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Date: Sun, 26 Jun 2022 14:39:08 +0200
From: Stefan Wahren <stefan.wahren@...e.com>
To: alexandru.tachici@...log.com
Cc: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
devicetree@...r.kernel.org, krzysztof.kozlowski+dt@...aro.org,
gerhard@...leder-embedded.com, geert+renesas@...der.be,
joel@....id.au, wellslutw@...il.com, geert@...ux-m68k.org,
robh+dt@...nel.org, d.michailidis@...gible.com,
stephen@...workplumber.org, l.stelmach@...sung.com,
linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [net-next 1/2] net: ethernet: adi: Add ADIN1110 support
Hi Alexandru,
Am 24.06.22 um 22:06 schrieb alexandru.tachici@...log.com:
> From: Alexandru Tachici <alexandru.tachici@...log.com>
>
> The ADIN1110 is a low power single port 10BASE-T1L MAC-PHY
> designed for industrial Ethernet applications. It integrates
> an Ethernet PHY core with a MAC and all the associated analog
> circuitry, input and output clock buffering.
>
> ADIN1110 MAC-PHY encapsulates the ADIN1100 PHY. The PHY registers
> can be accessed through the MDIO MAC registers.
> We are registering an MDIO bus with custom read/write in order
> to let the PHY to be discovered by the PAL. This will let
> the ADIN1100 Linux driver to probe and take control of
> the PHY.
>
> The ADIN2111 is a low power, low complexity, two-Ethernet ports
> switch with integrated 10BASE-T1L PHYs and one serial peripheral
> interface (SPI) port.
>
> The device is designed for industrial Ethernet applications using
> low power constrained nodes and is compliant with the IEEE 802.3cg-2019
> Ethernet standard for long reach 10 Mbps single pair Ethernet (SPE).
> The switch supports various routing configurations between
> the two Ethernet ports and the SPI host port providing a flexible
> solution for line, daisy-chain, or ring network topologies.
>
> The ADIN2111 supports cable reach of up to 1700 meters with ultra
> low power consumption of 77 mW. The two PHY cores support the
> 1.0 V p-p operating mode and the 2.4 V p-p operating mode defined
> in the IEEE 802.3cg standard.
>
> The device integrates the switch, two Ethernet physical layer (PHY)
> cores with a media access control (MAC) interface and all the
> associated analog circuitry, and input and output clock buffering.
>
> The device also includes internal buffer queues, the SPI and
> subsystem registers, as well as the control logic to manage the reset
> and clock control and hardware pin configuration.
>
> Access to the PHYs is exposed via an internal MDIO bus. Writes/reads
> can be performed by reading/writing to the ADIN2111 MDIO registers
> via SPI.
>
> On probe, for each port, a struct net_device is allocated and
> registered. When both ports are added to the same bridge, the driver
> will enable offloading of frame forwarding at the hardware level.
>
> Co-developed-by: Lennart Franzen <lennart@...omain.com>
> Signed-off-by: Lennart Franzen <lennart@...omain.com>
> Signed-off-by: Alexandru Tachici <alexandru.tachici@...log.com>
> ---
> drivers/net/ethernet/Kconfig | 1 +
> drivers/net/ethernet/Makefile | 1 +
> drivers/net/ethernet/adi/Kconfig | 28 +
> drivers/net/ethernet/adi/Makefile | 6 +
> drivers/net/ethernet/adi/adin1110.c | 1312 +++++++++++++++++++++++++++
> 5 files changed, 1348 insertions(+)
> create mode 100644 drivers/net/ethernet/adi/Kconfig
> create mode 100644 drivers/net/ethernet/adi/Makefile
> create mode 100644 drivers/net/ethernet/adi/adin1110.c
>
> diff --git a/drivers/net/ethernet/Kconfig b/drivers/net/ethernet/Kconfig
> index 955abbc5490e..954cd8c96032 100644
> --- a/drivers/net/ethernet/Kconfig
> +++ b/drivers/net/ethernet/Kconfig
> @@ -120,6 +120,7 @@ config LANTIQ_XRX200
> Support for the PMAC of the Gigabit switch (GSWIP) inside the
> Lantiq / Intel VRX200 VDSL SoC
>
> +source "drivers/net/ethernet/adi/Kconfig"
> source "drivers/net/ethernet/litex/Kconfig"
> source "drivers/net/ethernet/marvell/Kconfig"
> source "drivers/net/ethernet/mediatek/Kconfig"
> diff --git a/drivers/net/ethernet/Makefile b/drivers/net/ethernet/Makefile
> index 9eb01169957f..bc65ca0d9b4c 100644
> --- a/drivers/net/ethernet/Makefile
> +++ b/drivers/net/ethernet/Makefile
> @@ -8,6 +8,7 @@ obj-$(CONFIG_NET_VENDOR_8390) += 8390/
> obj-$(CONFIG_NET_VENDOR_ACTIONS) += actions/
> obj-$(CONFIG_NET_VENDOR_ADAPTEC) += adaptec/
> obj-$(CONFIG_GRETH) += aeroflex/
> +obj-$(CONFIG_NET_VENDOR_ADI) += adi/
> obj-$(CONFIG_NET_VENDOR_AGERE) += agere/
> obj-$(CONFIG_NET_VENDOR_ALACRITECH) += alacritech/
> obj-$(CONFIG_NET_VENDOR_ALLWINNER) += allwinner/
> diff --git a/drivers/net/ethernet/adi/Kconfig b/drivers/net/ethernet/adi/Kconfig
> new file mode 100644
> index 000000000000..da3bdd302502
> --- /dev/null
> +++ b/drivers/net/ethernet/adi/Kconfig
> @@ -0,0 +1,28 @@
> +# SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause
> +#
> +# Analog Devices device configuration
> +#
> +
> +config NET_VENDOR_ADI
> + bool "Analog Devices devices"
> + default y
> + depends on SPI
> + 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 ADI devices. If you say Y, you will be asked
> + for your specific card in the following questions.
> +
> +if NET_VENDOR_ADI
> +
> +config ADIN1110
> + tristate "Analog Devices ADIN1110 MAC-PHY"
> + depends on SPI && NET_SWITCHDEV
> + select CRC8
> + help
> + Say yes here to build support for Analog Devices ADIN1110
> + Low Power 10BASE-T1L Ethernet MAC-PHY.
> +
> +endif # NET_VENDOR_ADI
> diff --git a/drivers/net/ethernet/adi/Makefile b/drivers/net/ethernet/adi/Makefile
> new file mode 100644
> index 000000000000..d0383d94303c
> --- /dev/null
> +++ b/drivers/net/ethernet/adi/Makefile
> @@ -0,0 +1,6 @@
> +# SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause
> +#
> +# Makefile for the Analog Devices network device drivers.
> +#
> +
> +obj-$(CONFIG_ADIN1110) += adin1110.o
> diff --git a/drivers/net/ethernet/adi/adin1110.c b/drivers/net/ethernet/adi/adin1110.c
> new file mode 100644
> index 000000000000..fdefd6fdeb9d
> --- /dev/null
> +++ b/drivers/net/ethernet/adi/adin1110.c
> @@ -0,0 +1,1312 @@
> +// SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause
> +/* ADIN1110 Low Power 10BASE-T1L Ethernet MAC-PHY
> + * ADIN2111 2-Port Ethernet Switch with Integrated 10BASE-T1L PHY
> + *
> + * Copyright 2021 Analog Devices Inc.
> + */
> +
> +#include <linux/bitfield.h>
> +#include <linux/bits.h>
> +#include <linux/cache.h>
> +#include <linux/crc8.h>
> +#include <linux/etherdevice.h>
> +#include <linux/ethtool.h>
> +#include <linux/interrupt.h>
> +#include <linux/iopoll.h>
> +#include <linux/gpio.h>
> +#include <linux/kernel.h>
> +#include <linux/mii.h>
> +#include <linux/module.h>
> +#include <linux/netdevice.h>
> +#include <linux/regulator/consumer.h>
> +#include <linux/phy.h>
> +#include <linux/property.h>
> +#include <linux/spi/spi.h>
> +
> +#include <asm/unaligned.h>
> +
> +#define ADIN1110_PHY_ID 0x1
> +
> +#define ADIN1110_RESET 0x03
> +#define ADIN1110_SWRESET BIT(0)
> +
> +#define ADIN1110_CONFIG1 0x04
> +#define ADIN1110_CONFIG1_SYNC BIT(15)
> +
> +#define ADIN1110_CONFIG2 0x06
> +#define ADIN2111_FWD_UNK2PORT GENMASK(14, 13)
> +#define ADIN2111_P2_FWD_UNK2HOST BIT(12)
> +#define ADIN1110_CRC_APPEND BIT(5)
> +#define ADIN1110_FWD_UNK2HOST BIT(2)
> +
> +#define ADIN1110_STATUS0 0x08
> +
> +#define ADIN1110_STATUS1 0x09
> +#define ADIN2111_P2_RX_RDY BIT(17)
> +#define ADIN1110_SPI_ERR BIT(10)
> +#define ADIN1110_RX_RDY BIT(4)
> +#define ADIN1110_TX_RDY BIT(3)
> +
> +#define ADIN1110_IMASK1 0x0D
> +#define ADIN2111_RX_RDY_IRQ BIT(17)
> +#define ADIN1110_SPI_ERR_IRQ BIT(10)
> +#define ADIN1110_RX_RDY_IRQ BIT(4)
> +#define ADIN1110_TX_RDY_IRQ BIT(3)
> +
> +#define ADIN1110_MDIOACC 0x20
> +#define ADIN1110_MDIO_TRDONE BIT(31)
> +#define ADIN1110_MDIO_TAERR BIT(30)
> +#define ADIN1110_MDIO_ST GENMASK(29, 28)
> +#define ADIN1110_MDIO_OP GENMASK(27, 26)
> +#define ADIN1110_MDIO_PRTAD GENMASK(25, 21)
> +#define ADIN1110_MDIO_DEVAD GENMASK(20, 16)
> +#define ADIN1110_MDIO_DATA GENMASK(15, 0)
> +
> +#define ADIN1110_TX_FSIZE 0x30
> +#define ADIN1110_TX 0x31
> +#define ADIN1110_TX_SPACE 0x32
> +#define ADIN1110_RX_THRESH 0x33
> +#define ADIN1110_TX_THRESH 0x34
> +
> +#define ADIN1110_FIFO_CLR 0x36
> +#define ADIN1110_FIFO_SIZE 0x3E
> +#define ADIN1110_TFC 0x3F
> +
> +#define ADIN1110_MAC_ADDR_FILTER_UPR 0x50
> +#define ADIN2111_MAC_ADDR_APPLY2PORT2 BIT(31)
> +#define ADIN1110_MAC_ADDR_APPLY2PORT BIT(30)
> +#define ADIN1110_MAC_ADDR_HOST_PRI BIT(19)
> +#define ADIN2111_MAC_ADDR_TO_OTHER_PORT BIT(17)
> +#define ADIN1110_MAC_ADDR_TO_HOST BIT(16)
> +#define ADIN1110_MAC_ADDR GENMASK(15, 0)
> +
> +#define ADIN1110_MAC_ADDR_FILTER_LWR 0x51
> +
> +#define ADIN1110_MAC_ADDR_MASK_UPR 0x70
> +#define ADIN1110_MAC_ADDR_MASK_LWR 0x71
> +
> +#define ADIN1110_RX_FSIZE 0x90
> +#define ADIN1110_RX 0x91
> +
> +#define ADIN1110_RX_FRM_CNT(x) (0xA0 + ((x) * 0x30))
> +#define ADIN1110_RX_MCAST_CNT(x) (0xA2 + ((x) * 0x30))
> +#define ADIN1110_RX_CRC_ERR_CNT(x) (0xA4 + ((x) * 0x30))
> +#define ADIN1110_RX_ALGN_ERR_CNT(x) (0xA5 + ((x) * 0x30))
> +#define ADIN1110_RX_LS_ERR_CNT(x) (0xA6 + ((x) * 0x30))
> +#define ADIN1110_RX_PHY_ERR_CNT(x) (0xA7 + ((x) * 0x30))
> +#define ADIN1110_RX_DROP_FULL_CNT(x) (0xAC + ((x) * 0x30))
> +
> +#define ADIN1110_TX_FRM_CNT(x) (0xA8 + ((x) * 0x30))
> +#define ADIN1110_TX_MCAST_CNT(x) (0xAA + ((x) * 0x30))
> +
> +#define ADIN2111_RX_P2_FSIZE 0xC0
> +#define ADIN2111_RX_P2 0xC1
> +
> +#define ADIN1110_CLEAR_STATUS0 0xFFF
> +#define ADIN1110_CLEAR_STATUS1 U32_MAX
> +
> +/* MDIO_OP codes */
> +#define ADIN1110_MDIO_OP_WR 0x1
> +#define ADIN1110_MDIO_OP_RD 0x3
> +
> +#define ADIN1110_CD BIT(7)
> +#define ADIN1110_WRITE BIT(5)
> +
> +#define ADIN1110_MAX_BUFF 2048
> +#define ADIN1110_WR_HEADER_LEN 2
> +#define ADIN1110_FRAME_HEADER_LEN 2
> +#define ADIN1110_INTERNAL_SIZE_HEADER_LEN 2
> +#define ADIN1110_RD_HEADER_LEN 3
> +#define ADIN1110_REG_LEN 4
> +#define ADIN1110_FEC_LEN 4
> +
> +#define ADIN1110_PHY_ID_VAL 0x0283BC91
> +#define ADIN2111_PHY_ID_VAL 0x0283BCA1
> +
> +#define ADIN1110_TX_SPACE_MAX 0x0FFF
> +
> +#define ADIN_MAC_MAX_PORTS 2
> +
> +#define ADIN_MAC_MULTICAST_ADDR_SLOT 0
> +#define ADIN_MAC_ADDR_SLOT 1
> +#define ADIN_MAC_BROADCAST_ADDR_SLOT 2
> +
> +DECLARE_CRC8_TABLE(adin1110_crc_table);
> +
> +enum adin1110_chips_id {
> + ADIN1110_MAC = 0,
> + ADIN2111_MAC,
> +};
> +
> +struct adin1110_cfg {
> + enum adin1110_chips_id id;
> + char name[MDIO_NAME_SIZE];
> + u32 phy_ids[PHY_MAX_ADDR];
> + u32 ports_nr;
> + u32 phy_id_val;
> +};
> +
> +struct adin1110_port_priv {
> + struct adin1110_priv *priv;
> + struct net_device *netdev;
> + struct net_device *bridge;
> + struct phy_device *phydev;
> + struct work_struct tx_work;
> + u64 rx_bytes;
> + u64 tx_bytes;
> + struct work_struct rx_mode_work;
> + u32 flags;
> + struct sk_buff_head txq;
> + u32 nr;
> + struct adin1110_cfg *cfg;
> +};
> +
> +struct adin1110_priv {
> + struct mutex lock; /* protect spi */
> + spinlock_t state_lock; /* protect RX mode */
> + bool forwarding;
> + struct mii_bus *mii_bus;
> + struct spi_device *spidev;
> + bool append_crc;
> + struct adin1110_cfg *cfg;
> + u32 tx_space;
> + u32 irq_mask;
> + int irq;
> + struct adin1110_port_priv *ports[ADIN_MAC_MAX_PORTS];
> + char mii_bus_name[MII_BUS_ID_SIZE];
> + u8 data[ADIN1110_MAX_BUFF] ____cacheline_aligned;
> +};
> +
> +struct adin1110_cfg adin1110_cfgs[] = {
> + {
> + .id = ADIN1110_MAC,
> + .name = "adin1110",
> + .phy_ids = {1},
> + .ports_nr = 1,
> + .phy_id_val = ADIN1110_PHY_ID_VAL,
> + },
> + {
> + .id = ADIN2111_MAC,
> + .name = "adin2111",
> + .phy_ids = {1, 2},
> + .ports_nr = 2,
> + .phy_id_val = ADIN2111_PHY_ID_VAL,
> + },
> +};
> +
> +static u8 adin1110_crc_data(u8 *data, u32 len)
> +{
> + return crc8(adin1110_crc_table, data, len, 0);
> +}
> +
> +static int adin1110_read_reg(struct adin1110_priv *priv, u16 reg, u32 *val)
> +{
> + struct spi_transfer t[2] = {0};
> + __le16 __reg = cpu_to_le16(reg);
> + u32 header_len = ADIN1110_RD_HEADER_LEN;
> + u32 read_len = ADIN1110_REG_LEN;
> + int ret;
> +
> + priv->data[0] = ADIN1110_CD | FIELD_GET(GENMASK(12, 8), __reg);
> + priv->data[1] = FIELD_GET(GENMASK(7, 0), __reg);
> + priv->data[2] = 0x00;
> +
> + if (priv->append_crc) {
> + priv->data[2] = adin1110_crc_data(&priv->data[0], 2);
> + priv->data[3] = 0x00;
> + header_len++;
> + }
> +
> + t[0].tx_buf = &priv->data[0];
> + t[0].len = header_len;
> +
> + if (priv->append_crc)
> + read_len++;
> +
> + memset(&priv->data[header_len], 0, read_len);
> + t[1].rx_buf = &priv->data[header_len];
> + t[1].len = read_len;
> +
> + ret = spi_sync_transfer(priv->spidev, t, 2);
> + if (ret)
> + return ret;
> +
> + if (priv->append_crc) {
> + u8 recv_crc;
> + u8 crc;
> +
> + crc = adin1110_crc_data(&priv->data[header_len], ADIN1110_REG_LEN);
> + recv_crc = priv->data[header_len + ADIN1110_REG_LEN];
> +
> + if (crc != recv_crc) {
> + dev_err(&priv->spidev->dev, "CRC error.");
This could flood the kernel log very fast. You should try to avoid this
at least with a rate limited version of dev_err.
> + return -EBADMSG;
> + }
> + }
> +
> + *val = get_unaligned_be32(&priv->data[header_len]);
> +
> + return ret;
> +}
> +
> +static int adin1110_write_reg(struct adin1110_priv *priv, u16 reg, u32 val)
> +{
> + u32 header_len = ADIN1110_WR_HEADER_LEN;
> + u32 write_len = ADIN1110_REG_LEN;
> + __le16 __reg = cpu_to_le16(reg);
> +
> + priv->data[0] = ADIN1110_CD | ADIN1110_WRITE | FIELD_GET(GENMASK(12, 8), __reg);
> + priv->data[1] = FIELD_GET(GENMASK(7, 0), __reg);
> +
> + if (priv->append_crc) {
> + priv->data[2] = adin1110_crc_data(&priv->data[0], header_len);
> + header_len++;
> + }
> +
> + put_unaligned_be32(val, &priv->data[header_len]);
> + if (priv->append_crc) {
> + priv->data[header_len + write_len] = adin1110_crc_data(&priv->data[header_len],
> + write_len);
> + write_len++;
> + }
> +
> + return spi_write(priv->spidev, &priv->data[0], header_len + write_len);
> +}
> +
> +static int adin1110_set_bits(struct adin1110_priv *priv, u16 reg, unsigned long mask,
> + unsigned long val)
> +{
> + u32 write_val;
> + int ret;
> +
> + ret = adin1110_read_reg(priv, reg, &write_val);
> + if (ret < 0)
> + return ret;
> +
> + set_mask_bits(&write_val, mask, val);
> +
> + return adin1110_write_reg(priv, reg, write_val);
> +}
> +
> +static int adin1110_round_len(int len)
> +{
> + /* can read/write only mutiples of 4 bytes of payload */
> + len = ALIGN(len, 4);
> +
> + /* NOTE: ADIN1110_WR_HEADER_LEN should be used for write ops. */
> + if (len + ADIN1110_RD_HEADER_LEN > ADIN1110_MAX_BUFF)
> + return -EINVAL;
> +
> + return len;
> +}
> +
> +static int adin1110_read_fifo(struct adin1110_port_priv *port_priv)
> +{
> + struct adin1110_priv *priv = port_priv->priv;
> + u32 header_len = ADIN1110_RD_HEADER_LEN;
> + struct spi_transfer t[2] = {0};
> + u32 frame_size_no_fcs;
> + struct sk_buff *rxb;
> + u32 frame_size;
> + int round_len;
> + __le16 __reg;
> + int ret;
> +
> + if (!port_priv->nr) {
> + __reg = cpu_to_le16(ADIN1110_RX);
> + ret = adin1110_read_reg(priv, ADIN1110_RX_FSIZE, &frame_size);
> + } else {
> + __reg = cpu_to_le16(ADIN2111_RX_P2);
> + ret = adin1110_read_reg(priv, ADIN2111_RX_P2_FSIZE, &frame_size);
> + }
> +
> + if (ret < 0)
> + return ret;
> +
> + /* the read frame size includes the extra 2 bytes from the ADIN1110 frame header */
> + if (frame_size < ADIN1110_FRAME_HEADER_LEN + ADIN1110_FEC_LEN)
> + return ret;
> +
> + round_len = adin1110_round_len(frame_size);
> + if (round_len < 0)
> + return ret;
> +
> + frame_size_no_fcs = frame_size - ADIN1110_FRAME_HEADER_LEN - ADIN1110_FEC_LEN;
> +
> + rxb = netdev_alloc_skb(port_priv->netdev, frame_size_no_fcs);
> + if (!rxb)
> + return -ENOMEM;
> +
> + memset(priv->data, 0, round_len + ADIN1110_RD_HEADER_LEN);
> +
> + priv->data[0] = ADIN1110_CD | FIELD_GET(GENMASK(12, 8), __reg);
> + priv->data[1] = FIELD_GET(GENMASK(7, 0), __reg);
> + priv->data[2] = 0x00;
Shouldn't this already be initialized by memset?
> +
> + if (priv->append_crc) {
> + priv->data[2] = adin1110_crc_data(&priv->data[0], 2);
> + priv->data[3] = 0x00;
> + header_len++;
> + }
> +
> + t[0].tx_buf = &priv->data[0];
> + t[0].len = header_len;
> +
> + t[1].rx_buf = &priv->data[header_len];
> + t[1].len = round_len;
> +
> + ret = spi_sync_transfer(priv->spidev, t, 2);
> + if (ret) {
> + kfree_skb(rxb);
> + return ret;
> + }
> +
> + /* Already forwarded to the other port if it did not match any MAC Addresses. */
> + if (priv->forwarding)
> + rxb->offload_fwd_mark = 1;
> +
> + skb_put(rxb, frame_size_no_fcs);
> + skb_copy_to_linear_data(rxb, &priv->data[header_len + ADIN1110_FRAME_HEADER_LEN],
> + frame_size_no_fcs);
> +
> + rxb->protocol = eth_type_trans(rxb, port_priv->netdev);
> +
> + netif_rx(rxb);
> +
> + port_priv->rx_bytes += frame_size - ADIN1110_FRAME_HEADER_LEN;
> +
> + return 0;
> +}
> +
> +static int adin1110_write_fifo(struct adin1110_port_priv *port_priv, struct sk_buff *txb)
> +{
> + struct adin1110_priv *priv = port_priv->priv;
> + __le16 __reg = cpu_to_le16(ADIN1110_TX);
> + u32 header_len = ADIN1110_WR_HEADER_LEN;
> + __be16 frame_header;
> + int padding = 0;
> + int round_len;
> + int padded_len;
> + int ret;
> +
> + /* Pad frame to 64 byte length,
> + * MAC nor PHY will otherwise add the
> + * required padding.
> + * The FEC will be added by the MAC internally.
> + */
> + if (txb->len + ADIN1110_FEC_LEN < 64)
> + padding = 64 - (txb->len + ADIN1110_FEC_LEN);
> +
> + padded_len = txb->len + padding + ADIN1110_FRAME_HEADER_LEN;
> +
> + round_len = adin1110_round_len(padded_len);
> + if (round_len < 0)
> + return round_len;
> +
> + ret = adin1110_write_reg(priv, ADIN1110_TX_FSIZE, padded_len);
> + if (ret < 0)
> + return ret;
> +
> + memset(priv->data, 0, round_len + ADIN1110_WR_HEADER_LEN);
> +
> + priv->data[0] = ADIN1110_CD | ADIN1110_WRITE | FIELD_GET(GENMASK(12, 8), __reg);
> + priv->data[1] = FIELD_GET(GENMASK(7, 0), __reg);
> + if (priv->append_crc) {
> + priv->data[2] = adin1110_crc_data(&priv->data[0], 2);
> + header_len++;
> + }
> +
> + /* mention the port on which to send the frame in the frame header */
> + frame_header = cpu_to_be16(port_priv->nr);
> + memcpy(&priv->data[header_len], &frame_header, ADIN1110_FRAME_HEADER_LEN);
> +
> + memcpy(&priv->data[header_len + ADIN1110_FRAME_HEADER_LEN], txb->data, txb->len);
> +
> + ret = spi_write(priv->spidev, &priv->data[0], round_len + header_len);
> + if (ret < 0)
> + return ret;
> +
> + port_priv->tx_bytes += txb->len;
> +
> + return 0;
> +}
> +
> +static int adin1110_read_mdio_acc(struct adin1110_priv *priv)
> +{
> + u32 val;
> + int ret;
> +
> + ret = adin1110_read_reg(priv, ADIN1110_MDIOACC, &val);
> + if (ret < 0)
> + return 0;
> +
> + return val;
> +}
> +
> +static int adin1110_mdio_read(struct mii_bus *bus, int phy_id, int reg)
> +{
> + struct adin1110_priv *priv = bus->priv;
> + u32 val = 0;
> + int ret;
> +
> + mutex_lock(&priv->lock);
> +
> + val |= FIELD_PREP(ADIN1110_MDIO_OP, ADIN1110_MDIO_OP_RD);
> + val |= FIELD_PREP(ADIN1110_MDIO_ST, 0x1);
> + val |= FIELD_PREP(ADIN1110_MDIO_PRTAD, phy_id);
> + val |= FIELD_PREP(ADIN1110_MDIO_DEVAD, reg);
> +
> + /* write the clause 22 read command to the chip */
> + ret = adin1110_write_reg(priv, ADIN1110_MDIOACC, val);
> + if (ret < 0) {
> + mutex_unlock(&priv->lock);
> + return ret;
> + }
> +
> + /* ADIN1110_MDIO_TRDONE BIT of the ADIN1110_MDIOACC
> + * register is set when the read is done.
> + * After the transaction is done, ADIN1110_MDIO_DATA
> + * bitfield of ADIN1110_MDIOACC register will contain
> + * the requested register value.
> + */
> + ret = readx_poll_timeout(adin1110_read_mdio_acc, priv, val, (val & ADIN1110_MDIO_TRDONE),
> + 10000, 30000);
> + mutex_unlock(&priv->lock);
> +
> + if (ret < 0)
> + return ret;
> +
> + return (val & ADIN1110_MDIO_DATA);
> +}
> +
> +static int adin1110_mdio_write(struct mii_bus *bus, int phy_id, int reg, u16 reg_val)
> +{
> + struct adin1110_priv *priv = bus->priv;
> + u32 val = 0;
> + int ret;
> +
> + mutex_lock(&priv->lock);
> +
> + val |= FIELD_PREP(ADIN1110_MDIO_OP, ADIN1110_MDIO_OP_WR);
> + val |= FIELD_PREP(ADIN1110_MDIO_ST, 0x1);
> + val |= FIELD_PREP(ADIN1110_MDIO_PRTAD, phy_id);
> + val |= FIELD_PREP(ADIN1110_MDIO_DEVAD, reg);
> + val |= FIELD_PREP(ADIN1110_MDIO_DATA, reg_val);
> +
> + /* write the clause 22 write command to the chip */
> + ret = adin1110_write_reg(priv, ADIN1110_MDIOACC, val);
> + if (ret < 0) {
> + mutex_unlock(&priv->lock);
> + return ret;
> + }
> +
> + ret = readx_poll_timeout(adin1110_read_mdio_acc, priv, val, (val & ADIN1110_MDIO_TRDONE),
> + 10000, 30000);
> + mutex_unlock(&priv->lock);
> +
> + return ret;
> +}
> +
> +/* ADIN1110 MAC-PHY contains an ADIN1100 PHY.
> + * ADIN2111 MAC-PHY contains two ADIN1100 PHYs.
> + * By registering a new MDIO bus we allow the PAL to discover
> + * the encapsulated PHY and probe the ADIN1100 driver.
> + */
> +static int adin1110_register_mdiobus(struct adin1110_priv *priv, struct device *dev)
> +{
> + struct mii_bus *mii_bus;
> + int ret;
> +
> + mii_bus = devm_mdiobus_alloc(dev);
> + if (!mii_bus)
> + return -ENOMEM;
> +
> + snprintf(priv->mii_bus_name, MII_BUS_ID_SIZE, "%s-%u",
> + priv->cfg->name, priv->spidev->chip_select);
> +
> + mii_bus->name = priv->mii_bus_name;
> + mii_bus->read = adin1110_mdio_read;
> + mii_bus->write = adin1110_mdio_write;
> + mii_bus->priv = priv;
> + mii_bus->parent = dev;
> + mii_bus->phy_mask = ~((u32)GENMASK(2, 0));
> + snprintf(mii_bus->id, MII_BUS_ID_SIZE, "%s", dev_name(dev));
> +
> + ret = devm_mdiobus_register(dev, mii_bus);
> + if (ret)
> + return ret;
> +
> + priv->mii_bus = mii_bus;
> +
> + return 0;
> +}
> +
> +static bool adin1110_port_rx_ready(struct adin1110_port_priv *port_priv, u32 status)
> +{
> + if (!port_priv->nr)
> + return !!(status & ADIN1110_RX_RDY);
> + else
> + return !!(status & ADIN2111_P2_RX_RDY);
> +}
> +
> +static void adin1110_read_frames(struct adin1110_port_priv *port_priv)
> +{
> + struct adin1110_priv *priv = port_priv->priv;
> + u32 status1;
> + int ret;
> +
> + while (1) {
> + ret = adin1110_read_reg(priv, ADIN1110_STATUS1, &status1);
> + if (ret < 0)
> + return;
> +
> + if (!adin1110_port_rx_ready(port_priv, status1))
> + break;
> +
> + ret = adin1110_read_fifo(port_priv);
> + if (ret < 0)
> + return;
> + }
> +}
> +
> +static void adin1110_wake_queues(struct adin1110_priv *priv)
> +{
> + int i;
> +
> + for (i = 0; i < priv->cfg->ports_nr; i++)
> + netif_wake_queue(priv->ports[i]->netdev);
> +}
> +
> +static irqreturn_t adin1110_irq(int irq, void *p)
> +{
> + struct adin1110_priv *priv = p;
> + u32 status1;
> + u32 val;
> + int ret;
> + int i;
> +
> + mutex_lock(&priv->lock);
> +
> + adin1110_read_reg(priv, ADIN1110_STATUS1, &status1);
status1 would be uninitialized in error case
> +
> + if (priv->append_crc && (status1 & ADIN1110_SPI_ERR))
> + dev_warn(&priv->spidev->dev, "SPI CRC error on write.\n");
Same as above. You should try to avoid this at least with a rate limited
version of dev_warn.
...
> +static void adin1110_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *di)
> +{
> + strscpy(di->driver, "ADIN1110", sizeof(di->driver));
> + strscpy(di->version, "1.00", sizeof(di->version));
AFAIK this version assigment should be dropped
> + strscpy(di->bus_info, dev_name(dev->dev.parent), sizeof(di->bus_info));
> +}
> +
> +static const struct ethtool_ops adin1110_ethtool_ops = {
> + .get_drvinfo = adin1110_get_drvinfo,
> + .get_link = ethtool_op_get_link,
> + .get_link_ksettings = phy_ethtool_get_link_ksettings,
> + .set_link_ksettings = phy_ethtool_set_link_ksettings,
> +};
> +
> +static void adin1110_adjust_link(struct net_device *dev)
> +{
> + struct phy_device *phydev = dev->phydev;
> +
> + if (!phydev->link)
> + phy_print_status(phydev);
> +}
> +
> +/* PHY ID is stored in the MAC registers too, check spi connection by reading it */
> +static int adin1110_check_spi(struct adin1110_priv *priv)
> +{
> + int ret;
> + u32 val;
> +
> + ret = adin1110_read_reg(priv, ADIN1110_PHY_ID, &val);
> + if (ret < 0)
> + return ret;
> +
> + if (val != priv->cfg->phy_id_val) {
> + dev_err(&priv->spidev->dev, "PHY ID read: %x\n", val);
User usually doesn't look at the kernel sources. So printing the
expected value might be helpful in error case.
> + return -EIO;
> + }
> +
> + return 0;
> +}
> +
> +static void adin1110_disconnect_phy(void *data)
> +{
> + phy_disconnect(data);
> +}
> +
> +static void adin1110_unregister_notifier(void *data)
> +{
> + unregister_netdevice_notifier(data);
> +}
> +
> +static int adin1110_hw_forwarding(struct adin1110_priv *priv, bool enable)
> +{
> + int mac_nr;
> + int ret;
> +
> + mutex_lock(&priv->lock);
> +
> + /* Configure MAC to forward unknown host to other port. */
> + ret = adin1110_set_bits(priv, ADIN1110_CONFIG2, ADIN2111_FWD_UNK2PORT,
> + enable ? ADIN2111_FWD_UNK2PORT : 0);
> + if (ret < 0) {
> + mutex_unlock(&priv->lock);
> + return ret;
> + }
> +
> + /* Broadcast and multicast should also be forwarded to the other port */
> + for (mac_nr = 0; mac_nr <= ADIN_MAC_BROADCAST_ADDR_SLOT; mac_nr++) {
> + u32 offset = mac_nr * 2;
> + u32 port_rules;
> + u32 port_rules_mask;
> + u32 val;
> +
> + if (mac_nr == ADIN_MAC_ADDR_SLOT)
> + continue;
> +
> + port_rules_mask = ADIN1110_MAC_ADDR_APPLY2PORT | ADIN2111_MAC_ADDR_APPLY2PORT2;
> + port_rules = port_rules_mask;
> + port_rules_mask |= ADIN2111_MAC_ADDR_TO_OTHER_PORT;
> + if (enable)
> + port_rules |= ADIN2111_MAC_ADDR_TO_OTHER_PORT;
> +
> + /* tell MAC to forward this DA to host */
> + val = port_rules | ADIN1110_MAC_ADDR_TO_HOST;
> + ret = adin1110_set_bits(priv, ADIN1110_MAC_ADDR_FILTER_UPR + offset,
> + port_rules_mask, port_rules);
> + if (ret < 0) {
> + mutex_unlock(&priv->lock);
> + return ret;
> + }
> + }
> +
> + ret = adin1110_set_bits(priv, ADIN1110_CONFIG2, ADIN2111_FWD_UNK2PORT,
> + ADIN2111_FWD_UNK2PORT);
> + if (ret < 0) {
> + mutex_unlock(&priv->lock);
> + return ret;
> + }
> +
> + ret = adin1110_set_bits(priv, ADIN1110_CONFIG1, ADIN1110_CONFIG1_SYNC,
> + ADIN1110_CONFIG1_SYNC);
> +
> + mutex_unlock(&priv->lock);
> +
> + if (ret < 0)
> + return ret;
> +
> + priv->forwarding = enable;
> +
> + return ret;
> +}
> +
> +static int adin1110_port_bridge_join(struct adin1110_port_priv *port_priv,
> + struct net_device *bridge)
> +{
> + struct adin1110_priv *priv = port_priv->priv;
> + int ret = 0;
> +
> + /* Having the same port belong to multiple bridges is not supported */
> + if (port_priv->bridge && port_priv->bridge != bridge)
> + return -EOPNOTSUPP;
> +
> + port_priv->bridge = bridge;
> +
> + /* If other port joined same bridge, allow forwarding between ports */
> + if (priv->ports[0]->bridge == priv->ports[1]->bridge)
> + ret = adin1110_hw_forwarding(priv, true);
> +
> + return ret;
> +}
> +
> +static int adin1110_port_bridge_leave(struct adin1110_port_priv *port_priv,
> + struct net_device *bridge)
> +{
> + struct adin1110_priv *priv = port_priv->priv;
> + int ret = 0;
> +
> + if (priv->ports[0]->bridge == priv->ports[1]->bridge)
> + ret = adin1110_hw_forwarding(priv, false);
> +
> + port_priv->bridge = NULL;
> +
> + return ret;
> +}
> +
> +static int adin1110_netdevice_event(struct notifier_block *unused, unsigned long event, void *ptr)
> +{
> + struct net_device *dev = netdev_notifier_info_to_dev(ptr);
> + struct adin1110_port_priv *port_priv = netdev_priv(dev);
> + struct netdev_notifier_changeupper_info *info = ptr;
> + int ret = 0;
> +
> + switch (event) {
> + case NETDEV_CHANGEUPPER:
> + if (netif_is_bridge_master(info->upper_dev)) {
> + if (info->linking)
> + ret = adin1110_port_bridge_join(port_priv, info->upper_dev);
> + else
> + ret = adin1110_port_bridge_leave(port_priv, info->upper_dev);
> + }
> + break;
> + default:
> + break;
> + }
> +
> + return notifier_from_errno(ret);
> +}
> +
> +struct notifier_block adin1110_netdevice_nb __read_mostly = {
> + .notifier_call = adin1110_netdevice_event,
> +};
> +
> +static int adin1110_probe_netdevs(struct adin1110_priv *priv)
> +{
> + struct device *dev = &priv->spidev->dev;
> + struct adin1110_port_priv *port_priv;
> + struct net_device *netdev;
> + int ret;
> + int i;
> +
> + for (i = 0; i < priv->cfg->ports_nr; i++) {
> + netdev = devm_alloc_etherdev(dev, sizeof(*port_priv));
> + if (!netdev)
> + return -ENOMEM;
> +
> + port_priv = netdev_priv(netdev);
> + port_priv->netdev = netdev;
> + port_priv->priv = priv;
> + port_priv->cfg = priv->cfg;
> + port_priv->nr = i;
> + priv->ports[i] = port_priv;
> + SET_NETDEV_DEV(netdev, dev);
> +
> + ret = device_get_ethdev_address(dev, netdev);
> + if (ret < 0)
> + return ret;
> +
> + netdev->irq = priv->spidev->irq;
> + INIT_WORK(&port_priv->tx_work, adin1110_tx_work);
> + INIT_WORK(&port_priv->rx_mode_work, adin1110_rx_mode_work);
> + skb_queue_head_init(&port_priv->txq);
> +
> + netif_carrier_off(netdev);
> +
> + netdev->if_port = IF_PORT_10BASET;
> + netdev->netdev_ops = &adin1110_netdev_ops;
> + netdev->ethtool_ops = &adin1110_ethtool_ops;
> + netdev->priv_flags |= IFF_UNICAST_FLT;
> + netdev->features |= NETIF_F_NETNS_LOCAL;
> +
> + ret = devm_register_netdev(dev, netdev);
> + if (ret < 0) {
> + dev_err(dev, "failed to register network device\n");
> + return ret;
> + }
> +
> + port_priv->phydev = get_phy_device(priv->mii_bus, i + 1, false);
> + if (!port_priv->phydev) {
> + netdev_err(netdev, "Could not find PHY with device address: %d.\n", i);
> + return -ENODEV;
> + }
> +
> + port_priv->phydev = phy_connect(netdev, phydev_name(port_priv->phydev),
> + adin1110_adjust_link, PHY_INTERFACE_MODE_MII);
> + if (IS_ERR(port_priv->phydev)) {
> + netdev_err(netdev, "Could not connect PHY with device address: %d.\n", i);
> + return PTR_ERR(port_priv->phydev);
> + }
> +
> + ret = devm_add_action_or_reset(dev, adin1110_disconnect_phy, port_priv->phydev);
> + if (ret < 0)
> + return ret;
> + }
> +
> + /* ADIN1110 INT_N pin will be used to signal the host */
> + ret = devm_request_threaded_irq(dev, priv->spidev->irq, NULL, adin1110_irq,
> + IRQF_TRIGGER_LOW | IRQF_ONESHOT, dev_name(dev), priv);
> + if (ret < 0)
> + return ret;
> +
> + if (priv->cfg->id == ADIN2111_MAC) {
> + ret = register_netdevice_notifier(&adin1110_netdevice_nb);
> + if (ret < 0)
> + return ret;
> +
> + ret = devm_add_action_or_reset(dev, adin1110_unregister_notifier,
> + &adin1110_netdevice_nb);
> + if (ret < 0)
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static int adin1110_probe(struct spi_device *spi)
> +{
> + const struct spi_device_id *dev_id = spi_get_device_id(spi);
> + struct device *dev = &spi->dev;
> + struct adin1110_priv *priv;
> + int ret;
> +
> + priv = devm_kzalloc(dev, sizeof(struct adin1110_priv), GFP_KERNEL);
> + if (!priv)
> + return -ENOMEM;
> +
> + priv->spidev = spi;
> + priv->cfg = &adin1110_cfgs[dev_id->driver_data];
> + spi->bits_per_word = 8;
SPI mode ?
> +
> + mutex_init(&priv->lock);
> + spin_lock_init(&priv->state_lock);
> +
> + /* use of CRC on control and data transactions is pin dependent */
> + priv->append_crc = device_property_read_bool(dev, "adi,spi-crc");
> + if (priv->append_crc)
> + crc8_populate_msb(adin1110_crc_table, 0x7);
> +
> + ret = adin1110_check_spi(priv);
> + if (ret < 0) {
> + dev_err(dev, "SPI read failed: %d\n", ret);
This error message sounds a bit to general, it's the initial check for
the chip via SPI.
> + return ret;
> + }
> +
> + ret = adin1110_write_reg(priv, ADIN1110_RESET, ADIN1110_SWRESET);
> + if (ret < 0)
> + return ret;
> +
> + ret = adin1110_register_mdiobus(priv, dev);
> + if (ret < 0) {
> + dev_err(dev, "Could not register MDIO bus %d\n", ret);
> + return ret;
> + }
> +
> + return adin1110_probe_netdevs(priv);
> +}
> +
> +static const struct of_device_id adin1110_match_table[] = {
> + { .compatible = "adi,adin1110" },
> + { .compatible = "adi,adin2111" },
> + { }
> +};
> +MODULE_DEVICE_TABLE(of, adin1110_match_table);
> +
> +static const struct spi_device_id adin1110_spi_id[] = {
> + { .name = "adin1110", .driver_data = ADIN1110_MAC },
> + { .name = "adin2111", .driver_data = ADIN2111_MAC },
> + { }
> +};
> +
> +static struct spi_driver adin1110_driver = {
> + .driver = {
> + .name = "adin1110",
> + .of_match_table = adin1110_match_table,
> + },
> + .probe = adin1110_probe,
> + .id_table = adin1110_spi_id,
> +};
> +module_spi_driver(adin1110_driver);
> +
> +MODULE_DESCRIPTION("ADIN1110 Network driver");
> +MODULE_AUTHOR("Alexandru Tachici <alexandru.tachici@...log.com>");
> +MODULE_LICENSE("Dual BSD/GPL");
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