On Fri, 15 Jan 2016, Shannon Zhao wrote:
> From: Shannon Zhao <shannon.zhao@xxxxxxxxxx>
>
> 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@xxxxxxxxxx>
Reviewed-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
> drivers/xen/arm-device.c | 43 +++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 43 insertions(+)
>
> diff --git a/drivers/xen/arm-device.c b/drivers/xen/arm-device.c
> index 7d902ea..9978f8d 100644
> --- a/drivers/xen/arm-device.c
> +++ b/drivers/xen/arm-device.c
> @@ -138,3 +138,46 @@ static int __init register_xen_platform_notifier(void)
> }
>
> 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
> --
> 2.0.4
>
>
>
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> http://lists.xen.org/xen-devel
>
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