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FEC: Add time stamping code and a PTP hardware clock 

This patch adds a driver for the FEC(MX6) that offers time
stamping and a PTP haderware clock. Because FEC\ENET(MX6)
hardware frequency adjustment is complex, we have implemented
this in software by changing the multiplication factor of the
timecounter.

Signed-off-by: Frank Li <Frank.Li@freescale.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Frank Li 2012-10-30 18:25:31 +00:00 коммит произвёл David S. Miller
Родитель d6e0d9fcbb
Коммит 6605b730c0
5 изменённых файлов: 520 добавлений и 1 удалений
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9
drivers/net/ethernet/freescale/Kconfig
Просмотреть файл

@ -92,4 +92,13 @@ config GIANFAR
This driver supports the Gigabit TSEC on the MPC83xx, MPC85xx,
and MPC86xx family of chips, and the FEC on the 8540.
config FEC_PTP
bool "PTP Hardware Clock (PHC)"
depends on FEC
select PPS
select PTP_1588_CLOCK
--help---
Say Y here if you want to use PTP Hardware Clock (PHC) in the
driver. Only the basic clock operations have been implemented.
endif # NET_VENDOR_FREESCALE

1
drivers/net/ethernet/freescale/Makefile
Просмотреть файл

@ -3,6 +3,7 @@
#
obj-$(CONFIG_FEC) += fec.o
obj-$(CONFIG_FEC_PTP) += fec_ptp.o
obj-$(CONFIG_FEC_MPC52xx) += fec_mpc52xx.o
ifeq ($(CONFIG_FEC_MPC52xx_MDIO),y)
obj-$(CONFIG_FEC_MPC52xx) += fec_mpc52xx_phy.o

88
drivers/net/ethernet/freescale/fec.c
Просмотреть файл

@ -280,6 +280,17 @@ fec_enet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
| BD_ENET_TX_LAST | BD_ENET_TX_TC);
bdp->cbd_sc = status;
#ifdef CONFIG_FEC_PTP
bdp->cbd_bdu = 0;
if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP &&
fep->hwts_tx_en)) {
bdp->cbd_esc = (BD_ENET_TX_TS | BD_ENET_TX_INT);
skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
} else {
bdp->cbd_esc = BD_ENET_TX_INT;
}
#endif
/* Trigger transmission start */
writel(0, fep->hwp + FEC_X_DES_ACTIVE);
@ -437,10 +448,17 @@ fec_restart(struct net_device *ndev, int duplex)
writel(1 << 8, fep->hwp + FEC_X_WMRK);
}
#ifdef CONFIG_FEC_PTP
ecntl |= (1 << 4);
#endif
/* And last, enable the transmit and receive processing */
writel(ecntl, fep->hwp + FEC_ECNTRL);
writel(0, fep->hwp + FEC_R_DES_ACTIVE);
#ifdef CONFIG_FEC_PTP
fec_ptp_start_cyclecounter(ndev);
#endif
/* Enable interrupts we wish to service */
writel(FEC_DEFAULT_IMASK, fep->hwp + FEC_IMASK);
}
@ -526,6 +544,19 @@ fec_enet_tx(struct net_device *ndev)
ndev->stats.tx_packets++;
}
#ifdef CONFIG_FEC_PTP
if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_IN_PROGRESS)) {
struct skb_shared_hwtstamps shhwtstamps;
unsigned long flags;
memset(&shhwtstamps, 0, sizeof(shhwtstamps));
spin_lock_irqsave(&fep->tmreg_lock, flags);
shhwtstamps.hwtstamp = ns_to_ktime(
timecounter_cyc2time(&fep->tc, bdp->ts));
spin_unlock_irqrestore(&fep->tmreg_lock, flags);
skb_tstamp_tx(skb, &shhwtstamps);
}
#endif
if (status & BD_ENET_TX_READY)
printk("HEY! Enet xmit interrupt and TX_READY.\n");
@ -652,6 +683,21 @@ fec_enet_rx(struct net_device *ndev)
skb_put(skb, pkt_len - 4); /* Make room */
skb_copy_to_linear_data(skb, data, pkt_len - 4);
skb->protocol = eth_type_trans(skb, ndev);
#ifdef CONFIG_FEC_PTP
/* Get receive timestamp from the skb */
if (fep->hwts_rx_en) {
struct skb_shared_hwtstamps *shhwtstamps =
skb_hwtstamps(skb);
unsigned long flags;
memset(shhwtstamps, 0, sizeof(*shhwtstamps));
spin_lock_irqsave(&fep->tmreg_lock, flags);
shhwtstamps->hwtstamp = ns_to_ktime(
timecounter_cyc2time(&fep->tc, bdp->ts));
spin_unlock_irqrestore(&fep->tmreg_lock, flags);
}
#endif
if (!skb_defer_rx_timestamp(skb))
netif_rx(skb);
}
@ -666,6 +712,12 @@ rx_processing_done:
status |= BD_ENET_RX_EMPTY;
bdp->cbd_sc = status;
#ifdef CONFIG_FEC_PTP
bdp->cbd_esc = BD_ENET_RX_INT;
bdp->cbd_prot = 0;
bdp->cbd_bdu = 0;
#endif
/* Update BD pointer to next entry */
if (status & BD_ENET_RX_WRAP)
bdp = fep->rx_bd_base;
@ -1105,6 +1157,10 @@ static int fec_enet_ioctl(struct net_device *ndev, struct ifreq *rq, int cmd)
if (!phydev)
return -ENODEV;
#ifdef CONFIG_FEC_PTP
if (cmd == SIOCSHWTSTAMP)
return fec_ptp_ioctl(ndev, rq, cmd);
#endif
return phy_mii_ioctl(phydev, rq, cmd);
}
@ -1151,6 +1207,9 @@ static int fec_enet_alloc_buffers(struct net_device *ndev)
bdp->cbd_bufaddr = dma_map_single(&fep->pdev->dev, skb->data,
FEC_ENET_RX_FRSIZE, DMA_FROM_DEVICE);
bdp->cbd_sc = BD_ENET_RX_EMPTY;
#ifdef CONFIG_FEC_PTP
bdp->cbd_esc = BD_ENET_RX_INT;
#endif
bdp++;
}
@ -1164,6 +1223,10 @@ static int fec_enet_alloc_buffers(struct net_device *ndev)
bdp->cbd_sc = 0;
bdp->cbd_bufaddr = 0;
#ifdef CONFIG_FEC_PTP
bdp->cbd_esc = BD_ENET_RX_INT;
#endif
bdp++;
}
@ -1565,9 +1628,19 @@ fec_probe(struct platform_device *pdev)
goto failed_clk;
}
#ifdef CONFIG_FEC_PTP
fep->clk_ptp = devm_clk_get(&pdev->dev, "ptp");
if (IS_ERR(fep->clk_ptp)) {
ret = PTR_ERR(fep->clk_ptp);
goto failed_clk;
}
#endif
clk_prepare_enable(fep->clk_ahb);
clk_prepare_enable(fep->clk_ipg);
#ifdef CONFIG_FEC_PTP
clk_prepare_enable(fep->clk_ptp);
#endif
reg_phy = devm_regulator_get(&pdev->dev, "phy");
if (!IS_ERR(reg_phy)) {
ret = regulator_enable(reg_phy);
@ -1595,6 +1668,10 @@ fec_probe(struct platform_device *pdev)
if (ret)
goto failed_register;
#ifdef CONFIG_FEC_PTP
fec_ptp_init(ndev, pdev);
#endif
return 0;
failed_register:
@ -1604,6 +1681,9 @@ failed_init:
failed_regulator:
clk_disable_unprepare(fep->clk_ahb);
clk_disable_unprepare(fep->clk_ipg);
#ifdef CONFIG_FEC_PTP
clk_disable_unprepare(fep->clk_ptp);
#endif
failed_pin:
failed_clk:
for (i = 0; i < FEC_IRQ_NUM; i++) {
@ -1636,6 +1716,12 @@ fec_drv_remove(struct platform_device *pdev)
if (irq > 0)
free_irq(irq, ndev);
}
#ifdef CONFIG_FEC_PTP
del_timer_sync(&fep->time_keep);
clk_disable_unprepare(fep->clk_ptp);
if (fep->ptp_clock)
ptp_clock_unregister(fep->ptp_clock);
#endif
clk_disable_unprepare(fep->clk_ahb);
clk_disable_unprepare(fep->clk_ipg);
iounmap(fep->hwp);

38
drivers/net/ethernet/freescale/fec.h
Просмотреть файл

@ -13,6 +13,12 @@
#define FEC_H
/****************************************************************************/
#ifdef CONFIG_FEC_PTP
#include <linux/clocksource.h>
#include <linux/net_tstamp.h>
#include <linux/ptp_clock_kernel.h>
#endif
#if defined(CONFIG_M523x) || defined(CONFIG_M527x) || defined(CONFIG_M528x) || \
defined(CONFIG_M520x) || defined(CONFIG_M532x) || \
defined(CONFIG_ARCH_MXC) || defined(CONFIG_SOC_IMX28)
@ -88,6 +94,13 @@ struct bufdesc {
unsigned short cbd_datlen; /* Data length */
unsigned short cbd_sc; /* Control and status info */
unsigned long cbd_bufaddr; /* Buffer address */
#ifdef CONFIG_FEC_PTP
unsigned long cbd_esc;
unsigned long cbd_prot;
unsigned long cbd_bdu;
unsigned long ts;
unsigned short res0[4];
#endif
};
#else
struct bufdesc {
@ -190,6 +203,9 @@ struct fec_enet_private {
struct clk *clk_ipg;
struct clk *clk_ahb;
#ifdef CONFIG_FEC_PTP
struct clk *clk_ptp;
#endif
/* The saved address of a sent-in-place packet/buffer, for skfree(). */
unsigned char *tx_bounce[TX_RING_SIZE];
@ -227,7 +243,29 @@ struct fec_enet_private {
int full_duplex;
struct completion mdio_done;
int irq[FEC_IRQ_NUM];
#ifdef CONFIG_FEC_PTP
struct ptp_clock *ptp_clock;
struct ptp_clock_info ptp_caps;
unsigned long last_overflow_check;
spinlock_t tmreg_lock;
struct cyclecounter cc;
struct timecounter tc;
int rx_hwtstamp_filter;
u32 base_incval;
u32 cycle_speed;
int hwts_rx_en;
int hwts_tx_en;
struct timer_list time_keep;
#endif
};
#ifdef CONFIG_FEC_PTP
void fec_ptp_init(struct net_device *ndev, struct platform_device *pdev);
void fec_ptp_start_cyclecounter(struct net_device *ndev);
int fec_ptp_ioctl(struct net_device *ndev, struct ifreq *ifr, int cmd);
#endif
/****************************************************************************/
#endif /* FEC_H */

385
drivers/net/ethernet/freescale/fec_ptp.c Normal file
Просмотреть файл

@ -0,0 +1,385 @@
/*
* Fast Ethernet Controller (ENET) PTP driver for MX6x.
*
* Copyright (C) 2012 Freescale Semiconductor, Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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.,
* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/ptrace.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/spinlock.h>
#include <linux/workqueue.h>
#include <linux/bitops.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/clk.h>
#include <linux/platform_device.h>
#include <linux/phy.h>
#include <linux/fec.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_gpio.h>
#include <linux/of_net.h>
#include "fec.h"
/* FEC 1588 register bits */
#define FEC_T_CTRL_SLAVE 0x00002000
#define FEC_T_CTRL_CAPTURE 0x00000800
#define FEC_T_CTRL_RESTART 0x00000200
#define FEC_T_CTRL_PERIOD_RST 0x00000030
#define FEC_T_CTRL_PERIOD_EN 0x00000010
#define FEC_T_CTRL_ENABLE 0x00000001
#define FEC_T_INC_MASK 0x0000007f
#define FEC_T_INC_OFFSET 0
#define FEC_T_INC_CORR_MASK 0x00007f00
#define FEC_T_INC_CORR_OFFSET 8
#define FEC_ATIME_CTRL 0x400
#define FEC_ATIME 0x404
#define FEC_ATIME_EVT_OFFSET 0x408
#define FEC_ATIME_EVT_PERIOD 0x40c
#define FEC_ATIME_CORR 0x410
#define FEC_ATIME_INC 0x414
#define FEC_TS_TIMESTAMP 0x418
#define FEC_CC_MULT (1 << 31)
/**
* fec_ptp_read - read raw cycle counter (to be used by time counter)
* @cc: the cyclecounter structure
*
* this function reads the cyclecounter registers and is called by the
* cyclecounter structure used to construct a ns counter from the
* arbitrary fixed point registers
*/
static cycle_t fec_ptp_read(const struct cyclecounter *cc)
{
struct fec_enet_private *fep =
container_of(cc, struct fec_enet_private, cc);
u32 tempval;
tempval = readl(fep->hwp + FEC_ATIME_CTRL);
tempval |= FEC_T_CTRL_CAPTURE;
writel(tempval, fep->hwp + FEC_ATIME_CTRL);
return readl(fep->hwp + FEC_ATIME);
}
/**
* fec_ptp_start_cyclecounter - create the cycle counter from hw
* @ndev: network device
*
* this function initializes the timecounter and cyclecounter
* structures for use in generated a ns counter from the arbitrary
* fixed point cycles registers in the hardware.
*/
void fec_ptp_start_cyclecounter(struct net_device *ndev)
{
struct fec_enet_private *fep = netdev_priv(ndev);
unsigned long flags;
int inc;
inc = 1000000000 / clk_get_rate(fep->clk_ptp);
/* grab the ptp lock */
spin_lock_irqsave(&fep->tmreg_lock, flags);
/* 1ns counter */
writel(inc << FEC_T_INC_OFFSET, fep->hwp + FEC_ATIME_INC);
/* use free running count */
writel(0, fep->hwp + FEC_ATIME_EVT_PERIOD);
writel(FEC_T_CTRL_ENABLE, fep->hwp + FEC_ATIME_CTRL);
memset(&fep->cc, 0, sizeof(fep->cc));
fep->cc.read = fec_ptp_read;
fep->cc.mask = CLOCKSOURCE_MASK(32);
fep->cc.shift = 31;
fep->cc.mult = FEC_CC_MULT;
/* reset the ns time counter */
timecounter_init(&fep->tc, &fep->cc, ktime_to_ns(ktime_get_real()));
spin_unlock_irqrestore(&fep->tmreg_lock, flags);
}
/**
* fec_ptp_adjfreq - adjust ptp cycle frequency
* @ptp: the ptp clock structure
* @ppb: parts per billion adjustment from base
*
* Adjust the frequency of the ptp cycle counter by the
* indicated ppb from the base frequency.
*
* Because ENET hardware frequency adjust is complex,
* using software method to do that.
*/
static int fec_ptp_adjfreq(struct ptp_clock_info *ptp, s32 ppb)
{
u64 diff;
unsigned long flags;
int neg_adj = 0;
struct fec_enet_private *fep =
container_of(ptp, struct fec_enet_private, ptp_caps);
if (ppb < 0) {
ppb = -ppb;
neg_adj = 1;
}
spin_lock_irqsave(&fep->tmreg_lock, flags);
/*
* dummy read to set cycle_last in tc to now.
* So use adjusted mult to calculate when next call
* timercounter_read.
*/
timecounter_read(&fep->tc);
fep->cc.mult = FEC_CC_MULT;
diff = fep->cc.mult;
diff *= ppb;
diff = div_u64(diff, 1000000000ULL);
if (neg_adj)
fep->cc.mult -= diff;
else
fep->cc.mult += diff;
spin_unlock_irqrestore(&fep->tmreg_lock, flags);
return 0;
}
/**
* fec_ptp_adjtime
* @ptp: the ptp clock structure
* @delta: offset to adjust the cycle counter by
*
* adjust the timer by resetting the timecounter structure.
*/
static int fec_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
{
struct fec_enet_private *fep =
container_of(ptp, struct fec_enet_private, ptp_caps);
unsigned long flags;
u64 now;
spin_lock_irqsave(&fep->tmreg_lock, flags);
now = timecounter_read(&fep->tc);
now += delta;
/* reset the timecounter */
timecounter_init(&fep->tc, &fep->cc, now);
spin_unlock_irqrestore(&fep->tmreg_lock, flags);
return 0;
}
/**
* fec_ptp_gettime
* @ptp: the ptp clock structure
* @ts: timespec structure to hold the current time value
*
* read the timecounter and return the correct value on ns,
* after converting it into a struct timespec.
*/
static int fec_ptp_gettime(struct ptp_clock_info *ptp, struct timespec *ts)
{
struct fec_enet_private *adapter =
container_of(ptp, struct fec_enet_private, ptp_caps);
u64 ns;
u32 remainder;
unsigned long flags;
spin_lock_irqsave(&adapter->tmreg_lock, flags);
ns = timecounter_read(&adapter->tc);
spin_unlock_irqrestore(&adapter->tmreg_lock, flags);
ts->tv_sec = div_u64_rem(ns, 1000000000ULL, &remainder);
ts->tv_nsec = remainder;
return 0;
}
/**
* fec_ptp_settime
* @ptp: the ptp clock structure
* @ts: the timespec containing the new time for the cycle counter
*
* reset the timecounter to use a new base value instead of the kernel
* wall timer value.
*/
static int fec_ptp_settime(struct ptp_clock_info *ptp,
const struct timespec *ts)
{
struct fec_enet_private *fep =
container_of(ptp, struct fec_enet_private, ptp_caps);
u64 ns;
unsigned long flags;
ns = ts->tv_sec * 1000000000ULL;
ns += ts->tv_nsec;
spin_lock_irqsave(&fep->tmreg_lock, flags);
timecounter_init(&fep->tc, &fep->cc, ns);
spin_unlock_irqrestore(&fep->tmreg_lock, flags);
return 0;
}
/**
* fec_ptp_enable
* @ptp: the ptp clock structure
* @rq: the requested feature to change
* @on: whether to enable or disable the feature
*
*/
static int fec_ptp_enable(struct ptp_clock_info *ptp,
struct ptp_clock_request *rq, int on)
{
return -EOPNOTSUPP;
}
/**
* fec_ptp_hwtstamp_ioctl - control hardware time stamping
* @ndev: pointer to net_device
* @ifreq: ioctl data
* @cmd: particular ioctl requested
*/
int fec_ptp_ioctl(struct net_device *ndev, struct ifreq *ifr, int cmd)
{
struct fec_enet_private *fep = netdev_priv(ndev);
struct hwtstamp_config config;
if (copy_from_user(&config, ifr->ifr_data, sizeof(config)))
return -EFAULT;
/* reserved for future extensions */
if (config.flags)
return -EINVAL;
switch (config.tx_type) {
case HWTSTAMP_TX_OFF:
fep->hwts_tx_en = 0;
break;
case HWTSTAMP_TX_ON:
fep->hwts_tx_en = 1;
break;
default:
return -ERANGE;
}
switch (config.rx_filter) {
case HWTSTAMP_FILTER_NONE:
if (fep->hwts_rx_en)
fep->hwts_rx_en = 0;
config.rx_filter = HWTSTAMP_FILTER_NONE;
break;
default:
/*
* register RXMTRL must be set in order to do V1 packets,
* therefore it is not possible to time stamp both V1 Sync and
* Delay_Req messages and hardware does not support
* timestamping all packets => return error
*/
fep->hwts_rx_en = 1;
config.rx_filter = HWTSTAMP_FILTER_ALL;
break;
}
return copy_to_user(ifr->ifr_data, &config, sizeof(config)) ?
-EFAULT : 0;
}
/**
* fec_time_keep - call timecounter_read every second to avoid timer overrun
* because ENET just support 32bit counter, will timeout in 4s
*/
static void fec_time_keep(unsigned long _data)
{
struct fec_enet_private *fep = (struct fec_enet_private *)_data;
u64 ns;
unsigned long flags;
spin_lock_irqsave(&fep->tmreg_lock, flags);
ns = timecounter_read(&fep->tc);
spin_unlock_irqrestore(&fep->tmreg_lock, flags);
mod_timer(&fep->time_keep, jiffies + HZ);
}
/**
* fec_ptp_init
* @ndev: The FEC network adapter
*
* This function performs the required steps for enabling ptp
* support. If ptp support has already been loaded it simply calls the
* cyclecounter init routine and exits.
*/
void fec_ptp_init(struct net_device *ndev, struct platform_device *pdev)
{
struct fec_enet_private *fep = netdev_priv(ndev);
fep->ptp_caps.owner = THIS_MODULE;
snprintf(fep->ptp_caps.name, 16, "fec ptp");
fep->ptp_caps.max_adj = 250000000;
fep->ptp_caps.n_alarm = 0;
fep->ptp_caps.n_ext_ts = 0;
fep->ptp_caps.n_per_out = 0;
fep->ptp_caps.pps = 0;
fep->ptp_caps.adjfreq = fec_ptp_adjfreq;
fep->ptp_caps.adjtime = fec_ptp_adjtime;
fep->ptp_caps.gettime = fec_ptp_gettime;
fep->ptp_caps.settime = fec_ptp_settime;
fep->ptp_caps.enable = fec_ptp_enable;
spin_lock_init(&fep->tmreg_lock);
fec_ptp_start_cyclecounter(ndev);
init_timer(&fep->time_keep);
fep->time_keep.data = (unsigned long)fep;
fep->time_keep.function = fec_time_keep;
fep->time_keep.expires = jiffies + HZ;
add_timer(&fep->time_keep);
fep->ptp_clock = ptp_clock_register(&fep->ptp_caps, &pdev->dev);
if (IS_ERR(fep->ptp_clock)) {
fep->ptp_clock = NULL;
pr_err("ptp_clock_register failed\n");
} else {
pr_info("registered PHC device on %s\n", ndev->name);
}
}