USB: host: Introduce flag to enable use of 64-bit dma_mask for ehci-platform

ehci-octeon driver used a 64-bit dma_mask. With removal of ehci-octeon
and usage of ehci-platform ehci dma_mask is now limited to 32 bits
(coerced in ehci_platform_probe).

Provide a flag in ehci platform data to allow use of 64 bits for
dma_mask.

Cc: David Daney <david.daney@cavium.com>
Cc: Alex Smith <alex.smith@imgtec.com>
Signed-off-by: Andreas Herrmann <andreas.herrmann@caviumnetworks.com>
Tested-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

3 files changed, 4 insertions, 4 deletions

diff --git a/arch/mips/cavium-octeon/octeon-platform.c b/arch/mips/cavium-octeon/octeon-platform.c
index eea60b6c927b..12410a2788d8 100644
--- a/arch/mips/cavium-octeon/octeon-platform.c
+++ b/arch/mips/cavium-octeon/octeon-platform.c
@@ -310,6 +310,7 @@ static struct usb_ehci_pdata octeon_ehci_pdata = {
 #ifdef __BIG_ENDIAN
         .big_endian_mmio        = 1,
 #endif
+        .dma_mask_64    = 1,
         .power_on       = octeon_ehci_power_on,
         .power_off      = octeon_ehci_power_off,
 };
@@ -331,8 +332,6 @@ static void __init octeon_ehci_hw_start(struct device *dev)
         octeon2_usb_clocks_stop();
 }
 
-static u64 octeon_ehci_dma_mask = DMA_BIT_MASK(64);
-
 static int __init octeon_ehci_device_init(void)
 {
         struct platform_device *pd;
@@ -347,7 +346,6 @@ static int __init octeon_ehci_device_init(void)
         if (!pd)
                 return 0;
 
-        pd->dev.dma_mask = &octeon_ehci_dma_mask;
         pd->dev.platform_data = &octeon_ehci_pdata;
         octeon_ehci_hw_start(&pd->dev);
 
diff --git a/drivers/usb/host/ehci-platform.c b/drivers/usb/host/ehci-platform.c
index 28aae64a8bee..63f2622926c4 100644
--- a/drivers/usb/host/ehci-platform.c
+++ b/drivers/usb/host/ehci-platform.c
@@ -155,7 +155,8 @@ static int ehci_platform_probe(struct platform_device *dev)
         if (!pdata)
                 pdata = &ehci_platform_defaults;
 
-        err = dma_coerce_mask_and_coherent(&dev->dev, DMA_BIT_MASK(32));
+        err = dma_coerce_mask_and_coherent(&dev->dev,
+                pdata->dma_mask_64 ? DMA_BIT_MASK(64) : DMA_BIT_MASK(32));
         if (err)
                 return err;
 
diff --git a/include/linux/usb/ehci_pdriver.h b/include/linux/usb/ehci_pdriver.h
index 6287b398abd9..db0431b39a63 100644
--- a/include/linux/usb/ehci_pdriver.h
+++ b/include/linux/usb/ehci_pdriver.h
@@ -48,6 +48,7 @@ struct usb_ehci_pdata {
         unsigned        big_endian_mmio:1;
         unsigned        no_io_watchdog:1;
         unsigned        reset_on_resume:1;
+        unsigned        dma_mask_64:1;
 
         /* Turn on all power and clocks */
         int (*power_on)(struct platform_device *pdev);