1 // SPDX-License-Identifier: GPL-2.0-only
5  * Counter driver for Texas Instruments Enhanced Quadrature Encoder Pulse (eQEP)
18 /* 32-bit registers */
29 /* 16-bit registers */
70 /* EQEP Inputs */
101 	regmap_read(priv->regmap32, QPOSCNT, &cnt);  in ti_eqep_count_read()
113 	regmap_read(priv->regmap32, QPOSMAX, &max);  in ti_eqep_count_write()
115 		return -EINVAL;  in ti_eqep_count_write()
117 	return regmap_write(priv->regmap32, QPOSCNT, val);  in ti_eqep_count_write()
127 	regmap_read(priv->regmap16, QDECCTL, &qdecctl);  in ti_eqep_function_read()
169 		return -EINVAL;  in ti_eqep_function_write()
172 	return regmap_write_bits(priv->regmap16, QDECCTL, QDECCTL_QSRC,  in ti_eqep_function_write()
198 		/* In direction-count mode only rising edge of QEPA is counted  in ti_eqep_action_read()
201 		switch (synapse->signal->id) {  in ti_eqep_action_read()
210 			return -EINVAL;  in ti_eqep_action_read()
214 		/* In up/down-count modes only QEPA is counted and QEPB is not  in ti_eqep_action_read()
217 		switch (synapse->signal->id) {  in ti_eqep_action_read()
219 			err = regmap_read(priv->regmap16, QDECCTL, &qdecctl);  in ti_eqep_action_read()
233 			return -EINVAL;  in ti_eqep_action_read()
237 		return -EINVAL;  in ti_eqep_action_read()
256 	regmap_read(priv->regmap32, QPOSMAX, &qposmax);  in ti_eqep_position_ceiling_read()
270 		return -ERANGE;  in ti_eqep_position_ceiling_write()
272 	regmap_write(priv->regmap32, QPOSMAX, ceiling);  in ti_eqep_position_ceiling_write()
283 	regmap_read(priv->regmap16, QEPCTL, &qepctl);  in ti_eqep_position_enable_read()
295 	regmap_write_bits(priv->regmap16, QEPCTL, QEPCTL_PHEN, enable ? -1 : 0);  in ti_eqep_position_enable_write()
358 	.name = "32-bit",
366 	.name = "16-bit",
375 	struct device *dev = &pdev->dev;  in ti_eqep_probe()
383 		return -ENOMEM;  in ti_eqep_probe()
390 	priv->regmap32 = devm_regmap_init_mmio(dev, base,  in ti_eqep_probe()
392 	if (IS_ERR(priv->regmap32))  in ti_eqep_probe()
393 		return PTR_ERR(priv->regmap32);  in ti_eqep_probe()
395 	priv->regmap16 = devm_regmap_init_mmio(dev, base + 0x24,  in ti_eqep_probe()
397 	if (IS_ERR(priv->regmap16))  in ti_eqep_probe()
398 		return PTR_ERR(priv->regmap16);  in ti_eqep_probe()
400 	counter->name = dev_name(dev);  in ti_eqep_probe()
401 	counter->parent = dev;  in ti_eqep_probe()
402 	counter->ops = &ti_eqep_counter_ops;  in ti_eqep_probe()
403 	counter->counts = ti_eqep_counts;  in ti_eqep_probe()
404 	counter->num_counts = ARRAY_SIZE(ti_eqep_counts);  in ti_eqep_probe()
405 	counter->signals = ti_eqep_signals;  in ti_eqep_probe()
406 	counter->num_signals = ARRAY_SIZE(ti_eqep_signals);  in ti_eqep_probe()
431 	struct device *dev = &pdev->dev;  in ti_eqep_remove()
441 	{ .compatible = "ti,am3352-eqep", },
450 		.name = "ti-eqep-cnt",
457 MODULE_DESCRIPTION("TI eQEP counter driver");