1 // SPDX-License-Identifier: GPL-2.0-only
6  * samsung - Common hr-timer support (s3c and s5p)
44  * Each channel occupies 4 bits in TCON register, but there is a gap of 4
45  * bits (one channel) after channel 0, so channels have different numbering
46  * when accessing TCON register.
48  * In addition, the location of autoreload bit for channel 4 (TCON channel 5)
81 static void samsung_timer_set_prescale(unsigned int channel, u16 prescale)  in samsung_timer_set_prescale()  argument
87 	if (channel >= 2)  in samsung_timer_set_prescale()
94 	reg |= (prescale - 1) << shift;  in samsung_timer_set_prescale()
100 static void samsung_timer_set_divisor(unsigned int channel, u8 divisor)  in samsung_timer_set_divisor()  argument
102 	u8 shift = TCFG1_SHIFT(channel);  in samsung_timer_set_divisor()
107 	bits = (fls(divisor) - 1) - pwm.variant.div_base;  in samsung_timer_set_divisor()
119 static void samsung_time_stop(unsigned int channel)  in samsung_time_stop()  argument
121 	unsigned long tcon;  in samsung_time_stop()  local
124 	if (channel > 0)  in samsung_time_stop()
125 		++channel;  in samsung_time_stop()
129 	tcon = readl_relaxed(pwm.base + REG_TCON);  in samsung_time_stop()
130 	tcon &= ~TCON_START(channel);  in samsung_time_stop()
131 	writel_relaxed(tcon, pwm.base + REG_TCON);  in samsung_time_stop()
136 static void samsung_time_setup(unsigned int channel, unsigned long tcnt)  in samsung_time_setup()  argument
138 	unsigned long tcon;  in samsung_time_setup()  local
140 	unsigned int tcon_chan = channel;  in samsung_time_setup()
147 	tcon = readl_relaxed(pwm.base + REG_TCON);  in samsung_time_setup()
149 	tcon &= ~(TCON_START(tcon_chan) | TCON_AUTORELOAD(tcon_chan));  in samsung_time_setup()
150 	tcon |= TCON_MANUALUPDATE(tcon_chan);  in samsung_time_setup()
152 	writel_relaxed(tcnt, pwm.base + REG_TCNTB(channel));  in samsung_time_setup()
153 	writel_relaxed(tcnt, pwm.base + REG_TCMPB(channel));  in samsung_time_setup()
154 	writel_relaxed(tcon, pwm.base + REG_TCON);  in samsung_time_setup()
159 static void samsung_time_start(unsigned int channel, bool periodic)  in samsung_time_start()  argument
161 	unsigned long tcon;  in samsung_time_start()  local
164 	if (channel > 0)  in samsung_time_start()
165 		++channel;  in samsung_time_start()
169 	tcon = readl_relaxed(pwm.base + REG_TCON);  in samsung_time_start()
171 	tcon &= ~TCON_MANUALUPDATE(channel);  in samsung_time_start()
172 	tcon |= TCON_START(channel);  in samsung_time_start()
175 		tcon |= TCON_AUTORELOAD(channel);  in samsung_time_start()
177 		tcon &= ~TCON_AUTORELOAD(channel);  in samsung_time_start()
179 	writel_relaxed(tcon, pwm.base + REG_TCON);  in samsung_time_start()
215 	samsung_time_setup(pwm.event_id, pwm.clock_count_per_tick - 1);  in samsung_set_periodic()
255 	evt->event_handler(evt);  in samsung_clock_event_isr()
362 	pwm.tcnt_max = (1UL << pwm.variant.bits) - 1;  in samsung_timer_resources()
378 	int channel;  in _samsung_pwm_clocksource_init()  local
380 	mask = ~pwm.variant.output_mask & ((1 << SAMSUNG_PWM_NUM) - 1);  in _samsung_pwm_clocksource_init()
381 	channel = fls(mask) - 1;  in _samsung_pwm_clocksource_init()
382 	if (channel < 0) {  in _samsung_pwm_clocksource_init()
383 		pr_crit("failed to find PWM channel for clocksource\n");  in _samsung_pwm_clocksource_init()
384 		return -EINVAL;  in _samsung_pwm_clocksource_init()
386 	pwm.source_id = channel;  in _samsung_pwm_clocksource_init()
388 	mask &= ~(1 << channel);  in _samsung_pwm_clocksource_init()
389 	channel = fls(mask) - 1;  in _samsung_pwm_clocksource_init()
390 	if (channel < 0) {  in _samsung_pwm_clocksource_init()
391 		pr_crit("failed to find PWM channel for clock event\n");  in _samsung_pwm_clocksource_init()
392 		return -EINVAL;  in _samsung_pwm_clocksource_init()
394 	pwm.event_id = channel;  in _samsung_pwm_clocksource_init()
428 	of_property_for_each_u32(np, "samsung,pwm-outputs", val) {  in samsung_pwm_alloc()
430 			pr_warn("%s: invalid channel index in samsung,pwm-outputs property\n", __func__);  in samsung_pwm_alloc()
439 		return -ENXIO;  in samsung_pwm_alloc()
476 TIMER_OF_DECLARE(s3c2410_pwm, "samsung,s3c2410-pwm", s3c2410_pwm_clocksource_init);
489 TIMER_OF_DECLARE(s3c6400_pwm, "samsung,s3c6400-pwm", s3c64xx_pwm_clocksource_init);
502 TIMER_OF_DECLARE(s5p6440_pwm, "samsung,s5p6440-pwm", s5p64x0_pwm_clocksource_init);
515 TIMER_OF_DECLARE(s5pc100_pwm, "samsung,s5pc100-pwm", s5p_pwm_clocksource_init);