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igb: access to NIC time 

Adds the register definitions and code to read the time
register.

Signed-off-by: John Ronciak <john.ronciak@intel.com>
Signed-off-by: Patrick Ohly <patrick.ohly@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick Ohly 2009-02-12 05:03:41 +00:00 committed by David S. Miller
parent d24fff22d8
commit 38c845c764
3 changed files with 143 additions and 0 deletions
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28
drivers/net/igb/e1000_regs.h
View File

@ -75,6 +75,34 @@
#define E1000_FCRTH 0x02168 /* Flow Control Receive Threshold High - RW */
#define E1000_RDFPCQ(_n) (0x02430 + (0x4 * (_n)))
#define E1000_FCRTV 0x02460 /* Flow Control Refresh Timer Value - RW */
/* IEEE 1588 TIMESYNCH */
#define E1000_TSYNCTXCTL 0x0B614
#define E1000_TSYNCRXCTL 0x0B620
#define E1000_TSYNCRXCFG 0x05F50
#define E1000_SYSTIML 0x0B600
#define E1000_SYSTIMH 0x0B604
#define E1000_TIMINCA 0x0B608
#define E1000_RXMTRL 0x0B634
#define E1000_RXSTMPL 0x0B624
#define E1000_RXSTMPH 0x0B628
#define E1000_RXSATRL 0x0B62C
#define E1000_RXSATRH 0x0B630
#define E1000_TXSTMPL 0x0B618
#define E1000_TXSTMPH 0x0B61C
#define E1000_ETQF0 0x05CB0
#define E1000_ETQF1 0x05CB4
#define E1000_ETQF2 0x05CB8
#define E1000_ETQF3 0x05CBC
#define E1000_ETQF4 0x05CC0
#define E1000_ETQF5 0x05CC4
#define E1000_ETQF6 0x05CC8
#define E1000_ETQF7 0x05CCC
/* Split and Replication RX Control - RW */
/*
* Convenience macros

4
drivers/net/igb/igb.h
View File

@ -34,6 +34,8 @@
#include "e1000_mac.h"
#include "e1000_82575.h"
#include <linux/clocksource.h>
struct igb_adapter;
/* Interrupt defines */
@ -251,6 +253,8 @@ struct igb_adapter {
struct napi_struct napi;
struct pci_dev *pdev;
struct net_device_stats net_stats;
struct cyclecounter cycles;
struct timecounter clock;
/* structs defined in e1000_hw.h */
struct e1000_hw hw;

111
drivers/net/igb/igb_main.c
View File

@ -175,6 +175,54 @@ MODULE_DESCRIPTION("Intel(R) Gigabit Ethernet Network Driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);
/**
* Scale the NIC clock cycle by a large factor so that
* relatively small clock corrections can be added or
* substracted at each clock tick. The drawbacks of a
* large factor are a) that the clock register overflows
* more quickly (not such a big deal) and b) that the
* increment per tick has to fit into 24 bits.
*
* Note that
* TIMINCA = IGB_TSYNC_CYCLE_TIME_IN_NANOSECONDS *
* IGB_TSYNC_SCALE
* TIMINCA += TIMINCA * adjustment [ppm] / 1e9
*
* The base scale factor is intentionally a power of two
* so that the division in %struct timecounter can be done with
* a shift.
*/
#define IGB_TSYNC_SHIFT (19)
#define IGB_TSYNC_SCALE (1<<IGB_TSYNC_SHIFT)
/**
* The duration of one clock cycle of the NIC.
*
* @todo This hard-coded value is part of the specification and might change
* in future hardware revisions. Add revision check.
*/
#define IGB_TSYNC_CYCLE_TIME_IN_NANOSECONDS 16
#if (IGB_TSYNC_SCALE * IGB_TSYNC_CYCLE_TIME_IN_NANOSECONDS) >= (1<<24)
# error IGB_TSYNC_SCALE and/or IGB_TSYNC_CYCLE_TIME_IN_NANOSECONDS are too large to fit into TIMINCA
#endif
/**
* igb_read_clock - read raw cycle counter (to be used by time counter)
*/
static cycle_t igb_read_clock(const struct cyclecounter *tc)
{
struct igb_adapter *adapter =
container_of(tc, struct igb_adapter, cycles);
struct e1000_hw *hw = &adapter->hw;
u64 stamp;
stamp = rd32(E1000_SYSTIML);
stamp |= (u64)rd32(E1000_SYSTIMH) << 32ULL;
return stamp;
}
#ifdef DEBUG
/**
* igb_get_hw_dev_name - return device name string
@ -185,6 +233,29 @@ char *igb_get_hw_dev_name(struct e1000_hw *hw)
struct igb_adapter *adapter = hw->back;
return adapter->netdev->name;
}
/**
* igb_get_time_str - format current NIC and system time as string
*/
static char *igb_get_time_str(struct igb_adapter *adapter,
char buffer[160])
{
cycle_t hw = adapter->cycles.read(&adapter->cycles);
struct timespec nic = ns_to_timespec(timecounter_read(&adapter->clock));
struct timespec sys;
struct timespec delta;
getnstimeofday(&sys);
delta = timespec_sub(nic, sys);
sprintf(buffer,
"NIC %ld.%09lus, SYS %ld.%09lus, NIC-SYS %lds + %09luns",
(long)nic.tv_sec, nic.tv_nsec,
(long)sys.tv_sec, sys.tv_nsec,
(long)delta.tv_sec, delta.tv_nsec);
return buffer;
}
#endif
/**
@ -1298,6 +1369,46 @@ static int __devinit igb_probe(struct pci_dev *pdev,
}
#endif
/*
* Initialize hardware timer: we keep it running just in case
* that some program needs it later on.
*/
memset(&adapter->cycles, 0, sizeof(adapter->cycles));
adapter->cycles.read = igb_read_clock;
adapter->cycles.mask = CLOCKSOURCE_MASK(64);
adapter->cycles.mult = 1;
adapter->cycles.shift = IGB_TSYNC_SHIFT;
wr32(E1000_TIMINCA,
(1<<24) |
IGB_TSYNC_CYCLE_TIME_IN_NANOSECONDS * IGB_TSYNC_SCALE);
#if 0
/*
* Avoid rollover while we initialize by resetting the time counter.
*/
wr32(E1000_SYSTIML, 0x00000000);
wr32(E1000_SYSTIMH, 0x00000000);
#else
/*
* Set registers so that rollover occurs soon to test this.
*/
wr32(E1000_SYSTIML, 0x00000000);
wr32(E1000_SYSTIMH, 0xFF800000);
#endif
wrfl();
timecounter_init(&adapter->clock,
&adapter->cycles,
ktime_to_ns(ktime_get_real()));
#ifdef DEBUG
{
char buffer[160];
printk(KERN_DEBUG
"igb: %s: hw %p initialized timer\n",
igb_get_time_str(adapter, buffer),
&adapter->hw);
}
#endif
dev_info(&pdev->dev, "Intel(R) Gigabit Ethernet Network Connection\n");
/* print bus type/speed/width info */
dev_info(&pdev->dev, "%s: (PCIe:%s:%s) %pM\n",