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com_aubus.c revision 1.2.14.3
      1 /* $NetBSD: com_aubus.c,v 1.2.14.3 2007/09/03 14:27:53 yamt Exp $ */
      2 
      3 /*
      4  * Copyright 2001 Wasabi Systems, Inc.
      5  * All rights reserved.
      6  *
      7  * Written by Eduardo Horvath and Simon Burge for Wasabi Systems, Inc.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  * 3. All advertising materials mentioning features or use of this software
     18  *    must display the following acknowledgement:
     19  *      This product includes software developed for the NetBSD Project by
     20  *      Wasabi Systems, Inc.
     21  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
     22  *    or promote products derived from this software without specific prior
     23  *    written permission.
     24  *
     25  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
     26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     27  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     28  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
     29  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     30  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     31  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     32  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     33  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     34  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     35  * POSSIBILITY OF SUCH DAMAGE.
     36  */
     37 
     38 #include <sys/cdefs.h>
     39 __KERNEL_RCSID(0, "$NetBSD: com_aubus.c,v 1.2.14.3 2007/09/03 14:27:53 yamt Exp $");
     40 
     41 #include <sys/param.h>
     42 #include <sys/device.h>
     43 #include <sys/lwp.h>
     44 #include <sys/systm.h>
     45 #include <sys/tty.h>
     46 
     47 #include <machine/bus.h>
     48 #include <dev/ic/comvar.h>
     49 
     50 #include <mips/alchemy/include/aureg.h>
     51 #include <mips/alchemy/include/auvar.h>
     52 #include <mips/alchemy/include/aubusvar.h>
     53 #include <mips/alchemy/dev/com_aubus_reg.h>
     54 
     55 struct com_aubus_softc {
     56 	struct com_softc sc_com;
     57 	int sc_irq;
     58 	void *sc_ih;
     59 };
     60 
     61 static int	com_aubus_probe(struct device *, struct cfdata *, void *);
     62 static void	com_aubus_attach(struct device *, struct device *, void *);
     63 static int	com_aubus_enable(struct com_softc *);
     64 static void	com_aubus_disable(struct com_softc *);
     65 static void	com_aubus_initmap(struct com_regs *);
     66 
     67 CFATTACH_DECL(com_aubus, sizeof(struct com_aubus_softc),
     68     com_aubus_probe, com_aubus_attach, NULL, NULL);
     69 
     70 #define CONMODE	((TTYDEF_CFLAG & ~(CSIZE | CSTOPB | PARENB)) | CS8) /* 8N1 */
     71 
     72 #ifndef	COM_REGMAP
     73 #error	COM_REGMAP not defined!
     74 #endif
     75 
     76 int
     77 com_aubus_probe(struct device *parent, struct cfdata *cf, void *aux)
     78 {
     79 	struct aubus_attach_args *aa = aux;
     80 
     81 	/* match only aucom devices */
     82 	if (strcmp(aa->aa_name, cf->cf_name) == 0)
     83 		return (1);
     84 
     85 	return (0);
     86 }
     87 
     88 void
     89 com_aubus_attach(struct device *parent, struct device *self, void *aux)
     90 {
     91 	struct com_aubus_softc *asc = (void *)self;
     92 	struct com_softc *sc = &asc->sc_com;
     93 	struct aubus_attach_args *aa = aux;
     94 	int addr = aa->aa_addr;
     95 
     96 	sc->sc_regs.cr_iot = aa->aa_st;
     97 	sc->sc_regs.cr_iobase = addr;
     98 	asc->sc_irq = aa->aa_irq[0];
     99 
    100 	if (com_is_console(aa->aa_st, addr, &sc->sc_regs.cr_ioh) == 0 &&
    101 	    bus_space_map(aa->aa_st, addr, AUCOM_NPORTS, 0,
    102 		&sc->sc_regs.cr_ioh) != 0) {
    103 		printf(": can't map i/o space\n");
    104 		return;
    105 	}
    106 	com_aubus_initmap(&sc->sc_regs);
    107 
    108 	/*
    109 	 * The input to the clock divider is the internal pbus clock (1/4 the
    110 	 * processor frequency).  The actual baud rate of the interface will
    111 	 * be pbus_freq / CLKDIV.
    112 	 */
    113 	sc->sc_frequency = curcpu()->ci_cpu_freq / 4;
    114 
    115 	sc->sc_hwflags = COM_HW_NO_TXPRELOAD;
    116 	sc->sc_type = COM_TYPE_AU1x00;
    117 
    118 	sc->enable = com_aubus_enable;
    119 	sc->disable = com_aubus_disable;
    120 
    121 	/* Enable UART so we can access it. */
    122 	com_aubus_enable(sc);
    123 	sc->enabled = 1;
    124 
    125 	/* Attach MI com driver. */
    126 	com_attach_subr(sc);
    127 
    128 	/* Disable UART if it's not the console. (XXX kgdb?) */
    129 	if (!ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) {
    130 		com_aubus_disable(sc);
    131 		sc->enabled = 0;
    132 	}
    133 }
    134 
    135 int
    136 com_aubus_enable(struct com_softc *sc)
    137 {
    138 	struct com_aubus_softc *asc = (void *)sc; /* XXX mi prototype */
    139 
    140 	/* Ignore requests to enable an already enabled console. */
    141 	if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE) && (asc->sc_ih != NULL))
    142 		return (0);
    143 
    144 	/* Enable the UART module. */
    145 	bus_space_write_1(sc->sc_regs.cr_iot, sc->sc_regs.cr_ioh, AUCOM_MODCTL,
    146 	    UMC_ME | UMC_CE);
    147 
    148 	/* Establish the interrupt. */
    149 	asc->sc_ih = au_intr_establish(asc->sc_irq, 0, IPL_SERIAL, IST_LEVEL,
    150 	    comintr, sc);
    151 	if (asc->sc_ih == NULL) {
    152 		printf("%s: unable to establish interrupt\n",
    153 		    sc->sc_dev.dv_xname);
    154 		return (1);
    155 	}
    156 
    157 	return (0);
    158 }
    159 
    160 void
    161 com_aubus_disable(struct com_softc *sc)
    162 {
    163 	struct com_aubus_softc *asc = (void *)sc; /* XXX mi prototype */
    164 
    165 	/* Ignore requests to disable the console. */
    166 	if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE))
    167 		return;
    168 
    169 	/* Disestablish the interrupt. */
    170 	au_intr_disestablish(asc->sc_ih);
    171 
    172 	/* Disable the UART module. */
    173 	bus_space_write_1(sc->sc_regs.cr_iot, sc->sc_regs.cr_ioh,
    174 	    AUCOM_MODCTL, 0);
    175 }
    176 
    177 void
    178 com_aubus_initmap(struct com_regs *regsp)
    179 {
    180 	regsp->cr_nports = AUCOM_NPORTS;
    181 	regsp->cr_map[COM_REG_RXDATA] = AUCOM_RXDATA;
    182 	regsp->cr_map[COM_REG_TXDATA] = AUCOM_TXDATA;
    183 	regsp->cr_map[COM_REG_DLBL] = AUCOM_DLB;
    184 	regsp->cr_map[COM_REG_DLBH] = AUCOM_DLB;
    185 	regsp->cr_map[COM_REG_IER] = AUCOM_IER;
    186 	regsp->cr_map[COM_REG_IIR] = AUCOM_IIR;
    187 	regsp->cr_map[COM_REG_FIFO] = AUCOM_FIFO;
    188 	regsp->cr_map[COM_REG_EFR] = 0;
    189 	regsp->cr_map[COM_REG_LCR] = AUCOM_LCTL;
    190 	regsp->cr_map[COM_REG_MCR] = AUCOM_MCR;
    191 	regsp->cr_map[COM_REG_LSR] = AUCOM_LSR;
    192 	regsp->cr_map[COM_REG_MSR] = AUCOM_MSR;
    193 }
    194 
    195 int
    196 com_aubus_cnattach(bus_addr_t addr, int baud)
    197 {
    198 	struct com_regs		regs;
    199 	uint32_t		sysfreq;
    200 
    201 	regs.cr_iot = aubus_st;
    202 	regs.cr_iobase = addr;
    203 	regs.cr_nports = AUCOM_NPORTS;
    204 	com_aubus_initmap(&regs);
    205 
    206 	sysfreq = curcpu()->ci_cpu_freq / 4;
    207 
    208 	return comcnattach1(&regs, baud, sysfreq, COM_TYPE_AU1x00, CONMODE);
    209 }
    210