On Tue, Jun 15, 2010 at 10:10 AM, Richard Cochran
<richardcoch...@gmail.com> wrote:
> This patch adds a driver for the hardware time stamping unit found on the
> IXP465. Only the basic clock operations are implemented.
>
> Signed-off-by: Richard Cochran <richard.coch...@omicron.at>
Hi Richard,
Comments below...
> ---
> arch/arm/mach-ixp4xx/include/mach/ixp46x_ts.h | 67 +++++++
> drivers/net/arm/ixp4xx_eth.c | 194 +++++++++++++++++++++
> drivers/ptp/Kconfig | 13 ++
> drivers/ptp/Makefile | 1 +
> drivers/ptp/ptp_ixp46x.c | 231
> +++++++++++++++++++++++++
> 5 files changed, 506 insertions(+), 0 deletions(-)
> create mode 100644 arch/arm/mach-ixp4xx/include/mach/ixp46x_ts.h
> create mode 100644 drivers/ptp/ptp_ixp46x.c
>
> diff --git a/arch/arm/mach-ixp4xx/include/mach/ixp46x_ts.h
> b/arch/arm/mach-ixp4xx/include/mach/ixp46x_ts.h
> new file mode 100644
> index 0000000..7fb02b6
> --- /dev/null
> +++ b/arch/arm/mach-ixp4xx/include/mach/ixp46x_ts.h
> @@ -0,0 +1,67 @@
> +/*
> + * PTP 1588 clock using the IXP46X
> + *
> + * 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.
> + */
> +
> +#ifndef _IXP46X_TS_H_
> +#define _IXP46X_TS_H_
> +
> +#define DEFAULT_ADDEND 0xF0000029
> +#define TICKS_NS_SHIFT 4
> +
> +struct ixp46x_channel_ctl {
> + u32 Ch_Control; /* 0x40 Time Synchronization Channel Control */
> + u32 Ch_Event; /* 0x44 Time Synchronization Channel Event */
> + u32 TxSnapLo; /* 0x48 Transmit Snapshot Low Register */
> + u32 TxSnapHi; /* 0x4C Transmit Snapshot High Register */
> + u32 RxSnapLo; /* 0x50 Receive Snapshot Low Register */
> + u32 RxSnapHi; /* 0x54 Receive Snapshot High Register */
> + u32 SrcUUIDLo; /* 0x58 Source UUID0 Low Register */
> + u32 SrcUUIDHi; /* 0x5C Sequence Identifier/Source UUID0 High */
> +};
Nitpick. We use all lower case names for structures in Linux.
> +
> +struct ixp46x_ts_regs {
> + u32 Control; /* 0x00 Time Sync Control Register */
> + u32 Event; /* 0x04 Time Sync Event Register */
> + u32 Addend; /* 0x08 Time Sync Addend Register */
> + u32 Accum; /* 0x0C Time Sync Accumulator Register */
> + u32 Test; /* 0x10 Time Sync Test Register */
> + u32 Unused; /* 0x14 */
> + u32 RSysTime_Lo; /* 0x18 RawSystemTime_Low Register */
> + u32 RSysTimeHi; /* 0x1C RawSystemTime_High Register */
> + u32 SysTimeLo; /* 0x20 SystemTime_Low Register */
> + u32 SysTimeHi; /* 0x24 SystemTime_High Register */
> + u32 TrgtLo; /* 0x28 TargetTime_Low Register */
> + u32 TrgtHi; /* 0x2C TargetTime_High Register */
> + u32 ASMSLo; /* 0x30 Auxiliary Slave Mode Snapshot Low */
> + u32 ASMSHi; /* 0x34 Auxiliary Slave Mode Snapshot High */
> + u32 AMMSLo; /* 0x38 Auxiliary Master Mode Snapshot Low */
> + u32 AMMSHi; /* 0x3C Auxiliary Master Mode Snapshot High */
> +
> + struct ixp46x_channel_ctl channel[3];
> +};
> +
> +/* 0x40 Time Synchronization Channel Control Register Bits */
> +#define MASTER_MODE (1<<0)
> +#define TIMESTAMP_ALL (1<<1)
> +
> +/* 0x44 Time Synchronization Channel Event Register Bits */
> +#define TX_SNAPSHOT_LOCKED (1<<0)
> +#define RX_SNAPSHOT_LOCKED (1<<1)
> +
> +#endif
> diff --git a/drivers/net/arm/ixp4xx_eth.c b/drivers/net/arm/ixp4xx_eth.c
> index 4f1cc71..2201960 100644
> --- a/drivers/net/arm/ixp4xx_eth.c
> +++ b/drivers/net/arm/ixp4xx_eth.c
> @@ -30,9 +30,12 @@
> #include <linux/etherdevice.h>
> #include <linux/io.h>
> #include <linux/kernel.h>
> +#include <linux/net_tstamp.h>
> #include <linux/phy.h>
> #include <linux/platform_device.h>
> +#include <linux/ptp_classify.h>
> #include <linux/slab.h>
> +#include <mach/ixp46x_ts.h>
> #include <mach/npe.h>
> #include <mach/qmgr.h>
>
> @@ -67,6 +70,14 @@
> #define RXFREE_QUEUE(port_id) (NPE_ID(port_id) + 26)
> #define TXDONE_QUEUE 31
>
> +#define PTP_SLAVE_MODE 1
> +#define PTP_MASTER_MODE 2
> +#define PORT2CHANNEL(p) 1
> +/*
> + * PHYSICAL_ID(p->id) ?
> + * TODO - Figure out correct mapping.
> + */
> +
> /* TX Control Registers */
> #define TX_CNTRL0_TX_EN 0x01
> #define TX_CNTRL0_HALFDUPLEX 0x02
> @@ -171,6 +182,8 @@ struct port {
> int id; /* logical port ID */
> int speed, duplex;
> u8 firmware[4];
> + int hwts_tx_en;
> + int hwts_rx_en;
> };
>
> /* NPE message structure */
> @@ -246,6 +259,170 @@ static int ports_open;
> static struct port *npe_port_tab[MAX_NPES];
> static struct dma_pool *dma_pool;
>
> +static struct sock_filter ptp_filter[] = {
> + PTP_FILTER
> +};
> +
> +static int match(struct sk_buff *skb, u16 uid_hi, u32 uid_lo, u16 seq)
> +{
> + unsigned int type;
> + u16 *hi, *id;
> + u8 *lo, *data = skb->data;
> +
> + type = sk_run_filter(skb, ptp_filter, ARRAY_SIZE(ptp_filter));
> +
> + if (PTP_CLASS_V1_IPV4 == type) {
> +
> + id = (u16 *)(data + 42 + 30);
> + hi = (u16 *)(data + 42 + 22);
> + lo = data + 42 + 24;
> +
> + return (uid_hi == *hi &&
> + 0 == memcmp(&uid_lo, lo, sizeof(uid_lo)) &&
> + seq == *id);
> + }
> +
> + return 0;
> +}
> +
> +static void do_rx_timestamp(struct port *port, struct sk_buff *skb)
> +{
> + struct skb_shared_hwtstamps *shhwtstamps;
> + struct ixp46x_ts_regs *regs;
> + u64 ns;
> + u32 ch, hi, lo, val;
> + u16 uid, seq;
> +
> + if (!port->hwts_rx_en)
> + return;
> +
> + ch = PORT2CHANNEL(port);
> +
> + regs = (struct ixp46x_ts_regs __iomem *) IXP4XX_TIMESYNC_BASE_VIRT;
> +
> + val = __raw_readl(®s->channel[ch].Ch_Event);
> +
> + if (!(val & RX_SNAPSHOT_LOCKED))
> + return;
> +
> + lo = __raw_readl(®s->channel[ch].SrcUUIDLo);
> + hi = __raw_readl(®s->channel[ch].SrcUUIDHi);
> +
> + uid = hi & 0xffff;
> + seq = (hi >> 16) & 0xffff;
> +
> + if (!match(skb, htons(uid), htonl(lo), htons(seq)))
> + goto out;
> +
> + lo = __raw_readl(®s->channel[ch].RxSnapLo);
> + hi = __raw_readl(®s->channel[ch].RxSnapHi);
> + ns = ((u64) hi) << 32;
> + ns |= lo;
> + ns <<= TICKS_NS_SHIFT;
> +
> + shhwtstamps = skb_hwtstamps(skb);
> + memset(shhwtstamps, 0, sizeof(*shhwtstamps));
> + shhwtstamps->hwtstamp = ns_to_ktime(ns);
> +out:
> + __raw_writel(RX_SNAPSHOT_LOCKED, ®s->channel[ch].Ch_Event);
> +}
> +
> +static void do_tx_timestamp(struct port *port, struct sk_buff *skb)
> +{
> +#ifdef __ARMEB__
> + struct skb_shared_hwtstamps shhwtstamps;
> + struct ixp46x_ts_regs *regs;
> + union skb_shared_tx *shtx;
> + u64 ns;
> + u32 ch, cnt, hi, lo, val;
> +
> + shtx = skb_tx(skb);
> +
> + if (!shtx->in_progress)
> + return;
> +
> + ch = PORT2CHANNEL(port);
> +
> + regs = (struct ixp46x_ts_regs __iomem *) IXP4XX_TIMESYNC_BASE_VIRT;
> +
> + /*
> + * This really stinks, but we have to poll for the Tx time stamp.
> + * Usually, the time stamp is ready after 4 to 6 microseconds.
> + */
> + for (cnt = 0; cnt < 100; cnt++) {
> + val = __raw_readl(®s->channel[ch].Ch_Event);
> + if (val & TX_SNAPSHOT_LOCKED)
> + break;
> + udelay(1);
You want to get stuff as fast as possible, but there is a udelay()
that just chews up CPU time. Would cpu_relax() be sufficient with a
time-based exit condition in the loop?
> + }
> + if (!(val & TX_SNAPSHOT_LOCKED)) {
> + shtx->in_progress = 0;
> + return;
> + }
> +
> + lo = __raw_readl(®s->channel[ch].TxSnapLo);
> + hi = __raw_readl(®s->channel[ch].TxSnapHi);
> + ns = ((u64) hi) << 32;
> + ns |= lo;
> + ns <<= TICKS_NS_SHIFT;
> +
> + memset(&shhwtstamps, 0, sizeof(shhwtstamps));
> + shhwtstamps.hwtstamp = ns_to_ktime(ns);
> + skb_tstamp_tx(skb, &shhwtstamps);
> +
> + __raw_writel(TX_SNAPSHOT_LOCKED, ®s->channel[ch].Ch_Event);
> +#endif
> +}
> +
> +static int hwtstamp_ioctl(struct net_device *netdev, struct ifreq *ifr, int
> cmd)
> +{
> + struct hwtstamp_config cfg;
> + struct ixp46x_ts_regs *regs;
> + struct port *port = netdev_priv(netdev);
> + int ch;
> +
> + if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
> + return -EFAULT;
> +
> + if (cfg.flags) /* reserved for future extensions */
> + return -EINVAL;
> +
> + ch = PORT2CHANNEL(port);
> + regs = (struct ixp46x_ts_regs __iomem *) IXP4XX_TIMESYNC_BASE_VIRT;
> +
> + switch (cfg.tx_type) {
> + case HWTSTAMP_TX_OFF:
> + port->hwts_tx_en = 0;
> + break;
> + case HWTSTAMP_TX_ON:
> + port->hwts_tx_en = 1;
> + break;
> + default:
> + return -ERANGE;
> + }
> +
> + switch (cfg.rx_filter) {
> + case HWTSTAMP_FILTER_NONE:
> + port->hwts_rx_en = 0;
> + break;
> + case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
> + port->hwts_rx_en = PTP_SLAVE_MODE;
> + __raw_writel(0, ®s->channel[ch].Ch_Control);
> + break;
> + case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
> + port->hwts_rx_en = PTP_MASTER_MODE;
> + __raw_writel(MASTER_MODE, ®s->channel[ch].Ch_Control);
> + break;
> + default:
> + return -ERANGE;
> + }
> +
> + /* Clear out any old time stamps. */
> + __raw_writel(TX_SNAPSHOT_LOCKED | RX_SNAPSHOT_LOCKED,
> + ®s->channel[ch].Ch_Event);
> +
> + return copy_to_user(ifr->ifr_data, &cfg, sizeof(cfg)) ? -EFAULT : 0;
> +}
>
> static int ixp4xx_mdio_cmd(struct mii_bus *bus, int phy_id, int location,
> int write, u16 cmd)
> @@ -573,6 +750,7 @@ static int eth_poll(struct napi_struct *napi, int budget)
>
> debug_pkt(dev, "eth_poll", skb->data, skb->len);
>
> + do_rx_timestamp(port, skb);
> skb->protocol = eth_type_trans(skb, dev);
> dev->stats.rx_packets++;
> dev->stats.rx_bytes += skb->len;
> @@ -652,6 +830,7 @@ static int eth_xmit(struct sk_buff *skb, struct
> net_device *dev)
> void *mem;
> u32 phys;
> struct desc *desc;
> + union skb_shared_tx *shtx;
>
> #if DEBUG_TX
> printk(KERN_DEBUG "%s: eth_xmit\n", dev->name);
> @@ -665,6 +844,10 @@ static int eth_xmit(struct sk_buff *skb, struct
> net_device *dev)
>
> debug_pkt(dev, "eth_xmit", skb->data, skb->len);
>
> + shtx = skb_tx(skb);
> + if (unlikely(shtx->hardware && port->hwts_tx_en))
> + shtx->in_progress = 1;
> +
> len = skb->len;
> #ifdef __ARMEB__
> offset = 0; /* no need to keep alignment */
> @@ -728,6 +911,9 @@ static int eth_xmit(struct sk_buff *skb, struct
> net_device *dev)
> #if DEBUG_TX
> printk(KERN_DEBUG "%s: eth_xmit end\n", dev->name);
> #endif
> +
> + do_tx_timestamp(port, skb);
> +
> return NETDEV_TX_OK;
> }
>
> @@ -783,6 +969,9 @@ static int eth_ioctl(struct net_device *dev, struct ifreq
> *req, int cmd)
> if (!netif_running(dev))
> return -EINVAL;
>
> + if (cpu_is_ixp46x() && cmd == SIOCSHWTSTAMP)
> + return hwtstamp_ioctl(dev, req, cmd);
> +
> return phy_mii_ioctl(port->phydev, req, cmd);
> }
>
> @@ -1171,6 +1360,11 @@ static int __devinit eth_init_one(struct
> platform_device *pdev)
> char phy_id[MII_BUS_ID_SIZE + 3];
> int err;
>
> + if (sk_chk_filter(ptp_filter, ARRAY_SIZE(ptp_filter))) {
> + pr_err("ixp4xx_eth: bad ptp filter\n");
> + return -EINVAL;
> + }
> +
> if (!(dev = alloc_etherdev(sizeof(struct port))))
> return -ENOMEM;
>
> diff --git a/drivers/ptp/Kconfig b/drivers/ptp/Kconfig
> index 3b7bd73..9fb35f6 100644
> --- a/drivers/ptp/Kconfig
> +++ b/drivers/ptp/Kconfig
> @@ -48,4 +48,17 @@ config PTP_1588_CLOCK_GIANFAR
> To compile this driver as a module, choose M here: the module
> will be called gianfar_ptp.
>
> +config PTP_1588_CLOCK_IXP46X
> + tristate "Intel IXP46x as PTP clock"
> + depends on PTP_1588_CLOCK
> + depends on IXP4XX_ETH
> + help
> + This driver adds support for using the IXP46X 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.
> +
> + To compile this driver as a module, choose M here: the module
> + will be called ptp_ixp46x.
> +
> endmenu
> diff --git a/drivers/ptp/Makefile b/drivers/ptp/Makefile
> index 1651d52..5018f58 100644
> --- a/drivers/ptp/Makefile
> +++ b/drivers/ptp/Makefile
> @@ -4,3 +4,4 @@
>
> obj-$(CONFIG_PTP_1588_CLOCK) += ptp_clock.o
> obj-$(CONFIG_PTP_1588_CLOCK_LINUX) += ptp_linux.o
> +obj-$(CONFIG_PTP_1588_CLOCK_IXP46X) += ptp_ixp46x.o
> diff --git a/drivers/ptp/ptp_ixp46x.c b/drivers/ptp/ptp_ixp46x.c
> new file mode 100644
> index 0000000..22c5bc3
> --- /dev/null
> +++ b/drivers/ptp/ptp_ixp46x.c
> @@ -0,0 +1,231 @@
> +/*
> + * PTP 1588 clock using the IXP46X
> + *
> + * 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.
> + */
> +#include <linux/device.h>
> +#include <linux/err.h>
> +#include <linux/init.h>
> +#include <linux/io.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +
> +#include <linux/ptp_clock_kernel.h>
> +#include <mach/ixp46x_ts.h>
> +
> +DEFINE_SPINLOCK(register_lock);
> +
> +/*
> + * Register access functions
> + */
> +
> +static inline u32 ixp_read(volatile unsigned __iomem *addr)
> +{
> + u32 val;
> + val = __raw_readl(addr);
> + return val;
> +}
return __raw_readl(addr) perhaps?
> +
> +static inline void ixp_write(volatile unsigned __iomem *addr, u32 val)
> +{
> + __raw_writel(val, addr);
> +}
> +
> +static u64 sys_time_read(struct ixp46x_ts_regs *regs)
> +{
> + u64 ns;
> + u32 lo, hi;
> +
> + lo = ixp_read(®s->SysTimeLo);
> + hi = ixp_read(®s->SysTimeHi);
> +
> + ns = ((u64) hi) << 32;
> + ns |= lo;
> + ns <<= TICKS_NS_SHIFT;
> +
> + return ns;
> +}
> +
> +static void sys_time_write(struct ixp46x_ts_regs *regs, u64 ns)
Should use the ptp_ixp_ prefix on these functions too.
> +{
> + u32 hi, lo;
> +
> + ns >>= TICKS_NS_SHIFT;
> + hi = ns >> 32;
> + lo = ns & 0xffffffff;
> +
> + ixp_write(®s->SysTimeLo, lo);
> + ixp_write(®s->SysTimeHi, hi);
> +}
> +
> +/*
> + * PTP clock operations
> + */
> +
> +static int ptp_ixp_adjfreq(void *priv, s32 ppb)
> +{
> + u64 adj;
> + u32 diff, addend;
> + int neg_adj = 0;
> + struct ixp46x_ts_regs *regs = priv;
> +
> + if (!ppb)
> + return 0;
> +
> + if (ppb < 0) {
> + neg_adj = 1;
> + ppb = -ppb;
> + }
> + addend = DEFAULT_ADDEND;
> + adj = addend;
> + adj *= ppb;
> + diff = div_u64(adj, 1000000000ULL);
> +
> + addend = neg_adj ? addend - diff : addend + diff;
> +
> + ixp_write(®s->Addend, addend);
> +
> + return 0;
> +}
> +
> +static int ptp_ixp_adjtime(void *priv, struct timespec *ts)
> +{
> + s64 delta, now;
> + unsigned long flags;
> + struct ixp46x_ts_regs *regs = priv;
> +
> + delta = 1000000000LL * ts->tv_sec;
> + delta += ts->tv_nsec;
> +
> + spin_lock_irqsave(®ister_lock, flags);
> +
> + now = sys_time_read(regs);
> + now += delta;
> + sys_time_write(regs, now);
> +
> + spin_unlock_irqrestore(®ister_lock, flags);
> +
> + return 0;
> +}
> +
> +static int ptp_ixp_gettime(void *priv, struct timespec *ts)
> +{
> + u64 ns;
> + u32 remainder;
> + unsigned long flags;
> + struct ixp46x_ts_regs *regs = priv;
> +
> + spin_lock_irqsave(®ister_lock, flags);
> +
> + ns = sys_time_read(regs);
> +
> + spin_unlock_irqrestore(®ister_lock, flags);
> +
> + ts->tv_sec = div_u64_rem(ns, 1000000000, &remainder);
> + ts->tv_nsec = remainder;
> + return 0;
> +}
> +
> +static int ptp_ixp_settime(void *priv, struct timespec *ts)
> +{
> + u64 ns;
> + unsigned long flags;
> + struct ixp46x_ts_regs *regs = priv;
> +
> + ns = ts->tv_sec * 1000000000ULL;
> + ns += ts->tv_nsec;
> +
> + spin_lock_irqsave(®ister_lock, flags);
> +
> + sys_time_write(regs, ns);
> +
> + spin_unlock_irqrestore(®ister_lock, flags);
> +
> + return 0;
> +}
> +
> +static int ptp_ixp_gettimer(void *priv, int index, struct itimerspec *ts)
> +{
> + /* We do not offer any ancillary features at all. */
> + return -EOPNOTSUPP;
> +}
> +
> +static int ptp_ixp_settimer(void *p, int i, int abs, struct itimerspec *ts)
> +{
> + /* We do not offer any ancillary features at all. */
> + return -EOPNOTSUPP;
> +}
> +
> +static int ptp_ixp_enable(void *priv, struct ptp_clock_request *rq, int on)
> +{
> + /* We do not offer any ancillary features at all. */
> + return -EOPNOTSUPP;
> +}
> +
> +static struct ptp_clock_info ptp_ixp_caps = {
> + .owner = THIS_MODULE,
> + .name = "IXP46X timer",
> + .max_adj = 512000,
> + .n_alarm = 0,
> + .n_ext_ts = 0,
> + .n_per_out = 0,
> + .pps = 0,
> + .priv = NULL,
If the value is '0' or NULL, just leave them out of the structure initializer.
> + .adjfreq = ptp_ixp_adjfreq,
> + .adjtime = ptp_ixp_adjtime,
> + .gettime = ptp_ixp_gettime,
> + .settime = ptp_ixp_settime,
> + .gettimer = ptp_ixp_gettimer,
> + .settimer = ptp_ixp_settimer,
> + .enable = ptp_ixp_enable,
> +};
> +
> +/* module operations */
> +
> +static struct {
> + struct ixp46x_ts_regs *regs;
> + struct ptp_clock *ptp_clock;
> +} ixp_clock;
> +
> +static void __exit ptp_ixp_exit(void)
> +{
> + ptp_clock_unregister(ixp_clock.ptp_clock);
> +}
> +
> +static int __init ptp_ixp_init(void)
> +{
> + ixp_clock.regs =
> + (struct ixp46x_ts_regs __iomem *)IXP4XX_TIMESYNC_BASE_VIRT;
> +
> + ptp_ixp_caps.priv = ixp_clock.regs;
> +
> + ixp_clock.ptp_clock = ptp_clock_register(&ptp_ixp_caps);
> +
> + if (IS_ERR(ixp_clock.ptp_clock))
> + return PTR_ERR(ixp_clock.ptp_clock);
> +
> + ixp_write(&ixp_clock.regs->Addend, DEFAULT_ADDEND);
> +
> + return 0;
> +}
> +
> +module_init(ptp_ixp_init);
> +module_exit(ptp_ixp_exit);
Keep module_init and module_exit with their respective function declarations.
g.
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