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Message-ID: <1454641552-12576-8-git-send-email-zhaoshenglong@huawei.com>
Date: Fri, 5 Feb 2016 11:05:42 +0800
From: Shannon Zhao <zhaoshenglong@...wei.com>
To: <linux-arm-kernel@...ts.infradead.org>,
<ard.biesheuvel@...aro.org>, <stefano.stabellini@...rix.com>,
<david.vrabel@...rix.com>
CC: <catalin.marinas@....com>, <will.deacon@....com>,
<mark.rutland@....com>, <julien.grall@...rix.com>,
<xen-devel@...ts.xen.org>, <devicetree@...r.kernel.org>,
<linux-efi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<ian.campbell@...rix.com>, <shannon.zhao@...aro.org>,
<peter.huangpeng@...wei.com>
Subject: [PATCH v4 07/17] Xen: ARM: Add support for mapping AMBA device mmio
From: Shannon Zhao <shannon.zhao@...aro.org>
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@...aro.org>
Reviewed-by: Stefano Stabellini <stefano.stabellini@...citrix.com>
---
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 76e26e5..3854043 100644
--- a/drivers/xen/arm-device.c
+++ b/drivers/xen/arm-device.c
@@ -139,3 +139,46 @@ 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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