+++ /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"
-#define pr_fmt(fmt) KBUILD_MODNAME " pinctrl: " fmt
-
-#include <linux/device.h>
-#include <linux/err.h>
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/pinctrl/consumer.h>
-#include <linux/pinctrl/pinconf.h>
-#include <linux/pinctrl/pinconf-generic.h>
-#include <linux/pinctrl/pinctrl.h>
-#include <linux/pinctrl/pinmux.h>
-#include <linux/sh_pfc.h>
-#include <linux/slab.h>
-#include <linux/spinlock.h>
-
-#include "core.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 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 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->pdata->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->pdata->gpios[offset].flags &= ~PINMUX_FLAG_TYPE;
- pfc->pdata->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->pdata->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:
- case PINMUX_TYPE_INPUT:
- case PINMUX_TYPE_OUTPUT:
- break;
- default:
- pr_err("Unsupported mux type (%d), bailing...\n", pinmux_type);
- ret = -ENOTSUPP;
- goto err;
- }
-
- 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->pdata->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->pdata->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);
-
- /* 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,
-};
-
-static void 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 sh_pfc_map_gpios(struct sh_pfc *pfc, struct sh_pfc_pinctrl *pmx)
-{
- unsigned long flags;
- int i;
-
- pmx->nr_pads = pfc->pdata->last_gpio - pfc->pdata->first_gpio + 1;
-
- pmx->pads = devm_kzalloc(pfc->dev, sizeof(*pmx->pads) * 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->pdata->gpios + i;
-
- pin->number = pfc->pdata->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 sh_pfc_map_functions(struct sh_pfc *pfc, struct sh_pfc_pinctrl *pmx)
-{
- unsigned long flags;
- int i, fn;
-
- pmx->functions = devm_kzalloc(pfc->dev, pmx->nr_functions *
- sizeof(*pmx->functions), 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->pdata->gpios + i;
-
- if ((gpio->flags & PINMUX_FLAG_TYPE) == PINMUX_TYPE_FUNCTION)
- pmx->functions[fn++] = gpio;
- }
-
- spin_unlock_irqrestore(&pmx->lock, flags);
-
- 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;
-
- spin_lock_init(&pmx->lock);
-
- pmx->pfc = pfc;
- pfc->pinctrl = pmx;
-
- ret = sh_pfc_map_gpios(pfc, pmx);
- if (unlikely(ret != 0))
- return ret;
-
- ret = sh_pfc_map_functions(pfc, pmx);
- if (unlikely(ret != 0))
- return ret;
-
- pmx->pctl = pinctrl_register(&sh_pfc_pinctrl_desc, pfc->dev, pmx);
- if (IS_ERR(pmx->pctl))
- return PTR_ERR(pmx->pctl);
-
- sh_pfc_gpio_range.npins = pfc->pdata->last_gpio
- - pfc->pdata->first_gpio + 1;
- sh_pfc_gpio_range.base = pfc->pdata->first_gpio;
- sh_pfc_gpio_range.pin_base = pfc->pdata->first_gpio;
-
- pinctrl_add_gpio_range(pmx->pctl, &sh_pfc_gpio_range);
-
- 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;
-}
projects / karo-tx-linux.git / blobdiff