diff options
Diffstat (limited to 'drivers/sh/pfc/pinctrl.c')
| -rw-r--r-- | drivers/sh/pfc/pinctrl.c | 530 |
1 files changed, 530 insertions, 0 deletions
diff --git a/drivers/sh/pfc/pinctrl.c b/drivers/sh/pfc/pinctrl.c new file mode 100644 index 00000000000..0802b6c0d65 --- /dev/null +++ b/drivers/sh/pfc/pinctrl.c @@ -0,0 +1,530 @@ +/* + * 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 "pinctrl-sh_pfc" + +#define pr_fmt(fmt) DRV_NAME " " KBUILD_MODNAME ": " fmt + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/sh_pfc.h> +#include <linux/err.h> +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/platform_device.h> +#include <linux/pinctrl/consumer.h> +#include <linux/pinctrl/pinctrl.h> +#include <linux/pinctrl/pinconf.h> +#include <linux/pinctrl/pinmux.h> +#include <linux/pinctrl/pinconf-generic.h> + +struct sh_pfc_pinctrl { + struct pinctrl_dev *pctl; + struct sh_pfc *pfc; + + struct pinmux_gpio **functions; + unsigned int nr_functions; + + struct pinctrl_pin_desc *pads; + unsigned int nr_pads; + + spinlock_t lock; +}; + +static struct sh_pfc_pinctrl *sh_pfc_pmx; + +static int sh_pfc_get_groups_count(struct pinctrl_dev *pctldev) +{ + struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev); + + return pmx->nr_pads; +} + +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->pads[selector].name; +} + +static int sh_pfc_get_group_pins(struct pinctrl_dev *pctldev, unsigned group, + const unsigned **pins, unsigned *num_pins) +{ + struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev); + + *pins = &pmx->pads[group].number; + *num_pins = 1; + + 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); +} + +static 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, +}; + +static int sh_pfc_get_functions_count(struct pinctrl_dev *pctldev) +{ + struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev); + + return pmx->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->functions[selector]->name; +} + +static int sh_pfc_get_function_groups(struct pinctrl_dev *pctldev, unsigned func, + const char * const **groups, + unsigned * const num_groups) +{ + struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev); + + *groups = &pmx->functions[func]->name; + *num_groups = 1; + + return 0; +} + +static int sh_pfc_noop_enable(struct pinctrl_dev *pctldev, unsigned func, + unsigned group) +{ + return 0; +} + +static void sh_pfc_noop_disable(struct pinctrl_dev *pctldev, unsigned func, + unsigned group) +{ +} + +static inline int sh_pfc_config_function(struct sh_pfc *pfc, unsigned offset) +{ + if (sh_pfc_config_gpio(pfc, offset, + PINMUX_TYPE_FUNCTION, + GPIO_CFG_DRYRUN) != 0) + return -EINVAL; + + if (sh_pfc_config_gpio(pfc, offset, + PINMUX_TYPE_FUNCTION, + GPIO_CFG_REQ) != 0) + return -EINVAL; + + return 0; +} + +static int sh_pfc_reconfig_pin(struct sh_pfc *pfc, unsigned offset, + int new_type) +{ + unsigned long flags; + int pinmux_type; + int ret = -EINVAL; + + spin_lock_irqsave(&pfc->lock, flags); + + pinmux_type = pfc->gpios[offset].flags & PINMUX_FLAG_TYPE; + + /* + * See if the present config needs to first be de-configured. + */ + switch (pinmux_type) { + case PINMUX_TYPE_GPIO: + break; + case PINMUX_TYPE_OUTPUT: + case PINMUX_TYPE_INPUT: + case PINMUX_TYPE_INPUT_PULLUP: + case PINMUX_TYPE_INPUT_PULLDOWN: + sh_pfc_config_gpio(pfc, offset, pinmux_type, GPIO_CFG_FREE); + break; + default: + goto err; + } + + /* + * Dry run + */ + if (sh_pfc_config_gpio(pfc, offset, new_type, + GPIO_CFG_DRYRUN) != 0) + goto err; + + /* + * Request + */ + if (sh_pfc_config_gpio(pfc, offset, new_type, + GPIO_CFG_REQ) != 0) + goto err; + + pfc->gpios[offset].flags &= ~PINMUX_FLAG_TYPE; + pfc->gpios[offset].flags |= new_type; + + ret = 0; + +err: + 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; + unsigned long flags; + int ret, pinmux_type; + + spin_lock_irqsave(&pfc->lock, flags); + + pinmux_type = pfc->gpios[offset].flags & PINMUX_FLAG_TYPE; + + switch (pinmux_type) { + case PINMUX_TYPE_FUNCTION: + pr_notice_once("Use of GPIO API for function requests is " + "deprecated, convert to pinctrl\n"); + /* handle for now */ + ret = sh_pfc_config_function(pfc, offset); + if (unlikely(ret < 0)) + goto err; + + break; + case PINMUX_TYPE_GPIO: + break; + default: + pr_err("Unsupported mux type (%d), bailing...\n", pinmux_type); + return -ENOTSUPP; + } + + ret = 0; + +err: + 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; + unsigned long flags; + int pinmux_type; + + spin_lock_irqsave(&pfc->lock, flags); + + pinmux_type = pfc->gpios[offset].flags & PINMUX_FLAG_TYPE; + + sh_pfc_config_gpio(pfc, offset, pinmux_type, GPIO_CFG_FREE); + + 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); + int type = input ? PINMUX_TYPE_INPUT : PINMUX_TYPE_OUTPUT; + + return sh_pfc_reconfig_pin(pmx->pfc, offset, type); +} + +static 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, + .enable = sh_pfc_noop_enable, + .disable = sh_pfc_noop_disable, + .gpio_request_enable = sh_pfc_gpio_request_enable, + .gpio_disable_free = sh_pfc_gpio_disable_free, + .gpio_set_direction = sh_pfc_gpio_set_direction, +}; + +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; + + *config = pfc->gpios[pin].flags & PINMUX_FLAG_TYPE; + + return 0; +} + +static int sh_pfc_pinconf_set(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; + + /* Validate the new type */ + if (config >= PINMUX_FLAG_TYPE) + return -EINVAL; + + return sh_pfc_reconfig_pin(pmx->pfc, pin, config); +} + +static void sh_pfc_pinconf_dbg_show(struct pinctrl_dev *pctldev, + struct seq_file *s, unsigned pin) +{ + const char *pinmux_type_str[] = { + [PINMUX_TYPE_NONE] = "none", + [PINMUX_TYPE_FUNCTION] = "function", + [PINMUX_TYPE_GPIO] = "gpio", + [PINMUX_TYPE_OUTPUT] = "output", + [PINMUX_TYPE_INPUT] = "input", + [PINMUX_TYPE_INPUT_PULLUP] = "input bias pull up", + [PINMUX_TYPE_INPUT_PULLDOWN] = "input bias pull down", + }; + unsigned long config; + int rc; + + rc = sh_pfc_pinconf_get(pctldev, pin, &config); + if (unlikely(rc != 0)) + return; + + seq_printf(s, " %s", pinmux_type_str[config]); +} + +static struct pinconf_ops sh_pfc_pinconf_ops = { + .pin_config_get = sh_pfc_pinconf_get, + .pin_config_set = sh_pfc_pinconf_set, + .pin_config_dbg_show = sh_pfc_pinconf_dbg_show, +}; + +static struct pinctrl_gpio_range sh_pfc_gpio_range = { + .name = DRV_NAME, + .id = 0, +}; + +static struct pinctrl_desc sh_pfc_pinctrl_desc = { + .name = DRV_NAME, + .owner = THIS_MODULE, + .pctlops = &sh_pfc_pinctrl_ops, + .pmxops = &sh_pfc_pinmux_ops, + .confops = &sh_pfc_pinconf_ops, +}; + +int sh_pfc_register_pinctrl(struct sh_pfc *pfc) +{ + sh_pfc_pmx = kzalloc(sizeof(struct sh_pfc_pinctrl), GFP_KERNEL); + if (unlikely(!sh_pfc_pmx)) + return -ENOMEM; + + spin_lock_init(&sh_pfc_pmx->lock); + + sh_pfc_pmx->pfc = pfc; + + return 0; +} +EXPORT_SYMBOL_GPL(sh_pfc_register_pinctrl); + +static inline void __devinit sh_pfc_map_one_gpio(struct sh_pfc *pfc, + struct sh_pfc_pinctrl *pmx, + struct pinmux_gpio *gpio, + unsigned offset) +{ + struct pinmux_data_reg *dummy; + unsigned long flags; + int bit; + + gpio->flags &= ~PINMUX_FLAG_TYPE; + + if (sh_pfc_get_data_reg(pfc, offset, &dummy, &bit) == 0) + gpio->flags |= PINMUX_TYPE_GPIO; + else { + gpio->flags |= PINMUX_TYPE_FUNCTION; + + spin_lock_irqsave(&pmx->lock, flags); + pmx->nr_functions++; + spin_unlock_irqrestore(&pmx->lock, flags); + } +} + +/* pinmux ranges -> pinctrl pin descs */ +static int __devinit sh_pfc_map_gpios(struct sh_pfc *pfc, + struct sh_pfc_pinctrl *pmx) +{ + unsigned long flags; + int i; + + pmx->nr_pads = pfc->last_gpio - pfc->first_gpio + 1; + + pmx->pads = kmalloc(sizeof(struct pinctrl_pin_desc) * pmx->nr_pads, + GFP_KERNEL); + if (unlikely(!pmx->pads)) { + pmx->nr_pads = 0; + return -ENOMEM; + } + + spin_lock_irqsave(&pfc->lock, flags); + + /* + * We don't necessarily have a 1:1 mapping between pin and linux + * GPIO number, as the latter maps to the associated enum_id. + * Care needs to be taken to translate back to pin space when + * dealing with any pin configurations. + */ + for (i = 0; i < pmx->nr_pads; i++) { + struct pinctrl_pin_desc *pin = pmx->pads + i; + struct pinmux_gpio *gpio = pfc->gpios + i; + + pin->number = pfc->first_gpio + i; + pin->name = gpio->name; + + /* XXX */ + if (unlikely(!gpio->enum_id)) + continue; + + sh_pfc_map_one_gpio(pfc, pmx, gpio, i); + } + + spin_unlock_irqrestore(&pfc->lock, flags); + + sh_pfc_pinctrl_desc.pins = pmx->pads; + sh_pfc_pinctrl_desc.npins = pmx->nr_pads; + + return 0; +} + +static int __devinit sh_pfc_map_functions(struct sh_pfc *pfc, + struct sh_pfc_pinctrl *pmx) +{ + unsigned long flags; + int i, fn; + + pmx->functions = kzalloc(pmx->nr_functions * sizeof(void *), + GFP_KERNEL); + if (unlikely(!pmx->functions)) + return -ENOMEM; + + spin_lock_irqsave(&pmx->lock, flags); + + for (i = fn = 0; i < pmx->nr_pads; i++) { + struct pinmux_gpio *gpio = pfc->gpios + i; + + if ((gpio->flags & PINMUX_FLAG_TYPE) == PINMUX_TYPE_FUNCTION) + pmx->functions[fn++] = gpio; + } + + spin_unlock_irqrestore(&pmx->lock, flags); + + return 0; +} + +static int __devinit sh_pfc_pinctrl_probe(struct platform_device *pdev) +{ + struct sh_pfc *pfc; + int ret; + + if (unlikely(!sh_pfc_pmx)) + return -ENODEV; + + pfc = sh_pfc_pmx->pfc; + + ret = sh_pfc_map_gpios(pfc, sh_pfc_pmx); + if (unlikely(ret != 0)) + return ret; + + ret = sh_pfc_map_functions(pfc, sh_pfc_pmx); + if (unlikely(ret != 0)) + goto free_pads; + + sh_pfc_pmx->pctl = pinctrl_register(&sh_pfc_pinctrl_desc, &pdev->dev, + sh_pfc_pmx); + if (IS_ERR(sh_pfc_pmx->pctl)) { + ret = PTR_ERR(sh_pfc_pmx->pctl); + goto free_functions; + } + + sh_pfc_gpio_range.npins = pfc->last_gpio - pfc->first_gpio + 1; + sh_pfc_gpio_range.base = pfc->first_gpio; + sh_pfc_gpio_range.pin_base = pfc->first_gpio; + + pinctrl_add_gpio_range(sh_pfc_pmx->pctl, &sh_pfc_gpio_range); + + platform_set_drvdata(pdev, sh_pfc_pmx); + + return 0; + +free_functions: + kfree(sh_pfc_pmx->functions); +free_pads: + kfree(sh_pfc_pmx->pads); + kfree(sh_pfc_pmx); + + return ret; +} + +static int __devexit sh_pfc_pinctrl_remove(struct platform_device *pdev) +{ + struct sh_pfc_pinctrl *pmx = platform_get_drvdata(pdev); + + pinctrl_remove_gpio_range(pmx->pctl, &sh_pfc_gpio_range); + pinctrl_unregister(pmx->pctl); + + platform_set_drvdata(pdev, NULL); + + kfree(sh_pfc_pmx->functions); + kfree(sh_pfc_pmx->pads); + kfree(sh_pfc_pmx); + + return 0; +} + +static struct platform_driver sh_pfc_pinctrl_driver = { + .probe = sh_pfc_pinctrl_probe, + .remove = __devexit_p(sh_pfc_pinctrl_remove), + .driver = { + .name = DRV_NAME, + .owner = THIS_MODULE, + }, +}; + +static struct platform_device sh_pfc_pinctrl_device = { + .name = DRV_NAME, + .id = -1, +}; + +static int __init sh_pfc_pinctrl_init(void) +{ + int rc; + + rc = platform_driver_register(&sh_pfc_pinctrl_driver); + if (likely(!rc)) { + rc = platform_device_register(&sh_pfc_pinctrl_device); + if (unlikely(rc)) + platform_driver_unregister(&sh_pfc_pinctrl_driver); + } + + return rc; +} + +static void __exit sh_pfc_pinctrl_exit(void) +{ + platform_driver_unregister(&sh_pfc_pinctrl_driver); +} + +subsys_initcall(sh_pfc_pinctrl_init); +module_exit(sh_pfc_pinctrl_exit); |