sys/arch/arm/omap/omap_com.c

   1 /*      $NetBSD: omap_com.c,v 1.2 2008/03/14 15:09:09 cube Exp $        */
   2
   3 /*
   4  * Based on arch/arm/xscale/pxa2x0_com.c
   5  *
   6  * Copyright 2003 Wasabi Systems, Inc.
   7  * All rights reserved.
   8  *
   9  * Written by Steve C. Woodford for Wasabi Systems, Inc.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. All advertising materials mentioning features or use of this software
  20  *    must display the following acknowledgement:
  21  *      This product includes software developed for the NetBSD Project by
  22  *      Wasabi Systems, Inc.
  23  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
  24  *    or promote products derived from this software without specific prior
  25  *    written permission.
  26  *
  27  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
  28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  29  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  30  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
  31  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  32  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  33  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  34  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  35  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  36  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  37  * POSSIBILITY OF SUCH DAMAGE.
  38  */
  39
  40 #include <sys/cdefs.h>
  41 __KERNEL_RCSID(0, "$NetBSD: omap_com.c,v 1.2 2008/03/14 15:09:09 cube Exp $");
  42
  43 #include "opt_com.h"
  44
  45 #include <sys/param.h>
  46 #include <sys/systm.h>
  47 #include <sys/device.h>
  48 #include <sys/termios.h>
  49
  50 #include <machine/intr.h>
  51 #include <machine/bus.h>
  52
  53 #include <dev/ic/comreg.h>
  54 #include <dev/ic/comvar.h>
  55
  56 #include <arm/omap/omap_reg.h>
  57 #include <arm/omap/omap_tipb.h>
  58 #include <arm/omap/omap_com.h>
  59
  60 #include "locators.h"
  61
  62 static int      omapuart_match(device_t, cfdata_t , void *);
  63 static void     omapuart_attach(device_t, device_t, void *);
  64
  65 CFATTACH_DECL_NEW(omapuart, sizeof(struct com_softc),
  66     omapuart_match, omapuart_attach, NULL, NULL);
  67
  68 static int
  69 omapuart_match(device_t parent, cfdata_t cf, void *aux)
  70 {
  71         struct tipb_attach_args *tipb = aux;
  72         bus_space_handle_t bh;
  73         int rv;
  74
  75         if (tipb->tipb_addr == -1 || tipb->tipb_intr == -1)
  76             panic("omapuart must have addr and intr specified in config.");
  77
  78         if (tipb->tipb_size == 0)
  79                 tipb->tipb_size = OMAP_COM_SIZE;
  80
  81         if (com_is_console(tipb->tipb_iot, tipb->tipb_addr, NULL))
  82                 return (1);
  83
  84         if (bus_space_map(tipb->tipb_iot, tipb->tipb_addr, tipb->tipb_size,
  85                           0, &bh))
  86                 return (0);
  87
  88         /*
  89          * The TRM says the mode should be disabled while dll and dlh are
  90          * being changed so we disable before probing, then enable.
  91          */
  92         bus_space_write_1(tipb->tipb_iot, bh,
  93                           OMAP_COM_MDR1, OMAP_COM_MDR1_MODE_DISABLE);
  94
  95         rv = comprobe1(tipb->tipb_iot, bh);
  96
  97         bus_space_write_1(tipb->tipb_iot, bh,
  98                           OMAP_COM_MDR1, OMAP_COM_MDR1_MODE_UART_16X);
  99
 100         bus_space_unmap(tipb->tipb_iot, bh, tipb->tipb_size);
 101
 102         return (rv);
 103 }
 104
 105 static void
 106 omapuart_attach(device_t parent, device_t self, void *aux)
 107 {
 108         struct com_softc *sc = device_private(self);
 109         struct tipb_attach_args *tipb = aux;
 110         bus_space_tag_t iot;
 111         bus_space_handle_t ioh;
 112         bus_addr_t iobase;
 113
 114         sc->sc_dev = self;
 115         iot = tipb->tipb_iot;
 116         iobase = tipb->tipb_addr;
 117         sc->sc_frequency = OMAP_COM_FREQ;
 118         sc->sc_type = COM_TYPE_NORMAL;
 119
 120         if (com_is_console(iot, iobase, &ioh) == 0 &&
 121             bus_space_map(iot, iobase, tipb->tipb_size, 0, &ioh)) {
 122                 panic(": can't map registers\n");
 123                 return;
 124         }
 125         COM_INIT_REGS(sc->sc_regs, iot, ioh, iobase);
 126
 127         com_attach_subr(sc);
 128         aprint_naive("\n");
 129
 130         omap_intr_establish(tipb->tipb_intr, IPL_SERIAL,
 131             device_xname(sc->sc_dev), comintr, sc);
 132 }