+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0+
-/*
- * Copyright (C) 2006, 2007 Eugene Konev
- *
- */
-
-#include <linux/module.h>
-#include <linux/interrupt.h>
-#include <linux/moduleparam.h>
-
-#include <linux/sched.h>
-#include <linux/kernel.h>
-#include <linux/slab.h>
-#include <linux/errno.h>
-#include <linux/types.h>
-#include <linux/delay.h>
-
-#include <linux/netdevice.h>
-#include <linux/if_vlan.h>
-#include <linux/etherdevice.h>
-#include <linux/ethtool.h>
-#include <linux/skbuff.h>
-#include <linux/mii.h>
-#include <linux/phy.h>
-#include <linux/phy_fixed.h>
-#include <linux/platform_device.h>
-#include <linux/dma-mapping.h>
-#include <linux/clk.h>
-#include <linux/gpio.h>
-#include <linux/atomic.h>
-
-#include <asm/mach-ar7/ar7.h>
-
-MODULE_AUTHOR("Eugene Konev <ejka@imfi.kspu.ru>");
-MODULE_DESCRIPTION("TI AR7 ethernet driver (CPMAC)");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS("platform:cpmac");
-
-static int debug_level = 8;
-static int dumb_switch;
-
-/* Next 2 are only used in cpmac_probe, so it's pointless to change them */
-module_param(debug_level, int, 0444);
-module_param(dumb_switch, int, 0444);
-
-MODULE_PARM_DESC(debug_level, "Number of NETIF_MSG bits to enable");
-MODULE_PARM_DESC(dumb_switch, "Assume switch is not connected to MDIO bus");
-
-#define CPMAC_VERSION "0.5.2"
-/* frame size + 802.1q tag + FCS size */
-#define CPMAC_SKB_SIZE (ETH_FRAME_LEN + ETH_FCS_LEN + VLAN_HLEN)
-#define CPMAC_QUEUES 8
-
-/* Ethernet registers */
-#define CPMAC_TX_CONTROL 0x0004
-#define CPMAC_TX_TEARDOWN 0x0008
-#define CPMAC_RX_CONTROL 0x0014
-#define CPMAC_RX_TEARDOWN 0x0018
-#define CPMAC_MBP 0x0100
-#define MBP_RXPASSCRC 0x40000000
-#define MBP_RXQOS 0x20000000
-#define MBP_RXNOCHAIN 0x10000000
-#define MBP_RXCMF 0x01000000
-#define MBP_RXSHORT 0x00800000
-#define MBP_RXCEF 0x00400000
-#define MBP_RXPROMISC 0x00200000
-#define MBP_PROMISCCHAN(channel) (((channel) & 0x7) << 16)
-#define MBP_RXBCAST 0x00002000
-#define MBP_BCASTCHAN(channel) (((channel) & 0x7) << 8)
-#define MBP_RXMCAST 0x00000020
-#define MBP_MCASTCHAN(channel) ((channel) & 0x7)
-#define CPMAC_UNICAST_ENABLE 0x0104
-#define CPMAC_UNICAST_CLEAR 0x0108
-#define CPMAC_MAX_LENGTH 0x010c
-#define CPMAC_BUFFER_OFFSET 0x0110
-#define CPMAC_MAC_CONTROL 0x0160
-#define MAC_TXPTYPE 0x00000200
-#define MAC_TXPACE 0x00000040
-#define MAC_MII 0x00000020
-#define MAC_TXFLOW 0x00000010
-#define MAC_RXFLOW 0x00000008
-#define MAC_MTEST 0x00000004
-#define MAC_LOOPBACK 0x00000002
-#define MAC_FDX 0x00000001
-#define CPMAC_MAC_STATUS 0x0164
-#define MAC_STATUS_QOS 0x00000004
-#define MAC_STATUS_RXFLOW 0x00000002
-#define MAC_STATUS_TXFLOW 0x00000001
-#define CPMAC_TX_INT_ENABLE 0x0178
-#define CPMAC_TX_INT_CLEAR 0x017c
-#define CPMAC_MAC_INT_VECTOR 0x0180
-#define MAC_INT_STATUS 0x00080000
-#define MAC_INT_HOST 0x00040000
-#define MAC_INT_RX 0x00020000
-#define MAC_INT_TX 0x00010000
-#define CPMAC_MAC_EOI_VECTOR 0x0184
-#define CPMAC_RX_INT_ENABLE 0x0198
-#define CPMAC_RX_INT_CLEAR 0x019c
-#define CPMAC_MAC_INT_ENABLE 0x01a8
-#define CPMAC_MAC_INT_CLEAR 0x01ac
-#define CPMAC_MAC_ADDR_LO(channel) (0x01b0 + (channel) * 4)
-#define CPMAC_MAC_ADDR_MID 0x01d0
-#define CPMAC_MAC_ADDR_HI 0x01d4
-#define CPMAC_MAC_HASH_LO 0x01d8
-#define CPMAC_MAC_HASH_HI 0x01dc
-#define CPMAC_TX_PTR(channel) (0x0600 + (channel) * 4)
-#define CPMAC_RX_PTR(channel) (0x0620 + (channel) * 4)
-#define CPMAC_TX_ACK(channel) (0x0640 + (channel) * 4)
-#define CPMAC_RX_ACK(channel) (0x0660 + (channel) * 4)
-#define CPMAC_REG_END 0x0680
-
-/* Rx/Tx statistics
- * TODO: use some of them to fill stats in cpmac_stats()
- */
-#define CPMAC_STATS_RX_GOOD 0x0200
-#define CPMAC_STATS_RX_BCAST 0x0204
-#define CPMAC_STATS_RX_MCAST 0x0208
-#define CPMAC_STATS_RX_PAUSE 0x020c
-#define CPMAC_STATS_RX_CRC 0x0210
-#define CPMAC_STATS_RX_ALIGN 0x0214
-#define CPMAC_STATS_RX_OVER 0x0218
-#define CPMAC_STATS_RX_JABBER 0x021c
-#define CPMAC_STATS_RX_UNDER 0x0220
-#define CPMAC_STATS_RX_FRAG 0x0224
-#define CPMAC_STATS_RX_FILTER 0x0228
-#define CPMAC_STATS_RX_QOSFILTER 0x022c
-#define CPMAC_STATS_RX_OCTETS 0x0230
-
-#define CPMAC_STATS_TX_GOOD 0x0234
-#define CPMAC_STATS_TX_BCAST 0x0238
-#define CPMAC_STATS_TX_MCAST 0x023c
-#define CPMAC_STATS_TX_PAUSE 0x0240
-#define CPMAC_STATS_TX_DEFER 0x0244
-#define CPMAC_STATS_TX_COLLISION 0x0248
-#define CPMAC_STATS_TX_SINGLECOLL 0x024c
-#define CPMAC_STATS_TX_MULTICOLL 0x0250
-#define CPMAC_STATS_TX_EXCESSCOLL 0x0254
-#define CPMAC_STATS_TX_LATECOLL 0x0258
-#define CPMAC_STATS_TX_UNDERRUN 0x025c
-#define CPMAC_STATS_TX_CARRIERSENSE 0x0260
-#define CPMAC_STATS_TX_OCTETS 0x0264
-
-#define cpmac_read(base, reg) (readl((void __iomem *)(base) + (reg)))
-#define cpmac_write(base, reg, val) (writel(val, (void __iomem *)(base) + \
- (reg)))
-
-/* MDIO bus */
-#define CPMAC_MDIO_VERSION 0x0000
-#define CPMAC_MDIO_CONTROL 0x0004
-#define MDIOC_IDLE 0x80000000
-#define MDIOC_ENABLE 0x40000000
-#define MDIOC_PREAMBLE 0x00100000
-#define MDIOC_FAULT 0x00080000
-#define MDIOC_FAULTDETECT 0x00040000
-#define MDIOC_INTTEST 0x00020000
-#define MDIOC_CLKDIV(div) ((div) & 0xff)
-#define CPMAC_MDIO_ALIVE 0x0008
-#define CPMAC_MDIO_LINK 0x000c
-#define CPMAC_MDIO_ACCESS(channel) (0x0080 + (channel) * 8)
-#define MDIO_BUSY 0x80000000
-#define MDIO_WRITE 0x40000000
-#define MDIO_REG(reg) (((reg) & 0x1f) << 21)
-#define MDIO_PHY(phy) (((phy) & 0x1f) << 16)
-#define MDIO_DATA(data) ((data) & 0xffff)
-#define CPMAC_MDIO_PHYSEL(channel) (0x0084 + (channel) * 8)
-#define PHYSEL_LINKSEL 0x00000040
-#define PHYSEL_LINKINT 0x00000020
-
-struct cpmac_desc {
- u32 hw_next;
- u32 hw_data;
- u16 buflen;
- u16 bufflags;
- u16 datalen;
- u16 dataflags;
-#define CPMAC_SOP 0x8000
-#define CPMAC_EOP 0x4000
-#define CPMAC_OWN 0x2000
-#define CPMAC_EOQ 0x1000
- struct sk_buff *skb;
- struct cpmac_desc *next;
- struct cpmac_desc *prev;
- dma_addr_t mapping;
- dma_addr_t data_mapping;
-};
-
-struct cpmac_priv {
- spinlock_t lock;
- spinlock_t rx_lock;
- struct cpmac_desc *rx_head;
- int ring_size;
- struct cpmac_desc *desc_ring;
- dma_addr_t dma_ring;
- void __iomem *regs;
- struct mii_bus *mii_bus;
- char phy_name[MII_BUS_ID_SIZE + 3];
- int oldlink, oldspeed, oldduplex;
- u32 msg_enable;
- struct net_device *dev;
- struct work_struct reset_work;
- struct platform_device *pdev;
- struct napi_struct napi;
- atomic_t reset_pending;
-};
-
-static irqreturn_t cpmac_irq(int, void *);
-static void cpmac_hw_start(struct net_device *dev);
-static void cpmac_hw_stop(struct net_device *dev);
-static int cpmac_stop(struct net_device *dev);
-static int cpmac_open(struct net_device *dev);
-
-static void cpmac_dump_regs(struct net_device *dev)
-{
- int i;
- struct cpmac_priv *priv = netdev_priv(dev);
-
- for (i = 0; i < CPMAC_REG_END; i += 4) {
- if (i % 16 == 0) {
- if (i)
- printk("\n");
- printk("%s: reg[%p]:", dev->name, priv->regs + i);
- }
- printk(" %08x", cpmac_read(priv->regs, i));
- }
- printk("\n");
-}
-
-static void cpmac_dump_desc(struct net_device *dev, struct cpmac_desc *desc)
-{
- int i;
-
- printk("%s: desc[%p]:", dev->name, desc);
- for (i = 0; i < sizeof(*desc) / 4; i++)
- printk(" %08x", ((u32 *)desc)[i]);
- printk("\n");
-}
-
-static void cpmac_dump_all_desc(struct net_device *dev)
-{
- struct cpmac_priv *priv = netdev_priv(dev);
- struct cpmac_desc *dump = priv->rx_head;
-
- do {
- cpmac_dump_desc(dev, dump);
- dump = dump->next;
- } while (dump != priv->rx_head);
-}
-
-static void cpmac_dump_skb(struct net_device *dev, struct sk_buff *skb)
-{
- int i;
-
- printk("%s: skb 0x%p, len=%d\n", dev->name, skb, skb->len);
- for (i = 0; i < skb->len; i++) {
- if (i % 16 == 0) {
- if (i)
- printk("\n");
- printk("%s: data[%p]:", dev->name, skb->data + i);
- }
- printk(" %02x", ((u8 *)skb->data)[i]);
- }
- printk("\n");
-}
-
-static int cpmac_mdio_read(struct mii_bus *bus, int phy_id, int reg)
-{
- u32 val;
-
- while (cpmac_read(bus->priv, CPMAC_MDIO_ACCESS(0)) & MDIO_BUSY)
- cpu_relax();
- cpmac_write(bus->priv, CPMAC_MDIO_ACCESS(0), MDIO_BUSY | MDIO_REG(reg) |
- MDIO_PHY(phy_id));
- while ((val = cpmac_read(bus->priv, CPMAC_MDIO_ACCESS(0))) & MDIO_BUSY)
- cpu_relax();
-
- return MDIO_DATA(val);
-}
-
-static int cpmac_mdio_write(struct mii_bus *bus, int phy_id,
- int reg, u16 val)
-{
- while (cpmac_read(bus->priv, CPMAC_MDIO_ACCESS(0)) & MDIO_BUSY)
- cpu_relax();
- cpmac_write(bus->priv, CPMAC_MDIO_ACCESS(0), MDIO_BUSY | MDIO_WRITE |
- MDIO_REG(reg) | MDIO_PHY(phy_id) | MDIO_DATA(val));
-
- return 0;
-}
-
-static int cpmac_mdio_reset(struct mii_bus *bus)
-{
- struct clk *cpmac_clk;
-
- cpmac_clk = clk_get(&bus->dev, "cpmac");
- if (IS_ERR(cpmac_clk)) {
- pr_err("unable to get cpmac clock\n");
- return -1;
- }
- ar7_device_reset(AR7_RESET_BIT_MDIO);
- cpmac_write(bus->priv, CPMAC_MDIO_CONTROL, MDIOC_ENABLE |
- MDIOC_CLKDIV(clk_get_rate(cpmac_clk) / 2200000 - 1));
-
- return 0;
-}
-
-static struct mii_bus *cpmac_mii;
-
-static void cpmac_set_multicast_list(struct net_device *dev)
-{
- struct netdev_hw_addr *ha;
- u8 tmp;
- u32 mbp, bit, hash[2] = { 0, };
- struct cpmac_priv *priv = netdev_priv(dev);
-
- mbp = cpmac_read(priv->regs, CPMAC_MBP);
- if (dev->flags & IFF_PROMISC) {
- cpmac_write(priv->regs, CPMAC_MBP, (mbp & ~MBP_PROMISCCHAN(0)) |
- MBP_RXPROMISC);
- } else {
- cpmac_write(priv->regs, CPMAC_MBP, mbp & ~MBP_RXPROMISC);
- if (dev->flags & IFF_ALLMULTI) {
- /* enable all multicast mode */
- cpmac_write(priv->regs, CPMAC_MAC_HASH_LO, 0xffffffff);
- cpmac_write(priv->regs, CPMAC_MAC_HASH_HI, 0xffffffff);
- } else {
- /* cpmac uses some strange mac address hashing
- * (not crc32)
- */
- netdev_for_each_mc_addr(ha, dev) {
- bit = 0;
- tmp = ha->addr[0];
- bit ^= (tmp >> 2) ^ (tmp << 4);
- tmp = ha->addr[1];
- bit ^= (tmp >> 4) ^ (tmp << 2);
- tmp = ha->addr[2];
- bit ^= (tmp >> 6) ^ tmp;
- tmp = ha->addr[3];
- bit ^= (tmp >> 2) ^ (tmp << 4);
- tmp = ha->addr[4];
- bit ^= (tmp >> 4) ^ (tmp << 2);
- tmp = ha->addr[5];
- bit ^= (tmp >> 6) ^ tmp;
- bit &= 0x3f;
- hash[bit / 32] |= 1 << (bit % 32);
- }
-
- cpmac_write(priv->regs, CPMAC_MAC_HASH_LO, hash[0]);
- cpmac_write(priv->regs, CPMAC_MAC_HASH_HI, hash[1]);
- }
- }
-}
-
-static struct sk_buff *cpmac_rx_one(struct cpmac_priv *priv,
- struct cpmac_desc *desc)
-{
- struct sk_buff *skb, *result = NULL;
-
- if (unlikely(netif_msg_hw(priv)))
- cpmac_dump_desc(priv->dev, desc);
- cpmac_write(priv->regs, CPMAC_RX_ACK(0), (u32)desc->mapping);
- if (unlikely(!desc->datalen)) {
- if (netif_msg_rx_err(priv) && net_ratelimit())
- netdev_warn(priv->dev, "rx: spurious interrupt\n");
-
- return NULL;
- }
-
- skb = netdev_alloc_skb_ip_align(priv->dev, CPMAC_SKB_SIZE);
- if (likely(skb)) {
- skb_put(desc->skb, desc->datalen);
- desc->skb->protocol = eth_type_trans(desc->skb, priv->dev);
- skb_checksum_none_assert(desc->skb);
- priv->dev->stats.rx_packets++;
- priv->dev->stats.rx_bytes += desc->datalen;
- result = desc->skb;
- dma_unmap_single(&priv->dev->dev, desc->data_mapping,
- CPMAC_SKB_SIZE, DMA_FROM_DEVICE);
- desc->skb = skb;
- desc->data_mapping = dma_map_single(&priv->dev->dev, skb->data,
- CPMAC_SKB_SIZE,
- DMA_FROM_DEVICE);
- desc->hw_data = (u32)desc->data_mapping;
- if (unlikely(netif_msg_pktdata(priv))) {
- netdev_dbg(priv->dev, "received packet:\n");
- cpmac_dump_skb(priv->dev, result);
- }
- } else {
- if (netif_msg_rx_err(priv) && net_ratelimit())
- netdev_warn(priv->dev,
- "low on skbs, dropping packet\n");
-
- priv->dev->stats.rx_dropped++;
- }
-
- desc->buflen = CPMAC_SKB_SIZE;
- desc->dataflags = CPMAC_OWN;
-
- return result;
-}
-
-static int cpmac_poll(struct napi_struct *napi, int budget)
-{
- struct sk_buff *skb;
- struct cpmac_desc *desc, *restart;
- struct cpmac_priv *priv = container_of(napi, struct cpmac_priv, napi);
- int received = 0, processed = 0;
-
- spin_lock(&priv->rx_lock);
- if (unlikely(!priv->rx_head)) {
- if (netif_msg_rx_err(priv) && net_ratelimit())
- netdev_warn(priv->dev, "rx: polling, but no queue\n");
-
- spin_unlock(&priv->rx_lock);
- napi_complete(napi);
- return 0;
- }
-
- desc = priv->rx_head;
- restart = NULL;
- while (((desc->dataflags & CPMAC_OWN) == 0) && (received < budget)) {
- processed++;
-
- if ((desc->dataflags & CPMAC_EOQ) != 0) {
- /* The last update to eoq->hw_next didn't happen
- * soon enough, and the receiver stopped here.
- * Remember this descriptor so we can restart
- * the receiver after freeing some space.
- */
- if (unlikely(restart)) {
- if (netif_msg_rx_err(priv))
- netdev_err(priv->dev, "poll found a"
- " duplicate EOQ: %p and %p\n",
- restart, desc);
- goto fatal_error;
- }
-
- restart = desc->next;
- }
-
- skb = cpmac_rx_one(priv, desc);
- if (likely(skb)) {
- netif_receive_skb(skb);
- received++;
- }
- desc = desc->next;
- }
-
- if (desc != priv->rx_head) {
- /* We freed some buffers, but not the whole ring,
- * add what we did free to the rx list
- */
- desc->prev->hw_next = (u32)0;
- priv->rx_head->prev->hw_next = priv->rx_head->mapping;
- }
-
- /* Optimization: If we did not actually process an EOQ (perhaps because
- * of quota limits), check to see if the tail of the queue has EOQ set.
- * We should immediately restart in that case so that the receiver can
- * restart and run in parallel with more packet processing.
- * This lets us handle slightly larger bursts before running
- * out of ring space (assuming dev->weight < ring_size)
- */
-
- if (!restart &&
- (priv->rx_head->prev->dataflags & (CPMAC_OWN|CPMAC_EOQ))
- == CPMAC_EOQ &&
- (priv->rx_head->dataflags & CPMAC_OWN) != 0) {
- /* reset EOQ so the poll loop (above) doesn't try to
- * restart this when it eventually gets to this descriptor.
- */
- priv->rx_head->prev->dataflags &= ~CPMAC_EOQ;
- restart = priv->rx_head;
- }
-
- if (restart) {
- priv->dev->stats.rx_errors++;
- priv->dev->stats.rx_fifo_errors++;
- if (netif_msg_rx_err(priv) && net_ratelimit())
- netdev_warn(priv->dev, "rx dma ring overrun\n");
-
- if (unlikely((restart->dataflags & CPMAC_OWN) == 0)) {
- if (netif_msg_drv(priv))
- netdev_err(priv->dev, "cpmac_poll is trying "
- "to restart rx from a descriptor "
- "that's not free: %p\n", restart);
- goto fatal_error;
- }
-
- cpmac_write(priv->regs, CPMAC_RX_PTR(0), restart->mapping);
- }
-
- priv->rx_head = desc;
- spin_unlock(&priv->rx_lock);
- if (unlikely(netif_msg_rx_status(priv)))
- netdev_dbg(priv->dev, "poll processed %d packets\n", received);
-
- if (processed == 0) {
- /* we ran out of packets to read,
- * revert to interrupt-driven mode
- */
- napi_complete(napi);
- cpmac_write(priv->regs, CPMAC_RX_INT_ENABLE, 1);
- return 0;
- }
-
- return 1;
-
-fatal_error:
- /* Something went horribly wrong.
- * Reset hardware to try to recover rather than wedging.
- */
- if (netif_msg_drv(priv)) {
- netdev_err(priv->dev, "cpmac_poll is confused. "
- "Resetting hardware\n");
- cpmac_dump_all_desc(priv->dev);
- netdev_dbg(priv->dev, "RX_PTR(0)=0x%08x RX_ACK(0)=0x%08x\n",
- cpmac_read(priv->regs, CPMAC_RX_PTR(0)),
- cpmac_read(priv->regs, CPMAC_RX_ACK(0)));
- }
-
- spin_unlock(&priv->rx_lock);
- napi_complete(napi);
- netif_tx_stop_all_queues(priv->dev);
- napi_disable(&priv->napi);
-
- atomic_inc(&priv->reset_pending);
- cpmac_hw_stop(priv->dev);
- if (!schedule_work(&priv->reset_work))
- atomic_dec(&priv->reset_pending);
-
- return 0;
-
-}
-
-static netdev_tx_t cpmac_start_xmit(struct sk_buff *skb, struct net_device *dev)
-{
- int queue;
- unsigned int len;
- struct cpmac_desc *desc;
- struct cpmac_priv *priv = netdev_priv(dev);
-
- if (unlikely(atomic_read(&priv->reset_pending)))
- return NETDEV_TX_BUSY;
-
- if (unlikely(skb_padto(skb, ETH_ZLEN)))
- return NETDEV_TX_OK;
-
- len = max_t(unsigned int, skb->len, ETH_ZLEN);
- queue = skb_get_queue_mapping(skb);
- netif_stop_subqueue(dev, queue);
-
- desc = &priv->desc_ring[queue];
- if (unlikely(desc->dataflags & CPMAC_OWN)) {
- if (netif_msg_tx_err(priv) && net_ratelimit())
- netdev_warn(dev, "tx dma ring full\n");
-
- return NETDEV_TX_BUSY;
- }
-
- spin_lock(&priv->lock);
- spin_unlock(&priv->lock);
- desc->dataflags = CPMAC_SOP | CPMAC_EOP | CPMAC_OWN;
- desc->skb = skb;
- desc->data_mapping = dma_map_single(&dev->dev, skb->data, len,
- DMA_TO_DEVICE);
- desc->hw_data = (u32)desc->data_mapping;
- desc->datalen = len;
- desc->buflen = len;
- if (unlikely(netif_msg_tx_queued(priv)))
- netdev_dbg(dev, "sending 0x%p, len=%d\n", skb, skb->len);
- if (unlikely(netif_msg_hw(priv)))
- cpmac_dump_desc(dev, desc);
- if (unlikely(netif_msg_pktdata(priv)))
- cpmac_dump_skb(dev, skb);
- cpmac_write(priv->regs, CPMAC_TX_PTR(queue), (u32)desc->mapping);
-
- return NETDEV_TX_OK;
-}
-
-static void cpmac_end_xmit(struct net_device *dev, int queue)
-{
- struct cpmac_desc *desc;
- struct cpmac_priv *priv = netdev_priv(dev);
-
- desc = &priv->desc_ring[queue];
- cpmac_write(priv->regs, CPMAC_TX_ACK(queue), (u32)desc->mapping);
- if (likely(desc->skb)) {
- spin_lock(&priv->lock);
- dev->stats.tx_packets++;
- dev->stats.tx_bytes += desc->skb->len;
- spin_unlock(&priv->lock);
- dma_unmap_single(&dev->dev, desc->data_mapping, desc->skb->len,
- DMA_TO_DEVICE);
-
- if (unlikely(netif_msg_tx_done(priv)))
- netdev_dbg(dev, "sent 0x%p, len=%d\n",
- desc->skb, desc->skb->len);
-
- dev_consume_skb_irq(desc->skb);
- desc->skb = NULL;
- if (__netif_subqueue_stopped(dev, queue))
- netif_wake_subqueue(dev, queue);
- } else {
- if (netif_msg_tx_err(priv) && net_ratelimit())
- netdev_warn(dev, "end_xmit: spurious interrupt\n");
- if (__netif_subqueue_stopped(dev, queue))
- netif_wake_subqueue(dev, queue);
- }
-}
-
-static void cpmac_hw_stop(struct net_device *dev)
-{
- int i;
- struct cpmac_priv *priv = netdev_priv(dev);
- struct plat_cpmac_data *pdata = dev_get_platdata(&priv->pdev->dev);
-
- ar7_device_reset(pdata->reset_bit);
- cpmac_write(priv->regs, CPMAC_RX_CONTROL,
- cpmac_read(priv->regs, CPMAC_RX_CONTROL) & ~1);
- cpmac_write(priv->regs, CPMAC_TX_CONTROL,
- cpmac_read(priv->regs, CPMAC_TX_CONTROL) & ~1);
- for (i = 0; i < 8; i++) {
- cpmac_write(priv->regs, CPMAC_TX_PTR(i), 0);
- cpmac_write(priv->regs, CPMAC_RX_PTR(i), 0);
- }
- cpmac_write(priv->regs, CPMAC_UNICAST_CLEAR, 0xff);
- cpmac_write(priv->regs, CPMAC_RX_INT_CLEAR, 0xff);
- cpmac_write(priv->regs, CPMAC_TX_INT_CLEAR, 0xff);
- cpmac_write(priv->regs, CPMAC_MAC_INT_CLEAR, 0xff);
- cpmac_write(priv->regs, CPMAC_MAC_CONTROL,
- cpmac_read(priv->regs, CPMAC_MAC_CONTROL) & ~MAC_MII);
-}
-
-static void cpmac_hw_start(struct net_device *dev)
-{
- int i;
- struct cpmac_priv *priv = netdev_priv(dev);
- struct plat_cpmac_data *pdata = dev_get_platdata(&priv->pdev->dev);
-
- ar7_device_reset(pdata->reset_bit);
- for (i = 0; i < 8; i++) {
- cpmac_write(priv->regs, CPMAC_TX_PTR(i), 0);
- cpmac_write(priv->regs, CPMAC_RX_PTR(i), 0);
- }
- cpmac_write(priv->regs, CPMAC_RX_PTR(0), priv->rx_head->mapping);
-
- cpmac_write(priv->regs, CPMAC_MBP, MBP_RXSHORT | MBP_RXBCAST |
- MBP_RXMCAST);
- cpmac_write(priv->regs, CPMAC_BUFFER_OFFSET, 0);
- for (i = 0; i < 8; i++)
- cpmac_write(priv->regs, CPMAC_MAC_ADDR_LO(i), dev->dev_addr[5]);
- cpmac_write(priv->regs, CPMAC_MAC_ADDR_MID, dev->dev_addr[4]);
- cpmac_write(priv->regs, CPMAC_MAC_ADDR_HI, dev->dev_addr[0] |
- (dev->dev_addr[1] << 8) | (dev->dev_addr[2] << 16) |
- (dev->dev_addr[3] << 24));
- cpmac_write(priv->regs, CPMAC_MAX_LENGTH, CPMAC_SKB_SIZE);
- cpmac_write(priv->regs, CPMAC_UNICAST_CLEAR, 0xff);
- cpmac_write(priv->regs, CPMAC_RX_INT_CLEAR, 0xff);
- cpmac_write(priv->regs, CPMAC_TX_INT_CLEAR, 0xff);
- cpmac_write(priv->regs, CPMAC_MAC_INT_CLEAR, 0xff);
- cpmac_write(priv->regs, CPMAC_UNICAST_ENABLE, 1);
- cpmac_write(priv->regs, CPMAC_RX_INT_ENABLE, 1);
- cpmac_write(priv->regs, CPMAC_TX_INT_ENABLE, 0xff);
- cpmac_write(priv->regs, CPMAC_MAC_INT_ENABLE, 3);
-
- cpmac_write(priv->regs, CPMAC_RX_CONTROL,
- cpmac_read(priv->regs, CPMAC_RX_CONTROL) | 1);
- cpmac_write(priv->regs, CPMAC_TX_CONTROL,
- cpmac_read(priv->regs, CPMAC_TX_CONTROL) | 1);
- cpmac_write(priv->regs, CPMAC_MAC_CONTROL,
- cpmac_read(priv->regs, CPMAC_MAC_CONTROL) | MAC_MII |
- MAC_FDX);
-}
-
-static void cpmac_clear_rx(struct net_device *dev)
-{
- struct cpmac_priv *priv = netdev_priv(dev);
- struct cpmac_desc *desc;
- int i;
-
- if (unlikely(!priv->rx_head))
- return;
- desc = priv->rx_head;
- for (i = 0; i < priv->ring_size; i++) {
- if ((desc->dataflags & CPMAC_OWN) == 0) {
- if (netif_msg_rx_err(priv) && net_ratelimit())
- netdev_warn(dev, "packet dropped\n");
- if (unlikely(netif_msg_hw(priv)))
- cpmac_dump_desc(dev, desc);
- desc->dataflags = CPMAC_OWN;
- dev->stats.rx_dropped++;
- }
- desc->hw_next = desc->next->mapping;
- desc = desc->next;
- }
- priv->rx_head->prev->hw_next = 0;
-}
-
-static void cpmac_clear_tx(struct net_device *dev)
-{
- struct cpmac_priv *priv = netdev_priv(dev);
- int i;
-
- if (unlikely(!priv->desc_ring))
- return;
- for (i = 0; i < CPMAC_QUEUES; i++) {
- priv->desc_ring[i].dataflags = 0;
- if (priv->desc_ring[i].skb) {
- dev_kfree_skb_any(priv->desc_ring[i].skb);
- priv->desc_ring[i].skb = NULL;
- }
- }
-}
-
-static void cpmac_hw_error(struct work_struct *work)
-{
- struct cpmac_priv *priv =
- container_of(work, struct cpmac_priv, reset_work);
-
- spin_lock(&priv->rx_lock);
- cpmac_clear_rx(priv->dev);
- spin_unlock(&priv->rx_lock);
- cpmac_clear_tx(priv->dev);
- cpmac_hw_start(priv->dev);
- barrier();
- atomic_dec(&priv->reset_pending);
-
- netif_tx_wake_all_queues(priv->dev);
- cpmac_write(priv->regs, CPMAC_MAC_INT_ENABLE, 3);
-}
-
-static void cpmac_check_status(struct net_device *dev)
-{
- struct cpmac_priv *priv = netdev_priv(dev);
-
- u32 macstatus = cpmac_read(priv->regs, CPMAC_MAC_STATUS);
- int rx_channel = (macstatus >> 8) & 7;
- int rx_code = (macstatus >> 12) & 15;
- int tx_channel = (macstatus >> 16) & 7;
- int tx_code = (macstatus >> 20) & 15;
-
- if (rx_code || tx_code) {
- if (netif_msg_drv(priv) && net_ratelimit()) {
- /* Can't find any documentation on what these
- * error codes actually are. So just log them and hope..
- */
- if (rx_code)
- netdev_warn(dev, "host error %d on rx "
- "channel %d (macstatus %08x), resetting\n",
- rx_code, rx_channel, macstatus);
- if (tx_code)
- netdev_warn(dev, "host error %d on tx "
- "channel %d (macstatus %08x), resetting\n",
- tx_code, tx_channel, macstatus);
- }
-
- netif_tx_stop_all_queues(dev);
- cpmac_hw_stop(dev);
- if (schedule_work(&priv->reset_work))
- atomic_inc(&priv->reset_pending);
- if (unlikely(netif_msg_hw(priv)))
- cpmac_dump_regs(dev);
- }
- cpmac_write(priv->regs, CPMAC_MAC_INT_CLEAR, 0xff);
-}
-
-static irqreturn_t cpmac_irq(int irq, void *dev_id)
-{
- struct net_device *dev = dev_id;
- struct cpmac_priv *priv;
- int queue;
- u32 status;
-
- priv = netdev_priv(dev);
-
- status = cpmac_read(priv->regs, CPMAC_MAC_INT_VECTOR);
-
- if (unlikely(netif_msg_intr(priv)))
- netdev_dbg(dev, "interrupt status: 0x%08x\n", status);
-
- if (status & MAC_INT_TX)
- cpmac_end_xmit(dev, (status & 7));
-
- if (status & MAC_INT_RX) {
- queue = (status >> 8) & 7;
- if (napi_schedule_prep(&priv->napi)) {
- cpmac_write(priv->regs, CPMAC_RX_INT_CLEAR, 1 << queue);
- __napi_schedule(&priv->napi);
- }
- }
-
- cpmac_write(priv->regs, CPMAC_MAC_EOI_VECTOR, 0);
-
- if (unlikely(status & (MAC_INT_HOST | MAC_INT_STATUS)))
- cpmac_check_status(dev);
-
- return IRQ_HANDLED;
-}
-
-static void cpmac_tx_timeout(struct net_device *dev, unsigned int txqueue)
-{
- struct cpmac_priv *priv = netdev_priv(dev);
-
- spin_lock(&priv->lock);
- dev->stats.tx_errors++;
- spin_unlock(&priv->lock);
- if (netif_msg_tx_err(priv) && net_ratelimit())
- netdev_warn(dev, "transmit timeout\n");
-
- atomic_inc(&priv->reset_pending);
- barrier();
- cpmac_clear_tx(dev);
- barrier();
- atomic_dec(&priv->reset_pending);
-
- netif_tx_wake_all_queues(priv->dev);
-}
-
-static void cpmac_get_ringparam(struct net_device *dev,
- struct ethtool_ringparam *ring,
- struct kernel_ethtool_ringparam *kernel_ring,
- struct netlink_ext_ack *extack)
-{
- struct cpmac_priv *priv = netdev_priv(dev);
-
- ring->rx_max_pending = 1024;
- ring->rx_mini_max_pending = 1;
- ring->rx_jumbo_max_pending = 1;
- ring->tx_max_pending = 1;
-
- ring->rx_pending = priv->ring_size;
- ring->rx_mini_pending = 1;
- ring->rx_jumbo_pending = 1;
- ring->tx_pending = 1;
-}
-
-static int cpmac_set_ringparam(struct net_device *dev,
- struct ethtool_ringparam *ring,
- struct kernel_ethtool_ringparam *kernel_ring,
- struct netlink_ext_ack *extack)
-{
- struct cpmac_priv *priv = netdev_priv(dev);
-
- if (netif_running(dev))
- return -EBUSY;
- priv->ring_size = ring->rx_pending;
-
- return 0;
-}
-
-static void cpmac_get_drvinfo(struct net_device *dev,
- struct ethtool_drvinfo *info)
-{
- strscpy(info->driver, "cpmac", sizeof(info->driver));
- strscpy(info->version, CPMAC_VERSION, sizeof(info->version));
- snprintf(info->bus_info, sizeof(info->bus_info), "%s", "cpmac");
-}
-
-static const struct ethtool_ops cpmac_ethtool_ops = {
- .get_drvinfo = cpmac_get_drvinfo,
- .get_link = ethtool_op_get_link,
- .get_ringparam = cpmac_get_ringparam,
- .set_ringparam = cpmac_set_ringparam,
- .get_link_ksettings = phy_ethtool_get_link_ksettings,
- .set_link_ksettings = phy_ethtool_set_link_ksettings,
-};
-
-static void cpmac_adjust_link(struct net_device *dev)
-{
- struct cpmac_priv *priv = netdev_priv(dev);
- int new_state = 0;
-
- spin_lock(&priv->lock);
- if (dev->phydev->link) {
- netif_tx_start_all_queues(dev);
- if (dev->phydev->duplex != priv->oldduplex) {
- new_state = 1;
- priv->oldduplex = dev->phydev->duplex;
- }
-
- if (dev->phydev->speed != priv->oldspeed) {
- new_state = 1;
- priv->oldspeed = dev->phydev->speed;
- }
-
- if (!priv->oldlink) {
- new_state = 1;
- priv->oldlink = 1;
- }
- } else if (priv->oldlink) {
- new_state = 1;
- priv->oldlink = 0;
- priv->oldspeed = 0;
- priv->oldduplex = -1;
- }
-
- if (new_state && netif_msg_link(priv) && net_ratelimit())
- phy_print_status(dev->phydev);
-
- spin_unlock(&priv->lock);
-}
-
-static int cpmac_open(struct net_device *dev)
-{
- int i, size, res;
- struct cpmac_priv *priv = netdev_priv(dev);
- struct resource *mem;
- struct cpmac_desc *desc;
- struct sk_buff *skb;
-
- mem = platform_get_resource_byname(priv->pdev, IORESOURCE_MEM, "regs");
- if (!request_mem_region(mem->start, resource_size(mem), dev->name)) {
- if (netif_msg_drv(priv))
- netdev_err(dev, "failed to request registers\n");
-
- res = -ENXIO;
- goto fail_reserve;
- }
-
- priv->regs = ioremap(mem->start, resource_size(mem));
- if (!priv->regs) {
- if (netif_msg_drv(priv))
- netdev_err(dev, "failed to remap registers\n");
-
- res = -ENXIO;
- goto fail_remap;
- }
-
- size = priv->ring_size + CPMAC_QUEUES;
- priv->desc_ring = dma_alloc_coherent(&dev->dev,
- sizeof(struct cpmac_desc) * size,
- &priv->dma_ring,
- GFP_KERNEL);
- if (!priv->desc_ring) {
- res = -ENOMEM;
- goto fail_alloc;
- }
-
- for (i = 0; i < size; i++)
- priv->desc_ring[i].mapping = priv->dma_ring + sizeof(*desc) * i;
-
- priv->rx_head = &priv->desc_ring[CPMAC_QUEUES];
- for (i = 0, desc = priv->rx_head; i < priv->ring_size; i++, desc++) {
- skb = netdev_alloc_skb_ip_align(dev, CPMAC_SKB_SIZE);
- if (unlikely(!skb)) {
- res = -ENOMEM;
- goto fail_desc;
- }
- desc->skb = skb;
- desc->data_mapping = dma_map_single(&dev->dev, skb->data,
- CPMAC_SKB_SIZE,
- DMA_FROM_DEVICE);
- desc->hw_data = (u32)desc->data_mapping;
- desc->buflen = CPMAC_SKB_SIZE;
- desc->dataflags = CPMAC_OWN;
- desc->next = &priv->rx_head[(i + 1) % priv->ring_size];
- desc->next->prev = desc;
- desc->hw_next = (u32)desc->next->mapping;
- }
-
- priv->rx_head->prev->hw_next = (u32)0;
-
- res = request_irq(dev->irq, cpmac_irq, IRQF_SHARED, dev->name, dev);
- if (res) {
- if (netif_msg_drv(priv))
- netdev_err(dev, "failed to obtain irq\n");
-
- goto fail_irq;
- }
-
- atomic_set(&priv->reset_pending, 0);
- INIT_WORK(&priv->reset_work, cpmac_hw_error);
- cpmac_hw_start(dev);
-
- napi_enable(&priv->napi);
- phy_start(dev->phydev);
-
- return 0;
-
-fail_irq:
-fail_desc:
- for (i = 0; i < priv->ring_size; i++) {
- if (priv->rx_head[i].skb) {
- dma_unmap_single(&dev->dev,
- priv->rx_head[i].data_mapping,
- CPMAC_SKB_SIZE,
- DMA_FROM_DEVICE);
- kfree_skb(priv->rx_head[i].skb);
- }
- }
- dma_free_coherent(&dev->dev, sizeof(struct cpmac_desc) * size,
- priv->desc_ring, priv->dma_ring);
-
-fail_alloc:
- iounmap(priv->regs);
-
-fail_remap:
- release_mem_region(mem->start, resource_size(mem));
-
-fail_reserve:
- return res;
-}
-
-static int cpmac_stop(struct net_device *dev)
-{
- int i;
- struct cpmac_priv *priv = netdev_priv(dev);
- struct resource *mem;
-
- netif_tx_stop_all_queues(dev);
-
- cancel_work_sync(&priv->reset_work);
- napi_disable(&priv->napi);
- phy_stop(dev->phydev);
-
- cpmac_hw_stop(dev);
-
- for (i = 0; i < 8; i++)
- cpmac_write(priv->regs, CPMAC_TX_PTR(i), 0);
- cpmac_write(priv->regs, CPMAC_RX_PTR(0), 0);
- cpmac_write(priv->regs, CPMAC_MBP, 0);
-
- free_irq(dev->irq, dev);
- iounmap(priv->regs);
- mem = platform_get_resource_byname(priv->pdev, IORESOURCE_MEM, "regs");
- release_mem_region(mem->start, resource_size(mem));
- priv->rx_head = &priv->desc_ring[CPMAC_QUEUES];
- for (i = 0; i < priv->ring_size; i++) {
- if (priv->rx_head[i].skb) {
- dma_unmap_single(&dev->dev,
- priv->rx_head[i].data_mapping,
- CPMAC_SKB_SIZE,
- DMA_FROM_DEVICE);
- kfree_skb(priv->rx_head[i].skb);
- }
- }
-
- dma_free_coherent(&dev->dev, sizeof(struct cpmac_desc) *
- (CPMAC_QUEUES + priv->ring_size),
- priv->desc_ring, priv->dma_ring);
-
- return 0;
-}
-
-static const struct net_device_ops cpmac_netdev_ops = {
- .ndo_open = cpmac_open,
- .ndo_stop = cpmac_stop,
- .ndo_start_xmit = cpmac_start_xmit,
- .ndo_tx_timeout = cpmac_tx_timeout,
- .ndo_set_rx_mode = cpmac_set_multicast_list,
- .ndo_eth_ioctl = phy_do_ioctl_running,
- .ndo_validate_addr = eth_validate_addr,
- .ndo_set_mac_address = eth_mac_addr,
-};
-
-static int external_switch;
-
-static int cpmac_probe(struct platform_device *pdev)
-{
- int rc, phy_id;
- char mdio_bus_id[MII_BUS_ID_SIZE];
- struct resource *mem;
- struct cpmac_priv *priv;
- struct net_device *dev;
- struct plat_cpmac_data *pdata;
- struct phy_device *phydev = NULL;
-
- pdata = dev_get_platdata(&pdev->dev);
-
- if (external_switch || dumb_switch) {
- strncpy(mdio_bus_id, "fixed-0", MII_BUS_ID_SIZE); /* fixed phys bus */
- phy_id = pdev->id;
- } else {
- for (phy_id = 0; phy_id < PHY_MAX_ADDR; phy_id++) {
- if (!(pdata->phy_mask & (1 << phy_id)))
- continue;
- if (!mdiobus_get_phy(cpmac_mii, phy_id))
- continue;
- strncpy(mdio_bus_id, cpmac_mii->id, MII_BUS_ID_SIZE);
- break;
- }
- }
-
- if (phy_id == PHY_MAX_ADDR) {
- dev_err(&pdev->dev, "no PHY present, falling back "
- "to switch on MDIO bus 0\n");
- strncpy(mdio_bus_id, "fixed-0", MII_BUS_ID_SIZE); /* fixed phys bus */
- phy_id = pdev->id;
- }
- mdio_bus_id[sizeof(mdio_bus_id) - 1] = '\0';
-
- dev = alloc_etherdev_mq(sizeof(*priv), CPMAC_QUEUES);
- if (!dev)
- return -ENOMEM;
-
- SET_NETDEV_DEV(dev, &pdev->dev);
- platform_set_drvdata(pdev, dev);
- priv = netdev_priv(dev);
-
- priv->pdev = pdev;
- mem = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
- if (!mem) {
- rc = -ENODEV;
- goto fail;
- }
-
- dev->irq = platform_get_irq_byname(pdev, "irq");
-
- dev->netdev_ops = &cpmac_netdev_ops;
- dev->ethtool_ops = &cpmac_ethtool_ops;
-
- netif_napi_add(dev, &priv->napi, cpmac_poll);
-
- spin_lock_init(&priv->lock);
- spin_lock_init(&priv->rx_lock);
- priv->dev = dev;
- priv->ring_size = 64;
- priv->msg_enable = netif_msg_init(debug_level, 0xff);
- eth_hw_addr_set(dev, pdata->dev_addr);
-
- snprintf(priv->phy_name, MII_BUS_ID_SIZE, PHY_ID_FMT,
- mdio_bus_id, phy_id);
-
- phydev = phy_connect(dev, priv->phy_name, cpmac_adjust_link,
- PHY_INTERFACE_MODE_MII);
-
- if (IS_ERR(phydev)) {
- if (netif_msg_drv(priv))
- dev_err(&pdev->dev, "Could not attach to PHY\n");
-
- rc = PTR_ERR(phydev);
- goto fail;
- }
-
- rc = register_netdev(dev);
- if (rc) {
- dev_err(&pdev->dev, "Could not register net device\n");
- goto fail;
- }
-
- if (netif_msg_probe(priv)) {
- dev_info(&pdev->dev, "regs: %p, irq: %d, phy: %s, "
- "mac: %pM\n", (void *)mem->start, dev->irq,
- priv->phy_name, dev->dev_addr);
- }
-
- return 0;
-
-fail:
- free_netdev(dev);
- return rc;
-}
-
-static void cpmac_remove(struct platform_device *pdev)
-{
- struct net_device *dev = platform_get_drvdata(pdev);
-
- unregister_netdev(dev);
- free_netdev(dev);
-}
-
-static struct platform_driver cpmac_driver = {
- .driver = {
- .name = "cpmac",
- },
- .probe = cpmac_probe,
- .remove_new = cpmac_remove,
-};
-
-int __init cpmac_init(void)
-{
- u32 mask;
- int i, res;
-
- cpmac_mii = mdiobus_alloc();
- if (cpmac_mii == NULL)
- return -ENOMEM;
-
- cpmac_mii->name = "cpmac-mii";
- cpmac_mii->read = cpmac_mdio_read;
- cpmac_mii->write = cpmac_mdio_write;
- cpmac_mii->reset = cpmac_mdio_reset;
-
- cpmac_mii->priv = ioremap(AR7_REGS_MDIO, 256);
-
- if (!cpmac_mii->priv) {
- pr_err("Can't ioremap mdio registers\n");
- res = -ENXIO;
- goto fail_alloc;
- }
-
- /* FIXME: unhardcode gpio&reset bits */
- ar7_gpio_disable(26);
- ar7_gpio_disable(27);
- ar7_device_reset(AR7_RESET_BIT_CPMAC_LO);
- ar7_device_reset(AR7_RESET_BIT_CPMAC_HI);
- ar7_device_reset(AR7_RESET_BIT_EPHY);
-
- cpmac_mii->reset(cpmac_mii);
-
- for (i = 0; i < 300; i++) {
- mask = cpmac_read(cpmac_mii->priv, CPMAC_MDIO_ALIVE);
- if (mask)
- break;
- else
- msleep(10);
- }
-
- mask &= 0x7fffffff;
- if (mask & (mask - 1)) {
- external_switch = 1;
- mask = 0;
- }
-
- cpmac_mii->phy_mask = ~(mask | 0x80000000);
- snprintf(cpmac_mii->id, MII_BUS_ID_SIZE, "cpmac-1");
-
- res = mdiobus_register(cpmac_mii);
- if (res)
- goto fail_mii;
-
- res = platform_driver_register(&cpmac_driver);
- if (res)
- goto fail_cpmac;
-
- return 0;
-
-fail_cpmac:
- mdiobus_unregister(cpmac_mii);
-
-fail_mii:
- iounmap(cpmac_mii->priv);
-
-fail_alloc:
- mdiobus_free(cpmac_mii);
-
- return res;
-}
-
-void __exit cpmac_exit(void)
-{
- platform_driver_unregister(&cpmac_driver);
- mdiobus_unregister(cpmac_mii);
- iounmap(cpmac_mii->priv);
- mdiobus_free(cpmac_mii);
-}
-
-module_init(cpmac_init);
-module_exit(cpmac_exit);
projects / users / hch / misc.git / commitdiff