blkmap: add an attribute to preserve the mem mapping
Some blkmap memory mapped devices might have to be relevant even
after U-Boot passes control to the next image as part of the platform
boot. An example of such a mapping would be an OS installer ISO image,
information for which has to be provided to the OS kernel. Use the
'preserve' attribute for such mappings. The code for adding a pmem
node to the device-tree then checks if this attribute is set, and adds
a node only for mappings which have this attribute.
Signed-off-by: Sughosh Ganu <sughosh.ganu@linaro.org>
Reviewed-by: Tobias Waldekranz <tobias@waldekranz.com>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
diff --git a/drivers/block/blkmap.c b/drivers/block/blkmap.c
index 08f6857..1b161bd 100644
--- a/drivers/block/blkmap.c
+++ b/drivers/block/blkmap.c
@@ -33,6 +33,14 @@
#define BLKMAP_SLICE_MEM BIT(1)
/**
+ * define BLKMAP_SLICE_PRESERVE - Preserved blkmap slice
+ *
+ * This blkmap slice is intended to be preserved, and it's
+ * information passed on to a later stage, like OS.
+ */
+#define BLKMAP_SLICE_PRESERVE BIT(2)
+
+/**
* struct blkmap_slice - Region mapped to a blkmap
*
* Common data for a region mapped to a blkmap, specialized by each
@@ -253,7 +261,7 @@
}
int __blkmap_map_mem(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt,
- void *addr, bool remapped)
+ void *addr, bool remapped, bool preserve)
{
struct blkmap *bm = dev_get_plat(dev);
struct blkmap_mem *bmm;
@@ -278,6 +286,9 @@
.remapped = remapped,
};
+ if (preserve)
+ bmm->slice.attr |= BLKMAP_SLICE_PRESERVE;
+
err = blkmap_slice_add(bm, &bmm->slice);
if (err)
free(bmm);
@@ -288,11 +299,11 @@
int blkmap_map_mem(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt,
void *addr)
{
- return __blkmap_map_mem(dev, blknr, blkcnt, addr, false);
+ return __blkmap_map_mem(dev, blknr, blkcnt, addr, false, false);
}
int blkmap_map_pmem(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt,
- phys_addr_t paddr)
+ phys_addr_t paddr, bool preserve)
{
struct blkmap *bm = dev_get_plat(dev);
struct blk_desc *bd = dev_get_uclass_plat(bm->blk);
@@ -303,7 +314,7 @@
if (!addr)
return -ENOMEM;
- err = __blkmap_map_mem(dev, blknr, blkcnt, addr, true);
+ err = __blkmap_map_mem(dev, blknr, blkcnt, addr, true, preserve);
if (err)
unmap_sysmem(addr);