Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/iommu/tegra-gart.c b/drivers/iommu/tegra-gart.c
index 7b1361d..3924f7c 100644
--- a/drivers/iommu/tegra-gart.c
+++ b/drivers/iommu/tegra-gart.c
@@ -1,116 +1,81 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
- * IOMMU API for GART in Tegra20
+ * IOMMU API for Graphics Address Relocation Table on Tegra20
*
* Copyright (c) 2010-2012, NVIDIA CORPORATION. All rights reserved.
*
- * 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.
+ * Author: Hiroshi DOYU <hdoyu@nvidia.com>
*/
-#define pr_fmt(fmt) "%s(): " fmt, __func__
+#define dev_fmt(fmt) "gart: " fmt
-#include <linux/module.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 <linux/moduleparam.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/vmalloc.h>
-#include <asm/cacheflush.h>
-
-/* bitmap of the page sizes currently supported */
-#define GART_IOMMU_PGSIZES (SZ_4K)
+#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 (1 << 31)
+
+#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 \
- (~(GART_PAGE_SIZE - 1) & ~GART_ENTRY_PHYS_ADDR_VALID)
+#define GART_PAGE_MASK GENMASK(30, GART_PAGE_SHIFT)
-struct gart_client {
- struct device *dev;
- struct list_head list;
-};
+/* bitmap of the page sizes currently supported */
+#define GART_IOMMU_PGSIZES (GART_PAGE_SIZE)
struct gart_device {
void __iomem *regs;
u32 *savedata;
- u32 page_count; /* total remappable size */
- dma_addr_t iovmm_base; /* offset to vmm_area */
+ unsigned long iovmm_base; /* offset to vmm_area start */
+ unsigned long iovmm_end; /* offset to vmm_area end */
spinlock_t pte_lock; /* for pagetable */
- struct list_head client;
- spinlock_t client_lock; /* for client list */
- struct device *dev;
-
+ 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 gart_domain {
- struct iommu_domain domain; /* generic domain handle */
- struct gart_device *gart; /* link to gart device */
+ struct device *dev;
};
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 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_base + GART_PAGE_SIZE * gart->page_count; \
+ iova < gart->iovmm_end; \
iova += GART_PAGE_SIZE)
static inline void gart_set_pte(struct gart_device *gart,
- unsigned long offs, u32 pte)
+ unsigned long iova, unsigned long 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);
+ 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 offs)
+ unsigned long iova)
{
unsigned long pte;
- writel(offs, gart->regs + GART_ENTRY_ADDR);
- pte = readl(gart->regs + GART_ENTRY_DATA);
+ writel_relaxed(iova, gart->regs + GART_ENTRY_ADDR);
+ pte = readl_relaxed(gart->regs + GART_ENTRY_DATA);
return pte;
}
@@ -122,224 +87,155 @@
for_each_gart_pte(gart, iova)
gart_set_pte(gart, iova, data ? *(data++) : 0);
- writel(1, gart->regs + GART_CONFIG);
+ writel_relaxed(1, gart->regs + GART_CONFIG);
FLUSH_GART_REGS(gart);
}
-#ifdef DEBUG
-static void gart_dump_table(struct gart_device *gart)
+static inline bool gart_iova_range_invalid(struct gart_device *gart,
+ unsigned long iova, size_t bytes)
{
- 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);
+ return unlikely(iova < gart->iovmm_base || bytes != GART_PAGE_SIZE ||
+ iova + bytes > gart->iovmm_end);
}
-#else
-static inline void gart_dump_table(struct gart_device *gart)
+
+static inline bool gart_pte_valid(struct gart_device *gart, unsigned long iova)
{
-}
-#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;
+ 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_domain *gart_domain = to_gart_domain(domain);
- struct gart_device *gart = gart_domain->gart;
- struct gart_client *client, *c;
- int err = 0;
+ struct gart_device *gart = gart_handle;
+ int ret = 0;
- client = devm_kzalloc(gart->dev, sizeof(*c), GFP_KERNEL);
- if (!client)
- return -ENOMEM;
- client->dev = dev;
+ spin_lock(&gart->dom_lock);
- 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;
- }
+ if (gart->active_domain && gart->active_domain != domain) {
+ ret = -EBUSY;
+ } else if (dev->archdata.iommu != domain) {
+ dev->archdata.iommu = domain;
+ gart->active_domain = domain;
+ gart->active_devices++;
}
- 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;
+ spin_unlock(&gart->dom_lock);
+
+ return ret;
}
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;
+ struct gart_device *gart = gart_handle;
- spin_lock(&gart->client_lock);
+ spin_lock(&gart->dom_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;
- }
+ if (dev->archdata.iommu == domain) {
+ dev->archdata.iommu = NULL;
+
+ if (--gart->active_devices == 0)
+ gart->active_domain = NULL;
}
- dev_err(gart->dev, "Couldn't find\n");
-out:
- spin_unlock(&gart->client_lock);
+
+ spin_unlock(&gart->dom_lock);
}
static struct iommu_domain *gart_iommu_domain_alloc(unsigned type)
{
- struct gart_domain *gart_domain;
- struct gart_device *gart;
+ struct iommu_domain *domain;
if (type != IOMMU_DOMAIN_UNMANAGED)
return NULL;
- gart = gart_handle;
- if (!gart)
- 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;
+ }
- 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;
+ return 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;
+ WARN_ON(gart_handle->active_domain == domain);
+ kfree(domain);
+}
- 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);
+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;
}
- kfree(gart_domain);
+ 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)
{
- 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;
+ struct gart_device *gart = gart_handle;
+ int ret;
- if (!gart_iova_range_valid(gart, iova, bytes))
+ if (gart_iova_range_invalid(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);
+ 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;
}
- 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);
+
+ gart_set_pte(gart, iova, 0);
+
return 0;
}
static size_t gart_iommu_unmap(struct iommu_domain *domain, unsigned long iova,
- size_t bytes)
+ size_t bytes, struct iommu_iotlb_gather *gather)
{
- struct gart_domain *gart_domain = to_gart_domain(domain);
- struct gart_device *gart = gart_domain->gart;
- unsigned long flags;
+ struct gart_device *gart = gart_handle;
+ int err;
- if (!gart_iova_range_valid(gart, iova, bytes))
+ if (gart_iova_range_invalid(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;
+ 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_domain *gart_domain = to_gart_domain(domain);
- struct gart_device *gart = gart_domain->gart;
+ struct gart_device *gart = gart_handle;
unsigned long pte;
- phys_addr_t pa;
- unsigned long flags;
- if (!gart_iova_range_valid(gart, iova, 0))
+ if (gart_iova_range_invalid(gart, iova, GART_PAGE_SIZE))
return -EINVAL;
- spin_lock_irqsave(&gart->pte_lock, flags);
+ spin_lock(&gart->pte_lock);
pte = gart_read_pte(gart, iova);
- spin_unlock_irqrestore(&gart->pte_lock, flags);
+ spin_unlock(&gart->pte_lock);
- 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;
+ return pte & GART_PAGE_MASK;
}
static bool gart_iommu_capable(enum iommu_cap cap)
@@ -349,8 +245,12 @@
static int gart_iommu_add_device(struct device *dev)
{
- struct iommu_group *group = iommu_group_get_for_dev(dev);
+ struct iommu_group *group;
+ if (!dev->iommu_fwspec)
+ return -ENODEV;
+
+ group = iommu_group_get_for_dev(dev);
if (IS_ERR(group))
return PTR_ERR(group);
@@ -367,6 +267,23 @@
iommu_device_unlink(&gart_handle->iommu, dev);
}
+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)
+{
+ FLUSH_GART_REGS(gart_handle);
+}
+
+static void gart_iommu_sync(struct iommu_domain *domain,
+ struct iommu_iotlb_gather *gather)
+{
+ gart_iommu_sync_map(domain);
+}
+
static const struct iommu_ops gart_iommu_ops = {
.capable = gart_iommu_capable,
.domain_alloc = gart_iommu_domain_alloc,
@@ -380,155 +297,96 @@
.unmap = gart_iommu_unmap,
.iova_to_phys = gart_iommu_iova_to_phys,
.pgsize_bitmap = GART_IOMMU_PGSIZES,
+ .of_xlate = gart_iommu_of_xlate,
+ .iotlb_sync_map = gart_iommu_sync_map,
+ .iotlb_sync = gart_iommu_sync,
};
-static int tegra_gart_suspend(struct device *dev)
+int tegra_gart_suspend(struct gart_device *gart)
{
- struct gart_device *gart = dev_get_drvdata(dev);
- unsigned long iova;
u32 *data = gart->savedata;
- unsigned long flags;
+ unsigned long iova;
- spin_lock_irqsave(&gart->pte_lock, flags);
+ /*
+ * 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);
- spin_unlock_irqrestore(&gart->pte_lock, flags);
+
return 0;
}
-static int tegra_gart_resume(struct device *dev)
+int tegra_gart_resume(struct gart_device *gart)
{
- 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 *tegra_gart_probe(struct device *dev, struct tegra_mc *mc)
{
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;
+ struct resource *res;
+ int err;
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;
+ 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 = 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 = kzalloc(sizeof(*gart), GFP_KERNEL);
+ if (!gart)
+ return ERR_PTR(-ENOMEM);
gart_handle = gart;
- return 0;
-}
+ 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);
-static int tegra_gart_remove(struct platform_device *pdev)
-{
- struct gart_device *gart = platform_get_drvdata(pdev);
+ do_gart_setup(gart, NULL);
+ err = iommu_device_sysfs_add(&gart->iommu, dev, NULL, "gart");
+ if (err)
+ goto free_gart;
+
+ iommu_device_set_ops(&gart->iommu, &gart_iommu_ops);
+ iommu_device_set_fwnode(&gart->iommu, dev->fwnode);
+
+ err = iommu_device_register(&gart->iommu);
+ 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);
- writel(0, gart->regs + GART_CONFIG);
- if (gart->savedata)
- vfree(gart->savedata);
- gart_handle = NULL;
- return 0;
+ return ERR_PTR(err);
}
-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", },
- { },
-};
-MODULE_DEVICE_TABLE(of, tegra_gart_of_match);
-
-static struct platform_driver tegra_gart_driver = {
- .probe = tegra_gart_probe,
- .remove = tegra_gart_remove,
- .driver = {
- .name = "tegra-gart",
- .pm = &tegra_gart_pm_ops,
- .of_match_table = tegra_gart_of_match,
- },
-};
-
-static int tegra_gart_init(void)
-{
- return platform_driver_register(&tegra_gart_driver);
-}
-
-static void __exit tegra_gart_exit(void)
-{
- platform_driver_unregister(&tegra_gart_driver);
-}
-
-subsys_initcall(tegra_gart_init);
-module_exit(tegra_gart_exit);
module_param(gart_debug, bool, 0644);
-
MODULE_PARM_DESC(gart_debug, "Enable GART debugging");
-MODULE_DESCRIPTION("IOMMU API for GART in Tegra20");
-MODULE_AUTHOR("Hiroshi DOYU <hdoyu@nvidia.com>");
-MODULE_ALIAS("platform:tegra-gart");
-MODULE_LICENSE("GPL v2");