1 files changed, 323 insertions, 0 deletions
diff --git a/net/mdio-uclass.c b/net/mdio-uclass.c
new file mode 100644
index 00000000000..4f052ae432c
--- /dev/null
+++ b/net/mdio-uclass.c
@@ -0,0 +1,323 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2019
+ * Alex Marginean, NXP
+ */
+
+#include <dm.h>
+#include <dm/lists.h>
+#include <eth_phy.h>
+#include <log.h>
+#include <malloc.h>
+#include <miiphy.h>
+#include <dm/device-internal.h>
+#include <dm/device_compat.h>
+#include <dm/of_extra.h>
+#include <dm/uclass-internal.h>
+#include <linux/compat.h>
+#include <linux/delay.h>
+
+#define DEFAULT_GPIO_RESET_DELAY	10	/* in microseconds */
+
+void dm_mdio_probe_devices(void)
+{
+	struct udevice *it;
+	struct uclass *uc;
+
+	uclass_get(UCLASS_MDIO, &uc);
+	uclass_foreach_dev(it, uc) {
+		device_probe(it);
+	}
+}
+
+static int dm_mdio_post_bind(struct udevice *dev)
+{
+	const char *dt_name;
+
+	/* set a custom name for the MDIO device, if present in DT */
+	if (dev_has_ofnode(dev)) {
+		dt_name = dev_read_string(dev, "device-name");
+		if (dt_name) {
+			debug("renaming dev %s to %s\n", dev->name, dt_name);
+			device_set_name(dev, dt_name);
+		}
+	}
+
+	/*
+	 * MDIO command doesn't like spaces in names, don't allow them to keep
+	 * it happy
+	 */
+	if (strchr(dev->name, ' ')) {
+		debug("\nError: MDIO device name \"%s\" has a space!\n",
+		      dev->name);
+		return -EINVAL;
+	}
+
+#if CONFIG_IS_ENABLED(OF_REAL)
+	return dm_scan_fdt_dev(dev);
+#else
+	return 0;
+#endif
+}
+
+int dm_mdio_read(struct udevice *mdio_dev, int addr, int devad, int reg)
+{
+	struct mdio_ops *ops = mdio_get_ops(mdio_dev);
+
+	if (!ops->read)
+		return -ENOSYS;
+
+	return ops->read(mdio_dev, addr, devad, reg);
+}
+
+int dm_mdio_write(struct udevice *mdio_dev, int addr, int devad, int reg,
+		  u16 val)
+{
+	struct mdio_ops *ops = mdio_get_ops(mdio_dev);
+
+	if (!ops->write)
+		return -ENOSYS;
+
+	return ops->write(mdio_dev, addr, devad, reg, val);
+}
+
+int dm_mdio_reset(struct udevice *mdio_dev)
+{
+	struct mdio_ops *ops = mdio_get_ops(mdio_dev);
+	struct mdio_perdev_priv *pdata = dev_get_uclass_priv(mdio_dev);
+	struct mii_dev *mii_bus = pdata->mii_bus;
+
+	if (CONFIG_IS_ENABLED(DM_GPIO) && dm_gpio_is_valid(&mii_bus->reset_gpiod)) {
+		dm_gpio_set_value(&mii_bus->reset_gpiod, 1);
+		udelay(mii_bus->reset_delay_us);
+		dm_gpio_set_value(&mii_bus->reset_gpiod, 0);
+		if (mii_bus->reset_post_delay_us > 0)
+			udelay(mii_bus->reset_post_delay_us);
+	}
+
+	if (!ops->reset)
+		return 0;
+
+	return ops->reset(mdio_dev);
+}
+
+/*
+ * Following read/write/reset functions are registered with legacy MII code.
+ * These are called for PHY operations by upper layers and we further call the
+ * DM MDIO driver functions.
+ */
+static int mdio_read(struct mii_dev *mii_bus, int addr, int devad, int reg)
+{
+	return dm_mdio_read(mii_bus->priv, addr, devad, reg);
+}
+
+static int mdio_write(struct mii_dev *mii_bus, int addr, int devad, int reg,
+		      u16 val)
+{
+	return dm_mdio_write(mii_bus->priv, addr, devad, reg, val);
+}
+
+static int mdio_reset(struct mii_dev *mii_bus)
+{
+	return dm_mdio_reset(mii_bus->priv);
+}
+
+static int mdio_bind_phy_nodes(struct udevice *mdio_dev)
+{
+	ofnode mdio_node, phy_node;
+	struct udevice *phy_dev;
+	const char *node_name;
+	int ret;
+
+	mdio_node = dev_ofnode(mdio_dev);
+	if (!ofnode_valid(mdio_node)) {
+		dev_dbg(mdio_dev, "invalid ofnode for mdio_dev\n");
+		return -ENXIO;
+	}
+
+	ofnode_for_each_subnode(phy_node, mdio_node) {
+		node_name = ofnode_get_name(phy_node);
+		dev_dbg(mdio_dev, "* Found child node: '%s'\n", node_name);
+		ret = device_bind_driver_to_node(mdio_dev,
+						 "eth_phy_generic_drv",
+						 node_name, phy_node, &phy_dev);
+		if (ret) {
+			dev_dbg(mdio_dev, "  - Eth phy binding error: %d\n", ret);
+			continue;
+		}
+
+		dev_dbg(mdio_dev, "  - bound phy device: '%s'\n", node_name);
+		ret = device_probe(phy_dev);
+		if (ret) {
+			dev_dbg(mdio_dev, "Device '%s' probe failed\n", phy_dev->name);
+			device_unbind(phy_dev);
+			continue;
+		}
+	}
+
+	return 0;
+}
+
+static int dm_mdio_post_probe(struct udevice *dev)
+{
+	struct mdio_perdev_priv *pdata = dev_get_uclass_priv(dev);
+	struct mii_dev *mii_bus;
+	int ret;
+
+	mii_bus = mdio_alloc();
+	if (!mii_bus) {
+		dev_err(dev, "couldn't allocate mii_bus\n");
+		return -ENOMEM;
+	}
+	pdata->mii_bus = mii_bus;
+	pdata->mii_bus->read = mdio_read;
+	pdata->mii_bus->write = mdio_write;
+	pdata->mii_bus->reset = mdio_reset;
+	pdata->mii_bus->priv = dev;
+	strlcpy(pdata->mii_bus->name, dev->name, MDIO_NAME_LEN);
+
+	if (IS_ENABLED(CONFIG_DM_GPIO)) {
+		/* Get bus level PHY reset GPIO details */
+		mii_bus->reset_delay_us = dev_read_u32_default(dev, "reset-delay-us",
+							       DEFAULT_GPIO_RESET_DELAY);
+		mii_bus->reset_post_delay_us = dev_read_u32_default(dev,
+								    "reset-post-delay-us",
+								    0);
+		ret = gpio_request_by_name(dev, "reset-gpios", 0, &mii_bus->reset_gpiod,
+					   GPIOD_IS_OUT | GPIOD_IS_OUT_ACTIVE);
+		if (ret && ret != -ENOENT) {
+			dev_err(dev, "couldn't get reset-gpios: %d\n", ret);
+			return ret;
+		}
+	}
+
+	if (CONFIG_IS_ENABLED(DM_ETH_PHY))
+		mdio_bind_phy_nodes(dev);
+
+	return mdio_register(pdata->mii_bus);
+}
+
+static int dm_mdio_pre_remove(struct udevice *dev)
+{
+	struct mdio_perdev_priv *pdata = dev_get_uclass_priv(dev);
+
+	dm_mdio_reset(dev);
+	mdio_unregister(pdata->mii_bus);
+	mdio_free(pdata->mii_bus);
+
+	return 0;
+}
+
+struct phy_device *dm_phy_find_by_ofnode(ofnode phynode)
+{
+	struct mdio_perdev_priv *pdata;
+	struct udevice *mdiodev;
+	u32 phy_addr;
+
+	if (ofnode_read_u32(phynode, "reg", &phy_addr))
+		return NULL;
+
+	if (uclass_get_device_by_ofnode(UCLASS_MDIO,
+					ofnode_get_parent(phynode),
+					&mdiodev))
+		return NULL;
+
+	if (device_probe(mdiodev))
+		return NULL;
+
+	pdata = dev_get_uclass_priv(mdiodev);
+
+	return phy_find_by_mask(pdata->mii_bus, BIT(phy_addr));
+}
+
+struct phy_device *dm_mdio_phy_connect(struct udevice *mdiodev, int phyaddr,
+				       struct udevice *ethdev,
+				       phy_interface_t interface)
+{
+	struct mdio_perdev_priv *pdata = dev_get_uclass_priv(mdiodev);
+
+	if (device_probe(mdiodev))
+		return NULL;
+
+	return phy_connect(pdata->mii_bus, phyaddr, ethdev, interface);
+}
+
+static struct phy_device *dm_eth_connect_phy_handle(struct udevice *ethdev,
+						    phy_interface_t interface)
+{
+	u32 phy_addr;
+	struct udevice *mdiodev;
+	struct phy_device *phy;
+	ofnode phynode;
+
+	if (IS_ENABLED(CONFIG_PHY_FIXED) &&
+	    ofnode_phy_is_fixed_link(dev_ofnode(ethdev), &phynode)) {
+		phy = phy_connect(NULL, 0, ethdev, interface);
+		goto out;
+	}
+
+	phynode = dev_get_phy_node(ethdev);
+	if (!ofnode_valid(phynode)) {
+		dev_dbg(ethdev, "can't find PHY node\n");
+		return NULL;
+	}
+
+	/*
+	 * reading 'reg' directly should be fine.  This is a PHY node, the
+	 * address is always size 1 and requires no translation
+	 */
+	if (ofnode_read_u32(phynode, "reg", &phy_addr)) {
+		dev_dbg(ethdev, "missing reg property in phy node\n");
+		return NULL;
+	}
+
+	if (uclass_get_device_by_ofnode(UCLASS_MDIO,
+					ofnode_get_parent(phynode),
+					&mdiodev)) {
+		dev_dbg(ethdev, "can't find MDIO bus for node %s\n",
+			ofnode_get_name(ofnode_get_parent(phynode)));
+		return NULL;
+	}
+
+	phy = dm_mdio_phy_connect(mdiodev, phy_addr, ethdev, interface);
+
+out:
+	if (phy)
+		phy->node = phynode;
+
+	return phy;
+}
+
+/* Connect to a PHY linked in eth DT node */
+struct phy_device *dm_eth_phy_connect(struct udevice *ethdev)
+{
+	phy_interface_t interface;
+	struct phy_device *phy;
+
+	if (!dev_has_ofnode(ethdev)) {
+		debug("%s: supplied eth dev has no DT node!\n", ethdev->name);
+		return NULL;
+	}
+
+	interface = dev_read_phy_mode(ethdev);
+	if (interface == PHY_INTERFACE_MODE_NA)
+		dev_dbg(ethdev, "can't find interface mode, default to NA\n");
+
+	phy = dm_eth_connect_phy_handle(ethdev, interface);
+
+	if (!phy)
+		return NULL;
+
+	phy->interface = interface;
+
+	return phy;
+}
+
+UCLASS_DRIVER(mdio) = {
+	.id = UCLASS_MDIO,
+	.name = "mdio",
+	.post_bind  = dm_mdio_post_bind,
+	.post_probe = dm_mdio_post_probe,
+	.pre_remove = dm_mdio_pre_remove,
+	.per_device_auto	= sizeof(struct mdio_perdev_priv),
+};