diff options
| author | Claudiu Beznea <claudiu.beznea@microchip.com> | 2019-02-14 15:55:01 +0000 |
|---|---|---|
| committer | Ludovic Desroches <ludovic.desroches@microchip.com> | 2019-03-28 11:05:53 +0100 |
| commit | bc0779bd8f1317faddf65385f7af1f1fe229f23b (patch) | |
| tree | 04fa7e22d554f524e4f0c5f397ae55e28776f4f1 /arch/arm/mach-at91 | |
| parent | eaedc0d379da6d1157a4f274d186001d11615b2b (diff) | |
ARM: at91: pm: disable RC oscillator in ULP0
Disable RC oscillator in ULP0 as datasheet specifies.
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Diffstat (limited to 'arch/arm/mach-at91')
| -rw-r--r-- | arch/arm/mach-at91/pm_suspend.S | 39 |
1 files changed, 37 insertions, 2 deletions
diff --git a/arch/arm/mach-at91/pm_suspend.S b/arch/arm/mach-at91/pm_suspend.S index 8b18cad1dcf5..5c33023f9129 100644 --- a/arch/arm/mach-at91/pm_suspend.S +++ b/arch/arm/mach-at91/pm_suspend.S @@ -178,11 +178,46 @@ ENDPROC(at91_backup_mode) orr tmp1, tmp1, #AT91_PMC_KEY str tmp1, [pmc, #AT91_CKGR_MOR] + /* Save RC oscillator state */ + ldr tmp1, [pmc, #AT91_PMC_SR] + str tmp1, .saved_osc_status + tst tmp1, #AT91_PMC_MOSCRCS + bne 1f + + /* Turn off RC oscillator */ + ldr tmp1, [pmc, #AT91_CKGR_MOR] + bic tmp1, tmp1, #AT91_PMC_MOSCRCEN + bic tmp1, tmp1, #AT91_PMC_KEY_MASK + orr tmp1, tmp1, #AT91_PMC_KEY + str tmp1, [pmc, #AT91_CKGR_MOR] + + /* Wait main RC disabled done */ +2: ldr tmp1, [pmc, #AT91_PMC_SR] + tst tmp1, #AT91_PMC_MOSCRCS + bne 2b + /* Wait for interrupt */ - at91_cpu_idle +1: at91_cpu_idle - /* Turn on the crystal oscillator */ + /* Restore RC oscillator state */ + ldr tmp1, .saved_osc_status + tst tmp1, #AT91_PMC_MOSCRCS + beq 4f + + /* Turn on RC oscillator */ ldr tmp1, [pmc, #AT91_CKGR_MOR] + orr tmp1, tmp1, #AT91_PMC_MOSCRCEN + bic tmp1, tmp1, #AT91_PMC_KEY_MASK + orr tmp1, tmp1, #AT91_PMC_KEY + str tmp1, [pmc, #AT91_CKGR_MOR] + + /* Wait main RC stabilization */ +3: ldr tmp1, [pmc, #AT91_PMC_SR] + tst tmp1, #AT91_PMC_MOSCRCS + beq 3b + + /* Turn on the crystal oscillator */ +4: ldr tmp1, [pmc, #AT91_CKGR_MOR] orr tmp1, tmp1, #AT91_PMC_MOSCEN orr tmp1, tmp1, #AT91_PMC_KEY str tmp1, [pmc, #AT91_CKGR_MOR] |