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ARM: at91: pm: add ULP1 support for SAM9X60 

Add ULP1 support for SAM9X60. In pm_suspend.S enable RC oscillator in
PMC if it is not enabled. At resume the state before suspend is
restored.

Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Acked-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Ludovic Desroches <ludovic.desroches@microchip.com>
hifive-unleashed-5.2
Claudiu Beznea 2019-02-14 15:54:57 +00:00 committed by Ludovic Desroches
parent a958156dac
commit eaedc0d379
3 changed files with 65 additions and 1 deletions
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24
arch/arm/mach-at91/pm.c
View File

@ -100,6 +100,8 @@ static const struct wakeup_source_info ws_info[] = {
{ .pmc_fsmr_bit = AT91_PMC_RTCAL, .shdwc_mr_bit = BIT(17) },
{ .pmc_fsmr_bit = AT91_PMC_USBAL },
{ .pmc_fsmr_bit = AT91_PMC_SDMMC_CD },
{ .pmc_fsmr_bit = AT91_PMC_RTTAL },
{ .pmc_fsmr_bit = AT91_PMC_RXLP_MCE },
};
static const struct of_device_id sama5d2_ws_ids[] = {
@ -114,6 +116,17 @@ static const struct of_device_id sama5d2_ws_ids[] = {
{ /* sentinel */ }
};
static const struct of_device_id sam9x60_ws_ids[] = {
{ .compatible = "atmel,at91sam9x5-rtc", .data = &ws_info[1] },
{ .compatible = "atmel,at91rm9200-ohci", .data = &ws_info[2] },
{ .compatible = "usb-ohci", .data = &ws_info[2] },
{ .compatible = "atmel,at91sam9g45-ehci", .data = &ws_info[2] },
{ .compatible = "usb-ehci", .data = &ws_info[2] },
{ .compatible = "atmel,at91sam9260-rtt", .data = &ws_info[4] },
{ .compatible = "cdns,sam9x60-macb", .data = &ws_info[5] },
{ /* sentinel */ }
};
static int at91_pm_config_ws(unsigned int pm_mode, bool set)
{
const struct wakeup_source_info *wsi;
@ -192,6 +205,13 @@ static int at91_sama5d2_config_pmc_ws(void __iomem *pmc, u32 mode, u32 polarity)
return 0;
}
static int at91_sam9x60_config_pmc_ws(void __iomem *pmc, u32 mode, u32 polarity)
{
writel(mode, pmc + AT91_PMC_FSMR);
return 0;
}
/*
* Called after processes are frozen, but before we shutdown devices.
*/
@ -789,8 +809,12 @@ void __init sam9x60_pm_init(void)
if (!IS_ENABLED(CONFIG_SOC_AT91SAM9))
return;
at91_pm_modes_init();
at91_dt_ramc();
at91_pm_init(at91sam9x60_idle);
soc_pm.ws_ids = sam9x60_ws_ids;
soc_pm.config_pmc_ws = at91_sam9x60_config_pmc_ws;
}
void __init at91sam9_pm_init(void)

41
arch/arm/mach-at91/pm_suspend.S
View File

@ -197,8 +197,26 @@ ENDPROC(at91_backup_mode)
.macro at91_pm_ulp1_mode
ldr pmc, .pmc_base
/* Switch the main clock source to 12-MHz RC oscillator */
/* Save RC oscillator state and check if it is enabled. */
ldr tmp1, [pmc, #AT91_PMC_SR]
str tmp1, .saved_osc_status
tst tmp1, #AT91_PMC_MOSCRCS
bne 2f
/* Enable 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 */
1: ldr tmp1, [pmc, #AT91_PMC_SR]
tst tmp1, #AT91_PMC_MOSCRCS
beq 1b
/* Switch the main clock source to 12-MHz RC oscillator */
2: ldr tmp1, [pmc, #AT91_CKGR_MOR]
bic tmp1, tmp1, #AT91_PMC_MOSCSEL
bic tmp1, tmp1, #AT91_PMC_KEY_MASK
orr tmp1, tmp1, #AT91_PMC_KEY
@ -262,6 +280,25 @@ ENDPROC(at91_backup_mode)
str tmp1, [pmc, #AT91_PMC_MCKR]
wait_mckrdy
/* Restore RC oscillator state */
ldr tmp1, .saved_osc_status
tst tmp1, #AT91_PMC_MOSCRCS
bne 3f
/* Disable 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 RC oscillator disable done */
4: ldr tmp1, [pmc, #AT91_PMC_SR]
tst tmp1, #AT91_PMC_MOSCRCS
bne 4b
3:
.endm
ENTRY(at91_ulp_mode)
@ -475,6 +512,8 @@ ENDPROC(at91_sramc_self_refresh)
.word 0
.saved_sam9_mdr1:
.word 0
.saved_osc_status:
.word 0
ENTRY(at91_pm_suspend_in_sram_sz)
.word .-at91_pm_suspend_in_sram

1
include/linux/clk/at91_pmc.h
View File

@ -159,6 +159,7 @@
#define AT91_PMC_FSMR 0x70 /* Fast Startup Mode Register */
#define AT91_PMC_FSTT(n) BIT(n)
#define AT91_PMC_RTTAL BIT(16)
#define AT91_PMC_RTCAL BIT(17) /* RTC Alarm Enable */
#define AT91_PMC_USBAL BIT(18) /* USB Resume Enable */
#define AT91_PMC_SDMMC_CD BIT(19) /* SDMMC Card Detect Enable */