NetBSD/sys/arch/sun3/dev/zs_kgdb.c

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/*
* Copyright (c) 1994 Gordon W. Ross
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This software was developed by the Computer Systems Engineering group
* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
* contributed to Berkeley.
*
* All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Lawrence Berkeley Laboratory.
*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 THE REGENTS OR CONTRIBUTORS 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.
*
* @(#)zs.c 8.1 (Berkeley) 7/19/93
*/
/*
* Hooks for kgdb when attached vi the z8530 driver
* XXX - not tested yet...
*
* To use this, build a kernel with: option KGDB, and
* boot that kernel with "-d". (The kernel will call
* zs_kgdb_init, kgdb_connect.) When the console prints
* "kgdb waiting..." you run "gdb -k kernel" and then
* connect to the remote using: "target remote /dev/ttyX"
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*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/device.h>
#include <sys/conf.h>
#include <sys/ioctl.h>
#include <sys/kernel.h>
#include <sys/syslog.h>
#include <dev/ic/z8530reg.h>
#include <machine/z8530var.h>
#include <machine/remote-sl.h>
/* The Sun3 provides a 4.9152 MHz clock to the ZS chips. */
#define PCLK (9600 * 512) /* PCLK pin input clock rate */
#define ZS_DELAY() delay(2)
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extern int kgdb_dev;
extern int kgdb_rate;
struct zschan * zs_get_chan_addr __P((int zsc_unit, int channel));
extern int zs_getc __P((void *arg));
extern void zs_putc __P((void *arg, int c));
struct zsops zsops_kgdb;
static u_char zs_kgdb_regs[16] = {
0, /* 0: CMD (reset, etc.) */
ZSWR1_RIE, /* NOT: (ZSWR1_TIE | ZSWR1_SIE) */
0x18 + ZSHARD_PRI, /* IVECT */
ZSWR3_RX_8 | ZSWR3_RX_ENABLE,
ZSWR4_CLK_X16 | ZSWR4_ONESB | ZSWR4_EVENP,
ZSWR5_TX_8 | ZSWR5_TX_ENABLE,
0, /* 6: TXSYNC/SYNCLO */
0, /* 7: RXSYNC/SYNCHI */
0, /* 8: alias for data port */
ZSWR9_MASTER_IE,
0, /*10: Misc. TX/RX control bits */
ZSWR11_TXCLK_BAUD | ZSWR11_RXCLK_BAUD,
14, /*12: BAUDLO (default=9600) */
0, /*13: BAUDHI (default=9600) */
ZSWR14_BAUD_FROM_PCLK | ZSWR14_BAUD_ENA,
ZSWR15_BREAK_IE | ZSWR15_DCD_IE,
};
static void
zs_setparam(cs, iena, rate)
struct zs_chanstate *cs;
int iena;
int rate;
{
int s, tconst;
bcopy(zs_kgdb_regs, cs->cs_preg, 16);
if (iena == 0) {
cs->cs_preg[1] = 0;
}
/* Initialize the speed, etc. */
tconst = BPS_TO_TCONST(cs->cs_pclk_div16, rate);
cs->cs_preg[5] |= ZSWR5_DTR | ZSWR5_RTS;
cs->cs_preg[12] = tconst;
cs->cs_preg[13] = tconst >> 8;
s = splhigh();
zs_loadchannelregs(cs);
splx(s);
/*
* Set up for kgdb; called at boot time before configuration.
* KGDB interrupts will be enabled later when zs0 is configured.
*/
void
zs_kgdb_init()
{
struct zs_chanstate cs;
volatile struct zschan *zc;
int channel, zsc_unit;
if (major(kgdb_dev) != ZSMAJOR)
return;
zsc_unit = 1; /* XXX */
channel = minor(kgdb_dev) & 1;
printf("zs_kgdb_init: attaching zstty%d at %d baud\n",
channel, kgdb_rate);
/* Setup temporary chanstate. */
bzero((caddr_t)&cs, sizeof(cs));
zc = zs_get_chan_addr(zsc_unit, channel);
cs.cs_reg_csr = &zc->zc_csr;
cs.cs_reg_data = &zc->zc_data;
cs.cs_channel = channel;
cs.cs_pclk_div16 = PCLK / 16;
/* Now set parameters. (interrupts disabled) */
zs_setparam(&cs, 0, kgdb_rate);
/* Store the getc/putc functions and arg. */
kgdb_attach(zs_getc, zs_putc, (void *)zc);
}
/*
* This is a "hook" called by zstty_attach to allow the tty
* to be "taken over" for exclusive use by kgdb.
* Return non-zero if this is the kgdb port.
*
* Set the speed to kgdb_rate, CS8, etc.
*/
int
zs_check_kgdb(cs, dev)
struct zs_chanstate *cs;
int dev;
{
int tconst;
if (dev != kgdb_dev)
return (0);
/*
* Yes, this is the kgdb port. Finish the autoconfig
* message and set up the port for our exclusive use.
*/
printf(" (kgdb)\n");
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cs->cs_private = NULL;
cs->cs_ops = &zsops_kgdb;
/* Now set parameters. (interrupts enabled) */
zs_setparam(&cs, 1, kgdb_rate);
return (1);
}
/*
* KGDB framing character received: enter kernel debugger. This probably
* should time out after a few seconds to avoid hanging on spurious input.
*/
zskgdb()
{
unit = minor(kgdb_dev);
printf("zstty%d: kgdb interrupt\n", unit);
/* This will trap into the debugger. */
kgdb_connect(1);
}
/****************************************************************
* Interface to the lower layer (zscc)
****************************************************************/
int kgdb_input_lost;
static int
zs_kgdb_rxint(cs)
register struct zs_chanstate *cs;
{
register u_char c, rr1;
/* Read the input data ASAP. */
c = zs_read_data(cs);
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/* Save the status register too. */
rr1 = zs_read_reg(cs, 1);
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if (rr1 & (ZSRR1_FE | ZSRR1_DO | ZSRR1_PE)) {
/* Clear the receive error. */
zs_write_csr(cs, ZSWR0_RESET_ERRORS);
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}
if (c == FRAME_START) {
zskgdb();
} else {
kgdb_input_lost++;
}
return(0);
}
static int
zs_kgdb_txint(cs)
register struct zs_chanstate *cs;
{
register int rr0;
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rr0 = zs_read_csr(cs);
zs_write_csr(cs, ZSWR0_RESET_TXINT);
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return (0);
}
static int
zs_kgdb_stint(cs)
register struct zs_chanstate *cs;
{
register int rr0;
rr0 = zs_read_csr(cs);
zs_write_csr(cs, ZSWR0_RESET_STATUS);
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return (0);
}
static int
zs_kgdb_softint(cs)
struct zs_chanstate *cs;
{
printf("zs_kgdb_softint?\n");
return (0);
}
struct zsops zsops_kgdb = {
zs_kgdb_rxint, /* receive char available */
zs_kgdb_stint, /* external/status */
zs_kgdb_txint, /* xmit buffer empty */
zs_kgdb_softint, /* process software interrupt */
};