1 // SPDX-License-Identifier: GPL-2.0-only
3  * Reset driver for the Mobileye EyeQ5, EyeQ6L and EyeQ6H platforms.
5  * Controllers live in a shared register region called OLB. EyeQ5 and EyeQ6L
6  * have a single OLB instance for a single reset controller. EyeQ6H has seven
7  * OLB instances; three host reset controllers.
13  * Domain types define expected behavior: one-register-per-reset,
14  * one-bit-per-reset, status detection method, busywait duration, etc.
16  * We use eqr_ as prefix, as-in "EyeQ Reset", but way shorter.
18  * Known resets in EyeQ5 domain 0 (type EQR_EYEQ5_SARCR):
27  * Known resets in EyeQ5 domain 1 (type EQR_EYEQ5_ACRP):
33  * Known resets in EyeQ5 domain 2 (type EQR_EYEQ5_PCIE):
54  *  4. UART1	 5. I2C0	 6. I2C1	 7. -hole-
65  *  - PMA: Programmable Macro Array
66  *  - MPC: Multi-threaded Processing Clusters
67  *  - VMP: Vector Microcode Processors
89 #include <linux/reset-controller.h>
156 	 * One mutex per domain for read-modify-write operations on registers.
182 	void __iomem *base = priv->base + priv->data->domains[domain].offset;  in eqr_busy_wait_locked()
183 	enum eqr_domain_type domain_type = priv->data->domains[domain].type;  in eqr_busy_wait_locked()
190 	lockdep_assert_held(&priv->mutexes[domain]);  in eqr_busy_wait_locked()
234 		ret = -EINVAL;  in eqr_busy_wait_locked()
238 	if (ret == -ETIMEDOUT)  in eqr_busy_wait_locked()
239 		dev_dbg(dev, "%u-%u: timeout\n", domain, offset);  in eqr_busy_wait_locked()
245 	enum eqr_domain_type domain_type = priv->data->domains[domain].type;  in eqr_assert_locked()
249 	lockdep_assert_held(&priv->mutexes[domain]);  in eqr_assert_locked()
251 	base = priv->base + priv->data->domains[domain].offset;  in eqr_assert_locked()
288 	dev_dbg(rcdev->dev, "%u-%u: assert request\n", domain, offset);  in eqr_assert()
290 	guard(mutex)(&priv->mutexes[domain]);  in eqr_assert()
293 	return eqr_busy_wait_locked(priv, rcdev->dev, domain, offset, true);  in eqr_assert()
299 	enum eqr_domain_type domain_type = priv->data->domains[domain].type;  in eqr_deassert_locked()
303 	lockdep_assert_held(&priv->mutexes[domain]);  in eqr_deassert_locked()
305 	base = priv->base + priv->data->domains[domain].offset;  in eqr_deassert_locked()
342 	dev_dbg(rcdev->dev, "%u-%u: deassert request\n", domain, offset);  in eqr_deassert()
344 	guard(mutex)(&priv->mutexes[domain]);  in eqr_deassert()
347 	return eqr_busy_wait_locked(priv, rcdev->dev, domain, offset, false);  in eqr_deassert()
355 	enum eqr_domain_type domain_type = priv->data->domains[domain].type;  in eqr_status()
358 	dev_dbg(rcdev->dev, "%u-%u: status request\n", domain, offset);  in eqr_status()
360 	guard(mutex)(&priv->mutexes[domain]);  in eqr_status()
362 	base = priv->base + priv->data->domains[domain].offset;  in eqr_status()
377 		return -EINVAL;  in eqr_status()
392 	if (domain >= priv->data->domain_count || offset > 31 ||  in eqr_of_xlate_internal()
393 	    !(priv->data->domains[domain].valid_mask & BIT(offset))) {  in eqr_of_xlate_internal()
394 		dev_err(rcdev->dev, "%u-%u: invalid reset\n", domain, offset);  in eqr_of_xlate_internal()
395 		return -EINVAL;  in eqr_of_xlate_internal()
404 	return eqr_of_xlate_internal(rcdev, 0, reset_spec->args[0]);  in eqr_of_xlate_onecell()
410 	return eqr_of_xlate_internal(rcdev, reset_spec->args[0], reset_spec->args[1]);  in eqr_of_xlate_twocells()
417 	struct device *dev = &adev->dev;  in eqr_probe()
423 	 * We are an auxiliary device of clk-eyeq. We do not have an OF node by  in eqr_probe()
426 	WARN_ON(dev->of_node);  in eqr_probe()
427 	device_set_of_node_from_dev(dev, dev->parent);  in eqr_probe()
428 	if (!dev->of_node)  in eqr_probe()
429 		return -ENODEV;  in eqr_probe()
435 	match = of_match_node(dev->driver->of_match_table, dev->of_node);  in eqr_probe()
436 	if (!match || !match->data)  in eqr_probe()
437 		return -ENODEV;  in eqr_probe()
441 		return -ENOMEM;  in eqr_probe()
443 	priv->data = match->data;  in eqr_probe()
444 	priv->base = (void __iomem *)dev_get_platdata(dev);  in eqr_probe()
445 	priv->rcdev.ops = &eqr_ops;  in eqr_probe()
446 	priv->rcdev.owner = THIS_MODULE;  in eqr_probe()
447 	priv->rcdev.dev = dev;  in eqr_probe()
448 	priv->rcdev.of_node = dev->of_node;  in eqr_probe()
450 	if (priv->data->domain_count == 1) {  in eqr_probe()
451 		priv->rcdev.of_reset_n_cells = 1;  in eqr_probe()
452 		priv->rcdev.of_xlate = eqr_of_xlate_onecell;  in eqr_probe()
454 		priv->rcdev.of_reset_n_cells = 2;  in eqr_probe()
455 		priv->rcdev.of_xlate = eqr_of_xlate_twocells;  in eqr_probe()
458 	for (i = 0; i < priv->data->domain_count; i++)  in eqr_probe()
459 		mutex_init(&priv->mutexes[i]);  in eqr_probe()
461 	priv->rcdev.nr_resets = 0;  in eqr_probe()
462 	for (i = 0; i < priv->data->domain_count; i++)  in eqr_probe()
463 		priv->rcdev.nr_resets += hweight32(priv->data->domains[i].valid_mask);  in eqr_probe()
465 	ret = devm_reset_controller_register(dev, &priv->rcdev);  in eqr_probe()
541  * Table describes OLB system-controller compatibles.
545 	{ .compatible = "mobileye,eyeq5-olb", .data = &eqr_eyeq5_data },
546 	{ .compatible = "mobileye,eyeq6l-olb", .data = &eqr_eyeq6l_data },
547 	{ .compatible = "mobileye,eyeq6h-west-olb", .data = &eqr_eyeq6h_we_data },
548 	{ .compatible = "mobileye,eyeq6h-east-olb", .data = &eqr_eyeq6h_we_data },
549 	{ .compatible = "mobileye,eyeq6h-acc-olb", .data = &eqr_eyeq6h_acc_data },