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