xilinx: versal: add firmware access to PMC multi Boot mode register
Added extended support for retrieving the PMC muti boot mode
register via the firmware interface, which is preferred when
U-Boot runs in EL2 and cannot directly access PMC registers
via raw reads. Ideally, all secure registers should be accessed
via xilinx_pm_request(). Introduced the secure
zynqmp_pm_get_pmc_multi_boot_reg() call, which uses
xilinx_pm_request() to read the PMC multi boot mode register.
BootROM increments the MultiBoot register (PMC_MULTI_BOOT) read
address offset by 32 KB and retries. For SD and eMMC boot modes,
it can search up to 8191 FAT files for the identification string.
A 13-bit mask (0x1FFF) is applied to PMC_MULTI_BOOT_MASK to obtain
the correct values in BootROM.
Signed-off-by: Prasad Kummari <prasad.kummari@amd.com>
Link: https://lore.kernel.org/r/20250305134845.3182193-1-prasad.kummari@amd.com
Signed-off-by: Michal Simek <michal.simek@amd.com>
diff --git a/arch/arm/mach-versal/include/mach/hardware.h b/arch/arm/mach-versal/include/mach/hardware.h
index 9d1c2f0..b5f80a8 100644
--- a/arch/arm/mach-versal/include/mach/hardware.h
+++ b/arch/arm/mach-versal/include/mach/hardware.h
@@ -87,6 +87,8 @@
#define JTAG_MODE 0x00000000
#define BOOT_MODE_USE_ALT 0x100
#define BOOT_MODE_ALT_SHIFT 12
+#define PMC_MULTI_BOOT_REG 0xF1110004
+#define PMC_MULTI_BOOT_MASK 0x1FFF
#define FLASH_RESET_GPIO 0xc
#define WPROT_CRP 0xF126001C