src/acpi/sata.c

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