[PATCH v3 03/11] thermal: tegra: add hw-throttle for Tegra132

From: Wei Ni
Date: Tue May 03 2016 - 06:15:52 EST

Tegra132 use CCROC throttle registers to configure
pulse skiper, set these registers to enable throttle
function for Tegra132.

Signed-off-by: Wei Ni <wni@xxxxxxxxxx>
---
drivers/thermal/tegra/soctherm.c | 234 +++++++++++++++++++++---
drivers/thermal/tegra/tegra132-soctherm.c | 17 ++
include/dt-bindings/thermal/tegra124-soctherm.h | 5 +
3 files changed, 226 insertions(+), 30 deletions(-)

diff --git a/drivers/thermal/tegra/soctherm.c b/drivers/thermal/tegra/soctherm.c
index d7fd67928607..452e20f6c8b0 100644
--- a/drivers/thermal/tegra/soctherm.c
+++ b/drivers/thermal/tegra/soctherm.c
@@ -136,6 +136,21 @@
#define CAR_SUPER_CCLKG_DIVIDER 0x36c
#define CDIVG_USE_THERM_CONTROLS_MASK BIT(30)

+/* ccroc register offsets needed for enabling HW throttling for Tegra132 */
+#define CCROC_SUPER_CCLKG_DIVIDER 0x024
+
+#define CCROC_GLOBAL_CFG 0x148
+
+#define CCROC_THROT_PSKIP_RAMP_CPU 0x150
+#define CCROC_THROT_PSKIP_RAMP_SEQ_BYPASS_MODE_MASK BIT(31)
+#define CCROC_THROT_PSKIP_RAMP_DURATION_MASK (0xffff << 8)
+#define CCROC_THROT_PSKIP_RAMP_STEP_MASK 0xff
+
+#define CCROC_THROT_PSKIP_CTRL_CPU 0x154
+#define CCROC_THROT_PSKIP_CTRL_ENB_MASK BIT(31)
+#define CCROC_THROT_PSKIP_CTRL_DIVIDEND_MASK (0xff << 8)
+#define CCROC_THROT_PSKIP_CTRL_DIVISOR_MASK 0xff
+
/* get val from register(r) mask bits(m) */
#define REG_GET_MASK(r, m) (((r) & (m)) >> (ffs(m) - 1))
/* set val(v) to mask bits(m) of register(r) */
@@ -158,6 +173,13 @@
#define THROT_DELAY_CTRL(throt) (THROT_DELAY_LITE + \
(THROT_OFFSET * throt))

+/* get CCROC_THROT_PSKIP_xxx offset per HIGH/MED/LOW vect*/
+#define CCROC_THROT_OFFSET 0x0c
+#define CCROC_THROT_PSKIP_CTRL_CPU_REG(vect) (CCROC_THROT_PSKIP_CTRL_CPU + \
+ (CCROC_THROT_OFFSET * vect))
+#define CCROC_THROT_PSKIP_RAMP_CPU_REG(vect) (CCROC_THROT_PSKIP_RAMP_CPU + \
+ (CCROC_THROT_OFFSET * vect))
+
/* get THERMCTL_LEVELx offset per CPU/GPU/MEM/TSENSE rg and LEVEL0~3 lv */
#define THERMCTL_LVL_REGS_SIZE 0x20
#define THERMCTL_LVL_REG(rg, lv) ((rg) + ((lv) * THERMCTL_LVL_REGS_SIZE))
@@ -195,6 +217,7 @@ struct soctherm_throt_cfg {
const char *name;
unsigned int id;
u8 priority;
+ u8 cpu_throt_level;
u32 cpu_throt_depth;
struct thermal_cooling_device *cdev;
bool init;
@@ -206,6 +229,7 @@ struct tegra_soctherm {
struct clk *clock_soctherm;
void __iomem *regs;
void __iomem *clk_regs;
+ void __iomem *ccroc_regs;

u32 *calib;
struct thermal_zone_device **thermctl_tzs;
@@ -241,6 +265,31 @@ static inline u32 clk_readl(struct tegra_soctherm *ts, u32 reg)
return readl(ts->clk_regs + reg);
}

+/**
+ * ccroc_writel() - writes a value to a CCROC register
+ * @ts: pointer to a struct tegra_soctherm
+ * @v: the value to write
+ * @reg: the register offset
+ *
+ * Writes @v to @reg. No return value.
+ */
+static inline void ccroc_writel(struct tegra_soctherm *ts, u32 value, u32 reg)
+{
+ writel(value, (ts->ccroc_regs + reg));
+}
+
+/**
+ * ccroc_readl() - reads specified register from CCROC IP block
+ * @ts: pointer to a struct tegra_soctherm
+ * @reg: register address to be read
+ *
+ * Return: the value of the register
+ */
+static inline u32 ccroc_readl(struct tegra_soctherm *ts, u32 reg)
+{
+ return readl(ts->ccroc_regs + reg);
+}
+
static void enable_tsensor(struct tegra_soctherm *tegra, unsigned int i)
{
const struct tegra_tsensor *sensor = &tegra->soc->tsensors[i];
@@ -552,9 +601,6 @@ static int tegra_soctherm_set_hwtrips(struct device *dev,
sg->name, temperature);

set_throttle:
- if (ts->soc->use_ccroc)
- return 0;
-
ret = get_hot_temp(tz, &trip, &temperature);
if (ret) {
dev_warn(dev, "throttrip: %s: missing hot temperature\n",
@@ -676,9 +722,6 @@ static int regs_show(struct seq_file *s, void *data)
state = REG_GET_MASK(r, SENSOR_TEMP2_MEM_TEMP_MASK);
seq_printf(s, " MEM(%d)\n", translate_temp(state));

- if (ts->soc->use_ccroc)
- return 0;
-
for (i = 0; i < ts->soc->num_ttgs; i++) {
seq_printf(s, "%s:\n", ttgs[i]->name);
for (level = 0; level < 4; level++) {
@@ -779,12 +822,17 @@ static int regs_show(struct seq_file *s, void *data)
seq_printf(s, "enabled(%d)\n", state);

r = readl(ts->regs + CPU_PSKIP_STATUS);
- state = REG_GET_MASK(r, XPU_PSKIP_STATUS_M_MASK);
- seq_printf(s, "CPU PSKIP STATUS: M(%d) ", state);
- state = REG_GET_MASK(r, XPU_PSKIP_STATUS_N_MASK);
- seq_printf(s, "N(%d) ", state);
- state = REG_GET_MASK(r, XPU_PSKIP_STATUS_ENABLED_MASK);
- seq_printf(s, "enabled(%d)\n", state);
+ if (ts->soc->use_ccroc) {
+ state = REG_GET_MASK(r, XPU_PSKIP_STATUS_ENABLED_MASK);
+ seq_printf(s, "CPU PSKIP STATUS: enabled(%d)\n", state);
+ } else {
+ state = REG_GET_MASK(r, XPU_PSKIP_STATUS_M_MASK);
+ seq_printf(s, "CPU PSKIP STATUS: M(%d) ", state);
+ state = REG_GET_MASK(r, XPU_PSKIP_STATUS_N_MASK);
+ seq_printf(s, "N(%d) ", state);
+ state = REG_GET_MASK(r, XPU_PSKIP_STATUS_ENABLED_MASK);
+ seq_printf(s, "enabled(%d)\n", state);
+ }

return 0;
}
@@ -939,15 +987,29 @@ static void soctherm_init_hw_throt_cdev(struct platform_device *pdev)
}
stc->priority = val;

- r = of_property_read_u32(np_stcc, "nvidia,cpu-throt-depth",
- &val);
- if (r) {
- dev_info(dev,
- "throttle-cfg: %s: missing cpu_throt_depth\n",
- name);
- continue;
+ if (ts->soc->use_ccroc) {
+ r = of_property_read_u32(np_stcc,
+ "nvidia,cpu-throt-level",
+ &val);
+ if (r) {
+ dev_info(dev,
+ "throttle-cfg: %s: missing cpu_throt_level\n",
+ name);
+ continue;
+ }
+ stc->cpu_throt_level = val;
+ } else {
+ r = of_property_read_u32(np_stcc,
+ "nvidia,cpu-throt-depth",
+ &val);
+ if (r) {
+ dev_info(dev,
+ "throttle-cfg: %s: missing cpu_throt_depth\n",
+ name);
+ continue;
+ }
+ stc->cpu_throt_depth = val;
}
- stc->cpu_throt_depth = val;

tcd = thermal_of_cooling_device_register(np_stcc,
(char *)name, ts,
@@ -968,6 +1030,96 @@ static void soctherm_init_hw_throt_cdev(struct platform_device *pdev)
}

/**
+ * throttlectl_cpu_level_cfg() - programs CCROC NV_THERM level config
+ * @level: describing the level LOW/MED/HIGH of throttling
+ *
+ * It's necessary to set up the CPU-local CCROC NV_THERM instance with
+ * the M/N values desired for each level. This function does this.
+ *
+ * This function pre-programs the CCROC NV_THERM levels in terms of
+ * pre-configured "Low", "Medium" or "Heavy" throttle levels which are
+ * mapped to THROT_LEVEL_LOW, THROT_LEVEL_MED and THROT_LEVEL_HVY.
+ */
+static void throttlectl_cpu_level_cfg(struct tegra_soctherm *ts, int level)
+{
+ u8 depth, dividend;
+ u32 r;
+
+ switch (level) {
+ case TEGRA_SOCTHERM_THROT_LEVEL_LOW:
+ depth = 50;
+ break;
+ case TEGRA_SOCTHERM_THROT_LEVEL_MED:
+ depth = 75;
+ break;
+ case TEGRA_SOCTHERM_THROT_LEVEL_HIGH:
+ depth = 80;
+ break;
+ case TEGRA_SOCTHERM_THROT_LEVEL_NONE:
+ return;
+ default:
+ return;
+ }
+
+ dividend = THROT_DEPTH_DIVIDEND(depth);
+
+ /* setup PSKIP in ccroc nv_therm registers */
+ r = ccroc_readl(ts, CCROC_THROT_PSKIP_RAMP_CPU_REG(level));
+ r = REG_SET_MASK(r, CCROC_THROT_PSKIP_RAMP_DURATION_MASK, 0xff);
+ r = REG_SET_MASK(r, CCROC_THROT_PSKIP_RAMP_STEP_MASK, 0xf);
+ ccroc_writel(ts, r, CCROC_THROT_PSKIP_RAMP_CPU_REG(level));
+
+ r = ccroc_readl(ts, CCROC_THROT_PSKIP_CTRL_CPU_REG(level));
+ r = REG_SET_MASK(r, CCROC_THROT_PSKIP_CTRL_ENB_MASK, 1);
+ r = REG_SET_MASK(r, CCROC_THROT_PSKIP_CTRL_DIVIDEND_MASK, dividend);
+ r = REG_SET_MASK(r, CCROC_THROT_PSKIP_CTRL_DIVISOR_MASK, 0xff);
+ ccroc_writel(ts, r, CCROC_THROT_PSKIP_CTRL_CPU_REG(level));
+}
+
+/**
+ * throttlectl_cpu_level_select() - program CPU pulse skipper config
+ * @throt: the LIGHT/HEAVY of throttle event id
+ *
+ * Pulse skippers are used to throttle clock frequencies. This
+ * function programs the pulse skippers based on @throt and platform
+ * data. This function is used on SoCs which have CPU-local pulse
+ * skipper control, such as T13x. It programs soctherm's interface to
+ * Denver:CCROC NV_THERM in terms of Low, Medium and HIGH throttling
+ * vectors. PSKIP_BYPASS mode is set as required per HW spec.
+ */
+static void throttlectl_cpu_level_select(struct tegra_soctherm *ts,
+ enum soctherm_throttle_id throt)
+{
+ u32 r, throt_vect;
+
+ /* Denver:CCROC NV_THERM interface N:3 Mapping */
+ switch (ts->throt_cfgs[throt].cpu_throt_level) {
+ case TEGRA_SOCTHERM_THROT_LEVEL_LOW:
+ throt_vect = THROT_VECT_LOW;
+ break;
+ case TEGRA_SOCTHERM_THROT_LEVEL_MED:
+ throt_vect = THROT_VECT_MED;
+ break;
+ case TEGRA_SOCTHERM_THROT_LEVEL_HIGH:
+ throt_vect = THROT_VECT_HIGH;
+ break;
+ default:
+ throt_vect = THROT_VECT_NONE;
+ break;
+ }
+
+ r = readl(ts->regs + THROT_PSKIP_CTRL(throt, THROTTLE_DEV_CPU));
+ r = REG_SET_MASK(r, THROT_PSKIP_CTRL_ENABLE_MASK, 1);
+ r = REG_SET_MASK(r, THROT_PSKIP_CTRL_VECT_CPU_MASK, throt_vect);
+ r = REG_SET_MASK(r, THROT_PSKIP_CTRL_VECT2_CPU_MASK, throt_vect);
+ writel(r, ts->regs + THROT_PSKIP_CTRL(throt, THROTTLE_DEV_CPU));
+
+ /* bypass sequencer in soc_therm as it is programmed in ccroc */
+ r = REG_SET_MASK(0, THROT_PSKIP_RAMP_SEQ_BYPASS_MODE_MASK, 1);
+ writel(r, ts->regs + THROT_PSKIP_RAMP(throt, THROTTLE_DEV_CPU));
+}
+
+/**
* throttlectl_cpu_mn() - program CPU pulse skipper configuration
* @throt: the LIGHT/HEAVY of throttle event id
*
@@ -1017,7 +1169,10 @@ static void soctherm_throttle_program(struct tegra_soctherm *ts,
return;

/* Setup PSKIP parameters */
- throttlectl_cpu_mn(ts, throt);
+ if (ts->soc->use_ccroc)
+ throttlectl_cpu_level_select(ts, throt);
+ else
+ throttlectl_cpu_mn(ts, throt);

r = REG_SET_MASK(0, THROT_PRIORITY_LITE_PRIO_MASK, stc.priority);
writel(r, ts->regs + THROT_PRIORITY_CTRL(throt));
@@ -1040,16 +1195,31 @@ static void tegra_soctherm_throttle(struct device *dev)
u32 v;
int i;

+ /* configure LOW, MED and HIGH levels for CCROC NV_THERM */
+ if (ts->soc->use_ccroc) {
+ throttlectl_cpu_level_cfg(ts, TEGRA_SOCTHERM_THROT_LEVEL_LOW);
+ throttlectl_cpu_level_cfg(ts, TEGRA_SOCTHERM_THROT_LEVEL_MED);
+ throttlectl_cpu_level_cfg(ts, TEGRA_SOCTHERM_THROT_LEVEL_HIGH);
+ }
+
/* Thermal HW throttle programming */
for (i = 0; i < THROTTLE_SIZE; i++)
soctherm_throttle_program(ts, i);

v = REG_SET_MASK(0, THROT_GLOBAL_ENB_MASK, 1);
- writel(v, ts->regs + THROT_GLOBAL_CFG);
+ if (ts->soc->use_ccroc) {
+ ccroc_writel(ts, v, CCROC_GLOBAL_CFG);

- v = clk_readl(ts, CAR_SUPER_CCLKG_DIVIDER);
- v = REG_SET_MASK(v, CDIVG_USE_THERM_CONTROLS_MASK, 1);
- clk_writel(ts, v, CAR_SUPER_CCLKG_DIVIDER);
+ v = ccroc_readl(ts, CCROC_SUPER_CCLKG_DIVIDER);
+ v = REG_SET_MASK(v, CDIVG_USE_THERM_CONTROLS_MASK, 1);
+ ccroc_writel(ts, v, CCROC_SUPER_CCLKG_DIVIDER);
+ } else {
+ writel(v, ts->regs + THROT_GLOBAL_CFG);
+
+ v = clk_readl(ts, CAR_SUPER_CCLKG_DIVIDER);
+ v = REG_SET_MASK(v, CDIVG_USE_THERM_CONTROLS_MASK, 1);
+ clk_writel(ts, v, CAR_SUPER_CCLKG_DIVIDER);
+ }

/* initialize stats collection */
v = STATS_CTL_CLR_DN | STATS_CTL_EN_DN |
@@ -1084,9 +1254,6 @@ static void soctherm_init(struct platform_device *pdev)
writel(pdiv, tegra->regs + SENSOR_PDIV);
writel(hotspot, tegra->regs + SENSOR_HOTSPOT_OFF);

- if (tegra->soc->use_ccroc)
- return;
-
/* Configure hw throttle */
tegra_soctherm_throttle(&pdev->dev);
}
@@ -1157,6 +1324,14 @@ static int tegra_soctherm_probe(struct platform_device *pdev)
dev_err(&pdev->dev, "can't get car clk registers");
return PTR_ERR(tegra->clk_regs);
}
+ } else {
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
+ "ccroc-reg");
+ tegra->ccroc_regs = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(tegra->ccroc_regs)) {
+ dev_err(&pdev->dev, "can't get ccroc registers");
+ return PTR_ERR(tegra->ccroc_regs);
+ }
}

tegra->reset = devm_reset_control_get(&pdev->dev, "soctherm");
@@ -1207,8 +1382,7 @@ static int tegra_soctherm_probe(struct platform_device *pdev)
if (err)
return err;

- if (!tegra->soc->use_ccroc)
- soctherm_init_hw_throt_cdev(pdev);
+ soctherm_init_hw_throt_cdev(pdev);

soctherm_init(pdev);

diff --git a/drivers/thermal/tegra/tegra132-soctherm.c b/drivers/thermal/tegra/tegra132-soctherm.c
index ae5d61af2df3..97fa30501eb1 100644
--- a/drivers/thermal/tegra/tegra132-soctherm.c
+++ b/drivers/thermal/tegra/tegra132-soctherm.c
@@ -28,7 +28,11 @@
#define TEGRA132_THERMTRIP_CPU_THRESH_MASK (0xff << 8)
#define TEGRA132_THERMTRIP_TSENSE_THRESH_MASK 0xff

+#define TEGRA132_THERMCTL_LVL0_UP_THRESH_MASK (0xff << 17)
+#define TEGRA132_THERMCTL_LVL0_DN_THRESH_MASK (0xff << 9)
+
#define TEGRA132_THRESH_GRAIN 1000
+#define TEGRA132_BPTT 8

static const struct tegra_tsensor_configuration tegra132_tsensor_config = {
.tall = 16300,
@@ -51,6 +55,9 @@ static const struct tegra_tsensor_group tegra132_tsensor_group_cpu = {
.thermtrip_any_en_mask = TEGRA132_THERMTRIP_ANY_EN_MASK,
.thermtrip_enable_mask = TEGRA132_THERMTRIP_CPU_EN_MASK,
.thermtrip_threshold_mask = TEGRA132_THERMTRIP_CPU_THRESH_MASK,
+ .thermctl_lvl0_offset = THERMCTL_LEVEL0_GROUP_CPU,
+ .thermctl_lvl0_up_thresh_mask = TEGRA132_THERMCTL_LVL0_UP_THRESH_MASK,
+ .thermctl_lvl0_dn_thresh_mask = TEGRA132_THERMCTL_LVL0_DN_THRESH_MASK,
};

static const struct tegra_tsensor_group tegra132_tsensor_group_gpu = {
@@ -66,6 +73,9 @@ static const struct tegra_tsensor_group tegra132_tsensor_group_gpu = {
.thermtrip_any_en_mask = TEGRA132_THERMTRIP_ANY_EN_MASK,
.thermtrip_enable_mask = TEGRA132_THERMTRIP_GPU_EN_MASK,
.thermtrip_threshold_mask = TEGRA132_THERMTRIP_GPUMEM_THRESH_MASK,
+ .thermctl_lvl0_offset = THERMCTL_LEVEL0_GROUP_GPU,
+ .thermctl_lvl0_up_thresh_mask = TEGRA132_THERMCTL_LVL0_UP_THRESH_MASK,
+ .thermctl_lvl0_dn_thresh_mask = TEGRA132_THERMCTL_LVL0_DN_THRESH_MASK,
};

static const struct tegra_tsensor_group tegra132_tsensor_group_pll = {
@@ -79,6 +89,9 @@ static const struct tegra_tsensor_group tegra132_tsensor_group_pll = {
.thermtrip_any_en_mask = TEGRA132_THERMTRIP_ANY_EN_MASK,
.thermtrip_enable_mask = TEGRA132_THERMTRIP_TSENSE_EN_MASK,
.thermtrip_threshold_mask = TEGRA132_THERMTRIP_TSENSE_THRESH_MASK,
+ .thermctl_lvl0_offset = THERMCTL_LEVEL0_GROUP_TSENSE,
+ .thermctl_lvl0_up_thresh_mask = TEGRA132_THERMCTL_LVL0_UP_THRESH_MASK,
+ .thermctl_lvl0_dn_thresh_mask = TEGRA132_THERMCTL_LVL0_DN_THRESH_MASK,
};

static const struct tegra_tsensor_group tegra132_tsensor_group_mem = {
@@ -94,6 +107,9 @@ static const struct tegra_tsensor_group tegra132_tsensor_group_mem = {
.thermtrip_any_en_mask = TEGRA132_THERMTRIP_ANY_EN_MASK,
.thermtrip_enable_mask = TEGRA132_THERMTRIP_MEM_EN_MASK,
.thermtrip_threshold_mask = TEGRA132_THERMTRIP_GPUMEM_THRESH_MASK,
+ .thermctl_lvl0_offset = THERMCTL_LEVEL0_GROUP_MEM,
+ .thermctl_lvl0_up_thresh_mask = TEGRA132_THERMCTL_LVL0_UP_THRESH_MASK,
+ .thermctl_lvl0_dn_thresh_mask = TEGRA132_THERMCTL_LVL0_DN_THRESH_MASK,
};

static const struct tegra_tsensor_group *tegra132_tsensor_groups[] = {
@@ -193,5 +209,6 @@ const struct tegra_soctherm_soc tegra132_soctherm = {
.num_ttgs = ARRAY_SIZE(tegra132_tsensor_groups),
.tfuse = &tegra132_soctherm_fuse,
.thresh_grain = TEGRA132_THRESH_GRAIN,
+ .bptt = TEGRA132_BPTT,
.use_ccroc = true,
};
diff --git a/include/dt-bindings/thermal/tegra124-soctherm.h b/include/dt-bindings/thermal/tegra124-soctherm.h
index 729ab9fc325e..2a99f1d52bb5 100644
--- a/include/dt-bindings/thermal/tegra124-soctherm.h
+++ b/include/dt-bindings/thermal/tegra124-soctherm.h
@@ -11,4 +11,9 @@
#define TEGRA124_SOCTHERM_SENSOR_PLLX 3
#define TEGRA124_SOCTHERM_SENSOR_NUM 4

+#define TEGRA_SOCTHERM_THROT_LEVEL_LOW 0
+#define TEGRA_SOCTHERM_THROT_LEVEL_MED 1
+#define TEGRA_SOCTHERM_THROT_LEVEL_HIGH 2
+#define TEGRA_SOCTHERM_THROT_LEVEL_NONE -1
+
#endif
--
1.9.1