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Date: Tue, 17 Jul 2018 13:49:31 +0300
From: Claudiu Beznea <Claudiu.Beznea@...rochip.com>
To: Alexandre Belloni <alexandre.belloni@...tlin.com>
CC: <sboyd@...nel.org>, <mturquette@...libre.com>,
<linux-kernel@...r.kernel.org>, <linux@...linux.org.uk>,
<linux-clk@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 4/4] ARM: at91: pm: configure wakeup sources for ULP1 mode
On 17.07.2018 13:45, Alexandre Belloni wrote:
> Hi,
>
> On 17/07/2018 11:26:57+0300, Claudiu Beznea wrote:
>> Since for ULP1 PM mode of SAMA5D2 the wakeup sources are limited and
>> well known add a method to check if these wakeup sources are defined by
>> user (either via DT or filesystem). In case there are no wakeup sources
>> defined for ULP1 the PM suspend will fail, otherwise these will be
>> configured in fast startup registers of PMC. Since wakeup sources of
>> ULP1 need also to be configured in SHDWC registers the code was a bit
>> changed to map the SHDWC also in case ULP1 is requested by user (this
>> was done in the initialization phase). In case the ULP1 initialization
>> fails the ULP0 mode is used (this mode was also used in case backup mode
>> initialization failed).
>>
>> Signed-off-by: Claudiu Beznea <claudiu.beznea@...rochip.com>
>> ---
>> arch/arm/mach-at91/pm.c | 165 +++++++++++++++++++++++++++++++++++++++++-------
>> 1 file changed, 143 insertions(+), 22 deletions(-)
>>
>> diff --git a/arch/arm/mach-at91/pm.c b/arch/arm/mach-at91/pm.c
>> index 099d8094018c..c8ef696b83b6 100644
>> --- a/arch/arm/mach-at91/pm.c
>> +++ b/arch/arm/mach-at91/pm.c
>> @@ -80,6 +80,87 @@ static struct at91_pm_bu {
>> phys_addr_t resume;
>> } *pm_bu;
>>
>> +struct wakeup_source_info {
>> + unsigned int pmc_fsmr_bit;
>> + unsigned int shdwc_mr_bit;
>> + bool set_polarity;
>> +};
>> +
>> +static const struct wakeup_source_info ws_info[] = {
>> + { .pmc_fsmr_bit = AT91_PMC_FSTT(10), .set_polarity = true },
>> + { .pmc_fsmr_bit = AT91_PMC_RTCAL, .shdwc_mr_bit = BIT(17) },
>> + { .pmc_fsmr_bit = AT91_PMC_USBAL },
>> + { .pmc_fsmr_bit = AT91_PMC_SDMMC_CD },
>> +};
>> +
>> +static const struct of_device_id sama5d2_ws_ids[] = {
>> + { .compatible = "atmel,sama5d2-gem", .data = &ws_info[0] },
>> + { .compatible = "atmel,at91rm9200-rtc", .data = &ws_info[1] },
>> + { .compatible = "atmel,sama5d3-udc", .data = &ws_info[2] },
>> + { .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,sama5d2-sdhci", .data = &ws_info[3] },
>> + { /* sentinel */ }
>> +};
>> +
>> +static int at91_pm_config_ws(unsigned int pm_mode, bool set)
>> +{
>> + const struct wakeup_source_info *wsi;
>> + const struct of_device_id *match;
>> + struct platform_device *pdev;
>> + struct device_node *np;
>> + unsigned int mode = 0, polarity = 0, val = 0;
>> +
>> + if (pm_mode != AT91_PM_ULP1)
>> + return 0;
>> +
>> + if (!pm_data.pmc || !pm_data.shdwc)
>> + return -EPERM;
>> +
>> + if (!set) {
>> + writel(mode, pm_data.pmc + AT91_PMC_FSMR);
>> + return 0;
>> + }
>> +
>> + /* SHDWC.WUIR */
>> + val = readl(pm_data.shdwc + 0x0c);
>> + mode |= (val & 0x3ff);
>> + polarity |= ((val >> 16) & 0x3ff);
>> +
>> + /* SHDWC.MR */
>> + val = readl(pm_data.shdwc + 0x04);
>> +
>> + /* Loop through defined wakeup sources. */
>> + for_each_matching_node_and_match(np, sama5d2_ws_ids, &match) {
>> + pdev = of_find_device_by_node(np);
>
> of_find_device_by_node takes a reference to the embedded struct
> device...
>
Yes, thank you!
>> + if (!pdev)
>> + continue;
>> +
>> + if (device_may_wakeup(&pdev->dev)) {
>> + wsi = match->data;
>> +
>> + /* Check if enabled on SHDWC. */
>> + if (wsi->shdwc_mr_bit && !(val & wsi->shdwc_mr_bit))
>> + continue;
>> +
>> + mode |= wsi->pmc_fsmr_bit;
>> + if (wsi->set_polarity)
>> + polarity |= wsi->pmc_fsmr_bit;
>> + }
>
> So you need to drop it here.
>
> Can you do that and resend, just that patch? thanks.
>
>> + }
>> +
>> + if (mode) {
>> + writel(mode, pm_data.pmc + AT91_PMC_FSMR);
>> + writel(polarity, pm_data.pmc + AT91_PMC_FSPR);
>> + } else {
>> + pr_err("AT91: PM: no ULP1 wakeup sources found!");
>> + }
>> +
>> + return mode ? 0 : -EPERM;
>> +}
>> +
>> /*
>> * Called after processes are frozen, but before we shutdown devices.
>> */
>> @@ -98,7 +179,7 @@ static int at91_pm_begin(suspend_state_t state)
>> pm_data.mode = -1;
>> }
>>
>> - return 0;
>> + return at91_pm_config_ws(pm_data.mode, true);
>> }
>>
>> /*
>> @@ -234,6 +315,7 @@ static int at91_pm_enter(suspend_state_t state)
>> */
>> static void at91_pm_end(void)
>> {
>> + at91_pm_config_ws(pm_data.mode, false);
>> }
>>
>>
>> @@ -479,31 +561,28 @@ static void __init at91_pm_sram_init(void)
>> &at91_pm_suspend_in_sram, at91_pm_suspend_in_sram_sz);
>> }
>>
>> -static void __init at91_pm_backup_init(void)
>> +static bool __init at91_is_pm_mode_active(int pm_mode)
>> +{
>> + return (pm_data.standby_mode == pm_mode ||
>> + pm_data.suspend_mode == pm_mode);
>> +}
>> +
>> +static int __init at91_pm_backup_init(void)
>> {
>> struct gen_pool *sram_pool;
>> struct device_node *np;
>> struct platform_device *pdev = NULL;
>> + int ret = -ENODEV;
>>
>> - if ((pm_data.standby_mode != AT91_PM_BACKUP) &&
>> - (pm_data.suspend_mode != AT91_PM_BACKUP))
>> - return;
>> + if (!at91_is_pm_mode_active(AT91_PM_BACKUP))
>> + return 0;
>>
>> pm_bu = NULL;
>>
>> - np = of_find_compatible_node(NULL, NULL, "atmel,sama5d2-shdwc");
>> - if (!np) {
>> - pr_warn("%s: failed to find shdwc!\n", __func__);
>> - return;
>> - }
>> -
>> - pm_data.shdwc = of_iomap(np, 0);
>> - of_node_put(np);
>> -
>> np = of_find_compatible_node(NULL, NULL, "atmel,sama5d2-sfrbu");
>> if (!np) {
>> pr_warn("%s: failed to find sfrbu!\n", __func__);
>> - goto sfrbu_fail;
>> + return ret;
>> }
>>
>> pm_data.sfrbu = of_iomap(np, 0);
>> @@ -530,6 +609,7 @@ static void __init at91_pm_backup_init(void)
>> pm_bu = (void *)gen_pool_alloc(sram_pool, sizeof(struct at91_pm_bu));
>> if (!pm_bu) {
>> pr_warn("%s: unable to alloc securam!\n", __func__);
>> + ret = -ENOMEM;
>> goto securam_fail;
>> }
>>
>> @@ -537,21 +617,62 @@ static void __init at91_pm_backup_init(void)
>> pm_bu->canary = __pa_symbol(&canary);
>> pm_bu->resume = __pa_symbol(cpu_resume);
>>
>> - return;
>> + return 0;
>>
>> -sfrbu_fail:
>> - iounmap(pm_data.shdwc);
>> - pm_data.shdwc = NULL;
>> securam_fail:
>> iounmap(pm_data.sfrbu);
>> pm_data.sfrbu = NULL;
>> + return ret;
>> +}
>>
>> - if (pm_data.standby_mode == AT91_PM_BACKUP)
>> +static void __init at91_pm_use_default_mode(int pm_mode)
>> +{
>> + if (pm_mode != AT91_PM_ULP1 && pm_mode != AT91_PM_BACKUP)
>> + return;
>> +
>> + if (pm_data.standby_mode == pm_mode)
>> pm_data.standby_mode = AT91_PM_ULP0;
>> - if (pm_data.suspend_mode == AT91_PM_BACKUP)
>> + if (pm_data.suspend_mode == pm_mode)
>> pm_data.suspend_mode = AT91_PM_ULP0;
>> }
>>
>> +static void __init at91_pm_modes_init(void)
>> +{
>> + struct device_node *np;
>> + int ret;
>> +
>> + if (!at91_is_pm_mode_active(AT91_PM_BACKUP) &&
>> + !at91_is_pm_mode_active(AT91_PM_ULP1))
>> + return;
>> +
>> + np = of_find_compatible_node(NULL, NULL, "atmel,sama5d2-shdwc");
>> + if (!np) {
>> + pr_warn("%s: failed to find shdwc!\n", __func__);
>> + goto ulp1_default;
>> + }
>> +
>> + pm_data.shdwc = of_iomap(np, 0);
>> + of_node_put(np);
>> +
>> + ret = at91_pm_backup_init();
>> + if (ret) {
>> + if (!at91_is_pm_mode_active(AT91_PM_ULP1))
>> + goto unmap;
>> + else
>> + goto backup_default;
>> + }
>> +
>> + return;
>> +
>> +unmap:
>> + iounmap(pm_data.shdwc);
>> + pm_data.shdwc = NULL;
>> +ulp1_default:
>> + at91_pm_use_default_mode(AT91_PM_ULP1);
>> +backup_default:
>> + at91_pm_use_default_mode(AT91_PM_BACKUP);
>> +}
>> +
>> struct pmc_info {
>> unsigned long uhp_udp_mask;
>> };
>> @@ -645,7 +766,7 @@ void __init sama5d2_pm_init(void)
>> if (!IS_ENABLED(CONFIG_SOC_SAMA5D2))
>> return;
>>
>> - at91_pm_backup_init();
>> + at91_pm_modes_init();
>> sama5_pm_init();
>> }
>>
>> --
>> 2.7.4
>>
>
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