--- /dev/null
+/*
+ * 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;
+}
Code Review / kvmfornfv.git / blobdiff