Initial import

1 files changed, 642 insertions, 0 deletions

diff --git a/drivers/pinctrl/sh-pfc/pinctrl.c b/drivers/pinctrl/sh-pfc/pinctrl.c
new file mode 100644
index 000000000..072e7c62c
--- /dev/null
+++ b/drivers/pinctrl/sh-pfc/pinctrl.c
@@ -0,0 +1,642 @@
+/*
+ * 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 "sh-pfc"
+
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/pinctrl/machine.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinconf-generic.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+
+#include "core.h"
+#include "../core.h"
+#include "../pinconf.h"
+
+struct sh_pfc_pin_config {
+	u32 type;
+};
+
+struct sh_pfc_pinctrl {
+	struct pinctrl_dev *pctl;
+	struct pinctrl_desc pctl_desc;
+
+	struct sh_pfc *pfc;
+
+	struct pinctrl_pin_desc *pins;
+	struct sh_pfc_pin_config *configs;
+};
+
+static int sh_pfc_get_groups_count(struct pinctrl_dev *pctldev)
+{
+	struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
+
+	return pmx->pfc->info->nr_groups;
+}
+
+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->pfc->info->groups[selector].name;
+}
+
+static int sh_pfc_get_group_pins(struct pinctrl_dev *pctldev, unsigned selector,
+				 const unsigned **pins, unsigned *num_pins)
+{
+	struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
+
+	*pins = pmx->pfc->info->groups[selector].pins;
+	*num_pins = pmx->pfc->info->groups[selector].nr_pins;
+
+	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);
+}
+
+#ifdef CONFIG_OF
+static int sh_pfc_map_add_config(struct pinctrl_map *map,
+				 const char *group_or_pin,
+				 enum pinctrl_map_type type,
+				 unsigned long *configs,
+				 unsigned int num_configs)
+{
+	unsigned long *cfgs;
+
+	cfgs = kmemdup(configs, num_configs * sizeof(*cfgs),
+		       GFP_KERNEL);
+	if (cfgs == NULL)
+		return -ENOMEM;
+
+	map->type = type;
+	map->data.configs.group_or_pin = group_or_pin;
+	map->data.configs.configs = cfgs;
+	map->data.configs.num_configs = num_configs;
+
+	return 0;
+}
+
+static int sh_pfc_dt_subnode_to_map(struct device *dev, struct device_node *np,
+				    struct pinctrl_map **map,
+				    unsigned int *num_maps, unsigned int *index)
+{
+	struct pinctrl_map *maps = *map;
+	unsigned int nmaps = *num_maps;
+	unsigned int idx = *index;
+	unsigned int num_configs;
+	const char *function = NULL;
+	unsigned long *configs;
+	struct property *prop;
+	unsigned int num_groups;
+	unsigned int num_pins;
+	const char *group;
+	const char *pin;
+	int ret;
+
+	/* Parse the function and configuration properties. At least a function
+	 * or one configuration must be specified.
+	 */
+	ret = of_property_read_string(np, "renesas,function", &function);
+	if (ret < 0 && ret != -EINVAL) {
+		dev_err(dev, "Invalid function in DT\n");
+		return ret;
+	}
+
+	ret = pinconf_generic_parse_dt_config(np, NULL, &configs, &num_configs);
+	if (ret < 0)
+		return ret;
+
+	if (!function && num_configs == 0) {
+		dev_err(dev,
+			"DT node must contain at least a function or config\n");
+		goto done;
+	}
+
+	/* Count the number of pins and groups and reallocate mappings. */
+	ret = of_property_count_strings(np, "renesas,pins");
+	if (ret == -EINVAL) {
+		num_pins = 0;
+	} else if (ret < 0) {
+		dev_err(dev, "Invalid pins list in DT\n");
+		goto done;
+	} else {
+		num_pins = ret;
+	}
+
+	ret = of_property_count_strings(np, "renesas,groups");
+	if (ret == -EINVAL) {
+		num_groups = 0;
+	} else if (ret < 0) {
+		dev_err(dev, "Invalid pin groups list in DT\n");
+		goto done;
+	} else {
+		num_groups = ret;
+	}
+
+	if (!num_pins && !num_groups) {
+		dev_err(dev, "No pin or group provided in DT node\n");
+		ret = -ENODEV;
+		goto done;
+	}
+
+	if (function)
+		nmaps += num_groups;
+	if (configs)
+		nmaps += num_pins + num_groups;
+
+	maps = krealloc(maps, sizeof(*maps) * nmaps, GFP_KERNEL);
+	if (maps == NULL) {
+		ret = -ENOMEM;
+		goto done;
+	}
+
+	*map = maps;
+	*num_maps = nmaps;
+
+	/* Iterate over pins and groups and create the mappings. */
+	of_property_for_each_string(np, "renesas,groups", prop, group) {
+		if (function) {
+			maps[idx].type = PIN_MAP_TYPE_MUX_GROUP;
+			maps[idx].data.mux.group = group;
+			maps[idx].data.mux.function = function;
+			idx++;
+		}
+
+		if (configs) {
+			ret = sh_pfc_map_add_config(&maps[idx], group,
+						    PIN_MAP_TYPE_CONFIGS_GROUP,
+						    configs, num_configs);
+			if (ret < 0)
+				goto done;
+
+			idx++;
+		}
+	}
+
+	if (!configs) {
+		ret = 0;
+		goto done;
+	}
+
+	of_property_for_each_string(np, "renesas,pins", prop, pin) {
+		ret = sh_pfc_map_add_config(&maps[idx], pin,
+					    PIN_MAP_TYPE_CONFIGS_PIN,
+					    configs, num_configs);
+		if (ret < 0)
+			goto done;
+
+		idx++;
+	}
+
+done:
+	*index = idx;
+	kfree(configs);
+	return ret;
+}
+
+static void sh_pfc_dt_free_map(struct pinctrl_dev *pctldev,
+			       struct pinctrl_map *map, unsigned num_maps)
+{
+	unsigned int i;
+
+	if (map == NULL)
+		return;
+
+	for (i = 0; i < num_maps; ++i) {
+		if (map[i].type == PIN_MAP_TYPE_CONFIGS_GROUP ||
+		    map[i].type == PIN_MAP_TYPE_CONFIGS_PIN)
+			kfree(map[i].data.configs.configs);
+	}
+
+	kfree(map);
+}
+
+static int sh_pfc_dt_node_to_map(struct pinctrl_dev *pctldev,
+				 struct device_node *np,
+				 struct pinctrl_map **map, unsigned *num_maps)
+{
+	struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
+	struct device *dev = pmx->pfc->dev;
+	struct device_node *child;
+	unsigned int index;
+	int ret;
+
+	*map = NULL;
+	*num_maps = 0;
+	index = 0;
+
+	for_each_child_of_node(np, child) {
+		ret = sh_pfc_dt_subnode_to_map(dev, child, map, num_maps,
+					       &index);
+		if (ret < 0)
+			goto done;
+	}
+
+	/* If no mapping has been found in child nodes try the config node. */
+	if (*num_maps == 0) {
+		ret = sh_pfc_dt_subnode_to_map(dev, np, map, num_maps, &index);
+		if (ret < 0)
+			goto done;
+	}
+
+	if (*num_maps)
+		return 0;
+
+	dev_err(dev, "no mapping found in node %s\n", np->full_name);
+	ret = -EINVAL;
+
+done:
+	if (ret < 0)
+		sh_pfc_dt_free_map(pctldev, *map, *num_maps);
+
+	return ret;
+}
+#endif /* CONFIG_OF */
+
+static const 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,
+#ifdef CONFIG_OF
+	.dt_node_to_map		= sh_pfc_dt_node_to_map,
+	.dt_free_map		= sh_pfc_dt_free_map,
+#endif
+};
+
+static int sh_pfc_get_functions_count(struct pinctrl_dev *pctldev)
+{
+	struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
+
+	return pmx->pfc->info->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->pfc->info->functions[selector].name;
+}
+
+static int sh_pfc_get_function_groups(struct pinctrl_dev *pctldev,
+				      unsigned selector,
+				      const char * const **groups,
+				      unsigned * const num_groups)
+{
+	struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
+
+	*groups = pmx->pfc->info->functions[selector].groups;
+	*num_groups = pmx->pfc->info->functions[selector].nr_groups;
+
+	return 0;
+}
+
+static int sh_pfc_func_set_mux(struct pinctrl_dev *pctldev, unsigned selector,
+			       unsigned group)
+{
+	struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
+	struct sh_pfc *pfc = pmx->pfc;
+	const struct sh_pfc_pin_group *grp = &pfc->info->groups[group];
+	unsigned long flags;
+	unsigned int i;
+	int ret = 0;
+
+	spin_lock_irqsave(&pfc->lock, flags);
+
+	for (i = 0; i < grp->nr_pins; ++i) {
+		int idx = sh_pfc_get_pin_index(pfc, grp->pins[i]);
+		struct sh_pfc_pin_config *cfg = &pmx->configs[idx];
+
+		if (cfg->type != PINMUX_TYPE_NONE) {
+			ret = -EBUSY;
+			goto done;
+		}
+	}
+
+	for (i = 0; i < grp->nr_pins; ++i) {
+		ret = sh_pfc_config_mux(pfc, grp->mux[i], PINMUX_TYPE_FUNCTION);
+		if (ret < 0)
+			break;
+	}
+
+done:
+	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;
+	int idx = sh_pfc_get_pin_index(pfc, offset);
+	struct sh_pfc_pin_config *cfg = &pmx->configs[idx];
+	unsigned long flags;
+	int ret;
+
+	spin_lock_irqsave(&pfc->lock, flags);
+
+	if (cfg->type != PINMUX_TYPE_NONE) {
+		dev_err(pfc->dev,
+			"Pin %u is busy, can't configure it as GPIO.\n",
+			offset);
+		ret = -EBUSY;
+		goto done;
+	}
+
+	if (!pfc->gpio) {
+		/* If GPIOs are handled externally the pin mux type need to be
+		 * set to GPIO here.
+		 */
+		const struct sh_pfc_pin *pin = &pfc->info->pins[idx];
+
+		ret = sh_pfc_config_mux(pfc, pin->enum_id, PINMUX_TYPE_GPIO);
+		if (ret < 0)
+			goto done;
+	}
+
+	cfg->type = PINMUX_TYPE_GPIO;
+
+	ret = 0;
+
+done:
+	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;
+	int idx = sh_pfc_get_pin_index(pfc, offset);
+	struct sh_pfc_pin_config *cfg = &pmx->configs[idx];
+	unsigned long flags;
+
+	spin_lock_irqsave(&pfc->lock, flags);
+	cfg->type = PINMUX_TYPE_NONE;
+	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);
+	struct sh_pfc *pfc = pmx->pfc;
+	int new_type = input ? PINMUX_TYPE_INPUT : PINMUX_TYPE_OUTPUT;
+	int idx = sh_pfc_get_pin_index(pfc, offset);
+	const struct sh_pfc_pin *pin = &pfc->info->pins[idx];
+	struct sh_pfc_pin_config *cfg = &pmx->configs[idx];
+	unsigned long flags;
+	unsigned int dir;
+	int ret;
+
+	/* Check if the requested direction is supported by the pin. Not all SoC
+	 * provide pin config data, so perform the check conditionally.
+	 */
+	if (pin->configs) {
+		dir = input ? SH_PFC_PIN_CFG_INPUT : SH_PFC_PIN_CFG_OUTPUT;
+		if (!(pin->configs & dir))
+			return -EINVAL;
+	}
+
+	spin_lock_irqsave(&pfc->lock, flags);
+
+	ret = sh_pfc_config_mux(pfc, pin->enum_id, new_type);
+	if (ret < 0)
+		goto done;
+
+	cfg->type = new_type;
+
+done:
+	spin_unlock_irqrestore(&pfc->lock, flags);
+	return ret;
+}
+
+static const 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,
+	.set_mux		= sh_pfc_func_set_mux,
+	.gpio_request_enable	= sh_pfc_gpio_request_enable,
+	.gpio_disable_free	= sh_pfc_gpio_disable_free,
+	.gpio_set_direction	= sh_pfc_gpio_set_direction,
+};
+
+/* Check whether the requested parameter is supported for a pin. */
+static bool sh_pfc_pinconf_validate(struct sh_pfc *pfc, unsigned int _pin,
+				    enum pin_config_param param)
+{
+	int idx = sh_pfc_get_pin_index(pfc, _pin);
+	const struct sh_pfc_pin *pin = &pfc->info->pins[idx];
+
+	switch (param) {
+	case PIN_CONFIG_BIAS_DISABLE:
+		return true;
+
+	case PIN_CONFIG_BIAS_PULL_UP:
+		return pin->configs & SH_PFC_PIN_CFG_PULL_UP;
+
+	case PIN_CONFIG_BIAS_PULL_DOWN:
+		return pin->configs & SH_PFC_PIN_CFG_PULL_DOWN;
+
+	default:
+		return false;
+	}
+}
+
+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;
+	enum pin_config_param param = pinconf_to_config_param(*config);
+	unsigned long flags;
+	unsigned int bias;
+
+	if (!sh_pfc_pinconf_validate(pfc, _pin, param))
+		return -ENOTSUPP;
+
+	switch (param) {
+	case PIN_CONFIG_BIAS_DISABLE:
+	case PIN_CONFIG_BIAS_PULL_UP:
+	case PIN_CONFIG_BIAS_PULL_DOWN:
+		if (!pfc->info->ops || !pfc->info->ops->get_bias)
+			return -ENOTSUPP;
+
+		spin_lock_irqsave(&pfc->lock, flags);
+		bias = pfc->info->ops->get_bias(pfc, _pin);
+		spin_unlock_irqrestore(&pfc->lock, flags);
+
+		if (bias != param)
+			return -EINVAL;
+
+		*config = 0;
+		break;
+
+	default:
+		return -ENOTSUPP;
+	}
+
+	return 0;
+}
+
+static int sh_pfc_pinconf_set(struct pinctrl_dev *pctldev, unsigned _pin,
+			      unsigned long *configs, unsigned num_configs)
+{
+	struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
+	struct sh_pfc *pfc = pmx->pfc;
+	enum pin_config_param param;
+	unsigned long flags;
+	unsigned int i;
+
+	for (i = 0; i < num_configs; i++) {
+		param = pinconf_to_config_param(configs[i]);
+
+		if (!sh_pfc_pinconf_validate(pfc, _pin, param))
+			return -ENOTSUPP;
+
+		switch (param) {
+		case PIN_CONFIG_BIAS_PULL_UP:
+		case PIN_CONFIG_BIAS_PULL_DOWN:
+		case PIN_CONFIG_BIAS_DISABLE:
+			if (!pfc->info->ops || !pfc->info->ops->set_bias)
+				return -ENOTSUPP;
+
+			spin_lock_irqsave(&pfc->lock, flags);
+			pfc->info->ops->set_bias(pfc, _pin, param);
+			spin_unlock_irqrestore(&pfc->lock, flags);
+
+			break;
+
+		default:
+			return -ENOTSUPP;
+		}
+	} /* for each config */
+
+	return 0;
+}
+
+static int sh_pfc_pinconf_group_set(struct pinctrl_dev *pctldev, unsigned group,
+				    unsigned long *configs,
+				    unsigned num_configs)
+{
+	struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
+	const unsigned int *pins;
+	unsigned int num_pins;
+	unsigned int i;
+
+	pins = pmx->pfc->info->groups[group].pins;
+	num_pins = pmx->pfc->info->groups[group].nr_pins;
+
+	for (i = 0; i < num_pins; ++i)
+		sh_pfc_pinconf_set(pctldev, pins[i], configs, num_configs);
+
+	return 0;
+}
+
+static const struct pinconf_ops sh_pfc_pinconf_ops = {
+	.is_generic			= true,
+	.pin_config_get			= sh_pfc_pinconf_get,
+	.pin_config_set			= sh_pfc_pinconf_set,
+	.pin_config_group_set		= sh_pfc_pinconf_group_set,
+	.pin_config_config_dbg_show	= pinconf_generic_dump_config,
+};
+
+/* PFC ranges -> pinctrl pin descs */
+static int sh_pfc_map_pins(struct sh_pfc *pfc, struct sh_pfc_pinctrl *pmx)
+{
+	unsigned int i;
+
+	/* Allocate and initialize the pins and configs arrays. */
+	pmx->pins = devm_kzalloc(pfc->dev,
+				 sizeof(*pmx->pins) * pfc->info->nr_pins,
+				 GFP_KERNEL);
+	if (unlikely(!pmx->pins))
+		return -ENOMEM;
+
+	pmx->configs = devm_kzalloc(pfc->dev,
+				    sizeof(*pmx->configs) * pfc->info->nr_pins,
+				    GFP_KERNEL);
+	if (unlikely(!pmx->configs))
+		return -ENOMEM;
+
+	for (i = 0; i < pfc->info->nr_pins; ++i) {
+		const struct sh_pfc_pin *info = &pfc->info->pins[i];
+		struct sh_pfc_pin_config *cfg = &pmx->configs[i];
+		struct pinctrl_pin_desc *pin = &pmx->pins[i];
+
+		/* If the pin number is equal to -1 all pins are considered */
+		pin->number = info->pin != (u16)-1 ? info->pin : i;
+		pin->name = info->name;
+		cfg->type = PINMUX_TYPE_NONE;
+	}
+
+	return 0;
+}
+
+int sh_pfc_register_pinctrl(struct sh_pfc *pfc)
+{
+	struct sh_pfc_pinctrl *pmx;
+	int ret;
+
+	pmx = devm_kzalloc(pfc->dev, sizeof(*pmx), GFP_KERNEL);
+	if (unlikely(!pmx))
+		return -ENOMEM;
+
+	pmx->pfc = pfc;
+	pfc->pinctrl = pmx;
+
+	ret = sh_pfc_map_pins(pfc, pmx);
+	if (ret < 0)
+		return ret;
+
+	pmx->pctl_desc.name = DRV_NAME;
+	pmx->pctl_desc.owner = THIS_MODULE;
+	pmx->pctl_desc.pctlops = &sh_pfc_pinctrl_ops;
+	pmx->pctl_desc.pmxops = &sh_pfc_pinmux_ops;
+	pmx->pctl_desc.confops = &sh_pfc_pinconf_ops;
+	pmx->pctl_desc.pins = pmx->pins;
+	pmx->pctl_desc.npins = pfc->info->nr_pins;
+
+	pmx->pctl = pinctrl_register(&pmx->pctl_desc, pfc->dev, pmx);
+	if (pmx->pctl == NULL)
+		return -EINVAL;
+
+	return 0;
+}
+
+int sh_pfc_unregister_pinctrl(struct sh_pfc *pfc)
+{
+	struct sh_pfc_pinctrl *pmx = pfc->pinctrl;
+
+	pinctrl_unregister(pmx->pctl);
+
+	pfc->pinctrl = NULL;
+	return 0;
+}