[PATCH v3 3/9] soc: mediatek: cmdq: Add cmdq_pkt_logic_command to support math operation

[Jason-JH.Lin <jason-jh.lin@mediatek.com>]

Add cmdq_pkt_logic_command to support math operation.

cmdq_pkt_logic_command can append logic command to the CMDQ packet,
ask GCE to execute a arithmetic calculate instruction,
such as add, subtract, multiply, AND, OR and NOT, etc.

Note that all arithmetic instructions are unsigned calculations.
If there are any overflows, GCE will sent the invalid IRQ to notify
CMDQ driver.

Signed-off-by: Jason-JH.Lin <jason-jh.lin@mediatek.com>
---
 drivers/soc/mediatek/mtk-cmdq-helper.c | 36 ++++++++++++++++++++++
 include/linux/soc/mediatek/mtk-cmdq.h  | 42 ++++++++++++++++++++++++++
 2 files changed, 78 insertions(+)

diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c b/drivers/soc/mediatek/mtk-cmdq-helper.c
index b0cd071c4719..60f8ecbab5e7 100644
--- a/drivers/soc/mediatek/mtk-cmdq-helper.c
+++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
@@ -13,9 +13,18 @@
 #define CMDQ_WRITE_ENABLE_MASK	BIT(0)
 #define CMDQ_POLL_ENABLE_MASK	BIT(0)
 #define CMDQ_EOC_IRQ_EN		BIT(0)
+#define CMDQ_IMMEDIATE_VALUE	0
 #define CMDQ_REG_TYPE		1
 #define CMDQ_JUMP_RELATIVE	1
 
+#define CMDQ_OPERAND_GET_IDX_VALUE(operand) \
+	({ \
+		struct cmdq_operand *op = operand; \
+		op->reg ? op->idx : op->value; \
+	})
+#define CMDQ_OPERAND_TYPE(operand) \
+	((operand)->reg ? CMDQ_REG_TYPE : CMDQ_IMMEDIATE_VALUE)
+
 struct cmdq_instruction {
 	union {
 		u32 value;
@@ -380,6 +389,33 @@ int cmdq_pkt_poll_mask(struct cmdq_pkt *pkt, u8 subsys,
 }
 EXPORT_SYMBOL(cmdq_pkt_poll_mask);
 
+int cmdq_pkt_logic_command(struct cmdq_pkt *pkt, u16 result_reg_idx,
+			   struct cmdq_operand *left_operand,
+			   enum cmdq_logic_op s_op,
+			   struct cmdq_operand *right_operand)
+{
+	struct cmdq_instruction inst = { {0} };
+	u32 left_idx_value;
+	u32 right_idx_value;
+
+	if (!left_operand || !right_operand || s_op >= CMDQ_LOGIC_MAX)
+		return -EINVAL;
+
+	left_idx_value = CMDQ_OPERAND_GET_IDX_VALUE(left_operand);
+	right_idx_value = CMDQ_OPERAND_GET_IDX_VALUE(right_operand);
+	inst.op = CMDQ_CODE_LOGIC;
+	inst.dst_t = CMDQ_REG_TYPE;
+	inst.src_t = CMDQ_OPERAND_TYPE(left_operand);
+	inst.arg_c_t = CMDQ_OPERAND_TYPE(right_operand);
+	inst.sop = s_op;
+	inst.arg_c = right_idx_value;
+	inst.src_reg = left_idx_value;
+	inst.reg_dst = result_reg_idx;
+
+	return cmdq_pkt_append_command(pkt, inst);
+}
+EXPORT_SYMBOL(cmdq_pkt_logic_command);
+
 int cmdq_pkt_assign(struct cmdq_pkt *pkt, u16 reg_idx, u32 value)
 {
 	struct cmdq_instruction inst = {};
diff --git a/include/linux/soc/mediatek/mtk-cmdq.h b/include/linux/soc/mediatek/mtk-cmdq.h
index a253c001c861..73eadda1dd2d 100644
--- a/include/linux/soc/mediatek/mtk-cmdq.h
+++ b/include/linux/soc/mediatek/mtk-cmdq.h
@@ -26,6 +26,31 @@
 
 struct cmdq_pkt;
 
+enum cmdq_logic_op {
+	CMDQ_LOGIC_ASSIGN = 0,
+	CMDQ_LOGIC_ADD = 1,
+	CMDQ_LOGIC_SUBTRACT = 2,
+	CMDQ_LOGIC_MULTIPLY = 3,
+	CMDQ_LOGIC_XOR = 8,
+	CMDQ_LOGIC_NOT = 9,
+	CMDQ_LOGIC_OR = 10,
+	CMDQ_LOGIC_AND = 11,
+	CMDQ_LOGIC_LEFT_SHIFT = 12,
+	CMDQ_LOGIC_RIGHT_SHIFT = 13,
+	CMDQ_LOGIC_MAX,
+};
+
+struct cmdq_operand {
+	/* register type */
+	bool reg;
+	union {
+		/* index */
+		u16 idx;
+		/* value */
+		u16 value;
+	};
+};
+
 struct cmdq_client_reg {
 	u8 subsys;
 	u16 offset;
@@ -244,6 +269,23 @@ int cmdq_pkt_poll(struct cmdq_pkt *pkt, u8 subsys,
 int cmdq_pkt_poll_mask(struct cmdq_pkt *pkt, u8 subsys,
 		       u16 offset, u32 value, u32 mask);
 
+/**
+ * cmdq_pkt_logic_command() - Append logic command to the CMDQ packet, ask GCE to
+ *		          execute an instruction that store the result of logic operation
+ *		          with left and right operand into result_reg_idx.
+ * @pkt:		the CMDQ packet
+ * @result_reg_idx:	SPR index that store operation result of left_operand and right_operand
+ * @left_operand:	left operand
+ * @s_op:		the logic operator enum
+ * @right_operand:	right operand
+ *
+ * Return: 0 for success; else the error code is returned
+ */
+int cmdq_pkt_logic_command(struct cmdq_pkt *pkt, u16 result_reg_idx,
+			   struct cmdq_operand *left_operand,
+			   enum cmdq_logic_op s_op,
+			   struct cmdq_operand *right_operand);
+
 /**
  * cmdq_pkt_assign() - Append logic assign command to the CMDQ packet, ask GCE
  *		       to execute an instruction that set a constant value into
-- 
2.18.0