gdbstub/gdb-support.c.clio

   1 /*
   2  *   These are the low-level serial IO routines for the GDB stub
   3  *   This is platform-specific, since it deals with the serial registers directly
   4  */
   5
   6 #include <linux/serial_reg.h>
   7
   8 #define NEC41XX_SIU_BASE  (0x0c000000 + 0xa0000000)
   9
  10 #define NEC41XX_UART_RX  (UART_RX  + NEC41XX_SIU_BASE)
  11 #define NEC41XX_UART_TX  (UART_TX  + NEC41XX_SIU_BASE)
  12 #define NEC41XX_UART_DLL (UART_DLL + NEC41XX_SIU_BASE)
  13 #define NEC41XX_UART_DLM (UART_DLM + NEC41XX_SIU_BASE)
  14 #define NEC41XX_UART_IER (UART_IER + NEC41XX_SIU_BASE)
  15 #define NEC41XX_UART_IIR (UART_IIR + NEC41XX_SIU_BASE)
  16 #define NEC41XX_UART_FCR (UART_FCR + NEC41XX_SIU_BASE)
  17 #define NEC41XX_UART_LCR (UART_LCR + NEC41XX_SIU_BASE)
  18 #define NEC41XX_UART_MCR (UART_MCR + NEC41XX_SIU_BASE)
  19 #define NEC41XX_UART_LSR (UART_LSR + NEC41XX_SIU_BASE)
  20 #define NEC41XX_UART_MSR (UART_MSR + NEC41XX_SIU_BASE)
  21 #define NEC41XX_UART_IRSEL      (8 + NEC41XX_SIU_BASE)
  22
  23 #define NEC41XX_CMU_CLKMSK  (0x0b000060 + 0xa0000000)
  24 #define NEC41XX_CMU_CLKMSK_MSKFFIR  0x0400
  25 #define NEC41XX_CMU_CLKMSK_MSKSHSP  0x0200
  26 #define NEC41XX_CMU_CLKMSK_MSKSSIU  0x0100
  27 #define NEC41XX_CMU_CLKMSK_MSKDSIU  0x0020
  28 #define NEC41XX_CMU_CLKMSK_MSKFIR   0x0010
  29 #define NEC41XX_CMU_CLKMSK_MSKKIU   0x0008
  30 #define NEC41XX_CMU_CLKMSK_MSKAIU   0x0004
  31 #define NEC41XX_CMU_CLKMSK_MSKSIU   0x0002
  32 #define NEC41XX_CMU_CLKMSK_MSKPIU   0x0001
  33
  34 #define NEC41XX_GIU_PODATL  (0x0b00011c + 0xa0000000)
  35 #define NEC41XX_GIU_PODATL_GPIO47  0x8000
  36 #define NEC41XX_GIU_PODATL_GPIO46  0x4000
  37 #define NEC41XX_GIU_PODATL_GPIO45  0x2000
  38 #define NEC41XX_GIU_PODATL_GPIO44  0x1000
  39 #define NEC41XX_GIU_PODATL_GPIO43  0x0800
  40 #define NEC41XX_GIU_PODATL_GPIO42  0x0400
  41 #define NEC41XX_GIU_PODATL_GPIO41  0x0200
  42 #define NEC41XX_GIU_PODATL_GPIO40  0x0100
  43 #define NEC41XX_GIU_PODATL_GPIO39  0x0080
  44 #define NEC41XX_GIU_PODATL_GPIO38  0x0040
  45 #define NEC41XX_GIU_PODATL_GPIO37  0x0020
  46 #define NEC41XX_GIU_PODATL_GPIO36  0x0010
  47 #define NEC41XX_GIU_PODATL_GPIO35  0x0008
  48 #define NEC41XX_GIU_PODATL_GPIO34  0x0004
  49 #define NEC41XX_GIU_PODATL_GPIO33  0x0002
  50 #define NEC41XX_GIU_PODATL_GPIO32  0x0001
  51
  52 void DbgInitSerial(void);
  53
  54 static int initialized = 0;
  55
  56 void DbgInitSerial(void)
  57 {
  58         unsigned char dummy;
  59
  60                 /* turn on GPIO42, probably controls power to external serial transceiver */
  61         *(unsigned short*)NEC41XX_GIU_PODATL |= NEC41XX_GIU_PODATL_GPIO42;
  62
  63                 /* turn on the clocks to the serial port */
  64         *(unsigned short*)NEC41XX_CMU_CLKMSK |= NEC41XX_CMU_CLKMSK_MSKSSIU |
  65                                                                  NEC41XX_CMU_CLKMSK_MSKSIU;
  66
  67         *(unsigned char*)NEC41XX_UART_IRSEL = 0;        /* set for RS232C, not IrDA */
  68
  69         *(unsigned char*)NEC41XX_UART_LCR = UART_LCR_DLAB;      /* prepare to set baud rate */
  70         *(unsigned char*)NEC41XX_UART_DLL = 10;
  71         *(unsigned char*)NEC41XX_UART_DLM = 0;                  /* hardcoded: set to 115200 */
  72         *(unsigned char*)NEC41XX_UART_LCR = UART_LCR_WLEN8;     /* clear DLAB, set up for 8N1 */
  73
  74         *(unsigned char*)NEC41XX_UART_IER = 0;                  /* disable interrupts */
  75
  76         *(unsigned char*)NEC41XX_UART_FCR = UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT;
  77         *(unsigned char*)NEC41XX_UART_FCR = 0;                  /* clear FIFO and disable it */
  78
  79         *(unsigned char*)NEC41XX_UART_MCR = UART_MCR_RTS | UART_MCR_DTR;  /* set RTS and DTR */
  80
  81         dummy = *(unsigned char *)NEC41XX_UART_RX;              /* clear any pending ints */
  82         dummy = *(unsigned char *)NEC41XX_UART_MSR;
  83         dummy = *(unsigned char *)NEC41XX_UART_IIR;
  84
  85         while ( *(unsigned char*)NEC41XX_UART_LSR & UART_LSR_DR ) /* clear the receive buffer */
  86                 dummy = *(unsigned char *)NEC41XX_UART_RX;      /* (and finish clearing ints) */
  87 }
  88
  89
  90 int putDebugChar(unsigned char c)
  91 {
  92         if (!initialized) {             /* need to init device first */
  93                 DbgInitSerial();
  94                 initialized = 1;
  95         }
  96
  97         while ( !(*(unsigned char*)NEC41XX_UART_LSR & UART_LSR_THRE) ) ;
  98
  99         *(unsigned char *)NEC41XX_UART_TX = c;
 100
 101         return 1;
 102 }
 103
 104
 105 char getDebugChar(void)
 106 {
 107         if (!initialized) {             /* need to init device first */
 108                 DbgInitSerial();
 109                 initialized = 1;
 110         }
 111
 112         while ( !(*(unsigned char*)NEC41XX_UART_LSR & UART_LSR_DR) ) ;
 113
 114         return(*(char *)NEC41XX_UART_RX);
 115 }