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Subject[PATCH v8 07/12] iommu/exynos: support for device tree
Date
This commit adds device tree support for System MMU.
This also include the following changes and enhancements:

* use managed device helper functions.
Simplyfies System MMU device driver.

* use only a single clock descriptor.
System MMU device descriptor is seperate if it is imposible to make
a single clock descriptor to make a device descriptor for a group of
System MMUs.

* removed dbgname member from sysmmu_drvdata structure.
debugging kernel message for a System MMU is distinguisheable with the
name of device descroptors.

Signed-off-by: Cho KyongHo <pullip.cho@samsung.com>
---
drivers/iommu/Kconfig | 5 +-
drivers/iommu/exynos-iommu.c | 182 ++++++++++++++++--------------------------
2 files changed, 70 insertions(+), 117 deletions(-)

diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index c332fb9..d45f3c9 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -168,16 +168,15 @@ config TEGRA_IOMMU_SMMU

config EXYNOS_IOMMU
bool "Exynos IOMMU Support"
- depends on ARCH_EXYNOS && EXYNOS_DEV_SYSMMU
+ depends on ARCH_EXYNOS
select IOMMU_API
+ default n
help
Support for the IOMMU(System MMU) of Samsung Exynos application
processor family. This enables H/W multimedia accellerators to see
non-linear physical memory chunks as a linear memory in their
address spaces

- If unsure, say N here.
-
config EXYNOS_IOMMU_DEBUG
bool "Debugging log for Exynos IOMMU"
depends on EXYNOS_IOMMU
diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
index 093eea5..cfc02ed 100644
--- a/drivers/iommu/exynos-iommu.c
+++ b/drivers/iommu/exynos-iommu.c
@@ -26,6 +26,7 @@
#include <linux/list.h>
#include <linux/memblock.h>
#include <linux/export.h>
+#include <linux/of.h>

#include <asm/cacheflush.h>
#include <asm/pgtable.h>
@@ -170,15 +171,14 @@ struct sysmmu_drvdata {
struct list_head node; /* entry of exynos_iommu_domain.clients */
struct device *sysmmu; /* System MMU's device descriptor */
struct device *dev; /* Owner of system MMU */
- char *dbgname;
int nsfrs;
- void __iomem **sfrbases;
- struct clk *clk[2];
+ struct clk *clk;
int activations;
rwlock_t lock;
struct iommu_domain *domain;
sysmmu_fault_handler_t fault_handler;
unsigned long pgtable;
+ void __iomem *sfrbases[0];
};

static bool set_sysmmu_active(struct sysmmu_drvdata *data)
@@ -385,8 +385,8 @@ static irqreturn_t exynos_sysmmu_irq(int irq, void *dev_id)
if (!ret && (itype != SYSMMU_FAULT_UNKNOWN))
__raw_writel(1 << itype, data->sfrbases[i] + REG_INT_CLEAR);
else
- dev_dbg(data->sysmmu, "(%s) %s is not handled.\n",
- data->dbgname, sysmmu_fault_name[itype]);
+ dev_dbg(data->sysmmu, "%s is not handled.\n",
+ sysmmu_fault_name[itype]);

if (itype != SYSMMU_FAULT_UNKNOWN)
sysmmu_unblock(data->sfrbases[i]);
@@ -410,10 +410,8 @@ static bool __exynos_sysmmu_disable(struct sysmmu_drvdata *data)
for (i = 0; i < data->nsfrs; i++)
__raw_writel(CTRL_DISABLE, data->sfrbases[i] + REG_MMU_CTRL);

- if (data->clk[1])
- clk_disable(data->clk[1]);
- if (data->clk[0])
- clk_disable(data->clk[0]);
+ if (data->clk)
+ clk_disable(data->clk);

disabled = true;
data->pgtable = 0;
@@ -422,10 +420,10 @@ finish:
write_unlock_irqrestore(&data->lock, flags);

if (disabled)
- dev_dbg(data->sysmmu, "(%s) Disabled\n", data->dbgname);
+ dev_dbg(data->sysmmu, "Disabled\n");
else
- dev_dbg(data->sysmmu, "(%s) %d times left to be disabled\n",
- data->dbgname, data->activations);
+ dev_dbg(data->sysmmu, "%d times left to be disabled\n",
+ data->activations);

return disabled;
}
@@ -452,14 +450,12 @@ static int __exynos_sysmmu_enable(struct sysmmu_drvdata *data,
ret = 1;
}

- dev_dbg(data->sysmmu, "(%s) Already enabled\n", data->dbgname);
+ dev_dbg(data->sysmmu, "Already enabled\n");
goto finish;
}

- if (data->clk[0])
- clk_enable(data->clk[0]);
- if (data->clk[1])
- clk_enable(data->clk[1]);
+ if (data->clk)
+ clk_enable(data->clk);

data->pgtable = pgtable;

@@ -479,7 +475,7 @@ static int __exynos_sysmmu_enable(struct sysmmu_drvdata *data,

data->domain = domain;

- dev_dbg(data->sysmmu, "(%s) Enabled\n", data->dbgname);
+ dev_dbg(data->sysmmu, "Enabled\n");
finish:
write_unlock_irqrestore(&data->lock, flags);

@@ -495,7 +491,7 @@ int exynos_sysmmu_enable(struct device *dev, unsigned long pgtable)

ret = pm_runtime_get_sync(data->sysmmu);
if (ret < 0) {
- dev_dbg(data->sysmmu, "(%s) Failed to enable\n", data->dbgname);
+ dev_dbg(data->sysmmu, "Failed to enable\n");
return ret;
}

@@ -503,8 +499,8 @@ int exynos_sysmmu_enable(struct device *dev, unsigned long pgtable)
if (WARN_ON(ret < 0)) {
pm_runtime_put(data->sysmmu);
dev_err(data->sysmmu,
- "(%s) Already enabled with page table %#lx\n",
- data->dbgname, data->pgtable);
+ "Already enabled with page table %#lx\n",
+ data->pgtable);
} else {
data->dev = dev;
}
@@ -540,9 +536,7 @@ static void sysmmu_tlb_invalidate_entry(struct device *dev, unsigned long iova)
}
}
} else {
- dev_dbg(data->sysmmu,
- "(%s) Disabled. Skipping invalidating TLB.\n",
- data->dbgname);
+ dev_dbg(data->sysmmu, "Disabled. Skipping invalidating TLB.\n");
}

read_unlock_irqrestore(&data->lock, flags);
@@ -564,141 +558,101 @@ void exynos_sysmmu_tlb_invalidate(struct device *dev)
}
}
} else {
- dev_dbg(data->sysmmu,
- "(%s) Disabled. Skipping invalidating TLB.\n",
- data->dbgname);
+ dev_dbg(data->sysmmu, "Disabled. Skipping invalidating TLB.\n");
}

read_unlock_irqrestore(&data->lock, flags);
}

-static int exynos_sysmmu_probe(struct platform_device *pdev)
+static int __init exynos_sysmmu_probe(struct platform_device *pdev)
{
int i, ret;
- struct device *dev;
+ struct device *dev = &pdev->dev;
struct sysmmu_drvdata *data;

- dev = &pdev->dev;
-
- data = kzalloc(sizeof(*data), GFP_KERNEL);
- if (!data) {
- dev_dbg(dev, "Not enough memory\n");
- ret = -ENOMEM;
- goto err_alloc;
+ if (pdev->num_resources == 0) {
+ dev_err(dev, "No System MMU resource defined\n");
+ return -ENODEV;
}

- ret = dev_set_drvdata(dev, data);
- if (ret) {
- dev_dbg(dev, "Unabled to initialize driver data\n");
- goto err_init;
+ data = devm_kzalloc(dev,
+ sizeof(*data) +
+ sizeof(*data->sfrbases) * (pdev->num_resources / 2),
+ GFP_KERNEL);
+ if (!data) {
+ dev_err(dev, "Not enough memory for initialization\n");
+ return -ENOMEM;
}

data->nsfrs = pdev->num_resources / 2;
- data->sfrbases = kmalloc(sizeof(*data->sfrbases) * data->nsfrs,
- GFP_KERNEL);
- if (data->sfrbases == NULL) {
- dev_dbg(dev, "Not enough memory\n");
- ret = -ENOMEM;
- goto err_init;
- }

for (i = 0; i < data->nsfrs; i++) {
struct resource *res;
+
res = platform_get_resource(pdev, IORESOURCE_MEM, i);
if (!res) {
- dev_dbg(dev, "Unable to find IOMEM region\n");
- ret = -ENOENT;
- goto err_res;
+ dev_err(dev, "Unable to find IOMEM region\n");
+ return -ENOENT;
}

- data->sfrbases[i] = ioremap(res->start, resource_size(res));
+ data->sfrbases[i] = devm_request_and_ioremap(dev, res);
if (!data->sfrbases[i]) {
- dev_dbg(dev, "Unable to map IOMEM @ PA:%#x\n",
- res->start);
- ret = -ENOENT;
- goto err_res;
+ dev_err(dev, "Unable to map IOMEM @ %#x\n", res->start);
+ return -EBUSY;
}
}

for (i = 0; i < data->nsfrs; i++) {
- ret = platform_get_irq(pdev, i);
- if (ret <= 0) {
- dev_dbg(dev, "Unable to find IRQ resource\n");
- goto err_irq;
+ int irq;
+
+ irq = platform_get_irq(pdev, i);
+ if (irq <= 0) {
+ dev_err(dev, "Unable to find IRQ resource\n");
+ return -ENOENT;
}

- ret = request_irq(ret, exynos_sysmmu_irq, 0,
- dev_name(dev), data);
+ ret = devm_request_irq(dev, irq, exynos_sysmmu_irq,
+ 0, dev_name(dev), data);
if (ret) {
- dev_dbg(dev, "Unabled to register interrupt handler\n");
- goto err_irq;
+ dev_err(dev, "Unable to register handler to irq %d\n",
+ irq);
+ return ret;
}
}

- if (dev_get_platdata(dev)) {
- char *deli, *beg;
- struct sysmmu_platform_data *platdata = dev_get_platdata(dev);
-
- beg = platdata->clockname;
-
- for (deli = beg; (*deli != '\0') && (*deli != ','); deli++)
- /* NOTHING */;
-
- if (*deli == '\0')
- deli = NULL;
- else
- *deli = '\0';
-
- data->clk[0] = clk_get(dev, beg);
- if (IS_ERR(data->clk[0])) {
- data->clk[0] = NULL;
- dev_dbg(dev, "No clock descriptor registered\n");
- }
+ pm_runtime_enable(dev);

- if (data->clk[0] && deli) {
- *deli = ',';
- data->clk[1] = clk_get(dev, deli + 1);
- if (IS_ERR(data->clk[1]))
- data->clk[1] = NULL;
- }
+ __set_fault_handler(data, &default_fault_handler);

- data->dbgname = platdata->dbgname;
+ data->sysmmu = dev;
+ data->clk = devm_clk_get(dev, "sysmmu");
+ if (IS_ERR(data->clk)) {
+ dev_info(dev, "No gate clock found!\n");
+ data->clk = NULL;
}

- data->sysmmu = dev;
rwlock_init(&data->lock);
INIT_LIST_HEAD(&data->node);

- __set_fault_handler(data, &default_fault_handler);
-
- if (dev->parent)
- pm_runtime_enable(dev);
+ platform_set_drvdata(pdev, data);
+ dev_dbg(dev, "Probed and initialized\n");

- dev_dbg(dev, "(%s) Initialized\n", data->dbgname);
- return 0;
-err_irq:
- while (i-- > 0) {
- int irq;
-
- irq = platform_get_irq(pdev, i);
- free_irq(irq, data);
- }
-err_res:
- while (data->nsfrs-- > 0)
- iounmap(data->sfrbases[data->nsfrs]);
- kfree(data->sfrbases);
-err_init:
- kfree(data);
-err_alloc:
- dev_err(dev, "Failed to initialize\n");
return ret;
}

-static struct platform_driver exynos_sysmmu_driver = {
- .probe = exynos_sysmmu_probe,
- .driver = {
+#ifdef CONFIG_OF
+static struct of_device_id sysmmu_of_match[] __initconst = {
+ { .compatible = "samsung,exynos4210-sysmmu", },
+ { },
+};
+#endif
+
+static struct platform_driver exynos_sysmmu_driver __refdata = {
+ .probe = exynos_sysmmu_probe,
+ .driver = {
.owner = THIS_MODULE,
.name = "exynos-sysmmu",
+ .of_match_table = of_match_ptr(sysmmu_of_match),
}
};

--
1.7.2.5



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