spl: Enforce framebuffer reservation from end of RAM

Add an API which enforces framebuffer reservation from end of RAM.
This is done so that next stage can directly skip this region before
carrying out further reservations.

Signed-off-by: Devarsh Thakkar <devarsht@ti.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

diff --git a/common/spl/spl.c b/common/spl/spl.c
index 3ce5bfeec8b9a520bcbff8da2dda42ad4d68e0c1..b65c439e7aa9b5818a28a30a4c308141fbce946a 100644 (file)
--- a/common/spl/spl.c
+++ b/common/spl/spl.c
@@ -42,6 +42,7 @@
 #include <fdt_support.h>
 #include <bootcount.h>
 #include <wdt.h>
+#include <video.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 DECLARE_BINMAN_MAGIC_SYM;
@@ -152,6 +153,24 @@ void spl_fixup_fdt(void *fdt_blob)
 #endif
 }
 
+int spl_reserve_video_from_ram_top(void)
+{
+       if (CONFIG_IS_ENABLED(VIDEO)) {
+               ulong addr;
+               int ret;
+
+               addr = gd->ram_top;
+               ret = video_reserve(&addr);
+               if (ret)
+                       return ret;
+               debug("Reserving %luk for video at: %08lx\n",
+                     ((unsigned long)gd->relocaddr - addr) >> 10, addr);
+               gd->relocaddr = addr;
+       }
+
+       return 0;
+}
+
 ulong spl_get_image_pos(void)
 {
        if (!CONFIG_IS_ENABLED(BINMAN_UBOOT_SYMBOLS))

diff --git a/include/spl.h b/include/spl.h
index 095218890147a21cd8a279333d80e2285c79e3dd..043875f10f4fae9dfeea547ac2e10ea4716e24f2 100644 (file)
--- a/include/spl.h
+++ b/include/spl.h
@@ -889,6 +889,16 @@ int spl_usb_load(struct spl_image_info *spl_image,
 
 int spl_ymodem_load_image(struct spl_image_info *spl_image,
                          struct spl_boot_device *bootdev);
+/**
+ * spl_reserve_video_from_ram_top() - Reserve framebuffer memory from end of RAM
+ *
+ * This enforces framebuffer reservation at SPL stage from end of RAM so that
+ * next stage can directly skip this pre-reserved area before carrying out
+ * further reservations. The allocation address is stored in struct video_uc_plat.
+ *
+ * Return: 0 on success, otherwise error code
+ */
+int spl_reserve_video_from_ram_top(void);
 
 /**
  * spl_invoke_atf - boot using an ARM trusted firmware image