arch/mips/ite-boards/generic/dbg_io.c

   1
   2
   3 #ifdef CONFIG_KGDB
   4
   5 /* --- CONFIG --- */
   6
   7 /* we need uint32 uint8 */
   8 /* #include "types.h" */
   9 typedef unsigned char uint8;
  10 typedef unsigned int uint32;
  11
  12 /* --- END OF CONFIG --- */
  13
  14 #define         UART16550_BAUD_2400             2400
  15 #define         UART16550_BAUD_4800             4800
  16 #define         UART16550_BAUD_9600             9600
  17 #define         UART16550_BAUD_19200            19200
  18 #define         UART16550_BAUD_38400            38400
  19 #define         UART16550_BAUD_57600            57600
  20 #define         UART16550_BAUD_115200           115200
  21
  22 #define         UART16550_PARITY_NONE           0
  23 #define         UART16550_PARITY_ODD            0x08
  24 #define         UART16550_PARITY_EVEN           0x18
  25 #define         UART16550_PARITY_MARK           0x28
  26 #define         UART16550_PARITY_SPACE          0x38
  27
  28 #define         UART16550_DATA_5BIT             0x0
  29 #define         UART16550_DATA_6BIT             0x1
  30 #define         UART16550_DATA_7BIT             0x2
  31 #define         UART16550_DATA_8BIT             0x3
  32
  33 #define         UART16550_STOP_1BIT             0x0
  34 #define         UART16550_STOP_2BIT             0x4
  35
  36 /* ----------------------------------------------------- */
  37
  38 /* === CONFIG === */
  39
  40 /* [stevel] we use the IT8712 serial port for kgdb */
  41 #define DEBUG_BASE  0xB40003F8  /* 8712 serial port 1 base address */
  42 #define MAX_BAUD    115200
  43
  44 /* === END OF CONFIG === */
  45
  46 /* register offset */
  47 #define         OFS_RCV_BUFFER          0
  48 #define         OFS_TRANS_HOLD          0
  49 #define         OFS_SEND_BUFFER         0
  50 #define         OFS_INTR_ENABLE         1
  51 #define         OFS_INTR_ID             2
  52 #define         OFS_DATA_FORMAT         3
  53 #define         OFS_LINE_CONTROL        3
  54 #define         OFS_MODEM_CONTROL       4
  55 #define         OFS_RS232_OUTPUT        4
  56 #define         OFS_LINE_STATUS         5
  57 #define         OFS_MODEM_STATUS        6
  58 #define         OFS_RS232_INPUT         6
  59 #define         OFS_SCRATCH_PAD         7
  60
  61 #define         OFS_DIVISOR_LSB         0
  62 #define         OFS_DIVISOR_MSB         1
  63
  64
  65 /* memory-mapped read/write of the port */
  66 #define UART16550_READ(y)    (*((volatile uint8*)(DEBUG_BASE + y)))
  67 #define UART16550_WRITE(y,z) ((*((volatile uint8*)(DEBUG_BASE + y))) = z)
  68
  69 void debugInit(uint32 baud, uint8 data, uint8 parity, uint8 stop)
  70 {
  71         /* disable interrupts */
  72         UART16550_WRITE(OFS_INTR_ENABLE, 0);
  73
  74         /* set up baud rate */
  75         {
  76                 uint32 divisor;
  77
  78                 /* set DIAB bit */
  79                 UART16550_WRITE(OFS_LINE_CONTROL, 0x80);
  80
  81                 /* set divisor */
  82                 divisor = MAX_BAUD / baud;
  83                 UART16550_WRITE(OFS_DIVISOR_LSB, divisor & 0xff);
  84                 UART16550_WRITE(OFS_DIVISOR_MSB, (divisor & 0xff00) >> 8);
  85
  86                 /* clear DIAB bit */
  87                 UART16550_WRITE(OFS_LINE_CONTROL, 0x0);
  88         }
  89
  90         /* set data format */
  91         UART16550_WRITE(OFS_DATA_FORMAT, data | parity | stop);
  92 }
  93
  94 static int remoteDebugInitialized = 0;
  95
  96 uint8 getDebugChar(void)
  97 {
  98         if (!remoteDebugInitialized) {
  99                 remoteDebugInitialized = 1;
 100                 debugInit(UART16550_BAUD_115200,
 101                           UART16550_DATA_8BIT,
 102                           UART16550_PARITY_NONE, UART16550_STOP_1BIT);
 103         }
 104
 105         while ((UART16550_READ(OFS_LINE_STATUS) & 0x1) == 0);
 106         return UART16550_READ(OFS_RCV_BUFFER);
 107 }
 108
 109
 110 int putDebugChar(uint8 byte)
 111 {
 112         if (!remoteDebugInitialized) {
 113                 remoteDebugInitialized = 1;
 114                 debugInit(UART16550_BAUD_115200,
 115                           UART16550_DATA_8BIT,
 116                           UART16550_PARITY_NONE, UART16550_STOP_1BIT);
 117         }
 118
 119         while ((UART16550_READ(OFS_LINE_STATUS) & 0x20) == 0);
 120         UART16550_WRITE(OFS_SEND_BUFFER, byte);
 121         return 1;
 122 }
 123
 124 #endif