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 int scc_break_ctl(struct tty_struct *tty, int break_state);
  89
  90 static struct tty_driver *scc_driver;
  91
  92 static struct scc_port scc_ports[2];
  93
  94 /*---------------------------------------------------------------------------
  95  * Interface from generic_serial.c back here
  96  *--------------------------------------------------------------------------*/
  97
  98 static struct real_driver scc_real_driver = {
  99         scc_disable_tx_interrupts,
 100         scc_enable_tx_interrupts,
 101         scc_disable_rx_interrupts,
 102         scc_enable_rx_interrupts,
 103         scc_get_CD,
 104         scc_shutdown_port,
 105         scc_set_real_termios,
 106         scc_chars_in_buffer,
 107         scc_close,
 108         scc_hungup,
 109         NULL
 110 };
 111
 112
 113 static const struct tty_operations scc_ops = {
 114         .open   = scc_open,
 115         .close = gs_close,
 116         .write = gs_write,
 117         .put_char = gs_put_char,
 118         .flush_chars = gs_flush_chars,
 119         .write_room = gs_write_room,
 120         .chars_in_buffer = gs_chars_in_buffer,
 121         .flush_buffer = gs_flush_buffer,
 122         .ioctl = scc_ioctl,
 123         .throttle = scc_throttle,
 124         .unthrottle = scc_unthrottle,
 125         .set_termios = gs_set_termios,
 126         .stop = gs_stop,
 127         .start = gs_start,
 128         .hangup = gs_hangup,
 129         .break_ctl = scc_break_ctl,
 130 };
 131
 132 /*----------------------------------------------------------------------------
 133  * vme_scc_init() and support functions
 134  *---------------------------------------------------------------------------*/
 135
 136 static int scc_init_drivers(void)
 137 {
 138         int error;
 139
 140         scc_driver = alloc_tty_driver(2);
 141         if (!scc_driver)
 142                 return -ENOMEM;
 143         scc_driver->owner = THIS_MODULE;
 144         scc_driver->driver_name = "scc";
 145         scc_driver->name = "ttyS";
 146         scc_driver->major = TTY_MAJOR;
 147         scc_driver->minor_start = SCC_MINOR_BASE;
 148         scc_driver->type = TTY_DRIVER_TYPE_SERIAL;
 149         scc_driver->subtype = SERIAL_TYPE_NORMAL;
 150         scc_driver->init_termios = tty_std_termios;
 151         scc_driver->init_termios.c_cflag =
 152           B9600 | CS8 | CREAD | HUPCL | CLOCAL;
 153         scc_driver->init_termios.c_ispeed = 9600;
 154         scc_driver->init_termios.c_ospeed = 9600;
 155         scc_driver->flags = TTY_DRIVER_REAL_RAW;
 156         tty_set_operations(scc_driver, &scc_ops);
 157
 158         if ((error = tty_register_driver(scc_driver))) {
 159                 printk(KERN_ERR "scc: Couldn't register scc driver, error = %d\n",
 160                        error);
 161                 put_tty_driver(scc_driver);
 162                 return 1;
 163         }
 164
 165         return 0;
 166 }
 167
 168
 169 /* ports[] array is indexed by line no (i.e. [0] for ttyS0, [1] for ttyS1).
 170  */
 171
 172 static void scc_init_portstructs(void)
 173 {
 174         struct scc_port *port;
 175         int i;
 176
 177         for (i = 0; i < 2; i++) {
 178                 port = scc_ports + i;
 179                 port->gs.magic = SCC_MAGIC;
 180                 port->gs.close_delay = HZ/2;
 181                 port->gs.closing_wait = 30 * HZ;
 182                 port->gs.rd = &scc_real_driver;
 183 #ifdef NEW_WRITE_LOCKING
 184                 port->gs.port_write_mutex = MUTEX;
 185 #endif
 186                 init_waitqueue_head(&port->gs.port.open_wait);
 187                 init_waitqueue_head(&port->gs.port.close_wait);
 188         }
 189 }
 190
 191
 192 #ifdef CONFIG_MVME147_SCC
 193 static int mvme147_scc_init(void)
 194 {
 195         struct scc_port *port;
 196
 197         printk(KERN_INFO "SCC: MVME147 Serial Driver\n");
 198         /* Init channel A */
 199         port = &scc_ports[0];
 200         port->channel = CHANNEL_A;
 201         port->ctrlp = (volatile unsigned char *)M147_SCC_A_ADDR;
 202         port->datap = port->ctrlp + 1;
 203         port->port_a = &scc_ports[0];
 204         port->port_b = &scc_ports[1];
 205         request_irq(MVME147_IRQ_SCCA_TX, scc_tx_int, IRQF_DISABLED,
 206                             "SCC-A TX", port);
 207         request_irq(MVME147_IRQ_SCCA_STAT, scc_stat_int, IRQF_DISABLED,
 208                             "SCC-A status", port);
 209         request_irq(MVME147_IRQ_SCCA_RX, scc_rx_int, IRQF_DISABLED,
 210                             "SCC-A RX", port);
 211         request_irq(MVME147_IRQ_SCCA_SPCOND, scc_spcond_int, IRQF_DISABLED,
 212                             "SCC-A special cond", port);
 213         {
 214                 SCC_ACCESS_INIT(port);
 215
 216                 /* disable interrupts for this channel */
 217                 SCCwrite(INT_AND_DMA_REG, 0);
 218                 /* Set the interrupt vector */
 219                 SCCwrite(INT_VECTOR_REG, MVME147_IRQ_SCC_BASE);
 220                 /* Interrupt parameters: vector includes status, status low */
 221                 SCCwrite(MASTER_INT_CTRL, MIC_VEC_INCL_STAT);
 222                 SCCmod(MASTER_INT_CTRL, 0xff, MIC_MASTER_INT_ENAB);
 223         }
 224
 225         /* Init channel B */
 226         port = &scc_ports[1];
 227         port->channel = CHANNEL_B;
 228         port->ctrlp = (volatile unsigned char *)M147_SCC_B_ADDR;
 229         port->datap = port->ctrlp + 1;
 230         port->port_a = &scc_ports[0];
 231         port->port_b = &scc_ports[1];
 232         request_irq(MVME147_IRQ_SCCB_TX, scc_tx_int, IRQF_DISABLED,
 233                             "SCC-B TX", port);
 234         request_irq(MVME147_IRQ_SCCB_STAT, scc_stat_int, IRQF_DISABLED,
 235                             "SCC-B status", port);
 236         request_irq(MVME147_IRQ_SCCB_RX, scc_rx_int, IRQF_DISABLED,
 237                             "SCC-B RX", port);
 238         request_irq(MVME147_IRQ_SCCB_SPCOND, scc_spcond_int, IRQF_DISABLED,
 239                             "SCC-B special cond", port);
 240         {
 241                 SCC_ACCESS_INIT(port);
 242
 243                 /* disable interrupts for this channel */
 244                 SCCwrite(INT_AND_DMA_REG, 0);
 245         }
 246
 247         /* Ensure interrupts are enabled in the PCC chip */
 248         m147_pcc->serial_cntrl=PCC_LEVEL_SERIAL|PCC_INT_ENAB;
 249
 250         /* Initialise the tty driver structures and register */
 251         scc_init_portstructs();
 252         scc_init_drivers();
 253
 254         return 0;
 255 }
 256 #endif
 257
 258
 259 #ifdef CONFIG_MVME162_SCC
 260 static int mvme162_scc_init(void)
 261 {
 262         struct scc_port *port;
 263
 264         if (!(mvme16x_config & MVME16x_CONFIG_GOT_SCCA))
 265                 return (-ENODEV);
 266
 267         printk(KERN_INFO "SCC: MVME162 Serial Driver\n");
 268         /* Init channel A */
 269         port = &scc_ports[0];
 270         port->channel = CHANNEL_A;
 271         port->ctrlp = (volatile unsigned char *)MVME_SCC_A_ADDR;
 272         port->datap = port->ctrlp + 2;
 273         port->port_a = &scc_ports[0];
 274         port->port_b = &scc_ports[1];
 275         request_irq(MVME162_IRQ_SCCA_TX, scc_tx_int, IRQF_DISABLED,
 276                             "SCC-A TX", port);
 277         request_irq(MVME162_IRQ_SCCA_STAT, scc_stat_int, IRQF_DISABLED,
 278                             "SCC-A status", port);
 279         request_irq(MVME162_IRQ_SCCA_RX, scc_rx_int, IRQF_DISABLED,
 280                             "SCC-A RX", port);
 281         request_irq(MVME162_IRQ_SCCA_SPCOND, scc_spcond_int, IRQF_DISABLED,
 282                             "SCC-A special cond", port);
 283         {
 284                 SCC_ACCESS_INIT(port);
 285
 286                 /* disable interrupts for this channel */
 287                 SCCwrite(INT_AND_DMA_REG, 0);
 288                 /* Set the interrupt vector */
 289                 SCCwrite(INT_VECTOR_REG, MVME162_IRQ_SCC_BASE);
 290                 /* Interrupt parameters: vector includes status, status low */
 291                 SCCwrite(MASTER_INT_CTRL, MIC_VEC_INCL_STAT);
 292                 SCCmod(MASTER_INT_CTRL, 0xff, MIC_MASTER_INT_ENAB);
 293         }
 294
 295         /* Init channel B */
 296         port = &scc_ports[1];
 297         port->channel = CHANNEL_B;
 298         port->ctrlp = (volatile unsigned char *)MVME_SCC_B_ADDR;
 299         port->datap = port->ctrlp + 2;
 300         port->port_a = &scc_ports[0];
 301         port->port_b = &scc_ports[1];
 302         request_irq(MVME162_IRQ_SCCB_TX, scc_tx_int, IRQF_DISABLED,
 303                             "SCC-B TX", port);
 304         request_irq(MVME162_IRQ_SCCB_STAT, scc_stat_int, IRQF_DISABLED,
 305                             "SCC-B status", port);
 306         request_irq(MVME162_IRQ_SCCB_RX, scc_rx_int, IRQF_DISABLED,
 307                             "SCC-B RX", port);
 308         request_irq(MVME162_IRQ_SCCB_SPCOND, scc_spcond_int, IRQF_DISABLED,
 309                             "SCC-B special cond", port);
 310
 311         {
 312                 SCC_ACCESS_INIT(port);  /* Either channel will do */
 313
 314                 /* disable interrupts for this channel */
 315                 SCCwrite(INT_AND_DMA_REG, 0);
 316         }
 317
 318         /* Ensure interrupts are enabled in the MC2 chip */
 319         *(volatile char *)0xfff4201d = 0x14;
 320
 321         /* Initialise the tty driver structures and register */
 322         scc_init_portstructs();
 323         scc_init_drivers();
 324
 325         return 0;
 326 }
 327 #endif
 328
 329
 330 #ifdef CONFIG_BVME6000_SCC
 331 static int bvme6000_scc_init(void)
 332 {
 333         struct scc_port *port;
 334
 335         printk(KERN_INFO "SCC: BVME6000 Serial Driver\n");
 336         /* Init channel A */
 337         port = &scc_ports[0];
 338         port->channel = CHANNEL_A;
 339         port->ctrlp = (volatile unsigned char *)BVME_SCC_A_ADDR;
 340         port->datap = port->ctrlp + 4;
 341         port->port_a = &scc_ports[0];
 342         port->port_b = &scc_ports[1];
 343         request_irq(BVME_IRQ_SCCA_TX, scc_tx_int, IRQF_DISABLED,
 344                             "SCC-A TX", port);
 345         request_irq(BVME_IRQ_SCCA_STAT, scc_stat_int, IRQF_DISABLED,
 346                             "SCC-A status", port);
 347         request_irq(BVME_IRQ_SCCA_RX, scc_rx_int, IRQF_DISABLED,
 348                             "SCC-A RX", port);
 349         request_irq(BVME_IRQ_SCCA_SPCOND, scc_spcond_int, IRQF_DISABLED,
 350                             "SCC-A special cond", port);
 351         {
 352                 SCC_ACCESS_INIT(port);
 353
 354                 /* disable interrupts for this channel */
 355                 SCCwrite(INT_AND_DMA_REG, 0);
 356                 /* Set the interrupt vector */
 357                 SCCwrite(INT_VECTOR_REG, BVME_IRQ_SCC_BASE);
 358                 /* Interrupt parameters: vector includes status, status low */
 359                 SCCwrite(MASTER_INT_CTRL, MIC_VEC_INCL_STAT);
 360                 SCCmod(MASTER_INT_CTRL, 0xff, MIC_MASTER_INT_ENAB);
 361         }
 362
 363         /* Init channel B */
 364         port = &scc_ports[1];
 365         port->channel = CHANNEL_B;
 366         port->ctrlp = (volatile unsigned char *)BVME_SCC_B_ADDR;
 367         port->datap = port->ctrlp + 4;
 368         port->port_a = &scc_ports[0];
 369         port->port_b = &scc_ports[1];
 370         request_irq(BVME_IRQ_SCCB_TX, scc_tx_int, IRQF_DISABLED,
 371                             "SCC-B TX", port);
 372         request_irq(BVME_IRQ_SCCB_STAT, scc_stat_int, IRQF_DISABLED,
 373                             "SCC-B status", port);
 374         request_irq(BVME_IRQ_SCCB_RX, scc_rx_int, IRQF_DISABLED,
 375                             "SCC-B RX", port);
 376         request_irq(BVME_IRQ_SCCB_SPCOND, scc_spcond_int, IRQF_DISABLED,
 377                             "SCC-B special cond", port);
 378
 379         {
 380                 SCC_ACCESS_INIT(port);  /* Either channel will do */
 381
 382                 /* disable interrupts for this channel */
 383                 SCCwrite(INT_AND_DMA_REG, 0);
 384         }
 385
 386         /* Initialise the tty driver structures and register */
 387         scc_init_portstructs();
 388         scc_init_drivers();
 389
 390         return 0;
 391 }
 392 #endif
 393
 394
 395 static int vme_scc_init(void)
 396 {
 397         int res = -ENODEV;
 398
 399 #ifdef CONFIG_MVME147_SCC
 400         if (MACH_IS_MVME147)
 401                 res = mvme147_scc_init();
 402 #endif
 403 #ifdef CONFIG_MVME162_SCC
 404         if (MACH_IS_MVME16x)
 405                 res = mvme162_scc_init();
 406 #endif
 407 #ifdef CONFIG_BVME6000_SCC
 408         if (MACH_IS_BVME6000)
 409                 res = bvme6000_scc_init();
 410 #endif
 411         return res;
 412 }
 413
 414 module_init(vme_scc_init);
 415
 416
 417 /*---------------------------------------------------------------------------
 418  * Interrupt handlers
 419  *--------------------------------------------------------------------------*/
 420
 421 static irqreturn_t scc_rx_int(int irq, void *data)
 422 {
 423         unsigned char   ch;
 424         struct scc_port *port = data;
 425         struct tty_struct *tty = port->gs.port.tty;
 426         SCC_ACCESS_INIT(port);
 427
 428         ch = SCCread_NB(RX_DATA_REG);
 429         if (!tty) {
 430                 printk(KERN_WARNING "scc_rx_int with NULL tty!\n");
 431                 SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
 432                 return IRQ_HANDLED;
 433         }
 434         tty_insert_flip_char(tty, ch, 0);
 435
 436         /* Check if another character is already ready; in that case, the
 437          * spcond_int() function must be used, because this character may have an
 438          * error condition that isn't signalled by the interrupt vector used!
 439          */
 440         if (SCCread(INT_PENDING_REG) &
 441             (port->channel == CHANNEL_A ? IPR_A_RX : IPR_B_RX)) {
 442                 scc_spcond_int (irq, data);
 443                 return IRQ_HANDLED;
 444         }
 445
 446         SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
 447
 448         tty_flip_buffer_push(tty);
 449         return IRQ_HANDLED;
 450 }
 451
 452
 453 static irqreturn_t scc_spcond_int(int irq, void *data)
 454 {
 455         struct scc_port *port = data;
 456         struct tty_struct *tty = port->gs.port.tty;
 457         unsigned char   stat, ch, err;
 458         int             int_pending_mask = port->channel == CHANNEL_A ?
 459                                            IPR_A_RX : IPR_B_RX;
 460         SCC_ACCESS_INIT(port);
 461
 462         if (!tty) {
 463                 printk(KERN_WARNING "scc_spcond_int with NULL tty!\n");
 464                 SCCwrite(COMMAND_REG, CR_ERROR_RESET);
 465                 SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
 466                 return IRQ_HANDLED;
 467         }
 468         do {
 469                 stat = SCCread(SPCOND_STATUS_REG);
 470                 ch = SCCread_NB(RX_DATA_REG);
 471
 472                 if (stat & SCSR_RX_OVERRUN)
 473                         err = TTY_OVERRUN;
 474                 else if (stat & SCSR_PARITY_ERR)
 475                         err = TTY_PARITY;
 476                 else if (stat & SCSR_CRC_FRAME_ERR)
 477                         err = TTY_FRAME;
 478                 else
 479                         err = 0;
 480
 481                 tty_insert_flip_char(tty, ch, err);
 482
 483                 /* ++TeSche: *All* errors have to be cleared manually,
 484                  * else the condition persists for the next chars
 485                  */
 486                 if (err)
 487                   SCCwrite(COMMAND_REG, CR_ERROR_RESET);
 488
 489         } while(SCCread(INT_PENDING_REG) & int_pending_mask);
 490
 491         SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
 492
 493         tty_flip_buffer_push(tty);
 494         return IRQ_HANDLED;
 495 }
 496
 497
 498 static irqreturn_t scc_tx_int(int irq, void *data)
 499 {
 500         struct scc_port *port = data;
 501         SCC_ACCESS_INIT(port);
 502
 503         if (!port->gs.port.tty) {
 504                 printk(KERN_WARNING "scc_tx_int with NULL tty!\n");
 505                 SCCmod (INT_AND_DMA_REG, ~IDR_TX_INT_ENAB, 0);
 506                 SCCwrite(COMMAND_REG, CR_TX_PENDING_RESET);
 507                 SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
 508                 return IRQ_HANDLED;
 509         }
 510         while ((SCCread_NB(STATUS_REG) & SR_TX_BUF_EMPTY)) {
 511                 if (port->x_char) {
 512                         SCCwrite(TX_DATA_REG, port->x_char);
 513                         port->x_char = 0;
 514                 }
 515                 else if ((port->gs.xmit_cnt <= 0) ||
 516                          port->gs.port.tty->stopped ||
 517                          port->gs.port.tty->hw_stopped)
 518                         break;
 519                 else {
 520                         SCCwrite(TX_DATA_REG, port->gs.xmit_buf[port->gs.xmit_tail++]);
 521                         port->gs.xmit_tail = port->gs.xmit_tail & (SERIAL_XMIT_SIZE-1);
 522                         if (--port->gs.xmit_cnt <= 0)
 523                                 break;
 524                 }
 525         }
 526         if ((port->gs.xmit_cnt <= 0) || port->gs.port.tty->stopped ||
 527             port->gs.port.tty->hw_stopped) {
 528                 /* disable tx interrupts */
 529                 SCCmod (INT_AND_DMA_REG, ~IDR_TX_INT_ENAB, 0);
 530                 SCCwrite(COMMAND_REG, CR_TX_PENDING_RESET);   /* disable tx_int on next tx underrun? */
 531                 port->gs.port.flags &= ~GS_TX_INTEN;
 532         }
 533         if (port->gs.port.tty && port->gs.xmit_cnt <= port->gs.wakeup_chars)
 534                 tty_wakeup(port->gs.port.tty);
 535
 536         SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
 537         return IRQ_HANDLED;
 538 }
 539
 540
 541 static irqreturn_t scc_stat_int(int irq, void *data)
 542 {
 543         struct scc_port *port = data;
 544         unsigned channel = port->channel;
 545         unsigned char   last_sr, sr, changed;
 546         SCC_ACCESS_INIT(port);
 547
 548         last_sr = scc_last_status_reg[channel];
 549         sr = scc_last_status_reg[channel] = SCCread_NB(STATUS_REG);
 550         changed = last_sr ^ sr;
 551
 552         if (changed & SR_DCD) {
 553                 port->c_dcd = !!(sr & SR_DCD);
 554                 if (!(port->gs.port.flags & ASYNC_CHECK_CD))
 555                         ;       /* Don't report DCD changes */
 556                 else if (port->c_dcd) {
 557                         wake_up_interruptible(&port->gs.port.open_wait);
 558                 }
 559                 else {
 560                         if (port->gs.port.tty)
 561                                 tty_hangup (port->gs.port.tty);
 562                 }
 563         }
 564         SCCwrite(COMMAND_REG, CR_EXTSTAT_RESET);
 565         SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
 566         return IRQ_HANDLED;
 567 }
 568
 569
 570 /*---------------------------------------------------------------------------
 571  * generic_serial.c callback funtions
 572  *--------------------------------------------------------------------------*/
 573
 574 static void scc_disable_tx_interrupts(void *ptr)
 575 {
 576         struct scc_port *port = ptr;
 577         unsigned long   flags;
 578         SCC_ACCESS_INIT(port);
 579
 580         local_irq_save(flags);
 581         SCCmod(INT_AND_DMA_REG, ~IDR_TX_INT_ENAB, 0);
 582         port->gs.port.flags &= ~GS_TX_INTEN;
 583         local_irq_restore(flags);
 584 }
 585
 586
 587 static void scc_enable_tx_interrupts(void *ptr)
 588 {
 589         struct scc_port *port = ptr;
 590         unsigned long   flags;
 591         SCC_ACCESS_INIT(port);
 592
 593         local_irq_save(flags);
 594         SCCmod(INT_AND_DMA_REG, 0xff, IDR_TX_INT_ENAB);
 595         /* restart the transmitter */
 596         scc_tx_int (0, port);
 597         local_irq_restore(flags);
 598 }
 599
 600
 601 static void scc_disable_rx_interrupts(void *ptr)
 602 {
 603         struct scc_port *port = ptr;
 604         unsigned long   flags;
 605         SCC_ACCESS_INIT(port);
 606
 607         local_irq_save(flags);
 608         SCCmod(INT_AND_DMA_REG,
 609             ~(IDR_RX_INT_MASK|IDR_PARERR_AS_SPCOND|IDR_EXTSTAT_INT_ENAB), 0);
 610         local_irq_restore(flags);
 611 }
 612
 613
 614 static void scc_enable_rx_interrupts(void *ptr)
 615 {
 616         struct scc_port *port = ptr;
 617         unsigned long   flags;
 618         SCC_ACCESS_INIT(port);
 619
 620         local_irq_save(flags);
 621         SCCmod(INT_AND_DMA_REG, 0xff,
 622                 IDR_EXTSTAT_INT_ENAB|IDR_PARERR_AS_SPCOND|IDR_RX_INT_ALL);
 623         local_irq_restore(flags);
 624 }
 625
 626
 627 static int scc_get_CD(void *ptr)
 628 {
 629         struct scc_port *port = ptr;
 630         unsigned channel = port->channel;
 631
 632         return !!(scc_last_status_reg[channel] & SR_DCD);
 633 }
 634
 635
 636 static void scc_shutdown_port(void *ptr)
 637 {
 638         struct scc_port *port = ptr;
 639
 640         port->gs.port.flags &= ~ GS_ACTIVE;
 641         if (port->gs.port.tty && port->gs.port.tty->termios->c_cflag & HUPCL) {
 642                 scc_setsignals (port, 0, 0);
 643         }
 644 }
 645
 646
 647 static int scc_set_real_termios (void *ptr)
 648 {
 649         /* the SCC has char sizes 5,7,6,8 in that order! */
 650         static int chsize_map[4] = { 0, 2, 1, 3 };
 651         unsigned cflag, baud, chsize, channel, brgval = 0;
 652         unsigned long flags;
 653         struct scc_port *port = ptr;
 654         SCC_ACCESS_INIT(port);
 655
 656         if (!port->gs.port.tty || !port->gs.port.tty->termios) return 0;
 657
 658         channel = port->channel;
 659
 660         if (channel == CHANNEL_A)
 661                 return 0;               /* Settings controlled by boot PROM */
 662
 663         cflag  = port->gs.port.tty->termios->c_cflag;
 664         baud = port->gs.baud;
 665         chsize = (cflag & CSIZE) >> 4;
 666
 667         if (baud == 0) {
 668                 /* speed == 0 -> drop DTR */
 669                 local_irq_save(flags);
 670                 SCCmod(TX_CTRL_REG, ~TCR_DTR, 0);
 671                 local_irq_restore(flags);
 672                 return 0;
 673         }
 674         else if ((MACH_IS_MVME16x && (baud < 50 || baud > 38400)) ||
 675                  (MACH_IS_MVME147 && (baud < 50 || baud > 19200)) ||
 676                  (MACH_IS_BVME6000 &&(baud < 50 || baud > 76800))) {
 677                 printk(KERN_NOTICE "SCC: Bad speed requested, %d\n", baud);
 678                 return 0;
 679         }
 680
 681         if (cflag & CLOCAL)
 682                 port->gs.port.flags &= ~ASYNC_CHECK_CD;
 683         else
 684                 port->gs.port.flags |= ASYNC_CHECK_CD;
 685
 686 #ifdef CONFIG_MVME147_SCC
 687         if (MACH_IS_MVME147)
 688                 brgval = (M147_SCC_PCLK + baud/2) / (16 * 2 * baud) - 2;
 689 #endif
 690 #ifdef CONFIG_MVME162_SCC
 691         if (MACH_IS_MVME16x)
 692                 brgval = (MVME_SCC_PCLK + baud/2) / (16 * 2 * baud) - 2;
 693 #endif
 694 #ifdef CONFIG_BVME6000_SCC
 695         if (MACH_IS_BVME6000)
 696                 brgval = (BVME_SCC_RTxC + baud/2) / (16 * 2 * baud) - 2;
 697 #endif
 698         /* Now we have all parameters and can go to set them: */
 699         local_irq_save(flags);
 700
 701         /* receiver's character size and auto-enables */
 702         SCCmod(RX_CTRL_REG, ~(RCR_CHSIZE_MASK|RCR_AUTO_ENAB_MODE),
 703                         (chsize_map[chsize] << 6) |
 704                         ((cflag & CRTSCTS) ? RCR_AUTO_ENAB_MODE : 0));
 705         /* parity and stop bits (both, Tx and Rx), clock mode never changes */
 706         SCCmod (AUX1_CTRL_REG,
 707                 ~(A1CR_PARITY_MASK | A1CR_MODE_MASK),
 708                 ((cflag & PARENB
 709                   ? (cflag & PARODD ? A1CR_PARITY_ODD : A1CR_PARITY_EVEN)
 710                   : A1CR_PARITY_NONE)
 711                  | (cflag & CSTOPB ? A1CR_MODE_ASYNC_2 : A1CR_MODE_ASYNC_1)));
 712         /* sender's character size, set DTR for valid baud rate */
 713         SCCmod(TX_CTRL_REG, ~TCR_CHSIZE_MASK, chsize_map[chsize] << 5 | TCR_DTR);
 714         /* clock sources never change */
 715         /* disable BRG before changing the value */
 716         SCCmod(DPLL_CTRL_REG, ~DCR_BRG_ENAB, 0);
 717         /* BRG value */
 718         SCCwrite(TIMER_LOW_REG, brgval & 0xff);
 719         SCCwrite(TIMER_HIGH_REG, (brgval >> 8) & 0xff);
 720         /* BRG enable, and clock source never changes */
 721         SCCmod(DPLL_CTRL_REG, 0xff, DCR_BRG_ENAB);
 722
 723         local_irq_restore(flags);
 724
 725         return 0;
 726 }
 727
 728
 729 static int scc_chars_in_buffer (void *ptr)
 730 {
 731         struct scc_port *port = ptr;
 732         SCC_ACCESS_INIT(port);
 733
 734         return (SCCread (SPCOND_STATUS_REG) & SCSR_ALL_SENT) ? 0  : 1;
 735 }
 736
 737
 738 /* Comment taken from sx.c (2.4.0):
 739    I haven't the foggiest why the decrement use count has to happen
 740    here. The whole linux serial drivers stuff needs to be redesigned.
 741    My guess is that this is a hack to minimize the impact of a bug
 742    elsewhere. Thinking about it some more. (try it sometime) Try
 743    running minicom on a serial port that is driven by a modularized
 744    driver. Have the modem hangup. Then remove the driver module. Then
 745    exit minicom.  I expect an "oops".  -- REW */
 746
 747 static void scc_hungup(void *ptr)
 748 {
 749         scc_disable_tx_interrupts(ptr);
 750         scc_disable_rx_interrupts(ptr);
 751 }
 752
 753
 754 static void scc_close(void *ptr)
 755 {
 756         scc_disable_tx_interrupts(ptr);
 757         scc_disable_rx_interrupts(ptr);
 758 }
 759
 760
 761 /*---------------------------------------------------------------------------
 762  * Internal support functions
 763  *--------------------------------------------------------------------------*/
 764
 765 static void scc_setsignals(struct scc_port *port, int dtr, int rts)
 766 {
 767         unsigned long flags;
 768         unsigned char t;
 769         SCC_ACCESS_INIT(port);
 770
 771         local_irq_save(flags);
 772         t = SCCread(TX_CTRL_REG);
 773         if (dtr >= 0) t = dtr? (t | TCR_DTR): (t & ~TCR_DTR);
 774         if (rts >= 0) t = rts? (t | TCR_RTS): (t & ~TCR_RTS);
 775         SCCwrite(TX_CTRL_REG, t);
 776         local_irq_restore(flags);
 777 }
 778
 779
 780 static void scc_send_xchar(struct tty_struct *tty, char ch)
 781 {
 782         struct scc_port *port = (struct scc_port *)tty->driver_data;
 783
 784         port->x_char = ch;
 785         if (ch)
 786                 scc_enable_tx_interrupts(port);
 787 }
 788
 789
 790 /*---------------------------------------------------------------------------
 791  * Driver entrypoints referenced from above
 792  *--------------------------------------------------------------------------*/
 793
 794 static int scc_open (struct tty_struct * tty, struct file * filp)
 795 {
 796         int line = tty->index;
 797         int retval;
 798         struct scc_port *port = &scc_ports[line];
 799         int i, channel = port->channel;
 800         unsigned long   flags;
 801         SCC_ACCESS_INIT(port);
 802 #if defined(CONFIG_MVME162_SCC) || defined(CONFIG_MVME147_SCC)
 803         static const struct {
 804                 unsigned reg, val;
 805         } mvme_init_tab[] = {
 806                 /* Values for MVME162 and MVME147 */
 807                 /* no parity, 1 stop bit, async, 1:16 */
 808                 { AUX1_CTRL_REG, A1CR_PARITY_NONE|A1CR_MODE_ASYNC_1|A1CR_CLKMODE_x16 },
 809                 /* parity error is special cond, ints disabled, no DMA */
 810                 { INT_AND_DMA_REG, IDR_PARERR_AS_SPCOND | IDR_RX_INT_DISAB },
 811                 /* Rx 8 bits/char, no auto enable, Rx off */
 812                 { RX_CTRL_REG, RCR_CHSIZE_8 },
 813                 /* DTR off, Tx 8 bits/char, RTS off, Tx off */
 814                 { TX_CTRL_REG, TCR_CHSIZE_8 },
 815                 /* special features off */
 816                 { AUX2_CTRL_REG, 0 },
 817                 { CLK_CTRL_REG, CCR_RXCLK_BRG | CCR_TXCLK_BRG },
 818                 { DPLL_CTRL_REG, DCR_BRG_ENAB | DCR_BRG_USE_PCLK },
 819                 /* Start Rx */
 820                 { RX_CTRL_REG, RCR_RX_ENAB | RCR_CHSIZE_8 },
 821                 /* Start Tx */
 822                 { TX_CTRL_REG, TCR_TX_ENAB | TCR_RTS | TCR_DTR | TCR_CHSIZE_8 },
 823                 /* Ext/Stat ints: DCD only */
 824                 { INT_CTRL_REG, ICR_ENAB_DCD_INT },
 825                 /* Reset Ext/Stat ints */
 826                 { COMMAND_REG, CR_EXTSTAT_RESET },
 827                 /* ...again */
 828                 { COMMAND_REG, CR_EXTSTAT_RESET },
 829         };
 830 #endif
 831 #if defined(CONFIG_BVME6000_SCC)
 832         static const struct {
 833                 unsigned reg, val;
 834         } bvme_init_tab[] = {
 835                 /* Values for BVME6000 */
 836                 /* no parity, 1 stop bit, async, 1:16 */
 837                 { AUX1_CTRL_REG, A1CR_PARITY_NONE|A1CR_MODE_ASYNC_1|A1CR_CLKMODE_x16 },
 838                 /* parity error is special cond, ints disabled, no DMA */
 839                 { INT_AND_DMA_REG, IDR_PARERR_AS_SPCOND | IDR_RX_INT_DISAB },
 840                 /* Rx 8 bits/char, no auto enable, Rx off */
 841                 { RX_CTRL_REG, RCR_CHSIZE_8 },
 842                 /* DTR off, Tx 8 bits/char, RTS off, Tx off */
 843                 { TX_CTRL_REG, TCR_CHSIZE_8 },
 844                 /* special features off */
 845                 { AUX2_CTRL_REG, 0 },
 846                 { CLK_CTRL_REG, CCR_RTxC_XTAL | CCR_RXCLK_BRG | CCR_TXCLK_BRG },
 847                 { DPLL_CTRL_REG, DCR_BRG_ENAB },
 848                 /* Start Rx */
 849                 { RX_CTRL_REG, RCR_RX_ENAB | RCR_CHSIZE_8 },
 850                 /* Start Tx */
 851                 { TX_CTRL_REG, TCR_TX_ENAB | TCR_RTS | TCR_DTR | TCR_CHSIZE_8 },
 852                 /* Ext/Stat ints: DCD only */
 853                 { INT_CTRL_REG, ICR_ENAB_DCD_INT },
 854                 /* Reset Ext/Stat ints */
 855                 { COMMAND_REG, CR_EXTSTAT_RESET },
 856                 /* ...again */
 857                 { COMMAND_REG, CR_EXTSTAT_RESET },
 858         };
 859 #endif
 860         if (!(port->gs.port.flags & ASYNC_INITIALIZED)) {
 861                 local_irq_save(flags);
 862 #if defined(CONFIG_MVME147_SCC) || defined(CONFIG_MVME162_SCC)
 863                 if (MACH_IS_MVME147 || MACH_IS_MVME16x) {
 864                         for (i = 0; i < ARRAY_SIZE(mvme_init_tab); ++i)
 865                                 SCCwrite(mvme_init_tab[i].reg, mvme_init_tab[i].val);
 866                 }
 867 #endif
 868 #if defined(CONFIG_BVME6000_SCC)
 869                 if (MACH_IS_BVME6000) {
 870                         for (i = 0; i < ARRAY_SIZE(bvme_init_tab); ++i)
 871                                 SCCwrite(bvme_init_tab[i].reg, bvme_init_tab[i].val);
 872                 }
 873 #endif
 874
 875                 /* remember status register for detection of DCD and CTS changes */
 876                 scc_last_status_reg[channel] = SCCread(STATUS_REG);
 877
 878                 port->c_dcd = 0;        /* Prevent initial 1->0 interrupt */
 879                 scc_setsignals (port, 1,1);
 880                 local_irq_restore(flags);
 881         }
 882
 883         tty->driver_data = port;
 884         port->gs.port.tty = tty;
 885         port->gs.port.count++;
 886         retval = gs_init_port(&port->gs);
 887         if (retval) {
 888                 port->gs.port.count--;
 889                 return retval;
 890         }
 891         port->gs.port.flags |= GS_ACTIVE;
 892         retval = gs_block_til_ready(port, filp);
 893
 894         if (retval) {
 895                 port->gs.port.count--;
 896                 return retval;
 897         }
 898
 899         port->c_dcd = scc_get_CD (port);
 900
 901         scc_enable_rx_interrupts(port);
 902
 903         return 0;
 904 }
 905
 906
 907 static void scc_throttle (struct tty_struct * tty)
 908 {
 909         struct scc_port *port = (struct scc_port *)tty->driver_data;
 910         unsigned long   flags;
 911         SCC_ACCESS_INIT(port);
 912
 913         if (tty->termios->c_cflag & CRTSCTS) {
 914                 local_irq_save(flags);
 915                 SCCmod(TX_CTRL_REG, ~TCR_RTS, 0);
 916                 local_irq_restore(flags);
 917         }
 918         if (I_IXOFF(tty))
 919                 scc_send_xchar(tty, STOP_CHAR(tty));
 920 }
 921
 922
 923 static void scc_unthrottle (struct tty_struct * tty)
 924 {
 925         struct scc_port *port = (struct scc_port *)tty->driver_data;
 926         unsigned long   flags;
 927         SCC_ACCESS_INIT(port);
 928
 929         if (tty->termios->c_cflag & CRTSCTS) {
 930                 local_irq_save(flags);
 931                 SCCmod(TX_CTRL_REG, 0xff, TCR_RTS);
 932                 local_irq_restore(flags);
 933         }
 934         if (I_IXOFF(tty))
 935                 scc_send_xchar(tty, START_CHAR(tty));
 936 }
 937
 938
 939 static int scc_ioctl(struct tty_struct *tty, struct file *file,
 940                      unsigned int cmd, unsigned long arg)
 941 {
 942         return -ENOIOCTLCMD;
 943 }
 944
 945
 946 static int scc_break_ctl(struct tty_struct *tty, int break_state)
 947 {
 948         struct scc_port *port = (struct scc_port *)tty->driver_data;
 949         unsigned long   flags;
 950         SCC_ACCESS_INIT(port);
 951
 952         local_irq_save(flags);
 953         SCCmod(TX_CTRL_REG, ~TCR_SEND_BREAK,
 954                         break_state ? TCR_SEND_BREAK : 0);
 955         local_irq_restore(flags);
 956         return 0;
 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);