xref: /openbmc/linux/drivers/usb/host/xhci-plat.c (revision 20e2fc42) 
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * xhci-plat.c - xHCI host controller driver platform Bus Glue.
4  *
5  * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com
6  * Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
7  *
8  * A lot of code borrowed from the Linux xHCI driver.
9  */
10 
11 #include <linux/clk.h>
12 #include <linux/dma-mapping.h>
13 #include <linux/module.h>
14 #include <linux/pci.h>
15 #include <linux/of.h>
16 #include <linux/of_device.h>
17 #include <linux/platform_device.h>
18 #include <linux/usb/phy.h>
19 #include <linux/slab.h>
20 #include <linux/acpi.h>
21 #include <linux/usb/of.h>
22 
23 #include "xhci.h"
24 #include "xhci-plat.h"
25 #include "xhci-mvebu.h"
26 #include "xhci-rcar.h"
27 
28 static struct hc_driver __read_mostly xhci_plat_hc_driver;
29 
30 static int xhci_plat_setup(struct usb_hcd *hcd);
31 static int xhci_plat_start(struct usb_hcd *hcd);
32 
33 static const struct xhci_driver_overrides xhci_plat_overrides __initconst = {
34 	.extra_priv_size = sizeof(struct xhci_plat_priv),
35 	.reset = xhci_plat_setup,
36 	.start = xhci_plat_start,
37 };
38 
39 static void xhci_priv_plat_start(struct usb_hcd *hcd)
40 {
41 	struct xhci_plat_priv *priv = hcd_to_xhci_priv(hcd);
42 
43 	if (priv->plat_start)
44 		priv->plat_start(hcd);
45 }
46 
47 static int xhci_priv_init_quirk(struct usb_hcd *hcd)
48 {
49 	struct xhci_plat_priv *priv = hcd_to_xhci_priv(hcd);
50 
51 	if (!priv->init_quirk)
52 		return 0;
53 
54 	return priv->init_quirk(hcd);
55 }
56 
57 static int xhci_priv_resume_quirk(struct usb_hcd *hcd)
58 {
59 	struct xhci_plat_priv *priv = hcd_to_xhci_priv(hcd);
60 
61 	if (!priv->resume_quirk)
62 		return 0;
63 
64 	return priv->resume_quirk(hcd);
65 }
66 
67 static void xhci_plat_quirks(struct device *dev, struct xhci_hcd *xhci)
68 {
69 	struct xhci_plat_priv *priv = xhci_to_priv(xhci);
70 
71 	/*
72 	 * As of now platform drivers don't provide MSI support so we ensure
73 	 * here that the generic code does not try to make a pci_dev from our
74 	 * dev struct in order to setup MSI
75 	 */
76 	xhci->quirks |= XHCI_PLAT | priv->quirks;
77 }
78 
79 /* called during probe() after chip reset completes */
80 static int xhci_plat_setup(struct usb_hcd *hcd)
81 {
82 	int ret;
83 
84 
85 	ret = xhci_priv_init_quirk(hcd);
86 	if (ret)
87 		return ret;
88 
89 	return xhci_gen_setup(hcd, xhci_plat_quirks);
90 }
91 
92 static int xhci_plat_start(struct usb_hcd *hcd)
93 {
94 	xhci_priv_plat_start(hcd);
95 	return xhci_run(hcd);
96 }
97 
98 #ifdef CONFIG_OF
99 static const struct xhci_plat_priv xhci_plat_marvell_armada = {
100 	.init_quirk = xhci_mvebu_mbus_init_quirk,
101 };
102 
103 static const struct xhci_plat_priv xhci_plat_marvell_armada3700 = {
104 	.init_quirk = xhci_mvebu_a3700_init_quirk,
105 };
106 
107 static const struct xhci_plat_priv xhci_plat_renesas_rcar_gen2 = {
108 	SET_XHCI_PLAT_PRIV_FOR_RCAR(XHCI_RCAR_FIRMWARE_NAME_V1)
109 };
110 
111 static const struct xhci_plat_priv xhci_plat_renesas_rcar_gen3 = {
112 	SET_XHCI_PLAT_PRIV_FOR_RCAR(XHCI_RCAR_FIRMWARE_NAME_V3)
113 };
114 
115 static const struct of_device_id usb_xhci_of_match[] = {
116 	{
117 		.compatible = "generic-xhci",
118 	}, {
119 		.compatible = "xhci-platform",
120 	}, {
121 		.compatible = "marvell,armada-375-xhci",
122 		.data = &xhci_plat_marvell_armada,
123 	}, {
124 		.compatible = "marvell,armada-380-xhci",
125 		.data = &xhci_plat_marvell_armada,
126 	}, {
127 		.compatible = "marvell,armada3700-xhci",
128 		.data = &xhci_plat_marvell_armada3700,
129 	}, {
130 		.compatible = "renesas,xhci-r8a7790",
131 		.data = &xhci_plat_renesas_rcar_gen2,
132 	}, {
133 		.compatible = "renesas,xhci-r8a7791",
134 		.data = &xhci_plat_renesas_rcar_gen2,
135 	}, {
136 		.compatible = "renesas,xhci-r8a7793",
137 		.data = &xhci_plat_renesas_rcar_gen2,
138 	}, {
139 		.compatible = "renesas,xhci-r8a7795",
140 		.data = &xhci_plat_renesas_rcar_gen3,
141 	}, {
142 		.compatible = "renesas,xhci-r8a7796",
143 		.data = &xhci_plat_renesas_rcar_gen3,
144 	}, {
145 		.compatible = "renesas,rcar-gen2-xhci",
146 		.data = &xhci_plat_renesas_rcar_gen2,
147 	}, {
148 		.compatible = "renesas,rcar-gen3-xhci",
149 		.data = &xhci_plat_renesas_rcar_gen3,
150 	},
151 	{},
152 };
153 MODULE_DEVICE_TABLE(of, usb_xhci_of_match);
154 #endif
155 
156 static int xhci_plat_probe(struct platform_device *pdev)
157 {
158 	const struct xhci_plat_priv *priv_match;
159 	const struct hc_driver	*driver;
160 	struct device		*sysdev, *tmpdev;
161 	struct xhci_hcd		*xhci;
162 	struct resource         *res;
163 	struct usb_hcd		*hcd;
164 	int			ret;
165 	int			irq;
166 
167 	if (usb_disabled())
168 		return -ENODEV;
169 
170 	driver = &xhci_plat_hc_driver;
171 
172 	irq = platform_get_irq(pdev, 0);
173 	if (irq < 0)
174 		return irq;
175 
176 	/*
177 	 * sysdev must point to a device that is known to the system firmware
178 	 * or PCI hardware. We handle these three cases here:
179 	 * 1. xhci_plat comes from firmware
180 	 * 2. xhci_plat is child of a device from firmware (dwc3-plat)
181 	 * 3. xhci_plat is grandchild of a pci device (dwc3-pci)
182 	 */
183 	for (sysdev = &pdev->dev; sysdev; sysdev = sysdev->parent) {
184 		if (is_of_node(sysdev->fwnode) ||
185 			is_acpi_device_node(sysdev->fwnode))
186 			break;
187 #ifdef CONFIG_PCI
188 		else if (sysdev->bus == &pci_bus_type)
189 			break;
190 #endif
191 	}
192 
193 	if (!sysdev)
194 		sysdev = &pdev->dev;
195 
196 	/* Try to set 64-bit DMA first */
197 	if (WARN_ON(!sysdev->dma_mask))
198 		/* Platform did not initialize dma_mask */
199 		ret = dma_coerce_mask_and_coherent(sysdev,
200 						   DMA_BIT_MASK(64));
201 	else
202 		ret = dma_set_mask_and_coherent(sysdev, DMA_BIT_MASK(64));
203 
204 	/* If seting 64-bit DMA mask fails, fall back to 32-bit DMA mask */
205 	if (ret) {
206 		ret = dma_set_mask_and_coherent(sysdev, DMA_BIT_MASK(32));
207 		if (ret)
208 			return ret;
209 	}
210 
211 	pm_runtime_set_active(&pdev->dev);
212 	pm_runtime_enable(&pdev->dev);
213 	pm_runtime_get_noresume(&pdev->dev);
214 
215 	hcd = __usb_create_hcd(driver, sysdev, &pdev->dev,
216 			       dev_name(&pdev->dev), NULL);
217 	if (!hcd) {
218 		ret = -ENOMEM;
219 		goto disable_runtime;
220 	}
221 
222 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
223 	hcd->regs = devm_ioremap_resource(&pdev->dev, res);
224 	if (IS_ERR(hcd->regs)) {
225 		ret = PTR_ERR(hcd->regs);
226 		goto put_hcd;
227 	}
228 
229 	hcd->rsrc_start = res->start;
230 	hcd->rsrc_len = resource_size(res);
231 
232 	xhci = hcd_to_xhci(hcd);
233 
234 	/*
235 	 * Not all platforms have clks so it is not an error if the
236 	 * clock do not exist.
237 	 */
238 	xhci->reg_clk = devm_clk_get_optional(&pdev->dev, "reg");
239 	if (IS_ERR(xhci->reg_clk)) {
240 		ret = PTR_ERR(xhci->reg_clk);
241 		goto put_hcd;
242 	}
243 
244 	ret = clk_prepare_enable(xhci->reg_clk);
245 	if (ret)
246 		goto put_hcd;
247 
248 	xhci->clk = devm_clk_get_optional(&pdev->dev, NULL);
249 	if (IS_ERR(xhci->clk)) {
250 		ret = PTR_ERR(xhci->clk);
251 		goto disable_reg_clk;
252 	}
253 
254 	ret = clk_prepare_enable(xhci->clk);
255 	if (ret)
256 		goto disable_reg_clk;
257 
258 	priv_match = of_device_get_match_data(&pdev->dev);
259 	if (priv_match) {
260 		struct xhci_plat_priv *priv = hcd_to_xhci_priv(hcd);
261 
262 		/* Just copy data for now */
263 		if (priv_match)
264 			*priv = *priv_match;
265 	}
266 
267 	device_wakeup_enable(hcd->self.controller);
268 
269 	xhci->main_hcd = hcd;
270 	xhci->shared_hcd = __usb_create_hcd(driver, sysdev, &pdev->dev,
271 			dev_name(&pdev->dev), hcd);
272 	if (!xhci->shared_hcd) {
273 		ret = -ENOMEM;
274 		goto disable_clk;
275 	}
276 
277 	/* imod_interval is the interrupt moderation value in nanoseconds. */
278 	xhci->imod_interval = 40000;
279 
280 	/* Iterate over all parent nodes for finding quirks */
281 	for (tmpdev = &pdev->dev; tmpdev; tmpdev = tmpdev->parent) {
282 
283 		if (device_property_read_bool(tmpdev, "usb2-lpm-disable"))
284 			xhci->quirks |= XHCI_HW_LPM_DISABLE;
285 
286 		if (device_property_read_bool(tmpdev, "usb3-lpm-capable"))
287 			xhci->quirks |= XHCI_LPM_SUPPORT;
288 
289 		if (device_property_read_bool(tmpdev, "quirk-broken-port-ped"))
290 			xhci->quirks |= XHCI_BROKEN_PORT_PED;
291 
292 		device_property_read_u32(tmpdev, "imod-interval-ns",
293 					 &xhci->imod_interval);
294 	}
295 
296 	hcd->usb_phy = devm_usb_get_phy_by_phandle(sysdev, "usb-phy", 0);
297 	if (IS_ERR(hcd->usb_phy)) {
298 		ret = PTR_ERR(hcd->usb_phy);
299 		if (ret == -EPROBE_DEFER)
300 			goto put_usb3_hcd;
301 		hcd->usb_phy = NULL;
302 	} else {
303 		ret = usb_phy_init(hcd->usb_phy);
304 		if (ret)
305 			goto put_usb3_hcd;
306 	}
307 
308 	hcd->tpl_support = of_usb_host_tpl_support(sysdev->of_node);
309 	xhci->shared_hcd->tpl_support = hcd->tpl_support;
310 	ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
311 	if (ret)
312 		goto disable_usb_phy;
313 
314 	if (HCC_MAX_PSA(xhci->hcc_params) >= 4)
315 		xhci->shared_hcd->can_do_streams = 1;
316 
317 	ret = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED);
318 	if (ret)
319 		goto dealloc_usb2_hcd;
320 
321 	device_enable_async_suspend(&pdev->dev);
322 	pm_runtime_put_noidle(&pdev->dev);
323 
324 	/*
325 	 * Prevent runtime pm from being on as default, users should enable
326 	 * runtime pm using power/control in sysfs.
327 	 */
328 	pm_runtime_forbid(&pdev->dev);
329 
330 	return 0;
331 
332 
333 dealloc_usb2_hcd:
334 	usb_remove_hcd(hcd);
335 
336 disable_usb_phy:
337 	usb_phy_shutdown(hcd->usb_phy);
338 
339 put_usb3_hcd:
340 	usb_put_hcd(xhci->shared_hcd);
341 
342 disable_clk:
343 	clk_disable_unprepare(xhci->clk);
344 
345 disable_reg_clk:
346 	clk_disable_unprepare(xhci->reg_clk);
347 
348 put_hcd:
349 	usb_put_hcd(hcd);
350 
351 disable_runtime:
352 	pm_runtime_put_noidle(&pdev->dev);
353 	pm_runtime_disable(&pdev->dev);
354 
355 	return ret;
356 }
357 
358 static int xhci_plat_remove(struct platform_device *dev)
359 {
360 	struct usb_hcd	*hcd = platform_get_drvdata(dev);
361 	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
362 	struct clk *clk = xhci->clk;
363 	struct clk *reg_clk = xhci->reg_clk;
364 	struct usb_hcd *shared_hcd = xhci->shared_hcd;
365 
366 	xhci->xhc_state |= XHCI_STATE_REMOVING;
367 
368 	usb_remove_hcd(shared_hcd);
369 	xhci->shared_hcd = NULL;
370 	usb_phy_shutdown(hcd->usb_phy);
371 
372 	usb_remove_hcd(hcd);
373 	usb_put_hcd(shared_hcd);
374 
375 	clk_disable_unprepare(clk);
376 	clk_disable_unprepare(reg_clk);
377 	usb_put_hcd(hcd);
378 
379 	pm_runtime_set_suspended(&dev->dev);
380 	pm_runtime_disable(&dev->dev);
381 
382 	return 0;
383 }
384 
385 static int __maybe_unused xhci_plat_suspend(struct device *dev)
386 {
387 	struct usb_hcd	*hcd = dev_get_drvdata(dev);
388 	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
389 
390 	/*
391 	 * xhci_suspend() needs `do_wakeup` to know whether host is allowed
392 	 * to do wakeup during suspend. Since xhci_plat_suspend is currently
393 	 * only designed for system suspend, device_may_wakeup() is enough
394 	 * to dertermine whether host is allowed to do wakeup. Need to
395 	 * reconsider this when xhci_plat_suspend enlarges its scope, e.g.,
396 	 * also applies to runtime suspend.
397 	 */
398 	return xhci_suspend(xhci, device_may_wakeup(dev));
399 }
400 
401 static int __maybe_unused xhci_plat_resume(struct device *dev)
402 {
403 	struct usb_hcd	*hcd = dev_get_drvdata(dev);
404 	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
405 	int ret;
406 
407 	ret = xhci_priv_resume_quirk(hcd);
408 	if (ret)
409 		return ret;
410 
411 	return xhci_resume(xhci, 0);
412 }
413 
414 static int __maybe_unused xhci_plat_runtime_suspend(struct device *dev)
415 {
416 	struct usb_hcd  *hcd = dev_get_drvdata(dev);
417 	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
418 
419 	return xhci_suspend(xhci, true);
420 }
421 
422 static int __maybe_unused xhci_plat_runtime_resume(struct device *dev)
423 {
424 	struct usb_hcd  *hcd = dev_get_drvdata(dev);
425 	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
426 
427 	return xhci_resume(xhci, 0);
428 }
429 
430 static const struct dev_pm_ops xhci_plat_pm_ops = {
431 	SET_SYSTEM_SLEEP_PM_OPS(xhci_plat_suspend, xhci_plat_resume)
432 
433 	SET_RUNTIME_PM_OPS(xhci_plat_runtime_suspend,
434 			   xhci_plat_runtime_resume,
435 			   NULL)
436 };
437 
438 static const struct acpi_device_id usb_xhci_acpi_match[] = {
439 	/* XHCI-compliant USB Controller */
440 	{ "PNP0D10", },
441 	{ }
442 };
443 MODULE_DEVICE_TABLE(acpi, usb_xhci_acpi_match);
444 
445 static struct platform_driver usb_xhci_driver = {
446 	.probe	= xhci_plat_probe,
447 	.remove	= xhci_plat_remove,
448 	.driver	= {
449 		.name = "xhci-hcd",
450 		.pm = &xhci_plat_pm_ops,
451 		.of_match_table = of_match_ptr(usb_xhci_of_match),
452 		.acpi_match_table = ACPI_PTR(usb_xhci_acpi_match),
453 	},
454 };
455 MODULE_ALIAS("platform:xhci-hcd");
456 
457 static int __init xhci_plat_init(void)
458 {
459 	xhci_init_driver(&xhci_plat_hc_driver, &xhci_plat_overrides);
460 	return platform_driver_register(&usb_xhci_driver);
461 }
462 module_init(xhci_plat_init);
463 
464 static void __exit xhci_plat_exit(void)
465 {
466 	platform_driver_unregister(&usb_xhci_driver);
467 }
468 module_exit(xhci_plat_exit);
469 
470 MODULE_DESCRIPTION("xHCI Platform Host Controller Driver");
471 MODULE_LICENSE("GPL");
472