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net: introduce MDIO DM class for MDIO devices
Adds UCLASS_MDIO DM class supporting MDIO buses that are probed as stand-alone devices. Useful in particular for systems that support DM_ETH and have a stand-alone MDIO hardware block shared by multiple Ethernet interfaces. Signed-off-by: Alex Marginean <[email protected]> Reviewed-by: Bin Meng <[email protected]> Acked-by: Joe Hershberger <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,115 @@ | ||
| // SPDX-License-Identifier: GPL-2.0+ | ||
| /* | ||
| * (C) Copyright 2019 | ||
| * Alex Marginean, NXP | ||
| */ | ||
|
|
||
| #include <common.h> | ||
| #include <dm.h> | ||
| #include <miiphy.h> | ||
| #include <dm/device-internal.h> | ||
| #include <dm/uclass-internal.h> | ||
|
|
||
| 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) | ||
| { | ||
| /* | ||
| * 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; | ||
| } | ||
|
|
||
| return 0; | ||
| } | ||
|
|
||
| /* | ||
| * 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) | ||
| { | ||
| struct udevice *dev = mii_bus->priv; | ||
|
|
||
| return mdio_get_ops(dev)->read(dev, addr, devad, reg); | ||
| } | ||
|
|
||
| static int mdio_write(struct mii_dev *mii_bus, int addr, int devad, int reg, | ||
| u16 val) | ||
| { | ||
| struct udevice *dev = mii_bus->priv; | ||
|
|
||
| return mdio_get_ops(dev)->write(dev, addr, devad, reg, val); | ||
| } | ||
|
|
||
| static int mdio_reset(struct mii_dev *mii_bus) | ||
| { | ||
| struct udevice *dev = mii_bus->priv; | ||
|
|
||
| if (mdio_get_ops(dev)->reset) | ||
| return mdio_get_ops(dev)->reset(dev); | ||
| else | ||
| return 0; | ||
| } | ||
|
|
||
| static int dm_mdio_post_probe(struct udevice *dev) | ||
| { | ||
| struct mdio_perdev_priv *pdata = dev_get_uclass_priv(dev); | ||
|
|
||
| pdata->mii_bus = mdio_alloc(); | ||
| pdata->mii_bus->read = mdio_read; | ||
| pdata->mii_bus->write = mdio_write; | ||
| pdata->mii_bus->reset = mdio_reset; | ||
| pdata->mii_bus->priv = dev; | ||
| strncpy(pdata->mii_bus->name, dev->name, MDIO_NAME_LEN); | ||
|
|
||
| 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); | ||
| struct mdio_ops *ops = mdio_get_ops(dev); | ||
|
|
||
| if (ops->reset) | ||
| ops->reset(dev); | ||
| mdio_unregister(pdata->mii_bus); | ||
| mdio_free(pdata->mii_bus); | ||
|
|
||
| return 0; | ||
| } | ||
|
|
||
| struct phy_device *dm_mdio_phy_connect(struct udevice *dev, int addr, | ||
| struct udevice *ethdev, | ||
| phy_interface_t interface) | ||
| { | ||
| struct mdio_perdev_priv *pdata = dev_get_uclass_priv(dev); | ||
|
|
||
| if (device_probe(dev)) | ||
| return 0; | ||
|
|
||
| return phy_connect(pdata->mii_bus, addr, ethdev, interface); | ||
| } | ||
|
|
||
| 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_alloc_size = sizeof(struct mdio_perdev_priv), | ||
| }; |