Release 4.7 drivers/clk/sunxi/clk-sun6i-ar100.c
/*
* Copyright (C) 2014 Free Electrons
*
* License Terms: GNU General Public License v2
* Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
*
* Allwinner A31 AR100 clock driver
*
*/
#include <linux/bitops.h>
#include <linux/clk-provider.h>
#include <linux/module.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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| chen-yu tsai | chen-yu tsai | 67 | 50.38% | 1 | 25.00% |
| boris brezillon | boris brezillon | 66 | 49.62% | 3 | 75.00% |
| Total | 133 | 100.00% | 4 | 100.00% |
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| boris brezillon | boris brezillon | 80 | 74.77% | 1 | 50.00% |
| chen-yu tsai | chen-yu tsai | 27 | 25.23% | 1 | 50.00% |
| Total | 107 | 100.00% | 2 | 100.00% |
static int sun6i_a31_ar100_clk_remove(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct clk *clk = platform_get_drvdata(pdev);
sunxi_factors_unregister(np, clk);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| chen-yu tsai | chen-yu tsai | 29 | 69.05% | 1 | 50.00% |
| boris brezillon | boris brezillon | 13 | 30.95% | 1 | 50.00% |
| Total | 42 | 100.00% | 2 | 100.00% |
static const struct of_device_id sun6i_a31_ar100_clk_dt_ids[] = {
{ .compatible = "allwinner,sun6i-a31-ar100-clk" },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, sun6i_a31_ar100_clk_dt_ids);
static struct platform_driver sun6i_a31_ar100_clk_driver = {
.driver = {
.name = "sun6i-a31-ar100-clk",
.of_match_table = sun6i_a31_ar100_clk_dt_ids,
},
.probe = sun6i_a31_ar100_clk_probe,
.remove = sun6i_a31_ar100_clk_remove,
};
module_platform_driver(sun6i_a31_ar100_clk_driver);
MODULE_AUTHOR("Boris BREZILLON <boris.brezillon@free-electrons.com>");
MODULE_DESCRIPTION("Allwinner A31 AR100 clock Driver");
MODULE_LICENSE("GPL v2");
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| boris brezillon | boris brezillon | 257 | 56.86% | 3 | 50.00% |
| chen-yu tsai | chen-yu tsai | 186 | 41.15% | 1 | 16.67% |
| luis de bethencourt | luis de bethencourt | 7 | 1.55% | 1 | 16.67% |
| emilio lopez | emilio lopez | 2 | 0.44% | 1 | 16.67% |
| arnd bergmann | arnd bergmann | | 0.00% | 0 | 0.00% |
| Total | 452 | 100.00% | 6 | 100.00% |
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