path: root/drivers/net/ethernet/asix/ax88796c_main.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2010 ASIX Electronics Corporation
 * Copyright (c) 2020 Samsung Electronics Co., Ltd.
 *
 * ASIX AX88796C SPI Fast Ethernet Linux driver
 */

#define pr_fmt(fmt)	"ax88796c: " fmt

#include "ax88796c_main.h"
#include "ax88796c_ioctl.h"

#include <linux/bitmap.h>
#include <linux/etherdevice.h>
#include <linux/iopoll.h>
#include <linux/lockdep.h>
#include <linux/mdio.h>
#include <linux/minmax.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/of.h>
#include <linux/phy.h>
#include <linux/skbuff.h>
#include <linux/spi/spi.h>

static int comp = IS_ENABLED(CONFIG_SPI_AX88796C_COMPRESSION);
static int msg_enable = NETIF_MSG_PROBE |
			NETIF_MSG_LINK |
			NETIF_MSG_RX_ERR |
			NETIF_MSG_TX_ERR;

static const char *no_regs_list = "80018001,e1918001,8001a001,fc0d0000";
unsigned long ax88796c_no_regs_mask[AX88796C_REGDUMP_LEN / (sizeof(unsigned long) * 8)];

module_param(msg_enable, int, 0444);
MODULE_PARM_DESC(msg_enable, "Message mask (see linux/netdevice.h for bitmap)");

static int ax88796c_soft_reset(struct ax88796c_device *ax_local)
{
	u16 temp;
	int ret;

	lockdep_assert_held(&ax_local->spi_lock);

	AX_WRITE(&ax_local->ax_spi, PSR_RESET, P0_PSR);
	AX_WRITE(&ax_local->ax_spi, PSR_RESET_CLR, P0_PSR);

	ret = read_poll_timeout(AX_READ, ret,
				(ret & PSR_DEV_READY),
				0, jiffies_to_usecs(160 * HZ / 1000), false,
				&ax_local->ax_spi, P0_PSR);
	if (ret)
		return ret;

	temp = AX_READ(&ax_local->ax_spi, P4_SPICR);
	if (ax_local->priv_flags & AX_CAP_COMP) {
		AX_WRITE(&ax_local->ax_spi,
			 (temp | SPICR_RCEN | SPICR_QCEN), P4_SPICR);
		ax_local->ax_spi.comp = 1;
	} else {
		AX_WRITE(&ax_local->ax_spi,
			 (temp & ~(SPICR_RCEN | SPICR_QCEN)), P4_SPICR);
		ax_local->ax_spi.comp = 0;
	}

	return 0;
}

static int ax88796c_reload_eeprom(struct ax88796c_device *ax_local)
{
	int ret;

	lockdep_assert_held(&ax_local->spi_lock);

	AX_WRITE(&ax_local->ax_spi, EECR_RELOAD, P3_EECR);

	ret = read_poll_timeout(AX_READ, ret,
				(ret & PSR_DEV_READY),
				0, jiffies_to_usecs(2 * HZ / 1000), false,
				&ax_local->ax_spi, P0_PSR);
	if (ret) {
		dev_err(&ax_local->spi->dev,
			"timeout waiting for reload eeprom\n");
		return ret;
	}

	return 0;
}

static void ax88796c_set_hw_multicast(struct net_device *ndev)
{
	struct ax88796c_device *ax_local = to_ax88796c_device(ndev);
	int mc_count = netdev_mc_count(ndev);
	u16 rx_ctl = RXCR_AB;

	lockdep_assert_held(&ax_local->spi_lock);

	memset(ax_local->multi_filter, 0, AX_MCAST_FILTER_SIZE);

	if (ndev->flags & IFF_PROMISC) {
		rx_ctl |= RXCR_PRO;

	} else if (ndev->flags & IFF_ALLMULTI || mc_count > AX_MAX_MCAST) {
		rx_ctl |= RXCR_AMALL;

	} else if (mc_count == 0) {
		/* just broadcast and directed */
	} else {
		u32 crc_bits;
		int i;
		struct netdev_hw_addr *ha;

		netdev_for_each_mc_addr(ha, ndev) {
			crc_bits = ether_crc(ETH_ALEN, ha->addr);
			ax_local->multi_filter[crc_bits >> 29] |=
						(1 << ((crc_bits >> 26) & 7));
		}

		for (i = 0; i < 4; i++) {
			AX_WRITE(&ax_local->ax_spi,
				 ((ax_local->multi_filter[i * 2 + 1] << 8) |
				  ax_local->multi_filter[i * 2]), P3_MFAR(i));
		}
	}

	AX_WRITE(&ax_local->ax_spi, rx_ctl, P2_RXCR);
}

static void ax88796c_set_mac_addr(struct net_device<