spider_net.c 66.0 KB
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/*
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 * Network device driver for Cell Processor-Based Blade and Celleb platform
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 *
 * (C) Copyright IBM Corp. 2005
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 * (C) Copyright 2006 TOSHIBA CORPORATION
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 *
 * Authors : Utz Bacher <utz.bacher@de.ibm.com>
 *           Jens Osterkamp <Jens.Osterkamp@de.ibm.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/compiler.h>
#include <linux/crc32.h>
#include <linux/delay.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/firmware.h>
#include <linux/if_vlan.h>
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#include <linux/in.h>
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#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/ip.h>
#include <linux/kernel.h>
#include <linux/mii.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/device.h>
#include <linux/pci.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <linux/tcp.h>
#include <linux/types.h>
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#include <linux/vmalloc.h>
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#include <linux/wait.h>
#include <linux/workqueue.h>
#include <asm/bitops.h>
#include <asm/pci-bridge.h>
#include <net/checksum.h>

#include "spider_net.h"

MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com> and Jens Osterkamp " \
	      "<Jens.Osterkamp@de.ibm.com>");
MODULE_DESCRIPTION("Spider Southbridge Gigabit Ethernet driver");
MODULE_LICENSE("GPL");
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MODULE_VERSION(VERSION);
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static int rx_descriptors = SPIDER_NET_RX_DESCRIPTORS_DEFAULT;
static int tx_descriptors = SPIDER_NET_TX_DESCRIPTORS_DEFAULT;

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module_param(rx_descriptors, int, 0444);
module_param(tx_descriptors, int, 0444);
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MODULE_PARM_DESC(rx_descriptors, "number of descriptors used " \
		 "in rx chains");
MODULE_PARM_DESC(tx_descriptors, "number of descriptors used " \
		 "in tx chain");

char spider_net_driver_name[] = "spidernet";

static struct pci_device_id spider_net_pci_tbl[] = {
	{ PCI_VENDOR_ID_TOSHIBA_2, PCI_DEVICE_ID_TOSHIBA_SPIDER_NET,
	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
	{ 0, }
};

MODULE_DEVICE_TABLE(pci, spider_net_pci_tbl);

/**
 * spider_net_read_reg - reads an SMMIO register of a card
 * @card: device structure
 * @reg: register to read from
 *
 * returns the content of the specified SMMIO register.
 */
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static inline u32
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spider_net_read_reg(struct spider_net_card *card, u32 reg)
{
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	/* We use the powerpc specific variants instead of readl_be() because
	 * we know spidernet is not a real PCI device and we can thus avoid the
	 * performance hit caused by the PCI workarounds.
	 */
	return in_be32(card->regs + reg);
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}

/**
 * spider_net_write_reg - writes to an SMMIO register of a card
 * @card: device structure
 * @reg: register to write to
 * @value: value to write into the specified SMMIO register
 */
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static inline void
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spider_net_write_reg(struct spider_net_card *card, u32 reg, u32 value)
{
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	/* We use the powerpc specific variants instead of writel_be() because
	 * we know spidernet is not a real PCI device and we can thus avoid the
	 * performance hit caused by the PCI workarounds.
	 */
	out_be32(card->regs + reg, value);
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}

/** spider_net_write_phy - write to phy register
 * @netdev: adapter to be written to
 * @mii_id: id of MII
 * @reg: PHY register
 * @val: value to be written to phy register
 *
 * spider_net_write_phy_register writes to an arbitrary PHY
 * register via the spider GPCWOPCMD register. We assume the queue does
 * not run full (not more than 15 commands outstanding).
 **/
static void
spider_net_write_phy(struct net_device *netdev, int mii_id,
		     int reg, int val)
{
	struct spider_net_card *card = netdev_priv(netdev);
	u32 writevalue;

	writevalue = ((u32)mii_id << 21) |
		((u32)reg << 16) | ((u32)val);

	spider_net_write_reg(card, SPIDER_NET_GPCWOPCMD, writevalue);
}

/** spider_net_read_phy - read from phy register
 * @netdev: network device to be read from
 * @mii_id: id of MII
 * @reg: PHY register
 *
 * Returns value read from PHY register
 *
 * spider_net_write_phy reads from an arbitrary PHY
 * register via the spider GPCROPCMD register
 **/
static int
spider_net_read_phy(struct net_device *netdev, int mii_id, int reg)
{
	struct spider_net_card *card = netdev_priv(netdev);
	u32 readvalue;

	readvalue = ((u32)mii_id << 21) | ((u32)reg << 16);
	spider_net_write_reg(card, SPIDER_NET_GPCROPCMD, readvalue);

	/* we don't use semaphores to wait for an SPIDER_NET_GPROPCMPINT
	 * interrupt, as we poll for the completion of the read operation
	 * in spider_net_read_phy. Should take about 50 us */
	do {
		readvalue = spider_net_read_reg(card, SPIDER_NET_GPCROPCMD);
	} while (readvalue & SPIDER_NET_GPREXEC);

	readvalue &= SPIDER_NET_GPRDAT_MASK;

	return readvalue;
}

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/**
 * spider_net_setup_aneg - initial auto-negotiation setup
 * @card: device structure
 **/
static void
spider_net_setup_aneg(struct spider_net_card *card)
{
	struct mii_phy *phy = &card->phy;
	u32 advertise = 0;
	u16 bmcr, bmsr, stat1000, estat;

	bmcr     = spider_net_read_phy(card->netdev, phy->mii_id, MII_BMCR);
	bmsr     = spider_net_read_phy(card->netdev, phy->mii_id, MII_BMSR);
	stat1000 = spider_net_read_phy(card->netdev, phy->mii_id, MII_STAT1000);
	estat    = spider_net_read_phy(card->netdev, phy->mii_id, MII_ESTATUS);

	if (bmsr & BMSR_10HALF)
		advertise |= ADVERTISED_10baseT_Half;
	if (bmsr & BMSR_10FULL)
		advertise |= ADVERTISED_10baseT_Full;
	if (bmsr & BMSR_100HALF)
		advertise |= ADVERTISED_100baseT_Half;
	if (bmsr & BMSR_100FULL)
		advertise |= ADVERTISED_100baseT_Full;

	if ((bmsr & BMSR_ESTATEN) && (estat & ESTATUS_1000_TFULL))
		advertise |= SUPPORTED_1000baseT_Full;
	if ((bmsr & BMSR_ESTATEN) && (estat & ESTATUS_1000_THALF))
		advertise |= SUPPORTED_1000baseT_Half;

	mii_phy_probe(phy, phy->mii_id);
	phy->def->ops->setup_aneg(phy, advertise);

}

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/**
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 * spider_net_rx_irq_off - switch off rx irq on this spider card
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 * @card: device structure
 *
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 * switches off rx irq by masking them out in the GHIINTnMSK register
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 */
static void
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spider_net_rx_irq_off(struct spider_net_card *card)
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{
	u32 regvalue;

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	regvalue = SPIDER_NET_INT0_MASK_VALUE & (~SPIDER_NET_RXINT);
	spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK, regvalue);
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}

/**
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 * spider_net_rx_irq_on - switch on rx irq on this spider card
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 * @card: device structure
 *
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 * switches on rx irq by enabling them in the GHIINTnMSK register
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 */
static void
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spider_net_rx_irq_on(struct spider_net_card *card)
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{
	u32 regvalue;

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	regvalue = SPIDER_NET_INT0_MASK_VALUE | SPIDER_NET_RXINT;
	spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK, regvalue);
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}

/**
 * spider_net_set_promisc - sets the unicast address or the promiscuous mode
 * @card: card structure
 *
 * spider_net_set_promisc sets the unicast destination address filter and
 * thus either allows for non-promisc mode or promisc mode
 */
static void
spider_net_set_promisc(struct spider_net_card *card)
{
	u32 macu, macl;
	struct net_device *netdev = card->netdev;

	if (netdev->flags & IFF_PROMISC) {
		/* clear destination entry 0 */
		spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR, 0);
		spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR + 0x04, 0);
		spider_net_write_reg(card, SPIDER_NET_GMRUA0FIL15R,
				     SPIDER_NET_PROMISC_VALUE);
	} else {
		macu = netdev->dev_addr[0];
		macu <<= 8;
		macu |= netdev->dev_addr[1];
		memcpy(&macl, &netdev->dev_addr[2], sizeof(macl));

		macu |= SPIDER_NET_UA_DESCR_VALUE;
		spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR, macu);
		spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR + 0x04, macl);
		spider_net_write_reg(card, SPIDER_NET_GMRUA0FIL15R,
				     SPIDER_NET_NONPROMISC_VALUE);
	}
}

/**
 * spider_net_get_mac_address - read mac address from spider card
 * @card: device structure
 *
 * reads MAC address from GMACUNIMACU and GMACUNIMACL registers
 */
static int
spider_net_get_mac_address(struct net_device *netdev)
{
	struct spider_net_card *card = netdev_priv(netdev);
	u32 macl, macu;

	macl = spider_net_read_reg(card, SPIDER_NET_GMACUNIMACL);
	macu = spider_net_read_reg(card, SPIDER_NET_GMACUNIMACU);

	netdev->dev_addr[0] = (macu >> 24) & 0xff;
	netdev->dev_addr[1] = (macu >> 16) & 0xff;
	netdev->dev_addr[2] = (macu >> 8) & 0xff;
	netdev->dev_addr[3] = macu & 0xff;
	netdev->dev_addr[4] = (macl >> 8) & 0xff;
	netdev->dev_addr[5] = macl & 0xff;

	if (!is_valid_ether_addr(&netdev->dev_addr[0]))
		return -EINVAL;

	return 0;
}

/**
 * spider_net_get_descr_status -- returns the status of a descriptor
 * @descr: descriptor to look at
 *
 * returns the status as in the dmac_cmd_status field of the descriptor
 */
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static inline int
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spider_net_get_descr_status(struct spider_net_descr *descr)
{
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	return descr->dmac_cmd_status & SPIDER_NET_DESCR_IND_PROC_MASK;
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}

/**
 * spider_net_free_chain - free descriptor chain
 * @card: card structure
 * @chain: address of chain
 *
 */
static void
spider_net_free_chain(struct spider_net_card *card,
		      struct spider_net_descr_chain *chain)
{
	struct spider_net_descr *descr;

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	descr = chain->ring;
	do {
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		descr->bus_addr = 0;
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		descr->next_descr_addr = 0;
		descr = descr->next;
	} while (descr != chain->ring);

	dma_free_coherent(&card->pdev->dev, chain->num_desc,
	    chain->ring, chain->dma_addr);
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}

/**
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 * spider_net_init_chain - alloc and link descriptor chain
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 * @card: card structure
 * @chain: address of chain
 *
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 * We manage a circular list that mirrors the hardware structure,
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 * except that the hardware uses bus addresses.
 *
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 * Returns 0 on success, <0 on failure
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 */
static int
spider_net_init_chain(struct spider_net_card *card,
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		       struct spider_net_descr_chain *chain)
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{
	int i;
	struct spider_net_descr *descr;
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	dma_addr_t buf;
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	size_t alloc_size;
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	alloc_size = chain->num_desc * sizeof (struct spider_net_descr);
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	chain->ring = dma_alloc_coherent(&card->pdev->dev, alloc_size,
		&chain->dma_addr, GFP_KERNEL);
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	if (!chain->ring)
		return -ENOMEM;
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	descr = chain->ring;
	memset(descr, 0, alloc_size);

	/* Set up the hardware pointers in each descriptor */
	buf = chain->dma_addr;
	for (i=0; i < chain->num_desc; i++, descr++) {
		descr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE;
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		descr->bus_addr = buf;
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		descr->next_descr_addr = 0;
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		descr->next = descr + 1;
		descr->prev = descr - 1;

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		buf += sizeof(struct spider_net_descr);
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	}
	/* do actual circular list */
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	(descr-1)->next = chain->ring;
	chain->ring->prev = descr-1;
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	spin_lock_init(&chain->lock);
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	chain->head = chain->ring;
	chain->tail = chain->ring;
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	return 0;
}

/**
 * spider_net_free_rx_chain_contents - frees descr contents in rx chain
 * @card: card structure
 *
 * returns 0 on success, <0 on failure
 */
static void
spider_net_free_rx_chain_contents(struct spider_net_card *card)
{
	struct spider_net_descr *descr;

	descr = card->rx_chain.head;
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	do {
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		if (descr->skb) {
			dev_kfree_skb(descr->skb);
			pci_unmap_single(card->pdev, descr->buf_addr,
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					 SPIDER_NET_MAX_FRAME,
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					 PCI_DMA_BIDIRECTIONAL);
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		}
		descr = descr->next;
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	} while (descr != card->rx_chain.head);
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}

/**
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 * spider_net_prepare_rx_descr - Reinitialize RX descriptor
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 * @card: card structure
 * @descr: descriptor to re-init
 *
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 * Return 0 on succes, <0 on failure.
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 *
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 * Allocates a new rx skb, iommu-maps it and attaches it to the
 * descriptor. Mark the descriptor as activated, ready-to-use.
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 */
static int
spider_net_prepare_rx_descr(struct spider_net_card *card,
			    struct spider_net_descr *descr)
{
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	dma_addr_t buf;
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	int offset;
	int bufsize;

	/* we need to round up the buffer size to a multiple of 128 */
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	bufsize = (SPIDER_NET_MAX_FRAME + SPIDER_NET_RXBUF_ALIGN - 1) &
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		(~(SPIDER_NET_RXBUF_ALIGN - 1));

	/* and we need to have it 128 byte aligned, therefore we allocate a
	 * bit more */
	/* allocate an skb */
	descr->skb = dev_alloc_skb(bufsize + SPIDER_NET_RXBUF_ALIGN - 1);
	if (!descr->skb) {
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		if (netif_msg_rx_err(card) && net_ratelimit())
			pr_err("Not enough memory to allocate rx buffer\n");
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		card->spider_stats.alloc_rx_skb_error++;
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		return -ENOMEM;
	}
	descr->buf_size = bufsize;
	descr->result_size = 0;
	descr->valid_size = 0;
	descr->data_status = 0;
	descr->data_error = 0;

	offset = ((unsigned long)descr->skb->data) &
		(SPIDER_NET_RXBUF_ALIGN - 1);
	if (offset)
		skb_reserve(descr->skb, SPIDER_NET_RXBUF_ALIGN - offset);
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	/* iommu-map the skb */
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	buf = pci_map_single(card->pdev, descr->skb->data,
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			SPIDER_NET_MAX_FRAME, PCI_DMA_FROMDEVICE);
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	descr->buf_addr = buf;
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	if (pci_dma_mapping_error(buf)) {
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		dev_kfree_skb_any(descr->skb);
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		if (netif_msg_rx_err(card) && net_ratelimit())
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			pr_err("Could not iommu-map rx buffer\n");
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		card->spider_stats.rx_iommu_map_error++;
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		descr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE;
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	} else {
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		descr->next_descr_addr = 0;
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		wmb();
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		descr->dmac_cmd_status = SPIDER_NET_DESCR_CARDOWNED |
					 SPIDER_NET_DMAC_NOINTR_COMPLETE;
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		wmb();
		descr->prev->next_descr_addr = descr->bus_addr;
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	}

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	return 0;
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}

/**
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 * spider_net_enable_rxchtails - sets RX dmac chain tail addresses
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 * @card: card structure
 *
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 * spider_net_enable_rxchtails sets the RX DMAC chain tail adresses in the
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 * chip by writing to the appropriate register. DMA is enabled in
 * spider_net_enable_rxdmac.
 */
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static inline void
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spider_net_enable_rxchtails(struct spider_net_card *card)
{
	/* assume chain is aligned correctly */
	spider_net_write_reg(card, SPIDER_NET_GDADCHA ,
			     card->rx_chain.tail->bus_addr);
}

/**
 * spider_net_enable_rxdmac - enables a receive DMA controller
 * @card: card structure
 *
 * spider_net_enable_rxdmac enables the DMA controller by setting RX_DMA_EN
 * in the GDADMACCNTR register
 */
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static inline void
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spider_net_enable_rxdmac(struct spider_net_card *card)
{
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	wmb();
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	spider_net_write_reg(card, SPIDER_NET_GDADMACCNTR,
			     SPIDER_NET_DMA_RX_VALUE);
}

/**
 * spider_net_refill_rx_chain - refills descriptors/skbs in the rx chains
 * @card: card structure
 *
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 * refills descriptors in the rx chain: allocates skbs and iommu-maps them.
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 */
static void
spider_net_refill_rx_chain(struct spider_net_card *card)
{
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	struct spider_net_descr_chain *chain = &card->rx_chain;
	unsigned long flags;
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	/* one context doing the refill (and a second context seeing that
	 * and omitting it) is ok. If called by NAPI, we'll be called again
	 * as spider_net_decode_one_descr is called several times. If some
	 * interrupt calls us, the NAPI is about to clean up anyway. */
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	if (!spin_trylock_irqsave(&chain->lock, flags))
		return;

	while (spider_net_get_descr_status(chain->head) ==
			SPIDER_NET_DESCR_NOT_IN_USE) {
		if (spider_net_prepare_rx_descr(card, chain->head))
			break;
		chain->head = chain->head->next;
	}
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	spin_unlock_irqrestore(&chain->lock, flags);
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}

/**
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 * spider_net_alloc_rx_skbs - Allocates rx skbs in rx descriptor chains
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 * @card: card structure
 *
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 * Returns 0 on success, <0 on failure.
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 */
static int
spider_net_alloc_rx_skbs(struct spider_net_card *card)
{
	int result;
	struct spider_net_descr_chain *chain;

	result = -ENOMEM;

	chain = &card->rx_chain;
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	/* Put at least one buffer into the chain. if this fails,
	 * we've got a problem. If not, spider_net_refill_rx_chain
	 * will do the rest at the end of this function. */
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	if (spider_net_prepare_rx_descr(card, chain->head))
		goto error;
	else
		chain->head = chain->head->next;

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	/* This will allocate the rest of the rx buffers;
	 * if not, it's business as usual later on. */
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	spider_net_refill_rx_chain(card);
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	spider_net_enable_rxdmac(card);
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	return 0;

error:
	spider_net_free_rx_chain_contents(card);
	return result;
}

/**
 * spider_net_get_multicast_hash - generates hash for multicast filter table
 * @addr: multicast address
 *
 * returns the hash value.
 *
 * spider_net_get_multicast_hash calculates a hash value for a given multicast
 * address, that is used to set the multicast filter tables
 */
static u8
spider_net_get_multicast_hash(struct net_device *netdev, __u8 *addr)
{
	u32 crc;
	u8 hash;
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	char addr_for_crc[ETH_ALEN] = { 0, };
	int i, bit;

	for (i = 0; i < ETH_ALEN * 8; i++) {
		bit = (addr[i / 8] >> (i % 8)) & 1;
		addr_for_crc[ETH_ALEN - 1 - i / 8] += bit << (7 - (i % 8));
	}
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	crc = crc32_be(~0, addr_for_crc, netdev->addr_len);
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	hash = (crc >> 27);
	hash <<= 3;
	hash |= crc & 7;
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	hash &= 0xff;
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	return hash;
}

/**
 * spider_net_set_multi - sets multicast addresses and promisc flags
 * @netdev: interface device structure
 *
 * spider_net_set_multi configures multicast addresses as needed for the
 * netdev interface. It also sets up multicast, allmulti and promisc
 * flags appropriately
 */
static void
spider_net_set_multi(struct net_device *netdev)
{
	struct dev_mc_list *mc;
	u8 hash;
	int i;
	u32 reg;
	struct spider_net_card *card = netdev_priv(netdev);
	unsigned long bitmask[SPIDER_NET_MULTICAST_HASHES / BITS_PER_LONG] =
		{0, };

	spider_net_set_promisc(card);

	if (netdev->flags & IFF_ALLMULTI) {
		for (i = 0; i < SPIDER_NET_MULTICAST_HASHES; i++) {
			set_bit(i, bitmask);
		}
		goto write_hash;
	}

	/* well, we know, what the broadcast hash value is: it's xfd
	hash = spider_net_get_multicast_hash(netdev, netdev->broadcast); */
	set_bit(0xfd, bitmask);

	for (mc = netdev->mc_list; mc; mc = mc->next) {
		hash = spider_net_get_multicast_hash(netdev, mc->dmi_addr);
		set_bit(hash, bitmask);
	}

write_hash:
	for (i = 0; i < SPIDER_NET_MULTICAST_HASHES / 4; i++) {
		reg = 0;
		if (test_bit(i * 4, bitmask))
			reg += 0x08;
		reg <<= 8;
		if (test_bit(i * 4 + 1, bitmask))
			reg += 0x08;
		reg <<= 8;
		if (test_bit(i * 4 + 2, bitmask))
			reg += 0x08;
		reg <<= 8;
		if (test_bit(i * 4 + 3, bitmask))
			reg += 0x08;

		spider_net_write_reg(card, SPIDER_NET_GMRMHFILnR + i * 4, reg);
	}
}

/**
 * spider_net_disable_rxdmac - disables the receive DMA controller
 * @card: card structure
 *
 * spider_net_disable_rxdmac terminates processing on the DMA controller by
 * turing off DMA and issueing a force end
 */
static void
spider_net_disable_rxdmac(struct spider_net_card *card)
{
	spider_net_write_reg(card, SPIDER_NET_GDADMACCNTR,
			     SPIDER_NET_DMA_RX_FEND_VALUE);
}

/**
 * spider_net_prepare_tx_descr - fill tx descriptor with skb data
 * @card: card structure
 * @descr: descriptor structure to fill out
 * @skb: packet to use
 *
 * returns 0 on success, <0 on failure.
 *
 * fills out the descriptor structure with skb data and len. Copies data,
 * if needed (32bit DMA!)
 */
static int
spider_net_prepare_tx_descr(struct spider_net_card *card,
			    struct sk_buff *skb)
{
681
	struct spider_net_descr *descr;
682
	dma_addr_t buf;
683
	unsigned long flags;
684

685
	buf = pci_map_single(card->pdev, skb->data, skb->len, PCI_DMA_TODEVICE);
686
	if (pci_dma_mapping_error(buf)) {
687
		if (netif_msg_tx_err(card) && net_ratelimit())
688
			pr_err("could not iommu-map packet (%p, %i). "
689
				  "Dropping packet\n", skb->data, skb->len);
690
		card->spider_stats.tx_iommu_map_error++;
691 692 693
		return -ENOMEM;
	}

694 695 696 697
	spin_lock_irqsave(&card->tx_chain.lock, flags);
	descr = card->tx_chain.head;
	card->tx_chain.head = descr->next;

698
	descr->buf_addr = buf;
699
	descr->buf_size = skb->len;
700
	descr->next_descr_addr = 0;
701 702 703
	descr->skb = skb;
	descr->data_status = 0;

704 705
	descr->dmac_cmd_status =
			SPIDER_NET_DESCR_CARDOWNED | SPIDER_NET_DMAC_NOCS;
706 707
	spin_unlock_irqrestore(&card->tx_chain.lock, flags);

708 709 710 711 712 713 714 715 716 717
	if (skb->protocol == htons(ETH_P_IP))
		switch (skb->nh.iph->protocol) {
		case IPPROTO_TCP:
			descr->dmac_cmd_status |= SPIDER_NET_DMAC_TCP;
			break;
		case IPPROTO_UDP:
			descr->dmac_cmd_status |= SPIDER_NET_DMAC_UDP;
			break;
		}

718
	/* Chain the bus address, so that the DMA engine finds this descr. */
719 720
	descr->prev->next_descr_addr = descr->bus_addr;

721
	card->netdev->trans_start = jiffies; /* set netdev watchdog timer */
722 723 724
	return 0;
}

725
static int
726 727
spider_net_set_low_watermark(struct spider_net_card *card)
{
728
	unsigned long flags;
729 730 731 732 733
	int status;
	int cnt=0;
	int i;
	struct spider_net_descr *descr = card->tx_chain.tail;

734 735
	/* Measure the length of the queue. Measurement does not
	 * need to be precise -- does not need a lock. */
736 737 738 739 740 741 742 743 744
	while (descr != card->tx_chain.head) {
		status = descr->dmac_cmd_status & SPIDER_NET_DESCR_NOT_IN_USE;
		if (status == SPIDER_NET_DESCR_NOT_IN_USE)
			break;
		descr = descr->next;
		cnt++;
	}

	/* If TX queue is short, don't even bother with interrupts */
L
Linas Vepstas 已提交
745
	if (cnt < card->tx_chain.num_desc/4)
746
		return cnt;
747 748 749 750 751 752 753 754

	/* Set low-watermark 3/4th's of the way into the queue. */
	descr = card->tx_chain.tail;
	cnt = (cnt*3)/4;
	for (i=0;i<cnt; i++)
		descr = descr->next;

	/* Set the new watermark, clear the old watermark */
755
	spin_lock_irqsave(&card->tx_chain.lock, flags);
756 757 758 759 760
	descr->dmac_cmd_status |= SPIDER_NET_DESCR_TXDESFLG;
	if (card->low_watermark && card->low_watermark != descr)
		card->low_watermark->dmac_cmd_status =
		     card->low_watermark->dmac_cmd_status & ~SPIDER_NET_DESCR_TXDESFLG;
	card->low_watermark = descr;
761
	spin_unlock_irqrestore(&card->tx_chain.lock, flags);
762
	return cnt;
763 764
}

765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780
/**
 * spider_net_release_tx_chain - processes sent tx descriptors
 * @card: adapter structure
 * @brutal: if set, don't care about whether descriptor seems to be in use
 *
 * returns 0 if the tx ring is empty, otherwise 1.
 *
 * spider_net_release_tx_chain releases the tx descriptors that spider has
 * finished with (if non-brutal) or simply release tx descriptors (if brutal).
 * If some other context is calling this function, we return 1 so that we're
 * scheduled again (if we were scheduled) and will not loose initiative.
 */
static int
spider_net_release_tx_chain(struct spider_net_card *card, int brutal)
{
	struct spider_net_descr_chain *chain = &card->tx_chain;
781 782 783 784
	struct spider_net_descr *descr;
	struct sk_buff *skb;
	u32 buf_addr;
	unsigned long flags;
785 786 787
	int status;

	while (chain->tail != chain->head) {
788 789 790 791
		spin_lock_irqsave(&chain->lock, flags);
		descr = chain->tail;

		status = spider_net_get_descr_status(descr);
792 793 794
		switch (status) {
		case SPIDER_NET_DESCR_COMPLETE:
			card->netdev_stats.tx_packets++;
795
			card->netdev_stats.tx_bytes += descr->skb->len;
796 797 798
			break;

		case SPIDER_NET_DESCR_CARDOWNED:
799 800
			if (!brutal) {
				spin_unlock_irqrestore(&chain->lock, flags);
801
				return 1;
802 803
			}

804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819
			/* fallthrough, if we release the descriptors
			 * brutally (then we don't care about
			 * SPIDER_NET_DESCR_CARDOWNED) */

		case SPIDER_NET_DESCR_RESPONSE_ERROR:
		case SPIDER_NET_DESCR_PROTECTION_ERROR:
		case SPIDER_NET_DESCR_FORCE_END:
			if (netif_msg_tx_err(card))
				pr_err("%s: forcing end of tx descriptor "
				       "with status x%02x\n",
				       card->netdev->name, status);
			card->netdev_stats.tx_errors++;
			break;

		default:
			card->netdev_stats.tx_dropped++;
820 821
			if (!brutal) {
				spin_unlock_irqrestore(&chain->lock, flags);
822
				return 1;
823
			}
824
		}
825

826 827 828 829 830 831 832 833
		chain->tail = descr->next;
		descr->dmac_cmd_status |= SPIDER_NET_DESCR_NOT_IN_USE;
		skb = descr->skb;
		buf_addr = descr->buf_addr;
		spin_unlock_irqrestore(&chain->lock, flags);

		/* unmap the skb */
		if (skb) {
834 835
			pci_unmap_single(card->pdev, buf_addr, skb->len,
					PCI_DMA_TODEVICE);
836 837 838
			dev_kfree_skb(skb);
		}
	}
839 840 841 842 843 844 845 846
	return 0;
}

/**
 * spider_net_kick_tx_dma - enables TX DMA processing
 * @card: card structure
 * @descr: descriptor address to enable TX processing at
 *
847 848 849 850 851 852
 * This routine will start the transmit DMA running if
 * it is not already running. This routine ned only be
 * called when queueing a new packet to an empty tx queue.
 * Writes the current tx chain head as start address
 * of the tx descriptor chain and enables the transmission
 * DMA engine.
853
 */
854 855
static inline void
spider_net_kick_tx_dma(struct spider_net_card *card)
856
{
857
	struct spider_net_descr *descr;
858

859 860 861
	if (spider_net_read_reg(card, SPIDER_NET_GDTDMACCNTR) &
			SPIDER_NET_TX_DMA_EN)
		goto out;
862

863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879
	descr = card->tx_chain.tail;
	for (;;) {
		if (spider_net_get_descr_status(descr) ==
				SPIDER_NET_DESCR_CARDOWNED) {
			spider_net_write_reg(card, SPIDER_NET_GDTDCHA,
					descr->bus_addr);
			spider_net_write_reg(card, SPIDER_NET_GDTDMACCNTR,
					SPIDER_NET_DMA_TX_VALUE);
			break;
		}
		if (descr == card->tx_chain.head)
			break;
		descr = descr->next;
	}

out:
	mod_timer(&card->tx_timer, jiffies + SPIDER_NET_TX_TIMER);
880 881 882 883 884 885 886
}

/**
 * spider_net_xmit - transmits a frame over the device
 * @skb: packet to send out
 * @netdev: interface device structure
 *
887
 * returns 0 on success, !0 on failure
888 889 890 891
 */
static int
spider_net_xmit(struct sk_buff *skb, struct net_device *netdev)
{
892
	int cnt;
893
	struct spider_net_card *card = netdev_priv(netdev);
894 895
	struct spider_net_descr_chain *chain = &card->tx_chain;

896
	spider_net_release_tx_chain(card, 0);
897

898 899
	if ((chain->head->next == chain->tail->prev) ||
	   (spider_net_prepare_tx_descr(card, skb) != 0)) {
900

901
		card->netdev_stats.tx_dropped++;
902 903
		netif_stop_queue(netdev);
		return NETDEV_TX_BUSY;
904
	}
905

906 907 908
	cnt = spider_net_set_low_watermark(card);
	if (cnt < 5)
		spider_net_kick_tx_dma(card);
909
	return NETDEV_TX_OK;
910
}
911

912 913 914 915
/**
 * spider_net_cleanup_tx_ring - cleans up the TX ring
 * @card: card structure
 *
916 917 918 919
 * spider_net_cleanup_tx_ring is called by either the tx_timer
 * or from the NAPI polling routine.
 * This routine releases resources associted with transmitted
 * packets, including updating the queue tail pointer.
920 921 922 923 924
 */
static void
spider_net_cleanup_tx_ring(struct spider_net_card *card)
{
	if ((spider_net_release_tx_chain(card, 0) != 0) &&
925
	    (card->netdev->flags & IFF_UP)) {
926
		spider_net_kick_tx_dma(card);
927 928
		netif_wake_queue(card->netdev);
	}
929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953
}

/**
 * spider_net_do_ioctl - called for device ioctls
 * @netdev: interface device structure
 * @ifr: request parameter structure for ioctl
 * @cmd: command code for ioctl
 *
 * returns 0 on success, <0 on failure. Currently, we have no special ioctls.
 * -EOPNOTSUPP is returned, if an unknown ioctl was requested
 */
static int
spider_net_do_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
{
	switch (cmd) {
	default:
		return -EOPNOTSUPP;
	}
}

/**
 * spider_net_pass_skb_up - takes an skb from a descriptor and passes it on
 * @descr: descriptor to process
 * @card: card structure
 *
L
Linas Vepstas 已提交
954 955
 * Fills out skb structure and passes the data to the stack.
 * The descriptor state is not changed.
956
 */
957
static void
958
spider_net_pass_skb_up(struct spider_net_descr *descr,
959
		       struct spider_net_card *card)
960 961 962 963 964 965 966 967 968
{
	struct sk_buff *skb;
	struct net_device *netdev;
	u32 data_status, data_error;

	data_status = descr->data_status;
	data_error = descr->data_error;
	netdev = card->netdev;

969
	skb = descr->skb;
970 971 972 973 974 975 976 977 978 979 980
	skb->dev = netdev;
	skb_put(skb, descr->valid_size);

	/* the card seems to add 2 bytes of junk in front
	 * of the ethernet frame */
#define SPIDER_MISALIGN		2
	skb_pull(skb, SPIDER_MISALIGN);
	skb->protocol = eth_type_trans(skb, netdev);

	/* checksum offload */
	if (card->options.rx_csum) {
981 982 983
		if ( ( (data_status & SPIDER_NET_DATA_STATUS_CKSUM_MASK) ==
		       SPIDER_NET_DATA_STATUS_CKSUM_MASK) &&
		     !(data_error & SPIDER_NET_DATA_ERR_CKSUM_MASK))
984 985 986
			skb->ip_summed = CHECKSUM_UNNECESSARY;
		else
			skb->ip_summed = CHECKSUM_NONE;
987
	} else
988 989 990 991 992 993 994 995 996
		skb->ip_summed = CHECKSUM_NONE;

	if (data_status & SPIDER_NET_VLAN_PACKET) {
		/* further enhancements: HW-accel VLAN
		 * vlan_hwaccel_receive_skb
		 */
	}

	/* pass skb up to stack */
997
	netif_receive_skb(skb);
998 999 1000 1001 1002 1003

	/* update netdevice statistics */
	card->netdev_stats.rx_packets++;
	card->netdev_stats.rx_bytes += skb->len;
}

1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031
#ifdef DEBUG
static void show_rx_chain(struct spider_net_card *card)
{
	struct spider_net_descr_chain *chain = &card->rx_chain;
	struct spider_net_descr *start= chain->tail;
	struct spider_net_descr *descr= start;
	int status;

	int cnt = 0;
	int cstat = spider_net_get_descr_status(descr);
	printk(KERN_INFO "RX chain tail at descr=%ld\n",
	     (start - card->descr) - card->tx_chain.num_desc);
	status = cstat;
	do
	{
		status = spider_net_get_descr_status(descr);
		if (cstat != status) {
			printk(KERN_INFO "Have %d descrs with stat=x%08x\n", cnt, cstat);
			cstat = status;
			cnt = 0;
		}
		cnt ++;
		descr = descr->next;
	} while (descr != start);
	printk(KERN_INFO "Last %d descrs with stat=x%08x\n", cnt, cstat);
}
#endif

1032
/**
1033
 * spider_net_decode_one_descr - processes an rx descriptor
1034 1035
 * @card: card structure
 *
1036
 * Returns 1 if a packet has been sent to the stack, otherwise 0
1037
 *
1038
 * Processes an rx descriptor by iommu-unmapping the data buffer and passing
1039 1040
 * the packet up to the stack. This function is called in softirq
 * context, e.g. either bottom half from interrupt or NAPI polling context
1041 1042
 */
static int
1043
spider_net_decode_one_descr(struct spider_net_card *card)
1044
{
1045 1046 1047
	struct spider_net_descr_chain *chain = &card->rx_chain;
	struct spider_net_descr *descr = chain->tail;
	int status;
1048 1049 1050

	status = spider_net_get_descr_status(descr);

L
Linas Vepstas 已提交
1051 1052 1053
	/* Nothing in the descriptor, or ring must be empty */
	if ((status == SPIDER_NET_DESCR_CARDOWNED) ||
	    (status == SPIDER_NET_DESCR_NOT_IN_USE))
1054
		return 0;
1055

1056
	/* descriptor definitively used -- move on tail */
1057 1058
	chain->tail = descr->next;

L
Linas Vepstas 已提交
1059 1060 1061 1062
	/* unmap descriptor */
	pci_unmap_single(card->pdev, descr->buf_addr,
			SPIDER_NET_MAX_FRAME, PCI_DMA_FROMDEVICE);

1063 1064 1065 1066 1067 1068 1069
	if ( (status == SPIDER_NET_DESCR_RESPONSE_ERROR) ||
	     (status == SPIDER_NET_DESCR_PROTECTION_ERROR) ||
	     (status == SPIDER_NET_DESCR_FORCE_END) ) {
		if (netif_msg_rx_err(card))
			pr_err("%s: dropping RX descriptor with state %d\n",
			       card->netdev->name, status);
		card->netdev_stats.rx_dropped++;
1070
		goto bad_desc;
1071 1072 1073 1074
	}

	if ( (status != SPIDER_NET_DESCR_COMPLETE) &&
	     (status != SPIDER_NET_DESCR_FRAME_END) ) {
1075
		if (netif_msg_rx_err(card))
L
Linas Vepstas 已提交
1076
			pr_err("%s: RX descriptor with unkown state %d\n",
1077
			       card->netdev->name, status);
1078
		card->spider_stats.rx_desc_unk_state++;
1079
		goto bad_desc;
1080 1081
	}

1082 1083 1084 1085 1086 1087 1088
	/* The cases we'll throw away the packet immediately */
	if (descr->data_error & SPIDER_NET_DESTROY_RX_FLAGS) {
		if (netif_msg_rx_err(card))
			pr_err("%s: error in received descriptor found, "
			       "data_status=x%08x, data_error=x%08x\n",
			       card->netdev->name,
			       descr->data_status, descr->data_error);
1089
		goto bad_desc;
1090 1091
	}

1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109
	if (descr->dmac_cmd_status & 0xfefe) {
		pr_err("%s: bad status, cmd_status=x%08x\n",
			       card->netdev->name,
			       descr->dmac_cmd_status);
		pr_err("buf_addr=x%08x\n", descr->buf_addr);
		pr_err("buf_size=x%08x\n", descr->buf_size);
		pr_err("next_descr_addr=x%08x\n", descr->next_descr_addr);
		pr_err("result_size=x%08x\n", descr->result_size);
		pr_err("valid_size=x%08x\n", descr->valid_size);
		pr_err("data_status=x%08x\n", descr->data_status);
		pr_err("data_error=x%08x\n", descr->data_error);
		pr_err("bus_addr=x%08x\n", descr->bus_addr);
		pr_err("which=%ld\n", descr - card->rx_chain.ring);

		card->spider_stats.rx_desc_error++;
		goto bad_desc;
	}

1110 1111
	/* Ok, we've got a packet in descr */
	spider_net_pass_skb_up(descr, card);
1112
	descr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE;
1113 1114 1115 1116 1117 1118
	return 1;

bad_desc:
	dev_kfree_skb_irq(descr->skb);
	descr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE;
	return 0;
1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139
}

/**
 * spider_net_poll - NAPI poll function called by the stack to return packets
 * @netdev: interface device structure
 * @budget: number of packets we can pass to the stack at most
 *
 * returns 0 if no more packets available to the driver/stack. Returns 1,
 * if the quota is exceeded, but the driver has still packets.
 *
 * spider_net_poll returns all packets from the rx descriptors to the stack
 * (using netif_receive_skb). If all/enough packets are up, the driver
 * reenables interrupts and returns 0. If not, 1 is returned.
 */
static int
spider_net_poll(struct net_device *netdev, int *budget)
{
	struct spider_net_card *card = netdev_priv(netdev);
	int packets_to_do, packets_done = 0;
	int no_more_packets = 0;

1140
	spider_net_cleanup_tx_ring(card);
1141 1142 1143
	packets_to_do = min(*budget, netdev->quota);

	while (packets_to_do) {
1144
		if (spider_net_decode_one_descr(card)) {
1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155
			packets_done++;
			packets_to_do--;
		} else {
			/* no more packets for the stack */
			no_more_packets = 1;
			break;
		}
	}

	netdev->quota -= packets_done;
	*budget -= packets_done;
1156
	spider_net_refill_rx_chain(card);
L
Linas Vepstas 已提交
1157
	spider_net_enable_rxdmac(card);
1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251

	/* if all packets are in the stack, enable interrupts and return 0 */
	/* if not, return 1 */
	if (no_more_packets) {
		netif_rx_complete(netdev);
		spider_net_rx_irq_on(card);
		return 0;
	}

	return 1;
}

/**
 * spider_net_vlan_rx_reg - initializes VLAN structures in the driver and card
 * @netdev: interface device structure
 * @grp: vlan_group structure that is registered (NULL on destroying interface)
 */
static void
spider_net_vlan_rx_reg(struct net_device *netdev, struct vlan_group *grp)
{
	/* further enhancement... yet to do */
	return;
}

/**
 * spider_net_vlan_rx_add - adds VLAN id to the card filter
 * @netdev: interface device structure
 * @vid: VLAN id to add
 */
static void
spider_net_vlan_rx_add(struct net_device *netdev, uint16_t vid)
{
	/* further enhancement... yet to do */
	/* add vid to card's VLAN filter table */
	return;
}

/**
 * spider_net_vlan_rx_kill - removes VLAN id to the card filter
 * @netdev: interface device structure
 * @vid: VLAN id to remove
 */
static void
spider_net_vlan_rx_kill(struct net_device *netdev, uint16_t vid)
{
	/* further enhancement... yet to do */
	/* remove vid from card's VLAN filter table */
}

/**
 * spider_net_get_stats - get interface statistics
 * @netdev: interface device structure
 *
 * returns the interface statistics residing in the spider_net_card struct
 */
static struct net_device_stats *
spider_net_get_stats(struct net_device *netdev)
{
	struct spider_net_card *card = netdev_priv(netdev);
	struct net_device_stats *stats = &card->netdev_stats;
	return stats;
}

/**
 * spider_net_change_mtu - changes the MTU of an interface
 * @netdev: interface device structure
 * @new_mtu: new MTU value
 *
 * returns 0 on success, <0 on failure
 */
static int
spider_net_change_mtu(struct net_device *netdev, int new_mtu)
{
	/* no need to re-alloc skbs or so -- the max mtu is about 2.3k
	 * and mtu is outbound only anyway */
	if ( (new_mtu < SPIDER_NET_MIN_MTU ) ||
		(new_mtu > SPIDER_NET_MAX_MTU) )
		return -EINVAL;
	netdev->mtu = new_mtu;
	return 0;
}

/**
 * spider_net_set_mac - sets the MAC of an interface
 * @netdev: interface device structure
 * @ptr: pointer to new MAC address
 *
 * Returns 0 on success, <0 on failure. Currently, we don't support this
 * and will always return EOPNOTSUPP.
 */
static int
spider_net_set_mac(struct net_device *netdev, void *p)
{
	struct spider_net_card *card = netdev_priv(netdev);
1252
	u32 macl, macu, regvalue;
1253 1254 1255 1256 1257
	struct sockaddr *addr = p;

	if (!is_valid_ether_addr(addr->sa_data))
		return -EADDRNOTAVAIL;

1258 1259 1260 1261 1262 1263
	/* switch off GMACTPE and GMACRPE */
	regvalue = spider_net_read_reg(card, SPIDER_NET_GMACOPEMD);
	regvalue &= ~((1 << 5) | (1 << 6));
	spider_net_write_reg(card, SPIDER_NET_GMACOPEMD, regvalue);

	/* write mac */
1264 1265 1266 1267 1268 1269
	macu = (addr->sa_data[0]<<24) + (addr->sa_data[1]<<16) +
		(addr->sa_data[2]<<8) + (addr->sa_data[3]);
	macl = (addr->sa_data[4]<<8) + (addr->sa_data[5]);
	spider_net_write_reg(card, SPIDER_NET_GMACUNIMACU, macu);
	spider_net_write_reg(card, SPIDER_NET_GMACUNIMACL, macl);

1270 1271 1272 1273 1274
	/* switch GMACTPE and GMACRPE back on */
	regvalue = spider_net_read_reg(card, SPIDER_NET_GMACOPEMD);
	regvalue |= ((1 << 5) | (1 << 6));
	spider_net_write_reg(card, SPIDER_NET_GMACOPEMD, regvalue);

1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285
	spider_net_set_promisc(card);

	/* look up, whether we have been successful */
	if (spider_net_get_mac_address(netdev))
		return -EADDRNOTAVAIL;
	if (memcmp(netdev->dev_addr,addr->sa_data,netdev->addr_len))
		return -EADDRNOTAVAIL;

	return 0;
}

1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312
/**
 * spider_net_link_reset
 * @netdev: net device structure
 *
 * This is called when the PHY_LINK signal is asserted. For the blade this is
 * not connected so we should never get here.
 *
 */
static void
spider_net_link_reset(struct net_device *netdev)
{

	struct spider_net_card *card = netdev_priv(netdev);

	del_timer_sync(&card->aneg_timer);

	/* clear interrupt, block further interrupts */
	spider_net_write_reg(card, SPIDER_NET_GMACST,
			     spider_net_read_reg(card, SPIDER_NET_GMACST));
	spider_net_write_reg(card, SPIDER_NET_GMACINTEN, 0);

	/* reset phy and setup aneg */
	spider_net_setup_aneg(card);
	mod_timer(&card->aneg_timer, jiffies + SPIDER_NET_ANEG_TIMER);

}

1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345
/**
 * spider_net_handle_error_irq - handles errors raised by an interrupt
 * @card: card structure
 * @status_reg: interrupt status register 0 (GHIINT0STS)
 *
 * spider_net_handle_error_irq treats or ignores all error conditions
 * found when an interrupt is presented
 */
static void
spider_net_handle_error_irq(struct spider_net_card *card, u32 status_reg)
{
	u32 error_reg1, error_reg2;
	u32 i;
	int show_error = 1;

	error_reg1 = spider_net_read_reg(card, SPIDER_NET_GHIINT1STS);
	error_reg2 = spider_net_read_reg(card, SPIDER_NET_GHIINT2STS);

	/* check GHIINT0STS ************************************/
	if (status_reg)
		for (i = 0; i < 32; i++)
			if (status_reg & (1<<i))
				switch (i)
	{
	/* let error_reg1 and error_reg2 evaluation decide, what to do
	case SPIDER_NET_PHYINT:
	case SPIDER_NET_GMAC2INT:
	case SPIDER_NET_GMAC1INT:
	case SPIDER_NET_GFIFOINT:
	case SPIDER_NET_DMACINT:
	case SPIDER_NET_GSYSINT:
		break; */

1346 1347 1348 1349
	case SPIDER_NET_GIPSINT:
		show_error = 0;
		break;

1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407
	case SPIDER_NET_GPWOPCMPINT:
		/* PHY write operation completed */
		show_error = 0;
		break;
	case SPIDER_NET_GPROPCMPINT:
		/* PHY read operation completed */
		/* we don't use semaphores, as we poll for the completion
		 * of the read operation in spider_net_read_phy. Should take
		 * about 50 us */
		show_error = 0;
		break;
	case SPIDER_NET_GPWFFINT:
		/* PHY command queue full */
		if (netif_msg_intr(card))
			pr_err("PHY write queue full\n");
		show_error = 0;
		break;

	/* case SPIDER_NET_GRMDADRINT: not used. print a message */
	/* case SPIDER_NET_GRMARPINT: not used. print a message */
	/* case SPIDER_NET_GRMMPINT: not used. print a message */

	case SPIDER_NET_GDTDEN0INT:
		/* someone has set TX_DMA_EN to 0 */
		show_error = 0;
		break;

	case SPIDER_NET_GDDDEN0INT: /* fallthrough */
	case SPIDER_NET_GDCDEN0INT: /* fallthrough */
	case SPIDER_NET_GDBDEN0INT: /* fallthrough */
	case SPIDER_NET_GDADEN0INT:
		/* someone has set RX_DMA_EN to 0 */
		show_error = 0;
		break;

	/* RX interrupts */
	case SPIDER_NET_GDDFDCINT:
	case SPIDER_NET_GDCFDCINT:
	case SPIDER_NET_GDBFDCINT:
	case SPIDER_NET_GDAFDCINT:
	/* case SPIDER_NET_GDNMINT: not used. print a message */
	/* case SPIDER_NET_GCNMINT: not used. print a message */
	/* case SPIDER_NET_GBNMINT: not used. print a message */
	/* case SPIDER_NET_GANMINT: not used. print a message */
	/* case SPIDER_NET_GRFNMINT: not used. print a message */
		show_error = 0;
		break;

	/* TX interrupts */
	case SPIDER_NET_GDTFDCINT:
		show_error = 0;
		break;
	case SPIDER_NET_GTTEDINT:
		show_error = 0;
		break;
	case SPIDER_NET_GDTDCEINT:
		/* chain end. If a descriptor should be sent, kick off
		 * tx dma
1408
		if (card->tx_chain.tail != card->tx_chain.head)
1409
			spider_net_kick_tx_dma(card);
1410 1411
		*/
		show_error = 0;
1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424
		break;

	/* case SPIDER_NET_G1TMCNTINT: not used. print a message */
	/* case SPIDER_NET_GFREECNTINT: not used. print a message */
	}

	/* check GHIINT1STS ************************************/
	if (error_reg1)
		for (i = 0; i < 32; i++)
			if (error_reg1 & (1<<i))
				switch (i)
	{
	case SPIDER_NET_GTMFLLINT:
1425
		if (netif_msg_intr(card) && net_ratelimit())
1426 1427 1428
			pr_err("Spider TX RAM full\n");
		show_error = 0;
		break;
1429 1430 1431 1432
	case SPIDER_NET_GRFDFLLINT: /* fallthrough */
	case SPIDER_NET_GRFCFLLINT: /* fallthrough */
	case SPIDER_NET_GRFBFLLINT: /* fallthrough */
	case SPIDER_NET_GRFAFLLINT: /* fallthrough */
1433
	case SPIDER_NET_GRMFLLINT:
1434
		if (netif_msg_intr(card) && net_ratelimit())
1435
			pr_err("Spider RX RAM full, incoming packets "
1436 1437
			       "might be discarded!\n");
		spider_net_rx_irq_off(card);
1438
		netif_rx_schedule(card->netdev);
1439
		show_error = 0;
1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452
		break;

	/* case SPIDER_NET_GTMSHTINT: problem, print a message */
	case SPIDER_NET_GDTINVDINT:
		/* allrighty. tx from previous descr ok */
		show_error = 0;
		break;

	/* chain end */
	case SPIDER_NET_GDDDCEINT: /* fallthrough */
	case SPIDER_NET_GDCDCEINT: /* fallthrough */
	case SPIDER_NET_GDBDCEINT: /* fallthrough */
	case SPIDER_NET_GDADCEINT:
1453
		if (netif_msg_intr(card) && net_ratelimit())
1454 1455
			pr_err("got descriptor chain end interrupt, "
			       "restarting DMAC %c.\n",
1456
			       'D'-(i-SPIDER_NET_GDDDCEINT)/3);
1457
		spider_net_refill_rx_chain(card);
1458
		spider_net_enable_rxdmac(card);
1459 1460 1461 1462 1463 1464 1465 1466 1467 1468
		show_error = 0;
		break;

	/* invalid descriptor */
	case SPIDER_NET_GDDINVDINT: /* fallthrough */
	case SPIDER_NET_GDCINVDINT: /* fallthrough */
	case SPIDER_NET_GDBINVDINT: /* fallthrough */
	case SPIDER_NET_GDAINVDINT:
		/* could happen when rx chain is full */
		spider_net_refill_rx_chain(card);
1469
		spider_net_enable_rxdmac(card);
1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523
		show_error = 0;
		break;

	/* case SPIDER_NET_GDTRSERINT: problem, print a message */
	/* case SPIDER_NET_GDDRSERINT: problem, print a message */
	/* case SPIDER_NET_GDCRSERINT: problem, print a message */
	/* case SPIDER_NET_GDBRSERINT: problem, print a message */
	/* case SPIDER_NET_GDARSERINT: problem, print a message */
	/* case SPIDER_NET_GDSERINT: problem, print a message */
	/* case SPIDER_NET_GDTPTERINT: problem, print a message */
	/* case SPIDER_NET_GDDPTERINT: problem, print a message */
	/* case SPIDER_NET_GDCPTERINT: problem, print a message */
	/* case SPIDER_NET_GDBPTERINT: problem, print a message */
	/* case SPIDER_NET_GDAPTERINT: problem, print a message */
	default:
		show_error = 1;
		break;
	}

	/* check GHIINT2STS ************************************/
	if (error_reg2)
		for (i = 0; i < 32; i++)
			if (error_reg2 & (1<<i))
				switch (i)
	{
	/* there is nothing we can (want  to) do at this time. Log a
	 * message, we can switch on and off the specific values later on
	case SPIDER_NET_GPROPERINT:
	case SPIDER_NET_GMCTCRSNGINT:
	case SPIDER_NET_GMCTLCOLINT:
	case SPIDER_NET_GMCTTMOTINT:
	case SPIDER_NET_GMCRCAERINT:
	case SPIDER_NET_GMCRCALERINT:
	case SPIDER_NET_GMCRALNERINT:
	case SPIDER_NET_GMCROVRINT:
	case SPIDER_NET_GMCRRNTINT:
	case SPIDER_NET_GMCRRXERINT:
	case SPIDER_NET_GTITCSERINT:
	case SPIDER_NET_GTIFMTERINT:
	case SPIDER_NET_GTIPKTRVKINT:
	case SPIDER_NET_GTISPINGINT:
	case SPIDER_NET_GTISADNGINT:
	case SPIDER_NET_GTISPDNGINT:
	case SPIDER_NET_GRIFMTERINT:
	case SPIDER_NET_GRIPKTRVKINT:
	case SPIDER_NET_GRISPINGINT:
	case SPIDER_NET_GRISADNGINT:
	case SPIDER_NET_GRISPDNGINT:
		break;
	*/
		default:
			break;
	}

1524
	if ((show_error) && (netif_msg_intr(card)) && net_ratelimit())
1525
		pr_err("Got error interrupt on %s, GHIINT0STS = 0x%08x, "
1526
		       "GHIINT1STS = 0x%08x, GHIINT2STS = 0x%08x\n",
1527
		       card->netdev->name,
1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547
		       status_reg, error_reg1, error_reg2);

	/* clear interrupt sources */
	spider_net_write_reg(card, SPIDER_NET_GHIINT1STS, error_reg1);
	spider_net_write_reg(card, SPIDER_NET_GHIINT2STS, error_reg2);
}

/**
 * spider_net_interrupt - interrupt handler for spider_net
 * @irq: interupt number
 * @ptr: pointer to net_device
 * @regs: PU registers
 *
 * returns IRQ_HANDLED, if interrupt was for driver, or IRQ_NONE, if no
 * interrupt found raised by card.
 *
 * This is the interrupt handler, that turns off
 * interrupts for this device and makes the stack poll the driver
 */
static irqreturn_t
1548
spider_net_interrupt(int irq, void *ptr)
1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562
{
	struct net_device *netdev = ptr;
	struct spider_net_card *card = netdev_priv(netdev);
	u32 status_reg;

	status_reg = spider_net_read_reg(card, SPIDER_NET_GHIINT0STS);

	if (!status_reg)
		return IRQ_NONE;

	if (status_reg & SPIDER_NET_RXINT ) {
		spider_net_rx_irq_off(card);
		netif_rx_schedule(netdev);
	}
1563 1564
	if (status_reg & SPIDER_NET_TXINT)
		netif_rx_schedule(netdev);
1565

1566 1567 1568
	if (status_reg & SPIDER_NET_LINKINT)
		spider_net_link_reset(netdev);

1569 1570
	if (status_reg & SPIDER_NET_ERRINT )
		spider_net_handle_error_irq(card, status_reg);
1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588

	/* clear interrupt sources */
	spider_net_write_reg(card, SPIDER_NET_GHIINT0STS, status_reg);

	return IRQ_HANDLED;
}

#ifdef CONFIG_NET_POLL_CONTROLLER
/**
 * spider_net_poll_controller - artificial interrupt for netconsole etc.
 * @netdev: interface device structure
 *
 * see Documentation/networking/netconsole.txt
 */
static void
spider_net_poll_controller(struct net_device *netdev)
{
	disable_irq(netdev->irq);
1589
	spider_net_interrupt(netdev->irq, netdev);
1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608
	enable_irq(netdev->irq);
}
#endif /* CONFIG_NET_POLL_CONTROLLER */

/**
 * spider_net_init_card - initializes the card
 * @card: card structure
 *
 * spider_net_init_card initializes the card so that other registers can
 * be used
 */
static void
spider_net_init_card(struct spider_net_card *card)
{
	spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
			     SPIDER_NET_CKRCTRL_STOP_VALUE);

	spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
			     SPIDER_NET_CKRCTRL_RUN_VALUE);
1609 1610 1611 1612 1613

	/* trigger ETOMOD signal */
	spider_net_write_reg(card, SPIDER_NET_GMACOPEMD,
		spider_net_read_reg(card, SPIDER_NET_GMACOPEMD) | 0x4);

1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655
}

/**
 * spider_net_enable_card - enables the card by setting all kinds of regs
 * @card: card structure
 *
 * spider_net_enable_card sets a lot of SMMIO registers to enable the device
 */
static void
spider_net_enable_card(struct spider_net_card *card)
{
	int i;
	/* the following array consists of (register),(value) pairs
	 * that are set in this function. A register of 0 ends the list */
	u32 regs[][2] = {
		{ SPIDER_NET_GRESUMINTNUM, 0 },
		{ SPIDER_NET_GREINTNUM, 0 },

		/* set interrupt frame number registers */
		/* clear the single DMA engine registers first */
		{ SPIDER_NET_GFAFRMNUM, SPIDER_NET_GFXFRAMES_VALUE },
		{ SPIDER_NET_GFBFRMNUM, SPIDER_NET_GFXFRAMES_VALUE },
		{ SPIDER_NET_GFCFRMNUM, SPIDER_NET_GFXFRAMES_VALUE },
		{ SPIDER_NET_GFDFRMNUM, SPIDER_NET_GFXFRAMES_VALUE },
		/* then set, what we really need */
		{ SPIDER_NET_GFFRMNUM, SPIDER_NET_FRAMENUM_VALUE },

		/* timer counter registers and stuff */
		{ SPIDER_NET_GFREECNNUM, 0 },
		{ SPIDER_NET_GONETIMENUM, 0 },
		{ SPIDER_NET_GTOUTFRMNUM, 0 },

		/* RX mode setting */
		{ SPIDER_NET_GRXMDSET, SPIDER_NET_RXMODE_VALUE },
		/* TX mode setting */
		{ SPIDER_NET_GTXMDSET, SPIDER_NET_TXMODE_VALUE },
		/* IPSEC mode setting */
		{ SPIDER_NET_GIPSECINIT, SPIDER_NET_IPSECINIT_VALUE },

		{ SPIDER_NET_GFTRESTRT, SPIDER_NET_RESTART_VALUE },

		{ SPIDER_NET_GMRWOLCTRL, 0 },
1656 1657
		{ SPIDER_NET_GTESTMD, 0x10000000 },
		{ SPIDER_NET_GTTQMSK, 0x00400040 },
1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707

		{ SPIDER_NET_GMACINTEN, 0 },

		/* flow control stuff */
		{ SPIDER_NET_GMACAPAUSE, SPIDER_NET_MACAPAUSE_VALUE },
		{ SPIDER_NET_GMACTXPAUSE, SPIDER_NET_TXPAUSE_VALUE },

		{ SPIDER_NET_GMACBSTLMT, SPIDER_NET_BURSTLMT_VALUE },
		{ 0, 0}
	};

	i = 0;
	while (regs[i][0]) {
		spider_net_write_reg(card, regs[i][0], regs[i][1]);
		i++;
	}

	/* clear unicast filter table entries 1 to 14 */
	for (i = 1; i <= 14; i++) {
		spider_net_write_reg(card,
				     SPIDER_NET_GMRUAFILnR + i * 8,
				     0x00080000);
		spider_net_write_reg(card,
				     SPIDER_NET_GMRUAFILnR + i * 8 + 4,
				     0x00000000);
	}

	spider_net_write_reg(card, SPIDER_NET_GMRUA0FIL15R, 0x08080000);

	spider_net_write_reg(card, SPIDER_NET_ECMODE, SPIDER_NET_ECMODE_VALUE);

	/* set chain tail adress for RX chains and
	 * enable DMA */
	spider_net_enable_rxchtails(card);
	spider_net_enable_rxdmac(card);

	spider_net_write_reg(card, SPIDER_NET_GRXDMAEN, SPIDER_NET_WOL_VALUE);

	spider_net_write_reg(card, SPIDER_NET_GMACLENLMT,
			     SPIDER_NET_LENLMT_VALUE);
	spider_net_write_reg(card, SPIDER_NET_GMACOPEMD,
			     SPIDER_NET_OPMODE_VALUE);

	/* set interrupt mask registers */
	spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK,
			     SPIDER_NET_INT0_MASK_VALUE);
	spider_net_write_reg(card, SPIDER_NET_GHIINT1MSK,
			     SPIDER_NET_INT1_MASK_VALUE);
	spider_net_write_reg(card, SPIDER_NET_GHIINT2MSK,
			     SPIDER_NET_INT2_MASK_VALUE);
1708 1709

	spider_net_write_reg(card, SPIDER_NET_GDTDMACCNTR,
1710
			     SPIDER_NET_GDTBSTA);
1711 1712
}

1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830
/**
 * spider_net_download_firmware - loads firmware into the adapter
 * @card: card structure
 * @firmware_ptr: pointer to firmware data
 *
 * spider_net_download_firmware loads the firmware data into the
 * adapter. It assumes the length etc. to be allright.
 */
static int
spider_net_download_firmware(struct spider_net_card *card,
			     const void *firmware_ptr)
{
	int sequencer, i;
	const u32 *fw_ptr = firmware_ptr;

	/* stop sequencers */
	spider_net_write_reg(card, SPIDER_NET_GSINIT,
			     SPIDER_NET_STOP_SEQ_VALUE);

	for (sequencer = 0; sequencer < SPIDER_NET_FIRMWARE_SEQS;
	     sequencer++) {
		spider_net_write_reg(card,
				     SPIDER_NET_GSnPRGADR + sequencer * 8, 0);
		for (i = 0; i < SPIDER_NET_FIRMWARE_SEQWORDS; i++) {
			spider_net_write_reg(card, SPIDER_NET_GSnPRGDAT +
					     sequencer * 8, *fw_ptr);
			fw_ptr++;
		}
	}

	if (spider_net_read_reg(card, SPIDER_NET_GSINIT))
		return -EIO;

	spider_net_write_reg(card, SPIDER_NET_GSINIT,
			     SPIDER_NET_RUN_SEQ_VALUE);

	return 0;
}

/**
 * spider_net_init_firmware - reads in firmware parts
 * @card: card structure
 *
 * Returns 0 on success, <0 on failure
 *
 * spider_net_init_firmware opens the sequencer firmware and does some basic
 * checks. This function opens and releases the firmware structure. A call
 * to download the firmware is performed before the release.
 *
 * Firmware format
 * ===============
 * spider_fw.bin is expected to be a file containing 6*1024*4 bytes, 4k being
 * the program for each sequencer. Use the command
 *    tail -q -n +2 Seq_code1_0x088.txt Seq_code2_0x090.txt              \
 *         Seq_code3_0x098.txt Seq_code4_0x0A0.txt Seq_code5_0x0A8.txt   \
 *         Seq_code6_0x0B0.txt | xxd -r -p -c4 > spider_fw.bin
 *
 * to generate spider_fw.bin, if you have sequencer programs with something
 * like the following contents for each sequencer:
 *    <ONE LINE COMMENT>
 *    <FIRST 4-BYTES-WORD FOR SEQUENCER>
 *    <SECOND 4-BYTES-WORD FOR SEQUENCER>
 *     ...
 *    <1024th 4-BYTES-WORD FOR SEQUENCER>
 */
static int
spider_net_init_firmware(struct spider_net_card *card)
{
	struct firmware *firmware = NULL;
	struct device_node *dn;
	const u8 *fw_prop = NULL;
	int err = -ENOENT;
	int fw_size;

	if (request_firmware((const struct firmware **)&firmware,
			     SPIDER_NET_FIRMWARE_NAME, &card->pdev->dev) == 0) {
		if ( (firmware->size != SPIDER_NET_FIRMWARE_LEN) &&
		     netif_msg_probe(card) ) {
			pr_err("Incorrect size of spidernet firmware in " \
			       "filesystem. Looking in host firmware...\n");
			goto try_host_fw;
		}
		err = spider_net_download_firmware(card, firmware->data);

		release_firmware(firmware);
		if (err)
			goto try_host_fw;

		goto done;
	}

try_host_fw:
	dn = pci_device_to_OF_node(card->pdev);
	if (!dn)
		goto out_err;

	fw_prop = get_property(dn, "firmware", &fw_size);
	if (!fw_prop)
		goto out_err;

	if ( (fw_size != SPIDER_NET_FIRMWARE_LEN) &&
	     netif_msg_probe(card) ) {
		pr_err("Incorrect size of spidernet firmware in " \
		       "host firmware\n");
		goto done;
	}

	err = spider_net_download_firmware(card, fw_prop);

done:
	return err;
out_err:
	if (netif_msg_probe(card))
		pr_err("Couldn't find spidernet firmware in filesystem " \
		       "or host firmware\n");
	return err;
}

1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843
/**
 * spider_net_open - called upon ifonfig up
 * @netdev: interface device structure
 *
 * returns 0 on success, <0 on failure
 *
 * spider_net_open allocates all the descriptors and memory needed for
 * operation, sets up multicast list and enables interrupts
 */
int
spider_net_open(struct net_device *netdev)
{
	struct spider_net_card *card = netdev_priv(netdev);
L
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1844
	int result;
1845

1846 1847 1848 1849
	result = spider_net_init_firmware(card);
	if (result)
		goto init_firmware_failed;

1850 1851 1852 1853 1854
	/* start probing with copper */
	spider_net_setup_aneg(card);
	if (card->phy.def->phy_id)
		mod_timer(&card->aneg_timer, jiffies + SPIDER_NET_ANEG_TIMER);

L
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1855 1856
	result = spider_net_init_chain(card, &card->tx_chain);
	if (result)
1857
		goto alloc_tx_failed;
1858 1859
	card->low_watermark = NULL;

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1860 1861
	result = spider_net_init_chain(card, &card->rx_chain);
	if (result)
1862 1863
		goto alloc_rx_failed;

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1864
	/* Allocate rx skbs */
1865 1866 1867 1868 1869 1870 1871 1872 1873
	if (spider_net_alloc_rx_skbs(card))
		goto alloc_skbs_failed;

	spider_net_set_multi(netdev);

	/* further enhancement: setup hw vlan, if needed */

	result = -EBUSY;
	if (request_irq(netdev->irq, spider_net_interrupt,
1874
			     IRQF_SHARED, netdev->name, netdev))
1875 1876 1877 1878
		goto register_int_failed;

	spider_net_enable_card(card);

1879 1880 1881 1882
	netif_start_queue(netdev);
	netif_carrier_on(netdev);
	netif_poll_enable(netdev);

1883 1884 1885 1886 1887 1888 1889 1890 1891
	return 0;

register_int_failed:
	spider_net_free_rx_chain_contents(card);
alloc_skbs_failed:
	spider_net_free_chain(card, &card->rx_chain);
alloc_rx_failed:
	spider_net_free_chain(card, &card->tx_chain);
alloc_tx_failed:
1892
	del_timer_sync(&card->aneg_timer);
1893
init_firmware_failed:
1894 1895 1896
	return result;
}

1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967
/**
 * spider_net_link_phy
 * @data: used for pointer to card structure
 *
 */
static void spider_net_link_phy(unsigned long data)
{
	struct spider_net_card *card = (struct spider_net_card *)data;
	struct mii_phy *phy = &card->phy;

	/* if link didn't come up after SPIDER_NET_ANEG_TIMEOUT tries, setup phy again */
	if (card->aneg_count > SPIDER_NET_ANEG_TIMEOUT) {

		pr_info("%s: link is down trying to bring it up\n", card->netdev->name);

		switch (phy->medium) {
		case GMII_COPPER:
			/* enable fiber with autonegotiation first */
			if (phy->def->ops->enable_fiber)
				phy->def->ops->enable_fiber(phy, 1);
			phy->medium = GMII_FIBER;
			break;

		case GMII_FIBER:
			/* fiber didn't come up, try to disable fiber autoneg */
			if (phy->def->ops->enable_fiber)
				phy->def->ops->enable_fiber(phy, 0);
			phy->medium = GMII_UNKNOWN;
			break;

		case GMII_UNKNOWN:
			/* copper, fiber with and without failed,
			 * retry from beginning */
			spider_net_setup_aneg(card);
			phy->medium = GMII_COPPER;
			break;
		}

		card->aneg_count = 0;
		mod_timer(&card->aneg_timer, jiffies + SPIDER_NET_ANEG_TIMER);
		return;
	}

	/* link still not up, try again later */
	if (!(phy->def->ops->poll_link(phy))) {
		card->aneg_count++;
		mod_timer(&card->aneg_timer, jiffies + SPIDER_NET_ANEG_TIMER);
		return;
	}

	/* link came up, get abilities */
	phy->def->ops->read_link(phy);

	spider_net_write_reg(card, SPIDER_NET_GMACST,
			     spider_net_read_reg(card, SPIDER_NET_GMACST));
	spider_net_write_reg(card, SPIDER_NET_GMACINTEN, 0x4);

	if (phy->speed == 1000)
		spider_net_write_reg(card, SPIDER_NET_GMACMODE, 0x00000001);
	else
		spider_net_write_reg(card, SPIDER_NET_GMACMODE, 0);

	card->aneg_count = 0;

	pr_debug("Found %s with %i Mbps, %s-duplex %sautoneg.\n",
		phy->def->name, phy->speed, phy->duplex==1 ? "Full" : "Half",
		phy->autoneg==1 ? "" : "no ");

	return;
}

1968 1969 1970 1971 1972 1973
/**
 * spider_net_setup_phy - setup PHY
 * @card: card structure
 *
 * returns 0 on success, <0 on failure
 *
1974
 * spider_net_setup_phy is used as part of spider_net_probe.
1975 1976 1977 1978 1979 1980 1981 1982 1983 1984
 **/
static int
spider_net_setup_phy(struct spider_net_card *card)
{
	struct mii_phy *phy = &card->phy;

	spider_net_write_reg(card, SPIDER_NET_GDTDMASEL,
			     SPIDER_NET_DMASEL_VALUE);
	spider_net_write_reg(card, SPIDER_NET_GPCCTRL,
			     SPIDER_NET_PHY_CTRL_VALUE);
1985

1986 1987 1988 1989
	phy->dev = card->netdev;
	phy->mdio_read = spider_net_read_phy;
	phy->mdio_write = spider_net_write_phy;

1990 1991 1992 1993 1994 1995 1996 1997 1998 1999
	for (phy->mii_id = 1; phy->mii_id <= 31; phy->mii_id++) {
		unsigned short id;
		id = spider_net_read_phy(card->netdev, phy->mii_id, MII_BMSR);
		if (id != 0x0000 && id != 0xffff) {
			if (!mii_phy_probe(phy, phy->mii_id)) {
				pr_info("Found %s.\n", phy->def->name);
				break;
			}
		}
	}
2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019

	return 0;
}

/**
 * spider_net_workaround_rxramfull - work around firmware bug
 * @card: card structure
 *
 * no return value
 **/
static void
spider_net_workaround_rxramfull(struct spider_net_card *card)
{
	int i, sequencer = 0;

	/* cancel reset */
	spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
			     SPIDER_NET_CKRCTRL_RUN_VALUE);

	/* empty sequencer data */
2020 2021
	for (sequencer = 0; sequencer < SPIDER_NET_FIRMWARE_SEQS;
	     sequencer++) {
2022
		spider_net_write_reg(card, SPIDER_NET_GSnPRGADR +
2023
				     sequencer * 8, 0x0);
2024
		for (i = 0; i < SPIDER_NET_FIRMWARE_SEQWORDS; i++) {
2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037
			spider_net_write_reg(card, SPIDER_NET_GSnPRGDAT +
					     sequencer * 8, 0x0);
		}
	}

	/* set sequencer operation */
	spider_net_write_reg(card, SPIDER_NET_GSINIT, 0x000000fe);

	/* reset */
	spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
			     SPIDER_NET_CKRCTRL_STOP_VALUE);
}

2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052
/**
 * spider_net_stop - called upon ifconfig down
 * @netdev: interface device structure
 *
 * always returns 0
 */
int
spider_net_stop(struct net_device *netdev)
{
	struct spider_net_card *card = netdev_priv(netdev);

	netif_poll_disable(netdev);
	netif_carrier_off(netdev);
	netif_stop_queue(netdev);
	del_timer_sync(&card->tx_timer);
2053
	del_timer_sync(&card->aneg_timer);
2054 2055 2056 2057 2058

	/* disable/mask all interrupts */
	spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK, 0);
	spider_net_write_reg(card, SPIDER_NET_GHIINT1MSK, 0);
	spider_net_write_reg(card, SPIDER_NET_GHIINT2MSK, 0);
2059
	spider_net_write_reg(card, SPIDER_NET_GMACINTEN, 0);
2060

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2061
	free_irq(netdev->irq, netdev);
2062 2063 2064 2065 2066 2067 2068 2069

	spider_net_write_reg(card, SPIDER_NET_GDTDMACCNTR,
			     SPIDER_NET_DMA_TX_FEND_VALUE);

	/* turn off DMA, force end */
	spider_net_disable_rxdmac(card);

	/* release chains */
2070
	spider_net_release_tx_chain(card, 1);
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2071
	spider_net_free_rx_chain_contents(card);
2072 2073 2074 2075 2076 2077 2078

	spider_net_free_chain(card, &card->tx_chain);
	spider_net_free_chain(card, &card->rx_chain);

	return 0;
}

2079 2080 2081 2082 2083 2084 2085 2086
/**
 * spider_net_tx_timeout_task - task scheduled by the watchdog timeout
 * function (to be called not under interrupt status)
 * @data: data, is interface device structure
 *
 * called as task when tx hangs, resets interface (if interface is up)
 */
static void
2087
spider_net_tx_timeout_task(struct work_struct *work)
2088
{
2089 2090 2091
	struct spider_net_card *card =
		container_of(work, struct spider_net_card, tx_timeout_task);
	struct net_device *netdev = card->netdev;
2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105

	if (!(netdev->flags & IFF_UP))
		goto out;

	netif_device_detach(netdev);
	spider_net_stop(netdev);

	spider_net_workaround_rxramfull(card);
	spider_net_init_card(card);

	if (spider_net_setup_phy(card))
		goto out;

	spider_net_open(netdev);
2106
	spider_net_kick_tx_dma(card);
2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129
	netif_device_attach(netdev);

out:
	atomic_dec(&card->tx_timeout_task_counter);
}

/**
 * spider_net_tx_timeout - called when the tx timeout watchdog kicks in.
 * @netdev: interface device structure
 *
 * called, if tx hangs. Schedules a task that resets the interface
 */
static void
spider_net_tx_timeout(struct net_device *netdev)
{
	struct spider_net_card *card;

	card = netdev_priv(netdev);
	atomic_inc(&card->tx_timeout_task_counter);
	if (netdev->flags & IFF_UP)
		schedule_work(&card->tx_timeout_task);
	else
		atomic_dec(&card->tx_timeout_task_counter);
2130
	card->spider_stats.tx_timeouts++;
2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182
}

/**
 * spider_net_setup_netdev_ops - initialization of net_device operations
 * @netdev: net_device structure
 *
 * fills out function pointers in the net_device structure
 */
static void
spider_net_setup_netdev_ops(struct net_device *netdev)
{
	netdev->open = &spider_net_open;
	netdev->stop = &spider_net_stop;
	netdev->hard_start_xmit = &spider_net_xmit;
	netdev->get_stats = &spider_net_get_stats;
	netdev->set_multicast_list = &spider_net_set_multi;
	netdev->set_mac_address = &spider_net_set_mac;
	netdev->change_mtu = &spider_net_change_mtu;
	netdev->do_ioctl = &spider_net_do_ioctl;
	/* tx watchdog */
	netdev->tx_timeout = &spider_net_tx_timeout;
	netdev->watchdog_timeo = SPIDER_NET_WATCHDOG_TIMEOUT;
	/* NAPI */
	netdev->poll = &spider_net_poll;
	netdev->weight = SPIDER_NET_NAPI_WEIGHT;
	/* HW VLAN */
	netdev->vlan_rx_register = &spider_net_vlan_rx_reg;
	netdev->vlan_rx_add_vid = &spider_net_vlan_rx_add;
	netdev->vlan_rx_kill_vid = &spider_net_vlan_rx_kill;
#ifdef CONFIG_NET_POLL_CONTROLLER
	/* poll controller */
	netdev->poll_controller = &spider_net_poll_controller;
#endif /* CONFIG_NET_POLL_CONTROLLER */
	/* ethtool ops */
	netdev->ethtool_ops = &spider_net_ethtool_ops;
}

/**
 * spider_net_setup_netdev - initialization of net_device
 * @card: card structure
 *
 * Returns 0 on success or <0 on failure
 *
 * spider_net_setup_netdev initializes the net_device structure
 **/
static int
spider_net_setup_netdev(struct spider_net_card *card)
{
	int result;
	struct net_device *netdev = card->netdev;
	struct device_node *dn;
	struct sockaddr addr;
2183
	const u8 *mac;
2184 2185 2186 2187 2188

	SET_MODULE_OWNER(netdev);
	SET_NETDEV_DEV(netdev, &card->pdev->dev);

	pci_set_drvdata(card->pdev, netdev);
2189 2190 2191 2192 2193

	init_timer(&card->tx_timer);
	card->tx_timer.function =
		(void (*)(unsigned long)) spider_net_cleanup_tx_ring;
	card->tx_timer.data = (unsigned long) card;
2194 2195
	netdev->irq = card->pdev->irq;

2196 2197 2198 2199 2200
	card->aneg_count = 0;
	init_timer(&card->aneg_timer);
	card->aneg_timer.function = spider_net_link_phy;
	card->aneg_timer.data = (unsigned long) card;

2201 2202
	card->options.rx_csum = SPIDER_NET_RX_CSUM_DEFAULT;

L
Linas Vepstas 已提交
2203 2204
	card->tx_chain.num_desc = tx_descriptors;
	card->rx_chain.num_desc = rx_descriptors;
2205

2206 2207
	spider_net_setup_netdev_ops(netdev);

2208
	netdev->features = NETIF_F_HW_CSUM | NETIF_F_LLTX;
2209 2210 2211 2212 2213 2214
	/* some time: NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_RX |
	 *		NETIF_F_HW_VLAN_FILTER */

	netdev->irq = card->pdev->irq;

	dn = pci_device_to_OF_node(card->pdev);
2215 2216 2217
	if (!dn)
		return -EIO;

2218
	mac = get_property(dn, "local-mac-address", NULL);
2219 2220
	if (!mac)
		return -EIO;
2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253
	memcpy(addr.sa_data, mac, ETH_ALEN);

	result = spider_net_set_mac(netdev, &addr);
	if ((result) && (netif_msg_probe(card)))
		pr_err("Failed to set MAC address: %i\n", result);

	result = register_netdev(netdev);
	if (result) {
		if (netif_msg_probe(card))
			pr_err("Couldn't register net_device: %i\n",
				  result);
		return result;
	}

	if (netif_msg_probe(card))
		pr_info("Initialized device %s.\n", netdev->name);

	return 0;
}

/**
 * spider_net_alloc_card - allocates net_device and card structure
 *
 * returns the card structure or NULL in case of errors
 *
 * the card and net_device structures are linked to each other
 */
static struct spider_net_card *
spider_net_alloc_card(void)
{
	struct net_device *netdev;
	struct spider_net_card *card;

L
Linas Vepstas 已提交
2254
	netdev = alloc_etherdev(sizeof(struct spider_net_card));
2255 2256 2257 2258 2259 2260
	if (!netdev)
		return NULL;

	card = netdev_priv(netdev);
	card->netdev = netdev;
	card->msg_enable = SPIDER_NET_DEFAULT_MSG;
2261
	INIT_WORK(&card->tx_timeout_task, spider_net_tx_timeout_task);
2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409
	init_waitqueue_head(&card->waitq);
	atomic_set(&card->tx_timeout_task_counter, 0);

	return card;
}

/**
 * spider_net_undo_pci_setup - releases PCI ressources
 * @card: card structure
 *
 * spider_net_undo_pci_setup releases the mapped regions
 */
static void
spider_net_undo_pci_setup(struct spider_net_card *card)
{
	iounmap(card->regs);
	pci_release_regions(card->pdev);
}

/**
 * spider_net_setup_pci_dev - sets up the device in terms of PCI operations
 * @card: card structure
 * @pdev: PCI device
 *
 * Returns the card structure or NULL if any errors occur
 *
 * spider_net_setup_pci_dev initializes pdev and together with the
 * functions called in spider_net_open configures the device so that
 * data can be transferred over it
 * The net_device structure is attached to the card structure, if the
 * function returns without error.
 **/
static struct spider_net_card *
spider_net_setup_pci_dev(struct pci_dev *pdev)
{
	struct spider_net_card *card;
	unsigned long mmio_start, mmio_len;

	if (pci_enable_device(pdev)) {
		pr_err("Couldn't enable PCI device\n");
		return NULL;
	}

	if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM)) {
		pr_err("Couldn't find proper PCI device base address.\n");
		goto out_disable_dev;
	}

	if (pci_request_regions(pdev, spider_net_driver_name)) {
		pr_err("Couldn't obtain PCI resources, aborting.\n");
		goto out_disable_dev;
	}

	pci_set_master(pdev);

	card = spider_net_alloc_card();
	if (!card) {
		pr_err("Couldn't allocate net_device structure, "
			  "aborting.\n");
		goto out_release_regions;
	}
	card->pdev = pdev;

	/* fetch base address and length of first resource */
	mmio_start = pci_resource_start(pdev, 0);
	mmio_len = pci_resource_len(pdev, 0);

	card->netdev->mem_start = mmio_start;
	card->netdev->mem_end = mmio_start + mmio_len;
	card->regs = ioremap(mmio_start, mmio_len);

	if (!card->regs) {
		pr_err("Couldn't obtain PCI resources, aborting.\n");
		goto out_release_regions;
	}

	return card;

out_release_regions:
	pci_release_regions(pdev);
out_disable_dev:
	pci_disable_device(pdev);
	pci_set_drvdata(pdev, NULL);
	return NULL;
}

/**
 * spider_net_probe - initialization of a device
 * @pdev: PCI device
 * @ent: entry in the device id list
 *
 * Returns 0 on success, <0 on failure
 *
 * spider_net_probe initializes pdev and registers a net_device
 * structure for it. After that, the device can be ifconfig'ed up
 **/
static int __devinit
spider_net_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
	int err = -EIO;
	struct spider_net_card *card;

	card = spider_net_setup_pci_dev(pdev);
	if (!card)
		goto out;

	spider_net_workaround_rxramfull(card);
	spider_net_init_card(card);

	err = spider_net_setup_phy(card);
	if (err)
		goto out_undo_pci;

	err = spider_net_setup_netdev(card);
	if (err)
		goto out_undo_pci;

	return 0;

out_undo_pci:
	spider_net_undo_pci_setup(card);
	free_netdev(card->netdev);
out:
	return err;
}

/**
 * spider_net_remove - removal of a device
 * @pdev: PCI device
 *
 * Returns 0 on success, <0 on failure
 *
 * spider_net_remove is called to remove the device and unregisters the
 * net_device
 **/
static void __devexit
spider_net_remove(struct pci_dev *pdev)
{
	struct net_device *netdev;
	struct spider_net_card *card;

	netdev = pci_get_drvdata(pdev);
	card = netdev_priv(netdev);

	wait_event(card->waitq,
		   atomic_read(&card->tx_timeout_task_counter) == 0);

	unregister_netdev(netdev);
2410 2411 2412 2413 2414 2415 2416

	/* switch off card */
	spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
			     SPIDER_NET_CKRCTRL_STOP_VALUE);
	spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
			     SPIDER_NET_CKRCTRL_RUN_VALUE);

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	spider_net_undo_pci_setup(card);
	free_netdev(netdev);
}

static struct pci_driver spider_net_driver = {
	.name		= spider_net_driver_name,
	.id_table	= spider_net_pci_tbl,
	.probe		= spider_net_probe,
	.remove		= __devexit_p(spider_net_remove)
};

/**
 * spider_net_init - init function when the driver is loaded
 *
 * spider_net_init registers the device driver
 */
static int __init spider_net_init(void)
{
2435 2436
	printk(KERN_INFO "Spidernet version %s.\n", VERSION);

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	if (rx_descriptors < SPIDER_NET_RX_DESCRIPTORS_MIN) {
		rx_descriptors = SPIDER_NET_RX_DESCRIPTORS_MIN;
		pr_info("adjusting rx descriptors to %i.\n", rx_descriptors);
	}
	if (rx_descriptors > SPIDER_NET_RX_DESCRIPTORS_MAX) {
		rx_descriptors = SPIDER_NET_RX_DESCRIPTORS_MAX;
		pr_info("adjusting rx descriptors to %i.\n", rx_descriptors);
	}
	if (tx_descriptors < SPIDER_NET_TX_DESCRIPTORS_MIN) {
		tx_descriptors = SPIDER_NET_TX_DESCRIPTORS_MIN;
		pr_info("adjusting tx descriptors to %i.\n", tx_descriptors);
	}
	if (tx_descriptors > SPIDER_NET_TX_DESCRIPTORS_MAX) {
		tx_descriptors = SPIDER_NET_TX_DESCRIPTORS_MAX;
		pr_info("adjusting tx descriptors to %i.\n", tx_descriptors);
	}

	return pci_register_driver(&spider_net_driver);
}

/**
 * spider_net_cleanup - exit function when driver is unloaded
 *
 * spider_net_cleanup unregisters the device driver
 */
static void __exit spider_net_cleanup(void)
{
	pci_unregister_driver(&spider_net_driver);
}

module_init(spider_net_init);
module_exit(spider_net_cleanup);
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