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SubjectRe: [patch 3/3] Add tsi108 On Chip Ethernet device driver support
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On Thu, 2006-09-21 at 12:46, Jeff Garzik wrote:
> Zang Roy-r61911 wrote:
> > +struct tsi108_prv_data {
> > + void __iomem *regs; /* Base of normal regs */
> > + void __iomem *phyregs; /* Base of register bank used for PHY
> access */
> > +
> > + int phy; /* Index of PHY for this interface */
> > + int irq_num;
> > + int id;
> > +
> > + struct timer_list timer;/* Timer that triggers the check phy
> function */
> > + int rxtail; /* Next entry in rxring to read */
> > + int rxhead; /* Next entry in rxring to give a new
> buffer */
> > + int rxfree; /* Number of free, allocated RX
> buffers */
> > +
> > + int rxpending; /* Non-zero if there are still
> descriptors
> > + * to be processed from a previous
> descriptor
> > + * interrupt condition that has been
> cleared */
> > +
> > + int txtail; /* Next TX descriptor to check status
> on */
> > + int txhead; /* Next TX descriptor to use */
>
> most of these should be unsigned, to prevent bugs.
>
>
> > + /* Number of free TX descriptors. This could be calculated
> from
> > + * rxhead and rxtail if one descriptor were left unused to
> disambiguate
> > + * full and empty conditions, but it's simpler to just keep
> track
> > + * explicitly. */
> > +
> > + int txfree;
> > +
> > + int phy_ok; /* The PHY is currently powered on. */
> > +
> > + /* PHY status (duplex is 1 for half, 2 for full,
> > + * so that the default 0 indicates that neither has
> > + * yet been configured). */
> > +
> > + int link_up;
> > + int speed;
> > + int duplex;
> > +
> > + tx_desc *txring;
> > + rx_desc *rxring;
> > + struct sk_buff *txskbs[TSI108_TXRING_LEN];
> > + struct sk_buff *rxskbs[TSI108_RXRING_LEN];
> > +
> > + dma_addr_t txdma, rxdma;
> > +
> > + /* txlock nests in misclock and phy_lock */
> > +
> > + spinlock_t txlock, misclock;
> > +
> > + /* stats is used to hold the upper bits of each hardware
> counter,
> > + * and tmpstats is used to hold the full values for returning
> > + * to the caller of get_stats(). They must be separate in
> case
> > + * an overflow interrupt occurs before the stats are consumed.
> > + */
> > +
> > + struct net_device_stats stats;
> > + struct net_device_stats tmpstats;
> > +
> > + /* These stats are kept separate in hardware, thus require
> individual
> > + * fields for handling carry. They are combined in get_stats.
> > + */
> > +
> > + unsigned long rx_fcs; /* Add to rx_frame_errors */
> > + unsigned long rx_short_fcs; /* Add to rx_frame_errors */
> > + unsigned long rx_long_fcs; /* Add to rx_frame_errors */
> > + unsigned long rx_underruns; /* Add to rx_length_errors */
> > + unsigned long rx_overruns; /* Add to rx_length_errors */
> > +
> > + unsigned long tx_coll_abort; /* Add to
> tx_aborted_errors/collisions */
> > + unsigned long tx_pause_drop; /* Add to tx_aborted_errors */
> > +
> > + unsigned long mc_hash[16];
> > +};
> > +
> > +/* Structure for a device driver */
> > +
> > +static struct platform_driver tsi_eth_driver = {
> > + .probe = tsi108_init_one,
> > + .remove = tsi108_ether_remove,
> > + .driver = {
> > + .name = "tsi-ethernet",
> > + },
> > +};
> > +
> > +static void tsi108_timed_checker(unsigned long dev_ptr);
> > +
> > +static void dump_eth_one(struct net_device *dev)
> > +{
> > + struct tsi108_prv_data *data = netdev_priv(dev);
> > +
> > + printk("Dumping %s...\n", dev->name);
> > + printk("intstat %x intmask %x phy_ok %d"
> > + " link %d speed %d duplex %d\n",
> > + TSI108_ETH_READ_REG(TSI108_EC_INTSTAT),
> > + TSI108_ETH_READ_REG(TSI108_EC_INTMASK), data->phy_ok,
> > + data->link_up, data->speed, data->duplex);
> > +
> > + printk("TX: head %d, tail %d, free %d, stat %x, estat %x, err
> %x\n",
> > + data->txhead, data->txtail, data->txfree,
> > + TSI108_ETH_READ_REG(TSI108_EC_TXSTAT),
> > + TSI108_ETH_READ_REG(TSI108_EC_TXESTAT),
> > + TSI108_ETH_READ_REG(TSI108_EC_TXERR));
> > +
> > + printk("RX: head %d, tail %d, free %d, stat %x,"
> > + " estat %x, err %x, pending %d\n\n",
> > + data->rxhead, data->rxtail, data->rxfree,
> > + TSI108_ETH_READ_REG(TSI108_EC_RXSTAT),
> > + TSI108_ETH_READ_REG(TSI108_EC_RXESTAT),
> > + TSI108_ETH_READ_REG(TSI108_EC_RXERR), data->rxpending);
> > +}
> > +
> > +/* Synchronization is needed between the thread and up/down events.
> > + * Note that the PHY is accessed through the same registers for
> both
> > + * interfaces, so this can't be made interface-specific.
> > + */
> > +
> > +static DEFINE_SPINLOCK(phy_lock);
>
> you should have a chip structure, that contains two structs (one for
> each interface/port)
>
>
Could you interpret the chip structure in more detail?
Need I create two net_device struct for each port?
Thanks.
Roy

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