279 lines
7.2 KiB
C
279 lines
7.2 KiB
C
/* $NetBSD: zs_kgdb.c,v 1.9 1996/11/20 18:57:04 gwr Exp $ */
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/*-
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* Copyright (c) 1996 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Gordon W. Ross.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Hooks for kgdb when attached vi the z8530 driver
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* XXX - not tested yet...
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*
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* To use this, build a kernel with: option KGDB, and
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* boot that kernel with "-d". (The kernel will call
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* zs_kgdb_init, kgdb_connect.) When the console prints
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* "kgdb waiting..." you run "gdb -k kernel" and then
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* connect to the remote using: "target remote /dev/ttyX"
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/device.h>
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#include <sys/conf.h>
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#include <sys/ioctl.h>
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#include <sys/kernel.h>
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#include <sys/syslog.h>
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#include <dev/ic/z8530reg.h>
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#include <machine/z8530var.h>
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#include <machine/remote-sl.h>
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/* The Sun3 provides a 4.9152 MHz clock to the ZS chips. */
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#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). */
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struct zschan {
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volatile u_char zc_csr; /* ctrl,status, and indirect access */
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u_char zc_xxx0;
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volatile u_char zc_data; /* data */
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u_char zc_xxx1;
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};
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extern int kgdb_dev;
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extern int kgdb_rate;
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struct zschan * zs_get_chan_addr __P((int zsc_unit, int channel));
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extern int zs_getc __P((void *arg));
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extern void zs_putc __P((void *arg, int c));
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struct zsops zsops_kgdb;
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static u_char zs_kgdb_regs[16] = {
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0, /* 0: CMD (reset, etc.) */
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ZSWR1_RIE, /* NOT: (ZSWR1_TIE | ZSWR1_SIE) */
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0x18 + ZSHARD_PRI, /* IVECT */
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ZSWR3_RX_8 | ZSWR3_RX_ENABLE,
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ZSWR4_CLK_X16 | ZSWR4_ONESB | ZSWR4_EVENP,
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ZSWR5_TX_8 | ZSWR5_TX_ENABLE,
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0, /* 6: TXSYNC/SYNCLO */
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0, /* 7: RXSYNC/SYNCHI */
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0, /* 8: alias for data port */
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ZSWR9_MASTER_IE,
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0, /*10: Misc. TX/RX control bits */
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ZSWR11_TXCLK_BAUD | ZSWR11_RXCLK_BAUD,
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14, /*12: BAUDLO (default=9600) */
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0, /*13: BAUDHI (default=9600) */
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ZSWR14_BAUD_FROM_PCLK | ZSWR14_BAUD_ENA,
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ZSWR15_BREAK_IE | ZSWR15_DCD_IE,
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};
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/*
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* This replaces "zs_reset()" in the sparc driver.
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*/
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static void
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zs_setparam(cs, iena, rate)
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struct zs_chanstate *cs;
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int iena;
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int rate;
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{
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int s, tconst;
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bcopy(zs_kgdb_regs, cs->cs_preg, 16);
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if (iena == 0) {
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cs->cs_preg[1] = 0;
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}
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/* Initialize the speed, etc. */
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tconst = BPS_TO_TCONST(cs->cs_brg_clk, rate);
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cs->cs_preg[5] |= ZSWR5_DTR | ZSWR5_RTS;
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cs->cs_preg[12] = tconst;
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cs->cs_preg[13] = tconst >> 8;
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s = splhigh();
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zs_loadchannelregs(cs);
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splx(s);
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}
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/*
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* Set up for kgdb; called at boot time before configuration.
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* KGDB interrupts will be enabled later when zs0 is configured.
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*/
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void
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zs_kgdb_init()
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{
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struct zs_chanstate cs;
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volatile struct zschan *zc;
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int channel, zsc_unit;
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if (major(kgdb_dev) != ZSTTY_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 = 2 - (kgdb_dev & 2);
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channel = kgdb_dev & 1;
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printf("zs_kgdb_init: attaching zstty%d at %d baud\n",
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channel, kgdb_rate);
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/* Setup temporary chanstate. */
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bzero((caddr_t)&cs, sizeof(cs));
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zc = zs_get_chan_addr(zsc_unit, channel);
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cs.cs_reg_csr = &zc->zc_csr;
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cs.cs_reg_data = &zc->zc_data;
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cs.cs_channel = channel;
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cs.cs_brg_clk = PCLK / 16;
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/* Now set parameters. (interrupts disabled) */
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zs_setparam(&cs, 0, kgdb_rate);
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/* Store the getc/putc functions and arg. */
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kgdb_attach(zs_getc, zs_putc, (void *)zc);
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}
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/*
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* This is a "hook" called by zstty_attach to allow the tty
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* to be "taken over" for exclusive use by kgdb.
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* Return non-zero if this is the kgdb port.
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*
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* Set the speed to kgdb_rate, CS8, etc.
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*/
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int
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zs_check_kgdb(cs, dev)
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struct zs_chanstate *cs;
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int dev;
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{
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int tconst;
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if (dev != kgdb_dev)
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return (0);
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/*
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* Yes, this is the kgdb port. Finish the autoconfig
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* message and set up the port for our exclusive use.
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*/
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printf(" (kgdb)\n");
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cs->cs_private = NULL;
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cs->cs_ops = &zsops_kgdb;
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/* Now set parameters. (interrupts enabled) */
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zs_setparam(&cs, 1, kgdb_rate);
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return (1);
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}
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/*
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* KGDB framing character received: enter kernel debugger. This probably
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* should time out after a few seconds to avoid hanging on spurious input.
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*/
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zskgdb()
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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. */
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kgdb_connect(1);
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}
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/****************************************************************
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* Interface to the lower layer (zscc)
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****************************************************************/
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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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register struct zs_chanstate *cs;
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{
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register u_char c, rr1;
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/* Read the input data ASAP. */
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c = zs_read_data(cs);
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/* Save the status register too. */
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rr1 = zs_read_reg(cs, 1);
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if (rr1 & (ZSRR1_FE | ZSRR1_DO | ZSRR1_PE)) {
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/* Clear the receive error. */
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zs_write_csr(cs, ZSWR0_RESET_ERRORS);
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}
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if (c == FRAME_START) {
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zskgdb();
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} else {
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kgdb_input_lost++;
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}
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}
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static void
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zs_kgdb_txint(cs)
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register struct zs_chanstate *cs;
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{
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register int rr0;
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rr0 = zs_read_csr(cs);
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zs_write_csr(cs, ZSWR0_RESET_TXINT);
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}
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static void
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zs_kgdb_stint(cs)
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register struct zs_chanstate *cs;
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{
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register int rr0;
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rr0 = zs_read_csr(cs);
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zs_write_csr(cs, ZSWR0_RESET_STATUS);
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}
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static void
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zs_kgdb_softint(cs)
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struct zs_chanstate *cs;
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{
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printf("zs_kgdb_softint?\n");
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}
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struct zsops zsops_kgdb = {
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zs_kgdb_rxint, /* receive char available */
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zs_kgdb_stint, /* external/status */
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zs_kgdb_txint, /* xmit buffer empty */
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zs_kgdb_softint, /* process software interrupt */
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};
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