ARM: imx: allow specifying a dma mask when creating a platform device

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

2 files changed, 33 insertions, 4 deletions

diff --git a/arch/arm/plat-mxc/devices.c b/arch/arm/plat-mxc/devices.c
index 735776d84956..e9bcefe79a43 100644
--- a/arch/arm/plat-mxc/devices.c
+++ b/arch/arm/plat-mxc/devices.c
@@ -17,6 +17,7 @@
  */
 
 #include <linux/kernel.h>
+#include <linux/slab.h>
 #include <linux/init.h>
 #include <linux/err.h>
 #include <linux/platform_device.h>
@@ -36,9 +37,10 @@ int __init mxc_register_device(struct platform_device *pdev, void *data)
         return ret;
 }
 
-struct platform_device *__init imx_add_platform_device(const char *name, int id,
+struct platform_device *__init imx_add_platform_device_dmamask(
+                const char *name, int id,
                 const struct resource *res, unsigned int num_resources,
-                const void *data, size_t size_data)
+                const void *data, size_t size_data, u64 dmamask)
 {
         int ret = -ENOMEM;
         struct platform_device *pdev;
@@ -47,6 +49,23 @@ struct platform_device *__init imx_add_platform_device(const char *name, int id,
         if (!pdev)
                 goto err;
 
+        if (dmamask) {
+                /*
+                 * This memory isn't freed when the device is put,
+                 * I don't have a nice idea for that though.  Conceptually
+                 * dma_mask in struct device should not be a pointer.
+                 * See http://thread.gmane.org/gmane.linux.kernel.pci/9081
+                 */
+                pdev->dev.dma_mask =
+                        kmalloc(sizeof(*pdev->dev.dma_mask), GFP_KERNEL);
+                if (!pdev->dev.dma_mask)
+                        /* ret is still -ENOMEM; */
+                        goto err;
+
+                *pdev->dev.dma_mask = dmamask;
+                pdev->dev.coherent_dma_mask = dmamask;
+        }
+
         if (res) {
                 ret = platform_device_add_resources(pdev, res, num_resources);
                 if (ret)
diff --git a/arch/arm/plat-mxc/include/mach/devices-common.h b/arch/arm/plat-mxc/include/mach/devices-common.h
index 4eb45fa53ac5..a5e97b8b3b79 100644
--- a/arch/arm/plat-mxc/include/mach/devices-common.h
+++ b/arch/arm/plat-mxc/include/mach/devices-common.h
@@ -10,9 +10,19 @@
 #include <linux/platform_device.h>
 #include <linux/init.h>
 
-struct platform_device *imx_add_platform_device(const char *name, int id,
+struct platform_device *imx_add_platform_device_dmamask(
+                const char *name, int id,
                 const struct resource *res, unsigned int num_resources,
-                const void *data, size_t size_data);
+                const void *data, size_t size_data, u64 dmamask);
+
+static inline struct platform_device *imx_add_platform_device(
+                const char *name, int id,
+                const struct resource *res, unsigned int num_resources,
+                const void *data, size_t size_data)
+{
+        return imx_add_platform_device_dmamask(
+                        name, id, res, num_resources, data, size_data, 0);
+}
 
 #include <linux/fec.h>
 struct imx_fec_data {