1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Driver for PowerMac Z85c30 based ESCC cell found in the 4 * "macio" ASICs of various PowerMac models 5 * 6 * Copyright (C) 2003 Ben. Herrenschmidt (benh@kernel.crashing.org) 7 * 8 * Derived from drivers/macintosh/macserial.c by Paul Mackerras 9 * and drivers/serial/sunzilog.c by David S. Miller 10 * 11 * Hrm... actually, I ripped most of sunzilog (Thanks David !) and 12 * adapted special tweaks needed for us. I don't think it's worth 13 * merging back those though. The DMA code still has to get in 14 * and once done, I expect that driver to remain fairly stable in 15 * the long term, unless we change the driver model again... 16 * 17 * 2004-08-06 Harald Welte <laforge@gnumonks.org> 18 * - Enable BREAK interrupt 19 * - Add support for sysreq 20 * 21 * TODO: - Add DMA support 22 * - Defer port shutdown to a few seconds after close 23 * - maybe put something right into uap->clk_divisor 24 */ 25 26 #undef DEBUG 27 #undef DEBUG_HARD 28 #undef USE_CTRL_O_SYSRQ 29 30 #include <linux/module.h> 31 #include <linux/tty.h> 32 33 #include <linux/tty_flip.h> 34 #include <linux/major.h> 35 #include <linux/string.h> 36 #include <linux/fcntl.h> 37 #include <linux/mm.h> 38 #include <linux/kernel.h> 39 #include <linux/delay.h> 40 #include <linux/init.h> 41 #include <linux/console.h> 42 #include <linux/adb.h> 43 #include <linux/pmu.h> 44 #include <linux/bitops.h> 45 #include <linux/sysrq.h> 46 #include <linux/mutex.h> 47 #include <linux/of_address.h> 48 #include <linux/of_irq.h> 49 #include <asm/sections.h> 50 #include <linux/io.h> 51 #include <asm/irq.h> 52 53 #ifdef CONFIG_PPC_PMAC 54 #include <asm/prom.h> 55 #include <asm/machdep.h> 56 #include <asm/pmac_feature.h> 57 #include <asm/dbdma.h> 58 #include <asm/macio.h> 59 #else 60 #include <linux/platform_device.h> 61 #define of_machine_is_compatible(x) (0) 62 #endif 63 64 #include <linux/serial.h> 65 #include <linux/serial_core.h> 66 67 #include "pmac_zilog.h" 68 69 /* Not yet implemented */ 70 #undef HAS_DBDMA 71 72 static char version[] __initdata = "pmac_zilog: 0.6 (Benjamin Herrenschmidt <benh@kernel.crashing.org>)"; 73 MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>"); 74 MODULE_DESCRIPTION("Driver for the Mac and PowerMac serial ports."); 75 MODULE_LICENSE("GPL"); 76 77 #ifdef CONFIG_SERIAL_PMACZILOG_TTYS 78 #define PMACZILOG_MAJOR TTY_MAJOR 79 #define PMACZILOG_MINOR 64 80 #define PMACZILOG_NAME "ttyS" 81 #else 82 #define PMACZILOG_MAJOR 204 83 #define PMACZILOG_MINOR 192 84 #define PMACZILOG_NAME "ttyPZ" 85 #endif 86 87 #define pmz_debug(fmt, arg...) pr_debug("ttyPZ%d: " fmt, uap->port.line, ## arg) 88 #define pmz_error(fmt, arg...) pr_err("ttyPZ%d: " fmt, uap->port.line, ## arg) 89 #define pmz_info(fmt, arg...) pr_info("ttyPZ%d: " fmt, uap->port.line, ## arg) 90 91 /* 92 * For the sake of early serial console, we can do a pre-probe 93 * (optional) of the ports at rather early boot time. 94 */ 95 static struct uart_pmac_port pmz_ports[MAX_ZS_PORTS]; 96 static int pmz_ports_count; 97 98 static struct uart_driver pmz_uart_reg = { 99 .owner = THIS_MODULE, 100 .driver_name = PMACZILOG_NAME, 101 .dev_name = PMACZILOG_NAME, 102 .major = PMACZILOG_MAJOR, 103 .minor = PMACZILOG_MINOR, 104 }; 105 106 107 /* 108 * Load all registers to reprogram the port 109 * This function must only be called when the TX is not busy. The UART 110 * port lock must be held and local interrupts disabled. 111 */ 112 static void pmz_load_zsregs(struct uart_pmac_port *uap, u8 *regs) 113 { 114 int i; 115 116 /* Let pending transmits finish. */ 117 for (i = 0; i < 1000; i++) { 118 unsigned char stat = read_zsreg(uap, R1); 119 if (stat & ALL_SNT) 120 break; 121 udelay(100); 122 } 123 124 ZS_CLEARERR(uap); 125 zssync(uap); 126 ZS_CLEARFIFO(uap); 127 zssync(uap); 128 ZS_CLEARERR(uap); 129 130 /* Disable all interrupts. */ 131 write_zsreg(uap, R1, 132 regs[R1] & ~(RxINT_MASK | TxINT_ENAB | EXT_INT_ENAB)); 133 134 /* Set parity, sync config, stop bits, and clock divisor. */ 135 write_zsreg(uap, R4, regs[R4]); 136 137 /* Set misc. TX/RX control bits. */ 138 write_zsreg(uap, R10, regs[R10]); 139 140 /* Set TX/RX controls sans the enable bits. */ 141 write_zsreg(uap, R3, regs[R3] & ~RxENABLE); 142 write_zsreg(uap, R5, regs[R5] & ~TxENABLE); 143 144 /* now set R7 "prime" on ESCC */ 145 write_zsreg(uap, R15, regs[R15] | EN85C30); 146 write_zsreg(uap, R7, regs[R7P]); 147 148 /* make sure we use R7 "non-prime" on ESCC */ 149 write_zsreg(uap, R15, regs[R15] & ~EN85C30); 150 151 /* Synchronous mode config. */ 152 write_zsreg(uap, R6, regs[R6]); 153 write_zsreg(uap, R7, regs[R7]); 154 155 /* Disable baud generator. */ 156 write_zsreg(uap, R14, regs[R14] & ~BRENAB); 157 158 /* Clock mode control. */ 159 write_zsreg(uap, R11, regs[R11]); 160 161 /* Lower and upper byte of baud rate generator divisor. */ 162 write_zsreg(uap, R12, regs[R12]); 163 write_zsreg(uap, R13, regs[R13]); 164 165 /* Now rewrite R14, with BRENAB (if set). */ 166 write_zsreg(uap, R14, regs[R14]); 167 168 /* Reset external status interrupts. */ 169 write_zsreg(uap, R0, RES_EXT_INT); 170 write_zsreg(uap, R0, RES_EXT_INT); 171 172 /* Rewrite R3/R5, this time without enables masked. */ 173 write_zsreg(uap, R3, regs[R3]); 174 write_zsreg(uap, R5, regs[R5]); 175 176 /* Rewrite R1, this time without IRQ enabled masked. */ 177 write_zsreg(uap, R1, regs[R1]); 178 179 /* Enable interrupts */ 180 write_zsreg(uap, R9, regs[R9]); 181 } 182 183 /* 184 * We do like sunzilog to avoid disrupting pending Tx 185 * Reprogram the Zilog channel HW registers with the copies found in the 186 * software state struct. If the transmitter is busy, we defer this update 187 * until the next TX complete interrupt. Else, we do it right now. 188 * 189 * The UART port lock must be held and local interrupts disabled. 190 */ 191 static void pmz_maybe_update_regs(struct uart_pmac_port *uap) 192 { 193 if (!ZS_REGS_HELD(uap)) { 194 if (ZS_TX_ACTIVE(uap)) { 195 uap->flags |= PMACZILOG_FLAG_REGS_HELD; 196 } else { 197 pmz_debug("pmz: maybe_update_regs: updating\n"); 198 pmz_load_zsregs(uap, uap->curregs); 199 } 200 } 201 } 202 203 static void pmz_interrupt_control(struct uart_pmac_port *uap, int enable) 204 { 205 if (enable) { 206 uap->curregs[1] |= INT_ALL_Rx | TxINT_ENAB; 207 if (!ZS_IS_EXTCLK(uap)) 208 uap->curregs[1] |= EXT_INT_ENAB; 209 } else { 210 uap->curregs[1] &= ~(EXT_INT_ENAB | TxINT_ENAB | RxINT_MASK); 211 } 212 write_zsreg(uap, R1, uap->curregs[1]); 213 } 214 215 static bool pmz_receive_chars(struct uart_pmac_port *uap) 216 __must_hold(&uap->port.lock) 217 { 218 struct tty_port *port; 219 unsigned char ch, r1, drop, flag; 220 int loops = 0; 221 222 /* Sanity check, make sure the old bug is no longer happening */ 223 if (uap->port.state == NULL) { 224 WARN_ON(1); 225 (void)read_zsdata(uap); 226 return false; 227 } 228 port = &uap->port.state->port; 229 230 while (1) { 231 drop = 0; 232 233 r1 = read_zsreg(uap, R1); 234 ch = read_zsdata(uap); 235 236 if (r1 & (PAR_ERR | Rx_OVR | CRC_ERR)) { 237 write_zsreg(uap, R0, ERR_RES); 238 zssync(uap); 239 } 240 241 ch &= uap->parity_mask; 242 if (ch == 0 && uap->flags & PMACZILOG_FLAG_BREAK) { 243 uap->flags &= ~PMACZILOG_FLAG_BREAK; 244 } 245 246 #if defined(CONFIG_MAGIC_SYSRQ) && defined(CONFIG_SERIAL_CORE_CONSOLE) 247 #ifdef USE_CTRL_O_SYSRQ 248 /* Handle the SysRq ^O Hack */ 249 if (ch == '\x0f') { 250 uap->port.sysrq = jiffies + HZ*5; 251 goto next_char; 252 } 253 #endif /* USE_CTRL_O_SYSRQ */ 254 if (uap->port.sysrq) { 255 int swallow; 256 spin_unlock(&uap->port.lock); 257 swallow = uart_handle_sysrq_char(&uap->port, ch); 258 spin_lock(&uap->port.lock); 259 if (swallow) 260 goto next_char; 261 } 262 #endif /* CONFIG_MAGIC_SYSRQ && CONFIG_SERIAL_CORE_CONSOLE */ 263 264 /* A real serial line, record the character and status. */ 265 if (drop) 266 goto next_char; 267 268 flag = TTY_NORMAL; 269 uap->port.icount.rx++; 270 271 if (r1 & (PAR_ERR | Rx_OVR | CRC_ERR | BRK_ABRT)) { 272 if (r1 & BRK_ABRT) { 273 pmz_debug("pmz: got break !\n"); 274 r1 &= ~(PAR_ERR | CRC_ERR); 275 uap->port.icount.brk++; 276 if (uart_handle_break(&uap->port)) 277 goto next_char; 278 } 279 else if (r1 & PAR_ERR) 280 uap->port.icount.parity++; 281 else if (r1 & CRC_ERR) 282 uap->port.icount.frame++; 283 if (r1 & Rx_OVR) 284 uap->port.icount.overrun++; 285 r1 &= uap->port.read_status_mask; 286 if (r1 & BRK_ABRT) 287 flag = TTY_BREAK; 288 else if (r1 & PAR_ERR) 289 flag = TTY_PARITY; 290 else if (r1 & CRC_ERR) 291 flag = TTY_FRAME; 292 } 293 294 if (uap->port.ignore_status_mask == 0xff || 295 (r1 & uap->port.ignore_status_mask) == 0) { 296 tty_insert_flip_char(port, ch, flag); 297 } 298 if (r1 & Rx_OVR) 299 tty_insert_flip_char(port, 0, TTY_OVERRUN); 300 next_char: 301 /* We can get stuck in an infinite loop getting char 0 when the 302 * line is in a wrong HW state, we break that here. 303 * When that happens, I disable the receive side of the driver. 304 * Note that what I've been experiencing is a real irq loop where 305 * I'm getting flooded regardless of the actual port speed. 306 * Something strange is going on with the HW 307 */ 308 if ((++loops) > 1000) 309 goto flood; 310 ch = read_zsreg(uap, R0); 311 if (!(ch & Rx_CH_AV)) 312 break; 313 } 314 315 return true; 316 flood: 317 pmz_interrupt_control(uap, 0); 318 pmz_error("pmz: rx irq flood !\n"); 319 return true; 320 } 321 322 static void pmz_status_handle(struct uart_pmac_port *uap) 323 { 324 unsigned char status; 325 326 status = read_zsreg(uap, R0); 327 write_zsreg(uap, R0, RES_EXT_INT); 328 zssync(uap); 329 330 if (ZS_IS_OPEN(uap) && ZS_WANTS_MODEM_STATUS(uap)) { 331 if (status & SYNC_HUNT) 332 uap->port.icount.dsr++; 333 334 /* The Zilog just gives us an interrupt when DCD/CTS/etc. change. 335 * But it does not tell us which bit has changed, we have to keep 336 * track of this ourselves. 337 * The CTS input is inverted for some reason. -- paulus 338 */ 339 if ((status ^ uap->prev_status) & DCD) 340 uart_handle_dcd_change(&uap->port, 341 (status & DCD)); 342 if ((status ^ uap->prev_status) & CTS) 343 uart_handle_cts_change(&uap->port, 344 !(status & CTS)); 345 346 wake_up_interruptible(&uap->port.state->port.delta_msr_wait); 347 } 348 349 if (status & BRK_ABRT) 350 uap->flags |= PMACZILOG_FLAG_BREAK; 351 352 uap->prev_status = status; 353 } 354 355 static void pmz_transmit_chars(struct uart_pmac_port *uap) 356 { 357 struct circ_buf *xmit; 358 359 if (ZS_IS_CONS(uap)) { 360 unsigned char status = read_zsreg(uap, R0); 361 362 /* TX still busy? Just wait for the next TX done interrupt. 363 * 364 * It can occur because of how we do serial console writes. It would 365 * be nice to transmit console writes just like we normally would for 366 * a TTY line. (ie. buffered and TX interrupt driven). That is not 367 * easy because console writes cannot sleep. One solution might be 368 * to poll on enough port->xmit space becoming free. -DaveM 369 */ 370 if (!(status & Tx_BUF_EMP)) 371 return; 372 } 373 374 uap->flags &= ~PMACZILOG_FLAG_TX_ACTIVE; 375 376 if (ZS_REGS_HELD(uap)) { 377 pmz_load_zsregs(uap, uap->curregs); 378 uap->flags &= ~PMACZILOG_FLAG_REGS_HELD; 379 } 380 381 if (ZS_TX_STOPPED(uap)) { 382 uap->flags &= ~PMACZILOG_FLAG_TX_STOPPED; 383 goto ack_tx_int; 384 } 385 386 /* Under some circumstances, we see interrupts reported for 387 * a closed channel. The interrupt mask in R1 is clear, but 388 * R3 still signals the interrupts and we see them when taking 389 * an interrupt for the other channel (this could be a qemu 390 * bug but since the ESCC doc doesn't specify precsiely whether 391 * R3 interrup status bits are masked by R1 interrupt enable 392 * bits, better safe than sorry). --BenH. 393 */ 394 if (!ZS_IS_OPEN(uap)) 395 goto ack_tx_int; 396 397 if (uap->port.x_char) { 398 uap->flags |= PMACZILOG_FLAG_TX_ACTIVE; 399 write_zsdata(uap, uap->port.x_char); 400 zssync(uap); 401 uap->port.icount.tx++; 402 uap->port.x_char = 0; 403 return; 404 } 405 406 if (uap->port.state == NULL) 407 goto ack_tx_int; 408 xmit = &uap->port.state->xmit; 409 if (uart_circ_empty(xmit)) { 410 uart_write_wakeup(&uap->port); 411 goto ack_tx_int; 412 } 413 if (uart_tx_stopped(&uap->port)) 414 goto ack_tx_int; 415 416 uap->flags |= PMACZILOG_FLAG_TX_ACTIVE; 417 write_zsdata(uap, xmit->buf[xmit->tail]); 418 zssync(uap); 419 420 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); 421 uap->port.icount.tx++; 422 423 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) 424 uart_write_wakeup(&uap->port); 425 426 return; 427 428 ack_tx_int: 429 write_zsreg(uap, R0, RES_Tx_P); 430 zssync(uap); 431 } 432 433 /* Hrm... we register that twice, fixme later.... */ 434 static irqreturn_t pmz_interrupt(int irq, void *dev_id) 435 { 436 struct uart_pmac_port *uap = dev_id; 437 struct uart_pmac_port *uap_a; 438 struct uart_pmac_port *uap_b; 439 int rc = IRQ_NONE; 440 bool push; 441 u8 r3; 442 443 uap_a = pmz_get_port_A(uap); 444 uap_b = uap_a->mate; 445 446 spin_lock(&uap_a->port.lock); 447 r3 = read_zsreg(uap_a, R3); 448 449 #ifdef DEBUG_HARD 450 pmz_debug("irq, r3: %x\n", r3); 451 #endif 452 /* Channel A */ 453 push = false; 454 if (r3 & (CHAEXT | CHATxIP | CHARxIP)) { 455 if (!ZS_IS_OPEN(uap_a)) { 456 pmz_debug("ChanA interrupt while not open !\n"); 457 goto skip_a; 458 } 459 write_zsreg(uap_a, R0, RES_H_IUS); 460 zssync(uap_a); 461 if (r3 & CHAEXT) 462 pmz_status_handle(uap_a); 463 if (r3 & CHARxIP) 464 push = pmz_receive_chars(uap_a); 465 if (r3 & CHATxIP) 466 pmz_transmit_chars(uap_a); 467 rc = IRQ_HANDLED; 468 } 469 skip_a: 470 spin_unlock(&uap_a->port.lock); 471 if (push) 472 tty_flip_buffer_push(&uap->port.state->port); 473 474 if (!uap_b) 475 goto out; 476 477 spin_lock(&uap_b->port.lock); 478 push = false; 479 if (r3 & (CHBEXT | CHBTxIP | CHBRxIP)) { 480 if (!ZS_IS_OPEN(uap_b)) { 481 pmz_debug("ChanB interrupt while not open !\n"); 482 goto skip_b; 483 } 484 write_zsreg(uap_b, R0, RES_H_IUS); 485 zssync(uap_b); 486 if (r3 & CHBEXT) 487 pmz_status_handle(uap_b); 488 if (r3 & CHBRxIP) 489 push = pmz_receive_chars(uap_b); 490 if (r3 & CHBTxIP) 491 pmz_transmit_chars(uap_b); 492 rc = IRQ_HANDLED; 493 } 494 skip_b: 495 spin_unlock(&uap_b->port.lock); 496 if (push) 497 tty_flip_buffer_push(&uap->port.state->port); 498 499 out: 500 return rc; 501 } 502 503 /* 504 * Peek the status register, lock not held by caller 505 */ 506 static inline u8 pmz_peek_status(struct uart_pmac_port *uap) 507 { 508 unsigned long flags; 509 u8 status; 510 511 spin_lock_irqsave(&uap->port.lock, flags); 512 status = read_zsreg(uap, R0); 513 spin_unlock_irqrestore(&uap->port.lock, flags); 514 515 return status; 516 } 517 518 /* 519 * Check if transmitter is empty 520 * The port lock is not held. 521 */ 522 static unsigned int pmz_tx_empty(struct uart_port *port) 523 { 524 unsigned char status; 525 526 status = pmz_peek_status(to_pmz(port)); 527 if (status & Tx_BUF_EMP) 528 return TIOCSER_TEMT; 529 return 0; 530 } 531 532 /* 533 * Set Modem Control (RTS & DTR) bits 534 * The port lock is held and interrupts are disabled. 535 * Note: Shall we really filter out RTS on external ports or 536 * should that be dealt at higher level only ? 537 */ 538 static void pmz_set_mctrl(struct uart_port *port, unsigned int mctrl) 539 { 540 struct uart_pmac_port *uap = to_pmz(port); 541 unsigned char set_bits, clear_bits; 542 543 /* Do nothing for irda for now... */ 544 if (ZS_IS_IRDA(uap)) 545 return; 546 /* We get called during boot with a port not up yet */ 547 if (!(ZS_IS_OPEN(uap) || ZS_IS_CONS(uap))) 548 return; 549 550 set_bits = clear_bits = 0; 551 552 if (ZS_IS_INTMODEM(uap)) { 553 if (mctrl & TIOCM_RTS) 554 set_bits |= RTS; 555 else 556 clear_bits |= RTS; 557 } 558 if (mctrl & TIOCM_DTR) 559 set_bits |= DTR; 560 else 561 clear_bits |= DTR; 562 563 /* NOTE: Not subject to 'transmitter active' rule. */ 564 uap->curregs[R5] |= set_bits; 565 uap->curregs[R5] &= ~clear_bits; 566 567 write_zsreg(uap, R5, uap->curregs[R5]); 568 pmz_debug("pmz_set_mctrl: set bits: %x, clear bits: %x -> %x\n", 569 set_bits, clear_bits, uap->curregs[R5]); 570 zssync(uap); 571 } 572 573 /* 574 * Get Modem Control bits (only the input ones, the core will 575 * or that with a cached value of the control ones) 576 * The port lock is held and interrupts are disabled. 577 */ 578 static unsigned int pmz_get_mctrl(struct uart_port *port) 579 { 580 struct uart_pmac_port *uap = to_pmz(port); 581 unsigned char status; 582 unsigned int ret; 583 584 status = read_zsreg(uap, R0); 585 586 ret = 0; 587 if (status & DCD) 588 ret |= TIOCM_CAR; 589 if (status & SYNC_HUNT) 590 ret |= TIOCM_DSR; 591 if (!(status & CTS)) 592 ret |= TIOCM_CTS; 593 594 return ret; 595 } 596 597 /* 598 * Stop TX side. Dealt like sunzilog at next Tx interrupt, 599 * though for DMA, we will have to do a bit more. 600 * The port lock is held and interrupts are disabled. 601 */ 602 static void pmz_stop_tx(struct uart_port *port) 603 { 604 to_pmz(port)->flags |= PMACZILOG_FLAG_TX_STOPPED; 605 } 606 607 /* 608 * Kick the Tx side. 609 * The port lock is held and interrupts are disabled. 610 */ 611 static void pmz_start_tx(struct uart_port *port) 612 { 613 struct uart_pmac_port *uap = to_pmz(port); 614 unsigned char status; 615 616 pmz_debug("pmz: start_tx()\n"); 617 618 uap->flags |= PMACZILOG_FLAG_TX_ACTIVE; 619 uap->flags &= ~PMACZILOG_FLAG_TX_STOPPED; 620 621 status = read_zsreg(uap, R0); 622 623 /* TX busy? Just wait for the TX done interrupt. */ 624 if (!(status & Tx_BUF_EMP)) 625 return; 626 627 /* Send the first character to jump-start the TX done 628 * IRQ sending engine. 629 */ 630 if (port->x_char) { 631 write_zsdata(uap, port->x_char); 632 zssync(uap); 633 port->icount.tx++; 634 port->x_char = 0; 635 } else { 636 struct circ_buf *xmit = &port->state->xmit; 637 638 if (uart_circ_empty(xmit)) 639 goto out; 640 write_zsdata(uap, xmit->buf[xmit->tail]); 641 zssync(uap); 642 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); 643 port->icount.tx++; 644 645 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) 646 uart_write_wakeup(&uap->port); 647 } 648 out: 649 pmz_debug("pmz: start_tx() done.\n"); 650 } 651 652 /* 653 * Stop Rx side, basically disable emitting of 654 * Rx interrupts on the port. We don't disable the rx 655 * side of the chip proper though 656 * The port lock is held. 657 */ 658 static void pmz_stop_rx(struct uart_port *port) 659 { 660 struct uart_pmac_port *uap = to_pmz(port); 661 662 pmz_debug("pmz: stop_rx()()\n"); 663 664 /* Disable all RX interrupts. */ 665 uap->curregs[R1] &= ~RxINT_MASK; 666 pmz_maybe_update_regs(uap); 667 668 pmz_debug("pmz: stop_rx() done.\n"); 669 } 670 671 /* 672 * Enable modem status change interrupts 673 * The port lock is held. 674 */ 675 static void pmz_enable_ms(struct uart_port *port) 676 { 677 struct uart_pmac_port *uap = to_pmz(port); 678 unsigned char new_reg; 679 680 if (ZS_IS_IRDA(uap)) 681 return; 682 new_reg = uap->curregs[R15] | (DCDIE | SYNCIE | CTSIE); 683 if (new_reg != uap->curregs[R15]) { 684 uap->curregs[R15] = new_reg; 685 686 /* NOTE: Not subject to 'transmitter active' rule. */ 687 write_zsreg(uap, R15, uap->curregs[R15]); 688 } 689 } 690 691 /* 692 * Control break state emission 693 * The port lock is not held. 694 */ 695 static void pmz_break_ctl(struct uart_port *port, int break_state) 696 { 697 struct uart_pmac_port *uap = to_pmz(port); 698 unsigned char set_bits, clear_bits, new_reg; 699 unsigned long flags; 700 701 set_bits = clear_bits = 0; 702 703 if (break_state) 704 set_bits |= SND_BRK; 705 else 706 clear_bits |= SND_BRK; 707 708 spin_lock_irqsave(&port->lock, flags); 709 710 new_reg = (uap->curregs[R5] | set_bits) & ~clear_bits; 711 if (new_reg != uap->curregs[R5]) { 712 uap->curregs[R5] = new_reg; 713 write_zsreg(uap, R5, uap->curregs[R5]); 714 } 715 716 spin_unlock_irqrestore(&port->lock, flags); 717 } 718 719 #ifdef CONFIG_PPC_PMAC 720 721 /* 722 * Turn power on or off to the SCC and associated stuff 723 * (port drivers, modem, IR port, etc.) 724 * Returns the number of milliseconds we should wait before 725 * trying to use the port. 726 */ 727 static int pmz_set_scc_power(struct uart_pmac_port *uap, int state) 728 { 729 int delay = 0; 730 int rc; 731 732 if (state) { 733 rc = pmac_call_feature( 734 PMAC_FTR_SCC_ENABLE, uap->node, uap->port_type, 1); 735 pmz_debug("port power on result: %d\n", rc); 736 if (ZS_IS_INTMODEM(uap)) { 737 rc = pmac_call_feature( 738 PMAC_FTR_MODEM_ENABLE, uap->node, 0, 1); 739 delay = 2500; /* wait for 2.5s before using */ 740 pmz_debug("modem power result: %d\n", rc); 741 } 742 } else { 743 /* TODO: Make that depend on a timer, don't power down 744 * immediately 745 */ 746 if (ZS_IS_INTMODEM(uap)) { 747 rc = pmac_call_feature( 748 PMAC_FTR_MODEM_ENABLE, uap->node, 0, 0); 749 pmz_debug("port power off result: %d\n", rc); 750 } 751 pmac_call_feature(PMAC_FTR_SCC_ENABLE, uap->node, uap->port_type, 0); 752 } 753 return delay; 754 } 755 756 #else 757 758 static int pmz_set_scc_power(struct uart_pmac_port *uap, int state) 759 { 760 return 0; 761 } 762 763 #endif /* !CONFIG_PPC_PMAC */ 764 765 /* 766 * FixZeroBug....Works around a bug in the SCC receiving channel. 767 * Inspired from Darwin code, 15 Sept. 2000 -DanM 768 * 769 * The following sequence prevents a problem that is seen with O'Hare ASICs 770 * (most versions -- also with some Heathrow and Hydra ASICs) where a zero 771 * at the input to the receiver becomes 'stuck' and locks up the receiver. 772 * This problem can occur as a result of a zero bit at the receiver input 773 * coincident with any of the following events: 774 * 775 * The SCC is initialized (hardware or software). 776 * A framing error is detected. 777 * The clocking option changes from synchronous or X1 asynchronous 778 * clocking to X16, X32, or X64 asynchronous clocking. 779 * The decoding mode is changed among NRZ, NRZI, FM0, or FM1. 780 * 781 * This workaround attempts to recover from the lockup condition by placing 782 * the SCC in synchronous loopback mode with a fast clock before programming 783 * any of the asynchronous modes. 784 */ 785 static void pmz_fix_zero_bug_scc(struct uart_pmac_port *uap) 786 { 787 write_zsreg(uap, 9, ZS_IS_CHANNEL_A(uap) ? CHRA : CHRB); 788 zssync(uap); 789 udelay(10); 790 write_zsreg(uap, 9, (ZS_IS_CHANNEL_A(uap) ? CHRA : CHRB) | NV); 791 zssync(uap); 792 793 write_zsreg(uap, 4, X1CLK | MONSYNC); 794 write_zsreg(uap, 3, Rx8); 795 write_zsreg(uap, 5, Tx8 | RTS); 796 write_zsreg(uap, 9, NV); /* Didn't we already do this? */ 797 write_zsreg(uap, 11, RCBR | TCBR); 798 write_zsreg(uap, 12, 0); 799 write_zsreg(uap, 13, 0); 800 write_zsreg(uap, 14, (LOOPBAK | BRSRC)); 801 write_zsreg(uap, 14, (LOOPBAK | BRSRC | BRENAB)); 802 write_zsreg(uap, 3, Rx8 | RxENABLE); 803 write_zsreg(uap, 0, RES_EXT_INT); 804 write_zsreg(uap, 0, RES_EXT_INT); 805 write_zsreg(uap, 0, RES_EXT_INT); /* to kill some time */ 806 807 /* The channel should be OK now, but it is probably receiving 808 * loopback garbage. 809 * Switch to asynchronous mode, disable the receiver, 810 * and discard everything in the receive buffer. 811 */ 812 write_zsreg(uap, 9, NV); 813 write_zsreg(uap, 4, X16CLK | SB_MASK); 814 write_zsreg(uap, 3, Rx8); 815 816 while (read_zsreg(uap, 0) & Rx_CH_AV) { 817 (void)read_zsreg(uap, 8); 818 write_zsreg(uap, 0, RES_EXT_INT); 819 write_zsreg(uap, 0, ERR_RES); 820 } 821 } 822 823 /* 824 * Real startup routine, powers up the hardware and sets up 825 * the SCC. Returns a delay in ms where you need to wait before 826 * actually using the port, this is typically the internal modem 827 * powerup delay. This routine expect the lock to be taken. 828 */ 829 static int __pmz_startup(struct uart_pmac_port *uap) 830 { 831 int pwr_delay = 0; 832 833 memset(&uap->curregs, 0, sizeof(uap->curregs)); 834 835 /* Power up the SCC & underlying hardware (modem/irda) */ 836 pwr_delay = pmz_set_scc_power(uap, 1); 837 838 /* Nice buggy HW ... */ 839 pmz_fix_zero_bug_scc(uap); 840 841 /* Reset the channel */ 842 uap->curregs[R9] = 0; 843 write_zsreg(uap, 9, ZS_IS_CHANNEL_A(uap) ? CHRA : CHRB); 844 zssync(uap); 845 udelay(10); 846 write_zsreg(uap, 9, 0); 847 zssync(uap); 848 849 /* Clear the interrupt registers */ 850 write_zsreg(uap, R1, 0); 851 write_zsreg(uap, R0, ERR_RES); 852 write_zsreg(uap, R0, ERR_RES); 853 write_zsreg(uap, R0, RES_H_IUS); 854 write_zsreg(uap, R0, RES_H_IUS); 855 856 /* Setup some valid baud rate */ 857 uap->curregs[R4] = X16CLK | SB1; 858 uap->curregs[R3] = Rx8; 859 uap->curregs[R5] = Tx8 | RTS; 860 if (!ZS_IS_IRDA(uap)) 861 uap->curregs[R5] |= DTR; 862 uap->curregs[R12] = 0; 863 uap->curregs[R13] = 0; 864 uap->curregs[R14] = BRENAB; 865 866 /* Clear handshaking, enable BREAK interrupts */ 867 uap->curregs[R15] = BRKIE; 868 869 /* Master interrupt enable */ 870 uap->curregs[R9] |= NV | MIE; 871 872 pmz_load_zsregs(uap, uap->curregs); 873 874 /* Enable receiver and transmitter. */ 875 write_zsreg(uap, R3, uap->curregs[R3] |= RxENABLE); 876 write_zsreg(uap, R5, uap->curregs[R5] |= TxENABLE); 877 878 /* Remember status for DCD/CTS changes */ 879 uap->prev_status = read_zsreg(uap, R0); 880 881 return pwr_delay; 882 } 883 884 static void pmz_irda_reset(struct uart_pmac_port *uap) 885 { 886 unsigned long flags; 887 888 spin_lock_irqsave(&uap->port.lock, flags); 889 uap->curregs[R5] |= DTR; 890 write_zsreg(uap, R5, uap->curregs[R5]); 891 zssync(uap); 892 spin_unlock_irqrestore(&uap->port.lock, flags); 893 msleep(110); 894 895 spin_lock_irqsave(&uap->port.lock, flags); 896 uap->curregs[R5] &= ~DTR; 897 write_zsreg(uap, R5, uap->curregs[R5]); 898 zssync(uap); 899 spin_unlock_irqrestore(&uap->port.lock, flags); 900 msleep(10); 901 } 902 903 /* 904 * This is the "normal" startup routine, using the above one 905 * wrapped with the lock and doing a schedule delay 906 */ 907 static int pmz_startup(struct uart_port *port) 908 { 909 struct uart_pmac_port *uap = to_pmz(port); 910 unsigned long flags; 911 int pwr_delay = 0; 912 913 pmz_debug("pmz: startup()\n"); 914 915 uap->flags |= PMACZILOG_FLAG_IS_OPEN; 916 917 /* A console is never powered down. Else, power up and 918 * initialize the chip 919 */ 920 if (!ZS_IS_CONS(uap)) { 921 spin_lock_irqsave(&port->lock, flags); 922 pwr_delay = __pmz_startup(uap); 923 spin_unlock_irqrestore(&port->lock, flags); 924 } 925 sprintf(uap->irq_name, PMACZILOG_NAME"%d", uap->port.line); 926 if (request_irq(uap->port.irq, pmz_interrupt, IRQF_SHARED, 927 uap->irq_name, uap)) { 928 pmz_error("Unable to register zs interrupt handler.\n"); 929 pmz_set_scc_power(uap, 0); 930 return -ENXIO; 931 } 932 933 /* Right now, we deal with delay by blocking here, I'll be 934 * smarter later on 935 */ 936 if (pwr_delay != 0) { 937 pmz_debug("pmz: delaying %d ms\n", pwr_delay); 938 msleep(pwr_delay); 939 } 940 941 /* IrDA reset is done now */ 942 if (ZS_IS_IRDA(uap)) 943 pmz_irda_reset(uap); 944 945 /* Enable interrupt requests for the channel */ 946 spin_lock_irqsave(&port->lock, flags); 947 pmz_interrupt_control(uap, 1); 948 spin_unlock_irqrestore(&port->lock, flags); 949 950 pmz_debug("pmz: startup() done.\n"); 951 952 return 0; 953 } 954 955 static void pmz_shutdown(struct uart_port *port) 956 { 957 struct uart_pmac_port *uap = to_pmz(port); 958 unsigned long flags; 959 960 pmz_debug("pmz: shutdown()\n"); 961 962 spin_lock_irqsave(&port->lock, flags); 963 964 /* Disable interrupt requests for the channel */ 965 pmz_interrupt_control(uap, 0); 966 967 if (!ZS_IS_CONS(uap)) { 968 /* Disable receiver and transmitter */ 969 uap->curregs[R3] &= ~RxENABLE; 970 uap->curregs[R5] &= ~TxENABLE; 971 972 /* Disable break assertion */ 973 uap->curregs[R5] &= ~SND_BRK; 974 pmz_maybe_update_regs(uap); 975 } 976 977 spin_unlock_irqrestore(&port->lock, flags); 978 979 /* Release interrupt handler */ 980 free_irq(uap->port.irq, uap); 981 982 spin_lock_irqsave(&port->lock, flags); 983 984 uap->flags &= ~PMACZILOG_FLAG_IS_OPEN; 985 986 if (!ZS_IS_CONS(uap)) 987 pmz_set_scc_power(uap, 0); /* Shut the chip down */ 988 989 spin_unlock_irqrestore(&port->lock, flags); 990 991 pmz_debug("pmz: shutdown() done.\n"); 992 } 993 994 /* Shared by TTY driver and serial console setup. The port lock is held 995 * and local interrupts are disabled. 996 */ 997 static void pmz_convert_to_zs(struct uart_pmac_port *uap, unsigned int cflag, 998 unsigned int iflag, unsigned long baud) 999 { 1000 int brg; 1001 1002 /* Switch to external clocking for IrDA high clock rates. That 1003 * code could be re-used for Midi interfaces with different 1004 * multipliers 1005 */ 1006 if (baud >= 115200 && ZS_IS_IRDA(uap)) { 1007 uap->curregs[R4] = X1CLK; 1008 uap->curregs[R11] = RCTRxCP | TCTRxCP; 1009 uap->curregs[R14] = 0; /* BRG off */ 1010 uap->curregs[R12] = 0; 1011 uap->curregs[R13] = 0; 1012 uap->flags |= PMACZILOG_FLAG_IS_EXTCLK; 1013 } else { 1014 switch (baud) { 1015 case ZS_CLOCK/16: /* 230400 */ 1016 uap->curregs[R4] = X16CLK; 1017 uap->curregs[R11] = 0; 1018 uap->curregs[R14] = 0; 1019 break; 1020 case ZS_CLOCK/32: /* 115200 */ 1021 uap->curregs[R4] = X32CLK; 1022 uap->curregs[R11] = 0; 1023 uap->curregs[R14] = 0; 1024 break; 1025 default: 1026 uap->curregs[R4] = X16CLK; 1027 uap->curregs[R11] = TCBR | RCBR; 1028 brg = BPS_TO_BRG(baud, ZS_CLOCK / 16); 1029 uap->curregs[R12] = (brg & 255); 1030 uap->curregs[R13] = ((brg >> 8) & 255); 1031 uap->curregs[R14] = BRENAB; 1032 } 1033 uap->flags &= ~PMACZILOG_FLAG_IS_EXTCLK; 1034 } 1035 1036 /* Character size, stop bits, and parity. */ 1037 uap->curregs[3] &= ~RxN_MASK; 1038 uap->curregs[5] &= ~TxN_MASK; 1039 1040 switch (cflag & CSIZE) { 1041 case CS5: 1042 uap->curregs[3] |= Rx5; 1043 uap->curregs[5] |= Tx5; 1044 uap->parity_mask = 0x1f; 1045 break; 1046 case CS6: 1047 uap->curregs[3] |= Rx6; 1048 uap->curregs[5] |= Tx6; 1049 uap->parity_mask = 0x3f; 1050 break; 1051 case CS7: 1052 uap->curregs[3] |= Rx7; 1053 uap->curregs[5] |= Tx7; 1054 uap->parity_mask = 0x7f; 1055 break; 1056 case CS8: 1057 default: 1058 uap->curregs[3] |= Rx8; 1059 uap->curregs[5] |= Tx8; 1060 uap->parity_mask = 0xff; 1061 break; 1062 } 1063 uap->curregs[4] &= ~(SB_MASK); 1064 if (cflag & CSTOPB) 1065 uap->curregs[4] |= SB2; 1066 else 1067 uap->curregs[4] |= SB1; 1068 if (cflag & PARENB) 1069 uap->curregs[4] |= PAR_ENAB; 1070 else 1071 uap->curregs[4] &= ~PAR_ENAB; 1072 if (!(cflag & PARODD)) 1073 uap->curregs[4] |= PAR_EVEN; 1074 else 1075 uap->curregs[4] &= ~PAR_EVEN; 1076 1077 uap->port.read_status_mask = Rx_OVR; 1078 if (iflag & INPCK) 1079 uap->port.read_status_mask |= CRC_ERR | PAR_ERR; 1080 if (iflag & (IGNBRK | BRKINT | PARMRK)) 1081 uap->port.read_status_mask |= BRK_ABRT; 1082 1083 uap->port.ignore_status_mask = 0; 1084 if (iflag & IGNPAR) 1085 uap->port.ignore_status_mask |= CRC_ERR | PAR_ERR; 1086 if (iflag & IGNBRK) { 1087 uap->port.ignore_status_mask |= BRK_ABRT; 1088 if (iflag & IGNPAR) 1089 uap->port.ignore_status_mask |= Rx_OVR; 1090 } 1091 1092 if ((cflag & CREAD) == 0) 1093 uap->port.ignore_status_mask = 0xff; 1094 } 1095 1096 1097 /* 1098 * Set the irda codec on the imac to the specified baud rate. 1099 */ 1100 static void pmz_irda_setup(struct uart_pmac_port *uap, unsigned long *baud) 1101 { 1102 u8 cmdbyte; 1103 int t, version; 1104 1105 switch (*baud) { 1106 /* SIR modes */ 1107 case 2400: 1108 cmdbyte = 0x53; 1109 break; 1110 case 4800: 1111 cmdbyte = 0x52; 1112 break; 1113 case 9600: 1114 cmdbyte = 0x51; 1115 break; 1116 case 19200: 1117 cmdbyte = 0x50; 1118 break; 1119 case 38400: 1120 cmdbyte = 0x4f; 1121 break; 1122 case 57600: 1123 cmdbyte = 0x4e; 1124 break; 1125 case 115200: 1126 cmdbyte = 0x4d; 1127 break; 1128 /* The FIR modes aren't really supported at this point, how 1129 * do we select the speed ? via the FCR on KeyLargo ? 1130 */ 1131 case 1152000: 1132 cmdbyte = 0; 1133 break; 1134 case 4000000: 1135 cmdbyte = 0; 1136 break; 1137 default: /* 9600 */ 1138 cmdbyte = 0x51; 1139 *baud = 9600; 1140 break; 1141 } 1142 1143 /* Wait for transmitter to drain */ 1144 t = 10000; 1145 while ((read_zsreg(uap, R0) & Tx_BUF_EMP) == 0 1146 || (read_zsreg(uap, R1) & ALL_SNT) == 0) { 1147 if (--t <= 0) { 1148 pmz_error("transmitter didn't drain\n"); 1149 return; 1150 } 1151 udelay(10); 1152 } 1153 1154 /* Drain the receiver too */ 1155 t = 100; 1156 (void)read_zsdata(uap); 1157 (void)read_zsdata(uap); 1158 (void)read_zsdata(uap); 1159 mdelay(10); 1160 while (read_zsreg(uap, R0) & Rx_CH_AV) { 1161 read_zsdata(uap); 1162 mdelay(10); 1163 if (--t <= 0) { 1164 pmz_error("receiver didn't drain\n"); 1165 return; 1166 } 1167 } 1168 1169 /* Switch to command mode */ 1170 uap->curregs[R5] |= DTR; 1171 write_zsreg(uap, R5, uap->curregs[R5]); 1172 zssync(uap); 1173 mdelay(1); 1174 1175 /* Switch SCC to 19200 */ 1176 pmz_convert_to_zs(uap, CS8, 0, 19200); 1177 pmz_load_zsregs(uap, uap->curregs); 1178 mdelay(1); 1179 1180 /* Write get_version command byte */ 1181 write_zsdata(uap, 1); 1182 t = 5000; 1183 while ((read_zsreg(uap, R0) & Rx_CH_AV) == 0) { 1184 if (--t <= 0) { 1185 pmz_error("irda_setup timed out on get_version byte\n"); 1186 goto out; 1187 } 1188 udelay(10); 1189 } 1190 version = read_zsdata(uap); 1191 1192 if (version < 4) { 1193 pmz_info("IrDA: dongle version %d not supported\n", version); 1194 goto out; 1195 } 1196 1197 /* Send speed mode */ 1198 write_zsdata(uap, cmdbyte); 1199 t = 5000; 1200 while ((read_zsreg(uap, R0) & Rx_CH_AV) == 0) { 1201 if (--t <= 0) { 1202 pmz_error("irda_setup timed out on speed mode byte\n"); 1203 goto out; 1204 } 1205 udelay(10); 1206 } 1207 t = read_zsdata(uap); 1208 if (t != cmdbyte) 1209 pmz_error("irda_setup speed mode byte = %x (%x)\n", t, cmdbyte); 1210 1211 pmz_info("IrDA setup for %ld bps, dongle version: %d\n", 1212 *baud, version); 1213 1214 (void)read_zsdata(uap); 1215 (void)read_zsdata(uap); 1216 (void)read_zsdata(uap); 1217 1218 out: 1219 /* Switch back to data mode */ 1220 uap->curregs[R5] &= ~DTR; 1221 write_zsreg(uap, R5, uap->curregs[R5]); 1222 zssync(uap); 1223 1224 (void)read_zsdata(uap); 1225 (void)read_zsdata(uap); 1226 (void)read_zsdata(uap); 1227 } 1228 1229 1230 static void __pmz_set_termios(struct uart_port *port, struct ktermios *termios, 1231 struct ktermios *old) 1232 { 1233 struct uart_pmac_port *uap = to_pmz(port); 1234 unsigned long baud; 1235 1236 pmz_debug("pmz: set_termios()\n"); 1237 1238 memcpy(&uap->termios_cache, termios, sizeof(struct ktermios)); 1239 1240 /* XXX Check which revs of machines actually allow 1 and 4Mb speeds 1241 * on the IR dongle. Note that the IRTTY driver currently doesn't know 1242 * about the FIR mode and high speed modes. So these are unused. For 1243 * implementing proper support for these, we should probably add some 1244 * DMA as well, at least on the Rx side, which isn't a simple thing 1245 * at this point. 1246 */ 1247 if (ZS_IS_IRDA(uap)) { 1248 /* Calc baud rate */ 1249 baud = uart_get_baud_rate(port, termios, old, 1200, 4000000); 1250 pmz_debug("pmz: switch IRDA to %ld bauds\n", baud); 1251 /* Cet the irda codec to the right rate */ 1252 pmz_irda_setup(uap, &baud); 1253 /* Set final baud rate */ 1254 pmz_convert_to_zs(uap, termios->c_cflag, termios->c_iflag, baud); 1255 pmz_load_zsregs(uap, uap->curregs); 1256 zssync(uap); 1257 } else { 1258 baud = uart_get_baud_rate(port, termios, old, 1200, 230400); 1259 pmz_convert_to_zs(uap, termios->c_cflag, termios->c_iflag, baud); 1260 /* Make sure modem status interrupts are correctly configured */ 1261 if (UART_ENABLE_MS(&uap->port, termios->c_cflag)) { 1262 uap->curregs[R15] |= DCDIE | SYNCIE | CTSIE; 1263 uap->flags |= PMACZILOG_FLAG_MODEM_STATUS; 1264 } else { 1265 uap->curregs[R15] &= ~(DCDIE | SYNCIE | CTSIE); 1266 uap->flags &= ~PMACZILOG_FLAG_MODEM_STATUS; 1267 } 1268 1269 /* Load registers to the chip */ 1270 pmz_maybe_update_regs(uap); 1271 } 1272 uart_update_timeout(port, termios->c_cflag, baud); 1273 1274 pmz_debug("pmz: set_termios() done.\n"); 1275 } 1276 1277 /* The port lock is not held. */ 1278 static void pmz_set_termios(struct uart_port *port, struct ktermios *termios, 1279 struct ktermios *old) 1280 { 1281 struct uart_pmac_port *uap = to_pmz(port); 1282 unsigned long flags; 1283 1284 spin_lock_irqsave(&port->lock, flags); 1285 1286 /* Disable IRQs on the port */ 1287 pmz_interrupt_control(uap, 0); 1288 1289 /* Setup new port configuration */ 1290 __pmz_set_termios(port, termios, old); 1291 1292 /* Re-enable IRQs on the port */ 1293 if (ZS_IS_OPEN(uap)) 1294 pmz_interrupt_control(uap, 1); 1295 1296 spin_unlock_irqrestore(&port->lock, flags); 1297 } 1298 1299 static const char *pmz_type(struct uart_port *port) 1300 { 1301 struct uart_pmac_port *uap = to_pmz(port); 1302 1303 if (ZS_IS_IRDA(uap)) 1304 return "Z85c30 ESCC - Infrared port"; 1305 else if (ZS_IS_INTMODEM(uap)) 1306 return "Z85c30 ESCC - Internal modem"; 1307 return "Z85c30 ESCC - Serial port"; 1308 } 1309 1310 /* We do not request/release mappings of the registers here, this 1311 * happens at early serial probe time. 1312 */ 1313 static void pmz_release_port(struct uart_port *port) 1314 { 1315 } 1316 1317 static int pmz_request_port(struct uart_port *port) 1318 { 1319 return 0; 1320 } 1321 1322 /* These do not need to do anything interesting either. */ 1323 static void pmz_config_port(struct uart_port *port, int flags) 1324 { 1325 } 1326 1327 /* We do not support letting the user mess with the divisor, IRQ, etc. */ 1328 static int pmz_verify_port(struct uart_port *port, struct serial_struct *ser) 1329 { 1330 return -EINVAL; 1331 } 1332 1333 #ifdef CONFIG_CONSOLE_POLL 1334 1335 static int pmz_poll_get_char(struct uart_port *port) 1336 { 1337 struct uart_pmac_port *uap = 1338 container_of(port, struct uart_pmac_port, port); 1339 int tries = 2; 1340 1341 while (tries) { 1342 if ((read_zsreg(uap, R0) & Rx_CH_AV) != 0) 1343 return read_zsdata(uap); 1344 if (tries--) 1345 udelay(5); 1346 } 1347 1348 return NO_POLL_CHAR; 1349 } 1350 1351 static void pmz_poll_put_char(struct uart_port *port, unsigned char c) 1352 { 1353 struct uart_pmac_port *uap = 1354 container_of(port, struct uart_pmac_port, port); 1355 1356 /* Wait for the transmit buffer to empty. */ 1357 while ((read_zsreg(uap, R0) & Tx_BUF_EMP) == 0) 1358 udelay(5); 1359 write_zsdata(uap, c); 1360 } 1361 1362 #endif /* CONFIG_CONSOLE_POLL */ 1363 1364 static const struct uart_ops pmz_pops = { 1365 .tx_empty = pmz_tx_empty, 1366 .set_mctrl = pmz_set_mctrl, 1367 .get_mctrl = pmz_get_mctrl, 1368 .stop_tx = pmz_stop_tx, 1369 .start_tx = pmz_start_tx, 1370 .stop_rx = pmz_stop_rx, 1371 .enable_ms = pmz_enable_ms, 1372 .break_ctl = pmz_break_ctl, 1373 .startup = pmz_startup, 1374 .shutdown = pmz_shutdown, 1375 .set_termios = pmz_set_termios, 1376 .type = pmz_type, 1377 .release_port = pmz_release_port, 1378 .request_port = pmz_request_port, 1379 .config_port = pmz_config_port, 1380 .verify_port = pmz_verify_port, 1381 #ifdef CONFIG_CONSOLE_POLL 1382 .poll_get_char = pmz_poll_get_char, 1383 .poll_put_char = pmz_poll_put_char, 1384 #endif 1385 }; 1386 1387 #ifdef CONFIG_PPC_PMAC 1388 1389 /* 1390 * Setup one port structure after probing, HW is down at this point, 1391 * Unlike sunzilog, we don't need to pre-init the spinlock as we don't 1392 * register our console before uart_add_one_port() is called 1393 */ 1394 static int __init pmz_init_port(struct uart_pmac_port *uap) 1395 { 1396 struct device_node *np = uap->node; 1397 const char *conn; 1398 const struct slot_names_prop { 1399 int count; 1400 char name[1]; 1401 } *slots; 1402 int len; 1403 struct resource r_ports, r_rxdma, r_txdma; 1404 1405 /* 1406 * Request & map chip registers 1407 */ 1408 if (of_address_to_resource(np, 0, &r_ports)) 1409 return -ENODEV; 1410 uap->port.mapbase = r_ports.start; 1411 uap->port.membase = ioremap(uap->port.mapbase, 0x1000); 1412 1413 uap->control_reg = uap->port.membase; 1414 uap->data_reg = uap->control_reg + 0x10; 1415 1416 /* 1417 * Request & map DBDMA registers 1418 */ 1419 #ifdef HAS_DBDMA 1420 if (of_address_to_resource(np, 1, &r_txdma) == 0 && 1421 of_address_to_resource(np, 2, &r_rxdma) == 0) 1422 uap->flags |= PMACZILOG_FLAG_HAS_DMA; 1423 #else 1424 memset(&r_txdma, 0, sizeof(struct resource)); 1425 memset(&r_rxdma, 0, sizeof(struct resource)); 1426 #endif 1427 if (ZS_HAS_DMA(uap)) { 1428 uap->tx_dma_regs = ioremap(r_txdma.start, 0x100); 1429 if (uap->tx_dma_regs == NULL) { 1430 uap->flags &= ~PMACZILOG_FLAG_HAS_DMA; 1431 goto no_dma; 1432 } 1433 uap->rx_dma_regs = ioremap(r_rxdma.start, 0x100); 1434 if (uap->rx_dma_regs == NULL) { 1435 iounmap(uap->tx_dma_regs); 1436 uap->tx_dma_regs = NULL; 1437 uap->flags &= ~PMACZILOG_FLAG_HAS_DMA; 1438 goto no_dma; 1439 } 1440 uap->tx_dma_irq = irq_of_parse_and_map(np, 1); 1441 uap->rx_dma_irq = irq_of_parse_and_map(np, 2); 1442 } 1443 no_dma: 1444 1445 /* 1446 * Detect port type 1447 */ 1448 if (of_device_is_compatible(np, "cobalt")) 1449 uap->flags |= PMACZILOG_FLAG_IS_INTMODEM; 1450 conn = of_get_property(np, "AAPL,connector", &len); 1451 if (conn && (strcmp(conn, "infrared") == 0)) 1452 uap->flags |= PMACZILOG_FLAG_IS_IRDA; 1453 uap->port_type = PMAC_SCC_ASYNC; 1454 /* 1999 Powerbook G3 has slot-names property instead */ 1455 slots = of_get_property(np, "slot-names", &len); 1456 if (slots && slots->count > 0) { 1457 if (strcmp(slots->name, "IrDA") == 0) 1458 uap->flags |= PMACZILOG_FLAG_IS_IRDA; 1459 else if (strcmp(slots->name, "Modem") == 0) 1460 uap->flags |= PMACZILOG_FLAG_IS_INTMODEM; 1461 } 1462 if (ZS_IS_IRDA(uap)) 1463 uap->port_type = PMAC_SCC_IRDA; 1464 if (ZS_IS_INTMODEM(uap)) { 1465 struct device_node* i2c_modem = 1466 of_find_node_by_name(NULL, "i2c-modem"); 1467 if (i2c_modem) { 1468 const char* mid = 1469 of_get_property(i2c_modem, "modem-id", NULL); 1470 if (mid) switch(*mid) { 1471 case 0x04 : 1472 case 0x05 : 1473 case 0x07 : 1474 case 0x08 : 1475 case 0x0b : 1476 case 0x0c : 1477 uap->port_type = PMAC_SCC_I2S1; 1478 } 1479 printk(KERN_INFO "pmac_zilog: i2c-modem detected, id: %d\n", 1480 mid ? (*mid) : 0); 1481 of_node_put(i2c_modem); 1482 } else { 1483 printk(KERN_INFO "pmac_zilog: serial modem detected\n"); 1484 } 1485 } 1486 1487 /* 1488 * Init remaining bits of "port" structure 1489 */ 1490 uap->port.iotype = UPIO_MEM; 1491 uap->port.irq = irq_of_parse_and_map(np, 0); 1492 uap->port.uartclk = ZS_CLOCK; 1493 uap->port.fifosize = 1; 1494 uap->port.ops = &pmz_pops; 1495 uap->port.type = PORT_PMAC_ZILOG; 1496 uap->port.flags = 0; 1497 1498 /* 1499 * Fixup for the port on Gatwick for which the device-tree has 1500 * missing interrupts. Normally, the macio_dev would contain 1501 * fixed up interrupt info, but we use the device-tree directly 1502 * here due to early probing so we need the fixup too. 1503 */ 1504 if (uap->port.irq == 0 && 1505 np->parent && np->parent->parent && 1506 of_device_is_compatible(np->parent->parent, "gatwick")) { 1507 /* IRQs on gatwick are offset by 64 */ 1508 uap->port.irq = irq_create_mapping(NULL, 64 + 15); 1509 uap->tx_dma_irq = irq_create_mapping(NULL, 64 + 4); 1510 uap->rx_dma_irq = irq_create_mapping(NULL, 64 + 5); 1511 } 1512 1513 /* Setup some valid baud rate information in the register 1514 * shadows so we don't write crap there before baud rate is 1515 * first initialized. 1516 */ 1517 pmz_convert_to_zs(uap, CS8, 0, 9600); 1518 1519 return 0; 1520 } 1521 1522 /* 1523 * Get rid of a port on module removal 1524 */ 1525 static void pmz_dispose_port(struct uart_pmac_port *uap) 1526 { 1527 struct device_node *np; 1528 1529 np = uap->node; 1530 iounmap(uap->rx_dma_regs); 1531 iounmap(uap->tx_dma_regs); 1532 iounmap(uap->control_reg); 1533 uap->node = NULL; 1534 of_node_put(np); 1535 memset(uap, 0, sizeof(struct uart_pmac_port)); 1536 } 1537 1538 /* 1539 * Called upon match with an escc node in the device-tree. 1540 */ 1541 static int pmz_attach(struct macio_dev *mdev, const struct of_device_id *match) 1542 { 1543 struct uart_pmac_port *uap; 1544 int i; 1545 1546 /* Iterate the pmz_ports array to find a matching entry 1547 */ 1548 for (i = 0; i < MAX_ZS_PORTS; i++) 1549 if (pmz_ports[i].node == mdev->ofdev.dev.of_node) 1550 break; 1551 if (i >= MAX_ZS_PORTS) 1552 return -ENODEV; 1553 1554 1555 uap = &pmz_ports[i]; 1556 uap->dev = mdev; 1557 uap->port.dev = &mdev->ofdev.dev; 1558 dev_set_drvdata(&mdev->ofdev.dev, uap); 1559 1560 /* We still activate the port even when failing to request resources 1561 * to work around bugs in ancient Apple device-trees 1562 */ 1563 if (macio_request_resources(uap->dev, "pmac_zilog")) 1564 printk(KERN_WARNING "%pOFn: Failed to request resource" 1565 ", port still active\n", 1566 uap->node); 1567 else 1568 uap->flags |= PMACZILOG_FLAG_RSRC_REQUESTED; 1569 1570 return uart_add_one_port(&pmz_uart_reg, &uap->port); 1571 } 1572 1573 /* 1574 * That one should not be called, macio isn't really a hotswap device, 1575 * we don't expect one of those serial ports to go away... 1576 */ 1577 static int pmz_detach(struct macio_dev *mdev) 1578 { 1579 struct uart_pmac_port *uap = dev_get_drvdata(&mdev->ofdev.dev); 1580 1581 if (!uap) 1582 return -ENODEV; 1583 1584 uart_remove_one_port(&pmz_uart_reg, &uap->port); 1585 1586 if (uap->flags & PMACZILOG_FLAG_RSRC_REQUESTED) { 1587 macio_release_resources(uap->dev); 1588 uap->flags &= ~PMACZILOG_FLAG_RSRC_REQUESTED; 1589 } 1590 dev_set_drvdata(&mdev->ofdev.dev, NULL); 1591 uap->dev = NULL; 1592 uap->port.dev = NULL; 1593 1594 return 0; 1595 } 1596 1597 1598 static int pmz_suspend(struct macio_dev *mdev, pm_message_t pm_state) 1599 { 1600 struct uart_pmac_port *uap = dev_get_drvdata(&mdev->ofdev.dev); 1601 1602 if (uap == NULL) { 1603 printk("HRM... pmz_suspend with NULL uap\n"); 1604 return 0; 1605 } 1606 1607 uart_suspend_port(&pmz_uart_reg, &uap->port); 1608 1609 return 0; 1610 } 1611 1612 1613 static int pmz_resume(struct macio_dev *mdev) 1614 { 1615 struct uart_pmac_port *uap = dev_get_drvdata(&mdev->ofdev.dev); 1616 1617 if (uap == NULL) 1618 return 0; 1619 1620 uart_resume_port(&pmz_uart_reg, &uap->port); 1621 1622 return 0; 1623 } 1624 1625 /* 1626 * Probe all ports in the system and build the ports array, we register 1627 * with the serial layer later, so we get a proper struct device which 1628 * allows the tty to attach properly. This is later than it used to be 1629 * but the tty layer really wants it that way. 1630 */ 1631 static int __init pmz_probe(void) 1632 { 1633 struct device_node *node_p, *node_a, *node_b, *np; 1634 int count = 0; 1635 int rc; 1636 1637 /* 1638 * Find all escc chips in the system 1639 */ 1640 for_each_node_by_name(node_p, "escc") { 1641 /* 1642 * First get channel A/B node pointers 1643 * 1644 * TODO: Add routines with proper locking to do that... 1645 */ 1646 node_a = node_b = NULL; 1647 for_each_child_of_node(node_p, np) { 1648 if (of_node_name_prefix(np, "ch-a")) 1649 node_a = of_node_get(np); 1650 else if (of_node_name_prefix(np, "ch-b")) 1651 node_b = of_node_get(np); 1652 } 1653 if (!node_a && !node_b) { 1654 of_node_put(node_a); 1655 of_node_put(node_b); 1656 printk(KERN_ERR "pmac_zilog: missing node %c for escc %pOF\n", 1657 (!node_a) ? 'a' : 'b', node_p); 1658 continue; 1659 } 1660 1661 /* 1662 * Fill basic fields in the port structures 1663 */ 1664 if (node_b != NULL) { 1665 pmz_ports[count].mate = &pmz_ports[count+1]; 1666 pmz_ports[count+1].mate = &pmz_ports[count]; 1667 } 1668 pmz_ports[count].flags = PMACZILOG_FLAG_IS_CHANNEL_A; 1669 pmz_ports[count].node = node_a; 1670 pmz_ports[count+1].node = node_b; 1671 pmz_ports[count].port.line = count; 1672 pmz_ports[count+1].port.line = count+1; 1673 1674 /* 1675 * Setup the ports for real 1676 */ 1677 rc = pmz_init_port(&pmz_ports[count]); 1678 if (rc == 0 && node_b != NULL) 1679 rc = pmz_init_port(&pmz_ports[count+1]); 1680 if (rc != 0) { 1681 of_node_put(node_a); 1682 of_node_put(node_b); 1683 memset(&pmz_ports[count], 0, sizeof(struct uart_pmac_port)); 1684 memset(&pmz_ports[count+1], 0, sizeof(struct uart_pmac_port)); 1685 continue; 1686 } 1687 count += 2; 1688 } 1689 pmz_ports_count = count; 1690 1691 return 0; 1692 } 1693 1694 #else 1695 1696 /* On PCI PowerMacs, pmz_probe() does an explicit search of the OpenFirmware 1697 * tree to obtain the device_nodes needed to start the console before the 1698 * macio driver. On Macs without OpenFirmware, global platform_devices take 1699 * the place of those device_nodes. 1700 */ 1701 extern struct platform_device scc_a_pdev, scc_b_pdev; 1702 1703 static int __init pmz_init_port(struct uart_pmac_port *uap) 1704 { 1705 struct resource *r_ports; 1706 int irq; 1707 1708 r_ports = platform_get_resource(uap->pdev, IORESOURCE_MEM, 0); 1709 if (!r_ports) 1710 return -ENODEV; 1711 1712 irq = platform_get_irq(uap->pdev, 0); 1713 if (irq < 0) 1714 return irq; 1715 1716 uap->port.mapbase = r_ports->start; 1717 uap->port.membase = (unsigned char __iomem *) r_ports->start; 1718 uap->port.iotype = UPIO_MEM; 1719 uap->port.irq = irq; 1720 uap->port.uartclk = ZS_CLOCK; 1721 uap->port.fifosize = 1; 1722 uap->port.ops = &pmz_pops; 1723 uap->port.type = PORT_PMAC_ZILOG; 1724 uap->port.flags = 0; 1725 1726 uap->control_reg = uap->port.membase; 1727 uap->data_reg = uap->control_reg + 4; 1728 uap->port_type = 0; 1729 uap->port.has_sysrq = IS_ENABLED(CONFIG_SERIAL_PMACZILOG_CONSOLE); 1730 1731 pmz_convert_to_zs(uap, CS8, 0, 9600); 1732 1733 return 0; 1734 } 1735 1736 static int __init pmz_probe(void) 1737 { 1738 int err; 1739 1740 pmz_ports_count = 0; 1741 1742 pmz_ports[0].port.line = 0; 1743 pmz_ports[0].flags = PMACZILOG_FLAG_IS_CHANNEL_A; 1744 pmz_ports[0].pdev = &scc_a_pdev; 1745 err = pmz_init_port(&pmz_ports[0]); 1746 if (err) 1747 return err; 1748 pmz_ports_count++; 1749 1750 pmz_ports[0].mate = &pmz_ports[1]; 1751 pmz_ports[1].mate = &pmz_ports[0]; 1752 pmz_ports[1].port.line = 1; 1753 pmz_ports[1].flags = 0; 1754 pmz_ports[1].pdev = &scc_b_pdev; 1755 err = pmz_init_port(&pmz_ports[1]); 1756 if (err) 1757 return err; 1758 pmz_ports_count++; 1759 1760 return 0; 1761 } 1762 1763 static void pmz_dispose_port(struct uart_pmac_port *uap) 1764 { 1765 memset(uap, 0, sizeof(struct uart_pmac_port)); 1766 } 1767 1768 static int __init pmz_attach(struct platform_device *pdev) 1769 { 1770 struct uart_pmac_port *uap; 1771 int i; 1772 1773 /* Iterate the pmz_ports array to find a matching entry */ 1774 for (i = 0; i < pmz_ports_count; i++) 1775 if (pmz_ports[i].pdev == pdev) 1776 break; 1777 if (i >= pmz_ports_count) 1778 return -ENODEV; 1779 1780 uap = &pmz_ports[i]; 1781 uap->port.dev = &pdev->dev; 1782 platform_set_drvdata(pdev, uap); 1783 1784 return uart_add_one_port(&pmz_uart_reg, &uap->port); 1785 } 1786 1787 static int __exit pmz_detach(struct platform_device *pdev) 1788 { 1789 struct uart_pmac_port *uap = platform_get_drvdata(pdev); 1790 1791 if (!uap) 1792 return -ENODEV; 1793 1794 uart_remove_one_port(&pmz_uart_reg, &uap->port); 1795 1796 uap->port.dev = NULL; 1797 1798 return 0; 1799 } 1800 1801 #endif /* !CONFIG_PPC_PMAC */ 1802 1803 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE 1804 1805 static void pmz_console_write(struct console *con, const char *s, unsigned int count); 1806 static int __init pmz_console_setup(struct console *co, char *options); 1807 1808 static struct console pmz_console = { 1809 .name = PMACZILOG_NAME, 1810 .write = pmz_console_write, 1811 .device = uart_console_device, 1812 .setup = pmz_console_setup, 1813 .flags = CON_PRINTBUFFER, 1814 .index = -1, 1815 .data = &pmz_uart_reg, 1816 }; 1817 1818 #define PMACZILOG_CONSOLE &pmz_console 1819 #else /* CONFIG_SERIAL_PMACZILOG_CONSOLE */ 1820 #define PMACZILOG_CONSOLE (NULL) 1821 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */ 1822 1823 /* 1824 * Register the driver, console driver and ports with the serial 1825 * core 1826 */ 1827 static int __init pmz_register(void) 1828 { 1829 pmz_uart_reg.nr = pmz_ports_count; 1830 pmz_uart_reg.cons = PMACZILOG_CONSOLE; 1831 1832 /* 1833 * Register this driver with the serial core 1834 */ 1835 return uart_register_driver(&pmz_uart_reg); 1836 } 1837 1838 #ifdef CONFIG_PPC_PMAC 1839 1840 static const struct of_device_id pmz_match[] = 1841 { 1842 { 1843 .name = "ch-a", 1844 }, 1845 { 1846 .name = "ch-b", 1847 }, 1848 {}, 1849 }; 1850 MODULE_DEVICE_TABLE (of, pmz_match); 1851 1852 static struct macio_driver pmz_driver = { 1853 .driver = { 1854 .name = "pmac_zilog", 1855 .owner = THIS_MODULE, 1856 .of_match_table = pmz_match, 1857 }, 1858 .probe = pmz_attach, 1859 .remove = pmz_detach, 1860 .suspend = pmz_suspend, 1861 .resume = pmz_resume, 1862 }; 1863 1864 #else 1865 1866 static struct platform_driver pmz_driver = { 1867 .remove = __exit_p(pmz_detach), 1868 .driver = { 1869 .name = "scc", 1870 }, 1871 }; 1872 1873 #endif /* !CONFIG_PPC_PMAC */ 1874 1875 static int __init init_pmz(void) 1876 { 1877 int rc, i; 1878 printk(KERN_INFO "%s\n", version); 1879 1880 /* 1881 * First, we need to do a direct OF-based probe pass. We 1882 * do that because we want serial console up before the 1883 * macio stuffs calls us back, and since that makes it 1884 * easier to pass the proper number of channels to 1885 * uart_register_driver() 1886 */ 1887 if (pmz_ports_count == 0) 1888 pmz_probe(); 1889 1890 /* 1891 * Bail early if no port found 1892 */ 1893 if (pmz_ports_count == 0) 1894 return -ENODEV; 1895 1896 /* 1897 * Now we register with the serial layer 1898 */ 1899 rc = pmz_register(); 1900 if (rc) { 1901 printk(KERN_ERR 1902 "pmac_zilog: Error registering serial device, disabling pmac_zilog.\n" 1903 "pmac_zilog: Did another serial driver already claim the minors?\n"); 1904 /* effectively "pmz_unprobe()" */ 1905 for (i=0; i < pmz_ports_count; i++) 1906 pmz_dispose_port(&pmz_ports[i]); 1907 return rc; 1908 } 1909 1910 /* 1911 * Then we register the macio driver itself 1912 */ 1913 #ifdef CONFIG_PPC_PMAC 1914 return macio_register_driver(&pmz_driver); 1915 #else 1916 return platform_driver_probe(&pmz_driver, pmz_attach); 1917 #endif 1918 } 1919 1920 static void __exit exit_pmz(void) 1921 { 1922 int i; 1923 1924 #ifdef CONFIG_PPC_PMAC 1925 /* Get rid of macio-driver (detach from macio) */ 1926 macio_unregister_driver(&pmz_driver); 1927 #else 1928 platform_driver_unregister(&pmz_driver); 1929 #endif 1930 1931 for (i = 0; i < pmz_ports_count; i++) { 1932 struct uart_pmac_port *uport = &pmz_ports[i]; 1933 #ifdef CONFIG_PPC_PMAC 1934 if (uport->node != NULL) 1935 pmz_dispose_port(uport); 1936 #else 1937 if (uport->pdev != NULL) 1938 pmz_dispose_port(uport); 1939 #endif 1940 } 1941 /* Unregister UART driver */ 1942 uart_unregister_driver(&pmz_uart_reg); 1943 } 1944 1945 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE 1946 1947 static void pmz_console_putchar(struct uart_port *port, unsigned char ch) 1948 { 1949 struct uart_pmac_port *uap = 1950 container_of(port, struct uart_pmac_port, port); 1951 1952 /* Wait for the transmit buffer to empty. */ 1953 while ((read_zsreg(uap, R0) & Tx_BUF_EMP) == 0) 1954 udelay(5); 1955 write_zsdata(uap, ch); 1956 } 1957 1958 /* 1959 * Print a string to the serial port trying not to disturb 1960 * any possible real use of the port... 1961 */ 1962 static void pmz_console_write(struct console *con, const char *s, unsigned int count) 1963 { 1964 struct uart_pmac_port *uap = &pmz_ports[con->index]; 1965 unsigned long flags; 1966 1967 spin_lock_irqsave(&uap->port.lock, flags); 1968 1969 /* Turn of interrupts and enable the transmitter. */ 1970 write_zsreg(uap, R1, uap->curregs[1] & ~TxINT_ENAB); 1971 write_zsreg(uap, R5, uap->curregs[5] | TxENABLE | RTS | DTR); 1972 1973 uart_console_write(&uap->port, s, count, pmz_console_putchar); 1974 1975 /* Restore the values in the registers. */ 1976 write_zsreg(uap, R1, uap->curregs[1]); 1977 /* Don't disable the transmitter. */ 1978 1979 spin_unlock_irqrestore(&uap->port.lock, flags); 1980 } 1981 1982 /* 1983 * Setup the serial console 1984 */ 1985 static int __init pmz_console_setup(struct console *co, char *options) 1986 { 1987 struct uart_pmac_port *uap; 1988 struct uart_port *port; 1989 int baud = 38400; 1990 int bits = 8; 1991 int parity = 'n'; 1992 int flow = 'n'; 1993 unsigned long pwr_delay; 1994 1995 /* 1996 * XServe's default to 57600 bps 1997 */ 1998 if (of_machine_is_compatible("RackMac1,1") 1999 || of_machine_is_compatible("RackMac1,2") 2000 || of_machine_is_compatible("MacRISC4")) 2001 baud = 57600; 2002 2003 /* 2004 * Check whether an invalid uart number has been specified, and 2005 * if so, search for the first available port that does have 2006 * console support. 2007 */ 2008 if (co->index >= pmz_ports_count) 2009 co->index = 0; 2010 uap = &pmz_ports[co->index]; 2011 #ifdef CONFIG_PPC_PMAC 2012 if (uap->node == NULL) 2013 return -ENODEV; 2014 #else 2015 if (uap->pdev == NULL) 2016 return -ENODEV; 2017 #endif 2018 port = &uap->port; 2019 2020 /* 2021 * Mark port as beeing a console 2022 */ 2023 uap->flags |= PMACZILOG_FLAG_IS_CONS; 2024 2025 /* 2026 * Temporary fix for uart layer who didn't setup the spinlock yet 2027 */ 2028 spin_lock_init(&port->lock); 2029 2030 /* 2031 * Enable the hardware 2032 */ 2033 pwr_delay = __pmz_startup(uap); 2034 if (pwr_delay) 2035 mdelay(pwr_delay); 2036 2037 if (options) 2038 uart_parse_options(options, &baud, &parity, &bits, &flow); 2039 2040 return uart_set_options(port, co, baud, parity, bits, flow); 2041 } 2042 2043 static int __init pmz_console_init(void) 2044 { 2045 /* Probe ports */ 2046 pmz_probe(); 2047 2048 if (pmz_ports_count == 0) 2049 return -ENODEV; 2050 2051 /* TODO: Autoprobe console based on OF */ 2052 /* pmz_console.index = i; */ 2053 register_console(&pmz_console); 2054 2055 return 0; 2056 2057 } 2058 console_initcall(pmz_console_init); 2059 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */ 2060 2061 module_init(init_pmz); 2062 module_exit(exit_pmz); 2063