[PATCH 4/6] ARM: Rockchip: save pointer to scratch memory in global variable

[Ahmad Fatoum <a.fatoum@pengutronix.de>]

This makes it easier to reference the scratch area in PBL without having
to compute the end of memory every time.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
 arch/arm/mach-rockchip/atf.c    | 22 ++++++++++++++--------
 include/mach/rockchip/bootrom.h | 13 +++++++------
 2 files changed, 21 insertions(+), 14 deletions(-)

diff --git a/arch/arm/mach-rockchip/atf.c b/arch/arm/mach-rockchip/atf.c
index 4c16ec3bc66a..2649b80af9e2 100644
--- a/arch/arm/mach-rockchip/atf.c
+++ b/arch/arm/mach-rockchip/atf.c
@@ -12,6 +12,8 @@
 #include <mach/rockchip/rk3568-regs.h>
 #include <mach/rockchip/rk3588-regs.h>
 
+struct rockchip_scratch_space *rk_scratch;
+
 static unsigned long load_elf64_image_phdr(const void *elf)
 {
 	const Elf64_Ehdr *ehdr; /* Elf header structure pointer */
@@ -78,14 +80,16 @@ void rk3568_atf_load_bl31(void *fdt)
 
 void __noreturn rk3568_barebox_entry(void *fdt)
 {
-	unsigned long membase, memsize;
+	unsigned long membase, endmem;
 
 	membase = RK3568_DRAM_BOTTOM;
-	memsize = rk3568_ram0_size() - RK3568_DRAM_BOTTOM;
+	endmem = rk3568_ram0_size();
+
+	rk_scratch = (void *)arm_mem_scratch(endmem);
 
 	if (current_el() == 3) {
 		rk3568_lowlevel_init();
-		rockchip_store_bootrom_iram(membase, memsize, IOMEM(RK3568_IRAM_BASE));
+		rockchip_store_bootrom_iram(IOMEM(RK3568_IRAM_BASE));
 
 		/*
 		 * The downstream TF-A doesn't cope with our device tree when
@@ -102,7 +106,7 @@ void __noreturn rk3568_barebox_entry(void *fdt)
 		/* not reached when CONFIG_ARCH_ROCKCHIP_ATF */
 	}
 
-	barebox_arm_entry(membase, memsize, fdt);
+	barebox_arm_entry(membase, endmem - membase, fdt);
 }
 
 void rk3588_atf_load_bl31(void *fdt)
@@ -112,14 +116,16 @@ void rk3588_atf_load_bl31(void *fdt)
 
 void __noreturn rk3588_barebox_entry(void *fdt)
 {
-       unsigned long membase, memsize;
+       unsigned long membase, endmem;
 
        membase = RK3588_DRAM_BOTTOM;
-       memsize = rk3588_ram0_size() - RK3588_DRAM_BOTTOM;
+       endmem = rk3588_ram0_size();
+
+       rk_scratch = (void *)arm_mem_scratch(endmem);
 
        if (current_el() == 3) {
                rk3588_lowlevel_init();
-               rockchip_store_bootrom_iram(membase, memsize, IOMEM(RK3588_IRAM_BASE));
+               rockchip_store_bootrom_iram(IOMEM(RK3588_IRAM_BASE));
 
                /*
                 * The downstream TF-A doesn't cope with our device tree when
@@ -136,5 +142,5 @@ void __noreturn rk3588_barebox_entry(void *fdt)
                /* not reached when CONFIG_ARCH_ROCKCHIP_ATF */
        }
 
-       barebox_arm_entry(membase, memsize, fdt);
+       barebox_arm_entry(membase, endmem - membase, fdt);
 }
diff --git a/include/mach/rockchip/bootrom.h b/include/mach/rockchip/bootrom.h
index 5b999fc6068a..06450829b99a 100644
--- a/include/mach/rockchip/bootrom.h
+++ b/include/mach/rockchip/bootrom.h
@@ -5,23 +5,24 @@
 
 #include <linux/compiler.h>
 #include <linux/string.h>
+#include <pbl.h>
 #include <asm/barebox-arm.h>
 
 struct rockchip_scratch_space {
 	u32 irom[16];
 };
 
-static inline void rockchip_store_bootrom_iram(ulong membase,
-                                               ulong memsize,
-                                               const void *iram)
+extern struct rockchip_scratch_space *rk_scratch;
+
+static inline void rockchip_store_bootrom_iram(const void *iram)
 {
-	void *dst = (void *)arm_mem_scratch(membase + memsize);
-	memcpy(dst, iram, sizeof(struct rockchip_scratch_space));
+	if (rk_scratch)
+		memcpy(rk_scratch, iram, sizeof(struct rockchip_scratch_space));
 }
 
 static inline const struct rockchip_scratch_space *rockchip_scratch_space(void)
 {
-	return arm_mem_scratch_get();
+	return IN_PBL ? rk_scratch : arm_mem_scratch_get();
 }
 
 void rockchip_parse_bootrom_iram(const void *iram);
-- 
2.39.5