u-boot/drivers/clk/clk-uclass.c

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// 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>
#include <linux/clk-provider.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;
clk->data = 0;
return 0;
}
static int clk_get_by_index_tail(int ret, ofnode node,
struct ofnode_phandle_args *args,
const char *list_name, int index,
struct clk *clk)
{
struct udevice *dev_clk;
const struct clk_ops *ops;
assert(clk);
clk->dev = NULL;
if (ret)
goto err;
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);
err:
debug("%s: Node '%s', property '%s', failed to request CLK index %d: %d\n",
__func__, ofnode_get_name(node), list_name, index, ret);
return ret;
}
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;
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;
}
return clk_get_by_index_tail(ret, dev_ofnode(dev), &args, "clocks",
index > 0, clk);
}
int clk_get_by_index(struct udevice *dev, int index, struct clk *clk)
{
struct ofnode_phandle_args args;
int ret;
ret = dev_read_phandle_with_args(dev, "clocks", "#clock-cells", 0,
index, &args);
return clk_get_by_index_tail(ret, dev_ofnode(dev), &args, "clocks",
index > 0, clk);
}
int clk_get_by_index_nodev(ofnode node, int index, struct clk *clk)
{
struct ofnode_phandle_args args;
int ret;
ret = ofnode_parse_phandle_with_args(node, "clocks", "#clock-cells", 0,
index > 0, &args);
return clk_get_by_index_tail(ret, node, &args, "clocks",
index > 0, 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, int stage)
{
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 -ENOENT, this is a no-op entry */
if (ret == -ENOENT)
continue;
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;
}
/* This is clk provider device trying to reparent itself
* It cannot be done right now but need to wait after the
* device is probed
*/
if (stage == 0 && clk.dev == dev)
continue;
if (stage > 0 && clk.dev != dev)
/* do not setup twice the parent clocks */
continue;
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 < 0) {
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, int stage)
{
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++) {
/* If 0 is passed, this is a no-op */
if (!rates[index])
continue;
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;
}
/* This is clk provider device trying to program itself
* It cannot be done right now but need to wait after the
* device is probed
*/
if (stage == 0 && clk.dev == dev)
continue;
if (stage > 0 && clk.dev != dev)
/* do not setup twice the parent clocks */
continue;
ret = clk_set_rate(&clk, rates[index]);
if (ret < 0) {
debug("%s: failed to set rate on clock index %d (%ld) for %s\n",
__func__, index, clk.id, dev_read_name(dev));
break;
}
}
fail:
free(rates);
return ret;
}
int clk_set_defaults(struct udevice *dev, int stage)
{
int ret;
if (!dev_of_valid(dev))
return 0;
/* If this not in SPL and pre-reloc state, don't take any action. */
if (!(IS_ENABLED(CONFIG_SPL_BUILD) || (gd->flags & GD_FLG_RELOC)))
return 0;
debug("%s(%s)\n", __func__, dev_read_name(dev));
ret = clk_set_default_parents(dev, stage);
if (ret)
return ret;
ret = clk_set_default_rates(dev, stage);
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;
debug("%s(dev=%p, clk=%p)\n", __func__, dev, clk);
if (!clk)
return 0;
ops = clk_dev_ops(dev);
clk->dev = dev;
if (!ops->request)
return 0;
return ops->request(clk);
}
int clk_free(struct clk *clk)
{
const struct clk_ops *ops;
debug("%s(clk=%p)\n", __func__, clk);
if (!clk)
return 0;
ops = clk_dev_ops(clk->dev);
if (!ops->free)
return 0;
return ops->free(clk);
}
ulong clk_get_rate(struct clk *clk)
{
const struct clk_ops *ops;
debug("%s(clk=%p)\n", __func__, clk);
if (!clk)
return 0;
ops = clk_dev_ops(clk->dev);
if (!ops->get_rate)
return -ENOSYS;
return ops->get_rate(clk);
}
struct clk *clk_get_parent(struct clk *clk)
{
struct udevice *pdev;
struct clk *pclk;
debug("%s(clk=%p)\n", __func__, clk);
if (!clk)
return NULL;
pdev = dev_get_parent(clk->dev);
pclk = dev_get_clk_ptr(pdev);
if (!pclk)
return ERR_PTR(-ENODEV);
return pclk;
}
long long clk_get_parent_rate(struct clk *clk)
{
const struct clk_ops *ops;
struct clk *pclk;
debug("%s(clk=%p)\n", __func__, clk);
if (!clk)
return 0;
pclk = clk_get_parent(clk);
if (IS_ERR(pclk))
return -ENODEV;
ops = clk_dev_ops(pclk->dev);
if (!ops->get_rate)
return -ENOSYS;
/* Read the 'rate' if not already set or if proper flag set*/
if (!pclk->rate || pclk->flags & CLK_GET_RATE_NOCACHE)
pclk->rate = clk_get_rate(pclk);
return pclk->rate;
}
ulong clk_set_rate(struct clk *clk, ulong rate)
{
const struct clk_ops *ops;
debug("%s(clk=%p, rate=%lu)\n", __func__, clk, rate);
if (!clk)
return 0;
ops = clk_dev_ops(clk->dev);
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;
debug("%s(clk=%p, parent=%p)\n", __func__, clk, parent);
if (!clk)
return 0;
ops = clk_dev_ops(clk->dev);
if (!ops->set_parent)
return -ENOSYS;
return ops->set_parent(clk, parent);
}
int clk_enable(struct clk *clk)
{
const struct clk_ops *ops;
struct clk *clkp = NULL;
int ret;
debug("%s(clk=%p)\n", __func__, clk);
if (!clk)
return 0;
ops = clk_dev_ops(clk->dev);
if (CONFIG_IS_ENABLED(CLK_CCF)) {
/* Take id 0 as a non-valid clk, such as dummy */
if (clk->id && !clk_get_by_id(clk->id, &clkp)) {
if (clkp->enable_count) {
clkp->enable_count++;
return 0;
}
if (clkp->dev->parent &&
device_get_uclass_id(clkp->dev) == UCLASS_CLK) {
ret = clk_enable(dev_get_clk_ptr(clkp->dev->parent));
if (ret) {
printf("Enable %s failed\n",
clkp->dev->parent->name);
return ret;
}
}
}
if (ops->enable) {
ret = ops->enable(clk);
if (ret) {
printf("Enable %s failed\n", clk->dev->name);
return ret;
}
}
if (clkp)
clkp->enable_count++;
} else {
if (!ops->enable)
return -ENOSYS;
return ops->enable(clk);
}
return 0;
}
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;
struct clk *clkp = NULL;
int ret;
debug("%s(clk=%p)\n", __func__, clk);
if (!clk)
return 0;
ops = clk_dev_ops(clk->dev);
if (CONFIG_IS_ENABLED(CLK_CCF)) {
if (clk->id && !clk_get_by_id(clk->id, &clkp)) {
if (clkp->enable_count == 0) {
printf("clk %s already disabled\n",
clkp->dev->name);
return 0;
}
if (--clkp->enable_count > 0)
return 0;
}
if (ops->disable) {
ret = ops->disable(clk);
if (ret)
return ret;
}
if (clkp && clkp->dev->parent &&
device_get_uclass_id(clkp->dev) == UCLASS_CLK) {
ret = clk_disable(dev_get_clk_ptr(clkp->dev->parent));
if (ret) {
printf("Disable %s failed\n",
clkp->dev->parent->name);
return ret;
}
}
} else {
if (!ops->disable)
return -ENOSYS;
return ops->disable(clk);
}
return 0;
}
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;
}
int clk_get_by_id(ulong id, struct clk **clkp)
{
struct udevice *dev;
struct uclass *uc;
int ret;
ret = uclass_get(UCLASS_CLK, &uc);
if (ret)
return ret;
uclass_foreach_dev(dev, uc) {
struct clk *clk = dev_get_clk_ptr(dev);
if (clk && clk->id == id) {
*clkp = clk;
return 0;
}
}
return -ENOENT;
}
bool clk_is_match(const struct clk *p, const struct clk *q)
{
/* trivial case: identical struct clk's or both NULL */
if (p == q)
return true;
/* trivial case #2: on the clk pointer is NULL */
if (!p || !q)
return false;
/* same device, id and data */
if (p->dev == q->dev && p->id == q->id && p->data == q->data)
return true;
return false;
}
static void devm_clk_release(struct udevice *dev, void *res)
{
clk_free(res);
}
static int devm_clk_match(struct udevice *dev, void *res, void *data)
{
return res == data;
}
struct clk *devm_clk_get(struct udevice *dev, const char *id)
{
int rc;
struct clk *clk;
clk = devres_alloc(devm_clk_release, sizeof(struct clk), __GFP_ZERO);
if (unlikely(!clk))
return ERR_PTR(-ENOMEM);
rc = clk_get_by_name(dev, id, clk);
if (rc)
return ERR_PTR(rc);
devres_add(dev, clk);
return clk;
}
struct clk *devm_clk_get_optional(struct udevice *dev, const char *id)
{
struct clk *clk = devm_clk_get(dev, id);
if (IS_ERR(clk))
return NULL;
return clk;
}
void devm_clk_put(struct udevice *dev, struct clk *clk)
{
int rc;
if (!clk)
return;
rc = devres_release(dev, devm_clk_release, devm_clk_match, clk);
WARN_ON(rc);
}
int clk_uclass_post_probe(struct udevice *dev)
{
/*
* when a clock provider is probed. Call clk_set_defaults()
* also after the device is probed. This takes care of cases
* where the DT is used to setup default parents and rates
* using assigned-clocks
*/
clk_set_defaults(dev, 1);
return 0;
}
UCLASS_DRIVER(clk) = {
.id = UCLASS_CLK,
.name = "clk",
.post_probe = clk_uclass_post_probe,
};