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ARM: ixp4xx: Make dma_set_coherent_mask common, correct implementation

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Non-PCI devices can use the entire 32-bit range, PCI dittos are
limited to the first 64MiB.

Also actually setup coherent_dma_mask.

The patch has been verified on a board with 128MiB memory, one
ipx4xx_eth device and a e100 PCI device.

Signed-off-by: Simon Kagstrom <simon.kagstrom@netinsight.net>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Simon Kågström 2014-03-17 14:42:35 +01:00 committed by Arnd Bergmann
parent 64cf9d07ef
commit bfdad565ae
2 changed files with 12 additions and 9 deletions
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9
arch/arm/mach-ixp4xx/common-pci.c
View file

@ -481,14 +481,5 @@ int ixp4xx_setup(int nr, struct pci_sys_data *sys)
return 1;
}
int dma_set_coherent_mask(struct device *dev, u64 mask)
{
if (mask >= SZ_64M - 1)
return 0;
return -EIO;
}
EXPORT_SYMBOL(ixp4xx_pci_read);
EXPORT_SYMBOL(ixp4xx_pci_write);
EXPORT_SYMBOL(dma_set_coherent_mask);

12
arch/arm/mach-ixp4xx/common.c
View file

@ -31,6 +31,7 @@
#include <linux/gpio.h>
#include <linux/cpu.h>
#include <linux/sched_clock.h>
#include <linux/pci.h>
#include <mach/udc.h>
#include <mach/hardware.h>
@ -578,6 +579,17 @@ void ixp4xx_restart(enum reboot_mode mode, const char *cmd)
}
}
int dma_set_coherent_mask(struct device *dev, u64 mask)
{
if (dev_is_pci(dev) && mask >= SZ_64M)
return -EIO;
dev->coherent_dma_mask = mask;
return 0;
}
EXPORT_SYMBOL(dma_set_coherent_mask);
#ifdef CONFIG_IXP4XX_INDIRECT_PCI
/*
* In the case of using indirect PCI, we simply return the actual PCI