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// SPDX-License-Identifier: GPL-2.0
/* Copyright Sunplus Technology Co., Ltd.
* All rights reserved.
*/
#include <linux/platform_device.h>
#include <linux/nvmem-consumer.h>
#include <linux/etherdevice.h>
#include <linux/netdevice.h>
#include <linux/spinlock.h>
#include <linux/of_net.h>
#include <linux/reset.h>
#include <linux/clk.h>
#include <linux/of.h>
#include "spl2sw_register.h"
#include "spl2sw_define.h"
#include "spl2sw_desc.h"
#include "spl2sw_mdio.h"
#include "spl2sw_phy.h"
#include "spl2sw_int.h"
#include "spl2sw_mac.h"
/* net device operations */
static int spl2sw_ethernet_open(struct net_device *ndev)
{
struct spl2sw_mac *mac = netdev_priv(ndev);
struct spl2sw_common *comm = mac->comm;
u32 mask;
netdev_dbg(ndev, "Open port = %x\n", mac->lan_port);
comm->enable |= mac->lan_port;
spl2sw_mac_hw_start(comm);
/* Enable TX and RX interrupts */
mask = readl(comm->l2sw_reg_base + L2SW_SW_INT_MASK_0);
mask &= ~(MAC_INT_TX | MAC_INT_RX);
writel(mask, comm->l2sw_reg_base + L2SW_SW_INT_MASK_0);
phy_start(ndev->phydev);
netif_start_queue(ndev);
return 0;
}
static int spl2sw_ethernet_stop(struct net_device *ndev)
{
struct spl2sw_mac *mac = netdev_priv(ndev);
struct spl2sw_common *comm = mac->comm;
netif_stop_queue(ndev);
comm->enable &= ~mac->lan_port;
phy_stop(ndev->phydev);
spl2sw_mac_hw_stop(comm);
return 0;
}
static int spl2sw_ethernet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
{
struct spl2sw_mac *mac = netdev_priv(ndev);
struct spl2sw_common *comm = mac->comm;
struct spl2sw_skb_info *skbinfo;
struct spl2sw_mac_desc *txdesc;
unsigned long flags;
u32 mapping;
u32 tx_pos;
u32 cmd1;
u32 cmd2;
if (unlikely(comm->tx_desc_full == 1)) {
/* No TX descriptors left. Wait for tx interrupt. */
netdev_dbg(ndev, "TX descriptor queue full when xmit!\n");
return NETDEV_TX_BUSY;
}
/* If skb size is shorter than ETH_ZLEN (60), pad it with 0. */
if (unlikely(skb->len < ETH_ZLEN)) {
if (skb_padto(skb, ETH_ZLEN))
return NETDEV_TX_OK;
skb_put(skb, ETH_ZLEN - skb->len);
}
mapping = dma_map_single(&comm->pdev->dev, skb->data,
skb->len, DMA_TO_DEVICE);
if (dma_mapping_error(&comm->pdev->dev, mapping)) {
ndev->stats.tx_errors++;
dev_kfree_skb(skb);
return NETDEV_TX_OK;
}
spin_lock_irqsave(&comm->tx_lock, flags);
tx_pos = comm->tx_pos;
txdesc = &comm->tx_desc[tx_pos];
skbinfo = &comm->tx_temp_skb_info[tx_pos];
skbinfo->mapping = mapping;
skbinfo->len = skb->len;
skbinfo->skb = skb;
/* Set up a TX descriptor */
cmd1 = TXD_OWN | TXD_SOP | TXD_EOP | (mac->to_vlan << 12) |
(skb->len & TXD_PKT_LEN);
cmd2 = skb->len & TXD_BUF_LEN1;
if (tx_pos == (TX_DESC_NUM - 1))
cmd2 |= TXD_EOR;
txdesc->addr1 = skbinfo->mapping;
txdesc->cmd2 = cmd2;
wmb(); /* Set TXD_OWN after other fields are effective. */
txdesc->cmd1 = cmd1;
/* Move tx_pos to next position */
tx_pos = ((tx_pos + 1) == TX_DESC_NUM) ? 0 : tx_pos + 1;
if (unlikely(tx_pos == comm->tx_done_pos)) {
netif_stop_queue(ndev);
comm->tx_desc_full = 1;
}
comm->tx_pos = tx_pos;
wmb(); /* make sure settings are effective. */
/* Trigger mac to transmit */
writel(MAC_TRIG_L_SOC0, comm->l2sw_reg_base + L2SW_CPU_TX_TRIG);
spin_unlock_irqrestore(&comm->tx_lock, flags);
return NETDEV_TX_OK;
}
static void spl2sw_ethernet_set_rx_mode(struct net_device *ndev)
{
struct spl2sw_mac *mac = netdev_priv(ndev);
spl2sw_mac_rx_mode_set(mac);
}
static int spl2sw_ethernet_set_mac_address(struct net_device *ndev, void *addr)
{
struct spl2sw_mac *mac = netdev_priv(ndev);
int err;
err = eth_mac_addr(ndev, addr);
if (err)
return err;
/* Delete the old MAC address */
netdev_dbg(ndev, "Old Ethernet (MAC) address = %pM\n", mac->mac_addr);
if (is_valid_ether_addr(mac->mac_addr)) {
err = spl2sw_mac_addr_del(mac);
if (err)
return err;
}
/* Set the MAC address */
ether_addr_copy(mac->mac_addr, ndev->dev_addr);
return spl2sw_mac_addr_add(mac);
}
static void spl2sw_ethernet_tx_timeout(struct net_device *ndev, unsigned int txqueue)
{
struct spl2sw_mac *mac = netdev_priv(ndev);
struct spl2sw_common *comm = mac->comm;
unsigned long flags;
int i;
netdev_err(ndev, "TX timed out!\n");
ndev->stats.tx_errors++;
spin_lock_irqsave(&comm->tx_lock, flags);
for (i = 0; i < MAX_NETDEV_NUM; i++)
if (comm->ndev[i])
netif_stop_queue(comm->ndev[i]);
spl2sw_mac_soft_reset(comm);
/* Accept TX packets again. */
for (i = 0; i < MAX_NETDEV_NUM; i++)
if (comm->ndev[i]) {
netif_trans_update(comm->ndev[i]);
netif_wake_queue(comm->ndev[i]);
}
spin_unlock_irqrestore(&comm->tx_lock, flags);
}
static const struct net_device_ops netdev_ops = {
.ndo_open = spl2sw_ethernet_open,
.ndo_stop = spl2sw_ethernet_stop,
.ndo_start_xmit = spl2sw_ethernet_start_xmit,
.ndo_set_rx_mode = spl2sw_ethernet_set_rx_mode,
.ndo_set_mac_address = spl2sw_ethernet_set_mac_address,
.ndo_do_ioctl = phy_do_ioctl,
.ndo_tx_timeout = spl2sw_ethernet_tx_timeout,
};
static void spl2sw_check_mac_vendor_id_and_convert(u8 *mac_addr)
{
/* Byte order of MAC address of some samples are reversed.
* Check vendor id and convert byte order if it is wrong.
* OUI of Sunplus: fc:4b:bc
*/
if (mac_addr[5] == 0xfc && mac_addr[4] == 0x4b && mac_addr[3] == 0xbc &&
(mac_addr[0] != 0xfc || mac_addr[1] != 0x4b || mac_addr[2] != 0xbc)) {
swap(mac_addr[0], mac_addr[5]);
swap(mac_addr[1], mac_addr[4]);
swap(mac_addr[2], mac_addr[3]);
}
}
static int spl2sw_nvmem_get_mac_address(struct device *dev, struct device_node *np,
void *addrbuf)
{
struct nvmem_cell *cell;
ssize_t len;
u8 *mac;
/* Get nvmem cell of mac-address from dts. */
cell = of_nvmem_cell_get(np, "mac-address");
if (IS_ERR(cell))
return PTR_ERR(cell);
/* Read mac address from nvmem cell. */
mac = nvmem_cell_read(cell, &len);
nvmem_cell_put(cell);
if (IS_ERR(mac))
return PTR_ERR(mac);
if (len != ETH_ALEN) {
kfree(mac);
dev_info(dev, "Invalid length of mac address in nvmem!\n");
return -EINVAL;
}
/* Byte order of some samples are reversed.
* Convert byte order here.
*/
spl2sw_check_mac_vendor_id_and_convert(mac);
/* Check if mac address is valid */
if (!is_valid_ether_addr(mac)) {
kfree(mac);
dev_info(dev, "Invalid mac address in nvmem (%pM)!\n", mac);
return -EINVAL;
}
ether_addr_copy(addrbuf, mac);
kfree(mac);
return 0;
}
static u32 spl2sw_init_netdev(struct platform_device *pdev, u8 *mac_addr,
struct net_device **r_ndev)
{
struct net_device *ndev;
struct spl2sw_mac *mac;
int ret;
/* Allocate the devices, and also allocate spl2sw_mac,
* we can get it by netdev_priv().
*/
ndev = devm_alloc_etherdev(&pdev->dev, sizeof(*mac));
if (!ndev) {
*r_ndev = NULL;
return -ENOMEM;
}
SET_NETDEV_DEV(ndev, &pdev->dev);
ndev->netdev_ops = &netdev_ops;
mac = netdev_priv(ndev);
mac->ndev = ndev;
ether_addr_copy(mac->mac_addr, mac_addr);
eth_hw_addr_set(ndev, mac_addr);
dev_info(&pdev->dev, "Ethernet (MAC) address = %pM\n", mac_addr);
ret = register_netdev(ndev);
if (ret) {
dev_err(&pdev->dev, "Failed to register net device \"%s\"!\n",
ndev->name);
free_netdev(ndev);
*r_ndev = NULL;
return ret;
}
netdev_dbg(ndev, "Registered net device \"%s\" successfully.\n", ndev->name);
*r_ndev = ndev;
return 0;
}
static struct device_node *spl2sw_get_eth_child_node(struct device_node *ether_np, int id)
{
struct device_node *port_np;
int port_id;
for_each_child_of_node(ether_np, port_np) {
/* It is not a 'port' node, continue. */
if (strcmp(port_np->name, "port"))
continue;
if (of_property_read_u32(port_np, "reg", &port_id) < 0)
continue;
if (port_id == id)
return port_np;
}
/* Not found! */
return NULL;
}
static int spl2sw_probe(struct platform_device *pdev)
{
struct device_node *eth_ports_np;
struct device_node *port_np;
struct spl2sw_common *comm;
struct device_node *phy_np;
phy_interface_t phy_mode;
struct net_device *ndev;
struct spl2sw_mac *mac;
u8 mac_addr[ETH_ALEN];
int irq, i, ret;
if (platform_get_drvdata(pdev))
return -ENODEV;
/* Allocate memory for 'spl2sw_common' area. */
comm = devm_kzalloc(&pdev->dev, sizeof(*comm), GFP_KERNEL);
if (!comm)
return -ENOMEM;
comm->pdev = pdev;
platform_set_drvdata(pdev, comm);
spin_lock_init(&comm->tx_lock);
spin_lock_init(&comm->mdio_lock);
spin_lock_init(&comm->int_mask_lock);
/* Get memory resource 0 from dts. */
comm->l2sw_reg_base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(comm->l2sw_reg_base))
return PTR_ERR(comm->l2sw_reg_base);
/* Get irq resource from dts. */
ret = platform_get_irq(pdev, 0);
if (ret < 0)
return ret;
irq = ret;
/* Get clock controller. */
comm->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(comm->clk)) {
dev_err_probe(&pdev->dev, PTR_ERR(comm->clk),
"Failed to retrieve clock controller!\n");
return PTR_ERR(comm->clk);
}
/* Get reset controller. */
comm->rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL);
if (IS_ERR(comm->rstc)) {
dev_err_probe(&pdev->dev, PTR_ERR(comm->rstc),
"Failed to retrieve reset controller!\n");
return PTR_ERR(comm->rstc);
}
/* Enable clock. */
ret = clk_prepare_enable(comm->clk);
if (ret)
return ret;
udelay(1);
/* Reset MAC */
reset_control_assert(comm->rstc);
udelay(1);
reset_control_deassert(comm->rstc);
usleep_range(1000, 2000);
/* Request irq. */
ret = devm_request_irq(&pdev->dev, irq, spl2sw_ethernet_interrupt, 0,
dev_name(&pdev->dev), comm);
if (ret) {
dev_err(&pdev->dev, "Failed to request irq #%d!\n", irq);
goto out_clk_disable;
}
/* Initialize TX and RX descriptors. */
ret = spl2sw_descs_init(comm);
if (ret) {
dev_err(&pdev->dev, "Fail to initialize mac descriptors!\n");
spl2sw_descs_free(comm);
goto out_clk_disable;
}
/* Initialize MAC. */
spl2sw_mac_init(comm);
/* Initialize mdio bus */
ret = spl2sw_mdio_init(comm);
if (ret) {
dev_err(&pdev->dev, "Failed to initialize mdio bus!\n");
goto out_clk_disable;
}
/* Get child node ethernet-ports. */
eth_ports_np = of_get_child_by_name(pdev->dev.of_node, "ethernet-ports");
if (!eth_ports_np) {
dev_err(&pdev->dev, "No ethernet-ports child node found!\n");
ret = -ENODEV;
goto out_free_mdio;
}
for (i = 0; i < MAX_NETDEV_NUM; i++) {
/* Get port@i of node ethernet-ports. */
port_np = spl2sw_get_eth_child_node(eth_ports_np, i);
if (!port_np)
continue;
/* Get phy-mode. */
if (of_get_phy_mode(port_np, &phy_mode)) {
dev_err(&pdev->dev, "Failed to get phy-mode property of port@%d!\n",
i);
continue;
}
/* Get phy-handle. */
phy_np = of_parse_phandle(port_np, "phy-handle", 0);
if (!phy_np) {
dev_err(&pdev->dev, "Failed to get phy-handle property of port@%d!\n",
i);
continue;
}
/* Get mac-address from nvmem. */
ret = spl2sw_nvmem_get_mac_address(&pdev->dev, port_np, mac_addr);
if (ret == -EPROBE_DEFER) {
goto out_unregister_dev;
} else if (ret) {
dev_info(&pdev->dev, "Generate a random mac address!\n");
eth_random_addr(mac_addr);
}
/* Initialize the net device. */
ret = spl2sw_init_netdev(pdev, mac_addr, &ndev);
if (ret)
goto out_unregister_dev;
ndev->irq = irq;
comm->ndev[i] = ndev;
mac = netdev_priv(ndev);
mac->phy_node = phy_np;
mac->phy_mode = phy_mode;
mac->comm = comm;
mac->lan_port = 0x1 << i; /* forward to port i */
mac->to_vlan = 0x1 << i; /* vlan group: i */
mac->vlan_id = i; /* vlan group: i */
/* Set MAC address */
ret = spl2sw_mac_addr_add(mac);
if (ret)
goto out_unregister_dev;
spl2sw_mac_rx_mode_set(mac);
}
/* Find first valid net device. */
for (i = 0; i < MAX_NETDEV_NUM; i++) {
if (comm->ndev[i])
break;
}
if (i >= MAX_NETDEV_NUM) {
dev_err(&pdev->dev, "No valid ethernet port!\n");
ret = -ENODEV;
goto out_free_mdio;
}
/* Save first valid net device */
ndev = comm->ndev[i];
ret = spl2sw_phy_connect(comm);
if (ret) {
netdev_err(ndev, "Failed to connect phy!\n");
goto out_unregister_dev;
}
/* Add and enable napi. */
netif_napi_add(ndev, &comm->rx_napi, spl2sw_rx_poll, NAPI_POLL_WEIGHT);
napi_enable(&comm->rx_napi);
netif_napi_add(ndev, &comm->tx_napi, spl2sw_tx_poll, NAPI_POLL_WEIGHT);
napi_enable(&comm->tx_napi);
return 0;
out_unregister_dev:
for (i = 0; i < MAX_NETDEV_NUM; i++)
if (comm->ndev[i])
unregister_netdev(comm->ndev[i]);
out_free_mdio:
spl2sw_mdio_remove(comm);
out_clk_disable:
clk_disable_unprepare(comm->clk);
return ret;
}
static int spl2sw_remove(struct platform_device *pdev)
{
struct spl2sw_common *comm;
int i;
comm = platform_get_drvdata(pdev);
spl2sw_phy_remove(comm);
/* Unregister and free net device. */
for (i = 0; i < MAX_NETDEV_NUM; i++)
if (comm->ndev[i])
unregister_netdev(comm->ndev[i]);
comm->enable = 0;
spl2sw_mac_hw_stop(comm);
spl2sw_descs_free(comm);
/* Disable and delete napi. */
napi_disable(&comm->rx_napi);
netif_napi_del(&comm->rx_napi);
napi_disable(&comm->tx_napi);
netif_napi_del(&comm->tx_napi);
spl2sw_mdio_remove(comm);
clk_disable_unprepare(comm->clk);
return 0;
}
static const struct of_device_id spl2sw_of_match[] = {
{.compatible = "sunplus,sp7021-emac"},
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, spl2sw_of_match);
static struct platform_driver spl2sw_driver = {
.probe = spl2sw_probe,
.remove = spl2sw_remove,
.driver = {
.name = "sp7021_emac",
.of_match_table = spl2sw_of_match,
},
};
module_platform_driver(spl2sw_driver);
MODULE_AUTHOR("Wells Lu <wellslutw@gmail.com>");
MODULE_DESCRIPTION("Sunplus Dual 10M/100M Ethernet driver");
MODULE_LICENSE("GPL");
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