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Message-Id: <1273505954-32588-1-git-send-email-vapier@gentoo.org>
Date: Mon, 10 May 2010 11:39:06 -0400
From: Mike Frysinger <vapier@...too.org>
To: netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>
Cc: uclinux-dist-devel@...ckfin.uclinux.org,
Barry Song <barry.song@...log.com>
Subject: [PATCH 1/9] netdev: bfin_mac: add support for IEEE 1588 PTP
From: Barry Song <barry.song@...log.com>
Newer on-chip MAC peripherals support IEEE 1588 PTP in the hardware, so
extend the driver to support this functionality.
Signed-off-by: Barry Song <barry.song@...log.com>
Signed-off-by: Mike Frysinger <vapier@...too.org>
---
drivers/net/Kconfig | 7 +
drivers/net/bfin_mac.c | 341 +++++++++++++++++++++++++++++++++++++++++++++++-
drivers/net/bfin_mac.h | 15 ++
3 files changed, 362 insertions(+), 1 deletions(-)
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index 7b832c7..ac536b9 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -887,6 +887,13 @@ config BFIN_MAC_RMII
help
Use Reduced PHY MII Interface
+config BFIN_MAC_USE_HWSTAMP
+ bool "Use IEEE 1588 hwstamp"
+ depends on BFIN_MAC && BF518
+ default y
+ help
+ To support the IEEE 1588 Precision Time Protocol (PTP), select y here
+
config SMC9194
tristate "SMC 9194 support"
depends on NET_VENDOR_SMC && (ISA || MAC && BROKEN)
diff --git a/drivers/net/bfin_mac.c b/drivers/net/bfin_mac.c
index 587f93c..6a9519f 100644
--- a/drivers/net/bfin_mac.c
+++ b/drivers/net/bfin_mac.c
@@ -33,6 +33,7 @@
#include <asm/dma.h>
#include <linux/dma-mapping.h>
+#include <asm/div64.h>
#include <asm/dpmc.h>
#include <asm/blackfin.h>
#include <asm/cacheflush.h>
@@ -551,6 +552,309 @@ static int bfin_mac_set_mac_address(struct net_device *dev, void *p)
return 0;
}
+#ifdef CONFIG_BFIN_MAC_USE_HWSTAMP
+#define bfin_mac_hwtstamp_is_none(cfg) ((cfg) == HWTSTAMP_FILTER_NONE)
+
+static int bfin_mac_hwtstamp_ioctl(struct net_device *netdev,
+ struct ifreq *ifr, int cmd)
+{
+ struct hwtstamp_config config;
+ struct bfin_mac_local *lp = netdev_priv(netdev);
+ u16 ptpctl;
+ u32 ptpfv1, ptpfv2, ptpfv3, ptpfoff;
+
+ if (copy_from_user(&config, ifr->ifr_data, sizeof(config)))
+ return -EFAULT;
+
+ pr_debug("%s config flag:0x%x, tx_type:0x%x, rx_filter:0x%x\n",
+ __func__, config.flags, config.tx_type, config.rx_filter);
+
+ /* reserved for future extensions */
+ if (config.flags)
+ return -EINVAL;
+
+ if ((config.tx_type != HWTSTAMP_TX_OFF) &&
+ (config.tx_type != HWTSTAMP_TX_ON))
+ return -ERANGE;
+
+ ptpctl = bfin_read_EMAC_PTP_CTL();
+
+ switch (config.rx_filter) {
+ case HWTSTAMP_FILTER_NONE:
+ /*
+ * Dont allow any timestamping
+ */
+ ptpfv3 = 0xFFFFFFFF;
+ bfin_write_EMAC_PTP_FV3(ptpfv3);
+ break;
+ case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
+ case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
+ case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
+ /*
+ * Clear the five comparison mask bits (bits[12:8]) in EMAC_PTP_CTL)
+ * to enable all the field matches.
+ */
+ ptpctl &= ~0x1F00;
+ bfin_write_EMAC_PTP_CTL(ptpctl);
+ /*
+ * Keep the default values of the EMAC_PTP_FOFF register.
+ */
+ ptpfoff = 0x4A24170C;
+ bfin_write_EMAC_PTP_FOFF(ptpfoff);
+ /*
+ * Keep the default values of the EMAC_PTP_FV1 and EMAC_PTP_FV2
+ * registers.
+ */
+ ptpfv1 = 0x11040800;
+ bfin_write_EMAC_PTP_FV1(ptpfv1);
+ ptpfv2 = 0x0140013F;
+ bfin_write_EMAC_PTP_FV2(ptpfv2);
+ /*
+ * The default value (0xFFFC) allows the timestamping of both
+ * received Sync messages and Delay_Req messages.
+ */
+ ptpfv3 = 0xFFFFFFFC;
+ bfin_write_EMAC_PTP_FV3(ptpfv3);
+
+ config.rx_filter = HWTSTAMP_FILTER_PTP_V1_L4_EVENT;
+ break;
+ case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
+ case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
+ case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
+ /* Clear all five comparison mask bits (bits[12:8]) in the
+ * EMAC_PTP_CTL register to enable all the field matches.
+ */
+ ptpctl &= ~0x1F00;
+ bfin_write_EMAC_PTP_CTL(ptpctl);
+ /*
+ * Keep the default values of the EMAC_PTP_FOFF register, except set
+ * the PTPCOF field to 0x2A.
+ */
+ ptpfoff = 0x2A24170C;
+ bfin_write_EMAC_PTP_FOFF(ptpfoff);
+ /*
+ * Keep the default values of the EMAC_PTP_FV1 and EMAC_PTP_FV2
+ * registers.
+ */
+ ptpfv1 = 0x11040800;
+ bfin_write_EMAC_PTP_FV1(ptpfv1);
+ ptpfv2 = 0x0140013F;
+ bfin_write_EMAC_PTP_FV2(ptpfv2);
+ /*
+ * To allow the timestamping of Pdelay_Req and Pdelay_Resp, set
+ * the value to 0xFFF0.
+ */
+ ptpfv3 = 0xFFFFFFF0;
+ bfin_write_EMAC_PTP_FV3(ptpfv3);
+
+ config.rx_filter = HWTSTAMP_FILTER_PTP_V2_L4_EVENT;
+ break;
+ case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
+ case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
+ case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
+ /*
+ * Clear bits 8 and 12 of the EMAC_PTP_CTL register to enable only the
+ * EFTM and PTPCM field comparison.
+ */
+ ptpctl &= ~0x1100;
+ bfin_write_EMAC_PTP_CTL(ptpctl);
+ /*
+ * Keep the default values of all the fields of the EMAC_PTP_FOFF
+ * register, except set the PTPCOF field to 0x0E.
+ */
+ ptpfoff = 0x0E24170C;
+ bfin_write_EMAC_PTP_FOFF(ptpfoff);
+ /*
+ * Program bits [15:0] of the EMAC_PTP_FV1 register to 0x88F7, which
+ * corresponds to PTP messages on the MAC layer.
+ */
+ ptpfv1 = 0x110488F7;
+ bfin_write_EMAC_PTP_FV1(ptpfv1);
+ ptpfv2 = 0x0140013F;
+ bfin_write_EMAC_PTP_FV2(ptpfv2);
+ /*
+ * To allow the timestamping of Pdelay_Req and Pdelay_Resp
+ * messages, set the value to 0xFFF0.
+ */
+ ptpfv3 = 0xFFFFFFF0;
+ bfin_write_EMAC_PTP_FV3(ptpfv3);
+
+ config.rx_filter = HWTSTAMP_FILTER_PTP_V2_L2_EVENT;
+ break;
+ default:
+ return -ERANGE;
+ }
+
+ if (config.tx_type == HWTSTAMP_TX_OFF &&
+ bfin_mac_hwtstamp_is_none(config.rx_filter)) {
+ ptpctl &= ~PTP_EN;
+ bfin_write_EMAC_PTP_CTL(ptpctl);
+
+ SSYNC();
+ } else {
+ ptpctl |= PTP_EN;
+ bfin_write_EMAC_PTP_CTL(ptpctl);
+
+ /*
+ * clear any existing timestamp
+ */
+ bfin_read_EMAC_PTP_RXSNAPLO();
+ bfin_read_EMAC_PTP_RXSNAPHI();
+
+ bfin_read_EMAC_PTP_TXSNAPLO();
+ bfin_read_EMAC_PTP_TXSNAPHI();
+
+ /*
+ * Set registers so that rollover occurs soon to test this.
+ */
+ bfin_write_EMAC_PTP_TIMELO(0x00000000);
+ bfin_write_EMAC_PTP_TIMEHI(0xFF800000);
+
+ SSYNC();
+
+ lp->compare.last_update = 0;
+ timecounter_init(&lp->clock,
+ &lp->cycles,
+ ktime_to_ns(ktime_get_real()));
+ timecompare_update(&lp->compare, 0);
+ }
+
+ lp->stamp_cfg = config;
+ return copy_to_user(ifr->ifr_data, &config, sizeof(config)) ?
+ -EFAULT : 0;
+}
+
+static void bfin_dump_hwtamp(char *s, ktime_t *hw, ktime_t *ts, struct timecompare *cmp)
+{
+ ktime_t sys = ktime_get_real();
+
+ pr_debug("%s %s hardware:%d,%d transform system:%d,%d system:%d,%d, cmp:%lld, %lld\n",
+ __func__, s, hw->tv.sec, hw->tv.nsec, ts->tv.sec, ts->tv.nsec, sys.tv.sec,
+ sys.tv.nsec, cmp->offset, cmp->skew);
+}
+
+static void bfin_tx_hwtstamp(struct net_device *netdev, struct sk_buff *skb)
+{
+ struct bfin_mac_local *lp = netdev_priv(netdev);
+ union skb_shared_tx *shtx = skb_tx(skb);
+
+ if (shtx->hardware) {
+ int timeout_cnt = MAX_TIMEOUT_CNT;
+
+ /* When doing time stamping, keep the connection to the socket
+ * a while longer
+ */
+ shtx->in_progress = 1;
+
+ /*
+ * The timestamping is done at the EMAC module's MII/RMII interface
+ * when the module sees the Start of Frame of an event message packet. This
+ * interface is the closest possible place to the physical Ethernet transmission
+ * medium, providing the best timing accuracy.
+ */
+ while ((!(bfin_read_EMAC_PTP_ISTAT() & TXTL)) && (--timeout_cnt))
+ udelay(1);
+ if (timeout_cnt == 0)
+ printk(KERN_ERR DRV_NAME
+ ": fails to timestamp the TX packet\n");
+ else {
+ struct skb_shared_hwtstamps shhwtstamps;
+ u64 ns;
+ u64 regval;
+
+ regval = bfin_read_EMAC_PTP_TXSNAPLO();
+ regval |= (u64)bfin_read_EMAC_PTP_TXSNAPHI() << 32;
+ memset(&shhwtstamps, 0, sizeof(shhwtstamps));
+ ns = timecounter_cyc2time(&lp->clock,
+ regval);
+ timecompare_update(&lp->compare, ns);
+ shhwtstamps.hwtstamp = ns_to_ktime(ns);
+ shhwtstamps.syststamp =
+ timecompare_transform(&lp->compare, ns);
+ skb_tstamp_tx(skb, &shhwtstamps);
+
+ bfin_dump_hwtamp("TX", &shhwtstamps.hwtstamp, &shhwtstamps.syststamp, &lp->compare);
+ }
+ }
+}
+
+static void bfin_rx_hwtstamp(struct net_device *netdev, struct sk_buff *skb)
+{
+ struct bfin_mac_local *lp = netdev_priv(netdev);
+ u32 valid;
+ u64 regval, ns;
+ struct skb_shared_hwtstamps *shhwtstamps;
+
+ if (bfin_mac_hwtstamp_is_none(lp->stamp_cfg.rx_filter))
+ return;
+
+ valid = bfin_read_EMAC_PTP_ISTAT() & RXEL;
+ if (!valid)
+ return;
+
+ shhwtstamps = skb_hwtstamps(skb);
+
+ regval = bfin_read_EMAC_PTP_RXSNAPLO();
+ regval |= (u64)bfin_read_EMAC_PTP_RXSNAPHI() << 32;
+ ns = timecounter_cyc2time(&lp->clock, regval);
+ timecompare_update(&lp->compare, ns);
+ memset(shhwtstamps, 0, sizeof(*shhwtstamps));
+ shhwtstamps->hwtstamp = ns_to_ktime(ns);
+ shhwtstamps->syststamp = timecompare_transform(&lp->compare, ns);
+
+ bfin_dump_hwtamp("RX", &shhwtstamps->hwtstamp, &shhwtstamps->syststamp, &lp->compare);
+}
+
+/*
+ * bfin_read_clock - read raw cycle counter (to be used by time counter)
+ */
+static cycle_t bfin_read_clock(const struct cyclecounter *tc)
+{
+ u64 stamp;
+
+ stamp = bfin_read_EMAC_PTP_TIMELO();
+ stamp |= (u64)bfin_read_EMAC_PTP_TIMEHI() << 32ULL;
+
+ return stamp;
+}
+
+#define PTP_CLK 25000000
+
+static void bfin_mac_hwtstamp_init(struct net_device *netdev)
+{
+ struct bfin_mac_local *lp = netdev_priv(netdev);
+ u64 append;
+
+ /* Initialize hardware timer */
+ append = PTP_CLK * (1ULL << 32);
+ do_div(append, get_sclk());
+ bfin_write_EMAC_PTP_ADDEND((u32)append);
+
+ memset(&lp->cycles, 0, sizeof(lp->cycles));
+ lp->cycles.read = bfin_read_clock;
+ lp->cycles.mask = CLOCKSOURCE_MASK(64);
+ lp->cycles.mult = 1000000000 / PTP_CLK;
+ lp->cycles.shift = 0;
+
+ /* Synchronize our NIC clock against system wall clock */
+ memset(&lp->compare, 0, sizeof(lp->compare));
+ lp->compare.source = &lp->clock;
+ lp->compare.target = ktime_get_real;
+ lp->compare.num_samples = 10;
+
+ /* Initialize hwstamp config */
+ lp->stamp_cfg.rx_filter = HWTSTAMP_FILTER_NONE;
+ lp->stamp_cfg.tx_type = HWTSTAMP_TX_OFF;
+}
+
+#else
+# define bfin_mac_hwtstamp_is_none(cfg) 0
+# define bfin_mac_hwtstamp_init(dev)
+# define bfin_mac_hwtstamp_ioctl(dev, ifr, cmd) (-EOPNOTSUPP)
+# define bfin_rx_hwtstamp(dev, skb)
+# define bfin_tx_hwtstamp(dev, skb)
+#endif
+
static void adjust_tx_list(void)
{
int timeout_cnt = MAX_TIMEOUT_CNT;
@@ -608,18 +912,32 @@ static int bfin_mac_hard_start_xmit(struct sk_buff *skb,
{
u16 *data;
u32 data_align = (unsigned long)(skb->data) & 0x3;
+ union skb_shared_tx *shtx = skb_tx(skb);
+
current_tx_ptr->skb = skb;
if (data_align == 0x2) {
/* move skb->data to current_tx_ptr payload */
data = (u16 *)(skb->data) - 1;
- *data = (u16)(skb->len);
+ *data = (u16)(skb->len);
+ /*
+ * When transmitting an Ethernet packet, the PTP_TSYNC module requires
+ * a DMA_Length_Word field associated with the packet. The lower 12 bits
+ * of this field are the length of the packet payload in bytes and the higher
+ * 4 bits are the timestamping enable field.
+ */
+ if (shtx->hardware)
+ *data |= 0x1000;
+
current_tx_ptr->desc_a.start_addr = (u32)data;
/* this is important! */
blackfin_dcache_flush_range((u32)data,
(u32)((u8 *)data + skb->len + 4));
} else {
*((u16 *)(current_tx_ptr->packet)) = (u16)(skb->len);
+ /* enable timestamping for the sent packet */
+ if (shtx->hardware)
+ *((u16 *)(current_tx_ptr->packet)) |= 0x1000;
memcpy((u8 *)(current_tx_ptr->packet + 2), skb->data,
skb->len);
current_tx_ptr->desc_a.start_addr =
@@ -653,6 +971,9 @@ static int bfin_mac_hard_start_xmit(struct sk_buff *skb,
out:
adjust_tx_list();
+
+ bfin_tx_hwtstamp(dev, skb);
+
current_tx_ptr = current_tx_ptr->next;
dev->trans_start = jiffies;
dev->stats.tx_packets++;
@@ -664,9 +985,11 @@ static void bfin_mac_rx(struct net_device *dev)
{
struct sk_buff *skb, *new_skb;
unsigned short len;
+ struct bfin_mac_local *lp __maybe_unused = netdev_priv(dev);
/* allocate a new skb for next time receive */
skb = current_rx_ptr->skb;
+
new_skb = dev_alloc_skb(PKT_BUF_SZ + NET_IP_ALIGN);
if (!new_skb) {
printk(KERN_NOTICE DRV_NAME
@@ -691,6 +1014,9 @@ static void bfin_mac_rx(struct net_device *dev)
(unsigned long)skb->tail);
skb->protocol = eth_type_trans(skb, dev);
+
+ bfin_rx_hwtstamp(dev, skb);
+
#if defined(BFIN_MAC_CSUM_OFFLOAD)
skb->csum = current_rx_ptr->status.ip_payload_csum;
skb->ip_summed = CHECKSUM_COMPLETE;
@@ -874,6 +1200,16 @@ static void bfin_mac_set_multicast_list(struct net_device *dev)
}
}
+static int bfin_mac_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
+{
+ switch (cmd) {
+ case SIOCSHWTSTAMP:
+ return bfin_mac_hwtstamp_ioctl(netdev, ifr, cmd);
+ default:
+ return -EOPNOTSUPP;
+ }
+}
+
/*
* this puts the device in an inactive state
*/
@@ -958,6 +1294,7 @@ static const struct net_device_ops bfin_mac_netdev_ops = {
.ndo_set_mac_address = bfin_mac_set_mac_address,
.ndo_tx_timeout = bfin_mac_timeout,
.ndo_set_multicast_list = bfin_mac_set_multicast_list,
+ .ndo_do_ioctl = bfin_mac_ioctl,
.ndo_validate_addr = eth_validate_addr,
.ndo_change_mtu = eth_change_mtu,
#ifdef CONFIG_NET_POLL_CONTROLLER
@@ -1049,6 +1386,8 @@ static int __devinit bfin_mac_probe(struct platform_device *pdev)
goto out_err_reg_ndev;
}
+ bfin_mac_hwtstamp_init(ndev);
+
/* now, print out the card info, in a short format.. */
dev_info(&pdev->dev, "%s, Version %s\n", DRV_DESC, DRV_VERSION);
diff --git a/drivers/net/bfin_mac.h b/drivers/net/bfin_mac.h
index 052b5dc..87c454f 100644
--- a/drivers/net/bfin_mac.h
+++ b/drivers/net/bfin_mac.h
@@ -7,6 +7,12 @@
*
* Licensed under the GPL-2 or later.
*/
+#ifndef _BFIN_MAC_H_
+#define _BFIN_MAC_H_
+
+#include <linux/net_tstamp.h>
+#include <linux/clocksource.h>
+#include <linux/timecompare.h>
#define BFIN_MAC_CSUM_OFFLOAD
@@ -67,6 +73,15 @@ struct bfin_mac_local {
struct phy_device *phydev;
struct mii_bus *mii_bus;
+
+#if defined(CONFIG_BFIN_MAC_USE_HWSTAMP)
+ struct cyclecounter cycles;
+ struct timecounter clock;
+ struct timecompare compare;
+ struct hwtstamp_config stamp_cfg;
+#endif
};
extern void bfin_get_ether_addr(char *addr);
+
+#endif
--
1.7.1
--
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