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_OCTEON     17      /* Cavium OCTEON internal UART */
  44 #define PORT_MAX_8250   17      /* max port ID */
  45
  46 /*
  47  * ARM specific type numbers.  These are not currently guaranteed
  48  * to be implemented, and will change in the future.  These are
  49  * separate so any additions to the old serial.c that occur before
  50  * we are merged can be easily merged here.
  51  */
  52 #define PORT_PXA        31
  53 #define PORT_AMBA       32
  54 #define PORT_CLPS711X   33
  55 #define PORT_SA1100     34
  56 #define PORT_UART00     35
  57 #define PORT_21285      37
  58
  59 /* Sparc type numbers.  */
  60 #define PORT_SUNZILOG   38
  61 #define PORT_SUNSAB     39
  62
  63 /* DEC */
  64 #define PORT_DZ         46
  65 #define PORT_ZS         47
  66
  67 /* Parisc type numbers. */
  68 #define PORT_MUX        48
  69
  70 /* Atmel AT91 / AT32 SoC */
  71 #define PORT_ATMEL      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_PNX8XXX    70
 126
 127 /* Hilscher netx */
 128 #define PORT_NETX       71
 129
 130 /* SUN4V Hypervisor Console */
 131 #define PORT_SUNHV      72
 132
 133 #define PORT_S3C2412    73
 134
 135 /* Xilinx uartlite */
 136 #define PORT_UARTLITE   74
 137
 138 /* Blackfin bf5xx */
 139 #define PORT_BFIN       75
 140
 141 /* Micrel KS8695 */
 142 #define PORT_KS8695     76
 143
 144 /* Broadcom SB1250, etc. SOC */
 145 #define PORT_SB1250_DUART       77
 146
 147 /* Freescale ColdFire */
 148 #define PORT_MCF        78
 149
 150 /* Blackfin SPORT */
 151 #define PORT_BFIN_SPORT         79
 152
 153 /* MN10300 on-chip UART numbers */
 154 #define PORT_MN10300            80
 155 #define PORT_MN10300_CTS        81
 156
 157 #define PORT_SC26XX     82
 158
 159 /* SH-SCI */
 160 #define PORT_SCIFA      83
 161
 162 #define PORT_S3C6400    84
 163
 164 #ifdef __KERNEL__
 165
 166 #include <linux/compiler.h>
 167 #include <linux/interrupt.h>
 168 #include <linux/circ_buf.h>
 169 #include <linux/spinlock.h>
 170 #include <linux/sched.h>
 171 #include <linux/tty.h>
 172 #include <linux/mutex.h>
 173 #include <linux/sysrq.h>
 174
 175 struct uart_port;
 176 struct uart_info;
 177 struct serial_struct;
 178 struct device;
 179
 180 /*
 181  * This structure describes all the operations that can be
 182  * done on the physical hardware.
 183  */
 184 struct uart_ops {
 185         unsigned int    (*tx_empty)(struct uart_port *);
 186         void            (*set_mctrl)(struct uart_port *, unsigned int mctrl);
 187         unsigned int    (*get_mctrl)(struct uart_port *);
 188         void            (*stop_tx)(struct uart_port *);
 189         void            (*start_tx)(struct uart_port *);
 190         void            (*send_xchar)(struct uart_port *, char ch);
 191         void            (*stop_rx)(struct uart_port *);
 192         void            (*enable_ms)(struct uart_port *);
 193         void            (*break_ctl)(struct uart_port *, int ctl);
 194         int             (*startup)(struct uart_port *);
 195         void            (*shutdown)(struct uart_port *);
 196         void            (*flush_buffer)(struct uart_port *);
 197         void            (*set_termios)(struct uart_port *, struct ktermios *new,
 198                                        struct ktermios *old);
 199         void            (*set_ldisc)(struct uart_port *);
 200         void            (*pm)(struct uart_port *, unsigned int state,
 201                               unsigned int oldstate);
 202         int             (*set_wake)(struct uart_port *, unsigned int state);
 203
 204         /*
 205          * Return a string describing the type of the port
 206          */
 207         const char *(*type)(struct uart_port *);
 208
 209         /*
 210          * Release IO and memory resources used by the port.
 211          * This includes iounmap if necessary.
 212          */
 213         void            (*release_port)(struct uart_port *);
 214
 215         /*
 216          * Request IO and memory resources used by the port.
 217          * This includes iomapping the port if necessary.
 218          */
 219         int             (*request_port)(struct uart_port *);
 220         void            (*config_port)(struct uart_port *, int);
 221         int             (*verify_port)(struct uart_port *, struct serial_struct *);
 222         int             (*ioctl)(struct uart_port *, unsigned int, unsigned long);
 223 #ifdef CONFIG_CONSOLE_POLL
 224         void    (*poll_put_char)(struct uart_port *, unsigned char);
 225         int             (*poll_get_char)(struct uart_port *);
 226 #endif
 227 };
 228
 229 #define UART_CONFIG_TYPE        (1 << 0)
 230 #define UART_CONFIG_IRQ         (1 << 1)
 231
 232 struct uart_icount {
 233         __u32   cts;
 234         __u32   dsr;
 235         __u32   rng;
 236         __u32   dcd;
 237         __u32   rx;
 238         __u32   tx;
 239         __u32   frame;
 240         __u32   overrun;
 241         __u32   parity;
 242         __u32   brk;
 243         __u32   buf_overrun;
 244 };
 245
 246 typedef unsigned int __bitwise__ upf_t;
 247
 248 struct uart_port {
 249         spinlock_t              lock;                   /* port lock */
 250         unsigned long           iobase;                 /* in/out[bwl] */
 251         unsigned char __iomem   *membase;               /* read/write[bwl] */
 252         unsigned int            (*serial_in)(struct uart_port *, int);
 253         void                    (*serial_out)(struct uart_port *, int, int);
 254         unsigned int            irq;                    /* irq number */
 255         unsigned int            uartclk;                /* base uart clock */
 256         unsigned int            fifosize;               /* tx fifo size */
 257         unsigned char           x_char;                 /* xon/xoff char */
 258         unsigned char           regshift;               /* reg offset shift */
 259         unsigned char           iotype;                 /* io access style */
 260         unsigned char           unused1;
 261
 262 #define UPIO_PORT               (0)
 263 #define UPIO_HUB6               (1)
 264 #define UPIO_MEM                (2)
 265 #define UPIO_MEM32              (3)
 266 #define UPIO_AU                 (4)                     /* Au1x00 type IO */
 267 #define UPIO_TSI                (5)                     /* Tsi108/109 type IO */
 268 #define UPIO_DWAPB              (6)                     /* DesignWare APB UART */
 269 #define UPIO_RM9000             (7)                     /* RM9000 type IO */
 270
 271         unsigned int            read_status_mask;       /* driver specific */
 272         unsigned int            ignore_status_mask;     /* driver specific */
 273         struct uart_info        *info;                  /* pointer to parent info */
 274         struct uart_icount      icount;                 /* statistics */
 275
 276         struct console          *cons;                  /* struct console, if any */
 277 #ifdef CONFIG_SERIAL_CORE_CONSOLE
 278         unsigned long           sysrq;                  /* sysrq timeout */
 279 #endif
 280
 281         upf_t                   flags;
 282
 283 #define UPF_FOURPORT            ((__force upf_t) (1 << 1))
 284 #define UPF_SAK                 ((__force upf_t) (1 << 2))
 285 #define UPF_SPD_MASK            ((__force upf_t) (0x1030))
 286 #define UPF_SPD_HI              ((__force upf_t) (0x0010))
 287 #define UPF_SPD_VHI             ((__force upf_t) (0x0020))
 288 #define UPF_SPD_CUST            ((__force upf_t) (0x0030))
 289 #define UPF_SPD_SHI             ((__force upf_t) (0x1000))
 290 #define UPF_SPD_WARP            ((__force upf_t) (0x1010))
 291 #define UPF_SKIP_TEST           ((__force upf_t) (1 << 6))
 292 #define UPF_AUTO_IRQ            ((__force upf_t) (1 << 7))
 293 #define UPF_HARDPPS_CD          ((__force upf_t) (1 << 11))
 294 #define UPF_LOW_LATENCY         ((__force upf_t) (1 << 13))
 295 #define UPF_BUGGY_UART          ((__force upf_t) (1 << 14))
 296 #define UPF_MAGIC_MULTIPLIER    ((__force upf_t) (1 << 16))
 297 #define UPF_CONS_FLOW           ((__force upf_t) (1 << 23))
 298 #define UPF_SHARE_IRQ           ((__force upf_t) (1 << 24))
 299 /* The exact UART type is known and should not be probed.  */
 300 #define UPF_FIXED_TYPE          ((__force upf_t) (1 << 27))
 301 #define UPF_BOOT_AUTOCONF       ((__force upf_t) (1 << 28))
 302 #define UPF_FIXED_PORT          ((__force upf_t) (1 << 29))
 303 #define UPF_DEAD                ((__force upf_t) (1 << 30))
 304 #define UPF_IOREMAP             ((__force upf_t) (1 << 31))
 305
 306 #define UPF_CHANGE_MASK         ((__force upf_t) (0x17fff))
 307 #define UPF_USR_MASK            ((__force upf_t) (UPF_SPD_MASK|UPF_LOW_LATENCY))
 308
 309         unsigned int            mctrl;                  /* current modem ctrl settings */
 310         unsigned int            timeout;                /* character-based timeout */
 311         unsigned int            type;                   /* port type */
 312         const struct uart_ops   *ops;
 313         unsigned int            custom_divisor;
 314         unsigned int            line;                   /* port index */
 315         resource_size_t         mapbase;                /* for ioremap */
 316         struct device           *dev;                   /* parent device */
 317         unsigned char           hub6;                   /* this should be in the 8250 driver */
 318         unsigned char           suspended;
 319         unsigned char           unused[2];
 320         void                    *private_data;          /* generic platform data pointer */
 321 };
 322
 323 /*
 324  * This is the state information which is only valid when the port
 325  * is open; it may be cleared the core driver once the device has
 326  * been closed.  Either the low level driver or the core can modify
 327  * stuff here.
 328  */
 329 typedef unsigned int __bitwise__ uif_t;
 330
 331 struct uart_info {
 332         struct tty_port         port;
 333         struct circ_buf         xmit;
 334         uif_t                   flags;
 335
 336 /*
 337  * Definitions for info->flags.  These are _private_ to serial_core, and
 338  * are specific to this structure.  They may be queried by low level drivers.
 339  *
 340  * FIXME: use the ASY_ definitions
 341  */
 342 #define UIF_CHECK_CD            ((__force uif_t) (1 << 25))
 343 #define UIF_CTS_FLOW            ((__force uif_t) (1 << 26))
 344 #define UIF_NORMAL_ACTIVE       ((__force uif_t) (1 << 29))
 345 #define UIF_INITIALIZED         ((__force uif_t) (1 << 31))
 346 #define UIF_SUSPENDED           ((__force uif_t) (1 << 30))
 347
 348         struct tasklet_struct   tlet;
 349         wait_queue_head_t       delta_msr_wait;
 350 };
 351
 352 /*
 353  * This is the state information which is persistent across opens.
 354  * The low level driver must not to touch any elements contained
 355  * within.
 356  */
 357 struct uart_state {
 358         unsigned int            close_delay;            /* msec */
 359         unsigned int            closing_wait;           /* msec */
 360
 361 #define USF_CLOSING_WAIT_INF    (0)
 362 #define USF_CLOSING_WAIT_NONE   (~0U)
 363
 364         int                     count;
 365         int                     pm_state;
 366         struct uart_info        info;
 367         struct uart_port        *port;
 368
 369         struct mutex            mutex;
 370 };
 371
 372 #define UART_XMIT_SIZE  PAGE_SIZE
 373
 374
 375 /* number of characters left in xmit buffer before we ask for more */
 376 #define WAKEUP_CHARS            256
 377
 378 struct module;
 379 struct tty_driver;
 380
 381 struct uart_driver {
 382         struct module           *owner;
 383         const char              *driver_name;
 384         const char              *dev_name;
 385         int                      major;
 386         int                      minor;
 387         int                      nr;
 388         struct console          *cons;
 389
 390         /*
 391          * these are private; the low level driver should not
 392          * touch these; they should be initialised to NULL
 393          */
 394         struct uart_state       *state;
 395         struct tty_driver       *tty_driver;
 396 };
 397
 398 void uart_write_wakeup(struct uart_port *port);
 399
 400 /*
 401  * Baud rate helpers.
 402  */
 403 void uart_update_timeout(struct uart_port *port, unsigned int cflag,
 404                          unsigned int baud);
 405 unsigned int uart_get_baud_rate(struct uart_port *port, struct ktermios *termios,
 406                                 struct ktermios *old, unsigned int min,
 407                                 unsigned int max);
 408 unsigned int uart_get_divisor(struct uart_port *port, unsigned int baud);
 409
 410 /*
 411  * Console helpers.
 412  */
 413 struct uart_port *uart_get_console(struct uart_port *ports, int nr,
 414                                    struct console *c);
 415 void uart_parse_options(char *options, int *baud, int *parity, int *bits,
 416                         int *flow);
 417 int uart_set_options(struct uart_port *port, struct console *co, int baud,
 418                      int parity, int bits, int flow);
 419 struct tty_driver *uart_console_device(struct console *co, int *index);
 420 void uart_console_write(struct uart_port *port, const char *s,
 421                         unsigned int count,
 422                         void (*putchar)(struct uart_port *, int));
 423
 424 /*
 425  * Port/driver registration/removal
 426  */
 427 int uart_register_driver(struct uart_driver *uart);
 428 void uart_unregister_driver(struct uart_driver *uart);
 429 int uart_add_one_port(struct uart_driver *reg, struct uart_port *port);
 430 int uart_remove_one_port(struct uart_driver *reg, struct uart_port *port);
 431 int uart_match_port(struct uart_port *port1, struct uart_port *port2);
 432
 433 /*
 434  * Power Management
 435  */
 436 int uart_suspend_port(struct uart_driver *reg, struct uart_port *port);
 437 int uart_resume_port(struct uart_driver *reg, struct uart_port *port);
 438
 439 #define uart_circ_empty(circ)           ((circ)->head == (circ)->tail)
 440 #define uart_circ_clear(circ)           ((circ)->head = (circ)->tail = 0)
 441
 442 #define uart_circ_chars_pending(circ)   \
 443         (CIRC_CNT((circ)->head, (circ)->tail, UART_XMIT_SIZE))
 444
 445 #define uart_circ_chars_free(circ)      \
 446         (CIRC_SPACE((circ)->head, (circ)->tail, UART_XMIT_SIZE))
 447
 448 static inline int uart_tx_stopped(struct uart_port *port)
 449 {
 450         struct tty_struct *tty = port->info->port.tty;
 451         if(tty->stopped || tty->hw_stopped)
 452                 return 1;
 453         return 0;
 454 }
 455
 456 /*
 457  * The following are helper functions for the low level drivers.
 458  */
 459 static inline int
 460 uart_handle_sysrq_char(struct uart_port *port, unsigned int ch)
 461 {
 462 #ifdef SUPPORT_SYSRQ
 463         if (port->sysrq) {
 464                 if (ch && time_before(jiffies, port->sysrq)) {
 465                         handle_sysrq(ch, port->info->port.tty);
 466                         port->sysrq = 0;
 467                         return 1;
 468                 }
 469                 port->sysrq = 0;
 470         }
 471 #endif
 472         return 0;
 473 }
 474 #ifndef SUPPORT_SYSRQ
 475 #define uart_handle_sysrq_char(port,ch) uart_handle_sysrq_char(port, 0)
 476 #endif
 477
 478 /*
 479  * We do the SysRQ and SAK checking like this...
 480  */
 481 static inline int uart_handle_break(struct uart_port *port)
 482 {
 483         struct uart_info *info = port->info;
 484 #ifdef SUPPORT_SYSRQ
 485         if (port->cons && port->cons->index == port->line) {
 486                 if (!port->sysrq) {
 487                         port->sysrq = jiffies + HZ*5;
 488                         return 1;
 489                 }
 490                 port->sysrq = 0;
 491         }
 492 #endif
 493         if (port->flags & UPF_SAK)
 494                 do_SAK(info->port.tty);
 495         return 0;
 496 }
 497
 498 /**
 499  *      uart_handle_dcd_change - handle a change of carrier detect state
 500  *      @port: uart_port structure for the open port
 501  *      @status: new carrier detect status, nonzero if active
 502  */
 503 static inline void
 504 uart_handle_dcd_change(struct uart_port *port, unsigned int status)
 505 {
 506         struct uart_info *info = port->info;
 507
 508         port->icount.dcd++;
 509
 510 #ifdef CONFIG_HARD_PPS
 511         if ((port->flags & UPF_HARDPPS_CD) && status)
 512                 hardpps();
 513 #endif
 514
 515         if (info->flags & UIF_CHECK_CD) {
 516                 if (status)
 517                         wake_up_interruptible(&info->port.open_wait);
 518                 else if (info->port.tty)
 519                         tty_hangup(info->port.tty);
 520         }
 521 }
 522
 523 /**
 524  *      uart_handle_cts_change - handle a change of clear-to-send state
 525  *      @port: uart_port structure for the open port
 526  *      @status: new clear to send status, nonzero if active
 527  */
 528 static inline void
 529 uart_handle_cts_change(struct uart_port *port, unsigned int status)
 530 {
 531         struct uart_info *info = port->info;
 532         struct tty_struct *tty = info->port.tty;
 533
 534         port->icount.cts++;
 535
 536         if (info->flags & UIF_CTS_FLOW) {
 537                 if (tty->hw_stopped) {
 538                         if (status) {
 539                                 tty->hw_stopped = 0;
 540                                 port->ops->start_tx(port);
 541                                 uart_write_wakeup(port);
 542                         }
 543                 } else {
 544                         if (!status) {
 545                                 tty->hw_stopped = 1;
 546                                 port->ops->stop_tx(port);
 547                         }
 548                 }
 549         }
 550 }
 551
 552 #include <linux/tty_flip.h>
 553
 554 static inline void
 555 uart_insert_char(struct uart_port *port, unsigned int status,
 556                  unsigned int overrun, unsigned int ch, unsigned int flag)
 557 {
 558         struct tty_struct *tty = port->info->port.tty;
 559
 560         if ((status & port->ignore_status_mask & ~overrun) == 0)
 561                 tty_insert_flip_char(tty, ch, flag);
 562
 563         /*
 564          * Overrun is special.  Since it's reported immediately,
 565          * it doesn't affect the current character.
 566          */
 567         if (status & ~port->ignore_status_mask & overrun)
 568                 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
 569 }
 570
 571 /*
 572  *      UART_ENABLE_MS - determine if port should enable modem status irqs
 573  */
 574 #define UART_ENABLE_MS(port,cflag)      ((port)->flags & UPF_HARDPPS_CD || \
 575                                          (cflag) & CRTSCTS || \
 576                                          !((cflag) & CLOCAL))
 577
 578 #endif
 579
 580 #endif /* LINUX_SERIAL_CORE_H */