mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-25 12:33:41 +00:00
104 lines
2.3 KiB
C
104 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright (c) 2016, NVIDIA CORPORATION.
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <clk-uclass.h>
|
|
#include <dm.h>
|
|
#include <log.h>
|
|
#include <malloc.h>
|
|
#include <asm/arch/clock.h>
|
|
#include <asm/arch-tegra/clk_rst.h>
|
|
|
|
static int tegra_car_clk_request(struct clk *clk)
|
|
{
|
|
debug("%s(clk=%p) (dev=%p, id=%lu)\n", __func__, clk, clk->dev,
|
|
clk->id);
|
|
|
|
/*
|
|
* Note that the first PERIPH_ID_COUNT clock IDs (where the value
|
|
* varies per SoC) are the peripheral clocks, which use a numbering
|
|
* scheme that matches HW registers 1:1. There are other clock IDs
|
|
* beyond this that are assigned arbitrarily by the Tegra CAR DT
|
|
* binding. Due to the implementation of this driver, it currently
|
|
* only supports the peripheral IDs.
|
|
*/
|
|
if (clk->id >= PERIPH_ID_COUNT)
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int tegra_car_clk_free(struct clk *clk)
|
|
{
|
|
debug("%s(clk=%p) (dev=%p, id=%lu)\n", __func__, clk, clk->dev,
|
|
clk->id);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static ulong tegra_car_clk_get_rate(struct clk *clk)
|
|
{
|
|
enum clock_id parent;
|
|
|
|
debug("%s(clk=%p) (dev=%p, id=%lu)\n", __func__, clk, clk->dev,
|
|
clk->id);
|
|
|
|
parent = clock_get_periph_parent(clk->id);
|
|
return clock_get_periph_rate(clk->id, parent);
|
|
}
|
|
|
|
static ulong tegra_car_clk_set_rate(struct clk *clk, ulong rate)
|
|
{
|
|
enum clock_id parent;
|
|
|
|
debug("%s(clk=%p, rate=%lu) (dev=%p, id=%lu)\n", __func__, clk, rate,
|
|
clk->dev, clk->id);
|
|
|
|
parent = clock_get_periph_parent(clk->id);
|
|
return clock_adjust_periph_pll_div(clk->id, parent, rate, NULL);
|
|
}
|
|
|
|
static int tegra_car_clk_enable(struct clk *clk)
|
|
{
|
|
debug("%s(clk=%p) (dev=%p, id=%lu)\n", __func__, clk, clk->dev,
|
|
clk->id);
|
|
|
|
clock_enable(clk->id);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int tegra_car_clk_disable(struct clk *clk)
|
|
{
|
|
debug("%s(clk=%p) (dev=%p, id=%lu)\n", __func__, clk, clk->dev,
|
|
clk->id);
|
|
|
|
clock_disable(clk->id);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct clk_ops tegra_car_clk_ops = {
|
|
.request = tegra_car_clk_request,
|
|
.rfree = tegra_car_clk_free,
|
|
.get_rate = tegra_car_clk_get_rate,
|
|
.set_rate = tegra_car_clk_set_rate,
|
|
.enable = tegra_car_clk_enable,
|
|
.disable = tegra_car_clk_disable,
|
|
};
|
|
|
|
static int tegra_car_clk_probe(struct udevice *dev)
|
|
{
|
|
debug("%s(dev=%p)\n", __func__, dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
U_BOOT_DRIVER(tegra_car_clk) = {
|
|
.name = "tegra_car_clk",
|
|
.id = UCLASS_CLK,
|
|
.probe = tegra_car_clk_probe,
|
|
.ops = &tegra_car_clk_ops,
|
|
};
|