1 /*
2  * (C) Copyright 2016 Linaro
3  * Jon Medhurst <tixy@linaro.org>
4  *
5  * TC2 specific code for Versatile Express.
6  *
7  * SPDX-License-Identifier:	GPL-2.0+
8  */
9 
10 #include <asm/armv7.h>
11 #include <asm/io.h>
12 #include <asm/u-boot.h>
13 #include <common.h>
14 #include <linux/libfdt.h>
15 
16 #define SCC_BASE	0x7fff0000
17 
18 bool armv7_boot_nonsec_default(void)
19 {
20 #ifdef CONFIG_ARMV7_BOOT_SEC_DEFAULT
21 	return false
22 #else
23 	/*
24 	 * The Serial Configuration Controller (SCC) register at address 0x700
25 	 * contains flags for configuring the behaviour of the Boot Monitor
26 	 * (which CPUs execute from reset). Two of these bits are of interest:
27 	 *
28 	 * bit 12 = Use per-cpu mailboxes for power management
29 	 * bit 13 = Power down the non-boot cluster
30 	 *
31 	 * It is only when both of these are false that U-Boot's current
32 	 * implementation of 'nonsec' mode can work as expected because we
33 	 * rely on getting all CPUs to execute _nonsec_init, so let's check that.
34 	 */
35 	return (readl((u32 *)(SCC_BASE + 0x700)) & ((1 << 12) | (1 << 13))) == 0;
36 #endif
37 }
38 
39 #ifdef CONFIG_OF_BOARD_SETUP
40 int ft_board_setup(void *fdt, bd_t *bd)
41 {
42 	int offset, tmp, len;
43 	const struct fdt_property *prop;
44 	const char *cci_compatible = "arm,cci-400-ctrl-if";
45 
46 #ifdef CONFIG_ARMV7_NONSEC
47 	if (!armv7_boot_nonsec())
48 		return 0;
49 #else
50 	return 0;
51 #endif
52 	/* Booting in nonsec mode, disable CCI access */
53 	offset = fdt_path_offset(fdt, "/cpus");
54 	if (offset < 0) {
55 		printf("couldn't find /cpus\n");
56 		return offset;
57 	}
58 
59 	/* delete cci-control-port in each cpu node */
60 	for (tmp = fdt_first_subnode(fdt, offset); tmp >= 0;
61 	     tmp = fdt_next_subnode(fdt, tmp))
62 		fdt_delprop(fdt, tmp, "cci-control-port");
63 
64 	/* disable all ace cci slave ports */
65 	offset = fdt_node_offset_by_prop_value(fdt, offset, "compatible",
66 					       cci_compatible, 20);
67 	while (offset > 0) {
68 		prop = fdt_get_property(fdt, offset, "interface-type",
69 					&len);
70 		if (!prop)
71 			continue;
72 		if (len < 4)
73 			continue;
74 		if (strcmp(prop->data, "ace"))
75 			continue;
76 
77 		fdt_setprop_string(fdt, offset, "status", "disabled");
78 
79 		offset = fdt_node_offset_by_prop_value(fdt, offset, "compatible",
80 						       cci_compatible, 20);
81 	}
82 
83 	return 0;
84 }
85 #endif /* CONFIG_OF_BOARD_SETUP */
86