--- /dev/null
+// 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");
--- /dev/null
+/* 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>
+ */
+
+#ifndef __OWL_EMAC_H__
+#define __OWL_EMAC_H__
+
+#define OWL_EMAC_DRVNAME "owl-emac"
+
+#define OWL_EMAC_POLL_DELAY_USEC 5
+#define OWL_EMAC_MDIO_POLL_TIMEOUT_USEC 1000
+#define OWL_EMAC_RESET_POLL_TIMEOUT_USEC 2000
+#define OWL_EMAC_TX_TIMEOUT (2 * HZ)
+
+#define OWL_EMAC_MTU_MIN ETH_MIN_MTU
+#define OWL_EMAC_MTU_MAX ETH_DATA_LEN
+#define OWL_EMAC_RX_FRAME_MAX_LEN (ETH_FRAME_LEN + ETH_FCS_LEN)
+#define OWL_EMAC_SKB_ALIGN 4
+#define OWL_EMAC_SKB_RESERVE 18
+
+#define OWL_EMAC_MAX_MULTICAST_ADDRS 14
+#define OWL_EMAC_SETUP_FRAME_LEN 192
+
+#define OWL_EMAC_RX_RING_SIZE 64
+#define OWL_EMAC_TX_RING_SIZE 32
+
+/* Bus mode register */
+#define OWL_EMAC_REG_MAC_CSR0 0x0000
+#define OWL_EMAC_BIT_MAC_CSR0_SWR BIT(0) /* Software reset */
+
+/* Transmit/receive poll demand registers */
+#define OWL_EMAC_REG_MAC_CSR1 0x0008
+#define OWL_EMAC_VAL_MAC_CSR1_TPD 0x01
+#define OWL_EMAC_REG_MAC_CSR2 0x0010
+#define OWL_EMAC_VAL_MAC_CSR2_RPD 0x01
+
+/* Receive/transmit descriptor list base address registers */
+#define OWL_EMAC_REG_MAC_CSR3 0x0018
+#define OWL_EMAC_REG_MAC_CSR4 0x0020
+
+/* Status register */
+#define OWL_EMAC_REG_MAC_CSR5 0x0028
+#define OWL_EMAC_MSK_MAC_CSR5_TS GENMASK(22, 20) /* Transmit process state */
+#define OWL_EMAC_OFF_MAC_CSR5_TS 20
+#define OWL_EMAC_VAL_MAC_CSR5_TS_DATA 0x03 /* Transferring data HOST -> FIFO */
+#define OWL_EMAC_VAL_MAC_CSR5_TS_CDES 0x07 /* Closing transmit descriptor */
+#define OWL_EMAC_MSK_MAC_CSR5_RS GENMASK(19, 17) /* Receive process state */
+#define OWL_EMAC_OFF_MAC_CSR5_RS 17
+#define OWL_EMAC_VAL_MAC_CSR5_RS_FDES 0x01 /* Fetching receive descriptor */
+#define OWL_EMAC_VAL_MAC_CSR5_RS_CDES 0x05 /* Closing receive descriptor */
+#define OWL_EMAC_VAL_MAC_CSR5_RS_DATA 0x07 /* Transferring data FIFO -> HOST */
+#define OWL_EMAC_BIT_MAC_CSR5_NIS BIT(16) /* Normal interrupt summary */
+#define OWL_EMAC_BIT_MAC_CSR5_AIS BIT(15) /* Abnormal interrupt summary */
+#define OWL_EMAC_BIT_MAC_CSR5_ERI BIT(14) /* Early receive interrupt */
+#define OWL_EMAC_BIT_MAC_CSR5_GTE BIT(11) /* General-purpose timer expiration */
+#define OWL_EMAC_BIT_MAC_CSR5_ETI BIT(10) /* Early transmit interrupt */
+#define OWL_EMAC_BIT_MAC_CSR5_RPS BIT(8) /* Receive process stopped */
+#define OWL_EMAC_BIT_MAC_CSR5_RU BIT(7) /* Receive buffer unavailable */
+#define OWL_EMAC_BIT_MAC_CSR5_RI BIT(6) /* Receive interrupt */
+#define OWL_EMAC_BIT_MAC_CSR5_UNF BIT(5) /* Transmit underflow */
+#define OWL_EMAC_BIT_MAC_CSR5_LCIS BIT(4) /* Link change status */
+#define OWL_EMAC_BIT_MAC_CSR5_LCIQ BIT(3) /* Link change interrupt */
+#define OWL_EMAC_BIT_MAC_CSR5_TU BIT(2) /* Transmit buffer unavailable */
+#define OWL_EMAC_BIT_MAC_CSR5_TPS BIT(1) /* Transmit process stopped */
+#define OWL_EMAC_BIT_MAC_CSR5_TI BIT(0) /* Transmit interrupt */
+
+/* Operation mode register */
+#define OWL_EMAC_REG_MAC_CSR6 0x0030
+#define OWL_EMAC_BIT_MAC_CSR6_RA BIT(30) /* Receive all */
+#define OWL_EMAC_BIT_MAC_CSR6_TTM BIT(22) /* Transmit threshold mode */
+#define OWL_EMAC_BIT_MAC_CSR6_SF BIT(21) /* Store and forward */
+#define OWL_EMAC_MSK_MAC_CSR6_SPEED GENMASK(17, 16) /* Eth speed selection */
+#define OWL_EMAC_OFF_MAC_CSR6_SPEED 16
+#define OWL_EMAC_VAL_MAC_CSR6_SPEED_100M 0x00
+#define OWL_EMAC_VAL_MAC_CSR6_SPEED_10M 0x02
+#define OWL_EMAC_BIT_MAC_CSR6_ST BIT(13) /* Start/stop transmit command */
+#define OWL_EMAC_BIT_MAC_CSR6_LP BIT(10) /* Loopback mode */
+#define OWL_EMAC_BIT_MAC_CSR6_FD BIT(9) /* Full duplex mode */
+#define OWL_EMAC_BIT_MAC_CSR6_PM BIT(7) /* Pass all multicast */
+#define OWL_EMAC_BIT_MAC_CSR6_PR BIT(6) /* Promiscuous mode */
+#define OWL_EMAC_BIT_MAC_CSR6_IF BIT(4) /* Inverse filtering */
+#define OWL_EMAC_BIT_MAC_CSR6_PB BIT(3) /* Pass bad frames */
+#define OWL_EMAC_BIT_MAC_CSR6_HO BIT(2) /* Hash only filtering mode */
+#define OWL_EMAC_BIT_MAC_CSR6_SR BIT(1) /* Start/stop receive command */
+#define OWL_EMAC_BIT_MAC_CSR6_HP BIT(0) /* Hash/perfect receive filtering mode */
+#define OWL_EMAC_MSK_MAC_CSR6_STSR (OWL_EMAC_BIT_MAC_CSR6_ST | \
+ OWL_EMAC_BIT_MAC_CSR6_SR)
+
+/* Interrupt enable register */
+#define OWL_EMAC_REG_MAC_CSR7 0x0038
+#define OWL_EMAC_BIT_MAC_CSR7_NIE BIT(16) /* Normal interrupt summary enable */
+#define OWL_EMAC_BIT_MAC_CSR7_AIE BIT(15) /* Abnormal interrupt summary enable */
+#define OWL_EMAC_BIT_MAC_CSR7_ERE BIT(14) /* Early receive interrupt enable */
+#define OWL_EMAC_BIT_MAC_CSR7_GTE BIT(11) /* General-purpose timer overflow */
+#define OWL_EMAC_BIT_MAC_CSR7_ETE BIT(10) /* Early transmit interrupt enable */
+#define OWL_EMAC_BIT_MAC_CSR7_RSE BIT(8) /* Receive stopped enable */
+#define OWL_EMAC_BIT_MAC_CSR7_RUE BIT(7) /* Receive buffer unavailable enable */
+#define OWL_EMAC_BIT_MAC_CSR7_RIE BIT(6) /* Receive interrupt enable */
+#define OWL_EMAC_BIT_MAC_CSR7_UNE BIT(5) /* Underflow interrupt enable */
+#define OWL_EMAC_BIT_MAC_CSR7_TUE BIT(2) /* Transmit buffer unavailable enable */
+#define OWL_EMAC_BIT_MAC_CSR7_TSE BIT(1) /* Transmit stopped enable */
+#define OWL_EMAC_BIT_MAC_CSR7_TIE BIT(0) /* Transmit interrupt enable */
+#define OWL_EMAC_BIT_MAC_CSR7_ALL_NOT_TUE (OWL_EMAC_BIT_MAC_CSR7_ERE | \
+ OWL_EMAC_BIT_MAC_CSR7_GTE | \
+ OWL_EMAC_BIT_MAC_CSR7_ETE | \
+ OWL_EMAC_BIT_MAC_CSR7_RSE | \
+ OWL_EMAC_BIT_MAC_CSR7_RUE | \
+ OWL_EMAC_BIT_MAC_CSR7_RIE | \
+ OWL_EMAC_BIT_MAC_CSR7_UNE | \
+ OWL_EMAC_BIT_MAC_CSR7_TSE | \
+ OWL_EMAC_BIT_MAC_CSR7_TIE)
+
+/* Missed frames and overflow counter register */
+#define OWL_EMAC_REG_MAC_CSR8 0x0040
+/* MII management and serial ROM register */
+#define OWL_EMAC_REG_MAC_CSR9 0x0048
+
+/* MII serial management register */
+#define OWL_EMAC_REG_MAC_CSR10 0x0050
+#define OWL_EMAC_BIT_MAC_CSR10_SB BIT(31) /* Start transfer or busy */
+#define OWL_EMAC_MSK_MAC_CSR10_CLKDIV GENMASK(30, 28) /* Clock divider */
+#define OWL_EMAC_OFF_MAC_CSR10_CLKDIV 28
+#define OWL_EMAC_VAL_MAC_CSR10_CLKDIV_128 0x04
+#define OWL_EMAC_VAL_MAC_CSR10_OPCODE_WR 0x01 /* Register write command */
+#define OWL_EMAC_OFF_MAC_CSR10_OPCODE 26 /* Operation mode */
+#define OWL_EMAC_VAL_MAC_CSR10_OPCODE_DCG 0x00 /* Disable clock generation */
+#define OWL_EMAC_VAL_MAC_CSR10_OPCODE_WR 0x01 /* Register write command */
+#define OWL_EMAC_VAL_MAC_CSR10_OPCODE_RD 0x02 /* Register read command */
+#define OWL_EMAC_VAL_MAC_CSR10_OPCODE_CDS 0x03 /* Clock divider set */
+#define OWL_EMAC_MSK_MAC_CSR10_PHYADD GENMASK(25, 21) /* Physical layer address */
+#define OWL_EMAC_OFF_MAC_CSR10_PHYADD 21
+#define OWL_EMAC_MSK_MAC_CSR10_REGADD GENMASK(20, 16) /* Register address */
+#define OWL_EMAC_OFF_MAC_CSR10_REGADD 16
+#define OWL_EMAC_MSK_MAC_CSR10_DATA GENMASK(15, 0) /* Register data */
+
+/* General-purpose timer and interrupt mitigation control register */
+#define OWL_EMAC_REG_MAC_CSR11 0x0058
+#define OWL_EMAC_OFF_MAC_CSR11_TT 27 /* Transmit timer */
+#define OWL_EMAC_OFF_MAC_CSR11_NTP 24 /* No. of transmit packets */
+#define OWL_EMAC_OFF_MAC_CSR11_RT 20 /* Receive timer */
+#define OWL_EMAC_OFF_MAC_CSR11_NRP 17 /* No. of receive packets */
+
+/* MAC address low/high registers */
+#define OWL_EMAC_REG_MAC_CSR16 0x0080
+#define OWL_EMAC_REG_MAC_CSR17 0x0088
+
+/* Pause time & cache thresholds register */
+#define OWL_EMAC_REG_MAC_CSR18 0x0090
+#define OWL_EMAC_OFF_MAC_CSR18_CPTL 24 /* Cache pause threshold level */
+#define OWL_EMAC_OFF_MAC_CSR18_CRTL 16 /* Cache restart threshold level */
+#define OWL_EMAC_OFF_MAC_CSR18_PQT 0 /* Flow control pause quanta time */
+
+/* FIFO pause & restart threshold register */
+#define OWL_EMAC_REG_MAC_CSR19 0x0098
+#define OWL_EMAC_OFF_MAC_CSR19_FPTL 16 /* FIFO pause threshold level */
+#define OWL_EMAC_OFF_MAC_CSR19_FRTL 0 /* FIFO restart threshold level */
+
+/* Flow control setup & status register */
+#define OWL_EMAC_REG_MAC_CSR20 0x00A0
+#define OWL_EMAC_BIT_MAC_CSR20_FCE BIT(31) /* Flow Control Enable */
+#define OWL_EMAC_BIT_MAC_CSR20_TUE BIT(30) /* Transmit Un-pause frames Enable */
+#define OWL_EMAC_BIT_MAC_CSR20_TPE BIT(29) /* Transmit Pause frames Enable */
+#define OWL_EMAC_BIT_MAC_CSR20_RPE BIT(28) /* Receive Pause frames Enable */
+#define OWL_EMAC_BIT_MAC_CSR20_BPE BIT(27) /* Back pressure (half-duplex) Enable */
+
+/* MII control register */
+#define OWL_EMAC_REG_MAC_CTRL 0x00B0
+#define OWL_EMAC_BIT_MAC_CTRL_RRSB BIT(8) /* RMII_REFCLK select bit */
+#define OWL_EMAC_OFF_MAC_CTRL_SSDC 4 /* SMII SYNC delay cycle */
+#define OWL_EMAC_BIT_MAC_CTRL_RCPS BIT(1) /* REF_CLK phase select */
+#define OWL_EMAC_BIT_MAC_CTRL_RSIS BIT(0) /* RMII/SMII interface select */
+
+/* Receive descriptor status field */
+#define OWL_EMAC_BIT_RDES0_OWN BIT(31) /* Ownership bit */
+#define OWL_EMAC_BIT_RDES0_FF BIT(30) /* Filtering fail */
+#define OWL_EMAC_MSK_RDES0_FL GENMASK(29, 16) /* Frame length */
+#define OWL_EMAC_OFF_RDES0_FL 16
+#define OWL_EMAC_BIT_RDES0_ES BIT(15) /* Error summary */
+#define OWL_EMAC_BIT_RDES0_DE BIT(14) /* Descriptor error */
+#define OWL_EMAC_BIT_RDES0_RF BIT(11) /* Runt frame */
+#define OWL_EMAC_BIT_RDES0_MF BIT(10) /* Multicast frame */
+#define OWL_EMAC_BIT_RDES0_FS BIT(9) /* First descriptor */
+#define OWL_EMAC_BIT_RDES0_LS BIT(8) /* Last descriptor */
+#define OWL_EMAC_BIT_RDES0_TL BIT(7) /* Frame too long */
+#define OWL_EMAC_BIT_RDES0_CS BIT(6) /* Collision seen */
+#define OWL_EMAC_BIT_RDES0_FT BIT(5) /* Frame type */
+#define OWL_EMAC_BIT_RDES0_RE BIT(3) /* Report on MII error */
+#define OWL_EMAC_BIT_RDES0_DB BIT(2) /* Dribbling bit */
+#define OWL_EMAC_BIT_RDES0_CE BIT(1) /* CRC error */
+#define OWL_EMAC_BIT_RDES0_ZERO BIT(0) /* Legal frame length indicator */
+
+/* Receive descriptor control and count field */
+#define OWL_EMAC_BIT_RDES1_RER BIT(25) /* Receive end of ring */
+#define OWL_EMAC_MSK_RDES1_RBS1 GENMASK(10, 0) /* Buffer 1 size */
+
+/* Transmit descriptor status field */
+#define OWL_EMAC_BIT_TDES0_OWN BIT(31) /* Ownership bit */
+#define OWL_EMAC_BIT_TDES0_ES BIT(15) /* Error summary */
+#define OWL_EMAC_BIT_TDES0_LO BIT(11) /* Loss of carrier */
+#define OWL_EMAC_BIT_TDES0_NC BIT(10) /* No carrier */
+#define OWL_EMAC_BIT_TDES0_LC BIT(9) /* Late collision */
+#define OWL_EMAC_BIT_TDES0_EC BIT(8) /* Excessive collisions */
+#define OWL_EMAC_MSK_TDES0_CC GENMASK(6, 3) /* Collision count */
+#define OWL_EMAC_BIT_TDES0_UF BIT(1) /* Underflow error */
+#define OWL_EMAC_BIT_TDES0_DE BIT(0) /* Deferred */
+
+/* Transmit descriptor control and count field */
+#define OWL_EMAC_BIT_TDES1_IC BIT(31) /* Interrupt on completion */
+#define OWL_EMAC_BIT_TDES1_LS BIT(30) /* Last descriptor */
+#define OWL_EMAC_BIT_TDES1_FS BIT(29) /* First descriptor */
+#define OWL_EMAC_BIT_TDES1_FT1 BIT(28) /* Filtering type */
+#define OWL_EMAC_BIT_TDES1_SET BIT(27) /* Setup packet */
+#define OWL_EMAC_BIT_TDES1_AC BIT(26) /* Add CRC disable */
+#define OWL_EMAC_BIT_TDES1_TER BIT(25) /* Transmit end of ring */
+#define OWL_EMAC_BIT_TDES1_DPD BIT(23) /* Disabled padding */
+#define OWL_EMAC_BIT_TDES1_FT0 BIT(22) /* Filtering type */
+#define OWL_EMAC_MSK_TDES1_TBS1 GENMASK(10, 0) /* Buffer 1 size */
+
+static const char *const owl_emac_clk_names[] = { "eth", "rmii" };
+#define OWL_EMAC_NCLKS ARRAY_SIZE(owl_emac_clk_names)
+
+enum owl_emac_clk_map {
+ OWL_EMAC_CLK_ETH = 0,
+ OWL_EMAC_CLK_RMII
+};
+
+struct owl_emac_addr_list {
+ u8 addrs[OWL_EMAC_MAX_MULTICAST_ADDRS][ETH_ALEN];
+ int count;
+};
+
+/* TX/RX descriptors */
+struct owl_emac_ring_desc {
+ u32 status;
+ u32 control;
+ u32 buf_addr;
+ u32 reserved; /* 2nd buffer address is not used */
+};
+
+struct owl_emac_ring {
+ struct owl_emac_ring_desc *descs;
+ dma_addr_t descs_dma;
+ struct sk_buff **skbs;
+ dma_addr_t *skbs_dma;
+ unsigned int size;
+ unsigned int head;
+ unsigned int tail;
+};
+
+struct owl_emac_priv {
+ struct net_device *netdev;
+ void __iomem *base;
+
+ struct clk_bulk_data clks[OWL_EMAC_NCLKS];
+ struct reset_control *reset;
+
+ struct owl_emac_ring rx_ring;
+ struct owl_emac_ring tx_ring;
+
+ struct mii_bus *mii;
+ struct napi_struct napi;
+
+ phy_interface_t phy_mode;
+ unsigned int link;
+ int speed;
+ int duplex;
+ int pause;
+ struct owl_emac_addr_list mcaddr_list;
+
+ struct work_struct mac_reset_task;
+
+ u32 msg_enable; /* Debug message level */
+ spinlock_t lock; /* Sync concurrent ring access */
+};
+
+#endif /* __OWL_EMAC_H__ */
projects / platform / kernel / linux-rpi.git / commitdiff