[PATCH v2 04/12] iommu/exynos: support for device tree
From: Cho KyongHo
Date: Tue Nov 20 2012 - 02:32:31 EST
This commit adds device tree support for System MMU.
Signed-off-by: KyongHo Cho <pullip.cho@xxxxxxxxxxx>
---
drivers/iommu/Kconfig | 2 +-
drivers/iommu/exynos-iommu.c | 286 ++++++++++++++++++++++++++-----------------
2 files changed, 177 insertions(+), 111 deletions(-)
diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index e39f9db..64586f1 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -168,7 +168,7 @@ 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
help
Support for the IOMMU(System MMU) of Samsung Exynos application
diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
index 7fe44f8..8cffeff 100644
--- a/drivers/iommu/exynos-iommu.c
+++ b/drivers/iommu/exynos-iommu.c
@@ -1,6 +1,6 @@
-/* linux/drivers/iommu/exynos_iommu.c
+/* linux/drivers/iommu/exynos-iommu.c
*
- * Copyright (c) 2011 Samsung Electronics Co., Ltd.
+ * Copyright (c) 2011-2012 Samsung Electronics Co., Ltd.
* http://www.samsung.com
*
* This program is free software; you can redistribute it and/or modify
@@ -12,6 +12,7 @@
#define DEBUG
#endif
+#include <linux/kernel.h>
#include <linux/io.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
@@ -25,11 +26,10 @@
#include <linux/list.h>
#include <linux/memblock.h>
#include <linux/export.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
#include <asm/cacheflush.h>
-#include <asm/pgtable.h>
-
-#include <mach/sysmmu.h>
/* We does not consider super section mapping (16MB) */
#define SECT_ORDER 20
@@ -169,15 +169,14 @@ 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)
@@ -384,8 +383,8 @@ 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]);
@@ -409,10 +408,8 @@ 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;
@@ -421,10 +418,10 @@ 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;
}
@@ -451,14 +448,12 @@ 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;
@@ -478,7 +473,7 @@ 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);
@@ -494,7 +489,7 @@ 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;
}
@@ -502,8 +497,8 @@ 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;
}
@@ -540,8 +535,7 @@ 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);
+ "Disabled. Skipping invalidating TLB.\n");
}
read_unlock_irqrestore(&data->lock, flags);
@@ -564,140 +558,212 @@ void exynos_sysmmu_tlb_invalidate(struct device *dev)
}
} else {
dev_dbg(data->sysmmu,
- "(%s) Disabled. Skipping invalidating TLB.\n",
- data->dbgname);
+ "Disabled. Skipping invalidating TLB.\n");
}
read_unlock_irqrestore(&data->lock, flags);
}
-static int exynos_sysmmu_probe(struct platform_device *pdev)
+static int __init __sysmmu_init_clock(struct device *sysmmu,
+ struct sysmmu_drvdata *drvdata,
+ struct device *master)
+{
+ char *conid;
+ struct clk *parent_clk;
+ int ret;
+
+ drvdata->clk = clk_get(sysmmu, "sysmmu");
+ if (IS_ERR(drvdata->clk)) {
+ dev_dbg(sysmmu, "No gating clock found.\n");
+ drvdata->clk = NULL;
+ return 0;
+ }
+
+ if (!master)
+ return 0;
+
+ conid = dev_get_platdata(sysmmu);
+ if (!conid) {
+ dev_dbg(sysmmu, "No parent clock specified.\n");
+ return 0;
+ }
+
+ parent_clk = clk_get(master, conid);
+ if (IS_ERR(parent_clk)) {
+ parent_clk = clk_get(NULL, conid);
+ if (IS_ERR(parent_clk)) {
+ clk_put(drvdata->clk);
+ dev_err(sysmmu, "No parent clock '%s,%s' found\n",
+ dev_name(master), conid);
+ return PTR_ERR(parent_clk);
+ }
+ }
+
+ ret = clk_set_parent(drvdata->clk, parent_clk);
+ if (ret) {
+ clk_put(drvdata->clk);
+ dev_err(sysmmu, "Failed to set parent clock '%s,%s'\n",
+ dev_name(master), conid);
+ }
+
+ clk_put(parent_clk);
+
+ return ret;
+}
+
+static int __init __sysmmu_setup(struct device *sysmmu,
+ struct sysmmu_drvdata *drvdata)
+{
+ struct device_node *master_node;
+ const char *compat;
+ struct platform_device *pmaster = NULL;
+ u32 master_inst_no = -1;
+ int ret;
+
+ master_node = of_parse_phandle(sysmmu->of_node, "mmu-master", 0);
+ if (!master_node && !of_property_read_string(
+ sysmmu->of_node, "mmu-master-compat", &compat)) {
+ of_property_read_u32_array(sysmmu->of_node,
+ "mmu-master-no", &master_inst_no, 1);
+ for_each_compatible_node(master_node, NULL, compat) {
+ pmaster = of_find_device_by_node(master_node);
+ if (pmaster && (pmaster->id == master_inst_no))
+ break;
+ of_dev_put(pmaster);
+ pmaster = NULL;
+ }
+ } else if (master_node) {
+ pmaster = of_find_device_by_node(master_node);
+ }
+
+ if (!pmaster) {
+ dev_dbg(sysmmu, "No master device is specified.\n");
+ return __sysmmu_init_clock(sysmmu, drvdata, NULL);
+ }
+
+ pmaster->dev.archdata.iommu = sysmmu;
+
+ ret = __sysmmu_init_clock(sysmmu, drvdata, &pmaster->dev);
+ if (ret)
+ dev_err(sysmmu, "Failed to initialize gating clocks\n");
+
+ of_dev_put(pmaster);
+
+ return ret;
+}
+
+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;
+ if (pdev->num_resources == 0) {
+ dev_err(dev, "No System MMU resource defined\n");
+ return -ENODEV;
+ }
- data = kzalloc(sizeof(*data), GFP_KERNEL);
+ data = devm_kzalloc(dev,
+ sizeof(*data)
+ + sizeof(*data->sfrbases) * (pdev->num_resources / 2),
+ GFP_KERNEL);
if (!data) {
- dev_dbg(dev, "Not enough memory\n");
- ret = -ENOMEM;
- goto err_alloc;
+ dev_err(dev, "Not enough memory\n");
+ return -ENOMEM;
}
ret = dev_set_drvdata(dev, data);
if (ret) {
dev_dbg(dev, "Unabled to initialize driver data\n");
- goto err_init;
+ return ret;
}
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",
+ dev_err(dev, "Unable to map IOMEM @ PA:%#x\n",
res->start);
- ret = -ENOENT;
- goto err_res;
+ 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;
+ dev_err(dev, "Unable to find IRQ resource\n");
+ return ret;
}
- ret = request_irq(ret, exynos_sysmmu_irq, 0,
+ ret = devm_request_irq(dev, ret, 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, "Unabled to register interrupt handler\n");
+ return ret;
}
}
- if (dev_get_platdata(dev)) {
- char *deli, *beg;
- struct sysmmu_platform_data *platdata = dev_get_platdata(dev);
-
- beg = platdata->clockname;
+ pm_runtime_enable(dev);
- for (deli = beg; (*deli != '\0') && (*deli != ','); deli++)
- /* NOTHING */;
+ ret = __sysmmu_setup(dev, data);
+ if (!ret) {
+ data->sysmmu = dev;
+ rwlock_init(&data->lock);
+ INIT_LIST_HEAD(&data->node);
- 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");
- }
-
- if (data->clk[0] && deli) {
- *deli = ',';
- data->clk[1] = clk_get(dev, deli + 1);
- if (IS_ERR(data->clk[1]))
- data->clk[1] = NULL;
- }
-
- data->dbgname = platdata->dbgname;
+ __set_fault_handler(data, &default_fault_handler);
+ dev_dbg(dev, "Initialized\n");
}
- 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);
-
- 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 = {
+/*
+ * Descriptions of Device Tree node for System MMU
+ *
+ * A System MMU should be described by a single tree node.
+ *
+ * A System MMU node should have the following properties:
+ * - reg: tuples of the base address and the size of the IO region of System MMU
+ * - compatible: it must be "samsung,exynos-sysmmu".
+ * - interrupt-parent = specify if the interrupt of System MMU is generated by
+ * interrupt combiner or interrupt controller.
+ * - interrupts: tuples of interrupt numbers. a tuple has 2 elements if
+ * @interrupt-parent is '<&combiner>', 3 elements otherwise.
+ *
+ * 'mmuname', 'reg' and 'interrupts' properties can be an array if the System
+ * MMU driver controls several number of System MMUs at the same time. Note that
+ * the number of elements in those three properties must be the same.
+ *
+ * The following properties are optional:
+ * - mmuname: name of the System MMU for debugging purpose
+ * - mmu-master: reference to the node of the master device.
+ * - mmu-master-compat: 'compatible' proberty of the node of the master device
+ * of System MMU. This is ignored if @mmu-master is currectly specified.
+ * - mmu-master-no: instance number of the master device of System MMU. This is
+ * ignored if @mmu-master is correctly specified. This is '0' by default.
+ */
+#ifdef CONFIG_OF
+static struct of_device_id sysmmu_of_match[] __initconst = {
+ { .compatible = "samsung,exynos-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),
}
};
--
1.8.0
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