Shutdown U-Boot before starting an OS

Some devices, especially the ones doing DMA should be disabled before
giving control to an OS. We take the simple approach here: Just shutdown
the devices in the reverse order they were activated.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

2 files changed, 8 insertions, 1 deletions

diff --git a/include/common.h b/include/common.h
index a224f9a87e..a580e115c0 100644
--- a/include/common.h
+++ b/include/common.h
@@ -131,6 +131,7 @@ int parse_area_spec(const char *str, ulong *start, ulong *size);
 unsigned long strtoul_suffix(const char *str, char **endp, int base);
 
 void start_uboot(void);
+void shutdown_uboot(void);
 
 int arch_execute(unsigned long address, int argc, char *argv[]);
 
diff --git a/include/driver.h b/include/driver.h
index 45097a3c05..fdb40eb8f0 100644
--- a/include/driver.h
+++ b/include/driver.h
@@ -103,6 +103,7 @@ struct device_d {
 	struct list_head list;     /* The list of all devices */
 	struct list_head children; /* our children            */
 	struct list_head sibling;
+	struct list_head active;   /* The list of all devices which have a driver */
 
 	struct device_d *parent;   /* our parent, NULL if not present */
 
@@ -128,7 +129,7 @@ struct driver_d {
 	int     (*probe) (struct device_d *);
 
 	/*! Called if an instance of a device is gone. */
-	int     (*remove)(struct device_d *);
+	void     (*remove)(struct device_d *);
 
 	/*! Called in response of reading from this device. Required */
 	ssize_t (*read)  (struct device_d*, void* buf, size_t count, ulong offset, ulong flags);
@@ -245,6 +246,11 @@ int mem_memmap(struct device_d *dev, void **map, int flags);
 /* Use this if you have nothing to do in your drivers probe function */
 int dummy_probe(struct device_d *);
 
+/* Iterate over all activated devices (i.e. the ones with drivers and shut
+ * them down.
+ */
+void devices_shutdown(void);
+
 int generic_memmap_ro(struct device_d *dev, void **map, int flags);
 int generic_memmap_rw(struct device_d *dev, void **map, int flags);