1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright(c) 1999 - 2018 Intel Corporation. */
4 /* PTP 1588 Hardware Clock (PHC)
5  * Derived from PTP Hardware Clock driver for Intel 82576 and 82580 (igb)
18  * e1000e_phc_adjfine - adjust the frequency of the hardware clock
19  * @ptp: ptp clock structure
20  * @delta: Desired frequency chance in scaled parts per million
22  * Adjust the frequency of the PHC cycle counter by the indicated delta from
23  * the base frequency.
31 	struct e1000_hw *hw = &adapter->hw;  in e1000e_phc_adjfine()
37 	/* Get the System Time Register SYSTIM base frequency */  in e1000e_phc_adjfine()
42 	spin_lock_irqsave(&adapter->systim_lock, flags);  in e1000e_phc_adjfine()
52 	adapter->ptp_delta = delta;  in e1000e_phc_adjfine()
54 	spin_unlock_irqrestore(&adapter->systim_lock, flags);  in e1000e_phc_adjfine()
60  * e1000e_phc_adjtime - Shift the time of the hardware clock
61  * @ptp: ptp clock structure
72 	spin_lock_irqsave(&adapter->systim_lock, flags);  in e1000e_phc_adjtime()
73 	timecounter_adjtime(&adapter->tc, delta);  in e1000e_phc_adjtime()
74 	spin_unlock_irqrestore(&adapter->systim_lock, flags);  in e1000e_phc_adjtime()
83  * e1000e_phc_get_syncdevicetime - Callback given to timekeeping code reads system/device registers
85  * @system: system counter value read synchronously with device time
88  * Read device and system (ART) clock simultaneously and return the corrected
89  * clock values in ns.
92 					 struct system_counterval_t *system,  in e1000e_phc_get_syncdevicetime()  argument
96 	struct e1000_hw *hw = &adapter->hw;  in e1000e_phc_get_syncdevicetime()
115 		return -ETIMEDOUT;  in e1000e_phc_get_syncdevicetime()
120 	spin_lock_irqsave(&adapter->systim_lock, flags);  in e1000e_phc_get_syncdevicetime()
121 	*device = ns_to_ktime(timecounter_cyc2time(&adapter->tc, dev_cycles));  in e1000e_phc_get_syncdevicetime()
122 	spin_unlock_irqrestore(&adapter->systim_lock, flags);  in e1000e_phc_get_syncdevicetime()
127 	system->cycles = sys_cycles;  in e1000e_phc_get_syncdevicetime()
128 	system->cs_id = CSID_X86_ART;  in e1000e_phc_get_syncdevicetime()
134  * e1000e_phc_getcrosststamp - Reads the current system/device cross timestamp
135  * @ptp: ptp clock structure
138  * Read device and system (ART) clock simultaneously and return the scaled
139  * clock values in ns.
153  * e1000e_phc_gettimex - Reads the current time from the hardware clock and
154  *                       system clock
155  * @ptp: ptp clock structure
157  * @sts: structure to hold the current system time
171 	spin_lock_irqsave(&adapter->systim_lock, flags);  in e1000e_phc_gettimex()
173 	/* NOTE: Non-monotonic SYSTIM readings may be returned */  in e1000e_phc_gettimex()
175 	ns = timecounter_cyc2time(&adapter->tc, cycles);  in e1000e_phc_gettimex()
177 	spin_unlock_irqrestore(&adapter->systim_lock, flags);  in e1000e_phc_gettimex()
185  * e1000e_phc_settime - Set the current time on the hardware clock
186  * @ptp: ptp clock structure
203 	spin_lock_irqsave(&adapter->systim_lock, flags);  in e1000e_phc_settime()
204 	timecounter_init(&adapter->tc, &adapter->cc, ns);  in e1000e_phc_settime()
205 	spin_unlock_irqrestore(&adapter->systim_lock, flags);  in e1000e_phc_settime()
211  * e1000e_phc_enable - enable or disable an ancillary feature
212  * @ptp: ptp clock structure
223 	return -EOPNOTSUPP;  in e1000e_phc_enable()
230 	struct e1000_hw *hw = &adapter->hw;  in e1000e_systim_overflow_work()
235 	ns = timecounter_read(&adapter->tc);  in e1000e_systim_overflow_work()
241 	schedule_delayed_work(&adapter->systim_overflow_work,  in e1000e_systim_overflow_work()
260  * e1000e_ptp_init - initialize PTP for devices which support it
269 	struct e1000_hw *hw = &adapter->hw;  in e1000e_ptp_init()
271 	adapter->ptp_clock = NULL;  in e1000e_ptp_init()
273 	if (!(adapter->flags & FLAG_HAS_HW_TIMESTAMP))  in e1000e_ptp_init()
276 	adapter->ptp_clock_info = e1000e_ptp_clock_info;  in e1000e_ptp_init()
278 	snprintf(adapter->ptp_clock_info.name,  in e1000e_ptp_init()
279 		 sizeof(adapter->ptp_clock_info.name), "%pm",  in e1000e_ptp_init()
280 		 adapter->netdev->perm_addr);  in e1000e_ptp_init()
282 	switch (hw->mac.type) {  in e1000e_ptp_init()
284 		adapter->ptp_clock_info.max_adj = MAX_PPB_96MHZ;  in e1000e_ptp_init()
288 			adapter->ptp_clock_info.max_adj = MAX_PPB_96MHZ;  in e1000e_ptp_init()
290 			adapter->ptp_clock_info.max_adj = MAX_PPB_25MHZ;  in e1000e_ptp_init()
293 		adapter->ptp_clock_info.max_adj = MAX_PPB_24MHZ;  in e1000e_ptp_init()
303 			adapter->ptp_clock_info.max_adj = MAX_PPB_24MHZ;  in e1000e_ptp_init()
305 			adapter->ptp_clock_info.max_adj = MAX_PPB_38400KHZ;  in e1000e_ptp_init()
309 		adapter->ptp_clock_info.max_adj = MAX_PPB_25MHZ;  in e1000e_ptp_init()
317 	if (hw->mac.type >= e1000_pch_spt && boot_cpu_has(X86_FEATURE_ART))  in e1000e_ptp_init()
318 		adapter->ptp_clock_info.getcrosststamp =  in e1000e_ptp_init()
322 	INIT_DELAYED_WORK(&adapter->systim_overflow_work,  in e1000e_ptp_init()
325 	schedule_delayed_work(&adapter->systim_overflow_work,  in e1000e_ptp_init()
328 	adapter->ptp_clock = ptp_clock_register(&adapter->ptp_clock_info,  in e1000e_ptp_init()
329 						&adapter->pdev->dev);  in e1000e_ptp_init()
330 	if (IS_ERR(adapter->ptp_clock)) {  in e1000e_ptp_init()
331 		adapter->ptp_clock = NULL;  in e1000e_ptp_init()
333 	} else if (adapter->ptp_clock) {  in e1000e_ptp_init()
334 		e_info("registered PHC clock\n");  in e1000e_ptp_init()
339  * e1000e_ptp_remove - disable PTP device and stop the overflow check
346 	if (!(adapter->flags & FLAG_HAS_HW_TIMESTAMP))  in e1000e_ptp_remove()
349 	cancel_delayed_work_sync(&adapter->systim_overflow_work);  in e1000e_ptp_remove()
351 	if (adapter->ptp_clock) {  in e1000e_ptp_remove()
352 		ptp_clock_unregister(adapter->ptp_clock);  in e1000e_ptp_remove()
353 		adapter->ptp_clock = NULL;  in e1000e_ptp_remove()