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oldlatches.c
Package: linux-2.4.20.tar.gz　[view]
Upload User: jlfgdled
Upload Date: 2013-04-10
Package Size: 33168k
Code Size: 2k
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Linux-Unix program

Development Platform:

Unix_Linux

oldlatches.c：Code Content
  1. /*
  2.  *  linux/arch/arm/kernel/oldlatches.c
  3.  *
  4.  *  Copyright (C) David Alan Gilbert 1995/1996,2000
  5.  *
  6.  * This program is free software; you can redistribute it and/or modify
  7.  * it under the terms of the GNU General Public License version 2 as
  8.  * published by the Free Software Foundation.
  9.  *
  10.  *  Support for the latches on the old Archimedes which control the floppy,
  11.  *  hard disc and printer
  12.  */
  13. #include <linux/module.h>
  14. #include <linux/kernel.h>
  15. #include <linux/init.h>
  16. #include <linux/sched.h>
  18. #include <asm/io.h>
  19. #include <asm/hardware.h>
  20. #include <asm/mach-types.h>
  21. #include <asm/arch/oldlatches.h>
  23. static unsigned char latch_a_copy;
  24. static unsigned char latch_b_copy;
  26. /* newval=(oldval & ~mask)|newdata */
  27. void oldlatch_aupdate(unsigned char mask,unsigned char newdata)
  28. {
  29. if (machine_is_archimedes()) {
  30. unsigned long flags;
  32. local_save_flags(flags);
  33. latch_a_copy = (latch_a_copy & ~mask) | newdata;
  34. __raw_writeb(latch_a_copy, LATCHA_BASE);
  35. local_restore_flags(flags);
  37. printk("Latch: A = 0x%02xn", latch_a_copy);
  38. } else
  39. BUG();
  40. }
  43. /* newval=(oldval & ~mask)|newdata */
  44. void oldlatch_bupdate(unsigned char mask,unsigned char newdata)
  45. {
  46. if (machine_is_archimedes()) {
  47. unsigned long flags;
  49. local_save_flags(flags);
  50. latch_b_copy = (latch_b_copy & ~mask) | newdata;
  51. __raw_writeb(latch_b_copy, LATCHB_BASE);
  52. local_restore_flags(flags);
  54. printk("Latch: B = 0x%02xn", latch_b_copy);
  55. } else
  56. BUG();
  57. }
  59. static int __init oldlatch_init(void)
  60. {
  61. if (machine_is_archimedes()) {
  62. oldlatch_aupdate(0xff, 0xff);
  63. /* Thats no FDC reset...*/
  64. oldlatch_bupdate(0xff, LATCHB_FDCRESET);
  65. }
  66. return 0;
  67. }
  69. __initcall(oldlatch_init);
  71. EXPORT_SYMBOL(oldlatch_aupdate);
  72. EXPORT_SYMBOL(oldlatch_bupdate);