arch/mips/philips/pnx8550/common/gdb_hook.c

   1 /*
   2  * Carsten Langgaard, carstenl@mips.com
   3  * Copyright (C) 2000 MIPS Technologies, Inc.  All rights reserved.
   4  *
   5  * ########################################################################
   6  *
   7  *  This program is free software; you can distribute it and/or modify it
   8  *  under the terms of the GNU General Public License (Version 2) as
   9  *  published by the Free Software Foundation.
  10  *
  11  *  This program is distributed in the hope it will be useful, but WITHOUT
  12  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  *  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  *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
  19  *
  20  * ########################################################################
  21  *
  22  * This is the interface to the remote debugger stub.
  23  *
  24  */
  25 #include <linux/types.h>
  26 #include <linux/serial.h>
  27 #include <linux/serialP.h>
  28 #include <linux/serial_reg.h>
  29 #include <linux/serial_ip3106.h>
  30
  31 #include <asm/serial.h>
  32 #include <asm/io.h>
  33
  34 #include <uart.h>
  35
  36 static struct serial_state rs_table[IP3106_NR_PORTS] = {
  37 };
  38 static struct async_struct kdb_port_info = {0};
  39
  40 void rs_kgdb_hook(int tty_no)
  41 {
  42         struct serial_state *ser = &rs_table[tty_no];
  43
  44         kdb_port_info.state = ser;
  45         kdb_port_info.magic = SERIAL_MAGIC;
  46         kdb_port_info.port  = tty_no;
  47         kdb_port_info.flags = ser->flags;
  48
  49         /*
  50          * Clear all interrupts
  51          */
  52         /* Clear all the transmitter FIFO counters (pointer and status) */
  53         ip3106_lcr(UART_BASE, tty_no) |= IP3106_UART_LCR_TX_RST;
  54         /* Clear all the receiver FIFO counters (pointer and status) */
  55         ip3106_lcr(UART_BASE, tty_no) |= IP3106_UART_LCR_RX_RST;
  56         /* Clear all interrupts */
  57         ip3106_iclr(UART_BASE, tty_no) = IP3106_UART_INT_ALLRX |
  58                 IP3106_UART_INT_ALLTX;
  59
  60         /*
  61          * Now, initialize the UART
  62          */
  63         ip3106_lcr(UART_BASE, tty_no) = IP3106_UART_LCR_8BIT;
  64         ip3106_baud(UART_BASE, tty_no) = 5; // 38400 Baud
  65 }
  66
  67 int putDebugChar(char c)
  68 {
  69         /* Wait until FIFO not full */
  70         while (((ip3106_fifo(UART_BASE, kdb_port_info.port) & IP3106_UART_FIFO_TXFIFO) >> 16) >= 16)
  71                 ;
  72         /* Send one char */
  73         ip3106_fifo(UART_BASE, kdb_port_info.port) = c;
  74
  75         return 1;
  76 }
  77
  78 char getDebugChar(void)
  79 {
  80         char ch;
  81
  82         /* Wait until there is a char in the FIFO */
  83         while (!((ip3106_fifo(UART_BASE, kdb_port_info.port) &
  84                                         IP3106_UART_FIFO_RXFIFO) >> 8))
  85                 ;
  86         /* Read one char */
  87         ch = ip3106_fifo(UART_BASE, kdb_port_info.port) &
  88                 IP3106_UART_FIFO_RBRTHR;
  89         /* Advance the RX FIFO read pointer */
  90         ip3106_lcr(UART_BASE, kdb_port_info.port) |= IP3106_UART_LCR_RX_NEXT;
  91         return (ch);
  92 }
  93
  94 void rs_disable_debug_interrupts(void)
  95 {
  96         ip3106_ien(UART_BASE, kdb_port_info.port) = 0; /* Disable all interrupts */
  97 }
  98
  99 void rs_enable_debug_interrupts(void)
 100 {
 101         /* Clear all the transmitter FIFO counters (pointer and status) */
 102         ip3106_lcr(UART_BASE, kdb_port_info.port) |= IP3106_UART_LCR_TX_RST;
 103         /* Clear all the receiver FIFO counters (pointer and status) */
 104         ip3106_lcr(UART_BASE, kdb_port_info.port) |= IP3106_UART_LCR_RX_RST;
 105         /* Clear all interrupts */
 106         ip3106_iclr(UART_BASE, kdb_port_info.port) = IP3106_UART_INT_ALLRX |
 107                 IP3106_UART_INT_ALLTX;
 108         ip3106_ien(UART_BASE, kdb_port_info.port)  = IP3106_UART_INT_ALLRX; /* Enable RX interrupts */
 109 }