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bfin_mac: offer a PTP Hardware Clock.
The BF518 has a PTP time unit that works in a similar way to other MAC based clocks, like gianfar, ixp46x, and igb. This patch adds support for using the blackfin as a PHC. Although the blackfin hardware does offer a few ancillary features, this patch implements only the basic operations. Compile tested only. Signed-off-by: Richard Cochran <richardcochran@gmail.com> Tested-by: Bob Liu <lliubbo@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Richard Cochran
David S. Miller
parent
bc3c5f634d
commit
dd87b22f90
@ -61,7 +61,7 @@ config BFIN_RX_DESC_NUM
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config BFIN_MAC_USE_HWSTAMP
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bool "Use IEEE 1588 hwstamp"
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depends on BFIN_MAC && BF518
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depends on BFIN_MAC && BF518 && PTP_1588_CLOCK && !(BFIN_MAC=y && PTP_1588_CLOCK=m)
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default y
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---help---
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To support the IEEE 1588 Precision Time Protocol (PTP), select y here
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@ -552,11 +552,13 @@ static int bfin_mac_ethtool_setwol(struct net_device *dev,
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static int bfin_mac_ethtool_get_ts_info(struct net_device *dev,
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struct ethtool_ts_info *info)
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{
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struct bfin_mac_local *lp = netdev_priv(dev);
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info->so_timestamping =
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SOF_TIMESTAMPING_TX_HARDWARE |
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SOF_TIMESTAMPING_RX_HARDWARE |
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SOF_TIMESTAMPING_RAW_HARDWARE;
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info->phc_index = -1;
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info->phc_index = lp->phc_index;
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info->tx_types =
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(1 << HWTSTAMP_TX_OFF) |
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(1 << HWTSTAMP_TX_ON);
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@ -887,7 +889,7 @@ static void bfin_rx_hwtstamp(struct net_device *netdev, struct sk_buff *skb)
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static void bfin_mac_hwtstamp_init(struct net_device *netdev)
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{
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struct bfin_mac_local *lp = netdev_priv(netdev);
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u64 addend;
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u64 addend, ppb;
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u32 input_clk, phc_clk;
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/* Initialize hardware timer */
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@ -898,18 +900,175 @@ static void bfin_mac_hwtstamp_init(struct net_device *netdev)
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bfin_write_EMAC_PTP_ADDEND((u32)addend);
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lp->addend = addend;
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ppb = 1000000000ULL * input_clk;
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do_div(ppb, phc_clk);
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lp->max_ppb = ppb - 1000000000ULL - 1ULL;
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/* Initialize hwstamp config */
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lp->stamp_cfg.rx_filter = HWTSTAMP_FILTER_NONE;
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lp->stamp_cfg.tx_type = HWTSTAMP_TX_OFF;
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}
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static u64 bfin_ptp_time_read(struct bfin_mac_local *lp)
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{
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u64 ns;
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u32 lo, hi;
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lo = bfin_read_EMAC_PTP_TIMELO();
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hi = bfin_read_EMAC_PTP_TIMEHI();
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ns = ((u64) hi) << 32;
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ns |= lo;
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ns <<= lp->shift;
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return ns;
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}
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static void bfin_ptp_time_write(struct bfin_mac_local *lp, u64 ns)
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{
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u32 hi, lo;
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ns >>= lp->shift;
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hi = ns >> 32;
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lo = ns & 0xffffffff;
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bfin_write_EMAC_PTP_TIMELO(lo);
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bfin_write_EMAC_PTP_TIMEHI(hi);
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}
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/* PTP Hardware Clock operations */
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static int bfin_ptp_adjfreq(struct ptp_clock_info *ptp, s32 ppb)
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{
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u64 adj;
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u32 diff, addend;
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int neg_adj = 0;
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struct bfin_mac_local *lp =
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container_of(ptp, struct bfin_mac_local, caps);
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if (ppb < 0) {
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neg_adj = 1;
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ppb = -ppb;
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}
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addend = lp->addend;
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adj = addend;
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adj *= ppb;
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diff = div_u64(adj, 1000000000ULL);
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addend = neg_adj ? addend - diff : addend + diff;
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bfin_write_EMAC_PTP_ADDEND(addend);
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return 0;
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}
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static int bfin_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
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{
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s64 now;
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unsigned long flags;
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struct bfin_mac_local *lp =
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container_of(ptp, struct bfin_mac_local, caps);
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spin_lock_irqsave(&lp->phc_lock, flags);
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now = bfin_ptp_time_read(lp);
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now += delta;
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bfin_ptp_time_write(lp, now);
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spin_unlock_irqrestore(&lp->phc_lock, flags);
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return 0;
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}
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static int bfin_ptp_gettime(struct ptp_clock_info *ptp, struct timespec *ts)
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{
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u64 ns;
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u32 remainder;
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unsigned long flags;
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struct bfin_mac_local *lp =
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container_of(ptp, struct bfin_mac_local, caps);
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spin_lock_irqsave(&lp->phc_lock, flags);
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ns = bfin_ptp_time_read(lp);
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spin_unlock_irqrestore(&lp->phc_lock, flags);
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ts->tv_sec = div_u64_rem(ns, 1000000000, &remainder);
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ts->tv_nsec = remainder;
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return 0;
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}
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static int bfin_ptp_settime(struct ptp_clock_info *ptp,
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const struct timespec *ts)
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{
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u64 ns;
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unsigned long flags;
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struct bfin_mac_local *lp =
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container_of(ptp, struct bfin_mac_local, caps);
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ns = ts->tv_sec * 1000000000ULL;
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ns += ts->tv_nsec;
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spin_lock_irqsave(&lp->phc_lock, flags);
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bfin_ptp_time_write(lp, ns);
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spin_unlock_irqrestore(&lp->phc_lock, flags);
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return 0;
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}
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static int bfin_ptp_enable(struct ptp_clock_info *ptp,
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struct ptp_clock_request *rq, int on)
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{
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return -EOPNOTSUPP;
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}
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static struct ptp_clock_info bfin_ptp_caps = {
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.owner = THIS_MODULE,
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.name = "BF518 clock",
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.max_adj = 0,
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.n_alarm = 0,
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.n_ext_ts = 0,
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.n_per_out = 0,
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.pps = 0,
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.adjfreq = bfin_ptp_adjfreq,
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.adjtime = bfin_ptp_adjtime,
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.gettime = bfin_ptp_gettime,
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.settime = bfin_ptp_settime,
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.enable = bfin_ptp_enable,
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};
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static int bfin_phc_init(struct net_device *netdev, struct device *dev)
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{
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struct bfin_mac_local *lp = netdev_priv(netdev);
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lp->caps = bfin_ptp_caps;
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lp->caps.max_adj = lp->max_ppb;
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lp->clock = ptp_clock_register(&lp->caps, dev);
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if (IS_ERR(lp->clock))
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return PTR_ERR(lp->clock);
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lp->phc_index = ptp_clock_index(lp->clock);
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spin_lock_init(&lp->phc_lock);
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return 0;
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}
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static void bfin_phc_release(struct bfin_mac_local *lp)
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{
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ptp_clock_unregister(lp->clock);
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}
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#else
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# define bfin_mac_hwtstamp_is_none(cfg) 0
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# define bfin_mac_hwtstamp_init(dev)
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# define bfin_mac_hwtstamp_ioctl(dev, ifr, cmd) (-EOPNOTSUPP)
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# define bfin_rx_hwtstamp(dev, skb)
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# define bfin_tx_hwtstamp(dev, skb)
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# define bfin_phc_init(netdev, dev) 0
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# define bfin_phc_release(lp)
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#endif
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static inline void _tx_reclaim_skb(void)
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@ -1544,12 +1703,17 @@ static int __devinit bfin_mac_probe(struct platform_device *pdev)
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}
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bfin_mac_hwtstamp_init(ndev);
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if (bfin_phc_init(ndev, &pdev->dev)) {
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dev_err(&pdev->dev, "Cannot register PHC device!\n");
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goto out_err_phc;
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}
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/* now, print out the card info, in a short format.. */
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netdev_info(ndev, "%s, Version %s\n", DRV_DESC, DRV_VERSION);
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return 0;
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out_err_phc:
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out_err_reg_ndev:
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free_irq(IRQ_MAC_RX, ndev);
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out_err_request_irq:
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@ -1568,6 +1732,8 @@ static int __devexit bfin_mac_remove(struct platform_device *pdev)
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struct net_device *ndev = platform_get_drvdata(pdev);
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struct bfin_mac_local *lp = netdev_priv(ndev);
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bfin_phc_release(lp);
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platform_set_drvdata(pdev, NULL);
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lp->mii_bus->priv = NULL;
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@ -11,6 +11,7 @@
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#define _BFIN_MAC_H_
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#include <linux/net_tstamp.h>
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#include <linux/ptp_clock_kernel.h>
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#include <linux/timer.h>
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#include <linux/etherdevice.h>
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#include <linux/bfin_mac.h>
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@ -94,7 +95,12 @@ struct bfin_mac_local {
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#if defined(CONFIG_BFIN_MAC_USE_HWSTAMP)
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u32 addend;
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unsigned int shift;
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s32 max_ppb;
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struct hwtstamp_config stamp_cfg;
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struct ptp_clock_info caps;
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struct ptp_clock *clock;
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int phc_index;
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spinlock_t phc_lock; /* protects time lo/hi registers */
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#endif
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};
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