u-boot/drivers/clk/clk_vexpress_osc.c
Simon Glass 41575d8e4c dm: treewide: Rename auto_alloc_size members to be shorter
This construct is quite long-winded. In earlier days it made some sense
since auto-allocation was a strange concept. But with driver model now
used pretty universally, we can shorten this to 'auto'. This reduces
verbosity and makes it easier to read.

Coincidentally it also ensures that every declaration is on one line,
thus making dtoc's job easier.

Signed-off-by: Simon Glass <sjg@chromium.org>
2020-12-13 08:00:25 -07:00

112 lines
2.5 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2018 Arm Ltd
* Author: Liviu Dudau <liviu.dudau@foss.arm.com>
*
*/
#define DEBUG
#include <common.h>
#include <clk-uclass.h>
#include <dm.h>
#include <log.h>
#include <dm/device_compat.h>
#include <dm/lists.h>
#include <errno.h>
#include <misc.h>
#include <linux/bitops.h>
#define CLK_FUNCTION BIT(20)
struct vexpress_osc_clk_priv {
u8 osc;
ulong rate_min;
ulong rate_max;
};
static ulong vexpress_osc_clk_get_rate(struct clk *clk)
{
int err;
u32 data;
struct udevice *vexpress_cfg = dev_get_parent(clk->dev);
struct vexpress_osc_clk_priv *priv = dev_get_priv(clk->dev);
data = CLK_FUNCTION | priv->osc;
err = misc_read(vexpress_cfg, 0, &data, sizeof(data));
if (err < 0)
return err;
return data;
}
#ifndef CONFIG_SPL_BUILD
static ulong vexpress_osc_clk_set_rate(struct clk *clk, ulong rate)
{
int err;
u32 buffer[2];
struct udevice *vexpress_cfg = dev_get_parent(clk->dev);
struct vexpress_osc_clk_priv *priv = dev_get_priv(clk->dev);
if (rate < priv->rate_min || rate > priv->rate_max)
return -EINVAL;
/*
* we are sending the parent the info about the oscillator
* and the value we want to set
*/
buffer[0] = CLK_FUNCTION | priv->osc;
buffer[1] = rate;
err = misc_write(vexpress_cfg, 0, buffer, 2 * sizeof(u32));
if (err < 0)
return err;
return rate;
}
#endif
static struct clk_ops vexpress_osc_clk_ops = {
.get_rate = vexpress_osc_clk_get_rate,
#ifndef CONFIG_SPL_BUILD
.set_rate = vexpress_osc_clk_set_rate,
#endif
};
static int vexpress_osc_clk_probe(struct udevice *dev)
{
struct vexpress_osc_clk_priv *priv = dev_get_priv(dev);
u32 values[2];
int err;
err = dev_read_u32_array(dev, "freq-range", values, 2);
if (err)
return err;
priv->rate_min = values[0];
priv->rate_max = values[1];
err = dev_read_u32_array(dev, "arm,vexpress-sysreg,func", values, 2);
if (err)
return err;
if (values[0] != 1) {
dev_err(dev, "Invalid VExpress function for clock, must be '1'");
return -EINVAL;
}
priv->osc = values[1];
debug("clk \"%s%d\", min freq %luHz, max freq %luHz\n", dev->name,
priv->osc, priv->rate_min, priv->rate_max);
return 0;
}
static const struct udevice_id vexpress_osc_clk_ids[] = {
{ .compatible = "arm,vexpress-osc", },
{}
};
U_BOOT_DRIVER(vexpress_osc_clk) = {
.name = "vexpress_osc_clk",
.id = UCLASS_CLK,
.of_match = vexpress_osc_clk_ids,
.ops = &vexpress_osc_clk_ops,
.priv_auto = sizeof(struct vexpress_osc_clk_priv),
.probe = vexpress_osc_clk_probe,
};