[PATCH 6/7] ARM: i.MX93: add scratch space support

[Sascha Hauer]

With upcoming i.MX93 OP-TEE support we'll need to transport the OP-TEE
base address from PBL to barebox proper. Add scratch space support for
i.MX93 to accommodate this.

Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
---
 arch/arm/mach-imx/atf.c     |  2 ++
 arch/arm/mach-imx/esdctl.c  |  2 ++
 arch/arm/mach-imx/scratch.c | 11 +++++++++++
 include/mach/imx/scratch.h  |  1 +
 4 files changed, 16 insertions(+)

diff --git a/arch/arm/mach-imx/atf.c b/arch/arm/mach-imx/atf.c
index d334c902b2..148de8f448 100644
--- a/arch/arm/mach-imx/atf.c
+++ b/arch/arm/mach-imx/atf.c
@@ -384,6 +384,8 @@ void __noreturn imx93_load_and_start_image_via_tfa(void)
 	const void *tfa;
 	size_t tfa_size;
 
+	imx93_init_scratch_space(true);
+
 	/*
 	 * On completion the TF-A will jump to MX93_ATF_BL33_BASE_ADDR
 	 * in EL2. Copy the image there, but replace the PBL part of
diff --git a/arch/arm/mach-imx/esdctl.c b/arch/arm/mach-imx/esdctl.c
index 9c2c4b105d..0dbf0f7242 100644
--- a/arch/arm/mach-imx/esdctl.c
+++ b/arch/arm/mach-imx/esdctl.c
@@ -1047,6 +1047,8 @@ void __noreturn imx7d_barebox_entry(void *boarddata)
 
 void __noreturn imx93_barebox_entry(void *boarddata)
 {
+	imx93_init_scratch_space(false);
+
 	barebox_arm_entry(MX9_DDR_CSD1_BASE_ADDR,
 			  imx9_ddrc_sdram_size(), boarddata);
 }
diff --git a/arch/arm/mach-imx/scratch.c b/arch/arm/mach-imx/scratch.c
index 117b2eadbf..60d15a4f1a 100644
--- a/arch/arm/mach-imx/scratch.c
+++ b/arch/arm/mach-imx/scratch.c
@@ -5,6 +5,7 @@
 #include <linux/err.h>
 #include <linux/printk.h>
 #include <mach/imx/imx8m-regs.h>
+#include <mach/imx/imx9-regs.h>
 #include <mach/imx/esdctl.h>
 #include <mach/imx/scratch.h>
 #include <memory.h>
@@ -30,6 +31,16 @@ void imx8m_init_scratch_space(int ddr_buswidth, bool zero_init)
 		memset(scratch, 0, sizeof(*scratch));
 }
 
+void imx93_init_scratch_space(bool zero_init)
+{
+	ulong endmem = MX9_DDR_CSD1_BASE_ADDR + imx9_ddrc_sdram_size();
+
+	scratch = (void *)arm_mem_scratch(endmem);
+
+	if (zero_init)
+		memset(scratch, 0, sizeof(*scratch));
+}
+
 void imx8m_scratch_save_bootrom_log(const u32 *rom_log)
 {
 	size_t sz = sizeof(scratch->bootrom_log);
diff --git a/include/mach/imx/scratch.h b/include/mach/imx/scratch.h
index b1bb2e446e..6c2cecabcd 100644
--- a/include/mach/imx/scratch.h
+++ b/include/mach/imx/scratch.h
@@ -4,6 +4,7 @@
 #define __MACH_IMX_SCRATCH_H
 
 void imx8m_init_scratch_space(int ddr_buswidth, bool zero_init);
+void imx93_init_scratch_space(bool zero_init);
 
 const u32 *imx8m_scratch_get_bootrom_log(void);
 void imx8m_scratch_save_bootrom_log(const u32 *rom_log);
-- 
2.39.2