summaryrefslogtreecommitdiffstats
path: root/drivers/phy
diff options
context:
space:
mode:
authorLucas Stach <dev@lynxeye.de>2014-11-02 21:13:53 +0100
committerSascha Hauer <s.hauer@pengutronix.de>2014-11-04 09:50:44 +0100
commit9d1fbc5d12824f882a477f331966517dbc2db5b2 (patch)
treeaebd6191a0efa3ea2e66b5edede5ae3cb07cbe4c /drivers/phy
parente000cbeb7a8340f6fe3204db4555790697815ce8 (diff)
downloadbarebox-9d1fbc5d12824f882a477f331966517dbc2db5b2.tar.gz
add generic PHY framework
This brings in the generix PHY framework from Linux. I tried to strip it down as much as possible while keeping it useful. Signed-off-by: Lucas Stach <dev@lynxeye.de> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'drivers/phy')
-rw-r--r--drivers/phy/Kconfig18
-rw-r--r--drivers/phy/Makefile5
-rw-r--r--drivers/phy/phy-core.c318
3 files changed, 341 insertions, 0 deletions
diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
new file mode 100644
index 0000000..e9461e1
--- /dev/null
+++ b/drivers/phy/Kconfig
@@ -0,0 +1,18 @@
+#
+# PHY
+#
+
+menu "PHY Subsystem"
+
+config GENERIC_PHY
+ bool "PHY Core"
+ help
+ Generic PHY support.
+
+ This framework is designed to provide a generic interface for PHY
+ devices present in the kernel. This layer will have the generic
+ API by which phy drivers can create PHY using the phy framework and
+ phy users can obtain reference to the PHY. All the users of this
+ framework should select this config.
+
+endmenu
diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
new file mode 100644
index 0000000..74514ae
--- /dev/null
+++ b/drivers/phy/Makefile
@@ -0,0 +1,5 @@
+#
+# Makefile for the phy drivers.
+#
+
+obj-$(CONFIG_GENERIC_PHY) += phy-core.o
diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c
new file mode 100644
index 0000000..67af14f
--- /dev/null
+++ b/drivers/phy/phy-core.c
@@ -0,0 +1,318 @@
+/*
+ * phy-core.c -- Generic Phy framework.
+ *
+ * Copyright (C) 2014 Lucas Stach <l.stach@pengutronix.de>
+ * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com
+ *
+ * Author: Kishon Vijay Abraham I <kishon@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ */
+
+#include <common.h>
+#include <malloc.h>
+#include <linux/phy/phy.h>
+
+static LIST_HEAD(phy_provider_list);
+static int phy_ida;
+
+/**
+ * phy_create() - create a new phy
+ * @dev: device that is creating the new phy
+ * @node: device node of the phy
+ * @ops: function pointers for performing phy operations
+ * @init_data: contains the list of PHY consumers or NULL
+ *
+ * Called to create a phy using phy framework.
+ */
+struct phy *phy_create(struct device_d *dev, struct device_node *node,
+ const struct phy_ops *ops,
+ struct phy_init_data *init_data)
+{
+ int ret;
+ int id;
+ struct phy *phy;
+
+ if (WARN_ON(!dev))
+ return ERR_PTR(-EINVAL);
+
+ phy = kzalloc(sizeof(*phy), GFP_KERNEL);
+ if (!phy)
+ return ERR_PTR(-ENOMEM);
+
+ id = phy_ida++;
+
+ snprintf(phy->dev.name, MAX_DRIVER_NAME, "phy");
+ phy->dev.id = id;
+ phy->dev.parent = dev;
+ phy->dev.device_node = node ?: dev->device_node;
+ phy->id = id;
+ phy->ops = ops;
+ phy->init_data = init_data;
+
+ ret = register_device(&phy->dev);
+ if (ret)
+ goto free_ida;
+
+ return phy;
+
+free_ida:
+ phy_ida--;
+ kfree(phy);
+ return ERR_PTR(ret);
+}
+
+/**
+ * __of_phy_provider_register() - create/register phy provider with the framework
+ * @dev: struct device of the phy provider
+ * @owner: the module owner containing of_xlate
+ * @of_xlate: function pointer to obtain phy instance from phy provider
+ *
+ * Creates struct phy_provider from dev and of_xlate function pointer.
+ * This is used in the case of dt boot for finding the phy instance from
+ * phy provider.
+ */
+struct phy_provider *__of_phy_provider_register(struct device_d *dev,
+ struct phy * (*of_xlate)(struct device_d *dev,
+ struct of_phandle_args *args))
+{
+ struct phy_provider *phy_provider;
+
+ phy_provider = kzalloc(sizeof(*phy_provider), GFP_KERNEL);
+ if (!phy_provider)
+ return ERR_PTR(-ENOMEM);
+
+ phy_provider->dev = dev;
+ phy_provider->of_xlate = of_xlate;
+
+ list_add_tail(&phy_provider->list, &phy_provider_list);
+
+ return phy_provider;
+}
+
+/**
+ * of_phy_provider_unregister() - unregister phy provider from the framework
+ * @phy_provider: phy provider returned by of_phy_provider_register()
+ *
+ * Removes the phy_provider created using of_phy_provider_register().
+ */
+void of_phy_provider_unregister(struct phy_provider *phy_provider)
+{
+ if (IS_ERR(phy_provider))
+ return;
+
+ list_del(&phy_provider->list);
+ kfree(phy_provider);
+}
+
+int phy_init(struct phy *phy)
+{
+ int ret;
+
+ if (!phy)
+ return 0;
+
+ if (phy->init_count == 0 && phy->ops->init) {
+ ret = phy->ops->init(phy);
+ if (ret < 0) {
+ dev_err(&phy->dev, "phy init failed --> %d\n", ret);
+ return ret;
+ }
+ }
+ ++phy->init_count;
+
+ return 0;
+}
+
+int phy_exit(struct phy *phy)
+{
+ int ret;
+
+ if (!phy)
+ return 0;
+
+ if (phy->init_count == 1 && phy->ops->exit) {
+ ret = phy->ops->exit(phy);
+ if (ret < 0) {
+ dev_err(&phy->dev, "phy exit failed --> %d\n", ret);
+ return ret;
+ }
+ }
+ --phy->init_count;
+
+ return 0;
+}
+
+int phy_power_on(struct phy *phy)
+{
+ int ret;
+
+ if (!phy)
+ return 0;
+
+ if (phy->pwr) {
+ ret = regulator_enable(phy->pwr);
+ if (ret)
+ return ret;
+ }
+
+ if (phy->power_count == 0 && phy->ops->power_on) {
+ ret = phy->ops->power_on(phy);
+ if (ret < 0) {
+ dev_err(&phy->dev, "phy poweron failed --> %d\n", ret);
+ goto out;
+ }
+ } else {
+ ret = 0; /* Override possible ret == -ENOTSUPP */
+ }
+ ++phy->power_count;
+
+ return 0;
+
+out:
+ if (phy->pwr)
+ regulator_disable(phy->pwr);
+
+ return ret;
+}
+
+int phy_power_off(struct phy *phy)
+{
+ int ret;
+
+ if (!phy)
+ return 0;
+
+ if (phy->power_count == 1 && phy->ops->power_off) {
+ ret = phy->ops->power_off(phy);
+ if (ret < 0) {
+ dev_err(&phy->dev, "phy poweroff failed --> %d\n", ret);
+ return ret;
+ }
+ }
+ --phy->power_count;
+
+ if (phy->pwr)
+ regulator_disable(phy->pwr);
+
+ return 0;
+}
+
+static struct phy_provider *of_phy_provider_lookup(struct device_node *node)
+{
+ struct phy_provider *phy_provider;
+ struct device_node *child;
+
+ list_for_each_entry(phy_provider, &phy_provider_list, list) {
+ if (phy_provider->dev->device_node == node)
+ return phy_provider;
+
+ for_each_child_of_node(phy_provider->dev->device_node, child)
+ if (child == node)
+ return phy_provider;
+ }
+
+ return ERR_PTR(-ENODEV);
+}
+
+/**
+ * _of_phy_get() - lookup and obtain a reference to a phy by phandle
+ * @np: device_node for which to get the phy
+ * @index: the index of the phy
+ *
+ * Returns the phy associated with the given phandle value,
+ * after getting a refcount to it or -ENODEV if there is no such phy or
+ * -EPROBE_DEFER if there is a phandle to the phy, but the device is
+ * not yet loaded. This function uses of_xlate call back function provided
+ * while registering the phy_provider to find the phy instance.
+ */
+static struct phy *_of_phy_get(struct device_node *np, int index)
+{
+ int ret;
+ struct phy_provider *phy_provider;
+ struct of_phandle_args args;
+
+ ret = of_parse_phandle_with_args(np, "phys", "#phy-cells",
+ index, &args);
+ if (ret)
+ return ERR_PTR(-ENODEV);
+
+ phy_provider = of_phy_provider_lookup(args.np);
+ if (IS_ERR(phy_provider)) {
+ return ERR_PTR(-ENODEV);
+ }
+
+ return phy_provider->of_xlate(phy_provider->dev, &args);
+}
+
+/**
+ * of_phy_get() - lookup and obtain a reference to a phy using a device_node.
+ * @np: device_node for which to get the phy
+ * @con_id: name of the phy from device's point of view
+ *
+ * Returns the phy driver, after getting a refcount to it; or
+ * -ENODEV if there is no such phy. The caller is responsible for
+ * calling phy_put() to release that count.
+ */
+struct phy *of_phy_get(struct device_node *np, const char *con_id)
+{
+ int index = 0;
+
+ if (con_id)
+ index = of_property_match_string(np, "phy-names", con_id);
+
+ return _of_phy_get(np, index);
+}
+
+/**
+ * phy_get() - lookup and obtain a reference to a phy.
+ * @dev: device that requests this phy
+ * @string: the phy name as given in the dt data or the name of the controller
+ * port for non-dt case
+ *
+ * Returns the phy driver, after getting a refcount to it; or
+ * -ENODEV if there is no such phy. The caller is responsible for
+ * calling phy_put() to release that count.
+ */
+struct phy *phy_get(struct device_d *dev, const char *string)
+{
+ int index = 0;
+ struct phy *phy = ERR_PTR(-ENODEV);
+
+ if (string == NULL) {
+ dev_warn(dev, "missing string\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ if (dev->device_node) {
+ index = of_property_match_string(dev->device_node, "phy-names",
+ string);
+ phy = _of_phy_get(dev->device_node, index);
+ }
+
+ return phy;
+}
+
+/**
+ * phy_optional_get() - lookup and obtain a reference to an optional phy.
+ * @dev: device that requests this phy
+ * @string: the phy name as given in the dt data or the name of the controller
+ * port for non-dt case
+ *
+ * Returns the phy driver, after getting a refcount to it; or
+ * NULL if there is no such phy. The caller is responsible for
+ * calling phy_put() to release that count.
+ */
+struct phy *phy_optional_get(struct device_d *dev, const char *string)
+{
+ struct phy *phy = phy_get(dev, string);
+
+ if (PTR_ERR(phy) == -ENODEV)
+ phy = NULL;
+
+ return phy;
+}
+