+// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2015 Google, Inc
* Written by Simon Glass <sjg@chromium.org>
* Copyright (c) 2016, NVIDIA CORPORATION.
- *
- * SPDX-License-Identifier: GPL-2.0+
+ * 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)
{
else
clk->id = 0;
+ clk->data = 0;
+
return 0;
}
-int clk_get_by_index(struct udevice *dev, int index, struct clk *clk)
+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)
{
- 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;
+ if (ret)
+ goto err;
- ret = dev_read_phandle_with_args(dev, "clocks", "#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);
+ 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);
ops = clk_dev_ops(dev_clk);
if (ops->of_xlate)
- ret = ops->of_xlate(clk, &args);
+ ret = ops->of_xlate(clk, args);
else
- ret = clk_of_xlate_default(clk, &args);
+ 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 */
return clk_get_by_index(dev, index, clk);
}
+int clk_get_by_name_nodev(ofnode node, const char *name, struct clk *clk)
+{
+ int index;
+
+ debug("%s(node=%p, name=%s, clk=%p)\n", __func__,
+ ofnode_get_name(node), name, clk);
+ clk->dev = NULL;
+
+ index = ofnode_stringlist_search(node, "clock-names", name);
+ if (index < 0) {
+ debug("fdt_stringlist_search() failed: %d\n", index);
+ return index;
+ }
+
+ return clk_get_by_index_nodev(node, index, clk);
+}
+
+int clk_get_optional_nodev(ofnode node, const char *name, struct clk *clk)
+{
+ int ret;
+
+ ret = clk_get_by_name_nodev(node, name, clk);
+ if (ret == -ENODATA)
+ return 0;
+
+ return ret;
+}
+
int clk_release_all(struct clk *clk, int count)
{
int i, ret;
int clk_request(struct udevice *dev, struct clk *clk)
{
- const struct clk_ops *ops = clk_dev_ops(dev);
+ 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;
int clk_free(struct clk *clk)
{
- const struct clk_ops *ops = clk_dev_ops(clk->dev);
+ const struct clk_ops *ops;
debug("%s(clk=%p)\n", __func__, clk);
+ if (!clk_valid(clk))
+ return 0;
+ ops = clk_dev_ops(clk->dev);
if (!ops->free)
return 0;
ulong clk_get_rate(struct clk *clk)
{
- const struct clk_ops *ops = clk_dev_ops(clk->dev);
+ const struct clk_ops *ops;
debug("%s(clk=%p)\n", __func__, clk);
+ if (!clk_valid(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_valid(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_valid(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 = clk_dev_ops(clk->dev);
+ const struct clk_ops *ops;
debug("%s(clk=%p, rate=%lu)\n", __func__, clk, rate);
+ if (!clk_valid(clk))
+ return 0;
+ ops = clk_dev_ops(clk->dev);
if (!ops->set_rate)
return -ENOSYS;
int clk_set_parent(struct clk *clk, struct clk *parent)
{
- const struct clk_ops *ops = clk_dev_ops(clk->dev);
+ const struct clk_ops *ops;
debug("%s(clk=%p, parent=%p)\n", __func__, clk, parent);
+ if (!clk_valid(clk))
+ return 0;
+ ops = clk_dev_ops(clk->dev);
if (!ops->set_parent)
return -ENOSYS;
int clk_enable(struct clk *clk)
{
- const struct clk_ops *ops = clk_dev_ops(clk->dev);
+ const struct clk_ops *ops;
+ struct clk *clkp = NULL;
+ int ret;
debug("%s(clk=%p)\n", __func__, clk);
+ if (!clk_valid(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);
+ }
- if (!ops->enable)
- return -ENOSYS;
+ return 0;
+}
- 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);
+ const struct clk_ops *ops;
+ struct clk *clkp = NULL;
+ int ret;
debug("%s(clk=%p)\n", __func__, clk);
+ if (!clk_valid(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);
+ }
- if (!ops->disable)
- return -ENOSYS;
+ 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 ops->disable(clk);
+ 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 (PTR_ERR(clk) == -ENODATA)
+ 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,
};
projects / oweals / u-boot.git / blobdiff