diff options
| author | Claudiu Beznea <claudiu.beznea@microchip.com> | 2021-04-15 13:50:00 +0300 |
|---|---|---|
| committer | Nicolas Ferre <nicolas.ferre@microchip.com> | 2021-07-19 14:32:12 +0200 |
| commit | 475be50fc149ae11822433e8cb511493bb0e5c1d (patch) | |
| tree | 78754b7d1be001e4c915d4b18c478b37dc751253 /arch/arm/mach-at91 | |
| parent | 28eb1d40fe57fd03657f01fdaf2cce115cba3b7d (diff) | |
| download | linux-475be50fc149ae11822433e8cb511493bb0e5c1d.tar.bz2 | |
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: Claudiu Beznea <claudiu.beznea@microchip.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Link: https://lore.kernel.org/r/20210415105010.569620-15-claudiu.beznea@microchip.com
Diffstat (limited to 'arch/arm/mach-at91')
| -rw-r--r-- | arch/arm/mach-at91/pm.h | 1 | ||||
| -rw-r--r-- | arch/arm/mach-at91/pm_suspend.S | 29 |
2 files changed, 30 insertions, 0 deletions
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 |