hw/acpi/ipmi.c

   1 /*
   2  * IPMI ACPI firmware handling
   3  *
   4  * Copyright (c) 2015,2016 Corey Minyard, MontaVista Software, LLC
   5  *
   6  * This work is licensed under the terms of the GNU GPL, version 2 or later.
   7  * See the COPYING file in the top-level directory.
   8  */
   9
  10 #include "qemu/osdep.h"
  11 #include "hw/ipmi/ipmi.h"
  12 #include "hw/acpi/aml-build.h"
  13 #include "hw/acpi/acpi.h"
  14 #include "hw/acpi/ipmi.h"
  15
  16 static Aml *aml_ipmi_crs(IPMIFwInfo *info, const char *resource)
  17 {
  18     Aml *crs = aml_resource_template();
  19
  20     /*
  21      * The base address is fixed and cannot change.  That may be different
  22      * if someone does PCI, but we aren't there yet.
  23      */
  24     switch (info->memspace) {
  25     case IPMI_MEMSPACE_IO:
  26         aml_append(crs, aml_io(AML_DECODE16, info->base_address,
  27                                info->base_address + info->register_length - 1,
  28                                info->register_spacing, info->register_length));
  29         break;
  30     case IPMI_MEMSPACE_MEM32:
  31         aml_append(crs,
  32                    aml_dword_memory(AML_POS_DECODE,
  33                             AML_MIN_FIXED, AML_MAX_FIXED,
  34                             AML_NON_CACHEABLE, AML_READ_WRITE,
  35                             0xffffffff,
  36                             info->base_address,
  37                             info->base_address + info->register_length - 1,
  38                             info->register_spacing, info->register_length));
  39         break;
  40     case IPMI_MEMSPACE_MEM64:
  41         aml_append(crs,
  42                    aml_qword_memory(AML_POS_DECODE,
  43                             AML_MIN_FIXED, AML_MAX_FIXED,
  44                             AML_NON_CACHEABLE, AML_READ_WRITE,
  45                             0xffffffffffffffffULL,
  46                             info->base_address,
  47                             info->base_address + info->register_length - 1,
  48                             info->register_spacing, info->register_length));
  49         break;
  50     case IPMI_MEMSPACE_SMBUS:
  51         aml_append(crs, aml_i2c_serial_bus_device(info->base_address,
  52                                                   resource));
  53         break;
  54     default:
  55         abort();
  56     }
  57
  58     if (info->interrupt_number) {
  59         aml_append(crs, aml_irq_no_flags(info->interrupt_number));
  60     }
  61
  62     return crs;
  63 }
  64
  65 static Aml *aml_ipmi_device(IPMIFwInfo *info, const char *resource)
  66 {
  67     Aml *dev;
  68     uint16_t version = ((info->ipmi_spec_major_revision << 8)
  69                         | (info->ipmi_spec_minor_revision << 4));
  70
  71     assert(info->ipmi_spec_minor_revision <= 15);
  72
  73     dev = aml_device("MI%d", info->uuid);
  74     aml_append(dev, aml_name_decl("_HID", aml_eisaid("IPI0001")));
  75     aml_append(dev, aml_name_decl("_STR", aml_string("ipmi_%s",
  76                                                      info->interface_name)));
  77     aml_append(dev, aml_name_decl("_UID", aml_int(info->uuid)));
  78     aml_append(dev, aml_name_decl("_CRS", aml_ipmi_crs(info, resource)));
  79     aml_append(dev, aml_name_decl("_IFT", aml_int(info->interface_type)));
  80     aml_append(dev, aml_name_decl("_SRV", aml_int(version)));
  81
  82     return dev;
  83 }
  84
  85 void build_acpi_ipmi_devices(Aml *scope, BusState *bus, const char *resource)
  86 {
  87
  88     BusChild *kid;
  89
  90     QTAILQ_FOREACH(kid, &bus->children,  sibling) {
  91         IPMIInterface *ii;
  92         IPMIInterfaceClass *iic;
  93         IPMIFwInfo info;
  94         Object *obj = object_dynamic_cast(OBJECT(kid->child),
  95                                           TYPE_IPMI_INTERFACE);
  96
  97         if (!obj) {
  98             continue;
  99         }
 100
 101         ii = IPMI_INTERFACE(obj);
 102         iic = IPMI_INTERFACE_GET_CLASS(obj);
 103         memset(&info, 0, sizeof(info));
 104         iic->get_fwinfo(ii, &info);
 105         aml_append(scope, aml_ipmi_device(&info, resource));
 106     }
 107 }