| Marc Zyngier | e771a3d | 2014-07-12 14:24:07 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2013 - ARM Ltd |
| 3 | * Author: Marc Zyngier <marc.zyngier@arm.com> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License version 2 as |
| 7 | * published by the Free Software Foundation. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 16 | */ |
| 17 | |
| 18 | #include <common.h> |
| 19 | #include <stdio_dev.h> |
| 20 | #include <linux/ctype.h> |
| 21 | #include <linux/types.h> |
| 22 | #include <asm/global_data.h> |
| 23 | #include <libfdt.h> |
| 24 | #include <fdt_support.h> |
| 25 | #include <asm/armv7.h> |
| 26 | #include <asm/psci.h> |
| 27 | |
| 28 | static int fdt_psci(void *fdt) |
| 29 | { |
| 30 | #ifdef CONFIG_ARMV7_PSCI |
| 31 | int nodeoff; |
| 32 | int tmp; |
| 33 | |
| 34 | nodeoff = fdt_path_offset(fdt, "/cpus"); |
| 35 | if (nodeoff < 0) { |
| 36 | printf("couldn't find /cpus\n"); |
| 37 | return nodeoff; |
| 38 | } |
| 39 | |
| 40 | /* add 'enable-method = "psci"' to each cpu node */ |
| 41 | for (tmp = fdt_first_subnode(fdt, nodeoff); |
| 42 | tmp >= 0; |
| 43 | tmp = fdt_next_subnode(fdt, tmp)) { |
| 44 | const struct fdt_property *prop; |
| 45 | int len; |
| 46 | |
| 47 | prop = fdt_get_property(fdt, tmp, "device_type", &len); |
| 48 | if (!prop) |
| 49 | continue; |
| 50 | if (len < 4) |
| 51 | continue; |
| 52 | if (strcmp(prop->data, "cpu")) |
| 53 | continue; |
| 54 | |
| 55 | fdt_setprop_string(fdt, tmp, "enable-method", "psci"); |
| 56 | } |
| 57 | |
| 58 | nodeoff = fdt_path_offset(fdt, "/psci"); |
| 59 | if (nodeoff < 0) { |
| 60 | nodeoff = fdt_path_offset(fdt, "/"); |
| 61 | if (nodeoff < 0) |
| 62 | return nodeoff; |
| 63 | |
| 64 | nodeoff = fdt_add_subnode(fdt, nodeoff, "psci"); |
| 65 | if (nodeoff < 0) |
| 66 | return nodeoff; |
| 67 | } |
| 68 | |
| 69 | tmp = fdt_setprop_string(fdt, nodeoff, "compatible", "arm,psci"); |
| 70 | if (tmp) |
| 71 | return tmp; |
| 72 | tmp = fdt_setprop_string(fdt, nodeoff, "method", "smc"); |
| 73 | if (tmp) |
| 74 | return tmp; |
| 75 | tmp = fdt_setprop_u32(fdt, nodeoff, "cpu_suspend", ARM_PSCI_FN_CPU_SUSPEND); |
| 76 | if (tmp) |
| 77 | return tmp; |
| 78 | tmp = fdt_setprop_u32(fdt, nodeoff, "cpu_off", ARM_PSCI_FN_CPU_OFF); |
| 79 | if (tmp) |
| 80 | return tmp; |
| 81 | tmp = fdt_setprop_u32(fdt, nodeoff, "cpu_on", ARM_PSCI_FN_CPU_ON); |
| 82 | if (tmp) |
| 83 | return tmp; |
| 84 | tmp = fdt_setprop_u32(fdt, nodeoff, "migrate", ARM_PSCI_FN_MIGRATE); |
| 85 | if (tmp) |
| 86 | return tmp; |
| 87 | #endif |
| 88 | return 0; |
| 89 | } |
| 90 | |
| 91 | int armv7_update_dt(void *fdt) |
| 92 | { |
| 93 | #ifndef CONFIG_ARMV7_SECURE_BASE |
| 94 | /* secure code lives in RAM, keep it alive */ |
| 95 | fdt_add_mem_rsv(fdt, (unsigned long)__secure_start, |
| 96 | __secure_end - __secure_start); |
| 97 | #endif |
| 98 | |
| 99 | return fdt_psci(fdt); |
| 100 | } |