2022-02-04 13:57:50 +00:00
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From 62be32b56ff31b2cd048a53fac40a165c5bc66cd Mon Sep 17 00:00:00 2001
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From: Claudiu Beznea <claudiu.beznea@microchip.com>
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Date: Thu, 15 Apr 2021 13:50:06 +0300
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Subject: [PATCH 215/247] ARM: at91: pm: add backup mode support for SAMA7G5
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Adapt at91_pm_backup_init() to work for SAMA7G5. Also, set the LPM pin
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to shutdown controller. This will signal to PMIC that it needs to switch
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to the state corresponding to backup mode.
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Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
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Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com>
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Link: https://lore.kernel.org/r/20210415105010.569620-21-claudiu.beznea@microchip.com
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---
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arch/arm/mach-at91/pm.c | 3 ++-
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arch/arm/mach-at91/pm_suspend.S | 7 +++++++
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2 files changed, 9 insertions(+), 1 deletion(-)
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--- a/arch/arm/mach-at91/pm.c
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+++ b/arch/arm/mach-at91/pm.c
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2022-03-02 13:11:44 +00:00
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@@ -744,7 +744,8 @@ static int __init at91_pm_backup_init(vo
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2022-02-04 13:57:50 +00:00
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struct platform_device *pdev;
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int ret = -ENODEV, located = 0;
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- if (!IS_ENABLED(CONFIG_SOC_SAMA5D2))
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+ if (!IS_ENABLED(CONFIG_SOC_SAMA5D2) &&
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+ !IS_ENABLED(CONFIG_SOC_SAMA7G5))
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return -EPERM;
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if (!at91_is_pm_mode_active(AT91_PM_BACKUP))
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--- a/arch/arm/mach-at91/pm_suspend.S
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+++ b/arch/arm/mach-at91/pm_suspend.S
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@@ -106,6 +106,12 @@ lp_done_\ena:
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#endif
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.endm
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+ .macro at91_backup_set_lpm reg
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+#ifdef CONFIG_SOC_SAMA7
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+ orr \reg, \reg, #0x200000
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+#endif
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+ .endm
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+
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.text
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.arm
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@@ -989,6 +995,7 @@ ulp_exit:
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ldr r0, .shdwc
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mov tmp1, #0xA5000000
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add tmp1, tmp1, #0x1
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+ at91_backup_set_lpm tmp1
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str tmp1, [r0, #0]
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.endm
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