1 #include <linux/kernel.h>
2 #include <linux/export.h>
4 #include <linux/of_address.h>
5 #include <linux/of_device.h>
6 #include <linux/of_pci.h>
7 #include <linux/slab.h>
8 #include <asm-generic/pci-bridge.h>
10 static inline int __of_pci_pci_compare(struct device_node
*node
,
15 devfn
= of_pci_get_devfn(node
);
22 struct device_node
*of_pci_find_child_device(struct device_node
*parent
,
25 struct device_node
*node
, *node2
;
27 for_each_child_of_node(parent
, node
) {
28 if (__of_pci_pci_compare(node
, devfn
))
31 * Some OFs create a parent node "multifunc-device" as
32 * a fake root for all functions of a multi-function
33 * device we go down them as well.
35 if (!strcmp(node
->name
, "multifunc-device")) {
36 for_each_child_of_node(node
, node2
) {
37 if (__of_pci_pci_compare(node2
, devfn
)) {
46 EXPORT_SYMBOL_GPL(of_pci_find_child_device
);
49 * of_pci_get_devfn() - Get device and function numbers for a device node
52 * Parses a standard 5-cell PCI resource and returns an 8-bit value that can
53 * be passed to the PCI_SLOT() and PCI_FUNC() macros to extract the device
54 * and function numbers respectively. On error a negative error code is
57 int of_pci_get_devfn(struct device_node
*np
)
62 reg
= of_get_property(np
, "reg", &size
);
64 if (!reg
|| size
< 5 * sizeof(__be32
))
67 return (be32_to_cpup(reg
) >> 8) & 0xff;
69 EXPORT_SYMBOL_GPL(of_pci_get_devfn
);
72 * of_pci_parse_bus_range() - parse the bus-range property of a PCI device
74 * @res: address to a struct resource to return the bus-range
76 * Returns 0 on success or a negative error-code on failure.
78 int of_pci_parse_bus_range(struct device_node
*node
, struct resource
*res
)
83 values
= of_get_property(node
, "bus-range", &len
);
84 if (!values
|| len
< sizeof(*values
) * 2)
87 res
->name
= node
->name
;
88 res
->start
= be32_to_cpup(values
++);
89 res
->end
= be32_to_cpup(values
);
90 res
->flags
= IORESOURCE_BUS
;
94 EXPORT_SYMBOL_GPL(of_pci_parse_bus_range
);
97 * This function will try to obtain the host bridge domain number by
98 * finding a property called "linux,pci-domain" of the given device node.
100 * @node: device tree node with the domain information
102 * Returns the associated domain number from DT in the range [0-0xffff], or
103 * a negative value if the required property is not found.
105 int of_get_pci_domain_nr(struct device_node
*node
)
111 value
= of_get_property(node
, "linux,pci-domain", &len
);
112 if (!value
|| len
< sizeof(*value
))
115 domain
= (u16
)be32_to_cpup(value
);
119 EXPORT_SYMBOL_GPL(of_get_pci_domain_nr
);
122 * of_pci_check_probe_only - Setup probe only mode if linux,pci-probe-only
123 * is present and valid
125 void of_pci_check_probe_only(void)
130 ret
= of_property_read_u32(of_chosen
, "linux,pci-probe-only", &val
);
132 if (ret
== -ENODATA
|| ret
== -EOVERFLOW
)
133 pr_warn("linux,pci-probe-only without valid value, ignoring\n");
138 pci_add_flags(PCI_PROBE_ONLY
);
140 pci_clear_flags(PCI_PROBE_ONLY
);
142 pr_info("PCI: PROBE_ONLY %sabled\n", val
? "en" : "dis");
144 EXPORT_SYMBOL_GPL(of_pci_check_probe_only
);
147 * of_pci_dma_configure - Setup DMA configuration
148 * @dev: ptr to pci_dev struct of the PCI device
150 * Function to update PCI devices's DMA configuration using the same
151 * info from the OF node of host bridge's parent (if any).
153 void of_pci_dma_configure(struct pci_dev
*pci_dev
)
155 struct device
*dev
= &pci_dev
->dev
;
156 struct device
*bridge
= pci_get_host_bridge_device(pci_dev
);
161 of_dma_configure(dev
, bridge
->parent
->of_node
);
162 pci_put_host_bridge_device(bridge
);
164 EXPORT_SYMBOL_GPL(of_pci_dma_configure
);
166 #if defined(CONFIG_OF_ADDRESS)
168 * of_pci_get_host_bridge_resources - Parse PCI host bridge resources from DT
169 * @dev: device node of the host bridge having the range property
170 * @busno: bus number associated with the bridge root bus
171 * @bus_max: maximum number of buses for this bridge
172 * @resources: list where the range of resources will be added after DT parsing
173 * @io_base: pointer to a variable that will contain on return the physical
174 * address for the start of the I/O range. Can be NULL if the caller doesn't
175 * expect IO ranges to be present in the device tree.
177 * It is the caller's job to free the @resources list.
179 * This function will parse the "ranges" property of a PCI host bridge device
180 * node and setup the resource mapping based on its content. It is expected
181 * that the property conforms with the Power ePAPR document.
183 * It returns zero if the range parsing has been successful or a standard error
184 * value if it failed.
186 int of_pci_get_host_bridge_resources(struct device_node
*dev
,
187 unsigned char busno
, unsigned char bus_max
,
188 struct list_head
*resources
, resource_size_t
*io_base
)
190 struct resource_entry
*window
;
191 struct resource
*res
;
192 struct resource
*bus_range
;
193 struct of_pci_range range
;
194 struct of_pci_range_parser parser
;
199 *io_base
= (resource_size_t
)OF_BAD_ADDR
;
201 bus_range
= kzalloc(sizeof(*bus_range
), GFP_KERNEL
);
205 pr_info("PCI host bridge %s ranges:\n", dev
->full_name
);
207 err
= of_pci_parse_bus_range(dev
, bus_range
);
209 bus_range
->start
= busno
;
210 bus_range
->end
= bus_max
;
211 bus_range
->flags
= IORESOURCE_BUS
;
212 pr_info(" No bus range found for %s, using %pR\n",
213 dev
->full_name
, bus_range
);
215 if (bus_range
->end
> bus_range
->start
+ bus_max
)
216 bus_range
->end
= bus_range
->start
+ bus_max
;
218 pci_add_resource(resources
, bus_range
);
220 /* Check for ranges property */
221 err
= of_pci_range_parser_init(&parser
, dev
);
225 pr_debug("Parsing ranges property...\n");
226 for_each_of_pci_range(&parser
, &range
) {
227 /* Read next ranges element */
228 if ((range
.flags
& IORESOURCE_TYPE_BITS
) == IORESOURCE_IO
)
229 snprintf(range_type
, 4, " IO");
230 else if ((range
.flags
& IORESOURCE_TYPE_BITS
) == IORESOURCE_MEM
)
231 snprintf(range_type
, 4, "MEM");
233 snprintf(range_type
, 4, "err");
234 pr_info(" %s %#010llx..%#010llx -> %#010llx\n", range_type
,
235 range
.cpu_addr
, range
.cpu_addr
+ range
.size
- 1,
239 * If we failed translation or got a zero-sized region
240 * then skip this range
242 if (range
.cpu_addr
== OF_BAD_ADDR
|| range
.size
== 0)
245 res
= kzalloc(sizeof(struct resource
), GFP_KERNEL
);
251 err
= of_pci_range_to_resource(&range
, dev
, res
);
257 if (resource_type(res
) == IORESOURCE_IO
) {
259 pr_err("I/O range found for %s. Please provide an io_base pointer to save CPU base address\n",
262 goto conversion_failed
;
264 if (*io_base
!= (resource_size_t
)OF_BAD_ADDR
)
265 pr_warn("More than one I/O resource converted for %s. CPU base address for old range lost!\n",
267 *io_base
= range
.cpu_addr
;
270 pci_add_resource_offset(resources
, res
, res
->start
- range
.pci_addr
);
278 resource_list_for_each_entry(window
, resources
)
280 pci_free_resource_list(resources
);
283 EXPORT_SYMBOL_GPL(of_pci_get_host_bridge_resources
);
284 #endif /* CONFIG_OF_ADDRESS */
286 #ifdef CONFIG_PCI_MSI
288 static LIST_HEAD(of_pci_msi_chip_list
);
289 static DEFINE_MUTEX(of_pci_msi_chip_mutex
);
291 int of_pci_msi_chip_add(struct msi_controller
*chip
)
293 if (!of_property_read_bool(chip
->of_node
, "msi-controller"))
296 mutex_lock(&of_pci_msi_chip_mutex
);
297 list_add(&chip
->list
, &of_pci_msi_chip_list
);
298 mutex_unlock(&of_pci_msi_chip_mutex
);
302 EXPORT_SYMBOL_GPL(of_pci_msi_chip_add
);
304 void of_pci_msi_chip_remove(struct msi_controller
*chip
)
306 mutex_lock(&of_pci_msi_chip_mutex
);
307 list_del(&chip
->list
);
308 mutex_unlock(&of_pci_msi_chip_mutex
);
310 EXPORT_SYMBOL_GPL(of_pci_msi_chip_remove
);
312 struct msi_controller
*of_pci_find_msi_chip_by_node(struct device_node
*of_node
)
314 struct msi_controller
*c
;
316 mutex_lock(&of_pci_msi_chip_mutex
);
317 list_for_each_entry(c
, &of_pci_msi_chip_list
, list
) {
318 if (c
->of_node
== of_node
) {
319 mutex_unlock(&of_pci_msi_chip_mutex
);
323 mutex_unlock(&of_pci_msi_chip_mutex
);
327 EXPORT_SYMBOL_GPL(of_pci_find_msi_chip_by_node
);
329 #endif /* CONFIG_PCI_MSI */