Halaman utama Jelajahi Bantuan
Masuk
8516
/
Test
1
0
Fork 0
Berkas Masalah 0 Permintaan Tarik 0 Wiki
Cabang: master
Ranting Tag
Test
/
board-support
/
u-boot-2017.01+gitAUTOINC+340fb36f04-g340fb36f04
/
arch
/
openrisc
/
include
/
asm
/
gpio.h

gpio.h 1.6 KB
Permalink Riwayat Mentahan

1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071 
  1. /*
    2. 

  2.  * OpenRISC gpio driver
    3. 

  3.  *
    4. 

  4.  * Copyright (C) 2011 Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
    5. 

  5.  *
    6. 

  6.  * based on nios2 gpio driver
    7. 

  7.  * Copyright (C) 2010 Thomas Chou <thomas@wytron.com.tw>
    8. 

  8.  *
    9. 

  9.  * when CONFIG_SYS_GPIO_BASE is not defined, board may provide
    10. 

  10.  * its own driver.
    11. 

  11.  *
    12. 

  12.  * SPDX-License-Identifier:	GPL-2.0+
    13. 

  13.  */
    14. 

  14. 

  15. #ifdef CONFIG_SYS_GPIO_BASE
    16. 

  16. #include <asm/io.h>
    17. 

  17. 

  18. static inline int gpio_request(unsigned gpio, const char *label)
    19. 

  19. {
    20. 

  20. 	return 0;
    21. 

  21. }
    22. 

  22. 

  23. static inline int gpio_free(unsigned gpio)
    24. 

  24. {
    25. 

  25. 	return 0;
    26. 

  26. }
    27. 

  27. 

  28. static inline int gpio_get_value(unsigned gpio)
    29. 

  29. {
    30. 

  30. 	return (readb(CONFIG_SYS_GPIO_BASE + gpio/8) >> gpio%8) & 0x1;
    31. 

  31. }
    32. 

  32. 

  33. static inline void gpio_set_value(unsigned gpio, int value)
    34. 

  34. {
    35. 

  35. 	u8 tmp = readb(CONFIG_SYS_GPIO_BASE + gpio/8);
    36. 

  36. 

  37. 	if (value)
    38. 

  38. 		tmp |= (1 << gpio%8);
    39. 

  39. 	else
    40. 

  40. 		tmp &= ~(1 << gpio%8);
    41. 

  41. 	writeb(tmp, CONFIG_SYS_GPIO_BASE + gpio/8);
    42. 

  42. }
    43. 

  43. 

  44. static inline int gpio_direction_input(unsigned gpio)
    45. 

  45. {
    46. 

  46. 	gpio_set_value(gpio + CONFIG_SYS_GPIO_WIDTH, 0);
    47. 

  47. 

  48. 	return 0;
    49. 

  49. }
    50. 

  50. 

  51. static inline int gpio_direction_output(unsigned gpio, int value)
    52. 

  52. {
    53. 

  53. 	gpio_set_value(gpio + CONFIG_SYS_GPIO_WIDTH, 1);
    54. 

  54. 	gpio_set_value(gpio, value);
    55. 

  55. 

  56. 	return 0;
    57. 

  57. }
    58. 

  58. 

  59. static inline int gpio_is_valid(int number)
    60. 

  60. {
    61. 

  61. 	return ((unsigned)number) < CONFIG_SYS_GPIO_WIDTH;
    62. 

  62. }
    63. 

  63. #else
    64. 

  64. extern int gpio_request(unsigned gpio, const char *label);
    65. 

  65. extern int gpio_free(unsigned gpio);
    66. 

  66. extern int gpio_direction_input(unsigned gpio);
    67. 

  67. extern int gpio_direction_output(unsigned gpio, int value);
    68. 

  68. extern int gpio_get_value(unsigned gpio);
    69. 

  69. extern void gpio_set_value(unsigned gpio, int value);
    70. 

  70. extern int gpio_is_valid(int number);
    71. 

  71. #endif /* CONFIG_SYS_GPIO_BASE */
    72.