Add a macro containing all of the code needed to load and transfer control to BL31 ATF blob on i.MX8M. Signed-off-by: Andrey Smirnov <andrew.smirnov@xxxxxxxxx> --- arch/arm/mach-imx/include/mach/atf.h | 63 ++++++++++++++++++++++++++++ 1 file changed, 63 insertions(+) create mode 100644 arch/arm/mach-imx/include/mach/atf.h diff --git a/arch/arm/mach-imx/include/mach/atf.h b/arch/arm/mach-imx/include/mach/atf.h new file mode 100644 index 000000000..0b5018459 --- /dev/null +++ b/arch/arm/mach-imx/include/mach/atf.h @@ -0,0 +1,63 @@ +#ifndef __IMX_ATF_H__ +#define __IMX_ATF_H__ + +#include <asm/system.h> + +#define MX8MQ_ATF_BL31_SIZE_LIMIT SZ_64K +#define MX8MQ_ATF_BL31_BASE_ADDR 0x00910000 +#define MX8MQ_ATF_BL33_BASE_ADDR 0x40200000 + +/** + * imx8mq_atf_load_bl31 - Load ATF BL31 blob and transfer contol to it + * + * @name: Name of the BL31 blob + * + * This macro: + + * 1. Copies built-in BL31 blob to an address i.MX8M's BL31 + * expects to be placed + * + * 2. Sets up temporary stack pointer for EL2, which is execution + * level that BL31 will drop us off at after it completes its + * initialization routine + * + * 3. Transfers control to BL31 + * + * NOTE: This has to be a macro in order delay the expansion of + * get_builtin_firmware(), otherwise it'll incorrectly interpret + * "name" literally + * + * NOTE: This function will do nothing if executed at any other EL + * than EL3. This is done intentionally to support single entry point + * initialization (see i.MX8M EVK for an example) + * + * NOTE: This function expects NXP's implementation of ATF that can be + * found at: + * https://source.codeaurora.org/external/imx/imx-atf + * + * any other implementation may or may not work + * + */ +#define imx8mq_atf_load_bl31(name) \ + do { \ + void __noreturn (*bl31)(void) = \ + (void *)MX8MQ_ATF_BL31_BASE_ADDR; \ + size_t bl31_size; \ + const u8 *fw; \ + \ + if (current_el() != 3) \ + break; \ + \ + get_builtin_firmware(name, &fw, &bl31_size); \ + if (WARN_ON(bl31_size > MX8MQ_ATF_BL31_SIZE_LIMIT)) \ + break; \ + \ + memcpy(bl31, fw, bl31_size); \ + asm volatile("msr sp_el2, %0" : : \ + "r" (MX8MQ_ATF_BL33_BASE_ADDR - 16) : \ + "cc"); \ + \ + bl31(); \ + } while (0) + +#endif \ No newline at end of file -- 2.17.1 _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox
