/* $NetBSD: ms_zs.c,v 1.20 2013/11/07 02:38:07 christos Exp $ */ /* * Copyright (c) 1992, 1993 * The Regents of the University of California. All rights reserved. * * This software was developed by the Computer Systems Engineering group * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and * contributed to Berkeley. * * All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Lawrence Berkeley Laboratory. * * 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. Neither the name of the University 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 REGENTS 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 REGENTS 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. * * @(#)ms.c 8.1 (Berkeley) 6/11/93 */ /* * Mouse driver (/dev/mouse) */ /* * Zilog Z8530 Dual UART driver (mouse interface) * * This is the "slave" driver that will be attached to * the "zsc" driver for a Sun mouse. */ #include __KERNEL_RCSID(0, "$NetBSD: ms_zs.c,v 1.20 2013/11/07 02:38:07 christos Exp $"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static void ms_zs_rxint(struct zs_chanstate *); static void ms_zs_stint(struct zs_chanstate *, int); static void ms_zs_txint(struct zs_chanstate *); static void ms_zs_softint(struct zs_chanstate *); struct zsops zsops_ms = { ms_zs_rxint, /* receive char available */ ms_zs_stint, /* external/status */ ms_zs_txint, /* xmit buffer empty */ ms_zs_softint, /* process software interrupt */ }; /* Fall-back baud rate */ #ifdef SUN_MS_BPS int ms_zs_bps = SUN_MS_BPS; #else int ms_zs_bps = MS_DEFAULT_BPS; #endif static int ms_zs_match(device_t, cfdata_t, void *); static void ms_zs_attach(device_t, device_t, void *); CFATTACH_DECL_NEW(ms_zs, sizeof(struct ms_softc), ms_zs_match, ms_zs_attach, NULL, NULL); /* * ms_match: how is this zs channel configured? */ int ms_zs_match(device_t parent, cfdata_t cf, void *aux) { struct zsc_attach_args *args = aux; if (ms_zs_bps == 0) return 0; /* Exact match required for keyboard. */ if (cf->cf_loc[ZSCCF_CHANNEL] == args->channel) return 2; return 0; } void ms_zs_attach(device_t parent, device_t self, void *aux) { struct zsc_softc *zsc = device_private(parent); struct ms_softc *ms = device_private(self); struct zsc_attach_args *args = aux; struct zs_chanstate *cs; int channel; int reset, s; int bps; ms->ms_dev = self; channel = args->channel; cs = zsc->zsc_cs[channel]; cs->cs_private = ms; cs->cs_ops = &zsops_ms; ms->ms_cs = cs; /* Allow kernel option SUN_MS_BPS to hard-code baud rate */ #ifndef SUN_MS_BPS if ((bps = cs->cs_defspeed) == 0) #endif bps = ms_zs_bps; aprint_normal(": baud rate %d\n", bps); /* Initialize the speed, etc. */ s = splzs(); /* May need reset... */ reset = (channel == 0) ? ZSWR9_A_RESET : ZSWR9_B_RESET; zs_write_reg(cs, 9, reset); /* These are OK as set by zscc: WR3, WR4, WR5 */ /* We don't care about status or tx interrupts. */ cs->cs_preg[1] = ZSWR1_RIE; (void)zs_set_speed(cs, bps); zs_loadchannelregs(cs); splx(s); /* Initialize translator. */ ms->ms_byteno = -1; } /**************************************************************** * Interface to the lower layer (zscc) ****************************************************************/ static void ms_zs_rxint(struct zs_chanstate *cs) { struct ms_softc *ms; int put, put_next; uint8_t c, rr1; ms = cs->cs_private; put = ms->ms_rbput; /* * First read the status, because reading the received char * destroys the status of this char. */ rr1 = zs_read_reg(cs, 1); c = zs_read_data(cs); if (rr1 & (ZSRR1_FE | ZSRR1_DO | ZSRR1_PE)) { /* Clear the receive error. */ zs_write_csr(cs, ZSWR0_RESET_ERRORS); } ms->ms_rbuf[put] = (c << 8) | rr1; put_next = (put + 1) & MS_RX_RING_MASK; /* Would overrun if increment makes (put==get). */ if (put_next == ms->ms_rbget) { ms->ms_intr_flags |= INTR_RX_OVERRUN; } else { /* OK, really increment. */ put = put_next; } /* Done reading. */ ms->ms_rbput = put; /* Ask for softint() call. */ cs->cs_softreq = 1; } static void ms_zs_txint(struct zs_chanstate *cs) { struct ms_softc *ms; ms = cs->cs_private; zs_write_csr(cs, ZSWR0_RESET_TXINT); ms->ms_intr_flags |= INTR_TX_EMPTY; /* Ask for softint() call. */ cs->cs_softreq = 1; } static void ms_zs_stint(struct zs_chanstate *cs, int force) { struct ms_softc *ms; uint8_t rr0; ms = cs->cs_private; rr0 = zs_read_csr(cs); zs_write_csr(cs, ZSWR0_RESET_STATUS); /* * We have to accumulate status line changes here. * Otherwise, if we get multiple status interrupts * before the softint runs, we could fail to notice * some status line changes in the softint routine. * Fix from Bill Studenmund, October 1996. */ cs->cs_rr0_delta |= (cs->cs_rr0 ^ rr0); cs->cs_rr0 = rr0; ms->ms_intr_flags |= INTR_ST_CHECK; /* Ask for softint() call. */ cs->cs_softreq = 1; } static void ms_zs_softint(struct zs_chanstate *cs) { struct ms_softc *ms; int get, c, s; int intr_flags; uint16_t ring_data; ms = cs->cs_private; /* Atomically get and clear flags. */ s = splzs(); intr_flags = ms->ms_intr_flags; ms->ms_intr_flags = 0; /* Now lower to spltty for the rest. */ (void)spltty(); /* * Copy data from the receive ring to the event layer. */ get = ms->ms_rbget; while (get != ms->ms_rbput) { ring_data = ms->ms_rbuf[get]; get = (get + 1) & MS_RX_RING_MASK; /* low byte of ring_data is rr1 */ c = (ring_data >> 8) & 0xff; if (ring_data & ZSRR1_DO) intr_flags |= INTR_RX_OVERRUN; if (ring_data & (ZSRR1_FE | ZSRR1_PE)) { log(LOG_ERR, "%s: input error (0x%x)\n", device_xname(ms->ms_dev), ring_data); c = -1; /* signal input error */ } /* Pass this up to the "middle" layer. */ ms_input(ms, c); } if (intr_flags & INTR_RX_OVERRUN) { log(LOG_ERR, "%s: input overrun\n", device_xname(ms->ms_dev)); } ms->ms_rbget = get; if (intr_flags & INTR_TX_EMPTY) { /* * Transmit done. (Not expected.) */ log(LOG_ERR, "%s: transmit interrupt?\n", device_xname(ms->ms_dev)); } if (intr_flags & INTR_ST_CHECK) { /* * Status line change. (Not expected.) */ log(LOG_ERR, "%s: status interrupt?\n", device_xname(ms->ms_dev)); cs->cs_rr0_delta = 0; } splx(s); }