1 /* $NetBSD: com_mainbus.c,v 1.9 2004/08/29 16:14:15 tsutsui Exp $ */ 2 3 /* 4 * Copyright (c) 2000 Soren S. Jorvang. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions, and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __KERNEL_RCSID(0, "$NetBSD: com_mainbus.c,v 1.9 2004/08/29 16:14:15 tsutsui Exp $"); 30 31 #include <sys/param.h> 32 #include <sys/systm.h> 33 #include <sys/device.h> 34 #include <sys/termios.h> 35 36 #include <machine/autoconf.h> 37 #include <machine/intr.h> 38 #include <machine/bus.h> 39 #include <machine/nvram.h> 40 #include <machine/bootinfo.h> 41 42 #include <dev/ic/comreg.h> 43 #include <dev/ic/comvar.h> 44 45 #include <cobalt/dev/com_mainbusvar.h> 46 47 extern int console_present; 48 49 struct com_mainbus_softc { 50 struct com_softc sc_com; 51 void *sc_ih; 52 }; 53 54 #define COM_MAINBUS_FREQ (COM_FREQ * 10) 55 #define CONMODE ((TTYDEF_CFLAG & ~(CSIZE | CSTOPB | PARENB)) | CS8) /* 8N1 */ 56 57 static int com_mainbus_probe(struct device *, struct cfdata *, void *); 58 static void com_mainbus_attach(struct device *, struct device *, void *); 59 60 CFATTACH_DECL(com_mainbus, sizeof(struct com_mainbus_softc), 61 com_mainbus_probe, com_mainbus_attach, NULL, NULL); 62 63 int 64 com_mainbus_probe(struct device *parent, struct cfdata *match, void *aux) 65 { 66 67 return console_present != 0; 68 } 69 70 void 71 com_mainbus_attach(struct device *parent, struct device *self, void *aux) 72 { 73 struct com_mainbus_softc *msc = (void *)self; 74 struct com_softc *sc = &msc->sc_com; 75 struct mainbus_attach_args *maa = aux; 76 77 sc->sc_iot = maa->ma_iot; 78 sc->sc_iobase = maa->ma_addr; 79 80 #if 0 /* XXX */ 81 if (!com_is_console(sc->sc_iot, sc->sc_iobase, &sc->sc_ioh) && 82 bus_space_map(sc->sc_iot, sc->sc_iobase, COM_NPORTS, 0, 83 &sc->sc_ioh)) { 84 printf(": can't map i/o space\n"); 85 return; 86 } 87 #else 88 sc->sc_ioh = maa->ma_ioh; 89 #endif 90 91 sc->sc_frequency = COM_MAINBUS_FREQ; 92 93 com_attach_subr(sc); 94 95 cpu_intr_establish(maa->ma_level, IPL_SERIAL, comintr, sc); 96 97 return; 98 } 99 100 void 101 com_mainbus_cnprobe(struct consdev *cn) 102 { 103 struct btinfo_flags *bi_flags; 104 105 /* 106 * Linux code has a comment that serial console must be probed 107 * early, otherwise the value which allows to detect serial port 108 * could be overwritten. Okay, probe here and record the result 109 * for the future use. 110 * 111 * Note that if the kernel was booted with a boot loader, 112 * the latter *has* to provide a flag indicating whether console 113 * is present or not because the value might be overwritten by 114 * the loaded kernel. 115 */ 116 if ((bi_flags = lookup_bootinfo(BTINFO_FLAGS)) == NULL) { 117 /* No boot information, probe console now */ 118 console_present = *(volatile u_int32_t *) 119 MIPS_PHYS_TO_KSEG1(0x0020001c); 120 } else { 121 /* Get the value determined by the boot loader. */ 122 console_present = bi_flags->bi_flags & BI_SERIAL_CONSOLE; 123 } 124 125 cn->cn_pri = (console_present != 0) ? CN_NORMAL : CN_DEAD; 126 } 127 128 void 129 com_mainbus_cninit(struct consdev *cn) 130 { 131 132 comcnattach(0, 0x1c800000, 115200, COM_MAINBUS_FREQ, COM_TYPE_NORMAL, 133 CONMODE); 134 } 135