Initial commit: OpenHarmony-v4.0-ReleaseOpenHarmony-v4.0-Release

1 files changed, 49 insertions, 0 deletions

diff --git a/arch/mips/sni/eisa.c b/arch/mips/sni/eisa.c
new file mode 100644
index 000000000..483a43d07
--- /dev/null
+++ b/arch/mips/sni/eisa.c
@@ -0,0 +1,49 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Virtual EISA root driver.
+ * Acts as a placeholder if we don't have a proper EISA bridge.
+ *
+ * (C) 2003 Marc Zyngier <maz@wild-wind.fr.eu.org>
+ * modified for SNI usage by Thomas Bogendoerfer
+ */
+
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/eisa.h>
+#include <linux/init.h>
+
+/* The default EISA device parent (virtual root device).
+ * Now use a platform device, since that's the obvious choice. */
+
+static struct platform_device eisa_root_dev = {
+        .name = "eisa",
+        .id   = 0,
+};
+
+static struct eisa_root_device eisa_bus_root = {
+        .dev           = &eisa_root_dev.dev,
+        .bus_base_addr = 0,
+        .res           = &ioport_resource,
+        .slots         = EISA_MAX_SLOTS,
+        .dma_mask      = 0xffffffff,
+        .force_probe   = 1,
+};
+
+int __init sni_eisa_root_init(void)
+{
+        int r;
+
+        r = platform_device_register(&eisa_root_dev);
+        if (!r)
+                return r;
+
+        dev_set_drvdata(&eisa_root_dev.dev, &eisa_bus_root);
+
+        if (eisa_root_register(&eisa_bus_root)) {
+                /* A real bridge may have been registered before
+                 * us. So quietly unregister. */
+                platform_device_unregister(&eisa_root_dev);
+                return -1;
+        }
+        return 0;
+}