arch/mips/au1000/common/dbg_io.c

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