arm/mach-omap1/timer32k.c

2  * linux/arch/arm/mach-omap1/timer32k.c
6  * Copyright (C) 2004 - 2005 Nokia Corporation
10  * OMAP Dual-mode timer framework support by Timo Teras
39 #include <linux/delay.h>
44 #include <linux/clk.h>
58  * ---------------------------------------------------------------------------
66  * ---------------------------------------------------------------------------
79  * TRM says 1 / HZ = ( TVR + 1) / 32768, so TRV = (32768 / HZ) - 1
82 #define OMAP_32K_TIMER_TICK_PERIOD	((OMAP_32K_TICKS_PER_SEC / HZ) - 1)
129 	.name			= "32k-timer",
144 	evt->event_handler(evt);  in omap_32k_timer_interrupt()
169  * higher resolution in free-running counter modes (e.g. 12 MHz xtal),
180 static cycles_t cycles;  variable
184  * omap_read_persistent_clock64 -  Return time from a persistent clock.
188  * 32k sync timer.  Convert the cycles elapsed since last read into
196 	last_cycles = cycles;  in omap_read_persistent_clock64()
197 	cycles = sync32k_cnt_reg ? readl_relaxed(sync32k_cnt_reg) : 0;  in omap_read_persistent_clock64()
199 	nsecs = clocksource_cyc2ns(cycles - last_cycles,  in omap_read_persistent_clock64()
208  * omap_init_clocksource_32k - setup and register counter 32k as a
222 	 * The 'SCHEME' bits(30-31) of the revision register is used  in omap_init_clocksource_32k()
253  * ---------------------------------------------------------------------------
255  * ---------------------------------------------------------------------------
259 	int ret = -ENODEV;  in omap_32k_timer_init()
263 		struct clk *sync32k_ick;  in omap_32k_timer_init()
268 			return -ENODEV;  in omap_32k_timer_init()