78 	struct pit_data *data = clksrc_to_pit_data(cs);  in read_pit_clk()  local
84 	elapsed = data->cnt;  in read_pit_clk()
85 	t = pit_read(data->base, AT91_PIT_PIIR);  in read_pit_clk()
88 	elapsed += PIT_PICNT(t) * data->cycle;  in read_pit_clk()
95 	struct pit_data *data = clkevt_to_pit_data(dev);  in pit_clkevt_shutdown()  local
98 	pit_write(data->base, AT91_PIT_MR, (data->cycle - 1) | AT91_PIT_PITEN);  in pit_clkevt_shutdown()
107 	struct pit_data *data = clkevt_to_pit_data(dev);  in pit_clkevt_set_periodic()  local
110 	data->cnt += data->cycle * PIT_PICNT(pit_read(data->base, AT91_PIT_PIVR));  in pit_clkevt_set_periodic()
111 	pit_write(data->base, AT91_PIT_MR,  in pit_clkevt_set_periodic()
112 		  (data->cycle - 1) | AT91_PIT_PITEN | AT91_PIT_PITIEN);  in pit_clkevt_set_periodic()
118 	struct pit_data *data = clkevt_to_pit_data(cedev);  in at91sam926x_pit_suspend()  local
121 	pit_write(data->base, AT91_PIT_MR, 0);  in at91sam926x_pit_suspend()
124 static void at91sam926x_pit_reset(struct pit_data *data)  in at91sam926x_pit_reset()  argument
127 	pit_write(data->base, AT91_PIT_MR, 0);  in at91sam926x_pit_reset()
130 	while (PIT_CPIV(pit_read(data->base, AT91_PIT_PIVR)) != 0)  in at91sam926x_pit_reset()
134 	pit_write(data->base, AT91_PIT_MR,  in at91sam926x_pit_reset()
135 		  (data->cycle - 1) | AT91_PIT_PITEN);  in at91sam926x_pit_reset()
140 	struct pit_data *data = clkevt_to_pit_data(cedev);  in at91sam926x_pit_resume()  local
142 	at91sam926x_pit_reset(data);  in at91sam926x_pit_resume()
150 	struct pit_data *data = dev_id;  in at91sam926x_pit_interrupt()  local
159 	if (clockevent_state_periodic(&data->clkevt) &&  in at91sam926x_pit_interrupt()
160 	    (pit_read(data->base, AT91_PIT_SR) & AT91_PIT_PITS)) {  in at91sam926x_pit_interrupt()
164 		nr_ticks = PIT_PICNT(pit_read(data->base, AT91_PIT_PIVR));  in at91sam926x_pit_interrupt()
166 			data->cnt += data->cycle;  in at91sam926x_pit_interrupt()
167 			data->clkevt.event_handler(&data->clkevt);  in at91sam926x_pit_interrupt()
180 static void __init at91sam926x_pit_common_init(struct pit_data *data)  in at91sam926x_pit_common_init()  argument
190 	pit_rate = clk_get_rate(data->mck) / 16;  in at91sam926x_pit_common_init()
191 	data->cycle = DIV_ROUND_CLOSEST(pit_rate, HZ);  in at91sam926x_pit_common_init()
192 	WARN_ON(((data->cycle - 1) & ~AT91_PIT_PIV) != 0);  in at91sam926x_pit_common_init()
195 	at91sam926x_pit_reset(data);  in at91sam926x_pit_common_init()
201 	bits = 12 /* PICNT */ + ilog2(data->cycle) /* PIV */;  in at91sam926x_pit_common_init()
202 	data->clksrc.mask = CLOCKSOURCE_MASK(bits);  in at91sam926x_pit_common_init()
203 	data->clksrc.name = "pit";  in at91sam926x_pit_common_init()
204 	data->clksrc.rating = 175;  in at91sam926x_pit_common_init()
205 	data->clksrc.read = read_pit_clk;  in at91sam926x_pit_common_init()
206 	data->clksrc.flags = CLOCK_SOURCE_IS_CONTINUOUS;  in at91sam926x_pit_common_init()
207 	clocksource_register_hz(&data->clksrc, pit_rate);  in at91sam926x_pit_common_init()
210 	ret = request_irq(data->irq, at91sam926x_pit_interrupt,  in at91sam926x_pit_common_init()
212 			  "at91_tick", data);  in at91sam926x_pit_common_init()
217 	data->clkevt.name = "pit";  in at91sam926x_pit_common_init()
218 	data->clkevt.features = CLOCK_EVT_FEAT_PERIODIC;  in at91sam926x_pit_common_init()
219 	data->clkevt.shift = 32;  in at91sam926x_pit_common_init()
220 	data->clkevt.mult = div_sc(pit_rate, NSEC_PER_SEC, data->clkevt.shift);  in at91sam926x_pit_common_init()
221 	data->clkevt.rating = 100;  in at91sam926x_pit_common_init()
222 	data->clkevt.cpumask = cpumask_of(0);  in at91sam926x_pit_common_init()
224 	data->clkevt.set_state_shutdown = pit_clkevt_shutdown;  in at91sam926x_pit_common_init()
225 	data->clkevt.set_state_periodic = pit_clkevt_set_periodic;  in at91sam926x_pit_common_init()
226 	data->clkevt.resume = at91sam926x_pit_resume;  in at91sam926x_pit_common_init()
227 	data->clkevt.suspend = at91sam926x_pit_suspend;  in at91sam926x_pit_common_init()
228 	clockevents_register_device(&data->clkevt);  in at91sam926x_pit_common_init()
233 	struct pit_data *data;  in at91sam926x_pit_dt_init()  local
235 	data = kzalloc(sizeof(*data), GFP_KERNEL);  in at91sam926x_pit_dt_init()
236 	if (!data)  in at91sam926x_pit_dt_init()
239 	data->base = of_iomap(node, 0);  in at91sam926x_pit_dt_init()
240 	if (!data->base)  in at91sam926x_pit_dt_init()
243 	data->mck = of_clk_get(node, 0);  in at91sam926x_pit_dt_init()
244 	if (IS_ERR(data->mck))  in at91sam926x_pit_dt_init()
246 		data->mck = clk_get(NULL, "mck");  in at91sam926x_pit_dt_init()
248 	if (IS_ERR(data->mck))  in at91sam926x_pit_dt_init()
252 	data->irq = irq_of_parse_and_map(node, 0);  in at91sam926x_pit_dt_init()
253 	if (!data->irq)  in at91sam926x_pit_dt_init()
256 	at91sam926x_pit_common_init(data);  in at91sam926x_pit_dt_init()