src/acpi/fadt_filler.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <acpi/acpi.h>
   4 #include <console/console.h>
   5 #include <stdint.h>
   6
   7 static void fill_x_pm_io(acpi_addr_t *x_pm_blk, int access_size, uint16_t ioport, uint8_t len)
   8 {
   9         x_pm_blk->space_id = ACPI_ADDRESS_SPACE_IO;
  10         x_pm_blk->bit_width = len * 8;
  11         x_pm_blk->bit_offset = 0;
  12         x_pm_blk->access_size = access_size;
  13         x_pm_blk->addrl = ioport;
  14         x_pm_blk->addrh = 0x0;
  15 }
  16
  17 static void do_sanity_error(const char *func, const int line)
  18 {
  19         printk(BIOS_ERR, "ACPI: FADT error detected, %s line %d.\n", func, line);
  20 }
  21
  22 #define fadt_sanity(x)  do { if (!(x)) do_sanity_error(__func__, __LINE__); } while (0)
  23
  24 void fill_fadt_extended_pm_io(acpi_fadt_t *fadt)
  25 {
  26         fadt_sanity(fadt->pm1a_evt_blk && (fadt->pm1_evt_len >= 4));
  27
  28         /* Upper word is reserved and Linux complains about 32 bit. */
  29         fadt_sanity(fadt->pm1a_cnt_blk && (fadt->pm1_cnt_len == 2));
  30
  31         fill_x_pm_io(&fadt->x_pm1a_evt_blk, ACPI_ACCESS_SIZE_WORD_ACCESS,
  32                      fadt->pm1a_evt_blk, fadt->pm1_evt_len);
  33
  34         fill_x_pm_io(&fadt->x_pm1a_cnt_blk, ACPI_ACCESS_SIZE_WORD_ACCESS,
  35                      fadt->pm1a_cnt_blk, fadt->pm1_cnt_len);
  36
  37         if (fadt->pm1b_evt_blk)
  38                 fill_x_pm_io(&fadt->x_pm1b_evt_blk, ACPI_ACCESS_SIZE_WORD_ACCESS,
  39                              fadt->pm1b_evt_blk, fadt->pm1_evt_len);
  40
  41         if (fadt->pm1b_cnt_blk)
  42                 fill_x_pm_io(&fadt->x_pm1b_cnt_blk, ACPI_ACCESS_SIZE_WORD_ACCESS,
  43                              fadt->pm1b_cnt_blk, fadt->pm1_cnt_len);
  44
  45         if (fadt->pm_tmr_blk) {
  46                 fadt_sanity(fadt->pm_tmr_len == 4);
  47                 fill_x_pm_io(&fadt->x_pm_tmr_blk, ACPI_ACCESS_SIZE_DWORD_ACCESS,
  48                              fadt->pm_tmr_blk, fadt->pm_tmr_len);
  49         }
  50
  51         if (fadt->pm2_cnt_blk)
  52                 fill_x_pm_io(&fadt->x_pm2_cnt_blk, ACPI_ACCESS_SIZE_BYTE_ACCESS,
  53                              fadt->pm2_cnt_blk, fadt->pm2_cnt_len);
  54
  55         /*
  56          * Windows 10 requires x_gpe0_blk to be set starting with FADT revision 5.
  57          * The bit_width field intentionally overflows here.
  58          * The OSPM can instead use the values in `fadt->gpe0_blk{,_len}`, which
  59          * seems to work fine on Linux 5.0 and Windows 10.
  60          *
  61          * FIXME: GPE1_BASE is not initialised.
  62          *
  63          */
  64
  65         if (fadt->gpe0_blk)
  66                 fill_x_pm_io(&fadt->x_gpe0_blk, ACPI_ACCESS_SIZE_BYTE_ACCESS,
  67                              fadt->gpe0_blk, fadt->gpe0_blk_len);
  68
  69         if (fadt->gpe1_blk)
  70                 fill_x_pm_io(&fadt->x_gpe1_blk, ACPI_ACCESS_SIZE_BYTE_ACCESS,
  71                              fadt->gpe1_blk, fadt->gpe1_blk_len);
  72 }