mirror of https://gitee.com/openkylin/linux.git
889 lines
24 KiB
C
889 lines
24 KiB
C
/*
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* pin-controller/pin-mux/pin-config/gpio-driver for Samsung's SoC's.
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*
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* Copyright (c) 2012 Samsung Electronics Co., Ltd.
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* http://www.samsung.com
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* Copyright (c) 2012 Linaro Ltd
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* http://www.linaro.org
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*
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* Author: Thomas Abraham <thomas.ab@samsung.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This driver implements the Samsung pinctrl driver. It supports setting up of
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* pinmux and pinconf configurations. The gpiolib interface is also included.
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* External interrupt (gpio and wakeup) support are not included in this driver
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* but provides extensions to which platform specific implementation of the gpio
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* and wakeup interrupts can be hooked to.
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*/
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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#include <linux/err.h>
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#include <linux/gpio.h>
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#include "core.h"
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#include "pinctrl-samsung.h"
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#define GROUP_SUFFIX "-grp"
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#define GSUFFIX_LEN sizeof(GROUP_SUFFIX)
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#define FUNCTION_SUFFIX "-mux"
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#define FSUFFIX_LEN sizeof(FUNCTION_SUFFIX)
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/* list of all possible config options supported */
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struct pin_config {
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char *prop_cfg;
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unsigned int cfg_type;
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} pcfgs[] = {
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{ "samsung,pin-pud", PINCFG_TYPE_PUD },
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{ "samsung,pin-drv", PINCFG_TYPE_DRV },
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{ "samsung,pin-con-pdn", PINCFG_TYPE_CON_PDN },
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{ "samsung,pin-pud-pdn", PINCFG_TYPE_PUD_PDN },
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};
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/* check if the selector is a valid pin group selector */
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static int samsung_get_group_count(struct pinctrl_dev *pctldev)
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{
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struct samsung_pinctrl_drv_data *drvdata;
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drvdata = pinctrl_dev_get_drvdata(pctldev);
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return drvdata->nr_groups;
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}
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/* return the name of the group selected by the group selector */
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static const char *samsung_get_group_name(struct pinctrl_dev *pctldev,
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unsigned selector)
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{
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struct samsung_pinctrl_drv_data *drvdata;
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drvdata = pinctrl_dev_get_drvdata(pctldev);
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return drvdata->pin_groups[selector].name;
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}
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/* return the pin numbers associated with the specified group */
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static int samsung_get_group_pins(struct pinctrl_dev *pctldev,
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unsigned selector, const unsigned **pins, unsigned *num_pins)
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{
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struct samsung_pinctrl_drv_data *drvdata;
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drvdata = pinctrl_dev_get_drvdata(pctldev);
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*pins = drvdata->pin_groups[selector].pins;
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*num_pins = drvdata->pin_groups[selector].num_pins;
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return 0;
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}
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/* create pinctrl_map entries by parsing device tree nodes */
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static int samsung_dt_node_to_map(struct pinctrl_dev *pctldev,
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struct device_node *np, struct pinctrl_map **maps,
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unsigned *nmaps)
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{
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struct device *dev = pctldev->dev;
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struct pinctrl_map *map;
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unsigned long *cfg = NULL;
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char *gname, *fname;
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int cfg_cnt = 0, map_cnt = 0, idx = 0;
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/* count the number of config options specfied in the node */
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for (idx = 0; idx < ARRAY_SIZE(pcfgs); idx++) {
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if (of_find_property(np, pcfgs[idx].prop_cfg, NULL))
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cfg_cnt++;
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}
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/*
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* Find out the number of map entries to create. All the config options
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* can be accomadated into a single config map entry.
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*/
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if (cfg_cnt)
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map_cnt = 1;
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if (of_find_property(np, "samsung,pin-function", NULL))
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map_cnt++;
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if (!map_cnt) {
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dev_err(dev, "node %s does not have either config or function "
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"configurations\n", np->name);
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return -EINVAL;
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}
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/* Allocate memory for pin-map entries */
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map = kzalloc(sizeof(*map) * map_cnt, GFP_KERNEL);
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if (!map) {
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dev_err(dev, "could not alloc memory for pin-maps\n");
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return -ENOMEM;
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}
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*nmaps = 0;
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/*
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* Allocate memory for pin group name. The pin group name is derived
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* from the node name from which these map entries are be created.
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*/
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gname = kzalloc(strlen(np->name) + GSUFFIX_LEN, GFP_KERNEL);
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if (!gname) {
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dev_err(dev, "failed to alloc memory for group name\n");
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goto free_map;
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}
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sprintf(gname, "%s%s", np->name, GROUP_SUFFIX);
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/*
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* don't have config options? then skip over to creating function
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* map entries.
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*/
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if (!cfg_cnt)
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goto skip_cfgs;
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/* Allocate memory for config entries */
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cfg = kzalloc(sizeof(*cfg) * cfg_cnt, GFP_KERNEL);
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if (!cfg) {
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dev_err(dev, "failed to alloc memory for configs\n");
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goto free_gname;
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}
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/* Prepare a list of config settings */
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for (idx = 0, cfg_cnt = 0; idx < ARRAY_SIZE(pcfgs); idx++) {
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u32 value;
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if (!of_property_read_u32(np, pcfgs[idx].prop_cfg, &value))
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cfg[cfg_cnt++] =
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PINCFG_PACK(pcfgs[idx].cfg_type, value);
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}
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/* create the config map entry */
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map[*nmaps].data.configs.group_or_pin = gname;
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map[*nmaps].data.configs.configs = cfg;
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map[*nmaps].data.configs.num_configs = cfg_cnt;
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map[*nmaps].type = PIN_MAP_TYPE_CONFIGS_GROUP;
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*nmaps += 1;
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skip_cfgs:
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/* create the function map entry */
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if (of_find_property(np, "samsung,pin-function", NULL)) {
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fname = kzalloc(strlen(np->name) + FSUFFIX_LEN, GFP_KERNEL);
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if (!fname) {
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dev_err(dev, "failed to alloc memory for func name\n");
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goto free_cfg;
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}
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sprintf(fname, "%s%s", np->name, FUNCTION_SUFFIX);
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map[*nmaps].data.mux.group = gname;
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map[*nmaps].data.mux.function = fname;
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map[*nmaps].type = PIN_MAP_TYPE_MUX_GROUP;
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*nmaps += 1;
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}
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*maps = map;
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return 0;
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free_cfg:
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kfree(cfg);
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free_gname:
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kfree(gname);
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free_map:
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kfree(map);
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return -ENOMEM;
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}
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/* free the memory allocated to hold the pin-map table */
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static void samsung_dt_free_map(struct pinctrl_dev *pctldev,
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struct pinctrl_map *map, unsigned num_maps)
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{
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int idx;
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for (idx = 0; idx < num_maps; idx++) {
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if (map[idx].type == PIN_MAP_TYPE_MUX_GROUP) {
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kfree(map[idx].data.mux.function);
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if (!idx)
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kfree(map[idx].data.mux.group);
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} else if (map->type == PIN_MAP_TYPE_CONFIGS_GROUP) {
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kfree(map[idx].data.configs.configs);
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if (!idx)
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kfree(map[idx].data.configs.group_or_pin);
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}
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};
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kfree(map);
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}
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/* list of pinctrl callbacks for the pinctrl core */
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static struct pinctrl_ops samsung_pctrl_ops = {
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.get_groups_count = samsung_get_group_count,
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.get_group_name = samsung_get_group_name,
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.get_group_pins = samsung_get_group_pins,
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.dt_node_to_map = samsung_dt_node_to_map,
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.dt_free_map = samsung_dt_free_map,
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};
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/* check if the selector is a valid pin function selector */
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static int samsung_get_functions_count(struct pinctrl_dev *pctldev)
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{
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struct samsung_pinctrl_drv_data *drvdata;
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drvdata = pinctrl_dev_get_drvdata(pctldev);
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return drvdata->nr_functions;
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}
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/* return the name of the pin function specified */
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static const char *samsung_pinmux_get_fname(struct pinctrl_dev *pctldev,
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unsigned selector)
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{
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struct samsung_pinctrl_drv_data *drvdata;
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drvdata = pinctrl_dev_get_drvdata(pctldev);
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return drvdata->pmx_functions[selector].name;
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}
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/* return the groups associated for the specified function selector */
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static int samsung_pinmux_get_groups(struct pinctrl_dev *pctldev,
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unsigned selector, const char * const **groups,
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unsigned * const num_groups)
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{
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struct samsung_pinctrl_drv_data *drvdata;
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drvdata = pinctrl_dev_get_drvdata(pctldev);
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*groups = drvdata->pmx_functions[selector].groups;
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*num_groups = drvdata->pmx_functions[selector].num_groups;
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return 0;
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}
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/*
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* given a pin number that is local to a pin controller, find out the pin bank
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* and the register base of the pin bank.
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*/
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static void pin_to_reg_bank(struct gpio_chip *gc, unsigned pin,
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void __iomem **reg, u32 *offset,
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struct samsung_pin_bank **bank)
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{
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struct samsung_pinctrl_drv_data *drvdata;
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struct samsung_pin_bank *b;
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drvdata = dev_get_drvdata(gc->dev);
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b = drvdata->ctrl->pin_banks;
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while ((pin >= b->pin_base) &&
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((b->pin_base + b->nr_pins - 1) < pin))
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b++;
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*reg = drvdata->virt_base + b->pctl_offset;
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*offset = pin - b->pin_base;
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if (bank)
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*bank = b;
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/* some banks have two config registers in a single bank */
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if (*offset * b->func_width > BITS_PER_LONG)
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*reg += 4;
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}
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/* enable or disable a pinmux function */
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static void samsung_pinmux_setup(struct pinctrl_dev *pctldev, unsigned selector,
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unsigned group, bool enable)
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{
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struct samsung_pinctrl_drv_data *drvdata;
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const unsigned int *pins;
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struct samsung_pin_bank *bank;
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void __iomem *reg;
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u32 mask, shift, data, pin_offset, cnt;
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drvdata = pinctrl_dev_get_drvdata(pctldev);
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pins = drvdata->pin_groups[group].pins;
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/*
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* for each pin in the pin group selected, program the correspoding pin
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* pin function number in the config register.
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*/
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for (cnt = 0; cnt < drvdata->pin_groups[group].num_pins; cnt++) {
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pin_to_reg_bank(drvdata->gc, pins[cnt] - drvdata->ctrl->base,
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®, &pin_offset, &bank);
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mask = (1 << bank->func_width) - 1;
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shift = pin_offset * bank->func_width;
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data = readl(reg);
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data &= ~(mask << shift);
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if (enable)
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data |= drvdata->pin_groups[group].func << shift;
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writel(data, reg);
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}
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}
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/* enable a specified pinmux by writing to registers */
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static int samsung_pinmux_enable(struct pinctrl_dev *pctldev, unsigned selector,
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unsigned group)
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{
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samsung_pinmux_setup(pctldev, selector, group, true);
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return 0;
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}
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/* disable a specified pinmux by writing to registers */
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static void samsung_pinmux_disable(struct pinctrl_dev *pctldev,
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unsigned selector, unsigned group)
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{
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samsung_pinmux_setup(pctldev, selector, group, false);
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}
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/*
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* The calls to gpio_direction_output() and gpio_direction_input()
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* leads to this function call (via the pinctrl_gpio_direction_{input|output}()
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* function called from the gpiolib interface).
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*/
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static int samsung_pinmux_gpio_set_direction(struct pinctrl_dev *pctldev,
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struct pinctrl_gpio_range *range, unsigned offset, bool input)
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{
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struct samsung_pin_bank *bank;
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void __iomem *reg;
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u32 data, pin_offset, mask, shift;
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pin_to_reg_bank(range->gc, offset, ®, &pin_offset, &bank);
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mask = (1 << bank->func_width) - 1;
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shift = pin_offset * bank->func_width;
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data = readl(reg);
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data &= ~(mask << shift);
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if (!input)
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data |= FUNC_OUTPUT << shift;
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writel(data, reg);
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return 0;
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}
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/* list of pinmux callbacks for the pinmux vertical in pinctrl core */
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static struct pinmux_ops samsung_pinmux_ops = {
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.get_functions_count = samsung_get_functions_count,
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.get_function_name = samsung_pinmux_get_fname,
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.get_function_groups = samsung_pinmux_get_groups,
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.enable = samsung_pinmux_enable,
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.disable = samsung_pinmux_disable,
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.gpio_set_direction = samsung_pinmux_gpio_set_direction,
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};
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/* set or get the pin config settings for a specified pin */
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static int samsung_pinconf_rw(struct pinctrl_dev *pctldev, unsigned int pin,
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unsigned long *config, bool set)
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{
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struct samsung_pinctrl_drv_data *drvdata;
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struct samsung_pin_bank *bank;
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void __iomem *reg_base;
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enum pincfg_type cfg_type = PINCFG_UNPACK_TYPE(*config);
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u32 data, width, pin_offset, mask, shift;
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u32 cfg_value, cfg_reg;
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drvdata = pinctrl_dev_get_drvdata(pctldev);
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pin_to_reg_bank(drvdata->gc, pin - drvdata->ctrl->base, ®_base,
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&pin_offset, &bank);
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switch (cfg_type) {
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case PINCFG_TYPE_PUD:
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width = bank->pud_width;
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cfg_reg = PUD_REG;
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break;
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case PINCFG_TYPE_DRV:
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width = bank->drv_width;
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cfg_reg = DRV_REG;
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break;
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case PINCFG_TYPE_CON_PDN:
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width = bank->conpdn_width;
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cfg_reg = CONPDN_REG;
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break;
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case PINCFG_TYPE_PUD_PDN:
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width = bank->pudpdn_width;
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cfg_reg = PUDPDN_REG;
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break;
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default:
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WARN_ON(1);
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return -EINVAL;
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}
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mask = (1 << width) - 1;
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shift = pin_offset * width;
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data = readl(reg_base + cfg_reg);
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if (set) {
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cfg_value = PINCFG_UNPACK_VALUE(*config);
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data &= ~(mask << shift);
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data |= (cfg_value << shift);
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writel(data, reg_base + cfg_reg);
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} else {
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data >>= shift;
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data &= mask;
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*config = PINCFG_PACK(cfg_type, data);
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}
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return 0;
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}
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/* set the pin config settings for a specified pin */
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static int samsung_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
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unsigned long config)
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{
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return samsung_pinconf_rw(pctldev, pin, &config, true);
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}
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/* get the pin config settings for a specified pin */
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static int samsung_pinconf_get(struct pinctrl_dev *pctldev, unsigned int pin,
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unsigned long *config)
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{
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return samsung_pinconf_rw(pctldev, pin, config, false);
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}
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/* set the pin config settings for a specified pin group */
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static int samsung_pinconf_group_set(struct pinctrl_dev *pctldev,
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unsigned group, unsigned long config)
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{
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struct samsung_pinctrl_drv_data *drvdata;
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const unsigned int *pins;
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unsigned int cnt;
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drvdata = pinctrl_dev_get_drvdata(pctldev);
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pins = drvdata->pin_groups[group].pins;
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for (cnt = 0; cnt < drvdata->pin_groups[group].num_pins; cnt++)
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samsung_pinconf_set(pctldev, pins[cnt], config);
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return 0;
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}
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/* get the pin config settings for a specified pin group */
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static int samsung_pinconf_group_get(struct pinctrl_dev *pctldev,
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unsigned int group, unsigned long *config)
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{
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struct samsung_pinctrl_drv_data *drvdata;
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const unsigned int *pins;
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drvdata = pinctrl_dev_get_drvdata(pctldev);
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pins = drvdata->pin_groups[group].pins;
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samsung_pinconf_get(pctldev, pins[0], config);
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return 0;
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}
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/* list of pinconfig callbacks for pinconfig vertical in the pinctrl code */
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static struct pinconf_ops samsung_pinconf_ops = {
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.pin_config_get = samsung_pinconf_get,
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.pin_config_set = samsung_pinconf_set,
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.pin_config_group_get = samsung_pinconf_group_get,
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.pin_config_group_set = samsung_pinconf_group_set,
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};
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/* gpiolib gpio_set callback function */
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static void samsung_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
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{
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void __iomem *reg;
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u32 pin_offset, data;
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pin_to_reg_bank(gc, offset, ®, &pin_offset, NULL);
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data = readl(reg + DAT_REG);
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data &= ~(1 << pin_offset);
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if (value)
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data |= 1 << pin_offset;
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writel(data, reg + DAT_REG);
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}
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/* gpiolib gpio_get callback function */
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static int samsung_gpio_get(struct gpio_chip *gc, unsigned offset)
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{
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void __iomem *reg;
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u32 pin_offset, data;
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|
|
pin_to_reg_bank(gc, offset, ®, &pin_offset, NULL);
|
|
data = readl(reg + DAT_REG);
|
|
data >>= pin_offset;
|
|
data &= 1;
|
|
return data;
|
|
}
|
|
|
|
/*
|
|
* gpiolib gpio_direction_input callback function. The setting of the pin
|
|
* mux function as 'gpio input' will be handled by the pinctrl susbsystem
|
|
* interface.
|
|
*/
|
|
static int samsung_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
|
|
{
|
|
return pinctrl_gpio_direction_input(gc->base + offset);
|
|
}
|
|
|
|
/*
|
|
* gpiolib gpio_direction_output callback function. The setting of the pin
|
|
* mux function as 'gpio output' will be handled by the pinctrl susbsystem
|
|
* interface.
|
|
*/
|
|
static int samsung_gpio_direction_output(struct gpio_chip *gc, unsigned offset,
|
|
int value)
|
|
{
|
|
samsung_gpio_set(gc, offset, value);
|
|
return pinctrl_gpio_direction_output(gc->base + offset);
|
|
}
|
|
|
|
/*
|
|
* Parse the pin names listed in the 'samsung,pins' property and convert it
|
|
* into a list of gpio numbers are create a pin group from it.
|
|
*/
|
|
static int __devinit samsung_pinctrl_parse_dt_pins(struct platform_device *pdev,
|
|
struct device_node *cfg_np, struct pinctrl_desc *pctl,
|
|
unsigned int **pin_list, unsigned int *npins)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct property *prop;
|
|
struct pinctrl_pin_desc const *pdesc = pctl->pins;
|
|
unsigned int idx = 0, cnt;
|
|
const char *pin_name;
|
|
|
|
*npins = of_property_count_strings(cfg_np, "samsung,pins");
|
|
if (*npins < 0) {
|
|
dev_err(dev, "invalid pin list in %s node", cfg_np->name);
|
|
return -EINVAL;
|
|
}
|
|
|
|
*pin_list = devm_kzalloc(dev, *npins * sizeof(**pin_list), GFP_KERNEL);
|
|
if (!*pin_list) {
|
|
dev_err(dev, "failed to allocate memory for pin list\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
of_property_for_each_string(cfg_np, "samsung,pins", prop, pin_name) {
|
|
for (cnt = 0; cnt < pctl->npins; cnt++) {
|
|
if (pdesc[cnt].name) {
|
|
if (!strcmp(pin_name, pdesc[cnt].name)) {
|
|
(*pin_list)[idx++] = pdesc[cnt].number;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
if (cnt == pctl->npins) {
|
|
dev_err(dev, "pin %s not valid in %s node\n",
|
|
pin_name, cfg_np->name);
|
|
devm_kfree(dev, *pin_list);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Parse the information about all the available pin groups and pin functions
|
|
* from device node of the pin-controller. A pin group is formed with all
|
|
* the pins listed in the "samsung,pins" property.
|
|
*/
|
|
static int __devinit samsung_pinctrl_parse_dt(struct platform_device *pdev,
|
|
struct samsung_pinctrl_drv_data *drvdata)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct device_node *dev_np = dev->of_node;
|
|
struct device_node *cfg_np;
|
|
struct samsung_pin_group *groups, *grp;
|
|
struct samsung_pmx_func *functions, *func;
|
|
unsigned *pin_list;
|
|
unsigned int npins, grp_cnt, func_idx = 0;
|
|
char *gname, *fname;
|
|
int ret;
|
|
|
|
grp_cnt = of_get_child_count(dev_np);
|
|
if (!grp_cnt)
|
|
return -EINVAL;
|
|
|
|
groups = devm_kzalloc(dev, grp_cnt * sizeof(*groups), GFP_KERNEL);
|
|
if (!groups) {
|
|
dev_err(dev, "failed allocate memory for ping group list\n");
|
|
return -EINVAL;
|
|
}
|
|
grp = groups;
|
|
|
|
functions = devm_kzalloc(dev, grp_cnt * sizeof(*functions), GFP_KERNEL);
|
|
if (!functions) {
|
|
dev_err(dev, "failed to allocate memory for function list\n");
|
|
return -EINVAL;
|
|
}
|
|
func = functions;
|
|
|
|
/*
|
|
* Iterate over all the child nodes of the pin controller node
|
|
* and create pin groups and pin function lists.
|
|
*/
|
|
for_each_child_of_node(dev_np, cfg_np) {
|
|
u32 function;
|
|
if (of_find_property(cfg_np, "interrupt-controller", NULL))
|
|
continue;
|
|
|
|
ret = samsung_pinctrl_parse_dt_pins(pdev, cfg_np,
|
|
&drvdata->pctl, &pin_list, &npins);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* derive pin group name from the node name */
|
|
gname = devm_kzalloc(dev, strlen(cfg_np->name) + GSUFFIX_LEN,
|
|
GFP_KERNEL);
|
|
if (!gname) {
|
|
dev_err(dev, "failed to alloc memory for group name\n");
|
|
return -ENOMEM;
|
|
}
|
|
sprintf(gname, "%s%s", cfg_np->name, GROUP_SUFFIX);
|
|
|
|
grp->name = gname;
|
|
grp->pins = pin_list;
|
|
grp->num_pins = npins;
|
|
of_property_read_u32(cfg_np, "samsung,pin-function", &function);
|
|
grp->func = function;
|
|
grp++;
|
|
|
|
if (!of_find_property(cfg_np, "samsung,pin-function", NULL))
|
|
continue;
|
|
|
|
/* derive function name from the node name */
|
|
fname = devm_kzalloc(dev, strlen(cfg_np->name) + FSUFFIX_LEN,
|
|
GFP_KERNEL);
|
|
if (!fname) {
|
|
dev_err(dev, "failed to alloc memory for func name\n");
|
|
return -ENOMEM;
|
|
}
|
|
sprintf(fname, "%s%s", cfg_np->name, FUNCTION_SUFFIX);
|
|
|
|
func->name = fname;
|
|
func->groups = devm_kzalloc(dev, sizeof(char *), GFP_KERNEL);
|
|
if (!func->groups) {
|
|
dev_err(dev, "failed to alloc memory for group list "
|
|
"in pin function");
|
|
return -ENOMEM;
|
|
}
|
|
func->groups[0] = gname;
|
|
func->num_groups = 1;
|
|
func++;
|
|
func_idx++;
|
|
}
|
|
|
|
drvdata->pin_groups = groups;
|
|
drvdata->nr_groups = grp_cnt;
|
|
drvdata->pmx_functions = functions;
|
|
drvdata->nr_functions = func_idx;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* register the pinctrl interface with the pinctrl subsystem */
|
|
static int __devinit samsung_pinctrl_register(struct platform_device *pdev,
|
|
struct samsung_pinctrl_drv_data *drvdata)
|
|
{
|
|
struct pinctrl_desc *ctrldesc = &drvdata->pctl;
|
|
struct pinctrl_pin_desc *pindesc, *pdesc;
|
|
struct samsung_pin_bank *pin_bank;
|
|
char *pin_names;
|
|
int pin, bank, ret;
|
|
|
|
ctrldesc->name = "samsung-pinctrl";
|
|
ctrldesc->owner = THIS_MODULE;
|
|
ctrldesc->pctlops = &samsung_pctrl_ops;
|
|
ctrldesc->pmxops = &samsung_pinmux_ops;
|
|
ctrldesc->confops = &samsung_pinconf_ops;
|
|
|
|
pindesc = devm_kzalloc(&pdev->dev, sizeof(*pindesc) *
|
|
drvdata->ctrl->nr_pins, GFP_KERNEL);
|
|
if (!pindesc) {
|
|
dev_err(&pdev->dev, "mem alloc for pin descriptors failed\n");
|
|
return -ENOMEM;
|
|
}
|
|
ctrldesc->pins = pindesc;
|
|
ctrldesc->npins = drvdata->ctrl->nr_pins;
|
|
ctrldesc->npins = drvdata->ctrl->nr_pins;
|
|
|
|
/* dynamically populate the pin number and pin name for pindesc */
|
|
for (pin = 0, pdesc = pindesc; pin < ctrldesc->npins; pin++, pdesc++)
|
|
pdesc->number = pin + drvdata->ctrl->base;
|
|
|
|
/*
|
|
* allocate space for storing the dynamically generated names for all
|
|
* the pins which belong to this pin-controller.
|
|
*/
|
|
pin_names = devm_kzalloc(&pdev->dev, sizeof(char) * PIN_NAME_LENGTH *
|
|
drvdata->ctrl->nr_pins, GFP_KERNEL);
|
|
if (!pin_names) {
|
|
dev_err(&pdev->dev, "mem alloc for pin names failed\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* for each pin, the name of the pin is pin-bank name + pin number */
|
|
for (bank = 0; bank < drvdata->ctrl->nr_banks; bank++) {
|
|
pin_bank = &drvdata->ctrl->pin_banks[bank];
|
|
for (pin = 0; pin < pin_bank->nr_pins; pin++) {
|
|
sprintf(pin_names, "%s-%d", pin_bank->name, pin);
|
|
pdesc = pindesc + pin_bank->pin_base + pin;
|
|
pdesc->name = pin_names;
|
|
pin_names += PIN_NAME_LENGTH;
|
|
}
|
|
}
|
|
|
|
drvdata->pctl_dev = pinctrl_register(ctrldesc, &pdev->dev, drvdata);
|
|
if (!drvdata->pctl_dev) {
|
|
dev_err(&pdev->dev, "could not register pinctrl driver\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
drvdata->grange.name = "samsung-pctrl-gpio-range";
|
|
drvdata->grange.id = 0;
|
|
drvdata->grange.base = drvdata->ctrl->base;
|
|
drvdata->grange.npins = drvdata->ctrl->nr_pins;
|
|
drvdata->grange.gc = drvdata->gc;
|
|
pinctrl_add_gpio_range(drvdata->pctl_dev, &drvdata->grange);
|
|
|
|
ret = samsung_pinctrl_parse_dt(pdev, drvdata);
|
|
if (ret) {
|
|
pinctrl_unregister(drvdata->pctl_dev);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* register the gpiolib interface with the gpiolib subsystem */
|
|
static int __devinit samsung_gpiolib_register(struct platform_device *pdev,
|
|
struct samsung_pinctrl_drv_data *drvdata)
|
|
{
|
|
struct gpio_chip *gc;
|
|
int ret;
|
|
|
|
gc = devm_kzalloc(&pdev->dev, sizeof(*gc), GFP_KERNEL);
|
|
if (!gc) {
|
|
dev_err(&pdev->dev, "mem alloc for gpio_chip failed\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
drvdata->gc = gc;
|
|
gc->base = drvdata->ctrl->base;
|
|
gc->ngpio = drvdata->ctrl->nr_pins;
|
|
gc->dev = &pdev->dev;
|
|
gc->set = samsung_gpio_set;
|
|
gc->get = samsung_gpio_get;
|
|
gc->direction_input = samsung_gpio_direction_input;
|
|
gc->direction_output = samsung_gpio_direction_output;
|
|
gc->label = drvdata->ctrl->label;
|
|
gc->owner = THIS_MODULE;
|
|
ret = gpiochip_add(gc);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "failed to register gpio_chip %s, error "
|
|
"code: %d\n", gc->label, ret);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* unregister the gpiolib interface with the gpiolib subsystem */
|
|
static int __devinit samsung_gpiolib_unregister(struct platform_device *pdev,
|
|
struct samsung_pinctrl_drv_data *drvdata)
|
|
{
|
|
int ret = gpiochip_remove(drvdata->gc);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "gpio chip remove failed\n");
|
|
return ret;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id samsung_pinctrl_dt_match[];
|
|
|
|
/* retrieve the soc specific data */
|
|
static struct samsung_pin_ctrl *samsung_pinctrl_get_soc_data(
|
|
struct platform_device *pdev)
|
|
{
|
|
int id;
|
|
const struct of_device_id *match;
|
|
const struct device_node *node = pdev->dev.of_node;
|
|
|
|
id = of_alias_get_id(pdev->dev.of_node, "pinctrl");
|
|
if (id < 0) {
|
|
dev_err(&pdev->dev, "failed to get alias id\n");
|
|
return NULL;
|
|
}
|
|
match = of_match_node(samsung_pinctrl_dt_match, node);
|
|
return (struct samsung_pin_ctrl *)match->data + id;
|
|
}
|
|
|
|
static int __devinit samsung_pinctrl_probe(struct platform_device *pdev)
|
|
{
|
|
struct samsung_pinctrl_drv_data *drvdata;
|
|
struct device *dev = &pdev->dev;
|
|
struct samsung_pin_ctrl *ctrl;
|
|
struct resource *res;
|
|
int ret;
|
|
|
|
if (!dev->of_node) {
|
|
dev_err(dev, "device tree node not found\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
ctrl = samsung_pinctrl_get_soc_data(pdev);
|
|
if (!ctrl) {
|
|
dev_err(&pdev->dev, "driver data not available\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
|
|
if (!drvdata) {
|
|
dev_err(dev, "failed to allocate memory for driver's "
|
|
"private data\n");
|
|
return -ENOMEM;
|
|
}
|
|
drvdata->ctrl = ctrl;
|
|
drvdata->dev = dev;
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (!res) {
|
|
dev_err(dev, "cannot find IO resource\n");
|
|
return -ENOENT;
|
|
}
|
|
|
|
drvdata->virt_base = devm_request_and_ioremap(&pdev->dev, res);
|
|
if (!drvdata->virt_base) {
|
|
dev_err(dev, "ioremap failed\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
|
|
if (res)
|
|
drvdata->irq = res->start;
|
|
|
|
ret = samsung_gpiolib_register(pdev, drvdata);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = samsung_pinctrl_register(pdev, drvdata);
|
|
if (ret) {
|
|
samsung_gpiolib_unregister(pdev, drvdata);
|
|
return ret;
|
|
}
|
|
|
|
if (ctrl->eint_gpio_init)
|
|
ctrl->eint_gpio_init(drvdata);
|
|
if (ctrl->eint_wkup_init)
|
|
ctrl->eint_wkup_init(drvdata);
|
|
|
|
platform_set_drvdata(pdev, drvdata);
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id samsung_pinctrl_dt_match[] = {
|
|
{ .compatible = "samsung,pinctrl-exynos4210",
|
|
.data = (void *)exynos4210_pin_ctrl },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, samsung_pinctrl_dt_match);
|
|
|
|
static struct platform_driver samsung_pinctrl_driver = {
|
|
.probe = samsung_pinctrl_probe,
|
|
.driver = {
|
|
.name = "samsung-pinctrl",
|
|
.owner = THIS_MODULE,
|
|
.of_match_table = of_match_ptr(samsung_pinctrl_dt_match),
|
|
},
|
|
};
|
|
|
|
static int __init samsung_pinctrl_drv_register(void)
|
|
{
|
|
return platform_driver_register(&samsung_pinctrl_driver);
|
|
}
|
|
postcore_initcall(samsung_pinctrl_drv_register);
|
|
|
|
static void __exit samsung_pinctrl_drv_unregister(void)
|
|
{
|
|
platform_driver_unregister(&samsung_pinctrl_driver);
|
|
}
|
|
module_exit(samsung_pinctrl_drv_unregister);
|
|
|
|
MODULE_AUTHOR("Thomas Abraham <thomas.ab@samsung.com>");
|
|
MODULE_DESCRIPTION("Samsung pinctrl driver");
|
|
MODULE_LICENSE("GPL v2");
|