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