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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Faraday FTMAC100 10/100 Ethernet
*
* (C) Copyright 2009-2011 Faraday Technology
* Po-Yu Chuang <ratbert@faraday-tech.com>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/dma-mapping.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/mii.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/netdevice.h>
#include <linux/platform_device.h>
#include "ftmac100.h"
#define DRV_NAME "ftmac100"
#define DRV_VERSION "0.2"
#define RX_QUEUE_ENTRIES 128 /* must be power of 2 */
#define TX_QUEUE_ENTRIES 16 /* must be power of 2 */
#define MAX_PKT_SIZE 1518
#define RX_BUF_SIZE 2044 /* must be smaller than 0x7ff */
#if MAX_PKT_SIZE > 0x7ff
#error invalid MAX_PKT_SIZE
#endif
#if RX_BUF_SIZE > 0x7ff || RX_BUF_SIZE > PAGE_SIZE
#error invalid RX_BUF_SIZE
#endif
/******************************************************************************
* private data
*****************************************************************************/
struct ftmac100_descs {
struct ftmac100_rxdes rxdes[RX_QUEUE_ENTRIES];
struct ftmac100_txdes txdes[TX_QUEUE_ENTRIES];
};
struct ftmac100 {
struct resource *res;
void __iomem *base;
int irq;
struct ftmac100_descs *descs;
dma_addr_t descs_dma_addr;
unsigned int rx_pointer;
unsigned int tx_clean_pointer;
unsigned int tx_pointer;
unsigned int tx_pending;
spinlock_t tx_lock;
struct net_device *netdev;
struct device *dev;
struct napi_struct napi;
struct mii_if_info mii;
};
static int ftmac100_alloc_rx_page(struct ftmac100 *priv,
struct ftmac100_rxdes *rxdes, gfp_t gfp);
/******************************************************************************
* internal functions (hardware register access)
*****************************************************************************/
#define INT_MASK_ALL_ENABLED (FTMAC100_INT_RPKT_FINISH | \
FTMAC100_INT_NORXBUF | \
FTMAC100_INT_XPKT_OK | \
FTMAC100_INT_XPKT_LOST | \
FTMAC100_INT_RPKT_LOST | \
FTMAC100_INT_AHB_ERR | \
FTMAC100_INT_PHYSTS_CHG)
#define INT_MASK_ALL_DISABLED 0
static void ftmac100_enable_all_int(struct ftmac100 *priv)
{
iowrite32(INT_MASK_ALL_ENABLED, priv->base + FTMAC100_OFFSET_IMR);
}
static void ftmac100_disable_all_int(struct ftmac100 *priv)
{
iowrite32(INT_MASK_ALL_DISABLED, priv->base + FTMAC100_OFFSET_IMR);
}
static void ftmac100_set_rx_ring_base(struct ftmac100 *priv, dma_addr_t addr)
{
iowrite32(addr, priv->base + FTMAC100_OFFSET_RXR_BADR);
}
static void ftmac100_set_tx_ring_base(struct ftmac100 *priv, dma_addr_t addr)
{
iowrite32(addr, priv->base + FTMAC100_OFFSET_TXR_BADR);
}
static void ftmac100_txdma_start_polling(struct ftmac100 *priv)
{
iowrite32(1, priv->base + FTMAC100_OFFSET_TXPD);
}
static int ftmac100_reset(struct ftmac100 *priv)
{
struct net_device *netdev = priv->netdev;
int i;
/* NOTE: reset clears all registers */
iowrite32(FTMAC100_MACCR_SW_RST, priv->base + FTMAC100_OFFSET_MACCR);
for (i = 0; i < 5; i++) {
unsigned int maccr;
maccr = ioread32(priv->base + FTMAC100_OFFSET_MACCR);
if (!(maccr & FTMAC100_MACCR_SW_RST)) {
/*
* FTMAC100_MACCR_SW_RST cleared does not indicate
* that hardware reset completed (what the f*ck).
* We still need to wait for a while.
*/
udelay(500);
return 0;
}
udelay(1000);
}
netdev_err(netdev, "software reset failed\n");
return -EIO;
}
static void ftmac100_set_mac(struct ftmac100 *priv, const unsigned char *mac)
{
unsigned int maddr = mac[0] << 8 | mac[1];
unsigned int laddr = mac[2] << 24 | mac[3] << 16 | mac[4] << 8 | mac[5];
iowrite32(maddr, priv->base + FTMAC100_OFFSET_MAC_MADR);
iowrite32(laddr, priv->base + FTMAC100_OFFSET_MAC_LADR);
}
#define MACCR_ENABLE_ALL (FTMAC100_MACCR_XMT_EN | \
FTMAC100_MACCR_RCV_EN | \
FTMAC100_MACCR_XDMA_EN | \
FTMAC100_MACCR_RDMA_EN | \
FTMAC100_MACCR_CRC_APD | \
FTMAC100_MACCR_FULLDUP | \
FTMAC100_MACCR_RX_RUNT | \
FTMAC100_MACCR_RX_BROADPKT)
static int ftmac100_start_hw(struct ftmac100 *priv)
{
struct net_device *netdev = priv->netdev;
if (ftmac100_reset(priv))
return -EIO;
/* setup ring buffer base registers */
ftmac100_set_rx_ring_base(priv,
priv->descs_dma_addr +
offsetof(struct ftmac100_descs, rxdes));
ftmac100_set_tx_ring_base(priv,
priv->descs_dma_addr +
offsetof(struct ftmac100_descs, txdes));
iowrite32(FTMAC100_APTC_RXPOLL_CNT(1), priv->base + FTMAC100_OFFSET_APTC);
ftmac100_set_mac(priv, netdev->dev_addr);
iowrite32(MACCR_ENABLE_ALL, priv->base + FTMAC100_OFFSET_MACCR);
return 0;
}
static void ftmac100_stop_hw(struct ftmac100 *priv)
{
iowrite32(0, priv->base + FTMAC100_OFFSET_MACCR);
}
/******************************************************************************
* internal functions (receive descriptor)
*****************************************************************************/
static bool ftmac100_rxdes_first_segment(struct ftmac100_rxdes *rxdes)
{
return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_FRS);
}
static bool ftmac100_rxdes_last_segment(struct ftmac100_rxdes *rxdes)
{
return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_LRS);
}
static bool ftmac100_rxdes_owned_by_dma(struct ftmac100_rxdes *rxdes)
{
return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_RXDMA_OWN);
}
static void ftmac100_rxdes_set_dma_own(struct ftmac100_rxdes *rxdes)
{
/* clear status bits */
rxdes->rxdes0 = cpu_to_le32(FTMAC100_RXDES0_RXDMA_OWN);
}
static bool ftmac100_rxdes_rx_error(struct ftmac100_rxdes *rxdes)
{
return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_RX_ERR);
}
static bool ftmac100_rxdes_crc_error(struct ftmac100_rxdes *rxdes)
{
return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_CRC_ERR);
}
static bool ftmac100_rxdes_frame_too_long(struct ftmac100_rxdes *rxdes)
{
return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_FTL);
}
static bool ftmac100_rxdes_runt(struct ftmac100_rxdes *rxdes)
{
return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_RUNT);
}
static bool ftmac100_rxdes_odd_nibble(struct ftmac100_rxdes *rxdes)
{
return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_RX_ODD_NB);
}
static unsigned int ftmac100_rxdes_frame_length(struct ftmac100_rxdes *rxdes)
{
return le32_to_cpu(rxdes->rxdes0) & FTMAC100_RXDES0_RFL;
}
static bool ftmac100_rxdes_multicast(struct ftmac100_rxdes *rxdes)
{
return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_MULTICAST);
}
static void ftmac100_rxdes_set_buffer_size(struct ftmac100_rxdes *rxdes,
unsigned int size)
{
rxdes->rxdes1 &= cpu_to_le32(FTMAC100_RXDES1_EDORR);
rxdes->rxdes1 |= cpu_to_le32(FTMAC100_RXDES1_RXBUF_SIZE(size));
}
static void ftmac100_rxdes_set_end_of_ring(struct ftmac100_rxdes *rxdes)
{
rxdes->rxdes1 |= cpu_to_le32(FTMAC100_RXDES1_EDORR);
}
static void ftmac100_rxdes_set_dma_addr(struct ftmac100_rxdes *rxdes,
dma_addr_t addr)
{
rxdes->rxdes2 = cpu_to_le32(addr);
}
static dma_addr_t ftmac100_rxdes_get_dma_addr(struct ftmac100_rxdes *rxdes)
{
return le32_to_cpu(rxdes->rxdes2);
}
/*
* rxdes3 is not used by hardware. We use it to keep track of page.
* Since hardware does not touch it, we can skip cpu_to_le32()/le32_to_cpu().
*/
static void ftmac100_rxdes_set_page(struct ftmac100_rxdes *rxdes, struct page *page)
{
rxdes->rxdes3 = (unsigned int)page;
}
static struct page *ftmac100_rxdes_get_page(struct ftmac100_rxdes *rxdes)
{
return (struct page *)rxdes->rxdes3;
}
/******************************************************************************
* internal functions (receive)
*****************************************************************************/
static int ftmac100_next_rx_pointer(int pointer)
{
return (pointer + 1) & (RX_QUEUE_ENTRIES - 1);
}
static void ftmac100_rx_pointer_advance(struct ftmac100 *priv)
{
priv->rx_pointer = ftmac100_next_rx_pointer(priv->rx_pointer);
}
static struct ftmac100_rxdes *ftmac100_current_rxdes(struct ftmac100 *priv)
{
return &priv->descs->rxdes[priv->rx_pointer];
}
static struct ftmac100_rxdes *
ftmac100_rx_locate_first_segment(struct ftmac100 *priv)
{
struct ftmac100_rxdes *rxdes = ftmac100_current_rxdes(priv);
while (!ftmac100_rxdes_owned_by_dma(rxdes)) {
if (ftmac100_rxdes_first_segment(rxdes))
return rxdes;
ftmac100_rxdes_set_dma_own(rxdes);
ftmac100_rx_pointer_advance(priv);
rxdes = ftmac100_current_rxdes(priv);
}
return NULL;
}
static bool ftmac100_rx_packet_error(struct ftmac100 *priv,
struct ftmac100_rxdes *rxdes)
{
struct net_device *netdev = priv->netdev;
bool error = false;
if (unlikely(ftmac100_rxdes_rx_error(rxdes))) {
if (net_ratelimit())
netdev_info(netdev, "rx err\n");
netdev->stats.rx_errors++;
error = true;
}
if (unlikely(ftmac100_rxdes_crc_error(rxdes))) {
if (net_ratelimit())
netdev_info(netdev, "rx crc err\n");
netdev->stats.rx_crc_errors++;
error = true;
}
if (unlikely(ftmac100_rxdes_frame_too_long(rxdes))) {
if (net_ratelimit())
netdev_info(netdev, "rx frame too long\n");
netdev->stats.rx_length_errors++;
error = true;
} else if (unlikely(ftmac100_rxdes_runt(rxdes))) {
if (net_ratelimit())
netdev_info(netdev, "rx runt\n");
netdev->stats.rx_length_errors++;
error = true;
} else if (unlikely(ftmac100_rxdes_odd_nibble(rxdes))) {
if (net_ratelimit())
netdev_info(netdev, "rx odd nibble\n");
netdev->stats.rx_length_errors++;
error = true;
}
return error;
}
static void ftmac100_rx_drop_packet(struct ftmac100 *priv)
{
struct net_device *netdev = priv->netdev;
struct ftmac100_rxdes *rxdes = ftmac100_current_rxdes(priv);
bool done = false;
if (net_ratelimit())
netdev_dbg(netdev, "drop packet %p\n", rxdes);
do {
if (ftmac100_rxdes_last_segment(rxdes))
done = true;
ftmac100_rxdes_set_dma_own(rxdes);
ftmac100_rx_pointer_advance(priv);
rxdes = ftmac100_current_rxdes(priv);
} while (!done && !ftmac100_rxdes_owned_by_dma(rxdes));
netdev->stats.rx_dropped++;
}
static bool ftmac100_rx_packet(struct ftmac100 *priv, int *processed)
{
struct net_device *netdev = priv->netdev;
struct ftmac100_rxdes *rxdes;
struct sk_buff *skb;
struct page *page;
dma_addr_t map;
int length;
bool ret;
rxdes = ftmac100_rx_locate_first_segment(priv);
if (!rxdes)
return false;
if (unlikely(ftmac100_rx_packet_error(priv, rxdes))) {
ftmac100_rx_drop_packet(priv);
return true;
}
/*
* It is impossible to get multi-segment packets
* because we always provide big enough receive buffers.
*/
ret = ftmac100_rxdes_last_segment(rxdes);
BUG_ON(!ret);
/* start processing */
skb = netdev_alloc_skb_ip_align(netdev, 128);
if (unlikely(!skb)) {
if (net_ratelimit())
netdev_err(netdev, "rx skb alloc failed\n");
ftmac100_rx_drop_packet(priv);
return true;
}
if (unlikely(ftmac100_rxdes_multicast(rxdes)))
netdev->stats.multicast++;
map = ftmac100_rxdes_get_dma_addr(rxdes);
dma_unmap_page(priv->dev, map, RX_BUF_SIZE, DMA_FROM_DEVICE);
length = ftmac100_rxdes_frame_length(rxdes);
page = ftmac100_rxdes_get_page(rxdes);
skb_fill_page_desc(skb, 0, page, 0, length);
skb->len += length;
skb->data_len += length;
if (length > 128) {
skb->truesize += PAGE_SIZE;
/* We pull the minimum amount into linear part */
__pskb_pull_tail(skb, ETH_HLEN);
} else {
/* Small frames are copied into linear part to free one page */
__pskb_pull_tail(skb, length);
}
ftmac100_alloc_rx_page(priv, rxdes, GFP_ATOMIC);
ftmac100_rx_pointer_advance(priv);
skb->protocol = eth_type_trans(skb, netdev);
netdev->stats.rx_packets++;
netdev->stats.rx_bytes += skb->len;
/* push packet to protocol stack */
netif_receive_skb(skb);
(*processed)++;
return true;
}
/******************************************************************************
* internal functions (transmit descriptor)
*****************************************************************************/
static void ftmac100_txdes_reset(struct ftmac100_txdes *txdes)
{
/* clear all except end of ring bit */
txdes->txdes0 = 0;
txdes->txdes1 &= cpu_to_le32(FTMAC100_TXDES1_EDOTR);
txdes->txdes2 = 0;
txdes->txdes3 = 0;
}
static bool ftmac100_txdes_owned_by_dma(struct ftmac100_txdes *txdes)
{
return txdes->txdes0 & cpu_to_le32(FTMAC100_TXDES0_TXDMA_OWN);
}
static void ftmac100_txdes_set_dma_own(struct ftmac100_txdes *txdes)
{
/*
* Make sure dma own bit will not be set before any other
* descriptor fields.
*/
wmb();
txdes->txdes0 |= cpu_to_le32(FTMAC100_TXDES0_TXDMA_OWN);
}
static bool ftmac100_txdes_excessive_collision(struct ftmac100_txdes *txdes)
{
return txdes->txdes0 & cpu_to_le32(FTMAC100_TXDES0_TXPKT_EXSCOL);
}
static bool ftmac100_txdes_late_collision(struct ftmac100_txdes *txdes)
{
return txdes->txdes0 & cpu_to_le32(FTMAC100_TXDES0_TXPKT_LATECOL);
}
static void ftmac100_txdes_set_end_of_ring(struct ftmac100_txdes *txdes)
{
txdes->txdes1 |= cpu_to_le32(FTMAC100_TXDES1_EDOTR);
}
static void ftmac100_txdes_set_first_segment(struct ftmac100_txdes *txdes)
{
txdes->txdes1 |= cpu_to_le32(FTMAC100_TXDES1_FTS);
}
static void ftmac100_txdes_set_last_segment(struct ftmac100_txdes *txdes)
{
txdes->txdes1 |= cpu_to_le32(FTMAC100_TXDES1_LTS);
}
static void ftmac100_txdes_set_txint(struct ftmac100_txdes *txdes)
{
txdes->txdes1 |= cpu_to_le32(FTMAC100_TXDES1_TXIC);
}
static void ftmac100_txdes_set_buffer_size(struct ftmac100_txdes *txdes,
unsigned int len)
{
txdes->txdes1 |= cpu_to_le32(FTMAC100_TXDES1_TXBUF_SIZE(len));
}
static void ftmac100_txdes_set_dma_addr(struct ftmac100_txdes *txdes,
dma_addr_t addr)
{
txdes->txdes2 = cpu_to_le32(addr);
}
static dma_addr_t ftmac100_txdes_get_dma_addr(struct ftmac100_txdes *txdes)
{
return le32_to_cpu(txdes->txdes2);
}
/*
* txdes3 is not used by hardware. We use it to keep track of socket buffer.
* Since hardware does not touch it, we can skip cpu_to_le32()/le32_to_cpu().
*/
static void ftmac100_txdes_set_skb(struct ftmac100_txdes *txdes, struct sk_buff *skb)
{
txdes->txdes3 = (unsigned int)skb;
}
static struct sk_buff *ftmac100_txdes_get_skb(struct ftmac100_txdes *txdes)
{
return (struct sk_buff *)txdes->txdes3;
}
/******************************************************************************
* internal functions (transmit)
*****************************************************************************/
static int ftmac100_next_tx_pointer(int pointer)
{
return (pointer + 1) & (TX_QUEUE_ENTRIES - 1);
}
static void ftmac100_tx_pointer_advance(struct ftmac100 *priv)
{
priv->tx_pointer = ftmac100_next_tx_pointer(priv->tx_pointer);
}
static void ftmac100_tx_clean_pointer_advance(struct ftmac100 *priv)
{
priv->tx_clean_pointer = ftmac100_next_tx_pointer(priv->tx_clean_pointer);
}
static struct ftmac100_txdes *ftmac100_current_txdes(struct ftmac100 *priv)
{
return &priv->descs->txdes[priv->tx_pointer];
}
static struct ftmac100_txdes *ftmac100_current_clean_txdes(struct ftmac100 *priv)
{
return &priv->descs->txdes[priv->tx_clean_pointer];
}
static bool ftmac100_tx_complete_packet(struct ftmac100 *priv)
{
struct net_device *netdev = priv->netdev;
struct ftmac100_txdes *txdes;
struct sk_buff *skb;
dma_addr_t map;
if (priv->tx_pending == 0)
return false;
txdes = ftmac100_current_clean_txdes(priv);
if (ftmac100_txdes_owned_by_dma(txdes))
return false;
skb = ftmac100_txdes_get_skb(txdes);
map = ftmac100_txdes_get_dma_addr(txdes);
if (unlikely(ftmac100_txdes_excessive_collision(txdes) ||
ftmac100_txdes_late_collision(txdes))) {
/*
* packet transmitted to ethernet lost due to late collision
* or excessive collision
*/
netdev->stats.tx_aborted_errors++;
} else {
netdev->stats.tx_packets++;
netdev->stats.tx_bytes += skb->len;
}
dma_unmap_single(priv->dev, map, skb_headlen(skb), DMA_TO_DEVICE);
dev_kfree_skb(skb);
ftmac100_txdes_reset(txdes);
ftmac100_tx_clean_pointer_advance(priv);
spin_lock(&priv->tx_lock);
priv->tx_pending--;
spin_unlock(&priv->tx_lock);
netif_wake_queue(netdev);
return true;
}
static void ftmac100_tx_complete(struct ftmac100 *priv)
{
while (ftmac100_tx_complete_packet(priv))
;
}
static netdev_tx_t ftmac100_xmit(struct ftmac100 *priv, struct sk_buff *skb,
dma_addr_t map)
{
struct net_device *netdev = priv->netdev;
struct ftmac100_txdes *txdes;
unsigned int len = (skb->len < ETH_ZLEN) ? ETH_ZLEN : skb->len;
txdes = ftmac100_current_txdes(priv);
ftmac100_tx_pointer_advance(priv);
/* setup TX descriptor */
ftmac100_txdes_set_skb(txdes, skb);
ftmac100_txdes_set_dma_addr(txdes, map);
ftmac100_txdes_set_first_segment(txdes);
ftmac100_txdes_set_last_segment(txdes);
ftmac100_txdes_set_txint(txdes);
ftmac100_txdes_set_buffer_size(txdes, len);
spin_lock(&priv->tx_lock);
priv->tx_pending++;
if (priv->tx_pending == TX_QUEUE_ENTRIES)
netif_stop_queue(netdev);
/* start transmit */
ftmac100_txdes_set_dma_own(txdes);
spin_unlock(&priv->tx_lock);
ftmac100_txdma_start_polling(priv);
return NETDEV_TX_OK;
}
/******************************************************************************
* internal functions (buffer)
*****************************************************************************/
static int ftmac100_alloc_rx_page(struct ftmac100 *priv,
struct ftmac100_rxdes *rxdes, gfp_t gfp)
{
struct net_device *netdev = priv->netdev;
struct page *page;
dma_addr_t map;
page = alloc_page(gfp);
if (!page) {
if (net_ratelimit())
netdev_err(netdev, "failed to allocate rx page\n");
return -ENOMEM;
}
map = dma_map_page(priv->dev, page, 0, RX_BUF_SIZE, DMA_FROM_DEVICE);
if (unlikely(dma_mapping_error(priv->dev, map))) {
if (net_ratelimit())
netdev_err(netdev, "failed to map rx page\n");
__free_page(page);
return -ENOMEM;
}
ftmac100_rxdes_set_page(rxdes, page);
ftmac100_rxdes_set_dma_addr(rxdes, map);
ftmac100_rxdes_set_buffer_size(rxdes, RX_BUF_SIZE);
ftmac100_rxdes_set_dma_own(rxdes);
return 0;
}
static void ftmac100_free_buffers(struct ftmac100 *priv)
{
int i;
for (i = 0; i < RX_QUEUE_ENTRIES; i++) {
struct ftmac100_rxdes *rxdes = &priv->descs->rxdes[i];
struct page *page = ftmac100_rxdes_get_page(rxdes);
dma_addr_t map = ftmac100_rxdes_get_dma_addr(rxdes);
if (!page)
continue;
dma_unmap_page(priv->dev, map, RX_BUF_SIZE, DMA_FROM_DEVICE);
__free_page(page);
}
for (i = 0; i < TX_QUEUE_ENTRIES; i++) {
struct ftmac100_txdes *txdes = &priv->descs->txdes[i];
struct sk_buff *skb = ftmac100_txdes_get_skb(txdes);
dma_addr_t map = ftmac100_txdes_get_dma_addr(txdes);
if (!skb)
continue;
dma_unmap_single(priv->dev, map, skb_headlen(skb), DMA_TO_DEVICE);
dev_kfree_skb(skb);
}
dma_free_coherent(priv->dev, sizeof(struct ftmac100_descs),
priv->descs, priv->descs_dma_addr);
}
static int ftmac100_alloc_buffers(struct ftmac100 *priv)
{
int i;
priv->descs = dma_alloc_coherent(priv->dev,
sizeof(struct ftmac100_descs),
&priv->descs_dma_addr, GFP_KERNEL);
if (!priv->descs)
return -ENOMEM;
/* initialize RX ring */
ftmac100_rxdes_set_end_of_ring(&priv->descs->rxdes[RX_QUEUE_ENTRIES - 1]);
for (i = 0; i < RX_QUEUE_ENTRIES; i++) {
struct ftmac100_rxdes *rxdes = &priv->descs->rxdes[i];
if (ftmac100_alloc_rx_page(priv, rxdes, GFP_KERNEL))
goto err;
}
/* initialize TX ring */
ftmac100_txdes_set_end_of_ring(&priv->descs->txdes[TX_QUEUE_ENTRIES - 1]);
return 0;
err:
ftmac100_free_buffers(priv);
return -ENOMEM;
}
/******************************************************************************
* struct mii_if_info functions
*****************************************************************************/
static int ftmac100_mdio_read(struct net_device *netdev, int phy_id, int reg)
{
struct ftmac100 *priv = netdev_priv(netdev);
unsigned int phycr;
int i;
phycr = FTMAC100_PHYCR_PHYAD(phy_id) |
FTMAC100_PHYCR_REGAD(reg) |
FTMAC100_PHYCR_MIIRD;
iowrite32(phycr, priv->base + FTMAC100_OFFSET_PHYCR);
for (i = 0; i < 10; i++) {
phycr = ioread32(priv->base + FTMAC100_OFFSET_PHYCR);
if ((phycr & FTMAC100_PHYCR_MIIRD) == 0)
return phycr & FTMAC100_PHYCR_MIIRDATA;
udelay(100);
}
netdev_err(netdev, "mdio read timed out\n");
return 0;
}
static void ftmac100_mdio_write(struct net_device *netdev, int phy_id, int reg,
int data)
{
struct ftmac100 *priv = netdev_priv(netdev);
unsigned int phycr;
int i;
phycr = FTMAC100_PHYCR_PHYAD(phy_id) |
FTMAC100_PHYCR_REGAD(reg) |
FTMAC100_PHYCR_MIIWR;
data = FTMAC100_PHYWDATA_MIIWDATA(data);
iowrite32(data, priv->base + FTMAC100_OFFSET_PHYWDATA);
iowrite32(phycr, priv->base + FTMAC100_OFFSET_PHYCR);
for (i = 0; i < 10; i++) {
phycr = ioread32(priv->base + FTMAC100_OFFSET_PHYCR);
if ((phycr & FTMAC100_PHYCR_MIIWR) == 0)
return;
udelay(100);
}
netdev_err(netdev, "mdio write timed out\n");
}
/******************************************************************************
* struct ethtool_ops functions
*****************************************************************************/
static void ftmac100_get_drvinfo(struct net_device *netdev,
struct ethtool_drvinfo *info)
{
strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
strlcpy(info->version, DRV_VERSION, sizeof(info->version));
strlcpy(info->bus_info, dev_name(&netdev->dev), sizeof(info->bus_info));
}
static int ftmac100_get_link_ksettings(struct net_device *netdev,
struct ethtool_link_ksettings *cmd)
{
struct ftmac100 *priv = netdev_priv(netdev);
mii_ethtool_get_link_ksettings(&priv->mii, cmd);
return 0;
}
static int ftmac100_set_link_ksettings(struct net_device *netdev,
const struct ethtool_link_ksettings *cmd)
{
struct ftmac100 *priv = netdev_priv(netdev);
return mii_ethtool_set_link_ksettings(&priv->mii, cmd);
}
static int ftmac100_nway_reset(struct net_device *netdev)
{
struct ftmac100 *priv = netdev_priv(netdev);
return mii_nway_restart(&priv->mii);
}
static u32 ftmac100_get_link(struct net_device *netdev)
{
struct ftmac100 *priv = netdev_priv(netdev);
return mii_link_ok(&priv->mii);
}
static const struct ethtool_ops ftmac100_ethtool_ops = {
.get_drvinfo = ftmac100_get_drvinfo,
.nway_reset = ftmac100_nway_reset,
.get_link = ftmac100_get_link,
.get_link_ksettings = ftmac100_get_link_ksettings,
.set_link_ksettings = ftmac100_set_link_ksettings,
};
/******************************************************************************
* interrupt handler
*****************************************************************************/
static irqreturn_t ftmac100_interrupt(int irq, void *dev_id)
{
struct net_device *netdev = dev_id;
struct ftmac100 *priv = netdev_priv(netdev);
/* Disable interrupts for polling */
ftmac100_disable_all_int(priv);
if (likely(netif_running(netdev)))
napi_schedule(&priv->napi);
return IRQ_HANDLED;
}
/******************************************************************************
* struct napi_struct functions
*****************************************************************************/
static int ftmac100_poll(struct napi_struct *napi, int budget)
{
struct ftmac100 *priv = container_of(napi, struct ftmac100, napi);
struct net_device *netdev = priv->netdev;
unsigned int status;
bool completed = true;
int rx = 0;
status = ioread32(priv->base + FTMAC100_OFFSET_ISR);
if (status & (FTMAC100_INT_RPKT_FINISH | FTMAC100_INT_NORXBUF)) {
/*
* FTMAC100_INT_RPKT_FINISH:
* RX DMA has received packets into RX buffer successfully
*
* FTMAC100_INT_NORXBUF:
* RX buffer unavailable
*/
bool retry;
do {
retry = ftmac100_rx_packet(priv, &rx);
} while (retry && rx < budget);
if (retry && rx == budget)
completed = false;
}
if (status & (FTMAC100_INT_XPKT_OK | FTMAC100_INT_XPKT_LOST)) {
/*
* FTMAC100_INT_XPKT_OK:
* packet transmitted to ethernet successfully
*
* FTMAC100_INT_XPKT_LOST:
* packet transmitted to ethernet lost due to late
* collision or excessive collision
*/
ftmac100_tx_complete(priv);
}
if (status & (FTMAC100_INT_NORXBUF | FTMAC100_INT_RPKT_LOST |
FTMAC100_INT_AHB_ERR | FTMAC100_INT_PHYSTS_CHG)) {
if (net_ratelimit())
netdev_info(netdev, "[ISR] = 0x%x: %s%s%s%s\n", status,
status & FTMAC100_INT_NORXBUF ? "NORXBUF " : "",
status & FTMAC100_INT_RPKT_LOST ? "RPKT_LOST " : "",
status & FTMAC100_INT_AHB_ERR ? "AHB_ERR " : "",
status & FTMAC100_INT_PHYSTS_CHG ? "PHYSTS_CHG" : "");
if (status & FTMAC100_INT_NORXBUF) {
/* RX buffer unavailable */
netdev->stats.rx_over_errors++;
}
if (status & FTMAC100_INT_RPKT_LOST) {
/* received packet lost due to RX FIFO full */
netdev->stats.rx_fifo_errors++;
}
if (status & FTMAC100_INT_PHYSTS_CHG) {
/* PHY link status change */
mii_check_link(&priv->mii);
}
}
if (completed) {
/* stop polling */
napi_complete(napi);
ftmac100_enable_all_int(priv);
}
return rx;
}
/******************************************************************************
* struct net_device_ops functions
*****************************************************************************/
static int ftmac100_open(struct net_device *netdev)
{
struct ftmac100 *priv = netdev_priv(netdev);
int err;
err = ftmac100_alloc_buffers(priv);
if (err) {
netdev_err(netdev, "failed to allocate buffers\n");
goto err_alloc;
}
err = request_irq(priv->irq, ftmac100_interrupt, 0, netdev->name, netdev);
if (err) {
netdev_err(netdev, "failed to request irq %d\n", priv->irq);
goto err_irq;
}
priv->rx_pointer = 0;
priv->tx_clean_pointer = 0;
priv->tx_pointer = 0;
priv->tx_pending = 0;
err = ftmac100_start_hw(priv);
if (err)
goto err_hw;
napi_enable(&priv->napi);
netif_start_queue(netdev);
ftmac100_enable_all_int(priv);
return 0;
err_hw:
free_irq(priv->irq, netdev);
err_irq:
ftmac100_free_buffers(priv);
err_alloc:
return err;
}
static int ftmac100_stop(struct net_device *netdev)
{
struct ftmac100 *priv = netdev_priv(netdev);
ftmac100_disable_all_int(priv);
netif_stop_queue(netdev);
napi_disable(&priv->napi);
ftmac100_stop_hw(priv);
free_irq(priv->irq, netdev);
ftmac100_free_buffers(priv);
return 0;
}
static netdev_tx_t
ftmac100_hard_start_xmit(struct sk_buff *skb, struct net_device *netdev)
{
struct ftmac100 *priv = netdev_priv(netdev);
dma_addr_t map;
if (unlikely(skb->len > MAX_PKT_SIZE)) {
if (net_ratelimit())
netdev_dbg(netdev, "tx packet too big\n");
netdev->stats.tx_dropped++;
dev_kfree_skb(skb);
return NETDEV_TX_OK;
}
map = dma_map_single(priv->dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE);
if (unlikely(dma_mapping_error(priv->dev, map))) {
/* drop packet */
if (net_ratelimit())
netdev_err(netdev, "map socket buffer failed\n");
netdev->stats.tx_dropped++;
dev_kfree_skb(skb);
return NETDEV_TX_OK;
}
return ftmac100_xmit(priv, skb, map);
}
/* optional */
static int ftmac100_do_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
{
struct ftmac100 *priv = netdev_priv(netdev);
struct mii_ioctl_data *data = if_mii(ifr);
return generic_mii_ioctl(&priv->mii, data, cmd, NULL);
}
static const struct net_device_ops ftmac100_netdev_ops = {
.ndo_open = ftmac100_open,
.ndo_stop = ftmac100_stop,
.ndo_start_xmit = ftmac100_hard_start_xmit,
.ndo_set_mac_address = eth_mac_addr,
.ndo_validate_addr = eth_validate_addr,
.ndo_do_ioctl = ftmac100_do_ioctl,
};
/******************************************************************************
* struct platform_driver functions
*****************************************************************************/
static int ftmac100_probe(struct platform_device *pdev)
{
struct resource *res;
int irq;
struct net_device *netdev;
struct ftmac100 *priv;
int err;
if (!pdev)
return -ENODEV;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -ENXIO;
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;
/* setup net_device */
netdev = alloc_etherdev(sizeof(*priv));
if (!netdev) {
err = -ENOMEM;
goto err_alloc_etherdev;
}
SET_NETDEV_DEV(netdev, &pdev->dev);
netdev->ethtool_ops = &ftmac100_ethtool_ops;
netdev->netdev_ops = &ftmac100_netdev_ops;
platform_set_drvdata(pdev, netdev);
/* setup private data */
priv = netdev_priv(netdev);
priv->netdev = netdev;
priv->dev = &pdev->dev;
spin_lock_init(&priv->tx_lock);
/* initialize NAPI */
netif_napi_add(netdev, &priv->napi, ftmac100_poll, 64);
/* map io memory */
priv->res = request_mem_region(res->start, resource_size(res),
dev_name(&pdev->dev));
if (!priv->res) {
dev_err(&pdev->dev, "Could not reserve memory region\n");
err = -ENOMEM;
goto err_req_mem;
}
priv->base = ioremap(res->start, resource_size(res));
if (!priv->base) {
dev_err(&pdev->dev, "Failed to ioremap ethernet registers\n");
err = -EIO;
goto err_ioremap;
}
priv->irq = irq;
/* initialize struct mii_if_info */
priv->mii.phy_id = 0;
priv->mii.phy_id_mask = 0x1f;
priv->mii.reg_num_mask = 0x1f;
priv->mii.dev = netdev;
priv->mii.mdio_read = ftmac100_mdio_read;
priv->mii.mdio_write = ftmac100_mdio_write;
/* register network device */
err = register_netdev(netdev);
if (err) {
dev_err(&pdev->dev, "Failed to register netdev\n");
goto err_register_netdev;
}
netdev_info(netdev, "irq %d, mapped at %p\n", priv->irq, priv->base);
if (!is_valid_ether_addr(netdev->dev_addr)) {
eth_hw_addr_random(netdev);
netdev_info(netdev, "generated random MAC address %pM\n",
netdev->dev_addr);
}
return 0;
err_register_netdev:
iounmap(priv->base);
err_ioremap:
release_resource(priv->res);
err_req_mem:
netif_napi_del(&priv->napi);
free_netdev(netdev);
err_alloc_etherdev:
return err;
}
static int ftmac100_remove(struct platform_device *pdev)
{
struct net_device *netdev;
struct ftmac100 *priv;
netdev = platform_get_drvdata(pdev);
priv = netdev_priv(netdev);
unregister_netdev(netdev);
iounmap(priv->base);
release_resource(priv->res);
netif_napi_del(&priv->napi);
free_netdev(netdev);
return 0;
}
static const struct of_device_id ftmac100_of_ids[] = {
{ .compatible = "andestech,atmac100" },
{ }
};
static struct platform_driver ftmac100_driver = {
.probe = ftmac100_probe,
.remove = ftmac100_remove,
.driver = {
.name = DRV_NAME,
.of_match_table = ftmac100_of_ids
},
};
/******************************************************************************
* initialization / finalization
*****************************************************************************/
static int __init ftmac100_init(void)
{
pr_info("Loading version " DRV_VERSION " ...\n");
return platform_driver_register(&ftmac100_driver);
}
static void __exit ftmac100_exit(void)
{
platform_driver_unregister(&ftmac100_driver);
}
module_init(ftmac100_init);
module_exit(ftmac100_exit);
MODULE_AUTHOR("Po-Yu Chuang <ratbert@faraday-tech.com>");
MODULE_DESCRIPTION("FTMAC100 driver");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(of, ftmac100_of_ids);
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