blob: 589b30c68e1427efc280f13d0bbcaf660e816ab0 [file] [log] [blame]
Rob Herring606ad422016-06-15 08:32:18 -05001#define pr_fmt(fmt) "OF: PCI: " fmt
2
Sebastian Andrzej Siewior04bea682011-01-24 09:58:55 +05303#include <linux/kernel.h>
Paul Gortmaker97759132011-05-27 17:06:52 -04004#include <linux/export.h>
Grant Likelya6422852011-07-23 23:52:48 -06005#include <linux/of.h>
Liviu Dudaucbe40972014-09-29 15:29:28 +01006#include <linux/of_address.h>
Murali Karicheric49b8fc2015-03-03 12:52:12 -05007#include <linux/of_device.h>
Sebastian Andrzej Siewior04bea682011-01-24 09:58:55 +05308#include <linux/of_pci.h>
Liviu Dudaucbe40972014-09-29 15:29:28 +01009#include <linux/slab.h>
Sebastian Andrzej Siewior04bea682011-01-24 09:58:55 +053010
Benjamin Herrenschmidt98d9f30c82011-04-11 11:37:07 +100011static inline int __of_pci_pci_compare(struct device_node *node,
Thierry Reding45ab9702013-05-16 17:55:18 +020012 unsigned int data)
Sebastian Andrzej Siewior04bea682011-01-24 09:58:55 +053013{
Thierry Reding45ab9702013-05-16 17:55:18 +020014 int devfn;
Sebastian Andrzej Siewior04bea682011-01-24 09:58:55 +053015
Thierry Reding45ab9702013-05-16 17:55:18 +020016 devfn = of_pci_get_devfn(node);
17 if (devfn < 0)
Benjamin Herrenschmidt98d9f30c82011-04-11 11:37:07 +100018 return 0;
Thierry Reding45ab9702013-05-16 17:55:18 +020019
20 return devfn == data;
Sebastian Andrzej Siewior04bea682011-01-24 09:58:55 +053021}
Benjamin Herrenschmidt98d9f30c82011-04-11 11:37:07 +100022
23struct device_node *of_pci_find_child_device(struct device_node *parent,
24 unsigned int devfn)
25{
26 struct device_node *node, *node2;
27
28 for_each_child_of_node(parent, node) {
29 if (__of_pci_pci_compare(node, devfn))
30 return node;
31 /*
32 * Some OFs create a parent node "multifunc-device" as
33 * a fake root for all functions of a multi-function
34 * device we go down them as well.
35 */
36 if (!strcmp(node->name, "multifunc-device")) {
37 for_each_child_of_node(node, node2) {
38 if (__of_pci_pci_compare(node2, devfn)) {
39 of_node_put(node);
40 return node2;
41 }
42 }
43 }
44 }
45 return NULL;
46}
47EXPORT_SYMBOL_GPL(of_pci_find_child_device);
Thierry Reding45ab9702013-05-16 17:55:18 +020048
49/**
50 * of_pci_get_devfn() - Get device and function numbers for a device node
51 * @np: device node
52 *
53 * Parses a standard 5-cell PCI resource and returns an 8-bit value that can
54 * be passed to the PCI_SLOT() and PCI_FUNC() macros to extract the device
55 * and function numbers respectively. On error a negative error code is
56 * returned.
57 */
58int of_pci_get_devfn(struct device_node *np)
59{
60 unsigned int size;
61 const __be32 *reg;
62
63 reg = of_get_property(np, "reg", &size);
64
65 if (!reg || size < 5 * sizeof(__be32))
66 return -EINVAL;
67
68 return (be32_to_cpup(reg) >> 8) & 0xff;
69}
70EXPORT_SYMBOL_GPL(of_pci_get_devfn);
Thierry Reding4e23d3f2013-05-16 17:55:19 +020071
72/**
73 * of_pci_parse_bus_range() - parse the bus-range property of a PCI device
74 * @node: device node
75 * @res: address to a struct resource to return the bus-range
76 *
77 * Returns 0 on success or a negative error-code on failure.
78 */
79int of_pci_parse_bus_range(struct device_node *node, struct resource *res)
80{
81 const __be32 *values;
82 int len;
83
84 values = of_get_property(node, "bus-range", &len);
85 if (!values || len < sizeof(*values) * 2)
86 return -EINVAL;
87
88 res->name = node->name;
89 res->start = be32_to_cpup(values++);
90 res->end = be32_to_cpup(values);
91 res->flags = IORESOURCE_BUS;
92
93 return 0;
94}
95EXPORT_SYMBOL_GPL(of_pci_parse_bus_range);
Thomas Petazzoni0d5a6db2013-08-09 22:27:09 +020096
Liviu Dudau41e5c0f2014-09-29 15:29:27 +010097/**
98 * This function will try to obtain the host bridge domain number by
99 * finding a property called "linux,pci-domain" of the given device node.
100 *
101 * @node: device tree node with the domain information
102 *
103 * Returns the associated domain number from DT in the range [0-0xffff], or
104 * a negative value if the required property is not found.
105 */
106int of_get_pci_domain_nr(struct device_node *node)
107{
108 const __be32 *value;
109 int len;
110 u16 domain;
111
112 value = of_get_property(node, "linux,pci-domain", &len);
113 if (!value || len < sizeof(*value))
114 return -EINVAL;
115
116 domain = (u16)be32_to_cpup(value);
117
118 return domain;
119}
120EXPORT_SYMBOL_GPL(of_get_pci_domain_nr);
121
Murali Karicheric49b8fc2015-03-03 12:52:12 -0500122/**
Marc Zyngierf81c11a2015-09-04 17:50:08 +0100123 * of_pci_check_probe_only - Setup probe only mode if linux,pci-probe-only
124 * is present and valid
125 */
126void of_pci_check_probe_only(void)
127{
128 u32 val;
129 int ret;
130
131 ret = of_property_read_u32(of_chosen, "linux,pci-probe-only", &val);
132 if (ret) {
133 if (ret == -ENODATA || ret == -EOVERFLOW)
134 pr_warn("linux,pci-probe-only without valid value, ignoring\n");
135 return;
136 }
137
138 if (val)
139 pci_add_flags(PCI_PROBE_ONLY);
140 else
141 pci_clear_flags(PCI_PROBE_ONLY);
142
Rob Herring606ad422016-06-15 08:32:18 -0500143 pr_info("PROBE_ONLY %sabled\n", val ? "en" : "dis");
Marc Zyngierf81c11a2015-09-04 17:50:08 +0100144}
145EXPORT_SYMBOL_GPL(of_pci_check_probe_only);
146
Liviu Dudaucbe40972014-09-29 15:29:28 +0100147#if defined(CONFIG_OF_ADDRESS)
148/**
149 * of_pci_get_host_bridge_resources - Parse PCI host bridge resources from DT
150 * @dev: device node of the host bridge having the range property
151 * @busno: bus number associated with the bridge root bus
152 * @bus_max: maximum number of buses for this bridge
153 * @resources: list where the range of resources will be added after DT parsing
154 * @io_base: pointer to a variable that will contain on return the physical
155 * address for the start of the I/O range. Can be NULL if the caller doesn't
156 * expect IO ranges to be present in the device tree.
157 *
158 * It is the caller's job to free the @resources list.
159 *
160 * This function will parse the "ranges" property of a PCI host bridge device
161 * node and setup the resource mapping based on its content. It is expected
162 * that the property conforms with the Power ePAPR document.
163 *
164 * It returns zero if the range parsing has been successful or a standard error
165 * value if it failed.
166 */
167int of_pci_get_host_bridge_resources(struct device_node *dev,
168 unsigned char busno, unsigned char bus_max,
169 struct list_head *resources, resource_size_t *io_base)
170{
Rafael J. Wysocki5c493df2015-02-09 15:40:30 +0100171 struct resource_entry *window;
Liviu Dudaucbe40972014-09-29 15:29:28 +0100172 struct resource *res;
173 struct resource *bus_range;
174 struct of_pci_range range;
175 struct of_pci_range_parser parser;
176 char range_type[4];
177 int err;
178
179 if (io_base)
180 *io_base = (resource_size_t)OF_BAD_ADDR;
181
182 bus_range = kzalloc(sizeof(*bus_range), GFP_KERNEL);
183 if (!bus_range)
184 return -ENOMEM;
185
Rob Herring606ad422016-06-15 08:32:18 -0500186 pr_info("host bridge %s ranges:\n", dev->full_name);
Liviu Dudaucbe40972014-09-29 15:29:28 +0100187
188 err = of_pci_parse_bus_range(dev, bus_range);
189 if (err) {
190 bus_range->start = busno;
191 bus_range->end = bus_max;
192 bus_range->flags = IORESOURCE_BUS;
193 pr_info(" No bus range found for %s, using %pR\n",
194 dev->full_name, bus_range);
195 } else {
196 if (bus_range->end > bus_range->start + bus_max)
197 bus_range->end = bus_range->start + bus_max;
198 }
199 pci_add_resource(resources, bus_range);
200
201 /* Check for ranges property */
202 err = of_pci_range_parser_init(&parser, dev);
203 if (err)
204 goto parse_failed;
205
206 pr_debug("Parsing ranges property...\n");
207 for_each_of_pci_range(&parser, &range) {
208 /* Read next ranges element */
209 if ((range.flags & IORESOURCE_TYPE_BITS) == IORESOURCE_IO)
210 snprintf(range_type, 4, " IO");
211 else if ((range.flags & IORESOURCE_TYPE_BITS) == IORESOURCE_MEM)
212 snprintf(range_type, 4, "MEM");
213 else
214 snprintf(range_type, 4, "err");
215 pr_info(" %s %#010llx..%#010llx -> %#010llx\n", range_type,
216 range.cpu_addr, range.cpu_addr + range.size - 1,
217 range.pci_addr);
218
219 /*
220 * If we failed translation or got a zero-sized region
221 * then skip this range
222 */
223 if (range.cpu_addr == OF_BAD_ADDR || range.size == 0)
224 continue;
225
226 res = kzalloc(sizeof(struct resource), GFP_KERNEL);
227 if (!res) {
228 err = -ENOMEM;
229 goto parse_failed;
230 }
231
232 err = of_pci_range_to_resource(&range, dev, res);
Pavel Fedinf134f252015-10-08 10:24:26 +0300233 if (err) {
234 kfree(res);
235 continue;
236 }
Liviu Dudaucbe40972014-09-29 15:29:28 +0100237
238 if (resource_type(res) == IORESOURCE_IO) {
239 if (!io_base) {
240 pr_err("I/O range found for %s. Please provide an io_base pointer to save CPU base address\n",
241 dev->full_name);
242 err = -EINVAL;
243 goto conversion_failed;
244 }
245 if (*io_base != (resource_size_t)OF_BAD_ADDR)
246 pr_warn("More than one I/O resource converted for %s. CPU base address for old range lost!\n",
247 dev->full_name);
248 *io_base = range.cpu_addr;
249 }
250
251 pci_add_resource_offset(resources, res, res->start - range.pci_addr);
252 }
253
254 return 0;
255
256conversion_failed:
257 kfree(res);
258parse_failed:
Rafael J. Wysocki5c493df2015-02-09 15:40:30 +0100259 resource_list_for_each_entry(window, resources)
Lorenzo Pieralisid2be00c2015-01-27 18:01:45 +0000260 kfree(window->res);
Liviu Dudaucbe40972014-09-29 15:29:28 +0100261 pci_free_resource_list(resources);
262 return err;
263}
264EXPORT_SYMBOL_GPL(of_pci_get_host_bridge_resources);
265#endif /* CONFIG_OF_ADDRESS */
266
Thomas Petazzoni0d5a6db2013-08-09 22:27:09 +0200267#ifdef CONFIG_PCI_MSI
268
269static LIST_HEAD(of_pci_msi_chip_list);
270static DEFINE_MUTEX(of_pci_msi_chip_mutex);
271
Yijing Wangc2791b82014-11-11 17:45:45 -0700272int of_pci_msi_chip_add(struct msi_controller *chip)
Thomas Petazzoni0d5a6db2013-08-09 22:27:09 +0200273{
274 if (!of_property_read_bool(chip->of_node, "msi-controller"))
275 return -EINVAL;
276
277 mutex_lock(&of_pci_msi_chip_mutex);
278 list_add(&chip->list, &of_pci_msi_chip_list);
279 mutex_unlock(&of_pci_msi_chip_mutex);
280
281 return 0;
282}
283EXPORT_SYMBOL_GPL(of_pci_msi_chip_add);
284
Yijing Wangc2791b82014-11-11 17:45:45 -0700285void of_pci_msi_chip_remove(struct msi_controller *chip)
Thomas Petazzoni0d5a6db2013-08-09 22:27:09 +0200286{
287 mutex_lock(&of_pci_msi_chip_mutex);
288 list_del(&chip->list);
289 mutex_unlock(&of_pci_msi_chip_mutex);
290}
291EXPORT_SYMBOL_GPL(of_pci_msi_chip_remove);
292
Yijing Wangc2791b82014-11-11 17:45:45 -0700293struct msi_controller *of_pci_find_msi_chip_by_node(struct device_node *of_node)
Thomas Petazzoni0d5a6db2013-08-09 22:27:09 +0200294{
Yijing Wangc2791b82014-11-11 17:45:45 -0700295 struct msi_controller *c;
Thomas Petazzoni0d5a6db2013-08-09 22:27:09 +0200296
297 mutex_lock(&of_pci_msi_chip_mutex);
298 list_for_each_entry(c, &of_pci_msi_chip_list, list) {
299 if (c->of_node == of_node) {
300 mutex_unlock(&of_pci_msi_chip_mutex);
301 return c;
302 }
303 }
304 mutex_unlock(&of_pci_msi_chip_mutex);
305
306 return NULL;
307}
308EXPORT_SYMBOL_GPL(of_pci_find_msi_chip_by_node);
309
310#endif /* CONFIG_PCI_MSI */