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