linux-user: rename gettid() to sys_gettid() to avoid clash with glibc
[qemu/ar7.git] / hw / pci / pcie_host.c
blob553db56778b66521e238215a9de9e84c136f1302
1 /*
2 * pcie_host.c
3 * utility functions for pci express host bridge.
5 * Copyright (c) 2009 Isaku Yamahata <yamahata at valinux co jp>
6 * VA Linux Systems Japan K.K.
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.
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.
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/>.
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"
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)
32 return pci_find_device(s, PCIE_MMCFG_BUS(mmcfg_addr),
33 PCIE_MMCFG_DEVFN(mmcfg_addr));
36 static void pcie_mmcfg_data_write(void *opaque, hwaddr mmcfg_addr,
37 uint64_t val, unsigned len)
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;
45 if (!pci_dev) {
46 return;
48 addr = PCIE_MMCFG_CONFOFFSET(mmcfg_addr);
49 limit = pci_config_size(pci_dev);
50 if (limit <= addr) {
51 /* conventional pci device can be behind pcie-to-pci bridge.
52 256 <= addr < 4K has no effects. */
53 return;
55 pci_host_config_write_common(pci_dev, addr, limit, val, len);
58 static uint64_t pcie_mmcfg_data_read(void *opaque,
59 hwaddr mmcfg_addr,
60 unsigned len)
62 PCIExpressHost *e = opaque;
63 PCIBus *s = e->pci.bus;
64 PCIDevice *pci_dev = pcie_dev_find_by_mmcfg_addr(s, mmcfg_addr);
65 uint32_t addr;
66 uint32_t limit;
68 if (!pci_dev) {
69 return ~0x0;
71 addr = PCIE_MMCFG_CONFOFFSET(mmcfg_addr);
72 limit = pci_config_size(pci_dev);
73 if (limit <= addr) {
74 /* conventional pci device can be behind pcie-to-pci bridge.
75 256 <= addr < 4K has no effects. */
76 return ~0x0;
78 return pci_host_config_read_common(pci_dev, addr, limit, len);
81 static const MemoryRegionOps pcie_mmcfg_ops = {
82 .read = pcie_mmcfg_data_read,
83 .write = pcie_mmcfg_data_write,
84 .endianness = DEVICE_LITTLE_ENDIAN,
87 static void pcie_host_init(Object *obj)
89 PCIExpressHost *e = PCIE_HOST_BRIDGE(obj);
91 e->base_addr = PCIE_BASE_ADDR_UNMAPPED;
92 memory_region_init_io(&e->mmio, OBJECT(e), &pcie_mmcfg_ops, e, "pcie-mmcfg-mmio",
93 PCIE_MMCFG_SIZE_MAX);
96 void pcie_host_mmcfg_unmap(PCIExpressHost *e)
98 if (e->base_addr != PCIE_BASE_ADDR_UNMAPPED) {
99 memory_region_del_subregion(get_system_memory(), &e->mmio);
100 e->base_addr = PCIE_BASE_ADDR_UNMAPPED;
104 void pcie_host_mmcfg_init(PCIExpressHost *e, uint32_t size)
106 assert(!(size & (size - 1))); /* power of 2 */
107 assert(size >= PCIE_MMCFG_SIZE_MIN);
108 assert(size <= PCIE_MMCFG_SIZE_MAX);
109 e->size = size;
110 memory_region_set_size(&e->mmio, e->size);
113 void pcie_host_mmcfg_map(PCIExpressHost *e, hwaddr addr,
114 uint32_t size)
116 pcie_host_mmcfg_init(e, size);
117 e->base_addr = addr;
118 memory_region_add_subregion(get_system_memory(), e->base_addr, &e->mmio);
121 void pcie_host_mmcfg_update(PCIExpressHost *e,
122 int enable,
123 hwaddr addr,
124 uint32_t size)
126 memory_region_transaction_begin();
127 pcie_host_mmcfg_unmap(e);
128 if (enable) {
129 pcie_host_mmcfg_map(e, addr, size);
131 memory_region_transaction_commit();
134 static const TypeInfo pcie_host_type_info = {
135 .name = TYPE_PCIE_HOST_BRIDGE,
136 .parent = TYPE_PCI_HOST_BRIDGE,
137 .abstract = true,
138 .instance_size = sizeof(PCIExpressHost),
139 .instance_init = pcie_host_init,
142 static void pcie_host_register_types(void)
144 type_register_static(&pcie_host_type_info);
147 type_init(pcie_host_register_types)