| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* Copyright (C) 2017 Andes Technology Corporation */ |
| |
| #include <asm/memory.h> |
| |
| .data |
| .global sp_tmp |
| sp_tmp: |
| .long |
| |
| .text |
| .globl suspend2ram |
| .globl cpu_resume |
| |
| suspend2ram: |
| pushm $r0, $r31 |
| #if defined(CONFIG_HWZOL) |
| mfusr $r0, $lc |
| mfusr $r1, $le |
| mfusr $r2, $lb |
| #endif |
| mfsr $r3, $mr0 |
| mfsr $r4, $mr1 |
| mfsr $r5, $mr4 |
| mfsr $r6, $mr6 |
| mfsr $r7, $mr7 |
| mfsr $r8, $mr8 |
| mfsr $r9, $ir0 |
| mfsr $r10, $ir1 |
| mfsr $r11, $ir2 |
| mfsr $r12, $ir3 |
| mfsr $r13, $ir9 |
| mfsr $r14, $ir10 |
| mfsr $r15, $ir12 |
| mfsr $r16, $ir13 |
| mfsr $r17, $ir14 |
| mfsr $r18, $ir15 |
| pushm $r0, $r19 |
| #if defined(CONFIG_FPU) |
| jal store_fpu_for_suspend |
| #endif |
| tlbop FlushAll |
| isb |
| |
| // transfer $sp from va to pa |
| sethi $r0, hi20(PAGE_OFFSET) |
| ori $r0, $r0, lo12(PAGE_OFFSET) |
| movi $r2, PHYS_OFFSET |
| sub $r1, $sp, $r0 |
| add $r2, $r1, $r2 |
| |
| // store pa($sp) to sp_tmp |
| sethi $r1, hi20(sp_tmp) |
| swi $r2, [$r1 + lo12(sp_tmp)] |
| |
| pushm $r16, $r25 |
| pushm $r29, $r30 |
| #ifdef CONFIG_CACHE_L2 |
| jal dcache_wb_all_level |
| #else |
| jal cpu_dcache_wb_all |
| #endif |
| popm $r29, $r30 |
| popm $r16, $r25 |
| |
| // get wake_mask and loop in standby |
| la $r1, wake_mask |
| lwi $r1, [$r1] |
| self_loop: |
| standby wake_grant |
| mfsr $r2, $ir15 |
| and $r2, $r1, $r2 |
| beqz $r2, self_loop |
| |
| // set ipc to resume address |
| la $r1, resume_addr |
| lwi $r1, [$r1] |
| mtsr $r1, $ipc |
| isb |
| |
| // reset psw, turn off the address translation |
| li $r2, 0x7000a |
| mtsr $r2, $ipsw |
| isb |
| |
| iret |
| cpu_resume: |
| // translate the address of sp_tmp variable to pa |
| la $r1, sp_tmp |
| sethi $r0, hi20(PAGE_OFFSET) |
| ori $r0, $r0, lo12(PAGE_OFFSET) |
| movi $r2, PHYS_OFFSET |
| sub $r1, $r1, $r0 |
| add $r1, $r1, $r2 |
| |
| // access the sp_tmp to get stack pointer |
| lwi $sp, [$r1] |
| |
| popm $r0, $r19 |
| #if defined(CONFIG_HWZOL) |
| mtusr $r0, $lb |
| mtusr $r1, $lc |
| mtusr $r2, $le |
| #endif |
| mtsr $r3, $mr0 |
| mtsr $r4, $mr1 |
| mtsr $r5, $mr4 |
| mtsr $r6, $mr6 |
| mtsr $r7, $mr7 |
| mtsr $r8, $mr8 |
| // set original psw to ipsw |
| mtsr $r9, $ir1 |
| |
| mtsr $r11, $ir2 |
| mtsr $r12, $ir3 |
| |
| // set ipc to RR |
| la $r13, RR |
| mtsr $r13, $ir9 |
| |
| mtsr $r14, $ir10 |
| mtsr $r15, $ir12 |
| mtsr $r16, $ir13 |
| mtsr $r17, $ir14 |
| mtsr $r18, $ir15 |
| popm $r0, $r31 |
| |
| isb |
| iret |
| RR: |
| ret |
