--- /dev/null
+/*
+ * 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 (!info->pctrl) {
+ dev_err(&pdev->dev, "failed to register LTQ pinmux driver\n");
+ return -EINVAL;
+ }
+ platform_set_drvdata(pdev, info);
+ return 0;
+}
Code Review / kvmfornfv.git / blobdiff