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 AT91RM9200 SoC */
  71 #define PORT_AT91RM9200 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 #ifdef __KERNEL__
 134
 135 #include <linux/config.h>
 136 #include <linux/compiler.h>
 137 #include <linux/interrupt.h>
 138 #include <linux/circ_buf.h>
 139 #include <linux/spinlock.h>
 140 #include <linux/sched.h>
 141 #include <linux/tty.h>
 142 #include <linux/mutex.h>
 143
 144 struct uart_port;
 145 struct uart_info;
 146 struct serial_struct;
 147 struct device;
 148
 149 /*
 150  * This structure describes all the operations that can be
 151  * done on the physical hardware.
 152  */
 153 struct uart_ops {
 154         unsigned int    (*tx_empty)(struct uart_port *);
 155         void            (*set_mctrl)(struct uart_port *, unsigned int mctrl);
 156         unsigned int    (*get_mctrl)(struct uart_port *);
 157         void            (*stop_tx)(struct uart_port *);
 158         void            (*start_tx)(struct uart_port *);
 159         void            (*send_xchar)(struct uart_port *, char ch);
 160         void            (*stop_rx)(struct uart_port *);
 161         void            (*enable_ms)(struct uart_port *);
 162         void            (*break_ctl)(struct uart_port *, int ctl);
 163         int             (*startup)(struct uart_port *);
 164         void            (*shutdown)(struct uart_port *);
 165         void            (*set_termios)(struct uart_port *, struct termios *new,
 166                                        struct termios *old);
 167         void            (*pm)(struct uart_port *, unsigned int state,
 168                               unsigned int oldstate);
 169         int             (*set_wake)(struct uart_port *, unsigned int state);
 170
 171         /*
 172          * Return a string describing the type of the port
 173          */
 174         const char *(*type)(struct uart_port *);
 175
 176         /*
 177          * Release IO and memory resources used by the port.
 178          * This includes iounmap if necessary.
 179          */
 180         void            (*release_port)(struct uart_port *);
 181
 182         /*
 183          * Request IO and memory resources used by the port.
 184          * This includes iomapping the port if necessary.
 185          */
 186         int             (*request_port)(struct uart_port *);
 187         void            (*config_port)(struct uart_port *, int);
 188         int             (*verify_port)(struct uart_port *, struct serial_struct *);
 189         int             (*ioctl)(struct uart_port *, unsigned int, unsigned long);
 190 };
 191
 192 #define UART_CONFIG_TYPE        (1 << 0)
 193 #define UART_CONFIG_IRQ         (1 << 1)
 194
 195 struct uart_icount {
 196         __u32   cts;
 197         __u32   dsr;
 198         __u32   rng;
 199         __u32   dcd;
 200         __u32   rx;
 201         __u32   tx;
 202         __u32   frame;
 203         __u32   overrun;
 204         __u32   parity;
 205         __u32   brk;
 206         __u32   buf_overrun;
 207 };
 208
 209 typedef unsigned int __bitwise__ upf_t;
 210
 211 struct uart_port {
 212         spinlock_t              lock;                   /* port lock */
 213         unsigned int            iobase;                 /* in/out[bwl] */
 214         unsigned char __iomem   *membase;               /* read/write[bwl] */
 215         unsigned int            irq;                    /* irq number */
 216         unsigned int            uartclk;                /* base uart clock */
 217         unsigned char           fifosize;               /* tx fifo size */
 218         unsigned char           x_char;                 /* xon/xoff char */
 219         unsigned char           regshift;               /* reg offset shift */
 220         unsigned char           iotype;                 /* io access style */
 221
 222 #define UPIO_PORT               (0)
 223 #define UPIO_HUB6               (1)
 224 #define UPIO_MEM                (2)
 225 #define UPIO_MEM32              (3)
 226 #define UPIO_AU                 (4)                     /* Au1x00 type IO */
 227
 228         unsigned int            read_status_mask;       /* driver specific */
 229         unsigned int            ignore_status_mask;     /* driver specific */
 230         struct uart_info        *info;                  /* pointer to parent info */
 231         struct uart_icount      icount;                 /* statistics */
 232
 233         struct console          *cons;                  /* struct console, if any */
 234 #ifdef CONFIG_SERIAL_CORE_CONSOLE
 235         unsigned long           sysrq;                  /* sysrq timeout */
 236 #endif
 237
 238         upf_t                   flags;
 239
 240 #define UPF_FOURPORT            ((__force upf_t) (1 << 1))
 241 #define UPF_SAK                 ((__force upf_t) (1 << 2))
 242 #define UPF_SPD_MASK            ((__force upf_t) (0x1030))
 243 #define UPF_SPD_HI              ((__force upf_t) (0x0010))
 244 #define UPF_SPD_VHI             ((__force upf_t) (0x0020))
 245 #define UPF_SPD_CUST            ((__force upf_t) (0x0030))
 246 #define UPF_SPD_SHI             ((__force upf_t) (0x1000))
 247 #define UPF_SPD_WARP            ((__force upf_t) (0x1010))
 248 #define UPF_SKIP_TEST           ((__force upf_t) (1 << 6))
 249 #define UPF_AUTO_IRQ            ((__force upf_t) (1 << 7))
 250 #define UPF_HARDPPS_CD          ((__force upf_t) (1 << 11))
 251 #define UPF_LOW_LATENCY         ((__force upf_t) (1 << 13))
 252 #define UPF_BUGGY_UART          ((__force upf_t) (1 << 14))
 253 #define UPF_MAGIC_MULTIPLIER    ((__force upf_t) (1 << 16))
 254 #define UPF_CONS_FLOW           ((__force upf_t) (1 << 23))
 255 #define UPF_SHARE_IRQ           ((__force upf_t) (1 << 24))
 256 #define UPF_BOOT_AUTOCONF       ((__force upf_t) (1 << 28))
 257 #define UPF_IOREMAP             ((__force upf_t) (1 << 31))
 258
 259 #define UPF_CHANGE_MASK         ((__force upf_t) (0x17fff))
 260 #define UPF_USR_MASK            ((__force upf_t) (UPF_SPD_MASK|UPF_LOW_LATENCY))
 261
 262         unsigned int            mctrl;                  /* current modem ctrl settings */
 263         unsigned int            timeout;                /* character-based timeout */
 264         unsigned int            type;                   /* port type */
 265         const struct uart_ops   *ops;
 266         unsigned int            custom_divisor;
 267         unsigned int            line;                   /* port index */
 268         unsigned long           mapbase;                /* for ioremap */
 269         struct device           *dev;                   /* parent device */
 270         unsigned char           hub6;                   /* this should be in the 8250 driver */
 271         unsigned char           unused[3];
 272 };
 273
 274 /*
 275  * This is the state information which is persistent across opens.
 276  * The low level driver must not to touch any elements contained
 277  * within.
 278  */
 279 struct uart_state {
 280         unsigned int            close_delay;            /* msec */
 281         unsigned int            closing_wait;           /* msec */
 282
 283 #define USF_CLOSING_WAIT_INF    (0)
 284 #define USF_CLOSING_WAIT_NONE   (~0U)
 285
 286         int                     count;
 287         int                     pm_state;
 288         struct uart_info        *info;
 289         struct uart_port        *port;
 290
 291         struct mutex            mutex;
 292 };
 293
 294 #define UART_XMIT_SIZE  PAGE_SIZE
 295
 296 typedef unsigned int __bitwise__ uif_t;
 297
 298 /*
 299  * This is the state information which is only valid when the port
 300  * is open; it may be freed by the core driver once the device has
 301  * been closed.  Either the low level driver or the core can modify
 302  * stuff here.
 303  */
 304 struct uart_info {
 305         struct tty_struct       *tty;
 306         struct circ_buf         xmit;
 307         uif_t                   flags;
 308
 309 /*
 310  * Definitions for info->flags.  These are _private_ to serial_core, and
 311  * are specific to this structure.  They may be queried by low level drivers.
 312  */
 313 #define UIF_CHECK_CD            ((__force uif_t) (1 << 25))
 314 #define UIF_CTS_FLOW            ((__force uif_t) (1 << 26))
 315 #define UIF_NORMAL_ACTIVE       ((__force uif_t) (1 << 29))
 316 #define UIF_INITIALIZED         ((__force uif_t) (1 << 31))
 317
 318         int                     blocked_open;
 319
 320         struct tasklet_struct   tlet;
 321
 322         wait_queue_head_t       open_wait;
 323         wait_queue_head_t       delta_msr_wait;
 324 };
 325
 326 /* number of characters left in xmit buffer before we ask for more */
 327 #define WAKEUP_CHARS            256
 328
 329 struct module;
 330 struct tty_driver;
 331
 332 struct uart_driver {
 333         struct module           *owner;
 334         const char              *driver_name;
 335         const char              *dev_name;
 336         const char              *devfs_name;
 337         int                      major;
 338         int                      minor;
 339         int                      nr;
 340         struct console          *cons;
 341
 342         /*
 343          * these are private; the low level driver should not
 344          * touch these; they should be initialised to NULL
 345          */
 346         struct uart_state       *state;
 347         struct tty_driver       *tty_driver;
 348 };
 349
 350 void uart_write_wakeup(struct uart_port *port);
 351
 352 /*
 353  * Baud rate helpers.
 354  */
 355 void uart_update_timeout(struct uart_port *port, unsigned int cflag,
 356                          unsigned int baud);
 357 unsigned int uart_get_baud_rate(struct uart_port *port, struct termios *termios,
 358                                 struct termios *old, unsigned int min,
 359                                 unsigned int max);
 360 unsigned int uart_get_divisor(struct uart_port *port, unsigned int baud);
 361
 362 /*
 363  * Console helpers.
 364  */
 365 struct uart_port *uart_get_console(struct uart_port *ports, int nr,
 366                                    struct console *c);
 367 void uart_parse_options(char *options, int *baud, int *parity, int *bits,
 368                         int *flow);
 369 int uart_set_options(struct uart_port *port, struct console *co, int baud,
 370                      int parity, int bits, int flow);
 371 struct tty_driver *uart_console_device(struct console *co, int *index);
 372 void uart_console_write(struct uart_port *port, const char *s,
 373                         unsigned int count,
 374                         void (*putchar)(struct uart_port *, int));
 375
 376 /*
 377  * Port/driver registration/removal
 378  */
 379 int uart_register_driver(struct uart_driver *uart);
 380 void uart_unregister_driver(struct uart_driver *uart);
 381 int uart_add_one_port(struct uart_driver *reg, struct uart_port *port);
 382 int uart_remove_one_port(struct uart_driver *reg, struct uart_port *port);
 383 int uart_match_port(struct uart_port *port1, struct uart_port *port2);
 384
 385 /*
 386  * Power Management
 387  */
 388 int uart_suspend_port(struct uart_driver *reg, struct uart_port *port);
 389 int uart_resume_port(struct uart_driver *reg, struct uart_port *port);
 390
 391 #define uart_circ_empty(circ)           ((circ)->head == (circ)->tail)
 392 #define uart_circ_clear(circ)           ((circ)->head = (circ)->tail = 0)
 393
 394 #define uart_circ_chars_pending(circ)   \
 395         (CIRC_CNT((circ)->head, (circ)->tail, UART_XMIT_SIZE))
 396
 397 #define uart_circ_chars_free(circ)      \
 398         (CIRC_SPACE((circ)->head, (circ)->tail, UART_XMIT_SIZE))
 399
 400 #define uart_tx_stopped(port)           \
 401         ((port)->info->tty->stopped || (port)->info->tty->hw_stopped)
 402
 403 /*
 404  * The following are helper functions for the low level drivers.
 405  */
 406 static inline int
 407 uart_handle_sysrq_char(struct uart_port *port, unsigned int ch,
 408                        struct pt_regs *regs)
 409 {
 410 #ifdef SUPPORT_SYSRQ
 411         if (port->sysrq) {
 412                 if (ch && time_before(jiffies, port->sysrq)) {
 413                         handle_sysrq(ch, regs, NULL);
 414                         port->sysrq = 0;
 415                         return 1;
 416                 }
 417                 port->sysrq = 0;
 418         }
 419 #endif
 420         return 0;
 421 }
 422 #ifndef SUPPORT_SYSRQ
 423 #define uart_handle_sysrq_char(port,ch,regs) uart_handle_sysrq_char(port, 0, NULL)
 424 #endif
 425
 426 /*
 427  * We do the SysRQ and SAK checking like this...
 428  */
 429 static inline int uart_handle_break(struct uart_port *port)
 430 {
 431         struct uart_info *info = port->info;
 432 #ifdef SUPPORT_SYSRQ
 433         if (port->cons && port->cons->index == port->line) {
 434                 if (!port->sysrq) {
 435                         port->sysrq = jiffies + HZ*5;
 436                         return 1;
 437                 }
 438                 port->sysrq = 0;
 439         }
 440 #endif
 441         if (port->flags & UPF_SAK)
 442                 do_SAK(info->tty);
 443         return 0;
 444 }
 445
 446 /**
 447  *      uart_handle_dcd_change - handle a change of carrier detect state
 448  *      @port: uart_port structure for the open port
 449  *      @status: new carrier detect status, nonzero if active
 450  */
 451 static inline void
 452 uart_handle_dcd_change(struct uart_port *port, unsigned int status)
 453 {
 454         struct uart_info *info = port->info;
 455
 456         port->icount.dcd++;
 457
 458 #ifdef CONFIG_HARD_PPS
 459         if ((port->flags & UPF_HARDPPS_CD) && status)
 460                 hardpps();
 461 #endif
 462
 463         if (info->flags & UIF_CHECK_CD) {
 464                 if (status)
 465                         wake_up_interruptible(&info->open_wait);
 466                 else if (info->tty)
 467                         tty_hangup(info->tty);
 468         }
 469 }
 470
 471 /**
 472  *      uart_handle_cts_change - handle a change of clear-to-send state
 473  *      @port: uart_port structure for the open port
 474  *      @status: new clear to send status, nonzero if active
 475  */
 476 static inline void
 477 uart_handle_cts_change(struct uart_port *port, unsigned int status)
 478 {
 479         struct uart_info *info = port->info;
 480         struct tty_struct *tty = info->tty;
 481
 482         port->icount.cts++;
 483
 484         if (info->flags & UIF_CTS_FLOW) {
 485                 if (tty->hw_stopped) {
 486                         if (status) {
 487                                 tty->hw_stopped = 0;
 488                                 port->ops->start_tx(port);
 489                                 uart_write_wakeup(port);
 490                         }
 491                 } else {
 492                         if (!status) {
 493                                 tty->hw_stopped = 1;
 494                                 port->ops->stop_tx(port);
 495                         }
 496                 }
 497         }
 498 }
 499
 500 #include <linux/tty_flip.h>
 501
 502 static inline void
 503 uart_insert_char(struct uart_port *port, unsigned int status,
 504                  unsigned int overrun, unsigned int ch, unsigned int flag)
 505 {
 506         struct tty_struct *tty = port->info->tty;
 507
 508         if ((status & port->ignore_status_mask & ~overrun) == 0)
 509                 tty_insert_flip_char(tty, ch, flag);
 510
 511         /*
 512          * Overrun is special.  Since it's reported immediately,
 513          * it doesn't affect the current character.
 514          */
 515         if (status & ~port->ignore_status_mask & overrun)
 516                 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
 517 }
 518
 519 /*
 520  *      UART_ENABLE_MS - determine if port should enable modem status irqs
 521  */
 522 #define UART_ENABLE_MS(port,cflag)      ((port)->flags & UPF_HARDPPS_CD || \
 523                                          (cflag) & CRTSCTS || \
 524                                          !((cflag) & CLOCAL))
 525
 526 #endif
 527
 528 #endif /* LINUX_SERIAL_CORE_H */