From patchwork Wed Aug 25 22:21:05 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Joel Stanley X-Patchwork-Id: 502314 Delivered-To: patch@linaro.org Received: by 2002:a02:6f15:0:0:0:0:0 with SMTP id x21csp1020527jab; Wed, 25 Aug 2021 15:21:30 -0700 (PDT) X-Google-Smtp-Source: ABdhPJyl8OZeaTRxlXCZSolWXzMeFb9f5kM9tL93nV6Yrmkxlj73j5Ku71OinaxIHHfiyOwmFU0I X-Received: by 2002:aa7:c0c6:: with SMTP id j6mr820365edp.146.1629930090827; Wed, 25 Aug 2021 15:21:30 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1629930090; cv=none; d=google.com; s=arc-20160816; b=d67gz8vUVjSrTb9lktfyra4CLes3F76+9ujEW+oSapZK0cEwaDHKs9Cwdpisj6I6oX be/2LcfqE/X/b1y2wtOY58NR5/Gb3FSksUm5NQIm4lewjH4Bt8mC8D3/ZZujZJlsxKib wc88pWa4d6o1RA5sFC9fQrUrCU/uwYGdPIYQsVEl4lR5A90TC3TUJcm2UL4Dgr532A7F z2VrqIaplaqH3kHDUavlgfJkLTpzIbOSf3lYC47ihe9r4YxlwP1FaI4jdPhdhQdPXNjr j1LfqPa6uGCC5mQKR3pyxZtk8S62T7IAHJYkru8uJkgHwQFh4yFztpb1VqmiwMaIor/P e3Sw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from:sender :dkim-signature; bh=QoJgSL4P/50e8d1qyRlkjXL/xWvFyxNHJu1MeShhwG4=; b=iw8zzcVu+2N/uo3/M995om8jrCB0+LTHK6q2BzxLch85BdrX0YXR8IzuHNNuYcIPBq Vd1cibU6GZlnFjSuBjyxv89sViQYDAxBjhobBOCmYmvt9eMgPDOT7YiLjbZy7fxMMSDB hDkq9JtdsHo/gvr592Siz/f2a3vbL/CmjX5ybvtL6Ok9qP5JAgl/NBF7cJzu5COHogN5 15RMWLOb+Y/lFlVPVfYE4LDzZuDW7vStyfb91F25MTx7Hzw5Kx8BRm1bqkGOS7/UxP1X CBTypip1r0caT8RaxFYraXsc2u05YDSqCceE4Ftwtyx28/7ViRQZlAKqsHbGMXElNIdV 4FhQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=Z7T7L1BQ; spf=pass (google.com: domain of devicetree-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=devicetree-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id q1si917502ejr.43.2021.08.25.15.21.30; Wed, 25 Aug 2021 15:21:30 -0700 (PDT) Received-SPF: pass (google.com: domain of devicetree-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=Z7T7L1BQ; spf=pass (google.com: domain of devicetree-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=devicetree-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232539AbhHYWWP (ORCPT + 7 others); Wed, 25 Aug 2021 18:22:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37156 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232718AbhHYWWO (ORCPT ); Wed, 25 Aug 2021 18:22:14 -0400 Received: from mail-pl1-x62d.google.com (mail-pl1-x62d.google.com [IPv6:2607:f8b0:4864:20::62d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1D8E0C06179A; Wed, 25 Aug 2021 15:21:26 -0700 (PDT) Received: by mail-pl1-x62d.google.com with SMTP id c4so433436plh.7; Wed, 25 Aug 2021 15:21:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=QoJgSL4P/50e8d1qyRlkjXL/xWvFyxNHJu1MeShhwG4=; b=Z7T7L1BQlCVqXuDAeBmRXzgJxUFxP0i2XRNTAo5ad9NIqLP0mtlikU5wEfDQNUwb9Z FDt2H1u5rqWhRD/OZqYNMxm9AFf5pbmUpb1j9SnleNoJ0mrrwdZZCvzoZ5mXEEFxlZoy 4ptGwoDNoJuGFjMQaM+/W+FnYuRcAV/o2s53iU0RUM32THHA6UCs6p1wJ9rvqhpQ71ad RSfNxsakWT3Y5faSD4i1cT9zfPnIRZEaiuTIPl5K6W5VEMwMbxG1/uLhkULEjB0Idr93 XMJDXqAATWR9u3lEJDFgckIuajgeSFySd9Htfj62gFf5NqNqmLMaW3O8DDoMQbqGdjDN C3uQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:from:to:cc:subject:date:message-id :in-reply-to:references:mime-version:content-transfer-encoding; bh=QoJgSL4P/50e8d1qyRlkjXL/xWvFyxNHJu1MeShhwG4=; b=SpbQ/TzARun3rXFSwwYriiYjp1n1sTbiG8FByIIOfriwMHc/0YK2kdli0AIFIOvfAp tGZF1F1A9bU830wtJFTkuV3QVo4T+e6hMAk03/GzhewLFMCs4elF1vRqlHNKWgV3sYZL 7il/6FsuEu4q2EKmQ6QBzt4OESwFZHYKuaRgzrmmYeJRVqImEHUOBZ205yf9DnhhBc/j f9YFx5AJXnbFvd3IH/lWkIC01qJEgnS1gsvGWgBk1djwwg6q48nlJL9kKjjlHJfDB+IM MhC55eS47OYX6dCSwlhprc6GKeSIfmpN7SSIcOvuesvbLy0e8uPM+jCDHTWT6pRXl75D +qAw== X-Gm-Message-State: AOAM5305nQS69uQLbFTsybb1sbYEfxL+mjvUhuqd3poa5FOS5dC+XSP4 FNSUq6KX2LJ+rSeulC16j9NouK+dtlI= X-Received: by 2002:a17:90a:ab94:: with SMTP id n20mr13090592pjq.146.1629930085424; Wed, 25 Aug 2021 15:21:25 -0700 (PDT) Received: from localhost.localdomain ([45.124.203.15]) by smtp.gmail.com with ESMTPSA id t18sm616227pfg.111.2021.08.25.15.21.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 25 Aug 2021 15:21:24 -0700 (PDT) Sender: "joel.stan@gmail.com" From: Joel Stanley To: "David S . Miller" , Jakub Kicinski , Rob Herring Cc: Karol Gugala , Mateusz Holenko , devicetree@vger.kernel.org, Florent Kermarrec , "Gabriel L . Somlo" , netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v4 1/2] dt-bindings: net: Add bindings for LiteETH Date: Thu, 26 Aug 2021 07:51:05 +0930 Message-Id: <20210825222106.3113287-2-joel@jms.id.au> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210825222106.3113287-1-joel@jms.id.au> References: <20210825222106.3113287-1-joel@jms.id.au> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org LiteETH is a small footprint and configurable Ethernet core for FPGA based system on chips. The hardware is parametrised by the size and number of the slots in it's receive and send buffers. These are described as properties, with the commonly used values set as the default. Signed-off-by: Joel Stanley --- v2: - Fix dtschema check warning relating to registers - Add names to the registers to make it easier to distinguish which is what region - Add mdio description - Include ethernet-controller parent description v3: - Define names for reg-names - update example to match common case - describe the hardware using slots and slot sizes. This is how the hardware is pramaterised, and it makes more sense than trying to use the rx/tx-fifo-size properties v4: - Don't need minItems if it is equal to 'items' length. - Add Rob's r-b --- .../bindings/net/litex,liteeth.yaml | 98 +++++++++++++++++++ 1 file changed, 98 insertions(+) create mode 100644 Documentation/devicetree/bindings/net/litex,liteeth.yaml -- 2.33.0 diff --git a/Documentation/devicetree/bindings/net/litex,liteeth.yaml b/Documentation/devicetree/bindings/net/litex,liteeth.yaml new file mode 100644 index 000000000000..76c164a8199a --- /dev/null +++ b/Documentation/devicetree/bindings/net/litex,liteeth.yaml @@ -0,0 +1,98 @@ +# SPDX-License-Identifier: GPL-2.0-or-later OR BSD-2-Clause +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/net/litex,liteeth.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: LiteX LiteETH ethernet device + +maintainers: + - Joel Stanley + +description: | + LiteETH is a small footprint and configurable Ethernet core for FPGA based + system on chips. + + The hardware source is Open Source and can be found on at + https://github.com/enjoy-digital/liteeth/. + +allOf: + - $ref: ethernet-controller.yaml# + +properties: + compatible: + const: litex,liteeth + + reg: + items: + - description: MAC registers + - description: MDIO registers + - description: Packet buffer + + reg-names: + items: + - const: mac + - const: mdio + - const: buffer + + interrupts: + maxItems: 1 + + litex,rx-slots: + description: Number of slots in the receive buffer + $ref: /schemas/types.yaml#/definitions/uint32 + minimum: 1 + default: 2 + + litex,tx-slots: + description: Number of slots in the transmit buffer + $ref: /schemas/types.yaml#/definitions/uint32 + minimum: 1 + default: 2 + + litex,slot-size: + description: Size in bytes of a slot in the tx/rx buffer + $ref: /schemas/types.yaml#/definitions/uint32 + minimum: 0x800 + default: 0x800 + + mac-address: true + local-mac-address: true + phy-handle: true + + mdio: + $ref: mdio.yaml# + +required: + - compatible + - reg + - interrupts + +additionalProperties: false + +examples: + - | + mac: ethernet@8020000 { + compatible = "litex,liteeth"; + reg = <0x8021000 0x100>, + <0x8020800 0x100>, + <0x8030000 0x2000>; + reg-names = "mac", "mdio", "buffer"; + litex,rx-slots = <2>; + litex,tx-slots = <2>; + litex,slot-size = <0x800>; + interrupts = <0x11 0x1>; + phy-handle = <ð_phy>; + + mdio { + #address-cells = <1>; + #size-cells = <0>; + + eth_phy: ethernet-phy@0 { + reg = <0>; + }; + }; + }; +... + +# vim: set ts=2 sw=2 sts=2 tw=80 et cc=80 ft=yaml : From patchwork Wed Aug 25 22:21:06 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Joel Stanley X-Patchwork-Id: 502315 Delivered-To: patch@linaro.org Received: by 2002:a02:6f15:0:0:0:0:0 with SMTP id x21csp1020581jab; Wed, 25 Aug 2021 15:21:35 -0700 (PDT) X-Google-Smtp-Source: ABdhPJwjqN0QEvPZ306ZxayFq28MlWfbP4T6osTYLQrfFddCACHARsppzqkYigQSfxySR7CZ8OnK X-Received: by 2002:aa7:c585:: with SMTP id g5mr788082edq.340.1629930095427; Wed, 25 Aug 2021 15:21:35 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1629930095; cv=none; d=google.com; s=arc-20160816; b=PJxrocHdy4tO6gWVLwZfTnDJG1gWVzC6stWynjiU8077HEPDcOc2AVx1uvj112tf+C jp/LBWt3pmdUuc13bmY24LdsOTzEGZ820YH6oMsndJsjmPbbO+hd8+dwjAD+9CRr95QR ZL5Po6bupAQj9TWAZ6l0Ib5pdnuYsnX1LbfHOEOrVLqfPsGWtXROXABIafSuDW/vxNk1 07IqE5vUeh4N4BTgcsIJzVg8wItH2Wg9KFUAElpQ3oHNzNBMU5W4hr0vb6PuYTKRx49y nZ7gMBxKqAl3sZYtrvuuoHHke47ReuzYDPnEXK+SofLMGMY8S2tby4GSOFVIPkSDTC/+ GDCA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from:sender :dkim-signature; bh=2Ww2RUFxqyXQIK1c3xG4etLpNVVDisq3LvB1oEun3Nc=; b=wLNJcLUp+V1grT1Pz640VTrDJvPkjm6cBNCe225wl1xSB97jzRkjuMMSszuKoFQulG QXsR6BX12ju+ewDvgWrcJCLcQWK2FxLFhIS4fdGW+BsnAYkjCRfOT+lwJ/Z3gaJfEO1u RloNxzA8ZoJK8XDPxSclYYhrgS+OIk8hF51JBdsmNom0wj3jyXk0VMMjGn28jD5b89dx GKLkZv2cT1TmF1Ra/TA4JBW+tMQbYvG0w85WtEB1VtL5a2xbDYHCBHPIgexAcyky5AP3 KPojpt5LfjuVVx5jtOg2IvzUrlqEPdKZG6luBvB5UOuiA5uDCZ1qj/84MbDZFerZYT+a mdvA== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=AUIVRi3u; spf=pass (google.com: domain of devicetree-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=devicetree-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. 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Miller" , Jakub Kicinski , Rob Herring Cc: Karol Gugala , Mateusz Holenko , devicetree@vger.kernel.org, Florent Kermarrec , "Gabriel L . Somlo" , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, David Shah , Stafford Horne Subject: [PATCH v4 2/2] net: Add driver for LiteX's LiteETH network interface Date: Thu, 26 Aug 2021 07:51:06 +0930 Message-Id: <20210825222106.3113287-3-joel@jms.id.au> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210825222106.3113287-1-joel@jms.id.au> References: <20210825222106.3113287-1-joel@jms.id.au> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org LiteX is a soft system-on-chip that targets FPGAs. LiteETH is a basic network device that is commonly used in LiteX designs. The driver was first written in 2017 and has been maintained by the LiteX community in various trees. Thank you to all who have contributed. Co-developed-by: Gabriel Somlo Co-developed-by: David Shah Co-developed-by: Stafford Horne Signed-off-by: Joel Stanley Tested-by: Gabriel Somlo Reviewed-by: Gabriel Somlo --- v2: - check for bad len in liteeth_rx before getting skb - use netdev_alloc_skb_ip_align - remove unused duplex/speed and mii_bus variables - set carrier off when stopping device - increment packet count in the same place as bytes - fix error return code when irq could not be found - remove request of mdio base address until it is used - fix of_property_read line wrapping/alignment - only check that reader isn't busy, and then send off next packet - drop third reset - Add an description to the kconfig text - stop tx queue when busy and re-start after tx complete irq fires - use litex accessors to support big endain socs - clean up unused includes - use standard fifo-depth properties, which are in bytes v3: - make fifo helper static - fix error messages about invalid slot sizes - use slot size from device tree instead of inferring it - update to match the latest version of the bindings, which describes the number of slots v4: - Add Gabriel's t-b and r-b --- drivers/net/ethernet/Kconfig | 1 + drivers/net/ethernet/Makefile | 1 + drivers/net/ethernet/litex/Kconfig | 27 ++ drivers/net/ethernet/litex/Makefile | 5 + drivers/net/ethernet/litex/litex_liteeth.c | 317 +++++++++++++++++++++ 5 files changed, 351 insertions(+) create mode 100644 drivers/net/ethernet/litex/Kconfig create mode 100644 drivers/net/ethernet/litex/Makefile create mode 100644 drivers/net/ethernet/litex/litex_liteeth.c -- 2.33.0 diff --git a/drivers/net/ethernet/Kconfig b/drivers/net/ethernet/Kconfig index 1cdff1dca790..d796684ec9ca 100644 --- a/drivers/net/ethernet/Kconfig +++ b/drivers/net/ethernet/Kconfig @@ -118,6 +118,7 @@ config LANTIQ_XRX200 Support for the PMAC of the Gigabit switch (GSWIP) inside the Lantiq / Intel VRX200 VDSL SoC +source "drivers/net/ethernet/litex/Kconfig" source "drivers/net/ethernet/marvell/Kconfig" source "drivers/net/ethernet/mediatek/Kconfig" source "drivers/net/ethernet/mellanox/Kconfig" diff --git a/drivers/net/ethernet/Makefile b/drivers/net/ethernet/Makefile index cb3f9084a21b..aaa5078cd7d1 100644 --- a/drivers/net/ethernet/Makefile +++ b/drivers/net/ethernet/Makefile @@ -51,6 +51,7 @@ obj-$(CONFIG_JME) += jme.o obj-$(CONFIG_KORINA) += korina.o obj-$(CONFIG_LANTIQ_ETOP) += lantiq_etop.o obj-$(CONFIG_LANTIQ_XRX200) += lantiq_xrx200.o +obj-$(CONFIG_NET_VENDOR_LITEX) += litex/ obj-$(CONFIG_NET_VENDOR_MARVELL) += marvell/ obj-$(CONFIG_NET_VENDOR_MEDIATEK) += mediatek/ obj-$(CONFIG_NET_VENDOR_MELLANOX) += mellanox/ diff --git a/drivers/net/ethernet/litex/Kconfig b/drivers/net/ethernet/litex/Kconfig new file mode 100644 index 000000000000..265dba414b41 --- /dev/null +++ b/drivers/net/ethernet/litex/Kconfig @@ -0,0 +1,27 @@ +# +# LiteX device configuration +# + +config NET_VENDOR_LITEX + bool "LiteX devices" + default y + help + If you have a network (Ethernet) card belonging to this class, say Y. + + Note that the answer to this question doesn't directly affect the + kernel: saying N will just cause the configurator to skip all + the questions about LiteX devices. If you say Y, you will be asked + for your specific card in the following questions. + +if NET_VENDOR_LITEX + +config LITEX_LITEETH + tristate "LiteX Ethernet support" + help + If you wish to compile a kernel for hardware with a LiteX LiteEth + device then you should answer Y to this. + + LiteX is a soft system-on-chip that targets FPGAs. LiteETH is a basic + network device that is commonly used in LiteX designs. + +endif # NET_VENDOR_LITEX diff --git a/drivers/net/ethernet/litex/Makefile b/drivers/net/ethernet/litex/Makefile new file mode 100644 index 000000000000..9343b73b8e49 --- /dev/null +++ b/drivers/net/ethernet/litex/Makefile @@ -0,0 +1,5 @@ +# +# Makefile for the LiteX network device drivers. +# + +obj-$(CONFIG_LITEX_LITEETH) += litex_liteeth.o diff --git a/drivers/net/ethernet/litex/litex_liteeth.c b/drivers/net/ethernet/litex/litex_liteeth.c new file mode 100644 index 000000000000..10e6f2dedfad --- /dev/null +++ b/drivers/net/ethernet/litex/litex_liteeth.c @@ -0,0 +1,317 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * LiteX Liteeth Ethernet + * + * Copyright 2017 Joel Stanley + * + */ + +#include +#include +#include +#include +#include +#include + +#define LITEETH_WRITER_SLOT 0x00 +#define LITEETH_WRITER_LENGTH 0x04 +#define LITEETH_WRITER_ERRORS 0x08 +#define LITEETH_WRITER_EV_STATUS 0x0C +#define LITEETH_WRITER_EV_PENDING 0x10 +#define LITEETH_WRITER_EV_ENABLE 0x14 +#define LITEETH_READER_START 0x18 +#define LITEETH_READER_READY 0x1C +#define LITEETH_READER_LEVEL 0x20 +#define LITEETH_READER_SLOT 0x24 +#define LITEETH_READER_LENGTH 0x28 +#define LITEETH_READER_EV_STATUS 0x2C +#define LITEETH_READER_EV_PENDING 0x30 +#define LITEETH_READER_EV_ENABLE 0x34 +#define LITEETH_PREAMBLE_CRC 0x38 +#define LITEETH_PREAMBLE_ERRORS 0x3C +#define LITEETH_CRC_ERRORS 0x40 + +#define LITEETH_PHY_CRG_RESET 0x00 +#define LITEETH_MDIO_W 0x04 +#define LITEETH_MDIO_R 0x0C + +#define DRV_NAME "liteeth" + +struct liteeth { + void __iomem *base; + struct net_device *netdev; + struct device *dev; + u32 slot_size; + + /* Tx */ + u32 tx_slot; + u32 num_tx_slots; + void __iomem *tx_base; + + /* Rx */ + u32 rx_slot; + u32 num_rx_slots; + void __iomem *rx_base; +}; + +static int liteeth_rx(struct net_device *netdev) +{ + struct liteeth *priv = netdev_priv(netdev); + struct sk_buff *skb; + unsigned char *data; + u8 rx_slot; + int len; + + rx_slot = litex_read8(priv->base + LITEETH_WRITER_SLOT); + len = litex_read32(priv->base + LITEETH_WRITER_LENGTH); + + if (len == 0 || len > 2048) + goto rx_drop; + + skb = netdev_alloc_skb_ip_align(netdev, len); + if (!skb) { + netdev_err(netdev, "couldn't get memory\n"); + goto rx_drop; + } + + data = skb_put(skb, len); + memcpy_fromio(data, priv->rx_base + rx_slot * priv->slot_size, len); + skb->protocol = eth_type_trans(skb, netdev); + + netdev->stats.rx_packets++; + netdev->stats.rx_bytes += len; + + return netif_rx(skb); + +rx_drop: + netdev->stats.rx_dropped++; + netdev->stats.rx_errors++; + + return NET_RX_DROP; +} + +static irqreturn_t liteeth_interrupt(int irq, void *dev_id) +{ + struct net_device *netdev = dev_id; + struct liteeth *priv = netdev_priv(netdev); + u8 reg; + + reg = litex_read8(priv->base + LITEETH_READER_EV_PENDING); + if (reg) { + if (netif_queue_stopped(netdev)) + netif_wake_queue(netdev); + litex_write8(priv->base + LITEETH_READER_EV_PENDING, reg); + } + + reg = litex_read8(priv->base + LITEETH_WRITER_EV_PENDING); + if (reg) { + liteeth_rx(netdev); + litex_write8(priv->base + LITEETH_WRITER_EV_PENDING, reg); + } + + return IRQ_HANDLED; +} + +static int liteeth_open(struct net_device *netdev) +{ + struct liteeth *priv = netdev_priv(netdev); + int err; + + /* Clear pending events */ + litex_write8(priv->base + LITEETH_WRITER_EV_PENDING, 1); + litex_write8(priv->base + LITEETH_READER_EV_PENDING, 1); + + err = request_irq(netdev->irq, liteeth_interrupt, 0, netdev->name, netdev); + if (err) { + netdev_err(netdev, "failed to request irq %d\n", netdev->irq); + return err; + } + + /* Enable IRQs */ + litex_write8(priv->base + LITEETH_WRITER_EV_ENABLE, 1); + litex_write8(priv->base + LITEETH_READER_EV_ENABLE, 1); + + netif_carrier_on(netdev); + netif_start_queue(netdev); + + return 0; +} + +static int liteeth_stop(struct net_device *netdev) +{ + struct liteeth *priv = netdev_priv(netdev); + + netif_stop_queue(netdev); + netif_carrier_off(netdev); + + litex_write8(priv->base + LITEETH_WRITER_EV_ENABLE, 0); + litex_write8(priv->base + LITEETH_READER_EV_ENABLE, 0); + + free_irq(netdev->irq, netdev); + + return 0; +} + +static int liteeth_start_xmit(struct sk_buff *skb, struct net_device *netdev) +{ + struct liteeth *priv = netdev_priv(netdev); + void __iomem *txbuffer; + + if (!litex_read8(priv->base + LITEETH_READER_READY)) { + if (net_ratelimit()) + netdev_err(netdev, "LITEETH_READER_READY not ready\n"); + + netif_stop_queue(netdev); + + return NETDEV_TX_BUSY; + } + + /* Reject oversize packets */ + if (unlikely(skb->len > priv->slot_size)) { + if (net_ratelimit()) + netdev_err(netdev, "tx packet too big\n"); + + dev_kfree_skb_any(skb); + netdev->stats.tx_dropped++; + netdev->stats.tx_errors++; + + return NETDEV_TX_OK; + } + + txbuffer = priv->tx_base + priv->tx_slot * priv->slot_size; + memcpy_toio(txbuffer, skb->data, skb->len); + litex_write8(priv->base + LITEETH_READER_SLOT, priv->tx_slot); + litex_write16(priv->base + LITEETH_READER_LENGTH, skb->len); + litex_write8(priv->base + LITEETH_READER_START, 1); + + netdev->stats.tx_bytes += skb->len; + netdev->stats.tx_packets++; + + priv->tx_slot = (priv->tx_slot + 1) % priv->num_tx_slots; + dev_kfree_skb_any(skb); + + return NETDEV_TX_OK; +} + +static const struct net_device_ops liteeth_netdev_ops = { + .ndo_open = liteeth_open, + .ndo_stop = liteeth_stop, + .ndo_start_xmit = liteeth_start_xmit, +}; + +static void liteeth_setup_slots(struct liteeth *priv) +{ + struct device_node *np = priv->dev->of_node; + int err; + + err = of_property_read_u32(np, "litex,rx-slots", &priv->num_rx_slots); + if (err) { + dev_dbg(priv->dev, "unable to get litex,rx-slots, using 2\n"); + priv->num_rx_slots = 2; + } + + err = of_property_read_u32(np, "litex,tx-slots", &priv->num_tx_slots); + if (err) { + dev_dbg(priv->dev, "unable to get litex,tx-slots, using 2\n"); + priv->num_tx_slots = 2; + } + + err = of_property_read_u32(np, "litex,slot-size", &priv->slot_size); + if (err) { + dev_dbg(priv->dev, "unable to get litex,slot-size, using 0x800\n"); + priv->slot_size = 0x800; + } +} + +static int liteeth_probe(struct platform_device *pdev) +{ + struct net_device *netdev; + void __iomem *buf_base; + struct resource *res; + struct liteeth *priv; + int irq, err; + + netdev = devm_alloc_etherdev(&pdev->dev, sizeof(*priv)); + if (!netdev) + return -ENOMEM; + + SET_NETDEV_DEV(netdev, &pdev->dev); + platform_set_drvdata(pdev, netdev); + + priv = netdev_priv(netdev); + priv->netdev = netdev; + priv->dev = &pdev->dev; + + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + dev_err(&pdev->dev, "Failed to get IRQ %d\n", irq); + return irq; + } + netdev->irq = irq; + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mac"); + priv->base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(priv->base)) + return PTR_ERR(priv->base); + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "buffer"); + buf_base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(buf_base)) + return PTR_ERR(buf_base); + + liteeth_setup_slots(priv); + + /* Rx slots */ + priv->rx_base = buf_base; + priv->rx_slot = 0; + + /* Tx slots come after Rx slots */ + priv->tx_base = buf_base + priv->num_rx_slots * priv->slot_size; + priv->tx_slot = 0; + + err = of_get_mac_address(pdev->dev.of_node, netdev->dev_addr); + if (err) + eth_hw_addr_random(netdev); + + netdev->netdev_ops = &liteeth_netdev_ops; + + err = register_netdev(netdev); + if (err) { + dev_err(&pdev->dev, "Failed to register netdev %d\n", err); + return err; + } + + netdev_info(netdev, "irq %d slots: tx %d rx %d size %d\n", + netdev->irq, priv->num_tx_slots, priv->num_rx_slots, priv->slot_size); + + return 0; +} + +static int liteeth_remove(struct platform_device *pdev) +{ + struct net_device *netdev = platform_get_drvdata(pdev); + + unregister_netdev(netdev); + free_netdev(netdev); + + return 0; +} + +static const struct of_device_id liteeth_of_match[] = { + { .compatible = "litex,liteeth" }, + { } +}; +MODULE_DEVICE_TABLE(of, liteeth_of_match); + +static struct platform_driver liteeth_driver = { + .probe = liteeth_probe, + .remove = liteeth_remove, + .driver = { + .name = DRV_NAME, + .of_match_table = liteeth_of_match, + }, +}; +module_platform_driver(liteeth_driver); + +MODULE_AUTHOR("Joel Stanley "); +MODULE_LICENSE("GPL");