diff options
Diffstat (limited to 'drivers/net/ethernet/actions/owl-emac.c')
| -rw-r--r-- | drivers/net/ethernet/actions/owl-emac.c | 1625 |
1 files changed, 1625 insertions, 0 deletions
diff --git a/drivers/net/ethernet/actions/owl-emac.c b/drivers/net/ethernet/actions/owl-emac.c new file mode 100644 index 000000000000..b8e771c2bc40 --- /dev/null +++ b/drivers/net/ethernet/actions/owl-emac.c @@ -0,0 +1,1625 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Actions Semi Owl SoCs Ethernet MAC driver + * + * Copyright (c) 2012 Actions Semi Inc. + * Copyright (c) 2021 Cristian Ciocaltea <cristian.ciocaltea@gmail.com> + */ + +#include <linux/circ_buf.h> +#include <linux/clk.h> +#include <linux/dma-mapping.h> +#include <linux/etherdevice.h> +#include <linux/of_mdio.h> +#include <linux/of_net.h> +#include <linux/platform_device.h> +#include <linux/pm.h> +#include <linux/reset.h> + +#include "owl-emac.h" + +#define OWL_EMAC_DEFAULT_MSG_ENABLE (NETIF_MSG_DRV | \ + NETIF_MSG_PROBE | \ + NETIF_MSG_LINK) + +static u32 owl_emac_reg_read(struct owl_emac_priv *priv, u32 reg) +{ + return readl(priv->base + reg); +} + +static void owl_emac_reg_write(struct owl_emac_priv *priv, u32 reg, u32 data) +{ + writel(data, priv->base + reg); +} + +static u32 owl_emac_reg_update(struct owl_emac_priv *priv, + u32 reg, u32 mask, u32 val) +{ + u32 data, old_val; + + data = owl_emac_reg_read(priv, reg); + old_val = data & mask; + + data &= ~mask; + data |= val & mask; + + owl_emac_reg_write(priv, reg, data); + + return old_val; +} + +static void owl_emac_reg_set(struct owl_emac_priv *priv, u32 reg, u32 bits) +{ + owl_emac_reg_update(priv, reg, bits, bits); +} + +static void owl_emac_reg_clear(struct owl_emac_priv *priv, u32 reg, u32 bits) +{ + owl_emac_reg_update(priv, reg, bits, 0); +} + +static struct device *owl_emac_get_dev(struct owl_emac_priv *priv) +{ + return priv->netdev->dev.parent; +} + +static void owl_emac_irq_enable(struct owl_emac_priv *priv) +{ + /* Enable all interrupts except TU. + * + * Note the NIE and AIE bits shall also be set in order to actually + * enable the selected interrupts. + */ + owl_emac_reg_write(priv, OWL_EMAC_REG_MAC_CSR7, + OWL_EMAC_BIT_MAC_CSR7_NIE | + OWL_EMAC_BIT_MAC_CSR7_AIE | + OWL_EMAC_BIT_MAC_CSR7_ALL_NOT_TUE); +} + +static void owl_emac_irq_disable(struct owl_emac_priv *priv) +{ + /* Disable all interrupts. + * + * WARNING: Unset only the NIE and AIE bits in CSR7 to workaround an + * unexpected side effect (MAC hardware bug?!) where some bits in the + * status register (CSR5) are cleared automatically before being able + * to read them via owl_emac_irq_clear(). + */ + owl_emac_reg_write(priv, OWL_EMAC_REG_MAC_CSR7, + OWL_EMAC_BIT_MAC_CSR7_ALL_NOT_TUE); +} + +static u32 owl_emac_irq_status(struct owl_emac_priv *priv) +{ + return owl_emac_reg_read(priv, OWL_EMAC_REG_MAC_CSR5); +} + +static u32 owl_emac_irq_clear(struct owl_emac_priv *priv) +{ + u32 val = owl_emac_irq_status(priv); + + owl_emac_reg_write(priv, OWL_EMAC_REG_MAC_CSR5, val); + + return val; +} + +static dma_addr_t owl_emac_dma_map_rx(struct owl_emac_priv *priv, + struct sk_buff *skb) +{ + struct device *dev = owl_emac_get_dev(priv); + + /* Buffer pointer for the RX DMA descriptor must be word aligned. */ + return dma_map_single(dev, skb_tail_pointer(skb), + skb_tailroom(skb), DMA_FROM_DEVICE); +} + +static void owl_emac_dma_unmap_rx(struct owl_emac_priv *priv, + struct sk_buff *skb, dma_addr_t dma_addr) +{ + struct device *dev = owl_emac_get_dev(priv); + + dma_unmap_single(dev, dma_addr, skb_tailroom(skb), DMA_FROM_DEVICE); +} + +static dma_addr_t owl_emac_dma_map_tx(struct owl_emac_priv *priv, + struct sk_buff *skb) +{ + struct device *dev = owl_emac_get_dev(priv); + + return dma_map_single(dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE); +} + +static void owl_emac_dma_unmap_tx(struct owl_emac_priv *priv, + struct sk_buff *skb, dma_addr_t dma_addr) +{ + struct device *dev = owl_emac_get_dev(priv); + + dma_unmap_single(dev, dma_addr, skb_headlen(skb), DMA_TO_DEVICE); +} + +static unsigned int owl_emac_ring_num_unused(struct owl_emac_ring *ring) +{ + return CIRC_SPACE(ring->head, ring->tail, ring->size); +} + +static unsigned int owl_emac_ring_get_next(struct owl_emac_ring *ring, + unsigned int cur) +{ + return (cur + 1) & (ring->size - 1); +} + +static void owl_emac_ring_push_head(struct owl_emac_ring *ring) +{ + ring->head = owl_emac_ring_get_next(ring, ring->head); +} + +static void owl_emac_ring_pop_tail(struct owl_emac_ring *ring) +{ + ring->tail = owl_emac_ring_get_next(ring, ring->tail); +} + +static struct sk_buff *owl_emac_alloc_skb(struct net_device *netdev) +{ + struct sk_buff *skb; + int offset; + + skb = netdev_alloc_skb(netdev, OWL_EMAC_RX_FRAME_MAX_LEN + + OWL_EMAC_SKB_RESERVE); + if (unlikely(!skb)) + return NULL; + + /* Ensure 4 bytes DMA alignment. */ + offset = ((uintptr_t)skb->data) & (OWL_EMAC_SKB_ALIGN - 1); + if (unlikely(offset)) + skb_reserve(skb, OWL_EMAC_SKB_ALIGN - offset); + + return skb; +} + +static int owl_emac_ring_prepare_rx(struct owl_emac_priv *priv) +{ + struct owl_emac_ring *ring = &priv->rx_ring; + struct device *dev = owl_emac_get_dev(priv); + struct net_device *netdev = priv->netdev; + struct owl_emac_ring_desc *desc; + struct sk_buff *skb; + dma_addr_t dma_addr; + int i; + + for (i = 0; i < ring->size; i++) { + skb = owl_emac_alloc_skb(netdev); + if (!skb) + return -ENOMEM; + + dma_addr = owl_emac_dma_map_rx(priv, skb); + if (dma_mapping_error(dev, dma_addr)) { + dev_kfree_skb(skb); + return -ENOMEM; + } + + desc = &ring->descs[i]; + desc->status = OWL_EMAC_BIT_RDES0_OWN; + desc->control = skb_tailroom(skb) & OWL_EMAC_MSK_RDES1_RBS1; + desc->buf_addr = dma_addr; + desc->reserved = 0; + + ring->skbs[i] = skb; + ring->skbs_dma[i] = dma_addr; + } + + desc->control |= OWL_EMAC_BIT_RDES1_RER; + + ring->head = 0; + ring->tail = 0; + + return 0; +} + +static void owl_emac_ring_prepare_tx(struct owl_emac_priv *priv) +{ + struct owl_emac_ring *ring = &priv->tx_ring; + struct owl_emac_ring_desc *desc; + int i; + + for (i = 0; i < ring->size; i++) { + desc = &ring->descs[i]; + + desc->status = 0; + desc->control = OWL_EMAC_BIT_TDES1_IC; + desc->buf_addr = 0; + desc->reserved = 0; + } + + desc->control |= OWL_EMAC_BIT_TDES1_TER; + + memset(ring->skbs_dma, 0, sizeof(dma_addr_t) * ring->size); + + ring->head = 0; + ring->tail = 0; +} + +static void owl_emac_ring_unprepare_rx(struct owl_emac_priv *priv) +{ + struct owl_emac_ring *ring = &priv->rx_ring; + int i; + + for (i = 0; i < ring->size; i++) { + ring->descs[i].status = 0; + + if (!ring->skbs_dma[i]) + continue; + + owl_emac_dma_unmap_rx(priv, ring->skbs[i], ring->skbs_dma[i]); + ring->skbs_dma[i] = 0; + + dev_kfree_skb(ring->skbs[i]); + ring->skbs[i] = NULL; + } +} + +static void owl_emac_ring_unprepare_tx(struct owl_emac_priv *priv) +{ + struct owl_emac_ring *ring = &priv->tx_ring; + int i; + + for (i = 0; i < ring->size; i++) { + ring->descs[i].status = 0; + + if (!ring->skbs_dma[i]) + continue; + + owl_emac_dma_unmap_tx(priv, ring->skbs[i], ring->skbs_dma[i]); + ring->skbs_dma[i] = 0; + + dev_kfree_skb(ring->skbs[i]); + ring->skbs[i] = NULL; + } +} + +static int owl_emac_ring_alloc(struct device *dev, struct owl_emac_ring *ring, + unsigned int size) +{ + ring->descs = dmam_alloc_coherent(dev, + sizeof(struct owl_emac_ring_desc) * size, + &ring->descs_dma, GFP_KERNEL); + if (!ring->descs) + return -ENOMEM; + + ring->skbs = devm_kcalloc(dev, size, sizeof(struct sk_buff *), + GFP_KERNEL); + if (!ring->skbs) + return -ENOMEM; + + ring->skbs_dma = devm_kcalloc(dev, size, sizeof(dma_addr_t), + GFP_KERNEL); + if (!ring->skbs_dma) + return -ENOMEM; + + ring->size = size; + + return 0; +} + +static void owl_emac_dma_cmd_resume_rx(struct owl_emac_priv *priv) +{ + owl_emac_reg_write(priv, OWL_EMAC_REG_MAC_CSR2, + OWL_EMAC_VAL_MAC_CSR2_RPD); +} + +static void owl_emac_dma_cmd_resume_tx(struct owl_emac_priv *priv) +{ + owl_emac_reg_write(priv, OWL_EMAC_REG_MAC_CSR1, + OWL_EMAC_VAL_MAC_CSR1_TPD); +} + +static u32 owl_emac_dma_cmd_set_tx(struct owl_emac_priv *priv, u32 status) +{ + return owl_emac_reg_update(priv, OWL_EMAC_REG_MAC_CSR6, + OWL_EMAC_BIT_MAC_CSR6_ST, status); +} + +static u32 owl_emac_dma_cmd_start_tx(struct owl_emac_priv *priv) +{ + return owl_emac_dma_cmd_set_tx(priv, ~0); +} + +static u32 owl_emac_dma_cmd_set(struct owl_emac_priv *priv, u32 status) +{ + return owl_emac_reg_update(priv, OWL_EMAC_REG_MAC_CSR6, + OWL_EMAC_MSK_MAC_CSR6_STSR, status); +} + +static u32 owl_emac_dma_cmd_start(struct owl_emac_priv *priv) +{ + return owl_emac_dma_cmd_set(priv, ~0); +} + +static u32 owl_emac_dma_cmd_stop(struct owl_emac_priv *priv) +{ + return owl_emac_dma_cmd_set(priv, 0); +} + +static void owl_emac_set_hw_mac_addr(struct net_device *netdev) +{ + struct owl_emac_priv *priv = netdev_priv(netdev); + u8 *mac_addr = netdev->dev_addr; + u32 addr_high, addr_low; + + addr_high = mac_addr[0] << 8 | mac_addr[1]; + addr_low = mac_addr[2] << 24 | mac_addr[3] << 16 | + mac_addr[4] << 8 | mac_addr[5]; + + owl_emac_reg_write(priv, OWL_EMAC_REG_MAC_CSR17, addr_high); + owl_emac_reg_write(priv, OWL_EMAC_REG_MAC_CSR16, addr_low); +} + +static void owl_emac_update_link_state(struct owl_emac_priv *priv) +{ + u32 val, status; + + if (priv->pause) { + val = OWL_EMAC_BIT_MAC_CSR20_FCE | OWL_EMAC_BIT_MAC_CSR20_TUE; + val |= OWL_EMAC_BIT_MAC_CSR20_TPE | OWL_EMAC_BIT_MAC_CSR20_RPE; + val |= OWL_EMAC_BIT_MAC_CSR20_BPE; + } else { + val = 0; + } + + /* Update flow control. */ + owl_emac_reg_write(priv, OWL_EMAC_REG_MAC_CSR20, val); + + val = (priv->speed == SPEED_100) ? OWL_EMAC_VAL_MAC_CSR6_SPEED_100M : + OWL_EMAC_VAL_MAC_CSR6_SPEED_10M; + val <<= OWL_EMAC_OFF_MAC_CSR6_SPEED; + + if (priv->duplex == DUPLEX_FULL) + val |= OWL_EMAC_BIT_MAC_CSR6_FD; + + spin_lock_bh(&priv->lock); + + /* Temporarily stop DMA TX & RX. */ + status = owl_emac_dma_cmd_stop(priv); + + /* Update operation modes. */ + owl_emac_reg_update(priv, OWL_EMAC_REG_MAC_CSR6, + OWL_EMAC_MSK_MAC_CSR6_SPEED | + OWL_EMAC_BIT_MAC_CSR6_FD, val); + + /* Restore DMA TX & RX status. */ + owl_emac_dma_cmd_set(priv, status); + + spin_unlock_bh(&priv->lock); +} + +static void owl_emac_adjust_link(struct net_device *netdev) +{ + struct owl_emac_priv *priv = netdev_priv(netdev); + struct phy_device *phydev = netdev->phydev; + bool state_changed = false; + + if (phydev->link) { + if (!priv->link) { + priv->link = phydev->link; + state_changed = true; + } + + if (priv->speed != phydev->speed) { + priv->speed = phydev->speed; + state_changed = true; + } + + if (priv->duplex != phydev->duplex) { + priv->duplex = phydev->duplex; + state_changed = true; + } + + if (priv->pause != phydev->pause) { + priv->pause = phydev->pause; + state_changed = true; + } + } else { + if (priv->link) { + priv->link = phydev->link; + state_changed = true; + } + } + + if (state_changed) { + if (phydev->link) + owl_emac_update_link_state(priv); + + if (netif_msg_link(priv)) + phy_print_status(phydev); + } +} + +static irqreturn_t owl_emac_handle_irq(int irq, void *data) +{ + struct net_device *netdev = data; + struct owl_emac_priv *priv = netdev_priv(netdev); + + if (netif_running(netdev)) { + owl_emac_irq_disable(priv); + napi_schedule(&priv->napi); + } + + return IRQ_HANDLED; +} + +static void owl_emac_ether_addr_push(u8 **dst, const u8 *src) +{ + u32 *a = (u32 *)(*dst); + const u16 *b = (const u16 *)src; + + a[0] = b[0]; + a[1] = b[1]; + a[2] = b[2]; + + *dst += 12; +} + +static void +owl_emac_setup_frame_prepare(struct owl_emac_priv *priv, struct sk_buff *skb) +{ + const u8 bcast_addr[] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF }; + const u8 *mac_addr = priv->netdev->dev_addr; + u8 *frame; + int i; + + skb_put(skb, OWL_EMAC_SETUP_FRAME_LEN); + + frame = skb->data; + memset(frame, 0, skb->len); + + owl_emac_ether_addr_push(&frame, mac_addr); + owl_emac_ether_addr_push(&frame, bcast_addr); + + /* Fill multicast addresses. */ + WARN_ON(priv->mcaddr_list.count >= OWL_EMAC_MAX_MULTICAST_ADDRS); + for (i = 0; i < priv->mcaddr_list.count; i++) { + mac_addr = priv->mcaddr_list.addrs[i]; + owl_emac_ether_addr_push(&frame, mac_addr); + } +} + +/* The setup frame is a special descriptor which is used to provide physical + * addresses (i.e. mac, broadcast and multicast) to the MAC hardware for + * filtering purposes. To be recognized as a setup frame, the TDES1_SET bit + * must be set in the TX descriptor control field. + */ +static int owl_emac_setup_frame_xmit(struct owl_emac_priv *priv) +{ + struct owl_emac_ring *ring = &priv->tx_ring; + struct net_device *netdev = priv->netdev; + struct owl_emac_ring_desc *desc; + struct sk_buff *skb; + unsigned int tx_head; + u32 status, control; + dma_addr_t dma_addr; + int ret; + + skb = owl_emac_alloc_skb(netdev); + if (!skb) + return -ENOMEM; + + owl_emac_setup_frame_prepare(priv, skb); + + dma_addr = owl_emac_dma_map_tx(priv, skb); + if (dma_mapping_error(owl_emac_get_dev(priv), dma_addr)) { + ret = -ENOMEM; + goto err_free_skb; + } + + spin_lock_bh(&priv->lock); + + tx_head = ring->head; + desc = &ring->descs[tx_head]; + + status = READ_ONCE(desc->status); + control = READ_ONCE(desc->control); + dma_rmb(); /* Ensure data has been read before used. */ + + if (unlikely(status & OWL_EMAC_BIT_TDES0_OWN) || + !owl_emac_ring_num_unused(ring)) { + spin_unlock_bh(&priv->lock); + owl_emac_dma_unmap_tx(priv, skb, dma_addr); + ret = -EBUSY; + goto err_free_skb; + } + + ring->skbs[tx_head] = skb; + ring->skbs_dma[tx_head] = dma_addr; + + control &= OWL_EMAC_BIT_TDES1_IC | OWL_EMAC_BIT_TDES1_TER; /* Maintain bits */ + control |= OWL_EMAC_BIT_TDES1_SET; + control |= OWL_EMAC_MSK_TDES1_TBS1 & skb->len; + + WRITE_ONCE(desc->control, control); + WRITE_ONCE(desc->buf_addr, dma_addr); + dma_wmb(); /* Flush descriptor before changing ownership. */ + WRITE_ONCE(desc->status, OWL_EMAC_BIT_TDES0_OWN); + + owl_emac_ring_push_head(ring); + + /* Temporarily enable DMA TX. */ + status = owl_emac_dma_cmd_start_tx(priv); + + /* Trigger setup frame processing. */ + owl_emac_dma_cmd_resume_tx(priv); + + /* Restore DMA TX status. */ + owl_emac_dma_cmd_set_tx(priv, status); + + /* Stop regular TX until setup frame is processed. */ + netif_stop_queue(netdev); + + spin_unlock_bh(&priv->lock); + + return 0; + +err_free_skb: + dev_kfree_skb(skb); + return ret; +} + +static netdev_tx_t owl_emac_ndo_start_xmit(struct sk_buff *skb, + struct net_device *netdev) +{ + struct owl_emac_priv *priv = netdev_priv(netdev); + struct device *dev = owl_emac_get_dev(priv); + struct owl_emac_ring *ring = &priv->tx_ring; + struct owl_emac_ring_desc *desc; + unsigned int tx_head; + u32 status, control; + dma_addr_t dma_addr; + + dma_addr = owl_emac_dma_map_tx(priv, skb); + if (dma_mapping_error(dev, dma_addr)) { + dev_err_ratelimited(&netdev->dev, "TX DMA mapping failed\n"); + dev_kfree_skb(skb); + netdev->stats.tx_dropped++; + return NETDEV_TX_OK; + } + + spin_lock_bh(&priv->lock); + + tx_head = ring->head; + desc = &ring->descs[tx_head]; + + status = READ_ONCE(desc->status); + control = READ_ONCE(desc->control); + dma_rmb(); /* Ensure data has been read before used. */ + + if (!owl_emac_ring_num_unused(ring) || + unlikely(status & OWL_EMAC_BIT_TDES0_OWN)) { + netif_stop_queue(netdev); + spin_unlock_bh(&priv->lock); + + dev_dbg_ratelimited(&netdev->dev, "TX buffer full, status=0x%08x\n", + owl_emac_irq_status(priv)); + owl_emac_dma_unmap_tx(priv, skb, dma_addr); + netdev->stats.tx_dropped++; + return NETDEV_TX_BUSY; + } + + ring->skbs[tx_head] = skb; + ring->skbs_dma[tx_head] = dma_addr; + + control &= OWL_EMAC_BIT_TDES1_IC | OWL_EMAC_BIT_TDES1_TER; /* Maintain bits */ + control |= OWL_EMAC_BIT_TDES1_FS | OWL_EMAC_BIT_TDES1_LS; + control |= OWL_EMAC_MSK_TDES1_TBS1 & skb->len; + + WRITE_ONCE(desc->control, control); + WRITE_ONCE(desc->buf_addr, dma_addr); + dma_wmb(); /* Flush descriptor before changing ownership. */ + WRITE_ONCE(desc->status, OWL_EMAC_BIT_TDES0_OWN); + + owl_emac_dma_cmd_resume_tx(priv); + owl_emac_ring_push_head(ring); + + /* FIXME: The transmission is currently restricted to a single frame + * at a time as a workaround for a MAC hardware bug that causes random + * freeze of the TX queue processor. + */ + netif_stop_queue(netdev); + + spin_unlock_bh(&priv->lock); + + return NETDEV_TX_OK; +} + +static bool owl_emac_tx_complete_tail(struct owl_emac_priv *priv) +{ + struct owl_emac_ring *ring = &priv->tx_ring; + struct net_device *netdev = priv->netdev; + struct owl_emac_ring_desc *desc; + struct sk_buff *skb; + unsigned int tx_tail; + u32 status; + + tx_tail = ring->tail; + desc = &ring->descs[tx_tail]; + + status = READ_ONCE(desc->status); + dma_rmb(); /* Ensure data has been read before used. */ + + if (status & OWL_EMAC_BIT_TDES0_OWN) + return false; + + /* Check for errors. */ + if (status & OWL_EMAC_BIT_TDES0_ES) { + dev_dbg_ratelimited(&netdev->dev, + "TX complete error status: 0x%08x\n", + status); + + netdev->stats.tx_errors++; + + if (status & OWL_EMAC_BIT_TDES0_UF) + netdev->stats.tx_fifo_errors++; + + if (status & OWL_EMAC_BIT_TDES0_EC) + netdev->stats.tx_aborted_errors++; + + if (status & OWL_EMAC_BIT_TDES0_LC) + netdev->stats.tx_window_errors++; + + if (status & OWL_EMAC_BIT_TDES0_NC) + netdev->stats.tx_heartbeat_errors++; + + if (status & OWL_EMAC_BIT_TDES0_LO) + netdev->stats.tx_carrier_errors++; + } else { + netdev->stats.tx_packets++; + netdev->stats.tx_bytes += ring->skbs[tx_tail]->len; + } + + /* Some collisions occurred, but pkt has been transmitted. */ + if (status & OWL_EMAC_BIT_TDES0_DE) + netdev->stats.collisions++; + + skb = ring->skbs[tx_tail]; + owl_emac_dma_unmap_tx(priv, skb, ring->skbs_dma[tx_tail]); + dev_kfree_skb(skb); + + ring->skbs[tx_tail] = NULL; + ring->skbs_dma[tx_tail] = 0; + + owl_emac_ring_pop_tail(ring); + + if (unlikely(netif_queue_stopped(netdev))) + netif_wake_queue(netdev); + + return true; +} + +static void owl_emac_tx_complete(struct owl_emac_priv *priv) +{ + struct owl_emac_ring *ring = &priv->tx_ring; + struct net_device *netdev = priv->netdev; + unsigned int tx_next; + u32 status; + + spin_lock(&priv->lock); + + while (ring->tail != ring->head) { + if (!owl_emac_tx_complete_tail(priv)) + break; + } + + /* FIXME: This is a workaround for a MAC hardware bug not clearing + * (sometimes) the OWN bit for a transmitted frame descriptor. + * + * At this point, when TX queue is full, the tail descriptor has the + * OWN bit set, which normally means the frame has not been processed + * or transmitted yet. But if there is at least one descriptor in the + * queue having the OWN bit cleared, we can safely assume the tail + * frame has been also processed by the MAC hardware. + * + * If that's the case, let's force the frame completion by manually + * clearing the OWN bit. + */ + if (unlikely(!owl_emac_ring_num_unused(ring))) { + tx_next = ring->tail; + + while ((tx_next = owl_emac_ring_get_next(ring, tx_next)) != ring->head) { + status = READ_ONCE(ring->descs[tx_next].status); + dma_rmb(); /* Ensure data has been read before used. */ + + if (status & OWL_EMAC_BIT_TDES0_OWN) + continue; + + netdev_dbg(netdev, "Found uncleared TX desc OWN bit\n"); + + status = READ_ONCE(ring->descs[ring->tail].status); + dma_rmb(); /* Ensure data has been read before used. */ + status &= ~OWL_EMAC_BIT_TDES0_OWN; + WRITE_ONCE(ring->descs[ring->tail].status, status); + + owl_emac_tx_complete_tail(priv); + break; + } + } + + spin_unlock(&priv->lock); +} + +static int owl_emac_rx_process(struct owl_emac_priv *priv, int budget) +{ + struct owl_emac_ring *ring = &priv->rx_ring; + struct device *dev = owl_emac_get_dev(priv); + struct net_device *netdev = priv->netdev; + struct owl_emac_ring_desc *desc; + struct sk_buff *curr_skb, *new_skb; + dma_addr_t curr_dma, new_dma; + unsigned int rx_tail, len; + u32 status; + int recv = 0; + + while (recv < budget) { + spin_lock(&priv->lock); + + rx_tail = ring->tail; + desc = &ring->descs[rx_tail]; + + status = READ_ONCE(desc->status); + dma_rmb(); /* Ensure data has been read before used. */ + + if (status & OWL_EMAC_BIT_RDES0_OWN) { + spin_unlock(&priv->lock); + break; + } + + curr_skb = ring->skbs[rx_tail]; + curr_dma = ring->skbs_dma[rx_tail]; + owl_emac_ring_pop_tail(ring); + + spin_unlock(&priv->lock); + + if (status & (OWL_EMAC_BIT_RDES0_DE | OWL_EMAC_BIT_RDES0_RF | + OWL_EMAC_BIT_RDES0_TL | OWL_EMAC_BIT_RDES0_CS | + OWL_EMAC_BIT_RDES0_DB | OWL_EMAC_BIT_RDES0_CE | + OWL_EMAC_BIT_RDES0_ZERO)) { + dev_dbg_ratelimited(&netdev->dev, + "RX desc error status: 0x%08x\n", + status); + + if (status & OWL_EMAC_BIT_RDES0_DE) + netdev->stats.rx_over_errors++; + + if (status & (OWL_EMAC_BIT_RDES0_RF | OWL_EMAC_BIT_RDES0_DB)) + netdev->stats.rx_frame_errors++; + + if (status & OWL_EMAC_BIT_RDES0_TL) + netdev->stats.rx_length_errors++; + + if (status & OWL_EMAC_BIT_RDES0_CS) + netdev->stats.collisions++; + + if (status & OWL_EMAC_BIT_RDES0_CE) + netdev->stats.rx_crc_errors++; + + if (status & OWL_EMAC_BIT_RDES0_ZERO) + netdev->stats.rx_fifo_errors++; + + goto drop_skb; + } + + len = (status & OWL_EMAC_MSK_RDES0_FL) >> OWL_EMAC_OFF_RDES0_FL; + if (unlikely(len > OWL_EMAC_RX_FRAME_MAX_LEN)) { + netdev->stats.rx_length_errors++; + netdev_err(netdev, "invalid RX frame len: %u\n", len); + goto drop_skb; + } + + /* Prepare new skb before receiving the current one. */ + new_skb = owl_emac_alloc_skb(netdev); + if (unlikely(!new_skb)) + goto drop_skb; + + new_dma = owl_emac_dma_map_rx(priv, new_skb); + if (dma_mapping_error(dev, new_dma)) { + dev_kfree_skb(new_skb); + netdev_err(netdev, "RX DMA mapping failed\n"); + goto drop_skb; + } + + owl_emac_dma_unmap_rx(priv, curr_skb, curr_dma); + + skb_put(curr_skb, len - ETH_FCS_LEN); + curr_skb->ip_summed = CHECKSUM_NONE; + curr_skb->protocol = eth_type_trans(curr_skb, netdev); + curr_skb->dev = netdev; + + netif_receive_skb(curr_skb); + + netdev->stats.rx_packets++; + netdev->stats.rx_bytes += len; + recv++; + goto push_skb; + +drop_skb: + netdev->stats.rx_dropped++; + netdev->stats.rx_errors++; + /* Reuse the current skb. */ + new_skb = curr_skb; + new_dma = curr_dma; + +push_skb: + spin_lock(&priv->lock); + + ring->skbs[ring->head] = new_skb; + ring->skbs_dma[ring->head] = new_dma; + + WRITE_ONCE(desc->buf_addr, new_dma); + dma_wmb(); /* Flush descriptor before changing ownership. */ + WRITE_ONCE(desc->status, OWL_EMAC_BIT_RDES0_OWN); + + owl_emac_ring_push_head(ring); + + spin_unlock(&priv->lock); + } + + return recv; +} + +static int owl_emac_poll(struct napi_struct *napi, int budget) +{ + int work_done = 0, ru_cnt = 0, recv; + static int tx_err_cnt, rx_err_cnt; + struct owl_emac_priv *priv; + u32 status, proc_status; + + priv = container_of(napi, struct owl_emac_priv, napi); + + while ((status = owl_emac_irq_clear(priv)) & + (OWL_EMAC_BIT_MAC_CSR5_NIS | OWL_EMAC_BIT_MAC_CSR5_AIS)) { + recv = 0; + + /* TX setup frame raises ETI instead of TI. */ + if (status & (OWL_EMAC_BIT_MAC_CSR5_TI | OWL_EMAC_BIT_MAC_CSR5_ETI)) { + owl_emac_tx_complete(priv); + tx_err_cnt = 0; + + /* Count MAC internal RX errors. */ + proc_status = status & OWL_EMAC_MSK_MAC_CSR5_RS; + proc_status >>= OWL_EMAC_OFF_MAC_CSR5_RS; + if (proc_status == OWL_EMAC_VAL_MAC_CSR5_RS_DATA || + proc_status == OWL_EMAC_VAL_MAC_CSR5_RS_CDES || + proc_status == OWL_EMAC_VAL_MAC_CSR5_RS_FDES) + rx_err_cnt++; + } + + if (status & OWL_EMAC_BIT_MAC_CSR5_RI) { + recv = owl_emac_rx_process(priv, budget - work_done); + rx_err_cnt = 0; + + /* Count MAC internal TX errors. */ + proc_status = status & OWL_EMAC_MSK_MAC_CSR5_TS; + proc_status >>= OWL_EMAC_OFF_MAC_CSR5_TS; + if (proc_status == OWL_EMAC_VAL_MAC_CSR5_TS_DATA || + proc_status == OWL_EMAC_VAL_MAC_CSR5_TS_CDES) + tx_err_cnt++; + } else if (status & OWL_EMAC_BIT_MAC_CSR5_RU) { + /* MAC AHB is in suspended state, will return to RX + * descriptor processing when the host changes ownership + * of the descriptor and either an RX poll demand CMD is + * issued or a new frame is recognized by the MAC AHB. + */ + if (++ru_cnt == 2) + owl_emac_dma_cmd_resume_rx(priv); + + recv = owl_emac_rx_process(priv, budget - work_done); + + /* Guard against too many RU interrupts. */ + if (ru_cnt > 3) + break; + } + + work_done += recv; + if (work_done >= budget) + break; + } + + if (work_done < budget) { + napi_complete_done(napi, work_done); + owl_emac_irq_enable(priv); + } + + /* Reset MAC when getting too many internal TX or RX errors. */ + if (tx_err_cnt > 10 || rx_err_cnt > 10) { + netdev_dbg(priv->netdev, "%s error status: 0x%08x\n", + tx_err_cnt > 10 ? "TX" : "RX", status); + rx_err_cnt = 0; + tx_err_cnt = 0; + schedule_work(&priv->mac_reset_task); + } + + return work_done; +} + +static void owl_emac_mdio_clock_enable(struct owl_emac_priv *priv) +{ + u32 val; + + /* Enable MDC clock generation by adjusting CLKDIV according to + * the vendor implementation of the original driver. + */ + val = owl_emac_reg_read(priv, OWL_EMAC_REG_MAC_CSR10); + val &= OWL_EMAC_MSK_MAC_CSR10_CLKDIV; + val |= OWL_EMAC_VAL_MAC_CSR10_CLKDIV_128 << OWL_EMAC_OFF_MAC_CSR10_CLKDIV; + + val |= OWL_EMAC_BIT_MAC_CSR10_SB; + val |= OWL_EMAC_VAL_MAC_CSR10_OPCODE_CDS << OWL_EMAC_OFF_MAC_CSR10_OPCODE; + owl_emac_reg_write(priv, OWL_EMAC_REG_MAC_CSR10, val); +} + +static void owl_emac_core_hw_reset(struct owl_emac_priv *priv) +{ + /* Trigger hardware reset. */ + reset_control_assert(priv->reset); + usleep_range(10, 20); + reset_control_deassert(priv->reset); + usleep_range(100, 200); +} + +static int owl_emac_core_sw_reset(struct owl_emac_priv *priv) +{ + u32 val; + int ret; + + /* Trigger software reset. */ + owl_emac_reg_set(priv, OWL_EMAC_REG_MAC_CSR0, OWL_EMAC_BIT_MAC_CSR0_SWR); + ret = readl_poll_timeout(priv->base + OWL_EMAC_REG_MAC_CSR0, + val, !(val & OWL_EMAC_BIT_MAC_CSR0_SWR), + OWL_EMAC_POLL_DELAY_USEC, + OWL_EMAC_RESET_POLL_TIMEOUT_USEC); + if (ret) + return ret; + + if (priv->phy_mode == PHY_INTERFACE_MODE_RMII) { + /* Enable RMII and use the 50MHz rmii clk as output to PHY. */ + val = 0; + } else { + /* Enable SMII and use the 125MHz rmii clk as output to PHY. + * Additionally set SMII SYNC delay to 4 half cycle. + */ + val = 0x04 << OWL_EMAC_OFF_MAC_CTRL_SSDC; + val |= OWL_EMAC_BIT_MAC_CTRL_RSIS; + } + owl_emac_reg_write(priv, OWL_EMAC_REG_MAC_CTRL, val); + + /* MDC is disabled after reset. */ + owl_emac_mdio_clock_enable(priv); + + /* Set FIFO pause & restart threshold levels. */ + val = 0x40 << OWL_EMAC_OFF_MAC_CSR19_FPTL; + val |= 0x10 << OWL_EMAC_OFF_MAC_CSR19_FRTL; + owl_emac_reg_write(priv, OWL_EMAC_REG_MAC_CSR19, val); + + /* Set flow control pause quanta time to ~100 ms. */ + val = 0x4FFF << OWL_EMAC_OFF_MAC_CSR18_PQT; + owl_emac_reg_write(priv, OWL_EMAC_REG_MAC_CSR18, val); + + /* Setup interrupt mitigation. */ + val = 7 << OWL_EMAC_OFF_MAC_CSR11_NRP; + val |= 4 << OWL_EMAC_OFF_MAC_CSR11_RT; + owl_emac_reg_write(priv, OWL_EMAC_REG_MAC_CSR11, val); + + /* Set RX/TX rings base addresses. */ + owl_emac_reg_write(priv, OWL_EMAC_REG_MAC_CSR3, + (u32)(priv->rx_ring.descs_dma)); + owl_emac_reg_write(priv, OWL_EMAC_REG_MAC_CSR4, + (u32)(priv->tx_ring.descs_dma)); + + /* Setup initial operation mode. */ + val = OWL_EMAC_VAL_MAC_CSR6_SPEED_100M << OWL_EMAC_OFF_MAC_CSR6_SPEED; + val |= OWL_EMAC_BIT_MAC_CSR6_FD; + owl_emac_reg_update(priv, OWL_EMAC_REG_MAC_CSR6, + OWL_EMAC_MSK_MAC_CSR6_SPEED | + OWL_EMAC_BIT_MAC_CSR6_FD, val); + owl_emac_reg_clear(priv, OWL_EMAC_REG_MAC_CSR6, + OWL_EMAC_BIT_MAC_CSR6_PR | OWL_EMAC_BIT_MAC_CSR6_PM); + + priv->link = 0; + priv->speed = SPEED_UNKNOWN; + priv->duplex = DUPLEX_UNKNOWN; + priv->pause = 0; + priv->mcaddr_list.count = 0; + + return 0; +} + +static int owl_emac_enable(struct net_device *netdev, bool start_phy) +{ + struct owl_emac_priv *priv = netdev_priv(netdev); + int ret; + + owl_emac_dma_cmd_stop(priv); + owl_emac_irq_disable(priv); + owl_emac_irq_clear(priv); + + owl_emac_ring_prepare_tx(priv); + ret = owl_emac_ring_prepare_rx(priv); + if (ret) + goto err_unprep; + + ret = owl_emac_core_sw_reset(priv); + if (ret) { + netdev_err(netdev, "failed to soft reset MAC core: %d\n", ret); + goto err_unprep; + } + + owl_emac_set_hw_mac_addr(netdev); + owl_emac_setup_frame_xmit(priv); + + netdev_reset_queue(netdev); + napi_enable(&priv->napi); + + owl_emac_irq_enable(priv); + owl_emac_dma_cmd_start(priv); + + if (start_phy) + phy_start(netdev->phydev); + + netif_start_queue(netdev); + + return 0; + +err_unprep: + owl_emac_ring_unprepare_rx(priv); + owl_emac_ring_unprepare_tx(priv); + + return ret; +} + +static void owl_emac_disable(struct net_device *netdev, bool stop_phy) +{ + struct owl_emac_priv *priv = netdev_priv(netdev); + + owl_emac_dma_cmd_stop(priv); + owl_emac_irq_disable(priv); + + netif_stop_queue(netdev); + napi_disable(&priv->napi); + + if (stop_phy) + phy_stop(netdev->phydev); + + owl_emac_ring_unprepare_rx(priv); + owl_emac_ring_unprepare_tx(priv); +} + +static int owl_emac_ndo_open(struct net_device *netdev) +{ + return owl_emac_enable(netdev, true); +} + +static int owl_emac_ndo_stop(struct net_device *netdev) +{ + owl_emac_disable(netdev, true); + + return 0; +} + +static void owl_emac_set_multicast(struct net_device *netdev, int count) +{ + struct owl_emac_priv *priv = netdev_priv(netdev); + struct netdev_hw_addr *ha; + int index = 0; + + if (count <= 0) { + priv->mcaddr_list.count = 0; + return; + } + + netdev_for_each_mc_addr(ha, netdev) { + if (!is_multicast_ether_addr(ha->addr)) + continue; + + WARN_ON(index >= OWL_EMAC_MAX_MULTICAST_ADDRS); + ether_addr_copy(priv->mcaddr_list.addrs[index++], ha->addr); + } + + priv->mcaddr_list.count = index; + + owl_emac_setup_frame_xmit(priv); +} + +static void owl_emac_ndo_set_rx_mode(struct net_device *netdev) +{ + struct owl_emac_priv *priv = netdev_priv(netdev); + u32 status, val = 0; + int mcast_count = 0; + + if (netdev->flags & IFF_PROMISC) { + val = OWL_EMAC_BIT_MAC_CSR6_PR; + } else if (netdev->flags & IFF_ALLMULTI) { + val = OWL_EMAC_BIT_MAC_CSR6_PM; + } else if (netdev->flags & IFF_MULTICAST) { + mcast_count = netdev_mc_count(netdev); + + if (mcast_count > OWL_EMAC_MAX_MULTICAST_ADDRS) { + val = OWL_EMAC_BIT_MAC_CSR6_PM; + mcast_count = 0; + } + } + + spin_lock_bh(&priv->lock); + + /* Temporarily stop DMA TX & RX. */ + status = owl_emac_dma_cmd_stop(priv); + + /* Update operation modes. */ + owl_emac_reg_update(priv, OWL_EMAC_REG_MAC_CSR6, + OWL_EMAC_BIT_MAC_CSR6_PR | OWL_EMAC_BIT_MAC_CSR6_PM, + val); + + /* Restore DMA TX & RX status. */ + owl_emac_dma_cmd_set(priv, status); + + spin_unlock_bh(&priv->lock); + + /* Set/reset multicast addr list. */ + owl_emac_set_multicast(netdev, mcast_count); +} + +static int owl_emac_ndo_set_mac_addr(struct net_device *netdev, void *addr) +{ + struct sockaddr *skaddr = addr; + + if (!is_valid_ether_addr(skaddr->sa_data)) + return -EADDRNOTAVAIL; + + if (netif_running(netdev)) + return -EBUSY; + + memcpy(netdev->dev_addr, skaddr->sa_data, netdev->addr_len); + owl_emac_set_hw_mac_addr(netdev); + + return owl_emac_setup_frame_xmit(netdev_priv(netdev)); +} + +static int owl_emac_ndo_do_ioctl(struct net_device *netdev, + struct ifreq *req, int cmd) +{ + if (!netif_running(netdev)) + return -EINVAL; + + return phy_mii_ioctl(netdev->phydev, req, cmd); +} + +static void owl_emac_ndo_tx_timeout(struct net_device *netdev, + unsigned int txqueue) +{ + struct owl_emac_priv *priv = netdev_priv(netdev); + + schedule_work(&priv->mac_reset_task); +} + +static void owl_emac_reset_task(struct work_struct *work) +{ + struct owl_emac_priv *priv; + + priv = container_of(work, struct owl_emac_priv, mac_reset_task); + + netdev_dbg(priv->netdev, "resetting MAC\n"); + owl_emac_disable(priv->netdev, false); + owl_emac_enable(priv->netdev, false); +} + +static struct net_device_stats * +owl_emac_ndo_get_stats(struct net_device *netdev) +{ + /* FIXME: If possible, try to get stats from MAC hardware registers + * instead of tracking them manually in the driver. + */ + + return &netdev->stats; +} + +static const struct net_device_ops owl_emac_netdev_ops = { + .ndo_open = owl_emac_ndo_open, + .ndo_stop = owl_emac_ndo_stop, + .ndo_start_xmit = owl_emac_ndo_start_xmit, + .ndo_set_rx_mode = owl_emac_ndo_set_rx_mode, + .ndo_set_mac_address = owl_emac_ndo_set_mac_addr, + .ndo_validate_addr = eth_validate_addr, + .ndo_do_ioctl = owl_emac_ndo_do_ioctl, + .ndo_tx_timeout = owl_emac_ndo_tx_timeout, + .ndo_get_stats = owl_emac_ndo_get_stats, +}; + +static void owl_emac_ethtool_get_drvinfo(struct net_device *dev, + struct ethtool_drvinfo *info) +{ + strscpy(info->driver, OWL_EMAC_DRVNAME, sizeof(info->driver)); +} + +static u32 owl_emac_ethtool_get_msglevel(struct net_device *netdev) +{ + struct owl_emac_priv *priv = netdev_priv(netdev); + + return priv->msg_enable; +} + +static void owl_emac_ethtool_set_msglevel(struct net_device *ndev, u32 val) +{ + struct owl_emac_priv *priv = netdev_priv(ndev); + + priv->msg_enable = val; +} + +static const struct ethtool_ops owl_emac_ethtool_ops = { + .get_drvinfo = owl_emac_ethtool_get_drvinfo, + .get_link = ethtool_op_get_link, + .get_link_ksettings = phy_ethtool_get_link_ksettings, + .set_link_ksettings = phy_ethtool_set_link_ksettings, + .get_msglevel = owl_emac_ethtool_get_msglevel, + .set_msglevel = owl_emac_ethtool_set_msglevel, +}; + +static int owl_emac_mdio_wait(struct owl_emac_priv *priv) +{ + u32 val; + + /* Wait while data transfer is in progress. */ + return readl_poll_timeout(priv->base + OWL_EMAC_REG_MAC_CSR10, + val, !(val & OWL_EMAC_BIT_MAC_CSR10_SB), + OWL_EMAC_POLL_DELAY_USEC, + OWL_EMAC_MDIO_POLL_TIMEOUT_USEC); +} + +static int owl_emac_mdio_read(struct mii_bus *bus, int addr, int regnum) +{ + struct owl_emac_priv *priv = bus->priv; + u32 data, tmp; + int ret; + + if (regnum & MII_ADDR_C45) + return -EOPNOTSUPP; + + data = OWL_EMAC_BIT_MAC_CSR10_SB; + data |= OWL_EMAC_VAL_MAC_CSR10_OPCODE_RD << OWL_EMAC_OFF_MAC_CSR10_OPCODE; + + tmp = addr << OWL_EMAC_OFF_MAC_CSR10_PHYADD; + data |= tmp & OWL_EMAC_MSK_MAC_CSR10_PHYADD; + + tmp = regnum << OWL_EMAC_OFF_MAC_CSR10_REGADD; + data |= tmp & OWL_EMAC_MSK_MAC_CSR10_REGADD; + + owl_emac_reg_write(priv, OWL_EMAC_REG_MAC_CSR10, data); + + ret = owl_emac_mdio_wait(priv); + if (ret) + return ret; + + data = owl_emac_reg_read(priv, OWL_EMAC_REG_MAC_CSR10); + data &= OWL_EMAC_MSK_MAC_CSR10_DATA; + + return data; +} + +static int +owl_emac_mdio_write(struct mii_bus *bus, int addr, int regnum, u16 val) +{ + struct owl_emac_priv *priv = bus->priv; + u32 data, tmp; + + if (regnum & MII_ADDR_C45) + return -EOPNOTSUPP; + + data = OWL_EMAC_BIT_MAC_CSR10_SB; + data |= OWL_EMAC_VAL_MAC_CSR10_OPCODE_WR << OWL_EMAC_OFF_MAC_CSR10_OPCODE; + + tmp = addr << OWL_EMAC_OFF_MAC_CSR10_PHYADD; + data |= tmp & OWL_EMAC_MSK_MAC_CSR10_PHYADD; + + tmp = regnum << OWL_EMAC_OFF_MAC_CSR10_REGADD; + data |= tmp & OWL_EMAC_MSK_MAC_CSR10_REGADD; + + data |= val & OWL_EMAC_MSK_MAC_CSR10_DATA; + + owl_emac_reg_write(priv, OWL_EMAC_REG_MAC_CSR10, data); + + return owl_emac_mdio_wait(priv); +} + +static int owl_emac_mdio_init(struct net_device *netdev) +{ + struct owl_emac_priv *priv = netdev_priv(netdev); + struct device *dev = owl_emac_get_dev(priv); + struct device_node *mdio_node; + int ret; + + mdio_node = of_get_child_by_name(dev->of_node, "mdio"); + if (!mdio_node) + return -ENODEV; + + if (!of_device_is_available(mdio_node)) { + ret = -ENODEV; + goto err_put_node; + } + + priv->mii = devm_mdiobus_alloc(dev); + if (!priv->mii) { + ret = -ENOMEM; + goto err_put_node; + } + + snprintf(priv->mii->id, MII_BUS_ID_SIZE, "%s", dev_name(dev)); + priv->mii->name = "owl-emac-mdio"; + priv->mii->parent = dev; + priv->mii->read = owl_emac_mdio_read; + priv->mii->write = owl_emac_mdio_write; + priv->mii->phy_mask = ~0; /* Mask out all PHYs from auto probing. */ + priv->mii->priv = priv; + + ret = devm_of_mdiobus_register(dev, priv->mii, mdio_node); + +err_put_node: + of_node_put(mdio_node); + return ret; +} + +static int owl_emac_phy_init(struct net_device *netdev) +{ + struct owl_emac_priv *priv = netdev_priv(netdev); + struct device *dev = owl_emac_get_dev(priv); + struct phy_device *phy; + + phy = of_phy_get_and_connect(netdev, dev->of_node, + owl_emac_adjust_link); + if (!phy) + return -ENODEV; + + phy_set_sym_pause(phy, true, true, true); + + if (netif_msg_link(priv)) + phy_attached_info(phy); + + return 0; +} + +static void owl_emac_get_mac_addr(struct net_device *netdev) +{ + struct device *dev = netdev->dev.parent; + int ret; + + ret = eth_platform_get_mac_address(dev, netdev->dev_addr); + if (!ret && is_valid_ether_addr(netdev->dev_addr)) + return; + + eth_hw_addr_random(netdev); + dev_warn(dev, "using random MAC address %pM\n", netdev->dev_addr); +} + +static __maybe_unused int owl_emac_suspend(struct device *dev) +{ + struct net_device *netdev = dev_get_drvdata(dev); + struct owl_emac_priv *priv = netdev_priv(netdev); + + disable_irq(netdev->irq); + + if (netif_running(netdev)) { + owl_emac_disable(netdev, true); + netif_device_detach(netdev); + } + + clk_bulk_disable_unprepare(OWL_EMAC_NCLKS, priv->clks); + + return 0; +} + +static __maybe_unused int owl_emac_resume(struct device *dev) +{ + struct net_device *netdev = dev_get_drvdata(dev); + struct owl_emac_priv *priv = netdev_priv(netdev); + int ret; + + ret = clk_bulk_prepare_enable(OWL_EMAC_NCLKS, priv->clks); + if (ret) + return ret; + + if (netif_running(netdev)) { + owl_emac_core_hw_reset(priv); + owl_emac_core_sw_reset(priv); + + ret = owl_emac_enable(netdev, true); + if (ret) { + clk_bulk_disable_unprepare(OWL_EMAC_NCLKS, priv->clks); + return ret; + } + + netif_device_attach(netdev); + } + + enable_irq(netdev->irq); + + return 0; +} + +static void owl_emac_clk_disable_unprepare(void *data) +{ + struct owl_emac_priv *priv = data; + + clk_bulk_disable_unprepare(OWL_EMAC_NCLKS, priv->clks); +} + +static int owl_emac_clk_set_rate(struct owl_emac_priv *priv) +{ + struct device *dev = owl_emac_get_dev(priv); + unsigned long rate; + int ret; + + switch (priv->phy_mode) { + case PHY_INTERFACE_MODE_RMII: + rate = 50000000; + break; + + case PHY_INTERFACE_MODE_SMII: + rate = 125000000; + break; + + default: + dev_err(dev, "unsupported phy interface mode %d\n", + priv->phy_mode); + return -EOPNOTSUPP; + } + + ret = clk_set_rate(priv->clks[OWL_EMAC_CLK_RMII].clk, rate); + if (ret) + dev_err(dev, "failed to set RMII clock rate: %d\n", ret); + + return ret; +} + +static int owl_emac_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct net_device *netdev; + struct owl_emac_priv *priv; + int ret, i; + + netdev = devm_alloc_etherdev(dev, sizeof(*priv)); + if (!netdev) + return -ENOMEM; + + platform_set_drvdata(pdev, netdev); + SET_NETDEV_DEV(netdev, dev); + + priv = netdev_priv(netdev); + priv->netdev = netdev; + priv->msg_enable = netif_msg_init(-1, OWL_EMAC_DEFAULT_MSG_ENABLE); + + ret = of_get_phy_mode(dev->of_node, &priv->phy_mode); + if (ret) { + dev_err(dev, "failed to get phy mode: %d\n", ret); + return ret; + } + + spin_lock_init(&priv->lock); + + ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32)); + if (ret) { + dev_err(dev, "unsupported DMA mask\n"); + return ret; + } + + ret = owl_emac_ring_alloc(dev, &priv->rx_ring, OWL_EMAC_RX_RING_SIZE); + if (ret) + return ret; + + ret = owl_emac_ring_alloc(dev, &priv->tx_ring, OWL_EMAC_TX_RING_SIZE); + if (ret) + return ret; + + priv->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(priv->base)) + return PTR_ERR(priv->base); + + netdev->irq = platform_get_irq(pdev, 0); + if (netdev->irq < 0) + return netdev->irq; + + ret = devm_request_irq(dev, netdev->irq, owl_emac_handle_irq, + IRQF_SHARED, netdev->name, netdev); + if (ret) { + dev_err(dev, "failed to request irq: %d\n", netdev->irq); + return ret; + } + + for (i = 0; i < OWL_EMAC_NCLKS; i++) + priv->clks[i].id = owl_emac_clk_names[i]; + + ret = devm_clk_bulk_get(dev, OWL_EMAC_NCLKS, priv->clks); + if (ret) + return ret; + + ret = clk_bulk_prepare_enable(OWL_EMAC_NCLKS, priv->clks); + if (ret) + return ret; + + ret = devm_add_action_or_reset(dev, owl_emac_clk_disable_unprepare, priv); + if (ret) + return ret; + + ret = owl_emac_clk_set_rate(priv); + if (ret) + return ret; + + priv->reset = devm_reset_control_get_exclusive(dev, NULL); + if (IS_ERR(priv->reset)) + return dev_err_probe(dev, PTR_ERR(priv->reset), + "failed to get reset control"); + + owl_emac_get_mac_addr(netdev); + + owl_emac_core_hw_reset(priv); + owl_emac_mdio_clock_enable(priv); + + ret = owl_emac_mdio_init(netdev); + if (ret) { + dev_err(dev, "failed to initialize MDIO bus\n"); + return ret; + } + + ret = owl_emac_phy_init(netdev); + if (ret) { + dev_err(dev, "failed to initialize PHY\n"); + return ret; + } + + INIT_WORK(&priv->mac_reset_task, owl_emac_reset_task); + + netdev->min_mtu = OWL_EMAC_MTU_MIN; + netdev->max_mtu = OWL_EMAC_MTU_MAX; + netdev->watchdog_timeo = OWL_EMAC_TX_TIMEOUT; + netdev->netdev_ops = &owl_emac_netdev_ops; + netdev->ethtool_ops = &owl_emac_ethtool_ops; + netif_napi_add(netdev, &priv->napi, owl_emac_poll, NAPI_POLL_WEIGHT); + + ret = devm_register_netdev(dev, netdev); + if (ret) { + netif_napi_del(&priv->napi); + phy_disconnect(netdev->phydev); + return ret; + } + + return 0; +} + +static int owl_emac_remove(struct platform_device *pdev) +{ + struct owl_emac_priv *priv = platform_get_drvdata(pdev); + + netif_napi_del(&priv->napi); + phy_disconnect(priv->netdev->phydev); + cancel_work_sync(&priv->mac_reset_task); + + return 0; +} + +static const struct of_device_id owl_emac_of_match[] = { + { .compatible = "actions,owl-emac", }, + { } +}; +MODULE_DEVICE_TABLE(of, owl_emac_of_match); + +static SIMPLE_DEV_PM_OPS(owl_emac_pm_ops, + owl_emac_suspend, owl_emac_resume); + +static struct platform_driver owl_emac_driver = { + .driver = { + .name = OWL_EMAC_DRVNAME, + .of_match_table = owl_emac_of_match, + .pm = &owl_emac_pm_ops, + }, + .probe = owl_emac_probe, + .remove = owl_emac_remove, +}; +module_platform_driver(owl_emac_driver); + +MODULE_DESCRIPTION("Actions Semi Owl SoCs Ethernet MAC Driver"); +MODULE_AUTHOR("Actions Semi Inc."); +MODULE_AUTHOR("Cristian Ciocaltea <cristian.ciocaltea@gmail.com>"); +MODULE_LICENSE("GPL"); |