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_RM9000     16      /* PMC-Sierra RM9xxx internal UART */
  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 /* DEC */
  66 #define PORT_DZ         46
  67 #define PORT_ZS         47
  68
  69 /* Parisc type numbers. */
  70 #define PORT_MUX        48
  71
  72 /* Atmel AT91 / AT32 SoC */
  73 #define PORT_ATMEL      49
  74
  75 /* Macintosh Zilog type numbers */
  76 #define PORT_MAC_ZILOG  50      /* m68k : not yet implemented */
  77 #define PORT_PMAC_ZILOG 51
  78
  79 /* SH-SCI */
  80 #define PORT_SCI        52
  81 #define PORT_SCIF       53
  82 #define PORT_IRDA       54
  83
  84 /* Samsung S3C2410 SoC and derivatives thereof */
  85 #define PORT_S3C2410    55
  86
  87 /* SGI IP22 aka Indy / Challenge S / Indigo 2 */
  88 #define PORT_IP22ZILOG  56
  89
  90 /* Sharp LH7a40x -- an ARM9 SoC series */
  91 #define PORT_LH7A40X    57
  92
  93 /* PPC CPM type number */
  94 #define PORT_CPM        58
  95
  96 /* MPC52xx type numbers */
  97 #define PORT_MPC52xx    59
  98
  99 /* IBM icom */
 100 #define PORT_ICOM       60
 101
 102 /* Samsung S3C2440 SoC */
 103 #define PORT_S3C2440    61
 104
 105 /* Motorola i.MX SoC */
 106 #define PORT_IMX        62
 107
 108 /* Marvell MPSC */
 109 #define PORT_MPSC       63
 110
 111 /* TXX9 type number */
 112 #define PORT_TXX9       64
 113
 114 /* NEC VR4100 series SIU/DSIU */
 115 #define PORT_VR41XX_SIU         65
 116 #define PORT_VR41XX_DSIU        66
 117
 118 /* Samsung S3C2400 SoC */
 119 #define PORT_S3C2400    67
 120
 121 /* M32R SIO */
 122 #define PORT_M32R_SIO   68
 123
 124 /*Digi jsm */
 125 #define PORT_JSM        69
 126
 127 #define PORT_PNX8XXX    70
 128
 129 /* Hilscher netx */
 130 #define PORT_NETX       71
 131
 132 /* SUN4V Hypervisor Console */
 133 #define PORT_SUNHV      72
 134
 135 #define PORT_S3C2412    73
 136
 137 /* Xilinx uartlite */
 138 #define PORT_UARTLITE   74
 139
 140 /* Blackfin bf5xx */
 141 #define PORT_BFIN       75
 142
 143 /* Micrel KS8695 */
 144 #define PORT_KS8695     76
 145
 146 /* Broadcom SB1250, etc. SOC */
 147 #define PORT_SB1250_DUART       77
 148
 149 /* Freescale ColdFire */
 150 #define PORT_MCF        78
 151
 152
 153 /* MN10300 on-chip UART numbers */
 154 #define PORT_MN10300            80
 155 #define PORT_MN10300_CTS        81
 156
 157 #ifdef __KERNEL__
 158
 159 #include <linux/compiler.h>
 160 #include <linux/interrupt.h>
 161 #include <linux/circ_buf.h>
 162 #include <linux/spinlock.h>
 163 #include <linux/sched.h>
 164 #include <linux/tty.h>
 165 #include <linux/mutex.h>
 166 #include <linux/sysrq.h>
 167
 168 struct uart_port;
 169 struct uart_info;
 170 struct serial_struct;
 171 struct device;
 172
 173 /*
 174  * This structure describes all the operations that can be
 175  * done on the physical hardware.
 176  */
 177 struct uart_ops {
 178         unsigned int    (*tx_empty)(struct uart_port *);
 179         void            (*set_mctrl)(struct uart_port *, unsigned int mctrl);
 180         unsigned int    (*get_mctrl)(struct uart_port *);
 181         void            (*stop_tx)(struct uart_port *);
 182         void            (*start_tx)(struct uart_port *);
 183         void            (*send_xchar)(struct uart_port *, char ch);
 184         void            (*stop_rx)(struct uart_port *);
 185         void            (*enable_ms)(struct uart_port *);
 186         void            (*break_ctl)(struct uart_port *, int ctl);
 187         int             (*startup)(struct uart_port *);
 188         void            (*shutdown)(struct uart_port *);
 189         void            (*set_termios)(struct uart_port *, struct ktermios *new,
 190                                        struct ktermios *old);
 191         void            (*pm)(struct uart_port *, unsigned int state,
 192                               unsigned int oldstate);
 193         int             (*set_wake)(struct uart_port *, unsigned int state);
 194
 195         /*
 196          * Return a string describing the type of the port
 197          */
 198         const char *(*type)(struct uart_port *);
 199
 200         /*
 201          * Release IO and memory resources used by the port.
 202          * This includes iounmap if necessary.
 203          */
 204         void            (*release_port)(struct uart_port *);
 205
 206         /*
 207          * Request IO and memory resources used by the port.
 208          * This includes iomapping the port if necessary.
 209          */
 210         int             (*request_port)(struct uart_port *);
 211         void            (*config_port)(struct uart_port *, int);
 212         int             (*verify_port)(struct uart_port *, struct serial_struct *);
 213         int             (*ioctl)(struct uart_port *, unsigned int, unsigned long);
 214 };
 215
 216 #define UART_CONFIG_TYPE        (1 << 0)
 217 #define UART_CONFIG_IRQ         (1 << 1)
 218
 219 struct uart_icount {
 220         __u32   cts;
 221         __u32   dsr;
 222         __u32   rng;
 223         __u32   dcd;
 224         __u32   rx;
 225         __u32   tx;
 226         __u32   frame;
 227         __u32   overrun;
 228         __u32   parity;
 229         __u32   brk;
 230         __u32   buf_overrun;
 231 };
 232
 233 typedef unsigned int __bitwise__ upf_t;
 234
 235 struct uart_port {
 236         spinlock_t              lock;                   /* port lock */
 237         unsigned int            iobase;                 /* in/out[bwl] */
 238         unsigned char __iomem   *membase;               /* read/write[bwl] */
 239         unsigned int            irq;                    /* irq number */
 240         unsigned int            uartclk;                /* base uart clock */
 241         unsigned int            fifosize;               /* tx fifo size */
 242         unsigned char           x_char;                 /* xon/xoff char */
 243         unsigned char           regshift;               /* reg offset shift */
 244         unsigned char           iotype;                 /* io access style */
 245         unsigned char           unused1;
 246
 247 #define UPIO_PORT               (0)
 248 #define UPIO_HUB6               (1)
 249 #define UPIO_MEM                (2)
 250 #define UPIO_MEM32              (3)
 251 #define UPIO_AU                 (4)                     /* Au1x00 type IO */
 252 #define UPIO_TSI                (5)                     /* Tsi108/109 type IO */
 253 #define UPIO_DWAPB              (6)                     /* DesignWare APB UART */
 254 #define UPIO_RM9000             (7)                     /* RM9000 type IO */
 255
 256         unsigned int            read_status_mask;       /* driver specific */
 257         unsigned int            ignore_status_mask;     /* driver specific */
 258         struct uart_info        *info;                  /* pointer to parent info */
 259         struct uart_icount      icount;                 /* statistics */
 260
 261         struct console          *cons;                  /* struct console, if any */
 262 #ifdef CONFIG_SERIAL_CORE_CONSOLE
 263         unsigned long           sysrq;                  /* sysrq timeout */
 264 #endif
 265
 266         upf_t                   flags;
 267
 268 #define UPF_FOURPORT            ((__force upf_t) (1 << 1))
 269 #define UPF_SAK                 ((__force upf_t) (1 << 2))
 270 #define UPF_SPD_MASK            ((__force upf_t) (0x1030))
 271 #define UPF_SPD_HI              ((__force upf_t) (0x0010))
 272 #define UPF_SPD_VHI             ((__force upf_t) (0x0020))
 273 #define UPF_SPD_CUST            ((__force upf_t) (0x0030))
 274 #define UPF_SPD_SHI             ((__force upf_t) (0x1000))
 275 #define UPF_SPD_WARP            ((__force upf_t) (0x1010))
 276 #define UPF_SKIP_TEST           ((__force upf_t) (1 << 6))
 277 #define UPF_AUTO_IRQ            ((__force upf_t) (1 << 7))
 278 #define UPF_HARDPPS_CD          ((__force upf_t) (1 << 11))
 279 #define UPF_LOW_LATENCY         ((__force upf_t) (1 << 13))
 280 #define UPF_BUGGY_UART          ((__force upf_t) (1 << 14))
 281 #define UPF_MAGIC_MULTIPLIER    ((__force upf_t) (1 << 16))
 282 #define UPF_CONS_FLOW           ((__force upf_t) (1 << 23))
 283 #define UPF_SHARE_IRQ           ((__force upf_t) (1 << 24))
 284 #define UPF_BOOT_AUTOCONF       ((__force upf_t) (1 << 28))
 285 #define UPF_FIXED_PORT          ((__force upf_t) (1 << 29))
 286 #define UPF_DEAD                ((__force upf_t) (1 << 30))
 287 #define UPF_IOREMAP             ((__force upf_t) (1 << 31))
 288
 289 #define UPF_CHANGE_MASK         ((__force upf_t) (0x17fff))
 290 #define UPF_USR_MASK            ((__force upf_t) (UPF_SPD_MASK|UPF_LOW_LATENCY))
 291
 292         unsigned int            mctrl;                  /* current modem ctrl settings */
 293         unsigned int            timeout;                /* character-based timeout */
 294         unsigned int            type;                   /* port type */
 295         const struct uart_ops   *ops;
 296         unsigned int            custom_divisor;
 297         unsigned int            line;                   /* port index */
 298         resource_size_t         mapbase;                /* for ioremap */
 299         struct device           *dev;                   /* parent device */
 300         unsigned char           hub6;                   /* this should be in the 8250 driver */
 301         unsigned char           suspended;
 302         unsigned char           unused[2];
 303         void                    *private_data;          /* generic platform data pointer */
 304 };
 305
 306 /*
 307  * This is the state information which is persistent across opens.
 308  * The low level driver must not to touch any elements contained
 309  * within.
 310  */
 311 struct uart_state {
 312         unsigned int            close_delay;            /* msec */
 313         unsigned int            closing_wait;           /* msec */
 314
 315 #define USF_CLOSING_WAIT_INF    (0)
 316 #define USF_CLOSING_WAIT_NONE   (~0U)
 317
 318         int                     count;
 319         int                     pm_state;
 320         struct uart_info        *info;
 321         struct uart_port        *port;
 322
 323         struct mutex            mutex;
 324 };
 325
 326 #define UART_XMIT_SIZE  PAGE_SIZE
 327
 328 typedef unsigned int __bitwise__ uif_t;
 329
 330 /*
 331  * This is the state information which is only valid when the port
 332  * is open; it may be freed by the core driver once the device has
 333  * been closed.  Either the low level driver or the core can modify
 334  * stuff here.
 335  */
 336 struct uart_info {
 337         struct tty_struct       *tty;
 338         struct circ_buf         xmit;
 339         uif_t                   flags;
 340
 341 /*
 342  * Definitions for info->flags.  These are _private_ to serial_core, and
 343  * are specific to this structure.  They may be queried by low level drivers.
 344  */
 345 #define UIF_CHECK_CD            ((__force uif_t) (1 << 25))
 346 #define UIF_CTS_FLOW            ((__force uif_t) (1 << 26))
 347 #define UIF_NORMAL_ACTIVE       ((__force uif_t) (1 << 29))
 348 #define UIF_INITIALIZED         ((__force uif_t) (1 << 31))
 349 #define UIF_SUSPENDED           ((__force uif_t) (1 << 30))
 350
 351         int                     blocked_open;
 352
 353         struct tasklet_struct   tlet;
 354
 355         wait_queue_head_t       open_wait;
 356         wait_queue_head_t       delta_msr_wait;
 357 };
 358
 359 /* number of characters left in xmit buffer before we ask for more */
 360 #define WAKEUP_CHARS            256
 361
 362 struct module;
 363 struct tty_driver;
 364
 365 struct uart_driver {
 366         struct module           *owner;
 367         const char              *driver_name;
 368         const char              *dev_name;
 369         int                      major;
 370         int                      minor;
 371         int                      nr;
 372         struct console          *cons;
 373
 374         /*
 375          * these are private; the low level driver should not
 376          * touch these; they should be initialised to NULL
 377          */
 378         struct uart_state       *state;
 379         struct tty_driver       *tty_driver;
 380 };
 381
 382 void uart_write_wakeup(struct uart_port *port);
 383
 384 /*
 385  * Baud rate helpers.
 386  */
 387 void uart_update_timeout(struct uart_port *port, unsigned int cflag,
 388                          unsigned int baud);
 389 unsigned int uart_get_baud_rate(struct uart_port *port, struct ktermios *termios,
 390                                 struct ktermios *old, unsigned int min,
 391                                 unsigned int max);
 392 unsigned int uart_get_divisor(struct uart_port *port, unsigned int baud);
 393
 394 /*
 395  * Console helpers.
 396  */
 397 struct uart_port *uart_get_console(struct uart_port *ports, int nr,
 398                                    struct console *c);
 399 void uart_parse_options(char *options, int *baud, int *parity, int *bits,
 400                         int *flow);
 401 int uart_set_options(struct uart_port *port, struct console *co, int baud,
 402                      int parity, int bits, int flow);
 403 struct tty_driver *uart_console_device(struct console *co, int *index);
 404 void uart_console_write(struct uart_port *port, const char *s,
 405                         unsigned int count,
 406                         void (*putchar)(struct uart_port *, int));
 407
 408 /*
 409  * Port/driver registration/removal
 410  */
 411 int uart_register_driver(struct uart_driver *uart);
 412 void uart_unregister_driver(struct uart_driver *uart);
 413 int uart_add_one_port(struct uart_driver *reg, struct uart_port *port);
 414 int uart_remove_one_port(struct uart_driver *reg, struct uart_port *port);
 415 int uart_match_port(struct uart_port *port1, struct uart_port *port2);
 416
 417 /*
 418  * Power Management
 419  */
 420 int uart_suspend_port(struct uart_driver *reg, struct uart_port *port);
 421 int uart_resume_port(struct uart_driver *reg, struct uart_port *port);
 422
 423 #define uart_circ_empty(circ)           ((circ)->head == (circ)->tail)
 424 #define uart_circ_clear(circ)           ((circ)->head = (circ)->tail = 0)
 425
 426 #define uart_circ_chars_pending(circ)   \
 427         (CIRC_CNT((circ)->head, (circ)->tail, UART_XMIT_SIZE))
 428
 429 #define uart_circ_chars_free(circ)      \
 430         (CIRC_SPACE((circ)->head, (circ)->tail, UART_XMIT_SIZE))
 431
 432 #define uart_tx_stopped(port)           \
 433         ((port)->info->tty->stopped || (port)->info->tty->hw_stopped)
 434
 435 /*
 436  * The following are helper functions for the low level drivers.
 437  */
 438 static inline int
 439 uart_handle_sysrq_char(struct uart_port *port, unsigned int ch)
 440 {
 441 #ifdef SUPPORT_SYSRQ
 442         if (port->sysrq) {
 443                 if (ch && time_before(jiffies, port->sysrq)) {
 444                         handle_sysrq(ch, port->info ? port->info->tty : NULL);
 445                         port->sysrq = 0;
 446                         return 1;
 447                 }
 448                 port->sysrq = 0;
 449         }
 450 #endif
 451         return 0;
 452 }
 453 #ifndef SUPPORT_SYSRQ
 454 #define uart_handle_sysrq_char(port,ch) uart_handle_sysrq_char(port, 0)
 455 #endif
 456
 457 /*
 458  * We do the SysRQ and SAK checking like this...
 459  */
 460 static inline int uart_handle_break(struct uart_port *port)
 461 {
 462         struct uart_info *info = port->info;
 463 #ifdef SUPPORT_SYSRQ
 464         if (port->cons && port->cons->index == port->line) {
 465                 if (!port->sysrq) {
 466                         port->sysrq = jiffies + HZ*5;
 467                         return 1;
 468                 }
 469                 port->sysrq = 0;
 470         }
 471 #endif
 472         if (port->flags & UPF_SAK)
 473                 do_SAK(info->tty);
 474         return 0;
 475 }
 476
 477 /**
 478  *      uart_handle_dcd_change - handle a change of carrier detect state
 479  *      @port: uart_port structure for the open port
 480  *      @status: new carrier detect status, nonzero if active
 481  */
 482 static inline void
 483 uart_handle_dcd_change(struct uart_port *port, unsigned int status)
 484 {
 485         struct uart_info *info = port->info;
 486
 487         port->icount.dcd++;
 488
 489 #ifdef CONFIG_HARD_PPS
 490         if ((port->flags & UPF_HARDPPS_CD) && status)
 491                 hardpps();
 492 #endif
 493
 494         if (info->flags & UIF_CHECK_CD) {
 495                 if (status)
 496                         wake_up_interruptible(&info->open_wait);
 497                 else if (info->tty)
 498                         tty_hangup(info->tty);
 499         }
 500 }
 501
 502 /**
 503  *      uart_handle_cts_change - handle a change of clear-to-send state
 504  *      @port: uart_port structure for the open port
 505  *      @status: new clear to send status, nonzero if active
 506  */
 507 static inline void
 508 uart_handle_cts_change(struct uart_port *port, unsigned int status)
 509 {
 510         struct uart_info *info = port->info;
 511         struct tty_struct *tty = info->tty;
 512
 513         port->icount.cts++;
 514
 515         if (info->flags & UIF_CTS_FLOW) {
 516                 if (tty->hw_stopped) {
 517                         if (status) {
 518                                 tty->hw_stopped = 0;
 519                                 port->ops->start_tx(port);
 520                                 uart_write_wakeup(port);
 521                         }
 522                 } else {
 523                         if (!status) {
 524                                 tty->hw_stopped = 1;
 525                                 port->ops->stop_tx(port);
 526                         }
 527                 }
 528         }
 529 }
 530
 531 #include <linux/tty_flip.h>
 532
 533 static inline void
 534 uart_insert_char(struct uart_port *port, unsigned int status,
 535                  unsigned int overrun, unsigned int ch, unsigned int flag)
 536 {
 537         struct tty_struct *tty = port->info->tty;
 538
 539         if ((status & port->ignore_status_mask & ~overrun) == 0)
 540                 tty_insert_flip_char(tty, ch, flag);
 541
 542         /*
 543          * Overrun is special.  Since it's reported immediately,
 544          * it doesn't affect the current character.
 545          */
 546         if (status & ~port->ignore_status_mask & overrun)
 547                 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
 548 }
 549
 550 /*
 551  *      UART_ENABLE_MS - determine if port should enable modem status irqs
 552  */
 553 #define UART_ENABLE_MS(port,cflag)      ((port)->flags & UPF_HARDPPS_CD || \
 554                                          (cflag) & CRTSCTS || \
 555                                          !((cflag) & CLOCAL))
 556
 557 #endif
 558
 559 #endif /* LINUX_SERIAL_CORE_H */