xref: /openbmc/linux/drivers/usb/host/ohci-omap.c (revision e399d014)
1 // SPDX-License-Identifier: GPL-1.0+
2 /*
3  * OHCI HCD (Host Controller Driver) for USB.
4  *
5  * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
6  * (C) Copyright 2000-2005 David Brownell
7  * (C) Copyright 2002 Hewlett-Packard Company
8  *
9  * OMAP Bus Glue
10  *
11  * Modified for OMAP by Tony Lindgren <tony@atomide.com>
12  * Based on the 2.4 OMAP OHCI driver originally done by MontaVista Software Inc.
13  * and on ohci-sa1111.c by Christopher Hoover <ch@hpl.hp.com>
14  *
15  * This file is licenced under the GPL.
16  */
17 
18 #include <linux/clk.h>
19 #include <linux/dma-mapping.h>
20 #include <linux/err.h>
21 #include <linux/gpio/consumer.h>
22 #include <linux/io.h>
23 #include <linux/jiffies.h>
24 #include <linux/kernel.h>
25 #include <linux/module.h>
26 #include <linux/usb/otg.h>
27 #include <linux/platform_device.h>
28 #include <linux/platform_data/usb-omap1.h>
29 #include <linux/soc/ti/omap1-usb.h>
30 #include <linux/soc/ti/omap1-mux.h>
31 #include <linux/soc/ti/omap1-soc.h>
32 #include <linux/soc/ti/omap1-io.h>
33 #include <linux/signal.h>
34 #include <linux/usb.h>
35 #include <linux/usb/hcd.h>
36 
37 #include "ohci.h"
38 
39 #include <asm/io.h>
40 #include <asm/mach-types.h>
41 
42 #define DRIVER_DESC "OHCI OMAP driver"
43 
44 struct ohci_omap_priv {
45 	struct clk *usb_host_ck;
46 	struct clk *usb_dc_ck;
47 	struct gpio_desc *power;
48 	struct gpio_desc *overcurrent;
49 };
50 
51 static const char hcd_name[] = "ohci-omap";
52 static struct hc_driver __read_mostly ohci_omap_hc_driver;
53 
54 #define hcd_to_ohci_omap_priv(h) \
55 	((struct ohci_omap_priv *)hcd_to_ohci(h)->priv)
56 
omap_ohci_clock_power(struct ohci_omap_priv * priv,int on)57 static void omap_ohci_clock_power(struct ohci_omap_priv *priv, int on)
58 {
59 	if (on) {
60 		clk_enable(priv->usb_dc_ck);
61 		clk_enable(priv->usb_host_ck);
62 		/* guesstimate for T5 == 1x 32K clock + APLL lock time */
63 		udelay(100);
64 	} else {
65 		clk_disable(priv->usb_host_ck);
66 		clk_disable(priv->usb_dc_ck);
67 	}
68 }
69 
start_hnp(struct ohci_hcd * ohci)70 static void start_hnp(struct ohci_hcd *ohci)
71 {
72 	struct usb_hcd *hcd = ohci_to_hcd(ohci);
73 	const unsigned	port = hcd->self.otg_port - 1;
74 	unsigned long	flags;
75 	u32 l;
76 
77 	otg_start_hnp(hcd->usb_phy->otg);
78 
79 	local_irq_save(flags);
80 	hcd->usb_phy->otg->state = OTG_STATE_A_SUSPEND;
81 	writel (RH_PS_PSS, &ohci->regs->roothub.portstatus [port]);
82 	l = omap_readl(OTG_CTRL);
83 	l &= ~OTG_A_BUSREQ;
84 	omap_writel(l, OTG_CTRL);
85 	local_irq_restore(flags);
86 }
87 
88 /*-------------------------------------------------------------------------*/
89 
ohci_omap_reset(struct usb_hcd * hcd)90 static int ohci_omap_reset(struct usb_hcd *hcd)
91 {
92 	struct ohci_hcd		*ohci = hcd_to_ohci(hcd);
93 	struct omap_usb_config	*config = dev_get_platdata(hcd->self.controller);
94 	struct ohci_omap_priv	*priv = hcd_to_ohci_omap_priv(hcd);
95 	int			need_transceiver = (config->otg != 0);
96 	int			ret;
97 
98 	dev_dbg(hcd->self.controller, "starting USB Controller\n");
99 
100 	if (config->otg) {
101 		hcd->self.otg_port = config->otg;
102 		/* default/minimum OTG power budget:  8 mA */
103 		hcd->power_budget = 8;
104 	}
105 
106 	/* XXX OMAP16xx only */
107 	if (config->ocpi_enable)
108 		config->ocpi_enable();
109 
110 	if (IS_ENABLED(CONFIG_USB_OTG) && need_transceiver) {
111 		hcd->usb_phy = usb_get_phy(USB_PHY_TYPE_USB2);
112 		if (!IS_ERR_OR_NULL(hcd->usb_phy)) {
113 			int	status = otg_set_host(hcd->usb_phy->otg,
114 						&ohci_to_hcd(ohci)->self);
115 			dev_dbg(hcd->self.controller, "init %s phy, status %d\n",
116 					hcd->usb_phy->label, status);
117 			if (status) {
118 				usb_put_phy(hcd->usb_phy);
119 				return status;
120 			}
121 		} else {
122 			return -EPROBE_DEFER;
123 		}
124 		hcd->skip_phy_initialization = 1;
125 		ohci->start_hnp = start_hnp;
126 	}
127 
128 	omap_ohci_clock_power(priv, 1);
129 
130 	if (config->lb_reset)
131 		config->lb_reset();
132 
133 	ret = ohci_setup(hcd);
134 	if (ret < 0)
135 		return ret;
136 
137 	if (config->otg || config->rwc) {
138 		ohci->hc_control = OHCI_CTRL_RWC;
139 		writel(OHCI_CTRL_RWC, &ohci->regs->control);
140 	}
141 
142 	/* board-specific power switching and overcurrent support */
143 	if (machine_is_omap_osk()) {
144 		u32	rh = roothub_a (ohci);
145 
146 		/* power switching (ganged by default) */
147 		rh &= ~RH_A_NPS;
148 
149 		/* TPS2045 switch for internal transceiver (port 1) */
150 		if (machine_is_omap_osk()) {
151 			ohci_to_hcd(ohci)->power_budget = 250;
152 
153 			rh &= ~RH_A_NOCP;
154 
155 			/* gpio9 for overcurrent detction */
156 			omap_cfg_reg(W8_1610_GPIO9);
157 
158 			/* for paranoia's sake:  disable USB.PUEN */
159 			omap_cfg_reg(W4_USB_HIGHZ);
160 		}
161 		ohci_writel(ohci, rh, &ohci->regs->roothub.a);
162 		ohci->flags &= ~OHCI_QUIRK_HUB_POWER;
163 	} else if (machine_is_nokia770()) {
164 		/* We require a self-powered hub, which should have
165 		 * plenty of power. */
166 		ohci_to_hcd(ohci)->power_budget = 0;
167 	}
168 
169 	/* FIXME hub_wq hub requests should manage power switching */
170 	if (config->transceiver_power)
171 		return config->transceiver_power(1);
172 
173 	if (priv->power)
174 		gpiod_set_value_cansleep(priv->power, 0);
175 
176 	/* board init will have already handled HMC and mux setup.
177 	 * any external transceiver should already be initialized
178 	 * too, so all configured ports use the right signaling now.
179 	 */
180 
181 	return 0;
182 }
183 
184 /*-------------------------------------------------------------------------*/
185 
186 /**
187  * ohci_hcd_omap_probe - initialize OMAP-based HCDs
188  * @pdev:	USB controller to probe
189  *
190  * Context: task context, might sleep
191  *
192  * Allocates basic resources for this USB host controller, and
193  * then invokes the start() method for the HCD associated with it
194  * through the hotplug entry's driver_data.
195  */
ohci_hcd_omap_probe(struct platform_device * pdev)196 static int ohci_hcd_omap_probe(struct platform_device *pdev)
197 {
198 	int retval, irq;
199 	struct usb_hcd *hcd = 0;
200 	struct ohci_omap_priv *priv;
201 
202 	if (pdev->num_resources != 2) {
203 		dev_err(&pdev->dev, "invalid num_resources: %i\n",
204 		       pdev->num_resources);
205 		return -ENODEV;
206 	}
207 
208 	if (pdev->resource[0].flags != IORESOURCE_MEM
209 			|| pdev->resource[1].flags != IORESOURCE_IRQ) {
210 		dev_err(&pdev->dev, "invalid resource type\n");
211 		return -ENODEV;
212 	}
213 
214 	hcd = usb_create_hcd(&ohci_omap_hc_driver, &pdev->dev,
215 			dev_name(&pdev->dev));
216 	if (!hcd)
217 		return -ENOMEM;
218 
219 	hcd->rsrc_start = pdev->resource[0].start;
220 	hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1;
221 	priv = hcd_to_ohci_omap_priv(hcd);
222 
223 	/* Obtain two optional GPIO lines */
224 	priv->power = devm_gpiod_get_optional(&pdev->dev, "power", GPIOD_ASIS);
225 	if (IS_ERR(priv->power)) {
226 		retval = PTR_ERR(priv->power);
227 		goto err_put_hcd;
228 	}
229 	if (priv->power)
230 		gpiod_set_consumer_name(priv->power, "OHCI power");
231 
232 	/*
233 	 * This "overcurrent" GPIO line isn't really used in the code,
234 	 * but has a designated hardware function.
235 	 * TODO: implement proper overcurrent handling.
236 	 */
237 	priv->overcurrent = devm_gpiod_get_optional(&pdev->dev, "overcurrent",
238 						    GPIOD_IN);
239 	if (IS_ERR(priv->overcurrent)) {
240 		retval = PTR_ERR(priv->overcurrent);
241 		goto err_put_hcd;
242 	}
243 	if (priv->overcurrent)
244 		gpiod_set_consumer_name(priv->overcurrent, "OHCI overcurrent");
245 
246 	priv->usb_host_ck = clk_get(&pdev->dev, "usb_hhc_ck");
247 	if (IS_ERR(priv->usb_host_ck)) {
248 		retval = PTR_ERR(priv->usb_host_ck);
249 		goto err_put_hcd;
250 	}
251 
252 	retval = clk_prepare(priv->usb_host_ck);
253 	if (retval)
254 		goto err_put_host_ck;
255 
256 	if (!cpu_is_omap15xx())
257 		priv->usb_dc_ck = clk_get(&pdev->dev, "usb_dc_ck");
258 	else
259 		priv->usb_dc_ck = clk_get(&pdev->dev, "lb_ck");
260 
261 	if (IS_ERR(priv->usb_dc_ck)) {
262 		retval = PTR_ERR(priv->usb_dc_ck);
263 		goto err_unprepare_host_ck;
264 	}
265 
266 	retval = clk_prepare(priv->usb_dc_ck);
267 	if (retval)
268 		goto err_put_dc_ck;
269 
270 	if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
271 		dev_dbg(&pdev->dev, "request_mem_region failed\n");
272 		retval = -EBUSY;
273 		goto err_unprepare_dc_ck;
274 	}
275 
276 	hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
277 	if (!hcd->regs) {
278 		dev_err(&pdev->dev, "can't ioremap OHCI HCD\n");
279 		retval = -ENOMEM;
280 		goto err2;
281 	}
282 
283 	irq = platform_get_irq(pdev, 0);
284 	if (irq < 0) {
285 		retval = irq;
286 		goto err3;
287 	}
288 	retval = usb_add_hcd(hcd, irq, 0);
289 	if (retval)
290 		goto err3;
291 
292 	device_wakeup_enable(hcd->self.controller);
293 	return 0;
294 err3:
295 	iounmap(hcd->regs);
296 err2:
297 	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
298 err_unprepare_dc_ck:
299 	clk_unprepare(priv->usb_dc_ck);
300 err_put_dc_ck:
301 	clk_put(priv->usb_dc_ck);
302 err_unprepare_host_ck:
303 	clk_unprepare(priv->usb_host_ck);
304 err_put_host_ck:
305 	clk_put(priv->usb_host_ck);
306 err_put_hcd:
307 	usb_put_hcd(hcd);
308 	return retval;
309 }
310 
311 
312 /* may be called with controller, bus, and devices active */
313 
314 /**
315  * ohci_hcd_omap_remove - shutdown processing for OMAP-based HCDs
316  * @pdev: USB Host Controller being removed
317  *
318  * Context: task context, might sleep
319  *
320  * Reverses the effect of ohci_hcd_omap_probe(), first invoking
321  * the HCD's stop() method.  It is always called from a thread
322  * context, normally "rmmod", "apmd", or something similar.
323  */
ohci_hcd_omap_remove(struct platform_device * pdev)324 static void ohci_hcd_omap_remove(struct platform_device *pdev)
325 {
326 	struct usb_hcd	*hcd = platform_get_drvdata(pdev);
327 	struct ohci_omap_priv *priv = hcd_to_ohci_omap_priv(hcd);
328 
329 	dev_dbg(hcd->self.controller, "stopping USB Controller\n");
330 	usb_remove_hcd(hcd);
331 	omap_ohci_clock_power(priv, 0);
332 	if (!IS_ERR_OR_NULL(hcd->usb_phy)) {
333 		(void) otg_set_host(hcd->usb_phy->otg, 0);
334 		usb_put_phy(hcd->usb_phy);
335 	}
336 	iounmap(hcd->regs);
337 	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
338 	clk_unprepare(priv->usb_dc_ck);
339 	clk_put(priv->usb_dc_ck);
340 	clk_unprepare(priv->usb_host_ck);
341 	clk_put(priv->usb_host_ck);
342 	usb_put_hcd(hcd);
343 }
344 
345 /*-------------------------------------------------------------------------*/
346 
347 #ifdef	CONFIG_PM
348 
ohci_omap_suspend(struct platform_device * pdev,pm_message_t message)349 static int ohci_omap_suspend(struct platform_device *pdev, pm_message_t message)
350 {
351 	struct usb_hcd *hcd = platform_get_drvdata(pdev);
352 	struct ohci_hcd *ohci = hcd_to_ohci(hcd);
353 	struct ohci_omap_priv *priv = hcd_to_ohci_omap_priv(hcd);
354 	bool do_wakeup = device_may_wakeup(&pdev->dev);
355 	int ret;
356 
357 	if (time_before(jiffies, ohci->next_statechange))
358 		msleep(5);
359 	ohci->next_statechange = jiffies;
360 
361 	ret = ohci_suspend(hcd, do_wakeup);
362 	if (ret)
363 		return ret;
364 
365 	omap_ohci_clock_power(priv, 0);
366 	return ret;
367 }
368 
ohci_omap_resume(struct platform_device * dev)369 static int ohci_omap_resume(struct platform_device *dev)
370 {
371 	struct usb_hcd	*hcd = platform_get_drvdata(dev);
372 	struct ohci_hcd	*ohci = hcd_to_ohci(hcd);
373 	struct ohci_omap_priv *priv = hcd_to_ohci_omap_priv(hcd);
374 
375 	if (time_before(jiffies, ohci->next_statechange))
376 		msleep(5);
377 	ohci->next_statechange = jiffies;
378 
379 	omap_ohci_clock_power(priv, 1);
380 	ohci_resume(hcd, false);
381 	return 0;
382 }
383 
384 #endif
385 
386 /*-------------------------------------------------------------------------*/
387 
388 /*
389  * Driver definition to register with the OMAP bus
390  */
391 static struct platform_driver ohci_hcd_omap_driver = {
392 	.probe		= ohci_hcd_omap_probe,
393 	.remove_new	= ohci_hcd_omap_remove,
394 	.shutdown	= usb_hcd_platform_shutdown,
395 #ifdef	CONFIG_PM
396 	.suspend	= ohci_omap_suspend,
397 	.resume		= ohci_omap_resume,
398 #endif
399 	.driver		= {
400 		.name	= "ohci",
401 	},
402 };
403 
404 static const struct ohci_driver_overrides omap_overrides __initconst = {
405 	.product_desc	= "OMAP OHCI",
406 	.reset		= ohci_omap_reset,
407 	.extra_priv_size = sizeof(struct ohci_omap_priv),
408 };
409 
ohci_omap_init(void)410 static int __init ohci_omap_init(void)
411 {
412 	if (usb_disabled())
413 		return -ENODEV;
414 
415 	ohci_init_driver(&ohci_omap_hc_driver, &omap_overrides);
416 	return platform_driver_register(&ohci_hcd_omap_driver);
417 }
418 module_init(ohci_omap_init);
419 
ohci_omap_cleanup(void)420 static void __exit ohci_omap_cleanup(void)
421 {
422 	platform_driver_unregister(&ohci_hcd_omap_driver);
423 }
424 module_exit(ohci_omap_cleanup);
425 
426 MODULE_DESCRIPTION(DRIVER_DESC);
427 MODULE_ALIAS("platform:ohci");
428 MODULE_LICENSE("GPL");
429