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d90a5a30 MY |
1 | /* |
2 | * Copyright (C) 2015 Masahiro Yamada <yamada.masahiro@socionext.com> | |
3 | * | |
4 | * SPDX-License-Identifier: GPL-2.0+ | |
5 | */ | |
6 | ||
7 | #include <common.h> | |
8 | #include <libfdt.h> | |
9 | #include <linux/err.h> | |
10 | #include <linux/list.h> | |
11 | #include <dm/device.h> | |
12 | #include <dm/lists.h> | |
13 | #include <dm/pinctrl.h> | |
14 | #include <dm/uclass.h> | |
15 | ||
16 | DECLARE_GLOBAL_DATA_PTR; | |
17 | ||
18 | #if CONFIG_IS_ENABLED(PINCTRL_FULL) | |
19 | /** | |
20 | * pinctrl_config_one() - apply pinctrl settings for a single node | |
21 | * | |
22 | * @config: pin configuration node | |
23 | * @return: 0 on success, or negative error code on failure | |
24 | */ | |
25 | static int pinctrl_config_one(struct udevice *config) | |
26 | { | |
27 | struct udevice *pctldev; | |
28 | const struct pinctrl_ops *ops; | |
29 | ||
30 | pctldev = config; | |
31 | for (;;) { | |
32 | pctldev = dev_get_parent(pctldev); | |
33 | if (!pctldev) { | |
34 | dev_err(config, "could not find pctldev\n"); | |
35 | return -EINVAL; | |
36 | } | |
37 | if (pctldev->uclass->uc_drv->id == UCLASS_PINCTRL) | |
38 | break; | |
39 | } | |
40 | ||
41 | ops = pinctrl_get_ops(pctldev); | |
42 | return ops->set_state(pctldev, config); | |
43 | } | |
44 | ||
45 | /** | |
46 | * pinctrl_select_state_full() - full implementation of pinctrl_select_state | |
47 | * | |
48 | * @dev: peripheral device | |
49 | * @statename: state name, like "default" | |
50 | * @return: 0 on success, or negative error code on failure | |
51 | */ | |
52 | static int pinctrl_select_state_full(struct udevice *dev, const char *statename) | |
53 | { | |
54 | const void *fdt = gd->fdt_blob; | |
55 | int node = dev->of_offset; | |
56 | char propname[32]; /* long enough */ | |
57 | const fdt32_t *list; | |
58 | uint32_t phandle; | |
59 | int config_node; | |
60 | struct udevice *config; | |
61 | int state, size, i, ret; | |
62 | ||
63 | state = fdt_find_string(fdt, node, "pinctrl-names", statename); | |
64 | if (state < 0) { | |
65 | char *end; | |
66 | /* | |
67 | * If statename is not found in "pinctrl-names", | |
68 | * assume statename is just the integer state ID. | |
69 | */ | |
70 | state = simple_strtoul(statename, &end, 10); | |
71 | if (*end) | |
72 | return -EINVAL; | |
73 | } | |
74 | ||
75 | snprintf(propname, sizeof(propname), "pinctrl-%d", state); | |
76 | list = fdt_getprop(fdt, node, propname, &size); | |
77 | if (!list) | |
78 | return -EINVAL; | |
79 | ||
80 | size /= sizeof(*list); | |
81 | for (i = 0; i < size; i++) { | |
82 | phandle = fdt32_to_cpu(*list++); | |
83 | ||
84 | config_node = fdt_node_offset_by_phandle(fdt, phandle); | |
85 | if (config_node < 0) { | |
86 | dev_err(dev, "prop %s index %d invalid phandle\n", | |
87 | propname, i); | |
88 | return -EINVAL; | |
89 | } | |
90 | ret = uclass_get_device_by_of_offset(UCLASS_PINCONFIG, | |
91 | config_node, &config); | |
92 | if (ret) | |
93 | return ret; | |
94 | ||
95 | ret = pinctrl_config_one(config); | |
96 | if (ret) | |
97 | return ret; | |
98 | } | |
99 | ||
100 | return 0; | |
101 | } | |
102 | ||
103 | /** | |
104 | * pinconfig_post-bind() - post binding for PINCONFIG uclass | |
105 | * Recursively bind its children as pinconfig devices. | |
106 | * | |
107 | * @dev: pinconfig device | |
108 | * @return: 0 on success, or negative error code on failure | |
109 | */ | |
110 | static int pinconfig_post_bind(struct udevice *dev) | |
111 | { | |
112 | const void *fdt = gd->fdt_blob; | |
113 | int offset = dev->of_offset; | |
114 | const char *name; | |
115 | int ret; | |
116 | ||
117 | for (offset = fdt_first_subnode(fdt, offset); | |
118 | offset > 0; | |
119 | offset = fdt_next_subnode(fdt, offset)) { | |
120 | /* | |
121 | * If this node has "compatible" property, this is not | |
122 | * a pin configuration node, but a normal device. skip. | |
123 | */ | |
124 | fdt_get_property(fdt, offset, "compatible", &ret); | |
125 | if (ret >= 0) | |
126 | continue; | |
127 | ||
128 | if (ret != -FDT_ERR_NOTFOUND) | |
129 | return ret; | |
130 | ||
131 | name = fdt_get_name(fdt, offset, NULL); | |
132 | if (!name) | |
133 | return -EINVAL; | |
134 | ret = device_bind_driver_to_node(dev, "pinconfig", name, | |
135 | offset, NULL); | |
136 | if (ret) | |
137 | return ret; | |
138 | } | |
139 | ||
140 | return 0; | |
141 | } | |
142 | ||
143 | UCLASS_DRIVER(pinconfig) = { | |
144 | .id = UCLASS_PINCONFIG, | |
145 | .post_bind = pinconfig_post_bind, | |
146 | .name = "pinconfig", | |
147 | }; | |
148 | ||
149 | U_BOOT_DRIVER(pinconfig_generic) = { | |
150 | .name = "pinconfig", | |
151 | .id = UCLASS_PINCONFIG, | |
152 | }; | |
153 | ||
154 | #else | |
155 | static int pinctrl_select_state_full(struct udevice *dev, const char *statename) | |
156 | { | |
157 | return -ENODEV; | |
158 | } | |
159 | ||
160 | static int pinconfig_post_bind(struct udevice *dev) | |
161 | { | |
8a5f6129 | 162 | return 0; |
d90a5a30 MY |
163 | } |
164 | #endif | |
165 | ||
166 | /** | |
167 | * pinctrl_select_state_simple() - simple implementation of pinctrl_select_state | |
168 | * | |
169 | * @dev: peripheral device | |
170 | * @return: 0 on success, or negative error code on failure | |
171 | */ | |
172 | static int pinctrl_select_state_simple(struct udevice *dev) | |
173 | { | |
174 | struct udevice *pctldev; | |
175 | struct pinctrl_ops *ops; | |
176 | int ret; | |
177 | ||
178 | /* | |
179 | * For simplicity, assume the first device of PINCTRL uclass | |
180 | * is the correct one. This is most likely OK as there is | |
181 | * usually only one pinctrl device on the system. | |
182 | */ | |
183 | ret = uclass_get_device(UCLASS_PINCTRL, 0, &pctldev); | |
184 | if (ret) | |
185 | return ret; | |
186 | ||
187 | ops = pinctrl_get_ops(pctldev); | |
188 | if (!ops->set_state_simple) { | |
189 | dev_dbg(dev, "set_state_simple op missing\n"); | |
190 | return -ENOSYS; | |
191 | } | |
192 | ||
193 | return ops->set_state_simple(pctldev, dev); | |
194 | } | |
195 | ||
196 | int pinctrl_select_state(struct udevice *dev, const char *statename) | |
197 | { | |
198 | /* | |
199 | * Try full-implemented pinctrl first. | |
200 | * If it fails or is not implemented, try simple one. | |
201 | */ | |
202 | if (pinctrl_select_state_full(dev, statename)) | |
203 | return pinctrl_select_state_simple(dev); | |
204 | ||
205 | return 0; | |
206 | } | |
207 | ||
c5acf4a2 SG |
208 | int pinctrl_request(struct udevice *dev, int func, int flags) |
209 | { | |
210 | struct pinctrl_ops *ops = pinctrl_get_ops(dev); | |
211 | ||
212 | if (!ops->request) | |
213 | return -ENOSYS; | |
214 | ||
215 | return ops->request(dev, func, flags); | |
216 | } | |
217 | ||
218 | int pinctrl_request_noflags(struct udevice *dev, int func) | |
219 | { | |
220 | return pinctrl_request(dev, func, 0); | |
221 | } | |
222 | ||
223 | int pinctrl_get_periph_id(struct udevice *dev, struct udevice *periph) | |
224 | { | |
225 | struct pinctrl_ops *ops = pinctrl_get_ops(dev); | |
226 | ||
227 | if (!ops->get_periph_id) | |
228 | return -ENOSYS; | |
229 | ||
230 | return ops->get_periph_id(dev, periph); | |
231 | } | |
232 | ||
d90a5a30 MY |
233 | /** |
234 | * pinconfig_post-bind() - post binding for PINCTRL uclass | |
235 | * Recursively bind child nodes as pinconfig devices in case of full pinctrl. | |
236 | * | |
237 | * @dev: pinctrl device | |
238 | * @return: 0 on success, or negative error code on failure | |
239 | */ | |
240 | static int pinctrl_post_bind(struct udevice *dev) | |
241 | { | |
242 | const struct pinctrl_ops *ops = pinctrl_get_ops(dev); | |
243 | ||
244 | if (!ops) { | |
245 | dev_dbg(dev, "ops is not set. Do not bind.\n"); | |
246 | return -EINVAL; | |
247 | } | |
248 | ||
249 | /* | |
8a5f6129 MY |
250 | * If set_state callback is set, we assume this pinctrl driver is the |
251 | * full implementation. In this case, its child nodes should be bound | |
252 | * so that peripheral devices can easily search in parent devices | |
253 | * during later DT-parsing. | |
d90a5a30 | 254 | */ |
8a5f6129 MY |
255 | if (ops->set_state) |
256 | return pinconfig_post_bind(dev); | |
257 | ||
258 | return 0; | |
d90a5a30 MY |
259 | } |
260 | ||
261 | UCLASS_DRIVER(pinctrl) = { | |
262 | .id = UCLASS_PINCTRL, | |
263 | .post_bind = pinctrl_post_bind, | |
264 | .name = "pinctrl", | |
265 | }; |