Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /************************************************************************ |
| 2 | * Copyright 2003 Digi International (www.digi.com) |
| 3 | * |
| 4 | * Copyright (C) 2004 IBM Corporation. All rights reserved. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2, or (at your option) |
| 9 | * any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED; without even the |
| 13 | * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR |
| 14 | * PURPOSE. See the GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 59 * Temple Place - Suite 330, Boston, |
| 19 | * MA 02111-1307, USA. |
| 20 | * |
| 21 | * Contact Information: |
| 22 | * Scott H Kilau <Scott_Kilau@digi.com> |
| 23 | * Wendy Xiong <wendyx@us.ltcfwd.linux.ibm.com> |
| 24 | * |
| 25 | ***********************************************************************/ |
| 26 | #include <linux/tty.h> |
| 27 | #include <linux/tty_flip.h> |
| 28 | #include <linux/serial_reg.h> |
| 29 | #include <linux/delay.h> /* For udelay */ |
| 30 | #include <linux/pci.h> |
| 31 | |
| 32 | #include "jsm.h" |
| 33 | |
Adrian Bunk | 408b664 | 2005-05-01 08:59:29 -0700 | [diff] [blame] | 34 | static void jsm_carrier(struct jsm_channel *ch); |
| 35 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | static inline int jsm_get_mstat(struct jsm_channel *ch) |
| 37 | { |
| 38 | unsigned char mstat; |
| 39 | unsigned result; |
| 40 | |
| 41 | jsm_printk(IOCTL, INFO, &ch->ch_bd->pci_dev, "start\n"); |
| 42 | |
| 43 | mstat = (ch->ch_mostat | ch->ch_mistat); |
| 44 | |
| 45 | result = 0; |
| 46 | |
| 47 | if (mstat & UART_MCR_DTR) |
| 48 | result |= TIOCM_DTR; |
| 49 | if (mstat & UART_MCR_RTS) |
| 50 | result |= TIOCM_RTS; |
| 51 | if (mstat & UART_MSR_CTS) |
| 52 | result |= TIOCM_CTS; |
| 53 | if (mstat & UART_MSR_DSR) |
| 54 | result |= TIOCM_DSR; |
| 55 | if (mstat & UART_MSR_RI) |
| 56 | result |= TIOCM_RI; |
| 57 | if (mstat & UART_MSR_DCD) |
| 58 | result |= TIOCM_CD; |
| 59 | |
| 60 | jsm_printk(IOCTL, INFO, &ch->ch_bd->pci_dev, "finish\n"); |
| 61 | return result; |
| 62 | } |
| 63 | |
| 64 | static unsigned int jsm_tty_tx_empty(struct uart_port *port) |
| 65 | { |
| 66 | return TIOCSER_TEMT; |
| 67 | } |
| 68 | |
| 69 | /* |
| 70 | * Return modem signals to ld. |
| 71 | */ |
| 72 | static unsigned int jsm_tty_get_mctrl(struct uart_port *port) |
| 73 | { |
| 74 | int result; |
| 75 | struct jsm_channel *channel = (struct jsm_channel *)port; |
| 76 | |
| 77 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "start\n"); |
| 78 | |
| 79 | result = jsm_get_mstat(channel); |
| 80 | |
| 81 | if (result < 0) |
| 82 | return -ENXIO; |
| 83 | |
| 84 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "finish\n"); |
| 85 | |
| 86 | return result; |
| 87 | } |
| 88 | |
| 89 | /* |
| 90 | * jsm_set_modem_info() |
| 91 | * |
| 92 | * Set modem signals, called by ld. |
| 93 | */ |
| 94 | static void jsm_tty_set_mctrl(struct uart_port *port, unsigned int mctrl) |
| 95 | { |
| 96 | struct jsm_channel *channel = (struct jsm_channel *)port; |
| 97 | |
| 98 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "start\n"); |
| 99 | |
| 100 | if (mctrl & TIOCM_RTS) |
| 101 | channel->ch_mostat |= UART_MCR_RTS; |
| 102 | else |
| 103 | channel->ch_mostat &= ~UART_MCR_RTS; |
| 104 | |
| 105 | if (mctrl & TIOCM_DTR) |
| 106 | channel->ch_mostat |= UART_MCR_DTR; |
| 107 | else |
| 108 | channel->ch_mostat &= ~UART_MCR_DTR; |
| 109 | |
| 110 | channel->ch_bd->bd_ops->assert_modem_signals(channel); |
| 111 | |
| 112 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "finish\n"); |
| 113 | udelay(10); |
| 114 | } |
| 115 | |
Russell King | b129a8c | 2005-08-31 10:12:14 +0100 | [diff] [blame^] | 116 | static void jsm_tty_start_tx(struct uart_port *port) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | { |
| 118 | struct jsm_channel *channel = (struct jsm_channel *)port; |
| 119 | |
| 120 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "start\n"); |
| 121 | |
| 122 | channel->ch_flags &= ~(CH_STOP); |
| 123 | jsm_tty_write(port); |
| 124 | |
| 125 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "finish\n"); |
| 126 | } |
| 127 | |
Russell King | b129a8c | 2005-08-31 10:12:14 +0100 | [diff] [blame^] | 128 | static void jsm_tty_stop_tx(struct uart_port *port) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | { |
| 130 | struct jsm_channel *channel = (struct jsm_channel *)port; |
| 131 | |
| 132 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "start\n"); |
| 133 | |
| 134 | channel->ch_flags |= (CH_STOP); |
| 135 | |
| 136 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "finish\n"); |
| 137 | } |
| 138 | |
| 139 | static void jsm_tty_send_xchar(struct uart_port *port, char ch) |
| 140 | { |
| 141 | unsigned long lock_flags; |
| 142 | struct jsm_channel *channel = (struct jsm_channel *)port; |
| 143 | |
| 144 | spin_lock_irqsave(&port->lock, lock_flags); |
| 145 | if (ch == port->info->tty->termios->c_cc[VSTART]) |
| 146 | channel->ch_bd->bd_ops->send_start_character(channel); |
| 147 | |
| 148 | if (ch == port->info->tty->termios->c_cc[VSTOP]) |
| 149 | channel->ch_bd->bd_ops->send_stop_character(channel); |
| 150 | spin_unlock_irqrestore(&port->lock, lock_flags); |
| 151 | } |
| 152 | |
| 153 | static void jsm_tty_stop_rx(struct uart_port *port) |
| 154 | { |
| 155 | struct jsm_channel *channel = (struct jsm_channel *)port; |
| 156 | |
| 157 | channel->ch_bd->bd_ops->disable_receiver(channel); |
| 158 | } |
| 159 | |
| 160 | static void jsm_tty_break(struct uart_port *port, int break_state) |
| 161 | { |
| 162 | unsigned long lock_flags; |
| 163 | struct jsm_channel *channel = (struct jsm_channel *)port; |
| 164 | |
| 165 | spin_lock_irqsave(&port->lock, lock_flags); |
| 166 | if (break_state == -1) |
| 167 | channel->ch_bd->bd_ops->send_break(channel); |
| 168 | else |
| 169 | channel->ch_bd->bd_ops->clear_break(channel, 0); |
| 170 | |
| 171 | spin_unlock_irqrestore(&port->lock, lock_flags); |
| 172 | } |
| 173 | |
| 174 | static int jsm_tty_open(struct uart_port *port) |
| 175 | { |
| 176 | struct jsm_board *brd; |
| 177 | int rc = 0; |
| 178 | struct jsm_channel *channel = (struct jsm_channel *)port; |
| 179 | |
| 180 | /* Get board pointer from our array of majors we have allocated */ |
| 181 | brd = channel->ch_bd; |
| 182 | |
| 183 | /* |
| 184 | * Allocate channel buffers for read/write/error. |
| 185 | * Set flag, so we don't get trounced on. |
| 186 | */ |
| 187 | channel->ch_flags |= (CH_OPENING); |
| 188 | |
| 189 | /* Drop locks, as malloc with GFP_KERNEL can sleep */ |
| 190 | |
| 191 | if (!channel->ch_rqueue) { |
| 192 | channel->ch_rqueue = (u8 *) kmalloc(RQUEUESIZE, GFP_KERNEL); |
| 193 | if (!channel->ch_rqueue) { |
| 194 | jsm_printk(INIT, ERR, &channel->ch_bd->pci_dev, |
| 195 | "unable to allocate read queue buf"); |
| 196 | return -ENOMEM; |
| 197 | } |
| 198 | memset(channel->ch_rqueue, 0, RQUEUESIZE); |
| 199 | } |
| 200 | if (!channel->ch_equeue) { |
| 201 | channel->ch_equeue = (u8 *) kmalloc(EQUEUESIZE, GFP_KERNEL); |
| 202 | if (!channel->ch_equeue) { |
| 203 | jsm_printk(INIT, ERR, &channel->ch_bd->pci_dev, |
| 204 | "unable to allocate error queue buf"); |
| 205 | return -ENOMEM; |
| 206 | } |
| 207 | memset(channel->ch_equeue, 0, EQUEUESIZE); |
| 208 | } |
| 209 | if (!channel->ch_wqueue) { |
| 210 | channel->ch_wqueue = (u8 *) kmalloc(WQUEUESIZE, GFP_KERNEL); |
| 211 | if (!channel->ch_wqueue) { |
| 212 | jsm_printk(INIT, ERR, &channel->ch_bd->pci_dev, |
| 213 | "unable to allocate write queue buf"); |
| 214 | return -ENOMEM; |
| 215 | } |
| 216 | memset(channel->ch_wqueue, 0, WQUEUESIZE); |
| 217 | } |
| 218 | |
| 219 | channel->ch_flags &= ~(CH_OPENING); |
| 220 | /* |
| 221 | * Initialize if neither terminal is open. |
| 222 | */ |
| 223 | jsm_printk(OPEN, INFO, &channel->ch_bd->pci_dev, |
| 224 | "jsm_open: initializing channel in open...\n"); |
| 225 | |
| 226 | /* |
| 227 | * Flush input queues. |
| 228 | */ |
| 229 | channel->ch_r_head = channel->ch_r_tail = 0; |
| 230 | channel->ch_e_head = channel->ch_e_tail = 0; |
| 231 | channel->ch_w_head = channel->ch_w_tail = 0; |
| 232 | |
| 233 | brd->bd_ops->flush_uart_write(channel); |
| 234 | brd->bd_ops->flush_uart_read(channel); |
| 235 | |
| 236 | channel->ch_flags = 0; |
| 237 | channel->ch_cached_lsr = 0; |
| 238 | channel->ch_stops_sent = 0; |
| 239 | |
| 240 | channel->ch_c_cflag = port->info->tty->termios->c_cflag; |
| 241 | channel->ch_c_iflag = port->info->tty->termios->c_iflag; |
| 242 | channel->ch_c_oflag = port->info->tty->termios->c_oflag; |
| 243 | channel->ch_c_lflag = port->info->tty->termios->c_lflag; |
| 244 | channel->ch_startc = port->info->tty->termios->c_cc[VSTART]; |
| 245 | channel->ch_stopc = port->info->tty->termios->c_cc[VSTOP]; |
| 246 | |
| 247 | /* Tell UART to init itself */ |
| 248 | brd->bd_ops->uart_init(channel); |
| 249 | |
| 250 | /* |
| 251 | * Run param in case we changed anything |
| 252 | */ |
| 253 | brd->bd_ops->param(channel); |
| 254 | |
| 255 | jsm_carrier(channel); |
| 256 | |
| 257 | channel->ch_open_count++; |
| 258 | |
| 259 | jsm_printk(OPEN, INFO, &channel->ch_bd->pci_dev, "finish\n"); |
| 260 | return rc; |
| 261 | } |
| 262 | |
| 263 | static void jsm_tty_close(struct uart_port *port) |
| 264 | { |
| 265 | struct jsm_board *bd; |
| 266 | struct termios *ts; |
| 267 | struct jsm_channel *channel = (struct jsm_channel *)port; |
| 268 | |
| 269 | jsm_printk(CLOSE, INFO, &channel->ch_bd->pci_dev, "start\n"); |
| 270 | |
| 271 | bd = channel->ch_bd; |
| 272 | ts = channel->uart_port.info->tty->termios; |
| 273 | |
| 274 | channel->ch_flags &= ~(CH_STOPI); |
| 275 | |
| 276 | channel->ch_open_count--; |
| 277 | |
| 278 | /* |
| 279 | * If we have HUPCL set, lower DTR and RTS |
| 280 | */ |
| 281 | if (channel->ch_c_cflag & HUPCL) { |
| 282 | jsm_printk(CLOSE, INFO, &channel->ch_bd->pci_dev, |
| 283 | "Close. HUPCL set, dropping DTR/RTS\n"); |
| 284 | |
| 285 | /* Drop RTS/DTR */ |
| 286 | channel->ch_mostat &= ~(UART_MCR_DTR | UART_MCR_RTS); |
| 287 | bd->bd_ops->assert_modem_signals(channel); |
| 288 | } |
| 289 | |
| 290 | channel->ch_old_baud = 0; |
| 291 | |
| 292 | /* Turn off UART interrupts for this port */ |
| 293 | channel->ch_bd->bd_ops->uart_off(channel); |
| 294 | |
| 295 | jsm_printk(CLOSE, INFO, &channel->ch_bd->pci_dev, "finish\n"); |
| 296 | } |
| 297 | |
| 298 | static void jsm_tty_set_termios(struct uart_port *port, |
| 299 | struct termios *termios, |
| 300 | struct termios *old_termios) |
| 301 | { |
| 302 | unsigned long lock_flags; |
| 303 | struct jsm_channel *channel = (struct jsm_channel *)port; |
| 304 | |
| 305 | spin_lock_irqsave(&port->lock, lock_flags); |
| 306 | channel->ch_c_cflag = termios->c_cflag; |
| 307 | channel->ch_c_iflag = termios->c_iflag; |
| 308 | channel->ch_c_oflag = termios->c_oflag; |
| 309 | channel->ch_c_lflag = termios->c_lflag; |
| 310 | channel->ch_startc = termios->c_cc[VSTART]; |
| 311 | channel->ch_stopc = termios->c_cc[VSTOP]; |
| 312 | |
| 313 | channel->ch_bd->bd_ops->param(channel); |
| 314 | jsm_carrier(channel); |
| 315 | spin_unlock_irqrestore(&port->lock, lock_flags); |
| 316 | } |
| 317 | |
| 318 | static const char *jsm_tty_type(struct uart_port *port) |
| 319 | { |
| 320 | return "jsm"; |
| 321 | } |
| 322 | |
| 323 | static void jsm_tty_release_port(struct uart_port *port) |
| 324 | { |
| 325 | } |
| 326 | |
| 327 | static int jsm_tty_request_port(struct uart_port *port) |
| 328 | { |
| 329 | return 0; |
| 330 | } |
| 331 | |
| 332 | static void jsm_config_port(struct uart_port *port, int flags) |
| 333 | { |
| 334 | port->type = PORT_JSM; |
| 335 | } |
| 336 | |
| 337 | static struct uart_ops jsm_ops = { |
| 338 | .tx_empty = jsm_tty_tx_empty, |
| 339 | .set_mctrl = jsm_tty_set_mctrl, |
| 340 | .get_mctrl = jsm_tty_get_mctrl, |
| 341 | .stop_tx = jsm_tty_stop_tx, |
| 342 | .start_tx = jsm_tty_start_tx, |
| 343 | .send_xchar = jsm_tty_send_xchar, |
| 344 | .stop_rx = jsm_tty_stop_rx, |
| 345 | .break_ctl = jsm_tty_break, |
| 346 | .startup = jsm_tty_open, |
| 347 | .shutdown = jsm_tty_close, |
| 348 | .set_termios = jsm_tty_set_termios, |
| 349 | .type = jsm_tty_type, |
| 350 | .release_port = jsm_tty_release_port, |
| 351 | .request_port = jsm_tty_request_port, |
| 352 | .config_port = jsm_config_port, |
| 353 | }; |
| 354 | |
| 355 | /* |
| 356 | * jsm_tty_init() |
| 357 | * |
| 358 | * Init the tty subsystem. Called once per board after board has been |
| 359 | * downloaded and init'ed. |
| 360 | */ |
| 361 | int jsm_tty_init(struct jsm_board *brd) |
| 362 | { |
| 363 | int i; |
| 364 | void __iomem *vaddr; |
| 365 | struct jsm_channel *ch; |
| 366 | |
| 367 | if (!brd) |
| 368 | return -ENXIO; |
| 369 | |
| 370 | jsm_printk(INIT, INFO, &brd->pci_dev, "start\n"); |
| 371 | |
| 372 | /* |
| 373 | * Initialize board structure elements. |
| 374 | */ |
| 375 | |
| 376 | brd->nasync = brd->maxports; |
| 377 | |
| 378 | /* |
| 379 | * Allocate channel memory that might not have been allocated |
| 380 | * when the driver was first loaded. |
| 381 | */ |
| 382 | for (i = 0; i < brd->nasync; i++) { |
| 383 | if (!brd->channels[i]) { |
| 384 | |
| 385 | /* |
| 386 | * Okay to malloc with GFP_KERNEL, we are not at |
| 387 | * interrupt context, and there are no locks held. |
| 388 | */ |
| 389 | brd->channels[i] = kmalloc(sizeof(struct jsm_channel), GFP_KERNEL); |
| 390 | if (!brd->channels[i]) { |
| 391 | jsm_printk(CORE, ERR, &brd->pci_dev, |
| 392 | "%s:%d Unable to allocate memory for channel struct\n", |
| 393 | __FILE__, __LINE__); |
| 394 | } |
| 395 | memset(brd->channels[i], 0, sizeof(struct jsm_channel)); |
| 396 | } |
| 397 | } |
| 398 | |
| 399 | ch = brd->channels[0]; |
| 400 | vaddr = brd->re_map_membase; |
| 401 | |
| 402 | /* Set up channel variables */ |
| 403 | for (i = 0; i < brd->nasync; i++, ch = brd->channels[i]) { |
| 404 | |
| 405 | if (!brd->channels[i]) |
| 406 | continue; |
| 407 | |
| 408 | spin_lock_init(&ch->ch_lock); |
| 409 | |
| 410 | if (brd->bd_uart_offset == 0x200) |
| 411 | ch->ch_neo_uart = vaddr + (brd->bd_uart_offset * i); |
| 412 | |
| 413 | ch->ch_bd = brd; |
| 414 | ch->ch_portnum = i; |
| 415 | |
| 416 | /* .25 second delay */ |
| 417 | ch->ch_close_delay = 250; |
| 418 | |
| 419 | init_waitqueue_head(&ch->ch_flags_wait); |
| 420 | } |
| 421 | |
| 422 | jsm_printk(INIT, INFO, &brd->pci_dev, "finish\n"); |
| 423 | return 0; |
| 424 | } |
| 425 | |
| 426 | int jsm_uart_port_init(struct jsm_board *brd) |
| 427 | { |
| 428 | int i; |
| 429 | struct jsm_channel *ch; |
| 430 | |
| 431 | if (!brd) |
| 432 | return -ENXIO; |
| 433 | |
| 434 | jsm_printk(INIT, INFO, &brd->pci_dev, "start\n"); |
| 435 | |
| 436 | /* |
| 437 | * Initialize board structure elements. |
| 438 | */ |
| 439 | |
| 440 | brd->nasync = brd->maxports; |
| 441 | |
| 442 | /* Set up channel variables */ |
| 443 | for (i = 0; i < brd->nasync; i++, ch = brd->channels[i]) { |
| 444 | |
| 445 | if (!brd->channels[i]) |
| 446 | continue; |
| 447 | |
| 448 | brd->channels[i]->uart_port.irq = brd->irq; |
| 449 | brd->channels[i]->uart_port.type = PORT_JSM; |
| 450 | brd->channels[i]->uart_port.iotype = UPIO_MEM; |
| 451 | brd->channels[i]->uart_port.membase = brd->re_map_membase; |
| 452 | brd->channels[i]->uart_port.fifosize = 16; |
| 453 | brd->channels[i]->uart_port.ops = &jsm_ops; |
| 454 | brd->channels[i]->uart_port.line = brd->channels[i]->ch_portnum + brd->boardnum * 2; |
| 455 | if (uart_add_one_port (&jsm_uart_driver, &brd->channels[i]->uart_port)) |
| 456 | printk(KERN_INFO "Added device failed\n"); |
| 457 | else |
| 458 | printk(KERN_INFO "Added device \n"); |
| 459 | } |
| 460 | |
| 461 | jsm_printk(INIT, INFO, &brd->pci_dev, "finish\n"); |
| 462 | return 0; |
| 463 | } |
| 464 | |
| 465 | int jsm_remove_uart_port(struct jsm_board *brd) |
| 466 | { |
| 467 | int i; |
| 468 | struct jsm_channel *ch; |
| 469 | |
| 470 | if (!brd) |
| 471 | return -ENXIO; |
| 472 | |
| 473 | jsm_printk(INIT, INFO, &brd->pci_dev, "start\n"); |
| 474 | |
| 475 | /* |
| 476 | * Initialize board structure elements. |
| 477 | */ |
| 478 | |
| 479 | brd->nasync = brd->maxports; |
| 480 | |
| 481 | /* Set up channel variables */ |
| 482 | for (i = 0; i < brd->nasync; i++) { |
| 483 | |
| 484 | if (!brd->channels[i]) |
| 485 | continue; |
| 486 | |
| 487 | ch = brd->channels[i]; |
| 488 | |
| 489 | uart_remove_one_port(&jsm_uart_driver, &brd->channels[i]->uart_port); |
| 490 | } |
| 491 | |
| 492 | jsm_printk(INIT, INFO, &brd->pci_dev, "finish\n"); |
| 493 | return 0; |
| 494 | } |
| 495 | |
| 496 | void jsm_input(struct jsm_channel *ch) |
| 497 | { |
| 498 | struct jsm_board *bd; |
| 499 | struct tty_struct *tp; |
| 500 | u32 rmask; |
| 501 | u16 head; |
| 502 | u16 tail; |
| 503 | int data_len; |
| 504 | unsigned long lock_flags; |
| 505 | int flip_len; |
| 506 | int len = 0; |
| 507 | int n = 0; |
| 508 | char *buf = NULL; |
| 509 | char *buf2 = NULL; |
| 510 | int s = 0; |
| 511 | int i = 0; |
| 512 | |
| 513 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "start\n"); |
| 514 | |
| 515 | if (!ch) |
| 516 | return; |
| 517 | |
| 518 | tp = ch->uart_port.info->tty; |
| 519 | |
| 520 | bd = ch->ch_bd; |
| 521 | if(!bd) |
| 522 | return; |
| 523 | |
| 524 | spin_lock_irqsave(&ch->ch_lock, lock_flags); |
| 525 | |
| 526 | /* |
| 527 | *Figure the number of characters in the buffer. |
| 528 | *Exit immediately if none. |
| 529 | */ |
| 530 | |
| 531 | rmask = RQUEUEMASK; |
| 532 | |
| 533 | head = ch->ch_r_head & rmask; |
| 534 | tail = ch->ch_r_tail & rmask; |
| 535 | |
| 536 | data_len = (head - tail) & rmask; |
| 537 | if (data_len == 0) { |
| 538 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); |
| 539 | return; |
| 540 | } |
| 541 | |
| 542 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "start\n"); |
| 543 | |
| 544 | /* |
| 545 | *If the device is not open, or CREAD is off, flush |
| 546 | *input data and return immediately. |
| 547 | */ |
| 548 | if (!tp || |
| 549 | !(tp->termios->c_cflag & CREAD) ) { |
| 550 | |
| 551 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, |
| 552 | "input. dropping %d bytes on port %d...\n", data_len, ch->ch_portnum); |
| 553 | ch->ch_r_head = tail; |
| 554 | |
| 555 | /* Force queue flow control to be released, if needed */ |
| 556 | jsm_check_queue_flow_control(ch); |
| 557 | |
| 558 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); |
| 559 | return; |
| 560 | } |
| 561 | |
| 562 | /* |
| 563 | * If we are throttled, simply don't read any data. |
| 564 | */ |
| 565 | if (ch->ch_flags & CH_STOPI) { |
| 566 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); |
| 567 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, |
| 568 | "Port %d throttled, not reading any data. head: %x tail: %x\n", |
| 569 | ch->ch_portnum, head, tail); |
| 570 | return; |
| 571 | } |
| 572 | |
| 573 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "start 2\n"); |
| 574 | |
| 575 | /* |
| 576 | * If the rxbuf is empty and we are not throttled, put as much |
| 577 | * as we can directly into the linux TTY flip buffer. |
| 578 | * The jsm_rawreadok case takes advantage of carnal knowledge that |
| 579 | * the char_buf and the flag_buf are next to each other and |
| 580 | * are each of (2 * TTY_FLIPBUF_SIZE) size. |
| 581 | * |
| 582 | * NOTE: if(!tty->real_raw), the call to ldisc.receive_buf |
| 583 | *actually still uses the flag buffer, so you can't |
| 584 | *use it for input data |
| 585 | */ |
| 586 | if (jsm_rawreadok) { |
| 587 | if (tp->real_raw) |
| 588 | flip_len = MYFLIPLEN; |
| 589 | else |
| 590 | flip_len = 2 * TTY_FLIPBUF_SIZE; |
| 591 | } else |
| 592 | flip_len = TTY_FLIPBUF_SIZE - tp->flip.count; |
| 593 | |
| 594 | len = min(data_len, flip_len); |
| 595 | len = min(len, (N_TTY_BUF_SIZE - 1) - tp->read_cnt); |
| 596 | |
| 597 | if (len <= 0) { |
| 598 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); |
| 599 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "jsm_input 1\n"); |
| 600 | return; |
| 601 | } |
| 602 | |
| 603 | /* |
| 604 | * If we're bypassing flip buffers on rx, we can blast it |
| 605 | * right into the beginning of the buffer. |
| 606 | */ |
| 607 | if (jsm_rawreadok) { |
| 608 | if (tp->real_raw) { |
| 609 | if (ch->ch_flags & CH_FLIPBUF_IN_USE) { |
| 610 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, |
| 611 | "JSM - FLIPBUF in use. delaying input\n"); |
| 612 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); |
| 613 | return; |
| 614 | } |
| 615 | ch->ch_flags |= CH_FLIPBUF_IN_USE; |
| 616 | buf = ch->ch_bd->flipbuf; |
| 617 | buf2 = NULL; |
| 618 | } else { |
| 619 | buf = tp->flip.char_buf; |
| 620 | buf2 = tp->flip.flag_buf; |
| 621 | } |
| 622 | } else { |
| 623 | buf = tp->flip.char_buf_ptr; |
| 624 | buf2 = tp->flip.flag_buf_ptr; |
| 625 | } |
| 626 | |
| 627 | n = len; |
| 628 | |
| 629 | /* |
| 630 | * n now contains the most amount of data we can copy, |
| 631 | * bounded either by the flip buffer size or the amount |
| 632 | * of data the card actually has pending... |
| 633 | */ |
| 634 | while (n) { |
| 635 | s = ((head >= tail) ? head : RQUEUESIZE) - tail; |
| 636 | s = min(s, n); |
| 637 | |
| 638 | if (s <= 0) |
| 639 | break; |
| 640 | |
| 641 | memcpy(buf, ch->ch_rqueue + tail, s); |
| 642 | |
| 643 | /* buf2 is only set when port isn't raw */ |
| 644 | if (buf2) |
| 645 | memcpy(buf2, ch->ch_equeue + tail, s); |
| 646 | |
| 647 | tail += s; |
| 648 | buf += s; |
| 649 | if (buf2) |
| 650 | buf2 += s; |
| 651 | n -= s; |
| 652 | /* Flip queue if needed */ |
| 653 | tail &= rmask; |
| 654 | } |
| 655 | |
| 656 | /* |
| 657 | * In high performance mode, we don't have to update |
| 658 | * flag_buf or any of the counts or pointers into flip buf. |
| 659 | */ |
| 660 | if (!jsm_rawreadok) { |
| 661 | if (I_PARMRK(tp) || I_BRKINT(tp) || I_INPCK(tp)) { |
| 662 | for (i = 0; i < len; i++) { |
| 663 | /* |
| 664 | * Give the Linux ld the flags in the |
| 665 | * format it likes. |
| 666 | */ |
| 667 | if (tp->flip.flag_buf_ptr[i] & UART_LSR_BI) |
| 668 | tp->flip.flag_buf_ptr[i] = TTY_BREAK; |
| 669 | else if (tp->flip.flag_buf_ptr[i] & UART_LSR_PE) |
| 670 | tp->flip.flag_buf_ptr[i] = TTY_PARITY; |
| 671 | else if (tp->flip.flag_buf_ptr[i] & UART_LSR_FE) |
| 672 | tp->flip.flag_buf_ptr[i] = TTY_FRAME; |
| 673 | else |
| 674 | tp->flip.flag_buf_ptr[i] = TTY_NORMAL; |
| 675 | } |
| 676 | } else { |
| 677 | memset(tp->flip.flag_buf_ptr, 0, len); |
| 678 | } |
| 679 | |
| 680 | tp->flip.char_buf_ptr += len; |
| 681 | tp->flip.flag_buf_ptr += len; |
| 682 | tp->flip.count += len; |
| 683 | } |
| 684 | else if (!tp->real_raw) { |
| 685 | if (I_PARMRK(tp) || I_BRKINT(tp) || I_INPCK(tp)) { |
| 686 | for (i = 0; i < len; i++) { |
| 687 | /* |
| 688 | * Give the Linux ld the flags in the |
| 689 | * format it likes. |
| 690 | */ |
| 691 | if (tp->flip.flag_buf_ptr[i] & UART_LSR_BI) |
| 692 | tp->flip.flag_buf_ptr[i] = TTY_BREAK; |
| 693 | else if (tp->flip.flag_buf_ptr[i] & UART_LSR_PE) |
| 694 | tp->flip.flag_buf_ptr[i] = TTY_PARITY; |
| 695 | else if (tp->flip.flag_buf_ptr[i] & UART_LSR_FE) |
| 696 | tp->flip.flag_buf_ptr[i] = TTY_FRAME; |
| 697 | else |
| 698 | tp->flip.flag_buf_ptr[i] = TTY_NORMAL; |
| 699 | } |
| 700 | } else |
| 701 | memset(tp->flip.flag_buf, 0, len); |
| 702 | } |
| 703 | |
| 704 | /* |
| 705 | * If we're doing raw reads, jam it right into the |
| 706 | * line disc bypassing the flip buffers. |
| 707 | */ |
| 708 | if (jsm_rawreadok) { |
| 709 | if (tp->real_raw) { |
| 710 | ch->ch_r_tail = tail & rmask; |
| 711 | ch->ch_e_tail = tail & rmask; |
| 712 | |
| 713 | jsm_check_queue_flow_control(ch); |
| 714 | |
| 715 | /* !!! WE *MUST* LET GO OF ALL LOCKS BEFORE CALLING RECEIVE BUF !!! */ |
| 716 | |
| 717 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); |
| 718 | |
| 719 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, |
| 720 | "jsm_input. %d real_raw len:%d calling receive_buf for board %d\n", |
| 721 | __LINE__, len, ch->ch_bd->boardnum); |
| 722 | tp->ldisc.receive_buf(tp, ch->ch_bd->flipbuf, NULL, len); |
| 723 | |
| 724 | /* Allow use of channel flip buffer again */ |
| 725 | spin_lock_irqsave(&ch->ch_lock, lock_flags); |
| 726 | ch->ch_flags &= ~CH_FLIPBUF_IN_USE; |
| 727 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); |
| 728 | |
| 729 | } else { |
| 730 | ch->ch_r_tail = tail & rmask; |
| 731 | ch->ch_e_tail = tail & rmask; |
| 732 | |
| 733 | jsm_check_queue_flow_control(ch); |
| 734 | |
| 735 | /* !!! WE *MUST* LET GO OF ALL LOCKS BEFORE CALLING RECEIVE BUF !!! */ |
| 736 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); |
| 737 | |
| 738 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, |
| 739 | "jsm_input. %d not real_raw len:%d calling receive_buf for board %d\n", |
| 740 | __LINE__, len, ch->ch_bd->boardnum); |
| 741 | |
| 742 | tp->ldisc.receive_buf(tp, tp->flip.char_buf, tp->flip.flag_buf, len); |
| 743 | } |
| 744 | } else { |
| 745 | ch->ch_r_tail = tail & rmask; |
| 746 | ch->ch_e_tail = tail & rmask; |
| 747 | |
| 748 | jsm_check_queue_flow_control(ch); |
| 749 | |
| 750 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); |
| 751 | |
| 752 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, |
| 753 | "jsm_input. %d not jsm_read raw okay scheduling flip\n", __LINE__); |
| 754 | tty_schedule_flip(tp); |
| 755 | } |
| 756 | |
| 757 | jsm_printk(IOCTL, INFO, &ch->ch_bd->pci_dev, "finish\n"); |
| 758 | } |
| 759 | |
Adrian Bunk | 408b664 | 2005-05-01 08:59:29 -0700 | [diff] [blame] | 760 | static void jsm_carrier(struct jsm_channel *ch) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 761 | { |
| 762 | struct jsm_board *bd; |
| 763 | |
| 764 | int virt_carrier = 0; |
| 765 | int phys_carrier = 0; |
| 766 | |
| 767 | jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev, "start\n"); |
| 768 | if (!ch) |
| 769 | return; |
| 770 | |
| 771 | bd = ch->ch_bd; |
| 772 | |
| 773 | if (!bd) |
| 774 | return; |
| 775 | |
| 776 | if (ch->ch_mistat & UART_MSR_DCD) { |
| 777 | jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev, |
| 778 | "mistat: %x D_CD: %x\n", ch->ch_mistat, ch->ch_mistat & UART_MSR_DCD); |
| 779 | phys_carrier = 1; |
| 780 | } |
| 781 | |
| 782 | if (ch->ch_c_cflag & CLOCAL) |
| 783 | virt_carrier = 1; |
| 784 | |
| 785 | jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev, |
| 786 | "DCD: physical: %d virt: %d\n", phys_carrier, virt_carrier); |
| 787 | |
| 788 | /* |
| 789 | * Test for a VIRTUAL carrier transition to HIGH. |
| 790 | */ |
| 791 | if (((ch->ch_flags & CH_FCAR) == 0) && (virt_carrier == 1)) { |
| 792 | |
| 793 | /* |
| 794 | * When carrier rises, wake any threads waiting |
| 795 | * for carrier in the open routine. |
| 796 | */ |
| 797 | |
| 798 | jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev, |
| 799 | "carrier: virt DCD rose\n"); |
| 800 | |
| 801 | if (waitqueue_active(&(ch->ch_flags_wait))) |
| 802 | wake_up_interruptible(&ch->ch_flags_wait); |
| 803 | } |
| 804 | |
| 805 | /* |
| 806 | * Test for a PHYSICAL carrier transition to HIGH. |
| 807 | */ |
| 808 | if (((ch->ch_flags & CH_CD) == 0) && (phys_carrier == 1)) { |
| 809 | |
| 810 | /* |
| 811 | * When carrier rises, wake any threads waiting |
| 812 | * for carrier in the open routine. |
| 813 | */ |
| 814 | |
| 815 | jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev, |
| 816 | "carrier: physical DCD rose\n"); |
| 817 | |
| 818 | if (waitqueue_active(&(ch->ch_flags_wait))) |
| 819 | wake_up_interruptible(&ch->ch_flags_wait); |
| 820 | } |
| 821 | |
| 822 | /* |
| 823 | * Test for a PHYSICAL transition to low, so long as we aren't |
| 824 | * currently ignoring physical transitions (which is what "virtual |
| 825 | * carrier" indicates). |
| 826 | * |
| 827 | * The transition of the virtual carrier to low really doesn't |
| 828 | * matter... it really only means "ignore carrier state", not |
| 829 | * "make pretend that carrier is there". |
| 830 | */ |
| 831 | if ((virt_carrier == 0) && ((ch->ch_flags & CH_CD) != 0) |
| 832 | && (phys_carrier == 0)) { |
| 833 | /* |
| 834 | * When carrier drops: |
| 835 | * |
| 836 | * Drop carrier on all open units. |
| 837 | * |
| 838 | * Flush queues, waking up any task waiting in the |
| 839 | * line discipline. |
| 840 | * |
| 841 | * Send a hangup to the control terminal. |
| 842 | * |
| 843 | * Enable all select calls. |
| 844 | */ |
| 845 | if (waitqueue_active(&(ch->ch_flags_wait))) |
| 846 | wake_up_interruptible(&ch->ch_flags_wait); |
| 847 | } |
| 848 | |
| 849 | /* |
| 850 | * Make sure that our cached values reflect the current reality. |
| 851 | */ |
| 852 | if (virt_carrier == 1) |
| 853 | ch->ch_flags |= CH_FCAR; |
| 854 | else |
| 855 | ch->ch_flags &= ~CH_FCAR; |
| 856 | |
| 857 | if (phys_carrier == 1) |
| 858 | ch->ch_flags |= CH_CD; |
| 859 | else |
| 860 | ch->ch_flags &= ~CH_CD; |
| 861 | } |
| 862 | |
| 863 | |
| 864 | void jsm_check_queue_flow_control(struct jsm_channel *ch) |
| 865 | { |
| 866 | int qleft = 0; |
| 867 | |
| 868 | /* Store how much space we have left in the queue */ |
| 869 | if ((qleft = ch->ch_r_tail - ch->ch_r_head - 1) < 0) |
| 870 | qleft += RQUEUEMASK + 1; |
| 871 | |
| 872 | /* |
| 873 | * Check to see if we should enforce flow control on our queue because |
| 874 | * the ld (or user) isn't reading data out of our queue fast enuf. |
| 875 | * |
| 876 | * NOTE: This is done based on what the current flow control of the |
| 877 | * port is set for. |
| 878 | * |
| 879 | * 1) HWFLOW (RTS) - Turn off the UART's Receive interrupt. |
| 880 | * This will cause the UART's FIFO to back up, and force |
| 881 | * the RTS signal to be dropped. |
| 882 | * 2) SWFLOW (IXOFF) - Keep trying to send a stop character to |
| 883 | * the other side, in hopes it will stop sending data to us. |
| 884 | * 3) NONE - Nothing we can do. We will simply drop any extra data |
| 885 | * that gets sent into us when the queue fills up. |
| 886 | */ |
| 887 | if (qleft < 256) { |
| 888 | /* HWFLOW */ |
| 889 | if (ch->ch_c_cflag & CRTSCTS) { |
| 890 | if(!(ch->ch_flags & CH_RECEIVER_OFF)) { |
| 891 | ch->ch_bd->bd_ops->disable_receiver(ch); |
| 892 | ch->ch_flags |= (CH_RECEIVER_OFF); |
| 893 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, |
| 894 | "Internal queue hit hilevel mark (%d)! Turning off interrupts.\n", |
| 895 | qleft); |
| 896 | } |
| 897 | } |
| 898 | /* SWFLOW */ |
| 899 | else if (ch->ch_c_iflag & IXOFF) { |
| 900 | if (ch->ch_stops_sent <= MAX_STOPS_SENT) { |
| 901 | ch->ch_bd->bd_ops->send_stop_character(ch); |
| 902 | ch->ch_stops_sent++; |
| 903 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, |
| 904 | "Sending stop char! Times sent: %x\n", ch->ch_stops_sent); |
| 905 | } |
| 906 | } |
| 907 | } |
| 908 | |
| 909 | /* |
| 910 | * Check to see if we should unenforce flow control because |
| 911 | * ld (or user) finally read enuf data out of our queue. |
| 912 | * |
| 913 | * NOTE: This is done based on what the current flow control of the |
| 914 | * port is set for. |
| 915 | * |
| 916 | * 1) HWFLOW (RTS) - Turn back on the UART's Receive interrupt. |
| 917 | * This will cause the UART's FIFO to raise RTS back up, |
| 918 | * which will allow the other side to start sending data again. |
| 919 | * 2) SWFLOW (IXOFF) - Send a start character to |
| 920 | * the other side, so it will start sending data to us again. |
| 921 | * 3) NONE - Do nothing. Since we didn't do anything to turn off the |
| 922 | * other side, we don't need to do anything now. |
| 923 | */ |
| 924 | if (qleft > (RQUEUESIZE / 2)) { |
| 925 | /* HWFLOW */ |
| 926 | if (ch->ch_c_cflag & CRTSCTS) { |
| 927 | if (ch->ch_flags & CH_RECEIVER_OFF) { |
| 928 | ch->ch_bd->bd_ops->enable_receiver(ch); |
| 929 | ch->ch_flags &= ~(CH_RECEIVER_OFF); |
| 930 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, |
| 931 | "Internal queue hit lowlevel mark (%d)! Turning on interrupts.\n", |
| 932 | qleft); |
| 933 | } |
| 934 | } |
| 935 | /* SWFLOW */ |
| 936 | else if (ch->ch_c_iflag & IXOFF && ch->ch_stops_sent) { |
| 937 | ch->ch_stops_sent = 0; |
| 938 | ch->ch_bd->bd_ops->send_start_character(ch); |
| 939 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "Sending start char!\n"); |
| 940 | } |
| 941 | } |
| 942 | } |
| 943 | |
| 944 | /* |
| 945 | * jsm_tty_write() |
| 946 | * |
| 947 | * Take data from the user or kernel and send it out to the FEP. |
| 948 | * In here exists all the Transparent Print magic as well. |
| 949 | */ |
| 950 | int jsm_tty_write(struct uart_port *port) |
| 951 | { |
| 952 | int bufcount = 0, n = 0; |
| 953 | int data_count = 0,data_count1 =0; |
| 954 | u16 head; |
| 955 | u16 tail; |
| 956 | u16 tmask; |
| 957 | u32 remain; |
| 958 | int temp_tail = port->info->xmit.tail; |
| 959 | struct jsm_channel *channel = (struct jsm_channel *)port; |
| 960 | |
| 961 | tmask = WQUEUEMASK; |
| 962 | head = (channel->ch_w_head) & tmask; |
| 963 | tail = (channel->ch_w_tail) & tmask; |
| 964 | |
| 965 | if ((bufcount = tail - head - 1) < 0) |
| 966 | bufcount += WQUEUESIZE; |
| 967 | |
| 968 | n = bufcount; |
| 969 | |
| 970 | n = min(n, 56); |
| 971 | remain = WQUEUESIZE - head; |
| 972 | |
| 973 | data_count = 0; |
| 974 | if (n >= remain) { |
| 975 | n -= remain; |
| 976 | while ((port->info->xmit.head != temp_tail) && |
| 977 | (data_count < remain)) { |
| 978 | channel->ch_wqueue[head++] = |
| 979 | port->info->xmit.buf[temp_tail]; |
| 980 | |
| 981 | temp_tail++; |
| 982 | temp_tail &= (UART_XMIT_SIZE - 1); |
| 983 | data_count++; |
| 984 | } |
| 985 | if (data_count == remain) head = 0; |
| 986 | } |
| 987 | |
| 988 | data_count1 = 0; |
| 989 | if (n > 0) { |
| 990 | remain = n; |
| 991 | while ((port->info->xmit.head != temp_tail) && |
| 992 | (data_count1 < remain)) { |
| 993 | channel->ch_wqueue[head++] = |
| 994 | port->info->xmit.buf[temp_tail]; |
| 995 | |
| 996 | temp_tail++; |
| 997 | temp_tail &= (UART_XMIT_SIZE - 1); |
| 998 | data_count1++; |
| 999 | |
| 1000 | } |
| 1001 | } |
| 1002 | |
| 1003 | port->info->xmit.tail = temp_tail; |
| 1004 | |
| 1005 | data_count += data_count1; |
| 1006 | if (data_count) { |
| 1007 | head &= tmask; |
| 1008 | channel->ch_w_head = head; |
| 1009 | } |
| 1010 | |
| 1011 | if (data_count) { |
| 1012 | channel->ch_bd->bd_ops->copy_data_from_queue_to_uart(channel); |
| 1013 | } |
| 1014 | |
| 1015 | return data_count; |
| 1016 | } |