112 lines
2.5 KiB
C
112 lines
2.5 KiB
C
/*
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* drivers/clk/at91/clk-slow.c
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*
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* Copyright (C) 2013 Boris BREZILLON <b.brezillon@overkiz.com>
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*
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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*/
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#include <linux/clk-provider.h>
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#include <linux/clkdev.h>
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#include <linux/clk/at91_pmc.h>
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#include <linux/of.h>
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#include <linux/mfd/syscon.h>
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#include <linux/regmap.h>
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#include "pmc.h"
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struct clk_sam9260_slow {
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struct clk_hw hw;
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struct regmap *regmap;
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};
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#define to_clk_sam9260_slow(hw) container_of(hw, struct clk_sam9260_slow, hw)
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static u8 clk_sam9260_slow_get_parent(struct clk_hw *hw)
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{
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struct clk_sam9260_slow *slowck = to_clk_sam9260_slow(hw);
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unsigned int status;
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regmap_read(slowck->regmap, AT91_PMC_SR, &status);
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return status & AT91_PMC_OSCSEL ? 1 : 0;
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}
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static const struct clk_ops sam9260_slow_ops = {
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.get_parent = clk_sam9260_slow_get_parent,
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};
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static struct clk_hw * __init
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at91_clk_register_sam9260_slow(struct regmap *regmap,
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const char *name,
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const char **parent_names,
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int num_parents)
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{
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struct clk_sam9260_slow *slowck;
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struct clk_hw *hw;
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struct clk_init_data init = {};
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int ret;
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if (!name)
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return ERR_PTR(-EINVAL);
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if (!parent_names || !num_parents)
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return ERR_PTR(-EINVAL);
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slowck = kzalloc(sizeof(*slowck), GFP_KERNEL);
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if (!slowck)
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return ERR_PTR(-ENOMEM);
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init.name = name;
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init.ops = &sam9260_slow_ops;
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init.parent_names = parent_names;
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init.num_parents = num_parents;
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init.flags = 0;
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slowck->hw.init = &init;
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slowck->regmap = regmap;
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hw = &slowck->hw;
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ret = clk_hw_register(NULL, &slowck->hw);
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if (ret) {
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kfree(slowck);
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hw = ERR_PTR(ret);
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}
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return hw;
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}
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static void __init of_at91sam9260_clk_slow_setup(struct device_node *np)
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{
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struct clk_hw *hw;
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const char *parent_names[2];
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unsigned int num_parents;
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const char *name = np->name;
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struct regmap *regmap;
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num_parents = of_clk_get_parent_count(np);
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if (num_parents != 2)
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return;
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of_clk_parent_fill(np, parent_names, num_parents);
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regmap = syscon_node_to_regmap(of_get_parent(np));
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if (IS_ERR(regmap))
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return;
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of_property_read_string(np, "clock-output-names", &name);
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hw = at91_clk_register_sam9260_slow(regmap, name, parent_names,
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num_parents);
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if (IS_ERR(hw))
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return;
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of_clk_add_hw_provider(np, of_clk_hw_simple_get, hw);
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}
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CLK_OF_DECLARE(at91sam9260_clk_slow, "atmel,at91sam9260-clk-slow",
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of_at91sam9260_clk_slow_setup);
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