clk: mediatek: clk-mux: Add ops for mux gates with set/clr/upd and FENC

MT8196 uses set/clr/upd registers for mux gate enable/disable control,
along with a FENC bit to check the status. Add new set of mux gate
clock operations with support for set/clr/upd and FENC status logic.

Reviewed-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Chen-Yu Tsai <wenst@chromium.org>
Signed-off-by: Laura Nao <laura.nao@collabora.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

Author: laura-nao

drivers/clk/mediatek/clk-mux.c

@@ -17,6 +17,8 @@
 
 #include "clk-mux.h"
 
+#define MTK_WAIT_FENC_DONE_US	30
+
 struct mtk_clk_mux {
 	struct clk_hw hw;
 	struct regmap *regmap;
@@ -30,6 +32,33 @@ static inline struct mtk_clk_mux *to_mtk_clk_mux(struct clk_hw *hw)
 	return container_of(hw, struct mtk_clk_mux, hw);
 }
 
+static int mtk_clk_mux_fenc_enable_setclr(struct clk_hw *hw)
+{
+	struct mtk_clk_mux *mux = to_mtk_clk_mux(hw);
+	unsigned long flags;
+	u32 val;
+	int ret;
+
+	if (mux->lock)
+		spin_lock_irqsave(mux->lock, flags);
+	else
+		__acquire(mux->lock);
+
+	regmap_write(mux->regmap, mux->data->clr_ofs,
+		     BIT(mux->data->gate_shift));
+
+	ret = regmap_read_poll_timeout_atomic(mux->regmap, mux->data->fenc_sta_mon_ofs,
+					      val, val & BIT(mux->data->fenc_shift), 1,
+					      MTK_WAIT_FENC_DONE_US);
+
+	if (mux->lock)
+		spin_unlock_irqrestore(mux->lock, flags);
+	else
+		__release(mux->lock);
+
+	return ret;
+}
+
 static int mtk_clk_mux_enable_setclr(struct clk_hw *hw)
 {
 	struct mtk_clk_mux *mux = to_mtk_clk_mux(hw);
@@ -70,6 +99,16 @@ static void mtk_clk_mux_disable_setclr(struct clk_hw *hw)
 			BIT(mux->data->gate_shift));
 }
 
+static int mtk_clk_mux_fenc_is_enabled(struct clk_hw *hw)
+{
+	struct mtk_clk_mux *mux = to_mtk_clk_mux(hw);
+	u32 val;
+
+	regmap_read(mux->regmap, mux->data->fenc_sta_mon_ofs, &val);
+
+	return !!(val & BIT(mux->data->fenc_shift));
+}
+
 static int mtk_clk_mux_is_enabled(struct clk_hw *hw)
 {
 	struct mtk_clk_mux *mux = to_mtk_clk_mux(hw);
@@ -166,6 +205,16 @@ const struct clk_ops mtk_mux_gate_clr_set_upd_ops  = {
 };
 EXPORT_SYMBOL_GPL(mtk_mux_gate_clr_set_upd_ops);
 
+const struct clk_ops mtk_mux_gate_fenc_clr_set_upd_ops = {
+	.enable = mtk_clk_mux_fenc_enable_setclr,
+	.disable = mtk_clk_mux_disable_setclr,
+	.is_enabled = mtk_clk_mux_fenc_is_enabled,
+	.get_parent = mtk_clk_mux_get_parent,
+	.set_parent = mtk_clk_mux_set_parent_setclr_lock,
+	.determine_rate = mtk_clk_mux_determine_rate,
+};
+EXPORT_SYMBOL_GPL(mtk_mux_gate_fenc_clr_set_upd_ops);
+
 static struct clk_hw *mtk_clk_register_mux(struct device *dev,
 					   const struct mtk_mux *mux,
 					   struct regmap *regmap,

drivers/clk/mediatek/clk-mux.h

@@ -28,11 +28,13 @@ struct mtk_mux {
 	u32 set_ofs;
 	u32 clr_ofs;
 	u32 upd_ofs;
+	u32 fenc_sta_mon_ofs;
 
 	u8 mux_shift;
 	u8 mux_width;
 	u8 gate_shift;
 	s8 upd_shift;
+	u8 fenc_shift;
 
 	const struct clk_ops *ops;
 	signed char num_parents;
@@ -77,6 +79,7 @@ struct mtk_mux {
 
 extern const struct clk_ops mtk_mux_clr_set_upd_ops;
 extern const struct clk_ops mtk_mux_gate_clr_set_upd_ops;
+extern const struct clk_ops mtk_mux_gate_fenc_clr_set_upd_ops;
 
 #define MUX_GATE_CLR_SET_UPD_FLAGS(_id, _name, _parents, _mux_ofs,	\
 			_mux_set_ofs, _mux_clr_ofs, _shift, _width,	\
@@ -118,6 +121,48 @@ extern const struct clk_ops mtk_mux_gate_clr_set_upd_ops;
 			0, _upd_ofs, _upd, CLK_SET_RATE_PARENT,		\
 			mtk_mux_clr_set_upd_ops)
 
+#define MUX_GATE_FENC_CLR_SET_UPD_FLAGS(_id, _name, _parents, _paridx,		\
+			_num_parents, _mux_ofs, _mux_set_ofs, _mux_clr_ofs,	\
+			_shift, _width, _gate, _upd_ofs, _upd,			\
+			_fenc_sta_mon_ofs, _fenc, _flags) {			\
+		.id = _id,							\
+		.name = _name,							\
+		.mux_ofs = _mux_ofs,						\
+		.set_ofs = _mux_set_ofs,					\
+		.clr_ofs = _mux_clr_ofs,					\
+		.upd_ofs = _upd_ofs,						\
+		.fenc_sta_mon_ofs = _fenc_sta_mon_ofs,				\
+		.mux_shift = _shift,						\
+		.mux_width = _width,						\
+		.gate_shift = _gate,						\
+		.upd_shift = _upd,						\
+		.fenc_shift = _fenc,						\
+		.parent_names = _parents,					\
+		.parent_index = _paridx,					\
+		.num_parents = _num_parents,					\
+		.flags = _flags,						\
+		.ops = &mtk_mux_gate_fenc_clr_set_upd_ops,			\
+	}
+
+#define MUX_GATE_FENC_CLR_SET_UPD(_id, _name, _parents,			\
+			_mux_ofs, _mux_set_ofs, _mux_clr_ofs,		\
+			_shift, _width, _gate, _upd_ofs, _upd,		\
+			_fenc_sta_mon_ofs, _fenc)			\
+		MUX_GATE_FENC_CLR_SET_UPD_FLAGS(_id, _name, _parents,	\
+			NULL, ARRAY_SIZE(_parents), _mux_ofs,		\
+			_mux_set_ofs, _mux_clr_ofs, _shift,		\
+			_width, _gate, _upd_ofs, _upd,			\
+			_fenc_sta_mon_ofs, _fenc, 0)
+
+#define MUX_GATE_FENC_CLR_SET_UPD_INDEXED(_id, _name, _parents, _paridx,	\
+			_mux_ofs, _mux_set_ofs, _mux_clr_ofs,			\
+			_shift, _width, _gate, _upd_ofs, _upd,			\
+			_fenc_sta_mon_ofs, _fenc)				\
+		MUX_GATE_FENC_CLR_SET_UPD_FLAGS(_id, _name, _parents, _paridx,	\
+			ARRAY_SIZE(_paridx), _mux_ofs, _mux_set_ofs,		\
+			_mux_clr_ofs, _shift, _width, _gate, _upd_ofs, _upd,	\
+			_fenc_sta_mon_ofs, _fenc, 0)
+
 int mtk_clk_register_muxes(struct device *dev,
 			   const struct mtk_mux *muxes,
 			   int num, struct device_node *node,