Message-Id: <1686953664-17498-5-git-send-email-justin.chen@broadcom.com>
Date:   Fri, 16 Jun 2023 15:14:17 -0700
From:   Justin Chen <justin.chen@...adcom.com>
To:     netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        bcm-kernel-feedback-list@...adcom.com
Cc:     florian.fainelli@...adcom.com, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        conor+dt@...nel.org, opendmb@...il.com, andrew@...n.ch,
        hkallweit1@...il.com, linux@...linux.org.uk,
        richardcochran@...il.com, sumit.semwal@...aro.org,
        christian.koenig@....com, simon.horman@...igine.com,
        Justin Chen <justin.chen@...adcom.com>
Subject: [PATCH net-next v8 04/11] net: bcmasp: Add support for WoL magic packet

Add support for Wake-On-Lan magic packet and magic packet with password.

Signed-off-by: Justin Chen <justin.chen@...adcom.com>
---
 drivers/net/ethernet/broadcom/asp2/bcmasp.c        | 148 +++++++++++++++++++++
 drivers/net/ethernet/broadcom/asp2/bcmasp.h        |  18 +++
 .../net/ethernet/broadcom/asp2/bcmasp_ethtool.c    |  36 +++++
 drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c   |  76 +++++++++--
 4 files changed, 266 insertions(+), 12 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/asp2/bcmasp.c b/drivers/net/ethernet/broadcom/asp2/bcmasp.c
index 34a0c7545ebd..40143bb566ef 100644
--- a/drivers/net/ethernet/broadcom/asp2/bcmasp.c
+++ b/drivers/net/ethernet/broadcom/asp2/bcmasp.c
@@ -440,6 +440,139 @@ static int bcmasp_is_port_valid(struct bcmasp_priv *priv, int port)
 	return port == 0 || port == 1;
 }
 
+static irqreturn_t bcmasp_isr_wol(int irq, void *data)
+{
+	struct bcmasp_priv *priv = data;
+	u32 status;
+
+	/* No L3 IRQ, so we good */
+	if (priv->wol_irq <= 0)
+		goto irq_handled;
+
+	status = wakeup_intr2_core_rl(priv, ASP_WAKEUP_INTR2_STATUS) &
+		~wakeup_intr2_core_rl(priv, ASP_WAKEUP_INTR2_MASK_STATUS);
+	wakeup_intr2_core_wl(priv, status, ASP_WAKEUP_INTR2_CLEAR);
+
+irq_handled:
+	pm_wakeup_event(&priv->pdev->dev, 0);
+	return IRQ_HANDLED;
+}
+
+static int bcmasp_get_and_request_irq(struct bcmasp_priv *priv, int i)
+{
+	struct platform_device *pdev = priv->pdev;
+	int irq, ret;
+
+	irq = platform_get_irq_optional(pdev, i);
+	if (irq < 0)
+		return irq;
+
+	ret = devm_request_irq(&pdev->dev, irq, bcmasp_isr_wol, 0,
+			       pdev->name, priv);
+	if (ret)
+		return ret;
+
+	return irq;
+}
+
+static void bcmasp_init_wol_shared(struct bcmasp_priv *priv)
+{
+	struct platform_device *pdev = priv->pdev;
+	struct device *dev = &pdev->dev;
+	int irq;
+
+	irq = bcmasp_get_and_request_irq(priv, 1);
+	if (irq < 0) {
+		dev_warn(dev, "Failed to init WoL irq: %d\n", irq);
+		return;
+	}
+
+	priv->wol_irq = irq;
+	priv->wol_irq_enabled_mask = 0;
+	device_set_wakeup_capable(&pdev->dev, 1);
+}
+
+static void bcmasp_enable_wol_shared(struct bcmasp_intf *intf, bool en)
+{
+	struct bcmasp_priv *priv = intf->parent;
+	struct device *dev = &priv->pdev->dev;
+
+	if (en) {
+		if (priv->wol_irq_enabled_mask) {
+			set_bit(intf->port, &priv->wol_irq_enabled_mask);
+			return;
+		}
+
+		/* First enable */
+		set_bit(intf->port, &priv->wol_irq_enabled_mask);
+		enable_irq_wake(priv->wol_irq);
+		device_set_wakeup_enable(dev, 1);
+	} else {
+		if (!priv->wol_irq_enabled_mask)
+			return;
+
+		clear_bit(intf->port, &priv->wol_irq_enabled_mask);
+		if (priv->wol_irq_enabled_mask)
+			return;
+
+		/* Last disable */
+		disable_irq_wake(priv->wol_irq);
+		device_set_wakeup_enable(dev, 0);
+	}
+}
+
+static void bcmasp_wol_irq_destroy_shared(struct bcmasp_priv *priv)
+{
+	if (priv->wol_irq > 0)
+		free_irq(priv->wol_irq, priv);
+}
+
+static void bcmasp_init_wol_per_intf(struct bcmasp_priv *priv)
+{
+	struct platform_device *pdev = priv->pdev;
+	struct device *dev = &pdev->dev;
+	struct bcmasp_intf *intf;
+	int irq, i;
+
+	for (i = 0; i < priv->intf_count; i++) {
+		intf = priv->intfs[i];
+		irq = bcmasp_get_and_request_irq(priv, intf->port + 1);
+		if (irq < 0) {
+			dev_warn(dev, "Failed to init WoL irq(port %d): %d\n",
+				 intf->port, irq);
+			continue;
+		}
+
+		intf->wol_irq = irq;
+		intf->wol_irq_enabled = false;
+		device_set_wakeup_capable(&pdev->dev, 1);
+	}
+}
+
+static void bcmasp_enable_wol_per_intf(struct bcmasp_intf *intf, bool en)
+{
+	struct device *dev = &intf->parent->pdev->dev;
+
+	if (en ^ intf->wol_irq_enabled)
+		irq_set_irq_wake(intf->wol_irq, en);
+
+	intf->wol_irq_enabled = en;
+	device_set_wakeup_enable(dev, en);
+}
+
+static void bcmasp_wol_irq_destroy_per_intf(struct bcmasp_priv *priv)
+{
+	struct bcmasp_intf *intf;
+	int i;
+
+	for (i = 0; i < priv->intf_count; i++) {
+		intf = priv->intfs[i];
+
+		if (intf->wol_irq > 0)
+			free_irq(intf->wol_irq, priv);
+	}
+}
+
 static struct bcmasp_hw_info v20_hw_info = {
 	.rx_ctrl_flush = ASP_RX_CTRL_FLUSH,
 	.umac2fb = UMAC2FB_OFFSET,
@@ -449,6 +582,9 @@ static struct bcmasp_hw_info v20_hw_info = {
 };
 
 static const struct bcmasp_plat_data v20_plat_data = {
+	.init_wol = bcmasp_init_wol_per_intf,
+	.enable_wol = bcmasp_enable_wol_per_intf,
+	.destroy_wol = bcmasp_wol_irq_destroy_per_intf,
 	.hw_info = &v20_hw_info,
 };
 
@@ -462,6 +598,9 @@ static struct bcmasp_hw_info v21_hw_info = {
 };
 
 static const struct bcmasp_plat_data v21_plat_data = {
+	.init_wol = bcmasp_init_wol_shared,
+	.enable_wol = bcmasp_enable_wol_shared,
+	.destroy_wol = bcmasp_wol_irq_destroy_shared,
 	.hw_info = &v21_hw_info,
 };
 
@@ -514,11 +653,15 @@ static int bcmasp_probe(struct platform_device *pdev)
 	priv->pdev = pdev;
 	spin_lock_init(&priv->mda_lock);
 	spin_lock_init(&priv->clk_lock);
+	mutex_init(&priv->wol_lock);
 
 	pdata = device_get_match_data(&pdev->dev);
 	if (!pdata)
 		return dev_err_probe(dev, -EINVAL, "unable to find platform data\n");
 
+	priv->init_wol = pdata->init_wol;
+	priv->enable_wol = pdata->enable_wol;
+	priv->destroy_wol = pdata->destroy_wol;
 	priv->hw_info = pdata->hw_info;
 
 	/* Enable all clocks to ensure successful probing */
@@ -578,6 +721,9 @@ static int bcmasp_probe(struct platform_device *pdev)
 		i++;
 	}
 
+	/* Check and enable WoL */
+	priv->init_wol(priv);
+
 	/* Drop the clock reference count now and let ndo_open()/ndo_close()
 	 * manage it for us from now on.
 	 */
@@ -616,6 +762,8 @@ static int bcmasp_remove(struct platform_device *pdev)
 	struct bcmasp_intf *intf;
 	int i;
 
+	priv->destroy_wol(priv);
+
 	for (i = 0; i < priv->intf_count; i++) {
 		intf = priv->intfs[i];
 		if (!intf)
diff --git a/drivers/net/ethernet/broadcom/asp2/bcmasp.h b/drivers/net/ethernet/broadcom/asp2/bcmasp.h
index 0f5c285c6187..c8b66a6af584 100644
--- a/drivers/net/ethernet/broadcom/asp2/bcmasp.h
+++ b/drivers/net/ethernet/broadcom/asp2/bcmasp.h
@@ -299,6 +299,12 @@ struct bcmasp_intf {
 
 	/* Statistics */
 	struct bcmasp_intf_stats64	stats64;
+
+	u32			wolopts;
+	u8			sopass[SOPASS_MAX];
+	/* Used if per intf wol irq */
+	int			wol_irq;
+	unsigned int		wol_irq_enabled:1;
 };
 
 #define NUM_MDA_FILTERS				32
@@ -321,6 +327,9 @@ struct bcmasp_hw_info {
 };
 
 struct bcmasp_plat_data {
+	void (*init_wol)(struct bcmasp_priv *priv);
+	void (*enable_wol)(struct bcmasp_intf *intf, bool en);
+	void (*destroy_wol)(struct bcmasp_priv *priv);
 	struct bcmasp_hw_info		*hw_info;
 };
 
@@ -331,6 +340,15 @@ struct bcmasp_priv {
 	int				irq;
 	u32				irq_mask;
 
+	/* Used if shared wol irq */
+	struct mutex			wol_lock;
+	int				wol_irq;
+	unsigned long			wol_irq_enabled_mask;
+
+	void (*init_wol)(struct bcmasp_priv *priv);
+	void (*enable_wol)(struct bcmasp_intf *intf, bool en);
+	void (*destroy_wol)(struct bcmasp_priv *priv);
+
 	void __iomem			*base;
 	struct	bcmasp_hw_info		*hw_info;
 
diff --git a/drivers/net/ethernet/broadcom/asp2/bcmasp_ethtool.c b/drivers/net/ethernet/broadcom/asp2/bcmasp_ethtool.c
index 394c0e1cb026..ae24a1f74d49 100644
--- a/drivers/net/ethernet/broadcom/asp2/bcmasp_ethtool.c
+++ b/drivers/net/ethernet/broadcom/asp2/bcmasp_ethtool.c
@@ -30,6 +30,40 @@ static void bcmasp_set_msglevel(struct net_device *dev, u32 level)
 	intf->msg_enable = level;
 }
 
+#define BCMASP_SUPPORTED_WAKE   (WAKE_MAGIC | WAKE_MAGICSECURE)
+static void bcmasp_get_wol(struct net_device *dev, struct ethtool_wolinfo *wol)
+{
+	struct bcmasp_intf *intf = netdev_priv(dev);
+
+	wol->supported = BCMASP_SUPPORTED_WAKE;
+	wol->wolopts = intf->wolopts;
+	memset(wol->sopass, 0, sizeof(wol->sopass));
+
+	if (wol->wolopts & WAKE_MAGICSECURE)
+		memcpy(wol->sopass, intf->sopass, sizeof(intf->sopass));
+}
+
+static int bcmasp_set_wol(struct net_device *dev, struct ethtool_wolinfo *wol)
+{
+	struct bcmasp_intf *intf = netdev_priv(dev);
+	struct bcmasp_priv *priv = intf->parent;
+	struct device *kdev = &priv->pdev->dev;
+
+	if (!device_can_wakeup(kdev))
+		return -EOPNOTSUPP;
+
+	/* Interface Specific */
+	intf->wolopts = wol->wolopts;
+	if (intf->wolopts & WAKE_MAGICSECURE)
+		memcpy(intf->sopass, wol->sopass, sizeof(wol->sopass));
+
+	mutex_lock(&priv->wol_lock);
+	priv->enable_wol(intf, !!intf->wolopts);
+	mutex_unlock(&priv->wol_lock);
+
+	return 0;
+}
+
 const struct ethtool_ops bcmasp_ethtool_ops = {
 	.get_drvinfo		= bcmasp_get_drvinfo,
 	.get_link		= ethtool_op_get_link,
@@ -37,4 +71,6 @@ const struct ethtool_ops bcmasp_ethtool_ops = {
 	.set_link_ksettings	= phy_ethtool_set_link_ksettings,
 	.get_msglevel		= bcmasp_get_msglevel,
 	.set_msglevel		= bcmasp_set_msglevel,
+	.get_wol		= bcmasp_get_wol,
+	.set_wol		= bcmasp_set_wol,
 };
diff --git a/drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c b/drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c
index 3882d65541c0..1f6f050f9059 100644
--- a/drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c
+++ b/drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c
@@ -1041,7 +1041,7 @@ static int bcmasp_netif_init(struct net_device *dev, bool phy_connect)
 			netdev_err(dev, "could not attach to PHY\n");
 			goto err_phy_disable;
 		}
-	} else {
+	} else if (!intf->wolopts) {
 		ret = phy_resume(dev->phydev);
 		if (ret)
 			goto err_phy_disable;
@@ -1297,8 +1297,39 @@ void bcmasp_interface_destroy(struct bcmasp_intf *intf, bool unregister)
 	free_netdev(intf->ndev);
 }
 
+static void bcmasp_suspend_to_wol(struct bcmasp_intf *intf)
+{
+	struct net_device *ndev = intf->ndev;
+	u32 reg;
+
+	reg = umac_rl(intf, UMC_MPD_CTRL);
+	if (intf->wolopts & (WAKE_MAGIC | WAKE_MAGICSECURE))
+		reg |= UMC_MPD_CTRL_MPD_EN;
+	reg &= ~UMC_MPD_CTRL_PSW_EN;
+	if (intf->wolopts & WAKE_MAGICSECURE) {
+		/* Program the SecureOn password */
+		umac_wl(intf, get_unaligned_be16(&intf->sopass[0]),
+			UMC_PSW_MS);
+		umac_wl(intf, get_unaligned_be32(&intf->sopass[2]),
+			UMC_PSW_LS);
+		reg |= UMC_MPD_CTRL_PSW_EN;
+	}
+	umac_wl(intf, reg, UMC_MPD_CTRL);
+
+	/* UniMAC receive needs to be turned on */
+	umac_enable_set(intf, UMC_CMD_RX_EN, 1);
+
+	if (intf->parent->wol_irq > 0) {
+		wakeup_intr2_core_wl(intf->parent, 0xffffffff,
+				     ASP_WAKEUP_INTR2_MASK_CLEAR);
+	}
+
+	netif_dbg(intf, wol, ndev, "entered WOL mode\n");
+}
+
 int bcmasp_interface_suspend(struct bcmasp_intf *intf)
 {
+	struct device *kdev = &intf->parent->pdev->dev;
 	struct net_device *dev = intf->ndev;
 	int ret = 0;
 
@@ -1309,19 +1340,24 @@ int bcmasp_interface_suspend(struct bcmasp_intf *intf)
 
 	bcmasp_netif_deinit(dev);
 
-	ret = phy_suspend(dev->phydev);
-	if (ret)
-		goto out;
+	if (!intf->wolopts) {
+		ret = phy_suspend(dev->phydev);
+		if (ret)
+			goto out;
 
-	if (intf->internal_phy)
-		bcmasp_ephy_enable_set(intf, false);
-	else
-		bcmasp_rgmii_mode_en_set(intf, false);
+		if (intf->internal_phy)
+			bcmasp_ephy_enable_set(intf, false);
+		else
+			bcmasp_rgmii_mode_en_set(intf, false);
 
-	/* If Wake-on-LAN is disabled, we can safely
-	 * disable the network interface clocks.
-	 */
-	bcmasp_core_clock_set_intf(intf, false);
+		/* If Wake-on-LAN is disabled, we can safely
+		 * disable the network interface clocks.
+		 */
+		bcmasp_core_clock_set_intf(intf, false);
+	}
+
+	if (device_may_wakeup(kdev) && intf->wolopts)
+		bcmasp_suspend_to_wol(intf);
 
 	clk_disable_unprepare(intf->parent->clk);
 
@@ -1332,6 +1368,20 @@ int bcmasp_interface_suspend(struct bcmasp_intf *intf)
 	return ret;
 }
 
+static void bcmasp_resume_from_wol(struct bcmasp_intf *intf)
+{
+	u32 reg;
+
+	reg = umac_rl(intf, UMC_MPD_CTRL);
+	reg &= ~UMC_MPD_CTRL_MPD_EN;
+	umac_wl(intf, reg, UMC_MPD_CTRL);
+
+	if (intf->parent->wol_irq > 0) {
+		wakeup_intr2_core_wl(intf->parent, 0xffffffff,
+				     ASP_WAKEUP_INTR2_MASK_SET);
+	}
+}
+
 int bcmasp_interface_resume(struct bcmasp_intf *intf)
 {
 	struct net_device *dev = intf->ndev;
@@ -1348,6 +1398,8 @@ int bcmasp_interface_resume(struct bcmasp_intf *intf)
 	if (ret)
 		goto out;
 
+	bcmasp_resume_from_wol(intf);
+
 	netif_device_attach(dev);
 
 	return 0;
-- 
2.7.4


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