1 // SPDX-License-Identifier: GPL-2.0-only
17 #include <asm/pci-bridge.h>
20  * get_int_prop - Decode a u32 from a device tree property
34  * pci_parse_of_flags - Parse the flags cell of a device tree PCI address
38  * PCI Bus Binding to IEEE Std 1275-1994
49  * t        is 1 if the address is aliased (for non-relocatable I/O),
54  *              10 denotes 32-bit-address Memory Space
55  *              11 denotes 64-bit-address Memory Space
56  * bbbbbbbb is the 8-bit Bus Number
57  * ddddd    is the 5-bit Device Number
58  * fff      is the 3-bit Function Number
59  * rrrrrrrr is the 8-bit Register Number
95 		 * do a config space read, it will be force-enabled if needed  in pci_parse_of_flags()
110  * of_pci_parse_addrs - Parse PCI addresses assigned in the device tree node
114  * This function parses the 'assigned-addresses' property of a PCI devices'
128 	addrs = of_get_property(node, "assigned-addresses", &proplen);  in of_pci_parse_addrs()
137 	for (; proplen >= 20; proplen -= 20, addrs += 5) {  in of_pci_parse_addrs()
151 			res = &dev->resource[(i - PCI_BASE_ADDRESS_0) >> 2];  in of_pci_parse_addrs()
152 		} else if (i == dev->rom_base_reg) {  in of_pci_parse_addrs()
153 			res = &dev->resource[PCI_ROM_RESOURCE];  in of_pci_parse_addrs()
159 		res->flags = flags;  in of_pci_parse_addrs()
161 			res->flags |= IORESOURCE_UNSET;  in of_pci_parse_addrs()
162 		res->name = pci_name(dev);  in of_pci_parse_addrs()
164 		region.end = base + size - 1;  in of_pci_parse_addrs()
165 		pcibios_bus_to_resource(dev->bus, res, &region);  in of_pci_parse_addrs()
170  * of_create_pci_dev - Given a device tree node on a pci bus, create a pci_dev
187 	dev->dev.of_node = of_node_get(node);  in of_create_pci_dev()
188 	dev->dev.parent = bus->bridge;  in of_create_pci_dev()
189 	dev->dev.bus = &pci_bus_type;  in of_create_pci_dev()
190 	dev->devfn = devfn;  in of_create_pci_dev()
191 	dev->multifunction = 0;		/* maybe a lie? */  in of_create_pci_dev()
192 	dev->needs_freset = 0;		/* pcie fundamental reset required */  in of_create_pci_dev()
196 	dev->vendor = get_int_prop(node, "vendor-id", 0xffff);  in of_create_pci_dev()
197 	dev->device = get_int_prop(node, "device-id", 0xffff);  in of_create_pci_dev()
198 	dev->subsystem_vendor = get_int_prop(node, "subsystem-vendor-id", 0);  in of_create_pci_dev()
199 	dev->subsystem_device = get_int_prop(node, "subsystem-id", 0);  in of_create_pci_dev()
201 	dev->cfg_size = pci_cfg_space_size(dev);  in of_create_pci_dev()
203 	dev_set_name(&dev->dev, "%04x:%02x:%02x.%d", pci_domain_nr(bus),  in of_create_pci_dev()
204 		dev->bus->number, PCI_SLOT(devfn), PCI_FUNC(devfn));  in of_create_pci_dev()
205 	dev->class = get_int_prop(node, "class-code", 0);  in of_create_pci_dev()
206 	dev->revision = get_int_prop(node, "revision-id", 0);  in of_create_pci_dev()
208 	pr_debug("    class: 0x%x\n", dev->class);  in of_create_pci_dev()
209 	pr_debug("    revision: 0x%x\n", dev->revision);  in of_create_pci_dev()
211 	dev->current_state = PCI_UNKNOWN;	/* unknown power state */  in of_create_pci_dev()
212 	dev->error_state = pci_channel_io_normal;  in of_create_pci_dev()
213 	dev->dma_mask = 0xffffffff;  in of_create_pci_dev()
219 		/* a PCI-PCI bridge */  in of_create_pci_dev()
220 		dev->hdr_type = PCI_HEADER_TYPE_BRIDGE;  in of_create_pci_dev()
221 		dev->rom_base_reg = PCI_ROM_ADDRESS1;  in of_create_pci_dev()
224 		dev->hdr_type = PCI_HEADER_TYPE_CARDBUS;  in of_create_pci_dev()
226 		dev->hdr_type = PCI_HEADER_TYPE_NORMAL;  in of_create_pci_dev()
227 		dev->rom_base_reg = PCI_ROM_ADDRESS;  in of_create_pci_dev()
229 		dev->irq = 0;  in of_create_pci_dev()
243  * of_scan_pci_bridge - Set up a PCI bridge and scan for child nodes
252 	struct device_node *node = dev->dev.of_node;  in of_scan_pci_bridge()
264 	/* parse bus-range property */  in of_scan_pci_bridge()
265 	busrange = of_get_property(node, "bus-range", &len);  in of_scan_pci_bridge()
267 		printk(KERN_DEBUG "Can't get bus-range for PCI-PCI bridge %pOF\n",  in of_scan_pci_bridge()
273 		printk(KERN_DEBUG "Can't get ranges for PCI-PCI bridge %pOF\n",  in of_scan_pci_bridge()
278 	bus = pci_find_bus(pci_domain_nr(dev->bus),  in of_scan_pci_bridge()
281 		bus = pci_add_new_bus(dev->bus, dev,  in of_scan_pci_bridge()
290 	bus->primary = dev->bus->number;  in of_scan_pci_bridge()
293 	bus->bridge_ctl = 0;  in of_scan_pci_bridge()
296 	/* PCI #address-cells == 3 and #size-cells == 2 always */  in of_scan_pci_bridge()
297 	res = &dev->resource[PCI_BRIDGE_RESOURCES];  in of_scan_pci_bridge()
298 	for (i = 0; i < PCI_NUM_RESOURCES - PCI_BRIDGE_RESOURCES; ++i) {  in of_scan_pci_bridge()
299 		res->flags = 0;  in of_scan_pci_bridge()
300 		bus->resource[i] = res;  in of_scan_pci_bridge()
304 	for (; len >= 32; len -= 32, ranges += 8) {  in of_scan_pci_bridge()
310 			res = bus->resource[0];  in of_scan_pci_bridge()
311 			if (res->flags) {  in of_scan_pci_bridge()
317 			if (i >= PCI_NUM_RESOURCES - PCI_BRIDGE_RESOURCES) {  in of_scan_pci_bridge()
322 			res = bus->resource[i];  in of_scan_pci_bridge()
325 		res->flags = flags;  in of_scan_pci_bridge()
327 		region.end = region.start + size - 1;  in of_scan_pci_bridge()
328 		pcibios_bus_to_resource(dev->bus, res, &region);  in of_scan_pci_bridge()
330 	sprintf(bus->name, "PCI Bus %04x:%02x", pci_domain_nr(bus),  in of_scan_pci_bridge()
331 		bus->number);  in of_scan_pci_bridge()
332 	pr_debug("    bus name: %s\n", bus->name);  in of_scan_pci_bridge()
337 	if (phb->controller_ops.probe_mode)  in of_scan_pci_bridge()
338 		mode = phb->controller_ops.probe_mode(bus);  in of_scan_pci_bridge()
376 	if (edev && (edev->mode & EEH_DEV_REMOVED))  in of_scan_pci_dev()
385 	pr_debug("  dev header type: %x\n", dev->hdr_type);  in of_scan_pci_dev()
390  * __of_scan_bus - given a PCI bus node, setup bus and scan for child devices
402 		 node, bus->number);  in __of_scan_bus()
409 		pr_debug("    dev header type: %x\n", dev->hdr_type);  in __of_scan_bus()
424  * of_scan_bus - given a PCI bus node, setup bus and scan for child devices
435  * of_rescan_bus - given a PCI bus node, scan for child devices