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thermal: tegra: add support for thermal IRQ 

Support to generate an interrupt when the temperature
crosses a programmed threshold and notify the thermal framework.

Signed-off-by: Wei Ni <wni@nvidia.com>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
This commit is contained in:
Wei Ni 2019-02-21 18:18:42 +08:00 committed by Eduardo Valentin
parent 6ca29b7e82
commit d7180be0d5
1 changed files with 136 additions and 0 deletions
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136
drivers/thermal/tegra/soctherm.c
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@ -86,6 +86,20 @@
#define THERMCTL_LVL0_UP_STATS 0x10
#define THERMCTL_LVL0_DN_STATS 0x14
#define THERMCTL_INTR_STATUS 0x84
#define THERMCTL_INTR_ENABLE 0x88
#define THERMCTL_INTR_DISABLE 0x8c
#define TH_INTR_MD0_MASK BIT(25)
#define TH_INTR_MU0_MASK BIT(24)
#define TH_INTR_GD0_MASK BIT(17)
#define TH_INTR_GU0_MASK BIT(16)
#define TH_INTR_CD0_MASK BIT(9)
#define TH_INTR_CU0_MASK BIT(8)
#define TH_INTR_PD0_MASK BIT(1)
#define TH_INTR_PU0_MASK BIT(0)
#define TH_INTR_IGNORE_MASK 0xFCFCFCFC
#define THERMCTL_STATS_CTL 0x94
#define STATS_CTL_CLR_DN 0x8
#define STATS_CTL_EN_DN 0x4
@ -242,6 +256,8 @@ struct tegra_soctherm {
void __iomem *clk_regs;
void __iomem *ccroc_regs;
int thermal_irq;
u32 *calib;
struct thermal_zone_device **thermctl_tzs;
struct tegra_soctherm_soc *soc;
@ -672,6 +688,98 @@ static int tegra_soctherm_set_hwtrips(struct device *dev,
return 0;
}
static irqreturn_t soctherm_thermal_isr(int irq, void *dev_id)
{
struct tegra_soctherm *ts = dev_id;
u32 r;
r = readl(ts->regs + THERMCTL_INTR_STATUS);
writel(r, ts->regs + THERMCTL_INTR_DISABLE);
return IRQ_WAKE_THREAD;
}
/**
* soctherm_thermal_isr_thread() - Handles a thermal interrupt request
* @irq: The interrupt number being requested; not used
* @dev_id: Opaque pointer to tegra_soctherm;
*
* Clears the interrupt status register if there are expected
* interrupt bits set.
* The interrupt(s) are then handled by updating the corresponding
* thermal zones.
*
* An error is logged if any unexpected interrupt bits are set.
*
* Disabled interrupts are re-enabled.
*
* Return: %IRQ_HANDLED. Interrupt was handled and no further processing
* is needed.
*/
static irqreturn_t soctherm_thermal_isr_thread(int irq, void *dev_id)
{
struct tegra_soctherm *ts = dev_id;
struct thermal_zone_device *tz;
u32 st, ex = 0, cp = 0, gp = 0, pl = 0, me = 0;
st = readl(ts->regs + THERMCTL_INTR_STATUS);
/* deliberately clear expected interrupts handled in SW */
cp |= st & TH_INTR_CD0_MASK;
cp |= st & TH_INTR_CU0_MASK;
gp |= st & TH_INTR_GD0_MASK;
gp |= st & TH_INTR_GU0_MASK;
pl |= st & TH_INTR_PD0_MASK;
pl |= st & TH_INTR_PU0_MASK;
me |= st & TH_INTR_MD0_MASK;
me |= st & TH_INTR_MU0_MASK;
ex |= cp | gp | pl | me;
if (ex) {
writel(ex, ts->regs + THERMCTL_INTR_STATUS);
st &= ~ex;
if (cp) {
tz = ts->thermctl_tzs[TEGRA124_SOCTHERM_SENSOR_CPU];
thermal_zone_device_update(tz,
THERMAL_EVENT_UNSPECIFIED);
}
if (gp) {
tz = ts->thermctl_tzs[TEGRA124_SOCTHERM_SENSOR_GPU];
thermal_zone_device_update(tz,
THERMAL_EVENT_UNSPECIFIED);
}
if (pl) {
tz = ts->thermctl_tzs[TEGRA124_SOCTHERM_SENSOR_PLLX];
thermal_zone_device_update(tz,
THERMAL_EVENT_UNSPECIFIED);
}
if (me) {
tz = ts->thermctl_tzs[TEGRA124_SOCTHERM_SENSOR_MEM];
thermal_zone_device_update(tz,
THERMAL_EVENT_UNSPECIFIED);
}
}
/* deliberately ignore expected interrupts NOT handled in SW */
ex |= TH_INTR_IGNORE_MASK;
st &= ~ex;
if (st) {
/* Whine about any other unexpected INTR bits still set */
pr_err("soctherm: Ignored unexpected INTRs 0x%08x\n", st);
writel(st, ts->regs + THERMCTL_INTR_STATUS);
}
return IRQ_HANDLED;
}
#ifdef CONFIG_DEBUG_FS
static int regs_show(struct seq_file *s, void *data)
{
@ -1334,6 +1442,32 @@ static void tegra_soctherm_throttle(struct device *dev)
writel(v, ts->regs + THERMCTL_STATS_CTL);
}
static int soctherm_interrupts_init(struct platform_device *pdev,
struct tegra_soctherm *tegra)
{
int 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;
}
ret = devm_request_threaded_irq(&pdev->dev,
tegra->thermal_irq,
soctherm_thermal_isr,
soctherm_thermal_isr_thread,
IRQF_ONESHOT,
dev_name(&pdev->dev),
tegra);
if (ret < 0) {
dev_err(&pdev->dev, "request_irq 'thermal_irq' failed.\n");
return ret;
}
return 0;
}
static void soctherm_init(struct platform_device *pdev)
{
struct tegra_soctherm *tegra = platform_get_drvdata(pdev);
@ -1527,6 +1661,8 @@ static int tegra_soctherm_probe(struct platform_device *pdev)
goto disable_clocks;
}
err = soctherm_interrupts_init(pdev, tegra);
soctherm_debug_init(pdev);
return 0;