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

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/* $NetBSD: zs_kgdb.c,v 1.13 1999/02/03 20:25:07 mycroft Exp $ */
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/*-
* Copyright (c) 1996 The NetBSD Foundation, Inc.
* All rights reserved.
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*
* This code is derived from software contributed to The NetBSD Foundation
* by Gordon W. Ross.
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*
* 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 NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
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*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
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*/
/*
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* Hooks for kgdb when attached via the z8530 driver
*
* 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
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* "kgdb waiting..." you run "gdb -k kernel" and do:
* (gdb) set remotebaud 19200
* (gdb) target remote /dev/ttyb
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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>
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#include <sys/kgdb.h>
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#include <dev/ic/z8530reg.h>
#include <machine/z8530var.h>
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#include <sun3/dev/zs_cons.h>
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/* The Sun3 provides a 4.9152 MHz clock to the ZS chips. */
#define PCLK (9600 * 512) /* PCLK pin input clock rate */
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#define ZSHARD_PRI 6 /* Wired on the CPU board... */
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#define ZS_DELAY() delay(2)
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/* The layout of this is hardware-dependent (padding, order). */
struct zschan {
volatile u_char zc_csr; /* ctrl,status, and indirect access */
u_char zc_xxx0;
volatile u_char zc_data; /* data */
u_char zc_xxx1;
};
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static void zs_setparam __P((struct zs_chanstate *, int, int));
static void zskgdb __P((struct zs_chanstate *));
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struct zsops zsops_kgdb;
static u_char zs_kgdb_regs[16] = {
0, /* 0: CMD (reset, etc.) */
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0, /* 1: ~(ZSWR1_RIE | ZSWR1_TIE | ZSWR1_SIE) */
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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,
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};
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/*
* This replaces "zs_reset()" in the sparc driver.
*/
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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);
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if (iena) {
cs->cs_preg[1] = ZSWR1_RIE | ZSWR1_SIE;
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}
/* Initialize the speed, etc. */
tconst = BPS_TO_TCONST(cs->cs_brg_clk, rate);
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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);
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}
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/*
* Set up for kgdb; called at boot time before configuration.
* KGDB interrupts will be enabled later when zs0 is configured.
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* Called after cninit(), so printf() etc. works.
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*/
void
zs_kgdb_init()
{
struct zs_chanstate cs;
volatile struct zschan *zc;
int channel, zsc_unit;
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/* printf("zs_kgdb_init: kgdb_dev=0x%x\n", kgdb_dev); */
if (major(kgdb_dev) != zs_major)
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return;
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/* Note: (ttya,ttyb) on zsc1, and (ttyc,ttyd) on zsc0 */
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zsc_unit = (kgdb_dev & 2) ? 0 : 1;
channel = kgdb_dev & 1;
printf("zs_kgdb_init: attaching tty%c at %d baud\n",
'a' + (kgdb_dev & 3), kgdb_rate);
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/* Setup temporary chanstate. */
bzero((caddr_t)&cs, sizeof(cs));
zc = zs_get_chan_addr(zsc_unit, channel);
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if (zc == NULL) {
printf("zs_kgdb_init: zs not mapped.\n");
kgdb_dev = -1;
return;
}
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cs.cs_channel = channel;
cs.cs_brg_clk = PCLK / 16;
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cs.cs_reg_csr = &zc->zc_csr;
cs.cs_reg_data = &zc->zc_data;
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/* 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;
{
if (dev != kgdb_dev)
return (0);
/*
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* Yes, this is port in use by kgdb.
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*/
cs->cs_private = NULL;
cs->cs_ops = &zsops_kgdb;
/* Now set parameters. (interrupts enabled) */
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zs_setparam(cs, 1, kgdb_rate);
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return (1);
}
/*
* KGDB framing character received: enter kernel debugger. This probably
* should time out after a few seconds to avoid hanging on spurious input.
*/
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static void
zskgdb(cs)
struct zs_chanstate *cs;
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{
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int unit = minor(kgdb_dev);
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printf("zstty%d: kgdb interrupt\n", unit);
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/* This will trap into the debugger. */
kgdb_connect(1);
}
/****************************************************************
* Interface to the lower layer (zscc)
****************************************************************/
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static void zs_kgdb_rxint __P((struct zs_chanstate *));
static void zs_kgdb_stint __P((struct zs_chanstate *, int));
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static void zs_kgdb_txint __P((struct zs_chanstate *));
static void zs_kgdb_softint __P((struct zs_chanstate *));
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int kgdb_input_lost;
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static void
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zs_kgdb_rxint(cs)
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struct zs_chanstate *cs;
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{
register u_char c, rr1;
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/*
* First read the status, because reading the received char
* destroys the status of this char.
*/
rr1 = zs_read_reg(cs, 1);
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c = zs_read_data(cs);
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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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}
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if (c == KGDB_START) {
zskgdb(cs);
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} else {
kgdb_input_lost++;
}
}
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static void
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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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}
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static void
zs_kgdb_stint(cs, force)
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register struct zs_chanstate *cs;
int force;
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{
register int rr0;
rr0 = zs_read_csr(cs);
zs_write_csr(cs, ZSWR0_RESET_STATUS);
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/*
* Check here for console break, so that we can abort
* even when interrupts are locking up the machine.
*/
if (rr0 & ZSRR0_BREAK) {
zskgdb(cs);
}
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}
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static void
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zs_kgdb_softint(cs)
struct zs_chanstate *cs;
{
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printf("zs_kgdb_softint?\n");
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}
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 */
};