forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
109 lines
2.4 KiB
109 lines
2.4 KiB
// SPDX-License-Identifier: GPL-2.0+ |
|
/* |
|
* Copyright (C) 2018 Arm Ltd |
|
* Author: Liviu Dudau <[email protected]> |
|
* |
|
*/ |
|
#define DEBUG |
|
#include <common.h> |
|
#include <clk-uclass.h> |
|
#include <dm.h> |
|
#include <dm/lists.h> |
|
#include <errno.h> |
|
#include <misc.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) |
|
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) |
|
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_alloc_size = sizeof(struct vexpress_osc_clk_priv), |
|
.probe = vexpress_osc_clk_probe, |
|
};
|
|
|