sio.c revision 183692
151078Speter/*- 251078Speter * Copyright (c) 1991 The Regents of the University of California. 351078Speter * All rights reserved. 451078Speter * 551078Speter * Redistribution and use in source and binary forms, with or without 651078Speter * modification, are permitted provided that the following conditions 751078Speter * are met: 851078Speter * 1. Redistributions of source code must retain the above copyright 951078Speter * notice, this list of conditions and the following disclaimer. 1051078Speter * 2. Redistributions in binary form must reproduce the above copyright 1151078Speter * notice, this list of conditions and the following disclaimer in the 1251078Speter * documentation and/or other materials provided with the distribution. 1351078Speter * 4. Neither the name of the University nor the names of its contributors 1451078Speter * may be used to endorse or promote products derived from this software 1551078Speter * without specific prior written permission. 1651078Speter * 1751078Speter * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 1851078Speter * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1951078Speter * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2051078Speter * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 2151078Speter * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2251078Speter * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2351078Speter * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2451078Speter * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2551078Speter * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2651078Speter * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2751078Speter * SUCH DAMAGE. 2851078Speter * 2951078Speter * from: @(#)com.c 7.5 (Berkeley) 5/16/91 3051078Speter * from: i386/isa sio.c,v 1.234 3151078Speter */ 3251078Speter 33119419Sobrien#include <sys/cdefs.h> 34119419Sobrien__FBSDID("$FreeBSD: head/sys/dev/sio/sio.c 183692 2008-10-08 08:08:03Z imp $"); 35119419Sobrien 3651078Speter#include "opt_comconsole.h" 3751078Speter#include "opt_compat.h" 38131939Smarcel#include "opt_gdb.h" 39131939Smarcel#include "opt_kdb.h" 4051078Speter#include "opt_sio.h" 4151078Speter 4251078Speter/* 4351078Speter * Serial driver, based on 386BSD-0.1 com driver. 4451078Speter * Mostly rewritten to use pseudo-DMA. 4551078Speter * Works for National Semiconductor NS8250-NS16550AF UARTs. 4651078Speter * COM driver, based on HP dca driver. 4751078Speter * 48150460Simp * Changes for PC Card integration: 49150460Simp * - Added PC Card driver table and handlers 5051078Speter */ 5151078Speter#include <sys/param.h> 5276166Smarkm#include <sys/systm.h> 5365822Sjhb#include <sys/bus.h> 5451078Speter#include <sys/conf.h> 5551078Speter#include <sys/fcntl.h> 5651078Speter#include <sys/interrupt.h> 57131939Smarcel#include <sys/kdb.h> 5851078Speter#include <sys/kernel.h> 59114216Skan#include <sys/limits.h> 6076166Smarkm#include <sys/lock.h> 6176166Smarkm#include <sys/malloc.h> 6276166Smarkm#include <sys/module.h> 6376166Smarkm#include <sys/mutex.h> 6476166Smarkm#include <sys/proc.h> 6576166Smarkm#include <sys/reboot.h> 66131094Sphk#include <sys/serial.h> 6776166Smarkm#include <sys/sysctl.h> 6851078Speter#include <sys/syslog.h> 6976166Smarkm#include <sys/tty.h> 7051078Speter#include <machine/bus.h> 7151078Speter#include <sys/rman.h> 7251078Speter#include <sys/timepps.h> 7393466Sbde#include <sys/uio.h> 74119485Snjl#include <sys/cons.h> 7551078Speter 7686909Simp#include <isa/isavar.h> 7786909Simp 7851078Speter#include <machine/resource.h> 7951078Speter 8085302Simp#include <dev/sio/sioreg.h> 8185365Simp#include <dev/sio/siovar.h> 8251078Speter 8351078Speter#ifdef COM_ESP 8477726Sjoerg#include <dev/ic/esp.h> 8551078Speter#endif 8677726Sjoerg#include <dev/ic/ns16550.h> 8751078Speter 8851078Speter#define LOTS_OF_EVENTS 64 /* helps separate urgent events from input */ 8951078Speter 9051078Speter#ifdef COM_MULTIPORT 9151078Speter/* checks in flags for multiport and which is multiport "master chip" 9251078Speter * for a given card 9351078Speter */ 9451078Speter#define COM_ISMULTIPORT(flags) ((flags) & 0x01) 9551078Speter#define COM_MPMASTER(flags) (((flags) >> 8) & 0x0ff) 9651078Speter#define COM_NOTAST4(flags) ((flags) & 0x04) 97104067Sphk#else 98104067Sphk#define COM_ISMULTIPORT(flags) (0) 9951078Speter#endif /* COM_MULTIPORT */ 10051078Speter 101120175Sbde#define COM_C_IIR_TXRDYBUG 0x80000 10251078Speter#define COM_CONSOLE(flags) ((flags) & 0x10) 103120175Sbde#define COM_DEBUGGER(flags) ((flags) & 0x80) 104120175Sbde#define COM_FIFOSIZE(flags) (((flags) & 0xff000000) >> 24) 10551078Speter#define COM_FORCECONSOLE(flags) ((flags) & 0x20) 106120175Sbde#define COM_IIR_TXRDYBUG(flags) ((flags) & COM_C_IIR_TXRDYBUG) 10751078Speter#define COM_LLCONSOLE(flags) ((flags) & 0x40) 10851078Speter#define COM_LOSESOUTINTS(flags) ((flags) & 0x08) 109120175Sbde#define COM_NOFIFO(flags) ((flags) & 0x02) 110120175Sbde#define COM_NOPROBE(flags) ((flags) & 0x40000) 111120175Sbde#define COM_NOSCR(flags) ((flags) & 0x100000) 112111613Sphk#define COM_PPSCTS(flags) ((flags) & 0x10000) 113120175Sbde#define COM_ST16650A(flags) ((flags) & 0x20000) 114112384Ssobomax#define COM_TI16754(flags) ((flags) & 0x200000) 11551078Speter 11660471Snyan#define sio_getreg(com, off) \ 11760471Snyan (bus_space_read_1((com)->bst, (com)->bsh, (off))) 11860471Snyan#define sio_setreg(com, off, value) \ 11960471Snyan (bus_space_write_1((com)->bst, (com)->bsh, (off), (value))) 12060471Snyan 12151078Speter/* 12251078Speter * com state bits. 12351078Speter * (CS_BUSY | CS_TTGO) and (CS_BUSY | CS_TTGO | CS_ODEVREADY) must be higher 12451078Speter * than the other bits so that they can be tested as a group without masking 12551078Speter * off the low bits. 12651078Speter * 12751078Speter * The following com and tty flags correspond closely: 12851078Speter * CS_BUSY = TS_BUSY (maintained by comstart(), siopoll() and 12953344Speter * comstop()) 13051078Speter * CS_TTGO = ~TS_TTSTOP (maintained by comparam() and comstart()) 13151078Speter * CS_CTS_OFLOW = CCTS_OFLOW (maintained by comparam()) 13251078Speter * CS_RTS_IFLOW = CRTS_IFLOW (maintained by comparam()) 13351078Speter * TS_FLUSH is not used. 13451078Speter * XXX I think TIOCSETA doesn't clear TS_TTSTOP when it clears IXON. 13551078Speter * XXX CS_*FLOW should be CF_*FLOW in com->flags (control flags not state). 13651078Speter */ 13751078Speter#define CS_BUSY 0x80 /* output in progress */ 13851078Speter#define CS_TTGO 0x40 /* output not stopped by XOFF */ 13951078Speter#define CS_ODEVREADY 0x20 /* external device h/w ready (CTS) */ 14051078Speter#define CS_CHECKMSR 1 /* check of MSR scheduled */ 14151078Speter#define CS_CTS_OFLOW 2 /* use CTS output flow control */ 14251078Speter#define CS_ODONE 4 /* output completed */ 14351078Speter#define CS_RTS_IFLOW 8 /* use RTS input flow control */ 14451078Speter#define CSE_BUSYCHECK 1 /* siobusycheck() scheduled */ 14551078Speter 14651078Speterstatic char const * const error_desc[] = { 14751078Speter#define CE_OVERRUN 0 14851078Speter "silo overflow", 14951078Speter#define CE_INTERRUPT_BUF_OVERFLOW 1 15051078Speter "interrupt-level buffer overflow", 15151078Speter#define CE_TTY_BUF_OVERFLOW 2 15251078Speter "tty-level buffer overflow", 15351078Speter}; 15451078Speter 15586909Simp#define CE_NTYPES 3 15651078Speter#define CE_RECORD(com, errnum) (++(com)->delta_error_counts[errnum]) 15751078Speter 15886909Simp/* types. XXX - should be elsewhere */ 15986909Simptypedef u_int Port_t; /* hardware port */ 16086909Simptypedef u_char bool_t; /* boolean */ 16186909Simp 16286909Simp/* queue of linear buffers */ 16386909Simpstruct lbq { 16486909Simp u_char *l_head; /* next char to process */ 16586909Simp u_char *l_tail; /* one past the last char to process */ 16686909Simp struct lbq *l_next; /* next in queue */ 16786909Simp bool_t l_queued; /* nonzero if queued */ 16886909Simp}; 16986909Simp 17086909Simp/* com device structure */ 17186909Simpstruct com_s { 17286909Simp u_char state; /* miscellaneous flag bits */ 17386909Simp u_char cfcr_image; /* copy of value written to CFCR */ 17451078Speter#ifdef COM_ESP 17586909Simp bool_t esp; /* is this unit a hayes esp board? */ 17686909Simp#endif 17786909Simp u_char extra_state; /* more flag bits, separate for order trick */ 17886909Simp u_char fifo_image; /* copy of value written to FIFO */ 17986909Simp bool_t hasfifo; /* nonzero for 16550 UARTs */ 18086909Simp bool_t loses_outints; /* nonzero if device loses output interrupts */ 18186909Simp u_char mcr_image; /* copy of value written to MCR */ 18286909Simp#ifdef COM_MULTIPORT 18386909Simp bool_t multiport; /* is this unit part of a multiport device? */ 18486909Simp#endif /* COM_MULTIPORT */ 18586909Simp bool_t no_irq; /* nonzero if irq is not attached */ 18686909Simp bool_t gone; /* hardware disappeared */ 18786909Simp bool_t poll; /* nonzero if polling is required */ 18886909Simp bool_t poll_output; /* nonzero if polling for output is required */ 189120175Sbde bool_t st16650a; /* nonzero if Startech 16650A compatible */ 19086909Simp int unit; /* unit number */ 191120189Sbde u_int flags; /* copy of device flags */ 19286909Simp u_int tx_fifo_size; 19386909Simp 19486909Simp /* 19586909Simp * The high level of the driver never reads status registers directly 19686909Simp * because there would be too many side effects to handle conveniently. 19786909Simp * Instead, it reads copies of the registers stored here by the 19886909Simp * interrupt handler. 19986909Simp */ 20086909Simp u_char last_modem_status; /* last MSR read by intr handler */ 20186909Simp u_char prev_modem_status; /* last MSR handled by high level */ 20286909Simp 20386909Simp u_char *ibuf; /* start of input buffer */ 20486909Simp u_char *ibufend; /* end of input buffer */ 20586909Simp u_char *ibufold; /* old input buffer, to be freed */ 20686909Simp u_char *ihighwater; /* threshold in input buffer */ 20786909Simp u_char *iptr; /* next free spot in input buffer */ 20886909Simp int ibufsize; /* size of ibuf (not include error bytes) */ 20986909Simp int ierroff; /* offset of error bytes in ibuf */ 21086909Simp 21186909Simp struct lbq obufq; /* head of queue of output buffers */ 21286909Simp struct lbq obufs[2]; /* output buffers */ 21386909Simp 21486909Simp bus_space_tag_t bst; 21586909Simp bus_space_handle_t bsh; 21686909Simp 21786909Simp Port_t data_port; /* i/o ports */ 21886909Simp#ifdef COM_ESP 21986909Simp Port_t esp_port; 22086909Simp#endif 221120189Sbde Port_t int_ctl_port; 22286909Simp Port_t int_id_port; 22386909Simp Port_t modem_ctl_port; 22486909Simp Port_t line_status_port; 22586909Simp Port_t modem_status_port; 22686909Simp 22786909Simp struct tty *tp; /* cross reference */ 22886909Simp 22986909Simp struct pps_state pps; 230111613Sphk int pps_bit; 231119485Snjl#ifdef ALT_BREAK_TO_DEBUGGER 232119485Snjl int alt_brk_state; 233119485Snjl#endif 23486909Simp 23586909Simp u_long bytes_in; /* statistics */ 23686909Simp u_long bytes_out; 23786909Simp u_int delta_error_counts[CE_NTYPES]; 23886909Simp u_long error_counts[CE_NTYPES]; 23986909Simp 24089986Sjhay u_long rclk; 24189986Sjhay 24286909Simp struct resource *irqres; 24386909Simp struct resource *ioportres; 244116120Sscottl int ioportrid; 245116120Sscottl void *cookie; 24686909Simp 24786909Simp /* 24886909Simp * Data area for output buffers. Someday we should build the output 24986909Simp * buffer queue without copying data. 25086909Simp */ 25186909Simp u_char obuf1[256]; 25286909Simp u_char obuf2[256]; 25386909Simp}; 25486909Simp 25586909Simp#ifdef COM_ESP 25693010Sbdestatic int espattach(struct com_s *com, Port_t esp_port); 25751078Speter#endif 25851078Speter 259131373Sphkstatic void combreak(struct tty *tp, int sig); 26051078Speterstatic timeout_t siobusycheck; 26193010Sbdestatic u_int siodivisor(u_long rclk, speed_t speed); 262136478Sphkstatic void comclose(struct tty *tp); 263136478Sphkstatic int comopen(struct tty *tp, struct cdev *dev); 26493010Sbdestatic void sioinput(struct com_s *com); 26593010Sbdestatic void siointr1(struct com_s *com); 266166901Spisostatic int siointr(void *arg); 267131094Sphkstatic int commodem(struct tty *tp, int sigon, int sigoff); 26893010Sbdestatic int comparam(struct tty *tp, struct termios *t); 26993010Sbdestatic void siopoll(void *); 27093010Sbdestatic void siosettimeout(void); 27193010Sbdestatic int siosetwater(struct com_s *com, speed_t speed); 27293010Sbdestatic void comstart(struct tty *tp); 27393010Sbdestatic void comstop(struct tty *tp, int rw); 27451078Speterstatic timeout_t comwakeup; 27551078Speter 27685365Simpchar sio_driver_name[] = "sio"; 27770174Sjhbstatic struct mtx sio_lock; 27870174Sjhbstatic int sio_inited; 27951078Speter 28051078Speter/* table and macro for fast conversion from a unit number to its com struct */ 28185365Simpdevclass_t sio_devclass; 28251078Speter#define com_addr(unit) ((struct com_s *) \ 28386909Simp devclass_get_softc(sio_devclass, unit)) /* XXX */ 28451078Speter 285114722Sobrienint comconsole = -1; 28651078Speterstatic volatile speed_t comdefaultrate = CONSPEED; 28789986Sjhaystatic u_long comdefaultrclk = DEFAULT_RCLK; 28889986SjhaySYSCTL_ULONG(_machdep, OID_AUTO, conrclk, CTLFLAG_RW, &comdefaultrclk, 0, ""); 28998401Sn_hibmastatic speed_t gdbdefaultrate = GDBSPEED; 29098401Sn_hibmaSYSCTL_UINT(_machdep, OID_AUTO, gdbspeed, CTLFLAG_RW, 29198401Sn_hibma &gdbdefaultrate, GDBSPEED, ""); 29251078Speterstatic u_int com_events; /* input chars + weighted output completions */ 29351078Speterstatic Port_t siocniobase; 29498401Sn_hibmastatic int siocnunit = -1; 29572238Sjhbstatic void *sio_slow_ih; 29672238Sjhbstatic void *sio_fast_ih; 29751078Speterstatic int sio_timeout; 29851078Speterstatic int sio_timeouts_until_log; 29951078Speterstatic struct callout_handle sio_timeout_handle 30051078Speter = CALLOUT_HANDLE_INITIALIZER(&sio_timeout_handle); 30153344Speterstatic int sio_numunits; 30251078Speter 303131939Smarcel#ifdef GDB 304131939Smarcelstatic Port_t siogdbiobase = 0; 305131939Smarcel#endif 306131939Smarcel 30751078Speter#ifdef COM_ESP 30851078Speter/* XXX configure this properly. */ 30986909Simp/* XXX quite broken for new-bus. */ 31051078Speterstatic Port_t likely_com_ports[] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8, }; 31151078Speterstatic Port_t likely_esp_ports[] = { 0x140, 0x180, 0x280, 0 }; 31251078Speter#endif 31351078Speter 31451078Speter/* 31551078Speter * handle sysctl read/write requests for console speed 31651078Speter * 31751078Speter * In addition to setting comdefaultrate for I/O through /dev/console, 31851078Speter * also set the initial and lock values for the /dev/ttyXX device 31951078Speter * if there is one associated with the console. Finally, if the /dev/tty 32051078Speter * device has already been open, change the speed on the open running port 32151078Speter * itself. 32251078Speter */ 32351078Speter 32451078Speterstatic int 32562573Sphksysctl_machdep_comdefaultrate(SYSCTL_HANDLER_ARGS) 32651078Speter{ 32751078Speter int error, s; 32851078Speter speed_t newspeed; 32951078Speter struct com_s *com; 33051078Speter struct tty *tp; 33151078Speter 33251078Speter newspeed = comdefaultrate; 33351078Speter 33451078Speter error = sysctl_handle_opaque(oidp, &newspeed, sizeof newspeed, req); 33551078Speter if (error || !req->newptr) 33651078Speter return (error); 33751078Speter 33851078Speter comdefaultrate = newspeed; 33951078Speter 34051078Speter if (comconsole < 0) /* serial console not selected? */ 34151078Speter return (0); 34251078Speter 34351078Speter com = com_addr(comconsole); 34457915Simp if (com == NULL) 34551078Speter return (ENXIO); 34651078Speter 347135329Sphk tp = com->tp; 348135516Snyan if (tp == NULL) 349135516Snyan return (ENXIO); 350135516Snyan 35151078Speter /* 35251078Speter * set the initial and lock rates for /dev/ttydXX and /dev/cuaXX 35351078Speter * (note, the lock rates really are boolean -- if non-zero, disallow 35451078Speter * speed changes) 35551078Speter */ 356135329Sphk tp->t_init_in.c_ispeed = tp->t_init_in.c_ospeed = 357135329Sphk tp->t_lock_in.c_ispeed = tp->t_lock_in.c_ospeed = 358135329Sphk tp->t_init_out.c_ispeed = tp->t_init_out.c_ospeed = 359135329Sphk tp->t_lock_out.c_ispeed = tp->t_lock_out.c_ospeed = comdefaultrate; 36051078Speter 361135516Snyan if (tp->t_state & TS_ISOPEN) { 36251078Speter tp->t_termios.c_ispeed = 36351078Speter tp->t_termios.c_ospeed = comdefaultrate; 36451078Speter s = spltty(); 36551078Speter error = comparam(tp, &tp->t_termios); 36651078Speter splx(s); 36751078Speter } 36851078Speter return error; 36951078Speter} 37051078Speter 37151078SpeterSYSCTL_PROC(_machdep, OID_AUTO, conspeed, CTLTYPE_INT | CTLFLAG_RW, 37251078Speter 0, 0, sysctl_machdep_comdefaultrate, "I", ""); 373153195SimpTUNABLE_INT("machdep.conspeed", __DEVOLATILE(int *, &comdefaultrate)); 37451078Speter 37586909Simp#define SET_FLAG(dev, bit) device_set_flags(dev, device_get_flags(dev) | (bit)) 37686909Simp#define CLR_FLAG(dev, bit) device_set_flags(dev, device_get_flags(dev) & ~(bit)) 37786909Simp 37886909Simp/* 37986909Simp * Unload the driver and clear the table. 38086909Simp * XXX this is mostly wrong. 38186909Simp * XXX TODO: 38286909Simp * This is usually called when the card is ejected, but 383104933Simp * can be caused by a kldunload of a controller driver. 38486909Simp * The idea is to reset the driver's view of the device 38586909Simp * and ensure that any driver entry points such as 38686909Simp * read and write do not hang. 38786909Simp */ 38885365Simpint 389136478Sphksiodetach(device_t dev) 39051078Speter{ 39151078Speter struct com_s *com; 39251078Speter 39352471Simp com = (struct com_s *) device_get_softc(dev); 39457915Simp if (com == NULL) { 39552471Simp device_printf(dev, "NULL com in siounload\n"); 39654386Simp return (0); 39751078Speter } 398120175Sbde com->gone = TRUE; 399132561Simp if (com->tp) 400136478Sphk ttyfree(com->tp); 40154386Simp if (com->irqres) { 40254386Simp bus_teardown_intr(dev, com->irqres, com->cookie); 40354386Simp bus_release_resource(dev, SYS_RES_IRQ, 0, com->irqres); 40454386Simp } 40554386Simp if (com->ioportres) 406116120Sscottl bus_release_resource(dev, SYS_RES_IOPORT, com->ioportrid, 407116120Sscottl com->ioportres); 408136478Sphk if (com->ibuf != NULL) 409136478Sphk free(com->ibuf, M_DEVBUF); 410136478Sphk 411136478Sphk device_set_softc(dev, NULL); 412136478Sphk free(com, M_DEVBUF); 41353978Simp return (0); 41451078Speter} 41551078Speter 41685365Simpint 41789986Sjhaysioprobe(dev, xrid, rclk, noprobe) 41858885Simp device_t dev; 41958885Simp int xrid; 42089986Sjhay u_long rclk; 42185365Simp int noprobe; 42251078Speter{ 42353344Speter#if 0 42451078Speter static bool_t already_init; 42553344Speter device_t xdev; 42653344Speter#endif 42760471Snyan struct com_s *com; 42889986Sjhay u_int divisor; 42951078Speter bool_t failures[10]; 43051078Speter int fn; 43151078Speter device_t idev; 43251078Speter Port_t iobase; 43351078Speter intrmask_t irqmap[4]; 43451078Speter intrmask_t irqs; 43551078Speter u_char mcr_image; 43651078Speter int result; 43754206Speter u_long xirq; 43851088Speter u_int flags = device_get_flags(dev); 43951078Speter int rid; 44051078Speter struct resource *port; 44151078Speter 44258885Simp rid = xrid; 44351078Speter port = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid, 44451078Speter 0, ~0, IO_COMSIZE, RF_ACTIVE); 44551078Speter if (!port) 44657915Simp return (ENXIO); 44751078Speter 44886909Simp com = malloc(sizeof(*com), M_DEVBUF, M_NOWAIT | M_ZERO); 449124669Sru if (com == NULL) { 450124669Sru bus_release_resource(dev, SYS_RES_IOPORT, rid, port); 45186909Simp return (ENOMEM); 452124669Sru } 45386909Simp device_set_softc(dev, com); 45460471Snyan com->bst = rman_get_bustag(port); 45560471Snyan com->bsh = rman_get_bushandle(port); 45689986Sjhay if (rclk == 0) 45789986Sjhay rclk = DEFAULT_RCLK; 45889986Sjhay com->rclk = rclk; 45960471Snyan 46085209Sjhb while (sio_inited != 2) 46185209Sjhb if (atomic_cmpset_int(&sio_inited, 0, 1)) { 46293818Sjhb mtx_init(&sio_lock, sio_driver_name, NULL, 46393818Sjhb (comconsole != -1) ? 46485209Sjhb MTX_SPIN | MTX_QUIET : MTX_SPIN); 46585209Sjhb atomic_store_rel_int(&sio_inited, 2); 46685209Sjhb } 46770174Sjhb 46853344Speter#if 0 46953344Speter /* 47053344Speter * XXX this is broken - when we are first called, there are no 47153344Speter * previously configured IO ports. We could hard code 47253344Speter * 0x3f8, 0x2f8, 0x3e8, 0x2e8 etc but that's probably worse. 47353344Speter * This code has been doing nothing since the conversion since 47453344Speter * "count" is zero the first time around. 47553344Speter */ 47651078Speter if (!already_init) { 47751078Speter /* 47851078Speter * Turn off MCR_IENABLE for all likely serial ports. An unused 47951078Speter * port with its MCR_IENABLE gate open will inhibit interrupts 48051078Speter * from any used port that shares the interrupt vector. 48151078Speter * XXX the gate enable is elsewhere for some multiports. 48251078Speter */ 48351078Speter device_t *devs; 48453344Speter int count, i, xioport; 48551078Speter 48651078Speter devclass_get_devices(sio_devclass, &devs, &count); 48751078Speter for (i = 0; i < count; i++) { 48851078Speter xdev = devs[i]; 48954194Speter if (device_is_enabled(xdev) && 49054194Speter bus_get_resource(xdev, SYS_RES_IOPORT, 0, &xioport, 49154194Speter NULL) == 0) 49253344Speter outb(xioport + com_mcr, 0); 49351078Speter } 49451078Speter free(devs, M_TEMP); 49551078Speter already_init = TRUE; 49651078Speter } 49753344Speter#endif 49851078Speter 49951078Speter if (COM_LLCONSOLE(flags)) { 50051078Speter printf("sio%d: reserved for low-level i/o\n", 50151078Speter device_get_unit(dev)); 50256788Sbde bus_release_resource(dev, SYS_RES_IOPORT, rid, port); 50386909Simp device_set_softc(dev, NULL); 50486909Simp free(com, M_DEVBUF); 50551078Speter return (ENXIO); 50651078Speter } 50751078Speter 50851078Speter /* 50951078Speter * If the device is on a multiport card and has an AST/4 51051078Speter * compatible interrupt control register, initialize this 51151078Speter * register and prepare to leave MCR_IENABLE clear in the mcr. 51251078Speter * Otherwise, prepare to set MCR_IENABLE in the mcr. 51351078Speter * Point idev to the device struct giving the correct id_irq. 51451078Speter * This is the struct for the master device if there is one. 51551078Speter */ 51651078Speter idev = dev; 51751078Speter mcr_image = MCR_IENABLE; 51851078Speter#ifdef COM_MULTIPORT 51957234Sbde if (COM_ISMULTIPORT(flags)) { 52054206Speter Port_t xiobase; 52154206Speter u_long io; 52254206Speter 52351078Speter idev = devclass_get_device(sio_devclass, COM_MPMASTER(flags)); 52451078Speter if (idev == NULL) { 52551078Speter printf("sio%d: master device %d not configured\n", 52651078Speter device_get_unit(dev), COM_MPMASTER(flags)); 52751078Speter idev = dev; 52851078Speter } 52957234Sbde if (!COM_NOTAST4(flags)) { 53057234Sbde if (bus_get_resource(idev, SYS_RES_IOPORT, 0, &io, 53157234Sbde NULL) == 0) { 53257234Sbde xiobase = io; 53357234Sbde if (bus_get_resource(idev, SYS_RES_IRQ, 0, 53457234Sbde NULL, NULL) == 0) 53557234Sbde outb(xiobase + com_scr, 0x80); 53657234Sbde else 53757234Sbde outb(xiobase + com_scr, 0); 53857234Sbde } 53957234Sbde mcr_image = 0; 54051078Speter } 54151078Speter } 54251078Speter#endif /* COM_MULTIPORT */ 54354194Speter if (bus_get_resource(idev, SYS_RES_IRQ, 0, NULL, NULL) != 0) 54451078Speter mcr_image = 0; 54551078Speter 54651078Speter bzero(failures, sizeof failures); 54751078Speter iobase = rman_get_start(port); 54851078Speter 54951078Speter /* 55051078Speter * We don't want to get actual interrupts, just masked ones. 55151078Speter * Interrupts from this line should already be masked in the ICU, 55251078Speter * but mask them in the processor as well in case there are some 55351078Speter * (misconfigured) shared interrupts. 55451078Speter */ 55572200Sbmilekic mtx_lock_spin(&sio_lock); 55651078Speter/* EXTRA DELAY? */ 55751078Speter 55851078Speter /* 559112384Ssobomax * For the TI16754 chips, set prescaler to 1 (4 is often the 560112384Ssobomax * default after-reset value) as otherwise it's impossible to 561112270Ssobomax * get highest baudrates. 562112270Ssobomax */ 563112270Ssobomax if (COM_TI16754(flags)) { 564112384Ssobomax u_char cfcr, efr; 565112270Ssobomax 566112384Ssobomax cfcr = sio_getreg(com, com_cfcr); 567112384Ssobomax sio_setreg(com, com_cfcr, CFCR_EFR_ENABLE); 568112384Ssobomax efr = sio_getreg(com, com_efr); 569112384Ssobomax /* Unlock extended features to turn off prescaler. */ 570112384Ssobomax sio_setreg(com, com_efr, efr | EFR_EFE); 571112384Ssobomax /* Disable EFR. */ 572112384Ssobomax sio_setreg(com, com_cfcr, (cfcr != CFCR_EFR_ENABLE) ? cfcr : 0); 573112384Ssobomax /* Turn off prescaler. */ 574112384Ssobomax sio_setreg(com, com_mcr, 575112384Ssobomax sio_getreg(com, com_mcr) & ~MCR_PRESCALE); 576112384Ssobomax sio_setreg(com, com_cfcr, CFCR_EFR_ENABLE); 577112384Ssobomax sio_setreg(com, com_efr, efr); 578112384Ssobomax sio_setreg(com, com_cfcr, cfcr); 579112270Ssobomax } 580112384Ssobomax 581112270Ssobomax /* 58251078Speter * Initialize the speed and the word size and wait long enough to 58351078Speter * drain the maximum of 16 bytes of junk in device output queues. 58451078Speter * The speed is undefined after a master reset and must be set 58551078Speter * before relying on anything related to output. There may be 58651078Speter * junk after a (very fast) soft reboot and (apparently) after 58751078Speter * master reset. 58851078Speter * XXX what about the UART bug avoided by waiting in comparam()? 58951078Speter * We don't want to to wait long enough to drain at 2 bps. 59051078Speter */ 59151078Speter if (iobase == siocniobase) 59251078Speter DELAY((16 + 1) * 1000000 / (comdefaultrate / 10)); 59351078Speter else { 59460471Snyan sio_setreg(com, com_cfcr, CFCR_DLAB | CFCR_8BITS); 59589986Sjhay divisor = siodivisor(rclk, SIO_TEST_SPEED); 59689986Sjhay sio_setreg(com, com_dlbl, divisor & 0xff); 59789986Sjhay sio_setreg(com, com_dlbh, divisor >> 8); 59860471Snyan sio_setreg(com, com_cfcr, CFCR_8BITS); 59951078Speter DELAY((16 + 1) * 1000000 / (SIO_TEST_SPEED / 10)); 60051078Speter } 60151078Speter 60251078Speter /* 603172568Skevlo * Enable the interrupt gate and disable device interrupts. This 60451078Speter * should leave the device driving the interrupt line low and 60551078Speter * guarantee an edge trigger if an interrupt can be generated. 60651078Speter */ 60751078Speter/* EXTRA DELAY? */ 60860471Snyan sio_setreg(com, com_mcr, mcr_image); 60960471Snyan sio_setreg(com, com_ier, 0); 61051078Speter DELAY(1000); /* XXX */ 61151078Speter irqmap[0] = isa_irq_pending(); 61251078Speter 61351078Speter /* 61451078Speter * Attempt to set loopback mode so that we can send a null byte 61551078Speter * without annoying any external device. 61651078Speter */ 61751078Speter/* EXTRA DELAY? */ 61860471Snyan sio_setreg(com, com_mcr, mcr_image | MCR_LOOPBACK); 61951078Speter 62051078Speter /* 62151078Speter * Attempt to generate an output interrupt. On 8250's, setting 62251078Speter * IER_ETXRDY generates an interrupt independent of the current 62351078Speter * setting and independent of whether the THR is empty. On 16450's, 62451078Speter * setting IER_ETXRDY generates an interrupt independent of the 62551078Speter * current setting. On 16550A's, setting IER_ETXRDY only 62651078Speter * generates an interrupt when IER_ETXRDY is not already set. 62751078Speter */ 62860471Snyan sio_setreg(com, com_ier, IER_ETXRDY); 62951078Speter 63051078Speter /* 63151078Speter * On some 16x50 incompatibles, setting IER_ETXRDY doesn't generate 63251078Speter * an interrupt. They'd better generate one for actually doing 63351078Speter * output. Loopback may be broken on the same incompatibles but 63451078Speter * it's unlikely to do more than allow the null byte out. 63551078Speter */ 63660471Snyan sio_setreg(com, com_data, 0); 637120468Sbde if (iobase == siocniobase) 638120468Sbde DELAY((1 + 2) * 1000000 / (comdefaultrate / 10)); 639120468Sbde else 640120468Sbde DELAY((1 + 2) * 1000000 / (SIO_TEST_SPEED / 10)); 64151078Speter 64251078Speter /* 64351078Speter * Turn off loopback mode so that the interrupt gate works again 64451078Speter * (MCR_IENABLE was hidden). This should leave the device driving 64551078Speter * an interrupt line high. It doesn't matter if the interrupt 64651078Speter * line oscillates while we are not looking at it, since interrupts 64751078Speter * are disabled. 64851078Speter */ 64951078Speter/* EXTRA DELAY? */ 65060471Snyan sio_setreg(com, com_mcr, mcr_image); 65192401Simp 65292401Simp /* 65392401Simp * It seems my Xircom CBEM56G Cardbus modem wants to be reset 65492401Simp * to 8 bits *again*, or else probe test 0 will fail. 65592401Simp * gwk@sgi.com, 4/19/2001 65692401Simp */ 65792401Simp sio_setreg(com, com_cfcr, CFCR_8BITS); 65851078Speter 65951078Speter /* 660120189Sbde * Some PCMCIA cards (Palido 321s, DC-1S, ...) have the "TXRDY bug", 661120189Sbde * so we probe for a buggy IIR_TXRDY implementation even in the 662120189Sbde * noprobe case. We don't probe for it in the !noprobe case because 663120189Sbde * noprobe is always set for PCMCIA cards and the problem is not 664120189Sbde * known to affect any other cards. 66551078Speter */ 66685365Simp if (noprobe) { 667120189Sbde /* Read IIR a few times. */ 66853370Speter for (fn = 0; fn < 2; fn ++) { 66953370Speter DELAY(10000); 67060471Snyan failures[6] = sio_getreg(com, com_iir); 67153370Speter } 672120189Sbde 673120189Sbde /* IIR_TXRDY should be clear. Is it? */ 67453370Speter result = 0; 67553370Speter if (failures[6] & IIR_TXRDY) { 676120189Sbde /* 677120189Sbde * No. We seem to have the bug. Does our fix for 678120189Sbde * it work? 679120189Sbde */ 68060471Snyan sio_setreg(com, com_ier, 0); 68160471Snyan if (sio_getreg(com, com_iir) & IIR_NOPEND) { 682120189Sbde /* Yes. We discovered the TXRDY bug! */ 68353370Speter SET_FLAG(dev, COM_C_IIR_TXRDYBUG); 68453370Speter } else { 685120189Sbde /* No. Just fail. XXX */ 68653370Speter result = ENXIO; 68781793Simp sio_setreg(com, com_mcr, 0); 68853370Speter } 68951078Speter } else { 690120189Sbde /* Yes. No bug. */ 69153370Speter CLR_FLAG(dev, COM_C_IIR_TXRDYBUG); 69251078Speter } 69381793Simp sio_setreg(com, com_ier, 0); 69460471Snyan sio_setreg(com, com_cfcr, CFCR_8BITS); 69572200Sbmilekic mtx_unlock_spin(&sio_lock); 69653344Speter bus_release_resource(dev, SYS_RES_IOPORT, rid, port); 697128899Sambrisko if (iobase == siocniobase) 69886909Simp result = 0; 699183692Simp /* 700183692Simp * XXX: Since we don't return 0, we shouldn't be relying on 701183692Simp * the softc that we set to persist to the call to attach 702183692Simp * since other probe routines may be called, and the malloc 703183692Simp * here causes subr_bus to not allocate anything for the 704183692Simp * other probes. Instead, this softc is preserved and other 705183692Simp * probe routines can corrupt it. 706183692Simp */ 70786909Simp if (result != 0) { 70886909Simp device_set_softc(dev, NULL); 70986909Simp free(com, M_DEVBUF); 71086909Simp } 711160420Simp return (result == 0 ? BUS_PROBE_DEFAULT + 1 : result); 71253344Speter } 71353344Speter 71451078Speter /* 71551078Speter * Check that 71651078Speter * o the CFCR, IER and MCR in UART hold the values written to them 71751078Speter * (the values happen to be all distinct - this is good for 71851078Speter * avoiding false positive tests from bus echoes). 71951078Speter * o an output interrupt is generated and its vector is correct. 72051078Speter * o the interrupt goes away when the IIR in the UART is read. 72151078Speter */ 72251078Speter/* EXTRA DELAY? */ 72360471Snyan failures[0] = sio_getreg(com, com_cfcr) - CFCR_8BITS; 72460471Snyan failures[1] = sio_getreg(com, com_ier) - IER_ETXRDY; 725112270Ssobomax failures[2] = sio_getreg(com, com_mcr) - mcr_image; 72651078Speter DELAY(10000); /* Some internal modems need this time */ 72751078Speter irqmap[1] = isa_irq_pending(); 72860471Snyan failures[4] = (sio_getreg(com, com_iir) & IIR_IMASK) - IIR_TXRDY; 72951078Speter DELAY(1000); /* XXX */ 73051078Speter irqmap[2] = isa_irq_pending(); 73160471Snyan failures[6] = (sio_getreg(com, com_iir) & IIR_IMASK) - IIR_NOPEND; 73251078Speter 73351078Speter /* 73451078Speter * Turn off all device interrupts and check that they go off properly. 73551078Speter * Leave MCR_IENABLE alone. For ports without a master port, it gates 73651078Speter * the OUT2 output of the UART to 73751078Speter * the ICU input. Closing the gate would give a floating ICU input 73851078Speter * (unless there is another device driving it) and spurious interrupts. 73951078Speter * (On the system that this was first tested on, the input floats high 74051078Speter * and gives a (masked) interrupt as soon as the gate is closed.) 74151078Speter */ 74260471Snyan sio_setreg(com, com_ier, 0); 74360471Snyan sio_setreg(com, com_cfcr, CFCR_8BITS); /* dummy to avoid bus echo */ 74460471Snyan failures[7] = sio_getreg(com, com_ier); 74551078Speter DELAY(1000); /* XXX */ 74651078Speter irqmap[3] = isa_irq_pending(); 74760471Snyan failures[9] = (sio_getreg(com, com_iir) & IIR_IMASK) - IIR_NOPEND; 74851078Speter 74972200Sbmilekic mtx_unlock_spin(&sio_lock); 75051078Speter 75151078Speter irqs = irqmap[1] & ~irqmap[0]; 75254194Speter if (bus_get_resource(idev, SYS_RES_IRQ, 0, &xirq, NULL) == 0 && 75389463Simp ((1 << xirq) & irqs) == 0) { 75451078Speter printf( 75554206Speter "sio%d: configured irq %ld not in bitmap of probed irqs %#x\n", 75653344Speter device_get_unit(dev), xirq, irqs); 75789447Sbmah printf( 75889470Sbmah "sio%d: port may not be enabled\n", 75989447Sbmah device_get_unit(dev)); 76089463Simp } 76151078Speter if (bootverbose) 76251078Speter printf("sio%d: irq maps: %#x %#x %#x %#x\n", 76351078Speter device_get_unit(dev), 76451078Speter irqmap[0], irqmap[1], irqmap[2], irqmap[3]); 76551078Speter 766128899Sambrisko result = 0; 767128899Sambrisko for (fn = 0; fn < sizeof failures; ++fn) 76851078Speter if (failures[fn]) { 76960471Snyan sio_setreg(com, com_mcr, 0); 77051078Speter result = ENXIO; 77151078Speter if (bootverbose) { 77251078Speter printf("sio%d: probe failed test(s):", 77351078Speter device_get_unit(dev)); 77451078Speter for (fn = 0; fn < sizeof failures; ++fn) 77551078Speter if (failures[fn]) 77651078Speter printf(" %d", fn); 77751078Speter printf("\n"); 77851078Speter } 77951078Speter break; 78051078Speter } 78151078Speter bus_release_resource(dev, SYS_RES_IOPORT, rid, port); 782128899Sambrisko if (iobase == siocniobase) 78386909Simp result = 0; 784183692Simp /* 785183692Simp * XXX: Since we don't return 0, we shouldn't be relying on the softc 786183692Simp * that we set to persist to the call to attach since other probe 787183692Simp * routines may be called, and the malloc here causes subr_bus to not 788183692Simp * allocate anything for the other probes. Instead, this softc is 789183692Simp * preserved and other probe routines can corrupt it. 790183692Simp */ 79186909Simp if (result != 0) { 79286909Simp device_set_softc(dev, NULL); 79386909Simp free(com, M_DEVBUF); 79486909Simp } 795160420Simp return (result == 0 ? BUS_PROBE_DEFAULT + 1 : result); 79651078Speter} 79751078Speter 79851078Speter#ifdef COM_ESP 79951078Speterstatic int 80051078Speterespattach(com, esp_port) 80151078Speter struct com_s *com; 80251078Speter Port_t esp_port; 80351078Speter{ 80451078Speter u_char dips; 80551078Speter u_char val; 80651078Speter 80751078Speter /* 80851078Speter * Check the ESP-specific I/O port to see if we're an ESP 80951078Speter * card. If not, return failure immediately. 81051078Speter */ 81151078Speter if ((inb(esp_port) & 0xf3) == 0) { 81251078Speter printf(" port 0x%x is not an ESP board?\n", esp_port); 81351078Speter return (0); 81451078Speter } 81551078Speter 81651078Speter /* 81751078Speter * We've got something that claims to be a Hayes ESP card. 81851078Speter * Let's hope so. 81951078Speter */ 82051078Speter 82151078Speter /* Get the dip-switch configuration */ 82251078Speter outb(esp_port + ESP_CMD1, ESP_GETDIPS); 82351078Speter dips = inb(esp_port + ESP_STATUS1); 82451078Speter 82551078Speter /* 82651078Speter * Bits 0,1 of dips say which COM port we are. 82751078Speter */ 82860471Snyan if (rman_get_start(com->ioportres) == likely_com_ports[dips & 0x03]) 82951078Speter printf(" : ESP"); 83051078Speter else { 83151078Speter printf(" esp_port has com %d\n", dips & 0x03); 83251078Speter return (0); 83351078Speter } 83451078Speter 83551078Speter /* 83651078Speter * Check for ESP version 2.0 or later: bits 4,5,6 = 010. 83751078Speter */ 83851078Speter outb(esp_port + ESP_CMD1, ESP_GETTEST); 83951078Speter val = inb(esp_port + ESP_STATUS1); /* clear reg 1 */ 84051078Speter val = inb(esp_port + ESP_STATUS2); 84151078Speter if ((val & 0x70) < 0x20) { 84251078Speter printf("-old (%o)", val & 0x70); 84351078Speter return (0); 84451078Speter } 84551078Speter 84651078Speter /* 84751078Speter * Check for ability to emulate 16550: bit 7 == 1 84851078Speter */ 84951078Speter if ((dips & 0x80) == 0) { 85051078Speter printf(" slave"); 85151078Speter return (0); 85251078Speter } 85351078Speter 85451078Speter /* 85551078Speter * Okay, we seem to be a Hayes ESP card. Whee. 85651078Speter */ 85751078Speter com->esp = TRUE; 85851078Speter com->esp_port = esp_port; 85951078Speter return (1); 86051078Speter} 86151078Speter#endif /* COM_ESP */ 86251078Speter 86385365Simpint 86489986Sjhaysioattach(dev, xrid, rclk) 86551078Speter device_t dev; 86658885Simp int xrid; 86789986Sjhay u_long rclk; 86851078Speter{ 86951078Speter struct com_s *com; 87051078Speter#ifdef COM_ESP 87151078Speter Port_t *espp; 87251078Speter#endif 87351078Speter Port_t iobase; 87451078Speter int unit; 87553344Speter u_int flags; 87651078Speter int rid; 87751078Speter struct resource *port; 87853344Speter int ret; 879136478Sphk int error; 880135329Sphk struct tty *tp; 88151078Speter 88258885Simp rid = xrid; 88351078Speter port = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid, 88451078Speter 0, ~0, IO_COMSIZE, RF_ACTIVE); 88551078Speter if (!port) 88657915Simp return (ENXIO); 88751078Speter 88851078Speter iobase = rman_get_start(port); 88951078Speter unit = device_get_unit(dev); 89051078Speter com = device_get_softc(dev); 89153344Speter flags = device_get_flags(dev); 89251078Speter 89353344Speter if (unit >= sio_numunits) 89453344Speter sio_numunits = unit + 1; 89551078Speter /* 89651078Speter * sioprobe() has initialized the device registers as follows: 89751078Speter * o cfcr = CFCR_8BITS. 89851078Speter * It is most important that CFCR_DLAB is off, so that the 89951078Speter * data port is not hidden when we enable interrupts. 90051078Speter * o ier = 0. 90151078Speter * Interrupts are only enabled when the line is open. 90251078Speter * o mcr = MCR_IENABLE, or 0 if the port has AST/4 compatible 90351078Speter * interrupt control register or the config specifies no irq. 90451078Speter * Keeping MCR_DTR and MCR_RTS off might stop the external 90551078Speter * device from sending before we are ready. 90651078Speter */ 90751078Speter bzero(com, sizeof *com); 90851078Speter com->unit = unit; 90951078Speter com->ioportres = port; 910116120Sscottl com->ioportrid = rid; 91160471Snyan com->bst = rman_get_bustag(port); 91260471Snyan com->bsh = rman_get_bushandle(port); 91351078Speter com->cfcr_image = CFCR_8BITS; 91451078Speter com->loses_outints = COM_LOSESOUTINTS(flags) != 0; 91557234Sbde com->no_irq = bus_get_resource(dev, SYS_RES_IRQ, 0, NULL, NULL) != 0; 91651078Speter com->tx_fifo_size = 1; 91751078Speter com->obufs[0].l_head = com->obuf1; 91851078Speter com->obufs[1].l_head = com->obuf2; 91951078Speter 92051078Speter com->data_port = iobase + com_data; 921120189Sbde com->int_ctl_port = iobase + com_ier; 92251078Speter com->int_id_port = iobase + com_iir; 92351078Speter com->modem_ctl_port = iobase + com_mcr; 92451078Speter com->mcr_image = inb(com->modem_ctl_port); 92551078Speter com->line_status_port = iobase + com_lsr; 92651078Speter com->modem_status_port = iobase + com_msr; 92751078Speter 928135367Sphk tp = com->tp = ttyalloc(); 929135329Sphk tp->t_oproc = comstart; 930135329Sphk tp->t_param = comparam; 931135329Sphk tp->t_stop = comstop; 932135329Sphk tp->t_modem = commodem; 933135329Sphk tp->t_break = combreak; 934136478Sphk tp->t_close = comclose; 935136478Sphk tp->t_open = comopen; 936135329Sphk tp->t_sc = com; 937135329Sphk 93889986Sjhay if (rclk == 0) 93989986Sjhay rclk = DEFAULT_RCLK; 94089986Sjhay com->rclk = rclk; 94189986Sjhay 942136478Sphk if (unit == comconsole) 943136450Sphk ttyconsolemode(tp, comdefaultrate); 944136478Sphk error = siosetwater(com, tp->t_init_in.c_ispeed); 945136478Sphk mtx_unlock_spin(&sio_lock); 946136478Sphk if (error) { 94756788Sbde /* 94856788Sbde * Leave i/o resources allocated if this is a `cn'-level 94956788Sbde * console, so that other devices can't snarf them. 95056788Sbde */ 95156788Sbde if (iobase != siocniobase) 95256788Sbde bus_release_resource(dev, SYS_RES_IOPORT, rid, port); 95356788Sbde return (ENOMEM); 95451078Speter } 95551078Speter 95651078Speter /* attempt to determine UART type */ 95751078Speter printf("sio%d: type", unit); 95851078Speter 959104067Sphk if (!COM_ISMULTIPORT(flags) && 960104067Sphk !COM_IIR_TXRDYBUG(flags) && !COM_NOSCR(flags)) { 96151078Speter u_char scr; 96251078Speter u_char scr1; 96351078Speter u_char scr2; 96451078Speter 96560471Snyan scr = sio_getreg(com, com_scr); 96660471Snyan sio_setreg(com, com_scr, 0xa5); 96760471Snyan scr1 = sio_getreg(com, com_scr); 96860471Snyan sio_setreg(com, com_scr, 0x5a); 96960471Snyan scr2 = sio_getreg(com, com_scr); 97060471Snyan sio_setreg(com, com_scr, scr); 97151078Speter if (scr1 != 0xa5 || scr2 != 0x5a) { 97289447Sbmah printf(" 8250 or not responding"); 97351078Speter goto determined_type; 97451078Speter } 97551078Speter } 97660471Snyan sio_setreg(com, com_fifo, FIFO_ENABLE | FIFO_RX_HIGH); 97751078Speter DELAY(100); 97851078Speter switch (inb(com->int_id_port) & IIR_FIFO_MASK) { 97951078Speter case FIFO_RX_LOW: 98051078Speter printf(" 16450"); 98151078Speter break; 98251078Speter case FIFO_RX_MEDL: 98351078Speter printf(" 16450?"); 98451078Speter break; 98551078Speter case FIFO_RX_MEDH: 98651078Speter printf(" 16550?"); 98751078Speter break; 98851078Speter case FIFO_RX_HIGH: 98951078Speter if (COM_NOFIFO(flags)) { 99051078Speter printf(" 16550A fifo disabled"); 991120173Sbde break; 99251078Speter } 993120173Sbde com->hasfifo = TRUE; 994120173Sbde if (COM_ST16650A(flags)) { 995120173Sbde printf(" ST16650A"); 996120173Sbde com->st16650a = TRUE; 997120173Sbde com->tx_fifo_size = 32; 998120173Sbde break; 999120173Sbde } 1000120173Sbde if (COM_TI16754(flags)) { 1001120173Sbde printf(" TI16754"); 1002120173Sbde com->tx_fifo_size = 64; 1003120173Sbde break; 1004120173Sbde } 1005120173Sbde printf(" 16550A"); 100651078Speter#ifdef COM_ESP 100751078Speter for (espp = likely_esp_ports; *espp != 0; espp++) 100851078Speter if (espattach(com, *espp)) { 100951078Speter com->tx_fifo_size = 1024; 101051078Speter break; 101151078Speter } 1012123796Sbde if (com->esp) 1013120173Sbde break; 101451078Speter#endif 1015120173Sbde com->tx_fifo_size = COM_FIFOSIZE(flags); 1016120173Sbde if (com->tx_fifo_size == 0) 1017120173Sbde com->tx_fifo_size = 16; 1018120173Sbde else 1019120173Sbde printf(" lookalike with %u bytes FIFO", 1020120173Sbde com->tx_fifo_size); 102151078Speter break; 102251078Speter } 102351078Speter#ifdef COM_ESP 1024123796Sbde if (com->esp) { 102551078Speter /* 102651078Speter * Set 16550 compatibility mode. 102751078Speter * We don't use the ESP_MODE_SCALE bit to increase the 102851078Speter * fifo trigger levels because we can't handle large 102951078Speter * bursts of input. 103051078Speter * XXX flow control should be set in comparam(), not here. 103151078Speter */ 103251078Speter outb(com->esp_port + ESP_CMD1, ESP_SETMODE); 103351078Speter outb(com->esp_port + ESP_CMD2, ESP_MODE_RTS | ESP_MODE_FIFO); 103451078Speter 103551078Speter /* Set RTS/CTS flow control. */ 103651078Speter outb(com->esp_port + ESP_CMD1, ESP_SETFLOWTYPE); 103751078Speter outb(com->esp_port + ESP_CMD2, ESP_FLOW_RTS); 103851078Speter outb(com->esp_port + ESP_CMD2, ESP_FLOW_CTS); 103951078Speter 104051078Speter /* Set flow-control levels. */ 104151078Speter outb(com->esp_port + ESP_CMD1, ESP_SETRXFLOW); 104251078Speter outb(com->esp_port + ESP_CMD2, HIBYTE(768)); 104351078Speter outb(com->esp_port + ESP_CMD2, LOBYTE(768)); 104451078Speter outb(com->esp_port + ESP_CMD2, HIBYTE(512)); 104551078Speter outb(com->esp_port + ESP_CMD2, LOBYTE(512)); 104651078Speter } 104751078Speter#endif /* COM_ESP */ 104860471Snyan sio_setreg(com, com_fifo, 0); 104951078Speterdetermined_type: ; 105051078Speter 105151078Speter#ifdef COM_MULTIPORT 105251078Speter if (COM_ISMULTIPORT(flags)) { 105353344Speter device_t masterdev; 105453344Speter 105551078Speter com->multiport = TRUE; 105651078Speter printf(" (multiport"); 105751078Speter if (unit == COM_MPMASTER(flags)) 105851078Speter printf(" master"); 105951078Speter printf(")"); 106053344Speter masterdev = devclass_get_device(sio_devclass, 106153344Speter COM_MPMASTER(flags)); 106257234Sbde com->no_irq = (masterdev == NULL || bus_get_resource(masterdev, 106357234Sbde SYS_RES_IRQ, 0, NULL, NULL) != 0); 106451078Speter } 106551078Speter#endif /* COM_MULTIPORT */ 106651078Speter if (unit == comconsole) 106751078Speter printf(", console"); 106853344Speter if (COM_IIR_TXRDYBUG(flags)) 1069120189Sbde printf(" with a buggy IIR_TXRDY implementation"); 107051078Speter printf("\n"); 107151078Speter 107267551Sjhb if (sio_fast_ih == NULL) { 1073151658Sjhb swi_add(&tty_intr_event, "sio", siopoll, NULL, SWI_TTY, 0, 107472238Sjhb &sio_fast_ih); 1075151658Sjhb swi_add(&clk_intr_event, "sio", siopoll, NULL, SWI_CLOCK, 0, 107672238Sjhb &sio_slow_ih); 107751078Speter } 1078136478Sphk 107951078Speter com->flags = flags; 108051078Speter com->pps.ppscap = PPS_CAPTUREASSERT | PPS_CAPTURECLEAR; 1081136478Sphk tp->t_pps = &com->pps; 1082111613Sphk 1083111613Sphk if (COM_PPSCTS(flags)) 1084111613Sphk com->pps_bit = MSR_CTS; 1085111613Sphk else 1086111613Sphk com->pps_bit = MSR_DCD; 108751078Speter pps_init(&com->pps); 108851078Speter 108951078Speter rid = 0; 1090127135Snjl com->irqres = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid, RF_ACTIVE); 109153344Speter if (com->irqres) { 1092155921Sjhb ret = bus_setup_intr(dev, com->irqres, 1093166901Spiso INTR_TYPE_TTY, 1094166901Spiso siointr, NULL, com, 1095166901Spiso &com->cookie); 109654194Speter if (ret) { 1097155921Sjhb ret = bus_setup_intr(dev, 109854194Speter com->irqres, INTR_TYPE_TTY, 1099166901Spiso NULL, (driver_intr_t *)siointr, com, &com->cookie); 110054194Speter if (ret == 0) 110183246Sdd device_printf(dev, "unable to activate interrupt in fast mode - using normal mode\n"); 110254194Speter } 110353344Speter if (ret) 110453344Speter device_printf(dev, "could not activate interrupt\n"); 1105131939Smarcel#if defined(KDB) && (defined(BREAK_TO_DEBUGGER) || \ 1106127157Snjl defined(ALT_BREAK_TO_DEBUGGER)) 110778504Siedowse /* 110878504Siedowse * Enable interrupts for early break-to-debugger support 1109127157Snjl * on the console. 111078504Siedowse */ 1111127157Snjl if (ret == 0 && unit == comconsole) 111278504Siedowse outb(siocniobase + com_ier, IER_ERXRDY | IER_ERLS | 111378504Siedowse IER_EMSC); 111478504Siedowse#endif 111553344Speter } 111651078Speter 1117136478Sphk /* We're ready, open the doors... */ 1118151383Sphk ttycreate(tp, TS_CALLOUT, "d%r", unit); 111951078Speter 1120130872Sphk return (0); 1121130872Sphk} 1122130872Sphk 1123130872Sphkstatic int 1124136478Sphkcomopen(struct tty *tp, struct cdev *dev) 112551078Speter{ 112651078Speter struct com_s *com; 1127136478Sphk int i; 112851078Speter 1129136478Sphk com = tp->t_sc; 1130136478Sphk com->poll = com->no_irq; 1131136478Sphk com->poll_output = com->loses_outints; 1132136478Sphk if (com->hasfifo) { 113351078Speter /* 1134136478Sphk * (Re)enable and drain fifos. 1135136478Sphk * 1136136478Sphk * Certain SMC chips cause problems if the fifos 1137136478Sphk * are enabled while input is ready. Turn off the 1138136478Sphk * fifo if necessary to clear the input. We test 1139136478Sphk * the input ready bit after enabling the fifos 1140136478Sphk * since we've already enabled them in comparam() 1141136478Sphk * and to handle races between enabling and fresh 1142136478Sphk * input. 114351078Speter */ 1144136478Sphk for (i = 0; i < 500; i++) { 1145136478Sphk sio_setreg(com, com_fifo, 1146136478Sphk FIFO_RCV_RST | FIFO_XMT_RST 1147136478Sphk | com->fifo_image); 114851078Speter /* 1149136478Sphk * XXX the delays are for superstitious 1150136478Sphk * historical reasons. It must be less than 1151136478Sphk * the character time at the maximum 1152136478Sphk * supported speed (87 usec at 115200 bps 1153136478Sphk * 8N1). Otherwise we might loop endlessly 1154136478Sphk * if data is streaming in. We used to use 1155136478Sphk * delays of 100. That usually worked 1156136478Sphk * because DELAY(100) used to usually delay 1157136478Sphk * for about 85 usec instead of 100. 115851078Speter */ 1159136478Sphk DELAY(50); 1160136478Sphk if (!(inb(com->line_status_port) & LSR_RXRDY)) 1161136478Sphk break; 1162136478Sphk sio_setreg(com, com_fifo, 0); 1163136478Sphk DELAY(50); 1164136478Sphk (void) inb(com->data_port); 116551078Speter } 1166136478Sphk if (i == 500) 1167136478Sphk return (EIO); 116851078Speter } 116951078Speter 1170136478Sphk mtx_lock_spin(&sio_lock); 1171136478Sphk (void) inb(com->line_status_port); 1172136478Sphk (void) inb(com->data_port); 1173136478Sphk com->prev_modem_status = com->last_modem_status 1174136478Sphk = inb(com->modem_status_port); 1175136478Sphk outb(com->int_ctl_port, 1176136478Sphk IER_ERXRDY | IER_ERLS | IER_EMSC 1177136478Sphk | (COM_IIR_TXRDYBUG(com->flags) ? 0 : IER_ETXRDY)); 1178136478Sphk mtx_unlock_spin(&sio_lock); 117951078Speter siosettimeout(); 1180136478Sphk /* XXX: should be generic ? */ 1181136478Sphk if (com->prev_modem_status & MSR_DCD || ISCALLOUT(dev)) 1182136478Sphk ttyld_modem(tp, 1); 118351078Speter return (0); 118451078Speter} 118551078Speter 118651078Speterstatic void 1187136478Sphkcomclose(tp) 1188136478Sphk struct tty *tp; 118951078Speter{ 119051078Speter int s; 1191136478Sphk struct com_s *com; 119251078Speter 119351078Speter s = spltty(); 1194136478Sphk com = tp->t_sc; 119551078Speter com->poll = FALSE; 119651078Speter com->poll_output = FALSE; 119760471Snyan sio_setreg(com, com_cfcr, com->cfcr_image &= ~CFCR_SBREAK); 119878504Siedowse 1199131939Smarcel#if defined(KDB) && (defined(BREAK_TO_DEBUGGER) || \ 1200127157Snjl defined(ALT_BREAK_TO_DEBUGGER)) 120178504Siedowse /* 120278504Siedowse * Leave interrupts enabled and don't clear DTR if this is the 120378504Siedowse * console. This allows us to detect break-to-debugger events 120478504Siedowse * while the console device is closed. 120578504Siedowse */ 1206127157Snjl if (com->unit != comconsole) 120778504Siedowse#endif 120851078Speter { 120960471Snyan sio_setreg(com, com_ier, 0); 121051078Speter if (tp->t_cflag & HUPCL 121151078Speter /* 121251078Speter * XXX we will miss any carrier drop between here and the 121351078Speter * next open. Perhaps we should watch DCD even when the 121451078Speter * port is closed; it is not sufficient to check it at 121551078Speter * the next open because it might go up and down while 121651078Speter * we're not watching. 121751078Speter */ 1218136478Sphk || (!tp->t_actout 121951078Speter && !(com->prev_modem_status & MSR_DCD) 1220135329Sphk && !(tp->t_init_in.c_cflag & CLOCAL)) 122151078Speter || !(tp->t_state & TS_ISOPEN)) { 1222131094Sphk (void)commodem(tp, 0, SER_DTR); 1223131981Sphk ttydtrwaitstart(tp); 122451078Speter } 122551078Speter } 122651078Speter if (com->hasfifo) { 122751078Speter /* 122851078Speter * Disable fifos so that they are off after controlled 122951078Speter * reboots. Some BIOSes fail to detect 16550s when the 123051078Speter * fifos are enabled. 123151078Speter */ 123260471Snyan sio_setreg(com, com_fifo, 0); 123351078Speter } 1234136478Sphk tp->t_actout = FALSE; 1235136478Sphk wakeup(&tp->t_actout); 123651078Speter wakeup(TSA_CARR_ON(tp)); /* restart any wopeners */ 1237136478Sphk siosettimeout(); 123851078Speter splx(s); 123951078Speter} 124051078Speter 124151078Speterstatic void 124251078Spetersiobusycheck(chan) 124351078Speter void *chan; 124451078Speter{ 124551078Speter struct com_s *com; 124651078Speter int s; 124751078Speter 124851078Speter com = (struct com_s *)chan; 124951078Speter 125051078Speter /* 125151078Speter * Clear TS_BUSY if low-level output is complete. 125251078Speter * spl locking is sufficient because siointr1() does not set CS_BUSY. 125351078Speter * If siointr1() clears CS_BUSY after we look at it, then we'll get 125451078Speter * called again. Reading the line status port outside of siointr1() 125551078Speter * is safe because CS_BUSY is clear so there are no output interrupts 125651078Speter * to lose. 125751078Speter */ 125851078Speter s = spltty(); 125951078Speter if (com->state & CS_BUSY) 126051078Speter com->extra_state &= ~CSE_BUSYCHECK; /* False alarm. */ 126151078Speter else if ((inb(com->line_status_port) & (LSR_TSRE | LSR_TXRDY)) 126251078Speter == (LSR_TSRE | LSR_TXRDY)) { 126351078Speter com->tp->t_state &= ~TS_BUSY; 126451078Speter ttwwakeup(com->tp); 126551078Speter com->extra_state &= ~CSE_BUSYCHECK; 126651078Speter } else 126751078Speter timeout(siobusycheck, com, hz / 100); 126851078Speter splx(s); 126951078Speter} 127051078Speter 127189986Sjhaystatic u_int 127289986Sjhaysiodivisor(rclk, speed) 127389986Sjhay u_long rclk; 127489986Sjhay speed_t speed; 127589986Sjhay{ 127689986Sjhay long actual_speed; 127789986Sjhay u_int divisor; 127889986Sjhay int error; 127989986Sjhay 1280114334Speter if (speed == 0) 128189986Sjhay return (0); 1282114334Speter#if UINT_MAX > (ULONG_MAX - 1) / 8 1283114334Speter if (speed > (ULONG_MAX - 1) / 8) 1284114334Speter return (0); 1285114334Speter#endif 128689986Sjhay divisor = (rclk / (8UL * speed) + 1) / 2; 128789986Sjhay if (divisor == 0 || divisor >= 65536) 128889986Sjhay return (0); 128989986Sjhay actual_speed = rclk / (16UL * divisor); 129089986Sjhay 129189986Sjhay /* 10 times error in percent: */ 129289986Sjhay error = ((actual_speed - (long)speed) * 2000 / (long)speed + 1) / 2; 129389986Sjhay 129489986Sjhay /* 3.0% maximum error tolerance: */ 129589986Sjhay if (error < -30 || error > 30) 129689986Sjhay return (0); 129789986Sjhay 129889986Sjhay return (divisor); 129989986Sjhay} 130089986Sjhay 130165557Sjasone/* 130270174Sjhb * Call this function with the sio_lock mutex held. It will return with the 130370174Sjhb * lock still held. 130465557Sjasone */ 130551078Speterstatic void 130651078Spetersioinput(com) 130751078Speter struct com_s *com; 130851078Speter{ 130951078Speter u_char *buf; 131051078Speter int incc; 131151078Speter u_char line_status; 131251078Speter int recv_data; 131351078Speter struct tty *tp; 131451078Speter 131551078Speter buf = com->ibuf; 131651078Speter tp = com->tp; 131751078Speter if (!(tp->t_state & TS_ISOPEN) || !(tp->t_cflag & CREAD)) { 131851078Speter com_events -= (com->iptr - com->ibuf); 131951078Speter com->iptr = com->ibuf; 132051078Speter return; 132151078Speter } 132251078Speter if (tp->t_state & TS_CAN_BYPASS_L_RINT) { 132351078Speter /* 132451078Speter * Avoid the grotesquely inefficient lineswitch routine 132551078Speter * (ttyinput) in "raw" mode. It usually takes about 450 132651078Speter * instructions (that's without canonical processing or echo!). 132751078Speter * slinput is reasonably fast (usually 40 instructions plus 132851078Speter * call overhead). 132951078Speter */ 133051078Speter do { 133165557Sjasone /* 133265557Sjasone * This may look odd, but it is using save-and-enable 133365557Sjasone * semantics instead of the save-and-disable semantics 133465557Sjasone * that are used everywhere else. 133565557Sjasone */ 133672200Sbmilekic mtx_unlock_spin(&sio_lock); 133751078Speter incc = com->iptr - buf; 133851078Speter if (tp->t_rawq.c_cc + incc > tp->t_ihiwat 133951078Speter && (com->state & CS_RTS_IFLOW 134051078Speter || tp->t_iflag & IXOFF) 134151078Speter && !(tp->t_state & TS_TBLOCK)) 134251078Speter ttyblock(tp); 134351078Speter com->delta_error_counts[CE_TTY_BUF_OVERFLOW] 134451078Speter += b_to_q((char *)buf, incc, &tp->t_rawq); 134551078Speter buf += incc; 134651078Speter tk_nin += incc; 134751078Speter tk_rawcc += incc; 134851078Speter tp->t_rawcc += incc; 134951078Speter ttwakeup(tp); 135051078Speter if (tp->t_state & TS_TTSTOP 135151078Speter && (tp->t_iflag & IXANY 135251078Speter || tp->t_cc[VSTART] == tp->t_cc[VSTOP])) { 135351078Speter tp->t_state &= ~TS_TTSTOP; 135451078Speter tp->t_lflag &= ~FLUSHO; 135551078Speter comstart(tp); 135651078Speter } 135772200Sbmilekic mtx_lock_spin(&sio_lock); 135851078Speter } while (buf < com->iptr); 135951078Speter } else { 136051078Speter do { 136165557Sjasone /* 136265557Sjasone * This may look odd, but it is using save-and-enable 136365557Sjasone * semantics instead of the save-and-disable semantics 136465557Sjasone * that are used everywhere else. 136565557Sjasone */ 136672200Sbmilekic mtx_unlock_spin(&sio_lock); 136751078Speter line_status = buf[com->ierroff]; 136851078Speter recv_data = *buf++; 136951078Speter if (line_status 137051078Speter & (LSR_BI | LSR_FE | LSR_OE | LSR_PE)) { 137151078Speter if (line_status & LSR_BI) 137251078Speter recv_data |= TTY_BI; 137351078Speter if (line_status & LSR_FE) 137451078Speter recv_data |= TTY_FE; 137551078Speter if (line_status & LSR_OE) 137651078Speter recv_data |= TTY_OE; 137751078Speter if (line_status & LSR_PE) 137851078Speter recv_data |= TTY_PE; 137951078Speter } 1380130077Sphk ttyld_rint(tp, recv_data); 138172200Sbmilekic mtx_lock_spin(&sio_lock); 138251078Speter } while (buf < com->iptr); 138351078Speter } 138451078Speter com_events -= (com->iptr - com->ibuf); 138551078Speter com->iptr = com->ibuf; 138651078Speter 138751078Speter /* 138851078Speter * There is now room for another low-level buffer full of input, 138951078Speter * so enable RTS if it is now disabled and there is room in the 139051078Speter * high-level buffer. 139151078Speter */ 139251078Speter if ((com->state & CS_RTS_IFLOW) && !(com->mcr_image & MCR_RTS) && 139351078Speter !(tp->t_state & TS_TBLOCK)) 139451078Speter outb(com->modem_ctl_port, com->mcr_image |= MCR_RTS); 139551078Speter} 139651078Speter 1397166901Spisostatic int 139851078Spetersiointr(arg) 139951078Speter void *arg; 140051078Speter{ 140170174Sjhb struct com_s *com; 140270174Sjhb 140351078Speter#ifndef COM_MULTIPORT 140470174Sjhb com = (struct com_s *)arg; 140570174Sjhb 140672200Sbmilekic mtx_lock_spin(&sio_lock); 140770174Sjhb siointr1(com); 140872200Sbmilekic mtx_unlock_spin(&sio_lock); 140951078Speter#else /* COM_MULTIPORT */ 141051078Speter bool_t possibly_more_intrs; 141151078Speter int unit; 141251078Speter 141351078Speter /* 141451078Speter * Loop until there is no activity on any port. This is necessary 141551078Speter * to get an interrupt edge more than to avoid another interrupt. 141651078Speter * If the IRQ signal is just an OR of the IRQ signals from several 141751078Speter * devices, then the edge from one may be lost because another is 141851078Speter * on. 141951078Speter */ 142072200Sbmilekic mtx_lock_spin(&sio_lock); 142151078Speter do { 142251078Speter possibly_more_intrs = FALSE; 142353344Speter for (unit = 0; unit < sio_numunits; ++unit) { 142451078Speter com = com_addr(unit); 142551078Speter /* 142651078Speter * XXX COM_LOCK(); 142751078Speter * would it work here, or be counter-productive? 142851078Speter */ 142951078Speter if (com != NULL 143051078Speter && !com->gone 143151078Speter && (inb(com->int_id_port) & IIR_IMASK) 143251078Speter != IIR_NOPEND) { 143351078Speter siointr1(com); 143451078Speter possibly_more_intrs = TRUE; 143551078Speter } 143651078Speter /* XXX COM_UNLOCK(); */ 143751078Speter } 143851078Speter } while (possibly_more_intrs); 143972200Sbmilekic mtx_unlock_spin(&sio_lock); 144051078Speter#endif /* COM_MULTIPORT */ 1441166901Spiso return(FILTER_HANDLED); 144251078Speter} 144351078Speter 1444122819Sbdestatic struct timespec siots[8]; 144593466Sbdestatic int siotso; 144693466Sbdestatic int volatile siotsunit = -1; 144793466Sbde 144893466Sbdestatic int 144993466Sbdesysctl_siots(SYSCTL_HANDLER_ARGS) 145093466Sbde{ 145193466Sbde char buf[128]; 145293466Sbde long long delta; 145393466Sbde size_t len; 1454122819Sbde int error, i, tso; 145593466Sbde 1456122819Sbde for (i = 1, tso = siotso; i < tso; i++) { 145793466Sbde delta = (long long)(siots[i].tv_sec - siots[i - 1].tv_sec) * 145893466Sbde 1000000000 + 145993466Sbde (siots[i].tv_nsec - siots[i - 1].tv_nsec); 146093466Sbde len = sprintf(buf, "%lld\n", delta); 146193466Sbde if (delta >= 110000) 146293466Sbde len += sprintf(buf + len - 1, ": *** %ld.%09ld\n", 1463122819Sbde (long)siots[i].tv_sec, siots[i].tv_nsec) - 1; 1464122819Sbde if (i == tso - 1) 146593466Sbde buf[len - 1] = '\0'; 146693466Sbde error = SYSCTL_OUT(req, buf, len); 146793466Sbde if (error != 0) 146893466Sbde return (error); 146993466Sbde uio_yield(); 147093466Sbde } 147193466Sbde return (0); 147293466Sbde} 147393466Sbde 147493466SbdeSYSCTL_PROC(_machdep, OID_AUTO, siots, CTLTYPE_STRING | CTLFLAG_RD, 147593466Sbde 0, 0, sysctl_siots, "A", "sio timestamps"); 147693466Sbde 147751078Speterstatic void 147851078Spetersiointr1(com) 147951078Speter struct com_s *com; 148051078Speter{ 1481120189Sbde u_char int_ctl; 1482120189Sbde u_char int_ctl_new; 148351078Speter u_char line_status; 148451078Speter u_char modem_status; 148551078Speter u_char *ioptr; 148651078Speter u_char recv_data; 1487178766Speter#if defined(KDB) && defined(ALT_BREAK_TO_DEBUGGER) 1488178766Speter int kdb_brk; 148951078Speter 1490178766Speteragain: 1491178766Speter#endif 1492178766Speter 1493120091Sbde if (COM_IIR_TXRDYBUG(com->flags)) { 1494120189Sbde int_ctl = inb(com->int_ctl_port); 1495120091Sbde int_ctl_new = int_ctl; 1496120091Sbde } else { 1497120091Sbde int_ctl = 0; 1498120091Sbde int_ctl_new = 0; 1499120091Sbde } 150051078Speter 150151078Speter while (!com->gone) { 150251078Speter if (com->pps.ppsparam.mode & PPS_CAPTUREBOTH) { 150351078Speter modem_status = inb(com->modem_status_port); 1504111613Sphk if ((modem_status ^ com->last_modem_status) & 1505111613Sphk com->pps_bit) { 150695523Sphk pps_capture(&com->pps); 1507111613Sphk pps_event(&com->pps, 1508111616Sphk (modem_status & com->pps_bit) ? 150951078Speter PPS_CAPTUREASSERT : PPS_CAPTURECLEAR); 151051078Speter } 151151078Speter } 151251078Speter line_status = inb(com->line_status_port); 1513128020Simp 151451078Speter /* input event? (check first to help avoid overruns) */ 151551078Speter while (line_status & LSR_RCV_MASK) { 151651078Speter /* break/unnattached error bits or real input? */ 151751078Speter if (!(line_status & LSR_RXRDY)) 151851078Speter recv_data = 0; 151951078Speter else 152051078Speter recv_data = inb(com->data_port); 1521131939Smarcel#ifdef KDB 1522119485Snjl#ifdef ALT_BREAK_TO_DEBUGGER 1523119485Snjl if (com->unit == comconsole && 1524178766Speter (kdb_brk = kdb_alt_break(recv_data, 1525178766Speter &com->alt_brk_state)) != 0) { 1526178766Speter mtx_unlock_spin(&sio_lock); 1527178766Speter switch (kdb_brk) { 1528178766Speter case KDB_REQ_DEBUGGER: 1529178766Speter kdb_enter(KDB_WHY_BREAK, 1530178766Speter "Break sequence on console"); 1531178766Speter break; 1532178766Speter case KDB_REQ_PANIC: 1533178766Speter kdb_panic("panic on console"); 1534178766Speter break; 1535178766Speter case KDB_REQ_REBOOT: 1536178766Speter kdb_reboot(); 1537178766Speter break; 1538178766Speter } 1539178766Speter mtx_lock_spin(&sio_lock); 1540178766Speter goto again; 1541178766Speter } 1542119485Snjl#endif /* ALT_BREAK_TO_DEBUGGER */ 1543131939Smarcel#endif /* KDB */ 154451078Speter if (line_status & (LSR_BI | LSR_FE | LSR_PE)) { 154551078Speter /* 154651078Speter * Don't store BI if IGNBRK or FE/PE if IGNPAR. 154751078Speter * Otherwise, push the work to a higher level 154851078Speter * (to handle PARMRK) if we're bypassing. 154951078Speter * Otherwise, convert BI/FE and PE+INPCK to 0. 155051078Speter * 155151078Speter * This makes bypassing work right in the 155251078Speter * usual "raw" case (IGNBRK set, and IGNPAR 155351078Speter * and INPCK clear). 155451078Speter * 155551078Speter * Note: BI together with FE/PE means just BI. 155651078Speter */ 155751078Speter if (line_status & LSR_BI) { 1558131939Smarcel#if defined(KDB) && defined(BREAK_TO_DEBUGGER) 155951078Speter if (com->unit == comconsole) { 1560174898Srwatson kdb_enter(KDB_WHY_BREAK, 1561174898Srwatson "Line break on console"); 156251078Speter goto cont; 156351078Speter } 156451078Speter#endif 156551078Speter if (com->tp == NULL 156651078Speter || com->tp->t_iflag & IGNBRK) 156751078Speter goto cont; 156851078Speter } else { 156951078Speter if (com->tp == NULL 157051078Speter || com->tp->t_iflag & IGNPAR) 157151078Speter goto cont; 157251078Speter } 157351078Speter if (com->tp->t_state & TS_CAN_BYPASS_L_RINT 157451078Speter && (line_status & (LSR_BI | LSR_FE) 157551078Speter || com->tp->t_iflag & INPCK)) 157651078Speter recv_data = 0; 157751078Speter } 157851078Speter ++com->bytes_in; 1579131185Sphk if (com->tp != NULL && 1580131185Sphk com->tp->t_hotchar != 0 && recv_data == com->tp->t_hotchar) 158188900Sjhb swi_sched(sio_fast_ih, 0); 158251078Speter ioptr = com->iptr; 158351078Speter if (ioptr >= com->ibufend) 158451078Speter CE_RECORD(com, CE_INTERRUPT_BUF_OVERFLOW); 158551078Speter else { 1586136478Sphk if (com->tp != NULL && com->tp->t_do_timestamp) 1587136478Sphk microtime(&com->tp->t_timestamp); 158851078Speter ++com_events; 158972238Sjhb swi_sched(sio_slow_ih, SWI_DELAY); 159051078Speter#if 0 /* for testing input latency vs efficiency */ 159151078Speterif (com->iptr - com->ibuf == 8) 159288900Sjhb swi_sched(sio_fast_ih, 0); 159351078Speter#endif 159451078Speter ioptr[0] = recv_data; 159551078Speter ioptr[com->ierroff] = line_status; 159651078Speter com->iptr = ++ioptr; 159751078Speter if (ioptr == com->ihighwater 159851078Speter && com->state & CS_RTS_IFLOW) 159951078Speter outb(com->modem_ctl_port, 160051078Speter com->mcr_image &= ~MCR_RTS); 160151078Speter if (line_status & LSR_OE) 160251078Speter CE_RECORD(com, CE_OVERRUN); 160351078Speter } 160451078Spetercont: 1605122844Sbde if (line_status & LSR_TXRDY 1606122844Sbde && com->state >= (CS_BUSY | CS_TTGO | CS_ODEVREADY)) 1607122844Sbde goto txrdy; 1608122844Sbde 160951078Speter /* 161051078Speter * "& 0x7F" is to avoid the gcc-1.40 generating a slow 161151078Speter * jump from the top of the loop to here 161251078Speter */ 161351078Speter line_status = inb(com->line_status_port) & 0x7F; 161451078Speter } 161551078Speter 161651078Speter /* modem status change? (always check before doing output) */ 161751078Speter modem_status = inb(com->modem_status_port); 161851078Speter if (modem_status != com->last_modem_status) { 161951078Speter /* 162051078Speter * Schedule high level to handle DCD changes. Note 162151078Speter * that we don't use the delta bits anywhere. Some 162251078Speter * UARTs mess them up, and it's easy to remember the 162351078Speter * previous bits and calculate the delta. 162451078Speter */ 162551078Speter com->last_modem_status = modem_status; 162651078Speter if (!(com->state & CS_CHECKMSR)) { 162751078Speter com_events += LOTS_OF_EVENTS; 162851078Speter com->state |= CS_CHECKMSR; 162988900Sjhb swi_sched(sio_fast_ih, 0); 163051078Speter } 163151078Speter 163251078Speter /* handle CTS change immediately for crisp flow ctl */ 163351078Speter if (com->state & CS_CTS_OFLOW) { 163451078Speter if (modem_status & MSR_CTS) 163551078Speter com->state |= CS_ODEVREADY; 163651078Speter else 163751078Speter com->state &= ~CS_ODEVREADY; 163851078Speter } 163951078Speter } 164051078Speter 1641122844Sbdetxrdy: 164251078Speter /* output queued and everything ready? */ 164351078Speter if (line_status & LSR_TXRDY 164451078Speter && com->state >= (CS_BUSY | CS_TTGO | CS_ODEVREADY)) { 164551078Speter ioptr = com->obufq.l_head; 164693466Sbde if (com->tx_fifo_size > 1 && com->unit != siotsunit) { 164751078Speter u_int ocount; 164851078Speter 164951078Speter ocount = com->obufq.l_tail - ioptr; 165051078Speter if (ocount > com->tx_fifo_size) 165151078Speter ocount = com->tx_fifo_size; 165251078Speter com->bytes_out += ocount; 165351078Speter do 165451078Speter outb(com->data_port, *ioptr++); 165551078Speter while (--ocount != 0); 165651078Speter } else { 165751078Speter outb(com->data_port, *ioptr++); 165851078Speter ++com->bytes_out; 1659122819Sbde if (com->unit == siotsunit 1660122819Sbde && siotso < sizeof siots / sizeof siots[0]) 1661122819Sbde nanouptime(&siots[siotso++]); 166251078Speter } 166351078Speter com->obufq.l_head = ioptr; 1664120189Sbde if (COM_IIR_TXRDYBUG(com->flags)) 166551078Speter int_ctl_new = int_ctl | IER_ETXRDY; 166651078Speter if (ioptr >= com->obufq.l_tail) { 166751078Speter struct lbq *qp; 166851078Speter 166951078Speter qp = com->obufq.l_next; 167051078Speter qp->l_queued = FALSE; 167151078Speter qp = qp->l_next; 167251078Speter if (qp != NULL) { 167351078Speter com->obufq.l_head = qp->l_head; 167451078Speter com->obufq.l_tail = qp->l_tail; 167551078Speter com->obufq.l_next = qp; 167651078Speter } else { 167751078Speter /* output just completed */ 1678120189Sbde if (COM_IIR_TXRDYBUG(com->flags)) 1679120189Sbde int_ctl_new = int_ctl 1680120189Sbde & ~IER_ETXRDY; 168151078Speter com->state &= ~CS_BUSY; 168251078Speter } 168351078Speter if (!(com->state & CS_ODONE)) { 168451078Speter com_events += LOTS_OF_EVENTS; 168551078Speter com->state |= CS_ODONE; 168667551Sjhb /* handle at high level ASAP */ 168788900Sjhb swi_sched(sio_fast_ih, 0); 168851078Speter } 168951078Speter } 1690120189Sbde if (COM_IIR_TXRDYBUG(com->flags) 1691120189Sbde && int_ctl != int_ctl_new) 1692120189Sbde outb(com->int_ctl_port, int_ctl_new); 169351078Speter } 169451078Speter 169551078Speter /* finished? */ 169651078Speter#ifndef COM_MULTIPORT 169751078Speter if ((inb(com->int_id_port) & IIR_IMASK) == IIR_NOPEND) 169851078Speter#endif /* COM_MULTIPORT */ 169951078Speter return; 170051078Speter } 170151078Speter} 170251078Speter 170365557Sjasone/* software interrupt handler for SWI_TTY */ 170451078Speterstatic void 170567551Sjhbsiopoll(void *dummy) 170651078Speter{ 170751078Speter int unit; 170851078Speter 170951078Speter if (com_events == 0) 171051078Speter return; 171151078Speterrepeat: 171253344Speter for (unit = 0; unit < sio_numunits; ++unit) { 171351078Speter struct com_s *com; 171451078Speter int incc; 171551078Speter struct tty *tp; 171651078Speter 171751078Speter com = com_addr(unit); 171851078Speter if (com == NULL) 171951078Speter continue; 172051078Speter tp = com->tp; 172151078Speter if (tp == NULL || com->gone) { 172251078Speter /* 172351078Speter * Discard any events related to never-opened or 172451078Speter * going-away devices. 172551078Speter */ 172672200Sbmilekic mtx_lock_spin(&sio_lock); 172751078Speter incc = com->iptr - com->ibuf; 172851078Speter com->iptr = com->ibuf; 172951078Speter if (com->state & CS_CHECKMSR) { 173051078Speter incc += LOTS_OF_EVENTS; 173151078Speter com->state &= ~CS_CHECKMSR; 173251078Speter } 173351078Speter com_events -= incc; 173472200Sbmilekic mtx_unlock_spin(&sio_lock); 173551078Speter continue; 173651078Speter } 173751078Speter if (com->iptr != com->ibuf) { 173872200Sbmilekic mtx_lock_spin(&sio_lock); 173951078Speter sioinput(com); 174072200Sbmilekic mtx_unlock_spin(&sio_lock); 174151078Speter } 174251078Speter if (com->state & CS_CHECKMSR) { 174351078Speter u_char delta_modem_status; 174451078Speter 174572200Sbmilekic mtx_lock_spin(&sio_lock); 174651078Speter delta_modem_status = com->last_modem_status 174751078Speter ^ com->prev_modem_status; 174851078Speter com->prev_modem_status = com->last_modem_status; 174951078Speter com_events -= LOTS_OF_EVENTS; 175051078Speter com->state &= ~CS_CHECKMSR; 175172200Sbmilekic mtx_unlock_spin(&sio_lock); 175251078Speter if (delta_modem_status & MSR_DCD) 1753130095Sphk ttyld_modem(tp, 1754130095Sphk com->prev_modem_status & MSR_DCD); 175551078Speter } 175651078Speter if (com->state & CS_ODONE) { 175772200Sbmilekic mtx_lock_spin(&sio_lock); 175851078Speter com_events -= LOTS_OF_EVENTS; 175951078Speter com->state &= ~CS_ODONE; 176072200Sbmilekic mtx_unlock_spin(&sio_lock); 176151078Speter if (!(com->state & CS_BUSY) 176251078Speter && !(com->extra_state & CSE_BUSYCHECK)) { 176351078Speter timeout(siobusycheck, com, hz / 100); 176451078Speter com->extra_state |= CSE_BUSYCHECK; 176551078Speter } 1766130077Sphk ttyld_start(tp); 176751078Speter } 176851078Speter if (com_events == 0) 176951078Speter break; 177051078Speter } 177151078Speter if (com_events >= LOTS_OF_EVENTS) 177251078Speter goto repeat; 177351078Speter} 177451078Speter 1775131373Sphkstatic void 1776131094Sphkcombreak(tp, sig) 1777131094Sphk struct tty *tp; 1778131094Sphk int sig; 1779131094Sphk{ 1780131094Sphk struct com_s *com; 1781131094Sphk 1782135329Sphk com = tp->t_sc; 1783131094Sphk 1784131094Sphk if (sig) 1785131094Sphk sio_setreg(com, com_cfcr, com->cfcr_image |= CFCR_SBREAK); 1786131094Sphk else 1787131094Sphk sio_setreg(com, com_cfcr, com->cfcr_image &= ~CFCR_SBREAK); 1788131094Sphk} 1789131094Sphk 1790131094Sphkstatic int 179151078Spetercomparam(tp, t) 179251078Speter struct tty *tp; 179351078Speter struct termios *t; 179451078Speter{ 179551078Speter u_int cfcr; 179651078Speter int cflag; 179751078Speter struct com_s *com; 179889986Sjhay u_int divisor; 179951078Speter u_char dlbh; 180051078Speter u_char dlbl; 1801120159Sbde u_char efr_flowbits; 180251078Speter int s; 180351078Speter 1804135329Sphk com = tp->t_sc; 180589986Sjhay if (com == NULL) 180689986Sjhay return (ENODEV); 180789986Sjhay 180851078Speter /* check requested parameters */ 1809120505Sbde if (t->c_ispeed != (t->c_ospeed != 0 ? t->c_ospeed : tp->t_ospeed)) 1810120505Sbde return (EINVAL); 1811120505Sbde divisor = siodivisor(com->rclk, t->c_ispeed); 1812120505Sbde if (divisor == 0) 1813120505Sbde return (EINVAL); 181451078Speter 181551078Speter /* parameters are OK, convert them to the com struct and the device */ 181651078Speter s = spltty(); 1817120505Sbde if (t->c_ospeed == 0) 1818131094Sphk (void)commodem(tp, 0, SER_DTR); /* hang up line */ 181951078Speter else 1820131094Sphk (void)commodem(tp, SER_DTR, 0); 182151078Speter cflag = t->c_cflag; 182251078Speter switch (cflag & CSIZE) { 182351078Speter case CS5: 182451078Speter cfcr = CFCR_5BITS; 182551078Speter break; 182651078Speter case CS6: 182751078Speter cfcr = CFCR_6BITS; 182851078Speter break; 182951078Speter case CS7: 183051078Speter cfcr = CFCR_7BITS; 183151078Speter break; 183251078Speter default: 183351078Speter cfcr = CFCR_8BITS; 183451078Speter break; 183551078Speter } 183651078Speter if (cflag & PARENB) { 183751078Speter cfcr |= CFCR_PENAB; 183851078Speter if (!(cflag & PARODD)) 183951078Speter cfcr |= CFCR_PEVEN; 184051078Speter } 184151078Speter if (cflag & CSTOPB) 184251078Speter cfcr |= CFCR_STOPB; 184351078Speter 1844120505Sbde if (com->hasfifo) { 184551078Speter /* 184651078Speter * Use a fifo trigger level low enough so that the input 184751078Speter * latency from the fifo is less than about 16 msec and 184851078Speter * the total latency is less than about 30 msec. These 184951078Speter * latencies are reasonable for humans. Serial comms 185051078Speter * protocols shouldn't expect anything better since modem 185151078Speter * latencies are larger. 185288433Sdillon * 185388433Sdillon * The fifo trigger level cannot be set at RX_HIGH for high 185488433Sdillon * speed connections without further work on reducing 185588433Sdillon * interrupt disablement times in other parts of the system, 185688433Sdillon * without producing silo overflow errors. 185751078Speter */ 185893466Sbde com->fifo_image = com->unit == siotsunit ? 0 1859120505Sbde : t->c_ispeed <= 4800 186088451Stanimura ? FIFO_ENABLE : FIFO_ENABLE | FIFO_RX_MEDH; 186151078Speter#ifdef COM_ESP 186251078Speter /* 186351078Speter * The Hayes ESP card needs the fifo DMA mode bit set 186451078Speter * in compatibility mode. If not, it will interrupt 186551078Speter * for each character received. 186651078Speter */ 186751078Speter if (com->esp) 186851078Speter com->fifo_image |= FIFO_DMA_MODE; 186951078Speter#endif 187060471Snyan sio_setreg(com, com_fifo, com->fifo_image); 187151078Speter } 187251078Speter 187365605Sjhb /* 187465605Sjhb * This returns with interrupts disabled so that we can complete 187565605Sjhb * the speed change atomically. Keeping interrupts disabled is 187665605Sjhb * especially important while com_data is hidden. 187765605Sjhb */ 187865605Sjhb (void) siosetwater(com, t->c_ispeed); 187965557Sjasone 1880120505Sbde sio_setreg(com, com_cfcr, cfcr | CFCR_DLAB); 1881120505Sbde /* 1882120505Sbde * Only set the divisor registers if they would change, since on 1883120505Sbde * some 16550 incompatibles (UMC8669F), setting them while input 1884120505Sbde * is arriving loses sync until data stops arriving. 1885120505Sbde */ 1886120505Sbde dlbl = divisor & 0xFF; 1887120505Sbde if (sio_getreg(com, com_dlbl) != dlbl) 1888120505Sbde sio_setreg(com, com_dlbl, dlbl); 1889120505Sbde dlbh = divisor >> 8; 1890120505Sbde if (sio_getreg(com, com_dlbh) != dlbh) 1891120505Sbde sio_setreg(com, com_dlbh, dlbh); 189251078Speter 1893120159Sbde efr_flowbits = 0; 189451078Speter 189551078Speter if (cflag & CRTS_IFLOW) { 189651078Speter com->state |= CS_RTS_IFLOW; 1897120159Sbde efr_flowbits |= EFR_AUTORTS; 189851078Speter /* 189951078Speter * If CS_RTS_IFLOW just changed from off to on, the change 190051078Speter * needs to be propagated to MCR_RTS. This isn't urgent, 190151078Speter * so do it later by calling comstart() instead of repeating 190251078Speter * a lot of code from comstart() here. 190351078Speter */ 190451078Speter } else if (com->state & CS_RTS_IFLOW) { 190551078Speter com->state &= ~CS_RTS_IFLOW; 190651078Speter /* 190751078Speter * CS_RTS_IFLOW just changed from on to off. Force MCR_RTS 190851078Speter * on here, since comstart() won't do it later. 190951078Speter */ 191051078Speter outb(com->modem_ctl_port, com->mcr_image |= MCR_RTS); 191151078Speter } 191251078Speter 191351078Speter /* 191451078Speter * Set up state to handle output flow control. 191551078Speter * XXX - worth handling MDMBUF (DCD) flow control at the lowest level? 191651078Speter * Now has 10+ msec latency, while CTS flow has 50- usec latency. 191751078Speter */ 191851078Speter com->state |= CS_ODEVREADY; 191951078Speter com->state &= ~CS_CTS_OFLOW; 192051078Speter if (cflag & CCTS_OFLOW) { 192151078Speter com->state |= CS_CTS_OFLOW; 1922120159Sbde efr_flowbits |= EFR_AUTOCTS; 192351078Speter if (!(com->last_modem_status & MSR_CTS)) 192451078Speter com->state &= ~CS_ODEVREADY; 192551078Speter } 192651078Speter 1927120159Sbde if (com->st16650a) { 1928120159Sbde sio_setreg(com, com_lcr, LCR_EFR_ENABLE); 1929120159Sbde sio_setreg(com, com_efr, 1930120159Sbde (sio_getreg(com, com_efr) 1931120159Sbde & ~(EFR_AUTOCTS | EFR_AUTORTS)) | efr_flowbits); 1932120159Sbde } 1933120159Sbde sio_setreg(com, com_cfcr, com->cfcr_image = cfcr); 193451078Speter 193551078Speter /* XXX shouldn't call functions while intrs are disabled. */ 1936131134Sphk ttyldoptim(tp); 193751078Speter 193872200Sbmilekic mtx_unlock_spin(&sio_lock); 193951078Speter splx(s); 194051078Speter comstart(tp); 194151078Speter if (com->ibufold != NULL) { 194251078Speter free(com->ibufold, M_DEVBUF); 194351078Speter com->ibufold = NULL; 194451078Speter } 194551078Speter return (0); 194651078Speter} 194751078Speter 194865605Sjhb/* 194970174Sjhb * This function must be called with the sio_lock mutex released and will 195070174Sjhb * return with it obtained. 195165605Sjhb */ 195251078Speterstatic int 195365605Sjhbsiosetwater(com, speed) 195451078Speter struct com_s *com; 195551078Speter speed_t speed; 195651078Speter{ 195751078Speter int cp4ticks; 195851078Speter u_char *ibuf; 195951078Speter int ibufsize; 196051078Speter struct tty *tp; 196151078Speter 196251078Speter /* 196351078Speter * Make the buffer size large enough to handle a softtty interrupt 196451078Speter * latency of about 2 ticks without loss of throughput or data 196551078Speter * (about 3 ticks if input flow control is not used or not honoured, 196651078Speter * but a bit less for CS5-CS7 modes). 196751078Speter */ 196851078Speter cp4ticks = speed / 10 / hz * 4; 196951078Speter for (ibufsize = 128; ibufsize < cp4ticks;) 197051078Speter ibufsize <<= 1; 197165605Sjhb if (ibufsize == com->ibufsize) { 197272200Sbmilekic mtx_lock_spin(&sio_lock); 197351078Speter return (0); 197465605Sjhb } 197551078Speter 197651078Speter /* 197751078Speter * Allocate input buffer. The extra factor of 2 in the size is 197851078Speter * to allow for an error byte for each input byte. 197951078Speter */ 198051078Speter ibuf = malloc(2 * ibufsize, M_DEVBUF, M_NOWAIT); 198165605Sjhb if (ibuf == NULL) { 198272200Sbmilekic mtx_lock_spin(&sio_lock); 198351078Speter return (ENOMEM); 198465605Sjhb } 198551078Speter 198651078Speter /* Initialize non-critical variables. */ 198751078Speter com->ibufold = com->ibuf; 198851078Speter com->ibufsize = ibufsize; 198951078Speter tp = com->tp; 199051078Speter if (tp != NULL) { 199151078Speter tp->t_ififosize = 2 * ibufsize; 199251078Speter tp->t_ispeedwat = (speed_t)-1; 199351078Speter tp->t_ospeedwat = (speed_t)-1; 199451078Speter } 199551078Speter 199651078Speter /* 199751078Speter * Read current input buffer, if any. Continue with interrupts 199851078Speter * disabled. 199951078Speter */ 200072200Sbmilekic mtx_lock_spin(&sio_lock); 200151078Speter if (com->iptr != com->ibuf) 200251078Speter sioinput(com); 200351078Speter 200451078Speter /*- 200551078Speter * Initialize critical variables, including input buffer watermarks. 200651078Speter * The external device is asked to stop sending when the buffer 200751078Speter * exactly reaches high water, or when the high level requests it. 200851078Speter * The high level is notified immediately (rather than at a later 200951078Speter * clock tick) when this watermark is reached. 201051078Speter * The buffer size is chosen so the watermark should almost never 201151078Speter * be reached. 201251078Speter * The low watermark is invisibly 0 since the buffer is always 201351078Speter * emptied all at once. 201451078Speter */ 201551078Speter com->iptr = com->ibuf = ibuf; 201651078Speter com->ibufend = ibuf + ibufsize; 201751078Speter com->ierroff = ibufsize; 201851078Speter com->ihighwater = ibuf + 3 * ibufsize / 4; 201951078Speter return (0); 202051078Speter} 202151078Speter 202251078Speterstatic void 202351078Spetercomstart(tp) 202451078Speter struct tty *tp; 202551078Speter{ 202651078Speter struct com_s *com; 202751078Speter int s; 202851078Speter 2029135329Sphk com = tp->t_sc; 203057915Simp if (com == NULL) 203157915Simp return; 203251078Speter s = spltty(); 203372200Sbmilekic mtx_lock_spin(&sio_lock); 203451078Speter if (tp->t_state & TS_TTSTOP) 203551078Speter com->state &= ~CS_TTGO; 203651078Speter else 203751078Speter com->state |= CS_TTGO; 203851078Speter if (tp->t_state & TS_TBLOCK) { 203951078Speter if (com->mcr_image & MCR_RTS && com->state & CS_RTS_IFLOW) 204051078Speter outb(com->modem_ctl_port, com->mcr_image &= ~MCR_RTS); 204151078Speter } else { 204251078Speter if (!(com->mcr_image & MCR_RTS) && com->iptr < com->ihighwater 204351078Speter && com->state & CS_RTS_IFLOW) 204451078Speter outb(com->modem_ctl_port, com->mcr_image |= MCR_RTS); 204551078Speter } 204672200Sbmilekic mtx_unlock_spin(&sio_lock); 204751078Speter if (tp->t_state & (TS_TIMEOUT | TS_TTSTOP)) { 204851078Speter ttwwakeup(tp); 204951078Speter splx(s); 205051078Speter return; 205151078Speter } 205251078Speter if (tp->t_outq.c_cc != 0) { 205351078Speter struct lbq *qp; 205451078Speter struct lbq *next; 205551078Speter 205651078Speter if (!com->obufs[0].l_queued) { 205751078Speter com->obufs[0].l_tail 205851078Speter = com->obuf1 + q_to_b(&tp->t_outq, com->obuf1, 205951078Speter sizeof com->obuf1); 206051078Speter com->obufs[0].l_next = NULL; 206151078Speter com->obufs[0].l_queued = TRUE; 206272200Sbmilekic mtx_lock_spin(&sio_lock); 206351078Speter if (com->state & CS_BUSY) { 206451078Speter qp = com->obufq.l_next; 206551078Speter while ((next = qp->l_next) != NULL) 206651078Speter qp = next; 206751078Speter qp->l_next = &com->obufs[0]; 206851078Speter } else { 206951078Speter com->obufq.l_head = com->obufs[0].l_head; 207051078Speter com->obufq.l_tail = com->obufs[0].l_tail; 207151078Speter com->obufq.l_next = &com->obufs[0]; 207251078Speter com->state |= CS_BUSY; 207351078Speter } 207472200Sbmilekic mtx_unlock_spin(&sio_lock); 207551078Speter } 207651078Speter if (tp->t_outq.c_cc != 0 && !com->obufs[1].l_queued) { 207751078Speter com->obufs[1].l_tail 207851078Speter = com->obuf2 + q_to_b(&tp->t_outq, com->obuf2, 207951078Speter sizeof com->obuf2); 208051078Speter com->obufs[1].l_next = NULL; 208151078Speter com->obufs[1].l_queued = TRUE; 208272200Sbmilekic mtx_lock_spin(&sio_lock); 208351078Speter if (com->state & CS_BUSY) { 208451078Speter qp = com->obufq.l_next; 208551078Speter while ((next = qp->l_next) != NULL) 208651078Speter qp = next; 208751078Speter qp->l_next = &com->obufs[1]; 208851078Speter } else { 208951078Speter com->obufq.l_head = com->obufs[1].l_head; 209051078Speter com->obufq.l_tail = com->obufs[1].l_tail; 209151078Speter com->obufq.l_next = &com->obufs[1]; 209251078Speter com->state |= CS_BUSY; 209351078Speter } 209472200Sbmilekic mtx_unlock_spin(&sio_lock); 209551078Speter } 209651078Speter tp->t_state |= TS_BUSY; 209751078Speter } 209872200Sbmilekic mtx_lock_spin(&sio_lock); 209951078Speter if (com->state >= (CS_BUSY | CS_TTGO)) 210051078Speter siointr1(com); /* fake interrupt to start output */ 210172200Sbmilekic mtx_unlock_spin(&sio_lock); 210251078Speter ttwwakeup(tp); 210351078Speter splx(s); 210451078Speter} 210551078Speter 210651078Speterstatic void 210751654Sphkcomstop(tp, rw) 210851078Speter struct tty *tp; 210951078Speter int rw; 211051078Speter{ 211151078Speter struct com_s *com; 211251078Speter 2113135329Sphk com = tp->t_sc; 211457915Simp if (com == NULL || com->gone) 211551078Speter return; 211672200Sbmilekic mtx_lock_spin(&sio_lock); 211751078Speter if (rw & FWRITE) { 211851078Speter if (com->hasfifo) 211951078Speter#ifdef COM_ESP 212051078Speter /* XXX avoid h/w bug. */ 212151078Speter if (!com->esp) 212251078Speter#endif 212360471Snyan sio_setreg(com, com_fifo, 212460471Snyan FIFO_XMT_RST | com->fifo_image); 212551078Speter com->obufs[0].l_queued = FALSE; 212651078Speter com->obufs[1].l_queued = FALSE; 212751078Speter if (com->state & CS_ODONE) 212851078Speter com_events -= LOTS_OF_EVENTS; 212951078Speter com->state &= ~(CS_ODONE | CS_BUSY); 213051078Speter com->tp->t_state &= ~TS_BUSY; 213151078Speter } 213251078Speter if (rw & FREAD) { 213351078Speter if (com->hasfifo) 213451078Speter#ifdef COM_ESP 213551078Speter /* XXX avoid h/w bug. */ 213651078Speter if (!com->esp) 213751078Speter#endif 213860471Snyan sio_setreg(com, com_fifo, 213960471Snyan FIFO_RCV_RST | com->fifo_image); 214051078Speter com_events -= (com->iptr - com->ibuf); 214151078Speter com->iptr = com->ibuf; 214251078Speter } 214372200Sbmilekic mtx_unlock_spin(&sio_lock); 214451078Speter comstart(tp); 214551078Speter} 214651078Speter 214751078Speterstatic int 2148136478Sphkcommodem(struct tty *tp, int sigon, int sigoff) 2149131094Sphk{ 215051078Speter struct com_s *com; 2151131094Sphk int bitand, bitor, msr; 215251078Speter 2153135329Sphk com = tp->t_sc; 2154131094Sphk if (com->gone) 2155131094Sphk return(0); 2156131094Sphk if (sigon != 0 || sigoff != 0) { 2157131094Sphk bitand = bitor = 0; 2158131094Sphk if (sigoff & SER_DTR) 2159131094Sphk bitand |= MCR_DTR; 2160131094Sphk if (sigoff & SER_RTS) 2161131094Sphk bitand |= MCR_RTS; 2162131094Sphk if (sigon & SER_DTR) 2163131094Sphk bitor |= MCR_DTR; 2164131094Sphk if (sigon & SER_RTS) 2165131094Sphk bitor |= MCR_RTS; 2166131094Sphk bitand = ~bitand; 2167131094Sphk mtx_lock_spin(&sio_lock); 2168131094Sphk com->mcr_image &= bitand; 2169131094Sphk com->mcr_image |= bitor; 2170131094Sphk outb(com->modem_ctl_port, com->mcr_image); 2171131094Sphk mtx_unlock_spin(&sio_lock); 2172131094Sphk return (0); 2173131094Sphk } else { 2174131094Sphk bitor = 0; 2175131094Sphk if (com->mcr_image & MCR_DTR) 2176131094Sphk bitor |= SER_DTR; 2177131094Sphk if (com->mcr_image & MCR_RTS) 2178131094Sphk bitor |= SER_RTS; 217951078Speter msr = com->prev_modem_status; 218051078Speter if (msr & MSR_CTS) 2181131094Sphk bitor |= SER_CTS; 218251078Speter if (msr & MSR_DCD) 2183131094Sphk bitor |= SER_DCD; 218451078Speter if (msr & MSR_DSR) 2185131094Sphk bitor |= SER_DSR; 2186131094Sphk if (msr & MSR_DSR) 2187131094Sphk bitor |= SER_DSR; 218851078Speter if (msr & (MSR_RI | MSR_TERI)) 2189131094Sphk bitor |= SER_RI; 2190131094Sphk return (bitor); 219151078Speter } 219251078Speter} 219351078Speter 219451078Speterstatic void 219551078Spetersiosettimeout() 219651078Speter{ 219751078Speter struct com_s *com; 219851078Speter bool_t someopen; 219951078Speter int unit; 220051078Speter 220151078Speter /* 220251078Speter * Set our timeout period to 1 second if no polled devices are open. 220351078Speter * Otherwise set it to max(1/200, 1/hz). 220451078Speter * Enable timeouts iff some device is open. 220551078Speter */ 220651078Speter untimeout(comwakeup, (void *)NULL, sio_timeout_handle); 220751078Speter sio_timeout = hz; 220851078Speter someopen = FALSE; 220953344Speter for (unit = 0; unit < sio_numunits; ++unit) { 221051078Speter com = com_addr(unit); 221151078Speter if (com != NULL && com->tp != NULL 221251078Speter && com->tp->t_state & TS_ISOPEN && !com->gone) { 221351078Speter someopen = TRUE; 221451078Speter if (com->poll || com->poll_output) { 221551078Speter sio_timeout = hz > 200 ? hz / 200 : 1; 221651078Speter break; 221751078Speter } 221851078Speter } 221951078Speter } 222051078Speter if (someopen) { 222151078Speter sio_timeouts_until_log = hz / sio_timeout; 222251078Speter sio_timeout_handle = timeout(comwakeup, (void *)NULL, 222351078Speter sio_timeout); 222451078Speter } else { 222551078Speter /* Flush error messages, if any. */ 222651078Speter sio_timeouts_until_log = 1; 222751078Speter comwakeup((void *)NULL); 222851078Speter untimeout(comwakeup, (void *)NULL, sio_timeout_handle); 222951078Speter } 223051078Speter} 223151078Speter 223251078Speterstatic void 223351078Spetercomwakeup(chan) 223451078Speter void *chan; 223551078Speter{ 223651078Speter struct com_s *com; 223751078Speter int unit; 223851078Speter 223951078Speter sio_timeout_handle = timeout(comwakeup, (void *)NULL, sio_timeout); 224051078Speter 224151078Speter /* 224251078Speter * Recover from lost output interrupts. 224351078Speter * Poll any lines that don't use interrupts. 224451078Speter */ 224553344Speter for (unit = 0; unit < sio_numunits; ++unit) { 224651078Speter com = com_addr(unit); 224751078Speter if (com != NULL && !com->gone 224851078Speter && (com->state >= (CS_BUSY | CS_TTGO) || com->poll)) { 224972200Sbmilekic mtx_lock_spin(&sio_lock); 225051078Speter siointr1(com); 225172200Sbmilekic mtx_unlock_spin(&sio_lock); 225251078Speter } 225351078Speter } 225451078Speter 225551078Speter /* 225651078Speter * Check for and log errors, but not too often. 225751078Speter */ 225851078Speter if (--sio_timeouts_until_log > 0) 225951078Speter return; 226051078Speter sio_timeouts_until_log = hz / sio_timeout; 226153344Speter for (unit = 0; unit < sio_numunits; ++unit) { 226251078Speter int errnum; 226351078Speter 226451078Speter com = com_addr(unit); 226551078Speter if (com == NULL) 226651078Speter continue; 226751078Speter if (com->gone) 226851078Speter continue; 226951078Speter for (errnum = 0; errnum < CE_NTYPES; ++errnum) { 227051078Speter u_int delta; 227151078Speter u_long total; 227251078Speter 227372200Sbmilekic mtx_lock_spin(&sio_lock); 227451078Speter delta = com->delta_error_counts[errnum]; 227551078Speter com->delta_error_counts[errnum] = 0; 227672200Sbmilekic mtx_unlock_spin(&sio_lock); 227751078Speter if (delta == 0) 227851078Speter continue; 227951078Speter total = com->error_counts[errnum] += delta; 228051078Speter log(LOG_ERR, "sio%d: %u more %s%s (total %lu)\n", 228151078Speter unit, delta, error_desc[errnum], 228251078Speter delta == 1 ? "" : "s", total); 228351078Speter } 228451078Speter } 228551078Speter} 228651078Speter 228751078Speter/* 228851078Speter * Following are all routines needed for SIO to act as console 228951078Speter */ 229051078Speterstruct siocnstate { 229151078Speter u_char dlbl; 229251078Speter u_char dlbh; 229351078Speter u_char ier; 229451078Speter u_char cfcr; 229551078Speter u_char mcr; 229651078Speter}; 229751078Speter 2298120457Sphk/* 2299120457Sphk * This is a function in order to not replicate "ttyd%d" more 2300120457Sphk * places than absolutely necessary. 2301120457Sphk */ 2302120457Sphkstatic void 2303120457Sphksiocnset(struct consdev *cd, int unit) 2304120457Sphk{ 2305120457Sphk 2306120457Sphk cd->cn_unit = unit; 2307120457Sphk sprintf(cd->cn_name, "ttyd%d", unit); 2308120457Sphk} 2309120457Sphk 231092739Salfredstatic speed_t siocngetspeed(Port_t, u_long rclk); 231193010Sbdestatic void siocnclose(struct siocnstate *sp, Port_t iobase); 231293010Sbdestatic void siocnopen(struct siocnstate *sp, Port_t iobase, int speed); 231393010Sbdestatic void siocntxwait(Port_t iobase); 231451078Speter 2315158943Sphkstatic cn_probe_t sio_cnprobe; 2316158943Sphkstatic cn_init_t sio_cninit; 2317158943Sphkstatic cn_term_t sio_cnterm; 2318158943Sphkstatic cn_getc_t sio_cngetc; 2319158943Sphkstatic cn_putc_t sio_cnputc; 232051078Speter 2321158947SphkCONSOLE_DRIVER(sio); 232251078Speter 232351078Speterstatic void 232451078Spetersiocntxwait(iobase) 232551078Speter Port_t iobase; 232651078Speter{ 232751078Speter int timo; 232851078Speter 232951078Speter /* 233051078Speter * Wait for any pending transmission to finish. Required to avoid 233151078Speter * the UART lockup bug when the speed is changed, and for normal 233251078Speter * transmits. 233351078Speter */ 233451078Speter timo = 100000; 233551078Speter while ((inb(iobase + com_lsr) & (LSR_TSRE | LSR_TXRDY)) 233651078Speter != (LSR_TSRE | LSR_TXRDY) && --timo != 0) 233751078Speter ; 233851078Speter} 233951078Speter 234051078Speter/* 234151078Speter * Read the serial port specified and try to figure out what speed 234251078Speter * it's currently running at. We're assuming the serial port has 234351078Speter * been initialized and is basicly idle. This routine is only intended 234451078Speter * to be run at system startup. 234551078Speter * 234651078Speter * If the value read from the serial port doesn't make sense, return 0. 234751078Speter */ 234851078Speter 234951078Speterstatic speed_t 235089986Sjhaysiocngetspeed(iobase, rclk) 235189986Sjhay Port_t iobase; 235289986Sjhay u_long rclk; 235351078Speter{ 235489986Sjhay u_int divisor; 235551078Speter u_char dlbh; 235651078Speter u_char dlbl; 235751078Speter u_char cfcr; 235851078Speter 235951078Speter cfcr = inb(iobase + com_cfcr); 236051078Speter outb(iobase + com_cfcr, CFCR_DLAB | cfcr); 236151078Speter 236251078Speter dlbl = inb(iobase + com_dlbl); 236351078Speter dlbh = inb(iobase + com_dlbh); 236451078Speter 236551078Speter outb(iobase + com_cfcr, cfcr); 236651078Speter 236789986Sjhay divisor = dlbh << 8 | dlbl; 236851078Speter 236989986Sjhay /* XXX there should be more sanity checking. */ 237089986Sjhay if (divisor == 0) 237189986Sjhay return (CONSPEED); 237289986Sjhay return (rclk / (16UL * divisor)); 237351078Speter} 237451078Speter 237551078Speterstatic void 237651078Spetersiocnopen(sp, iobase, speed) 237751078Speter struct siocnstate *sp; 237851078Speter Port_t iobase; 237951078Speter int speed; 238051078Speter{ 238189986Sjhay u_int divisor; 238251078Speter u_char dlbh; 238351078Speter u_char dlbl; 238451078Speter 238551078Speter /* 238651078Speter * Save all the device control registers except the fifo register 238751078Speter * and set our default ones (cs8 -parenb speed=comdefaultrate). 238851078Speter * We can't save the fifo register since it is read-only. 238951078Speter */ 239051078Speter sp->ier = inb(iobase + com_ier); 239151078Speter outb(iobase + com_ier, 0); /* spltty() doesn't stop siointr() */ 239251078Speter siocntxwait(iobase); 239351078Speter sp->cfcr = inb(iobase + com_cfcr); 239451078Speter outb(iobase + com_cfcr, CFCR_DLAB | CFCR_8BITS); 239551078Speter sp->dlbl = inb(iobase + com_dlbl); 239651078Speter sp->dlbh = inb(iobase + com_dlbh); 239751078Speter /* 239851078Speter * Only set the divisor registers if they would change, since on 239951078Speter * some 16550 incompatibles (Startech), setting them clears the 240051078Speter * data input register. This also reduces the effects of the 240151078Speter * UMC8669F bug. 240251078Speter */ 240389986Sjhay divisor = siodivisor(comdefaultrclk, speed); 240451078Speter dlbl = divisor & 0xFF; 240551078Speter if (sp->dlbl != dlbl) 240651078Speter outb(iobase + com_dlbl, dlbl); 240789986Sjhay dlbh = divisor >> 8; 240851078Speter if (sp->dlbh != dlbh) 240951078Speter outb(iobase + com_dlbh, dlbh); 241051078Speter outb(iobase + com_cfcr, CFCR_8BITS); 241151078Speter sp->mcr = inb(iobase + com_mcr); 241251078Speter /* 241351078Speter * We don't want interrupts, but must be careful not to "disable" 241451078Speter * them by clearing the MCR_IENABLE bit, since that might cause 241551078Speter * an interrupt by floating the IRQ line. 241651078Speter */ 241751078Speter outb(iobase + com_mcr, (sp->mcr & MCR_IENABLE) | MCR_DTR | MCR_RTS); 241851078Speter} 241951078Speter 242051078Speterstatic void 242151078Spetersiocnclose(sp, iobase) 242251078Speter struct siocnstate *sp; 242351078Speter Port_t iobase; 242451078Speter{ 242551078Speter /* 242651078Speter * Restore the device control registers. 242751078Speter */ 242851078Speter siocntxwait(iobase); 242951078Speter outb(iobase + com_cfcr, CFCR_DLAB | CFCR_8BITS); 243051078Speter if (sp->dlbl != inb(iobase + com_dlbl)) 243151078Speter outb(iobase + com_dlbl, sp->dlbl); 243251078Speter if (sp->dlbh != inb(iobase + com_dlbh)) 243351078Speter outb(iobase + com_dlbh, sp->dlbh); 243451078Speter outb(iobase + com_cfcr, sp->cfcr); 243551078Speter /* 243651078Speter * XXX damp oscillations of MCR_DTR and MCR_RTS by not restoring them. 243751078Speter */ 243851078Speter outb(iobase + com_mcr, sp->mcr | MCR_DTR | MCR_RTS); 243951078Speter outb(iobase + com_ier, sp->ier); 244051078Speter} 244151078Speter 244251078Speterstatic void 2443158943Sphksio_cnprobe(cp) 244451078Speter struct consdev *cp; 244551078Speter{ 244651078Speter speed_t boot_speed; 244751078Speter u_char cfcr; 244889986Sjhay u_int divisor; 2449128899Sambrisko int s, unit; 245051078Speter struct siocnstate sp; 245151078Speter 245251078Speter /* 245351078Speter * Find our first enabled console, if any. If it is a high-level 245451078Speter * console device, then initialize it and return successfully. 245551078Speter * If it is a low-level console device, then initialize it and 245651078Speter * return unsuccessfully. It must be initialized in both cases 245751078Speter * for early use by console drivers and debuggers. Initializing 245851078Speter * the hardware is not necessary in all cases, since the i/o 245951078Speter * routines initialize it on the fly, but it is necessary if 246051078Speter * input might arrive while the hardware is switched back to an 246151078Speter * uninitialized state. We can't handle multiple console devices 246251078Speter * yet because our low-level routines don't take a device arg. 246351078Speter * We trust the user to set the console flags properly so that we 246451078Speter * don't need to probe. 246551078Speter */ 246651078Speter cp->cn_pri = CN_DEAD; 246751078Speter 2468128899Sambrisko for (unit = 0; unit < 16; unit++) { /* XXX need to know how many */ 2469128899Sambrisko int flags; 2470117167Sjhb 2471128899Sambrisko if (resource_disabled("sio", unit)) 2472128899Sambrisko continue; 2473128899Sambrisko if (resource_int_value("sio", unit, "flags", &flags)) 2474128899Sambrisko continue; 2475128899Sambrisko if (COM_CONSOLE(flags) || COM_DEBUGGER(flags)) { 2476128899Sambrisko int port; 2477128899Sambrisko Port_t iobase; 2478128899Sambrisko 2479128899Sambrisko if (resource_int_value("sio", unit, "port", &port)) 2480128781Sambrisko continue; 2481128899Sambrisko iobase = port; 2482128899Sambrisko s = spltty(); 2483174283Sjulian if ((boothowto & RB_SERIAL) && COM_CONSOLE(flags)) { 2484128899Sambrisko boot_speed = 2485128899Sambrisko siocngetspeed(iobase, comdefaultrclk); 2486128899Sambrisko if (boot_speed) 2487128899Sambrisko comdefaultrate = boot_speed; 248851078Speter } 248951078Speter 249051078Speter /* 249151078Speter * Initialize the divisor latch. We can't rely on 249251078Speter * siocnopen() to do this the first time, since it 249351078Speter * avoids writing to the latch if the latch appears 249451078Speter * to have the correct value. Also, if we didn't 249551078Speter * just read the speed from the hardware, then we 249651078Speter * need to set the speed in hardware so that 249751078Speter * switching it later is null. 249851078Speter */ 2499128899Sambrisko cfcr = inb(iobase + com_cfcr); 2500128899Sambrisko outb(iobase + com_cfcr, CFCR_DLAB | cfcr); 2501128899Sambrisko divisor = siodivisor(comdefaultrclk, comdefaultrate); 2502128899Sambrisko outb(iobase + com_dlbl, divisor & 0xff); 2503128899Sambrisko outb(iobase + com_dlbh, divisor >> 8); 2504128899Sambrisko outb(iobase + com_cfcr, cfcr); 250551078Speter 2506128899Sambrisko siocnopen(&sp, iobase, comdefaultrate); 250751078Speter 2508128899Sambrisko splx(s); 2509128899Sambrisko if (COM_CONSOLE(flags) && !COM_LLCONSOLE(flags)) { 2510128899Sambrisko siocnset(cp, unit); 2511128899Sambrisko cp->cn_pri = COM_FORCECONSOLE(flags) 2512128899Sambrisko || boothowto & RB_SERIAL 2513128899Sambrisko ? CN_REMOTE : CN_NORMAL; 2514128899Sambrisko siocniobase = iobase; 2515128899Sambrisko siocnunit = unit; 2516128899Sambrisko } 2517131939Smarcel#ifdef GDB 2518131939Smarcel if (COM_DEBUGGER(flags)) 2519128899Sambrisko siogdbiobase = iobase; 252051078Speter#endif 252151078Speter } 252251078Speter } 252351078Speter} 252451078Speter 252566230Sjhbstatic void 2526158943Sphksio_cninit(cp) 252766230Sjhb struct consdev *cp; 252866230Sjhb{ 2529120457Sphk comconsole = cp->cn_unit; 253066230Sjhb} 253166230Sjhb 253285371Sjlemonstatic void 2533158943Sphksio_cnterm(cp) 253485371Sjlemon struct consdev *cp; 253585371Sjlemon{ 253685371Sjlemon comconsole = -1; 253785371Sjlemon} 253885371Sjlemon 253951078Speterstatic int 2540158947Sphksio_cngetc(struct consdev *cd) 254151078Speter{ 254251078Speter int c; 254351078Speter Port_t iobase; 254451078Speter int s; 254551078Speter struct siocnstate sp; 254698401Sn_hibma speed_t speed; 2547131939Smarcel 2548131939Smarcel if (cd != NULL && cd->cn_unit == siocnunit) { 254998401Sn_hibma iobase = siocniobase; 255098401Sn_hibma speed = comdefaultrate; 255198401Sn_hibma } else { 2552131939Smarcel#ifdef GDB 255351078Speter iobase = siogdbiobase; 255498401Sn_hibma speed = gdbdefaultrate; 2555131939Smarcel#else 2556131939Smarcel return (-1); 2557131939Smarcel#endif 255898401Sn_hibma } 255951078Speter s = spltty(); 256098401Sn_hibma siocnopen(&sp, iobase, speed); 256151078Speter if (inb(iobase + com_lsr) & LSR_RXRDY) 256251078Speter c = inb(iobase + com_data); 256351078Speter else 256451078Speter c = -1; 256551078Speter siocnclose(&sp, iobase); 256651078Speter splx(s); 256751078Speter return (c); 256851078Speter} 256951078Speter 2570104094Sphkstatic void 2571158943Sphksio_cnputc(struct consdev *cd, int c) 257251078Speter{ 257388582Sbde int need_unlock; 257451078Speter int s; 257551078Speter struct siocnstate sp; 257651078Speter Port_t iobase; 257798401Sn_hibma speed_t speed; 257851078Speter 2579131939Smarcel if (cd != NULL && cd->cn_unit == siocnunit) { 258098401Sn_hibma iobase = siocniobase; 258198401Sn_hibma speed = comdefaultrate; 258298401Sn_hibma } else { 2583131939Smarcel#ifdef GDB 258451078Speter iobase = siogdbiobase; 258598401Sn_hibma speed = gdbdefaultrate; 2586131939Smarcel#else 2587131939Smarcel return; 2588131939Smarcel#endif 258998401Sn_hibma } 259051078Speter s = spltty(); 259188582Sbde need_unlock = 0; 2592141530Srwatson if (!kdb_active && sio_inited == 2 && !mtx_owned(&sio_lock)) { 2593141530Srwatson mtx_lock_spin(&sio_lock); 2594141530Srwatson need_unlock = 1; 259588582Sbde } 259698401Sn_hibma siocnopen(&sp, iobase, speed); 259751078Speter siocntxwait(iobase); 259851078Speter outb(iobase + com_data, c); 259951078Speter siocnclose(&sp, iobase); 2600141530Srwatson if (need_unlock) 2601141530Srwatson mtx_unlock_spin(&sio_lock); 260251078Speter splx(s); 260351078Speter} 260451078Speter 2605131939Smarcel/* 2606131939Smarcel * Remote gdb(1) support. 2607131939Smarcel */ 2608131939Smarcel 2609131939Smarcel#if defined(GDB) 2610131939Smarcel 2611131939Smarcel#include <gdb/gdb.h> 2612131939Smarcel 2613131939Smarcelstatic gdb_probe_f siogdbprobe; 2614131939Smarcelstatic gdb_init_f siogdbinit; 2615131939Smarcelstatic gdb_term_f siogdbterm; 2616131939Smarcelstatic gdb_getc_f siogdbgetc; 2617131939Smarcelstatic gdb_putc_f siogdbputc; 2618131939Smarcel 2619158950SphkGDB_DBGPORT(sio, siogdbprobe, siogdbinit, siogdbterm, siogdbgetc, siogdbputc); 2620131939Smarcel 2621131939Smarcelstatic int 2622131939Smarcelsiogdbprobe(void) 262351078Speter{ 2624131939Smarcel return ((siogdbiobase != 0) ? 0 : -1); 2625131939Smarcel} 262651078Speter 2627131939Smarcelstatic void 2628131939Smarcelsiogdbinit(void) 2629131939Smarcel{ 2630131939Smarcel} 263198401Sn_hibma 2632131939Smarcelstatic void 2633131939Smarcelsiogdbterm(void) 2634131939Smarcel{ 263551078Speter} 263651078Speter 2637131939Smarcelstatic void 2638131939Smarcelsiogdbputc(int c) 263951078Speter{ 2640158943Sphk sio_cnputc(NULL, c); 2641131939Smarcel} 264251078Speter 2643131939Smarcelstatic int 2644158947Sphksiogdbgetc(void) 2645131939Smarcel{ 2646158950Sphk return (sio_cngetc(NULL)); 264751078Speter} 2648131939Smarcel 264951078Speter#endif 2650