sys/arch/mips/atheros/ar5312_console.c

   1 /* $NetBSD: ar5312.c,v 1.2 2006/09/04 05:17:26 gdamore Exp $ */
   2
   3 /*
   4  * Copyright (c) 2006 Urbana-Champaign Independent Media Center.
   5  * Copyright (c) 2006 Garrett D'Amore.
   6  * All rights reserved.
   7  *
   8  * Portions of this code were written by Garrett D'Amore for the
   9  * Champaign-Urbana Community Wireless Network Project.
  10  *
  11  * Redistribution and use in source and binary forms, with or
  12  * without modification, are permitted provided that the following
  13  * conditions 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
  17  *    copyright notice, this list of conditions and the following
  18  *    disclaimer in the documentation and/or other materials provided
  19  *    with the distribution.
  20  * 3. All advertising materials mentioning features or use of this
  21  *    software must display the following acknowledgements:
  22  *      This product includes software developed by the Urbana-Champaign
  23  *      Independent Media Center.
  24  *      This product includes software developed by Garrett D'Amore.
  25  * 4. Urbana-Champaign Independent Media Center's name and Garrett
  26  *    D'Amore's name may not be used to endorse or promote products
  27  *    derived from this software without specific prior written permission.
  28  *
  29  * THIS SOFTWARE IS PROVIDED BY THE URBANA-CHAMPAIGN INDEPENDENT
  30  * MEDIA CENTER AND GARRETT D'AMORE ``AS IS'' AND ANY EXPRESS OR
  31  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  32  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  33  * ARE DISCLAIMED.  IN NO EVENT SHALL THE URBANA-CHAMPAIGN INDEPENDENT
  34  * MEDIA CENTER OR GARRETT D'AMORE BE LIABLE FOR ANY DIRECT, INDIRECT,
  35  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  36  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  37  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  38  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  40  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  41  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  42  */
  43
  44 /*
  45  * This file includes a implementation specific console for AR5312.
  46  */
  47 #include <sys/cdefs.h>
  48 __KERNEL_RCSID(0, "$NetBSD$");
  49
  50 #include "opt_ddb.h"
  51 #include "opt_kgdb.h"
  52
  53 #include "opt_memsize.h"
  54 #include <sys/param.h>
  55 #include <sys/systm.h>
  56 #include <sys/kernel.h>
  57 #include <sys/buf.h>
  58
  59 #include <dev/cons.h>
  60
  61 #include <mips/cache.h>
  62 #include <mips/locore.h>
  63 #include <mips/cpuregs.h>
  64
  65 #include <mips/atheros/include/ar5312reg.h>
  66 #include <mips/atheros/include/ar531xvar.h>
  67 #include <mips/atheros/include/arbusvar.h>
  68 #include "com.h"
  69
  70 void
  71 ar531x_consinit(void)
  72 {
  73         /*
  74          * Everything related to console initialization is done
  75          * in mach_init().
  76          */
  77 #if NCOM > 0
  78         /* Setup polled serial for early console I/O */
  79         /* XXX: pass in CONSPEED? */
  80         com_arbus_cnattach(AR5312_UART0_BASE, ar531x_bus_freq());
  81 #else
  82         panic("Not configured to use serial console!\n");
  83         /* not going to see that message now, are we? */
  84 #endif
  85 }
  86
  87 /*
  88  * Early console support.
  89  */
  90 #define STRIDE(x)       ((x*4) + MIPS_PHYS_TO_KSEG1(AR5312_UART0_BASE + 3))
  91 #define THR             STRIDE(0)
  92 #define RHR             STRIDE(0)
  93 #define DLBL            STRIDE(0)
  94 #define DLBH            STRIDE(1)
  95 #define IER             STRIDE(1)
  96 #define FCR             STRIDE(2)
  97 #define LCR             STRIDE(3)
  98 #define MCR             STRIDE(4)
  99 #define LSR             STRIDE(5)
 100 #define MSR             STRIDE(6)
 101 #define SCRATCH         STRIDE(7)
 102 #define INB(x)          (*(volatile char *)(x))
 103 #define OUTB(x, v)      (*(volatile char *)(x) = (v))
 104
 105 /* line status register */
 106 #define LSR_RCV_FIFO    0x80
 107 #define LSR_TSRE        0x40    /* Transmitter empty: byte sent */
 108 #define LSR_TXRDY       0x20    /* Transmitter buffer empty */
 109 #define LSR_BI          0x10    /* Break detected */
 110 #define LSR_FE          0x08    /* Framing error: bad stop bit */
 111 #define LSR_PE          0x04    /* Parity error */
 112 #define LSR_OE          0x02    /* Overrun, lost incoming byte */
 113 #define LSR_RXRDY       0x01    /* Byte ready in Receive Buffer */
 114 #define LSR_RCV_MASK    0x1f    /* Mask for incoming data or error */
 115
 116 static void
 117 ar5312_putc(dev_t dev, int c)
 118 {
 119         unsigned char   lsr = 0;
 120
 121         while (!(lsr & LSR_TXRDY)) {
 122                 lsr = INB(LSR);
 123         }
 124         OUTB(THR, (char)c);
 125 }
 126
 127 static int
 128 ar5312_getc(dev_t dev)
 129 {
 130         unsigned char   lsr = 0, dat;
 131
 132         while (!(lsr & LSR_RXRDY)) {
 133                 lsr = INB(LSR);
 134         }
 135         dat = INB(RHR);
 136         return (dat);
 137 }
 138
 139 static void
 140 ar5312_flush(dev_t dev)
 141 {
 142         unsigned char   lsr = 0;
 143         while (!(lsr & LSR_TSRE)) {
 144                 lsr = INB(LSR);
 145         }
 146 }
 147
 148
 149 void
 150 ar531x_early_console(void)
 151 {
 152         static struct consdev promcn = {
 153                 .cn_probe = NULL,
 154                 .cn_init = NULL,
 155                 .cn_getc = ar5312_getc,
 156                 .cn_putc = ar5312_putc,
 157                 .cn_pollc = nullcnpollc,
 158                 .cn_bell = NULL,
 159                 .cn_halt = NULL,
 160                 .cn_flush = ar5312_flush,
 161                 .cn_dev = makedev(0, 0),
 162                 .cn_pri = CN_DEAD,
 163         };
 164
 165         cn_tab = &promcn;
 166 }
 167