1 #include <linux/kernel.h>
2 #include <linux/export.h>
4 #include <linux/of_address.h>
5 #include <linux/of_pci.h>
6 #include <linux/slab.h>
8 static inline int __of_pci_pci_compare(struct device_node
*node
,
13 devfn
= of_pci_get_devfn(node
);
20 struct device_node
*of_pci_find_child_device(struct device_node
*parent
,
23 struct device_node
*node
, *node2
;
25 for_each_child_of_node(parent
, node
) {
26 if (__of_pci_pci_compare(node
, devfn
))
29 * Some OFs create a parent node "multifunc-device" as
30 * a fake root for all functions of a multi-function
31 * device we go down them as well.
33 if (!strcmp(node
->name
, "multifunc-device")) {
34 for_each_child_of_node(node
, node2
) {
35 if (__of_pci_pci_compare(node2
, devfn
)) {
44 EXPORT_SYMBOL_GPL(of_pci_find_child_device
);
47 * of_pci_get_devfn() - Get device and function numbers for a device node
50 * Parses a standard 5-cell PCI resource and returns an 8-bit value that can
51 * be passed to the PCI_SLOT() and PCI_FUNC() macros to extract the device
52 * and function numbers respectively. On error a negative error code is
55 int of_pci_get_devfn(struct device_node
*np
)
60 reg
= of_get_property(np
, "reg", &size
);
62 if (!reg
|| size
< 5 * sizeof(__be32
))
65 return (be32_to_cpup(reg
) >> 8) & 0xff;
67 EXPORT_SYMBOL_GPL(of_pci_get_devfn
);
70 * of_pci_parse_bus_range() - parse the bus-range property of a PCI device
72 * @res: address to a struct resource to return the bus-range
74 * Returns 0 on success or a negative error-code on failure.
76 int of_pci_parse_bus_range(struct device_node
*node
, struct resource
*res
)
81 values
= of_get_property(node
, "bus-range", &len
);
82 if (!values
|| len
< sizeof(*values
) * 2)
85 res
->name
= node
->name
;
86 res
->start
= be32_to_cpup(values
++);
87 res
->end
= be32_to_cpup(values
);
88 res
->flags
= IORESOURCE_BUS
;
92 EXPORT_SYMBOL_GPL(of_pci_parse_bus_range
);
95 * This function will try to obtain the host bridge domain number by
96 * finding a property called "linux,pci-domain" of the given device node.
98 * @node: device tree node with the domain information
100 * Returns the associated domain number from DT in the range [0-0xffff], or
101 * a negative value if the required property is not found.
103 int of_get_pci_domain_nr(struct device_node
*node
)
109 value
= of_get_property(node
, "linux,pci-domain", &len
);
110 if (!value
|| len
< sizeof(*value
))
113 domain
= (u16
)be32_to_cpup(value
);
117 EXPORT_SYMBOL_GPL(of_get_pci_domain_nr
);
119 #if defined(CONFIG_OF_ADDRESS)
121 * of_pci_get_host_bridge_resources - Parse PCI host bridge resources from DT
122 * @dev: device node of the host bridge having the range property
123 * @busno: bus number associated with the bridge root bus
124 * @bus_max: maximum number of buses for this bridge
125 * @resources: list where the range of resources will be added after DT parsing
126 * @io_base: pointer to a variable that will contain on return the physical
127 * address for the start of the I/O range. Can be NULL if the caller doesn't
128 * expect IO ranges to be present in the device tree.
130 * It is the caller's job to free the @resources list.
132 * This function will parse the "ranges" property of a PCI host bridge device
133 * node and setup the resource mapping based on its content. It is expected
134 * that the property conforms with the Power ePAPR document.
136 * It returns zero if the range parsing has been successful or a standard error
137 * value if it failed.
139 int of_pci_get_host_bridge_resources(struct device_node
*dev
,
140 unsigned char busno
, unsigned char bus_max
,
141 struct list_head
*resources
, resource_size_t
*io_base
)
143 struct resource_entry
*window
;
144 struct resource
*res
;
145 struct resource
*bus_range
;
146 struct of_pci_range range
;
147 struct of_pci_range_parser parser
;
152 *io_base
= (resource_size_t
)OF_BAD_ADDR
;
154 bus_range
= kzalloc(sizeof(*bus_range
), GFP_KERNEL
);
158 pr_info("PCI host bridge %s ranges:\n", dev
->full_name
);
160 err
= of_pci_parse_bus_range(dev
, bus_range
);
162 bus_range
->start
= busno
;
163 bus_range
->end
= bus_max
;
164 bus_range
->flags
= IORESOURCE_BUS
;
165 pr_info(" No bus range found for %s, using %pR\n",
166 dev
->full_name
, bus_range
);
168 if (bus_range
->end
> bus_range
->start
+ bus_max
)
169 bus_range
->end
= bus_range
->start
+ bus_max
;
171 pci_add_resource(resources
, bus_range
);
173 /* Check for ranges property */
174 err
= of_pci_range_parser_init(&parser
, dev
);
178 pr_debug("Parsing ranges property...\n");
179 for_each_of_pci_range(&parser
, &range
) {
180 /* Read next ranges element */
181 if ((range
.flags
& IORESOURCE_TYPE_BITS
) == IORESOURCE_IO
)
182 snprintf(range_type
, 4, " IO");
183 else if ((range
.flags
& IORESOURCE_TYPE_BITS
) == IORESOURCE_MEM
)
184 snprintf(range_type
, 4, "MEM");
186 snprintf(range_type
, 4, "err");
187 pr_info(" %s %#010llx..%#010llx -> %#010llx\n", range_type
,
188 range
.cpu_addr
, range
.cpu_addr
+ range
.size
- 1,
192 * If we failed translation or got a zero-sized region
193 * then skip this range
195 if (range
.cpu_addr
== OF_BAD_ADDR
|| range
.size
== 0)
198 res
= kzalloc(sizeof(struct resource
), GFP_KERNEL
);
204 err
= of_pci_range_to_resource(&range
, dev
, res
);
206 goto conversion_failed
;
208 if (resource_type(res
) == IORESOURCE_IO
) {
210 pr_err("I/O range found for %s. Please provide an io_base pointer to save CPU base address\n",
213 goto conversion_failed
;
215 if (*io_base
!= (resource_size_t
)OF_BAD_ADDR
)
216 pr_warn("More than one I/O resource converted for %s. CPU base address for old range lost!\n",
218 *io_base
= range
.cpu_addr
;
221 pci_add_resource_offset(resources
, res
, res
->start
- range
.pci_addr
);
229 resource_list_for_each_entry(window
, resources
)
231 pci_free_resource_list(resources
);
234 EXPORT_SYMBOL_GPL(of_pci_get_host_bridge_resources
);
235 #endif /* CONFIG_OF_ADDRESS */
237 #ifdef CONFIG_PCI_MSI
239 static LIST_HEAD(of_pci_msi_chip_list
);
240 static DEFINE_MUTEX(of_pci_msi_chip_mutex
);
242 int of_pci_msi_chip_add(struct msi_controller
*chip
)
244 if (!of_property_read_bool(chip
->of_node
, "msi-controller"))
247 mutex_lock(&of_pci_msi_chip_mutex
);
248 list_add(&chip
->list
, &of_pci_msi_chip_list
);
249 mutex_unlock(&of_pci_msi_chip_mutex
);
253 EXPORT_SYMBOL_GPL(of_pci_msi_chip_add
);
255 void of_pci_msi_chip_remove(struct msi_controller
*chip
)
257 mutex_lock(&of_pci_msi_chip_mutex
);
258 list_del(&chip
->list
);
259 mutex_unlock(&of_pci_msi_chip_mutex
);
261 EXPORT_SYMBOL_GPL(of_pci_msi_chip_remove
);
263 struct msi_controller
*of_pci_find_msi_chip_by_node(struct device_node
*of_node
)
265 struct msi_controller
*c
;
267 mutex_lock(&of_pci_msi_chip_mutex
);
268 list_for_each_entry(c
, &of_pci_msi_chip_list
, list
) {
269 if (c
->of_node
== of_node
) {
270 mutex_unlock(&of_pci_msi_chip_mutex
);
274 mutex_unlock(&of_pci_msi_chip_mutex
);
278 EXPORT_SYMBOL_GPL(of_pci_find_msi_chip_by_node
);
280 #endif /* CONFIG_PCI_MSI */