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From: Justin Chen <justin.chen@broadcom.com>
To: netdev@vger.kernel.org
Cc: florian.fainelli@broadcom.com,
	davem@davemloft.net,
	edumazet@google.com,
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	Justin Chen <justin.chen@broadcom.com>
Subject: [PATCH net-next v2 3/6] net: bcmasp: Add support for ASP 2.2
Date: Tue, 27 Feb 2024 10:54:51 -0800
Message-Id: <20240227185454.2767610-4-justin.chen@broadcom.com>
In-Reply-To: <20240227185454.2767610-1-justin.chen@broadcom.com>
References: <20240227185454.2767610-1-justin.chen@broadcom.com>
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--0000000000007500a206126190ab
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ASP 2.2 improves power savings during low power modes.

A new register was added to toggle to a slower clock during low
power modes.

EEE was broken for ASP 2.0/2.1. A HW workaround was added for
ASP 2.2 that requires toggling a chicken bit.

Signed-off-by: Justin Chen <justin.chen@broadcom.com>
Acked-by: Florian Fainelli <florian.fainelli@broadcom.com>
---
 drivers/net/ethernet/broadcom/asp2/bcmasp.c   | 73 +++++++++++++++++--
 drivers/net/ethernet/broadcom/asp2/bcmasp.h   | 18 ++++-
 .../net/ethernet/broadcom/asp2/bcmasp_intf.c  |  6 ++
 3 files changed, 87 insertions(+), 10 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/asp2/bcmasp.c b/drivers/net/ethernet/broadcom/asp2/bcmasp.c
index 80245c65cc90..100c69f3307a 100644
--- a/drivers/net/ethernet/broadcom/asp2/bcmasp.c
+++ b/drivers/net/ethernet/broadcom/asp2/bcmasp.c
@@ -972,7 +972,26 @@ static void bcmasp_core_init(struct bcmasp_priv *priv)
 		      ASP_INTR2_CLEAR);
 }
 
-static void bcmasp_core_clock_select(struct bcmasp_priv *priv, bool slow)
+static void bcmasp_core_clock_select_many(struct bcmasp_priv *priv, bool slow)
+{
+	u32 reg;
+
+	reg = ctrl2_core_rl(priv, ASP_CTRL2_CORE_CLOCK_SELECT);
+	if (slow)
+		reg &= ~ASP_CTRL2_CORE_CLOCK_SELECT_MAIN;
+	else
+		reg |= ASP_CTRL2_CORE_CLOCK_SELECT_MAIN;
+	ctrl2_core_wl(priv, reg, ASP_CTRL2_CORE_CLOCK_SELECT);
+
+	reg = ctrl2_core_rl(priv, ASP_CTRL2_CPU_CLOCK_SELECT);
+	if (slow)
+		reg &= ~ASP_CTRL2_CPU_CLOCK_SELECT_MAIN;
+	else
+		reg |= ASP_CTRL2_CPU_CLOCK_SELECT_MAIN;
+	ctrl2_core_wl(priv, reg, ASP_CTRL2_CPU_CLOCK_SELECT);
+}
+
+static void bcmasp_core_clock_select_one(struct bcmasp_priv *priv, bool slow)
 {
 	u32 reg;
 
@@ -1166,6 +1185,24 @@ static void bcmasp_wol_irq_destroy_per_intf(struct bcmasp_priv *priv)
 	}
 }
 
+static void bcmasp_eee_fixup(struct bcmasp_intf *intf, bool en)
+{
+	u32 reg, phy_lpi_overwrite;
+
+	reg = rx_edpkt_core_rl(intf->parent, ASP_EDPKT_SPARE_REG);
+	phy_lpi_overwrite = intf->internal_phy ? ASP_EDPKT_SPARE_REG_EPHY_LPI :
+			    ASP_EDPKT_SPARE_REG_GPHY_LPI;
+
+	if (en)
+		reg |= phy_lpi_overwrite;
+	else
+		reg &= ~phy_lpi_overwrite;
+
+	rx_edpkt_core_wl(intf->parent, reg, ASP_EDPKT_SPARE_REG);
+
+	usleep_range(50, 100);
+}
+
 static struct bcmasp_hw_info v20_hw_info = {
 	.rx_ctrl_flush = ASP_RX_CTRL_FLUSH,
 	.umac2fb = UMAC2FB_OFFSET,
@@ -1178,6 +1215,7 @@ 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,
+	.core_clock_select = bcmasp_core_clock_select_one,
 	.hw_info = &v20_hw_info,
 };
 
@@ -1194,17 +1232,39 @@ 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,
+	.core_clock_select = bcmasp_core_clock_select_one,
 	.hw_info = &v21_hw_info,
 };
 
+static const struct bcmasp_plat_data v22_plat_data = {
+	.init_wol = bcmasp_init_wol_shared,
+	.enable_wol = bcmasp_enable_wol_shared,
+	.destroy_wol = bcmasp_wol_irq_destroy_shared,
+	.core_clock_select = bcmasp_core_clock_select_many,
+	.hw_info = &v21_hw_info,
+	.eee_fixup = bcmasp_eee_fixup,
+};
+
+static void bcmasp_set_pdata(struct bcmasp_priv *priv, const struct bcmasp_plat_data *pdata)
+{
+	priv->init_wol = pdata->init_wol;
+	priv->enable_wol = pdata->enable_wol;
+	priv->destroy_wol = pdata->destroy_wol;
+	priv->core_clock_select = pdata->core_clock_select;
+	priv->eee_fixup = pdata->eee_fixup;
+	priv->hw_info = pdata->hw_info;
+}
+
 static const struct of_device_id bcmasp_of_match[] = {
 	{ .compatible = "brcm,asp-v2.0", .data = &v20_plat_data },
 	{ .compatible = "brcm,asp-v2.1", .data = &v21_plat_data },
+	{ .compatible = "brcm,asp-v2.2", .data = &v22_plat_data },
 	{ /* sentinel */ },
 };
 MODULE_DEVICE_TABLE(of, bcmasp_of_match);
 
 static const struct of_device_id bcmasp_mdio_of_match[] = {
+	{ .compatible = "brcm,asp-v2.2-mdio", },
 	{ .compatible = "brcm,asp-v2.1-mdio", },
 	{ .compatible = "brcm,asp-v2.0-mdio", },
 	{ /* sentinel */ },
@@ -1265,16 +1325,13 @@ static int bcmasp_probe(struct platform_device *pdev)
 	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;
+	bcmasp_set_pdata(priv, pdata);
 
 	/* Enable all clocks to ensure successful probing */
 	bcmasp_core_clock_set(priv, ASP_CTRL_CLOCK_CTRL_ASP_ALL_DISABLE, 0);
 
 	/* Switch to the main clock */
-	bcmasp_core_clock_select(priv, false);
+	priv->core_clock_select(priv, false);
 
 	bcmasp_intr2_mask_set_all(priv);
 	bcmasp_intr2_clear_all(priv);
@@ -1381,7 +1438,7 @@ static int __maybe_unused bcmasp_suspend(struct device *d)
 	 */
 	bcmasp_core_clock_set(priv, 0, ASP_CTRL_CLOCK_CTRL_ASP_TX_DISABLE);
 
-	bcmasp_core_clock_select(priv, true);
+	priv->core_clock_select(priv, true);
 
 	clk_disable_unprepare(priv->clk);
 
@@ -1399,7 +1456,7 @@ static int __maybe_unused bcmasp_resume(struct device *d)
 		return ret;
 
 	/* Switch to the main clock domain */
-	bcmasp_core_clock_select(priv, false);
+	priv->core_clock_select(priv, false);
 
 	/* Re-enable all clocks for re-initialization */
 	bcmasp_core_clock_set(priv, ASP_CTRL_CLOCK_CTRL_ASP_ALL_DISABLE, 0);
diff --git a/drivers/net/ethernet/broadcom/asp2/bcmasp.h b/drivers/net/ethernet/broadcom/asp2/bcmasp.h
index 312bf9b6576e..61598dc070b1 100644
--- a/drivers/net/ethernet/broadcom/asp2/bcmasp.h
+++ b/drivers/net/ethernet/broadcom/asp2/bcmasp.h
@@ -33,6 +33,12 @@
 #define ASP_WAKEUP_INTR2_FILT_1			BIT(3)
 #define ASP_WAKEUP_INTR2_FW			BIT(4)
 
+#define ASP_CTRL2_OFFSET			0x2000
+#define  ASP_CTRL2_CORE_CLOCK_SELECT		0x0
+#define   ASP_CTRL2_CORE_CLOCK_SELECT_MAIN	BIT(0)
+#define  ASP_CTRL2_CPU_CLOCK_SELECT		0x4
+#define   ASP_CTRL2_CPU_CLOCK_SELECT_MAIN	BIT(0)
+
 #define ASP_TX_ANALYTICS_OFFSET			0x4c000
 #define  ASP_TX_ANALYTICS_CTRL			0x0
 
@@ -134,8 +140,11 @@ enum asp_rx_net_filter_block {
 #define ASP_EDPKT_RX_PKT_CNT			0x138
 #define ASP_EDPKT_HDR_EXTR_CNT			0x13c
 #define ASP_EDPKT_HDR_OUT_CNT			0x140
+#define ASP_EDPKT_SPARE_REG			0x174
+#define  ASP_EDPKT_SPARE_REG_EPHY_LPI		BIT(4)
+#define  ASP_EDPKT_SPARE_REG_GPHY_LPI		BIT(3)
 
-#define ASP_CTRL				0x101000
+#define ASP_CTRL_OFFSET				0x101000
 #define  ASP_CTRL_ASP_SW_INIT			0x04
 #define   ASP_CTRL_ASP_SW_INIT_ACPUSS_CORE	BIT(0)
 #define   ASP_CTRL_ASP_SW_INIT_ASP_TX		BIT(1)
@@ -372,6 +381,8 @@ 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);
+	void (*core_clock_select)(struct bcmasp_priv *priv, bool slow);
+	void (*eee_fixup)(struct bcmasp_intf *priv, bool en);
 	struct bcmasp_hw_info		*hw_info;
 };
 
@@ -390,6 +401,8 @@ struct bcmasp_priv {
 	void (*init_wol)(struct bcmasp_priv *priv);
 	void (*enable_wol)(struct bcmasp_intf *intf, bool en);
 	void (*destroy_wol)(struct bcmasp_priv *priv);
+	void (*core_clock_select)(struct bcmasp_priv *priv, bool slow);
+	void (*eee_fixup)(struct bcmasp_intf *intf, bool en);
 
 	void __iomem			*base;
 	struct	bcmasp_hw_info		*hw_info;
@@ -530,7 +543,8 @@ BCMASP_CORE_IO_MACRO(rx_analytics, ASP_RX_ANALYTICS_OFFSET);
 BCMASP_CORE_IO_MACRO(rx_ctrl, ASP_RX_CTRL_OFFSET);
 BCMASP_CORE_IO_MACRO(rx_filter, ASP_RX_FILTER_OFFSET);
 BCMASP_CORE_IO_MACRO(rx_edpkt, ASP_EDPKT_OFFSET);
-BCMASP_CORE_IO_MACRO(ctrl, ASP_CTRL);
+BCMASP_CORE_IO_MACRO(ctrl, ASP_CTRL_OFFSET);
+BCMASP_CORE_IO_MACRO(ctrl2, ASP_CTRL2_OFFSET);
 
 struct bcmasp_intf *bcmasp_interface_create(struct bcmasp_priv *priv,
 					    struct device_node *ndev_dn, int i);
diff --git a/drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c b/drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c
index e429876c7291..36e6fae937ea 100644
--- a/drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c
+++ b/drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c
@@ -1333,6 +1333,9 @@ static void bcmasp_suspend_to_wol(struct bcmasp_intf *intf)
 				     ASP_WAKEUP_INTR2_MASK_CLEAR);
 	}
 
+	if (intf->eee.eee_enabled && intf->parent->eee_fixup)
+		intf->parent->eee_fixup(intf, true);
+
 	netif_dbg(intf, wol, ndev, "entered WOL mode\n");
 }
 
@@ -1381,6 +1384,9 @@ static void bcmasp_resume_from_wol(struct bcmasp_intf *intf)
 {
 	u32 reg;
 
+	if (intf->eee.eee_enabled && intf->parent->eee_fixup)
+		intf->parent->eee_fixup(intf, false);
+
 	reg = umac_rl(intf, UMC_MPD_CTRL);
 	reg &= ~UMC_MPD_CTRL_MPD_EN;
 	umac_wl(intf, reg, UMC_MPD_CTRL);
-- 
2.34.1


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