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Date: Fri, 28 Sep 2012 19:20:27 +0200
From: Richard Cochran <richardcochran@...il.com>
To: <netdev@...r.kernel.org>
Cc: <device-drivers-devel@...ckfin.uclinux.org>,
<uclinux-dist-devel@...ckfin.uclinux.org>,
David Miller <davem@...emloft.net>,
Jacob Keller <jacob.e.keller@...el.com>,
Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
John Ronciak <john.ronciak@...el.com>,
John Stultz <john.stultz@...aro.org>,
Mike Frysinger <vapier@...too.org>,
Miroslav Lichvar <mlichvar@...hat.com>,
Patrick Ohly <patrick.ohly@...el.com>,
Sonic Zhang <sonic.zhang@...log.com>
Subject: [PATCH RFC net-next 3/4] 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@...il.com>
---
drivers/net/ethernet/adi/Kconfig | 2 +-
drivers/net/ethernet/adi/bfin_mac.c | 170 ++++++++++++++++++++++++++++++++++-
drivers/net/ethernet/adi/bfin_mac.h | 6 ++
3 files changed, 175 insertions(+), 3 deletions(-)
diff --git a/drivers/net/ethernet/adi/Kconfig b/drivers/net/ethernet/adi/Kconfig
index 49a30d3..175c38c 100644
--- a/drivers/net/ethernet/adi/Kconfig
+++ b/drivers/net/ethernet/adi/Kconfig
@@ -61,7 +61,7 @@ config BFIN_RX_DESC_NUM
config BFIN_MAC_USE_HWSTAMP
bool "Use IEEE 1588 hwstamp"
- depends on BFIN_MAC && BF518
+ depends on BFIN_MAC && BF518 && PTP_1588_CLOCK && !(BFIN_MAC=y && PTP_1588_CLOCK=m)
default y
---help---
To support the IEEE 1588 Precision Time Protocol (PTP), select y here
diff --git a/drivers/net/ethernet/adi/bfin_mac.c b/drivers/net/ethernet/adi/bfin_mac.c
index 393d1b5..88053a4 100644
--- a/drivers/net/ethernet/adi/bfin_mac.c
+++ b/drivers/net/ethernet/adi/bfin_mac.c
@@ -552,11 +552,13 @@ static int bfin_mac_ethtool_setwol(struct net_device *dev,
static int bfin_mac_ethtool_get_ts_info(struct net_device *dev,
struct ethtool_ts_info *info)
{
+ struct bfin_mac_local *lp = netdev_priv(dev);
+
info->so_timestamping =
SOF_TIMESTAMPING_TX_HARDWARE |
SOF_TIMESTAMPING_RX_HARDWARE |
SOF_TIMESTAMPING_RAW_HARDWARE;
- info->phc_index = -1;
+ info->phc_index = lp->phc_index;
info->tx_types =
(1 << HWTSTAMP_TX_OFF) |
(1 << HWTSTAMP_TX_ON);
@@ -887,7 +889,7 @@ static void bfin_rx_hwtstamp(struct net_device *netdev, struct sk_buff *skb)
static void bfin_mac_hwtstamp_init(struct net_device *netdev)
{
struct bfin_mac_local *lp = netdev_priv(netdev);
- u64 addend;
+ u64 addend, ppb;
u32 input_clk, phc_clk;
/* Initialize hardware timer */
@@ -898,18 +900,175 @@ static void bfin_mac_hwtstamp_init(struct net_device *netdev)
bfin_write_EMAC_PTP_ADDEND((u32)addend);
lp->addend = addend;
+ ppb = 1000000000ULL * input_clk;
+ do_div(ppb, phc_clk);
+ lp->max_ppb = ppb - 1000000000ULL - 1ULL;
/* Initialize hwstamp config */
lp->stamp_cfg.rx_filter = HWTSTAMP_FILTER_NONE;
lp->stamp_cfg.tx_type = HWTSTAMP_TX_OFF;
}
+static u64 bfin_ptp_time_read(struct bfin_mac_local *lp)
+{
+ u64 ns;
+ u32 lo, hi;
+
+ lo = bfin_read_EMAC_PTP_TIMELO();
+ hi = bfin_read_EMAC_PTP_TIMEHI();
+
+ ns = ((u64) hi) << 32;
+ ns |= lo;
+ ns <<= lp->shift;
+
+ return ns;
+}
+
+static void bfin_ptp_time_write(struct bfin_mac_local *lp, u64 ns)
+{
+ u32 hi, lo;
+
+ ns >>= lp->shift;
+ hi = ns >> 32;
+ lo = ns & 0xffffffff;
+
+ bfin_write_EMAC_PTP_TIMELO(lo);
+ bfin_write_EMAC_PTP_TIMEHI(hi);
+}
+
+/* PTP Hardware Clock operations */
+
+static int bfin_ptp_adjfreq(struct ptp_clock_info *ptp, s32 ppb)
+{
+ u64 adj;
+ u32 diff, addend;
+ int neg_adj = 0;
+ struct bfin_mac_local *lp =
+ container_of(ptp, struct bfin_mac_local, caps);
+
+ if (ppb < 0) {
+ neg_adj = 1;
+ ppb = -ppb;
+ }
+ addend = lp->addend;
+ adj = addend;
+ adj *= ppb;
+ diff = div_u64(adj, 1000000000ULL);
+
+ addend = neg_adj ? addend - diff : addend + diff;
+
+ bfin_write_EMAC_PTP_ADDEND(addend);
+
+ return 0;
+}
+
+static int bfin_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
+{
+ s64 now;
+ unsigned long flags;
+ struct bfin_mac_local *lp =
+ container_of(ptp, struct bfin_mac_local, caps);
+
+ spin_lock_irqsave(&lp->phc_lock, flags);
+
+ now = bfin_ptp_time_read(lp);
+ now += delta;
+ bfin_ptp_time_write(lp, now);
+
+ spin_unlock_irqrestore(&lp->phc_lock, flags);
+
+ return 0;
+}
+
+static int bfin_ptp_gettime(struct ptp_clock_info *ptp, struct timespec *ts)
+{
+ u64 ns;
+ u32 remainder;
+ unsigned long flags;
+ struct bfin_mac_local *lp =
+ container_of(ptp, struct bfin_mac_local, caps);
+
+ spin_lock_irqsave(&lp->phc_lock, flags);
+
+ ns = bfin_ptp_time_read(lp);
+
+ spin_unlock_irqrestore(&lp->phc_lock, flags);
+
+ ts->tv_sec = div_u64_rem(ns, 1000000000, &remainder);
+ ts->tv_nsec = remainder;
+ return 0;
+}
+
+static int bfin_ptp_settime(struct ptp_clock_info *ptp,
+ const struct timespec *ts)
+{
+ u64 ns;
+ unsigned long flags;
+ struct bfin_mac_local *lp =
+ container_of(ptp, struct bfin_mac_local, caps);
+
+ ns = ts->tv_sec * 1000000000ULL;
+ ns += ts->tv_nsec;
+
+ spin_lock_irqsave(&lp->phc_lock, flags);
+
+ bfin_ptp_time_write(lp, ns);
+
+ spin_unlock_irqrestore(&lp->phc_lock, flags);
+
+ return 0;
+}
+
+static int bfin_ptp_enable(struct ptp_clock_info *ptp,
+ struct ptp_clock_request *rq, int on)
+{
+ return -EOPNOTSUPP;
+}
+
+static struct ptp_clock_info bfin_ptp_caps = {
+ .owner = THIS_MODULE,
+ .name = "BF518 clock",
+ .max_adj = 0,
+ .n_alarm = 0,
+ .n_ext_ts = 0,
+ .n_per_out = 0,
+ .pps = 0,
+ .adjfreq = bfin_ptp_adjfreq,
+ .adjtime = bfin_ptp_adjtime,
+ .gettime = bfin_ptp_gettime,
+ .settime = bfin_ptp_settime,
+ .enable = bfin_ptp_enable,
+};
+
+static int bfin_phc_init(struct net_device *netdev, struct device *dev)
+{
+ struct bfin_mac_local *lp = netdev_priv(netdev);
+
+ lp->caps = bfin_ptp_caps;
+ lp->caps.max_adj = lp->max_ppb;
+ lp->clock = ptp_clock_register(&lp->caps, dev);
+ if (IS_ERR(lp->clock))
+ return PTR_ERR(lp->clock);
+
+ lp->phc_index = ptp_clock_index(lp->clock);
+ spin_lock_init(&lp->phc_lock);
+
+ return 0;
+}
+
+static void bfin_phc_release(struct bfin_mac_local *lp)
+{
+ ptp_clock_unregister(lp->clock);
+}
+
#else
# define bfin_mac_hwtstamp_is_none(cfg) 0
# define bfin_mac_hwtstamp_init(dev)
# define bfin_mac_hwtstamp_ioctl(dev, ifr, cmd) (-EOPNOTSUPP)
# define bfin_rx_hwtstamp(dev, skb)
# define bfin_tx_hwtstamp(dev, skb)
+# define bfin_phc_init(netdev, dev) 0
+# define bfin_phc_release(lp)
#endif
static inline void _tx_reclaim_skb(void)
@@ -1544,12 +1703,17 @@ static int __devinit bfin_mac_probe(struct platform_device *pdev)
}
bfin_mac_hwtstamp_init(ndev);
+ if (bfin_phc_init(ndev, &pdev->dev)) {
+ dev_err(&pdev->dev, "Cannot register PHC device!\n");
+ goto out_err_phc;
+ }
/* now, print out the card info, in a short format.. */
netdev_info(ndev, "%s, Version %s\n", DRV_DESC, DRV_VERSION);
return 0;
+out_err_phc:
out_err_reg_ndev:
free_irq(IRQ_MAC_RX, ndev);
out_err_request_irq:
@@ -1568,6 +1732,8 @@ static int __devexit bfin_mac_remove(struct platform_device *pdev)
struct net_device *ndev = platform_get_drvdata(pdev);
struct bfin_mac_local *lp = netdev_priv(ndev);
+ bfin_phc_release(lp);
+
platform_set_drvdata(pdev, NULL);
lp->mii_bus->priv = NULL;
diff --git a/drivers/net/ethernet/adi/bfin_mac.h b/drivers/net/ethernet/adi/bfin_mac.h
index 57f042c..7a07ee0 100644
--- a/drivers/net/ethernet/adi/bfin_mac.h
+++ b/drivers/net/ethernet/adi/bfin_mac.h
@@ -11,6 +11,7 @@
#define _BFIN_MAC_H_
#include <linux/net_tstamp.h>
+#include <linux/ptp_clock_kernel.h>
#include <linux/timer.h>
#include <linux/etherdevice.h>
#include <linux/bfin_mac.h>
@@ -94,7 +95,12 @@ struct bfin_mac_local {
#if defined(CONFIG_BFIN_MAC_USE_HWSTAMP)
u32 addend;
unsigned int shift;
+ s32 max_ppb;
struct hwtstamp_config stamp_cfg;
+ struct ptp_clock_info caps;
+ struct ptp_clock *clock;
+ int phc_index;
+ spinlock_t phc_lock; /* protects time lo/hi registers */
#endif
};
--
1.7.2.5
--
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