1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * su.c: Small serial driver for keyboard/mouse interface on sparc32/PCI 4 * 5 * Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be) 6 * Copyright (C) 1998-1999 Pete Zaitcev (zaitcev@yahoo.com) 7 * 8 * This is mainly a variation of 8250.c, credits go to authors mentioned 9 * therein. In fact this driver should be merged into the generic 8250.c 10 * infrastructure perhaps using a 8250_sparc.c module. 11 * 12 * Fixed to use tty_get_baud_rate(). 13 * Theodore Ts'o <tytso@mit.edu>, 2001-Oct-12 14 * 15 * Converted to new 2.5.x UART layer. 16 * David S. Miller (davem@davemloft.net), 2002-Jul-29 17 */ 18 19 #include <linux/module.h> 20 #include <linux/kernel.h> 21 #include <linux/spinlock.h> 22 #include <linux/errno.h> 23 #include <linux/tty.h> 24 #include <linux/tty_flip.h> 25 #include <linux/major.h> 26 #include <linux/string.h> 27 #include <linux/ptrace.h> 28 #include <linux/ioport.h> 29 #include <linux/circ_buf.h> 30 #include <linux/serial.h> 31 #include <linux/sysrq.h> 32 #include <linux/console.h> 33 #include <linux/slab.h> 34 #ifdef CONFIG_SERIO 35 #include <linux/serio.h> 36 #endif 37 #include <linux/serial_reg.h> 38 #include <linux/init.h> 39 #include <linux/delay.h> 40 #include <linux/of_device.h> 41 42 #include <linux/io.h> 43 #include <asm/irq.h> 44 #include <asm/prom.h> 45 #include <asm/setup.h> 46 47 #include <linux/serial_core.h> 48 #include <linux/sunserialcore.h> 49 50 /* We are on a NS PC87303 clocked with 24.0 MHz, which results 51 * in a UART clock of 1.8462 MHz. 52 */ 53 #define SU_BASE_BAUD (1846200 / 16) 54 55 enum su_type { SU_PORT_NONE, SU_PORT_MS, SU_PORT_KBD, SU_PORT_PORT }; 56 static char *su_typev[] = { "su(???)", "su(mouse)", "su(kbd)", "su(serial)" }; 57 58 struct serial_uart_config { 59 char *name; 60 int dfl_xmit_fifo_size; 61 int flags; 62 }; 63 64 /* 65 * Here we define the default xmit fifo size used for each type of UART. 66 */ 67 static const struct serial_uart_config uart_config[] = { 68 { "unknown", 1, 0 }, 69 { "8250", 1, 0 }, 70 { "16450", 1, 0 }, 71 { "16550", 1, 0 }, 72 { "16550A", 16, UART_CLEAR_FIFO | UART_USE_FIFO }, 73 { "Cirrus", 1, 0 }, 74 { "ST16650", 1, UART_CLEAR_FIFO | UART_STARTECH }, 75 { "ST16650V2", 32, UART_CLEAR_FIFO | UART_USE_FIFO | UART_STARTECH }, 76 { "TI16750", 64, UART_CLEAR_FIFO | UART_USE_FIFO }, 77 { "Startech", 1, 0 }, 78 { "16C950/954", 128, UART_CLEAR_FIFO | UART_USE_FIFO }, 79 { "ST16654", 64, UART_CLEAR_FIFO | UART_USE_FIFO | UART_STARTECH }, 80 { "XR16850", 128, UART_CLEAR_FIFO | UART_USE_FIFO | UART_STARTECH }, 81 { "RSA", 2048, UART_CLEAR_FIFO | UART_USE_FIFO } 82 }; 83 84 struct uart_sunsu_port { 85 struct uart_port port; 86 unsigned char acr; 87 unsigned char ier; 88 unsigned short rev; 89 unsigned char lcr; 90 unsigned int lsr_break_flag; 91 unsigned int cflag; 92 93 /* Probing information. */ 94 enum su_type su_type; 95 unsigned int type_probed; /* XXX Stupid */ 96 unsigned long reg_size; 97 98 #ifdef CONFIG_SERIO 99 struct serio serio; 100 int serio_open; 101 #endif 102 }; 103 104 static unsigned int serial_in(struct uart_sunsu_port *up, int offset) 105 { 106 offset <<= up->port.regshift; 107 108 switch (up->port.iotype) { 109 case UPIO_HUB6: 110 outb(up->port.hub6 - 1 + offset, up->port.iobase); 111 return inb(up->port.iobase + 1); 112 113 case UPIO_MEM: 114 return readb(up->port.membase + offset); 115 116 default: 117 return inb(up->port.iobase + offset); 118 } 119 } 120 121 static void serial_out(struct uart_sunsu_port *up, int offset, int value) 122 { 123 #ifndef CONFIG_SPARC64 124 /* 125 * MrCoffee has weird schematics: IRQ4 & P10(?) pins of SuperIO are 126 * connected with a gate then go to SlavIO. When IRQ4 goes tristated 127 * gate outputs a logical one. Since we use level triggered interrupts 128 * we have lockup and watchdog reset. We cannot mask IRQ because 129 * keyboard shares IRQ with us (Word has it as Bob Smelik's design). 130 * This problem is similar to what Alpha people suffer, see 131 * 8250_alpha.c. 132 */ 133 if (offset == UART_MCR) 134 value |= UART_MCR_OUT2; 135 #endif 136 offset <<= up->port.regshift; 137 138 switch (up->port.iotype) { 139 case UPIO_HUB6: 140 outb(up->port.hub6 - 1 + offset, up->port.iobase); 141 outb(value, up->port.iobase + 1); 142 break; 143 144 case UPIO_MEM: 145 writeb(value, up->port.membase + offset); 146 break; 147 148 default: 149 outb(value, up->port.iobase + offset); 150 } 151 } 152 153 /* 154 * We used to support using pause I/O for certain machines. We 155 * haven't supported this for a while, but just in case it's badly 156 * needed for certain old 386 machines, I've left these #define's 157 * in.... 158 */ 159 #define serial_inp(up, offset) serial_in(up, offset) 160 #define serial_outp(up, offset, value) serial_out(up, offset, value) 161 162 163 /* 164 * For the 16C950 165 */ 166 static void serial_icr_write(struct uart_sunsu_port *up, int offset, int value) 167 { 168 serial_out(up, UART_SCR, offset); 169 serial_out(up, UART_ICR, value); 170 } 171 172 #if 0 /* Unused currently */ 173 static unsigned int serial_icr_read(struct uart_sunsu_port *up, int offset) 174 { 175 unsigned int value; 176 177 serial_icr_write(up, UART_ACR, up->acr | UART_ACR_ICRRD); 178 serial_out(up, UART_SCR, offset); 179 value = serial_in(up, UART_ICR); 180 serial_icr_write(up, UART_ACR, up->acr); 181 182 return value; 183 } 184 #endif 185 186 #ifdef CONFIG_SERIAL_8250_RSA 187 /* 188 * Attempts to turn on the RSA FIFO. Returns zero on failure. 189 * We set the port uart clock rate if we succeed. 190 */ 191 static int __enable_rsa(struct uart_sunsu_port *up) 192 { 193 unsigned char mode; 194 int result; 195 196 mode = serial_inp(up, UART_RSA_MSR); 197 result = mode & UART_RSA_MSR_FIFO; 198 199 if (!result) { 200 serial_outp(up, UART_RSA_MSR, mode | UART_RSA_MSR_FIFO); 201 mode = serial_inp(up, UART_RSA_MSR); 202 result = mode & UART_RSA_MSR_FIFO; 203 } 204 205 if (result) 206 up->port.uartclk = SERIAL_RSA_BAUD_BASE * 16; 207 208 return result; 209 } 210 211 static void enable_rsa(struct uart_sunsu_port *up) 212 { 213 if (up->port.type == PORT_RSA) { 214 if (up->port.uartclk != SERIAL_RSA_BAUD_BASE * 16) { 215 spin_lock_irq(&up->port.lock); 216 __enable_rsa(up); 217 spin_unlock_irq(&up->port.lock); 218 } 219 if (up->port.uartclk == SERIAL_RSA_BAUD_BASE * 16) 220 serial_outp(up, UART_RSA_FRR, 0); 221 } 222 } 223 224 /* 225 * Attempts to turn off the RSA FIFO. Returns zero on failure. 226 * It is unknown why interrupts were disabled in here. However, 227 * the caller is expected to preserve this behaviour by grabbing 228 * the spinlock before calling this function. 229 */ 230 static void disable_rsa(struct uart_sunsu_port *up) 231 { 232 unsigned char mode; 233 int result; 234 235 if (up->port.type == PORT_RSA && 236 up->port.uartclk == SERIAL_RSA_BAUD_BASE * 16) { 237 spin_lock_irq(&up->port.lock); 238 239 mode = serial_inp(up, UART_RSA_MSR); 240 result = !(mode & UART_RSA_MSR_FIFO); 241 242 if (!result) { 243 serial_outp(up, UART_RSA_MSR, mode & ~UART_RSA_MSR_FIFO); 244 mode = serial_inp(up, UART_RSA_MSR); 245 result = !(mode & UART_RSA_MSR_FIFO); 246 } 247 248 if (result) 249 up->port.uartclk = SERIAL_RSA_BAUD_BASE_LO * 16; 250 spin_unlock_irq(&up->port.lock); 251 } 252 } 253 #endif /* CONFIG_SERIAL_8250_RSA */ 254 255 static inline void __stop_tx(struct uart_sunsu_port *p) 256 { 257 if (p->ier & UART_IER_THRI) { 258 p->ier &= ~UART_IER_THRI; 259 serial_out(p, UART_IER, p->ier); 260 } 261 } 262 263 static void sunsu_stop_tx(struct uart_port *port) 264 { 265 struct uart_sunsu_port *up = 266 container_of(port, struct uart_sunsu_port, port); 267 268 __stop_tx(up); 269 270 /* 271 * We really want to stop the transmitter from sending. 272 */ 273 if (up->port.type == PORT_16C950) { 274 up->acr |= UART_ACR_TXDIS; 275 serial_icr_write(up, UART_ACR, up->acr); 276 } 277 } 278 279 static void sunsu_start_tx(struct uart_port *port) 280 { 281 struct uart_sunsu_port *up = 282 container_of(port, struct uart_sunsu_port, port); 283 284 if (!(up->ier & UART_IER_THRI)) { 285 up->ier |= UART_IER_THRI; 286 serial_out(up, UART_IER, up->ier); 287 } 288 289 /* 290 * Re-enable the transmitter if we disabled it. 291 */ 292 if (up->port.type == PORT_16C950 && up->acr & UART_ACR_TXDIS) { 293 up->acr &= ~UART_ACR_TXDIS; 294 serial_icr_write(up, UART_ACR, up->acr); 295 } 296 } 297 298 static void sunsu_stop_rx(struct uart_port *port) 299 { 300 struct uart_sunsu_port *up = 301 container_of(port, struct uart_sunsu_port, port); 302 303 up->ier &= ~UART_IER_RLSI; 304 up->port.read_status_mask &= ~UART_LSR_DR; 305 serial_out(up, UART_IER, up->ier); 306 } 307 308 static void sunsu_enable_ms(struct uart_port *port) 309 { 310 struct uart_sunsu_port *up = 311 container_of(port, struct uart_sunsu_port, port); 312 unsigned long flags; 313 314 spin_lock_irqsave(&up->port.lock, flags); 315 up->ier |= UART_IER_MSI; 316 serial_out(up, UART_IER, up->ier); 317 spin_unlock_irqrestore(&up->port.lock, flags); 318 } 319 320 static void 321 receive_chars(struct uart_sunsu_port *up, unsigned char *status) 322 { 323 struct tty_port *port = &up->port.state->port; 324 unsigned char ch, flag; 325 int max_count = 256; 326 int saw_console_brk = 0; 327 328 do { 329 ch = serial_inp(up, UART_RX); 330 flag = TTY_NORMAL; 331 up->port.icount.rx++; 332 333 if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE | 334 UART_LSR_FE | UART_LSR_OE))) { 335 /* 336 * For statistics only 337 */ 338 if (*status & UART_LSR_BI) { 339 *status &= ~(UART_LSR_FE | UART_LSR_PE); 340 up->port.icount.brk++; 341 if (up->port.cons != NULL && 342 up->port.line == up->port.cons->index) 343 saw_console_brk = 1; 344 /* 345 * We do the SysRQ and SAK checking 346 * here because otherwise the break 347 * may get masked by ignore_status_mask 348 * or read_status_mask. 349 */ 350 if (uart_handle_break(&up->port)) 351 goto ignore_char; 352 } else if (*status & UART_LSR_PE) 353 up->port.icount.parity++; 354 else if (*status & UART_LSR_FE) 355 up->port.icount.frame++; 356 if (*status & UART_LSR_OE) 357 up->port.icount.overrun++; 358 359 /* 360 * Mask off conditions which should be ingored. 361 */ 362 *status &= up->port.read_status_mask; 363 364 if (up->port.cons != NULL && 365 up->port.line == up->port.cons->index) { 366 /* Recover the break flag from console xmit */ 367 *status |= up->lsr_break_flag; 368 up->lsr_break_flag = 0; 369 } 370 371 if (*status & UART_LSR_BI) { 372 flag = TTY_BREAK; 373 } else if (*status & UART_LSR_PE) 374 flag = TTY_PARITY; 375 else if (*status & UART_LSR_FE) 376 flag = TTY_FRAME; 377 } 378 if (uart_handle_sysrq_char(&up->port, ch)) 379 goto ignore_char; 380 if ((*status & up->port.ignore_status_mask) == 0) 381 tty_insert_flip_char(port, ch, flag); 382 if (*status & UART_LSR_OE) 383 /* 384 * Overrun is special, since it's reported 385 * immediately, and doesn't affect the current 386 * character. 387 */ 388 tty_insert_flip_char(port, 0, TTY_OVERRUN); 389 ignore_char: 390 *status = serial_inp(up, UART_LSR); 391 } while ((*status & UART_LSR_DR) && (max_count-- > 0)); 392 393 if (saw_console_brk) 394 sun_do_break(); 395 } 396 397 static void transmit_chars(struct uart_sunsu_port *up) 398 { 399 struct circ_buf *xmit = &up->port.state->xmit; 400 int count; 401 402 if (up->port.x_char) { 403 serial_outp(up, UART_TX, up->port.x_char); 404 up->port.icount.tx++; 405 up->port.x_char = 0; 406 return; 407 } 408 if (uart_tx_stopped(&up->port)) { 409 sunsu_stop_tx(&up->port); 410 return; 411 } 412 if (uart_circ_empty(xmit)) { 413 __stop_tx(up); 414 return; 415 } 416 417 count = up->port.fifosize; 418 do { 419 serial_out(up, UART_TX, xmit->buf[xmit->tail]); 420 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); 421 up->port.icount.tx++; 422 if (uart_circ_empty(xmit)) 423 break; 424 } while (--count > 0); 425 426 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) 427 uart_write_wakeup(&up->port); 428 429 if (uart_circ_empty(xmit)) 430 __stop_tx(up); 431 } 432 433 static void check_modem_status(struct uart_sunsu_port *up) 434 { 435 int status; 436 437 status = serial_in(up, UART_MSR); 438 439 if ((status & UART_MSR_ANY_DELTA) == 0) 440 return; 441 442 if (status & UART_MSR_TERI) 443 up->port.icount.rng++; 444 if (status & UART_MSR_DDSR) 445 up->port.icount.dsr++; 446 if (status & UART_MSR_DDCD) 447 uart_handle_dcd_change(&up->port, status & UART_MSR_DCD); 448 if (status & UART_MSR_DCTS) 449 uart_handle_cts_change(&up->port, status & UART_MSR_CTS); 450 451 wake_up_interruptible(&up->port.state->port.delta_msr_wait); 452 } 453 454 static irqreturn_t sunsu_serial_interrupt(int irq, void *dev_id) 455 { 456 struct uart_sunsu_port *up = dev_id; 457 unsigned long flags; 458 unsigned char status; 459 460 spin_lock_irqsave(&up->port.lock, flags); 461 462 do { 463 status = serial_inp(up, UART_LSR); 464 if (status & UART_LSR_DR) 465 receive_chars(up, &status); 466 check_modem_status(up); 467 if (status & UART_LSR_THRE) 468 transmit_chars(up); 469 470 tty_flip_buffer_push(&up->port.state->port); 471 472 } while (!(serial_in(up, UART_IIR) & UART_IIR_NO_INT)); 473 474 spin_unlock_irqrestore(&up->port.lock, flags); 475 476 return IRQ_HANDLED; 477 } 478 479 /* Separate interrupt handling path for keyboard/mouse ports. */ 480 481 static void 482 sunsu_change_speed(struct uart_port *port, unsigned int cflag, 483 unsigned int iflag, unsigned int quot); 484 485 static void sunsu_change_mouse_baud(struct uart_sunsu_port *up) 486 { 487 unsigned int cur_cflag = up->cflag; 488 int quot, new_baud; 489 490 up->cflag &= ~CBAUD; 491 up->cflag |= suncore_mouse_baud_cflag_next(cur_cflag, &new_baud); 492 493 quot = up->port.uartclk / (16 * new_baud); 494 495 sunsu_change_speed(&up->port, up->cflag, 0, quot); 496 } 497 498 static void receive_kbd_ms_chars(struct uart_sunsu_port *up, int is_break) 499 { 500 do { 501 unsigned char ch = serial_inp(up, UART_RX); 502 503 /* Stop-A is handled by drivers/char/keyboard.c now. */ 504 if (up->su_type == SU_PORT_KBD) { 505 #ifdef CONFIG_SERIO 506 serio_interrupt(&up->serio, ch, 0); 507 #endif 508 } else if (up->su_type == SU_PORT_MS) { 509 int ret = suncore_mouse_baud_detection(ch, is_break); 510 511 switch (ret) { 512 case 2: 513 sunsu_change_mouse_baud(up); 514 fallthrough; 515 case 1: 516 break; 517 518 case 0: 519 #ifdef CONFIG_SERIO 520 serio_interrupt(&up->serio, ch, 0); 521 #endif 522 break; 523 } 524 } 525 } while (serial_in(up, UART_LSR) & UART_LSR_DR); 526 } 527 528 static irqreturn_t sunsu_kbd_ms_interrupt(int irq, void *dev_id) 529 { 530 struct uart_sunsu_port *up = dev_id; 531 532 if (!(serial_in(up, UART_IIR) & UART_IIR_NO_INT)) { 533 unsigned char status = serial_inp(up, UART_LSR); 534 535 if ((status & UART_LSR_DR) || (status & UART_LSR_BI)) 536 receive_kbd_ms_chars(up, (status & UART_LSR_BI) != 0); 537 } 538 539 return IRQ_HANDLED; 540 } 541 542 static unsigned int sunsu_tx_empty(struct uart_port *port) 543 { 544 struct uart_sunsu_port *up = 545 container_of(port, struct uart_sunsu_port, port); 546 unsigned long flags; 547 unsigned int ret; 548 549 spin_lock_irqsave(&up->port.lock, flags); 550 ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0; 551 spin_unlock_irqrestore(&up->port.lock, flags); 552 553 return ret; 554 } 555 556 static unsigned int sunsu_get_mctrl(struct uart_port *port) 557 { 558 struct uart_sunsu_port *up = 559 container_of(port, struct uart_sunsu_port, port); 560 unsigned char status; 561 unsigned int ret; 562 563 status = serial_in(up, UART_MSR); 564 565 ret = 0; 566 if (status & UART_MSR_DCD) 567 ret |= TIOCM_CAR; 568 if (status & UART_MSR_RI) 569 ret |= TIOCM_RNG; 570 if (status & UART_MSR_DSR) 571 ret |= TIOCM_DSR; 572 if (status & UART_MSR_CTS) 573 ret |= TIOCM_CTS; 574 return ret; 575 } 576 577 static void sunsu_set_mctrl(struct uart_port *port, unsigned int mctrl) 578 { 579 struct uart_sunsu_port *up = 580 container_of(port, struct uart_sunsu_port, port); 581 unsigned char mcr = 0; 582 583 if (mctrl & TIOCM_RTS) 584 mcr |= UART_MCR_RTS; 585 if (mctrl & TIOCM_DTR) 586 mcr |= UART_MCR_DTR; 587 if (mctrl & TIOCM_OUT1) 588 mcr |= UART_MCR_OUT1; 589 if (mctrl & TIOCM_OUT2) 590 mcr |= UART_MCR_OUT2; 591 if (mctrl & TIOCM_LOOP) 592 mcr |= UART_MCR_LOOP; 593 594 serial_out(up, UART_MCR, mcr); 595 } 596 597 static void sunsu_break_ctl(struct uart_port *port, int break_state) 598 { 599 struct uart_sunsu_port *up = 600 container_of(port, struct uart_sunsu_port, port); 601 unsigned long flags; 602 603 spin_lock_irqsave(&up->port.lock, flags); 604 if (break_state == -1) 605 up->lcr |= UART_LCR_SBC; 606 else 607 up->lcr &= ~UART_LCR_SBC; 608 serial_out(up, UART_LCR, up->lcr); 609 spin_unlock_irqrestore(&up->port.lock, flags); 610 } 611 612 static int sunsu_startup(struct uart_port *port) 613 { 614 struct uart_sunsu_port *up = 615 container_of(port, struct uart_sunsu_port, port); 616 unsigned long flags; 617 int retval; 618 619 if (up->port.type == PORT_16C950) { 620 /* Wake up and initialize UART */ 621 up->acr = 0; 622 serial_outp(up, UART_LCR, 0xBF); 623 serial_outp(up, UART_EFR, UART_EFR_ECB); 624 serial_outp(up, UART_IER, 0); 625 serial_outp(up, UART_LCR, 0); 626 serial_icr_write(up, UART_CSR, 0); /* Reset the UART */ 627 serial_outp(up, UART_LCR, 0xBF); 628 serial_outp(up, UART_EFR, UART_EFR_ECB); 629 serial_outp(up, UART_LCR, 0); 630 } 631 632 #ifdef CONFIG_SERIAL_8250_RSA 633 /* 634 * If this is an RSA port, see if we can kick it up to the 635 * higher speed clock. 636 */ 637 enable_rsa(up); 638 #endif 639 640 /* 641 * Clear the FIFO buffers and disable them. 642 * (they will be reenabled in set_termios()) 643 */ 644 if (uart_config[up->port.type].flags & UART_CLEAR_FIFO) { 645 serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO); 646 serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO | 647 UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT); 648 serial_outp(up, UART_FCR, 0); 649 } 650 651 /* 652 * Clear the interrupt registers. 653 */ 654 (void) serial_inp(up, UART_LSR); 655 (void) serial_inp(up, UART_RX); 656 (void) serial_inp(up, UART_IIR); 657 (void) serial_inp(up, UART_MSR); 658 659 /* 660 * At this point, there's no way the LSR could still be 0xff; 661 * if it is, then bail out, because there's likely no UART 662 * here. 663 */ 664 if (!(up->port.flags & UPF_BUGGY_UART) && 665 (serial_inp(up, UART_LSR) == 0xff)) { 666 printk("ttyS%d: LSR safety check engaged!\n", up->port.line); 667 return -ENODEV; 668 } 669 670 if (up->su_type != SU_PORT_PORT) { 671 retval = request_irq(up->port.irq, sunsu_kbd_ms_interrupt, 672 IRQF_SHARED, su_typev[up->su_type], up); 673 } else { 674 retval = request_irq(up->port.irq, sunsu_serial_interrupt, 675 IRQF_SHARED, su_typev[up->su_type], up); 676 } 677 if (retval) { 678 printk("su: Cannot register IRQ %d\n", up->port.irq); 679 return retval; 680 } 681 682 /* 683 * Now, initialize the UART 684 */ 685 serial_outp(up, UART_LCR, UART_LCR_WLEN8); 686 687 spin_lock_irqsave(&up->port.lock, flags); 688 689 up->port.mctrl |= TIOCM_OUT2; 690 691 sunsu_set_mctrl(&up->port, up->port.mctrl); 692 spin_unlock_irqrestore(&up->port.lock, flags); 693 694 /* 695 * Finally, enable interrupts. Note: Modem status interrupts 696 * are set via set_termios(), which will be occurring imminently 697 * anyway, so we don't enable them here. 698 */ 699 up->ier = UART_IER_RLSI | UART_IER_RDI; 700 serial_outp(up, UART_IER, up->ier); 701 702 if (up->port.flags & UPF_FOURPORT) { 703 unsigned int icp; 704 /* 705 * Enable interrupts on the AST Fourport board 706 */ 707 icp = (up->port.iobase & 0xfe0) | 0x01f; 708 outb_p(0x80, icp); 709 (void) inb_p(icp); 710 } 711 712 /* 713 * And clear the interrupt registers again for luck. 714 */ 715 (void) serial_inp(up, UART_LSR); 716 (void) serial_inp(up, UART_RX); 717 (void) serial_inp(up, UART_IIR); 718 (void) serial_inp(up, UART_MSR); 719 720 return 0; 721 } 722 723 static void sunsu_shutdown(struct uart_port *port) 724 { 725 struct uart_sunsu_port *up = 726 container_of(port, struct uart_sunsu_port, port); 727 unsigned long flags; 728 729 /* 730 * Disable interrupts from this port 731 */ 732 up->ier = 0; 733 serial_outp(up, UART_IER, 0); 734 735 spin_lock_irqsave(&up->port.lock, flags); 736 if (up->port.flags & UPF_FOURPORT) { 737 /* reset interrupts on the AST Fourport board */ 738 inb((up->port.iobase & 0xfe0) | 0x1f); 739 up->port.mctrl |= TIOCM_OUT1; 740 } else 741 up->port.mctrl &= ~TIOCM_OUT2; 742 743 sunsu_set_mctrl(&up->port, up->port.mctrl); 744 spin_unlock_irqrestore(&up->port.lock, flags); 745 746 /* 747 * Disable break condition and FIFOs 748 */ 749 serial_out(up, UART_LCR, serial_inp(up, UART_LCR) & ~UART_LCR_SBC); 750 serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO | 751 UART_FCR_CLEAR_RCVR | 752 UART_FCR_CLEAR_XMIT); 753 serial_outp(up, UART_FCR, 0); 754 755 #ifdef CONFIG_SERIAL_8250_RSA 756 /* 757 * Reset the RSA board back to 115kbps compat mode. 758 */ 759 disable_rsa(up); 760 #endif 761 762 /* 763 * Read data port to reset things. 764 */ 765 (void) serial_in(up, UART_RX); 766 767 free_irq(up->port.irq, up); 768 } 769 770 static void 771 sunsu_change_speed(struct uart_port *port, unsigned int cflag, 772 unsigned int iflag, unsigned int quot) 773 { 774 struct uart_sunsu_port *up = 775 container_of(port, struct uart_sunsu_port, port); 776 unsigned char cval, fcr = 0; 777 unsigned long flags; 778 779 switch (cflag & CSIZE) { 780 case CS5: 781 cval = 0x00; 782 break; 783 case CS6: 784 cval = 0x01; 785 break; 786 case CS7: 787 cval = 0x02; 788 break; 789 default: 790 case CS8: 791 cval = 0x03; 792 break; 793 } 794 795 if (cflag & CSTOPB) 796 cval |= 0x04; 797 if (cflag & PARENB) 798 cval |= UART_LCR_PARITY; 799 if (!(cflag & PARODD)) 800 cval |= UART_LCR_EPAR; 801 if (cflag & CMSPAR) 802 cval |= UART_LCR_SPAR; 803 804 /* 805 * Work around a bug in the Oxford Semiconductor 952 rev B 806 * chip which causes it to seriously miscalculate baud rates 807 * when DLL is 0. 808 */ 809 if ((quot & 0xff) == 0 && up->port.type == PORT_16C950 && 810 up->rev == 0x5201) 811 quot ++; 812 813 if (uart_config[up->port.type].flags & UART_USE_FIFO) { 814 if ((up->port.uartclk / quot) < (2400 * 16)) 815 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_1; 816 #ifdef CONFIG_SERIAL_8250_RSA 817 else if (up->port.type == PORT_RSA) 818 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_14; 819 #endif 820 else 821 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_8; 822 } 823 if (up->port.type == PORT_16750) 824 fcr |= UART_FCR7_64BYTE; 825 826 /* 827 * Ok, we're now changing the port state. Do it with 828 * interrupts disabled. 829 */ 830 spin_lock_irqsave(&up->port.lock, flags); 831 832 /* 833 * Update the per-port timeout. 834 */ 835 uart_update_timeout(port, cflag, (port->uartclk / (16 * quot))); 836 837 up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR; 838 if (iflag & INPCK) 839 up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE; 840 if (iflag & (IGNBRK | BRKINT | PARMRK)) 841 up->port.read_status_mask |= UART_LSR_BI; 842 843 /* 844 * Characteres to ignore 845 */ 846 up->port.ignore_status_mask = 0; 847 if (iflag & IGNPAR) 848 up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; 849 if (iflag & IGNBRK) { 850 up->port.ignore_status_mask |= UART_LSR_BI; 851 /* 852 * If we're ignoring parity and break indicators, 853 * ignore overruns too (for real raw support). 854 */ 855 if (iflag & IGNPAR) 856 up->port.ignore_status_mask |= UART_LSR_OE; 857 } 858 859 /* 860 * ignore all characters if CREAD is not set 861 */ 862 if ((cflag & CREAD) == 0) 863 up->port.ignore_status_mask |= UART_LSR_DR; 864 865 /* 866 * CTS flow control flag and modem status interrupts 867 */ 868 up->ier &= ~UART_IER_MSI; 869 if (UART_ENABLE_MS(&up->port, cflag)) 870 up->ier |= UART_IER_MSI; 871 872 serial_out(up, UART_IER, up->ier); 873 874 if (uart_config[up->port.type].flags & UART_STARTECH) { 875 serial_outp(up, UART_LCR, 0xBF); 876 serial_outp(up, UART_EFR, cflag & CRTSCTS ? UART_EFR_CTS :0); 877 } 878 serial_outp(up, UART_LCR, cval | UART_LCR_DLAB);/* set DLAB */ 879 serial_outp(up, UART_DLL, quot & 0xff); /* LS of divisor */ 880 serial_outp(up, UART_DLM, quot >> 8); /* MS of divisor */ 881 if (up->port.type == PORT_16750) 882 serial_outp(up, UART_FCR, fcr); /* set fcr */ 883 serial_outp(up, UART_LCR, cval); /* reset DLAB */ 884 up->lcr = cval; /* Save LCR */ 885 if (up->port.type != PORT_16750) { 886 if (fcr & UART_FCR_ENABLE_FIFO) { 887 /* emulated UARTs (Lucent Venus 167x) need two steps */ 888 serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO); 889 } 890 serial_outp(up, UART_FCR, fcr); /* set fcr */ 891 } 892 893 up->cflag = cflag; 894 895 spin_unlock_irqrestore(&up->port.lock, flags); 896 } 897 898 static void 899 sunsu_set_termios(struct uart_port *port, struct ktermios *termios, 900 struct ktermios *old) 901 { 902 unsigned int baud, quot; 903 904 /* 905 * Ask the core to calculate the divisor for us. 906 */ 907 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); 908 quot = uart_get_divisor(port, baud); 909 910 sunsu_change_speed(port, termios->c_cflag, termios->c_iflag, quot); 911 } 912 913 static void sunsu_release_port(struct uart_port *port) 914 { 915 } 916 917 static int sunsu_request_port(struct uart_port *port) 918 { 919 return 0; 920 } 921 922 static void sunsu_config_port(struct uart_port *port, int flags) 923 { 924 struct uart_sunsu_port *up = 925 container_of(port, struct uart_sunsu_port, port); 926 927 if (flags & UART_CONFIG_TYPE) { 928 /* 929 * We are supposed to call autoconfig here, but this requires 930 * splitting all the OBP probing crap from the UART probing. 931 * We'll do it when we kill sunsu.c altogether. 932 */ 933 port->type = up->type_probed; /* XXX */ 934 } 935 } 936 937 static int 938 sunsu_verify_port(struct uart_port *port, struct serial_struct *ser) 939 { 940 return -EINVAL; 941 } 942 943 static const char * 944 sunsu_type(struct uart_port *port) 945 { 946 int type = port->type; 947 948 if (type >= ARRAY_SIZE(uart_config)) 949 type = 0; 950 return uart_config[type].name; 951 } 952 953 static const struct uart_ops sunsu_pops = { 954 .tx_empty = sunsu_tx_empty, 955 .set_mctrl = sunsu_set_mctrl, 956 .get_mctrl = sunsu_get_mctrl, 957 .stop_tx = sunsu_stop_tx, 958 .start_tx = sunsu_start_tx, 959 .stop_rx = sunsu_stop_rx, 960 .enable_ms = sunsu_enable_ms, 961 .break_ctl = sunsu_break_ctl, 962 .startup = sunsu_startup, 963 .shutdown = sunsu_shutdown, 964 .set_termios = sunsu_set_termios, 965 .type = sunsu_type, 966 .release_port = sunsu_release_port, 967 .request_port = sunsu_request_port, 968 .config_port = sunsu_config_port, 969 .verify_port = sunsu_verify_port, 970 }; 971 972 #define UART_NR 4 973 974 static struct uart_sunsu_port sunsu_ports[UART_NR]; 975 static int nr_inst; /* Number of already registered ports */ 976 977 #ifdef CONFIG_SERIO 978 979 static DEFINE_SPINLOCK(sunsu_serio_lock); 980 981 static int sunsu_serio_write(struct serio *serio, unsigned char ch) 982 { 983 struct uart_sunsu_port *up = serio->port_data; 984 unsigned long flags; 985 int lsr; 986 987 spin_lock_irqsave(&sunsu_serio_lock, flags); 988 989 do { 990 lsr = serial_in(up, UART_LSR); 991 } while (!(lsr & UART_LSR_THRE)); 992 993 /* Send the character out. */ 994 serial_out(up, UART_TX, ch); 995 996 spin_unlock_irqrestore(&sunsu_serio_lock, flags); 997 998 return 0; 999 } 1000 1001 static int sunsu_serio_open(struct serio *serio) 1002 { 1003 struct uart_sunsu_port *up = serio->port_data; 1004 unsigned long flags; 1005 int ret; 1006 1007 spin_lock_irqsave(&sunsu_serio_lock, flags); 1008 if (!up->serio_open) { 1009 up->serio_open = 1; 1010 ret = 0; 1011 } else 1012 ret = -EBUSY; 1013 spin_unlock_irqrestore(&sunsu_serio_lock, flags); 1014 1015 return ret; 1016 } 1017 1018 static void sunsu_serio_close(struct serio *serio) 1019 { 1020 struct uart_sunsu_port *up = serio->port_data; 1021 unsigned long flags; 1022 1023 spin_lock_irqsave(&sunsu_serio_lock, flags); 1024 up->serio_open = 0; 1025 spin_unlock_irqrestore(&sunsu_serio_lock, flags); 1026 } 1027 1028 #endif /* CONFIG_SERIO */ 1029 1030 static void sunsu_autoconfig(struct uart_sunsu_port *up) 1031 { 1032 unsigned char status1, status2, scratch, scratch2, scratch3; 1033 unsigned char save_lcr, save_mcr; 1034 unsigned long flags; 1035 1036 if (up->su_type == SU_PORT_NONE) 1037 return; 1038 1039 up->type_probed = PORT_UNKNOWN; 1040 up->port.iotype = UPIO_MEM; 1041 1042 spin_lock_irqsave(&up->port.lock, flags); 1043 1044 if (!(up->port.flags & UPF_BUGGY_UART)) { 1045 /* 1046 * Do a simple existence test first; if we fail this, there's 1047 * no point trying anything else. 1048 * 1049 * 0x80 is used as a nonsense port to prevent against false 1050 * positives due to ISA bus float. The assumption is that 1051 * 0x80 is a non-existent port; which should be safe since 1052 * include/asm/io.h also makes this assumption. 1053 */ 1054 scratch = serial_inp(up, UART_IER); 1055 serial_outp(up, UART_IER, 0); 1056 #ifdef __i386__ 1057 outb(0xff, 0x080); 1058 #endif 1059 scratch2 = serial_inp(up, UART_IER); 1060 serial_outp(up, UART_IER, 0x0f); 1061 #ifdef __i386__ 1062 outb(0, 0x080); 1063 #endif 1064 scratch3 = serial_inp(up, UART_IER); 1065 serial_outp(up, UART_IER, scratch); 1066 if (scratch2 != 0 || scratch3 != 0x0F) 1067 goto out; /* We failed; there's nothing here */ 1068 } 1069 1070 save_mcr = serial_in(up, UART_MCR); 1071 save_lcr = serial_in(up, UART_LCR); 1072 1073 /* 1074 * Check to see if a UART is really there. Certain broken 1075 * internal modems based on the Rockwell chipset fail this 1076 * test, because they apparently don't implement the loopback 1077 * test mode. So this test is skipped on the COM 1 through 1078 * COM 4 ports. This *should* be safe, since no board 1079 * manufacturer would be stupid enough to design a board 1080 * that conflicts with COM 1-4 --- we hope! 1081 */ 1082 if (!(up->port.flags & UPF_SKIP_TEST)) { 1083 serial_outp(up, UART_MCR, UART_MCR_LOOP | 0x0A); 1084 status1 = serial_inp(up, UART_MSR) & 0xF0; 1085 serial_outp(up, UART_MCR, save_mcr); 1086 if (status1 != 0x90) 1087 goto out; /* We failed loopback test */ 1088 } 1089 serial_outp(up, UART_LCR, 0xBF); /* set up for StarTech test */ 1090 serial_outp(up, UART_EFR, 0); /* EFR is the same as FCR */ 1091 serial_outp(up, UART_LCR, 0); 1092 serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO); 1093 scratch = serial_in(up, UART_IIR) >> 6; 1094 switch (scratch) { 1095 case 0: 1096 up->port.type = PORT_16450; 1097 break; 1098 case 1: 1099 up->port.type = PORT_UNKNOWN; 1100 break; 1101 case 2: 1102 up->port.type = PORT_16550; 1103 break; 1104 case 3: 1105 up->port.type = PORT_16550A; 1106 break; 1107 } 1108 if (up->port.type == PORT_16550A) { 1109 /* Check for Startech UART's */ 1110 serial_outp(up, UART_LCR, UART_LCR_DLAB); 1111 if (serial_in(up, UART_EFR) == 0) { 1112 up->port.type = PORT_16650; 1113 } else { 1114 serial_outp(up, UART_LCR, 0xBF); 1115 if (serial_in(up, UART_EFR) == 0) 1116 up->port.type = PORT_16650V2; 1117 } 1118 } 1119 if (up->port.type == PORT_16550A) { 1120 /* Check for TI 16750 */ 1121 serial_outp(up, UART_LCR, save_lcr | UART_LCR_DLAB); 1122 serial_outp(up, UART_FCR, 1123 UART_FCR_ENABLE_FIFO | UART_FCR7_64BYTE); 1124 scratch = serial_in(up, UART_IIR) >> 5; 1125 if (scratch == 7) { 1126 /* 1127 * If this is a 16750, and not a cheap UART 1128 * clone, then it should only go into 64 byte 1129 * mode if the UART_FCR7_64BYTE bit was set 1130 * while UART_LCR_DLAB was latched. 1131 */ 1132 serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO); 1133 serial_outp(up, UART_LCR, 0); 1134 serial_outp(up, UART_FCR, 1135 UART_FCR_ENABLE_FIFO | UART_FCR7_64BYTE); 1136 scratch = serial_in(up, UART_IIR) >> 5; 1137 if (scratch == 6) 1138 up->port.type = PORT_16750; 1139 } 1140 serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO); 1141 } 1142 serial_outp(up, UART_LCR, save_lcr); 1143 if (up->port.type == PORT_16450) { 1144 scratch = serial_in(up, UART_SCR); 1145 serial_outp(up, UART_SCR, 0xa5); 1146 status1 = serial_in(up, UART_SCR); 1147 serial_outp(up, UART_SCR, 0x5a); 1148 status2 = serial_in(up, UART_SCR); 1149 serial_outp(up, UART_SCR, scratch); 1150 1151 if ((status1 != 0xa5) || (status2 != 0x5a)) 1152 up->port.type = PORT_8250; 1153 } 1154 1155 up->port.fifosize = uart_config[up->port.type].dfl_xmit_fifo_size; 1156 1157 if (up->port.type == PORT_UNKNOWN) 1158 goto out; 1159 up->type_probed = up->port.type; /* XXX */ 1160 1161 /* 1162 * Reset the UART. 1163 */ 1164 #ifdef CONFIG_SERIAL_8250_RSA 1165 if (up->port.type == PORT_RSA) 1166 serial_outp(up, UART_RSA_FRR, 0); 1167 #endif 1168 serial_outp(up, UART_MCR, save_mcr); 1169 serial_outp(up, UART_FCR, (UART_FCR_ENABLE_FIFO | 1170 UART_FCR_CLEAR_RCVR | 1171 UART_FCR_CLEAR_XMIT)); 1172 serial_outp(up, UART_FCR, 0); 1173 (void)serial_in(up, UART_RX); 1174 serial_outp(up, UART_IER, 0); 1175 1176 out: 1177 spin_unlock_irqrestore(&up->port.lock, flags); 1178 } 1179 1180 static struct uart_driver sunsu_reg = { 1181 .owner = THIS_MODULE, 1182 .driver_name = "sunsu", 1183 .dev_name = "ttyS", 1184 .major = TTY_MAJOR, 1185 }; 1186 1187 static int sunsu_kbd_ms_init(struct uart_sunsu_port *up) 1188 { 1189 int quot, baud; 1190 #ifdef CONFIG_SERIO 1191 struct serio *serio; 1192 #endif 1193 1194 if (up->su_type == SU_PORT_KBD) { 1195 up->cflag = B1200 | CS8 | CLOCAL | CREAD; 1196 baud = 1200; 1197 } else { 1198 up->cflag = B4800 | CS8 | CLOCAL | CREAD; 1199 baud = 4800; 1200 } 1201 quot = up->port.uartclk / (16 * baud); 1202 1203 sunsu_autoconfig(up); 1204 if (up->port.type == PORT_UNKNOWN) 1205 return -ENODEV; 1206 1207 printk("%pOF: %s port at %llx, irq %u\n", 1208 up->port.dev->of_node, 1209 (up->su_type == SU_PORT_KBD) ? "Keyboard" : "Mouse", 1210 (unsigned long long) up->port.mapbase, 1211 up->port.irq); 1212 1213 #ifdef CONFIG_SERIO 1214 serio = &up->serio; 1215 serio->port_data = up; 1216 1217 serio->id.type = SERIO_RS232; 1218 if (up->su_type == SU_PORT_KBD) { 1219 serio->id.proto = SERIO_SUNKBD; 1220 strlcpy(serio->name, "sukbd", sizeof(serio->name)); 1221 } else { 1222 serio->id.proto = SERIO_SUN; 1223 serio->id.extra = 1; 1224 strlcpy(serio->name, "sums", sizeof(serio->name)); 1225 } 1226 strlcpy(serio->phys, 1227 (!(up->port.line & 1) ? "su/serio0" : "su/serio1"), 1228 sizeof(serio->phys)); 1229 1230 serio->write = sunsu_serio_write; 1231 serio->open = sunsu_serio_open; 1232 serio->close = sunsu_serio_close; 1233 serio->dev.parent = up->port.dev; 1234 1235 serio_register_port(serio); 1236 #endif 1237 1238 sunsu_change_speed(&up->port, up->cflag, 0, quot); 1239 1240 sunsu_startup(&up->port); 1241 return 0; 1242 } 1243 1244 /* 1245 * ------------------------------------------------------------ 1246 * Serial console driver 1247 * ------------------------------------------------------------ 1248 */ 1249 1250 #ifdef CONFIG_SERIAL_SUNSU_CONSOLE 1251 1252 /* 1253 * Wait for transmitter & holding register to empty 1254 */ 1255 static void wait_for_xmitr(struct uart_sunsu_port *up) 1256 { 1257 unsigned int status, tmout = 10000; 1258 1259 /* Wait up to 10ms for the character(s) to be sent. */ 1260 do { 1261 status = serial_in(up, UART_LSR); 1262 1263 if (status & UART_LSR_BI) 1264 up->lsr_break_flag = UART_LSR_BI; 1265 1266 if (--tmout == 0) 1267 break; 1268 udelay(1); 1269 } while (!uart_lsr_tx_empty(status)); 1270 1271 /* Wait up to 1s for flow control if necessary */ 1272 if (up->port.flags & UPF_CONS_FLOW) { 1273 tmout = 1000000; 1274 while (--tmout && 1275 ((serial_in(up, UART_MSR) & UART_MSR_CTS) == 0)) 1276 udelay(1); 1277 } 1278 } 1279 1280 static void sunsu_console_putchar(struct uart_port *port, unsigned char ch) 1281 { 1282 struct uart_sunsu_port *up = 1283 container_of(port, struct uart_sunsu_port, port); 1284 1285 wait_for_xmitr(up); 1286 serial_out(up, UART_TX, ch); 1287 } 1288 1289 /* 1290 * Print a string to the serial port trying not to disturb 1291 * any possible real use of the port... 1292 */ 1293 static void sunsu_console_write(struct console *co, const char *s, 1294 unsigned int count) 1295 { 1296 struct uart_sunsu_port *up = &sunsu_ports[co->index]; 1297 unsigned long flags; 1298 unsigned int ier; 1299 int locked = 1; 1300 1301 if (up->port.sysrq || oops_in_progress) 1302 locked = spin_trylock_irqsave(&up->port.lock, flags); 1303 else 1304 spin_lock_irqsave(&up->port.lock, flags); 1305 1306 /* 1307 * First save the UER then disable the interrupts 1308 */ 1309 ier = serial_in(up, UART_IER); 1310 serial_out(up, UART_IER, 0); 1311 1312 uart_console_write(&up->port, s, count, sunsu_console_putchar); 1313 1314 /* 1315 * Finally, wait for transmitter to become empty 1316 * and restore the IER 1317 */ 1318 wait_for_xmitr(up); 1319 serial_out(up, UART_IER, ier); 1320 1321 if (locked) 1322 spin_unlock_irqrestore(&up->port.lock, flags); 1323 } 1324 1325 /* 1326 * Setup initial baud/bits/parity. We do two things here: 1327 * - construct a cflag setting for the first su_open() 1328 * - initialize the serial port 1329 * Return non-zero if we didn't find a serial port. 1330 */ 1331 static int __init sunsu_console_setup(struct console *co, char *options) 1332 { 1333 static struct ktermios dummy; 1334 struct ktermios termios; 1335 struct uart_port *port; 1336 1337 printk("Console: ttyS%d (SU)\n", 1338 (sunsu_reg.minor - 64) + co->index); 1339 1340 if (co->index > nr_inst) 1341 return -ENODEV; 1342 port = &sunsu_ports[co->index].port; 1343 1344 /* 1345 * Temporary fix. 1346 */ 1347 spin_lock_init(&port->lock); 1348 1349 /* Get firmware console settings. */ 1350 sunserial_console_termios(co, port->dev->of_node); 1351 1352 memset(&termios, 0, sizeof(struct ktermios)); 1353 termios.c_cflag = co->cflag; 1354 port->mctrl |= TIOCM_DTR; 1355 port->ops->set_termios(port, &termios, &dummy); 1356 1357 return 0; 1358 } 1359 1360 static struct console sunsu_console = { 1361 .name = "ttyS", 1362 .write = sunsu_console_write, 1363 .device = uart_console_device, 1364 .setup = sunsu_console_setup, 1365 .flags = CON_PRINTBUFFER, 1366 .index = -1, 1367 .data = &sunsu_reg, 1368 }; 1369 1370 /* 1371 * Register console. 1372 */ 1373 1374 static inline struct console *SUNSU_CONSOLE(void) 1375 { 1376 return &sunsu_console; 1377 } 1378 #else 1379 #define SUNSU_CONSOLE() (NULL) 1380 #define sunsu_serial_console_init() do { } while (0) 1381 #endif 1382 1383 static enum su_type su_get_type(struct device_node *dp) 1384 { 1385 struct device_node *ap = of_find_node_by_path("/aliases"); 1386 enum su_type rc = SU_PORT_PORT; 1387 1388 if (ap) { 1389 const char *keyb = of_get_property(ap, "keyboard", NULL); 1390 const char *ms = of_get_property(ap, "mouse", NULL); 1391 struct device_node *match; 1392 1393 if (keyb) { 1394 match = of_find_node_by_path(keyb); 1395 1396 /* 1397 * The pointer is used as an identifier not 1398 * as a pointer, we can drop the refcount on 1399 * the of__node immediately after getting it. 1400 */ 1401 of_node_put(match); 1402 1403 if (dp == match) { 1404 rc = SU_PORT_KBD; 1405 goto out; 1406 } 1407 } 1408 if (ms) { 1409 match = of_find_node_by_path(ms); 1410 1411 of_node_put(match); 1412 1413 if (dp == match) { 1414 rc = SU_PORT_MS; 1415 goto out; 1416 } 1417 } 1418 } 1419 1420 out: 1421 of_node_put(ap); 1422 return rc; 1423 } 1424 1425 static int su_probe(struct platform_device *op) 1426 { 1427 struct device_node *dp = op->dev.of_node; 1428 struct uart_sunsu_port *up; 1429 struct resource *rp; 1430 enum su_type type; 1431 bool ignore_line; 1432 int err; 1433 1434 type = su_get_type(dp); 1435 if (type == SU_PORT_PORT) { 1436 if (nr_inst >= UART_NR) 1437 return -EINVAL; 1438 up = &sunsu_ports[nr_inst]; 1439 } else { 1440 up = kzalloc(sizeof(*up), GFP_KERNEL); 1441 if (!up) 1442 return -ENOMEM; 1443 } 1444 1445 up->port.line = nr_inst; 1446 1447 spin_lock_init(&up->port.lock); 1448 1449 up->su_type = type; 1450 1451 rp = &op->resource[0]; 1452 up->port.mapbase = rp->start; 1453 up->reg_size = resource_size(rp); 1454 up->port.membase = of_ioremap(rp, 0, up->reg_size, "su"); 1455 if (!up->port.membase) { 1456 if (type != SU_PORT_PORT) 1457 kfree(up); 1458 return -ENOMEM; 1459 } 1460 1461 up->port.irq = op->archdata.irqs[0]; 1462 1463 up->port.dev = &op->dev; 1464 1465 up->port.type = PORT_UNKNOWN; 1466 up->port.uartclk = (SU_BASE_BAUD * 16); 1467 up->port.has_sysrq = IS_ENABLED(CONFIG_SERIAL_SUNSU_CONSOLE); 1468 1469 err = 0; 1470 if (up->su_type == SU_PORT_KBD || up->su_type == SU_PORT_MS) { 1471 err = sunsu_kbd_ms_init(up); 1472 if (err) { 1473 of_iounmap(&op->resource[0], 1474 up->port.membase, up->reg_size); 1475 kfree(up); 1476 return err; 1477 } 1478 platform_set_drvdata(op, up); 1479 1480 nr_inst++; 1481 1482 return 0; 1483 } 1484 1485 up->port.flags |= UPF_BOOT_AUTOCONF; 1486 1487 sunsu_autoconfig(up); 1488 1489 err = -ENODEV; 1490 if (up->port.type == PORT_UNKNOWN) 1491 goto out_unmap; 1492 1493 up->port.ops = &sunsu_pops; 1494 1495 ignore_line = false; 1496 if (of_node_name_eq(dp, "rsc-console") || 1497 of_node_name_eq(dp, "lom-console")) 1498 ignore_line = true; 1499 1500 sunserial_console_match(SUNSU_CONSOLE(), dp, 1501 &sunsu_reg, up->port.line, 1502 ignore_line); 1503 err = uart_add_one_port(&sunsu_reg, &up->port); 1504 if (err) 1505 goto out_unmap; 1506 1507 platform_set_drvdata(op, up); 1508 1509 nr_inst++; 1510 1511 return 0; 1512 1513 out_unmap: 1514 of_iounmap(&op->resource[0], up->port.membase, up->reg_size); 1515 kfree(up); 1516 return err; 1517 } 1518 1519 static int su_remove(struct platform_device *op) 1520 { 1521 struct uart_sunsu_port *up = platform_get_drvdata(op); 1522 bool kbdms = false; 1523 1524 if (up->su_type == SU_PORT_MS || 1525 up->su_type == SU_PORT_KBD) 1526 kbdms = true; 1527 1528 if (kbdms) { 1529 #ifdef CONFIG_SERIO 1530 serio_unregister_port(&up->serio); 1531 #endif 1532 } else if (up->port.type != PORT_UNKNOWN) 1533 uart_remove_one_port(&sunsu_reg, &up->port); 1534 1535 if (up->port.membase) 1536 of_iounmap(&op->resource[0], up->port.membase, up->reg_size); 1537 1538 if (kbdms) 1539 kfree(up); 1540 1541 return 0; 1542 } 1543 1544 static const struct of_device_id su_match[] = { 1545 { 1546 .name = "su", 1547 }, 1548 { 1549 .name = "su_pnp", 1550 }, 1551 { 1552 .name = "serial", 1553 .compatible = "su", 1554 }, 1555 { 1556 .type = "serial", 1557 .compatible = "su", 1558 }, 1559 {}, 1560 }; 1561 MODULE_DEVICE_TABLE(of, su_match); 1562 1563 static struct platform_driver su_driver = { 1564 .driver = { 1565 .name = "su", 1566 .of_match_table = su_match, 1567 }, 1568 .probe = su_probe, 1569 .remove = su_remove, 1570 }; 1571 1572 static int __init sunsu_init(void) 1573 { 1574 struct device_node *dp; 1575 int err; 1576 int num_uart = 0; 1577 1578 for_each_node_by_name(dp, "su") { 1579 if (su_get_type(dp) == SU_PORT_PORT) 1580 num_uart++; 1581 } 1582 for_each_node_by_name(dp, "su_pnp") { 1583 if (su_get_type(dp) == SU_PORT_PORT) 1584 num_uart++; 1585 } 1586 for_each_node_by_name(dp, "serial") { 1587 if (of_device_is_compatible(dp, "su")) { 1588 if (su_get_type(dp) == SU_PORT_PORT) 1589 num_uart++; 1590 } 1591 } 1592 for_each_node_by_type(dp, "serial") { 1593 if (of_device_is_compatible(dp, "su")) { 1594 if (su_get_type(dp) == SU_PORT_PORT) 1595 num_uart++; 1596 } 1597 } 1598 1599 if (num_uart) { 1600 err = sunserial_register_minors(&sunsu_reg, num_uart); 1601 if (err) 1602 return err; 1603 } 1604 1605 err = platform_driver_register(&su_driver); 1606 if (err && num_uart) 1607 sunserial_unregister_minors(&sunsu_reg, num_uart); 1608 1609 return err; 1610 } 1611 1612 static void __exit sunsu_exit(void) 1613 { 1614 platform_driver_unregister(&su_driver); 1615 if (sunsu_reg.nr) 1616 sunserial_unregister_minors(&sunsu_reg, sunsu_reg.nr); 1617 } 1618 1619 module_init(sunsu_init); 1620 module_exit(sunsu_exit); 1621 1622 MODULE_AUTHOR("Eddie C. Dost, Peter Zaitcev, and David S. Miller"); 1623 MODULE_DESCRIPTION("Sun SU serial port driver"); 1624 MODULE_VERSION("2.0"); 1625 MODULE_LICENSE("GPL"); 1626