1 // SPDX-License-Identifier: GPL-2.0-only
5  * Counter driver for Texas Instruments Enhanced Quadrature Encoder Pulse (eQEP)
17 /* 32-bit registers */
28 /* 16-bit registers */
69 /* EQEP Inputs */
98 	struct ti_eqep_cnt *priv = counter->priv;  in ti_eqep_count_read()
101 	regmap_read(priv->regmap32, QPOSCNT, &cnt);  in ti_eqep_count_read()
110 	struct ti_eqep_cnt *priv = counter->priv;  in ti_eqep_count_write()
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()
123 	struct ti_eqep_cnt *priv = counter->priv;  in ti_eqep_function_get()
126 	regmap_read(priv->regmap16, QDECCTL, &qdecctl);  in ti_eqep_function_get()
135 	struct ti_eqep_cnt *priv = counter->priv;  in ti_eqep_function_set()
137 	return regmap_write_bits(priv->regmap16, QDECCTL, QDECCTL_QSRC,  in ti_eqep_function_set()
145 	struct ti_eqep_cnt *priv = counter->priv;  in ti_eqep_action_get()
162 		/* In direction-count mode only rising edge of QEPA is counted  in ti_eqep_action_get()
165 		switch (synapse->signal->id) {  in ti_eqep_action_get()
174 			return -EINVAL;  in ti_eqep_action_get()
178 		/* In up/down-count modes only QEPA is counted and QEPB is not  in ti_eqep_action_get()
181 		switch (synapse->signal->id) {  in ti_eqep_action_get()
183 			err = regmap_read(priv->regmap16, QDECCTL, &qdecctl);  in ti_eqep_action_get()
197 			return -EINVAL;  in ti_eqep_action_get()
201 		return -EINVAL;  in ti_eqep_action_get()
217 	struct ti_eqep_cnt *priv = counter->priv;  in ti_eqep_position_ceiling_read()
220 	regmap_read(priv->regmap32, QPOSMAX, &qposmax);  in ti_eqep_position_ceiling_read()
230 	struct ti_eqep_cnt *priv = counter->priv;  in ti_eqep_position_ceiling_write()
238 	regmap_write(priv->regmap32, QPOSMAX, res);  in ti_eqep_position_ceiling_write()
247 	struct ti_eqep_cnt *priv = counter->priv;  in ti_eqep_position_enable_read()
250 	regmap_read(priv->regmap16, QEPCTL, &qepctl);  in ti_eqep_position_enable_read()
260 	struct ti_eqep_cnt *priv = counter->priv;  in ti_eqep_position_enable_write()
268 	regmap_write_bits(priv->regmap16, QEPCTL, QEPCTL_PHEN, res ? -1 : 0);  in ti_eqep_position_enable_write()
337 	.name = "32-bit",
345 	.name = "16-bit",
354 	struct device *dev = &pdev->dev;  in ti_eqep_probe()
361 		return -ENOMEM;  in ti_eqep_probe()
367 	priv->regmap32 = devm_regmap_init_mmio(dev, base,  in ti_eqep_probe()
369 	if (IS_ERR(priv->regmap32))  in ti_eqep_probe()
370 		return PTR_ERR(priv->regmap32);  in ti_eqep_probe()
372 	priv->regmap16 = devm_regmap_init_mmio(dev, base + 0x24,  in ti_eqep_probe()
374 	if (IS_ERR(priv->regmap16))  in ti_eqep_probe()
375 		return PTR_ERR(priv->regmap16);  in ti_eqep_probe()
377 	priv->counter.name = dev_name(dev);  in ti_eqep_probe()
378 	priv->counter.parent = dev;  in ti_eqep_probe()
379 	priv->counter.ops = &ti_eqep_counter_ops;  in ti_eqep_probe()
380 	priv->counter.counts = ti_eqep_counts;  in ti_eqep_probe()
381 	priv->counter.num_counts = ARRAY_SIZE(ti_eqep_counts);  in ti_eqep_probe()
382 	priv->counter.signals = ti_eqep_signals;  in ti_eqep_probe()
383 	priv->counter.num_signals = ARRAY_SIZE(ti_eqep_signals);  in ti_eqep_probe()
384 	priv->counter.priv = priv;  in ti_eqep_probe()
396 	err = counter_register(&priv->counter);  in ti_eqep_probe()
409 	struct device *dev = &pdev->dev;  in ti_eqep_remove()
411 	counter_unregister(&priv->counter);  in ti_eqep_remove()
419 	{ .compatible = "ti,am3352-eqep", },
428 		.name = "ti-eqep-cnt",
435 MODULE_DESCRIPTION("TI eQEP counter driver");