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Subject[PATCH V1 09/12] soc/tegra: pmc: add pmc wake support for tegra210
Date
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@nvidia.com>
---
drivers/soc/tegra/pmc.c | 120 ++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 120 insertions(+)

diff --git a/drivers/soc/tegra/pmc.c b/drivers/soc/tegra/pmc.c
index f77ce4b827e3..5e68e1de1780 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)
@@ -1917,6 +1929,65 @@ static const struct irq_domain_ops tegra_pmc_irq_domain_ops = {
.alloc = tegra_pmc_irq_alloc,
};

+static inline void clear_pmc_sw_wake_status(void)
+{
+ tegra_pmc_writel(pmc, 0, PMC_SW_WAKE_STATUS);
+ if (tegra_get_chip_id() != TEGRA20)
+ tegra_pmc_writel(pmc, 0, PMC_SW_WAKE2_STATUS);
+}
+
+static inline void clear_pmc_wake_status(void)
+{
+ u32 reg;
+
+ reg = tegra_pmc_readl(pmc, PMC_WAKE_STATUS);
+ if (reg)
+ tegra_pmc_writel(pmc, reg, PMC_WAKE_STATUS);
+ if (tegra_get_chip_id() != TEGRA20) {
+ reg = tegra_pmc_readl(pmc, PMC_WAKE2_STATUS);
+ if (reg)
+ tegra_pmc_writel(pmc, reg, PMC_WAKE2_STATUS);
+ }
+}
+
+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 pmc_wake_mask_reg;
+ u32 value;
+
+ if (data->hwirq < 0)
+ return 0;
+
+ offset = data->hwirq / 32;
+ bit = data->hwirq % 32;
+
+ clear_pmc_sw_wake_status();
+
+ /* enable PMC wake */
+ 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);
+
+ clear_pmc_wake_status();
+
+ pmc_wake_mask_reg = (offset) ? PMC_WAKE2_MASK : PMC_WAKE_MASK;
+ value = tegra_pmc_readl(pmc, pmc_wake_mask_reg);
+ if (on)
+ value |= 1 << bit;
+ else
+ value &= ~(1 << bit);
+ tegra_pmc_writel(pmc, value, pmc_wake_mask_reg);
+
+ 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 +2019,46 @@ 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 pmc_wake_lvl_reg;
+ u32 value;
+
+ if (data->hwirq < 0)
+ return 0;
+
+ offset = data->hwirq / 32;
+ bit = data->hwirq % 32;
+
+ pmc_wake_lvl_reg = (offset) ? PMC_WAKE2_LEVEL : PMC_WAKE_LEVEL;
+ value = tegra_pmc_readl(pmc, pmc_wake_lvl_reg);
+
+ 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, pmc_wake_lvl_reg);
+
+ 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 +2646,11 @@ 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_GPIO(X, 5)*/
+ 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 +2668,14 @@ 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,
+ .pmc_irq_set_wake = tegra210_pmc_irq_set_wake,
+ .pmc_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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