===================================================================
@@ -3,4 +3,4 @@
#
obj-$(CONFIG_SH_ETH) += sh_eth.o
-obj-$(CONFIG_RAVB) += ravb.o
+obj-$(CONFIG_RAVB) += ravb.o ravb_ptp.o
===================================================================
@@ -28,7 +28,6 @@
#include <linux/of_irq.h>
#include <linux/of_mdio.h>
#include <linux/of_net.h>
-#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
@@ -41,8 +40,7 @@
NETIF_MSG_RX_ERR | \
NETIF_MSG_TX_ERR)
-static int ravb_wait(struct net_device *ndev, enum ravb_reg reg, u32 mask,
- u32 value)
+int ravb_wait(struct net_device *ndev, enum ravb_reg reg, u32 mask, u32 value)
{
int i;
@@ -763,6 +761,9 @@ static irqreturn_t ravb_interrupt(int ir
result = IRQ_HANDLED;
}
+ if (iss & ISS_CGIS)
+ result = ravb_ptp_interrupt(ndev);
+
mmiowb();
spin_unlock(&priv->lock);
return result;
@@ -1103,6 +1104,8 @@ static int ravb_set_ringparam(struct net
if (netif_running(ndev)) {
netif_device_detach(ndev);
+ /* Stop PTP Clock driver */
+ ravb_ptp_stop(ndev);
/* Wait for DMA stopping */
error = ravb_stop_dma(ndev);
if (error) {
@@ -1132,6 +1135,9 @@ static int ravb_set_ringparam(struct net
ravb_emac_init(ndev);
+ /* Initialise PTP Clock driver */
+ ravb_ptp_init(ndev, priv->pdev);
+
netif_device_attach(ndev);
}
@@ -1141,6 +1147,8 @@ static int ravb_set_ringparam(struct net
static int ravb_get_ts_info(struct net_device *ndev,
struct ethtool_ts_info *info)
{
+ struct ravb_private *priv = netdev_priv(ndev);
+
info->so_timestamping =
SOF_TIMESTAMPING_TX_SOFTWARE |
SOF_TIMESTAMPING_RX_SOFTWARE |
@@ -1153,7 +1161,7 @@ static int ravb_get_ts_info(struct net_d
(1 << HWTSTAMP_FILTER_NONE) |
(1 << HWTSTAMP_FILTER_PTP_V2_L2_EVENT) |
(1 << HWTSTAMP_FILTER_ALL);
- info->phc_index = -1;
+ info->phc_index = ptp_clock_index(priv->ptp.clock);
return 0;
}
@@ -1195,15 +1203,21 @@ static int ravb_open(struct net_device *
goto out_free_irq;
ravb_emac_init(ndev);
+ /* Initialise PTP Clock driver */
+ ravb_ptp_init(ndev, priv->pdev);
+
netif_tx_start_all_queues(ndev);
/* PHY control start */
error = ravb_phy_start(ndev);
if (error)
- goto out_free_irq;
+ goto out_ptp_stop;
return 0;
+out_ptp_stop:
+ /* Stop PTP Clock driver */
+ ravb_ptp_stop(ndev);
out_free_irq:
free_irq(ndev->irq, ndev);
out_napi_off:
@@ -1235,6 +1249,9 @@ static void ravb_tx_timeout_work(struct
netif_tx_stop_all_queues(ndev);
+ /* Stop PTP Clock driver */
+ ravb_ptp_stop(ndev);
+
/* Wait for DMA stopping */
ravb_stop_dma(ndev);
@@ -1245,6 +1262,9 @@ static void ravb_tx_timeout_work(struct
ravb_dmac_init(ndev);
ravb_emac_init(ndev);
+ /* Initialise PTP Clock driver */
+ ravb_ptp_init(ndev, priv->pdev);
+
netif_tx_start_all_queues(ndev);
}
@@ -1409,6 +1429,9 @@ static int ravb_close(struct net_device
ravb_write(ndev, 0, RIC2);
ravb_write(ndev, 0, TIC);
+ /* Stop PTP Clock driver */
+ ravb_ptp_stop(ndev);
+
/* Set the config mode to stop the AVB-DMAC's processes */
if (ravb_stop_dma(ndev) < 0)
netdev_err(ndev,
===================================================================
@@ -20,6 +20,8 @@
#include <linux/mdio-bitbang.h>
#include <linux/netdevice.h>
#include <linux/phy.h>
+#include <linux/platform_device.h>
+#include <linux/ptp_clock_kernel.h>
#define BE_TX_RING_SIZE 64 /* TX ring size for Best Effort */
#define BE_RX_RING_SIZE 1024 /* RX ring size for Best Effort */
@@ -744,6 +746,23 @@ struct ravb_tstamp_skb {
u16 tag;
};
+struct ravb_ptp_perout {
+ u32 target;
+ u32 period;
+};
+
+#define N_EXT_TS 1
+#define N_PER_OUT 1
+
+struct ravb_ptp {
+ struct ptp_clock *clock;
+ struct ptp_clock_info info;
+ u32 default_addend;
+ u32 current_addend;
+ int extts[N_EXT_TS];
+ struct ravb_ptp_perout perout[N_PER_OUT];
+};
+
struct ravb_private {
struct net_device *ndev;
struct platform_device *pdev;
@@ -768,6 +787,7 @@ struct ravb_private {
u32 tstamp_rx_ctrl;
struct list_head ts_skb_list;
u32 ts_skb_tag;
+ struct ravb_ptp ptp;
spinlock_t lock; /* Register access lock */
u32 cur_rx[NUM_RX_QUEUE]; /* Consumer ring indices */
u32 dirty_rx[NUM_RX_QUEUE]; /* Producer ring indices */
@@ -803,4 +823,10 @@ static inline void ravb_write(struct net
iowrite32(data, priv->addr + reg);
}
+int ravb_wait(struct net_device *ndev, enum ravb_reg reg, u32 mask, u32 value);
+
+irqreturn_t ravb_ptp_interrupt(struct net_device *ndev);
+void ravb_ptp_init(struct net_device *ndev, struct platform_device *pdev);
+void ravb_ptp_stop(struct net_device *ndev);
+
#endif /* #ifndef __RAVB_H__ */
===================================================================
@@ -0,0 +1,357 @@
+/* PTP 1588 clock using the Renesas Ethernet AVB
+ *
+ * Copyright (C) 2013-2015 Renesas Electronics Corporation
+ * Copyright (C) 2015 Renesas Solutions Corp.
+ * Copyright (C) 2015 Cogent Embedded, Inc. <source@cogentembedded.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 of the License, or
+ * (at your option) any later version.
+ */
+
+#include "ravb.h"
+
+static int ravb_ptp_tcr_request(struct ravb_private *priv, u32 request)
+{
+ struct net_device *ndev = priv->ndev;
+ int error;
+
+ error = ravb_wait(ndev, GCCR, GCCR_TCR, GCCR_TCR_NOREQ);
+ if (error)
+ return error;
+
+ ravb_write(ndev, ravb_read(ndev, GCCR) | request, GCCR);
+ return ravb_wait(ndev, GCCR, GCCR_TCR, GCCR_TCR_NOREQ);
+}
+
+/* Caller must hold the lock */
+static int ravb_ptp_time_read(struct ravb_private *priv, struct timespec64 *ts)
+{
+ struct net_device *ndev = priv->ndev;
+ int error;
+
+ error = ravb_ptp_tcr_request(priv, GCCR_TCR_CAPTURE);
+ if (error)
+ return error;
+
+ ts->tv_nsec = ravb_read(ndev, GCT0);
+ ts->tv_sec = ravb_read(ndev, GCT1) |
+ ((s64)ravb_read(ndev, GCT2) << 32);
+
+ return 0;
+}
+
+/* Caller must hold the lock */
+static int ravb_ptp_time_write(struct ravb_private *priv,
+ const struct timespec64 *ts)
+{
+ struct net_device *ndev = priv->ndev;
+ int error;
+ u32 gccr;
+
+ error = ravb_ptp_tcr_request(priv, GCCR_TCR_RESET);
+ if (error)
+ return error;
+
+ gccr = ravb_read(ndev, GCCR);
+ if (gccr & GCCR_LTO)
+ return -EBUSY;
+ ravb_write(ndev, ts->tv_nsec, GTO0);
+ ravb_write(ndev, ts->tv_sec, GTO1);
+ ravb_write(ndev, (ts->tv_sec >> 32) & 0xffff, GTO2);
+ ravb_write(ndev, gccr | GCCR_LTO, GCCR);
+
+ return 0;
+}
+
+/* Caller must hold the lock */
+static int ravb_ptp_update_compare(struct ravb_private *priv, u32 ns)
+{
+ struct net_device *ndev = priv->ndev;
+ /* When the comparison value (GPTC.PTCV) is in range of
+ * [x-1 to x+1] (x is the configured increment value in
+ * GTI.TIV), it may happen that a comparison match is
+ * not detected when the timer wraps around.
+ */
+ u32 gti_ns_plus_1 = (priv->ptp.current_addend >> 20) + 1;
+ u32 gccr;
+
+ if (ns < gti_ns_plus_1)
+ ns = gti_ns_plus_1;
+ else if (ns > 0 - gti_ns_plus_1)
+ ns = 0 - gti_ns_plus_1;
+
+ gccr = ravb_read(ndev, GCCR);
+ if (gccr & GCCR_LPTC)
+ return -EBUSY;
+ ravb_write(ndev, ns, GPTC);
+ ravb_write(ndev, gccr | GCCR_LPTC, GCCR);
+
+ return 0;
+}
+
+/* PTP clock operations */
+static int ravb_ptp_adjfreq(struct ptp_clock_info *ptp, s32 ppb)
+{
+ struct ravb_private *priv = container_of(ptp, struct ravb_private,
+ ptp.info);
+ struct net_device *ndev = priv->ndev;
+ unsigned long flags;
+ u32 diff, addend;
+ bool neg_adj = false;
+ u32 gccr;
+
+ if (ppb < 0) {
+ neg_adj = true;
+ ppb = -ppb;
+ }
+ addend = priv->ptp.default_addend;
+ diff = div_u64((u64)addend * ppb, NSEC_PER_SEC);
+
+ addend = neg_adj ? addend - diff : addend + diff;
+
+ spin_lock_irqsave(&priv->lock, flags);
+
+ priv->ptp.current_addend = addend;
+
+ gccr = ravb_read(ndev, GCCR);
+ if (gccr & GCCR_LTI)
+ return -EBUSY;
+ ravb_write(ndev, addend & GTI_TIV, GTI);
+ ravb_write(ndev, gccr | GCCR_LTI, GCCR);
+
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ return 0;
+}
+
+static int ravb_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
+{
+ struct ravb_private *priv = container_of(ptp, struct ravb_private,
+ ptp.info);
+ struct timespec64 ts;
+ unsigned long flags;
+ int error;
+
+ spin_lock_irqsave(&priv->lock, flags);
+ error = ravb_ptp_time_read(priv, &ts);
+ if (!error) {
+ u64 now = ktime_to_ns(timespec64_to_ktime(ts));
+
+ ts = ns_to_timespec64(now + delta);
+ error = ravb_ptp_time_write(priv, &ts);
+ }
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ return error;
+}
+
+static int ravb_ptp_gettime64(struct ptp_clock_info *ptp, struct timespec64 *ts)
+{
+ struct ravb_private *priv = container_of(ptp, struct ravb_private,
+ ptp.info);
+ unsigned long flags;
+ int error;
+
+ spin_lock_irqsave(&priv->lock, flags);
+ error = ravb_ptp_time_read(priv, ts);
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ return error;
+}
+
+static int ravb_ptp_settime64(struct ptp_clock_info *ptp,
+ const struct timespec64 *ts)
+{
+ struct ravb_private *priv = container_of(ptp, struct ravb_private,
+ ptp.info);
+ unsigned long flags;
+ int error;
+
+ spin_lock_irqsave(&priv->lock, flags);
+ error = ravb_ptp_time_write(priv, ts);
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ return error;
+}
+
+static int ravb_ptp_extts(struct ptp_clock_info *ptp,
+ struct ptp_extts_request *req, int on)
+{
+ struct ravb_private *priv = container_of(ptp, struct ravb_private,
+ ptp.info);
+ struct net_device *ndev = priv->ndev;
+ unsigned long flags;
+ u32 gic;
+
+ if (req->index)
+ return -EINVAL;
+
+ if (priv->ptp.extts[req->index] == on)
+ return 0;
+ priv->ptp.extts[req->index] = on;
+
+ spin_lock_irqsave(&priv->lock, flags);
+ gic = ravb_read(ndev, GIC);
+ if (on)
+ gic |= GIC_PTCE;
+ else
+ gic &= ~GIC_PTCE;
+ ravb_write(ndev, gic, GIC);
+ mmiowb();
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ return 0;
+}
+
+static int ravb_ptp_perout(struct ptp_clock_info *ptp,
+ struct ptp_perout_request *req, int on)
+{
+ struct ravb_private *priv = container_of(ptp, struct ravb_private,
+ ptp.info);
+ struct net_device *ndev = priv->ndev;
+ struct ravb_ptp_perout *perout;
+ unsigned long flags;
+ int error = 0;
+ u32 gic;
+
+ if (req->index)
+ return -EINVAL;
+
+ if (on) {
+ u64 start_ns;
+ u64 period_ns;
+
+ start_ns = req->start.sec * NSEC_PER_SEC + req->start.nsec;
+ period_ns = req->period.sec * NSEC_PER_SEC + req->period.nsec;
+
+ if (start_ns > U32_MAX) {
+ netdev_warn(ndev,
+ "ptp: start value (nsec) is over limit. Maximum size of start is only 32 bits\n");
+ return -ERANGE;
+ }
+
+ if (period_ns > U32_MAX) {
+ netdev_warn(ndev,
+ "ptp: period value (nsec) is over limit. Maximum size of period is only 32 bits\n");
+ return -ERANGE;
+ }
+
+ spin_lock_irqsave(&priv->lock, flags);
+
+ perout = &priv->ptp.perout[req->index];
+ perout->target = (u32)start_ns;
+ perout->period = (u32)period_ns;
+ error = ravb_ptp_update_compare(priv, (u32)start_ns);
+ if (!error) {
+ /* Unmask interrupt */
+ gic = ravb_read(ndev, GIC);
+ gic |= GIC_PTME;
+ ravb_write(ndev, gic, GIC);
+ }
+ } else {
+ spin_lock_irqsave(&priv->lock, flags);
+
+ perout = &priv->ptp.perout[req->index];
+ perout->period = 0;
+
+ /* Mask interrupt */
+ gic = ravb_read(ndev, GIC);
+ gic &= ~GIC_PTME;
+ ravb_write(ndev, gic, GIC);
+ }
+ mmiowb();
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ return error;
+}
+
+static int ravb_ptp_enable(struct ptp_clock_info *ptp,
+ struct ptp_clock_request *req, int on)
+{
+ switch (req->type) {
+ case PTP_CLK_REQ_EXTTS:
+ return ravb_ptp_extts(ptp, &req->extts, on);
+ case PTP_CLK_REQ_PEROUT:
+ return ravb_ptp_perout(ptp, &req->perout, on);
+ default:
+ return -EOPNOTSUPP;
+ }
+}
+
+static const struct ptp_clock_info ravb_ptp_info = {
+ .owner = THIS_MODULE,
+ .name = "ravb clock",
+ .max_adj = 50000000,
+ .n_ext_ts = N_EXT_TS,
+ .n_per_out = N_PER_OUT,
+ .adjfreq = ravb_ptp_adjfreq,
+ .adjtime = ravb_ptp_adjtime,
+ .gettime64 = ravb_ptp_gettime64,
+ .settime64 = ravb_ptp_settime64,
+ .enable = ravb_ptp_enable,
+};
+
+/* Caller must hold the lock */
+irqreturn_t ravb_ptp_interrupt(struct net_device *ndev)
+{
+ struct ravb_private *priv = netdev_priv(ndev);
+ u32 gis = ravb_read(ndev, GIS);
+
+ gis &= ravb_read(ndev, GIC);
+ if (gis & GIS_PTCF) {
+ struct ptp_clock_event event;
+
+ event.type = PTP_CLOCK_EXTTS;
+ event.index = 0;
+ event.timestamp = ravb_read(ndev, GCPT);
+ ptp_clock_event(priv->ptp.clock, &event);
+ }
+ if (gis & GIS_PTMF) {
+ struct ravb_ptp_perout *perout = priv->ptp.perout;
+
+ if (perout->period) {
+ perout->target += perout->period;
+ ravb_ptp_update_compare(priv, perout->target);
+ }
+ }
+
+ if (gis) {
+ ravb_write(ndev, ~gis, GIS);
+ return IRQ_HANDLED;
+ }
+
+ return IRQ_NONE;
+}
+
+void ravb_ptp_init(struct net_device *ndev, struct platform_device *pdev)
+{
+ struct ravb_private *priv = netdev_priv(ndev);
+ unsigned long flags;
+ u32 gccr;
+
+ priv->ptp.info = ravb_ptp_info;
+
+ priv->ptp.default_addend = ravb_read(ndev, GTI);
+ priv->ptp.current_addend = priv->ptp.default_addend;
+
+ spin_lock_irqsave(&priv->lock, flags);
+ ravb_wait(ndev, GCCR, GCCR_TCR, GCCR_TCR_NOREQ);
+ gccr = ravb_read(ndev, GCCR) & ~GCCR_TCSS;
+ ravb_write(ndev, gccr | GCCR_TCSS_ADJGPTP, GCCR);
+ mmiowb();
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ priv->ptp.clock = ptp_clock_register(&priv->ptp.info, &pdev->dev);
+}
+
+void ravb_ptp_stop(struct net_device *ndev)
+{
+ struct ravb_private *priv = netdev_priv(ndev);
+
+ ravb_write(ndev, 0, GIC);
+ ravb_write(ndev, 0, GIS);
+
+ ptp_clock_unregister(priv->ptp.clock);
+}