/* $NetBSD: zs.c,v 1.6 2003/01/01 02:23:45 thorpej Exp $ */ /*- * Copyright (c) 1996 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Gordon W. Ross. * * 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. * * 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. */ /* * 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. */ #include "opt_ddb.h" #include "opt_kgdb.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "kbd.h" /* NKBD */ #include "ms.h" /* NMS */ /* * Some warts needed by z8530tty.c - * The default parity REALLY needs to be the same as the PROM uses, * or you can not see messages done with printf during boot-up... */ int zs_def_cflag = (CREAD | CS8 | HUPCL); /* ZS channel used as the console device (if any) */ void *zs_conschan_get, *zs_conschan_put; static u_char zs_init_reg[16] = { 0, /* 0: CMD (reset, etc.) */ 0, /* 1: No interrupts yet. */ #ifdef ZS_INIT_IVECT ZS_INIT_IVECT, /* 2: IVECT */ #else 0, /* 2: IVECT */ #endif 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 */ #ifdef ZS_INIT_IVECT ZSWR9_MASTER_IE, #else ZSWR9_MASTER_IE | ZSWR9_NO_VECTOR, #endif 0, /*10: Misc. TX/RX control bits */ ZSWR11_TXCLK_BAUD | ZSWR11_RXCLK_BAUD, ((PCLK/32)/9600)-2, /*12: BAUDLO (default=9600) */ 0, /*13: BAUDHI (default=9600) */ ZSWR14_BAUD_ENA | ZSWR14_BAUD_FROM_PCLK, ZSWR15_BREAK_IE, }; /* Console ops */ static int zscngetc __P((dev_t)); static void zscnputc __P((dev_t, int)); static void zscnpollc __P((dev_t, int)); struct consdev zs_consdev = { NULL, NULL, zscngetc, zscnputc, zscnpollc, NULL, }; /**************************************************************** * Autoconfig ****************************************************************/ static int zs_print __P((void *, const char *name)); extern struct cfdriver zs_cd; /* Interrupt handlers. */ int zscheckintr __P((void *)); static int zshard __P((void *)); static void zssoft __P((void *)); static int zs_get_speed __P((struct zs_chanstate *)); /* * Attach a found zs. * * USE ROM PROPERTIES port-a-ignore-cd AND port-b-ignore-cd FOR * SOFT CARRIER, AND keyboard PROPERTY FOR KEYBOARD/MOUSE? */ void zs_attach(zsc, zsd, pri) struct zsc_softc *zsc; struct zsdevice *zsd; int pri; { struct zsc_attach_args zsc_args; struct zs_chanstate *cs; int s, channel, softpri = IPL_SOFTSERIAL; if (zsd == NULL) { printf("configuration incomplete\n"); return; } printf(" softpri %d\n", softpri); /* * Initialize software state for each channel. */ for (channel = 0; channel < 2; channel++) { struct zschan *zc; struct device *child; zsc_args.channel = channel; cs = &zsc->zsc_cs_store[channel]; zsc->zsc_cs[channel] = cs; cs->cs_channel = channel; cs->cs_private = NULL; cs->cs_ops = &zsops_null; cs->cs_brg_clk = PCLK / 16; zc = (channel == 0) ? &zsd->zs_chan_a : &zsd->zs_chan_b; zsc_args.consdev = NULL; zsc_args.hwflags = zs_console_flags(zsc->zsc_promunit, zsc->zsc_node, channel); if (zsc_args.hwflags & ZS_HWFLAG_CONSOLE) { zsc_args.hwflags |= ZS_HWFLAG_USE_CONSDEV; zsc_args.consdev = &zs_consdev; } if ((zsc_args.hwflags & ZS_HWFLAG_CONSOLE_INPUT) != 0) { zs_conschan_get = zc; } if ((zsc_args.hwflags & ZS_HWFLAG_CONSOLE_OUTPUT) != 0) { zs_conschan_put = zc; } /* Children need to set cn_dev, etc */ 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); /* XXX: Consult PROM properties for this?! */ cs->cs_defspeed = zs_get_speed(cs); 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 | ZSWR5_RTS; cs->cs_wr5_rts = 0; /* * Clear the master interrupt enable. * The INTENA is common to both channels, * so just do it on the A channel. */ if (channel == 0) { zs_write_reg(cs, 9, 0); } /* * Look for a child driver for this channel. * The child attach will setup the hardware. */ if (!(child = config_found(&zsc->zsc_dev, (void *)&zsc_args, zs_print))) { /* No sub-driver. Just reset it. */ u_char reset = (channel == 0) ? ZSWR9_A_RESET : ZSWR9_B_RESET; s = splzs(); zs_write_reg(cs, 9, reset); splx(s); } #if (NKBD > 0) || (NMS > 0) /* * If this was a zstty it has a keyboard * property on it we need to attach the * sunkbd and sunms line disciplines. */ if (child && (!strcmp(child->dv_cfdata->cf_name, "zstty"))) { struct kbd_ms_tty_attach_args kma; struct zstty_softc { /* The following are the only fields we need here */ struct device zst_dev; struct tty *zst_tty; struct zs_chanstate *zst_cs; } *zst = (struct zstty_softc *)child; struct tty *tp; kma.kmta_tp = tp = zst->zst_tty; if (tp != NULL) { kma.kmta_dev = tp->t_dev; kma.kmta_consdev = zsc_args.consdev; /* Attach 'em if we got 'em. */ switch(zs_peripheral_type(zsc->zsc_promunit, zsc->zsc_node, channel)) { case ZS_PERIPHERAL_SUNKBD: #if (NKBD > 0) kma.kmta_name = "keyboard"; config_found(child, (void *)&kma, NULL); #endif break; case ZS_PERIPHERAL_SUNMS: #if (NMS > 0) kma.kmta_name = "mouse"; config_found(child, (void *)&kma, NULL); #endif break; default: break; } } } #endif } /* * Now safe to install interrupt handlers. Note the arguments * to the interrupt handlers aren't used. Note, we only do this * once since both SCCs interrupt at the same level and vector. */ bus_intr_establish(zsc->zsc_bustag, pri, IPL_SERIAL, 0, zshard, zsc); if (!(zsc->zsc_softintr = softintr_establish(softpri, zssoft, zsc))) panic("zsattach: could not establish soft interrupt"); evcnt_attach_dynamic(&zsc->zsc_intrcnt, EVCNT_TYPE_INTR, NULL, zsc->zsc_dev.dv_xname, "intr"); /* * Set the master interrupt enable and interrupt vector. * (common to both channels, do it on A) */ cs = zsc->zsc_cs[0]; s = splhigh(); /* 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 zs_print(aux, name) 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); } static int zshard(arg) void *arg; { struct zsc_softc *zsc = (struct zsc_softc *)arg; int rr3, rval; rval = 0; while ((rr3 = zsc_intr_hard(zsc))) { /* Count up the interrupts. */ rval |= rr3; zsc->zsc_intrcnt.ev_count++; } if (((zsc->zsc_cs[0] && zsc->zsc_cs[0]->cs_softreq) || (zsc->zsc_cs[1] && zsc->zsc_cs[1]->cs_softreq)) && zsc->zsc_softintr) { softintr_schedule(zsc->zsc_softintr); } return (rval); } int zscheckintr(arg) void *arg; { struct zsc_softc *zsc; int unit, rval; rval = 0; for (unit = 0; unit < zs_cd.cd_ndevs; unit++) { zsc = zs_cd.cd_devs[unit]; if (zsc == NULL) continue; rval = (zshard((void *)zsc) || rval); } return (rval); } /* * We need this only for TTY_DEBUG purposes. */ static void zssoft(arg) void *arg; { struct zsc_softc *zsc = (struct zsc_softc *)arg; int s; /* Make sure we call the tty layer at spltty. */ s = spltty(); (void)zsc_intr_soft(zsc); #ifdef TTY_DEBUG { struct zstty_softc *zst0 = zsc->zsc_cs[0]->cs_private; struct zstty_softc *zst1 = zsc->zsc_cs[1]->cs_private; if (zst0->zst_overflows || zst1->zst_overflows ) { struct trapframe *frame = (struct trapframe *)arg; printf("zs silo overflow from %p\n", (long)frame->tf_pc); } } #endif splx(s); } /* * Compute the current baud rate given a ZS channel. */ static int zs_get_speed(cs) 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)); } /* * MD functions for setting the baud rate and control modes. */ int zs_set_speed(cs, bps) struct zs_chanstate *cs; int bps; /* bits per second */ { int tconst, real_bps; if (bps == 0) return (0); #ifdef DIAGNOSTIC if (cs->cs_brg_clk == 0) panic("zs_set_speed"); #endif tconst = BPS_TO_TCONST(cs->cs_brg_clk, bps); if (tconst < 0) return (EINVAL); /* Convert back to make sure we can do it. */ real_bps = TCONST_TO_BPS(cs->cs_brg_clk, tconst); /* XXX - Allow some tolerance here? */ if (real_bps != bps) return (EINVAL); cs->cs_preg[12] = tconst; cs->cs_preg[13] = tconst >> 8; /* Caller will stuff the pending registers. */ return (0); } int zs_set_modes(cs, cflag) struct zs_chanstate *cs; int cflag; /* bits per second */ { int s; /* * Output hardware flow control on the chip is horrendous: * if carrier detect drops, the receiver is disabled, and if * CTS drops, the transmitter is stoped IN MID CHARACTER! * Therefore, NEVER set the HFC bit, and instead use the * status interrupt to detect CTS changes. */ s = splzs(); cs->cs_rr0_pps = 0; if ((cflag & (CLOCAL | MDMBUF)) != 0) { cs->cs_rr0_dcd = 0; if ((cflag & MDMBUF) == 0) cs->cs_rr0_pps = ZSRR0_DCD; } else cs->cs_rr0_dcd = ZSRR0_DCD; if ((cflag & CRTSCTS) != 0) { cs->cs_wr5_dtr = ZSWR5_DTR; cs->cs_wr5_rts = ZSWR5_RTS; 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 | ZSWR5_RTS; 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. */ u_char zs_read_reg(cs, reg) struct zs_chanstate *cs; u_char reg; { u_char val; *cs->cs_reg_csr = reg; ZS_DELAY(); val = *cs->cs_reg_csr; ZS_DELAY(); return (val); } void zs_write_reg(cs, reg, val) struct zs_chanstate *cs; u_char reg, val; { *cs->cs_reg_csr = reg; ZS_DELAY(); *cs->cs_reg_csr = val; ZS_DELAY(); } u_char zs_read_csr(cs) struct zs_chanstate *cs; { u_char val; val = *cs->cs_reg_csr; ZS_DELAY(); return (val); } void zs_write_csr(cs, val) struct zs_chanstate *cs; u_char val; { *cs->cs_reg_csr = val; ZS_DELAY(); } u_char zs_read_data(cs) struct zs_chanstate *cs; { u_char val; val = *cs->cs_reg_data; ZS_DELAY(); return (val); } void zs_write_data(cs, val) struct zs_chanstate *cs; u_char val; { *cs->cs_reg_data = val; ZS_DELAY(); } /**************************************************************** * Console support functions (Sun 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 ****************************************************************/ extern void Debugger __P((void)); /* * Handle user request to enter kernel debugger. */ void zs_abort(cs) struct zs_chanstate *cs; { volatile struct zschan *zc = zs_conschan_get; int rr0; /* Wait for end of break to avoid PROM abort. */ /* XXX - Limit the wait? */ do { rr0 = zc->zc_csr; ZS_DELAY(); } while (rr0 & ZSRR0_BREAK); #if defined(KGDB) zskgdb(cs); #elif defined(DDB) { extern int db_active; if (!db_active) Debugger(); else /* Debugger is probably hozed */ callrom(); } #else printf("stopping on keyboard abort\n"); callrom(); #endif } /* * Polled input char. */ int zs_getc(arg) void *arg; { volatile struct zschan *zc = arg; int s, c, rr0; s = splhigh(); /* Wait for a character to arrive. */ do { rr0 = zc->zc_csr; ZS_DELAY(); } while ((rr0 & ZSRR0_RX_READY) == 0); c = 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(arg, c) void *arg; int c; { volatile struct zschan *zc = arg; int s, rr0; s = splhigh(); /* Wait for transmitter to become ready. */ do { rr0 = zc->zc_csr; ZS_DELAY(); } while ((rr0 & ZSRR0_TX_READY) == 0); /* * Send the next character. * Now you'd think that this could be followed by a ZS_DELAY() * just like all the other chip accesses, but it turns out that * the `transmit-ready' interrupt isn't de-asserted until * some period of time after the register write completes * (more than a couple instructions). So to avoid stray * interrupts we put in the 2us delay regardless of cpu model. */ zc->zc_data = c; delay(2); splx(s); } /*****************************************************************/ /* * Polled console input putchar. */ static int zscngetc(dev) dev_t dev; { return (zs_getc(zs_conschan_get)); } /* * Polled console output putchar. */ static void zscnputc(dev, c) dev_t dev; int c; { zs_putc(zs_conschan_put, c); } int swallow_zsintrs; static void zscnpollc(dev, on) dev_t dev; int on; { /* * Need to tell zs driver to acknowledge all interrupts or we get * annoying spurious interrupt messages. This is because mucking * with spl() levels during polling does not prevent interrupts from * being generated. */ if (on) swallow_zsintrs++; else swallow_zsintrs--; }