diff options
Diffstat (limited to 'drivers/net/ethernet/engleder/tsnep_main.c')
| -rw-r--r-- | drivers/net/ethernet/engleder/tsnep_main.c | 1272 |
1 files changed, 1272 insertions, 0 deletions
diff --git a/drivers/net/ethernet/engleder/tsnep_main.c b/drivers/net/ethernet/engleder/tsnep_main.c new file mode 100644 index 000000000000..904f3304727e --- /dev/null +++ b/drivers/net/ethernet/engleder/tsnep_main.c @@ -0,0 +1,1272 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (C) 2021 Gerhard Engleder <gerhard@engleder-embedded.com> */ + +/* TSN endpoint Ethernet MAC driver + * + * The TSN endpoint Ethernet MAC is a FPGA based network device for real-time + * communication. It is designed for endpoints within TSN (Time Sensitive + * Networking) networks; e.g., for PLCs in the industrial automation case. + * + * It supports multiple TX/RX queue pairs. The first TX/RX queue pair is used + * by the driver. + * + * More information can be found here: + * - www.embedded-experts.at/tsn + * - www.engleder-embedded.com + */ + +#include "tsnep.h" +#include "tsnep_hw.h" + +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_net.h> +#include <linux/of_mdio.h> +#include <linux/interrupt.h> +#include <linux/etherdevice.h> +#include <linux/phy.h> +#include <linux/iopoll.h> + +#define RX_SKB_LENGTH (round_up(TSNEP_RX_INLINE_METADATA_SIZE + ETH_HLEN + \ + TSNEP_MAX_FRAME_SIZE + ETH_FCS_LEN, 4)) +#define RX_SKB_RESERVE ((16 - TSNEP_RX_INLINE_METADATA_SIZE) + NET_IP_ALIGN) +#define RX_SKB_ALLOC_LENGTH (RX_SKB_RESERVE + RX_SKB_LENGTH) + +#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT +#define DMA_ADDR_HIGH(dma_addr) ((u32)(((dma_addr) >> 32) & 0xFFFFFFFF)) +#else +#define DMA_ADDR_HIGH(dma_addr) ((u32)(0)) +#endif +#define DMA_ADDR_LOW(dma_addr) ((u32)((dma_addr) & 0xFFFFFFFF)) + +static void tsnep_enable_irq(struct tsnep_adapter *adapter, u32 mask) +{ + iowrite32(mask, adapter->addr + ECM_INT_ENABLE); +} + +static void tsnep_disable_irq(struct tsnep_adapter *adapter, u32 mask) +{ + mask |= ECM_INT_DISABLE; + iowrite32(mask, adapter->addr + ECM_INT_ENABLE); +} + +static irqreturn_t tsnep_irq(int irq, void *arg) +{ + struct tsnep_adapter *adapter = arg; + u32 active = ioread32(adapter->addr + ECM_INT_ACTIVE); + + /* acknowledge interrupt */ + if (active != 0) + iowrite32(active, adapter->addr + ECM_INT_ACKNOWLEDGE); + + /* handle link interrupt */ + if ((active & ECM_INT_LINK) != 0) { + if (adapter->netdev->phydev) + phy_mac_interrupt(adapter->netdev->phydev); + } + + /* handle TX/RX queue 0 interrupt */ + if ((active & adapter->queue[0].irq_mask) != 0) { + if (adapter->netdev) { + tsnep_disable_irq(adapter, adapter->queue[0].irq_mask); + napi_schedule(&adapter->queue[0].napi); + } + } + + return IRQ_HANDLED; +} + +static int tsnep_mdiobus_read(struct mii_bus *bus, int addr, int regnum) +{ + struct tsnep_adapter *adapter = bus->priv; + u32 md; + int retval; + + if (regnum & MII_ADDR_C45) + return -EOPNOTSUPP; + + md = ECM_MD_READ; + if (!adapter->suppress_preamble) + md |= ECM_MD_PREAMBLE; + md |= (regnum << ECM_MD_ADDR_SHIFT) & ECM_MD_ADDR_MASK; + md |= (addr << ECM_MD_PHY_ADDR_SHIFT) & ECM_MD_PHY_ADDR_MASK; + iowrite32(md, adapter->addr + ECM_MD_CONTROL); + retval = readl_poll_timeout_atomic(adapter->addr + ECM_MD_STATUS, md, + !(md & ECM_MD_BUSY), 16, 1000); + if (retval != 0) + return retval; + + return (md & ECM_MD_DATA_MASK) >> ECM_MD_DATA_SHIFT; +} + +static int tsnep_mdiobus_write(struct mii_bus *bus, int addr, int regnum, + u16 val) +{ + struct tsnep_adapter *adapter = bus->priv; + u32 md; + int retval; + + if (regnum & MII_ADDR_C45) + return -EOPNOTSUPP; + + md = ECM_MD_WRITE; + if (!adapter->suppress_preamble) + md |= ECM_MD_PREAMBLE; + md |= (regnum << ECM_MD_ADDR_SHIFT) & ECM_MD_ADDR_MASK; + md |= (addr << ECM_MD_PHY_ADDR_SHIFT) & ECM_MD_PHY_ADDR_MASK; + md |= ((u32)val << ECM_MD_DATA_SHIFT) & ECM_MD_DATA_MASK; + iowrite32(md, adapter->addr + ECM_MD_CONTROL); + retval = readl_poll_timeout_atomic(adapter->addr + ECM_MD_STATUS, md, + !(md & ECM_MD_BUSY), 16, 1000); + if (retval != 0) + return retval; + + return 0; +} + +static void tsnep_phy_link_status_change(struct net_device *netdev) +{ + struct tsnep_adapter *adapter = netdev_priv(netdev); + struct phy_device *phydev = netdev->phydev; + u32 mode; + + if (phydev->link) { + switch (phydev->speed) { + case SPEED_100: + mode = ECM_LINK_MODE_100; + break; + case SPEED_1000: + mode = ECM_LINK_MODE_1000; + break; + default: + mode = ECM_LINK_MODE_OFF; + break; + } + iowrite32(mode, adapter->addr + ECM_STATUS); + } + + phy_print_status(netdev->phydev); +} + +static int tsnep_phy_open(struct tsnep_adapter *adapter) +{ + struct phy_device *phydev; + struct ethtool_eee ethtool_eee; + int retval; + + retval = phy_connect_direct(adapter->netdev, adapter->phydev, + tsnep_phy_link_status_change, + adapter->phy_mode); + if (retval) + return retval; + phydev = adapter->netdev->phydev; + + /* MAC supports only 100Mbps|1000Mbps full duplex + * SPE (Single Pair Ethernet) is also an option but not implemented yet + */ + phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_10baseT_Half_BIT); + phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_10baseT_Full_BIT); + phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_100baseT_Half_BIT); + phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_1000baseT_Half_BIT); + + /* disable EEE autoneg, EEE not supported by TSNEP */ + memset(ðtool_eee, 0, sizeof(ethtool_eee)); + phy_ethtool_set_eee(adapter->phydev, ðtool_eee); + + adapter->phydev->irq = PHY_MAC_INTERRUPT; + phy_start(adapter->phydev); + + return 0; +} + +static void tsnep_phy_close(struct tsnep_adapter *adapter) +{ + phy_stop(adapter->netdev->phydev); + phy_disconnect(adapter->netdev->phydev); + adapter->netdev->phydev = NULL; +} + +static void tsnep_tx_ring_cleanup(struct tsnep_tx *tx) +{ + struct device *dmadev = tx->adapter->dmadev; + int i; + + memset(tx->entry, 0, sizeof(tx->entry)); + + for (i = 0; i < TSNEP_RING_PAGE_COUNT; i++) { + if (tx->page[i]) { + dma_free_coherent(dmadev, PAGE_SIZE, tx->page[i], + tx->page_dma[i]); + tx->page[i] = NULL; + tx->page_dma[i] = 0; + } + } +} + +static int tsnep_tx_ring_init(struct tsnep_tx *tx) +{ + struct device *dmadev = tx->adapter->dmadev; + struct tsnep_tx_entry *entry; + struct tsnep_tx_entry *next_entry; + int i, j; + int retval; + + for (i = 0; i < TSNEP_RING_PAGE_COUNT; i++) { + tx->page[i] = + dma_alloc_coherent(dmadev, PAGE_SIZE, &tx->page_dma[i], + GFP_KERNEL); + if (!tx->page[i]) { + retval = -ENOMEM; + goto alloc_failed; + } + for (j = 0; j < TSNEP_RING_ENTRIES_PER_PAGE; j++) { + entry = &tx->entry[TSNEP_RING_ENTRIES_PER_PAGE * i + j]; + entry->desc_wb = (struct tsnep_tx_desc_wb *) + (((u8 *)tx->page[i]) + TSNEP_DESC_SIZE * j); + entry->desc = (struct tsnep_tx_desc *) + (((u8 *)entry->desc_wb) + TSNEP_DESC_OFFSET); + entry->desc_dma = tx->page_dma[i] + TSNEP_DESC_SIZE * j; + } + } + for (i = 0; i < TSNEP_RING_SIZE; i++) { + entry = &tx->entry[i]; + next_entry = &tx->entry[(i + 1) % TSNEP_RING_SIZE]; + entry->desc->next = __cpu_to_le64(next_entry->desc_dma); + } + + return 0; + +alloc_failed: + tsnep_tx_ring_cleanup(tx); + return retval; +} + +static void tsnep_tx_activate(struct tsnep_tx *tx, int index, bool last) +{ + struct tsnep_tx_entry *entry = &tx->entry[index]; + + entry->properties = 0; + if (entry->skb) { + entry->properties = + skb_pagelen(entry->skb) & TSNEP_DESC_LENGTH_MASK; + entry->properties |= TSNEP_DESC_INTERRUPT_FLAG; + if (skb_shinfo(entry->skb)->tx_flags & SKBTX_IN_PROGRESS) + entry->properties |= TSNEP_DESC_EXTENDED_WRITEBACK_FLAG; + + /* toggle user flag to prevent false acknowledge + * + * Only the first fragment is acknowledged. For all other + * fragments no acknowledge is done and the last written owner + * counter stays in the writeback descriptor. Therefore, it is + * possible that the last written owner counter is identical to + * the new incremented owner counter and a false acknowledge is + * detected before the real acknowledge has been done by + * hardware. + * + * The user flag is used to prevent this situation. The user + * flag is copied to the writeback descriptor by the hardware + * and is used as additional acknowledge data. By toggeling the + * user flag only for the first fragment (which is + * acknowledged), it is guaranteed that the last acknowledge + * done for this descriptor has used a different user flag and + * cannot be detected as false acknowledge. + */ + entry->owner_user_flag = !entry->owner_user_flag; + } + if (last) + entry->properties |= TSNEP_TX_DESC_LAST_FRAGMENT_FLAG; + if (index == tx->increment_owner_counter) { + tx->owner_counter++; + if (tx->owner_counter == 4) + tx->owner_counter = 1; + tx->increment_owner_counter--; + if (tx->increment_owner_counter < 0) + tx->increment_owner_counter = TSNEP_RING_SIZE - 1; + } + entry->properties |= + (tx->owner_counter << TSNEP_DESC_OWNER_COUNTER_SHIFT) & + TSNEP_DESC_OWNER_COUNTER_MASK; + if (entry->owner_user_flag) + entry->properties |= TSNEP_TX_DESC_OWNER_USER_FLAG; + entry->desc->more_properties = + __cpu_to_le32(entry->len & TSNEP_DESC_LENGTH_MASK); + + /* descriptor properties shall be written last, because valid data is + * signaled there + */ + dma_wmb(); + + entry->desc->properties = __cpu_to_le32(entry->properties); +} + +static int tsnep_tx_desc_available(struct tsnep_tx *tx) +{ + if (tx->read <= tx->write) + return TSNEP_RING_SIZE - tx->write + tx->read - 1; + else + return tx->read - tx->write - 1; +} + +static int tsnep_tx_map(struct sk_buff *skb, struct tsnep_tx *tx, int count) +{ + struct device *dmadev = tx->adapter->dmadev; + struct tsnep_tx_entry *entry; + unsigned int len; + dma_addr_t dma; + int i; + + for (i = 0; i < count; i++) { + entry = &tx->entry[(tx->write + i) % TSNEP_RING_SIZE]; + + if (i == 0) { + len = skb_headlen(skb); + dma = dma_map_single(dmadev, skb->data, len, + DMA_TO_DEVICE); + } else { + len = skb_frag_size(&skb_shinfo(skb)->frags[i - 1]); + dma = skb_frag_dma_map(dmadev, + &skb_shinfo(skb)->frags[i - 1], + 0, len, DMA_TO_DEVICE); + } + if (dma_mapping_error(dmadev, dma)) + return -ENOMEM; + + entry->len = len; + dma_unmap_addr_set(entry, dma, dma); + + entry->desc->tx = __cpu_to_le64(dma); + } + + return 0; +} + +static void tsnep_tx_unmap(struct tsnep_tx *tx, int count) +{ + struct device *dmadev = tx->adapter->dmadev; + struct tsnep_tx_entry *entry; + int i; + + for (i = 0; i < count; i++) { + entry = &tx->entry[(tx->read + i) % TSNEP_RING_SIZE]; + + if (entry->len) { + if (i == 0) + dma_unmap_single(dmadev, + dma_unmap_addr(entry, dma), + dma_unmap_len(entry, len), + DMA_TO_DEVICE); + else + dma_unmap_page(dmadev, + dma_unmap_addr(entry, dma), + dma_unmap_len(entry, len), + DMA_TO_DEVICE); + entry->len = 0; + } + } +} + +static netdev_tx_t tsnep_xmit_frame_ring(struct sk_buff *skb, + struct tsnep_tx *tx) +{ + unsigned long flags; + int count = 1; + struct tsnep_tx_entry *entry; + int i; + int retval; + + if (skb_shinfo(skb)->nr_frags > 0) + count += skb_shinfo(skb)->nr_frags; + + spin_lock_irqsave(&tx->lock, flags); + + if (tsnep_tx_desc_available(tx) < count) { + /* ring full, shall not happen because queue is stopped if full + * below + */ + netif_stop_queue(tx->adapter->netdev); + + spin_unlock_irqrestore(&tx->lock, flags); + + return NETDEV_TX_BUSY; + } + + entry = &tx->entry[tx->write]; + entry->skb = skb; + + retval = tsnep_tx_map(skb, tx, count); + if (retval != 0) { + tsnep_tx_unmap(tx, count); + dev_kfree_skb_any(entry->skb); + entry->skb = NULL; + + tx->dropped++; + + spin_unlock_irqrestore(&tx->lock, flags); + + netdev_err(tx->adapter->netdev, "TX DMA map failed\n"); + + return NETDEV_TX_OK; + } + + if (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) + skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS; + + for (i = 0; i < count; i++) + tsnep_tx_activate(tx, (tx->write + i) % TSNEP_RING_SIZE, + i == (count - 1)); + tx->write = (tx->write + count) % TSNEP_RING_SIZE; + + skb_tx_timestamp(skb); + + /* descriptor properties shall be valid before hardware is notified */ + dma_wmb(); + + iowrite32(TSNEP_CONTROL_TX_ENABLE, tx->addr + TSNEP_CONTROL); + + if (tsnep_tx_desc_available(tx) < (MAX_SKB_FRAGS + 1)) { + /* ring can get full with next frame */ + netif_stop_queue(tx->adapter->netdev); + } + + tx->packets++; + tx->bytes += skb_pagelen(entry->skb) + ETH_FCS_LEN; + + spin_unlock_irqrestore(&tx->lock, flags); + + return NETDEV_TX_OK; +} + +static bool tsnep_tx_poll(struct tsnep_tx *tx, int napi_budget) +{ + unsigned long flags; + int budget = 128; + struct tsnep_tx_entry *entry; + int count; + + spin_lock_irqsave(&tx->lock, flags); + + do { + if (tx->read == tx->write) + break; + + entry = &tx->entry[tx->read]; + if ((__le32_to_cpu(entry->desc_wb->properties) & + TSNEP_TX_DESC_OWNER_MASK) != + (entry->properties & TSNEP_TX_DESC_OWNER_MASK)) + break; + + /* descriptor properties shall be read first, because valid data + * is signaled there + */ + dma_rmb(); + + count = 1; + if (skb_shinfo(entry->skb)->nr_frags > 0) + count += skb_shinfo(entry->skb)->nr_frags; + + tsnep_tx_unmap(tx, count); + + if ((skb_shinfo(entry->skb)->tx_flags & SKBTX_IN_PROGRESS) && + (__le32_to_cpu(entry->desc_wb->properties) & + TSNEP_DESC_EXTENDED_WRITEBACK_FLAG)) { + struct skb_shared_hwtstamps hwtstamps; + u64 timestamp = + __le64_to_cpu(entry->desc_wb->timestamp); + + memset(&hwtstamps, 0, sizeof(hwtstamps)); + hwtstamps.hwtstamp = ns_to_ktime(timestamp); + + skb_tstamp_tx(entry->skb, &hwtstamps); + } + + napi_consume_skb(entry->skb, budget); + entry->skb = NULL; + + tx->read = (tx->read + count) % TSNEP_RING_SIZE; + + budget--; + } while (likely(budget)); + + if ((tsnep_tx_desc_available(tx) >= ((MAX_SKB_FRAGS + 1) * 2)) && + netif_queue_stopped(tx->adapter->netdev)) { + netif_wake_queue(tx->adapter->netdev); + } + + spin_unlock_irqrestore(&tx->lock, flags); + + return (budget != 0); +} + +static int tsnep_tx_open(struct tsnep_adapter *adapter, void __iomem *addr, + struct tsnep_tx *tx) +{ + dma_addr_t dma; + int retval; + + memset(tx, 0, sizeof(*tx)); + tx->adapter = adapter; + tx->addr = addr; + + retval = tsnep_tx_ring_init(tx); + if (retval) + return retval; + + dma = tx->entry[0].desc_dma | TSNEP_RESET_OWNER_COUNTER; + iowrite32(DMA_ADDR_LOW(dma), tx->addr + TSNEP_TX_DESC_ADDR_LOW); + iowrite32(DMA_ADDR_HIGH(dma), tx->addr + TSNEP_TX_DESC_ADDR_HIGH); + tx->owner_counter = 1; + tx->increment_owner_counter = TSNEP_RING_SIZE - 1; + + spin_lock_init(&tx->lock); + + return 0; +} + +static void tsnep_tx_close(struct tsnep_tx *tx) +{ + u32 val; + + readx_poll_timeout(ioread32, tx->addr + TSNEP_CONTROL, val, + ((val & TSNEP_CONTROL_TX_ENABLE) == 0), 10000, + 1000000); + + tsnep_tx_ring_cleanup(tx); +} + +static void tsnep_rx_ring_cleanup(struct tsnep_rx *rx) +{ + struct device *dmadev = rx->adapter->dmadev; + struct tsnep_rx_entry *entry; + int i; + + for (i = 0; i < TSNEP_RING_SIZE; i++) { + entry = &rx->entry[i]; + if (dma_unmap_addr(entry, dma)) + dma_unmap_single(dmadev, dma_unmap_addr(entry, dma), + dma_unmap_len(entry, len), + DMA_FROM_DEVICE); + if (entry->skb) + dev_kfree_skb(entry->skb); + } + + memset(rx->entry, 0, sizeof(rx->entry)); + + for (i = 0; i < TSNEP_RING_PAGE_COUNT; i++) { + if (rx->page[i]) { + dma_free_coherent(dmadev, PAGE_SIZE, rx->page[i], + rx->page_dma[i]); + rx->page[i] = NULL; + rx->page_dma[i] = 0; + } + } +} + +static int tsnep_rx_alloc_and_map_skb(struct tsnep_rx *rx, + struct tsnep_rx_entry *entry) +{ + struct device *dmadev = rx->adapter->dmadev; + struct sk_buff *skb; + dma_addr_t dma; + + skb = __netdev_alloc_skb(rx->adapter->netdev, RX_SKB_ALLOC_LENGTH, + GFP_ATOMIC | GFP_DMA); + if (!skb) + return -ENOMEM; + + skb_reserve(skb, RX_SKB_RESERVE); + + dma = dma_map_single(dmadev, skb->data, RX_SKB_LENGTH, + DMA_FROM_DEVICE); + if (dma_mapping_error(dmadev, dma)) { + dev_kfree_skb(skb); + return -ENOMEM; + } + + entry->skb = skb; + entry->len = RX_SKB_LENGTH; + dma_unmap_addr_set(entry, dma, dma); + entry->desc->rx = __cpu_to_le64(dma); + + return 0; +} + +static int tsnep_rx_ring_init(struct tsnep_rx *rx) +{ + struct device *dmadev = rx->adapter->dmadev; + struct tsnep_rx_entry *entry; + struct tsnep_rx_entry *next_entry; + int i, j; + int retval; + + for (i = 0; i < TSNEP_RING_PAGE_COUNT; i++) { + rx->page[i] = + dma_alloc_coherent(dmadev, PAGE_SIZE, &rx->page_dma[i], + GFP_KERNEL); + if (!rx->page[i]) { + retval = -ENOMEM; + goto failed; + } + for (j = 0; j < TSNEP_RING_ENTRIES_PER_PAGE; j++) { + entry = &rx->entry[TSNEP_RING_ENTRIES_PER_PAGE * i + j]; + entry->desc_wb = (struct tsnep_rx_desc_wb *) + (((u8 *)rx->page[i]) + TSNEP_DESC_SIZE * j); + entry->desc = (struct tsnep_rx_desc *) + (((u8 *)entry->desc_wb) + TSNEP_DESC_OFFSET); + entry->desc_dma = rx->page_dma[i] + TSNEP_DESC_SIZE * j; + } + } + for (i = 0; i < TSNEP_RING_SIZE; i++) { + entry = &rx->entry[i]; + next_entry = &rx->entry[(i + 1) % TSNEP_RING_SIZE]; + entry->desc->next = __cpu_to_le64(next_entry->desc_dma); + + retval = tsnep_rx_alloc_and_map_skb(rx, entry); + if (retval) + goto failed; + } + + return 0; + +failed: + tsnep_rx_ring_cleanup(rx); + return retval; +} + +static void tsnep_rx_activate(struct tsnep_rx *rx, int index) +{ + struct tsnep_rx_entry *entry = &rx->entry[index]; + + /* RX_SKB_LENGTH is a multiple of 4 */ + entry->properties = entry->len & TSNEP_DESC_LENGTH_MASK; + entry->properties |= TSNEP_DESC_INTERRUPT_FLAG; + if (index == rx->increment_owner_counter) { + rx->owner_counter++; + if (rx->owner_counter == 4) + rx->owner_counter = 1; + rx->increment_owner_counter--; + if (rx->increment_owner_counter < 0) + rx->increment_owner_counter = TSNEP_RING_SIZE - 1; + } + entry->properties |= + (rx->owner_counter << TSNEP_DESC_OWNER_COUNTER_SHIFT) & + TSNEP_DESC_OWNER_COUNTER_MASK; + + /* descriptor properties shall be written last, because valid data is + * signaled there + */ + dma_wmb(); + + entry->desc->properties = __cpu_to_le32(entry->properties); +} + +static int tsnep_rx_poll(struct tsnep_rx *rx, struct napi_struct *napi, + int budget) +{ + struct device *dmadev = rx->adapter->dmadev; + int done = 0; + struct tsnep_rx_entry *entry; + struct sk_buff *skb; + size_t len; + dma_addr_t dma; + int length; + bool enable = false; + int retval; + + while (likely(done < budget)) { + entry = &rx->entry[rx->read]; + if ((__le32_to_cpu(entry->desc_wb->properties) & + TSNEP_DESC_OWNER_COUNTER_MASK) != + (entry->properties & TSNEP_DESC_OWNER_COUNTER_MASK)) + break; + + /* descriptor properties shall be read first, because valid data + * is signaled there + */ + dma_rmb(); + + skb = entry->skb; + len = dma_unmap_len(entry, len); + dma = dma_unmap_addr(entry, dma); + + /* forward skb only if allocation is successful, otherwise + * skb is reused and frame dropped + */ + retval = tsnep_rx_alloc_and_map_skb(rx, entry); + if (!retval) { + dma_unmap_single(dmadev, dma, len, DMA_FROM_DEVICE); + + length = __le32_to_cpu(entry->desc_wb->properties) & + TSNEP_DESC_LENGTH_MASK; + skb_put(skb, length - ETH_FCS_LEN); + if (rx->adapter->hwtstamp_config.rx_filter == + HWTSTAMP_FILTER_ALL) { + struct skb_shared_hwtstamps *hwtstamps = + skb_hwtstamps(skb); + struct tsnep_rx_inline *rx_inline = + (struct tsnep_rx_inline *)skb->data; + u64 timestamp = + __le64_to_cpu(rx_inline->timestamp); + + memset(hwtstamps, 0, sizeof(*hwtstamps)); + hwtstamps->hwtstamp = ns_to_ktime(timestamp); + } + skb_pull(skb, TSNEP_RX_INLINE_METADATA_SIZE); + skb->protocol = eth_type_trans(skb, + rx->adapter->netdev); + + rx->packets++; + rx->bytes += length - TSNEP_RX_INLINE_METADATA_SIZE; + if (skb->pkt_type == PACKET_MULTICAST) + rx->multicast++; + + napi_gro_receive(napi, skb); + done++; + } else { + rx->dropped++; + } + + tsnep_rx_activate(rx, rx->read); + + enable = true; + + rx->read = (rx->read + 1) % TSNEP_RING_SIZE; + } + + if (enable) { + /* descriptor properties shall be valid before hardware is + * notified + */ + dma_wmb(); + + iowrite32(TSNEP_CONTROL_RX_ENABLE, rx->addr + TSNEP_CONTROL); + } + + return done; +} + +static int tsnep_rx_open(struct tsnep_adapter *adapter, void __iomem *addr, + struct tsnep_rx *rx) +{ + dma_addr_t dma; + int i; + int retval; + + memset(rx, 0, sizeof(*rx)); + rx->adapter = adapter; + rx->addr = addr; + + retval = tsnep_rx_ring_init(rx); + if (retval) + return retval; + + dma = rx->entry[0].desc_dma | TSNEP_RESET_OWNER_COUNTER; + iowrite32(DMA_ADDR_LOW(dma), rx->addr + TSNEP_RX_DESC_ADDR_LOW); + iowrite32(DMA_ADDR_HIGH(dma), rx->addr + TSNEP_RX_DESC_ADDR_HIGH); + rx->owner_counter = 1; + rx->increment_owner_counter = TSNEP_RING_SIZE - 1; + + for (i = 0; i < TSNEP_RING_SIZE; i++) + tsnep_rx_activate(rx, i); + + /* descriptor properties shall be valid before hardware is notified */ + dma_wmb(); + + iowrite32(TSNEP_CONTROL_RX_ENABLE, rx->addr + TSNEP_CONTROL); + + return 0; +} + +static void tsnep_rx_close(struct tsnep_rx *rx) +{ + u32 val; + + iowrite32(TSNEP_CONTROL_RX_DISABLE, rx->addr + TSNEP_CONTROL); + readx_poll_timeout(ioread32, rx->addr + TSNEP_CONTROL, val, + ((val & TSNEP_CONTROL_RX_ENABLE) == 0), 10000, + 1000000); + + tsnep_rx_ring_cleanup(rx); +} + +static int tsnep_poll(struct napi_struct *napi, int budget) +{ + struct tsnep_queue *queue = container_of(napi, struct tsnep_queue, + napi); + bool complete = true; + int done = 0; + + if (queue->tx) + complete = tsnep_tx_poll(queue->tx, budget); + + if (queue->rx) { + done = tsnep_rx_poll(queue->rx, napi, budget); + if (done >= budget) + complete = false; + } + + /* if all work not completed, return budget and keep polling */ + if (!complete) + return budget; + + if (likely(napi_complete_done(napi, done))) + tsnep_enable_irq(queue->adapter, queue->irq_mask); + + return min(done, budget - 1); +} + +static int tsnep_netdev_open(struct net_device *netdev) +{ + struct tsnep_adapter *adapter = netdev_priv(netdev); + int i; + void __iomem *addr; + int tx_queue_index = 0; + int rx_queue_index = 0; + int retval; + + retval = tsnep_phy_open(adapter); + if (retval) + return retval; + + for (i = 0; i < adapter->num_queues; i++) { + adapter->queue[i].adapter = adapter; + if (adapter->queue[i].tx) { + addr = adapter->addr + TSNEP_QUEUE(tx_queue_index); + retval = tsnep_tx_open(adapter, addr, + adapter->queue[i].tx); + if (retval) + goto failed; + tx_queue_index++; + } + if (adapter->queue[i].rx) { + addr = adapter->addr + TSNEP_QUEUE(rx_queue_index); + retval = tsnep_rx_open(adapter, addr, + adapter->queue[i].rx); + if (retval) + goto failed; + rx_queue_index++; + } + } + + retval = netif_set_real_num_tx_queues(adapter->netdev, + adapter->num_tx_queues); + if (retval) + goto failed; + retval = netif_set_real_num_rx_queues(adapter->netdev, + adapter->num_rx_queues); + if (retval) + goto failed; + + for (i = 0; i < adapter->num_queues; i++) { + netif_napi_add(adapter->netdev, &adapter->queue[i].napi, + tsnep_poll, 64); + napi_enable(&adapter->queue[i].napi); + + tsnep_enable_irq(adapter, adapter->queue[i].irq_mask); + } + + return 0; + +failed: + for (i = 0; i < adapter->num_queues; i++) { + if (adapter->queue[i].rx) + tsnep_rx_close(adapter->queue[i].rx); + if (adapter->queue[i].tx) + tsnep_tx_close(adapter->queue[i].tx); + } + tsnep_phy_close(adapter); + return retval; +} + +static int tsnep_netdev_close(struct net_device *netdev) +{ + struct tsnep_adapter *adapter = netdev_priv(netdev); + int i; + + for (i = 0; i < adapter->num_queues; i++) { + tsnep_disable_irq(adapter, adapter->queue[i].irq_mask); + + napi_disable(&adapter->queue[i].napi); + netif_napi_del(&adapter->queue[i].napi); + + if (adapter->queue[i].rx) + tsnep_rx_close(adapter->queue[i].rx); + if (adapter->queue[i].tx) + tsnep_tx_close(adapter->queue[i].tx); + } + + tsnep_phy_close(adapter); + + return 0; +} + +static netdev_tx_t tsnep_netdev_xmit_frame(struct sk_buff *skb, + struct net_device *netdev) +{ + struct tsnep_adapter *adapter = netdev_priv(netdev); + u16 queue_mapping = skb_get_queue_mapping(skb); + + if (queue_mapping >= adapter->num_tx_queues) + queue_mapping = 0; + + return tsnep_xmit_frame_ring(skb, &adapter->tx[queue_mapping]); +} + +static int tsnep_netdev_ioctl(struct net_device *netdev, struct ifreq *ifr, + int cmd) +{ + if (!netif_running(netdev)) + return -EINVAL; + if (cmd == SIOCSHWTSTAMP || cmd == SIOCGHWTSTAMP) + return tsnep_ptp_ioctl(netdev, ifr, cmd); + return phy_mii_ioctl(netdev->phydev, ifr, cmd); +} + +static void tsnep_netdev_set_multicast(struct net_device *netdev) +{ + struct tsnep_adapter *adapter = netdev_priv(netdev); + + u16 rx_filter = 0; + + /* configured MAC address and broadcasts are never filtered */ + if (netdev->flags & IFF_PROMISC) { + rx_filter |= TSNEP_RX_FILTER_ACCEPT_ALL_MULTICASTS; + rx_filter |= TSNEP_RX_FILTER_ACCEPT_ALL_UNICASTS; + } else if (!netdev_mc_empty(netdev) || (netdev->flags & IFF_ALLMULTI)) { + rx_filter |= TSNEP_RX_FILTER_ACCEPT_ALL_MULTICASTS; + } + iowrite16(rx_filter, adapter->addr + TSNEP_RX_FILTER); +} + +static void tsnep_netdev_get_stats64(struct net_device *netdev, + struct rtnl_link_stats64 *stats) +{ + struct tsnep_adapter *adapter = netdev_priv(netdev); + u32 reg; + u32 val; + int i; + + for (i = 0; i < adapter->num_tx_queues; i++) { + stats->tx_packets += adapter->tx[i].packets; + stats->tx_bytes += adapter->tx[i].bytes; + stats->tx_dropped += adapter->tx[i].dropped; + } + for (i = 0; i < adapter->num_rx_queues; i++) { + stats->rx_packets += adapter->rx[i].packets; + stats->rx_bytes += adapter->rx[i].bytes; + stats->rx_dropped += adapter->rx[i].dropped; + stats->multicast += adapter->rx[i].multicast; + + reg = ioread32(adapter->addr + TSNEP_QUEUE(i) + + TSNEP_RX_STATISTIC); + val = (reg & TSNEP_RX_STATISTIC_NO_DESC_MASK) >> + TSNEP_RX_STATISTIC_NO_DESC_SHIFT; + stats->rx_dropped += val; + val = (reg & TSNEP_RX_STATISTIC_BUFFER_TOO_SMALL_MASK) >> + TSNEP_RX_STATISTIC_BUFFER_TOO_SMALL_SHIFT; + stats->rx_dropped += val; + val = (reg & TSNEP_RX_STATISTIC_FIFO_OVERFLOW_MASK) >> + TSNEP_RX_STATISTIC_FIFO_OVERFLOW_SHIFT; + stats->rx_errors += val; + stats->rx_fifo_errors += val; + val = (reg & TSNEP_RX_STATISTIC_INVALID_FRAME_MASK) >> + TSNEP_RX_STATISTIC_INVALID_FRAME_SHIFT; + stats->rx_errors += val; + stats->rx_frame_errors += val; + } + + reg = ioread32(adapter->addr + ECM_STAT); + val = (reg & ECM_STAT_RX_ERR_MASK) >> ECM_STAT_RX_ERR_SHIFT; + stats->rx_errors += val; + val = (reg & ECM_STAT_INV_FRM_MASK) >> ECM_STAT_INV_FRM_SHIFT; + stats->rx_errors += val; + stats->rx_crc_errors += val; + val = (reg & ECM_STAT_FWD_RX_ERR_MASK) >> ECM_STAT_FWD_RX_ERR_SHIFT; + stats->rx_errors += val; +} + +static void tsnep_mac_set_address(struct tsnep_adapter *adapter, u8 *addr) +{ + iowrite32(*(u32 *)addr, adapter->addr + TSNEP_MAC_ADDRESS_LOW); + iowrite16(*(u16 *)(addr + sizeof(u32)), + adapter->addr + TSNEP_MAC_ADDRESS_HIGH); + + ether_addr_copy(adapter->mac_address, addr); + netif_info(adapter, drv, adapter->netdev, "MAC address set to %pM\n", + addr); +} + +static int tsnep_netdev_set_mac_address(struct net_device *netdev, void *addr) +{ + struct tsnep_adapter *adapter = netdev_priv(netdev); + struct sockaddr *sock_addr = addr; + int retval; + + retval = eth_prepare_mac_addr_change(netdev, sock_addr); + if (retval) + return retval; + eth_hw_addr_set(netdev, sock_addr->sa_data); + tsnep_mac_set_address(adapter, sock_addr->sa_data); + + return 0; +} + +static const struct net_device_ops tsnep_netdev_ops = { + .ndo_open = tsnep_netdev_open, + .ndo_stop = tsnep_netdev_close, + .ndo_start_xmit = tsnep_netdev_xmit_frame, + .ndo_eth_ioctl = tsnep_netdev_ioctl, + .ndo_set_rx_mode = tsnep_netdev_set_multicast, + + .ndo_get_stats64 = tsnep_netdev_get_stats64, + .ndo_set_mac_address = tsnep_netdev_set_mac_address, + .ndo_setup_tc = tsnep_tc_setup, +}; + +static int tsnep_mac_init(struct tsnep_adapter *adapter) +{ + int retval; + + /* initialize RX filtering, at least configured MAC address and + * broadcast are not filtered + */ + iowrite16(0, adapter->addr + TSNEP_RX_FILTER); + + /* try to get MAC address in the following order: + * - device tree + * - valid MAC address already set + * - MAC address register if valid + * - random MAC address + */ + retval = of_get_mac_address(adapter->pdev->dev.of_node, + adapter->mac_address); + if (retval == -EPROBE_DEFER) + return retval; + if (retval && !is_valid_ether_addr(adapter->mac_address)) { + *(u32 *)adapter->mac_address = + ioread32(adapter->addr + TSNEP_MAC_ADDRESS_LOW); + *(u16 *)(adapter->mac_address + sizeof(u32)) = + ioread16(adapter->addr + TSNEP_MAC_ADDRESS_HIGH); + if (!is_valid_ether_addr(adapter->mac_address)) + eth_random_addr(adapter->mac_address); + } + + tsnep_mac_set_address(adapter, adapter->mac_address); + eth_hw_addr_set(adapter->netdev, adapter->mac_address); + + return 0; +} + +static int tsnep_mdio_init(struct tsnep_adapter *adapter) +{ + struct device_node *np = adapter->pdev->dev.of_node; + int retval; + + if (np) { + np = of_get_child_by_name(np, "mdio"); + if (!np) + return 0; + + adapter->suppress_preamble = + of_property_read_bool(np, "suppress-preamble"); + } + + adapter->mdiobus = devm_mdiobus_alloc(&adapter->pdev->dev); + if (!adapter->mdiobus) { + retval = -ENOMEM; + + goto out; + } + + adapter->mdiobus->priv = (void *)adapter; + adapter->mdiobus->parent = &adapter->pdev->dev; + adapter->mdiobus->read = tsnep_mdiobus_read; + adapter->mdiobus->write = tsnep_mdiobus_write; + adapter->mdiobus->name = TSNEP "-mdiobus"; + snprintf(adapter->mdiobus->id, MII_BUS_ID_SIZE, "%s", + adapter->pdev->name); + + /* do not scan broadcast address */ + adapter->mdiobus->phy_mask = 0x0000001; + + retval = of_mdiobus_register(adapter->mdiobus, np); + +out: + if (np) + of_node_put(np); + + return retval; +} + +static int tsnep_phy_init(struct tsnep_adapter *adapter) +{ + struct device_node *phy_node; + int retval; + + retval = of_get_phy_mode(adapter->pdev->dev.of_node, + &adapter->phy_mode); + if (retval) + adapter->phy_mode = PHY_INTERFACE_MODE_GMII; + + phy_node = of_parse_phandle(adapter->pdev->dev.of_node, "phy-handle", + 0); + adapter->phydev = of_phy_find_device(phy_node); + of_node_put(phy_node); + if (!adapter->phydev && adapter->mdiobus) + adapter->phydev = phy_find_first(adapter->mdiobus); + if (!adapter->phydev) + return -EIO; + + return 0; +} + +static int tsnep_probe(struct platform_device *pdev) +{ + struct tsnep_adapter *adapter; + struct net_device *netdev; + struct resource *io; + u32 type; + int revision; + int version; + int retval; + + netdev = devm_alloc_etherdev_mqs(&pdev->dev, + sizeof(struct tsnep_adapter), + TSNEP_MAX_QUEUES, TSNEP_MAX_QUEUES); + if (!netdev) + return -ENODEV; + SET_NETDEV_DEV(netdev, &pdev->dev); + adapter = netdev_priv(netdev); + platform_set_drvdata(pdev, adapter); + adapter->pdev = pdev; + adapter->dmadev = &pdev->dev; + adapter->netdev = netdev; + adapter->msg_enable = NETIF_MSG_DRV | NETIF_MSG_PROBE | + NETIF_MSG_LINK | NETIF_MSG_IFUP | + NETIF_MSG_IFDOWN | NETIF_MSG_TX_QUEUED; + + netdev->min_mtu = ETH_MIN_MTU; + netdev->max_mtu = TSNEP_MAX_FRAME_SIZE; + + mutex_init(&adapter->gate_control_lock); + + io = platform_get_resource(pdev, IORESOURCE_MEM, 0); + adapter->addr = devm_ioremap_resource(&pdev->dev, io); + if (IS_ERR(adapter->addr)) + return PTR_ERR(adapter->addr); + adapter->irq = platform_get_irq(pdev, 0); + netdev->mem_start = io->start; + netdev->mem_end = io->end; + netdev->irq = adapter->irq; + + type = ioread32(adapter->addr + ECM_TYPE); + revision = (type & ECM_REVISION_MASK) >> ECM_REVISION_SHIFT; + version = (type & ECM_VERSION_MASK) >> ECM_VERSION_SHIFT; + adapter->gate_control = type & ECM_GATE_CONTROL; + + adapter->num_tx_queues = TSNEP_QUEUES; + adapter->num_rx_queues = TSNEP_QUEUES; + adapter->num_queues = TSNEP_QUEUES; + adapter->queue[0].tx = &adapter->tx[0]; + adapter->queue[0].rx = &adapter->rx[0]; + adapter->queue[0].irq_mask = ECM_INT_TX_0 | ECM_INT_RX_0; + + tsnep_disable_irq(adapter, ECM_INT_ALL); + retval = devm_request_irq(&adapter->pdev->dev, adapter->irq, tsnep_irq, + 0, TSNEP, adapter); + if (retval != 0) { + dev_err(&adapter->pdev->dev, "can't get assigned irq %d.\n", + adapter->irq); + return retval; + } + tsnep_enable_irq(adapter, ECM_INT_LINK); + + retval = tsnep_mac_init(adapter); + if (retval) + goto mac_init_failed; + + retval = tsnep_mdio_init(adapter); + if (retval) + goto mdio_init_failed; + + retval = tsnep_phy_init(adapter); + if (retval) + goto phy_init_failed; + + retval = tsnep_ptp_init(adapter); + if (retval) + goto ptp_init_failed; + + retval = tsnep_tc_init(adapter); + if (retval) + goto tc_init_failed; + + netdev->netdev_ops = &tsnep_netdev_ops; + netdev->ethtool_ops = &tsnep_ethtool_ops; + netdev->features = NETIF_F_SG; + netdev->hw_features = netdev->features; + + /* carrier off reporting is important to ethtool even BEFORE open */ + netif_carrier_off(netdev); + + retval = register_netdev(netdev); + if (retval) + goto register_failed; + + dev_info(&adapter->pdev->dev, "device version %d.%02d\n", version, + revision); + if (adapter->gate_control) + dev_info(&adapter->pdev->dev, "gate control detected\n"); + + return 0; + +register_failed: + tsnep_tc_cleanup(adapter); +tc_init_failed: + tsnep_ptp_cleanup(adapter); +ptp_init_failed: +phy_init_failed: + if (adapter->mdiobus) + mdiobus_unregister(adapter->mdiobus); +mdio_init_failed: +mac_init_failed: + tsnep_disable_irq(adapter, ECM_INT_ALL); + return retval; +} + +static int tsnep_remove(struct platform_device *pdev) +{ + struct tsnep_adapter *adapter = platform_get_drvdata(pdev); + + unregister_netdev(adapter->netdev); + + tsnep_tc_cleanup(adapter); + + tsnep_ptp_cleanup(adapter); + + if (adapter->mdiobus) + mdiobus_unregister(adapter->mdiobus); + + tsnep_disable_irq(adapter, ECM_INT_ALL); + + return 0; +} + +static const struct of_device_id tsnep_of_match[] = { + { .compatible = "engleder,tsnep", }, +{ }, +}; +MODULE_DEVICE_TABLE(of, tsnep_of_match); + +static struct platform_driver tsnep_driver = { + .driver = { + .name = TSNEP, + .of_match_table = of_match_ptr(tsnep_of_match), + }, + .probe = tsnep_probe, + .remove = tsnep_remove, +}; +module_platform_driver(tsnep_driver); + +MODULE_AUTHOR("Gerhard Engleder <gerhard@engleder-embedded.com>"); +MODULE_DESCRIPTION("TSN endpoint Ethernet MAC driver"); +MODULE_LICENSE("GPL"); |