[deliverable/linux.git] / arch / sh / kernel / gpio.c

/*
 * Pinmuxed GPIO support for SuperH.
 *
 * Copyright (C) 2008 Magnus Damm
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 */

#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/bitops.h>
#include <linux/gpio.h>

static struct pinmux_info *registered_gpio;

static struct pinmux_info *gpio_controller(unsigned gpio)
{
	if (!registered_gpio)
		return NULL;

	if (gpio < registered_gpio->first_gpio)
		return NULL;

	if (gpio > registered_gpio->last_gpio)
		return NULL;

	return registered_gpio;
}

static int enum_in_range(pinmux_enum_t enum_id, struct pinmux_range *r)
{
	if (enum_id < r->begin)
		return 0;

	if (enum_id > r->end)
		return 0;

	return 1;
}

static int read_write_reg(unsigned long reg, unsigned long reg_width,
			  unsigned long field_width, unsigned long in_pos,
			  unsigned long value, int do_write)
{
	unsigned long data, mask, pos;

	data = 0;
	mask = (1 << field_width) - 1;
	pos = reg_width - ((in_pos + 1) * field_width);

#ifdef DEBUG
	pr_info("%s, addr = %lx, value = %ld, pos = %ld, "
		"r_width = %ld, f_width = %ld\n",
		do_write ? "write" : "read", reg, value, pos,
		reg_width, field_width);
#endif

	switch (reg_width) {
	case 8:
		data = ctrl_inb(reg);
		break;
	case 16:
		data = ctrl_inw(reg);
		break;
	case 32:
		data = ctrl_inl(reg);
		break;
	}

	if (!do_write)
		return (data >> pos) & mask;

	data &= ~(mask << pos);
	data |= value << pos;

	switch (reg_width) {
	case 8:
		ctrl_outb(data, reg);
		break;
	case 16:
		ctrl_outw(data, reg);
		break;
	case 32:
		ctrl_outl(data, reg);
		break;
	}
	return 0;
}

static int get_data_reg(struct pinmux_info *gpioc, unsigned gpio,
			struct pinmux_data_reg **drp, int *bitp)
{
	pinmux_enum_t enum_id = gpioc->gpios[gpio].enum_id;
	struct pinmux_data_reg *data_reg;
	int k, n;

	if (!enum_in_range(enum_id, &gpioc->data))
		return -1;

	k = 0;
	while (1) {
		data_reg = gpioc->data_regs + k;

		if (!data_reg->reg_width)
			break;

		for (n = 0; n < data_reg->reg_width; n++) {
			if (data_reg->enum_ids[n] == enum_id) {
				*drp = data_reg;
				*bitp = n;
				return 0;

			}
		}
		k++;
	}

	return -1;
}

static int get_config_reg(struct pinmux_info *gpioc, pinmux_enum_t enum_id,
			  struct pinmux_cfg_reg **crp, int *indexp,
			  unsigned long **cntp)
{
	struct pinmux_cfg_reg *config_reg;
	unsigned long r_width, f_width;
	int k, n;

	k = 0;
	while (1) {
		config_reg = gpioc->cfg_regs + k;

		r_width = config_reg->reg_width;
		f_width = config_reg->field_width;

		if (!r_width)
			break;
		for (n = 0; n < (r_width / f_width) * 1 << f_width; n++) {
			if (config_reg->enum_ids[n] == enum_id) {
				*crp = config_reg;
				*indexp = n;
				*cntp = &config_reg->cnt[n / (1 << f_width)];
				return 0;
			}
		}
		k++;
	}

	return -1;
}

static int get_gpio_enum_id(struct pinmux_info *gpioc, unsigned gpio,
			    int pos, pinmux_enum_t *enum_idp)
{
	pinmux_enum_t enum_id = gpioc->gpios[gpio].enum_id;
	pinmux_enum_t *data = gpioc->gpio_data;
	int k;

	if (!enum_in_range(enum_id, &gpioc->data)) {
		if (!enum_in_range(enum_id, &gpioc->mark)) {
			pr_err("non data/mark enum_id for gpio %d\n", gpio);
			return -1;
		}
	}

	if (pos) {
		*enum_idp = data[pos + 1];
		return pos + 1;
	}

	for (k = 0; k < gpioc->gpio_data_size; k++) {
		if (data[k] == enum_id) {
			*enum_idp = data[k + 1];
			return k + 1;
		}
	}

	pr_err("cannot locate data/mark enum_id for gpio %d\n", gpio);
	return -1;
}

static int write_config_reg(struct pinmux_info *gpioc,
			    struct pinmux_cfg_reg *crp,
			    int index)
{
	unsigned long ncomb, pos, value;

	ncomb = 1 << crp->field_width;
	pos = index / ncomb;
	value = index % ncomb;

	return read_write_reg(crp->reg, crp->reg_width,
			      crp->field_width, pos, value, 1);
}

static int check_config_reg(struct pinmux_info *gpioc,
			    struct pinmux_cfg_reg *crp,
			    int index)
{
	unsigned long ncomb, pos, value;

	ncomb = 1 << crp->field_width;
	pos = index / ncomb;
	value = index % ncomb;

	if (read_write_reg(crp->reg, crp->reg_width,
			   crp->field_width, pos, 0, 0) == value)
		return 0;

	return -1;
}

enum { GPIO_CFG_DRYRUN, GPIO_CFG_REQ, GPIO_CFG_FREE };

int pinmux_config_gpio(struct pinmux_info *gpioc, unsigned gpio,
		       int pinmux_type, int cfg_mode)
{
	struct pinmux_cfg_reg *cr = NULL;
	pinmux_enum_t enum_id;
	struct pinmux_range *range;
	int in_range, pos, index;
	unsigned long *cntp;

	switch (pinmux_type) {

	case PINMUX_TYPE_FUNCTION:
		range = NULL;
		break;

	case PINMUX_TYPE_OUTPUT:
		range = &gpioc->output;
		break;

	case PINMUX_TYPE_INPUT:
		range = &gpioc->input;
		break;

	case PINMUX_TYPE_INPUT_PULLUP:
		range = &gpioc->input_pu;
		break;

	case PINMUX_TYPE_INPUT_PULLDOWN:
		range = &gpioc->input_pd;
		break;

	default:
		goto out_err;
	}

	pos = 0;
	enum_id = 0;
	index = 0;
	while (1) {
		pos = get_gpio_enum_id(gpioc, gpio, pos, &enum_id);
		if (pos <= 0)
			goto out_err;

		if (!enum_id)
			break;

		in_range = enum_in_range(enum_id, &gpioc->function);
		if (!in_range && range)
			in_range = enum_in_range(enum_id, range);

		if (!in_range)
			continue;

		if (get_config_reg(gpioc, enum_id, &cr, &index, &cntp) != 0)
			goto out_err;

		switch (cfg_mode) {
		case GPIO_CFG_DRYRUN:
			if (!*cntp || !check_config_reg(gpioc, cr, index))
				continue;
			break;

		case GPIO_CFG_REQ:
			if (write_config_reg(gpioc, cr, index) != 0)
				goto out_err;
			*cntp = *cntp + 1;
			break;

		case GPIO_CFG_FREE:
			*cntp = *cntp - 1;
			break;
		}
	}

	return 0;
 out_err:
	return -1;
}

static DEFINE_SPINLOCK(gpio_lock);

int __gpio_request(unsigned gpio)
{
	struct pinmux_info *gpioc = gpio_controller(gpio);
	struct pinmux_data_reg *dummy;
	unsigned long flags;
	int i, ret, pinmux_type;

	ret = -EINVAL;

	if (!gpioc)
		goto err_out;

	spin_lock_irqsave(&gpio_lock, flags);

	if ((gpioc->gpios[gpio].flags & PINMUX_FLAG_TYPE) != PINMUX_TYPE_NONE)
		goto err_unlock;

	/* setup pin function here if no data is associated with pin */

	if (get_data_reg(gpioc, gpio, &dummy, &i) != 0)
		pinmux_type = PINMUX_TYPE_FUNCTION;
	else
		pinmux_type = PINMUX_TYPE_GPIO;

	if (pinmux_type == PINMUX_TYPE_FUNCTION) {
		if (pinmux_config_gpio(gpioc, gpio,
				       pinmux_type,
				       GPIO_CFG_DRYRUN) != 0)
			goto err_unlock;

		if (pinmux_config_gpio(gpioc, gpio,
				       pinmux_type,
				       GPIO_CFG_REQ) != 0)
			BUG();
	}

	gpioc->gpios[gpio].flags = pinmux_type;

	ret = 0;
 err_unlock:
	spin_unlock_irqrestore(&gpio_lock, flags);
 err_out:
	return ret;
}
EXPORT_SYMBOL(__gpio_request);

void gpio_free(unsigned gpio)
{
	struct pinmux_info *gpioc = gpio_controller(gpio);
	unsigned long flags;
	int pinmux_type;

	if (!gpioc)
		return;

	spin_lock_irqsave(&gpio_lock, flags);

	pinmux_type = gpioc->gpios[gpio].flags & PINMUX_FLAG_TYPE;
	pinmux_config_gpio(gpioc, gpio, pinmux_type, GPIO_CFG_FREE);
	gpioc->gpios[gpio].flags = PINMUX_TYPE_NONE;

	spin_unlock_irqrestore(&gpio_lock, flags);
}
EXPORT_SYMBOL(gpio_free);

static int pinmux_direction(struct pinmux_info *gpioc,
			    unsigned gpio, int new_pinmux_type)
{
	int ret, pinmux_type;

	ret = -EINVAL;
	pinmux_type = gpioc->gpios[gpio].flags & PINMUX_FLAG_TYPE;

	switch (pinmux_type) {
	case PINMUX_TYPE_GPIO:
		break;
	case PINMUX_TYPE_OUTPUT:
	case PINMUX_TYPE_INPUT:
	case PINMUX_TYPE_INPUT_PULLUP:
	case PINMUX_TYPE_INPUT_PULLDOWN:
		pinmux_config_gpio(gpioc, gpio, pinmux_type, GPIO_CFG_FREE);
		break;
	default:
		goto err_out;
	}

	if (pinmux_config_gpio(gpioc, gpio,
			       new_pinmux_type,
			       GPIO_CFG_DRYRUN) != 0)
		goto err_out;

	if (pinmux_config_gpio(gpioc, gpio,
			       new_pinmux_type,
			       GPIO_CFG_REQ) != 0)
		BUG();

	gpioc->gpios[gpio].flags = new_pinmux_type;

	ret = 0;
 err_out:
	return ret;
}

int gpio_direction_input(unsigned gpio)
{
	struct pinmux_info *gpioc = gpio_controller(gpio);
	unsigned long flags;
	int ret = -EINVAL;

	if (!gpioc)
		goto err_out;

	spin_lock_irqsave(&gpio_lock, flags);
	ret = pinmux_direction(gpioc, gpio, PINMUX_TYPE_INPUT);
	spin_unlock_irqrestore(&gpio_lock, flags);
 err_out:
	return ret;
}
EXPORT_SYMBOL(gpio_direction_input);

static int __gpio_get_set_value(struct pinmux_info *gpioc,
				unsigned gpio, int value,
				int do_write)
{
	struct pinmux_data_reg *dr = NULL;
	int bit = 0;

	if (get_data_reg(gpioc, gpio, &dr, &bit) != 0)
		BUG();
	else
		value = read_write_reg(dr->reg, dr->reg_width,
				       1, bit, value, do_write);

	return value;
}

int gpio_direction_output(unsigned gpio, int value)
{
	struct pinmux_info *gpioc = gpio_controller(gpio);
	unsigned long flags;
	int ret = -EINVAL;

	if (!gpioc)
		goto err_out;

	spin_lock_irqsave(&gpio_lock, flags);
	__gpio_get_set_value(gpioc, gpio, value, 1);
	ret = pinmux_direction(gpioc, gpio, PINMUX_TYPE_OUTPUT);
	spin_unlock_irqrestore(&gpio_lock, flags);
 err_out:
	return ret;
}
EXPORT_SYMBOL(gpio_direction_output);

int gpio_get_value(unsigned gpio)
{
	struct pinmux_info *gpioc = gpio_controller(gpio);
	unsigned long flags;
	int value = 0;

	if (!gpioc)
		BUG();
	else {
		spin_lock_irqsave(&gpio_lock, flags);
		value = __gpio_get_set_value(gpioc, gpio, 0, 0);
		spin_unlock_irqrestore(&gpio_lock, flags);
	}

	return value;
}
EXPORT_SYMBOL(gpio_get_value);

void gpio_set_value(unsigned gpio, int value)
{
	struct pinmux_info *gpioc = gpio_controller(gpio);
	unsigned long flags;

	if (!gpioc)
		BUG();
	else {
		spin_lock_irqsave(&gpio_lock, flags);
		__gpio_get_set_value(gpioc, gpio, value, 1);
		spin_unlock_irqrestore(&gpio_lock, flags);
	}
}
EXPORT_SYMBOL(gpio_set_value);

int register_pinmux(struct pinmux_info *pip)
{
	registered_gpio = pip;
	pr_info("pinmux: %s handling gpio %d -> %d\n",
		pip->name, pip->first_gpio, pip->last_gpio);

	return 0;
}
Commit	Line	Data
2967dab1 MD	1	/*
	2	* Pinmuxed GPIO support for SuperH.
	3	*
	4	* Copyright (C) 2008 Magnus Damm
	5	*
	6	* This file is subject to the terms and conditions of the GNU General Public
	7	* License. See the file "COPYING" in the main directory of this archive
	8	* for more details.
	9	*/
	10
	11	#include <linux/errno.h>
	12	#include <linux/kernel.h>
	13	#include <linux/list.h>
	14	#include <linux/module.h>
	15	#include <linux/clk.h>
	16	#include <linux/err.h>
	17	#include <linux/io.h>
	18	#include <linux/irq.h>
	19	#include <linux/bitops.h>
	20	#include <linux/gpio.h>
	21
	22	static struct pinmux_info *registered_gpio;
	23
	24	static struct pinmux_info *gpio_controller(unsigned gpio)
	25	{
	26	if (!registered_gpio)
	27	return NULL;
	28
	29	if (gpio < registered_gpio->first_gpio)
	30	return NULL;
	31
	32	if (gpio > registered_gpio->last_gpio)
	33	return NULL;
	34
	35	return registered_gpio;
	36	}
	37
	38	static int enum_in_range(pinmux_enum_t enum_id, struct pinmux_range *r)
	39	{
	40	if (enum_id < r->begin)
	41	return 0;
	42
	43	if (enum_id > r->end)
	44	return 0;
	45
	46	return 1;
	47	}
	48
	49	static int read_write_reg(unsigned long reg, unsigned long reg_width,
	50	unsigned long field_width, unsigned long in_pos,
	51	unsigned long value, int do_write)
	52	{
	53	unsigned long data, mask, pos;
	54
	55	data = 0;
	56	mask = (1 << field_width) - 1;
	57	pos = reg_width - ((in_pos + 1) * field_width);
	58
	59	#ifdef DEBUG
	60	pr_info("%s, addr = %lx, value = %ld, pos = %ld, "
	61	"r_width = %ld, f_width = %ld\n",
	62	do_write ? "write" : "read", reg, value, pos,
	63	reg_width, field_width);
	64	#endif
65
66	switch (reg_width) {
67	case 8:
68	data = ctrl_inb(reg);
69	break;
70	case 16:
71	data = ctrl_inw(reg);
72	break;
73	case 32:
74	data = ctrl_inl(reg);
75	break;
76	}
77
78	if (!do_write)
79	return (data >> pos) & mask;
80
81	data &= ~(mask << pos);
82	data \|= value << pos;
83
84	switch (reg_width) {
85	case 8:
86	ctrl_outb(data, reg);
87	break;
88	case 16:
89	ctrl_outw(data, reg);
90	break;
91	case 32:
92	ctrl_outl(data, reg);
93	break;
94	}
95	return 0;
96	}
97
98	static int get_data_reg(struct pinmux_info *gpioc, unsigned gpio,
99	struct pinmux_data_reg *drp, int bitp)
100	{
101	pinmux_enum_t enum_id = gpioc->gpios[gpio].enum_id;
102	struct pinmux_data_reg *data_reg;
103	int k, n;
104
105	if (!enum_in_range(enum_id, &gpioc->data))
106	return -1;
107
108	k = 0;
109	while (1) {
110	data_reg = gpioc->data_regs + k;
111
112	if (!data_reg->reg_width)
113	break;
114
115	for (n = 0; n < data_reg->reg_width; n++) {
116	if (data_reg->enum_ids[n] == enum_id) {
117	*drp = data_reg;
118	*bitp = n;
119	return 0;
120
121	}
122	}
123	k++;
124	}
125
126	return -1;
127	}
128
129	static int get_config_reg(struct pinmux_info *gpioc, pinmux_enum_t enum_id,
130	struct pinmux_cfg_reg *crp, int indexp,
131	unsigned long **cntp)
132	{
133	struct pinmux_cfg_reg *config_reg;
134	unsigned long r_width, f_width;
135	int k, n;
136
137	k = 0;
138	while (1) {
139	config_reg = gpioc->cfg_regs + k;
140
141	r_width = config_reg->reg_width;
142	f_width = config_reg->field_width;
143
144	if (!r_width)
145	break;
146	for (n = 0; n < (r_width / f_width) * 1 << f_width; n++) {
147	if (config_reg->enum_ids[n] == enum_id) {
148	*crp = config_reg;
149	*indexp = n;
150	*cntp = &config_reg->cnt[n / (1 << f_width)];
151	return 0;
152	}
153	}
154	k++;
155	}
156
157	return -1;
158	}
159
160	static int get_gpio_enum_id(struct pinmux_info *gpioc, unsigned gpio,
161	int pos, pinmux_enum_t *enum_idp)
162	{
163	pinmux_enum_t enum_id = gpioc->gpios[gpio].enum_id;
164	pinmux_enum_t *data = gpioc->gpio_data;
165	int k;
166
167	if (!enum_in_range(enum_id, &gpioc->data)) {
168	if (!enum_in_range(enum_id, &gpioc->mark)) {
169	pr_err("non data/mark enum_id for gpio %d\n", gpio);
170	return -1;
171	}
172	}
173
174	if (pos) {
175	*enum_idp = data[pos + 1];
176	return pos + 1;
177	}
178
179	for (k = 0; k < gpioc->gpio_data_size; k++) {
180	if (data[k] == enum_id) {
181	*enum_idp = data[k + 1];
182	return k + 1;
183	}
184	}
185
186	pr_err("cannot locate data/mark enum_id for gpio %d\n", gpio);
187	return -1;
188	}
189
190	static int write_config_reg(struct pinmux_info *gpioc,
191	struct pinmux_cfg_reg *crp,
192	int index)
193	{
194	unsigned long ncomb, pos, value;
195
196	ncomb = 1 << crp->field_width;
197	pos = index / ncomb;
198	value = index % ncomb;
199
200	return read_write_reg(crp->reg, crp->reg_width,
201	crp->field_width, pos, value, 1);
202	}
203
204	static int check_config_reg(struct pinmux_info *gpioc,
205	struct pinmux_cfg_reg *crp,
206	int index)
207	{
208	unsigned long ncomb, pos, value;
209
210	ncomb = 1 << crp->field_width;
211	pos = index / ncomb;
212	value = index % ncomb;
213
214	if (read_write_reg(crp->reg, crp->reg_width,
215	crp->field_width, pos, 0, 0) == value)
216	return 0;
217
218	return -1;
219	}
220
221	enum { GPIO_CFG_DRYRUN, GPIO_CFG_REQ, GPIO_CFG_FREE };
222
223	int pinmux_config_gpio(struct pinmux_info *gpioc, unsigned gpio,
224	int pinmux_type, int cfg_mode)
225	{
226	struct pinmux_cfg_reg *cr = NULL;
227	pinmux_enum_t enum_id;
228	struct pinmux_range *range;
229	int in_range, pos, index;
230	unsigned long *cntp;
231
232	switch (pinmux_type) {
233
234	case PINMUX_TYPE_FUNCTION:
235	range = NULL;
236	break;
237
238	case PINMUX_TYPE_OUTPUT:
239	range = &gpioc->output;
240	break;
241
242	case PINMUX_TYPE_INPUT:
243	range = &gpioc->input;
244	break;
245
246	case PINMUX_TYPE_INPUT_PULLUP:
247	range = &gpioc->input_pu;
248	break;
249
250	case PINMUX_TYPE_INPUT_PULLDOWN:
251	range = &gpioc->input_pd;
252	break;
253
254	default:
255	goto out_err;
256	}
257
258	pos = 0;
259	enum_id = 0;
260	index = 0;
261	while (1) {
262	pos = get_gpio_enum_id(gpioc, gpio, pos, &enum_id);
263	if (pos <= 0)
264	goto out_err;
265
266	if (!enum_id)
267	break;
268
269	in_range = enum_in_range(enum_id, &gpioc->function);
270	if (!in_range && range)
271	in_range = enum_in_range(enum_id, range);
272
273	if (!in_range)
274	continue;
275
276	if (get_config_reg(gpioc, enum_id, &cr, &index, &cntp) != 0)
277	goto out_err;
278
279	switch (cfg_mode) {
280	case GPIO_CFG_DRYRUN:
281	if (!*cntp \|\| !check_config_reg(gpioc, cr, index))
282	continue;
283	break;
284
285	case GPIO_CFG_REQ:
286	if (write_config_reg(gpioc, cr, index) != 0)
287	goto out_err;
288	cntp = cntp + 1;
289	break;
290
291	case GPIO_CFG_FREE:
292	cntp = cntp - 1;
293	break;
294	}
295	}
296
297	return 0;
298	out_err:
299	return -1;
300	}
301
302	static DEFINE_SPINLOCK(gpio_lock);
303
304	int __gpio_request(unsigned gpio)
305	{
306	struct pinmux_info *gpioc = gpio_controller(gpio);
307	struct pinmux_data_reg *dummy;
308	unsigned long flags;
309	int i, ret, pinmux_type;
310
311	ret = -EINVAL;
312
313	if (!gpioc)
314	goto err_out;
315
316	spin_lock_irqsave(&gpio_lock, flags);
317
318	if ((gpioc->gpios[gpio].flags & PINMUX_FLAG_TYPE) != PINMUX_TYPE_NONE)
319	goto err_unlock;
320
321	/* setup pin function here if no data is associated with pin */
322
323	if (get_data_reg(gpioc, gpio, &dummy, &i) != 0)
324	pinmux_type = PINMUX_TYPE_FUNCTION;
325	else
326	pinmux_type = PINMUX_TYPE_GPIO;
327
328	if (pinmux_type == PINMUX_TYPE_FUNCTION) {
329	if (pinmux_config_gpio(gpioc, gpio,
330	pinmux_type,
331	GPIO_CFG_DRYRUN) != 0)
332	goto err_unlock;
333
334	if (pinmux_config_gpio(gpioc, gpio,
335	pinmux_type,
336	GPIO_CFG_REQ) != 0)
337	BUG();
338	}
339
340	gpioc->gpios[gpio].flags = pinmux_type;
341
342	ret = 0;
343	err_unlock:
344	spin_unlock_irqrestore(&gpio_lock, flags);
345	err_out:
346	return ret;
347	}
348	EXPORT_SYMBOL(__gpio_request);
349
350	void gpio_free(unsigned gpio)
351	{
352	struct pinmux_info *gpioc = gpio_controller(gpio);
353	unsigned long flags;
354	int pinmux_type;
355
356	if (!gpioc)
357	return;
358
359	spin_lock_irqsave(&gpio_lock, flags);
360
361	pinmux_type = gpioc->gpios[gpio].flags & PINMUX_FLAG_TYPE;
362	pinmux_config_gpio(gpioc, gpio, pinmux_type, GPIO_CFG_FREE);
363	gpioc->gpios[gpio].flags = PINMUX_TYPE_NONE;
364
365	spin_unlock_irqrestore(&gpio_lock, flags);
366	}
367	EXPORT_SYMBOL(gpio_free);
368
369	static int pinmux_direction(struct pinmux_info *gpioc,
370	unsigned gpio, int new_pinmux_type)
371	{
372	int ret, pinmux_type;
373
374	ret = -EINVAL;
375	pinmux_type = gpioc->gpios[gpio].flags & PINMUX_FLAG_TYPE;
376
377	switch (pinmux_type) {
378	case PINMUX_TYPE_GPIO:
379	break;
380	case PINMUX_TYPE_OUTPUT:
381	case PINMUX_TYPE_INPUT:
382	case PINMUX_TYPE_INPUT_PULLUP:
383	case PINMUX_TYPE_INPUT_PULLDOWN:
384	pinmux_config_gpio(gpioc, gpio, pinmux_type, GPIO_CFG_FREE);
385	break;
386	default:
387	goto err_out;
388	}
389
390	if (pinmux_config_gpio(gpioc, gpio,
391	new_pinmux_type,
392	GPIO_CFG_DRYRUN) != 0)
393	goto err_out;
394
395	if (pinmux_config_gpio(gpioc, gpio,
396	new_pinmux_type,
397	GPIO_CFG_REQ) != 0)
398	BUG();
399
400	gpioc->gpios[gpio].flags = new_pinmux_type;
401
402	ret = 0;
403	err_out:
404	return ret;
405	}
406
407	int gpio_direction_input(unsigned gpio)
408	{
409	struct pinmux_info *gpioc = gpio_controller(gpio);
410	unsigned long flags;
411	int ret = -EINVAL;
412
413	if (!gpioc)
414	goto err_out;
415
416	spin_lock_irqsave(&gpio_lock, flags);
417	ret = pinmux_direction(gpioc, gpio, PINMUX_TYPE_INPUT);
418	spin_unlock_irqrestore(&gpio_lock, flags);
419	err_out:
420	return ret;
421	}
422	EXPORT_SYMBOL(gpio_direction_input);
423
424	static int __gpio_get_set_value(struct pinmux_info *gpioc,
425	unsigned gpio, int value,
426	int do_write)
427	{
428	struct pinmux_data_reg *dr = NULL;
429	int bit = 0;
430
431	if (get_data_reg(gpioc, gpio, &dr, &bit) != 0)
432	BUG();
433	else
434	value = read_write_reg(dr->reg, dr->reg_width,
435	1, bit, value, do_write);
436
437	return value;
438	}
439
440	int gpio_direction_output(unsigned gpio, int value)
441	{
442	struct pinmux_info *gpioc = gpio_controller(gpio);
443	unsigned long flags;
444	int ret = -EINVAL;
445
446	if (!gpioc)
447	goto err_out;
448
449	spin_lock_irqsave(&gpio_lock, flags);
450	__gpio_get_set_value(gpioc, gpio, value, 1);
451	ret = pinmux_direction(gpioc, gpio, PINMUX_TYPE_OUTPUT);
452	spin_unlock_irqrestore(&gpio_lock, flags);
453	err_out:
454	return ret;
455	}
456	EXPORT_SYMBOL(gpio_direction_output);
457
458	int gpio_get_value(unsigned gpio)
459	{
460	struct pinmux_info *gpioc = gpio_controller(gpio);
461	unsigned long flags;
462	int value = 0;
463
464	if (!gpioc)
465	BUG();
466	else {
467	spin_lock_irqsave(&gpio_lock, flags);
468	value = __gpio_get_set_value(gpioc, gpio, 0, 0);
469	spin_unlock_irqrestore(&gpio_lock, flags);
470	}
471
472	return value;
473	}
474	EXPORT_SYMBOL(gpio_get_value);
475
476	void gpio_set_value(unsigned gpio, int value)
477	{
478	struct pinmux_info *gpioc = gpio_controller(gpio);
479	unsigned long flags;
480
481	if (!gpioc)
482	BUG();
483	else {
484	spin_lock_irqsave(&gpio_lock, flags);
485	__gpio_get_set_value(gpioc, gpio, value, 1);
486	spin_unlock_irqrestore(&gpio_lock, flags);
487	}
488	}
489	EXPORT_SYMBOL(gpio_set_value);
490
491	int register_pinmux(struct pinmux_info *pip)
492	{
493	registered_gpio = pip;
494	pr_info("pinmux: %s handling gpio %d -> %d\n",
495	pip->name, pip->first_gpio, pip->last_gpio);
496
497	return 0;
498	}