Commit | Line | Data |
---|---|---|
1802d0be | 1 | // SPDX-License-Identifier: GPL-2.0-only |
220e2a8d | 2 | /* |
220e2a8d PM |
3 | * |
4 | * Copyright (C) 2014 ARM Limited | |
5 | */ | |
6 | ||
7 | #include <linux/clocksource.h> | |
8 | #include <linux/io.h> | |
9 | #include <linux/of_address.h> | |
10 | #include <linux/sched_clock.h> | |
11 | ||
12 | #define SYS_24MHZ 0x05c | |
13 | ||
14 | static void __iomem *versatile_sys_24mhz; | |
15 | ||
1605abff | 16 | static u64 notrace versatile_sys_24mhz_read(void) |
220e2a8d PM |
17 | { |
18 | return readl(versatile_sys_24mhz); | |
19 | } | |
20 | ||
86de9628 | 21 | static int __init versatile_sched_clock_init(struct device_node *node) |
220e2a8d PM |
22 | { |
23 | void __iomem *base = of_iomap(node, 0); | |
24 | ||
25 | if (!base) | |
86de9628 | 26 | return -ENXIO; |
220e2a8d PM |
27 | |
28 | versatile_sys_24mhz = base + SYS_24MHZ; | |
29 | ||
1605abff | 30 | sched_clock_register(versatile_sys_24mhz_read, 32, 24000000); |
86de9628 DL |
31 | |
32 | return 0; | |
220e2a8d | 33 | } |
17273395 | 34 | TIMER_OF_DECLARE(vexpress, "arm,vexpress-sysreg", |
f2fa0299 | 35 | versatile_sched_clock_init); |
17273395 | 36 | TIMER_OF_DECLARE(versatile, "arm,versatile-sysreg", |
1605abff | 37 | versatile_sched_clock_init); |