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path: root/drivers/clk/sprd/gate.c
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-rw-r--r--drivers/clk/sprd/gate.c135
1 files changed, 135 insertions, 0 deletions
diff --git a/drivers/clk/sprd/gate.c b/drivers/clk/sprd/gate.c
new file mode 100644
index 000000000..56e1714b5
--- /dev/null
+++ b/drivers/clk/sprd/gate.c
@@ -0,0 +1,135 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Spreadtrum gate clock driver
+//
+// Copyright (C) 2017 Spreadtrum, Inc.
+// Author: Chunyan Zhang <chunyan.zhang@spreadtrum.com>
+
+#include <linux/clk-provider.h>
+#include <linux/regmap.h>
+
+#include "gate.h"
+
+static void clk_gate_toggle(const struct sprd_gate *sg, bool en)
+{
+ const struct sprd_clk_common *common = &sg->common;
+ unsigned int reg;
+ bool set = sg->flags & CLK_GATE_SET_TO_DISABLE ? true : false;
+
+ set ^= en;
+
+ regmap_read(common->regmap, common->reg, &reg);
+
+ if (set)
+ reg |= sg->enable_mask;
+ else
+ reg &= ~sg->enable_mask;
+
+ regmap_write(common->regmap, common->reg, reg);
+}
+
+static void clk_sc_gate_toggle(const struct sprd_gate *sg, bool en)
+{
+ const struct sprd_clk_common *common = &sg->common;
+ bool set = sg->flags & CLK_GATE_SET_TO_DISABLE ? 1 : 0;
+ unsigned int offset;
+
+ set ^= en;
+
+ /*
+ * Each set/clear gate clock has three registers:
+ * common->reg - base register
+ * common->reg + offset - set register
+ * common->reg + 2 * offset - clear register
+ */
+ offset = set ? sg->sc_offset : sg->sc_offset * 2;
+
+ regmap_write(common->regmap, common->reg + offset,
+ sg->enable_mask);
+}
+
+static void sprd_gate_disable(struct clk_hw *hw)
+{
+ struct sprd_gate *sg = hw_to_sprd_gate(hw);
+
+ clk_gate_toggle(sg, false);
+}
+
+static int sprd_gate_enable(struct clk_hw *hw)
+{
+ struct sprd_gate *sg = hw_to_sprd_gate(hw);
+
+ clk_gate_toggle(sg, true);
+
+ return 0;
+}
+
+static void sprd_sc_gate_disable(struct clk_hw *hw)
+{
+ struct sprd_gate *sg = hw_to_sprd_gate(hw);
+
+ clk_sc_gate_toggle(sg, false);
+}
+
+static int sprd_sc_gate_enable(struct clk_hw *hw)
+{
+ struct sprd_gate *sg = hw_to_sprd_gate(hw);
+
+ clk_sc_gate_toggle(sg, true);
+
+ return 0;
+}
+
+static int sprd_pll_sc_gate_prepare(struct clk_hw *hw)
+{
+ struct sprd_gate *sg = hw_to_sprd_gate(hw);
+
+ clk_sc_gate_toggle(sg, true);
+ udelay(sg->udelay);
+
+ return 0;
+}
+
+static int sprd_gate_is_enabled(struct clk_hw *hw)
+{
+ struct sprd_gate *sg = hw_to_sprd_gate(hw);
+ struct sprd_clk_common *common = &sg->common;
+ struct clk_hw *parent;
+ unsigned int reg;
+
+ if (sg->flags & SPRD_GATE_NON_AON) {
+ parent = clk_hw_get_parent(hw);
+ if (!parent || !clk_hw_is_enabled(parent))
+ return 0;
+ }
+
+ regmap_read(common->regmap, common->reg, &reg);
+
+ if (sg->flags & CLK_GATE_SET_TO_DISABLE)
+ reg ^= sg->enable_mask;
+
+ reg &= sg->enable_mask;
+
+ return reg ? 1 : 0;
+}
+
+const struct clk_ops sprd_gate_ops = {
+ .disable = sprd_gate_disable,
+ .enable = sprd_gate_enable,
+ .is_enabled = sprd_gate_is_enabled,
+};
+EXPORT_SYMBOL_GPL(sprd_gate_ops);
+
+const struct clk_ops sprd_sc_gate_ops = {
+ .disable = sprd_sc_gate_disable,
+ .enable = sprd_sc_gate_enable,
+ .is_enabled = sprd_gate_is_enabled,
+};
+EXPORT_SYMBOL_GPL(sprd_sc_gate_ops);
+
+const struct clk_ops sprd_pll_sc_gate_ops = {
+ .unprepare = sprd_sc_gate_disable,
+ .prepare = sprd_pll_sc_gate_prepare,
+ .is_enabled = sprd_gate_is_enabled,
+};
+EXPORT_SYMBOL_GPL(sprd_pll_sc_gate_ops);