[deliverable/linux.git] / drivers / pinctrl / berlin / berlin.c

/*
 * Marvell Berlin SoC pinctrl core driver
 *
 * Copyright (C) 2014 Marvell Technology Group Ltd.
 *
 * Antoine TÃ©nart <antoine.tenart@free-electrons.com>
 *
 * This file is licensed under the terms of the GNU General Public
 * License version 2. This program is licensed "as is" without any
 * warranty of any kind, whether express or implied.
 */

#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinmux.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/slab.h>

#include "../core.h"
#include "../pinctrl-utils.h"
#include "berlin.h"

struct berlin_pinctrl {
	struct regmap *regmap;
	struct device *dev;
	const struct berlin_pinctrl_desc *desc;
	struct berlin_pinctrl_function *functions;
	unsigned nfunctions;
	struct pinctrl_dev *pctrl_dev;
};

static int berlin_pinctrl_get_group_count(struct pinctrl_dev *pctrl_dev)
{
	struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);

	return pctrl->desc->ngroups;
}

static const char *berlin_pinctrl_get_group_name(struct pinctrl_dev *pctrl_dev,
						 unsigned group)
{
	struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);

	return pctrl->desc->groups[group].name;
}

static int berlin_pinctrl_dt_node_to_map(struct pinctrl_dev *pctrl_dev,
					 struct device_node *node,
					 struct pinctrl_map **map,
					 unsigned *num_maps)
{
	struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);
	struct property *prop;
	const char *function_name, *group_name;
	unsigned reserved_maps = 0;
	int ret, ngroups;

	*map = NULL;
	*num_maps = 0;

	ret = of_property_read_string(node, "function", &function_name);
	if (ret) {
		dev_err(pctrl->dev,
			"missing function property in node %s\n",
			node->name);
		return -EINVAL;
	}

	ngroups = of_property_count_strings(node, "groups");
	if (ngroups < 0) {
		dev_err(pctrl->dev,
			"missing groups property in node %s\n",
			node->name);
		return -EINVAL;
	}

	ret = pinctrl_utils_reserve_map(pctrl_dev, map, &reserved_maps,
					num_maps, ngroups);
	if (ret) {
		dev_err(pctrl->dev, "can't reserve map: %d\n", ret);
		return ret;
	}

	of_property_for_each_string(node, "groups", prop, group_name) {
		ret = pinctrl_utils_add_map_mux(pctrl_dev, map, &reserved_maps,
						num_maps, group_name,
						function_name);
		if (ret) {
			dev_err(pctrl->dev, "can't add map: %d\n", ret);
			return ret;
		}
	}

	return 0;
}

static void berlin_pinctrl_dt_free_map(struct pinctrl_dev *pctrl_dev,
				       struct pinctrl_map *map,
				       unsigned nmaps)
{
	int i;

	for (i = 0; i < nmaps; i++) {
		if (map[i].type == PIN_MAP_TYPE_MUX_GROUP) {
			kfree(map[i].data.mux.group);

			/* a function can be applied to multiple groups */
			if (i == 0)
				kfree(map[i].data.mux.function);
		}
	}

	kfree(map);
}

static const struct pinctrl_ops berlin_pinctrl_ops = {
	.get_groups_count	= &berlin_pinctrl_get_group_count,
	.get_group_name		= &berlin_pinctrl_get_group_name,
	.dt_node_to_map		= &berlin_pinctrl_dt_node_to_map,
	.dt_free_map		= &berlin_pinctrl_dt_free_map,
};

static int berlin_pinmux_get_functions_count(struct pinctrl_dev *pctrl_dev)
{
	struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);

	return pctrl->nfunctions;
}

static const char *berlin_pinmux_get_function_name(struct pinctrl_dev *pctrl_dev,
						   unsigned function)
{
	struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);

	return pctrl->functions[function].name;
}

static int berlin_pinmux_get_function_groups(struct pinctrl_dev *pctrl_dev,
					     unsigned function,
					     const char * const **groups,
					     unsigned * const num_groups)
{
	struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);

	*groups = pctrl->functions[function].groups;
	*num_groups = pctrl->functions[function].ngroups;

	return 0;
}

static struct berlin_desc_function *
berlin_pinctrl_find_function_by_name(struct berlin_pinctrl *pctrl,
				     const struct berlin_desc_group *group,
				     const char *fname)
{
	struct berlin_desc_function *function = group->functions;

	while (function->name) {
		if (!strcmp(function->name, fname))
			return function;

		function++;
	}

	return NULL;
}

static int berlin_pinmux_enable(struct pinctrl_dev *pctrl_dev,
				unsigned function,
				unsigned group)
{
	struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);
	const struct berlin_desc_group *group_desc = pctrl->desc->groups + group;
	struct berlin_pinctrl_function *func = pctrl->functions + function;
	struct berlin_desc_function *function_desc =
		berlin_pinctrl_find_function_by_name(pctrl, group_desc,
						     func->name);
	u32 mask, val;

	if (!function_desc)
		return -EINVAL;

	mask = GENMASK(group_desc->lsb + group_desc->bit_width - 1,
		       group_desc->lsb);
	val = function_desc->muxval << group_desc->lsb;
	regmap_update_bits(pctrl->regmap, group_desc->offset, mask, val);

	return 0;
}

static const struct pinmux_ops berlin_pinmux_ops = {
	.get_functions_count	= &berlin_pinmux_get_functions_count,
	.get_function_name	= &berlin_pinmux_get_function_name,
	.get_function_groups	= &berlin_pinmux_get_function_groups,
	.enable			= &berlin_pinmux_enable,
};

static int berlin_pinctrl_add_function(struct berlin_pinctrl *pctrl,
				       const char *name)
{
	struct berlin_pinctrl_function *function = pctrl->functions;

	while (function->name) {
		if (!strcmp(function->name, name)) {
			function->ngroups++;
			return -EEXIST;
		}
		function++;
	}

	function->name = name;
	function->ngroups = 1;

	pctrl->nfunctions++;

	return 0;
}

static int berlin_pinctrl_build_state(struct platform_device *pdev)
{
	struct berlin_pinctrl *pctrl = platform_get_drvdata(pdev);
	struct berlin_desc_group const *desc_group;
	struct berlin_desc_function const *desc_function;
	int i, max_functions = 0;

	pctrl->nfunctions = 0;

	for (i = 0; i < pctrl->desc->ngroups; i++) {
		desc_group = pctrl->desc->groups + i;
		/* compute the maxiumum number of functions a group can have */
		max_functions += 1 << (desc_group->bit_width + 1);
	}

	/* we will reallocate later */
	pctrl->functions = devm_kzalloc(&pdev->dev,
					max_functions * sizeof(*pctrl->functions),
					GFP_KERNEL);
	if (!pctrl->functions)
		return -ENOMEM;

	/* register all functions */
	for (i = 0; i < pctrl->desc->ngroups; i++) {
		desc_group = pctrl->desc->groups + i;
		desc_function = desc_group->functions;

		while (desc_function->name) {
			berlin_pinctrl_add_function(pctrl, desc_function->name);
			desc_function++;
		}
	}

	pctrl->functions = krealloc(pctrl->functions,
				    pctrl->nfunctions * sizeof(*pctrl->functions),
				    GFP_KERNEL);

	/* map functions to theirs groups */
	for (i = 0; i < pctrl->desc->ngroups; i++) {
		desc_group = pctrl->desc->groups + i;
		desc_function = desc_group->functions;

		while (desc_function->name) {
			struct berlin_pinctrl_function
				*function = pctrl->functions;
			const char **groups;
			bool found = false;

			while (function->name) {
				if (!strcmp(desc_function->name, function->name)) {
					found = true;
					break;
				}
				function++;
			}

			if (!found)
				return -EINVAL;

			if (!function->groups) {
				function->groups =
					devm_kzalloc(&pdev->dev,
						     function->ngroups * sizeof(char *),
						     GFP_KERNEL);

				if (!function->groups)
					return -ENOMEM;
			}

			groups = function->groups;
			while (*groups)
				groups++;

			*groups = desc_group->name;

			desc_function++;
		}
	}

	return 0;
}

static struct pinctrl_desc berlin_pctrl_desc = {
	.name		= "berlin-pinctrl",
	.pctlops	= &berlin_pinctrl_ops,
	.pmxops		= &berlin_pinmux_ops,
	.owner		= THIS_MODULE,
};

int berlin_pinctrl_probe(struct platform_device *pdev,
			 const struct berlin_pinctrl_desc *desc)
{
	struct device *dev = &pdev->dev;
	struct berlin_pinctrl *pctrl;
	struct regmap *regmap;
	int ret;

	regmap = dev_get_regmap(&pdev->dev, NULL);
	if (!regmap)
		return -ENODEV;

	pctrl = devm_kzalloc(dev, sizeof(*pctrl), GFP_KERNEL);
	if (!pctrl)
		return -ENOMEM;

	platform_set_drvdata(pdev, pctrl);

	pctrl->regmap = regmap;
	pctrl->dev = &pdev->dev;
	pctrl->desc = desc;

	ret = berlin_pinctrl_build_state(pdev);
	if (ret) {
		dev_err(dev, "cannot build driver state: %d\n", ret);
		return ret;
	}

	pctrl->pctrl_dev = pinctrl_register(&berlin_pctrl_desc, dev, pctrl);
	if (!pctrl->pctrl_dev) {
		dev_err(dev, "failed to register pinctrl driver\n");
		return -EINVAL;
	}

	return 0;
}
Commit	Line	Data
3de68d33 AT	1	/*
	2	* Marvell Berlin SoC pinctrl core driver
	3	*
	4	* Copyright (C) 2014 Marvell Technology Group Ltd.
	5	*
	6	* Antoine TÃ©nart <antoine.tenart@free-electrons.com>
	7	*
	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.
	11	*/
	12
	13	#include <linux/io.h>
	14	#include <linux/module.h>
	15	#include <linux/of.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>
	23
	24	#include "../core.h"
	25	#include "../pinctrl-utils.h"
	26	#include "berlin.h"
	27
	28	struct berlin_pinctrl {
	29	struct regmap *regmap;
	30	struct device *dev;
	31	const struct berlin_pinctrl_desc *desc;
	32	struct berlin_pinctrl_function *functions;
	33	unsigned nfunctions;
	34	struct pinctrl_dev *pctrl_dev;
	35	};
	36
	37	static int berlin_pinctrl_get_group_count(struct pinctrl_dev *pctrl_dev)
	38	{
	39	struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);
	40
	41	return pctrl->desc->ngroups;
	42	}
	43
	44	static const char berlin_pinctrl_get_group_name(struct pinctrl_dev pctrl_dev,
	45	unsigned group)
	46	{
	47	struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);
	48
	49	return pctrl->desc->groups[group].name;
	50	}
	51
	52	static int berlin_pinctrl_dt_node_to_map(struct pinctrl_dev *pctrl_dev,
	53	struct device_node *node,
	54	struct pinctrl_map **map,
	55	unsigned *num_maps)
	56	{
	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;
	61	int ret, ngroups;
	62
	63	*map = NULL;
	64	*num_maps = 0;
65
66	ret = of_property_read_string(node, "function", &function_name);
67	if (ret) {
68	dev_err(pctrl->dev,
69	"missing function property in node %s\n",
70	node->name);
71	return -EINVAL;
72	}
73
74	ngroups = of_property_count_strings(node, "groups");
75	if (ngroups < 0) {
76	dev_err(pctrl->dev,
77	"missing groups property in node %s\n",
78	node->name);
79	return -EINVAL;
80	}
81
82	ret = pinctrl_utils_reserve_map(pctrl_dev, map, &reserved_maps,
83	num_maps, ngroups);
84	if (ret) {
85	dev_err(pctrl->dev, "can't reserve map: %d\n", ret);
86	return ret;
87	}
88
89	of_property_for_each_string(node, "groups", prop, group_name) {
90	ret = pinctrl_utils_add_map_mux(pctrl_dev, map, &reserved_maps,
91	num_maps, group_name,
92	function_name);
93	if (ret) {
94	dev_err(pctrl->dev, "can't add map: %d\n", ret);
95	return ret;
96	}
97	}
98
99	return 0;
100	}
101
102	static void berlin_pinctrl_dt_free_map(struct pinctrl_dev *pctrl_dev,
103	struct pinctrl_map *map,
104	unsigned nmaps)
105	{
106	int i;
107
108	for (i = 0; i < nmaps; i++) {
109	if (map[i].type == PIN_MAP_TYPE_MUX_GROUP) {
110	kfree(map[i].data.mux.group);
111
112	/* a function can be applied to multiple groups */
113	if (i == 0)
114	kfree(map[i].data.mux.function);
115	}
116	}
117
118	kfree(map);
119	}
120
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,
126	};
127
128	static int berlin_pinmux_get_functions_count(struct pinctrl_dev *pctrl_dev)
129	{
130	struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);
131
132	return pctrl->nfunctions;
133	}
134
135	static const char berlin_pinmux_get_function_name(struct pinctrl_dev pctrl_dev,
136	unsigned function)
137	{
138	struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);
139
140	return pctrl->functions[function].name;
141	}
142
143	static int berlin_pinmux_get_function_groups(struct pinctrl_dev *pctrl_dev,
144	unsigned function,
145	const char * const **groups,
146	unsigned * const num_groups)
147	{
148	struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);
149
150	*groups = pctrl->functions[function].groups;
151	*num_groups = pctrl->functions[function].ngroups;
152
153	return 0;
154	}
155
156	static struct berlin_desc_function *
157	berlin_pinctrl_find_function_by_name(struct berlin_pinctrl *pctrl,
158	const struct berlin_desc_group *group,
159	const char *fname)
160	{
161	struct berlin_desc_function *function = group->functions;
162
163	while (function->name) {
164	if (!strcmp(function->name, fname))
165	return function;
166
167	function++;
168	}
169
170	return NULL;
171	}
172
173	static int berlin_pinmux_enable(struct pinctrl_dev *pctrl_dev,
174	unsigned function,
175	unsigned group)
176	{
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,
182	func->name);
183	u32 mask, val;
184
185	if (!function_desc)
186	return -EINVAL;
187
188	mask = GENMASK(group_desc->lsb + group_desc->bit_width - 1,
189	group_desc->lsb);
190	val = function_desc->muxval << group_desc->lsb;
191	regmap_update_bits(pctrl->regmap, group_desc->offset, mask, val);
192
193	return 0;
194	}
195
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,
201	};
202
203	static int berlin_pinctrl_add_function(struct berlin_pinctrl *pctrl,
204	const char *name)
205	{
206	struct berlin_pinctrl_function *function = pctrl->functions;
207
208	while (function->name) {
209	if (!strcmp(function->name, name)) {
210	function->ngroups++;
211	return -EEXIST;
212	}
213	function++;
214	}
215
216	function->name = name;
217	function->ngroups = 1;
218
219	pctrl->nfunctions++;
220
221	return 0;
222	}
223
224	static int berlin_pinctrl_build_state(struct platform_device *pdev)
225	{
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;
230
231	pctrl->nfunctions = 0;
232
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);
237	}
238
239	/* we will reallocate later */
240	pctrl->functions = devm_kzalloc(&pdev->dev,
241	max_functions * sizeof(*pctrl->functions),
242	GFP_KERNEL);
243	if (!pctrl->functions)
244	return -ENOMEM;
245
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;
250
251	while (desc_function->name) {
252	berlin_pinctrl_add_function(pctrl, desc_function->name);
253	desc_function++;
254	}
255	}
256
257	pctrl->functions = krealloc(pctrl->functions,
258	pctrl->nfunctions * sizeof(*pctrl->functions),
259	GFP_KERNEL);
260
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;
265
266	while (desc_function->name) {
267	struct berlin_pinctrl_function
268	*function = pctrl->functions;
269	const char **groups;
270	bool found = false;
271
272	while (function->name) {
273	if (!strcmp(desc_function->name, function->name)) {
274	found = true;
275	break;
276	}
277	function++;
278	}
279
280	if (!found)
281	return -EINVAL;
282
283	if (!function->groups) {
284	function->groups =
285	devm_kzalloc(&pdev->dev,
286	function->ngroups * sizeof(char *),
287	GFP_KERNEL);
288
289	if (!function->groups)
290	return -ENOMEM;
291	}
292
293	groups = function->groups;
294	while (*groups)
295	groups++;
296
297	*groups = desc_group->name;
298
299	desc_function++;
300	}
301	}
302
303	return 0;
304	}
305
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,
311	};
312
313	int berlin_pinctrl_probe(struct platform_device *pdev,
314	const struct berlin_pinctrl_desc *desc)
315	{
316	struct device *dev = &pdev->dev;
317	struct berlin_pinctrl *pctrl;
318	struct regmap *regmap;
319	int ret;
320
321	regmap = dev_get_regmap(&pdev->dev, NULL);
322	if (!regmap)
1419d815	323	return -ENODEV;
3de68d33 AT	324
	325	pctrl = devm_kzalloc(dev, sizeof(*pctrl), GFP_KERNEL);
	326	if (!pctrl)
	327	return -ENOMEM;
	328
	329	platform_set_drvdata(pdev, pctrl);
	330
	331	pctrl->regmap = regmap;
	332	pctrl->dev = &pdev->dev;
	333	pctrl->desc = desc;
	334
	335	ret = berlin_pinctrl_build_state(pdev);
	336	if (ret) {
	337	dev_err(dev, "cannot build driver state: %d\n", ret);
	338	return ret;
	339	}
	340
	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");
	344	return -EINVAL;
	345	}
	346
	347	return 0;
	348	}