1 files changed, 206 insertions, 0 deletions
diff --git a/drivers/clk/visconti/clkc.c b/drivers/clk/visconti/clkc.c
new file mode 100644
index 000000000000..d0b193b5d0b3
--- /dev/null
+++ b/drivers/clk/visconti/clkc.c
@@ -0,0 +1,206 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Toshiba Visconti clock controller
+ *
+ * Copyright (c) 2021 TOSHIBA CORPORATION
+ * Copyright (c) 2021 Toshiba Electronic Devices & Storage Corporation
+ *
+ * Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp>
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+
+#include "clkc.h"
+
+static inline struct visconti_clk_gate *to_visconti_clk_gate(struct clk_hw *hw)
+{
+	return container_of(hw, struct visconti_clk_gate, hw);
+}
+
+static int visconti_gate_clk_is_enabled(struct clk_hw *hw)
+{
+	struct visconti_clk_gate *gate = to_visconti_clk_gate(hw);
+	u32 clk = BIT(gate->ck_idx);
+	u32 val;
+
+	regmap_read(gate->regmap, gate->ckon_offset, &val);
+	return (val & clk) ? 1 : 0;
+}
+
+static void visconti_gate_clk_disable(struct clk_hw *hw)
+{
+	struct visconti_clk_gate *gate = to_visconti_clk_gate(hw);
+	u32 clk = BIT(gate->ck_idx);
+	unsigned long flags;
+
+	spin_lock_irqsave(gate->lock, flags);
+
+	if (!visconti_gate_clk_is_enabled(hw)) {
+		spin_unlock_irqrestore(gate->lock, flags);
+		return;
+	}
+
+	regmap_update_bits(gate->regmap, gate->ckoff_offset, clk, clk);
+	spin_unlock_irqrestore(gate->lock, flags);
+}
+
+static int visconti_gate_clk_enable(struct clk_hw *hw)
+{
+	struct visconti_clk_gate *gate = to_visconti_clk_gate(hw);
+	u32 clk = BIT(gate->ck_idx);
+	unsigned long flags;
+
+	spin_lock_irqsave(gate->lock, flags);
+	regmap_update_bits(gate->regmap, gate->ckon_offset, clk, clk);
+	spin_unlock_irqrestore(gate->lock, flags);
+
+	return 0;
+}
+
+static const struct clk_ops visconti_clk_gate_ops = {
+	.enable = visconti_gate_clk_enable,
+	.disable = visconti_gate_clk_disable,
+	.is_enabled = visconti_gate_clk_is_enabled,
+};
+
+static struct clk_hw *visconti_clk_register_gate(struct device *dev,
+						 const char *name,
+						 const char *parent_name,
+						 struct regmap *regmap,
+						 const struct visconti_clk_gate_table *clks,
+						 u32	rson_offset,
+						 u32	rsoff_offset,
+						 u8	rs_idx,
+						 spinlock_t *lock)
+{
+	struct visconti_clk_gate *gate;
+	struct clk_parent_data *pdata;
+	struct clk_init_data init;
+	struct clk_hw *hw;
+	int ret;
+
+	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+	if (!pdata)
+		return ERR_PTR(-ENOMEM);
+
+	pdata->name = pdata->fw_name = parent_name;
+
+	gate = devm_kzalloc(dev, sizeof(*gate), GFP_KERNEL);
+	if (!gate)
+		return ERR_PTR(-ENOMEM);
+
+	init.name = name;
+	init.ops = &visconti_clk_gate_ops;
+	init.flags = clks->flags;
+	init.parent_data = pdata;
+	init.num_parents = 1;
+
+	gate->regmap = regmap;
+	gate->ckon_offset = clks->ckon_offset;
+	gate->ckoff_offset = clks->ckoff_offset;
+	gate->ck_idx = clks->ck_idx;
+	gate->rson_offset = rson_offset;
+	gate->rsoff_offset = rsoff_offset;
+	gate->rs_idx = rs_idx;
+	gate->lock = lock;
+	gate->hw.init = &init;
+
+	hw = &gate->hw;
+	ret = devm_clk_hw_register(dev, hw);
+	if (ret)
+		hw = ERR_PTR(ret);
+
+	return hw;
+}
+
+int visconti_clk_register_gates(struct visconti_clk_provider *ctx,
+				const struct visconti_clk_gate_table *clks,
+				int num_gate,
+				const struct visconti_reset_data *reset,
+				spinlock_t *lock)
+{
+	struct device *dev = ctx->dev;
+	int i;
+
+	for (i = 0; i < num_gate; i++) {
+		const char *parent_div_name = clks[i].parent_data[0].name;
+		struct clk_parent_data *pdata;
+		u32 rson_offset, rsoff_offset;
+		struct clk_hw *gate_clk;
+		struct clk_hw *div_clk;
+		char *dev_name;
+		u8 rs_idx;
+
+		pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+		if (!pdata)
+			return -ENOMEM;
+
+		dev_name = devm_kasprintf(dev, GFP_KERNEL, "%s_div", clks[i].name);
+		if (!dev_name)
+			return -ENOMEM;
+
+		if (clks[i].rs_id != NO_RESET) {
+			rson_offset = reset[clks[i].rs_id].rson_offset;
+			rsoff_offset = reset[clks[i].rs_id].rsoff_offset;
+			rs_idx = reset[clks[i].rs_id].rs_idx;
+		} else {
+			rson_offset = rsoff_offset = rs_idx = -1;
+		}
+
+		div_clk = devm_clk_hw_register_fixed_factor(dev,
+							    dev_name,
+							    parent_div_name,
+							    0, 1,
+							    clks[i].div);
+		if (IS_ERR(div_clk))
+			return PTR_ERR(div_clk);
+
+		gate_clk = visconti_clk_register_gate(dev,
+						      clks[i].name,
+						      dev_name,
+						      ctx->regmap,
+						      &clks[i],
+						      rson_offset,
+						      rsoff_offset,
+						      rs_idx,
+						      lock);
+		if (IS_ERR(gate_clk)) {
+			dev_err(dev, "%s: failed to register clock %s\n",
+				__func__, clks[i].name);
+			return PTR_ERR(gate_clk);
+		}
+
+		ctx->clk_data.hws[clks[i].id] = gate_clk;
+	}
+
+	return 0;
+}
+
+struct visconti_clk_provider *visconti_init_clk(struct device *dev,
+						struct regmap *regmap,
+						unsigned long nr_clks)
+{
+	struct visconti_clk_provider *ctx;
+	int i;
+
+	ctx = devm_kzalloc(dev, struct_size(ctx, clk_data.hws, nr_clks), GFP_KERNEL);
+	if (!ctx)
+		return ERR_PTR(-ENOMEM);
+
+	for (i = 0; i < nr_clks; ++i)
+		ctx->clk_data.hws[i] = ERR_PTR(-ENOENT);
+	ctx->clk_data.num = nr_clks;
+
+	ctx->dev = dev;
+	ctx->regmap = regmap;
+
+	return ctx;
+}