io.c 1.7 KB

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  1. // SPDX-License-Identifier: GPL-2.0+
  2. #include <linux/kernel.h>
  3. #include <linux/init.h>
  4. #include <linux/module.h>
  5. #include <linux/types.h>
  6. #include <linux/device.h>
  7. #include <linux/string.h>
  8. #include <linux/slab.h>
  9. #include <linux/fs.h>
  10. #include <linux/platform_device.h>
  11. #include <linux/of.h>
  12. #include <linux/of_address.h>
  13. #include <linux/firmware.h>
  14. #include <linux/io.h>
  15. #include "io.h"
  16. static inline void byte0_out(unsigned char data);
  17. static inline void byte1_out(unsigned char data);
  18. static inline void xl_cclk_b(int32_t i);
  19. /* Assert and Deassert CCLK */
  20. void xl_shift_cclk(int count)
  21. {
  22. int i;
  23. for (i = 0; i < count; i++) {
  24. xl_cclk_b(1);
  25. xl_cclk_b(0);
  26. }
  27. }
  28. int xl_supported_prog_bus_width(enum wbus bus_bytes)
  29. {
  30. switch (bus_bytes) {
  31. case bus_1byte:
  32. break;
  33. case bus_2byte:
  34. break;
  35. default:
  36. pr_err("unsupported program bus width %d\n", bus_bytes);
  37. return 0;
  38. }
  39. return 1;
  40. }
  41. /* Serialize byte and clock each bit on target's DIN and CCLK pins */
  42. void xl_shift_bytes_out(enum wbus bus_byte, unsigned char *pdata)
  43. {
  44. /*
  45. * supports 1 and 2 bytes programming mode
  46. */
  47. if (likely(bus_byte == bus_2byte))
  48. byte0_out(pdata[0]);
  49. byte1_out(pdata[1]);
  50. xl_shift_cclk(1);
  51. }
  52. /*
  53. * generic bit swap for xilinx SYSTEMMAP FPGA programming
  54. */
  55. void xl_program_b(int32_t i)
  56. {
  57. }
  58. void xl_rdwr_b(int32_t i)
  59. {
  60. }
  61. void xl_csi_b(int32_t i)
  62. {
  63. }
  64. int xl_get_init_b(void)
  65. {
  66. return -1;
  67. }
  68. int xl_get_done_b(void)
  69. {
  70. return -1;
  71. }
  72. static inline void byte0_out(unsigned char data)
  73. {
  74. }
  75. static inline void byte1_out(unsigned char data)
  76. {
  77. }
  78. static inline void xl_cclk_b(int32_t i)
  79. {
  80. }
  81. /*
  82. * configurable per device type for different I/O config
  83. */
  84. int xl_init_io(void)
  85. {
  86. return -1;
  87. }