cc_sram_mgr.c 2.4 KB

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  1. // SPDX-License-Identifier: GPL-2.0
  2. /* Copyright (C) 2012-2019 ARM Limited (or its affiliates). */
  3. #include "cc_driver.h"
  4. #include "cc_sram_mgr.h"
  5. /**
  6. * cc_sram_mgr_init() - Initializes SRAM pool.
  7. * The pool starts right at the beginning of SRAM.
  8. * Returns zero for success, negative value otherwise.
  9. *
  10. * @drvdata: Associated device driver context
  11. *
  12. * Return:
  13. * 0 for success, negative error code for failure.
  14. */
  15. int cc_sram_mgr_init(struct cc_drvdata *drvdata)
  16. {
  17. u32 start = 0;
  18. struct device *dev = drvdata_to_dev(drvdata);
  19. if (drvdata->hw_rev < CC_HW_REV_712) {
  20. /* Pool starts after ROM bytes */
  21. start = cc_ioread(drvdata, CC_REG(HOST_SEP_SRAM_THRESHOLD));
  22. if ((start & 0x3) != 0) {
  23. dev_err(dev, "Invalid SRAM offset 0x%x\n", start);
  24. return -EINVAL;
  25. }
  26. }
  27. drvdata->sram_free_offset = start;
  28. return 0;
  29. }
  30. /**
  31. * cc_sram_alloc() - Allocate buffer from SRAM pool.
  32. *
  33. * @drvdata: Associated device driver context
  34. * @size: The requested numer of bytes to allocate
  35. *
  36. * Return:
  37. * Address offset in SRAM or NULL_SRAM_ADDR for failure.
  38. */
  39. u32 cc_sram_alloc(struct cc_drvdata *drvdata, u32 size)
  40. {
  41. struct device *dev = drvdata_to_dev(drvdata);
  42. u32 p;
  43. if ((size & 0x3)) {
  44. dev_err(dev, "Requested buffer size (%u) is not multiple of 4",
  45. size);
  46. return NULL_SRAM_ADDR;
  47. }
  48. if (size > (CC_CC_SRAM_SIZE - drvdata->sram_free_offset)) {
  49. dev_err(dev, "Not enough space to allocate %u B (at offset %u)\n",
  50. size, drvdata->sram_free_offset);
  51. return NULL_SRAM_ADDR;
  52. }
  53. p = drvdata->sram_free_offset;
  54. drvdata->sram_free_offset += size;
  55. dev_dbg(dev, "Allocated %u B @ %u\n", size, p);
  56. return p;
  57. }
  58. /**
  59. * cc_set_sram_desc() - Create const descriptors sequence to
  60. * set values in given array into SRAM.
  61. * Note: each const value can't exceed word size.
  62. *
  63. * @src: A pointer to array of words to set as consts.
  64. * @dst: The target SRAM buffer to set into
  65. * @nelement: The number of words in "src" array
  66. * @seq: A pointer to the given IN/OUT descriptor sequence
  67. * @seq_len: A pointer to the given IN/OUT sequence length
  68. */
  69. void cc_set_sram_desc(const u32 *src, u32 dst, unsigned int nelement,
  70. struct cc_hw_desc *seq, unsigned int *seq_len)
  71. {
  72. u32 i;
  73. unsigned int idx = *seq_len;
  74. for (i = 0; i < nelement; i++, idx++) {
  75. hw_desc_init(&seq[idx]);
  76. set_din_const(&seq[idx], src[i], sizeof(u32));
  77. set_dout_sram(&seq[idx], dst + (i * sizeof(u32)), sizeof(u32));
  78. set_flow_mode(&seq[idx], BYPASS);
  79. }
  80. *seq_len = idx;
  81. }