static
int ti_bandgap_remove(struct platform_device *pdev)
{
struct ti_bandgap *bgp = platform_get_drvdata(pdev);
int i;
/* First thing is to remove sensor interfaces */
for (i = 0; i < bgp->conf->sensor_count; i++) {
if (bgp->conf->sensors[i].unregister_cooling)
bgp->conf->sensors[i].unregister_cooling(bgp, i);
if (bgp->conf->remove_sensor)
bgp->conf->remove_sensor(bgp, i);
}
ti_bandgap_power(bgp, false);
if (TI_BANDGAP_HAS(bgp, CLK_CTRL))
clk_disable_unprepare(bgp->fclock);
clk_put(bgp->fclock);
clk_put(bgp->div_clk);
if (TI_BANDGAP_HAS(bgp, TALERT))
free_irq(bgp->irq, bgp);
if (TI_BANDGAP_HAS(bgp, TSHUT)) {
free_irq(gpio_to_irq(bgp->tshut_gpio), NULL);
gpio_free(bgp->tshut_gpio);
}
return 0;
}
static int ti_bandgap_save_ctxt(struct ti_bandgap *bgp)
{
int i;
for (i = 0; i < bgp->conf->sensor_count; i++) {
struct temp_sensor_registers *tsr;
struct temp_sensor_regval *rval;
rval = &bgp->regval[i];
tsr = bgp->conf->sensors[i].registers;
if (TI_BANDGAP_HAS(bgp, MODE_CONFIG))
rval->bg_mode_ctrl = ti_bandgap_readl(bgp,
tsr->bgap_mode_ctrl);
if (TI_BANDGAP_HAS(bgp, COUNTER))
rval->bg_counter = ti_bandgap_readl(bgp,
tsr->bgap_counter);
if (TI_BANDGAP_HAS(bgp, TALERT)) {
rval->bg_threshold = ti_bandgap_readl(bgp,
tsr->bgap_threshold);
rval->bg_ctrl = ti_bandgap_readl(bgp,
tsr->bgap_mask_ctrl);
}
if (TI_BANDGAP_HAS(bgp, TSHUT_CONFIG))
rval->tshut_threshold = ti_bandgap_readl(bgp,
tsr->tshut_threshold);
}
return 0;
}
/**
* ti_bandgap_read_temp() - helper function to read sensor temperature
* @bgp: pointer to ti_bandgap structure
* @id: bandgap sensor id
*
* Function to concentrate the steps to read sensor temperature register.
* This function is desired because, depending on bandgap device version,
* it might be needed to freeze the bandgap state machine, before fetching
* the register value.
*
* Return: temperature in ADC values.
*/
static u32 ti_bandgap_read_temp(struct ti_bandgap *bgp, int id)
{
struct temp_sensor_registers *tsr;
u32 temp, reg;
tsr = bgp->conf->sensors[id].registers;
reg = tsr->temp_sensor_ctrl;
if (TI_BANDGAP_HAS(bgp, FREEZE_BIT)) {
RMW_BITS(bgp, id, bgap_mask_ctrl, mask_freeze_mask, 1);
/*
* In case we cannot read from cur_dtemp / dtemp_0,
* then we read from the last valid temp read
*/
reg = tsr->ctrl_dtemp_1;
}
/* read temperature */
temp = ti_bandgap_readl(bgp, reg);
temp &= tsr->bgap_dtemp_mask;
if (TI_BANDGAP_HAS(bgp, FREEZE_BIT))
RMW_BITS(bgp, id, bgap_mask_ctrl, mask_freeze_mask, 0);
return temp;
}
/**
* ti_bandgap_get_trend() - To fetch the temperature trend of a sensor
* @bgp: pointer to struct ti_bandgap
* @id: id of the individual sensor
* @trend: Pointer to trend.
*
* This function needs to be called to fetch the temperature trend of a
* Particular sensor. The function computes the difference in temperature
* w.r.t time. For the bandgaps with built in history buffer the temperatures
* are read from the buffer and for those without the Buffer -ENOTSUPP is
* returned.
*
* Return: 0 if no error, else return corresponding error. If no
* error then the trend value is passed on to trend parameter
*/
int ti_bandgap_get_trend(struct ti_bandgap *bgp, int id, int *trend)
{
struct temp_sensor_registers *tsr;
u32 temp1, temp2, reg1, reg2;
int t1, t2, interval, ret = 0;
ret = ti_bandgap_validate(bgp, id);
if (ret)
goto exit;
if (!TI_BANDGAP_HAS(bgp, HISTORY_BUFFER) ||
!TI_BANDGAP_HAS(bgp, FREEZE_BIT)) {
ret = -ENOTSUPP;
goto exit;
}
tsr = bgp->conf->sensors[id].registers;
/* Freeze and read the last 2 valid readings */
reg1 = tsr->ctrl_dtemp_1;
reg2 = tsr->ctrl_dtemp_2;
/* read temperature from history buffer */
temp1 = ti_bandgap_readl(bgp, reg1);
temp1 &= tsr->bgap_dtemp_mask;
temp2 = ti_bandgap_readl(bgp, reg2);
temp2 &= tsr->bgap_dtemp_mask;
/* Convert from adc values to mCelsius temperature */
ret = ti_bandgap_adc_to_mcelsius(bgp, temp1, &t1);
if (ret)
goto exit;
ret = ti_bandgap_adc_to_mcelsius(bgp, temp2, &t2);
if (ret)
goto exit;
/* Fetch the update interval */
ret = ti_bandgap_read_update_interval(bgp, id, &interval);
if (ret || !interval)
goto exit;
*trend = (t1 - t2) / interval;
dev_dbg(bgp->dev, "The temperatures are t1 = %d and t2 = %d and trend =%d\n",
t1, t2, *trend);
exit:
return ret;
}
/**
* ti_bandgap_build() - parse DT and setup a struct ti_bandgap
* @pdev: pointer to device struct platform_device
*
* Used to read the device tree properties accordingly to the bandgap
* matching version. Based on bandgap version and its capabilities it
* will build a struct ti_bandgap out of the required DT entries.
*
* Return: valid bandgap structure if successful, else returns ERR_PTR
* return value must be verified with IS_ERR.
*/
static struct ti_bandgap *ti_bandgap_build(struct platform_device *pdev)
{
struct device_node *node = pdev->dev.of_node;
const struct of_device_id *of_id;
struct ti_bandgap *bgp;
struct resource *res;
int i;
/* just for the sake */
if (!node) {
dev_err(&pdev->dev, "no platform information available\n");
return ERR_PTR(-EINVAL);
}
bgp = devm_kzalloc(&pdev->dev, sizeof(*bgp), GFP_KERNEL);
if (!bgp) {
dev_err(&pdev->dev, "Unable to allocate mem for driver ref\n");
return ERR_PTR(-ENOMEM);
}
of_id = of_match_device(of_ti_bandgap_match, &pdev->dev);
if (of_id)
bgp->conf = of_id->data;
/* register shadow for context save and restore */
bgp->regval = devm_kzalloc(&pdev->dev, sizeof(*bgp->regval) *
bgp->conf->sensor_count, GFP_KERNEL);
if (!bgp) {
dev_err(&pdev->dev, "Unable to allocate mem for driver ref\n");
return ERR_PTR(-ENOMEM);
}
i = 0;
do {
void __iomem *chunk;
res = platform_get_resource(pdev, IORESOURCE_MEM, i);
if (!res)
break;
chunk = devm_ioremap_resource(&pdev->dev, res);
if (i == 0)
bgp->base = chunk;
if (IS_ERR(chunk))
return ERR_CAST(chunk);
i++;
} while (res);
if (TI_BANDGAP_HAS(bgp, TSHUT)) {
bgp->tshut_gpio = of_get_gpio(node, 0);
if (!gpio_is_valid(bgp->tshut_gpio)) {
dev_err(&pdev->dev, "invalid gpio for tshut (%d)\n",
bgp->tshut_gpio);
return ERR_PTR(-EINVAL);
}
}
return bgp;
}
static int ti_bandgap_resume(struct device *dev)
{
struct ti_bandgap *bgp = dev_get_drvdata(dev);
if (TI_BANDGAP_HAS(bgp, CLK_CTRL))
clk_prepare_enable(bgp->fclock);
ti_bandgap_power(bgp, true);
return ti_bandgap_restore_ctxt(bgp);
}
/**
* ti_bandgap_write_update_interval() - set the update interval
* @bgp: pointer to bandgap instance
* @id: sensor id
* @interval: desired update interval in miliseconds
*
* Return: 0 on success or the proper error code
*/
int ti_bandgap_write_update_interval(struct ti_bandgap *bgp,
int id, u32 interval)
{
int ret = ti_bandgap_validate(bgp, id);
if (ret)
goto exit;
if (!TI_BANDGAP_HAS(bgp, COUNTER) &&
!TI_BANDGAP_HAS(bgp, COUNTER_DELAY)) {
ret = -ENOTSUPP;
goto exit;
}
if (TI_BANDGAP_HAS(bgp, COUNTER)) {
ti_bandgap_write_counter(bgp, id, interval);
goto exit;
}
ret = ti_bandgap_write_counter_delay(bgp, id, interval);
exit:
return ret;
}
static int ti_bandgap_suspend(struct device *dev)
{
struct ti_bandgap *bgp = dev_get_drvdata(dev);
int err;
err = ti_bandgap_save_ctxt(bgp);
ti_bandgap_power(bgp, false);
if (TI_BANDGAP_HAS(bgp, CLK_CTRL))
clk_disable_unprepare(bgp->fclock);
return err;
}
static int ti_bandgap_restore_ctxt(struct ti_bandgap *bgp)
{
int i;
for (i = 0; i < bgp->conf->sensor_count; i++) {
struct temp_sensor_registers *tsr;
struct temp_sensor_regval *rval;
u32 val = 0;
rval = &bgp->regval[i];
tsr = bgp->conf->sensors[i].registers;
if (TI_BANDGAP_HAS(bgp, COUNTER))
val = ti_bandgap_readl(bgp, tsr->bgap_counter);
if (TI_BANDGAP_HAS(bgp, TSHUT_CONFIG))
ti_bandgap_writel(bgp, rval->tshut_threshold,
tsr->tshut_threshold);
/* Force immediate temperature measurement and update
* of the DTEMP field
*/
ti_bandgap_force_single_read(bgp, i);
if (TI_BANDGAP_HAS(bgp, COUNTER))
ti_bandgap_writel(bgp, rval->bg_counter,
tsr->bgap_counter);
if (TI_BANDGAP_HAS(bgp, MODE_CONFIG))
ti_bandgap_writel(bgp, rval->bg_mode_ctrl,
tsr->bgap_mode_ctrl);
if (TI_BANDGAP_HAS(bgp, TALERT)) {
ti_bandgap_writel(bgp, rval->bg_threshold,
tsr->bgap_threshold);
ti_bandgap_writel(bgp, rval->bg_ctrl,
tsr->bgap_mask_ctrl);
}
}
return 0;
}
/**
* ti_bandgap_power() - controls the power state of a bandgap device
* @bgp: pointer to ti_bandgap structure
* @on: desired power state (1 - on, 0 - off)
*
* Used to power on/off a bandgap device instance. Only used on those
* that features tempsoff bit.
*
* Return: 0 on success, -ENOTSUPP if tempsoff is not supported.
*/
static int ti_bandgap_power(struct ti_bandgap *bgp, bool on)
{
int i, ret = 0;
if (!TI_BANDGAP_HAS(bgp, POWER_SWITCH)) {
ret = -ENOTSUPP;
goto exit;
}
for (i = 0; i < bgp->conf->sensor_count; i++)
/* active on 0 */
RMW_BITS(bgp, i, temp_sensor_ctrl, bgap_tempsoff_mask, !on);
exit:
return ret;
}
/**
* _ti_bandgap_write_threshold() - helper to update TALERT t_cold or t_hot
* @bgp: struct ti_bandgap pointer
* @id: bandgap sensor id
* @val: value (mCelsius) of a new threshold
* @hot: desired threshold to be updated. true if threshold hot, false if
* threshold cold
*
* It will update the required thresholds (hot and cold) for TALERT signal.
* This function can be used to update t_hot or t_cold, depending on @hot value.
* Validates the mCelsius range and update the requested threshold.
* Call this function only if bandgap features HAS(TALERT).
*
* Return: 0 if no error, else corresponding error value.
*/
static int _ti_bandgap_write_threshold(struct ti_bandgap *bgp, int id, int val,
bool hot)
{
struct temp_sensor_data *ts_data;
struct temp_sensor_registers *tsr;
u32 adc_val;
int ret;
ret = ti_bandgap_validate(bgp, id);
if (ret)
goto exit;
if (!TI_BANDGAP_HAS(bgp, TALERT)) {
ret = -ENOTSUPP;
goto exit;
}
ts_data = bgp->conf->sensors[id].ts_data;
tsr = bgp->conf->sensors[id].registers;
if (hot) {
if (val < ts_data->min_temp + ts_data->hyst_val)
ret = -EINVAL;
} else {
if (val > ts_data->max_temp + ts_data->hyst_val)
ret = -EINVAL;
}
if (ret)
goto exit;
ret = ti_bandgap_mcelsius_to_adc(bgp, val, &adc_val);
if (ret < 0)
goto exit;
spin_lock(&bgp->lock);
ret = ti_bandgap_update_alert_threshold(bgp, id, adc_val, hot);
spin_unlock(&bgp->lock);
exit:
return ret;
}
/**
* ti_bandgap_force_single_read() - executes 1 single ADC conversion
* @bgp: pointer to struct ti_bandgap
* @id: sensor id which it is desired to read 1 temperature
*
* Used to initialize the conversion state machine and set it to a valid
* state. Called during device initialization and context restore events.
*
* Return: 0
*/
static int
ti_bandgap_force_single_read(struct ti_bandgap *bgp, int id)
{
u32 temp = 0, counter = 1000;
/* Select single conversion mode */
if (TI_BANDGAP_HAS(bgp, MODE_CONFIG))
RMW_BITS(bgp, id, bgap_mode_ctrl, mode_ctrl_mask, 0);
/* Start of Conversion = 1 */
RMW_BITS(bgp, id, temp_sensor_ctrl, bgap_soc_mask, 1);
/* Wait until DTEMP is updated */
temp = ti_bandgap_read_temp(bgp, id);
while ((temp == 0) && --counter)
temp = ti_bandgap_read_temp(bgp, id);
/* REVISIT: Check correct condition for end of conversion */
/* Start of Conversion = 0 */
RMW_BITS(bgp, id, temp_sensor_ctrl, bgap_soc_mask, 0);
return 0;
}
/**
* _ti_bandgap_read_threshold() - helper to read TALERT t_cold or t_hot
* @bgp: struct ti_bandgap pointer
* @id: bandgap sensor id
* @val: value (mCelsius) of a threshold
* @hot: desired threshold to be read. true if threshold hot, false if
* threshold cold
*
* It will fetch the required thresholds (hot and cold) for TALERT signal.
* This function can be used to read t_hot or t_cold, depending on @hot value.
* Call this function only if bandgap features HAS(TALERT).
*
* Return: 0 if no error, -ENOTSUPP if it has no TALERT support, or the
* corresponding error value if some operation fails.
*/
static int _ti_bandgap_read_threshold(struct ti_bandgap *bgp, int id,
int *val, bool hot)
{
struct temp_sensor_registers *tsr;
u32 temp, mask;
int ret = 0;
ret = ti_bandgap_validate(bgp, id);
if (ret)
goto exit;
if (!TI_BANDGAP_HAS(bgp, TALERT)) {
ret = -ENOTSUPP;
goto exit;
}
tsr = bgp->conf->sensors[id].registers;
if (hot)
mask = tsr->threshold_thot_mask;
else
mask = tsr->threshold_tcold_mask;
temp = ti_bandgap_readl(bgp, tsr->bgap_threshold);
temp = (temp & mask) >> __ffs(mask);
ret |= ti_bandgap_adc_to_mcelsius(bgp, temp, &temp);
if (ret) {
dev_err(bgp->dev, "failed to read thot\n");
ret = -EIO;
goto exit;
}
*val = temp;
exit:
return ret;
}
static
int ti_bandgap_probe(struct platform_device *pdev)
{
struct ti_bandgap *bgp;
int clk_rate, ret = 0, i;
bgp = ti_bandgap_build(pdev);
if (IS_ERR(bgp)) {
dev_err(&pdev->dev, "failed to fetch platform data\n");
return PTR_ERR(bgp);
}
bgp->dev = &pdev->dev;
if (TI_BANDGAP_HAS(bgp, TSHUT)) {
ret = ti_bandgap_tshut_init(bgp, pdev);
if (ret) {
dev_err(&pdev->dev,
"failed to initialize system tshut IRQ\n");
return ret;
}
}
bgp->fclock = clk_get(NULL, bgp->conf->fclock_name);
ret = IS_ERR(bgp->fclock);
if (ret) {
dev_err(&pdev->dev, "failed to request fclock reference\n");
ret = PTR_ERR(bgp->fclock);
goto free_irqs;
}
bgp->div_clk = clk_get(NULL, bgp->conf->div_ck_name);
ret = IS_ERR(bgp->div_clk);
if (ret) {
dev_err(&pdev->dev,
"failed to request div_ts_ck clock ref\n");
ret = PTR_ERR(bgp->div_clk);
goto free_irqs;
}
for (i = 0; i < bgp->conf->sensor_count; i++) {
struct temp_sensor_registers *tsr;
u32 val;
tsr = bgp->conf->sensors[i].registers;
/*
* check if the efuse has a non-zero value if not
* it is an untrimmed sample and the temperatures
* may not be accurate
*/
val = ti_bandgap_readl(bgp, tsr->bgap_efuse);
if (ret || !val)
dev_info(&pdev->dev,
"Non-trimmed BGAP, Temp not accurate\n");
}
clk_rate = clk_round_rate(bgp->div_clk,
bgp->conf->sensors[0].ts_data->max_freq);
if (clk_rate < bgp->conf->sensors[0].ts_data->min_freq ||
clk_rate == 0xffffffff) {
ret = -ENODEV;
dev_err(&pdev->dev, "wrong clock rate (%d)\n", clk_rate);
goto put_clks;
}
ret = clk_set_rate(bgp->div_clk, clk_rate);
if (ret)
dev_err(&pdev->dev, "Cannot re-set clock rate. Continuing\n");
bgp->clk_rate = clk_rate;
if (TI_BANDGAP_HAS(bgp, CLK_CTRL))
clk_prepare_enable(bgp->fclock);
spin_lock_init(&bgp->lock);
bgp->dev = &pdev->dev;
platform_set_drvdata(pdev, bgp);
ti_bandgap_power(bgp, true);
/* Set default counter to 1 for now */
if (TI_BANDGAP_HAS(bgp, COUNTER))
for (i = 0; i < bgp->conf->sensor_count; i++)
RMW_BITS(bgp, i, bgap_counter, counter_mask, 1);
/* Set default thresholds for alert and shutdown */
for (i = 0; i < bgp->conf->sensor_count; i++) {
struct temp_sensor_data *ts_data;
ts_data = bgp->conf->sensors[i].ts_data;
if (TI_BANDGAP_HAS(bgp, TALERT)) {
/* Set initial Talert thresholds */
RMW_BITS(bgp, i, bgap_threshold,
threshold_tcold_mask, ts_data->t_cold);
RMW_BITS(bgp, i, bgap_threshold,
threshold_thot_mask, ts_data->t_hot);
/* Enable the alert events */
RMW_BITS(bgp, i, bgap_mask_ctrl, mask_hot_mask, 1);
RMW_BITS(bgp, i, bgap_mask_ctrl, mask_cold_mask, 1);
}
if (TI_BANDGAP_HAS(bgp, TSHUT_CONFIG)) {
/* Set initial Tshut thresholds */
RMW_BITS(bgp, i, tshut_threshold,
tshut_hot_mask, ts_data->tshut_hot);
RMW_BITS(bgp, i, tshut_threshold,
tshut_cold_mask, ts_data->tshut_cold);
}
}
if (TI_BANDGAP_HAS(bgp, MODE_CONFIG))
ti_bandgap_set_continuous_mode(bgp);
/* Set .250 seconds time as default counter */
if (TI_BANDGAP_HAS(bgp, COUNTER))
for (i = 0; i < bgp->conf->sensor_count; i++)
RMW_BITS(bgp, i, bgap_counter, counter_mask,
bgp->clk_rate / 4);
/* Every thing is good? Then expose the sensors */
for (i = 0; i < bgp->conf->sensor_count; i++) {
char *domain;
if (bgp->conf->sensors[i].register_cooling) {
ret = bgp->conf->sensors[i].register_cooling(bgp, i);
if (ret)
goto remove_sensors;
}
if (bgp->conf->expose_sensor) {
domain = bgp->conf->sensors[i].domain;
ret = bgp->conf->expose_sensor(bgp, i, domain);
if (ret)
goto remove_last_cooling;
}
}
/*
* Enable the Interrupts once everything is set. Otherwise irq handler
* might be called as soon as it is enabled where as rest of framework
* is still getting initialised.
*/
if (TI_BANDGAP_HAS(bgp, TALERT)) {
ret = ti_bandgap_talert_init(bgp, pdev);
if (ret) {
dev_err(&pdev->dev, "failed to initialize Talert IRQ\n");
i = bgp->conf->sensor_count;
goto disable_clk;
}
}
return 0;
remove_last_cooling:
if (bgp->conf->sensors[i].unregister_cooling)
bgp->conf->sensors[i].unregister_cooling(bgp, i);
remove_sensors:
for (i--; i >= 0; i--) {
if (bgp->conf->sensors[i].unregister_cooling)
bgp->conf->sensors[i].unregister_cooling(bgp, i);
if (bgp->conf->remove_sensor)
bgp->conf->remove_sensor(bgp, i);
}
ti_bandgap_power(bgp, false);
disable_clk:
if (TI_BANDGAP_HAS(bgp, CLK_CTRL))
clk_disable_unprepare(bgp->fclock);
put_clks:
clk_put(bgp->fclock);
clk_put(bgp->div_clk);
free_irqs:
if (TI_BANDGAP_HAS(bgp, TSHUT)) {
free_irq(gpio_to_irq(bgp->tshut_gpio), NULL);
gpio_free(bgp->tshut_gpio);
}
return ret;
}