Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * linux/drivers/char/amiserial.c |
| 3 | * |
| 4 | * Serial driver for the amiga builtin port. |
| 5 | * |
| 6 | * This code was created by taking serial.c version 4.30 from kernel |
| 7 | * release 2.3.22, replacing all hardware related stuff with the |
| 8 | * corresponding amiga hardware actions, and removing all irrelevant |
| 9 | * code. As a consequence, it uses many of the constants and names |
| 10 | * associated with the registers and bits of 16550 compatible UARTS - |
| 11 | * but only to keep track of status, etc in the state variables. It |
| 12 | * was done this was to make it easier to keep the code in line with |
| 13 | * (non hardware specific) changes to serial.c. |
| 14 | * |
| 15 | * The port is registered with the tty driver as minor device 64, and |
| 16 | * therefore other ports should should only use 65 upwards. |
| 17 | * |
| 18 | * Richard Lucock 28/12/99 |
| 19 | * |
| 20 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 21 | * Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, |
| 22 | * 1998, 1999 Theodore Ts'o |
| 23 | * |
| 24 | */ |
| 25 | |
| 26 | /* |
| 27 | * Serial driver configuration section. Here are the various options: |
| 28 | * |
| 29 | * SERIAL_PARANOIA_CHECK |
| 30 | * Check the magic number for the async_structure where |
| 31 | * ever possible. |
| 32 | */ |
| 33 | |
| 34 | #include <linux/config.h> |
| 35 | #include <linux/delay.h> |
| 36 | |
| 37 | #undef SERIAL_PARANOIA_CHECK |
| 38 | #define SERIAL_DO_RESTART |
| 39 | |
| 40 | /* Set of debugging defines */ |
| 41 | |
| 42 | #undef SERIAL_DEBUG_INTR |
| 43 | #undef SERIAL_DEBUG_OPEN |
| 44 | #undef SERIAL_DEBUG_FLOW |
| 45 | #undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT |
| 46 | |
| 47 | /* Sanity checks */ |
| 48 | |
| 49 | #define SERIAL_INLINE |
| 50 | |
| 51 | #if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT) |
| 52 | #define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \ |
| 53 | tty->name, (info->flags), serial_driver->refcount,info->count,tty->count,s) |
| 54 | #else |
| 55 | #define DBG_CNT(s) |
| 56 | #endif |
| 57 | |
| 58 | /* |
| 59 | * End of serial driver configuration section. |
| 60 | */ |
| 61 | |
| 62 | #include <linux/module.h> |
| 63 | |
| 64 | #include <linux/types.h> |
| 65 | #include <linux/serial.h> |
| 66 | #include <linux/serialP.h> |
| 67 | #include <linux/serial_reg.h> |
| 68 | static char *serial_version = "4.30"; |
| 69 | |
| 70 | #include <linux/errno.h> |
| 71 | #include <linux/signal.h> |
| 72 | #include <linux/sched.h> |
| 73 | #include <linux/kernel.h> |
| 74 | #include <linux/timer.h> |
| 75 | #include <linux/interrupt.h> |
| 76 | #include <linux/tty.h> |
| 77 | #include <linux/tty_flip.h> |
| 78 | #include <linux/console.h> |
| 79 | #include <linux/major.h> |
| 80 | #include <linux/string.h> |
| 81 | #include <linux/fcntl.h> |
| 82 | #include <linux/ptrace.h> |
| 83 | #include <linux/ioport.h> |
| 84 | #include <linux/mm.h> |
| 85 | #include <linux/slab.h> |
| 86 | #include <linux/init.h> |
| 87 | #include <linux/bitops.h> |
| 88 | |
| 89 | #include <asm/setup.h> |
| 90 | |
| 91 | #include <asm/system.h> |
| 92 | |
| 93 | #include <asm/irq.h> |
| 94 | |
| 95 | #include <asm/amigahw.h> |
| 96 | #include <asm/amigaints.h> |
| 97 | |
| 98 | #ifdef SERIAL_INLINE |
| 99 | #define _INLINE_ inline |
| 100 | #endif |
| 101 | |
| 102 | static char *serial_name = "Amiga-builtin serial driver"; |
| 103 | |
| 104 | static struct tty_driver *serial_driver; |
| 105 | |
| 106 | /* number of characters left in xmit buffer before we ask for more */ |
| 107 | #define WAKEUP_CHARS 256 |
| 108 | |
| 109 | static struct async_struct *IRQ_ports; |
| 110 | |
| 111 | static unsigned char current_ctl_bits; |
| 112 | |
| 113 | static void change_speed(struct async_struct *info, struct termios *old); |
| 114 | static void rs_wait_until_sent(struct tty_struct *tty, int timeout); |
| 115 | |
| 116 | |
| 117 | static struct serial_state rs_table[1]; |
| 118 | |
| 119 | #define NR_PORTS (sizeof(rs_table)/sizeof(struct serial_state)) |
| 120 | |
| 121 | /* |
| 122 | * tmp_buf is used as a temporary buffer by serial_write. We need to |
| 123 | * lock it in case the copy_from_user blocks while swapping in a page, |
| 124 | * and some other program tries to do a serial write at the same time. |
| 125 | * Since the lock will only come under contention when the system is |
| 126 | * swapping and available memory is low, it makes sense to share one |
| 127 | * buffer across all the serial ports, since it significantly saves |
| 128 | * memory if large numbers of serial ports are open. |
| 129 | */ |
| 130 | static unsigned char *tmp_buf; |
| 131 | static DECLARE_MUTEX(tmp_buf_sem); |
| 132 | |
| 133 | #include <asm/uaccess.h> |
| 134 | |
| 135 | #define serial_isroot() (capable(CAP_SYS_ADMIN)) |
| 136 | |
| 137 | |
| 138 | static inline int serial_paranoia_check(struct async_struct *info, |
| 139 | char *name, const char *routine) |
| 140 | { |
| 141 | #ifdef SERIAL_PARANOIA_CHECK |
| 142 | static const char *badmagic = |
| 143 | "Warning: bad magic number for serial struct (%s) in %s\n"; |
| 144 | static const char *badinfo = |
| 145 | "Warning: null async_struct for (%s) in %s\n"; |
| 146 | |
| 147 | if (!info) { |
| 148 | printk(badinfo, name, routine); |
| 149 | return 1; |
| 150 | } |
| 151 | if (info->magic != SERIAL_MAGIC) { |
| 152 | printk(badmagic, name, routine); |
| 153 | return 1; |
| 154 | } |
| 155 | #endif |
| 156 | return 0; |
| 157 | } |
| 158 | |
| 159 | /* some serial hardware definitions */ |
| 160 | #define SDR_OVRUN (1<<15) |
| 161 | #define SDR_RBF (1<<14) |
| 162 | #define SDR_TBE (1<<13) |
| 163 | #define SDR_TSRE (1<<12) |
| 164 | |
| 165 | #define SERPER_PARENB (1<<15) |
| 166 | |
| 167 | #define AC_SETCLR (1<<15) |
| 168 | #define AC_UARTBRK (1<<11) |
| 169 | |
| 170 | #define SER_DTR (1<<7) |
| 171 | #define SER_RTS (1<<6) |
| 172 | #define SER_DCD (1<<5) |
| 173 | #define SER_CTS (1<<4) |
| 174 | #define SER_DSR (1<<3) |
| 175 | |
| 176 | static __inline__ void rtsdtr_ctrl(int bits) |
| 177 | { |
| 178 | ciab.pra = ((bits & (SER_RTS | SER_DTR)) ^ (SER_RTS | SER_DTR)) | (ciab.pra & ~(SER_RTS | SER_DTR)); |
| 179 | } |
| 180 | |
| 181 | /* |
| 182 | * ------------------------------------------------------------ |
| 183 | * rs_stop() and rs_start() |
| 184 | * |
| 185 | * This routines are called before setting or resetting tty->stopped. |
| 186 | * They enable or disable transmitter interrupts, as necessary. |
| 187 | * ------------------------------------------------------------ |
| 188 | */ |
| 189 | static void rs_stop(struct tty_struct *tty) |
| 190 | { |
| 191 | struct async_struct *info = (struct async_struct *)tty->driver_data; |
| 192 | unsigned long flags; |
| 193 | |
| 194 | if (serial_paranoia_check(info, tty->name, "rs_stop")) |
| 195 | return; |
| 196 | |
| 197 | local_irq_save(flags); |
| 198 | if (info->IER & UART_IER_THRI) { |
| 199 | info->IER &= ~UART_IER_THRI; |
| 200 | /* disable Tx interrupt and remove any pending interrupts */ |
| 201 | custom.intena = IF_TBE; |
| 202 | mb(); |
| 203 | custom.intreq = IF_TBE; |
| 204 | mb(); |
| 205 | } |
| 206 | local_irq_restore(flags); |
| 207 | } |
| 208 | |
| 209 | static void rs_start(struct tty_struct *tty) |
| 210 | { |
| 211 | struct async_struct *info = (struct async_struct *)tty->driver_data; |
| 212 | unsigned long flags; |
| 213 | |
| 214 | if (serial_paranoia_check(info, tty->name, "rs_start")) |
| 215 | return; |
| 216 | |
| 217 | local_irq_save(flags); |
| 218 | if (info->xmit.head != info->xmit.tail |
| 219 | && info->xmit.buf |
| 220 | && !(info->IER & UART_IER_THRI)) { |
| 221 | info->IER |= UART_IER_THRI; |
| 222 | custom.intena = IF_SETCLR | IF_TBE; |
| 223 | mb(); |
| 224 | /* set a pending Tx Interrupt, transmitter should restart now */ |
| 225 | custom.intreq = IF_SETCLR | IF_TBE; |
| 226 | mb(); |
| 227 | } |
| 228 | local_irq_restore(flags); |
| 229 | } |
| 230 | |
| 231 | /* |
| 232 | * ---------------------------------------------------------------------- |
| 233 | * |
| 234 | * Here starts the interrupt handling routines. All of the following |
| 235 | * subroutines are declared as inline and are folded into |
| 236 | * rs_interrupt(). They were separated out for readability's sake. |
| 237 | * |
| 238 | * Note: rs_interrupt() is a "fast" interrupt, which means that it |
| 239 | * runs with interrupts turned off. People who may want to modify |
| 240 | * rs_interrupt() should try to keep the interrupt handler as fast as |
| 241 | * possible. After you are done making modifications, it is not a bad |
| 242 | * idea to do: |
| 243 | * |
| 244 | * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c |
| 245 | * |
| 246 | * and look at the resulting assemble code in serial.s. |
| 247 | * |
| 248 | * - Ted Ts'o (tytso@mit.edu), 7-Mar-93 |
| 249 | * ----------------------------------------------------------------------- |
| 250 | */ |
| 251 | |
| 252 | /* |
| 253 | * This routine is used by the interrupt handler to schedule |
| 254 | * processing in the software interrupt portion of the driver. |
| 255 | */ |
| 256 | static _INLINE_ void rs_sched_event(struct async_struct *info, |
| 257 | int event) |
| 258 | { |
| 259 | info->event |= 1 << event; |
| 260 | tasklet_schedule(&info->tlet); |
| 261 | } |
| 262 | |
| 263 | static _INLINE_ void receive_chars(struct async_struct *info) |
| 264 | { |
| 265 | int status; |
| 266 | int serdatr; |
| 267 | struct tty_struct *tty = info->tty; |
| 268 | unsigned char ch; |
| 269 | struct async_icount *icount; |
| 270 | |
| 271 | icount = &info->state->icount; |
| 272 | |
| 273 | status = UART_LSR_DR; /* We obviously have a character! */ |
| 274 | serdatr = custom.serdatr; |
| 275 | mb(); |
| 276 | custom.intreq = IF_RBF; |
| 277 | mb(); |
| 278 | |
| 279 | if((serdatr & 0x1ff) == 0) |
| 280 | status |= UART_LSR_BI; |
| 281 | if(serdatr & SDR_OVRUN) |
| 282 | status |= UART_LSR_OE; |
| 283 | |
| 284 | ch = serdatr & 0xff; |
| 285 | if (tty->flip.count >= TTY_FLIPBUF_SIZE) |
| 286 | goto ignore_char; |
| 287 | *tty->flip.char_buf_ptr = ch; |
| 288 | icount->rx++; |
| 289 | |
| 290 | #ifdef SERIAL_DEBUG_INTR |
| 291 | printk("DR%02x:%02x...", ch, status); |
| 292 | #endif |
| 293 | *tty->flip.flag_buf_ptr = 0; |
| 294 | |
| 295 | /* |
| 296 | * We don't handle parity or frame errors - but I have left |
| 297 | * the code in, since I'm not sure that the errors can't be |
| 298 | * detected. |
| 299 | */ |
| 300 | |
| 301 | if (status & (UART_LSR_BI | UART_LSR_PE | |
| 302 | UART_LSR_FE | UART_LSR_OE)) { |
| 303 | /* |
| 304 | * For statistics only |
| 305 | */ |
| 306 | if (status & UART_LSR_BI) { |
| 307 | status &= ~(UART_LSR_FE | UART_LSR_PE); |
| 308 | icount->brk++; |
| 309 | } else if (status & UART_LSR_PE) |
| 310 | icount->parity++; |
| 311 | else if (status & UART_LSR_FE) |
| 312 | icount->frame++; |
| 313 | if (status & UART_LSR_OE) |
| 314 | icount->overrun++; |
| 315 | |
| 316 | /* |
| 317 | * Now check to see if character should be |
| 318 | * ignored, and mask off conditions which |
| 319 | * should be ignored. |
| 320 | */ |
| 321 | if (status & info->ignore_status_mask) |
| 322 | goto ignore_char; |
| 323 | |
| 324 | status &= info->read_status_mask; |
| 325 | |
| 326 | if (status & (UART_LSR_BI)) { |
| 327 | #ifdef SERIAL_DEBUG_INTR |
| 328 | printk("handling break...."); |
| 329 | #endif |
| 330 | *tty->flip.flag_buf_ptr = TTY_BREAK; |
| 331 | if (info->flags & ASYNC_SAK) |
| 332 | do_SAK(tty); |
| 333 | } else if (status & UART_LSR_PE) |
| 334 | *tty->flip.flag_buf_ptr = TTY_PARITY; |
| 335 | else if (status & UART_LSR_FE) |
| 336 | *tty->flip.flag_buf_ptr = TTY_FRAME; |
| 337 | if (status & UART_LSR_OE) { |
| 338 | /* |
| 339 | * Overrun is special, since it's |
| 340 | * reported immediately, and doesn't |
| 341 | * affect the current character |
| 342 | */ |
| 343 | if (tty->flip.count < TTY_FLIPBUF_SIZE) { |
| 344 | tty->flip.count++; |
| 345 | tty->flip.flag_buf_ptr++; |
| 346 | tty->flip.char_buf_ptr++; |
| 347 | *tty->flip.flag_buf_ptr = TTY_OVERRUN; |
| 348 | } |
| 349 | } |
| 350 | } |
| 351 | tty->flip.flag_buf_ptr++; |
| 352 | tty->flip.char_buf_ptr++; |
| 353 | tty->flip.count++; |
| 354 | ignore_char: |
| 355 | |
| 356 | tty_flip_buffer_push(tty); |
| 357 | } |
| 358 | |
| 359 | static _INLINE_ void transmit_chars(struct async_struct *info) |
| 360 | { |
| 361 | custom.intreq = IF_TBE; |
| 362 | mb(); |
| 363 | if (info->x_char) { |
| 364 | custom.serdat = info->x_char | 0x100; |
| 365 | mb(); |
| 366 | info->state->icount.tx++; |
| 367 | info->x_char = 0; |
| 368 | return; |
| 369 | } |
| 370 | if (info->xmit.head == info->xmit.tail |
| 371 | || info->tty->stopped |
| 372 | || info->tty->hw_stopped) { |
| 373 | info->IER &= ~UART_IER_THRI; |
| 374 | custom.intena = IF_TBE; |
| 375 | mb(); |
| 376 | return; |
| 377 | } |
| 378 | |
| 379 | custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100; |
| 380 | mb(); |
| 381 | info->xmit.tail = info->xmit.tail & (SERIAL_XMIT_SIZE-1); |
| 382 | info->state->icount.tx++; |
| 383 | |
| 384 | if (CIRC_CNT(info->xmit.head, |
| 385 | info->xmit.tail, |
| 386 | SERIAL_XMIT_SIZE) < WAKEUP_CHARS) |
| 387 | rs_sched_event(info, RS_EVENT_WRITE_WAKEUP); |
| 388 | |
| 389 | #ifdef SERIAL_DEBUG_INTR |
| 390 | printk("THRE..."); |
| 391 | #endif |
| 392 | if (info->xmit.head == info->xmit.tail) { |
| 393 | custom.intena = IF_TBE; |
| 394 | mb(); |
| 395 | info->IER &= ~UART_IER_THRI; |
| 396 | } |
| 397 | } |
| 398 | |
| 399 | static _INLINE_ void check_modem_status(struct async_struct *info) |
| 400 | { |
| 401 | unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR); |
| 402 | unsigned char dstatus; |
| 403 | struct async_icount *icount; |
| 404 | |
| 405 | /* Determine bits that have changed */ |
| 406 | dstatus = status ^ current_ctl_bits; |
| 407 | current_ctl_bits = status; |
| 408 | |
| 409 | if (dstatus) { |
| 410 | icount = &info->state->icount; |
| 411 | /* update input line counters */ |
| 412 | if (dstatus & SER_DSR) |
| 413 | icount->dsr++; |
| 414 | if (dstatus & SER_DCD) { |
| 415 | icount->dcd++; |
| 416 | #ifdef CONFIG_HARD_PPS |
| 417 | if ((info->flags & ASYNC_HARDPPS_CD) && |
| 418 | !(status & SER_DCD)) |
| 419 | hardpps(); |
| 420 | #endif |
| 421 | } |
| 422 | if (dstatus & SER_CTS) |
| 423 | icount->cts++; |
| 424 | wake_up_interruptible(&info->delta_msr_wait); |
| 425 | } |
| 426 | |
| 427 | if ((info->flags & ASYNC_CHECK_CD) && (dstatus & SER_DCD)) { |
| 428 | #if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR)) |
| 429 | printk("ttyS%d CD now %s...", info->line, |
| 430 | (!(status & SER_DCD)) ? "on" : "off"); |
| 431 | #endif |
| 432 | if (!(status & SER_DCD)) |
| 433 | wake_up_interruptible(&info->open_wait); |
| 434 | else { |
| 435 | #ifdef SERIAL_DEBUG_OPEN |
| 436 | printk("doing serial hangup..."); |
| 437 | #endif |
| 438 | if (info->tty) |
| 439 | tty_hangup(info->tty); |
| 440 | } |
| 441 | } |
| 442 | if (info->flags & ASYNC_CTS_FLOW) { |
| 443 | if (info->tty->hw_stopped) { |
| 444 | if (!(status & SER_CTS)) { |
| 445 | #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW)) |
| 446 | printk("CTS tx start..."); |
| 447 | #endif |
| 448 | info->tty->hw_stopped = 0; |
| 449 | info->IER |= UART_IER_THRI; |
| 450 | custom.intena = IF_SETCLR | IF_TBE; |
| 451 | mb(); |
| 452 | /* set a pending Tx Interrupt, transmitter should restart now */ |
| 453 | custom.intreq = IF_SETCLR | IF_TBE; |
| 454 | mb(); |
| 455 | rs_sched_event(info, RS_EVENT_WRITE_WAKEUP); |
| 456 | return; |
| 457 | } |
| 458 | } else { |
| 459 | if ((status & SER_CTS)) { |
| 460 | #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW)) |
| 461 | printk("CTS tx stop..."); |
| 462 | #endif |
| 463 | info->tty->hw_stopped = 1; |
| 464 | info->IER &= ~UART_IER_THRI; |
| 465 | /* disable Tx interrupt and remove any pending interrupts */ |
| 466 | custom.intena = IF_TBE; |
| 467 | mb(); |
| 468 | custom.intreq = IF_TBE; |
| 469 | mb(); |
| 470 | } |
| 471 | } |
| 472 | } |
| 473 | } |
| 474 | |
| 475 | static irqreturn_t ser_vbl_int( int irq, void *data, struct pt_regs *regs) |
| 476 | { |
| 477 | /* vbl is just a periodic interrupt we tie into to update modem status */ |
| 478 | struct async_struct * info = IRQ_ports; |
| 479 | /* |
| 480 | * TBD - is it better to unregister from this interrupt or to |
| 481 | * ignore it if MSI is clear ? |
| 482 | */ |
| 483 | if(info->IER & UART_IER_MSI) |
| 484 | check_modem_status(info); |
| 485 | return IRQ_HANDLED; |
| 486 | } |
| 487 | |
| 488 | static irqreturn_t ser_rx_int(int irq, void *dev_id, struct pt_regs * regs) |
| 489 | { |
| 490 | struct async_struct * info; |
| 491 | |
| 492 | #ifdef SERIAL_DEBUG_INTR |
| 493 | printk("ser_rx_int..."); |
| 494 | #endif |
| 495 | |
| 496 | info = IRQ_ports; |
| 497 | if (!info || !info->tty) |
| 498 | return IRQ_NONE; |
| 499 | |
| 500 | receive_chars(info); |
| 501 | info->last_active = jiffies; |
| 502 | #ifdef SERIAL_DEBUG_INTR |
| 503 | printk("end.\n"); |
| 504 | #endif |
| 505 | return IRQ_HANDLED; |
| 506 | } |
| 507 | |
| 508 | static irqreturn_t ser_tx_int(int irq, void *dev_id, struct pt_regs * regs) |
| 509 | { |
| 510 | struct async_struct * info; |
| 511 | |
| 512 | if (custom.serdatr & SDR_TBE) { |
| 513 | #ifdef SERIAL_DEBUG_INTR |
| 514 | printk("ser_tx_int..."); |
| 515 | #endif |
| 516 | |
| 517 | info = IRQ_ports; |
| 518 | if (!info || !info->tty) |
| 519 | return IRQ_NONE; |
| 520 | |
| 521 | transmit_chars(info); |
| 522 | info->last_active = jiffies; |
| 523 | #ifdef SERIAL_DEBUG_INTR |
| 524 | printk("end.\n"); |
| 525 | #endif |
| 526 | } |
| 527 | return IRQ_HANDLED; |
| 528 | } |
| 529 | |
| 530 | /* |
| 531 | * ------------------------------------------------------------------- |
| 532 | * Here ends the serial interrupt routines. |
| 533 | * ------------------------------------------------------------------- |
| 534 | */ |
| 535 | |
| 536 | /* |
| 537 | * This routine is used to handle the "bottom half" processing for the |
| 538 | * serial driver, known also the "software interrupt" processing. |
| 539 | * This processing is done at the kernel interrupt level, after the |
| 540 | * rs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON. This |
| 541 | * is where time-consuming activities which can not be done in the |
| 542 | * interrupt driver proper are done; the interrupt driver schedules |
| 543 | * them using rs_sched_event(), and they get done here. |
| 544 | */ |
| 545 | |
| 546 | static void do_softint(unsigned long private_) |
| 547 | { |
| 548 | struct async_struct *info = (struct async_struct *) private_; |
| 549 | struct tty_struct *tty; |
| 550 | |
| 551 | tty = info->tty; |
| 552 | if (!tty) |
| 553 | return; |
| 554 | |
| 555 | if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) { |
| 556 | tty_wakeup(tty); |
| 557 | wake_up_interruptible(&tty->write_wait); |
| 558 | } |
| 559 | } |
| 560 | |
| 561 | /* |
| 562 | * --------------------------------------------------------------- |
| 563 | * Low level utility subroutines for the serial driver: routines to |
| 564 | * figure out the appropriate timeout for an interrupt chain, routines |
| 565 | * to initialize and startup a serial port, and routines to shutdown a |
| 566 | * serial port. Useful stuff like that. |
| 567 | * --------------------------------------------------------------- |
| 568 | */ |
| 569 | |
| 570 | static int startup(struct async_struct * info) |
| 571 | { |
| 572 | unsigned long flags; |
| 573 | int retval=0; |
| 574 | unsigned long page; |
| 575 | |
| 576 | page = get_zeroed_page(GFP_KERNEL); |
| 577 | if (!page) |
| 578 | return -ENOMEM; |
| 579 | |
| 580 | local_irq_save(flags); |
| 581 | |
| 582 | if (info->flags & ASYNC_INITIALIZED) { |
| 583 | free_page(page); |
| 584 | goto errout; |
| 585 | } |
| 586 | |
| 587 | if (info->xmit.buf) |
| 588 | free_page(page); |
| 589 | else |
| 590 | info->xmit.buf = (unsigned char *) page; |
| 591 | |
| 592 | #ifdef SERIAL_DEBUG_OPEN |
| 593 | printk("starting up ttys%d ...", info->line); |
| 594 | #endif |
| 595 | |
| 596 | /* Clear anything in the input buffer */ |
| 597 | |
| 598 | custom.intreq = IF_RBF; |
| 599 | mb(); |
| 600 | |
| 601 | retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info); |
| 602 | if (retval) { |
| 603 | if (serial_isroot()) { |
| 604 | if (info->tty) |
| 605 | set_bit(TTY_IO_ERROR, |
| 606 | &info->tty->flags); |
| 607 | retval = 0; |
| 608 | } |
| 609 | goto errout; |
| 610 | } |
| 611 | |
| 612 | /* enable both Rx and Tx interrupts */ |
| 613 | custom.intena = IF_SETCLR | IF_RBF | IF_TBE; |
| 614 | mb(); |
| 615 | info->IER = UART_IER_MSI; |
| 616 | |
| 617 | /* remember current state of the DCD and CTS bits */ |
| 618 | current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR); |
| 619 | |
| 620 | IRQ_ports = info; |
| 621 | |
| 622 | info->MCR = 0; |
| 623 | if (info->tty->termios->c_cflag & CBAUD) |
| 624 | info->MCR = SER_DTR | SER_RTS; |
| 625 | rtsdtr_ctrl(info->MCR); |
| 626 | |
| 627 | if (info->tty) |
| 628 | clear_bit(TTY_IO_ERROR, &info->tty->flags); |
| 629 | info->xmit.head = info->xmit.tail = 0; |
| 630 | |
| 631 | /* |
| 632 | * Set up the tty->alt_speed kludge |
| 633 | */ |
| 634 | if (info->tty) { |
| 635 | if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI) |
| 636 | info->tty->alt_speed = 57600; |
| 637 | if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI) |
| 638 | info->tty->alt_speed = 115200; |
| 639 | if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI) |
| 640 | info->tty->alt_speed = 230400; |
| 641 | if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP) |
| 642 | info->tty->alt_speed = 460800; |
| 643 | } |
| 644 | |
| 645 | /* |
| 646 | * and set the speed of the serial port |
| 647 | */ |
| 648 | change_speed(info, NULL); |
| 649 | |
| 650 | info->flags |= ASYNC_INITIALIZED; |
| 651 | local_irq_restore(flags); |
| 652 | return 0; |
| 653 | |
| 654 | errout: |
| 655 | local_irq_restore(flags); |
| 656 | return retval; |
| 657 | } |
| 658 | |
| 659 | /* |
| 660 | * This routine will shutdown a serial port; interrupts are disabled, and |
| 661 | * DTR is dropped if the hangup on close termio flag is on. |
| 662 | */ |
| 663 | static void shutdown(struct async_struct * info) |
| 664 | { |
| 665 | unsigned long flags; |
| 666 | struct serial_state *state; |
| 667 | |
| 668 | if (!(info->flags & ASYNC_INITIALIZED)) |
| 669 | return; |
| 670 | |
| 671 | state = info->state; |
| 672 | |
| 673 | #ifdef SERIAL_DEBUG_OPEN |
| 674 | printk("Shutting down serial port %d ....\n", info->line); |
| 675 | #endif |
| 676 | |
| 677 | local_irq_save(flags); /* Disable interrupts */ |
| 678 | |
| 679 | /* |
| 680 | * clear delta_msr_wait queue to avoid mem leaks: we may free the irq |
| 681 | * here so the queue might never be waken up |
| 682 | */ |
| 683 | wake_up_interruptible(&info->delta_msr_wait); |
| 684 | |
| 685 | IRQ_ports = NULL; |
| 686 | |
| 687 | /* |
| 688 | * Free the IRQ, if necessary |
| 689 | */ |
| 690 | free_irq(IRQ_AMIGA_VERTB, info); |
| 691 | |
| 692 | if (info->xmit.buf) { |
| 693 | free_page((unsigned long) info->xmit.buf); |
| 694 | info->xmit.buf = NULL; |
| 695 | } |
| 696 | |
| 697 | info->IER = 0; |
| 698 | custom.intena = IF_RBF | IF_TBE; |
| 699 | mb(); |
| 700 | |
| 701 | /* disable break condition */ |
| 702 | custom.adkcon = AC_UARTBRK; |
| 703 | mb(); |
| 704 | |
| 705 | if (!info->tty || (info->tty->termios->c_cflag & HUPCL)) |
| 706 | info->MCR &= ~(SER_DTR|SER_RTS); |
| 707 | rtsdtr_ctrl(info->MCR); |
| 708 | |
| 709 | if (info->tty) |
| 710 | set_bit(TTY_IO_ERROR, &info->tty->flags); |
| 711 | |
| 712 | info->flags &= ~ASYNC_INITIALIZED; |
| 713 | local_irq_restore(flags); |
| 714 | } |
| 715 | |
| 716 | |
| 717 | /* |
| 718 | * This routine is called to set the UART divisor registers to match |
| 719 | * the specified baud rate for a serial port. |
| 720 | */ |
| 721 | static void change_speed(struct async_struct *info, |
| 722 | struct termios *old_termios) |
| 723 | { |
| 724 | int quot = 0, baud_base, baud; |
| 725 | unsigned cflag, cval = 0; |
| 726 | int bits; |
| 727 | unsigned long flags; |
| 728 | |
| 729 | if (!info->tty || !info->tty->termios) |
| 730 | return; |
| 731 | cflag = info->tty->termios->c_cflag; |
| 732 | |
| 733 | /* Byte size is always 8 bits plus parity bit if requested */ |
| 734 | |
| 735 | cval = 3; bits = 10; |
| 736 | if (cflag & CSTOPB) { |
| 737 | cval |= 0x04; |
| 738 | bits++; |
| 739 | } |
| 740 | if (cflag & PARENB) { |
| 741 | cval |= UART_LCR_PARITY; |
| 742 | bits++; |
| 743 | } |
| 744 | if (!(cflag & PARODD)) |
| 745 | cval |= UART_LCR_EPAR; |
| 746 | #ifdef CMSPAR |
| 747 | if (cflag & CMSPAR) |
| 748 | cval |= UART_LCR_SPAR; |
| 749 | #endif |
| 750 | |
| 751 | /* Determine divisor based on baud rate */ |
| 752 | baud = tty_get_baud_rate(info->tty); |
| 753 | if (!baud) |
| 754 | baud = 9600; /* B0 transition handled in rs_set_termios */ |
| 755 | baud_base = info->state->baud_base; |
| 756 | if (baud == 38400 && |
| 757 | ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)) |
| 758 | quot = info->state->custom_divisor; |
| 759 | else { |
| 760 | if (baud == 134) |
| 761 | /* Special case since 134 is really 134.5 */ |
| 762 | quot = (2*baud_base / 269); |
| 763 | else if (baud) |
| 764 | quot = baud_base / baud; |
| 765 | } |
| 766 | /* If the quotient is zero refuse the change */ |
| 767 | if (!quot && old_termios) { |
| 768 | info->tty->termios->c_cflag &= ~CBAUD; |
| 769 | info->tty->termios->c_cflag |= (old_termios->c_cflag & CBAUD); |
| 770 | baud = tty_get_baud_rate(info->tty); |
| 771 | if (!baud) |
| 772 | baud = 9600; |
| 773 | if (baud == 38400 && |
| 774 | ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)) |
| 775 | quot = info->state->custom_divisor; |
| 776 | else { |
| 777 | if (baud == 134) |
| 778 | /* Special case since 134 is really 134.5 */ |
| 779 | quot = (2*baud_base / 269); |
| 780 | else if (baud) |
| 781 | quot = baud_base / baud; |
| 782 | } |
| 783 | } |
| 784 | /* As a last resort, if the quotient is zero, default to 9600 bps */ |
| 785 | if (!quot) |
| 786 | quot = baud_base / 9600; |
| 787 | info->quot = quot; |
| 788 | info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base); |
| 789 | info->timeout += HZ/50; /* Add .02 seconds of slop */ |
| 790 | |
| 791 | /* CTS flow control flag and modem status interrupts */ |
| 792 | info->IER &= ~UART_IER_MSI; |
| 793 | if (info->flags & ASYNC_HARDPPS_CD) |
| 794 | info->IER |= UART_IER_MSI; |
| 795 | if (cflag & CRTSCTS) { |
| 796 | info->flags |= ASYNC_CTS_FLOW; |
| 797 | info->IER |= UART_IER_MSI; |
| 798 | } else |
| 799 | info->flags &= ~ASYNC_CTS_FLOW; |
| 800 | if (cflag & CLOCAL) |
| 801 | info->flags &= ~ASYNC_CHECK_CD; |
| 802 | else { |
| 803 | info->flags |= ASYNC_CHECK_CD; |
| 804 | info->IER |= UART_IER_MSI; |
| 805 | } |
| 806 | /* TBD: |
| 807 | * Does clearing IER_MSI imply that we should disbale the VBL interrupt ? |
| 808 | */ |
| 809 | |
| 810 | /* |
| 811 | * Set up parity check flag |
| 812 | */ |
| 813 | #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK)) |
| 814 | |
| 815 | info->read_status_mask = UART_LSR_OE | UART_LSR_DR; |
| 816 | if (I_INPCK(info->tty)) |
| 817 | info->read_status_mask |= UART_LSR_FE | UART_LSR_PE; |
| 818 | if (I_BRKINT(info->tty) || I_PARMRK(info->tty)) |
| 819 | info->read_status_mask |= UART_LSR_BI; |
| 820 | |
| 821 | /* |
| 822 | * Characters to ignore |
| 823 | */ |
| 824 | info->ignore_status_mask = 0; |
| 825 | if (I_IGNPAR(info->tty)) |
| 826 | info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; |
| 827 | if (I_IGNBRK(info->tty)) { |
| 828 | info->ignore_status_mask |= UART_LSR_BI; |
| 829 | /* |
| 830 | * If we're ignore parity and break indicators, ignore |
| 831 | * overruns too. (For real raw support). |
| 832 | */ |
| 833 | if (I_IGNPAR(info->tty)) |
| 834 | info->ignore_status_mask |= UART_LSR_OE; |
| 835 | } |
| 836 | /* |
| 837 | * !!! ignore all characters if CREAD is not set |
| 838 | */ |
| 839 | if ((cflag & CREAD) == 0) |
| 840 | info->ignore_status_mask |= UART_LSR_DR; |
| 841 | local_irq_save(flags); |
| 842 | |
| 843 | { |
| 844 | short serper; |
| 845 | |
| 846 | /* Set up the baud rate */ |
| 847 | serper = quot - 1; |
| 848 | |
| 849 | /* Enable or disable parity bit */ |
| 850 | |
| 851 | if(cval & UART_LCR_PARITY) |
| 852 | serper |= (SERPER_PARENB); |
| 853 | |
| 854 | custom.serper = serper; |
| 855 | mb(); |
| 856 | } |
| 857 | |
| 858 | info->LCR = cval; /* Save LCR */ |
| 859 | local_irq_restore(flags); |
| 860 | } |
| 861 | |
| 862 | static void rs_put_char(struct tty_struct *tty, unsigned char ch) |
| 863 | { |
| 864 | struct async_struct *info = (struct async_struct *)tty->driver_data; |
| 865 | unsigned long flags; |
| 866 | |
| 867 | if (serial_paranoia_check(info, tty->name, "rs_put_char")) |
| 868 | return; |
| 869 | |
| 870 | if (!tty || !info->xmit.buf) |
| 871 | return; |
| 872 | |
| 873 | local_irq_save(flags); |
| 874 | if (CIRC_SPACE(info->xmit.head, |
| 875 | info->xmit.tail, |
| 876 | SERIAL_XMIT_SIZE) == 0) { |
| 877 | local_irq_restore(flags); |
| 878 | return; |
| 879 | } |
| 880 | |
| 881 | info->xmit.buf[info->xmit.head++] = ch; |
| 882 | info->xmit.head &= SERIAL_XMIT_SIZE-1; |
| 883 | local_irq_restore(flags); |
| 884 | } |
| 885 | |
| 886 | static void rs_flush_chars(struct tty_struct *tty) |
| 887 | { |
| 888 | struct async_struct *info = (struct async_struct *)tty->driver_data; |
| 889 | unsigned long flags; |
| 890 | |
| 891 | if (serial_paranoia_check(info, tty->name, "rs_flush_chars")) |
| 892 | return; |
| 893 | |
| 894 | if (info->xmit.head == info->xmit.tail |
| 895 | || tty->stopped |
| 896 | || tty->hw_stopped |
| 897 | || !info->xmit.buf) |
| 898 | return; |
| 899 | |
| 900 | local_irq_save(flags); |
| 901 | info->IER |= UART_IER_THRI; |
| 902 | custom.intena = IF_SETCLR | IF_TBE; |
| 903 | mb(); |
| 904 | /* set a pending Tx Interrupt, transmitter should restart now */ |
| 905 | custom.intreq = IF_SETCLR | IF_TBE; |
| 906 | mb(); |
| 907 | local_irq_restore(flags); |
| 908 | } |
| 909 | |
| 910 | static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count) |
| 911 | { |
| 912 | int c, ret = 0; |
| 913 | struct async_struct *info = (struct async_struct *)tty->driver_data; |
| 914 | unsigned long flags; |
| 915 | |
| 916 | if (serial_paranoia_check(info, tty->name, "rs_write")) |
| 917 | return 0; |
| 918 | |
| 919 | if (!tty || !info->xmit.buf || !tmp_buf) |
| 920 | return 0; |
| 921 | |
| 922 | local_save_flags(flags); |
| 923 | local_irq_disable(); |
| 924 | while (1) { |
| 925 | c = CIRC_SPACE_TO_END(info->xmit.head, |
| 926 | info->xmit.tail, |
| 927 | SERIAL_XMIT_SIZE); |
| 928 | if (count < c) |
| 929 | c = count; |
| 930 | if (c <= 0) { |
| 931 | break; |
| 932 | } |
| 933 | memcpy(info->xmit.buf + info->xmit.head, buf, c); |
| 934 | info->xmit.head = ((info->xmit.head + c) & |
| 935 | (SERIAL_XMIT_SIZE-1)); |
| 936 | buf += c; |
| 937 | count -= c; |
| 938 | ret += c; |
| 939 | } |
| 940 | local_irq_restore(flags); |
| 941 | |
| 942 | if (info->xmit.head != info->xmit.tail |
| 943 | && !tty->stopped |
| 944 | && !tty->hw_stopped |
| 945 | && !(info->IER & UART_IER_THRI)) { |
| 946 | info->IER |= UART_IER_THRI; |
| 947 | local_irq_disable(); |
| 948 | custom.intena = IF_SETCLR | IF_TBE; |
| 949 | mb(); |
| 950 | /* set a pending Tx Interrupt, transmitter should restart now */ |
| 951 | custom.intreq = IF_SETCLR | IF_TBE; |
| 952 | mb(); |
| 953 | local_irq_restore(flags); |
| 954 | } |
| 955 | return ret; |
| 956 | } |
| 957 | |
| 958 | static int rs_write_room(struct tty_struct *tty) |
| 959 | { |
| 960 | struct async_struct *info = (struct async_struct *)tty->driver_data; |
| 961 | |
| 962 | if (serial_paranoia_check(info, tty->name, "rs_write_room")) |
| 963 | return 0; |
| 964 | return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); |
| 965 | } |
| 966 | |
| 967 | static int rs_chars_in_buffer(struct tty_struct *tty) |
| 968 | { |
| 969 | struct async_struct *info = (struct async_struct *)tty->driver_data; |
| 970 | |
| 971 | if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer")) |
| 972 | return 0; |
| 973 | return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); |
| 974 | } |
| 975 | |
| 976 | static void rs_flush_buffer(struct tty_struct *tty) |
| 977 | { |
| 978 | struct async_struct *info = (struct async_struct *)tty->driver_data; |
| 979 | unsigned long flags; |
| 980 | |
| 981 | if (serial_paranoia_check(info, tty->name, "rs_flush_buffer")) |
| 982 | return; |
| 983 | local_irq_save(flags); |
| 984 | info->xmit.head = info->xmit.tail = 0; |
| 985 | local_irq_restore(flags); |
| 986 | wake_up_interruptible(&tty->write_wait); |
| 987 | tty_wakeup(tty); |
| 988 | } |
| 989 | |
| 990 | /* |
| 991 | * This function is used to send a high-priority XON/XOFF character to |
| 992 | * the device |
| 993 | */ |
| 994 | static void rs_send_xchar(struct tty_struct *tty, char ch) |
| 995 | { |
| 996 | struct async_struct *info = (struct async_struct *)tty->driver_data; |
| 997 | unsigned long flags; |
| 998 | |
| 999 | if (serial_paranoia_check(info, tty->name, "rs_send_char")) |
| 1000 | return; |
| 1001 | |
| 1002 | info->x_char = ch; |
| 1003 | if (ch) { |
| 1004 | /* Make sure transmit interrupts are on */ |
| 1005 | |
| 1006 | /* Check this ! */ |
| 1007 | local_irq_save(flags); |
| 1008 | if(!(custom.intenar & IF_TBE)) { |
| 1009 | custom.intena = IF_SETCLR | IF_TBE; |
| 1010 | mb(); |
| 1011 | /* set a pending Tx Interrupt, transmitter should restart now */ |
| 1012 | custom.intreq = IF_SETCLR | IF_TBE; |
| 1013 | mb(); |
| 1014 | } |
| 1015 | local_irq_restore(flags); |
| 1016 | |
| 1017 | info->IER |= UART_IER_THRI; |
| 1018 | } |
| 1019 | } |
| 1020 | |
| 1021 | /* |
| 1022 | * ------------------------------------------------------------ |
| 1023 | * rs_throttle() |
| 1024 | * |
| 1025 | * This routine is called by the upper-layer tty layer to signal that |
| 1026 | * incoming characters should be throttled. |
| 1027 | * ------------------------------------------------------------ |
| 1028 | */ |
| 1029 | static void rs_throttle(struct tty_struct * tty) |
| 1030 | { |
| 1031 | struct async_struct *info = (struct async_struct *)tty->driver_data; |
| 1032 | unsigned long flags; |
| 1033 | #ifdef SERIAL_DEBUG_THROTTLE |
| 1034 | char buf[64]; |
| 1035 | |
| 1036 | printk("throttle %s: %d....\n", tty_name(tty, buf), |
| 1037 | tty->ldisc.chars_in_buffer(tty)); |
| 1038 | #endif |
| 1039 | |
| 1040 | if (serial_paranoia_check(info, tty->name, "rs_throttle")) |
| 1041 | return; |
| 1042 | |
| 1043 | if (I_IXOFF(tty)) |
| 1044 | rs_send_xchar(tty, STOP_CHAR(tty)); |
| 1045 | |
| 1046 | if (tty->termios->c_cflag & CRTSCTS) |
| 1047 | info->MCR &= ~SER_RTS; |
| 1048 | |
| 1049 | local_irq_save(flags); |
| 1050 | rtsdtr_ctrl(info->MCR); |
| 1051 | local_irq_restore(flags); |
| 1052 | } |
| 1053 | |
| 1054 | static void rs_unthrottle(struct tty_struct * tty) |
| 1055 | { |
| 1056 | struct async_struct *info = (struct async_struct *)tty->driver_data; |
| 1057 | unsigned long flags; |
| 1058 | #ifdef SERIAL_DEBUG_THROTTLE |
| 1059 | char buf[64]; |
| 1060 | |
| 1061 | printk("unthrottle %s: %d....\n", tty_name(tty, buf), |
| 1062 | tty->ldisc.chars_in_buffer(tty)); |
| 1063 | #endif |
| 1064 | |
| 1065 | if (serial_paranoia_check(info, tty->name, "rs_unthrottle")) |
| 1066 | return; |
| 1067 | |
| 1068 | if (I_IXOFF(tty)) { |
| 1069 | if (info->x_char) |
| 1070 | info->x_char = 0; |
| 1071 | else |
| 1072 | rs_send_xchar(tty, START_CHAR(tty)); |
| 1073 | } |
| 1074 | if (tty->termios->c_cflag & CRTSCTS) |
| 1075 | info->MCR |= SER_RTS; |
| 1076 | local_irq_save(flags); |
| 1077 | rtsdtr_ctrl(info->MCR); |
| 1078 | local_irq_restore(flags); |
| 1079 | } |
| 1080 | |
| 1081 | /* |
| 1082 | * ------------------------------------------------------------ |
| 1083 | * rs_ioctl() and friends |
| 1084 | * ------------------------------------------------------------ |
| 1085 | */ |
| 1086 | |
| 1087 | static int get_serial_info(struct async_struct * info, |
| 1088 | struct serial_struct * retinfo) |
| 1089 | { |
| 1090 | struct serial_struct tmp; |
| 1091 | struct serial_state *state = info->state; |
| 1092 | |
| 1093 | if (!retinfo) |
| 1094 | return -EFAULT; |
| 1095 | memset(&tmp, 0, sizeof(tmp)); |
| 1096 | tmp.type = state->type; |
| 1097 | tmp.line = state->line; |
| 1098 | tmp.port = state->port; |
| 1099 | tmp.irq = state->irq; |
| 1100 | tmp.flags = state->flags; |
| 1101 | tmp.xmit_fifo_size = state->xmit_fifo_size; |
| 1102 | tmp.baud_base = state->baud_base; |
| 1103 | tmp.close_delay = state->close_delay; |
| 1104 | tmp.closing_wait = state->closing_wait; |
| 1105 | tmp.custom_divisor = state->custom_divisor; |
| 1106 | if (copy_to_user(retinfo,&tmp,sizeof(*retinfo))) |
| 1107 | return -EFAULT; |
| 1108 | return 0; |
| 1109 | } |
| 1110 | |
| 1111 | static int set_serial_info(struct async_struct * info, |
| 1112 | struct serial_struct * new_info) |
| 1113 | { |
| 1114 | struct serial_struct new_serial; |
| 1115 | struct serial_state old_state, *state; |
| 1116 | unsigned int change_irq,change_port; |
| 1117 | int retval = 0; |
| 1118 | |
| 1119 | if (copy_from_user(&new_serial,new_info,sizeof(new_serial))) |
| 1120 | return -EFAULT; |
| 1121 | state = info->state; |
| 1122 | old_state = *state; |
| 1123 | |
| 1124 | change_irq = new_serial.irq != state->irq; |
| 1125 | change_port = (new_serial.port != state->port); |
| 1126 | if(change_irq || change_port || (new_serial.xmit_fifo_size != state->xmit_fifo_size)) |
| 1127 | return -EINVAL; |
| 1128 | |
| 1129 | if (!serial_isroot()) { |
| 1130 | if ((new_serial.baud_base != state->baud_base) || |
| 1131 | (new_serial.close_delay != state->close_delay) || |
| 1132 | (new_serial.xmit_fifo_size != state->xmit_fifo_size) || |
| 1133 | ((new_serial.flags & ~ASYNC_USR_MASK) != |
| 1134 | (state->flags & ~ASYNC_USR_MASK))) |
| 1135 | return -EPERM; |
| 1136 | state->flags = ((state->flags & ~ASYNC_USR_MASK) | |
| 1137 | (new_serial.flags & ASYNC_USR_MASK)); |
| 1138 | info->flags = ((info->flags & ~ASYNC_USR_MASK) | |
| 1139 | (new_serial.flags & ASYNC_USR_MASK)); |
| 1140 | state->custom_divisor = new_serial.custom_divisor; |
| 1141 | goto check_and_exit; |
| 1142 | } |
| 1143 | |
| 1144 | if (new_serial.baud_base < 9600) |
| 1145 | return -EINVAL; |
| 1146 | |
| 1147 | /* |
| 1148 | * OK, past this point, all the error checking has been done. |
| 1149 | * At this point, we start making changes..... |
| 1150 | */ |
| 1151 | |
| 1152 | state->baud_base = new_serial.baud_base; |
| 1153 | state->flags = ((state->flags & ~ASYNC_FLAGS) | |
| 1154 | (new_serial.flags & ASYNC_FLAGS)); |
| 1155 | info->flags = ((state->flags & ~ASYNC_INTERNAL_FLAGS) | |
| 1156 | (info->flags & ASYNC_INTERNAL_FLAGS)); |
| 1157 | state->custom_divisor = new_serial.custom_divisor; |
| 1158 | state->close_delay = new_serial.close_delay * HZ/100; |
| 1159 | state->closing_wait = new_serial.closing_wait * HZ/100; |
| 1160 | info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0; |
| 1161 | |
| 1162 | check_and_exit: |
| 1163 | if (info->flags & ASYNC_INITIALIZED) { |
| 1164 | if (((old_state.flags & ASYNC_SPD_MASK) != |
| 1165 | (state->flags & ASYNC_SPD_MASK)) || |
| 1166 | (old_state.custom_divisor != state->custom_divisor)) { |
| 1167 | if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI) |
| 1168 | info->tty->alt_speed = 57600; |
| 1169 | if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI) |
| 1170 | info->tty->alt_speed = 115200; |
| 1171 | if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI) |
| 1172 | info->tty->alt_speed = 230400; |
| 1173 | if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP) |
| 1174 | info->tty->alt_speed = 460800; |
| 1175 | change_speed(info, NULL); |
| 1176 | } |
| 1177 | } else |
| 1178 | retval = startup(info); |
| 1179 | return retval; |
| 1180 | } |
| 1181 | |
| 1182 | |
| 1183 | /* |
| 1184 | * get_lsr_info - get line status register info |
| 1185 | * |
| 1186 | * Purpose: Let user call ioctl() to get info when the UART physically |
| 1187 | * is emptied. On bus types like RS485, the transmitter must |
| 1188 | * release the bus after transmitting. This must be done when |
| 1189 | * the transmit shift register is empty, not be done when the |
| 1190 | * transmit holding register is empty. This functionality |
| 1191 | * allows an RS485 driver to be written in user space. |
| 1192 | */ |
| 1193 | static int get_lsr_info(struct async_struct * info, unsigned int *value) |
| 1194 | { |
| 1195 | unsigned char status; |
| 1196 | unsigned int result; |
| 1197 | unsigned long flags; |
| 1198 | |
| 1199 | local_irq_save(flags); |
| 1200 | status = custom.serdatr; |
| 1201 | mb(); |
| 1202 | local_irq_restore(flags); |
| 1203 | result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0); |
| 1204 | if (copy_to_user(value, &result, sizeof(int))) |
| 1205 | return -EFAULT; |
| 1206 | return 0; |
| 1207 | } |
| 1208 | |
| 1209 | |
| 1210 | static int rs_tiocmget(struct tty_struct *tty, struct file *file) |
| 1211 | { |
| 1212 | struct async_struct * info = (struct async_struct *)tty->driver_data; |
| 1213 | unsigned char control, status; |
| 1214 | unsigned long flags; |
| 1215 | |
| 1216 | if (serial_paranoia_check(info, tty->name, "rs_ioctl")) |
| 1217 | return -ENODEV; |
| 1218 | if (tty->flags & (1 << TTY_IO_ERROR)) |
| 1219 | return -EIO; |
| 1220 | |
| 1221 | control = info->MCR; |
| 1222 | local_irq_save(flags); |
| 1223 | status = ciab.pra; |
| 1224 | local_irq_restore(flags); |
| 1225 | return ((control & SER_RTS) ? TIOCM_RTS : 0) |
| 1226 | | ((control & SER_DTR) ? TIOCM_DTR : 0) |
| 1227 | | (!(status & SER_DCD) ? TIOCM_CAR : 0) |
| 1228 | | (!(status & SER_DSR) ? TIOCM_DSR : 0) |
| 1229 | | (!(status & SER_CTS) ? TIOCM_CTS : 0); |
| 1230 | } |
| 1231 | |
| 1232 | static int rs_tiocmset(struct tty_struct *tty, struct file *file, |
| 1233 | unsigned int set, unsigned int clear) |
| 1234 | { |
| 1235 | struct async_struct * info = (struct async_struct *)tty->driver_data; |
| 1236 | unsigned long flags; |
| 1237 | |
| 1238 | if (serial_paranoia_check(info, tty->name, "rs_ioctl")) |
| 1239 | return -ENODEV; |
| 1240 | if (tty->flags & (1 << TTY_IO_ERROR)) |
| 1241 | return -EIO; |
| 1242 | |
| 1243 | local_irq_save(flags); |
| 1244 | if (set & TIOCM_RTS) |
| 1245 | info->MCR |= SER_RTS; |
| 1246 | if (set & TIOCM_DTR) |
| 1247 | info->MCR |= SER_DTR; |
| 1248 | if (clear & TIOCM_RTS) |
| 1249 | info->MCR &= ~SER_RTS; |
| 1250 | if (clear & TIOCM_DTR) |
| 1251 | info->MCR &= ~SER_DTR; |
| 1252 | rtsdtr_ctrl(info->MCR); |
| 1253 | local_irq_restore(flags); |
| 1254 | return 0; |
| 1255 | } |
| 1256 | |
| 1257 | /* |
| 1258 | * rs_break() --- routine which turns the break handling on or off |
| 1259 | */ |
| 1260 | static void rs_break(struct tty_struct *tty, int break_state) |
| 1261 | { |
| 1262 | struct async_struct * info = (struct async_struct *)tty->driver_data; |
| 1263 | unsigned long flags; |
| 1264 | |
| 1265 | if (serial_paranoia_check(info, tty->name, "rs_break")) |
| 1266 | return; |
| 1267 | |
| 1268 | local_irq_save(flags); |
| 1269 | if (break_state == -1) |
| 1270 | custom.adkcon = AC_SETCLR | AC_UARTBRK; |
| 1271 | else |
| 1272 | custom.adkcon = AC_UARTBRK; |
| 1273 | mb(); |
| 1274 | local_irq_restore(flags); |
| 1275 | } |
| 1276 | |
| 1277 | |
| 1278 | static int rs_ioctl(struct tty_struct *tty, struct file * file, |
| 1279 | unsigned int cmd, unsigned long arg) |
| 1280 | { |
| 1281 | struct async_struct * info = (struct async_struct *)tty->driver_data; |
| 1282 | struct async_icount cprev, cnow; /* kernel counter temps */ |
| 1283 | struct serial_icounter_struct icount; |
| 1284 | unsigned long flags; |
| 1285 | |
| 1286 | if (serial_paranoia_check(info, tty->name, "rs_ioctl")) |
| 1287 | return -ENODEV; |
| 1288 | |
| 1289 | if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) && |
| 1290 | (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) && |
| 1291 | (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) { |
| 1292 | if (tty->flags & (1 << TTY_IO_ERROR)) |
| 1293 | return -EIO; |
| 1294 | } |
| 1295 | |
| 1296 | switch (cmd) { |
| 1297 | case TIOCGSERIAL: |
| 1298 | return get_serial_info(info, |
| 1299 | (struct serial_struct *) arg); |
| 1300 | case TIOCSSERIAL: |
| 1301 | return set_serial_info(info, |
| 1302 | (struct serial_struct *) arg); |
| 1303 | case TIOCSERCONFIG: |
| 1304 | return 0; |
| 1305 | |
| 1306 | case TIOCSERGETLSR: /* Get line status register */ |
| 1307 | return get_lsr_info(info, (unsigned int *) arg); |
| 1308 | |
| 1309 | case TIOCSERGSTRUCT: |
| 1310 | if (copy_to_user((struct async_struct *) arg, |
| 1311 | info, sizeof(struct async_struct))) |
| 1312 | return -EFAULT; |
| 1313 | return 0; |
| 1314 | |
| 1315 | /* |
| 1316 | * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change |
| 1317 | * - mask passed in arg for lines of interest |
| 1318 | * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) |
| 1319 | * Caller should use TIOCGICOUNT to see which one it was |
| 1320 | */ |
| 1321 | case TIOCMIWAIT: |
| 1322 | local_irq_save(flags); |
| 1323 | /* note the counters on entry */ |
| 1324 | cprev = info->state->icount; |
| 1325 | local_irq_restore(flags); |
| 1326 | while (1) { |
| 1327 | interruptible_sleep_on(&info->delta_msr_wait); |
| 1328 | /* see if a signal did it */ |
| 1329 | if (signal_pending(current)) |
| 1330 | return -ERESTARTSYS; |
| 1331 | local_irq_save(flags); |
| 1332 | cnow = info->state->icount; /* atomic copy */ |
| 1333 | local_irq_restore(flags); |
| 1334 | if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr && |
| 1335 | cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) |
| 1336 | return -EIO; /* no change => error */ |
| 1337 | if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || |
| 1338 | ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || |
| 1339 | ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || |
| 1340 | ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) { |
| 1341 | return 0; |
| 1342 | } |
| 1343 | cprev = cnow; |
| 1344 | } |
| 1345 | /* NOTREACHED */ |
| 1346 | |
| 1347 | /* |
| 1348 | * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) |
| 1349 | * Return: write counters to the user passed counter struct |
| 1350 | * NB: both 1->0 and 0->1 transitions are counted except for |
| 1351 | * RI where only 0->1 is counted. |
| 1352 | */ |
| 1353 | case TIOCGICOUNT: |
| 1354 | local_irq_save(flags); |
| 1355 | cnow = info->state->icount; |
| 1356 | local_irq_restore(flags); |
| 1357 | icount.cts = cnow.cts; |
| 1358 | icount.dsr = cnow.dsr; |
| 1359 | icount.rng = cnow.rng; |
| 1360 | icount.dcd = cnow.dcd; |
| 1361 | icount.rx = cnow.rx; |
| 1362 | icount.tx = cnow.tx; |
| 1363 | icount.frame = cnow.frame; |
| 1364 | icount.overrun = cnow.overrun; |
| 1365 | icount.parity = cnow.parity; |
| 1366 | icount.brk = cnow.brk; |
| 1367 | icount.buf_overrun = cnow.buf_overrun; |
| 1368 | |
| 1369 | if (copy_to_user((void *)arg, &icount, sizeof(icount))) |
| 1370 | return -EFAULT; |
| 1371 | return 0; |
| 1372 | case TIOCSERGWILD: |
| 1373 | case TIOCSERSWILD: |
| 1374 | /* "setserial -W" is called in Debian boot */ |
| 1375 | printk ("TIOCSER?WILD ioctl obsolete, ignored.\n"); |
| 1376 | return 0; |
| 1377 | |
| 1378 | default: |
| 1379 | return -ENOIOCTLCMD; |
| 1380 | } |
| 1381 | return 0; |
| 1382 | } |
| 1383 | |
| 1384 | static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios) |
| 1385 | { |
| 1386 | struct async_struct *info = (struct async_struct *)tty->driver_data; |
| 1387 | unsigned long flags; |
| 1388 | unsigned int cflag = tty->termios->c_cflag; |
| 1389 | |
| 1390 | if ( (cflag == old_termios->c_cflag) |
| 1391 | && ( RELEVANT_IFLAG(tty->termios->c_iflag) |
| 1392 | == RELEVANT_IFLAG(old_termios->c_iflag))) |
| 1393 | return; |
| 1394 | |
| 1395 | change_speed(info, old_termios); |
| 1396 | |
| 1397 | /* Handle transition to B0 status */ |
| 1398 | if ((old_termios->c_cflag & CBAUD) && |
| 1399 | !(cflag & CBAUD)) { |
| 1400 | info->MCR &= ~(SER_DTR|SER_RTS); |
| 1401 | local_irq_save(flags); |
| 1402 | rtsdtr_ctrl(info->MCR); |
| 1403 | local_irq_restore(flags); |
| 1404 | } |
| 1405 | |
| 1406 | /* Handle transition away from B0 status */ |
| 1407 | if (!(old_termios->c_cflag & CBAUD) && |
| 1408 | (cflag & CBAUD)) { |
| 1409 | info->MCR |= SER_DTR; |
| 1410 | if (!(tty->termios->c_cflag & CRTSCTS) || |
| 1411 | !test_bit(TTY_THROTTLED, &tty->flags)) { |
| 1412 | info->MCR |= SER_RTS; |
| 1413 | } |
| 1414 | local_irq_save(flags); |
| 1415 | rtsdtr_ctrl(info->MCR); |
| 1416 | local_irq_restore(flags); |
| 1417 | } |
| 1418 | |
| 1419 | /* Handle turning off CRTSCTS */ |
| 1420 | if ((old_termios->c_cflag & CRTSCTS) && |
| 1421 | !(tty->termios->c_cflag & CRTSCTS)) { |
| 1422 | tty->hw_stopped = 0; |
| 1423 | rs_start(tty); |
| 1424 | } |
| 1425 | |
| 1426 | #if 0 |
| 1427 | /* |
| 1428 | * No need to wake up processes in open wait, since they |
| 1429 | * sample the CLOCAL flag once, and don't recheck it. |
| 1430 | * XXX It's not clear whether the current behavior is correct |
| 1431 | * or not. Hence, this may change..... |
| 1432 | */ |
| 1433 | if (!(old_termios->c_cflag & CLOCAL) && |
| 1434 | (tty->termios->c_cflag & CLOCAL)) |
| 1435 | wake_up_interruptible(&info->open_wait); |
| 1436 | #endif |
| 1437 | } |
| 1438 | |
| 1439 | /* |
| 1440 | * ------------------------------------------------------------ |
| 1441 | * rs_close() |
| 1442 | * |
| 1443 | * This routine is called when the serial port gets closed. First, we |
| 1444 | * wait for the last remaining data to be sent. Then, we unlink its |
| 1445 | * async structure from the interrupt chain if necessary, and we free |
| 1446 | * that IRQ if nothing is left in the chain. |
| 1447 | * ------------------------------------------------------------ |
| 1448 | */ |
| 1449 | static void rs_close(struct tty_struct *tty, struct file * filp) |
| 1450 | { |
| 1451 | struct async_struct * info = (struct async_struct *)tty->driver_data; |
| 1452 | struct serial_state *state; |
| 1453 | unsigned long flags; |
| 1454 | |
| 1455 | if (!info || serial_paranoia_check(info, tty->name, "rs_close")) |
| 1456 | return; |
| 1457 | |
| 1458 | state = info->state; |
| 1459 | |
| 1460 | local_irq_save(flags); |
| 1461 | |
| 1462 | if (tty_hung_up_p(filp)) { |
| 1463 | DBG_CNT("before DEC-hung"); |
| 1464 | local_irq_restore(flags); |
| 1465 | return; |
| 1466 | } |
| 1467 | |
| 1468 | #ifdef SERIAL_DEBUG_OPEN |
| 1469 | printk("rs_close ttys%d, count = %d\n", info->line, state->count); |
| 1470 | #endif |
| 1471 | if ((tty->count == 1) && (state->count != 1)) { |
| 1472 | /* |
| 1473 | * Uh, oh. tty->count is 1, which means that the tty |
| 1474 | * structure will be freed. state->count should always |
| 1475 | * be one in these conditions. If it's greater than |
| 1476 | * one, we've got real problems, since it means the |
| 1477 | * serial port won't be shutdown. |
| 1478 | */ |
| 1479 | printk("rs_close: bad serial port count; tty->count is 1, " |
| 1480 | "state->count is %d\n", state->count); |
| 1481 | state->count = 1; |
| 1482 | } |
| 1483 | if (--state->count < 0) { |
| 1484 | printk("rs_close: bad serial port count for ttys%d: %d\n", |
| 1485 | info->line, state->count); |
| 1486 | state->count = 0; |
| 1487 | } |
| 1488 | if (state->count) { |
| 1489 | DBG_CNT("before DEC-2"); |
| 1490 | local_irq_restore(flags); |
| 1491 | return; |
| 1492 | } |
| 1493 | info->flags |= ASYNC_CLOSING; |
| 1494 | /* |
| 1495 | * Now we wait for the transmit buffer to clear; and we notify |
| 1496 | * the line discipline to only process XON/XOFF characters. |
| 1497 | */ |
| 1498 | tty->closing = 1; |
| 1499 | if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE) |
| 1500 | tty_wait_until_sent(tty, info->closing_wait); |
| 1501 | /* |
| 1502 | * At this point we stop accepting input. To do this, we |
| 1503 | * disable the receive line status interrupts, and tell the |
| 1504 | * interrupt driver to stop checking the data ready bit in the |
| 1505 | * line status register. |
| 1506 | */ |
| 1507 | info->read_status_mask &= ~UART_LSR_DR; |
| 1508 | if (info->flags & ASYNC_INITIALIZED) { |
| 1509 | /* disable receive interrupts */ |
| 1510 | custom.intena = IF_RBF; |
| 1511 | mb(); |
| 1512 | /* clear any pending receive interrupt */ |
| 1513 | custom.intreq = IF_RBF; |
| 1514 | mb(); |
| 1515 | |
| 1516 | /* |
| 1517 | * Before we drop DTR, make sure the UART transmitter |
| 1518 | * has completely drained; this is especially |
| 1519 | * important if there is a transmit FIFO! |
| 1520 | */ |
| 1521 | rs_wait_until_sent(tty, info->timeout); |
| 1522 | } |
| 1523 | shutdown(info); |
| 1524 | if (tty->driver->flush_buffer) |
| 1525 | tty->driver->flush_buffer(tty); |
| 1526 | |
| 1527 | tty_ldisc_flush(tty); |
| 1528 | tty->closing = 0; |
| 1529 | info->event = 0; |
| 1530 | info->tty = NULL; |
| 1531 | if (info->blocked_open) { |
| 1532 | if (info->close_delay) { |
| 1533 | msleep_interruptible(jiffies_to_msecs(info->close_delay)); |
| 1534 | } |
| 1535 | wake_up_interruptible(&info->open_wait); |
| 1536 | } |
| 1537 | info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING); |
| 1538 | wake_up_interruptible(&info->close_wait); |
| 1539 | local_irq_restore(flags); |
| 1540 | } |
| 1541 | |
| 1542 | /* |
| 1543 | * rs_wait_until_sent() --- wait until the transmitter is empty |
| 1544 | */ |
| 1545 | static void rs_wait_until_sent(struct tty_struct *tty, int timeout) |
| 1546 | { |
| 1547 | struct async_struct * info = (struct async_struct *)tty->driver_data; |
| 1548 | unsigned long orig_jiffies, char_time; |
| 1549 | int lsr; |
| 1550 | |
| 1551 | if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent")) |
| 1552 | return; |
| 1553 | |
| 1554 | if (info->xmit_fifo_size == 0) |
| 1555 | return; /* Just in case.... */ |
| 1556 | |
| 1557 | orig_jiffies = jiffies; |
| 1558 | /* |
| 1559 | * Set the check interval to be 1/5 of the estimated time to |
| 1560 | * send a single character, and make it at least 1. The check |
| 1561 | * interval should also be less than the timeout. |
| 1562 | * |
| 1563 | * Note: we have to use pretty tight timings here to satisfy |
| 1564 | * the NIST-PCTS. |
| 1565 | */ |
| 1566 | char_time = (info->timeout - HZ/50) / info->xmit_fifo_size; |
| 1567 | char_time = char_time / 5; |
| 1568 | if (char_time == 0) |
| 1569 | char_time = 1; |
| 1570 | if (timeout) |
| 1571 | char_time = min_t(unsigned long, char_time, timeout); |
| 1572 | /* |
| 1573 | * If the transmitter hasn't cleared in twice the approximate |
| 1574 | * amount of time to send the entire FIFO, it probably won't |
| 1575 | * ever clear. This assumes the UART isn't doing flow |
| 1576 | * control, which is currently the case. Hence, if it ever |
| 1577 | * takes longer than info->timeout, this is probably due to a |
| 1578 | * UART bug of some kind. So, we clamp the timeout parameter at |
| 1579 | * 2*info->timeout. |
| 1580 | */ |
| 1581 | if (!timeout || timeout > 2*info->timeout) |
| 1582 | timeout = 2*info->timeout; |
| 1583 | #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT |
| 1584 | printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time); |
| 1585 | printk("jiff=%lu...", jiffies); |
| 1586 | #endif |
| 1587 | while(!((lsr = custom.serdatr) & SDR_TSRE)) { |
| 1588 | #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT |
| 1589 | printk("serdatr = %d (jiff=%lu)...", lsr, jiffies); |
| 1590 | #endif |
| 1591 | msleep_interruptible(jiffies_to_msecs(char_time)); |
| 1592 | if (signal_pending(current)) |
| 1593 | break; |
| 1594 | if (timeout && time_after(jiffies, orig_jiffies + timeout)) |
| 1595 | break; |
| 1596 | } |
| 1597 | current->state = TASK_RUNNING; |
| 1598 | #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT |
| 1599 | printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies); |
| 1600 | #endif |
| 1601 | } |
| 1602 | |
| 1603 | /* |
| 1604 | * rs_hangup() --- called by tty_hangup() when a hangup is signaled. |
| 1605 | */ |
| 1606 | static void rs_hangup(struct tty_struct *tty) |
| 1607 | { |
| 1608 | struct async_struct * info = (struct async_struct *)tty->driver_data; |
| 1609 | struct serial_state *state = info->state; |
| 1610 | |
| 1611 | if (serial_paranoia_check(info, tty->name, "rs_hangup")) |
| 1612 | return; |
| 1613 | |
| 1614 | state = info->state; |
| 1615 | |
| 1616 | rs_flush_buffer(tty); |
| 1617 | shutdown(info); |
| 1618 | info->event = 0; |
| 1619 | state->count = 0; |
| 1620 | info->flags &= ~ASYNC_NORMAL_ACTIVE; |
| 1621 | info->tty = NULL; |
| 1622 | wake_up_interruptible(&info->open_wait); |
| 1623 | } |
| 1624 | |
| 1625 | /* |
| 1626 | * ------------------------------------------------------------ |
| 1627 | * rs_open() and friends |
| 1628 | * ------------------------------------------------------------ |
| 1629 | */ |
| 1630 | static int block_til_ready(struct tty_struct *tty, struct file * filp, |
| 1631 | struct async_struct *info) |
| 1632 | { |
| 1633 | #ifdef DECLARE_WAITQUEUE |
| 1634 | DECLARE_WAITQUEUE(wait, current); |
| 1635 | #else |
| 1636 | struct wait_queue wait = { current, NULL }; |
| 1637 | #endif |
| 1638 | struct serial_state *state = info->state; |
| 1639 | int retval; |
| 1640 | int do_clocal = 0, extra_count = 0; |
| 1641 | unsigned long flags; |
| 1642 | |
| 1643 | /* |
| 1644 | * If the device is in the middle of being closed, then block |
| 1645 | * until it's done, and then try again. |
| 1646 | */ |
| 1647 | if (tty_hung_up_p(filp) || |
| 1648 | (info->flags & ASYNC_CLOSING)) { |
| 1649 | if (info->flags & ASYNC_CLOSING) |
| 1650 | interruptible_sleep_on(&info->close_wait); |
| 1651 | #ifdef SERIAL_DO_RESTART |
| 1652 | return ((info->flags & ASYNC_HUP_NOTIFY) ? |
| 1653 | -EAGAIN : -ERESTARTSYS); |
| 1654 | #else |
| 1655 | return -EAGAIN; |
| 1656 | #endif |
| 1657 | } |
| 1658 | |
| 1659 | /* |
| 1660 | * If non-blocking mode is set, or the port is not enabled, |
| 1661 | * then make the check up front and then exit. |
| 1662 | */ |
| 1663 | if ((filp->f_flags & O_NONBLOCK) || |
| 1664 | (tty->flags & (1 << TTY_IO_ERROR))) { |
| 1665 | info->flags |= ASYNC_NORMAL_ACTIVE; |
| 1666 | return 0; |
| 1667 | } |
| 1668 | |
| 1669 | if (tty->termios->c_cflag & CLOCAL) |
| 1670 | do_clocal = 1; |
| 1671 | |
| 1672 | /* |
| 1673 | * Block waiting for the carrier detect and the line to become |
| 1674 | * free (i.e., not in use by the callout). While we are in |
| 1675 | * this loop, state->count is dropped by one, so that |
| 1676 | * rs_close() knows when to free things. We restore it upon |
| 1677 | * exit, either normal or abnormal. |
| 1678 | */ |
| 1679 | retval = 0; |
| 1680 | add_wait_queue(&info->open_wait, &wait); |
| 1681 | #ifdef SERIAL_DEBUG_OPEN |
| 1682 | printk("block_til_ready before block: ttys%d, count = %d\n", |
| 1683 | state->line, state->count); |
| 1684 | #endif |
| 1685 | local_irq_save(flags); |
| 1686 | if (!tty_hung_up_p(filp)) { |
| 1687 | extra_count = 1; |
| 1688 | state->count--; |
| 1689 | } |
| 1690 | local_irq_restore(flags); |
| 1691 | info->blocked_open++; |
| 1692 | while (1) { |
| 1693 | local_irq_save(flags); |
| 1694 | if (tty->termios->c_cflag & CBAUD) |
| 1695 | rtsdtr_ctrl(SER_DTR|SER_RTS); |
| 1696 | local_irq_restore(flags); |
| 1697 | set_current_state(TASK_INTERRUPTIBLE); |
| 1698 | if (tty_hung_up_p(filp) || |
| 1699 | !(info->flags & ASYNC_INITIALIZED)) { |
| 1700 | #ifdef SERIAL_DO_RESTART |
| 1701 | if (info->flags & ASYNC_HUP_NOTIFY) |
| 1702 | retval = -EAGAIN; |
| 1703 | else |
| 1704 | retval = -ERESTARTSYS; |
| 1705 | #else |
| 1706 | retval = -EAGAIN; |
| 1707 | #endif |
| 1708 | break; |
| 1709 | } |
| 1710 | if (!(info->flags & ASYNC_CLOSING) && |
| 1711 | (do_clocal || (!(ciab.pra & SER_DCD)) )) |
| 1712 | break; |
| 1713 | if (signal_pending(current)) { |
| 1714 | retval = -ERESTARTSYS; |
| 1715 | break; |
| 1716 | } |
| 1717 | #ifdef SERIAL_DEBUG_OPEN |
| 1718 | printk("block_til_ready blocking: ttys%d, count = %d\n", |
| 1719 | info->line, state->count); |
| 1720 | #endif |
| 1721 | schedule(); |
| 1722 | } |
| 1723 | current->state = TASK_RUNNING; |
| 1724 | remove_wait_queue(&info->open_wait, &wait); |
| 1725 | if (extra_count) |
| 1726 | state->count++; |
| 1727 | info->blocked_open--; |
| 1728 | #ifdef SERIAL_DEBUG_OPEN |
| 1729 | printk("block_til_ready after blocking: ttys%d, count = %d\n", |
| 1730 | info->line, state->count); |
| 1731 | #endif |
| 1732 | if (retval) |
| 1733 | return retval; |
| 1734 | info->flags |= ASYNC_NORMAL_ACTIVE; |
| 1735 | return 0; |
| 1736 | } |
| 1737 | |
| 1738 | static int get_async_struct(int line, struct async_struct **ret_info) |
| 1739 | { |
| 1740 | struct async_struct *info; |
| 1741 | struct serial_state *sstate; |
| 1742 | |
| 1743 | sstate = rs_table + line; |
| 1744 | sstate->count++; |
| 1745 | if (sstate->info) { |
| 1746 | *ret_info = sstate->info; |
| 1747 | return 0; |
| 1748 | } |
| 1749 | info = kmalloc(sizeof(struct async_struct), GFP_KERNEL); |
| 1750 | if (!info) { |
| 1751 | sstate->count--; |
| 1752 | return -ENOMEM; |
| 1753 | } |
| 1754 | memset(info, 0, sizeof(struct async_struct)); |
| 1755 | #ifdef DECLARE_WAITQUEUE |
| 1756 | init_waitqueue_head(&info->open_wait); |
| 1757 | init_waitqueue_head(&info->close_wait); |
| 1758 | init_waitqueue_head(&info->delta_msr_wait); |
| 1759 | #endif |
| 1760 | info->magic = SERIAL_MAGIC; |
| 1761 | info->port = sstate->port; |
| 1762 | info->flags = sstate->flags; |
| 1763 | info->xmit_fifo_size = sstate->xmit_fifo_size; |
| 1764 | info->line = line; |
| 1765 | tasklet_init(&info->tlet, do_softint, (unsigned long)info); |
| 1766 | info->state = sstate; |
| 1767 | if (sstate->info) { |
| 1768 | kfree(info); |
| 1769 | *ret_info = sstate->info; |
| 1770 | return 0; |
| 1771 | } |
| 1772 | *ret_info = sstate->info = info; |
| 1773 | return 0; |
| 1774 | } |
| 1775 | |
| 1776 | /* |
| 1777 | * This routine is called whenever a serial port is opened. It |
| 1778 | * enables interrupts for a serial port, linking in its async structure into |
| 1779 | * the IRQ chain. It also performs the serial-specific |
| 1780 | * initialization for the tty structure. |
| 1781 | */ |
| 1782 | static int rs_open(struct tty_struct *tty, struct file * filp) |
| 1783 | { |
| 1784 | struct async_struct *info; |
| 1785 | int retval, line; |
| 1786 | unsigned long page; |
| 1787 | |
| 1788 | line = tty->index; |
| 1789 | if ((line < 0) || (line >= NR_PORTS)) { |
| 1790 | return -ENODEV; |
| 1791 | } |
| 1792 | retval = get_async_struct(line, &info); |
| 1793 | if (retval) { |
| 1794 | return retval; |
| 1795 | } |
| 1796 | tty->driver_data = info; |
| 1797 | info->tty = tty; |
| 1798 | if (serial_paranoia_check(info, tty->name, "rs_open")) |
| 1799 | return -ENODEV; |
| 1800 | |
| 1801 | #ifdef SERIAL_DEBUG_OPEN |
| 1802 | printk("rs_open %s, count = %d\n", tty->name, info->state->count); |
| 1803 | #endif |
| 1804 | info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0; |
| 1805 | |
| 1806 | if (!tmp_buf) { |
| 1807 | page = get_zeroed_page(GFP_KERNEL); |
| 1808 | if (!page) { |
| 1809 | return -ENOMEM; |
| 1810 | } |
| 1811 | if (tmp_buf) |
| 1812 | free_page(page); |
| 1813 | else |
| 1814 | tmp_buf = (unsigned char *) page; |
| 1815 | } |
| 1816 | |
| 1817 | /* |
| 1818 | * If the port is the middle of closing, bail out now |
| 1819 | */ |
| 1820 | if (tty_hung_up_p(filp) || |
| 1821 | (info->flags & ASYNC_CLOSING)) { |
| 1822 | if (info->flags & ASYNC_CLOSING) |
| 1823 | interruptible_sleep_on(&info->close_wait); |
| 1824 | #ifdef SERIAL_DO_RESTART |
| 1825 | return ((info->flags & ASYNC_HUP_NOTIFY) ? |
| 1826 | -EAGAIN : -ERESTARTSYS); |
| 1827 | #else |
| 1828 | return -EAGAIN; |
| 1829 | #endif |
| 1830 | } |
| 1831 | |
| 1832 | /* |
| 1833 | * Start up serial port |
| 1834 | */ |
| 1835 | retval = startup(info); |
| 1836 | if (retval) { |
| 1837 | return retval; |
| 1838 | } |
| 1839 | |
| 1840 | retval = block_til_ready(tty, filp, info); |
| 1841 | if (retval) { |
| 1842 | #ifdef SERIAL_DEBUG_OPEN |
| 1843 | printk("rs_open returning after block_til_ready with %d\n", |
| 1844 | retval); |
| 1845 | #endif |
| 1846 | return retval; |
| 1847 | } |
| 1848 | |
| 1849 | #ifdef SERIAL_DEBUG_OPEN |
| 1850 | printk("rs_open %s successful...", tty->name); |
| 1851 | #endif |
| 1852 | return 0; |
| 1853 | } |
| 1854 | |
| 1855 | /* |
| 1856 | * /proc fs routines.... |
| 1857 | */ |
| 1858 | |
| 1859 | static inline int line_info(char *buf, struct serial_state *state) |
| 1860 | { |
| 1861 | struct async_struct *info = state->info, scr_info; |
| 1862 | char stat_buf[30], control, status; |
| 1863 | int ret; |
| 1864 | unsigned long flags; |
| 1865 | |
| 1866 | ret = sprintf(buf, "%d: uart:amiga_builtin",state->line); |
| 1867 | |
| 1868 | /* |
| 1869 | * Figure out the current RS-232 lines |
| 1870 | */ |
| 1871 | if (!info) { |
| 1872 | info = &scr_info; /* This is just for serial_{in,out} */ |
| 1873 | |
| 1874 | info->magic = SERIAL_MAGIC; |
| 1875 | info->flags = state->flags; |
| 1876 | info->quot = 0; |
| 1877 | info->tty = NULL; |
| 1878 | } |
| 1879 | local_irq_save(flags); |
| 1880 | status = ciab.pra; |
| 1881 | control = info ? info->MCR : status; |
| 1882 | local_irq_restore(flags); |
| 1883 | |
| 1884 | stat_buf[0] = 0; |
| 1885 | stat_buf[1] = 0; |
| 1886 | if(!(control & SER_RTS)) |
| 1887 | strcat(stat_buf, "|RTS"); |
| 1888 | if(!(status & SER_CTS)) |
| 1889 | strcat(stat_buf, "|CTS"); |
| 1890 | if(!(control & SER_DTR)) |
| 1891 | strcat(stat_buf, "|DTR"); |
| 1892 | if(!(status & SER_DSR)) |
| 1893 | strcat(stat_buf, "|DSR"); |
| 1894 | if(!(status & SER_DCD)) |
| 1895 | strcat(stat_buf, "|CD"); |
| 1896 | |
| 1897 | if (info->quot) { |
| 1898 | ret += sprintf(buf+ret, " baud:%d", |
| 1899 | state->baud_base / info->quot); |
| 1900 | } |
| 1901 | |
| 1902 | ret += sprintf(buf+ret, " tx:%d rx:%d", |
| 1903 | state->icount.tx, state->icount.rx); |
| 1904 | |
| 1905 | if (state->icount.frame) |
| 1906 | ret += sprintf(buf+ret, " fe:%d", state->icount.frame); |
| 1907 | |
| 1908 | if (state->icount.parity) |
| 1909 | ret += sprintf(buf+ret, " pe:%d", state->icount.parity); |
| 1910 | |
| 1911 | if (state->icount.brk) |
| 1912 | ret += sprintf(buf+ret, " brk:%d", state->icount.brk); |
| 1913 | |
| 1914 | if (state->icount.overrun) |
| 1915 | ret += sprintf(buf+ret, " oe:%d", state->icount.overrun); |
| 1916 | |
| 1917 | /* |
| 1918 | * Last thing is the RS-232 status lines |
| 1919 | */ |
| 1920 | ret += sprintf(buf+ret, " %s\n", stat_buf+1); |
| 1921 | return ret; |
| 1922 | } |
| 1923 | |
| 1924 | static int rs_read_proc(char *page, char **start, off_t off, int count, |
| 1925 | int *eof, void *data) |
| 1926 | { |
| 1927 | int len = 0, l; |
| 1928 | off_t begin = 0; |
| 1929 | |
| 1930 | len += sprintf(page, "serinfo:1.0 driver:%s\n", serial_version); |
| 1931 | l = line_info(page + len, &rs_table[0]); |
| 1932 | len += l; |
| 1933 | if (len+begin > off+count) |
| 1934 | goto done; |
| 1935 | if (len+begin < off) { |
| 1936 | begin += len; |
| 1937 | len = 0; |
| 1938 | } |
| 1939 | *eof = 1; |
| 1940 | done: |
| 1941 | if (off >= len+begin) |
| 1942 | return 0; |
| 1943 | *start = page + (off-begin); |
| 1944 | return ((count < begin+len-off) ? count : begin+len-off); |
| 1945 | } |
| 1946 | |
| 1947 | /* |
| 1948 | * --------------------------------------------------------------------- |
| 1949 | * rs_init() and friends |
| 1950 | * |
| 1951 | * rs_init() is called at boot-time to initialize the serial driver. |
| 1952 | * --------------------------------------------------------------------- |
| 1953 | */ |
| 1954 | |
| 1955 | /* |
| 1956 | * This routine prints out the appropriate serial driver version |
| 1957 | * number, and identifies which options were configured into this |
| 1958 | * driver. |
| 1959 | */ |
| 1960 | static _INLINE_ void show_serial_version(void) |
| 1961 | { |
| 1962 | printk(KERN_INFO "%s version %s\n", serial_name, serial_version); |
| 1963 | } |
| 1964 | |
| 1965 | |
| 1966 | int register_serial(struct serial_struct *req); |
| 1967 | void unregister_serial(int line); |
| 1968 | |
| 1969 | |
| 1970 | static struct tty_operations serial_ops = { |
| 1971 | .open = rs_open, |
| 1972 | .close = rs_close, |
| 1973 | .write = rs_write, |
| 1974 | .put_char = rs_put_char, |
| 1975 | .flush_chars = rs_flush_chars, |
| 1976 | .write_room = rs_write_room, |
| 1977 | .chars_in_buffer = rs_chars_in_buffer, |
| 1978 | .flush_buffer = rs_flush_buffer, |
| 1979 | .ioctl = rs_ioctl, |
| 1980 | .throttle = rs_throttle, |
| 1981 | .unthrottle = rs_unthrottle, |
| 1982 | .set_termios = rs_set_termios, |
| 1983 | .stop = rs_stop, |
| 1984 | .start = rs_start, |
| 1985 | .hangup = rs_hangup, |
| 1986 | .break_ctl = rs_break, |
| 1987 | .send_xchar = rs_send_xchar, |
| 1988 | .wait_until_sent = rs_wait_until_sent, |
| 1989 | .read_proc = rs_read_proc, |
| 1990 | .tiocmget = rs_tiocmget, |
| 1991 | .tiocmset = rs_tiocmset, |
| 1992 | }; |
| 1993 | |
| 1994 | /* |
| 1995 | * The serial driver boot-time initialization code! |
| 1996 | */ |
| 1997 | static int __init rs_init(void) |
| 1998 | { |
| 1999 | unsigned long flags; |
| 2000 | struct serial_state * state; |
| 2001 | |
| 2002 | if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(AMI_SERIAL)) |
| 2003 | return -ENODEV; |
| 2004 | |
| 2005 | serial_driver = alloc_tty_driver(1); |
| 2006 | if (!serial_driver) |
| 2007 | return -ENOMEM; |
| 2008 | |
| 2009 | /* |
| 2010 | * We request SERDAT and SERPER only, because the serial registers are |
| 2011 | * too spreaded over the custom register space |
| 2012 | */ |
| 2013 | if (!request_mem_region(CUSTOM_PHYSADDR+0x30, 4, "amiserial [Paula]")) |
| 2014 | return -EBUSY; |
| 2015 | |
| 2016 | IRQ_ports = NULL; |
| 2017 | |
| 2018 | show_serial_version(); |
| 2019 | |
| 2020 | /* Initialize the tty_driver structure */ |
| 2021 | |
| 2022 | serial_driver->owner = THIS_MODULE; |
| 2023 | serial_driver->driver_name = "amiserial"; |
| 2024 | serial_driver->name = "ttyS"; |
| 2025 | serial_driver->major = TTY_MAJOR; |
| 2026 | serial_driver->minor_start = 64; |
| 2027 | serial_driver->type = TTY_DRIVER_TYPE_SERIAL; |
| 2028 | serial_driver->subtype = SERIAL_TYPE_NORMAL; |
| 2029 | serial_driver->init_termios = tty_std_termios; |
| 2030 | serial_driver->init_termios.c_cflag = |
| 2031 | B9600 | CS8 | CREAD | HUPCL | CLOCAL; |
| 2032 | serial_driver->flags = TTY_DRIVER_REAL_RAW; |
| 2033 | tty_set_operations(serial_driver, &serial_ops); |
| 2034 | |
| 2035 | if (tty_register_driver(serial_driver)) |
| 2036 | panic("Couldn't register serial driver\n"); |
| 2037 | |
| 2038 | state = rs_table; |
| 2039 | state->magic = SSTATE_MAGIC; |
| 2040 | state->port = (int)&custom.serdatr; /* Just to give it a value */ |
| 2041 | state->line = 0; |
| 2042 | state->custom_divisor = 0; |
| 2043 | state->close_delay = 5*HZ/10; |
| 2044 | state->closing_wait = 30*HZ; |
| 2045 | state->icount.cts = state->icount.dsr = |
| 2046 | state->icount.rng = state->icount.dcd = 0; |
| 2047 | state->icount.rx = state->icount.tx = 0; |
| 2048 | state->icount.frame = state->icount.parity = 0; |
| 2049 | state->icount.overrun = state->icount.brk = 0; |
| 2050 | /* |
| 2051 | if(state->port && check_region(state->port,REGION_LENGTH(state))) |
| 2052 | continue; |
| 2053 | */ |
| 2054 | |
| 2055 | printk(KERN_INFO "ttyS%d is the amiga builtin serial port\n", |
| 2056 | state->line); |
| 2057 | |
| 2058 | /* Hardware set up */ |
| 2059 | |
| 2060 | state->baud_base = amiga_colorclock; |
| 2061 | state->xmit_fifo_size = 1; |
| 2062 | |
| 2063 | local_irq_save(flags); |
| 2064 | |
| 2065 | /* set ISRs, and then disable the rx interrupts */ |
| 2066 | request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state); |
| 2067 | request_irq(IRQ_AMIGA_RBF, ser_rx_int, SA_INTERRUPT, "serial RX", state); |
| 2068 | |
| 2069 | /* turn off Rx and Tx interrupts */ |
| 2070 | custom.intena = IF_RBF | IF_TBE; |
| 2071 | mb(); |
| 2072 | |
| 2073 | /* clear any pending interrupt */ |
| 2074 | custom.intreq = IF_RBF | IF_TBE; |
| 2075 | mb(); |
| 2076 | |
| 2077 | local_irq_restore(flags); |
| 2078 | |
| 2079 | /* |
| 2080 | * set the appropriate directions for the modem control flags, |
| 2081 | * and clear RTS and DTR |
| 2082 | */ |
| 2083 | ciab.ddra |= (SER_DTR | SER_RTS); /* outputs */ |
| 2084 | ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR); /* inputs */ |
| 2085 | |
| 2086 | return 0; |
| 2087 | } |
| 2088 | |
| 2089 | static __exit void rs_exit(void) |
| 2090 | { |
| 2091 | int error; |
| 2092 | struct async_struct *info = rs_table[0].info; |
| 2093 | |
| 2094 | /* printk("Unloading %s: version %s\n", serial_name, serial_version); */ |
| 2095 | tasklet_kill(&info->tlet); |
| 2096 | if ((error = tty_unregister_driver(serial_driver))) |
| 2097 | printk("SERIAL: failed to unregister serial driver (%d)\n", |
| 2098 | error); |
| 2099 | put_tty_driver(serial_driver); |
| 2100 | |
| 2101 | if (info) { |
| 2102 | rs_table[0].info = NULL; |
| 2103 | kfree(info); |
| 2104 | } |
| 2105 | |
| 2106 | if (tmp_buf) { |
| 2107 | free_page((unsigned long) tmp_buf); |
| 2108 | tmp_buf = NULL; |
| 2109 | } |
| 2110 | |
| 2111 | release_mem_region(CUSTOM_PHYSADDR+0x30, 4); |
| 2112 | } |
| 2113 | |
| 2114 | module_init(rs_init) |
| 2115 | module_exit(rs_exit) |
| 2116 | |
| 2117 | |
| 2118 | /* |
| 2119 | * ------------------------------------------------------------ |
| 2120 | * Serial console driver |
| 2121 | * ------------------------------------------------------------ |
| 2122 | */ |
| 2123 | #ifdef CONFIG_SERIAL_CONSOLE |
| 2124 | |
| 2125 | static void amiga_serial_putc(char c) |
| 2126 | { |
| 2127 | custom.serdat = (unsigned char)c | 0x100; |
| 2128 | while (!(custom.serdatr & 0x2000)) |
| 2129 | barrier(); |
| 2130 | } |
| 2131 | |
| 2132 | /* |
| 2133 | * Print a string to the serial port trying not to disturb |
| 2134 | * any possible real use of the port... |
| 2135 | * |
| 2136 | * The console must be locked when we get here. |
| 2137 | */ |
| 2138 | static void serial_console_write(struct console *co, const char *s, |
| 2139 | unsigned count) |
| 2140 | { |
| 2141 | unsigned short intena = custom.intenar; |
| 2142 | |
| 2143 | custom.intena = IF_TBE; |
| 2144 | |
| 2145 | while (count--) { |
| 2146 | if (*s == '\n') |
| 2147 | amiga_serial_putc('\r'); |
| 2148 | amiga_serial_putc(*s++); |
| 2149 | } |
| 2150 | |
| 2151 | custom.intena = IF_SETCLR | (intena & IF_TBE); |
| 2152 | } |
| 2153 | |
| 2154 | static struct tty_driver *serial_console_device(struct console *c, int *index) |
| 2155 | { |
| 2156 | *index = 0; |
| 2157 | return serial_driver; |
| 2158 | } |
| 2159 | |
| 2160 | static struct console sercons = { |
| 2161 | .name = "ttyS", |
| 2162 | .write = serial_console_write, |
| 2163 | .device = serial_console_device, |
| 2164 | .flags = CON_PRINTBUFFER, |
| 2165 | .index = -1, |
| 2166 | }; |
| 2167 | |
| 2168 | /* |
| 2169 | * Register console. |
| 2170 | */ |
| 2171 | static int __init amiserial_console_init(void) |
| 2172 | { |
| 2173 | register_console(&sercons); |
| 2174 | return 0; |
| 2175 | } |
| 2176 | console_initcall(amiserial_console_init); |
| 2177 | #endif |
| 2178 | |
| 2179 | MODULE_LICENSE("GPL"); |