2 * Marvell Berlin SoC pinctrl core driver
4 * Copyright (C) 2014 Marvell Technology Group Ltd.
6 * Antoine Ténart <antoine.tenart@free-electrons.com>
8 * This file is licensed under the terms of the GNU General Public
9 * License version 2. This program is licensed "as is" without any
10 * warranty of any kind, whether express or implied.
14 #include <linux/module.h>
16 #include <linux/of_address.h>
17 #include <linux/of_device.h>
18 #include <linux/pinctrl/pinctrl.h>
19 #include <linux/pinctrl/pinmux.h>
20 #include <linux/platform_device.h>
21 #include <linux/regmap.h>
22 #include <linux/slab.h>
25 #include "../pinctrl-utils.h"
28 struct berlin_pinctrl
{
29 struct regmap
*regmap
;
31 const struct berlin_pinctrl_desc
*desc
;
32 struct berlin_pinctrl_function
*functions
;
34 struct pinctrl_dev
*pctrl_dev
;
37 static int berlin_pinctrl_get_group_count(struct pinctrl_dev
*pctrl_dev
)
39 struct berlin_pinctrl
*pctrl
= pinctrl_dev_get_drvdata(pctrl_dev
);
41 return pctrl
->desc
->ngroups
;
44 static const char *berlin_pinctrl_get_group_name(struct pinctrl_dev
*pctrl_dev
,
47 struct berlin_pinctrl
*pctrl
= pinctrl_dev_get_drvdata(pctrl_dev
);
49 return pctrl
->desc
->groups
[group
].name
;
52 static int berlin_pinctrl_dt_node_to_map(struct pinctrl_dev
*pctrl_dev
,
53 struct device_node
*node
,
54 struct pinctrl_map
**map
,
57 struct berlin_pinctrl
*pctrl
= pinctrl_dev_get_drvdata(pctrl_dev
);
58 struct property
*prop
;
59 const char *function_name
, *group_name
;
60 unsigned reserved_maps
= 0;
66 ret
= of_property_read_string(node
, "function", &function_name
);
69 "missing function property in node %s\n",
74 ngroups
= of_property_count_strings(node
, "groups");
77 "missing groups property in node %s\n",
82 ret
= pinctrl_utils_reserve_map(pctrl_dev
, map
, &reserved_maps
,
85 dev_err(pctrl
->dev
, "can't reserve map: %d\n", ret
);
89 of_property_for_each_string(node
, "groups", prop
, group_name
) {
90 ret
= pinctrl_utils_add_map_mux(pctrl_dev
, map
, &reserved_maps
,
94 dev_err(pctrl
->dev
, "can't add map: %d\n", ret
);
102 static void berlin_pinctrl_dt_free_map(struct pinctrl_dev
*pctrl_dev
,
103 struct pinctrl_map
*map
,
108 for (i
= 0; i
< nmaps
; i
++) {
109 if (map
[i
].type
== PIN_MAP_TYPE_MUX_GROUP
) {
110 kfree(map
[i
].data
.mux
.group
);
112 /* a function can be applied to multiple groups */
114 kfree(map
[i
].data
.mux
.function
);
121 static const struct pinctrl_ops berlin_pinctrl_ops
= {
122 .get_groups_count
= &berlin_pinctrl_get_group_count
,
123 .get_group_name
= &berlin_pinctrl_get_group_name
,
124 .dt_node_to_map
= &berlin_pinctrl_dt_node_to_map
,
125 .dt_free_map
= &berlin_pinctrl_dt_free_map
,
128 static int berlin_pinmux_get_functions_count(struct pinctrl_dev
*pctrl_dev
)
130 struct berlin_pinctrl
*pctrl
= pinctrl_dev_get_drvdata(pctrl_dev
);
132 return pctrl
->nfunctions
;
135 static const char *berlin_pinmux_get_function_name(struct pinctrl_dev
*pctrl_dev
,
138 struct berlin_pinctrl
*pctrl
= pinctrl_dev_get_drvdata(pctrl_dev
);
140 return pctrl
->functions
[function
].name
;
143 static int berlin_pinmux_get_function_groups(struct pinctrl_dev
*pctrl_dev
,
145 const char * const **groups
,
146 unsigned * const num_groups
)
148 struct berlin_pinctrl
*pctrl
= pinctrl_dev_get_drvdata(pctrl_dev
);
150 *groups
= pctrl
->functions
[function
].groups
;
151 *num_groups
= pctrl
->functions
[function
].ngroups
;
156 static struct berlin_desc_function
*
157 berlin_pinctrl_find_function_by_name(struct berlin_pinctrl
*pctrl
,
158 const struct berlin_desc_group
*group
,
161 struct berlin_desc_function
*function
= group
->functions
;
163 while (function
->name
) {
164 if (!strcmp(function
->name
, fname
))
173 static int berlin_pinmux_enable(struct pinctrl_dev
*pctrl_dev
,
177 struct berlin_pinctrl
*pctrl
= pinctrl_dev_get_drvdata(pctrl_dev
);
178 const struct berlin_desc_group
*group_desc
= pctrl
->desc
->groups
+ group
;
179 struct berlin_pinctrl_function
*func
= pctrl
->functions
+ function
;
180 struct berlin_desc_function
*function_desc
=
181 berlin_pinctrl_find_function_by_name(pctrl
, group_desc
,
188 mask
= GENMASK(group_desc
->lsb
+ group_desc
->bit_width
- 1,
190 val
= function_desc
->muxval
<< group_desc
->lsb
;
191 regmap_update_bits(pctrl
->regmap
, group_desc
->offset
, mask
, val
);
196 static const struct pinmux_ops berlin_pinmux_ops
= {
197 .get_functions_count
= &berlin_pinmux_get_functions_count
,
198 .get_function_name
= &berlin_pinmux_get_function_name
,
199 .get_function_groups
= &berlin_pinmux_get_function_groups
,
200 .enable
= &berlin_pinmux_enable
,
203 static int berlin_pinctrl_add_function(struct berlin_pinctrl
*pctrl
,
206 struct berlin_pinctrl_function
*function
= pctrl
->functions
;
208 while (function
->name
) {
209 if (!strcmp(function
->name
, name
)) {
216 function
->name
= name
;
217 function
->ngroups
= 1;
224 static int berlin_pinctrl_build_state(struct platform_device
*pdev
)
226 struct berlin_pinctrl
*pctrl
= platform_get_drvdata(pdev
);
227 struct berlin_desc_group
const *desc_group
;
228 struct berlin_desc_function
const *desc_function
;
229 int i
, max_functions
= 0;
231 pctrl
->nfunctions
= 0;
233 for (i
= 0; i
< pctrl
->desc
->ngroups
; i
++) {
234 desc_group
= pctrl
->desc
->groups
+ i
;
235 /* compute the maxiumum number of functions a group can have */
236 max_functions
+= 1 << (desc_group
->bit_width
+ 1);
239 /* we will reallocate later */
240 pctrl
->functions
= devm_kzalloc(&pdev
->dev
,
241 max_functions
* sizeof(*pctrl
->functions
),
243 if (!pctrl
->functions
)
246 /* register all functions */
247 for (i
= 0; i
< pctrl
->desc
->ngroups
; i
++) {
248 desc_group
= pctrl
->desc
->groups
+ i
;
249 desc_function
= desc_group
->functions
;
251 while (desc_function
->name
) {
252 berlin_pinctrl_add_function(pctrl
, desc_function
->name
);
257 pctrl
->functions
= krealloc(pctrl
->functions
,
258 pctrl
->nfunctions
* sizeof(*pctrl
->functions
),
261 /* map functions to theirs groups */
262 for (i
= 0; i
< pctrl
->desc
->ngroups
; i
++) {
263 desc_group
= pctrl
->desc
->groups
+ i
;
264 desc_function
= desc_group
->functions
;
266 while (desc_function
->name
) {
267 struct berlin_pinctrl_function
268 *function
= pctrl
->functions
;
272 while (function
->name
) {
273 if (!strcmp(desc_function
->name
, function
->name
)) {
283 if (!function
->groups
) {
285 devm_kzalloc(&pdev
->dev
,
286 function
->ngroups
* sizeof(char *),
289 if (!function
->groups
)
293 groups
= function
->groups
;
297 *groups
= desc_group
->name
;
306 static struct pinctrl_desc berlin_pctrl_desc
= {
307 .name
= "berlin-pinctrl",
308 .pctlops
= &berlin_pinctrl_ops
,
309 .pmxops
= &berlin_pinmux_ops
,
310 .owner
= THIS_MODULE
,
313 int berlin_pinctrl_probe(struct platform_device
*pdev
,
314 const struct berlin_pinctrl_desc
*desc
)
316 struct device
*dev
= &pdev
->dev
;
317 struct berlin_pinctrl
*pctrl
;
318 struct regmap
*regmap
;
321 regmap
= dev_get_regmap(&pdev
->dev
, NULL
);
325 pctrl
= devm_kzalloc(dev
, sizeof(*pctrl
), GFP_KERNEL
);
329 platform_set_drvdata(pdev
, pctrl
);
331 pctrl
->regmap
= regmap
;
332 pctrl
->dev
= &pdev
->dev
;
335 ret
= berlin_pinctrl_build_state(pdev
);
337 dev_err(dev
, "cannot build driver state: %d\n", ret
);
341 pctrl
->pctrl_dev
= pinctrl_register(&berlin_pctrl_desc
, dev
, pctrl
);
342 if (!pctrl
->pctrl_dev
) {
343 dev_err(dev
, "failed to register pinctrl driver\n");