wifi: rtw88: refine register based H2C command

Since register based H2C commands don't need endian conversion.
Introduce a new API that don't do conversion and send it directly.
New caller are expected to encode with cpu order and gradually
replace the old ones.
Signed-off-by: Po-Hao Huang <phhuang@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20230616125540.36877-6-pkshih@realtek.com

drivers/net/wireless/realtek/rtw88/fw.c

@@ -308,6 +308,57 @@ void rtw_fw_c2h_cmd_isr(struct rtw_dev *rtwdev)
 }
 EXPORT_SYMBOL(rtw_fw_c2h_cmd_isr);
 
+static void rtw_fw_send_h2c_command_register(struct rtw_dev *rtwdev,
+					     struct rtw_h2c_register *h2c)
+{
+	u32 box_reg, box_ex_reg;
+	u8 box_state, box;
+	int ret;
+
+	rtw_dbg(rtwdev, RTW_DBG_FW, "send H2C content %08x %08x\n", h2c->w0,
+		h2c->w1);
+
+	lockdep_assert_held(&rtwdev->mutex);
+
+	box = rtwdev->h2c.last_box_num;
+	switch (box) {
+	case 0:
+		box_reg = REG_HMEBOX0;
+		box_ex_reg = REG_HMEBOX0_EX;
+		break;
+	case 1:
+		box_reg = REG_HMEBOX1;
+		box_ex_reg = REG_HMEBOX1_EX;
+		break;
+	case 2:
+		box_reg = REG_HMEBOX2;
+		box_ex_reg = REG_HMEBOX2_EX;
+		break;
+	case 3:
+		box_reg = REG_HMEBOX3;
+		box_ex_reg = REG_HMEBOX3_EX;
+		break;
+	default:
+		WARN(1, "invalid h2c mail box number\n");
+		return;
+	}
+
+	ret = read_poll_timeout_atomic(rtw_read8, box_state,
+				       !((box_state >> box) & 0x1), 100, 3000,
+				       false, rtwdev, REG_HMETFR);
+
+	if (ret) {
+		rtw_err(rtwdev, "failed to send h2c command\n");
+		return;
+	}
+
+	rtw_write32(rtwdev, box_ex_reg, h2c->w1);
+	rtw_write32(rtwdev, box_reg, h2c->w0);
+
+	if (++rtwdev->h2c.last_box_num >= 4)
+		rtwdev->h2c.last_box_num = 0;
+}
+
 static void rtw_fw_send_h2c_command(struct rtw_dev *rtwdev,
 				    u8 *h2c)
 {

drivers/net/wireless/realtek/rtw88/fw.h

@@ -81,6 +81,11 @@ struct rtw_c2h_adaptivity {
 	u8 option;
 } __packed;
 
+struct rtw_h2c_register {
+	u32 w0;
+	u32 w1;
+} __packed;
+
 struct rtw_h2c_cmd {
 	__le32 msg;
 	__le32 msg_ext;