counter: Add microchip TCB capture counter
This drivers allows to use the capture mode of the Timer Counter Block hardware block available in Microchip SoCs through the counter subsystem. Two functions of the counter are supported for the moment: period capture and quadrature decoder. The latter is only supported by the SAMA5 series of SoCs. For the period capture mode a basic setup has been chosen that will reset the counter each time the period is actually reached. Of course the device offers much more possibilities. For quadrature mode, both channel 0 and 1 must be configured even if we only capture the position (no revolution/rotation). Signed-off-by: Kamel Bouhara <kamel.bouhara@bootlin.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Kamel Bouhara
Jonathan Cameron
Родитель
7eb181cf06
Коммит
106b104137
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@ -70,4 +70,15 @@ config FTM_QUADDEC
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To compile this driver as a module, choose M here: the
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module will be called ftm-quaddec.
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config MICROCHIP_TCB_CAPTURE
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tristate "Microchip Timer Counter Capture driver"
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depends on HAS_IOMEM && OF
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select REGMAP_MMIO
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help
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Select this option to enable the Microchip Timer Counter Block
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capture driver.
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To compile this driver as a module, choose M here: the
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module will be called microchip-tcb-capture.
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endif # COUNTER
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@ -10,3 +10,4 @@ obj-$(CONFIG_STM32_TIMER_CNT) += stm32-timer-cnt.o
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obj-$(CONFIG_STM32_LPTIMER_CNT) += stm32-lptimer-cnt.o
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obj-$(CONFIG_TI_EQEP) += ti-eqep.o
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obj-$(CONFIG_FTM_QUADDEC) += ftm-quaddec.o
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obj-$(CONFIG_MICROCHIP_TCB_CAPTURE) += microchip-tcb-capture.o
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@ -0,0 +1,397 @@
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// SPDX-License-Identifier: GPL-2.0-only
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/**
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* Copyright (C) 2020 Microchip
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*
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* Author: Kamel Bouhara <kamel.bouhara@bootlin.com>
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*/
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#include <linux/clk.h>
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#include <linux/counter.h>
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#include <linux/mfd/syscon.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <soc/at91/atmel_tcb.h>
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#define ATMEL_TC_CMR_MASK (ATMEL_TC_LDRA_RISING | ATMEL_TC_LDRB_FALLING | \
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ATMEL_TC_ETRGEDG_RISING | ATMEL_TC_LDBDIS | \
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ATMEL_TC_LDBSTOP)
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#define ATMEL_TC_QDEN BIT(8)
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#define ATMEL_TC_POSEN BIT(9)
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struct mchp_tc_data {
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const struct atmel_tcb_config *tc_cfg;
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struct counter_device counter;
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struct regmap *regmap;
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int qdec_mode;
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int num_channels;
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int channel[2];
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bool trig_inverted;
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};
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enum mchp_tc_count_function {
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MCHP_TC_FUNCTION_INCREASE,
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MCHP_TC_FUNCTION_QUADRATURE,
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};
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static enum counter_count_function mchp_tc_count_functions[] = {
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[MCHP_TC_FUNCTION_INCREASE] = COUNTER_COUNT_FUNCTION_INCREASE,
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[MCHP_TC_FUNCTION_QUADRATURE] = COUNTER_COUNT_FUNCTION_QUADRATURE_X4,
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};
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enum mchp_tc_synapse_action {
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MCHP_TC_SYNAPSE_ACTION_NONE = 0,
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MCHP_TC_SYNAPSE_ACTION_RISING_EDGE,
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MCHP_TC_SYNAPSE_ACTION_FALLING_EDGE,
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MCHP_TC_SYNAPSE_ACTION_BOTH_EDGE
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};
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static enum counter_synapse_action mchp_tc_synapse_actions[] = {
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[MCHP_TC_SYNAPSE_ACTION_NONE] = COUNTER_SYNAPSE_ACTION_NONE,
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[MCHP_TC_SYNAPSE_ACTION_RISING_EDGE] = COUNTER_SYNAPSE_ACTION_RISING_EDGE,
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[MCHP_TC_SYNAPSE_ACTION_FALLING_EDGE] = COUNTER_SYNAPSE_ACTION_FALLING_EDGE,
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[MCHP_TC_SYNAPSE_ACTION_BOTH_EDGE] = COUNTER_SYNAPSE_ACTION_BOTH_EDGES,
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};
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static struct counter_signal mchp_tc_count_signals[] = {
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{
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.id = 0,
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.name = "Channel A",
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},
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{
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.id = 1,
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.name = "Channel B",
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}
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};
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static struct counter_synapse mchp_tc_count_synapses[] = {
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{
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.actions_list = mchp_tc_synapse_actions,
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.num_actions = ARRAY_SIZE(mchp_tc_synapse_actions),
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.signal = &mchp_tc_count_signals[0]
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},
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{
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.actions_list = mchp_tc_synapse_actions,
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.num_actions = ARRAY_SIZE(mchp_tc_synapse_actions),
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.signal = &mchp_tc_count_signals[1]
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}
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};
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static int mchp_tc_count_function_get(struct counter_device *counter,
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struct counter_count *count,
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size_t *function)
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{
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struct mchp_tc_data *const priv = counter->priv;
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if (priv->qdec_mode)
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*function = MCHP_TC_FUNCTION_QUADRATURE;
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else
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*function = MCHP_TC_FUNCTION_INCREASE;
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return 0;
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}
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static int mchp_tc_count_function_set(struct counter_device *counter,
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struct counter_count *count,
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size_t function)
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{
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struct mchp_tc_data *const priv = counter->priv;
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u32 bmr, cmr;
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regmap_read(priv->regmap, ATMEL_TC_BMR, &bmr);
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regmap_read(priv->regmap, ATMEL_TC_REG(priv->channel[0], CMR), &cmr);
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/* Set capture mode */
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cmr &= ~ATMEL_TC_WAVE;
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switch (function) {
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case MCHP_TC_FUNCTION_INCREASE:
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priv->qdec_mode = 0;
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/* Set highest rate based on whether soc has gclk or not */
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bmr &= ~(ATMEL_TC_QDEN | ATMEL_TC_POSEN);
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if (priv->tc_cfg->has_gclk)
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cmr |= ATMEL_TC_TIMER_CLOCK2;
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else
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cmr |= ATMEL_TC_TIMER_CLOCK1;
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/* Setup the period capture mode */
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cmr |= ATMEL_TC_CMR_MASK;
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cmr &= ~(ATMEL_TC_ABETRG | ATMEL_TC_XC0);
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break;
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case MCHP_TC_FUNCTION_QUADRATURE:
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if (!priv->tc_cfg->has_qdec)
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return -EINVAL;
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/* In QDEC mode settings both channels 0 and 1 are required */
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if (priv->num_channels < 2 || priv->channel[0] != 0 ||
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priv->channel[1] != 1) {
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pr_err("Invalid channels number or id for quadrature mode\n");
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return -EINVAL;
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}
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priv->qdec_mode = 1;
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bmr |= ATMEL_TC_QDEN | ATMEL_TC_POSEN;
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cmr |= ATMEL_TC_ETRGEDG_RISING | ATMEL_TC_ABETRG | ATMEL_TC_XC0;
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break;
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}
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regmap_write(priv->regmap, ATMEL_TC_BMR, bmr);
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regmap_write(priv->regmap, ATMEL_TC_REG(priv->channel[0], CMR), cmr);
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/* Enable clock and trigger counter */
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regmap_write(priv->regmap, ATMEL_TC_REG(priv->channel[0], CCR),
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ATMEL_TC_CLKEN | ATMEL_TC_SWTRG);
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if (priv->qdec_mode) {
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regmap_write(priv->regmap,
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ATMEL_TC_REG(priv->channel[1], CMR), cmr);
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regmap_write(priv->regmap,
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ATMEL_TC_REG(priv->channel[1], CCR),
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ATMEL_TC_CLKEN | ATMEL_TC_SWTRG);
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}
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return 0;
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}
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static int mchp_tc_count_signal_read(struct counter_device *counter,
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struct counter_signal *signal,
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enum counter_signal_value *val)
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{
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struct mchp_tc_data *const priv = counter->priv;
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bool sigstatus;
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u32 sr;
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regmap_read(priv->regmap, ATMEL_TC_REG(priv->channel[0], SR), &sr);
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if (priv->trig_inverted)
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sigstatus = (sr & ATMEL_TC_MTIOB);
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else
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sigstatus = (sr & ATMEL_TC_MTIOA);
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*val = sigstatus ? COUNTER_SIGNAL_HIGH : COUNTER_SIGNAL_LOW;
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return 0;
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}
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static int mchp_tc_count_action_get(struct counter_device *counter,
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struct counter_count *count,
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struct counter_synapse *synapse,
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size_t *action)
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{
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struct mchp_tc_data *const priv = counter->priv;
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u32 cmr;
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regmap_read(priv->regmap, ATMEL_TC_REG(priv->channel[0], CMR), &cmr);
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*action = MCHP_TC_SYNAPSE_ACTION_NONE;
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if (cmr & ATMEL_TC_ETRGEDG_NONE)
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*action = MCHP_TC_SYNAPSE_ACTION_NONE;
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else if (cmr & ATMEL_TC_ETRGEDG_RISING)
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*action = MCHP_TC_SYNAPSE_ACTION_RISING_EDGE;
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else if (cmr & ATMEL_TC_ETRGEDG_FALLING)
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*action = MCHP_TC_SYNAPSE_ACTION_FALLING_EDGE;
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else if (cmr & ATMEL_TC_ETRGEDG_BOTH)
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*action = MCHP_TC_SYNAPSE_ACTION_BOTH_EDGE;
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return 0;
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}
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static int mchp_tc_count_action_set(struct counter_device *counter,
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struct counter_count *count,
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struct counter_synapse *synapse,
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size_t action)
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{
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struct mchp_tc_data *const priv = counter->priv;
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u32 edge = ATMEL_TC_ETRGEDG_NONE;
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/* QDEC mode is rising edge only */
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if (priv->qdec_mode)
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return -EINVAL;
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switch (action) {
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case MCHP_TC_SYNAPSE_ACTION_NONE:
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edge = ATMEL_TC_ETRGEDG_NONE;
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break;
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case MCHP_TC_SYNAPSE_ACTION_RISING_EDGE:
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edge = ATMEL_TC_ETRGEDG_RISING;
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break;
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case MCHP_TC_SYNAPSE_ACTION_FALLING_EDGE:
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edge = ATMEL_TC_ETRGEDG_FALLING;
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break;
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case MCHP_TC_SYNAPSE_ACTION_BOTH_EDGE:
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edge = ATMEL_TC_ETRGEDG_BOTH;
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break;
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}
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return regmap_write_bits(priv->regmap,
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ATMEL_TC_REG(priv->channel[0], CMR),
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ATMEL_TC_ETRGEDG, edge);
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}
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static int mchp_tc_count_read(struct counter_device *counter,
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struct counter_count *count,
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unsigned long *val)
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{
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struct mchp_tc_data *const priv = counter->priv;
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u32 cnt;
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regmap_read(priv->regmap, ATMEL_TC_REG(priv->channel[0], CV), &cnt);
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*val = cnt;
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return 0;
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}
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static struct counter_count mchp_tc_counts[] = {
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{
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.id = 0,
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.name = "Timer Counter",
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.functions_list = mchp_tc_count_functions,
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.num_functions = ARRAY_SIZE(mchp_tc_count_functions),
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.synapses = mchp_tc_count_synapses,
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.num_synapses = ARRAY_SIZE(mchp_tc_count_synapses),
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},
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};
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static struct counter_ops mchp_tc_ops = {
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.signal_read = mchp_tc_count_signal_read,
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.count_read = mchp_tc_count_read,
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.function_get = mchp_tc_count_function_get,
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.function_set = mchp_tc_count_function_set,
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.action_get = mchp_tc_count_action_get,
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.action_set = mchp_tc_count_action_set
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};
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static const struct atmel_tcb_config tcb_rm9200_config = {
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.counter_width = 16,
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};
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static const struct atmel_tcb_config tcb_sam9x5_config = {
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.counter_width = 32,
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};
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static const struct atmel_tcb_config tcb_sama5d2_config = {
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.counter_width = 32,
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.has_gclk = true,
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.has_qdec = true,
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};
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static const struct atmel_tcb_config tcb_sama5d3_config = {
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.counter_width = 32,
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.has_qdec = true,
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};
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static const struct of_device_id atmel_tc_of_match[] = {
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{ .compatible = "atmel,at91rm9200-tcb", .data = &tcb_rm9200_config, },
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{ .compatible = "atmel,at91sam9x5-tcb", .data = &tcb_sam9x5_config, },
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{ .compatible = "atmel,sama5d2-tcb", .data = &tcb_sama5d2_config, },
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{ .compatible = "atmel,sama5d3-tcb", .data = &tcb_sama5d3_config, },
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{ /* sentinel */ }
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};
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static void mchp_tc_clk_remove(void *ptr)
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{
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clk_disable_unprepare((struct clk *)ptr);
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}
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static int mchp_tc_probe(struct platform_device *pdev)
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{
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struct device_node *np = pdev->dev.of_node;
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const struct atmel_tcb_config *tcb_config;
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const struct of_device_id *match;
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struct mchp_tc_data *priv;
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char clk_name[7];
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struct regmap *regmap;
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struct clk *clk[3];
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int channel;
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int ret, i;
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priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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platform_set_drvdata(pdev, priv);
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match = of_match_node(atmel_tc_of_match, np->parent);
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tcb_config = match->data;
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if (!tcb_config) {
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dev_err(&pdev->dev, "No matching parent node found\n");
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return -ENODEV;
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}
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regmap = syscon_node_to_regmap(np->parent);
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if (IS_ERR(priv->regmap))
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return PTR_ERR(priv->regmap);
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/* max. channels number is 2 when in QDEC mode */
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priv->num_channels = of_property_count_u32_elems(np, "reg");
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if (priv->num_channels < 0) {
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dev_err(&pdev->dev, "Invalid or missing channel\n");
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return -EINVAL;
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}
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/* Register channels and initialize clocks */
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for (i = 0; i < priv->num_channels; i++) {
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ret = of_property_read_u32_index(np, "reg", i, &channel);
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if (ret < 0 || channel > 2)
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return -ENODEV;
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priv->channel[i] = channel;
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snprintf(clk_name, sizeof(clk_name), "t%d_clk", channel);
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clk[i] = of_clk_get_by_name(np->parent, clk_name);
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if (IS_ERR(clk[i])) {
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/* Fallback to t0_clk */
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clk[i] = of_clk_get_by_name(np->parent, "t0_clk");
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if (IS_ERR(clk[i]))
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return PTR_ERR(clk[i]);
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}
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ret = clk_prepare_enable(clk[i]);
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if (ret)
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return ret;
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ret = devm_add_action_or_reset(&pdev->dev,
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mchp_tc_clk_remove,
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clk[i]);
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if (ret)
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return ret;
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dev_dbg(&pdev->dev,
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"Initialized capture mode on channel %d\n",
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channel);
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}
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priv->tc_cfg = tcb_config;
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priv->regmap = regmap;
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priv->counter.name = dev_name(&pdev->dev);
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priv->counter.parent = &pdev->dev;
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priv->counter.ops = &mchp_tc_ops;
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priv->counter.num_counts = ARRAY_SIZE(mchp_tc_counts);
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priv->counter.counts = mchp_tc_counts;
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priv->counter.num_signals = ARRAY_SIZE(mchp_tc_count_signals);
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priv->counter.signals = mchp_tc_count_signals;
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priv->counter.priv = priv;
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return devm_counter_register(&pdev->dev, &priv->counter);
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}
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static const struct of_device_id mchp_tc_dt_ids[] = {
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{ .compatible = "microchip,tcb-capture", },
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{ /* sentinel */ },
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};
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MODULE_DEVICE_TABLE(of, mchp_tc_dt_ids);
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static struct platform_driver mchp_tc_driver = {
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.probe = mchp_tc_probe,
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.driver = {
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.name = "microchip-tcb-capture",
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.of_match_table = mchp_tc_dt_ids,
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},
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};
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module_platform_driver(mchp_tc_driver);
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MODULE_AUTHOR("Kamel Bouhara <kamel.bouhara@bootlin.com>");
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MODULE_DESCRIPTION("Microchip TCB Capture driver");
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MODULE_LICENSE("GPL v2");
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