drivers/clocksource/asm9260_timer.c

1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * Copyright (C) 2014 Oleksij Rempel <linux@rempel-privat.de>
10 #include <linux/clk.h>
19 #define DRIVER_NAME	"asm9260-timer"
23  * 0x0 - plain read write mode
24  * 0x4 - set mode, OR logic.
25  * 0x8 - clr mode, XOR logic.
26  * 0xc - togle mode.
48  * 1 - Timer Counter and Prescale Counter are enabled for counting
49  * 0 - counters are disabled */
56 /* 00 - count up
57  * 01 - count down
58  * 10 - ?? 2^n/2 */
171 	evt->event_handler(evt);  in asm9260_timer_interrupt()
179  * ---------------------------------------------------------------------------
181  * ---------------------------------------------------------------------------
186 	struct clk *clk;  in asm9260_timer_init()  local
188 	unsigned long rate;  in asm9260_timer_init()  local
190 	priv.base = of_io_request_and_map(np, 0, np->name);  in asm9260_timer_init()
196 	clk = of_clk_get(np, 0);  in asm9260_timer_init()
197 	if (IS_ERR(clk)) {  in asm9260_timer_init()
198 		pr_err("Failed to get clk!\n");  in asm9260_timer_init()
199 		return PTR_ERR(clk);  in asm9260_timer_init()
202 	ret = clk_prepare_enable(clk);  in asm9260_timer_init()
204 		pr_err("Failed to enable clk!\n");  in asm9260_timer_init()
216 	/* set all timers for count-up */  in asm9260_timer_init()
225 	rate = clk_get_rate(clk);  in asm9260_timer_init()
226 	clocksource_mmio_init(priv.base + HW_TC1, DRIVER_NAME, rate,  in asm9260_timer_init()
230 	 * actions for MR are disabled. So, set MR to max value. */  in asm9260_timer_init()
235 	priv.ticks_per_jiffy = DIV_ROUND_CLOSEST(rate, HZ);  in asm9260_timer_init()
237 	clockevents_config_and_register(&event_dev, rate, 0x2c00, 0xfffffffe);  in asm9260_timer_init()
241 TIMER_OF_DECLARE(asm9260_timer, "alphascale,asm9260-timer",