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freebsd-dev/sys/dev/cy/cy.c
Pedro F. Giffuni 057b4402bf sys/dev: extend use of the howmany() macro when available. 
We have a howmany() macro in the <sys/param.h> header that is
convenient to re-use as it makes things easier to read.
2016-04-26 15:03:15 +00:00

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/*-
* cyclades cyclom-y serial driver
* Andrew Herbert <andrew@werple.apana.org.au>, 17 August 1993
*
* 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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