/*
   * Copyright 2008-2010 Freescale Semiconductor, Inc. All Rights Reserved.
   *
   * The code contained herein is licensed under the GNU General Public
   * License. You may obtain a copy of the GNU General Public License
   * Version 2 or later at the following locations:
   *
   * http://www.opensource.org/licenses/gpl-license.html
   * http://www.gnu.org/copyleft/gpl.html
   */
  #include <linux/export.h>
  #include <linux/types.h>
  #include <linux/init.h>
  #include <linux/io.h>
  #include <linux/errno.h>
  #include <linux/spinlock.h>
  #include <linux/delay.h>
  #include <linux/clk.h>
  #include <video/imx-ipu-v3.h>
  
  #include "ipu-prv.h"
  
  struct ipu_smfc {
  	struct ipu_smfc_priv *priv;
  	int chno;
  	bool inuse;
  };
  
  struct ipu_smfc_priv {
  	void __iomem *base;
  	spinlock_t lock;
  	struct ipu_soc *ipu;
  	struct ipu_smfc channel[4];
  	int use_count;
  };
  
  /*SMFC Registers */
  #define SMFC_MAP	0x0000
  #define SMFC_WMC	0x0004
  #define SMFC_BS		0x0008
  
  int ipu_smfc_set_burstsize(struct ipu_smfc *smfc, int burstsize)
  {
  	struct ipu_smfc_priv *priv = smfc->priv;
  	unsigned long flags;
  	u32 val, shift;
  
  	spin_lock_irqsave(&priv->lock, flags);
  
  	shift = smfc->chno * 4;
  	val = readl(priv->base + SMFC_BS);
  	val &= ~(0xf << shift);
  	val |= burstsize << shift;
  	writel(val, priv->base + SMFC_BS);
  
  	spin_unlock_irqrestore(&priv->lock, flags);
  
  	return 0;
  }
  EXPORT_SYMBOL_GPL(ipu_smfc_set_burstsize);
  
  int ipu_smfc_map_channel(struct ipu_smfc *smfc, int csi_id, int mipi_id)
  {
  	struct ipu_smfc_priv *priv = smfc->priv;
  	unsigned long flags;
  	u32 val, shift;
  
  	spin_lock_irqsave(&priv->lock, flags);
  
  	shift = smfc->chno * 3;
  	val = readl(priv->base + SMFC_MAP);
  	val &= ~(0x7 << shift);
  	val |= ((csi_id << 2) | mipi_id) << shift;
  	writel(val, priv->base + SMFC_MAP);
  
  	spin_unlock_irqrestore(&priv->lock, flags);
  
  	return 0;
  }
  EXPORT_SYMBOL_GPL(ipu_smfc_map_channel);
  
  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);
  
  int ipu_smfc_init(struct ipu_soc *ipu, struct device *dev,
  		  unsigned long base)
  {
  	struct ipu_smfc_priv *priv;
  	int i;
  
  	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
  	if (!priv)
  		return -ENOMEM;
  
  	ipu->smfc_priv = priv;
  	spin_lock_init(&priv->lock);
  	priv->ipu = ipu;
  
  	priv->base = devm_ioremap(dev, base, PAGE_SIZE);
  	if (!priv->base)
  		return -ENOMEM;
  
  	for (i = 0; i < 4; i++) {
  		priv->channel[i].priv = priv;
  		priv->channel[i].chno = i;
  	}
  
  	pr_debug("%s: ioremap 0x%08lx -> %p
  ", __func__, base, priv->base);
  
  	return 0;
  }
  
  void ipu_smfc_exit(struct ipu_soc *ipu)
  {
  }