drivers/pinctrl/pinctrl-lantiq.c - linux - Git at Google

 /*
  *  linux/drivers/pinctrl/pinctrl-lantiq.c
  *  based on linux/drivers/pinctrl/pinctrl-pxa3xx.c
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License version 2 as
  *  publishhed by the Free Software Foundation.
  *
  *  Copyright (C) 2012 John Crispin <john@phrozen.org>
  */

 #include <linux/module.h>
 #include <linux/device.h>
 #include <linux/io.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/of.h>

 #include "pinctrl-lantiq.h"

 static int ltq_get_group_count(struct pinctrl_dev *pctrldev)
 {
 	struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
 	return info->num_grps;
 }

 static const char *ltq_get_group_name(struct pinctrl_dev *pctrldev,
 					 unsigned selector)
 {
 	struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
 	if (selector >= info->num_grps)
 		return NULL;
 	return info->grps[selector].name;
 }

 static int ltq_get_group_pins(struct pinctrl_dev *pctrldev,
 				 unsigned selector,
 				 const unsigned **pins,
 				 unsigned *num_pins)
 {
 	struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
 	if (selector >= info->num_grps)
 		return -EINVAL;
 	*pins = info->grps[selector].pins;
 	*num_pins = info->grps[selector].npins;
 	return 0;
 }

 static void ltq_pinctrl_dt_free_map(struct pinctrl_dev *pctldev,
 				    struct pinctrl_map *map, unsigned num_maps)
 {
 	int i;

 	for (i = 0; i < num_maps; i++)
 		if (map[i].type == PIN_MAP_TYPE_CONFIGS_PIN ||
 		    map[i].type == PIN_MAP_TYPE_CONFIGS_GROUP)
 			kfree(map[i].data.configs.configs);
 	kfree(map);
 }

 static void ltq_pinctrl_pin_dbg_show(struct pinctrl_dev *pctldev,
 					struct seq_file *s,
 					unsigned offset)
 {
 	seq_printf(s, " %s", dev_name(pctldev->dev));
 }

 static void ltq_pinctrl_dt_subnode_to_map(struct pinctrl_dev *pctldev,
 				struct device_node *np,
 				struct pinctrl_map **map)
 {
 	struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctldev);
 	struct property *pins = of_find_property(np, "lantiq,pins", NULL);
 	struct property *groups = of_find_property(np, "lantiq,groups", NULL);
 	unsigned long configs[3];
 	unsigned num_configs = 0;
 	struct property *prop;
 	const char *group, *pin;
 	const char *function;
 	int ret, i;

 	if (!pins && !groups) {
 		dev_err(pctldev->dev, "%pOFn defines neither pins nor groups\n",
 			np);
 		return;
 	}

 	if (pins && groups) {
 		dev_err(pctldev->dev, "%pOFn defines both pins and groups\n",
 			np);
 		return;
 	}

 	ret = of_property_read_string(np, "lantiq,function", &function);
 	if (groups && !ret) {
 		of_property_for_each_string(np, "lantiq,groups", prop, group) {
 			(*map)->type = PIN_MAP_TYPE_MUX_GROUP;
 			(*map)->name = function;
 			(*map)->data.mux.group = group;
 			(*map)->data.mux.function = function;
 			(*map)++;
 		}
 	}

 	for (i = 0; i < info->num_params; i++) {
 		u32 val;
 		int ret = of_property_read_u32(np,
 				info->params[i].property, &val);
 		if (!ret)
 			configs[num_configs++] =
 				LTQ_PINCONF_PACK(info->params[i].param,
 				val);
 	}

 	if (!num_configs)
 		return;

 	of_property_for_each_string(np, "lantiq,pins", prop, pin) {
 		(*map)->data.configs.configs = kmemdup(configs,
 					num_configs * sizeof(unsigned long),
 					GFP_KERNEL);
 		(*map)->type = PIN_MAP_TYPE_CONFIGS_PIN;
 		(*map)->name = pin;
 		(*map)->data.configs.group_or_pin = pin;
 		(*map)->data.configs.num_configs = num_configs;
 		(*map)++;
 	}
 	of_property_for_each_string(np, "lantiq,groups", prop, group) {
 		(*map)->data.configs.configs = kmemdup(configs,
 					num_configs * sizeof(unsigned long),
 					GFP_KERNEL);
 		(*map)->type = PIN_MAP_TYPE_CONFIGS_GROUP;
 		(*map)->name = group;
 		(*map)->data.configs.group_or_pin = group;
 		(*map)->data.configs.num_configs = num_configs;
 		(*map)++;
 	}
 }

 static int ltq_pinctrl_dt_subnode_size(struct device_node *np)
 {
 	int ret;

 	ret = of_property_count_strings(np, "lantiq,groups");
 	if (ret < 0)
 		ret = of_property_count_strings(np, "lantiq,pins");
 	return ret;
 }

 static int ltq_pinctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
 				      struct device_node *np_config,
 				      struct pinctrl_map **map,
 				      unsigned *num_maps)
 {
 	struct pinctrl_map *tmp;
 	struct device_node *np;
 	int max_maps = 0;

 	for_each_child_of_node(np_config, np)
 		max_maps += ltq_pinctrl_dt_subnode_size(np);
 	*map = kzalloc(array3_size(max_maps, sizeof(struct pinctrl_map), 2),
 		       GFP_KERNEL);
 	if (!*map)
 		return -ENOMEM;
 	tmp = *map;

 	for_each_child_of_node(np_config, np)
 		ltq_pinctrl_dt_subnode_to_map(pctldev, np, &tmp);
 	*num_maps = ((int)(tmp - *map));

 	return 0;
 }

 static const struct pinctrl_ops ltq_pctrl_ops = {
 	.get_groups_count	= ltq_get_group_count,
 	.get_group_name		= ltq_get_group_name,
 	.get_group_pins		= ltq_get_group_pins,
 	.pin_dbg_show		= ltq_pinctrl_pin_dbg_show,
 	.dt_node_to_map		= ltq_pinctrl_dt_node_to_map,
 	.dt_free_map		= ltq_pinctrl_dt_free_map,
 };

 static int ltq_pmx_func_count(struct pinctrl_dev *pctrldev)
 {
 	struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);

 	return info->num_funcs;
 }

 static const char *ltq_pmx_func_name(struct pinctrl_dev *pctrldev,
 					 unsigned selector)
 {
 	struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);

 	if (selector >= info->num_funcs)
 		return NULL;

 	return info->funcs[selector].name;
 }

 static int ltq_pmx_get_groups(struct pinctrl_dev *pctrldev,
 				unsigned func,
 				const char * const **groups,
 				unsigned * const num_groups)
 {
 	struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);

 	*groups = info->funcs[func].groups;
 	*num_groups = info->funcs[func].num_groups;

 	return 0;
 }

 /* Return function number. If failure, return negative value. */
 static int match_mux(const struct ltq_mfp_pin *mfp, unsigned mux)
 {
 	int i;
 	for (i = 0; i < LTQ_MAX_MUX; i++) {
 		if (mfp->func[i] == mux)
 			break;
 	}
 	if (i >= LTQ_MAX_MUX)
 		return -EINVAL;
 	return i;
 }

 /* dont assume .mfp is linearly mapped. find the mfp with the correct .pin */
 static int match_mfp(const struct ltq_pinmux_info *info, int pin)
 {
 	int i;
 	for (i = 0; i < info->num_mfp; i++) {
 		if (info->mfp[i].pin == pin)
 			return i;
 	}
 	return -1;
 }

 /* check whether current pin configuration is valid. Negative for failure */
 static int match_group_mux(const struct ltq_pin_group *grp,
 			   const struct ltq_pinmux_info *info,
 			   unsigned mux)
 {
 	int i, pin, ret = 0;
 	for (i = 0; i < grp->npins; i++) {
 		pin = match_mfp(info, grp->pins[i]);
 		if (pin < 0) {
 			dev_err(info->dev, "could not find mfp for pin %d\n",
 				grp->pins[i]);
 			return -EINVAL;
 		}
 		ret = match_mux(&info->mfp[pin], mux);
 		if (ret < 0) {
 			dev_err(info->dev, "Can't find mux %d on pin%d\n",
 				mux, pin);
 			break;
 		}
 	}
 	return ret;
 }

 static int ltq_pmx_set(struct pinctrl_dev *pctrldev,
 		       unsigned func,
 		       unsigned group)
 {
 	struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
 	const struct ltq_pin_group *pin_grp = &info->grps[group];
 	int i, pin, pin_func, ret;

 	if (!pin_grp->npins ||
 		(match_group_mux(pin_grp, info, pin_grp->mux) < 0)) {
 		dev_err(info->dev, "Failed to set the pin group: %s\n",
 			info->grps[group].name);
 		return -EINVAL;
 	}
 	for (i = 0; i < pin_grp->npins; i++) {
 		pin = match_mfp(info, pin_grp->pins[i]);
 		if (pin < 0) {
 			dev_err(info->dev, "could not find mfp for pin %d\n",
 				pin_grp->pins[i]);
 			return -EINVAL;
 		}
 		pin_func = match_mux(&info->mfp[pin], pin_grp->mux);
 		ret = info->apply_mux(pctrldev, pin, pin_func);
 		if (ret) {
 			dev_err(info->dev,
 				"failed to apply mux %d for pin %d\n",
 				pin_func, pin);
 			return ret;
 		}
 	}
 	return 0;
 }

 static int ltq_pmx_gpio_request_enable(struct pinctrl_dev *pctrldev,
 				struct pinctrl_gpio_range *range,
 				unsigned pin)
 {
 	struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
 	int mfp = match_mfp(info, pin);
 	int pin_func;

 	if (mfp < 0) {
 		dev_err(info->dev, "could not find mfp for pin %d\n", pin);
 		return -EINVAL;
 	}

 	pin_func = match_mux(&info->mfp[mfp], 0);
 	if (pin_func < 0) {
 		dev_err(info->dev, "No GPIO function on pin%d\n", mfp);
 		return -EINVAL;
 	}

 	return info->apply_mux(pctrldev, mfp, pin_func);
 }

 static const struct pinmux_ops ltq_pmx_ops = {
 	.get_functions_count	= ltq_pmx_func_count,
 	.get_function_name	= ltq_pmx_func_name,
 	.get_function_groups	= ltq_pmx_get_groups,
 	.set_mux		= ltq_pmx_set,
 	.gpio_request_enable	= ltq_pmx_gpio_request_enable,
 };

 /*
  * allow different socs to register with the generic part of the lanti
  * pinctrl code
  */
 int ltq_pinctrl_register(struct platform_device *pdev,
 				struct ltq_pinmux_info *info)
 {
 	struct pinctrl_desc *desc;

 	if (!info)
 		return -EINVAL;
 	desc = info->desc;
 	desc->pctlops = &ltq_pctrl_ops;
 	desc->pmxops = &ltq_pmx_ops;
 	info->dev = &pdev->dev;

 	info->pctrl = devm_pinctrl_register(&pdev->dev, desc, info);
 	if (IS_ERR(info->pctrl)) {
 		dev_err(&pdev->dev, "failed to register LTQ pinmux driver\n");
 		return PTR_ERR(info->pctrl);
 	}
 	platform_set_drvdata(pdev, info);
 	return 0;
 }
	/*
	* linux/drivers/pinctrl/pinctrl-lantiq.c
	* based on linux/drivers/pinctrl/pinctrl-pxa3xx.c
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* publishhed by the Free Software Foundation.
	*
	* Copyright (C) 2012 John Crispin <john@phrozen.org>
	*/

	#include <linux/module.h>
	#include <linux/device.h>
	#include <linux/io.h>
	#include <linux/platform_device.h>
	#include <linux/slab.h>
	#include <linux/of.h>

	#include "pinctrl-lantiq.h"

	static int ltq_get_group_count(struct pinctrl_dev *pctrldev)
	{
	struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
	return info->num_grps;
	}

	static const char ltq_get_group_name(struct pinctrl_dev pctrldev,
	unsigned selector)
	{
	struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
	if (selector >= info->num_grps)
	return NULL;
	return info->grps[selector].name;
	}

	static int ltq_get_group_pins(struct pinctrl_dev *pctrldev,
	unsigned selector,
	const unsigned **pins,
	unsigned *num_pins)
	{
	struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
	if (selector >= info->num_grps)
	return -EINVAL;
	*pins = info->grps[selector].pins;
	*num_pins = info->grps[selector].npins;
	return 0;
	}

	static void ltq_pinctrl_dt_free_map(struct pinctrl_dev *pctldev,
	struct pinctrl_map *map, unsigned num_maps)
	{
	int i;

	for (i = 0; i < num_maps; i++)
	if (map[i].type == PIN_MAP_TYPE_CONFIGS_PIN \|\|
	map[i].type == PIN_MAP_TYPE_CONFIGS_GROUP)
	kfree(map[i].data.configs.configs);
	kfree(map);
	}

	static void ltq_pinctrl_pin_dbg_show(struct pinctrl_dev *pctldev,
	struct seq_file *s,
	unsigned offset)
	{
	seq_printf(s, " %s", dev_name(pctldev->dev));
	}

	static void ltq_pinctrl_dt_subnode_to_map(struct pinctrl_dev *pctldev,
	struct device_node *np,
	struct pinctrl_map **map)
	{
	struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctldev);
	struct property *pins = of_find_property(np, "lantiq,pins", NULL);
	struct property *groups = of_find_property(np, "lantiq,groups", NULL);
	unsigned long configs[3];
	unsigned num_configs = 0;
	struct property *prop;
	const char group, pin;
	const char *function;
	int ret, i;

	if (!pins && !groups) {
	dev_err(pctldev->dev, "%pOFn defines neither pins nor groups\n",
	np);
	return;
	}

	if (pins && groups) {
	dev_err(pctldev->dev, "%pOFn defines both pins and groups\n",
	np);
	return;
	}

	ret = of_property_read_string(np, "lantiq,function", &function);
	if (groups && !ret) {
	of_property_for_each_string(np, "lantiq,groups", prop, group) {
	(*map)->type = PIN_MAP_TYPE_MUX_GROUP;
	(*map)->name = function;
	(*map)->data.mux.group = group;
	(*map)->data.mux.function = function;
	(*map)++;
	}
	}

	for (i = 0; i < info->num_params; i++) {
	u32 val;
	int ret = of_property_read_u32(np,
	info->params[i].property, &val);
	if (!ret)
	configs[num_configs++] =
	LTQ_PINCONF_PACK(info->params[i].param,
	val);
	}

	if (!num_configs)
	return;

	of_property_for_each_string(np, "lantiq,pins", prop, pin) {
	(*map)->data.configs.configs = kmemdup(configs,
	num_configs * sizeof(unsigned long),
	GFP_KERNEL);
	(*map)->type = PIN_MAP_TYPE_CONFIGS_PIN;
	(*map)->name = pin;
	(*map)->data.configs.group_or_pin = pin;
	(*map)->data.configs.num_configs = num_configs;
	(*map)++;
	}
	of_property_for_each_string(np, "lantiq,groups", prop, group) {
	(*map)->data.configs.configs = kmemdup(configs,
	num_configs * sizeof(unsigned long),
	GFP_KERNEL);
	(*map)->type = PIN_MAP_TYPE_CONFIGS_GROUP;
	(*map)->name = group;
	(*map)->data.configs.group_or_pin = group;
	(*map)->data.configs.num_configs = num_configs;
	(*map)++;
	}
	}

	static int ltq_pinctrl_dt_subnode_size(struct device_node *np)
	{
	int ret;

	ret = of_property_count_strings(np, "lantiq,groups");
	if (ret < 0)
	ret = of_property_count_strings(np, "lantiq,pins");
	return ret;
	}

	static int ltq_pinctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
	struct device_node *np_config,
	struct pinctrl_map **map,
	unsigned *num_maps)
	{
	struct pinctrl_map *tmp;
	struct device_node *np;
	int max_maps = 0;

	for_each_child_of_node(np_config, np)
	max_maps += ltq_pinctrl_dt_subnode_size(np);
	*map = kzalloc(array3_size(max_maps, sizeof(struct pinctrl_map), 2),
	GFP_KERNEL);
	if (!*map)
	return -ENOMEM;
	tmp = *map;

	for_each_child_of_node(np_config, np)
	ltq_pinctrl_dt_subnode_to_map(pctldev, np, &tmp);
	num_maps = ((int)(tmp - map));

	return 0;
	}

	static const struct pinctrl_ops ltq_pctrl_ops = {
	.get_groups_count = ltq_get_group_count,
	.get_group_name = ltq_get_group_name,
	.get_group_pins = ltq_get_group_pins,
	.pin_dbg_show = ltq_pinctrl_pin_dbg_show,
	.dt_node_to_map = ltq_pinctrl_dt_node_to_map,
	.dt_free_map = ltq_pinctrl_dt_free_map,
	};

	static int ltq_pmx_func_count(struct pinctrl_dev *pctrldev)
	{
	struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);

	return info->num_funcs;
	}

	static const char ltq_pmx_func_name(struct pinctrl_dev pctrldev,
	unsigned selector)
	{
	struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);

	if (selector >= info->num_funcs)
	return NULL;

	return info->funcs[selector].name;
	}

	static int ltq_pmx_get_groups(struct pinctrl_dev *pctrldev,
	unsigned func,
	const char * const **groups,
	unsigned * const num_groups)
	{
	struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);

	*groups = info->funcs[func].groups;
	*num_groups = info->funcs[func].num_groups;

	return 0;
	}

	/* Return function number. If failure, return negative value. */
	static int match_mux(const struct ltq_mfp_pin *mfp, unsigned mux)
	{
	int i;
	for (i = 0; i < LTQ_MAX_MUX; i++) {
	if (mfp->func[i] == mux)
	break;
	}
	if (i >= LTQ_MAX_MUX)
	return -EINVAL;
	return i;
	}

	/* dont assume .mfp is linearly mapped. find the mfp with the correct .pin */
	static int match_mfp(const struct ltq_pinmux_info *info, int pin)
	{
	int i;
	for (i = 0; i < info->num_mfp; i++) {
	if (info->mfp[i].pin == pin)
	return i;
	}
	return -1;
	}

	/* check whether current pin configuration is valid. Negative for failure */
	static int match_group_mux(const struct ltq_pin_group *grp,
	const struct ltq_pinmux_info *info,
	unsigned mux)
	{
	int i, pin, ret = 0;
	for (i = 0; i < grp->npins; i++) {
	pin = match_mfp(info, grp->pins[i]);
	if (pin < 0) {
	dev_err(info->dev, "could not find mfp for pin %d\n",
	grp->pins[i]);
	return -EINVAL;
	}
	ret = match_mux(&info->mfp[pin], mux);
	if (ret < 0) {
	dev_err(info->dev, "Can't find mux %d on pin%d\n",
	mux, pin);
	break;
	}
	}
	return ret;
	}

	static int ltq_pmx_set(struct pinctrl_dev *pctrldev,
	unsigned func,
	unsigned group)
	{
	struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
	const struct ltq_pin_group *pin_grp = &info->grps[group];
	int i, pin, pin_func, ret;

	if (!pin_grp->npins \|\|
	(match_group_mux(pin_grp, info, pin_grp->mux) < 0)) {
	dev_err(info->dev, "Failed to set the pin group: %s\n",
	info->grps[group].name);
	return -EINVAL;
	}
	for (i = 0; i < pin_grp->npins; i++) {
	pin = match_mfp(info, pin_grp->pins[i]);
	if (pin < 0) {
	dev_err(info->dev, "could not find mfp for pin %d\n",
	pin_grp->pins[i]);
	return -EINVAL;
	}
	pin_func = match_mux(&info->mfp[pin], pin_grp->mux);
	ret = info->apply_mux(pctrldev, pin, pin_func);
	if (ret) {
	dev_err(info->dev,
	"failed to apply mux %d for pin %d\n",
	pin_func, pin);
	return ret;
	}
	}
	return 0;
	}

	static int ltq_pmx_gpio_request_enable(struct pinctrl_dev *pctrldev,
	struct pinctrl_gpio_range *range,
	unsigned pin)
	{
	struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
	int mfp = match_mfp(info, pin);
	int pin_func;

	if (mfp < 0) {
	dev_err(info->dev, "could not find mfp for pin %d\n", pin);
	return -EINVAL;
	}

	pin_func = match_mux(&info->mfp[mfp], 0);
	if (pin_func < 0) {
	dev_err(info->dev, "No GPIO function on pin%d\n", mfp);
	return -EINVAL;
	}

	return info->apply_mux(pctrldev, mfp, pin_func);
	}

	static const struct pinmux_ops ltq_pmx_ops = {
	.get_functions_count = ltq_pmx_func_count,
	.get_function_name = ltq_pmx_func_name,
	.get_function_groups = ltq_pmx_get_groups,
	.set_mux = ltq_pmx_set,
	.gpio_request_enable = ltq_pmx_gpio_request_enable,
	};

	/*
	* allow different socs to register with the generic part of the lanti
	* pinctrl code
	*/
	int ltq_pinctrl_register(struct platform_device *pdev,
	struct ltq_pinmux_info *info)
	{
	struct pinctrl_desc *desc;

	if (!info)
	return -EINVAL;
	desc = info->desc;
	desc->pctlops = &ltq_pctrl_ops;
	desc->pmxops = &ltq_pmx_ops;
	info->dev = &pdev->dev;

	info->pctrl = devm_pinctrl_register(&pdev->dev, desc, info);
	if (IS_ERR(info->pctrl)) {
	dev_err(&pdev->dev, "failed to register LTQ pinmux driver\n");
	return PTR_ERR(info->pctrl);
	}
	platform_set_drvdata(pdev, info);
	return 0;
	}