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      1 /* $NetBSD: com_eumb.c,v 1.12 2021/03/25 05:35:50 rin Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2007 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Tohru Nishimura.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 __KERNEL_RCSID(0, "$NetBSD: com_eumb.c,v 1.12 2021/03/25 05:35:50 rin Exp $");
     34 
     35 #include <sys/param.h>
     36 #include <sys/device.h>
     37 #include <sys/tty.h>
     38 #include <sys/systm.h>
     39 
     40 #include <sys/bus.h>
     41 #include <machine/intr.h>
     42 
     43 #include <dev/ic/comreg.h>
     44 #include <dev/ic/comvar.h>
     45 
     46 #include <sandpoint/sandpoint/eumbvar.h>
     47 #include "locators.h"
     48 
     49 static int  com_eumb_match(device_t, cfdata_t , void *);
     50 static void com_eumb_attach(device_t, device_t, void *);
     51 
     52 CFATTACH_DECL_NEW(com_eumb, sizeof(struct com_softc),
     53     com_eumb_match, com_eumb_attach, NULL, NULL);
     54 
     55 static int found;
     56 static struct com_regs cnregs;
     57 
     58 /*
     59  * There are two different UART configurations: single 4-wire UART
     60  * and dual 2-wire.  The DCR register selects one of the two operating
     61  * modes.  A certain group of NAS boxes uses the 2nd UART as system
     62  * console while using the 1st to communicate with the power management
     63  * satellite processor. The "unit" locator helps to reverse the two.
     64  * Default is a single 4-wire UART as console.
     65  */
     66 int
     67 com_eumb_match(device_t parent, cfdata_t cf, void *aux)
     68 {
     69 	struct eumb_attach_args *eaa = aux;
     70 	int unit = eaa->eumb_unit;
     71 
     72 	if (unit == EUMBCF_UNIT_DEFAULT && found == 0)
     73 		return 1;
     74 	if (unit == 0 || unit == 1)
     75 		return 1;
     76 	return 0;
     77 }
     78 
     79 void
     80 com_eumb_attach(device_t parent, device_t self, void *aux)
     81 {
     82 	struct com_softc *sc = device_private(self);
     83 	struct eumb_attach_args *eaa = aux;
     84 	int comaddr, epicirq;
     85 	bus_space_handle_t ioh;
     86 	extern u_long ticks_per_sec;
     87 
     88 	sc->sc_dev = self;
     89 	found = 1;
     90 
     91 	comaddr = (eaa->eumb_unit == 1) ? 0x4600 : 0x4500;
     92 	if (com_is_console(eaa->eumb_bt, comaddr, &ioh)) {
     93 		cnregs.cr_ioh = ioh;
     94 		sc->sc_regs = cnregs;
     95 	} else {
     96 		bus_space_map(eaa->eumb_bt, comaddr, COM_NPORTS, 0, &ioh);
     97 		com_init_regs(&sc->sc_regs, eaa->eumb_bt, ioh, comaddr);
     98 	}
     99 	sc->sc_frequency = 4 * ticks_per_sec;
    100 	epicirq = (eaa->eumb_unit == 1) ? 25 : 24;
    101 
    102 	/*
    103 	 * XXX
    104 	 * At least KuroBox Classic and HG seem to have a hardware bug, by
    105 	 * which ETXRDY interrupt is sometimes, say, once per few hours,
    106 	 * lost; output stalls until next input arrives. In order to work
    107 	 * around this problem, push TX queue manually by low-rate.
    108 	 */
    109 #define	COM_EUMB_FLAG_BROKEN_ETXRDY	__BIT(0)
    110 	if (device_cfdata(self)->cf_flags & COM_EUMB_FLAG_BROKEN_ETXRDY) {
    111 		SET(sc->sc_hwflags, COM_HW_BROKEN_ETXRDY);
    112 		sc->sc_poll_ticks = 10 * hz;	/* once per 10 sec */
    113 	}
    114 
    115 	com_attach_subr(sc);
    116 
    117 	intr_establish_xname(epicirq + I8259_ICU, IST_LEVEL, IPL_SERIAL,
    118 	    comintr, sc, device_xname(self));
    119 	aprint_normal_dev(self, "interrupting at irq %d\n",
    120 	    epicirq + I8259_ICU);
    121 }
    122 
    123 int
    124 eumbcnattach(bus_space_tag_t tag,
    125     int conaddr, int conspeed, int confreq, int contype, int conmode)
    126 {
    127 	static int attached = 0;
    128 	bus_space_handle_t dummy_bsh; /* XXX see com.c:comcnattach() */
    129 
    130 	memset(&dummy_bsh, 0, sizeof(dummy_bsh));
    131 
    132 	if (attached)
    133 		return 0;
    134 	attached = 1;
    135 
    136 	cnregs.cr_iot = tag;
    137 	cnregs.cr_iobase = conaddr;
    138 	cnregs.cr_nports = COM_NPORTS;
    139 	com_init_regs(&cnregs, tag, dummy_bsh, conaddr);
    140 	return comcnattach1(&cnregs, conspeed, confreq, contype, conmode);
    141 }
    142