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Commit | Line | Data |
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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 | ||
52db39a2 SG |
18 | int pinctrl_decode_pin_config(const void *blob, int node) |
19 | { | |
20 | int flags = 0; | |
21 | ||
22 | if (fdtdec_get_bool(blob, node, "bias-pull-up")) | |
23 | flags |= 1 << PIN_CONFIG_BIAS_PULL_UP; | |
24 | else if (fdtdec_get_bool(blob, node, "bias-pull-down")) | |
25 | flags |= 1 << PIN_CONFIG_BIAS_PULL_DOWN; | |
26 | ||
27 | return flags; | |
28 | } | |
29 | ||
d90a5a30 MY |
30 | #if CONFIG_IS_ENABLED(PINCTRL_FULL) |
31 | /** | |
32 | * pinctrl_config_one() - apply pinctrl settings for a single node | |
33 | * | |
34 | * @config: pin configuration node | |
35 | * @return: 0 on success, or negative error code on failure | |
36 | */ | |
37 | static int pinctrl_config_one(struct udevice *config) | |
38 | { | |
39 | struct udevice *pctldev; | |
40 | const struct pinctrl_ops *ops; | |
41 | ||
42 | pctldev = config; | |
43 | for (;;) { | |
44 | pctldev = dev_get_parent(pctldev); | |
45 | if (!pctldev) { | |
46 | dev_err(config, "could not find pctldev\n"); | |
47 | return -EINVAL; | |
48 | } | |
49 | if (pctldev->uclass->uc_drv->id == UCLASS_PINCTRL) | |
50 | break; | |
51 | } | |
52 | ||
53 | ops = pinctrl_get_ops(pctldev); | |
54 | return ops->set_state(pctldev, config); | |
55 | } | |
56 | ||
57 | /** | |
58 | * pinctrl_select_state_full() - full implementation of pinctrl_select_state | |
59 | * | |
60 | * @dev: peripheral device | |
61 | * @statename: state name, like "default" | |
62 | * @return: 0 on success, or negative error code on failure | |
63 | */ | |
64 | static int pinctrl_select_state_full(struct udevice *dev, const char *statename) | |
65 | { | |
66 | const void *fdt = gd->fdt_blob; | |
67 | int node = dev->of_offset; | |
68 | char propname[32]; /* long enough */ | |
69 | const fdt32_t *list; | |
70 | uint32_t phandle; | |
71 | int config_node; | |
72 | struct udevice *config; | |
73 | int state, size, i, ret; | |
74 | ||
75 | state = fdt_find_string(fdt, node, "pinctrl-names", statename); | |
76 | if (state < 0) { | |
77 | char *end; | |
78 | /* | |
79 | * If statename is not found in "pinctrl-names", | |
80 | * assume statename is just the integer state ID. | |
81 | */ | |
82 | state = simple_strtoul(statename, &end, 10); | |
83 | if (*end) | |
84 | return -EINVAL; | |
85 | } | |
86 | ||
87 | snprintf(propname, sizeof(propname), "pinctrl-%d", state); | |
88 | list = fdt_getprop(fdt, node, propname, &size); | |
89 | if (!list) | |
90 | return -EINVAL; | |
91 | ||
92 | size /= sizeof(*list); | |
93 | for (i = 0; i < size; i++) { | |
94 | phandle = fdt32_to_cpu(*list++); | |
95 | ||
96 | config_node = fdt_node_offset_by_phandle(fdt, phandle); | |
97 | if (config_node < 0) { | |
98 | dev_err(dev, "prop %s index %d invalid phandle\n", | |
99 | propname, i); | |
100 | return -EINVAL; | |
101 | } | |
102 | ret = uclass_get_device_by_of_offset(UCLASS_PINCONFIG, | |
103 | config_node, &config); | |
104 | if (ret) | |
105 | return ret; | |
106 | ||
107 | ret = pinctrl_config_one(config); | |
108 | if (ret) | |
109 | return ret; | |
110 | } | |
111 | ||
112 | return 0; | |
113 | } | |
114 | ||
115 | /** | |
116 | * pinconfig_post-bind() - post binding for PINCONFIG uclass | |
117 | * Recursively bind its children as pinconfig devices. | |
118 | * | |
119 | * @dev: pinconfig device | |
120 | * @return: 0 on success, or negative error code on failure | |
121 | */ | |
122 | static int pinconfig_post_bind(struct udevice *dev) | |
123 | { | |
124 | const void *fdt = gd->fdt_blob; | |
125 | int offset = dev->of_offset; | |
5589a818 | 126 | bool pre_reloc_only = !(gd->flags & GD_FLG_RELOC); |
d90a5a30 MY |
127 | const char *name; |
128 | int ret; | |
129 | ||
130 | for (offset = fdt_first_subnode(fdt, offset); | |
131 | offset > 0; | |
132 | offset = fdt_next_subnode(fdt, offset)) { | |
5589a818 SG |
133 | if (pre_reloc_only && |
134 | !fdt_getprop(fdt, offset, "u-boot,dm-pre-reloc", NULL)) | |
135 | continue; | |
d90a5a30 MY |
136 | /* |
137 | * If this node has "compatible" property, this is not | |
138 | * a pin configuration node, but a normal device. skip. | |
139 | */ | |
140 | fdt_get_property(fdt, offset, "compatible", &ret); | |
141 | if (ret >= 0) | |
142 | continue; | |
143 | ||
144 | if (ret != -FDT_ERR_NOTFOUND) | |
145 | return ret; | |
146 | ||
147 | name = fdt_get_name(fdt, offset, NULL); | |
148 | if (!name) | |
149 | return -EINVAL; | |
150 | ret = device_bind_driver_to_node(dev, "pinconfig", name, | |
151 | offset, NULL); | |
152 | if (ret) | |
153 | return ret; | |
154 | } | |
155 | ||
156 | return 0; | |
157 | } | |
158 | ||
159 | UCLASS_DRIVER(pinconfig) = { | |
160 | .id = UCLASS_PINCONFIG, | |
161 | .post_bind = pinconfig_post_bind, | |
162 | .name = "pinconfig", | |
163 | }; | |
164 | ||
165 | U_BOOT_DRIVER(pinconfig_generic) = { | |
166 | .name = "pinconfig", | |
167 | .id = UCLASS_PINCONFIG, | |
168 | }; | |
169 | ||
170 | #else | |
171 | static int pinctrl_select_state_full(struct udevice *dev, const char *statename) | |
172 | { | |
173 | return -ENODEV; | |
174 | } | |
175 | ||
176 | static int pinconfig_post_bind(struct udevice *dev) | |
177 | { | |
8a5f6129 | 178 | return 0; |
d90a5a30 MY |
179 | } |
180 | #endif | |
181 | ||
182 | /** | |
183 | * pinctrl_select_state_simple() - simple implementation of pinctrl_select_state | |
184 | * | |
185 | * @dev: peripheral device | |
186 | * @return: 0 on success, or negative error code on failure | |
187 | */ | |
188 | static int pinctrl_select_state_simple(struct udevice *dev) | |
189 | { | |
190 | struct udevice *pctldev; | |
191 | struct pinctrl_ops *ops; | |
192 | int ret; | |
193 | ||
194 | /* | |
195 | * For simplicity, assume the first device of PINCTRL uclass | |
196 | * is the correct one. This is most likely OK as there is | |
197 | * usually only one pinctrl device on the system. | |
198 | */ | |
199 | ret = uclass_get_device(UCLASS_PINCTRL, 0, &pctldev); | |
200 | if (ret) | |
201 | return ret; | |
202 | ||
203 | ops = pinctrl_get_ops(pctldev); | |
204 | if (!ops->set_state_simple) { | |
205 | dev_dbg(dev, "set_state_simple op missing\n"); | |
206 | return -ENOSYS; | |
207 | } | |
208 | ||
209 | return ops->set_state_simple(pctldev, dev); | |
210 | } | |
211 | ||
212 | int pinctrl_select_state(struct udevice *dev, const char *statename) | |
213 | { | |
214 | /* | |
215 | * Try full-implemented pinctrl first. | |
216 | * If it fails or is not implemented, try simple one. | |
217 | */ | |
218 | if (pinctrl_select_state_full(dev, statename)) | |
219 | return pinctrl_select_state_simple(dev); | |
220 | ||
221 | return 0; | |
222 | } | |
223 | ||
c5acf4a2 SG |
224 | int pinctrl_request(struct udevice *dev, int func, int flags) |
225 | { | |
226 | struct pinctrl_ops *ops = pinctrl_get_ops(dev); | |
227 | ||
228 | if (!ops->request) | |
229 | return -ENOSYS; | |
230 | ||
231 | return ops->request(dev, func, flags); | |
232 | } | |
233 | ||
234 | int pinctrl_request_noflags(struct udevice *dev, int func) | |
235 | { | |
236 | return pinctrl_request(dev, func, 0); | |
237 | } | |
238 | ||
239 | int pinctrl_get_periph_id(struct udevice *dev, struct udevice *periph) | |
240 | { | |
241 | struct pinctrl_ops *ops = pinctrl_get_ops(dev); | |
242 | ||
243 | if (!ops->get_periph_id) | |
244 | return -ENOSYS; | |
245 | ||
246 | return ops->get_periph_id(dev, periph); | |
247 | } | |
248 | ||
d90a5a30 MY |
249 | /** |
250 | * pinconfig_post-bind() - post binding for PINCTRL uclass | |
251 | * Recursively bind child nodes as pinconfig devices in case of full pinctrl. | |
252 | * | |
253 | * @dev: pinctrl device | |
254 | * @return: 0 on success, or negative error code on failure | |
255 | */ | |
256 | static int pinctrl_post_bind(struct udevice *dev) | |
257 | { | |
258 | const struct pinctrl_ops *ops = pinctrl_get_ops(dev); | |
259 | ||
260 | if (!ops) { | |
261 | dev_dbg(dev, "ops is not set. Do not bind.\n"); | |
262 | return -EINVAL; | |
263 | } | |
264 | ||
265 | /* | |
8a5f6129 MY |
266 | * If set_state callback is set, we assume this pinctrl driver is the |
267 | * full implementation. In this case, its child nodes should be bound | |
268 | * so that peripheral devices can easily search in parent devices | |
269 | * during later DT-parsing. | |
d90a5a30 | 270 | */ |
8a5f6129 MY |
271 | if (ops->set_state) |
272 | return pinconfig_post_bind(dev); | |
273 | ||
274 | return 0; | |
d90a5a30 MY |
275 | } |
276 | ||
277 | UCLASS_DRIVER(pinctrl) = { | |
278 | .id = UCLASS_PINCTRL, | |
279 | .post_bind = pinctrl_post_bind, | |
280 | .name = "pinctrl", | |
281 | }; |