[PATCH v10 1/8] drivers: thermal: tsens: Add VER_0 tsens version

Ansuel Smith
2021-02-18T00:57:20Z

VER_0 is used to describe device based on tsens version before v0.1.
These device are devices based on msm8960 for example apq8064 or
ipq806x.

Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
---
drivers/thermal/qcom/tsens.c | 175 +++++++++++++++++++++++++++++------
drivers/thermal/qcom/tsens.h | 4 +-
2 files changed, 151 insertions(+), 28 deletions(-)

diff --git a/drivers/thermal/qcom/tsens.c b/drivers/thermal/qcom/tsens.c
index d8ce3a687b80..f9126909892b 100644
--- a/drivers/thermal/qcom/tsens.c
+++ b/drivers/thermal/qcom/tsens.c
@@ -12,6 +12,7 @@
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
+#include <linux/mfd/syscon.h>
#include <linux/platform_device.h>
#include <linux/pm.h>
#include <linux/regmap.h>
@@ -515,6 +516,15 @@ static irqreturn_t tsens_irq_thread(int irq, void *data)
dev_dbg(priv->dev, "[%u] %s: no violation: %d\n",
hw_id, __func__, temp);
}
+
+ if (tsens_version(priv) < VER_0_1) {
+ /* Constraint: There is only 1 interrupt control register for all
+ * 11 temperature sensor. So monitoring more than 1 sensor based
+ * on interrupts will yield inconsistent result. To overcome this
+ * issue we will monitor only sensor 0 which is the master sensor.
+ */
+ break;
+ }
}

return IRQ_HANDLED;
@@ -530,6 +540,13 @@ static int tsens_set_trips(void *_sensor, int low, int high)
int high_val, low_val, cl_high, cl_low;
u32 hw_id = s->hw_id;

+ if (tsens_version(priv) < VER_0_1) {
+ /* Pre v0.1 IP had a single register for each type of interrupt
+ * and thresholds
+ */
+ hw_id = 0;
+ }
+
dev_dbg(dev, "[%u] %s: proposed thresholds: (%d:%d)\n",
hw_id, __func__, low, high);

@@ -584,18 +601,21 @@ int get_temp_tsens_valid(const struct tsens_sensor *s, int *temp)
u32 valid;
int ret;

- ret = regmap_field_read(priv->rf[valid_idx], &valid);
- if (ret)
- return ret;
- while (!valid) {
- /* Valid bit is 0 for 6 AHB clock cycles.
- * At 19.2MHz, 1 AHB clock is ~60ns.
- * We should enter this loop very, very rarely.
- */
- ndelay(400);
+ /* VER_0 doesn't have VALID bit */
+ if (tsens_version(priv) >= VER_0_1) {
ret = regmap_field_read(priv->rf[valid_idx], &valid);
if (ret)
return ret;
+ while (!valid) {
+ /* Valid bit is 0 for 6 AHB clock cycles.
+ * At 19.2MHz, 1 AHB clock is ~60ns.
+ * We should enter this loop very, very rarely.
+ */
+ ndelay(400);
+ ret = regmap_field_read(priv->rf[valid_idx], &valid);
+ if (ret)
+ return ret;
+ }
}

/* Valid bit is set, OK to read the temperature */
@@ -608,15 +628,29 @@ int get_temp_common(const struct tsens_sensor *s, int *temp)
{
struct tsens_priv *priv = s->priv;
int hw_id = s->hw_id;
- int last_temp = 0, ret;
+ int last_temp = 0, ret, trdy;
+ unsigned long timeout;

- ret = regmap_field_read(priv->rf[LAST_TEMP_0 + hw_id], &last_temp);
- if (ret)
- return ret;
+ timeout = jiffies + usecs_to_jiffies(TIMEOUT_US);
+ do {
+ if (priv->rf[TRDY]) {
+ ret = regmap_field_read(priv->rf[TRDY], &trdy);
+ if (ret)
+ return ret;
+ if (!trdy)
+ continue;
+ }
+
+ ret = regmap_field_read(priv->rf[LAST_TEMP_0 + hw_id], &last_temp);
+ if (ret)
+ return ret;

- *temp = code_to_degc(last_temp, s) * 1000;
+ *temp = code_to_degc(last_temp, s) * 1000;

- return 0;
+ return 0;
+ } while (time_before(jiffies, timeout));
+
+ return -ETIMEDOUT;
}

#ifdef CONFIG_DEBUG_FS
@@ -738,19 +772,31 @@ int __init init_common(struct tsens_priv *priv)
priv->tm_offset = 0x1000;
}

- res = platform_get_resource(op, IORESOURCE_MEM, 0);
- tm_base = devm_ioremap_resource(dev, res);
- if (IS_ERR(tm_base)) {
- ret = PTR_ERR(tm_base);
- goto err_put_device;
+ if (tsens_version(priv) >= VER_0_1) {
+ res = platform_get_resource(op, IORESOURCE_MEM, 0);
+ tm_base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(tm_base)) {
+ ret = PTR_ERR(tm_base);
+ goto err_put_device;
+ }
+
+ priv->tm_map = devm_regmap_init_mmio(dev, tm_base, &tsens_config);
+ } else { /* VER_0 share the same gcc regs using a syscon */
+ struct device *parent = priv->dev->parent;
+
+ if (parent)
+ priv->tm_map = syscon_node_to_regmap(parent->of_node);
}

- priv->tm_map = devm_regmap_init_mmio(dev, tm_base, &tsens_config);
- if (IS_ERR(priv->tm_map)) {
+ if (IS_ERR_OR_NULL(priv->tm_map)) {
ret = PTR_ERR(priv->tm_map);
goto err_put_device;
}

+ /* VER_0 have only tm_map */
+ if (!priv->srot_map)
+ priv->srot_map = priv->tm_map;
+
if (tsens_version(priv) > VER_0_1) {
for (i = VER_MAJOR; i <= VER_STEP; i++) {
priv->rf[i] = devm_regmap_field_alloc(dev, priv->srot_map,
@@ -769,6 +815,10 @@ int __init init_common(struct tsens_priv *priv)
ret = PTR_ERR(priv->rf[TSENS_EN]);
goto err_put_device;
}
+ /* in VER_0 TSENS need to be explicitly enabled */
+ if (tsens_version(priv) == VER_0)
+ regmap_field_write(priv->rf[TSENS_EN], 1);
+
ret = regmap_field_read(priv->rf[TSENS_EN], &enabled);
if (ret)
goto err_put_device;
@@ -791,6 +841,57 @@ int __init init_common(struct tsens_priv *priv)
goto err_put_device;
}

+ priv->rf[TSENS_EN] = devm_regmap_field_alloc(dev, priv->tm_map,
+ priv->fields[TSENS_EN]);
+ if (IS_ERR(priv->rf[TSENS_EN])) {
+ ret = PTR_ERR(priv->rf[TSENS_EN]);
+ goto err_put_device;
+ }
+
+ priv->rf[TSENS_SW_RST] = devm_regmap_field_alloc(
+ dev, priv->tm_map, priv->fields[TSENS_EN]);
+ if (IS_ERR(priv->rf[TSENS_EN])) {
+ ret = PTR_ERR(priv->rf[TSENS_EN]);
+ goto err_put_device;
+ }
+
+ priv->rf[LOW_INT_CLEAR_0] = devm_regmap_field_alloc(
+ dev, priv->tm_map, priv->fields[LOW_INT_CLEAR_0]);
+ if (IS_ERR(priv->rf[LOW_INT_CLEAR_0])) {
+ ret = PTR_ERR(priv->rf[LOW_INT_CLEAR_0]);
+ goto err_put_device;
+ }
+
+ priv->rf[UP_INT_CLEAR_0] = devm_regmap_field_alloc(
+ dev, priv->tm_map, priv->fields[UP_INT_CLEAR_0]);
+ if (IS_ERR(priv->rf[UP_INT_CLEAR_0])) {
+ ret = PTR_ERR(priv->rf[UP_INT_CLEAR_0]);
+ goto err_put_device;
+ }
+
+ if (tsens_version(priv) < VER_0_1) {
+ priv->rf[CRIT_THRESH_0] = devm_regmap_field_alloc(
+ dev, priv->tm_map, priv->fields[CRIT_THRESH_0]);
+ if (IS_ERR(priv->rf[CRIT_THRESH_0])) {
+ ret = PTR_ERR(priv->rf[CRIT_THRESH_0]);
+ goto err_put_device;
+ }
+
+ priv->rf[CRIT_THRESH_1] = devm_regmap_field_alloc(
+ dev, priv->tm_map, priv->fields[CRIT_THRESH_1]);
+ if (IS_ERR(priv->rf[CRIT_THRESH_1])) {
+ ret = PTR_ERR(priv->rf[CRIT_THRESH_1]);
+ goto err_put_device;
+ }
+ }
+
+ priv->rf[TRDY] =
+ devm_regmap_field_alloc(dev, priv->tm_map, priv->fields[TRDY]);
+ if (IS_ERR(priv->rf[TRDY])) {
+ ret = PTR_ERR(priv->rf[TRDY]);
+ goto err_put_device;
+ }
+
/* This loop might need changes if enum regfield_ids is reordered */
for (j = LAST_TEMP_0; j <= UP_THRESH_15; j += 16) {
for (i = 0; i < priv->feat->max_sensors; i++) {
@@ -844,7 +945,11 @@ int __init init_common(struct tsens_priv *priv)
}

spin_lock_init(&priv->ul_lock);
- tsens_enable_irq(priv);
+
+ /* VER_0 interrupt doesn't need to be enabled */
+ if (tsens_version(priv) >= VER_0_1)
+ tsens_enable_irq(priv);
+
tsens_debug_init(op);

err_put_device:
@@ -930,7 +1035,7 @@ static int tsens_register_irq(struct tsens_priv *priv, char *irqname,
irq_handler_t thread_fn)
{
struct platform_device *pdev;
- int ret, irq;
+ int ret, irq, irq_type = IRQF_ONESHOT;

pdev = of_find_device_by_node(priv->dev->of_node);
if (!pdev)
@@ -943,9 +1048,12 @@ static int tsens_register_irq(struct tsens_priv *priv, char *irqname,
if (irq == -ENXIO)
ret = 0;
} else {
- ret = devm_request_threaded_irq(&pdev->dev, irq,
- NULL, thread_fn,
- IRQF_ONESHOT,
+ /* VER_0 interrupt is TRIGGER_RISING, VER_0_1 and up is ONESHOT */
+ if (tsens_version(priv) == VER_0)
+ irq_type = IRQF_TRIGGER_RISING;
+
+ ret = devm_request_threaded_irq(&pdev->dev, irq, thread_fn,
+ NULL, irq_type,
dev_name(&pdev->dev), priv);
if (ret)
dev_err(&pdev->dev, "%s: failed to get irq\n",
@@ -975,6 +1083,19 @@ static int tsens_register(struct tsens_priv *priv)
priv->ops->enable(priv, i);
}

+ /* VER_0 require to set MIN and MAX THRESH
+ * These 2 regs are set using the:
+ * - CRIT_THRESH_0 for MAX THRESH hardcoded to 120°C
+ * - CRIT_THRESH_1 for MIN THRESH hardcoded to 0°C
+ */
+ if (tsens_version(priv) < VER_0_1) {
+ regmap_field_write(priv->rf[CRIT_THRESH_0],
+ tsens_mC_to_hw(priv->sensor, 120000));
+
+ regmap_field_write(priv->rf[CRIT_THRESH_1],
+ tsens_mC_to_hw(priv->sensor, 0));
+ }
+
ret = tsens_register_irq(priv, "uplow", tsens_irq_thread);
if (ret < 0)
return ret;
diff --git a/drivers/thermal/qcom/tsens.h b/drivers/thermal/qcom/tsens.h
index f40b625f897e..8e6c1fd3ccf5 100644
--- a/drivers/thermal/qcom/tsens.h
+++ b/drivers/thermal/qcom/tsens.h
@@ -13,6 +13,7 @@
#define CAL_DEGC_PT2 120
#define SLOPE_FACTOR 1000
#define SLOPE_DEFAULT 3200
+#define TIMEOUT_US 100
#define THRESHOLD_MAX_ADC_CODE 0x3ff
#define THRESHOLD_MIN_ADC_CODE 0x0

@@ -25,7 +26,8 @@ struct tsens_priv;

/* IP version numbers in ascending order */
enum tsens_ver {
- VER_0_1 = 0,
+ VER_0 = 0,
+ VER_0_1,
VER_1_X,
VER_2_X,
};
--
2.30.0