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 /*
  24  * The type definitions.  These are from Ted Ts'o's serial.h
  25  */
  26 #define PORT_UNKNOWN    0
  27 #define PORT_8250       1
  28 #define PORT_16450      2
  29 #define PORT_16550      3
  30 #define PORT_16550A     4
  31 #define PORT_CIRRUS     5
  32 #define PORT_16650      6
  33 #define PORT_16650V2    7
  34 #define PORT_16750      8
  35 #define PORT_STARTECH   9
  36 #define PORT_16C950     10
  37 #define PORT_16654      11
  38 #define PORT_16850      12
  39 #define PORT_RSA        13
  40 #define PORT_NS16550A   14
  41 #define PORT_XSCALE     15
  42 #define PORT_MAX_8250   15      /* max port ID */
  43
  44 /*
  45  * ARM specific type numbers.  These are not currently guaranteed
  46  * to be implemented, and will change in the future.  These are
  47  * separate so any additions to the old serial.c that occur before
  48  * we are merged can be easily merged here.
  49  */
  50 #define PORT_PXA        31
  51 #define PORT_AMBA       32
  52 #define PORT_CLPS711X   33
  53 #define PORT_SA1100     34
  54 #define PORT_UART00     35
  55 #define PORT_21285      37
  56
  57 /* Sparc type numbers.  */
  58 #define PORT_SUNZILOG   38
  59 #define PORT_SUNSAB     39
  60
  61 /* NEC v850.  */
  62 #define PORT_V850E_UART 40
  63
  64 /* DZ */
  65 #define PORT_DZ         47
  66
  67 /* Parisc type numbers. */
  68 #define PORT_MUX        48
  69
  70 /* Atmel AT91RM9200 SoC */
  71 #define PORT_AT91RM9200 49
  72
  73 /* Macintosh Zilog type numbers */
  74 #define PORT_MAC_ZILOG  50      /* m68k : not yet implemented */
  75 #define PORT_PMAC_ZILOG 51
  76
  77 /* SH-SCI */
  78 #define PORT_SCI        52
  79 #define PORT_SCIF       53
  80 #define PORT_IRDA       54
  81
  82 /* Samsung S3C2410 SoC and derivatives thereof */
  83 #define PORT_S3C2410    55
  84
  85 /* SGI IP22 aka Indy / Challenge S / Indigo 2 */
  86 #define PORT_IP22ZILOG  56
  87
  88 /* Sharp LH7a40x -- an ARM9 SoC series */
  89 #define PORT_LH7A40X    57
  90
  91 /* PPC CPM type number */
  92 #define PORT_CPM        58
  93
  94 /* MPC52xx type numbers */
  95 #define PORT_MPC52xx    59
  96
  97 /* IBM icom */
  98 #define PORT_ICOM       60
  99
 100 /* Samsung S3C2440 SoC */
 101 #define PORT_S3C2440    61
 102
 103 /* Motorola i.MX SoC */
 104 #define PORT_IMX        62
 105
 106 /* Marvell MPSC */
 107 #define PORT_MPSC       63
 108
 109 /* TXX9 type number */
 110 #define PORT_TXX9       64
 111
 112 /* NEC VR4100 series SIU/DSIU */
 113 #define PORT_VR41XX_SIU         65
 114 #define PORT_VR41XX_DSIU        66
 115
 116 /* Samsung S3C2400 SoC */
 117 #define PORT_S3C2400    67
 118
 119 /* M32R SIO */
 120 #define PORT_M32R_SIO   68
 121
 122 /*Digi jsm */
 123 #define PORT_JSM        69
 124
 125 #define PORT_IP3106     70
 126
 127 /* Hilscher netx */
 128 #define PORT_NETX       71
 129
 130 #ifdef __KERNEL__
 131
 132 #include <linux/config.h>
 133 #include <linux/compiler.h>
 134 #include <linux/interrupt.h>
 135 #include <linux/circ_buf.h>
 136 #include <linux/spinlock.h>
 137 #include <linux/sched.h>
 138 #include <linux/tty.h>
 139 #include <linux/mutex.h>
 140
 141 struct uart_port;
 142 struct uart_info;
 143 struct serial_struct;
 144 struct device;
 145
 146 /*
 147  * This structure describes all the operations that can be
 148  * done on the physical hardware.
 149  */
 150 struct uart_ops {
 151         unsigned int    (*tx_empty)(struct uart_port *);
 152         void            (*set_mctrl)(struct uart_port *, unsigned int mctrl);
 153         unsigned int    (*get_mctrl)(struct uart_port *);
 154         void            (*stop_tx)(struct uart_port *);
 155         void            (*start_tx)(struct uart_port *);
 156         void            (*send_xchar)(struct uart_port *, char ch);
 157         void            (*stop_rx)(struct uart_port *);
 158         void            (*enable_ms)(struct uart_port *);
 159         void            (*break_ctl)(struct uart_port *, int ctl);
 160         int             (*startup)(struct uart_port *);
 161         void            (*shutdown)(struct uart_port *);
 162         void            (*set_termios)(struct uart_port *, struct termios *new,
 163                                        struct termios *old);
 164         void            (*pm)(struct uart_port *, unsigned int state,
 165                               unsigned int oldstate);
 166         int             (*set_wake)(struct uart_port *, unsigned int state);
 167
 168         /*
 169          * Return a string describing the type of the port
 170          */
 171         const char *(*type)(struct uart_port *);
 172
 173         /*
 174          * Release IO and memory resources used by the port.
 175          * This includes iounmap if necessary.
 176          */
 177         void            (*release_port)(struct uart_port *);
 178
 179         /*
 180          * Request IO and memory resources used by the port.
 181          * This includes iomapping the port if necessary.
 182          */
 183         int             (*request_port)(struct uart_port *);
 184         void            (*config_port)(struct uart_port *, int);
 185         int             (*verify_port)(struct uart_port *, struct serial_struct *);
 186         int             (*ioctl)(struct uart_port *, unsigned int, unsigned long);
 187 };
 188
 189 #define UART_CONFIG_TYPE        (1 << 0)
 190 #define UART_CONFIG_IRQ         (1 << 1)
 191
 192 struct uart_icount {
 193         __u32   cts;
 194         __u32   dsr;
 195         __u32   rng;
 196         __u32   dcd;
 197         __u32   rx;
 198         __u32   tx;
 199         __u32   frame;
 200         __u32   overrun;
 201         __u32   parity;
 202         __u32   brk;
 203         __u32   buf_overrun;
 204 };
 205
 206 struct uart_port {
 207         spinlock_t              lock;                   /* port lock */
 208         unsigned int            iobase;                 /* in/out[bwl] */
 209         unsigned char __iomem   *membase;               /* read/write[bwl] */
 210         unsigned int            irq;                    /* irq number */
 211         unsigned int            uartclk;                /* base uart clock */
 212         unsigned char           fifosize;               /* tx fifo size */
 213         unsigned char           x_char;                 /* xon/xoff char */
 214         unsigned char           regshift;               /* reg offset shift */
 215         unsigned char           iotype;                 /* io access style */
 216
 217 #define UPIO_PORT               (0)
 218 #define UPIO_HUB6               (1)
 219 #define UPIO_MEM                (2)
 220 #define UPIO_MEM32              (3)
 221 #define UPIO_AU                 (4)                     /* Au1x00 type IO */
 222
 223         unsigned int            read_status_mask;       /* driver specific */
 224         unsigned int            ignore_status_mask;     /* driver specific */
 225         struct uart_info        *info;                  /* pointer to parent info */
 226         struct uart_icount      icount;                 /* statistics */
 227
 228         struct console          *cons;                  /* struct console, if any */
 229 #ifdef CONFIG_SERIAL_CORE_CONSOLE
 230         unsigned long           sysrq;                  /* sysrq timeout */
 231 #endif
 232
 233         unsigned int            flags;
 234
 235 #define UPF_FOURPORT            (1 << 1)
 236 #define UPF_SAK                 (1 << 2)
 237 #define UPF_SPD_MASK            (0x1030)
 238 #define UPF_SPD_HI              (0x0010)
 239 #define UPF_SPD_VHI             (0x0020)
 240 #define UPF_SPD_CUST            (0x0030)
 241 #define UPF_SPD_SHI             (0x1000)
 242 #define UPF_SPD_WARP            (0x1010)
 243 #define UPF_SKIP_TEST           (1 << 6)
 244 #define UPF_AUTO_IRQ            (1 << 7)
 245 #define UPF_HARDPPS_CD          (1 << 11)
 246 #define UPF_LOW_LATENCY         (1 << 13)
 247 #define UPF_BUGGY_UART          (1 << 14)
 248 #define UPF_AUTOPROBE           (1 << 15)
 249 #define UPF_MAGIC_MULTIPLIER    (1 << 16)
 250 #define UPF_BOOT_ONLYMCA        (1 << 22)
 251 #define UPF_CONS_FLOW           (1 << 23)
 252 #define UPF_SHARE_IRQ           (1 << 24)
 253 #define UPF_BOOT_AUTOCONF       (1 << 28)
 254 #define UPF_IOREMAP             (1 << 31)
 255
 256 #define UPF_CHANGE_MASK         (0x17fff)
 257 #define UPF_USR_MASK            (UPF_SPD_MASK|UPF_LOW_LATENCY)
 258
 259         unsigned int            mctrl;                  /* current modem ctrl settings */
 260         unsigned int            timeout;                /* character-based timeout */
 261         unsigned int            type;                   /* port type */
 262         struct uart_ops         *ops;
 263         unsigned int            custom_divisor;
 264         unsigned int            line;                   /* port index */
 265         unsigned long           mapbase;                /* for ioremap */
 266         struct device           *dev;                   /* parent device */
 267         unsigned char           hub6;                   /* this should be in the 8250 driver */
 268         unsigned char           unused[3];
 269 };
 270
 271 /*
 272  * This is the state information which is persistent across opens.
 273  * The low level driver must not to touch any elements contained
 274  * within.
 275  */
 276 struct uart_state {
 277         unsigned int            close_delay;            /* msec */
 278         unsigned int            closing_wait;           /* msec */
 279
 280 #define USF_CLOSING_WAIT_INF    (0)
 281 #define USF_CLOSING_WAIT_NONE   (~0U)
 282
 283         int                     count;
 284         int                     pm_state;
 285         struct uart_info        *info;
 286         struct uart_port        *port;
 287
 288         struct mutex            mutex;
 289 };
 290
 291 #define UART_XMIT_SIZE  PAGE_SIZE
 292 /*
 293  * This is the state information which is only valid when the port
 294  * is open; it may be freed by the core driver once the device has
 295  * been closed.  Either the low level driver or the core can modify
 296  * stuff here.
 297  */
 298 struct uart_info {
 299         struct tty_struct       *tty;
 300         struct circ_buf         xmit;
 301         unsigned int            flags;
 302
 303 /*
 304  * These are the flags that specific to info->flags, and reflect our
 305  * internal state.  They can not be accessed via port->flags.  Low
 306  * level drivers must not change these, but may query them instead.
 307  */
 308 #define UIF_CHECK_CD            (1 << 25)
 309 #define UIF_CTS_FLOW            (1 << 26)
 310 #define UIF_NORMAL_ACTIVE       (1 << 29)
 311 #define UIF_INITIALIZED         (1 << 31)
 312
 313         int                     blocked_open;
 314
 315         struct tasklet_struct   tlet;
 316
 317         wait_queue_head_t       open_wait;
 318         wait_queue_head_t       delta_msr_wait;
 319 };
 320
 321 /* number of characters left in xmit buffer before we ask for more */
 322 #define WAKEUP_CHARS            256
 323
 324 struct module;
 325 struct tty_driver;
 326
 327 struct uart_driver {
 328         struct module           *owner;
 329         const char              *driver_name;
 330         const char              *dev_name;
 331         const char              *devfs_name;
 332         int                      major;
 333         int                      minor;
 334         int                      nr;
 335         struct console          *cons;
 336
 337         /*
 338          * these are private; the low level driver should not
 339          * touch these; they should be initialised to NULL
 340          */
 341         struct uart_state       *state;
 342         struct tty_driver       *tty_driver;
 343 };
 344
 345 void uart_write_wakeup(struct uart_port *port);
 346
 347 /*
 348  * Baud rate helpers.
 349  */
 350 void uart_update_timeout(struct uart_port *port, unsigned int cflag,
 351                          unsigned int baud);
 352 unsigned int uart_get_baud_rate(struct uart_port *port, struct termios *termios,
 353                                 struct termios *old, unsigned int min,
 354                                 unsigned int max);
 355 unsigned int uart_get_divisor(struct uart_port *port, unsigned int baud);
 356
 357 /*
 358  * Console helpers.
 359  */
 360 struct uart_port *uart_get_console(struct uart_port *ports, int nr,
 361                                    struct console *c);
 362 void uart_parse_options(char *options, int *baud, int *parity, int *bits,
 363                         int *flow);
 364 int uart_set_options(struct uart_port *port, struct console *co, int baud,
 365                      int parity, int bits, int flow);
 366 struct tty_driver *uart_console_device(struct console *co, int *index);
 367
 368 /*
 369  * Port/driver registration/removal
 370  */
 371 int uart_register_driver(struct uart_driver *uart);
 372 void uart_unregister_driver(struct uart_driver *uart);
 373 int uart_add_one_port(struct uart_driver *reg, struct uart_port *port);
 374 int uart_remove_one_port(struct uart_driver *reg, struct uart_port *port);
 375 int uart_match_port(struct uart_port *port1, struct uart_port *port2);
 376
 377 /*
 378  * Power Management
 379  */
 380 int uart_suspend_port(struct uart_driver *reg, struct uart_port *port);
 381 int uart_resume_port(struct uart_driver *reg, struct uart_port *port);
 382
 383 #define uart_circ_empty(circ)           ((circ)->head == (circ)->tail)
 384 #define uart_circ_clear(circ)           ((circ)->head = (circ)->tail = 0)
 385
 386 #define uart_circ_chars_pending(circ)   \
 387         (CIRC_CNT((circ)->head, (circ)->tail, UART_XMIT_SIZE))
 388
 389 #define uart_circ_chars_free(circ)      \
 390         (CIRC_SPACE((circ)->head, (circ)->tail, UART_XMIT_SIZE))
 391
 392 #define uart_tx_stopped(port)           \
 393         ((port)->info->tty->stopped || (port)->info->tty->hw_stopped)
 394
 395 /*
 396  * The following are helper functions for the low level drivers.
 397  */
 398 static inline int
 399 uart_handle_sysrq_char(struct uart_port *port, unsigned int ch,
 400                        struct pt_regs *regs)
 401 {
 402 #ifdef SUPPORT_SYSRQ
 403         if (port->sysrq) {
 404                 if (ch && time_before(jiffies, port->sysrq)) {
 405                         handle_sysrq(ch, regs, NULL);
 406                         port->sysrq = 0;
 407                         return 1;
 408                 }
 409                 port->sysrq = 0;
 410         }
 411 #endif
 412         return 0;
 413 }
 414 #ifndef SUPPORT_SYSRQ
 415 #define uart_handle_sysrq_char(port,ch,regs) uart_handle_sysrq_char(port, 0, NULL)
 416 #endif
 417
 418 /*
 419  * We do the SysRQ and SAK checking like this...
 420  */
 421 static inline int uart_handle_break(struct uart_port *port)
 422 {
 423         struct uart_info *info = port->info;
 424 #ifdef SUPPORT_SYSRQ
 425         if (port->cons && port->cons->index == port->line) {
 426                 if (!port->sysrq) {
 427                         port->sysrq = jiffies + HZ*5;
 428                         return 1;
 429                 }
 430                 port->sysrq = 0;
 431         }
 432 #endif
 433         if (info->flags & UPF_SAK)
 434                 do_SAK(info->tty);
 435         return 0;
 436 }
 437
 438 /**
 439  *      uart_handle_dcd_change - handle a change of carrier detect state
 440  *      @port: uart_port structure for the open port
 441  *      @status: new carrier detect status, nonzero if active
 442  */
 443 static inline void
 444 uart_handle_dcd_change(struct uart_port *port, unsigned int status)
 445 {
 446         struct uart_info *info = port->info;
 447
 448         port->icount.dcd++;
 449
 450 #ifdef CONFIG_HARD_PPS
 451         if ((port->flags & UPF_HARDPPS_CD) && status)
 452                 hardpps();
 453 #endif
 454
 455         if (info->flags & UIF_CHECK_CD) {
 456                 if (status)
 457                         wake_up_interruptible(&info->open_wait);
 458                 else if (info->tty)
 459                         tty_hangup(info->tty);
 460         }
 461 }
 462
 463 /**
 464  *      uart_handle_cts_change - handle a change of clear-to-send state
 465  *      @port: uart_port structure for the open port
 466  *      @status: new clear to send status, nonzero if active
 467  */
 468 static inline void
 469 uart_handle_cts_change(struct uart_port *port, unsigned int status)
 470 {
 471         struct uart_info *info = port->info;
 472         struct tty_struct *tty = info->tty;
 473
 474         port->icount.cts++;
 475
 476         if (info->flags & UIF_CTS_FLOW) {
 477                 if (tty->hw_stopped) {
 478                         if (status) {
 479                                 tty->hw_stopped = 0;
 480                                 port->ops->start_tx(port);
 481                                 uart_write_wakeup(port);
 482                         }
 483                 } else {
 484                         if (!status) {
 485                                 tty->hw_stopped = 1;
 486                                 port->ops->stop_tx(port);
 487                         }
 488                 }
 489         }
 490 }
 491
 492 #include <linux/tty_flip.h>
 493
 494 static inline void
 495 uart_insert_char(struct uart_port *port, unsigned int status,
 496                  unsigned int overrun, unsigned int ch, unsigned int flag)
 497 {
 498         struct tty_struct *tty = port->info->tty;
 499
 500         if ((status & port->ignore_status_mask & ~overrun) == 0)
 501                 tty_insert_flip_char(tty, ch, flag);
 502
 503         /*
 504          * Overrun is special.  Since it's reported immediately,
 505          * it doesn't affect the current character.
 506          */
 507         if (status & ~port->ignore_status_mask & overrun)
 508                 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
 509 }
 510
 511 /*
 512  *      UART_ENABLE_MS - determine if port should enable modem status irqs
 513  */
 514 #define UART_ENABLE_MS(port,cflag)      ((port)->flags & UPF_HARDPPS_CD || \
 515                                          (cflag) & CRTSCTS || \
 516                                          !((cflag) & CLOCAL))
 517
 518 #endif
 519
 520 #endif /* LINUX_SERIAL_CORE_H */