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Sebastian Andrzej Siewior04bea682011-01-24 09:58:55 +05301#include <linux/kernel.h>
Paul Gortmaker97759132011-05-27 17:06:52 -04002#include <linux/export.h>
Grant Likelya6422852011-07-23 23:52:48 -06003#include <linux/of.h>
Liviu Dudaucbe40972014-09-29 15:29:28 +01004#include <linux/of_address.h>
Sebastian Andrzej Siewior04bea682011-01-24 09:58:55 +05305#include <linux/of_pci.h>
Liviu Dudaucbe40972014-09-29 15:29:28 +01006#include <linux/slab.h>
Sebastian Andrzej Siewior04bea682011-01-24 09:58:55 +05307
Benjamin Herrenschmidt98d9f30c82011-04-11 11:37:07 +10008static inline int __of_pci_pci_compare(struct device_node *node,
Thierry Reding45ab9702013-05-16 17:55:18 +02009 unsigned int data)
Sebastian Andrzej Siewior04bea682011-01-24 09:58:55 +053010{
Thierry Reding45ab9702013-05-16 17:55:18 +020011 int devfn;
Sebastian Andrzej Siewior04bea682011-01-24 09:58:55 +053012
Thierry Reding45ab9702013-05-16 17:55:18 +020013 devfn = of_pci_get_devfn(node);
14 if (devfn < 0)
Benjamin Herrenschmidt98d9f30c82011-04-11 11:37:07 +100015 return 0;
Thierry Reding45ab9702013-05-16 17:55:18 +020016
17 return devfn == data;
Sebastian Andrzej Siewior04bea682011-01-24 09:58:55 +053018}
Benjamin Herrenschmidt98d9f30c82011-04-11 11:37:07 +100019
20struct device_node *of_pci_find_child_device(struct device_node *parent,
21 unsigned int devfn)
22{
23 struct device_node *node, *node2;
24
25 for_each_child_of_node(parent, node) {
26 if (__of_pci_pci_compare(node, devfn))
27 return node;
28 /*
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.
32 */
33 if (!strcmp(node->name, "multifunc-device")) {
34 for_each_child_of_node(node, node2) {
35 if (__of_pci_pci_compare(node2, devfn)) {
36 of_node_put(node);
37 return node2;
38 }
39 }
40 }
41 }
42 return NULL;
43}
44EXPORT_SYMBOL_GPL(of_pci_find_child_device);
Thierry Reding45ab9702013-05-16 17:55:18 +020045
46/**
47 * of_pci_get_devfn() - Get device and function numbers for a device node
48 * @np: device node
49 *
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
53 * returned.
54 */
55int of_pci_get_devfn(struct device_node *np)
56{
57 unsigned int size;
58 const __be32 *reg;
59
60 reg = of_get_property(np, "reg", &size);
61
62 if (!reg || size < 5 * sizeof(__be32))
63 return -EINVAL;
64
65 return (be32_to_cpup(reg) >> 8) & 0xff;
66}
67EXPORT_SYMBOL_GPL(of_pci_get_devfn);
Thierry Reding4e23d3f2013-05-16 17:55:19 +020068
69/**
70 * of_pci_parse_bus_range() - parse the bus-range property of a PCI device
71 * @node: device node
72 * @res: address to a struct resource to return the bus-range
73 *
74 * Returns 0 on success or a negative error-code on failure.
75 */
76int of_pci_parse_bus_range(struct device_node *node, struct resource *res)
77{
78 const __be32 *values;
79 int len;
80
81 values = of_get_property(node, "bus-range", &len);
82 if (!values || len < sizeof(*values) * 2)
83 return -EINVAL;
84
85 res->name = node->name;
86 res->start = be32_to_cpup(values++);
87 res->end = be32_to_cpup(values);
88 res->flags = IORESOURCE_BUS;
89
90 return 0;
91}
92EXPORT_SYMBOL_GPL(of_pci_parse_bus_range);
Thomas Petazzoni0d5a6db2013-08-09 22:27:09 +020093
Liviu Dudau41e5c0f2014-09-29 15:29:27 +010094/**
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.
97 *
98 * @node: device tree node with the domain information
99 *
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.
102 */
103int of_get_pci_domain_nr(struct device_node *node)
104{
105 const __be32 *value;
106 int len;
107 u16 domain;
108
109 value = of_get_property(node, "linux,pci-domain", &len);
110 if (!value || len < sizeof(*value))
111 return -EINVAL;
112
113 domain = (u16)be32_to_cpup(value);
114
115 return domain;
116}
117EXPORT_SYMBOL_GPL(of_get_pci_domain_nr);
118
Liviu Dudaucbe40972014-09-29 15:29:28 +0100119#if defined(CONFIG_OF_ADDRESS)
120/**
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.
129 *
130 * It is the caller's job to free the @resources list.
131 *
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.
135 *
136 * It returns zero if the range parsing has been successful or a standard error
137 * value if it failed.
138 */
139int 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)
142{
143 struct resource *res;
144 struct resource *bus_range;
145 struct of_pci_range range;
146 struct of_pci_range_parser parser;
147 char range_type[4];
148 int err;
149
150 if (io_base)
151 *io_base = (resource_size_t)OF_BAD_ADDR;
152
153 bus_range = kzalloc(sizeof(*bus_range), GFP_KERNEL);
154 if (!bus_range)
155 return -ENOMEM;
156
157 pr_info("PCI host bridge %s ranges:\n", dev->full_name);
158
159 err = of_pci_parse_bus_range(dev, bus_range);
160 if (err) {
161 bus_range->start = busno;
162 bus_range->end = bus_max;
163 bus_range->flags = IORESOURCE_BUS;
164 pr_info(" No bus range found for %s, using %pR\n",
165 dev->full_name, bus_range);
166 } else {
167 if (bus_range->end > bus_range->start + bus_max)
168 bus_range->end = bus_range->start + bus_max;
169 }
170 pci_add_resource(resources, bus_range);
171
172 /* Check for ranges property */
173 err = of_pci_range_parser_init(&parser, dev);
174 if (err)
175 goto parse_failed;
176
177 pr_debug("Parsing ranges property...\n");
178 for_each_of_pci_range(&parser, &range) {
179 /* Read next ranges element */
180 if ((range.flags & IORESOURCE_TYPE_BITS) == IORESOURCE_IO)
181 snprintf(range_type, 4, " IO");
182 else if ((range.flags & IORESOURCE_TYPE_BITS) == IORESOURCE_MEM)
183 snprintf(range_type, 4, "MEM");
184 else
185 snprintf(range_type, 4, "err");
186 pr_info(" %s %#010llx..%#010llx -> %#010llx\n", range_type,
187 range.cpu_addr, range.cpu_addr + range.size - 1,
188 range.pci_addr);
189
190 /*
191 * If we failed translation or got a zero-sized region
192 * then skip this range
193 */
194 if (range.cpu_addr == OF_BAD_ADDR || range.size == 0)
195 continue;
196
197 res = kzalloc(sizeof(struct resource), GFP_KERNEL);
198 if (!res) {
199 err = -ENOMEM;
200 goto parse_failed;
201 }
202
203 err = of_pci_range_to_resource(&range, dev, res);
204 if (err)
205 goto conversion_failed;
206
207 if (resource_type(res) == IORESOURCE_IO) {
208 if (!io_base) {
209 pr_err("I/O range found for %s. Please provide an io_base pointer to save CPU base address\n",
210 dev->full_name);
211 err = -EINVAL;
212 goto conversion_failed;
213 }
214 if (*io_base != (resource_size_t)OF_BAD_ADDR)
215 pr_warn("More than one I/O resource converted for %s. CPU base address for old range lost!\n",
216 dev->full_name);
217 *io_base = range.cpu_addr;
218 }
219
220 pci_add_resource_offset(resources, res, res->start - range.pci_addr);
221 }
222
223 return 0;
224
225conversion_failed:
226 kfree(res);
227parse_failed:
228 pci_free_resource_list(resources);
229 return err;
230}
231EXPORT_SYMBOL_GPL(of_pci_get_host_bridge_resources);
232#endif /* CONFIG_OF_ADDRESS */
233
Thomas Petazzoni0d5a6db2013-08-09 22:27:09 +0200234#ifdef CONFIG_PCI_MSI
235
236static LIST_HEAD(of_pci_msi_chip_list);
237static DEFINE_MUTEX(of_pci_msi_chip_mutex);
238
239int of_pci_msi_chip_add(struct msi_chip *chip)
240{
241 if (!of_property_read_bool(chip->of_node, "msi-controller"))
242 return -EINVAL;
243
244 mutex_lock(&of_pci_msi_chip_mutex);
245 list_add(&chip->list, &of_pci_msi_chip_list);
246 mutex_unlock(&of_pci_msi_chip_mutex);
247
248 return 0;
249}
250EXPORT_SYMBOL_GPL(of_pci_msi_chip_add);
251
252void of_pci_msi_chip_remove(struct msi_chip *chip)
253{
254 mutex_lock(&of_pci_msi_chip_mutex);
255 list_del(&chip->list);
256 mutex_unlock(&of_pci_msi_chip_mutex);
257}
258EXPORT_SYMBOL_GPL(of_pci_msi_chip_remove);
259
260struct msi_chip *of_pci_find_msi_chip_by_node(struct device_node *of_node)
261{
262 struct msi_chip *c;
263
264 mutex_lock(&of_pci_msi_chip_mutex);
265 list_for_each_entry(c, &of_pci_msi_chip_list, list) {
266 if (c->of_node == of_node) {
267 mutex_unlock(&of_pci_msi_chip_mutex);
268 return c;
269 }
270 }
271 mutex_unlock(&of_pci_msi_chip_mutex);
272
273 return NULL;
274}
275EXPORT_SYMBOL_GPL(of_pci_find_msi_chip_by_node);
276
277#endif /* CONFIG_PCI_MSI */