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