include/hw/pci/pci_bridge.h

   1 /*
   2  * QEMU PCI bridge
   3  *
   4  * Copyright (c) 2004 Fabrice Bellard
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  19  *
  20  * split out pci bus specific stuff from pci.[hc] to pci_bridge.[hc]
  21  * Copyright (c) 2009 Isaku Yamahata <yamahata at valinux co jp>
  22  *                    VA Linux Systems Japan K.K.
  23  *
  24  */
  25
  26 #ifndef QEMU_PCI_BRIDGE_H
  27 #define QEMU_PCI_BRIDGE_H
  28
  29 #include "hw/pci/pci.h"
  30 #include "hw/pci/pci_bus.h"
  31
  32 typedef struct PCIBridgeWindows PCIBridgeWindows;
  33
  34 /*
  35  * Aliases for each of the address space windows that the bridge
  36  * can forward. Mapped into the bridge's parent's address space,
  37  * as subregions.
  38  */
  39 struct PCIBridgeWindows {
  40     MemoryRegion alias_pref_mem;
  41     MemoryRegion alias_mem;
  42     MemoryRegion alias_io;
  43     /*
  44      * When bridge control VGA forwarding is enabled, bridges will
  45      * provide positive decode on the PCI VGA defined I/O port and
  46      * MMIO ranges.  When enabled forwarding is only qualified on the
  47      * I/O and memory enable bits in the bridge command register.
  48      */
  49     MemoryRegion alias_vga[QEMU_PCI_VGA_NUM_REGIONS];
  50 };
  51
  52 #define TYPE_PCI_BRIDGE "base-pci-bridge"
  53 #define PCI_BRIDGE(obj) OBJECT_CHECK(PCIBridge, (obj), TYPE_PCI_BRIDGE)
  54
  55 struct PCIBridge {
  56     /*< private >*/
  57     PCIDevice parent_obj;
  58     /*< public >*/
  59
  60     /* private member */
  61     PCIBus sec_bus;
  62     /*
  63      * Memory regions for the bridge's address spaces.  These regions are not
  64      * directly added to system_memory/system_io or its descendants.
  65      * Bridge's secondary bus points to these, so that devices
  66      * under the bridge see these regions as its address spaces.
  67      * The regions are as large as the entire address space -
  68      * they don't take into account any windows.
  69      */
  70     MemoryRegion address_space_mem;
  71     MemoryRegion address_space_io;
  72
  73     PCIBridgeWindows *windows;
  74
  75     pci_map_irq_fn map_irq;
  76     const char *bus_name;
  77 };
  78
  79 #define PCI_BRIDGE_DEV_PROP_CHASSIS_NR "chassis_nr"
  80 #define PCI_BRIDGE_DEV_PROP_MSI        "msi"
  81 #define PCI_BRIDGE_DEV_PROP_SHPC       "shpc"
  82
  83 int pci_bridge_ssvid_init(PCIDevice *dev, uint8_t offset,
  84                           uint16_t svid, uint16_t ssid,
  85                           Error **errp);
  86
  87 PCIDevice *pci_bridge_get_device(PCIBus *bus);
  88 PCIBus *pci_bridge_get_sec_bus(PCIBridge *br);
  89
  90 pcibus_t pci_bridge_get_base(const PCIDevice *bridge, uint8_t type);
  91 pcibus_t pci_bridge_get_limit(const PCIDevice *bridge, uint8_t type);
  92
  93 void pci_bridge_update_mappings(PCIBridge *br);
  94 void pci_bridge_write_config(PCIDevice *d,
  95                              uint32_t address, uint32_t val, int len);
  96 void pci_bridge_disable_base_limit(PCIDevice *dev);
  97 void pci_bridge_reset(DeviceState *qdev);
  98
  99 void pci_bridge_initfn(PCIDevice *pci_dev, const char *typename);
 100 void pci_bridge_exitfn(PCIDevice *pci_dev);
 101
 102
 103 /*
 104  * before qdev initialization(qdev_init()), this function sets bus_name and
 105  * map_irq callback which are necessry for pci_bridge_initfn() to
 106  * initialize bus.
 107  */
 108 void pci_bridge_map_irq(PCIBridge *br, const char* bus_name,
 109                         pci_map_irq_fn map_irq);
 110
 111 /* TODO: add this define to pci_regs.h in linux and then in qemu. */
 112 #define  PCI_BRIDGE_CTL_VGA_16BIT       0x10    /* VGA 16-bit decode */
 113 #define  PCI_BRIDGE_CTL_DISCARD         0x100   /* Primary discard timer */
 114 #define  PCI_BRIDGE_CTL_SEC_DISCARD     0x200   /* Secondary discard timer */
 115 #define  PCI_BRIDGE_CTL_DISCARD_STATUS  0x400   /* Discard timer status */
 116 #define  PCI_BRIDGE_CTL_DISCARD_SERR    0x800   /* Discard timer SERR# enable */
 117
 118 typedef struct PCIBridgeQemuCap {
 119     uint8_t id;     /* Standard PCI capability header field */
 120     uint8_t next;   /* Standard PCI capability header field */
 121     uint8_t len;    /* Standard PCI vendor-specific capability header field */
 122     uint8_t type;   /* Red Hat vendor-specific capability type.
 123                        Types are defined with REDHAT_PCI_CAP_ prefix */
 124
 125     uint32_t bus_res;   /* Minimum number of buses to reserve */
 126     uint64_t io;        /* IO space to reserve */
 127     uint32_t mem;       /* Non-prefetchable memory to reserve */
 128     /* At most one of the following two fields may be set to a value
 129      * different from -1 */
 130     uint32_t mem_pref_32; /* Prefetchable memory to reserve (32-bit MMIO) */
 131     uint64_t mem_pref_64; /* Prefetchable memory to reserve (64-bit MMIO) */
 132 } PCIBridgeQemuCap;
 133
 134 #define REDHAT_PCI_CAP_RESOURCE_RESERVE 1
 135
 136 /*
 137  * PCI BUS/IO/MEM/PREFMEM additional resources recorded as a
 138  * capability in PCI configuration space to reserve on firmware init.
 139  */
 140 typedef struct PCIResReserve {
 141     uint32_t bus;
 142     uint64_t io;
 143     uint64_t mem_non_pref;
 144     uint64_t mem_pref_32;
 145     uint64_t mem_pref_64;
 146 } PCIResReserve;
 147
 148 int pci_bridge_qemu_reserve_cap_init(PCIDevice *dev, int cap_offset,
 149                                PCIResReserve res_reserve, Error **errp);
 150
 151 #endif /* QEMU_PCI_BRIDGE_H */