linux_kernel/drivers/gpu/ipu-v3/ipu-smfc.c

/*
 * 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
 */
#define DEBUG
#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_priv {
	void __iomem *base;
	spinlock_t lock;
};

/*SMFC Registers */
#define SMFC_MAP	0x0000
#define SMFC_WMC	0x0004
#define SMFC_BS		0x0008

int ipu_smfc_set_burstsize(struct ipu_soc *ipu, int channel, int burstsize)
{
	struct ipu_smfc_priv *smfc = ipu->smfc_priv;
	unsigned long flags;
	u32 val, shift;

	spin_lock_irqsave(&smfc->lock, flags);

	shift = channel * 4;
	val = readl(smfc->base + SMFC_BS);
	val &= ~(0xf << shift);
	val |= burstsize << shift;
	writel(val, smfc->base + SMFC_BS);

	spin_unlock_irqrestore(&smfc->lock, flags);

	return 0;
}
EXPORT_SYMBOL_GPL(ipu_smfc_set_burstsize);

int ipu_smfc_map_channel(struct ipu_soc *ipu, int channel, int csi_id, int mipi_id)
{
	struct ipu_smfc_priv *smfc = ipu->smfc_priv;
	unsigned long flags;
	u32 val, shift;

	spin_lock_irqsave(&smfc->lock, flags);

	shift = channel * 3;
	val = readl(smfc->base + SMFC_MAP);
	val &= ~(0x7 << shift);
	val |= ((csi_id << 2) | mipi_id) << shift;
	writel(val, smfc->base + SMFC_MAP);

	spin_unlock_irqrestore(&smfc->lock, flags);

	return 0;
}
EXPORT_SYMBOL_GPL(ipu_smfc_map_channel);

int ipu_smfc_init(struct ipu_soc *ipu, struct device *dev,
		  unsigned long base)
{
	struct ipu_smfc_priv *smfc;

	smfc = devm_kzalloc(dev, sizeof(*smfc), GFP_KERNEL);
	if (!smfc)
		return -ENOMEM;

	ipu->smfc_priv = smfc;
	spin_lock_init(&smfc->lock);

	smfc->base = devm_ioremap(dev, base, PAGE_SIZE);
	if (!smfc->base)
		return -ENOMEM;

	pr_debug("%s: ioremap 0x%08lx -> %p\n", __func__, base, smfc->base);

	return 0;
}

void ipu_smfc_exit(struct ipu_soc *ipu)
{
}