lima_l2_cache.c 2.0 KB

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  1. // SPDX-License-Identifier: GPL-2.0 OR MIT
  2. /* Copyright 2017-2019 Qiang Yu <yuq825@gmail.com> */
  3. #include <linux/iopoll.h>
  4. #include <linux/device.h>
  5. #include "lima_device.h"
  6. #include "lima_l2_cache.h"
  7. #include "lima_regs.h"
  8. #define l2_cache_write(reg, data) writel(data, ip->iomem + reg)
  9. #define l2_cache_read(reg) readl(ip->iomem + reg)
  10. static int lima_l2_cache_wait_idle(struct lima_ip *ip)
  11. {
  12. struct lima_device *dev = ip->dev;
  13. int err;
  14. u32 v;
  15. err = readl_poll_timeout(ip->iomem + LIMA_L2_CACHE_STATUS, v,
  16. !(v & LIMA_L2_CACHE_STATUS_COMMAND_BUSY),
  17. 0, 1000);
  18. if (err) {
  19. dev_err(dev->dev, "l2 cache wait command timeout\n");
  20. return err;
  21. }
  22. return 0;
  23. }
  24. int lima_l2_cache_flush(struct lima_ip *ip)
  25. {
  26. int ret;
  27. spin_lock(&ip->data.lock);
  28. l2_cache_write(LIMA_L2_CACHE_COMMAND, LIMA_L2_CACHE_COMMAND_CLEAR_ALL);
  29. ret = lima_l2_cache_wait_idle(ip);
  30. spin_unlock(&ip->data.lock);
  31. return ret;
  32. }
  33. static int lima_l2_cache_hw_init(struct lima_ip *ip)
  34. {
  35. int err;
  36. err = lima_l2_cache_flush(ip);
  37. if (err)
  38. return err;
  39. l2_cache_write(LIMA_L2_CACHE_ENABLE,
  40. LIMA_L2_CACHE_ENABLE_ACCESS |
  41. LIMA_L2_CACHE_ENABLE_READ_ALLOCATE);
  42. l2_cache_write(LIMA_L2_CACHE_MAX_READS, 0x1c);
  43. return 0;
  44. }
  45. int lima_l2_cache_resume(struct lima_ip *ip)
  46. {
  47. return lima_l2_cache_hw_init(ip);
  48. }
  49. void lima_l2_cache_suspend(struct lima_ip *ip)
  50. {
  51. }
  52. int lima_l2_cache_init(struct lima_ip *ip)
  53. {
  54. int i;
  55. u32 size;
  56. struct lima_device *dev = ip->dev;
  57. /* l2_cache2 only exists when one of PP4-7 present */
  58. if (ip->id == lima_ip_l2_cache2) {
  59. for (i = lima_ip_pp4; i <= lima_ip_pp7; i++) {
  60. if (dev->ip[i].present)
  61. break;
  62. }
  63. if (i > lima_ip_pp7)
  64. return -ENODEV;
  65. }
  66. spin_lock_init(&ip->data.lock);
  67. size = l2_cache_read(LIMA_L2_CACHE_SIZE);
  68. dev_info(dev->dev, "l2 cache %uK, %u-way, %ubyte cache line, %ubit external bus\n",
  69. 1 << (((size >> 16) & 0xff) - 10),
  70. 1 << ((size >> 8) & 0xff),
  71. 1 << (size & 0xff),
  72. 1 << ((size >> 24) & 0xff));
  73. return lima_l2_cache_hw_init(ip);
  74. }
  75. void lima_l2_cache_fini(struct lima_ip *ip)
  76. {
  77. }