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