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Message-Id: <1345574712-21444-4-git-send-email-ddaney.cavm@gmail.com>
Date: Tue, 21 Aug 2012 11:45:07 -0700
From: David Daney <ddaney.cavm@...il.com>
To: linux-mips@...ux-mips.org, ralf@...ux-mips.org,
"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
Chad Reese <kreese@...iumnetworks.com>,
David Daney <david.daney@...ium.com>
Subject: [PATCH 3/8] netdev: octeon_mgmt: Add hardware timestamp support.
From: Chad Reese <kreese@...iumnetworks.com>
Octeon cn6XXX models have timestamp support on the mgmt ports, so hook
it up.
Signed-off-by: Chad Reese <kreese@...iumnetworks.com>
Signed-off-by: David Daney <david.daney@...ium.com>
---
drivers/net/ethernet/octeon/octeon_mgmt.c | 157 +++++++++++++++++++++++++++++-
1 file changed, 152 insertions(+), 5 deletions(-)
diff --git a/drivers/net/ethernet/octeon/octeon_mgmt.c b/drivers/net/ethernet/octeon/octeon_mgmt.c
index c4df1ab..687a6a0 100644
--- a/drivers/net/ethernet/octeon/octeon_mgmt.c
+++ b/drivers/net/ethernet/octeon/octeon_mgmt.c
@@ -10,6 +10,7 @@
#include <linux/dma-mapping.h>
#include <linux/etherdevice.h>
#include <linux/capability.h>
+#include <linux/net_tstamp.h>
#include <linux/interrupt.h>
#include <linux/netdevice.h>
#include <linux/spinlock.h>
@@ -114,6 +115,7 @@ struct octeon_mgmt {
u64 agl_prt_ctl;
int port;
int irq;
+ bool has_rx_tstamp;
u64 *tx_ring;
dma_addr_t tx_ring_handle;
unsigned int tx_next;
@@ -238,6 +240,28 @@ static void octeon_mgmt_rx_fill_ring(struct net_device *netdev)
}
}
+static ktime_t ptp_to_ktime(u64 ptptime)
+{
+ ktime_t ktimebase;
+ u64 ptpbase;
+ unsigned long flags;
+
+ local_irq_save(flags);
+ /* Fill the icache with the code */
+ ktime_get_real();
+ /* Flush all pending operations */
+ mb();
+ /* Read the time and PTP clock as close together as
+ * possible. It is important that this sequence take the same
+ * amount of time to reduce jitter
+ */
+ ktimebase = ktime_get_real();
+ ptpbase = cvmx_read_csr(CVMX_MIO_PTP_CLOCK_HI);
+ local_irq_restore(flags);
+
+ return ktime_sub_ns(ktimebase, ptpbase - ptptime);
+}
+
static void octeon_mgmt_clean_tx_buffers(struct octeon_mgmt *p)
{
union cvmx_mixx_orcnt mix_orcnt;
@@ -277,6 +301,20 @@ static void octeon_mgmt_clean_tx_buffers(struct octeon_mgmt *p)
dma_unmap_single(p->dev, re.s.addr, re.s.len,
DMA_TO_DEVICE);
+
+ /* Read the hardware TX timestamp if one was recorded */
+ if (unlikely(re.s.tstamp)) {
+ struct skb_shared_hwtstamps ts;
+ /* Read the timestamp */
+ u64 ns = cvmx_read_csr(CVMX_MIXX_TSTAMP(p->port));
+ /* Remove the timestamp from the FIFO */
+ cvmx_write_csr(CVMX_MIXX_TSCTL(p->port), 0);
+ /* Tell the kernel about the timestamp */
+ ts.syststamp = ptp_to_ktime(ns);
+ ts.hwtstamp = ns_to_ktime(ns);
+ skb_tstamp_tx(skb, &ts);
+ }
+
dev_kfree_skb_any(skb);
cleaned++;
@@ -377,6 +415,16 @@ static int octeon_mgmt_receive_one(struct octeon_mgmt *p)
/* A good packet, send it up. */
skb_put(skb, re.s.len);
good:
+ /* Process the RX timestamp if it was recorded */
+ if (p->has_rx_tstamp) {
+ /* The first 8 bytes are the timestamp */
+ u64 ns = *(u64 *)skb->data;
+ struct skb_shared_hwtstamps *ts;
+ ts = skb_hwtstamps(skb);
+ ts->hwtstamp = ns_to_ktime(ns);
+ ts->syststamp = ptp_to_ktime(ns);
+ __skb_pull(skb, 8);
+ }
skb->protocol = eth_type_trans(skb, netdev);
netdev->stats.rx_packets++;
netdev->stats.rx_bytes += skb->len;
@@ -661,18 +709,114 @@ static irqreturn_t octeon_mgmt_interrupt(int cpl, void *dev_id)
return IRQ_HANDLED;
}
-static int octeon_mgmt_ioctl(struct net_device *netdev,
- struct ifreq *rq, int cmd)
+static int octeon_mgmt_ioctl_hwtstamp(struct net_device *netdev,
+ struct ifreq *rq, int cmd)
{
struct octeon_mgmt *p = netdev_priv(netdev);
+ struct hwtstamp_config config;
+ union cvmx_mio_ptp_clock_cfg ptp;
+ union cvmx_agl_gmx_rxx_frm_ctl rxx_frm_ctl;
+ bool have_hw_timestamps = false;
+
+ if (copy_from_user(&config, rq->ifr_data, sizeof(config)))
+ return -EFAULT;
- if (!netif_running(netdev))
+ if (config.flags) /* reserved for future extensions */
return -EINVAL;
- if (!p->phydev)
+ /* Check the status of hardware for tiemstamps */
+ if (OCTEON_IS_MODEL(OCTEON_CN6XXX)) {
+ /* Get the current state of the PTP clock */
+ ptp.u64 = cvmx_read_csr(CVMX_MIO_PTP_CLOCK_CFG);
+ if (!ptp.s.ext_clk_en) {
+ /* The clock has not been configured to use an
+ * external source. Program it to use the main clock
+ * reference.
+ */
+ u64 clock_comp = (NSEC_PER_SEC << 32) / octeon_get_io_clock_rate();
+ if (!ptp.s.ptp_en)
+ cvmx_write_csr(CVMX_MIO_PTP_CLOCK_COMP, clock_comp);
+ pr_info("PTP Clock: Using sclk reference at %lld Hz\n",
+ (NSEC_PER_SEC << 32) / clock_comp);
+ } else {
+ /* The clock is already programmed to use a GPIO */
+ u64 clock_comp = cvmx_read_csr(CVMX_MIO_PTP_CLOCK_COMP);
+ pr_info("PTP Clock: Using GPIO %d at %lld Hz\n",
+ ptp.s.ext_clk_in,
+ (NSEC_PER_SEC << 32) / clock_comp);
+ }
+
+ /* Enable the clock if it wasn't done already */
+ if (!ptp.s.ptp_en) {
+ ptp.s.ptp_en = 1;
+ cvmx_write_csr(CVMX_MIO_PTP_CLOCK_CFG, ptp.u64);
+ }
+ have_hw_timestamps = true;
+ }
+
+ if (!have_hw_timestamps)
return -EINVAL;
- return phy_mii_ioctl(p->phydev, rq, cmd);
+ switch (config.tx_type) {
+ case HWTSTAMP_TX_OFF:
+ case HWTSTAMP_TX_ON:
+ break;
+ default:
+ return -ERANGE;
+ }
+
+ switch (config.rx_filter) {
+ case HWTSTAMP_FILTER_NONE:
+ p->has_rx_tstamp = false;
+ rxx_frm_ctl.u64 = cvmx_read_csr(p->agl + AGL_GMX_RX_FRM_CTL);
+ rxx_frm_ctl.s.ptp_mode = 0;
+ cvmx_write_csr(p->agl + AGL_GMX_RX_FRM_CTL, rxx_frm_ctl.u64);
+ break;
+ case HWTSTAMP_FILTER_ALL:
+ case HWTSTAMP_FILTER_SOME:
+ case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
+ case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
+ case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
+ case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
+ case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
+ case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
+ case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
+ case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
+ case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
+ case HWTSTAMP_FILTER_PTP_V2_EVENT:
+ case HWTSTAMP_FILTER_PTP_V2_SYNC:
+ case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
+ p->has_rx_tstamp = have_hw_timestamps;
+ config.rx_filter = HWTSTAMP_FILTER_ALL;
+ if (p->has_rx_tstamp) {
+ rxx_frm_ctl.u64 = cvmx_read_csr(p->agl + AGL_GMX_RX_FRM_CTL);
+ rxx_frm_ctl.s.ptp_mode = 1;
+ cvmx_write_csr(p->agl + AGL_GMX_RX_FRM_CTL, rxx_frm_ctl.u64);
+ }
+ break;
+ default:
+ return -ERANGE;
+ }
+
+ if (copy_to_user(rq->ifr_data, &config, sizeof(config)))
+ return -EFAULT;
+
+ return 0;
+}
+
+static int octeon_mgmt_ioctl(struct net_device *netdev,
+ struct ifreq *rq, int cmd)
+{
+ struct octeon_mgmt *p = netdev_priv(netdev);
+
+ switch (cmd) {
+ case SIOCSHWTSTAMP:
+ return octeon_mgmt_ioctl_hwtstamp(netdev, rq, cmd);
+ default:
+ if (p->phydev)
+ return phy_mii_ioctl(p->phydev, rq, cmd);
+ return -EINVAL;
+ }
}
static void octeon_mgmt_disable_link(struct octeon_mgmt *p)
@@ -1052,6 +1196,7 @@ static int octeon_mgmt_open(struct net_device *netdev)
/* Enable packet I/O. */
rxx_frm_ctl.u64 = 0;
+ rxx_frm_ctl.s.ptp_mode = p->has_rx_tstamp ? 1 : 0;
rxx_frm_ctl.s.pre_align = 1;
/*
* When set, disables the length check for non-min sized pkts
@@ -1155,6 +1300,7 @@ static int octeon_mgmt_xmit(struct sk_buff *skb, struct net_device *netdev)
int rv = NETDEV_TX_BUSY;
re.d64 = 0;
+ re.s.tstamp = ((skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) != 0);
re.s.len = skb->len;
re.s.addr = dma_map_single(p->dev, skb->data,
skb->len,
@@ -1293,6 +1439,7 @@ static int __devinit octeon_mgmt_probe(struct platform_device *pdev)
p->netdev = netdev;
p->dev = &pdev->dev;
+ p->has_rx_tstamp = false;
data = of_get_property(pdev->dev.of_node, "cell-index", &len);
if (data && len == sizeof(*data)) {
--
1.7.11.4
--
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