887
 888     ch = -dy;
 889
 890     if (ch > 127)
 891         ch=127;
 892     else if (ch < -127)
 893         ch=-127;
 894
 895     put_queue(s, ch & 0xff);
 896
 897     // MSC protocol specify two extra motion bytes
 898
 899     put_queue(s, 0);
 900     put_queue(s, 0);
 901 }
 902
 903 void slavio_serial_ms_kbd_init(target_phys_addr_t base, qemu_irq irq,
 904                                int disabled, int clock, int it_shift)
 905 {
 906     int slavio_serial_io_memory, i;
 907     SerialState *s;
 908
 909     s = qemu_mallocz(sizeof(SerialState));
 910
 911     s->it_shift = it_shift;
 912     for (i = 0; i < 2; i++) {
 913         s->chn[i].irq = irq;
 914         s->chn[i].chn = 1 - i;
 915         s->chn[i].chr = NULL;
 916         s->chn[i].clock = clock / 2;
 917     }
 918     s->chn[0].otherchn = &s->chn[1];
 919     s->chn[1].otherchn = &s->chn[0];
 920     s->chn[0].type = mouse;
 921     s->chn[1].type = kbd;
 922     s->chn[0].disabled = disabled;
 923     s->chn[1].disabled = disabled;
 924
 925     slavio_serial_io_memory = cpu_register_io_memory(0, escc_mem_read,
 926                                                      escc_mem_write,
 927                                                      s);
 928     cpu_register_physical_memory(base, ESCC_SIZE << it_shift,
 929                                  slavio_serial_io_memory);
 930
 931     qemu_add_mouse_event_handler(sunmouse_event, &s->chn[0], 0,
 932                                  "QEMU Sun Mouse");
 933     qemu_add_kbd_event_handler(sunkbd_event, &s->chn[1]);
 934     register_savevm("slavio_serial_mouse", base, 2, escc_save, escc_load, s);
 935     qemu_register_reset(escc_reset, s);
 936     escc_reset(s);
 937 }