io.h 2.4 KB

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  1. /*
  2. * Copyright 2006 PathScale, Inc. All Rights Reserved.
  3. *
  4. * This file is free software; you can redistribute it and/or modify
  5. * it under the terms of version 2 of the GNU General Public License
  6. * as published by the Free Software Foundation.
  7. *
  8. * This program is distributed in the hope that it will be useful,
  9. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  11. * GNU General Public License for more details.
  12. *
  13. * You should have received a copy of the GNU General Public License
  14. * along with this program; if not, write to the Free Software Foundation,
  15. * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
  16. */
  17. #ifndef _LINUX_IO_H
  18. #define _LINUX_IO_H
  19. #include <linux/types.h>
  20. #include <asm/io.h>
  21. #include <asm/page.h>
  22. struct device;
  23. void __iowrite32_copy(void __iomem *to, const void *from, size_t count);
  24. void __iowrite64_copy(void __iomem *to, const void *from, size_t count);
  25. int ioremap_page_range(unsigned long addr, unsigned long end,
  26. unsigned long phys_addr, pgprot_t prot);
  27. /*
  28. * Managed iomap interface
  29. */
  30. #ifdef CONFIG_HAS_IOPORT
  31. void __iomem * devm_ioport_map(struct device *dev, unsigned long port,
  32. unsigned int nr);
  33. void devm_ioport_unmap(struct device *dev, void __iomem *addr);
  34. #else
  35. static inline void __iomem *devm_ioport_map(struct device *dev,
  36. unsigned long port,
  37. unsigned int nr)
  38. {
  39. return NULL;
  40. }
  41. static inline void devm_ioport_unmap(struct device *dev, void __iomem *addr)
  42. {
  43. }
  44. #endif
  45. void __iomem * devm_ioremap(struct device *dev, unsigned long offset,
  46. unsigned long size);
  47. void __iomem * devm_ioremap_nocache(struct device *dev, unsigned long offset,
  48. unsigned long size);
  49. void devm_iounmap(struct device *dev, void __iomem *addr);
  50. /**
  51. * check_signature - find BIOS signatures
  52. * @io_addr: mmio address to check
  53. * @signature: signature block
  54. * @length: length of signature
  55. *
  56. * Perform a signature comparison with the mmio address io_addr. This
  57. * address should have been obtained by ioremap.
  58. * Returns 1 on a match.
  59. */
  60. static inline int check_signature(const volatile void __iomem *io_addr,
  61. const unsigned char *signature, int length)
  62. {
  63. int retval = 0;
  64. do {
  65. if (readb(io_addr) != *signature)
  66. goto out;
  67. io_addr++;
  68. signature++;
  69. length--;
  70. } while (length);
  71. retval = 1;
  72. out:
  73. return retval;
  74. }
  75. #endif /* _LINUX_IO_H */