1 // SPDX-License-Identifier: GPL-2.0-only
5  * Counter driver for Texas Instruments Enhanced Quadrature Encoder Pulse (eQEP)
20 /* 32-bit registers */
31 /* 16-bit registers */
119 /* EQEP Inputs */
144 	regmap_read(priv->regmap32, QPOSCNT, &cnt);  in ti_eqep_count_read()
156 	regmap_read(priv->regmap32, QPOSMAX, &max);  in ti_eqep_count_write()
158 		return -EINVAL;  in ti_eqep_count_write()
160 	return regmap_write(priv->regmap32, QPOSCNT, val);  in ti_eqep_count_write()
170 	regmap_read(priv->regmap16, QDECCTL, &qdecctl);  in ti_eqep_function_read()
212 		return -EINVAL;  in ti_eqep_function_write()
215 	return regmap_write_bits(priv->regmap16, QDECCTL, QDECCTL_QSRC,  in ti_eqep_function_write()
241 		/* In direction-count mode only rising edge of QEPA is counted  in ti_eqep_action_read()
244 		switch (synapse->signal->id) {  in ti_eqep_action_read()
253 			return -EINVAL;  in ti_eqep_action_read()
257 		/* In up/down-count modes only QEPA is counted and QEPB is not  in ti_eqep_action_read()
260 		switch (synapse->signal->id) {  in ti_eqep_action_read()
262 			err = regmap_read(priv->regmap16, QDECCTL, &qdecctl);  in ti_eqep_action_read()
276 			return -EINVAL;  in ti_eqep_action_read()
280 		return -EINVAL;  in ti_eqep_action_read()
290 	list_for_each_entry(event_node, &counter->events_list, l) {  in ti_eqep_events_configure()
291 		switch (event_node->event) {  in ti_eqep_events_configure()
304 	return regmap_write(priv->regmap16, QEINT, qeint);  in ti_eqep_events_configure()
310 	switch (watch->event) {  in ti_eqep_watch_validate()
314 		if (watch->channel != 0)  in ti_eqep_watch_validate()
315 			return -EINVAL;  in ti_eqep_watch_validate()
319 		return -EINVAL;  in ti_eqep_watch_validate()
340 	regmap_read(priv->regmap32, QPOSMAX, &qposmax);  in ti_eqep_position_ceiling_read()
354 		return -ERANGE;  in ti_eqep_position_ceiling_write()
356 	regmap_write(priv->regmap32, QPOSMAX, ceiling);  in ti_eqep_position_ceiling_write()
367 	regmap_read(priv->regmap16, QEPCTL, &qepctl);  in ti_eqep_position_enable_read()
379 	regmap_write_bits(priv->regmap16, QEPCTL, QEPCTL_PHEN, enable ? -1 : 0);  in ti_eqep_position_enable_write()
391 	regmap_read(priv->regmap16, QEPSTS, &qepsts);  in ti_eqep_direction_read()
463 	regmap_read(priv->regmap16, QFLG, &qflg);  in ti_eqep_irq_handler()
474 	regmap_write(priv->regmap16, QCLR, qflg);  in ti_eqep_irq_handler()
480 	.name = "32-bit",
488 	.name = "16-bit",
497 	struct device *dev = &pdev->dev;  in ti_eqep_probe()
506 		return -ENOMEM;  in ti_eqep_probe()
513 	priv->regmap32 = devm_regmap_init_mmio(dev, base,  in ti_eqep_probe()
515 	if (IS_ERR(priv->regmap32))  in ti_eqep_probe()
516 		return PTR_ERR(priv->regmap32);  in ti_eqep_probe()
518 	priv->regmap16 = devm_regmap_init_mmio(dev, base + 0x24,  in ti_eqep_probe()
520 	if (IS_ERR(priv->regmap16))  in ti_eqep_probe()
521 		return PTR_ERR(priv->regmap16);  in ti_eqep_probe()
532 	counter->name = dev_name(dev);  in ti_eqep_probe()
533 	counter->parent = dev;  in ti_eqep_probe()
534 	counter->ops = &ti_eqep_counter_ops;  in ti_eqep_probe()
535 	counter->counts = ti_eqep_counts;  in ti_eqep_probe()
536 	counter->num_counts = ARRAY_SIZE(ti_eqep_counts);  in ti_eqep_probe()
537 	counter->signals = ti_eqep_signals;  in ti_eqep_probe()
538 	counter->num_signals = ARRAY_SIZE(ti_eqep_signals);  in ti_eqep_probe()
567 	struct device *dev = &pdev->dev;  in ti_eqep_remove()
575 	{ .compatible = "ti,am3352-eqep", },
576 	{ .compatible = "ti,am62-eqep", },
585 		.name = "ti-eqep-cnt",
592 MODULE_DESCRIPTION("TI eQEP counter driver");