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Linux/arch/arm64/kernel/pci.c

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  1 /*
  2  * Code borrowed from powerpc/kernel/pci-common.c
  3  *
  4  * Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM
  5  * Copyright (C) 2014 ARM Ltd.
  6  *
  7  * This program is free software; you can redistribute it and/or
  8  * modify it under the terms of the GNU General Public License
  9  * version 2 as published by the Free Software Foundation.
 10  *
 11  */
 12 
 13 #include <linux/acpi.h>
 14 #include <linux/init.h>
 15 #include <linux/io.h>
 16 #include <linux/kernel.h>
 17 #include <linux/mm.h>
 18 #include <linux/of_pci.h>
 19 #include <linux/of_platform.h>
 20 #include <linux/pci.h>
 21 #include <linux/pci-acpi.h>
 22 #include <linux/pci-ecam.h>
 23 #include <linux/slab.h>
 24 
 25 #ifdef CONFIG_ACPI
 26 /*
 27  * Try to assign the IRQ number when probing a new device
 28  */
 29 int pcibios_alloc_irq(struct pci_dev *dev)
 30 {
 31         if (!acpi_disabled)
 32                 acpi_pci_irq_enable(dev);
 33 
 34         return 0;
 35 }
 36 #endif
 37 
 38 /*
 39  * raw_pci_read/write - Platform-specific PCI config space access.
 40  */
 41 int raw_pci_read(unsigned int domain, unsigned int bus,
 42                   unsigned int devfn, int reg, int len, u32 *val)
 43 {
 44         struct pci_bus *b = pci_find_bus(domain, bus);
 45 
 46         if (!b)
 47                 return PCIBIOS_DEVICE_NOT_FOUND;
 48         return b->ops->read(b, devfn, reg, len, val);
 49 }
 50 
 51 int raw_pci_write(unsigned int domain, unsigned int bus,
 52                 unsigned int devfn, int reg, int len, u32 val)
 53 {
 54         struct pci_bus *b = pci_find_bus(domain, bus);
 55 
 56         if (!b)
 57                 return PCIBIOS_DEVICE_NOT_FOUND;
 58         return b->ops->write(b, devfn, reg, len, val);
 59 }
 60 
 61 #ifdef CONFIG_NUMA
 62 
 63 int pcibus_to_node(struct pci_bus *bus)
 64 {
 65         return dev_to_node(&bus->dev);
 66 }
 67 EXPORT_SYMBOL(pcibus_to_node);
 68 
 69 #endif
 70 
 71 #ifdef CONFIG_ACPI
 72 
 73 struct acpi_pci_generic_root_info {
 74         struct acpi_pci_root_info       common;
 75         struct pci_config_window        *cfg;   /* config space mapping */
 76 };
 77 
 78 int acpi_pci_bus_find_domain_nr(struct pci_bus *bus)
 79 {
 80         struct pci_config_window *cfg = bus->sysdata;
 81         struct acpi_device *adev = to_acpi_device(cfg->parent);
 82         struct acpi_pci_root *root = acpi_driver_data(adev);
 83 
 84         return root->segment;
 85 }
 86 
 87 int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
 88 {
 89         if (!acpi_disabled) {
 90                 struct pci_config_window *cfg = bridge->bus->sysdata;
 91                 struct acpi_device *adev = to_acpi_device(cfg->parent);
 92                 struct device *bus_dev = &bridge->bus->dev;
 93 
 94                 ACPI_COMPANION_SET(&bridge->dev, adev);
 95                 set_dev_node(bus_dev, acpi_get_node(acpi_device_handle(adev)));
 96         }
 97 
 98         return 0;
 99 }
100 
101 static int pci_acpi_root_prepare_resources(struct acpi_pci_root_info *ci)
102 {
103         struct resource_entry *entry, *tmp;
104         int status;
105 
106         status = acpi_pci_probe_root_resources(ci);
107         resource_list_for_each_entry_safe(entry, tmp, &ci->resources) {
108                 if (!(entry->res->flags & IORESOURCE_WINDOW))
109                         resource_list_destroy_entry(entry);
110         }
111         return status;
112 }
113 
114 /*
115  * Lookup the bus range for the domain in MCFG, and set up config space
116  * mapping.
117  */
118 static struct pci_config_window *
119 pci_acpi_setup_ecam_mapping(struct acpi_pci_root *root)
120 {
121         struct device *dev = &root->device->dev;
122         struct resource *bus_res = &root->secondary;
123         u16 seg = root->segment;
124         struct pci_ecam_ops *ecam_ops;
125         struct resource cfgres;
126         struct acpi_device *adev;
127         struct pci_config_window *cfg;
128         int ret;
129 
130         ret = pci_mcfg_lookup(root, &cfgres, &ecam_ops);
131         if (ret) {
132                 dev_err(dev, "%04x:%pR ECAM region not found\n", seg, bus_res);
133                 return NULL;
134         }
135 
136         adev = acpi_resource_consumer(&cfgres);
137         if (adev)
138                 dev_info(dev, "ECAM area %pR reserved by %s\n", &cfgres,
139                          dev_name(&adev->dev));
140         else
141                 dev_warn(dev, FW_BUG "ECAM area %pR not reserved in ACPI namespace\n",
142                          &cfgres);
143 
144         cfg = pci_ecam_create(dev, &cfgres, bus_res, ecam_ops);
145         if (IS_ERR(cfg)) {
146                 dev_err(dev, "%04x:%pR error %ld mapping ECAM\n", seg, bus_res,
147                         PTR_ERR(cfg));
148                 return NULL;
149         }
150 
151         return cfg;
152 }
153 
154 /* release_info: free resources allocated by init_info */
155 static void pci_acpi_generic_release_info(struct acpi_pci_root_info *ci)
156 {
157         struct acpi_pci_generic_root_info *ri;
158 
159         ri = container_of(ci, struct acpi_pci_generic_root_info, common);
160         pci_ecam_free(ri->cfg);
161         kfree(ci->ops);
162         kfree(ri);
163 }
164 
165 /* Interface called from ACPI code to setup PCI host controller */
166 struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
167 {
168         int node = acpi_get_node(root->device->handle);
169         struct acpi_pci_generic_root_info *ri;
170         struct pci_bus *bus, *child;
171         struct acpi_pci_root_ops *root_ops;
172 
173         ri = kzalloc_node(sizeof(*ri), GFP_KERNEL, node);
174         if (!ri)
175                 return NULL;
176 
177         root_ops = kzalloc_node(sizeof(*root_ops), GFP_KERNEL, node);
178         if (!root_ops) {
179                 kfree(ri);
180                 return NULL;
181         }
182 
183         ri->cfg = pci_acpi_setup_ecam_mapping(root);
184         if (!ri->cfg) {
185                 kfree(ri);
186                 kfree(root_ops);
187                 return NULL;
188         }
189 
190         root_ops->release_info = pci_acpi_generic_release_info;
191         root_ops->prepare_resources = pci_acpi_root_prepare_resources;
192         root_ops->pci_ops = &ri->cfg->ops->pci_ops;
193         bus = acpi_pci_root_create(root, root_ops, &ri->common, ri->cfg);
194         if (!bus)
195                 return NULL;
196 
197         pci_bus_size_bridges(bus);
198         pci_bus_assign_resources(bus);
199 
200         list_for_each_entry(child, &bus->children, node)
201                 pcie_bus_configure_settings(child);
202 
203         return bus;
204 }
205 
206 void pcibios_add_bus(struct pci_bus *bus)
207 {
208         acpi_pci_add_bus(bus);
209 }
210 
211 void pcibios_remove_bus(struct pci_bus *bus)
212 {
213         acpi_pci_remove_bus(bus);
214 }
215 
216 #endif
217 

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