![Greg Kroah-Hartman](/assets/img/avatar_default.png)
CONFIG_HOTPLUG is going away as an option. As a result, the __dev* markings need to be removed. This change removes the use of __devinit, __devexit_p, __devinitdata, and __devexit from these drivers. Based on patches originally written by Bill Pemberton, but redone by me in order to handle some of the coding style issues better, by hand. Cc: Bill Pemberton <wfp5p@virginia.edu> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Joerg Roedel <joro@8bytes.org> Cc: Ohad Ben-Cohen <ohad@wizery.com> Cc: Tony Lindgren <tony@atomide.com> Cc: Omar Ramirez Luna <omar.luna@linaro.org> Cc: Mauro Carvalho Chehab <mchehab@redhat.com> Cc: Hiroshi Doyu <hdoyu@nvidia.com> Cc: Stephen Warren <swarren@wwwdotorg.org> Cc: Bharat Nihalani <bnihalani@nvidia.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
469 lines
12 KiB
C
469 lines
12 KiB
C
/*
|
|
* IOMMU API for GART in 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.
|
|
*/
|
|
|
|
#define pr_fmt(fmt) "%s(): " fmt, __func__
|
|
|
|
#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 <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;
|
|
};
|
|
|
|
static struct gart_device *gart_handle; /* unique for a system */
|
|
|
|
#define GART_PTE(_pfn) \
|
|
(GART_ENTRY_PHYS_ADDR_VALID | ((_pfn) << PAGE_SHIFT))
|
|
|
|
/*
|
|
* 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_device *gart;
|
|
struct gart_client *client, *c;
|
|
int err = 0;
|
|
|
|
gart = gart_handle;
|
|
if (!gart)
|
|
return -EINVAL;
|
|
domain->priv = gart;
|
|
|
|
domain->geometry.aperture_start = gart->iovmm_base;
|
|
domain->geometry.aperture_end = gart->iovmm_base +
|
|
gart->page_count * GART_PAGE_SIZE - 1;
|
|
domain->geometry.force_aperture = true;
|
|
|
|
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_device *gart = domain->priv;
|
|
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 int gart_iommu_domain_init(struct iommu_domain *domain)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void gart_iommu_domain_destroy(struct iommu_domain *domain)
|
|
{
|
|
struct gart_device *gart = domain->priv;
|
|
|
|
if (!gart)
|
|
return;
|
|
|
|
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);
|
|
domain->priv = NULL;
|
|
}
|
|
|
|
static int gart_iommu_map(struct iommu_domain *domain, unsigned long iova,
|
|
phys_addr_t pa, size_t bytes, int prot)
|
|
{
|
|
struct gart_device *gart = domain->priv;
|
|
unsigned long flags;
|
|
unsigned long pfn;
|
|
|
|
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: %08x\n", pa);
|
|
spin_unlock_irqrestore(&gart->pte_lock, flags);
|
|
return -EINVAL;
|
|
}
|
|
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_device *gart = domain->priv;
|
|
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 0;
|
|
}
|
|
|
|
static phys_addr_t gart_iommu_iova_to_phys(struct iommu_domain *domain,
|
|
unsigned long iova)
|
|
{
|
|
struct gart_device *gart = domain->priv;
|
|
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 %08lx:%08x\n", iova, pa);
|
|
gart_dump_table(gart);
|
|
return -EINVAL;
|
|
}
|
|
return pa;
|
|
}
|
|
|
|
static int gart_iommu_domain_has_cap(struct iommu_domain *domain,
|
|
unsigned long cap)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static struct iommu_ops gart_iommu_ops = {
|
|
.domain_init = gart_iommu_domain_init,
|
|
.domain_destroy = gart_iommu_domain_destroy,
|
|
.attach_dev = gart_iommu_attach_dev,
|
|
.detach_dev = gart_iommu_detach_dev,
|
|
.map = gart_iommu_map,
|
|
.unmap = gart_iommu_unmap,
|
|
.iova_to_phys = gart_iommu_iova_to_phys,
|
|
.domain_has_cap = gart_iommu_domain_has_cap,
|
|
.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;
|
|
int err;
|
|
struct device *dev = &pdev->dev;
|
|
|
|
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");
|
|
err = -ENXIO;
|
|
goto fail;
|
|
}
|
|
|
|
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(sizeof(u32) * gart->page_count);
|
|
if (!gart->savedata) {
|
|
dev_err(dev, "failed to allocate context save area\n");
|
|
err = -ENOMEM;
|
|
goto fail;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, gart);
|
|
do_gart_setup(gart, NULL);
|
|
|
|
gart_handle = gart;
|
|
bus_set_iommu(&platform_bus_type, &gart_iommu_ops);
|
|
return 0;
|
|
|
|
fail:
|
|
if (gart_regs)
|
|
devm_iounmap(dev, gart_regs);
|
|
if (gart && gart->savedata)
|
|
vfree(gart->savedata);
|
|
devm_kfree(dev, gart);
|
|
return err;
|
|
}
|
|
|
|
static int tegra_gart_remove(struct platform_device *pdev)
|
|
{
|
|
struct gart_device *gart = platform_get_drvdata(pdev);
|
|
struct device *dev = gart->dev;
|
|
|
|
writel(0, gart->regs + GART_CONFIG);
|
|
if (gart->savedata)
|
|
vfree(gart->savedata);
|
|
if (gart->regs)
|
|
devm_iounmap(dev, gart->regs);
|
|
devm_kfree(dev, gart);
|
|
gart_handle = NULL;
|
|
return 0;
|
|
}
|
|
|
|
const struct dev_pm_ops tegra_gart_pm_ops = {
|
|
.suspend = tegra_gart_suspend,
|
|
.resume = tegra_gart_resume,
|
|
};
|
|
|
|
#ifdef CONFIG_OF
|
|
static struct of_device_id tegra_gart_of_match[] = {
|
|
{ .compatible = "nvidia,tegra20-gart", },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, tegra_gart_of_match);
|
|
#endif
|
|
|
|
static struct platform_driver tegra_gart_driver = {
|
|
.probe = tegra_gart_probe,
|
|
.remove = tegra_gart_remove,
|
|
.driver = {
|
|
.owner = THIS_MODULE,
|
|
.name = "tegra-gart",
|
|
.pm = &tegra_gart_pm_ops,
|
|
.of_match_table = of_match_ptr(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_DESCRIPTION("IOMMU API for GART in Tegra20");
|
|
MODULE_AUTHOR("Hiroshi DOYU <hdoyu@nvidia.com>");
|
|
MODULE_ALIAS("platform:tegra-gart");
|
|
MODULE_LICENSE("GPL v2");
|