9dfefe8c76
This clock provider uses the consumer API, so include clk.h explicitly. Also remove clkdev.h in files that aren't using it and include slab.h when clkdev.h was being used to implicitly include it. Cc: Chen-Yu Tsai <wens@csie.org> Cc: Maxime Ripard <maxime.ripard@free-electrons.com> Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
89 lines
2.1 KiB
C
89 lines
2.1 KiB
C
/*
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* Copyright 2014 Chen-Yu Tsai
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*
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* Chen-Yu Tsai <wens@csie.org>
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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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* 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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#include <linux/clk.h>
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#include <linux/clk-provider.h>
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#include <linux/of_address.h>
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#include "clk-factors.h"
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/**
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* sun8i_a23_get_mbus_factors() - calculates m factor for MBUS clocks
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* MBUS rate is calculated as follows
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* rate = parent_rate / (m + 1);
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*/
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static void sun8i_a23_get_mbus_factors(u32 *freq, u32 parent_rate,
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u8 *n, u8 *k, u8 *m, u8 *p)
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{
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u8 div;
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/*
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* These clocks can only divide, so we will never be able to
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* achieve frequencies higher than the parent frequency
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*/
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if (*freq > parent_rate)
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*freq = parent_rate;
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div = DIV_ROUND_UP(parent_rate, *freq);
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if (div > 8)
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div = 8;
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*freq = parent_rate / div;
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/* we were called to round the frequency, we can now return */
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if (m == NULL)
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return;
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*m = div - 1;
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}
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static struct clk_factors_config sun8i_a23_mbus_config = {
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.mshift = 0,
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.mwidth = 3,
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};
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static const struct factors_data sun8i_a23_mbus_data __initconst = {
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.enable = 31,
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.mux = 24,
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.muxmask = BIT(1) | BIT(0),
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.table = &sun8i_a23_mbus_config,
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.getter = sun8i_a23_get_mbus_factors,
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};
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static DEFINE_SPINLOCK(sun8i_a23_mbus_lock);
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static void __init sun8i_a23_mbus_setup(struct device_node *node)
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{
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struct clk *mbus;
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void __iomem *reg;
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reg = of_iomap(node, 0);
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if (!reg) {
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pr_err("Could not get registers for a23-mbus-clk\n");
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return;
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}
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mbus = sunxi_factors_register(node, &sun8i_a23_mbus_data,
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&sun8i_a23_mbus_lock, reg);
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/* The MBUS clocks needs to be always enabled */
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__clk_get(mbus);
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clk_prepare_enable(mbus);
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}
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CLK_OF_DECLARE(sun8i_a23_mbus, "allwinner,sun8i-a23-mbus-clk", sun8i_a23_mbus_setup);
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