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Subject[PATCH v1 09/12] thermal: tegra: add support for EDP IRQ
Date
Add support to generate OC (over-current) interrupts to
indicate the OC event and print out alarm messages.

Signed-off-by: Wei Ni <wni@nvidia.com>
---
drivers/thermal/tegra/soctherm.c | 420 +++++++++++++++++++++++++++++++++++++++
1 file changed, 420 insertions(+)

diff --git a/drivers/thermal/tegra/soctherm.c b/drivers/thermal/tegra/soctherm.c
index eefbb29b3b7d..37108f2290f9 100644
--- a/drivers/thermal/tegra/soctherm.c
+++ b/drivers/thermal/tegra/soctherm.c
@@ -23,6 +23,8 @@
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/irqdomain.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
@@ -104,6 +106,16 @@
#define STATS_CTL_CLR_UP 0x2
#define STATS_CTL_EN_UP 0x1

+#define OC_INTR_STATUS 0x39c
+#define OC_INTR_ENABLE 0x3a0
+#define OC_INTR_DISABLE 0x3a4
+
+#define OC_INTR_OC1_MASK BIT(0)
+#define OC_INTR_OC2_MASK BIT(1)
+#define OC_INTR_OC3_MASK BIT(2)
+#define OC_INTR_OC4_MASK BIT(3)
+#define OC_INTR_OC5_MASK BIT(4)
+
#define THROT_GLOBAL_CFG 0x400
#define THROT_GLOBAL_ENB_MASK BIT(0)

@@ -212,9 +224,23 @@ static const int max_high_temp = 127000;
enum soctherm_throttle_id {
THROTTLE_LIGHT = 0,
THROTTLE_HEAVY,
+ THROTTLE_OC1,
+ THROTTLE_OC2,
+ THROTTLE_OC3,
+ THROTTLE_OC4,
+ THROTTLE_OC5, /* OC5 is reserved */
THROTTLE_SIZE,
};

+enum soctherm_oc_irq_id {
+ TEGRA_SOC_OC_IRQ_1,
+ TEGRA_SOC_OC_IRQ_2,
+ TEGRA_SOC_OC_IRQ_3,
+ TEGRA_SOC_OC_IRQ_4,
+ TEGRA_SOC_OC_IRQ_5,
+ TEGRA_SOC_OC_IRQ_MAX,
+};
+
enum soctherm_throttle_dev_id {
THROTTLE_DEV_CPU = 0,
THROTTLE_DEV_GPU,
@@ -224,6 +250,11 @@ enum soctherm_throttle_dev_id {
static const char *const throt_names[] = {
[THROTTLE_LIGHT] = "light",
[THROTTLE_HEAVY] = "heavy",
+ [THROTTLE_OC1] = "oc1",
+ [THROTTLE_OC2] = "oc2",
+ [THROTTLE_OC3] = "oc3",
+ [THROTTLE_OC4] = "oc4",
+ [THROTTLE_OC5] = "oc5",
};

struct tegra_soctherm;
@@ -255,6 +286,7 @@ struct tegra_soctherm {
void __iomem *ccroc_regs;

int thermal_irq;
+ int edp_irq;

u32 *calib;
struct thermal_zone_device **thermctl_tzs;
@@ -267,6 +299,15 @@ struct tegra_soctherm {
struct mutex thermctl_lock;
};

+struct soctherm_oc_irq_chip_data {
+ struct mutex irq_lock; /* serialize OC IRQs */
+ struct irq_chip irq_chip;
+ struct irq_domain *domain;
+ int irq_enable;
+};
+
+static struct soctherm_oc_irq_chip_data soc_irq_cdata;
+
/**
* ccroc_writel() - writes a value to a CCROC register
* @ts: pointer to a struct tegra_soctherm
@@ -807,6 +848,360 @@ static irqreturn_t soctherm_thermal_isr_thread(int irq, void *dev_id)
return IRQ_HANDLED;
}

+/**
+ * soctherm_oc_intr_enable() - Enables the soctherm over-current interrupt
+ * @alarm: The soctherm throttle id
+ * @enable: Flag indicating enable the soctherm over-current
+ * interrupt or disable it
+ *
+ * Enables a specific over-current pins @alarm to raise an interrupt if the flag
+ * is set and the alarm corresponds to OC1, OC2, OC3, or OC4.
+ */
+static void soctherm_oc_intr_enable(struct tegra_soctherm *ts,
+ enum soctherm_throttle_id alarm,
+ bool enable)
+{
+ u32 r;
+
+ if (!enable)
+ return;
+
+ r = readl(ts->regs + OC_INTR_ENABLE);
+ switch (alarm) {
+ case THROTTLE_OC1:
+ r = REG_SET_MASK(r, OC_INTR_OC1_MASK, 1);
+ break;
+ case THROTTLE_OC2:
+ r = REG_SET_MASK(r, OC_INTR_OC2_MASK, 1);
+ break;
+ case THROTTLE_OC3:
+ r = REG_SET_MASK(r, OC_INTR_OC3_MASK, 1);
+ break;
+ case THROTTLE_OC4:
+ r = REG_SET_MASK(r, OC_INTR_OC4_MASK, 1);
+ break;
+ default:
+ r = 0;
+ break;
+ }
+ writel(r, ts->regs + OC_INTR_ENABLE);
+}
+
+/**
+ * soctherm_handle_alarm() - Handles soctherm alarms
+ * @alarm: The soctherm throttle id
+ *
+ * "Handles" over-current alarms (OC1, OC2, OC3, and OC4) by printing
+ * a warning or informative message.
+ *
+ * Return: -EINVAL for @alarm = THROTTLE_OC3, otherwise 0 (success).
+ */
+static int soctherm_handle_alarm(enum soctherm_throttle_id alarm)
+{
+ int rv = -EINVAL;
+
+ switch (alarm) {
+ case THROTTLE_OC1:
+ pr_debug("soctherm: Successfully handled OC1 alarm\n");
+ rv = 0;
+ break;
+
+ case THROTTLE_OC2:
+ pr_debug("soctherm: Successfully handled OC2 alarm\n");
+ rv = 0;
+ break;
+
+ case THROTTLE_OC3:
+ pr_debug("soctherm: Successfully handled OC3 alarm\n");
+ rv = 0;
+ break;
+
+ case THROTTLE_OC4:
+ pr_debug("soctherm: Successfully handled OC4 alarm\n");
+ rv = 0;
+ break;
+
+ default:
+ break;
+ }
+
+ if (rv)
+ pr_err("soctherm: ERROR in handling %s alarm\n",
+ throt_names[alarm]);
+
+ return rv;
+}
+
+/**
+ * soctherm_edp_isr_thread() - log an over-current interrupt request
+ * @irq: OC irq number. Currently not being used. See description
+ * @arg: a void pointer for callback, currently not being used
+ *
+ * Over-current events are handled in hardware. This function is called to log
+ * and handle any OC events that happened. Additionally, it checks every
+ * over-current interrupt registers for registers are set but
+ * was not expected (i.e. any discrepancy in interrupt status) by the function,
+ * the discrepancy will logged.
+ *
+ * Return: %IRQ_HANDLED
+ */
+static irqreturn_t soctherm_edp_isr_thread(int irq, void *arg)
+{
+ struct tegra_soctherm *ts = arg;
+ u32 st, ex, oc1, oc2, oc3, oc4;
+
+ st = readl(ts->regs + OC_INTR_STATUS);
+
+ /* deliberately clear expected interrupts handled in SW */
+ oc1 = st & OC_INTR_OC1_MASK;
+ oc2 = st & OC_INTR_OC2_MASK;
+ oc3 = st & OC_INTR_OC3_MASK;
+ oc4 = st & OC_INTR_OC4_MASK;
+ ex = oc1 | oc2 | oc3 | oc4;
+
+ pr_err("soctherm: OC ALARM 0x%08x\n", ex);
+ if (ex) {
+ writel(st, ts->regs + OC_INTR_STATUS);
+ st &= ~ex;
+
+ if (oc1 && !soctherm_handle_alarm(THROTTLE_OC1))
+ soctherm_oc_intr_enable(ts, THROTTLE_OC1, true);
+
+ if (oc2 && !soctherm_handle_alarm(THROTTLE_OC2))
+ soctherm_oc_intr_enable(ts, THROTTLE_OC2, true);
+
+ if (oc3 && !soctherm_handle_alarm(THROTTLE_OC3))
+ soctherm_oc_intr_enable(ts, THROTTLE_OC3, true);
+
+ if (oc4 && !soctherm_handle_alarm(THROTTLE_OC4))
+ soctherm_oc_intr_enable(ts, THROTTLE_OC4, true);
+
+ if (oc1 && soc_irq_cdata.irq_enable & BIT(0))
+ handle_nested_irq(
+ irq_find_mapping(soc_irq_cdata.domain, 0));
+
+ if (oc2 && soc_irq_cdata.irq_enable & BIT(1))
+ handle_nested_irq(
+ irq_find_mapping(soc_irq_cdata.domain, 1));
+
+ if (oc3 && soc_irq_cdata.irq_enable & BIT(2))
+ handle_nested_irq(
+ irq_find_mapping(soc_irq_cdata.domain, 2));
+
+ if (oc4 && soc_irq_cdata.irq_enable & BIT(3))
+ handle_nested_irq(
+ irq_find_mapping(soc_irq_cdata.domain, 3));
+ }
+
+ if (st) {
+ pr_err("soctherm: Ignored unexpected OC ALARM 0x%08x\n", st);
+ writel(st, ts->regs + OC_INTR_STATUS);
+ }
+
+ return IRQ_HANDLED;
+}
+
+/**
+ * soctherm_edp_isr() - Disables any active interrupts
+ * @irq: The interrupt request number
+ * @arg: Opaque pointer to an argument
+ *
+ * Writes to the OC_INTR_DISABLE register the over current interrupt status,
+ * masking any asserted interrupts. Doing this prevents the same interrupts
+ * from triggering this isr repeatedly. The thread woken by this isr will
+ * handle asserted interrupts and subsequently unmask/re-enable them.
+ *
+ * The OC_INTR_DISABLE register indicates which OC interrupts
+ * have been disabled.
+ *
+ * Return: %IRQ_WAKE_THREAD, handler requests to wake the handler thread
+ */
+static irqreturn_t soctherm_edp_isr(int irq, void *arg)
+{
+ struct tegra_soctherm *ts = arg;
+ u32 r;
+
+ if (!ts)
+ return IRQ_NONE;
+
+ r = readl(ts->regs + OC_INTR_STATUS);
+ writel(r, ts->regs + OC_INTR_DISABLE);
+
+ return IRQ_WAKE_THREAD;
+}
+
+/**
+ * soctherm_oc_irq_lock() - locks the over-current interrupt request
+ * @data: Interrupt request data
+ *
+ * Looks up the chip data from @data and locks the mutex associated with
+ * a particular over-current interrupt request.
+ */
+static void soctherm_oc_irq_lock(struct irq_data *data)
+{
+ struct soctherm_oc_irq_chip_data *d = irq_data_get_irq_chip_data(data);
+
+ mutex_lock(&d->irq_lock);
+}
+
+/**
+ * soctherm_oc_irq_sync_unlock() - Unlocks the OC interrupt request
+ * @data: Interrupt request data
+ *
+ * Looks up the interrupt request data @data and unlocks the mutex associated
+ * with a particular over-current interrupt request.
+ */
+static void soctherm_oc_irq_sync_unlock(struct irq_data *data)
+{
+ struct soctherm_oc_irq_chip_data *d = irq_data_get_irq_chip_data(data);
+
+ mutex_unlock(&d->irq_lock);
+}
+
+/**
+ * soctherm_oc_irq_enable() - Enables the SOC_THERM over-current interrupt queue
+ * @data: irq_data structure of the chip
+ *
+ * Sets the irq_enable bit of SOC_THERM allowing SOC_THERM
+ * to respond to over-current interrupts.
+ *
+ */
+static void soctherm_oc_irq_enable(struct irq_data *data)
+{
+ struct soctherm_oc_irq_chip_data *d = irq_data_get_irq_chip_data(data);
+
+ d->irq_enable |= BIT(data->hwirq);
+}
+
+/**
+ * soctherm_oc_irq_disable() - Disables overcurrent interrupt requests
+ * @irq_data: The interrupt request information
+ *
+ * Clears the interrupt request enable bit of the overcurrent
+ * interrupt request chip data.
+ *
+ * Return: Nothing is returned (void)
+ */
+static void soctherm_oc_irq_disable(struct irq_data *data)
+{
+ struct soctherm_oc_irq_chip_data *d = irq_data_get_irq_chip_data(data);
+
+ d->irq_enable &= ~BIT(data->hwirq);
+}
+
+static int soctherm_oc_irq_set_type(struct irq_data *data, unsigned int type)
+{
+ return 0;
+}
+
+/**
+ * soctherm_oc_irq_map() - SOC_THERM interrupt request domain mapper
+ * @h: Interrupt request domain
+ * @virq: Virtual interrupt request number
+ * @hw: Hardware interrupt request number
+ *
+ * Mapping callback function for SOC_THERM's irq_domain. When a SOC_THERM
+ * interrupt request is called, the irq_domain takes the request's virtual
+ * request number (much like a virtual memory address) and maps it to a
+ * physical hardware request number.
+ *
+ * When a mapping doesn't already exist for a virtual request number, the
+ * irq_domain calls this function to associate the virtual request number with
+ * a hardware request number.
+ *
+ * Return: 0
+ */
+static int soctherm_oc_irq_map(struct irq_domain *h, unsigned int virq,
+ irq_hw_number_t hw)
+{
+ struct soctherm_oc_irq_chip_data *data = h->host_data;
+
+ irq_set_chip_data(virq, data);
+ irq_set_chip(virq, &data->irq_chip);
+ irq_set_nested_thread(virq, 1);
+ return 0;
+}
+
+/**
+ * soctherm_irq_domain_xlate_twocell() - xlate for soctherm interrupts
+ * @d: Interrupt request domain
+ * @intspec: Array of u32s from DTs "interrupt" property
+ * @intsize: Number of values inside the intspec array
+ * @out_hwirq: HW IRQ value associated with this interrupt
+ * @out_type: The IRQ SENSE type for this interrupt.
+ *
+ * This Device Tree IRQ specifier translation function will translate a
+ * specific "interrupt" as defined by 2 DT values where the cell values map
+ * the hwirq number + 1 and linux irq flags. Since the output is the hwirq
+ * number, this function will subtract 1 from the value listed in DT.
+ *
+ * Return: 0
+ */
+static int soctherm_irq_domain_xlate_twocell(struct irq_domain *d,
+ struct device_node *ctrlr, const u32 *intspec, unsigned int intsize,
+ irq_hw_number_t *out_hwirq, unsigned int *out_type)
+{
+ if (WARN_ON(intsize < 2))
+ return -EINVAL;
+
+ /*
+ * The HW value is 1 index less than the DT IRQ values.
+ * i.e. OC4 goes to HW index 3.
+ */
+ *out_hwirq = intspec[0] - 1;
+ *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
+ return 0;
+}
+
+static const struct irq_domain_ops soctherm_oc_domain_ops = {
+ .map = soctherm_oc_irq_map,
+ .xlate = soctherm_irq_domain_xlate_twocell,
+};
+
+/**
+ * soctherm_oc_int_init() - Initial enabling of the over
+ * current interrupts
+ * @np: The devicetree node for soctherm
+ * @num_irqs: The number of new interrupt requests
+ *
+ * Sets the over current interrupt request chip data
+ *
+ * Return: 0 on success or if overcurrent interrupts are not enabled,
+ * -ENOMEM (out of memory), or irq_base if the function failed to
+ * allocate the irqs
+ */
+static int soctherm_oc_int_init(struct device_node *np, int num_irqs)
+{
+ if (!num_irqs) {
+ pr_info("%s(): OC interrupts are not enabled\n", __func__);
+ return 0;
+ }
+
+ mutex_init(&soc_irq_cdata.irq_lock);
+ soc_irq_cdata.irq_enable = 0;
+
+ soc_irq_cdata.irq_chip.name = "soc_therm_oc";
+ soc_irq_cdata.irq_chip.irq_bus_lock = soctherm_oc_irq_lock;
+ soc_irq_cdata.irq_chip.irq_bus_sync_unlock =
+ soctherm_oc_irq_sync_unlock;
+ soc_irq_cdata.irq_chip.irq_disable = soctherm_oc_irq_disable;
+ soc_irq_cdata.irq_chip.irq_enable = soctherm_oc_irq_enable;
+ soc_irq_cdata.irq_chip.irq_set_type = soctherm_oc_irq_set_type;
+ soc_irq_cdata.irq_chip.irq_set_wake = NULL;
+
+ soc_irq_cdata.domain = irq_domain_add_linear(np, num_irqs,
+ &soctherm_oc_domain_ops,
+ &soc_irq_cdata);
+
+ if (!soc_irq_cdata.domain) {
+ pr_err("%s: Failed to create IRQ domain\n", __func__);
+ return -ENOMEM;
+ }
+
+ pr_debug("%s(): OC interrupts enabled successful\n", __func__);
+ return 0;
+}
+
#ifdef CONFIG_DEBUG_FS
static int regs_show(struct seq_file *s, void *data)
{
@@ -1482,14 +1877,27 @@ static void tegra_soctherm_throttle(struct device *dev)
static int soctherm_interrupts_init(struct platform_device *pdev,
struct tegra_soctherm *tegra)
{
+ struct device_node *np = pdev->dev.of_node;
int ret;

+ ret = soctherm_oc_int_init(np, TEGRA_SOC_OC_IRQ_MAX);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "soctherm_oc_int_init failed\n");
+ return ret;
+ }
+
tegra->thermal_irq = platform_get_irq(pdev, 0);
if (tegra->thermal_irq < 0) {
dev_dbg(&pdev->dev, "get 'thermal_irq' failed.\n");
return 0;
}

+ tegra->edp_irq = platform_get_irq(pdev, 1);
+ if (tegra->edp_irq < 0) {
+ dev_dbg(&pdev->dev, "get 'edp_irq' failed.\n");
+ return 0;
+ }
+
ret = devm_request_threaded_irq(&pdev->dev,
tegra->thermal_irq,
soctherm_thermal_isr,
@@ -1502,6 +1910,18 @@ static int soctherm_interrupts_init(struct platform_device *pdev,
return ret;
}

+ ret = devm_request_threaded_irq(&pdev->dev,
+ tegra->edp_irq,
+ soctherm_edp_isr,
+ soctherm_edp_isr_thread,
+ IRQF_ONESHOT,
+ "soctherm_edp",
+ tegra);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "request_irq 'edp_irq' failed.\n");
+ return ret;
+ }
+
return 0;
}

--
2.7.4
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