net: enetc: add preliminary support for i.MX95 ENETC PF

The i.MX95 ENETC has been upgraded to revision 4.1, which is different
from the LS1028A ENETC (revision 1.0) except for the SI part. Therefore,
the fsl-enetc driver is incompatible with i.MX95 ENETC PF. So add new
nxp-enetc4 driver to support i.MX95 ENETC PF, and this driver will be
used to support the ENETC PF with major revision 4 for other SoCs in the
future.

Currently, the nxp-enetc4 driver only supports basic transmission feature
for i.MX95 ENETC PF, the more basic and advanced features will be added
in the subsequent patches. In addition, PCS support has not been added
yet, so 10G ENETC (ENETC instance 2) is not supported now.

Signed-off-by: Wei Fang <wei.fang@nxp.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Author: Wei Fang

drivers/net/ethernet/freescale/enetc/Kconfig

@@ -33,6 +33,23 @@ config FSL_ENETC
 
 	  If compiled as module (M), the module name is fsl-enetc.
 
+config NXP_ENETC4
+	tristate "ENETC4 PF driver"
+	depends on PCI_MSI
+	select MDIO_DEVRES
+	select FSL_ENETC_CORE
+	select FSL_ENETC_MDIO
+	select NXP_ENETC_PF_COMMON
+	select PHYLINK
+	select DIMLIB
+	help
+	  This driver supports NXP ENETC devices with major revision 4. ENETC is
+	  as the NIC functionality in NETC, it supports virtualization/isolation
+	  based on PCIe Single Root IO Virtualization (SR-IOV) and a full range
+	  of TSN standards and NIC offload capabilities.
+
+	  If compiled as module (M), the module name is nxp-enetc4.
+
 config FSL_ENETC_VF
 	tristate "ENETC VF driver"
 	depends on PCI_MSI

drivers/net/ethernet/freescale/enetc/Makefile

@@ -11,6 +11,9 @@ fsl-enetc-y := enetc_pf.o
 fsl-enetc-$(CONFIG_PCI_IOV) += enetc_msg.o
 fsl-enetc-$(CONFIG_FSL_ENETC_QOS) += enetc_qos.o
 
+obj-$(CONFIG_NXP_ENETC4) += nxp-enetc4.o
+nxp-enetc4-y := enetc4_pf.o
+
 obj-$(CONFIG_FSL_ENETC_VF) += fsl-enetc-vf.o
 fsl-enetc-vf-y := enetc_vf.o
 

drivers/net/ethernet/freescale/enetc/enetc.c

@@ -3,6 +3,7 @@
 
 #include "enetc.h"
 #include <linux/bpf_trace.h>
+#include <linux/clk.h>
 #include <linux/tcp.h>
 #include <linux/udp.h>
 #include <linux/vmalloc.h>
@@ -21,7 +22,7 @@ void enetc_port_mac_wr(struct enetc_si *si, u32 reg, u32 val)
 {
 	enetc_port_wr(&si->hw, reg, val);
 	if (si->hw_features & ENETC_SI_F_QBU)
-		enetc_port_wr(&si->hw, reg + ENETC_PMAC_OFFSET, val);
+		enetc_port_wr(&si->hw, reg + si->drvdata->pmac_offset, val);
 }
 EXPORT_SYMBOL_GPL(enetc_port_mac_wr);
 
@@ -700,8 +701,9 @@ static void enetc_rx_dim_work(struct work_struct *w)
 		net_dim_get_rx_moderation(dim->mode, dim->profile_ix);
 	struct enetc_int_vector	*v =
 		container_of(dim, struct enetc_int_vector, rx_dim);
+	struct enetc_ndev_priv *priv = netdev_priv(v->rx_ring.ndev);
 
-	v->rx_ictt = enetc_usecs_to_cycles(moder.usec);
+	v->rx_ictt = enetc_usecs_to_cycles(moder.usec, priv->sysclk_freq);
 	dim->state = DIM_START_MEASURE;
 }
 
@@ -1736,9 +1738,15 @@ void enetc_get_si_caps(struct enetc_si *si)
 	si->num_rx_rings = (val >> 16) & 0xff;
 	si->num_tx_rings = val & 0xff;
 
-	val = enetc_rd(hw, ENETC_SIRFSCAPR);
-	si->num_fs_entries = ENETC_SIRFSCAPR_GET_NUM_RFS(val);
-	si->num_fs_entries = min(si->num_fs_entries, ENETC_MAX_RFS_SIZE);
+	val = enetc_rd(hw, ENETC_SIPCAPR0);
+	if (val & ENETC_SIPCAPR0_RFS) {
+		val = enetc_rd(hw, ENETC_SIRFSCAPR);
+		si->num_fs_entries = ENETC_SIRFSCAPR_GET_NUM_RFS(val);
+		si->num_fs_entries = min(si->num_fs_entries, ENETC_MAX_RFS_SIZE);
+	} else {
+		/* ENETC which not supports RFS */
+		si->num_fs_entries = 0;
+	}
 
 	si->num_rss = 0;
 	val = enetc_rd(hw, ENETC_SIPCAPR0);
@@ -2066,7 +2074,10 @@ int enetc_configure_si(struct enetc_ndev_priv *priv)
 	/* enable SI */
 	enetc_wr(hw, ENETC_SIMR, ENETC_SIMR_EN);
 
-	if (si->num_rss) {
+	/* TODO: RSS support for i.MX95 will be supported later, and the
+	 * is_enetc_rev1() condition will be removed
+	 */
+	if (si->num_rss && is_enetc_rev1(si)) {
 		err = enetc_setup_default_rss_table(si, priv->num_rx_rings);
 		if (err)
 			return err;
@@ -2090,9 +2101,9 @@ void enetc_init_si_rings_params(struct enetc_ndev_priv *priv)
 	 */
 	priv->num_rx_rings = min_t(int, cpus, si->num_rx_rings);
 	priv->num_tx_rings = si->num_tx_rings;
-	priv->bdr_int_num = cpus;
+	priv->bdr_int_num = priv->num_rx_rings;
 	priv->ic_mode = ENETC_IC_RX_ADAPTIVE | ENETC_IC_TX_MANUAL;
-	priv->tx_ictt = ENETC_TXIC_TIMETHR;
+	priv->tx_ictt = enetc_usecs_to_cycles(600, priv->sysclk_freq);
 }
 EXPORT_SYMBOL_GPL(enetc_init_si_rings_params);
 
@@ -2501,10 +2512,14 @@ int enetc_open(struct net_device *ndev)
 
 	extended = !!(priv->active_offloads & ENETC_F_RX_TSTAMP);
 
-	err = enetc_setup_irqs(priv);
+	err = clk_prepare_enable(priv->ref_clk);
 	if (err)
 		return err;
 
+	err = enetc_setup_irqs(priv);
+	if (err)
+		goto err_setup_irqs;
+
 	err = enetc_phylink_connect(ndev);
 	if (err)
 		goto err_phy_connect;
@@ -2536,6 +2551,8 @@ int enetc_open(struct net_device *ndev)
 		phylink_disconnect_phy(priv->phylink);
 err_phy_connect:
 	enetc_free_irqs(priv);
+err_setup_irqs:
+	clk_disable_unprepare(priv->ref_clk);
 
 	return err;
 }
@@ -2589,6 +2606,7 @@ int enetc_close(struct net_device *ndev)
 	enetc_assign_tx_resources(priv, NULL);
 
 	enetc_free_irqs(priv);
+	clk_disable_unprepare(priv->ref_clk);
 
 	return 0;
 }
@@ -3254,5 +3272,55 @@ void enetc_pci_remove(struct pci_dev *pdev)
 }
 EXPORT_SYMBOL_GPL(enetc_pci_remove);
 
+static const struct enetc_drvdata enetc_pf_data = {
+	.sysclk_freq = ENETC_CLK_400M,
+	.pmac_offset = ENETC_PMAC_OFFSET,
+	.eth_ops = &enetc_pf_ethtool_ops,
+};
+
+static const struct enetc_drvdata enetc4_pf_data = {
+	.sysclk_freq = ENETC_CLK_333M,
+	.pmac_offset = ENETC4_PMAC_OFFSET,
+	.eth_ops = &enetc4_pf_ethtool_ops,
+};
+
+static const struct enetc_drvdata enetc_vf_data = {
+	.sysclk_freq = ENETC_CLK_400M,
+	.eth_ops = &enetc_vf_ethtool_ops,
+};
+
+static const struct enetc_platform_info enetc_info[] = {
+	{ .revision = ENETC_REV_1_0,
+	  .dev_id = ENETC_DEV_ID_PF,
+	  .data = &enetc_pf_data,
+	},
+	{ .revision = ENETC_REV_4_1,
+	  .dev_id = NXP_ENETC_PF_DEV_ID,
+	  .data = &enetc4_pf_data,
+	},
+	{ .revision = ENETC_REV_1_0,
+	  .dev_id = ENETC_DEV_ID_VF,
+	  .data = &enetc_vf_data,
+	},
+};
+
+int enetc_get_driver_data(struct enetc_si *si)
+{
+	u16 dev_id = si->pdev->device;
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(enetc_info); i++) {
+		if (si->revision == enetc_info[i].revision &&
+		    dev_id == enetc_info[i].dev_id) {
+			si->drvdata = enetc_info[i].data;
+
+			return 0;
+		}
+	}
+
+	return -ERANGE;
+}
+EXPORT_SYMBOL_GPL(enetc_get_driver_data);
+
 MODULE_DESCRIPTION("NXP ENETC Ethernet driver");
 MODULE_LICENSE("Dual BSD/GPL");

drivers/net/ethernet/freescale/enetc/enetc.h

@@ -14,6 +14,7 @@
 #include <net/xdp.h>
 
 #include "enetc_hw.h"
+#include "enetc4_hw.h"
 
 #define ENETC_MAC_MAXFRM_SIZE	9600
 #define ENETC_MAX_MTU		(ENETC_MAC_MAXFRM_SIZE - \
@@ -231,6 +232,18 @@ enum enetc_errata {
 #define ENETC_SI_F_QBV  BIT(1)
 #define ENETC_SI_F_QBU  BIT(2)
 
+struct enetc_drvdata {
+	u32 pmac_offset; /* Only valid for PSI which supports 802.1Qbu */
+	u64 sysclk_freq;
+	const struct ethtool_ops *eth_ops;
+};
+
+struct enetc_platform_info {
+	u16 revision;
+	u16 dev_id;
+	const struct enetc_drvdata *data;
+};
+
 /* PCI IEP device data */
 struct enetc_si {
 	struct pci_dev *pdev;
@@ -246,11 +259,18 @@ struct enetc_si {
 	int num_fs_entries;
 	int num_rss; /* number of RSS buckets */
 	unsigned short pad;
+	u16 revision;
 	int hw_features;
+	const struct enetc_drvdata *drvdata;
 };
 
 #define ENETC_SI_ALIGN	32
 
+static inline bool is_enetc_rev1(struct enetc_si *si)
+{
+	return si->pdev->revision == ENETC_REV1;
+}
+
 static inline void *enetc_si_priv(const struct enetc_si *si)
 {
 	return (char *)si + ALIGN(sizeof(struct enetc_si), ENETC_SI_ALIGN);
@@ -302,7 +322,7 @@ struct enetc_cls_rule {
 	int used;
 };
 
-#define ENETC_MAX_BDR_INT	2 /* fixed to max # of available cpus */
+#define ENETC_MAX_BDR_INT	6 /* fixed to max # of available cpus */
 struct psfp_cap {
 	u32 max_streamid;
 	u32 max_psfp_filter;
@@ -341,7 +361,6 @@ enum enetc_ic_mode {
 
 #define ENETC_RXIC_PKTTHR	min_t(u32, 256, ENETC_RX_RING_DEFAULT_SIZE / 2)
 #define ENETC_TXIC_PKTTHR	min_t(u32, 128, ENETC_TX_RING_DEFAULT_SIZE / 2)
-#define ENETC_TXIC_TIMETHR	enetc_usecs_to_cycles(600)
 
 struct enetc_ndev_priv {
 	struct net_device *ndev;
@@ -389,6 +408,9 @@ struct enetc_ndev_priv {
 	 * and link state updates
 	 */
 	struct mutex		mm_lock;
+
+	struct clk *ref_clk; /* RGMII/RMII reference clock */
+	u64 sysclk_freq; /* NETC system clock frequency */
 };
 
 /* Messaging */
@@ -418,6 +440,7 @@ void enetc_init_si_rings_params(struct enetc_ndev_priv *priv);
 int enetc_alloc_si_resources(struct enetc_ndev_priv *priv);
 void enetc_free_si_resources(struct enetc_ndev_priv *priv);
 int enetc_configure_si(struct enetc_ndev_priv *priv);
+int enetc_get_driver_data(struct enetc_si *si);
 
 int enetc_open(struct net_device *ndev);
 int enetc_close(struct net_device *ndev);
@@ -434,6 +457,9 @@ int enetc_xdp_xmit(struct net_device *ndev, int num_frames,
 		   struct xdp_frame **frames, u32 flags);
 
 /* ethtool */
+extern const struct ethtool_ops enetc_pf_ethtool_ops;
+extern const struct ethtool_ops enetc4_pf_ethtool_ops;
+extern const struct ethtool_ops enetc_vf_ethtool_ops;
 void enetc_set_ethtool_ops(struct net_device *ndev);
 void enetc_mm_link_state_update(struct enetc_ndev_priv *priv, bool link);
 void enetc_mm_commit_preemptible_tcs(struct enetc_ndev_priv *priv);