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 /* Atmel AT91xxx SoC */
  71 #define PORT_AT91       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_IP3106     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
 136 #ifdef __KERNEL__
 137
 138 #include <linux/compiler.h>
 139 #include <linux/interrupt.h>
 140 #include <linux/circ_buf.h>
 141 #include <linux/spinlock.h>
 142 #include <linux/sched.h>
 143 #include <linux/tty.h>
 144 #include <linux/mutex.h>
 145
 146 struct uart_port;
 147 struct uart_info;
 148 struct serial_struct;
 149 struct device;
 150
 151 /*
 152  * This structure describes all the operations that can be
 153  * done on the physical hardware.
 154  */
 155 struct uart_ops {
 156         unsigned int    (*tx_empty)(struct uart_port *);
 157         void            (*set_mctrl)(struct uart_port *, unsigned int mctrl);
 158         unsigned int    (*get_mctrl)(struct uart_port *);
 159         void            (*stop_tx)(struct uart_port *);
 160         void            (*start_tx)(struct uart_port *);
 161         void            (*send_xchar)(struct uart_port *, char ch);
 162         void            (*stop_rx)(struct uart_port *);
 163         void            (*enable_ms)(struct uart_port *);
 164         void            (*break_ctl)(struct uart_port *, int ctl);
 165         int             (*startup)(struct uart_port *);
 166         void            (*shutdown)(struct uart_port *);
 167         void            (*set_termios)(struct uart_port *, struct termios *new,
 168                                        struct termios *old);
 169         void            (*pm)(struct uart_port *, unsigned int state,
 170                               unsigned int oldstate);
 171         int             (*set_wake)(struct uart_port *, unsigned int state);
 172
 173         /*
 174          * Return a string describing the type of the port
 175          */
 176         const char *(*type)(struct uart_port *);
 177
 178         /*
 179          * Release IO and memory resources used by the port.
 180          * This includes iounmap if necessary.
 181          */
 182         void            (*release_port)(struct uart_port *);
 183
 184         /*
 185          * Request IO and memory resources used by the port.
 186          * This includes iomapping the port if necessary.
 187          */
 188         int             (*request_port)(struct uart_port *);
 189         void            (*config_port)(struct uart_port *, int);
 190         int             (*verify_port)(struct uart_port *, struct serial_struct *);
 191         int             (*ioctl)(struct uart_port *, unsigned int, unsigned long);
 192 };
 193
 194 #define UART_CONFIG_TYPE        (1 << 0)
 195 #define UART_CONFIG_IRQ         (1 << 1)
 196
 197 struct uart_icount {
 198         __u32   cts;
 199         __u32   dsr;
 200         __u32   rng;
 201         __u32   dcd;
 202         __u32   rx;
 203         __u32   tx;
 204         __u32   frame;
 205         __u32   overrun;
 206         __u32   parity;
 207         __u32   brk;
 208         __u32   buf_overrun;
 209 };
 210
 211 typedef unsigned int __bitwise__ upf_t;
 212
 213 struct uart_port {
 214         spinlock_t              lock;                   /* port lock */
 215         unsigned int            iobase;                 /* in/out[bwl] */
 216         unsigned char __iomem   *membase;               /* read/write[bwl] */
 217         unsigned int            irq;                    /* irq number */
 218         unsigned int            uartclk;                /* base uart clock */
 219         unsigned int            fifosize;               /* tx fifo size */
 220         unsigned char           x_char;                 /* xon/xoff char */
 221         unsigned char           regshift;               /* reg offset shift */
 222         unsigned char           iotype;                 /* io access style */
 223         unsigned char           unused1;
 224
 225 #define UPIO_PORT               (0)
 226 #define UPIO_HUB6               (1)
 227 #define UPIO_MEM                (2)
 228 #define UPIO_MEM32              (3)
 229 #define UPIO_AU                 (4)                     /* Au1x00 type IO */
 230 #define UPIO_TSI                (5)                     /* Tsi108/109 type IO */
 231
 232         unsigned int            read_status_mask;       /* driver specific */
 233         unsigned int            ignore_status_mask;     /* driver specific */
 234         struct uart_info        *info;                  /* pointer to parent info */
 235         struct uart_icount      icount;                 /* statistics */
 236
 237         struct console          *cons;                  /* struct console, if any */
 238 #ifdef CONFIG_SERIAL_CORE_CONSOLE
 239         unsigned long           sysrq;                  /* sysrq timeout */
 240 #endif
 241
 242         upf_t                   flags;
 243
 244 #define UPF_FOURPORT            ((__force upf_t) (1 << 1))
 245 #define UPF_SAK                 ((__force upf_t) (1 << 2))
 246 #define UPF_SPD_MASK            ((__force upf_t) (0x1030))
 247 #define UPF_SPD_HI              ((__force upf_t) (0x0010))
 248 #define UPF_SPD_VHI             ((__force upf_t) (0x0020))
 249 #define UPF_SPD_CUST            ((__force upf_t) (0x0030))
 250 #define UPF_SPD_SHI             ((__force upf_t) (0x1000))
 251 #define UPF_SPD_WARP            ((__force upf_t) (0x1010))
 252 #define UPF_SKIP_TEST           ((__force upf_t) (1 << 6))
 253 #define UPF_AUTO_IRQ            ((__force upf_t) (1 << 7))
 254 #define UPF_HARDPPS_CD          ((__force upf_t) (1 << 11))
 255 #define UPF_LOW_LATENCY         ((__force upf_t) (1 << 13))
 256 #define UPF_BUGGY_UART          ((__force upf_t) (1 << 14))
 257 #define UPF_MAGIC_MULTIPLIER    ((__force upf_t) (1 << 16))
 258 #define UPF_CONS_FLOW           ((__force upf_t) (1 << 23))
 259 #define UPF_SHARE_IRQ           ((__force upf_t) (1 << 24))
 260 #define UPF_BOOT_AUTOCONF       ((__force upf_t) (1 << 28))
 261 #define UPF_DEAD                ((__force upf_t) (1 << 30))
 262 #define UPF_IOREMAP             ((__force upf_t) (1 << 31))
 263
 264 #define UPF_CHANGE_MASK         ((__force upf_t) (0x17fff))
 265 #define UPF_USR_MASK            ((__force upf_t) (UPF_SPD_MASK|UPF_LOW_LATENCY))
 266
 267         unsigned int            mctrl;                  /* current modem ctrl settings */
 268         unsigned int            timeout;                /* character-based timeout */
 269         unsigned int            type;                   /* port type */
 270         const struct uart_ops   *ops;
 271         unsigned int            custom_divisor;
 272         unsigned int            line;                   /* port index */
 273         unsigned long           mapbase;                /* for ioremap */
 274         struct device           *dev;                   /* parent device */
 275         unsigned char           hub6;                   /* this should be in the 8250 driver */
 276         unsigned char           unused[3];
 277 };
 278
 279 /*
 280  * This is the state information which is persistent across opens.
 281  * The low level driver must not to touch any elements contained
 282  * within.
 283  */
 284 struct uart_state {
 285         unsigned int            close_delay;            /* msec */
 286         unsigned int            closing_wait;           /* msec */
 287
 288 #define USF_CLOSING_WAIT_INF    (0)
 289 #define USF_CLOSING_WAIT_NONE   (~0U)
 290
 291         int                     count;
 292         int                     pm_state;
 293         struct uart_info        *info;
 294         struct uart_port        *port;
 295
 296         struct mutex            mutex;
 297 };
 298
 299 #define UART_XMIT_SIZE  PAGE_SIZE
 300
 301 typedef unsigned int __bitwise__ uif_t;
 302
 303 /*
 304  * This is the state information which is only valid when the port
 305  * is open; it may be freed by the core driver once the device has
 306  * been closed.  Either the low level driver or the core can modify
 307  * stuff here.
 308  */
 309 struct uart_info {
 310         struct tty_struct       *tty;
 311         struct circ_buf         xmit;
 312         uif_t                   flags;
 313
 314 /*
 315  * Definitions for info->flags.  These are _private_ to serial_core, and
 316  * are specific to this structure.  They may be queried by low level drivers.
 317  */
 318 #define UIF_CHECK_CD            ((__force uif_t) (1 << 25))
 319 #define UIF_CTS_FLOW            ((__force uif_t) (1 << 26))
 320 #define UIF_NORMAL_ACTIVE       ((__force uif_t) (1 << 29))
 321 #define UIF_INITIALIZED         ((__force uif_t) (1 << 31))
 322
 323         int                     blocked_open;
 324
 325         struct tasklet_struct   tlet;
 326
 327         wait_queue_head_t       open_wait;
 328         wait_queue_head_t       delta_msr_wait;
 329 };
 330
 331 /* number of characters left in xmit buffer before we ask for more */
 332 #define WAKEUP_CHARS            256
 333
 334 struct module;
 335 struct tty_driver;
 336
 337 struct uart_driver {
 338         struct module           *owner;
 339         const char              *driver_name;
 340         const char              *dev_name;
 341         int                      major;
 342         int                      minor;
 343         int                      nr;
 344         struct console          *cons;
 345
 346         /*
 347          * these are private; the low level driver should not
 348          * touch these; they should be initialised to NULL
 349          */
 350         struct uart_state       *state;
 351         struct tty_driver       *tty_driver;
 352 };
 353
 354 void uart_write_wakeup(struct uart_port *port);
 355
 356 /*
 357  * Baud rate helpers.
 358  */
 359 void uart_update_timeout(struct uart_port *port, unsigned int cflag,
 360                          unsigned int baud);
 361 unsigned int uart_get_baud_rate(struct uart_port *port, struct termios *termios,
 362                                 struct termios *old, unsigned int min,
 363                                 unsigned int max);
 364 unsigned int uart_get_divisor(struct uart_port *port, unsigned int baud);
 365
 366 /*
 367  * Console helpers.
 368  */
 369 struct uart_port *uart_get_console(struct uart_port *ports, int nr,
 370                                    struct console *c);
 371 void uart_parse_options(char *options, int *baud, int *parity, int *bits,
 372                         int *flow);
 373 int uart_set_options(struct uart_port *port, struct console *co, int baud,
 374                      int parity, int bits, int flow);
 375 struct tty_driver *uart_console_device(struct console *co, int *index);
 376 void uart_console_write(struct uart_port *port, const char *s,
 377                         unsigned int count,
 378                         void (*putchar)(struct uart_port *, int));
 379
 380 /*
 381  * Port/driver registration/removal
 382  */
 383 int uart_register_driver(struct uart_driver *uart);
 384 void uart_unregister_driver(struct uart_driver *uart);
 385 int uart_add_one_port(struct uart_driver *reg, struct uart_port *port);
 386 int uart_remove_one_port(struct uart_driver *reg, struct uart_port *port);
 387 int uart_match_port(struct uart_port *port1, struct uart_port *port2);
 388
 389 /*
 390  * Power Management
 391  */
 392 int uart_suspend_port(struct uart_driver *reg, struct uart_port *port);
 393 int uart_resume_port(struct uart_driver *reg, struct uart_port *port);
 394
 395 #define uart_circ_empty(circ)           ((circ)->head == (circ)->tail)
 396 #define uart_circ_clear(circ)           ((circ)->head = (circ)->tail = 0)
 397
 398 #define uart_circ_chars_pending(circ)   \
 399         (CIRC_CNT((circ)->head, (circ)->tail, UART_XMIT_SIZE))
 400
 401 #define uart_circ_chars_free(circ)      \
 402         (CIRC_SPACE((circ)->head, (circ)->tail, UART_XMIT_SIZE))
 403
 404 #define uart_tx_stopped(port)           \
 405         ((port)->info->tty->stopped || (port)->info->tty->hw_stopped)
 406
 407 /*
 408  * The following are helper functions for the low level drivers.
 409  */
 410 static inline int
 411 uart_handle_sysrq_char(struct uart_port *port, unsigned int ch,
 412                        struct pt_regs *regs)
 413 {
 414 #ifdef SUPPORT_SYSRQ
 415         if (port->sysrq) {
 416                 if (ch && time_before(jiffies, port->sysrq)) {
 417                         handle_sysrq(ch, regs, NULL);
 418                         port->sysrq = 0;
 419                         return 1;
 420                 }
 421                 port->sysrq = 0;
 422         }
 423 #endif
 424         return 0;
 425 }
 426 #ifndef SUPPORT_SYSRQ
 427 #define uart_handle_sysrq_char(port,ch,regs) uart_handle_sysrq_char(port, 0, NULL)
 428 #endif
 429
 430 /*
 431  * We do the SysRQ and SAK checking like this...
 432  */
 433 static inline int uart_handle_break(struct uart_port *port)
 434 {
 435         struct uart_info *info = port->info;
 436 #ifdef SUPPORT_SYSRQ
 437         if (port->cons && port->cons->index == port->line) {
 438                 if (!port->sysrq) {
 439                         port->sysrq = jiffies + HZ*5;
 440                         return 1;
 441                 }
 442                 port->sysrq = 0;
 443         }
 444 #endif
 445         if (port->flags & UPF_SAK)
 446                 do_SAK(info->tty);
 447         return 0;
 448 }
 449
 450 /**
 451  *      uart_handle_dcd_change - handle a change of carrier detect state
 452  *      @port: uart_port structure for the open port
 453  *      @status: new carrier detect status, nonzero if active
 454  */
 455 static inline void
 456 uart_handle_dcd_change(struct uart_port *port, unsigned int status)
 457 {
 458         struct uart_info *info = port->info;
 459
 460         port->icount.dcd++;
 461
 462 #ifdef CONFIG_HARD_PPS
 463         if ((port->flags & UPF_HARDPPS_CD) && status)
 464                 hardpps();
 465 #endif
 466
 467         if (info->flags & UIF_CHECK_CD) {
 468                 if (status)
 469                         wake_up_interruptible(&info->open_wait);
 470                 else if (info->tty)
 471                         tty_hangup(info->tty);
 472         }
 473 }
 474
 475 /**
 476  *      uart_handle_cts_change - handle a change of clear-to-send state
 477  *      @port: uart_port structure for the open port
 478  *      @status: new clear to send status, nonzero if active
 479  */
 480 static inline void
 481 uart_handle_cts_change(struct uart_port *port, unsigned int status)
 482 {
 483         struct uart_info *info = port->info;
 484         struct tty_struct *tty = info->tty;
 485
 486         port->icount.cts++;
 487
 488         if (info->flags & UIF_CTS_FLOW) {
 489                 if (tty->hw_stopped) {
 490                         if (status) {
 491                                 tty->hw_stopped = 0;
 492                                 port->ops->start_tx(port);
 493                                 uart_write_wakeup(port);
 494                         }
 495                 } else {
 496                         if (!status) {
 497                                 tty->hw_stopped = 1;
 498                                 port->ops->stop_tx(port);
 499                         }
 500                 }
 501         }
 502 }
 503
 504 #include <linux/tty_flip.h>
 505
 506 static inline void
 507 uart_insert_char(struct uart_port *port, unsigned int status,
 508                  unsigned int overrun, unsigned int ch, unsigned int flag)
 509 {
 510         struct tty_struct *tty = port->info->tty;
 511
 512         if ((status & port->ignore_status_mask & ~overrun) == 0)
 513                 tty_insert_flip_char(tty, ch, flag);
 514
 515         /*
 516          * Overrun is special.  Since it's reported immediately,
 517          * it doesn't affect the current character.
 518          */
 519         if (status & ~port->ignore_status_mask & overrun)
 520                 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
 521 }
 522
 523 /*
 524  *      UART_ENABLE_MS - determine if port should enable modem status irqs
 525  */
 526 #define UART_ENABLE_MS(port,cflag)      ((port)->flags & UPF_HARDPPS_CD || \
 527                                          (cflag) & CRTSCTS || \
 528                                          !((cflag) & CLOCAL))
 529
 530 #endif
 531
 532 #endif /* LINUX_SERIAL_CORE_H */