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-rw-r--r--Documentation/devicetree/bindings/iommu/nvidia,tegra30-smmu.txt21
-rw-r--r--drivers/iommu/Kconfig2
-rw-r--r--drivers/iommu/tegra-smmu.c149
3 files changed, 117 insertions, 55 deletions
diff --git a/Documentation/devicetree/bindings/iommu/nvidia,tegra30-smmu.txt b/Documentation/devicetree/bindings/iommu/nvidia,tegra30-smmu.txt
new file mode 100644
index 000000000000..89fb5434b730
--- /dev/null
+++ b/Documentation/devicetree/bindings/iommu/nvidia,tegra30-smmu.txt
@@ -0,0 +1,21 @@
+NVIDIA Tegra 30 IOMMU H/W, SMMU (System Memory Management Unit)
+
+Required properties:
+- compatible : "nvidia,tegra30-smmu"
+- reg : Should contain 3 register banks(address and length) for each
+ of the SMMU register blocks.
+- interrupts : Should contain MC General interrupt.
+- nvidia,#asids : # of ASIDs
+- dma-window : IOVA start address and length.
+- nvidia,ahb : phandle to the ahb bus connected to SMMU.
+
+Example:
+ smmu {
+ compatible = "nvidia,tegra30-smmu";
+ reg = <0x7000f010 0x02c
+ 0x7000f1f0 0x010
+ 0x7000f228 0x05c>;
+ nvidia,#asids = <4>; /* # of ASIDs */
+ dma-window = <0 0x40000000>; /* IOVA start & length */
+ nvidia,ahb = <&ahb>;
+ };
diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index 4826af62a9de..9f69b561f5db 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -158,7 +158,7 @@ config TEGRA_IOMMU_GART
config TEGRA_IOMMU_SMMU
bool "Tegra SMMU IOMMU Support"
- depends on ARCH_TEGRA_3x_SOC
+ depends on ARCH_TEGRA_3x_SOC && TEGRA_AHB
select IOMMU_API
help
Enables support for remapping discontiguous physical memory
diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c
index ecd679043d77..2c92b8c3514e 100644
--- a/drivers/iommu/tegra-smmu.c
+++ b/drivers/iommu/tegra-smmu.c
@@ -30,12 +30,15 @@
#include <linux/sched.h>
#include <linux/iommu.h>
#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_iommu.h>
#include <asm/page.h>
#include <asm/cacheflush.h>
#include <mach/iomap.h>
#include <mach/smmu.h>
+#include <mach/tegra-ahb.h>
/* bitmap of the page sizes currently supported */
#define SMMU_IOMMU_PGSIZES (SZ_4K)
@@ -111,12 +114,6 @@
#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
@@ -136,6 +133,7 @@
#define SMMU_PAGE_SHIFT 12
#define SMMU_PAGE_SIZE (1 << SMMU_PAGE_SHIFT)
+#define SMMU_PAGE_MASK ((1 << SMMU_PAGE_SHIFT) - 1)
#define SMMU_PDIR_COUNT 1024
#define SMMU_PDIR_SIZE (sizeof(unsigned long) * SMMU_PDIR_COUNT)
@@ -177,6 +175,8 @@
#define SMMU_ASID_DISABLE 0
#define SMMU_ASID_ASID(n) ((n) & ~SMMU_ASID_ENABLE(0))
+#define NUM_SMMU_REG_BANKS 3
+
#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)
@@ -235,7 +235,7 @@ struct smmu_as {
* Per SMMU device - IOMMU device
*/
struct smmu_device {
- void __iomem *regs, *regs_ahbarb;
+ void __iomem *regs[NUM_SMMU_REG_BANKS];
unsigned long iovmm_base; /* remappable base address */
unsigned long page_count; /* total remappable size */
spinlock_t lock;
@@ -252,29 +252,47 @@ struct smmu_device {
unsigned long translation_enable_1;
unsigned long translation_enable_2;
unsigned long asid_security;
+
+ struct device_node *ahb;
};
static struct smmu_device *smmu_handle; /* unique for a system */
/*
- * SMMU/AHB register accessors
+ * SMMU 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);
+ BUG_ON(offs < 0x10);
+ if (offs < 0x3c)
+ return readl(smmu->regs[0] + offs - 0x10);
+ BUG_ON(offs < 0x1f0);
+ if (offs < 0x200)
+ return readl(smmu->regs[1] + offs - 0x1f0);
+ BUG_ON(offs < 0x228);
+ if (offs < 0x284)
+ return readl(smmu->regs[2] + offs - 0x228);
+ BUG();
}
-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)
+static inline void smmu_write(struct smmu_device *smmu, u32 val, size_t offs)
{
- writel(val, smmu->regs_ahbarb + offs);
+ BUG_ON(offs < 0x10);
+ if (offs < 0x3c) {
+ writel(val, smmu->regs[0] + offs - 0x10);
+ return;
+ }
+ BUG_ON(offs < 0x1f0);
+ if (offs < 0x200) {
+ writel(val, smmu->regs[1] + offs - 0x1f0);
+ return;
+ }
+ BUG_ON(offs < 0x228);
+ if (offs < 0x284) {
+ writel(val, smmu->regs[2] + offs - 0x228);
+ return;
+ }
+ BUG();
}
#define VA_PAGE_TO_PA(va, page) \
@@ -370,7 +388,7 @@ static void smmu_flush_regs(struct smmu_device *smmu, int enable)
FLUSH_SMMU_REGS(smmu);
}
-static void smmu_setup_regs(struct smmu_device *smmu)
+static int smmu_setup_regs(struct smmu_device *smmu)
{
int i;
u32 val;
@@ -398,10 +416,7 @@ static void smmu_setup_regs(struct smmu_device *smmu)
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);
+ return tegra_ahb_enable_smmu(smmu->ahb);
}
static void flush_ptc_and_tlb(struct smmu_device *smmu,
@@ -873,52 +888,72 @@ static int tegra_smmu_resume(struct device *dev)
{
struct smmu_device *smmu = dev_get_drvdata(dev);
unsigned long flags;
+ int err;
spin_lock_irqsave(&smmu->lock, flags);
- smmu_setup_regs(smmu);
+ err = smmu_setup_regs(smmu);
spin_unlock_irqrestore(&smmu->lock, flags);
- return 0;
+ return err;
}
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;
+ int i, asids, err = 0;
+ dma_addr_t base;
+ size_t size;
+ const void *prop;
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;
+ for (i = 0; i < ARRAY_SIZE(smmu->regs); i++) {
+ struct resource *res;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, i);
+ if (!res)
+ return -ENODEV;
+ smmu->regs[i] = devm_request_and_ioremap(&pdev->dev, res);
+ if (!smmu->regs[i])
+ return -EBUSY;
}
+ err = of_get_dma_window(dev->of_node, NULL, 0, NULL, &base, &size);
+ if (err)
+ return -ENODEV;
+
+ if (size & SMMU_PAGE_MASK)
+ return -EINVAL;
+
+ size >>= SMMU_PAGE_SHIFT;
+ if (!size)
+ return -EINVAL;
+
+ prop = of_get_property(dev->of_node, "nvidia,#asids", NULL);
+ if (!prop)
+ return -ENODEV;
+ asids = be32_to_cpup(prop);
+ if (!asids)
+ return -ENODEV;
+
+ smmu->ahb = of_parse_phandle(dev->of_node, "nvidia,ahb", 0);
+ if (!smmu->ahb)
+ return -ENODEV;
+
+ smmu->dev = dev;
+ smmu->num_as = asids;
+ smmu->iovmm_base = base;
+ smmu->page_count = size;
+
smmu->translation_enable_0 = ~0;
smmu->translation_enable_1 = ~0;
smmu->translation_enable_2 = ~0;
@@ -945,7 +980,9 @@ static int tegra_smmu_probe(struct platform_device *pdev)
INIT_LIST_HEAD(&as->client);
}
spin_lock_init(&smmu->lock);
- smmu_setup_regs(smmu);
+ err = smmu_setup_regs(smmu);
+ if (err)
+ goto fail;
platform_set_drvdata(pdev, smmu);
smmu->avp_vector_page = alloc_page(GFP_KERNEL);
@@ -958,10 +995,6 @@ static int tegra_smmu_probe(struct platform_device *pdev)
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) {
@@ -993,8 +1026,6 @@ static int tegra_smmu_remove(struct platform_device *pdev)
__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;
@@ -1005,6 +1036,14 @@ const struct dev_pm_ops tegra_smmu_pm_ops = {
.resume = tegra_smmu_resume,
};
+#ifdef CONFIG_OF
+static struct of_device_id tegra_smmu_of_match[] __devinitdata = {
+ { .compatible = "nvidia,tegra30-smmu", },
+ { },
+};
+MODULE_DEVICE_TABLE(of, tegra_smmu_of_match);
+#endif
+
static struct platform_driver tegra_smmu_driver = {
.probe = tegra_smmu_probe,
.remove = tegra_smmu_remove,
@@ -1012,6 +1051,7 @@ static struct platform_driver tegra_smmu_driver = {
.owner = THIS_MODULE,
.name = "tegra-smmu",
.pm = &tegra_smmu_pm_ops,
+ .of_match_table = of_match_ptr(tegra_smmu_of_match),
},
};
@@ -1031,4 +1071,5 @@ module_exit(tegra_smmu_exit);
MODULE_DESCRIPTION("IOMMU API for SMMU in Tegra30");
MODULE_AUTHOR("Hiroshi DOYU <hdoyu@nvidia.com>");
+MODULE_ALIAS("platform:tegra-smmu");
MODULE_LICENSE("GPL v2");
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-12 10:49:52 +0300