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Date: Wed, 29 May 2019 13:42:35 +0800
From: JC Kuo <jckuo@...dia.com>
To: Sowjanya Komatineni <skomatineni@...dia.com>,
<thierry.reding@...il.com>, <jonathanh@...dia.com>,
<tglx@...utronix.de>, <jason@...edaemon.net>,
<marc.zyngier@....com>, <linus.walleij@...aro.org>,
<stefan@...er.ch>, <mark.rutland@....com>
CC: <pdeschrijver@...dia.com>, <pgaikwad@...dia.com>,
<sboyd@...nel.org>, <linux-clk@...r.kernel.org>,
<linux-gpio@...r.kernel.org>, <josephl@...dia.com>,
<talho@...dia.com>, <linux-tegra@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <mperttunen@...dia.com>,
<spatra@...dia.com>, <robh+dt@...nel.org>,
<devicetree@...r.kernel.org>
Subject: Re: [PATCH V2 09/12] soc/tegra: pmc: add pmc wake support for
tegra210
Hi Sowjanya,
usleep_range() in tegra210_pmc_irq_set_wake() should be replaced with
udelay() because caller irq_set_irq_wake() acquired spinlock and made
this context atomic.
Thanks,
JC
On 5/29/19 7:08 AM, Sowjanya Komatineni wrote:
> This patch implements PMC wakeup sequence for Tegra210 and defines
> common used wake events of RTC alarm and power key.
>
> Signed-off-by: Sowjanya Komatineni <skomatineni@...dia.com>
> ---
> drivers/soc/tegra/pmc.c | 113 ++++++++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 113 insertions(+)
>
> diff --git a/drivers/soc/tegra/pmc.c b/drivers/soc/tegra/pmc.c
> index 974b4c9f6ada..54dc8409e353 100644
> --- a/drivers/soc/tegra/pmc.c
> +++ b/drivers/soc/tegra/pmc.c
> @@ -57,6 +57,7 @@
> #include <dt-bindings/pinctrl/pinctrl-tegra-io-pad.h>
> #include <dt-bindings/gpio/tegra186-gpio.h>
> #include <dt-bindings/gpio/tegra194-gpio.h>
> +#include <dt-bindings/gpio/tegra-gpio.h>
>
> #define PMC_CNTRL 0x0
> #define PMC_CNTRL_INTR_POLARITY BIT(17) /* inverts INTR polarity */
> @@ -66,6 +67,12 @@
> #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)
> @@ -96,6 +103,11 @@
>
> #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)
> @@ -245,6 +257,7 @@ struct tegra_pmc_soc {
>
> const struct tegra_wake_event *wake_events;
> unsigned int num_wake_events;
> + unsigned int max_supported_wake_events;
> };
>
> static const char * const tegra186_reset_sources[] = {
> @@ -1917,6 +1930,54 @@ 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);
> + usleep_range(110, 120);
> +
> + value &= ~PMC_CNTRL_LATCH_WAKEUPS;
> + tegra_pmc_writel(pmc, value, PMC_CNTRL);
> + usleep_range(110, 120);
> +
> + tegra_pmc_writel(pmc, 0, PMC_SW_WAKE_STATUS);
> + if (pmc->soc->max_supported_wake_events > 32)
> + tegra_pmc_writel(pmc, 0, PMC_SW_WAKE2_STATUS);
> +
> + tegra_pmc_writel(pmc, 0, PMC_WAKE_STATUS);
> + if (pmc->soc->max_supported_wake_events > 32)
> + 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);
> +
> + 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);
> @@ -1948,6 +2009,48 @@ 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);
> +
> + 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);
> @@ -2535,6 +2638,11 @@ 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_GPIO("power", 24, 0, 189),
> + TEGRA_WAKE_IRQ("rtc", 16, 2),
> +};
> +
> static const struct tegra_pmc_soc tegra210_pmc_soc = {
> .num_powergates = ARRAY_SIZE(tegra210_powergates),
> .powergates = tegra210_powergates,
> @@ -2552,10 +2660,15 @@ 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,
> + .max_supported_wake_events = 64,
> };
>
> #define TEGRA186_IO_PAD_TABLE(_pad) \
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