1 /*
2  * Copyright (c) 2017-2019, ARM Limited and Contributors. All rights reserved.
3  *
4  * SPDX-License-Identifier: BSD-3-Clause
5  */
6 
7 #include <errno.h>
8 
9 #include <platform_def.h>
10 
11 #include <drivers/st/stm32mp1_clk.h>
12 #include <dt-bindings/clock/stm32mp1-clks.h>
13 #include <lib/mmio.h>
14 
15 #include <stm32mp1_context.h>
16 
17 #define TAMP_BOOT_ITF_BACKUP_REG_ID	U(20)
18 #define TAMP_BOOT_ITF_MASK		U(0x0000FF00)
19 #define TAMP_BOOT_ITF_SHIFT		8
20 
stm32_save_boot_interface(uint32_t interface,uint32_t instance)21 int stm32_save_boot_interface(uint32_t interface, uint32_t instance)
22 {
23 	uint32_t bkpr_itf_idx = tamp_bkpr(TAMP_BOOT_ITF_BACKUP_REG_ID);
24 
25 	stm32mp_clk_enable(RTCAPB);
26 
27 	mmio_clrsetbits_32(bkpr_itf_idx,
28 			   TAMP_BOOT_ITF_MASK,
29 			   ((interface << 4) | (instance & 0xFU)) <<
30 			   TAMP_BOOT_ITF_SHIFT);
31 
32 	stm32mp_clk_disable(RTCAPB);
33 
34 	return 0;
35 }
36