1 files changed, 144 insertions, 0 deletions
diff --git a/arch/sh/kernel/cpu/sh3/swsusp.S b/arch/sh/kernel/cpu/sh3/swsusp.S
new file mode 100644
index 000000000..dc111c4cc
--- /dev/null
+++ b/arch/sh/kernel/cpu/sh3/swsusp.S
@@ -0,0 +1,144 @@
+/* SPDX-License-Identifier: GPL-2.0
+ *
+ * arch/sh/kernel/cpu/sh3/swsusp.S
+ *
+ * Copyright (C) 2009 Magnus Damm
+ */
+#include <linux/sys.h>
+#include <linux/errno.h>
+#include <linux/linkage.h>
+#include <asm/asm-offsets.h>
+#include <asm/page.h>
+
+#define k0	r0
+#define k1	r1
+#define k2	r2
+#define k3	r3
+#define k4	r4
+
+! swsusp_arch_resume()
+! - copy restore_pblist pages
+! - restore registers from swsusp_arch_regs_cpu0
+
+ENTRY(swsusp_arch_resume)
+	mov.l	1f, r15
+	mov.l	2f, r4
+	mov.l	@r4, r4
+
+swsusp_copy_loop:
+	mov	r4, r0
+	cmp/eq	#0, r0
+	bt	swsusp_restore_regs
+
+	mov.l	@(PBE_ADDRESS, r4), r2
+	mov.l	@(PBE_ORIG_ADDRESS, r4), r5
+
+	mov	#(PAGE_SIZE >> 10), r3
+	shll8	r3
+	shlr2	r3 /* PAGE_SIZE / 16 */
+swsusp_copy_page:
+	dt	r3
+	mov.l	@r2+,r1   /*  16n+0 */
+	mov.l	r1,@r5
+	add	#4,r5
+	mov.l	@r2+,r1	  /*  16n+4 */
+	mov.l	r1,@r5
+	add	#4,r5
+	mov.l	@r2+,r1   /*  16n+8 */
+	mov.l	r1,@r5
+	add	#4,r5
+	mov.l	@r2+,r1   /*  16n+12 */
+	mov.l	r1,@r5
+	bf/s	swsusp_copy_page
+	 add	#4,r5
+
+	bra	swsusp_copy_loop
+	 mov.l	@(PBE_NEXT, r4), r4
+
+swsusp_restore_regs:
+	! BL=0: R7->R0 is bank0
+	mov.l	3f, r8
+	mov.l	4f, r5
+	jsr	@r5
+	 nop
+
+	! BL=1: R7->R0 is bank1
+	lds	k2, pr
+	ldc	k3, ssr
+
+	mov.l	@r15+, r0
+	mov.l	@r15+, r1
+	mov.l	@r15+, r2
+	mov.l	@r15+, r3
+	mov.l	@r15+, r4
+	mov.l	@r15+, r5
+	mov.l	@r15+, r6
+	mov.l	@r15+, r7
+
+	rte
+	 nop
+	! BL=0: R7->R0 is bank0
+
+	.align	2
+1:	.long	swsusp_arch_regs_cpu0
+2:	.long	restore_pblist
+3:	.long	0x20000000 ! RB=1
+4:	.long	restore_regs
+
+! swsusp_arch_suspend()
+! - prepare pc for resume, return from function without swsusp_save on resume
+! - save registers in swsusp_arch_regs_cpu0
+! - call swsusp_save write suspend image
+
+ENTRY(swsusp_arch_suspend)
+	sts	pr, r0		! save pr in r0
+	mov	r15, r2		! save sp in r2
+	mov	r8, r5		! save r8 in r5
+	stc	sr, r1
+	ldc	r1, ssr		! save sr in ssr
+	mov.l	1f, r1
+	ldc	r1, spc		! setup pc value for resuming
+	mov.l	5f, r15		! use swsusp_arch_regs_cpu0 as stack
+	mov.l	6f, r3
+	add	r3, r15		! save from top of structure
+
+	! BL=0: R7->R0 is bank0
+	mov.l	2f, r3		! get new SR value for bank1
+	mov	#0, r4
+	mov.l	7f, r1
+	jsr	@r1		! switch to bank1 and save bank1 r7->r0
+	 not	r4, r4
+
+	! BL=1: R7->R0 is bank1
+	stc	r2_bank, k0	! fetch old sp from r2_bank0
+	mov.l	3f, k4		! SR bits to clear in k4
+	mov.l	8f, k1
+	jsr	@k1		! switch to bank0 and save all regs
+	 stc	r0_bank, k3	! fetch old pr from r0_bank0
+
+	! BL=0: R7->R0 is bank0
+	mov	r2, r15		! restore old sp
+	mov	r5, r8		! restore old r8
+	stc	ssr, r1
+	ldc	r1, sr		! restore old sr
+	lds	r0, pr		! restore old pr
+	mov.l	4f, r0
+	jmp	@r0
+	 nop
+
+swsusp_call_save:
+	mov	r2, r15		! restore old sp
+	mov	r5, r8		! restore old r8
+	lds	r0, pr		! restore old pr
+	rts
+	 mov	#0, r0
+
+	.align	2
+1:	.long	swsusp_call_save
+2:	.long	0x20000000 ! RB=1
+3:	.long	0xdfffffff ! RB=0
+4:	.long	swsusp_save
+5:	.long	swsusp_arch_regs_cpu0
+6:	.long	SWSUSP_ARCH_REGS_SIZE
+7:	.long	save_low_regs
+8:	.long	save_regs