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