1 // SPDX-License-Identifier: GPL-2.0-or-later
25 #include <asm/io.h>
26 #include <asm/pci-bridge.h>
29 #include <asm/ppc-pci.h>
31 /* pci_io_base -- the base address from which io bars are offsets.
35  * is mapped on the first 64K of IO space
51 	/* On ppc64, we always enable PCI domains and we keep domain 0  in pcibios_init()
65 		pci_bus_add_devices(hose->bus);  in pcibios_init()
86 	 * mappings since we might have to deal with sub-page alignments  in pcibios_unmap_io_space()
94 	if (bus->self) {  in pcibios_unmap_io_space()
96 		struct resource *res = bus->resource[0];  in pcibios_unmap_io_space()
99 		pr_debug("IO unmapping for PCI-PCI bridge %s\n",  in pcibios_unmap_io_space()
100 			 pci_name(bus->self));  in pcibios_unmap_io_space()
103 		__flush_hash_table_range(res->start + _IO_BASE,  in pcibios_unmap_io_space()
104 					 res->end + _IO_BASE + 1);  in pcibios_unmap_io_space()
112 	pr_debug("IO unmapping for PHB %pOF\n", hose->dn);  in pcibios_unmap_io_space()
113 	pr_debug("  alloc=0x%p\n", hose->io_base_alloc);  in pcibios_unmap_io_space()
115 	iounmap(hose->io_base_alloc);  in pcibios_unmap_io_space()
129 	 * Let's allocate some IO space for that guy. We don't pass VM_IOREMAP  in ioremap_phb()
140 	addr = (unsigned long)area->addr;  in ioremap_phb()
157 	phys_page = ALIGN_DOWN(hose->io_base_phys, PAGE_SIZE);  in pcibios_map_phb_io_space()
158 	size_page = ALIGN(hose->pci_io_size, PAGE_SIZE);  in pcibios_map_phb_io_space()
160 	/* Make sure IO area address is clear */  in pcibios_map_phb_io_space()
161 	hose->io_base_alloc = NULL;  in pcibios_map_phb_io_space()
163 	/* If there's no IO to map on that bus, get away too */  in pcibios_map_phb_io_space()
164 	if (hose->pci_io_size == 0 || hose->io_base_phys == 0)  in pcibios_map_phb_io_space()
167 	/* Let's allocate some IO space for that guy. We don't pass  in pcibios_map_phb_io_space()
173 	hose->io_base_alloc = ioremap_phb(phys_page, size_page);  in pcibios_map_phb_io_space()
174 	if (!hose->io_base_alloc)  in pcibios_map_phb_io_space()
175 		return -ENOMEM;  in pcibios_map_phb_io_space()
176 	hose->io_base_virt = hose->io_base_alloc +  in pcibios_map_phb_io_space()
177 				hose->io_base_phys - phys_page;  in pcibios_map_phb_io_space()
179 	pr_debug("IO mapping for PHB %pOF\n", hose->dn);  in pcibios_map_phb_io_space()
181 		 hose->io_base_phys, hose->io_base_virt, hose->io_base_alloc);  in pcibios_map_phb_io_space()
183 		 hose->pci_io_size, size_page);  in pcibios_map_phb_io_space()
185 	/* Fixup hose IO resource */  in pcibios_map_phb_io_space()
187 	hose->io_resource.start += io_virt_offset;  in pcibios_map_phb_io_space()
188 	hose->io_resource.end += io_virt_offset;  in pcibios_map_phb_io_space()
190 	pr_debug("  hose->io_resource=%pR\n", &hose->io_resource);  in pcibios_map_phb_io_space()
202 	if (bus->self) {  in pcibios_map_io_space()
203 		pr_debug("IO mapping for PCI-PCI bridge %s\n",  in pcibios_map_io_space()
204 			 pci_name(bus->self));  in pcibios_map_io_space()
206 			 bus->resource[0]->start + _IO_BASE,  in pcibios_map_io_space()
207 			 bus->resource[0]->end + _IO_BASE);  in pcibios_map_io_space()
235 	 * G5 machines... So when something asks for bus 0 io base  in SYSCALL_DEFINE3()
241 		agp = of_find_compatible_node(NULL, NULL, "u3-agp");  in SYSCALL_DEFINE3()
247 	/* That syscall isn't quite compatible with PCI domains, but it's  in SYSCALL_DEFINE3()
248 	 * used on pre-domains setup. We return the first match  in SYSCALL_DEFINE3()
252 		if (in_bus >= tmp_bus->number &&  in SYSCALL_DEFINE3()
253 		    in_bus <= tmp_bus->busn_res.end) {  in SYSCALL_DEFINE3()
258 	if (bus == NULL || bus->dev.of_node == NULL)  in SYSCALL_DEFINE3()
259 		return -ENODEV;  in SYSCALL_DEFINE3()
261 	hose_node = bus->dev.of_node;  in SYSCALL_DEFINE3()
262 	hose = PCI_DN(hose_node)->phb;  in SYSCALL_DEFINE3()
266 		return (long)hose->first_busno;  in SYSCALL_DEFINE3()
268 		return (long)hose->mem_offset[0];  in SYSCALL_DEFINE3()
270 		return (long)hose->io_base_phys;  in SYSCALL_DEFINE3()
274 		return -EINVAL;  in SYSCALL_DEFINE3()
277 	return -EOPNOTSUPP;  in SYSCALL_DEFINE3()
284 	return phb->node;  in pcibus_to_node()
293 		return -ENODEV;  in pci_device_from_OF_node()
294 	*bus = PCI_DN(np)->busno;  in pci_device_from_OF_node()
295 	*devfn = PCI_DN(np)->devfn;  in pci_device_from_OF_node()