diff options
Diffstat (limited to 'drivers/net/ethernet/aurora/nb8800.c')
| -rw-r--r-- | drivers/net/ethernet/aurora/nb8800.c | 1520 |
1 files changed, 0 insertions, 1520 deletions
diff --git a/drivers/net/ethernet/aurora/nb8800.c b/drivers/net/ethernet/aurora/nb8800.c deleted file mode 100644 index 5b20185cbd62..000000000000 --- a/drivers/net/ethernet/aurora/nb8800.c +++ /dev/null @@ -1,1520 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-or-later -/* - * Copyright (C) 2015 Mans Rullgard <mans@mansr.com> - * - * Mostly rewritten, based on driver from Sigma Designs. Original - * copyright notice below. - * - * Driver for tangox SMP864x/SMP865x/SMP867x/SMP868x builtin Ethernet Mac. - * - * Copyright (C) 2005 Maxime Bizon <mbizon@freebox.fr> - */ - -#include <linux/module.h> -#include <linux/etherdevice.h> -#include <linux/delay.h> -#include <linux/ethtool.h> -#include <linux/interrupt.h> -#include <linux/platform_device.h> -#include <linux/of_device.h> -#include <linux/of_mdio.h> -#include <linux/of_net.h> -#include <linux/dma-mapping.h> -#include <linux/phy.h> -#include <linux/cache.h> -#include <linux/jiffies.h> -#include <linux/io.h> -#include <linux/iopoll.h> -#include <asm/barrier.h> - -#include "nb8800.h" - -static void nb8800_tx_done(struct net_device *dev); -static int nb8800_dma_stop(struct net_device *dev); - -static inline u8 nb8800_readb(struct nb8800_priv *priv, int reg) -{ - return readb_relaxed(priv->base + reg); -} - -static inline u32 nb8800_readl(struct nb8800_priv *priv, int reg) -{ - return readl_relaxed(priv->base + reg); -} - -static inline void nb8800_writeb(struct nb8800_priv *priv, int reg, u8 val) -{ - writeb_relaxed(val, priv->base + reg); -} - -static inline void nb8800_writew(struct nb8800_priv *priv, int reg, u16 val) -{ - writew_relaxed(val, priv->base + reg); -} - -static inline void nb8800_writel(struct nb8800_priv *priv, int reg, u32 val) -{ - writel_relaxed(val, priv->base + reg); -} - -static inline void nb8800_maskb(struct nb8800_priv *priv, int reg, - u32 mask, u32 val) -{ - u32 old = nb8800_readb(priv, reg); - u32 new = (old & ~mask) | (val & mask); - - if (new != old) - nb8800_writeb(priv, reg, new); -} - -static inline void nb8800_maskl(struct nb8800_priv *priv, int reg, - u32 mask, u32 val) -{ - u32 old = nb8800_readl(priv, reg); - u32 new = (old & ~mask) | (val & mask); - - if (new != old) - nb8800_writel(priv, reg, new); -} - -static inline void nb8800_modb(struct nb8800_priv *priv, int reg, u8 bits, - bool set) -{ - nb8800_maskb(priv, reg, bits, set ? bits : 0); -} - -static inline void nb8800_setb(struct nb8800_priv *priv, int reg, u8 bits) -{ - nb8800_maskb(priv, reg, bits, bits); -} - -static inline void nb8800_clearb(struct nb8800_priv *priv, int reg, u8 bits) -{ - nb8800_maskb(priv, reg, bits, 0); -} - -static inline void nb8800_modl(struct nb8800_priv *priv, int reg, u32 bits, - bool set) -{ - nb8800_maskl(priv, reg, bits, set ? bits : 0); -} - -static inline void nb8800_setl(struct nb8800_priv *priv, int reg, u32 bits) -{ - nb8800_maskl(priv, reg, bits, bits); -} - -static inline void nb8800_clearl(struct nb8800_priv *priv, int reg, u32 bits) -{ - nb8800_maskl(priv, reg, bits, 0); -} - -static int nb8800_mdio_wait(struct mii_bus *bus) -{ - struct nb8800_priv *priv = bus->priv; - u32 val; - - return readl_poll_timeout_atomic(priv->base + NB8800_MDIO_CMD, - val, !(val & MDIO_CMD_GO), 1, 1000); -} - -static int nb8800_mdio_cmd(struct mii_bus *bus, u32 cmd) -{ - struct nb8800_priv *priv = bus->priv; - int err; - - err = nb8800_mdio_wait(bus); - if (err) - return err; - - nb8800_writel(priv, NB8800_MDIO_CMD, cmd); - udelay(10); - nb8800_writel(priv, NB8800_MDIO_CMD, cmd | MDIO_CMD_GO); - - return nb8800_mdio_wait(bus); -} - -static int nb8800_mdio_read(struct mii_bus *bus, int phy_id, int reg) -{ - struct nb8800_priv *priv = bus->priv; - u32 val; - int err; - - err = nb8800_mdio_cmd(bus, MDIO_CMD_ADDR(phy_id) | MDIO_CMD_REG(reg)); - if (err) - return err; - - val = nb8800_readl(priv, NB8800_MDIO_STS); - if (val & MDIO_STS_ERR) - return 0xffff; - - return val & 0xffff; -} - -static int nb8800_mdio_write(struct mii_bus *bus, int phy_id, int reg, u16 val) -{ - u32 cmd = MDIO_CMD_ADDR(phy_id) | MDIO_CMD_REG(reg) | - MDIO_CMD_DATA(val) | MDIO_CMD_WR; - - return nb8800_mdio_cmd(bus, cmd); -} - -static void nb8800_mac_tx(struct net_device *dev, bool enable) -{ - struct nb8800_priv *priv = netdev_priv(dev); - - while (nb8800_readl(priv, NB8800_TXC_CR) & TCR_EN) - cpu_relax(); - - nb8800_modb(priv, NB8800_TX_CTL1, TX_EN, enable); -} - -static void nb8800_mac_rx(struct net_device *dev, bool enable) -{ - nb8800_modb(netdev_priv(dev), NB8800_RX_CTL, RX_EN, enable); -} - -static void nb8800_mac_af(struct net_device *dev, bool enable) -{ - nb8800_modb(netdev_priv(dev), NB8800_RX_CTL, RX_AF_EN, enable); -} - -static void nb8800_start_rx(struct net_device *dev) -{ - nb8800_setl(netdev_priv(dev), NB8800_RXC_CR, RCR_EN); -} - -static int nb8800_alloc_rx(struct net_device *dev, unsigned int i, bool napi) -{ - struct nb8800_priv *priv = netdev_priv(dev); - struct nb8800_rx_desc *rxd = &priv->rx_descs[i]; - struct nb8800_rx_buf *rxb = &priv->rx_bufs[i]; - int size = L1_CACHE_ALIGN(RX_BUF_SIZE); - dma_addr_t dma_addr; - struct page *page; - unsigned long offset; - void *data; - - data = napi ? napi_alloc_frag(size) : netdev_alloc_frag(size); - if (!data) - return -ENOMEM; - - page = virt_to_head_page(data); - offset = data - page_address(page); - - dma_addr = dma_map_page(&dev->dev, page, offset, RX_BUF_SIZE, - DMA_FROM_DEVICE); - - if (dma_mapping_error(&dev->dev, dma_addr)) { - skb_free_frag(data); - return -ENOMEM; - } - - rxb->page = page; - rxb->offset = offset; - rxd->desc.s_addr = dma_addr; - - return 0; -} - -static void nb8800_receive(struct net_device *dev, unsigned int i, - unsigned int len) -{ - struct nb8800_priv *priv = netdev_priv(dev); - struct nb8800_rx_desc *rxd = &priv->rx_descs[i]; - struct page *page = priv->rx_bufs[i].page; - int offset = priv->rx_bufs[i].offset; - void *data = page_address(page) + offset; - dma_addr_t dma = rxd->desc.s_addr; - struct sk_buff *skb; - unsigned int size; - int err; - - size = len <= RX_COPYBREAK ? len : RX_COPYHDR; - - skb = napi_alloc_skb(&priv->napi, size); - if (!skb) { - netdev_err(dev, "rx skb allocation failed\n"); - dev->stats.rx_dropped++; - return; - } - - if (len <= RX_COPYBREAK) { - dma_sync_single_for_cpu(&dev->dev, dma, len, DMA_FROM_DEVICE); - skb_put_data(skb, data, len); - dma_sync_single_for_device(&dev->dev, dma, len, - DMA_FROM_DEVICE); - } else { - err = nb8800_alloc_rx(dev, i, true); - if (err) { - netdev_err(dev, "rx buffer allocation failed\n"); - dev->stats.rx_dropped++; - dev_kfree_skb(skb); - return; - } - - dma_unmap_page(&dev->dev, dma, RX_BUF_SIZE, DMA_FROM_DEVICE); - skb_put_data(skb, data, RX_COPYHDR); - skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, - offset + RX_COPYHDR, len - RX_COPYHDR, - RX_BUF_SIZE); - } - - skb->protocol = eth_type_trans(skb, dev); - napi_gro_receive(&priv->napi, skb); -} - -static void nb8800_rx_error(struct net_device *dev, u32 report) -{ - if (report & RX_LENGTH_ERR) - dev->stats.rx_length_errors++; - - if (report & RX_FCS_ERR) - dev->stats.rx_crc_errors++; - - if (report & RX_FIFO_OVERRUN) - dev->stats.rx_fifo_errors++; - - if (report & RX_ALIGNMENT_ERROR) - dev->stats.rx_frame_errors++; - - dev->stats.rx_errors++; -} - -static int nb8800_poll(struct napi_struct *napi, int budget) -{ - struct net_device *dev = napi->dev; - struct nb8800_priv *priv = netdev_priv(dev); - struct nb8800_rx_desc *rxd; - unsigned int last = priv->rx_eoc; - unsigned int next; - int work = 0; - - nb8800_tx_done(dev); - -again: - do { - unsigned int len; - - next = (last + 1) % RX_DESC_COUNT; - - rxd = &priv->rx_descs[next]; - - if (!rxd->report) - break; - - len = RX_BYTES_TRANSFERRED(rxd->report); - - if (IS_RX_ERROR(rxd->report)) - nb8800_rx_error(dev, rxd->report); - else - nb8800_receive(dev, next, len); - - dev->stats.rx_packets++; - dev->stats.rx_bytes += len; - - if (rxd->report & RX_MULTICAST_PKT) - dev->stats.multicast++; - - rxd->report = 0; - last = next; - work++; - } while (work < budget); - - if (work) { - priv->rx_descs[last].desc.config |= DESC_EOC; - wmb(); /* ensure new EOC is written before clearing old */ - priv->rx_descs[priv->rx_eoc].desc.config &= ~DESC_EOC; - priv->rx_eoc = last; - nb8800_start_rx(dev); - } - - if (work < budget) { - nb8800_writel(priv, NB8800_RX_ITR, priv->rx_itr_irq); - - /* If a packet arrived after we last checked but - * before writing RX_ITR, the interrupt will be - * delayed, so we retrieve it now. - */ - if (priv->rx_descs[next].report) - goto again; - - napi_complete_done(napi, work); - } - - return work; -} - -static void __nb8800_tx_dma_start(struct net_device *dev) -{ - struct nb8800_priv *priv = netdev_priv(dev); - struct nb8800_tx_buf *txb; - u32 txc_cr; - - txb = &priv->tx_bufs[priv->tx_queue]; - if (!txb->ready) - return; - - txc_cr = nb8800_readl(priv, NB8800_TXC_CR); - if (txc_cr & TCR_EN) - return; - - nb8800_writel(priv, NB8800_TX_DESC_ADDR, txb->dma_desc); - wmb(); /* ensure desc addr is written before starting DMA */ - nb8800_writel(priv, NB8800_TXC_CR, txc_cr | TCR_EN); - - priv->tx_queue = (priv->tx_queue + txb->chain_len) % TX_DESC_COUNT; -} - -static void nb8800_tx_dma_start(struct net_device *dev) -{ - struct nb8800_priv *priv = netdev_priv(dev); - - spin_lock_irq(&priv->tx_lock); - __nb8800_tx_dma_start(dev); - spin_unlock_irq(&priv->tx_lock); -} - -static void nb8800_tx_dma_start_irq(struct net_device *dev) -{ - struct nb8800_priv *priv = netdev_priv(dev); - - spin_lock(&priv->tx_lock); - __nb8800_tx_dma_start(dev); - spin_unlock(&priv->tx_lock); -} - -static netdev_tx_t nb8800_xmit(struct sk_buff *skb, struct net_device *dev) -{ - struct nb8800_priv *priv = netdev_priv(dev); - struct nb8800_tx_desc *txd; - struct nb8800_tx_buf *txb; - struct nb8800_dma_desc *desc; - dma_addr_t dma_addr; - unsigned int dma_len; - unsigned int align; - unsigned int next; - bool xmit_more; - - if (atomic_read(&priv->tx_free) <= NB8800_DESC_LOW) { - netif_stop_queue(dev); - return NETDEV_TX_BUSY; - } - - align = (8 - (uintptr_t)skb->data) & 7; - - dma_len = skb->len - align; - dma_addr = dma_map_single(&dev->dev, skb->data + align, - dma_len, DMA_TO_DEVICE); - - if (dma_mapping_error(&dev->dev, dma_addr)) { - netdev_err(dev, "tx dma mapping error\n"); - kfree_skb(skb); - dev->stats.tx_dropped++; - return NETDEV_TX_OK; - } - - xmit_more = netdev_xmit_more(); - if (atomic_dec_return(&priv->tx_free) <= NB8800_DESC_LOW) { - netif_stop_queue(dev); - xmit_more = false; - } - - next = priv->tx_next; - txb = &priv->tx_bufs[next]; - txd = &priv->tx_descs[next]; - desc = &txd->desc[0]; - - next = (next + 1) % TX_DESC_COUNT; - - if (align) { - memcpy(txd->buf, skb->data, align); - - desc->s_addr = - txb->dma_desc + offsetof(struct nb8800_tx_desc, buf); - desc->n_addr = txb->dma_desc + sizeof(txd->desc[0]); - desc->config = DESC_BTS(2) | DESC_DS | align; - - desc++; - } - - desc->s_addr = dma_addr; - desc->n_addr = priv->tx_bufs[next].dma_desc; - desc->config = DESC_BTS(2) | DESC_DS | DESC_EOF | dma_len; - - if (!xmit_more) - desc->config |= DESC_EOC; - - txb->skb = skb; - txb->dma_addr = dma_addr; - txb->dma_len = dma_len; - - if (!priv->tx_chain) { - txb->chain_len = 1; - priv->tx_chain = txb; - } else { - priv->tx_chain->chain_len++; - } - - netdev_sent_queue(dev, skb->len); - - priv->tx_next = next; - - if (!xmit_more) { - smp_wmb(); - priv->tx_chain->ready = true; - priv->tx_chain = NULL; - nb8800_tx_dma_start(dev); - } - - return NETDEV_TX_OK; -} - -static void nb8800_tx_error(struct net_device *dev, u32 report) -{ - if (report & TX_LATE_COLLISION) - dev->stats.collisions++; - - if (report & TX_PACKET_DROPPED) - dev->stats.tx_dropped++; - - if (report & TX_FIFO_UNDERRUN) - dev->stats.tx_fifo_errors++; - - dev->stats.tx_errors++; -} - -static void nb8800_tx_done(struct net_device *dev) -{ - struct nb8800_priv *priv = netdev_priv(dev); - unsigned int limit = priv->tx_next; - unsigned int done = priv->tx_done; - unsigned int packets = 0; - unsigned int len = 0; - - while (done != limit) { - struct nb8800_tx_desc *txd = &priv->tx_descs[done]; - struct nb8800_tx_buf *txb = &priv->tx_bufs[done]; - struct sk_buff *skb; - - if (!txd->report) - break; - - skb = txb->skb; - len += skb->len; - - dma_unmap_single(&dev->dev, txb->dma_addr, txb->dma_len, - DMA_TO_DEVICE); - - if (IS_TX_ERROR(txd->report)) { - nb8800_tx_error(dev, txd->report); - kfree_skb(skb); - } else { - consume_skb(skb); - } - - dev->stats.tx_packets++; - dev->stats.tx_bytes += TX_BYTES_TRANSFERRED(txd->report); - dev->stats.collisions += TX_EARLY_COLLISIONS(txd->report); - - txb->skb = NULL; - txb->ready = false; - txd->report = 0; - - done = (done + 1) % TX_DESC_COUNT; - packets++; - } - - if (packets) { - smp_mb__before_atomic(); - atomic_add(packets, &priv->tx_free); - netdev_completed_queue(dev, packets, len); - netif_wake_queue(dev); - priv->tx_done = done; - } -} - -static irqreturn_t nb8800_irq(int irq, void *dev_id) -{ - struct net_device *dev = dev_id; - struct nb8800_priv *priv = netdev_priv(dev); - irqreturn_t ret = IRQ_NONE; - u32 val; - - /* tx interrupt */ - val = nb8800_readl(priv, NB8800_TXC_SR); - if (val) { - nb8800_writel(priv, NB8800_TXC_SR, val); - - if (val & TSR_DI) - nb8800_tx_dma_start_irq(dev); - - if (val & TSR_TI) - napi_schedule_irqoff(&priv->napi); - - if (unlikely(val & TSR_DE)) - netdev_err(dev, "TX DMA error\n"); - - /* should never happen with automatic status retrieval */ - if (unlikely(val & TSR_TO)) - netdev_err(dev, "TX Status FIFO overflow\n"); - - ret = IRQ_HANDLED; - } - - /* rx interrupt */ - val = nb8800_readl(priv, NB8800_RXC_SR); - if (val) { - nb8800_writel(priv, NB8800_RXC_SR, val); - - if (likely(val & (RSR_RI | RSR_DI))) { - nb8800_writel(priv, NB8800_RX_ITR, priv->rx_itr_poll); - napi_schedule_irqoff(&priv->napi); - } - - if (unlikely(val & RSR_DE)) - netdev_err(dev, "RX DMA error\n"); - - /* should never happen with automatic status retrieval */ - if (unlikely(val & RSR_RO)) - netdev_err(dev, "RX Status FIFO overflow\n"); - - ret = IRQ_HANDLED; - } - - return ret; -} - -static void nb8800_mac_config(struct net_device *dev) -{ - struct nb8800_priv *priv = netdev_priv(dev); - bool gigabit = priv->speed == SPEED_1000; - u32 mac_mode_mask = RGMII_MODE | HALF_DUPLEX | GMAC_MODE; - u32 mac_mode = 0; - u32 slot_time; - u32 phy_clk; - u32 ict; - - if (!priv->duplex) - mac_mode |= HALF_DUPLEX; - - if (gigabit) { - if (phy_interface_is_rgmii(dev->phydev)) - mac_mode |= RGMII_MODE; - - mac_mode |= GMAC_MODE; - phy_clk = 125000000; - - /* Should be 512 but register is only 8 bits */ - slot_time = 255; - } else { - phy_clk = 25000000; - slot_time = 128; - } - - ict = DIV_ROUND_UP(phy_clk, clk_get_rate(priv->clk)); - - nb8800_writeb(priv, NB8800_IC_THRESHOLD, ict); - nb8800_writeb(priv, NB8800_SLOT_TIME, slot_time); - nb8800_maskb(priv, NB8800_MAC_MODE, mac_mode_mask, mac_mode); -} - -static void nb8800_pause_config(struct net_device *dev) -{ - struct nb8800_priv *priv = netdev_priv(dev); - struct phy_device *phydev = dev->phydev; - u32 rxcr; - - if (priv->pause_aneg) { - if (!phydev || !phydev->link) - return; - - priv->pause_rx = phydev->pause; - priv->pause_tx = phydev->pause ^ phydev->asym_pause; - } - - nb8800_modb(priv, NB8800_RX_CTL, RX_PAUSE_EN, priv->pause_rx); - - rxcr = nb8800_readl(priv, NB8800_RXC_CR); - if (!!(rxcr & RCR_FL) == priv->pause_tx) - return; - - if (netif_running(dev)) { - napi_disable(&priv->napi); - netif_tx_lock_bh(dev); - nb8800_dma_stop(dev); - nb8800_modl(priv, NB8800_RXC_CR, RCR_FL, priv->pause_tx); - nb8800_start_rx(dev); - netif_tx_unlock_bh(dev); - napi_enable(&priv->napi); - } else { - nb8800_modl(priv, NB8800_RXC_CR, RCR_FL, priv->pause_tx); - } -} - -static void nb8800_link_reconfigure(struct net_device *dev) -{ - struct nb8800_priv *priv = netdev_priv(dev); - struct phy_device *phydev = dev->phydev; - int change = 0; - - if (phydev->link) { - if (phydev->speed != priv->speed) { - priv->speed = phydev->speed; - change = 1; - } - - if (phydev->duplex != priv->duplex) { - priv->duplex = phydev->duplex; - change = 1; - } - - if (change) - nb8800_mac_config(dev); - - nb8800_pause_config(dev); - } - - if (phydev->link != priv->link) { - priv->link = phydev->link; - change = 1; - } - - if (change) - phy_print_status(phydev); -} - -static void nb8800_update_mac_addr(struct net_device *dev) -{ - struct nb8800_priv *priv = netdev_priv(dev); - int i; - - for (i = 0; i < ETH_ALEN; i++) - nb8800_writeb(priv, NB8800_SRC_ADDR(i), dev->dev_addr[i]); - - for (i = 0; i < ETH_ALEN; i++) - nb8800_writeb(priv, NB8800_UC_ADDR(i), dev->dev_addr[i]); -} - -static int nb8800_set_mac_address(struct net_device *dev, void *addr) -{ - struct sockaddr *sock = addr; - - if (netif_running(dev)) - return -EBUSY; - - ether_addr_copy(dev->dev_addr, sock->sa_data); - nb8800_update_mac_addr(dev); - - return 0; -} - -static void nb8800_mc_init(struct net_device *dev, int val) -{ - struct nb8800_priv *priv = netdev_priv(dev); - - nb8800_writeb(priv, NB8800_MC_INIT, val); - readb_poll_timeout_atomic(priv->base + NB8800_MC_INIT, val, !val, - 1, 1000); -} - -static void nb8800_set_rx_mode(struct net_device *dev) -{ - struct nb8800_priv *priv = netdev_priv(dev); - struct netdev_hw_addr *ha; - int i; - - if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) { - nb8800_mac_af(dev, false); - return; - } - - nb8800_mac_af(dev, true); - nb8800_mc_init(dev, 0); - - netdev_for_each_mc_addr(ha, dev) { - for (i = 0; i < ETH_ALEN; i++) - nb8800_writeb(priv, NB8800_MC_ADDR(i), ha->addr[i]); - - nb8800_mc_init(dev, 0xff); - } -} - -#define RX_DESC_SIZE (RX_DESC_COUNT * sizeof(struct nb8800_rx_desc)) -#define TX_DESC_SIZE (TX_DESC_COUNT * sizeof(struct nb8800_tx_desc)) - -static void nb8800_dma_free(struct net_device *dev) -{ - struct nb8800_priv *priv = netdev_priv(dev); - unsigned int i; - - if (priv->rx_bufs) { - for (i = 0; i < RX_DESC_COUNT; i++) - if (priv->rx_bufs[i].page) - put_page(priv->rx_bufs[i].page); - - kfree(priv->rx_bufs); - priv->rx_bufs = NULL; - } - - if (priv->tx_bufs) { - for (i = 0; i < TX_DESC_COUNT; i++) - kfree_skb(priv->tx_bufs[i].skb); - - kfree(priv->tx_bufs); - priv->tx_bufs = NULL; - } - - if (priv->rx_descs) { - dma_free_coherent(dev->dev.parent, RX_DESC_SIZE, priv->rx_descs, - priv->rx_desc_dma); - priv->rx_descs = NULL; - } - - if (priv->tx_descs) { - dma_free_coherent(dev->dev.parent, TX_DESC_SIZE, priv->tx_descs, - priv->tx_desc_dma); - priv->tx_descs = NULL; - } -} - -static void nb8800_dma_reset(struct net_device *dev) -{ - struct nb8800_priv *priv = netdev_priv(dev); - struct nb8800_rx_desc *rxd; - struct nb8800_tx_desc *txd; - unsigned int i; - - for (i = 0; i < RX_DESC_COUNT; i++) { - dma_addr_t rx_dma = priv->rx_desc_dma + i * sizeof(*rxd); - - rxd = &priv->rx_descs[i]; - rxd->desc.n_addr = rx_dma + sizeof(*rxd); - rxd->desc.r_addr = - rx_dma + offsetof(struct nb8800_rx_desc, report); - rxd->desc.config = priv->rx_dma_config; - rxd->report = 0; - } - - rxd->desc.n_addr = priv->rx_desc_dma; - rxd->desc.config |= DESC_EOC; - - priv->rx_eoc = RX_DESC_COUNT - 1; - - for (i = 0; i < TX_DESC_COUNT; i++) { - struct nb8800_tx_buf *txb = &priv->tx_bufs[i]; - dma_addr_t r_dma = txb->dma_desc + - offsetof(struct nb8800_tx_desc, report); - - txd = &priv->tx_descs[i]; - txd->desc[0].r_addr = r_dma; - txd->desc[1].r_addr = r_dma; - txd->report = 0; - } - - priv->tx_next = 0; - priv->tx_queue = 0; - priv->tx_done = 0; - atomic_set(&priv->tx_free, TX_DESC_COUNT); - - nb8800_writel(priv, NB8800_RX_DESC_ADDR, priv->rx_desc_dma); - - wmb(); /* ensure all setup is written before starting */ -} - -static int nb8800_dma_init(struct net_device *dev) -{ - struct nb8800_priv *priv = netdev_priv(dev); - unsigned int n_rx = RX_DESC_COUNT; - unsigned int n_tx = TX_DESC_COUNT; - unsigned int i; - int err; - - priv->rx_descs = dma_alloc_coherent(dev->dev.parent, RX_DESC_SIZE, - &priv->rx_desc_dma, GFP_KERNEL); - if (!priv->rx_descs) - goto err_out; - - priv->rx_bufs = kcalloc(n_rx, sizeof(*priv->rx_bufs), GFP_KERNEL); - if (!priv->rx_bufs) - goto err_out; - - for (i = 0; i < n_rx; i++) { - err = nb8800_alloc_rx(dev, i, false); - if (err) - goto err_out; - } - - priv->tx_descs = dma_alloc_coherent(dev->dev.parent, TX_DESC_SIZE, - &priv->tx_desc_dma, GFP_KERNEL); - if (!priv->tx_descs) - goto err_out; - - priv->tx_bufs = kcalloc(n_tx, sizeof(*priv->tx_bufs), GFP_KERNEL); - if (!priv->tx_bufs) - goto err_out; - - for (i = 0; i < n_tx; i++) - priv->tx_bufs[i].dma_desc = - priv->tx_desc_dma + i * sizeof(struct nb8800_tx_desc); - - nb8800_dma_reset(dev); - - return 0; - -err_out: - nb8800_dma_free(dev); - - return -ENOMEM; -} - -static int nb8800_dma_stop(struct net_device *dev) -{ - struct nb8800_priv *priv = netdev_priv(dev); - struct nb8800_tx_buf *txb = &priv->tx_bufs[0]; - struct nb8800_tx_desc *txd = &priv->tx_descs[0]; - int retry = 5; - u32 txcr; - u32 rxcr; - int err; - unsigned int i; - - /* wait for tx to finish */ - err = readl_poll_timeout_atomic(priv->base + NB8800_TXC_CR, txcr, - !(txcr & TCR_EN) && - priv->tx_done == priv->tx_next, - 1000, 1000000); - if (err) - return err; - - /* The rx DMA only stops if it reaches the end of chain. - * To make this happen, we set the EOC flag on all rx - * descriptors, put the device in loopback mode, and send - * a few dummy frames. The interrupt handler will ignore - * these since NAPI is disabled and no real frames are in - * the tx queue. - */ - - for (i = 0; i < RX_DESC_COUNT; i++) - priv->rx_descs[i].desc.config |= DESC_EOC; - - txd->desc[0].s_addr = - txb->dma_desc + offsetof(struct nb8800_tx_desc, buf); - txd->desc[0].config = DESC_BTS(2) | DESC_DS | DESC_EOF | DESC_EOC | 8; - memset(txd->buf, 0, sizeof(txd->buf)); - - nb8800_mac_af(dev, false); - nb8800_setb(priv, NB8800_MAC_MODE, LOOPBACK_EN); - - do { - nb8800_writel(priv, NB8800_TX_DESC_ADDR, txb->dma_desc); - wmb(); - nb8800_writel(priv, NB8800_TXC_CR, txcr | TCR_EN); - - err = readl_poll_timeout_atomic(priv->base + NB8800_RXC_CR, - rxcr, !(rxcr & RCR_EN), - 1000, 100000); - } while (err && --retry); - - nb8800_mac_af(dev, true); - nb8800_clearb(priv, NB8800_MAC_MODE, LOOPBACK_EN); - nb8800_dma_reset(dev); - - return retry ? 0 : -ETIMEDOUT; -} - -static void nb8800_pause_adv(struct net_device *dev) -{ - struct nb8800_priv *priv = netdev_priv(dev); - struct phy_device *phydev = dev->phydev; - - if (!phydev) - return; - - phy_set_asym_pause(phydev, priv->pause_rx, priv->pause_tx); -} - -static int nb8800_open(struct net_device *dev) -{ - struct nb8800_priv *priv = netdev_priv(dev); - struct phy_device *phydev; - int err; - - /* clear any pending interrupts */ - nb8800_writel(priv, NB8800_RXC_SR, 0xf); - nb8800_writel(priv, NB8800_TXC_SR, 0xf); - - err = nb8800_dma_init(dev); - if (err) - return err; - - err = request_irq(dev->irq, nb8800_irq, 0, dev_name(&dev->dev), dev); - if (err) - goto err_free_dma; - - nb8800_mac_rx(dev, true); - nb8800_mac_tx(dev, true); - - phydev = of_phy_connect(dev, priv->phy_node, - nb8800_link_reconfigure, 0, - priv->phy_mode); - if (!phydev) { - err = -ENODEV; - goto err_free_irq; - } - - nb8800_pause_adv(dev); - - netdev_reset_queue(dev); - napi_enable(&priv->napi); - netif_start_queue(dev); - - nb8800_start_rx(dev); - phy_start(phydev); - - return 0; - -err_free_irq: - free_irq(dev->irq, dev); -err_free_dma: - nb8800_dma_free(dev); - - return err; -} - -static int nb8800_stop(struct net_device *dev) -{ - struct nb8800_priv *priv = netdev_priv(dev); - struct phy_device *phydev = dev->phydev; - - phy_stop(phydev); - - netif_stop_queue(dev); - napi_disable(&priv->napi); - - nb8800_dma_stop(dev); - nb8800_mac_rx(dev, false); - nb8800_mac_tx(dev, false); - - phy_disconnect(phydev); - - free_irq(dev->irq, dev); - - nb8800_dma_free(dev); - - return 0; -} - -static const struct net_device_ops nb8800_netdev_ops = { - .ndo_open = nb8800_open, - .ndo_stop = nb8800_stop, - .ndo_start_xmit = nb8800_xmit, - .ndo_set_mac_address = nb8800_set_mac_address, - .ndo_set_rx_mode = nb8800_set_rx_mode, - .ndo_do_ioctl = phy_do_ioctl, - .ndo_validate_addr = eth_validate_addr, -}; - -static void nb8800_get_pauseparam(struct net_device *dev, - struct ethtool_pauseparam *pp) -{ - struct nb8800_priv *priv = netdev_priv(dev); - - pp->autoneg = priv->pause_aneg; - pp->rx_pause = priv->pause_rx; - pp->tx_pause = priv->pause_tx; -} - -static int nb8800_set_pauseparam(struct net_device *dev, - struct ethtool_pauseparam *pp) -{ - struct nb8800_priv *priv = netdev_priv(dev); - struct phy_device *phydev = dev->phydev; - - priv->pause_aneg = pp->autoneg; - priv->pause_rx = pp->rx_pause; - priv->pause_tx = pp->tx_pause; - - nb8800_pause_adv(dev); - - if (!priv->pause_aneg) - nb8800_pause_config(dev); - else if (phydev) - phy_start_aneg(phydev); - - return 0; -} - -static const char nb8800_stats_names[][ETH_GSTRING_LEN] = { - "rx_bytes_ok", - "rx_frames_ok", - "rx_undersize_frames", - "rx_fragment_frames", - "rx_64_byte_frames", - "rx_127_byte_frames", - "rx_255_byte_frames", - "rx_511_byte_frames", - "rx_1023_byte_frames", - "rx_max_size_frames", - "rx_oversize_frames", - "rx_bad_fcs_frames", - "rx_broadcast_frames", - "rx_multicast_frames", - "rx_control_frames", - "rx_pause_frames", - "rx_unsup_control_frames", - "rx_align_error_frames", - "rx_overrun_frames", - "rx_jabber_frames", - "rx_bytes", - "rx_frames", - - "tx_bytes_ok", - "tx_frames_ok", - "tx_64_byte_frames", - "tx_127_byte_frames", - "tx_255_byte_frames", - "tx_511_byte_frames", - "tx_1023_byte_frames", - "tx_max_size_frames", - "tx_oversize_frames", - "tx_broadcast_frames", - "tx_multicast_frames", - "tx_control_frames", - "tx_pause_frames", - "tx_underrun_frames", - "tx_single_collision_frames", - "tx_multi_collision_frames", - "tx_deferred_collision_frames", - "tx_late_collision_frames", - "tx_excessive_collision_frames", - "tx_bytes", - "tx_frames", - "tx_collisions", -}; - -#define NB8800_NUM_STATS ARRAY_SIZE(nb8800_stats_names) - -static int nb8800_get_sset_count(struct net_device *dev, int sset) -{ - if (sset == ETH_SS_STATS) - return NB8800_NUM_STATS; - - return -EOPNOTSUPP; -} - -static void nb8800_get_strings(struct net_device *dev, u32 sset, u8 *buf) -{ - if (sset == ETH_SS_STATS) - memcpy(buf, &nb8800_stats_names, sizeof(nb8800_stats_names)); -} - -static u32 nb8800_read_stat(struct net_device *dev, int index) -{ - struct nb8800_priv *priv = netdev_priv(dev); - - nb8800_writeb(priv, NB8800_STAT_INDEX, index); - - return nb8800_readl(priv, NB8800_STAT_DATA); -} - -static void nb8800_get_ethtool_stats(struct net_device *dev, - struct ethtool_stats *estats, u64 *st) -{ - unsigned int i; - u32 rx, tx; - - for (i = 0; i < NB8800_NUM_STATS / 2; i++) { - rx = nb8800_read_stat(dev, i); - tx = nb8800_read_stat(dev, i | 0x80); - st[i] = rx; - st[i + NB8800_NUM_STATS / 2] = tx; - } -} - -static const struct ethtool_ops nb8800_ethtool_ops = { - .nway_reset = phy_ethtool_nway_reset, - .get_link = ethtool_op_get_link, - .get_pauseparam = nb8800_get_pauseparam, - .set_pauseparam = nb8800_set_pauseparam, - .get_sset_count = nb8800_get_sset_count, - .get_strings = nb8800_get_strings, - .get_ethtool_stats = nb8800_get_ethtool_stats, - .get_link_ksettings = phy_ethtool_get_link_ksettings, - .set_link_ksettings = phy_ethtool_set_link_ksettings, -}; - -static int nb8800_hw_init(struct net_device *dev) -{ - struct nb8800_priv *priv = netdev_priv(dev); - u32 val; - - val = TX_RETRY_EN | TX_PAD_EN | TX_APPEND_FCS; - nb8800_writeb(priv, NB8800_TX_CTL1, val); - - /* Collision retry count */ - nb8800_writeb(priv, NB8800_TX_CTL2, 5); - - val = RX_PAD_STRIP | RX_AF_EN; - nb8800_writeb(priv, NB8800_RX_CTL, val); - - /* Chosen by fair dice roll */ - nb8800_writeb(priv, NB8800_RANDOM_SEED, 4); - - /* TX cycles per deferral period */ - nb8800_writeb(priv, NB8800_TX_SDP, 12); - - /* The following three threshold values have been - * experimentally determined for good results. - */ - - /* RX/TX FIFO threshold for partial empty (64-bit entries) */ - nb8800_writeb(priv, NB8800_PE_THRESHOLD, 0); - - /* RX/TX FIFO threshold for partial full (64-bit entries) */ - nb8800_writeb(priv, NB8800_PF_THRESHOLD, 255); - - /* Buffer size for transmit (64-bit entries) */ - nb8800_writeb(priv, NB8800_TX_BUFSIZE, 64); - - /* Configure tx DMA */ - - val = nb8800_readl(priv, NB8800_TXC_CR); - val &= TCR_LE; /* keep endian setting */ - val |= TCR_DM; /* DMA descriptor mode */ - val |= TCR_RS; /* automatically store tx status */ - val |= TCR_DIE; /* interrupt on DMA chain completion */ - val |= TCR_TFI(7); /* interrupt after 7 frames transmitted */ - val |= TCR_BTS(2); /* 32-byte bus transaction size */ - nb8800_writel(priv, NB8800_TXC_CR, val); - - /* TX complete interrupt after 10 ms or 7 frames (see above) */ - val = clk_get_rate(priv->clk) / 100; - nb8800_writel(priv, NB8800_TX_ITR, val); - - /* Configure rx DMA */ - - val = nb8800_readl(priv, NB8800_RXC_CR); - val &= RCR_LE; /* keep endian setting */ - val |= RCR_DM; /* DMA descriptor mode */ - val |= RCR_RS; /* automatically store rx status */ - val |= RCR_DIE; /* interrupt at end of DMA chain */ - val |= RCR_RFI(7); /* interrupt after 7 frames received */ - val |= RCR_BTS(2); /* 32-byte bus transaction size */ - nb8800_writel(priv, NB8800_RXC_CR, val); - - /* The rx interrupt can fire before the DMA has completed - * unless a small delay is added. 50 us is hopefully enough. - */ - priv->rx_itr_irq = clk_get_rate(priv->clk) / 20000; - - /* In NAPI poll mode we want to disable interrupts, but the - * hardware does not permit this. Delay 10 ms instead. - */ - priv->rx_itr_poll = clk_get_rate(priv->clk) / 100; - - nb8800_writel(priv, NB8800_RX_ITR, priv->rx_itr_irq); - - priv->rx_dma_config = RX_BUF_SIZE | DESC_BTS(2) | DESC_DS | DESC_EOF; - - /* Flow control settings */ - - /* Pause time of 0.1 ms */ - val = 100000 / 512; - nb8800_writeb(priv, NB8800_PQ1, val >> 8); - nb8800_writeb(priv, NB8800_PQ2, val & 0xff); - - /* Auto-negotiate by default */ - priv->pause_aneg = true; - priv->pause_rx = true; - priv->pause_tx = true; - - nb8800_mc_init(dev, 0); - - return 0; -} - -static int nb8800_tangox_init(struct net_device *dev) -{ - struct nb8800_priv *priv = netdev_priv(dev); - u32 pad_mode = PAD_MODE_MII; - - switch (priv->phy_mode) { - case PHY_INTERFACE_MODE_MII: - case PHY_INTERFACE_MODE_GMII: - pad_mode = PAD_MODE_MII; - break; - - case PHY_INTERFACE_MODE_RGMII: - case PHY_INTERFACE_MODE_RGMII_ID: - case PHY_INTERFACE_MODE_RGMII_RXID: - case PHY_INTERFACE_MODE_RGMII_TXID: - pad_mode = PAD_MODE_RGMII; - break; - - default: - dev_err(dev->dev.parent, "unsupported phy mode %s\n", - phy_modes(priv->phy_mode)); - return -EINVAL; - } - - nb8800_writeb(priv, NB8800_TANGOX_PAD_MODE, pad_mode); - - return 0; -} - -static int nb8800_tangox_reset(struct net_device *dev) -{ - struct nb8800_priv *priv = netdev_priv(dev); - int clk_div; - - nb8800_writeb(priv, NB8800_TANGOX_RESET, 0); - usleep_range(1000, 10000); - nb8800_writeb(priv, NB8800_TANGOX_RESET, 1); - - wmb(); /* ensure reset is cleared before proceeding */ - - clk_div = DIV_ROUND_UP(clk_get_rate(priv->clk), 2 * MAX_MDC_CLOCK); - nb8800_writew(priv, NB8800_TANGOX_MDIO_CLKDIV, clk_div); - - return 0; -} - -static const struct nb8800_ops nb8800_tangox_ops = { - .init = nb8800_tangox_init, - .reset = nb8800_tangox_reset, -}; - -static int nb8800_tango4_init(struct net_device *dev) -{ - struct nb8800_priv *priv = netdev_priv(dev); - int err; - - err = nb8800_tangox_init(dev); - if (err) - return err; - - /* On tango4 interrupt on DMA completion per frame works and gives - * better performance despite generating more rx interrupts. - */ - - /* Disable unnecessary interrupt on rx completion */ - nb8800_clearl(priv, NB8800_RXC_CR, RCR_RFI(7)); - - /* Request interrupt on descriptor DMA completion */ - priv->rx_dma_config |= DESC_ID; - - return 0; -} - -static const struct nb8800_ops nb8800_tango4_ops = { - .init = nb8800_tango4_init, - .reset = nb8800_tangox_reset, -}; - -static const struct of_device_id nb8800_dt_ids[] = { - { - .compatible = "aurora,nb8800", - }, - { - .compatible = "sigma,smp8642-ethernet", - .data = &nb8800_tangox_ops, - }, - { - .compatible = "sigma,smp8734-ethernet", - .data = &nb8800_tango4_ops, - }, - { } -}; -MODULE_DEVICE_TABLE(of, nb8800_dt_ids); - -static int nb8800_probe(struct platform_device *pdev) -{ - const struct of_device_id *match; - const struct nb8800_ops *ops = NULL; - struct nb8800_priv *priv; - struct resource *res; - struct net_device *dev; - struct mii_bus *bus; - const unsigned char *mac; - void __iomem *base; - int irq; - int ret; - - match = of_match_device(nb8800_dt_ids, &pdev->dev); - if (match) - ops = match->data; - - irq = platform_get_irq(pdev, 0); - if (irq <= 0) - return -EINVAL; - - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - base = devm_ioremap_resource(&pdev->dev, res); - if (IS_ERR(base)) - return PTR_ERR(base); - - dev_dbg(&pdev->dev, "AU-NB8800 Ethernet at %pa\n", &res->start); - - dev = alloc_etherdev(sizeof(*priv)); - if (!dev) - return -ENOMEM; - - platform_set_drvdata(pdev, dev); - SET_NETDEV_DEV(dev, &pdev->dev); - - priv = netdev_priv(dev); - priv->base = base; - - ret = of_get_phy_mode(pdev->dev.of_node, &priv->phy_mode); - if (ret) - priv->phy_mode = PHY_INTERFACE_MODE_RGMII; - - priv->clk = devm_clk_get(&pdev->dev, NULL); - if (IS_ERR(priv->clk)) { - dev_err(&pdev->dev, "failed to get clock\n"); - ret = PTR_ERR(priv->clk); - goto err_free_dev; - } - - ret = clk_prepare_enable(priv->clk); - if (ret) - goto err_free_dev; - - spin_lock_init(&priv->tx_lock); - - if (ops && ops->reset) { - ret = ops->reset(dev); - if (ret) - goto err_disable_clk; - } - - bus = devm_mdiobus_alloc(&pdev->dev); - if (!bus) { - ret = -ENOMEM; - goto err_disable_clk; - } - - bus->name = "nb8800-mii"; - bus->read = nb8800_mdio_read; - bus->write = nb8800_mdio_write; - bus->parent = &pdev->dev; - snprintf(bus->id, MII_BUS_ID_SIZE, "%lx.nb8800-mii", - (unsigned long)res->start); - bus->priv = priv; - - ret = of_mdiobus_register(bus, pdev->dev.of_node); - if (ret) { - dev_err(&pdev->dev, "failed to register MII bus\n"); - goto err_disable_clk; - } - - if (of_phy_is_fixed_link(pdev->dev.of_node)) { - ret = of_phy_register_fixed_link(pdev->dev.of_node); - if (ret < 0) { - dev_err(&pdev->dev, "bad fixed-link spec\n"); - goto err_free_bus; - } - priv->phy_node = of_node_get(pdev->dev.of_node); - } - - if (!priv->phy_node) - priv->phy_node = of_parse_phandle(pdev->dev.of_node, - "phy-handle", 0); - - if (!priv->phy_node) { - dev_err(&pdev->dev, "no PHY specified\n"); - ret = -ENODEV; - goto err_free_bus; - } - - priv->mii_bus = bus; - - ret = nb8800_hw_init(dev); - if (ret) - goto err_deregister_fixed_link; - - if (ops && ops->init) { - ret = ops->init(dev); - if (ret) - goto err_deregister_fixed_link; - } - - dev->netdev_ops = &nb8800_netdev_ops; - dev->ethtool_ops = &nb8800_ethtool_ops; - dev->flags |= IFF_MULTICAST; - dev->irq = irq; - - mac = of_get_mac_address(pdev->dev.of_node); - if (!IS_ERR(mac)) - ether_addr_copy(dev->dev_addr, mac); - - if (!is_valid_ether_addr(dev->dev_addr)) - eth_hw_addr_random(dev); - - nb8800_update_mac_addr(dev); - - netif_carrier_off(dev); - - ret = register_netdev(dev); - if (ret) { - netdev_err(dev, "failed to register netdev\n"); - goto err_free_dma; - } - - netif_napi_add(dev, &priv->napi, nb8800_poll, NAPI_POLL_WEIGHT); - - netdev_info(dev, "MAC address %pM\n", dev->dev_addr); - - return 0; - -err_free_dma: - nb8800_dma_free(dev); -err_deregister_fixed_link: - if (of_phy_is_fixed_link(pdev->dev.of_node)) - of_phy_deregister_fixed_link(pdev->dev.of_node); -err_free_bus: - of_node_put(priv->phy_node); - mdiobus_unregister(bus); -err_disable_clk: - clk_disable_unprepare(priv->clk); -err_free_dev: - free_netdev(dev); - - return ret; -} - -static int nb8800_remove(struct platform_device *pdev) -{ - struct net_device *ndev = platform_get_drvdata(pdev); - struct nb8800_priv *priv = netdev_priv(ndev); - - unregister_netdev(ndev); - if (of_phy_is_fixed_link(pdev->dev.of_node)) - of_phy_deregister_fixed_link(pdev->dev.of_node); - of_node_put(priv->phy_node); - - mdiobus_unregister(priv->mii_bus); - - clk_disable_unprepare(priv->clk); - - nb8800_dma_free(ndev); - free_netdev(ndev); - - return 0; -} - -static struct platform_driver nb8800_driver = { - .driver = { - .name = "nb8800", - .of_match_table = nb8800_dt_ids, - }, - .probe = nb8800_probe, - .remove = nb8800_remove, -}; - -module_platform_driver(nb8800_driver); - -MODULE_DESCRIPTION("Aurora AU-NB8800 Ethernet driver"); -MODULE_AUTHOR("Mans Rullgard <mans@mansr.com>"); -MODULE_LICENSE("GPL"); |