serial.c 3.5 KB

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  1. /*
  2. * (C) Copyright 2002
  3. * Wolfgang Denk, DENX Software Engineering, <wd@denx.de>
  4. *
  5. * (C) Copyright 2002
  6. * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
  7. * Marius Groeger <mgroeger@sysgo.de>
  8. *
  9. * (C) Copyright 2002
  10. * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
  11. * Alex Zuepke <azu@sysgo.de>
  12. *
  13. * Copyright (C) 1999 2000 2001 Erik Mouw (J.A.K.Mouw@its.tudelft.nl)
  14. *
  15. * This program is free software; you can redistribute it and/or modify
  16. * it under the terms of the GNU General Public License as published by
  17. * the Free Software Foundation; either version 2 of the License, or
  18. * (at your option) any later version.
  19. *
  20. * This program is distributed in the hope that it will be useful,
  21. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  22. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  23. * GNU General Public License for more details.
  24. *
  25. * You should have received a copy of the GNU General Public License
  26. * along with this program; if not, write to the Free Software
  27. * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  28. *
  29. */
  30. #include <common.h>
  31. #include <asm/arch/pxa-regs.h>
  32. void serial_setbrg (void)
  33. {
  34. DECLARE_GLOBAL_DATA_PTR;
  35. unsigned int quot = 0;
  36. if (gd->baudrate == 1200)
  37. quot = 192;
  38. else if (gd->baudrate == 9600)
  39. quot = 96;
  40. else if (gd->baudrate == 19200)
  41. quot = 48;
  42. else if (gd->baudrate == 38400)
  43. quot = 24;
  44. else if (gd->baudrate == 57600)
  45. quot = 16;
  46. else if (gd->baudrate == 115200)
  47. quot = 8;
  48. else
  49. hang ();
  50. #ifdef CONFIG_FFUART
  51. CKEN |= CKEN6_FFUART;
  52. FFIER = 0; /* Disable for now */
  53. FFFCR = 0; /* No fifos enabled */
  54. /* set baud rate */
  55. FFLCR = LCR_WLS0 | LCR_WLS1 | LCR_DLAB;
  56. FFDLL = quot & 0xff;
  57. FFDLH = quot >> 8;
  58. FFLCR = LCR_WLS0 | LCR_WLS1;
  59. FFIER = IER_UUE; /* Enable FFUART */
  60. #elif defined(CONFIG_BTUART)
  61. CKEN |= CKEN7_BTUART;
  62. BTIER = 0;
  63. BTFCR = 0;
  64. /* set baud rate */
  65. BTLCR = LCR_DLAB;
  66. BTDLL = quot & 0xff;
  67. BTDLH = quot >> 8;
  68. BTLCR = LCR_WLS0 | LCR_WLS1;
  69. BTIER = IER_UUE; /* Enable BFUART */
  70. #elif defined(CONFIG_STUART)
  71. #error "Bad: not implemented yet!"
  72. #else
  73. #error "Bad: you didn't configured serial ..."
  74. #endif
  75. }
  76. /*
  77. * Initialise the serial port with the given baudrate. The settings
  78. * are always 8 data bits, no parity, 1 stop bit, no start bits.
  79. *
  80. */
  81. int serial_init (void)
  82. {
  83. serial_setbrg ();
  84. return (0);
  85. }
  86. /*
  87. * Output a single byte to the serial port.
  88. */
  89. void serial_putc (const char c)
  90. {
  91. #ifdef CONFIG_FFUART
  92. /* wait for room in the tx FIFO on FFUART */
  93. while ((FFLSR & LSR_TEMT) == 0);
  94. FFTHR = c;
  95. #elif defined(CONFIG_BTUART)
  96. while ((BTLSR & LSR_TEMT ) == 0 );
  97. BTTHR = c;
  98. #elif defined(CONFIG_STUART)
  99. #endif
  100. /* If \n, also do \r */
  101. if (c == '\n')
  102. serial_putc ('\r');
  103. }
  104. /*
  105. * Read a single byte from the serial port. Returns 1 on success, 0
  106. * otherwise. When the function is succesfull, the character read is
  107. * written into its argument c.
  108. */
  109. int serial_tstc (void)
  110. {
  111. #ifdef CONFIG_FFUART
  112. return FFLSR & LSR_DR;
  113. #elif defined(CONFIG_BTUART)
  114. return BTLSR & LSR_DR;
  115. #elif defined(CONFIG_STUART)
  116. #endif
  117. }
  118. /*
  119. * Read a single byte from the serial port. Returns 1 on success, 0
  120. * otherwise. When the function is succesfull, the character read is
  121. * written into its argument c.
  122. */
  123. int serial_getc (void)
  124. {
  125. #ifdef CONFIG_FFUART
  126. while (!(FFLSR & LSR_DR));
  127. return (char) FFRBR & 0xff;
  128. #elif defined(CONFIG_BTUART)
  129. while (!(BTLSR & LSR_DR));
  130. return (char) BTRBR & 0xff;
  131. #elif defined(CONFIG_STUART)
  132. #endif
  133. }
  134. void
  135. serial_puts (const char *s)
  136. {
  137. while (*s) {
  138. serial_putc (*s++);
  139. }
  140. }