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Message-ID: <1425333548-8802-1-git-send-email-m-karicheri2@ti.com>
Date: Mon, 2 Mar 2015 16:59:07 -0500
From: Murali Karicheri <m-karicheri2@...com>
To: <linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>, <iommu@...ts.linux-foundation.org>,
<devicetree@...r.kernel.org>, <bhelgaas@...gle.com>
CC: Murali Karicheri <m-karicheri2@...com>,
Joerg Roedel <joro@...tes.org>,
Grant Likely <grant.likely@...aro.org>,
Rob Herring <robh+dt@...nel.org>,
Russell King <linux@....linux.org.uk>,
Arnd Bergmann <arnd@...db.de>
Subject: [PATCH - v7] of: Move of_dma_configure() to device.c to help re-use
Move of_dma_configure() to device.c so it can be re-used for PCI devices to
obtain DMA configuration from DT. Also add a second argument so that for
PCI, the DT node of root bus host bridge can be used to obtain the DMA
configuration for the slave PCI device.
Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com> (AMD Seattle)
Signed-off-by: Murali Karicheri <m-karicheri2@...com>
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
Reviewed-by: Catalin Marinas <catalin.marinas@....com>
Acked-by: Will Deacon <will.deacon@....com>
CC: Joerg Roedel <joro@...tes.org>
CC: Grant Likely <grant.likely@...aro.org>
CC: Rob Herring <robh+dt@...nel.org>
CC: Russell King <linux@....linux.org.uk>
CC: Arnd Bergmann <arnd@...db.de>
---
- Based on the existing patch applied to arm-pci/pci/iommu for pci next (Bjorn)
- Fixed the build issue reported on ARCH=x86_64
drivers/of/device.c | 59 +++++++++++++++++++++++++++++++++++++++++++++
drivers/of/platform.c | 58 ++------------------------------------------
include/linux/of_device.h | 2 ++
3 files changed, 63 insertions(+), 56 deletions(-)
diff --git a/drivers/of/device.c b/drivers/of/device.c
index 46d6c75c..31a7875 100644
--- a/drivers/of/device.c
+++ b/drivers/of/device.c
@@ -2,6 +2,9 @@
#include <linux/kernel.h>
#include <linux/of.h>
#include <linux/of_device.h>
+#include <linux/of_address.h>
+#include <linux/of_iommu.h>
+#include <linux/dma-mapping.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
@@ -66,6 +69,62 @@ int of_device_add(struct platform_device *ofdev)
return device_add(&ofdev->dev);
}
+/**
+ * of_dma_configure - Setup DMA configuration
+ * @dev: Device to apply DMA configuration
+ * @np: Pointer to OF node having DMA configuration
+ *
+ * Try to get devices's DMA configuration from DT and update it
+ * accordingly.
+ *
+ * If platform code needs to use its own special DMA configuration, it
+ * can use a platform bus notifier and handle BUS_NOTIFY_ADD_DEVICE events
+ * to fix up DMA configuration.
+ */
+void of_dma_configure(struct device *dev, struct device_node *np)
+{
+ u64 dma_addr, paddr, size;
+ int ret;
+ bool coherent;
+ unsigned long offset;
+ struct iommu_ops *iommu;
+
+ /*
+ * Set default dma-mask to 32 bit. Drivers are expected to setup
+ * the correct supported dma_mask.
+ */
+ dev->coherent_dma_mask = DMA_BIT_MASK(32);
+
+ /*
+ * Set it to coherent_dma_mask by default if the architecture
+ * code has not set it.
+ */
+ if (!dev->dma_mask)
+ dev->dma_mask = &dev->coherent_dma_mask;
+
+ ret = of_dma_get_range(np, &dma_addr, &paddr, &size);
+ if (ret < 0) {
+ dma_addr = offset = 0;
+ size = dev->coherent_dma_mask;
+ } else {
+ offset = PFN_DOWN(paddr - dma_addr);
+ dev_dbg(dev, "dma_pfn_offset(%#08lx)\n", offset);
+ }
+
+ dev->dma_pfn_offset = offset;
+
+ coherent = of_dma_is_coherent(np);
+ dev_dbg(dev, "device is%sdma coherent\n",
+ coherent ? " " : " not ");
+
+ iommu = of_iommu_configure(dev, np);
+ dev_dbg(dev, "device is%sbehind an iommu\n",
+ iommu ? " " : " not ");
+
+ arch_setup_dma_ops(dev, dma_addr, size, iommu, coherent);
+}
+EXPORT_SYMBOL_GPL(of_dma_configure);
+
int of_device_register(struct platform_device *pdev)
{
device_initialize(&pdev->dev);
diff --git a/drivers/of/platform.c b/drivers/of/platform.c
index 667c6f1..a01f57c 100644
--- a/drivers/of/platform.c
+++ b/drivers/of/platform.c
@@ -19,7 +19,6 @@
#include <linux/slab.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
-#include <linux/of_iommu.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
@@ -150,59 +149,6 @@ struct platform_device *of_device_alloc(struct device_node *np,
}
EXPORT_SYMBOL(of_device_alloc);
-/**
- * of_dma_configure - Setup DMA configuration
- * @dev: Device to apply DMA configuration
- *
- * Try to get devices's DMA configuration from DT and update it
- * accordingly.
- *
- * In case if platform code need to use own special DMA configuration,it
- * can use Platform bus notifier and handle BUS_NOTIFY_ADD_DEVICE event
- * to fix up DMA configuration.
- */
-static void of_dma_configure(struct device *dev)
-{
- u64 dma_addr, paddr, size;
- int ret;
- bool coherent;
- unsigned long offset;
- struct iommu_ops *iommu;
-
- /*
- * Set default dma-mask to 32 bit. Drivers are expected to setup
- * the correct supported dma_mask.
- */
- dev->coherent_dma_mask = DMA_BIT_MASK(32);
-
- /*
- * Set it to coherent_dma_mask by default if the architecture
- * code has not set it.
- */
- if (!dev->dma_mask)
- dev->dma_mask = &dev->coherent_dma_mask;
-
- ret = of_dma_get_range(dev->of_node, &dma_addr, &paddr, &size);
- if (ret < 0) {
- dma_addr = offset = 0;
- size = dev->coherent_dma_mask;
- } else {
- offset = PFN_DOWN(paddr - dma_addr);
- dev_dbg(dev, "dma_pfn_offset(%#08lx)\n", offset);
- }
- dev->dma_pfn_offset = offset;
-
- coherent = of_dma_is_coherent(dev->of_node);
- dev_dbg(dev, "device is%sdma coherent\n",
- coherent ? " " : " not ");
-
- iommu = of_iommu_configure(dev, dev->of_node);
- dev_dbg(dev, "device is%sbehind an iommu\n",
- iommu ? " " : " not ");
-
- arch_setup_dma_ops(dev, dma_addr, size, iommu, coherent);
-}
-
static void of_dma_deconfigure(struct device *dev)
{
arch_teardown_dma_ops(dev);
@@ -236,7 +182,7 @@ static struct platform_device *of_platform_device_create_pdata(
dev->dev.bus = &platform_bus_type;
dev->dev.platform_data = platform_data;
- of_dma_configure(&dev->dev);
+ of_dma_configure(&dev->dev, dev->dev.of_node);
if (of_device_add(dev) != 0) {
of_dma_deconfigure(&dev->dev);
@@ -299,7 +245,7 @@ static struct amba_device *of_amba_device_create(struct device_node *node,
dev_set_name(&dev->dev, "%s", bus_id);
else
of_device_make_bus_id(&dev->dev);
- of_dma_configure(&dev->dev);
+ of_dma_configure(&dev->dev, dev->dev.of_node);
/* Allow the HW Peripheral ID to be overridden */
prop = of_get_property(node, "arm,primecell-periphid", NULL);
diff --git a/include/linux/of_device.h b/include/linux/of_device.h
index ef37021..be70cb4 100644
--- a/include/linux/of_device.h
+++ b/include/linux/of_device.h
@@ -53,6 +53,7 @@ static inline struct device_node *of_cpu_device_node_get(int cpu)
return of_node_get(cpu_dev->of_node);
}
+void of_dma_configure(struct device *dev, struct device_node *np);
#else /* CONFIG_OF */
static inline int of_driver_match_device(struct device *dev,
@@ -90,6 +91,7 @@ static inline struct device_node *of_cpu_device_node_get(int cpu)
{
return NULL;
}
+static inline void of_dma_configure(struct device *dev, struct device_node *np) { }
#endif /* CONFIG_OF */
#endif /* _LINUX_OF_DEVICE_H */
--
1.7.9.5
--
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