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path: root/drivers/net/ethernet/xilinx/xilinx_emaclite.c
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Diffstat (limited to 'drivers/net/ethernet/xilinx/xilinx_emaclite.c')
-rw-r--r--drivers/net/ethernet/xilinx/xilinx_emaclite.c55
1 files changed, 18 insertions, 37 deletions
diff --git a/drivers/net/ethernet/xilinx/xilinx_emaclite.c b/drivers/net/ethernet/xilinx/xilinx_emaclite.c
index 57a24f62e353..7a86ae82fcc1 100644
--- a/drivers/net/ethernet/xilinx/xilinx_emaclite.c
+++ b/drivers/net/ethernet/xilinx/xilinx_emaclite.c
@@ -1,11 +1,10 @@
// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * Xilinx EmacLite Linux driver for the Xilinx Ethernet MAC Lite device.
+/* Xilinx EmacLite Linux driver for the Xilinx Ethernet MAC Lite device.
*
* This is a new flat driver which is based on the original emac_lite
* driver from John Williams <john.williams@xilinx.com>.
*
- * 2007 - 2013 (c) Xilinx, Inc.
+ * Copyright (c) 2007 - 2013 Xilinx, Inc.
*/
#include <linux/module.h>
@@ -91,13 +90,7 @@
#define XEL_ARP_PACKET_SIZE 28 /* Max ARP packet size */
#define XEL_HEADER_IP_LENGTH_OFFSET 16 /* IP Length Offset */
-
-
#define TX_TIMEOUT (60 * HZ) /* Tx timeout is 60 seconds. */
-#define ALIGNMENT 4
-
-/* BUFFER_ALIGN(adr) calculates the number of bytes to the next alignment. */
-#define BUFFER_ALIGN(adr) ((ALIGNMENT - ((uintptr_t)adr)) % ALIGNMENT)
#ifdef __BIG_ENDIAN
#define xemaclite_readl ioread32be
@@ -124,7 +117,6 @@
* @last_link: last link status
*/
struct net_local {
-
struct net_device *ndev;
bool tx_ping_pong;
@@ -133,7 +125,7 @@ struct net_local {
u32 next_rx_buf_to_use;
void __iomem *base_addr;
- spinlock_t reset_lock;
+ spinlock_t reset_lock; /* serialize xmit and tx_timeout execution */
struct sk_buff *deferred_skb;
struct phy_device *phy_dev;
@@ -144,7 +136,6 @@ struct net_local {
int last_link;
};
-
/*************************/
/* EmacLite driver calls */
/*************************/
@@ -207,7 +198,7 @@ static void xemaclite_disable_interrupts(struct net_local *drvdata)
* address in the EmacLite device.
*/
static void xemaclite_aligned_write(const void *src_ptr, u32 *dest_ptr,
- unsigned length)
+ unsigned int length)
{
const u16 *from_u16_ptr;
u32 align_buffer;
@@ -265,7 +256,7 @@ static void xemaclite_aligned_write(const void *src_ptr, u32 *dest_ptr,
* to a 16-bit aligned buffer.
*/
static void xemaclite_aligned_read(u32 *src_ptr, u8 *dest_ptr,
- unsigned length)
+ unsigned int length)
{
u16 *to_u16_ptr, *from_u16_ptr;
u32 *from_u32_ptr;
@@ -330,7 +321,6 @@ static int xemaclite_send_data(struct net_local *drvdata, u8 *data,
reg_data = xemaclite_readl(addr + XEL_TSR_OFFSET);
if ((reg_data & (XEL_TSR_XMIT_BUSY_MASK |
XEL_TSR_XMIT_ACTIVE_MASK)) == 0) {
-
/* Switch to next buffer if configured */
if (drvdata->tx_ping_pong != 0)
drvdata->next_tx_buf_to_use ^= XEL_BUFFER_OFFSET;
@@ -346,8 +336,9 @@ static int xemaclite_send_data(struct net_local *drvdata, u8 *data,
if ((reg_data & (XEL_TSR_XMIT_BUSY_MASK |
XEL_TSR_XMIT_ACTIVE_MASK)) != 0)
return -1; /* Buffers were full, return failure */
- } else
+ } else {
return -1; /* Buffer was full, return failure */
+ }
/* Write the frame to the buffer */
xemaclite_aligned_write(data, (u32 __force *)addr, byte_count);
@@ -423,7 +414,6 @@ static u16 xemaclite_recv_data(struct net_local *drvdata, u8 *data, int maxlen)
* or an IP packet or an ARP packet
*/
if (proto_type > ETH_DATA_LEN) {
-
if (proto_type == ETH_P_IP) {
length = ((ntohl(xemaclite_readl(addr +
XEL_HEADER_IP_LENGTH_OFFSET +
@@ -433,23 +423,25 @@ static u16 xemaclite_recv_data(struct net_local *drvdata, u8 *data, int maxlen)
length = min_t(u16, length, ETH_DATA_LEN);
length += ETH_HLEN + ETH_FCS_LEN;
- } else if (proto_type == ETH_P_ARP)
+ } else if (proto_type == ETH_P_ARP) {
length = XEL_ARP_PACKET_SIZE + ETH_HLEN + ETH_FCS_LEN;
- else
+ } else {
/* Field contains type other than IP or ARP, use max
* frame size and let user parse it
*/
length = ETH_FRAME_LEN + ETH_FCS_LEN;
- } else
+ }
+ } else {
/* Use the length in the frame, plus the header and trailer */
length = proto_type + ETH_HLEN + ETH_FCS_LEN;
+ }
if (WARN_ON(length > maxlen))
length = maxlen;
/* Read from the EmacLite device */
xemaclite_aligned_read((u32 __force *)(addr + XEL_RXBUFF_OFFSET),
- data, length);
+ data, length);
/* Acknowledge the frame */
reg_data = xemaclite_readl(addr + XEL_RSR_OFFSET);
@@ -599,11 +591,10 @@ static void xemaclite_rx_handler(struct net_device *dev)
{
struct net_local *lp = netdev_priv(dev);
struct sk_buff *skb;
- unsigned int align;
u32 len;
len = ETH_FRAME_LEN + ETH_FCS_LEN;
- skb = netdev_alloc_skb(dev, len + ALIGNMENT);
+ skb = netdev_alloc_skb(dev, len + NET_IP_ALIGN);
if (!skb) {
/* Couldn't get memory. */
dev->stats.rx_dropped++;
@@ -611,16 +602,7 @@ static void xemaclite_rx_handler(struct net_device *dev)
return;
}
- /* A new skb should have the data halfword aligned, but this code is
- * here just in case that isn't true. Calculate how many
- * bytes we should reserve to get the data to start on a word
- * boundary
- */
- align = BUFFER_ALIGN(skb->data);
- if (align)
- skb_reserve(skb, align);
-
- skb_reserve(skb, 2);
+ skb_reserve(skb, NET_IP_ALIGN);
len = xemaclite_recv_data(lp, (u8 *)skb->data, len);
@@ -671,8 +653,7 @@ static irqreturn_t xemaclite_interrupt(int irq, void *dev_id)
/* Check if the Transmission for the first buffer is completed */
tx_status = xemaclite_readl(base_addr + XEL_TSR_OFFSET);
if (((tx_status & XEL_TSR_XMIT_BUSY_MASK) == 0) &&
- (tx_status & XEL_TSR_XMIT_ACTIVE_MASK) != 0) {
-
+ (tx_status & XEL_TSR_XMIT_ACTIVE_MASK) != 0) {
tx_status &= ~XEL_TSR_XMIT_ACTIVE_MASK;
xemaclite_writel(tx_status, base_addr + XEL_TSR_OFFSET);
@@ -682,8 +663,7 @@ static irqreturn_t xemaclite_interrupt(int irq, void *dev_id)
/* Check if the Transmission for the second buffer is completed */
tx_status = xemaclite_readl(base_addr + XEL_BUFFER_OFFSET + XEL_TSR_OFFSET);
if (((tx_status & XEL_TSR_XMIT_BUSY_MASK) == 0) &&
- (tx_status & XEL_TSR_XMIT_ACTIVE_MASK) != 0) {
-
+ (tx_status & XEL_TSR_XMIT_ACTIVE_MASK) != 0) {
tx_status &= ~XEL_TSR_XMIT_ACTIVE_MASK;
xemaclite_writel(tx_status, base_addr + XEL_BUFFER_OFFSET +
XEL_TSR_OFFSET);
@@ -840,6 +820,7 @@ static int xemaclite_mdio_setup(struct net_local *lp, struct device *dev)
of_address_to_resource(npp, 0, &res);
if (lp->ndev->mem_start != res.start) {
struct phy_device *phydev;
+
phydev = of_phy_find_device(lp->phy_node);
if (!phydev)
dev_info(dev,
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