| Jorge Ramirez-Ortiz | 5ff5eee | 2018-09-23 09:41:10 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2018, Renesas Electronics Corporation. All rights reserved. |
| 3 | * |
| 4 | * SPDX-License-Identifier: BSD-3-Clause |
| 5 | */ |
| 6 | |
| 7 | #include <arch.h> |
| 8 | #include <asm_macros.S> |
| 9 | #include "rcar_def.h" |
| 10 | |
| 11 | .global rcar_pwrc_switch_stack |
| 12 | .global rcar_pwrc_save_generic_timer |
| 13 | .global rcar_pwrc_restore_generic_timer |
| 14 | |
| 15 | #define OFFSET_SP_X9_X10 (0x00) |
| 16 | #define OFFSET_CNTFID0 (0x10) |
| 17 | #define OFFSET_CNTPCT_EL0 (0x18) |
| 18 | #define OFFSET_TIMER_COUNT (0x20) |
| 19 | |
| 20 | /* |
| 21 | * x0 : jump address, |
| 22 | * x1 : stack address, |
| 23 | * x2 : arg, |
| 24 | * x3 : stack address (temporary) |
| 25 | */ |
| 26 | func rcar_pwrc_switch_stack |
| 27 | |
| 28 | /* lr to stack */ |
| 29 | stp x29, x30, [sp,#-16] |
| 30 | |
| 31 | /* change stack pointer */ |
| 32 | mov x3, sp |
| 33 | mov sp, x1 |
| 34 | |
| 35 | /* save stack pointer */ |
| 36 | sub sp, sp, #16 |
| 37 | stp x0, x3, [sp] |
| 38 | |
| 39 | /* data synchronization barrier */ |
| 40 | dsb sy |
| 41 | |
| 42 | /* jump to code */ |
| 43 | mov x1, x0 |
| 44 | mov x0, x2 |
| 45 | blr x1 |
| 46 | |
| 47 | /* load stack pointer */ |
| 48 | ldp x0, x2, [sp,#0] |
| 49 | |
| 50 | /* change stack pointer */ |
| 51 | mov sp, x2 |
| 52 | |
| 53 | /* return */ |
| 54 | ldp x29, x30, [sp,#-16] |
| 55 | ret |
| 56 | endfunc rcar_pwrc_switch_stack |
| 57 | |
| 58 | /* x0 : stack pointer base address */ |
| 59 | func rcar_pwrc_save_generic_timer |
| 60 | |
| 61 | stp x9, x10, [x0, #OFFSET_SP_X9_X10] |
| 62 | |
| 63 | /* save CNTFID0 and cntpct_el0 */ |
| 64 | mov_imm x10, (RCAR_CNTC_BASE + CNTFID_OFF) |
| 65 | ldr x9, [x10] |
| 66 | mrs x10, cntpct_el0 |
| 67 | stp x9, x10, [x0, #OFFSET_CNTFID0] |
| 68 | |
| 69 | ldp x9, x10, [x0, #OFFSET_SP_X9_X10] |
| 70 | |
| 71 | ret |
| 72 | endfunc rcar_pwrc_save_generic_timer |
| 73 | |
| 74 | /* x0 : Stack pointer base address */ |
| 75 | func rcar_pwrc_restore_generic_timer |
| 76 | |
| 77 | stp x9, x10, [x0, #OFFSET_SP_X9_X10] |
| 78 | |
| 79 | /* restore CNTFID0 and cntpct_el0 */ |
| 80 | ldr x10, [x0, #OFFSET_CNTFID0] |
| 81 | mov_imm x9, (RCAR_CNTC_BASE + CNTFID_OFF) |
| 82 | str x10, [x9] |
| 83 | ldp x9, x10, [x0, #OFFSET_CNTPCT_EL0] |
| 84 | add x9, x9, x10 |
| 85 | str x9, [x0, #OFFSET_TIMER_COUNT] |
| 86 | |
| 87 | ldp x9, x10, [x0, #OFFSET_SP_X9_X10] |
| 88 | |
| 89 | ret |
| 90 | endfunc rcar_pwrc_restore_generic_timer |