/* $NetBSD: zs_hb.c,v 1.25 2008/04/28 20:23:30 martin 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. * * 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 __KERNEL_RCSID(0, "$NetBSD: zs_hb.c,v 1.25 2008/04/28 20:23:30 martin Exp $"); #include #include #include #include #include #include #include #include #include #include #include #include #include "zsc.h" /* NZSC */ #define NZS NZSC /* Make life easier for the initialized arrays here. */ #if NZS < 2 #undef NZS #define NZS 2 #endif #define ZSCFLAG_EX 0x01 /* expansion board */ /* * The news3400 provides a 4.9152 MHz clock to the ZS chips. */ #define PCLK (9600 * 512) /* PCLK pin input clock rate */ #define PCLK_EX (9600 * 384) /* * Define interrupt levels. */ #define ZSHARD_PRI 64 #define ZS_DELAY() {(void)*(volatile char *)INTEN1; delay(2);} /* The layout of this is hardware-dependent (padding, order). */ struct zschan { volatile uint8_t zc_csr; /* ctrl,status, and indirect access */ volatile uint8_t zc_data; /* data */ }; struct zsdevice { /* Yes, they are backwards. */ struct zschan zs_chan_b; struct zschan zs_chan_a; }; extern int zs_def_cflag; static struct zsdevice *zsaddr[NZS]; /* Flags from cninit() */ static int zs_hwflags[NZS][2]; /* Default speed for all channels */ static int zs_defspeed = 9600; static uint8_t zs_init_reg[16] = { 0, /* 0: CMD (reset, etc.) */ 0, /* 1: No interrupts yet. */ 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, ((PCLK/32)/9600)-2, /*12: BAUDLO (default=9600) */ 0, /*13: BAUDHI (default=9600) */ ZSWR14_BAUD_ENA | ZSWR14_BAUD_FROM_PCLK, ZSWR15_BREAK_IE, }; static struct zschan * zs_get_chan_addr(int, int); static void zs_hb_delay(void); static int zshard_hb(void *); static int zs_getc(void *); static void zs_putc(void *, int); struct zschan * zs_get_chan_addr(int zs_unit, int channel) { struct zsdevice *addr; struct zschan *zc; if (zs_unit >= NZS) return NULL; addr = zsaddr[zs_unit]; if (addr == NULL) return NULL; if (channel == 0) { zc = &addr->zs_chan_a; } else { zc = &addr->zs_chan_b; } return zc; } static void zs_hb_delay(void) { ZS_DELAY(); } /**************************************************************** * Autoconfig ****************************************************************/ /* Definition of the driver for autoconfig. */ int zs_hb_match(device_t, cfdata_t, void *); void zs_hb_attach(device_t, device_t, void *); CFATTACH_DECL_NEW(zsc_hb, sizeof(struct zsc_softc), zs_hb_match, zs_hb_attach, NULL, NULL); /* * Is the zs chip present? */ int zs_hb_match(device_t parent, cfdata_t cf, void *aux) { struct hb_attach_args *ha = aux; if (strcmp(ha->ha_name, "zsc")) return 0; /* This returns -1 on a fault (bus error). */ if (hb_badaddr((char *)ha->ha_addr, 1)) 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. */ void zs_hb_attach(device_t parent, device_t self, void *aux) { struct zsc_softc *zsc = device_private(self); struct hb_attach_args *ha = aux; struct zsc_attach_args zsc_args; volatile struct zschan *zc; struct zs_chanstate *cs; int s, zs_unit, channel, intlevel; static int didintr; zsc->zsc_dev = self; zs_unit = device_unit(self); intlevel = ha->ha_level; zsaddr[zs_unit] = (void *)ha->ha_addr; if (intlevel == -1) { #if 0 aprint_error(": interrupt level not configured\n"); return; #else aprint_error(": interrupt level not configured; using"); intlevel = 1; #endif } aprint_error(" level %d\n", intlevel); zs_delay = zs_hb_delay; /* * Initialize software state for each channel. */ for (channel = 0; channel < 2; channel++) { zsc_args.channel = channel; zsc_args.hwflags = zs_hwflags[zs_unit][channel]; cs = &zsc->zsc_cs_store[channel]; zsc->zsc_cs[channel] = cs; zs_lock_init(cs); cs->cs_channel = channel; cs->cs_private = NULL; cs->cs_ops = &zsops_null; if ((device_cfdata(self)->cf_flags & ZSCFLAG_EX) == 0) cs->cs_brg_clk = PCLK / 16; else cs->cs_brg_clk = PCLK_EX / 16; zc = zs_get_chan_addr(zs_unit, channel); 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: Get these from the EEPROM instead? */ /* XXX: See the mvme167 code. Better. */ if (zsc_args.hwflags & ZS_HWFLAG_CONSOLE) cs->cs_defspeed = zs_get_speed(cs); else cs->cs_defspeed = zs_defspeed; 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 (!config_found(self, (void *)&zsc_args, zs_print)) { /* No sub-driver. Just reset it. */ uint8_t reset = (channel == 0) ? ZSWR9_A_RESET : ZSWR9_B_RESET; s = splhigh(); zs_write_reg(cs, 9, reset); splx(s); } } /* * 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. */ if (!didintr) { didintr = 1; zsc->zsc_si = softint_establish(SOFTINT_SERIAL, zssoft, zsc); hb_intr_establish(intlevel, INTST1_SCC, IPL_SERIAL, zshard_hb, NULL); } /* XXX; evcnt_attach() ? */ /* * 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 zshard_hb(void *arg) { int rv; (void) *(volatile u_char *)SCCVECT; rv = zshard(arg); /* XXX news3400 sometimes losts zs interrupt */ if (rv) zshard(arg); return rv; } /* * Polled input char. */ int zs_getc(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(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); zc->zc_data = c; ZS_DELAY(); splx(s); } /*****************************************************************/ static void zscnprobe(struct consdev *); static void zscninit(struct consdev *); static int zscngetc(dev_t); static void zscnputc(dev_t, int); struct consdev consdev_zs = { zscnprobe, zscninit, zscngetc, zscnputc, nullcnpollc, NULL, NULL, NULL, NODEV, CN_DEAD }; static void zscnprobe(struct consdev *cn) { } static void zscninit(struct consdev *cn) { extern const struct cdevsw zstty_cdevsw; cn->cn_dev = makedev(cdevsw_lookup_major(&zstty_cdevsw), 0); cn->cn_pri = CN_REMOTE; zs_hwflags[0][0] = ZS_HWFLAG_CONSOLE; } static int zscngetc(dev_t dev) { return zs_getc((void *)SCCPORT0A); } static void zscnputc(dev_t dev, int c) { zs_putc((void *)SCCPORT0A, c); }