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