path: root/drivers/net/ethernet/microchip/encx24j600.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Microchip ENCX24J600 ethernet driver
 *
 * Copyright (C) 2015 Gridpoint
 * Author: Jon Ringle <jringle@gridpoint.com>
 */

#include <linux/device.h>
#include <linux/errno.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/regmap.h>
#include <linux/skbuff.h>
#include <linux/spi/spi.h>

#include "encx24j600_hw.h"

#define DRV_NAME	"encx24j600"
#define DRV_VERSION	"1.0"

#define DEFAULT_MSG_ENABLE (NETIF_MSG_DRV | NETIF_MSG_PROBE | NETIF_MSG_LINK)
static int debug = -1;
module_param(debug, int, 0000);
MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");

/* SRAM memory layout:
 *
 * 0x0000-0x05ff TX buffers  1.5KB  (1*1536) reside in the GP area in SRAM
 * 0x0600-0x5fff RX buffers 22.5KB (15*1536) reside in the RX area in SRAM
 */
#define ENC_TX_BUF_START 0x0000U
#define ENC_RX_BUF_START 0x0600U
#define ENC_RX_BUF_END   0x5fffU
#define ENC_SRAM_SIZE    0x6000U

enum {
	RXFILTER_NORMAL,
	RXFILTER_MULTI,
	RXFILTER_PROMISC
};

struct encx24j600_priv {
	struct net_device        *ndev;
	struct mutex              lock; /* device access lock */
	struct encx24j600_context ctx;
	struct sk_buff           *tx_skb;
	struct task_struct       *kworker_task;
	struct kthread_worker     kworker;
	struct kthread_work       tx_work;
	struct kthread_work       setrx_work;
	u16                       next_packet;
	bool                      hw_enabled;
	bool                      full_duplex;
	bool                      autoneg;
	u16                       speed;
	int                       rxfilter;
	u32                       msg_enable;
};

static void dump_packet(const char *msg, int len, const char *data)
{
	pr_debug(DRV_NAME ": %s - packet len:%d\n", msg, len);
	print_hex_dump_bytes("pk data: ", DUMP_PREFIX_OFFSET, data, len);
}

static void encx24j600_dump_rsv(struct encx24j600_priv *priv, const char *msg,
				struct rsv *rsv)
{
	struct net_device *dev = priv->ndev;

	netdev_info(dev, "RX packet Len:%d\n", rsv->len);
	netdev_dbg(dev, "%s - NextPk: 0x%04x\n", msg,
		   rsv->next_packet);
	netdev_dbg(dev, "RxOK: %d, DribbleNibble: %d\n",
		   RSV_GETBIT(rsv->rxstat, RSV_RXOK),
		   RSV_GETBIT(rsv->rxstat, RSV_DRIBBLENIBBLE));
	netdev_dbg(dev, "CRCErr:%d, LenChkErr: %d, LenOutOfRange: %d\n",
		   RSV_GETBIT(rsv->rxstat, RSV_CRCERROR),
		   RSV_GETBIT(rsv->rxstat, RSV_LENCHECKERR),
		   RSV_GETBIT(rsv->rxstat, RSV_LENOUTOFRANGE));
	netdev_dbg(dev, "Multicast: %d, Broadcast: %d, LongDropEvent: %d, CarrierEvent: %d\n",
		   RSV_GETBIT(rsv->rxstat, RSV_RXMULTICAST),
		   RSV_GETBIT(rsv->rxstat, RSV_RXBROADCAST),
		   RSV_GETBIT(rsv->rxstat, RSV_RXLONGEVDROPEV),
		   RSV_GETBIT(rsv->rxstat, RSV_CARRIEREV));
	netdev_dbg(dev, "ControlFrame: %d, PauseFrame: %d, UnknownOp: %d, VLanTagFrame: %d\n",
		   RSV_GETBIT(rsv->rxstat, RSV_RXCONTROLFRAME),
		   RSV_GETBIT(rsv->rxstat, RSV_RXPAUSEFRAME),
		   RSV_GETBIT(rsv->rxstat, RSV_RXUNKNOWNOPCODE),
		   RSV_GETBIT(rsv->rxstat, RSV_RXTYPEVLAN));
}

static u16 encx24j600_read_reg(struct encx24j600_priv *priv, u8 reg)
{
	struct net_device *dev = priv->ndev;
	unsigned int val = 0;
	int ret = regmap_read(priv->ctx.regmap, reg, &val);

	if (unlikely(ret))
		netif_err(priv, drv, dev, "%s: error %d reading reg %02x\n",
			  __func__, ret, reg);
	return val;
}

static void encx24j600_write_reg(struct encx24j600_priv *priv, u8 reg, u16 val)
{
	struct net_device *dev = priv->ndev;
	int ret = regmap_write(priv->ctx.regmap, reg, val);

	if (unlikely(ret))
		netif_err(priv, drv, dev, "%s: error %d writing reg %02x=%04x\n",
			  __func__, ret, reg, val);
}

static void encx24j600_update_reg(struct encx24j600_priv *priv, u8 reg,
				  u16 mask, u16 val)
{
	struct net_device *dev = priv->ndev;
	int ret = regmap_update_bits(priv->ctx.regmap, reg, mask, val);

	if (unlikely(ret))
		netif_err(priv, drv, dev, "%s: error %d updating reg %02x=%04x~%04x\n",
			  __func__, ret, reg, val, mask);
}

static u16 encx24j600_read_phy(struct encx24j600_priv *priv, u8 reg)