netdev - [PATCH net-next v7 7/9] net: stmmac: dwmac-loongson: Add GNET support

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Date: Tue, 19 Dec 2023 22:26:47 +0800
From: Yanteng Si <siyanteng@...ngson.cn>
To: andrew@...n.ch,
	hkallweit1@...il.com,
	peppe.cavallaro@...com,
	alexandre.torgue@...s.st.com,
	joabreu@...opsys.com
Cc: Yanteng Si <siyanteng@...ngson.cn>,
	fancer.lancer@...il.com,
	Jose.Abreu@...opsys.com,
	chenhuacai@...ngson.cn,
	linux@...linux.org.uk,
	guyinggang@...ngson.cn,
	netdev@...r.kernel.org,
	chris.chenfeiyang@...il.com
Subject: [PATCH net-next v7 7/9] net: stmmac: dwmac-loongson: Add GNET support

Add Loongson GNET (GMAC with PHY) support. Current GNET does not support
half duplex mode, and GNET on LS7A only supports ANE when speed is set to
1000M.

Signed-off-by: Yanteng Si <siyanteng@...ngson.cn>
Signed-off-by: Feiyang Chen <chenfeiyang@...ngson.cn>
Signed-off-by: Yinggang Gu <guyinggang@...ngson.cn>
---
 .../ethernet/stmicro/stmmac/dwmac-loongson.c  | 79 +++++++++++++++++++
 .../ethernet/stmicro/stmmac/stmmac_ethtool.c  |  6 ++
 include/linux/stmmac.h                        |  2 +
 3 files changed, 87 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c
index 2c08d5495214..9e4953c7e4e0 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c
@@ -168,6 +168,83 @@ static struct stmmac_pci_info loongson_gmac_pci_info = {
 	.config = loongson_gmac_config,
 };
 
+static void loongson_gnet_fix_speed(void *priv, unsigned int speed, unsigned int mode)
+{
+	struct net_device *ndev = dev_get_drvdata(priv);
+	struct stmmac_priv *ptr = netdev_priv(ndev);
+
+	/* The controller and PHY don't work well together.
+	 * We need to use the PS bit to check if the controller's status
+	 * is correct and reset PHY if necessary.
+	 */
+	if (speed == SPEED_1000)
+		if (readl(ptr->ioaddr + MAC_CTRL_REG) & (1 << 15) /* PS */)
+			phy_restart_aneg(ndev->phydev);
+}
+
+static int loongson_gnet_data(struct pci_dev *pdev,
+			      struct plat_stmmacenet_data *plat)
+{
+	loongson_default_data(pdev, plat);
+
+	plat->multicast_filter_bins = 256;
+
+	plat->mdio_bus_data->phy_mask = 0xfffffffb;
+
+	plat->phy_addr = 2;
+	plat->phy_interface = PHY_INTERFACE_MODE_INTERNAL;
+
+	plat->bsp_priv = &pdev->dev;
+	plat->fix_mac_speed = loongson_gnet_fix_speed;
+
+	plat->dma_cfg->pbl = 32;
+	plat->dma_cfg->pblx8 = true;
+
+	plat->clk_ref_rate = 125000000;
+	plat->clk_ptp_rate = 125000000;
+
+	return 0;
+}
+
+static int loongson_gnet_config(struct pci_dev *pdev,
+				struct plat_stmmacenet_data *plat,
+				struct stmmac_resources *res,
+				struct device_node *np)
+{
+	int ret;
+	u32 version = readl(res->addr + GMAC_VERSION);
+
+	switch (version & 0xff) {
+	case DWLGMAC_CORE_1_00:
+		ret = loongson_dwmac_config_multi_msi(pdev, plat, res, np, 8);
+		break;
+	default:
+		ret = loongson_dwmac_config_legacy(pdev, plat, res, np);
+		break;
+	}
+
+	switch (pdev->revision) {
+	case 0x00:
+		plat->flags |=
+			FIELD_PREP(STMMAC_FLAG_DISABLE_HALF_DUPLEX, 1) |
+			FIELD_PREP(STMMAC_FLAG_DISABLE_FORCE_1000, 1);
+		break;
+	case 0x01:
+		plat->flags |=
+			FIELD_PREP(STMMAC_FLAG_DISABLE_HALF_DUPLEX, 1);
+		break;
+	default:
+		break;
+	}
+
+	return ret;
+}
+
+static struct stmmac_pci_info loongson_gnet_pci_info = {
+	.setup = loongson_gnet_data,
+	.config = loongson_gnet_config,
+};
+
 static int loongson_dwmac_probe(struct pci_dev *pdev,
 				const struct pci_device_id *id)
 {
@@ -318,9 +395,11 @@ static SIMPLE_DEV_PM_OPS(loongson_dwmac_pm_ops, loongson_dwmac_suspend,
 			 loongson_dwmac_resume);
 
 #define PCI_DEVICE_ID_LOONGSON_GMAC	0x7a03
+#define PCI_DEVICE_ID_LOONGSON_GNET	0x7a13
 
 static const struct pci_device_id loongson_dwmac_id_table[] = {
 	{ PCI_DEVICE_DATA(LOONGSON, GMAC, &loongson_gmac_pci_info) },
+	{ PCI_DEVICE_DATA(LOONGSON, GNET, &loongson_gnet_pci_info) },
 	{}
 };
 MODULE_DEVICE_TABLE(pci, loongson_dwmac_id_table);
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
index 8105ce47c6ad..d6939eb9a0d8 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
@@ -420,6 +420,12 @@ stmmac_ethtool_set_link_ksettings(struct net_device *dev,
 		return 0;
 	}
 
+	if (FIELD_GET(STMMAC_FLAG_DISABLE_FORCE_1000, priv->plat->flags)) {
+		if (cmd->base.speed == SPEED_1000 &&
+		    cmd->base.autoneg != AUTONEG_ENABLE)
+			return -EOPNOTSUPP;
+	}
+
 	return phylink_ethtool_ksettings_set(priv->phylink, cmd);
 }
 
diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h
index f07f79d50b06..067030cdb60f 100644
--- a/include/linux/stmmac.h
+++ b/include/linux/stmmac.h
@@ -222,6 +222,8 @@ struct dwmac4_addrs {
 #define STMMAC_FLAG_EN_TX_LPI_CLOCKGATING	BIT(11)
 #define STMMAC_FLAG_HWTSTAMP_CORRECT_LATENCY	BIT(12)
 #define STMMAC_FLAG_HAS_LGMAC			BIT(13)
+#define STMMAC_FLAG_DISABLE_HALF_DUPLEX	BIT(14)
+#define STMMAC_FLAG_DISABLE_FORCE_1000	BIT(15)
 
 struct plat_stmmacenet_data {
 	int bus_id;
-- 
2.31.4