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SubjectRe: [PATCH V6 16/21] soc/tegra: pmc: Add pmc wake support for tegra210
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21.07.2019 22:40, Sowjanya Komatineni пишет:
> This patch implements PMC wakeup sequence for Tegra210 and defines
> common used RTC alarm wake event.
>
> Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
> ---
> drivers/soc/tegra/pmc.c | 111 ++++++++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 111 insertions(+)
>
> diff --git a/drivers/soc/tegra/pmc.c b/drivers/soc/tegra/pmc.c
> index 91c84d0e66ae..c556f38874e1 100644
> --- a/drivers/soc/tegra/pmc.c
> +++ b/drivers/soc/tegra/pmc.c
> @@ -57,6 +57,12 @@
> #define PMC_CNTRL_SYSCLK_OE BIT(11) /* system clock enable */
> #define PMC_CNTRL_SYSCLK_POLARITY BIT(10) /* sys clk polarity */
> #define PMC_CNTRL_MAIN_RST BIT(4)
> +#define PMC_CNTRL_LATCH_WAKEUPS BIT(5)
> +
> +#define PMC_WAKE_MASK 0x0c
> +#define PMC_WAKE_LEVEL 0x10
> +#define PMC_WAKE_STATUS 0x14
> +#define PMC_SW_WAKE_STATUS 0x18
>
> #define DPD_SAMPLE 0x020
> #define DPD_SAMPLE_ENABLE BIT(0)
> @@ -87,6 +93,11 @@
>
> #define PMC_SCRATCH41 0x140
>
> +#define PMC_WAKE2_MASK 0x160
> +#define PMC_WAKE2_LEVEL 0x164
> +#define PMC_WAKE2_STATUS 0x168
> +#define PMC_SW_WAKE2_STATUS 0x16c
> +
> #define PMC_SENSOR_CTRL 0x1b0
> #define PMC_SENSOR_CTRL_SCRATCH_WRITE BIT(2)
> #define PMC_SENSOR_CTRL_ENABLE_RST BIT(1)
> @@ -1922,6 +1933,55 @@ static const struct irq_domain_ops tegra_pmc_irq_domain_ops = {
> .alloc = tegra_pmc_irq_alloc,
> };
>
> +static int tegra210_pmc_irq_set_wake(struct irq_data *data, unsigned int on)
> +{
> + struct tegra_pmc *pmc = irq_data_get_irq_chip_data(data);
> + unsigned int offset, bit;
> + u32 value;
> +
> + if (data->hwirq == ULONG_MAX)
> + return 0;
> +
> + offset = data->hwirq / 32;
> + bit = data->hwirq % 32;
> +
> + /*
> + * Latch wakeups to SW_WAKE_STATUS register to capture events
> + * that would not make it into wakeup event register during LP0 exit.
> + */
> + value = tegra_pmc_readl(pmc, PMC_CNTRL);
> + value |= PMC_CNTRL_LATCH_WAKEUPS;
> + tegra_pmc_writel(pmc, value, PMC_CNTRL);
> + udelay(120);

Why it takes so much time to latch the values? Shouldn't some status-bit
be polled for the completion of latching?

Is this register-write really getting buffered in the PMC?

> + value &= ~PMC_CNTRL_LATCH_WAKEUPS;
> + tegra_pmc_writel(pmc, value, PMC_CNTRL);
> + udelay(120);

120 usecs to remove latching, really?

> + tegra_pmc_writel(pmc, 0, PMC_SW_WAKE_STATUS);
> + tegra_pmc_writel(pmc, 0, PMC_SW_WAKE2_STATUS);
> +
> + tegra_pmc_writel(pmc, 0, PMC_WAKE_STATUS);
> + tegra_pmc_writel(pmc, 0, PMC_WAKE2_STATUS);
> +
> + /* enable PMC wake */
> + if (data->hwirq >= 32)
> + offset = PMC_WAKE2_MASK;
> + else
> + offset = PMC_WAKE_MASK;
> +
> + value = tegra_pmc_readl(pmc, offset);
> +
> + if (on)
> + value |= 1 << bit;
> + else
> + value &= ~(1 << bit);
> +
> + tegra_pmc_writel(pmc, value, offset);

Why the latching is done *before* writing into the WAKE registers? What
it is latching then?

> + return 0;
> +}
> +
> static int tegra186_pmc_irq_set_wake(struct irq_data *data, unsigned int on)
> {
> struct tegra_pmc *pmc = irq_data_get_irq_chip_data(data);
> @@ -1954,6 +2014,49 @@ static int tegra186_pmc_irq_set_wake(struct irq_data *data, unsigned int on)
> return 0;
> }
>
> +static int tegra210_pmc_irq_set_type(struct irq_data *data, unsigned int type)
> +{
> + struct tegra_pmc *pmc = irq_data_get_irq_chip_data(data);
> + unsigned int offset, bit;
> + u32 value;
> +
> + if (data->hwirq == ULONG_MAX)
> + return 0;
> +
> + offset = data->hwirq / 32;
> + bit = data->hwirq % 32;
> +
> + if (data->hwirq >= 32)
> + offset = PMC_WAKE2_LEVEL;
> + else
> + offset = PMC_WAKE_LEVEL;
> +
> + value = tegra_pmc_readl(pmc, offset);
> +
> + switch (type) {
> + case IRQ_TYPE_EDGE_RISING:
> + case IRQ_TYPE_LEVEL_HIGH:
> + value |= 1 << bit;
> + break;
> +
> + case IRQ_TYPE_EDGE_FALLING:
> + case IRQ_TYPE_LEVEL_LOW:
> + value &= ~(1 << bit);
> + break;
> +
> + case IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING:
> + value ^= 1 << bit;
> + break;
> +
> + default:
> + return -EINVAL;
> + }
> +
> + tegra_pmc_writel(pmc, value, offset);

Shouldn't the WAKE_LEVEL be latched as well?

> + return 0;
> +}
> +
> static int tegra186_pmc_irq_set_type(struct irq_data *data, unsigned int type)
> {
> struct tegra_pmc *pmc = irq_data_get_irq_chip_data(data);
> @@ -2540,6 +2643,10 @@ static const struct pinctrl_pin_desc tegra210_pin_descs[] = {
> TEGRA210_IO_PAD_TABLE(TEGRA_IO_PIN_DESC)
> };
>
> +static const struct tegra_wake_event tegra210_wake_events[] = {
> + TEGRA_WAKE_IRQ("rtc", 16, 2),
> +};
> +
> static const struct tegra_pmc_soc tegra210_pmc_soc = {
> .num_powergates = ARRAY_SIZE(tegra210_powergates),
> .powergates = tegra210_powergates,
> @@ -2557,10 +2664,14 @@ static const struct tegra_pmc_soc tegra210_pmc_soc = {
> .regs = &tegra20_pmc_regs,
> .init = tegra20_pmc_init,
> .setup_irq_polarity = tegra20_pmc_setup_irq_polarity,
> + .irq_set_wake = tegra210_pmc_irq_set_wake,
> + .irq_set_type = tegra210_pmc_irq_set_type,
> .reset_sources = tegra210_reset_sources,
> .num_reset_sources = ARRAY_SIZE(tegra210_reset_sources),
> .reset_levels = NULL,
> .num_reset_levels = 0,
> + .num_wake_events = ARRAY_SIZE(tegra210_wake_events),
> + .wake_events = tegra210_wake_events,
> };
>
> #define TEGRA186_IO_PAD_TABLE(_pad) \
>

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