2  * Renesas Timer Support - OSTM
27  * The OSTM contains independent channels.
28  * The first OSTM channel probed will be set up as a free running
44 /* OSTM REGISTERS */
64 static void ostm_timer_stop(struct ostm_device *ostm)  in ostm_timer_stop()  argument
66 	if (readb(ostm->base + OSTM_TE) & TE) {  in ostm_timer_stop()
67 		writeb(TT, ostm->base + OSTM_TT);  in ostm_timer_stop()
74 		while (readb(ostm->base + OSTM_TE) & TE)  in ostm_timer_stop()
79 static int __init ostm_init_clksrc(struct ostm_device *ostm, unsigned long rate)  in ostm_init_clksrc()  argument
85 	ostm_timer_stop(ostm);  in ostm_init_clksrc()
87 	writel(0, ostm->base + OSTM_CMP);  in ostm_init_clksrc()
88 	writeb(CTL_FREERUN, ostm->base + OSTM_CTL);  in ostm_init_clksrc()
89 	writeb(TS, ostm->base + OSTM_TS);  in ostm_init_clksrc()
91 	return clocksource_mmio_init(ostm->base + OSTM_CNT,  in ostm_init_clksrc()
92 			"ostm", rate,  in ostm_init_clksrc()
101 static void __init ostm_init_sched_clock(struct ostm_device *ostm,  in ostm_init_sched_clock()  argument
104 	system_clock = ostm->base + OSTM_CNT;  in ostm_init_sched_clock()
111 	struct ostm_device *ostm = ced_to_ostm(ced);  in ostm_clock_event_next()  local
113 	ostm_timer_stop(ostm);  in ostm_clock_event_next()
115 	writel(delta, ostm->base + OSTM_CMP);  in ostm_clock_event_next()
116 	writeb(CTL_ONESHOT, ostm->base + OSTM_CTL);  in ostm_clock_event_next()
117 	writeb(TS, ostm->base + OSTM_TS);  in ostm_clock_event_next()
124 	struct ostm_device *ostm = ced_to_ostm(ced);  in ostm_shutdown()  local
126 	ostm_timer_stop(ostm);  in ostm_shutdown()
132 	struct ostm_device *ostm = ced_to_ostm(ced);  in ostm_set_periodic()  local
135 		ostm_timer_stop(ostm);  in ostm_set_periodic()
137 	writel(ostm->ticks_per_jiffy - 1, ostm->base + OSTM_CMP);  in ostm_set_periodic()
138 	writeb(CTL_PERIODIC, ostm->base + OSTM_CTL);  in ostm_set_periodic()
139 	writeb(TS, ostm->base + OSTM_TS);  in ostm_set_periodic()
146 	struct ostm_device *ostm = ced_to_ostm(ced);  in ostm_set_oneshot()  local
148 	ostm_timer_stop(ostm);  in ostm_set_oneshot()
155 	struct ostm_device *ostm = dev_id;  in ostm_timer_interrupt()  local
157 	if (clockevent_state_oneshot(&ostm->ced))  in ostm_timer_interrupt()
158 		ostm_timer_stop(ostm);  in ostm_timer_interrupt()
161 	if (ostm->ced.event_handler)  in ostm_timer_interrupt()
162 		ostm->ced.event_handler(&ostm->ced);  in ostm_timer_interrupt()
167 static int __init ostm_init_clkevt(struct ostm_device *ostm, int irq,  in ostm_init_clkevt()  argument
170 	struct clock_event_device *ced = &ostm->ced;  in ostm_init_clkevt()
175 			  "ostm", ostm);  in ostm_init_clkevt()
177 		pr_err("ostm: failed to request irq\n");  in ostm_init_clkevt()
181 	ced->name = "ostm";  in ostm_init_clkevt()
197 	struct ostm_device *ostm;  in ostm_init()  local
203 	ostm = kzalloc(sizeof(*ostm), GFP_KERNEL);  in ostm_init()
204 	if (!ostm)  in ostm_init()
207 	ostm->base = of_iomap(np, 0);  in ostm_init()
208 	if (!ostm->base) {  in ostm_init()
209 		pr_err("ostm: failed to remap I/O memory\n");  in ostm_init()
215 		pr_err("ostm: Failed to get irq\n");  in ostm_init()
221 		pr_err("ostm: Failed to get clock\n");  in ostm_init()
228 		pr_err("ostm: Failed to enable clock\n");  in ostm_init()
233 	ostm->ticks_per_jiffy = (rate + HZ / 2) / HZ;  in ostm_init()
240 		ret = ostm_init_clksrc(ostm, rate);  in ostm_init()
243 			ostm_init_sched_clock(ostm, rate);  in ostm_init()
244 			pr_info("ostm: used for clocksource\n");  in ostm_init()
248 		ret = ostm_init_clkevt(ostm, irq, rate);  in ostm_init()
251 			pr_info("ostm: used for clock events\n");  in ostm_init()
257 		iounmap(ostm->base);  in ostm_init()
258 		kfree(ostm);  in ostm_init()
265 TIMER_OF_DECLARE(ostm, "renesas,ostm", ostm_init);