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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/net/phy/fixed_phy.c | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/net/phy/fixed_phy.c')
-rw-r--r-- | drivers/net/phy/fixed_phy.c | 391 |
1 files changed, 391 insertions, 0 deletions
diff --git a/drivers/net/phy/fixed_phy.c b/drivers/net/phy/fixed_phy.c new file mode 100644 index 0000000000..aef739c20a --- /dev/null +++ b/drivers/net/phy/fixed_phy.c @@ -0,0 +1,391 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Fixed MDIO bus (MDIO bus emulation with fixed PHYs) + * + * Author: Vitaly Bordug <vbordug@ru.mvista.com> + * Anton Vorontsov <avorontsov@ru.mvista.com> + * + * Copyright (c) 2006-2007 MontaVista Software, Inc. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/list.h> +#include <linux/mii.h> +#include <linux/phy.h> +#include <linux/phy_fixed.h> +#include <linux/err.h> +#include <linux/slab.h> +#include <linux/of.h> +#include <linux/gpio/consumer.h> +#include <linux/idr.h> +#include <linux/netdevice.h> +#include <linux/linkmode.h> + +#include "swphy.h" + +struct fixed_mdio_bus { + struct mii_bus *mii_bus; + struct list_head phys; +}; + +struct fixed_phy { + int addr; + struct phy_device *phydev; + struct fixed_phy_status status; + bool no_carrier; + int (*link_update)(struct net_device *, struct fixed_phy_status *); + struct list_head node; + struct gpio_desc *link_gpiod; +}; + +static struct platform_device *pdev; +static struct fixed_mdio_bus platform_fmb = { + .phys = LIST_HEAD_INIT(platform_fmb.phys), +}; + +int fixed_phy_change_carrier(struct net_device *dev, bool new_carrier) +{ + struct fixed_mdio_bus *fmb = &platform_fmb; + struct phy_device *phydev = dev->phydev; + struct fixed_phy *fp; + + if (!phydev || !phydev->mdio.bus) + return -EINVAL; + + list_for_each_entry(fp, &fmb->phys, node) { + if (fp->addr == phydev->mdio.addr) { + fp->no_carrier = !new_carrier; + return 0; + } + } + return -EINVAL; +} +EXPORT_SYMBOL_GPL(fixed_phy_change_carrier); + +static void fixed_phy_update(struct fixed_phy *fp) +{ + if (!fp->no_carrier && fp->link_gpiod) + fp->status.link = !!gpiod_get_value_cansleep(fp->link_gpiod); +} + +static int fixed_mdio_read(struct mii_bus *bus, int phy_addr, int reg_num) +{ + struct fixed_mdio_bus *fmb = bus->priv; + struct fixed_phy *fp; + + list_for_each_entry(fp, &fmb->phys, node) { + if (fp->addr == phy_addr) { + struct fixed_phy_status state; + + fp->status.link = !fp->no_carrier; + + /* Issue callback if user registered it. */ + if (fp->link_update) + fp->link_update(fp->phydev->attached_dev, + &fp->status); + + /* Check the GPIO for change in status */ + fixed_phy_update(fp); + state = fp->status; + + return swphy_read_reg(reg_num, &state); + } + } + + return 0xFFFF; +} + +static int fixed_mdio_write(struct mii_bus *bus, int phy_addr, int reg_num, + u16 val) +{ + return 0; +} + +/* + * If something weird is required to be done with link/speed, + * network driver is able to assign a function to implement this. + * May be useful for PHY's that need to be software-driven. + */ +int fixed_phy_set_link_update(struct phy_device *phydev, + int (*link_update)(struct net_device *, + struct fixed_phy_status *)) +{ + struct fixed_mdio_bus *fmb = &platform_fmb; + struct fixed_phy *fp; + + if (!phydev || !phydev->mdio.bus) + return -EINVAL; + + list_for_each_entry(fp, &fmb->phys, node) { + if (fp->addr == phydev->mdio.addr) { + fp->link_update = link_update; + fp->phydev = phydev; + return 0; + } + } + + return -ENOENT; +} +EXPORT_SYMBOL_GPL(fixed_phy_set_link_update); + +static int fixed_phy_add_gpiod(unsigned int irq, int phy_addr, + struct fixed_phy_status *status, + struct gpio_desc *gpiod) +{ + int ret; + struct fixed_mdio_bus *fmb = &platform_fmb; + struct fixed_phy *fp; + + ret = swphy_validate_state(status); + if (ret < 0) + return ret; + + fp = kzalloc(sizeof(*fp), GFP_KERNEL); + if (!fp) + return -ENOMEM; + + if (irq != PHY_POLL) + fmb->mii_bus->irq[phy_addr] = irq; + + fp->addr = phy_addr; + fp->status = *status; + fp->link_gpiod = gpiod; + + fixed_phy_update(fp); + + list_add_tail(&fp->node, &fmb->phys); + + return 0; +} + +int fixed_phy_add(unsigned int irq, int phy_addr, + struct fixed_phy_status *status) +{ + return fixed_phy_add_gpiod(irq, phy_addr, status, NULL); +} +EXPORT_SYMBOL_GPL(fixed_phy_add); + +static DEFINE_IDA(phy_fixed_ida); + +static void fixed_phy_del(int phy_addr) +{ + struct fixed_mdio_bus *fmb = &platform_fmb; + struct fixed_phy *fp, *tmp; + + list_for_each_entry_safe(fp, tmp, &fmb->phys, node) { + if (fp->addr == phy_addr) { + list_del(&fp->node); + if (fp->link_gpiod) + gpiod_put(fp->link_gpiod); + kfree(fp); + ida_free(&phy_fixed_ida, phy_addr); + return; + } + } +} + +#ifdef CONFIG_OF_GPIO +static struct gpio_desc *fixed_phy_get_gpiod(struct device_node *np) +{ + struct device_node *fixed_link_node; + struct gpio_desc *gpiod; + + if (!np) + return NULL; + + fixed_link_node = of_get_child_by_name(np, "fixed-link"); + if (!fixed_link_node) + return NULL; + + /* + * As the fixed link is just a device tree node without any + * Linux device associated with it, we simply have obtain + * the GPIO descriptor from the device tree like this. + */ + gpiod = fwnode_gpiod_get_index(of_fwnode_handle(fixed_link_node), + "link", 0, GPIOD_IN, "mdio"); + if (IS_ERR(gpiod) && PTR_ERR(gpiod) != -EPROBE_DEFER) { + if (PTR_ERR(gpiod) != -ENOENT) + pr_err("error getting GPIO for fixed link %pOF, proceed without\n", + fixed_link_node); + gpiod = NULL; + } + of_node_put(fixed_link_node); + + return gpiod; +} +#else +static struct gpio_desc *fixed_phy_get_gpiod(struct device_node *np) +{ + return NULL; +} +#endif + +static struct phy_device *__fixed_phy_register(unsigned int irq, + struct fixed_phy_status *status, + struct device_node *np, + struct gpio_desc *gpiod) +{ + struct fixed_mdio_bus *fmb = &platform_fmb; + struct phy_device *phy; + int phy_addr; + int ret; + + if (!fmb->mii_bus || fmb->mii_bus->state != MDIOBUS_REGISTERED) + return ERR_PTR(-EPROBE_DEFER); + + /* Check if we have a GPIO associated with this fixed phy */ + if (!gpiod) { + gpiod = fixed_phy_get_gpiod(np); + if (IS_ERR(gpiod)) + return ERR_CAST(gpiod); + } + + /* Get the next available PHY address, up to PHY_MAX_ADDR */ + phy_addr = ida_alloc_max(&phy_fixed_ida, PHY_MAX_ADDR - 1, GFP_KERNEL); + if (phy_addr < 0) + return ERR_PTR(phy_addr); + + ret = fixed_phy_add_gpiod(irq, phy_addr, status, gpiod); + if (ret < 0) { + ida_free(&phy_fixed_ida, phy_addr); + return ERR_PTR(ret); + } + + phy = get_phy_device(fmb->mii_bus, phy_addr, false); + if (IS_ERR(phy)) { + fixed_phy_del(phy_addr); + return ERR_PTR(-EINVAL); + } + + /* propagate the fixed link values to struct phy_device */ + phy->link = status->link; + if (status->link) { + phy->speed = status->speed; + phy->duplex = status->duplex; + phy->pause = status->pause; + phy->asym_pause = status->asym_pause; + } + + of_node_get(np); + phy->mdio.dev.of_node = np; + phy->is_pseudo_fixed_link = true; + + switch (status->speed) { + case SPEED_1000: + linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT, + phy->supported); + linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT, + phy->supported); + fallthrough; + case SPEED_100: + linkmode_set_bit(ETHTOOL_LINK_MODE_100baseT_Half_BIT, + phy->supported); + linkmode_set_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT, + phy->supported); + fallthrough; + case SPEED_10: + default: + linkmode_set_bit(ETHTOOL_LINK_MODE_10baseT_Half_BIT, + phy->supported); + linkmode_set_bit(ETHTOOL_LINK_MODE_10baseT_Full_BIT, + phy->supported); + } + + phy_advertise_supported(phy); + + ret = phy_device_register(phy); + if (ret) { + phy_device_free(phy); + of_node_put(np); + fixed_phy_del(phy_addr); + return ERR_PTR(ret); + } + + return phy; +} + +struct phy_device *fixed_phy_register(unsigned int irq, + struct fixed_phy_status *status, + struct device_node *np) +{ + return __fixed_phy_register(irq, status, np, NULL); +} +EXPORT_SYMBOL_GPL(fixed_phy_register); + +struct phy_device * +fixed_phy_register_with_gpiod(unsigned int irq, + struct fixed_phy_status *status, + struct gpio_desc *gpiod) +{ + return __fixed_phy_register(irq, status, NULL, gpiod); +} +EXPORT_SYMBOL_GPL(fixed_phy_register_with_gpiod); + +void fixed_phy_unregister(struct phy_device *phy) +{ + phy_device_remove(phy); + of_node_put(phy->mdio.dev.of_node); + fixed_phy_del(phy->mdio.addr); +} +EXPORT_SYMBOL_GPL(fixed_phy_unregister); + +static int __init fixed_mdio_bus_init(void) +{ + struct fixed_mdio_bus *fmb = &platform_fmb; + int ret; + + pdev = platform_device_register_simple("Fixed MDIO bus", 0, NULL, 0); + if (IS_ERR(pdev)) + return PTR_ERR(pdev); + + fmb->mii_bus = mdiobus_alloc(); + if (fmb->mii_bus == NULL) { + ret = -ENOMEM; + goto err_mdiobus_reg; + } + + snprintf(fmb->mii_bus->id, MII_BUS_ID_SIZE, "fixed-0"); + fmb->mii_bus->name = "Fixed MDIO Bus"; + fmb->mii_bus->priv = fmb; + fmb->mii_bus->parent = &pdev->dev; + fmb->mii_bus->read = &fixed_mdio_read; + fmb->mii_bus->write = &fixed_mdio_write; + fmb->mii_bus->phy_mask = ~0; + + ret = mdiobus_register(fmb->mii_bus); + if (ret) + goto err_mdiobus_alloc; + + return 0; + +err_mdiobus_alloc: + mdiobus_free(fmb->mii_bus); +err_mdiobus_reg: + platform_device_unregister(pdev); + return ret; +} +module_init(fixed_mdio_bus_init); + +static void __exit fixed_mdio_bus_exit(void) +{ + struct fixed_mdio_bus *fmb = &platform_fmb; + struct fixed_phy *fp, *tmp; + + mdiobus_unregister(fmb->mii_bus); + mdiobus_free(fmb->mii_bus); + platform_device_unregister(pdev); + + list_for_each_entry_safe(fp, tmp, &fmb->phys, node) { + list_del(&fp->node); + kfree(fp); + } + ida_destroy(&phy_fixed_ida); +} +module_exit(fixed_mdio_bus_exit); + +MODULE_DESCRIPTION("Fixed MDIO bus (MDIO bus emulation with fixed PHYs)"); +MODULE_AUTHOR("Vitaly Bordug"); +MODULE_LICENSE("GPL"); |