arch/sh/boards/mach-se/7724/sdram.S

Source file repositories/reference/linux-study-clean/arch/sh/boards/mach-se/7724/sdram.S

File Facts

System
Linux kernel
Corpus path
arch/sh/boards/mach-se/7724/sdram.S
Extension
.S
Size
3078 bytes
Lines
129
Domain
Architecture Layer
Bucket
arch/sh
Inferred role
Architecture Layer: arch/sh
Status
atlas-only

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

#include <linux/sys.h>
#include <linux/errno.h>
#include <linux/linkage.h>
#include <asm/asm-offsets.h>
#include <asm/suspend.h>
#include <asm/romimage-macros.h>

/* code to enter and leave self-refresh. must be self-contained.
 * this code will be copied to on-chip memory and executed from there.
 */
	.balign 4
ENTRY(ms7724se_sdram_enter_start)

	/* DBSC: put memory in self-refresh mode */

	ED 0xFD000010, 0x00000000 /* DBEN */
	ED 0xFD000040, 0x00000000 /* DBRFPDN0 */
	ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */
	ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */
	ED 0xFD000040, 0x00000001 /* DBRFPDN0 */

	rts
	 nop

ENTRY(ms7724se_sdram_enter_end)

	.balign 4
ENTRY(ms7724se_sdram_leave_start)

	/* DBSC: put memory in auto-refresh mode */

	mov.l	@(SH_SLEEP_MODE, r5), r0
	tst	#SUSP_SH_RSTANDBY, r0
	bf	resume_rstandby

	ED 0xFD000040, 0x00000000 /* DBRFPDN0 */
	WAIT 1
	ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */
	ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */
	ED 0xFD000010, 0x00000001 /* DBEN */
	ED 0xFD000040, 0x00010000 /* DBRFPDN0 */

	rts
	 nop

resume_rstandby:

	/* CPG: setup clocks before restarting external memory */

	ED 0xA4150024, 0x00004000 /* PLLCR */

	mov.l	FRQCRA,r0
	mov.l	@r0,r3
	mov.l	KICK,r1
	or	r1, r3
	mov.l	r3, @r0

	mov.l	LSTATS,r0
	mov	#1,r1
WAIT_LSTATS:
	mov.l	@r0,r3
	tst	r1,r3
	bf	WAIT_LSTATS

	/* DBSC: re-initialize and put in auto-refresh */

	ED 0xFD000108, 0x00000181 /* DBPDCNT0 */
	ED 0xFD000020, 0x015B0002 /* DBCONF */
	ED 0xFD000030, 0x03071502 /* DBTR0 */
	ED 0xFD000034, 0x02020102 /* DBTR1 */

Annotation

Implementation Notes