projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 2e1ae9c0 LYB |
1 | /* |
| 2 | * ePAPR para-virtualization support. | |
| 3 | * | |
| 4 | * This program is free software; you can redistribute it and/or modify | |
| 5 | * it under the terms of the GNU General Public License, version 2, as | |
| 6 | * published by the Free Software Foundation. | |
| 7 | * | |
| 8 | * This program is distributed in the hope that it will be useful, | |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 11 | * GNU General Public License for more details. | |
| 12 | * | |
| 13 | * You should have received a copy of the GNU General Public License | |
| 14 | * along with this program; if not, write to the Free Software | |
| 15 | * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. | |
| 16 | * | |
| 17 | * Copyright (C) 2012 Freescale Semiconductor, Inc. | |
| 18 | */ | |
| 19 | ||
| 20 | #include <linux/of.h> | |
| 26a2056e | 21 | #include <linux/of_fdt.h> |
| 2e1ae9c0 LYB |
22 | #include <asm/epapr_hcalls.h> |
| 23 | #include <asm/cacheflush.h> | |
| 24 | #include <asm/code-patching.h> | |
| 2f979de8 LYB |
25 | #include <asm/machdep.h> |
| 26 | ||
| f9294e98 | 27 | #if !defined(CONFIG_64BIT) || defined(CONFIG_PPC_BOOK3E_64) |
| 2f979de8 LYB |
28 | extern void epapr_ev_idle(void); |
| 29 | extern u32 epapr_ev_idle_start[]; | |
| f9294e98 | 30 | #endif |
| 2e1ae9c0 LYB |
31 | |
| 32 | bool epapr_paravirt_enabled; | |
| 8067bd8a | 33 | static bool __maybe_unused epapr_has_idle; |
| 2e1ae9c0 | 34 | |
| 4e21b94c LT |
35 | static int __init early_init_dt_scan_epapr(unsigned long node, |
| 36 | const char *uname, | |
| 37 | int depth, void *data) | |
| 2e1ae9c0 | 38 | { |
| 2e1ae9c0 | 39 | const u32 *insts; |
| 9d0c4dfe | 40 | int len; |
| 4e21b94c | 41 | int i; |
| 2e1ae9c0 | 42 | |
| 4e21b94c | 43 | insts = of_get_flat_dt_prop(node, "hcall-instructions", &len); |
| 2e1ae9c0 | 44 | if (!insts) |
| 4e21b94c | 45 | return 0; |
| 2e1ae9c0 LYB |
46 | |
| 47 | if (len % 4 || len > (4 * 4)) | |
| 4e21b94c | 48 | return -1; |
| 2e1ae9c0 | 49 | |
| 2f979de8 | 50 | for (i = 0; i < (len / 4); i++) { |
| 235959be AG |
51 | u32 inst = be32_to_cpu(insts[i]); |
| 52 | patch_instruction(epapr_hypercall_start + i, inst); | |
| f9294e98 | 53 | #if !defined(CONFIG_64BIT) || defined(CONFIG_PPC_BOOK3E_64) |
| 235959be | 54 | patch_instruction(epapr_ev_idle_start + i, inst); |
| f9294e98 | 55 | #endif |
| 2f979de8 LYB |
56 | } |
| 57 | ||
| f9294e98 | 58 | #if !defined(CONFIG_64BIT) || defined(CONFIG_PPC_BOOK3E_64) |
| 4e21b94c | 59 | if (of_get_flat_dt_prop(node, "has-idle", NULL)) |
| 83e267d7 | 60 | epapr_has_idle = true; |
| f9294e98 | 61 | #endif |
| 2e1ae9c0 LYB |
62 | |
| 63 | epapr_paravirt_enabled = true; | |
| 64 | ||
| 4e21b94c LT |
65 | return 1; |
| 66 | } | |
| 67 | ||
| 68 | int __init epapr_paravirt_early_init(void) | |
| 69 | { | |
| 70 | of_scan_flat_dt(early_init_dt_scan_epapr, NULL); | |
| 71 | ||
| 2e1ae9c0 LYB |
72 | return 0; |
| 73 | } | |
| 74 | ||
| 83e267d7 SY |
75 | static int __init epapr_idle_init(void) |
| 76 | { | |
| 440d74d1 | 77 | #if !defined(CONFIG_64BIT) || defined(CONFIG_PPC_BOOK3E_64) |
| 83e267d7 SY |
78 | if (epapr_has_idle) |
| 79 | ppc_md.power_save = epapr_ev_idle; | |
| 440d74d1 | 80 | #endif |
| 83e267d7 SY |
81 | |
| 82 | return 0; | |
| 83 | } | |
| 84 | ||
| 85 | postcore_initcall(epapr_idle_init); |