mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-26 04:53:42 +00:00
61b29b8268
At present devres.h is included in all files that include dm.h but few make use of it. Also this pulls in linux/compat which adds several more headers. Drop the automatic inclusion and require files to include devres themselves. This provides a good indication of which files use devres. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Anatolij Gustschin <agust@denx.de>
114 lines
2.4 KiB
C
114 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Copyright (C) 2019 DENX Software Engineering
|
|
* Lukasz Majewski, DENX Software Engineering, lukma@denx.de
|
|
*
|
|
* Copyright 2012 Freescale Semiconductor, Inc.
|
|
* Copyright 2012 Linaro Ltd.
|
|
*
|
|
* The code contained herein is licensed under the GNU General Public
|
|
* License. You may obtain a copy of the GNU General Public License
|
|
* Version 2 or later at the following locations:
|
|
*
|
|
* http://www.opensource.org/licenses/gpl-license.html
|
|
* http://www.gnu.org/copyleft/gpl.html
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <asm/io.h>
|
|
#include <malloc.h>
|
|
#include <clk-uclass.h>
|
|
#include <dm/device.h>
|
|
#include <dm/devres.h>
|
|
#include <linux/clk-provider.h>
|
|
#include <div64.h>
|
|
#include <clk.h>
|
|
#include "clk.h"
|
|
#include <linux/err.h>
|
|
|
|
#define UBOOT_DM_CLK_IMX_PFD "imx_clk_pfd"
|
|
|
|
struct clk_pfd {
|
|
struct clk clk;
|
|
void __iomem *reg;
|
|
u8 idx;
|
|
};
|
|
|
|
#define to_clk_pfd(_clk) container_of(_clk, struct clk_pfd, clk)
|
|
|
|
#define SET 0x4
|
|
#define CLR 0x8
|
|
#define OTG 0xc
|
|
|
|
static unsigned long clk_pfd_recalc_rate(struct clk *clk)
|
|
{
|
|
struct clk_pfd *pfd =
|
|
to_clk_pfd(dev_get_clk_ptr(clk->dev));
|
|
unsigned long parent_rate = clk_get_parent_rate(clk);
|
|
u64 tmp = parent_rate;
|
|
u8 frac = (readl(pfd->reg) >> (pfd->idx * 8)) & 0x3f;
|
|
|
|
tmp *= 18;
|
|
do_div(tmp, frac);
|
|
|
|
return tmp;
|
|
}
|
|
|
|
static unsigned long clk_pfd_set_rate(struct clk *clk, unsigned long rate)
|
|
{
|
|
struct clk_pfd *pfd = to_clk_pfd(clk);
|
|
unsigned long parent_rate = clk_get_parent_rate(clk);
|
|
u64 tmp = parent_rate;
|
|
u8 frac;
|
|
|
|
tmp = tmp * 18 + rate / 2;
|
|
do_div(tmp, rate);
|
|
frac = tmp;
|
|
if (frac < 12)
|
|
frac = 12;
|
|
else if (frac > 35)
|
|
frac = 35;
|
|
|
|
writel(0x3f << (pfd->idx * 8), pfd->reg + CLR);
|
|
writel(frac << (pfd->idx * 8), pfd->reg + SET);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct clk_ops clk_pfd_ops = {
|
|
.get_rate = clk_pfd_recalc_rate,
|
|
.set_rate = clk_pfd_set_rate,
|
|
};
|
|
|
|
struct clk *imx_clk_pfd(const char *name, const char *parent_name,
|
|
void __iomem *reg, u8 idx)
|
|
{
|
|
struct clk_pfd *pfd;
|
|
struct clk *clk;
|
|
int ret;
|
|
|
|
pfd = kzalloc(sizeof(*pfd), GFP_KERNEL);
|
|
if (!pfd)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
pfd->reg = reg;
|
|
pfd->idx = idx;
|
|
|
|
/* register the clock */
|
|
clk = &pfd->clk;
|
|
|
|
ret = clk_register(clk, UBOOT_DM_CLK_IMX_PFD, name, parent_name);
|
|
if (ret) {
|
|
kfree(pfd);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
return clk;
|
|
}
|
|
|
|
U_BOOT_DRIVER(clk_pfd) = {
|
|
.name = UBOOT_DM_CLK_IMX_PFD,
|
|
.id = UCLASS_CLK,
|
|
.ops = &clk_pfd_ops,
|
|
.flags = DM_FLAG_PRE_RELOC,
|
|
};
|