diff options
Diffstat (limited to 'drivers/net/ftmac100.c')
| -rw-r--r-- | drivers/net/ftmac100.c | 1198 |
1 files changed, 0 insertions, 1198 deletions
diff --git a/drivers/net/ftmac100.c b/drivers/net/ftmac100.c deleted file mode 100644 index 9bd7746cbfc..00000000000 --- a/drivers/net/ftmac100.c +++ /dev/null @@ -1,1198 +0,0 @@ -/* - * Faraday FTMAC100 10/100 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/mii.h> -#include <linux/module.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; - - 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. - */ - if (unlikely(!ftmac100_rxdes_last_segment(rxdes))) - BUG(); - - /* 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; - skb->truesize += length; - __pskb_pull_tail(skb, min(length, 64)); - - 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 int 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; - - memset(priv->descs, 0, sizeof(struct ftmac100_descs)); - - /* 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) -{ - strcpy(info->driver, DRV_NAME); - strcpy(info->version, DRV_VERSION); - strcpy(info->bus_info, dev_name(&netdev->dev)); -} - -static int ftmac100_get_settings(struct net_device *netdev, struct ethtool_cmd *cmd) -{ - struct ftmac100 *priv = netdev_priv(netdev); - return mii_ethtool_gset(&priv->mii, cmd); -} - -static int ftmac100_set_settings(struct net_device *netdev, struct ethtool_cmd *cmd) -{ - struct ftmac100 *priv = netdev_priv(netdev); - return mii_ethtool_sset(&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 = { - .set_settings = ftmac100_set_settings, - .get_settings = ftmac100_get_settings, - .get_drvinfo = ftmac100_get_drvinfo, - .nway_reset = ftmac100_nway_reset, - .get_link = ftmac100_get_link, -}; - -/****************************************************************************** - * interrupt handler - *****************************************************************************/ -static irqreturn_t ftmac100_interrupt(int irq, void *dev_id) -{ - struct net_device *netdev = dev_id; - struct ftmac100 *priv = netdev_priv(netdev); - - if (likely(netif_running(netdev))) { - /* Disable interrupts for polling */ - ftmac100_disable_all_int(priv); - 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 int 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); - SET_ETHTOOL_OPS(netdev, &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)) { - random_ether_addr(netdev->dev_addr); - 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); - platform_set_drvdata(pdev, NULL); - free_netdev(netdev); -err_alloc_etherdev: - return err; -} - -static int __exit 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); - platform_set_drvdata(pdev, NULL); - free_netdev(netdev); - return 0; -} - -static struct platform_driver ftmac100_driver = { - .probe = ftmac100_probe, - .remove = __exit_p(ftmac100_remove), - .driver = { - .name = DRV_NAME, - .owner = THIS_MODULE, - }, -}; - -/****************************************************************************** - * 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"); |