/* $NetBSD: kbd_zs.c,v 1.23 2008/04/20 15:44:01 tsutsui 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. * * @(#)kbd.c 8.2 (Berkeley) 10/30/93 */ /* * /dev/kbd lower layer for sun keyboard off a zs channel. * This driver uses kbdsun middle layer to hook up to /dev/kbd. */ /* * Zilog Z8530 Dual UART driver (keyboard interface) * * This is the 8530 portion of the driver that will be attached to * the "zsc" driver for a Sun keyboard. */ #include __KERNEL_RCSID(0, "$NetBSD: kbd_zs.c,v 1.23 2008/04/20 15:44:01 tsutsui Exp $"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #if NWSKBD > 0 void kbd_wskbd_attach(struct kbd_softc *k, int isconsole); #endif /**************************************************************** * Interface to the lower layer (zscc) ****************************************************************/ static void kbd_zs_rxint(struct zs_chanstate *); static void kbd_zs_stint(struct zs_chanstate *, int); static void kbd_zs_txint(struct zs_chanstate *); static void kbd_zs_softint(struct zs_chanstate *); struct zsops zsops_kbd = { kbd_zs_rxint, /* receive char available */ kbd_zs_stint, /* external/status */ kbd_zs_txint, /* xmit buffer empty */ kbd_zs_softint, /* process software interrupt */ }; static int kbd_zs_match(device_t, cfdata_t, void *); static void kbd_zs_attach(device_t, device_t, void *); static void kbd_zs_write_data(struct kbd_sun_softc *, int); CFATTACH_DECL_NEW(kbd_zs, sizeof(struct kbd_sun_softc), kbd_zs_match, kbd_zs_attach, NULL, NULL); /* Fall-back baud rate */ int kbd_zs_bps = KBD_DEFAULT_BPS; /* * kbd_zs_match: how is this zs channel configured? */ int kbd_zs_match(device_t parent, cfdata_t cf, void *aux) { struct zsc_attach_args *args = aux; /* Exact match required for keyboard. */ if (cf->cf_loc[ZSCCF_CHANNEL] == args->channel) return 2; return 0; } void kbd_zs_attach(device_t parent, device_t self, void *aux) { struct kbd_sun_softc *k = device_private(self); struct zsc_softc *zsc = device_private(parent); struct zsc_attach_args *args = aux; struct zs_chanstate *cs; int channel; int reset, s; int bps; k->k_kbd.k_dev = self; /* provide upper layer with a link to the middle layer */ k->k_kbd.k_ops = &kbd_ops_sun; /* provide middle layer with a link to the lower layer (i.e. us) */ channel = args->channel; cs = zsc->zsc_cs[channel]; cs->cs_private = k; cs->cs_ops = &zsops_kbd; k->k_cs = cs; k->k_write_data = kbd_zs_write_data; if ((bps = cs->cs_defspeed) == 0) bps = kbd_zs_bps; aprint_normal(": baud rate %d", bps); if ((args->hwflags & ZS_HWFLAG_CONSOLE_INPUT) != 0) { /* * Hookup ourselves as the console input channel */ struct cons_channel *cc = kbd_cc_alloc(&k->k_kbd); if (cc == NULL) return; cons_attach_input(cc, args->consdev); k->k_kbd.k_isconsole = 1; aprint_normal(" (console input)"); } aprint_normal("\n"); /* Initialize the speed, etc. */ s = splzs(); if (k->k_kbd.k_isconsole == 0) { /* Not the console; 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 interrupts. */ cs->cs_preg[1] = ZSWR1_RIE | ZSWR1_TIE; (void) zs_set_speed(cs, bps); zs_loadchannelregs(cs); splx(s); /* Do this before any calls to kbd_rint(). */ kbd_xlate_init(&k->k_kbd.k_state); /* Magic sequence. */ k->k_magic1 = KBD_L1; k->k_magic2 = KBD_A; #if NWSKBD > 0 kbd_wskbd_attach(&k->k_kbd, k->k_kbd.k_isconsole); #endif } /* * used by kbd_sun_start_tx(); */ void kbd_zs_write_data(struct kbd_sun_softc *k, int c) { int s; /* Need splzs to avoid interruption of the delay. */ s = splzs(); zs_write_data(k->k_cs, c); splx(s); } static void kbd_zs_rxint(struct zs_chanstate *cs) { struct kbd_sun_softc *k; int put, put_next; uint8_t c, rr1; k = cs->cs_private; put = k->k_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); } /* * Check NOW for a console abort sequence, so that we can * abort even when interrupts are locking up the machine. */ if (k->k_magic1_down) { /* The last keycode was "MAGIC1" down. */ k->k_magic1_down = 0; if (c == k->k_magic2) { /* Magic "L1-A" sequence; enter debugger. */ if (k->k_kbd.k_isconsole) { zs_abort(cs); /* Debugger done. Fake L1-up to finish it. */ c = k->k_magic1 | KBD_UP; } else { printf("%s: magic sequence, but not console\n", device_xname(k->k_kbd.k_dev)); } } } if (c == k->k_magic1) { k->k_magic1_down = 1; } k->k_rbuf[put] = (c << 8) | rr1; put_next = (put + 1) & KBD_RX_RING_MASK; /* Would overrun if increment makes (put==get). */ if (put_next == k->k_rbget) { k->k_intr_flags |= INTR_RX_OVERRUN; } else { /* OK, really increment. */ put = put_next; } /* Done reading. */ k->k_rbput = put; /* Ask for softint() call. */ cs->cs_softreq = 1; } static void kbd_zs_txint(struct zs_chanstate *cs) { struct kbd_sun_softc *k; k = cs->cs_private; zs_write_csr(cs, ZSWR0_RESET_TXINT); k->k_intr_flags |= INTR_TX_EMPTY; /* Ask for softint() call. */ cs->cs_softreq = 1; } static void kbd_zs_stint(struct zs_chanstate *cs, int force) { struct kbd_sun_softc *k; uint8_t rr0; k = cs->cs_private; rr0 = zs_read_csr(cs); zs_write_csr(cs, ZSWR0_RESET_STATUS); #if 0 if (rr0 & ZSRR0_BREAK) { /* Keyboard unplugged? */ zs_abort(cs); return; } #endif /* * 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; k->k_intr_flags |= INTR_ST_CHECK; /* Ask for softint() call. */ cs->cs_softreq = 1; } /* * Get input from the receive ring and pass it on. * Note: this is called at splsoftclock() */ static void kbd_zs_softint(struct zs_chanstate *cs) { struct kbd_sun_softc *k; int get, c, s; int intr_flags; uint16_t ring_data; k = cs->cs_private; /* Atomically get and clear flags. */ s = splzs(); intr_flags = k->k_intr_flags; k->k_intr_flags = 0; /* Now lower to spltty for the rest. */ (void)spltty(); /* * Copy data from the receive ring to the event layer. */ get = k->k_rbget; while (get != k->k_rbput) { ring_data = k->k_rbuf[get]; get = (get + 1) & KBD_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)) { /* * After garbage, flush pending input, and * send a reset to resync key translation. */ log(LOG_ERR, "%s: input error (0x%x)\n", device_xname(k->k_kbd.k_dev), ring_data); get = k->k_rbput; /* flush */ goto send_reset; } /* Pass this up to the "middle" layer. */ kbd_sun_input(k, c); } if (intr_flags & INTR_RX_OVERRUN) { log(LOG_ERR, "%s: input overrun\n", device_xname(k->k_kbd.k_dev)); send_reset: /* Send a reset to resync translation. */ kbd_sun_output(k, KBD_CMD_RESET); kbd_sun_start_tx(k); } k->k_rbget = get; if (intr_flags & INTR_TX_EMPTY) { /* * Transmit done. Try to send more, or * clear busy and wakeup drain waiters. */ k->k_txflags &= ~K_TXBUSY; kbd_sun_start_tx(k); } if (intr_flags & INTR_ST_CHECK) { /* * Status line change. (Not expected.) */ log(LOG_ERR, "%s: status interrupt?\n", device_xname(k->k_kbd.k_dev)); cs->cs_rr0_delta = 0; } splx(s); }