1 // SPDX-License-Identifier: GPL-2.0-only
6  * Inspired by time-efm32.c from Uwe Kleine-Koenig
23 #include "timer-of.h"
50 	int bits;  member
54  * stm32_timer_of_bits_set - set accessor helper
56  * @bits: the number of bits (16 or 32)
58  * Accessor helper to set the number of bits in the timer-of private
62 static void stm32_timer_of_bits_set(struct timer_of *to, int bits)  in stm32_timer_of_bits_set()  argument
64 	struct stm32_timer_private *pd = to->private_data;  in stm32_timer_of_bits_set()
66 	pd->bits = bits;  in stm32_timer_of_bits_set()
70  * stm32_timer_of_bits_get - get accessor helper
73  * Accessor helper to get the number of bits in the timer-of private
76  * Returns: an integer corresponding to the number of bits.
80 	struct stm32_timer_private *pd = to->private_data;  in stm32_timer_of_bits_get()
82 	return pd->bits;  in stm32_timer_of_bits_get()
105  * stm32_timer_start - Start the counter without event
136 	if ((next - now) > evt)  in stm32_clock_event_set_next_event()
137 		return -ETIME;  in stm32_clock_event_set_next_event()
174 	clkevt->event_handler(clkevt);  in stm32_clock_event_handler()
180  * stm32_timer_set_width - Sort out the timer width (32/16)
181  * @to: a pointer to a timer-of structure
183  * Write the 32-bit max value and read/return the result. If the timer
184  * is 32 bits wide, the result will be UINT_MAX, otherwise it will
185  * be truncated by the 16-bit register to USHRT_MAX.
196 	stm32_timer_of_bits_set(to, width == UINT_MAX ? 32 : 16);  in stm32_timer_set_width()
200  * stm32_timer_set_prescaler - Compute and set the prescaler register
201  * @to: a pointer to a timer-of structure
204  * target a 10MHz timer rate for 16 bits. 32-bit timers are
211 	if (stm32_timer_of_bits_get(to) != 32) {  in stm32_timer_set_prescaler()
222 	writel_relaxed(prescaler - 1, timer_of_base(to) + TIM_PSC);  in stm32_timer_set_prescaler()
227 	to->of_clk.rate = DIV_ROUND_CLOSEST(to->of_clk.rate, prescaler);  in stm32_timer_set_prescaler()
228 	to->of_clk.period = DIV_ROUND_UP(to->of_clk.rate, HZ);  in stm32_timer_set_prescaler()
233         u32 bits = stm32_timer_of_bits_get(to);  in stm32_clocksource_init()  local
234 	const char *name = to->np->full_name;  in stm32_clocksource_init()
241 	 * 16-bit timers but only for the 32-bit one, so if no 32-bit  in stm32_clocksource_init()
242 	 * timer is registered yet, we select this 32-bit timer as a  in stm32_clocksource_init()
245 	if (bits == 32 && !stm32_timer_cnt) {  in stm32_clocksource_init()
254 		sched_clock_register(stm32_read_sched_clock, bits, timer_of_rate(to));  in stm32_clocksource_init()
264 				     timer_of_rate(to), bits == 32 ? 250 : 100,  in stm32_clocksource_init()
265 				     bits, clocksource_mmio_readl_up);  in stm32_clocksource_init()
270 	u32 bits = stm32_timer_of_bits_get(to);  in stm32_clockevent_init()  local
272 	to->clkevt.name = to->np->full_name;  in stm32_clockevent_init()
273 	to->clkevt.features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT;  in stm32_clockevent_init()
274 	to->clkevt.set_state_shutdown = stm32_clock_event_shutdown;  in stm32_clockevent_init()
275 	to->clkevt.set_state_periodic = stm32_clock_event_set_periodic;  in stm32_clockevent_init()
276 	to->clkevt.set_state_oneshot = stm32_clock_event_set_oneshot;  in stm32_clockevent_init()
277 	to->clkevt.tick_resume = stm32_clock_event_shutdown;  in stm32_clockevent_init()
278 	to->clkevt.set_next_event = stm32_clock_event_set_next_event;  in stm32_clockevent_init()
279 	to->clkevt.rating = bits == 32 ? 250 : 100;  in stm32_clockevent_init()
281 	clockevents_config_and_register(&to->clkevt, timer_of_rate(to), 0x1,  in stm32_clockevent_init()
282 					(1 <<  bits) - 1);  in stm32_clockevent_init()
284 	pr_info("%pOF: STM32 clockevent driver initialized (%d bits)\n",  in stm32_clockevent_init()
285 		to->np, bits);  in stm32_clockevent_init()
296 		return -ENOMEM;  in stm32_timer_init()
298 	to->flags = TIMER_OF_IRQ | TIMER_OF_CLOCK | TIMER_OF_BASE;  in stm32_timer_init()
299 	to->of_irq.handler = stm32_clock_event_handler;  in stm32_timer_init()
305 	to->private_data = kzalloc(sizeof(struct stm32_timer_private),  in stm32_timer_init()
307 	if (!to->private_data) {  in stm32_timer_init()
308 		ret = -ENOMEM;  in stm32_timer_init()
336 TIMER_OF_DECLARE(stm32, "st,stm32-timer", stm32_timer_init);