/* $NetBSD: zs.c,v 1.59 2023/09/24 10:59:24 andvar Exp $ */
/*
* Copyright (c) 1996, 1998 Bill Studenmund
* Copyright (c) 1995 Gordon W. Ross
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
/*
* Zilog Z8530 Dual UART driver (machine-dependent part)
*
* Runs two serial lines per chip using slave drivers.
* Plain tty/async lines use the zs_async slave.
* Sun keyboard/mouse uses the zs_kbd/zs_ms slaves.
* Other ports use their own mice & keyboard slaves.
*
* Credits & history:
*
* With NetBSD 1.1, port-mac68k started using a port of the port-sparc
* (port-sun3?) zs.c driver (which was in turn based on code in the
* Berkeley 4.4 Lite release). Bill Studenmund did the port, with
* help from Allen Briggs and Gordon Ross <
[email protected]>. Noud de
* Brouwer field-tested the driver at a local ISP.
*
* Bill Studenmund and Gordon Ross then ported the machine-independent
* z8530 driver to work with port-mac68k. NetBSD 1.2 contained an
* intermediate version (mac68k using a local, patched version of
* the m.i. drivers), with NetBSD 1.3 containing a full version.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: zs.c,v 1.59 2023/09/24 10:59:24 andvar Exp $");
#include "opt_ddb.h"
#include "opt_kgdb.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/device.h>
#include <sys/conf.h>
#include <sys/file.h>
#include <sys/ioctl.h>
#include <sys/tty.h>
#include <sys/time.h>
#include <sys/kernel.h>
#include <sys/syslog.h>
#include <sys/intr.h>
#include <sys/cpu.h>
#ifdef KGDB
#include <sys/kgdb.h>
#endif
#include <dev/cons.h>
#include <dev/ofw/openfirm.h>
#include <powerpc/ofw_cons.h>
#include <dev/ic/z8530reg.h>
#include <machine/z8530var.h>
#include <machine/autoconf.h>
#include <machine/pio.h>
/* Are these in a header file anywhere? */
/* Booter flags interface */
#define ZSMAC_RAW 0x01
#define ZSMAC_LOCALTALK 0x02
/*
* Some warts needed by z8530tty.c -
*/
int zs_def_cflag = (CREAD | CS8 | HUPCL);
/*
* abort detection on console will now timeout after iterating on a loop
* the following # of times. Cheep hack. Also, abort detection is turned
* off after a timeout (i.e. maybe there's not a terminal hooked up).
*/
#define ZSABORT_DELAY 3000000
struct zsdevice {
/* Yes, they are backwards. */
struct zschan zs_chan_b;
struct zschan zs_chan_a;
};
static int zs_defspeed[2] = {
38400, /* ttyZ0 */
38400, /* ttyZ1 */
};
/* console stuff */
void *zs_conschan = 0;
int zs_conschannel = -1;
#ifdef ZS_CONSOLE_ABORT
int zs_cons_canabort = 1;
#else
int zs_cons_canabort = 0;
#endif /* ZS_CONSOLE_ABORT*/
#if PMAC_G5
static void zscn_delayed_init(struct zsdevice *zsd);
#endif
/* device to which the console is attached--if serial. */
/* Mac stuff */
static int zs_get_speed(struct zs_chanstate *);
void zscnprobe(struct consdev *cp);
void zscninit(struct consdev *cp);
int zscngetc(dev_t dev);
void zscnputc(dev_t dev, int c);
#define zscnpollc nullcnpollc
cons_decl(zs);
struct consdev consdev_zs = {
zscnprobe,
zscninit,
zscngetc,
zscnputc,
zscnpollc,
};
/*
* Even though zsparam will set up the clock multiples, etc., we
* still set them here as: 1) mice & keyboards don't use zsparam,
* and 2) the console stuff uses these defaults before device
* attach.
*/
static uint8_t zs_init_reg[16] = {
0, /* 0: CMD (reset, etc.) */
0, /* 1: No interrupts yet. */
0, /* 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,
((PCLK/32)/38400)-2, /*12: BAUDLO (default=38400) */
0, /*13: BAUDHI (default=38400) */
ZSWR14_BAUD_ENA,
ZSWR15_BREAK_IE,
};
/****************************************************************
* Autoconfig
****************************************************************/
/* Definition of the driver for autoconfig. */
static int zsc_match(device_t, cfdata_t, void *);
static void zsc_attach(device_t, device_t, void *);
static int zsc_print(void *, const char *);
CFATTACH_DECL_NEW(zsc, sizeof(struct zsc_softc),
zsc_match, zsc_attach, NULL, NULL);
extern struct cfdriver zsc_cd;
int zsc_attached;
int zshard(void *);
#ifdef ZS_TXDMA
static int zs_txdma_int(void *);
#endif
void zscnprobe(struct consdev *);
void zscninit(struct consdev *);
int zscngetc(dev_t);
void zscnputc(dev_t, int);
void zscnpollc(dev_t, int);
/*
* Is the zs chip present?
*/
static int
zsc_match(device_t parent, cfdata_t cf, void *aux)
{
struct confargs *ca = aux;
if (strcmp(ca->ca_name, "escc") != 0)
return 0;
if (zsc_attached)
return 0;
return 1;
}
/*
* Attach a found zs.
*
* Match slave number to zs unit number, so that misconfiguration will
* not set up the keyboard as ttya, etc.
*/
static void
zsc_attach(device_t parent, device_t self, void *aux)
{
struct zsc_softc *zsc = device_private(self);
struct confargs *ca = aux;
struct zsc_attach_args zsc_args;
volatile struct zschan *zc;
struct xzs_chanstate *xcs;
struct zs_chanstate *cs;
struct zsdevice *zsd;
int channel;
int s, chip, theflags;
int node, intr[2][3];
u_int regs[6];
char intr_xname[INTRDEVNAMEBUF];
zsc_attached = 1;
zsc->zsc_dev = self;
chip = 0;
ca->ca_reg[0] += ca->ca_baseaddr;
zsd = mapiodev(ca->ca_reg[0], ca->ca_reg[1], false);
node = OF_child(ca->ca_node); /* ch-a */
for (channel = 0; channel < 2; channel++) {
if (OF_getprop(node, "AAPL,interrupts",
intr[channel], sizeof(intr[0])) == -1 &&
OF_getprop(node, "interrupts",
intr[channel], sizeof(intr[0])) == -1) {
aprint_error(": cannot find interrupt property\n");
return;
}
if (OF_getprop(node, "reg", regs, sizeof(regs)) < 24) {
aprint_error(": cannot find reg property\n");
return;
}
regs[2] += ca->ca_baseaddr;
regs[4] += ca->ca_baseaddr;
#ifdef ZS_TXDMA
zsc->zsc_txdmareg[channel] = mapiodev(regs[2], regs[3], false);
zsc->zsc_txdmacmd[channel] =
dbdma_alloc(sizeof(dbdma_command_t) * 3, NULL);
memset(zsc->zsc_txdmacmd[channel], 0,
sizeof(dbdma_command_t) * 3);
dbdma_reset(zsc->zsc_txdmareg[channel]);
#endif
node = OF_peer(node); /* ch-b */
}
aprint_normal(" irq %d,%d\n", intr[0][0], intr[1][0]);
#if PMAC_G5
extern struct consdev failsafe_cons;
if (ofwoea_use_serial_console && cn_tab == &failsafe_cons)
zscn_delayed_init(zsd);
#endif
/*
* Initialize software state for each channel.
*/
for (channel = 0; channel < 2; channel++) {
zsc_args.channel = channel;
zsc_args.hwflags = (channel == zs_conschannel ?
ZS_HWFLAG_CONSOLE : 0);
xcs = &zsc->xzsc_xcs_store[channel];
cs = &xcs->xzs_cs;
zsc->zsc_cs[channel] = cs;
zs_lock_init(cs);
cs->cs_channel = channel;
cs->cs_private = NULL;
cs->cs_ops = &zsops_null;
zc = (channel == 0) ? &zsd->zs_chan_a : &zsd->zs_chan_b;
cs->cs_reg_csr = &zc->zc_csr;
cs->cs_reg_data = &zc->zc_data;
memcpy(cs->cs_creg, zs_init_reg, 16);
memcpy(cs->cs_preg, zs_init_reg, 16);
/* Current BAUD rate generator clock. */
cs->cs_brg_clk = PCLK / 16; /* RTxC is 230400*16, so use 230400 */
if (zsc_args.hwflags & ZS_HWFLAG_CONSOLE)
cs->cs_defspeed = zs_get_speed(cs);
else
cs->cs_defspeed = zs_defspeed[channel];
cs->cs_defcflag = zs_def_cflag;
/* Make these correspond to cs_defcflag (-crtscts) */
cs->cs_rr0_dcd = ZSRR0_DCD;
cs->cs_rr0_cts = 0;
cs->cs_wr5_dtr = ZSWR5_DTR;
cs->cs_wr5_rts = 0;
#ifdef __notyet__
cs->cs_slave_type = ZS_SLAVE_NONE;
#endif
/* Define BAUD rate stuff. */
xcs->cs_clocks[0].clk = PCLK;
xcs->cs_clocks[0].flags = ZSC_RTXBRG | ZSC_RTXDIV;
xcs->cs_clocks[1].flags =
ZSC_RTXBRG | ZSC_RTXDIV | ZSC_VARIABLE | ZSC_EXTERN;
xcs->cs_clocks[2].flags = ZSC_TRXDIV | ZSC_VARIABLE;
xcs->cs_clock_count = 3;
if (channel == 0) {
theflags = 0; /*mac68k_machine.modem_flags;*/
/*xcs->cs_clocks[1].clk = mac68k_machine.modem_dcd_clk;*/
/*xcs->cs_clocks[2].clk = mac68k_machine.modem_cts_clk;*/
xcs->cs_clocks[1].clk = 0;
xcs->cs_clocks[2].clk = 0;
} else {
theflags = 0; /*mac68k_machine.print_flags;*/
xcs->cs_clocks[1].flags = ZSC_VARIABLE;
/*
* Yes, we aren't defining ANY clock source enables for the
* printer's DCD clock in. The hardware won't let us
* use it. But a clock will freak out the chip, so we
* let you set it, telling us to bar interrupts on the line.
*/
/*xcs->cs_clocks[1].clk = mac68k_machine.print_dcd_clk;*/
/*xcs->cs_clocks[2].clk = mac68k_machine.print_cts_clk;*/
xcs->cs_clocks[1].clk = 0;
xcs->cs_clocks[2].clk = 0;
}
if (xcs->cs_clocks[1].clk)
zsc_args.hwflags |= ZS_HWFLAG_NO_DCD;
if (xcs->cs_clocks[2].clk)
zsc_args.hwflags |= ZS_HWFLAG_NO_CTS;
/* Set defaults in our "extended" chanstate. */
xcs->cs_csource = 0;
xcs->cs_psource = 0;
xcs->cs_cclk_flag = 0; /* Nothing fancy by default */
xcs->cs_pclk_flag = 0;
if (theflags & ZSMAC_RAW) {
zsc_args.hwflags |= ZS_HWFLAG_RAW;
printf(" (raw defaults)");
}
/*
* XXX - This might be better done with a "stub" driver
* (to replace zstty) that ignores LocalTalk for now.
*/
if (theflags & ZSMAC_LOCALTALK) {
printf(" shielding from LocalTalk");
cs->cs_defspeed = 1;
cs->cs_creg[ZSRR_BAUDLO] = cs->cs_preg[ZSRR_BAUDLO] = 0xff;
cs->cs_creg[ZSRR_BAUDHI] = cs->cs_preg[ZSRR_BAUDHI] = 0xff;
zs_write_reg(cs, ZSRR_BAUDLO, 0xff);
zs_write_reg(cs, ZSRR_BAUDHI, 0xff);
/*
* If we might have LocalTalk, then make sure we have the
* Baud rate low-enough to not do any damage.
*/
}
/*
* We used to disable chip interrupts here, but we now
* do that in zscnprobe, just in case MacOS left the chip on.
*/
xcs->cs_chip = chip;
/* Stash away a copy of the final H/W flags. */
xcs->cs_hwflags = zsc_args.hwflags;
/*
* Look for a child driver for this channel.
* The child attach will setup the hardware.
*/
if (!config_found(self, (void *)&zsc_args, zsc_print,
CFARGS_NONE)) {
/* No sub-driver. Just reset it. */
uint8_t reset = (channel == 0) ?
ZSWR9_A_RESET : ZSWR9_B_RESET;
s = splzs();
zs_write_reg(cs, 9, reset);
splx(s);
}
}
/* XXX - Now safe to install interrupt handlers. */
for (channel = 0; channel < 2; channel++) {
snprintf(intr_xname, sizeof(intr_xname), "%s pio%d",
device_xname(self), channel);
intr_establish_xname(intr[channel][0], IST_EDGE, IPL_TTY,
zshard, zsc, intr_xname);
#ifdef ZS_TXDMA
snprintf(intr_xname, sizeof(intr_xname), "%s dma%d",
device_xname(self), channel);
intr_establish_xname(intr[channel][1], IST_EDGE, IPL_TTY,
zs_txdma_int, (void *)channel, intr_xname);
#endif
}
zsc->zsc_si = softint_establish(SOFTINT_SERIAL,
(void (*)(void *)) zsc_intr_soft, zsc);
/*
* Set the master interrupt enable and interrupt vector.
* (common to both channels, do it on A)
*/
cs = zsc->zsc_cs[0];
s = splzs();
/* interrupt vector */
zs_write_reg(cs, 2, zs_init_reg[2]);
/* master interrupt control (enable) */
zs_write_reg(cs, 9, zs_init_reg[9]);
splx(s);
}
static int
zsc_print(void *aux, const char *name)
{
struct zsc_attach_args *args = aux;
if (name != NULL)
aprint_normal("%s: ", name);
if (args->channel != -1)
aprint_normal(" channel %d", args->channel);
return UNCONF;
}
int
zsmdioctl(struct zs_chanstate *cs, u_long cmd, void *data)
{
switch (cmd) {
default:
return (EPASSTHROUGH);
}
return (0);
}
void
zsmd_setclock(struct zs_chanstate *cs)
{
#ifdef NOTYET
struct xzs_chanstate *xcs = (void *)cs;
if (cs->cs_channel != 0)
return;
/*
* If the new clock has the external bit set, then select the
* external source.
*/
via_set_modem((xcs->cs_pclk_flag & ZSC_EXTERN) ? 1 : 0);
#endif
}
int
zshard(void *arg)
{
struct zsc_softc *zsc;
int rval;
zsc = arg;
rval = zsc_intr_hard(zsc);
if ((zsc->zsc_cs[0]->cs_softreq) || (zsc->zsc_cs[1]->cs_softreq))
softint_schedule(zsc->zsc_si);
return rval;
}
#ifdef ZS_TXDMA
int
zs_txdma_int(void *arg)
{
int ch = (int)arg;
struct zsc_softc *zsc;
struct zs_chanstate *cs;
zsc = device_lookup_private(&zsc_cd, ch);
if (zsc == NULL)
panic("zs_txdma_int");
cs = zsc->zsc_cs[ch];
zstty_txdma_int(cs);
if (cs->cs_softreq)
softint_schedule(zsc->zsc_si);
return 1;
}
void
zs_dma_setup(struct zs_chanstate *cs, void *pa, int len)
{
struct zsc_softc *zsc;
dbdma_command_t *cmdp;
int ch = cs->cs_channel;
zsc = device_lookup_private(&zsc_cd, ch);
cmdp = zsc->zsc_txdmacmd[ch];
DBDMA_BUILD(cmdp, DBDMA_CMD_OUT_LAST, 0, len, kvtop(pa),
DBDMA_INT_ALWAYS, DBDMA_WAIT_NEVER, DBDMA_BRANCH_NEVER);
cmdp++;
DBDMA_BUILD(cmdp, DBDMA_CMD_STOP, 0, 0, 0,
DBDMA_INT_NEVER, DBDMA_WAIT_NEVER, DBDMA_BRANCH_NEVER);
__asm volatile("eieio" ::: "memory");
dbdma_start(zsc->zsc_txdmareg[ch], zsc->zsc_txdmacmd[ch]);
}
#endif
/*
* Compute the current baud rate given a ZS channel.
* XXX Assume internal BRG.
*/
int
zs_get_speed(struct zs_chanstate *cs)
{
int tconst;
tconst = zs_read_reg(cs, 12);
tconst |= zs_read_reg(cs, 13) << 8;
return TCONST_TO_BPS(cs->cs_brg_clk, tconst);
}
#ifndef ZS_TOLERANCE
#define ZS_TOLERANCE 51
/* 5% in tenths of a %, plus 1 so that exactly 5% will be ok. */
#endif
/*
* Search through the signal sources in the channel, and
* pick the best one for the baud rate requested. Return
* a -1 if not achievable in tolerance. Otherwise return 0
* and fill in the values.
*
* This routine draws inspiration from the Atari port's zs.c
* driver in NetBSD 1.1 which did the same type of source switching.
* Tolerance code inspired by comspeed routine in isa/com.c.
*
* By Bill Studenmund, 1996-05-12
*/
int
zs_set_speed(struct zs_chanstate *cs, int bps)
{
struct xzs_chanstate *xcs = (void *) cs;
int i, tc, tc0 = 0, tc1, s, sf = 0;
int src, rate0, rate1, err, tol;
if (bps == 0)
return (0);
src = -1; /* no valid source yet */
tol = ZS_TOLERANCE;
/*
* Step through all the sources and see which one matches
* the best. A source has to match BETTER than tol to be chosen.
* Thus if two sources give the same error, the first one will be
* chosen. Also, allow for the possibility that one source might run
* both the BRG and the direct divider (i.e. RTxC).
*/
for (i = 0; i < xcs->cs_clock_count; i++) {
if (xcs->cs_clocks[i].clk <= 0)
continue; /* skip non-existent or bad clocks */
if (xcs->cs_clocks[i].flags & ZSC_BRG) {
/* check out BRG at /16 */
tc1 = BPS_TO_TCONST(xcs->cs_clocks[i].clk >> 4, bps);
if (tc1 >= 0) {
rate1 = TCONST_TO_BPS(xcs->cs_clocks[i].clk >> 4, tc1);
err = abs(((rate1 - bps)*1000)/bps);
if (err < tol) {
tol = err;
src = i;
sf = xcs->cs_clocks[i].flags & ~ZSC_DIV;
tc0 = tc1;
rate0 = rate1;
}
}
}
if (xcs->cs_clocks[i].flags & ZSC_DIV) {
/*
* Check out either /1, /16, /32, or /64
* Note: for /1, you'd better be using a synchronized
* clock!
*/
int b0 = xcs->cs_clocks[i].clk, e0 = abs(b0-bps);
int b1 = b0 >> 4, e1 = abs(b1-bps);
int b2 = b1 >> 1, e2 = abs(b2-bps);
int b3 = b2 >> 1, e3 = abs(b3-bps);
if (e0 < e1 && e0 < e2 && e0 < e3) {
err = e0;
rate1 = b0;
tc1 = ZSWR4_CLK_X1;
} else if (e0 > e1 && e1 < e2 && e1 < e3) {
err = e1;
rate1 = b1;
tc1 = ZSWR4_CLK_X16;
} else if (e0 > e2 && e1 > e2 && e2 < e3) {
err = e2;
rate1 = b2;
tc1 = ZSWR4_CLK_X32;
} else {
err = e3;
rate1 = b3;
tc1 = ZSWR4_CLK_X64;
}
err = (err * 1000)/bps;
if (err < tol) {
tol = err;
src = i;
sf = xcs->cs_clocks[i].flags & ~ZSC_BRG;
tc0 = tc1;
rate0 = rate1;
}
}
}
#ifdef ZSMACDEBUG
printf("Checking for rate %d. Found source #%d.\n", bps, src);
#endif
if (src == -1)
return (EINVAL); /* no can do */
/*
* The M.I. layer likes to keep cs_brg_clk current, even though
* we are the only ones who should be touching the BRG's rate.
*
* Note: we are assuming that any ZSC_EXTERN signal source comes in
* on the RTxC pin. Correct for the mac68k obio zsc.
*/
if (sf & ZSC_EXTERN)
cs->cs_brg_clk = xcs->cs_clocks[i].clk >> 4;
else
cs->cs_brg_clk = PCLK / 16;
/*
* Now we have a source, so set it up.
*/
s = splzs();
xcs->cs_psource = src;
xcs->cs_pclk_flag = sf;
bps = rate0;
if (sf & ZSC_BRG) {
cs->cs_preg[4] = ZSWR4_CLK_X16;
cs->cs_preg[11]= ZSWR11_RXCLK_BAUD | ZSWR11_TXCLK_BAUD;
if (sf & ZSC_PCLK) {
cs->cs_preg[14] = ZSWR14_BAUD_ENA | ZSWR14_BAUD_FROM_PCLK;
} else {
cs->cs_preg[14] = ZSWR14_BAUD_ENA;
}
tc = tc0;
} else {
cs->cs_preg[4] = tc0;
if (sf & ZSC_RTXDIV) {
cs->cs_preg[11] = ZSWR11_RXCLK_RTXC | ZSWR11_TXCLK_RTXC;
} else {
cs->cs_preg[11] = ZSWR11_RXCLK_TRXC | ZSWR11_TXCLK_TRXC;
}
cs->cs_preg[14]= 0;
tc = 0xffff;
}
/* Set the BAUD rate divisor. */
cs->cs_preg[12] = tc;
cs->cs_preg[13] = tc >> 8;
splx(s);
#ifdef ZSMACDEBUG
printf("Rate is %7d, tc is %7d, source no. %2d, flags %4x\n",
bps, tc, src, sf);
printf("Registers are: 4 %x, 11 %x, 14 %x\n\n",
cs->cs_preg[4], cs->cs_preg[11], cs->cs_preg[14]);
#endif
cs->cs_preg[5] |= ZSWR5_RTS; /* Make sure the drivers are on! */
/* Caller will stuff the pending registers. */
return (0);
}
int
zs_set_modes(struct zs_chanstate *cs, int cflag)
{
struct xzs_chanstate *xcs = (void*)cs;
int s;
/*
* Make sure we don't enable hfc on a signal line we're ignoring.
* As we enable CTS interrupts only if we have CRTSCTS or CDTRCTS,
* this code also effectively turns off ZSWR15_CTS_IE.
*
* Also, disable DCD interrupts if we've been told to ignore
* the DCD pin. Happens on mac68k because the input line for
* DCD can also be used as a clock input. (Just set CLOCAL.)
*
* If someone tries to turn an invalid flow mode on, Just Say No
* (Suggested by gwr)
*/
if ((cflag & CDTRCTS) && (cflag & (CRTSCTS | MDMBUF)))
return (EINVAL);
if (xcs->cs_hwflags & ZS_HWFLAG_NO_DCD) {
if (cflag & MDMBUF)
return (EINVAL);
cflag |= CLOCAL;
}
if ((xcs->cs_hwflags & ZS_HWFLAG_NO_CTS) && (cflag & (CRTSCTS | CDTRCTS)))
return (EINVAL);
/*
* Output hardware flow control on the chip is horrendous:
* if carrier detect drops, the receiver is disabled, and if
* CTS drops, the transmitter is stopped IN MID CHARACTER!
* Therefore, NEVER set the HFC bit, and instead use the
* status interrupt to detect CTS changes.
*/
s = splzs();
if ((cflag & (CLOCAL | MDMBUF)) != 0)
cs->cs_rr0_dcd = 0;
else
cs->cs_rr0_dcd = ZSRR0_DCD;
/*
* The mac hardware only has one output, DTR (HSKo in Mac
* parlance). In HFC mode, we use it for the functions
* typically served by RTS and DTR on other ports, so we
* have to fake the upper layer out some.
*
* CRTSCTS we use CTS as an input which tells us when to shut up.
* We make no effort to shut up the other side of the connection.
* DTR is used to hang up the modem.
*
* In CDTRCTS, we use CTS to tell us to stop, but we use DTR to
* shut up the other side.
*/
if ((cflag & CRTSCTS) != 0) {
cs->cs_wr5_dtr = ZSWR5_DTR;
cs->cs_wr5_rts = 0;
cs->cs_rr0_cts = ZSRR0_CTS;
} else if ((cflag & CDTRCTS) != 0) {
cs->cs_wr5_dtr = 0;
cs->cs_wr5_rts = ZSWR5_DTR;
cs->cs_rr0_cts = ZSRR0_CTS;
} else if ((cflag & MDMBUF) != 0) {
cs->cs_wr5_dtr = 0;
cs->cs_wr5_rts = ZSWR5_DTR;
cs->cs_rr0_cts = ZSRR0_DCD;
} else {
cs->cs_wr5_dtr = ZSWR5_DTR;
cs->cs_wr5_rts = 0;
cs->cs_rr0_cts = 0;
}
splx(s);
/* Caller will stuff the pending registers. */
return (0);
}
/*
* Read or write the chip with suitable delays.
* MacII hardware has the delay built in.
* No need for extra delay. :-) However, some clock-chirped
* macs, or zsc's on serial add-on boards might need it.
*/
#define ZS_DELAY()
uint8_t
zs_read_reg(struct zs_chanstate *cs, uint8_t reg)
{
uint8_t val;
out8(cs->cs_reg_csr, reg);
ZS_DELAY();
val = in8(cs->cs_reg_csr);
ZS_DELAY();
return val;
}
void
zs_write_reg(struct zs_chanstate *cs, uint8_t reg, uint8_t val)
{
out8(cs->cs_reg_csr, reg);
ZS_DELAY();
out8(cs->cs_reg_csr, val);
ZS_DELAY();
}
uint8_t
zs_read_csr(struct zs_chanstate *cs)
{
uint8_t val;
val = in8(cs->cs_reg_csr);
ZS_DELAY();
/* make up for the fact CTS is wired backwards */
val ^= ZSRR0_CTS;
return val;
}
void
zs_write_csr(struct zs_chanstate *cs, uint8_t val)
{
/* Note, the csr does not write CTS... */
out8(cs->cs_reg_csr, val);
ZS_DELAY();
}
uint8_t
zs_read_data(struct zs_chanstate *cs)
{
uint8_t val;
val = in8(cs->cs_reg_data);
ZS_DELAY();
return val;
}
void
zs_write_data(struct zs_chanstate *cs, uint8_t val)
{
out8(cs->cs_reg_data, val);
ZS_DELAY();
}
/****************************************************************
* Console support functions (powermac specific!)
* Note: this code is allowed to know about the layout of
* the chip registers, and uses that to keep things simple.
* XXX - I think I like the mvme167 code better. -gwr
* XXX - Well :-P :-) -wrs
****************************************************************/
static int stdin, stdout;
/*
* Console functions.
*/
/*
* zscnprobe is the routine which gets called as the kernel is trying to
* figure out where the console should be. Each io driver which might
* be the console (as defined in mac68k/conf.c) gets probed. The probe
* fills in the consdev structure. Important parts are the device #,
* and the console priority. Values are CN_DEAD (don't touch me),
* CN_NORMAL (I'm here, but elsewhere might be better), CN_INTERNAL
* (the video, better than CN_NORMAL), and CN_REMOTE (pick me!)
*
* As the mac's a bit different, we do extra work here. We mainly check
* to see if we have serial echo going on. Also chould check for default
* speeds.
*/
/*
* Polled input char.
*/
int
zs_getc(void *v)
{
volatile struct zschan *zc = v;
int s, c, rr0;
s = splhigh();
/* Wait for a character to arrive. */
do {
rr0 = in8(&zc->zc_csr);
ZS_DELAY();
} while ((rr0 & ZSRR0_RX_READY) == 0);
c = in8(&zc->zc_data);
ZS_DELAY();
splx(s);
/*
* This is used by the kd driver to read scan codes,
* so don't translate '\r' ==> '\n' here...
*/
return (c);
}
/*
* Polled output char.
*/
void
zs_putc(void *v, int c)
{
volatile struct zschan *zc = v;
int s, rr0;
long wait = 0;
s = splhigh();
/* Wait for transmitter to become ready. */
do {
rr0 = in8(&zc->zc_csr);
ZS_DELAY();
} while (((rr0 & ZSRR0_TX_READY) == 0) && (wait++ < 1000000));
if ((rr0 & ZSRR0_TX_READY) != 0) {
out8(&zc->zc_data, c);
ZS_DELAY();
}
splx(s);
}
/*
* Polled console input putchar.
*/
int
zscngetc(dev_t dev)
{
volatile struct zschan *zc = zs_conschan;
int c;
if (zc) {
c = zs_getc(__UNVOLATILE(zc));
} else {
char ch = 0;
OF_read(stdin, &ch, 1);
c = ch;
}
return c;
}
/*
* Polled console output putchar.
*/
void
zscnputc(dev_t dev, int c)
{
volatile struct zschan *zc = zs_conschan;
if (zc) {
zs_putc(__UNVOLATILE(zc), c);
} else {
char ch = c;
OF_write(stdout, &ch, 1);
}
}
/*
* Handle user request to enter kernel debugger.
*/
void
zs_abort(struct zs_chanstate *cs)
{
volatile struct zschan *zc = zs_conschan;
int rr0;
long wait = 0;
if (zs_cons_canabort == 0)
return;
/* Wait for end of break to avoid PROM abort. */
do {
rr0 = in8(&zc->zc_csr);
ZS_DELAY();
} while ((rr0 & ZSRR0_BREAK) && (wait++ < ZSABORT_DELAY));
if (wait > ZSABORT_DELAY) {
zs_cons_canabort = 0;
/* If we time out, turn off the abort ability! */
}
#if defined(KGDB)
kgdb_connect(1);
#elif defined(DDB)
Debugger();
#endif
}
void
zscnprobe(struct consdev *cp)
{
int chosen, pkg;
char name[16];
if ((chosen = OF_finddevice("/chosen")) == -1)
return;
if (OF_getprop(chosen, "stdin", &stdin, sizeof(stdin)) == -1)
return;
if (OF_getprop(chosen, "stdout", &stdout, sizeof(stdout)) == -1)
return;
if ((pkg = OF_instance_to_package(stdin)) == -1)
return;
memset(name, 0, sizeof(name));
if (OF_getprop(pkg, "device_type", name, sizeof(name)) == -1)
return;
if (strcmp(name, "serial") != 0)
return;
memset(name, 0, sizeof(name));
if (OF_getprop(pkg, "name", name, sizeof(name)) == -1)
return;
cp->cn_pri = CN_REMOTE;
}
void
zscninit(struct consdev *cp)
{
int escc, escc_ch, obio, zs_offset;
u_int32_t reg[5];
char name[16];
if ((escc_ch = OF_instance_to_package(stdin)) == -1)
return;
memset(name, 0, sizeof(name));
if (OF_getprop(escc_ch, "name", name, sizeof(name)) == -1)
return;
zs_conschannel = strcmp(name, "ch-b") == 0;
if (OF_getprop(escc_ch, "reg", reg, sizeof(reg)) < 4)
return;
zs_offset = reg[0];
escc = OF_parent(escc_ch);
obio = OF_parent(escc);
if (OF_getprop(obio, "assigned-addresses", reg, sizeof(reg)) < 12)
return;
zs_conschan = (void *)(reg[2] + zs_offset);
}
#if PMAC_G5
/*
* Do a delayed (now that the device is properly mapped) init of the
* global zs console state, basically the equivalent of calling
* zscnprobe(&consdev_zs); zscninit(&consdev_zs);
* but with the mapped address of the device passed in as zsd.
*/
static void
zscn_delayed_init(struct zsdevice *zsd)
{
int chosen, escc_ch;
char name[16];
if ((chosen = OF_finddevice("/chosen")) == -1)
return;
if (OF_getprop(chosen, "stdin", &stdin, sizeof(stdin)) == -1)
return;
if (OF_getprop(chosen, "stdout", &stdout, sizeof(stdout)) == -1)
return;
if ((escc_ch = OF_instance_to_package(stdin)) == -1)
return;
memset(name, 0, sizeof(name));
if (OF_getprop(escc_ch, "name", name, sizeof(name)) == -1)
return;
zs_conschannel = strcmp(name, "ch-b") == 0;
zs_conschan = (zs_conschannel == 0) ?
&zsd->zs_chan_a :
&zsd->zs_chan_b;
cn_tab = &consdev_zs;
}
#endif
