diff options
Diffstat (limited to 'drivers/iommu')
| -rw-r--r-- | drivers/iommu/Kconfig | 20 | ||||
| -rw-r--r-- | drivers/iommu/Makefile | 2 | ||||
| -rw-r--r-- | drivers/iommu/amd_iommu_init.c | 2 | ||||
| -rw-r--r-- | drivers/iommu/omap-iommu-debug.c | 59 | ||||
| -rw-r--r-- | drivers/iommu/omap-iommu.c | 3 | ||||
| -rw-r--r-- | drivers/iommu/tegra-gart.c | 451 | ||||
| -rw-r--r-- | drivers/iommu/tegra-smmu.c | 1034 |
7 files changed, 1555 insertions, 16 deletions
diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig index 6bea6962f8e..3bd9fff5c58 100644 --- a/drivers/iommu/Kconfig +++ b/drivers/iommu/Kconfig @@ -142,4 +142,24 @@ config OMAP_IOMMU_DEBUG Say N unless you know you need this. +config TEGRA_IOMMU_GART + bool "Tegra GART IOMMU Support" + depends on ARCH_TEGRA_2x_SOC + select IOMMU_API + help + Enables support for remapping discontiguous physical memory + shared with the operating system into contiguous I/O virtual + space through the GART (Graphics Address Relocation Table) + hardware included on Tegra SoCs. + +config TEGRA_IOMMU_SMMU + bool "Tegra SMMU IOMMU Support" + depends on ARCH_TEGRA_3x_SOC + select IOMMU_API + help + Enables support for remapping discontiguous physical memory + shared with the operating system into contiguous I/O virtual + space through the SMMU (System Memory Management Unit) + hardware included on Tegra SoCs. + endif # IOMMU_SUPPORT diff --git a/drivers/iommu/Makefile b/drivers/iommu/Makefile index 0e36b4934af..7ad7a3bc124 100644 --- a/drivers/iommu/Makefile +++ b/drivers/iommu/Makefile @@ -8,3 +8,5 @@ obj-$(CONFIG_IRQ_REMAP) += intr_remapping.o obj-$(CONFIG_OMAP_IOMMU) += omap-iommu.o obj-$(CONFIG_OMAP_IOVMM) += omap-iovmm.o obj-$(CONFIG_OMAP_IOMMU_DEBUG) += omap-iommu-debug.o +obj-$(CONFIG_TEGRA_IOMMU_GART) += tegra-gart.o +obj-$(CONFIG_TEGRA_IOMMU_SMMU) += tegra-smmu.o diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c index a051f9a88bd..c56790375e0 100644 --- a/drivers/iommu/amd_iommu_init.c +++ b/drivers/iommu/amd_iommu_init.c @@ -277,7 +277,7 @@ static void iommu_set_exclusion_range(struct amd_iommu *iommu) } /* Programs the physical address of the device table into the IOMMU hardware */ -static void __init iommu_set_device_table(struct amd_iommu *iommu) +static void iommu_set_device_table(struct amd_iommu *iommu) { u64 entry; diff --git a/drivers/iommu/omap-iommu-debug.c b/drivers/iommu/omap-iommu-debug.c index 288da5c1499..103dbd92e25 100644 --- a/drivers/iommu/omap-iommu-debug.c +++ b/drivers/iommu/omap-iommu-debug.c @@ -44,7 +44,8 @@ static ssize_t debug_read_ver(struct file *file, char __user *userbuf, static ssize_t debug_read_regs(struct file *file, char __user *userbuf, size_t count, loff_t *ppos) { - struct omap_iommu *obj = file->private_data; + struct device *dev = file->private_data; + struct omap_iommu *obj = dev_to_omap_iommu(dev); char *p, *buf; ssize_t bytes; @@ -67,7 +68,8 @@ static ssize_t debug_read_regs(struct file *file, char __user *userbuf, static ssize_t debug_read_tlb(struct file *file, char __user *userbuf, size_t count, loff_t *ppos) { - struct omap_iommu *obj = file->private_data; + struct device *dev = file->private_data; + struct omap_iommu *obj = dev_to_omap_iommu(dev); char *p, *buf; ssize_t bytes, rest; @@ -97,7 +99,8 @@ static ssize_t debug_write_pagetable(struct file *file, struct iotlb_entry e; struct cr_regs cr; int err; - struct omap_iommu *obj = file->private_data; + struct device *dev = file->private_data; + struct omap_iommu *obj = dev_to_omap_iommu(dev); char buf[MAXCOLUMN], *p = buf; count = min(count, sizeof(buf)); @@ -184,7 +187,8 @@ out: static ssize_t debug_read_pagetable(struct file *file, char __user *userbuf, size_t count, loff_t *ppos) { - struct omap_iommu *obj = file->private_data; + struct device *dev = file->private_data; + struct omap_iommu *obj = dev_to_omap_iommu(dev); char *p, *buf; size_t bytes; @@ -212,7 +216,8 @@ static ssize_t debug_read_pagetable(struct file *file, char __user *userbuf, static ssize_t debug_read_mmap(struct file *file, char __user *userbuf, size_t count, loff_t *ppos) { - struct omap_iommu *obj = file->private_data; + struct device *dev = file->private_data; + struct omap_iommu *obj = dev_to_omap_iommu(dev); char *p, *buf; struct iovm_struct *tmp; int uninitialized_var(i); @@ -254,7 +259,7 @@ static ssize_t debug_read_mmap(struct file *file, char __user *userbuf, static ssize_t debug_read_mem(struct file *file, char __user *userbuf, size_t count, loff_t *ppos) { - struct omap_iommu *obj = file->private_data; + struct device *dev = file->private_data; char *p, *buf; struct iovm_struct *area; ssize_t bytes; @@ -268,8 +273,8 @@ static ssize_t debug_read_mem(struct file *file, char __user *userbuf, mutex_lock(&iommu_debug_lock); - area = omap_find_iovm_area(obj, (u32)ppos); - if (IS_ERR(area)) { + area = omap_find_iovm_area(dev, (u32)ppos); + if (!area) { bytes = -EINVAL; goto err_out; } @@ -287,7 +292,7 @@ err_out: static ssize_t debug_write_mem(struct file *file, const char __user *userbuf, size_t count, loff_t *ppos) { - struct omap_iommu *obj = file->private_data; + struct device *dev = file->private_data; struct iovm_struct *area; char *p, *buf; @@ -305,8 +310,8 @@ static ssize_t debug_write_mem(struct file *file, const char __user *userbuf, goto err_out; } - area = omap_find_iovm_area(obj, (u32)ppos); - if (IS_ERR(area)) { + area = omap_find_iovm_area(dev, (u32)ppos); + if (!area) { count = -EINVAL; goto err_out; } @@ -350,7 +355,7 @@ DEBUG_FOPS(mem); { \ struct dentry *dent; \ dent = debugfs_create_file(#attr, mode, parent, \ - obj, &debug_##attr##_fops); \ + dev, &debug_##attr##_fops); \ if (!dent) \ return -ENOMEM; \ } @@ -362,20 +367,29 @@ static int iommu_debug_register(struct device *dev, void *data) { struct platform_device *pdev = to_platform_device(dev); struct omap_iommu *obj = platform_get_drvdata(pdev); + struct omap_iommu_arch_data *arch_data; struct dentry *d, *parent; if (!obj || !obj->dev) return -EINVAL; + arch_data = kzalloc(sizeof(*arch_data), GFP_KERNEL); + if (!arch_data) + return -ENOMEM; + + arch_data->iommu_dev = obj; + + dev->archdata.iommu = arch_data; + d = debugfs_create_dir(obj->name, iommu_debug_root); if (!d) - return -ENOMEM; + goto nomem; parent = d; d = debugfs_create_u8("nr_tlb_entries", 400, parent, (u8 *)&obj->nr_tlb_entries); if (!d) - return -ENOMEM; + goto nomem; DEBUG_ADD_FILE_RO(ver); DEBUG_ADD_FILE_RO(regs); @@ -385,6 +399,22 @@ static int iommu_debug_register(struct device *dev, void *data) DEBUG_ADD_FILE(mem); return 0; + +nomem: + kfree(arch_data); + return -ENOMEM; +} + +static int iommu_debug_unregister(struct device *dev, void *data) +{ + if (!dev->archdata.iommu) + return 0; + + kfree(dev->archdata.iommu); + + dev->archdata.iommu = NULL; + + return 0; } static int __init iommu_debug_init(void) @@ -411,6 +441,7 @@ module_init(iommu_debug_init) static void __exit iommu_debugfs_exit(void) { debugfs_remove_recursive(iommu_debug_root); + omap_foreach_iommu_device(NULL, iommu_debug_unregister); } module_exit(iommu_debugfs_exit) diff --git a/drivers/iommu/omap-iommu.c b/drivers/iommu/omap-iommu.c index d8edd979d01..6899dcd02df 100644 --- a/drivers/iommu/omap-iommu.c +++ b/drivers/iommu/omap-iommu.c @@ -1223,7 +1223,8 @@ static int __init omap_iommu_init(void) return platform_driver_register(&omap_iommu_driver); } -module_init(omap_iommu_init); +/* must be ready before omap3isp is probed */ +subsys_initcall(omap_iommu_init); static void __exit omap_iommu_exit(void) { diff --git a/drivers/iommu/tegra-gart.c b/drivers/iommu/tegra-gart.c new file mode 100644 index 00000000000..779306ee7b1 --- /dev/null +++ b/drivers/iommu/tegra-gart.c @@ -0,0 +1,451 @@ +/* + * 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 <asm/cacheflush.h> + +/* bitmap of the page sizes currently supported */ +#define GART_IOMMU_PGSIZES (SZ_4K) + +#define GART_CONFIG 0x24 +#define GART_ENTRY_ADDR 0x28 +#define GART_ENTRY_DATA 0x2c +#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 = dev_get_drvdata(dev->parent); + if (!gart) + return -EINVAL; + domain->priv = gart; + + 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; + 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, +}; + +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, + }, +}; + +static int __devinit tegra_gart_init(void) +{ + bus_set_iommu(&platform_bus_type, &gart_iommu_ops); + 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_LICENSE("GPL v2"); diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c new file mode 100644 index 00000000000..eb93c821f59 --- /dev/null +++ b/drivers/iommu/tegra-smmu.c @@ -0,0 +1,1034 @@ +/* + * IOMMU API for SMMU in Tegra30 + * + * Copyright (c) 2011-2012, 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/pagemap.h> +#include <linux/device.h> +#include <linux/sched.h> +#include <linux/iommu.h> +#include <linux/io.h> + +#include <asm/page.h> +#include <asm/cacheflush.h> + +#include <mach/iomap.h> +#include <mach/smmu.h> + +/* bitmap of the page sizes currently supported */ +#define SMMU_IOMMU_PGSIZES (SZ_4K) + +#define SMMU_CONFIG 0x10 +#define SMMU_CONFIG_DISABLE 0 +#define SMMU_CONFIG_ENABLE 1 + +#define SMMU_TLB_CONFIG 0x14 +#define SMMU_TLB_CONFIG_STATS__MASK (1 << 31) +#define SMMU_TLB_CONFIG_STATS__ENABLE (1 << 31) +#define SMMU_TLB_CONFIG_HIT_UNDER_MISS__ENABLE (1 << 29) +#define SMMU_TLB_CONFIG_ACTIVE_LINES__VALUE 0x10 +#define SMMU_TLB_CONFIG_RESET_VAL 0x20000010 + +#define SMMU_PTC_CONFIG 0x18 +#define SMMU_PTC_CONFIG_STATS__MASK (1 << 31) +#define SMMU_PTC_CONFIG_STATS__ENABLE (1 << 31) +#define SMMU_PTC_CONFIG_CACHE__ENABLE (1 << 29) +#define SMMU_PTC_CONFIG_INDEX_MAP__PATTERN 0x3f +#define SMMU_PTC_CONFIG_RESET_VAL 0x2000003f + +#define SMMU_PTB_ASID 0x1c +#define SMMU_PTB_ASID_CURRENT_SHIFT 0 + +#define SMMU_PTB_DATA 0x20 +#define SMMU_PTB_DATA_RESET_VAL 0 +#define SMMU_PTB_DATA_ASID_NONSECURE_SHIFT 29 +#define SMMU_PTB_DATA_ASID_WRITABLE_SHIFT 30 +#define SMMU_PTB_DATA_ASID_READABLE_SHIFT 31 + +#define SMMU_TLB_FLUSH 0x30 +#define SMMU_TLB_FLUSH_VA_MATCH_ALL 0 +#define SMMU_TLB_FLUSH_VA_MATCH_SECTION 2 +#define SMMU_TLB_FLUSH_VA_MATCH_GROUP 3 +#define SMMU_TLB_FLUSH_ASID_SHIFT 29 +#define SMMU_TLB_FLUSH_ASID_MATCH_DISABLE 0 +#define SMMU_TLB_FLUSH_ASID_MATCH_ENABLE 1 +#define SMMU_TLB_FLUSH_ASID_MATCH_SHIFT 31 + +#define SMMU_PTC_FLUSH 0x34 +#define SMMU_PTC_FLUSH_TYPE_ALL 0 +#define SMMU_PTC_FLUSH_TYPE_ADR 1 +#define SMMU_PTC_FLUSH_ADR_SHIFT 4 + +#define SMMU_ASID_SECURITY 0x38 + +#define SMMU_STATS_TLB_HIT_COUNT 0x1f0 +#define SMMU_STATS_TLB_MISS_COUNT 0x1f4 +#define SMMU_STATS_PTC_HIT_COUNT 0x1f8 +#define SMMU_STATS_PTC_MISS_COUNT 0x1fc + +#define SMMU_TRANSLATION_ENABLE_0 0x228 +#define SMMU_TRANSLATION_ENABLE_1 0x22c +#define SMMU_TRANSLATION_ENABLE_2 0x230 + +#define SMMU_AFI_ASID 0x238 /* PCIE */ +#define SMMU_AVPC_ASID 0x23c /* AVP */ +#define SMMU_DC_ASID 0x240 /* Display controller */ +#define SMMU_DCB_ASID 0x244 /* Display controller B */ +#define SMMU_EPP_ASID 0x248 /* Encoder pre-processor */ +#define SMMU_G2_ASID 0x24c /* 2D engine */ +#define SMMU_HC_ASID 0x250 /* Host1x */ +#define SMMU_HDA_ASID 0x254 /* High-def audio */ +#define SMMU_ISP_ASID 0x258 /* Image signal processor */ +#define SMMU_MPE_ASID 0x264 /* MPEG encoder */ +#define SMMU_NV_ASID 0x268 /* (3D) */ +#define SMMU_NV2_ASID 0x26c /* (3D) */ +#define SMMU_PPCS_ASID 0x270 /* AHB */ +#define SMMU_SATA_ASID 0x278 /* SATA */ +#define SMMU_VDE_ASID 0x27c /* Video decoder */ +#define SMMU_VI_ASID 0x280 /* Video input */ + +#define SMMU_PDE_NEXT_SHIFT 28 + +/* AHB Arbiter Registers */ +#define AHB_XBAR_CTRL 0xe0 +#define AHB_XBAR_CTRL_SMMU_INIT_DONE_DONE 1 +#define AHB_XBAR_CTRL_SMMU_INIT_DONE_SHIFT 17 + +#define SMMU_NUM_ASIDS 4 +#define SMMU_TLB_FLUSH_VA_SECTION__MASK 0xffc00000 +#define SMMU_TLB_FLUSH_VA_SECTION__SHIFT 12 /* right shift */ +#define SMMU_TLB_FLUSH_VA_GROUP__MASK 0xffffc000 +#define SMMU_TLB_FLUSH_VA_GROUP__SHIFT 12 /* right shift */ +#define SMMU_TLB_FLUSH_VA(iova, which) \ + ((((iova) & SMMU_TLB_FLUSH_VA_##which##__MASK) >> \ + SMMU_TLB_FLUSH_VA_##which##__SHIFT) | \ + SMMU_TLB_FLUSH_VA_MATCH_##which) +#define SMMU_PTB_ASID_CUR(n) \ + ((n) << SMMU_PTB_ASID_CURRENT_SHIFT) +#define SMMU_TLB_FLUSH_ASID_MATCH_disable \ + (SMMU_TLB_FLUSH_ASID_MATCH_DISABLE << \ + SMMU_TLB_FLUSH_ASID_MATCH_SHIFT) +#define SMMU_TLB_FLUSH_ASID_MATCH__ENABLE \ + (SMMU_TLB_FLUSH_ASID_MATCH_ENABLE << \ + SMMU_TLB_FLUSH_ASID_MATCH_SHIFT) + +#define SMMU_PAGE_SHIFT 12 +#define SMMU_PAGE_SIZE (1 << SMMU_PAGE_SHIFT) + +#define SMMU_PDIR_COUNT 1024 +#define SMMU_PDIR_SIZE (sizeof(unsigned long) * SMMU_PDIR_COUNT) +#define SMMU_PTBL_COUNT 1024 +#define SMMU_PTBL_SIZE (sizeof(unsigned long) * SMMU_PTBL_COUNT) +#define SMMU_PDIR_SHIFT 12 +#define SMMU_PDE_SHIFT 12 +#define SMMU_PTE_SHIFT 12 +#define SMMU_PFN_MASK 0x000fffff + +#define SMMU_ADDR_TO_PFN(addr) ((addr) >> 12) +#define SMMU_ADDR_TO_PDN(addr) ((addr) >> 22) +#define SMMU_PDN_TO_ADDR(addr) ((pdn) << 22) + +#define _READABLE (1 << SMMU_PTB_DATA_ASID_READABLE_SHIFT) +#define _WRITABLE (1 << SMMU_PTB_DATA_ASID_WRITABLE_SHIFT) +#define _NONSECURE (1 << SMMU_PTB_DATA_ASID_NONSECURE_SHIFT) +#define _PDE_NEXT (1 << SMMU_PDE_NEXT_SHIFT) +#define _MASK_ATTR (_READABLE | _WRITABLE | _NONSECURE) + +#define _PDIR_ATTR (_READABLE | _WRITABLE | _NONSECURE) + +#define _PDE_ATTR (_READABLE | _WRITABLE | _NONSECURE) +#define _PDE_ATTR_N (_PDE_ATTR | _PDE_NEXT) +#define _PDE_VACANT(pdn) (((pdn) << 10) | _PDE_ATTR) + +#define _PTE_ATTR (_READABLE | _WRITABLE | _NONSECURE) +#define _PTE_VACANT(addr) (((addr) >> SMMU_PAGE_SHIFT) | _PTE_ATTR) + +#define SMMU_MK_PDIR(page, attr) \ + ((page_to_phys(page) >> SMMU_PDIR_SHIFT) | (attr)) +#define SMMU_MK_PDE(page, attr) \ + (unsigned long)((page_to_phys(page) >> SMMU_PDE_SHIFT) | (attr)) +#define SMMU_EX_PTBL_PAGE(pde) \ + pfn_to_page((unsigned long)(pde) & SMMU_PFN_MASK) +#define SMMU_PFN_TO_PTE(pfn, attr) (unsigned long)((pfn) | (attr)) + +#define SMMU_ASID_ENABLE(asid) ((asid) | (1 << 31)) +#define SMMU_ASID_DISABLE 0 +#define SMMU_ASID_ASID(n) ((n) & ~SMMU_ASID_ENABLE(0)) + +#define smmu_client_enable_hwgrp(c, m) smmu_client_set_hwgrp(c, m, 1) +#define smmu_client_disable_hwgrp(c) smmu_client_set_hwgrp(c, 0, 0) +#define __smmu_client_enable_hwgrp(c, m) __smmu_client_set_hwgrp(c, m, 1) +#define __smmu_client_disable_hwgrp(c) __smmu_client_set_hwgrp(c, 0, 0) + +#define HWGRP_INIT(client) [HWGRP_##client] = SMMU_##client##_ASID + +static const u32 smmu_hwgrp_asid_reg[] = { + HWGRP_INIT(AFI), + HWGRP_INIT(AVPC), + HWGRP_INIT(DC), + HWGRP_INIT(DCB), + HWGRP_INIT(EPP), + HWGRP_INIT(G2), + HWGRP_INIT(HC), + HWGRP_INIT(HDA), + HWGRP_INIT(ISP), + HWGRP_INIT(MPE), + HWGRP_INIT(NV), + HWGRP_INIT(NV2), + HWGRP_INIT(PPCS), + HWGRP_INIT(SATA), + HWGRP_INIT(VDE), + HWGRP_INIT(VI), +}; +#define HWGRP_ASID_REG(x) (smmu_hwgrp_asid_reg[x]) + +/* + * Per client for address space + */ +struct smmu_client { + struct device *dev; + struct list_head list; + struct smmu_as *as; + u32 hwgrp; +}; + +/* + * Per address space + */ +struct smmu_as { + struct smmu_device *smmu; /* back pointer to container */ + unsigned int asid; + spinlock_t lock; /* for pagetable */ + struct page *pdir_page; + unsigned long pdir_attr; + unsigned long pde_attr; + unsigned long pte_attr; + unsigned int *pte_count; + + struct list_head client; + spinlock_t client_lock; /* for client list */ +}; + +/* + * Per SMMU device - IOMMU device + */ +struct smmu_device { + void __iomem *regs, *regs_ahbarb; + unsigned long iovmm_base; /* remappable base address */ + unsigned long page_count; /* total remappable size */ + spinlock_t lock; + char *name; + struct device *dev; + int num_as; + struct smmu_as *as; /* Run-time allocated array */ + struct page *avp_vector_page; /* dummy page shared by all AS's */ + + /* + * Register image savers for suspend/resume + */ + unsigned long translation_enable_0; + unsigned long translation_enable_1; + unsigned long translation_enable_2; + unsigned long asid_security; +}; + +static struct smmu_device *smmu_handle; /* unique for a system */ + +/* + * SMMU/AHB register accessors + */ +static inline u32 smmu_read(struct smmu_device *smmu, size_t offs) +{ + return readl(smmu->regs + offs); +} +static inline void smmu_write(struct smmu_device *smmu, u32 val, size_t offs) +{ + writel(val, smmu->regs + offs); +} + +static inline u32 ahb_read(struct smmu_device *smmu, size_t offs) +{ + return readl(smmu->regs_ahbarb + offs); +} +static inline void ahb_write(struct smmu_device *smmu, u32 val, size_t offs) +{ + writel(val, smmu->regs_ahbarb + offs); +} + +#define VA_PAGE_TO_PA(va, page) \ + (page_to_phys(page) + ((unsigned long)(va) & ~PAGE_MASK)) + +#define FLUSH_CPU_DCACHE(va, page, size) \ + do { \ + unsigned long _pa_ = VA_PAGE_TO_PA(va, page); \ + __cpuc_flush_dcache_area((void *)(va), (size_t)(size)); \ + outer_flush_range(_pa_, _pa_+(size_t)(size)); \ + } while (0) + +/* + * Any interaction between any block on PPSB and a block on APB or AHB + * must have these read-back barriers to ensure the APB/AHB bus + * transaction is complete before initiating activity on the PPSB + * block. + */ +#define FLUSH_SMMU_REGS(smmu) smmu_read(smmu, SMMU_CONFIG) + +#define smmu_client_hwgrp(c) (u32)((c)->dev->platform_data) + +static int __smmu_client_set_hwgrp(struct smmu_client *c, + unsigned long map, int on) +{ + int i; + struct smmu_as *as = c->as; + u32 val, offs, mask = SMMU_ASID_ENABLE(as->asid); + struct smmu_device *smmu = as->smmu; + + WARN_ON(!on && map); + if (on && !map) + return -EINVAL; + if (!on) + map = smmu_client_hwgrp(c); + + for_each_set_bit(i, &map, HWGRP_COUNT) { + offs = HWGRP_ASID_REG(i); + val = smmu_read(smmu, offs); + if (on) { + if (WARN_ON(val & mask)) + goto err_hw_busy; + val |= mask; + } else { + WARN_ON((val & mask) == mask); + val &= ~mask; + } + smmu_write(smmu, val, offs); + } + FLUSH_SMMU_REGS(smmu); + c->hwgrp = map; + return 0; + +err_hw_busy: + for_each_set_bit(i, &map, HWGRP_COUNT) { + offs = HWGRP_ASID_REG(i); + val = smmu_read(smmu, offs); + val &= ~mask; + smmu_write(smmu, val, offs); + } + return -EBUSY; +} + +static int smmu_client_set_hwgrp(struct smmu_client *c, u32 map, int on) +{ + u32 val; + unsigned long flags; + struct smmu_as *as = c->as; + struct smmu_device *smmu = as->smmu; + + spin_lock_irqsave(&smmu->lock, flags); + val = __smmu_client_set_hwgrp(c, map, on); + spin_unlock_irqrestore(&smmu->lock, flags); + return val; +} + +/* + * Flush all TLB entries and all PTC entries + * Caller must lock smmu + */ +static void smmu_flush_regs(struct smmu_device *smmu, int enable) +{ + u32 val; + + smmu_write(smmu, SMMU_PTC_FLUSH_TYPE_ALL, SMMU_PTC_FLUSH); + FLUSH_SMMU_REGS(smmu); + val = SMMU_TLB_FLUSH_VA_MATCH_ALL | + SMMU_TLB_FLUSH_ASID_MATCH_disable; + smmu_write(smmu, val, SMMU_TLB_FLUSH); + + if (enable) + smmu_write(smmu, SMMU_CONFIG_ENABLE, SMMU_CONFIG); + FLUSH_SMMU_REGS(smmu); +} + +static void smmu_setup_regs(struct smmu_device *smmu) +{ + int i; + u32 val; + + for (i = 0; i < smmu->num_as; i++) { + struct smmu_as *as = &smmu->as[i]; + struct smmu_client *c; + + smmu_write(smmu, SMMU_PTB_ASID_CUR(as->asid), SMMU_PTB_ASID); + val = as->pdir_page ? + SMMU_MK_PDIR(as->pdir_page, as->pdir_attr) : + SMMU_PTB_DATA_RESET_VAL; + smmu_write(smmu, val, SMMU_PTB_DATA); + + list_for_each_entry(c, &as->client, list) + __smmu_client_set_hwgrp(c, c->hwgrp, 1); + } + + smmu_write(smmu, smmu->translation_enable_0, SMMU_TRANSLATION_ENABLE_0); + smmu_write(smmu, smmu->translation_enable_1, SMMU_TRANSLATION_ENABLE_1); + smmu_write(smmu, smmu->translation_enable_2, SMMU_TRANSLATION_ENABLE_2); + smmu_write(smmu, smmu->asid_security, SMMU_ASID_SECURITY); + smmu_write(smmu, SMMU_TLB_CONFIG_RESET_VAL, SMMU_TLB_CONFIG); + smmu_write(smmu, SMMU_PTC_CONFIG_RESET_VAL, SMMU_PTC_CONFIG); + + smmu_flush_regs(smmu, 1); + + val = ahb_read(smmu, AHB_XBAR_CTRL); + val |= AHB_XBAR_CTRL_SMMU_INIT_DONE_DONE << + AHB_XBAR_CTRL_SMMU_INIT_DONE_SHIFT; + ahb_write(smmu, val, AHB_XBAR_CTRL); +} + +static void flush_ptc_and_tlb(struct smmu_device *smmu, + struct smmu_as *as, dma_addr_t iova, + unsigned long *pte, struct page *page, int is_pde) +{ + u32 val; + unsigned long tlb_flush_va = is_pde + ? SMMU_TLB_FLUSH_VA(iova, SECTION) + : SMMU_TLB_FLUSH_VA(iova, GROUP); + + val = SMMU_PTC_FLUSH_TYPE_ADR | VA_PAGE_TO_PA(pte, page); + smmu_write(smmu, val, SMMU_PTC_FLUSH); + FLUSH_SMMU_REGS(smmu); + val = tlb_flush_va | + SMMU_TLB_FLUSH_ASID_MATCH__ENABLE | + (as->asid << SMMU_TLB_FLUSH_ASID_SHIFT); + smmu_write(smmu, val, SMMU_TLB_FLUSH); + FLUSH_SMMU_REGS(smmu); +} + +static void free_ptbl(struct smmu_as *as, dma_addr_t iova) +{ + unsigned long pdn = SMMU_ADDR_TO_PDN(iova); + unsigned long *pdir = (unsigned long *)page_address(as->pdir_page); + + if (pdir[pdn] != _PDE_VACANT(pdn)) { + dev_dbg(as->smmu->dev, "pdn: %lx\n", pdn); + + ClearPageReserved(SMMU_EX_PTBL_PAGE(pdir[pdn])); + __free_page(SMMU_EX_PTBL_PAGE(pdir[pdn])); + pdir[pdn] = _PDE_VACANT(pdn); + FLUSH_CPU_DCACHE(&pdir[pdn], as->pdir_page, sizeof pdir[pdn]); + flush_ptc_and_tlb(as->smmu, as, iova, &pdir[pdn], + as->pdir_page, 1); + } +} + +static void free_pdir(struct smmu_as *as) +{ + unsigned addr; + int count; + struct device *dev = as->smmu->dev; + + if (!as->pdir_page) + return; + + addr = as->smmu->iovmm_base; + count = as->smmu->page_count; + while (count-- > 0) { + free_ptbl(as, addr); + addr += SMMU_PAGE_SIZE * SMMU_PTBL_COUNT; + } + ClearPageReserved(as->pdir_page); + __free_page(as->pdir_page); + as->pdir_page = NULL; + devm_kfree(dev, as->pte_count); + as->pte_count = NULL; +} + +/* + * Maps PTBL for given iova and returns the PTE address + * Caller must unmap the mapped PTBL returned in *ptbl_page_p + */ +static unsigned long *locate_pte(struct smmu_as *as, + dma_addr_t iova, bool allocate, + struct page **ptbl_page_p, + unsigned int **count) +{ + unsigned long ptn = SMMU_ADDR_TO_PFN(iova); + unsigned long pdn = SMMU_ADDR_TO_PDN(iova); + unsigned long *pdir = page_address(as->pdir_page); + unsigned long *ptbl; + + if (pdir[pdn] != _PDE_VACANT(pdn)) { + /* Mapped entry table already exists */ + *ptbl_page_p = SMMU_EX_PTBL_PAGE(pdir[pdn]); + ptbl = page_address(*ptbl_page_p); + } else if (!allocate) { + return NULL; + } else { + int pn; + unsigned long addr = SMMU_PDN_TO_ADDR(pdn); + + /* Vacant - allocate a new page table */ + dev_dbg(as->smmu->dev, "New PTBL pdn: %lx\n", pdn); + + *ptbl_page_p = alloc_page(GFP_ATOMIC); + if (!*ptbl_page_p) { + dev_err(as->smmu->dev, + "failed to allocate smmu_device page table\n"); + return NULL; + } + SetPageReserved(*ptbl_page_p); + ptbl = (unsigned long *)page_address(*ptbl_page_p); + for (pn = 0; pn < SMMU_PTBL_COUNT; + pn++, addr += SMMU_PAGE_SIZE) { + ptbl[pn] = _PTE_VACANT(addr); + } + FLUSH_CPU_DCACHE(ptbl, *ptbl_page_p, SMMU_PTBL_SIZE); + pdir[pdn] = SMMU_MK_PDE(*ptbl_page_p, + as->pde_attr | _PDE_NEXT); + FLUSH_CPU_DCACHE(&pdir[pdn], as->pdir_page, sizeof pdir[pdn]); + flush_ptc_and_tlb(as->smmu, as, iova, &pdir[pdn], + as->pdir_page, 1); + } + *count = &as->pte_count[pdn]; + + return &ptbl[ptn % SMMU_PTBL_COUNT]; +} + +#ifdef CONFIG_SMMU_SIG_DEBUG +static void put_signature(struct smmu_as *as, + dma_addr_t iova, unsigned long pfn) +{ + struct page *page; + unsigned long *vaddr; + + page = pfn_to_page(pfn); + vaddr = page_address(page); + if (!vaddr) + return; + + vaddr[0] = iova; + vaddr[1] = pfn << PAGE_SHIFT; + FLUSH_CPU_DCACHE(vaddr, page, sizeof(vaddr[0]) * 2); +} +#else +static inline void put_signature(struct smmu_as *as, + unsigned long addr, unsigned long pfn) +{ +} +#endif + +/* + * Caller must lock/unlock as + */ +static int alloc_pdir(struct smmu_as *as) +{ + unsigned long *pdir; + int pdn; + u32 val; + struct smmu_device *smmu = as->smmu; + + if (as->pdir_page) + return 0; + + as->pte_count = devm_kzalloc(smmu->dev, + sizeof(as->pte_count[0]) * SMMU_PDIR_COUNT, GFP_KERNEL); + if (!as->pte_count) { + dev_err(smmu->dev, + "failed to allocate smmu_device PTE cunters\n"); + return -ENOMEM; + } + as->pdir_page = alloc_page(GFP_KERNEL | __GFP_DMA); + if (!as->pdir_page) { + dev_err(smmu->dev, + "failed to allocate smmu_device page directory\n"); + devm_kfree(smmu->dev, as->pte_count); + as->pte_count = NULL; + return -ENOMEM; + } + SetPageReserved(as->pdir_page); + pdir = page_address(as->pdir_page); + + for (pdn = 0; pdn < SMMU_PDIR_COUNT; pdn++) + pdir[pdn] = _PDE_VACANT(pdn); + FLUSH_CPU_DCACHE(pdir, as->pdir_page, SMMU_PDIR_SIZE); + val = SMMU_PTC_FLUSH_TYPE_ADR | VA_PAGE_TO_PA(pdir, as->pdir_page); + smmu_write(smmu, val, SMMU_PTC_FLUSH); + FLUSH_SMMU_REGS(as->smmu); + val = SMMU_TLB_FLUSH_VA_MATCH_ALL | + SMMU_TLB_FLUSH_ASID_MATCH__ENABLE | + (as->asid << SMMU_TLB_FLUSH_ASID_SHIFT); + smmu_write(smmu, val, SMMU_TLB_FLUSH); + FLUSH_SMMU_REGS(as->smmu); + + return 0; +} + +static void __smmu_iommu_unmap(struct smmu_as *as, dma_addr_t iova) +{ + unsigned long *pte; + struct page *page; + unsigned int *count; + + pte = locate_pte(as, iova, false, &page, &count); + if (WARN_ON(!pte)) + return; + + if (WARN_ON(*pte == _PTE_VACANT(iova))) + return; + + *pte = _PTE_VACANT(iova); + FLUSH_CPU_DCACHE(pte, page, sizeof(*pte)); + flush_ptc_and_tlb(as->smmu, as, iova, pte, page, 0); + if (!--(*count)) { + free_ptbl(as, iova); + smmu_flush_regs(as->smmu, 0); + } +} + +static void __smmu_iommu_map_pfn(struct smmu_as *as, dma_addr_t iova, + unsigned long pfn) +{ + struct smmu_device *smmu = as->smmu; + unsigned long *pte; + unsigned int *count; + struct page *page; + + pte = locate_pte(as, iova, true, &page, &count); + if (WARN_ON(!pte)) + return; + + if (*pte == _PTE_VACANT(iova)) + (*count)++; + *pte = SMMU_PFN_TO_PTE(pfn, as->pte_attr); + if (unlikely((*pte == _PTE_VACANT(iova)))) + (*count)--; + FLUSH_CPU_DCACHE(pte, page, sizeof(*pte)); + flush_ptc_and_tlb(smmu, as, iova, pte, page, 0); + put_signature(as, iova, pfn); +} + +static int smmu_iommu_map(struct iommu_domain *domain, unsigned long iova, + phys_addr_t pa, size_t bytes, int prot) +{ + struct smmu_as *as = domain->priv; + unsigned long pfn = __phys_to_pfn(pa); + unsigned long flags; + + dev_dbg(as->smmu->dev, "[%d] %08lx:%08x\n", as->asid, iova, pa); + + if (!pfn_valid(pfn)) + return -ENOMEM; + + spin_lock_irqsave(&as->lock, flags); + __smmu_iommu_map_pfn(as, iova, pfn); + spin_unlock_irqrestore(&as->lock, flags); + return 0; +} + +static size_t smmu_iommu_unmap(struct iommu_domain *domain, unsigned long iova, + size_t bytes) +{ + struct smmu_as *as = domain->priv; + unsigned long flags; + + dev_dbg(as->smmu->dev, "[%d] %08lx\n", as->asid, iova); + + spin_lock_irqsave(&as->lock, flags); + __smmu_iommu_unmap(as, iova); + spin_unlock_irqrestore(&as->lock, flags); + return SMMU_PAGE_SIZE; +} + +static phys_addr_t smmu_iommu_iova_to_phys(struct iommu_domain *domain, + unsigned long iova) +{ + struct smmu_as *as = domain->priv; + unsigned long *pte; + unsigned int *count; + struct page *page; + unsigned long pfn; + unsigned long flags; + + spin_lock_irqsave(&as->lock, flags); + + pte = locate_pte(as, iova, true, &page, &count); + pfn = *pte & SMMU_PFN_MASK; + WARN_ON(!pfn_valid(pfn)); + dev_dbg(as->smmu->dev, + "iova:%08lx pfn:%08lx asid:%d\n", iova, pfn, as->asid); + + spin_unlock_irqrestore(&as->lock, flags); + return PFN_PHYS(pfn); +} + +static int smmu_iommu_domain_has_cap(struct iommu_domain *domain, + unsigned long cap) +{ + return 0; +} + +static int smmu_iommu_attach_dev(struct iommu_domain *domain, + struct device *dev) +{ + struct smmu_as *as = domain->priv; + struct smmu_device *smmu = as->smmu; + struct smmu_client *client, *c; + u32 map; + int err; + + client = devm_kzalloc(smmu->dev, sizeof(*c), GFP_KERNEL); + if (!client) + return -ENOMEM; + client->dev = dev; + client->as = as; + map = (unsigned long)dev->platform_data; + if (!map) + return -EINVAL; + + err = smmu_client_enable_hwgrp(client, map); + if (err) + goto err_hwgrp; + + spin_lock(&as->client_lock); + list_for_each_entry(c, &as->client, list) { + if (c->dev == dev) { + dev_err(smmu->dev, + "%s is already attached\n", dev_name(c->dev)); + err = -EINVAL; + goto err_client; + } + } + list_add(&client->list, &as->client); + spin_unlock(&as->client_lock); + + /* + * Reserve "page zero" for AVP vectors using a common dummy + * page. + */ + if (map & HWG_AVPC) { + struct page *page; + + page = as->smmu->avp_vector_page; + __smmu_iommu_map_pfn(as, 0, page_to_pfn(page)); + + pr_info("Reserve \"page zero\" for AVP vectors using a common dummy\n"); + } + + dev_dbg(smmu->dev, "%s is attached\n", dev_name(c->dev)); + return 0; + +err_client: + smmu_client_disable_hwgrp(client); + spin_unlock(&as->client_lock); +err_hwgrp: + devm_kfree(smmu->dev, client); + return err; +} + +static void smmu_iommu_detach_dev(struct iommu_domain *domain, + struct device *dev) +{ + struct smmu_as *as = domain->priv; + struct smmu_device *smmu = as->smmu; + struct smmu_client *c; + + spin_lock(&as->client_lock); + + list_for_each_entry(c, &as->client, list) { + if (c->dev == dev) { + smmu_client_disable_hwgrp(c); + list_del(&c->list); + devm_kfree(smmu->dev, c); + c->as = NULL; + dev_dbg(smmu->dev, + "%s is detached\n", dev_name(c->dev)); + goto out; + } + } + dev_err(smmu->dev, "Couldn't find %s\n", dev_name(c->dev)); +out: + spin_unlock(&as->client_lock); +} + +static int smmu_iommu_domain_init(struct iommu_domain *domain) +{ + int i; + unsigned long flags; + struct smmu_as *as; + struct smmu_device *smmu = smmu_handle; + + /* Look for a free AS with lock held */ + for (i = 0; i < smmu->num_as; i++) { + struct smmu_as *tmp = &smmu->as[i]; + + spin_lock_irqsave(&tmp->lock, flags); + if (!tmp->pdir_page) { + as = tmp; + goto found; + } + spin_unlock_irqrestore(&tmp->lock, flags); + } + dev_err(smmu->dev, "no free AS\n"); + return -ENODEV; + +found: + if (alloc_pdir(as) < 0) + goto err_alloc_pdir; + + spin_lock(&smmu->lock); + + /* Update PDIR register */ + smmu_write(smmu, SMMU_PTB_ASID_CUR(as->asid), SMMU_PTB_ASID); + smmu_write(smmu, + SMMU_MK_PDIR(as->pdir_page, as->pdir_attr), SMMU_PTB_DATA); + FLUSH_SMMU_REGS(smmu); + + spin_unlock(&smmu->lock); + + spin_unlock_irqrestore(&as->lock, flags); + domain->priv = as; + + dev_dbg(smmu->dev, "smmu_as@%p\n", as); + return 0; + +err_alloc_pdir: + spin_unlock_irqrestore(&as->lock, flags); + return -ENODEV; +} + +static void smmu_iommu_domain_destroy(struct iommu_domain *domain) +{ + struct smmu_as *as = domain->priv; + struct smmu_device *smmu = as->smmu; + unsigned long flags; + + spin_lock_irqsave(&as->lock, flags); + + if (as->pdir_page) { + spin_lock(&smmu->lock); + smmu_write(smmu, SMMU_PTB_ASID_CUR(as->asid), SMMU_PTB_ASID); + smmu_write(smmu, SMMU_PTB_DATA_RESET_VAL, SMMU_PTB_DATA); + FLUSH_SMMU_REGS(smmu); + spin_unlock(&smmu->lock); + + free_pdir(as); + } + + if (!list_empty(&as->client)) { + struct smmu_client *c; + + list_for_each_entry(c, &as->client, list) + smmu_iommu_detach_dev(domain, c->dev); + } + + spin_unlock_irqrestore(&as->lock, flags); + + domain->priv = NULL; + dev_dbg(smmu->dev, "smmu_as@%p\n", as); +} + +static struct iommu_ops smmu_iommu_ops = { + .domain_init = smmu_iommu_domain_init, + .domain_destroy = smmu_iommu_domain_destroy, + .attach_dev = smmu_iommu_attach_dev, + .detach_dev = smmu_iommu_detach_dev, + .map = smmu_iommu_map, + .unmap = smmu_iommu_unmap, + .iova_to_phys = smmu_iommu_iova_to_phys, + .domain_has_cap = smmu_iommu_domain_has_cap, + .pgsize_bitmap = SMMU_IOMMU_PGSIZES, +}; + +static int tegra_smmu_suspend(struct device *dev) +{ + struct smmu_device *smmu = dev_get_drvdata(dev); + + smmu->translation_enable_0 = smmu_read(smmu, SMMU_TRANSLATION_ENABLE_0); + smmu->translation_enable_1 = smmu_read(smmu, SMMU_TRANSLATION_ENABLE_1); + smmu->translation_enable_2 = smmu_read(smmu, SMMU_TRANSLATION_ENABLE_2); + smmu->asid_security = smmu_read(smmu, SMMU_ASID_SECURITY); + return 0; +} + +static int tegra_smmu_resume(struct device *dev) +{ + struct smmu_device *smmu = dev_get_drvdata(dev); + unsigned long flags; + + spin_lock_irqsave(&smmu->lock, flags); + smmu_setup_regs(smmu); + spin_unlock_irqrestore(&smmu->lock, flags); + return 0; +} + +static int tegra_smmu_probe(struct platform_device *pdev) +{ + struct smmu_device *smmu; + struct resource *regs, *regs2, *window; + struct device *dev = &pdev->dev; + int i, err = 0; + + if (smmu_handle) + return -EIO; + + BUILD_BUG_ON(PAGE_SHIFT != SMMU_PAGE_SHIFT); + + regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); + regs2 = platform_get_resource(pdev, IORESOURCE_MEM, 1); + window = platform_get_resource(pdev, IORESOURCE_MEM, 2); + if (!regs || !regs2 || !window) { + dev_err(dev, "No SMMU resources\n"); + return -ENODEV; + } + + smmu = devm_kzalloc(dev, sizeof(*smmu), GFP_KERNEL); + if (!smmu) { + dev_err(dev, "failed to allocate smmu_device\n"); + return -ENOMEM; + } + + smmu->dev = dev; + smmu->num_as = SMMU_NUM_ASIDS; + smmu->iovmm_base = (unsigned long)window->start; + smmu->page_count = resource_size(window) >> SMMU_PAGE_SHIFT; + smmu->regs = devm_ioremap(dev, regs->start, resource_size(regs)); + smmu->regs_ahbarb = devm_ioremap(dev, regs2->start, + resource_size(regs2)); + if (!smmu->regs || !smmu->regs_ahbarb) { + dev_err(dev, "failed to remap SMMU registers\n"); + err = -ENXIO; + goto fail; + } + + smmu->translation_enable_0 = ~0; + smmu->translation_enable_1 = ~0; + smmu->translation_enable_2 = ~0; + smmu->asid_security = 0; + + smmu->as = devm_kzalloc(dev, + sizeof(smmu->as[0]) * smmu->num_as, GFP_KERNEL); + if (!smmu->as) { + dev_err(dev, "failed to allocate smmu_as\n"); + err = -ENOMEM; + goto fail; + } + + for (i = 0; i < smmu->num_as; i++) { + struct smmu_as *as = &smmu->as[i]; + + as->smmu = smmu; + as->asid = i; + as->pdir_attr = _PDIR_ATTR; + as->pde_attr = _PDE_ATTR; + as->pte_attr = _PTE_ATTR; + + spin_lock_init(&as->lock); + INIT_LIST_HEAD(&as->client); + } + spin_lock_init(&smmu->lock); + smmu_setup_regs(smmu); + platform_set_drvdata(pdev, smmu); + + smmu->avp_vector_page = alloc_page(GFP_KERNEL); + if (!smmu->avp_vector_page) + goto fail; + + smmu_handle = smmu; + return 0; + +fail: + if (smmu->avp_vector_page) + __free_page(smmu->avp_vector_page); + if (smmu->regs) + devm_iounmap(dev, smmu->regs); + if (smmu->regs_ahbarb) + devm_iounmap(dev, smmu->regs_ahbarb); + if (smmu && smmu->as) { + for (i = 0; i < smmu->num_as; i++) { + if (smmu->as[i].pdir_page) { + ClearPageReserved(smmu->as[i].pdir_page); + __free_page(smmu->as[i].pdir_page); + } + } + devm_kfree(dev, smmu->as); + } + devm_kfree(dev, smmu); + return err; +} + +static int tegra_smmu_remove(struct platform_device *pdev) +{ + struct smmu_device *smmu = platform_get_drvdata(pdev); + struct device *dev = smmu->dev; + + smmu_write(smmu, SMMU_CONFIG_DISABLE, SMMU_CONFIG); + platform_set_drvdata(pdev, NULL); + if (smmu->as) { + int i; + + for (i = 0; i < smmu->num_as; i++) + free_pdir(&smmu->as[i]); + devm_kfree(dev, smmu->as); + } + if (smmu->avp_vector_page) + __free_page(smmu->avp_vector_page); + if (smmu->regs) + devm_iounmap(dev, smmu->regs); + if (smmu->regs_ahbarb) + devm_iounmap(dev, smmu->regs_ahbarb); + devm_kfree(dev, smmu); + smmu_handle = NULL; + return 0; +} + +const struct dev_pm_ops tegra_smmu_pm_ops = { + .suspend = tegra_smmu_suspend, + .resume = tegra_smmu_resume, +}; + +static struct platform_driver tegra_smmu_driver = { + .probe = tegra_smmu_probe, + .remove = tegra_smmu_remove, + .driver = { + .owner = THIS_MODULE, + .name = "tegra-smmu", + .pm = &tegra_smmu_pm_ops, + }, +}; + +static int __devinit tegra_smmu_init(void) +{ + bus_set_iommu(&platform_bus_type, &smmu_iommu_ops); + return platform_driver_register(&tegra_smmu_driver); +} + +static void __exit tegra_smmu_exit(void) +{ + platform_driver_unregister(&tegra_smmu_driver); +} + +subsys_initcall(tegra_smmu_init); +module_exit(tegra_smmu_exit); + +MODULE_DESCRIPTION("IOMMU API for SMMU in Tegra30"); +MODULE_AUTHOR("Hiroshi DOYU <hdoyu@nvidia.com>"); +MODULE_LICENSE("GPL v2"); |