[mirror_ubuntu-zesty-kernel.git] / drivers / pinctrl / berlin / berlin.c

/*
 * Marvell Berlin SoC pinctrl core driver
 *
 * Copyright (C) 2014 Marvell Technology Group Ltd.
 *
 * Antoine Ténart <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/mfd/syscon.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 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		= &pinctrl_utils_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_set(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,
	.set_mux		= &berlin_pinmux_set,
};

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

	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 (IS_ERR(pctrl->pctrl_dev)) {
		dev_err(dev, "failed to register pinctrl driver\n");
		return PTR_ERR(pctrl->pctrl_dev);
	}

	return 0;
}

int berlin_pinctrl_probe(struct platform_device *pdev,
			 const struct berlin_pinctrl_desc *desc)
{
	struct device *dev = &pdev->dev;
	struct device_node *parent_np = of_get_parent(dev->of_node);
	struct regmap *regmap = syscon_node_to_regmap(parent_np);

	of_node_put(parent_np);
	if (IS_ERR(regmap))
		return PTR_ERR(regmap);

	return berlin_pinctrl_probe_regmap(pdev, desc, regmap);
}
Commit	Line	Data
3de68d33 AT	1	/*
	2	* Marvell Berlin SoC pinctrl core driver
	3	*
	4	* Copyright (C) 2014 Marvell Technology Group Ltd.
	5	*
1d48fb6e	6	* Antoine Ténart <antoine.tenart@free-electrons.com>
3de68d33 AT	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>
f52bf55c	14	#include <linux/mfd/syscon.h>
3de68d33 AT	15	#include <linux/module.h>
	16	#include <linux/of.h>
	17	#include <linux/of_address.h>
	18	#include <linux/of_device.h>
	19	#include <linux/pinctrl/pinctrl.h>
	20	#include <linux/pinctrl/pinmux.h>
	21	#include <linux/platform_device.h>
	22	#include <linux/regmap.h>
	23	#include <linux/slab.h>
	24
	25	#include "../core.h"
	26	#include "../pinctrl-utils.h"
	27	#include "berlin.h"
	28
	29	struct berlin_pinctrl {
	30	struct regmap *regmap;
	31	struct device *dev;
	32	const struct berlin_pinctrl_desc *desc;
	33	struct berlin_pinctrl_function *functions;
	34	unsigned nfunctions;
	35	struct pinctrl_dev *pctrl_dev;
	36	};
	37
	38	static int berlin_pinctrl_get_group_count(struct pinctrl_dev *pctrl_dev)
	39	{
	40	struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);
	41
	42	return pctrl->desc->ngroups;
	43	}
	44
	45	static const char berlin_pinctrl_get_group_name(struct pinctrl_dev pctrl_dev,
	46	unsigned group)
	47	{
	48	struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);
	49
	50	return pctrl->desc->groups[group].name;
	51	}
	52
	53	static int berlin_pinctrl_dt_node_to_map(struct pinctrl_dev *pctrl_dev,
	54	struct device_node *node,
	55	struct pinctrl_map **map,
	56	unsigned *num_maps)
	57	{
	58	struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);
	59	struct property *prop;
	60	const char function_name, group_name;
	61	unsigned reserved_maps = 0;
	62	int ret, ngroups;
	63
	64	*map = NULL;
	65	*num_maps = 0;
	66
	67	ret = of_property_read_string(node, "function", &function_name);
	68	if (ret) {
	69	dev_err(pctrl->dev,
	70	"missing function property in node %s\n",
	71	node->name);
	72	return -EINVAL;
	73	}
	74
	75	ngroups = of_property_count_strings(node, "groups");
	76	if (ngroups < 0) {
	77	dev_err(pctrl->dev,
	78	"missing groups property in node %s\n",
79	node->name);
80	return -EINVAL;
81	}
82
83	ret = pinctrl_utils_reserve_map(pctrl_dev, map, &reserved_maps,
84	num_maps, ngroups);
85	if (ret) {
86	dev_err(pctrl->dev, "can't reserve map: %d\n", ret);
87	return ret;
88	}
89
90	of_property_for_each_string(node, "groups", prop, group_name) {
91	ret = pinctrl_utils_add_map_mux(pctrl_dev, map, &reserved_maps,
92	num_maps, group_name,
93	function_name);
94	if (ret) {
95	dev_err(pctrl->dev, "can't add map: %d\n", ret);
96	return ret;
97	}
98	}
99
100	return 0;
101	}
102
3de68d33 AT	103	static const struct pinctrl_ops berlin_pinctrl_ops = {
	104	.get_groups_count = &berlin_pinctrl_get_group_count,
	105	.get_group_name = &berlin_pinctrl_get_group_name,
	106	.dt_node_to_map = &berlin_pinctrl_dt_node_to_map,
6064b147	107	.dt_free_map = &pinctrl_utils_dt_free_map,
3de68d33 AT	108	};
	109
	110	static int berlin_pinmux_get_functions_count(struct pinctrl_dev *pctrl_dev)
	111	{
	112	struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);
	113
	114	return pctrl->nfunctions;
	115	}
	116
	117	static const char berlin_pinmux_get_function_name(struct pinctrl_dev pctrl_dev,
	118	unsigned function)
	119	{
	120	struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);
	121
	122	return pctrl->functions[function].name;
	123	}
	124
	125	static int berlin_pinmux_get_function_groups(struct pinctrl_dev *pctrl_dev,
	126	unsigned function,
	127	const char * const **groups,
	128	unsigned * const num_groups)
	129	{
	130	struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);
	131
	132	*groups = pctrl->functions[function].groups;
	133	*num_groups = pctrl->functions[function].ngroups;
	134
	135	return 0;
	136	}
	137
	138	static struct berlin_desc_function *
	139	berlin_pinctrl_find_function_by_name(struct berlin_pinctrl *pctrl,
	140	const struct berlin_desc_group *group,
	141	const char *fname)
	142	{
	143	struct berlin_desc_function *function = group->functions;
	144
	145	while (function->name) {
	146	if (!strcmp(function->name, fname))
	147	return function;
	148
	149	function++;
	150	}
	151
	152	return NULL;
	153	}
	154
03e9f0ca LW	155	static int berlin_pinmux_set(struct pinctrl_dev *pctrl_dev,
	156	unsigned function,
	157	unsigned group)
3de68d33 AT	158	{
	159	struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);
	160	const struct berlin_desc_group *group_desc = pctrl->desc->groups + group;
	161	struct berlin_pinctrl_function *func = pctrl->functions + function;
	162	struct berlin_desc_function *function_desc =
	163	berlin_pinctrl_find_function_by_name(pctrl, group_desc,
	164	func->name);
	165	u32 mask, val;
	166
	167	if (!function_desc)
	168	return -EINVAL;
	169
	170	mask = GENMASK(group_desc->lsb + group_desc->bit_width - 1,
	171	group_desc->lsb);
	172	val = function_desc->muxval << group_desc->lsb;
	173	regmap_update_bits(pctrl->regmap, group_desc->offset, mask, val);
	174
	175	return 0;
	176	}
	177
	178	static const struct pinmux_ops berlin_pinmux_ops = {
	179	.get_functions_count = &berlin_pinmux_get_functions_count,
	180	.get_function_name = &berlin_pinmux_get_function_name,
	181	.get_function_groups = &berlin_pinmux_get_function_groups,
03e9f0ca	182	.set_mux = &berlin_pinmux_set,
3de68d33 AT	183	};
	184
	185	static int berlin_pinctrl_add_function(struct berlin_pinctrl *pctrl,
	186	const char *name)
	187	{
	188	struct berlin_pinctrl_function *function = pctrl->functions;
	189
	190	while (function->name) {
	191	if (!strcmp(function->name, name)) {
	192	function->ngroups++;
	193	return -EEXIST;
	194	}
	195	function++;
	196	}
	197
	198	function->name = name;
	199	function->ngroups = 1;
	200
	201	pctrl->nfunctions++;
	202
	203	return 0;
	204	}
	205
	206	static int berlin_pinctrl_build_state(struct platform_device *pdev)
	207	{
	208	struct berlin_pinctrl *pctrl = platform_get_drvdata(pdev);
	209	struct berlin_desc_group const *desc_group;
	210	struct berlin_desc_function const *desc_function;
	211	int i, max_functions = 0;
	212
	213	pctrl->nfunctions = 0;
	214
	215	for (i = 0; i < pctrl->desc->ngroups; i++) {
	216	desc_group = pctrl->desc->groups + i;
	217	/* compute the maxiumum number of functions a group can have */
	218	max_functions += 1 << (desc_group->bit_width + 1);
	219	}
	220
	221	/* we will reallocate later */
	222	pctrl->functions = devm_kzalloc(&pdev->dev,
	223	max_functions * sizeof(*pctrl->functions),
	224	GFP_KERNEL);
	225	if (!pctrl->functions)
	226	return -ENOMEM;
	227
	228	/* register all functions */
	229	for (i = 0; i < pctrl->desc->ngroups; i++) {
	230	desc_group = pctrl->desc->groups + i;
	231	desc_function = desc_group->functions;
	232
	233	while (desc_function->name) {
	234	berlin_pinctrl_add_function(pctrl, desc_function->name);
	235	desc_function++;
	236	}
	237	}
	238
	239	pctrl->functions = krealloc(pctrl->functions,
	240	pctrl->nfunctions * sizeof(*pctrl->functions),
	241	GFP_KERNEL);
	242
	243	/* map functions to theirs groups */
	244	for (i = 0; i < pctrl->desc->ngroups; i++) {
	245	desc_group = pctrl->desc->groups + i;
	246	desc_function = desc_group->functions;
247
248	while (desc_function->name) {
249	struct berlin_pinctrl_function
250	*function = pctrl->functions;
251	const char **groups;
252	bool found = false;
253
254	while (function->name) {
255	if (!strcmp(desc_function->name, function->name)) {
256	found = true;
257	break;
258	}
259	function++;
260	}
261
262	if (!found)
263	return -EINVAL;
264
265	if (!function->groups) {
266	function->groups =
267	devm_kzalloc(&pdev->dev,
268	function->ngroups * sizeof(char *),
269	GFP_KERNEL);
270
271	if (!function->groups)
272	return -ENOMEM;
273	}
274
275	groups = function->groups;
276	while (*groups)
277	groups++;
278
279	*groups = desc_group->name;
280
281	desc_function++;
282	}
283	}
284
285	return 0;
286	}
287
288	static struct pinctrl_desc berlin_pctrl_desc = {
289	.name = "berlin-pinctrl",
290	.pctlops = &berlin_pinctrl_ops,
291	.pmxops = &berlin_pinmux_ops,
292	.owner = THIS_MODULE,
293	};
294
d5c79fcb JZ	295	int berlin_pinctrl_probe_regmap(struct platform_device *pdev,
	296	const struct berlin_pinctrl_desc *desc,
	297	struct regmap *regmap)
3de68d33 AT	298	{
	299	struct device *dev = &pdev->dev;
	300	struct berlin_pinctrl *pctrl;
3de68d33 AT	301	int ret;
3de68d33 AT	302
3de68d33 AT	303	pctrl = devm_kzalloc(dev, sizeof(*pctrl), GFP_KERNEL);
	304	if (!pctrl)
	305	return -ENOMEM;
	306
	307	platform_set_drvdata(pdev, pctrl);
	308
	309	pctrl->regmap = regmap;
	310	pctrl->dev = &pdev->dev;
	311	pctrl->desc = desc;
	312
	313	ret = berlin_pinctrl_build_state(pdev);
	314	if (ret) {
	315	dev_err(dev, "cannot build driver state: %d\n", ret);
	316	return ret;
	317	}
	318
	319	pctrl->pctrl_dev = pinctrl_register(&berlin_pctrl_desc, dev, pctrl);
323de9ef	320	if (IS_ERR(pctrl->pctrl_dev)) {
3de68d33	321	dev_err(dev, "failed to register pinctrl driver\n");
323de9ef	322	return PTR_ERR(pctrl->pctrl_dev);
3de68d33 AT	323	}
	324
	325	return 0;
	326	}
d5c79fcb JZ	327
	328	int berlin_pinctrl_probe(struct platform_device *pdev,
	329	const struct berlin_pinctrl_desc *desc)
	330	{
	331	struct device *dev = &pdev->dev;
	332	struct device_node *parent_np = of_get_parent(dev->of_node);
	333	struct regmap *regmap = syscon_node_to_regmap(parent_np);
	334
	335	of_node_put(parent_np);
	336	if (IS_ERR(regmap))
	337	return PTR_ERR(regmap);
	338
	339	return berlin_pinctrl_probe_regmap(pdev, desc, regmap);
	340	}