cbmem_top_chipset: Change the return value to uintptr_t

Get rid of a lot of casts.

Change-Id: I93645ef5dd270905ce421e68e342aff4c331eae6
Signed-off-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/69078
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jakub Czapiga <jacz@semihalf.com>

src/soc/nvidia/tegra124/cbmem.c

@@ -1,10 +1,11 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
 #include <cbmem.h>
+#include <commonlib/bsd/helpers.h>
 #include <soc/display.h>
 #include <soc/sdram.h>
 
-void *cbmem_top_chipset(void)
+uintptr_t cbmem_top_chipset(void)
 {
-	return (void *)((sdram_max_addressable_mb() - FB_SIZE_MB) << 20UL);
+	return (sdram_max_addressable_mb() - FB_SIZE_MB) * MiB;
 }

src/soc/nvidia/tegra210/cbmem.c

@@ -3,7 +3,7 @@
 #include <cbmem.h>
 #include <soc/addressmap.h>
 
-void *cbmem_top_chipset(void)
+uintptr_t cbmem_top_chipset(void)
 {
 	static uintptr_t addr;
 
@@ -19,5 +19,5 @@ void *cbmem_top_chipset(void)
 			addr = end_mib << 20;
 	}
 
-	return (void *)addr;
+	return addr;
 }

src/soc/nvidia/tegra210/ramstage.c

@@ -59,7 +59,7 @@ void ramstage_entry(void)
 	/* Ramstage is run on a different core, so passing cbmem_top
 	   via calling arguments is not an option, but it is not a problem
 	   to call cbmem_top_chipset() again here to populate _cbmem_top_ptr. */
-	_cbmem_top_ptr = (uintptr_t)cbmem_top_chipset();
+	_cbmem_top_ptr = cbmem_top_chipset();
 
 	/* Jump to boot state machine in common code. */
 	main();