arch/ppc/syslib/ppc4xx_kgdb.c

   1 #include <linux/config.h>
   2 #include <linux/types.h>
   3 #include <asm/ibm4xx.h>
   4 #include <linux/kernel.h>
   5
   6
   7
   8 #define LSR_DR          0x01 /* Data ready */
   9 #define LSR_OE          0x02 /* Overrun */
  10 #define LSR_PE          0x04 /* Parity error */
  11 #define LSR_FE          0x08 /* Framing error */
  12 #define LSR_BI          0x10 /* Break */
  13 #define LSR_THRE        0x20 /* Xmit holding register empty */
  14 #define LSR_TEMT        0x40 /* Xmitter empty */
  15 #define LSR_ERR         0x80 /* Error */
  16
  17 #include <platforms/4xx/ibm_ocp.h>
  18
  19 extern struct NS16550* COM_PORTS[];
  20 #ifndef NULL
  21 #define NULL 0x00
  22 #endif
  23
  24 static volatile struct NS16550 *kgdb_debugport = NULL;
  25
  26 volatile struct NS16550 *
  27 NS16550_init(int chan)
  28 {
  29         volatile struct NS16550 *com_port;
  30         int quot;
  31 #ifdef BASE_BAUD
  32         quot = BASE_BAUD / 9600;
  33 #else
  34         quot = 0x000c; /* 0xc = 9600 baud (on a pc) */
  35 #endif
  36
  37         com_port = (struct NS16550 *) COM_PORTS[chan];
  38
  39         com_port->lcr = 0x00;
  40         com_port->ier = 0xFF;
  41         com_port->ier = 0x00;
  42         com_port->lcr = com_port->lcr | 0x80; /* Access baud rate */
  43         com_port->dll = ( quot & 0x00ff ); /* 0xc = 9600 baud */
  44         com_port->dlm = ( quot & 0xff00 ) >> 8;
  45         com_port->lcr = 0x03; /* 8 data, 1 stop, no parity */
  46         com_port->mcr = 0x00; /* RTS/DTR */
  47         com_port->fcr = 0x07; /* Clear & enable FIFOs */
  48
  49         return( com_port );
  50 }
  51
  52
  53 void
  54 NS16550_putc(volatile struct NS16550 *com_port, unsigned char c)
  55 {
  56         while ((com_port->lsr & LSR_THRE) == 0)
  57                 ;
  58         com_port->thr = c;
  59         return;
  60 }
  61
  62 unsigned char
  63 NS16550_getc(volatile struct NS16550 *com_port)
  64 {
  65         while ((com_port->lsr & LSR_DR) == 0)
  66                 ;
  67         return (com_port->rbr);
  68 }
  69
  70 unsigned char
  71 NS16550_tstc(volatile struct NS16550 *com_port)
  72 {
  73         return ((com_port->lsr & LSR_DR) != 0);
  74 }
  75
  76
  77 #if defined(CONFIG_KGDB_TTYS0)
  78 #define KGDB_PORT 0
  79 #elif defined(CONFIG_KGDB_TTYS1)
  80 #define KGDB_PORT 1
  81 #elif defined(CONFIG_KGDB_TTYS2)
  82 #define KGDB_PORT 2
  83 #elif defined(CONFIG_KGDB_TTYS3)
  84 #define KGDB_PORT 3
  85 #else
  86 #error "invalid kgdb_tty port"
  87 #endif
  88
  89 void putDebugChar( unsigned char c )
  90 {
  91         if ( kgdb_debugport == NULL )
  92                 kgdb_debugport = NS16550_init(KGDB_PORT);
  93         NS16550_putc( kgdb_debugport, c );
  94 }
  95
  96 int getDebugChar( void )
  97 {
  98         if (kgdb_debugport == NULL)
  99                 kgdb_debugport = NS16550_init(KGDB_PORT);
 100
 101         return(NS16550_getc(kgdb_debugport));
 102 }
 103
 104 void kgdb_interruptible(int enable)
 105 {
 106         return;
 107 }
 108
 109 void putDebugString(char* str)
 110 {
 111         while (*str != '\0') {
 112                 putDebugChar(*str);
 113                 str++;
 114         }
 115         putDebugChar('\r');
 116         return;
 117 }
 118
 119 void
 120 kgdb_map_scc(void)
 121 {
 122         printk("kgdb init \n");
 123         kgdb_debugport = NS16550_init(KGDB_PORT);
 124 }