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/delay.h>
  10. #include <linux/errno.h>
  11. #include <asm/io.h>
  12. #include <asm/mach-imx/regs-common.h>
  13. DECLARE_GLOBAL_DATA_PTR;
  14. /* 1 second delay should be plenty of time for block reset. */
  15. #define RESET_MAX_TIMEOUT 1000000
  16. #define MXS_BLOCK_SFTRST (1 << 31)
  17. #define MXS_BLOCK_CLKGATE (1 << 30)
  18. int mxs_wait_mask_set(struct mxs_register_32 *reg, uint32_t mask, unsigned
  19. int timeout)
  20. {
  21. while (--timeout) {
  22. if ((readl(&reg->reg) & mask) == mask)
  23. break;
  24. udelay(1);
  25. }
  26. return !timeout;
  27. }
  28. int mxs_wait_mask_clr(struct mxs_register_32 *reg, uint32_t mask, unsigned
  29. int timeout)
  30. {
  31. while (--timeout) {
  32. if ((readl(&reg->reg) & mask) == 0)
  33. break;
  34. udelay(1);
  35. }
  36. return !timeout;
  37. }
  38. int mxs_reset_block(struct mxs_register_32 *reg)
  39. {
  40. /* Clear SFTRST */
  41. writel(MXS_BLOCK_SFTRST, &reg->reg_clr);
  42. if (mxs_wait_mask_clr(reg, MXS_BLOCK_SFTRST, RESET_MAX_TIMEOUT))
  43. return 1;
  44. /* Clear CLKGATE */
  45. writel(MXS_BLOCK_CLKGATE, &reg->reg_clr);
  46. /* Set SFTRST */
  47. writel(MXS_BLOCK_SFTRST, &reg->reg_set);
  48. /* Wait for CLKGATE being set */
  49. if (mxs_wait_mask_set(reg, MXS_BLOCK_CLKGATE, RESET_MAX_TIMEOUT))
  50. return 1;
  51. /* Clear SFTRST */
  52. writel(MXS_BLOCK_SFTRST, &reg->reg_clr);
  53. if (mxs_wait_mask_clr(reg, MXS_BLOCK_SFTRST, RESET_MAX_TIMEOUT))
  54. return 1;
  55. /* Clear CLKGATE */
  56. writel(MXS_BLOCK_CLKGATE, &reg->reg_clr);
  57. if (mxs_wait_mask_clr(reg, MXS_BLOCK_CLKGATE, RESET_MAX_TIMEOUT))
  58. return 1;
  59. return 0;
  60. }
  61. static ulong get_sp(void)
  62. {
  63. ulong ret;
  64. asm("mov %0, sp" : "=r"(ret) : );
  65. return ret;
  66. }
  67. void board_lmb_reserve(struct lmb *lmb)
  68. {
  69. ulong sp, bank_end;
  70. int bank;
  71. sp = get_sp();
  72. debug("## Current stack ends at 0x%08lx ", sp);
  73. /* adjust sp by 16K to be safe */
  74. sp -= 4096 << 2;
  75. for (bank = 0; bank < CONFIG_NR_DRAM_BANKS; bank++) {
  76. if (sp < gd->bd->bi_dram[bank].start)
  77. continue;
  78. bank_end = gd->bd->bi_dram[bank].start +
  79. gd->bd->bi_dram[bank].size;
  80. if (sp >= bank_end)
  81. continue;
  82. lmb_reserve(lmb, sp, bank_end - sp);
  83. break;
  84. }
  85. }