include/linux/serial_core.h

   1 /*
   2  *  linux/drivers/char/serial_core.h
   3  *
   4  *  Copyright (C) 2000 Deep Blue Solutions Ltd.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20 #ifndef LINUX_SERIAL_CORE_H
  21 #define LINUX_SERIAL_CORE_H
  22
  23 #include <linux/serial.h>
  24
  25 /*
  26  * The type definitions.  These are from Ted Ts'o's serial.h
  27  */
  28 #define PORT_UNKNOWN    0
  29 #define PORT_8250       1
  30 #define PORT_16450      2
  31 #define PORT_16550      3
  32 #define PORT_16550A     4
  33 #define PORT_CIRRUS     5
  34 #define PORT_16650      6
  35 #define PORT_16650V2    7
  36 #define PORT_16750      8
  37 #define PORT_STARTECH   9
  38 #define PORT_16C950     10
  39 #define PORT_16654      11
  40 #define PORT_16850      12
  41 #define PORT_RSA        13
  42 #define PORT_NS16550A   14
  43 #define PORT_XSCALE     15
  44 #define PORT_RM9000     16      /* PMC-Sierra RM9xxx internal UART */
  45 #define PORT_OCTEON     17      /* Cavium OCTEON internal UART */
  46 #define PORT_AR7        18      /* Texas Instruments AR7 internal UART */
  47 #define PORT_U6_16550A  19      /* ST-Ericsson U6xxx internal UART */
  48 #define PORT_MAX_8250   19      /* max port ID */
  49
  50 /*
  51  * ARM specific type numbers.  These are not currently guaranteed
  52  * to be implemented, and will change in the future.  These are
  53  * separate so any additions to the old serial.c that occur before
  54  * we are merged can be easily merged here.
  55  */
  56 #define PORT_PXA        31
  57 #define PORT_AMBA       32
  58 #define PORT_CLPS711X   33
  59 #define PORT_SA1100     34
  60 #define PORT_UART00     35
  61 #define PORT_21285      37
  62
  63 /* Sparc type numbers.  */
  64 #define PORT_SUNZILOG   38
  65 #define PORT_SUNSAB     39
  66
  67 /* DEC */
  68 #define PORT_DZ         46
  69 #define PORT_ZS         47
  70
  71 /* Parisc type numbers. */
  72 #define PORT_MUX        48
  73
  74 /* Atmel AT91 / AT32 SoC */
  75 #define PORT_ATMEL      49
  76
  77 /* Macintosh Zilog type numbers */
  78 #define PORT_MAC_ZILOG  50      /* m68k : not yet implemented */
  79 #define PORT_PMAC_ZILOG 51
  80
  81 /* SH-SCI */
  82 #define PORT_SCI        52
  83 #define PORT_SCIF       53
  84 #define PORT_IRDA       54
  85
  86 /* Samsung S3C2410 SoC and derivatives thereof */
  87 #define PORT_S3C2410    55
  88
  89 /* SGI IP22 aka Indy / Challenge S / Indigo 2 */
  90 #define PORT_IP22ZILOG  56
  91
  92 /* Sharp LH7a40x -- an ARM9 SoC series */
  93 #define PORT_LH7A40X    57
  94
  95 /* PPC CPM type number */
  96 #define PORT_CPM        58
  97
  98 /* MPC52xx type numbers */
  99 #define PORT_MPC52xx    59
 100
 101 /* IBM icom */
 102 #define PORT_ICOM       60
 103
 104 /* Samsung S3C2440 SoC */
 105 #define PORT_S3C2440    61
 106
 107 /* Motorola i.MX SoC */
 108 #define PORT_IMX        62
 109
 110 /* Marvell MPSC */
 111 #define PORT_MPSC       63
 112
 113 /* TXX9 type number */
 114 #define PORT_TXX9       64
 115
 116 /* NEC VR4100 series SIU/DSIU */
 117 #define PORT_VR41XX_SIU         65
 118 #define PORT_VR41XX_DSIU        66
 119
 120 /* Samsung S3C2400 SoC */
 121 #define PORT_S3C2400    67
 122
 123 /* M32R SIO */
 124 #define PORT_M32R_SIO   68
 125
 126 /*Digi jsm */
 127 #define PORT_JSM        69
 128
 129 #define PORT_PNX8XXX    70
 130
 131 /* Hilscher netx */
 132 #define PORT_NETX       71
 133
 134 /* SUN4V Hypervisor Console */
 135 #define PORT_SUNHV      72
 136
 137 #define PORT_S3C2412    73
 138
 139 /* Xilinx uartlite */
 140 #define PORT_UARTLITE   74
 141
 142 /* Blackfin bf5xx */
 143 #define PORT_BFIN       75
 144
 145 /* Micrel KS8695 */
 146 #define PORT_KS8695     76
 147
 148 /* Broadcom SB1250, etc. SOC */
 149 #define PORT_SB1250_DUART       77
 150
 151 /* Freescale ColdFire */
 152 #define PORT_MCF        78
 153
 154 /* Blackfin SPORT */
 155 #define PORT_BFIN_SPORT         79
 156
 157 /* MN10300 on-chip UART numbers */
 158 #define PORT_MN10300            80
 159 #define PORT_MN10300_CTS        81
 160
 161 #define PORT_SC26XX     82
 162
 163 /* SH-SCI */
 164 #define PORT_SCIFA      83
 165
 166 #define PORT_S3C6400    84
 167
 168 /* NWPSERIAL */
 169 #define PORT_NWPSERIAL  85
 170
 171 /* MAX3100 */
 172 #define PORT_MAX3100    86
 173
 174 /* Timberdale UART */
 175 #define PORT_TIMBUART   87
 176
 177 /* Qualcomm MSM SoCs */
 178 #define PORT_MSM        88
 179
 180 /* BCM63xx family SoCs */
 181 #define PORT_BCM63XX    89
 182
 183 /* Aeroflex Gaisler GRLIB APBUART */
 184 #define PORT_APBUART    90
 185
 186 /* Altera UARTs */
 187 #define PORT_ALTERA_JTAGUART    91
 188 #define PORT_ALTERA_UART        92
 189
 190 /* SH-SCI */
 191 #define PORT_SCIFB      93
 192
 193 /* MAX3107 */
 194 #define PORT_MAX3107    94
 195
 196 /* High Speed UART for Medfield */
 197 #define PORT_MFD        95
 198
 199 /* TI OMAP-UART */
 200 #define PORT_OMAP       96
 201
 202 #ifdef __KERNEL__
 203
 204 #include <linux/compiler.h>
 205 #include <linux/interrupt.h>
 206 #include <linux/circ_buf.h>
 207 #include <linux/spinlock.h>
 208 #include <linux/sched.h>
 209 #include <linux/tty.h>
 210 #include <linux/mutex.h>
 211 #include <linux/sysrq.h>
 212
 213 struct uart_port;
 214 struct serial_struct;
 215 struct device;
 216
 217 /*
 218  * This structure describes all the operations that can be
 219  * done on the physical hardware.
 220  */
 221 struct uart_ops {
 222         unsigned int    (*tx_empty)(struct uart_port *);
 223         void            (*set_mctrl)(struct uart_port *, unsigned int mctrl);
 224         unsigned int    (*get_mctrl)(struct uart_port *);
 225         void            (*stop_tx)(struct uart_port *);
 226         void            (*start_tx)(struct uart_port *);
 227         void            (*send_xchar)(struct uart_port *, char ch);
 228         void            (*stop_rx)(struct uart_port *);
 229         void            (*enable_ms)(struct uart_port *);
 230         void            (*break_ctl)(struct uart_port *, int ctl);
 231         int             (*startup)(struct uart_port *);
 232         void            (*shutdown)(struct uart_port *);
 233         void            (*flush_buffer)(struct uart_port *);
 234         void            (*set_termios)(struct uart_port *, struct ktermios *new,
 235                                        struct ktermios *old);
 236         void            (*set_ldisc)(struct uart_port *, int new);
 237         void            (*pm)(struct uart_port *, unsigned int state,
 238                               unsigned int oldstate);
 239         int             (*set_wake)(struct uart_port *, unsigned int state);
 240
 241         /*
 242          * Return a string describing the type of the port
 243          */
 244         const char *(*type)(struct uart_port *);
 245
 246         /*
 247          * Release IO and memory resources used by the port.
 248          * This includes iounmap if necessary.
 249          */
 250         void            (*release_port)(struct uart_port *);
 251
 252         /*
 253          * Request IO and memory resources used by the port.
 254          * This includes iomapping the port if necessary.
 255          */
 256         int             (*request_port)(struct uart_port *);
 257         void            (*config_port)(struct uart_port *, int);
 258         int             (*verify_port)(struct uart_port *, struct serial_struct *);
 259         int             (*ioctl)(struct uart_port *, unsigned int, unsigned long);
 260 #ifdef CONFIG_CONSOLE_POLL
 261         void    (*poll_put_char)(struct uart_port *, unsigned char);
 262         int             (*poll_get_char)(struct uart_port *);
 263 #endif
 264 };
 265
 266 #define NO_POLL_CHAR            0x00ff0000
 267 #define UART_CONFIG_TYPE        (1 << 0)
 268 #define UART_CONFIG_IRQ         (1 << 1)
 269
 270 struct uart_icount {
 271         __u32   cts;
 272         __u32   dsr;
 273         __u32   rng;
 274         __u32   dcd;
 275         __u32   rx;
 276         __u32   tx;
 277         __u32   frame;
 278         __u32   overrun;
 279         __u32   parity;
 280         __u32   brk;
 281         __u32   buf_overrun;
 282 };
 283
 284 typedef unsigned int __bitwise__ upf_t;
 285
 286 struct uart_port {
 287         spinlock_t              lock;                   /* port lock */
 288         unsigned long           iobase;                 /* in/out[bwl] */
 289         unsigned char __iomem   *membase;               /* read/write[bwl] */
 290         unsigned int            (*serial_in)(struct uart_port *, int);
 291         void                    (*serial_out)(struct uart_port *, int, int);
 292         void                    (*set_termios)(struct uart_port *,
 293                                                struct ktermios *new,
 294                                                struct ktermios *old);
 295         void                    (*pm)(struct uart_port *, unsigned int state,
 296                                       unsigned int old);
 297         unsigned int            irq;                    /* irq number */
 298         unsigned long           irqflags;               /* irq flags  */
 299         unsigned int            uartclk;                /* base uart clock */
 300         unsigned int            fifosize;               /* tx fifo size */
 301         unsigned char           x_char;                 /* xon/xoff char */
 302         unsigned char           regshift;               /* reg offset shift */
 303         unsigned char           iotype;                 /* io access style */
 304         unsigned char           unused1;
 305
 306 #define UPIO_PORT               (0)
 307 #define UPIO_HUB6               (1)
 308 #define UPIO_MEM                (2)
 309 #define UPIO_MEM32              (3)
 310 #define UPIO_AU                 (4)                     /* Au1x00 type IO */
 311 #define UPIO_TSI                (5)                     /* Tsi108/109 type IO */
 312 #define UPIO_DWAPB              (6)                     /* DesignWare APB UART */
 313 #define UPIO_RM9000             (7)                     /* RM9000 type IO */
 314
 315         unsigned int            read_status_mask;       /* driver specific */
 316         unsigned int            ignore_status_mask;     /* driver specific */
 317         struct uart_state       *state;                 /* pointer to parent state */
 318         struct uart_icount      icount;                 /* statistics */
 319
 320         struct console          *cons;                  /* struct console, if any */
 321 #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(SUPPORT_SYSRQ)
 322         unsigned long           sysrq;                  /* sysrq timeout */
 323 #endif
 324
 325         upf_t                   flags;
 326
 327 #define UPF_FOURPORT            ((__force upf_t) (1 << 1))
 328 #define UPF_SAK                 ((__force upf_t) (1 << 2))
 329 #define UPF_SPD_MASK            ((__force upf_t) (0x1030))
 330 #define UPF_SPD_HI              ((__force upf_t) (0x0010))
 331 #define UPF_SPD_VHI             ((__force upf_t) (0x0020))
 332 #define UPF_SPD_CUST            ((__force upf_t) (0x0030))
 333 #define UPF_SPD_SHI             ((__force upf_t) (0x1000))
 334 #define UPF_SPD_WARP            ((__force upf_t) (0x1010))
 335 #define UPF_SKIP_TEST           ((__force upf_t) (1 << 6))
 336 #define UPF_AUTO_IRQ            ((__force upf_t) (1 << 7))
 337 #define UPF_HARDPPS_CD          ((__force upf_t) (1 << 11))
 338 #define UPF_LOW_LATENCY         ((__force upf_t) (1 << 13))
 339 #define UPF_BUGGY_UART          ((__force upf_t) (1 << 14))
 340 #define UPF_NO_TXEN_TEST        ((__force upf_t) (1 << 15))
 341 #define UPF_MAGIC_MULTIPLIER    ((__force upf_t) (1 << 16))
 342 #define UPF_CONS_FLOW           ((__force upf_t) (1 << 23))
 343 #define UPF_SHARE_IRQ           ((__force upf_t) (1 << 24))
 344 /* The exact UART type is known and should not be probed.  */
 345 #define UPF_FIXED_TYPE          ((__force upf_t) (1 << 27))
 346 #define UPF_BOOT_AUTOCONF       ((__force upf_t) (1 << 28))
 347 #define UPF_FIXED_PORT          ((__force upf_t) (1 << 29))
 348 #define UPF_DEAD                ((__force upf_t) (1 << 30))
 349 #define UPF_IOREMAP             ((__force upf_t) (1 << 31))
 350
 351 #define UPF_CHANGE_MASK         ((__force upf_t) (0x17fff))
 352 #define UPF_USR_MASK            ((__force upf_t) (UPF_SPD_MASK|UPF_LOW_LATENCY))
 353
 354         unsigned int            mctrl;                  /* current modem ctrl settings */
 355         unsigned int            timeout;                /* character-based timeout */
 356         unsigned int            type;                   /* port type */
 357         const struct uart_ops   *ops;
 358         unsigned int            custom_divisor;
 359         unsigned int            line;                   /* port index */
 360         resource_size_t         mapbase;                /* for ioremap */
 361         struct device           *dev;                   /* parent device */
 362         unsigned char           hub6;                   /* this should be in the 8250 driver */
 363         unsigned char           suspended;
 364         unsigned char           unused[2];
 365         void                    *private_data;          /* generic platform data pointer */
 366 };
 367
 368 /*
 369  * This is the state information which is persistent across opens.
 370  */
 371 struct uart_state {
 372         struct tty_port         port;
 373
 374         int                     pm_state;
 375         struct circ_buf         xmit;
 376
 377         struct tasklet_struct   tlet;
 378         struct uart_port        *uart_port;
 379 };
 380
 381 #define UART_XMIT_SIZE  PAGE_SIZE
 382
 383
 384 /* number of characters left in xmit buffer before we ask for more */
 385 #define WAKEUP_CHARS            256
 386
 387 struct module;
 388 struct tty_driver;
 389
 390 struct uart_driver {
 391         struct module           *owner;
 392         const char              *driver_name;
 393         const char              *dev_name;
 394         int                      major;
 395         int                      minor;
 396         int                      nr;
 397         struct console          *cons;
 398
 399         /*
 400          * these are private; the low level driver should not
 401          * touch these; they should be initialised to NULL
 402          */
 403         struct uart_state       *state;
 404         struct tty_driver       *tty_driver;
 405 };
 406
 407 void uart_write_wakeup(struct uart_port *port);
 408
 409 /*
 410  * Baud rate helpers.
 411  */
 412 void uart_update_timeout(struct uart_port *port, unsigned int cflag,
 413                          unsigned int baud);
 414 unsigned int uart_get_baud_rate(struct uart_port *port, struct ktermios *termios,
 415                                 struct ktermios *old, unsigned int min,
 416                                 unsigned int max);
 417 unsigned int uart_get_divisor(struct uart_port *port, unsigned int baud);
 418
 419 /* Base timer interval for polling */
 420 static inline int uart_poll_timeout(struct uart_port *port)
 421 {
 422         int timeout = port->timeout;
 423
 424         return timeout > 6 ? (timeout / 2 - 2) : 1;
 425 }
 426
 427 /*
 428  * Console helpers.
 429  */
 430 struct uart_port *uart_get_console(struct uart_port *ports, int nr,
 431                                    struct console *c);
 432 void uart_parse_options(char *options, int *baud, int *parity, int *bits,
 433                         int *flow);
 434 int uart_set_options(struct uart_port *port, struct console *co, int baud,
 435                      int parity, int bits, int flow);
 436 struct tty_driver *uart_console_device(struct console *co, int *index);
 437 void uart_console_write(struct uart_port *port, const char *s,
 438                         unsigned int count,
 439                         void (*putchar)(struct uart_port *, int));
 440
 441 /*
 442  * Port/driver registration/removal
 443  */
 444 int uart_register_driver(struct uart_driver *uart);
 445 void uart_unregister_driver(struct uart_driver *uart);
 446 int uart_add_one_port(struct uart_driver *reg, struct uart_port *port);
 447 int uart_remove_one_port(struct uart_driver *reg, struct uart_port *port);
 448 int uart_match_port(struct uart_port *port1, struct uart_port *port2);
 449
 450 /*
 451  * Power Management
 452  */
 453 int uart_suspend_port(struct uart_driver *reg, struct uart_port *port);
 454 int uart_resume_port(struct uart_driver *reg, struct uart_port *port);
 455
 456 #define uart_circ_empty(circ)           ((circ)->head == (circ)->tail)
 457 #define uart_circ_clear(circ)           ((circ)->head = (circ)->tail = 0)
 458
 459 #define uart_circ_chars_pending(circ)   \
 460         (CIRC_CNT((circ)->head, (circ)->tail, UART_XMIT_SIZE))
 461
 462 #define uart_circ_chars_free(circ)      \
 463         (CIRC_SPACE((circ)->head, (circ)->tail, UART_XMIT_SIZE))
 464
 465 static inline int uart_tx_stopped(struct uart_port *port)
 466 {
 467         struct tty_struct *tty = port->state->port.tty;
 468         if(tty->stopped || tty->hw_stopped)
 469                 return 1;
 470         return 0;
 471 }
 472
 473 /*
 474  * The following are helper functions for the low level drivers.
 475  */
 476 static inline int
 477 uart_handle_sysrq_char(struct uart_port *port, unsigned int ch)
 478 {
 479 #ifdef SUPPORT_SYSRQ
 480         if (port->sysrq) {
 481                 if (ch && time_before(jiffies, port->sysrq)) {
 482                         handle_sysrq(ch);
 483                         port->sysrq = 0;
 484                         return 1;
 485                 }
 486                 port->sysrq = 0;
 487         }
 488 #endif
 489         return 0;
 490 }
 491 #ifndef SUPPORT_SYSRQ
 492 #define uart_handle_sysrq_char(port,ch) uart_handle_sysrq_char(port, 0)
 493 #endif
 494
 495 /*
 496  * We do the SysRQ and SAK checking like this...
 497  */
 498 static inline int uart_handle_break(struct uart_port *port)
 499 {
 500         struct uart_state *state = port->state;
 501 #ifdef SUPPORT_SYSRQ
 502         if (port->cons && port->cons->index == port->line) {
 503                 if (!port->sysrq) {
 504                         port->sysrq = jiffies + HZ*5;
 505                         return 1;
 506                 }
 507                 port->sysrq = 0;
 508         }
 509 #endif
 510         if (port->flags & UPF_SAK)
 511                 do_SAK(state->port.tty);
 512         return 0;
 513 }
 514
 515 /**
 516  *      uart_handle_dcd_change - handle a change of carrier detect state
 517  *      @uport: uart_port structure for the open port
 518  *      @status: new carrier detect status, nonzero if active
 519  */
 520 static inline void
 521 uart_handle_dcd_change(struct uart_port *uport, unsigned int status)
 522 {
 523         struct uart_state *state = uport->state;
 524         struct tty_port *port = &state->port;
 525         struct tty_ldisc *ld = tty_ldisc_ref(port->tty);
 526         struct timespec ts;
 527
 528         if (ld && ld->ops->dcd_change)
 529                 getnstimeofday(&ts);
 530
 531         uport->icount.dcd++;
 532 #ifdef CONFIG_HARD_PPS
 533         if ((uport->flags & UPF_HARDPPS_CD) && status)
 534                 hardpps();
 535 #endif
 536
 537         if (port->flags & ASYNC_CHECK_CD) {
 538                 if (status)
 539                         wake_up_interruptible(&port->open_wait);
 540                 else if (port->tty)
 541                         tty_hangup(port->tty);
 542         }
 543
 544         if (ld && ld->ops->dcd_change)
 545                 ld->ops->dcd_change(port->tty, status, &ts);
 546         if (ld)
 547                 tty_ldisc_deref(ld);
 548 }
 549
 550 /**
 551  *      uart_handle_cts_change - handle a change of clear-to-send state
 552  *      @uport: uart_port structure for the open port
 553  *      @status: new clear to send status, nonzero if active
 554  */
 555 static inline void
 556 uart_handle_cts_change(struct uart_port *uport, unsigned int status)
 557 {
 558         struct tty_port *port = &uport->state->port;
 559         struct tty_struct *tty = port->tty;
 560
 561         uport->icount.cts++;
 562
 563         if (port->flags & ASYNC_CTS_FLOW) {
 564                 if (tty->hw_stopped) {
 565                         if (status) {
 566                                 tty->hw_stopped = 0;
 567                                 uport->ops->start_tx(uport);
 568                                 uart_write_wakeup(uport);
 569                         }
 570                 } else {
 571                         if (!status) {
 572                                 tty->hw_stopped = 1;
 573                                 uport->ops->stop_tx(uport);
 574                         }
 575                 }
 576         }
 577 }
 578
 579 #include <linux/tty_flip.h>
 580
 581 static inline void
 582 uart_insert_char(struct uart_port *port, unsigned int status,
 583                  unsigned int overrun, unsigned int ch, unsigned int flag)
 584 {
 585         struct tty_struct *tty = port->state->port.tty;
 586
 587         if ((status & port->ignore_status_mask & ~overrun) == 0)
 588                 tty_insert_flip_char(tty, ch, flag);
 589
 590         /*
 591          * Overrun is special.  Since it's reported immediately,
 592          * it doesn't affect the current character.
 593          */
 594         if (status & ~port->ignore_status_mask & overrun)
 595                 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
 596 }
 597
 598 /*
 599  *      UART_ENABLE_MS - determine if port should enable modem status irqs
 600  */
 601 #define UART_ENABLE_MS(port,cflag)      ((port)->flags & UPF_HARDPPS_CD || \
 602                                          (cflag) & CRTSCTS || \
 603                                          !((cflag) & CLOCAL))
 604
 605 #endif
 606
 607 #endif /* LINUX_SERIAL_CORE_H */