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dp83640.c
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/*
* Driver for the National Semiconductor DP83640 PHYTER
*
* Copyright (C) 2010 OMICRON electronics GmbH
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/ethtool.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/mii.h>
#include <linux/module.h>
#include <linux/net_tstamp.h>
#include <linux/netdevice.h>
#include <linux/phy.h>
#include <linux/ptp_classify.h>
#include <linux/ptp_clock_kernel.h>
#include "dp83640_reg.h"
#define DP83640_PHY_ID 0x20005ce1
#define PAGESEL 0x13
#define LAYER4 0x02
#define LAYER2 0x01
#define MAX_RXTS 64
#define N_EXT_TS 6
#define PSF_PTPVER 2
#define PSF_EVNT 0x4000
#define PSF_RX 0x2000
#define PSF_TX 0x1000
#define EXT_EVENT 1
#define CAL_EVENT 7
#define CAL_TRIGGER 7
#define PER_TRIGGER 6
/* phyter seems to miss the mark by 16 ns */
#define ADJTIME_FIX 16
#if defined(__BIG_ENDIAN)
#define ENDIAN_FLAG 0
#elif defined(__LITTLE_ENDIAN)
#define ENDIAN_FLAG PSF_ENDIAN
#endif
#define SKB_PTP_TYPE(__skb) (*(unsigned int *)((__skb)->cb))
struct phy_rxts {
u16 ns_lo; /* ns[15:0] */
u16 ns_hi; /* overflow[1:0], ns[29:16] */
u16 sec_lo; /* sec[15:0] */
u16 sec_hi; /* sec[31:16] */
u16 seqid; /* sequenceId[15:0] */
u16 msgtype; /* messageType[3:0], hash[11:0] */
};
struct phy_txts {
u16 ns_lo; /* ns[15:0] */
u16 ns_hi; /* overflow[1:0], ns[29:16] */
u16 sec_lo; /* sec[15:0] */
u16 sec_hi; /* sec[31:16] */
};
struct rxts {
struct list_head list;
unsigned long tmo;
u64 ns;
u16 seqid;
u8 msgtype;
u16 hash;
};
struct dp83640_clock;
struct dp83640_private {
struct list_head list;
struct dp83640_clock *clock;
struct phy_device *phydev;
struct work_struct ts_work;
int hwts_tx_en;
int hwts_rx_en;
int layer;
int version;
/* remember state of cfg0 during calibration */
int cfg0;
/* remember the last event time stamp */
struct phy_txts edata;
/* list of rx timestamps */
struct list_head rxts;
struct list_head rxpool;
struct rxts rx_pool_data[MAX_RXTS];
/* protects above three fields from concurrent access */
spinlock_t rx_lock;
/* queues of incoming and outgoing packets */
struct sk_buff_head rx_queue;
struct sk_buff_head tx_queue;
};
struct dp83640_clock {
/* keeps the instance in the 'phyter_clocks' list */
struct list_head list;
/* we create one clock instance per MII bus */
struct mii_bus *bus;
/* protects extended registers from concurrent access */
struct mutex extreg_lock;
/* remembers which page was last selected */
int page;
/* our advertised capabilities */
struct ptp_clock_info caps;
/* protects the three fields below from concurrent access */
struct mutex clock_lock;
/* the one phyter from which we shall read */
struct dp83640_private *chosen;
/* list of the other attached phyters, not chosen */
struct list_head phylist;
/* reference to our PTP hardware clock */
struct ptp_clock *ptp_clock;
};
/* globals */
enum {
CALIBRATE_GPIO,
PEROUT_GPIO,
EXTTS0_GPIO,
EXTTS1_GPIO,
EXTTS2_GPIO,
EXTTS3_GPIO,
EXTTS4_GPIO,
EXTTS5_GPIO,
GPIO_TABLE_SIZE
};
static int chosen_phy = -1;
static ushort gpio_tab[GPIO_TABLE_SIZE] = {
1, 2, 3, 4, 8, 9, 10, 11
};
module_param(chosen_phy, int, 0444);
module_param_array(gpio_tab, ushort, NULL, 0444);
MODULE_PARM_DESC(chosen_phy, \
"The address of the PHY to use for the ancillary clock features");
MODULE_PARM_DESC(gpio_tab, \
"Which GPIO line to use for which purpose: cal,perout,extts1,...,extts6");
/* a list of clocks and a mutex to protect it */
static LIST_HEAD(phyter_clocks);
static DEFINE_MUTEX(phyter_clocks_lock);
static void rx_timestamp_work(struct work_struct *work);
/* extended register access functions */
#define BROADCAST_ADDR 31
static inline int broadcast_write(struct mii_bus *bus, u32 regnum, u16 val)
{
return mdiobus_write(bus, BROADCAST_ADDR, regnum, val);
}
/* Caller must hold extreg_lock. */
static int ext_read(struct phy_device *phydev, int page, u32 regnum)
{
struct dp83640_private *dp83640 = phydev->priv;
int val;
if (dp83640->clock->page != page) {
broadcast_write(phydev->bus, PAGESEL, page);
dp83640->clock->page = page;
}
val = phy_read(phydev, regnum);
return val;
}
/* Caller must hold extreg_lock. */
static void ext_write(int broadcast, struct phy_device *phydev,
int page, u32 regnum, u16 val)
{
struct dp83640_private *dp83640 = phydev->priv;
if (dp83640->clock->page != page) {
broadcast_write(phydev->bus, PAGESEL, page);
dp83640->clock->page = page;
}
if (broadcast)
broadcast_write(phydev->bus, regnum, val);
else
phy_write(phydev, regnum, val);
}
/* Caller must hold extreg_lock. */
static int tdr_write(int bc, struct phy_device *dev,
const struct timespec *ts, u16 cmd)
{
ext_write(bc, dev, PAGE4, PTP_TDR, ts->tv_nsec & 0xffff);/* ns[15:0] */
ext_write(bc, dev, PAGE4, PTP_TDR, ts->tv_nsec >> 16); /* ns[31:16] */
ext_write(bc, dev, PAGE4, PTP_TDR, ts->tv_sec & 0xffff); /* sec[15:0] */
ext_write(bc, dev, PAGE4, PTP_TDR, ts->tv_sec >> 16); /* sec[31:16]*/
ext_write(bc, dev, PAGE4, PTP_CTL, cmd);
return 0;
}
/* convert phy timestamps into driver timestamps */
static void phy2rxts(struct phy_rxts *p, struct rxts *rxts)
{
u32 sec;
sec = p->sec_lo;
sec |= p->sec_hi << 16;
rxts->ns = p->ns_lo;
rxts->ns |= (p->ns_hi & 0x3fff) << 16;
rxts->ns += ((u64)sec) * 1000000000ULL;
rxts->seqid = p->seqid;
rxts->msgtype = (p->msgtype >> 12) & 0xf;
rxts->hash = p->msgtype & 0x0fff;
rxts->tmo = jiffies + 2;
}
static u64 phy2txts(struct phy_txts *p)
{
u64 ns;
u32 sec;
sec = p->sec_lo;
sec |= p->sec_hi << 16;
ns = p->ns_lo;
ns |= (p->ns_hi & 0x3fff) << 16;
ns += ((u64)sec) * 1000000000ULL;
return ns;
}
static void periodic_output(struct dp83640_clock *clock,
struct ptp_clock_request *clkreq, bool on)
{
struct dp83640_private *dp83640 = clock->chosen;
struct phy_device *phydev = dp83640->phydev;
u32 sec, nsec, period;
u16 gpio, ptp_trig, trigger, val;
gpio = on ? gpio_tab[PEROUT_GPIO] : 0;
trigger = PER_TRIGGER;
ptp_trig = TRIG_WR |
(trigger & TRIG_CSEL_MASK) << TRIG_CSEL_SHIFT |
(gpio & TRIG_GPIO_MASK) << TRIG_GPIO_SHIFT |
TRIG_PER |
TRIG_PULSE;
val = (trigger & TRIG_SEL_MASK) << TRIG_SEL_SHIFT;
if (!on) {
val |= TRIG_DIS;
mutex_lock(&clock->extreg_lock);
ext_write(0, phydev, PAGE5, PTP_TRIG, ptp_trig);
ext_write(0, phydev, PAGE4, PTP_CTL, val);
mutex_unlock(&clock->extreg_lock);
return;
}
sec = clkreq->perout.start.sec;
nsec = clkreq->perout.start.nsec;
period = clkreq->perout.period.sec * 1000000000UL;
period += clkreq->perout.period.nsec;
mutex_lock(&clock->extreg_lock);
ext_write(0, phydev, PAGE5, PTP_TRIG, ptp_trig);
/*load trigger*/
val |= TRIG_LOAD;
ext_write(0, phydev, PAGE4, PTP_CTL, val);
ext_write(0, phydev, PAGE4, PTP_TDR, nsec & 0xffff); /* ns[15:0] */
ext_write(0, phydev, PAGE4, PTP_TDR, nsec >> 16); /* ns[31:16] */
ext_write(0, phydev, PAGE4, PTP_TDR, sec & 0xffff); /* sec[15:0] */
ext_write(0, phydev, PAGE4, PTP_TDR, sec >> 16); /* sec[31:16] */
ext_write(0, phydev, PAGE4, PTP_TDR, period & 0xffff); /* ns[15:0] */
ext_write(0, phydev, PAGE4, PTP_TDR, period >> 16); /* ns[31:16] */
/*enable trigger*/
val &= ~TRIG_LOAD;
val |= TRIG_EN;
ext_write(0, phydev, PAGE4, PTP_CTL, val);
mutex_unlock(&clock->extreg_lock);
}
/* ptp clock methods */
static int ptp_dp83640_adjfreq(struct ptp_clock_info *ptp, s32 ppb)
{
struct dp83640_clock *clock =
container_of(ptp, struct dp83640_clock, caps);
struct phy_device *phydev = clock->chosen->phydev;
u64 rate;
int neg_adj = 0;
u16 hi, lo;
if (ppb < 0) {
neg_adj = 1;
ppb = -ppb;
}
rate = ppb;
rate <<= 26;
rate = div_u64(rate, 1953125);
hi = (rate >> 16) & PTP_RATE_HI_MASK;
if (neg_adj)
hi |= PTP_RATE_DIR;
lo = rate & 0xffff;
mutex_lock(&clock->extreg_lock);
ext_write(1, phydev, PAGE4, PTP_RATEH, hi);
ext_write(1, phydev, PAGE4, PTP_RATEL, lo);
mutex_unlock(&clock->extreg_lock);
return 0;
}
static int ptp_dp83640_adjtime(struct ptp_clock_info *ptp, s64 delta)
{
struct dp83640_clock *clock =
container_of(ptp, struct dp83640_clock, caps);
struct phy_device *phydev = clock->chosen->phydev;
struct timespec ts;
int err;
delta += ADJTIME_FIX;
ts = ns_to_timespec(delta);
mutex_lock(&clock->extreg_lock);
err = tdr_write(1, phydev, &ts, PTP_STEP_CLK);
mutex_unlock(&clock->extreg_lock);
return err;
}
static int ptp_dp83640_gettime(struct ptp_clock_info *ptp, struct timespec *ts)
{
struct dp83640_clock *clock =
container_of(ptp, struct dp83640_clock, caps);
struct phy_device *phydev = clock->chosen->phydev;
unsigned int val[4];
mutex_lock(&clock->extreg_lock);
ext_write(0, phydev, PAGE4, PTP_CTL, PTP_RD_CLK);
val[0] = ext_read(phydev, PAGE4, PTP_TDR); /* ns[15:0] */
val[1] = ext_read(phydev, PAGE4, PTP_TDR); /* ns[31:16] */
val[2] = ext_read(phydev, PAGE4, PTP_TDR); /* sec[15:0] */
val[3] = ext_read(phydev, PAGE4, PTP_TDR); /* sec[31:16] */
mutex_unlock(&clock->extreg_lock);
ts->tv_nsec = val[0] | (val[1] << 16);
ts->tv_sec = val[2] | (val[3] << 16);
return 0;
}
static int ptp_dp83640_settime(struct ptp_clock_info *ptp,
const struct timespec *ts)
{
struct dp83640_clock *clock =
container_of(ptp, struct dp83640_clock, caps);
struct phy_device *phydev = clock->chosen->phydev;
int err;
mutex_lock(&clock->extreg_lock);
err = tdr_write(1, phydev, ts, PTP_LOAD_CLK);
mutex_unlock(&clock->extreg_lock);
return err;
}
static int ptp_dp83640_enable(struct ptp_clock_info *ptp,
struct ptp_clock_request *rq, int on)
{
struct dp83640_clock *clock =
container_of(ptp, struct dp83640_clock, caps);
struct phy_device *phydev = clock->chosen->phydev;
int index;
u16 evnt, event_num, gpio_num;
switch (rq->type) {
case PTP_CLK_REQ_EXTTS:
index = rq->extts.index;
if (index < 0 || index >= N_EXT_TS)
return -EINVAL;
event_num = EXT_EVENT + index;
evnt = EVNT_WR | (event_num & EVNT_SEL_MASK) << EVNT_SEL_SHIFT;
if (on) {
gpio_num = gpio_tab[EXTTS0_GPIO + index];
evnt |= (gpio_num & EVNT_GPIO_MASK) << EVNT_GPIO_SHIFT;
evnt |= EVNT_RISE;
}
ext_write(0, phydev, PAGE5, PTP_EVNT, evnt);
return 0;
case PTP_CLK_REQ_PEROUT:
if (rq->perout.index != 0)
return -EINVAL;
periodic_output(clock, rq, on);
return 0;
default:
break;
}
return -EOPNOTSUPP;
}
static u8 status_frame_dst[6] = { 0x01, 0x1B, 0x19, 0x00, 0x00, 0x00 };
static u8 status_frame_src[6] = { 0x08, 0x00, 0x17, 0x0B, 0x6B, 0x0F };
static void enable_status_frames(struct phy_device *phydev, bool on)
{
u16 cfg0 = 0, ver;
if (on)
cfg0 = PSF_EVNT_EN | PSF_RXTS_EN | PSF_TXTS_EN | ENDIAN_FLAG;
ver = (PSF_PTPVER & VERSIONPTP_MASK) << VERSIONPTP_SHIFT;
ext_write(0, phydev, PAGE5, PSF_CFG0, cfg0);
ext_write(0, phydev, PAGE6, PSF_CFG1, ver);
if (!phydev->attached_dev) {
pr_warn("expected to find an attached netdevice\n");
return;
}
if (on) {
if (dev_mc_add(phydev->attached_dev, status_frame_dst))
pr_warn("failed to add mc address\n");
} else {
if (dev_mc_del(phydev->attached_dev, status_frame_dst))
pr_warn("failed to delete mc address\n");
}
}
static bool is_status_frame(struct sk_buff *skb, int type)
{
struct ethhdr *h = eth_hdr(skb);
if (PTP_CLASS_V2_L2 == type &&
!memcmp(h->h_source, status_frame_src, sizeof(status_frame_src)))
return true;
else
return false;
}
static int expired(struct rxts *rxts)
{
return time_after(jiffies, rxts->tmo);
}
/* Caller must hold rx_lock. */
static void prune_rx_ts(struct dp83640_private *dp83640)
{
struct list_head *this, *next;
struct rxts *rxts;
list_for_each_safe(this, next, &dp83640->rxts) {
rxts = list_entry(this, struct rxts, list);
if (expired(rxts)) {
list_del_init(&rxts->list);
list_add(&rxts->list, &dp83640->rxpool);
}
}
}
/* synchronize the phyters so they act as one clock */
static void enable_broadcast(struct phy_device *phydev, int init_page, int on)
{
int val;
phy_write(phydev, PAGESEL, 0);
val = phy_read(phydev, PHYCR2);
if (on)
val |= BC_WRITE;
else
val &= ~BC_WRITE;
phy_write(phydev, PHYCR2, val);
phy_write(phydev, PAGESEL, init_page);
}
static void recalibrate(struct dp83640_clock *clock)
{
s64 now, diff;
struct phy_txts event_ts;
struct timespec ts;
struct list_head *this;
struct dp83640_private *tmp;
struct phy_device *master = clock->chosen->phydev;
u16 cal_gpio, cfg0, evnt, ptp_trig, trigger, val;
trigger = CAL_TRIGGER;
cal_gpio = gpio_tab[CALIBRATE_GPIO];
mutex_lock(&clock->extreg_lock);
/*
* enable broadcast, disable status frames, enable ptp clock
*/
list_for_each(this, &clock->phylist) {
tmp = list_entry(this, struct dp83640_private, list);
enable_broadcast(tmp->phydev, clock->page, 1);
tmp->cfg0 = ext_read(tmp->phydev, PAGE5, PSF_CFG0);
ext_write(0, tmp->phydev, PAGE5, PSF_CFG0, 0);
ext_write(0, tmp->phydev, PAGE4, PTP_CTL, PTP_ENABLE);
}
enable_broadcast(master, clock->page, 1);
cfg0 = ext_read(master, PAGE5, PSF_CFG0);
ext_write(0, master, PAGE5, PSF_CFG0, 0);
ext_write(0, master, PAGE4, PTP_CTL, PTP_ENABLE);
/*
* enable an event timestamp
*/
evnt = EVNT_WR | EVNT_RISE | EVNT_SINGLE;
evnt |= (CAL_EVENT & EVNT_SEL_MASK) << EVNT_SEL_SHIFT;
evnt |= (cal_gpio & EVNT_GPIO_MASK) << EVNT_GPIO_SHIFT;
list_for_each(this, &clock->phylist) {
tmp = list_entry(this, struct dp83640_private, list);
ext_write(0, tmp->phydev, PAGE5, PTP_EVNT, evnt);
}
ext_write(0, master, PAGE5, PTP_EVNT, evnt);
/*
* configure a trigger
*/
ptp_trig = TRIG_WR | TRIG_IF_LATE | TRIG_PULSE;
ptp_trig |= (trigger & TRIG_CSEL_MASK) << TRIG_CSEL_SHIFT;
ptp_trig |= (cal_gpio & TRIG_GPIO_MASK) << TRIG_GPIO_SHIFT;
ext_write(0, master, PAGE5, PTP_TRIG, ptp_trig);
/* load trigger */
val = (trigger & TRIG_SEL_MASK) << TRIG_SEL_SHIFT;
val |= TRIG_LOAD;
ext_write(0, master, PAGE4, PTP_CTL, val);
/* enable trigger */
val &= ~TRIG_LOAD;
val |= TRIG_EN;
ext_write(0, master, PAGE4, PTP_CTL, val);
/* disable trigger */
val = (trigger & TRIG_SEL_MASK) << TRIG_SEL_SHIFT;
val |= TRIG_DIS;
ext_write(0, master, PAGE4, PTP_CTL, val);
/*
* read out and correct offsets
*/
val = ext_read(master, PAGE4, PTP_STS);
pr_info("master PTP_STS 0x%04hx\n", val);
val = ext_read(master, PAGE4, PTP_ESTS);
pr_info("master PTP_ESTS 0x%04hx\n", val);
event_ts.ns_lo = ext_read(master, PAGE4, PTP_EDATA);
event_ts.ns_hi = ext_read(master, PAGE4, PTP_EDATA);
event_ts.sec_lo = ext_read(master, PAGE4, PTP_EDATA);
event_ts.sec_hi = ext_read(master, PAGE4, PTP_EDATA);
now = phy2txts(&event_ts);
list_for_each(this, &clock->phylist) {
tmp = list_entry(this, struct dp83640_private, list);
val = ext_read(tmp->phydev, PAGE4, PTP_STS);
pr_info("slave PTP_STS 0x%04hx\n", val);
val = ext_read(tmp->phydev, PAGE4, PTP_ESTS);
pr_info("slave PTP_ESTS 0x%04hx\n", val);
event_ts.ns_lo = ext_read(tmp->phydev, PAGE4, PTP_EDATA);
event_ts.ns_hi = ext_read(tmp->phydev, PAGE4, PTP_EDATA);
event_ts.sec_lo = ext_read(tmp->phydev, PAGE4, PTP_EDATA);
event_ts.sec_hi = ext_read(tmp->phydev, PAGE4, PTP_EDATA);
diff = now - (s64) phy2txts(&event_ts);
pr_info("slave offset %lld nanoseconds\n", diff);
diff += ADJTIME_FIX;
ts = ns_to_timespec(diff);
tdr_write(0, tmp->phydev, &ts, PTP_STEP_CLK);
}
/*
* restore status frames
*/
list_for_each(this, &clock->phylist) {
tmp = list_entry(this, struct dp83640_private, list);
ext_write(0, tmp->phydev, PAGE5, PSF_CFG0, tmp->cfg0);
}
ext_write(0, master, PAGE5, PSF_CFG0, cfg0);
mutex_unlock(&clock->extreg_lock);
}
/* time stamping methods */
static inline u16 exts_chan_to_edata(int ch)
{
return 1 << ((ch + EXT_EVENT) * 2);
}
static int decode_evnt(struct dp83640_private *dp83640,
void *data, u16 ests)
{
struct phy_txts *phy_txts;
struct ptp_clock_event event;
int i, parsed;
int words = (ests >> EVNT_TS_LEN_SHIFT) & EVNT_TS_LEN_MASK;
u16 ext_status = 0;
if (ests & MULT_EVNT) {
ext_status = *(u16 *) data;
data += sizeof(ext_status);
}
phy_txts = data;
switch (words) { /* fall through in every case */
case 3:
dp83640->edata.sec_hi = phy_txts->sec_hi;
case 2:
dp83640->edata.sec_lo = phy_txts->sec_lo;
case 1:
dp83640->edata.ns_hi = phy_txts->ns_hi;
case 0:
dp83640->edata.ns_lo = phy_txts->ns_lo;
}
if (ext_status) {
parsed = words + 2;
} else {
parsed = words + 1;
i = ((ests >> EVNT_NUM_SHIFT) & EVNT_NUM_MASK) - EXT_EVENT;
ext_status = exts_chan_to_edata(i);
}
event.type = PTP_CLOCK_EXTTS;
event.timestamp = phy2txts(&dp83640->edata);
for (i = 0; i < N_EXT_TS; i++) {
if (ext_status & exts_chan_to_edata(i)) {
event.index = i;
ptp_clock_event(dp83640->clock->ptp_clock, &event);
}
}
return parsed * sizeof(u16);
}
static void decode_rxts(struct dp83640_private *dp83640,
struct phy_rxts *phy_rxts)
{
struct rxts *rxts;
unsigned long flags;
spin_lock_irqsave(&dp83640->rx_lock, flags);
prune_rx_ts(dp83640);
if (list_empty(&dp83640->rxpool)) {
pr_debug("rx timestamp pool is empty\n");
goto out;
}
rxts = list_first_entry(&dp83640->rxpool, struct rxts, list);
list_del_init(&rxts->list);
phy2rxts(phy_rxts, rxts);
list_add_tail(&rxts->list, &dp83640->rxts);
out:
spin_unlock_irqrestore(&dp83640->rx_lock, flags);
}
static void decode_txts(struct dp83640_private *dp83640,
struct phy_txts *phy_txts)
{
struct skb_shared_hwtstamps shhwtstamps;
struct sk_buff *skb;
u64 ns;
/* We must already have the skb that triggered this. */
skb = skb_dequeue(&dp83640->tx_queue);
if (!skb) {
pr_debug("have timestamp but tx_queue empty\n");
return;
}
ns = phy2txts(phy_txts);
memset(&shhwtstamps, 0, sizeof(shhwtstamps));
shhwtstamps.hwtstamp = ns_to_ktime(ns);
skb_complete_tx_timestamp(skb, &shhwtstamps);
}
static void decode_status_frame(struct dp83640_private *dp83640,
struct sk_buff *skb)
{
struct phy_rxts *phy_rxts;
struct phy_txts *phy_txts;
u8 *ptr;
int len, size;
u16 ests, type;
ptr = skb->data + 2;
for (len = skb_headlen(skb) - 2; len > sizeof(type); len -= size) {
type = *(u16 *)ptr;
ests = type & 0x0fff;
type = type & 0xf000;
len -= sizeof(type);
ptr += sizeof(type);
if (PSF_RX == type && len >= sizeof(*phy_rxts)) {
phy_rxts = (struct phy_rxts *) ptr;
decode_rxts(dp83640, phy_rxts);
size = sizeof(*phy_rxts);
} else if (PSF_TX == type && len >= sizeof(*phy_txts)) {
phy_txts = (struct phy_txts *) ptr;
decode_txts(dp83640, phy_txts);
size = sizeof(*phy_txts);
} else if (PSF_EVNT == type && len >= sizeof(*phy_txts)) {
size = decode_evnt(dp83640, ptr, ests);
} else {
size = 0;
break;
}
ptr += size;
}
}
static int is_sync(struct sk_buff *skb, int type)
{
u8 *data = skb->data, *msgtype;
unsigned int offset = 0;
switch (type) {
case PTP_CLASS_V1_IPV4:
case PTP_CLASS_V2_IPV4:
offset = ETH_HLEN + IPV4_HLEN(data) + UDP_HLEN;
break;
case PTP_CLASS_V1_IPV6:
case PTP_CLASS_V2_IPV6:
offset = OFF_PTP6;
break;
case PTP_CLASS_V2_L2:
offset = ETH_HLEN;
break;
case PTP_CLASS_V2_VLAN:
offset = ETH_HLEN + VLAN_HLEN;
break;
default:
return 0;
}
if (type & PTP_CLASS_V1)
offset += OFF_PTP_CONTROL;
if (skb->len < offset + 1)
return 0;
msgtype = data + offset;
return (*msgtype & 0xf) == 0;
}
static int match(struct sk_buff *skb, unsigned int type, struct rxts *rxts)
{
u16 *seqid;
unsigned int offset;
u8 *msgtype, *data = skb_mac_header(skb);
/* check sequenceID, messageType, 12 bit hash of offset 20-29 */
switch (type) {
case PTP_CLASS_V1_IPV4:
case PTP_CLASS_V2_IPV4:
offset = ETH_HLEN + IPV4_HLEN(data) + UDP_HLEN;
break;
case PTP_CLASS_V1_IPV6:
case PTP_CLASS_V2_IPV6:
offset = OFF_PTP6;
break;
case PTP_CLASS_V2_L2:
offset = ETH_HLEN;
break;
case PTP_CLASS_V2_VLAN:
offset = ETH_HLEN + VLAN_HLEN;
break;
default:
return 0;
}
if (skb->len + ETH_HLEN < offset + OFF_PTP_SEQUENCE_ID + sizeof(*seqid))
return 0;
if (unlikely(type & PTP_CLASS_V1))
msgtype = data + offset + OFF_PTP_CONTROL;
else
msgtype = data + offset;
seqid = (u16 *)(data + offset + OFF_PTP_SEQUENCE_ID);
return (rxts->msgtype == (*msgtype & 0xf) &&
rxts->seqid == ntohs(*seqid));
}
static void dp83640_free_clocks(void)
{
struct dp83640_clock *clock;
struct list_head *this, *next;
mutex_lock(&phyter_clocks_lock);
list_for_each_safe(this, next, &phyter_clocks) {
clock = list_entry(this, struct dp83640_clock, list);
if (!list_empty(&clock->phylist)) {
pr_warn("phy list non-empty while unloading\n");
BUG();
}
list_del(&clock->list);
mutex_destroy(&clock->extreg_lock);
mutex_destroy(&clock->clock_lock);
put_device(&clock->bus->dev);
kfree(clock);
}
mutex_unlock(&phyter_clocks_lock);
}
static void dp83640_clock_init(struct dp83640_clock *clock, struct mii_bus *bus)
{
INIT_LIST_HEAD(&clock->list);
clock->bus = bus;
mutex_init(&clock->extreg_lock);
mutex_init(&clock->clock_lock);
INIT_LIST_HEAD(&clock->phylist);
clock->caps.owner = THIS_MODULE;
sprintf(clock->caps.name, "dp83640 timer");
clock->caps.max_adj = 1953124;
clock->caps.n_alarm = 0;
clock->caps.n_ext_ts = N_EXT_TS;
clock->caps.n_per_out = 1;
clock->caps.pps = 0;
clock->caps.adjfreq = ptp_dp83640_adjfreq;
clock->caps.adjtime = ptp_dp83640_adjtime;
clock->caps.gettime = ptp_dp83640_gettime;
clock->caps.settime = ptp_dp83640_settime;
clock->caps.enable = ptp_dp83640_enable;
/*
* Get a reference to this bus instance.
*/
get_device(&bus->dev);
}
static int choose_this_phy(struct dp83640_clock *clock,
struct phy_device *phydev)
{
if (chosen_phy == -1 && !clock->chosen)
return 1;
if (chosen_phy == phydev->addr)
return 1;
return 0;
}
static struct dp83640_clock *dp83640_clock_get(struct dp83640_clock *clock)
{
if (clock)
mutex_lock(&clock->clock_lock);
return clock;
}
/*
* Look up and lock a clock by bus instance.
* If there is no clock for this bus, then create it first.
*/
static struct dp83640_clock *dp83640_clock_get_bus(struct mii_bus *bus)
{
struct dp83640_clock *clock = NULL, *tmp;
struct list_head *this;
mutex_lock(&phyter_clocks_lock);
list_for_each(this, &phyter_clocks) {
tmp = list_entry(this, struct dp83640_clock, list);
if (tmp->bus == bus) {
clock = tmp;
break;
}
}
if (clock)
goto out;
clock = kzalloc(sizeof(struct dp83640_clock), GFP_KERNEL);
if (!clock)
goto out;
dp83640_clock_init(clock, bus);
list_add_tail(&phyter_clocks, &clock->list);
out:
mutex_unlock(&phyter_clocks_lock);
return dp83640_clock_get(clock);
}
static void dp83640_clock_put(struct dp83640_clock *clock)
{
mutex_unlock(&clock->clock_lock);
}
static int dp83640_probe(struct phy_device *phydev)
{
struct dp83640_clock *clock;
struct dp83640_private *dp83640;
int err = -ENOMEM, i;
if (phydev->addr == BROADCAST_ADDR)
return 0;
clock = dp83640_clock_get_bus(phydev->bus);
if (!clock)
goto no_clock;
dp83640 = kzalloc(sizeof(struct dp83640_private), GFP_KERNEL);
if (!dp83640)
goto no_memory;
dp83640->phydev = phydev;
INIT_WORK(&dp83640->ts_work, rx_timestamp_work);
INIT_LIST_HEAD(&dp83640->rxts);
INIT_LIST_HEAD(&dp83640->rxpool);
for (i = 0; i < MAX_RXTS; i++)
list_add(&dp83640->rx_pool_data[i].list, &dp83640->rxpool);
phydev->priv = dp83640;
spin_lock_init(&dp83640->rx_lock);
skb_queue_head_init(&dp83640->rx_queue);
skb_queue_head_init(&dp83640->tx_queue);
dp83640->clock = clock;
if (choose_this_phy(clock, phydev)) {
clock->chosen = dp83640;
clock->ptp_clock = ptp_clock_register(&clock->caps, &phydev->dev);
if (IS_ERR(clock->ptp_clock)) {
err = PTR_ERR(clock->ptp_clock);
goto no_register;
}
} else
list_add_tail(&dp83640->list, &clock->phylist);
if (clock->chosen && !list_empty(&clock->phylist))
recalibrate(clock);
else
enable_broadcast(dp83640->phydev, clock->page, 1);
dp83640_clock_put(clock);
return 0;
no_register:
clock->chosen = NULL;