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Xen: ARM: Add support for mapping AMBA device mmio 

Add a bus_notifier for AMBA bus device in order to map the device
mmio regions when DOM0 booting with ACPI.

Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Reviewed-by: Julien Grall <julien.grall@arm.com>
Tested-by: Julien Grall <julien.grall@arm.com>
This commit is contained in:
Shannon Zhao 2016-04-07 20:03:24 +08:00 committed by David Vrabel
parent 4ba04bec37
commit 5789afeb0e
1 changed files with 43 additions and 0 deletions
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43
drivers/xen/arm-device.c
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@ -151,3 +151,46 @@ static int __init register_xen_platform_notifier(void)
} }
arch_initcall(register_xen_platform_notifier); arch_initcall(register_xen_platform_notifier);
#ifdef CONFIG_ARM_AMBA
#include <linux/amba/bus.h>
static int xen_amba_notifier(struct notifier_block *nb,
unsigned long action, void *data)
{
struct amba_device *adev = to_amba_device(data);
int r = 0;
switch (action) {
case BUS_NOTIFY_ADD_DEVICE:
r = xen_map_device_mmio(&adev->res, 1);
break;
case BUS_NOTIFY_DEL_DEVICE:
r = xen_unmap_device_mmio(&adev->res, 1);
break;
default:
return NOTIFY_DONE;
}
if (r)
dev_err(&adev->dev, "AMBA: Failed to %s device %s MMIO!\n",
action == BUS_NOTIFY_ADD_DEVICE ? "map" :
(action == BUS_NOTIFY_DEL_DEVICE ? "unmap" : "?"),
adev->dev.init_name);
return NOTIFY_OK;
}
static struct notifier_block amba_device_nb = {
.notifier_call = xen_amba_notifier,
};
static int __init register_xen_amba_notifier(void)
{
if (!xen_initial_domain() || acpi_disabled)
return 0;
return bus_register_notifier(&amba_bustype, &amba_device_nb);
}
arch_initcall(register_xen_amba_notifier);
#endif