diff options
Diffstat (limited to 'drivers/net/ethernet/faraday/ftgmac100.c')
| -rw-r--r-- | drivers/net/ethernet/faraday/ftgmac100.c | 1365 |
1 files changed, 1365 insertions, 0 deletions
diff --git a/drivers/net/ethernet/faraday/ftgmac100.c b/drivers/net/ethernet/faraday/ftgmac100.c new file mode 100644 index 000000000000..54709af917e9 --- /dev/null +++ b/drivers/net/ethernet/faraday/ftgmac100.c @@ -0,0 +1,1365 @@ +/* + * Faraday FTGMAC100 Gigabit Ethernet + * + * (C) Copyright 2009-2011 Faraday Technology + * Po-Yu Chuang <ratbert@faraday-tech.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#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/io.h> +#include <linux/module.h> +#include <linux/netdevice.h> +#include <linux/phy.h> +#include <linux/platform_device.h> +#include <net/ip.h> + +#include "ftgmac100.h" + +#define DRV_NAME "ftgmac100" +#define DRV_VERSION "0.7" + +#define RX_QUEUE_ENTRIES 256 /* must be power of 2 */ +#define TX_QUEUE_ENTRIES 512 /* must be power of 2 */ + +#define MAX_PKT_SIZE 1518 +#define RX_BUF_SIZE PAGE_SIZE /* must be smaller than 0x3fff */ + +/****************************************************************************** + * private data + *****************************************************************************/ +struct ftgmac100_descs { + struct ftgmac100_rxdes rxdes[RX_QUEUE_ENTRIES]; + struct ftgmac100_txdes txdes[TX_QUEUE_ENTRIES]; +}; + +struct ftgmac100 { + struct resource *res; + void __iomem *base; + int irq; + + struct ftgmac100_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_bus *mii_bus; + int phy_irq[PHY_MAX_ADDR]; + struct phy_device *phydev; + int old_speed; +}; + +static int ftgmac100_alloc_rx_page(struct ftgmac100 *priv, + struct ftgmac100_rxdes *rxdes, gfp_t gfp); + +/****************************************************************************** + * internal functions (hardware register access) + *****************************************************************************/ +#define INT_MASK_ALL_ENABLED (FTGMAC100_INT_RPKT_LOST | \ + FTGMAC100_INT_XPKT_ETH | \ + FTGMAC100_INT_XPKT_LOST | \ + FTGMAC100_INT_AHB_ERR | \ + FTGMAC100_INT_PHYSTS_CHG | \ + FTGMAC100_INT_RPKT_BUF | \ + FTGMAC100_INT_NO_RXBUF) + +static void ftgmac100_set_rx_ring_base(struct ftgmac100 *priv, dma_addr_t addr) +{ + iowrite32(addr, priv->base + FTGMAC100_OFFSET_RXR_BADR); +} + +static void ftgmac100_set_rx_buffer_size(struct ftgmac100 *priv, + unsigned int size) +{ + size = FTGMAC100_RBSR_SIZE(size); + iowrite32(size, priv->base + FTGMAC100_OFFSET_RBSR); +} + +static void ftgmac100_set_normal_prio_tx_ring_base(struct ftgmac100 *priv, + dma_addr_t addr) +{ + iowrite32(addr, priv->base + FTGMAC100_OFFSET_NPTXR_BADR); +} + +static void ftgmac100_txdma_normal_prio_start_polling(struct ftgmac100 *priv) +{ + iowrite32(1, priv->base + FTGMAC100_OFFSET_NPTXPD); +} + +static int ftgmac100_reset_hw(struct ftgmac100 *priv) +{ + struct net_device *netdev = priv->netdev; + int i; + + /* NOTE: reset clears all registers */ + iowrite32(FTGMAC100_MACCR_SW_RST, priv->base + FTGMAC100_OFFSET_MACCR); + for (i = 0; i < 5; i++) { + unsigned int maccr; + + maccr = ioread32(priv->base + FTGMAC100_OFFSET_MACCR); + if (!(maccr & FTGMAC100_MACCR_SW_RST)) + return 0; + + udelay(1000); + } + + netdev_err(netdev, "software reset failed\n"); + return -EIO; +} + +static void ftgmac100_set_mac(struct ftgmac100 *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 + FTGMAC100_OFFSET_MAC_MADR); + iowrite32(laddr, priv->base + FTGMAC100_OFFSET_MAC_LADR); +} + +static void ftgmac100_init_hw(struct ftgmac100 *priv) +{ + /* setup ring buffer base registers */ + ftgmac100_set_rx_ring_base(priv, + priv->descs_dma_addr + + offsetof(struct ftgmac100_descs, rxdes)); + ftgmac100_set_normal_prio_tx_ring_base(priv, + priv->descs_dma_addr + + offsetof(struct ftgmac100_descs, txdes)); + + ftgmac100_set_rx_buffer_size(priv, RX_BUF_SIZE); + + iowrite32(FTGMAC100_APTC_RXPOLL_CNT(1), priv->base + FTGMAC100_OFFSET_APTC); + + ftgmac100_set_mac(priv, priv->netdev->dev_addr); +} + +#define MACCR_ENABLE_ALL (FTGMAC100_MACCR_TXDMA_EN | \ + FTGMAC100_MACCR_RXDMA_EN | \ + FTGMAC100_MACCR_TXMAC_EN | \ + FTGMAC100_MACCR_RXMAC_EN | \ + FTGMAC100_MACCR_FULLDUP | \ + FTGMAC100_MACCR_CRC_APD | \ + FTGMAC100_MACCR_RX_RUNT | \ + FTGMAC100_MACCR_RX_BROADPKT) + +static void ftgmac100_start_hw(struct ftgmac100 *priv, int speed) +{ + int maccr = MACCR_ENABLE_ALL; + + switch (speed) { + default: + case 10: + break; + + case 100: + maccr |= FTGMAC100_MACCR_FAST_MODE; + break; + + case 1000: + maccr |= FTGMAC100_MACCR_GIGA_MODE; + break; + } + + iowrite32(maccr, priv->base + FTGMAC100_OFFSET_MACCR); +} + +static void ftgmac100_stop_hw(struct ftgmac100 *priv) +{ + iowrite32(0, priv->base + FTGMAC100_OFFSET_MACCR); +} + +/****************************************************************************** + * internal functions (receive descriptor) + *****************************************************************************/ +static bool ftgmac100_rxdes_first_segment(struct ftgmac100_rxdes *rxdes) +{ + return rxdes->rxdes0 & cpu_to_le32(FTGMAC100_RXDES0_FRS); +} + +static bool ftgmac100_rxdes_last_segment(struct ftgmac100_rxdes *rxdes) +{ + return rxdes->rxdes0 & cpu_to_le32(FTGMAC100_RXDES0_LRS); +} + +static bool ftgmac100_rxdes_packet_ready(struct ftgmac100_rxdes *rxdes) +{ + return rxdes->rxdes0 & cpu_to_le32(FTGMAC100_RXDES0_RXPKT_RDY); +} + +static void ftgmac100_rxdes_set_dma_own(struct ftgmac100_rxdes *rxdes) +{ + /* clear status bits */ + rxdes->rxdes0 &= cpu_to_le32(FTGMAC100_RXDES0_EDORR); +} + +static bool ftgmac100_rxdes_rx_error(struct ftgmac100_rxdes *rxdes) +{ + return rxdes->rxdes0 & cpu_to_le32(FTGMAC100_RXDES0_RX_ERR); +} + +static bool ftgmac100_rxdes_crc_error(struct ftgmac100_rxdes *rxdes) +{ + return rxdes->rxdes0 & cpu_to_le32(FTGMAC100_RXDES0_CRC_ERR); +} + +static bool ftgmac100_rxdes_frame_too_long(struct ftgmac100_rxdes *rxdes) +{ + return rxdes->rxdes0 & cpu_to_le32(FTGMAC100_RXDES0_FTL); +} + +static bool ftgmac100_rxdes_runt(struct ftgmac100_rxdes *rxdes) +{ + return rxdes->rxdes0 & cpu_to_le32(FTGMAC100_RXDES0_RUNT); +} + +static bool ftgmac100_rxdes_odd_nibble(struct ftgmac100_rxdes *rxdes) +{ + return rxdes->rxdes0 & cpu_to_le32(FTGMAC100_RXDES0_RX_ODD_NB); +} + +static unsigned int ftgmac100_rxdes_data_length(struct ftgmac100_rxdes *rxdes) +{ + return le32_to_cpu(rxdes->rxdes0) & FTGMAC100_RXDES0_VDBC; +} + +static bool ftgmac100_rxdes_multicast(struct ftgmac100_rxdes *rxdes) +{ + return rxdes->rxdes0 & cpu_to_le32(FTGMAC100_RXDES0_MULTICAST); +} + +static void ftgmac100_rxdes_set_end_of_ring(struct ftgmac100_rxdes *rxdes) +{ + rxdes->rxdes0 |= cpu_to_le32(FTGMAC100_RXDES0_EDORR); +} + +static void ftgmac100_rxdes_set_dma_addr(struct ftgmac100_rxdes *rxdes, + dma_addr_t addr) +{ + rxdes->rxdes3 = cpu_to_le32(addr); +} + +static dma_addr_t ftgmac100_rxdes_get_dma_addr(struct ftgmac100_rxdes *rxdes) +{ + return le32_to_cpu(rxdes->rxdes3); +} + +static bool ftgmac100_rxdes_is_tcp(struct ftgmac100_rxdes *rxdes) +{ + return (rxdes->rxdes1 & cpu_to_le32(FTGMAC100_RXDES1_PROT_MASK)) == + cpu_to_le32(FTGMAC100_RXDES1_PROT_TCPIP); +} + +static bool ftgmac100_rxdes_is_udp(struct ftgmac100_rxdes *rxdes) +{ + return (rxdes->rxdes1 & cpu_to_le32(FTGMAC100_RXDES1_PROT_MASK)) == + cpu_to_le32(FTGMAC100_RXDES1_PROT_UDPIP); +} + +static bool ftgmac100_rxdes_tcpcs_err(struct ftgmac100_rxdes *rxdes) +{ + return rxdes->rxdes1 & cpu_to_le32(FTGMAC100_RXDES1_TCP_CHKSUM_ERR); +} + +static bool ftgmac100_rxdes_udpcs_err(struct ftgmac100_rxdes *rxdes) +{ + return rxdes->rxdes1 & cpu_to_le32(FTGMAC100_RXDES1_UDP_CHKSUM_ERR); +} + +static bool ftgmac100_rxdes_ipcs_err(struct ftgmac100_rxdes *rxdes) +{ + return rxdes->rxdes1 & cpu_to_le32(FTGMAC100_RXDES1_IP_CHKSUM_ERR); +} + +/* + * rxdes2 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 ftgmac100_rxdes_set_page(struct ftgmac100_rxdes *rxdes, struct page *page) +{ + rxdes->rxdes2 = (unsigned int)page; +} + +static struct page *ftgmac100_rxdes_get_page(struct ftgmac100_rxdes *rxdes) +{ + return (struct page *)rxdes->rxdes2; +} + +/****************************************************************************** + * internal functions (receive) + *****************************************************************************/ +static int ftgmac100_next_rx_pointer(int pointer) +{ + return (pointer + 1) & (RX_QUEUE_ENTRIES - 1); +} + +static void ftgmac100_rx_pointer_advance(struct ftgmac100 *priv) +{ + priv->rx_pointer = ftgmac100_next_rx_pointer(priv->rx_pointer); +} + +static struct ftgmac100_rxdes *ftgmac100_current_rxdes(struct ftgmac100 *priv) +{ + return &priv->descs->rxdes[priv->rx_pointer]; +} + +static struct ftgmac100_rxdes * +ftgmac100_rx_locate_first_segment(struct ftgmac100 *priv) +{ + struct ftgmac100_rxdes *rxdes = ftgmac100_current_rxdes(priv); + + while (ftgmac100_rxdes_packet_ready(rxdes)) { + if (ftgmac100_rxdes_first_segment(rxdes)) + return rxdes; + + ftgmac100_rxdes_set_dma_own(rxdes); + ftgmac100_rx_pointer_advance(priv); + rxdes = ftgmac100_current_rxdes(priv); + } + + return NULL; +} + +static bool ftgmac100_rx_packet_error(struct ftgmac100 *priv, + struct ftgmac100_rxdes *rxdes) +{ + struct net_device *netdev = priv->netdev; + bool error = false; + + if (unlikely(ftgmac100_rxdes_rx_error(rxdes))) { + if (net_ratelimit()) + netdev_info(netdev, "rx err\n"); + + netdev->stats.rx_errors++; + error = true; + } + + if (unlikely(ftgmac100_rxdes_crc_error(rxdes))) { + if (net_ratelimit()) + netdev_info(netdev, "rx crc err\n"); + + netdev->stats.rx_crc_errors++; + error = true; + } else if (unlikely(ftgmac100_rxdes_ipcs_err(rxdes))) { + if (net_ratelimit()) + netdev_info(netdev, "rx IP checksum err\n"); + + error = true; + } + + if (unlikely(ftgmac100_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(ftgmac100_rxdes_runt(rxdes))) { + if (net_ratelimit()) + netdev_info(netdev, "rx runt\n"); + + netdev->stats.rx_length_errors++; + error = true; + } else if (unlikely(ftgmac100_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 ftgmac100_rx_drop_packet(struct ftgmac100 *priv) +{ + struct net_device *netdev = priv->netdev; + struct ftgmac100_rxdes *rxdes = ftgmac100_current_rxdes(priv); + bool done = false; + + if (net_ratelimit()) + netdev_dbg(netdev, "drop packet %p\n", rxdes); + + do { + if (ftgmac100_rxdes_last_segment(rxdes)) + done = true; + + ftgmac100_rxdes_set_dma_own(rxdes); + ftgmac100_rx_pointer_advance(priv); + rxdes = ftgmac100_current_rxdes(priv); + } while (!done && ftgmac100_rxdes_packet_ready(rxdes)); + + netdev->stats.rx_dropped++; +} + +static bool ftgmac100_rx_packet(struct ftgmac100 *priv, int *processed) +{ + struct net_device *netdev = priv->netdev; + struct ftgmac100_rxdes *rxdes; + struct sk_buff *skb; + bool done = false; + + rxdes = ftgmac100_rx_locate_first_segment(priv); + if (!rxdes) + return false; + + if (unlikely(ftgmac100_rx_packet_error(priv, rxdes))) { + ftgmac100_rx_drop_packet(priv); + return true; + } + + /* start processing */ + skb = netdev_alloc_skb_ip_align(netdev, 128); + if (unlikely(!skb)) { + if (net_ratelimit()) + netdev_err(netdev, "rx skb alloc failed\n"); + + ftgmac100_rx_drop_packet(priv); + return true; + } + + if (unlikely(ftgmac100_rxdes_multicast(rxdes))) + netdev->stats.multicast++; + + /* + * It seems that HW does checksum incorrectly with fragmented packets, + * so we are conservative here - if HW checksum error, let software do + * the checksum again. + */ + if ((ftgmac100_rxdes_is_tcp(rxdes) && !ftgmac100_rxdes_tcpcs_err(rxdes)) || + (ftgmac100_rxdes_is_udp(rxdes) && !ftgmac100_rxdes_udpcs_err(rxdes))) + skb->ip_summed = CHECKSUM_UNNECESSARY; + + do { + dma_addr_t map = ftgmac100_rxdes_get_dma_addr(rxdes); + struct page *page = ftgmac100_rxdes_get_page(rxdes); + unsigned int size; + + dma_unmap_page(priv->dev, map, RX_BUF_SIZE, DMA_FROM_DEVICE); + + size = ftgmac100_rxdes_data_length(rxdes); + skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags, page, 0, size); + + skb->len += size; + skb->data_len += size; + skb->truesize += size; + + if (ftgmac100_rxdes_last_segment(rxdes)) + done = true; + + ftgmac100_alloc_rx_page(priv, rxdes, GFP_ATOMIC); + + ftgmac100_rx_pointer_advance(priv); + rxdes = ftgmac100_current_rxdes(priv); + } while (!done); + + __pskb_pull_tail(skb, min(skb->len, 64U)); + skb->protocol = eth_type_trans(skb, netdev); + + netdev->stats.rx_packets++; + netdev->stats.rx_bytes += skb->len; + + /* push packet to protocol stack */ + napi_gro_receive(&priv->napi, skb); + + (*processed)++; + return true; +} + +/****************************************************************************** + * internal functions (transmit descriptor) + *****************************************************************************/ +static void ftgmac100_txdes_reset(struct ftgmac100_txdes *txdes) +{ + /* clear all except end of ring bit */ + txdes->txdes0 &= cpu_to_le32(FTGMAC100_TXDES0_EDOTR); + txdes->txdes1 = 0; + txdes->txdes2 = 0; + txdes->txdes3 = 0; +} + +static bool ftgmac100_txdes_owned_by_dma(struct ftgmac100_txdes *txdes) +{ + return txdes->txdes0 & cpu_to_le32(FTGMAC100_TXDES0_TXDMA_OWN); +} + +static void ftgmac100_txdes_set_dma_own(struct ftgmac100_txdes *txdes) +{ + /* + * Make sure dma own bit will not be set before any other + * descriptor fields. + */ + wmb(); + txdes->txdes0 |= cpu_to_le32(FTGMAC100_TXDES0_TXDMA_OWN); +} + +static void ftgmac100_txdes_set_end_of_ring(struct ftgmac100_txdes *txdes) +{ + txdes->txdes0 |= cpu_to_le32(FTGMAC100_TXDES0_EDOTR); +} + +static void ftgmac100_txdes_set_first_segment(struct ftgmac100_txdes *txdes) +{ + txdes->txdes0 |= cpu_to_le32(FTGMAC100_TXDES0_FTS); +} + +static void ftgmac100_txdes_set_last_segment(struct ftgmac100_txdes *txdes) +{ + txdes->txdes0 |= cpu_to_le32(FTGMAC100_TXDES0_LTS); +} + +static void ftgmac100_txdes_set_buffer_size(struct ftgmac100_txdes *txdes, + unsigned int len) +{ + txdes->txdes0 |= cpu_to_le32(FTGMAC100_TXDES0_TXBUF_SIZE(len)); +} + +static void ftgmac100_txdes_set_txint(struct ftgmac100_txdes *txdes) +{ + txdes->txdes1 |= cpu_to_le32(FTGMAC100_TXDES1_TXIC); +} + +static void ftgmac100_txdes_set_tcpcs(struct ftgmac100_txdes *txdes) +{ + txdes->txdes1 |= cpu_to_le32(FTGMAC100_TXDES1_TCP_CHKSUM); +} + +static void ftgmac100_txdes_set_udpcs(struct ftgmac100_txdes *txdes) +{ + txdes->txdes1 |= cpu_to_le32(FTGMAC100_TXDES1_UDP_CHKSUM); +} + +static void ftgmac100_txdes_set_ipcs(struct ftgmac100_txdes *txdes) +{ + txdes->txdes1 |= cpu_to_le32(FTGMAC100_TXDES1_IP_CHKSUM); +} + +static void ftgmac100_txdes_set_dma_addr(struct ftgmac100_txdes *txdes, + dma_addr_t addr) +{ + txdes->txdes3 = cpu_to_le32(addr); +} + +static dma_addr_t ftgmac100_txdes_get_dma_addr(struct ftgmac100_txdes *txdes) +{ + return le32_to_cpu(txdes->txdes3); +} + +/* + * txdes2 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 ftgmac100_txdes_set_skb(struct ftgmac100_txdes *txdes, + struct sk_buff *skb) +{ + txdes->txdes2 = (unsigned int)skb; +} + +static struct sk_buff *ftgmac100_txdes_get_skb(struct ftgmac100_txdes *txdes) +{ + return (struct sk_buff *)txdes->txdes2; +} + +/****************************************************************************** + * internal functions (transmit) + *****************************************************************************/ +static int ftgmac100_next_tx_pointer(int pointer) +{ + return (pointer + 1) & (TX_QUEUE_ENTRIES - 1); +} + +static void ftgmac100_tx_pointer_advance(struct ftgmac100 *priv) +{ + priv->tx_pointer = ftgmac100_next_tx_pointer(priv->tx_pointer); +} + +static void ftgmac100_tx_clean_pointer_advance(struct ftgmac100 *priv) +{ + priv->tx_clean_pointer = ftgmac100_next_tx_pointer(priv->tx_clean_pointer); +} + +static struct ftgmac100_txdes *ftgmac100_current_txdes(struct ftgmac100 *priv) +{ + return &priv->descs->txdes[priv->tx_pointer]; +} + +static struct ftgmac100_txdes * +ftgmac100_current_clean_txdes(struct ftgmac100 *priv) +{ + return &priv->descs->txdes[priv->tx_clean_pointer]; +} + +static bool ftgmac100_tx_complete_packet(struct ftgmac100 *priv) +{ + struct net_device *netdev = priv->netdev; + struct ftgmac100_txdes *txdes; + struct sk_buff *skb; + dma_addr_t map; + + if (priv->tx_pending == 0) + return false; + + txdes = ftgmac100_current_clean_txdes(priv); + + if (ftgmac100_txdes_owned_by_dma(txdes)) + return false; + + skb = ftgmac100_txdes_get_skb(txdes); + map = ftgmac100_txdes_get_dma_addr(txdes); + + 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); + + ftgmac100_txdes_reset(txdes); + + ftgmac100_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 ftgmac100_tx_complete(struct ftgmac100 *priv) +{ + while (ftgmac100_tx_complete_packet(priv)) + ; +} + +static int ftgmac100_xmit(struct ftgmac100 *priv, struct sk_buff *skb, + dma_addr_t map) +{ + struct net_device *netdev = priv->netdev; + struct ftgmac100_txdes *txdes; + unsigned int len = (skb->len < ETH_ZLEN) ? ETH_ZLEN : skb->len; + + txdes = ftgmac100_current_txdes(priv); + ftgmac100_tx_pointer_advance(priv); + + /* setup TX descriptor */ + ftgmac100_txdes_set_skb(txdes, skb); + ftgmac100_txdes_set_dma_addr(txdes, map); + ftgmac100_txdes_set_buffer_size(txdes, len); + + ftgmac100_txdes_set_first_segment(txdes); + ftgmac100_txdes_set_last_segment(txdes); + ftgmac100_txdes_set_txint(txdes); + if (skb->ip_summed == CHECKSUM_PARTIAL) { + __be16 protocol = skb->protocol; + + if (protocol == cpu_to_be16(ETH_P_IP)) { + u8 ip_proto = ip_hdr(skb)->protocol; + + ftgmac100_txdes_set_ipcs(txdes); + if (ip_proto == IPPROTO_TCP) + ftgmac100_txdes_set_tcpcs(txdes); + else if (ip_proto == IPPROTO_UDP) + ftgmac100_txdes_set_udpcs(txdes); + } + } + + spin_lock(&priv->tx_lock); + priv->tx_pending++; + if (priv->tx_pending == TX_QUEUE_ENTRIES) + netif_stop_queue(netdev); + + /* start transmit */ + ftgmac100_txdes_set_dma_own(txdes); + spin_unlock(&priv->tx_lock); + + ftgmac100_txdma_normal_prio_start_polling(priv); + + return NETDEV_TX_OK; +} + +/****************************************************************************** + * internal functions (buffer) + *****************************************************************************/ +static int ftgmac100_alloc_rx_page(struct ftgmac100 *priv, + struct ftgmac100_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; + } + + ftgmac100_rxdes_set_page(rxdes, page); + ftgmac100_rxdes_set_dma_addr(rxdes, map); + ftgmac100_rxdes_set_dma_own(rxdes); + return 0; +} + +static void ftgmac100_free_buffers(struct ftgmac100 *priv) +{ + int i; + + for (i = 0; i < RX_QUEUE_ENTRIES; i++) { + struct ftgmac100_rxdes *rxdes = &priv->descs->rxdes[i]; + struct page *page = ftgmac100_rxdes_get_page(rxdes); + dma_addr_t map = ftgmac100_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 ftgmac100_txdes *txdes = &priv->descs->txdes[i]; + struct sk_buff *skb = ftgmac100_txdes_get_skb(txdes); + dma_addr_t map = ftgmac100_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 ftgmac100_descs), + priv->descs, priv->descs_dma_addr); +} + +static int ftgmac100_alloc_buffers(struct ftgmac100 *priv) +{ + int i; + + priv->descs = dma_alloc_coherent(priv->dev, + sizeof(struct ftgmac100_descs), + &priv->descs_dma_addr, GFP_KERNEL); + if (!priv->descs) + return -ENOMEM; + + memset(priv->descs, 0, sizeof(struct ftgmac100_descs)); + + /* initialize RX ring */ + ftgmac100_rxdes_set_end_of_ring(&priv->descs->rxdes[RX_QUEUE_ENTRIES - 1]); + + for (i = 0; i < RX_QUEUE_ENTRIES; i++) { + struct ftgmac100_rxdes *rxdes = &priv->descs->rxdes[i]; + + if (ftgmac100_alloc_rx_page(priv, rxdes, GFP_KERNEL)) + goto err; + } + + /* initialize TX ring */ + ftgmac100_txdes_set_end_of_ring(&priv->descs->txdes[TX_QUEUE_ENTRIES - 1]); + return 0; + +err: + ftgmac100_free_buffers(priv); + return -ENOMEM; +} + +/****************************************************************************** + * internal functions (mdio) + *****************************************************************************/ +static void ftgmac100_adjust_link(struct net_device *netdev) +{ + struct ftgmac100 *priv = netdev_priv(netdev); + struct phy_device *phydev = priv->phydev; + int ier; + + if (phydev->speed == priv->old_speed) + return; + + priv->old_speed = phydev->speed; + + ier = ioread32(priv->base + FTGMAC100_OFFSET_IER); + + /* disable all interrupts */ + iowrite32(0, priv->base + FTGMAC100_OFFSET_IER); + + netif_stop_queue(netdev); + ftgmac100_stop_hw(priv); + + netif_start_queue(netdev); + ftgmac100_init_hw(priv); + ftgmac100_start_hw(priv, phydev->speed); + + /* re-enable interrupts */ + iowrite32(ier, priv->base + FTGMAC100_OFFSET_IER); +} + +static int ftgmac100_mii_probe(struct ftgmac100 *priv) +{ + struct net_device *netdev = priv->netdev; + struct phy_device *phydev = NULL; + int i; + + /* search for connect PHY device */ + for (i = 0; i < PHY_MAX_ADDR; i++) { + struct phy_device *tmp = priv->mii_bus->phy_map[i]; + + if (tmp) { + phydev = tmp; + break; + } + } + + /* now we are supposed to have a proper phydev, to attach to... */ + if (!phydev) { + netdev_info(netdev, "%s: no PHY found\n", netdev->name); + return -ENODEV; + } + + phydev = phy_connect(netdev, dev_name(&phydev->dev), + &ftgmac100_adjust_link, 0, + PHY_INTERFACE_MODE_GMII); + + if (IS_ERR(phydev)) { + netdev_err(netdev, "%s: Could not attach to PHY\n", netdev->name); + return PTR_ERR(phydev); + } + + priv->phydev = phydev; + return 0; +} + +/****************************************************************************** + * struct mii_bus functions + *****************************************************************************/ +static int ftgmac100_mdiobus_read(struct mii_bus *bus, int phy_addr, int regnum) +{ + struct net_device *netdev = bus->priv; + struct ftgmac100 *priv = netdev_priv(netdev); + unsigned int phycr; + int i; + + phycr = ioread32(priv->base + FTGMAC100_OFFSET_PHYCR); + + /* preserve MDC cycle threshold */ + phycr &= FTGMAC100_PHYCR_MDC_CYCTHR_MASK; + + phycr |= FTGMAC100_PHYCR_PHYAD(phy_addr) | + FTGMAC100_PHYCR_REGAD(regnum) | + FTGMAC100_PHYCR_MIIRD; + + iowrite32(phycr, priv->base + FTGMAC100_OFFSET_PHYCR); + + for (i = 0; i < 10; i++) { + phycr = ioread32(priv->base + FTGMAC100_OFFSET_PHYCR); + + if ((phycr & FTGMAC100_PHYCR_MIIRD) == 0) { + int data; + + data = ioread32(priv->base + FTGMAC100_OFFSET_PHYDATA); + return FTGMAC100_PHYDATA_MIIRDATA(data); + } + + udelay(100); + } + + netdev_err(netdev, "mdio read timed out\n"); + return -EIO; +} + +static int ftgmac100_mdiobus_write(struct mii_bus *bus, int phy_addr, + int regnum, u16 value) +{ + struct net_device *netdev = bus->priv; + struct ftgmac100 *priv = netdev_priv(netdev); + unsigned int phycr; + int data; + int i; + + phycr = ioread32(priv->base + FTGMAC100_OFFSET_PHYCR); + + /* preserve MDC cycle threshold */ + phycr &= FTGMAC100_PHYCR_MDC_CYCTHR_MASK; + + phycr |= FTGMAC100_PHYCR_PHYAD(phy_addr) | + FTGMAC100_PHYCR_REGAD(regnum) | + FTGMAC100_PHYCR_MIIWR; + + data = FTGMAC100_PHYDATA_MIIWDATA(value); + + iowrite32(data, priv->base + FTGMAC100_OFFSET_PHYDATA); + iowrite32(phycr, priv->base + FTGMAC100_OFFSET_PHYCR); + + for (i = 0; i < 10; i++) { + phycr = ioread32(priv->base + FTGMAC100_OFFSET_PHYCR); + + if ((phycr & FTGMAC100_PHYCR_MIIWR) == 0) + return 0; + + udelay(100); + } + + netdev_err(netdev, "mdio write timed out\n"); + return -EIO; +} + +static int ftgmac100_mdiobus_reset(struct mii_bus *bus) +{ + return 0; +} + +/****************************************************************************** + * struct ethtool_ops functions + *****************************************************************************/ +static void ftgmac100_get_drvinfo(struct net_device *netdev, + struct ethtool_drvinfo *info) +{ + strcpy(info->driver, DRV_NAME); + strcpy(info->version, DRV_VERSION); + strcpy(info->bus_info, dev_name(&netdev->dev)); +} + +static int ftgmac100_get_settings(struct net_device *netdev, + struct ethtool_cmd *cmd) +{ + struct ftgmac100 *priv = netdev_priv(netdev); + + return phy_ethtool_gset(priv->phydev, cmd); +} + +static int ftgmac100_set_settings(struct net_device *netdev, + struct ethtool_cmd *cmd) +{ + struct ftgmac100 *priv = netdev_priv(netdev); + + return phy_ethtool_sset(priv->phydev, cmd); +} + +static const struct ethtool_ops ftgmac100_ethtool_ops = { + .set_settings = ftgmac100_set_settings, + .get_settings = ftgmac100_get_settings, + .get_drvinfo = ftgmac100_get_drvinfo, + .get_link = ethtool_op_get_link, +}; + +/****************************************************************************** + * interrupt handler + *****************************************************************************/ +static irqreturn_t ftgmac100_interrupt(int irq, void *dev_id) +{ + struct net_device *netdev = dev_id; + struct ftgmac100 *priv = netdev_priv(netdev); + + if (likely(netif_running(netdev))) { + /* Disable interrupts for polling */ + iowrite32(0, priv->base + FTGMAC100_OFFSET_IER); + napi_schedule(&priv->napi); + } + + return IRQ_HANDLED; +} + +/****************************************************************************** + * struct napi_struct functions + *****************************************************************************/ +static int ftgmac100_poll(struct napi_struct *napi, int budget) +{ + struct ftgmac100 *priv = container_of(napi, struct ftgmac100, napi); + struct net_device *netdev = priv->netdev; + unsigned int status; + bool completed = true; + int rx = 0; + + status = ioread32(priv->base + FTGMAC100_OFFSET_ISR); + iowrite32(status, priv->base + FTGMAC100_OFFSET_ISR); + + if (status & (FTGMAC100_INT_RPKT_BUF | FTGMAC100_INT_NO_RXBUF)) { + /* + * FTGMAC100_INT_RPKT_BUF: + * RX DMA has received packets into RX buffer successfully + * + * FTGMAC100_INT_NO_RXBUF: + * RX buffer unavailable + */ + bool retry; + + do { + retry = ftgmac100_rx_packet(priv, &rx); + } while (retry && rx < budget); + + if (retry && rx == budget) + completed = false; + } + + if (status & (FTGMAC100_INT_XPKT_ETH | FTGMAC100_INT_XPKT_LOST)) { + /* + * FTGMAC100_INT_XPKT_ETH: + * packet transmitted to ethernet successfully + * + * FTGMAC100_INT_XPKT_LOST: + * packet transmitted to ethernet lost due to late + * collision or excessive collision + */ + ftgmac100_tx_complete(priv); + } + + if (status & (FTGMAC100_INT_NO_RXBUF | FTGMAC100_INT_RPKT_LOST | + FTGMAC100_INT_AHB_ERR | FTGMAC100_INT_PHYSTS_CHG)) { + if (net_ratelimit()) + netdev_info(netdev, "[ISR] = 0x%x: %s%s%s%s\n", status, + status & FTGMAC100_INT_NO_RXBUF ? "NO_RXBUF " : "", + status & FTGMAC100_INT_RPKT_LOST ? "RPKT_LOST " : "", + status & FTGMAC100_INT_AHB_ERR ? "AHB_ERR " : "", + status & FTGMAC100_INT_PHYSTS_CHG ? "PHYSTS_CHG" : ""); + + if (status & FTGMAC100_INT_NO_RXBUF) { + /* RX buffer unavailable */ + netdev->stats.rx_over_errors++; + } + + if (status & FTGMAC100_INT_RPKT_LOST) { + /* received packet lost due to RX FIFO full */ + netdev->stats.rx_fifo_errors++; + } + } + + if (completed) { + napi_complete(napi); + + /* enable all interrupts */ + iowrite32(INT_MASK_ALL_ENABLED, priv->base + FTGMAC100_OFFSET_IER); + } + + return rx; +} + +/****************************************************************************** + * struct net_device_ops functions + *****************************************************************************/ +static int ftgmac100_open(struct net_device *netdev) +{ + struct ftgmac100 *priv = netdev_priv(netdev); + int err; + + err = ftgmac100_alloc_buffers(priv); + if (err) { + netdev_err(netdev, "failed to allocate buffers\n"); + goto err_alloc; + } + + err = request_irq(priv->irq, ftgmac100_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 = ftgmac100_reset_hw(priv); + if (err) + goto err_hw; + + ftgmac100_init_hw(priv); + ftgmac100_start_hw(priv, 10); + + phy_start(priv->phydev); + + napi_enable(&priv->napi); + netif_start_queue(netdev); + + /* enable all interrupts */ + iowrite32(INT_MASK_ALL_ENABLED, priv->base + FTGMAC100_OFFSET_IER); + return 0; + +err_hw: + free_irq(priv->irq, netdev); +err_irq: + ftgmac100_free_buffers(priv); +err_alloc: + return err; +} + +static int ftgmac100_stop(struct net_device *netdev) +{ + struct ftgmac100 *priv = netdev_priv(netdev); + + /* disable all interrupts */ + iowrite32(0, priv->base + FTGMAC100_OFFSET_IER); + + netif_stop_queue(netdev); + napi_disable(&priv->napi); + phy_stop(priv->phydev); + + ftgmac100_stop_hw(priv); + free_irq(priv->irq, netdev); + ftgmac100_free_buffers(priv); + + return 0; +} + +static int ftgmac100_hard_start_xmit(struct sk_buff *skb, + struct net_device *netdev) +{ + struct ftgmac100 *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 ftgmac100_xmit(priv, skb, map); +} + +/* optional */ +static int ftgmac100_do_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd) +{ + struct ftgmac100 *priv = netdev_priv(netdev); + + return phy_mii_ioctl(priv->phydev, ifr, cmd); +} + +static const struct net_device_ops ftgmac100_netdev_ops = { + .ndo_open = ftgmac100_open, + .ndo_stop = ftgmac100_stop, + .ndo_start_xmit = ftgmac100_hard_start_xmit, + .ndo_set_mac_address = eth_mac_addr, + .ndo_validate_addr = eth_validate_addr, + .ndo_do_ioctl = ftgmac100_do_ioctl, +}; + +/****************************************************************************** + * struct platform_driver functions + *****************************************************************************/ +static int ftgmac100_probe(struct platform_device *pdev) +{ + struct resource *res; + int irq; + struct net_device *netdev; + struct ftgmac100 *priv; + int err; + int i; + + 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); + + SET_ETHTOOL_OPS(netdev, &ftgmac100_ethtool_ops); + netdev->netdev_ops = &ftgmac100_netdev_ops; + netdev->features = NETIF_F_IP_CSUM | NETIF_F_GRO; + + 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, ftgmac100_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 mdio bus */ + priv->mii_bus = mdiobus_alloc(); + if (!priv->mii_bus) { + err = -EIO; + goto err_alloc_mdiobus; + } + + priv->mii_bus->name = "ftgmac100_mdio"; + snprintf(priv->mii_bus->id, MII_BUS_ID_SIZE, "ftgmac100_mii"); + + priv->mii_bus->priv = netdev; + priv->mii_bus->read = ftgmac100_mdiobus_read; + priv->mii_bus->write = ftgmac100_mdiobus_write; + priv->mii_bus->reset = ftgmac100_mdiobus_reset; + priv->mii_bus->irq = priv->phy_irq; + + for (i = 0; i < PHY_MAX_ADDR; i++) + priv->mii_bus->irq[i] = PHY_POLL; + + err = mdiobus_register(priv->mii_bus); + if (err) { + dev_err(&pdev->dev, "Cannot register MDIO bus!\n"); + goto err_register_mdiobus; + } + + err = ftgmac100_mii_probe(priv); + if (err) { + dev_err(&pdev->dev, "MII Probe failed!\n"); + goto err_mii_probe; + } + + /* 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)) { + random_ether_addr(netdev->dev_addr); + netdev_info(netdev, "generated random MAC address %pM\n", + netdev->dev_addr); + } + + return 0; + +err_register_netdev: + phy_disconnect(priv->phydev); +err_mii_probe: + mdiobus_unregister(priv->mii_bus); +err_register_mdiobus: + mdiobus_free(priv->mii_bus); +err_alloc_mdiobus: + iounmap(priv->base); +err_ioremap: + release_resource(priv->res); +err_req_mem: + netif_napi_del(&priv->napi); + platform_set_drvdata(pdev, NULL); + free_netdev(netdev); +err_alloc_etherdev: + return err; +} + +static int __exit ftgmac100_remove(struct platform_device *pdev) +{ + struct net_device *netdev; + struct ftgmac100 *priv; + + netdev = platform_get_drvdata(pdev); + priv = netdev_priv(netdev); + + unregister_netdev(netdev); + + phy_disconnect(priv->phydev); + mdiobus_unregister(priv->mii_bus); + mdiobus_free(priv->mii_bus); + + iounmap(priv->base); + release_resource(priv->res); + + netif_napi_del(&priv->napi); + platform_set_drvdata(pdev, NULL); + free_netdev(netdev); + return 0; +} + +static struct platform_driver ftgmac100_driver = { + .probe = ftgmac100_probe, + .remove = __exit_p(ftgmac100_remove), + .driver = { + .name = DRV_NAME, + .owner = THIS_MODULE, + }, +}; + +/****************************************************************************** + * initialization / finalization + *****************************************************************************/ +static int __init ftgmac100_init(void) +{ + pr_info("Loading version " DRV_VERSION " ...\n"); + return platform_driver_register(&ftgmac100_driver); +} + +static void __exit ftgmac100_exit(void) +{ + platform_driver_unregister(&ftgmac100_driver); +} + +module_init(ftgmac100_init); +module_exit(ftgmac100_exit); + +MODULE_AUTHOR("Po-Yu Chuang <ratbert@faraday-tech.com>"); +MODULE_DESCRIPTION("FTGMAC100 driver"); +MODULE_LICENSE("GPL"); |