Commit 475be50f authored by Claudiu Beznea's avatar Claudiu Beznea Committed by Nicolas Ferre
Browse files

ARM: at91: pm: add support for 2.5V LDO regulator control 



Add support to disable/enable 2.5V LDO regulator when entering/exiting
any ULP mode.

Signed-off-by: default avatarClaudiu Beznea <claudiu.beznea@microchip.com>
Signed-off-by: default avatarNicolas Ferre <nicolas.ferre@microchip.com>
Link: https://lore.kernel.org/r/20210415105010.569620-15-claudiu.beznea@microchip.com
parent 28eb1d40

arch/arm/mach-at91/pm.h

+1 −0
Original line number Diff line number Diff line
@@ -13,6 +13,7 @@ 
#include <soc/at91/at91sam9_ddrsdr.h>

#include <soc/at91/at91sam9_sdramc.h>

#include <soc/at91/sama7-ddr.h>

#include <soc/at91/sama7-sfrbu.h>



#define AT91_MEMCTRL_MC		0

#define AT91_MEMCTRL_SDRAMC	1

arch/arm/mach-at91/pm_suspend.S

+29 −0
Original line number Diff line number Diff line
@@ -83,6 +83,29 @@ tmp3 .req r6 


	.endm



/**

 * Set state for 2.5V low power regulator

 * @ena: 0 - disable regulator

 *	 1 - enable regulator

 *

 * Side effects: overwrites r7, r8, r9, r10

 */

	.macro at91_2_5V_reg_set_low_power ena

#ifdef CONFIG_SOC_SAMA7

	ldr	r7, .sfrbu

	mov	r8, #\ena

	ldr	r9, [r7, #AT91_SFRBU_25LDOCR]

	orr	r9, r9, #AT91_SFRBU_25LDOCR_LP

	cmp	r8, #1

	beq	lp_done_\ena

	bic	r9, r9, #AT91_SFRBU_25LDOCR_LP

lp_done_\ena:

	ldr	r10, =AT91_SFRBU_25LDOCR_LDOANAKEY

	orr	r9, r9, r10

	str	r9, [r7, #AT91_SFRBU_25LDOCR]

#endif

	.endm



	.text



	.arm
@@ -906,6 +929,9 @@ save_mck: 


	at91_plla_disable



	/* Enable low power mode for 2.5V regulator. */

	at91_2_5V_reg_set_low_power 1



	ldr	tmp3, .pm_mode

	cmp	tmp3, #AT91_PM_ULP1

	beq	ulp1_mode
@@ -918,6 +944,9 @@ ulp1_mode: 
	b	ulp_exit



ulp_exit:

	/* Disable low power mode for 2.5V regulator. */

	at91_2_5V_reg_set_low_power 0



	ldr	pmc, .pmc_base



	at91_plla_enable