[deliverable/linux.git] / drivers / pinctrl / spear / pinctrl-spear.c

/*
 * Driver for the ST Microelectronics SPEAr pinmux
 *
 * Copyright (C) 2012 ST Microelectronics
 * Viresh Kumar <viresh.linux@gmail.com>
 *
 * Inspired from:
 * - U300 Pinctl drivers
 * - Tegra Pinctl drivers
 *
 * 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/err.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/pinctrl/machine.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinmux.h>
#include <linux/platform_device.h>
#include <linux/slab.h>

#include "pinctrl-spear.h"

#define DRIVER_NAME "spear-pinmux"

static inline u32 pmx_readl(struct spear_pmx *pmx, u32 reg)
{
	return readl_relaxed(pmx->vbase + reg);
}

static inline void pmx_writel(struct spear_pmx *pmx, u32 val, u32 reg)
{
	writel_relaxed(val, pmx->vbase + reg);
}

static int set_mode(struct spear_pmx *pmx, int mode)
{
	struct spear_pmx_mode *pmx_mode = NULL;
	int i;
	u32 val;

	if (!pmx->machdata->pmx_modes || !pmx->machdata->npmx_modes)
		return -EINVAL;

	for (i = 0; i < pmx->machdata->npmx_modes; i++) {
		if (pmx->machdata->pmx_modes[i]->mode == (1 << mode)) {
			pmx_mode = pmx->machdata->pmx_modes[i];
			break;
		}
	}

	if (!pmx_mode)
		return -EINVAL;

	val = pmx_readl(pmx, pmx_mode->reg);
	val &= ~pmx_mode->mask;
	val |= pmx_mode->val;
	pmx_writel(pmx, val, pmx_mode->reg);

	pmx->machdata->mode = pmx_mode->mode;
	dev_info(pmx->dev, "Configured Mode: %s with id: %x\n\n",
			pmx_mode->name ? pmx_mode->name : "no_name",
			pmx_mode->reg);

	return 0;
}

void __devinit pmx_init_addr(struct spear_pinctrl_machdata *machdata, u16 reg)
{
	struct spear_pingroup *pgroup;
	struct spear_modemux *modemux;
	int i, j, group;

	for (group = 0; group < machdata->ngroups; group++) {
		pgroup = machdata->groups[group];

		for (i = 0; i < pgroup->nmodemuxs; i++) {
			modemux = &pgroup->modemuxs[i];

			for (j = 0; j < modemux->nmuxregs; j++)
				if (modemux->muxregs[j].reg == 0xFFFF)
					modemux->muxregs[j].reg = reg;
		}
	}
}

static int spear_pinctrl_get_groups_cnt(struct pinctrl_dev *pctldev)
{
	struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);

	return pmx->machdata->ngroups;
}

static const char *spear_pinctrl_get_group_name(struct pinctrl_dev *pctldev,
		unsigned group)
{
	struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);

	return pmx->machdata->groups[group]->name;
}

static int spear_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
		unsigned group, const unsigned **pins, unsigned *num_pins)
{
	struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);

	*pins = pmx->machdata->groups[group]->pins;
	*num_pins = pmx->machdata->groups[group]->npins;

	return 0;
}

static void spear_pinctrl_pin_dbg_show(struct pinctrl_dev *pctldev,
		struct seq_file *s, unsigned offset)
{
	seq_printf(s, " " DRIVER_NAME);
}

int spear_pinctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
				 struct device_node *np_config,
				 struct pinctrl_map **map, unsigned *num_maps)
{
	struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
	struct device_node *np;
	struct property *prop;
	const char *function, *group;
	int ret, index = 0, count = 0;

	/* calculate number of maps required */
	for_each_child_of_node(np_config, np) {
		ret = of_property_read_string(np, "st,function", &function);
		if (ret < 0)
			return ret;

		ret = of_property_count_strings(np, "st,pins");
		if (ret < 0)
			return ret;

		count += ret;
	}

	if (!count) {
		dev_err(pmx->dev, "No child nodes passed via DT\n");
		return -ENODEV;
	}

	*map = kzalloc(sizeof(**map) * count, GFP_KERNEL);
	if (!*map)
		return -ENOMEM;

	for_each_child_of_node(np_config, np) {
		of_property_read_string(np, "st,function", &function);
		of_property_for_each_string(np, "st,pins", prop, group) {
			(*map)[index].type = PIN_MAP_TYPE_MUX_GROUP;
			(*map)[index].data.mux.group = group;
			(*map)[index].data.mux.function = function;
			index++;
		}
	}

	*num_maps = count;

	return 0;
}

void spear_pinctrl_dt_free_map(struct pinctrl_dev *pctldev,
		struct pinctrl_map *map, unsigned num_maps)
{
	kfree(map);
}

static struct pinctrl_ops spear_pinctrl_ops = {
	.get_groups_count = spear_pinctrl_get_groups_cnt,
	.get_group_name = spear_pinctrl_get_group_name,
	.get_group_pins = spear_pinctrl_get_group_pins,
	.pin_dbg_show = spear_pinctrl_pin_dbg_show,
	.dt_node_to_map = spear_pinctrl_dt_node_to_map,
	.dt_free_map = spear_pinctrl_dt_free_map,
};

static int spear_pinctrl_get_funcs_count(struct pinctrl_dev *pctldev)
{
	struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);

	return pmx->machdata->nfunctions;
}

static const char *spear_pinctrl_get_func_name(struct pinctrl_dev *pctldev,
		unsigned function)
{
	struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);

	return pmx->machdata->functions[function]->name;
}

static int spear_pinctrl_get_func_groups(struct pinctrl_dev *pctldev,
		unsigned function, const char *const **groups,
		unsigned * const ngroups)
{
	struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);

	*groups = pmx->machdata->functions[function]->groups;
	*ngroups = pmx->machdata->functions[function]->ngroups;

	return 0;
}

static int spear_pinctrl_endisable(struct pinctrl_dev *pctldev,
		unsigned function, unsigned group, bool enable)
{
	struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
	const struct spear_pingroup *pgroup;
	const struct spear_modemux *modemux;
	struct spear_muxreg *muxreg;
	u32 val, temp;
	int i, j;
	bool found = false;

	pgroup = pmx->machdata->groups[group];

	for (i = 0; i < pgroup->nmodemuxs; i++) {
		modemux = &pgroup->modemuxs[i];

		/* SoC have any modes */
		if (pmx->machdata->modes_supported) {
			if (!(pmx->machdata->mode & modemux->modes))
				continue;
		}

		found = true;
		for (j = 0; j < modemux->nmuxregs; j++) {
			muxreg = &modemux->muxregs[j];

			val = pmx_readl(pmx, muxreg->reg);
			val &= ~muxreg->mask;

			if (enable)
				temp = muxreg->val;
			else
				temp = ~muxreg->val;

			val |= temp;
			pmx_writel(pmx, val, muxreg->reg);
		}
	}

	if (!found) {
		dev_err(pmx->dev, "pinmux group: %s not supported\n",
				pgroup->name);
		return -ENODEV;
	}

	return 0;
}

static int spear_pinctrl_enable(struct pinctrl_dev *pctldev, unsigned function,
		unsigned group)
{
	return spear_pinctrl_endisable(pctldev, function, group, true);
}

static void spear_pinctrl_disable(struct pinctrl_dev *pctldev,
		unsigned function, unsigned group)
{
	spear_pinctrl_endisable(pctldev, function, group, false);
}

static struct pinmux_ops spear_pinmux_ops = {
	.get_functions_count = spear_pinctrl_get_funcs_count,
	.get_function_name = spear_pinctrl_get_func_name,
	.get_function_groups = spear_pinctrl_get_func_groups,
	.enable = spear_pinctrl_enable,
	.disable = spear_pinctrl_disable,
};

static struct pinctrl_desc spear_pinctrl_desc = {
	.name = DRIVER_NAME,
	.pctlops = &spear_pinctrl_ops,
	.pmxops = &spear_pinmux_ops,
	.owner = THIS_MODULE,
};

int __devinit spear_pinctrl_probe(struct platform_device *pdev,
		struct spear_pinctrl_machdata *machdata)
{
	struct device_node *np = pdev->dev.of_node;
	struct resource *res;
	struct spear_pmx *pmx;

	if (!machdata)
		return -ENODEV;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res)
		return -EINVAL;

	pmx = devm_kzalloc(&pdev->dev, sizeof(*pmx), GFP_KERNEL);
	if (!pmx) {
		dev_err(&pdev->dev, "Can't alloc spear_pmx\n");
		return -ENOMEM;
	}

	pmx->vbase = devm_ioremap(&pdev->dev, res->start, resource_size(res));
	if (!pmx->vbase) {
		dev_err(&pdev->dev, "Couldn't ioremap at index 0\n");
		return -ENODEV;
	}

	pmx->dev = &pdev->dev;
	pmx->machdata = machdata;

	/* configure mode, if supported by SoC */
	if (machdata->modes_supported) {
		int mode = 0;

		if (of_property_read_u32(np, "st,pinmux-mode", &mode)) {
			dev_err(&pdev->dev, "OF: pinmux mode not passed\n");
			return -EINVAL;
		}

		if (set_mode(pmx, mode)) {
			dev_err(&pdev->dev, "OF: Couldn't configure mode: %x\n",
					mode);
			return -EINVAL;
		}
	}

	platform_set_drvdata(pdev, pmx);

	spear_pinctrl_desc.pins = machdata->pins;
	spear_pinctrl_desc.npins = machdata->npins;

	pmx->pctl = pinctrl_register(&spear_pinctrl_desc, &pdev->dev, pmx);
	if (!pmx->pctl) {
		dev_err(&pdev->dev, "Couldn't register pinctrl driver\n");
		return -ENODEV;
	}

	return 0;
}

int __devexit spear_pinctrl_remove(struct platform_device *pdev)
{
	struct spear_pmx *pmx = platform_get_drvdata(pdev);

	pinctrl_unregister(pmx->pctl);

	return 0;
}
Commit	Line	Data
deda8287 VK	1	/*
	2	* Driver for the ST Microelectronics SPEAr pinmux
	3	*
	4	* Copyright (C) 2012 ST Microelectronics
10d8935f	5	* Viresh Kumar <viresh.linux@gmail.com>
deda8287 VK	6	*
	7	* Inspired from:
	8	* - U300 Pinctl drivers
	9	* - Tegra Pinctl drivers
	10	*
	11	* This file is licensed under the terms of the GNU General Public
	12	* License version 2. This program is licensed "as is" without any
	13	* warranty of any kind, whether express or implied.
	14	*/
	15
	16	#include <linux/err.h>
	17	#include <linux/io.h>
	18	#include <linux/module.h>
	19	#include <linux/of.h>
	20	#include <linux/of_address.h>
	21	#include <linux/pinctrl/machine.h>
	22	#include <linux/pinctrl/pinctrl.h>
	23	#include <linux/pinctrl/pinmux.h>
	24	#include <linux/platform_device.h>
	25	#include <linux/slab.h>
	26
	27	#include "pinctrl-spear.h"
	28
	29	#define DRIVER_NAME "spear-pinmux"
	30
	31	static inline u32 pmx_readl(struct spear_pmx *pmx, u32 reg)
	32	{
	33	return readl_relaxed(pmx->vbase + reg);
	34	}
	35
	36	static inline void pmx_writel(struct spear_pmx *pmx, u32 val, u32 reg)
	37	{
	38	writel_relaxed(val, pmx->vbase + reg);
	39	}
	40
	41	static int set_mode(struct spear_pmx *pmx, int mode)
	42	{
	43	struct spear_pmx_mode *pmx_mode = NULL;
	44	int i;
	45	u32 val;
	46
	47	if (!pmx->machdata->pmx_modes \|\| !pmx->machdata->npmx_modes)
	48	return -EINVAL;
	49
	50	for (i = 0; i < pmx->machdata->npmx_modes; i++) {
	51	if (pmx->machdata->pmx_modes[i]->mode == (1 << mode)) {
	52	pmx_mode = pmx->machdata->pmx_modes[i];
	53	break;
	54	}
	55	}
	56
	57	if (!pmx_mode)
	58	return -EINVAL;
	59
	60	val = pmx_readl(pmx, pmx_mode->reg);
	61	val &= ~pmx_mode->mask;
	62	val \|= pmx_mode->val;
	63	pmx_writel(pmx, val, pmx_mode->reg);
	64
	65	pmx->machdata->mode = pmx_mode->mode;
	66	dev_info(pmx->dev, "Configured Mode: %s with id: %x\n\n",
	67	pmx_mode->name ? pmx_mode->name : "no_name",
	68	pmx_mode->reg);
	69
70	return 0;
71	}
72
73	void __devinit pmx_init_addr(struct spear_pinctrl_machdata *machdata, u16 reg)
74	{
75	struct spear_pingroup *pgroup;
76	struct spear_modemux *modemux;
77	int i, j, group;
78
79	for (group = 0; group < machdata->ngroups; group++) {
80	pgroup = machdata->groups[group];
81
82	for (i = 0; i < pgroup->nmodemuxs; i++) {
83	modemux = &pgroup->modemuxs[i];
84
85	for (j = 0; j < modemux->nmuxregs; j++)
86	if (modemux->muxregs[j].reg == 0xFFFF)
87	modemux->muxregs[j].reg = reg;
88	}
89	}
90	}
91
92	static int spear_pinctrl_get_groups_cnt(struct pinctrl_dev *pctldev)
93	{
94	struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
95
96	return pmx->machdata->ngroups;
97	}
98
99	static const char spear_pinctrl_get_group_name(struct pinctrl_dev pctldev,
100	unsigned group)
101	{
102	struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
103
104	return pmx->machdata->groups[group]->name;
105	}
106
107	static int spear_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
108	unsigned group, const unsigned *pins, unsigned num_pins)
109	{
110	struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
111
112	*pins = pmx->machdata->groups[group]->pins;
113	*num_pins = pmx->machdata->groups[group]->npins;
114
115	return 0;
116	}
117
118	static void spear_pinctrl_pin_dbg_show(struct pinctrl_dev *pctldev,
119	struct seq_file *s, unsigned offset)
120	{
121	seq_printf(s, " " DRIVER_NAME);
122	}
123
124	int spear_pinctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
125	struct device_node *np_config,
126	struct pinctrl_map *map, unsigned num_maps)
127	{
128	struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
129	struct device_node *np;
130	struct property *prop;
131	const char function, group;
132	int ret, index = 0, count = 0;
133
134	/* calculate number of maps required */
135	for_each_child_of_node(np_config, np) {
136	ret = of_property_read_string(np, "st,function", &function);
137	if (ret < 0)
138	return ret;
139
140	ret = of_property_count_strings(np, "st,pins");
141	if (ret < 0)
142	return ret;
143
144	count += ret;
145	}
146
147	if (!count) {
148	dev_err(pmx->dev, "No child nodes passed via DT\n");
149	return -ENODEV;
150	}
151
152	map = kzalloc(sizeof(map) count, GFP_KERNEL);
153	if (!*map)
154	return -ENOMEM;
155
156	for_each_child_of_node(np_config, np) {
157	of_property_read_string(np, "st,function", &function);
158	of_property_for_each_string(np, "st,pins", prop, group) {
159	(*map)[index].type = PIN_MAP_TYPE_MUX_GROUP;
160	(*map)[index].data.mux.group = group;
161	(*map)[index].data.mux.function = function;
162	index++;
163	}
164	}
165
166	*num_maps = count;
167
168	return 0;
169	}
170
171	void spear_pinctrl_dt_free_map(struct pinctrl_dev *pctldev,
172	struct pinctrl_map *map, unsigned num_maps)
173	{
174	kfree(map);
175	}
176
177	static struct pinctrl_ops spear_pinctrl_ops = {
178	.get_groups_count = spear_pinctrl_get_groups_cnt,
179	.get_group_name = spear_pinctrl_get_group_name,
180	.get_group_pins = spear_pinctrl_get_group_pins,
181	.pin_dbg_show = spear_pinctrl_pin_dbg_show,
182	.dt_node_to_map = spear_pinctrl_dt_node_to_map,
183	.dt_free_map = spear_pinctrl_dt_free_map,
184	};
185
186	static int spear_pinctrl_get_funcs_count(struct pinctrl_dev *pctldev)
187	{
188	struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
189
190	return pmx->machdata->nfunctions;
191	}
192
193	static const char spear_pinctrl_get_func_name(struct pinctrl_dev pctldev,
194	unsigned function)
195	{
196	struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
197
198	return pmx->machdata->functions[function]->name;
199	}
200
201	static int spear_pinctrl_get_func_groups(struct pinctrl_dev *pctldev,
202	unsigned function, const char const *groups,
203	unsigned * const ngroups)
204	{
205	struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
206
207	*groups = pmx->machdata->functions[function]->groups;
208	*ngroups = pmx->machdata->functions[function]->ngroups;
209
210	return 0;
211	}
212
213	static int spear_pinctrl_endisable(struct pinctrl_dev *pctldev,
214	unsigned function, unsigned group, bool enable)
215	{
216	struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
217	const struct spear_pingroup *pgroup;
218	const struct spear_modemux *modemux;
219	struct spear_muxreg *muxreg;
220	u32 val, temp;
221	int i, j;
222	bool found = false;
223
224	pgroup = pmx->machdata->groups[group];
225
226	for (i = 0; i < pgroup->nmodemuxs; i++) {
227	modemux = &pgroup->modemuxs[i];
228
229	/* SoC have any modes */
230	if (pmx->machdata->modes_supported) {
231	if (!(pmx->machdata->mode & modemux->modes))
232	continue;
233	}
234
235	found = true;
236	for (j = 0; j < modemux->nmuxregs; j++) {
237	muxreg = &modemux->muxregs[j];
238
239	val = pmx_readl(pmx, muxreg->reg);
240	val &= ~muxreg->mask;
241
242	if (enable)
243	temp = muxreg->val;
244	else
245	temp = ~muxreg->val;
246
247	val \|= temp;
248	pmx_writel(pmx, val, muxreg->reg);
249	}
250	}
251
252	if (!found) {
253	dev_err(pmx->dev, "pinmux group: %s not supported\n",
254	pgroup->name);
255	return -ENODEV;
256	}
257
258	return 0;
259	}
260
261	static int spear_pinctrl_enable(struct pinctrl_dev *pctldev, unsigned function,
262	unsigned group)
263	{
264	return spear_pinctrl_endisable(pctldev, function, group, true);
265	}
266
267	static void spear_pinctrl_disable(struct pinctrl_dev *pctldev,
268	unsigned function, unsigned group)
269	{
270	spear_pinctrl_endisable(pctldev, function, group, false);
271	}
272
273	static struct pinmux_ops spear_pinmux_ops = {
274	.get_functions_count = spear_pinctrl_get_funcs_count,
275	.get_function_name = spear_pinctrl_get_func_name,
276	.get_function_groups = spear_pinctrl_get_func_groups,
277	.enable = spear_pinctrl_enable,
278	.disable = spear_pinctrl_disable,
279	};
280
281	static struct pinctrl_desc spear_pinctrl_desc = {
282	.name = DRIVER_NAME,
283	.pctlops = &spear_pinctrl_ops,
284	.pmxops = &spear_pinmux_ops,
285	.owner = THIS_MODULE,
286	};
287
288	int __devinit spear_pinctrl_probe(struct platform_device *pdev,
289	struct spear_pinctrl_machdata *machdata)
290	{
291	struct device_node *np = pdev->dev.of_node;
292	struct resource *res;
293	struct spear_pmx *pmx;
294
295	if (!machdata)
296	return -ENODEV;
297
298	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
299	if (!res)
300	return -EINVAL;
301
302	pmx = devm_kzalloc(&pdev->dev, sizeof(*pmx), GFP_KERNEL);
303	if (!pmx) {
304	dev_err(&pdev->dev, "Can't alloc spear_pmx\n");
305	return -ENOMEM;
306	}
307
308	pmx->vbase = devm_ioremap(&pdev->dev, res->start, resource_size(res));
309	if (!pmx->vbase) {
310	dev_err(&pdev->dev, "Couldn't ioremap at index 0\n");
311	return -ENODEV;
312	}
313
314	pmx->dev = &pdev->dev;
315	pmx->machdata = machdata;
316
317	/* configure mode, if supported by SoC */
318	if (machdata->modes_supported) {
319	int mode = 0;
320
321	if (of_property_read_u32(np, "st,pinmux-mode", &mode)) {
322	dev_err(&pdev->dev, "OF: pinmux mode not passed\n");
323	return -EINVAL;
324	}
325
326	if (set_mode(pmx, mode)) {
327	dev_err(&pdev->dev, "OF: Couldn't configure mode: %x\n",
328	mode);
329	return -EINVAL;
330	}
331	}
332
333	platform_set_drvdata(pdev, pmx);
334
335	spear_pinctrl_desc.pins = machdata->pins;
336	spear_pinctrl_desc.npins = machdata->npins;
337
338	pmx->pctl = pinctrl_register(&spear_pinctrl_desc, &pdev->dev, pmx);
8003ae33	339	if (!pmx->pctl) {
deda8287	340	dev_err(&pdev->dev, "Couldn't register pinctrl driver\n");
8003ae33	341	return -ENODEV;
deda8287 VK	342	}
	343
	344	return 0;
	345	}
	346
	347	int __devexit spear_pinctrl_remove(struct platform_device *pdev)
	348	{
	349	struct spear_pmx *pmx = platform_get_drvdata(pdev);
	350
	351	pinctrl_unregister(pmx->pctl);
	352
	353	return 0;
	354	}