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1/*
2 * Copyright (C) 2014 Texas Instruments
3 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 as published by
7 * the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program. If not, see <http://www.gnu.org/licenses/>.
16 */
17
18/*
19 * As omapdss panel drivers are omapdss specific, but we want to define the
20 * DT-data in generic manner, we convert the compatible strings of the panel and
21 * encoder nodes from "panel-foo" to "omapdss,panel-foo". This way we can have
22 * both correct DT data and omapdss specific drivers.
23 *
24 * When we get generic panel drivers to the kernel, this file will be removed.
25 */
26
27#include <linux/kernel.h>
28#include <linux/of.h>
29#include <linux/of_graph.h>
30#include <linux/slab.h>
31#include <linux/list.h>
32
33static struct list_head dss_conv_list __initdata;
34
35static const char prefix[] __initconst = "omapdss,";
36
37struct dss_conv_node {
38 struct list_head list;
39 struct device_node *node;
40 bool root;
41};
42
43static int __init omapdss_count_strings(const struct property *prop)
44{
45 const char *p = prop->value;
46 int l = 0, total = 0;
47 int i;
48
49 for (i = 0; total < prop->length; total += l, p += l, i++)
50 l = strlen(p) + 1;
51
52 return i;
53}
54
55static void __init omapdss_update_prop(struct device_node *node, char *compat,
56 int len)
57{
58 struct property *prop;
59
60 prop = kzalloc(sizeof(*prop), GFP_KERNEL);
61 if (!prop)
62 return;
63
64 prop->name = "compatible";
65 prop->value = compat;
66 prop->length = len;
67
68 of_update_property(node, prop);
69}
70
71static void __init omapdss_prefix_strcpy(char *dst, int dst_len,
72 const char *src, int src_len)
73{
74 size_t total = 0;
75
76 while (total < src_len) {
77 size_t l = strlen(src) + 1;
78
79 strcpy(dst, prefix);
80 dst += strlen(prefix);
81
82 strcpy(dst, src);
83 dst += l;
84
85 src += l;
86 total += l;
87 }
88}
89
90/* prepend compatible property strings with "omapdss," */
91static void __init omapdss_omapify_node(struct device_node *node)
92{
93 struct property *prop;
94 char *new_compat;
95 int num_strs;
96 int new_len;
97
98 prop = of_find_property(node, "compatible", NULL);
99
100 if (!prop || !prop->value)
101 return;
102
103 if (strnlen(prop->value, prop->length) >= prop->length)
104 return;
105
106 /* is it already prefixed? */
107 if (strncmp(prefix, prop->value, strlen(prefix)) == 0)
108 return;
109
110 num_strs = omapdss_count_strings(prop);
111
112 new_len = prop->length + strlen(prefix) * num_strs;
113 new_compat = kmalloc(new_len, GFP_KERNEL);
114
115 omapdss_prefix_strcpy(new_compat, new_len, prop->value, prop->length);
116
117 omapdss_update_prop(node, new_compat, new_len);
118}
119
120static void __init omapdss_add_to_list(struct device_node *node, bool root)
121{
122 struct dss_conv_node *n = kmalloc(sizeof(struct dss_conv_node),
123 GFP_KERNEL);
124 if (n) {
125 n->node = node;
126 n->root = root;
127 list_add(&n->list, &dss_conv_list);
128 }
129}
130
131static bool __init omapdss_list_contains(const struct device_node *node)
132{
133 struct dss_conv_node *n;
134
135 list_for_each_entry(n, &dss_conv_list, list) {
136 if (n->node == node)
137 return true;
138 }
139
140 return false;
141}
142
143static void __init omapdss_walk_device(struct device_node *node, bool root)
144{
145 struct device_node *n;
146
147 omapdss_add_to_list(node, root);
148
149 /*
150 * of_graph_get_remote_port_parent() prints an error if there is no
151 * port/ports node. To avoid that, check first that there's the node.
152 */
153 n = of_get_child_by_name(node, "ports");
154 if (!n)
155 n = of_get_child_by_name(node, "port");
156 if (!n)
157 return;
158
159 of_node_put(n);
160
161 n = NULL;
162 while ((n = of_graph_get_next_endpoint(node, n)) != NULL) {
163 struct device_node *pn;
164
165 pn = of_graph_get_remote_port_parent(n);
166
167 if (!pn)
168 continue;
169
170 if (!of_device_is_available(pn) || omapdss_list_contains(pn)) {
171 of_node_put(pn);
172 continue;
173 }
174
175 omapdss_walk_device(pn, false);
176 }
177}
178
179static const struct of_device_id omapdss_of_match[] __initconst = {
180 { .compatible = "ti,omap2-dss", },
181 { .compatible = "ti,omap3-dss", },
182 { .compatible = "ti,omap4-dss", },
183 { .compatible = "ti,omap5-dss", },
184 { .compatible = "ti,dra7-dss", },
185 {},
186};
187
188static int __init omapdss_boot_init(void)
189{
190 struct device_node *dss, *child;
191
192 INIT_LIST_HEAD(&dss_conv_list);
193
194 dss = of_find_matching_node(NULL, omapdss_of_match);
195
196 if (dss == NULL || !of_device_is_available(dss))
197 return 0;
198
199 omapdss_walk_device(dss, true);
200
201 for_each_available_child_of_node(dss, child) {
202 if (!of_find_property(child, "compatible", NULL))
203 continue;
204
205 omapdss_walk_device(child, true);
206 }
207
208 while (!list_empty(&dss_conv_list)) {
209 struct dss_conv_node *n;
210
211 n = list_first_entry(&dss_conv_list, struct dss_conv_node,
212 list);
213
214 if (!n->root)
215 omapdss_omapify_node(n->node);
216
217 list_del(&n->list);
218 of_node_put(n->node);
219 kfree(n);
220 }
221
222 return 0;
223}
224
225subsys_initcall(omapdss_boot_init);
1/*
2 * Copyright (C) 2014 Texas Instruments
3 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 as published by
7 * the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program. If not, see <http://www.gnu.org/licenses/>.
16 */
17
18/*
19 * As omapdss panel drivers are omapdss specific, but we want to define the
20 * DT-data in generic manner, we convert the compatible strings of the panel and
21 * encoder nodes from "panel-foo" to "omapdss,panel-foo". This way we can have
22 * both correct DT data and omapdss specific drivers.
23 *
24 * When we get generic panel drivers to the kernel, this file will be removed.
25 */
26
27#include <linux/kernel.h>
28#include <linux/of.h>
29#include <linux/of_graph.h>
30#include <linux/slab.h>
31#include <linux/list.h>
32
33static struct list_head dss_conv_list __initdata;
34
35static const char prefix[] __initconst = "omapdss,";
36
37struct dss_conv_node {
38 struct list_head list;
39 struct device_node *node;
40 bool root;
41};
42
43static int __init omapdss_count_strings(const struct property *prop)
44{
45 const char *p = prop->value;
46 int l = 0, total = 0;
47 int i;
48
49 for (i = 0; total < prop->length; total += l, p += l, i++)
50 l = strlen(p) + 1;
51
52 return i;
53}
54
55static void __init omapdss_update_prop(struct device_node *node, char *compat,
56 int len)
57{
58 struct property *prop;
59
60 prop = kzalloc(sizeof(*prop), GFP_KERNEL);
61 if (!prop)
62 return;
63
64 prop->name = "compatible";
65 prop->value = compat;
66 prop->length = len;
67
68 of_update_property(node, prop);
69}
70
71static void __init omapdss_prefix_strcpy(char *dst, int dst_len,
72 const char *src, int src_len)
73{
74 size_t total = 0;
75
76 while (total < src_len) {
77 size_t l = strlen(src) + 1;
78
79 strcpy(dst, prefix);
80 dst += strlen(prefix);
81
82 strcpy(dst, src);
83 dst += l;
84
85 src += l;
86 total += l;
87 }
88}
89
90/* prepend compatible property strings with "omapdss," */
91static void __init omapdss_omapify_node(struct device_node *node)
92{
93 struct property *prop;
94 char *new_compat;
95 int num_strs;
96 int new_len;
97
98 prop = of_find_property(node, "compatible", NULL);
99
100 if (!prop || !prop->value)
101 return;
102
103 if (strnlen(prop->value, prop->length) >= prop->length)
104 return;
105
106 /* is it already prefixed? */
107 if (strncmp(prefix, prop->value, strlen(prefix)) == 0)
108 return;
109
110 num_strs = omapdss_count_strings(prop);
111
112 new_len = prop->length + strlen(prefix) * num_strs;
113 new_compat = kmalloc(new_len, GFP_KERNEL);
114
115 omapdss_prefix_strcpy(new_compat, new_len, prop->value, prop->length);
116
117 omapdss_update_prop(node, new_compat, new_len);
118}
119
120static void __init omapdss_add_to_list(struct device_node *node, bool root)
121{
122 struct dss_conv_node *n = kmalloc(sizeof(struct dss_conv_node),
123 GFP_KERNEL);
124 if (n) {
125 n->node = node;
126 n->root = root;
127 list_add(&n->list, &dss_conv_list);
128 }
129}
130
131static bool __init omapdss_list_contains(const struct device_node *node)
132{
133 struct dss_conv_node *n;
134
135 list_for_each_entry(n, &dss_conv_list, list) {
136 if (n->node == node)
137 return true;
138 }
139
140 return false;
141}
142
143static void __init omapdss_walk_device(struct device_node *node, bool root)
144{
145 struct device_node *n;
146
147 omapdss_add_to_list(node, root);
148
149 /*
150 * of_graph_get_remote_port_parent() prints an error if there is no
151 * port/ports node. To avoid that, check first that there's the node.
152 */
153 n = of_get_child_by_name(node, "ports");
154 if (!n)
155 n = of_get_child_by_name(node, "port");
156 if (!n)
157 return;
158
159 of_node_put(n);
160
161 n = NULL;
162 while ((n = of_graph_get_next_endpoint(node, n)) != NULL) {
163 struct device_node *pn;
164
165 pn = of_graph_get_remote_port_parent(n);
166
167 if (!pn)
168 continue;
169
170 if (!of_device_is_available(pn) || omapdss_list_contains(pn)) {
171 of_node_put(pn);
172 continue;
173 }
174
175 omapdss_walk_device(pn, false);
176 }
177}
178
179static const struct of_device_id omapdss_of_match[] __initconst = {
180 { .compatible = "ti,omap2-dss", },
181 { .compatible = "ti,omap3-dss", },
182 { .compatible = "ti,omap4-dss", },
183 { .compatible = "ti,omap5-dss", },
184 { .compatible = "ti,dra7-dss", },
185 {},
186};
187
188static int __init omapdss_boot_init(void)
189{
190 struct device_node *dss, *child;
191
192 INIT_LIST_HEAD(&dss_conv_list);
193
194 dss = of_find_matching_node(NULL, omapdss_of_match);
195
196 if (dss == NULL || !of_device_is_available(dss))
197 return 0;
198
199 omapdss_walk_device(dss, true);
200
201 for_each_available_child_of_node(dss, child) {
202 if (!of_find_property(child, "compatible", NULL))
203 continue;
204
205 omapdss_walk_device(child, true);
206 }
207
208 while (!list_empty(&dss_conv_list)) {
209 struct dss_conv_node *n;
210
211 n = list_first_entry(&dss_conv_list, struct dss_conv_node,
212 list);
213
214 if (!n->root)
215 omapdss_omapify_node(n->node);
216
217 list_del(&n->list);
218 of_node_put(n->node);
219 kfree(n);
220 }
221
222 return 0;
223}
224
225subsys_initcall(omapdss_boot_init);