1 files changed, 0 insertions, 371 deletions
diff --git a/drivers/iommu/tegra-gart.c b/drivers/iommu/tegra-gart.c
deleted file mode 100644
index a482ff838b..0000000000
--- a/drivers/iommu/tegra-gart.c
+++ /dev/null
@@ -1,371 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * IOMMU API for Graphics Address Relocation Table on Tegra20
- *
- * Copyright (c) 2010-2012, NVIDIA CORPORATION.  All rights reserved.
- *
- * Author: Hiroshi DOYU <hdoyu@nvidia.com>
- */
-
-#define dev_fmt(fmt)	"gart: " fmt
-
-#include <linux/io.h>
-#include <linux/iommu.h>
-#include <linux/moduleparam.h>
-#include <linux/platform_device.h>
-#include <linux/slab.h>
-#include <linux/spinlock.h>
-#include <linux/vmalloc.h>
-
-#include <soc/tegra/mc.h>
-
-#define GART_REG_BASE		0x24
-#define GART_CONFIG		(0x24 - GART_REG_BASE)
-#define GART_ENTRY_ADDR		(0x28 - GART_REG_BASE)
-#define GART_ENTRY_DATA		(0x2c - GART_REG_BASE)
-
-#define GART_ENTRY_PHYS_ADDR_VALID	BIT(31)
-
-#define GART_PAGE_SHIFT		12
-#define GART_PAGE_SIZE		(1 << GART_PAGE_SHIFT)
-#define GART_PAGE_MASK		GENMASK(30, GART_PAGE_SHIFT)
-
-/* bitmap of the page sizes currently supported */
-#define GART_IOMMU_PGSIZES	(GART_PAGE_SIZE)
-
-struct gart_device {
-	void __iomem		*regs;
-	u32			*savedata;
-	unsigned long		iovmm_base;	/* offset to vmm_area start */
-	unsigned long		iovmm_end;	/* offset to vmm_area end */
-	spinlock_t		pte_lock;	/* for pagetable */
-	spinlock_t		dom_lock;	/* for active domain */
-	unsigned int		active_devices;	/* number of active devices */
-	struct iommu_domain	*active_domain;	/* current active domain */
-	struct iommu_device	iommu;		/* IOMMU Core handle */
-	struct device		*dev;
-};
-
-static struct gart_device *gart_handle; /* unique for a system */
-
-static bool gart_debug;
-
-/*
- * Any interaction between any block on PPSB and a block on APB or AHB
- * must have these read-back to ensure the APB/AHB bus transaction is
- * complete before initiating activity on the PPSB block.
- */
-#define FLUSH_GART_REGS(gart)	readl_relaxed((gart)->regs + GART_CONFIG)
-
-#define for_each_gart_pte(gart, iova)					\
-	for (iova = gart->iovmm_base;					\
-	     iova < gart->iovmm_end;					\
-	     iova += GART_PAGE_SIZE)
-
-static inline void gart_set_pte(struct gart_device *gart,
-				unsigned long iova, unsigned long pte)
-{
-	writel_relaxed(iova, gart->regs + GART_ENTRY_ADDR);
-	writel_relaxed(pte, gart->regs + GART_ENTRY_DATA);
-}
-
-static inline unsigned long gart_read_pte(struct gart_device *gart,
-					  unsigned long iova)
-{
-	unsigned long pte;
-
-	writel_relaxed(iova, gart->regs + GART_ENTRY_ADDR);
-	pte = readl_relaxed(gart->regs + GART_ENTRY_DATA);
-
-	return pte;
-}
-
-static void do_gart_setup(struct gart_device *gart, const u32 *data)
-{
-	unsigned long iova;
-
-	for_each_gart_pte(gart, iova)
-		gart_set_pte(gart, iova, data ? *(data++) : 0);
-
-	writel_relaxed(1, gart->regs + GART_CONFIG);
-	FLUSH_GART_REGS(gart);
-}
-
-static inline bool gart_iova_range_invalid(struct gart_device *gart,
-					   unsigned long iova, size_t bytes)
-{
-	return unlikely(iova < gart->iovmm_base || bytes != GART_PAGE_SIZE ||
-			iova + bytes > gart->iovmm_end);
-}
-
-static inline bool gart_pte_valid(struct gart_device *gart, unsigned long iova)
-{
-	return !!(gart_read_pte(gart, iova) & GART_ENTRY_PHYS_ADDR_VALID);
-}
-
-static int gart_iommu_attach_dev(struct iommu_domain *domain,
-				 struct device *dev)
-{
-	struct gart_device *gart = gart_handle;
-	int ret = 0;
-
-	spin_lock(&gart->dom_lock);
-
-	if (gart->active_domain && gart->active_domain != domain) {
-		ret = -EINVAL;
-	} else if (dev_iommu_priv_get(dev) != domain) {
-		dev_iommu_priv_set(dev, domain);
-		gart->active_domain = domain;
-		gart->active_devices++;
-	}
-
-	spin_unlock(&gart->dom_lock);
-
-	return ret;
-}
-
-static void gart_iommu_set_platform_dma(struct device *dev)
-{
-	struct iommu_domain *domain = iommu_get_domain_for_dev(dev);
-	struct gart_device *gart = gart_handle;
-
-	spin_lock(&gart->dom_lock);
-
-	if (dev_iommu_priv_get(dev) == domain) {
-		dev_iommu_priv_set(dev, NULL);
-
-		if (--gart->active_devices == 0)
-			gart->active_domain = NULL;
-	}
-
-	spin_unlock(&gart->dom_lock);
-}
-
-static struct iommu_domain *gart_iommu_domain_alloc(unsigned type)
-{
-	struct iommu_domain *domain;
-
-	if (type != IOMMU_DOMAIN_UNMANAGED)
-		return NULL;
-
-	domain = kzalloc(sizeof(*domain), GFP_KERNEL);
-	if (domain) {
-		domain->geometry.aperture_start = gart_handle->iovmm_base;
-		domain->geometry.aperture_end = gart_handle->iovmm_end - 1;
-		domain->geometry.force_aperture = true;
-	}
-
-	return domain;
-}
-
-static void gart_iommu_domain_free(struct iommu_domain *domain)
-{
-	WARN_ON(gart_handle->active_domain == domain);
-	kfree(domain);
-}
-
-static inline int __gart_iommu_map(struct gart_device *gart, unsigned long iova,
-				   unsigned long pa)
-{
-	if (unlikely(gart_debug && gart_pte_valid(gart, iova))) {
-		dev_err(gart->dev, "Page entry is in-use\n");
-		return -EINVAL;
-	}
-
-	gart_set_pte(gart, iova, GART_ENTRY_PHYS_ADDR_VALID | pa);
-
-	return 0;
-}
-
-static int gart_iommu_map(struct iommu_domain *domain, unsigned long iova,
-			  phys_addr_t pa, size_t bytes, int prot, gfp_t gfp)
-{
-	struct gart_device *gart = gart_handle;
-	int ret;
-
-	if (gart_iova_range_invalid(gart, iova, bytes))
-		return -EINVAL;
-
-	spin_lock(&gart->pte_lock);
-	ret = __gart_iommu_map(gart, iova, (unsigned long)pa);
-	spin_unlock(&gart->pte_lock);
-
-	return ret;
-}
-
-static inline int __gart_iommu_unmap(struct gart_device *gart,
-				     unsigned long iova)
-{
-	if (unlikely(gart_debug && !gart_pte_valid(gart, iova))) {
-		dev_err(gart->dev, "Page entry is invalid\n");
-		return -EINVAL;
-	}
-
-	gart_set_pte(gart, iova, 0);
-
-	return 0;
-}
-
-static size_t gart_iommu_unmap(struct iommu_domain *domain, unsigned long iova,
-			       size_t bytes, struct iommu_iotlb_gather *gather)
-{
-	struct gart_device *gart = gart_handle;
-	int err;
-
-	if (gart_iova_range_invalid(gart, iova, bytes))
-		return 0;
-
-	spin_lock(&gart->pte_lock);
-	err = __gart_iommu_unmap(gart, iova);
-	spin_unlock(&gart->pte_lock);
-
-	return err ? 0 : bytes;
-}
-
-static phys_addr_t gart_iommu_iova_to_phys(struct iommu_domain *domain,
-					   dma_addr_t iova)
-{
-	struct gart_device *gart = gart_handle;
-	unsigned long pte;
-
-	if (gart_iova_range_invalid(gart, iova, GART_PAGE_SIZE))
-		return -EINVAL;
-
-	spin_lock(&gart->pte_lock);
-	pte = gart_read_pte(gart, iova);
-	spin_unlock(&gart->pte_lock);
-
-	return pte & GART_PAGE_MASK;
-}
-
-static struct iommu_device *gart_iommu_probe_device(struct device *dev)
-{
-	if (!dev_iommu_fwspec_get(dev))
-		return ERR_PTR(-ENODEV);
-
-	return &gart_handle->iommu;
-}
-
-static int gart_iommu_of_xlate(struct device *dev,
-			       struct of_phandle_args *args)
-{
-	return 0;
-}
-
-static void gart_iommu_sync_map(struct iommu_domain *domain, unsigned long iova,
-				size_t size)
-{
-	FLUSH_GART_REGS(gart_handle);
-}
-
-static void gart_iommu_sync(struct iommu_domain *domain,
-			    struct iommu_iotlb_gather *gather)
-{
-	size_t length = gather->end - gather->start + 1;
-
-	gart_iommu_sync_map(domain, gather->start, length);
-}
-
-static const struct iommu_ops gart_iommu_ops = {
-	.domain_alloc	= gart_iommu_domain_alloc,
-	.probe_device	= gart_iommu_probe_device,
-	.device_group	= generic_device_group,
-	.set_platform_dma_ops = gart_iommu_set_platform_dma,
-	.pgsize_bitmap	= GART_IOMMU_PGSIZES,
-	.of_xlate	= gart_iommu_of_xlate,
-	.default_domain_ops = &(const struct iommu_domain_ops) {
-		.attach_dev	= gart_iommu_attach_dev,
-		.map		= gart_iommu_map,
-		.unmap		= gart_iommu_unmap,
-		.iova_to_phys	= gart_iommu_iova_to_phys,
-		.iotlb_sync_map	= gart_iommu_sync_map,
-		.iotlb_sync	= gart_iommu_sync,
-		.free		= gart_iommu_domain_free,
-	}
-};
-
-int tegra_gart_suspend(struct gart_device *gart)
-{
-	u32 *data = gart->savedata;
-	unsigned long iova;
-
-	/*
-	 * All GART users shall be suspended at this point. Disable
-	 * address translation to trap all GART accesses as invalid
-	 * memory accesses.
-	 */
-	writel_relaxed(0, gart->regs + GART_CONFIG);
-	FLUSH_GART_REGS(gart);
-
-	for_each_gart_pte(gart, iova)
-		*(data++) = gart_read_pte(gart, iova);
-
-	return 0;
-}
-
-int tegra_gart_resume(struct gart_device *gart)
-{
-	do_gart_setup(gart, gart->savedata);
-
-	return 0;
-}
-
-struct gart_device *tegra_gart_probe(struct device *dev, struct tegra_mc *mc)
-{
-	struct gart_device *gart;
-	struct resource *res;
-	int err;
-
-	BUILD_BUG_ON(PAGE_SHIFT != GART_PAGE_SHIFT);
-
-	/* the GART memory aperture is required */
-	res = platform_get_resource(to_platform_device(dev), IORESOURCE_MEM, 1);
-	if (!res) {
-		dev_err(dev, "Memory aperture resource unavailable\n");
-		return ERR_PTR(-ENXIO);
-	}
-
-	gart = kzalloc(sizeof(*gart), GFP_KERNEL);
-	if (!gart)
-		return ERR_PTR(-ENOMEM);
-
-	gart_handle = gart;
-
-	gart->dev = dev;
-	gart->regs = mc->regs + GART_REG_BASE;
-	gart->iovmm_base = res->start;
-	gart->iovmm_end = res->end + 1;
-	spin_lock_init(&gart->pte_lock);
-	spin_lock_init(&gart->dom_lock);
-
-	do_gart_setup(gart, NULL);
-
-	err = iommu_device_sysfs_add(&gart->iommu, dev, NULL, "gart");
-	if (err)
-		goto free_gart;
-
-	err = iommu_device_register(&gart->iommu, &gart_iommu_ops, dev);
-	if (err)
-		goto remove_sysfs;
-
-	gart->savedata = vmalloc(resource_size(res) / GART_PAGE_SIZE *
-				 sizeof(u32));
-	if (!gart->savedata) {
-		err = -ENOMEM;
-		goto unregister_iommu;
-	}
-
-	return gart;
-
-unregister_iommu:
-	iommu_device_unregister(&gart->iommu);
-remove_sysfs:
-	iommu_device_sysfs_remove(&gart->iommu);
-free_gart:
-	kfree(gart);
-
-	return ERR_PTR(err);
-}
-
-module_param(gart_debug, bool, 0644);
-MODULE_PARM_DESC(gart_debug, "Enable GART debugging");