misc.c 2.1 KB

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  1. // SPDX-License-Identifier: GPL-2.0+
  2. /*
  3. * Copyright 2013 Stefan Roese <sr@denx.de>
  4. */
  5. #include <common.h>
  6. #include <lmb.h>
  7. #include <log.h>
  8. #include <asm/arch/sys_proto.h>
  9. #include <linux/errno.h>
  10. #include <asm/io.h>
  11. #include <asm/mach-imx/regs-common.h>
  12. DECLARE_GLOBAL_DATA_PTR;
  13. /* 1 second delay should be plenty of time for block reset. */
  14. #define RESET_MAX_TIMEOUT 1000000
  15. #define MXS_BLOCK_SFTRST (1 << 31)
  16. #define MXS_BLOCK_CLKGATE (1 << 30)
  17. int mxs_wait_mask_set(struct mxs_register_32 *reg, uint32_t mask, unsigned
  18. int timeout)
  19. {
  20. while (--timeout) {
  21. if ((readl(&reg->reg) & mask) == mask)
  22. break;
  23. udelay(1);
  24. }
  25. return !timeout;
  26. }
  27. int mxs_wait_mask_clr(struct mxs_register_32 *reg, uint32_t mask, unsigned
  28. int timeout)
  29. {
  30. while (--timeout) {
  31. if ((readl(&reg->reg) & mask) == 0)
  32. break;
  33. udelay(1);
  34. }
  35. return !timeout;
  36. }
  37. int mxs_reset_block(struct mxs_register_32 *reg)
  38. {
  39. /* Clear SFTRST */
  40. writel(MXS_BLOCK_SFTRST, &reg->reg_clr);
  41. if (mxs_wait_mask_clr(reg, MXS_BLOCK_SFTRST, RESET_MAX_TIMEOUT))
  42. return 1;
  43. /* Clear CLKGATE */
  44. writel(MXS_BLOCK_CLKGATE, &reg->reg_clr);
  45. /* Set SFTRST */
  46. writel(MXS_BLOCK_SFTRST, &reg->reg_set);
  47. /* Wait for CLKGATE being set */
  48. if (mxs_wait_mask_set(reg, MXS_BLOCK_CLKGATE, RESET_MAX_TIMEOUT))
  49. return 1;
  50. /* Clear SFTRST */
  51. writel(MXS_BLOCK_SFTRST, &reg->reg_clr);
  52. if (mxs_wait_mask_clr(reg, MXS_BLOCK_SFTRST, RESET_MAX_TIMEOUT))
  53. return 1;
  54. /* Clear CLKGATE */
  55. writel(MXS_BLOCK_CLKGATE, &reg->reg_clr);
  56. if (mxs_wait_mask_clr(reg, MXS_BLOCK_CLKGATE, RESET_MAX_TIMEOUT))
  57. return 1;
  58. return 0;
  59. }
  60. static ulong get_sp(void)
  61. {
  62. ulong ret;
  63. asm("mov %0, sp" : "=r"(ret) : );
  64. return ret;
  65. }
  66. void board_lmb_reserve(struct lmb *lmb)
  67. {
  68. ulong sp, bank_end;
  69. int bank;
  70. sp = get_sp();
  71. debug("## Current stack ends at 0x%08lx ", sp);
  72. /* adjust sp by 16K to be safe */
  73. sp -= 4096 << 2;
  74. for (bank = 0; bank < CONFIG_NR_DRAM_BANKS; bank++) {
  75. if (sp < gd->bd->bi_dram[bank].start)
  76. continue;
  77. bank_end = gd->bd->bi_dram[bank].start +
  78. gd->bd->bi_dram[bank].size;
  79. if (sp >= bank_end)
  80. continue;
  81. lmb_reserve(lmb, sp, bank_end - sp);
  82. break;
  83. }
  84. }