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Subject[PATCH V6 16/21] soc/tegra: pmc: Add pmc wake support for tegra210
Date
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);
+
+ value &= ~PMC_CNTRL_LATCH_WAKEUPS;
+ tegra_pmc_writel(pmc, value, PMC_CNTRL);
+ udelay(120);
+
+ 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);
+
+ 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);
+
+ 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) \
--
2.7.4
\
 
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