linux-kernel - [PATCH v2 1/3] loongarch: export loongarch pm interface

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Message-Id: <20230522093156.7108-2-zhuyinbo@loongson.cn>
Date:   Mon, 22 May 2023 17:31:54 +0800
From:   Yinbo Zhu <zhuyinbo@...ngson.cn>
To:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Huacai Chen <chenhuacai@...nel.org>,
        WANG Xuerui <kernel@...0n.name>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Pavel Machek <pavel@....cz>,
        Tiezhu Yang <yangtiezhu@...ngson.cn>,
        Marc Zyngier <maz@...nel.org>,
        Youling Tang <tangyouling@...ngson.cn>,
        Baoqi Zhang <zhangbaoqi@...ngson.cn>,
        Arnd Bergmann <arnd@...db.de>, Yun Liu <liuyun@...ngson.cn>,
        linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, loongarch@...ts.linux.dev
Cc:     Jianmin Lv <lvjianmin@...ngson.cn>, wanghongliang@...ngson.cn,
        Liu Peibao <liupeibao@...ngson.cn>,
        loongson-kernel@...ts.loongnix.cn, Yinbo Zhu <zhuyinbo@...ngson.cn>
Subject: [PATCH 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@...ngson.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