NET: Add ezchip ethernet driver

Simple LAN device for debug or management purposes.
Device supports interrupts for RX and TX(completion).
Device does not have DMA ability.
Signed-off-by: Noam Camus <noamc@ezchip.com>
Signed-off-by: Tal Zilcer <talz@ezchip.com>
Acked-by: Alexey Brodkin <abrodkin@synopsys.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Documentation/devicetree/bindings/net/ezchip_enet.txt

+* EZchip NPS Management Ethernet port driver
+
+Required properties:
+- compatible: Should be "ezchip,nps-mgt-enet"
+- reg: Address and length of the register set for the device
+- interrupts: Should contain the ENET interrupt
+
+Examples:
+
+	ethernet@f0003000 {
+		compatible = "ezchip,nps-mgt-enet";
+		reg = <0xf0003000 0x44>;
+		interrupts = <7>;
+		mac-address = [ 00 11 22 33 44 55 ];
+	};

drivers/net/ethernet/Kconfig

@@ -67,6 +67,7 @@ config DNET
 source "drivers/net/ethernet/dec/Kconfig"
 source "drivers/net/ethernet/dlink/Kconfig"
 source "drivers/net/ethernet/emulex/Kconfig"
+source "drivers/net/ethernet/ezchip/Kconfig"
 source "drivers/net/ethernet/neterion/Kconfig"
 source "drivers/net/ethernet/faraday/Kconfig"
 source "drivers/net/ethernet/freescale/Kconfig"

drivers/net/ethernet/Makefile

@@ -30,6 +30,7 @@ obj-$(CONFIG_DNET) += dnet.o
 obj-$(CONFIG_NET_VENDOR_DEC) += dec/
 obj-$(CONFIG_NET_VENDOR_DLINK) += dlink/
 obj-$(CONFIG_NET_VENDOR_EMULEX) += emulex/
+obj-$(CONFIG_NET_VENDOR_EZCHIP) += ezchip/
 obj-$(CONFIG_NET_VENDOR_EXAR) += neterion/
 obj-$(CONFIG_NET_VENDOR_FARADAY) += faraday/
 obj-$(CONFIG_NET_VENDOR_FREESCALE) += freescale/

drivers/net/ethernet/ezchip/Kconfig

+#
+# EZchip network device configuration
+#
+
+config NET_VENDOR_EZCHIP
+	bool "EZchip devices"
+	default y
+	---help---
+	  If you have a network (Ethernet) device belonging to this class, say Y.
+
+	  Note that the answer to this question doesn't directly affect the
+	  kernel: saying N will just cause the configurator to skip all
+	  the questions about EZchip devices. If you say Y, you will be asked for
+	  your specific device in the following questions.
+
+if NET_VENDOR_EZCHIP
+
+config EZCHIP_NPS_MANAGEMENT_ENET
+	tristate "EZchip NPS management enet support"
+	depends on OF_IRQ && OF_NET
+	---help---
+	  Simple LAN device for debug or management purposes.
+	  Device supports interrupts for RX and TX(completion).
+	  Device does not have DMA ability.
+
+endif

drivers/net/ethernet/ezchip/Makefile

+obj-$(CONFIG_EZCHIP_NPS_MANAGEMENT_ENET) += nps_enet.o

drivers/net/ethernet/ezchip/nps_enet.h

+/*
+ * Copyright(c) 2015 EZchip Technologies.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * The full GNU General Public License is included in this distribution in
+ * the file called "COPYING".
+ */
+
+#ifndef _NPS_ENET_H
+#define _NPS_ENET_H
+
+/* default values */
+#define NPS_ENET_NAPI_POLL_WEIGHT		0x2
+#define NPS_ENET_MAX_FRAME_LENGTH		0x3FFF
+#define NPS_ENET_GE_MAC_CFG_0_TX_FC_RETR	0x7
+#define NPS_ENET_GE_MAC_CFG_0_RX_IFG		0x5
+#define NPS_ENET_GE_MAC_CFG_0_TX_IFG		0xC
+#define NPS_ENET_GE_MAC_CFG_0_TX_PR_LEN		0x7
+#define NPS_ENET_GE_MAC_CFG_2_STAT_EN		0x3
+#define NPS_ENET_GE_MAC_CFG_3_RX_IFG_TH		0x14
+#define NPS_ENET_GE_MAC_CFG_3_MAX_LEN		0x3FFC
+#define NPS_ENET_ENABLE				1
+#define NPS_ENET_DISABLE			0
+
+/* register definitions  */
+#define NPS_ENET_REG_TX_CTL		0x800
+#define NPS_ENET_REG_TX_BUF		0x808
+#define NPS_ENET_REG_RX_CTL		0x810
+#define NPS_ENET_REG_RX_BUF		0x818
+#define NPS_ENET_REG_BUF_INT_ENABLE	0x8C0
+#define NPS_ENET_REG_BUF_INT_CAUSE	0x8C4
+#define NPS_ENET_REG_GE_MAC_CFG_0	0x1000
+#define NPS_ENET_REG_GE_MAC_CFG_1	0x1004
+#define NPS_ENET_REG_GE_MAC_CFG_2	0x1008
+#define NPS_ENET_REG_GE_MAC_CFG_3	0x100C
+#define NPS_ENET_REG_GE_RST		0x1400
+#define NPS_ENET_REG_PHASE_FIFO_CTL	0x1404
+
+/* Tx control register */
+struct nps_enet_tx_ctl {
+	union {
+		/* ct: SW sets to indicate frame ready in Tx buffer for
+		 *     transmission. HW resets to when transmission done
+		 * et: Transmit error
+		 * nt: Length in bytes of Tx frame loaded to Tx buffer
+		 */
+		struct {
+			u32
+			__reserved_1:16,
+			ct:1,
+			et:1,
+			__reserved_2:3,
+			nt:11;
+		};
+
+		u32 value;
+	};
+};
+
+/* Rx control register */
+struct nps_enet_rx_ctl {
+	union {
+		/* cr:  HW sets to indicate frame ready in Rx buffer.
+		 *      SW resets to indicate host read received frame
+		 *      and new frames can be written to Rx buffer
+		 * er:  Rx error indication
+		 * crc: Rx CRC error indication
+		 * nr:  Length in bytes of Rx frame loaded by MAC to Rx buffer
+		 */
+		struct {
+			u32
+			__reserved_1:16,
+			cr:1,
+			er:1,
+			crc:1,
+			__reserved_2:2,
+			nr:11;
+		};
+
+		u32 value;
+	};
+};
+
+/* Interrupt enable for data buffer events register */
+struct nps_enet_buf_int_enable {
+	union {
+		/* tx_done: Interrupt generation in the case when new frame
+		 *          is ready in Rx buffer
+		 * rx_rdy:  Interrupt generation in the case when current frame
+		 *          was read from TX buffer
+		 */
+		struct {
+			u32
+			__reserved:30,
+			tx_done:1,
+			rx_rdy:1;
+		};
+
+		u32 value;
+	};
+};
+
+/* Interrupt cause for data buffer events register */
+struct nps_enet_buf_int_cause {
+	union {
+		/* tx_done: Interrupt in the case when current frame was
+		 *          read from TX buffer.
+		 * rx_rdy:  Interrupt in the case when new frame is ready
+		 *          in RX buffer.
+		 */
+		struct {
+			u32
+			__reserved:30,
+			tx_done:1,
+			rx_rdy:1;
+		};
+
+		u32 value;
+	};
+};
+
+/* Gbps Eth MAC Configuration 0 register */
+struct nps_enet_ge_mac_cfg_0 {
+	union {
+		/* tx_pr_len:          Transmit preamble length in bytes
+		 * tx_ifg_nib:         Tx idle pattern
+		 * nib_mode:           Nibble (4-bit) Mode
+		 * rx_pr_check_en:     Receive preamble Check Enable
+		 * tx_ifg:             Transmit inter-Frame Gap
+		 * rx_ifg:             Receive inter-Frame Gap
+		 * tx_fc_retr:         Transmit Flow Control Retransmit Mode
+		 * rx_length_check_en: Receive Length Check Enable
+		 * rx_crc_ignore:      Results of the CRC check are ignored
+		 * rx_crc_strip:       MAC strips the CRC from received frames
+		 * rx_fc_en:           Receive Flow Control Enable
+		 * tx_crc_en:          Transmit CRC Enabled
+		 * tx_pad_en:          Transmit Padding Enable
+		 * tx_cf_en:           Transmit Flow Control Enable
+		 * tx_en:              Transmit Enable
+		 * rx_en:              Receive Enable
+		 */
+		struct {
+			u32
+			tx_pr_len:4,
+			tx_ifg_nib:4,
+			nib_mode:1,
+			rx_pr_check_en:1,
+			tx_ifg:6,
+			rx_ifg:4,
+			tx_fc_retr:3,
+			rx_length_check_en:1,
+			rx_crc_ignore:1,
+			rx_crc_strip:1,
+			rx_fc_en:1,
+			tx_crc_en:1,
+			tx_pad_en:1,
+			tx_fc_en:1,
+			tx_en:1,
+			rx_en:1;
+		};
+
+		u32 value;
+	};
+};
+
+/* Gbps Eth MAC Configuration 1 register */
+struct nps_enet_ge_mac_cfg_1 {
+	union {
+		/* octet_3: MAC address octet 3
+		 * octet_2: MAC address octet 2
+		 * octet_1: MAC address octet 1
+		 * octet_0: MAC address octet 0
+		 */
+		struct {
+			u32
+			octet_3:8,
+			octet_2:8,
+			octet_1:8,
+			octet_0:8;
+		};
+
+		u32 value;
+	};
+};
+
+/* Gbps Eth MAC Configuration 2 register */
+struct nps_enet_ge_mac_cfg_2 {
+	union {
+		/* transmit_flush_en: MAC flush enable
+		 * stat_en:           RMON statistics interface enable
+		 * disc_da:           Discard frames with DA different
+		 *                    from MAC address
+		 * disc_bc:           Discard broadcast frames
+		 * disc_mc:           Discard multicast frames
+		 * octet_5:           MAC address octet 5
+		 * octet_4:           MAC address octet 4
+		 */
+		struct {
+			u32
+			transmit_flush_en:1,
+			__reserved_1:5,
+			stat_en:2,
+			__reserved_2:1,
+			disc_da:1,
+			disc_bc:1,
+			disc_mc:1,
+			__reserved_3:4,
+			octet_5:8,
+			octet_4:8;
+		};
+
+		u32 value;
+	};
+};
+
+/* Gbps Eth MAC Configuration 3 register */
+struct nps_enet_ge_mac_cfg_3 {
+	union {
+		/* ext_oob_cbfc_sel:  Selects one of the 4 profiles for
+		 *                    extended OOB in-flow-control indication
+		 * max_len:           Maximum receive frame length in bytes
+		 * tx_cbfc_en:        Enable transmission of class-based
+		 *                    flow control packets
+		 * rx_ifg_th:         Threshold for IFG status reporting via OOB
+		 * cf_timeout:        Configurable time to decrement FC counters
+		 * cf_drop:           Drop control frames
+		 * redirect_cbfc_sel: Selects one of CBFC redirect profiles
+		 * rx_cbfc_redir_en:  Enable Rx class-based flow
+		 *                    control redirect
+		 * rx_cbfc_en:        Enable Rx class-based flow control
+		 * tm_hd_mode:        TM header mode
+		 */
+		struct {
+			u32
+			ext_oob_cbfc_sel:2,
+			max_len:14,
+			tx_cbfc_en:1,
+			rx_ifg_th:5,
+			cf_timeout:4,
+			cf_drop:1,
+			redirect_cbfc_sel:2,
+			rx_cbfc_redir_en:1,
+			rx_cbfc_en:1,
+			tm_hd_mode:1;
+		};
+
+		u32 value;
+	};
+};
+
+/* GE MAC, PCS reset control register */
+struct nps_enet_ge_rst {
+	union {
+		/* gmac_0: GE MAC reset
+		 * spcs_0: SGMII PCS reset
+		 */
+		struct {
+			u32
+			__reserved_1:23,
+			gmac_0:1,
+			__reserved_2:7,
+			spcs_0:1;
+		};
+
+		u32 value;
+	};
+};
+
+/* Tx phase sync FIFO control register */
+struct nps_enet_phase_fifo_ctl {
+	union {
+		/* init: initialize serdes TX phase sync FIFO pointers
+		 * rst:  reset serdes TX phase sync FIFO
+		 */
+		struct {
+			u32
+			__reserved:30,
+			init:1,
+			rst:1;
+		};
+
+		u32 value;
+	};
+};
+
+/**
+ * struct nps_enet_priv - Storage of ENET's private information.
+ * @regs_base:      Base address of ENET memory-mapped control registers.
+ * @irq:            For RX/TX IRQ number.
+ * @tx_packet_sent: SW indication if frame is being sent.
+ * @tx_skb:         socket buffer of sent frame.
+ * @napi:           Structure for NAPI.
+ */
+struct nps_enet_priv {
+	void __iomem *regs_base;
+	s32 irq;
+	bool tx_packet_sent;
+	struct sk_buff *tx_skb;
+	struct napi_struct napi;
+	struct nps_enet_ge_mac_cfg_2 ge_mac_cfg_2;
+	struct nps_enet_ge_mac_cfg_3 ge_mac_cfg_3;
+};
+
+/**
+ * nps_reg_set - Sets ENET register with provided value.
+ * @priv:       Pointer to EZchip ENET private data structure.
+ * @reg:        Register offset from base address.
+ * @value:      Value to set in register.
+ */
+static inline void nps_enet_reg_set(struct nps_enet_priv *priv,
+				    s32 reg, s32 value)
+{
+	iowrite32be(value, priv->regs_base + reg);
+}
+
+/**
+ * nps_reg_get - Gets value of specified ENET register.
+ * @priv:       Pointer to EZchip ENET private data structure.
+ * @reg:        Register offset from base address.
+ *
+ * returns:     Value of requested register.
+ */
+static inline u32 nps_enet_reg_get(struct nps_enet_priv *priv, s32 reg)
+{
+	return ioread32be(priv->regs_base + reg);
+}
+
+#endif /* _NPS_ENET_H */