1 files changed, 241 insertions, 0 deletions
diff --git a/drivers/clk/tegra/clk-periph.c b/drivers/clk/tegra/clk-periph.c
new file mode 100644
index 0000000000..0626650a70
--- /dev/null
+++ b/drivers/clk/tegra/clk-periph.c
@@ -0,0 +1,241 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
+ */
+
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/export.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+
+#include "clk.h"
+
+static u8 clk_periph_get_parent(struct clk_hw *hw)
+{
+	struct tegra_clk_periph *periph = to_clk_periph(hw);
+	const struct clk_ops *mux_ops = periph->mux_ops;
+	struct clk_hw *mux_hw = &periph->mux.hw;
+
+	__clk_hw_set_clk(mux_hw, hw);
+
+	return mux_ops->get_parent(mux_hw);
+}
+
+static int clk_periph_set_parent(struct clk_hw *hw, u8 index)
+{
+	struct tegra_clk_periph *periph = to_clk_periph(hw);
+	const struct clk_ops *mux_ops = periph->mux_ops;
+	struct clk_hw *mux_hw = &periph->mux.hw;
+
+	__clk_hw_set_clk(mux_hw, hw);
+
+	return mux_ops->set_parent(mux_hw, index);
+}
+
+static unsigned long clk_periph_recalc_rate(struct clk_hw *hw,
+					    unsigned long parent_rate)
+{
+	struct tegra_clk_periph *periph = to_clk_periph(hw);
+	const struct clk_ops *div_ops = periph->div_ops;
+	struct clk_hw *div_hw = &periph->divider.hw;
+
+	__clk_hw_set_clk(div_hw, hw);
+
+	return div_ops->recalc_rate(div_hw, parent_rate);
+}
+
+static int clk_periph_determine_rate(struct clk_hw *hw,
+				     struct clk_rate_request *req)
+{
+	struct tegra_clk_periph *periph = to_clk_periph(hw);
+	const struct clk_ops *div_ops = periph->div_ops;
+	struct clk_hw *div_hw = &periph->divider.hw;
+	unsigned long rate;
+
+	__clk_hw_set_clk(div_hw, hw);
+
+	rate = div_ops->round_rate(div_hw, req->rate, &req->best_parent_rate);
+	if (rate < 0)
+		return rate;
+
+	req->rate = rate;
+	return 0;
+}
+
+static int clk_periph_set_rate(struct clk_hw *hw, unsigned long rate,
+			       unsigned long parent_rate)
+{
+	struct tegra_clk_periph *periph = to_clk_periph(hw);
+	const struct clk_ops *div_ops = periph->div_ops;
+	struct clk_hw *div_hw = &periph->divider.hw;
+
+	__clk_hw_set_clk(div_hw, hw);
+
+	return div_ops->set_rate(div_hw, rate, parent_rate);
+}
+
+static int clk_periph_is_enabled(struct clk_hw *hw)
+{
+	struct tegra_clk_periph *periph = to_clk_periph(hw);
+	const struct clk_ops *gate_ops = periph->gate_ops;
+	struct clk_hw *gate_hw = &periph->gate.hw;
+
+	__clk_hw_set_clk(gate_hw, hw);
+
+	return gate_ops->is_enabled(gate_hw);
+}
+
+static int clk_periph_enable(struct clk_hw *hw)
+{
+	struct tegra_clk_periph *periph = to_clk_periph(hw);
+	const struct clk_ops *gate_ops = periph->gate_ops;
+	struct clk_hw *gate_hw = &periph->gate.hw;
+
+	__clk_hw_set_clk(gate_hw, hw);
+
+	return gate_ops->enable(gate_hw);
+}
+
+static void clk_periph_disable(struct clk_hw *hw)
+{
+	struct tegra_clk_periph *periph = to_clk_periph(hw);
+	const struct clk_ops *gate_ops = periph->gate_ops;
+	struct clk_hw *gate_hw = &periph->gate.hw;
+
+	gate_ops->disable(gate_hw);
+}
+
+static void clk_periph_disable_unused(struct clk_hw *hw)
+{
+	struct tegra_clk_periph *periph = to_clk_periph(hw);
+	const struct clk_ops *gate_ops = periph->gate_ops;
+	struct clk_hw *gate_hw = &periph->gate.hw;
+
+	gate_ops->disable_unused(gate_hw);
+}
+
+static void clk_periph_restore_context(struct clk_hw *hw)
+{
+	struct tegra_clk_periph *periph = to_clk_periph(hw);
+	const struct clk_ops *div_ops = periph->div_ops;
+	struct clk_hw *div_hw = &periph->divider.hw;
+	int parent_id;
+
+	parent_id = clk_hw_get_parent_index(hw);
+	if (WARN_ON(parent_id < 0))
+		return;
+
+	if (!(periph->gate.flags & TEGRA_PERIPH_NO_DIV))
+		div_ops->restore_context(div_hw);
+
+	clk_periph_set_parent(hw, parent_id);
+}
+
+const struct clk_ops tegra_clk_periph_ops = {
+	.get_parent = clk_periph_get_parent,
+	.set_parent = clk_periph_set_parent,
+	.recalc_rate = clk_periph_recalc_rate,
+	.determine_rate = clk_periph_determine_rate,
+	.set_rate = clk_periph_set_rate,
+	.is_enabled = clk_periph_is_enabled,
+	.enable = clk_periph_enable,
+	.disable = clk_periph_disable,
+	.disable_unused = clk_periph_disable_unused,
+	.restore_context = clk_periph_restore_context,
+};
+
+static const struct clk_ops tegra_clk_periph_nodiv_ops = {
+	.determine_rate = clk_hw_determine_rate_no_reparent,
+	.get_parent = clk_periph_get_parent,
+	.set_parent = clk_periph_set_parent,
+	.is_enabled = clk_periph_is_enabled,
+	.enable = clk_periph_enable,
+	.disable = clk_periph_disable,
+	.disable_unused = clk_periph_disable_unused,
+	.restore_context = clk_periph_restore_context,
+};
+
+static const struct clk_ops tegra_clk_periph_no_gate_ops = {
+	.get_parent = clk_periph_get_parent,
+	.set_parent = clk_periph_set_parent,
+	.recalc_rate = clk_periph_recalc_rate,
+	.determine_rate = clk_periph_determine_rate,
+	.set_rate = clk_periph_set_rate,
+	.restore_context = clk_periph_restore_context,
+};
+
+static struct clk *_tegra_clk_register_periph(const char *name,
+			const char * const *parent_names, int num_parents,
+			struct tegra_clk_periph *periph,
+			void __iomem *clk_base, u32 offset,
+			unsigned long flags)
+{
+	struct clk *clk;
+	struct clk_init_data init;
+	const struct tegra_clk_periph_regs *bank;
+	bool div = !(periph->gate.flags & TEGRA_PERIPH_NO_DIV);
+
+	if (periph->gate.flags & TEGRA_PERIPH_NO_DIV) {
+		flags |= CLK_SET_RATE_PARENT;
+		init.ops = &tegra_clk_periph_nodiv_ops;
+	} else if (periph->gate.flags & TEGRA_PERIPH_NO_GATE)
+		init.ops = &tegra_clk_periph_no_gate_ops;
+	else
+		init.ops = &tegra_clk_periph_ops;
+
+	init.name = name;
+	init.flags = flags;
+	init.parent_names = parent_names;
+	init.num_parents = num_parents;
+
+	bank = get_reg_bank(periph->gate.clk_num);
+	if (!bank)
+		return ERR_PTR(-EINVAL);
+
+	/* Data in .init is copied by clk_register(), so stack variable OK */
+	periph->hw.init = &init;
+	periph->magic = TEGRA_CLK_PERIPH_MAGIC;
+	periph->mux.reg = clk_base + offset;
+	periph->divider.reg = div ? (clk_base + offset) : NULL;
+	periph->gate.clk_base = clk_base;
+	periph->gate.regs = bank;
+	periph->gate.enable_refcnt = periph_clk_enb_refcnt;
+
+	clk = clk_register(NULL, &periph->hw);
+	if (IS_ERR(clk))
+		return clk;
+
+	periph->mux.hw.clk = clk;
+	periph->divider.hw.clk = div ? clk : NULL;
+	periph->gate.hw.clk = clk;
+
+	return clk;
+}
+
+struct clk *tegra_clk_register_periph(const char *name,
+		const char * const *parent_names, int num_parents,
+		struct tegra_clk_periph *periph, void __iomem *clk_base,
+		u32 offset, unsigned long flags)
+{
+	return _tegra_clk_register_periph(name, parent_names, num_parents,
+			periph, clk_base, offset, flags);
+}
+
+struct clk *tegra_clk_register_periph_nodiv(const char *name,
+		const char * const *parent_names, int num_parents,
+		struct tegra_clk_periph *periph, void __iomem *clk_base,
+		u32 offset)
+{
+	periph->gate.flags |= TEGRA_PERIPH_NO_DIV;
+	return _tegra_clk_register_periph(name, parent_names, num_parents,
+			periph, clk_base, offset, CLK_SET_RATE_PARENT);
+}
+
+struct clk *tegra_clk_register_periph_data(void __iomem *clk_base,
+					   struct tegra_periph_init_data *init)
+{
+	return _tegra_clk_register_periph(init->name, init->p.parent_names,
+					  init->num_parents, &init->periph,
+					  clk_base, init->offset, init->flags);
+}