https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: b562e44f507e863c6792946e4e1b1449fbbac85d authored by Linus Torvalds on 14 March 2016, 04:28:54 UTC
Linux 4.5
Linux 4.5
Tip revision: b562e44
clk-sun8i-mbus.c
/*
* Copyright 2014 Chen-Yu Tsai
*
* Chen-Yu Tsai <wens@csie.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/of_address.h>
#include "clk-factors.h"
/**
* sun8i_a23_get_mbus_factors() - calculates m factor for MBUS clocks
* MBUS rate is calculated as follows
* rate = parent_rate / (m + 1);
*/
static void sun8i_a23_get_mbus_factors(u32 *freq, u32 parent_rate,
u8 *n, u8 *k, u8 *m, u8 *p)
{
u8 div;
/*
* These clocks can only divide, so we will never be able to
* achieve frequencies higher than the parent frequency
*/
if (*freq > parent_rate)
*freq = parent_rate;
div = DIV_ROUND_UP(parent_rate, *freq);
if (div > 8)
div = 8;
*freq = parent_rate / div;
/* we were called to round the frequency, we can now return */
if (m == NULL)
return;
*m = div - 1;
}
static struct clk_factors_config sun8i_a23_mbus_config = {
.mshift = 0,
.mwidth = 3,
};
static const struct factors_data sun8i_a23_mbus_data __initconst = {
.enable = 31,
.mux = 24,
.muxmask = BIT(1) | BIT(0),
.table = &sun8i_a23_mbus_config,
.getter = sun8i_a23_get_mbus_factors,
};
static DEFINE_SPINLOCK(sun8i_a23_mbus_lock);
static void __init sun8i_a23_mbus_setup(struct device_node *node)
{
struct clk *mbus;
void __iomem *reg;
reg = of_iomap(node, 0);
if (!reg) {
pr_err("Could not get registers for a23-mbus-clk\n");
return;
}
mbus = sunxi_factors_register(node, &sun8i_a23_mbus_data,
&sun8i_a23_mbus_lock, reg);
/* The MBUS clocks needs to be always enabled */
__clk_get(mbus);
clk_prepare_enable(mbus);
}
CLK_OF_DECLARE(sun8i_a23_mbus, "allwinner,sun8i-a23-mbus-clk", sun8i_a23_mbus_setup);