arch/mips/au1000/common/dbg_io.c

   1
   2 #include <asm/io.h>
   3 #include <asm/mach-au1x00/au1000.h>
   4
   5 #ifdef CONFIG_KGDB
   6
   7 /*
   8  * FIXME the user should be able to select the
   9  * uart to be used for debugging.
  10  */
  11 #define DEBUG_BASE  UART_DEBUG_BASE
  12 /**/
  13
  14 /* we need uint32 uint8 */
  15 /* #include "types.h" */
  16 typedef         unsigned char uint8;
  17 typedef         unsigned int  uint32;
  18
  19 #define         UART16550_BAUD_2400             2400
  20 #define         UART16550_BAUD_4800             4800
  21 #define         UART16550_BAUD_9600             9600
  22 #define         UART16550_BAUD_19200            19200
  23 #define         UART16550_BAUD_38400            38400
  24 #define         UART16550_BAUD_57600            57600
  25 #define         UART16550_BAUD_115200           115200
  26
  27 #define         UART16550_PARITY_NONE           0
  28 #define         UART16550_PARITY_ODD            0x08
  29 #define         UART16550_PARITY_EVEN           0x18
  30 #define         UART16550_PARITY_MARK           0x28
  31 #define         UART16550_PARITY_SPACE          0x38
  32
  33 #define         UART16550_DATA_5BIT             0x0
  34 #define         UART16550_DATA_6BIT             0x1
  35 #define         UART16550_DATA_7BIT             0x2
  36 #define         UART16550_DATA_8BIT             0x3
  37
  38 #define         UART16550_STOP_1BIT             0x0
  39 #define         UART16550_STOP_2BIT             0x4
  40
  41
  42 #define UART_RX         0       /* Receive buffer */
  43 #define UART_TX         4       /* Transmit buffer */
  44 #define UART_IER        8       /* Interrupt Enable Register */
  45 #define UART_IIR        0xC     /* Interrupt ID Register */
  46 #define UART_FCR        0x10    /* FIFO Control Register */
  47 #define UART_LCR        0x14    /* Line Control Register */
  48 #define UART_MCR        0x18    /* Modem Control Register */
  49 #define UART_LSR        0x1C    /* Line Status Register */
  50 #define UART_MSR        0x20    /* Modem Status Register */
  51 #define UART_CLK        0x28    /* Baud Rat4e Clock Divider */
  52 #define UART_MOD_CNTRL  0x100   /* Module Control */
  53
  54 /* memory-mapped read/write of the port */
  55 #define UART16550_READ(y)    (au_readl(DEBUG_BASE + y) & 0xff)
  56 #define UART16550_WRITE(y, z) (au_writel(z&0xff, DEBUG_BASE + y))
  57
  58 extern unsigned long get_au1x00_uart_baud_base(void);
  59 extern unsigned long cal_r4koff(void);
  60
  61 void debugInit(uint32 baud, uint8 data, uint8 parity, uint8 stop)
  62 {
  63
  64         if (UART16550_READ(UART_MOD_CNTRL) != 0x3) {
  65                 UART16550_WRITE(UART_MOD_CNTRL, 3);
  66         }
  67         cal_r4koff();
  68
  69         /* disable interrupts */
  70         UART16550_WRITE(UART_IER, 0);
  71
  72         /* set up baud rate */
  73         {
  74                 uint32 divisor;
  75
  76                 /* set divisor */
  77                 divisor = get_au1x00_uart_baud_base() / baud;
  78                 UART16550_WRITE(UART_CLK, divisor & 0xffff);
  79         }
  80
  81         /* set data format */
  82         UART16550_WRITE(UART_LCR, (data | parity | stop));
  83 }
  84
  85 static int remoteDebugInitialized = 0;
  86
  87 uint8 getDebugChar(void)
  88 {
  89         if (!remoteDebugInitialized) {
  90                 remoteDebugInitialized = 1;
  91                 debugInit(UART16550_BAUD_115200,
  92                           UART16550_DATA_8BIT,
  93                           UART16550_PARITY_NONE,
  94                           UART16550_STOP_1BIT);
  95         }
  96
  97         while((UART16550_READ(UART_LSR) & 0x1) == 0);
  98         return UART16550_READ(UART_RX);
  99 }
 100
 101
 102 int putDebugChar(uint8 byte)
 103 {
 104 //      int i;
 105
 106         if (!remoteDebugInitialized) {
 107                 remoteDebugInitialized = 1;
 108                 debugInit(UART16550_BAUD_115200,
 109                           UART16550_DATA_8BIT,
 110                           UART16550_PARITY_NONE,
 111                           UART16550_STOP_1BIT);
 112         }
 113
 114         while ((UART16550_READ(UART_LSR)&0x40) == 0);
 115         UART16550_WRITE(UART_TX, byte);
 116         //for (i=0;i<0xfff;i++);
 117
 118         return 1;
 119 }
 120
 121 #endif