1 // SPDX-License-Identifier: GPL-2.0-only
6  * samsung - Common hr-timer support (s3c and s5p)
41 #define TCFG1_SHIFT(x)	  		((x) * 4)
45  * Each channel occupies 4 bits in TCON register, but there is a gap of 4
46  * bits (one channel) after channel 0, so channels have different numbering
49  * In addition, the location of autoreload bit for channel 4 (TCON channel 5)
52 #define TCON_START(chan)		(1 << (4 * (chan) + 0))
53 #define TCON_MANUALUPDATE(chan)		(1 << (4 * (chan) + 1))
54 #define TCON_INVERT(chan)		(1 << (4 * (chan) + 2))
55 #define _TCON_AUTORELOAD(chan)		(1 << (4 * (chan) + 3))
56 #define _TCON_AUTORELOAD4(chan)		(1 << (4 * (chan) + 2))
82 static void samsung_timer_set_prescale(unsigned int channel, u16 prescale)  in samsung_timer_set_prescale()  argument
88 	if (channel >= 2)  in samsung_timer_set_prescale()
95 	reg |= (prescale - 1) << shift;  in samsung_timer_set_prescale()
101 static void samsung_timer_set_divisor(unsigned int channel, u8 divisor)  in samsung_timer_set_divisor()  argument
103 	u8 shift = TCFG1_SHIFT(channel);  in samsung_timer_set_divisor()
108 	bits = (fls(divisor) - 1) - pwm.variant.div_base;  in samsung_timer_set_divisor()
120 static void samsung_time_stop(unsigned int channel)  in samsung_time_stop()  argument
125 	if (channel > 0)  in samsung_time_stop()
126 		++channel;  in samsung_time_stop()
131 	tcon &= ~TCON_START(channel);  in samsung_time_stop()
137 static void samsung_time_setup(unsigned int channel, unsigned long tcnt)  in samsung_time_setup()  argument
141 	unsigned int tcon_chan = channel;  in samsung_time_setup()
153 	writel_relaxed(tcnt, pwm.base + REG_TCNTB(channel));  in samsung_time_setup()
154 	writel_relaxed(tcnt, pwm.base + REG_TCMPB(channel));  in samsung_time_setup()
160 static void samsung_time_start(unsigned int channel, bool periodic)  in samsung_time_start()  argument
165 	if (channel > 0)  in samsung_time_start()
166 		++channel;  in samsung_time_start()
172 	tcon &= ~TCON_MANUALUPDATE(channel);  in samsung_time_start()
173 	tcon |= TCON_START(channel);  in samsung_time_start()
176 		tcon |= TCON_AUTORELOAD(channel);  in samsung_time_start()
178 		tcon &= ~TCON_AUTORELOAD(channel);  in samsung_time_start()
216 	samsung_time_setup(pwm.event_id, pwm.clock_count_per_tick - 1);  in samsung_set_periodic()
254 	evt->event_handler(evt);  in samsung_clock_event_isr()
344 	if (pwm.source_id == 4)  in samsung_clocksource_init()
360 	pwm.tcnt_max = (1UL << pwm.variant.bits) - 1;  in samsung_timer_resources()
376 	int channel;  in _samsung_pwm_clocksource_init()  local
378 	mask = ~pwm.variant.output_mask & ((1 << SAMSUNG_PWM_NUM) - 1);  in _samsung_pwm_clocksource_init()
379 	channel = fls(mask) - 1;  in _samsung_pwm_clocksource_init()
380 	if (channel < 0) {  in _samsung_pwm_clocksource_init()
381 		pr_crit("failed to find PWM channel for clocksource\n");  in _samsung_pwm_clocksource_init()
382 		return -EINVAL;  in _samsung_pwm_clocksource_init()
384 	pwm.source_id = channel;  in _samsung_pwm_clocksource_init()
386 	mask &= ~(1 << channel);  in _samsung_pwm_clocksource_init()
387 	channel = fls(mask) - 1;  in _samsung_pwm_clocksource_init()
388 	if (channel < 0) {  in _samsung_pwm_clocksource_init()
389 		pr_crit("failed to find PWM channel for clock event\n");  in _samsung_pwm_clocksource_init()
390 		return -EINVAL;  in _samsung_pwm_clocksource_init()
392 	pwm.event_id = channel;  in _samsung_pwm_clocksource_init()
427 	of_property_for_each_u32(np, "samsung,pwm-outputs", prop, cur, val) {  in samsung_pwm_alloc()
429 			pr_warn("%s: invalid channel index in samsung,pwm-outputs property\n", __func__);  in samsung_pwm_alloc()
438 		return -ENXIO;  in samsung_pwm_alloc()
454 	.tclk_mask	= (1 << 4),
461 TIMER_OF_DECLARE(s3c2410_pwm, "samsung,s3c2410-pwm", s3c2410_pwm_clocksource_init);
474 TIMER_OF_DECLARE(s3c6400_pwm, "samsung,s3c6400-pwm", s3c64xx_pwm_clocksource_init);
487 TIMER_OF_DECLARE(s5p6440_pwm, "samsung,s5p6440-pwm", s5p64x0_pwm_clocksource_init);
500 TIMER_OF_DECLARE(s5pc100_pwm, "samsung,s5pc100-pwm", s5p_pwm_clocksource_init);