r8169: add support for RTL8126A

This adds support for the RTL8126A found on Asus z790 Maximus Formula.
It was successfully tested w/o the firmware at 1000Mbps. Firmware file
has been provided by Realtek and submitted to linux-firmware.
2.5G and 5G modes are untested.

Signed-off-by: Heiner Kallweit <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/ethernet/realtek/r8169.h

···
 	/* support for RTL_GIGA_MAC_VER_60 has been removed */
 	RTL_GIGA_MAC_VER_61,
 	RTL_GIGA_MAC_VER_63,
+	RTL_GIGA_MAC_VER_65,
 	RTL_GIGA_MAC_NONE
 };
 

drivers/net/ethernet/realtek/r8169_main.c

···
 #define FIRMWARE_8107E_2	"rtl_nic/rtl8107e-2.fw"
 #define FIRMWARE_8125A_3	"rtl_nic/rtl8125a-3.fw"
 #define FIRMWARE_8125B_2	"rtl_nic/rtl8125b-2.fw"
+#define FIRMWARE_8126A_2	"rtl_nic/rtl8126a-2.fw"
 
 #define TX_DMA_BURST	7	/* Maximum PCI burst, '7' is unlimited */
 #define InterFrameGap	0x03	/* 3 means InterFrameGap = the shortest one */
···
 	[RTL_GIGA_MAC_VER_61] = {"RTL8125A",		FIRMWARE_8125A_3},
 	/* reserve 62 for CFG_METHOD_4 in the vendor driver */
 	[RTL_GIGA_MAC_VER_63] = {"RTL8125B",		FIRMWARE_8125B_2},
+	[RTL_GIGA_MAC_VER_65] = {"RTL8126A",		FIRMWARE_8126A_2},
 };
 
 static const struct pci_device_id rtl8169_pci_tbl[] = {
···
 	{ PCI_VENDOR_ID_LINKSYS, 0x1032, PCI_ANY_ID, 0x0024 },
 	{ 0x0001, 0x8168, PCI_ANY_ID, 0x2410 },
 	{ PCI_VDEVICE(REALTEK,	0x8125) },
+	{ PCI_VDEVICE(REALTEK,	0x8126) },
 	{ PCI_VDEVICE(REALTEK,	0x3000) },
 	{}
 };
···
 };
 
 enum rtl8125_registers {
+	INT_CFG0_8125		= 0x34,
+#define INT_CFG0_ENABLE_8125		BIT(0)
+#define INT_CFG0_CLKREQEN		BIT(3)
 	IntrMask_8125		= 0x38,
 	IntrStatus_8125		= 0x3c,
+	INT_CFG1_8125		= 0x7a,
 	TxPoll_8125		= 0x90,
 	MAC0_BKP		= 0x19e0,
 	EEE_TXIDLE_TIMER_8125	= 0x6048,
···
 	case RTL_GIGA_MAC_VER_31:
 		r8168dp_2_mdio_write(tp, location, val);
 		break;
-	case RTL_GIGA_MAC_VER_40 ... RTL_GIGA_MAC_VER_63:
+	case RTL_GIGA_MAC_VER_40 ... RTL_GIGA_MAC_VER_65:
 		r8168g_mdio_write(tp, location, val);
 		break;
 	default:
···
 	case RTL_GIGA_MAC_VER_28:
 	case RTL_GIGA_MAC_VER_31:
 		return r8168dp_2_mdio_read(tp, location);
-	case RTL_GIGA_MAC_VER_40 ... RTL_GIGA_MAC_VER_63:
+	case RTL_GIGA_MAC_VER_40 ... RTL_GIGA_MAC_VER_65:
 		return r8168g_mdio_read(tp, location);
 	default:
 		return r8169_mdio_read(tp, location);
···
 	case RTL_GIGA_MAC_VER_25 ... RTL_GIGA_MAC_VER_26:
 	case RTL_GIGA_MAC_VER_29 ... RTL_GIGA_MAC_VER_30:
 	case RTL_GIGA_MAC_VER_32 ... RTL_GIGA_MAC_VER_37:
-	case RTL_GIGA_MAC_VER_39 ... RTL_GIGA_MAC_VER_63:
+	case RTL_GIGA_MAC_VER_39 ... RTL_GIGA_MAC_VER_65:
 		if (enable)
 			RTL_W8(tp, PMCH, RTL_R8(tp, PMCH) & ~D3_NO_PLL_DOWN);
 		else
···
 		break;
 	case RTL_GIGA_MAC_VER_34:
 	case RTL_GIGA_MAC_VER_37:
-	case RTL_GIGA_MAC_VER_39 ... RTL_GIGA_MAC_VER_63:
+	case RTL_GIGA_MAC_VER_39 ... RTL_GIGA_MAC_VER_65:
 		if (wolopts)
 			rtl_mod_config2(tp, 0, PME_SIGNAL);
 		else
···
 		u16 val;
 		enum mac_version ver;
 	} mac_info[] = {
+		/* 8126A family. */
+		{ 0x7cf, 0x649,	RTL_GIGA_MAC_VER_65 },
+
 		/* 8125B family. */
 		{ 0x7cf, 0x641,	RTL_GIGA_MAC_VER_63 },
 
···
 		RTL_W32(tp, RxConfig, RX_FETCH_DFLT_8125 | RX_DMA_BURST);
 		break;
 	case RTL_GIGA_MAC_VER_63:
+	case RTL_GIGA_MAC_VER_65:
 		RTL_W32(tp, RxConfig, RX_FETCH_DFLT_8125 | RX_DMA_BURST |
 			RX_PAUSE_SLOT_ON);
 		break;
···
 	case RTL_GIGA_MAC_VER_61 ... RTL_GIGA_MAC_VER_61:
 		rtl_loop_wait_high(tp, &rtl_rxtx_empty_cond, 100, 42);
 		break;
-	case RTL_GIGA_MAC_VER_63:
+	case RTL_GIGA_MAC_VER_63 ... RTL_GIGA_MAC_VER_65:
 		RTL_W8(tp, ChipCmd, RTL_R8(tp, ChipCmd) | StopReq);
 		rtl_loop_wait_high(tp, &rtl_rxtx_empty_cond, 100, 42);
 		rtl_loop_wait_high(tp, &rtl_rxtx_empty_cond_2, 100, 42);
···
 	case RTL_GIGA_MAC_VER_37 ... RTL_GIGA_MAC_VER_38:
 		rtl_eri_set_bits(tp, 0xd4, 0x0c00);
 		break;
-	case RTL_GIGA_MAC_VER_40 ... RTL_GIGA_MAC_VER_63:
+	case RTL_GIGA_MAC_VER_40 ... RTL_GIGA_MAC_VER_65:
 		r8168_mac_ocp_modify(tp, 0xc0ac, 0, 0x1f80);
 		break;
 	default:
···
 	case RTL_GIGA_MAC_VER_34 ... RTL_GIGA_MAC_VER_38:
 		rtl_eri_clear_bits(tp, 0xd4, 0x1f00);
 		break;
-	case RTL_GIGA_MAC_VER_40 ... RTL_GIGA_MAC_VER_63:
+	case RTL_GIGA_MAC_VER_40 ... RTL_GIGA_MAC_VER_65:
 		r8168_mac_ocp_modify(tp, 0xc0ac, 0x1f80, 0);
 		break;
 	default:
···
 
 static void rtl_hw_aspm_clkreq_enable(struct rtl8169_private *tp, bool enable)
 {
+	u8 val8;
+
 	if (tp->mac_version < RTL_GIGA_MAC_VER_32)
 		return;
 
···
 			return;
 
 		rtl_mod_config5(tp, 0, ASPM_en);
-		rtl_mod_config2(tp, 0, ClkReqEn);
+		switch (tp->mac_version) {
+		case RTL_GIGA_MAC_VER_65:
+			val8 = RTL_R8(tp, INT_CFG0_8125) | INT_CFG0_CLKREQEN;
+			RTL_W8(tp, INT_CFG0_8125, val8);
+			break;
+		default:
+			rtl_mod_config2(tp, 0, ClkReqEn);
+			break;
+		}
 
 		switch (tp->mac_version) {
 		case RTL_GIGA_MAC_VER_46 ... RTL_GIGA_MAC_VER_48:
-		case RTL_GIGA_MAC_VER_61 ... RTL_GIGA_MAC_VER_63:
+		case RTL_GIGA_MAC_VER_61 ... RTL_GIGA_MAC_VER_65:
 			/* reset ephy tx/rx disable timer */
 			r8168_mac_ocp_modify(tp, 0xe094, 0xff00, 0);
 			/* chip can trigger L1.2 */
···
 	} else {
 		switch (tp->mac_version) {
 		case RTL_GIGA_MAC_VER_46 ... RTL_GIGA_MAC_VER_48:
-		case RTL_GIGA_MAC_VER_61 ... RTL_GIGA_MAC_VER_63:
+		case RTL_GIGA_MAC_VER_61 ... RTL_GIGA_MAC_VER_65:
 			r8168_mac_ocp_modify(tp, 0xe092, 0x00ff, 0);
 			break;
 		default:
 			break;
 		}
 
-		rtl_mod_config2(tp, ClkReqEn, 0);
+		switch (tp->mac_version) {
+		case RTL_GIGA_MAC_VER_65:
+			val8 = RTL_R8(tp, INT_CFG0_8125) & ~INT_CFG0_CLKREQEN;
+			RTL_W8(tp, INT_CFG0_8125, val8);
+			break;
+		default:
+			rtl_mod_config2(tp, ClkReqEn, 0);
+			break;
+		}
 		rtl_mod_config5(tp, ASPM_en, 0);
 	}
 }
···
 	/* disable new tx descriptor format */
 	r8168_mac_ocp_modify(tp, 0xeb58, 0x0001, 0x0000);
 
-	if (tp->mac_version == RTL_GIGA_MAC_VER_63)
+	if (tp->mac_version == RTL_GIGA_MAC_VER_65)
+		RTL_W8(tp, 0xD8, RTL_R8(tp, 0xD8) & ~0x02);
+
+	if (tp->mac_version == RTL_GIGA_MAC_VER_65)
+		r8168_mac_ocp_modify(tp, 0xe614, 0x0700, 0x0400);
+	else if (tp->mac_version == RTL_GIGA_MAC_VER_63)
 		r8168_mac_ocp_modify(tp, 0xe614, 0x0700, 0x0200);
 	else
-		r8168_mac_ocp_modify(tp, 0xe614, 0x0700, 0x0400);
+		r8168_mac_ocp_modify(tp, 0xe614, 0x0700, 0x0300);
 
 	if (tp->mac_version == RTL_GIGA_MAC_VER_63)
 		r8168_mac_ocp_modify(tp, 0xe63e, 0x0c30, 0x0000);
···
 	r8168_mac_ocp_modify(tp, 0xe056, 0x00f0, 0x0030);
 	r8168_mac_ocp_modify(tp, 0xe040, 0x1000, 0x0000);
 	r8168_mac_ocp_modify(tp, 0xea1c, 0x0003, 0x0001);
+	if (tp->mac_version == RTL_GIGA_MAC_VER_65)
+		r8168_mac_ocp_modify(tp, 0xea1c, 0x0300, 0x0000);
+	else
+		r8168_mac_ocp_modify(tp, 0xea1c, 0x0004, 0x0000);
 	r8168_mac_ocp_modify(tp, 0xe0c0, 0x4f0f, 0x4403);
 	r8168_mac_ocp_modify(tp, 0xe052, 0x0080, 0x0068);
 	r8168_mac_ocp_modify(tp, 0xd430, 0x0fff, 0x047f);
···
 
 	rtl_loop_wait_low(tp, &rtl_mac_ocp_e00e_cond, 1000, 10);
 
-	if (tp->mac_version == RTL_GIGA_MAC_VER_63)
-		rtl8125b_config_eee_mac(tp);
-	else
+	if (tp->mac_version == RTL_GIGA_MAC_VER_61)
 		rtl8125a_config_eee_mac(tp);
+	else
+		rtl8125b_config_eee_mac(tp);
 
 	rtl_disable_rxdvgate(tp);
 }
···
 
 	rtl_set_def_aspm_entry_latency(tp);
 	rtl_ephy_init(tp, e_info_8125b);
+	rtl_hw_start_8125_common(tp);
+}
+
+static void rtl_hw_start_8126a(struct rtl8169_private *tp)
+{
+	rtl_set_def_aspm_entry_latency(tp);
 	rtl_hw_start_8125_common(tp);
 }
 
···
 		[RTL_GIGA_MAC_VER_53] = rtl_hw_start_8117,
 		[RTL_GIGA_MAC_VER_61] = rtl_hw_start_8125a_2,
 		[RTL_GIGA_MAC_VER_63] = rtl_hw_start_8125b,
+		[RTL_GIGA_MAC_VER_65] = rtl_hw_start_8126a,
 	};
 
 	if (hw_configs[tp->mac_version])
···
 {
 	int i;
 
+	RTL_W8(tp, INT_CFG0_8125, 0x00);
+
 	/* disable interrupt coalescing */
-	for (i = 0xa00; i < 0xb00; i += 4)
-		RTL_W32(tp, i, 0);
+	switch (tp->mac_version) {
+	case RTL_GIGA_MAC_VER_61:
+		for (i = 0xa00; i < 0xb00; i += 4)
+			RTL_W32(tp, i, 0);
+		break;
+	case RTL_GIGA_MAC_VER_63:
+	case RTL_GIGA_MAC_VER_65:
+		for (i = 0xa00; i < 0xa80; i += 4)
+			RTL_W32(tp, i, 0);
+		RTL_W16(tp, INT_CFG1_8125, 0x0000);
+		break;
+	default:
+		break;
+	}
 
 	rtl_hw_config(tp);
 }
···
 	rtl_jumbo_config(tp);
 
 	switch (tp->mac_version) {
-	case RTL_GIGA_MAC_VER_61:
-	case RTL_GIGA_MAC_VER_63:
+	case RTL_GIGA_MAC_VER_61 ... RTL_GIGA_MAC_VER_65:
 		rtl8125_set_eee_txidle_timer(tp);
 		break;
 	default:
···
 		RTL_W8(tp, ChipCmd, RTL_R8(tp, ChipCmd) | StopReq);
 		rtl_loop_wait_high(tp, &rtl_txcfg_empty_cond, 100, 666);
 		break;
-	case RTL_GIGA_MAC_VER_40 ... RTL_GIGA_MAC_VER_63:
+	case RTL_GIGA_MAC_VER_40 ... RTL_GIGA_MAC_VER_65:
 		rtl_enable_rxdvgate(tp);
 		fsleep(2000);
 		break;
···
 
 	switch (tp->mac_version) {
 	case RTL_GIGA_MAC_VER_34:
-	case RTL_GIGA_MAC_VER_61:
-	case RTL_GIGA_MAC_VER_63:
+	case RTL_GIGA_MAC_VER_61 ... RTL_GIGA_MAC_VER_65:
 		padto = max_t(unsigned int, padto, ETH_ZLEN);
 		break;
 	default:
···
 	case RTL_GIGA_MAC_VER_40 ... RTL_GIGA_MAC_VER_48:
 		rtl_hw_init_8168g(tp);
 		break;
-	case RTL_GIGA_MAC_VER_61 ... RTL_GIGA_MAC_VER_63:
+	case RTL_GIGA_MAC_VER_61 ... RTL_GIGA_MAC_VER_65:
 		rtl_hw_init_8125(tp);
 		break;
 	default:

drivers/net/ethernet/realtek/r8169_phy_config.c

···
 	rtl8125b_config_eee_phy(phydev);
 }
 
+static void rtl8126a_hw_phy_config(struct rtl8169_private *tp,
+				   struct phy_device *phydev)
+{
+	r8169_apply_firmware(tp);
+}
+
 void r8169_hw_phy_config(struct rtl8169_private *tp, struct phy_device *phydev,
 			 enum mac_version ver)
 {
···
 		[RTL_GIGA_MAC_VER_53] = rtl8117_hw_phy_config,
 		[RTL_GIGA_MAC_VER_61] = rtl8125a_2_hw_phy_config,
 		[RTL_GIGA_MAC_VER_63] = rtl8125b_hw_phy_config,
+		[RTL_GIGA_MAC_VER_65] = rtl8126a_hw_phy_config,
 	};
 
 	if (phy_configs[ver])