path: root/arch/arm/plat-omap/iommu.c

/*
 * omap iommu: tlb and pagetable primitives
 *
 * Copyright (C) 2008-2010 Nokia Corporation
 *
 * Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.com>,
 *		Paul Mundt and Toshihiro Kobayashi
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/err.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/clk.h>
#include <linux/platform_device.h>

#include <asm/cacheflush.h>

#include <plat/iommu.h>

#include "iopgtable.h"

#define for_each_iotlb_cr(obj, n, __i, cr)				\
	for (__i = 0;							\
	     (__i < (n)) && (cr = __iotlb_read_cr((obj), __i), true);	\
	     __i++)

/* accommodate the difference between omap1 and omap2/3 */
static const struct iommu_functions *arch_iommu;

static struct platform_driver omap_iommu_driver;
static struct kmem_cache *iopte_cachep;

/**
 * install_iommu_arch - Install archtecure specific iommu functions
 * @ops:	a pointer to architecture specific iommu functions
 *
 * There are several kind of iommu algorithm(tlb, pagetable) among
 * omap series. This interface installs such an iommu algorighm.
 **/
int install_iommu_arch(const struct iommu_functions *ops)
{
	if (arch_iommu)
		return -EBUSY;

	arch_iommu = ops;
	return 0;
}
EXPORT_SYMBOL_GPL(install_iommu_arch);

/**
 * uninstall_iommu_arch - Uninstall archtecure specific iommu functions
 * @ops:	a pointer to architecture specific iommu functions
 *
 * This interface uninstalls the iommu algorighm installed previously.
 **/
void uninstall_iommu_arch(const struct iommu_functions *ops)
{
	if (arch_iommu != ops)
		pr_err("%s: not your arch\n", __func__);

	arch_iommu = NULL;
}
EXPORT_SYMBOL_GPL(uninstall_iommu_arch);

/**
 * iommu_save_ctx - Save registers for pm off-mode support
 * @obj:	target iommu
 **/
void iommu_save_ctx(struct iommu *obj)
{
	arch_iommu->save_ctx(obj);
}
EXPORT_SYMBOL_GPL(iommu_save_ctx);

/**
 * iommu_restore_ctx - Restore registers for pm off-mode support
 * @obj:	target iommu
 **/
void iommu_restore_ctx(struct iommu *obj)
{
	arch_iommu->restore_ctx(obj);
}
EXPORT_SYMBOL_GPL(iommu_restore_ctx);

/**
 * iommu_arch_version - Return running iommu arch version
 **/
u32 iommu_arch_version(void)
{
	return arch_iommu->version;
}
EXPORT_SYMBOL_GPL(iommu_arch_version);

static int iommu_enable(struct iommu *obj)
{
	int err;

	if (!obj)
		return -EINVAL;

	clk_enable(obj->clk);

	err = arch_iommu->enable(obj);

	clk_disable(obj->clk);
	return err;
}

static void iommu_disable(struct iommu *obj)
{
	if (!obj)
		return;

	clk_enable(obj->clk);

	arch_iommu->disable(obj);

	clk_disable(obj->clk);
}

/*
 *	TLB operations
 */
void iotlb_cr_to_e(struct cr_regs *cr, struct iotlb_entry *e)
{
	BUG_ON(!cr || !e);

	arch_iommu->cr_to_e(cr, e);
}
EXPORT_SYMBOL_GPL(iotlb_cr_to_e);

static inline int iotlb_cr_valid(struct cr_regs *cr)
{
	if (!cr)
		return -EINVAL;

	return arch_iommu->cr_valid(cr);
}

static inline struct cr_regs *iotlb_alloc_cr(struct iommu *obj,
					     struct iotlb_entry *e)
{
	if (!e)
		return NULL;

	return arch_iommu->alloc_cr(obj, e);
}

u32 iotlb_cr_to_virt(struct cr_regs *cr)
{
	return arch_iommu->cr_to_virt(cr);
}
EXPORT_SYMBOL_GPL(iotlb_cr_to_virt);

static u32 get_iopte_attr(struct iotlb_entry *e)
{
	return arch_iommu->get_pte_attr(e);
}

static u32 iommu_report_fault(struct iommu *obj, u32 *da)
{
	return arch_iommu->fault_isr(obj, da);
}

static void iotlb_lock_get(struct iommu *obj, struct iotlb_lock *l)
{
	u32 val;

	val = iommu_read_reg(obj, MMU_LOCK);

	l->base = MMU_LOCK_BASE(val);
	l->vict = MMU_LOCK_VICT(val);

}

static void iotlb_lock_set(struct iommu *obj, struct iotlb_lock *l)
{
	u32 val;

	val = (l->base << MMU_LOCK_BASE_SHIFT);
	val |= (l->vict << MMU_LOCK_VICT_SHIFT);

	iommu_write_reg(obj, val, MMU_LOCK);
}

static void iotlb_read_cr(struct iommu *obj, struct cr_regs *cr)