mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-15 23:14:31 +08:00
439a36d7d9
We have the following file --> Kconfig mapping: sunxi/clk-factors.c obj-y sunxi/clk-sun6i-apb0-gates.c CONFIG_MFD_SUN6I_PRCM (bool) sunxi/clk-sun6i-apb0.c CONFIG_MFD_SUN6I_PRCM sunxi/clk-sun6i-ar100.c CONFIG_MFD_SUN6I_PRCM sunxi/clk-sun8i-apb0.c CONFIG_MFD_SUN6I_PRCM sunxi/clk-sun9i-mmc.c obj-y Hence none of these are being built as a module by anyone. Lets remove the modular code that is essentially orphaned, so that when reading the drivers there is no doubt they are builtin-only. All drivers get mostly the same changes, so they are handled in batch. Changes are (1) convert to builtin_platform_register, (2) use the init.h header, (3) delete the MODULE_LICENCE/MODULE_AUTHOR and associated tags, and (4) delete any ".remove" functions. There was a stray module.h in a file not using any init.h or module.h stuff, so we simply removed that one. In two cases, we explicitly disallow a driver unbind, since that doesn't have a sensible use case anyway, and it allows us to drop the ".remove" code for non-modular drivers. Since module_platform_driver() uses the same init level priority as builtin_platform_driver() the init ordering remains unchanged with this commit. We delete the MODULE_LICENSE etc. tags since all that information is already contained at the top of each file in the comments. Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com> Cc: Chen-Yu Tsai <wens@csie.org> Cc: "Emilio López" <emilio@elopez.com.ar> Cc: Stephen Boyd <sboyd@codeaurora.org> Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com> Cc: linux-clk@vger.kernel.org Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Signed-off-by: Michael Turquette <mturquette@baylibre.com> Link: lkml.kernel.org/r/20160704211220.5685-9-paul.gortmaker@windriver.com
108 lines
2.2 KiB
C
108 lines
2.2 KiB
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/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);
|