Merge branch 'net-ibm-emac-modernize-a-bit'

Rosen Penev says:

====================
net: ibm: emac: modernize a bit
====================

Link: https://patch.msgid.link/20240912024903.6201-1-rosenp@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

2 files changed, 71 insertions, 152 deletions

diff --git a/drivers/net/ethernet/ibm/emac/core.c b/drivers/net/ethernet/ibm/emac/core.c
index 6ace55837172..dac570f3c110 100644
--- a/drivers/net/ethernet/ibm/emac/core.c
+++ b/drivers/net/ethernet/ibm/emac/core.c
@@ -32,7 +32,6 @@
 #include <linux/ethtool.h>
 #include <linux/mii.h>
 #include <linux/bitops.h>
-#include <linux/workqueue.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
@@ -96,11 +95,6 @@ MODULE_LICENSE("GPL");
 static u32 busy_phy_map;
 static DEFINE_MUTEX(emac_phy_map_lock);
 
-/* This is the wait queue used to wait on any event related to probe, that
- * is discovery of MALs, other EMACs, ZMII/RGMIIs, etc...
- */
-static DECLARE_WAIT_QUEUE_HEAD(emac_probe_wait);
-
 /* Having stable interface names is a doomed idea. However, it would be nice
  * if we didn't have completely random interface names at boot too :-) It's
  * just a matter of making everybody's life easier. Since we are doing
@@ -116,9 +110,6 @@ static DECLARE_WAIT_QUEUE_HEAD(emac_probe_wait);
 #define EMAC_BOOT_LIST_SIZE	4
 static struct device_node *emac_boot_list[EMAC_BOOT_LIST_SIZE];
 
-/* How long should I wait for dependent devices ? */
-#define EMAC_PROBE_DEP_TIMEOUT	(HZ * 5)
-
 /* I don't want to litter system log with timeout errors
  * when we have brain-damaged PHY.
  */
@@ -973,8 +964,6 @@ static void __emac_set_multicast_list(struct emac_instance *dev)
 	 * we need is just to stop RX channel. This seems to work on all
 	 * tested SoCs.                                                --ebs
 	 *
-	 * If we need the full reset, we might just trigger the workqueue
-	 * and do it async... a bit nasty but should work --BenH
 	 */
 	dev->mcast_pending = 0;
 	emac_rx_disable(dev);
@@ -1228,18 +1217,10 @@ static void emac_print_link_status(struct emac_instance *dev)
 static int emac_open(struct net_device *ndev)
 {
 	struct emac_instance *dev = netdev_priv(ndev);
-	int err, i;
+	int i;
 
 	DBG(dev, "open" NL);
 
-	/* Setup error IRQ handler */
-	err = request_irq(dev->emac_irq, emac_irq, 0, "EMAC", dev);
-	if (err) {
-		printk(KERN_ERR "%s: failed to request IRQ %d\n",
-		       ndev->name, dev->emac_irq);
-		return err;
-	}
-
 	/* Allocate RX ring */
 	for (i = 0; i < NUM_RX_BUFF; ++i)
 		if (emac_alloc_rx_skb(dev, i)) {
@@ -1293,8 +1274,6 @@ static int emac_open(struct net_device *ndev)
 	return 0;
  oom:
 	emac_clean_rx_ring(dev);
-	free_irq(dev->emac_irq, dev);
-
 	return -ENOMEM;
 }
 
@@ -1408,8 +1387,6 @@ static int emac_close(struct net_device *ndev)
 	emac_clean_tx_ring(dev);
 	emac_clean_rx_ring(dev);
 
-	free_irq(dev->emac_irq, dev);
-
 	netif_carrier_off(ndev);
 
 	return 0;
@@ -2390,7 +2367,9 @@ static int emac_check_deps(struct emac_instance *dev,
 		if (deps[i].drvdata != NULL)
 			there++;
 	}
-	return there == EMAC_DEP_COUNT;
+	if (there != EMAC_DEP_COUNT)
+		return -EPROBE_DEFER;
+	return 0;
 }
 
 static void emac_put_deps(struct emac_instance *dev)
@@ -2402,19 +2381,6 @@ static void emac_put_deps(struct emac_instance *dev)
 	platform_device_put(dev->tah_dev);
 }
 
-static int emac_of_bus_notify(struct notifier_block *nb, unsigned long action,
-			      void *data)
-{
-	/* We are only intereted in device addition */
-	if (action == BUS_NOTIFY_BOUND_DRIVER)
-		wake_up_all(&emac_probe_wait);
-	return 0;
-}
-
-static struct notifier_block emac_of_bus_notifier = {
-	.notifier_call = emac_of_bus_notify
-};
-
 static int emac_wait_deps(struct emac_instance *dev)
 {
 	struct emac_depentry deps[EMAC_DEP_COUNT];
@@ -2431,18 +2397,13 @@ static int emac_wait_deps(struct emac_instance *dev)
 		deps[EMAC_DEP_MDIO_IDX].phandle = dev->mdio_ph;
 	if (dev->blist && dev->blist > emac_boot_list)
 		deps[EMAC_DEP_PREV_IDX].phandle = 0xffffffffu;
-	bus_register_notifier(&platform_bus_type, &emac_of_bus_notifier);
-	wait_event_timeout(emac_probe_wait,
-			   emac_check_deps(dev, deps),
-			   EMAC_PROBE_DEP_TIMEOUT);
-	bus_unregister_notifier(&platform_bus_type, &emac_of_bus_notifier);
-	err = emac_check_deps(dev, deps) ? 0 : -ENODEV;
+	err = emac_check_deps(dev, deps);
 	for (i = 0; i < EMAC_DEP_COUNT; i++) {
 		of_node_put(deps[i].node);
 		if (err)
 			platform_device_put(deps[i].ofdev);
 	}
-	if (err == 0) {
+	if (!err) {
 		dev->mal_dev = deps[EMAC_DEP_MAL_IDX].ofdev;
 		dev->zmii_dev = deps[EMAC_DEP_ZMII_IDX].ofdev;
 		dev->rgmii_dev = deps[EMAC_DEP_RGMII_IDX].ofdev;
@@ -2456,22 +2417,21 @@ static int emac_wait_deps(struct emac_instance *dev)
 static int emac_read_uint_prop(struct device_node *np, const char *name,
 			       u32 *val, int fatal)
 {
-	int len;
-	const u32 *prop = of_get_property(np, name, &len);
-	if (prop == NULL || len < sizeof(u32)) {
+	int err;
+
+	err = of_property_read_u32(np, name, val);
+	if (err) {
 		if (fatal)
-			printk(KERN_ERR "%pOF: missing %s property\n",
-			       np, name);
-		return -ENODEV;
+			pr_err("%pOF: missing %s property", np, name);
+		return err;
 	}
-	*val = *prop;
 	return 0;
 }
 
 static void emac_adjust_link(struct net_device *ndev)
 {
 	struct emac_instance *dev = netdev_priv(ndev);
-	struct phy_device *phy = dev->phy_dev;
+	struct phy_device *phy = ndev->phydev;
 
 	dev->phy.autoneg = phy->autoneg;
 	dev->phy.speed = phy->speed;
@@ -2522,22 +2482,20 @@ static int emac_mdio_phy_start_aneg(struct mii_phy *phy,
 static int emac_mdio_setup_aneg(struct mii_phy *phy, u32 advertise)
 {
 	struct net_device *ndev = phy->dev;
-	struct emac_instance *dev = netdev_priv(ndev);
 
 	phy->autoneg = AUTONEG_ENABLE;
 	phy->advertising = advertise;
-	return emac_mdio_phy_start_aneg(phy, dev->phy_dev);
+	return emac_mdio_phy_start_aneg(phy, ndev->phydev);
 }
 
 static int emac_mdio_setup_forced(struct mii_phy *phy, int speed, int fd)
 {
 	struct net_device *ndev = phy->dev;
-	struct emac_instance *dev = netdev_priv(ndev);
 
 	phy->autoneg = AUTONEG_DISABLE;
 	phy->speed = speed;
 	phy->duplex = fd;
-	return emac_mdio_phy_start_aneg(phy, dev->phy_dev);
+	return emac_mdio_phy_start_aneg(phy, ndev->phydev);
 }
 
 static int emac_mdio_poll_link(struct mii_phy *phy)
@@ -2546,20 +2504,19 @@ static int emac_mdio_poll_link(struct mii_phy *phy)
 	struct emac_instance *dev = netdev_priv(ndev);
 	int res;
 
-	res = phy_read_status(dev->phy_dev);
+	res = phy_read_status(ndev->phydev);
 	if (res) {
 		dev_err(&dev->ofdev->dev, "link update failed (%d).", res);
 		return ethtool_op_get_link(ndev);
 	}
 
-	return dev->phy_dev->link;
+	return ndev->phydev->link;
 }
 
 static int emac_mdio_read_link(struct mii_phy *phy)
 {
 	struct net_device *ndev = phy->dev;
-	struct emac_instance *dev = netdev_priv(ndev);
-	struct phy_device *phy_dev = dev->phy_dev;
+	struct phy_device *phy_dev = ndev->phydev;
 	int res;
 
 	res = phy_read_status(phy_dev);
@@ -2576,10 +2533,9 @@ static int emac_mdio_read_link(struct mii_phy *phy)
 static int emac_mdio_init_phy(struct mii_phy *phy)
 {
 	struct net_device *ndev = phy->dev;
-	struct emac_instance *dev = netdev_priv(ndev);
 
-	phy_start(dev->phy_dev);
-	return phy_init_hw(dev->phy_dev);
+	phy_start(ndev->phydev);
+	return phy_init_hw(ndev->phydev);
 }
 
 static const struct mii_phy_ops emac_dt_mdio_phy_ops = {
@@ -2593,6 +2549,7 @@ static const struct mii_phy_ops emac_dt_mdio_phy_ops = {
 static int emac_dt_mdio_probe(struct emac_instance *dev)
 {
 	struct device_node *mii_np;
+	struct mii_bus *bus;
 	int res;
 
 	mii_np = of_get_child_by_name(dev->ofdev->dev.of_node, "mdio");
@@ -2606,23 +2563,23 @@ static int emac_dt_mdio_probe(struct emac_instance *dev)
 		goto put_node;
 	}
 
-	dev->mii_bus = devm_mdiobus_alloc(&dev->ofdev->dev);
-	if (!dev->mii_bus) {
+	bus = devm_mdiobus_alloc(&dev->ofdev->dev);
+	if (!bus) {
 		res = -ENOMEM;
 		goto put_node;
 	}
 
-	dev->mii_bus->priv = dev->ndev;
-	dev->mii_bus->parent = dev->ndev->dev.parent;
-	dev->mii_bus->name = "emac_mdio";
-	dev->mii_bus->read = &emac_mii_bus_read;
-	dev->mii_bus->write = &emac_mii_bus_write;
-	dev->mii_bus->reset = &emac_mii_bus_reset;
-	snprintf(dev->mii_bus->id, MII_BUS_ID_SIZE, "%s", dev->ofdev->name);
-	res = of_mdiobus_register(dev->mii_bus, mii_np);
+	bus->priv = dev->ndev;
+	bus->parent = dev->ndev->dev.parent;
+	bus->name = "emac_mdio";
+	bus->read = &emac_mii_bus_read;
+	bus->write = &emac_mii_bus_write;
+	bus->reset = &emac_mii_bus_reset;
+	snprintf(bus->id, MII_BUS_ID_SIZE, "%s", dev->ofdev->name);
+	res = devm_of_mdiobus_register(&dev->ofdev->dev, bus, mii_np);
 	if (res) {
 		dev_err(&dev->ofdev->dev, "cannot register MDIO bus %s (%d)",
-			dev->mii_bus->name, res);
+			bus->name, res);
 	}
 
  put_node:
@@ -2633,26 +2590,28 @@ static int emac_dt_mdio_probe(struct emac_instance *dev)
 static int emac_dt_phy_connect(struct emac_instance *dev,
 			       struct device_node *phy_handle)
 {
+	struct phy_device *phy_dev;
+
 	dev->phy.def = devm_kzalloc(&dev->ofdev->dev, sizeof(*dev->phy.def),
 				    GFP_KERNEL);
 	if (!dev->phy.def)
 		return -ENOMEM;
 
-	dev->phy_dev = of_phy_connect(dev->ndev, phy_handle, &emac_adjust_link,
-				      0, dev->phy_mode);
-	if (!dev->phy_dev) {
+	phy_dev = of_phy_connect(dev->ndev, phy_handle, &emac_adjust_link, 0,
+				 dev->phy_mode);
+	if (!phy_dev) {
 		dev_err(&dev->ofdev->dev, "failed to connect to PHY.\n");
 		return -ENODEV;
 	}
 
-	dev->phy.def->phy_id = dev->phy_dev->drv->phy_id;
-	dev->phy.def->phy_id_mask = dev->phy_dev->drv->phy_id_mask;
-	dev->phy.def->name = dev->phy_dev->drv->name;
+	dev->phy.def->phy_id = phy_dev->drv->phy_id;
+	dev->phy.def->phy_id_mask = phy_dev->drv->phy_id_mask;
+	dev->phy.def->name = phy_dev->drv->name;
 	dev->phy.def->ops = &emac_dt_mdio_phy_ops;
 	ethtool_convert_link_mode_to_legacy_u32(&dev->phy.features,
-						dev->phy_dev->supported);
-	dev->phy.address = dev->phy_dev->mdio.addr;
-	dev->phy.mode = dev->phy_dev->interface;
+						phy_dev->supported);
+	dev->phy.address = phy_dev->mdio.addr;
+	dev->phy.mode = phy_dev->interface;
 	return 0;
 }
 
@@ -2668,8 +2627,6 @@ static int emac_dt_phy_probe(struct emac_instance *dev)
 		res = emac_dt_mdio_probe(dev);
 		if (!res) {
 			res = emac_dt_phy_connect(dev, phy_handle);
-			if (res)
-				mdiobus_unregister(dev->mii_bus);
 		}
 	}
 
@@ -2708,13 +2665,11 @@ static int emac_init_phy(struct emac_instance *dev)
 				return res;
 
 			res = of_phy_register_fixed_link(np);
-			dev->phy_dev = of_phy_find_device(np);
-			if (res || !dev->phy_dev) {
-				mdiobus_unregister(dev->mii_bus);
+			ndev->phydev = of_phy_find_device(np);
+			if (res || !ndev->phydev)
 				return res ? res : -EINVAL;
-			}
 			emac_adjust_link(dev->ndev);
-			put_device(&dev->phy_dev->mdio.dev);
+			put_device(&ndev->phydev->mdio.dev);
 		}
 		return 0;
 	}
@@ -3053,7 +3008,7 @@ static int emac_probe(struct platform_device *ofdev)
 
 	/* Allocate our net_device structure */
 	err = -ENOMEM;
-	ndev = alloc_etherdev(sizeof(struct emac_instance));
+	ndev = devm_alloc_etherdev(&ofdev->dev, sizeof(struct emac_instance));
 	if (!ndev)
 		goto err_gone;
 
@@ -3072,35 +3027,40 @@ static int emac_probe(struct platform_device *ofdev)
 	/* Init various config data based on device-tree */
 	err = emac_init_config(dev);
 	if (err)
-		goto err_free;
+		goto err_gone;
 
-	/* Get interrupts. EMAC irq is mandatory, WOL irq is optional */
+	/* Get interrupts. EMAC irq is mandatory */
 	dev->emac_irq = irq_of_parse_and_map(np, 0);
-	dev->wol_irq = irq_of_parse_and_map(np, 1);
 	if (!dev->emac_irq) {
 		printk(KERN_ERR "%pOF: Can't map main interrupt\n", np);
 		err = -ENODEV;
-		goto err_free;
+		goto err_gone;
+	}
+
+	/* Setup error IRQ handler */
+	err = devm_request_irq(&ofdev->dev, dev->emac_irq, emac_irq, 0, "EMAC",
+			       dev);
+	if (err) {
+		dev_err_probe(&ofdev->dev, err, "failed to request IRQ %d",
+			      dev->emac_irq);
+		goto err_gone;
 	}
+
 	ndev->irq = dev->emac_irq;
 
 	/* Map EMAC regs */
 	// TODO : platform_get_resource() and devm_ioremap_resource()
-	dev->emacp = of_iomap(np, 0);
-	if (dev->emacp == NULL) {
-		printk(KERN_ERR "%pOF: Can't map device registers!\n", np);
+	dev->emacp = devm_of_iomap(&ofdev->dev, np, 0, NULL);
+	if (!dev->emacp) {
+		dev_err(&ofdev->dev, "can't map device registers");
 		err = -ENOMEM;
-		goto err_irq_unmap;
+		goto err_gone;
 	}
 
 	/* Wait for dependent devices */
 	err = emac_wait_deps(dev);
-	if (err) {
-		printk(KERN_ERR
-		       "%pOF: Timeout waiting for dependent devices\n", np);
-		/*  display more info about what's missing ? */
-		goto err_reg_unmap;
-	}
+	if (err)
+		goto err_gone;
 	dev->mal = platform_get_drvdata(dev->mal_dev);
 	if (dev->mdio_dev != NULL)
 		dev->mdio_instance = platform_get_drvdata(dev->mdio_dev);
@@ -3187,7 +3147,7 @@ static int emac_probe(struct platform_device *ofdev)
 
 	netif_carrier_off(ndev);
 
-	err = register_netdev(ndev);
+	err = devm_register_netdev(&ofdev->dev, ndev);
 	if (err) {
 		printk(KERN_ERR "%pOF: failed to register net device (%d)!\n",
 		       np, err);
@@ -3200,10 +3160,6 @@ static int emac_probe(struct platform_device *ofdev)
 	wmb();
 	platform_set_drvdata(ofdev, dev);
 
-	/* There's a new kid in town ! Let's tell everybody */
-	wake_up_all(&emac_probe_wait);
-
-
 	printk(KERN_INFO "%s: EMAC-%d %pOF, MAC %pM\n",
 	       ndev->name, dev->cell_index, np, ndev->dev_addr);
 
@@ -3232,24 +3188,9 @@ static int emac_probe(struct platform_device *ofdev)
 	mal_unregister_commac(dev->mal, &dev->commac);
  err_rel_deps:
 	emac_put_deps(dev);
- err_reg_unmap:
-	iounmap(dev->emacp);
- err_irq_unmap:
-	if (dev->wol_irq)
-		irq_dispose_mapping(dev->wol_irq);
-	if (dev->emac_irq)
-		irq_dispose_mapping(dev->emac_irq);
- err_free:
-	free_netdev(ndev);
  err_gone:
-	/* if we were on the bootlist, remove us as we won't show up and
-	 * wake up all waiters to notify them in case they were waiting
-	 * on us
-	 */
-	if (blist) {
+	if (blist)
 		*blist = NULL;
-		wake_up_all(&emac_probe_wait);
-	}
 	return err;
 }
 
@@ -3259,8 +3200,6 @@ static void emac_remove(struct platform_device *ofdev)
 
 	DBG(dev, "remove" NL);
 
-	unregister_netdev(dev->ndev);
-
 	cancel_work_sync(&dev->reset_work);
 
 	if (emac_has_feature(dev, EMAC_FTR_HAS_TAH))
@@ -3270,26 +3209,11 @@ static void emac_remove(struct platform_device *ofdev)
 	if (emac_has_feature(dev, EMAC_FTR_HAS_ZMII))
 		zmii_detach(dev->zmii_dev, dev->zmii_port);
 
-	if (dev->phy_dev)
-		phy_disconnect(dev->phy_dev);
-
-	if (dev->mii_bus)
-		mdiobus_unregister(dev->mii_bus);
-
 	busy_phy_map &= ~(1 << dev->phy.address);
 	DBG(dev, "busy_phy_map now %#x" NL, busy_phy_map);
 
 	mal_unregister_commac(dev->mal, &dev->commac);
 	emac_put_deps(dev);
-
-	iounmap(dev->emacp);
-
-	if (dev->wol_irq)
-		irq_dispose_mapping(dev->wol_irq);
-	if (dev->emac_irq)
-		irq_dispose_mapping(dev->emac_irq);
-
-	free_netdev(dev->ndev);
 }
 
 /* XXX Features in here should be replaced by properties... */
@@ -3328,16 +3252,15 @@ static void __init emac_make_bootlist(void)
 
 	/* Collect EMACs */
 	while((np = of_find_all_nodes(np)) != NULL) {
-		const u32 *idx;
+		u32 idx;
 
 		if (of_match_node(emac_match, np) == NULL)
 			continue;
 		if (of_property_read_bool(np, "unused"))
 			continue;
-		idx = of_get_property(np, "cell-index", NULL);
-		if (idx == NULL)
+		if (of_property_read_u32(np, "cell-index", &idx))
 			continue;
-		cell_indices[i] = *idx;
+		cell_indices[i] = idx;
 		emac_boot_list[i++] = of_node_get(np);
 		if (i >= EMAC_BOOT_LIST_SIZE) {
 			of_node_put(np);
diff --git a/drivers/net/ethernet/ibm/emac/core.h b/drivers/net/ethernet/ibm/emac/core.h
index d8664bd65e1f..89fa1683ec3c 100644
--- a/drivers/net/ethernet/ibm/emac/core.h
+++ b/drivers/net/ethernet/ibm/emac/core.h
@@ -188,10 +188,6 @@ struct emac_instance {
 	struct emac_instance		*mdio_instance;
 	struct mutex			mdio_lock;
 
-	/* Device-tree based phy configuration */
-	struct mii_bus			*mii_bus;
-	struct phy_device		*phy_dev;
-
 	/* ZMII infos if any */
 	u32				zmii_ph;
 	u32				zmii_port;