[PATCH] sunxi: Load sun8i secure monitor to SRAM A2

[Samuel Holland]

Most sun6i-derived SoCs contain SRAM A2, a secure SRAM area for ARISC
SCP firmware. H3 has a smaller SRAM than other SoCs (A31/A33/A23/A83T).

On sun8i SoCs which do not have SRAM B, we can use part of this SRAM for
the secure monitor. Follow the design of 64-bit SoCs and use the first
part for the monitor, and the last 16 KiB for the SCP firmware. With
this change, the monitor no longer needs to reserve a region in DRAM.

Signed-off-by: Samuel Holland <samuel at sholland.org>
---
 arch/arm/include/asm/arch-sunxi/cpu_sun4i.h | 11 +++++++++++
 include/configs/sun8i.h                     |  7 +++++++
 2 files changed, 18 insertions(+)

diff --git a/arch/arm/include/asm/arch-sunxi/cpu_sun4i.h b/arch/arm/include/asm/arch-sunxi/cpu_sun4i.h
index 02ce73954d..d4c795d89c 100644
--- a/arch/arm/include/asm/arch-sunxi/cpu_sun4i.h
+++ b/arch/arm/include/asm/arch-sunxi/cpu_sun4i.h
@@ -11,7 +11,18 @@
 #define SUNXI_SRAM_A1_BASE		0x00000000
 #define SUNXI_SRAM_A1_SIZE		(16 * 1024)	/* 16 kiB */
 
+#if defined(CONFIG_SUNXI_GEN_SUN6I) && \
+    !defined(CONFIG_MACH_SUN8I_R40) && \
+    !defined(CONFIG_MACH_SUN8I_V3S)
+#define SUNXI_SRAM_A2_BASE		0x00040000
+#ifdef CONFIG_MACH_SUN8I_H3
+#define SUNXI_SRAM_A2_SIZE		(48 * 1024)	/* 16+32 kiB */
+#else
+#define SUNXI_SRAM_A2_SIZE		(80 * 1024)	/* 16+64 kiB */
+#endif
+#else
 #define SUNXI_SRAM_A2_BASE		0x00004000	/* 16 kiB */
+#endif
 #define SUNXI_SRAM_A3_BASE		0x00008000	/* 13 kiB */
 #define SUNXI_SRAM_A4_BASE		0x0000b400	/* 3 kiB */
 #define SUNXI_SRAM_D_BASE		0x00010000	/* 4 kiB */
diff --git a/include/configs/sun8i.h b/include/configs/sun8i.h
index 9b4675e4c3..545d27996c 100644
--- a/include/configs/sun8i.h
+++ b/include/configs/sun8i.h
@@ -12,6 +12,13 @@
  * A23 specific configuration
  */
 
+/*
+ * Skip the first 16 KiB of SRAM A2, which is not usable, as only certain bytes
+ * are writable. Reserve the last 17 KiB for the resume shim and SCP firmware.
+ */
+#define CONFIG_ARMV7_SECURE_BASE	(SUNXI_SRAM_A2_BASE + 16 * 1024)
+#define CONFIG_ARMV7_SECURE_MAX_SIZE	(SUNXI_SRAM_A2_SIZE - 33 * 1024)
+
 /*
  * Include common sunxi configuration where most the settings are
  */
-- 
2.26.3