thermal: tegra: add support for EDP IRQ (4a04beb1) · Commits · github.com / kvm-riscv / linux

drivers/thermal/tegra/soctherm.c

+420 −0

Original line number	Diff line number	Diff line
		@@ -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
		@@ -839,6 +880,360 @@ 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)
		{
		@@ -1504,14 +1899,27 @@ 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,
		@@ -1524,6 +1932,18 @@ 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;
		}