[PATCH v2 1/6] arm: mach-k3: common: Reserve video memory from end of the RAM

[Devarsh Thakkar]

Add function spl_reserve_video which is a wrapper
around video_reserve to setup video memory and update
the relocation address pointer.

Setup video memory before page table reservation so that
framebuffer memory gets reserved from the end of RAM.

This is as per the new policy being discussed for passing
blobs where each of the reserved areas for bloblists
to be passed need to be reserved at the end of RAM.

This is done to enable the next stage to directly skip
the pre-reserved area from previous stage right from the end of RAM
without having to make any gaps/holes to accommodate those
regions which was the case before as previous stage
reserved region not from the end of RAM.

Suggested-by: Simon Glass <sjg at chromium.org>
Signed-off-by: Devarsh Thakkar <devarsht at ti.com>
---
V2:
- Make a generic function "spl_reserve_video" under
  common/spl which can be re-used by other platforms too
  for reserving video memory from spl.

V3:
- Change spl_reserve_video to spl_reserve_video_from_ram_top
  which enforce framebuffer reservation from end of RAM
- Use gd->ram_top instead of local ram_top and update
  gd->reloc_addr after each reservation
- Print error message on framebuffer reservation
---
 arch/arm/mach-k3/common.c | 17 ++++++++++++-----
 common/spl/spl.c          | 27 +++++++++++++++++++++++++++
 include/spl.h             |  6 ++++++
 3 files changed, 45 insertions(+), 5 deletions(-)

diff --git a/arch/arm/mach-k3/common.c b/arch/arm/mach-k3/common.c
index c3006ba387..6590045140 100644
--- a/arch/arm/mach-k3/common.c
+++ b/arch/arm/mach-k3/common.c
@@ -525,19 +525,26 @@ void remove_fwl_configs(struct fwl_data *fwl_data, size_t fwl_data_size)
 void spl_enable_dcache(void)
 {
 #if !(defined(CONFIG_SYS_ICACHE_OFF) && defined(CONFIG_SYS_DCACHE_OFF))
-	phys_addr_t ram_top = CFG_SYS_SDRAM_BASE;
+	gd->ram_top = CFG_SYS_SDRAM_BASE;
+	int ret = 0;
 
 	dram_init();
 
 	/* reserve TLB table */
 	gd->arch.tlb_size = PGTABLE_SIZE;
 
-	ram_top += get_effective_memsize();
+	gd->ram_top += get_effective_memsize();
 	/* keep ram_top in the 32-bit address space */
-	if (ram_top >= 0x100000000)
-		ram_top = (phys_addr_t) 0x100000000;
+	if (gd->ram_top >= 0x100000000)
+		gd->ram_top = (phys_addr_t)0x100000000;
 
-	gd->arch.tlb_addr = ram_top - gd->arch.tlb_size;
+	gd->relocaddr = gd->ram_top;
+
+	ret = spl_reserve_video_from_ram_top();
+	if (ret)
+		pr_err("ERROR: Failed to framebuffer memory in SPL\n");
+
+	gd->arch.tlb_addr = gd->relocaddr - gd->arch.tlb_size;
 	gd->arch.tlb_addr &= ~(0x10000 - 1);
 	debug("TLB table from %08lx to %08lx\n", gd->arch.tlb_addr,
 	      gd->arch.tlb_addr + gd->arch.tlb_size);
diff --git a/common/spl/spl.c b/common/spl/spl.c
index 732d90d39e..452bf303de 100644
--- a/common/spl/spl.c
+++ b/common/spl/spl.c
@@ -41,6 +41,7 @@
 #include <fdt_support.h>
 #include <bootcount.h>
 #include <wdt.h>
+#include <video.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 DECLARE_BINMAN_MAGIC_SYM;
@@ -151,6 +152,32 @@ void spl_fixup_fdt(void *fdt_blob)
 #endif
 }
 
+/*
+ * Reserve video memory for SPL splash screen from
+ * end of RAM
+ *
+ * RETURN
+ * 0 : On success
+ * Non-zero : On failure
+ */
+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 0d49e4a454..39f2a7581d 100644
--- a/include/spl.h
+++ b/include/spl.h
@@ -825,6 +825,12 @@ 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
+ *
+ * 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
-- 
2.34.1