1 // SPDX-License-Identifier: GPL-2.0-only
13 #include <linux/pm.h>
16 #include <linux/amba/bus.h>
19 #include <linux/clk/clk-conf.h>
27 #include <linux/dma-map-ops.h>
38 	uci = table->data;  in amba_cs_uci_id_match()
40 	/* no table data or zero mask - return match on periphid */  in amba_cs_uci_id_match()
41 	if (!uci || (uci->devarch_mask == 0))  in amba_cs_uci_id_match()
45 	ret = (dev->uci.devtype == uci->devtype) &&  in amba_cs_uci_id_match()
46 		((dev->uci.devarch & uci->devarch_mask) == uci->devarch);  in amba_cs_uci_id_match()
53 	while (table->mask) {  in amba_lookup()
54 		if (((dev->periphid & table->mask) == table->id) &&  in amba_lookup()
55 			((dev->cid != CORESIGHT_CID) ||  in amba_lookup()
67 	pcdev->pclk = clk_get(&pcdev->dev, "apb_pclk");  in amba_get_enable_pclk()
68 	if (IS_ERR(pcdev->pclk))  in amba_get_enable_pclk()
69 		return PTR_ERR(pcdev->pclk);  in amba_get_enable_pclk()
71 	ret = clk_prepare_enable(pcdev->pclk);  in amba_get_enable_pclk()
73 		clk_put(pcdev->pclk);  in amba_get_enable_pclk()
80 	clk_disable_unprepare(pcdev->pclk);  in amba_put_disable_pclk()
81 	clk_put(pcdev->pclk);  in amba_put_disable_pclk()
92 	len = sprintf(buf, "%s\n", dev->driver_override);  in driver_override_show()
104 	ret = driver_set_override(_dev, &dev->driver_override, buf, count);  in driver_override_store()
121 amba_attr_func(id, "%08x\n", dev->periphid);
123 	 (unsigned long long)dev->res.start, (unsigned long long)dev->res.end,
124 	 dev->res.flags);
141 	ret = dev_pm_domain_attach(&dev->dev, true);  in amba_read_periphid()
143 		dev_dbg(&dev->dev, "can't get PM domain: %d\n", ret);  in amba_read_periphid()
149 		dev_dbg(&dev->dev, "can't get pclk: %d\n", ret);  in amba_read_periphid()
154 	 * Find reset control(s) of the amba bus and de-assert them.  in amba_read_periphid()
156 	rstc = of_reset_control_array_get_optional_shared(dev->dev.of_node);  in amba_read_periphid()
159 		if (ret != -EPROBE_DEFER)  in amba_read_periphid()
160 			dev_err(&dev->dev, "can't get reset: %d\n", ret);  in amba_read_periphid()
166 	size = resource_size(&dev->res);  in amba_read_periphid()
167 	tmp = ioremap(dev->res.start, size);  in amba_read_periphid()
169 		ret = -ENOMEM;  in amba_read_periphid()
178 		pid |= (readl(tmp + size - 0x20 + 4 * i) & 255) << (i * 8);  in amba_read_periphid()
180 		cid |= (readl(tmp + size - 0x10 + 4 * i) & 255) << (i * 8);  in amba_read_periphid()
184 		void __iomem *csbase = tmp + size - 4096;  in amba_read_periphid()
186 		dev->uci.devarch = readl(csbase + UCI_REG_DEVARCH_OFFSET);  in amba_read_periphid()
187 		dev->uci.devtype = readl(csbase + UCI_REG_DEVTYPE_OFFSET) & 0xff;  in amba_read_periphid()
191 		dev->periphid = pid;  in amba_read_periphid()
192 		dev->cid = cid;  in amba_read_periphid()
195 	if (!dev->periphid)  in amba_read_periphid()
196 		ret = -ENODEV;  in amba_read_periphid()
203 	dev_pm_domain_detach(&dev->dev, true);  in amba_read_periphid()
213 	mutex_lock(&pcdev->periphid_lock);  in amba_match()
214 	if (!pcdev->periphid) {  in amba_match()
218 		 * Returning any error other than -EPROBE_DEFER from bus match  in amba_match()
221 		 * -EPROBE_DEFER.  in amba_match()
224 			mutex_unlock(&pcdev->periphid_lock);  in amba_match()
225 			return -EPROBE_DEFER;  in amba_match()
228 		kobject_uevent(&dev->kobj, KOBJ_ADD);  in amba_match()
230 	mutex_unlock(&pcdev->periphid_lock);  in amba_match()
233 	if (pcdev->driver_override)  in amba_match()
234 		return !strcmp(pcdev->driver_override, drv->name);  in amba_match()
236 	return amba_lookup(pcdrv->id_table, pcdev) != NULL;  in amba_match()
244 	retval = add_uevent_var(env, "AMBA_ID=%08x", pcdev->periphid);  in amba_uevent()
248 	retval = add_uevent_var(env, "MODALIAS=amba:d%08X", pcdev->periphid);  in amba_uevent()
254 	struct device_node *node = dev->dev.of_node;  in of_amba_device_decode_irq()
262 				if (irq == -EPROBE_DEFER)  in of_amba_device_decode_irq()
267 			dev->irq[i] = irq;  in of_amba_device_decode_irq()
281 	struct amba_driver *pcdrv = to_amba_driver(dev->driver);  in amba_probe()
282 	const struct amba_id *id = amba_lookup(pcdrv->id_table, pcdev);  in amba_probe()
290 		ret = of_clk_set_defaults(dev->of_node, false);  in amba_probe()
308 		ret = pcdrv->probe(pcdev, id);  in amba_probe()
326 	struct amba_driver *drv = to_amba_driver(dev->driver);  in amba_remove()
329 	if (drv->remove)  in amba_remove()
330 		drv->remove(pcdev);  in amba_remove()
333 	/* Undo the runtime PM settings in amba_probe() */  in amba_remove()
346 	if (!dev->driver)  in amba_shutdown()
349 	drv = to_amba_driver(dev->driver);  in amba_shutdown()
350 	if (drv->shutdown)  in amba_shutdown()
351 		drv->shutdown(to_amba_device(dev));  in amba_shutdown()
356 	struct amba_driver *drv = to_amba_driver(dev->driver);  in amba_dma_configure()
360 	if (dev->of_node) {  in amba_dma_configure()
361 		ret = of_dma_configure(dev, dev->of_node, true);  in amba_dma_configure()
363 		attr = acpi_get_dma_attr(to_acpi_device_node(dev->fwnode));  in amba_dma_configure()
367 	if (!ret && !drv->driver_managed_dma) {  in amba_dma_configure()
378 	struct amba_driver *drv = to_amba_driver(dev->driver);  in amba_dma_cleanup()
380 	if (!drv->driver_managed_dma)  in amba_dma_cleanup()
386  * Hooks to provide runtime PM of the pclk (bus clock).  It is safe to
387  * enable/disable the bus clock at runtime PM suspend/resume as this
395 	if (ret == 0 && dev->driver) {  in amba_pm_runtime_suspend()
397 			clk_disable(pcdev->pclk);  in amba_pm_runtime_suspend()
399 			clk_disable_unprepare(pcdev->pclk);  in amba_pm_runtime_suspend()
410 	if (dev->driver) {  in amba_pm_runtime_resume()
412 			ret = clk_enable(pcdev->pclk);  in amba_pm_runtime_resume()
414 			ret = clk_prepare_enable(pcdev->pclk);  in amba_pm_runtime_resume()
433  * Primecells are part of the Advanced Microcontroller Bus Architecture,
434  * so we call the bus "amba".
435  * DMA configuration for platform and AMBA bus is same. So here we reuse
448 	.pm		= &amba_pm,
463 	return -ENODEV;  in amba_proxy_probe()
472 		.name = "amba-proxy",
486 	 * only loaded based on uevents, then we'll hit a chicken-and-egg  in amba_stub_drv_init()
496  *	__amba_driver_register - register an AMBA device driver
501  *	core.  If devices pre-exist, the drivers probe function will
507 	if (!drv->probe)  in __amba_driver_register()
508 		return -EINVAL;  in __amba_driver_register()
510 	drv->drv.owner = owner;  in __amba_driver_register()
511 	drv->drv.bus = &amba_bustype;  in __amba_driver_register()
513 	return driver_register(&drv->drv);  in __amba_driver_register()
518  *	amba_driver_unregister - remove an AMBA device driver
527 	driver_unregister(&drv->drv);  in amba_driver_unregister()
535 	fwnode_handle_put(dev_fwnode(&d->dev));  in amba_device_release()
536 	if (d->res.parent)  in amba_device_release()
537 		release_resource(&d->res);  in amba_device_release()
538 	mutex_destroy(&d->periphid_lock);  in amba_device_release()
543  *	amba_device_add - add a previously allocated AMBA device structure
555 	fwnode_handle_get(dev_fwnode(&dev->dev));  in amba_device_add()
557 	ret = request_resource(parent, &dev->res);  in amba_device_add()
561 	/* If primecell ID isn't hard-coded, figure it out */  in amba_device_add()
562 	if (!dev->periphid) {  in amba_device_add()
572 			dev_set_uevent_suppress(&dev->dev, true);  in amba_device_add()
575 	ret = device_add(&dev->dev);  in amba_device_add()
577 		release_resource(&dev->res);  in amba_device_add()
585 	device_initialize(&dev->dev);  in amba_device_initialize()
587 		dev_set_name(&dev->dev, "%s", name);  in amba_device_initialize()
588 	dev->dev.release = amba_device_release;  in amba_device_initialize()
589 	dev->dev.bus = &amba_bustype;  in amba_device_initialize()
590 	dev->dev.dma_mask = &dev->dev.coherent_dma_mask;  in amba_device_initialize()
591 	dev->dev.dma_parms = &dev->dma_parms;  in amba_device_initialize()
592 	dev->res.name = dev_name(&dev->dev);  in amba_device_initialize()
593 	mutex_init(&dev->periphid_lock);  in amba_device_initialize()
597  *	amba_device_alloc - allocate an AMBA device
613 		dev->res.start = base;  in amba_device_alloc()
614 		dev->res.end = base + size - 1;  in amba_device_alloc()
615 		dev->res.flags = IORESOURCE_MEM;  in amba_device_alloc()
623  *	amba_device_register - register an AMBA device
633 	amba_device_initialize(dev, dev->dev.init_name);  in amba_device_register()
634 	dev->dev.init_name = NULL;  in amba_device_register()
641  *	amba_device_put - put an AMBA device
646 	put_device(&dev->dev);  in amba_device_put()
651  *	amba_device_unregister - unregister an AMBA device
663 	device_unregister(&dev->dev);  in amba_device_unregister()
668  *	amba_request_regions - request all mem regions associated with device
678 		name = dev->dev.driver->name;  in amba_request_regions()
680 	size = resource_size(&dev->res);  in amba_request_regions()
682 	if (!request_mem_region(dev->res.start, size, name))  in amba_request_regions()
683 		ret = -EBUSY;  in amba_request_regions()
690  *	amba_release_regions - release mem regions associated with device
699 	size = resource_size(&dev->res);  in amba_release_regions()
700 	release_mem_region(dev->res.start, size);  in amba_release_regions()