1 // SPDX-License-Identifier: GPL-2.0
3  * Clocksource driver for NXP LPC32xx/18xx/43xx timer
8  * time-efm32 Copyright (C) 2013 Pengutronix
9  * mach-lpc32xx/timer.c Copyright (C) 2009 - 2010 NXP Semiconductors
70 	 * Place timer in reset and program the delta in the match  in lpc32xx_clkevt_next_event()
71 	 * channel 0 (MR0). When the timer counter matches the value  in lpc32xx_clkevt_next_event()
73 	 * After setup the timer is released from reset and enabled.  in lpc32xx_clkevt_next_event()
75 	writel_relaxed(LPC32XX_TIMER_TCR_CRST, ddata->base + LPC32XX_TIMER_TCR);  in lpc32xx_clkevt_next_event()
76 	writel_relaxed(delta, ddata->base + LPC32XX_TIMER_MR0);  in lpc32xx_clkevt_next_event()
77 	writel_relaxed(LPC32XX_TIMER_TCR_CEN, ddata->base + LPC32XX_TIMER_TCR);  in lpc32xx_clkevt_next_event()
87 	/* Disable the timer */  in lpc32xx_clkevt_shutdown()
88 	writel_relaxed(0, ddata->base + LPC32XX_TIMER_TCR);  in lpc32xx_clkevt_shutdown()
99 	 * When using oneshot, we must also disable the timer  in lpc32xx_clkevt_oneshot()
102 	writel_relaxed(0, ddata->base + LPC32XX_TIMER_TCR);  in lpc32xx_clkevt_oneshot()
106 		       LPC32XX_TIMER_MCR_MR0S, ddata->base + LPC32XX_TIMER_MCR);  in lpc32xx_clkevt_oneshot()
117 		       ddata->base + LPC32XX_TIMER_MCR);  in lpc32xx_clkevt_periodic()
120 	 * Place timer in reset and program the delta in the match  in lpc32xx_clkevt_periodic()
123 	writel_relaxed(LPC32XX_TIMER_TCR_CRST, ddata->base + LPC32XX_TIMER_TCR);  in lpc32xx_clkevt_periodic()
124 	writel_relaxed(ddata->ticks_per_jiffy, ddata->base + LPC32XX_TIMER_MR0);  in lpc32xx_clkevt_periodic()
125 	writel_relaxed(LPC32XX_TIMER_TCR_CEN, ddata->base + LPC32XX_TIMER_TCR);  in lpc32xx_clkevt_periodic()
135 	writel_relaxed(LPC32XX_TIMER_IR_MR0INT, ddata->base + LPC32XX_TIMER_IR);  in lpc32xx_clock_event_handler()
137 	ddata->evtdev.event_handler(&ddata->evtdev);  in lpc32xx_clock_event_handler()
144 		.name			= "lpc3220 clockevent",
177 		ret = -EADDRNOTAVAIL;  in lpc32xx_clocksource_init()
182 	 * Disable and reset timer then set it to free running timer  in lpc32xx_clocksource_init()
184 	 * After setup the timer is released from reset and enabled.  in lpc32xx_clocksource_init()
193 	ret = clocksource_mmio_init(base + LPC32XX_TIMER_TC, "lpc3220 timer",  in lpc32xx_clocksource_init()
238 		ret = -EADDRNOTAVAIL;  in lpc32xx_clockevent_init()
245 		ret = -ENOENT;  in lpc32xx_clockevent_init()
250 	 * Disable timer and clear any pending interrupt (IR) on match  in lpc32xx_clockevent_init()
262 					rate, 1, -1);  in lpc32xx_clockevent_init()
265 			  IRQF_TIMER | IRQF_IRQPOLL, "lpc3220 clockevent",  in lpc32xx_clockevent_init()
310 TIMER_OF_DECLARE(lpc32xx_timer, "nxp,lpc3220-timer", lpc32xx_timer_init);