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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2016-2017, National Instruments Corp.
*
* Author: Moritz Fischer <mdf@kernel.org>
*/
#include <linux/etherdevice.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/of_address.h>
#include <linux/of_mdio.h>
#include <linux/of_net.h>
#include <linux/of_platform.h>
#include <linux/of_irq.h>
#include <linux/skbuff.h>
#include <linux/phy.h>
#include <linux/mii.h>
#include <linux/nvmem-consumer.h>
#include <linux/ethtool.h>
#include <linux/iopoll.h>
#define TX_BD_NUM 64
#define RX_BD_NUM 128
/* Axi DMA Register definitions */
#define XAXIDMA_TX_CR_OFFSET 0x00 /* Channel control */
#define XAXIDMA_TX_SR_OFFSET 0x04 /* Status */
#define XAXIDMA_TX_CDESC_OFFSET 0x08 /* Current descriptor pointer */
#define XAXIDMA_TX_TDESC_OFFSET 0x10 /* Tail descriptor pointer */
#define XAXIDMA_RX_CR_OFFSET 0x30 /* Channel control */
#define XAXIDMA_RX_SR_OFFSET 0x34 /* Status */
#define XAXIDMA_RX_CDESC_OFFSET 0x38 /* Current descriptor pointer */
#define XAXIDMA_RX_TDESC_OFFSET 0x40 /* Tail descriptor pointer */
#define XAXIDMA_CR_RUNSTOP_MASK 0x1 /* Start/stop DMA channel */
#define XAXIDMA_CR_RESET_MASK 0x4 /* Reset DMA engine */
#define XAXIDMA_BD_CTRL_LENGTH_MASK 0x007FFFFF /* Requested len */
#define XAXIDMA_BD_CTRL_TXSOF_MASK 0x08000000 /* First tx packet */
#define XAXIDMA_BD_CTRL_TXEOF_MASK 0x04000000 /* Last tx packet */
#define XAXIDMA_BD_CTRL_ALL_MASK 0x0C000000 /* All control bits */
#define XAXIDMA_DELAY_MASK 0xFF000000 /* Delay timeout counter */
#define XAXIDMA_COALESCE_MASK 0x00FF0000 /* Coalesce counter */
#define XAXIDMA_DELAY_SHIFT 24
#define XAXIDMA_COALESCE_SHIFT 16
#define XAXIDMA_IRQ_IOC_MASK 0x00001000 /* Completion intr */
#define XAXIDMA_IRQ_DELAY_MASK 0x00002000 /* Delay interrupt */
#define XAXIDMA_IRQ_ERROR_MASK 0x00004000 /* Error interrupt */
#define XAXIDMA_IRQ_ALL_MASK 0x00007000 /* All interrupts */
/* Default TX/RX Threshold and waitbound values for SGDMA mode */
#define XAXIDMA_DFT_TX_THRESHOLD 24
#define XAXIDMA_DFT_TX_WAITBOUND 254
#define XAXIDMA_DFT_RX_THRESHOLD 24
#define XAXIDMA_DFT_RX_WAITBOUND 254
#define XAXIDMA_BD_STS_ACTUAL_LEN_MASK 0x007FFFFF /* Actual len */
#define XAXIDMA_BD_STS_COMPLETE_MASK 0x80000000 /* Completed */
#define XAXIDMA_BD_STS_DEC_ERR_MASK 0x40000000 /* Decode error */
#define XAXIDMA_BD_STS_SLV_ERR_MASK 0x20000000 /* Slave error */
#define XAXIDMA_BD_STS_INT_ERR_MASK 0x10000000 /* Internal err */
#define XAXIDMA_BD_STS_ALL_ERR_MASK 0x70000000 /* All errors */
#define XAXIDMA_BD_STS_RXSOF_MASK 0x08000000 /* First rx pkt */
#define XAXIDMA_BD_STS_RXEOF_MASK 0x04000000 /* Last rx pkt */
#define XAXIDMA_BD_STS_ALL_MASK 0xFC000000 /* All status bits */
#define NIXGE_REG_CTRL_OFFSET 0x4000
#define NIXGE_REG_INFO 0x00
#define NIXGE_REG_MAC_CTL 0x04
#define NIXGE_REG_PHY_CTL 0x08
#define NIXGE_REG_LED_CTL 0x0c
#define NIXGE_REG_MDIO_DATA 0x10
#define NIXGE_REG_MDIO_ADDR 0x14
#define NIXGE_REG_MDIO_OP 0x18
#define NIXGE_REG_MDIO_CTRL 0x1c
#define NIXGE_ID_LED_CTL_EN BIT(0)
#define NIXGE_ID_LED_CTL_VAL BIT(1)
#define NIXGE_MDIO_CLAUSE45 BIT(12)
#define NIXGE_MDIO_CLAUSE22 0
#define NIXGE_MDIO_OP(n) (((n) & 0x3) << 10)
#define NIXGE_MDIO_OP_ADDRESS 0
#define NIXGE_MDIO_C45_WRITE BIT(0)
#define NIXGE_MDIO_C45_READ (BIT(1) | BIT(0))
#define NIXGE_MDIO_C22_WRITE BIT(0)
#define NIXGE_MDIO_C22_READ BIT(1)
#define NIXGE_MDIO_ADDR(n) (((n) & 0x1f) << 5)
#define NIXGE_MDIO_MMD(n) (((n) & 0x1f) << 0)
#define NIXGE_REG_MAC_LSB 0x1000
#define NIXGE_REG_MAC_MSB 0x1004
/* Packet size info */
#define NIXGE_HDR_SIZE 14 /* Size of Ethernet header */
#define NIXGE_TRL_SIZE 4 /* Size of Ethernet trailer (FCS) */
#define NIXGE_MTU 1500 /* Max MTU of an Ethernet frame */
#define NIXGE_JUMBO_MTU 9000 /* Max MTU of a jumbo Eth. frame */
#define NIXGE_MAX_FRAME_SIZE (NIXGE_MTU + NIXGE_HDR_SIZE + NIXGE_TRL_SIZE)
#define NIXGE_MAX_JUMBO_FRAME_SIZE \
(NIXGE_JUMBO_MTU + NIXGE_HDR_SIZE + NIXGE_TRL_SIZE)
enum nixge_version {
NIXGE_V2,
NIXGE_V3,
NIXGE_VERSION_COUNT
};
struct nixge_hw_dma_bd {
u32 next_lo;
u32 next_hi;
u32 phys_lo;
u32 phys_hi;
u32 reserved3;
u32 reserved4;
u32 cntrl;
u32 status;
u32 app0;
u32 app1;
u32 app2;
u32 app3;
u32 app4;
u32 sw_id_offset_lo;
u32 sw_id_offset_hi;
u32 reserved6;
};
#ifdef CONFIG_PHYS_ADDR_T_64BIT
#define nixge_hw_dma_bd_set_addr(bd, field, addr) \
do { \
(bd)->field##_lo = lower_32_bits((addr)); \
(bd)->field##_hi = upper_32_bits((addr)); \
} while (0)
#else
#define nixge_hw_dma_bd_set_addr(bd, field, addr) \
((bd)->field##_lo = lower_32_bits((addr)))
#endif
#define nixge_hw_dma_bd_set_phys(bd, addr) \
nixge_hw_dma_bd_set_addr((bd), phys, (addr))
#define nixge_hw_dma_bd_set_next(bd, addr) \
nixge_hw_dma_bd_set_addr((bd), next, (addr))
#define nixge_hw_dma_bd_set_offset(bd, addr) \
nixge_hw_dma_bd_set_addr((bd), sw_id_offset, (addr))
#ifdef CONFIG_PHYS_ADDR_T_64BIT
#define nixge_hw_dma_bd_get_addr(bd, field) \
(dma_addr_t)((((u64)(bd)->field##_hi) << 32) | ((bd)->field##_lo))
#else
#define nixge_hw_dma_bd_get_addr(bd, field) \
(dma_addr_t)((bd)->field##_lo)
#endif
struct nixge_tx_skb {
struct sk_buff *skb;
dma_addr_t mapping;
size_t size;
bool mapped_as_page;
};
struct nixge_priv {
struct net_device *ndev;
struct napi_struct napi;
struct device *dev;
/* Connection to PHY device */
struct device_node *phy_node;
phy_interface_t phy_mode;
int link;
unsigned int speed;
unsigned int duplex;
/* MDIO bus data */
struct mii_bus *mii_bus; /* MII bus reference */
/* IO registers, dma functions and IRQs */
void __iomem *ctrl_regs;
void __iomem *dma_regs;
struct tasklet_struct dma_err_tasklet;
int tx_irq;
int rx_irq;
/* Buffer descriptors */
struct nixge_hw_dma_bd *tx_bd_v;
struct nixge_tx_skb *tx_skb;
dma_addr_t tx_bd_p;
struct nixge_hw_dma_bd *rx_bd_v;
dma_addr_t rx_bd_p;
u32 tx_bd_ci;
u32 tx_bd_tail;
u32 rx_bd_ci;
u32 coalesce_count_rx;
u32 coalesce_count_tx;
};
static void nixge_dma_write_reg(struct nixge_priv *priv, off_t offset, u32 val)
{
writel(val, priv->dma_regs + offset);
}
static void nixge_dma_write_desc_reg(struct nixge_priv *priv, off_t offset,
dma_addr_t addr)
{
writel(lower_32_bits(addr), priv->dma_regs + offset);
#ifdef CONFIG_PHYS_ADDR_T_64BIT
writel(upper_32_bits(addr), priv->dma_regs + offset + 4);
#endif
}
static u32 nixge_dma_read_reg(const struct nixge_priv *priv, off_t offset)
{
return readl(priv->dma_regs + offset);
}
static void nixge_ctrl_write_reg(struct nixge_priv *priv, off_t offset, u32 val)
{
writel(val, priv->ctrl_regs + offset);
}
static u32 nixge_ctrl_read_reg(struct nixge_priv *priv, off_t offset)
{
return readl(priv->ctrl_regs + offset);
}
#define nixge_ctrl_poll_timeout(priv, addr, val, cond, sleep_us, timeout_us) \
readl_poll_timeout((priv)->ctrl_regs + (addr), (val), (cond), \
(sleep_us), (timeout_us))
#define nixge_dma_poll_timeout(priv, addr, val, cond, sleep_us, timeout_us) \
readl_poll_timeout((priv)->dma_regs + (addr), (val), (cond), \
(sleep_us), (timeout_us))
static void nixge_hw_dma_bd_release(struct net_device *ndev)
{
struct nixge_priv *priv = netdev_priv(ndev);
dma_addr_t phys_addr;
struct sk_buff *skb;
int i;
for (i = 0; i < RX_BD_NUM; i++) {
phys_addr = nixge_hw_dma_bd_get_addr(&priv->rx_bd_v[i],
phys);
dma_unmap_single(ndev->dev.parent, phys_addr,
NIXGE_MAX_JUMBO_FRAME_SIZE,
DMA_FROM_DEVICE);
skb = (struct sk_buff *)(uintptr_t)
nixge_hw_dma_bd_get_addr(&priv->rx_bd_v[i],
sw_id_offset);
dev_kfree_skb(skb);
}
if (priv->rx_bd_v)
dma_free_coherent(ndev->dev.parent,
sizeof(*priv->rx_bd_v) * RX_BD_NUM,
priv->rx_bd_v,
priv->rx_bd_p);
if (priv->tx_skb)
devm_kfree(ndev->dev.parent, priv->tx_skb);
if (priv->tx_bd_v)
dma_free_coherent(ndev->dev.parent,
sizeof(*priv->tx_bd_v) * TX_BD_NUM,
priv->tx_bd_v,
priv->tx_bd_p);
}
static int nixge_hw_dma_bd_init(struct net_device *ndev)
{
struct nixge_priv *priv = netdev_priv(ndev);
struct sk_buff *skb;
dma_addr_t phys;
u32 cr;
int i;
/* Reset the indexes which are used for accessing the BDs */
priv->tx_bd_ci = 0;
priv->tx_bd_tail = 0;
priv->rx_bd_ci = 0;
/* Allocate the Tx and Rx buffer descriptors. */
priv->tx_bd_v = dma_alloc_coherent(ndev->dev.parent,
sizeof(*priv->tx_bd_v) * TX_BD_NUM,
&priv->tx_bd_p, GFP_KERNEL);
if (!priv->tx_bd_v)
goto out;
priv->tx_skb = devm_kcalloc(ndev->dev.parent,
TX_BD_NUM, sizeof(*priv->tx_skb),
GFP_KERNEL);
if (!priv->tx_skb)
goto out;
priv->rx_bd_v = dma_alloc_coherent(ndev->dev.parent,
sizeof(*priv->rx_bd_v) * RX_BD_NUM,
&priv->rx_bd_p, GFP_KERNEL);
if (!priv->rx_bd_v)
goto out;
for (i = 0; i < TX_BD_NUM; i++) {
nixge_hw_dma_bd_set_next(&priv->tx_bd_v[i],
priv->tx_bd_p +
sizeof(*priv->tx_bd_v) *
((i + 1) % TX_BD_NUM));
}
for (i = 0; i < RX_BD_NUM; i++) {
nixge_hw_dma_bd_set_next(&priv->rx_bd_v[i],
priv->rx_bd_p
+ sizeof(*priv->rx_bd_v) *
((i + 1) % RX_BD_NUM));
skb = netdev_alloc_skb_ip_align(ndev,
NIXGE_MAX_JUMBO_FRAME_SIZE);
if (!skb)
goto out;
nixge_hw_dma_bd_set_offset(&priv->rx_bd_v[i], (uintptr_t)skb);
phys = dma_map_single(ndev->dev.parent, skb->data,
NIXGE_MAX_JUMBO_FRAME_SIZE,
DMA_FROM_DEVICE);
nixge_hw_dma_bd_set_phys(&priv->rx_bd_v[i], phys);
priv->rx_bd_v[i].cntrl = NIXGE_MAX_JUMBO_FRAME_SIZE;
}
/* Start updating the Rx channel control register */
cr = nixge_dma_read_reg(priv, XAXIDMA_RX_CR_OFFSET);
/* Update the interrupt coalesce count */
cr = ((cr & ~XAXIDMA_COALESCE_MASK) |
((priv->coalesce_count_rx) << XAXIDMA_COALESCE_SHIFT));
/* Update the delay timer count */
cr = ((cr & ~XAXIDMA_DELAY_MASK) |
(XAXIDMA_DFT_RX_WAITBOUND << XAXIDMA_DELAY_SHIFT));
/* Enable coalesce, delay timer and error interrupts */
cr |= XAXIDMA_IRQ_ALL_MASK;
/* Write to the Rx channel control register */
nixge_dma_write_reg(priv, XAXIDMA_RX_CR_OFFSET, cr);
/* Start updating the Tx channel control register */
cr = nixge_dma_read_reg(priv, XAXIDMA_TX_CR_OFFSET);
/* Update the interrupt coalesce count */
cr = (((cr & ~XAXIDMA_COALESCE_MASK)) |
((priv->coalesce_count_tx) << XAXIDMA_COALESCE_SHIFT));
/* Update the delay timer count */
cr = (((cr & ~XAXIDMA_DELAY_MASK)) |
(XAXIDMA_DFT_TX_WAITBOUND << XAXIDMA_DELAY_SHIFT));
/* Enable coalesce, delay timer and error interrupts */
cr |= XAXIDMA_IRQ_ALL_MASK;
/* Write to the Tx channel control register */
nixge_dma_write_reg(priv, XAXIDMA_TX_CR_OFFSET, cr);
/* Populate the tail pointer and bring the Rx Axi DMA engine out of
* halted state. This will make the Rx side ready for reception.
*/
nixge_dma_write_desc_reg(priv, XAXIDMA_RX_CDESC_OFFSET, priv->rx_bd_p);
cr = nixge_dma_read_reg(priv, XAXIDMA_RX_CR_OFFSET);
nixge_dma_write_reg(priv, XAXIDMA_RX_CR_OFFSET,
cr | XAXIDMA_CR_RUNSTOP_MASK);
nixge_dma_write_desc_reg(priv, XAXIDMA_RX_TDESC_OFFSET, priv->rx_bd_p +
(sizeof(*priv->rx_bd_v) * (RX_BD_NUM - 1)));
/* Write to the RS (Run-stop) bit in the Tx channel control register.
* Tx channel is now ready to run. But only after we write to the
* tail pointer register that the Tx channel will start transmitting.
*/
nixge_dma_write_desc_reg(priv, XAXIDMA_TX_CDESC_OFFSET, priv->tx_bd_p);
cr = nixge_dma_read_reg(priv, XAXIDMA_TX_CR_OFFSET);
nixge_dma_write_reg(priv, XAXIDMA_TX_CR_OFFSET,
cr | XAXIDMA_CR_RUNSTOP_MASK);
return 0;
out:
nixge_hw_dma_bd_release(ndev);
return -ENOMEM;
}
static void __nixge_device_reset(struct nixge_priv *priv, off_t offset)
{
u32 status;
int err;
/* Reset Axi DMA. This would reset NIXGE Ethernet core as well.
* The reset process of Axi DMA takes a while to complete as all
* pending commands/transfers will be flushed or completed during
* this reset process.
*/
nixge_dma_write_reg(priv, offset, XAXIDMA_CR_RESET_MASK);
err = nixge_dma_poll_timeout(priv, offset, status,
!(status & XAXIDMA_CR_RESET_MASK), 10,
1000);
if (err)
netdev_err(priv->ndev, "%s: DMA reset timeout!\n", __func__);
}
static void nixge_device_reset(struct net_device *ndev)
{
struct nixge_priv *priv = netdev_priv(ndev);
__nixge_device_reset(priv, XAXIDMA_TX_CR_OFFSET);
__nixge_device_reset(priv, XAXIDMA_RX_CR_OFFSET);
if (nixge_hw_dma_bd_init(ndev))
netdev_err(ndev, "%s: descriptor allocation failed\n",
__func__);
netif_trans_update(ndev);
}
static void nixge_handle_link_change(struct net_device *ndev)
{
struct nixge_priv *priv = netdev_priv(ndev);
struct phy_device *phydev = ndev->phydev;
if (phydev->link != priv->link || phydev->speed != priv->speed ||
phydev->duplex != priv->duplex) {
priv->link = phydev->link;
priv->speed = phydev->speed;
priv->duplex = phydev->duplex;
phy_print_status(phydev);
}
}
static void nixge_tx_skb_unmap(struct nixge_priv *priv,
struct nixge_tx_skb *tx_skb)
{
if (tx_skb->mapping) {
if (tx_skb->mapped_as_page)
dma_unmap_page(priv->ndev->dev.parent, tx_skb->mapping,
tx_skb->size, DMA_TO_DEVICE);
else
dma_unmap_single(priv->ndev->dev.parent,
tx_skb->mapping,
tx_skb->size, DMA_TO_DEVICE);
tx_skb->mapping = 0;
}
if (tx_skb->skb) {
dev_kfree_skb_any(tx_skb->skb);
tx_skb->skb = NULL;
}
}
static void nixge_start_xmit_done(struct net_device *ndev)
{
struct nixge_priv *priv = netdev_priv(ndev);
struct nixge_hw_dma_bd *cur_p;
struct nixge_tx_skb *tx_skb;
unsigned int status = 0;
u32 packets = 0;
u32 size = 0;
cur_p = &priv->tx_bd_v[priv->tx_bd_ci];
tx_skb = &priv->tx_skb[priv->tx_bd_ci];
status = cur_p->status;
while (status & XAXIDMA_BD_STS_COMPLETE_MASK) {
nixge_tx_skb_unmap(priv, tx_skb);
cur_p->status = 0;
size += status & XAXIDMA_BD_STS_ACTUAL_LEN_MASK;
packets++;
++priv->tx_bd_ci;
priv->tx_bd_ci %= TX_BD_NUM;
cur_p = &priv->tx_bd_v[priv->tx_bd_ci];
tx_skb = &priv->tx_skb[priv->tx_bd_ci];
status = cur_p->status;
}
ndev->stats.tx_packets += packets;
ndev->stats.tx_bytes += size;
if (packets)
netif_wake_queue(ndev);
}
static int nixge_check_tx_bd_space(struct nixge_priv *priv,
int num_frag)
{
struct nixge_hw_dma_bd *cur_p;
cur_p = &priv->tx_bd_v[(priv->tx_bd_tail + num_frag) % TX_BD_NUM];
if (cur_p->status & XAXIDMA_BD_STS_ALL_MASK)
return NETDEV_TX_BUSY;
return 0;
}
static int nixge_start_xmit(struct sk_buff *skb, struct net_device *ndev)
{
struct nixge_priv *priv = netdev_priv(ndev);
struct nixge_hw_dma_bd *cur_p;
struct nixge_tx_skb *tx_skb;
dma_addr_t tail_p, cur_phys;
skb_frag_t *frag;
u32 num_frag;
u32 ii;
num_frag = skb_shinfo(skb)->nr_frags;
cur_p = &priv->tx_bd_v[priv->tx_bd_tail];
tx_skb = &priv->tx_skb[priv->tx_bd_tail];
if (nixge_check_tx_bd_space(priv, num_frag)) {
if (!netif_queue_stopped(ndev))
netif_stop_queue(ndev);
return NETDEV_TX_OK;
}
cur_phys = dma_map_single(ndev->dev.parent, skb->data,
skb_headlen(skb), DMA_TO_DEVICE);
if (dma_mapping_error(ndev->dev.parent, cur_phys))
goto drop;
nixge_hw_dma_bd_set_phys(cur_p, cur_phys);
cur_p->cntrl = skb_headlen(skb) | XAXIDMA_BD_CTRL_TXSOF_MASK;
tx_skb->skb = NULL;
tx_skb->mapping = cur_phys;
tx_skb->size = skb_headlen(skb);
tx_skb->mapped_as_page = false;
for (ii = 0; ii < num_frag; ii++) {
++priv->tx_bd_tail;
priv->tx_bd_tail %= TX_BD_NUM;
cur_p = &priv->tx_bd_v[priv->tx_bd_tail];
tx_skb = &priv->tx_skb[priv->tx_bd_tail];
frag = &skb_shinfo(skb)->frags[ii];
cur_phys = skb_frag_dma_map(ndev->dev.parent, frag, 0,
skb_frag_size(frag),
DMA_TO_DEVICE);
if (dma_mapping_error(ndev->dev.parent, cur_phys))
goto frag_err;
nixge_hw_dma_bd_set_phys(cur_p, cur_phys);
cur_p->cntrl = skb_frag_size(frag);
tx_skb->skb = NULL;
tx_skb->mapping = cur_phys;
tx_skb->size = skb_frag_size(frag);
tx_skb->mapped_as_page = true;
}
/* last buffer of the frame */
tx_skb->skb = skb;
cur_p->cntrl |= XAXIDMA_BD_CTRL_TXEOF_MASK;
tail_p = priv->tx_bd_p + sizeof(*priv->tx_bd_v) * priv->tx_bd_tail;
/* Start the transfer */
nixge_dma_write_desc_reg(priv, XAXIDMA_TX_TDESC_OFFSET, tail_p);
++priv->tx_bd_tail;
priv->tx_bd_tail %= TX_BD_NUM;
return NETDEV_TX_OK;
frag_err:
for (; ii > 0; ii--) {
if (priv->tx_bd_tail)
priv->tx_bd_tail--;
else
priv->tx_bd_tail = TX_BD_NUM - 1;
tx_skb = &priv->tx_skb[priv->tx_bd_tail];
nixge_tx_skb_unmap(priv, tx_skb);
cur_p = &priv->tx_bd_v[priv->tx_bd_tail];
cur_p->status = 0;
}
dma_unmap_single(priv->ndev->dev.parent,
tx_skb->mapping,
tx_skb->size, DMA_TO_DEVICE);
drop:
ndev->stats.tx_dropped++;
return NETDEV_TX_OK;
}
static int nixge_recv(struct net_device *ndev, int budget)
{
struct nixge_priv *priv = netdev_priv(ndev);
struct sk_buff *skb, *new_skb;
struct nixge_hw_dma_bd *cur_p;
dma_addr_t tail_p = 0, cur_phys = 0;
u32 packets = 0;
u32 length = 0;
u32 size = 0;
cur_p = &priv->rx_bd_v[priv->rx_bd_ci];
while ((cur_p->status & XAXIDMA_BD_STS_COMPLETE_MASK &&
budget > packets)) {
tail_p = priv->rx_bd_p + sizeof(*priv->rx_bd_v) *
priv->rx_bd_ci;
skb = (struct sk_buff *)(uintptr_t)
nixge_hw_dma_bd_get_addr(cur_p, sw_id_offset);
length = cur_p->status & XAXIDMA_BD_STS_ACTUAL_LEN_MASK;
if (length > NIXGE_MAX_JUMBO_FRAME_SIZE)
length = NIXGE_MAX_JUMBO_FRAME_SIZE;
dma_unmap_single(ndev->dev.parent,
nixge_hw_dma_bd_get_addr(cur_p, phys),
NIXGE_MAX_JUMBO_FRAME_SIZE,
DMA_FROM_DEVICE);
skb_put(skb, length);
skb->protocol = eth_type_trans(skb, ndev);
skb_checksum_none_assert(skb);
/* For now mark them as CHECKSUM_NONE since
* we don't have offload capabilities
*/
skb->ip_summed = CHECKSUM_NONE;
napi_gro_receive(&priv->napi, skb);
size += length;
packets++;
new_skb = netdev_alloc_skb_ip_align(ndev,
NIXGE_MAX_JUMBO_FRAME_SIZE);
if (!new_skb)
return packets;
cur_phys = dma_map_single(ndev->dev.parent, new_skb->data,
NIXGE_MAX_JUMBO_FRAME_SIZE,
DMA_FROM_DEVICE);
if (dma_mapping_error(ndev->dev.parent, cur_phys)) {
/* FIXME: bail out and clean up */
netdev_err(ndev, "Failed to map ...\n");
}
nixge_hw_dma_bd_set_phys(cur_p, cur_phys);
cur_p->cntrl = NIXGE_MAX_JUMBO_FRAME_SIZE;
cur_p->status = 0;
nixge_hw_dma_bd_set_offset(cur_p, (uintptr_t)new_skb);
++priv->rx_bd_ci;
priv->rx_bd_ci %= RX_BD_NUM;
cur_p = &priv->rx_bd_v[priv->rx_bd_ci];
}
ndev->stats.rx_packets += packets;
ndev->stats.rx_bytes += size;
if (tail_p)
nixge_dma_write_desc_reg(priv, XAXIDMA_RX_TDESC_OFFSET, tail_p);
return packets;
}
static int nixge_poll(struct napi_struct *napi, int budget)
{
struct nixge_priv *priv = container_of(napi, struct nixge_priv, napi);
int work_done;
u32 status, cr;
work_done = 0;
work_done = nixge_recv(priv->ndev, budget);
if (work_done < budget) {
napi_complete_done(napi, work_done);
status = nixge_dma_read_reg(priv, XAXIDMA_RX_SR_OFFSET);
if (status & (XAXIDMA_IRQ_IOC_MASK | XAXIDMA_IRQ_DELAY_MASK)) {
/* If there's more, reschedule, but clear */
nixge_dma_write_reg(priv, XAXIDMA_RX_SR_OFFSET, status);
napi_reschedule(napi);
} else {
/* if not, turn on RX IRQs again ... */
cr = nixge_dma_read_reg(priv, XAXIDMA_RX_CR_OFFSET);
cr |= (XAXIDMA_IRQ_IOC_MASK | XAXIDMA_IRQ_DELAY_MASK);
nixge_dma_write_reg(priv, XAXIDMA_RX_CR_OFFSET, cr);
}
}
return work_done;
}
static irqreturn_t nixge_tx_irq(int irq, void *_ndev)
{
struct nixge_priv *priv = netdev_priv(_ndev);
struct net_device *ndev = _ndev;
unsigned int status;
dma_addr_t phys;
u32 cr;
status = nixge_dma_read_reg(priv, XAXIDMA_TX_SR_OFFSET);
if (status & (XAXIDMA_IRQ_IOC_MASK | XAXIDMA_IRQ_DELAY_MASK)) {
nixge_dma_write_reg(priv, XAXIDMA_TX_SR_OFFSET, status);
nixge_start_xmit_done(priv->ndev);
goto out;
}
if (!(status & XAXIDMA_IRQ_ALL_MASK)) {
netdev_err(ndev, "No interrupts asserted in Tx path\n");
return IRQ_NONE;
}
if (status & XAXIDMA_IRQ_ERROR_MASK) {
phys = nixge_hw_dma_bd_get_addr(&priv->tx_bd_v[priv->tx_bd_ci],
phys);
netdev_err(ndev, "DMA Tx error 0x%x\n", status);
netdev_err(ndev, "Current BD is at: 0x%llx\n", (u64)phys);
cr = nixge_dma_read_reg(priv, XAXIDMA_TX_CR_OFFSET);
/* Disable coalesce, delay timer and error interrupts */
cr &= (~XAXIDMA_IRQ_ALL_MASK);
/* Write to the Tx channel control register */
nixge_dma_write_reg(priv, XAXIDMA_TX_CR_OFFSET, cr);
cr = nixge_dma_read_reg(priv, XAXIDMA_RX_CR_OFFSET);
/* Disable coalesce, delay timer and error interrupts */
cr &= (~XAXIDMA_IRQ_ALL_MASK);
/* Write to the Rx channel control register */
nixge_dma_write_reg(priv, XAXIDMA_RX_CR_OFFSET, cr);
tasklet_schedule(&priv->dma_err_tasklet);
nixge_dma_write_reg(priv, XAXIDMA_TX_SR_OFFSET, status);
}
out:
return IRQ_HANDLED;
}
static irqreturn_t nixge_rx_irq(int irq, void *_ndev)
{
struct nixge_priv *priv = netdev_priv(_ndev);
struct net_device *ndev = _ndev;
unsigned int status;
dma_addr_t phys;
u32 cr;
status = nixge_dma_read_reg(priv, XAXIDMA_RX_SR_OFFSET);
if (status & (XAXIDMA_IRQ_IOC_MASK | XAXIDMA_IRQ_DELAY_MASK)) {
/* Turn of IRQs because NAPI */
nixge_dma_write_reg(priv, XAXIDMA_RX_SR_OFFSET, status);
cr = nixge_dma_read_reg(priv, XAXIDMA_RX_CR_OFFSET);
cr &= ~(XAXIDMA_IRQ_IOC_MASK | XAXIDMA_IRQ_DELAY_MASK);
nixge_dma_write_reg(priv, XAXIDMA_RX_CR_OFFSET, cr);
if (napi_schedule_prep(&priv->napi))
__napi_schedule(&priv->napi);
goto out;
}
if (!(status & XAXIDMA_IRQ_ALL_MASK)) {
netdev_err(ndev, "No interrupts asserted in Rx path\n");
return IRQ_NONE;
}
if (status & XAXIDMA_IRQ_ERROR_MASK) {
phys = nixge_hw_dma_bd_get_addr(&priv->rx_bd_v[priv->rx_bd_ci],
phys);
netdev_err(ndev, "DMA Rx error 0x%x\n", status);
netdev_err(ndev, "Current BD is at: 0x%llx\n", (u64)phys);
cr = nixge_dma_read_reg(priv, XAXIDMA_TX_CR_OFFSET);
/* Disable coalesce, delay timer and error interrupts */
cr &= (~XAXIDMA_IRQ_ALL_MASK);
/* Finally write to the Tx channel control register */
nixge_dma_write_reg(priv, XAXIDMA_TX_CR_OFFSET, cr);
cr = nixge_dma_read_reg(priv, XAXIDMA_RX_CR_OFFSET);
/* Disable coalesce, delay timer and error interrupts */
cr &= (~XAXIDMA_IRQ_ALL_MASK);
/* write to the Rx channel control register */
nixge_dma_write_reg(priv, XAXIDMA_RX_CR_OFFSET, cr);
tasklet_schedule(&priv->dma_err_tasklet);
nixge_dma_write_reg(priv, XAXIDMA_RX_SR_OFFSET, status);
}
out:
return IRQ_HANDLED;
}
static void nixge_dma_err_handler(unsigned long data)
{
struct nixge_priv *lp = (struct nixge_priv *)data;
struct nixge_hw_dma_bd *cur_p;
struct nixge_tx_skb *tx_skb;
u32 cr, i;
__nixge_device_reset(lp, XAXIDMA_TX_CR_OFFSET);
__nixge_device_reset(lp, XAXIDMA_RX_CR_OFFSET);
for (i = 0; i < TX_BD_NUM; i++) {
cur_p = &lp->tx_bd_v[i];
tx_skb = &lp->tx_skb[i];
nixge_tx_skb_unmap(lp, tx_skb);
nixge_hw_dma_bd_set_phys(cur_p, 0);
cur_p->cntrl = 0;
cur_p->status = 0;
nixge_hw_dma_bd_set_offset(cur_p, 0);
}
for (i = 0; i < RX_BD_NUM; i++) {
cur_p = &lp->rx_bd_v[i];
cur_p->status = 0;
}
lp->tx_bd_ci = 0;
lp->tx_bd_tail = 0;
lp->rx_bd_ci = 0;
/* Start updating the Rx channel control register */
cr = nixge_dma_read_reg(lp, XAXIDMA_RX_CR_OFFSET);
/* Update the interrupt coalesce count */
cr = ((cr & ~XAXIDMA_COALESCE_MASK) |
(XAXIDMA_DFT_RX_THRESHOLD << XAXIDMA_COALESCE_SHIFT));
/* Update the delay timer count */
cr = ((cr & ~XAXIDMA_DELAY_MASK) |
(XAXIDMA_DFT_RX_WAITBOUND << XAXIDMA_DELAY_SHIFT));
/* Enable coalesce, delay timer and error interrupts */
cr |= XAXIDMA_IRQ_ALL_MASK;
/* Finally write to the Rx channel control register */
nixge_dma_write_reg(lp, XAXIDMA_RX_CR_OFFSET, cr);
/* Start updating the Tx channel control register */
cr = nixge_dma_read_reg(lp, XAXIDMA_TX_CR_OFFSET);
/* Update the interrupt coalesce count */
cr = (((cr & ~XAXIDMA_COALESCE_MASK)) |
(XAXIDMA_DFT_TX_THRESHOLD << XAXIDMA_COALESCE_SHIFT));
/* Update the delay timer count */
cr = (((cr & ~XAXIDMA_DELAY_MASK)) |
(XAXIDMA_DFT_TX_WAITBOUND << XAXIDMA_DELAY_SHIFT));
/* Enable coalesce, delay timer and error interrupts */
cr |= XAXIDMA_IRQ_ALL_MASK;
/* Finally write to the Tx channel control register */
nixge_dma_write_reg(lp, XAXIDMA_TX_CR_OFFSET, cr);
/* Populate the tail pointer and bring the Rx Axi DMA engine out of
* halted state. This will make the Rx side ready for reception.
*/
nixge_dma_write_desc_reg(lp, XAXIDMA_RX_CDESC_OFFSET, lp->rx_bd_p);
cr = nixge_dma_read_reg(lp, XAXIDMA_RX_CR_OFFSET);
nixge_dma_write_reg(lp, XAXIDMA_RX_CR_OFFSET,
cr | XAXIDMA_CR_RUNSTOP_MASK);
nixge_dma_write_desc_reg(lp, XAXIDMA_RX_TDESC_OFFSET, lp->rx_bd_p +
(sizeof(*lp->rx_bd_v) * (RX_BD_NUM - 1)));
/* Write to the RS (Run-stop) bit in the Tx channel control register.
* Tx channel is now ready to run. But only after we write to the
* tail pointer register that the Tx channel will start transmitting
*/
nixge_dma_write_desc_reg(lp, XAXIDMA_TX_CDESC_OFFSET, lp->tx_bd_p);
cr = nixge_dma_read_reg(lp, XAXIDMA_TX_CR_OFFSET);
nixge_dma_write_reg(lp, XAXIDMA_TX_CR_OFFSET,
cr | XAXIDMA_CR_RUNSTOP_MASK);
}
static int nixge_open(struct net_device *ndev)
{
struct nixge_priv *priv = netdev_priv(ndev);
struct phy_device *phy;
int ret;
nixge_device_reset(ndev);
phy = of_phy_connect(ndev, priv->phy_node,
&nixge_handle_link_change, 0, priv->phy_mode);
if (!phy)
return -ENODEV;
phy_start(phy);
/* Enable tasklets for Axi DMA error handling */
tasklet_init(&priv->dma_err_tasklet, nixge_dma_err_handler,
(unsigned long)priv);
napi_enable(&priv->napi);
/* Enable interrupts for Axi DMA Tx */
ret = request_irq(priv->tx_irq, nixge_tx_irq, 0, ndev->name, ndev);
if (ret)
goto err_tx_irq;
/* Enable interrupts for Axi DMA Rx */
ret = request_irq(priv->rx_irq, nixge_rx_irq, 0, ndev->name, ndev);
if (ret)
goto err_rx_irq;
netif_start_queue(ndev);
return 0;
err_rx_irq:
free_irq(priv->tx_irq, ndev);
err_tx_irq:
phy_stop(phy);
phy_disconnect(phy);
tasklet_kill(&priv->dma_err_tasklet);
netdev_err(ndev, "request_irq() failed\n");
return ret;
}
static int nixge_stop(struct net_device *ndev)
{
struct nixge_priv *priv = netdev_priv(ndev);
u32 cr;
netif_stop_queue(ndev);
napi_disable(&priv->napi);
if (ndev->phydev) {
phy_stop(ndev->phydev);
phy_disconnect(ndev->phydev);
}
cr = nixge_dma_read_reg(priv, XAXIDMA_RX_CR_OFFSET);
nixge_dma_write_reg(priv, XAXIDMA_RX_CR_OFFSET,
cr & (~XAXIDMA_CR_RUNSTOP_MASK));
cr = nixge_dma_read_reg(priv, XAXIDMA_TX_CR_OFFSET);
nixge_dma_write_reg(priv, XAXIDMA_TX_CR_OFFSET,
cr & (~XAXIDMA_CR_RUNSTOP_MASK));
tasklet_kill(&priv->dma_err_tasklet);
free_irq(priv->tx_irq, ndev);
free_irq(priv->rx_irq, ndev);
nixge_hw_dma_bd_release(ndev);
return 0;
}
static int nixge_change_mtu(struct net_device *ndev, int new_mtu)
{
if (netif_running(ndev))
return -EBUSY;
if ((new_mtu + NIXGE_HDR_SIZE + NIXGE_TRL_SIZE) >
NIXGE_MAX_JUMBO_FRAME_SIZE)
return -EINVAL;
ndev->mtu = new_mtu;
return 0;
}
static s32 __nixge_hw_set_mac_address(struct net_device *ndev)
{
struct nixge_priv *priv = netdev_priv(ndev);
nixge_ctrl_write_reg(priv, NIXGE_REG_MAC_LSB,
(ndev->dev_addr[2]) << 24 |
(ndev->dev_addr[3] << 16) |
(ndev->dev_addr[4] << 8) |
(ndev->dev_addr[5] << 0));
nixge_ctrl_write_reg(priv, NIXGE_REG_MAC_MSB,
(ndev->dev_addr[1] | (ndev->dev_addr[0] << 8)));
return 0;
}
static int nixge_net_set_mac_address(struct net_device *ndev, void *p)
{
int err;
err = eth_mac_addr(ndev, p);
if (!err)
__nixge_hw_set_mac_address(ndev);
return err;
}
static const struct net_device_ops nixge_netdev_ops = {
.ndo_open = nixge_open,
.ndo_stop = nixge_stop,
.ndo_start_xmit = nixge_start_xmit,
.ndo_change_mtu = nixge_change_mtu,
.ndo_set_mac_address = nixge_net_set_mac_address,
.ndo_validate_addr = eth_validate_addr,
};
static void nixge_ethtools_get_drvinfo(struct net_device *ndev,
struct ethtool_drvinfo *ed)
{
strlcpy(ed->driver, "nixge", sizeof(ed->driver));
strlcpy(ed->bus_info, "platform", sizeof(ed->driver));
}
static int nixge_ethtools_get_coalesce(struct net_device *ndev,
struct ethtool_coalesce *ecoalesce)
{
struct nixge_priv *priv = netdev_priv(ndev);
u32 regval = 0;
regval = nixge_dma_read_reg(priv, XAXIDMA_RX_CR_OFFSET);
ecoalesce->rx_max_coalesced_frames = (regval & XAXIDMA_COALESCE_MASK)
>> XAXIDMA_COALESCE_SHIFT;
regval = nixge_dma_read_reg(priv, XAXIDMA_TX_CR_OFFSET);
ecoalesce->tx_max_coalesced_frames = (regval & XAXIDMA_COALESCE_MASK)
>> XAXIDMA_COALESCE_SHIFT;
return 0;
}
static int nixge_ethtools_set_coalesce(struct net_device *ndev,
struct ethtool_coalesce *ecoalesce)
{
struct nixge_priv *priv = netdev_priv(ndev);
if (netif_running(ndev)) {
netdev_err(ndev,
"Please stop netif before applying configuration\n");
return -EBUSY;
}
if (ecoalesce->rx_coalesce_usecs ||
ecoalesce->rx_coalesce_usecs_irq ||
ecoalesce->rx_max_coalesced_frames_irq ||
ecoalesce->tx_coalesce_usecs ||
ecoalesce->tx_coalesce_usecs_irq ||
ecoalesce->tx_max_coalesced_frames_irq ||
ecoalesce->stats_block_coalesce_usecs ||
ecoalesce->use_adaptive_rx_coalesce ||
ecoalesce->use_adaptive_tx_coalesce ||
ecoalesce->pkt_rate_low ||
ecoalesce->rx_coalesce_usecs_low ||
ecoalesce->rx_max_coalesced_frames_low ||
ecoalesce->tx_coalesce_usecs_low ||
ecoalesce->tx_max_coalesced_frames_low ||
ecoalesce->pkt_rate_high ||
ecoalesce->rx_coalesce_usecs_high ||
ecoalesce->rx_max_coalesced_frames_high ||
ecoalesce->tx_coalesce_usecs_high ||
ecoalesce->tx_max_coalesced_frames_high ||
ecoalesce->rate_sample_interval)
return -EOPNOTSUPP;
if (ecoalesce->rx_max_coalesced_frames)
priv->coalesce_count_rx = ecoalesce->rx_max_coalesced_frames;
if (ecoalesce->tx_max_coalesced_frames)
priv->coalesce_count_tx = ecoalesce->tx_max_coalesced_frames;
return 0;
}
static int nixge_ethtools_set_phys_id(struct net_device *ndev,
enum ethtool_phys_id_state state)
{
struct nixge_priv *priv = netdev_priv(ndev);
u32 ctrl;
ctrl = nixge_ctrl_read_reg(priv, NIXGE_REG_LED_CTL);
switch (state) {
case ETHTOOL_ID_ACTIVE:
ctrl |= NIXGE_ID_LED_CTL_EN;
/* Enable identification LED override*/
nixge_ctrl_write_reg(priv, NIXGE_REG_LED_CTL, ctrl);
return 2;
case ETHTOOL_ID_ON:
ctrl |= NIXGE_ID_LED_CTL_VAL;
nixge_ctrl_write_reg(priv, NIXGE_REG_LED_CTL, ctrl);
break;
case ETHTOOL_ID_OFF:
ctrl &= ~NIXGE_ID_LED_CTL_VAL;
nixge_ctrl_write_reg(priv, NIXGE_REG_LED_CTL, ctrl);
break;
case ETHTOOL_ID_INACTIVE:
/* Restore LED settings */
ctrl &= ~NIXGE_ID_LED_CTL_EN;
nixge_ctrl_write_reg(priv, NIXGE_REG_LED_CTL, ctrl);
break;
}
return 0;
}
static const struct ethtool_ops nixge_ethtool_ops = {
.get_drvinfo = nixge_ethtools_get_drvinfo,
.get_coalesce = nixge_ethtools_get_coalesce,
.set_coalesce = nixge_ethtools_set_coalesce,
.set_phys_id = nixge_ethtools_set_phys_id,
.get_link_ksettings = phy_ethtool_get_link_ksettings,
.set_link_ksettings = phy_ethtool_set_link_ksettings,
.get_link = ethtool_op_get_link,
};
static int nixge_mdio_read(struct mii_bus *bus, int phy_id, int reg)
{
struct nixge_priv *priv = bus->priv;
u32 status, tmp;
int err;
u16 device;
if (reg & MII_ADDR_C45) {
device = (reg >> 16) & 0x1f;
nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_ADDR, reg & 0xffff);
tmp = NIXGE_MDIO_CLAUSE45 | NIXGE_MDIO_OP(NIXGE_MDIO_OP_ADDRESS)
| NIXGE_MDIO_ADDR(phy_id) | NIXGE_MDIO_MMD(device);
nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_OP, tmp);
nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_CTRL, 1);
err = nixge_ctrl_poll_timeout(priv, NIXGE_REG_MDIO_CTRL, status,
!status, 10, 1000);
if (err) {
dev_err(priv->dev, "timeout setting address");
return err;
}
tmp = NIXGE_MDIO_CLAUSE45 | NIXGE_MDIO_OP(NIXGE_MDIO_C45_READ) |
NIXGE_MDIO_ADDR(phy_id) | NIXGE_MDIO_MMD(device);
} else {
device = reg & 0x1f;
tmp = NIXGE_MDIO_CLAUSE22 | NIXGE_MDIO_OP(NIXGE_MDIO_C22_READ) |
NIXGE_MDIO_ADDR(phy_id) | NIXGE_MDIO_MMD(device);
}
nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_OP, tmp);
nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_CTRL, 1);
err = nixge_ctrl_poll_timeout(priv, NIXGE_REG_MDIO_CTRL, status,
!status, 10, 1000);
if (err) {
dev_err(priv->dev, "timeout setting read command");
return err;
}
status = nixge_ctrl_read_reg(priv, NIXGE_REG_MDIO_DATA);
return status;
}
static int nixge_mdio_write(struct mii_bus *bus, int phy_id, int reg, u16 val)
{
struct nixge_priv *priv = bus->priv;
u32 status, tmp;
u16 device;
int err;
if (reg & MII_ADDR_C45) {
device = (reg >> 16) & 0x1f;
nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_ADDR, reg & 0xffff);
tmp = NIXGE_MDIO_CLAUSE45 | NIXGE_MDIO_OP(NIXGE_MDIO_OP_ADDRESS)
| NIXGE_MDIO_ADDR(phy_id) | NIXGE_MDIO_MMD(device);
nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_OP, tmp);
nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_CTRL, 1);
err = nixge_ctrl_poll_timeout(priv, NIXGE_REG_MDIO_CTRL, status,
!status, 10, 1000);
if (err) {
dev_err(priv->dev, "timeout setting address");
return err;
}
tmp = NIXGE_MDIO_CLAUSE45 | NIXGE_MDIO_OP(NIXGE_MDIO_C45_WRITE)
| NIXGE_MDIO_ADDR(phy_id) | NIXGE_MDIO_MMD(device);
nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_DATA, val);
nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_OP, tmp);
err = nixge_ctrl_poll_timeout(priv, NIXGE_REG_MDIO_CTRL, status,
!status, 10, 1000);
if (err)
dev_err(priv->dev, "timeout setting write command");
} else {
device = reg & 0x1f;
tmp = NIXGE_MDIO_CLAUSE22 |
NIXGE_MDIO_OP(NIXGE_MDIO_C22_WRITE) |
NIXGE_MDIO_ADDR(phy_id) | NIXGE_MDIO_MMD(device);
nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_DATA, val);
nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_OP, tmp);
nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_CTRL, 1);
err = nixge_ctrl_poll_timeout(priv, NIXGE_REG_MDIO_CTRL, status,
!status, 10, 1000);
if (err)
dev_err(priv->dev, "timeout setting write command");
}
return err;
}
static int nixge_mdio_setup(struct nixge_priv *priv, struct device_node *np)
{
struct mii_bus *bus;
bus = devm_mdiobus_alloc(priv->dev);
if (!bus)
return -ENOMEM;
snprintf(bus->id, MII_BUS_ID_SIZE, "%s-mii", dev_name(priv->dev));
bus->priv = priv;
bus->name = "nixge_mii_bus";
bus->read = nixge_mdio_read;
bus->write = nixge_mdio_write;
bus->parent = priv->dev;
priv->mii_bus = bus;
return of_mdiobus_register(bus, np);
}
static void *nixge_get_nvmem_address(struct device *dev)
{
struct nvmem_cell *cell;
size_t cell_size;
char *mac;
cell = nvmem_cell_get(dev, "address");
if (IS_ERR(cell))
return NULL;
mac = nvmem_cell_read(cell, &cell_size);
nvmem_cell_put(cell);
return mac;
}
/* Match table for of_platform binding */
static const struct of_device_id nixge_dt_ids[] = {
{ .compatible = "ni,xge-enet-2.00", .data = (void *)NIXGE_V2 },
{ .compatible = "ni,xge-enet-3.00", .data = (void *)NIXGE_V3 },
{},
};
MODULE_DEVICE_TABLE(of, nixge_dt_ids);
static int nixge_of_get_resources(struct platform_device *pdev)
{
const struct of_device_id *of_id;
enum nixge_version version;
struct resource *ctrlres;
struct resource *dmares;
struct net_device *ndev;
struct nixge_priv *priv;
ndev = platform_get_drvdata(pdev);
priv = netdev_priv(ndev);
of_id = of_match_node(nixge_dt_ids, pdev->dev.of_node);
if (!of_id)
return -ENODEV;
version = (enum nixge_version)of_id->data;
if (version <= NIXGE_V2)
dmares = platform_get_resource(pdev, IORESOURCE_MEM, 0);
else
dmares = platform_get_resource_byname(pdev, IORESOURCE_MEM,
"dma");
priv->dma_regs = devm_ioremap_resource(&pdev->dev, dmares);
if (IS_ERR(priv->dma_regs)) {
netdev_err(ndev, "failed to map dma regs\n");
return PTR_ERR(priv->dma_regs);
}
if (version <= NIXGE_V2) {
priv->ctrl_regs = priv->dma_regs + NIXGE_REG_CTRL_OFFSET;
} else {
ctrlres = platform_get_resource_byname(pdev, IORESOURCE_MEM,
"ctrl");
priv->ctrl_regs = devm_ioremap_resource(&pdev->dev, ctrlres);
}
if (IS_ERR(priv->ctrl_regs)) {
netdev_err(ndev, "failed to map ctrl regs\n");
return PTR_ERR(priv->ctrl_regs);
}
return 0;
}
static int nixge_probe(struct platform_device *pdev)
{
struct device_node *mn, *phy_node;
struct nixge_priv *priv;
struct net_device *ndev;
const u8 *mac_addr;
int err;
ndev = alloc_etherdev(sizeof(*priv));
if (!ndev)
return -ENOMEM;
platform_set_drvdata(pdev, ndev);
SET_NETDEV_DEV(ndev, &pdev->dev);
ndev->features = NETIF_F_SG;
ndev->netdev_ops = &nixge_netdev_ops;
ndev->ethtool_ops = &nixge_ethtool_ops;
/* MTU range: 64 - 9000 */
ndev->min_mtu = 64;
ndev->max_mtu = NIXGE_JUMBO_MTU;
mac_addr = nixge_get_nvmem_address(&pdev->dev);
if (mac_addr && is_valid_ether_addr(mac_addr)) {
ether_addr_copy(ndev->dev_addr, mac_addr);
kfree(mac_addr);
} else {
eth_hw_addr_random(ndev);
}
priv = netdev_priv(ndev);
priv->ndev = ndev;
priv->dev = &pdev->dev;
netif_napi_add(ndev, &priv->napi, nixge_poll, NAPI_POLL_WEIGHT);
err = nixge_of_get_resources(pdev);
if (err)
return err;
__nixge_hw_set_mac_address(ndev);
priv->tx_irq = platform_get_irq_byname(pdev, "tx");
if (priv->tx_irq < 0) {
netdev_err(ndev, "could not find 'tx' irq");
return priv->tx_irq;
}
priv->rx_irq = platform_get_irq_byname(pdev, "rx");
if (priv->rx_irq < 0) {
netdev_err(ndev, "could not find 'rx' irq");
return priv->rx_irq;
}
priv->coalesce_count_rx = XAXIDMA_DFT_RX_THRESHOLD;
priv->coalesce_count_tx = XAXIDMA_DFT_TX_THRESHOLD;
mn = of_get_child_by_name(pdev->dev.of_node, "mdio");
if (mn) {
err = nixge_mdio_setup(priv, mn);
of_node_put(mn);
if (err) {
netdev_err(ndev, "error registering mdio bus");
goto free_netdev;
}
}
priv->phy_mode = of_get_phy_mode(pdev->dev.of_node);
if (priv->phy_mode < 0) {
netdev_err(ndev, "not find \"phy-mode\" property\n");
err = -EINVAL;
goto unregister_mdio;
}
phy_node = of_parse_phandle(pdev->dev.of_node, "phy-handle", 0);
if (!phy_node && of_phy_is_fixed_link(pdev->dev.of_node)) {
err = of_phy_register_fixed_link(pdev->dev.of_node);
if (err < 0) {
netdev_err(ndev, "broken fixed-link specification\n");
goto unregister_mdio;
}
phy_node = of_node_get(pdev->dev.of_node);
}
priv->phy_node = phy_node;
err = register_netdev(priv->ndev);
if (err) {
netdev_err(ndev, "register_netdev() error (%i)\n", err);
goto free_phy;
}
return 0;
free_phy:
if (of_phy_is_fixed_link(pdev->dev.of_node))
of_phy_deregister_fixed_link(pdev->dev.of_node);
of_node_put(phy_node);
unregister_mdio:
if (priv->mii_bus)
mdiobus_unregister(priv->mii_bus);
free_netdev:
free_netdev(ndev);
return err;
}
static int nixge_remove(struct platform_device *pdev)
{
struct net_device *ndev = platform_get_drvdata(pdev);
struct nixge_priv *priv = netdev_priv(ndev);
unregister_netdev(ndev);
if (of_phy_is_fixed_link(pdev->dev.of_node))
of_phy_deregister_fixed_link(pdev->dev.of_node);
of_node_put(priv->phy_node);
if (priv->mii_bus)
mdiobus_unregister(priv->mii_bus);
free_netdev(ndev);
return 0;
}
static struct platform_driver nixge_driver = {
.probe = nixge_probe,
.remove = nixge_remove,
.driver = {
.name = "nixge",
.of_match_table = of_match_ptr(nixge_dt_ids),
},
};
module_platform_driver(nixge_driver);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("National Instruments XGE Management MAC");
MODULE_AUTHOR("Moritz Fischer <mdf@kernel.org>");
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