[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / sh / pfc / pinctrl.c

/*
 * SuperH Pin Function Controller pinmux support.
 *
 * Copyright (C) 2012  Paul Mundt
 *
 * 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.
 */
#define DRV_NAME "pinctrl-sh_pfc"

#define pr_fmt(fmt) DRV_NAME " " KBUILD_MODNAME ": " fmt

#include <linux/init.h>
#include <linux/module.h>
#include <linux/sh_pfc.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/platform_device.h>
#include <linux/pinctrl/consumer.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/pinctrl/pinmux.h>
#include <linux/pinctrl/pinconf-generic.h>

struct sh_pfc_pinctrl {
	struct pinctrl_dev *pctl;
	struct sh_pfc *pfc;

	struct pinmux_gpio **functions;
	unsigned int nr_functions;

	struct pinctrl_pin_desc *pads;
	unsigned int nr_pads;

	spinlock_t lock;
};

static struct sh_pfc_pinctrl *sh_pfc_pmx;

static int sh_pfc_get_groups_count(struct pinctrl_dev *pctldev)
{
	struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);

	return pmx->nr_pads;
}

static const char *sh_pfc_get_group_name(struct pinctrl_dev *pctldev,
					 unsigned selector)
{
	struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);

	return pmx->pads[selector].name;
}

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

	*pins = &pmx->pads[group].number;
	*num_pins = 1;

	return 0;
}

static void sh_pfc_pin_dbg_show(struct pinctrl_dev *pctldev, struct seq_file *s,
				unsigned offset)
{
	seq_printf(s, "%s", DRV_NAME);
}

static struct pinctrl_ops sh_pfc_pinctrl_ops = {
	.get_groups_count	= sh_pfc_get_groups_count,
	.get_group_name		= sh_pfc_get_group_name,
	.get_group_pins		= sh_pfc_get_group_pins,
	.pin_dbg_show		= sh_pfc_pin_dbg_show,
};

static int sh_pfc_get_functions_count(struct pinctrl_dev *pctldev)
{
	struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);

	return pmx->nr_functions;
}

static const char *sh_pfc_get_function_name(struct pinctrl_dev *pctldev,
					    unsigned selector)
{
	struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);

	return pmx->functions[selector]->name;
}

static int sh_pfc_get_function_groups(struct pinctrl_dev *pctldev, unsigned func,
				      const char * const **groups,
				      unsigned * const num_groups)
{
	struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);

	*groups = &pmx->functions[func]->name;
	*num_groups = 1;

	return 0;
}

static int sh_pfc_noop_enable(struct pinctrl_dev *pctldev, unsigned func,
			      unsigned group)
{
	return 0;
}

static void sh_pfc_noop_disable(struct pinctrl_dev *pctldev, unsigned func,
				unsigned group)
{
}

static inline int sh_pfc_config_function(struct sh_pfc *pfc, unsigned offset)
{
	if (sh_pfc_config_gpio(pfc, offset,
			       PINMUX_TYPE_FUNCTION,
			       GPIO_CFG_DRYRUN) != 0)
		return -EINVAL;

	if (sh_pfc_config_gpio(pfc, offset,
			       PINMUX_TYPE_FUNCTION,
			       GPIO_CFG_REQ) != 0)
		return -EINVAL;

	return 0;
}

static int sh_pfc_reconfig_pin(struct sh_pfc *pfc, unsigned offset,
			       int new_type)
{
	unsigned long flags;
	int pinmux_type;
	int ret = -EINVAL;

	spin_lock_irqsave(&pfc->lock, flags);

	pinmux_type = pfc->pdata->gpios[offset].flags & PINMUX_FLAG_TYPE;

	/*
	 * See if the present config needs to first be de-configured.
	 */
	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:
		sh_pfc_config_gpio(pfc, offset, pinmux_type, GPIO_CFG_FREE);
		break;
	default:
		goto err;
	}

	/*
	 * Dry run
	 */
	if (sh_pfc_config_gpio(pfc, offset, new_type,
			       GPIO_CFG_DRYRUN) != 0)
		goto err;

	/*
	 * Request
	 */
	if (sh_pfc_config_gpio(pfc, offset, new_type,
			       GPIO_CFG_REQ) != 0)
		goto err;

	pfc->pdata->gpios[offset].flags &= ~PINMUX_FLAG_TYPE;
	pfc->pdata->gpios[offset].flags |= new_type;

	ret = 0;

err:
	spin_unlock_irqrestore(&pfc->lock, flags);

	return ret;
}


static int sh_pfc_gpio_request_enable(struct pinctrl_dev *pctldev,
				      struct pinctrl_gpio_range *range,
				      unsigned offset)
{
	struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
	struct sh_pfc *pfc = pmx->pfc;
	unsigned long flags;
	int ret, pinmux_type;

	spin_lock_irqsave(&pfc->lock, flags);

	pinmux_type = pfc->pdata->gpios[offset].flags & PINMUX_FLAG_TYPE;

	switch (pinmux_type) {
	case PINMUX_TYPE_FUNCTION:
		pr_notice_once("Use of GPIO API for function requests is "
			       "deprecated, convert to pinctrl\n");
		/* handle for now */
		ret = sh_pfc_config_function(pfc, offset);
		if (unlikely(ret < 0))
			goto err;

		break;
	case PINMUX_TYPE_GPIO:
	case PINMUX_TYPE_INPUT:
	case PINMUX_TYPE_OUTPUT:
		break;
	default:
		pr_err("Unsupported mux type (%d), bailing...\n", pinmux_type);
		ret = -ENOTSUPP;
		goto err;
	}

	ret = 0;

err:
	spin_unlock_irqrestore(&pfc->lock, flags);

	return ret;
}

static void sh_pfc_gpio_disable_free(struct pinctrl_dev *pctldev,
				     struct pinctrl_gpio_range *range,
				     unsigned offset)
{
	struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
	struct sh_pfc *pfc = pmx->pfc;
	unsigned long flags;
	int pinmux_type;

	spin_lock_irqsave(&pfc->lock, flags);

	pinmux_type = pfc->pdata->gpios[offset].flags & PINMUX_FLAG_TYPE;

	sh_pfc_config_gpio(pfc, offset, pinmux_type, GPIO_CFG_FREE);

	spin_unlock_irqrestore(&pfc->lock, flags);
}

static int sh_pfc_gpio_set_direction(struct pinctrl_dev *pctldev,
				     struct pinctrl_gpio_range *range,
				     unsigned offset, bool input)
{
	struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
	int type = input ? PINMUX_TYPE_INPUT : PINMUX_TYPE_OUTPUT;

	return sh_pfc_reconfig_pin(pmx->pfc, offset, type);
}

static struct pinmux_ops sh_pfc_pinmux_ops = {
	.get_functions_count	= sh_pfc_get_functions_count,
	.get_function_name	= sh_pfc_get_function_name,
	.get_function_groups	= sh_pfc_get_function_groups,
	.enable			= sh_pfc_noop_enable,
	.disable		= sh_pfc_noop_disable,
	.gpio_request_enable	= sh_pfc_gpio_request_enable,
	.gpio_disable_free	= sh_pfc_gpio_disable_free,
	.gpio_set_direction	= sh_pfc_gpio_set_direction,
};

static int sh_pfc_pinconf_get(struct pinctrl_dev *pctldev, unsigned pin,
			      unsigned long *config)
{
	struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
	struct sh_pfc *pfc = pmx->pfc;

	*config = pfc->pdata->gpios[pin].flags & PINMUX_FLAG_TYPE;

	return 0;
}

static int sh_pfc_pinconf_set(struct pinctrl_dev *pctldev, unsigned pin,
			      unsigned long config)
{
	struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);

	/* Validate the new type */
	if (config >= PINMUX_FLAG_TYPE)
		return -EINVAL;

	return sh_pfc_reconfig_pin(pmx->pfc, pin, config);
}

static void sh_pfc_pinconf_dbg_show(struct pinctrl_dev *pctldev,
				    struct seq_file *s, unsigned pin)
{
	const char *pinmux_type_str[] = {
		[PINMUX_TYPE_NONE]		= "none",
		[PINMUX_TYPE_FUNCTION]		= "function",
		[PINMUX_TYPE_GPIO]		= "gpio",
		[PINMUX_TYPE_OUTPUT]		= "output",
		[PINMUX_TYPE_INPUT]		= "input",
		[PINMUX_TYPE_INPUT_PULLUP]	= "input bias pull up",
		[PINMUX_TYPE_INPUT_PULLDOWN]	= "input bias pull down",
	};
	unsigned long config;
	int rc;

	rc = sh_pfc_pinconf_get(pctldev, pin, &config);
	if (unlikely(rc != 0))
		return;

	seq_printf(s, " %s", pinmux_type_str[config]);
}

static struct pinconf_ops sh_pfc_pinconf_ops = {
	.pin_config_get		= sh_pfc_pinconf_get,
	.pin_config_set		= sh_pfc_pinconf_set,
	.pin_config_dbg_show	= sh_pfc_pinconf_dbg_show,
};

static struct pinctrl_gpio_range sh_pfc_gpio_range = {
	.name		= DRV_NAME,
	.id		= 0,
};

static struct pinctrl_desc sh_pfc_pinctrl_desc = {
	.name		= DRV_NAME,
	.owner		= THIS_MODULE,
	.pctlops	= &sh_pfc_pinctrl_ops,
	.pmxops		= &sh_pfc_pinmux_ops,
	.confops	= &sh_pfc_pinconf_ops,
};

static inline void sh_pfc_map_one_gpio(struct sh_pfc *pfc,
				       struct sh_pfc_pinctrl *pmx,
				       struct pinmux_gpio *gpio,
				       unsigned offset)
{
	struct pinmux_data_reg *dummy;
	unsigned long flags;
	int bit;

	gpio->flags &= ~PINMUX_FLAG_TYPE;

	if (sh_pfc_get_data_reg(pfc, offset, &dummy, &bit) == 0)
		gpio->flags |= PINMUX_TYPE_GPIO;
	else {
		gpio->flags |= PINMUX_TYPE_FUNCTION;

		spin_lock_irqsave(&pmx->lock, flags);
		pmx->nr_functions++;
		spin_unlock_irqrestore(&pmx->lock, flags);
	}
}

/* pinmux ranges -> pinctrl pin descs */
static int sh_pfc_map_gpios(struct sh_pfc *pfc, struct sh_pfc_pinctrl *pmx)
{
	unsigned long flags;
	int i;

	pmx->nr_pads = pfc->pdata->last_gpio - pfc->pdata->first_gpio + 1;

	pmx->pads = kmalloc(sizeof(struct pinctrl_pin_desc) * pmx->nr_pads,
			    GFP_KERNEL);
	if (unlikely(!pmx->pads)) {
		pmx->nr_pads = 0;
		return -ENOMEM;
	}

	spin_lock_irqsave(&pfc->lock, flags);

	/*
	 * We don't necessarily have a 1:1 mapping between pin and linux
	 * GPIO number, as the latter maps to the associated enum_id.
	 * Care needs to be taken to translate back to pin space when
	 * dealing with any pin configurations.
	 */
	for (i = 0; i < pmx->nr_pads; i++) {
		struct pinctrl_pin_desc *pin = pmx->pads + i;
		struct pinmux_gpio *gpio = pfc->pdata->gpios + i;

		pin->number = pfc->pdata->first_gpio + i;
		pin->name = gpio->name;

		/* XXX */
		if (unlikely(!gpio->enum_id))
			continue;

		sh_pfc_map_one_gpio(pfc, pmx, gpio, i);
	}

	spin_unlock_irqrestore(&pfc->lock, flags);

	sh_pfc_pinctrl_desc.pins = pmx->pads;
	sh_pfc_pinctrl_desc.npins = pmx->nr_pads;

	return 0;
}

static int sh_pfc_map_functions(struct sh_pfc *pfc, struct sh_pfc_pinctrl *pmx)
{
	unsigned long flags;
	int i, fn;

	pmx->functions = kzalloc(pmx->nr_functions * sizeof(void *),
				 GFP_KERNEL);
	if (unlikely(!pmx->functions))
		return -ENOMEM;

	spin_lock_irqsave(&pmx->lock, flags);

	for (i = fn = 0; i < pmx->nr_pads; i++) {
		struct pinmux_gpio *gpio = pfc->pdata->gpios + i;

		if ((gpio->flags & PINMUX_FLAG_TYPE) == PINMUX_TYPE_FUNCTION)
			pmx->functions[fn++] = gpio;
	}

	spin_unlock_irqrestore(&pmx->lock, flags);

	return 0;
}

static int sh_pfc_pinctrl_probe(struct platform_device *pdev)
{
	struct sh_pfc *pfc;
	int ret;

	if (unlikely(!sh_pfc_pmx))
		return -ENODEV;

	pfc = sh_pfc_pmx->pfc;

	ret = sh_pfc_map_gpios(pfc, sh_pfc_pmx);
	if (unlikely(ret != 0))
		return ret;

	ret = sh_pfc_map_functions(pfc, sh_pfc_pmx);
	if (unlikely(ret != 0))
		goto free_pads;

	sh_pfc_pmx->pctl = pinctrl_register(&sh_pfc_pinctrl_desc, &pdev->dev,
					    sh_pfc_pmx);
	if (IS_ERR(sh_pfc_pmx->pctl)) {
		ret = PTR_ERR(sh_pfc_pmx->pctl);
		goto free_functions;
	}

	sh_pfc_gpio_range.npins = pfc->pdata->last_gpio
				- pfc->pdata->first_gpio + 1;
	sh_pfc_gpio_range.base = pfc->pdata->first_gpio;
	sh_pfc_gpio_range.pin_base = pfc->pdata->first_gpio;

	pinctrl_add_gpio_range(sh_pfc_pmx->pctl, &sh_pfc_gpio_range);

	platform_set_drvdata(pdev, sh_pfc_pmx);

	return 0;

free_functions:
	kfree(sh_pfc_pmx->functions);
free_pads:
	kfree(sh_pfc_pmx->pads);
	kfree(sh_pfc_pmx);

	return ret;
}

static int sh_pfc_pinctrl_remove(struct platform_device *pdev)
{
	struct sh_pfc_pinctrl *pmx = platform_get_drvdata(pdev);

	pinctrl_unregister(pmx->pctl);

	platform_set_drvdata(pdev, NULL);

	kfree(sh_pfc_pmx->functions);
	kfree(sh_pfc_pmx->pads);
	kfree(sh_pfc_pmx);

	return 0;
}

static struct platform_driver sh_pfc_pinctrl_driver = {
	.probe		= sh_pfc_pinctrl_probe,
	.remove		= sh_pfc_pinctrl_remove,
	.driver		= {
		.name	= DRV_NAME,
		.owner	= THIS_MODULE,
	},
};

static struct platform_device sh_pfc_pinctrl_device = {
	.name		= DRV_NAME,
	.id		= -1,
};

static int sh_pfc_pinctrl_init(void)
{
	int rc;

	rc = platform_driver_register(&sh_pfc_pinctrl_driver);
	if (likely(!rc)) {
		rc = platform_device_register(&sh_pfc_pinctrl_device);
		if (unlikely(rc))
			platform_driver_unregister(&sh_pfc_pinctrl_driver);
	}

	return rc;
}

int sh_pfc_register_pinctrl(struct sh_pfc *pfc)
{
	sh_pfc_pmx = kzalloc(sizeof(struct sh_pfc_pinctrl), GFP_KERNEL);
	if (unlikely(!sh_pfc_pmx))
		return -ENOMEM;

	spin_lock_init(&sh_pfc_pmx->lock);

	sh_pfc_pmx->pfc = pfc;

	return sh_pfc_pinctrl_init();
}
EXPORT_SYMBOL_GPL(sh_pfc_register_pinctrl);

static void __exit sh_pfc_pinctrl_exit(void)
{
	platform_driver_unregister(&sh_pfc_pinctrl_driver);
}
module_exit(sh_pfc_pinctrl_exit);
Commit	Line	Data
ca5481c6 PM	1	/*
	2	* SuperH Pin Function Controller pinmux support.
	3	*
	4	* Copyright (C) 2012 Paul Mundt
	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	*/
54407110 PM	10	#define DRV_NAME "pinctrl-sh_pfc"
	11
	12	#define pr_fmt(fmt) DRV_NAME " " KBUILD_MODNAME ": " fmt
ca5481c6 PM	13
	14	#include <linux/init.h>
	15	#include <linux/module.h>
	16	#include <linux/sh_pfc.h>
	17	#include <linux/err.h>
	18	#include <linux/slab.h>
d93a891f	19	#include <linux/spinlock.h>
ca5481c6 PM	20	#include <linux/platform_device.h>
	21	#include <linux/pinctrl/consumer.h>
	22	#include <linux/pinctrl/pinctrl.h>
	23	#include <linux/pinctrl/pinconf.h>
	24	#include <linux/pinctrl/pinmux.h>
	25	#include <linux/pinctrl/pinconf-generic.h>
	26
	27	struct sh_pfc_pinctrl {
	28	struct pinctrl_dev *pctl;
	29	struct sh_pfc *pfc;
	30
d93a891f PM	31	struct pinmux_gpio **functions;
	32	unsigned int nr_functions;
	33
ca5481c6 PM	34	struct pinctrl_pin_desc *pads;
ca5481c6 PM	35	unsigned int nr_pads;
d93a891f PM	36
d93a891f PM	37	spinlock_t lock;
ca5481c6 PM	38	};
	39
	40	static struct sh_pfc_pinctrl *sh_pfc_pmx;
	41
e3f805e8	42	static int sh_pfc_get_groups_count(struct pinctrl_dev *pctldev)
ca5481c6	43	{
e3f805e8 PM	44	struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
	45
	46	return pmx->nr_pads;
ca5481c6 PM	47	}
ca5481c6 PM	48
e3f805e8	49	static const char sh_pfc_get_group_name(struct pinctrl_dev pctldev,
ca5481c6 PM	50	unsigned selector)
ca5481c6 PM	51	{
e3f805e8 PM	52	struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
	53
	54	return pmx->pads[selector].name;
ca5481c6 PM	55	}
	56
	57	static int sh_pfc_get_group_pins(struct pinctrl_dev *pctldev, unsigned group,
	58	const unsigned *pins, unsigned num_pins)
	59	{
e3f805e8 PM	60	struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
	61
	62	*pins = &pmx->pads[group].number;
	63	*num_pins = 1;
	64
	65	return 0;
ca5481c6 PM	66	}
ca5481c6 PM	67
fdd85ec3 PM	68	static void sh_pfc_pin_dbg_show(struct pinctrl_dev pctldev, struct seq_file s,
	69	unsigned offset)
	70	{
	71	seq_printf(s, "%s", DRV_NAME);
	72	}
	73
ca5481c6	74	static struct pinctrl_ops sh_pfc_pinctrl_ops = {
e3f805e8 PM	75	.get_groups_count = sh_pfc_get_groups_count,
e3f805e8 PM	76	.get_group_name = sh_pfc_get_group_name,
ca5481c6	77	.get_group_pins = sh_pfc_get_group_pins,
fdd85ec3	78	.pin_dbg_show = sh_pfc_pin_dbg_show,
ca5481c6 PM	79	};
ca5481c6 PM	80
d93a891f PM	81	static int sh_pfc_get_functions_count(struct pinctrl_dev *pctldev)
	82	{
	83	struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
	84
	85	return pmx->nr_functions;
	86	}
	87
	88	static const char sh_pfc_get_function_name(struct pinctrl_dev pctldev,
	89	unsigned selector)
	90	{
	91	struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
	92
	93	return pmx->functions[selector]->name;
	94	}
ca5481c6	95
ca5481c6 PM	96	static int sh_pfc_get_function_groups(struct pinctrl_dev *pctldev, unsigned func,
	97	const char * const **groups,
	98	unsigned * const num_groups)
	99	{
d93a891f PM	100	struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
	101
	102	*groups = &pmx->functions[func]->name;
	103	*num_groups = 1;
	104
ca5481c6 PM	105	return 0;
	106	}
	107
	108	static int sh_pfc_noop_enable(struct pinctrl_dev *pctldev, unsigned func,
	109	unsigned group)
	110	{
	111	return 0;
	112	}
	113
	114	static void sh_pfc_noop_disable(struct pinctrl_dev *pctldev, unsigned func,
	115	unsigned group)
	116	{
	117	}
	118
d93a891f PM	119	static inline int sh_pfc_config_function(struct sh_pfc *pfc, unsigned offset)
	120	{
	121	if (sh_pfc_config_gpio(pfc, offset,
	122	PINMUX_TYPE_FUNCTION,
	123	GPIO_CFG_DRYRUN) != 0)
	124	return -EINVAL;
	125
	126	if (sh_pfc_config_gpio(pfc, offset,
	127	PINMUX_TYPE_FUNCTION,
	128	GPIO_CFG_REQ) != 0)
	129	return -EINVAL;
	130
	131	return 0;
	132	}
	133
fdd85ec3 PM	134	static int sh_pfc_reconfig_pin(struct sh_pfc *pfc, unsigned offset,
	135	int new_type)
	136	{
	137	unsigned long flags;
	138	int pinmux_type;
	139	int ret = -EINVAL;
	140
	141	spin_lock_irqsave(&pfc->lock, flags);
	142
d4e62d00	143	pinmux_type = pfc->pdata->gpios[offset].flags & PINMUX_FLAG_TYPE;
fdd85ec3 PM	144
	145	/*
	146	* See if the present config needs to first be de-configured.
	147	*/
	148	switch (pinmux_type) {
	149	case PINMUX_TYPE_GPIO:
	150	break;
	151	case PINMUX_TYPE_OUTPUT:
	152	case PINMUX_TYPE_INPUT:
	153	case PINMUX_TYPE_INPUT_PULLUP:
	154	case PINMUX_TYPE_INPUT_PULLDOWN:
	155	sh_pfc_config_gpio(pfc, offset, pinmux_type, GPIO_CFG_FREE);
	156	break;
	157	default:
	158	goto err;
	159	}
	160
	161	/*
	162	* Dry run
	163	*/
	164	if (sh_pfc_config_gpio(pfc, offset, new_type,
	165	GPIO_CFG_DRYRUN) != 0)
	166	goto err;
	167
	168	/*
	169	* Request
	170	*/
	171	if (sh_pfc_config_gpio(pfc, offset, new_type,
	172	GPIO_CFG_REQ) != 0)
	173	goto err;
	174
d4e62d00 LP	175	pfc->pdata->gpios[offset].flags &= ~PINMUX_FLAG_TYPE;
d4e62d00 LP	176	pfc->pdata->gpios[offset].flags \|= new_type;
fdd85ec3 PM	177
	178	ret = 0;
	179
	180	err:
	181	spin_unlock_irqrestore(&pfc->lock, flags);
	182
	183	return ret;
	184	}
	185
	186
ca5481c6 PM	187	static int sh_pfc_gpio_request_enable(struct pinctrl_dev *pctldev,
	188	struct pinctrl_gpio_range *range,
	189	unsigned offset)
	190	{
	191	struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
	192	struct sh_pfc *pfc = pmx->pfc;
ca5481c6	193	unsigned long flags;
d93a891f	194	int ret, pinmux_type;
ca5481c6 PM	195
	196	spin_lock_irqsave(&pfc->lock, flags);
	197
d4e62d00	198	pinmux_type = pfc->pdata->gpios[offset].flags & PINMUX_FLAG_TYPE;
ca5481c6	199
d93a891f PM	200	switch (pinmux_type) {
	201	case PINMUX_TYPE_FUNCTION:
	202	pr_notice_once("Use of GPIO API for function requests is "
	203	"deprecated, convert to pinctrl\n");
	204	/* handle for now */
	205	ret = sh_pfc_config_function(pfc, offset);
	206	if (unlikely(ret < 0))
ca5481c6	207	goto err;
ca5481c6	208
d93a891f PM	209	break;
d93a891f PM	210	case PINMUX_TYPE_GPIO:
16d74ebe PM	211	case PINMUX_TYPE_INPUT:
16d74ebe PM	212	case PINMUX_TYPE_OUTPUT:
d93a891f PM	213	break;
	214	default:
	215	pr_err("Unsupported mux type (%d), bailing...\n", pinmux_type);
077664a2 LP	216	ret = -ENOTSUPP;
077664a2 LP	217	goto err;
d93a891f	218	}
ca5481c6 PM	219
	220	ret = 0;
	221
	222	err:
	223	spin_unlock_irqrestore(&pfc->lock, flags);
	224
	225	return ret;
	226	}
	227
	228	static void sh_pfc_gpio_disable_free(struct pinctrl_dev *pctldev,
	229	struct pinctrl_gpio_range *range,
	230	unsigned offset)
	231	{
	232	struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
	233	struct sh_pfc *pfc = pmx->pfc;
	234	unsigned long flags;
	235	int pinmux_type;
	236
	237	spin_lock_irqsave(&pfc->lock, flags);
	238
d4e62d00	239	pinmux_type = pfc->pdata->gpios[offset].flags & PINMUX_FLAG_TYPE;
ca5481c6 PM	240
	241	sh_pfc_config_gpio(pfc, offset, pinmux_type, GPIO_CFG_FREE);
	242
ca5481c6 PM	243	spin_unlock_irqrestore(&pfc->lock, flags);
	244	}
	245
	246	static int sh_pfc_gpio_set_direction(struct pinctrl_dev *pctldev,
	247	struct pinctrl_gpio_range *range,
	248	unsigned offset, bool input)
	249	{
	250	struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
fdd85ec3	251	int type = input ? PINMUX_TYPE_INPUT : PINMUX_TYPE_OUTPUT;
ca5481c6	252
fdd85ec3	253	return sh_pfc_reconfig_pin(pmx->pfc, offset, type);
ca5481c6 PM	254	}
	255
	256	static struct pinmux_ops sh_pfc_pinmux_ops = {
d93a891f PM	257	.get_functions_count = sh_pfc_get_functions_count,
d93a891f PM	258	.get_function_name = sh_pfc_get_function_name,
ca5481c6 PM	259	.get_function_groups = sh_pfc_get_function_groups,
	260	.enable = sh_pfc_noop_enable,
	261	.disable = sh_pfc_noop_disable,
	262	.gpio_request_enable = sh_pfc_gpio_request_enable,
	263	.gpio_disable_free = sh_pfc_gpio_disable_free,
	264	.gpio_set_direction = sh_pfc_gpio_set_direction,
	265	};
	266
	267	static int sh_pfc_pinconf_get(struct pinctrl_dev *pctldev, unsigned pin,
	268	unsigned long *config)
	269	{
fdd85ec3 PM	270	struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
fdd85ec3 PM	271	struct sh_pfc *pfc = pmx->pfc;
d93a891f	272
d4e62d00	273	*config = pfc->pdata->gpios[pin].flags & PINMUX_FLAG_TYPE;
d93a891f	274
fdd85ec3	275	return 0;
ca5481c6 PM	276	}
	277
	278	static int sh_pfc_pinconf_set(struct pinctrl_dev *pctldev, unsigned pin,
	279	unsigned long config)
	280	{
fdd85ec3	281	struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
fdd85ec3 PM	282
	283	/* Validate the new type */
	284	if (config >= PINMUX_FLAG_TYPE)
	285	return -EINVAL;
	286
	287	return sh_pfc_reconfig_pin(pmx->pfc, pin, config);
	288	}
	289
	290	static void sh_pfc_pinconf_dbg_show(struct pinctrl_dev *pctldev,
	291	struct seq_file *s, unsigned pin)
	292	{
	293	const char *pinmux_type_str[] = {
	294	[PINMUX_TYPE_NONE] = "none",
	295	[PINMUX_TYPE_FUNCTION] = "function",
	296	[PINMUX_TYPE_GPIO] = "gpio",
	297	[PINMUX_TYPE_OUTPUT] = "output",
	298	[PINMUX_TYPE_INPUT] = "input",
	299	[PINMUX_TYPE_INPUT_PULLUP] = "input bias pull up",
	300	[PINMUX_TYPE_INPUT_PULLDOWN] = "input bias pull down",
	301	};
	302	unsigned long config;
	303	int rc;
	304
	305	rc = sh_pfc_pinconf_get(pctldev, pin, &config);
	306	if (unlikely(rc != 0))
	307	return;
	308
	309	seq_printf(s, " %s", pinmux_type_str[config]);
ca5481c6 PM	310	}
	311
	312	static struct pinconf_ops sh_pfc_pinconf_ops = {
ca5481c6 PM	313	.pin_config_get = sh_pfc_pinconf_get,
ca5481c6 PM	314	.pin_config_set = sh_pfc_pinconf_set,
fdd85ec3	315	.pin_config_dbg_show = sh_pfc_pinconf_dbg_show,
ca5481c6 PM	316	};
	317
	318	static struct pinctrl_gpio_range sh_pfc_gpio_range = {
54407110	319	.name = DRV_NAME,
ca5481c6 PM	320	.id = 0,
	321	};
	322
	323	static struct pinctrl_desc sh_pfc_pinctrl_desc = {
54407110	324	.name = DRV_NAME,
ca5481c6 PM	325	.owner = THIS_MODULE,
	326	.pctlops = &sh_pfc_pinctrl_ops,
	327	.pmxops = &sh_pfc_pinmux_ops,
	328	.confops = &sh_pfc_pinconf_ops,
	329	};
	330
0fe763c5 GKH	331	static inline void sh_pfc_map_one_gpio(struct sh_pfc *pfc,
	332	struct sh_pfc_pinctrl *pmx,
	333	struct pinmux_gpio *gpio,
	334	unsigned offset)
d93a891f PM	335	{
	336	struct pinmux_data_reg *dummy;
	337	unsigned long flags;
	338	int bit;
	339
	340	gpio->flags &= ~PINMUX_FLAG_TYPE;
	341
	342	if (sh_pfc_get_data_reg(pfc, offset, &dummy, &bit) == 0)
	343	gpio->flags \|= PINMUX_TYPE_GPIO;
	344	else {
	345	gpio->flags \|= PINMUX_TYPE_FUNCTION;
	346
	347	spin_lock_irqsave(&pmx->lock, flags);
	348	pmx->nr_functions++;
	349	spin_unlock_irqrestore(&pmx->lock, flags);
	350	}
	351	}
	352
ca5481c6	353	/* pinmux ranges -> pinctrl pin descs */
0fe763c5	354	static int sh_pfc_map_gpios(struct sh_pfc pfc, struct sh_pfc_pinctrl pmx)
ca5481c6	355	{
d93a891f	356	unsigned long flags;
ca5481c6 PM	357	int i;
ca5481c6 PM	358
d4e62d00	359	pmx->nr_pads = pfc->pdata->last_gpio - pfc->pdata->first_gpio + 1;
ca5481c6 PM	360
	361	pmx->pads = kmalloc(sizeof(struct pinctrl_pin_desc) * pmx->nr_pads,
	362	GFP_KERNEL);
	363	if (unlikely(!pmx->pads)) {
	364	pmx->nr_pads = 0;
	365	return -ENOMEM;
	366	}
	367
d93a891f PM	368	spin_lock_irqsave(&pfc->lock, flags);
d93a891f PM	369
ca5481c6 PM	370	/*
	371	* We don't necessarily have a 1:1 mapping between pin and linux
	372	* GPIO number, as the latter maps to the associated enum_id.
	373	* Care needs to be taken to translate back to pin space when
	374	* dealing with any pin configurations.
	375	*/
	376	for (i = 0; i < pmx->nr_pads; i++) {
	377	struct pinctrl_pin_desc *pin = pmx->pads + i;
d4e62d00	378	struct pinmux_gpio *gpio = pfc->pdata->gpios + i;
ca5481c6	379
d4e62d00	380	pin->number = pfc->pdata->first_gpio + i;
ca5481c6	381	pin->name = gpio->name;
d93a891f	382
e3e79454 PM	383	/* XXX */
	384	if (unlikely(!gpio->enum_id))
	385	continue;
	386
d93a891f	387	sh_pfc_map_one_gpio(pfc, pmx, gpio, i);
ca5481c6 PM	388	}
ca5481c6 PM	389
d93a891f PM	390	spin_unlock_irqrestore(&pfc->lock, flags);
d93a891f PM	391
ca5481c6 PM	392	sh_pfc_pinctrl_desc.pins = pmx->pads;
	393	sh_pfc_pinctrl_desc.npins = pmx->nr_pads;
	394
	395	return 0;
	396	}
	397
0fe763c5	398	static int sh_pfc_map_functions(struct sh_pfc pfc, struct sh_pfc_pinctrl pmx)
d93a891f PM	399	{
	400	unsigned long flags;
	401	int i, fn;
	402
	403	pmx->functions = kzalloc(pmx->nr_functions * sizeof(void *),
	404	GFP_KERNEL);
	405	if (unlikely(!pmx->functions))
	406	return -ENOMEM;
	407
	408	spin_lock_irqsave(&pmx->lock, flags);
	409
	410	for (i = fn = 0; i < pmx->nr_pads; i++) {
d4e62d00	411	struct pinmux_gpio *gpio = pfc->pdata->gpios + i;
d93a891f PM	412
	413	if ((gpio->flags & PINMUX_FLAG_TYPE) == PINMUX_TYPE_FUNCTION)
	414	pmx->functions[fn++] = gpio;
	415	}
	416
	417	spin_unlock_irqrestore(&pmx->lock, flags);
	418
	419	return 0;
	420	}
	421
0fe763c5	422	static int sh_pfc_pinctrl_probe(struct platform_device *pdev)
ca5481c6 PM	423	{
	424	struct sh_pfc *pfc;
	425	int ret;
	426
	427	if (unlikely(!sh_pfc_pmx))
	428	return -ENODEV;
	429
	430	pfc = sh_pfc_pmx->pfc;
	431
	432	ret = sh_pfc_map_gpios(pfc, sh_pfc_pmx);
	433	if (unlikely(ret != 0))
	434	return ret;
	435
d93a891f PM	436	ret = sh_pfc_map_functions(pfc, sh_pfc_pmx);
	437	if (unlikely(ret != 0))
	438	goto free_pads;
	439
ca5481c6 PM	440	sh_pfc_pmx->pctl = pinctrl_register(&sh_pfc_pinctrl_desc, &pdev->dev,
	441	sh_pfc_pmx);
	442	if (IS_ERR(sh_pfc_pmx->pctl)) {
	443	ret = PTR_ERR(sh_pfc_pmx->pctl);
d93a891f	444	goto free_functions;
ca5481c6 PM	445	}
ca5481c6 PM	446
d4e62d00 LP	447	sh_pfc_gpio_range.npins = pfc->pdata->last_gpio
	448	- pfc->pdata->first_gpio + 1;
	449	sh_pfc_gpio_range.base = pfc->pdata->first_gpio;
	450	sh_pfc_gpio_range.pin_base = pfc->pdata->first_gpio;
ca5481c6 PM	451
	452	pinctrl_add_gpio_range(sh_pfc_pmx->pctl, &sh_pfc_gpio_range);
	453
	454	platform_set_drvdata(pdev, sh_pfc_pmx);
	455
	456	return 0;
	457
d93a891f PM	458	free_functions:
	459	kfree(sh_pfc_pmx->functions);
	460	free_pads:
ca5481c6 PM	461	kfree(sh_pfc_pmx->pads);
ca5481c6 PM	462	kfree(sh_pfc_pmx);
d93a891f	463
ca5481c6 PM	464	return ret;
	465	}
	466
0fe763c5	467	static int sh_pfc_pinctrl_remove(struct platform_device *pdev)
ca5481c6 PM	468	{
	469	struct sh_pfc_pinctrl *pmx = platform_get_drvdata(pdev);
	470
ca5481c6 PM	471	pinctrl_unregister(pmx->pctl);
	472
	473	platform_set_drvdata(pdev, NULL);
	474
d93a891f	475	kfree(sh_pfc_pmx->functions);
ca5481c6 PM	476	kfree(sh_pfc_pmx->pads);
	477	kfree(sh_pfc_pmx);
	478
	479	return 0;
	480	}
	481
	482	static struct platform_driver sh_pfc_pinctrl_driver = {
	483	.probe = sh_pfc_pinctrl_probe,
0fe763c5	484	.remove = sh_pfc_pinctrl_remove,
ca5481c6	485	.driver = {
54407110	486	.name = DRV_NAME,
ca5481c6 PM	487	.owner = THIS_MODULE,
	488	},
	489	};
	490
	491	static struct platform_device sh_pfc_pinctrl_device = {
54407110	492	.name = DRV_NAME,
ca5481c6 PM	493	.id = -1,
	494	};
	495
1e32dfe3	496	static int sh_pfc_pinctrl_init(void)
ca5481c6 PM	497	{
	498	int rc;
	499
	500	rc = platform_driver_register(&sh_pfc_pinctrl_driver);
	501	if (likely(!rc)) {
	502	rc = platform_device_register(&sh_pfc_pinctrl_device);
	503	if (unlikely(rc))
	504	platform_driver_unregister(&sh_pfc_pinctrl_driver);
	505	}
	506
	507	return rc;
	508	}
	509
1e32dfe3 PM	510	int sh_pfc_register_pinctrl(struct sh_pfc *pfc)
	511	{
	512	sh_pfc_pmx = kzalloc(sizeof(struct sh_pfc_pinctrl), GFP_KERNEL);
	513	if (unlikely(!sh_pfc_pmx))
	514	return -ENOMEM;
	515
	516	spin_lock_init(&sh_pfc_pmx->lock);
	517
	518	sh_pfc_pmx->pfc = pfc;
	519
	520	return sh_pfc_pinctrl_init();
	521	}
	522	EXPORT_SYMBOL_GPL(sh_pfc_register_pinctrl);
	523
ca5481c6 PM	524	static void __exit sh_pfc_pinctrl_exit(void)
	525	{
	526	platform_driver_unregister(&sh_pfc_pinctrl_driver);
	527	}
ca5481c6	528	module_exit(sh_pfc_pinctrl_exit);