board/cogent/serial.c

   1 /*
   2  * Simple serial driver for Cogent motherboard serial ports
   3  * for use during boot
   4  */
   5
   6 #include <common.h>
   7 #include <board/cogent/serial.h>
   8
   9 DECLARE_GLOBAL_DATA_PTR;
  10
  11 #if (CMA_MB_CAPS & CMA_MB_CAP_SERPAR)
  12
  13 #if (defined(CONFIG_8xx) && defined(CONFIG_8xx_CONS_NONE)) || \
  14      (defined(CONFIG_8260) && defined(CONFIG_CONS_NONE))
  15
  16 #if CONFIG_CONS_INDEX == 1
  17 #define CMA_MB_SERIAL_BASE      CMA_MB_SERIALA_BASE
  18 #elif CONFIG_CONS_INDEX == 2
  19 #define CMA_MB_SERIAL_BASE      CMA_MB_SERIALB_BASE
  20 #elif CONFIG_CONS_INDEX == 3 && (CMA_MB_CAPS & CMA_MB_CAP_SER2)
  21 #define CMA_MB_SERIAL_BASE      CMA_MB_SER2A_BASE
  22 #elif CONFIG_CONS_INDEX == 4 && (CMA_MB_CAPS & CMA_MB_CAP_SER2)
  23 #define CMA_MB_SERIAL_BASE      CMA_MB_SER2B_BASE
  24 #else
  25 #error CONFIG_CONS_INDEX must be configured for Cogent motherboard serial
  26 #endif
  27
  28 int serial_init (void)
  29 {
  30         cma_mb_serial *mbsp = (cma_mb_serial *) CMA_MB_SERIAL_BASE;
  31
  32         cma_mb_reg_write (&mbsp->ser_ier, 0x00);        /* turn off interrupts */
  33         serial_setbrg ();
  34         cma_mb_reg_write (&mbsp->ser_lcr, 0x03);        /* 8 data, 1 stop, no parity */
  35         cma_mb_reg_write (&mbsp->ser_mcr, 0x03);        /* RTS/DTR */
  36         cma_mb_reg_write (&mbsp->ser_fcr, 0x07);        /* Clear & enable FIFOs */
  37
  38         return (0);
  39 }
  40
  41 void serial_setbrg (void)
  42 {
  43         cma_mb_serial *mbsp = (cma_mb_serial *) CMA_MB_SERIAL_BASE;
  44         unsigned int divisor;
  45         unsigned char lcr;
  46
  47         if ((divisor = br_to_div (gd->baudrate)) == 0)
  48                 divisor = DEFDIV;
  49
  50         lcr = cma_mb_reg_read (&mbsp->ser_lcr);
  51         cma_mb_reg_write (&mbsp->ser_lcr, lcr | 0x80);  /* Access baud rate(set DLAB) */
  52         cma_mb_reg_write (&mbsp->ser_brl, divisor & 0xff);
  53         cma_mb_reg_write (&mbsp->ser_brh, (divisor >> 8) & 0xff);
  54         cma_mb_reg_write (&mbsp->ser_lcr, lcr); /* unset DLAB */
  55 }
  56
  57 void serial_putc (const char c)
  58 {
  59         cma_mb_serial *mbsp = (cma_mb_serial *) CMA_MB_SERIAL_BASE;
  60
  61         if (c == '\n')
  62                 serial_putc ('\r');
  63
  64         while ((cma_mb_reg_read (&mbsp->ser_lsr) & LSR_THRE) == 0);
  65
  66         cma_mb_reg_write (&mbsp->ser_thr, c);
  67 }
  68
  69 void serial_puts (const char *s)
  70 {
  71         while (*s != '\0')
  72                 serial_putc (*s++);
  73 }
  74
  75 int serial_getc (void)
  76 {
  77         cma_mb_serial *mbsp = (cma_mb_serial *) CMA_MB_SERIAL_BASE;
  78
  79         while ((cma_mb_reg_read (&mbsp->ser_lsr) & LSR_DR) == 0);
  80
  81         return ((int) cma_mb_reg_read (&mbsp->ser_rhr) & 0x7f);
  82 }
  83
  84 int serial_tstc (void)
  85 {
  86         cma_mb_serial *mbsp = (cma_mb_serial *) CMA_MB_SERIAL_BASE;
  87
  88         return ((cma_mb_reg_read (&mbsp->ser_lsr) & LSR_DR) != 0);
  89 }
  90
  91 #endif /* CONS_NONE */
  92
  93 #if defined(CONFIG_CMD_KGDB) && \
  94     defined(CONFIG_KGDB_NONE)
  95
  96 #if CONFIG_KGDB_INDEX == CONFIG_CONS_INDEX
  97 #error Console and kgdb are on the same serial port - this is not supported
  98 #endif
  99
 100 #if CONFIG_KGDB_INDEX == 1
 101 #define CMA_MB_KGDB_SER_BASE    CMA_MB_SERIALA_BASE
 102 #elif CONFIG_KGDB_INDEX == 2
 103 #define CMA_MB_KGDB_SER_BASE    CMA_MB_SERIALB_BASE
 104 #elif CONFIG_KGDB_INDEX == 3 && (CMA_MB_CAPS & CMA_MB_CAP_SER2)
 105 #define CMA_MB_KGDB_SER_BASE    CMA_MB_SER2A_BASE
 106 #elif CONFIG_KGDB_INDEX == 4 && (CMA_MB_CAPS & CMA_MB_CAP_SER2)
 107 #define CMA_MB_KGDB_SER_BASE    CMA_MB_SER2B_BASE
 108 #else
 109 #error CONFIG_KGDB_INDEX must be configured for Cogent motherboard serial
 110 #endif
 111
 112 void kgdb_serial_init (void)
 113 {
 114         cma_mb_serial *mbsp = (cma_mb_serial *) CMA_MB_KGDB_SER_BASE;
 115         unsigned int divisor;
 116
 117         if ((divisor = br_to_div (CONFIG_KGDB_BAUDRATE)) == 0)
 118                 divisor = DEFDIV;
 119
 120         cma_mb_reg_write (&mbsp->ser_ier, 0x00);        /* turn off interrupts */
 121         cma_mb_reg_write (&mbsp->ser_lcr, 0x80);        /* Access baud rate(set DLAB) */
 122         cma_mb_reg_write (&mbsp->ser_brl, divisor & 0xff);
 123         cma_mb_reg_write (&mbsp->ser_brh, (divisor >> 8) & 0xff);
 124         cma_mb_reg_write (&mbsp->ser_lcr, 0x03);        /* 8 data, 1 stop, no parity */
 125         cma_mb_reg_write (&mbsp->ser_mcr, 0x03);        /* RTS/DTR */
 126         cma_mb_reg_write (&mbsp->ser_fcr, 0x07);        /* Clear & enable FIFOs */
 127
 128         printf ("[on cma10x serial port B] ");
 129 }
 130
 131 void putDebugChar (int c)
 132 {
 133         cma_mb_serial *mbsp = (cma_mb_serial *) CMA_MB_KGDB_SER_BASE;
 134
 135         while ((cma_mb_reg_read (&mbsp->ser_lsr) & LSR_THRE) == 0);
 136
 137         cma_mb_reg_write (&mbsp->ser_thr, c & 0xff);
 138 }
 139
 140 void putDebugStr (const char *str)
 141 {
 142         while (*str != '\0') {
 143                 if (*str == '\n')
 144                         putDebugChar ('\r');
 145                 putDebugChar (*str++);
 146         }
 147 }
 148
 149 int getDebugChar (void)
 150 {
 151         cma_mb_serial *mbsp = (cma_mb_serial *) CMA_MB_KGDB_SER_BASE;
 152
 153         while ((cma_mb_reg_read (&mbsp->ser_lsr) & LSR_DR) == 0);
 154
 155         return ((int) cma_mb_reg_read (&mbsp->ser_rhr) & 0x7f);
 156 }
 157
 158 void kgdb_interruptible (int yes)
 159 {
 160         cma_mb_serial *mbsp = (cma_mb_serial *) CMA_MB_KGDB_SER_BASE;
 161
 162         if (yes == 1) {
 163                 printf ("kgdb: turning serial ints on\n");
 164                 cma_mb_reg_write (&mbsp->ser_ier, 0xf);
 165         } else {
 166                 printf ("kgdb: turning serial ints off\n");
 167                 cma_mb_reg_write (&mbsp->ser_ier, 0x0);
 168         }
 169 }
 170
 171 #endif /* KGDB && KGDB_NONE */
 172
 173 #endif /* CAPS & SERPAR */