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-rw-r--r--drivers/counter/Kconfig11
-rw-r--r--drivers/counter/Makefile1
-rw-r--r--drivers/counter/microchip-tcb-capture.c397
3 files changed, 409 insertions, 0 deletions
diff --git a/drivers/counter/Kconfig b/drivers/counter/Kconfig
index c80fa76bb531..2de53ab0dd25 100644
--- a/drivers/counter/Kconfig
+++ b/drivers/counter/Kconfig
@@ -70,4 +70,15 @@ config FTM_QUADDEC
To compile this driver as a module, choose M here: the
module will be called ftm-quaddec.
+config MICROCHIP_TCB_CAPTURE
+ tristate "Microchip Timer Counter Capture driver"
+ depends on HAS_IOMEM && OF
+ select REGMAP_MMIO
+ help
+ Select this option to enable the Microchip Timer Counter Block
+ capture driver.
+
+ To compile this driver as a module, choose M here: the
+ module will be called microchip-tcb-capture.
+
endif # COUNTER
diff --git a/drivers/counter/Makefile b/drivers/counter/Makefile
index 55142d1f4c43..0a393f71e481 100644
--- a/drivers/counter/Makefile
+++ b/drivers/counter/Makefile
@@ -10,3 +10,4 @@ obj-$(CONFIG_STM32_TIMER_CNT) += stm32-timer-cnt.o
obj-$(CONFIG_STM32_LPTIMER_CNT) += stm32-lptimer-cnt.o
obj-$(CONFIG_TI_EQEP) += ti-eqep.o
obj-$(CONFIG_FTM_QUADDEC) += ftm-quaddec.o
+obj-$(CONFIG_MICROCHIP_TCB_CAPTURE) += microchip-tcb-capture.o
diff --git a/drivers/counter/microchip-tcb-capture.c b/drivers/counter/microchip-tcb-capture.c
new file mode 100644
index 000000000000..f7b7743ddb94
--- /dev/null
+++ b/drivers/counter/microchip-tcb-capture.c
@@ -0,0 +1,397 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/**
+ * Copyright (C) 2020 Microchip
+ *
+ * Author: Kamel Bouhara <kamel.bouhara@bootlin.com>
+ */
+#include <linux/clk.h>
+#include <linux/counter.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <soc/at91/atmel_tcb.h>
+
+#define ATMEL_TC_CMR_MASK (ATMEL_TC_LDRA_RISING | ATMEL_TC_LDRB_FALLING | \
+ ATMEL_TC_ETRGEDG_RISING | ATMEL_TC_LDBDIS | \
+ ATMEL_TC_LDBSTOP)
+
+#define ATMEL_TC_QDEN BIT(8)
+#define ATMEL_TC_POSEN BIT(9)
+
+struct mchp_tc_data {
+ const struct atmel_tcb_config *tc_cfg;
+ struct counter_device counter;
+ struct regmap *regmap;
+ int qdec_mode;
+ int num_channels;
+ int channel[2];
+ bool trig_inverted;
+};
+
+enum mchp_tc_count_function {
+ MCHP_TC_FUNCTION_INCREASE,
+ MCHP_TC_FUNCTION_QUADRATURE,
+};
+
+static enum counter_count_function mchp_tc_count_functions[] = {
+ [MCHP_TC_FUNCTION_INCREASE] = COUNTER_COUNT_FUNCTION_INCREASE,
+ [MCHP_TC_FUNCTION_QUADRATURE] = COUNTER_COUNT_FUNCTION_QUADRATURE_X4,
+};
+
+enum mchp_tc_synapse_action {
+ MCHP_TC_SYNAPSE_ACTION_NONE = 0,
+ MCHP_TC_SYNAPSE_ACTION_RISING_EDGE,
+ MCHP_TC_SYNAPSE_ACTION_FALLING_EDGE,
+ MCHP_TC_SYNAPSE_ACTION_BOTH_EDGE
+};
+
+static enum counter_synapse_action mchp_tc_synapse_actions[] = {
+ [MCHP_TC_SYNAPSE_ACTION_NONE] = COUNTER_SYNAPSE_ACTION_NONE,
+ [MCHP_TC_SYNAPSE_ACTION_RISING_EDGE] = COUNTER_SYNAPSE_ACTION_RISING_EDGE,
+ [MCHP_TC_SYNAPSE_ACTION_FALLING_EDGE] = COUNTER_SYNAPSE_ACTION_FALLING_EDGE,
+ [MCHP_TC_SYNAPSE_ACTION_BOTH_EDGE] = COUNTER_SYNAPSE_ACTION_BOTH_EDGES,
+};
+
+static struct counter_signal mchp_tc_count_signals[] = {
+ {
+ .id = 0,
+ .name = "Channel A",
+ },
+ {
+ .id = 1,
+ .name = "Channel B",
+ }
+};
+
+static struct counter_synapse mchp_tc_count_synapses[] = {
+ {
+ .actions_list = mchp_tc_synapse_actions,
+ .num_actions = ARRAY_SIZE(mchp_tc_synapse_actions),
+ .signal = &mchp_tc_count_signals[0]
+ },
+ {
+ .actions_list = mchp_tc_synapse_actions,
+ .num_actions = ARRAY_SIZE(mchp_tc_synapse_actions),
+ .signal = &mchp_tc_count_signals[1]
+ }
+};
+
+static int mchp_tc_count_function_get(struct counter_device *counter,
+ struct counter_count *count,
+ size_t *function)
+{
+ struct mchp_tc_data *const priv = counter->priv;
+
+ if (priv->qdec_mode)
+ *function = MCHP_TC_FUNCTION_QUADRATURE;
+ else
+ *function = MCHP_TC_FUNCTION_INCREASE;
+
+ return 0;
+}
+
+static int mchp_tc_count_function_set(struct counter_device *counter,
+ struct counter_count *count,
+ size_t function)
+{
+ struct mchp_tc_data *const priv = counter->priv;
+ u32 bmr, cmr;
+
+ regmap_read(priv->regmap, ATMEL_TC_BMR, &bmr);
+ regmap_read(priv->regmap, ATMEL_TC_REG(priv->channel[0], CMR), &cmr);
+
+ /* Set capture mode */
+ cmr &= ~ATMEL_TC_WAVE;
+
+ switch (function) {
+ case MCHP_TC_FUNCTION_INCREASE:
+ priv->qdec_mode = 0;
+ /* Set highest rate based on whether soc has gclk or not */
+ bmr &= ~(ATMEL_TC_QDEN | ATMEL_TC_POSEN);
+ if (priv->tc_cfg->has_gclk)
+ cmr |= ATMEL_TC_TIMER_CLOCK2;
+ else
+ cmr |= ATMEL_TC_TIMER_CLOCK1;
+ /* Setup the period capture mode */
+ cmr |= ATMEL_TC_CMR_MASK;
+ cmr &= ~(ATMEL_TC_ABETRG | ATMEL_TC_XC0);
+ break;
+ case MCHP_TC_FUNCTION_QUADRATURE:
+ if (!priv->tc_cfg->has_qdec)
+ return -EINVAL;
+ /* In QDEC mode settings both channels 0 and 1 are required */
+ if (priv->num_channels < 2 || priv->channel[0] != 0 ||
+ priv->channel[1] != 1) {
+ pr_err("Invalid channels number or id for quadrature mode\n");
+ return -EINVAL;
+ }
+ priv->qdec_mode = 1;
+ bmr |= ATMEL_TC_QDEN | ATMEL_TC_POSEN;
+ cmr |= ATMEL_TC_ETRGEDG_RISING | ATMEL_TC_ABETRG | ATMEL_TC_XC0;
+ break;
+ }
+
+ regmap_write(priv->regmap, ATMEL_TC_BMR, bmr);
+ regmap_write(priv->regmap, ATMEL_TC_REG(priv->channel[0], CMR), cmr);
+
+ /* Enable clock and trigger counter */
+ regmap_write(priv->regmap, ATMEL_TC_REG(priv->channel[0], CCR),
+ ATMEL_TC_CLKEN | ATMEL_TC_SWTRG);
+
+ if (priv->qdec_mode) {
+ regmap_write(priv->regmap,
+ ATMEL_TC_REG(priv->channel[1], CMR), cmr);
+ regmap_write(priv->regmap,
+ ATMEL_TC_REG(priv->channel[1], CCR),
+ ATMEL_TC_CLKEN | ATMEL_TC_SWTRG);
+ }
+
+ return 0;
+}
+
+static int mchp_tc_count_signal_read(struct counter_device *counter,
+ struct counter_signal *signal,
+ enum counter_signal_value *val)
+{
+ struct mchp_tc_data *const priv = counter->priv;
+ bool sigstatus;
+ u32 sr;
+
+ regmap_read(priv->regmap, ATMEL_TC_REG(priv->channel[0], SR), &sr);
+
+ if (priv->trig_inverted)
+ sigstatus = (sr & ATMEL_TC_MTIOB);
+ else
+ sigstatus = (sr & ATMEL_TC_MTIOA);
+
+ *val = sigstatus ? COUNTER_SIGNAL_HIGH : COUNTER_SIGNAL_LOW;
+
+ return 0;
+}
+
+static int mchp_tc_count_action_get(struct counter_device *counter,
+ struct counter_count *count,
+ struct counter_synapse *synapse,
+ size_t *action)
+{
+ struct mchp_tc_data *const priv = counter->priv;
+ u32 cmr;
+
+ regmap_read(priv->regmap, ATMEL_TC_REG(priv->channel[0], CMR), &cmr);
+
+ *action = MCHP_TC_SYNAPSE_ACTION_NONE;
+
+ if (cmr & ATMEL_TC_ETRGEDG_NONE)
+ *action = MCHP_TC_SYNAPSE_ACTION_NONE;
+ else if (cmr & ATMEL_TC_ETRGEDG_RISING)
+ *action = MCHP_TC_SYNAPSE_ACTION_RISING_EDGE;
+ else if (cmr & ATMEL_TC_ETRGEDG_FALLING)
+ *action = MCHP_TC_SYNAPSE_ACTION_FALLING_EDGE;
+ else if (cmr & ATMEL_TC_ETRGEDG_BOTH)
+ *action = MCHP_TC_SYNAPSE_ACTION_BOTH_EDGE;
+
+ return 0;
+}
+
+static int mchp_tc_count_action_set(struct counter_device *counter,
+ struct counter_count *count,
+ struct counter_synapse *synapse,
+ size_t action)
+{
+ struct mchp_tc_data *const priv = counter->priv;
+ u32 edge = ATMEL_TC_ETRGEDG_NONE;
+
+ /* QDEC mode is rising edge only */
+ if (priv->qdec_mode)
+ return -EINVAL;
+
+ switch (action) {
+ case MCHP_TC_SYNAPSE_ACTION_NONE:
+ edge = ATMEL_TC_ETRGEDG_NONE;
+ break;
+ case MCHP_TC_SYNAPSE_ACTION_RISING_EDGE:
+ edge = ATMEL_TC_ETRGEDG_RISING;
+ break;
+ case MCHP_TC_SYNAPSE_ACTION_FALLING_EDGE:
+ edge = ATMEL_TC_ETRGEDG_FALLING;
+ break;
+ case MCHP_TC_SYNAPSE_ACTION_BOTH_EDGE:
+ edge = ATMEL_TC_ETRGEDG_BOTH;
+ break;
+ }
+
+ return regmap_write_bits(priv->regmap,
+ ATMEL_TC_REG(priv->channel[0], CMR),
+ ATMEL_TC_ETRGEDG, edge);
+}
+
+static int mchp_tc_count_read(struct counter_device *counter,
+ struct counter_count *count,
+ unsigned long *val)
+{
+ struct mchp_tc_data *const priv = counter->priv;
+ u32 cnt;
+
+ regmap_read(priv->regmap, ATMEL_TC_REG(priv->channel[0], CV), &cnt);
+ *val = cnt;
+
+ return 0;
+}
+
+static struct counter_count mchp_tc_counts[] = {
+ {
+ .id = 0,
+ .name = "Timer Counter",
+ .functions_list = mchp_tc_count_functions,
+ .num_functions = ARRAY_SIZE(mchp_tc_count_functions),
+ .synapses = mchp_tc_count_synapses,
+ .num_synapses = ARRAY_SIZE(mchp_tc_count_synapses),
+ },
+};
+
+static struct counter_ops mchp_tc_ops = {
+ .signal_read = mchp_tc_count_signal_read,
+ .count_read = mchp_tc_count_read,
+ .function_get = mchp_tc_count_function_get,
+ .function_set = mchp_tc_count_function_set,
+ .action_get = mchp_tc_count_action_get,
+ .action_set = mchp_tc_count_action_set
+};
+
+static const struct atmel_tcb_config tcb_rm9200_config = {
+ .counter_width = 16,
+};
+
+static const struct atmel_tcb_config tcb_sam9x5_config = {
+ .counter_width = 32,
+};
+
+static const struct atmel_tcb_config tcb_sama5d2_config = {
+ .counter_width = 32,
+ .has_gclk = true,
+ .has_qdec = true,
+};
+
+static const struct atmel_tcb_config tcb_sama5d3_config = {
+ .counter_width = 32,
+ .has_qdec = true,
+};
+
+static const struct of_device_id atmel_tc_of_match[] = {
+ { .compatible = "atmel,at91rm9200-tcb", .data = &tcb_rm9200_config, },
+ { .compatible = "atmel,at91sam9x5-tcb", .data = &tcb_sam9x5_config, },
+ { .compatible = "atmel,sama5d2-tcb", .data = &tcb_sama5d2_config, },
+ { .compatible = "atmel,sama5d3-tcb", .data = &tcb_sama5d3_config, },
+ { /* sentinel */ }
+};
+
+static void mchp_tc_clk_remove(void *ptr)
+{
+ clk_disable_unprepare((struct clk *)ptr);
+}
+
+static int mchp_tc_probe(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ const struct atmel_tcb_config *tcb_config;
+ const struct of_device_id *match;
+ struct mchp_tc_data *priv;
+ char clk_name[7];
+ struct regmap *regmap;
+ struct clk *clk[3];
+ int channel;
+ int ret, i;
+
+ priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, priv);
+
+ match = of_match_node(atmel_tc_of_match, np->parent);
+ tcb_config = match->data;
+ if (!tcb_config) {
+ dev_err(&pdev->dev, "No matching parent node found\n");
+ return -ENODEV;
+ }
+
+ regmap = syscon_node_to_regmap(np->parent);
+ if (IS_ERR(priv->regmap))
+ return PTR_ERR(priv->regmap);
+
+ /* max. channels number is 2 when in QDEC mode */
+ priv->num_channels = of_property_count_u32_elems(np, "reg");
+ if (priv->num_channels < 0) {
+ dev_err(&pdev->dev, "Invalid or missing channel\n");
+ return -EINVAL;
+ }
+
+ /* Register channels and initialize clocks */
+ for (i = 0; i < priv->num_channels; i++) {
+ ret = of_property_read_u32_index(np, "reg", i, &channel);
+ if (ret < 0 || channel > 2)
+ return -ENODEV;
+
+ priv->channel[i] = channel;
+
+ snprintf(clk_name, sizeof(clk_name), "t%d_clk", channel);
+
+ clk[i] = of_clk_get_by_name(np->parent, clk_name);
+ if (IS_ERR(clk[i])) {
+ /* Fallback to t0_clk */
+ clk[i] = of_clk_get_by_name(np->parent, "t0_clk");
+ if (IS_ERR(clk[i]))
+ return PTR_ERR(clk[i]);
+ }
+
+ ret = clk_prepare_enable(clk[i]);
+ if (ret)
+ return ret;
+
+ ret = devm_add_action_or_reset(&pdev->dev,
+ mchp_tc_clk_remove,
+ clk[i]);
+ if (ret)
+ return ret;
+
+ dev_dbg(&pdev->dev,
+ "Initialized capture mode on channel %d\n",
+ channel);
+ }
+
+ priv->tc_cfg = tcb_config;
+ priv->regmap = regmap;
+ priv->counter.name = dev_name(&pdev->dev);
+ priv->counter.parent = &pdev->dev;
+ priv->counter.ops = &mchp_tc_ops;
+ priv->counter.num_counts = ARRAY_SIZE(mchp_tc_counts);
+ priv->counter.counts = mchp_tc_counts;
+ priv->counter.num_signals = ARRAY_SIZE(mchp_tc_count_signals);
+ priv->counter.signals = mchp_tc_count_signals;
+ priv->counter.priv = priv;
+
+ return devm_counter_register(&pdev->dev, &priv->counter);
+}
+
+static const struct of_device_id mchp_tc_dt_ids[] = {
+ { .compatible = "microchip,tcb-capture", },
+ { /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, mchp_tc_dt_ids);
+
+static struct platform_driver mchp_tc_driver = {
+ .probe = mchp_tc_probe,
+ .driver = {
+ .name = "microchip-tcb-capture",
+ .of_match_table = mchp_tc_dt_ids,
+ },
+};
+module_platform_driver(mchp_tc_driver);
+
+MODULE_AUTHOR("Kamel Bouhara <kamel.bouhara@bootlin.com>");
+MODULE_DESCRIPTION("Microchip TCB Capture driver");
+MODULE_LICENSE("GPL v2");
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-14 06:55:50 +0000