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_MAX_8250   22      /* max port ID */
  52
  53 /*
  54  * ARM specific type numbers.  These are not currently guaranteed
  55  * to be implemented, and will change in the future.  These are
  56  * separate so any additions to the old serial.c that occur before
  57  * we are merged can be easily merged here.
  58  */
  59 #define PORT_PXA        31
  60 #define PORT_AMBA       32
  61 #define PORT_CLPS711X   33
  62 #define PORT_SA1100     34
  63 #define PORT_UART00     35
  64 #define PORT_21285      37
  65
  66 /* Sparc type numbers.  */
  67 #define PORT_SUNZILOG   38
  68 #define PORT_SUNSAB     39
  69
  70 /* DEC */
  71 #define PORT_DZ         46
  72 #define PORT_ZS         47
  73
  74 /* Parisc type numbers. */
  75 #define PORT_MUX        48
  76
  77 /* Atmel AT91 / AT32 SoC */
  78 #define PORT_ATMEL      49
  79
  80 /* Macintosh Zilog type numbers */
  81 #define PORT_MAC_ZILOG  50      /* m68k : not yet implemented */
  82 #define PORT_PMAC_ZILOG 51
  83
  84 /* SH-SCI */
  85 #define PORT_SCI        52
  86 #define PORT_SCIF       53
  87 #define PORT_IRDA       54
  88
  89 /* Samsung S3C2410 SoC and derivatives thereof */
  90 #define PORT_S3C2410    55
  91
  92 /* SGI IP22 aka Indy / Challenge S / Indigo 2 */
  93 #define PORT_IP22ZILOG  56
  94
  95 /* Sharp LH7a40x -- an ARM9 SoC series */
  96 #define PORT_LH7A40X    57
  97
  98 /* PPC CPM type number */
  99 #define PORT_CPM        58
 100
 101 /* MPC52xx (and MPC512x) type numbers */
 102 #define PORT_MPC52xx    59
 103
 104 /* IBM icom */
 105 #define PORT_ICOM       60
 106
 107 /* Samsung S3C2440 SoC */
 108 #define PORT_S3C2440    61
 109
 110 /* Motorola i.MX SoC */
 111 #define PORT_IMX        62
 112
 113 /* Marvell MPSC */
 114 #define PORT_MPSC       63
 115
 116 /* TXX9 type number */
 117 #define PORT_TXX9       64
 118
 119 /* NEC VR4100 series SIU/DSIU */
 120 #define PORT_VR41XX_SIU         65
 121 #define PORT_VR41XX_DSIU        66
 122
 123 /* Samsung S3C2400 SoC */
 124 #define PORT_S3C2400    67
 125
 126 /* M32R SIO */
 127 #define PORT_M32R_SIO   68
 128
 129 /*Digi jsm */
 130 #define PORT_JSM        69
 131
 132 #define PORT_PNX8XXX    70
 133
 134 /* Hilscher netx */
 135 #define PORT_NETX       71
 136
 137 /* SUN4V Hypervisor Console */
 138 #define PORT_SUNHV      72
 139
 140 #define PORT_S3C2412    73
 141
 142 /* Xilinx uartlite */
 143 #define PORT_UARTLITE   74
 144
 145 /* Blackfin bf5xx */
 146 #define PORT_BFIN       75
 147
 148 /* Micrel KS8695 */
 149 #define PORT_KS8695     76
 150
 151 /* Broadcom SB1250, etc. SOC */
 152 #define PORT_SB1250_DUART       77
 153
 154 /* Freescale ColdFire */
 155 #define PORT_MCF        78
 156
 157 /* Blackfin SPORT */
 158 #define PORT_BFIN_SPORT         79
 159
 160 /* MN10300 on-chip UART numbers */
 161 #define PORT_MN10300            80
 162 #define PORT_MN10300_CTS        81
 163
 164 #define PORT_SC26XX     82
 165
 166 /* SH-SCI */
 167 #define PORT_SCIFA      83
 168
 169 #define PORT_S3C6400    84
 170
 171 /* NWPSERIAL */
 172 #define PORT_NWPSERIAL  85
 173
 174 /* MAX3100 */
 175 #define PORT_MAX3100    86
 176
 177 /* Timberdale UART */
 178 #define PORT_TIMBUART   87
 179
 180 /* Qualcomm MSM SoCs */
 181 #define PORT_MSM        88
 182
 183 /* BCM63xx family SoCs */
 184 #define PORT_BCM63XX    89
 185
 186 /* Aeroflex Gaisler GRLIB APBUART */
 187 #define PORT_APBUART    90
 188
 189 /* Altera UARTs */
 190 #define PORT_ALTERA_JTAGUART    91
 191 #define PORT_ALTERA_UART        92
 192
 193 /* SH-SCI */
 194 #define PORT_SCIFB      93
 195
 196 /* MAX3107 */
 197 #define PORT_MAX3107    94
 198
 199 /* High Speed UART for Medfield */
 200 #define PORT_MFD        95
 201
 202 /* TI OMAP-UART */
 203 #define PORT_OMAP       96
 204
 205 /* VIA VT8500 SoC */
 206 #define PORT_VT8500     97
 207
 208 /* Xilinx PSS UART */
 209 #define PORT_XUARTPS    98
 210
 211 /* Atheros AR933X SoC */
 212 #define PORT_AR933X     99
 213
 214 /* Energy Micro efm32 SoC */
 215 #define PORT_EFMUART   100
 216
 217 #ifdef __KERNEL__
 218
 219 #include <linux/compiler.h>
 220 #include <linux/interrupt.h>
 221 #include <linux/circ_buf.h>
 222 #include <linux/spinlock.h>
 223 #include <linux/sched.h>
 224 #include <linux/tty.h>
 225 #include <linux/mutex.h>
 226 #include <linux/sysrq.h>
 227 #include <linux/pps_kernel.h>
 228
 229 struct uart_port;
 230 struct serial_struct;
 231 struct device;
 232
 233 /*
 234  * This structure describes all the operations that can be
 235  * done on the physical hardware.
 236  */
 237 struct uart_ops {
 238         unsigned int    (*tx_empty)(struct uart_port *);
 239         void            (*set_mctrl)(struct uart_port *, unsigned int mctrl);
 240         unsigned int    (*get_mctrl)(struct uart_port *);
 241         void            (*stop_tx)(struct uart_port *);
 242         void            (*start_tx)(struct uart_port *);
 243         void            (*send_xchar)(struct uart_port *, char ch);
 244         void            (*stop_rx)(struct uart_port *);
 245         void            (*enable_ms)(struct uart_port *);
 246         void            (*break_ctl)(struct uart_port *, int ctl);
 247         int             (*startup)(struct uart_port *);
 248         void            (*shutdown)(struct uart_port *);
 249         void            (*flush_buffer)(struct uart_port *);
 250         void            (*set_termios)(struct uart_port *, struct ktermios *new,
 251                                        struct ktermios *old);
 252         void            (*set_ldisc)(struct uart_port *, int new);
 253         void            (*pm)(struct uart_port *, unsigned int state,
 254                               unsigned int oldstate);
 255         int             (*set_wake)(struct uart_port *, unsigned int state);
 256
 257         /*
 258          * Return a string describing the type of the port
 259          */
 260         const char *(*type)(struct uart_port *);
 261
 262         /*
 263          * Release IO and memory resources used by the port.
 264          * This includes iounmap if necessary.
 265          */
 266         void            (*release_port)(struct uart_port *);
 267
 268         /*
 269          * Request IO and memory resources used by the port.
 270          * This includes iomapping the port if necessary.
 271          */
 272         int             (*request_port)(struct uart_port *);
 273         void            (*config_port)(struct uart_port *, int);
 274         int             (*verify_port)(struct uart_port *, struct serial_struct *);
 275         int             (*ioctl)(struct uart_port *, unsigned int, unsigned long);
 276 #ifdef CONFIG_CONSOLE_POLL
 277         void    (*poll_put_char)(struct uart_port *, unsigned char);
 278         int             (*poll_get_char)(struct uart_port *);
 279 #endif
 280 };
 281
 282 #define NO_POLL_CHAR            0x00ff0000
 283 #define UART_CONFIG_TYPE        (1 << 0)
 284 #define UART_CONFIG_IRQ         (1 << 1)
 285
 286 struct uart_icount {
 287         __u32   cts;
 288         __u32   dsr;
 289         __u32   rng;
 290         __u32   dcd;
 291         __u32   rx;
 292         __u32   tx;
 293         __u32   frame;
 294         __u32   overrun;
 295         __u32   parity;
 296         __u32   brk;
 297         __u32   buf_overrun;
 298 };
 299
 300 typedef unsigned int __bitwise__ upf_t;
 301
 302 struct uart_port {
 303         spinlock_t              lock;                   /* port lock */
 304         unsigned long           iobase;                 /* in/out[bwl] */
 305         unsigned char __iomem   *membase;               /* read/write[bwl] */
 306         unsigned int            (*serial_in)(struct uart_port *, int);
 307         void                    (*serial_out)(struct uart_port *, int, int);
 308         void                    (*set_termios)(struct uart_port *,
 309                                                struct ktermios *new,
 310                                                struct ktermios *old);
 311         int                     (*handle_irq)(struct uart_port *);
 312         void                    (*pm)(struct uart_port *, unsigned int state,
 313                                       unsigned int old);
 314         void                    (*handle_break)(struct uart_port *);
 315         unsigned int            irq;                    /* irq number */
 316         unsigned long           irqflags;               /* irq flags  */
 317         unsigned int            uartclk;                /* base uart clock */
 318         unsigned int            fifosize;               /* tx fifo size */
 319         unsigned char           x_char;                 /* xon/xoff char */
 320         unsigned char           regshift;               /* reg offset shift */
 321         unsigned char           iotype;                 /* io access style */
 322         unsigned char           unused1;
 323
 324 #define UPIO_PORT               (0)
 325 #define UPIO_HUB6               (1)
 326 #define UPIO_MEM                (2)
 327 #define UPIO_MEM32              (3)
 328 #define UPIO_AU                 (4)                     /* Au1x00 type IO */
 329 #define UPIO_TSI                (5)                     /* Tsi108/109 type IO */
 330 #define UPIO_RM9000             (6)                     /* RM9000 type IO */
 331
 332         unsigned int            read_status_mask;       /* driver specific */
 333         unsigned int            ignore_status_mask;     /* driver specific */
 334         struct uart_state       *state;                 /* pointer to parent state */
 335         struct uart_icount      icount;                 /* statistics */
 336
 337         struct console          *cons;                  /* struct console, if any */
 338 #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(SUPPORT_SYSRQ)
 339         unsigned long           sysrq;                  /* sysrq timeout */
 340 #endif
 341
 342         upf_t                   flags;
 343
 344 #define UPF_FOURPORT            ((__force upf_t) (1 << 1))
 345 #define UPF_SAK                 ((__force upf_t) (1 << 2))
 346 #define UPF_SPD_MASK            ((__force upf_t) (0x1030))
 347 #define UPF_SPD_HI              ((__force upf_t) (0x0010))
 348 #define UPF_SPD_VHI             ((__force upf_t) (0x0020))
 349 #define UPF_SPD_CUST            ((__force upf_t) (0x0030))
 350 #define UPF_SPD_SHI             ((__force upf_t) (0x1000))
 351 #define UPF_SPD_WARP            ((__force upf_t) (0x1010))
 352 #define UPF_SKIP_TEST           ((__force upf_t) (1 << 6))
 353 #define UPF_AUTO_IRQ            ((__force upf_t) (1 << 7))
 354 #define UPF_HARDPPS_CD          ((__force upf_t) (1 << 11))
 355 #define UPF_LOW_LATENCY         ((__force upf_t) (1 << 13))
 356 #define UPF_BUGGY_UART          ((__force upf_t) (1 << 14))
 357 #define UPF_NO_TXEN_TEST        ((__force upf_t) (1 << 15))
 358 #define UPF_MAGIC_MULTIPLIER    ((__force upf_t) (1 << 16))
 359 #define UPF_CONS_FLOW           ((__force upf_t) (1 << 23))
 360 #define UPF_SHARE_IRQ           ((__force upf_t) (1 << 24))
 361 #define UPF_EXAR_EFR            ((__force upf_t) (1 << 25))
 362 #define UPF_BUG_THRE            ((__force upf_t) (1 << 26))
 363 /* The exact UART type is known and should not be probed.  */
 364 #define UPF_FIXED_TYPE          ((__force upf_t) (1 << 27))
 365 #define UPF_BOOT_AUTOCONF       ((__force upf_t) (1 << 28))
 366 #define UPF_FIXED_PORT          ((__force upf_t) (1 << 29))
 367 #define UPF_DEAD                ((__force upf_t) (1 << 30))
 368 #define UPF_IOREMAP             ((__force upf_t) (1 << 31))
 369
 370 #define UPF_CHANGE_MASK         ((__force upf_t) (0x17fff))
 371 #define UPF_USR_MASK            ((__force upf_t) (UPF_SPD_MASK|UPF_LOW_LATENCY))
 372
 373         unsigned int            mctrl;                  /* current modem ctrl settings */
 374         unsigned int            timeout;                /* character-based timeout */
 375         unsigned int            type;                   /* port type */
 376         const struct uart_ops   *ops;
 377         unsigned int            custom_divisor;
 378         unsigned int            line;                   /* port index */
 379         resource_size_t         mapbase;                /* for ioremap */
 380         struct device           *dev;                   /* parent device */
 381         unsigned char           hub6;                   /* this should be in the 8250 driver */
 382         unsigned char           suspended;
 383         unsigned char           irq_wake;
 384         unsigned char           unused[2];
 385         void                    *private_data;          /* generic platform data pointer */
 386 };
 387
 388 static inline int serial_port_in(struct uart_port *up, int offset)
 389 {
 390         return up->serial_in(up, offset);
 391 }
 392
 393 static inline void serial_port_out(struct uart_port *up, int offset, int value)
 394 {
 395         up->serial_out(up, offset, value);
 396 }
 397
 398 /*
 399  * This is the state information which is persistent across opens.
 400  */
 401 struct uart_state {
 402         struct tty_port         port;
 403
 404         int                     pm_state;
 405         struct circ_buf         xmit;
 406
 407         struct uart_port        *uart_port;
 408 };
 409
 410 #define UART_XMIT_SIZE  PAGE_SIZE
 411
 412
 413 /* number of characters left in xmit buffer before we ask for more */
 414 #define WAKEUP_CHARS            256
 415
 416 struct module;
 417 struct tty_driver;
 418
 419 struct uart_driver {
 420         struct module           *owner;
 421         const char              *driver_name;
 422         const char              *dev_name;
 423         int                      major;
 424         int                      minor;
 425         int                      nr;
 426         struct console          *cons;
 427
 428         /*
 429          * these are private; the low level driver should not
 430          * touch these; they should be initialised to NULL
 431          */
 432         struct uart_state       *state;
 433         struct tty_driver       *tty_driver;
 434 };
 435
 436 void uart_write_wakeup(struct uart_port *port);
 437
 438 /*
 439  * Baud rate helpers.
 440  */
 441 void uart_update_timeout(struct uart_port *port, unsigned int cflag,
 442                          unsigned int baud);
 443 unsigned int uart_get_baud_rate(struct uart_port *port, struct ktermios *termios,
 444                                 struct ktermios *old, unsigned int min,
 445                                 unsigned int max);
 446 unsigned int uart_get_divisor(struct uart_port *port, unsigned int baud);
 447
 448 /* Base timer interval for polling */
 449 static inline int uart_poll_timeout(struct uart_port *port)
 450 {
 451         int timeout = port->timeout;
 452
 453         return timeout > 6 ? (timeout / 2 - 2) : 1;
 454 }
 455
 456 /*
 457  * Console helpers.
 458  */
 459 struct uart_port *uart_get_console(struct uart_port *ports, int nr,
 460                                    struct console *c);
 461 void uart_parse_options(char *options, int *baud, int *parity, int *bits,
 462                         int *flow);
 463 int uart_set_options(struct uart_port *port, struct console *co, int baud,
 464                      int parity, int bits, int flow);
 465 struct tty_driver *uart_console_device(struct console *co, int *index);
 466 void uart_console_write(struct uart_port *port, const char *s,
 467                         unsigned int count,
 468                         void (*putchar)(struct uart_port *, int));
 469
 470 /*
 471  * Port/driver registration/removal
 472  */
 473 int uart_register_driver(struct uart_driver *uart);
 474 void uart_unregister_driver(struct uart_driver *uart);
 475 int uart_add_one_port(struct uart_driver *reg, struct uart_port *port);
 476 int uart_remove_one_port(struct uart_driver *reg, struct uart_port *port);
 477 int uart_match_port(struct uart_port *port1, struct uart_port *port2);
 478
 479 /*
 480  * Power Management
 481  */
 482 int uart_suspend_port(struct uart_driver *reg, struct uart_port *port);
 483 int uart_resume_port(struct uart_driver *reg, struct uart_port *port);
 484
 485 #define uart_circ_empty(circ)           ((circ)->head == (circ)->tail)
 486 #define uart_circ_clear(circ)           ((circ)->head = (circ)->tail = 0)
 487
 488 #define uart_circ_chars_pending(circ)   \
 489         (CIRC_CNT((circ)->head, (circ)->tail, UART_XMIT_SIZE))
 490
 491 #define uart_circ_chars_free(circ)      \
 492         (CIRC_SPACE((circ)->head, (circ)->tail, UART_XMIT_SIZE))
 493
 494 static inline int uart_tx_stopped(struct uart_port *port)
 495 {
 496         struct tty_struct *tty = port->state->port.tty;
 497         if(tty->stopped || tty->hw_stopped)
 498                 return 1;
 499         return 0;
 500 }
 501
 502 /*
 503  * The following are helper functions for the low level drivers.
 504  */
 505
 506 extern void uart_handle_dcd_change(struct uart_port *uport,
 507                 unsigned int status);
 508 extern void uart_handle_cts_change(struct uart_port *uport,
 509                 unsigned int status);
 510
 511 extern void uart_insert_char(struct uart_port *port, unsigned int status,
 512                  unsigned int overrun, unsigned int ch, unsigned int flag);
 513
 514 #ifdef SUPPORT_SYSRQ
 515 static inline int
 516 uart_handle_sysrq_char(struct uart_port *port, unsigned int ch)
 517 {
 518         if (port->sysrq) {
 519                 if (ch && time_before(jiffies, port->sysrq)) {
 520                         handle_sysrq(ch);
 521                         port->sysrq = 0;
 522                         return 1;
 523                 }
 524                 port->sysrq = 0;
 525         }
 526         return 0;
 527 }
 528 #else
 529 #define uart_handle_sysrq_char(port,ch) ({ (void)port; 0; })
 530 #endif
 531
 532 /*
 533  * We do the SysRQ and SAK checking like this...
 534  */
 535 static inline int uart_handle_break(struct uart_port *port)
 536 {
 537         struct uart_state *state = port->state;
 538
 539         if (port->handle_break)
 540                 port->handle_break(port);
 541
 542 #ifdef SUPPORT_SYSRQ
 543         if (port->cons && port->cons->index == port->line) {
 544                 if (!port->sysrq) {
 545                         port->sysrq = jiffies + HZ*5;
 546                         return 1;
 547                 }
 548                 port->sysrq = 0;
 549         }
 550 #endif
 551         if (port->flags & UPF_SAK)
 552                 do_SAK(state->port.tty);
 553         return 0;
 554 }
 555
 556 /*
 557  *      UART_ENABLE_MS - determine if port should enable modem status irqs
 558  */
 559 #define UART_ENABLE_MS(port,cflag)      ((port)->flags & UPF_HARDPPS_CD || \
 560                                          (cflag) & CRTSCTS || \
 561                                          !((cflag) & CLOCAL))
 562
 563 #endif
 564
 565 #endif /* LINUX_SERIAL_CORE_H */