1 /*
2 * Copyright (c) 2016, ARM Limited and Contributors. All rights reserved.
3 *
4 * SPDX-License-Identifier: BSD-3-Clause
5 */
6
7 #include <arm_def.h>
8 #include <assert.h>
9 #include <debug.h>
10 #include <platform_def.h>
11 #include <tzc_dmc500.h>
12
13 /*******************************************************************************
14 * Initialize the DMC500-TrustZone Controller for ARM standard platforms.
15 * Configure both the interfaces on Region 0 with no access, Region 1 with
16 * secure access only, and the remaining DRAM regions access from the
17 * given Non-Secure masters.
18 *
19 * When booting an EL3 payload, this is simplified: we configure region 0 with
20 * secure access only and do not enable any other region.
21 ******************************************************************************/
arm_tzc_dmc500_setup(tzc_dmc500_driver_data_t * plat_driver_data)22 void arm_tzc_dmc500_setup(tzc_dmc500_driver_data_t *plat_driver_data)
23 {
24 assert(plat_driver_data);
25
26 INFO("Configuring DMC-500 TZ Settings\n");
27
28 tzc_dmc500_driver_init(plat_driver_data);
29
30 #ifndef EL3_PAYLOAD_BASE
31 /* Region 0 set to no access by default */
32 tzc_dmc500_configure_region0(TZC_REGION_S_NONE, 0);
33
34 /* Region 1 set to cover Secure part of DRAM */
35 tzc_dmc500_configure_region(1, ARM_AP_TZC_DRAM1_BASE,
36 ARM_EL3_TZC_DRAM1_END,
37 TZC_REGION_S_RDWR,
38 0);
39
40 /* Region 2 set to cover Non-Secure access to 1st DRAM address range.*/
41 tzc_dmc500_configure_region(2,
42 ARM_NS_DRAM1_BASE,
43 ARM_NS_DRAM1_END,
44 ARM_TZC_NS_DRAM_S_ACCESS,
45 PLAT_ARM_TZC_NS_DEV_ACCESS);
46
47 /* Region 3 set to cover Non-Secure access to 2nd DRAM address range */
48 tzc_dmc500_configure_region(3,
49 ARM_DRAM2_BASE,
50 ARM_DRAM2_END,
51 ARM_TZC_NS_DRAM_S_ACCESS,
52 PLAT_ARM_TZC_NS_DEV_ACCESS);
53 #else
54 /* Allow secure access only to DRAM for EL3 payloads */
55 tzc_dmc500_configure_region0(TZC_REGION_S_RDWR, 0);
56 #endif
57 /*
58 * Raise an exception if a NS device tries to access secure memory
59 * TODO: Add interrupt handling support.
60 */
61 tzc_dmc500_set_action(TZC_ACTION_RV_LOWERR);
62
63 /*
64 * Flush the configuration settings to have an affect. Validate
65 * flush by checking FILTER_EN is set on region 1 attributes
66 * register.
67 */
68 tzc_dmc500_config_complete();
69
70 /*
71 * Wait for the flush to complete.
72 * TODO: Have a timeout for this loop
73 */
74 while (tzc_dmc500_verify_complete())
75 ;
76 }
77