1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
10  * 1. Redistributions of source code must retain the above copyright
83 	{"ti,am335x-timer",     1},
84 	{"ti,am335x-timer-1ms", 1},
88 #define	DMTIMER_READ4(sc, reg)		bus_read_4((sc)->tmr_mem_res, (reg))
89 #define	DMTIMER_WRITE4(sc, reg, val)	bus_write_4((sc)->tmr_mem_res, (reg), (val))
97 	sc = et->et_priv;  in am335x_dmtimer_et_start()
100 	 * Stop the timer before changing it.  This routine will often be called  in am335x_dmtimer_et_start()
101 	 * while the timer is still running, to either lengthen or shorten the  in am335x_dmtimer_et_start()
102 	 * current event time.  We need to ensure the timer doesn't expire while  in am335x_dmtimer_et_start()
107 	 * context now, and a timer interrupt could be pending even before we  in am335x_dmtimer_et_start()
108 	 * stopped the timer.  The more likely case is that we're being called  in am335x_dmtimer_et_start()
112 	sc->tclr &= ~(DMT_TCLR_START | DMT_TCLR_AUTOLOAD);  in am335x_dmtimer_et_start()
113 	DMTIMER_WRITE4(sc, DMT_TCLR, sc->tclr);  in am335x_dmtimer_et_start()
117 		reload_count = ((uint32_t)et->et_frequency * period) >> 32;  in am335x_dmtimer_et_start()
118 		sc->tclr |= DMT_TCLR_AUTOLOAD;  in am335x_dmtimer_et_start()
124 		initial_count = ((uint32_t)et->et_frequency * first) >> 32;  in am335x_dmtimer_et_start()
129 	 * Set auto-reload and current-count values.  This timer hardware counts  in am335x_dmtimer_et_start()
132 	DMTIMER_WRITE4(sc, DMT_TLDR, 0xFFFFFFFF - reload_count);  in am335x_dmtimer_et_start()
133 	DMTIMER_WRITE4(sc, DMT_TCRR, 0xFFFFFFFF - initial_count);  in am335x_dmtimer_et_start()
135 	/* Enable overflow interrupt, and start the timer. */  in am335x_dmtimer_et_start()
137 	sc->tclr |= DMT_TCLR_START;  in am335x_dmtimer_et_start()
138 	DMTIMER_WRITE4(sc, DMT_TCLR, sc->tclr);  in am335x_dmtimer_et_start()
148 	sc = et->et_priv;  in am335x_dmtimer_et_stop()
150 	/* Stop timer, disable and clear interrupt. */  in am335x_dmtimer_et_stop()
151 	sc->tclr &= ~(DMT_TCLR_START | DMT_TCLR_AUTOLOAD);  in am335x_dmtimer_et_stop()
152 	DMTIMER_WRITE4(sc, DMT_TCLR, sc->tclr);  in am335x_dmtimer_et_stop()
167 	if (sc->func.et.et_active)  in am335x_dmtimer_et_intr()
168 		sc->func.et.et_event_cb(&sc->func.et, sc->func.et.et_arg);  in am335x_dmtimer_et_intr()
182 	sc->tmr_irq_res = bus_alloc_resource_any(sc->dev, SYS_RES_IRQ,  in am335x_dmtimer_et_init()
183 	    &sc->tmr_irq_rid, RF_ACTIVE);  in am335x_dmtimer_et_init()
184 	if (sc->tmr_irq_res == NULL)  in am335x_dmtimer_et_init()
186 	if (bus_setup_intr(sc->dev, sc->tmr_irq_res, INTR_TYPE_CLK,  in am335x_dmtimer_et_init()
187 	    am335x_dmtimer_et_intr, NULL, sc, &sc->tmr_irq_handler) != 0)  in am335x_dmtimer_et_init()
190 	sc->func.et.et_name = sc->tmr_name;  in am335x_dmtimer_et_init()
191 	sc->func.et.et_flags = ET_FLAGS_PERIODIC | ET_FLAGS_ONESHOT;  in am335x_dmtimer_et_init()
192 	sc->func.et.et_quality = 500;  in am335x_dmtimer_et_init()
193 	sc->func.et.et_frequency = sc->sysclk_freq;  in am335x_dmtimer_et_init()
194 	sc->func.et.et_min_period =  in am335x_dmtimer_et_init()
195 	    ((0x00000005LLU << 32) / sc->func.et.et_frequency);  in am335x_dmtimer_et_init()
196 	sc->func.et.et_max_period =  in am335x_dmtimer_et_init()
197 	    (0xfffffffeLLU << 32) / sc->func.et.et_frequency;  in am335x_dmtimer_et_init()
198 	sc->func.et.et_start = am335x_dmtimer_et_start;  in am335x_dmtimer_et_init()
199 	sc->func.et.et_stop = am335x_dmtimer_et_stop;  in am335x_dmtimer_et_init()
200 	sc->func.et.et_priv = sc;  in am335x_dmtimer_et_init()
203 	et_register(&sc->func.et);  in am335x_dmtimer_et_init()
213 	sc = tc->tc_priv;  in am335x_dmtimer_tc_get_timecount()
228 	sc->tclr |= DMT_TCLR_START | DMT_TCLR_AUTOLOAD;  in am335x_dmtimer_tc_init()
231 	DMTIMER_WRITE4(sc, DMT_TCLR, sc->tclr);  in am335x_dmtimer_tc_init()
233 	sc->func.tc.tc_name           = sc->tmr_name;  in am335x_dmtimer_tc_init()
234 	sc->func.tc.tc_get_timecount  = am335x_dmtimer_tc_get_timecount;  in am335x_dmtimer_tc_init()
235 	sc->func.tc.tc_counter_mask   = ~0u;  in am335x_dmtimer_tc_init()
236 	sc->func.tc.tc_frequency      = sc->sysclk_freq;  in am335x_dmtimer_tc_init()
237 	sc->func.tc.tc_quality        = 500;  in am335x_dmtimer_tc_init()
238 	sc->func.tc.tc_priv           = sc;  in am335x_dmtimer_tc_init()
241 	tc_init(&sc->func.tc);  in am335x_dmtimer_tc_init()
257 	if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)  in am335x_dmtimer_probe()
278 	device_set_descf(dev, "AM335x DMTimer%d", tmr_num);  in am335x_dmtimer_probe()
292 	sc->dev = dev;  in am335x_dmtimer_attach()
295 	err = clk_get_by_ofw_index(dev, 0, 0, &sc->clk_fck);  in am335x_dmtimer_attach()
308 	err = clk_set_parent_by_clk(sc->clk_fck, sys_clkin);  in am335x_dmtimer_attach()
322 	err = clk_get_freq(sc->clk_fck, &sc->sysclk_freq);  in am335x_dmtimer_attach()
329 	sc->tmr_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY,  in am335x_dmtimer_attach()
330 	    &sc->tmr_mem_rid, RF_ACTIVE);  in am335x_dmtimer_attach()
331 	if (sc->tmr_mem_res == NULL) {  in am335x_dmtimer_attach()
338 			sc->tmr_num = 2;  in am335x_dmtimer_attach()
341 			sc->tmr_num = 3;  in am335x_dmtimer_attach()
344 			device_printf(dev, "Not timer 2 or 3! %#jx\n",  in am335x_dmtimer_attach()
349 	snprintf(sc->tmr_name, sizeof(sc->tmr_name), "DMTimer%d", sc->tmr_num);  in am335x_dmtimer_attach()
355 	if (sc->tmr_num == ET_TMR_NUM)  in am335x_dmtimer_attach()
357 	else if (sc->tmr_num == TC_TMR_NUM)  in am335x_dmtimer_attach()
360 		panic("am335x_dmtimer: bad timer number %d", sc->tmr_num);  in am335x_dmtimer_attach()
378 MODULE_DEPEND(am335x_dmtimer, ti_sysc, 1, 1, 1);
388 	counts = (usec + 1) * (sc->sysclk_freq / 1000000);  in am335x_dmtimer_delay()
395 			counts -= (int32_t)(last - first);  in am335x_dmtimer_delay()
397 			counts -= (int32_t)((0xFFFFFFFF - first) + last);  in am335x_dmtimer_delay()