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| /*
| * (C) Copyright 2017 Rockchip Electronics Co., Ltd.
| *
| * SPDX-License-Identifier: GPL-2.0+
| */
|
| #include <asm/macro.h>
| #include <asm-offsets.h>
| #include <asm/psci.h>
| #include <config.h>
| #include <linux/linkage.h>
|
| .globl cpu_suspend
| .globl cpu_do_suspend
| .globl cpu_suspend_save
| .globl cpu_resume
| .globl cpu_do_resume
|
| /*
| * int cpu_suspend(unsigned long arg, int (*fn)(unsigned long))
| * @arg will be passed to fn as argument
| * return value: 0 - cpu resumed from suspended state.
| * -1 - cpu not suspended.
| */
| ENTRY(cpu_suspend)
| /*
| * Save x8~x30(lr is x30, sp is x29), total (23 + 1 reserved)*8=192
| */
| stp x29, lr, [sp, #-192]!
| /* Reserve 8-byte after x8, just for offset with 16-byte aligned */
| str x8, [sp, #16]
| stp x9, x10, [sp, #32]
| stp x11, x12, [sp, #48]
| stp x13, x14, [sp, #64]
| stp x15, x16, [sp, #80]
| stp x17, x18, [sp, #96]
| stp x19, x20, [sp,#112]
| stp x21, x22, [sp,#128]
| stp x23, x24, [sp,#144]
| stp x25, x26, [sp,#160]
| stp x27, x28, [sp,#176]
|
| mov x19, sp
| mov x20, x0
| mov x21, x1
|
| /* Save arch specific suspend fn and arg to stack */
| sub sp, sp, #PM_CTX_SIZE
| stp x0, x1, [sp, #-16]!
|
| /* x18 is gd, save it to _suspend_gd !! */
| adr x0, _suspend_gd
| str x18, [x0]
|
| /* x0: pm_ctx; x1: sp where restore x8~x30 from */
| add x0, sp, #16
| mov x1, x19
| bl cpu_suspend_save
|
| adr lr, aborted
| /* Jump to arch specific suspend */
| mov x0, x20
| br x21
|
| /* Should never reach here, otherwise failed */
| aborted:
| /* cpu not suspended */
| add sp, sp, #(16 + PM_CTX_SIZE)
| /* Return -1 to the caller */
| mov x0, #(-1)
|
| suspend_return:
| ldr x8, [sp, #16]
| ldp x9, x10, [sp, #32]
| ldp x11, x12, [sp, #48]
| ldp x13, x14, [sp, #64]
| ldp x15, x16, [sp, #80]
| ldp x17, x18, [sp, #96]
| ldp x19, x20, [sp,#112]
| ldp x21, x22, [sp,#128]
| ldp x23, x24, [sp,#144]
| ldp x25, x26, [sp,#160]
| ldp x27, x28, [sp,#176]
| ldp x29, lr, [sp], #192
| ret
| ENDPROC(cpu_suspend)
|
| ENTRY(cpu_do_suspend)
| /*
| * Save temporary x2~x12, total: 11*8=88, maybe you need not so many
| * registers now, but I save them for future extendion.
| */
| stp x2, x3, [sp, #-88]!
| stp x4, x5, [sp, #16]
| stp x6, x7, [sp, #32]
| stp x8, x9, [sp, #48]
| stp x10, x11, [sp,#64]
| str x12, [sp, #80]
|
| /*
| * Save core registers.
| *
| * Note: If you want to add/sub the register here,
| * remember update suspend_regs[] of struct pm_ctx.
| */
| mrs x2, vbar_el2
| mrs x3, cptr_el2
| mrs x4, ttbr0_el2
| mrs x5, tcr_el2
| mrs x6, mair_el2
| mrs x7, cntvoff_el2
| mrs x8, sctlr_el2
| mrs x9, hcr_el2
| mrs x10, daif
|
| stp x2, x3, [x0, #0]
| stp x4, x5, [x0, #16]
| stp x6, x7, [x0, #32]
| stp x8, x9, [x0, #48]
| str x10, [x0, #64]
|
| /* Restore temporary x2~x12 */
| ldp x4, x5, [sp, #16]
| ldp x6, x7, [sp, #32]
| ldp x8, x9, [sp, #48]
| ldp x10, x11, [sp,#64]
| ldr x12, [sp, #80]
| ldp x2, x3, [sp], #88
| ret
| ENDPROC(cpu_do_suspend)
|
| ENTRY(cpu_resume)
| /* Disable interrupt */
| msr daifset, #0x03
|
| /* Load gd !! */
| adr x1, _suspend_gd
| ldr x2, [x1]
|
| /* Get pm_ctx */
| add x2, x2, #PM_CTX_PHYS
| ldr x0, [x2]
|
| /* Need x0=x0-16, because cpu_do_resume needs it */
| ldp x1, lr, [x0], #16
| mov sp, x1
| ret
| ENDPROC(cpu_resume)
|
| /*
| * void sm_do_cpu_do_resume(paddr suspend_regs) __noreturn;
| * Restore the registers stored when cpu_do_suspend
| * x0 points to the physical base address of the suspend_regs
| * field of struct pm_ctx.
| */
| ENTRY(cpu_do_resume)
| /*
| * Invalidate local tlb entries before turning on MMU !!!
| */
| tlbi alle2
| dsb sy
| isb
|
| ldp x2, x3, [x0]
| ldp x4, x5, [x0, #16]
| ldp x6, x7, [x0, #32]
| ldp x8, x9, [x0, #48]
| ldp x10, x11, [x0, #64]
| ldr x12, [x0, #80]
|
| /* Restore core register */
| msr vbar_el2, x2
| msr cptr_el2, x3
| msr ttbr0_el2, x4
| msr tcr_el2, x5
| msr mair_el2, x6
| msr cntvoff_el2, x7
| msr hcr_el2, x9
|
| /* Enable MMU here */
| msr sctlr_el2, x8
| dsb sy
| isb
|
| /* resume interrupt */
| msr daif, x10
|
| mov x0, #0
| b suspend_return
| ENDPROC(cpu_do_resume)
|
| .align 3
| _suspend_gd:
| .long 0x0
|
|
