1 /*-
53  * variable-duty-cycle PWM output.
62 #define	PWM_LOCK(_sc)		mtx_lock(&(_sc)->sc_mtx)
63 #define	PWM_UNLOCK(_sc)		mtx_unlock(&(_sc)->sc_mtx)
64 #define	PWM_LOCK_ASSERT(_sc)    mtx_assert(&(_sc)->sc_mtx, MA_OWNED)
65 #define	PWM_LOCK_INIT(_sc)	mtx_init(&(_sc)->sc_mtx, \
66     device_get_nameunit(_sc->sc_dev), "am335x_ehrpwm softc", MTX_DEF)
67 #define	PWM_LOCK_DESTROY(_sc)	mtx_destroy(&(_sc)->sc_mtx)
69 #define	EPWM_READ2(_sc, reg)	bus_read_2((_sc)->sc_mem_res, reg)
71     bus_write_2((_sc)->sc_mem_res, reg, value)
102 /* Counter-compare */
142 /* Trip-Zone module */
155 /* PWM-chopper */
161 /* High-Resolution PWM */
174 	bool	inverted;	/* signal inverted? */  member
193 	{"ti,am3352-ehrpwm",    true},
194 	{"ti,am33xx-ehrpwm",    true},
207 		tbcmp = max(1, duty / sc->sc_clktick);  in am335x_ehrpwm_cfg_duty()
209 	sc->sc_channels[chan].duty = tbcmp * sc->sc_clktick;  in am335x_ehrpwm_cfg_duty()
220 	sc->sc_channels[chan].enabled = enable;  in am335x_ehrpwm_cfg_enable()
223 	 * Turn off any existing software-force of the channel, then force  in am335x_ehrpwm_cfg_enable()
229 	if (!sc->sc_channels[chan].enabled) {  in am335x_ehrpwm_cfg_enable()
230 		if (sc->sc_channels[chan].inverted)  in am335x_ehrpwm_cfg_enable()
246 		sc->sc_clkfreq = 0;  in am335x_ehrpwm_cfg_period()
247 		sc->sc_clktick = 0;  in am335x_ehrpwm_cfg_period()
248 		sc->sc_period  = 0;  in am335x_ehrpwm_cfg_period()
254 	 * that we can express the requested period as a 16-bit tick count.  in am335x_ehrpwm_cfg_period()
258 		const u_int cd = 1 << clkdiv;  in am335x_ehrpwm_cfg_period()  local
261 			pwmclk = PWM_CLOCK / (cd * cdhs);  in am335x_ehrpwm_cfg_period()
280 	if (sc->sc_clkfreq != pwmclk || sc->sc_clktick != pwmtick ||  in am335x_ehrpwm_cfg_period()
281 	    sc->sc_period != tbprd * pwmtick) {  in am335x_ehrpwm_cfg_period()
282 		sc->sc_clkfreq = pwmclk;  in am335x_ehrpwm_cfg_period()
283 		sc->sc_clktick = pwmtick;  in am335x_ehrpwm_cfg_period()
284 		sc->sc_period  = tbprd * pwmtick;  in am335x_ehrpwm_cfg_period()
291 		EPWM_WRITE2(sc, EPWM_TBPRD, tbprd - 1);  in am335x_ehrpwm_cfg_period()
293 		device_printf(sc->sc_dev, "clkdiv %u hspclkdiv %u tbprd %u "  in am335x_ehrpwm_cfg_period()
295 		    clkdiv, hspclkdiv, tbprd - 1,  in am335x_ehrpwm_cfg_period()
296 		    sc->sc_clkfreq, sc->sc_clktick, sc->sc_period, period);  in am335x_ehrpwm_cfg_period()
348 	*period = sc->sc_period;  in am335x_ehrpwm_channel_get_config()
349 	*duty = sc->sc_channels[channel].duty;  in am335x_ehrpwm_channel_get_config()
366 		sc->sc_channels[channel].inverted = true;  in am335x_ehrpwm_channel_set_flags()
367 		/* Action-Qualifier 15.2.2.5 */  in am335x_ehrpwm_channel_set_flags()
375 		sc->sc_channels[channel].inverted = false;  in am335x_ehrpwm_channel_set_flags()
398 	if (sc->sc_channels[channel].inverted == true)  in am335x_ehrpwm_channel_get_flags()
434 	*enabled = sc->sc_channels[channel].enabled;  in am335x_ehrpwm_channel_is_enabled()
446 	if (!ofw_bus_search_compatible(dev, compat_data)->ocd_data)  in am335x_ehrpwm_probe()
461 	sc->sc_dev = dev;  in am335x_ehrpwm_attach()
465 	sc->sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY,  in am335x_ehrpwm_attach()
466 	    &sc->sc_mem_rid, RF_ACTIVE);  in am335x_ehrpwm_attach()
467 	if (sc->sc_mem_res == NULL) {  in am335x_ehrpwm_attach()
477 	EPWM_WRITE2(sc, EPWM_TBPRD, DEFAULT_PWM_PERIOD - 1);  in am335x_ehrpwm_attach()
481 	/* Action-Qualifier 15.2.2.5 */  in am335x_ehrpwm_attach()
491 	/* PWM-chopper described in 15.2.2.7 */  in am335x_ehrpwm_attach()
493 	 * to control the power switching-elements  in am335x_ehrpwm_attach()
504 	/* disable TZn as one-shot / CVC trip source 15.2.4.18 */  in am335x_ehrpwm_attach()
515 	if ((sc->sc_busdev = device_add_child(dev, "pwmbus", -1)) == NULL) {  in am335x_ehrpwm_attach()
525 	if (sc->sc_mem_res)  in am335x_ehrpwm_attach()
527 		    sc->sc_mem_rid, sc->sc_mem_res);  in am335x_ehrpwm_attach()
540 	if ((error = bus_generic_detach(sc->sc_dev)) != 0)  in am335x_ehrpwm_detach()
545 	if (sc->sc_busdev != NULL)  in am335x_ehrpwm_detach()
546 		device_delete_child(dev, sc->sc_busdev);  in am335x_ehrpwm_detach()
548 	if (sc->sc_mem_res)  in am335x_ehrpwm_detach()
550 		    sc->sc_mem_rid, sc->sc_mem_res);  in am335x_ehrpwm_detach()