+int ipu_smfc_set_watermark(struct ipu_smfc *smfc, u32 set_level, u32 clr_level)
+{
+ struct ipu_smfc_priv *priv = smfc->priv;
+ unsigned long flags;
+ u32 val, shift;
+
+ spin_lock_irqsave(&priv->lock, flags);
+
+ shift = smfc->chno * 6 + (smfc->chno > 1 ? 4 : 0);
+ val = readl(priv->base + SMFC_WMC);
+ val &= ~(0x3f << shift);
+ val |= ((clr_level << 3) | set_level) << shift;
+ writel(val, priv->base + SMFC_WMC);
+
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ipu_smfc_set_watermark);
+
+int ipu_smfc_enable(struct ipu_smfc *smfc)
+{
+ struct ipu_smfc_priv *priv = smfc->priv;
+ unsigned long flags;
+
+ spin_lock_irqsave(&priv->lock, flags);
+
+ if (!priv->use_count)
+ ipu_module_enable(priv->ipu, IPU_CONF_SMFC_EN);
+
+ priv->use_count++;
+
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ipu_smfc_enable);
+
+int ipu_smfc_disable(struct ipu_smfc *smfc)
+{
+ struct ipu_smfc_priv *priv = smfc->priv;
+ unsigned long flags;
+
+ spin_lock_irqsave(&priv->lock, flags);
+
+ priv->use_count--;
+
+ if (!priv->use_count)
+ ipu_module_disable(priv->ipu, IPU_CONF_SMFC_EN);
+
+ if (priv->use_count < 0)
+ priv->use_count = 0;
+
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ipu_smfc_disable);
+
+struct ipu_smfc *ipu_smfc_get(struct ipu_soc *ipu, unsigned int chno)
+{
+ struct ipu_smfc_priv *priv = ipu->smfc_priv;
+ struct ipu_smfc *smfc, *ret;
+ unsigned long flags;
+
+ if (chno >= 4)
+ return ERR_PTR(-EINVAL);
+
+ smfc = &priv->channel[chno];
+ ret = smfc;
+
+ spin_lock_irqsave(&priv->lock, flags);
+
+ if (smfc->inuse) {
+ ret = ERR_PTR(-EBUSY);
+ goto unlock;
+ }
+
+ smfc->inuse = true;
+unlock:
+ spin_unlock_irqrestore(&priv->lock, flags);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(ipu_smfc_get);
+
+void ipu_smfc_put(struct ipu_smfc *smfc)
+{
+ struct ipu_smfc_priv *priv = smfc->priv;
+ unsigned long flags;
+
+ spin_lock_irqsave(&priv->lock, flags);
+ smfc->inuse = false;
+ spin_unlock_irqrestore(&priv->lock, flags);
+}
+EXPORT_SYMBOL_GPL(ipu_smfc_put);
+