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