1/* 2 * drivers/char/vme_scc.c: MVME147, MVME162, BVME6000 SCC serial ports 3 * implementation. 4 * Copyright 1999 Richard Hirst <richard@sleepie.demon.co.uk> 5 * 6 * Based on atari_SCC.c which was 7 * Copyright 1994-95 Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de> 8 * Partially based on PC-Linux serial.c by Linus Torvalds and Theodore Ts'o 9 * 10 * This file is subject to the terms and conditions of the GNU General Public 11 * License. See the file COPYING in the main directory of this archive 12 * for more details. 13 * 14 */ 15 16#include <linux/module.h> 17#include <linux/kdev_t.h> 18#include <asm/io.h> 19#include <linux/kernel.h> 20#include <linux/ioport.h> 21#include <linux/interrupt.h> 22#include <linux/errno.h> 23#include <linux/tty.h> 24#include <linux/tty_flip.h> 25#include <linux/mm.h> 26#include <linux/serial.h> 27#include <linux/fcntl.h> 28#include <linux/major.h> 29#include <linux/delay.h> 30#include <linux/miscdevice.h> 31#include <linux/console.h> 32#include <linux/init.h> 33#include <asm/setup.h> 34#include <asm/bootinfo.h> 35 36#ifdef CONFIG_MVME147_SCC 37#include <asm/mvme147hw.h> 38#endif 39#ifdef CONFIG_MVME162_SCC 40#include <asm/mvme16xhw.h> 41#endif 42#ifdef CONFIG_BVME6000_SCC 43#include <asm/bvme6000hw.h> 44#endif 45 46#include <linux/generic_serial.h> 47#include "scc.h" 48 49 50#define CHANNEL_A 0 51#define CHANNEL_B 1 52 53#define SCC_MINOR_BASE 64 54 55/* Shadows for all SCC write registers */ 56static unsigned char scc_shadow[2][16]; 57 58/* Location to access for SCC register access delay */ 59static volatile unsigned char *scc_del = NULL; 60 61/* To keep track of STATUS_REG state for detection of Ext/Status int source */ 62static unsigned char scc_last_status_reg[2]; 63 64/***************************** Prototypes *****************************/ 65 66/* Function prototypes */ 67static void scc_disable_tx_interrupts(void * ptr); 68static void scc_enable_tx_interrupts(void * ptr); 69static void scc_disable_rx_interrupts(void * ptr); 70static void scc_enable_rx_interrupts(void * ptr); 71static int scc_carrier_raised(struct tty_port *port); 72static void scc_shutdown_port(void * ptr); 73static int scc_set_real_termios(void *ptr); 74static void scc_hungup(void *ptr); 75static void scc_close(void *ptr); 76static int scc_chars_in_buffer(void * ptr); 77static int scc_open(struct tty_struct * tty, struct file * filp); 78static int scc_ioctl(struct tty_struct * tty, struct file * filp, 79 unsigned int cmd, unsigned long arg); 80static void scc_throttle(struct tty_struct *tty); 81static void scc_unthrottle(struct tty_struct *tty); 82static irqreturn_t scc_tx_int(int irq, void *data); 83static irqreturn_t scc_rx_int(int irq, void *data); 84static irqreturn_t scc_stat_int(int irq, void *data); 85static irqreturn_t scc_spcond_int(int irq, void *data); 86static void scc_setsignals(struct scc_port *port, int dtr, int rts); 87static int scc_break_ctl(struct tty_struct *tty, int break_state); 88 89static struct tty_driver *scc_driver; 90 91static struct scc_port scc_ports[2]; 92 93/*--------------------------------------------------------------------------- 94 * Interface from generic_serial.c back here 95 *--------------------------------------------------------------------------*/ 96 97static struct real_driver scc_real_driver = { 98 scc_disable_tx_interrupts, 99 scc_enable_tx_interrupts, 100 scc_disable_rx_interrupts, 101 scc_enable_rx_interrupts, 102 scc_shutdown_port, 103 scc_set_real_termios, 104 scc_chars_in_buffer, 105 scc_close, 106 scc_hungup, 107 NULL 108}; 109 110 111static const struct tty_operations scc_ops = { 112 .open = scc_open, 113 .close = gs_close, 114 .write = gs_write, 115 .put_char = gs_put_char, 116 .flush_chars = gs_flush_chars, 117 .write_room = gs_write_room, 118 .chars_in_buffer = gs_chars_in_buffer, 119 .flush_buffer = gs_flush_buffer, 120 .ioctl = scc_ioctl, 121 .throttle = scc_throttle, 122 .unthrottle = scc_unthrottle, 123 .set_termios = gs_set_termios, 124 .stop = gs_stop, 125 .start = gs_start, 126 .hangup = gs_hangup, 127 .break_ctl = scc_break_ctl, 128}; 129 130static const struct tty_port_operations scc_port_ops = { 131 .carrier_raised = scc_carrier_raised, 132}; 133 134/*---------------------------------------------------------------------------- 135 * vme_scc_init() and support functions 136 *---------------------------------------------------------------------------*/ 137 138static int __init scc_init_drivers(void) 139{ 140 int error; 141 142 scc_driver = alloc_tty_driver(2); 143 if (!scc_driver) 144 return -ENOMEM; 145 scc_driver->owner = THIS_MODULE; 146 scc_driver->driver_name = "scc"; 147 scc_driver->name = "ttyS"; 148 scc_driver->major = TTY_MAJOR; 149 scc_driver->minor_start = SCC_MINOR_BASE; 150 scc_driver->type = TTY_DRIVER_TYPE_SERIAL; 151 scc_driver->subtype = SERIAL_TYPE_NORMAL; 152 scc_driver->init_termios = tty_std_termios; 153 scc_driver->init_termios.c_cflag = 154 B9600 | CS8 | CREAD | HUPCL | CLOCAL; 155 scc_driver->init_termios.c_ispeed = 9600; 156 scc_driver->init_termios.c_ospeed = 9600; 157 scc_driver->flags = TTY_DRIVER_REAL_RAW; 158 tty_set_operations(scc_driver, &scc_ops); 159 160 if ((error = tty_register_driver(scc_driver))) { 161 printk(KERN_ERR "scc: Couldn't register scc driver, error = %d\n", 162 error); 163 put_tty_driver(scc_driver); 164 return 1; 165 } 166 167 return 0; 168} 169 170 171/* ports[] array is indexed by line no (i.e. [0] for ttyS0, [1] for ttyS1). 172 */ 173 174static void __init scc_init_portstructs(void) 175{ 176 struct scc_port *port; 177 int i; 178 179 for (i = 0; i < 2; i++) { 180 port = scc_ports + i; 181 tty_port_init(&port->gs.port); 182 port->gs.port.ops = &scc_port_ops; 183 port->gs.magic = SCC_MAGIC; 184 port->gs.close_delay = HZ/2; 185 port->gs.closing_wait = 30 * HZ; 186 port->gs.rd = &scc_real_driver; 187#ifdef NEW_WRITE_LOCKING 188 port->gs.port_write_mutex = MUTEX; 189#endif 190 init_waitqueue_head(&port->gs.port.open_wait); 191 init_waitqueue_head(&port->gs.port.close_wait); 192 } 193} 194 195 196#ifdef CONFIG_MVME147_SCC 197static int __init mvme147_scc_init(void) 198{ 199 struct scc_port *port; 200 int error; 201 202 printk(KERN_INFO "SCC: MVME147 Serial Driver\n"); 203 /* Init channel A */ 204 port = &scc_ports[0]; 205 port->channel = CHANNEL_A; 206 port->ctrlp = (volatile unsigned char *)M147_SCC_A_ADDR; 207 port->datap = port->ctrlp + 1; 208 port->port_a = &scc_ports[0]; 209 port->port_b = &scc_ports[1]; 210 error = request_irq(MVME147_IRQ_SCCA_TX, scc_tx_int, IRQF_DISABLED, 211 "SCC-A TX", port); 212 if (error) 213 goto fail; 214 error = request_irq(MVME147_IRQ_SCCA_STAT, scc_stat_int, IRQF_DISABLED, 215 "SCC-A status", port); 216 if (error) 217 goto fail_free_a_tx; 218 error = request_irq(MVME147_IRQ_SCCA_RX, scc_rx_int, IRQF_DISABLED, 219 "SCC-A RX", port); 220 if (error) 221 goto fail_free_a_stat; 222 error = request_irq(MVME147_IRQ_SCCA_SPCOND, scc_spcond_int, 223 IRQF_DISABLED, "SCC-A special cond", port); 224 if (error) 225 goto fail_free_a_rx; 226 227 { 228 SCC_ACCESS_INIT(port); 229 230 /* disable interrupts for this channel */ 231 SCCwrite(INT_AND_DMA_REG, 0); 232 /* Set the interrupt vector */ 233 SCCwrite(INT_VECTOR_REG, MVME147_IRQ_SCC_BASE); 234 /* Interrupt parameters: vector includes status, status low */ 235 SCCwrite(MASTER_INT_CTRL, MIC_VEC_INCL_STAT); 236 SCCmod(MASTER_INT_CTRL, 0xff, MIC_MASTER_INT_ENAB); 237 } 238 239 /* Init channel B */ 240 port = &scc_ports[1]; 241 port->channel = CHANNEL_B; 242 port->ctrlp = (volatile unsigned char *)M147_SCC_B_ADDR; 243 port->datap = port->ctrlp + 1; 244 port->port_a = &scc_ports[0]; 245 port->port_b = &scc_ports[1]; 246 error = request_irq(MVME147_IRQ_SCCB_TX, scc_tx_int, IRQF_DISABLED, 247 "SCC-B TX", port); 248 if (error) 249 goto fail_free_a_spcond; 250 error = request_irq(MVME147_IRQ_SCCB_STAT, scc_stat_int, IRQF_DISABLED, 251 "SCC-B status", port); 252 if (error) 253 goto fail_free_b_tx; 254 error = request_irq(MVME147_IRQ_SCCB_RX, scc_rx_int, IRQF_DISABLED, 255 "SCC-B RX", port); 256 if (error) 257 goto fail_free_b_stat; 258 error = request_irq(MVME147_IRQ_SCCB_SPCOND, scc_spcond_int, 259 IRQF_DISABLED, "SCC-B special cond", port); 260 if (error) 261 goto fail_free_b_rx; 262 263 { 264 SCC_ACCESS_INIT(port); 265 266 /* disable interrupts for this channel */ 267 SCCwrite(INT_AND_DMA_REG, 0); 268 } 269 270 /* Ensure interrupts are enabled in the PCC chip */ 271 m147_pcc->serial_cntrl=PCC_LEVEL_SERIAL|PCC_INT_ENAB; 272 273 /* Initialise the tty driver structures and register */ 274 scc_init_portstructs(); 275 scc_init_drivers(); 276 277 return 0; 278 279fail_free_b_rx: 280 free_irq(MVME147_IRQ_SCCB_RX, port); 281fail_free_b_stat: 282 free_irq(MVME147_IRQ_SCCB_STAT, port); 283fail_free_b_tx: 284 free_irq(MVME147_IRQ_SCCB_TX, port); 285fail_free_a_spcond: 286 free_irq(MVME147_IRQ_SCCA_SPCOND, port); 287fail_free_a_rx: 288 free_irq(MVME147_IRQ_SCCA_RX, port); 289fail_free_a_stat: 290 free_irq(MVME147_IRQ_SCCA_STAT, port); 291fail_free_a_tx: 292 free_irq(MVME147_IRQ_SCCA_TX, port); 293fail: 294 return error; 295} 296#endif 297 298 299#ifdef CONFIG_MVME162_SCC 300static int __init mvme162_scc_init(void) 301{ 302 struct scc_port *port; 303 int error; 304 305 if (!(mvme16x_config & MVME16x_CONFIG_GOT_SCCA)) 306 return (-ENODEV); 307 308 printk(KERN_INFO "SCC: MVME162 Serial Driver\n"); 309 /* Init channel A */ 310 port = &scc_ports[0]; 311 port->channel = CHANNEL_A; 312 port->ctrlp = (volatile unsigned char *)MVME_SCC_A_ADDR; 313 port->datap = port->ctrlp + 2; 314 port->port_a = &scc_ports[0]; 315 port->port_b = &scc_ports[1]; 316 error = request_irq(MVME162_IRQ_SCCA_TX, scc_tx_int, IRQF_DISABLED, 317 "SCC-A TX", port); 318 if (error) 319 goto fail; 320 error = request_irq(MVME162_IRQ_SCCA_STAT, scc_stat_int, IRQF_DISABLED, 321 "SCC-A status", port); 322 if (error) 323 goto fail_free_a_tx; 324 error = request_irq(MVME162_IRQ_SCCA_RX, scc_rx_int, IRQF_DISABLED, 325 "SCC-A RX", port); 326 if (error) 327 goto fail_free_a_stat; 328 error = request_irq(MVME162_IRQ_SCCA_SPCOND, scc_spcond_int, 329 IRQF_DISABLED, "SCC-A special cond", port); 330 if (error) 331 goto fail_free_a_rx; 332 333 { 334 SCC_ACCESS_INIT(port); 335 336 /* disable interrupts for this channel */ 337 SCCwrite(INT_AND_DMA_REG, 0); 338 /* Set the interrupt vector */ 339 SCCwrite(INT_VECTOR_REG, MVME162_IRQ_SCC_BASE); 340 /* Interrupt parameters: vector includes status, status low */ 341 SCCwrite(MASTER_INT_CTRL, MIC_VEC_INCL_STAT); 342 SCCmod(MASTER_INT_CTRL, 0xff, MIC_MASTER_INT_ENAB); 343 } 344 345 /* Init channel B */ 346 port = &scc_ports[1]; 347 port->channel = CHANNEL_B; 348 port->ctrlp = (volatile unsigned char *)MVME_SCC_B_ADDR; 349 port->datap = port->ctrlp + 2; 350 port->port_a = &scc_ports[0]; 351 port->port_b = &scc_ports[1]; 352 error = request_irq(MVME162_IRQ_SCCB_TX, scc_tx_int, IRQF_DISABLED, 353 "SCC-B TX", port); 354 if (error) 355 goto fail_free_a_spcond; 356 error = request_irq(MVME162_IRQ_SCCB_STAT, scc_stat_int, IRQF_DISABLED, 357 "SCC-B status", port); 358 if (error) 359 goto fail_free_b_tx; 360 error = request_irq(MVME162_IRQ_SCCB_RX, scc_rx_int, IRQF_DISABLED, 361 "SCC-B RX", port); 362 if (error) 363 goto fail_free_b_stat; 364 error = request_irq(MVME162_IRQ_SCCB_SPCOND, scc_spcond_int, 365 IRQF_DISABLED, "SCC-B special cond", port); 366 if (error) 367 goto fail_free_b_rx; 368 369 { 370 SCC_ACCESS_INIT(port); /* Either channel will do */ 371 372 /* disable interrupts for this channel */ 373 SCCwrite(INT_AND_DMA_REG, 0); 374 } 375 376 /* Ensure interrupts are enabled in the MC2 chip */ 377 *(volatile char *)0xfff4201d = 0x14; 378 379 /* Initialise the tty driver structures and register */ 380 scc_init_portstructs(); 381 scc_init_drivers(); 382 383 return 0; 384 385fail_free_b_rx: 386 free_irq(MVME162_IRQ_SCCB_RX, port); 387fail_free_b_stat: 388 free_irq(MVME162_IRQ_SCCB_STAT, port); 389fail_free_b_tx: 390 free_irq(MVME162_IRQ_SCCB_TX, port); 391fail_free_a_spcond: 392 free_irq(MVME162_IRQ_SCCA_SPCOND, port); 393fail_free_a_rx: 394 free_irq(MVME162_IRQ_SCCA_RX, port); 395fail_free_a_stat: 396 free_irq(MVME162_IRQ_SCCA_STAT, port); 397fail_free_a_tx: 398 free_irq(MVME162_IRQ_SCCA_TX, port); 399fail: 400 return error; 401} 402#endif 403 404 405#ifdef CONFIG_BVME6000_SCC 406static int __init bvme6000_scc_init(void) 407{ 408 struct scc_port *port; 409 int error; 410 411 printk(KERN_INFO "SCC: BVME6000 Serial Driver\n"); 412 /* Init channel A */ 413 port = &scc_ports[0]; 414 port->channel = CHANNEL_A; 415 port->ctrlp = (volatile unsigned char *)BVME_SCC_A_ADDR; 416 port->datap = port->ctrlp + 4; 417 port->port_a = &scc_ports[0]; 418 port->port_b = &scc_ports[1]; 419 error = request_irq(BVME_IRQ_SCCA_TX, scc_tx_int, IRQF_DISABLED, 420 "SCC-A TX", port); 421 if (error) 422 goto fail; 423 error = request_irq(BVME_IRQ_SCCA_STAT, scc_stat_int, IRQF_DISABLED, 424 "SCC-A status", port); 425 if (error) 426 goto fail_free_a_tx; 427 error = request_irq(BVME_IRQ_SCCA_RX, scc_rx_int, IRQF_DISABLED, 428 "SCC-A RX", port); 429 if (error) 430 goto fail_free_a_stat; 431 error = request_irq(BVME_IRQ_SCCA_SPCOND, scc_spcond_int, 432 IRQF_DISABLED, "SCC-A special cond", port); 433 if (error) 434 goto fail_free_a_rx; 435 436 { 437 SCC_ACCESS_INIT(port); 438 439 /* disable interrupts for this channel */ 440 SCCwrite(INT_AND_DMA_REG, 0); 441 /* Set the interrupt vector */ 442 SCCwrite(INT_VECTOR_REG, BVME_IRQ_SCC_BASE); 443 /* Interrupt parameters: vector includes status, status low */ 444 SCCwrite(MASTER_INT_CTRL, MIC_VEC_INCL_STAT); 445 SCCmod(MASTER_INT_CTRL, 0xff, MIC_MASTER_INT_ENAB); 446 } 447 448 /* Init channel B */ 449 port = &scc_ports[1]; 450 port->channel = CHANNEL_B; 451 port->ctrlp = (volatile unsigned char *)BVME_SCC_B_ADDR; 452 port->datap = port->ctrlp + 4; 453 port->port_a = &scc_ports[0]; 454 port->port_b = &scc_ports[1]; 455 error = request_irq(BVME_IRQ_SCCB_TX, scc_tx_int, IRQF_DISABLED, 456 "SCC-B TX", port); 457 if (error) 458 goto fail_free_a_spcond; 459 error = request_irq(BVME_IRQ_SCCB_STAT, scc_stat_int, IRQF_DISABLED, 460 "SCC-B status", port); 461 if (error) 462 goto fail_free_b_tx; 463 error = request_irq(BVME_IRQ_SCCB_RX, scc_rx_int, IRQF_DISABLED, 464 "SCC-B RX", port); 465 if (error) 466 goto fail_free_b_stat; 467 error = request_irq(BVME_IRQ_SCCB_SPCOND, scc_spcond_int, 468 IRQF_DISABLED, "SCC-B special cond", port); 469 if (error) 470 goto fail_free_b_rx; 471 472 { 473 SCC_ACCESS_INIT(port); /* Either channel will do */ 474 475 /* disable interrupts for this channel */ 476 SCCwrite(INT_AND_DMA_REG, 0); 477 } 478 479 /* Initialise the tty driver structures and register */ 480 scc_init_portstructs(); 481 scc_init_drivers(); 482 483 return 0; 484 485fail: 486 free_irq(BVME_IRQ_SCCA_STAT, port); 487fail_free_a_tx: 488 free_irq(BVME_IRQ_SCCA_RX, port); 489fail_free_a_stat: 490 free_irq(BVME_IRQ_SCCA_SPCOND, port); 491fail_free_a_rx: 492 free_irq(BVME_IRQ_SCCB_TX, port); 493fail_free_a_spcond: 494 free_irq(BVME_IRQ_SCCB_STAT, port); 495fail_free_b_tx: 496 free_irq(BVME_IRQ_SCCB_RX, port); 497fail_free_b_stat: 498 free_irq(BVME_IRQ_SCCB_SPCOND, port); 499fail_free_b_rx: 500 return error; 501} 502#endif 503 504 505static int __init vme_scc_init(void) 506{ 507 int res = -ENODEV; 508 509#ifdef CONFIG_MVME147_SCC 510 if (MACH_IS_MVME147) 511 res = mvme147_scc_init(); 512#endif 513#ifdef CONFIG_MVME162_SCC 514 if (MACH_IS_MVME16x) 515 res = mvme162_scc_init(); 516#endif 517#ifdef CONFIG_BVME6000_SCC 518 if (MACH_IS_BVME6000) 519 res = bvme6000_scc_init(); 520#endif 521 return res; 522} 523 524module_init(vme_scc_init); 525 526 527/*--------------------------------------------------------------------------- 528 * Interrupt handlers 529 *--------------------------------------------------------------------------*/ 530 531static irqreturn_t scc_rx_int(int irq, void *data) 532{ 533 unsigned char ch; 534 struct scc_port *port = data; 535 struct tty_struct *tty = port->gs.port.tty; 536 SCC_ACCESS_INIT(port); 537 538 ch = SCCread_NB(RX_DATA_REG); 539 if (!tty) { 540 printk(KERN_WARNING "scc_rx_int with NULL tty!\n"); 541 SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET); 542 return IRQ_HANDLED; 543 } 544 tty_insert_flip_char(tty, ch, 0); 545 546 /* Check if another character is already ready; in that case, the 547 * spcond_int() function must be used, because this character may have an 548 * error condition that isn't signalled by the interrupt vector used! 549 */ 550 if (SCCread(INT_PENDING_REG) & 551 (port->channel == CHANNEL_A ? IPR_A_RX : IPR_B_RX)) { 552 scc_spcond_int (irq, data); 553 return IRQ_HANDLED; 554 } 555 556 SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET); 557 558 tty_flip_buffer_push(tty); 559 return IRQ_HANDLED; 560} 561 562 563static irqreturn_t scc_spcond_int(int irq, void *data) 564{ 565 struct scc_port *port = data; 566 struct tty_struct *tty = port->gs.port.tty; 567 unsigned char stat, ch, err; 568 int int_pending_mask = port->channel == CHANNEL_A ? 569 IPR_A_RX : IPR_B_RX; 570 SCC_ACCESS_INIT(port); 571 572 if (!tty) { 573 printk(KERN_WARNING "scc_spcond_int with NULL tty!\n"); 574 SCCwrite(COMMAND_REG, CR_ERROR_RESET); 575 SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET); 576 return IRQ_HANDLED; 577 } 578 do { 579 stat = SCCread(SPCOND_STATUS_REG); 580 ch = SCCread_NB(RX_DATA_REG); 581 582 if (stat & SCSR_RX_OVERRUN) 583 err = TTY_OVERRUN; 584 else if (stat & SCSR_PARITY_ERR) 585 err = TTY_PARITY; 586 else if (stat & SCSR_CRC_FRAME_ERR) 587 err = TTY_FRAME; 588 else 589 err = 0; 590 591 tty_insert_flip_char(tty, ch, err); 592 593 /* ++TeSche: *All* errors have to be cleared manually, 594 * else the condition persists for the next chars 595 */ 596 if (err) 597 SCCwrite(COMMAND_REG, CR_ERROR_RESET); 598 599 } while(SCCread(INT_PENDING_REG) & int_pending_mask); 600 601 SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET); 602 603 tty_flip_buffer_push(tty); 604 return IRQ_HANDLED; 605} 606 607 608static irqreturn_t scc_tx_int(int irq, void *data) 609{ 610 struct scc_port *port = data; 611 SCC_ACCESS_INIT(port); 612 613 if (!port->gs.port.tty) { 614 printk(KERN_WARNING "scc_tx_int with NULL tty!\n"); 615 SCCmod (INT_AND_DMA_REG, ~IDR_TX_INT_ENAB, 0); 616 SCCwrite(COMMAND_REG, CR_TX_PENDING_RESET); 617 SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET); 618 return IRQ_HANDLED; 619 } 620 while ((SCCread_NB(STATUS_REG) & SR_TX_BUF_EMPTY)) { 621 if (port->x_char) { 622 SCCwrite(TX_DATA_REG, port->x_char); 623 port->x_char = 0; 624 } 625 else if ((port->gs.xmit_cnt <= 0) || 626 port->gs.port.tty->stopped || 627 port->gs.port.tty->hw_stopped) 628 break; 629 else { 630 SCCwrite(TX_DATA_REG, port->gs.xmit_buf[port->gs.xmit_tail++]); 631 port->gs.xmit_tail = port->gs.xmit_tail & (SERIAL_XMIT_SIZE-1); 632 if (--port->gs.xmit_cnt <= 0) 633 break; 634 } 635 } 636 if ((port->gs.xmit_cnt <= 0) || port->gs.port.tty->stopped || 637 port->gs.port.tty->hw_stopped) { 638 /* disable tx interrupts */ 639 SCCmod (INT_AND_DMA_REG, ~IDR_TX_INT_ENAB, 0); 640 SCCwrite(COMMAND_REG, CR_TX_PENDING_RESET); /* disable tx_int on next tx underrun? */ 641 port->gs.port.flags &= ~GS_TX_INTEN; 642 } 643 if (port->gs.port.tty && port->gs.xmit_cnt <= port->gs.wakeup_chars) 644 tty_wakeup(port->gs.port.tty); 645 646 SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET); 647 return IRQ_HANDLED; 648} 649 650 651static irqreturn_t scc_stat_int(int irq, void *data) 652{ 653 struct scc_port *port = data; 654 unsigned channel = port->channel; 655 unsigned char last_sr, sr, changed; 656 SCC_ACCESS_INIT(port); 657 658 last_sr = scc_last_status_reg[channel]; 659 sr = scc_last_status_reg[channel] = SCCread_NB(STATUS_REG); 660 changed = last_sr ^ sr; 661 662 if (changed & SR_DCD) { 663 port->c_dcd = !!(sr & SR_DCD); 664 if (!(port->gs.port.flags & ASYNC_CHECK_CD)) 665 ; /* Don't report DCD changes */ 666 else if (port->c_dcd) { 667 wake_up_interruptible(&port->gs.port.open_wait); 668 } 669 else { 670 if (port->gs.port.tty) 671 tty_hangup (port->gs.port.tty); 672 } 673 } 674 SCCwrite(COMMAND_REG, CR_EXTSTAT_RESET); 675 SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET); 676 return IRQ_HANDLED; 677} 678 679 680/*--------------------------------------------------------------------------- 681 * generic_serial.c callback funtions 682 *--------------------------------------------------------------------------*/ 683 684static void scc_disable_tx_interrupts(void *ptr) 685{ 686 struct scc_port *port = ptr; 687 unsigned long flags; 688 SCC_ACCESS_INIT(port); 689 690 local_irq_save(flags); 691 SCCmod(INT_AND_DMA_REG, ~IDR_TX_INT_ENAB, 0); 692 port->gs.port.flags &= ~GS_TX_INTEN; 693 local_irq_restore(flags); 694} 695 696 697static void scc_enable_tx_interrupts(void *ptr) 698{ 699 struct scc_port *port = ptr; 700 unsigned long flags; 701 SCC_ACCESS_INIT(port); 702 703 local_irq_save(flags); 704 SCCmod(INT_AND_DMA_REG, 0xff, IDR_TX_INT_ENAB); 705 /* restart the transmitter */ 706 scc_tx_int (0, port); 707 local_irq_restore(flags); 708} 709 710 711static void scc_disable_rx_interrupts(void *ptr) 712{ 713 struct scc_port *port = ptr; 714 unsigned long flags; 715 SCC_ACCESS_INIT(port); 716 717 local_irq_save(flags); 718 SCCmod(INT_AND_DMA_REG, 719 ~(IDR_RX_INT_MASK|IDR_PARERR_AS_SPCOND|IDR_EXTSTAT_INT_ENAB), 0); 720 local_irq_restore(flags); 721} 722 723 724static void scc_enable_rx_interrupts(void *ptr) 725{ 726 struct scc_port *port = ptr; 727 unsigned long flags; 728 SCC_ACCESS_INIT(port); 729 730 local_irq_save(flags); 731 SCCmod(INT_AND_DMA_REG, 0xff, 732 IDR_EXTSTAT_INT_ENAB|IDR_PARERR_AS_SPCOND|IDR_RX_INT_ALL); 733 local_irq_restore(flags); 734} 735 736 737static int scc_carrier_raised(struct tty_port *port) 738{ 739 struct scc_port *sc = container_of(port, struct scc_port, gs.port); 740 unsigned channel = sc->channel; 741 742 return !!(scc_last_status_reg[channel] & SR_DCD); 743} 744 745 746static void scc_shutdown_port(void *ptr) 747{ 748 struct scc_port *port = ptr; 749 750 port->gs.port.flags &= ~ GS_ACTIVE; 751 if (port->gs.port.tty && (port->gs.port.tty->termios->c_cflag & HUPCL)) { 752 scc_setsignals (port, 0, 0); 753 } 754} 755 756 757static int scc_set_real_termios (void *ptr) 758{ 759 /* the SCC has char sizes 5,7,6,8 in that order! */ 760 static int chsize_map[4] = { 0, 2, 1, 3 }; 761 unsigned cflag, baud, chsize, channel, brgval = 0; 762 unsigned long flags; 763 struct scc_port *port = ptr; 764 SCC_ACCESS_INIT(port); 765 766 if (!port->gs.port.tty || !port->gs.port.tty->termios) return 0; 767 768 channel = port->channel; 769 770 if (channel == CHANNEL_A) 771 return 0; /* Settings controlled by boot PROM */ 772 773 cflag = port->gs.port.tty->termios->c_cflag; 774 baud = port->gs.baud; 775 chsize = (cflag & CSIZE) >> 4; 776 777 if (baud == 0) { 778 /* speed == 0 -> drop DTR */ 779 local_irq_save(flags); 780 SCCmod(TX_CTRL_REG, ~TCR_DTR, 0); 781 local_irq_restore(flags); 782 return 0; 783 } 784 else if ((MACH_IS_MVME16x && (baud < 50 || baud > 38400)) || 785 (MACH_IS_MVME147 && (baud < 50 || baud > 19200)) || 786 (MACH_IS_BVME6000 &&(baud < 50 || baud > 76800))) { 787 printk(KERN_NOTICE "SCC: Bad speed requested, %d\n", baud); 788 return 0; 789 } 790 791 if (cflag & CLOCAL) 792 port->gs.port.flags &= ~ASYNC_CHECK_CD; 793 else 794 port->gs.port.flags |= ASYNC_CHECK_CD; 795 796#ifdef CONFIG_MVME147_SCC 797 if (MACH_IS_MVME147) 798 brgval = (M147_SCC_PCLK + baud/2) / (16 * 2 * baud) - 2; 799#endif 800#ifdef CONFIG_MVME162_SCC 801 if (MACH_IS_MVME16x) 802 brgval = (MVME_SCC_PCLK + baud/2) / (16 * 2 * baud) - 2; 803#endif 804#ifdef CONFIG_BVME6000_SCC 805 if (MACH_IS_BVME6000) 806 brgval = (BVME_SCC_RTxC + baud/2) / (16 * 2 * baud) - 2; 807#endif 808 /* Now we have all parameters and can go to set them: */ 809 local_irq_save(flags); 810 811 /* receiver's character size and auto-enables */ 812 SCCmod(RX_CTRL_REG, ~(RCR_CHSIZE_MASK|RCR_AUTO_ENAB_MODE), 813 (chsize_map[chsize] << 6) | 814 ((cflag & CRTSCTS) ? RCR_AUTO_ENAB_MODE : 0)); 815 /* parity and stop bits (both, Tx and Rx), clock mode never changes */ 816 SCCmod (AUX1_CTRL_REG, 817 ~(A1CR_PARITY_MASK | A1CR_MODE_MASK), 818 ((cflag & PARENB 819 ? (cflag & PARODD ? A1CR_PARITY_ODD : A1CR_PARITY_EVEN) 820 : A1CR_PARITY_NONE) 821 | (cflag & CSTOPB ? A1CR_MODE_ASYNC_2 : A1CR_MODE_ASYNC_1))); 822 /* sender's character size, set DTR for valid baud rate */ 823 SCCmod(TX_CTRL_REG, ~TCR_CHSIZE_MASK, chsize_map[chsize] << 5 | TCR_DTR); 824 /* clock sources never change */ 825 /* disable BRG before changing the value */ 826 SCCmod(DPLL_CTRL_REG, ~DCR_BRG_ENAB, 0); 827 /* BRG value */ 828 SCCwrite(TIMER_LOW_REG, brgval & 0xff); 829 SCCwrite(TIMER_HIGH_REG, (brgval >> 8) & 0xff); 830 /* BRG enable, and clock source never changes */ 831 SCCmod(DPLL_CTRL_REG, 0xff, DCR_BRG_ENAB); 832 833 local_irq_restore(flags); 834 835 return 0; 836} 837 838 839static int scc_chars_in_buffer (void *ptr) 840{ 841 struct scc_port *port = ptr; 842 SCC_ACCESS_INIT(port); 843 844 return (SCCread (SPCOND_STATUS_REG) & SCSR_ALL_SENT) ? 0 : 1; 845} 846 847 848/* Comment taken from sx.c (2.4.0): 849 I haven't the foggiest why the decrement use count has to happen 850 here. The whole linux serial drivers stuff needs to be redesigned. 851 My guess is that this is a hack to minimize the impact of a bug 852 elsewhere. Thinking about it some more. (try it sometime) Try 853 running minicom on a serial port that is driven by a modularized 854 driver. Have the modem hangup. Then remove the driver module. Then 855 exit minicom. I expect an "oops". -- REW */ 856 857static void scc_hungup(void *ptr) 858{ 859 scc_disable_tx_interrupts(ptr); 860 scc_disable_rx_interrupts(ptr); 861} 862 863 864static void scc_close(void *ptr) 865{ 866 scc_disable_tx_interrupts(ptr); 867 scc_disable_rx_interrupts(ptr); 868} 869 870 871/*--------------------------------------------------------------------------- 872 * Internal support functions 873 *--------------------------------------------------------------------------*/ 874 875static void scc_setsignals(struct scc_port *port, int dtr, int rts) 876{ 877 unsigned long flags; 878 unsigned char t; 879 SCC_ACCESS_INIT(port); 880 881 local_irq_save(flags); 882 t = SCCread(TX_CTRL_REG); 883 if (dtr >= 0) t = dtr? (t | TCR_DTR): (t & ~TCR_DTR); 884 if (rts >= 0) t = rts? (t | TCR_RTS): (t & ~TCR_RTS); 885 SCCwrite(TX_CTRL_REG, t); 886 local_irq_restore(flags); 887} 888 889 890static void scc_send_xchar(struct tty_struct *tty, char ch) 891{ 892 struct scc_port *port = tty->driver_data; 893 894 port->x_char = ch; 895 if (ch) 896 scc_enable_tx_interrupts(port); 897} 898 899 900/*--------------------------------------------------------------------------- 901 * Driver entrypoints referenced from above 902 *--------------------------------------------------------------------------*/ 903 904static int scc_open (struct tty_struct * tty, struct file * filp) 905{ 906 int line = tty->index; 907 int retval; 908 struct scc_port *port = &scc_ports[line]; 909 int i, channel = port->channel; 910 unsigned long flags; 911 SCC_ACCESS_INIT(port); 912#if defined(CONFIG_MVME162_SCC) || defined(CONFIG_MVME147_SCC) 913 static const struct { 914 unsigned reg, val; 915 } mvme_init_tab[] = { 916 /* Values for MVME162 and MVME147 */ 917 /* no parity, 1 stop bit, async, 1:16 */ 918 { AUX1_CTRL_REG, A1CR_PARITY_NONE|A1CR_MODE_ASYNC_1|A1CR_CLKMODE_x16 }, 919 /* parity error is special cond, ints disabled, no DMA */ 920 { INT_AND_DMA_REG, IDR_PARERR_AS_SPCOND | IDR_RX_INT_DISAB }, 921 /* Rx 8 bits/char, no auto enable, Rx off */ 922 { RX_CTRL_REG, RCR_CHSIZE_8 }, 923 /* DTR off, Tx 8 bits/char, RTS off, Tx off */ 924 { TX_CTRL_REG, TCR_CHSIZE_8 }, 925 /* special features off */ 926 { AUX2_CTRL_REG, 0 }, 927 { CLK_CTRL_REG, CCR_RXCLK_BRG | CCR_TXCLK_BRG }, 928 { DPLL_CTRL_REG, DCR_BRG_ENAB | DCR_BRG_USE_PCLK }, 929 /* Start Rx */ 930 { RX_CTRL_REG, RCR_RX_ENAB | RCR_CHSIZE_8 }, 931 /* Start Tx */ 932 { TX_CTRL_REG, TCR_TX_ENAB | TCR_RTS | TCR_DTR | TCR_CHSIZE_8 }, 933 /* Ext/Stat ints: DCD only */ 934 { INT_CTRL_REG, ICR_ENAB_DCD_INT }, 935 /* Reset Ext/Stat ints */ 936 { COMMAND_REG, CR_EXTSTAT_RESET }, 937 /* ...again */ 938 { COMMAND_REG, CR_EXTSTAT_RESET }, 939 }; 940#endif 941#if defined(CONFIG_BVME6000_SCC) 942 static const struct { 943 unsigned reg, val; 944 } bvme_init_tab[] = { 945 /* Values for BVME6000 */ 946 /* no parity, 1 stop bit, async, 1:16 */ 947 { AUX1_CTRL_REG, A1CR_PARITY_NONE|A1CR_MODE_ASYNC_1|A1CR_CLKMODE_x16 }, 948 /* parity error is special cond, ints disabled, no DMA */ 949 { INT_AND_DMA_REG, IDR_PARERR_AS_SPCOND | IDR_RX_INT_DISAB }, 950 /* Rx 8 bits/char, no auto enable, Rx off */ 951 { RX_CTRL_REG, RCR_CHSIZE_8 }, 952 /* DTR off, Tx 8 bits/char, RTS off, Tx off */ 953 { TX_CTRL_REG, TCR_CHSIZE_8 }, 954 /* special features off */ 955 { AUX2_CTRL_REG, 0 }, 956 { CLK_CTRL_REG, CCR_RTxC_XTAL | CCR_RXCLK_BRG | CCR_TXCLK_BRG }, 957 { DPLL_CTRL_REG, DCR_BRG_ENAB }, 958 /* Start Rx */ 959 { RX_CTRL_REG, RCR_RX_ENAB | RCR_CHSIZE_8 }, 960 /* Start Tx */ 961 { TX_CTRL_REG, TCR_TX_ENAB | TCR_RTS | TCR_DTR | TCR_CHSIZE_8 }, 962 /* Ext/Stat ints: DCD only */ 963 { INT_CTRL_REG, ICR_ENAB_DCD_INT }, 964 /* Reset Ext/Stat ints */ 965 { COMMAND_REG, CR_EXTSTAT_RESET }, 966 /* ...again */ 967 { COMMAND_REG, CR_EXTSTAT_RESET }, 968 }; 969#endif 970 if (!(port->gs.port.flags & ASYNC_INITIALIZED)) { 971 local_irq_save(flags); 972#if defined(CONFIG_MVME147_SCC) || defined(CONFIG_MVME162_SCC) 973 if (MACH_IS_MVME147 || MACH_IS_MVME16x) { 974 for (i = 0; i < ARRAY_SIZE(mvme_init_tab); ++i) 975 SCCwrite(mvme_init_tab[i].reg, mvme_init_tab[i].val); 976 } 977#endif 978#if defined(CONFIG_BVME6000_SCC) 979 if (MACH_IS_BVME6000) { 980 for (i = 0; i < ARRAY_SIZE(bvme_init_tab); ++i) 981 SCCwrite(bvme_init_tab[i].reg, bvme_init_tab[i].val); 982 } 983#endif 984 985 /* remember status register for detection of DCD and CTS changes */ 986 scc_last_status_reg[channel] = SCCread(STATUS_REG); 987 988 port->c_dcd = 0; /* Prevent initial 1->0 interrupt */ 989 scc_setsignals (port, 1,1); 990 local_irq_restore(flags); 991 } 992 993 tty->driver_data = port; 994 port->gs.port.tty = tty; 995 port->gs.port.count++; 996 retval = gs_init_port(&port->gs); 997 if (retval) { 998 port->gs.port.count--; 999 return retval; 1000 } 1001 port->gs.port.flags |= GS_ACTIVE; 1002 retval = gs_block_til_ready(port, filp); 1003 1004 if (retval) { 1005 port->gs.port.count--; 1006 return retval; 1007 } 1008 1009 port->c_dcd = tty_port_carrier_raised(&port->gs.port); 1010 1011 scc_enable_rx_interrupts(port); 1012 1013 return 0; 1014} 1015 1016 1017static void scc_throttle (struct tty_struct * tty) 1018{ 1019 struct scc_port *port = tty->driver_data; 1020 unsigned long flags; 1021 SCC_ACCESS_INIT(port); 1022 1023 if (tty->termios->c_cflag & CRTSCTS) { 1024 local_irq_save(flags); 1025 SCCmod(TX_CTRL_REG, ~TCR_RTS, 0); 1026 local_irq_restore(flags); 1027 } 1028 if (I_IXOFF(tty)) 1029 scc_send_xchar(tty, STOP_CHAR(tty)); 1030} 1031 1032 1033static void scc_unthrottle (struct tty_struct * tty) 1034{ 1035 struct scc_port *port = tty->driver_data; 1036 unsigned long flags; 1037 SCC_ACCESS_INIT(port); 1038 1039 if (tty->termios->c_cflag & CRTSCTS) { 1040 local_irq_save(flags); 1041 SCCmod(TX_CTRL_REG, 0xff, TCR_RTS); 1042 local_irq_restore(flags); 1043 } 1044 if (I_IXOFF(tty)) 1045 scc_send_xchar(tty, START_CHAR(tty)); 1046} 1047 1048 1049static int scc_ioctl(struct tty_struct *tty, struct file *file, 1050 unsigned int cmd, unsigned long arg) 1051{ 1052 return -ENOIOCTLCMD; 1053} 1054 1055 1056static int scc_break_ctl(struct tty_struct *tty, int break_state) 1057{ 1058 struct scc_port *port = tty->driver_data; 1059 unsigned long flags; 1060 SCC_ACCESS_INIT(port); 1061 1062 local_irq_save(flags); 1063 SCCmod(TX_CTRL_REG, ~TCR_SEND_BREAK, 1064 break_state ? TCR_SEND_BREAK : 0); 1065 local_irq_restore(flags); 1066 return 0; 1067} 1068 1069 1070/*--------------------------------------------------------------------------- 1071 * Serial console stuff... 1072 *--------------------------------------------------------------------------*/ 1073 1074#define scc_delay() do { __asm__ __volatile__ (" nop; nop"); } while (0) 1075 1076static void scc_ch_write (char ch) 1077{ 1078 volatile char *p = NULL; 1079 1080#ifdef CONFIG_MVME147_SCC 1081 if (MACH_IS_MVME147) 1082 p = (volatile char *)M147_SCC_A_ADDR; 1083#endif 1084#ifdef CONFIG_MVME162_SCC 1085 if (MACH_IS_MVME16x) 1086 p = (volatile char *)MVME_SCC_A_ADDR; 1087#endif 1088#ifdef CONFIG_BVME6000_SCC 1089 if (MACH_IS_BVME6000) 1090 p = (volatile char *)BVME_SCC_A_ADDR; 1091#endif 1092 1093 do { 1094 scc_delay(); 1095 } 1096 while (!(*p & 4)); 1097 scc_delay(); 1098 *p = 8; 1099 scc_delay(); 1100 *p = ch; 1101} 1102 1103/* The console must be locked when we get here. */ 1104 1105static void scc_console_write (struct console *co, const char *str, unsigned count) 1106{ 1107 unsigned long flags; 1108 1109 local_irq_save(flags); 1110 1111 while (count--) 1112 { 1113 if (*str == '\n') 1114 scc_ch_write ('\r'); 1115 scc_ch_write (*str++); 1116 } 1117 local_irq_restore(flags); 1118} 1119 1120static struct tty_driver *scc_console_device(struct console *c, int *index) 1121{ 1122 *index = c->index; 1123 return scc_driver; 1124} 1125 1126static struct console sercons = { 1127 .name = "ttyS", 1128 .write = scc_console_write, 1129 .device = scc_console_device, 1130 .flags = CON_PRINTBUFFER, 1131 .index = -1, 1132}; 1133 1134 1135static int __init vme_scc_console_init(void) 1136{ 1137 if (vme_brdtype == VME_TYPE_MVME147 || 1138 vme_brdtype == VME_TYPE_MVME162 || 1139 vme_brdtype == VME_TYPE_MVME172 || 1140 vme_brdtype == VME_TYPE_BVME4000 || 1141 vme_brdtype == VME_TYPE_BVME6000) 1142 register_console(&sercons); 1143 return 0; 1144} 1145console_initcall(vme_scc_console_init); 1146