sys/arch/arm/gemini/lpc_com.c

   1 /*      $NetBSD: lpc_com.c,v 1.2 2008/11/10 04:07:30 cliff Exp $        */
   2
   3 /* adapted from:
   4  *      NetBSD: gemini_com.c,v 1.1 2008/10/24 04:23:18 matt Exp
   5  */
   6
   7 /*
   8  * Based on arch/arm/xscale/pxa2x0_com.c
   9  *
  10  * Copyright 2003 Wasabi Systems, Inc.
  11  * All rights reserved.
  12  *
  13  * Written by Steve C. Woodford for Wasabi Systems, Inc.
  14  *
  15  * Redistribution and use in source and binary forms, with or without
  16  * modification, are permitted provided that the following conditions
  17  * are met:
  18  * 1. Redistributions of source code must retain the above copyright
  19  *    notice, this list of conditions and the following disclaimer.
  20  * 2. Redistributions in binary form must reproduce the above copyright
  21  *    notice, this list of conditions and the following disclaimer in the
  22  *    documentation and/or other materials provided with the distribution.
  23  * 3. All advertising materials mentioning features or use of this software
  24  *    must display the following acknowledgement:
  25  *      This product includes software developed for the NetBSD Project by
  26  *      Wasabi Systems, Inc.
  27  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
  28  *    or promote products derived from this software without specific prior
  29  *    written permission.
  30  *
  31  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
  32  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  33  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  34  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
  35  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  36  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  37  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  38  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  39  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  40  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGE.
  42  */
  43
  44 #include <sys/cdefs.h>
  45 __KERNEL_RCSID(0, "$NetBSD: lpc_com.c,v 1.2 2008/11/10 04:07:30 cliff Exp $");
  46
  47 #include "opt_com.h"
  48 #include "locators.h"
  49
  50 #include <sys/param.h>
  51 #include <sys/systm.h>
  52 #include <sys/device.h>
  53 #include <sys/termios.h>
  54 #include <sys/callout.h>
  55 #include <sys/kernel.h>
  56
  57 #include <machine/intr.h>
  58 #include <machine/bus.h>
  59
  60 #include <dev/ic/comreg.h>
  61 #include <dev/ic/comvar.h>
  62
  63 #include <arm/gemini/gemini_obiovar.h>
  64 #include <arm/gemini/gemini_lpchcvar.h>
  65 #include <arm/gemini/gemini_lpcvar.h>
  66 #include <arm/gemini/gemini_reg.h>
  67
  68 #include <arm/gemini/lpc_com.h>
  69
  70 typedef struct lpc_com_softc {
  71         struct com_softc        sc_com;
  72         bus_addr_t              sc_addr;
  73         bus_size_t              sc_size;
  74         int                     sc_intr;
  75         bus_space_tag_t         sc_iot;
  76         bus_space_handle_t      sc_ioh;
  77         struct callout          sc_callout;
  78 } lpc_com_softc_t;
  79
  80 static int      lpc_com_match(device_t, cfdata_t , void *);
  81 static void     lpc_com_attach(device_t, device_t, void *);
  82 static int      lpc_com_intr(void *);
  83 static void     lpc_com_time(void *);
  84
  85 CFATTACH_DECL_NEW(lpc_com, sizeof(struct lpc_com_softc),
  86     lpc_com_match, lpc_com_attach, NULL, NULL);
  87
  88 static int
  89 lpc_com_match(device_t parent, cfdata_t cf, void *aux)
  90 {
  91         struct gemini_lpc_attach_args *lpc = aux;
  92         lpctag_t lpctag;
  93         bus_space_tag_t iot;
  94         bus_space_handle_t ioh;
  95         bus_addr_t iobase;
  96         int rv;
  97
  98         if (lpc->lpc_addr == LPCCF_LDN_DEFAULT
  99         ||  lpc->lpc_addr == LPCCF_ADDR_DEFAULT)
 100                 panic("lpc_com must have ldn and addr"
 101                         " in config.");
 102
 103         if ((lpc->lpc_intr != LPCCF_INTR_DEFAULT) && (lpc->lpc_intr > 0xff))
 104                 panic("lpc_com: bad intr %d", lpc->lpc_intr);
 105
 106         if (lpc->lpc_size == LPCCF_SIZE_DEFAULT)
 107                 lpc->lpc_size = IT8712F_UART_SIZE;
 108
 109         iobase = lpc->lpc_base + lpc->lpc_addr;
 110         if (com_is_console(lpc->lpc_iot, iobase, NULL))
 111                 return 1;
 112
 113         lpctag = lpc->lpc_tag;
 114
 115         lpc_pnp_enter(lpctag);
 116
 117         /* Activate */
 118         lpc_pnp_write(lpctag, lpc->lpc_ldn, 0x30, 0x01);
 119
 120         /* Set address */
 121         lpc_pnp_write(lpctag, lpc->lpc_ldn, 0x60,
 122                 (lpc->lpc_addr % 0xff00) >> 8);
 123         lpc_pnp_write(lpctag, lpc->lpc_ldn, 0x61,
 124                 (lpc->lpc_addr % 0x00ff) >> 0);
 125
 126         /* Set Interrupt Level */
 127         lpc_pnp_write(lpctag, lpc->lpc_ldn, 0x70, lpc->lpc_intr);
 128
 129         /* Set Special Configuration Regs */
 130         lpc_pnp_write(lpctag, lpc->lpc_ldn, 0xf0, 0x00);
 131 #if 0
 132         lpc_pnp_write(lpctag, lpc->lpc_ldn, 0xf1, 0x50);
 133 #else
 134         lpc_pnp_write(lpctag, lpc->lpc_ldn, 0xf1, 0x58);        /* LO */
 135 #endif
 136         lpc_pnp_write(lpctag, lpc->lpc_ldn, 0xf2, 0x00);
 137         lpc_pnp_write(lpctag, lpc->lpc_ldn, 0xf3, 0x7f);
 138
 139         lpc_pnp_exit(lpctag);
 140
 141         iot = lpc->lpc_iot;
 142         if (bus_space_map(iot, iobase, lpc->lpc_size, 0, &ioh))
 143                 return 0;
 144
 145         rv = comprobe1(iot, ioh);
 146
 147         bus_space_unmap(iot, ioh, lpc->lpc_size);
 148
 149         return rv;
 150 }
 151
 152 static void
 153 lpc_com_attach(device_t parent, device_t self, void *aux)
 154 {
 155         struct lpc_com_softc *sc = device_private(self);
 156         struct gemini_lpc_attach_args *lpc = aux;
 157         bus_space_tag_t iot;
 158         bus_space_handle_t ioh;
 159         bus_addr_t iobase;
 160
 161         sc->sc_com.sc_dev = self;
 162         iot = lpc->lpc_iot;
 163         iobase = lpc->lpc_base + lpc->lpc_addr;
 164         sc->sc_com.sc_frequency = IT8712F_COM_FREQ;
 165         sc->sc_com.sc_type = COM_TYPE_NORMAL;
 166
 167         if (com_is_console(iot, iobase, &ioh) == 0 &&
 168             bus_space_map(iot, iobase, lpc->lpc_size, 0, &ioh)) {
 169                 panic(": can't map registers\n");
 170                 return;
 171         }
 172
 173         COM_INIT_REGS(sc->sc_com.sc_regs, iot, ioh, iobase);
 174
 175         com_attach_subr(&sc->sc_com);
 176         aprint_naive("\n");
 177
 178         if (lpc->lpc_intr == LPCCF_INTR_DEFAULT) {
 179                 /* callout based polliung */
 180                 callout_init(&sc->sc_callout, 0);
 181                 callout_setfunc(&sc->sc_callout, lpc_com_time, sc);
 182                 callout_schedule(&sc->sc_callout, hz/16);
 183                 aprint_normal("%s: callout polling mode\n", device_xname(self));
 184         } else {
 185                 /* interrupting */
 186 #if 0
 187                 lpc_intr_establish(lpc->lpc_tag, lpc->lpc_intr,
 188                         IPL_SERIAL, IST_LEVEL_HIGH, comintr, &sc->sc_com);
 189 #else
 190                 lpc_intr_establish(lpc->lpc_tag, lpc->lpc_intr,
 191                         IPL_SERIAL, IST_LEVEL_LOW, lpc_com_intr, &sc->sc_com);
 192 #endif
 193         }
 194 }
 195
 196 int
 197 lpc_com_intr(void *arg)
 198 {
 199         printf(".");
 200         return comintr(arg);
 201 }
 202
 203 void
 204 lpc_com_time(void *arg)
 205 {
 206         lpc_com_softc_t *sc = arg;
 207         int s;
 208
 209         s = splserial();
 210         (void)comintr(&sc->sc_com);
 211         callout_schedule(&sc->sc_callout, hz/16);
 212         splx(s);
 213 }