1 files changed, 0 insertions, 511 deletions
diff --git a/drivers/iommu/tegra-gart.c b/drivers/iommu/tegra-gart.c
deleted file mode 100644
index da6a4e357b2b..000000000000
--- a/drivers/iommu/tegra-gart.c
+++ /dev/null
@@ -1,511 +0,0 @@
-/*
- * IOMMU API for GART in Tegra20
- *
- * Copyright (c) 2010-2012, NVIDIA CORPORATION.  All rights reserved.
- *
- * Author: Hiroshi DOYU <hdoyu@nvidia.com>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along with
- * this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
- */
-
-#define pr_fmt(fmt)	"%s(): " fmt, __func__
-
-#include <linux/init.h>
-#include <linux/moduleparam.h>
-#include <linux/platform_device.h>
-#include <linux/spinlock.h>
-#include <linux/slab.h>
-#include <linux/vmalloc.h>
-#include <linux/mm.h>
-#include <linux/list.h>
-#include <linux/device.h>
-#include <linux/io.h>
-#include <linux/iommu.h>
-#include <linux/of.h>
-
-#include <asm/cacheflush.h>
-
-/* bitmap of the page sizes currently supported */
-#define GART_IOMMU_PGSIZES	(SZ_4K)
-
-#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	(1 << 31)
-
-#define GART_PAGE_SHIFT		12
-#define GART_PAGE_SIZE		(1 << GART_PAGE_SHIFT)
-#define GART_PAGE_MASK						\
-	(~(GART_PAGE_SIZE - 1) & ~GART_ENTRY_PHYS_ADDR_VALID)
-
-struct gart_client {
-	struct device		*dev;
-	struct list_head	list;
-};
-
-struct gart_device {
-	void __iomem		*regs;
-	u32			*savedata;
-	u32			page_count;	/* total remappable size */
-	dma_addr_t		iovmm_base;	/* offset to vmm_area */
-	spinlock_t		pte_lock;	/* for pagetable */
-	struct list_head	client;
-	spinlock_t		client_lock;	/* for client list */
-	struct device		*dev;
-
-	struct iommu_device	iommu;		/* IOMMU Core handle */
-};
-
-struct gart_domain {
-	struct iommu_domain domain;		/* generic domain handle */
-	struct gart_device *gart;		/* link to gart device   */
-};
-
-static struct gart_device *gart_handle; /* unique for a system */
-
-static bool gart_debug;
-
-#define GART_PTE(_pfn)						\
-	(GART_ENTRY_PHYS_ADDR_VALID | ((_pfn) << PAGE_SHIFT))
-
-static struct gart_domain *to_gart_domain(struct iommu_domain *dom)
-{
-	return container_of(dom, struct gart_domain, domain);
-}
-
-/*
- * 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)	((void)readl((gart)->regs + GART_CONFIG))
-
-#define for_each_gart_pte(gart, iova)					\
-	for (iova = gart->iovmm_base;					\
-	     iova < gart->iovmm_base + GART_PAGE_SIZE * gart->page_count; \
-	     iova += GART_PAGE_SIZE)
-
-static inline void gart_set_pte(struct gart_device *gart,
-				unsigned long offs, u32 pte)
-{
-	writel(offs, gart->regs + GART_ENTRY_ADDR);
-	writel(pte, gart->regs + GART_ENTRY_DATA);
-
-	dev_dbg(gart->dev, "%s %08lx:%08x\n",
-		 pte ? "map" : "unmap", offs, pte & GART_PAGE_MASK);
-}
-
-static inline unsigned long gart_read_pte(struct gart_device *gart,
-					  unsigned long offs)
-{
-	unsigned long pte;
-
-	writel(offs, gart->regs + GART_ENTRY_ADDR);
-	pte = readl(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(1, gart->regs + GART_CONFIG);
-	FLUSH_GART_REGS(gart);
-}
-
-#ifdef DEBUG
-static void gart_dump_table(struct gart_device *gart)
-{
-	unsigned long iova;
-	unsigned long flags;
-
-	spin_lock_irqsave(&gart->pte_lock, flags);
-	for_each_gart_pte(gart, iova) {
-		unsigned long pte;
-
-		pte = gart_read_pte(gart, iova);
-
-		dev_dbg(gart->dev, "%s %08lx:%08lx\n",
-			(GART_ENTRY_PHYS_ADDR_VALID & pte) ? "v" : " ",
-			iova, pte & GART_PAGE_MASK);
-	}
-	spin_unlock_irqrestore(&gart->pte_lock, flags);
-}
-#else
-static inline void gart_dump_table(struct gart_device *gart)
-{
-}
-#endif
-
-static inline bool gart_iova_range_valid(struct gart_device *gart,
-					 unsigned long iova, size_t bytes)
-{
-	unsigned long iova_start, iova_end, gart_start, gart_end;
-
-	iova_start = iova;
-	iova_end = iova_start + bytes - 1;
-	gart_start = gart->iovmm_base;
-	gart_end = gart_start + gart->page_count * GART_PAGE_SIZE - 1;
-
-	if (iova_start < gart_start)
-		return false;
-	if (iova_end > gart_end)
-		return false;
-	return true;
-}
-
-static int gart_iommu_attach_dev(struct iommu_domain *domain,
-				 struct device *dev)
-{
-	struct gart_domain *gart_domain = to_gart_domain(domain);
-	struct gart_device *gart = gart_domain->gart;
-	struct gart_client *client, *c;
-	int err = 0;
-
-	client = devm_kzalloc(gart->dev, sizeof(*c), GFP_KERNEL);
-	if (!client)
-		return -ENOMEM;
-	client->dev = dev;
-
-	spin_lock(&gart->client_lock);
-	list_for_each_entry(c, &gart->client, list) {
-		if (c->dev == dev) {
-			dev_err(gart->dev,
-				"%s is already attached\n", dev_name(dev));
-			err = -EINVAL;
-			goto fail;
-		}
-	}
-	list_add(&client->list, &gart->client);
-	spin_unlock(&gart->client_lock);
-	dev_dbg(gart->dev, "Attached %s\n", dev_name(dev));
-	return 0;
-
-fail:
-	devm_kfree(gart->dev, client);
-	spin_unlock(&gart->client_lock);
-	return err;
-}
-
-static void gart_iommu_detach_dev(struct iommu_domain *domain,
-				  struct device *dev)
-{
-	struct gart_domain *gart_domain = to_gart_domain(domain);
-	struct gart_device *gart = gart_domain->gart;
-	struct gart_client *c;
-
-	spin_lock(&gart->client_lock);
-
-	list_for_each_entry(c, &gart->client, list) {
-		if (c->dev == dev) {
-			list_del(&c->list);
-			devm_kfree(gart->dev, c);
-			dev_dbg(gart->dev, "Detached %s\n", dev_name(dev));
-			goto out;
-		}
-	}
-	dev_err(gart->dev, "Couldn't find\n");
-out:
-	spin_unlock(&gart->client_lock);
-}
-
-static struct iommu_domain *gart_iommu_domain_alloc(unsigned type)
-{
-	struct gart_domain *gart_domain;
-	struct gart_device *gart;
-
-	if (type != IOMMU_DOMAIN_UNMANAGED)
-		return NULL;
-
-	gart = gart_handle;
-	if (!gart)
-		return NULL;
-
-	gart_domain = kzalloc(sizeof(*gart_domain), GFP_KERNEL);
-	if (!gart_domain)
-		return NULL;
-
-	gart_domain->gart = gart;
-	gart_domain->domain.geometry.aperture_start = gart->iovmm_base;
-	gart_domain->domain.geometry.aperture_end = gart->iovmm_base +
-					gart->page_count * GART_PAGE_SIZE - 1;
-	gart_domain->domain.geometry.force_aperture = true;
-
-	return &gart_domain->domain;
-}
-
-static void gart_iommu_domain_free(struct iommu_domain *domain)
-{
-	struct gart_domain *gart_domain = to_gart_domain(domain);
-	struct gart_device *gart = gart_domain->gart;
-
-	if (gart) {
-		spin_lock(&gart->client_lock);
-		if (!list_empty(&gart->client)) {
-			struct gart_client *c;
-
-			list_for_each_entry(c, &gart->client, list)
-				gart_iommu_detach_dev(domain, c->dev);
-		}
-		spin_unlock(&gart->client_lock);
-	}
-
-	kfree(gart_domain);
-}
-
-static int gart_iommu_map(struct iommu_domain *domain, unsigned long iova,
-			  phys_addr_t pa, size_t bytes, int prot)
-{
-	struct gart_domain *gart_domain = to_gart_domain(domain);
-	struct gart_device *gart = gart_domain->gart;
-	unsigned long flags;
-	unsigned long pfn;
-	unsigned long pte;
-
-	if (!gart_iova_range_valid(gart, iova, bytes))
-		return -EINVAL;
-
-	spin_lock_irqsave(&gart->pte_lock, flags);
-	pfn = __phys_to_pfn(pa);
-	if (!pfn_valid(pfn)) {
-		dev_err(gart->dev, "Invalid page: %pa\n", &pa);
-		spin_unlock_irqrestore(&gart->pte_lock, flags);
-		return -EINVAL;
-	}
-	if (gart_debug) {
-		pte = gart_read_pte(gart, iova);
-		if (pte & GART_ENTRY_PHYS_ADDR_VALID) {
-			spin_unlock_irqrestore(&gart->pte_lock, flags);
-			dev_err(gart->dev, "Page entry is in-use\n");
-			return -EBUSY;
-		}
-	}
-	gart_set_pte(gart, iova, GART_PTE(pfn));
-	FLUSH_GART_REGS(gart);
-	spin_unlock_irqrestore(&gart->pte_lock, flags);
-	return 0;
-}
-
-static size_t gart_iommu_unmap(struct iommu_domain *domain, unsigned long iova,
-			       size_t bytes)
-{
-	struct gart_domain *gart_domain = to_gart_domain(domain);
-	struct gart_device *gart = gart_domain->gart;
-	unsigned long flags;
-
-	if (!gart_iova_range_valid(gart, iova, bytes))
-		return 0;
-
-	spin_lock_irqsave(&gart->pte_lock, flags);
-	gart_set_pte(gart, iova, 0);
-	FLUSH_GART_REGS(gart);
-	spin_unlock_irqrestore(&gart->pte_lock, flags);
-	return bytes;
-}
-
-static phys_addr_t gart_iommu_iova_to_phys(struct iommu_domain *domain,
-					   dma_addr_t iova)
-{
-	struct gart_domain *gart_domain = to_gart_domain(domain);
-	struct gart_device *gart = gart_domain->gart;
-	unsigned long pte;
-	phys_addr_t pa;
-	unsigned long flags;
-
-	if (!gart_iova_range_valid(gart, iova, 0))
-		return -EINVAL;
-
-	spin_lock_irqsave(&gart->pte_lock, flags);
-	pte = gart_read_pte(gart, iova);
-	spin_unlock_irqrestore(&gart->pte_lock, flags);
-
-	pa = (pte & GART_PAGE_MASK);
-	if (!pfn_valid(__phys_to_pfn(pa))) {
-		dev_err(gart->dev, "No entry for %08llx:%pa\n",
-			 (unsigned long long)iova, &pa);
-		gart_dump_table(gart);
-		return -EINVAL;
-	}
-	return pa;
-}
-
-static bool gart_iommu_capable(enum iommu_cap cap)
-{
-	return false;
-}
-
-static int gart_iommu_add_device(struct device *dev)
-{
-	struct iommu_group *group = iommu_group_get_for_dev(dev);
-
-	if (IS_ERR(group))
-		return PTR_ERR(group);
-
-	iommu_group_put(group);
-
-	iommu_device_link(&gart_handle->iommu, dev);
-
-	return 0;
-}
-
-static void gart_iommu_remove_device(struct device *dev)
-{
-	iommu_group_remove_device(dev);
-	iommu_device_unlink(&gart_handle->iommu, dev);
-}
-
-static const struct iommu_ops gart_iommu_ops = {
-	.capable	= gart_iommu_capable,
-	.domain_alloc	= gart_iommu_domain_alloc,
-	.domain_free	= gart_iommu_domain_free,
-	.attach_dev	= gart_iommu_attach_dev,
-	.detach_dev	= gart_iommu_detach_dev,
-	.add_device	= gart_iommu_add_device,
-	.remove_device	= gart_iommu_remove_device,
-	.device_group	= generic_device_group,
-	.map		= gart_iommu_map,
-	.unmap		= gart_iommu_unmap,
-	.iova_to_phys	= gart_iommu_iova_to_phys,
-	.pgsize_bitmap	= GART_IOMMU_PGSIZES,
-};
-
-static int tegra_gart_suspend(struct device *dev)
-{
-	struct gart_device *gart = dev_get_drvdata(dev);
-	unsigned long iova;
-	u32 *data = gart->savedata;
-	unsigned long flags;
-
-	spin_lock_irqsave(&gart->pte_lock, flags);
-	for_each_gart_pte(gart, iova)
-		*(data++) = gart_read_pte(gart, iova);
-	spin_unlock_irqrestore(&gart->pte_lock, flags);
-	return 0;
-}
-
-static int tegra_gart_resume(struct device *dev)
-{
-	struct gart_device *gart = dev_get_drvdata(dev);
-	unsigned long flags;
-
-	spin_lock_irqsave(&gart->pte_lock, flags);
-	do_gart_setup(gart, gart->savedata);
-	spin_unlock_irqrestore(&gart->pte_lock, flags);
-	return 0;
-}
-
-static int tegra_gart_probe(struct platform_device *pdev)
-{
-	struct gart_device *gart;
-	struct resource *res, *res_remap;
-	void __iomem *gart_regs;
-	struct device *dev = &pdev->dev;
-	int ret;
-
-	if (gart_handle)
-		return -EIO;
-
-	BUILD_BUG_ON(PAGE_SHIFT != GART_PAGE_SHIFT);
-
-	/* the GART memory aperture is required */
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	res_remap = platform_get_resource(pdev, IORESOURCE_MEM, 1);
-	if (!res || !res_remap) {
-		dev_err(dev, "GART memory aperture expected\n");
-		return -ENXIO;
-	}
-
-	gart = devm_kzalloc(dev, sizeof(*gart), GFP_KERNEL);
-	if (!gart) {
-		dev_err(dev, "failed to allocate gart_device\n");
-		return -ENOMEM;
-	}
-
-	gart_regs = devm_ioremap(dev, res->start, resource_size(res));
-	if (!gart_regs) {
-		dev_err(dev, "failed to remap GART registers\n");
-		return -ENXIO;
-	}
-
-	ret = iommu_device_sysfs_add(&gart->iommu, &pdev->dev, NULL,
-				     dev_name(&pdev->dev));
-	if (ret) {
-		dev_err(dev, "Failed to register IOMMU in sysfs\n");
-		return ret;
-	}
-
-	iommu_device_set_ops(&gart->iommu, &gart_iommu_ops);
-
-	ret = iommu_device_register(&gart->iommu);
-	if (ret) {
-		dev_err(dev, "Failed to register IOMMU\n");
-		iommu_device_sysfs_remove(&gart->iommu);
-		return ret;
-	}
-
-	gart->dev = &pdev->dev;
-	spin_lock_init(&gart->pte_lock);
-	spin_lock_init(&gart->client_lock);
-	INIT_LIST_HEAD(&gart->client);
-	gart->regs = gart_regs;
-	gart->iovmm_base = (dma_addr_t)res_remap->start;
-	gart->page_count = (resource_size(res_remap) >> GART_PAGE_SHIFT);
-
-	gart->savedata = vmalloc(array_size(sizeof(u32), gart->page_count));
-	if (!gart->savedata) {
-		dev_err(dev, "failed to allocate context save area\n");
-		return -ENOMEM;
-	}
-
-	platform_set_drvdata(pdev, gart);
-	do_gart_setup(gart, NULL);
-
-	gart_handle = gart;
-
-	return 0;
-}
-
-static const struct dev_pm_ops tegra_gart_pm_ops = {
-	.suspend	= tegra_gart_suspend,
-	.resume		= tegra_gart_resume,
-};
-
-static const struct of_device_id tegra_gart_of_match[] = {
-	{ .compatible = "nvidia,tegra20-gart", },
-	{ },
-};
-
-static struct platform_driver tegra_gart_driver = {
-	.probe		= tegra_gart_probe,
-	.driver = {
-		.name	= "tegra-gart",
-		.pm	= &tegra_gart_pm_ops,
-		.of_match_table = tegra_gart_of_match,
-		.suppress_bind_attrs = true,
-	},
-};
-
-static int __init tegra_gart_init(void)
-{
-	return platform_driver_register(&tegra_gart_driver);
-}
-subsys_initcall(tegra_gart_init);
-
-module_param(gart_debug, bool, 0644);
-MODULE_PARM_DESC(gart_debug, "Enable GART debugging");