62 lines
1.4 KiB
C
62 lines
1.4 KiB
C
/*
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* Copyright (C) 2013 Alexander Shiyan <shc_work@mail.ru>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*/
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#include <common.h>
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#include <clock.h>
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#include <io.h>
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#include <init.h>
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#include <linux/clk.h>
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#include <linux/err.h>
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static __iomem void *clps711x_timer_base;
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static uint64_t clps711x_cs_read(void)
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{
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return ~readw(clps711x_timer_base);
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}
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static struct clocksource clps711x_cs = {
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.read = clps711x_cs_read,
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.mask = CLOCKSOURCE_MASK(16),
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};
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static int clps711x_cs_probe(struct device_d *dev)
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{
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u32 rate;
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struct clk *timer_clk;
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timer_clk = clk_get(dev, NULL);
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if (IS_ERR(timer_clk))
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return PTR_ERR(timer_clk);
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rate = clk_get_rate(timer_clk);
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clps711x_timer_base = dev_request_mem_region(dev, 0);
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if (!clps711x_timer_base) {
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clk_put(timer_clk);
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return -ENOENT;
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}
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clocks_calc_mult_shift(&clps711x_cs.mult, &clps711x_cs.shift, rate,
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NSEC_PER_SEC, 10);
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return init_clock(&clps711x_cs);
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}
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static struct driver_d clps711x_cs_driver = {
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.name = "clps711x-cs",
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.probe = clps711x_cs_probe,
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};
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static __init int clps711x_cs_init(void)
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{
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return platform_driver_register(&clps711x_cs_driver);
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}
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coredevice_initcall(clps711x_cs_init);
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