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99fd133f GL |
1 | /* |
2 | * V4L2 OF binding parsing library | |
3 | * | |
4 | * Copyright (C) 2012 - 2013 Samsung Electronics Co., Ltd. | |
c6e8d96d | 5 | * Author: Sylwester Nawrocki <s.nawrocki@samsung.com> |
99fd133f GL |
6 | * |
7 | * Copyright (C) 2012 Renesas Electronics Corp. | |
8 | * Author: Guennadi Liakhovetski <g.liakhovetski@gmx.de> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of version 2 of the GNU General Public License as | |
12 | * published by the Free Software Foundation. | |
13 | */ | |
14 | #include <linux/kernel.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/of.h> | |
698da18e | 17 | #include <linux/slab.h> |
99fd133f GL |
18 | #include <linux/string.h> |
19 | #include <linux/types.h> | |
20 | ||
21 | #include <media/v4l2-of.h> | |
22 | ||
b6eec1c4 SA |
23 | static int v4l2_of_parse_csi_bus(const struct device_node *node, |
24 | struct v4l2_of_endpoint *endpoint) | |
99fd133f GL |
25 | { |
26 | struct v4l2_of_bus_mipi_csi2 *bus = &endpoint->bus.mipi_csi2; | |
99fd133f GL |
27 | struct property *prop; |
28 | bool have_clk_lane = false; | |
29 | unsigned int flags = 0; | |
30 | u32 v; | |
31 | ||
32 | prop = of_find_property(node, "data-lanes", NULL); | |
33 | if (prop) { | |
34 | const __be32 *lane = NULL; | |
b6eec1c4 | 35 | unsigned int i; |
99fd133f | 36 | |
b6eec1c4 SA |
37 | for (i = 0; i < ARRAY_SIZE(bus->data_lanes); i++) { |
38 | lane = of_prop_next_u32(prop, lane, &v); | |
99fd133f GL |
39 | if (!lane) |
40 | break; | |
b6eec1c4 | 41 | bus->data_lanes[i] = v; |
99fd133f GL |
42 | } |
43 | bus->num_data_lanes = i; | |
b6eec1c4 SA |
44 | } |
45 | ||
46 | prop = of_find_property(node, "lane-polarities", NULL); | |
47 | if (prop) { | |
48 | const __be32 *polarity = NULL; | |
49 | unsigned int i; | |
50 | ||
51 | for (i = 0; i < ARRAY_SIZE(bus->lane_polarities); i++) { | |
52 | polarity = of_prop_next_u32(prop, polarity, &v); | |
53 | if (!polarity) | |
54 | break; | |
55 | bus->lane_polarities[i] = v; | |
56 | } | |
57 | ||
58 | if (i < 1 + bus->num_data_lanes /* clock + data */) { | |
59 | pr_warn("%s: too few lane-polarities entries (need %u, got %u)\n", | |
60 | node->full_name, 1 + bus->num_data_lanes, i); | |
61 | return -EINVAL; | |
62 | } | |
99fd133f GL |
63 | } |
64 | ||
65 | if (!of_property_read_u32(node, "clock-lanes", &v)) { | |
66 | bus->clock_lane = v; | |
67 | have_clk_lane = true; | |
68 | } | |
69 | ||
70 | if (of_get_property(node, "clock-noncontinuous", &v)) | |
71 | flags |= V4L2_MBUS_CSI2_NONCONTINUOUS_CLOCK; | |
72 | else if (have_clk_lane || bus->num_data_lanes > 0) | |
73 | flags |= V4L2_MBUS_CSI2_CONTINUOUS_CLOCK; | |
74 | ||
75 | bus->flags = flags; | |
76 | endpoint->bus_type = V4L2_MBUS_CSI2; | |
b6eec1c4 SA |
77 | |
78 | return 0; | |
99fd133f GL |
79 | } |
80 | ||
81 | static void v4l2_of_parse_parallel_bus(const struct device_node *node, | |
82 | struct v4l2_of_endpoint *endpoint) | |
83 | { | |
84 | struct v4l2_of_bus_parallel *bus = &endpoint->bus.parallel; | |
85 | unsigned int flags = 0; | |
86 | u32 v; | |
87 | ||
88 | if (!of_property_read_u32(node, "hsync-active", &v)) | |
89 | flags |= v ? V4L2_MBUS_HSYNC_ACTIVE_HIGH : | |
90 | V4L2_MBUS_HSYNC_ACTIVE_LOW; | |
91 | ||
92 | if (!of_property_read_u32(node, "vsync-active", &v)) | |
93 | flags |= v ? V4L2_MBUS_VSYNC_ACTIVE_HIGH : | |
94 | V4L2_MBUS_VSYNC_ACTIVE_LOW; | |
95 | ||
96 | if (!of_property_read_u32(node, "pclk-sample", &v)) | |
97 | flags |= v ? V4L2_MBUS_PCLK_SAMPLE_RISING : | |
98 | V4L2_MBUS_PCLK_SAMPLE_FALLING; | |
99 | ||
100 | if (!of_property_read_u32(node, "field-even-active", &v)) | |
101 | flags |= v ? V4L2_MBUS_FIELD_EVEN_HIGH : | |
102 | V4L2_MBUS_FIELD_EVEN_LOW; | |
103 | if (flags) | |
104 | endpoint->bus_type = V4L2_MBUS_PARALLEL; | |
105 | else | |
106 | endpoint->bus_type = V4L2_MBUS_BT656; | |
107 | ||
108 | if (!of_property_read_u32(node, "data-active", &v)) | |
109 | flags |= v ? V4L2_MBUS_DATA_ACTIVE_HIGH : | |
110 | V4L2_MBUS_DATA_ACTIVE_LOW; | |
111 | ||
112 | if (of_get_property(node, "slave-mode", &v)) | |
113 | flags |= V4L2_MBUS_SLAVE; | |
114 | else | |
115 | flags |= V4L2_MBUS_MASTER; | |
116 | ||
117 | if (!of_property_read_u32(node, "bus-width", &v)) | |
118 | bus->bus_width = v; | |
119 | ||
120 | if (!of_property_read_u32(node, "data-shift", &v)) | |
121 | bus->data_shift = v; | |
122 | ||
d1d70aa6 LP |
123 | if (!of_property_read_u32(node, "sync-on-green-active", &v)) |
124 | flags |= v ? V4L2_MBUS_VIDEO_SOG_ACTIVE_HIGH : | |
125 | V4L2_MBUS_VIDEO_SOG_ACTIVE_LOW; | |
126 | ||
99fd133f GL |
127 | bus->flags = flags; |
128 | ||
129 | } | |
99fd133f GL |
130 | |
131 | /** | |
132 | * v4l2_of_parse_endpoint() - parse all endpoint node properties | |
133 | * @node: pointer to endpoint device_node | |
134 | * @endpoint: pointer to the V4L2 OF endpoint data structure | |
135 | * | |
136 | * All properties are optional. If none are found, we don't set any flags. | |
137 | * This means the port has a static configuration and no properties have | |
138 | * to be specified explicitly. | |
139 | * If any properties that identify the bus as parallel are found and | |
140 | * slave-mode isn't set, we set V4L2_MBUS_MASTER. Similarly, if we recognise | |
141 | * the bus as serial CSI-2 and clock-noncontinuous isn't set, we set the | |
142 | * V4L2_MBUS_CSI2_CONTINUOUS_CLOCK flag. | |
143 | * The caller should hold a reference to @node. | |
9ff889b6 | 144 | * |
698da18e SA |
145 | * NOTE: This function does not parse properties the size of which is |
146 | * variable without a low fixed limit. Please use | |
147 | * v4l2_of_alloc_parse_endpoint() in new drivers instead. | |
148 | * | |
9ff889b6 | 149 | * Return: 0. |
99fd133f | 150 | */ |
9ff889b6 LP |
151 | int v4l2_of_parse_endpoint(const struct device_node *node, |
152 | struct v4l2_of_endpoint *endpoint) | |
99fd133f | 153 | { |
b6eec1c4 SA |
154 | int rval; |
155 | ||
f2a575f6 | 156 | of_graph_parse_endpoint(node, &endpoint->base); |
161aadae SA |
157 | /* Zero fields from bus_type to until the end */ |
158 | memset(&endpoint->bus_type, 0, sizeof(*endpoint) - | |
159 | offsetof(typeof(*endpoint), bus_type)); | |
99fd133f | 160 | |
b6eec1c4 SA |
161 | rval = v4l2_of_parse_csi_bus(node, endpoint); |
162 | if (rval) | |
163 | return rval; | |
99fd133f GL |
164 | /* |
165 | * Parse the parallel video bus properties only if none | |
166 | * of the MIPI CSI-2 specific properties were found. | |
167 | */ | |
168 | if (endpoint->bus.mipi_csi2.flags == 0) | |
169 | v4l2_of_parse_parallel_bus(node, endpoint); | |
170 | ||
9ff889b6 | 171 | return 0; |
99fd133f GL |
172 | } |
173 | EXPORT_SYMBOL(v4l2_of_parse_endpoint); | |
c9bca8b3 | 174 | |
698da18e SA |
175 | /* |
176 | * v4l2_of_free_endpoint() - free the endpoint acquired by | |
177 | * v4l2_of_alloc_parse_endpoint() | |
178 | * @endpoint - the endpoint the resources of which are to be released | |
179 | * | |
180 | * It is safe to call this function with NULL argument or on an | |
181 | * endpoint the parsing of which failed. | |
182 | */ | |
183 | void v4l2_of_free_endpoint(struct v4l2_of_endpoint *endpoint) | |
184 | { | |
185 | if (IS_ERR_OR_NULL(endpoint)) | |
186 | return; | |
187 | ||
188 | kfree(endpoint->link_frequencies); | |
189 | kfree(endpoint); | |
190 | } | |
191 | EXPORT_SYMBOL(v4l2_of_free_endpoint); | |
192 | ||
193 | /** | |
194 | * v4l2_of_alloc_parse_endpoint() - parse all endpoint node properties | |
195 | * @node: pointer to endpoint device_node | |
196 | * | |
197 | * All properties are optional. If none are found, we don't set any flags. | |
198 | * This means the port has a static configuration and no properties have | |
199 | * to be specified explicitly. | |
200 | * If any properties that identify the bus as parallel are found and | |
201 | * slave-mode isn't set, we set V4L2_MBUS_MASTER. Similarly, if we recognise | |
202 | * the bus as serial CSI-2 and clock-noncontinuous isn't set, we set the | |
203 | * V4L2_MBUS_CSI2_CONTINUOUS_CLOCK flag. | |
204 | * The caller should hold a reference to @node. | |
205 | * | |
206 | * v4l2_of_alloc_parse_endpoint() has two important differences to | |
207 | * v4l2_of_parse_endpoint(): | |
208 | * | |
209 | * 1. It also parses variable size data and | |
210 | * | |
211 | * 2. The memory it has allocated to store the variable size data must | |
212 | * be freed using v4l2_of_free_endpoint() when no longer needed. | |
213 | * | |
214 | * Return: Pointer to v4l2_of_endpoint if successful, on error a | |
215 | * negative error code. | |
216 | */ | |
217 | struct v4l2_of_endpoint *v4l2_of_alloc_parse_endpoint( | |
218 | const struct device_node *node) | |
219 | { | |
220 | struct v4l2_of_endpoint *endpoint; | |
221 | int len; | |
222 | int rval; | |
223 | ||
224 | endpoint = kzalloc(sizeof(*endpoint), GFP_KERNEL); | |
225 | if (!endpoint) | |
226 | return ERR_PTR(-ENOMEM); | |
227 | ||
228 | rval = v4l2_of_parse_endpoint(node, endpoint); | |
229 | if (rval < 0) | |
230 | goto out_err; | |
231 | ||
232 | if (of_get_property(node, "link-frequencies", &len)) { | |
233 | endpoint->link_frequencies = kmalloc(len, GFP_KERNEL); | |
234 | if (!endpoint->link_frequencies) { | |
235 | rval = -ENOMEM; | |
236 | goto out_err; | |
237 | } | |
238 | ||
239 | endpoint->nr_of_link_frequencies = | |
240 | len / sizeof(*endpoint->link_frequencies); | |
241 | ||
242 | rval = of_property_read_u64_array( | |
243 | node, "link-frequencies", endpoint->link_frequencies, | |
244 | endpoint->nr_of_link_frequencies); | |
245 | if (rval < 0) | |
246 | goto out_err; | |
247 | } | |
248 | ||
249 | return endpoint; | |
250 | ||
251 | out_err: | |
252 | v4l2_of_free_endpoint(endpoint); | |
253 | return ERR_PTR(rval); | |
254 | } | |
255 | EXPORT_SYMBOL(v4l2_of_alloc_parse_endpoint); | |
256 | ||
c9bca8b3 LP |
257 | /** |
258 | * v4l2_of_parse_link() - parse a link between two endpoints | |
259 | * @node: pointer to the endpoint at the local end of the link | |
260 | * @link: pointer to the V4L2 OF link data structure | |
261 | * | |
262 | * Fill the link structure with the local and remote nodes and port numbers. | |
263 | * The local_node and remote_node fields are set to point to the local and | |
264 | * remote port's parent nodes respectively (the port parent node being the | |
265 | * parent node of the port node if that node isn't a 'ports' node, or the | |
266 | * grand-parent node of the port node otherwise). | |
267 | * | |
268 | * A reference is taken to both the local and remote nodes, the caller must use | |
269 | * v4l2_of_put_link() to drop the references when done with the link. | |
270 | * | |
271 | * Return: 0 on success, or -ENOLINK if the remote endpoint can't be found. | |
272 | */ | |
273 | int v4l2_of_parse_link(const struct device_node *node, | |
274 | struct v4l2_of_link *link) | |
275 | { | |
276 | struct device_node *np; | |
277 | ||
278 | memset(link, 0, sizeof(*link)); | |
279 | ||
280 | np = of_get_parent(node); | |
281 | of_property_read_u32(np, "reg", &link->local_port); | |
282 | np = of_get_next_parent(np); | |
283 | if (of_node_cmp(np->name, "ports") == 0) | |
284 | np = of_get_next_parent(np); | |
285 | link->local_node = np; | |
286 | ||
287 | np = of_parse_phandle(node, "remote-endpoint", 0); | |
288 | if (!np) { | |
289 | of_node_put(link->local_node); | |
290 | return -ENOLINK; | |
291 | } | |
292 | ||
293 | np = of_get_parent(np); | |
294 | of_property_read_u32(np, "reg", &link->remote_port); | |
295 | np = of_get_next_parent(np); | |
296 | if (of_node_cmp(np->name, "ports") == 0) | |
297 | np = of_get_next_parent(np); | |
298 | link->remote_node = np; | |
299 | ||
300 | return 0; | |
301 | } | |
302 | EXPORT_SYMBOL(v4l2_of_parse_link); | |
303 | ||
304 | /** | |
305 | * v4l2_of_put_link() - drop references to nodes in a link | |
306 | * @link: pointer to the V4L2 OF link data structure | |
307 | * | |
308 | * Drop references to the local and remote nodes in the link. This function must | |
309 | * be called on every link parsed with v4l2_of_parse_link(). | |
310 | */ | |
311 | void v4l2_of_put_link(struct v4l2_of_link *link) | |
312 | { | |
313 | of_node_put(link->local_node); | |
314 | of_node_put(link->remote_node); | |
315 | } | |
316 | EXPORT_SYMBOL(v4l2_of_put_link); |