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TOMOYO Linux Cross Reference
Linux/arch/powerpc/platforms/cell/beat_udbg.c

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  1 /*
  2  * udbg function for Beat
  3  *
  4  * (C) Copyright 2006 TOSHIBA CORPORATION
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License as published by
  8  * the Free Software Foundation; either version 2 of the License, or
  9  * (at your option) any later version.
 10  *
 11  * This program is distributed in the hope that it will be useful,
 12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 14  * GNU General Public License for more details.
 15  *
 16  * You should have received a copy of the GNU General Public License along
 17  * with this program; if not, write to the Free Software Foundation, Inc.,
 18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 19  */
 20 
 21 #include <linux/kernel.h>
 22 #include <linux/console.h>
 23 
 24 #include <asm/machdep.h>
 25 #include <asm/prom.h>
 26 #include <asm/udbg.h>
 27 
 28 #include "beat.h"
 29 
 30 #define celleb_vtermno  0
 31 
 32 static void udbg_putc_beat(char c)
 33 {
 34         unsigned long rc;
 35 
 36         if (c == '\n')
 37                 udbg_putc_beat('\r');
 38 
 39         rc = beat_put_term_char(celleb_vtermno, 1, (uint64_t)c << 56, 0);
 40 }
 41 
 42 /* Buffered chars getc */
 43 static u64 inbuflen;
 44 static u64 inbuf[2];    /* must be 2 u64s */
 45 
 46 static int udbg_getc_poll_beat(void)
 47 {
 48         /* The interface is tricky because it may return up to 16 chars.
 49          * We save them statically for future calls to udbg_getc().
 50          */
 51         char ch, *buf = (char *)inbuf;
 52         int i;
 53         long rc;
 54         if (inbuflen == 0) {
 55                 /* get some more chars. */
 56                 inbuflen = 0;
 57                 rc = beat_get_term_char(celleb_vtermno, &inbuflen,
 58                                         inbuf+0, inbuf+1);
 59                 if (rc != 0)
 60                         inbuflen = 0;   /* otherwise inbuflen is garbage */
 61         }
 62         if (inbuflen <= 0 || inbuflen > 16) {
 63                 /* Catch error case as well as other oddities (corruption) */
 64                 inbuflen = 0;
 65                 return -1;
 66         }
 67         ch = buf[0];
 68         for (i = 1; i < inbuflen; i++)  /* shuffle them down. */
 69                 buf[i-1] = buf[i];
 70         inbuflen--;
 71         return ch;
 72 }
 73 
 74 static int udbg_getc_beat(void)
 75 {
 76         int ch;
 77         for (;;) {
 78                 ch = udbg_getc_poll_beat();
 79                 if (ch == -1) {
 80                         /* This shouldn't be needed...but... */
 81                         volatile unsigned long delay;
 82                         for (delay = 0; delay < 2000000; delay++)
 83                                 ;
 84                 } else {
 85                         return ch;
 86                 }
 87         }
 88 }
 89 
 90 /* call this from early_init() for a working debug console on
 91  * vterm capable LPAR machines
 92  */
 93 void __init udbg_init_debug_beat(void)
 94 {
 95         udbg_putc = udbg_putc_beat;
 96         udbg_getc = udbg_getc_beat;
 97         udbg_getc_poll = udbg_getc_poll_beat;
 98 }
 99 

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