drivers/char/vme_scc.c

   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 */
  57 static unsigned char scc_shadow[2][16];
  58
  59 /* Location to access for SCC register access delay */
  60 static volatile unsigned char *scc_del = NULL;
  61
  62 /* To keep track of STATUS_REG state for detection of Ext/Status int source */
  63 static unsigned char scc_last_status_reg[2];
  64
  65 /***************************** Prototypes *****************************/
  66
  67 /* Function prototypes */
  68 static void scc_disable_tx_interrupts(void * ptr);
  69 static void scc_enable_tx_interrupts(void * ptr);
  70 static void scc_disable_rx_interrupts(void * ptr);
  71 static void scc_enable_rx_interrupts(void * ptr);
  72 static int  scc_get_CD(void * ptr);
  73 static void scc_shutdown_port(void * ptr);
  74 static int scc_set_real_termios(void  *ptr);
  75 static void scc_hungup(void  *ptr);
  76 static void scc_close(void  *ptr);
  77 static int scc_chars_in_buffer(void * ptr);
  78 static int scc_open(struct tty_struct * tty, struct file * filp);
  79 static int scc_ioctl(struct tty_struct * tty, struct file * filp,
  80                      unsigned int cmd, unsigned long arg);
  81 static void scc_throttle(struct tty_struct *tty);
  82 static void scc_unthrottle(struct tty_struct *tty);
  83 static irqreturn_t scc_tx_int(int irq, void *data);
  84 static irqreturn_t scc_rx_int(int irq, void *data);
  85 static irqreturn_t scc_stat_int(int irq, void *data);
  86 static irqreturn_t scc_spcond_int(int irq, void *data);
  87 static void scc_setsignals(struct scc_port *port, int dtr, int rts);
  88 static void scc_break_ctl(struct tty_struct *tty, int break_state);
  89
  90 static struct tty_driver *scc_driver;
  91
  92 struct scc_port scc_ports[2];
  93
  94 int scc_initialized = 0;
  95
  96 /*---------------------------------------------------------------------------
  97  * Interface from generic_serial.c back here
  98  *--------------------------------------------------------------------------*/
  99
 100 static 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
 115 static 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
 138 static 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
 174 static 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
 195 static 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
 262 static 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
 333 static 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
 397 static 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
 416 module_init(vme_scc_init);
 417
 418
 419 /*---------------------------------------------------------------------------
 420  * Interrupt handlers
 421  *--------------------------------------------------------------------------*/
 422
 423 static 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
 455 static 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
 500 static 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
 542 static 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
 575 static 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
 588 static 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
 602 static 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
 615 static 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
 628 static 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
 637 static 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
 648 static 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
 730 static 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
 748 static void scc_hungup(void *ptr)
 749 {
 750         scc_disable_tx_interrupts(ptr);
 751         scc_disable_rx_interrupts(ptr);
 752 }
 753
 754
 755 static 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
 766 static 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
 781 static 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
 795 static 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
 908 static 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
 924 static 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
 940 static int scc_ioctl(struct tty_struct *tty, struct file *file,
 941                      unsigned int cmd, unsigned long arg)
 942 {
 943         return -ENOIOCTLCMD;
 944 }
 945
 946
 947 static 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
 966 static 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
 995 static 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
1010 static struct tty_driver *scc_console_device(struct console *c, int *index)
1011 {
1012         *index = c->index;
1013         return scc_driver;
1014 }
1015
1016 static struct console sercons = {
1017         .name           = "ttyS",
1018         .write          = scc_console_write,
1019         .device         = scc_console_device,
1020         .flags          = CON_PRINTBUFFER,
1021         .index          = -1,
1022 };
1023
1024
1025 static int __init vme_scc_console_init(void)
1026 {
1027         if (vme_brdtype == VME_TYPE_MVME147 ||
1028                         vme_brdtype == VME_TYPE_MVME162 ||
1029                         vme_brdtype == VME_TYPE_MVME172 ||
1030                         vme_brdtype == VME_TYPE_BVME4000 ||
1031                         vme_brdtype == VME_TYPE_BVME6000)
1032                 register_console(&sercons);
1033         return 0;
1034 }
1035 console_initcall(vme_scc_console_init);