arch/mips/mips-boards/atlas/atlas_gdb.c

   1 /*
   2  * Carsten Langgaard, carstenl@mips.com
   3  * Copyright (C) 2000 MIPS Technologies, Inc.  All rights reserved.
   4  *
   5  *  This program is free software; you can distribute it and/or modify it
   6  *  under the terms of the GNU General Public License (Version 2) as
   7  *  published by the Free Software Foundation.
   8  *
   9  *  This program is distributed in the hope it will be useful, but WITHOUT
  10  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  *  for more details.
  13  *
  14  *  You should have received a copy of the GNU General Public License along
  15  *  with this program; if not, write to the Free Software Foundation, Inc.,
  16  *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
  17  *
  18  * This is the interface to the remote debugger stub.
  19  */
  20 #include <asm/io.h>
  21 #include <asm/mips-boards/atlas.h>
  22 #include <asm/mips-boards/saa9730_uart.h>
  23
  24 #define INB(a)     inb((unsigned long)a)
  25 #define OUTB(x,a)  outb(x,(unsigned long)a)
  26
  27 /*
  28  * This is the interface to the remote debugger stub
  29  * if the Philips part is used for the debug port,
  30  * called from the platform setup code.
  31  */
  32 void *saa9730_base = (void *)ATLAS_SAA9730_REG;
  33
  34 static int saa9730_kgdb_active = 0;
  35
  36 #define SAA9730_BAUDCLOCK(baud) (((ATLAS_SAA9730_BAUDCLOCK/(baud))/16)-1)
  37
  38 int saa9730_kgdb_hook(int speed)
  39 {
  40         int baudclock;
  41         t_uart_saa9730_regmap *kgdb_uart = (t_uart_saa9730_regmap *)(saa9730_base + SAA9730_UART_REGS_ADDR);
  42
  43         /*
  44          * Clear all interrupts
  45          */
  46         (void) INB(&kgdb_uart->Lsr);
  47         (void) INB(&kgdb_uart->Msr);
  48         (void) INB(&kgdb_uart->Thr_Rbr);
  49         (void) INB(&kgdb_uart->Iir_Fcr);
  50
  51         /*
  52          * Now, initialize the UART
  53          */
  54         /* 8 data bits, one stop bit, no parity */
  55         OUTB(SAA9730_LCR_DATA8, &kgdb_uart->Lcr);
  56
  57         baudclock = SAA9730_BAUDCLOCK(speed);
  58
  59         OUTB((baudclock >> 16) & 0xff, &kgdb_uart->BaudDivMsb);
  60         OUTB( baudclock        & 0xff, &kgdb_uart->BaudDivLsb);
  61
  62         /* Set RTS/DTR active */
  63         OUTB(SAA9730_MCR_DTR | SAA9730_MCR_RTS, &kgdb_uart->Mcr);
  64         saa9730_kgdb_active = 1;
  65
  66         return speed;
  67 }
  68
  69 int saa9730_putDebugChar(char c)
  70 {
  71         t_uart_saa9730_regmap *kgdb_uart = (t_uart_saa9730_regmap *)(saa9730_base + SAA9730_UART_REGS_ADDR);
  72
  73         if (!saa9730_kgdb_active) {     /* need to init device first */
  74                 return 0;
  75         }
  76
  77         while (!(INB(&kgdb_uart->Lsr) & SAA9730_LSR_THRE))
  78                 ;
  79         OUTB(c, &kgdb_uart->Thr_Rbr);
  80
  81         return 1;
  82 }
  83
  84 char saa9730_getDebugChar(void)
  85 {
  86         t_uart_saa9730_regmap *kgdb_uart = (t_uart_saa9730_regmap *)(saa9730_base + SAA9730_UART_REGS_ADDR);
  87         char c;
  88
  89         if (!saa9730_kgdb_active) {     /* need to init device first */
  90                 return 0;
  91         }
  92         while (!(INB(&kgdb_uart->Lsr) & SAA9730_LSR_DR))
  93                 ;
  94
  95         c = INB(&kgdb_uart->Thr_Rbr);
  96         return(c);
  97 }