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: 3d7cb6b04c3f3115719235cc6866b10326de34cd authored by Linus Torvalds on 31 July 2022, 21:03:01 UTC
Linux 5.19
Linux 5.19
Tip revision: 3d7cb6b
clk-sun6i-ar100.c
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2014 Free Electrons
*
* Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
*
* Allwinner A31 AR100 clock driver
*/
#include <linux/bitops.h>
#include <linux/clk-provider.h>
#include <linux/init.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/spinlock.h>
#include "clk-factors.h"
/*
* sun6i_get_ar100_factors - Calculates factors p, m for AR100
*
* AR100 rate is calculated as follows
* rate = (parent_rate >> p) / (m + 1);
*/
static void sun6i_get_ar100_factors(struct factors_request *req)
{
unsigned long div;
int shift;
/* clock only divides */
if (req->rate > req->parent_rate)
req->rate = req->parent_rate;
div = DIV_ROUND_UP(req->parent_rate, req->rate);
if (div < 32)
shift = 0;
else if (div >> 1 < 32)
shift = 1;
else if (div >> 2 < 32)
shift = 2;
else
shift = 3;
div >>= shift;
if (div > 32)
div = 32;
req->rate = (req->parent_rate >> shift) / div;
req->m = div - 1;
req->p = shift;
}
static const struct clk_factors_config sun6i_ar100_config = {
.mwidth = 5,
.mshift = 8,
.pwidth = 2,
.pshift = 4,
};
static const struct factors_data sun6i_ar100_data = {
.mux = 16,
.muxmask = GENMASK(1, 0),
.table = &sun6i_ar100_config,
.getter = sun6i_get_ar100_factors,
};
static DEFINE_SPINLOCK(sun6i_ar100_lock);
static int sun6i_a31_ar100_clk_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
void __iomem *reg;
struct clk *clk;
reg = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(reg))
return PTR_ERR(reg);
clk = sunxi_factors_register(np, &sun6i_ar100_data, &sun6i_ar100_lock,
reg);
if (!clk)
return -ENOMEM;
platform_set_drvdata(pdev, clk);
return 0;
}
static const struct of_device_id sun6i_a31_ar100_clk_dt_ids[] = {
{ .compatible = "allwinner,sun6i-a31-ar100-clk" },
{ /* sentinel */ }
};
static struct platform_driver sun6i_a31_ar100_clk_driver = {
.driver = {
.name = "sun6i-a31-ar100-clk",
.of_match_table = sun6i_a31_ar100_clk_dt_ids,
.suppress_bind_attrs = true,
},
.probe = sun6i_a31_ar100_clk_probe,
};
builtin_platform_driver(sun6i_a31_ar100_clk_driver);