[v2,1/3] loongarch: export loongarch pm interface

Some Power Management Controllers need to support DTS and will use
the suspend interface thus this patch was to export such interface
for their use.

Signed-off-by: Yinbo Zhu <zhuyinbo@loongson.cn>
---
 arch/loongarch/include/asm/acpi.h    |  5 ++---
 arch/loongarch/include/asm/suspend.h | 10 ++++++++++
 arch/loongarch/power/suspend.c       | 10 +++++-----
 arch/loongarch/power/suspend_asm.S   |  8 ++++----
 4 files changed, 21 insertions(+), 12 deletions(-)
 create mode 100644 arch/loongarch/include/asm/suspend.h

在 2023/5/24 上午9:57, Huacai Chen 写道:
> Hi, Yinbo,
> 
> The title can be regular:
>   LoongArch: Export some arch-specific pm interfaces
> 
> And in commit message,
> "Some Power Management Controllers" should be
> "Some power management controllers" or
> "Some PMC (Power Management Controllers)"


okay, I got it.

Thanks.
> 
> Huacai
> 
> On Mon, May 22, 2023 at 5:32 PM Yinbo Zhu <zhuyinbo@loongson.cn> wrote:
>>
>> Some Power Management Controllers need to support DTS and will use
>> the suspend interface thus this patch was to export such interface
>> for their use.
>>
>> Signed-off-by: Yinbo Zhu <zhuyinbo@loongson.cn>
>> ---
>>   arch/loongarch/include/asm/acpi.h    |  5 ++---
>>   arch/loongarch/include/asm/suspend.h | 10 ++++++++++
>>   arch/loongarch/power/suspend.c       | 10 +++++-----
>>   arch/loongarch/power/suspend_asm.S   |  8 ++++----
>>   4 files changed, 21 insertions(+), 12 deletions(-)
>>   create mode 100644 arch/loongarch/include/asm/suspend.h
>>
>> diff --git a/arch/loongarch/include/asm/acpi.h b/arch/loongarch/include/asm/acpi.h
>> index 976a810352c6..d63507cc705f 100644
>> --- a/arch/loongarch/include/asm/acpi.h
>> +++ b/arch/loongarch/include/asm/acpi.h
>> @@ -8,6 +8,7 @@
>>   #ifndef _ASM_LOONGARCH_ACPI_H
>>   #define _ASM_LOONGARCH_ACPI_H
>>
>> +#include <asm/suspend.h>
>>   #ifdef CONFIG_ACPI
>>   extern int acpi_strict;
>>   extern int acpi_disabled;
>> @@ -37,13 +38,11 @@ extern struct list_head acpi_wakeup_device_list;
>>
>>   extern int loongarch_acpi_suspend(void);
>>   extern int (*acpi_suspend_lowlevel)(void);
>> -extern void loongarch_suspend_enter(void);
>>
>>   static inline unsigned long acpi_get_wakeup_address(void)
>>   {
>>   #ifdef CONFIG_SUSPEND
>> -       extern void loongarch_wakeup_start(void);
>> -       return (unsigned long)loongarch_wakeup_start;
>> +       return (unsigned long)loongson_wakeup_start;
>>   #endif
>>          return 0UL;
>>   }
>> diff --git a/arch/loongarch/include/asm/suspend.h b/arch/loongarch/include/asm/suspend.h
>> new file mode 100644
>> index 000000000000..a40b42f4f7f3
>> --- /dev/null
>> +++ b/arch/loongarch/include/asm/suspend.h
>> @@ -0,0 +1,10 @@
>> +/* SPDX-License-Identifier: GPL-2.0 */
>> +#ifndef __ASM_SUSPEND_H
>> +#define __ASM_SUSPEND_H
>> +
>> +void loongson_common_resume(void);
>> +void loongson_common_suspend(void);
>> +void loongson_suspend_enter(void);
>> +void loongson_wakeup_start(void);
>> +
>> +#endif
>> diff --git a/arch/loongarch/power/suspend.c b/arch/loongarch/power/suspend.c
>> index 5e19733e5e05..0587681b33ce 100644
>> --- a/arch/loongarch/power/suspend.c
>> +++ b/arch/loongarch/power/suspend.c
>> @@ -27,7 +27,7 @@ struct saved_registers {
>>   };
>>   static struct saved_registers saved_regs;
>>
>> -static void arch_common_suspend(void)
>> +void loongson_common_suspend(void)
>>   {
>>          save_counter();
>>          saved_regs.pgd = csr_read64(LOONGARCH_CSR_PGDL);
>> @@ -40,7 +40,7 @@ static void arch_common_suspend(void)
>>          loongarch_suspend_addr = loongson_sysconf.suspend_addr;
>>   }
>>
>> -static void arch_common_resume(void)
>> +void loongson_common_resume(void)
>>   {
>>          sync_counter();
>>          local_flush_tlb_all();
>> @@ -62,12 +62,12 @@ int loongarch_acpi_suspend(void)
>>          enable_gpe_wakeup();
>>          enable_pci_wakeup();
>>
>> -       arch_common_suspend();
>> +       loongson_common_suspend();
>>
>>          /* processor specific suspend */
>> -       loongarch_suspend_enter();
>> +       loongson_suspend_enter();
>>
>> -       arch_common_resume();
>> +       loongson_common_resume();
>>
>>          return 0;
>>   }
>> diff --git a/arch/loongarch/power/suspend_asm.S b/arch/loongarch/power/suspend_asm.S
>> index e2fc3b4e31f0..809abd3b119d 100644
>> --- a/arch/loongarch/power/suspend_asm.S
>> +++ b/arch/loongarch/power/suspend_asm.S
>> @@ -57,13 +57,13 @@
>>          .align 12
>>
>>   /* Sleep/wakeup code for Loongson-3 */
>> -SYM_FUNC_START(loongarch_suspend_enter)
>> +SYM_FUNC_START(loongson_suspend_enter)
>>          SETUP_SLEEP
>>          bl              __flush_cache_all
>>
>>          /* Pass RA and SP to BIOS */
>>          addi.d          a1, sp, 0
>> -       la.pcrel        a0, loongarch_wakeup_start
>> +       la.pcrel        a0, loongson_wakeup_start
>>          la.pcrel        t0, loongarch_suspend_addr
>>          ld.d            t0, t0, 0
>>          jirl            a0, t0, 0 /* Call BIOS's STR sleep routine */
>> @@ -72,7 +72,7 @@ SYM_FUNC_START(loongarch_suspend_enter)
>>           * This is where we return upon wakeup.
>>           * Reload all of the registers and return.
>>           */
>> -SYM_INNER_LABEL(loongarch_wakeup_start, SYM_L_GLOBAL)
>> +SYM_INNER_LABEL(loongson_wakeup_start, SYM_L_GLOBAL)
>>          li.d            t0, CSR_DMW0_INIT       # UC, PLV0
>>          csrwr           t0, LOONGARCH_CSR_DMWIN0
>>          li.d            t0, CSR_DMW1_INIT       # CA, PLV0
>> @@ -89,4 +89,4 @@ SYM_INNER_LABEL(loongarch_wakeup_start, SYM_L_GLOBAL)
>>          SETUP_WAKEUP
>>          addi.d          sp, sp, PT_SIZE
>>          jr              ra
>> -SYM_FUNC_END(loongarch_suspend_enter)
>> +SYM_FUNC_END(loongson_suspend_enter)
>> --
>> 2.20.1
>>