During the boot a copy of DM-Firmware is done in a reserved memory
area before it starts.
When resuming, R5 SPL uses this copy of DM-Firmware instead of the fit
image.
TF-A which saved itself in this same memory area, is restored in
SRAM by R5 SPL.
Based on the work of Gregory CLEMENT <gregory.clem...@bootlin.com>
Signed-off-by: Thomas Richard <thomas.rich...@bootlin.com>
Signed-off-by: Gregory CLEMENT <gregory.clem...@bootlin.com>
---
arch/arm/mach-k3/common.c | 37 ++++++++++++++++++++++-
arch/arm/mach-k3/include/mach/j721e_spl.h | 29 ++++++++++++++++++
arch/arm/mach-k3/sysfw-loader.c | 9 ++++--
3 files changed, 71 insertions(+), 4 deletions(-)
diff --git a/arch/arm/mach-k3/common.c b/arch/arm/mach-k3/common.c
index a35110429b..8caeb5da3b 100644
--- a/arch/arm/mach-k3/common.c
+++ b/arch/arm/mach-k3/common.c
@@ -26,6 +26,7 @@
#include <env.h>
#include <elf.h>
#include <soc.h>
+#include <hang.h>
#if IS_ENABLED(CONFIG_SYS_K3_SPL_ATF)
enum {
@@ -221,6 +222,11 @@ void release_resources_for_core_shutdown(void)
}
}
+__weak int board_is_resuming(void)
+{
+ return 0;
+}
+
void __noreturn jump_to_image_no_args(struct spl_image_info *spl_image)
{
typedef void __noreturn (*image_entry_noargs_t)(void);
@@ -235,6 +241,25 @@ void __noreturn jump_to_image_no_args(struct
spl_image_info *spl_image)
if (ret)
panic("rproc failed to be initialized (%d)\n", ret);
+ if (board_is_resuming()) {
+#if IS_ENABLED(CONFIG_SOC_K3_J721E)
+ if (!valid_elf_image(LPM_DM_SAVE))
+ panic("%s: DM-Firmware image is not valid, it cannot be
loaded\n",
+ __func__);
+
+ loadaddr = load_elf_image_phdr(LPM_DM_SAVE);
+
+ memcpy((void *)BL31_START, (void *)LPM_BL31_SAVE, BL31_SIZE);
+
+ ret = rproc_load(1, *(ulong *)(LPM_BL31_SAVE + BL31_SIZE),
BL31_SIZE);
+ if (ret)
+ panic("%s: ATF failed to load on rproc (%d)\n",
__func__, ret);
+
+ debug("%s: jumping to address %x\n", __func__, loadaddr);
+ goto start_arm64;
+#endif
+ }
+
init_env();
if (!fit_image_info[IMAGE_ID_DM_FW].image_start) {
@@ -289,8 +314,18 @@ void __noreturn jump_to_image_no_args(struct
spl_image_info *spl_image)
loadaddr = load_elf_image_phdr(loadaddr);
} else {
loadaddr = fit_image_info[IMAGE_ID_DM_FW].image_start;
- if (valid_elf_image(loadaddr))
+ if (valid_elf_image(loadaddr)) {
loadaddr = load_elf_image_phdr(loadaddr);
+#if IS_ENABLED(CONFIG_SOC_K3_J721E)
+ if (fit_image_info[IMAGE_ID_DM_FW].image_len >
(BUFFER_ADDR - LPM_DM_SAVE))
+ log_warning("%s\n: Not enough space to save
DM-Firmware",
+ __func__);
+ else
+ memcpy((void *)LPM_DM_SAVE,
+ (void
*)fit_image_info[IMAGE_ID_DM_FW].image_start,
+
fit_image_info[IMAGE_ID_DM_FW].image_len);
+#endif
+ }
}
debug("%s: jumping to address %x\n", __func__, loadaddr);
diff --git a/arch/arm/mach-k3/include/mach/j721e_spl.h
b/arch/arm/mach-k3/include/mach/j721e_spl.h
index e8947917a6..7f63c281e9 100644
--- a/arch/arm/mach-k3/include/mach/j721e_spl.h
+++ b/arch/arm/mach-k3/include/mach/j721e_spl.h
@@ -42,4 +42,33 @@
#define K3_PRIMARY_BOOTMODE 0x0
#define K3_BACKUP_BOOTMODE 0x1
+/* Starting buffer address is 1MB before the stack address in DDR */
+#define BUFFER_ADDR (CONFIG_SPL_STACK_R_ADDR - SZ_1M)
+
+/* BL31 TF-A is in the SRAM */
+#define BL31_START 0x70000000
+
+/* This is actually the whole size of the SRAM */
+#define BL31_SIZE 0x20000
+
+/* This address belongs to a reserved memory region for the point of view of
+ * Linux, U-boot SPL must use the same address to restore TF-A and resume
+ * entry point address
+ */
+#define LPM_SAVE 0xA5000000
+#define LPM_BL31_SAVE LPM_SAVE
+#define LPM_DM_SAVE LPM_BL31_SAVE + BL31_SIZE + __SIZEOF_POINTER__
+
+/* Check if the copy of TF-A and DM-Firmware in DRAM does not overlap an
+ * over memory section.
+ * The resume address of TF-A is also saved in DRAM.
+ * At build time we don't know the DM-Firmware size, so we keep 512k to
+ * save it.
+ */
+#if defined(CONFIG_SPL_BUILD) && defined(CONFIG_TARGET_J7200_R5_EVM)
+#if ((LPM_DM_SAVE + SZ_512K) > BUFFER_ADDR)
+#error Not enough space to save DM-Firmware, TF-A and context for S2R
+#endif
+#endif
+
#endif
diff --git a/arch/arm/mach-k3/sysfw-loader.c b/arch/arm/mach-k3/sysfw-loader.c
index 9be2d9eaea..e6d452e590 100644
--- a/arch/arm/mach-k3/sysfw-loader.c
+++ b/arch/arm/mach-k3/sysfw-loader.c
@@ -84,13 +84,16 @@ static bool sysfw_loaded;
static void *sysfw_load_address;
/*
- * Populate SPL hook to override the default load address used by the SPL
- * loader function with a custom address for SYSFW loading.
+ * Populate SPL hook to override the default load address used by the
+ * SPL loader function with a custom address for SYSFW loading. In
+ * other case use also a custom address located in a reserved memory
+ * region. It ensures that Linux memory won't be corrupted by SPL during
+ * suspend to ram.
*/
struct legacy_img_hdr *spl_get_load_buffer(ssize_t offset, size_t size)
{
if (sysfw_loaded)
- return (struct legacy_img_hdr *)(CONFIG_TEXT_BASE + offset);
+ return (struct legacy_img_hdr *)(BUFFER_ADDR + offset);
else if (sysfw_load_address)
return sysfw_load_address;
else
--
2.39.2
