1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
51 	    bus_space_write_4((_sc)->sc_iot, (_sc)->sc_ioh, (_r), (_v))
53 	    bus_space_read_4((_sc)->sc_iot, (_sc)->sc_ioh, (_r))
97 	{ -1, 0 }
101 	{"fsl,imx6dl-gpt", 1},
102 	{"fsl,imx6q-gpt",  1},
103 	{"fsl,imx6ul-gpt", 1},
104 	{"fsl,imx53-gpt",  1},
105 	{"fsl,imx51-gpt",  1},
106 	{"fsl,imx31-gpt",  1},
107 	{"fsl,imx27-gpt",  1},
108 	{"fsl,imx25-gpt",  1},
120 	 *  We only support a single unit, because the only thing this driver  in imx_gpt_probe()
128 	if (ofw_bus_search_compatible(dev, compat_data)->ocd_data != 0) {  in imx_gpt_probe()
145 	if (bus_alloc_resources(dev, imx_gpt_spec, sc->res)) {  in imx_gpt_attach()
150 	sc->sc_dev = dev;  in imx_gpt_attach()
151 	sc->sc_iot = rman_get_bustag(sc->res[0]);  in imx_gpt_attach()
152 	sc->sc_ioh = rman_get_bushandle(sc->res[0]);  in imx_gpt_attach()
159 	sc->sc_clksrc = GPT_CR_CLKSRC_IPG;  in imx_gpt_attach()
163 	switch (sc->sc_clksrc) {  in imx_gpt_attach()
181 		    sc->sc_clksrc);  in imx_gpt_attach()
194 	/* Choose the clock and the power-saving behaviors. */  in imx_gpt_attach()
196 	    sc->sc_clksrc |	/* Use selected clock */  in imx_gpt_attach()
219 		sc->clkfreq = basefreq;  in imx_gpt_attach()
222 		sc->clkfreq = basefreq / prescale;  in imx_gpt_attach()
223 		prescale -= 1; /* 1..n range is 0..n-1 in hardware. */  in imx_gpt_attach()
235 		    sc->clkfreq / 1000, basefreq, READ4(sc, IMX_GPT_CR), READ4(sc, IMX_GPT_PR));  in imx_gpt_attach()
238 	err = bus_setup_intr(dev, sc->res[1], INTR_TYPE_CLK, imx_gpt_intr,  in imx_gpt_attach()
239 	    NULL, sc, &sc->sc_ih);  in imx_gpt_attach()
241 		bus_release_resources(dev, imx_gpt_spec, sc->res);  in imx_gpt_attach()
248 	 * Measure how many clock ticks it takes to setup a one-shot event (it's  in imx_gpt_attach()
257 	setup_ticks = ((t2 - t1 + 1) * 3) / 2;  in imx_gpt_attach()
260 	sc->et.et_name = "iMXGPT";  in imx_gpt_attach()
261 	sc->et.et_flags = ET_FLAGS_ONESHOT | ET_FLAGS_PERIODIC;  in imx_gpt_attach()
262 	sc->et.et_quality = 800;  in imx_gpt_attach()
263 	sc->et.et_frequency = sc->clkfreq;  in imx_gpt_attach()
264 	sc->et.et_min_period = ((uint64_t)setup_ticks << 32) / sc->clkfreq;  in imx_gpt_attach()
265 	sc->et.et_max_period = ((uint64_t)0xfffffffe  << 32) / sc->clkfreq;  in imx_gpt_attach()
266 	sc->et.et_start = imx_gpt_timer_start;  in imx_gpt_attach()
267 	sc->et.et_stop = imx_gpt_timer_stop;  in imx_gpt_attach()
268 	sc->et.et_priv = sc;  in imx_gpt_attach()
269 	et_register(&sc->et);  in imx_gpt_attach()
272 	imx_gpt_timecounter.tc_frequency = sc->clkfreq;  in imx_gpt_attach()
290 	sc = (struct imx_gpt_softc *)et->et_priv;  in imx_gpt_timer_start()
293 		sc->sc_period = ((uint32_t)et->et_frequency * period) >> 32;  in imx_gpt_timer_start()
295 		WRITE4(sc, IMX_GPT_OCR2, READ4(sc, IMX_GPT_CNT) + sc->sc_period);  in imx_gpt_timer_start()
297 		sc->ir_reg |= GPT_IR_OF2;  in imx_gpt_timer_start()
298 		WRITE4(sc, IMX_GPT_IR, sc->ir_reg);  in imx_gpt_timer_start()
302 		if ((sc->ir_reg & GPT_IR_OF3) == 0) {  in imx_gpt_timer_start()
303 			sc->ir_reg |= GPT_IR_OF3;  in imx_gpt_timer_start()
304 			WRITE4(sc, IMX_GPT_IR, sc->ir_reg);  in imx_gpt_timer_start()
306 		ticks = ((uint32_t)et->et_frequency * first) >> 32;  in imx_gpt_timer_start()
324 	sc = (struct imx_gpt_softc *)et->et_priv;  in imx_gpt_timer_stop()
327 	sc->ir_reg &= ~(GPT_IR_OF2 | GPT_IR_OF3);  in imx_gpt_timer_stop()
328 	WRITE4(sc, IMX_GPT_IR, sc->ir_reg);  in imx_gpt_timer_stop()
330 	sc->sc_period = 0;  in imx_gpt_timer_stop()
347 	* often sets up a new one-shot timer event and if the interval is short  in imx_gpt_intr()
353 	/* Handle one-shot timer events. */  in imx_gpt_intr()
355 		if (sc->et.et_active) {  in imx_gpt_intr()
356 			sc->et.et_event_cb(&sc->et, sc->et.et_arg);  in imx_gpt_intr()
362 		if (sc->et.et_active)  in imx_gpt_intr()
363 			sc->et.et_event_cb(&sc->et, sc->et.et_arg);  in imx_gpt_intr()
364 		if (sc->sc_period != 0)  in imx_gpt_intr()
366 			    sc->sc_period);  in imx_gpt_intr()
377 	sc = tc->tc_priv;  in imx_gpt_get_timecount()
403 	 * Calculate the tick count with 64-bit values so that it works for any  in imx_gpt_do_delay()
405 	 * If the 32-bit hardware count rolls over while we're looping, just  in imx_gpt_do_delay()
407 	 * that doing this on each loop iteration is inefficient -- we're trying  in imx_gpt_do_delay()
410 	ticks = 1 + ((uint64_t)usec * sc->clkfreq) / 1000000;  in imx_gpt_do_delay()