| /* | |
| * Copyright (c) 2021 Raspberry Pi (Trading) Ltd. | |
| * | |
| * SPDX-License-Identifier: BSD-3-Clause | |
| */ | |
| #ifndef _BOOT2_HELPER_WAIT_SSI_READY | |
| #define _BOOT2_HELPER_WAIT_SSI_READY | |
| wait_ssi_ready: | |
| push {r0, r1, lr} | |
| // Command is complete when there is nothing left to send | |
| // (TX FIFO empty) and SSI is no longer busy (CSn deasserted) | |
| 1: | |
| ldr r1, [r3, #SSI_SR_OFFSET] | |
| movs r0, #SSI_SR_TFE_BITS | |
| tst r1, r0 | |
| beq 1b | |
| movs r0, #SSI_SR_BUSY_BITS | |
| tst r1, r0 | |
| bne 1b | |
| pop {r0, r1, pc} | |
| #endif |