mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-24 15:20:58 +07:00
0376148f30
Based on 1 normalized pattern(s): license terms gnu general public license v2 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 37 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Steve Winslow <swinslow@gmail.com> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190528170027.724130665@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
107 lines
2.2 KiB
C
107 lines
2.2 KiB
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;
|
|
struct resource *r;
|
|
void __iomem *reg;
|
|
struct clk *clk;
|
|
|
|
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
reg = devm_ioremap_resource(&pdev->dev, r);
|
|
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);
|