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net: nixge: Add support for 64-bit platforms

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Add support for 64-bit platforms to driver.

The hardware only supports 32-bit register accesses
so the accesses need to be split up into two writes
when setting the current and tail descriptor values.

Signed-off-by: Moritz Fischer <mdf@kernel.org>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Moritz Fischer 2018-08-28 15:16:31 -07:00 committed by David S. Miller
parent 02c7f38b7a
commit 7e8d5755be
2 changed files with 116 additions and 55 deletions
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3
drivers/net/ethernet/ni/Kconfig
View File

@ -18,8 +18,9 @@ if NET_VENDOR_NI
config NI_XGE_MANAGEMENT_ENET config NI_XGE_MANAGEMENT_ENET
tristate "National Instruments XGE management enet support" tristate "National Instruments XGE management enet support"
depends on ARCH_ZYNQ depends on HAS_IOMEM && HAS_DMA
select PHYLIB select PHYLIB
select OF_MDIO
help help
Simple LAN device for debug or management purposes. Can Simple LAN device for debug or management purposes. Can
support either 10G or 1G PHYs via SFP+ ports. support either 10G or 1G PHYs via SFP+ ports.

168
drivers/net/ethernet/ni/nixge.c
View File

@ -106,10 +106,10 @@
(NIXGE_JUMBO_MTU + NIXGE_HDR_SIZE + NIXGE_TRL_SIZE) (NIXGE_JUMBO_MTU + NIXGE_HDR_SIZE + NIXGE_TRL_SIZE)
struct nixge_hw_dma_bd { struct nixge_hw_dma_bd {
u32 next; u32 next_lo;
u32 reserved1; u32 next_hi;
u32 phys; u32 phys_lo;
u32 reserved2; u32 phys_hi;
u32 reserved3; u32 reserved3;
u32 reserved4; u32 reserved4;
u32 cntrl; u32 cntrl;
@ -119,11 +119,39 @@ struct nixge_hw_dma_bd {
u32 app2; u32 app2;
u32 app3; u32 app3;
u32 app4; u32 app4;
u32 sw_id_offset; u32 sw_id_offset_lo;
u32 reserved5; u32 sw_id_offset_hi;
u32 reserved6; 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(((u64)addr)); \
(bd)->field##_hi = upper_32_bits(((u64)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 nixge_tx_skb {
struct sk_buff *skb; struct sk_buff *skb;
dma_addr_t mapping; dma_addr_t mapping;
@ -176,6 +204,15 @@ static void nixge_dma_write_reg(struct nixge_priv *priv, off_t offset, u32 val)
writel(val, priv->dma_regs + offset); 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) static u32 nixge_dma_read_reg(const struct nixge_priv *priv, off_t offset)
{ {
return readl(priv->dma_regs + offset); return readl(priv->dma_regs + offset);
@ -202,13 +239,22 @@ static u32 nixge_ctrl_read_reg(struct nixge_priv *priv, off_t offset)
static void nixge_hw_dma_bd_release(struct net_device *ndev) static void nixge_hw_dma_bd_release(struct net_device *ndev)
{ {
struct nixge_priv *priv = netdev_priv(ndev); struct nixge_priv *priv = netdev_priv(ndev);
dma_addr_t phys_addr;
struct sk_buff *skb;
int i; int i;
for (i = 0; i < RX_BD_NUM; i++) { for (i = 0; i < RX_BD_NUM; i++) {
dma_unmap_single(ndev->dev.parent, priv->rx_bd_v[i].phys, phys_addr = nixge_hw_dma_bd_get_addr(&priv->rx_bd_v[i],
NIXGE_MAX_JUMBO_FRAME_SIZE, DMA_FROM_DEVICE); phys);
dev_kfree_skb((struct sk_buff *)
(priv->rx_bd_v[i].sw_id_offset)); dma_unmap_single(ndev->dev.parent, phys_addr,
NIXGE_MAX_JUMBO_FRAME_SIZE,
DMA_FROM_DEVICE);
skb = (struct sk_buff *)
nixge_hw_dma_bd_get_addr(&priv->rx_bd_v[i],
sw_id_offset);
dev_kfree_skb(skb);
} }
if (priv->rx_bd_v) if (priv->rx_bd_v)
@ -231,6 +277,7 @@ static int nixge_hw_dma_bd_init(struct net_device *ndev)
{ {
struct nixge_priv *priv = netdev_priv(ndev); struct nixge_priv *priv = netdev_priv(ndev);
struct sk_buff *skb; struct sk_buff *skb;
dma_addr_t phys;
u32 cr; u32 cr;
int i; int i;
@ -259,27 +306,30 @@ static int nixge_hw_dma_bd_init(struct net_device *ndev)
goto out; goto out;
for (i = 0; i < TX_BD_NUM; i++) { for (i = 0; i < TX_BD_NUM; i++) {
priv->tx_bd_v[i].next = priv->tx_bd_p + nixge_hw_dma_bd_set_next(&priv->tx_bd_v[i],
sizeof(*priv->tx_bd_v) * priv->tx_bd_p +
((i + 1) % TX_BD_NUM); sizeof(*priv->tx_bd_v) *
((i + 1) % TX_BD_NUM));
} }
for (i = 0; i < RX_BD_NUM; i++) { for (i = 0; i < RX_BD_NUM; i++) {
priv->rx_bd_v[i].next = priv->rx_bd_p + nixge_hw_dma_bd_set_next(&priv->rx_bd_v[i],
sizeof(*priv->rx_bd_v) * priv->rx_bd_p
((i + 1) % RX_BD_NUM); + sizeof(*priv->rx_bd_v) *
((i + 1) % RX_BD_NUM));
skb = netdev_alloc_skb_ip_align(ndev, skb = netdev_alloc_skb_ip_align(ndev,
NIXGE_MAX_JUMBO_FRAME_SIZE); NIXGE_MAX_JUMBO_FRAME_SIZE);
if (!skb) if (!skb)
goto out; goto out;
priv->rx_bd_v[i].sw_id_offset = (u32)skb; nixge_hw_dma_bd_set_offset(&priv->rx_bd_v[i], skb);
priv->rx_bd_v[i].phys = phys = dma_map_single(ndev->dev.parent, skb->data,
dma_map_single(ndev->dev.parent, NIXGE_MAX_JUMBO_FRAME_SIZE,
skb->data, DMA_FROM_DEVICE);
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; priv->rx_bd_v[i].cntrl = NIXGE_MAX_JUMBO_FRAME_SIZE;
} }
@ -312,18 +362,18 @@ static int nixge_hw_dma_bd_init(struct net_device *ndev)
/* Populate the tail pointer and bring the Rx Axi DMA engine out of /* Populate the tail pointer and bring the Rx Axi DMA engine out of
* halted state. This will make the Rx side ready for reception. * halted state. This will make the Rx side ready for reception.
*/ */
nixge_dma_write_reg(priv, XAXIDMA_RX_CDESC_OFFSET, priv->rx_bd_p); nixge_dma_write_desc_reg(priv, XAXIDMA_RX_CDESC_OFFSET, priv->rx_bd_p);
cr = nixge_dma_read_reg(priv, XAXIDMA_RX_CR_OFFSET); cr = nixge_dma_read_reg(priv, XAXIDMA_RX_CR_OFFSET);
nixge_dma_write_reg(priv, XAXIDMA_RX_CR_OFFSET, nixge_dma_write_reg(priv, XAXIDMA_RX_CR_OFFSET,
cr | XAXIDMA_CR_RUNSTOP_MASK); cr | XAXIDMA_CR_RUNSTOP_MASK);
nixge_dma_write_reg(priv, XAXIDMA_RX_TDESC_OFFSET, priv->rx_bd_p + nixge_dma_write_desc_reg(priv, XAXIDMA_RX_TDESC_OFFSET, priv->rx_bd_p +
(sizeof(*priv->rx_bd_v) * (RX_BD_NUM - 1))); (sizeof(*priv->rx_bd_v) * (RX_BD_NUM - 1)));
/* Write to the RS (Run-stop) bit in the Tx channel control register. /* 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 * Tx channel is now ready to run. But only after we write to the
* tail pointer register that the Tx channel will start transmitting. * tail pointer register that the Tx channel will start transmitting.
*/ */
nixge_dma_write_reg(priv, XAXIDMA_TX_CDESC_OFFSET, priv->tx_bd_p); nixge_dma_write_desc_reg(priv, XAXIDMA_TX_CDESC_OFFSET, priv->tx_bd_p);
cr = nixge_dma_read_reg(priv, XAXIDMA_TX_CR_OFFSET); cr = nixge_dma_read_reg(priv, XAXIDMA_TX_CR_OFFSET);
nixge_dma_write_reg(priv, XAXIDMA_TX_CR_OFFSET, nixge_dma_write_reg(priv, XAXIDMA_TX_CR_OFFSET,
cr | XAXIDMA_CR_RUNSTOP_MASK); cr | XAXIDMA_CR_RUNSTOP_MASK);
@ -451,7 +501,7 @@ static int nixge_start_xmit(struct sk_buff *skb, struct net_device *ndev)
struct nixge_priv *priv = netdev_priv(ndev); struct nixge_priv *priv = netdev_priv(ndev);
struct nixge_hw_dma_bd *cur_p; struct nixge_hw_dma_bd *cur_p;
struct nixge_tx_skb *tx_skb; struct nixge_tx_skb *tx_skb;
dma_addr_t tail_p; dma_addr_t tail_p, cur_phys;
skb_frag_t *frag; skb_frag_t *frag;
u32 num_frag; u32 num_frag;
u32 ii; u32 ii;
@ -466,15 +516,16 @@ static int nixge_start_xmit(struct sk_buff *skb, struct net_device *ndev)
return NETDEV_TX_OK; return NETDEV_TX_OK;
} }
cur_p->phys = dma_map_single(ndev->dev.parent, skb->data, cur_phys = dma_map_single(ndev->dev.parent, skb->data,
skb_headlen(skb), DMA_TO_DEVICE); skb_headlen(skb), DMA_TO_DEVICE);
if (dma_mapping_error(ndev->dev.parent, cur_p->phys)) if (dma_mapping_error(ndev->dev.parent, cur_phys))
goto drop; goto drop;
nixge_hw_dma_bd_set_phys(cur_p, cur_phys);
cur_p->cntrl = skb_headlen(skb) | XAXIDMA_BD_CTRL_TXSOF_MASK; cur_p->cntrl = skb_headlen(skb) | XAXIDMA_BD_CTRL_TXSOF_MASK;
tx_skb->skb = NULL; tx_skb->skb = NULL;
tx_skb->mapping = cur_p->phys; tx_skb->mapping = cur_phys;
tx_skb->size = skb_headlen(skb); tx_skb->size = skb_headlen(skb);
tx_skb->mapped_as_page = false; tx_skb->mapped_as_page = false;
@ -485,16 +536,17 @@ static int nixge_start_xmit(struct sk_buff *skb, struct net_device *ndev)
tx_skb = &priv->tx_skb[priv->tx_bd_tail]; tx_skb = &priv->tx_skb[priv->tx_bd_tail];
frag = &skb_shinfo(skb)->frags[ii]; frag = &skb_shinfo(skb)->frags[ii];
cur_p->phys = skb_frag_dma_map(ndev->dev.parent, frag, 0, cur_phys = skb_frag_dma_map(ndev->dev.parent, frag, 0,
skb_frag_size(frag), skb_frag_size(frag),
DMA_TO_DEVICE); DMA_TO_DEVICE);
if (dma_mapping_error(ndev->dev.parent, cur_p->phys)) if (dma_mapping_error(ndev->dev.parent, cur_phys))
goto frag_err; goto frag_err;
nixge_hw_dma_bd_set_phys(cur_p, cur_phys);
cur_p->cntrl = skb_frag_size(frag); cur_p->cntrl = skb_frag_size(frag);
tx_skb->skb = NULL; tx_skb->skb = NULL;
tx_skb->mapping = cur_p->phys; tx_skb->mapping = cur_phys;
tx_skb->size = skb_frag_size(frag); tx_skb->size = skb_frag_size(frag);
tx_skb->mapped_as_page = true; tx_skb->mapped_as_page = true;
} }
@ -506,7 +558,7 @@ static int nixge_start_xmit(struct sk_buff *skb, struct net_device *ndev)
tail_p = priv->tx_bd_p + sizeof(*priv->tx_bd_v) * priv->tx_bd_tail; tail_p = priv->tx_bd_p + sizeof(*priv->tx_bd_v) * priv->tx_bd_tail;
/* Start the transfer */ /* Start the transfer */
nixge_dma_write_reg(priv, XAXIDMA_TX_TDESC_OFFSET, tail_p); nixge_dma_write_desc_reg(priv, XAXIDMA_TX_TDESC_OFFSET, tail_p);
++priv->tx_bd_tail; ++priv->tx_bd_tail;
priv->tx_bd_tail %= TX_BD_NUM; priv->tx_bd_tail %= TX_BD_NUM;
@ -537,7 +589,7 @@ static int nixge_recv(struct net_device *ndev, int budget)
struct nixge_priv *priv = netdev_priv(ndev); struct nixge_priv *priv = netdev_priv(ndev);
struct sk_buff *skb, *new_skb; struct sk_buff *skb, *new_skb;
struct nixge_hw_dma_bd *cur_p; struct nixge_hw_dma_bd *cur_p;
dma_addr_t tail_p = 0; dma_addr_t tail_p = 0, cur_phys = 0;
u32 packets = 0; u32 packets = 0;
u32 length = 0; u32 length = 0;
u32 size = 0; u32 size = 0;
@ -549,13 +601,15 @@ static int nixge_recv(struct net_device *ndev, int budget)
tail_p = priv->rx_bd_p + sizeof(*priv->rx_bd_v) * tail_p = priv->rx_bd_p + sizeof(*priv->rx_bd_v) *
priv->rx_bd_ci; priv->rx_bd_ci;
skb = (struct sk_buff *)(cur_p->sw_id_offset); skb = (struct sk_buff *)nixge_hw_dma_bd_get_addr(cur_p,
sw_id_offset);
length = cur_p->status & XAXIDMA_BD_STS_ACTUAL_LEN_MASK; length = cur_p->status & XAXIDMA_BD_STS_ACTUAL_LEN_MASK;
if (length > NIXGE_MAX_JUMBO_FRAME_SIZE) if (length > NIXGE_MAX_JUMBO_FRAME_SIZE)
length = NIXGE_MAX_JUMBO_FRAME_SIZE; length = NIXGE_MAX_JUMBO_FRAME_SIZE;
dma_unmap_single(ndev->dev.parent, cur_p->phys, dma_unmap_single(ndev->dev.parent,
nixge_hw_dma_bd_get_addr(cur_p, phys),
NIXGE_MAX_JUMBO_FRAME_SIZE, NIXGE_MAX_JUMBO_FRAME_SIZE,
DMA_FROM_DEVICE); DMA_FROM_DEVICE);
@ -579,16 +633,17 @@ static int nixge_recv(struct net_device *ndev, int budget)
if (!new_skb) if (!new_skb)
return packets; return packets;
cur_p->phys = dma_map_single(ndev->dev.parent, new_skb->data, cur_phys = dma_map_single(ndev->dev.parent, new_skb->data,
NIXGE_MAX_JUMBO_FRAME_SIZE, NIXGE_MAX_JUMBO_FRAME_SIZE,
DMA_FROM_DEVICE); DMA_FROM_DEVICE);
if (dma_mapping_error(ndev->dev.parent, cur_p->phys)) { if (dma_mapping_error(ndev->dev.parent, cur_phys)) {
/* FIXME: bail out and clean up */ /* FIXME: bail out and clean up */
netdev_err(ndev, "Failed to map ...\n"); 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->cntrl = NIXGE_MAX_JUMBO_FRAME_SIZE;
cur_p->status = 0; cur_p->status = 0;
cur_p->sw_id_offset = (u32)new_skb; nixge_hw_dma_bd_set_offset(cur_p, new_skb);
++priv->rx_bd_ci; ++priv->rx_bd_ci;
priv->rx_bd_ci %= RX_BD_NUM; priv->rx_bd_ci %= RX_BD_NUM;
@ -599,7 +654,7 @@ static int nixge_recv(struct net_device *ndev, int budget)
ndev->stats.rx_bytes += size; ndev->stats.rx_bytes += size;
if (tail_p) if (tail_p)
nixge_dma_write_reg(priv, XAXIDMA_RX_TDESC_OFFSET, tail_p); nixge_dma_write_desc_reg(priv, XAXIDMA_RX_TDESC_OFFSET, tail_p);
return packets; return packets;
} }
@ -637,6 +692,7 @@ static irqreturn_t nixge_tx_irq(int irq, void *_ndev)
struct nixge_priv *priv = netdev_priv(_ndev); struct nixge_priv *priv = netdev_priv(_ndev);
struct net_device *ndev = _ndev; struct net_device *ndev = _ndev;
unsigned int status; unsigned int status;
dma_addr_t phys;
u32 cr; u32 cr;
status = nixge_dma_read_reg(priv, XAXIDMA_TX_SR_OFFSET); status = nixge_dma_read_reg(priv, XAXIDMA_TX_SR_OFFSET);
@ -650,9 +706,11 @@ static irqreturn_t nixge_tx_irq(int irq, void *_ndev)
return IRQ_NONE; return IRQ_NONE;
} }
if (status & XAXIDMA_IRQ_ERROR_MASK) { 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, "DMA Tx error 0x%x\n", status);
netdev_err(ndev, "Current BD is at: 0x%x\n", netdev_err(ndev, "Current BD is at: 0x%llx\n", (u64)phys);
(priv->tx_bd_v[priv->tx_bd_ci]).phys);
cr = nixge_dma_read_reg(priv, XAXIDMA_TX_CR_OFFSET); cr = nixge_dma_read_reg(priv, XAXIDMA_TX_CR_OFFSET);
/* Disable coalesce, delay timer and error interrupts */ /* Disable coalesce, delay timer and error interrupts */
@ -678,6 +736,7 @@ static irqreturn_t nixge_rx_irq(int irq, void *_ndev)
struct nixge_priv *priv = netdev_priv(_ndev); struct nixge_priv *priv = netdev_priv(_ndev);
struct net_device *ndev = _ndev; struct net_device *ndev = _ndev;
unsigned int status; unsigned int status;
dma_addr_t phys;
u32 cr; u32 cr;
status = nixge_dma_read_reg(priv, XAXIDMA_RX_SR_OFFSET); status = nixge_dma_read_reg(priv, XAXIDMA_RX_SR_OFFSET);
@ -697,9 +756,10 @@ static irqreturn_t nixge_rx_irq(int irq, void *_ndev)
return IRQ_NONE; return IRQ_NONE;
} }
if (status & XAXIDMA_IRQ_ERROR_MASK) { 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, "DMA Rx error 0x%x\n", status);
netdev_err(ndev, "Current BD is at: 0x%x\n", netdev_err(ndev, "Current BD is at: 0x%llx\n", (u64)phys);
(priv->rx_bd_v[priv->rx_bd_ci]).phys);
cr = nixge_dma_read_reg(priv, XAXIDMA_TX_CR_OFFSET); cr = nixge_dma_read_reg(priv, XAXIDMA_TX_CR_OFFSET);
/* Disable coalesce, delay timer and error interrupts */ /* Disable coalesce, delay timer and error interrupts */
@ -735,10 +795,10 @@ static void nixge_dma_err_handler(unsigned long data)
tx_skb = &lp->tx_skb[i]; tx_skb = &lp->tx_skb[i];
nixge_tx_skb_unmap(lp, tx_skb); nixge_tx_skb_unmap(lp, tx_skb);
cur_p->phys = 0; nixge_hw_dma_bd_set_phys(cur_p, 0);
cur_p->cntrl = 0; cur_p->cntrl = 0;
cur_p->status = 0; cur_p->status = 0;
cur_p->sw_id_offset = 0; nixge_hw_dma_bd_set_offset(cur_p, 0);
} }
for (i = 0; i < RX_BD_NUM; i++) { for (i = 0; i < RX_BD_NUM; i++) {
@ -779,18 +839,18 @@ static void nixge_dma_err_handler(unsigned long data)
/* Populate the tail pointer and bring the Rx Axi DMA engine out of /* Populate the tail pointer and bring the Rx Axi DMA engine out of
* halted state. This will make the Rx side ready for reception. * halted state. This will make the Rx side ready for reception.
*/ */
nixge_dma_write_reg(lp, XAXIDMA_RX_CDESC_OFFSET, lp->rx_bd_p); nixge_dma_write_desc_reg(lp, XAXIDMA_RX_CDESC_OFFSET, lp->rx_bd_p);
cr = nixge_dma_read_reg(lp, XAXIDMA_RX_CR_OFFSET); cr = nixge_dma_read_reg(lp, XAXIDMA_RX_CR_OFFSET);
nixge_dma_write_reg(lp, XAXIDMA_RX_CR_OFFSET, nixge_dma_write_reg(lp, XAXIDMA_RX_CR_OFFSET,
cr | XAXIDMA_CR_RUNSTOP_MASK); cr | XAXIDMA_CR_RUNSTOP_MASK);
nixge_dma_write_reg(lp, XAXIDMA_RX_TDESC_OFFSET, lp->rx_bd_p + nixge_dma_write_desc_reg(lp, XAXIDMA_RX_TDESC_OFFSET, lp->rx_bd_p +
(sizeof(*lp->rx_bd_v) * (RX_BD_NUM - 1))); (sizeof(*lp->rx_bd_v) * (RX_BD_NUM - 1)));
/* Write to the RS (Run-stop) bit in the Tx channel control register. /* 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 * Tx channel is now ready to run. But only after we write to the
* tail pointer register that the Tx channel will start transmitting * tail pointer register that the Tx channel will start transmitting
*/ */
nixge_dma_write_reg(lp, XAXIDMA_TX_CDESC_OFFSET, lp->tx_bd_p); nixge_dma_write_desc_reg(lp, XAXIDMA_TX_CDESC_OFFSET, lp->tx_bd_p);
cr = nixge_dma_read_reg(lp, XAXIDMA_TX_CR_OFFSET); cr = nixge_dma_read_reg(lp, XAXIDMA_TX_CR_OFFSET);
nixge_dma_write_reg(lp, XAXIDMA_TX_CR_OFFSET, nixge_dma_write_reg(lp, XAXIDMA_TX_CR_OFFSET,
cr | XAXIDMA_CR_RUNSTOP_MASK); cr | XAXIDMA_CR_RUNSTOP_MASK);