--- /dev/null
+/*
+ * Atmel MACB Ethernet Controller driver
+ *
+ * Copyright (C) 2004-2006 Atmel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/clk.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/mii.h>
+#include <linux/mutex.h>
+#include <linux/dma-mapping.h>
+#include <linux/ethtool.h>
+#include <linux/platform_device.h>
+
+#include <asm/arch/board.h>
+
+#include "macb.h"
+
+#define to_net_dev(class) container_of(class, struct net_device, class_dev)
+
+#define RX_BUFFER_SIZE 128
+#define RX_RING_SIZE 512
+#define RX_RING_BYTES (sizeof(struct dma_desc) * RX_RING_SIZE)
+
+/* Make the IP header word-aligned (the ethernet header is 14 bytes) */
+#define RX_OFFSET 2
+
+#define TX_RING_SIZE 128
+#define DEF_TX_RING_PENDING (TX_RING_SIZE - 1)
+#define TX_RING_BYTES (sizeof(struct dma_desc) * TX_RING_SIZE)
+
+#define TX_RING_GAP(bp) \
+ (TX_RING_SIZE - (bp)->tx_pending)
+#define TX_BUFFS_AVAIL(bp) \
+ (((bp)->tx_tail <= (bp)->tx_head) ? \
+ (bp)->tx_tail + (bp)->tx_pending - (bp)->tx_head : \
+ (bp)->tx_tail - (bp)->tx_head - TX_RING_GAP(bp))
+#define NEXT_TX(n) (((n) + 1) & (TX_RING_SIZE - 1))
+
+#define NEXT_RX(n) (((n) + 1) & (RX_RING_SIZE - 1))
+
+/* minimum number of free TX descriptors before waking up TX process */
+#define MACB_TX_WAKEUP_THRESH (TX_RING_SIZE / 4)
+
+#define MACB_RX_INT_FLAGS (MACB_BIT(RCOMP) | MACB_BIT(RXUBR) \
+ | MACB_BIT(ISR_ROVR))
+
+static void __macb_set_hwaddr(struct macb *bp)
+{
+ u32 bottom;
+ u16 top;
+
+ bottom = cpu_to_le32(*((u32 *)bp->dev->dev_addr));
+ macb_writel(bp, SA1B, bottom);
+ top = cpu_to_le16(*((u16 *)(bp->dev->dev_addr + 4)));
+ macb_writel(bp, SA1T, top);
+}
+
+static void __init macb_get_hwaddr(struct macb *bp)
+{
+ u32 bottom;
+ u16 top;
+ u8 addr[6];
+
+ bottom = macb_readl(bp, SA1B);
+ top = macb_readl(bp, SA1T);
+
+ addr[0] = bottom & 0xff;
+ addr[1] = (bottom >> 8) & 0xff;
+ addr[2] = (bottom >> 16) & 0xff;
+ addr[3] = (bottom >> 24) & 0xff;
+ addr[4] = top & 0xff;
+ addr[5] = (top >> 8) & 0xff;
+
+ if (is_valid_ether_addr(addr))
+ memcpy(bp->dev->dev_addr, addr, sizeof(addr));
+}
+
+static void macb_enable_mdio(struct macb *bp)
+{
+ unsigned long flags;
+ u32 reg;
+
+ spin_lock_irqsave(&bp->lock, flags);
+ reg = macb_readl(bp, NCR);
+ reg |= MACB_BIT(MPE);
+ macb_writel(bp, NCR, reg);
+ macb_writel(bp, IER, MACB_BIT(MFD));
+ spin_unlock_irqrestore(&bp->lock, flags);
+}
+
+static void macb_disable_mdio(struct macb *bp)
+{
+ unsigned long flags;
+ u32 reg;
+
+ spin_lock_irqsave(&bp->lock, flags);
+ reg = macb_readl(bp, NCR);
+ reg &= ~MACB_BIT(MPE);
+ macb_writel(bp, NCR, reg);
+ macb_writel(bp, IDR, MACB_BIT(MFD));
+ spin_unlock_irqrestore(&bp->lock, flags);
+}
+
+static int macb_mdio_read(struct net_device *dev, int phy_id, int location)
+{
+ struct macb *bp = netdev_priv(dev);
+ int value;
+
+ mutex_lock(&bp->mdio_mutex);
+
+ macb_enable_mdio(bp);
+ macb_writel(bp, MAN, (MACB_BF(SOF, MACB_MAN_SOF)
+ | MACB_BF(RW, MACB_MAN_READ)
+ | MACB_BF(PHYA, phy_id)
+ | MACB_BF(REGA, location)
+ | MACB_BF(CODE, MACB_MAN_CODE)));
+
+ wait_for_completion(&bp->mdio_complete);
+
+ value = MACB_BFEXT(DATA, macb_readl(bp, MAN));
+ macb_disable_mdio(bp);
+ mutex_unlock(&bp->mdio_mutex);
+
+ return value;
+}
+
+static void macb_mdio_write(struct net_device *dev, int phy_id,
+ int location, int val)
+{
+ struct macb *bp = netdev_priv(dev);
+
+ dev_dbg(&bp->pdev->dev, "mdio_write %02x:%02x <- %04x\n",
+ phy_id, location, val);
+
+ mutex_lock(&bp->mdio_mutex);
+ macb_enable_mdio(bp);
+
+ macb_writel(bp, MAN, (MACB_BF(SOF, MACB_MAN_SOF)
+ | MACB_BF(RW, MACB_MAN_WRITE)
+ | MACB_BF(PHYA, phy_id)
+ | MACB_BF(REGA, location)
+ | MACB_BF(CODE, MACB_MAN_CODE)
+ | MACB_BF(DATA, val)));
+
+ wait_for_completion(&bp->mdio_complete);
+
+ macb_disable_mdio(bp);
+ mutex_unlock(&bp->mdio_mutex);
+}
+
+static int macb_phy_probe(struct macb *bp)
+{
+ int phy_address;
+ u16 phyid1, phyid2;
+
+ for (phy_address = 0; phy_address < 32; phy_address++) {
+ phyid1 = macb_mdio_read(bp->dev, phy_address, MII_PHYSID1);
+ phyid2 = macb_mdio_read(bp->dev, phy_address, MII_PHYSID2);
+
+ if (phyid1 != 0xffff && phyid1 != 0x0000
+ && phyid2 != 0xffff && phyid2 != 0x0000)
+ break;
+ }
+
+ if (phy_address == 32)
+ return -ENODEV;
+
+ dev_info(&bp->pdev->dev,
+ "detected PHY at address %d (ID %04x:%04x)\n",
+ phy_address, phyid1, phyid2);
+
+ bp->mii.phy_id = phy_address;
+ return 0;
+}
+
+static void macb_set_media(struct macb *bp, int media)
+{
+ u32 reg;
+
+ spin_lock_irq(&bp->lock);
+ reg = macb_readl(bp, NCFGR);
+ reg &= ~(MACB_BIT(SPD) | MACB_BIT(FD));
+ if (media & (ADVERTISE_100HALF | ADVERTISE_100FULL))
+ reg |= MACB_BIT(SPD);
+ if (media & ADVERTISE_FULL)
+ reg |= MACB_BIT(FD);
+ macb_writel(bp, NCFGR, reg);
+ spin_unlock_irq(&bp->lock);
+}
+
+static void macb_check_media(struct macb *bp, int ok_to_print, int init_media)
+{
+ struct mii_if_info *mii = &bp->mii;
+ unsigned int old_carrier, new_carrier;
+ int advertise, lpa, media, duplex;
+
+ /* if forced media, go no further */
+ if (mii->force_media)
+ return;
+
+ /* check current and old link status */
+ old_carrier = netif_carrier_ok(mii->dev) ? 1 : 0;
+ new_carrier = (unsigned int) mii_link_ok(mii);
+
+ /* if carrier state did not change, assume nothing else did */
+ if (!init_media && old_carrier == new_carrier)
+ return;
+
+ /* no carrier, nothing much to do */
+ if (!new_carrier) {
+ netif_carrier_off(mii->dev);
+ printk(KERN_INFO "%s: link down\n", mii->dev->name);
+ return;
+ }
+
+ /*
+ * we have carrier, see who's on the other end
+ */
+ netif_carrier_on(mii->dev);
+
+ /* get MII advertise and LPA values */
+ if (!init_media && mii->advertising) {
+ advertise = mii->advertising;
+ } else {
+ advertise = mii->mdio_read(mii->dev, mii->phy_id, MII_ADVERTISE);
+ mii->advertising = advertise;
+ }
+ lpa = mii->mdio_read(mii->dev, mii->phy_id, MII_LPA);
+
+ /* figure out media and duplex from advertise and LPA values */
+ media = mii_nway_result(lpa & advertise);
+ duplex = (media & ADVERTISE_FULL) ? 1 : 0;
+
+ if (ok_to_print)
+ printk(KERN_INFO "%s: link up, %sMbps, %s-duplex, lpa 0x%04X\n",
+ mii->dev->name,
+ media & (ADVERTISE_100FULL | ADVERTISE_100HALF) ? "100" : "10",
+ duplex ? "full" : "half", lpa);
+
+ mii->full_duplex = duplex;
+
+ /* Let the MAC know about the new link state */
+ macb_set_media(bp, media);
+}
+
+static void macb_update_stats(struct macb *bp)
+{
+ u32 __iomem *reg = bp->regs + MACB_PFR;
+ u32 *p = &bp->hw_stats.rx_pause_frames;
+ u32 *end = &bp->hw_stats.tx_pause_frames + 1;
+
+ WARN_ON((unsigned long)(end - p - 1) != (MACB_TPF - MACB_PFR) / 4);
+
+ for(; p < end; p++, reg++)
+ *p += __raw_readl(reg);
+}
+
+static void macb_periodic_task(struct work_struct *work)
+{
+ struct macb *bp = container_of(work, struct macb, periodic_task.work);
+
+ macb_update_stats(bp);
+ macb_check_media(bp, 1, 0);
+
+ schedule_delayed_work(&bp->periodic_task, HZ);
+}
+
+static void macb_tx(struct macb *bp)
+{
+ unsigned int tail;
+ unsigned int head;
+ u32 status;
+
+ status = macb_readl(bp, TSR);
+ macb_writel(bp, TSR, status);
+
+ dev_dbg(&bp->pdev->dev, "macb_tx status = %02lx\n",
+ (unsigned long)status);
+
+ if (status & MACB_BIT(UND)) {
+ printk(KERN_ERR "%s: TX underrun, resetting buffers\n",
+ bp->dev->name);
+ bp->tx_head = bp->tx_tail = 0;
+ }
+
+ if (!(status & MACB_BIT(COMP)))
+ /*
+ * This may happen when a buffer becomes complete
+ * between reading the ISR and scanning the
+ * descriptors. Nothing to worry about.
+ */
+ return;
+
+ head = bp->tx_head;
+ for (tail = bp->tx_tail; tail != head; tail = NEXT_TX(tail)) {
+ struct ring_info *rp = &bp->tx_skb[tail];
+ struct sk_buff *skb = rp->skb;
+ u32 bufstat;
+
+ BUG_ON(skb == NULL);
+
+ rmb();
+ bufstat = bp->tx_ring[tail].ctrl;
+
+ if (!(bufstat & MACB_BIT(TX_USED)))
+ break;
+
+ dev_dbg(&bp->pdev->dev, "skb %u (data %p) TX complete\n",
+ tail, skb->data);
+ dma_unmap_single(&bp->pdev->dev, rp->mapping, skb->len,
+ DMA_TO_DEVICE);
+ bp->stats.tx_packets++;
+ bp->stats.tx_bytes += skb->len;
+ rp->skb = NULL;
+ dev_kfree_skb_irq(skb);
+ }
+
+ bp->tx_tail = tail;
+ if (netif_queue_stopped(bp->dev) &&
+ TX_BUFFS_AVAIL(bp) > MACB_TX_WAKEUP_THRESH)
+ netif_wake_queue(bp->dev);
+}
+
+static int macb_rx_frame(struct macb *bp, unsigned int first_frag,
+ unsigned int last_frag)
+{
+ unsigned int len;
+ unsigned int frag;
+ unsigned int offset = 0;
+ struct sk_buff *skb;
+
+ len = MACB_BFEXT(RX_FRMLEN, bp->rx_ring[last_frag].ctrl);
+
+ dev_dbg(&bp->pdev->dev, "macb_rx_frame frags %u - %u (len %u)\n",
+ first_frag, last_frag, len);
+
+ skb = dev_alloc_skb(len + RX_OFFSET);
+ if (!skb) {
+ bp->stats.rx_dropped++;
+ for (frag = first_frag; ; frag = NEXT_RX(frag)) {
+ bp->rx_ring[frag].addr &= ~MACB_BIT(RX_USED);
+ if (frag == last_frag)
+ break;
+ }
+ wmb();
+ return 1;
+ }
+
+ skb_reserve(skb, RX_OFFSET);
+ skb->dev = bp->dev;
+ skb->ip_summed = CHECKSUM_NONE;
+ skb_put(skb, len);
+
+ for (frag = first_frag; ; frag = NEXT_RX(frag)) {
+ unsigned int frag_len = RX_BUFFER_SIZE;
+
+ if (offset + frag_len > len) {
+ BUG_ON(frag != last_frag);
+ frag_len = len - offset;
+ }
+ memcpy(skb->data + offset,
+ bp->rx_buffers + (RX_BUFFER_SIZE * frag),
+ frag_len);
+ offset += RX_BUFFER_SIZE;
+ bp->rx_ring[frag].addr &= ~MACB_BIT(RX_USED);
+ wmb();
+
+ if (frag == last_frag)
+ break;
+ }
+
+ skb->protocol = eth_type_trans(skb, bp->dev);
+
+ bp->stats.rx_packets++;
+ bp->stats.rx_bytes += len;
+ bp->dev->last_rx = jiffies;
+ dev_dbg(&bp->pdev->dev, "received skb of length %u, csum: %08x\n",
+ skb->len, skb->csum);
+ netif_receive_skb(skb);
+
+ return 0;
+}
+
+/* Mark DMA descriptors from begin up to and not including end as unused */
+static void discard_partial_frame(struct macb *bp, unsigned int begin,
+ unsigned int end)
+{
+ unsigned int frag;
+
+ for (frag = begin; frag != end; frag = NEXT_RX(frag))
+ bp->rx_ring[frag].addr &= ~MACB_BIT(RX_USED);
+ wmb();
+
+ /*
+ * When this happens, the hardware stats registers for
+ * whatever caused this is updated, so we don't have to record
+ * anything.
+ */
+}
+
+static int macb_rx(struct macb *bp, int budget)
+{
+ int received = 0;
+ unsigned int tail = bp->rx_tail;
+ int first_frag = -1;
+
+ for (; budget > 0; tail = NEXT_RX(tail)) {
+ u32 addr, ctrl;
+
+ rmb();
+ addr = bp->rx_ring[tail].addr;
+ ctrl = bp->rx_ring[tail].ctrl;
+
+ if (!(addr & MACB_BIT(RX_USED)))
+ break;
+
+ if (ctrl & MACB_BIT(RX_SOF)) {
+ if (first_frag != -1)
+ discard_partial_frame(bp, first_frag, tail);
+ first_frag = tail;
+ }
+
+ if (ctrl & MACB_BIT(RX_EOF)) {
+ int dropped;
+ BUG_ON(first_frag == -1);
+
+ dropped = macb_rx_frame(bp, first_frag, tail);
+ first_frag = -1;
+ if (!dropped) {
+ received++;
+ budget--;
+ }
+ }
+ }
+
+ if (first_frag != -1)
+ bp->rx_tail = first_frag;
+ else
+ bp->rx_tail = tail;
+
+ return received;
+}
+
+static int macb_poll(struct net_device *dev, int *budget)
+{
+ struct macb *bp = netdev_priv(dev);
+ int orig_budget, work_done, retval = 0;
+ u32 status;
+
+ status = macb_readl(bp, RSR);
+ macb_writel(bp, RSR, status);
+
+ if (!status) {
+ /*
+ * This may happen if an interrupt was pending before
+ * this function was called last time, and no packets
+ * have been received since.
+ */
+ netif_rx_complete(dev);
+ goto out;
+ }
+
+ dev_dbg(&bp->pdev->dev, "poll: status = %08lx, budget = %d\n",
+ (unsigned long)status, *budget);
+
+ if (!(status & MACB_BIT(REC))) {
+ dev_warn(&bp->pdev->dev,
+ "No RX buffers complete, status = %02lx\n",
+ (unsigned long)status);
+ netif_rx_complete(dev);
+ goto out;
+ }
+
+ orig_budget = *budget;
+ if (orig_budget > dev->quota)
+ orig_budget = dev->quota;
+
+ work_done = macb_rx(bp, orig_budget);
+ if (work_done < orig_budget) {
+ netif_rx_complete(dev);
+ retval = 0;
+ } else {
+ retval = 1;
+ }
+
+ /*
+ * We've done what we can to clean the buffers. Make sure we
+ * get notified when new packets arrive.
+ */
+out:
+ macb_writel(bp, IER, MACB_RX_INT_FLAGS);
+
+ /* TODO: Handle errors */
+
+ return retval;
+}
+
+static irqreturn_t macb_interrupt(int irq, void *dev_id)
+{
+ struct net_device *dev = dev_id;
+ struct macb *bp = netdev_priv(dev);
+ u32 status;
+
+ status = macb_readl(bp, ISR);
+
+ if (unlikely(!status))
+ return IRQ_NONE;
+
+ spin_lock(&bp->lock);
+
+ while (status) {
+ if (status & MACB_BIT(MFD))
+ complete(&bp->mdio_complete);
+
+ /* close possible race with dev_close */
+ if (unlikely(!netif_running(dev))) {
+ macb_writel(bp, IDR, ~0UL);
+ break;
+ }
+
+ if (status & MACB_RX_INT_FLAGS) {
+ if (netif_rx_schedule_prep(dev)) {
+ /*
+ * There's no point taking any more interrupts
+ * until we have processed the buffers
+ */
+ macb_writel(bp, IDR, MACB_RX_INT_FLAGS);
+ dev_dbg(&bp->pdev->dev, "scheduling RX softirq\n");
+ __netif_rx_schedule(dev);
+ }
+ }
+
+ if (status & (MACB_BIT(TCOMP) | MACB_BIT(ISR_TUND)))
+ macb_tx(bp);
+
+ /*
+ * Link change detection isn't possible with RMII, so we'll
+ * add that if/when we get our hands on a full-blown MII PHY.
+ */
+
+ if (status & MACB_BIT(HRESP)) {
+ /*
+ * TODO: Reset the hardware, and maybe move the printk
+ * to a lower-priority context as well (work queue?)
+ */
+ printk(KERN_ERR "%s: DMA bus error: HRESP not OK\n",
+ dev->name);
+ }
+
+ status = macb_readl(bp, ISR);
+ }
+
+ spin_unlock(&bp->lock);
+
+ return IRQ_HANDLED;
+}
+
+static int macb_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct macb *bp = netdev_priv(dev);
+ dma_addr_t mapping;
+ unsigned int len, entry;
+ u32 ctrl;
+
+#ifdef DEBUG
+ int i;
+ dev_dbg(&bp->pdev->dev,
+ "start_xmit: len %u head %p data %p tail %p end %p\n",
+ skb->len, skb->head, skb->data, skb->tail, skb->end);
+ dev_dbg(&bp->pdev->dev,
+ "data:");
+ for (i = 0; i < 16; i++)
+ printk(" %02x", (unsigned int)skb->data[i]);
+ printk("\n");
+#endif
+
+ len = skb->len;
+ spin_lock_irq(&bp->lock);
+
+ /* This is a hard error, log it. */
+ if (TX_BUFFS_AVAIL(bp) < 1) {
+ netif_stop_queue(dev);
+ spin_unlock_irq(&bp->lock);
+ dev_err(&bp->pdev->dev,
+ "BUG! Tx Ring full when queue awake!\n");
+ dev_dbg(&bp->pdev->dev, "tx_head = %u, tx_tail = %u\n",
+ bp->tx_head, bp->tx_tail);
+ return 1;
+ }
+
+ entry = bp->tx_head;
+ dev_dbg(&bp->pdev->dev, "Allocated ring entry %u\n", entry);
+ mapping = dma_map_single(&bp->pdev->dev, skb->data,
+ len, DMA_TO_DEVICE);
+ bp->tx_skb[entry].skb = skb;
+ bp->tx_skb[entry].mapping = mapping;
+ dev_dbg(&bp->pdev->dev, "Mapped skb data %p to DMA addr %08lx\n",
+ skb->data, (unsigned long)mapping);
+
+ ctrl = MACB_BF(TX_FRMLEN, len);
+ ctrl |= MACB_BIT(TX_LAST);
+ if (entry == (TX_RING_SIZE - 1))
+ ctrl |= MACB_BIT(TX_WRAP);
+
+ bp->tx_ring[entry].addr = mapping;
+ bp->tx_ring[entry].ctrl = ctrl;
+ wmb();
+
+ entry = NEXT_TX(entry);
+ bp->tx_head = entry;
+
+ macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(TSTART));
+
+ if (TX_BUFFS_AVAIL(bp) < 1)
+ netif_stop_queue(dev);
+
+ spin_unlock_irq(&bp->lock);
+
+ dev->trans_start = jiffies;
+
+ return 0;
+}
+
+static void macb_free_consistent(struct macb *bp)
+{
+ if (bp->tx_skb) {
+ kfree(bp->tx_skb);
+ bp->tx_skb = NULL;
+ }
+ if (bp->rx_ring) {
+ dma_free_coherent(&bp->pdev->dev, RX_RING_BYTES,
+ bp->rx_ring, bp->rx_ring_dma);
+ bp->rx_ring = NULL;
+ }
+ if (bp->tx_ring) {
+ dma_free_coherent(&bp->pdev->dev, TX_RING_BYTES,
+ bp->tx_ring, bp->tx_ring_dma);
+ bp->tx_ring = NULL;
+ }
+ if (bp->rx_buffers) {
+ dma_free_coherent(&bp->pdev->dev,
+ RX_RING_SIZE * RX_BUFFER_SIZE,
+ bp->rx_buffers, bp->rx_buffers_dma);
+ bp->rx_buffers = NULL;
+ }
+}
+
+static int macb_alloc_consistent(struct macb *bp)
+{
+ int size;
+
+ size = TX_RING_SIZE * sizeof(struct ring_info);
+ bp->tx_skb = kmalloc(size, GFP_KERNEL);
+ if (!bp->tx_skb)
+ goto out_err;
+
+ size = RX_RING_BYTES;
+ bp->rx_ring = dma_alloc_coherent(&bp->pdev->dev, size,
+ &bp->rx_ring_dma, GFP_KERNEL);
+ if (!bp->rx_ring)
+ goto out_err;
+ dev_dbg(&bp->pdev->dev,
+ "Allocated RX ring of %d bytes at %08lx (mapped %p)\n",
+ size, (unsigned long)bp->rx_ring_dma, bp->rx_ring);
+
+ size = TX_RING_BYTES;
+ bp->tx_ring = dma_alloc_coherent(&bp->pdev->dev, size,
+ &bp->tx_ring_dma, GFP_KERNEL);
+ if (!bp->tx_ring)
+ goto out_err;
+ dev_dbg(&bp->pdev->dev,
+ "Allocated TX ring of %d bytes at %08lx (mapped %p)\n",
+ size, (unsigned long)bp->tx_ring_dma, bp->tx_ring);
+
+ size = RX_RING_SIZE * RX_BUFFER_SIZE;
+ bp->rx_buffers = dma_alloc_coherent(&bp->pdev->dev, size,
+ &bp->rx_buffers_dma, GFP_KERNEL);
+ if (!bp->rx_buffers)
+ goto out_err;
+ dev_dbg(&bp->pdev->dev,
+ "Allocated RX buffers of %d bytes at %08lx (mapped %p)\n",
+ size, (unsigned long)bp->rx_buffers_dma, bp->rx_buffers);
+
+ return 0;
+
+out_err:
+ macb_free_consistent(bp);
+ return -ENOMEM;
+}
+
+static void macb_init_rings(struct macb *bp)
+{
+ int i;
+ dma_addr_t addr;
+
+ addr = bp->rx_buffers_dma;
+ for (i = 0; i < RX_RING_SIZE; i++) {
+ bp->rx_ring[i].addr = addr;
+ bp->rx_ring[i].ctrl = 0;
+ addr += RX_BUFFER_SIZE;
+ }
+ bp->rx_ring[RX_RING_SIZE - 1].addr |= MACB_BIT(RX_WRAP);
+
+ for (i = 0; i < TX_RING_SIZE; i++) {
+ bp->tx_ring[i].addr = 0;
+ bp->tx_ring[i].ctrl = MACB_BIT(TX_USED);
+ }
+ bp->tx_ring[TX_RING_SIZE - 1].ctrl |= MACB_BIT(TX_WRAP);
+
+ bp->rx_tail = bp->tx_head = bp->tx_tail = 0;
+}
+
+static void macb_reset_hw(struct macb *bp)
+{
+ /* Make sure we have the write buffer for ourselves */
+ wmb();
+
+ /*
+ * Disable RX and TX (XXX: Should we halt the transmission
+ * more gracefully?)
+ */
+ macb_writel(bp, NCR, 0);
+
+ /* Clear the stats registers (XXX: Update stats first?) */
+ macb_writel(bp, NCR, MACB_BIT(CLRSTAT));
+
+ /* Clear all status flags */
+ macb_writel(bp, TSR, ~0UL);
+ macb_writel(bp, RSR, ~0UL);
+
+ /* Disable all interrupts */
+ macb_writel(bp, IDR, ~0UL);
+ macb_readl(bp, ISR);
+}
+
+static void macb_init_hw(struct macb *bp)
+{
+ u32 config;
+
+ macb_reset_hw(bp);
+ __macb_set_hwaddr(bp);
+
+ config = macb_readl(bp, NCFGR) & MACB_BF(CLK, -1L);
+ config |= MACB_BIT(PAE); /* PAuse Enable */
+ config |= MACB_BIT(DRFCS); /* Discard Rx FCS */
+ if (bp->dev->flags & IFF_PROMISC)
+ config |= MACB_BIT(CAF); /* Copy All Frames */
+ if (!(bp->dev->flags & IFF_BROADCAST))
+ config |= MACB_BIT(NBC); /* No BroadCast */
+ macb_writel(bp, NCFGR, config);
+
+ /* Initialize TX and RX buffers */
+ macb_writel(bp, RBQP, bp->rx_ring_dma);
+ macb_writel(bp, TBQP, bp->tx_ring_dma);
+
+ /* Enable TX and RX */
+ macb_writel(bp, NCR, MACB_BIT(RE) | MACB_BIT(TE));
+
+ /* Enable interrupts */
+ macb_writel(bp, IER, (MACB_BIT(RCOMP)
+ | MACB_BIT(RXUBR)
+ | MACB_BIT(ISR_TUND)
+ | MACB_BIT(ISR_RLE)
+ | MACB_BIT(TXERR)
+ | MACB_BIT(TCOMP)
+ | MACB_BIT(ISR_ROVR)
+ | MACB_BIT(HRESP)));
+}
+
+static void macb_init_phy(struct net_device *dev)
+{
+ struct macb *bp = netdev_priv(dev);
+
+ /* Set some reasonable default settings */
+ macb_mdio_write(dev, bp->mii.phy_id, MII_ADVERTISE,
+ ADVERTISE_CSMA | ADVERTISE_ALL);
+ macb_mdio_write(dev, bp->mii.phy_id, MII_BMCR,
+ (BMCR_SPEED100 | BMCR_ANENABLE
+ | BMCR_ANRESTART | BMCR_FULLDPLX));
+}
+
+static int macb_open(struct net_device *dev)
+{
+ struct macb *bp = netdev_priv(dev);
+ int err;
+
+ dev_dbg(&bp->pdev->dev, "open\n");
+
+ if (!is_valid_ether_addr(dev->dev_addr))
+ return -EADDRNOTAVAIL;
+
+ err = macb_alloc_consistent(bp);
+ if (err) {
+ printk(KERN_ERR
+ "%s: Unable to allocate DMA memory (error %d)\n",
+ dev->name, err);
+ return err;
+ }
+
+ macb_init_rings(bp);
+ macb_init_hw(bp);
+ macb_init_phy(dev);
+
+ macb_check_media(bp, 1, 1);
+ netif_start_queue(dev);
+
+ schedule_delayed_work(&bp->periodic_task, HZ);
+
+ return 0;
+}
+
+static int macb_close(struct net_device *dev)
+{
+ struct macb *bp = netdev_priv(dev);
+ unsigned long flags;
+
+ cancel_rearming_delayed_work(&bp->periodic_task);
+
+ netif_stop_queue(dev);
+
+ spin_lock_irqsave(&bp->lock, flags);
+ macb_reset_hw(bp);
+ netif_carrier_off(dev);
+ spin_unlock_irqrestore(&bp->lock, flags);
+
+ macb_free_consistent(bp);
+
+ return 0;
+}
+
+static struct net_device_stats *macb_get_stats(struct net_device *dev)
+{
+ struct macb *bp = netdev_priv(dev);
+ struct net_device_stats *nstat = &bp->stats;
+ struct macb_stats *hwstat = &bp->hw_stats;
+
+ /* Convert HW stats into netdevice stats */
+ nstat->rx_errors = (hwstat->rx_fcs_errors +
+ hwstat->rx_align_errors +
+ hwstat->rx_resource_errors +
+ hwstat->rx_overruns +
+ hwstat->rx_oversize_pkts +
+ hwstat->rx_jabbers +
+ hwstat->rx_undersize_pkts +
+ hwstat->sqe_test_errors +
+ hwstat->rx_length_mismatch);
+ nstat->tx_errors = (hwstat->tx_late_cols +
+ hwstat->tx_excessive_cols +
+ hwstat->tx_underruns +
+ hwstat->tx_carrier_errors);
+ nstat->collisions = (hwstat->tx_single_cols +
+ hwstat->tx_multiple_cols +
+ hwstat->tx_excessive_cols);
+ nstat->rx_length_errors = (hwstat->rx_oversize_pkts +
+ hwstat->rx_jabbers +
+ hwstat->rx_undersize_pkts +
+ hwstat->rx_length_mismatch);
+ nstat->rx_over_errors = hwstat->rx_resource_errors;
+ nstat->rx_crc_errors = hwstat->rx_fcs_errors;
+ nstat->rx_frame_errors = hwstat->rx_align_errors;
+ nstat->rx_fifo_errors = hwstat->rx_overruns;
+ /* XXX: What does "missed" mean? */
+ nstat->tx_aborted_errors = hwstat->tx_excessive_cols;
+ nstat->tx_carrier_errors = hwstat->tx_carrier_errors;
+ nstat->tx_fifo_errors = hwstat->tx_underruns;
+ /* Don't know about heartbeat or window errors... */
+
+ return nstat;
+}
+
+static int macb_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
+{
+ struct macb *bp = netdev_priv(dev);
+ int ret;
+ unsigned long flags;
+
+ spin_lock_irqsave(&bp->lock, flags);
+ ret = mii_ethtool_gset(&bp->mii, cmd);
+ spin_unlock_irqrestore(&bp->lock, flags);
+
+ return ret;
+}
+
+static int macb_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
+{
+ struct macb *bp = netdev_priv(dev);
+ int ret;
+ unsigned long flags;
+
+ spin_lock_irqsave(&bp->lock, flags);
+ ret = mii_ethtool_sset(&bp->mii, cmd);
+ spin_unlock_irqrestore(&bp->lock, flags);
+
+ return ret;
+}
+
+static void macb_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
+{
+ struct macb *bp = netdev_priv(dev);
+
+ strcpy(info->driver, bp->pdev->dev.driver->name);
+ strcpy(info->version, "$Revision: 1.14 $");
+ strcpy(info->bus_info, bp->pdev->dev.bus_id);
+}
+
+static int macb_nway_reset(struct net_device *dev)
+{
+ struct macb *bp = netdev_priv(dev);
+ return mii_nway_restart(&bp->mii);
+}
+
+static struct ethtool_ops macb_ethtool_ops = {
+ .get_settings = macb_get_settings,
+ .set_settings = macb_set_settings,
+ .get_drvinfo = macb_get_drvinfo,
+ .nway_reset = macb_nway_reset,
+ .get_link = ethtool_op_get_link,
+};
+
+static int macb_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
+{
+ struct macb *bp = netdev_priv(dev);
+ int ret;
+ unsigned long flags;
+
+ if (!netif_running(dev))
+ return -EINVAL;
+
+ spin_lock_irqsave(&bp->lock, flags);
+ ret = generic_mii_ioctl(&bp->mii, if_mii(rq), cmd, NULL);
+ spin_unlock_irqrestore(&bp->lock, flags);
+
+ return ret;
+}
+
+static ssize_t macb_mii_show(const struct class_device *cd, char *buf,
+ unsigned long addr)
+{
+ struct net_device *dev = to_net_dev(cd);
+ struct macb *bp = netdev_priv(dev);
+ ssize_t ret = -EINVAL;
+
+ if (netif_running(dev)) {
+ int value;
+ value = macb_mdio_read(dev, bp->mii.phy_id, addr);
+ ret = sprintf(buf, "0x%04x\n", (uint16_t)value);
+ }
+
+ return ret;
+}
+
+#define MII_ENTRY(name, addr) \
+static ssize_t show_##name(struct class_device *cd, char *buf) \
+{ \
+ return macb_mii_show(cd, buf, addr); \
+} \
+static CLASS_DEVICE_ATTR(name, S_IRUGO, show_##name, NULL)
+
+MII_ENTRY(bmcr, MII_BMCR);
+MII_ENTRY(bmsr, MII_BMSR);
+MII_ENTRY(physid1, MII_PHYSID1);
+MII_ENTRY(physid2, MII_PHYSID2);
+MII_ENTRY(advertise, MII_ADVERTISE);
+MII_ENTRY(lpa, MII_LPA);
+MII_ENTRY(expansion, MII_EXPANSION);
+
+static struct attribute *macb_mii_attrs[] = {
+ &class_device_attr_bmcr.attr,
+ &class_device_attr_bmsr.attr,
+ &class_device_attr_physid1.attr,
+ &class_device_attr_physid2.attr,
+ &class_device_attr_advertise.attr,
+ &class_device_attr_lpa.attr,
+ &class_device_attr_expansion.attr,
+ NULL,
+};
+
+static struct attribute_group macb_mii_group = {
+ .name = "mii",
+ .attrs = macb_mii_attrs,
+};
+
+static void macb_unregister_sysfs(struct net_device *net)
+{
+ struct class_device *class_dev = &net->class_dev;
+
+ sysfs_remove_group(&class_dev->kobj, &macb_mii_group);
+}
+
+static int macb_register_sysfs(struct net_device *net)
+{
+ struct class_device *class_dev = &net->class_dev;
+ int ret;
+
+ ret = sysfs_create_group(&class_dev->kobj, &macb_mii_group);
+ if (ret)
+ printk(KERN_WARNING
+ "%s: sysfs mii attribute registration failed: %d\n",
+ net->name, ret);
+ return ret;
+}
+static int __devinit macb_probe(struct platform_device *pdev)
+{
+ struct eth_platform_data *pdata;
+ struct resource *regs;
+ struct net_device *dev;
+ struct macb *bp;
+ unsigned long pclk_hz;
+ u32 config;
+ int err = -ENXIO;
+
+ regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!regs) {
+ dev_err(&pdev->dev, "no mmio resource defined\n");
+ goto err_out;
+ }
+
+ err = -ENOMEM;
+ dev = alloc_etherdev(sizeof(*bp));
+ if (!dev) {
+ dev_err(&pdev->dev, "etherdev alloc failed, aborting.\n");
+ goto err_out;
+ }
+
+ SET_MODULE_OWNER(dev);
+ SET_NETDEV_DEV(dev, &pdev->dev);
+
+ /* TODO: Actually, we have some interesting features... */
+ dev->features |= 0;
+
+ bp = netdev_priv(dev);
+ bp->pdev = pdev;
+ bp->dev = dev;
+
+ spin_lock_init(&bp->lock);
+
+ bp->pclk = clk_get(&pdev->dev, "pclk");
+ if (IS_ERR(bp->pclk)) {
+ dev_err(&pdev->dev, "failed to get pclk\n");
+ goto err_out_free_dev;
+ }
+ bp->hclk = clk_get(&pdev->dev, "hclk");
+ if (IS_ERR(bp->hclk)) {
+ dev_err(&pdev->dev, "failed to get hclk\n");
+ goto err_out_put_pclk;
+ }
+
+ clk_enable(bp->pclk);
+ clk_enable(bp->hclk);
+
+ bp->regs = ioremap(regs->start, regs->end - regs->start + 1);
+ if (!bp->regs) {
+ dev_err(&pdev->dev, "failed to map registers, aborting.\n");
+ err = -ENOMEM;
+ goto err_out_disable_clocks;
+ }
+
+ dev->irq = platform_get_irq(pdev, 0);
+ err = request_irq(dev->irq, macb_interrupt, SA_SAMPLE_RANDOM,
+ dev->name, dev);
+ if (err) {
+ printk(KERN_ERR
+ "%s: Unable to request IRQ %d (error %d)\n",
+ dev->name, dev->irq, err);
+ goto err_out_iounmap;
+ }
+
+ dev->open = macb_open;
+ dev->stop = macb_close;
+ dev->hard_start_xmit = macb_start_xmit;
+ dev->get_stats = macb_get_stats;
+ dev->do_ioctl = macb_ioctl;
+ dev->poll = macb_poll;
+ dev->weight = 64;
+ dev->ethtool_ops = &macb_ethtool_ops;
+
+ dev->base_addr = regs->start;
+
+ INIT_DELAYED_WORK(&bp->periodic_task, macb_periodic_task);
+ mutex_init(&bp->mdio_mutex);
+ init_completion(&bp->mdio_complete);
+
+ /* Set MII management clock divider */
+ pclk_hz = clk_get_rate(bp->pclk);
+ if (pclk_hz <= 20000000)
+ config = MACB_BF(CLK, MACB_CLK_DIV8);
+ else if (pclk_hz <= 40000000)
+ config = MACB_BF(CLK, MACB_CLK_DIV16);
+ else if (pclk_hz <= 80000000)
+ config = MACB_BF(CLK, MACB_CLK_DIV32);
+ else
+ config = MACB_BF(CLK, MACB_CLK_DIV64);
+ macb_writel(bp, NCFGR, config);
+
+ bp->mii.dev = dev;
+ bp->mii.mdio_read = macb_mdio_read;
+ bp->mii.mdio_write = macb_mdio_write;
+ bp->mii.phy_id_mask = 0x1f;
+ bp->mii.reg_num_mask = 0x1f;
+
+ macb_get_hwaddr(bp);
+ err = macb_phy_probe(bp);
+ if (err) {
+ dev_err(&pdev->dev, "Failed to detect PHY, aborting.\n");
+ goto err_out_free_irq;
+ }
+
+ pdata = pdev->dev.platform_data;
+ if (pdata && pdata->is_rmii)
+ macb_writel(bp, USRIO, 0);
+ else
+ macb_writel(bp, USRIO, MACB_BIT(MII));
+
+ bp->tx_pending = DEF_TX_RING_PENDING;
+
+ err = register_netdev(dev);
+ if (err) {
+ dev_err(&pdev->dev, "Cannot register net device, aborting.\n");
+ goto err_out_free_irq;
+ }
+
+ platform_set_drvdata(pdev, dev);
+
+ macb_register_sysfs(dev);
+
+ printk(KERN_INFO "%s: Atmel MACB at 0x%08lx irq %d "
+ "(%02x:%02x:%02x:%02x:%02x:%02x)\n",
+ dev->name, dev->base_addr, dev->irq,
+ dev->dev_addr[0], dev->dev_addr[1], dev->dev_addr[2],
+ dev->dev_addr[3], dev->dev_addr[4], dev->dev_addr[5]);
+
+ return 0;
+
+err_out_free_irq:
+ free_irq(dev->irq, dev);
+err_out_iounmap:
+ iounmap(bp->regs);
+err_out_disable_clocks:
+ clk_disable(bp->hclk);
+ clk_disable(bp->pclk);
+ clk_put(bp->hclk);
+err_out_put_pclk:
+ clk_put(bp->pclk);
+err_out_free_dev:
+ free_netdev(dev);
+err_out:
+ platform_set_drvdata(pdev, NULL);
+ return err;
+}
+
+static int __devexit macb_remove(struct platform_device *pdev)
+{
+ struct net_device *dev;
+ struct macb *bp;
+
+ dev = platform_get_drvdata(pdev);
+
+ if (dev) {
+ bp = netdev_priv(dev);
+ macb_unregister_sysfs(dev);
+ unregister_netdev(dev);
+ free_irq(dev->irq, dev);
+ iounmap(bp->regs);
+ clk_disable(bp->hclk);
+ clk_disable(bp->pclk);
+ clk_put(bp->hclk);
+ clk_put(bp->pclk);
+ free_netdev(dev);
+ platform_set_drvdata(pdev, NULL);
+ }
+
+ return 0;
+}
+
+static struct platform_driver macb_driver = {
+ .probe = macb_probe,
+ .remove = __devexit_p(macb_remove),
+ .driver = {
+ .name = "macb",
+ },
+};
+
+static int __init macb_init(void)
+{
+ return platform_driver_register(&macb_driver);
+}
+
+static void __exit macb_exit(void)
+{
+ platform_driver_unregister(&macb_driver);
+}
+
+module_init(macb_init);
+module_exit(macb_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Atmel MACB Ethernet driver");
+MODULE_AUTHOR("Haavard Skinnemoen <hskinnemoen@atmel.com>");
git://git.onelab.eu / linux-2.6.git / blobdiff