1 files changed, 477 insertions, 46 deletions

diff --git a/drivers/net/pse-pd/pse_core.c b/drivers/net/pse-pd/pse_core.c
index 146b81f08a89..795ab264eaf2 100644
--- a/drivers/net/pse-pd/pse_core.c
+++ b/drivers/net/pse-pd/pse_core.c
@@ -8,6 +8,8 @@
 #include <linux/device.h>
 #include <linux/of.h>
 #include <linux/pse-pd/pse.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
 
 static DEFINE_MUTEX(pse_list_mutex);
 static LIST_HEAD(pse_controller_list);
@@ -16,67 +18,357 @@ static LIST_HEAD(pse_controller_list);
  * struct pse_control - a PSE control
  * @pcdev: a pointer to the PSE controller device
  *         this PSE control belongs to
+ * @ps: PSE PI supply of the PSE control
  * @list: list entry for the pcdev's PSE controller list
  * @id: ID of the PSE line in the PSE controller device
  * @refcnt: Number of gets of this pse_control
  */
 struct pse_control {
 	struct pse_controller_dev *pcdev;
+	struct regulator *ps;
 	struct list_head list;
 	unsigned int id;
 	struct kref refcnt;
 };
 
+static int of_load_single_pse_pi_pairset(struct device_node *node,
+					 struct pse_pi *pi,
+					 int pairset_num)
+{
+	struct device_node *pairset_np;
+	const char *name;
+	int ret;
+
+	ret = of_property_read_string_index(node, "pairset-names",
+					    pairset_num, &name);
+	if (ret)
+		return ret;
+
+	if (!strcmp(name, "alternative-a")) {
+		pi->pairset[pairset_num].pinout = ALTERNATIVE_A;
+	} else if (!strcmp(name, "alternative-b")) {
+		pi->pairset[pairset_num].pinout = ALTERNATIVE_B;
+	} else {
+		pr_err("pse: wrong pairset-names value %s (%pOF)\n",
+		       name, node);
+		return -EINVAL;
+	}
+
+	pairset_np = of_parse_phandle(node, "pairsets", pairset_num);
+	if (!pairset_np)
+		return -ENODEV;
+
+	pi->pairset[pairset_num].np = pairset_np;
+
+	return 0;
+}
+
 /**
- * of_pse_zero_xlate - dummy function for controllers with one only control
- * @pcdev: a pointer to the PSE controller device
- * @pse_spec: PSE line specifier as found in the device tree
+ * of_load_pse_pi_pairsets - load PSE PI pairsets pinout and polarity
+ * @node: a pointer of the device node
+ * @pi: a pointer of the PSE PI to fill
+ * @npairsets: the number of pairsets (1 or 2) used by the PI
  *
- * This static translation function is used by default if of_xlate in
- * :c:type:`pse_controller_dev` is not set. It is useful for all PSE
- * controllers with #pse-cells = <0>.
+ * Return: 0 on success and failure value on error
  */
-static int of_pse_zero_xlate(struct pse_controller_dev *pcdev,
-			     const struct of_phandle_args *pse_spec)
+static int of_load_pse_pi_pairsets(struct device_node *node,
+				   struct pse_pi *pi,
+				   int npairsets)
 {
-	return 0;
+	int i, ret;
+
+	ret = of_property_count_strings(node, "pairset-names");
+	if (ret != npairsets) {
+		pr_err("pse: amount of pairsets and pairset-names is not equal %d != %d (%pOF)\n",
+		       npairsets, ret, node);
+		return -EINVAL;
+	}
+
+	for (i = 0; i < npairsets; i++) {
+		ret = of_load_single_pse_pi_pairset(node, pi, i);
+		if (ret)
+			goto out;
+	}
+
+	if (npairsets == 2 &&
+	    pi->pairset[0].pinout == pi->pairset[1].pinout) {
+		pr_err("pse: two PI pairsets can not have identical pinout (%pOF)",
+		       node);
+		ret = -EINVAL;
+	}
+
+out:
+	/* If an error appears, release all the pairset device node kref */
+	if (ret) {
+		of_node_put(pi->pairset[0].np);
+		pi->pairset[0].np = NULL;
+		of_node_put(pi->pairset[1].np);
+		pi->pairset[1].np = NULL;
+	}
+
+	return ret;
+}
+
+static void pse_release_pis(struct pse_controller_dev *pcdev)
+{
+	int i;
+
+	for (i = 0; i <= pcdev->nr_lines; i++) {
+		of_node_put(pcdev->pi[i].pairset[0].np);
+		of_node_put(pcdev->pi[i].pairset[1].np);
+		of_node_put(pcdev->pi[i].np);
+	}
+	kfree(pcdev->pi);
 }
 
 /**
- * of_pse_simple_xlate - translate pse_spec to the PSE line number
+ * of_load_pse_pis - load all the PSE PIs
  * @pcdev: a pointer to the PSE controller device
- * @pse_spec: PSE line specifier as found in the device tree
  *
- * This static translation function is used by default if of_xlate in
- * :c:type:`pse_controller_dev` is not set. It is useful for all PSE
- * controllers with 1:1 mapping, where PSE lines can be indexed by number
- * without gaps.
+ * Return: 0 on success and failure value on error
  */
-static int of_pse_simple_xlate(struct pse_controller_dev *pcdev,
-			       const struct of_phandle_args *pse_spec)
+static int of_load_pse_pis(struct pse_controller_dev *pcdev)
 {
-	if (pse_spec->args[0] >= pcdev->nr_lines)
-		return -EINVAL;
+	struct device_node *np = pcdev->dev->of_node;
+	struct device_node *node, *pis;
+	int ret;
 
-	return pse_spec->args[0];
+	if (!np)
+		return -ENODEV;
+
+	pcdev->pi = kcalloc(pcdev->nr_lines, sizeof(*pcdev->pi), GFP_KERNEL);
+	if (!pcdev->pi)
+		return -ENOMEM;
+
+	pis = of_get_child_by_name(np, "pse-pis");
+	if (!pis) {
+		/* no description of PSE PIs */
+		pcdev->no_of_pse_pi = true;
+		return 0;
+	}
+
+	for_each_child_of_node(pis, node) {
+		struct pse_pi pi = {0};
+		u32 id;
+
+		if (!of_node_name_eq(node, "pse-pi"))
+			continue;
+
+		ret = of_property_read_u32(node, "reg", &id);
+		if (ret) {
+			dev_err(pcdev->dev,
+				"can't get reg property for node '%pOF'",
+				node);
+			goto out;
+		}
+
+		if (id >= pcdev->nr_lines) {
+			dev_err(pcdev->dev,
+				"reg value (%u) is out of range (%u) (%pOF)\n",
+				id, pcdev->nr_lines, node);
+			ret = -EINVAL;
+			goto out;
+		}
+
+		if (pcdev->pi[id].np) {
+			dev_err(pcdev->dev,
+				"other node with same reg value was already registered. %pOF : %pOF\n",
+				pcdev->pi[id].np, node);
+			ret = -EINVAL;
+			goto out;
+		}
+
+		ret = of_count_phandle_with_args(node, "pairsets", NULL);
+		/* npairsets is limited to value one or two */
+		if (ret == 1 || ret == 2) {
+			ret = of_load_pse_pi_pairsets(node, &pi, ret);
+			if (ret)
+				goto out;
+		} else if (ret != ENOENT) {
+			dev_err(pcdev->dev,
+				"error: wrong number of pairsets. Should be 1 or 2, got %d (%pOF)\n",
+				ret, node);
+			ret = -EINVAL;
+			goto out;
+		}
+
+		of_node_get(node);
+		pi.np = node;
+		memcpy(&pcdev->pi[id], &pi, sizeof(pi));
+	}
+
+	of_node_put(pis);
+	return 0;
+
+out:
+	pse_release_pis(pcdev);
+	of_node_put(node);
+	of_node_put(pis);
+	return ret;
+}
+
+static int pse_pi_is_enabled(struct regulator_dev *rdev)
+{
+	struct pse_controller_dev *pcdev = rdev_get_drvdata(rdev);
+	const struct pse_controller_ops *ops;
+	int id, ret;
+
+	ops = pcdev->ops;
+	if (!ops->pi_is_enabled)
+		return -EOPNOTSUPP;
+
+	id = rdev_get_id(rdev);
+	mutex_lock(&pcdev->lock);
+	ret = ops->pi_is_enabled(pcdev, id);
+	mutex_unlock(&pcdev->lock);
+
+	return ret;
+}
+
+static int pse_pi_enable(struct regulator_dev *rdev)
+{
+	struct pse_controller_dev *pcdev = rdev_get_drvdata(rdev);
+	const struct pse_controller_ops *ops;
+	int id, ret;
+
+	ops = pcdev->ops;
+	if (!ops->pi_enable)
+		return -EOPNOTSUPP;
+
+	id = rdev_get_id(rdev);
+	mutex_lock(&pcdev->lock);
+	ret = ops->pi_enable(pcdev, id);
+	if (!ret)
+		pcdev->pi[id].admin_state_enabled = 1;
+	mutex_unlock(&pcdev->lock);
+
+	return ret;
+}
+
+static int pse_pi_disable(struct regulator_dev *rdev)
+{
+	struct pse_controller_dev *pcdev = rdev_get_drvdata(rdev);
+	const struct pse_controller_ops *ops;
+	int id, ret;
+
+	ops = pcdev->ops;
+	if (!ops->pi_disable)
+		return -EOPNOTSUPP;
+
+	id = rdev_get_id(rdev);
+	mutex_lock(&pcdev->lock);
+	ret = ops->pi_disable(pcdev, id);
+	if (!ret)
+		pcdev->pi[id].admin_state_enabled = 0;
+	mutex_unlock(&pcdev->lock);
+
+	return ret;
+}
+
+static const struct regulator_ops pse_pi_ops = {
+	.is_enabled = pse_pi_is_enabled,
+	.enable = pse_pi_enable,
+	.disable = pse_pi_disable,
+};
+
+static int
+devm_pse_pi_regulator_register(struct pse_controller_dev *pcdev,
+			       char *name, int id)
+{
+	struct regulator_init_data *rinit_data;
+	struct regulator_config rconfig = {0};
+	struct regulator_desc *rdesc;
+	struct regulator_dev *rdev;
+
+	rinit_data = devm_kzalloc(pcdev->dev, sizeof(*rinit_data),
+				  GFP_KERNEL);
+	if (!rinit_data)
+		return -ENOMEM;
+
+	rdesc = devm_kzalloc(pcdev->dev, sizeof(*rdesc), GFP_KERNEL);
+	if (!rdesc)
+		return -ENOMEM;
+
+	/* Regulator descriptor id have to be the same as its associated
+	 * PSE PI id for the well functioning of the PSE controls.
+	 */
+	rdesc->id = id;
+	rdesc->name = name;
+	rdesc->type = REGULATOR_VOLTAGE;
+	rdesc->ops = &pse_pi_ops;
+	rdesc->owner = pcdev->owner;
+
+	rinit_data->constraints.valid_ops_mask = REGULATOR_CHANGE_STATUS;
+	rinit_data->supply_regulator = "vpwr";
+
+	rconfig.dev = pcdev->dev;
+	rconfig.driver_data = pcdev;
+	rconfig.init_data = rinit_data;
+
+	rdev = devm_regulator_register(pcdev->dev, rdesc, &rconfig);
+	if (IS_ERR(rdev)) {
+		dev_err_probe(pcdev->dev, PTR_ERR(rdev),
+			      "Failed to register regulator\n");
+		return PTR_ERR(rdev);
+	}
+
+	pcdev->pi[id].rdev = rdev;
+
+	return 0;
 }
 
 /**
  * pse_controller_register - register a PSE controller device
  * @pcdev: a pointer to the initialized PSE controller device
+ *
+ * Return: 0 on success and failure value on error
  */
 int pse_controller_register(struct pse_controller_dev *pcdev)
 {
-	if (!pcdev->of_xlate) {
-		if (pcdev->of_pse_n_cells == 0)
-			pcdev->of_xlate = of_pse_zero_xlate;
-		else if (pcdev->of_pse_n_cells == 1)
-			pcdev->of_xlate = of_pse_simple_xlate;
-	}
+	size_t reg_name_len;
+	int ret, i;
 
 	mutex_init(&pcdev->lock);
 	INIT_LIST_HEAD(&pcdev->pse_control_head);
 
+	if (!pcdev->nr_lines)
+		pcdev->nr_lines = 1;
+
+	ret = of_load_pse_pis(pcdev);
+	if (ret)
+		return ret;
+
+	if (pcdev->ops->setup_pi_matrix) {
+		ret = pcdev->ops->setup_pi_matrix(pcdev);
+		if (ret)
+			return ret;
+	}
+
+	/* Each regulator name len is pcdev dev name + 7 char +
+	 * int max digit number (10) + 1
+	 */
+	reg_name_len = strlen(dev_name(pcdev->dev)) + 18;
+
+	/* Register PI regulators */
+	for (i = 0; i < pcdev->nr_lines; i++) {
+		char *reg_name;
+
+		/* Do not register regulator for PIs not described */
+		if (!pcdev->no_of_pse_pi && !pcdev->pi[i].np)
+			continue;
+
+		reg_name = devm_kzalloc(pcdev->dev, reg_name_len, GFP_KERNEL);
+		if (!reg_name)
+			return -ENOMEM;
+
+		snprintf(reg_name, reg_name_len, "pse-%s_pi%d",
+			 dev_name(pcdev->dev), i);
+
+		ret = devm_pse_pi_regulator_register(pcdev, reg_name, i);
+		if (ret)
+			return ret;
+	}
+
 	mutex_lock(&pse_list_mutex);
 	list_add(&pcdev->list, &pse_controller_list);
 	mutex_unlock(&pse_list_mutex);
@@ -91,6 +383,7 @@ EXPORT_SYMBOL_GPL(pse_controller_register);
  */
 void pse_controller_unregister(struct pse_controller_dev *pcdev)
 {
+	pse_release_pis(pcdev);
 	mutex_lock(&pse_list_mutex);
 	list_del(&pcdev->list);
 	mutex_unlock(&pse_list_mutex);
@@ -110,6 +403,8 @@ static void devm_pse_controller_release(struct device *dev, void *res)
  * Managed pse_controller_register(). For PSE controllers registered by
  * this function, pse_controller_unregister() is automatically called on
  * driver detach. See pse_controller_register() for more information.
+ *
+ * Return: 0 on success and failure value on error
  */
 int devm_pse_controller_register(struct device *dev,
 				 struct pse_controller_dev *pcdev)
@@ -144,6 +439,10 @@ static void __pse_control_release(struct kref *kref)
 
 	lockdep_assert_held(&pse_list_mutex);
 
+	if (psec->pcdev->pi[psec->id].admin_state_enabled)
+		regulator_disable(psec->ps);
+	devm_regulator_put(psec->ps);
+
 	module_put(psec->pcdev->owner);
 
 	list_del(&psec->list);
@@ -176,6 +475,7 @@ static struct pse_control *
 pse_control_get_internal(struct pse_controller_dev *pcdev, unsigned int index)
 {
 	struct pse_control *psec;
+	int ret;
 
 	lockdep_assert_held(&pse_list_mutex);
 
@@ -191,20 +491,82 @@ pse_control_get_internal(struct pse_controller_dev *pcdev, unsigned int index)
 		return ERR_PTR(-ENOMEM);
 
 	if (!try_module_get(pcdev->owner)) {
-		kfree(psec);
-		return ERR_PTR(-ENODEV);
+		ret = -ENODEV;
+		goto free_psec;
 	}
 
+	psec->ps = devm_regulator_get_exclusive(pcdev->dev,
+						rdev_get_name(pcdev->pi[index].rdev));
+	if (IS_ERR(psec->ps)) {
+		ret = PTR_ERR(psec->ps);
+		goto put_module;
+	}
+
+	ret = regulator_is_enabled(psec->ps);
+	if (ret < 0)
+		goto regulator_put;
+
+	pcdev->pi[index].admin_state_enabled = ret;
+
 	psec->pcdev = pcdev;
 	list_add(&psec->list, &pcdev->pse_control_head);
 	psec->id = index;
 	kref_init(&psec->refcnt);
 
 	return psec;
+
+regulator_put:
+	devm_regulator_put(psec->ps);
+put_module:
+	module_put(pcdev->owner);
+free_psec:
+	kfree(psec);
+
+	return ERR_PTR(ret);
+}
+
+/**
+ * of_pse_match_pi - Find the PSE PI id matching the device node phandle
+ * @pcdev: a pointer to the PSE controller device
+ * @np: a pointer to the device node
+ *
+ * Return: id of the PSE PI, -EINVAL if not found
+ */
+static int of_pse_match_pi(struct pse_controller_dev *pcdev,
+			   struct device_node *np)
+{
+	int i;
+
+	for (i = 0; i <= pcdev->nr_lines; i++) {
+		if (pcdev->pi[i].np == np)
+			return i;
+	}
+
+	return -EINVAL;
+}
+
+/**
+ * psec_id_xlate - translate pse_spec to the PSE line number according
+ *		   to the number of pse-cells in case of no pse_pi node
+ * @pcdev: a pointer to the PSE controller device
+ * @pse_spec: PSE line specifier as found in the device tree
+ *
+ * Return: 0 if #pse-cells = <0>. Return PSE line number otherwise.
+ */
+static int psec_id_xlate(struct pse_controller_dev *pcdev,
+			 const struct of_phandle_args *pse_spec)
+{
+	if (!pcdev->of_pse_n_cells)
+		return 0;
+
+	if (pcdev->of_pse_n_cells > 1 ||
+	    pse_spec->args[0] >= pcdev->nr_lines)
+		return -EINVAL;
+
+	return pse_spec->args[0];
 }
 
-struct pse_control *
-of_pse_control_get(struct device_node *node)
+struct pse_control *of_pse_control_get(struct device_node *node)
 {
 	struct pse_controller_dev *r, *pcdev;
 	struct of_phandle_args args;
@@ -222,7 +584,14 @@ of_pse_control_get(struct device_node *node)
 	mutex_lock(&pse_list_mutex);
 	pcdev = NULL;
 	list_for_each_entry(r, &pse_controller_list, list) {
-		if (args.np == r->dev->of_node) {
+		if (!r->no_of_pse_pi) {
+			ret = of_pse_match_pi(r, args.np);
+			if (ret >= 0) {
+				pcdev = r;
+				psec_id = ret;
+				break;
+			}
+		} else if (args.np == r->dev->of_node) {
 			pcdev = r;
 			break;
 		}
@@ -238,10 +607,12 @@ of_pse_control_get(struct device_node *node)
 		goto out;
 	}
 
-	psec_id = pcdev->of_xlate(pcdev, &args);
-	if (psec_id < 0) {
-		psec = ERR_PTR(psec_id);
-		goto out;
+	if (pcdev->no_of_pse_pi) {
+		psec_id = psec_id_xlate(pcdev, &args);
+		if (psec_id < 0) {
+			psec = ERR_PTR(psec_id);
+			goto out;
+		}
 	}
 
 	/* pse_list_mutex also protects the pcdev's pse_control list */
@@ -260,6 +631,8 @@ EXPORT_SYMBOL_GPL(of_pse_control_get);
  * @psec: PSE control pointer
  * @extack: extack for reporting useful error messages
  * @status: struct to store PSE status
+ *
+ * Return: 0 on success and failure value on error
  */
 int pse_ethtool_get_status(struct pse_control *psec,
 			   struct netlink_ext_ack *extack,
@@ -284,31 +657,89 @@ int pse_ethtool_get_status(struct pse_control *psec,
 }
 EXPORT_SYMBOL_GPL(pse_ethtool_get_status);
 
+static int pse_ethtool_c33_set_config(struct pse_control *psec,
+				      const struct pse_control_config *config)
+{
+	int err = 0;
+
+	/* Look at admin_state_enabled status to not call regulator_enable
+	 * or regulator_disable twice creating a regulator counter mismatch
+	 */
+	switch (config->c33_admin_control) {
+	case ETHTOOL_C33_PSE_ADMIN_STATE_ENABLED:
+		if (!psec->pcdev->pi[psec->id].admin_state_enabled)
+			err = regulator_enable(psec->ps);
+		break;
+	case ETHTOOL_C33_PSE_ADMIN_STATE_DISABLED:
+		if (psec->pcdev->pi[psec->id].admin_state_enabled)
+			err = regulator_disable(psec->ps);
+		break;
+	default:
+		err = -EOPNOTSUPP;
+	}
+
+	return err;
+}
+
+static int pse_ethtool_podl_set_config(struct pse_control *psec,
+				       const struct pse_control_config *config)
+{
+	int err = 0;
+
+	/* Look at admin_state_enabled status to not call regulator_enable
+	 * or regulator_disable twice creating a regulator counter mismatch
+	 */
+	switch (config->podl_admin_control) {
+	case ETHTOOL_PODL_PSE_ADMIN_STATE_ENABLED:
+		if (!psec->pcdev->pi[psec->id].admin_state_enabled)
+			err = regulator_enable(psec->ps);
+		break;
+	case ETHTOOL_PODL_PSE_ADMIN_STATE_DISABLED:
+		if (psec->pcdev->pi[psec->id].admin_state_enabled)
+			err = regulator_disable(psec->ps);
+		break;
+	default:
+		err = -EOPNOTSUPP;
+	}
+
+	return err;
+}
+
 /**
  * pse_ethtool_set_config - set PSE control configuration
  * @psec: PSE control pointer
  * @extack: extack for reporting useful error messages
  * @config: Configuration of the test to run
+ *
+ * Return: 0 on success and failure value on error
  */
 int pse_ethtool_set_config(struct pse_control *psec,
 			   struct netlink_ext_ack *extack,
 			   const struct pse_control_config *config)
 {
-	const struct pse_controller_ops *ops;
-	int err;
-
-	ops = psec->pcdev->ops;
+	int err = 0;
 
-	if (!ops->ethtool_set_config) {
-		NL_SET_ERR_MSG(extack,
-			       "PSE driver does not configuration");
-		return -EOPNOTSUPP;
+	if (pse_has_c33(psec)) {
+		err = pse_ethtool_c33_set_config(psec, config);
+		if (err)
+			return err;
 	}
 
-	mutex_lock(&psec->pcdev->lock);
-	err = ops->ethtool_set_config(psec->pcdev, psec->id, extack, config);
-	mutex_unlock(&psec->pcdev->lock);
+	if (pse_has_podl(psec))
+		err = pse_ethtool_podl_set_config(psec, config);
 
 	return err;
 }
 EXPORT_SYMBOL_GPL(pse_ethtool_set_config);
+
+bool pse_has_podl(struct pse_control *psec)
+{
+	return psec->pcdev->types & ETHTOOL_PSE_PODL;
+}
+EXPORT_SYMBOL_GPL(pse_has_podl);
+
+bool pse_has_c33(struct pse_control *psec)
+{
+	return psec->pcdev->types & ETHTOOL_PSE_C33;
+}
+EXPORT_SYMBOL_GPL(pse_has_c33);