minix/lib/libacpi/acpi.c

   1 #define _SYSTEM
   2
   3 #include <errno.h>
   4 #include <string.h>
   5
   6 #include <minix/acpi.h>
   7 #include <minix/com.h>
   8 #include <minix/ds.h>
   9 #include <minix/ipc.h>
  10 #include <minix/log.h>
  11 #include <minix/sysutil.h>
  12
  13 static struct log log =
  14 { .name = "libacpi", .log_level = LEVEL_TRACE, .log_func = default_log };
  15
  16 static endpoint_t acpi_ep = NONE;
  17
  18 int
  19 acpi_init(void)
  20 {
  21         int res;
  22         res = ds_retrieve_label_endpt("acpi", &acpi_ep);
  23         return res;
  24 }
  25
  26 /*===========================================================================*
  27  *                              IRQ handling                                 *
  28  *===========================================================================*/
  29 int
  30 acpi_get_irq(unsigned bus, unsigned dev, unsigned pin)
  31 {
  32         int err;
  33         message m;
  34
  35         if (acpi_ep == NONE) {
  36                 err = acpi_init();
  37                 if (OK != err) {
  38                         panic("libacpi: ds_retrieve_label_endpt failed for 'acpi': %d", err);
  39                 }
  40                 else {
  41                         log_info(&log, "resolved acpi to endpoint: %d\n", acpi_ep);
  42                 }
  43         }
  44
  45         ((struct acpi_get_irq_req *)&m)->hdr.request = ACPI_REQ_GET_IRQ;
  46         ((struct acpi_get_irq_req *)&m)->bus = bus;
  47         ((struct acpi_get_irq_req *)&m)->dev = dev;
  48         ((struct acpi_get_irq_req *)&m)->pin = pin;
  49
  50         if ((err = ipc_sendrec(acpi_ep, &m)) != OK)
  51                 panic("libacpi: error %d while receiving from ACPI\n", err);
  52
  53         return ((struct acpi_get_irq_resp *)&m)->irq;
  54 }
  55
  56 /*
  57  * tells acpi which two busses are connected by this bridge. The primary bus
  58  * (pbnr) must be already known to acpi and it must map dev as the connection to
  59  * the secondary (sbnr) bus
  60  */
  61 void
  62 acpi_map_bridge(unsigned int pbnr, unsigned int dev, unsigned int sbnr)
  63 {
  64         int err;
  65         message m;
  66
  67         if (acpi_ep == NONE) {
  68                 err = acpi_init();
  69                 if (OK != err) {
  70                         panic("libacpi: ds_retrieve_label_endpt failed for 'acpi': %d", err);
  71                 }
  72         }
  73
  74         ((struct acpi_map_bridge_req *)&m)->hdr.request = ACPI_REQ_MAP_BRIDGE;
  75         ((struct acpi_map_bridge_req *)&m)->primary_bus = pbnr;
  76         ((struct acpi_map_bridge_req *)&m)->secondary_bus = sbnr;
  77         ((struct acpi_map_bridge_req *)&m)->device = dev;
  78
  79         if ((err = ipc_sendrec(acpi_ep, &m)) != OK)
  80                 panic("libacpi: error %d while receiving from ACPI\n", err);
  81
  82         if (((struct acpi_map_bridge_resp *)&m)->err != OK)
  83                 printf("libacpi: acpi failed to map pci (%d) to pci (%d) bridge\n",
  84                                                                 pbnr, sbnr);
  85 }