src/acpi/sata.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <acpi/acpi.h>
   4 #include <acpi/acpigen.h>
   5 #include <acpi/acpi_sata.h>
   6
   7 /* e.g.
   8  * generate_sata_ssdt_ports("\_SB.PCI0.SATA", 0x3);
   9  * generates:
  10  * Scope (\_SB.PCI0.SATA)
  11  * {
  12  *     Device (PR00)
  13  *     {
  14  *         Name (_ADR, 0x0000FFFF)  // _ADR: Address
  15  *     }
  16  *
  17  *     Device (PR01)
  18  *     {
  19  *         Name (_ADR, 0x0001FFFF)  // _ADR: Address
  20  *     }
  21  * }
  22  *
  23  */
  24 void generate_sata_ssdt_ports(const char *scope, uint32_t enable_map)
  25 {
  26         int i;
  27         uint32_t bit;
  28         char port_name[4] = "PR00";
  29
  30         acpigen_write_scope(scope);
  31
  32         /* generate a device for every enabled port */
  33         for (i = 0; i < 32; i++) {
  34                 bit = 1 << i;
  35                 if (!(bit & enable_map))
  36                         continue;
  37
  38                 port_name[2] = '0' + i / 10;
  39                 port_name[3] = '0' + i % 10;
  40
  41                 acpigen_write_device(port_name);
  42
  43                 acpigen_write_name_dword("_ADR", 0xffff + i * 0x10000);
  44                 acpigen_pop_len(); /* close PRT%d */
  45         }
  46
  47         acpigen_pop_len(); /* close scope */
  48 }