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Masahiro Yamadad90a5a32015-08-27 12:44:29 +09001/*
2 * Copyright (C) 2015 Masahiro Yamada <yamada.masahiro@socionext.com>
3 *
4 * SPDX-License-Identifier: GPL-2.0+
5 */
6
7#include <common.h>
Masahiro Yamadab08c8c42018-03-05 01:20:11 +09008#include <linux/libfdt.h>
Masahiro Yamadad90a5a32015-08-27 12:44:29 +09009#include <linux/err.h>
10#include <linux/list.h>
Simon Glass9d922452017-05-17 17:18:03 -060011#include <dm.h>
Masahiro Yamadad90a5a32015-08-27 12:44:29 +090012#include <dm/lists.h>
13#include <dm/pinctrl.h>
Heiko Stübner27326c72017-02-18 19:46:21 +010014#include <dm/util.h>
Masahiro Yamadad90a5a32015-08-27 12:44:29 +090015
16DECLARE_GLOBAL_DATA_PTR;
17
Simon Glass52db39a2016-01-21 19:43:26 -070018int 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
Masahiro Yamadad90a5a32015-08-27 12:44:29 +090030#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 */
37static 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 */
64static int pinctrl_select_state_full(struct udevice *dev, const char *statename)
65{
66 const void *fdt = gd->fdt_blob;
Simon Glasse160f7d2017-01-17 16:52:55 -070067 int node = dev_of_offset(dev);
Masahiro Yamadad90a5a32015-08-27 12:44:29 +090068 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
Simon Glassb02e4042016-10-02 17:59:28 -060075 state = fdt_stringlist_search(fdt, node, "pinctrl-names", statename);
Masahiro Yamadad90a5a32015-08-27 12:44:29 +090076 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/**
Masahiro Yamadaf8357062016-08-19 18:26:54 +0900116 * pinconfig_post_bind() - post binding for PINCONFIG uclass
Masahiro Yamadad90a5a32015-08-27 12:44:29 +0900117 * Recursively bind its children as pinconfig devices.
118 *
119 * @dev: pinconfig device
120 * @return: 0 on success, or negative error code on failure
121 */
122static int pinconfig_post_bind(struct udevice *dev)
123{
Simon Glass5589a812015-12-29 05:22:52 -0700124 bool pre_reloc_only = !(gd->flags & GD_FLG_RELOC);
Masahiro Yamadad90a5a32015-08-27 12:44:29 +0900125 const char *name;
Simon Glass45a26862017-05-18 20:09:07 -0600126 ofnode node;
Masahiro Yamadad90a5a32015-08-27 12:44:29 +0900127 int ret;
128
Simon Glass45a26862017-05-18 20:09:07 -0600129 dev_for_each_subnode(node, dev) {
Simon Glass5589a812015-12-29 05:22:52 -0700130 if (pre_reloc_only &&
Simon Glass45a26862017-05-18 20:09:07 -0600131 !ofnode_pre_reloc(node))
Simon Glass5589a812015-12-29 05:22:52 -0700132 continue;
Masahiro Yamadad90a5a32015-08-27 12:44:29 +0900133 /*
134 * If this node has "compatible" property, this is not
135 * a pin configuration node, but a normal device. skip.
136 */
Masahiro Yamada61e51ba2017-06-22 16:54:05 +0900137 ofnode_get_property(node, "compatible", &ret);
Masahiro Yamadad90a5a32015-08-27 12:44:29 +0900138 if (ret >= 0)
139 continue;
140
141 if (ret != -FDT_ERR_NOTFOUND)
142 return ret;
143
Simon Glass45a26862017-05-18 20:09:07 -0600144 name = ofnode_get_name(node);
Masahiro Yamadad90a5a32015-08-27 12:44:29 +0900145 if (!name)
146 return -EINVAL;
147 ret = device_bind_driver_to_node(dev, "pinconfig", name,
Simon Glass45a26862017-05-18 20:09:07 -0600148 node, NULL);
Masahiro Yamadad90a5a32015-08-27 12:44:29 +0900149 if (ret)
150 return ret;
151 }
152
153 return 0;
154}
155
156UCLASS_DRIVER(pinconfig) = {
157 .id = UCLASS_PINCONFIG,
158 .post_bind = pinconfig_post_bind,
159 .name = "pinconfig",
160};
161
162U_BOOT_DRIVER(pinconfig_generic) = {
163 .name = "pinconfig",
164 .id = UCLASS_PINCONFIG,
165};
166
167#else
168static int pinctrl_select_state_full(struct udevice *dev, const char *statename)
169{
170 return -ENODEV;
171}
172
173static int pinconfig_post_bind(struct udevice *dev)
174{
Masahiro Yamada8a5f6122015-09-06 01:44:50 +0900175 return 0;
Masahiro Yamadad90a5a32015-08-27 12:44:29 +0900176}
177#endif
178
179/**
180 * pinctrl_select_state_simple() - simple implementation of pinctrl_select_state
181 *
182 * @dev: peripheral device
183 * @return: 0 on success, or negative error code on failure
184 */
185static int pinctrl_select_state_simple(struct udevice *dev)
186{
187 struct udevice *pctldev;
188 struct pinctrl_ops *ops;
189 int ret;
190
191 /*
192 * For simplicity, assume the first device of PINCTRL uclass
193 * is the correct one. This is most likely OK as there is
194 * usually only one pinctrl device on the system.
195 */
196 ret = uclass_get_device(UCLASS_PINCTRL, 0, &pctldev);
197 if (ret)
198 return ret;
199
200 ops = pinctrl_get_ops(pctldev);
201 if (!ops->set_state_simple) {
202 dev_dbg(dev, "set_state_simple op missing\n");
203 return -ENOSYS;
204 }
205
206 return ops->set_state_simple(pctldev, dev);
207}
208
209int pinctrl_select_state(struct udevice *dev, const char *statename)
210{
211 /*
212 * Try full-implemented pinctrl first.
213 * If it fails or is not implemented, try simple one.
214 */
215 if (pinctrl_select_state_full(dev, statename))
216 return pinctrl_select_state_simple(dev);
217
218 return 0;
219}
220
Simon Glassc5acf4a2015-08-30 16:55:13 -0600221int pinctrl_request(struct udevice *dev, int func, int flags)
222{
223 struct pinctrl_ops *ops = pinctrl_get_ops(dev);
224
225 if (!ops->request)
226 return -ENOSYS;
227
228 return ops->request(dev, func, flags);
229}
230
231int pinctrl_request_noflags(struct udevice *dev, int func)
232{
233 return pinctrl_request(dev, func, 0);
234}
235
236int pinctrl_get_periph_id(struct udevice *dev, struct udevice *periph)
237{
238 struct pinctrl_ops *ops = pinctrl_get_ops(dev);
239
240 if (!ops->get_periph_id)
241 return -ENOSYS;
242
243 return ops->get_periph_id(dev, periph);
244}
245
Simon Glass77eaa192016-01-21 19:43:56 -0700246int pinctrl_get_gpio_mux(struct udevice *dev, int banknum, int index)
247{
248 struct pinctrl_ops *ops = pinctrl_get_ops(dev);
249
250 if (!ops->get_gpio_mux)
251 return -ENOSYS;
252
253 return ops->get_gpio_mux(dev, banknum, index);
254}
255
Masahiro Yamadad90a5a32015-08-27 12:44:29 +0900256/**
Masahiro Yamadaf8357062016-08-19 18:26:54 +0900257 * pinconfig_post_bind() - post binding for PINCTRL uclass
Masahiro Yamadad90a5a32015-08-27 12:44:29 +0900258 * Recursively bind child nodes as pinconfig devices in case of full pinctrl.
259 *
260 * @dev: pinctrl device
261 * @return: 0 on success, or negative error code on failure
262 */
263static int pinctrl_post_bind(struct udevice *dev)
264{
265 const struct pinctrl_ops *ops = pinctrl_get_ops(dev);
266
267 if (!ops) {
268 dev_dbg(dev, "ops is not set. Do not bind.\n");
269 return -EINVAL;
270 }
271
272 /*
Masahiro Yamada8a5f6122015-09-06 01:44:50 +0900273 * If set_state callback is set, we assume this pinctrl driver is the
274 * full implementation. In this case, its child nodes should be bound
275 * so that peripheral devices can easily search in parent devices
276 * during later DT-parsing.
Masahiro Yamadad90a5a32015-08-27 12:44:29 +0900277 */
Masahiro Yamada8a5f6122015-09-06 01:44:50 +0900278 if (ops->set_state)
279 return pinconfig_post_bind(dev);
280
281 return 0;
Masahiro Yamadad90a5a32015-08-27 12:44:29 +0900282}
283
284UCLASS_DRIVER(pinctrl) = {
285 .id = UCLASS_PINCTRL,
286 .post_bind = pinctrl_post_bind,
Thomas Abrahamac985272016-04-23 22:18:07 +0530287 .flags = DM_UC_FLAG_SEQ_ALIAS,
Masahiro Yamadad90a5a32015-08-27 12:44:29 +0900288 .name = "pinctrl",
289};