diff options
Diffstat (limited to 'drivers/pinctrl')
| -rw-r--r-- | drivers/pinctrl/core.c | 105 | ||||
| -rw-r--r-- | drivers/pinctrl/core.h | 25 | ||||
| -rw-r--r-- | drivers/pinctrl/pinmux.c | 402 | ||||
| -rw-r--r-- | drivers/pinctrl/pinmux.h | 41 |
4 files changed, 197 insertions, 376 deletions
diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c index aefc3394db9..535f8d53c28 100644 --- a/drivers/pinctrl/core.c +++ b/drivers/pinctrl/core.c @@ -460,14 +460,15 @@ EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_output); static struct pinctrl *pinctrl_get_locked(struct device *dev, const char *name) { - struct pinctrl_dev *pctldev = NULL; + struct pinctrl_dev *pctldev; const char *devname; struct pinctrl *p; unsigned num_maps = 0; - int ret = -ENODEV; + int ret; struct pinctrl_maps *maps_node; int i; struct pinctrl_map const *map; + struct pinctrl_setting *setting; /* We must have both a dev and state name */ if (WARN_ON(!dev || !name)) @@ -487,39 +488,50 @@ static struct pinctrl *pinctrl_get_locked(struct device *dev, const char *name) dev_err(dev, "failed to alloc struct pinctrl\n"); return ERR_PTR(-ENOMEM); } - pinmux_init_pinctrl_handle(p); + p->dev = dev; + p->state = name; + INIT_LIST_HEAD(&p->settings); /* Iterate over the pin control maps to locate the right ones */ for_each_maps(maps_node, i, map) { + /* Map must be for this device */ + if (strcmp(map->dev_name, devname)) + continue; + + /* State name must be the one we're looking for */ + if (strcmp(map->name, name)) + continue; + /* - * First, try to find the pctldev given in the map + * Try to find the pctldev given in the map */ pctldev = get_pinctrl_dev_from_devname(map->ctrl_dev_name); if (!pctldev) { dev_err(dev, "unknown pinctrl device %s in map entry", map->ctrl_dev_name); - pinmux_put(p); - kfree(p); /* Eventually, this should trigger deferred probe */ - return ERR_PTR(-ENODEV); + ret = -ENODEV; + goto error; } dev_dbg(dev, "in map, found pctldev %s to handle function %s", dev_name(pctldev->dev), map->function); - /* Map must be for this device */ - if (strcmp(map->dev_name, devname)) - continue; + setting = kzalloc(sizeof(*setting), GFP_KERNEL); + if (setting == NULL) { + dev_err(dev, + "failed to alloc struct pinctrl_setting\n"); + ret = -ENOMEM; + goto error; + } - /* State name must be the one we're looking for */ - if (strcmp(map->name, name)) - continue; + setting->pctldev = pctldev; + ret = pinmux_map_to_setting(map, setting); + if (ret < 0) + goto error; + + list_add_tail(&setting->node, &p->settings); - ret = pinmux_apply_muxmap(pctldev, p, dev, devname, map); - if (ret) { - kfree(p); - return ERR_PTR(ret); - } num_maps++; } @@ -541,6 +553,14 @@ static struct pinctrl *pinctrl_get_locked(struct device *dev, const char *name) list_add_tail(&p->node, &pinctrl_list); return p; + +error: + list_for_each_entry(setting, &p->settings, node) + pinmux_free_setting(setting); + + kfree(p); + + return ERR_PTR(ret); } /** @@ -564,13 +584,18 @@ EXPORT_SYMBOL_GPL(pinctrl_get); static void pinctrl_put_locked(struct pinctrl *p) { + struct pinctrl_setting *setting, *n; + if (p == NULL) return; if (p->usecount) pr_warn("releasing pin control handle with active users!\n"); - /* Free the groups and all acquired pins */ - pinmux_put(p); + list_for_each_entry_safe(setting, n, &p->settings, node) { + pinmux_free_setting(setting); + list_del(&setting->node); + kfree(setting); + } /* Remove from list */ list_del(&p->node); @@ -592,18 +617,24 @@ EXPORT_SYMBOL_GPL(pinctrl_put); static int pinctrl_enable_locked(struct pinctrl *p) { - int ret = 0; + struct pinctrl_setting *setting; + int ret; if (p == NULL) return -EINVAL; if (p->usecount++ == 0) { - ret = pinmux_enable(p); - if (ret) - p->usecount--; + list_for_each_entry(setting, &p->settings, node) { + ret = pinmux_enable_setting(setting); + if (ret < 0) { + /* FIXME: Difficult to return to prev state */ + p->usecount--; + return ret; + } + } } - return ret; + return 0; } /** @@ -622,11 +653,14 @@ EXPORT_SYMBOL_GPL(pinctrl_enable); static void pinctrl_disable_locked(struct pinctrl *p) { + struct pinctrl_setting *setting; + if (p == NULL) return; if (--p->usecount == 0) { - pinmux_disable(p); + list_for_each_entry(setting, &p->settings, node) + pinmux_disable_setting(setting); } } @@ -857,27 +891,20 @@ static int pinctrl_maps_show(struct seq_file *s, void *what) static int pinctrl_show(struct seq_file *s, void *what) { struct pinctrl *p; + struct pinctrl_setting *setting; seq_puts(s, "Requested pin control handlers their pinmux maps:\n"); mutex_lock(&pinctrl_mutex); list_for_each_entry(p, &pinctrl_list, node) { - struct pinctrl_dev *pctldev = p->pctldev; + seq_printf(s, "device: %s state: %s users: %u\n", + dev_name(p->dev), p->state, p->usecount); - if (!pctldev) { - seq_puts(s, "NO PIN CONTROLLER DEVICE\n"); - continue; + list_for_each_entry(setting, &p->settings, node) { + seq_printf(s, " "); + pinmux_dbg_show(s, setting); } - - seq_printf(s, "device: %s", - pinctrl_dev_get_name(p->pctldev)); - - pinmux_dbg_show(s, p); - - seq_printf(s, " users: %u map-> %s\n", - p->usecount, - p->dev ? dev_name(p->dev) : "(system)"); } mutex_unlock(&pinctrl_mutex); diff --git a/drivers/pinctrl/core.h b/drivers/pinctrl/core.h index 8808f25a07d..5f258b79340 100644 --- a/drivers/pinctrl/core.h +++ b/drivers/pinctrl/core.h @@ -49,22 +49,31 @@ struct pinctrl_dev { * struct pinctrl - per-device pin control state holder * @node: global list node * @dev: the device using this pin control handle + * @state: the state name passed to pinctrl_get() * @usecount: the number of active users of this pin controller setting, used * to keep track of nested use cases - * @pctldev: pin control device handling this pin control handle - * @groups: the group selectors for the pinmux device and - * selector combination handling this pinmux, this is a list that - * will be traversed on all pinmux operations such as - * get/put/enable/disable + * @settings: a list of settings for this device/state */ struct pinctrl { struct list_head node; struct device *dev; + const char *state; unsigned usecount; + struct list_head settings; +}; + +/** + * struct pinctrl_setting - an individual mux setting + * @node: list node for struct pinctrl's @settings field + * @pctldev: pin control device handling to be programmed + * @group_selector: the group selector to program + * @func_selector: the function selector to program + */ +struct pinctrl_setting { + struct list_head node; struct pinctrl_dev *pctldev; -#ifdef CONFIG_PINMUX - struct list_head groups; -#endif + unsigned group_selector; + unsigned func_selector; }; /** diff --git a/drivers/pinctrl/pinmux.c b/drivers/pinctrl/pinmux.c index 7342c26f424..f0fb98d252e 100644 --- a/drivers/pinctrl/pinmux.c +++ b/drivers/pinctrl/pinmux.c @@ -7,6 +7,8 @@ * * Author: Linus Walleij <linus.walleij@linaro.org> * + * Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved. + * * License terms: GNU General Public License (GPL) version 2 */ #define pr_fmt(fmt) "pinmux core: " fmt @@ -28,19 +30,6 @@ #include "core.h" #include "pinmux.h" -/** - * struct pinmux_group - group list item for pinmux groups - * @node: pinmux group list node - * @func_selector: the function selector for the pinmux device handling - * this pinmux - * @group_selector: the group selector for this group - */ -struct pinmux_group { - struct list_head node; - unsigned func_selector; - unsigned group_selector; -}; - int pinmux_check_ops(struct pinctrl_dev *pctldev) { const struct pinmux_ops *ops = pctldev->desc->pmxops; @@ -244,164 +233,8 @@ int pinmux_gpio_direction(struct pinctrl_dev *pctldev, return ret; } -/** - * acquire_pins() - acquire all the pins for a certain function on a pinmux - * @pctldev: the device to take the pins on - * @owner: a representation of the owner of this pin; typically the device - * name that controls its mux function - * @group_selector: the group selector containing the pins to acquire - */ -static int acquire_pins(struct pinctrl_dev *pctldev, - const char *owner, - unsigned group_selector) -{ - const struct pinctrl_ops *pctlops = pctldev->desc->pctlops; - const unsigned *pins; - unsigned num_pins; - int ret; - int i; - - ret = pctlops->get_group_pins(pctldev, group_selector, - &pins, &num_pins); - if (ret) - return ret; - - dev_dbg(pctldev->dev, "requesting the %u pins from group %u\n", - num_pins, group_selector); - - /* Try to allocate all pins in this group, one by one */ - for (i = 0; i < num_pins; i++) { - ret = pin_request(pctldev, pins[i], owner, NULL); - if (ret) { - dev_err(pctldev->dev, - "could not get request pin %d on device %s - conflicting mux mappings?\n", - pins[i], - pinctrl_dev_get_name(pctldev)); - /* On error release all taken pins */ - i--; /* this pin just failed */ - for (; i >= 0; i--) - pin_free(pctldev, pins[i], NULL); - return -ENODEV; - } - } - return 0; -} - -/** - * release_pins() - release pins taken by earlier acquirement - * @pctldev: the device to free the pins on - * @group_selector: the group selector containing the pins to free - */ -static void release_pins(struct pinctrl_dev *pctldev, - unsigned group_selector) -{ - const struct pinctrl_ops *pctlops = pctldev->desc->pctlops; - const unsigned *pins; - unsigned num_pins; - int ret; - int i; - - ret = pctlops->get_group_pins(pctldev, group_selector, - &pins, &num_pins); - if (ret) { - dev_err(pctldev->dev, "could not get pins to release for group selector %d\n", - group_selector); - return; - } - for (i = 0; i < num_pins; i++) - pin_free(pctldev, pins[i], NULL); -} - -/** - * pinmux_check_pin_group() - check function and pin group combo - * @pctldev: device to check the pin group vs function for - * @func_selector: the function selector to check the pin group for, we have - * already looked this up in the calling function - * @pin_group: the pin group to match to the function - * - * This function will check that the pinmux driver can supply the - * selected pin group for a certain function, returns the group selector if - * the group and function selector will work fine together, else returns - * negative - */ -static int pinmux_check_pin_group(struct pinctrl_dev *pctldev, - unsigned func_selector, - const char *pin_group) -{ - const struct pinmux_ops *pmxops = pctldev->desc->pmxops; - const struct pinctrl_ops *pctlops = pctldev->desc->pctlops; - int ret; - - /* - * If the driver does not support different pin groups for the - * functions, we only support group 0, and assume this exists. - */ - if (!pctlops || !pctlops->list_groups) - return 0; - - /* - * Passing NULL (no specific group) will select the first and - * hopefully only group of pins available for this function. - */ - if (!pin_group) { - char const * const *groups; - unsigned num_groups; - - ret = pmxops->get_function_groups(pctldev, func_selector, - &groups, &num_groups); - if (ret) - return ret; - if (num_groups < 1) - return -EINVAL; - ret = pinctrl_get_group_selector(pctldev, groups[0]); - if (ret < 0) { - dev_err(pctldev->dev, - "function %s wants group %s but the pin controller does not seem to have that group\n", - pmxops->get_function_name(pctldev, func_selector), - groups[0]); - return ret; - } - - if (num_groups > 1) - dev_dbg(pctldev->dev, - "function %s support more than one group, default-selecting first group %s (%d)\n", - pmxops->get_function_name(pctldev, func_selector), - groups[0], - ret); - - return ret; - } - - dev_dbg(pctldev->dev, - "check if we have pin group %s on controller %s\n", - pin_group, pinctrl_dev_get_name(pctldev)); - - ret = pinctrl_get_group_selector(pctldev, pin_group); - if (ret < 0) { - dev_dbg(pctldev->dev, - "%s does not support pin group %s with function %s\n", - pinctrl_dev_get_name(pctldev), - pin_group, - pmxops->get_function_name(pctldev, func_selector)); - } - return ret; -} - -/** - * pinmux_search_function() - check pin control driver for a certain function - * @pctldev: device to check for function and position - * @map: function map containing the function and position to look for - * @func_selector: returns the applicable function selector if found - * @group_selector: returns the applicable group selector if found - * - * This will search the pinmux driver for an applicable - * function with a specific pin group, returns 0 if these can be mapped - * negative otherwise - */ -static int pinmux_search_function(struct pinctrl_dev *pctldev, - struct pinctrl_map const *map, - unsigned *func_selector, - unsigned *group_selector) +static int pinmux_func_name_to_selector(struct pinctrl_dev *pctldev, + const char *function) { const struct pinmux_ops *ops = pctldev->desc->pmxops; unsigned selector = 0; @@ -410,155 +243,128 @@ static int pinmux_search_function(struct pinctrl_dev *pctldev, while (ops->list_functions(pctldev, selector) >= 0) { const char *fname = ops->get_function_name(pctldev, selector); - int ret; - if (!strcmp(map->function, fname)) { - /* Found the function, check pin group */ - ret = pinmux_check_pin_group(pctldev, selector, - map->group); - if (ret < 0) - return ret; + if (!strcmp(function, fname)) + return selector; - /* This function and group selector can be used */ - *func_selector = selector; - *group_selector = ret; - return 0; - - } selector++; } pr_err("%s does not support function %s\n", - pinctrl_dev_get_name(pctldev), map->function); + pinctrl_dev_get_name(pctldev), function); return -EINVAL; } -/** - * pinmux_enable_muxmap() - enable a map entry for a certain pinmux - */ -static int pinmux_enable_muxmap(struct pinctrl_dev *pctldev, - struct pinctrl *p, - struct device *dev, - const char *devname, - struct pinctrl_map const *map) +int pinmux_map_to_setting(struct pinctrl_map const *map, + struct pinctrl_setting *setting) { - unsigned func_selector; - unsigned group_selector; - struct pinmux_group *grp; + struct pinctrl_dev *pctldev = setting->pctldev; + const struct pinmux_ops *pmxops = pctldev->desc->pmxops; + const struct pinctrl_ops *pctlops = pctldev->desc->pctlops; + char const * const *groups; + unsigned num_groups; int ret; + const char *group; + int i; + const unsigned *pins; + unsigned num_pins; - /* - * Note that we're not locking the pinmux mutex here, because - * this is only called at pinmux initialization time when it - * has not been added to any list and thus is not reachable - * by anyone else. - */ + setting->func_selector = + pinmux_func_name_to_selector(pctldev, map->function); + if (setting->func_selector < 0) + return setting->func_selector; - if (p->pctldev && p->pctldev != pctldev) { - dev_err(pctldev->dev, - "different pin control devices given for device %s, function %s\n", - devname, map->function); + ret = pmxops->get_function_groups(pctldev, setting->func_selector, + &groups, &num_groups); + if (ret < 0) + return ret; + if (!num_groups) return -EINVAL; + + if (map->group) { + bool found = false; + group = map->group; + for (i = 0; i < num_groups; i++) { + if (!strcmp(group, groups[i])) { + found = true; + break; + } + } + if (!found) + return -EINVAL; + } else { + group = groups[0]; } - p->dev = dev; - p->pctldev = pctldev; - /* Now go into the driver and try to match a function and group */ - ret = pinmux_search_function(pctldev, map, &func_selector, - &group_selector); - if (ret < 0) - return ret; + setting->group_selector = + pinctrl_get_group_selector(pctldev, group); + if (setting->group_selector < 0) + return setting->group_selector; - /* Now add this group selector, we may have many of them */ - grp = kmalloc(sizeof(*grp), GFP_KERNEL); - if (!grp) - return -ENOMEM; - grp->func_selector = func_selector; - grp->group_selector = group_selector; - ret = acquire_pins(pctldev, devname, group_selector); + ret = pctlops->get_group_pins(pctldev, setting->group_selector, + &pins, &num_pins); if (ret) { - kfree(grp); - return ret; + dev_err(pctldev->dev, + "could not get pins for device %s group selector %d\n", + pinctrl_dev_get_name(pctldev), setting->group_selector); + return -ENODEV; + } + + /* Try to allocate all pins in this group, one by one */ + for (i = 0; i < num_pins; i++) { + ret = pin_request(pctldev, pins[i], map->dev_name, NULL); + if (ret) { + dev_err(pctldev->dev, + "could not get request pin %d on device %s\n", + pins[i], pinctrl_dev_get_name(pctldev)); + /* On error release all taken pins */ + i--; /* this pin just failed */ + for (; i >= 0; i--) + pin_free(pctldev, pins[i], NULL); + return -ENODEV; + } } - list_add_tail(&grp->node, &p->groups); return 0; } -/** - * pinmux_apply_muxmap() - apply a certain mux mapping entry - */ -int pinmux_apply_muxmap(struct pinctrl_dev *pctldev, - struct pinctrl *p, - struct device *dev, - const char *devname, - struct pinctrl_map const *map) +void pinmux_free_setting(struct pinctrl_setting const *setting) { + struct pinctrl_dev *pctldev = setting->pctldev; + const struct pinctrl_ops *pctlops = pctldev->desc->pctlops; + const unsigned *pins; + unsigned num_pins; int ret; + int i; - ret = pinmux_enable_muxmap(pctldev, p, dev, - devname, map); + ret = pctlops->get_group_pins(pctldev, setting->group_selector, + &pins, &num_pins); if (ret) { - pinmux_put(p); - return ret; + dev_err(pctldev->dev, + "could not get pins for device %s group selector %d\n", + pinctrl_dev_get_name(pctldev), setting->group_selector); + return; } - return 0; -} - -/** - * pinmux_put() - free up the pinmux portions of a pin controller handle - */ -void pinmux_put(struct pinctrl *p) -{ - struct list_head *node, *tmp; - - list_for_each_safe(node, tmp, &p->groups) { - struct pinmux_group *grp = - list_entry(node, struct pinmux_group, node); - /* Release all pins taken by this group */ - release_pins(p->pctldev, grp->group_selector); - list_del(node); - kfree(grp); - } + for (i = 0; i < num_pins; i++) + pin_free(pctldev, pins[i], NULL); } -/** - * pinmux_enable() - enable the pinmux portion of a pin control handle - */ -int pinmux_enable(struct pinctrl *p) +int pinmux_enable_setting(struct pinctrl_setting const *setting) { - struct pinctrl_dev *pctldev = p->pctldev; + struct pinctrl_dev *pctldev = setting->pctldev; const struct pinmux_ops *ops = pctldev->desc->pmxops; - struct pinmux_group *grp; - int ret; - list_for_each_entry(grp, &p->groups, node) { - ret = ops->enable(pctldev, grp->func_selector, - grp->group_selector); - if (ret) - /* - * TODO: call disable() on all groups we called - * enable() on to this point? - */ - return ret; - } - return 0; + return ops->enable(pctldev, setting->func_selector, + setting->group_selector); } -/** - * pinmux_disable() - disable the pinmux portions of a pin control handle - */ -void pinmux_disable(struct pinctrl *p) +void pinmux_disable_setting(struct pinctrl_setting const *setting) { - struct pinctrl_dev *pctldev = p->pctldev; + struct pinctrl_dev *pctldev = setting->pctldev; const struct pinmux_ops *ops = pctldev->desc->pmxops; - struct pinmux_group *grp; - list_for_each_entry(grp, &p->groups, node) { - ops->disable(pctldev, grp->func_selector, - grp->group_selector); - } + ops->disable(pctldev, setting->func_selector, setting->group_selector); } #ifdef CONFIG_DEBUG_FS @@ -635,30 +441,18 @@ static int pinmux_pins_show(struct seq_file *s, void *what) return 0; } -void pinmux_dbg_show(struct seq_file *s, struct pinctrl *p) +void pinmux_dbg_show(struct seq_file *s, struct pinctrl_setting const *setting) { - struct pinctrl_dev *pctldev = p->pctldev; - const struct pinmux_ops *pmxops; - const struct pinctrl_ops *pctlops; - struct pinmux_group *grp; - const char *sep = ""; - - pmxops = pctldev->desc->pmxops; - pctlops = pctldev->desc->pctlops; - - seq_printf(s, " groups: ["); - list_for_each_entry(grp, &p->groups, node) { - seq_printf(s, "%s%s (%u)=%s (%u)", - sep, - pctlops->get_group_name(pctldev, - grp->group_selector), - grp->group_selector, - pmxops->get_function_name(pctldev, - grp->func_selector), - grp->func_selector); - sep = ", "; - } - seq_printf(s, " ]"); + struct pinctrl_dev *pctldev = setting->pctldev; + const struct pinmux_ops *pmxops = pctldev->desc->pmxops; + const struct pinctrl_ops *pctlops = pctldev->desc->pctlops; + + seq_printf(s, "controller: %s group: %s (%u) function: %s (%u)\n", + pinctrl_dev_get_name(pctldev), + pctlops->get_group_name(pctldev, setting->group_selector), + setting->group_selector, + pmxops->get_function_name(pctldev, setting->func_selector), + setting->func_selector); } static int pinmux_functions_open(struct inode *inode, struct file *file) diff --git a/drivers/pinctrl/pinmux.h b/drivers/pinctrl/pinmux.h index 822febb2d96..1500ae88f87 100644 --- a/drivers/pinctrl/pinmux.h +++ b/drivers/pinctrl/pinmux.h @@ -13,6 +13,7 @@ #ifdef CONFIG_PINMUX int pinmux_check_ops(struct pinctrl_dev *pctldev); + int pinmux_request_gpio(struct pinctrl_dev *pctldev, struct pinctrl_gpio_range *range, unsigned pin, unsigned gpio); @@ -21,21 +22,16 @@ void pinmux_free_gpio(struct pinctrl_dev *pctldev, unsigned pin, int pinmux_gpio_direction(struct pinctrl_dev *pctldev, struct pinctrl_gpio_range *range, unsigned pin, bool input); -static inline void pinmux_init_pinctrl_handle(struct pinctrl *p) -{ - INIT_LIST_HEAD(&p->groups); -} -int pinmux_apply_muxmap(struct pinctrl_dev *pctldev, - struct pinctrl *p, - struct device *dev, - const char *devname, - struct pinctrl_map const *map); -void pinmux_put(struct pinctrl *p); -int pinmux_enable(struct pinctrl *p); -void pinmux_disable(struct pinctrl *p); + +int pinmux_map_to_setting(struct pinctrl_map const *map, + struct pinctrl_setting *setting); +void pinmux_free_setting(struct pinctrl_setting const *setting); +int pinmux_enable_setting(struct pinctrl_setting const *setting); +void pinmux_disable_setting(struct pinctrl_setting const *setting); + +void pinmux_dbg_show(struct seq_file *s, struct pinctrl_setting const *setting); void pinmux_init_device_debugfs(struct dentry *devroot, struct pinctrl_dev *pctldev); -void pinmux_dbg_show(struct seq_file *s, struct pinctrl *p); #else @@ -64,28 +60,23 @@ static inline int pinmux_gpio_direction(struct pinctrl_dev *pctldev, return 0; } -static inline void pinmux_init_pinctrl_handle(struct pinctrl *p) -{ -} - -static inline int pinmux_apply_muxmap(struct pinctrl_dev *pctldev, - struct pinctrl *p, - struct device *dev, - const char *devname, - struct pinctrl_map const *map) +static inline int pinmux_map_to_setting(struct pinctrl_map const *map, + struct pinctrl_setting *setting) { return 0; } -static inline void pinmux_put(struct pinctrl *p) +static inline void pinmux_free_setting(struct pinctrl_setting const *setting) { } -static inline int pinmux_enable(struct pinctrl *p) +static inline int pinmux_enable_setting(struct pinctrl_setting const *setting) { + return 0; } -static inline void pinmux_disable(struct pinctrl *p) +static inline void pinmux_disable_setting( + struct pinctrl_setting const *setting) { } |