In some PMICs like pmi632, the pattern look up table (LUT) and LPG
configuration is stored in a single SDAM module instead of LUT
peripheral. This feature is called PPG. PPG uses Qualcomm Programmable
Boot Sequencer (PBS) inorder to trigger pattern sequences for PMICs.
Signed-off-by: Anjelique Melendez <quic_amelende@xxxxxxxxxxx>
Tested-by: Luca Weiss <luca.weiss@xxxxxxxxxxxxx>
---
drivers/leds/rgb/leds-qcom-lpg.c | 268 ++++++++++++++++++++++++++++---
1 file changed, 244 insertions(+), 24 deletions(-)
diff --git a/drivers/leds/rgb/leds-qcom-lpg.c b/drivers/leds/rgb/leds-qcom-lpg.c
index 68d82a682bf6..a76cb1d6b7b5 100644
--- a/drivers/leds/rgb/leds-qcom-lpg.c
+++ b/drivers/leds/rgb/leds-qcom-lpg.c
@@ -8,11 +8,13 @@
#include <linux/bitfield.h>
#include <linux/led-class-multicolor.h>
#include <linux/module.h>
+#include <linux/nvmem-consumer.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pwm.h>
#include <linux/regmap.h>
#include <linux/slab.h>
+#include <linux/soc/qcom/qcom-pbs.h>
#define LPG_SUBTYPE_REG 0x05
#define LPG_SUBTYPE_LPG 0x2
@@ -39,6 +41,8 @@
#define PWM_SEC_ACCESS_REG 0xd0
#define PWM_DTEST_REG(x) (0xe2 + (x) - 1)
+#define SDAM_REG_PBS_SEQ_EN 0x42
+
#define TRI_LED_SRC_SEL 0x45
#define TRI_LED_EN_CTL 0x46
#define TRI_LED_ATC_CTL 0x47
@@ -48,9 +52,25 @@
#define LPG_RESOLUTION_9BIT BIT(9)
#define LPG_RESOLUTION_15BIT BIT(15)
+#define PPG_MAX_LED_BRIGHTNESS 255
+
#define LPG_MAX_M 7
#define LPG_MAX_PREDIV 6
+#define DEFAULT_TICK_DURATION_US 7800
+#define RAMP_STEP_DURATION(x) (((x) * 1000 / DEFAULT_TICK_DURATION_US) & 0xff)
+
+/* LPG common config settings for PPG */
+#define SDAM_REG_RAMP_STEP_DURATION 0x47
+#define SDAM_LPG_SDAM_LUT_PATTERN_OFFSET 0x80
+
+/* LPG per channel config settings for PPG */
+#define SDAM_LUT_EN_OFFSET 0x0
+#define SDAM_PATTERN_CONFIG_OFFSET 0x1
+#define SDAM_END_INDEX_OFFSET 0x3
+#define SDAM_START_INDEX_OFFSET 0x4
+#define SDAM_PBS_SCRATCH_LUT_COUNTER_OFFSET 0x6
+
struct lpg_channel;
struct lpg_data;
@@ -64,6 +84,9 @@ struct lpg_data;
* @lut_base: base address of the LUT block (optional)
* @lut_size: number of entries in the LUT block
* @lut_bitmap: allocation bitmap for LUT entries
+ * @pbs_dev: PBS device
+ * @lpg_chan_sdam: LPG SDAM peripheral device
+ * @pbs_en_bitmap: bitmap for tracking PBS triggers
* @triled_base: base address of the TRILED block (optional)
* @triled_src: power-source for the TRILED
* @triled_has_atc_ctl: true if there is TRI_LED_ATC_CTL register
@@ -85,6 +108,10 @@ struct lpg {
u32 lut_size;
unsigned long *lut_bitmap;
+ struct pbs_dev *pbs_dev;
+ struct nvmem_device *lpg_chan_sdam;
+ unsigned long pbs_en_bitmap;
+
u32 triled_base;
u32 triled_src;
bool triled_has_atc_ctl;
@@ -101,6 +128,7 @@ struct lpg {
* @triled_mask: mask in TRILED to enable this channel
* @lut_mask: mask in LUT to start pattern generator for this channel
* @subtype: PMIC hardware block subtype
+ * @sdam_offset: channel offset in LPG SDAM
* @in_use: channel is exposed to LED framework
* @color: color of the LED attached to this channel
* @dtest_line: DTEST line for output, or 0 if disabled
@@ -129,6 +157,7 @@ struct lpg_channel {
unsigned int triled_mask;
unsigned int lut_mask;
unsigned int subtype;
+ u32 sdam_offset;
bool in_use;
@@ -178,10 +207,12 @@ struct lpg_led {
/**
* struct lpg_channel_data - per channel initialization data
+ * @sdam_offset: Channel offset in LPG SDAM
* @base: base address for PWM channel registers
* @triled_mask: bitmask for controlling this channel in TRILED
*/
struct lpg_channel_data {
+ unsigned int sdam_offset;
unsigned int base;
u8 triled_mask;
};
@@ -206,6 +237,52 @@ struct lpg_data {
const struct lpg_channel_data *channels;
};
+#define PBS_SW_TRIG_BIT BIT(0)
+
+static int lpg_clear_pbs_trigger(struct lpg *lpg, unsigned int lut_mask)
+{
+ u8 val = 0;
+ int rc;
+
+ lpg->pbs_en_bitmap &= (~lut_mask);
+ if (!lpg->pbs_en_bitmap) {
+ rc = nvmem_device_write(lpg->lpg_chan_sdam, SDAM_REG_PBS_SEQ_EN, 1, &val);
+ if (rc < 0)
+ return rc;
+ }
+
+ return 0;
+}
+
+static int lpg_set_pbs_trigger(struct lpg *lpg, unsigned int lut_mask)
+{
+ u8 val = PBS_SW_TRIG_BIT;
+ int rc;
+
+ if (!lpg->pbs_en_bitmap) {
+ rc = nvmem_device_write(lpg->lpg_chan_sdam, SDAM_REG_PBS_SEQ_EN, 1, &val);
+ if (rc < 0)
+ return rc;
+
+ rc = qcom_pbs_trigger_event(lpg->pbs_dev, val);
+ if (rc < 0)
+ return rc;
+ }
+ lpg->pbs_en_bitmap |= lut_mask;
+
+ return 0;
+}
+
+static int lpg_sdam_configure_triggers(struct lpg_channel *chan, u8 set_trig)
+{
+ u32 addr = SDAM_LUT_EN_OFFSET + chan->sdam_offset;
+
+ if (!chan->lpg->lpg_chan_sdam)
+ return 0;
+
+ return nvmem_device_write(chan->lpg->lpg_chan_sdam, addr, 1, &set_trig);
+}
+
static int triled_set(struct lpg *lpg, unsigned int mask, unsigned int enable)
{
/* Skip if we don't have a triled block */
@@ -216,6 +293,40 @@ static int triled_set(struct lpg *lpg, unsigned int mask, unsigned int enable)
mask, enable);
}
+static int lpg_lut_store_sdam(struct lpg *lpg, struct led_pattern *pattern,
+ size_t len, unsigned int *lo_idx, unsigned int *hi_idx)
+{
+ unsigned int idx;
+ u8 brightness;
+ int i, rc;
+ u16 addr;
+
+ if (len > lpg->lut_size) {
+ dev_err(lpg->dev, "Pattern length (%zu) exceeds maximum pattern length (%d)\n",
+ len, lpg->lut_size);
+ return -EINVAL;
+ }
+
+ idx = bitmap_find_next_zero_area(lpg->lut_bitmap, lpg->lut_size, 0, len, 0);
+ if (idx >= lpg->lut_size)
+ return -ENOSPC;
+
+ for (i = 0; i < len; i++) {
+ brightness = pattern[i].brightness;
+ addr = SDAM_LPG_SDAM_LUT_PATTERN_OFFSET + i + idx;
+ rc = nvmem_device_write(lpg->lpg_chan_sdam, addr, 1, &brightness);
+ if (rc < 0)
+ return rc;
+ }
+
+ bitmap_set(lpg->lut_bitmap, idx, len);
+
+ *lo_idx = idx;
+ *hi_idx = idx + len - 1;
+
+ return 0;
+}
+
static int lpg_lut_store(struct lpg *lpg, struct led_pattern *pattern,
size_t len, unsigned int *lo_idx, unsigned int *hi_idx)
{
@@ -256,6 +367,9 @@ static void lpg_lut_free(struct lpg *lpg, unsigned int lo_idx, unsigned int hi_i
static int lpg_lut_sync(struct lpg *lpg, unsigned int mask)
{
+ if (!lpg->lut_base)
+ return 0;
+
return regmap_write(lpg->map, lpg->lut_base + RAMP_CONTROL_REG, mask);
}
@@ -462,6 +576,28 @@ static void lpg_apply_pwm_value(struct lpg_channel *chan)
#define LPG_PATTERN_CONFIG_PAUSE_HI BIT(1)
#define LPG_PATTERN_CONFIG_PAUSE_LO BIT(0)
+static void lpg_sdam_apply_lut_control(struct lpg_channel *chan)
+{
+ struct nvmem_device *lpg_chan_sdam = chan->lpg->lpg_chan_sdam;
+ unsigned int lo_idx = chan->pattern_lo_idx;
+ unsigned int hi_idx = chan->pattern_hi_idx;
+ u8 val = 0, conf = 0;
+
+ if (!chan->ramp_enabled || chan->pattern_lo_idx == chan->pattern_hi_idx)
+ return;
+
+ if (!chan->ramp_oneshot)
+ conf |= LPG_PATTERN_CONFIG_REPEAT;
+
+ nvmem_device_write(lpg_chan_sdam, SDAM_PBS_SCRATCH_LUT_COUNTER_OFFSET + chan->sdam_offset, 1, &val);
+ nvmem_device_write(lpg_chan_sdam, SDAM_PATTERN_CONFIG_OFFSET + chan->sdam_offset, 1, &conf);
+ nvmem_device_write(lpg_chan_sdam, SDAM_END_INDEX_OFFSET + chan->sdam_offset, 1, &hi_idx);
+ nvmem_device_write(lpg_chan_sdam, SDAM_START_INDEX_OFFSET + chan->sdam_offset, 1, &lo_idx);
+
+ val = RAMP_STEP_DURATION(chan->ramp_tick_ms);
+ nvmem_device_write(lpg_chan_sdam, SDAM_REG_RAMP_STEP_DURATION, 1, &val);
+}
+
static void lpg_apply_lut_control(struct lpg_channel *chan)
{
struct lpg *lpg = chan->lpg;
@@ -597,7 +733,10 @@ static void lpg_apply(struct lpg_channel *chan)
lpg_apply_pwm_value(chan);
lpg_apply_control(chan);
lpg_apply_sync(chan);
- lpg_apply_lut_control(chan);
+ if (chan->lpg->lpg_chan_sdam)
+ lpg_sdam_apply_lut_control(chan);
+ else
+ lpg_apply_lut_control(chan);
lpg_enable_glitch(chan);
}
@@ -622,6 +761,7 @@ static void lpg_brightness_set(struct lpg_led *led, struct led_classdev *cdev,
chan->ramp_enabled = false;
} else if (chan->pattern_lo_idx != chan->pattern_hi_idx) {
lpg_calc_freq(chan, NSEC_PER_MSEC);
+ lpg_sdam_configure_triggers(chan, 1);
chan->enabled = true;
chan->ramp_enabled = true;
@@ -649,8 +789,10 @@ static void lpg_brightness_set(struct lpg_led *led, struct led_classdev *cdev,
triled_set(lpg, triled_mask, triled_enabled);
/* Trigger start of ramp generator(s) */
- if (lut_mask)
+ if (lut_mask) {
lpg_lut_sync(lpg, lut_mask);
+ lpg_set_pbs_trigger(lpg, lut_mask);
+ }
}
static int lpg_brightness_single_set(struct led_classdev *cdev,
@@ -767,9 +909,9 @@ static int lpg_pattern_set(struct lpg_led *led, struct led_pattern *led_pattern,
struct led_pattern *pattern;
unsigned int brightness_a;
unsigned int brightness_b;
+ unsigned int hi_pause = 0;
+ unsigned int lo_pause = 0;
unsigned int actual_len;
- unsigned int hi_pause;
- unsigned int lo_pause;
unsigned int delta_t;
unsigned int lo_idx;
unsigned int hi_idx;
@@ -836,18 +978,23 @@ static int lpg_pattern_set(struct lpg_led *led, struct led_pattern *led_pattern,
* If the specified pattern is a palindrome the ping pong mode is
* enabled. In this scenario the delta_t of the middle entry (i.e. the
* last in the programmed pattern) determines the "high pause".
+ *
+ * SDAM-based devices do not support "ping-pong", "low pause" or "high pause"
*/
/* Detect palindromes and use "ping pong" to reduce LUT usage */
- for (i = 0; i < len / 2; i++) {
- brightness_a = pattern[i].brightness;
- brightness_b = pattern[len - i - 1].brightness;
-
- if (brightness_a != brightness_b) {
- ping_pong = false;
- break;
+ if (lpg->lut_base) {
+ for (i = 0; i < len / 2; i++) {
+ brightness_a = pattern[i].brightness;
+ brightness_b = pattern[len - i - 1].brightness;
+
+ if (brightness_a != brightness_b) {
+ ping_pong = false;
+ break;
+ }
}
- }
+ } else
+ ping_pong = false;
/* The pattern length to be written to the LUT */
if (ping_pong)
@@ -875,12 +1022,26 @@ static int lpg_pattern_set(struct lpg_led *led, struct led_pattern *led_pattern,
if (delta_t >= BIT(9))
goto out_free_pattern;
- /* Find "low pause" and "high pause" in the pattern */
- lo_pause = pattern[0].delta_t;
- hi_pause = pattern[actual_len - 1].delta_t;
+ /*
+ * Find "low pause" and "high pause" in the pattern in the LUT case.
+ * SDAM-based devices require equal duration of all steps
+ */
+ if (lpg->lut_base) {
+ lo_pause = pattern[0].delta_t;
+ hi_pause = pattern[actual_len - 1].delta_t;
+ } else {
+ if (delta_t != pattern[0].delta_t || delta_t != pattern[actual_len - 1].delta_t)
+ goto out_free_pattern;
+ }
+
mutex_lock(&lpg->lock);
- ret = lpg_lut_store(lpg, pattern, actual_len, &lo_idx, &hi_idx);
+
+ if (lpg->lut_base)
+ ret = lpg_lut_store(lpg, pattern, actual_len, &lo_idx, &hi_idx);
+ else
+ ret = lpg_lut_store_sdam(lpg, pattern, actual_len, &lo_idx, &hi_idx);
+
if (ret < 0)
goto out_unlock;
@@ -928,7 +1089,12 @@ static int lpg_pattern_mc_set(struct led_classdev *cdev,
{
struct led_classdev_mc *mc = lcdev_to_mccdev(cdev);
struct lpg_led *led = container_of(mc, struct lpg_led, mcdev);
- int ret;
+ unsigned int triled_mask = 0;
+ int ret, i;
+
+ for (i = 0; i < led->num_channels; i++)
+ triled_mask |= led->channels[i]->triled_mask;
+ triled_set(led->lpg, triled_mask, 0);
ret = lpg_pattern_set(led, pattern, len, repeat);
if (ret < 0)
@@ -953,6 +1119,8 @@ static int lpg_pattern_clear(struct lpg_led *led)
for (i = 0; i < led->num_channels; i++) {
chan = led->channels[i];
+ lpg_sdam_configure_triggers(chan, 0);
+ lpg_clear_pbs_trigger(chan->lpg, chan->lut_mask);
chan->pattern_lo_idx = 0;
chan->pattern_hi_idx = 0;
}
@@ -1187,8 +1355,8 @@ static int lpg_add_led(struct lpg *lpg, struct device_node *np)
cdev->brightness_set_blocking = lpg_brightness_mc_set;
cdev->blink_set = lpg_blink_mc_set;
- /* Register pattern accessors only if we have a LUT block */
- if (lpg->lut_base) {
+ /* Register pattern accessors if we have a LUT block or when using PPG */
+ if (lpg->lut_base || lpg->lpg_chan_sdam) {
cdev->pattern_set = lpg_pattern_mc_set;
cdev->pattern_clear = lpg_pattern_mc_clear;
}
@@ -1201,15 +1369,19 @@ static int lpg_add_led(struct lpg *lpg, struct device_node *np)
cdev->brightness_set_blocking = lpg_brightness_single_set;
cdev->blink_set = lpg_blink_single_set;
- /* Register pattern accessors only if we have a LUT block */
- if (lpg->lut_base) {
+ /* Register pattern accessors if we have a LUT block or when using PPG */
+ if (lpg->lut_base || lpg->lpg_chan_sdam) {
cdev->pattern_set = lpg_pattern_single_set;
cdev->pattern_clear = lpg_pattern_single_clear;
}
}
cdev->default_trigger = of_get_property(np, "linux,default-trigger", NULL);
- cdev->max_brightness = LPG_RESOLUTION_9BIT - 1;
+
+ if (lpg->lpg_chan_sdam)
+ cdev->max_brightness = PPG_MAX_LED_BRIGHTNESS;
+ else
+ cdev->max_brightness = LPG_RESOLUTION_9BIT - 1;
if (!of_property_read_string(np, "default-state", &state) &&
!strcmp(state, "on"))
@@ -1250,6 +1422,7 @@ static int lpg_init_channels(struct lpg *lpg)
chan->base = data->channels[i].base;
chan->triled_mask = data->channels[i].triled_mask;
chan->lut_mask = BIT(i);
+ chan->sdam_offset = data->channels[i].sdam_offset;
regmap_read(lpg->map, chan->base + LPG_SUBTYPE_REG, &chan->subtype);
}
@@ -1296,11 +1469,12 @@ static int lpg_init_lut(struct lpg *lpg)
{
const struct lpg_data *data = lpg->data;
- if (!data->lut_base)
+ if (!data->lut_size)
return 0;
- lpg->lut_base = data->lut_base;
lpg->lut_size = data->lut_size;
+ if (data->lut_base)
+ lpg->lut_base = data->lut_base;
lpg->lut_bitmap = devm_bitmap_zalloc(lpg->dev, lpg->lut_size, GFP_KERNEL);
if (!lpg->lut_bitmap)
@@ -1309,6 +1483,48 @@ static int lpg_init_lut(struct lpg *lpg)
return 0;
}
+static int lpg_init_sdam(struct lpg *lpg)
+{
+ int i, sdam_count, rc;
+ u8 val = 0;
+
+ sdam_count = of_property_count_strings(lpg->dev->of_node, "nvmem-names");
+ if (sdam_count <= 0)
+ return 0;
+
+ /* Get the SDAM device for LPG/LUT config */
+ lpg->lpg_chan_sdam = devm_nvmem_device_get(lpg->dev, "lpg_chan_sdam");
+ if (IS_ERR(lpg->lpg_chan_sdam))
+ return dev_err_probe(lpg->dev, PTR_ERR(lpg->lpg_chan_sdam),
+ "Failed to get LPG chan SDAM device\n");
+
+ lpg->pbs_dev = get_pbs_client_device(lpg->dev);
+ if (IS_ERR(lpg->pbs_dev))
+ return dev_err_probe(lpg->dev, PTR_ERR(lpg->pbs_dev),
+ "Failed to get PBS client device\n");
+
+ for (i = 0; i < lpg->num_channels; i++) {
+ struct lpg_channel *chan = &lpg->channels[i];
+
+ if (chan->sdam_offset) {
+ rc = nvmem_device_write(lpg->lpg_chan_sdam,
+ SDAM_PBS_SCRATCH_LUT_COUNTER_OFFSET + chan->sdam_offset, 1, &val);
+ if (rc < 0)
+ return rc;
+
+ rc = lpg_sdam_configure_triggers(chan, 0);
+ if (rc < 0)
+ return rc;
+
+ rc = lpg_clear_pbs_trigger(chan->lpg, chan->lut_mask);
+ if (rc < 0)
+ return rc;
+ }
+ }
+
+ return 0;
+}
+
static int lpg_probe(struct platform_device *pdev)
{
struct device_node *np;
@@ -1345,6 +1561,10 @@ static int lpg_probe(struct platform_device *pdev)
if (ret < 0)
return ret;
+ ret = lpg_init_sdam(lpg);
+ if (ret < 0)
+ return ret;
+
ret = lpg_init_lut(lpg);
if (ret < 0)
return ret;
--
2.41.0
