u-boot/drivers/clk/clk-uclass.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

412 lines
8 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2015 Google, Inc
* Written by Simon Glass <sjg@chromium.org>
* Copyright (c) 2016, NVIDIA CORPORATION.
* Copyright (c) 2018, Theobroma Systems Design und Consulting GmbH
*/
#include <common.h>
#include <clk.h>
#include <clk-uclass.h>
#include <dm.h>
#include <dm/read.h>
#include <dt-structs.h>
#include <errno.h>
static inline const struct clk_ops *clk_dev_ops(struct udevice *dev)
{
return (const struct clk_ops *)dev->driver->ops;
}
#if CONFIG_IS_ENABLED(OF_CONTROL)
# if CONFIG_IS_ENABLED(OF_PLATDATA)
int clk_get_by_index_platdata(struct udevice *dev, int index,
struct phandle_1_arg *cells, struct clk *clk)
{
int ret;
if (index != 0)
return -ENOSYS;
ret = uclass_get_device(UCLASS_CLK, 0, &clk->dev);
if (ret)
return ret;
clk->id = cells[0].arg[0];
return 0;
}
# else
static int clk_of_xlate_default(struct clk *clk,
struct ofnode_phandle_args *args)
{
debug("%s(clk=%p)\n", __func__, clk);
if (args->args_count > 1) {
debug("Invaild args_count: %d\n", args->args_count);
return -EINVAL;
}
if (args->args_count)
clk->id = args->args[0];
else
clk->id = 0;
return 0;
}
static int clk_get_by_indexed_prop(struct udevice *dev, const char *prop_name,
int index, struct clk *clk)
{
int ret;
struct ofnode_phandle_args args;
struct udevice *dev_clk;
const struct clk_ops *ops;
debug("%s(dev=%p, index=%d, clk=%p)\n", __func__, dev, index, clk);
assert(clk);
clk->dev = NULL;
ret = dev_read_phandle_with_args(dev, prop_name, "#clock-cells", 0,
index, &args);
if (ret) {
debug("%s: fdtdec_parse_phandle_with_args failed: err=%d\n",
__func__, ret);
return ret;
}
ret = uclass_get_device_by_ofnode(UCLASS_CLK, args.node, &dev_clk);
if (ret) {
debug("%s: uclass_get_device_by_of_offset failed: err=%d\n",
__func__, ret);
return ret;
}
clk->dev = dev_clk;
ops = clk_dev_ops(dev_clk);
if (ops->of_xlate)
ret = ops->of_xlate(clk, &args);
else
ret = clk_of_xlate_default(clk, &args);
if (ret) {
debug("of_xlate() failed: %d\n", ret);
return ret;
}
return clk_request(dev_clk, clk);
}
int clk_get_by_index(struct udevice *dev, int index, struct clk *clk)
{
return clk_get_by_indexed_prop(dev, "clocks", index, clk);
}
int clk_get_bulk(struct udevice *dev, struct clk_bulk *bulk)
{
int i, ret, err, count;
bulk->count = 0;
count = dev_count_phandle_with_args(dev, "clocks", "#clock-cells");
if (count < 1)
return count;
bulk->clks = devm_kcalloc(dev, count, sizeof(struct clk), GFP_KERNEL);
if (!bulk->clks)
return -ENOMEM;
for (i = 0; i < count; i++) {
ret = clk_get_by_index(dev, i, &bulk->clks[i]);
if (ret < 0)
goto bulk_get_err;
++bulk->count;
}
return 0;
bulk_get_err:
err = clk_release_all(bulk->clks, bulk->count);
if (err)
debug("%s: could release all clocks for %p\n",
__func__, dev);
return ret;
}
static int clk_set_default_parents(struct udevice *dev)
{
struct clk clk, parent_clk;
int index;
int num_parents;
int ret;
num_parents = dev_count_phandle_with_args(dev, "assigned-clock-parents",
"#clock-cells");
if (num_parents < 0) {
debug("%s: could not read assigned-clock-parents for %p\n",
__func__, dev);
return 0;
}
for (index = 0; index < num_parents; index++) {
ret = clk_get_by_indexed_prop(dev, "assigned-clock-parents",
index, &parent_clk);
if (ret) {
debug("%s: could not get parent clock %d for %s\n",
__func__, index, dev_read_name(dev));
return ret;
}
ret = clk_get_by_indexed_prop(dev, "assigned-clocks",
index, &clk);
if (ret) {
debug("%s: could not get assigned clock %d for %s\n",
__func__, index, dev_read_name(dev));
return ret;
}
ret = clk_set_parent(&clk, &parent_clk);
/*
* Not all drivers may support clock-reparenting (as of now).
* Ignore errors due to this.
*/
if (ret == -ENOSYS)
continue;
if (ret) {
debug("%s: failed to reparent clock %d for %s\n",
__func__, index, dev_read_name(dev));
return ret;
}
}
return 0;
}
static int clk_set_default_rates(struct udevice *dev)
{
struct clk clk;
int index;
int num_rates;
int size;
int ret = 0;
u32 *rates = NULL;
size = dev_read_size(dev, "assigned-clock-rates");
if (size < 0)
return 0;
num_rates = size / sizeof(u32);
rates = calloc(num_rates, sizeof(u32));
if (!rates)
return -ENOMEM;
ret = dev_read_u32_array(dev, "assigned-clock-rates", rates, num_rates);
if (ret)
goto fail;
for (index = 0; index < num_rates; index++) {
ret = clk_get_by_indexed_prop(dev, "assigned-clocks",
index, &clk);
if (ret) {
debug("%s: could not get assigned clock %d for %s\n",
__func__, index, dev_read_name(dev));
continue;
}
ret = clk_set_rate(&clk, rates[index]);
if (ret < 0) {
debug("%s: failed to set rate on clock %d for %s\n",
__func__, index, dev_read_name(dev));
break;
}
}
fail:
free(rates);
return ret;
}
int clk_set_defaults(struct udevice *dev)
{
int ret;
/* If this is running pre-reloc state, don't take any action. */
if (!(gd->flags & GD_FLG_RELOC))
return 0;
debug("%s(%s)\n", __func__, dev_read_name(dev));
ret = clk_set_default_parents(dev);
if (ret)
return ret;
ret = clk_set_default_rates(dev);
if (ret < 0)
return ret;
return 0;
}
# endif /* OF_PLATDATA */
int clk_get_by_name(struct udevice *dev, const char *name, struct clk *clk)
{
int index;
debug("%s(dev=%p, name=%s, clk=%p)\n", __func__, dev, name, clk);
clk->dev = NULL;
index = dev_read_stringlist_search(dev, "clock-names", name);
if (index < 0) {
debug("fdt_stringlist_search() failed: %d\n", index);
return index;
}
return clk_get_by_index(dev, index, clk);
}
int clk_release_all(struct clk *clk, int count)
{
int i, ret;
for (i = 0; i < count; i++) {
debug("%s(clk[%d]=%p)\n", __func__, i, &clk[i]);
/* check if clock has been previously requested */
if (!clk[i].dev)
continue;
ret = clk_disable(&clk[i]);
if (ret && ret != -ENOSYS)
return ret;
ret = clk_free(&clk[i]);
if (ret && ret != -ENOSYS)
return ret;
}
return 0;
}
#endif /* OF_CONTROL */
int clk_request(struct udevice *dev, struct clk *clk)
{
const struct clk_ops *ops = clk_dev_ops(dev);
debug("%s(dev=%p, clk=%p)\n", __func__, dev, clk);
clk->dev = dev;
if (!ops->request)
return 0;
return ops->request(clk);
}
int clk_free(struct clk *clk)
{
const struct clk_ops *ops = clk_dev_ops(clk->dev);
debug("%s(clk=%p)\n", __func__, clk);
if (!ops->free)
return 0;
return ops->free(clk);
}
ulong clk_get_rate(struct clk *clk)
{
const struct clk_ops *ops = clk_dev_ops(clk->dev);
debug("%s(clk=%p)\n", __func__, clk);
if (!ops->get_rate)
return -ENOSYS;
return ops->get_rate(clk);
}
ulong clk_set_rate(struct clk *clk, ulong rate)
{
const struct clk_ops *ops = clk_dev_ops(clk->dev);
debug("%s(clk=%p, rate=%lu)\n", __func__, clk, rate);
if (!ops->set_rate)
return -ENOSYS;
return ops->set_rate(clk, rate);
}
int clk_set_parent(struct clk *clk, struct clk *parent)
{
const struct clk_ops *ops = clk_dev_ops(clk->dev);
debug("%s(clk=%p, parent=%p)\n", __func__, clk, parent);
if (!ops->set_parent)
return -ENOSYS;
return ops->set_parent(clk, parent);
}
int clk_enable(struct clk *clk)
{
const struct clk_ops *ops = clk_dev_ops(clk->dev);
debug("%s(clk=%p)\n", __func__, clk);
if (!ops->enable)
return -ENOSYS;
return ops->enable(clk);
}
int clk_enable_bulk(struct clk_bulk *bulk)
{
int i, ret;
for (i = 0; i < bulk->count; i++) {
ret = clk_enable(&bulk->clks[i]);
if (ret < 0 && ret != -ENOSYS)
return ret;
}
return 0;
}
int clk_disable(struct clk *clk)
{
const struct clk_ops *ops = clk_dev_ops(clk->dev);
debug("%s(clk=%p)\n", __func__, clk);
if (!ops->disable)
return -ENOSYS;
return ops->disable(clk);
}
int clk_disable_bulk(struct clk_bulk *bulk)
{
int i, ret;
for (i = 0; i < bulk->count; i++) {
ret = clk_disable(&bulk->clks[i]);
if (ret < 0 && ret != -ENOSYS)
return ret;
}
return 0;
}
UCLASS_DRIVER(clk) = {
.id = UCLASS_CLK,
.name = "clk",
};