1 /* 2 * pcie_host.c 3 * utility functions for pci express host bridge. 4 * 5 * Copyright (c) 2009 Isaku Yamahata <yamahata at valinux co jp> 6 * VA Linux Systems Japan K.K. 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 18 * You should have received a copy of the GNU General Public License along 19 * with this program; if not, see <http://www.gnu.org/licenses/>. 20 */ 21 22 #include "qemu/osdep.h" 23 #include "hw/hw.h" 24 #include "hw/pci/pci.h" 25 #include "hw/pci/pcie_host.h" 26 #include "exec/address-spaces.h" 27 28 /* a helper function to get a PCIDevice for a given mmconfig address */ 29 static inline PCIDevice *pcie_dev_find_by_mmcfg_addr(PCIBus *s, 30 uint32_t mmcfg_addr) 31 { 32 return pci_find_device(s, PCIE_MMCFG_BUS(mmcfg_addr), 33 PCIE_MMCFG_DEVFN(mmcfg_addr)); 34 } 35 36 static void pcie_mmcfg_data_write(void *opaque, hwaddr mmcfg_addr, 37 uint64_t val, unsigned len) 38 { 39 PCIExpressHost *e = opaque; 40 PCIBus *s = e->pci.bus; 41 PCIDevice *pci_dev = pcie_dev_find_by_mmcfg_addr(s, mmcfg_addr); 42 uint32_t addr; 43 uint32_t limit; 44 45 if (!pci_dev) { 46 return; 47 } 48 addr = PCIE_MMCFG_CONFOFFSET(mmcfg_addr); 49 limit = pci_config_size(pci_dev); 50 pci_host_config_write_common(pci_dev, addr, limit, val, len); 51 } 52 53 static uint64_t pcie_mmcfg_data_read(void *opaque, 54 hwaddr mmcfg_addr, 55 unsigned len) 56 { 57 PCIExpressHost *e = opaque; 58 PCIBus *s = e->pci.bus; 59 PCIDevice *pci_dev = pcie_dev_find_by_mmcfg_addr(s, mmcfg_addr); 60 uint32_t addr; 61 uint32_t limit; 62 63 if (!pci_dev) { 64 return ~0x0; 65 } 66 addr = PCIE_MMCFG_CONFOFFSET(mmcfg_addr); 67 limit = pci_config_size(pci_dev); 68 return pci_host_config_read_common(pci_dev, addr, limit, len); 69 } 70 71 static const MemoryRegionOps pcie_mmcfg_ops = { 72 .read = pcie_mmcfg_data_read, 73 .write = pcie_mmcfg_data_write, 74 .endianness = DEVICE_LITTLE_ENDIAN, 75 }; 76 77 static void pcie_host_init(Object *obj) 78 { 79 PCIExpressHost *e = PCIE_HOST_BRIDGE(obj); 80 81 e->base_addr = PCIE_BASE_ADDR_UNMAPPED; 82 memory_region_init_io(&e->mmio, OBJECT(e), &pcie_mmcfg_ops, e, "pcie-mmcfg-mmio", 83 PCIE_MMCFG_SIZE_MAX); 84 } 85 86 void pcie_host_mmcfg_unmap(PCIExpressHost *e) 87 { 88 if (e->base_addr != PCIE_BASE_ADDR_UNMAPPED) { 89 memory_region_del_subregion(get_system_memory(), &e->mmio); 90 e->base_addr = PCIE_BASE_ADDR_UNMAPPED; 91 } 92 } 93 94 void pcie_host_mmcfg_init(PCIExpressHost *e, uint32_t size) 95 { 96 assert(!(size & (size - 1))); /* power of 2 */ 97 assert(size >= PCIE_MMCFG_SIZE_MIN); 98 assert(size <= PCIE_MMCFG_SIZE_MAX); 99 e->size = size; 100 memory_region_set_size(&e->mmio, e->size); 101 } 102 103 void pcie_host_mmcfg_map(PCIExpressHost *e, hwaddr addr, 104 uint32_t size) 105 { 106 pcie_host_mmcfg_init(e, size); 107 e->base_addr = addr; 108 memory_region_add_subregion(get_system_memory(), e->base_addr, &e->mmio); 109 } 110 111 void pcie_host_mmcfg_update(PCIExpressHost *e, 112 int enable, 113 hwaddr addr, 114 uint32_t size) 115 { 116 memory_region_transaction_begin(); 117 pcie_host_mmcfg_unmap(e); 118 if (enable) { 119 pcie_host_mmcfg_map(e, addr, size); 120 } 121 memory_region_transaction_commit(); 122 } 123 124 static const TypeInfo pcie_host_type_info = { 125 .name = TYPE_PCIE_HOST_BRIDGE, 126 .parent = TYPE_PCI_HOST_BRIDGE, 127 .abstract = true, 128 .instance_size = sizeof(PCIExpressHost), 129 .instance_init = pcie_host_init, 130 }; 131 132 static void pcie_host_register_types(void) 133 { 134 type_register_static(&pcie_host_type_info); 135 } 136 137 type_init(pcie_host_register_types) 138