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path: root/drivers/clk/clk-composite.c
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-rw-r--r--drivers/clk/clk-composite.c492
1 files changed, 492 insertions, 0 deletions
diff --git a/drivers/clk/clk-composite.c b/drivers/clk/clk-composite.c
new file mode 100644
index 0000000000..66759fe28f
--- /dev/null
+++ b/drivers/clk/clk-composite.c
@@ -0,0 +1,492 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2013 NVIDIA CORPORATION. All rights reserved.
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+
+static u8 clk_composite_get_parent(struct clk_hw *hw)
+{
+ struct clk_composite *composite = to_clk_composite(hw);
+ const struct clk_ops *mux_ops = composite->mux_ops;
+ struct clk_hw *mux_hw = composite->mux_hw;
+
+ __clk_hw_set_clk(mux_hw, hw);
+
+ return mux_ops->get_parent(mux_hw);
+}
+
+static int clk_composite_set_parent(struct clk_hw *hw, u8 index)
+{
+ struct clk_composite *composite = to_clk_composite(hw);
+ const struct clk_ops *mux_ops = composite->mux_ops;
+ struct clk_hw *mux_hw = composite->mux_hw;
+
+ __clk_hw_set_clk(mux_hw, hw);
+
+ return mux_ops->set_parent(mux_hw, index);
+}
+
+static unsigned long clk_composite_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct clk_composite *composite = to_clk_composite(hw);
+ const struct clk_ops *rate_ops = composite->rate_ops;
+ struct clk_hw *rate_hw = composite->rate_hw;
+
+ __clk_hw_set_clk(rate_hw, hw);
+
+ return rate_ops->recalc_rate(rate_hw, parent_rate);
+}
+
+static int clk_composite_determine_rate_for_parent(struct clk_hw *rate_hw,
+ struct clk_rate_request *req,
+ struct clk_hw *parent_hw,
+ const struct clk_ops *rate_ops)
+{
+ long rate;
+
+ req->best_parent_hw = parent_hw;
+ req->best_parent_rate = clk_hw_get_rate(parent_hw);
+
+ if (rate_ops->determine_rate)
+ return rate_ops->determine_rate(rate_hw, req);
+
+ rate = rate_ops->round_rate(rate_hw, req->rate,
+ &req->best_parent_rate);
+ if (rate < 0)
+ return rate;
+
+ req->rate = rate;
+
+ return 0;
+}
+
+static int clk_composite_determine_rate(struct clk_hw *hw,
+ struct clk_rate_request *req)
+{
+ struct clk_composite *composite = to_clk_composite(hw);
+ const struct clk_ops *rate_ops = composite->rate_ops;
+ const struct clk_ops *mux_ops = composite->mux_ops;
+ struct clk_hw *rate_hw = composite->rate_hw;
+ struct clk_hw *mux_hw = composite->mux_hw;
+ struct clk_hw *parent;
+ unsigned long rate_diff;
+ unsigned long best_rate_diff = ULONG_MAX;
+ unsigned long best_rate = 0;
+ int i, ret;
+
+ if (rate_hw && rate_ops &&
+ (rate_ops->determine_rate || rate_ops->round_rate) &&
+ mux_hw && mux_ops && mux_ops->set_parent) {
+ req->best_parent_hw = NULL;
+
+ if (clk_hw_get_flags(hw) & CLK_SET_RATE_NO_REPARENT) {
+ struct clk_rate_request tmp_req;
+
+ parent = clk_hw_get_parent(mux_hw);
+
+ clk_hw_forward_rate_request(hw, req, parent, &tmp_req, req->rate);
+ ret = clk_composite_determine_rate_for_parent(rate_hw,
+ &tmp_req,
+ parent,
+ rate_ops);
+ if (ret)
+ return ret;
+
+ req->rate = tmp_req.rate;
+ req->best_parent_hw = tmp_req.best_parent_hw;
+ req->best_parent_rate = tmp_req.best_parent_rate;
+
+ return 0;
+ }
+
+ for (i = 0; i < clk_hw_get_num_parents(mux_hw); i++) {
+ struct clk_rate_request tmp_req;
+
+ parent = clk_hw_get_parent_by_index(mux_hw, i);
+ if (!parent)
+ continue;
+
+ clk_hw_forward_rate_request(hw, req, parent, &tmp_req, req->rate);
+ ret = clk_composite_determine_rate_for_parent(rate_hw,
+ &tmp_req,
+ parent,
+ rate_ops);
+ if (ret)
+ continue;
+
+ if (req->rate >= tmp_req.rate)
+ rate_diff = req->rate - tmp_req.rate;
+ else
+ rate_diff = tmp_req.rate - req->rate;
+
+ if (!rate_diff || !req->best_parent_hw
+ || best_rate_diff > rate_diff) {
+ req->best_parent_hw = parent;
+ req->best_parent_rate = tmp_req.best_parent_rate;
+ best_rate_diff = rate_diff;
+ best_rate = tmp_req.rate;
+ }
+
+ if (!rate_diff)
+ return 0;
+ }
+
+ req->rate = best_rate;
+ return 0;
+ } else if (rate_hw && rate_ops && rate_ops->determine_rate) {
+ __clk_hw_set_clk(rate_hw, hw);
+ return rate_ops->determine_rate(rate_hw, req);
+ } else if (mux_hw && mux_ops && mux_ops->determine_rate) {
+ __clk_hw_set_clk(mux_hw, hw);
+ return mux_ops->determine_rate(mux_hw, req);
+ } else {
+ pr_err("clk: clk_composite_determine_rate function called, but no mux or rate callback set!\n");
+ return -EINVAL;
+ }
+}
+
+static long clk_composite_round_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long *prate)
+{
+ struct clk_composite *composite = to_clk_composite(hw);
+ const struct clk_ops *rate_ops = composite->rate_ops;
+ struct clk_hw *rate_hw = composite->rate_hw;
+
+ __clk_hw_set_clk(rate_hw, hw);
+
+ return rate_ops->round_rate(rate_hw, rate, prate);
+}
+
+static int clk_composite_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate)
+{
+ struct clk_composite *composite = to_clk_composite(hw);
+ const struct clk_ops *rate_ops = composite->rate_ops;
+ struct clk_hw *rate_hw = composite->rate_hw;
+
+ __clk_hw_set_clk(rate_hw, hw);
+
+ return rate_ops->set_rate(rate_hw, rate, parent_rate);
+}
+
+static int clk_composite_set_rate_and_parent(struct clk_hw *hw,
+ unsigned long rate,
+ unsigned long parent_rate,
+ u8 index)
+{
+ struct clk_composite *composite = to_clk_composite(hw);
+ const struct clk_ops *rate_ops = composite->rate_ops;
+ const struct clk_ops *mux_ops = composite->mux_ops;
+ struct clk_hw *rate_hw = composite->rate_hw;
+ struct clk_hw *mux_hw = composite->mux_hw;
+ unsigned long temp_rate;
+
+ __clk_hw_set_clk(rate_hw, hw);
+ __clk_hw_set_clk(mux_hw, hw);
+
+ temp_rate = rate_ops->recalc_rate(rate_hw, parent_rate);
+ if (temp_rate > rate) {
+ rate_ops->set_rate(rate_hw, rate, parent_rate);
+ mux_ops->set_parent(mux_hw, index);
+ } else {
+ mux_ops->set_parent(mux_hw, index);
+ rate_ops->set_rate(rate_hw, rate, parent_rate);
+ }
+
+ return 0;
+}
+
+static int clk_composite_is_enabled(struct clk_hw *hw)
+{
+ struct clk_composite *composite = to_clk_composite(hw);
+ const struct clk_ops *gate_ops = composite->gate_ops;
+ struct clk_hw *gate_hw = composite->gate_hw;
+
+ __clk_hw_set_clk(gate_hw, hw);
+
+ return gate_ops->is_enabled(gate_hw);
+}
+
+static int clk_composite_enable(struct clk_hw *hw)
+{
+ struct clk_composite *composite = to_clk_composite(hw);
+ const struct clk_ops *gate_ops = composite->gate_ops;
+ struct clk_hw *gate_hw = composite->gate_hw;
+
+ __clk_hw_set_clk(gate_hw, hw);
+
+ return gate_ops->enable(gate_hw);
+}
+
+static void clk_composite_disable(struct clk_hw *hw)
+{
+ struct clk_composite *composite = to_clk_composite(hw);
+ const struct clk_ops *gate_ops = composite->gate_ops;
+ struct clk_hw *gate_hw = composite->gate_hw;
+
+ __clk_hw_set_clk(gate_hw, hw);
+
+ gate_ops->disable(gate_hw);
+}
+
+static struct clk_hw *__clk_hw_register_composite(struct device *dev,
+ const char *name, const char * const *parent_names,
+ const struct clk_parent_data *pdata, int num_parents,
+ struct clk_hw *mux_hw, const struct clk_ops *mux_ops,
+ struct clk_hw *rate_hw, const struct clk_ops *rate_ops,
+ struct clk_hw *gate_hw, const struct clk_ops *gate_ops,
+ unsigned long flags)
+{
+ struct clk_hw *hw;
+ struct clk_init_data init = {};
+ struct clk_composite *composite;
+ struct clk_ops *clk_composite_ops;
+ int ret;
+
+ composite = kzalloc(sizeof(*composite), GFP_KERNEL);
+ if (!composite)
+ return ERR_PTR(-ENOMEM);
+
+ init.name = name;
+ init.flags = flags;
+ if (parent_names)
+ init.parent_names = parent_names;
+ else
+ init.parent_data = pdata;
+ init.num_parents = num_parents;
+ hw = &composite->hw;
+
+ clk_composite_ops = &composite->ops;
+
+ if (mux_hw && mux_ops) {
+ if (!mux_ops->get_parent) {
+ hw = ERR_PTR(-EINVAL);
+ goto err;
+ }
+
+ composite->mux_hw = mux_hw;
+ composite->mux_ops = mux_ops;
+ clk_composite_ops->get_parent = clk_composite_get_parent;
+ if (mux_ops->set_parent)
+ clk_composite_ops->set_parent = clk_composite_set_parent;
+ if (mux_ops->determine_rate)
+ clk_composite_ops->determine_rate = clk_composite_determine_rate;
+ }
+
+ if (rate_hw && rate_ops) {
+ if (!rate_ops->recalc_rate) {
+ hw = ERR_PTR(-EINVAL);
+ goto err;
+ }
+ clk_composite_ops->recalc_rate = clk_composite_recalc_rate;
+
+ if (rate_ops->determine_rate)
+ clk_composite_ops->determine_rate =
+ clk_composite_determine_rate;
+ else if (rate_ops->round_rate)
+ clk_composite_ops->round_rate =
+ clk_composite_round_rate;
+
+ /* .set_rate requires either .round_rate or .determine_rate */
+ if (rate_ops->set_rate) {
+ if (rate_ops->determine_rate || rate_ops->round_rate)
+ clk_composite_ops->set_rate =
+ clk_composite_set_rate;
+ else
+ WARN(1, "%s: missing round_rate op is required\n",
+ __func__);
+ }
+
+ composite->rate_hw = rate_hw;
+ composite->rate_ops = rate_ops;
+ }
+
+ if (mux_hw && mux_ops && rate_hw && rate_ops) {
+ if (mux_ops->set_parent && rate_ops->set_rate)
+ clk_composite_ops->set_rate_and_parent =
+ clk_composite_set_rate_and_parent;
+ }
+
+ if (gate_hw && gate_ops) {
+ if (!gate_ops->is_enabled || !gate_ops->enable ||
+ !gate_ops->disable) {
+ hw = ERR_PTR(-EINVAL);
+ goto err;
+ }
+
+ composite->gate_hw = gate_hw;
+ composite->gate_ops = gate_ops;
+ clk_composite_ops->is_enabled = clk_composite_is_enabled;
+ clk_composite_ops->enable = clk_composite_enable;
+ clk_composite_ops->disable = clk_composite_disable;
+ }
+
+ init.ops = clk_composite_ops;
+ composite->hw.init = &init;
+
+ ret = clk_hw_register(dev, hw);
+ if (ret) {
+ hw = ERR_PTR(ret);
+ goto err;
+ }
+
+ if (composite->mux_hw)
+ composite->mux_hw->clk = hw->clk;
+
+ if (composite->rate_hw)
+ composite->rate_hw->clk = hw->clk;
+
+ if (composite->gate_hw)
+ composite->gate_hw->clk = hw->clk;
+
+ return hw;
+
+err:
+ kfree(composite);
+ return hw;
+}
+
+struct clk_hw *clk_hw_register_composite(struct device *dev, const char *name,
+ const char * const *parent_names, int num_parents,
+ struct clk_hw *mux_hw, const struct clk_ops *mux_ops,
+ struct clk_hw *rate_hw, const struct clk_ops *rate_ops,
+ struct clk_hw *gate_hw, const struct clk_ops *gate_ops,
+ unsigned long flags)
+{
+ return __clk_hw_register_composite(dev, name, parent_names, NULL,
+ num_parents, mux_hw, mux_ops,
+ rate_hw, rate_ops, gate_hw,
+ gate_ops, flags);
+}
+EXPORT_SYMBOL_GPL(clk_hw_register_composite);
+
+struct clk_hw *clk_hw_register_composite_pdata(struct device *dev,
+ const char *name,
+ const struct clk_parent_data *parent_data,
+ int num_parents,
+ struct clk_hw *mux_hw, const struct clk_ops *mux_ops,
+ struct clk_hw *rate_hw, const struct clk_ops *rate_ops,
+ struct clk_hw *gate_hw, const struct clk_ops *gate_ops,
+ unsigned long flags)
+{
+ return __clk_hw_register_composite(dev, name, NULL, parent_data,
+ num_parents, mux_hw, mux_ops,
+ rate_hw, rate_ops, gate_hw,
+ gate_ops, flags);
+}
+
+struct clk *clk_register_composite(struct device *dev, const char *name,
+ const char * const *parent_names, int num_parents,
+ struct clk_hw *mux_hw, const struct clk_ops *mux_ops,
+ struct clk_hw *rate_hw, const struct clk_ops *rate_ops,
+ struct clk_hw *gate_hw, const struct clk_ops *gate_ops,
+ unsigned long flags)
+{
+ struct clk_hw *hw;
+
+ hw = clk_hw_register_composite(dev, name, parent_names, num_parents,
+ mux_hw, mux_ops, rate_hw, rate_ops, gate_hw, gate_ops,
+ flags);
+ if (IS_ERR(hw))
+ return ERR_CAST(hw);
+ return hw->clk;
+}
+EXPORT_SYMBOL_GPL(clk_register_composite);
+
+struct clk *clk_register_composite_pdata(struct device *dev, const char *name,
+ const struct clk_parent_data *parent_data,
+ int num_parents,
+ struct clk_hw *mux_hw, const struct clk_ops *mux_ops,
+ struct clk_hw *rate_hw, const struct clk_ops *rate_ops,
+ struct clk_hw *gate_hw, const struct clk_ops *gate_ops,
+ unsigned long flags)
+{
+ struct clk_hw *hw;
+
+ hw = clk_hw_register_composite_pdata(dev, name, parent_data,
+ num_parents, mux_hw, mux_ops, rate_hw, rate_ops,
+ gate_hw, gate_ops, flags);
+ if (IS_ERR(hw))
+ return ERR_CAST(hw);
+ return hw->clk;
+}
+
+void clk_unregister_composite(struct clk *clk)
+{
+ struct clk_composite *composite;
+ struct clk_hw *hw;
+
+ hw = __clk_get_hw(clk);
+ if (!hw)
+ return;
+
+ composite = to_clk_composite(hw);
+
+ clk_unregister(clk);
+ kfree(composite);
+}
+
+void clk_hw_unregister_composite(struct clk_hw *hw)
+{
+ struct clk_composite *composite;
+
+ composite = to_clk_composite(hw);
+
+ clk_hw_unregister(hw);
+ kfree(composite);
+}
+EXPORT_SYMBOL_GPL(clk_hw_unregister_composite);
+
+static void devm_clk_hw_release_composite(struct device *dev, void *res)
+{
+ clk_hw_unregister_composite(*(struct clk_hw **)res);
+}
+
+static struct clk_hw *__devm_clk_hw_register_composite(struct device *dev,
+ const char *name, const char * const *parent_names,
+ const struct clk_parent_data *pdata, int num_parents,
+ struct clk_hw *mux_hw, const struct clk_ops *mux_ops,
+ struct clk_hw *rate_hw, const struct clk_ops *rate_ops,
+ struct clk_hw *gate_hw, const struct clk_ops *gate_ops,
+ unsigned long flags)
+{
+ struct clk_hw **ptr, *hw;
+
+ ptr = devres_alloc(devm_clk_hw_release_composite, sizeof(*ptr),
+ GFP_KERNEL);
+ if (!ptr)
+ return ERR_PTR(-ENOMEM);
+
+ hw = __clk_hw_register_composite(dev, name, parent_names, pdata,
+ num_parents, mux_hw, mux_ops, rate_hw,
+ rate_ops, gate_hw, gate_ops, flags);
+
+ if (!IS_ERR(hw)) {
+ *ptr = hw;
+ devres_add(dev, ptr);
+ } else {
+ devres_free(ptr);
+ }
+
+ return hw;
+}
+
+struct clk_hw *devm_clk_hw_register_composite_pdata(struct device *dev,
+ const char *name,
+ const struct clk_parent_data *parent_data,
+ int num_parents,
+ struct clk_hw *mux_hw, const struct clk_ops *mux_ops,
+ struct clk_hw *rate_hw, const struct clk_ops *rate_ops,
+ struct clk_hw *gate_hw, const struct clk_ops *gate_ops,
+ unsigned long flags)
+{
+ return __devm_clk_hw_register_composite(dev, name, NULL, parent_data,
+ num_parents, mux_hw, mux_ops,
+ rate_hw, rate_ops, gate_hw,
+ gate_ops, flags);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-25 19:24:04 +0000