/* $NetBSD: zs_ioasic.c,v 1.12 2000/06/03 20:47:41 thorpej Exp $ */ /*- * Copyright (c) 1996, 1998 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Gordon W. Ross, Ken Hornstein, and by Jason R. Thorpe of the * Numerical Aerospace Simulation Facility, NASA Ames Research Center. * * 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. */ #include /* RCS ID & Copyright macro defns */ __KERNEL_RCSID(0, "$NetBSD: zs_ioasic.c,v 1.12 2000/06/03 20:47:41 thorpej Exp $"); /* * Zilog Z8530 Dual UART driver (machine-dependent part). This driver * handles Z8530 chips attached to the Alpha IOASIC. Modified for * NetBSD/alpha by Ken Hornstein and Jason R. Thorpe. * * Runs two serial lines per chip using slave drivers. * Plain tty/async lines use the zstty slave. */ #include "opt_ddb.h" #include "opt_dec_3000_300.h" #include "opt_zs_ioasic_dma.h" #include "zskbd.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #if 1 #define SPARSE #endif /* * Helpers for console support. */ int zs_ioasic_cngetc __P((dev_t)); void zs_ioasic_cnputc __P((dev_t, int)); void zs_ioasic_cnpollc __P((dev_t, int)); struct consdev zs_ioasic_cons = { NULL, NULL, zs_ioasic_cngetc, zs_ioasic_cnputc, zs_ioasic_cnpollc, NULL, NODEV, CN_NORMAL, }; tc_offset_t zs_ioasic_console_offset; int zs_ioasic_console_channel; int zs_ioasic_console; int zs_ioasic_isconsole __P((tc_offset_t, int)); struct zs_chanstate zs_ioasic_conschanstate_store; struct zs_chanstate *zs_ioasic_conschanstate; int zs_getc __P((struct zs_chanstate *)); void zs_putc __P((struct zs_chanstate *, int)); void zs_ioasic_cninit __P((tc_addr_t, tc_offset_t, int)); /* * Some warts needed by z8530tty.c */ int zs_def_cflag = (TTYDEF_CFLAG & ~(CSIZE | PARENB)) | CS8; int zs_major = 15; /* * The Alpha provides a 7.372 MHz clock to the ZS chips. */ #define PCLK (9600 * 768) /* PCLK pin input clock rate */ /* The layout of this is hardware-dependent (padding, order). */ struct zshan { volatile u_int zc_csr; /* ctrl,status, and indirect access */ #ifdef SPARSE u_int zc_pad0; #endif volatile u_int zc_data; /* data */ #ifdef SPARSE u_int sc_pad1; #endif }; struct zsdevice { /* Yes, they are backwards. */ struct zshan zs_chan_b; struct zshan zs_chan_a; }; static u_char zs_ioasic_init_reg[16] = { 0, /* 0: CMD (reset, etc.) */ 0, /* 1: No interrupts yet. */ 0xf0, /* 2: IVECT */ ZSWR3_RX_8 | ZSWR3_RX_ENABLE, ZSWR4_CLK_X16 | ZSWR4_ONESB, ZSWR5_TX_8 | ZSWR5_TX_ENABLE, 0, /* 6: TXSYNC/SYNCLO */ 0, /* 7: RXSYNC/SYNCHI */ 0, /* 8: alias for data port */ ZSWR9_MASTER_IE | ZSWR9_VECTOR_INCL_STAT, 0, /*10: Misc. TX/RX control bits */ ZSWR11_TXCLK_BAUD | ZSWR11_RXCLK_BAUD, 22, /*12: BAUDLO (default=9600) */ 0, /*13: BAUDHI (default=9600) */ ZSWR14_BAUD_ENA | ZSWR14_BAUD_FROM_PCLK, ZSWR15_BREAK_IE, }; struct zshan *zs_ioasic_get_chan_addr __P((tc_addr_t, int)); struct zshan * zs_ioasic_get_chan_addr(zsaddr, channel) tc_addr_t zsaddr; int channel; { struct zsdevice *addr; struct zshan *zc; addr = (struct zsdevice *) zsaddr; #ifdef SPARSE addr = (struct zsdevice *) TC_DENSE_TO_SPARSE((tc_addr_t) addr); #endif if (channel == 0) zc = &addr->zs_chan_a; else zc = &addr->zs_chan_b; return (zc); } /**************************************************************** * Autoconfig ****************************************************************/ /* Definition of the driver for autoconfig. */ int zs_ioasic_match __P((struct device *, struct cfdata *, void *)); void zs_ioasic_attach __P((struct device *, struct device *, void *)); int zs_ioasic_print __P((void *, const char *name)); struct cfattach zsc_ioasic_ca = { sizeof(struct zsc_softc), zs_ioasic_match, zs_ioasic_attach }; /* Interrupt handlers. */ int zs_ioasic_hardintr __P((void *)); void zs_ioasic_softintr __P((void *)); /* Misc. */ void zs_ioasic_enable __P((int)); extern struct cfdriver ioasic_cd; extern struct cfdriver zsc_cd; /* * Is the zs chip present? */ int zs_ioasic_match(parent, cf, aux) struct device *parent; struct cfdata *cf; void *aux; { struct ioasicdev_attach_args *d = aux; void *zs_addr; if (parent->dv_cfdata->cf_driver != &ioasic_cd) return (0); /* * Make sure that we're looking for the right kind of device. */ if (strncmp(d->iada_modname, "z8530 ", TC_ROM_LLEN) != 0 && strncmp(d->iada_modname, "scc", TC_ROM_LLEN) != 0) return (0); /* * Check user-specified offset against the ioasic offset. * Allow it to be wildcarded. */ if (cf->cf_loc[IOASICCF_OFFSET] != IOASICCF_OFFSET_DEFAULT && cf->cf_loc[IOASICCF_OFFSET] != d->iada_offset) return (0); /* * Find out the device address, and check it for validity. */ zs_addr = (void *) d->iada_addr; #ifdef SPARSE zs_addr = (void *) TC_DENSE_TO_SPARSE((tc_addr_t) zs_addr); #endif if (tc_badaddr(zs_addr)) return (0); return (1); } /* * Attach a found zs. */ void zs_ioasic_attach(parent, self, aux) struct device *parent; struct device *self; void *aux; { struct zsc_softc *zs = (void *) self; struct zsc_attach_args zs_args; struct zs_chanstate *cs; struct ioasicdev_attach_args *d = aux; volatile struct zshan *zc; tc_addr_t zs_addr; int s, channel; printf("\n"); /* * Initialize software state for each channel. */ for (channel = 0; channel < 2; channel++) { zs_args.channel = channel; zs_args.hwflags = 0; cs = &zs->zsc_cs_store[channel]; zs->zsc_cs[channel] = cs; /* * If we're the console, copy the channel state, and * adjust the console channel pointer. */ if (zs_ioasic_isconsole(d->iada_offset, channel)) { bcopy(zs_ioasic_conschanstate, cs, sizeof(struct zs_chanstate)); zs_ioasic_conschanstate = cs; zs_args.hwflags |= ZS_HWFLAG_CONSOLE; } else { zs_addr = d->iada_addr; zc = zs_ioasic_get_chan_addr(zs_addr, channel); cs->cs_reg_csr = (volatile u_char *)&zc->zc_csr; cs->cs_reg_data = (volatile u_char *)&zc->zc_data; bcopy(zs_ioasic_init_reg, cs->cs_creg, 16); bcopy(zs_ioasic_init_reg, cs->cs_preg, 16); cs->cs_defcflag = zs_def_cflag; cs->cs_defspeed = 9600; /* XXX */ (void) zs_set_modes(cs, cs->cs_defcflag); } cs->cs_channel = channel; cs->cs_ops = &zsops_null; cs->cs_brg_clk = PCLK / 16; /* * DCD and CTS interrupts are only meaningful on * SCC 0/B. * * XXX This is sorta gross. */ if (d->iada_offset == 0x00100000 && channel == 1) (u_long)cs->cs_private = ZIP_FLAGS_DCDCTS; else cs->cs_private = NULL; /* * 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); } #ifdef notyet /* XXX thorpej */ /* * Set up the flow/modem control channel pointer to * deal with the weird wiring on the TC Alpha and * DECstation. */ if (channel == 1) cs->cs_ctl_chan = zs->zsc_cs[0]; else cs->cs_ctl_chan = NULL; #endif /* * Look for a child driver for this channel. * The child attach will setup the hardware. */ if (config_found(self, (void *)&zs_args, zs_ioasic_print) == NULL) { /* No sub-driver. Just reset it. */ u_char reset = (channel == 0) ? ZSWR9_A_RESET : ZSWR9_B_RESET; s = splhigh(); zs_write_reg(cs, 9, reset); splx(s); } } /* * Set up the ioasic interrupt handler. */ ioasic_intr_establish(parent, d->iada_cookie, TC_IPL_TTY, zs_ioasic_hardintr, zs); zs->zsc_sih = softintr_establish(IPL_SOFTSERIAL, zs_ioasic_softintr, zs); if (zs->zsc_sih == NULL) panic("zs_ioasic_attach: unable to register softintr"); /* * Set the master interrupt enable and interrupt vector. The * Sun does this only on one channel. The old Alpha SCC driver * did it on both. We'll do it on both. */ s = splhigh(); /* interrupt vector */ zs_write_reg(zs->zsc_cs[0], 2, zs_ioasic_init_reg[2]); zs_write_reg(zs->zsc_cs[1], 2, zs_ioasic_init_reg[2]); /* master interrupt control (enable) */ zs_write_reg(zs->zsc_cs[0], 9, zs_ioasic_init_reg[9]); zs_write_reg(zs->zsc_cs[1], 9, zs_ioasic_init_reg[9]); /* ioasic interrupt enable */ zs_ioasic_enable(1); splx(s); } int zs_ioasic_print(aux, name) void *aux; const char *name; { struct zsc_attach_args *args = aux; if (name != NULL) printf("%s:", name); if (args->channel != -1) printf(" channel %d", args->channel); return (UNCONF); } /* * Enable the SCC interrupts in the ioasic. */ void zs_ioasic_enable(onoff) int onoff; { if (onoff) { *(volatile u_int *)(ioasic_base + IOASIC_IMSK) |= IOASIC_INTR_SCC_1 | IOASIC_INTR_SCC_0; #if !defined(DEC_3000_300) && defined(ZS_IOASIC_DMA) *(volatile u_int *)(ioasic_base + IOASIC_CSR) |= IOASIC_CSR_DMAEN_T1 | IOASIC_CSR_DMAEN_R1 | IOASIC_CSR_DMAEN_T2 | IOASIC_CSR_DMAEN_R2; #endif } else { *(volatile u_int *)(ioasic_base + IOASIC_IMSK) &= ~(IOASIC_INTR_SCC_1 | IOASIC_INTR_SCC_0); #if !defined(DEC_3000_300) && defined(ZS_IOASIC_DMA) *(volatile u_int *)(ioasic_base + IOASIC_CSR) &= ~(IOASIC_CSR_DMAEN_T1 | IOASIC_CSR_DMAEN_R1 | IOASIC_CSR_DMAEN_T2 | IOASIC_CSR_DMAEN_R2); #endif } tc_mb(); } /* * Hardware interrupt handler. */ int zs_ioasic_hardintr(arg) void *arg; { struct zsc_softc *zsc = arg; /* * Call the upper-level MI hardware interrupt handler. */ zsc_intr_hard(zsc); /* * Check to see if we need to schedule any software-level * processing interrupts. */ if (zsc->zsc_cs[0]->cs_softreq | zsc->zsc_cs[1]->cs_softreq) softintr_schedule(zsc->zsc_sih); return (1); } /* * Software-level interrupt (character processing, lower priority). */ void zs_ioasic_softintr(arg) void *arg; { struct zsc_softc *zsc = arg; int s; s = spltty(); (void) zsc_intr_soft(zsc); splx(s); } /* * 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 */ { u_long privflags = (u_long)cs->cs_private; 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(); if ((cflag & (CLOCAL | MDMBUF)) != 0) cs->cs_rr0_dcd = 0; 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; } if ((privflags & ZIP_FLAGS_DCDCTS) == 0) { cs->cs_rr0_dcd &= ~(ZSRR0_CTS|ZSRR0_DCD); cs->cs_rr0_cts &= ~(ZSRR0_CTS|ZSRR0_DCD); } 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; *((volatile unsigned int *) cs->cs_reg_csr) = ((volatile unsigned int) reg) << 8; tc_mb(); DELAY(5); val = ((*(volatile unsigned int *) cs->cs_reg_csr) >> 8) & 0xff; tc_mb(); DELAY(5); return (val); } void zs_write_reg(cs, reg, val) struct zs_chanstate *cs; u_char reg, val; { *((volatile unsigned int *) cs->cs_reg_csr) = ((volatile unsigned int) reg) << 8; tc_mb(); DELAY(5); *((volatile unsigned int *) cs->cs_reg_csr) = ((volatile unsigned int) val) << 8; tc_mb(); DELAY(5); } u_char zs_read_csr(cs) struct zs_chanstate *cs; { register u_char val; val = (*((volatile unsigned int *) cs->cs_reg_csr) >> 8) & 0xff; tc_mb(); DELAY(5); return (val); } void zs_write_csr(cs, val) struct zs_chanstate *cs; u_char val; { *((volatile unsigned int *) cs->cs_reg_csr) = ((volatile unsigned int) val) << 8; tc_mb(); DELAY(5); } u_char zs_read_data(cs) struct zs_chanstate *cs; { register u_char val; val = (*((volatile unsigned int *) cs->cs_reg_data) >> 8) & 0xff; tc_mb(); DELAY(5); return (val); } void zs_write_data(cs, val) struct zs_chanstate *cs; u_char val; { *((volatile unsigned int *) cs->cs_reg_data) = ((volatile unsigned int) val) << 8; tc_mb(); DELAY(5); } /**************************************************************** * Console support functions (Alpha TC specific!) ****************************************************************/ /* * Handle user request to enter kernel debugger. */ void zs_abort(cs) struct zs_chanstate *cs; { int rr0; /* Wait for end of break. */ /* XXX - Limit the wait? */ do { rr0 = zs_read_csr(cs); } while (rr0 & ZSRR0_BREAK); #if defined(KGDB) zskgdb(cs); #elif defined(DDB) Debugger(); #else printf("zs_abort: ignoring break on console\n"); #endif } /* * Polled input char. */ int zs_getc(cs) struct zs_chanstate *cs; { int s, c, rr0; s = splhigh(); /* Wait for a character to arrive. */ do { rr0 = zs_read_csr(cs); } while ((rr0 & ZSRR0_RX_READY) == 0); c = zs_read_data(cs); 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(cs, c) struct zs_chanstate *cs; int c; { register int s, rr0; s = splhigh(); /* Wait for transmitter to become ready. */ do { rr0 = zs_read_csr(cs); } while ((rr0 & ZSRR0_TX_READY) == 0); zs_write_data(cs, c); /* Wait for the character to be transmitted. */ do { rr0 = zs_read_csr(cs); } while ((rr0 & ZSRR0_TX_READY) == 0); splx(s); } /*****************************************************************/ /* * zs_ioasic_cninit -- * Initialize the serial channel for console use--either the * primary keyboard or as the serial console. */ void zs_ioasic_cninit(ioasic_addr, zs_offset, channel) tc_addr_t ioasic_addr; tc_offset_t zs_offset; int channel; { struct zs_chanstate *cs; tc_addr_t zs_addr; struct zshan *zc; /* * Initialize the console finder helpers. */ zs_ioasic_console_offset = zs_offset; zs_ioasic_console_channel = channel; zs_ioasic_console = 1; /* * Pointer to channel state. Later, the console channel * state is copied into the softc, and the console channel * pointer adjusted to point to the new copy. */ zs_ioasic_conschanstate = cs = &zs_ioasic_conschanstate_store; /* * Compute the physical address of the chip, "map" it via * K0SEG, and then get the address of the actual channel. */ zs_addr = ALPHA_PHYS_TO_K0SEG(ioasic_addr + zs_offset); zc = zs_ioasic_get_chan_addr(zs_addr, channel); /* Setup temporary chanstate. */ cs->cs_reg_csr = (volatile u_char *)&zc->zc_csr; cs->cs_reg_data = (volatile u_char *)&zc->zc_data; /* Initialize the pending registers. */ bcopy(zs_ioasic_init_reg, cs->cs_preg, 16); cs->cs_preg[5] |= (ZSWR5_DTR | ZSWR5_RTS); /* * DCD and CTS interrupts are only meaningful on * SCC 0/B. * * XXX This is sorta gross. */ if (zs_offset == 0x00100000 && channel == 1) (u_long)cs->cs_private = ZIP_FLAGS_DCDCTS; else cs->cs_private = NULL; /* Clear the master interrupt enable. */ zs_write_reg(cs, 9, 0); /* Reset the whole SCC chip. */ zs_write_reg(cs, 9, ZSWR9_HARD_RESET); /* Copy "pending" to "current" and H/W. */ zs_loadchannelregs(cs); } /* * zs_ioasic_cnattach -- * Initialize and attach a serial console. */ int zs_ioasic_cnattach(ioasic_addr, zs_offset, channel, rate, cflag) tc_addr_t ioasic_addr; tc_offset_t zs_offset; int channel, rate, cflag; { zs_ioasic_cninit(ioasic_addr, zs_offset, channel); zs_ioasic_conschanstate->cs_defspeed = rate; zs_ioasic_conschanstate->cs_defcflag = cflag; /* Point the console at the SCC. */ cn_tab = &zs_ioasic_cons; return (0); } /* * zs_ioasic_lk201_cnattach -- * Initialize and attach the primary keyboard. */ int zs_ioasic_lk201_cnattach(ioasic_addr, zs_offset, channel) tc_addr_t ioasic_addr; tc_offset_t zs_offset; int channel; { #if (NZSKBD > 0) zs_ioasic_cninit(ioasic_addr, zs_offset, channel); zs_ioasic_conschanstate->cs_defspeed = 4800; zs_ioasic_conschanstate->cs_defcflag = (TTYDEF_CFLAG & ~(CSIZE | PARENB)) | CS8; zs_ioasic_conschanstate->cs_brg_clk = PCLK / 16; return (zskbd_cnattach(zs_ioasic_conschanstate)); #else return (ENXIO); #endif } int zs_ioasic_isconsole(offset, channel) tc_offset_t offset; int channel; { if (zs_ioasic_console && offset == zs_ioasic_console_offset && channel == zs_ioasic_console_channel) return (1); return (0); } /* * Polled console input putchar. */ int zs_ioasic_cngetc(dev) dev_t dev; { return (zs_getc(zs_ioasic_conschanstate)); } /* * Polled console output putchar. */ void zs_ioasic_cnputc(dev, c) dev_t dev; int c; { zs_putc(zs_ioasic_conschanstate, c); } /* * Set polling/no polling on console. */ void zs_ioasic_cnpollc(dev, onoff) dev_t dev; int onoff; { /* XXX ??? */ }