arm/mach-at91/pm_suspend.S

1 /* SPDX-License-Identifier: GPL-2.0-only */
3  * arch/arm/mach-at91/pm_slow_clock.S
13 #include "pm_data-offsets.h"
16 .arch armv7-a
32  * Side effects: overwrites r7, r8
39 	b	2f
45 	bne	2b
51  * Side effects: overwrites r7
56 	beq	1b
62  * Side effects: overwrites r7
67 	beq	1b
73  * Side effects: overwrites r7
92  * @ena: 0 - disable regulator
93  *	 1 - enable regulator
95  * Side effects: overwrites r7, r8, r9, r10
125  * Enable self-refresh
127  * Side effects: overwrites r2, r3, tmp1, tmp2, tmp3, r7
164 	/* Switch to self-refresh. */
170 	/* Wait for self-refresh enter. */
176 	/* Disable DX DLLs for non-backup modes. */
214  * Disable self-refresh
216  * Side effects: overwrites r2, r3, tmp1, tmp2, tmp3
248 	/* Enable quasi-dynamic programming. */
252 	/* De-assert SDRAM initialization. */
257 	/* Quasi-dynamic programming done. */
266 	/* DLL soft-reset + DLL lock wait + ITM reset */
277 	/* Enable quasi-dynamic programming. */
296 	/* Trigger self-refresh exit. */
302 	/* Wait for self-refresh exit done. */
333  * Enable self-refresh
347 	/* Active SDRAM self-refresh mode */
350 	b	sr_ena_exit
360 	/* LPDDR1 --> force DDR2 mode during self-refresh */
370 	/* Active DDRC self-refresh mode */
391 	/* Active DDRC self-refresh mode */
399 	b	sr_ena_exit
405 	/* Active SDRAMC self-refresh mode */
419  * Disable self-refresh
438 	  * For exiting the self-refresh mode, do nothing,
439 	  * automatically exit the self-refresh mode.
441 	b	sr_dis_exit
464 	b	sr_dis_exit
492 	b	1f
517 	bne	2b
534 	b	6f
551 	beq	3b
588 	beq	1b
590 	/* Switch the main clock source to 12-MHz RC oscillator */
675 	bne	4b
733 	b	2f
797 	beq	3b
798 	b	2f
812 	beq	1b
819  * Side effects: overwrites tmp1, tmp2, tmp3
840 	b	e_ps
846 	b	e_ps
852 	b	e_ps
858 	b	e_ps
864 	b	e_ps
870 	b	e_ps
876 	b	e_ps
882 	b	e_ps
898 	b	e_loop
907  * Side effects: overwrites tmp1, tmp2
924 	b	r_ps
930 	b	r_ps
936 	b	r_ps
942 	b	r_ps
948 	b	r_ps
954 	b	r_ps
960 	b	r_ps
966 	b	r_ps
989 	b	r_loop
1007 	 * - MAINCK if using ULP0 fast variant
1008 	 * - slow clock, otherwise
1030 	b	ulp_exit
1034 	b	ulp_exit
1076 	beq	1b
1091 /* at91_pm_suspend_in_sram must be 8-byte aligned per the requirements of fncpy() */
1095 	stmfd	sp!, {r4 - r12, lr}
1120 	 * to RAM may be limited while in self-refresh.
1155 	/* Active the self-refresh mode */
1165 	b	exit_suspend
1171 	b	exit_suspend
1177 	/* Exit the self-refresh mode */
1181 	ldmfd	sp!, {r4 - r12, pc}
1244 	.word .-at91_pm_suspend_in_sram