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 #include <linux/serial.h>
  24
  25 /*
  26  * The type definitions.  These are from Ted Ts'o's serial.h
  27  */
  28 #define PORT_UNKNOWN    0
  29 #define PORT_8250       1
  30 #define PORT_16450      2
  31 #define PORT_16550      3
  32 #define PORT_16550A     4
  33 #define PORT_CIRRUS     5
  34 #define PORT_16650      6
  35 #define PORT_16650V2    7
  36 #define PORT_16750      8
  37 #define PORT_STARTECH   9
  38 #define PORT_16C950     10
  39 #define PORT_16654      11
  40 #define PORT_16850      12
  41 #define PORT_RSA        13
  42 #define PORT_NS16550A   14
  43 #define PORT_XSCALE     15
  44 #define PORT_RM9000     16      /* PMC-Sierra RM9xxx internal UART */
  45 #define PORT_OCTEON     17      /* Cavium OCTEON internal UART */
  46 #define PORT_AR7        18      /* Texas Instruments AR7 internal UART */
  47 #define PORT_U6_16550A  19      /* ST-Ericsson U6xxx internal UART */
  48 #define PORT_TEGRA      20      /* NVIDIA Tegra internal UART */
  49 #define PORT_XR17D15X   21      /* Exar XR17D15x UART */
  50 #define PORT_LPC3220    22      /* NXP LPC32xx SoC "Standard" UART */
  51 #define PORT_8250_CIR   23      /* CIR infrared port, has its own driver */
  52 #define PORT_MAX_8250   23      /* max port ID */
  53
  54 /*
  55  * ARM specific type numbers.  These are not currently guaranteed
  56  * to be implemented, and will change in the future.  These are
  57  * separate so any additions to the old serial.c that occur before
  58  * we are merged can be easily merged here.
  59  */
  60 #define PORT_PXA        31
  61 #define PORT_AMBA       32
  62 #define PORT_CLPS711X   33
  63 #define PORT_SA1100     34
  64 #define PORT_UART00     35
  65 #define PORT_21285      37
  66
  67 /* Sparc type numbers.  */
  68 #define PORT_SUNZILOG   38
  69 #define PORT_SUNSAB     39
  70
  71 /* DEC */
  72 #define PORT_DZ         46
  73 #define PORT_ZS         47
  74
  75 /* Parisc type numbers. */
  76 #define PORT_MUX        48
  77
  78 /* Atmel AT91 / AT32 SoC */
  79 #define PORT_ATMEL      49
  80
  81 /* Macintosh Zilog type numbers */
  82 #define PORT_MAC_ZILOG  50      /* m68k : not yet implemented */
  83 #define PORT_PMAC_ZILOG 51
  84
  85 /* SH-SCI */
  86 #define PORT_SCI        52
  87 #define PORT_SCIF       53
  88 #define PORT_IRDA       54
  89
  90 /* Samsung S3C2410 SoC and derivatives thereof */
  91 #define PORT_S3C2410    55
  92
  93 /* SGI IP22 aka Indy / Challenge S / Indigo 2 */
  94 #define PORT_IP22ZILOG  56
  95
  96 /* Sharp LH7a40x -- an ARM9 SoC series */
  97 #define PORT_LH7A40X    57
  98
  99 /* PPC CPM type number */
 100 #define PORT_CPM        58
 101
 102 /* MPC52xx (and MPC512x) type numbers */
 103 #define PORT_MPC52xx    59
 104
 105 /* IBM icom */
 106 #define PORT_ICOM       60
 107
 108 /* Samsung S3C2440 SoC */
 109 #define PORT_S3C2440    61
 110
 111 /* Motorola i.MX SoC */
 112 #define PORT_IMX        62
 113
 114 /* Marvell MPSC */
 115 #define PORT_MPSC       63
 116
 117 /* TXX9 type number */
 118 #define PORT_TXX9       64
 119
 120 /* NEC VR4100 series SIU/DSIU */
 121 #define PORT_VR41XX_SIU         65
 122 #define PORT_VR41XX_DSIU        66
 123
 124 /* Samsung S3C2400 SoC */
 125 #define PORT_S3C2400    67
 126
 127 /* M32R SIO */
 128 #define PORT_M32R_SIO   68
 129
 130 /*Digi jsm */
 131 #define PORT_JSM        69
 132
 133 #define PORT_PNX8XXX    70
 134
 135 /* Hilscher netx */
 136 #define PORT_NETX       71
 137
 138 /* SUN4V Hypervisor Console */
 139 #define PORT_SUNHV      72
 140
 141 #define PORT_S3C2412    73
 142
 143 /* Xilinx uartlite */
 144 #define PORT_UARTLITE   74
 145
 146 /* Blackfin bf5xx */
 147 #define PORT_BFIN       75
 148
 149 /* Micrel KS8695 */
 150 #define PORT_KS8695     76
 151
 152 /* Broadcom SB1250, etc. SOC */
 153 #define PORT_SB1250_DUART       77
 154
 155 /* Freescale ColdFire */
 156 #define PORT_MCF        78
 157
 158 /* Blackfin SPORT */
 159 #define PORT_BFIN_SPORT         79
 160
 161 /* MN10300 on-chip UART numbers */
 162 #define PORT_MN10300            80
 163 #define PORT_MN10300_CTS        81
 164
 165 #define PORT_SC26XX     82
 166
 167 /* SH-SCI */
 168 #define PORT_SCIFA      83
 169
 170 #define PORT_S3C6400    84
 171
 172 /* NWPSERIAL */
 173 #define PORT_NWPSERIAL  85
 174
 175 /* MAX3100 */
 176 #define PORT_MAX3100    86
 177
 178 /* Timberdale UART */
 179 #define PORT_TIMBUART   87
 180
 181 /* Qualcomm MSM SoCs */
 182 #define PORT_MSM        88
 183
 184 /* BCM63xx family SoCs */
 185 #define PORT_BCM63XX    89
 186
 187 /* Aeroflex Gaisler GRLIB APBUART */
 188 #define PORT_APBUART    90
 189
 190 /* Altera UARTs */
 191 #define PORT_ALTERA_JTAGUART    91
 192 #define PORT_ALTERA_UART        92
 193
 194 /* SH-SCI */
 195 #define PORT_SCIFB      93
 196
 197 /* MAX310X */
 198 #define PORT_MAX310X    94
 199
 200 /* High Speed UART for Medfield */
 201 #define PORT_MFD        95
 202
 203 /* TI OMAP-UART */
 204 #define PORT_OMAP       96
 205
 206 /* VIA VT8500 SoC */
 207 #define PORT_VT8500     97
 208
 209 /* Xilinx PSS UART */
 210 #define PORT_XUARTPS    98
 211
 212 /* Atheros AR933X SoC */
 213 #define PORT_AR933X     99
 214
 215 /* Energy Micro efm32 SoC */
 216 #define PORT_EFMUART   100
 217
 218 #ifdef __KERNEL__
 219
 220 #include <linux/compiler.h>
 221 #include <linux/interrupt.h>
 222 #include <linux/circ_buf.h>
 223 #include <linux/spinlock.h>
 224 #include <linux/sched.h>
 225 #include <linux/tty.h>
 226 #include <linux/mutex.h>
 227 #include <linux/sysrq.h>
 228 #include <linux/pps_kernel.h>
 229
 230 struct uart_port;
 231 struct serial_struct;
 232 struct device;
 233
 234 /*
 235  * This structure describes all the operations that can be
 236  * done on the physical hardware.
 237  */
 238 struct uart_ops {
 239         unsigned int    (*tx_empty)(struct uart_port *);
 240         void            (*set_mctrl)(struct uart_port *, unsigned int mctrl);
 241         unsigned int    (*get_mctrl)(struct uart_port *);
 242         void            (*stop_tx)(struct uart_port *);
 243         void            (*start_tx)(struct uart_port *);
 244         void            (*send_xchar)(struct uart_port *, char ch);
 245         void            (*stop_rx)(struct uart_port *);
 246         void            (*enable_ms)(struct uart_port *);
 247         void            (*break_ctl)(struct uart_port *, int ctl);
 248         int             (*startup)(struct uart_port *);
 249         void            (*shutdown)(struct uart_port *);
 250         void            (*flush_buffer)(struct uart_port *);
 251         void            (*set_termios)(struct uart_port *, struct ktermios *new,
 252                                        struct ktermios *old);
 253         void            (*set_ldisc)(struct uart_port *, int new);
 254         void            (*pm)(struct uart_port *, unsigned int state,
 255                               unsigned int oldstate);
 256         int             (*set_wake)(struct uart_port *, unsigned int state);
 257
 258         /*
 259          * Return a string describing the type of the port
 260          */
 261         const char *(*type)(struct uart_port *);
 262
 263         /*
 264          * Release IO and memory resources used by the port.
 265          * This includes iounmap if necessary.
 266          */
 267         void            (*release_port)(struct uart_port *);
 268
 269         /*
 270          * Request IO and memory resources used by the port.
 271          * This includes iomapping the port if necessary.
 272          */
 273         int             (*request_port)(struct uart_port *);
 274         void            (*config_port)(struct uart_port *, int);
 275         int             (*verify_port)(struct uart_port *, struct serial_struct *);
 276         int             (*ioctl)(struct uart_port *, unsigned int, unsigned long);
 277 #ifdef CONFIG_CONSOLE_POLL
 278         int             (*poll_init)(struct uart_port *);
 279         void    (*poll_put_char)(struct uart_port *, unsigned char);
 280         int             (*poll_get_char)(struct uart_port *);
 281 #endif
 282 };
 283
 284 #define NO_POLL_CHAR            0x00ff0000
 285 #define UART_CONFIG_TYPE        (1 << 0)
 286 #define UART_CONFIG_IRQ         (1 << 1)
 287
 288 struct uart_icount {
 289         __u32   cts;
 290         __u32   dsr;
 291         __u32   rng;
 292         __u32   dcd;
 293         __u32   rx;
 294         __u32   tx;
 295         __u32   frame;
 296         __u32   overrun;
 297         __u32   parity;
 298         __u32   brk;
 299         __u32   buf_overrun;
 300 };
 301
 302 typedef unsigned int __bitwise__ upf_t;
 303
 304 struct uart_port {
 305         spinlock_t              lock;                   /* port lock */
 306         unsigned long           iobase;                 /* in/out[bwl] */
 307         unsigned char __iomem   *membase;               /* read/write[bwl] */
 308         unsigned int            (*serial_in)(struct uart_port *, int);
 309         void                    (*serial_out)(struct uart_port *, int, int);
 310         void                    (*set_termios)(struct uart_port *,
 311                                                struct ktermios *new,
 312                                                struct ktermios *old);
 313         int                     (*handle_irq)(struct uart_port *);
 314         void                    (*pm)(struct uart_port *, unsigned int state,
 315                                       unsigned int old);
 316         void                    (*handle_break)(struct uart_port *);
 317         unsigned int            irq;                    /* irq number */
 318         unsigned long           irqflags;               /* irq flags  */
 319         unsigned int            uartclk;                /* base uart clock */
 320         unsigned int            fifosize;               /* tx fifo size */
 321         unsigned char           x_char;                 /* xon/xoff char */
 322         unsigned char           regshift;               /* reg offset shift */
 323         unsigned char           iotype;                 /* io access style */
 324         unsigned char           unused1;
 325
 326 #define UPIO_PORT               (0)
 327 #define UPIO_HUB6               (1)
 328 #define UPIO_MEM                (2)
 329 #define UPIO_MEM32              (3)
 330 #define UPIO_AU                 (4)                     /* Au1x00 type IO */
 331 #define UPIO_TSI                (5)                     /* Tsi108/109 type IO */
 332 #define UPIO_RM9000             (6)                     /* RM9000 type IO */
 333
 334         unsigned int            read_status_mask;       /* driver specific */
 335         unsigned int            ignore_status_mask;     /* driver specific */
 336         struct uart_state       *state;                 /* pointer to parent state */
 337         struct uart_icount      icount;                 /* statistics */
 338
 339         struct console          *cons;                  /* struct console, if any */
 340 #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(SUPPORT_SYSRQ)
 341         unsigned long           sysrq;                  /* sysrq timeout */
 342 #endif
 343
 344         upf_t                   flags;
 345
 346 #define UPF_FOURPORT            ((__force upf_t) (1 << 1))
 347 #define UPF_SAK                 ((__force upf_t) (1 << 2))
 348 #define UPF_SPD_MASK            ((__force upf_t) (0x1030))
 349 #define UPF_SPD_HI              ((__force upf_t) (0x0010))
 350 #define UPF_SPD_VHI             ((__force upf_t) (0x0020))
 351 #define UPF_SPD_CUST            ((__force upf_t) (0x0030))
 352 #define UPF_SPD_SHI             ((__force upf_t) (0x1000))
 353 #define UPF_SPD_WARP            ((__force upf_t) (0x1010))
 354 #define UPF_SKIP_TEST           ((__force upf_t) (1 << 6))
 355 #define UPF_AUTO_IRQ            ((__force upf_t) (1 << 7))
 356 #define UPF_HARDPPS_CD          ((__force upf_t) (1 << 11))
 357 #define UPF_LOW_LATENCY         ((__force upf_t) (1 << 13))
 358 #define UPF_BUGGY_UART          ((__force upf_t) (1 << 14))
 359 #define UPF_NO_TXEN_TEST        ((__force upf_t) (1 << 15))
 360 #define UPF_MAGIC_MULTIPLIER    ((__force upf_t) (1 << 16))
 361 #define UPF_CONS_FLOW           ((__force upf_t) (1 << 23))
 362 #define UPF_SHARE_IRQ           ((__force upf_t) (1 << 24))
 363 #define UPF_EXAR_EFR            ((__force upf_t) (1 << 25))
 364 #define UPF_BUG_THRE            ((__force upf_t) (1 << 26))
 365 /* The exact UART type is known and should not be probed.  */
 366 #define UPF_FIXED_TYPE          ((__force upf_t) (1 << 27))
 367 #define UPF_BOOT_AUTOCONF       ((__force upf_t) (1 << 28))
 368 #define UPF_FIXED_PORT          ((__force upf_t) (1 << 29))
 369 #define UPF_DEAD                ((__force upf_t) (1 << 30))
 370 #define UPF_IOREMAP             ((__force upf_t) (1 << 31))
 371
 372 #define UPF_CHANGE_MASK         ((__force upf_t) (0x17fff))
 373 #define UPF_USR_MASK            ((__force upf_t) (UPF_SPD_MASK|UPF_LOW_LATENCY))
 374
 375         unsigned int            mctrl;                  /* current modem ctrl settings */
 376         unsigned int            timeout;                /* character-based timeout */
 377         unsigned int            type;                   /* port type */
 378         const struct uart_ops   *ops;
 379         unsigned int            custom_divisor;
 380         unsigned int            line;                   /* port index */
 381         resource_size_t         mapbase;                /* for ioremap */
 382         struct device           *dev;                   /* parent device */
 383         unsigned char           hub6;                   /* this should be in the 8250 driver */
 384         unsigned char           suspended;
 385         unsigned char           irq_wake;
 386         unsigned char           unused[2];
 387         void                    *private_data;          /* generic platform data pointer */
 388 };
 389
 390 static inline int serial_port_in(struct uart_port *up, int offset)
 391 {
 392         return up->serial_in(up, offset);
 393 }
 394
 395 static inline void serial_port_out(struct uart_port *up, int offset, int value)
 396 {
 397         up->serial_out(up, offset, value);
 398 }
 399
 400 /*
 401  * This is the state information which is persistent across opens.
 402  */
 403 struct uart_state {
 404         struct tty_port         port;
 405
 406         int                     pm_state;
 407         struct circ_buf         xmit;
 408
 409         struct uart_port        *uart_port;
 410 };
 411
 412 #define UART_XMIT_SIZE  PAGE_SIZE
 413
 414
 415 /* number of characters left in xmit buffer before we ask for more */
 416 #define WAKEUP_CHARS            256
 417
 418 struct module;
 419 struct tty_driver;
 420
 421 struct uart_driver {
 422         struct module           *owner;
 423         const char              *driver_name;
 424         const char              *dev_name;
 425         int                      major;
 426         int                      minor;
 427         int                      nr;
 428         struct console          *cons;
 429
 430         /*
 431          * these are private; the low level driver should not
 432          * touch these; they should be initialised to NULL
 433          */
 434         struct uart_state       *state;
 435         struct tty_driver       *tty_driver;
 436 };
 437
 438 void uart_write_wakeup(struct uart_port *port);
 439
 440 /*
 441  * Baud rate helpers.
 442  */
 443 void uart_update_timeout(struct uart_port *port, unsigned int cflag,
 444                          unsigned int baud);
 445 unsigned int uart_get_baud_rate(struct uart_port *port, struct ktermios *termios,
 446                                 struct ktermios *old, unsigned int min,
 447                                 unsigned int max);
 448 unsigned int uart_get_divisor(struct uart_port *port, unsigned int baud);
 449
 450 /* Base timer interval for polling */
 451 static inline int uart_poll_timeout(struct uart_port *port)
 452 {
 453         int timeout = port->timeout;
 454
 455         return timeout > 6 ? (timeout / 2 - 2) : 1;
 456 }
 457
 458 /*
 459  * Console helpers.
 460  */
 461 struct uart_port *uart_get_console(struct uart_port *ports, int nr,
 462                                    struct console *c);
 463 void uart_parse_options(char *options, int *baud, int *parity, int *bits,
 464                         int *flow);
 465 int uart_set_options(struct uart_port *port, struct console *co, int baud,
 466                      int parity, int bits, int flow);
 467 struct tty_driver *uart_console_device(struct console *co, int *index);
 468 void uart_console_write(struct uart_port *port, const char *s,
 469                         unsigned int count,
 470                         void (*putchar)(struct uart_port *, int));
 471
 472 /*
 473  * Port/driver registration/removal
 474  */
 475 int uart_register_driver(struct uart_driver *uart);
 476 void uart_unregister_driver(struct uart_driver *uart);
 477 int uart_add_one_port(struct uart_driver *reg, struct uart_port *port);
 478 int uart_remove_one_port(struct uart_driver *reg, struct uart_port *port);
 479 int uart_match_port(struct uart_port *port1, struct uart_port *port2);
 480
 481 /*
 482  * Power Management
 483  */
 484 int uart_suspend_port(struct uart_driver *reg, struct uart_port *port);
 485 int uart_resume_port(struct uart_driver *reg, struct uart_port *port);
 486
 487 #define uart_circ_empty(circ)           ((circ)->head == (circ)->tail)
 488 #define uart_circ_clear(circ)           ((circ)->head = (circ)->tail = 0)
 489
 490 #define uart_circ_chars_pending(circ)   \
 491         (CIRC_CNT((circ)->head, (circ)->tail, UART_XMIT_SIZE))
 492
 493 #define uart_circ_chars_free(circ)      \
 494         (CIRC_SPACE((circ)->head, (circ)->tail, UART_XMIT_SIZE))
 495
 496 static inline int uart_tx_stopped(struct uart_port *port)
 497 {
 498         struct tty_struct *tty = port->state->port.tty;
 499         if(tty->stopped || tty->hw_stopped)
 500                 return 1;
 501         return 0;
 502 }
 503
 504 /*
 505  * The following are helper functions for the low level drivers.
 506  */
 507
 508 extern void uart_handle_dcd_change(struct uart_port *uport,
 509                 unsigned int status);
 510 extern void uart_handle_cts_change(struct uart_port *uport,
 511                 unsigned int status);
 512
 513 extern void uart_insert_char(struct uart_port *port, unsigned int status,
 514                  unsigned int overrun, unsigned int ch, unsigned int flag);
 515
 516 #ifdef SUPPORT_SYSRQ
 517 static inline int
 518 uart_handle_sysrq_char(struct uart_port *port, unsigned int ch)
 519 {
 520         if (port->sysrq) {
 521                 if (ch && time_before(jiffies, port->sysrq)) {
 522                         handle_sysrq(ch);
 523                         port->sysrq = 0;
 524                         return 1;
 525                 }
 526                 port->sysrq = 0;
 527         }
 528         return 0;
 529 }
 530 #else
 531 #define uart_handle_sysrq_char(port,ch) ({ (void)port; 0; })
 532 #endif
 533
 534 /*
 535  * We do the SysRQ and SAK checking like this...
 536  */
 537 static inline int uart_handle_break(struct uart_port *port)
 538 {
 539         struct uart_state *state = port->state;
 540
 541         if (port->handle_break)
 542                 port->handle_break(port);
 543
 544 #ifdef SUPPORT_SYSRQ
 545         if (port->cons && port->cons->index == port->line) {
 546                 if (!port->sysrq) {
 547                         port->sysrq = jiffies + HZ*5;
 548                         return 1;
 549                 }
 550                 port->sysrq = 0;
 551         }
 552 #endif
 553         if (port->flags & UPF_SAK)
 554                 do_SAK(state->port.tty);
 555         return 0;
 556 }
 557
 558 /*
 559  *      UART_ENABLE_MS - determine if port should enable modem status irqs
 560  */
 561 #define UART_ENABLE_MS(port,cflag)      ((port)->flags & UPF_HARDPPS_CD || \
 562                                          (cflag) & CRTSCTS || \
 563                                          !((cflag) & CLOCAL))
 564
 565 #endif
 566
 567 #endif /* LINUX_SERIAL_CORE_H */