// SPDX-License-Identifier: GPL-2.0+
/*
* Microchip's LAN865x 10BASE-T1S MAC-PHY driver
*
* Author: Parthiban Veerasooran <[email protected]>
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/phy.h>
#include <linux/oa_tc6.h>
#define DRV_NAME "lan8650"
/* MAC Network Control Register */
#define LAN865X_REG_MAC_NET_CTL 0x00010000
#define MAC_NET_CTL_TXEN BIT(3) /* Transmit Enable */
#define MAC_NET_CTL_RXEN BIT(2) /* Receive Enable */
/* MAC Network Configuration Reg */
#define LAN865X_REG_MAC_NET_CFG 0x00010001
#define MAC_NET_CFG_PROMISCUOUS_MODE BIT(4)
#define MAC_NET_CFG_MULTICAST_MODE BIT(6)
#define MAC_NET_CFG_UNICAST_MODE BIT(7)
/* MAC Hash Register Bottom */
#define LAN865X_REG_MAC_L_HASH 0x00010020
/* MAC Hash Register Top */
#define LAN865X_REG_MAC_H_HASH 0x00010021
/* MAC Specific Addr 1 Bottom Reg */
#define LAN865X_REG_MAC_L_SADDR1 0x00010022
/* MAC Specific Addr 1 Top Reg */
#define LAN865X_REG_MAC_H_SADDR1 0x00010023
struct lan865x_priv {
struct work_struct multicast_work;
struct net_device *netdev;
struct spi_device *spi;
struct oa_tc6 *tc6;
};
static int lan865x_set_hw_macaddr_low_bytes(struct oa_tc6 *tc6, const u8 *mac)
{
u32 regval;
regval = (mac[3] << 24) | (mac[2] << 16) | (mac[1] << 8) | mac[0];
return oa_tc6_write_register(tc6, LAN865X_REG_MAC_L_SADDR1, regval);
}
static int lan865x_set_hw_macaddr(struct lan865x_priv *priv, const u8 *mac)
{
int restore_ret;
u32 regval;
int ret;
/* Configure MAC address low bytes */
ret = lan865x_set_hw_macaddr_low_bytes(priv->tc6, mac);
if (ret)
return ret;
/* Prepare and configure MAC address high bytes */
regval = (mac[5] << 8) | mac[4];
ret = oa_tc6_write_register(priv->tc6, LAN865X_REG_MAC_H_SADDR1,
regval);
if (!ret)
return 0;
/* Restore the old MAC address low bytes from netdev if the new MAC
* address high bytes setting failed.
*/
restore_ret = lan865x_set_hw_macaddr_low_bytes(priv->tc6,
priv->netdev->dev_addr);
if (restore_ret)
return restore_ret;
return ret;
}
static const struct ethtool_ops lan865x_ethtool_ops = {
.get_link_ksettings = phy_ethtool_get_link_ksettings,
.set_link_ksettings = phy_ethtool_set_link_ksettings,
};
static int lan865x_set_mac_address(struct net_device *netdev, void *addr)
{
struct lan865x_priv *priv = netdev_priv(netdev);
struct sockaddr *address = addr;
int ret;
ret = eth_prepare_mac_addr_change(netdev, addr);
if (ret < 0)
return ret;
if (ether_addr_equal(address->sa_data, netdev->dev_addr))
return 0;
ret = lan865x_set_hw_macaddr(priv, address->sa_data);
if (ret)
return ret;
eth_commit_mac_addr_change(netdev, addr);
return 0;
}
static u32 get_address_bit(u8 addr[ETH_ALEN], u32 bit)
{
return ((addr[bit / 8]) >> (bit % 8)) & 1;
}
static u32 lan865x_hash(u8 addr[ETH_ALEN])
{
u32 hash_index = 0;
for (int i = 0; i < 6; i++) {
u32 hash = 0;
for (int j = 0; j < 8; j++)
hash ^= get_address_bit(addr, (j * 6) + i);
hash_index |= (hash << i);
}
return hash_index;
}
static int lan865x_set_specific_multicast_addr(struct lan865x_priv *priv)
{
struct netdev_hw_addr *ha;
u32 hash_lo = 0;
u32 hash_hi = 0;
int ret;
netdev_for_each_mc_addr(ha, priv->netdev) {
u32 bit_num = lan865x_hash(ha->addr);
if (bit_num >= BIT(5))
hash_hi |= (1 << (bit_num - BIT(5)));
else
hash_lo |= (1 << bit_num);
}
/* Enabling specific multicast addresses */
ret = oa_tc6_write_register(priv->tc6, LAN865X_REG_MAC_H_HASH, hash_hi);
if (ret) {
netdev_err(priv->netdev, "Failed to write reg_hashh: %d\n",
ret);
return ret;
}
ret = oa_tc6_write_register(priv->tc6, LAN865X_REG_MAC_L_HASH, hash_lo);
if (ret)
netdev_err(priv->netdev, "Failed to write reg_hashl: %d\n",
ret);
return ret;
}
static int lan865x_set_all_multicast_addr(struct lan865x_priv *priv)
{
int ret;
/* Enabling all multicast addresses */
ret = oa_tc6_write_register(priv->tc6, LAN865X_REG_MAC_H_HASH,
0xffffffff);
if (ret) {
netdev_err(priv->netdev, "Failed to write reg_hashh: %d\n",
ret);
return ret;
}
ret = oa_tc6_write_register(priv->tc6, LAN865X_REG_MAC_L_HASH,
0xffffffff);
if (ret)
netdev_err(priv->netdev, "Failed to write reg_hashl: %d\n",
ret);
return ret;
}
static int lan865x_clear_all_multicast_addr(struct lan865x_priv *priv)
{
int ret;
ret = oa_tc6_write_register(priv->tc6, LAN865X_REG_MAC_H_HASH, 0);
if (ret) {
netdev_err(priv->netdev, "Failed to write reg_hashh: %d\n",
ret);
return ret;
}
ret = oa_tc6_write_register(priv->tc6, LAN865X_REG_MAC_L_HASH, 0);
if (ret)
netdev_err(priv->netdev, "Failed to write reg_hashl: %d\n",
ret);
return ret;
}
static void lan865x_multicast_work_handler(struct work_struct *work)
{
struct lan865x_priv *priv = container_of(work, struct lan865x_priv,
multicast_work);
u32 regval = 0;
int ret;
if (priv->netdev->flags & IFF_PROMISC) {
/* Enabling promiscuous mode */
regval |= MAC_NET_CFG_PROMISCUOUS_MODE;
regval &= (~MAC_NET_CFG_MULTICAST_MODE);
regval &= (~MAC_NET_CFG_UNICAST_MODE);
} else if (priv->netdev->flags & IFF_ALLMULTI) {
/* Enabling all multicast mode */
if (lan865x_set_all_multicast_addr(priv))
return;
regval &= (~MAC_NET_CFG_PROMISCUOUS_MODE);
regval |= MAC_NET_CFG_MULTICAST_MODE;
regval &= (~MAC_NET_CFG_UNICAST_MODE);
} else if (!netdev_mc_empty(priv->netdev)) {
/* Enabling specific multicast mode */
if (lan865x_set_specific_multicast_addr(priv))
return;
regval &= (~MAC_NET_CFG_PROMISCUOUS_MODE);
regval |= MAC_NET_CFG_MULTICAST_MODE;
regval &= (~MAC_NET_CFG_UNICAST_MODE);
} else {
/* Enabling local mac address only */
if (lan865x_clear_all_multicast_addr(priv))
return;
}
ret = oa_tc6_write_register(priv->tc6, LAN865X_REG_MAC_NET_CFG, regval);
if (ret)
netdev_err(priv->netdev, "Failed to enable promiscuous/multicast/normal mode: %d\n",
ret);
}
static void lan865x_set_multicast_list(struct net_device *netdev)
{
struct lan865x_priv *priv = netdev_priv(netdev);
schedule_work(&priv->multicast_work);
}
static netdev_tx_t lan865x_send_packet(struct sk_buff *skb,
struct net_device *netdev)
{
struct lan865x_priv *priv = netdev_priv(netdev);
return oa_tc6_start_xmit(priv->tc6, skb);
}
static int lan865x_hw_disable(struct lan865x_priv *priv)
{
u32 regval;
if (oa_tc6_read_register(priv->tc6, LAN865X_REG_MAC_NET_CTL, ®val))
return -ENODEV;
regval &= ~(MAC_NET_CTL_TXEN | MAC_NET_CTL_RXEN);
if (oa_tc6_write_register(priv->tc6, LAN865X_REG_MAC_NET_CTL, regval))
return -ENODEV;
return 0;
}
static int lan865x_net_close(struct net_device *netdev)
{
struct lan865x_priv *priv = netdev_priv(netdev);
int ret;
netif_stop_queue(netdev);
phy_stop(netdev->phydev);
ret = lan865x_hw_disable(priv);
if (ret) {
netdev_err(netdev, "Failed to disable the hardware: %d\n", ret);
return ret;
}
return 0;
}
static int lan865x_hw_enable(struct lan865x_priv *priv)
{
u32 regval;
if (oa_tc6_read_register(priv->tc6, LAN865X_REG_MAC_NET_CTL, ®val))
return -ENODEV;
regval |= MAC_NET_CTL_TXEN | MAC_NET_CTL_RXEN;
if (oa_tc6_write_register(priv->tc6, LAN865X_REG_MAC_NET_CTL, regval))
return -ENODEV;
return 0;
}
static int lan865x_net_open(struct net_device *netdev)
{
struct lan865x_priv *priv = netdev_priv(netdev);
int ret;
ret = lan865x_hw_enable(priv);
if (ret) {
netdev_err(netdev, "Failed to enable hardware: %d\n", ret);
return ret;
}
phy_start(netdev->phydev);
return 0;
}
static const struct net_device_ops lan865x_netdev_ops = {
.ndo_open = lan865x_net_open,
.ndo_stop = lan865x_net_close,
.ndo_start_xmit = lan865x_send_packet,
.ndo_set_rx_mode = lan865x_set_multicast_list,
.ndo_set_mac_address = lan865x_set_mac_address,
};
static int lan865x_probe(struct spi_device *spi)
{
struct net_device *netdev;
struct lan865x_priv *priv;
int ret;
netdev = alloc_etherdev(sizeof(struct lan865x_priv));
if (!netdev)
return -ENOMEM;
priv = netdev_priv(netdev);
priv->netdev = netdev;
priv->spi = spi;
spi_set_drvdata(spi, priv);
INIT_WORK(&priv->multicast_work, lan865x_multicast_work_handler);
priv->tc6 = oa_tc6_init(spi, netdev);
if (!priv->tc6) {
ret = -ENODEV;
goto free_netdev;
}
/* As per the point s3 in the below errata, SPI receive Ethernet frame
* transfer may halt when starting the next frame in the same data block
* (chunk) as the end of a previous frame. The RFA field should be
* configured to 01b or 10b for proper operation. In these modes, only
* one receive Ethernet frame will be placed in a single data block.
* When the RFA field is written to 01b, received frames will be forced
* to only start in the first word of the data block payload (SWO=0). As
* recommended, enable zero align receive frame feature for proper
* operation.
*
* https://ww1.microchip.com/downloads/aemDocuments/documents/AIS/ProductDocuments/Errata/LAN8650-1-Errata-80001075.pdf
*/
ret = oa_tc6_zero_align_receive_frame_enable(priv->tc6);
if (ret) {
dev_err(&spi->dev, "Failed to set ZARFE: %d\n", ret);
goto oa_tc6_exit;
}
/* Get the MAC address from the SPI device tree node */
if (device_get_ethdev_address(&spi->dev, netdev))
eth_hw_addr_random(netdev);
ret = lan865x_set_hw_macaddr(priv, netdev->dev_addr);
if (ret) {
dev_err(&spi->dev, "Failed to configure MAC: %d\n", ret);
goto oa_tc6_exit;
}
netdev->if_port = IF_PORT_10BASET;
netdev->irq = spi->irq;
netdev->netdev_ops = &lan865x_netdev_ops;
netdev->ethtool_ops = &lan865x_ethtool_ops;
ret = register_netdev(netdev);
if (ret) {
dev_err(&spi->dev, "Register netdev failed (ret = %d)", ret);
goto oa_tc6_exit;
}
return 0;
oa_tc6_exit:
oa_tc6_exit(priv->tc6);
free_netdev:
free_netdev(priv->netdev);
return ret;
}
static void lan865x_remove(struct spi_device *spi)
{
struct lan865x_priv *priv = spi_get_drvdata(spi);
cancel_work_sync(&priv->multicast_work);
unregister_netdev(priv->netdev);
oa_tc6_exit(priv->tc6);
free_netdev(priv->netdev);
}
static const struct spi_device_id spidev_spi_ids[] = {
{ .name = "lan8650" },
{},
};
static const struct of_device_id lan865x_dt_ids[] = {
{ .compatible = "microchip,lan8650" },
{ /* Sentinel */ }
};
MODULE_DEVICE_TABLE(of, lan865x_dt_ids);
static struct spi_driver lan865x_driver = {
.driver = {
.name = DRV_NAME,
.of_match_table = lan865x_dt_ids,
},
.probe = lan865x_probe,
.remove = lan865x_remove,
.id_table = spidev_spi_ids,
};
module_spi_driver(lan865x_driver);
MODULE_DESCRIPTION(DRV_NAME " 10Base-T1S MACPHY Ethernet Driver");
MODULE_AUTHOR("Parthiban Veerasooran <[email protected]>");
MODULE_LICENSE("GPL");
Codebase Browser
linux