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freebsd-dev/sys/dev/cy/cy.c
Pedro F. Giffuni 718cf2ccb9 sys/dev: further adoption of SPDX licensing ID tags. 
Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.
2017-11-27 14:52:40 +00:00

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/*-
* cyclades cyclom-y serial driver
* Andrew Herbert <andrew@werple.apana.org.au>, 17 August 1993
*
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 1993 Andrew Herbert.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name Andrew Herbert may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
* NO EVENT SHALL I BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_compat.h"
/*
* TODO:
* Atomic COR change.
* Consoles.
*/
/*
* Temporary compile-time configuration options.
*/
#define RxFifoThreshold (CD1400_RX_FIFO_SIZE / 2)
/* Number of chars in the receiver FIFO before an
* an interrupt is generated. Should depend on
* line speed. Needs to be about 6 on a 486DX33
* for 4 active ports at 115200 bps. Why doesn't
* 10 work?
*/
#define PollMode /* Use polling-based irq service routine, not the
* hardware svcack lines. Must be defined for
* Cyclom-16Y boards. Less efficient for Cyclom-8Ys,
* and stops 4 * 115200 bps from working.
*/
#undef Smarts /* Enable slightly more CD1400 intelligence. Mainly
* the output CR/LF processing, plus we can avoid a
* few checks usually done in ttyinput().
*
* XXX not fully implemented, and not particularly
* worthwhile.
*/
#undef CyDebug /* Include debugging code (not very expensive). */
/* These will go away. */
#undef SOFT_CTS_OFLOW
#define SOFT_HOTCHAR
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/fcntl.h>
#include <sys/interrupt.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <sys/serial.h>
#include <sys/syslog.h>
#include <sys/tty.h>
#include <machine/psl.h>
#include <dev/ic/cd1400.h>
#include <dev/cy/cyreg.h>
#include <dev/cy/cyvar.h>
#define NCY 10 /* KLUDGE */
#define NPORTS (NCY * CY_MAX_PORTS)
#define CY_MAX_PORTS (CD1400_NO_OF_CHANNELS * CY_MAX_CD1400s)
/* We encode the cyclom unit number (cyu) in spare bits in the IVR's. */
#define CD1400_xIVR_CHAN_SHIFT 3
#define CD1400_xIVR_CHAN 0x1F
/*
* ETC states. com->etc may also contain a hardware ETC command value,
* meaning that execution of that command is pending.
*/
#define ETC_NONE 0 /* we depend on bzero() setting this */
#define ETC_BREAK_STARTING 1
#define ETC_BREAK_STARTED 2
#define ETC_BREAK_ENDING 3
#define ETC_BREAK_ENDED 4
#define LOTS_OF_EVENTS 64 /* helps separate urgent events from input */
/*
* com state bits.
* (CS_BUSY | CS_TTGO) and (CS_BUSY | CS_TTGO | CS_ODEVREADY) must be higher
* than the other bits so that they can be tested as a group without masking
* off the low bits.
*
* The following com and tty flags correspond closely:
* CS_BUSY = TS_BUSY (maintained by cystart(), cypoll() and
* comstop())
* CS_TTGO = ~TS_TTSTOP (maintained by cyparam() and cystart())
* CS_CTS_OFLOW = CCTS_OFLOW (maintained by cyparam())
* CS_RTS_IFLOW = CRTS_IFLOW (maintained by cyparam())
* TS_FLUSH is not used.
* XXX I think TIOCSETA doesn't clear TS_TTSTOP when it clears IXON.
* XXX CS_*FLOW should be CF_*FLOW in com->flags (control flags not state).
*/
#define CS_BUSY 0x80 /* output in progress */
#define CS_TTGO 0x40 /* output not stopped by XOFF */
#define CS_ODEVREADY 0x20 /* external device h/w ready (CTS) */
#define CS_CHECKMSR 1 /* check of MSR scheduled */
#define CS_CTS_OFLOW 2 /* use CTS output flow control */
#define CS_ODONE 4 /* output completed */
#define CS_RTS_IFLOW 8 /* use RTS input flow control */
#define CSE_ODONE 1 /* output transmitted */
static char const * const error_desc[] = {
#define CE_OVERRUN 0
"silo overflow",
#define CE_INTERRUPT_BUF_OVERFLOW 1
"interrupt-level buffer overflow",
#define CE_TTY_BUF_OVERFLOW 2
"tty-level buffer overflow",
};
#define CE_NTYPES 3
#define CE_RECORD(com, errnum) (++(com)->delta_error_counts[errnum])
#ifdef SMP
#define COM_LOCK() mtx_lock_spin(&cy_lock)
#define COM_UNLOCK() mtx_unlock_spin(&cy_lock)
#else
#define COM_LOCK()
#define COM_UNLOCK()
#endif
/* types. XXX - should be elsewhere */
typedef u_char bool_t; /* boolean */
/* queue of linear buffers */
struct lbq {
u_char *l_head; /* next char to process */
u_char *l_tail; /* one past the last char to process */
struct lbq *l_next; /* next in queue */
bool_t l_queued; /* nonzero if queued */
};
/* com device structure */
struct com_s {
u_char state; /* miscellaneous flag bits */
u_char etc; /* pending Embedded Transmit Command */
u_char extra_state; /* more flag bits, separate for order trick */
u_char gfrcr_image; /* copy of value read from GFRCR */
u_char mcr_dtr; /* MCR bit that is wired to DTR */
u_char mcr_image; /* copy of value written to MCR */
u_char mcr_rts; /* MCR bit that is wired to RTS */
int unit; /* unit number */
/*
* The high level of the driver never reads status registers directly
* because there would be too many side effects to handle conveniently.
* Instead, it reads copies of the registers stored here by the
* interrupt handler.
*/
u_char last_modem_status; /* last MSR read by intr handler */
u_char prev_modem_status; /* last MSR handled by high level */
u_char *ibuf; /* start of input buffer */
u_char *ibufend; /* end of input buffer */
u_char *ibufold; /* old input buffer, to be freed */
u_char *ihighwater; /* threshold in input buffer */
u_char *iptr; /* next free spot in input buffer */
int ibufsize; /* size of ibuf (not include error bytes) */
int ierroff; /* offset of error bytes in ibuf */
struct lbq obufq; /* head of queue of output buffers */
struct lbq obufs[2]; /* output buffers */
int cy_align; /* index for register alignment */
cy_addr cy_iobase; /* base address of this port's cyclom */
cy_addr iobase; /* base address of this port's cd1400 */
int mcr_rts_reg; /* cd1400 reg number of reg holding mcr_rts */
struct tty *tp; /* cross reference */
u_long bytes_in; /* statistics */
u_long bytes_out;
u_int delta_error_counts[CE_NTYPES];
u_long error_counts[CE_NTYPES];
u_int recv_exception; /* exception chars received */
u_int mdm; /* modem signal changes */
#ifdef CyDebug
u_int start_count; /* no. of calls to cystart() */
u_int start_real; /* no. of calls that did something */
#endif
u_char car; /* CD1400 CAR shadow (if first unit in cd) */
u_char channel_control;/* CD1400 CCR control command shadow */
u_char cor[3]; /* CD1400 COR1-3 shadows */
u_char intr_enable; /* CD1400 SRER shadow */
/*
* Data area for output buffers. Someday we should build the output
* buffer queue without copying data.
*/
u_char obuf1[256];
u_char obuf2[256];
};
devclass_t cy_devclass;
char cy_driver_name[] = "cy";
static void cd1400_channel_cmd(struct com_s *com, int cmd);
static void cd1400_channel_cmd_wait(struct com_s *com);
static void cd_etc(struct com_s *com, int etc);
static int cd_getreg(struct com_s *com, int reg);
static void cd_setreg(struct com_s *com, int reg, int val);
static void cyinput(struct com_s *com);
static int cyparam(struct tty *tp, struct termios *t);
static void cypoll(void *arg);
static void cysettimeout(void);
static int cysetwater(struct com_s *com, speed_t speed);
static int cyspeed(speed_t speed, u_long cy_clock, int *prescaler_io);
static void cystart(struct tty *tp);
static void comstop(struct tty *tp, int rw);
static timeout_t cywakeup;
static void disc_optim(struct tty *tp, struct termios *t,
struct com_s *com);
static t_break_t cybreak;
static t_modem_t cymodem;
static t_open_t cyopen;
static t_close_t cyclose;
#ifdef CyDebug
void cystatus(int unit);
#endif
static struct mtx cy_lock;
static int cy_inited;
/* table and macro for fast conversion from a unit number to its com struct */
static struct com_s *p_cy_addr[NPORTS];
#define cy_addr(unit) (p_cy_addr[unit])
static u_int cy_events; /* input chars + weighted output completions */
static void *cy_fast_ih;
static void *cy_slow_ih;
static int cy_timeout;
static int cy_timeouts_until_log;
static struct callout_handle cy_timeout_handle
= CALLOUT_HANDLE_INITIALIZER(&cy_timeout_handle);
#ifdef CyDebug
static u_int cd_inbs;
static u_int cy_inbs;
static u_int cd_outbs;
static u_int cy_outbs;
static u_int cy_svrr_probes;
static u_int cy_timeouts;
#endif
static int cy_chip_offset[] = {
0x0000, 0x0400, 0x0800, 0x0c00, 0x0200, 0x0600, 0x0a00, 0x0e00,
};
static int cy_nr_cd1400s[NCY];
static int cy_total_devices;
#undef RxFifoThreshold
static int volatile RxFifoThreshold = (CD1400_RX_FIFO_SIZE / 2);
int
cy_units(cy_addr cy_iobase, int cy_align)
{
int cyu;
u_char firmware_version;
int i;
cy_addr iobase;
for (cyu = 0; cyu < CY_MAX_CD1400s; ++cyu) {
iobase = cy_iobase + (cy_chip_offset[cyu] << cy_align);
/* wait for chip to become ready for new command */
for (i = 0; i < 10; i++) {
DELAY(50);
if (!cd_inb(iobase, CD1400_CCR, cy_align))
break;
}
/* clear the GFRCR register */
cd_outb(iobase, CD1400_GFRCR, cy_align, 0);
/* issue a reset command */
cd_outb(iobase, CD1400_CCR, cy_align,
CD1400_CCR_CMDRESET | CD1400_CCR_FULLRESET);
/* XXX bogus initialization to avoid a gcc bug/warning. */
firmware_version = 0;
/* wait for the CD1400 to initialize itself */
for (i = 0; i < 200; i++) {
DELAY(50);
/* retrieve firmware version */
firmware_version = cd_inb(iobase, CD1400_GFRCR,
cy_align);
if ((firmware_version & 0xf0) == 0x40)
break;
}
/*
* Anything in the 0x40-0x4F range is fine.
* If one CD1400 is bad then we don't support higher
* numbered good ones on this board.
*/
if ((firmware_version & 0xf0) != 0x40)
break;
}
return (cyu);
}
void *
cyattach_common(cy_addr cy_iobase, int cy_align)
{
int adapter;
int cyu;
u_char firmware_version;
cy_addr iobase;
int ncyu;
int unit;
struct tty *tp;
while (cy_inited != 2)
if (atomic_cmpset_int(&cy_inited, 0, 1)) {
mtx_init(&cy_lock, cy_driver_name, NULL, MTX_SPIN);
atomic_store_rel_int(&cy_inited, 2);
}
adapter = cy_total_devices;
if ((u_int)adapter >= NCY) {
printf(
"cy%d: can't attach adapter: insufficient cy devices configured\n",
adapter);
return (NULL);
}
ncyu = cy_units(cy_iobase, cy_align);
if (ncyu == 0)
return (NULL);
cy_nr_cd1400s[adapter] = ncyu;
cy_total_devices++;
unit = adapter * CY_MAX_PORTS;
for (cyu = 0; cyu < ncyu; ++cyu) {
int cdu;
iobase = (cy_addr) (cy_iobase
+ (cy_chip_offset[cyu] << cy_align));
firmware_version = cd_inb(iobase, CD1400_GFRCR, cy_align);
/* Set up a receive timeout period of than 1+ ms. */
cd_outb(iobase, CD1400_PPR, cy_align,
howmany(CY_CLOCK(firmware_version)
/ CD1400_PPR_PRESCALER, 1000));
for (cdu = 0; cdu < CD1400_NO_OF_CHANNELS; ++cdu, ++unit) {
struct com_s *com;
int s;
com = malloc(sizeof *com, M_DEVBUF, M_NOWAIT | M_ZERO);
if (com == NULL)
break;
com->unit = unit;
com->gfrcr_image = firmware_version;
if (CY_RTS_DTR_SWAPPED(firmware_version)) {
com->mcr_dtr = CD1400_MSVR1_RTS;
com->mcr_rts = CD1400_MSVR2_DTR;
com->mcr_rts_reg = CD1400_MSVR2;
} else {
com->mcr_dtr = CD1400_MSVR2_DTR;
com->mcr_rts = CD1400_MSVR1_RTS;
com->mcr_rts_reg = CD1400_MSVR1;
}
com->obufs[0].l_head = com->obuf1;
com->obufs[1].l_head = com->obuf2;
com->cy_align = cy_align;
com->cy_iobase = cy_iobase;
com->iobase = iobase;
com->car = ~CD1400_CAR_CHAN;
tp = com->tp = ttyalloc();
tp->t_open = cyopen;
tp->t_close = cyclose;
tp->t_oproc = cystart;
tp->t_stop = comstop;
tp->t_param = cyparam;
tp->t_break = cybreak;
tp->t_modem = cymodem;
tp->t_sc = com;
if (cysetwater(com, tp->t_init_in.c_ispeed) != 0) {
free(com, M_DEVBUF);
return (NULL);
}
s = spltty();
cy_addr(unit) = com;
splx(s);
if (cy_fast_ih == NULL) {
swi_add(&tty_intr_event, "cy", cypoll, NULL, SWI_TTY, 0,
&cy_fast_ih);
swi_add(&clk_intr_event, "cy", cypoll, NULL, SWI_CLOCK, 0,
&cy_slow_ih);
}
ttycreate(tp, TS_CALLOUT, "c%r%r",
adapter, unit % CY_MAX_PORTS);
}
}
/* ensure an edge for the next interrupt */
cy_outb(cy_iobase, CY_CLEAR_INTR, cy_align, 0);
return (cy_addr(adapter * CY_MAX_PORTS));
}
static int
cyopen(struct tty *tp, struct cdev *dev)
{
struct com_s *com;
int s;
com = tp->t_sc;
s = spltty();
/*
* We jump to this label after all non-interrupted sleeps to pick
* up any changes of the device state.
*/
/* Encode per-board unit in LIVR for access in intr routines. */
cd_setreg(com, CD1400_LIVR,
(com->unit & CD1400_xIVR_CHAN) << CD1400_xIVR_CHAN_SHIFT);
/*
* Flush fifos. This requires a full channel reset which
* also disables the transmitter and receiver. Recover
* from this.
*/
cd1400_channel_cmd(com,
CD1400_CCR_CMDRESET | CD1400_CCR_CHANRESET);
cd1400_channel_cmd(com, com->channel_control);
critical_enter();
COM_LOCK();
com->prev_modem_status = com->last_modem_status
= cd_getreg(com, CD1400_MSVR2);
cd_setreg(com, CD1400_SRER,
com->intr_enable
= CD1400_SRER_MDMCH | CD1400_SRER_RXDATA);
COM_UNLOCK();
critical_exit();
cysettimeout();
return (0);
}
static void
cyclose(struct tty *tp)
{
cy_addr iobase;
struct com_s *com;
int s;
int unit;
com = tp->t_sc;
unit = com->unit;
iobase = com->iobase;
s = spltty();
/* XXX */
critical_enter();
COM_LOCK();
com->etc = ETC_NONE;
cd_setreg(com, CD1400_COR2, com->cor[1] &= ~CD1400_COR2_ETC);
COM_UNLOCK();
critical_exit();
cd_etc(com, CD1400_ETC_STOPBREAK);
cd1400_channel_cmd(com, CD1400_CCR_CMDRESET | CD1400_CCR_FTF);
{
critical_enter();
COM_LOCK();
cd_setreg(com, CD1400_SRER, com->intr_enable = 0);
COM_UNLOCK();
critical_exit();
tp = com->tp;
if ((tp->t_cflag & HUPCL)
/*
* XXX we will miss any carrier drop between here and the
* next open. Perhaps we should watch DCD even when the
* port is closed; it is not sufficient to check it at
* the next open because it might go up and down while
* we're not watching.
*/
|| (!tp->t_actout
&& !(com->prev_modem_status & CD1400_MSVR2_CD)
&& !(tp->t_init_in.c_cflag & CLOCAL))
|| !(tp->t_state & TS_ISOPEN)) {
(void)cymodem(tp, 0, SER_DTR);
/* Disable receiver (leave transmitter enabled). */
com->channel_control = CD1400_CCR_CMDCHANCTL
| CD1400_CCR_XMTEN
| CD1400_CCR_RCVDIS;
cd1400_channel_cmd(com, com->channel_control);
ttydtrwaitstart(tp);
}
}
tp->t_actout = FALSE;
wakeup(&tp->t_actout);
wakeup(TSA_CARR_ON(tp)); /* restart any wopeners */
splx(s);
}
/*
* This function:
* a) needs to be called with COM_LOCK() held, and
* b) needs to return with COM_LOCK() held.
*/
static void
cyinput(struct com_s *com)
{
u_char *buf;
int incc;
u_char line_status;
int recv_data;
struct tty *tp;
buf = com->ibuf;
tp = com->tp;
if (!(tp->t_state & TS_ISOPEN)) {
cy_events -= (com->iptr - com->ibuf);
com->iptr = com->ibuf;
return;
}
if (tp->t_state & TS_CAN_BYPASS_L_RINT) {
/*
* Avoid the grotesquely inefficient lineswitch routine
* (ttyinput) in "raw" mode. It usually takes about 450
* instructions (that's without canonical processing or echo!).
* slinput is reasonably fast (usually 40 instructions plus
* call overhead).
*/
do {
/*
* This may look odd, but it is using save-and-enable
* semantics instead of the save-and-disable semantics
* that are used everywhere else.
*/
COM_UNLOCK();
critical_exit();
incc = com->iptr - buf;
if (tp->t_rawq.c_cc + incc > tp->t_ihiwat
&& (com->state & CS_RTS_IFLOW
|| tp->t_iflag & IXOFF)
&& !(tp->t_state & TS_TBLOCK))
ttyblock(tp);
com->delta_error_counts[CE_TTY_BUF_OVERFLOW]
+= b_to_q((char *)buf, incc, &tp->t_rawq);
buf += incc;
tk_nin += incc;
tk_rawcc += incc;
tp->t_rawcc += incc;
ttwakeup(tp);
if (tp->t_state & TS_TTSTOP
&& (tp->t_iflag & IXANY
|| tp->t_cc[VSTART] == tp->t_cc[VSTOP])) {
tp->t_state &= ~TS_TTSTOP;
tp->t_lflag &= ~FLUSHO;
cystart(tp);
}
critical_enter();
COM_LOCK();
} while (buf < com->iptr);
} else {
do {
/*
* This may look odd, but it is using save-and-enable
* semantics instead of the save-and-disable semantics
* that are used everywhere else.
*/
COM_UNLOCK();
critical_exit();
line_status = buf[com->ierroff];
recv_data = *buf++;
if (line_status
& (CD1400_RDSR_BREAK | CD1400_RDSR_FE | CD1400_RDSR_OE | CD1400_RDSR_PE)) {
if (line_status & CD1400_RDSR_BREAK)
recv_data |= TTY_BI;
if (line_status & CD1400_RDSR_FE)
recv_data |= TTY_FE;
if (line_status & CD1400_RDSR_OE)
recv_data |= TTY_OE;
if (line_status & CD1400_RDSR_PE)
recv_data |= TTY_PE;
}
ttyld_rint(tp, recv_data);
critical_enter();
COM_LOCK();
} while (buf < com->iptr);
}
cy_events -= (com->iptr - com->ibuf);
com->iptr = com->ibuf;
/*
* There is now room for another low-level buffer full of input,
* so enable RTS if it is now disabled and there is room in the
* high-level buffer.
*/
if ((com->state & CS_RTS_IFLOW) && !(com->mcr_image & com->mcr_rts) &&
!(tp->t_state & TS_TBLOCK))
cd_setreg(com, com->mcr_rts_reg,
com->mcr_image |= com->mcr_rts);
}
int
cyintr(void *vcom)
{
struct com_s *basecom;
int baseu;
int cy_align;
cy_addr cy_iobase;
int cyu;
cy_addr iobase;
u_char status;
int unit;
COM_LOCK(); /* XXX could this be placed down lower in the loop? */
basecom = (struct com_s *)vcom;
baseu = basecom->unit;
cy_align = basecom->cy_align;
cy_iobase = basecom->cy_iobase;
unit = baseu / CY_MAX_PORTS;
/* check each CD1400 in turn */
for (cyu = 0; cyu < cy_nr_cd1400s[unit]; ++cyu) {
iobase = (cy_addr) (cy_iobase
+ (cy_chip_offset[cyu] << cy_align));
/* poll to see if it has any work */
status = cd_inb(iobase, CD1400_SVRR, cy_align);
if (status == 0)
continue; // XXX - FILTER_STRAY?
#ifdef CyDebug
++cy_svrr_probes;
#endif
/* service requests as appropriate, giving priority to RX */
if (status & CD1400_SVRR_RXRDY) {
struct com_s *com;
u_int count;
u_char *ioptr;
u_char line_status;
u_char recv_data;
u_char serv_type;
#ifdef PollMode
u_char save_rir;
#endif
#ifdef PollMode
save_rir = cd_inb(iobase, CD1400_RIR, cy_align);
/* enter rx service */
cd_outb(iobase, CD1400_CAR, cy_align, save_rir);
cy_addr(baseu + cyu * CD1400_NO_OF_CHANNELS)->car
= save_rir & CD1400_CAR_CHAN;
serv_type = cd_inb(iobase, CD1400_RIVR, cy_align);
com = cy_addr(baseu
+ ((serv_type >> CD1400_xIVR_CHAN_SHIFT)
& CD1400_xIVR_CHAN));
#else
/* ack receive service */
serv_type = cy_inb(iobase, CY8_SVCACKR, cy_align);
com = cy_addr(baseu +
+ ((serv_type >> CD1400_xIVR_CHAN_SHIFT)
& CD1400_xIVR_CHAN));
#endif
if (serv_type & CD1400_RIVR_EXCEPTION) {
++com->recv_exception;
line_status = cd_inb(iobase, CD1400_RDSR, cy_align);
/* break/unnattached error bits or real input? */
recv_data = cd_inb(iobase, CD1400_RDSR, cy_align);
#ifndef SOFT_HOTCHAR
if (line_status & CD1400_RDSR_SPECIAL
&& com->tp->t_hotchar != 0)
swi_sched(cy_fast_ih, 0);
#endif
#if 1 /* XXX "intelligent" PFO error handling would break O error handling */
if (line_status & (CD1400_RDSR_PE|CD1400_RDSR_FE|CD1400_RDSR_BREAK)) {
/*
Don't store PE if IGNPAR and BI if IGNBRK,
this hack allows "raw" tty optimization
works even if IGN* is set.
*/
if ( com->tp == NULL
|| !(com->tp->t_state & TS_ISOPEN)
|| ((line_status & (CD1400_RDSR_PE|CD1400_RDSR_FE))
&& (com->tp->t_iflag & IGNPAR))
|| ((line_status & CD1400_RDSR_BREAK)
&& (com->tp->t_iflag & IGNBRK)))
goto cont;
if ( (line_status & (CD1400_RDSR_PE|CD1400_RDSR_FE))
&& (com->tp->t_state & TS_CAN_BYPASS_L_RINT)
&& ((line_status & CD1400_RDSR_FE)
|| ((line_status & CD1400_RDSR_PE)
&& (com->tp->t_iflag & INPCK))))
recv_data = 0;
}
#endif /* 1 */
++com->bytes_in;
#ifdef SOFT_HOTCHAR
if (com->tp->t_hotchar != 0 && recv_data == com->tp->t_hotchar)
swi_sched(cy_fast_ih, 0);
#endif
ioptr = com->iptr;
if (ioptr >= com->ibufend)
CE_RECORD(com, CE_INTERRUPT_BUF_OVERFLOW);
else {
if (com->tp != NULL && com->tp->t_do_timestamp)
microtime(&com->tp->t_timestamp);
++cy_events;
ioptr[0] = recv_data;
ioptr[com->ierroff] = line_status;
com->iptr = ++ioptr;
if (ioptr == com->ihighwater
&& com->state & CS_RTS_IFLOW)
cd_outb(iobase, com->mcr_rts_reg,
cy_align,
com->mcr_image &=
~com->mcr_rts);
if (line_status & CD1400_RDSR_OE)
CE_RECORD(com, CE_OVERRUN);
}
goto cont;
} else {
int ifree;
count = cd_inb(iobase, CD1400_RDCR, cy_align);
if (!count)
goto cont;
com->bytes_in += count;
ioptr = com->iptr;
ifree = com->ibufend - ioptr;
if (count > ifree) {
count -= ifree;
cy_events += ifree;
if (ifree != 0) {
if (com->tp != NULL && com->tp->t_do_timestamp)
microtime(&com->tp->t_timestamp);
do {
recv_data = cd_inb(iobase,
CD1400_RDSR,
cy_align);
#ifdef SOFT_HOTCHAR
if (com->tp->t_hotchar != 0
&& recv_data
== com->tp->t_hotchar)
swi_sched(cy_fast_ih,
0);
#endif
ioptr[0] = recv_data;
ioptr[com->ierroff] = 0;
++ioptr;
} while (--ifree != 0);
}
com->delta_error_counts
[CE_INTERRUPT_BUF_OVERFLOW] += count;
do {
recv_data = cd_inb(iobase, CD1400_RDSR,
cy_align);
#ifdef SOFT_HOTCHAR
if (com->tp->t_hotchar != 0
&& recv_data == com->tp->t_hotchar)
swi_sched(cy_fast_ih, 0);
#endif
} while (--count != 0);
} else {
if (com->tp != NULL && com->tp->t_do_timestamp)
microtime(&com->tp->t_timestamp);
if (ioptr <= com->ihighwater
&& ioptr + count > com->ihighwater
&& com->state & CS_RTS_IFLOW)
cd_outb(iobase, com->mcr_rts_reg,
cy_align,
com->mcr_image
&= ~com->mcr_rts);
cy_events += count;
do {
recv_data = cd_inb(iobase, CD1400_RDSR,
cy_align);
#ifdef SOFT_HOTCHAR
if (com->tp->t_hotchar != 0
&& recv_data == com->tp->t_hotchar)
swi_sched(cy_fast_ih, 0);
#endif
ioptr[0] = recv_data;
ioptr[com->ierroff] = 0;
++ioptr;
} while (--count != 0);
}
com->iptr = ioptr;
}
cont:
/* terminate service context */
#ifdef PollMode
cd_outb(iobase, CD1400_RIR, cy_align,
save_rir
& ~(CD1400_RIR_RDIREQ | CD1400_RIR_RBUSY));
#else
cd_outb(iobase, CD1400_EOSRR, cy_align, 0);
#endif
}
if (status & CD1400_SVRR_MDMCH) {
struct com_s *com;
u_char modem_status;
#ifdef PollMode
u_char save_mir;
#else
u_char vector;
#endif
#ifdef PollMode
save_mir = cd_inb(iobase, CD1400_MIR, cy_align);
/* enter modem service */
cd_outb(iobase, CD1400_CAR, cy_align, save_mir);
cy_addr(baseu + cyu * CD1400_NO_OF_CHANNELS)->car
= save_mir & CD1400_CAR_CHAN;
com = cy_addr(baseu + cyu * CD1400_NO_OF_CHANNELS
+ (save_mir & CD1400_MIR_CHAN));
#else
/* ack modem service */
vector = cy_inb(iobase, CY8_SVCACKM, cy_align);
com = cy_addr(baseu
+ ((vector >> CD1400_xIVR_CHAN_SHIFT)
& CD1400_xIVR_CHAN));
#endif
++com->mdm;
modem_status = cd_inb(iobase, CD1400_MSVR2, cy_align);
if (modem_status != com->last_modem_status) {
/*
* Schedule high level to handle DCD changes. Note
* that we don't use the delta bits anywhere. Some
* UARTs mess them up, and it's easy to remember the
* previous bits and calculate the delta.
*/
com->last_modem_status = modem_status;
if (!(com->state & CS_CHECKMSR)) {
cy_events += LOTS_OF_EVENTS;
com->state |= CS_CHECKMSR;
swi_sched(cy_fast_ih, 0);
}
#ifdef SOFT_CTS_OFLOW
/* handle CTS change immediately for crisp flow ctl */
if (com->state & CS_CTS_OFLOW) {
if (modem_status & CD1400_MSVR2_CTS) {
com->state |= CS_ODEVREADY;
if (com->state >= (CS_BUSY | CS_TTGO
| CS_ODEVREADY)
&& !(com->intr_enable
& CD1400_SRER_TXRDY))
cd_outb(iobase, CD1400_SRER,
cy_align,
com->intr_enable
= com->intr_enable
& ~CD1400_SRER_TXMPTY
| CD1400_SRER_TXRDY);
} else {
com->state &= ~CS_ODEVREADY;
if (com->intr_enable
& CD1400_SRER_TXRDY)
cd_outb(iobase, CD1400_SRER,
cy_align,
com->intr_enable
= com->intr_enable
& ~CD1400_SRER_TXRDY
| CD1400_SRER_TXMPTY);
}
}
#endif
}
/* terminate service context */
#ifdef PollMode
cd_outb(iobase, CD1400_MIR, cy_align,
save_mir
& ~(CD1400_MIR_RDIREQ | CD1400_MIR_RBUSY));
#else
cd_outb(iobase, CD1400_EOSRR, cy_align, 0);
#endif
}
if (status & CD1400_SVRR_TXRDY) {
struct com_s *com;
#ifdef PollMode
u_char save_tir;
#else
u_char vector;
#endif
#ifdef PollMode
save_tir = cd_inb(iobase, CD1400_TIR, cy_align);
/* enter tx service */
cd_outb(iobase, CD1400_CAR, cy_align, save_tir);
cy_addr(baseu + cyu * CD1400_NO_OF_CHANNELS)->car
= save_tir & CD1400_CAR_CHAN;
com = cy_addr(baseu
+ cyu * CD1400_NO_OF_CHANNELS
+ (save_tir & CD1400_TIR_CHAN));
#else
/* ack transmit service */
vector = cy_inb(iobase, CY8_SVCACKT, cy_align);
com = cy_addr(baseu
+ ((vector >> CD1400_xIVR_CHAN_SHIFT)
& CD1400_xIVR_CHAN));
#endif
if (com->etc != ETC_NONE) {
if (com->intr_enable & CD1400_SRER_TXRDY) {
/*
* Here due to sloppy SRER_TXRDY
* enabling. Ignore. Come back when
* tx is empty.
*/
cd_outb(iobase, CD1400_SRER, cy_align,
com->intr_enable
= (com->intr_enable
& ~CD1400_SRER_TXRDY)
| CD1400_SRER_TXMPTY);
goto terminate_tx_service;
}
switch (com->etc) {
case CD1400_ETC_SENDBREAK:
case CD1400_ETC_STOPBREAK:
/*
* Start the command. Come back on
* next tx empty interrupt, hopefully
* after command has been executed.
*/
cd_outb(iobase, CD1400_COR2, cy_align,
com->cor[1] |= CD1400_COR2_ETC);
cd_outb(iobase, CD1400_TDR, cy_align,
CD1400_ETC_CMD);
cd_outb(iobase, CD1400_TDR, cy_align,
com->etc);
if (com->etc == CD1400_ETC_SENDBREAK)
com->etc = ETC_BREAK_STARTING;
else
com->etc = ETC_BREAK_ENDING;
goto terminate_tx_service;
case ETC_BREAK_STARTING:
/*
* BREAK is now on. Continue with
* SRER_TXMPTY processing, hopefully
* don't come back.
*/
com->etc = ETC_BREAK_STARTED;
break;
case ETC_BREAK_STARTED:
/*
* Came back due to sloppy SRER_TXMPTY
* enabling. Hope again.
*/
break;
case ETC_BREAK_ENDING:
/*
* BREAK is now off. Continue with
* SRER_TXMPTY processing and don't
* come back. The SWI handler will
* restart tx interrupts if necessary.
*/
cd_outb(iobase, CD1400_COR2, cy_align,
com->cor[1]
&= ~CD1400_COR2_ETC);
com->etc = ETC_BREAK_ENDED;
if (!(com->state & CS_ODONE)) {
cy_events += LOTS_OF_EVENTS;
com->state |= CS_ODONE;
swi_sched(cy_fast_ih, 0);
}
break;
case ETC_BREAK_ENDED:
/*
* Shouldn't get here. Hope again.
*/
break;
}
}
if (com->intr_enable & CD1400_SRER_TXMPTY) {
if (!(com->extra_state & CSE_ODONE)) {
cy_events += LOTS_OF_EVENTS;
com->extra_state |= CSE_ODONE;
swi_sched(cy_fast_ih, 0);
}
cd_outb(iobase, CD1400_SRER, cy_align,
com->intr_enable
&= ~CD1400_SRER_TXMPTY);
goto terminate_tx_service;
}
if (com->state >= (CS_BUSY | CS_TTGO | CS_ODEVREADY)) {
u_char *ioptr;
u_int ocount;
ioptr = com->obufq.l_head;
ocount = com->obufq.l_tail - ioptr;
if (ocount > CD1400_TX_FIFO_SIZE)
ocount = CD1400_TX_FIFO_SIZE;
com->bytes_out += ocount;
do
cd_outb(iobase, CD1400_TDR, cy_align,
*ioptr++);
while (--ocount != 0);
com->obufq.l_head = ioptr;
if (ioptr >= com->obufq.l_tail) {
struct lbq *qp;
qp = com->obufq.l_next;
qp->l_queued = FALSE;
qp = qp->l_next;
if (qp != NULL) {
com->obufq.l_head = qp->l_head;
com->obufq.l_tail = qp->l_tail;
com->obufq.l_next = qp;
} else {
/* output just completed */
com->state &= ~CS_BUSY;
/*
* The setting of CSE_ODONE may be
* stale here. We currently only
* use it when CS_BUSY is set, and
* fixing it when we clear CS_BUSY
* is easiest.
*/
if (com->extra_state & CSE_ODONE) {
cy_events -= LOTS_OF_EVENTS;
com->extra_state &= ~CSE_ODONE;
}
cd_outb(iobase, CD1400_SRER, cy_align,
com->intr_enable
= (com->intr_enable
& ~CD1400_SRER_TXRDY)
| CD1400_SRER_TXMPTY);
}
if (!(com->state & CS_ODONE)) {
cy_events += LOTS_OF_EVENTS;
com->state |= CS_ODONE;
/* handle at high level ASAP */
swi_sched(cy_fast_ih, 0);
}
}
}
/* terminate service context */
terminate_tx_service:
#ifdef PollMode
cd_outb(iobase, CD1400_TIR, cy_align,
save_tir
& ~(CD1400_TIR_RDIREQ | CD1400_TIR_RBUSY));
#else
cd_outb(iobase, CD1400_EOSRR, cy_align, 0);
#endif
}
}
/* ensure an edge for the next interrupt */
cy_outb(cy_iobase, CY_CLEAR_INTR, cy_align, 0);
swi_sched(cy_slow_ih, SWI_DELAY);
COM_UNLOCK();
return (FILTER_HANDLED);
}
static void
cybreak(struct tty *tp, int sig)
{
struct com_s *com;
com = tp->t_sc;
if (sig)
cd_etc(com, CD1400_ETC_SENDBREAK);
else
cd_etc(com, CD1400_ETC_STOPBREAK);
}
static void
cypoll(void *arg)
{
int unit;
#ifdef CyDebug
++cy_timeouts;
#endif
if (cy_events == 0)
return;
repeat:
for (unit = 0; unit < NPORTS; ++unit) {
struct com_s *com;
int incc;
struct tty *tp;
com = cy_addr(unit);
if (com == NULL)
continue;
tp = com->tp;
if (tp == NULL) {
/*
* XXX forget any events related to closed devices
* (actually never opened devices) so that we don't
* loop.
*/
critical_enter();
COM_LOCK();
incc = com->iptr - com->ibuf;
com->iptr = com->ibuf;
if (com->state & CS_CHECKMSR) {
incc += LOTS_OF_EVENTS;
com->state &= ~CS_CHECKMSR;
}
cy_events -= incc;
COM_UNLOCK();
critical_exit();
if (incc != 0)
log(LOG_DEBUG,
"cy%d: %d events for device with no tp\n",
unit, incc);
continue;
}
if (com->iptr != com->ibuf) {
critical_enter();
COM_LOCK();
cyinput(com);
COM_UNLOCK();
critical_exit();
}
if (com->state & CS_CHECKMSR) {
u_char delta_modem_status;
critical_enter();
COM_LOCK();
cyinput(com);
delta_modem_status = com->last_modem_status
^ com->prev_modem_status;
com->prev_modem_status = com->last_modem_status;
cy_events -= LOTS_OF_EVENTS;
com->state &= ~CS_CHECKMSR;
COM_UNLOCK();
critical_exit();
if (delta_modem_status & CD1400_MSVR2_CD)
ttyld_modem(tp,
com->prev_modem_status & CD1400_MSVR2_CD);
}
if (com->extra_state & CSE_ODONE) {
critical_enter();
COM_LOCK();
cy_events -= LOTS_OF_EVENTS;
com->extra_state &= ~CSE_ODONE;
COM_UNLOCK();
critical_exit();
if (!(com->state & CS_BUSY)) {
tp->t_state &= ~TS_BUSY;
ttwwakeup(com->tp);
}
if (com->etc != ETC_NONE) {
if (com->etc == ETC_BREAK_ENDED)
com->etc = ETC_NONE;
wakeup(&com->etc);
}
}
if (com->state & CS_ODONE) {
critical_enter();
COM_LOCK();
cy_events -= LOTS_OF_EVENTS;
com->state &= ~CS_ODONE;
COM_UNLOCK();
critical_exit();
ttyld_start(tp);
}
if (cy_events == 0)
break;
}
if (cy_events >= LOTS_OF_EVENTS)
goto repeat;
}
static int
cyparam(struct tty *tp, struct termios *t)
{
int bits;
int cflag;
struct com_s *com;
u_char cor_change;
u_long cy_clock;
int idivisor;
int iflag;
int iprescaler;
int itimeout;
int odivisor;
int oprescaler;
u_char opt;
int s;
com = tp->t_sc;
/* check requested parameters */
cy_clock = CY_CLOCK(com->gfrcr_image);
idivisor = cyspeed(t->c_ispeed, cy_clock, &iprescaler);
if (idivisor <= 0)
return (EINVAL);
odivisor = cyspeed(t->c_ospeed != 0 ? t->c_ospeed : tp->t_ospeed,
cy_clock, &oprescaler);
if (odivisor <= 0)
return (EINVAL);
/* parameters are OK, convert them to the com struct and the device */
s = spltty();
if (t->c_ospeed == 0)
(void)cymodem(tp, 0, SER_DTR);
else
(void)cymodem(tp, SER_DTR, 0);
(void) cysetwater(com, t->c_ispeed);
/* XXX we don't actually change the speed atomically. */
cd_setreg(com, CD1400_RBPR, idivisor);
cd_setreg(com, CD1400_RCOR, iprescaler);
cd_setreg(com, CD1400_TBPR, odivisor);
cd_setreg(com, CD1400_TCOR, oprescaler);
/*
* channel control
* receiver enable
* transmitter enable (always set)
*/
cflag = t->c_cflag;
opt = CD1400_CCR_CMDCHANCTL | CD1400_CCR_XMTEN
| (cflag & CREAD ? CD1400_CCR_RCVEN : CD1400_CCR_RCVDIS);
if (opt != com->channel_control) {
com->channel_control = opt;
cd1400_channel_cmd(com, opt);
}
#ifdef Smarts
/* set special chars */
/* XXX if one is _POSIX_VDISABLE, can't use some others */
if (t->c_cc[VSTOP] != _POSIX_VDISABLE)
cd_setreg(com, CD1400_SCHR1, t->c_cc[VSTOP]);
if (t->c_cc[VSTART] != _POSIX_VDISABLE)
cd_setreg(com, CD1400_SCHR2, t->c_cc[VSTART]);
if (t->c_cc[VINTR] != _POSIX_VDISABLE)
cd_setreg(com, CD1400_SCHR3, t->c_cc[VINTR]);
if (t->c_cc[VSUSP] != _POSIX_VDISABLE)
cd_setreg(com, CD1400_SCHR4, t->c_cc[VSUSP]);
#endif
/*
* set channel option register 1 -
* parity mode
* stop bits
* char length
*/
opt = 0;
/* parity */
if (cflag & PARENB) {
if (cflag & PARODD)
opt |= CD1400_COR1_PARODD;
opt |= CD1400_COR1_PARNORMAL;
}
iflag = t->c_iflag;
if (!(iflag & INPCK))
opt |= CD1400_COR1_NOINPCK;
bits = 1 + 1;
/* stop bits */
if (cflag & CSTOPB) {
++bits;
opt |= CD1400_COR1_STOP2;
}
/* char length */
switch (cflag & CSIZE) {
case CS5:
bits += 5;
opt |= CD1400_COR1_CS5;
break;
case CS6:
bits += 6;
opt |= CD1400_COR1_CS6;
break;
case CS7:
bits += 7;
opt |= CD1400_COR1_CS7;
break;
default:
bits += 8;
opt |= CD1400_COR1_CS8;
break;
}
cor_change = 0;
if (opt != com->cor[0]) {
cor_change |= CD1400_CCR_COR1;
cd_setreg(com, CD1400_COR1, com->cor[0] = opt);
}
/*
* Set receive time-out period, normally to max(one char time, 5 ms).
*/
itimeout = howmany(1000 * bits, t->c_ispeed);
#ifdef SOFT_HOTCHAR
#define MIN_RTP 1
#else
#define MIN_RTP 5
#endif
if (itimeout < MIN_RTP)
itimeout = MIN_RTP;
if (!(t->c_lflag & ICANON) && t->c_cc[VMIN] != 0 && t->c_cc[VTIME] != 0
&& t->c_cc[VTIME] * 10 > itimeout)
itimeout = t->c_cc[VTIME] * 10;
if (itimeout > 255)
itimeout = 255;
cd_setreg(com, CD1400_RTPR, itimeout);
/*
* set channel option register 2 -
* flow control
*/
opt = 0;
#ifdef Smarts
if (iflag & IXANY)
opt |= CD1400_COR2_IXANY;
if (iflag & IXOFF)
opt |= CD1400_COR2_IXOFF;
#endif
#ifndef SOFT_CTS_OFLOW
if (cflag & CCTS_OFLOW)
opt |= CD1400_COR2_CCTS_OFLOW;
#endif
critical_enter();
COM_LOCK();
if (opt != com->cor[1]) {
cor_change |= CD1400_CCR_COR2;
cd_setreg(com, CD1400_COR2, com->cor[1] = opt);
}
COM_UNLOCK();
critical_exit();
/*
* set channel option register 3 -
* receiver FIFO interrupt threshold
* flow control
*/
opt = RxFifoThreshold;
#ifdef Smarts
if (t->c_lflag & ICANON)
opt |= CD1400_COR3_SCD34; /* detect INTR & SUSP chars */
if (iflag & IXOFF)
/* detect and transparently handle START and STOP chars */
opt |= CD1400_COR3_FCT | CD1400_COR3_SCD12;
#endif
if (opt != com->cor[2]) {
cor_change |= CD1400_CCR_COR3;
cd_setreg(com, CD1400_COR3, com->cor[2] = opt);
}
/* notify the CD1400 if COR1-3 have changed */
if (cor_change)
cd1400_channel_cmd(com, CD1400_CCR_CMDCORCHG | cor_change);
/*
* set channel option register 4 -
* CR/NL processing
* break processing
* received exception processing
*/
opt = 0;
if (iflag & IGNCR)
opt |= CD1400_COR4_IGNCR;
#ifdef Smarts
/*
* we need a new ttyinput() for this, as we don't want to
* have ICRNL && INLCR being done in both layers, or to have
* synchronisation problems
*/
if (iflag & ICRNL)
opt |= CD1400_COR4_ICRNL;
if (iflag & INLCR)
opt |= CD1400_COR4_INLCR;
#endif
if (iflag & IGNBRK)
opt |= CD1400_COR4_IGNBRK | CD1400_COR4_NOBRKINT;
/*
* The `-ignbrk -brkint parmrk' case is not handled by the hardware,
* so only tell the hardware about -brkint if -parmrk.
*/
if (!(iflag & (BRKINT | PARMRK)))
opt |= CD1400_COR4_NOBRKINT;
#if 0
/* XXX using this "intelligence" breaks reporting of overruns. */
if (iflag & IGNPAR)
opt |= CD1400_COR4_PFO_DISCARD;
else {
if (iflag & PARMRK)
opt |= CD1400_COR4_PFO_ESC;
else
opt |= CD1400_COR4_PFO_NUL;
}
#else
opt |= CD1400_COR4_PFO_EXCEPTION;
#endif
cd_setreg(com, CD1400_COR4, opt);
/*
* set channel option register 5 -
*/
opt = 0;
if (iflag & ISTRIP)
opt |= CD1400_COR5_ISTRIP;
if (t->c_iflag & IEXTEN)
/* enable LNEXT (e.g. ctrl-v quoting) handling */
opt |= CD1400_COR5_LNEXT;
#ifdef Smarts
if (t->c_oflag & ONLCR)
opt |= CD1400_COR5_ONLCR;
if (t->c_oflag & OCRNL)
opt |= CD1400_COR5_OCRNL;
#endif
cd_setreg(com, CD1400_COR5, opt);
/*
* We always generate modem status change interrupts for CD changes.
* Among other things, this is necessary to track TS_CARR_ON for
* pstat to print even when the driver doesn't care. CD changes
* should be rare so interrupts for them are not worth extra code to
* avoid. We avoid interrupts for other modem status changes (except
* for CTS changes when SOFT_CTS_OFLOW is configured) since this is
* simplest and best.
*/
/*
* set modem change option register 1
* generate modem interrupts on which 1 -> 0 input transitions
* also controls auto-DTR output flow-control, which we don't use
*/
opt = CD1400_MCOR1_CDzd;
#ifdef SOFT_CTS_OFLOW
if (cflag & CCTS_OFLOW)
opt |= CD1400_MCOR1_CTSzd;
#endif
cd_setreg(com, CD1400_MCOR1, opt);
/*
* set modem change option register 2
* generate modem interrupts on specific 0 -> 1 input transitions
*/
opt = CD1400_MCOR2_CDod;
#ifdef SOFT_CTS_OFLOW
if (cflag & CCTS_OFLOW)
opt |= CD1400_MCOR2_CTSod;
#endif
cd_setreg(com, CD1400_MCOR2, opt);
/*
* XXX should have done this long ago, but there is too much state
* to change all atomically.
*/
critical_enter();
COM_LOCK();
com->state &= ~CS_TTGO;
if (!(tp->t_state & TS_TTSTOP))
com->state |= CS_TTGO;
if (cflag & CRTS_IFLOW) {
com->state |= CS_RTS_IFLOW;
/*
* If CS_RTS_IFLOW just changed from off to on, the change
* needs to be propagated to CD1400_MSVR1_RTS. This isn't urgent,
* so do it later by calling cystart() instead of repeating
* a lot of code from cystart() here.
*/
} else if (com->state & CS_RTS_IFLOW) {
com->state &= ~CS_RTS_IFLOW;
/*
* CS_RTS_IFLOW just changed from on to off. Force CD1400_MSVR1_RTS
* on here, since cystart() won't do it later.
*/
cd_setreg(com, com->mcr_rts_reg,
com->mcr_image |= com->mcr_rts);
}
/*
* Set up state to handle output flow control.
* XXX - worth handling MDMBUF (DCD) flow control at the lowest level?
* Now has 10+ msec latency, while CTS flow has 50- usec latency.
*/
com->state |= CS_ODEVREADY;
#ifdef SOFT_CTS_OFLOW
com->state &= ~CS_CTS_OFLOW;
if (cflag & CCTS_OFLOW) {
com->state |= CS_CTS_OFLOW;
if (!(com->last_modem_status & CD1400_MSVR2_CTS))
com->state &= ~CS_ODEVREADY;
}
#endif
/* XXX shouldn't call functions while intrs are disabled. */
disc_optim(tp, t, com);
#if 0
/*
* Recover from fiddling with CS_TTGO. We used to call cyintr1()
* unconditionally, but that defeated the careful discarding of
* stale input in cyopen().
*/
if (com->state >= (CS_BUSY | CS_TTGO))
cyintr1(com);
#endif
if (com->state >= (CS_BUSY | CS_TTGO | CS_ODEVREADY)) {
if (!(com->intr_enable & CD1400_SRER_TXRDY))
cd_setreg(com, CD1400_SRER,
com->intr_enable
= (com->intr_enable & ~CD1400_SRER_TXMPTY)
| CD1400_SRER_TXRDY);
} else {
if (com->intr_enable & CD1400_SRER_TXRDY)
cd_setreg(com, CD1400_SRER,
com->intr_enable
= (com->intr_enable & ~CD1400_SRER_TXRDY)
| CD1400_SRER_TXMPTY);
}
COM_UNLOCK();
critical_exit();
splx(s);
cystart(tp);
if (com->ibufold != NULL) {
free(com->ibufold, M_DEVBUF);
com->ibufold = NULL;
}
return (0);
}
static int
cysetwater(struct com_s *com, speed_t speed)
{
int cp4ticks;
u_char *ibuf;
int ibufsize;
struct tty *tp;
/*
* Make the buffer size large enough to handle a softtty interrupt
* latency of about 2 ticks without loss of throughput or data
* (about 3 ticks if input flow control is not used or not honoured,
* but a bit less for CS5-CS7 modes).
*/
cp4ticks = speed / 10 / hz * 4;
for (ibufsize = 128; ibufsize < cp4ticks;)
ibufsize <<= 1;
if (ibufsize == com->ibufsize) {
return (0);
}
/*
* Allocate input buffer. The extra factor of 2 in the size is
* to allow for an error byte for each input byte.
*/
ibuf = malloc(2 * ibufsize, M_DEVBUF, M_NOWAIT);
if (ibuf == NULL) {
return (ENOMEM);
}
/* Initialize non-critical variables. */
com->ibufold = com->ibuf;
com->ibufsize = ibufsize;
tp = com->tp;
if (tp != NULL) {
tp->t_ififosize = 2 * ibufsize;
tp->t_ispeedwat = (speed_t)-1;
tp->t_ospeedwat = (speed_t)-1;
}
/*
* Read current input buffer, if any. Continue with interrupts
* disabled.
*/
critical_enter();
COM_LOCK();
if (com->iptr != com->ibuf)
cyinput(com);
/*-
* Initialize critical variables, including input buffer watermarks.
* The external device is asked to stop sending when the buffer
* exactly reaches high water, or when the high level requests it.
* The high level is notified immediately (rather than at a later
* clock tick) when this watermark is reached.
* The buffer size is chosen so the watermark should almost never
* be reached.
* The low watermark is invisibly 0 since the buffer is always
* emptied all at once.
*/
com->iptr = com->ibuf = ibuf;
com->ibufend = ibuf + ibufsize;
com->ierroff = ibufsize;
com->ihighwater = ibuf + 3 * ibufsize / 4;
COM_UNLOCK();
critical_exit();
return (0);
}
static void
cystart(struct tty *tp)
{
struct com_s *com;
int s;
#ifdef CyDebug
bool_t started;
#endif
com = tp->t_sc;
s = spltty();
#ifdef CyDebug
++com->start_count;
started = FALSE;
#endif
critical_enter();
COM_LOCK();
if (tp->t_state & TS_TTSTOP) {
com->state &= ~CS_TTGO;
if (com->intr_enable & CD1400_SRER_TXRDY)
cd_setreg(com, CD1400_SRER,
com->intr_enable
= (com->intr_enable & ~CD1400_SRER_TXRDY)
| CD1400_SRER_TXMPTY);
} else {
com->state |= CS_TTGO;
if (com->state >= (CS_BUSY | CS_TTGO | CS_ODEVREADY)
&& !(com->intr_enable & CD1400_SRER_TXRDY))
cd_setreg(com, CD1400_SRER,
com->intr_enable
= (com->intr_enable & ~CD1400_SRER_TXMPTY)
| CD1400_SRER_TXRDY);
}
if (tp->t_state & TS_TBLOCK) {
if (com->mcr_image & com->mcr_rts && com->state & CS_RTS_IFLOW)
#if 0
outb(com->modem_ctl_port, com->mcr_image &= ~CD1400_MSVR1_RTS);
#else
cd_setreg(com, com->mcr_rts_reg,
com->mcr_image &= ~com->mcr_rts);
#endif
} else {
if (!(com->mcr_image & com->mcr_rts)
&& com->iptr < com->ihighwater
&& com->state & CS_RTS_IFLOW)
#if 0
outb(com->modem_ctl_port, com->mcr_image |= CD1400_MSVR1_RTS);
#else
cd_setreg(com, com->mcr_rts_reg,
com->mcr_image |= com->mcr_rts);
#endif
}
COM_UNLOCK();
critical_exit();
if (tp->t_state & (TS_TIMEOUT | TS_TTSTOP)) {
ttwwakeup(tp);
splx(s);
return;
}
if (tp->t_outq.c_cc != 0) {
struct lbq *qp;
struct lbq *next;
if (!com->obufs[0].l_queued) {
#ifdef CyDebug
started = TRUE;
#endif
com->obufs[0].l_tail
= com->obuf1 + q_to_b(&tp->t_outq, com->obuf1,
sizeof com->obuf1);
com->obufs[0].l_next = NULL;
com->obufs[0].l_queued = TRUE;
critical_enter();
COM_LOCK();
if (com->state & CS_BUSY) {
qp = com->obufq.l_next;
while ((next = qp->l_next) != NULL)
qp = next;
qp->l_next = &com->obufs[0];
} else {
com->obufq.l_head = com->obufs[0].l_head;
com->obufq.l_tail = com->obufs[0].l_tail;
com->obufq.l_next = &com->obufs[0];
com->state |= CS_BUSY;
if (com->state >= (CS_BUSY | CS_TTGO
| CS_ODEVREADY))
cd_setreg(com, CD1400_SRER,
com->intr_enable
= (com->intr_enable
& ~CD1400_SRER_TXMPTY)
| CD1400_SRER_TXRDY);
}
COM_UNLOCK();
critical_exit();
}
if (tp->t_outq.c_cc != 0 && !com->obufs[1].l_queued) {
#ifdef CyDebug
started = TRUE;
#endif
com->obufs[1].l_tail
= com->obuf2 + q_to_b(&tp->t_outq, com->obuf2,
sizeof com->obuf2);
com->obufs[1].l_next = NULL;
com->obufs[1].l_queued = TRUE;
critical_enter();
COM_LOCK();
if (com->state & CS_BUSY) {
qp = com->obufq.l_next;
while ((next = qp->l_next) != NULL)
qp = next;
qp->l_next = &com->obufs[1];
} else {
com->obufq.l_head = com->obufs[1].l_head;
com->obufq.l_tail = com->obufs[1].l_tail;
com->obufq.l_next = &com->obufs[1];
com->state |= CS_BUSY;
if (com->state >= (CS_BUSY | CS_TTGO
| CS_ODEVREADY))
cd_setreg(com, CD1400_SRER,
com->intr_enable
= (com->intr_enable
& ~CD1400_SRER_TXMPTY)
| CD1400_SRER_TXRDY);
}
COM_UNLOCK();
critical_exit();
}
tp->t_state |= TS_BUSY;
}
#ifdef CyDebug
if (started)
++com->start_real;
#endif
#if 0
critical_enter();
COM_LOCK();
if (com->state >= (CS_BUSY | CS_TTGO))
cyintr1(com); /* fake interrupt to start output */
COM_UNLOCK();
critical_exit();
#endif
ttwwakeup(tp);
splx(s);
}
static void
comstop(struct tty *tp, int rw)
{
struct com_s *com;
bool_t wakeup_etc;
com = tp->t_sc;
wakeup_etc = FALSE;
critical_enter();
COM_LOCK();
if (rw & FWRITE) {
com->obufs[0].l_queued = FALSE;
com->obufs[1].l_queued = FALSE;
if (com->extra_state & CSE_ODONE) {
cy_events -= LOTS_OF_EVENTS;
com->extra_state &= ~CSE_ODONE;
if (com->etc != ETC_NONE) {
if (com->etc == ETC_BREAK_ENDED)
com->etc = ETC_NONE;
wakeup_etc = TRUE;
}
}
com->tp->t_state &= ~TS_BUSY;
if (com->state & CS_ODONE)
cy_events -= LOTS_OF_EVENTS;
com->state &= ~(CS_ODONE | CS_BUSY);
}
if (rw & FREAD) {
/* XXX no way to reset only input fifo. */
cy_events -= (com->iptr - com->ibuf);
com->iptr = com->ibuf;
}
COM_UNLOCK();
critical_exit();
if (wakeup_etc)
wakeup(&com->etc);
if (rw & FWRITE && com->etc == ETC_NONE)
cd1400_channel_cmd(com, CD1400_CCR_CMDRESET | CD1400_CCR_FTF);
cystart(tp);
}
static int
cymodem(struct tty *tp, int sigon, int sigoff)
{
struct com_s *com;
int mcr;
int msr;
com = tp->t_sc;
if (sigon == 0 && sigoff == 0) {
sigon = 0;
mcr = com->mcr_image;
if (mcr & com->mcr_dtr)
sigon |= SER_DTR;
if (mcr & com->mcr_rts)
/* XXX wired on for Cyclom-8Ys */
sigon |= SER_RTS;
/*
* We must read the modem status from the hardware because
* we don't generate modem status change interrupts for all
* changes, so com->prev_modem_status is not guaranteed to
* be up to date. This is safe, unlike for sio, because
* reading the status register doesn't clear pending modem
* status change interrupts.
*/
msr = cd_getreg(com, CD1400_MSVR2);
if (msr & CD1400_MSVR2_CTS)
sigon |= SER_CTS;
if (msr & CD1400_MSVR2_CD)
sigon |= SER_DCD;
if (msr & CD1400_MSVR2_DSR)
sigon |= SER_DSR;
if (msr & CD1400_MSVR2_RI)
/* XXX not connected except for Cyclom-16Y? */
sigon |= SER_RI;
return (sigon);
}
mcr = com->mcr_image;
if (sigon & SER_DTR)
mcr |= com->mcr_dtr;
if (sigoff & SER_DTR)
mcr &= ~com->mcr_dtr;
if (sigon & SER_RTS)
mcr |= com->mcr_rts;
if (sigoff & SER_RTS)
mcr &= ~com->mcr_rts;
critical_enter();
COM_LOCK();
com->mcr_image = mcr;
cd_setreg(com, CD1400_MSVR1, mcr);
cd_setreg(com, CD1400_MSVR2, mcr);
COM_UNLOCK();
critical_exit();
return (0);
}
static void
cysettimeout()
{
struct com_s *com;
bool_t someopen;
int unit;
/*
* Set our timeout period to 1 second if no polled devices are open.
* Otherwise set it to max(1/200, 1/hz).
* Enable timeouts iff some device is open.
*/
untimeout(cywakeup, (void *)NULL, cy_timeout_handle);
cy_timeout = hz;
someopen = FALSE;
for (unit = 0; unit < NPORTS; ++unit) {
com = cy_addr(unit);
if (com != NULL && com->tp != NULL
&& com->tp->t_state & TS_ISOPEN) {
someopen = TRUE;
}
}
if (someopen) {
cy_timeouts_until_log = hz / cy_timeout;
cy_timeout_handle = timeout(cywakeup, (void *)NULL,
cy_timeout);
} else {
/* Flush error messages, if any. */
cy_timeouts_until_log = 1;
cywakeup((void *)NULL);
untimeout(cywakeup, (void *)NULL, cy_timeout_handle);
}
}
static void
cywakeup(void *chan)
{
struct com_s *com;
int unit;
cy_timeout_handle = timeout(cywakeup, (void *)NULL, cy_timeout);
/*
* Check for and log errors, but not too often.
*/
if (--cy_timeouts_until_log > 0)
return;
cy_timeouts_until_log = hz / cy_timeout;
for (unit = 0; unit < NPORTS; ++unit) {
int errnum;
com = cy_addr(unit);
if (com == NULL)
continue;
for (errnum = 0; errnum < CE_NTYPES; ++errnum) {
u_int delta;
u_long total;
critical_enter();
COM_LOCK();
delta = com->delta_error_counts[errnum];
com->delta_error_counts[errnum] = 0;
COM_UNLOCK();
critical_exit();
if (delta == 0)
continue;
total = com->error_counts[errnum] += delta;
log(LOG_ERR, "cy%d: %u more %s%s (total %lu)\n",
unit, delta, error_desc[errnum],
delta == 1 ? "" : "s", total);
}
}
}
static void
disc_optim(struct tty *tp, struct termios *t, struct com_s *com)
{
#ifndef SOFT_HOTCHAR
u_char opt;
#endif
ttyldoptim(tp);
#ifndef SOFT_HOTCHAR
opt = com->cor[2] & ~CD1400_COR3_SCD34;
if (com->tp->t_hotchar != 0) {
cd_setreg(com, CD1400_SCHR3, com->tp->t_hotchar);
cd_setreg(com, CD1400_SCHR4, com->tp->t_hotchar);
opt |= CD1400_COR3_SCD34;
}
if (opt != com->cor[2]) {
cd_setreg(com, CD1400_COR3, com->cor[2] = opt);
cd1400_channel_cmd(com, CD1400_CCR_CMDCORCHG | CD1400_CCR_COR3);
}
#endif
}
#ifdef Smarts
/* standard line discipline input routine */
int
cyinput(int c, struct tty *tp)
{
/* XXX duplicate ttyinput(), but without the IXOFF/IXON/ISTRIP/IPARMRK
* bits, as they are done by the CD1400. Hardly worth the effort,
* given that high-throughput session are raw anyhow.
*/
}
#endif /* Smarts */
static int
cyspeed(speed_t speed, u_long cy_clock, int *prescaler_io)
{
int actual;
int error;
int divider;
int prescaler;
int prescaler_unit;
if (speed == 0)
return (0);
if (speed < 0 || speed > 150000)
return (-1);
/* determine which prescaler to use */
for (prescaler_unit = 4, prescaler = 2048; prescaler_unit;
prescaler_unit--, prescaler >>= 2) {
if (cy_clock / prescaler / speed > 63)
break;
}
divider = (cy_clock / prescaler * 2 / speed + 1) / 2; /* round off */
if (divider > 255)
divider = 255;
actual = cy_clock/prescaler/divider;
/* 10 times error in percent: */
error = ((actual - (long)speed) * 2000 / (long)speed + 1) / 2;
/* 3.0% max error tolerance */
if (error < -30 || error > 30)
return (-1);
*prescaler_io = prescaler_unit;
return (divider);
}
static void
cd1400_channel_cmd(struct com_s *com, int cmd)
{
cd1400_channel_cmd_wait(com);
cd_setreg(com, CD1400_CCR, cmd);
cd1400_channel_cmd_wait(com);
}
static void
cd1400_channel_cmd_wait(struct com_s *com)
{
struct timeval start;
struct timeval tv;
long usec;
if (cd_getreg(com, CD1400_CCR) == 0)
return;
microtime(&start);
for (;;) {
if (cd_getreg(com, CD1400_CCR) == 0)
return;
microtime(&tv);
usec = 1000000 * (tv.tv_sec - start.tv_sec) +
tv.tv_usec - start.tv_usec;
if (usec >= 5000) {
log(LOG_ERR,
"cy%d: channel command timeout (%ld usec)\n",
com->unit, usec);
return;
}
}
}
static void
cd_etc(struct com_s *com, int etc)
{
/*
* We can't change the hardware's ETC state while there are any
* characters in the tx fifo, since those characters would be
* interpreted as commands! Unputting characters from the fifo
* is difficult, so we wait up to 12 character times for the fifo
* to drain. The command will be delayed for up to 2 character
* times for the tx to become empty. Unputting characters from
* the tx holding and shift registers is impossible, so we wait
* for the tx to become empty so that the command is sure to be
* executed soon after we issue it.
*/
critical_enter();
COM_LOCK();
if (com->etc == etc)
goto wait;
if ((etc == CD1400_ETC_SENDBREAK
&& (com->etc == ETC_BREAK_STARTING
|| com->etc == ETC_BREAK_STARTED))
|| (etc == CD1400_ETC_STOPBREAK
&& (com->etc == ETC_BREAK_ENDING || com->etc == ETC_BREAK_ENDED
|| com->etc == ETC_NONE))) {
COM_UNLOCK();
critical_exit();
return;
}
com->etc = etc;
cd_setreg(com, CD1400_SRER,
com->intr_enable
= (com->intr_enable & ~CD1400_SRER_TXRDY) | CD1400_SRER_TXMPTY);
wait:
COM_UNLOCK();
critical_exit();
while (com->etc == etc
&& tsleep(&com->etc, TTIPRI | PCATCH, "cyetc", 0) == 0)
continue;
}
static int
cd_getreg(struct com_s *com, int reg)
{
struct com_s *basecom;
u_char car;
int cy_align;
cy_addr iobase;
#ifdef SMP
int need_unlock;
#endif
int val;
basecom = cy_addr(com->unit & ~(CD1400_NO_OF_CHANNELS - 1));
car = com->unit & CD1400_CAR_CHAN;
cy_align = com->cy_align;
iobase = com->iobase;
critical_enter();
#ifdef SMP
need_unlock = 0;
if (!mtx_owned(&cy_lock)) {
COM_LOCK();
need_unlock = 1;
}
#endif
if (basecom->car != car)
cd_outb(iobase, CD1400_CAR, cy_align, basecom->car = car);
val = cd_inb(iobase, reg, cy_align);
#ifdef SMP
if (need_unlock)
COM_UNLOCK();
#endif
critical_exit();
return (val);
}
static void
cd_setreg(struct com_s *com, int reg, int val)
{
struct com_s *basecom;
u_char car;
int cy_align;
cy_addr iobase;
#ifdef SMP
int need_unlock;
#endif
basecom = cy_addr(com->unit & ~(CD1400_NO_OF_CHANNELS - 1));
car = com->unit & CD1400_CAR_CHAN;
cy_align = com->cy_align;
iobase = com->iobase;
critical_enter();
#ifdef SMP
need_unlock = 0;
if (!mtx_owned(&cy_lock)) {
COM_LOCK();
need_unlock = 1;
}
#endif
if (basecom->car != car)
cd_outb(iobase, CD1400_CAR, cy_align, basecom->car = car);
cd_outb(iobase, reg, cy_align, val);
#ifdef SMP
if (need_unlock)
COM_UNLOCK();
#endif
critical_exit();
}
#ifdef CyDebug
/* useful in ddb */
void
cystatus(int unit)
{
struct com_s *com;
cy_addr iobase;
u_int ocount;
struct tty *tp;
com = cy_addr(unit);
printf("info for channel %d\n", unit);
printf("------------------\n");
printf("total cyclom service probes:\t%d\n", cy_svrr_probes);
printf("calls to upper layer:\t\t%d\n", cy_timeouts);
if (com == NULL)
return;
iobase = com->iobase;
printf("\n");
printf("cd1400 base address:\\tt%p\n", iobase);
printf("saved channel_control:\t\t0x%02x\n", com->channel_control);
printf("saved cor1-3:\t\t\t0x%02x 0x%02x 0x%02x\n",
com->cor[0], com->cor[1], com->cor[2]);
printf("service request enable reg:\t0x%02x (0x%02x cached)\n",
cd_getreg(com, CD1400_SRER), com->intr_enable);
printf("service request register:\t0x%02x\n",
cd_inb(iobase, CD1400_SVRR, com->cy_align));
printf("modem status:\t\t\t0x%02x (0x%02x cached)\n",
cd_getreg(com, CD1400_MSVR2), com->prev_modem_status);
printf("rx/tx/mdm interrupt registers:\t0x%02x 0x%02x 0x%02x\n",
cd_inb(iobase, CD1400_RIR, com->cy_align),
cd_inb(iobase, CD1400_TIR, com->cy_align),
cd_inb(iobase, CD1400_MIR, com->cy_align));
printf("\n");
printf("com state:\t\t\t0x%02x\n", com->state);
printf("calls to cystart():\t\t%d (%d useful)\n",
com->start_count, com->start_real);
printf("rx buffer chars free:\t\t%d\n", com->iptr - com->ibuf);
ocount = 0;
if (com->obufs[0].l_queued)
ocount += com->obufs[0].l_tail - com->obufs[0].l_head;
if (com->obufs[1].l_queued)
ocount += com->obufs[1].l_tail - com->obufs[1].l_head;
printf("tx buffer chars:\t\t%u\n", ocount);
printf("received chars:\t\t\t%d\n", com->bytes_in);
printf("received exceptions:\t\t%d\n", com->recv_exception);
printf("modem signal deltas:\t\t%d\n", com->mdm);
printf("transmitted chars:\t\t%d\n", com->bytes_out);
printf("\n");
tp = com->tp;
if (tp != NULL) {
printf("tty state:\t\t\t0x%08x\n", tp->t_state);
printf(
"upper layer queue lengths:\t%d raw, %d canon, %d output\n",
tp->t_rawq.c_cc, tp->t_canq.c_cc, tp->t_outq.c_cc);
} else
printf("tty state:\t\t\tclosed\n");
}
#endif /* CyDebug */
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