ASR_BASE
Change-Id: Icf3719cc0afe3eeb3edc7fa80a2eb5199ca9dda1
diff --git a/marvell/linux/drivers/net/phy/fixed_phy.c b/marvell/linux/drivers/net/phy/fixed_phy.c
new file mode 100644
index 0000000..4190f9e
--- /dev/null
+++ b/marvell/linux/drivers/net/phy/fixed_phy.c
@@ -0,0 +1,396 @@
+// 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/seqlock.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;
+ seqcount_t seqcount;
+ 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;
+ int s;
+
+ do {
+ s = read_seqcount_begin(&fp->seqcount);
+ 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;
+ } while (read_seqcount_retry(&fp->seqcount, s));
+
+ 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;
+
+ seqcount_init(&fp->seqcount);
+
+ 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_simple_remove(&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 = gpiod_get_from_of_node(fixed_link_node, "link-gpios", 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_simple_get(&phy_fixed_ida, 0, PHY_MAX_ADDR, 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_simple_remove(&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);
+ /* fall through */
+ 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);
+ /* fall through */
+ 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;
+
+ 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");