Initial import

1 files changed, 392 insertions, 0 deletions

diff --git a/drivers/pinctrl/pinconf-generic.c b/drivers/pinctrl/pinconf-generic.c
new file mode 100644
index 000000000..e63ad9fbd
--- /dev/null
+++ b/drivers/pinctrl/pinconf-generic.c
@@ -0,0 +1,392 @@
+/*
+ * Core driver for the generic pin config portions of the pin control subsystem
+ *
+ * Copyright (C) 2011 ST-Ericsson SA
+ * Written on behalf of Linaro for ST-Ericsson
+ *
+ * Author: Linus Walleij <linus.walleij@linaro.org>
+ *
+ * License terms: GNU General Public License (GPL) version 2
+ */
+
+#define pr_fmt(fmt) "generic pinconfig core: " fmt
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/slab.h>
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinconf-generic.h>
+#include <linux/of.h>
+#include "core.h"
+#include "pinconf.h"
+#include "pinctrl-utils.h"
+
+#ifdef CONFIG_DEBUG_FS
+static const struct pin_config_item conf_items[] = {
+	PCONFDUMP(PIN_CONFIG_BIAS_DISABLE, "input bias disabled", NULL, false),
+	PCONFDUMP(PIN_CONFIG_BIAS_HIGH_IMPEDANCE, "input bias high impedance", NULL, false),
+	PCONFDUMP(PIN_CONFIG_BIAS_BUS_HOLD, "input bias bus hold", NULL, false),
+	PCONFDUMP(PIN_CONFIG_BIAS_PULL_UP, "input bias pull up", NULL, false),
+	PCONFDUMP(PIN_CONFIG_BIAS_PULL_DOWN, "input bias pull down", NULL, false),
+	PCONFDUMP(PIN_CONFIG_BIAS_PULL_PIN_DEFAULT,
+				"input bias pull to pin specific state", NULL, false),
+	PCONFDUMP(PIN_CONFIG_DRIVE_PUSH_PULL, "output drive push pull", NULL, false),
+	PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_DRAIN, "output drive open drain", NULL, false),
+	PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_SOURCE, "output drive open source", NULL, false),
+	PCONFDUMP(PIN_CONFIG_DRIVE_STRENGTH, "output drive strength", "mA", true),
+	PCONFDUMP(PIN_CONFIG_INPUT_ENABLE, "input enabled", NULL, false),
+	PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT_ENABLE, "input schmitt enabled", NULL, false),
+	PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT, "input schmitt trigger", NULL, false),
+	PCONFDUMP(PIN_CONFIG_INPUT_DEBOUNCE, "input debounce", "usec", true),
+	PCONFDUMP(PIN_CONFIG_POWER_SOURCE, "pin power source", "selector", true),
+	PCONFDUMP(PIN_CONFIG_SLEW_RATE, "slew rate", NULL, true),
+	PCONFDUMP(PIN_CONFIG_LOW_POWER_MODE, "pin low power", "mode", true),
+	PCONFDUMP(PIN_CONFIG_OUTPUT, "pin output", "level", true),
+};
+
+static void pinconf_generic_dump_one(struct pinctrl_dev *pctldev,
+				     struct seq_file *s, const char *gname,
+				     unsigned pin,
+				     const struct pin_config_item *items,
+				     int nitems)
+{
+	int i;
+
+	for (i = 0; i < nitems; i++) {
+		unsigned long config;
+		int ret;
+
+		/* We want to check out this parameter */
+		config = pinconf_to_config_packed(items[i].param, 0);
+		if (gname)
+			ret = pin_config_group_get(dev_name(pctldev->dev),
+						   gname, &config);
+		else
+			ret = pin_config_get_for_pin(pctldev, pin, &config);
+		/* These are legal errors */
+		if (ret == -EINVAL || ret == -ENOTSUPP)
+			continue;
+		if (ret) {
+			seq_printf(s, "ERROR READING CONFIG SETTING %d ", i);
+			continue;
+		}
+		/* Space between multiple configs */
+		seq_puts(s, " ");
+		seq_puts(s, items[i].display);
+		/* Print unit if available */
+		if (items[i].has_arg) {
+			seq_printf(s, " (%u",
+				   pinconf_to_config_argument(config));
+			if (items[i].format)
+				seq_printf(s, " %s)", items[i].format);
+			else
+				seq_puts(s, ")");
+		}
+	}
+}
+
+/**
+ * pinconf_generic_dump_pins - Print information about pin or group of pins
+ * @pctldev:	Pincontrol device
+ * @s:		File to print to
+ * @gname:	Group name specifying pins
+ * @pin:	Pin number specyfying pin
+ *
+ * Print the pinconf configuration for the requested pin(s) to @s. Pins can be
+ * specified either by pin using @pin or by group using @gname. Only one needs
+ * to be specified the other can be NULL/0.
+ */
+void pinconf_generic_dump_pins(struct pinctrl_dev *pctldev, struct seq_file *s,
+			       const char *gname, unsigned pin)
+{
+	const struct pinconf_ops *ops = pctldev->desc->confops;
+
+	if (!ops->is_generic)
+		return;
+
+	/* generic parameters */
+	pinconf_generic_dump_one(pctldev, s, gname, pin, conf_items,
+				 ARRAY_SIZE(conf_items));
+	/* driver-specific parameters */
+	if (pctldev->desc->num_custom_params &&
+	    pctldev->desc->custom_conf_items)
+		pinconf_generic_dump_one(pctldev, s, gname, pin,
+					 pctldev->desc->custom_conf_items,
+					 pctldev->desc->num_custom_params);
+}
+
+void pinconf_generic_dump_config(struct pinctrl_dev *pctldev,
+				 struct seq_file *s, unsigned long config)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(conf_items); i++) {
+		if (pinconf_to_config_param(config) != conf_items[i].param)
+			continue;
+		seq_printf(s, "%s: 0x%x", conf_items[i].display,
+			   pinconf_to_config_argument(config));
+	}
+
+	if (!pctldev->desc->num_custom_params ||
+	    !pctldev->desc->custom_conf_items)
+		return;
+
+	for (i = 0; i < pctldev->desc->num_custom_params; i++) {
+		if (pinconf_to_config_param(config) !=
+		    pctldev->desc->custom_conf_items[i].param)
+			continue;
+		seq_printf(s, "%s: 0x%x",
+				pctldev->desc->custom_conf_items[i].display,
+				pinconf_to_config_argument(config));
+	}
+}
+EXPORT_SYMBOL_GPL(pinconf_generic_dump_config);
+#endif
+
+#ifdef CONFIG_OF
+static const struct pinconf_generic_params dt_params[] = {
+	{ "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 },
+	{ "bias-high-impedance", PIN_CONFIG_BIAS_HIGH_IMPEDANCE, 0 },
+	{ "bias-bus-hold", PIN_CONFIG_BIAS_BUS_HOLD, 0 },
+	{ "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 },
+	{ "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 },
+	{ "bias-pull-pin-default", PIN_CONFIG_BIAS_PULL_PIN_DEFAULT, 1 },
+	{ "drive-push-pull", PIN_CONFIG_DRIVE_PUSH_PULL, 0 },
+	{ "drive-open-drain", PIN_CONFIG_DRIVE_OPEN_DRAIN, 0 },
+	{ "drive-open-source", PIN_CONFIG_DRIVE_OPEN_SOURCE, 0 },
+	{ "drive-strength", PIN_CONFIG_DRIVE_STRENGTH, 0 },
+	{ "input-enable", PIN_CONFIG_INPUT_ENABLE, 1 },
+	{ "input-disable", PIN_CONFIG_INPUT_ENABLE, 0 },
+	{ "input-schmitt-enable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 1 },
+	{ "input-schmitt-disable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 0 },
+	{ "input-debounce", PIN_CONFIG_INPUT_DEBOUNCE, 0 },
+	{ "power-source", PIN_CONFIG_POWER_SOURCE, 0 },
+	{ "low-power-enable", PIN_CONFIG_LOW_POWER_MODE, 1 },
+	{ "low-power-disable", PIN_CONFIG_LOW_POWER_MODE, 0 },
+	{ "output-low", PIN_CONFIG_OUTPUT, 0, },
+	{ "output-high", PIN_CONFIG_OUTPUT, 1, },
+	{ "slew-rate", PIN_CONFIG_SLEW_RATE, 0},
+};
+
+/**
+ * parse_dt_cfg() - Parse DT pinconf parameters
+ * @np:	DT node
+ * @params:	Array of describing generic parameters
+ * @count:	Number of entries in @params
+ * @cfg:	Array of parsed config options
+ * @ncfg:	Number of entries in @cfg
+ *
+ * Parse the config options described in @params from @np and puts the result
+ * in @cfg. @cfg does not need to be empty, entries are added beggining at
+ * @ncfg. @ncfg is updated to reflect the number of entries after parsing. @cfg
+ * needs to have enough memory allocated to hold all possible entries.
+ */
+static void parse_dt_cfg(struct device_node *np,
+			 const struct pinconf_generic_params *params,
+			 unsigned int count, unsigned long *cfg,
+			 unsigned int *ncfg)
+{
+	int i;
+
+	for (i = 0; i < count; i++) {
+		u32 val;
+		int ret;
+		const struct pinconf_generic_params *par = &params[i];
+
+		ret = of_property_read_u32(np, par->property, &val);
+
+		/* property not found */
+		if (ret == -EINVAL)
+			continue;
+
+		/* use default value, when no value is specified */
+		if (ret)
+			val = par->default_value;
+
+		pr_debug("found %s with value %u\n", par->property, val);
+		cfg[*ncfg] = pinconf_to_config_packed(par->param, val);
+		(*ncfg)++;
+	}
+}
+
+/**
+ * pinconf_generic_parse_dt_config()
+ * parse the config properties into generic pinconfig values.
+ * @np: node containing the pinconfig properties
+ * @configs: array with nconfigs entries containing the generic pinconf values
+ * @nconfigs: umber of configurations
+ */
+int pinconf_generic_parse_dt_config(struct device_node *np,
+				    struct pinctrl_dev *pctldev,
+				    unsigned long **configs,
+				    unsigned int *nconfigs)
+{
+	unsigned long *cfg;
+	unsigned int max_cfg, ncfg = 0;
+	int ret;
+
+	if (!np)
+		return -EINVAL;
+
+	/* allocate a temporary array big enough to hold one of each option */
+	max_cfg = ARRAY_SIZE(dt_params);
+	if (pctldev)
+		max_cfg += pctldev->desc->num_custom_params;
+	cfg = kcalloc(max_cfg, sizeof(*cfg), GFP_KERNEL);
+	if (!cfg)
+		return -ENOMEM;
+
+	parse_dt_cfg(np, dt_params, ARRAY_SIZE(dt_params), cfg, &ncfg);
+	if (pctldev && pctldev->desc->num_custom_params &&
+		pctldev->desc->custom_params)
+		parse_dt_cfg(np, pctldev->desc->custom_params,
+			     pctldev->desc->num_custom_params, cfg, &ncfg);
+
+	ret = 0;
+
+	/* no configs found at all */
+	if (ncfg == 0) {
+		*configs = NULL;
+		*nconfigs = 0;
+		goto out;
+	}
+
+	/*
+	 * Now limit the number of configs to the real number of
+	 * found properties.
+	 */
+	*configs = kmemdup(cfg, ncfg * sizeof(unsigned long), GFP_KERNEL);
+	if (!*configs) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	*nconfigs = ncfg;
+
+out:
+	kfree(cfg);
+	return ret;
+}
+
+int pinconf_generic_dt_subnode_to_map(struct pinctrl_dev *pctldev,
+		struct device_node *np, struct pinctrl_map **map,
+		unsigned *reserved_maps, unsigned *num_maps,
+		enum pinctrl_map_type type)
+{
+	int ret;
+	const char *function;
+	struct device *dev = pctldev->dev;
+	unsigned long *configs = NULL;
+	unsigned num_configs = 0;
+	unsigned reserve, strings_count;
+	struct property *prop;
+	const char *group;
+	const char *subnode_target_type = "pins";
+
+	ret = of_property_count_strings(np, "pins");
+	if (ret < 0) {
+		ret = of_property_count_strings(np, "groups");
+		if (ret < 0)
+			/* skip this node; may contain config child nodes */
+			return 0;
+		if (type == PIN_MAP_TYPE_INVALID)
+			type = PIN_MAP_TYPE_CONFIGS_GROUP;
+		subnode_target_type = "groups";
+	} else {
+		if (type == PIN_MAP_TYPE_INVALID)
+			type = PIN_MAP_TYPE_CONFIGS_PIN;
+	}
+	strings_count = ret;
+
+	ret = of_property_read_string(np, "function", &function);
+	if (ret < 0) {
+		/* EINVAL=missing, which is fine since it's optional */
+		if (ret != -EINVAL)
+			dev_err(dev, "%s: could not parse property function\n",
+				of_node_full_name(np));
+		function = NULL;
+	}
+
+	ret = pinconf_generic_parse_dt_config(np, pctldev, &configs,
+					      &num_configs);
+	if (ret < 0) {
+		dev_err(dev, "%s: could not parse node property\n",
+			of_node_full_name(np));
+		return ret;
+	}
+
+	reserve = 0;
+	if (function != NULL)
+		reserve++;
+	if (num_configs)
+		reserve++;
+
+	reserve *= strings_count;
+
+	ret = pinctrl_utils_reserve_map(pctldev, map, reserved_maps,
+			num_maps, reserve);
+	if (ret < 0)
+		goto exit;
+
+	of_property_for_each_string(np, subnode_target_type, prop, group) {
+		if (function) {
+			ret = pinctrl_utils_add_map_mux(pctldev, map,
+					reserved_maps, num_maps, group,
+					function);
+			if (ret < 0)
+				goto exit;
+		}
+
+		if (num_configs) {
+			ret = pinctrl_utils_add_map_configs(pctldev, map,
+					reserved_maps, num_maps, group, configs,
+					num_configs, type);
+			if (ret < 0)
+				goto exit;
+		}
+	}
+	ret = 0;
+
+exit:
+	kfree(configs);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(pinconf_generic_dt_subnode_to_map);
+
+int pinconf_generic_dt_node_to_map(struct pinctrl_dev *pctldev,
+		struct device_node *np_config, struct pinctrl_map **map,
+		unsigned *num_maps, enum pinctrl_map_type type)
+{
+	unsigned reserved_maps;
+	struct device_node *np;
+	int ret;
+
+	reserved_maps = 0;
+	*map = NULL;
+	*num_maps = 0;
+
+	ret = pinconf_generic_dt_subnode_to_map(pctldev, np_config, map,
+						&reserved_maps, num_maps, type);
+	if (ret < 0)
+		goto exit;
+
+	for_each_child_of_node(np_config, np) {
+		ret = pinconf_generic_dt_subnode_to_map(pctldev, np, map,
+					&reserved_maps, num_maps, type);
+		if (ret < 0)
+			goto exit;
+	}
+	return 0;
+
+exit:
+	pinctrl_utils_dt_free_map(pctldev, *map, *num_maps);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(pinconf_generic_dt_node_to_map);
+
+#endif