348 lines
8.8 KiB
C
348 lines
8.8 KiB
C
/*
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* linux/drivers/pinctrl/pinctrl-lantiq.c
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* based on linux/drivers/pinctrl/pinctrl-pxa3xx.c
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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 version 2 as
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* publishhed by the Free Software Foundation.
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*
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* Copyright (C) 2012 John Crispin <john@phrozen.org>
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*/
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/io.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/of.h>
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#include "pinctrl-lantiq.h"
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static int ltq_get_group_count(struct pinctrl_dev *pctrldev)
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{
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struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
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return info->num_grps;
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}
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static const char *ltq_get_group_name(struct pinctrl_dev *pctrldev,
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unsigned selector)
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{
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struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
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if (selector >= info->num_grps)
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return NULL;
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return info->grps[selector].name;
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}
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static int ltq_get_group_pins(struct pinctrl_dev *pctrldev,
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unsigned selector,
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const unsigned **pins,
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unsigned *num_pins)
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{
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struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
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if (selector >= info->num_grps)
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return -EINVAL;
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*pins = info->grps[selector].pins;
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*num_pins = info->grps[selector].npins;
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return 0;
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}
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static void ltq_pinctrl_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 i;
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for (i = 0; i < num_maps; i++)
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if (map[i].type == PIN_MAP_TYPE_CONFIGS_PIN ||
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map[i].type == PIN_MAP_TYPE_CONFIGS_GROUP)
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kfree(map[i].data.configs.configs);
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kfree(map);
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}
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static void ltq_pinctrl_pin_dbg_show(struct pinctrl_dev *pctldev,
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struct seq_file *s,
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unsigned offset)
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{
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seq_printf(s, " %s", dev_name(pctldev->dev));
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}
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static void ltq_pinctrl_dt_subnode_to_map(struct pinctrl_dev *pctldev,
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struct device_node *np,
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struct pinctrl_map **map)
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{
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struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctldev);
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struct property *pins = of_find_property(np, "lantiq,pins", NULL);
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struct property *groups = of_find_property(np, "lantiq,groups", NULL);
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unsigned long configs[3];
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unsigned num_configs = 0;
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struct property *prop;
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const char *group, *pin;
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const char *function;
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int ret, i;
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if (!pins && !groups) {
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dev_err(pctldev->dev, "%s defines neither pins nor groups\n",
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np->name);
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return;
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}
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if (pins && groups) {
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dev_err(pctldev->dev, "%s defines both pins and groups\n",
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np->name);
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return;
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}
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ret = of_property_read_string(np, "lantiq,function", &function);
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if (groups && !ret) {
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of_property_for_each_string(np, "lantiq,groups", prop, group) {
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(*map)->type = PIN_MAP_TYPE_MUX_GROUP;
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(*map)->name = function;
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(*map)->data.mux.group = group;
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(*map)->data.mux.function = function;
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(*map)++;
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}
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}
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for (i = 0; i < info->num_params; i++) {
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u32 val;
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int ret = of_property_read_u32(np,
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info->params[i].property, &val);
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if (!ret)
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configs[num_configs++] =
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LTQ_PINCONF_PACK(info->params[i].param,
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val);
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}
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if (!num_configs)
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return;
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of_property_for_each_string(np, "lantiq,pins", prop, pin) {
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(*map)->data.configs.configs = kmemdup(configs,
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num_configs * sizeof(unsigned long),
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GFP_KERNEL);
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(*map)->type = PIN_MAP_TYPE_CONFIGS_PIN;
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(*map)->name = pin;
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(*map)->data.configs.group_or_pin = pin;
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(*map)->data.configs.num_configs = num_configs;
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(*map)++;
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}
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of_property_for_each_string(np, "lantiq,groups", prop, group) {
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(*map)->data.configs.configs = kmemdup(configs,
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num_configs * sizeof(unsigned long),
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GFP_KERNEL);
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(*map)->type = PIN_MAP_TYPE_CONFIGS_GROUP;
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(*map)->name = group;
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(*map)->data.configs.group_or_pin = group;
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(*map)->data.configs.num_configs = num_configs;
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(*map)++;
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}
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}
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static int ltq_pinctrl_dt_subnode_size(struct device_node *np)
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{
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int ret;
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ret = of_property_count_strings(np, "lantiq,groups");
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if (ret < 0)
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ret = of_property_count_strings(np, "lantiq,pins");
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return ret;
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}
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static int ltq_pinctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
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struct device_node *np_config,
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struct pinctrl_map **map,
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unsigned *num_maps)
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{
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struct pinctrl_map *tmp;
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struct device_node *np;
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int max_maps = 0;
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for_each_child_of_node(np_config, np)
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max_maps += ltq_pinctrl_dt_subnode_size(np);
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*map = kzalloc(array3_size(max_maps, sizeof(struct pinctrl_map), 2),
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GFP_KERNEL);
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if (!*map)
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return -ENOMEM;
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tmp = *map;
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for_each_child_of_node(np_config, np)
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ltq_pinctrl_dt_subnode_to_map(pctldev, np, &tmp);
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*num_maps = ((int)(tmp - *map));
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return 0;
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}
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static const struct pinctrl_ops ltq_pctrl_ops = {
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.get_groups_count = ltq_get_group_count,
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.get_group_name = ltq_get_group_name,
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.get_group_pins = ltq_get_group_pins,
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.pin_dbg_show = ltq_pinctrl_pin_dbg_show,
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.dt_node_to_map = ltq_pinctrl_dt_node_to_map,
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.dt_free_map = ltq_pinctrl_dt_free_map,
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};
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static int ltq_pmx_func_count(struct pinctrl_dev *pctrldev)
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{
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struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
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return info->num_funcs;
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}
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static const char *ltq_pmx_func_name(struct pinctrl_dev *pctrldev,
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unsigned selector)
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{
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struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
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if (selector >= info->num_funcs)
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return NULL;
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return info->funcs[selector].name;
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}
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static int ltq_pmx_get_groups(struct pinctrl_dev *pctrldev,
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unsigned func,
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const char * const **groups,
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unsigned * const num_groups)
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{
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struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
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*groups = info->funcs[func].groups;
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*num_groups = info->funcs[func].num_groups;
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return 0;
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}
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/* Return function number. If failure, return negative value. */
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static int match_mux(const struct ltq_mfp_pin *mfp, unsigned mux)
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{
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int i;
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for (i = 0; i < LTQ_MAX_MUX; i++) {
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if (mfp->func[i] == mux)
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break;
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}
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if (i >= LTQ_MAX_MUX)
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return -EINVAL;
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return i;
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}
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/* dont assume .mfp is linearly mapped. find the mfp with the correct .pin */
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static int match_mfp(const struct ltq_pinmux_info *info, int pin)
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{
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int i;
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for (i = 0; i < info->num_mfp; i++) {
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if (info->mfp[i].pin == pin)
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return i;
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}
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return -1;
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}
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/* check whether current pin configuration is valid. Negative for failure */
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static int match_group_mux(const struct ltq_pin_group *grp,
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const struct ltq_pinmux_info *info,
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unsigned mux)
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{
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int i, pin, ret = 0;
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for (i = 0; i < grp->npins; i++) {
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pin = match_mfp(info, grp->pins[i]);
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if (pin < 0) {
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dev_err(info->dev, "could not find mfp for pin %d\n",
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grp->pins[i]);
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return -EINVAL;
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}
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ret = match_mux(&info->mfp[pin], mux);
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if (ret < 0) {
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dev_err(info->dev, "Can't find mux %d on pin%d\n",
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mux, pin);
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break;
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}
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}
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return ret;
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}
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static int ltq_pmx_set(struct pinctrl_dev *pctrldev,
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unsigned func,
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unsigned group)
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{
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struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
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const struct ltq_pin_group *pin_grp = &info->grps[group];
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int i, pin, pin_func, ret;
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if (!pin_grp->npins ||
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(match_group_mux(pin_grp, info, pin_grp->mux) < 0)) {
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dev_err(info->dev, "Failed to set the pin group: %s\n",
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info->grps[group].name);
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return -EINVAL;
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}
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for (i = 0; i < pin_grp->npins; i++) {
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pin = match_mfp(info, pin_grp->pins[i]);
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if (pin < 0) {
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dev_err(info->dev, "could not find mfp for pin %d\n",
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pin_grp->pins[i]);
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return -EINVAL;
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}
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pin_func = match_mux(&info->mfp[pin], pin_grp->mux);
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ret = info->apply_mux(pctrldev, pin, pin_func);
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if (ret) {
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dev_err(info->dev,
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"failed to apply mux %d for pin %d\n",
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pin_func, pin);
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return ret;
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}
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}
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return 0;
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}
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static int ltq_pmx_gpio_request_enable(struct pinctrl_dev *pctrldev,
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struct pinctrl_gpio_range *range,
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unsigned pin)
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{
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struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
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int mfp = match_mfp(info, pin);
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int pin_func;
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if (mfp < 0) {
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dev_err(info->dev, "could not find mfp for pin %d\n", pin);
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return -EINVAL;
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}
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pin_func = match_mux(&info->mfp[mfp], 0);
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if (pin_func < 0) {
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dev_err(info->dev, "No GPIO function on pin%d\n", mfp);
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return -EINVAL;
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}
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return info->apply_mux(pctrldev, mfp, pin_func);
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}
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static const struct pinmux_ops ltq_pmx_ops = {
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.get_functions_count = ltq_pmx_func_count,
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.get_function_name = ltq_pmx_func_name,
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.get_function_groups = ltq_pmx_get_groups,
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.set_mux = ltq_pmx_set,
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.gpio_request_enable = ltq_pmx_gpio_request_enable,
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};
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/*
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* allow different socs to register with the generic part of the lanti
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* pinctrl code
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*/
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int ltq_pinctrl_register(struct platform_device *pdev,
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struct ltq_pinmux_info *info)
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{
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struct pinctrl_desc *desc;
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if (!info)
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return -EINVAL;
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desc = info->desc;
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desc->pctlops = <q_pctrl_ops;
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desc->pmxops = <q_pmx_ops;
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info->dev = &pdev->dev;
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info->pctrl = devm_pinctrl_register(&pdev->dev, desc, info);
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if (IS_ERR(info->pctrl)) {
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dev_err(&pdev->dev, "failed to register LTQ pinmux driver\n");
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return PTR_ERR(info->pctrl);
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}
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platform_set_drvdata(pdev, info);
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return 0;
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}
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