summaryrefslogtreecommitdiffstats
path: root/drivers/clk/visconti/clkc.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/clk/visconti/clkc.c')
-rw-r--r--drivers/clk/visconti/clkc.c206
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 000000000..d0b193b5d
--- /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;
+}