From: Claudiu Beznea <claudiu.beznea@microchip.com>
To: <nicolas.ferre@microchip.com>, <alexandre.belloni@bootlin.com>,
<ludovic.desroches@microchip.com>, <robh+dt@kernel.org>,
<linux@armlinux.org.uk>
Cc: <linux-arm-kernel@lists.infradead.org>,
<devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
Claudiu Beznea <claudiu.beznea@microchip.com>
Subject: [PATCH 14/24] ARM: at91: pm: add support for 2.5V LDO regulator control
Date: Wed, 31 Mar 2021 13:58:58 +0300 [thread overview]
Message-ID: <20210331105908.23027-15-claudiu.beznea@microchip.com> (raw)
In-Reply-To: <20210331105908.23027-1-claudiu.beznea@microchip.com>
Add support to disable/enable 2.5V LDO regulator when entering/exiting
any ULP mode.
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
---
arch/arm/mach-at91/pm.h | 1 +
arch/arm/mach-at91/pm_suspend.S | 29 +++++++++++++++++++++++++++++
2 files changed, 30 insertions(+)
diff --git a/arch/arm/mach-at91/pm.h b/arch/arm/mach-at91/pm.h
index 666474088d55..53bdc9000e44 100644
--- a/arch/arm/mach-at91/pm.h
+++ b/arch/arm/mach-at91/pm.h
@@ -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
diff --git a/arch/arm/mach-at91/pm_suspend.S b/arch/arm/mach-at91/pm_suspend.S
index 8b0b8619ee8a..9c9e08fd8300 100644
--- a/arch/arm/mach-at91/pm_suspend.S
+++ b/arch/arm/mach-at91/pm_suspend.S
@@ -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
--
2.25.1
next prev parent reply other threads:[~2021-03-31 11:00 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-31 10:58 [PATCH 00/24] ARM: at91: pm: add support for sama7g5 Claudiu Beznea
2021-03-31 10:58 ` [PATCH 01/24] ARM: at91: pm: move pm_bu to soc_pm data structure Claudiu Beznea
2021-03-31 14:44 ` Alexandre Belloni
2021-03-31 10:58 ` [PATCH 02/24] ARM: at91: pm: move the setup of soc_pm.bu->suspended Claudiu Beznea
2021-03-31 10:58 ` [PATCH 03/24] ARM: at91: pm: document at91_soc_pm structure Claudiu Beznea
2021-03-31 10:58 ` [PATCH 04/24] ARM: at91: pm: check for different controllers in at91_pm_modes_init() Claudiu Beznea
2021-03-31 10:58 ` [PATCH 05/24] ARM: at91: pm: do not initialize pdev Claudiu Beznea
2021-03-31 10:58 ` [PATCH 06/24] ARM: at91: pm: use r7 instead of tmp1 Claudiu Beznea
2021-03-31 10:58 ` [PATCH 07/24] ARM: at91: pm: avoid push and pop on stack while memory is in self-refersh Claudiu Beznea
2021-03-31 10:58 ` [PATCH 08/24] ARM: at91: pm: s/CONFIG_SOC_SAM9X60/CONFIG_HAVE_AT91_SAM9X60_PLL/g Claudiu Beznea
2021-03-31 10:58 ` [PATCH 09/24] ARM: at91: pm: add support for waiting MCK1..4 Claudiu Beznea
2021-03-31 10:58 ` [PATCH 10/24] ARM: at91: sfrbu: add sfrbu registers definitions for sama7g5 Claudiu Beznea
2021-03-31 15:54 ` Alexandre Belloni
2021-04-01 9:34 ` Claudiu.Beznea
2021-03-31 10:58 ` [PATCH 11/24] ARM: at91: ddr: add registers definitions for sama7g5's ddr Claudiu Beznea
2021-03-31 10:58 ` [PATCH 12/24] ARM: at91: pm: add self-refresh support for sama7g5 Claudiu Beznea
2021-03-31 10:58 ` [PATCH 13/24] ARM: at91: pm: add support for MCK1..4 save/restore for ulp modes Claudiu Beznea
2021-03-31 10:58 ` Claudiu Beznea [this message]
2021-03-31 10:58 ` [PATCH 15/24] ARM: at91: pm: wait for ddr power mode off Claudiu Beznea
2021-03-31 10:59 ` [PATCH 16/24] dt-bindings: atmel-sysreg: add bindings for sama7g5 Claudiu Beznea
2021-03-31 10:59 ` [PATCH 17/24] ARM: at91: pm: add sama7g5 ddr controller Claudiu Beznea
2021-03-31 10:59 ` [PATCH 18/24] ARM: at91: pm: add sama7g5 ddr phy controller Claudiu Beznea
2021-03-31 10:59 ` [PATCH 19/24] ARM: at91: pm: save ddr phy calibration data to securam Claudiu Beznea
2021-03-31 10:59 ` [PATCH 20/24] ARM: at91: pm: add backup mode support for SAMA7G5 Claudiu Beznea
2021-03-31 10:59 ` [PATCH 21/24] ARM: at91: pm: add sama7g5's pmc Claudiu Beznea
2021-03-31 10:59 ` [PATCH 22/24] ARM: at91: sama7: introduce sama7 SoC family Claudiu Beznea
2021-03-31 16:01 ` Alexandre Belloni
2021-04-01 9:38 ` Claudiu.Beznea
2021-04-01 10:24 ` Claudiu.Beznea
2021-04-08 15:24 ` Nicolas Ferre
2021-04-08 17:44 ` Alexandre Belloni
2021-04-08 15:30 ` Nicolas Ferre
2021-03-31 10:59 ` [PATCH 23/24] ARM: at91: pm: add pm support for SAMA7G5 Claudiu Beznea
2021-03-31 10:59 ` [PATCH 24/24] ARM: at91: pm: add sama7g5 shdwc Claudiu Beznea
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