| // 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/if_ether.h> |
| #include <linux/if_vlan.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 RX_QUEUE_ENTRIES 128 /* must be power of 2 */ |
| #define TX_QUEUE_ENTRIES 16 /* must be power of 2 */ |
| |
| #define RX_BUF_SIZE 2044 /* must be smaller than 0x7ff */ |
| #define MAX_PKT_SIZE RX_BUF_SIZE /* multi-segment not supported */ |
| |
| #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; |
| unsigned int maccr = MACCR_ENABLE_ALL; |
| |
| 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); |
| |
| /* See ftmac100_change_mtu() */ |
| if (netdev->mtu > ETH_DATA_LEN) |
| maccr |= FTMAC100_MACCR_RX_FTL; |
| |
| iowrite32(maccr, 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_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_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; |
| } |
| /* |
| * FTMAC100_RXDES0_FTL is not an error, it just indicates that the |
| * frame is longer than 1518 octets. Receiving these is possible when |
| * we told the hardware not to drop them, via FTMAC100_MACCR_RX_FTL. |
| */ |
| |
| 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; |
| } |
| |
| /* We don't support multi-segment packets for now, so drop them. */ |
| ret = ftmac100_rxdes_last_segment(rxdes); |
| if (unlikely(!ret)) { |
| netdev->stats.rx_length_errors++; |
| ftmac100_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"); |
| |
| 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) |
| { |
| strscpy(info->driver, DRV_NAME, sizeof(info->driver)); |
| strscpy(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 int ftmac100_change_mtu(struct net_device *netdev, int mtu) |
| { |
| struct ftmac100 *priv = netdev_priv(netdev); |
| unsigned int maccr; |
| |
| maccr = ioread32(priv->base + FTMAC100_OFFSET_MACCR); |
| if (mtu > ETH_DATA_LEN) { |
| /* process long packets in the driver */ |
| maccr |= FTMAC100_MACCR_RX_FTL; |
| } else { |
| /* Let the controller drop incoming packets greater |
| * than 1518 (that is 1500 + 14 Ethernet + 4 FCS). |
| */ |
| maccr &= ~FTMAC100_MACCR_RX_FTL; |
| } |
| iowrite32(maccr, priv->base + FTMAC100_OFFSET_MACCR); |
| |
| netdev->mtu = mtu; |
| |
| return 0; |
| } |
| |
| 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_eth_ioctl = ftmac100_do_ioctl, |
| .ndo_change_mtu = ftmac100_change_mtu, |
| }; |
| |
| /****************************************************************************** |
| * 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; |
| |
| 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; |
| netdev->max_mtu = MAX_PKT_SIZE - VLAN_ETH_HLEN; |
| |
| err = platform_get_ethdev_address(&pdev->dev, netdev); |
| if (err == -EPROBE_DEFER) |
| goto defer_get_mac; |
| |
| 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); |
| |
| /* 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); |
| defer_get_mac: |
| 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 |
| *****************************************************************************/ |
| module_platform_driver(ftmac100_driver); |
| |
| MODULE_AUTHOR("Po-Yu Chuang <ratbert@faraday-tech.com>"); |
| MODULE_DESCRIPTION("FTMAC100 driver"); |
| MODULE_LICENSE("GPL"); |
| MODULE_DEVICE_TABLE(of, ftmac100_of_ids); |