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_IP3106     16
  43 #define PORT_MAX_8250   16      /* max port ID */
  44
  45 /*
  46  * ARM specific type numbers.  These are not currently guaranteed
  47  * to be implemented, and will change in the future.  These are
  48  * separate so any additions to the old serial.c that occur before
  49  * we are merged can be easily merged here.
  50  */
  51 #define PORT_PXA        31
  52 #define PORT_AMBA       32
  53 #define PORT_CLPS711X   33
  54 #define PORT_SA1100     34
  55 #define PORT_UART00     35
  56 #define PORT_21285      37
  57
  58 /* Sparc type numbers.  */
  59 #define PORT_SUNZILOG   38
  60 #define PORT_SUNSAB     39
  61
  62 /* NEC v850.  */
  63 #define PORT_V850E_UART 40
  64
  65 /* DZ */
  66 #define PORT_DZ         47
  67
  68 /* Parisc type numbers. */
  69 #define PORT_MUX        48
  70
  71 /* Macintosh Zilog type numbers */
  72 #define PORT_MAC_ZILOG  50      /* m68k : not yet implemented */
  73 #define PORT_PMAC_ZILOG 51
  74
  75 /* SH-SCI */
  76 #define PORT_SCI        52
  77 #define PORT_SCIF       53
  78 #define PORT_IRDA       54
  79
  80 /* Samsung S3C2410 SoC and derivatives thereof */
  81 #define PORT_S3C2410    55
  82
  83 /* SGI IP22 aka Indy / Challenge S / Indigo 2 */
  84 #define PORT_IP22ZILOG  56
  85
  86 /* Sharp LH7a40x -- an ARM9 SoC series */
  87 #define PORT_LH7A40X    57
  88
  89 /* PPC CPM type number */
  90 #define PORT_CPM        58
  91
  92 /* MPC52xx type numbers */
  93 #define PORT_MPC52xx    59
  94
  95 /* IBM icom */
  96 #define PORT_ICOM       60
  97
  98 /* Samsung S3C2440 SoC */
  99 #define PORT_S3C2440    61
 100
 101 /* Motorola i.MX SoC */
 102 #define PORT_IMX        62
 103
 104 /* Marvell MPSC */
 105 #define PORT_MPSC       63
 106
 107 /* TXX9 type number */
 108 #define PORT_TXX9       64
 109
 110 /* NEC VR4100 series SIU/DSIU */
 111 #define PORT_VR41XX_SIU         65
 112 #define PORT_VR41XX_DSIU        66
 113
 114 /* Samsung S3C2400 SoC */
 115 #define PORT_S3C2400    67
 116
 117 /* M32R SIO */
 118 #define PORT_M32R_SIO   68
 119
 120 /*Digi jsm */
 121 #define PORT_JSM        65
 122
 123 #ifdef __KERNEL__
 124
 125 #include <linux/config.h>
 126 #include <linux/compiler.h>
 127 #include <linux/interrupt.h>
 128 #include <linux/circ_buf.h>
 129 #include <linux/spinlock.h>
 130 #include <linux/sched.h>
 131 #include <linux/tty.h>
 132
 133 struct uart_port;
 134 struct uart_info;
 135 struct serial_struct;
 136 struct device;
 137
 138 /*
 139  * This structure describes all the operations that can be
 140  * done on the physical hardware.
 141  */
 142 struct uart_ops {
 143         unsigned int    (*tx_empty)(struct uart_port *);
 144         void            (*set_mctrl)(struct uart_port *, unsigned int mctrl);
 145         unsigned int    (*get_mctrl)(struct uart_port *);
 146         void            (*stop_tx)(struct uart_port *);
 147         void            (*start_tx)(struct uart_port *);
 148         void            (*send_xchar)(struct uart_port *, char ch);
 149         void            (*stop_rx)(struct uart_port *);
 150         void            (*enable_ms)(struct uart_port *);
 151         void            (*break_ctl)(struct uart_port *, int ctl);
 152         int             (*startup)(struct uart_port *);
 153         void            (*shutdown)(struct uart_port *);
 154         void            (*set_termios)(struct uart_port *, struct termios *new,
 155                                        struct termios *old);
 156         void            (*pm)(struct uart_port *, unsigned int state,
 157                               unsigned int oldstate);
 158         int             (*set_wake)(struct uart_port *, unsigned int state);
 159
 160         /*
 161          * Return a string describing the type of the port
 162          */
 163         const char *(*type)(struct uart_port *);
 164
 165         /*
 166          * Release IO and memory resources used by the port.
 167          * This includes iounmap if necessary.
 168          */
 169         void            (*release_port)(struct uart_port *);
 170
 171         /*
 172          * Request IO and memory resources used by the port.
 173          * This includes iomapping the port if necessary.
 174          */
 175         int             (*request_port)(struct uart_port *);
 176         void            (*config_port)(struct uart_port *, int);
 177         int             (*verify_port)(struct uart_port *, struct serial_struct *);
 178         int             (*ioctl)(struct uart_port *, unsigned int, unsigned long);
 179 };
 180
 181 #define UART_CONFIG_TYPE        (1 << 0)
 182 #define UART_CONFIG_IRQ         (1 << 1)
 183
 184 struct uart_icount {
 185         __u32   cts;
 186         __u32   dsr;
 187         __u32   rng;
 188         __u32   dcd;
 189         __u32   rx;
 190         __u32   tx;
 191         __u32   frame;
 192         __u32   overrun;
 193         __u32   parity;
 194         __u32   brk;
 195         __u32   buf_overrun;
 196 };
 197
 198 struct uart_port {
 199         spinlock_t              lock;                   /* port lock */
 200         unsigned int            iobase;                 /* in/out[bwl] */
 201         unsigned char __iomem   *membase;               /* read/write[bwl] */
 202         unsigned int            irq;                    /* irq number */
 203         unsigned int            uartclk;                /* base uart clock */
 204         unsigned char           fifosize;               /* tx fifo size */
 205         unsigned char           x_char;                 /* xon/xoff char */
 206         unsigned char           regshift;               /* reg offset shift */
 207         unsigned char           iotype;                 /* io access style */
 208
 209 #define UPIO_PORT               (0)
 210 #define UPIO_HUB6               (1)
 211 #define UPIO_MEM                (2)
 212 #define UPIO_MEM32              (3)
 213
 214         unsigned int            read_status_mask;       /* driver specific */
 215         unsigned int            ignore_status_mask;     /* driver specific */
 216         struct uart_info        *info;                  /* pointer to parent info */
 217         struct uart_icount      icount;                 /* statistics */
 218
 219         struct console          *cons;                  /* struct console, if any */
 220 #ifdef CONFIG_SERIAL_CORE_CONSOLE
 221         unsigned long           sysrq;                  /* sysrq timeout */
 222 #endif
 223
 224         unsigned int            flags;
 225
 226 #define UPF_FOURPORT            (1 << 1)
 227 #define UPF_SAK                 (1 << 2)
 228 #define UPF_SPD_MASK            (0x1030)
 229 #define UPF_SPD_HI              (0x0010)
 230 #define UPF_SPD_VHI             (0x0020)
 231 #define UPF_SPD_CUST            (0x0030)
 232 #define UPF_SPD_SHI             (0x1000)
 233 #define UPF_SPD_WARP            (0x1010)
 234 #define UPF_SKIP_TEST           (1 << 6)
 235 #define UPF_AUTO_IRQ            (1 << 7)
 236 #define UPF_HARDPPS_CD          (1 << 11)
 237 #define UPF_LOW_LATENCY         (1 << 13)
 238 #define UPF_BUGGY_UART          (1 << 14)
 239 #define UPF_AUTOPROBE           (1 << 15)
 240 #define UPF_MAGIC_MULTIPLIER    (1 << 16)
 241 #define UPF_BOOT_ONLYMCA        (1 << 22)
 242 #define UPF_CONS_FLOW           (1 << 23)
 243 #define UPF_SHARE_IRQ           (1 << 24)
 244 #define UPF_BOOT_AUTOCONF       (1 << 28)
 245 #define UPF_IOREMAP             (1 << 31)
 246
 247 #define UPF_CHANGE_MASK         (0x17fff)
 248 #define UPF_USR_MASK            (UPF_SPD_MASK|UPF_LOW_LATENCY)
 249
 250         unsigned int            mctrl;                  /* current modem ctrl settings */
 251         unsigned int            timeout;                /* character-based timeout */
 252         unsigned int            type;                   /* port type */
 253         struct uart_ops         *ops;
 254         unsigned int            custom_divisor;
 255         unsigned int            line;                   /* port index */
 256         unsigned long           mapbase;                /* for ioremap */
 257         struct device           *dev;                   /* parent device */
 258         unsigned char           hub6;                   /* this should be in the 8250 driver */
 259         unsigned char           unused[3];
 260 };
 261
 262 /*
 263  * This is the state information which is persistent across opens.
 264  * The low level driver must not to touch any elements contained
 265  * within.
 266  */
 267 struct uart_state {
 268         unsigned int            close_delay;            /* msec */
 269         unsigned int            closing_wait;           /* msec */
 270
 271 #define USF_CLOSING_WAIT_INF    (0)
 272 #define USF_CLOSING_WAIT_NONE   (~0U)
 273
 274         int                     count;
 275         int                     pm_state;
 276         struct uart_info        *info;
 277         struct uart_port        *port;
 278
 279         struct semaphore        sem;
 280 };
 281
 282 #define UART_XMIT_SIZE  PAGE_SIZE
 283 /*
 284  * This is the state information which is only valid when the port
 285  * is open; it may be freed by the core driver once the device has
 286  * been closed.  Either the low level driver or the core can modify
 287  * stuff here.
 288  */
 289 struct uart_info {
 290         struct tty_struct       *tty;
 291         struct circ_buf         xmit;
 292         unsigned int            flags;
 293
 294 /*
 295  * These are the flags that specific to info->flags, and reflect our
 296  * internal state.  They can not be accessed via port->flags.  Low
 297  * level drivers must not change these, but may query them instead.
 298  */
 299 #define UIF_CHECK_CD            (1 << 25)
 300 #define UIF_CTS_FLOW            (1 << 26)
 301 #define UIF_NORMAL_ACTIVE       (1 << 29)
 302 #define UIF_INITIALIZED         (1 << 31)
 303
 304         int                     blocked_open;
 305
 306         struct tasklet_struct   tlet;
 307
 308         wait_queue_head_t       open_wait;
 309         wait_queue_head_t       delta_msr_wait;
 310 };
 311
 312 /* number of characters left in xmit buffer before we ask for more */
 313 #define WAKEUP_CHARS            256
 314
 315 struct module;
 316 struct tty_driver;
 317
 318 struct uart_driver {
 319         struct module           *owner;
 320         const char              *driver_name;
 321         const char              *dev_name;
 322         const char              *devfs_name;
 323         int                      major;
 324         int                      minor;
 325         int                      nr;
 326         struct console          *cons;
 327
 328         /*
 329          * these are private; the low level driver should not
 330          * touch these; they should be initialised to NULL
 331          */
 332         struct uart_state       *state;
 333         struct tty_driver       *tty_driver;
 334 };
 335
 336 void uart_write_wakeup(struct uart_port *port);
 337
 338 /*
 339  * Baud rate helpers.
 340  */
 341 void uart_update_timeout(struct uart_port *port, unsigned int cflag,
 342                          unsigned int baud);
 343 unsigned int uart_get_baud_rate(struct uart_port *port, struct termios *termios,
 344                                 struct termios *old, unsigned int min,
 345                                 unsigned int max);
 346 unsigned int uart_get_divisor(struct uart_port *port, unsigned int baud);
 347
 348 /*
 349  * Console helpers.
 350  */
 351 struct uart_port *uart_get_console(struct uart_port *ports, int nr,
 352                                    struct console *c);
 353 void uart_parse_options(char *options, int *baud, int *parity, int *bits,
 354                         int *flow);
 355 int uart_set_options(struct uart_port *port, struct console *co, int baud,
 356                      int parity, int bits, int flow);
 357 struct tty_driver *uart_console_device(struct console *co, int *index);
 358
 359 /*
 360  * Port/driver registration/removal
 361  */
 362 int uart_register_driver(struct uart_driver *uart);
 363 void uart_unregister_driver(struct uart_driver *uart);
 364 int uart_add_one_port(struct uart_driver *reg, struct uart_port *port);
 365 int uart_remove_one_port(struct uart_driver *reg, struct uart_port *port);
 366 int uart_match_port(struct uart_port *port1, struct uart_port *port2);
 367
 368 /*
 369  * Power Management
 370  */
 371 int uart_suspend_port(struct uart_driver *reg, struct uart_port *port);
 372 int uart_resume_port(struct uart_driver *reg, struct uart_port *port);
 373
 374 #define uart_circ_empty(circ)           ((circ)->head == (circ)->tail)
 375 #define uart_circ_clear(circ)           ((circ)->head = (circ)->tail = 0)
 376
 377 #define uart_circ_chars_pending(circ)   \
 378         (CIRC_CNT((circ)->head, (circ)->tail, UART_XMIT_SIZE))
 379
 380 #define uart_circ_chars_free(circ)      \
 381         (CIRC_SPACE((circ)->head, (circ)->tail, UART_XMIT_SIZE))
 382
 383 #define uart_tx_stopped(port)           \
 384         ((port)->info->tty->stopped || (port)->info->tty->hw_stopped)
 385
 386 /*
 387  * The following are helper functions for the low level drivers.
 388  */
 389 static inline int
 390 uart_handle_sysrq_char(struct uart_port *port, unsigned int ch,
 391                        struct pt_regs *regs)
 392 {
 393 #ifdef SUPPORT_SYSRQ
 394         if (port->sysrq) {
 395                 if (ch && time_before(jiffies, port->sysrq)) {
 396                         handle_sysrq(ch, regs, NULL);
 397                         port->sysrq = 0;
 398                         return 1;
 399                 }
 400                 port->sysrq = 0;
 401         }
 402 #endif
 403         return 0;
 404 }
 405 #ifndef SUPPORT_SYSRQ
 406 #define uart_handle_sysrq_char(port,ch,regs) uart_handle_sysrq_char(port, 0, NULL)
 407 #endif
 408
 409 /*
 410  * We do the SysRQ and SAK checking like this...
 411  */
 412 static inline int uart_handle_break(struct uart_port *port)
 413 {
 414         struct uart_info *info = port->info;
 415 #ifdef SUPPORT_SYSRQ
 416         if (port->cons && port->cons->index == port->line) {
 417                 if (!port->sysrq) {
 418                         port->sysrq = jiffies + HZ*5;
 419                         return 1;
 420                 }
 421                 port->sysrq = 0;
 422         }
 423 #endif
 424         if (info->flags & UPF_SAK)
 425                 do_SAK(info->tty);
 426         return 0;
 427 }
 428
 429 /**
 430  *      uart_handle_dcd_change - handle a change of carrier detect state
 431  *      @port: uart_port structure for the open port
 432  *      @status: new carrier detect status, nonzero if active
 433  */
 434 static inline void
 435 uart_handle_dcd_change(struct uart_port *port, unsigned int status)
 436 {
 437         struct uart_info *info = port->info;
 438
 439         port->icount.dcd++;
 440
 441 #ifdef CONFIG_HARD_PPS
 442         if ((port->flags & UPF_HARDPPS_CD) && status)
 443                 hardpps();
 444 #endif
 445
 446         if (info->flags & UIF_CHECK_CD) {
 447                 if (status)
 448                         wake_up_interruptible(&info->open_wait);
 449                 else if (info->tty)
 450                         tty_hangup(info->tty);
 451         }
 452 }
 453
 454 /**
 455  *      uart_handle_cts_change - handle a change of clear-to-send state
 456  *      @port: uart_port structure for the open port
 457  *      @status: new clear to send status, nonzero if active
 458  */
 459 static inline void
 460 uart_handle_cts_change(struct uart_port *port, unsigned int status)
 461 {
 462         struct uart_info *info = port->info;
 463         struct tty_struct *tty = info->tty;
 464
 465         port->icount.cts++;
 466
 467         if (info->flags & UIF_CTS_FLOW) {
 468                 if (tty->hw_stopped) {
 469                         if (status) {
 470                                 tty->hw_stopped = 0;
 471                                 port->ops->start_tx(port);
 472                                 uart_write_wakeup(port);
 473                         }
 474                 } else {
 475                         if (!status) {
 476                                 tty->hw_stopped = 1;
 477                                 port->ops->stop_tx(port);
 478                         }
 479                 }
 480         }
 481 }
 482
 483 #include <linux/tty_flip.h>
 484
 485 static inline void
 486 uart_insert_char(struct uart_port *port, unsigned int status,
 487                  unsigned int overrun, unsigned int ch, unsigned int flag)
 488 {
 489         struct tty_struct *tty = port->info->tty;
 490
 491         if ((status & port->ignore_status_mask & ~overrun) == 0)
 492                 tty_insert_flip_char(tty, ch, flag);
 493
 494         /*
 495          * Overrun is special.  Since it's reported immediately,
 496          * it doesn't affect the current character.
 497          */
 498         if (status & ~port->ignore_status_mask & overrun)
 499                 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
 500 }
 501
 502 /*
 503  *      UART_ENABLE_MS - determine if port should enable modem status irqs
 504  */
 505 #define UART_ENABLE_MS(port,cflag)      ((port)->flags & UPF_HARDPPS_CD || \
 506                                          (cflag) & CRTSCTS || \
 507                                          !((cflag) & CLOCAL))
 508
 509 #endif
 510
 511 #endif /* LINUX_SERIAL_CORE_H */