drivers/tty/serial/sunzilog.c

   1 /* sunzilog.c: Zilog serial driver for Sparc systems.
   2  *
   3  * Driver for Zilog serial chips found on Sun workstations and
   4  * servers.  This driver could actually be made more generic.
   5  *
   6  * This is based on the old drivers/sbus/char/zs.c code.  A lot
   7  * of code has been simply moved over directly from there but
   8  * much has been rewritten.  Credits therefore go out to Eddie
   9  * C. Dost, Pete Zaitcev, Ted Ts'o and Alex Buell for their
  10  * work there.
  11  *
  12  * Copyright (C) 2002, 2006, 2007 David S. Miller (davem@davemloft.net)
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/kernel.h>
  17 #include <linux/errno.h>
  18 #include <linux/delay.h>
  19 #include <linux/tty.h>
  20 #include <linux/tty_flip.h>
  21 #include <linux/major.h>
  22 #include <linux/string.h>
  23 #include <linux/ptrace.h>
  24 #include <linux/ioport.h>
  25 #include <linux/slab.h>
  26 #include <linux/circ_buf.h>
  27 #include <linux/serial.h>
  28 #include <linux/sysrq.h>
  29 #include <linux/console.h>
  30 #include <linux/spinlock.h>
  31 #ifdef CONFIG_SERIO
  32 #include <linux/serio.h>
  33 #endif
  34 #include <linux/init.h>
  35 #include <linux/of_device.h>
  36
  37 #include <asm/io.h>
  38 #include <asm/irq.h>
  39 #include <asm/prom.h>
  40 #include <asm/setup.h>
  41
  42 #if defined(CONFIG_SERIAL_SUNZILOG_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
  43 #define SUPPORT_SYSRQ
  44 #endif
  45
  46 #include <linux/serial_core.h>
  47 #include <linux/sunserialcore.h>
  48
  49 #include "sunzilog.h"
  50
  51 /* On 32-bit sparcs we need to delay after register accesses
  52  * to accommodate sun4 systems, but we do not need to flush writes.
  53  * On 64-bit sparc we only need to flush single writes to ensure
  54  * completion.
  55  */
  56 #ifndef CONFIG_SPARC64
  57 #define ZSDELAY()               udelay(5)
  58 #define ZSDELAY_LONG()          udelay(20)
  59 #define ZS_WSYNC(channel)       do { } while (0)
  60 #else
  61 #define ZSDELAY()
  62 #define ZSDELAY_LONG()
  63 #define ZS_WSYNC(__channel) \
  64         readb(&((__channel)->control))
  65 #endif
  66
  67 #define ZS_CLOCK                4915200 /* Zilog input clock rate. */
  68 #define ZS_CLOCK_DIVISOR        16      /* Divisor this driver uses. */
  69
  70 /*
  71  * We wrap our port structure around the generic uart_port.
  72  */
  73 struct uart_sunzilog_port {
  74         struct uart_port                port;
  75
  76         /* IRQ servicing chain.  */
  77         struct uart_sunzilog_port       *next;
  78
  79         /* Current values of Zilog write registers.  */
  80         unsigned char                   curregs[NUM_ZSREGS];
  81
  82         unsigned int                    flags;
  83 #define SUNZILOG_FLAG_CONS_KEYB         0x00000001
  84 #define SUNZILOG_FLAG_CONS_MOUSE        0x00000002
  85 #define SUNZILOG_FLAG_IS_CONS           0x00000004
  86 #define SUNZILOG_FLAG_IS_KGDB           0x00000008
  87 #define SUNZILOG_FLAG_MODEM_STATUS      0x00000010
  88 #define SUNZILOG_FLAG_IS_CHANNEL_A      0x00000020
  89 #define SUNZILOG_FLAG_REGS_HELD         0x00000040
  90 #define SUNZILOG_FLAG_TX_STOPPED        0x00000080
  91 #define SUNZILOG_FLAG_TX_ACTIVE         0x00000100
  92 #define SUNZILOG_FLAG_ESCC              0x00000200
  93 #define SUNZILOG_FLAG_ISR_HANDLER       0x00000400
  94
  95         unsigned int cflag;
  96
  97         unsigned char                   parity_mask;
  98         unsigned char                   prev_status;
  99
 100 #ifdef CONFIG_SERIO
 101         struct serio                    serio;
 102         int                             serio_open;
 103 #endif
 104 };
 105
 106 static void sunzilog_putchar(struct uart_port *port, int ch);
 107
 108 #define ZILOG_CHANNEL_FROM_PORT(PORT)   ((struct zilog_channel __iomem *)((PORT)->membase))
 109 #define UART_ZILOG(PORT)                ((struct uart_sunzilog_port *)(PORT))
 110
 111 #define ZS_IS_KEYB(UP)  ((UP)->flags & SUNZILOG_FLAG_CONS_KEYB)
 112 #define ZS_IS_MOUSE(UP) ((UP)->flags & SUNZILOG_FLAG_CONS_MOUSE)
 113 #define ZS_IS_CONS(UP)  ((UP)->flags & SUNZILOG_FLAG_IS_CONS)
 114 #define ZS_IS_KGDB(UP)  ((UP)->flags & SUNZILOG_FLAG_IS_KGDB)
 115 #define ZS_WANTS_MODEM_STATUS(UP)       ((UP)->flags & SUNZILOG_FLAG_MODEM_STATUS)
 116 #define ZS_IS_CHANNEL_A(UP)     ((UP)->flags & SUNZILOG_FLAG_IS_CHANNEL_A)
 117 #define ZS_REGS_HELD(UP)        ((UP)->flags & SUNZILOG_FLAG_REGS_HELD)
 118 #define ZS_TX_STOPPED(UP)       ((UP)->flags & SUNZILOG_FLAG_TX_STOPPED)
 119 #define ZS_TX_ACTIVE(UP)        ((UP)->flags & SUNZILOG_FLAG_TX_ACTIVE)
 120
 121 /* Reading and writing Zilog8530 registers.  The delays are to make this
 122  * driver work on the Sun4 which needs a settling delay after each chip
 123  * register access, other machines handle this in hardware via auxiliary
 124  * flip-flops which implement the settle time we do in software.
 125  *
 126  * The port lock must be held and local IRQs must be disabled
 127  * when {read,write}_zsreg is invoked.
 128  */
 129 static unsigned char read_zsreg(struct zilog_channel __iomem *channel,
 130                                 unsigned char reg)
 131 {
 132         unsigned char retval;
 133
 134         writeb(reg, &channel->control);
 135         ZSDELAY();
 136         retval = readb(&channel->control);
 137         ZSDELAY();
 138
 139         return retval;
 140 }
 141
 142 static void write_zsreg(struct zilog_channel __iomem *channel,
 143                         unsigned char reg, unsigned char value)
 144 {
 145         writeb(reg, &channel->control);
 146         ZSDELAY();
 147         writeb(value, &channel->control);
 148         ZSDELAY();
 149 }
 150
 151 static void sunzilog_clear_fifo(struct zilog_channel __iomem *channel)
 152 {
 153         int i;
 154
 155         for (i = 0; i < 32; i++) {
 156                 unsigned char regval;
 157
 158                 regval = readb(&channel->control);
 159                 ZSDELAY();
 160                 if (regval & Rx_CH_AV)
 161                         break;
 162
 163                 regval = read_zsreg(channel, R1);
 164                 readb(&channel->data);
 165                 ZSDELAY();
 166
 167                 if (regval & (PAR_ERR | Rx_OVR | CRC_ERR)) {
 168                         writeb(ERR_RES, &channel->control);
 169                         ZSDELAY();
 170                         ZS_WSYNC(channel);
 171                 }
 172         }
 173 }
 174
 175 /* This function must only be called when the TX is not busy.  The UART
 176  * port lock must be held and local interrupts disabled.
 177  */
 178 static int __load_zsregs(struct zilog_channel __iomem *channel, unsigned char *regs)
 179 {
 180         int i;
 181         int escc;
 182         unsigned char r15;
 183
 184         /* Let pending transmits finish.  */
 185         for (i = 0; i < 1000; i++) {
 186                 unsigned char stat = read_zsreg(channel, R1);
 187                 if (stat & ALL_SNT)
 188                         break;
 189                 udelay(100);
 190         }
 191
 192         writeb(ERR_RES, &channel->control);
 193         ZSDELAY();
 194         ZS_WSYNC(channel);
 195
 196         sunzilog_clear_fifo(channel);
 197
 198         /* Disable all interrupts.  */
 199         write_zsreg(channel, R1,
 200                     regs[R1] & ~(RxINT_MASK | TxINT_ENAB | EXT_INT_ENAB));
 201
 202         /* Set parity, sync config, stop bits, and clock divisor.  */
 203         write_zsreg(channel, R4, regs[R4]);
 204
 205         /* Set misc. TX/RX control bits.  */
 206         write_zsreg(channel, R10, regs[R10]);
 207
 208         /* Set TX/RX controls sans the enable bits.  */
 209         write_zsreg(channel, R3, regs[R3] & ~RxENAB);
 210         write_zsreg(channel, R5, regs[R5] & ~TxENAB);
 211
 212         /* Synchronous mode config.  */
 213         write_zsreg(channel, R6, regs[R6]);
 214         write_zsreg(channel, R7, regs[R7]);
 215
 216         /* Don't mess with the interrupt vector (R2, unused by us) and
 217          * master interrupt control (R9).  We make sure this is setup
 218          * properly at probe time then never touch it again.
 219          */
 220
 221         /* Disable baud generator.  */
 222         write_zsreg(channel, R14, regs[R14] & ~BRENAB);
 223
 224         /* Clock mode control.  */
 225         write_zsreg(channel, R11, regs[R11]);
 226
 227         /* Lower and upper byte of baud rate generator divisor.  */
 228         write_zsreg(channel, R12, regs[R12]);
 229         write_zsreg(channel, R13, regs[R13]);
 230
 231         /* Now rewrite R14, with BRENAB (if set).  */
 232         write_zsreg(channel, R14, regs[R14]);
 233
 234         /* External status interrupt control.  */
 235         write_zsreg(channel, R15, (regs[R15] | WR7pEN) & ~FIFOEN);
 236
 237         /* ESCC Extension Register */
 238         r15 = read_zsreg(channel, R15);
 239         if (r15 & 0x01) {
 240                 write_zsreg(channel, R7,  regs[R7p]);
 241
 242                 /* External status interrupt and FIFO control.  */
 243                 write_zsreg(channel, R15, regs[R15] & ~WR7pEN);
 244                 escc = 1;
 245         } else {
 246                  /* Clear FIFO bit case it is an issue */
 247                 regs[R15] &= ~FIFOEN;
 248                 escc = 0;
 249         }
 250
 251         /* Reset external status interrupts.  */
 252         write_zsreg(channel, R0, RES_EXT_INT); /* First Latch  */
 253         write_zsreg(channel, R0, RES_EXT_INT); /* Second Latch */
 254
 255         /* Rewrite R3/R5, this time without enables masked.  */
 256         write_zsreg(channel, R3, regs[R3]);
 257         write_zsreg(channel, R5, regs[R5]);
 258
 259         /* Rewrite R1, this time without IRQ enabled masked.  */
 260         write_zsreg(channel, R1, regs[R1]);
 261
 262         return escc;
 263 }
 264
 265 /* Reprogram the Zilog channel HW registers with the copies found in the
 266  * software state struct.  If the transmitter is busy, we defer this update
 267  * until the next TX complete interrupt.  Else, we do it right now.
 268  *
 269  * The UART port lock must be held and local interrupts disabled.
 270  */
 271 static void sunzilog_maybe_update_regs(struct uart_sunzilog_port *up,
 272                                        struct zilog_channel __iomem *channel)
 273 {
 274         if (!ZS_REGS_HELD(up)) {
 275                 if (ZS_TX_ACTIVE(up)) {
 276                         up->flags |= SUNZILOG_FLAG_REGS_HELD;
 277                 } else {
 278                         __load_zsregs(channel, up->curregs);
 279                 }
 280         }
 281 }
 282
 283 static void sunzilog_change_mouse_baud(struct uart_sunzilog_port *up)
 284 {
 285         unsigned int cur_cflag = up->cflag;
 286         int brg, new_baud;
 287
 288         up->cflag &= ~CBAUD;
 289         up->cflag |= suncore_mouse_baud_cflag_next(cur_cflag, &new_baud);
 290
 291         brg = BPS_TO_BRG(new_baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
 292         up->curregs[R12] = (brg & 0xff);
 293         up->curregs[R13] = (brg >> 8) & 0xff;
 294         sunzilog_maybe_update_regs(up, ZILOG_CHANNEL_FROM_PORT(&up->port));
 295 }
 296
 297 static void sunzilog_kbdms_receive_chars(struct uart_sunzilog_port *up,
 298                                          unsigned char ch, int is_break)
 299 {
 300         if (ZS_IS_KEYB(up)) {
 301                 /* Stop-A is handled by drivers/char/keyboard.c now. */
 302 #ifdef CONFIG_SERIO
 303                 if (up->serio_open)
 304                         serio_interrupt(&up->serio, ch, 0);
 305 #endif
 306         } else if (ZS_IS_MOUSE(up)) {
 307                 int ret = suncore_mouse_baud_detection(ch, is_break);
 308
 309                 switch (ret) {
 310                 case 2:
 311                         sunzilog_change_mouse_baud(up);
 312                         /* fallthru */
 313                 case 1:
 314                         break;
 315
 316                 case 0:
 317 #ifdef CONFIG_SERIO
 318                         if (up->serio_open)
 319                                 serio_interrupt(&up->serio, ch, 0);
 320 #endif
 321                         break;
 322                 }
 323         }
 324 }
 325
 326 static struct tty_port *
 327 sunzilog_receive_chars(struct uart_sunzilog_port *up,
 328                        struct zilog_channel __iomem *channel)
 329 {
 330         struct tty_port *port = NULL;
 331         unsigned char ch, r1, flag;
 332
 333         if (up->port.state != NULL)             /* Unopened serial console */
 334                 port = &up->port.state->port;
 335
 336         for (;;) {
 337
 338                 r1 = read_zsreg(channel, R1);
 339                 if (r1 & (PAR_ERR | Rx_OVR | CRC_ERR)) {
 340                         writeb(ERR_RES, &channel->control);
 341                         ZSDELAY();
 342                         ZS_WSYNC(channel);
 343                 }
 344
 345                 ch = readb(&channel->control);
 346                 ZSDELAY();
 347
 348                 /* This funny hack depends upon BRK_ABRT not interfering
 349                  * with the other bits we care about in R1.
 350                  */
 351                 if (ch & BRK_ABRT)
 352                         r1 |= BRK_ABRT;
 353
 354                 if (!(ch & Rx_CH_AV))
 355                         break;
 356
 357                 ch = readb(&channel->data);
 358                 ZSDELAY();
 359
 360                 ch &= up->parity_mask;
 361
 362                 if (unlikely(ZS_IS_KEYB(up)) || unlikely(ZS_IS_MOUSE(up))) {
 363                         sunzilog_kbdms_receive_chars(up, ch, 0);
 364                         continue;
 365                 }
 366
 367                 /* A real serial line, record the character and status.  */
 368                 flag = TTY_NORMAL;
 369                 up->port.icount.rx++;
 370                 if (r1 & (BRK_ABRT | PAR_ERR | Rx_OVR | CRC_ERR)) {
 371                         if (r1 & BRK_ABRT) {
 372                                 r1 &= ~(PAR_ERR | CRC_ERR);
 373                                 up->port.icount.brk++;
 374                                 if (uart_handle_break(&up->port))
 375                                         continue;
 376                         }
 377                         else if (r1 & PAR_ERR)
 378                                 up->port.icount.parity++;
 379                         else if (r1 & CRC_ERR)
 380                                 up->port.icount.frame++;
 381                         if (r1 & Rx_OVR)
 382                                 up->port.icount.overrun++;
 383                         r1 &= up->port.read_status_mask;
 384                         if (r1 & BRK_ABRT)
 385                                 flag = TTY_BREAK;
 386                         else if (r1 & PAR_ERR)
 387                                 flag = TTY_PARITY;
 388                         else if (r1 & CRC_ERR)
 389                                 flag = TTY_FRAME;
 390                 }
 391                 if (uart_handle_sysrq_char(&up->port, ch) || !port)
 392                         continue;
 393
 394                 if (up->port.ignore_status_mask == 0xff ||
 395                     (r1 & up->port.ignore_status_mask) == 0) {
 396                         tty_insert_flip_char(port, ch, flag);
 397                 }
 398                 if (r1 & Rx_OVR)
 399                         tty_insert_flip_char(port, 0, TTY_OVERRUN);
 400         }
 401
 402         return port;
 403 }
 404
 405 static void sunzilog_status_handle(struct uart_sunzilog_port *up,
 406                                    struct zilog_channel __iomem *channel)
 407 {
 408         unsigned char status;
 409
 410         status = readb(&channel->control);
 411         ZSDELAY();
 412
 413         writeb(RES_EXT_INT, &channel->control);
 414         ZSDELAY();
 415         ZS_WSYNC(channel);
 416
 417         if (status & BRK_ABRT) {
 418                 if (ZS_IS_MOUSE(up))
 419                         sunzilog_kbdms_receive_chars(up, 0, 1);
 420                 if (ZS_IS_CONS(up)) {
 421                         /* Wait for BREAK to deassert to avoid potentially
 422                          * confusing the PROM.
 423                          */
 424                         while (1) {
 425                                 status = readb(&channel->control);
 426                                 ZSDELAY();
 427                                 if (!(status & BRK_ABRT))
 428                                         break;
 429                         }
 430                         sun_do_break();
 431                         return;
 432                 }
 433         }
 434
 435         if (ZS_WANTS_MODEM_STATUS(up)) {
 436                 if (status & SYNC)
 437                         up->port.icount.dsr++;
 438
 439                 /* The Zilog just gives us an interrupt when DCD/CTS/etc. change.
 440                  * But it does not tell us which bit has changed, we have to keep
 441                  * track of this ourselves.
 442                  */
 443                 if ((status ^ up->prev_status) ^ DCD)
 444                         uart_handle_dcd_change(&up->port,
 445                                                (status & DCD));
 446                 if ((status ^ up->prev_status) ^ CTS)
 447                         uart_handle_cts_change(&up->port,
 448                                                (status & CTS));
 449
 450                 wake_up_interruptible(&up->port.state->port.delta_msr_wait);
 451         }
 452
 453         up->prev_status = status;
 454 }
 455
 456 static void sunzilog_transmit_chars(struct uart_sunzilog_port *up,
 457                                     struct zilog_channel __iomem *channel)
 458 {
 459         struct circ_buf *xmit;
 460
 461         if (ZS_IS_CONS(up)) {
 462                 unsigned char status = readb(&channel->control);
 463                 ZSDELAY();
 464
 465                 /* TX still busy?  Just wait for the next TX done interrupt.
 466                  *
 467                  * It can occur because of how we do serial console writes.  It would
 468                  * be nice to transmit console writes just like we normally would for
 469                  * a TTY line. (ie. buffered and TX interrupt driven).  That is not
 470                  * easy because console writes cannot sleep.  One solution might be
 471                  * to poll on enough port->xmit space becoming free.  -DaveM
 472                  */
 473                 if (!(status & Tx_BUF_EMP))
 474                         return;
 475         }
 476
 477         up->flags &= ~SUNZILOG_FLAG_TX_ACTIVE;
 478
 479         if (ZS_REGS_HELD(up)) {
 480                 __load_zsregs(channel, up->curregs);
 481                 up->flags &= ~SUNZILOG_FLAG_REGS_HELD;
 482         }
 483
 484         if (ZS_TX_STOPPED(up)) {
 485                 up->flags &= ~SUNZILOG_FLAG_TX_STOPPED;
 486                 goto ack_tx_int;
 487         }
 488
 489         if (up->port.x_char) {
 490                 up->flags |= SUNZILOG_FLAG_TX_ACTIVE;
 491                 writeb(up->port.x_char, &channel->data);
 492                 ZSDELAY();
 493                 ZS_WSYNC(channel);
 494
 495                 up->port.icount.tx++;
 496                 up->port.x_char = 0;
 497                 return;
 498         }
 499
 500         if (up->port.state == NULL)
 501                 goto ack_tx_int;
 502         xmit = &up->port.state->xmit;
 503         if (uart_circ_empty(xmit))
 504                 goto ack_tx_int;
 505
 506         if (uart_tx_stopped(&up->port))
 507                 goto ack_tx_int;
 508
 509         up->flags |= SUNZILOG_FLAG_TX_ACTIVE;
 510         writeb(xmit->buf[xmit->tail], &channel->data);
 511         ZSDELAY();
 512         ZS_WSYNC(channel);
 513
 514         xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
 515         up->port.icount.tx++;
 516
 517         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 518                 uart_write_wakeup(&up->port);
 519
 520         return;
 521
 522 ack_tx_int:
 523         writeb(RES_Tx_P, &channel->control);
 524         ZSDELAY();
 525         ZS_WSYNC(channel);
 526 }
 527
 528 static irqreturn_t sunzilog_interrupt(int irq, void *dev_id)
 529 {
 530         struct uart_sunzilog_port *up = dev_id;
 531
 532         while (up) {
 533                 struct zilog_channel __iomem *channel
 534                         = ZILOG_CHANNEL_FROM_PORT(&up->port);
 535                 struct tty_port *port;
 536                 unsigned char r3;
 537
 538                 spin_lock(&up->port.lock);
 539                 r3 = read_zsreg(channel, R3);
 540
 541                 /* Channel A */
 542                 port = NULL;
 543                 if (r3 & (CHAEXT | CHATxIP | CHARxIP)) {
 544                         writeb(RES_H_IUS, &channel->control);
 545                         ZSDELAY();
 546                         ZS_WSYNC(channel);
 547
 548                         if (r3 & CHARxIP)
 549                                 port = sunzilog_receive_chars(up, channel);
 550                         if (r3 & CHAEXT)
 551                                 sunzilog_status_handle(up, channel);
 552                         if (r3 & CHATxIP)
 553                                 sunzilog_transmit_chars(up, channel);
 554                 }
 555                 spin_unlock(&up->port.lock);
 556
 557                 if (port)
 558                         tty_flip_buffer_push(port);
 559
 560                 /* Channel B */
 561                 up = up->next;
 562                 channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
 563
 564                 spin_lock(&up->port.lock);
 565                 port = NULL;
 566                 if (r3 & (CHBEXT | CHBTxIP | CHBRxIP)) {
 567                         writeb(RES_H_IUS, &channel->control);
 568                         ZSDELAY();
 569                         ZS_WSYNC(channel);
 570
 571                         if (r3 & CHBRxIP)
 572                                 port = sunzilog_receive_chars(up, channel);
 573                         if (r3 & CHBEXT)
 574                                 sunzilog_status_handle(up, channel);
 575                         if (r3 & CHBTxIP)
 576                                 sunzilog_transmit_chars(up, channel);
 577                 }
 578                 spin_unlock(&up->port.lock);
 579
 580                 if (port)
 581                         tty_flip_buffer_push(port);
 582
 583                 up = up->next;
 584         }
 585
 586         return IRQ_HANDLED;
 587 }
 588
 589 /* A convenient way to quickly get R0 status.  The caller must _not_ hold the
 590  * port lock, it is acquired here.
 591  */
 592 static __inline__ unsigned char sunzilog_read_channel_status(struct uart_port *port)
 593 {
 594         struct zilog_channel __iomem *channel;
 595         unsigned char status;
 596
 597         channel = ZILOG_CHANNEL_FROM_PORT(port);
 598         status = readb(&channel->control);
 599         ZSDELAY();
 600
 601         return status;
 602 }
 603
 604 /* The port lock is not held.  */
 605 static unsigned int sunzilog_tx_empty(struct uart_port *port)
 606 {
 607         unsigned long flags;
 608         unsigned char status;
 609         unsigned int ret;
 610
 611         spin_lock_irqsave(&port->lock, flags);
 612
 613         status = sunzilog_read_channel_status(port);
 614
 615         spin_unlock_irqrestore(&port->lock, flags);
 616
 617         if (status & Tx_BUF_EMP)
 618                 ret = TIOCSER_TEMT;
 619         else
 620                 ret = 0;
 621
 622         return ret;
 623 }
 624
 625 /* The port lock is held and interrupts are disabled.  */
 626 static unsigned int sunzilog_get_mctrl(struct uart_port *port)
 627 {
 628         unsigned char status;
 629         unsigned int ret;
 630
 631         status = sunzilog_read_channel_status(port);
 632
 633         ret = 0;
 634         if (status & DCD)
 635                 ret |= TIOCM_CAR;
 636         if (status & SYNC)
 637                 ret |= TIOCM_DSR;
 638         if (status & CTS)
 639                 ret |= TIOCM_CTS;
 640
 641         return ret;
 642 }
 643
 644 /* The port lock is held and interrupts are disabled.  */
 645 static void sunzilog_set_mctrl(struct uart_port *port, unsigned int mctrl)
 646 {
 647         struct uart_sunzilog_port *up =
 648                 container_of(port, struct uart_sunzilog_port, port);
 649         struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
 650         unsigned char set_bits, clear_bits;
 651
 652         set_bits = clear_bits = 0;
 653
 654         if (mctrl & TIOCM_RTS)
 655                 set_bits |= RTS;
 656         else
 657                 clear_bits |= RTS;
 658         if (mctrl & TIOCM_DTR)
 659                 set_bits |= DTR;
 660         else
 661                 clear_bits |= DTR;
 662
 663         /* NOTE: Not subject to 'transmitter active' rule.  */
 664         up->curregs[R5] |= set_bits;
 665         up->curregs[R5] &= ~clear_bits;
 666         write_zsreg(channel, R5, up->curregs[R5]);
 667 }
 668
 669 /* The port lock is held and interrupts are disabled.  */
 670 static void sunzilog_stop_tx(struct uart_port *port)
 671 {
 672         struct uart_sunzilog_port *up =
 673                 container_of(port, struct uart_sunzilog_port, port);
 674
 675         up->flags |= SUNZILOG_FLAG_TX_STOPPED;
 676 }
 677
 678 /* The port lock is held and interrupts are disabled.  */
 679 static void sunzilog_start_tx(struct uart_port *port)
 680 {
 681         struct uart_sunzilog_port *up =
 682                 container_of(port, struct uart_sunzilog_port, port);
 683         struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
 684         unsigned char status;
 685
 686         up->flags |= SUNZILOG_FLAG_TX_ACTIVE;
 687         up->flags &= ~SUNZILOG_FLAG_TX_STOPPED;
 688
 689         status = readb(&channel->control);
 690         ZSDELAY();
 691
 692         /* TX busy?  Just wait for the TX done interrupt.  */
 693         if (!(status & Tx_BUF_EMP))
 694                 return;
 695
 696         /* Send the first character to jump-start the TX done
 697          * IRQ sending engine.
 698          */
 699         if (port->x_char) {
 700                 writeb(port->x_char, &channel->data);
 701                 ZSDELAY();
 702                 ZS_WSYNC(channel);
 703
 704                 port->icount.tx++;
 705                 port->x_char = 0;
 706         } else {
 707                 struct circ_buf *xmit = &port->state->xmit;
 708
 709                 if (uart_circ_empty(xmit))
 710                         return;
 711                 writeb(xmit->buf[xmit->tail], &channel->data);
 712                 ZSDELAY();
 713                 ZS_WSYNC(channel);
 714
 715                 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
 716                 port->icount.tx++;
 717
 718                 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 719                         uart_write_wakeup(&up->port);
 720         }
 721 }
 722
 723 /* The port lock is held.  */
 724 static void sunzilog_stop_rx(struct uart_port *port)
 725 {
 726         struct uart_sunzilog_port *up = UART_ZILOG(port);
 727         struct zilog_channel __iomem *channel;
 728
 729         if (ZS_IS_CONS(up))
 730                 return;
 731
 732         channel = ZILOG_CHANNEL_FROM_PORT(port);
 733
 734         /* Disable all RX interrupts.  */
 735         up->curregs[R1] &= ~RxINT_MASK;
 736         sunzilog_maybe_update_regs(up, channel);
 737 }
 738
 739 /* The port lock is held.  */
 740 static void sunzilog_enable_ms(struct uart_port *port)
 741 {
 742         struct uart_sunzilog_port *up =
 743                 container_of(port, struct uart_sunzilog_port, port);
 744         struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
 745         unsigned char new_reg;
 746
 747         new_reg = up->curregs[R15] | (DCDIE | SYNCIE | CTSIE);
 748         if (new_reg != up->curregs[R15]) {
 749                 up->curregs[R15] = new_reg;
 750
 751                 /* NOTE: Not subject to 'transmitter active' rule.  */
 752                 write_zsreg(channel, R15, up->curregs[R15] & ~WR7pEN);
 753         }
 754 }
 755
 756 /* The port lock is not held.  */
 757 static void sunzilog_break_ctl(struct uart_port *port, int break_state)
 758 {
 759         struct uart_sunzilog_port *up =
 760                 container_of(port, struct uart_sunzilog_port, port);
 761         struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
 762         unsigned char set_bits, clear_bits, new_reg;
 763         unsigned long flags;
 764
 765         set_bits = clear_bits = 0;
 766
 767         if (break_state)
 768                 set_bits |= SND_BRK;
 769         else
 770                 clear_bits |= SND_BRK;
 771
 772         spin_lock_irqsave(&port->lock, flags);
 773
 774         new_reg = (up->curregs[R5] | set_bits) & ~clear_bits;
 775         if (new_reg != up->curregs[R5]) {
 776                 up->curregs[R5] = new_reg;
 777
 778                 /* NOTE: Not subject to 'transmitter active' rule.  */
 779                 write_zsreg(channel, R5, up->curregs[R5]);
 780         }
 781
 782         spin_unlock_irqrestore(&port->lock, flags);
 783 }
 784
 785 static void __sunzilog_startup(struct uart_sunzilog_port *up)
 786 {
 787         struct zilog_channel __iomem *channel;
 788
 789         channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
 790         up->prev_status = readb(&channel->control);
 791
 792         /* Enable receiver and transmitter.  */
 793         up->curregs[R3] |= RxENAB;
 794         up->curregs[R5] |= TxENAB;
 795
 796         up->curregs[R1] |= EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB;
 797         sunzilog_maybe_update_regs(up, channel);
 798 }
 799
 800 static int sunzilog_startup(struct uart_port *port)
 801 {
 802         struct uart_sunzilog_port *up = UART_ZILOG(port);
 803         unsigned long flags;
 804
 805         if (ZS_IS_CONS(up))
 806                 return 0;
 807
 808         spin_lock_irqsave(&port->lock, flags);
 809         __sunzilog_startup(up);
 810         spin_unlock_irqrestore(&port->lock, flags);
 811         return 0;
 812 }
 813
 814 /*
 815  * The test for ZS_IS_CONS is explained by the following e-mail:
 816  *****
 817  * From: Russell King <rmk@arm.linux.org.uk>
 818  * Date: Sun, 8 Dec 2002 10:18:38 +0000
 819  *
 820  * On Sun, Dec 08, 2002 at 02:43:36AM -0500, Pete Zaitcev wrote:
 821  * > I boot my 2.5 boxes using "console=ttyS0,9600" argument,
 822  * > and I noticed that something is not right with reference
 823  * > counting in this case. It seems that when the console
 824  * > is open by kernel initially, this is not accounted
 825  * > as an open, and uart_startup is not called.
 826  *
 827  * That is correct.  We are unable to call uart_startup when the serial
 828  * console is initialised because it may need to allocate memory (as
 829  * request_irq does) and the memory allocators may not have been
 830  * initialised.
 831  *
 832  * 1. initialise the port into a state where it can send characters in the
 833  *    console write method.
 834  *
 835  * 2. don't do the actual hardware shutdown in your shutdown() method (but
 836  *    do the normal software shutdown - ie, free irqs etc)
 837  *****
 838  */
 839 static void sunzilog_shutdown(struct uart_port *port)
 840 {
 841         struct uart_sunzilog_port *up = UART_ZILOG(port);
 842         struct zilog_channel __iomem *channel;
 843         unsigned long flags;
 844
 845         if (ZS_IS_CONS(up))
 846                 return;
 847
 848         spin_lock_irqsave(&port->lock, flags);
 849
 850         channel = ZILOG_CHANNEL_FROM_PORT(port);
 851
 852         /* Disable receiver and transmitter.  */
 853         up->curregs[R3] &= ~RxENAB;
 854         up->curregs[R5] &= ~TxENAB;
 855
 856         /* Disable all interrupts and BRK assertion.  */
 857         up->curregs[R1] &= ~(EXT_INT_ENAB | TxINT_ENAB | RxINT_MASK);
 858         up->curregs[R5] &= ~SND_BRK;
 859         sunzilog_maybe_update_regs(up, channel);
 860
 861         spin_unlock_irqrestore(&port->lock, flags);
 862 }
 863
 864 /* Shared by TTY driver and serial console setup.  The port lock is held
 865  * and local interrupts are disabled.
 866  */
 867 static void
 868 sunzilog_convert_to_zs(struct uart_sunzilog_port *up, unsigned int cflag,
 869                        unsigned int iflag, int brg)
 870 {
 871
 872         up->curregs[R10] = NRZ;
 873         up->curregs[R11] = TCBR | RCBR;
 874
 875         /* Program BAUD and clock source. */
 876         up->curregs[R4] &= ~XCLK_MASK;
 877         up->curregs[R4] |= X16CLK;
 878         up->curregs[R12] = brg & 0xff;
 879         up->curregs[R13] = (brg >> 8) & 0xff;
 880         up->curregs[R14] = BRSRC | BRENAB;
 881
 882         /* Character size, stop bits, and parity. */
 883         up->curregs[R3] &= ~RxN_MASK;
 884         up->curregs[R5] &= ~TxN_MASK;
 885         switch (cflag & CSIZE) {
 886         case CS5:
 887                 up->curregs[R3] |= Rx5;
 888                 up->curregs[R5] |= Tx5;
 889                 up->parity_mask = 0x1f;
 890                 break;
 891         case CS6:
 892                 up->curregs[R3] |= Rx6;
 893                 up->curregs[R5] |= Tx6;
 894                 up->parity_mask = 0x3f;
 895                 break;
 896         case CS7:
 897                 up->curregs[R3] |= Rx7;
 898                 up->curregs[R5] |= Tx7;
 899                 up->parity_mask = 0x7f;
 900                 break;
 901         case CS8:
 902         default:
 903                 up->curregs[R3] |= Rx8;
 904                 up->curregs[R5] |= Tx8;
 905                 up->parity_mask = 0xff;
 906                 break;
 907         }
 908         up->curregs[R4] &= ~0x0c;
 909         if (cflag & CSTOPB)
 910                 up->curregs[R4] |= SB2;
 911         else
 912                 up->curregs[R4] |= SB1;
 913         if (cflag & PARENB)
 914                 up->curregs[R4] |= PAR_ENAB;
 915         else
 916                 up->curregs[R4] &= ~PAR_ENAB;
 917         if (!(cflag & PARODD))
 918                 up->curregs[R4] |= PAR_EVEN;
 919         else
 920                 up->curregs[R4] &= ~PAR_EVEN;
 921
 922         up->port.read_status_mask = Rx_OVR;
 923         if (iflag & INPCK)
 924                 up->port.read_status_mask |= CRC_ERR | PAR_ERR;
 925         if (iflag & (IGNBRK | BRKINT | PARMRK))
 926                 up->port.read_status_mask |= BRK_ABRT;
 927
 928         up->port.ignore_status_mask = 0;
 929         if (iflag & IGNPAR)
 930                 up->port.ignore_status_mask |= CRC_ERR | PAR_ERR;
 931         if (iflag & IGNBRK) {
 932                 up->port.ignore_status_mask |= BRK_ABRT;
 933                 if (iflag & IGNPAR)
 934                         up->port.ignore_status_mask |= Rx_OVR;
 935         }
 936
 937         if ((cflag & CREAD) == 0)
 938                 up->port.ignore_status_mask = 0xff;
 939 }
 940
 941 /* The port lock is not held.  */
 942 static void
 943 sunzilog_set_termios(struct uart_port *port, struct ktermios *termios,
 944                      struct ktermios *old)
 945 {
 946         struct uart_sunzilog_port *up =
 947                 container_of(port, struct uart_sunzilog_port, port);
 948         unsigned long flags;
 949         int baud, brg;
 950
 951         baud = uart_get_baud_rate(port, termios, old, 1200, 76800);
 952
 953         spin_lock_irqsave(&up->port.lock, flags);
 954
 955         brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
 956
 957         sunzilog_convert_to_zs(up, termios->c_cflag, termios->c_iflag, brg);
 958
 959         if (UART_ENABLE_MS(&up->port, termios->c_cflag))
 960                 up->flags |= SUNZILOG_FLAG_MODEM_STATUS;
 961         else
 962                 up->flags &= ~SUNZILOG_FLAG_MODEM_STATUS;
 963
 964         up->cflag = termios->c_cflag;
 965
 966         sunzilog_maybe_update_regs(up, ZILOG_CHANNEL_FROM_PORT(port));
 967
 968         uart_update_timeout(port, termios->c_cflag, baud);
 969
 970         spin_unlock_irqrestore(&up->port.lock, flags);
 971 }
 972
 973 static const char *sunzilog_type(struct uart_port *port)
 974 {
 975         struct uart_sunzilog_port *up = UART_ZILOG(port);
 976
 977         return (up->flags & SUNZILOG_FLAG_ESCC) ? "zs (ESCC)" : "zs";
 978 }
 979
 980 /* We do not request/release mappings of the registers here, this
 981  * happens at early serial probe time.
 982  */
 983 static void sunzilog_release_port(struct uart_port *port)
 984 {
 985 }
 986
 987 static int sunzilog_request_port(struct uart_port *port)
 988 {
 989         return 0;
 990 }
 991
 992 /* These do not need to do anything interesting either.  */
 993 static void sunzilog_config_port(struct uart_port *port, int flags)
 994 {
 995 }
 996
 997 /* We do not support letting the user mess with the divisor, IRQ, etc. */
 998 static int sunzilog_verify_port(struct uart_port *port, struct serial_struct *ser)
 999 {
1000         return -EINVAL;
1001 }
1002
1003 #ifdef CONFIG_CONSOLE_POLL
1004 static int sunzilog_get_poll_char(struct uart_port *port)
1005 {
1006         unsigned char ch, r1;
1007         struct uart_sunzilog_port *up =
1008                 container_of(port, struct uart_sunzilog_port, port);
1009         struct zilog_channel __iomem *channel
1010                 = ZILOG_CHANNEL_FROM_PORT(&up->port);
1011
1012
1013         r1 = read_zsreg(channel, R1);
1014         if (r1 & (PAR_ERR | Rx_OVR | CRC_ERR)) {
1015                 writeb(ERR_RES, &channel->control);
1016                 ZSDELAY();
1017                 ZS_WSYNC(channel);
1018         }
1019
1020         ch = readb(&channel->control);
1021         ZSDELAY();
1022
1023         /* This funny hack depends upon BRK_ABRT not interfering
1024          * with the other bits we care about in R1.
1025          */
1026         if (ch & BRK_ABRT)
1027                 r1 |= BRK_ABRT;
1028
1029         if (!(ch & Rx_CH_AV))
1030                 return NO_POLL_CHAR;
1031
1032         ch = readb(&channel->data);
1033         ZSDELAY();
1034
1035         ch &= up->parity_mask;
1036         return ch;
1037 }
1038
1039 static void sunzilog_put_poll_char(struct uart_port *port,
1040                         unsigned char ch)
1041 {
1042         struct uart_sunzilog_port *up =
1043                 container_of(port, struct uart_sunzilog_port, port);
1044
1045         sunzilog_putchar(&up->port, ch);
1046 }
1047 #endif /* CONFIG_CONSOLE_POLL */
1048
1049 static struct uart_ops sunzilog_pops = {
1050         .tx_empty       =       sunzilog_tx_empty,
1051         .set_mctrl      =       sunzilog_set_mctrl,
1052         .get_mctrl      =       sunzilog_get_mctrl,
1053         .stop_tx        =       sunzilog_stop_tx,
1054         .start_tx       =       sunzilog_start_tx,
1055         .stop_rx        =       sunzilog_stop_rx,
1056         .enable_ms      =       sunzilog_enable_ms,
1057         .break_ctl      =       sunzilog_break_ctl,
1058         .startup        =       sunzilog_startup,
1059         .shutdown       =       sunzilog_shutdown,
1060         .set_termios    =       sunzilog_set_termios,
1061         .type           =       sunzilog_type,
1062         .release_port   =       sunzilog_release_port,
1063         .request_port   =       sunzilog_request_port,
1064         .config_port    =       sunzilog_config_port,
1065         .verify_port    =       sunzilog_verify_port,
1066 #ifdef CONFIG_CONSOLE_POLL
1067         .poll_get_char  =       sunzilog_get_poll_char,
1068         .poll_put_char  =       sunzilog_put_poll_char,
1069 #endif
1070 };
1071
1072 static int uart_chip_count;
1073 static struct uart_sunzilog_port *sunzilog_port_table;
1074 static struct zilog_layout __iomem **sunzilog_chip_regs;
1075
1076 static struct uart_sunzilog_port *sunzilog_irq_chain;
1077
1078 static struct uart_driver sunzilog_reg = {
1079         .owner          =       THIS_MODULE,
1080         .driver_name    =       "sunzilog",
1081         .dev_name       =       "ttyS",
1082         .major          =       TTY_MAJOR,
1083 };
1084
1085 static int __init sunzilog_alloc_tables(int num_sunzilog)
1086 {
1087         struct uart_sunzilog_port *up;
1088         unsigned long size;
1089         int num_channels = num_sunzilog * 2;
1090         int i;
1091
1092         size = num_channels * sizeof(struct uart_sunzilog_port);
1093         sunzilog_port_table = kzalloc(size, GFP_KERNEL);
1094         if (!sunzilog_port_table)
1095                 return -ENOMEM;
1096
1097         for (i = 0; i < num_channels; i++) {
1098                 up = &sunzilog_port_table[i];
1099
1100                 spin_lock_init(&up->port.lock);
1101
1102                 if (i == 0)
1103                         sunzilog_irq_chain = up;
1104
1105                 if (i < num_channels - 1)
1106                         up->next = up + 1;
1107                 else
1108                         up->next = NULL;
1109         }
1110
1111         size = num_sunzilog * sizeof(struct zilog_layout __iomem *);
1112         sunzilog_chip_regs = kzalloc(size, GFP_KERNEL);
1113         if (!sunzilog_chip_regs) {
1114                 kfree(sunzilog_port_table);
1115                 sunzilog_irq_chain = NULL;
1116                 return -ENOMEM;
1117         }
1118
1119         return 0;
1120 }
1121
1122 static void sunzilog_free_tables(void)
1123 {
1124         kfree(sunzilog_port_table);
1125         sunzilog_irq_chain = NULL;
1126         kfree(sunzilog_chip_regs);
1127 }
1128
1129 #define ZS_PUT_CHAR_MAX_DELAY   2000    /* 10 ms */
1130
1131 static void sunzilog_putchar(struct uart_port *port, int ch)
1132 {
1133         struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
1134         int loops = ZS_PUT_CHAR_MAX_DELAY;
1135
1136         /* This is a timed polling loop so do not switch the explicit
1137          * udelay with ZSDELAY as that is a NOP on some platforms.  -DaveM
1138          */
1139         do {
1140                 unsigned char val = readb(&channel->control);
1141                 if (val & Tx_BUF_EMP) {
1142                         ZSDELAY();
1143                         break;
1144                 }
1145                 udelay(5);
1146         } while (--loops);
1147
1148         writeb(ch, &channel->data);
1149         ZSDELAY();
1150         ZS_WSYNC(channel);
1151 }
1152
1153 #ifdef CONFIG_SERIO
1154
1155 static DEFINE_SPINLOCK(sunzilog_serio_lock);
1156
1157 static int sunzilog_serio_write(struct serio *serio, unsigned char ch)
1158 {
1159         struct uart_sunzilog_port *up = serio->port_data;
1160         unsigned long flags;
1161
1162         spin_lock_irqsave(&sunzilog_serio_lock, flags);
1163
1164         sunzilog_putchar(&up->port, ch);
1165
1166         spin_unlock_irqrestore(&sunzilog_serio_lock, flags);
1167
1168         return 0;
1169 }
1170
1171 static int sunzilog_serio_open(struct serio *serio)
1172 {
1173         struct uart_sunzilog_port *up = serio->port_data;
1174         unsigned long flags;
1175         int ret;
1176
1177         spin_lock_irqsave(&sunzilog_serio_lock, flags);
1178         if (!up->serio_open) {
1179                 up->serio_open = 1;
1180                 ret = 0;
1181         } else
1182                 ret = -EBUSY;
1183         spin_unlock_irqrestore(&sunzilog_serio_lock, flags);
1184
1185         return ret;
1186 }
1187
1188 static void sunzilog_serio_close(struct serio *serio)
1189 {
1190         struct uart_sunzilog_port *up = serio->port_data;
1191         unsigned long flags;
1192
1193         spin_lock_irqsave(&sunzilog_serio_lock, flags);
1194         up->serio_open = 0;
1195         spin_unlock_irqrestore(&sunzilog_serio_lock, flags);
1196 }
1197
1198 #endif /* CONFIG_SERIO */
1199
1200 #ifdef CONFIG_SERIAL_SUNZILOG_CONSOLE
1201 static void
1202 sunzilog_console_write(struct console *con, const char *s, unsigned int count)
1203 {
1204         struct uart_sunzilog_port *up = &sunzilog_port_table[con->index];
1205         unsigned long flags;
1206         int locked = 1;
1207
1208         if (up->port.sysrq || oops_in_progress)
1209                 locked = spin_trylock_irqsave(&up->port.lock, flags);
1210         else
1211                 spin_lock_irqsave(&up->port.lock, flags);
1212
1213         uart_console_write(&up->port, s, count, sunzilog_putchar);
1214         udelay(2);
1215
1216         if (locked)
1217                 spin_unlock_irqrestore(&up->port.lock, flags);
1218 }
1219
1220 static int __init sunzilog_console_setup(struct console *con, char *options)
1221 {
1222         struct uart_sunzilog_port *up = &sunzilog_port_table[con->index];
1223         unsigned long flags;
1224         int baud, brg;
1225
1226         if (up->port.type != PORT_SUNZILOG)
1227                 return -1;
1228
1229         printk(KERN_INFO "Console: ttyS%d (SunZilog zs%d)\n",
1230                (sunzilog_reg.minor - 64) + con->index, con->index);
1231
1232         /* Get firmware console settings.  */
1233         sunserial_console_termios(con, up->port.dev->of_node);
1234
1235         /* Firmware console speed is limited to 150-->38400 baud so
1236          * this hackish cflag thing is OK.
1237          */
1238         switch (con->cflag & CBAUD) {
1239         case B150: baud = 150; break;
1240         case B300: baud = 300; break;
1241         case B600: baud = 600; break;
1242         case B1200: baud = 1200; break;
1243         case B2400: baud = 2400; break;
1244         case B4800: baud = 4800; break;
1245         default: case B9600: baud = 9600; break;
1246         case B19200: baud = 19200; break;
1247         case B38400: baud = 38400; break;
1248         }
1249
1250         brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
1251
1252         spin_lock_irqsave(&up->port.lock, flags);
1253
1254         up->curregs[R15] |= BRKIE;
1255         sunzilog_convert_to_zs(up, con->cflag, 0, brg);
1256
1257         sunzilog_set_mctrl(&up->port, TIOCM_DTR | TIOCM_RTS);
1258         __sunzilog_startup(up);
1259
1260         spin_unlock_irqrestore(&up->port.lock, flags);
1261
1262         return 0;
1263 }
1264
1265 static struct console sunzilog_console_ops = {
1266         .name   =       "ttyS",
1267         .write  =       sunzilog_console_write,
1268         .device =       uart_console_device,
1269         .setup  =       sunzilog_console_setup,
1270         .flags  =       CON_PRINTBUFFER,
1271         .index  =       -1,
1272         .data   =       &sunzilog_reg,
1273 };
1274
1275 static inline struct console *SUNZILOG_CONSOLE(void)
1276 {
1277         return &sunzilog_console_ops;
1278 }
1279
1280 #else
1281 #define SUNZILOG_CONSOLE()      (NULL)
1282 #endif
1283
1284 static void sunzilog_init_kbdms(struct uart_sunzilog_port *up)
1285 {
1286         int baud, brg;
1287
1288         if (up->flags & SUNZILOG_FLAG_CONS_KEYB) {
1289                 up->cflag = B1200 | CS8 | CLOCAL | CREAD;
1290                 baud = 1200;
1291         } else {
1292                 up->cflag = B4800 | CS8 | CLOCAL | CREAD;
1293                 baud = 4800;
1294         }
1295
1296         up->curregs[R15] |= BRKIE;
1297         brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
1298         sunzilog_convert_to_zs(up, up->cflag, 0, brg);
1299         sunzilog_set_mctrl(&up->port, TIOCM_DTR | TIOCM_RTS);
1300         __sunzilog_startup(up);
1301 }
1302
1303 #ifdef CONFIG_SERIO
1304 static void sunzilog_register_serio(struct uart_sunzilog_port *up)
1305 {
1306         struct serio *serio = &up->serio;
1307
1308         serio->port_data = up;
1309
1310         serio->id.type = SERIO_RS232;
1311         if (up->flags & SUNZILOG_FLAG_CONS_KEYB) {
1312                 serio->id.proto = SERIO_SUNKBD;
1313                 strlcpy(serio->name, "zskbd", sizeof(serio->name));
1314         } else {
1315                 serio->id.proto = SERIO_SUN;
1316                 serio->id.extra = 1;
1317                 strlcpy(serio->name, "zsms", sizeof(serio->name));
1318         }
1319         strlcpy(serio->phys,
1320                 ((up->flags & SUNZILOG_FLAG_CONS_KEYB) ?
1321                  "zs/serio0" : "zs/serio1"),
1322                 sizeof(serio->phys));
1323
1324         serio->write = sunzilog_serio_write;
1325         serio->open = sunzilog_serio_open;
1326         serio->close = sunzilog_serio_close;
1327         serio->dev.parent = up->port.dev;
1328
1329         serio_register_port(serio);
1330 }
1331 #endif
1332
1333 static void sunzilog_init_hw(struct uart_sunzilog_port *up)
1334 {
1335         struct zilog_channel __iomem *channel;
1336         unsigned long flags;
1337         int baud, brg;
1338
1339         channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
1340
1341         spin_lock_irqsave(&up->port.lock, flags);
1342         if (ZS_IS_CHANNEL_A(up)) {
1343                 write_zsreg(channel, R9, FHWRES);
1344                 ZSDELAY_LONG();
1345                 (void) read_zsreg(channel, R0);
1346         }
1347
1348         if (up->flags & (SUNZILOG_FLAG_CONS_KEYB |
1349                          SUNZILOG_FLAG_CONS_MOUSE)) {
1350                 up->curregs[R1] = EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB;
1351                 up->curregs[R4] = PAR_EVEN | X16CLK | SB1;
1352                 up->curregs[R3] = RxENAB | Rx8;
1353                 up->curregs[R5] = TxENAB | Tx8;
1354                 up->curregs[R6] = 0x00; /* SDLC Address */
1355                 up->curregs[R7] = 0x7E; /* SDLC Flag    */
1356                 up->curregs[R9] = NV;
1357                 up->curregs[R7p] = 0x00;
1358                 sunzilog_init_kbdms(up);
1359                 /* Only enable interrupts if an ISR handler available */
1360                 if (up->flags & SUNZILOG_FLAG_ISR_HANDLER)
1361                         up->curregs[R9] |= MIE;
1362                 write_zsreg(channel, R9, up->curregs[R9]);
1363         } else {
1364                 /* Normal serial TTY. */
1365                 up->parity_mask = 0xff;
1366                 up->curregs[R1] = EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB;
1367                 up->curregs[R4] = PAR_EVEN | X16CLK | SB1;
1368                 up->curregs[R3] = RxENAB | Rx8;
1369                 up->curregs[R5] = TxENAB | Tx8;
1370                 up->curregs[R6] = 0x00; /* SDLC Address */
1371                 up->curregs[R7] = 0x7E; /* SDLC Flag    */
1372                 up->curregs[R9] = NV;
1373                 up->curregs[R10] = NRZ;
1374                 up->curregs[R11] = TCBR | RCBR;
1375                 baud = 9600;
1376                 brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
1377                 up->curregs[R12] = (brg & 0xff);
1378                 up->curregs[R13] = (brg >> 8) & 0xff;
1379                 up->curregs[R14] = BRSRC | BRENAB;
1380                 up->curregs[R15] = FIFOEN; /* Use FIFO if on ESCC */
1381                 up->curregs[R7p] = TxFIFO_LVL | RxFIFO_LVL;
1382                 if (__load_zsregs(channel, up->curregs)) {
1383                         up->flags |= SUNZILOG_FLAG_ESCC;
1384                 }
1385                 /* Only enable interrupts if an ISR handler available */
1386                 if (up->flags & SUNZILOG_FLAG_ISR_HANDLER)
1387                         up->curregs[R9] |= MIE;
1388                 write_zsreg(channel, R9, up->curregs[R9]);
1389         }
1390
1391         spin_unlock_irqrestore(&up->port.lock, flags);
1392
1393 #ifdef CONFIG_SERIO
1394         if (up->flags & (SUNZILOG_FLAG_CONS_KEYB |
1395                          SUNZILOG_FLAG_CONS_MOUSE))
1396                 sunzilog_register_serio(up);
1397 #endif
1398 }
1399
1400 static int zilog_irq;
1401
1402 static int zs_probe(struct platform_device *op)
1403 {
1404         static int kbm_inst, uart_inst;
1405         int inst;
1406         struct uart_sunzilog_port *up;
1407         struct zilog_layout __iomem *rp;
1408         int keyboard_mouse = 0;
1409         int err;
1410
1411         if (of_find_property(op->dev.of_node, "keyboard", NULL))
1412                 keyboard_mouse = 1;
1413
1414         /* uarts must come before keyboards/mice */
1415         if (keyboard_mouse)
1416                 inst = uart_chip_count + kbm_inst;
1417         else
1418                 inst = uart_inst;
1419
1420         sunzilog_chip_regs[inst] = of_ioremap(&op->resource[0], 0,
1421                                               sizeof(struct zilog_layout),
1422                                               "zs");
1423         if (!sunzilog_chip_regs[inst])
1424                 return -ENOMEM;
1425
1426         rp = sunzilog_chip_regs[inst];
1427
1428         if (!zilog_irq)
1429                 zilog_irq = op->archdata.irqs[0];
1430
1431         up = &sunzilog_port_table[inst * 2];
1432
1433         /* Channel A */
1434         up[0].port.mapbase = op->resource[0].start + 0x00;
1435         up[0].port.membase = (void __iomem *) &rp->channelA;
1436         up[0].port.iotype = UPIO_MEM;
1437         up[0].port.irq = op->archdata.irqs[0];
1438         up[0].port.uartclk = ZS_CLOCK;
1439         up[0].port.fifosize = 1;
1440         up[0].port.ops = &sunzilog_pops;
1441         up[0].port.type = PORT_SUNZILOG;
1442         up[0].port.flags = 0;
1443         up[0].port.line = (inst * 2) + 0;
1444         up[0].port.dev = &op->dev;
1445         up[0].flags |= SUNZILOG_FLAG_IS_CHANNEL_A;
1446         if (keyboard_mouse)
1447                 up[0].flags |= SUNZILOG_FLAG_CONS_KEYB;
1448         sunzilog_init_hw(&up[0]);
1449
1450         /* Channel B */
1451         up[1].port.mapbase = op->resource[0].start + 0x04;
1452         up[1].port.membase = (void __iomem *) &rp->channelB;
1453         up[1].port.iotype = UPIO_MEM;
1454         up[1].port.irq = op->archdata.irqs[0];
1455         up[1].port.uartclk = ZS_CLOCK;
1456         up[1].port.fifosize = 1;
1457         up[1].port.ops = &sunzilog_pops;
1458         up[1].port.type = PORT_SUNZILOG;
1459         up[1].port.flags = 0;
1460         up[1].port.line = (inst * 2) + 1;
1461         up[1].port.dev = &op->dev;
1462         up[1].flags |= 0;
1463         if (keyboard_mouse)
1464                 up[1].flags |= SUNZILOG_FLAG_CONS_MOUSE;
1465         sunzilog_init_hw(&up[1]);
1466
1467         if (!keyboard_mouse) {
1468                 if (sunserial_console_match(SUNZILOG_CONSOLE(), op->dev.of_node,
1469                                             &sunzilog_reg, up[0].port.line,
1470                                             false))
1471                         up->flags |= SUNZILOG_FLAG_IS_CONS;
1472                 err = uart_add_one_port(&sunzilog_reg, &up[0].port);
1473                 if (err) {
1474                         of_iounmap(&op->resource[0],
1475                                    rp, sizeof(struct zilog_layout));
1476                         return err;
1477                 }
1478                 if (sunserial_console_match(SUNZILOG_CONSOLE(), op->dev.of_node,
1479                                             &sunzilog_reg, up[1].port.line,
1480                                             false))
1481                         up->flags |= SUNZILOG_FLAG_IS_CONS;
1482                 err = uart_add_one_port(&sunzilog_reg, &up[1].port);
1483                 if (err) {
1484                         uart_remove_one_port(&sunzilog_reg, &up[0].port);
1485                         of_iounmap(&op->resource[0],
1486                                    rp, sizeof(struct zilog_layout));
1487                         return err;
1488                 }
1489                 uart_inst++;
1490         } else {
1491                 printk(KERN_INFO "%s: Keyboard at MMIO 0x%llx (irq = %d) "
1492                        "is a %s\n",
1493                        dev_name(&op->dev),
1494                        (unsigned long long) up[0].port.mapbase,
1495                        op->archdata.irqs[0], sunzilog_type(&up[0].port));
1496                 printk(KERN_INFO "%s: Mouse at MMIO 0x%llx (irq = %d) "
1497                        "is a %s\n",
1498                        dev_name(&op->dev),
1499                        (unsigned long long) up[1].port.mapbase,
1500                        op->archdata.irqs[0], sunzilog_type(&up[1].port));
1501                 kbm_inst++;
1502         }
1503
1504         platform_set_drvdata(op, &up[0]);
1505
1506         return 0;
1507 }
1508
1509 static void zs_remove_one(struct uart_sunzilog_port *up)
1510 {
1511         if (ZS_IS_KEYB(up) || ZS_IS_MOUSE(up)) {
1512 #ifdef CONFIG_SERIO
1513                 serio_unregister_port(&up->serio);
1514 #endif
1515         } else
1516                 uart_remove_one_port(&sunzilog_reg, &up->port);
1517 }
1518
1519 static int zs_remove(struct platform_device *op)
1520 {
1521         struct uart_sunzilog_port *up = platform_get_drvdata(op);
1522         struct zilog_layout __iomem *regs;
1523
1524         zs_remove_one(&up[0]);
1525         zs_remove_one(&up[1]);
1526
1527         regs = sunzilog_chip_regs[up[0].port.line / 2];
1528         of_iounmap(&op->resource[0], regs, sizeof(struct zilog_layout));
1529
1530         return 0;
1531 }
1532
1533 static const struct of_device_id zs_match[] = {
1534         {
1535                 .name = "zs",
1536         },
1537         {},
1538 };
1539 MODULE_DEVICE_TABLE(of, zs_match);
1540
1541 static struct platform_driver zs_driver = {
1542         .driver = {
1543                 .name = "zs",
1544                 .of_match_table = zs_match,
1545         },
1546         .probe          = zs_probe,
1547         .remove         = zs_remove,
1548 };
1549
1550 static int __init sunzilog_init(void)
1551 {
1552         struct device_node *dp;
1553         int err;
1554         int num_keybms = 0;
1555         int num_sunzilog = 0;
1556
1557         for_each_node_by_name(dp, "zs") {
1558                 num_sunzilog++;
1559                 if (of_find_property(dp, "keyboard", NULL))
1560                         num_keybms++;
1561         }
1562
1563         if (num_sunzilog) {
1564                 err = sunzilog_alloc_tables(num_sunzilog);
1565                 if (err)
1566                         goto out;
1567
1568                 uart_chip_count = num_sunzilog - num_keybms;
1569
1570                 err = sunserial_register_minors(&sunzilog_reg,
1571                                                 uart_chip_count * 2);
1572                 if (err)
1573                         goto out_free_tables;
1574         }
1575
1576         err = platform_driver_register(&zs_driver);
1577         if (err)
1578                 goto out_unregister_uart;
1579
1580         if (zilog_irq) {
1581                 struct uart_sunzilog_port *up = sunzilog_irq_chain;
1582                 err = request_irq(zilog_irq, sunzilog_interrupt, IRQF_SHARED,
1583                                   "zs", sunzilog_irq_chain);
1584                 if (err)
1585                         goto out_unregister_driver;
1586
1587                 /* Enable Interrupts */
1588                 while (up) {
1589                         struct zilog_channel __iomem *channel;
1590
1591                         /* printk (KERN_INFO "Enable IRQ for ZILOG Hardware %p\n", up); */
1592                         channel          = ZILOG_CHANNEL_FROM_PORT(&up->port);
1593                         up->flags       |= SUNZILOG_FLAG_ISR_HANDLER;
1594                         up->curregs[R9] |= MIE;
1595                         write_zsreg(channel, R9, up->curregs[R9]);
1596                         up = up->next;
1597                 }
1598         }
1599
1600 out:
1601         return err;
1602
1603 out_unregister_driver:
1604         platform_driver_unregister(&zs_driver);
1605
1606 out_unregister_uart:
1607         if (num_sunzilog) {
1608                 sunserial_unregister_minors(&sunzilog_reg, num_sunzilog);
1609                 sunzilog_reg.cons = NULL;
1610         }
1611
1612 out_free_tables:
1613         sunzilog_free_tables();
1614         goto out;
1615 }
1616
1617 static void __exit sunzilog_exit(void)
1618 {
1619         platform_driver_unregister(&zs_driver);
1620
1621         if (zilog_irq) {
1622                 struct uart_sunzilog_port *up = sunzilog_irq_chain;
1623
1624                 /* Disable Interrupts */
1625                 while (up) {
1626                         struct zilog_channel __iomem *channel;
1627
1628                         /* printk (KERN_INFO "Disable IRQ for ZILOG Hardware %p\n", up); */
1629                         channel          = ZILOG_CHANNEL_FROM_PORT(&up->port);
1630                         up->flags       &= ~SUNZILOG_FLAG_ISR_HANDLER;
1631                         up->curregs[R9] &= ~MIE;
1632                         write_zsreg(channel, R9, up->curregs[R9]);
1633                         up = up->next;
1634                 }
1635
1636                 free_irq(zilog_irq, sunzilog_irq_chain);
1637                 zilog_irq = 0;
1638         }
1639
1640         if (sunzilog_reg.nr) {
1641                 sunserial_unregister_minors(&sunzilog_reg, sunzilog_reg.nr);
1642                 sunzilog_free_tables();
1643         }
1644 }
1645
1646 module_init(sunzilog_init);
1647 module_exit(sunzilog_exit);
1648
1649 MODULE_AUTHOR("David S. Miller");
1650 MODULE_DESCRIPTION("Sun Zilog serial port driver");
1651 MODULE_VERSION("2.0");
1652 MODULE_LICENSE("GPL");