1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * Freescale FlexTimer Module (FTM) timer driver.
18 #include <linux/fsl/ftm.h>
34 	if (priv->big_endian)  in ftm_readl()
42 	if (priv->big_endian)  in ftm_writel()
52 	/* select and enable counter clock source */  in ftm_counter_enable()
55 	val |= priv->ps | FTM_SC_CLK(1);  in ftm_counter_enable()
63 	/* disable counter clock source */  in ftm_counter_disable()
99 	 * The CNT register contains the FTM counter value.  in ftm_reset_counter()
101 	 * updates the counter with its initial value, CNTIN.  in ftm_reset_counter()
108 	return ftm_readl(priv->clksrc_base + FTM_CNT);  in ftm_read_sched_clock()
119 	 * a, the counter source clock is disabled.  in ftm_set_next_event()
121 	ftm_counter_disable(priv->clkevt_base);  in ftm_set_next_event()
123 	/* Force the value of CNTIN to be loaded into the FTM counter */  in ftm_set_next_event()
124 	ftm_reset_counter(priv->clkevt_base);  in ftm_set_next_event()
127 	 * The counter increments until the value of MOD is reached,  in ftm_set_next_event()
128 	 * at which point the counter is reloaded with the value of CNTIN.  in ftm_set_next_event()
129 	 * The TOF (the overflow flag) bit is set when the FTM counter  in ftm_set_next_event()
130 	 * changes from MOD to CNTIN. So we should using the delta - 1.  in ftm_set_next_event()
132 	ftm_writel(delta - 1, priv->clkevt_base + FTM_MOD);  in ftm_set_next_event()
134 	ftm_counter_enable(priv->clkevt_base);  in ftm_set_next_event()
136 	ftm_irq_enable(priv->clkevt_base);  in ftm_set_next_event()
143 	ftm_counter_disable(priv->clkevt_base);  in ftm_set_oneshot()
149 	ftm_set_next_event(priv->periodic_cyc, evt);  in ftm_set_periodic()
157 	ftm_irq_acknowledge(priv->clkevt_base);  in ftm_evt_interrupt()
160 		ftm_irq_disable(priv->clkevt_base);  in ftm_evt_interrupt()
161 		ftm_counter_disable(priv->clkevt_base);  in ftm_evt_interrupt()
164 	evt->event_handler(evt);  in ftm_evt_interrupt()
170 	.name			= "Freescale ftm timer",
183 	ftm_writel(0x00, priv->clkevt_base + FTM_CNTIN);  in ftm_clockevent_init()
184 	ftm_writel(~0u, priv->clkevt_base + FTM_MOD);  in ftm_clockevent_init()
186 	ftm_reset_counter(priv->clkevt_base);  in ftm_clockevent_init()
189 			  "Freescale ftm timer", &ftm_clockevent);  in ftm_clockevent_init()
191 		pr_err("ftm: setup irq failed: %d\n", err);  in ftm_clockevent_init()
199 					freq / (1 << priv->ps),  in ftm_clockevent_init()
202 	ftm_counter_enable(priv->clkevt_base);  in ftm_clockevent_init()
211 	ftm_writel(0x00, priv->clksrc_base + FTM_CNTIN);  in ftm_clocksource_init()
212 	ftm_writel(~0u, priv->clksrc_base + FTM_MOD);  in ftm_clocksource_init()
214 	ftm_reset_counter(priv->clksrc_base);  in ftm_clocksource_init()
216 	sched_clock_register(ftm_read_sched_clock, 16, freq / (1 << priv->ps));  in ftm_clocksource_init()
217 	err = clocksource_mmio_init(priv->clksrc_base + FTM_CNT, "fsl-ftm",  in ftm_clocksource_init()
218 				    freq / (1 << priv->ps), 300, 16,  in ftm_clocksource_init()
221 		pr_err("ftm: init clock source mmio failed: %d\n", err);  in ftm_clocksource_init()
225 	ftm_counter_enable(priv->clksrc_base);  in ftm_clocksource_init()
238 		pr_err("ftm: Cannot get \"%s\": %ld\n", cnt_name, PTR_ERR(clk));  in __ftm_clk_init()
243 		pr_err("ftm: clock failed to prepare+enable \"%s\": %d\n",  in __ftm_clk_init()
250 		pr_err("ftm: Cannot get \"%s\": %ld\n", ftm_name, PTR_ERR(clk));  in __ftm_clk_init()
255 		pr_err("ftm: clock failed to prepare+enable \"%s\": %d\n",  in __ftm_clk_init()
265 	freq = __ftm_clk_init(np, "ftm-evt-counter-en", "ftm-evt");  in ftm_clk_init()
269 	freq = __ftm_clk_init(np, "ftm-src-counter-en", "ftm-src");  in ftm_clk_init()
278 	priv->ps = 0;  in ftm_calc_closest_round_cyc()
280 	/* The counter register is only using the lower 16 bits, and  in ftm_calc_closest_round_cyc()
285 		priv->periodic_cyc = DIV_ROUND_CLOSEST(freq,  in ftm_calc_closest_round_cyc()
286 						HZ * (1 << priv->ps++));  in ftm_calc_closest_round_cyc()
287 	} while (priv->periodic_cyc > 0xFFFF);  in ftm_calc_closest_round_cyc()
289 	if (priv->ps > FTM_PS_MAX) {  in ftm_calc_closest_round_cyc()
290 		pr_err("ftm: the prescaler is %lu > %d\n",  in ftm_calc_closest_round_cyc()
291 				priv->ps, FTM_PS_MAX);  in ftm_calc_closest_round_cyc()
292 		return -EINVAL;  in ftm_calc_closest_round_cyc()
305 		return -ENOMEM;  in ftm_timer_init()
307 	ret = -ENXIO;  in ftm_timer_init()
308 	priv->clkevt_base = of_iomap(np, 0);  in ftm_timer_init()
309 	if (!priv->clkevt_base) {  in ftm_timer_init()
310 		pr_err("ftm: unable to map event timer registers\n");  in ftm_timer_init()
314 	priv->clksrc_base = of_iomap(np, 1);  in ftm_timer_init()
315 	if (!priv->clksrc_base) {  in ftm_timer_init()
316 		pr_err("ftm: unable to map source timer registers\n");  in ftm_timer_init()
320 	ret = -EINVAL;  in ftm_timer_init()
323 		pr_err("ftm: unable to get IRQ from DT, %d\n", irq);  in ftm_timer_init()
327 	priv->big_endian = of_property_read_bool(np, "big-endian");  in ftm_timer_init()
348 	iounmap(priv->clksrc_base);  in ftm_timer_init()
350 	iounmap(priv->clkevt_base);  in ftm_timer_init()
355 TIMER_OF_DECLARE(flextimer, "fsl,ftm-timer", ftm_timer_init);