1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
32  * Support APIs for Host to PCI bridge drivers and drivers that
33  * provide PCI domains.
42 #include <dev/pci/pcireg.h>
43 #include <dev/pci/pcivar.h>
44 #include <dev/pci/pcib_private.h>
47  * Try to read the bus number of a host-PCI bridge using appropriate config
75 		 * be seen first and isn't really a pci bridge (the  in host_pcib_get_busno()
80 		 * Since the MIOC doesn't have a pci bus attached, we  in host_pcib_get_busno()
105 		/* ServerWorks -- vendor 0x1166 */  in host_pcib_get_busno()
122 		/* Compaq/HP -- vendor 0x0e11 */  in host_pcib_get_busno()
135  * Return a pointer to a pretty name for a PCI device.  If the device
137  * is generated from the device's PCI address.
146 	snprintf(buf, sizeof(buf), "pci%d:%d:%d:%d", pci_get_domain(child),  in pcib_child_name()
152  * Some Host-PCI bridge drivers know which resource ranges they can
153  * decode and should only allocate subranges to child PCI devices.
166 	hr->hr_pcib = pcib;  in pcib_host_res_init()
167 	resource_list_init(&hr->hr_rl);  in pcib_host_res_init()
175 	resource_list_free(&hr->hr_rl);  in pcib_host_res_free()
187 		device_printf(hr->hr_pcib, "decoding %d %srange %#jx-%#jx\n",  in pcib_host_res_decodes()
190 	rid = resource_list_add_next(&hr->hr_rl, type, start, end,  in pcib_host_res_decodes()
191 	    end - start + 1);  in pcib_host_res_decodes()
195 		rle = resource_list_find(&hr->hr_rl, type, rid);  in pcib_host_res_decodes()
196 		rle->flags = RLE_PREFETCH;  in pcib_host_res_decodes()
213 	rle = resource_list_find(&hr->hr_rl, type, 0);  in pcib_host_res_alloc()
219 		return (bus_generic_alloc_resource(hr->hr_pcib, dev, type, rid,  in pcib_host_res_alloc()
226 		if (rle->type != type)  in pcib_host_res_alloc()
229 		    ((rle->flags & RLE_PREFETCH) != 0))  in pcib_host_res_alloc()
231 		new_start = ummax(start, rle->start);  in pcib_host_res_alloc()
232 		new_end = ummin(end, rle->end);  in pcib_host_res_alloc()
234 		    new_start + count - 1 > new_end ||  in pcib_host_res_alloc()
237 		r = bus_generic_alloc_resource(hr->hr_pcib, dev, type, rid,  in pcib_host_res_alloc()
241 				device_printf(hr->hr_pcib,  in pcib_host_res_alloc()
242 			    "allocated type %d (%#jx-%#jx) for rid %x of %s\n",  in pcib_host_res_alloc()
255 		rle = resource_list_find(&hr->hr_rl, type, 0);  in pcib_host_res_alloc()
267 	rle = resource_list_find(&hr->hr_rl, rman_get_type(r), 0);  in pcib_host_res_adjust()
273 		return (bus_generic_adjust_resource(hr->hr_pcib, dev, r, start,  in pcib_host_res_adjust()
279 		if (rle->start <= start && rle->end >= end)  in pcib_host_res_adjust()
280 			return (bus_generic_adjust_resource(hr->hr_pcib, dev,  in pcib_host_res_adjust()
295  * Each PCI domain maintains its own resource manager for PCI bus
296  * numbers in that domain.  Domain objects are created on first use.
297  * Host to PCI bridge drivers and PCI-PCI bridge drivers should
298  * allocate their bus ranges from their domain.
301 pci_find_domain(int domain)  in pci_find_domain()  argument
308 		if (d->pd_domain == domain)  in pci_find_domain()
312 	snprintf(buf, sizeof(buf), "PCI domain %d bus numbers", domain);  in pci_find_domain()
314 	d->pd_domain = domain;  in pci_find_domain()
315 	d->pd_bus_rman.rm_start = 0;  in pci_find_domain()
316 	d->pd_bus_rman.rm_end = PCI_BUSMAX;  in pci_find_domain()
317 	d->pd_bus_rman.rm_type = RMAN_ARRAY;  in pci_find_domain()
319 	d->pd_bus_rman.rm_descr = (char *)(d + 1);  in pci_find_domain()
320 	error = rman_init(&d->pd_bus_rman);  in pci_find_domain()
322 		error = rman_manage_region(&d->pd_bus_rman, 0, PCI_BUSMAX);  in pci_find_domain()
324 		panic("Failed to initialize PCI domain %d rman", domain);  in pci_find_domain()
330 pci_domain_alloc_bus(int domain, device_t dev, int *rid, rman_res_t start,  in pci_domain_alloc_bus()  argument
336 	if (domain < 0 || domain > PCI_DOMAINMAX)  in pci_domain_alloc_bus()
338 	d = pci_find_domain(domain);  in pci_domain_alloc_bus()
339 	res = rman_reserve_resource(&d->pd_bus_rman, start, end, count, flags,  in pci_domain_alloc_bus()
350 pci_domain_adjust_bus(int domain, device_t dev, struct resource *r,  in pci_domain_adjust_bus()  argument
357 	if (domain < 0 || domain > PCI_DOMAINMAX)  in pci_domain_adjust_bus()
360 	d = pci_find_domain(domain);  in pci_domain_adjust_bus()
361 	KASSERT(rman_is_region_manager(r, &d->pd_bus_rman), ("bad resource"));  in pci_domain_adjust_bus()
367 pci_domain_release_bus(int domain, device_t dev, struct resource *r)  in pci_domain_release_bus()  argument
373 	if (domain < 0 || domain > PCI_DOMAINMAX)  in pci_domain_release_bus()
376 	d = pci_find_domain(domain);  in pci_domain_release_bus()
377 	KASSERT(rman_is_region_manager(r, &d->pd_bus_rman), ("bad resource"));  in pci_domain_release_bus()
383 pci_domain_activate_bus(int domain, device_t dev, struct resource *r)  in pci_domain_activate_bus()  argument
389 	if (domain < 0 || domain > PCI_DOMAINMAX)  in pci_domain_activate_bus()
392 	d = pci_find_domain(domain);  in pci_domain_activate_bus()
393 	KASSERT(rman_is_region_manager(r, &d->pd_bus_rman), ("bad resource"));  in pci_domain_activate_bus()
399 pci_domain_deactivate_bus(int domain, device_t dev, struct resource *r)  in pci_domain_deactivate_bus()  argument
405 	if (domain < 0 || domain > PCI_DOMAINMAX)  in pci_domain_deactivate_bus()
408 	d = pci_find_domain(domain);  in pci_domain_deactivate_bus()
409 	KASSERT(rman_is_region_manager(r, &d->pd_bus_rman), ("bad resource"));  in pci_domain_deactivate_bus()