+// 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>
-DECLARE_GLOBAL_DATA_PTR;
-
-static inline struct clk_ops *clk_dev_ops(struct udevice *dev)
+static inline const struct clk_ops *clk_dev_ops(struct udevice *dev)
{
- return (struct clk_ops *)dev->driver->ops;
+ 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_2_cell *cells, struct clk *clk)
+ struct phandle_1_arg *cells, struct clk *clk)
{
int ret;
ret = uclass_get_device(UCLASS_CLK, 0, &clk->dev);
if (ret)
return ret;
- clk->id = cells[0].id;
+ clk->id = cells[0].arg[0];
return 0;
}
return 0;
}
-int clk_get_by_index(struct udevice *dev, int index, struct clk *clk)
+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;
- struct clk_ops *ops;
+ const struct clk_ops *ops;
debug("%s(dev=%p, index=%d, clk=%p)\n", __func__, dev, index, clk);
assert(clk);
- ret = dev_read_phandle_with_args(dev, "clocks", "#clock-cells", 0,
- index, &args);
+ 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 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) {
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)
{
- struct clk_ops *ops = clk_dev_ops(dev);
+ const struct clk_ops *ops = clk_dev_ops(dev);
debug("%s(dev=%p, clk=%p)\n", __func__, dev, clk);
int clk_free(struct clk *clk)
{
- struct clk_ops *ops = clk_dev_ops(clk->dev);
+ const struct clk_ops *ops = clk_dev_ops(clk->dev);
debug("%s(clk=%p)\n", __func__, clk);
ulong clk_get_rate(struct clk *clk)
{
- struct clk_ops *ops = clk_dev_ops(clk->dev);
+ const struct clk_ops *ops = clk_dev_ops(clk->dev);
debug("%s(clk=%p)\n", __func__, clk);
ulong clk_set_rate(struct clk *clk, ulong rate)
{
- struct clk_ops *ops = clk_dev_ops(clk->dev);
+ const struct clk_ops *ops = clk_dev_ops(clk->dev);
debug("%s(clk=%p, rate=%lu)\n", __func__, clk, rate);
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)
{
- struct clk_ops *ops = clk_dev_ops(clk->dev);
+ const struct clk_ops *ops = clk_dev_ops(clk->dev);
debug("%s(clk=%p)\n", __func__, clk);
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)
{
- struct clk_ops *ops = clk_dev_ops(clk->dev);
+ const struct clk_ops *ops = clk_dev_ops(clk->dev);
debug("%s(clk=%p)\n", __func__, clk);
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",
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