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1#include <linux/kernel.h>
2#include <linux/of.h>
3#include <linux/of_pci.h>
4#include <asm/prom.h>
5
6static inline int __of_pci_pci_compare(struct device_node *node,
7 unsigned int devfn)
8{
9 unsigned int size;
10 const __be32 *reg = of_get_property(node, "reg", &size);
11
12 if (!reg || size < 5 * sizeof(__be32))
13 return 0;
14 return ((be32_to_cpup(®[0]) >> 8) & 0xff) == devfn;
15}
16
17struct device_node *of_pci_find_child_device(struct device_node *parent,
18 unsigned int devfn)
19{
20 struct device_node *node, *node2;
21
22 for_each_child_of_node(parent, node) {
23 if (__of_pci_pci_compare(node, devfn))
24 return node;
25 /*
26 * Some OFs create a parent node "multifunc-device" as
27 * a fake root for all functions of a multi-function
28 * device we go down them as well.
29 */
30 if (!strcmp(node->name, "multifunc-device")) {
31 for_each_child_of_node(node, node2) {
32 if (__of_pci_pci_compare(node2, devfn)) {
33 of_node_put(node);
34 return node2;
35 }
36 }
37 }
38 }
39 return NULL;
40}
41EXPORT_SYMBOL_GPL(of_pci_find_child_device);
1#include <linux/kernel.h>
2#include <linux/export.h>
3#include <linux/of.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
9static inline int __of_pci_pci_compare(struct device_node *node,
10 unsigned int data)
11{
12 int devfn;
13
14 devfn = of_pci_get_devfn(node);
15 if (devfn < 0)
16 return 0;
17
18 return devfn == data;
19}
20
21struct device_node *of_pci_find_child_device(struct device_node *parent,
22 unsigned int devfn)
23{
24 struct device_node *node, *node2;
25
26 for_each_child_of_node(parent, node) {
27 if (__of_pci_pci_compare(node, devfn))
28 return node;
29 /*
30 * Some OFs create a parent node "multifunc-device" as
31 * a fake root for all functions of a multi-function
32 * device we go down them as well.
33 */
34 if (!strcmp(node->name, "multifunc-device")) {
35 for_each_child_of_node(node, node2) {
36 if (__of_pci_pci_compare(node2, devfn)) {
37 of_node_put(node);
38 return node2;
39 }
40 }
41 }
42 }
43 return NULL;
44}
45EXPORT_SYMBOL_GPL(of_pci_find_child_device);
46
47/**
48 * of_pci_get_devfn() - Get device and function numbers for a device node
49 * @np: device node
50 *
51 * Parses a standard 5-cell PCI resource and returns an 8-bit value that can
52 * be passed to the PCI_SLOT() and PCI_FUNC() macros to extract the device
53 * and function numbers respectively. On error a negative error code is
54 * returned.
55 */
56int of_pci_get_devfn(struct device_node *np)
57{
58 unsigned int size;
59 const __be32 *reg;
60
61 reg = of_get_property(np, "reg", &size);
62
63 if (!reg || size < 5 * sizeof(__be32))
64 return -EINVAL;
65
66 return (be32_to_cpup(reg) >> 8) & 0xff;
67}
68EXPORT_SYMBOL_GPL(of_pci_get_devfn);
69
70/**
71 * of_pci_parse_bus_range() - parse the bus-range property of a PCI device
72 * @node: device node
73 * @res: address to a struct resource to return the bus-range
74 *
75 * Returns 0 on success or a negative error-code on failure.
76 */
77int of_pci_parse_bus_range(struct device_node *node, struct resource *res)
78{
79 const __be32 *values;
80 int len;
81
82 values = of_get_property(node, "bus-range", &len);
83 if (!values || len < sizeof(*values) * 2)
84 return -EINVAL;
85
86 res->name = node->name;
87 res->start = be32_to_cpup(values++);
88 res->end = be32_to_cpup(values);
89 res->flags = IORESOURCE_BUS;
90
91 return 0;
92}
93EXPORT_SYMBOL_GPL(of_pci_parse_bus_range);
94
95/**
96 * This function will try to obtain the host bridge domain number by
97 * finding a property called "linux,pci-domain" of the given device node.
98 *
99 * @node: device tree node with the domain information
100 *
101 * Returns the associated domain number from DT in the range [0-0xffff], or
102 * a negative value if the required property is not found.
103 */
104int of_get_pci_domain_nr(struct device_node *node)
105{
106 const __be32 *value;
107 int len;
108 u16 domain;
109
110 value = of_get_property(node, "linux,pci-domain", &len);
111 if (!value || len < sizeof(*value))
112 return -EINVAL;
113
114 domain = (u16)be32_to_cpup(value);
115
116 return domain;
117}
118EXPORT_SYMBOL_GPL(of_get_pci_domain_nr);
119
120/**
121 * of_pci_check_probe_only - Setup probe only mode if linux,pci-probe-only
122 * is present and valid
123 */
124void of_pci_check_probe_only(void)
125{
126 u32 val;
127 int ret;
128
129 ret = of_property_read_u32(of_chosen, "linux,pci-probe-only", &val);
130 if (ret) {
131 if (ret == -ENODATA || ret == -EOVERFLOW)
132 pr_warn("linux,pci-probe-only without valid value, ignoring\n");
133 return;
134 }
135
136 if (val)
137 pci_add_flags(PCI_PROBE_ONLY);
138 else
139 pci_clear_flags(PCI_PROBE_ONLY);
140
141 pr_info("PCI: PROBE_ONLY %sabled\n", val ? "en" : "dis");
142}
143EXPORT_SYMBOL_GPL(of_pci_check_probe_only);
144
145#if defined(CONFIG_OF_ADDRESS)
146/**
147 * of_pci_get_host_bridge_resources - Parse PCI host bridge resources from DT
148 * @dev: device node of the host bridge having the range property
149 * @busno: bus number associated with the bridge root bus
150 * @bus_max: maximum number of buses for this bridge
151 * @resources: list where the range of resources will be added after DT parsing
152 * @io_base: pointer to a variable that will contain on return the physical
153 * address for the start of the I/O range. Can be NULL if the caller doesn't
154 * expect IO ranges to be present in the device tree.
155 *
156 * It is the caller's job to free the @resources list.
157 *
158 * This function will parse the "ranges" property of a PCI host bridge device
159 * node and setup the resource mapping based on its content. It is expected
160 * that the property conforms with the Power ePAPR document.
161 *
162 * It returns zero if the range parsing has been successful or a standard error
163 * value if it failed.
164 */
165int of_pci_get_host_bridge_resources(struct device_node *dev,
166 unsigned char busno, unsigned char bus_max,
167 struct list_head *resources, resource_size_t *io_base)
168{
169 struct resource_entry *window;
170 struct resource *res;
171 struct resource *bus_range;
172 struct of_pci_range range;
173 struct of_pci_range_parser parser;
174 char range_type[4];
175 int err;
176
177 if (io_base)
178 *io_base = (resource_size_t)OF_BAD_ADDR;
179
180 bus_range = kzalloc(sizeof(*bus_range), GFP_KERNEL);
181 if (!bus_range)
182 return -ENOMEM;
183
184 pr_info("PCI host bridge %s ranges:\n", dev->full_name);
185
186 err = of_pci_parse_bus_range(dev, bus_range);
187 if (err) {
188 bus_range->start = busno;
189 bus_range->end = bus_max;
190 bus_range->flags = IORESOURCE_BUS;
191 pr_info(" No bus range found for %s, using %pR\n",
192 dev->full_name, bus_range);
193 } else {
194 if (bus_range->end > bus_range->start + bus_max)
195 bus_range->end = bus_range->start + bus_max;
196 }
197 pci_add_resource(resources, bus_range);
198
199 /* Check for ranges property */
200 err = of_pci_range_parser_init(&parser, dev);
201 if (err)
202 goto parse_failed;
203
204 pr_debug("Parsing ranges property...\n");
205 for_each_of_pci_range(&parser, &range) {
206 /* Read next ranges element */
207 if ((range.flags & IORESOURCE_TYPE_BITS) == IORESOURCE_IO)
208 snprintf(range_type, 4, " IO");
209 else if ((range.flags & IORESOURCE_TYPE_BITS) == IORESOURCE_MEM)
210 snprintf(range_type, 4, "MEM");
211 else
212 snprintf(range_type, 4, "err");
213 pr_info(" %s %#010llx..%#010llx -> %#010llx\n", range_type,
214 range.cpu_addr, range.cpu_addr + range.size - 1,
215 range.pci_addr);
216
217 /*
218 * If we failed translation or got a zero-sized region
219 * then skip this range
220 */
221 if (range.cpu_addr == OF_BAD_ADDR || range.size == 0)
222 continue;
223
224 res = kzalloc(sizeof(struct resource), GFP_KERNEL);
225 if (!res) {
226 err = -ENOMEM;
227 goto parse_failed;
228 }
229
230 err = of_pci_range_to_resource(&range, dev, res);
231 if (err) {
232 kfree(res);
233 continue;
234 }
235
236 if (resource_type(res) == IORESOURCE_IO) {
237 if (!io_base) {
238 pr_err("I/O range found for %s. Please provide an io_base pointer to save CPU base address\n",
239 dev->full_name);
240 err = -EINVAL;
241 goto conversion_failed;
242 }
243 if (*io_base != (resource_size_t)OF_BAD_ADDR)
244 pr_warn("More than one I/O resource converted for %s. CPU base address for old range lost!\n",
245 dev->full_name);
246 *io_base = range.cpu_addr;
247 }
248
249 pci_add_resource_offset(resources, res, res->start - range.pci_addr);
250 }
251
252 return 0;
253
254conversion_failed:
255 kfree(res);
256parse_failed:
257 resource_list_for_each_entry(window, resources)
258 kfree(window->res);
259 pci_free_resource_list(resources);
260 return err;
261}
262EXPORT_SYMBOL_GPL(of_pci_get_host_bridge_resources);
263#endif /* CONFIG_OF_ADDRESS */
264
265#ifdef CONFIG_PCI_MSI
266
267static LIST_HEAD(of_pci_msi_chip_list);
268static DEFINE_MUTEX(of_pci_msi_chip_mutex);
269
270int of_pci_msi_chip_add(struct msi_controller *chip)
271{
272 if (!of_property_read_bool(chip->of_node, "msi-controller"))
273 return -EINVAL;
274
275 mutex_lock(&of_pci_msi_chip_mutex);
276 list_add(&chip->list, &of_pci_msi_chip_list);
277 mutex_unlock(&of_pci_msi_chip_mutex);
278
279 return 0;
280}
281EXPORT_SYMBOL_GPL(of_pci_msi_chip_add);
282
283void of_pci_msi_chip_remove(struct msi_controller *chip)
284{
285 mutex_lock(&of_pci_msi_chip_mutex);
286 list_del(&chip->list);
287 mutex_unlock(&of_pci_msi_chip_mutex);
288}
289EXPORT_SYMBOL_GPL(of_pci_msi_chip_remove);
290
291struct msi_controller *of_pci_find_msi_chip_by_node(struct device_node *of_node)
292{
293 struct msi_controller *c;
294
295 mutex_lock(&of_pci_msi_chip_mutex);
296 list_for_each_entry(c, &of_pci_msi_chip_list, list) {
297 if (c->of_node == of_node) {
298 mutex_unlock(&of_pci_msi_chip_mutex);
299 return c;
300 }
301 }
302 mutex_unlock(&of_pci_msi_chip_mutex);
303
304 return NULL;
305}
306EXPORT_SYMBOL_GPL(of_pci_find_msi_chip_by_node);
307
308#endif /* CONFIG_PCI_MSI */