FWU: STM32MP1: Add support to read boot index from backup register

The FWU Multi Bank Update feature allows the platform to boot the
firmware images from one of the partitions(banks). The first stage
bootloader(fsbl) passes the value of the boot index, i.e. the bank
from which the firmware images were booted from to U-Boot. On the
STM32MP157C-DK2 board, this value is passed through one of the SoC's
backup register. Add a function to read the boot index value from the
backup register.

Signed-off-by: Sughosh Ganu <sughosh.ganu@linaro.org>
Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Acked-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Acked-by: Etienne Carriere <etienne.carriere@linaro.org>

diff --git a/arch/arm/mach-stm32mp/include/mach/stm32.h b/arch/arm/mach-stm32mp/include/mach/stm32.h
index c70375a..c85ae6a 100644 (file)
--- a/arch/arm/mach-stm32mp/include/mach/stm32.h
+++ b/arch/arm/mach-stm32mp/include/mach/stm32.h
@@ -112,11 +112,16 @@ enum boot_device {
 #ifdef CONFIG_STM32MP15x
 #define TAMP_BACKUP_MAGIC_NUMBER       TAMP_BACKUP_REGISTER(4)
 #define TAMP_BACKUP_BRANCH_ADDRESS     TAMP_BACKUP_REGISTER(5)
+#define TAMP_FWU_BOOT_INFO_REG         TAMP_BACKUP_REGISTER(10)
 #define TAMP_COPRO_RSC_TBL_ADDRESS     TAMP_BACKUP_REGISTER(17)
 #define TAMP_COPRO_STATE               TAMP_BACKUP_REGISTER(18)
 #define TAMP_BOOT_CONTEXT              TAMP_BACKUP_REGISTER(20)
 #define TAMP_BOOTCOUNT                 TAMP_BACKUP_REGISTER(21)
 
+#define TAMP_FWU_BOOT_IDX_MASK         GENMASK(3, 0)
+
+#define TAMP_FWU_BOOT_IDX_OFFSET       0
+
 #define TAMP_COPRO_STATE_OFF           0
 #define TAMP_COPRO_STATE_INIT          1
 #define TAMP_COPRO_STATE_CRUN          2

diff --git a/board/st/stm32mp1/stm32mp1.c b/board/st/stm32mp1/stm32mp1.c
index 98e96d9..47b3d1b 100644 (file)
--- a/board/st/stm32mp1/stm32mp1.c
+++ b/board/st/stm32mp1/stm32mp1.c
@@ -957,3 +957,24 @@ static void board_copro_image_process(ulong fw_image, size_t fw_size)
 }
 
 U_BOOT_FIT_LOADABLE_HANDLER(IH_TYPE_COPRO, board_copro_image_process);
+
+#if defined(CONFIG_FWU_MULTI_BANK_UPDATE)
+
+#include <fwu.h>
+
+/**
+ * fwu_plat_get_bootidx() - Get the value of the boot index
+ * @boot_idx: Boot index value
+ *
+ * Get the value of the bank(partition) from which the platform
+ * has booted. This value is passed to U-Boot from the earlier
+ * stage bootloader which loads and boots all the relevant
+ * firmware images
+ *
+ */
+void fwu_plat_get_bootidx(uint *boot_idx)
+{
+       *boot_idx = (readl(TAMP_FWU_BOOT_INFO_REG) >>
+                   TAMP_FWU_BOOT_IDX_OFFSET) & TAMP_FWU_BOOT_IDX_MASK;
+}
+#endif /* CONFIG_FWU_MULTI_BANK_UPDATE */

diff --git a/include/fwu.h b/include/fwu.h
index 5391af9..73628c5 100644 (file)
--- a/include/fwu.h
+++ b/include/fwu.h
@@ -341,4 +341,16 @@ int fwu_plat_get_alt_num(struct udevice *dev, efi_guid_t *image_guid,
  *
  */
 int fwu_plat_get_update_index(uint *update_idx);
+
+/**
+ * fwu_plat_get_bootidx() - Get the value of the boot index
+ * @boot_idx: Boot index value
+ *
+ * Get the value of the bank(partition) from which the platform
+ * has booted. This value is passed to U-Boot from the earlier
+ * stage bootloader which loads and boots all the relevant
+ * firmware images
+ *
+ */
+void fwu_plat_get_bootidx(uint *boot_idx);
 #endif /* _FWU_H_ */