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42 lines
1.2 KiB
42 lines
1.2 KiB
/* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License version 2 as |
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* published by the Free Software Foundation. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* Copyright (C) 2014 ARM Limited |
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*/ |
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#include <linux/clocksource.h> |
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#include <linux/io.h> |
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#include <linux/of_address.h> |
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#include <linux/sched_clock.h> |
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#define SYS_24MHZ 0x05c |
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static void __iomem *versatile_sys_24mhz; |
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static u64 notrace versatile_sys_24mhz_read(void) |
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{ |
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return readl(versatile_sys_24mhz); |
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} |
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static void __init versatile_sched_clock_init(struct device_node *node) |
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{ |
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void __iomem *base = of_iomap(node, 0); |
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if (!base) |
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return; |
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versatile_sys_24mhz = base + SYS_24MHZ; |
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sched_clock_register(versatile_sys_24mhz_read, 32, 24000000); |
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} |
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CLOCKSOURCE_OF_DECLARE(vexpress, "arm,vexpress-sysreg", |
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versatile_sched_clock_init); |
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CLOCKSOURCE_OF_DECLARE(versatile, "arm,versatile-sysreg", |
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versatile_sched_clock_init);
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