5 files changed, 266 insertions, 4 deletions

diff --git a/arch/tile/gxio/iorpc_mpipe.c b/arch/tile/gxio/iorpc_mpipe.c
index c2fb15167aee..4f8f3d619c4a 100644
--- a/arch/tile/gxio/iorpc_mpipe.c
+++ b/arch/tile/gxio/iorpc_mpipe.c
@@ -475,6 +475,25 @@ int gxio_mpipe_adjust_timestamp_aux(gxio_mpipe_context_t * context,
 
 EXPORT_SYMBOL(gxio_mpipe_adjust_timestamp_aux);
 
+struct adjust_timestamp_freq_param {
+        int32_t ppb;
+};
+
+int gxio_mpipe_adjust_timestamp_freq(gxio_mpipe_context_t * context,
+                                     int32_t ppb)
+{
+        struct adjust_timestamp_freq_param temp;
+        struct adjust_timestamp_freq_param *params = &temp;
+
+        params->ppb = ppb;
+
+        return hv_dev_pwrite(context->fd, 0, (HV_VirtAddr) params,
+                             sizeof(*params),
+                             GXIO_MPIPE_OP_ADJUST_TIMESTAMP_FREQ);
+}
+
+EXPORT_SYMBOL(gxio_mpipe_adjust_timestamp_freq);
+
 struct config_edma_ring_blks_param {
         unsigned int ering;
         unsigned int max_blks;
diff --git a/arch/tile/include/gxio/iorpc_mpipe.h b/arch/tile/include/gxio/iorpc_mpipe.h
index eef60fdd8525..fdd07f88cfd7 100644
--- a/arch/tile/include/gxio/iorpc_mpipe.h
+++ b/arch/tile/include/gxio/iorpc_mpipe.h
@@ -46,10 +46,11 @@
 #define GXIO_MPIPE_OP_LINK_CLOSE_AUX   IORPC_OPCODE(IORPC_FORMAT_NONE, 0x1212)
 #define GXIO_MPIPE_OP_LINK_SET_ATTR_AUX IORPC_OPCODE(IORPC_FORMAT_NONE, 0x1213)
 
-#define GXIO_MPIPE_OP_GET_TIMESTAMP_AUX IORPC_OPCODE(IORPC_FORMAT_NONE_NOUSER, 0x121e)
-#define GXIO_MPIPE_OP_SET_TIMESTAMP_AUX IORPC_OPCODE(IORPC_FORMAT_NONE_NOUSER, 0x121f)
-#define GXIO_MPIPE_OP_ADJUST_TIMESTAMP_AUX IORPC_OPCODE(IORPC_FORMAT_NONE_NOUSER, 0x1220)
+#define GXIO_MPIPE_OP_GET_TIMESTAMP_AUX IORPC_OPCODE(IORPC_FORMAT_NONE, 0x121e)
+#define GXIO_MPIPE_OP_SET_TIMESTAMP_AUX IORPC_OPCODE(IORPC_FORMAT_NONE, 0x121f)
+#define GXIO_MPIPE_OP_ADJUST_TIMESTAMP_AUX IORPC_OPCODE(IORPC_FORMAT_NONE, 0x1220)
 #define GXIO_MPIPE_OP_CONFIG_EDMA_RING_BLKS IORPC_OPCODE(IORPC_FORMAT_NONE, 0x1221)
+#define GXIO_MPIPE_OP_ADJUST_TIMESTAMP_FREQ IORPC_OPCODE(IORPC_FORMAT_NONE, 0x1222)
 #define GXIO_MPIPE_OP_ARM_POLLFD       IORPC_OPCODE(IORPC_FORMAT_KERNEL_POLLFD, 0x9000)
 #define GXIO_MPIPE_OP_CLOSE_POLLFD     IORPC_OPCODE(IORPC_FORMAT_KERNEL_POLLFD, 0x9001)
 #define GXIO_MPIPE_OP_GET_MMIO_BASE    IORPC_OPCODE(IORPC_FORMAT_NONE_NOUSER, 0x8000)
@@ -128,6 +129,9 @@ int gxio_mpipe_set_timestamp_aux(gxio_mpipe_context_t * context, uint64_t sec,
 int gxio_mpipe_adjust_timestamp_aux(gxio_mpipe_context_t * context,
                                     int64_t nsec);
 
+int gxio_mpipe_adjust_timestamp_freq(gxio_mpipe_context_t * context,
+                                     int32_t ppb);
+
 int gxio_mpipe_arm_pollfd(gxio_mpipe_context_t * context, int pollfd_cookie);
 
 int gxio_mpipe_close_pollfd(gxio_mpipe_context_t * context, int pollfd_cookie);
diff --git a/arch/tile/include/gxio/mpipe.h b/arch/tile/include/gxio/mpipe.h
index eb7fee41c9b6..e37cf4f0cffd 100644
--- a/arch/tile/include/gxio/mpipe.h
+++ b/arch/tile/include/gxio/mpipe.h
@@ -1854,4 +1854,18 @@ extern int gxio_mpipe_set_timestamp(gxio_mpipe_context_t *context,
 extern int gxio_mpipe_adjust_timestamp(gxio_mpipe_context_t *context,
                                        int64_t delta);
 
+/** Adjust the mPIPE timestamp clock frequency.
+ *
+ * @param context An initialized mPIPE context.
+ * @param ppb A 32-bit signed PPB (Parts Per Billion) value to adjust.
+ * The absolute value of ppb must be less than or equal to 1000000000.
+ * Values less than about 30000 will generally cause a GXIO_ERR_INVAL
+ * return due to the granularity of the hardware that converts reference
+ * clock cycles into seconds and nanoseconds.
+ * @return If the call was successful, zero; otherwise, a negative error
+ *  code.
+ */
+extern int gxio_mpipe_adjust_timestamp_freq(gxio_mpipe_context_t* context,
+                                            int32_t ppb);
+
 #endif /* !_GXIO_MPIPE_H_ */
diff --git a/drivers/net/ethernet/tile/Kconfig b/drivers/net/ethernet/tile/Kconfig
index 098b1c42b393..4083ba8839e1 100644
--- a/drivers/net/ethernet/tile/Kconfig
+++ b/drivers/net/ethernet/tile/Kconfig
@@ -15,3 +15,14 @@ config TILE_NET
 
           To compile this driver as a module, choose M here: the module
           will be called tile_net.
+
+config PTP_1588_CLOCK_TILEGX
+        tristate "Tilera TILE-Gx mPIPE as PTP clock"
+        select PTP_1588_CLOCK
+        depends on TILE_NET
+        depends on TILEGX
+        ---help---
+          This driver adds support for using the mPIPE as a PTP
+          clock. This clock is only useful if your PTP programs are
+          getting hardware time stamps on the PTP Ethernet packets
+          using the SO_TIMESTAMPING API.
diff --git a/drivers/net/ethernet/tile/tilegx.c b/drivers/net/ethernet/tile/tilegx.c
index 0beed7e31f9e..907b5772fd55 100644
--- a/drivers/net/ethernet/tile/tilegx.c
+++ b/drivers/net/ethernet/tile/tilegx.c
@@ -38,6 +38,8 @@
 #include <linux/ip.h>
 #include <linux/ipv6.h>
 #include <linux/tcp.h>
+#include <linux/net_tstamp.h>
+#include <linux/ptp_clock_kernel.h>
 
 #include <asm/checksum.h>
 #include <asm/homecache.h>
@@ -185,6 +187,10 @@ struct tile_net_priv {
         int echannel;
         /* mPIPE instance, 0 or 1. */
         int instance;
+#ifdef CONFIG_PTP_1588_CLOCK_TILEGX
+        /* The timestamp config. */
+        struct hwtstamp_config stamp_cfg;
+#endif
 };
 
 static struct mpipe_data {
@@ -223,6 +229,15 @@ static struct mpipe_data {
         int first_bucket;
         int num_buckets;
 
+#ifdef CONFIG_PTP_1588_CLOCK_TILEGX
+        /* PTP-specific data. */
+        struct ptp_clock *ptp_clock;
+        struct ptp_clock_info caps;
+
+        /* Lock for ptp accessors. */
+        struct mutex ptp_lock;
+#endif
+
 } mpipe_data[NR_MPIPE_MAX] = {
         [0 ... (NR_MPIPE_MAX - 1)] {
                 .ingress_irq = -1,
@@ -432,6 +447,94 @@ static void tile_net_provide_needed_buffers(void)
         }
 }
 
+/* Get RX timestamp, and store it in the skb. */
+static void tile_rx_timestamp(struct tile_net_priv *priv, struct sk_buff *skb,
+                              gxio_mpipe_idesc_t *idesc)
+{
+#ifdef CONFIG_PTP_1588_CLOCK_TILEGX
+        if (unlikely(priv->stamp_cfg.rx_filter != HWTSTAMP_FILTER_NONE)) {
+                struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb);
+                memset(shhwtstamps, 0, sizeof(*shhwtstamps));
+                shhwtstamps->hwtstamp = ktime_set(idesc->time_stamp_sec,
+                                                  idesc->time_stamp_ns);
+        }
+#endif
+}
+
+/* Get TX timestamp, and store it in the skb. */
+static void tile_tx_timestamp(struct sk_buff *skb, int instance)
+{
+#ifdef CONFIG_PTP_1588_CLOCK_TILEGX
+        struct skb_shared_info *shtx = skb_shinfo(skb);
+        if (unlikely((shtx->tx_flags & SKBTX_HW_TSTAMP) != 0)) {
+                struct mpipe_data *md = &mpipe_data[instance];
+                struct skb_shared_hwtstamps shhwtstamps;
+                struct timespec ts;
+
+                shtx->tx_flags |= SKBTX_IN_PROGRESS;
+                gxio_mpipe_get_timestamp(&md->context, &ts);
+                memset(&shhwtstamps, 0, sizeof(shhwtstamps));
+                shhwtstamps.hwtstamp = ktime_set(ts.tv_sec, ts.tv_nsec);
+                skb_tstamp_tx(skb, &shhwtstamps);
+        }
+#endif
+}
+
+/* Use ioctl() to enable or disable TX or RX timestamping. */
+static int tile_hwtstamp_ioctl(struct net_device *dev, struct ifreq *rq,
+                               int cmd)
+{
+#ifdef CONFIG_PTP_1588_CLOCK_TILEGX
+        struct hwtstamp_config config;
+        struct tile_net_priv *priv = netdev_priv(dev);
+
+        if (copy_from_user(&config, rq->ifr_data, sizeof(config)))
+                return -EFAULT;
+
+        if (config.flags)  /* reserved for future extensions */
+                return -EINVAL;
+
+        switch (config.tx_type) {
+        case HWTSTAMP_TX_OFF:
+        case HWTSTAMP_TX_ON:
+                break;
+        default:
+                return -ERANGE;
+        }
+
+        switch (config.rx_filter) {
+        case HWTSTAMP_FILTER_NONE:
+                break;
+        case HWTSTAMP_FILTER_ALL:
+        case HWTSTAMP_FILTER_SOME:
+        case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
+        case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
+        case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
+        case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
+        case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
+        case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
+        case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
+        case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
+        case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
+        case HWTSTAMP_FILTER_PTP_V2_EVENT:
+        case HWTSTAMP_FILTER_PTP_V2_SYNC:
+        case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
+                config.rx_filter = HWTSTAMP_FILTER_ALL;
+                break;
+        default:
+                return -ERANGE;
+        }
+
+        if (copy_to_user(rq->ifr_data, &config, sizeof(config)))
+                return -EFAULT;
+
+        priv->stamp_cfg = config;
+        return 0;
+#else
+        return -EOPNOTSUPP;
+#endif
+}
+
 static inline bool filter_packet(struct net_device *dev, void *buf)
 {
         /* Filter packets received before we're up. */
@@ -451,7 +554,8 @@ static void tile_net_receive_skb(struct net_device *dev, struct sk_buff *skb,
                                  gxio_mpipe_idesc_t *idesc, unsigned long len)
 {
         struct tile_net_info *info = &__get_cpu_var(per_cpu_info);
-        int instance = mpipe_instance(dev);
+        struct tile_net_priv *priv = netdev_priv(dev);
+        int instance = priv->instance;
 
         /* Encode the actual packet length. */
         skb_put(skb, len);
@@ -462,6 +566,9 @@ static void tile_net_receive_skb(struct net_device *dev, struct sk_buff *skb,
         if (idesc->cs && idesc->csum_seed_val == 0xFFFF)
                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 
+        /* Get RX timestamp from idesc. */
+        tile_rx_timestamp(priv, skb, idesc);
+
         napi_gro_receive(&info->mpipe[instance].napi, skb);
 
         /* Update stats. */
@@ -707,6 +814,103 @@ static enum hrtimer_restart tile_net_handle_egress_timer(struct hrtimer *t)
         return HRTIMER_NORESTART;
 }
 
+#ifdef CONFIG_PTP_1588_CLOCK_TILEGX
+
+/* PTP clock operations. */
+
+static int ptp_mpipe_adjfreq(struct ptp_clock_info *ptp, s32 ppb)
+{
+        int ret = 0;
+        struct mpipe_data *md = container_of(ptp, struct mpipe_data, caps);
+        mutex_lock(&md->ptp_lock);
+        if (gxio_mpipe_adjust_timestamp_freq(&md->context, ppb))
+                ret = -EINVAL;
+        mutex_unlock(&md->ptp_lock);
+        return ret;
+}
+
+static int ptp_mpipe_adjtime(struct ptp_clock_info *ptp, s64 delta)
+{
+        int ret = 0;
+        struct mpipe_data *md = container_of(ptp, struct mpipe_data, caps);
+        mutex_lock(&md->ptp_lock);
+        if (gxio_mpipe_adjust_timestamp(&md->context, delta))
+                ret = -EBUSY;
+        mutex_unlock(&md->ptp_lock);
+        return ret;
+}
+
+static int ptp_mpipe_gettime(struct ptp_clock_info *ptp, struct timespec *ts)
+{
+        int ret = 0;
+        struct mpipe_data *md = container_of(ptp, struct mpipe_data, caps);
+        mutex_lock(&md->ptp_lock);
+        if (gxio_mpipe_get_timestamp(&md->context, ts))
+                ret = -EBUSY;
+        mutex_unlock(&md->ptp_lock);
+        return ret;
+}
+
+static int ptp_mpipe_settime(struct ptp_clock_info *ptp,
+                             const struct timespec *ts)
+{
+        int ret = 0;
+        struct mpipe_data *md = container_of(ptp, struct mpipe_data, caps);
+        mutex_lock(&md->ptp_lock);
+        if (gxio_mpipe_set_timestamp(&md->context, ts))
+                ret = -EBUSY;
+        mutex_unlock(&md->ptp_lock);
+        return ret;
+}
+
+static int ptp_mpipe_enable(struct ptp_clock_info *ptp,
+                            struct ptp_clock_request *request, int on)
+{
+        return -EOPNOTSUPP;
+}
+
+static struct ptp_clock_info ptp_mpipe_caps = {
+        .owner          = THIS_MODULE,
+        .name           = "mPIPE clock",
+        .max_adj        = 999999999,
+        .n_ext_ts       = 0,
+        .pps            = 0,
+        .adjfreq        = ptp_mpipe_adjfreq,
+        .adjtime        = ptp_mpipe_adjtime,
+        .gettime        = ptp_mpipe_gettime,
+        .settime        = ptp_mpipe_settime,
+        .enable         = ptp_mpipe_enable,
+};
+
+#endif /* CONFIG_PTP_1588_CLOCK_TILEGX */
+
+/* Sync mPIPE's timestamp up with Linux system time and register PTP clock. */
+static void register_ptp_clock(struct net_device *dev, struct mpipe_data *md)
+{
+#ifdef CONFIG_PTP_1588_CLOCK_TILEGX
+        struct timespec ts;
+
+        getnstimeofday(&ts);
+        gxio_mpipe_set_timestamp(&md->context, &ts);
+
+        mutex_init(&md->ptp_lock);
+        md->caps = ptp_mpipe_caps;
+        md->ptp_clock = ptp_clock_register(&md->caps, NULL);
+        if (IS_ERR(md->ptp_clock))
+                netdev_err(dev, "ptp_clock_register failed %ld\n",
+                           PTR_ERR(md->ptp_clock));
+#endif
+}
+
+/* Initialize PTP fields in a new device. */
+static void init_ptp_dev(struct tile_net_priv *priv)
+{
+#ifdef CONFIG_PTP_1588_CLOCK_TILEGX
+        priv->stamp_cfg.rx_filter = HWTSTAMP_FILTER_NONE;
+        priv->stamp_cfg.tx_type = HWTSTAMP_TX_OFF;
+#endif
+}
+
 /* Helper functions for "tile_net_update()". */
 static void enable_ingress_irq(void *irq)
 {
@@ -1149,6 +1353,9 @@ static int tile_net_init_mpipe(struct net_device *dev)
         if (rc != 0)
                 goto fail;
 
+        /* Register PTP clock and set mPIPE timestamp, if configured. */
+        register_ptp_clock(dev, md);
+
         return 0;
 
 fail:
@@ -1851,6 +2058,9 @@ static int tile_net_tx(struct sk_buff *skb, struct net_device *dev)
         for (i = 0; i < num_edescs; i++)
                 gxio_mpipe_equeue_put_at(equeue, edescs[i], slot++);
 
+        /* Store TX timestamp if needed. */
+        tile_tx_timestamp(skb, instance);
+
         /* Add a completion record. */
         add_comp(equeue, comps, slot - 1, skb);
 
@@ -1885,6 +2095,9 @@ static void tile_net_tx_timeout(struct net_device *dev)
 /* Ioctl commands. */
 static int tile_net_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
 {
+        if (cmd == SIOCSHWTSTAMP)
+                return tile_hwtstamp_ioctl(dev, rq, cmd);
+
         return -EOPNOTSUPP;
 }
 
@@ -2005,6 +2218,7 @@ static void tile_net_dev_init(const char *name, const uint8_t *mac)
         priv->channel = -1;
         priv->loopify_channel = -1;
         priv->echannel = -1;
+        init_ptp_dev(priv);
 
         /* Get the MAC address and set it in the device struct; this must
          * be done before the device is opened.  If the MAC is all zeroes,