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Message-ID: <20220131100122.423164-4-horatiu.vultur@microchip.com>
Date: Mon, 31 Jan 2022 11:01:18 +0100
From: Horatiu Vultur <horatiu.vultur@...rochip.com>
To: <netdev@...r.kernel.org>, <devicetree@...r.kernel.org>,
<linux-kernel@...r.kernel.org>
CC: <davem@...emloft.net>, <kuba@...nel.org>, <robh+dt@...nel.org>,
<UNGLinuxDriver@...rochip.com>, <linux@...linux.org.uk>,
<richardcochran@...il.com>, <f.fainelli@...il.com>,
<vivien.didelot@...il.com>, <vladimir.oltean@....com>,
<andrew@...n.ch>, Horatiu Vultur <horatiu.vultur@...rochip.com>
Subject: [PATCH net-next v2 3/7] net: lan966x: Add support for ptp clocks
The lan966x has 3 PHC. Enable each of them, for now all the
timestamping is happening on the first PHC.
Acked-by: Richard Cochran <richardcochran@...il.com>
Signed-off-by: Horatiu Vultur <horatiu.vultur@...rochip.com>
---
.../net/ethernet/microchip/lan966x/Makefile | 3 +-
.../ethernet/microchip/lan966x/lan966x_main.c | 8 +
.../ethernet/microchip/lan966x/lan966x_main.h | 20 ++
.../ethernet/microchip/lan966x/lan966x_ptp.c | 287 ++++++++++++++++++
4 files changed, 317 insertions(+), 1 deletion(-)
create mode 100644 drivers/net/ethernet/microchip/lan966x/lan966x_ptp.c
diff --git a/drivers/net/ethernet/microchip/lan966x/Makefile b/drivers/net/ethernet/microchip/lan966x/Makefile
index 040cfff9f577..a9ffc719aa0e 100644
--- a/drivers/net/ethernet/microchip/lan966x/Makefile
+++ b/drivers/net/ethernet/microchip/lan966x/Makefile
@@ -7,4 +7,5 @@ obj-$(CONFIG_LAN966X_SWITCH) += lan966x-switch.o
lan966x-switch-objs := lan966x_main.o lan966x_phylink.o lan966x_port.o \
lan966x_mac.o lan966x_ethtool.o lan966x_switchdev.o \
- lan966x_vlan.o lan966x_fdb.o lan966x_mdb.o
+ lan966x_vlan.o lan966x_fdb.o lan966x_mdb.o \
+ lan966x_ptp.o
diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_main.c b/drivers/net/ethernet/microchip/lan966x/lan966x_main.c
index 2853e8f7fb39..ee3505318c5c 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_main.c
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_main.c
@@ -932,8 +932,15 @@ static int lan966x_probe(struct platform_device *pdev)
if (err)
goto cleanup_ports;
+ err = lan966x_ptp_init(lan966x);
+ if (err)
+ goto cleanup_fdb;
+
return 0;
+cleanup_fdb:
+ lan966x_fdb_deinit(lan966x);
+
cleanup_ports:
fwnode_handle_put(portnp);
@@ -959,6 +966,7 @@ static int lan966x_remove(struct platform_device *pdev)
lan966x_mac_purge_entries(lan966x);
lan966x_mdb_deinit(lan966x);
lan966x_fdb_deinit(lan966x);
+ lan966x_ptp_deinit(lan966x);
return 0;
}
diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_main.h b/drivers/net/ethernet/microchip/lan966x/lan966x_main.h
index 99c6d0a9f946..c77a91aa24e7 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_main.h
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_main.h
@@ -8,6 +8,7 @@
#include <linux/jiffies.h>
#include <linux/phy.h>
#include <linux/phylink.h>
+#include <linux/ptp_clock_kernel.h>
#include <net/switchdev.h>
#include "lan966x_regs.h"
@@ -50,6 +51,9 @@
#define LAN966X_SPEED_100 2
#define LAN966X_SPEED_10 3
+#define LAN966X_PHC_COUNT 3
+#define LAN966X_PHC_PORT 0
+
/* MAC table entry types.
* ENTRYTYPE_NORMAL is subject to aging.
* ENTRYTYPE_LOCKED is not subject to aging.
@@ -70,6 +74,14 @@ struct lan966x_stat_layout {
char name[ETH_GSTRING_LEN];
};
+struct lan966x_phc {
+ struct ptp_clock *clock;
+ struct ptp_clock_info info;
+ struct hwtstamp_config hwtstamp_config;
+ struct lan966x *lan966x;
+ u8 index;
+};
+
struct lan966x {
struct device *dev;
@@ -113,6 +125,11 @@ struct lan966x {
/* mdb */
struct list_head mdb_entries;
struct list_head pgid_entries;
+
+ /* ptp */
+ bool ptp;
+ struct lan966x_phc phc[LAN966X_PHC_COUNT];
+ spinlock_t ptp_clock_lock; /* lock for phc */
};
struct lan966x_port_config {
@@ -228,6 +245,9 @@ int lan966x_handle_port_mdb_del(struct lan966x_port *port,
void lan966x_mdb_erase_entries(struct lan966x *lan966x, u16 vid);
void lan966x_mdb_write_entries(struct lan966x *lan966x, u16 vid);
+int lan966x_ptp_init(struct lan966x *lan966x);
+void lan966x_ptp_deinit(struct lan966x *lan966x);
+
static inline void __iomem *lan_addr(void __iomem *base[],
int id, int tinst, int tcnt,
int gbase, int ginst,
diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_ptp.c b/drivers/net/ethernet/microchip/lan966x/lan966x_ptp.c
new file mode 100644
index 000000000000..69d8f43e2b1b
--- /dev/null
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_ptp.c
@@ -0,0 +1,287 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#include <linux/ptp_classify.h>
+
+#include "lan966x_main.h"
+
+#define LAN966X_MAX_PTP_ID 512
+
+/* Represents 1ppm adjustment in 2^59 format with 6.037735849ns as reference
+ * The value is calculated as following: (1/1000000)/((2^-59)/6.037735849)
+ */
+#define LAN966X_1PPM_FORMAT 3480517749723LL
+
+/* Represents 1ppb adjustment in 2^29 format with 6.037735849ns as reference
+ * The value is calculated as following: (1/1000000000)/((2^59)/6.037735849)
+ */
+#define LAN966X_1PPB_FORMAT 3480517749LL
+
+#define TOD_ACC_PIN 0x5
+
+enum {
+ PTP_PIN_ACTION_IDLE = 0,
+ PTP_PIN_ACTION_LOAD,
+ PTP_PIN_ACTION_SAVE,
+ PTP_PIN_ACTION_CLOCK,
+ PTP_PIN_ACTION_DELTA,
+ PTP_PIN_ACTION_TOD
+};
+
+static u64 lan966x_ptp_get_nominal_value(void)
+{
+ u64 res = 0x304d2df1;
+
+ res <<= 32;
+ return res;
+}
+
+static int lan966x_ptp_adjfine(struct ptp_clock_info *ptp, long scaled_ppm)
+{
+ struct lan966x_phc *phc = container_of(ptp, struct lan966x_phc, info);
+ struct lan966x *lan966x = phc->lan966x;
+ unsigned long flags;
+ bool neg_adj = 0;
+ u64 tod_inc;
+ u64 ref;
+
+ if (!scaled_ppm)
+ return 0;
+
+ if (scaled_ppm < 0) {
+ neg_adj = 1;
+ scaled_ppm = -scaled_ppm;
+ }
+
+ tod_inc = lan966x_ptp_get_nominal_value();
+
+ /* The multiplication is split in 2 separate additions because of
+ * overflow issues. If scaled_ppm with 16bit fractional part was bigger
+ * than 20ppm then we got overflow.
+ */
+ ref = LAN966X_1PPM_FORMAT * (scaled_ppm >> 16);
+ ref += (LAN966X_1PPM_FORMAT * (0xffff & scaled_ppm)) >> 16;
+ tod_inc = neg_adj ? tod_inc - ref : tod_inc + ref;
+
+ spin_lock_irqsave(&lan966x->ptp_clock_lock, flags);
+
+ lan_rmw(PTP_DOM_CFG_CLKCFG_DIS_SET(1 << BIT(phc->index)),
+ PTP_DOM_CFG_CLKCFG_DIS,
+ lan966x, PTP_DOM_CFG);
+
+ lan_wr((u32)tod_inc & 0xFFFFFFFF, lan966x,
+ PTP_CLK_PER_CFG(phc->index, 0));
+ lan_wr((u32)(tod_inc >> 32), lan966x,
+ PTP_CLK_PER_CFG(phc->index, 1));
+
+ lan_rmw(PTP_DOM_CFG_CLKCFG_DIS_SET(0),
+ PTP_DOM_CFG_CLKCFG_DIS,
+ lan966x, PTP_DOM_CFG);
+
+ spin_unlock_irqrestore(&lan966x->ptp_clock_lock, flags);
+
+ return 0;
+}
+
+static int lan966x_ptp_settime64(struct ptp_clock_info *ptp,
+ const struct timespec64 *ts)
+{
+ struct lan966x_phc *phc = container_of(ptp, struct lan966x_phc, info);
+ struct lan966x *lan966x = phc->lan966x;
+ unsigned long flags;
+
+ spin_lock_irqsave(&lan966x->ptp_clock_lock, flags);
+
+ /* Must be in IDLE mode before the time can be loaded */
+ lan_rmw(PTP_PIN_CFG_PIN_ACTION_SET(PTP_PIN_ACTION_IDLE) |
+ PTP_PIN_CFG_PIN_DOM_SET(phc->index) |
+ PTP_PIN_CFG_PIN_SYNC_SET(0),
+ PTP_PIN_CFG_PIN_ACTION |
+ PTP_PIN_CFG_PIN_DOM |
+ PTP_PIN_CFG_PIN_SYNC,
+ lan966x, PTP_PIN_CFG(TOD_ACC_PIN));
+
+ /* Set new value */
+ lan_wr(PTP_TOD_SEC_MSB_TOD_SEC_MSB_SET(upper_32_bits(ts->tv_sec)),
+ lan966x, PTP_TOD_SEC_MSB(TOD_ACC_PIN));
+ lan_wr(lower_32_bits(ts->tv_sec),
+ lan966x, PTP_TOD_SEC_LSB(TOD_ACC_PIN));
+ lan_wr(ts->tv_nsec, lan966x, PTP_TOD_NSEC(TOD_ACC_PIN));
+
+ /* Apply new values */
+ lan_rmw(PTP_PIN_CFG_PIN_ACTION_SET(PTP_PIN_ACTION_LOAD) |
+ PTP_PIN_CFG_PIN_DOM_SET(phc->index) |
+ PTP_PIN_CFG_PIN_SYNC_SET(0),
+ PTP_PIN_CFG_PIN_ACTION |
+ PTP_PIN_CFG_PIN_DOM |
+ PTP_PIN_CFG_PIN_SYNC,
+ lan966x, PTP_PIN_CFG(TOD_ACC_PIN));
+
+ spin_unlock_irqrestore(&lan966x->ptp_clock_lock, flags);
+
+ return 0;
+}
+
+static int lan966x_ptp_gettime64(struct ptp_clock_info *ptp,
+ struct timespec64 *ts)
+{
+ struct lan966x_phc *phc = container_of(ptp, struct lan966x_phc, info);
+ struct lan966x *lan966x = phc->lan966x;
+ unsigned long flags;
+ time64_t s;
+ s64 ns;
+
+ spin_lock_irqsave(&lan966x->ptp_clock_lock, flags);
+
+ lan_rmw(PTP_PIN_CFG_PIN_ACTION_SET(PTP_PIN_ACTION_SAVE) |
+ PTP_PIN_CFG_PIN_DOM_SET(phc->index) |
+ PTP_PIN_CFG_PIN_SYNC_SET(0),
+ PTP_PIN_CFG_PIN_ACTION |
+ PTP_PIN_CFG_PIN_DOM |
+ PTP_PIN_CFG_PIN_SYNC,
+ lan966x, PTP_PIN_CFG(TOD_ACC_PIN));
+
+ s = lan_rd(lan966x, PTP_TOD_SEC_MSB(TOD_ACC_PIN));
+ s <<= 32;
+ s |= lan_rd(lan966x, PTP_TOD_SEC_LSB(TOD_ACC_PIN));
+ ns = lan_rd(lan966x, PTP_TOD_NSEC(TOD_ACC_PIN));
+ ns &= PTP_TOD_NSEC_TOD_NSEC;
+
+ spin_unlock_irqrestore(&lan966x->ptp_clock_lock, flags);
+
+ /* Deal with negative values */
+ if ((ns & 0xFFFFFFF0) == 0x3FFFFFF0) {
+ s--;
+ ns &= 0xf;
+ ns += 999999984;
+ }
+
+ set_normalized_timespec64(ts, s, ns);
+ return 0;
+}
+
+static int lan966x_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
+{
+ struct lan966x_phc *phc = container_of(ptp, struct lan966x_phc, info);
+ struct lan966x *lan966x = phc->lan966x;
+
+ if (delta > -(NSEC_PER_SEC / 2) && delta < (NSEC_PER_SEC / 2)) {
+ unsigned long flags;
+
+ spin_lock_irqsave(&lan966x->ptp_clock_lock, flags);
+
+ /* Must be in IDLE mode before the time can be loaded */
+ lan_rmw(PTP_PIN_CFG_PIN_ACTION_SET(PTP_PIN_ACTION_IDLE) |
+ PTP_PIN_CFG_PIN_DOM_SET(phc->index) |
+ PTP_PIN_CFG_PIN_SYNC_SET(0),
+ PTP_PIN_CFG_PIN_ACTION |
+ PTP_PIN_CFG_PIN_DOM |
+ PTP_PIN_CFG_PIN_SYNC,
+ lan966x, PTP_PIN_CFG(TOD_ACC_PIN));
+
+ lan_wr(PTP_TOD_NSEC_TOD_NSEC_SET(delta),
+ lan966x, PTP_TOD_NSEC(TOD_ACC_PIN));
+
+ /* Adjust time with the value of PTP_TOD_NSEC */
+ lan_rmw(PTP_PIN_CFG_PIN_ACTION_SET(PTP_PIN_ACTION_DELTA) |
+ PTP_PIN_CFG_PIN_DOM_SET(phc->index) |
+ PTP_PIN_CFG_PIN_SYNC_SET(0),
+ PTP_PIN_CFG_PIN_ACTION |
+ PTP_PIN_CFG_PIN_DOM |
+ PTP_PIN_CFG_PIN_SYNC,
+ lan966x, PTP_PIN_CFG(TOD_ACC_PIN));
+
+ spin_unlock_irqrestore(&lan966x->ptp_clock_lock, flags);
+ } else {
+ /* Fall back using lan966x_ptp_settime64 which is not exact */
+ struct timespec64 ts;
+ u64 now;
+
+ lan966x_ptp_gettime64(ptp, &ts);
+
+ now = ktime_to_ns(timespec64_to_ktime(ts));
+ ts = ns_to_timespec64(now + delta);
+
+ lan966x_ptp_settime64(ptp, &ts);
+ }
+
+ return 0;
+}
+
+static struct ptp_clock_info lan966x_ptp_clock_info = {
+ .owner = THIS_MODULE,
+ .name = "lan966x ptp",
+ .max_adj = 200000,
+ .gettime64 = lan966x_ptp_gettime64,
+ .settime64 = lan966x_ptp_settime64,
+ .adjtime = lan966x_ptp_adjtime,
+ .adjfine = lan966x_ptp_adjfine,
+};
+
+static int lan966x_ptp_phc_init(struct lan966x *lan966x,
+ int index,
+ struct ptp_clock_info *clock_info)
+{
+ struct lan966x_phc *phc = &lan966x->phc[index];
+
+ phc->info = *clock_info;
+ phc->clock = ptp_clock_register(&phc->info, lan966x->dev);
+ if (IS_ERR(phc->clock))
+ return PTR_ERR(phc->clock);
+
+ phc->index = index;
+ phc->lan966x = lan966x;
+
+ /* PTP Rx stamping is always enabled. */
+ phc->hwtstamp_config.rx_filter = HWTSTAMP_FILTER_PTP_V2_EVENT;
+
+ return 0;
+}
+
+int lan966x_ptp_init(struct lan966x *lan966x)
+{
+ u64 tod_adj = lan966x_ptp_get_nominal_value();
+ int err, i;
+
+ if (!lan966x->ptp)
+ return 0;
+
+ for (i = 0; i < LAN966X_PHC_COUNT; ++i) {
+ err = lan966x_ptp_phc_init(lan966x, i, &lan966x_ptp_clock_info);
+ if (err)
+ return err;
+ }
+
+ spin_lock_init(&lan966x->ptp_clock_lock);
+
+ /* Disable master counters */
+ lan_wr(PTP_DOM_CFG_ENA_SET(0), lan966x, PTP_DOM_CFG);
+
+ /* Configure the nominal TOD increment per clock cycle */
+ lan_rmw(PTP_DOM_CFG_CLKCFG_DIS_SET(0x7),
+ PTP_DOM_CFG_CLKCFG_DIS,
+ lan966x, PTP_DOM_CFG);
+
+ for (i = 0; i < LAN966X_PHC_COUNT; ++i) {
+ lan_wr((u32)tod_adj & 0xFFFFFFFF, lan966x,
+ PTP_CLK_PER_CFG(i, 0));
+ lan_wr((u32)(tod_adj >> 32), lan966x,
+ PTP_CLK_PER_CFG(i, 1));
+ }
+
+ lan_rmw(PTP_DOM_CFG_CLKCFG_DIS_SET(0),
+ PTP_DOM_CFG_CLKCFG_DIS,
+ lan966x, PTP_DOM_CFG);
+
+ /* Enable master counters */
+ lan_wr(PTP_DOM_CFG_ENA_SET(0x7), lan966x, PTP_DOM_CFG);
+
+ return 0;
+}
+
+void lan966x_ptp_deinit(struct lan966x *lan966x)
+{
+ int i;
+
+ for (i = 0; i < LAN966X_PHC_COUNT; ++i)
+ ptp_clock_unregister(lan966x->phc[i].clock);
+}
--
2.33.0
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