--- /dev/null
+/*
+ * Intel IXP4xx Ethernet driver for Linux
+ *
+ * Copyright (C) 2007 Krzysztof Halasa <khc@pm.waw.pl>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 of the GNU General Public License
+ * as published by the Free Software Foundation.
+ *
+ * Ethernet port config (0x00 is not present on IXP42X):
+ *
+ * logical port 0x00 0x10 0x20
+ * NPE 0 (NPE-A) 1 (NPE-B) 2 (NPE-C)
+ * physical PortId 2 0 1
+ * TX queue 23 24 25
+ * RX-free queue 26 27 28
+ * TX-done queue is always 31, per-port RX and TX-ready queues are configurable
+ *
+ *
+ * Queue entries:
+ * bits 0 -> 1 - NPE ID (RX and TX-done)
+ * bits 0 -> 2 - priority (TX, per 802.1D)
+ * bits 3 -> 4 - port ID (user-set?)
+ * bits 5 -> 31 - physical descriptor address
+ */
+
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/dmapool.h>
+#include <linux/etherdevice.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/mii.h>
+#include <linux/platform_device.h>
+#include <asm/arch/npe.h>
+#include <asm/arch/qmgr.h>
+
+#define DEBUG_QUEUES 0
+#define DEBUG_DESC 0
+#define DEBUG_RX 0
+#define DEBUG_TX 0
+#define DEBUG_PKT_BYTES 0
+#define DEBUG_MDIO 0
+#define DEBUG_CLOSE 0
+
+#define DRV_NAME "ixp4xx_eth"
+
+#define MAX_NPES 3
+
+#define RX_DESCS 64 /* also length of all RX queues */
+#define TX_DESCS 16 /* also length of all TX queues */
+#define TXDONE_QUEUE_LEN 64 /* dwords */
+
+#define POOL_ALLOC_SIZE (sizeof(struct desc) * (RX_DESCS + TX_DESCS))
+#define REGS_SIZE 0x1000
+#define MAX_MRU 1536 /* 0x600 */
+#define RX_BUFF_SIZE ALIGN((NET_IP_ALIGN) + MAX_MRU, 4)
+
+#define NAPI_WEIGHT 16
+#define MDIO_INTERVAL (3 * HZ)
+#define MAX_MDIO_RETRIES 100 /* microseconds, typically 30 cycles */
+#define MAX_MII_RESET_RETRIES 100 /* mdio_read() cycles, typically 4 */
+#define MAX_CLOSE_WAIT 1000 /* microseconds, typically 2-3 cycles */
+
+#define NPE_ID(port_id) ((port_id) >> 4)
+#define PHYSICAL_ID(port_id) ((NPE_ID(port_id) + 2) % 3)
+#define TX_QUEUE(port_id) (NPE_ID(port_id) + 23)
+#define RXFREE_QUEUE(port_id) (NPE_ID(port_id) + 26)
+#define TXDONE_QUEUE 31
+
+/* TX Control Registers */
+#define TX_CNTRL0_TX_EN 0x01
+#define TX_CNTRL0_HALFDUPLEX 0x02
+#define TX_CNTRL0_RETRY 0x04
+#define TX_CNTRL0_PAD_EN 0x08
+#define TX_CNTRL0_APPEND_FCS 0x10
+#define TX_CNTRL0_2DEFER 0x20
+#define TX_CNTRL0_RMII 0x40 /* reduced MII */
+#define TX_CNTRL1_RETRIES 0x0F /* 4 bits */
+
+/* RX Control Registers */
+#define RX_CNTRL0_RX_EN 0x01
+#define RX_CNTRL0_PADSTRIP_EN 0x02
+#define RX_CNTRL0_SEND_FCS 0x04
+#define RX_CNTRL0_PAUSE_EN 0x08
+#define RX_CNTRL0_LOOP_EN 0x10
+#define RX_CNTRL0_ADDR_FLTR_EN 0x20
+#define RX_CNTRL0_RX_RUNT_EN 0x40
+#define RX_CNTRL0_BCAST_DIS 0x80
+#define RX_CNTRL1_DEFER_EN 0x01
+
+/* Core Control Register */
+#define CORE_RESET 0x01
+#define CORE_RX_FIFO_FLUSH 0x02
+#define CORE_TX_FIFO_FLUSH 0x04
+#define CORE_SEND_JAM 0x08
+#define CORE_MDC_EN 0x10 /* MDIO using NPE-B ETH-0 only */
+
+#define DEFAULT_TX_CNTRL0 (TX_CNTRL0_TX_EN | TX_CNTRL0_RETRY | \
+ TX_CNTRL0_PAD_EN | TX_CNTRL0_APPEND_FCS | \
+ TX_CNTRL0_2DEFER)
+#define DEFAULT_RX_CNTRL0 RX_CNTRL0_RX_EN
+#define DEFAULT_CORE_CNTRL CORE_MDC_EN
+
+
+/* NPE message codes */
+#define NPE_GETSTATUS 0x00
+#define NPE_EDB_SETPORTADDRESS 0x01
+#define NPE_EDB_GETMACADDRESSDATABASE 0x02
+#define NPE_EDB_SETMACADDRESSSDATABASE 0x03
+#define NPE_GETSTATS 0x04
+#define NPE_RESETSTATS 0x05
+#define NPE_SETMAXFRAMELENGTHS 0x06
+#define NPE_VLAN_SETRXTAGMODE 0x07
+#define NPE_VLAN_SETDEFAULTRXVID 0x08
+#define NPE_VLAN_SETPORTVLANTABLEENTRY 0x09
+#define NPE_VLAN_SETPORTVLANTABLERANGE 0x0A
+#define NPE_VLAN_SETRXQOSENTRY 0x0B
+#define NPE_VLAN_SETPORTIDEXTRACTIONMODE 0x0C
+#define NPE_STP_SETBLOCKINGSTATE 0x0D
+#define NPE_FW_SETFIREWALLMODE 0x0E
+#define NPE_PC_SETFRAMECONTROLDURATIONID 0x0F
+#define NPE_PC_SETAPMACTABLE 0x11
+#define NPE_SETLOOPBACK_MODE 0x12
+#define NPE_PC_SETBSSIDTABLE 0x13
+#define NPE_ADDRESS_FILTER_CONFIG 0x14
+#define NPE_APPENDFCSCONFIG 0x15
+#define NPE_NOTIFY_MAC_RECOVERY_DONE 0x16
+#define NPE_MAC_RECOVERY_START 0x17
+
+
+#ifdef __ARMEB__
+typedef struct sk_buff buffer_t;
+#define free_buffer dev_kfree_skb
+#define free_buffer_irq dev_kfree_skb_irq
+#else
+typedef void buffer_t;
+#define free_buffer kfree
+#define free_buffer_irq kfree
+#endif
+
+struct eth_regs {
+ u32 tx_control[2], __res1[2]; /* 000 */
+ u32 rx_control[2], __res2[2]; /* 010 */
+ u32 random_seed, __res3[3]; /* 020 */
+ u32 partial_empty_threshold, __res4; /* 030 */
+ u32 partial_full_threshold, __res5; /* 038 */
+ u32 tx_start_bytes, __res6[3]; /* 040 */
+ u32 tx_deferral, rx_deferral, __res7[2];/* 050 */
+ u32 tx_2part_deferral[2], __res8[2]; /* 060 */
+ u32 slot_time, __res9[3]; /* 070 */
+ u32 mdio_command[4]; /* 080 */
+ u32 mdio_status[4]; /* 090 */
+ u32 mcast_mask[6], __res10[2]; /* 0A0 */
+ u32 mcast_addr[6], __res11[2]; /* 0C0 */
+ u32 int_clock_threshold, __res12[3]; /* 0E0 */
+ u32 hw_addr[6], __res13[61]; /* 0F0 */
+ u32 core_control; /* 1FC */
+};
+
+struct port {
+ struct resource *mem_res;
+ struct eth_regs __iomem *regs;
+ struct npe *npe;
+ struct net_device *netdev;
+ struct napi_struct napi;
+ struct net_device_stats stat;
+ struct mii_if_info mii;
+ struct delayed_work mdio_thread;
+ struct eth_plat_info *plat;
+ buffer_t *rx_buff_tab[RX_DESCS], *tx_buff_tab[TX_DESCS];
+ struct desc *desc_tab; /* coherent */
+ u32 desc_tab_phys;
+ int id; /* logical port ID */
+ u16 mii_bmcr;
+};
+
+/* NPE message structure */
+struct msg {
+#ifdef __ARMEB__
+ u8 cmd, eth_id, byte2, byte3;
+ u8 byte4, byte5, byte6, byte7;
+#else
+ u8 byte3, byte2, eth_id, cmd;
+ u8 byte7, byte6, byte5, byte4;
+#endif
+};
+
+/* Ethernet packet descriptor */
+struct desc {
+ u32 next; /* pointer to next buffer, unused */
+
+#ifdef __ARMEB__
+ u16 buf_len; /* buffer length */
+ u16 pkt_len; /* packet length */
+ u32 data; /* pointer to data buffer in RAM */
+ u8 dest_id;
+ u8 src_id;
+ u16 flags;
+ u8 qos;
+ u8 padlen;
+ u16 vlan_tci;
+#else
+ u16 pkt_len; /* packet length */
+ u16 buf_len; /* buffer length */
+ u32 data; /* pointer to data buffer in RAM */
+ u16 flags;
+ u8 src_id;
+ u8 dest_id;
+ u16 vlan_tci;
+ u8 padlen;
+ u8 qos;
+#endif
+
+#ifdef __ARMEB__
+ u8 dst_mac_0, dst_mac_1, dst_mac_2, dst_mac_3;
+ u8 dst_mac_4, dst_mac_5, src_mac_0, src_mac_1;
+ u8 src_mac_2, src_mac_3, src_mac_4, src_mac_5;
+#else
+ u8 dst_mac_3, dst_mac_2, dst_mac_1, dst_mac_0;
+ u8 src_mac_1, src_mac_0, dst_mac_5, dst_mac_4;
+ u8 src_mac_5, src_mac_4, src_mac_3, src_mac_2;
+#endif
+};
+
+
+#define rx_desc_phys(port, n) ((port)->desc_tab_phys + \
+ (n) * sizeof(struct desc))
+#define rx_desc_ptr(port, n) (&(port)->desc_tab[n])
+
+#define tx_desc_phys(port, n) ((port)->desc_tab_phys + \
+ ((n) + RX_DESCS) * sizeof(struct desc))
+#define tx_desc_ptr(port, n) (&(port)->desc_tab[(n) + RX_DESCS])
+
+#ifndef __ARMEB__
+static inline void memcpy_swab32(u32 *dest, u32 *src, int cnt)
+{
+ int i;
+ for (i = 0; i < cnt; i++)
+ dest[i] = swab32(src[i]);
+}
+#endif
+
+static spinlock_t mdio_lock;
+static struct eth_regs __iomem *mdio_regs; /* mdio command and status only */
+static int ports_open;
+static struct port *npe_port_tab[MAX_NPES];
+static struct dma_pool *dma_pool;
+
+
+static u16 mdio_cmd(struct net_device *dev, int phy_id, int location,
+ int write, u16 cmd)
+{
+ int cycles = 0;
+
+ if (__raw_readl(&mdio_regs->mdio_command[3]) & 0x80) {
+ printk(KERN_ERR "%s: MII not ready to transmit\n", dev->name);
+ return 0;
+ }
+
+ if (write) {
+ __raw_writel(cmd & 0xFF, &mdio_regs->mdio_command[0]);
+ __raw_writel(cmd >> 8, &mdio_regs->mdio_command[1]);
+ }
+ __raw_writel(((phy_id << 5) | location) & 0xFF,
+ &mdio_regs->mdio_command[2]);
+ __raw_writel((phy_id >> 3) | (write << 2) | 0x80 /* GO */,
+ &mdio_regs->mdio_command[3]);
+
+ while ((cycles < MAX_MDIO_RETRIES) &&
+ (__raw_readl(&mdio_regs->mdio_command[3]) & 0x80)) {
+ udelay(1);
+ cycles++;
+ }
+
+ if (cycles == MAX_MDIO_RETRIES) {
+ printk(KERN_ERR "%s: MII write failed\n", dev->name);
+ return 0;
+ }
+
+#if DEBUG_MDIO
+ printk(KERN_DEBUG "%s: mdio_cmd() took %i cycles\n", dev->name,
+ cycles);
+#endif
+
+ if (write)
+ return 0;
+
+ if (__raw_readl(&mdio_regs->mdio_status[3]) & 0x80) {
+ printk(KERN_ERR "%s: MII read failed\n", dev->name);
+ return 0;
+ }
+
+ return (__raw_readl(&mdio_regs->mdio_status[0]) & 0xFF) |
+ (__raw_readl(&mdio_regs->mdio_status[1]) << 8);
+}
+
+static int mdio_read(struct net_device *dev, int phy_id, int location)
+{
+ unsigned long flags;
+ u16 val;
+
+ spin_lock_irqsave(&mdio_lock, flags);
+ val = mdio_cmd(dev, phy_id, location, 0, 0);
+ spin_unlock_irqrestore(&mdio_lock, flags);
+ return val;
+}
+
+static void mdio_write(struct net_device *dev, int phy_id, int location,
+ int val)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&mdio_lock, flags);
+ mdio_cmd(dev, phy_id, location, 1, val);
+ spin_unlock_irqrestore(&mdio_lock, flags);
+}
+
+static void phy_reset(struct net_device *dev, int phy_id)
+{
+ struct port *port = netdev_priv(dev);
+ int cycles = 0;
+
+ mdio_write(dev, phy_id, MII_BMCR, port->mii_bmcr | BMCR_RESET);
+
+ while (cycles < MAX_MII_RESET_RETRIES) {
+ if (!(mdio_read(dev, phy_id, MII_BMCR) & BMCR_RESET)) {
+#if DEBUG_MDIO
+ printk(KERN_DEBUG "%s: phy_reset() took %i cycles\n",
+ dev->name, cycles);
+#endif
+ return;
+ }
+ udelay(1);
+ cycles++;
+ }
+
+ printk(KERN_ERR "%s: MII reset failed\n", dev->name);
+}
+
+static void eth_set_duplex(struct port *port)
+{
+ if (port->mii.full_duplex)
+ __raw_writel(DEFAULT_TX_CNTRL0 & ~TX_CNTRL0_HALFDUPLEX,
+ &port->regs->tx_control[0]);
+ else
+ __raw_writel(DEFAULT_TX_CNTRL0 | TX_CNTRL0_HALFDUPLEX,
+ &port->regs->tx_control[0]);
+}
+
+
+static void phy_check_media(struct port *port, int init)
+{
+ if (mii_check_media(&port->mii, 1, init))
+ eth_set_duplex(port);
+ if (port->mii.force_media) { /* mii_check_media() doesn't work */
+ struct net_device *dev = port->netdev;
+ int cur_link = mii_link_ok(&port->mii);
+ int prev_link = netif_carrier_ok(dev);
+
+ if (!prev_link && cur_link) {
+ printk(KERN_INFO "%s: link up\n", dev->name);
+ netif_carrier_on(dev);
+ } else if (prev_link && !cur_link) {
+ printk(KERN_INFO "%s: link down\n", dev->name);
+ netif_carrier_off(dev);
+ }
+ }
+}
+
+
+static void mdio_thread(struct work_struct *work)
+{
+ struct port *port = container_of(work, struct port, mdio_thread.work);
+
+ phy_check_media(port, 0);
+ schedule_delayed_work(&port->mdio_thread, MDIO_INTERVAL);
+}
+
+
+static inline void debug_pkt(struct net_device *dev, const char *func,
+ u8 *data, int len)
+{
+#if DEBUG_PKT_BYTES
+ int i;
+
+ printk(KERN_DEBUG "%s: %s(%i) ", dev->name, func, len);
+ for (i = 0; i < len; i++) {
+ if (i >= DEBUG_PKT_BYTES)
+ break;
+ printk("%s%02X",
+ ((i == 6) || (i == 12) || (i >= 14)) ? " " : "",
+ data[i]);
+ }
+ printk("\n");
+#endif
+}
+
+
+static inline void debug_desc(u32 phys, struct desc *desc)
+{
+#if DEBUG_DESC
+ printk(KERN_DEBUG "%X: %X %3X %3X %08X %2X < %2X %4X %X"
+ " %X %X %02X%02X%02X%02X%02X%02X < %02X%02X%02X%02X%02X%02X\n",
+ phys, desc->next, desc->buf_len, desc->pkt_len,
+ desc->data, desc->dest_id, desc->src_id, desc->flags,
+ desc->qos, desc->padlen, desc->vlan_tci,
+ desc->dst_mac_0, desc->dst_mac_1, desc->dst_mac_2,
+ desc->dst_mac_3, desc->dst_mac_4, desc->dst_mac_5,
+ desc->src_mac_0, desc->src_mac_1, desc->src_mac_2,
+ desc->src_mac_3, desc->src_mac_4, desc->src_mac_5);
+#endif
+}
+
+static inline void debug_queue(unsigned int queue, int is_get, u32 phys)
+{
+#if DEBUG_QUEUES
+ static struct {
+ int queue;
+ char *name;
+ } names[] = {
+ { TX_QUEUE(0x10), "TX#0 " },
+ { TX_QUEUE(0x20), "TX#1 " },
+ { TX_QUEUE(0x00), "TX#2 " },
+ { RXFREE_QUEUE(0x10), "RX-free#0 " },
+ { RXFREE_QUEUE(0x20), "RX-free#1 " },
+ { RXFREE_QUEUE(0x00), "RX-free#2 " },
+ { TXDONE_QUEUE, "TX-done " },
+ };
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(names); i++)
+ if (names[i].queue == queue)
+ break;
+
+ printk(KERN_DEBUG "Queue %i %s%s %X\n", queue,
+ i < ARRAY_SIZE(names) ? names[i].name : "",
+ is_get ? "->" : "<-", phys);
+#endif
+}
+
+static inline u32 queue_get_entry(unsigned int queue)
+{
+ u32 phys = qmgr_get_entry(queue);
+ debug_queue(queue, 1, phys);
+ return phys;
+}
+
+static inline int queue_get_desc(unsigned int queue, struct port *port,
+ int is_tx)
+{
+ u32 phys, tab_phys, n_desc;
+ struct desc *tab;
+
+ if (!(phys = queue_get_entry(queue)))
+ return -1;
+
+ phys &= ~0x1F; /* mask out non-address bits */
+ tab_phys = is_tx ? tx_desc_phys(port, 0) : rx_desc_phys(port, 0);
+ tab = is_tx ? tx_desc_ptr(port, 0) : rx_desc_ptr(port, 0);
+ n_desc = (phys - tab_phys) / sizeof(struct desc);
+ BUG_ON(n_desc >= (is_tx ? TX_DESCS : RX_DESCS));
+ debug_desc(phys, &tab[n_desc]);
+ BUG_ON(tab[n_desc].next);
+ return n_desc;
+}
+
+static inline void queue_put_desc(unsigned int queue, u32 phys,
+ struct desc *desc)
+{
+ debug_queue(queue, 0, phys);
+ debug_desc(phys, desc);
+ BUG_ON(phys & 0x1F);
+ qmgr_put_entry(queue, phys);
+ BUG_ON(qmgr_stat_overflow(queue));
+}
+
+
+static inline void dma_unmap_tx(struct port *port, struct desc *desc)
+{
+#ifdef __ARMEB__
+ dma_unmap_single(&port->netdev->dev, desc->data,
+ desc->buf_len, DMA_TO_DEVICE);
+#else
+ dma_unmap_single(&port->netdev->dev, desc->data & ~3,
+ ALIGN((desc->data & 3) + desc->buf_len, 4),
+ DMA_TO_DEVICE);
+#endif
+}
+
+
+static void eth_rx_irq(void *pdev)
+{
+ struct net_device *dev = pdev;
+ struct port *port = netdev_priv(dev);
+
+#if DEBUG_RX
+ printk(KERN_DEBUG "%s: eth_rx_irq\n", dev->name);
+#endif
+ qmgr_disable_irq(port->plat->rxq);
+ netif_rx_schedule(dev, &port->napi);
+}
+
+static int eth_poll(struct napi_struct *napi, int budget)
+{
+ struct port *port = container_of(napi, struct port, napi);
+ struct net_device *dev = port->netdev;
+ unsigned int rxq = port->plat->rxq, rxfreeq = RXFREE_QUEUE(port->id);
+ int received = 0;
+
+#if DEBUG_RX
+ printk(KERN_DEBUG "%s: eth_poll\n", dev->name);
+#endif
+
+ while (received < budget) {
+ struct sk_buff *skb;
+ struct desc *desc;
+ int n;
+#ifdef __ARMEB__
+ struct sk_buff *temp;
+ u32 phys;
+#endif
+
+ if ((n = queue_get_desc(rxq, port, 0)) < 0) {
+ received = 0; /* No packet received */
+#if DEBUG_RX
+ printk(KERN_DEBUG "%s: eth_poll netif_rx_complete\n",
+ dev->name);
+#endif
+ netif_rx_complete(dev, napi);
+ qmgr_enable_irq(rxq);
+ if (!qmgr_stat_empty(rxq) &&
+ netif_rx_reschedule(dev, napi)) {
+#if DEBUG_RX
+ printk(KERN_DEBUG "%s: eth_poll"
+ " netif_rx_reschedule successed\n",
+ dev->name);
+#endif
+ qmgr_disable_irq(rxq);
+ continue;
+ }
+#if DEBUG_RX
+ printk(KERN_DEBUG "%s: eth_poll all done\n",
+ dev->name);
+#endif
+ return 0; /* all work done */
+ }
+
+ desc = rx_desc_ptr(port, n);
+
+#ifdef __ARMEB__
+ if ((skb = netdev_alloc_skb(dev, RX_BUFF_SIZE))) {
+ phys = dma_map_single(&dev->dev, skb->data,
+ RX_BUFF_SIZE, DMA_FROM_DEVICE);
+ if (dma_mapping_error(phys)) {
+ dev_kfree_skb(skb);
+ skb = NULL;
+ }
+ }
+#else
+ skb = netdev_alloc_skb(dev,
+ ALIGN(NET_IP_ALIGN + desc->pkt_len, 4));
+#endif
+
+ if (!skb) {
+ port->stat.rx_dropped++;
+ /* put the desc back on RX-ready queue */
+ desc->buf_len = MAX_MRU;
+ desc->pkt_len = 0;
+ queue_put_desc(rxfreeq, rx_desc_phys(port, n), desc);
+ continue;
+ }
+
+ /* process received frame */
+#ifdef __ARMEB__
+ temp = skb;
+ skb = port->rx_buff_tab[n];
+ dma_unmap_single(&dev->dev, desc->data - NET_IP_ALIGN,
+ RX_BUFF_SIZE, DMA_FROM_DEVICE);
+#else
+ dma_sync_single(&dev->dev, desc->data - NET_IP_ALIGN,
+ RX_BUFF_SIZE, DMA_FROM_DEVICE);
+ memcpy_swab32((u32 *)skb->data, (u32 *)port->rx_buff_tab[n],
+ ALIGN(NET_IP_ALIGN + desc->pkt_len, 4) / 4);
+#endif
+ skb_reserve(skb, NET_IP_ALIGN);
+ skb_put(skb, desc->pkt_len);
+
+ debug_pkt(dev, "eth_poll", skb->data, skb->len);
+
+ skb->protocol = eth_type_trans(skb, dev);
+ dev->last_rx = jiffies;
+ port->stat.rx_packets++;
+ port->stat.rx_bytes += skb->len;
+ netif_receive_skb(skb);
+
+ /* put the new buffer on RX-free queue */
+#ifdef __ARMEB__
+ port->rx_buff_tab[n] = temp;
+ desc->data = phys + NET_IP_ALIGN;
+#endif
+ desc->buf_len = MAX_MRU;
+ desc->pkt_len = 0;
+ queue_put_desc(rxfreeq, rx_desc_phys(port, n), desc);
+ received++;
+ }
+
+#if DEBUG_RX
+ printk(KERN_DEBUG "eth_poll(): end, not all work done\n");
+#endif
+ return received; /* not all work done */
+}
+
+
+static void eth_txdone_irq(void *unused)
+{
+ u32 phys;
+
+#if DEBUG_TX
+ printk(KERN_DEBUG DRV_NAME ": eth_txdone_irq\n");
+#endif
+ while ((phys = queue_get_entry(TXDONE_QUEUE)) != 0) {
+ u32 npe_id, n_desc;
+ struct port *port;
+ struct desc *desc;
+ int start;
+
+ npe_id = phys & 3;
+ BUG_ON(npe_id >= MAX_NPES);
+ port = npe_port_tab[npe_id];
+ BUG_ON(!port);
+ phys &= ~0x1F; /* mask out non-address bits */
+ n_desc = (phys - tx_desc_phys(port, 0)) / sizeof(struct desc);
+ BUG_ON(n_desc >= TX_DESCS);
+ desc = tx_desc_ptr(port, n_desc);
+ debug_desc(phys, desc);
+
+ if (port->tx_buff_tab[n_desc]) { /* not the draining packet */
+ port->stat.tx_packets++;
+ port->stat.tx_bytes += desc->pkt_len;
+
+ dma_unmap_tx(port, desc);
+#if DEBUG_TX
+ printk(KERN_DEBUG "%s: eth_txdone_irq free %p\n",
+ port->netdev->name, port->tx_buff_tab[n_desc]);
+#endif
+ free_buffer_irq(port->tx_buff_tab[n_desc]);
+ port->tx_buff_tab[n_desc] = NULL;
+ }
+
+ start = qmgr_stat_empty(port->plat->txreadyq);
+ queue_put_desc(port->plat->txreadyq, phys, desc);
+ if (start) {
+#if DEBUG_TX
+ printk(KERN_DEBUG "%s: eth_txdone_irq xmit ready\n",
+ port->netdev->name);
+#endif
+ netif_wake_queue(port->netdev);
+ }
+ }
+}
+
+static int eth_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct port *port = netdev_priv(dev);
+ unsigned int txreadyq = port->plat->txreadyq;
+ int len, offset, bytes, n;
+ void *mem;
+ u32 phys;
+ struct desc *desc;
+
+#if DEBUG_TX
+ printk(KERN_DEBUG "%s: eth_xmit\n", dev->name);
+#endif
+
+ if (unlikely(skb->len > MAX_MRU)) {
+ dev_kfree_skb(skb);
+ port->stat.tx_errors++;
+ return NETDEV_TX_OK;
+ }
+
+ debug_pkt(dev, "eth_xmit", skb->data, skb->len);
+
+ len = skb->len;
+#ifdef __ARMEB__
+ offset = 0; /* no need to keep alignment */
+ bytes = len;
+ mem = skb->data;
+#else
+ offset = (int)skb->data & 3; /* keep 32-bit alignment */
+ bytes = ALIGN(offset + len, 4);
+ if (!(mem = kmalloc(bytes, GFP_ATOMIC))) {
+ dev_kfree_skb(skb);
+ port->stat.tx_dropped++;
+ return NETDEV_TX_OK;
+ }
+ memcpy_swab32(mem, (u32 *)((int)skb->data & ~3), bytes / 4);
+ dev_kfree_skb(skb);
+#endif
+
+ phys = dma_map_single(&dev->dev, mem, bytes, DMA_TO_DEVICE);
+ if (dma_mapping_error(phys)) {
+#ifdef __ARMEB__
+ dev_kfree_skb(skb);
+#else
+ kfree(mem);
+#endif
+ port->stat.tx_dropped++;
+ return NETDEV_TX_OK;
+ }
+
+ n = queue_get_desc(txreadyq, port, 1);
+ BUG_ON(n < 0);
+ desc = tx_desc_ptr(port, n);
+
+#ifdef __ARMEB__
+ port->tx_buff_tab[n] = skb;
+#else
+ port->tx_buff_tab[n] = mem;
+#endif
+ desc->data = phys + offset;
+ desc->buf_len = desc->pkt_len = len;
+
+ /* NPE firmware pads short frames with zeros internally */
+ wmb();
+ queue_put_desc(TX_QUEUE(port->id), tx_desc_phys(port, n), desc);
+ dev->trans_start = jiffies;
+
+ if (qmgr_stat_empty(txreadyq)) {
+#if DEBUG_TX
+ printk(KERN_DEBUG "%s: eth_xmit queue full\n", dev->name);
+#endif
+ netif_stop_queue(dev);
+ /* we could miss TX ready interrupt */
+ if (!qmgr_stat_empty(txreadyq)) {
+#if DEBUG_TX
+ printk(KERN_DEBUG "%s: eth_xmit ready again\n",
+ dev->name);
+#endif
+ netif_wake_queue(dev);
+ }
+ }
+
+#if DEBUG_TX
+ printk(KERN_DEBUG "%s: eth_xmit end\n", dev->name);
+#endif
+ return NETDEV_TX_OK;
+}
+
+
+static struct net_device_stats *eth_stats(struct net_device *dev)
+{
+ struct port *port = netdev_priv(dev);
+ return &port->stat;
+}
+
+static void eth_set_mcast_list(struct net_device *dev)
+{
+ struct port *port = netdev_priv(dev);
+ struct dev_mc_list *mclist = dev->mc_list;
+ u8 diffs[ETH_ALEN], *addr;
+ int cnt = dev->mc_count, i;
+
+ if ((dev->flags & IFF_PROMISC) || !mclist || !cnt) {
+ __raw_writel(DEFAULT_RX_CNTRL0 & ~RX_CNTRL0_ADDR_FLTR_EN,
+ &port->regs->rx_control[0]);
+ return;
+ }
+
+ memset(diffs, 0, ETH_ALEN);
+ addr = mclist->dmi_addr; /* first MAC address */
+
+ while (--cnt && (mclist = mclist->next))
+ for (i = 0; i < ETH_ALEN; i++)
+ diffs[i] |= addr[i] ^ mclist->dmi_addr[i];
+
+ for (i = 0; i < ETH_ALEN; i++) {
+ __raw_writel(addr[i], &port->regs->mcast_addr[i]);
+ __raw_writel(~diffs[i], &port->regs->mcast_mask[i]);
+ }
+
+ __raw_writel(DEFAULT_RX_CNTRL0 | RX_CNTRL0_ADDR_FLTR_EN,
+ &port->regs->rx_control[0]);
+}
+
+
+static int eth_ioctl(struct net_device *dev, struct ifreq *req, int cmd)
+{
+ struct port *port = netdev_priv(dev);
+ unsigned int duplex_chg;
+ int err;
+
+ if (!netif_running(dev))
+ return -EINVAL;
+ err = generic_mii_ioctl(&port->mii, if_mii(req), cmd, &duplex_chg);
+ if (duplex_chg)
+ eth_set_duplex(port);
+ return err;
+}
+
+
+static int request_queues(struct port *port)
+{
+ int err;
+
+ err = qmgr_request_queue(RXFREE_QUEUE(port->id), RX_DESCS, 0, 0);
+ if (err)
+ return err;
+
+ err = qmgr_request_queue(port->plat->rxq, RX_DESCS, 0, 0);
+ if (err)
+ goto rel_rxfree;
+
+ err = qmgr_request_queue(TX_QUEUE(port->id), TX_DESCS, 0, 0);
+ if (err)
+ goto rel_rx;
+
+ err = qmgr_request_queue(port->plat->txreadyq, TX_DESCS, 0, 0);
+ if (err)
+ goto rel_tx;
+
+ /* TX-done queue handles skbs sent out by the NPEs */
+ if (!ports_open) {
+ err = qmgr_request_queue(TXDONE_QUEUE, TXDONE_QUEUE_LEN, 0, 0);
+ if (err)
+ goto rel_txready;
+ }
+ return 0;
+
+rel_txready:
+ qmgr_release_queue(port->plat->txreadyq);
+rel_tx:
+ qmgr_release_queue(TX_QUEUE(port->id));
+rel_rx:
+ qmgr_release_queue(port->plat->rxq);
+rel_rxfree:
+ qmgr_release_queue(RXFREE_QUEUE(port->id));
+ printk(KERN_DEBUG "%s: unable to request hardware queues\n",
+ port->netdev->name);
+ return err;
+}
+
+static void release_queues(struct port *port)
+{
+ qmgr_release_queue(RXFREE_QUEUE(port->id));
+ qmgr_release_queue(port->plat->rxq);
+ qmgr_release_queue(TX_QUEUE(port->id));
+ qmgr_release_queue(port->plat->txreadyq);
+
+ if (!ports_open)
+ qmgr_release_queue(TXDONE_QUEUE);
+}
+
+static int init_queues(struct port *port)
+{
+ int i;
+
+ if (!ports_open)
+ if (!(dma_pool = dma_pool_create(DRV_NAME, NULL,
+ POOL_ALLOC_SIZE, 32, 0)))
+ return -ENOMEM;
+
+ if (!(port->desc_tab = dma_pool_alloc(dma_pool, GFP_KERNEL,
+ &port->desc_tab_phys)))
+ return -ENOMEM;
+ memset(port->desc_tab, 0, POOL_ALLOC_SIZE);
+ memset(port->rx_buff_tab, 0, sizeof(port->rx_buff_tab)); /* tables */
+ memset(port->tx_buff_tab, 0, sizeof(port->tx_buff_tab));
+
+ /* Setup RX buffers */
+ for (i = 0; i < RX_DESCS; i++) {
+ struct desc *desc = rx_desc_ptr(port, i);
+ buffer_t *buff; /* skb or kmalloc()ated memory */
+ void *data;
+#ifdef __ARMEB__
+ if (!(buff = netdev_alloc_skb(port->netdev, RX_BUFF_SIZE)))
+ return -ENOMEM;
+ data = buff->data;
+#else
+ if (!(buff = kmalloc(RX_BUFF_SIZE, GFP_KERNEL)))
+ return -ENOMEM;
+ data = buff;
+#endif
+ desc->buf_len = MAX_MRU;
+ desc->data = dma_map_single(&port->netdev->dev, data,
+ RX_BUFF_SIZE, DMA_FROM_DEVICE);
+ if (dma_mapping_error(desc->data)) {
+ free_buffer(buff);
+ return -EIO;
+ }
+ desc->data += NET_IP_ALIGN;
+ port->rx_buff_tab[i] = buff;
+ }
+
+ return 0;
+}
+
+static void destroy_queues(struct port *port)
+{
+ int i;
+
+ if (port->desc_tab) {
+ for (i = 0; i < RX_DESCS; i++) {
+ struct desc *desc = rx_desc_ptr(port, i);
+ buffer_t *buff = port->rx_buff_tab[i];
+ if (buff) {
+ dma_unmap_single(&port->netdev->dev,
+ desc->data - NET_IP_ALIGN,
+ RX_BUFF_SIZE, DMA_FROM_DEVICE);
+ free_buffer(buff);
+ }
+ }
+ for (i = 0; i < TX_DESCS; i++) {
+ struct desc *desc = tx_desc_ptr(port, i);
+ buffer_t *buff = port->tx_buff_tab[i];
+ if (buff) {
+ dma_unmap_tx(port, desc);
+ free_buffer(buff);
+ }
+ }
+ dma_pool_free(dma_pool, port->desc_tab, port->desc_tab_phys);
+ port->desc_tab = NULL;
+ }
+
+ if (!ports_open && dma_pool) {
+ dma_pool_destroy(dma_pool);
+ dma_pool = NULL;
+ }
+}
+
+static int eth_open(struct net_device *dev)
+{
+ struct port *port = netdev_priv(dev);
+ struct npe *npe = port->npe;
+ struct msg msg;
+ int i, err;
+
+ if (!npe_running(npe)) {
+ err = npe_load_firmware(npe, npe_name(npe), &dev->dev);
+ if (err)
+ return err;
+
+ if (npe_recv_message(npe, &msg, "ETH_GET_STATUS")) {
+ printk(KERN_ERR "%s: %s not responding\n", dev->name,
+ npe_name(npe));
+ return -EIO;
+ }
+ }
+
+ mdio_write(dev, port->plat->phy, MII_BMCR, port->mii_bmcr);
+
+ memset(&msg, 0, sizeof(msg));
+ msg.cmd = NPE_VLAN_SETRXQOSENTRY;
+ msg.eth_id = port->id;
+ msg.byte5 = port->plat->rxq | 0x80;
+ msg.byte7 = port->plat->rxq << 4;
+ for (i = 0; i < 8; i++) {
+ msg.byte3 = i;
+ if (npe_send_recv_message(port->npe, &msg, "ETH_SET_RXQ"))
+ return -EIO;
+ }
+
+ msg.cmd = NPE_EDB_SETPORTADDRESS;
+ msg.eth_id = PHYSICAL_ID(port->id);
+ msg.byte2 = dev->dev_addr[0];
+ msg.byte3 = dev->dev_addr[1];
+ msg.byte4 = dev->dev_addr[2];
+ msg.byte5 = dev->dev_addr[3];
+ msg.byte6 = dev->dev_addr[4];
+ msg.byte7 = dev->dev_addr[5];
+ if (npe_send_recv_message(port->npe, &msg, "ETH_SET_MAC"))
+ return -EIO;
+
+ memset(&msg, 0, sizeof(msg));
+ msg.cmd = NPE_FW_SETFIREWALLMODE;
+ msg.eth_id = port->id;
+ if (npe_send_recv_message(port->npe, &msg, "ETH_SET_FIREWALL_MODE"))
+ return -EIO;
+
+ if ((err = request_queues(port)) != 0)
+ return err;
+
+ if ((err = init_queues(port)) != 0) {
+ destroy_queues(port);
+ release_queues(port);
+ return err;
+ }
+
+ for (i = 0; i < ETH_ALEN; i++)
+ __raw_writel(dev->dev_addr[i], &port->regs->hw_addr[i]);
+ __raw_writel(0x08, &port->regs->random_seed);
+ __raw_writel(0x12, &port->regs->partial_empty_threshold);
+ __raw_writel(0x30, &port->regs->partial_full_threshold);
+ __raw_writel(0x08, &port->regs->tx_start_bytes);
+ __raw_writel(0x15, &port->regs->tx_deferral);
+ __raw_writel(0x08, &port->regs->tx_2part_deferral[0]);
+ __raw_writel(0x07, &port->regs->tx_2part_deferral[1]);
+ __raw_writel(0x80, &port->regs->slot_time);
+ __raw_writel(0x01, &port->regs->int_clock_threshold);
+
+ /* Populate queues with buffers, no failure after this point */
+ for (i = 0; i < TX_DESCS; i++)
+ queue_put_desc(port->plat->txreadyq,
+ tx_desc_phys(port, i), tx_desc_ptr(port, i));
+
+ for (i = 0; i < RX_DESCS; i++)
+ queue_put_desc(RXFREE_QUEUE(port->id),
+ rx_desc_phys(port, i), rx_desc_ptr(port, i));
+
+ __raw_writel(TX_CNTRL1_RETRIES, &port->regs->tx_control[1]);
+ __raw_writel(DEFAULT_TX_CNTRL0, &port->regs->tx_control[0]);
+ __raw_writel(0, &port->regs->rx_control[1]);
+ __raw_writel(DEFAULT_RX_CNTRL0, &port->regs->rx_control[0]);
+
+ napi_enable(&port->napi);
+ phy_check_media(port, 1);
+ eth_set_mcast_list(dev);
+ netif_start_queue(dev);
+ schedule_delayed_work(&port->mdio_thread, MDIO_INTERVAL);
+
+ qmgr_set_irq(port->plat->rxq, QUEUE_IRQ_SRC_NOT_EMPTY,
+ eth_rx_irq, dev);
+ if (!ports_open) {
+ qmgr_set_irq(TXDONE_QUEUE, QUEUE_IRQ_SRC_NOT_EMPTY,
+ eth_txdone_irq, NULL);
+ qmgr_enable_irq(TXDONE_QUEUE);
+ }
+ ports_open++;
+ /* we may already have RX data, enables IRQ */
+ netif_rx_schedule(dev, &port->napi);
+ return 0;
+}
+
+static int eth_close(struct net_device *dev)
+{
+ struct port *port = netdev_priv(dev);
+ struct msg msg;
+ int buffs = RX_DESCS; /* allocated RX buffers */
+ int i;
+
+ ports_open--;
+ qmgr_disable_irq(port->plat->rxq);
+ napi_disable(&port->napi);
+ netif_stop_queue(dev);
+
+ while (queue_get_desc(RXFREE_QUEUE(port->id), port, 0) >= 0)
+ buffs--;
+
+ memset(&msg, 0, sizeof(msg));
+ msg.cmd = NPE_SETLOOPBACK_MODE;
+ msg.eth_id = port->id;
+ msg.byte3 = 1;
+ if (npe_send_recv_message(port->npe, &msg, "ETH_ENABLE_LOOPBACK"))
+ printk(KERN_CRIT "%s: unable to enable loopback\n", dev->name);
+
+ i = 0;
+ do { /* drain RX buffers */
+ while (queue_get_desc(port->plat->rxq, port, 0) >= 0)
+ buffs--;
+ if (!buffs)
+ break;
+ if (qmgr_stat_empty(TX_QUEUE(port->id))) {
+ /* we have to inject some packet */
+ struct desc *desc;
+ u32 phys;
+ int n = queue_get_desc(port->plat->txreadyq, port, 1);
+ BUG_ON(n < 0);
+ desc = tx_desc_ptr(port, n);
+ phys = tx_desc_phys(port, n);
+ desc->buf_len = desc->pkt_len = 1;
+ wmb();
+ queue_put_desc(TX_QUEUE(port->id), phys, desc);
+ }
+ udelay(1);
+ } while (++i < MAX_CLOSE_WAIT);
+
+ if (buffs)
+ printk(KERN_CRIT "%s: unable to drain RX queue, %i buffer(s)"
+ " left in NPE\n", dev->name, buffs);
+#if DEBUG_CLOSE
+ if (!buffs)
+ printk(KERN_DEBUG "Draining RX queue took %i cycles\n", i);
+#endif
+
+ buffs = TX_DESCS;
+ while (queue_get_desc(TX_QUEUE(port->id), port, 1) >= 0)
+ buffs--; /* cancel TX */
+
+ i = 0;
+ do {
+ while (queue_get_desc(port->plat->txreadyq, port, 1) >= 0)
+ buffs--;
+ if (!buffs)
+ break;
+ } while (++i < MAX_CLOSE_WAIT);
+
+ if (buffs)
+ printk(KERN_CRIT "%s: unable to drain TX queue, %i buffer(s) "
+ "left in NPE\n", dev->name, buffs);
+#if DEBUG_CLOSE
+ if (!buffs)
+ printk(KERN_DEBUG "Draining TX queues took %i cycles\n", i);
+#endif
+
+ msg.byte3 = 0;
+ if (npe_send_recv_message(port->npe, &msg, "ETH_DISABLE_LOOPBACK"))
+ printk(KERN_CRIT "%s: unable to disable loopback\n",
+ dev->name);
+
+ port->mii_bmcr = mdio_read(dev, port->plat->phy, MII_BMCR) &
+ ~(BMCR_RESET | BMCR_PDOWN); /* may have been altered */
+ mdio_write(dev, port->plat->phy, MII_BMCR,
+ port->mii_bmcr | BMCR_PDOWN);
+
+ if (!ports_open)
+ qmgr_disable_irq(TXDONE_QUEUE);
+ cancel_rearming_delayed_work(&port->mdio_thread);
+ destroy_queues(port);
+ release_queues(port);
+ return 0;
+}
+
+static int __devinit eth_init_one(struct platform_device *pdev)
+{
+ struct port *port;
+ struct net_device *dev;
+ struct eth_plat_info *plat = pdev->dev.platform_data;
+ u32 regs_phys;
+ int err;
+
+ if (!(dev = alloc_etherdev(sizeof(struct port))))
+ return -ENOMEM;
+
+ SET_NETDEV_DEV(dev, &pdev->dev);
+ port = netdev_priv(dev);
+ port->netdev = dev;
+ port->id = pdev->id;
+
+ switch (port->id) {
+ case IXP4XX_ETH_NPEA:
+ port->regs = (struct eth_regs __iomem *)IXP4XX_EthA_BASE_VIRT;
+ regs_phys = IXP4XX_EthA_BASE_PHYS;
+ break;
+ case IXP4XX_ETH_NPEB:
+ port->regs = (struct eth_regs __iomem *)IXP4XX_EthB_BASE_VIRT;
+ regs_phys = IXP4XX_EthB_BASE_PHYS;
+ break;
+ case IXP4XX_ETH_NPEC:
+ port->regs = (struct eth_regs __iomem *)IXP4XX_EthC_BASE_VIRT;
+ regs_phys = IXP4XX_EthC_BASE_PHYS;
+ break;
+ default:
+ err = -ENOSYS;
+ goto err_free;
+ }
+
+ dev->open = eth_open;
+ dev->hard_start_xmit = eth_xmit;
+ dev->stop = eth_close;
+ dev->get_stats = eth_stats;
+ dev->do_ioctl = eth_ioctl;
+ dev->set_multicast_list = eth_set_mcast_list;
+ dev->tx_queue_len = 100;
+
+ netif_napi_add(dev, &port->napi, eth_poll, NAPI_WEIGHT);
+
+ if (!(port->npe = npe_request(NPE_ID(port->id)))) {
+ err = -EIO;
+ goto err_free;
+ }
+
+ if (register_netdev(dev)) {
+ err = -EIO;
+ goto err_npe_rel;
+ }
+
+ port->mem_res = request_mem_region(regs_phys, REGS_SIZE, dev->name);
+ if (!port->mem_res) {
+ err = -EBUSY;
+ goto err_unreg;
+ }
+
+ port->plat = plat;
+ npe_port_tab[NPE_ID(port->id)] = port;
+ memcpy(dev->dev_addr, plat->hwaddr, ETH_ALEN);
+
+ platform_set_drvdata(pdev, dev);
+
+ __raw_writel(DEFAULT_CORE_CNTRL | CORE_RESET,
+ &port->regs->core_control);
+ udelay(50);
+ __raw_writel(DEFAULT_CORE_CNTRL, &port->regs->core_control);
+ udelay(50);
+
+ port->mii.dev = dev;
+ port->mii.mdio_read = mdio_read;
+ port->mii.mdio_write = mdio_write;
+ port->mii.phy_id = plat->phy;
+ port->mii.phy_id_mask = 0x1F;
+ port->mii.reg_num_mask = 0x1F;
+
+ printk(KERN_INFO "%s: MII PHY %i on %s\n", dev->name, plat->phy,
+ npe_name(port->npe));
+
+ phy_reset(dev, plat->phy);
+ port->mii_bmcr = mdio_read(dev, plat->phy, MII_BMCR) &
+ ~(BMCR_RESET | BMCR_PDOWN);
+ mdio_write(dev, plat->phy, MII_BMCR, port->mii_bmcr | BMCR_PDOWN);
+
+ INIT_DELAYED_WORK(&port->mdio_thread, mdio_thread);
+ return 0;
+
+err_unreg:
+ unregister_netdev(dev);
+err_npe_rel:
+ npe_release(port->npe);
+err_free:
+ free_netdev(dev);
+ return err;
+}
+
+static int __devexit eth_remove_one(struct platform_device *pdev)
+{
+ struct net_device *dev = platform_get_drvdata(pdev);
+ struct port *port = netdev_priv(dev);
+
+ unregister_netdev(dev);
+ npe_port_tab[NPE_ID(port->id)] = NULL;
+ platform_set_drvdata(pdev, NULL);
+ npe_release(port->npe);
+ release_resource(port->mem_res);
+ free_netdev(dev);
+ return 0;
+}
+
+static struct platform_driver drv = {
+ .driver.name = DRV_NAME,
+ .probe = eth_init_one,
+ .remove = eth_remove_one,
+};
+
+static int __init eth_init_module(void)
+{
+ if (!(ixp4xx_read_feature_bits() & IXP4XX_FEATURE_NPEB_ETH0))
+ return -ENOSYS;
+
+ /* All MII PHY accesses use NPE-B Ethernet registers */
+ spin_lock_init(&mdio_lock);
+ mdio_regs = (struct eth_regs __iomem *)IXP4XX_EthB_BASE_VIRT;
+ __raw_writel(DEFAULT_CORE_CNTRL, &mdio_regs->core_control);
+
+ return platform_driver_register(&drv);
+}
+
+static void __exit eth_cleanup_module(void)
+{
+ platform_driver_unregister(&drv);
+}
+
+MODULE_AUTHOR("Krzysztof Halasa");
+MODULE_DESCRIPTION("Intel IXP4xx Ethernet driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:ixp4xx_eth");
+module_init(eth_init_module);
+module_exit(eth_cleanup_module);
projects / linux-2.6 / commitdiff