soc/tegra: pmc: Add wake event support on Tegra210

This patch implements PMC wakeup sequence for Tegra210 and defines the
commonly used RTC alarm wake event.

Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

diff --git a/drivers/soc/tegra/pmc.c b/drivers/soc/tegra/pmc.c
index 63e26bbaf5762b9f74d61778bb80328cb25946d8..e1f14098bd2d474e721d5b50ad740fe939df88a9 100644 (file)
--- a/drivers/soc/tegra/pmc.c
+++ b/drivers/soc/tegra/pmc.c
@@ -58,6 +58,11 @@
 #define  PMC_CNTRL_SYSCLK_POLARITY     BIT(10) /* sys clk polarity */
 #define  PMC_CNTRL_MAIN_RST            BIT(4)
 
+#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)
 #define  DPD_SAMPLE_DISABLE            (0 << 0)
@@ -87,6 +92,11 @@
 
 #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)
@@ -1948,6 +1958,86 @@ 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;
+
+       /* clear wake status */
+       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 |= BIT(bit);
+       else
+               value &= ~BIT(bit);
+
+       tegra_pmc_writel(pmc, value, offset);
+
+       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 |= BIT(bit);
+               break;
+
+       case IRQ_TYPE_EDGE_FALLING:
+       case IRQ_TYPE_LEVEL_LOW:
+               value &= ~BIT(bit);
+               break;
+
+       case IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING:
+               value ^= BIT(bit);
+               break;
+
+       default:
+               return -EINVAL;
+       }
+
+       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);
@@ -2566,6 +2656,10 @@ 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,
@@ -2583,10 +2677,14 @@ 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)                                         \