xref: /openbmc/linux/drivers/usb/host/ohci-omap.c (revision 757cc3e9) 
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.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/signal.h>
29 #include <linux/usb.h>
30 #include <linux/usb/hcd.h>
31 
32 #include "ohci.h"
33 
34 #include <asm/io.h>
35 #include <asm/mach-types.h>
36 
37 #include <mach/mux.h>
38 
39 #include <mach/hardware.h>
40 #include <mach/usb.h>
41 
42 
43 /* OMAP-1510 OHCI has its own MMU for DMA */
44 #define OMAP1510_LB_MEMSIZE	32	/* Should be same as SDRAM size */
45 #define OMAP1510_LB_CLOCK_DIV	0xfffec10c
46 #define OMAP1510_LB_MMU_CTL	0xfffec208
47 #define OMAP1510_LB_MMU_LCK	0xfffec224
48 #define OMAP1510_LB_MMU_LD_TLB	0xfffec228
49 #define OMAP1510_LB_MMU_CAM_H	0xfffec22c
50 #define OMAP1510_LB_MMU_CAM_L	0xfffec230
51 #define OMAP1510_LB_MMU_RAM_H	0xfffec234
52 #define OMAP1510_LB_MMU_RAM_L	0xfffec238
53 
54 #define DRIVER_DESC "OHCI OMAP driver"
55 
56 #ifdef CONFIG_TPS65010
57 #include <linux/mfd/tps65010.h>
58 #else
59 
60 #define LOW	0
61 #define HIGH	1
62 
63 #define GPIO1	1
64 
65 static inline int tps65010_set_gpio_out_value(unsigned gpio, unsigned value)
66 {
67 	return 0;
68 }
69 
70 #endif
71 
72 static struct clk *usb_host_ck;
73 static struct clk *usb_dc_ck;
74 
75 static const char hcd_name[] = "ohci-omap";
76 static struct hc_driver __read_mostly ohci_omap_hc_driver;
77 
78 static void omap_ohci_clock_power(int on)
79 {
80 	if (on) {
81 		clk_enable(usb_dc_ck);
82 		clk_enable(usb_host_ck);
83 		/* guesstimate for T5 == 1x 32K clock + APLL lock time */
84 		udelay(100);
85 	} else {
86 		clk_disable(usb_host_ck);
87 		clk_disable(usb_dc_ck);
88 	}
89 }
90 
91 /*
92  * Board specific gang-switched transceiver power on/off.
93  * NOTE:  OSK supplies power from DC, not battery.
94  */
95 static int omap_ohci_transceiver_power(int on)
96 {
97 	if (on) {
98 		if (machine_is_omap_innovator() && cpu_is_omap1510())
99 			__raw_writeb(__raw_readb(INNOVATOR_FPGA_CAM_USB_CONTROL)
100 				| ((1 << 5/*usb1*/) | (1 << 3/*usb2*/)),
101 			       INNOVATOR_FPGA_CAM_USB_CONTROL);
102 		else if (machine_is_omap_osk())
103 			tps65010_set_gpio_out_value(GPIO1, LOW);
104 	} else {
105 		if (machine_is_omap_innovator() && cpu_is_omap1510())
106 			__raw_writeb(__raw_readb(INNOVATOR_FPGA_CAM_USB_CONTROL)
107 				& ~((1 << 5/*usb1*/) | (1 << 3/*usb2*/)),
108 			       INNOVATOR_FPGA_CAM_USB_CONTROL);
109 		else if (machine_is_omap_osk())
110 			tps65010_set_gpio_out_value(GPIO1, HIGH);
111 	}
112 
113 	return 0;
114 }
115 
116 #ifdef CONFIG_ARCH_OMAP15XX
117 /*
118  * OMAP-1510 specific Local Bus clock on/off
119  */
120 static int omap_1510_local_bus_power(int on)
121 {
122 	if (on) {
123 		omap_writel((1 << 1) | (1 << 0), OMAP1510_LB_MMU_CTL);
124 		udelay(200);
125 	} else {
126 		omap_writel(0, OMAP1510_LB_MMU_CTL);
127 	}
128 
129 	return 0;
130 }
131 
132 /*
133  * OMAP-1510 specific Local Bus initialization
134  * NOTE: This assumes 32MB memory size in OMAP1510LB_MEMSIZE.
135  *       See also arch/mach-omap/memory.h for __virt_to_dma() and
136  *       __dma_to_virt() which need to match with the physical
137  *       Local Bus address below.
138  */
139 static int omap_1510_local_bus_init(void)
140 {
141 	unsigned int tlb;
142 	unsigned long lbaddr, physaddr;
143 
144 	omap_writel((omap_readl(OMAP1510_LB_CLOCK_DIV) & 0xfffffff8) | 0x4,
145 	       OMAP1510_LB_CLOCK_DIV);
146 
147 	/* Configure the Local Bus MMU table */
148 	for (tlb = 0; tlb < OMAP1510_LB_MEMSIZE; tlb++) {
149 		lbaddr = tlb * 0x00100000 + OMAP1510_LB_OFFSET;
150 		physaddr = tlb * 0x00100000 + PHYS_OFFSET;
151 		omap_writel((lbaddr & 0x0fffffff) >> 22, OMAP1510_LB_MMU_CAM_H);
152 		omap_writel(((lbaddr & 0x003ffc00) >> 6) | 0xc,
153 		       OMAP1510_LB_MMU_CAM_L);
154 		omap_writel(physaddr >> 16, OMAP1510_LB_MMU_RAM_H);
155 		omap_writel((physaddr & 0x0000fc00) | 0x300, OMAP1510_LB_MMU_RAM_L);
156 		omap_writel(tlb << 4, OMAP1510_LB_MMU_LCK);
157 		omap_writel(0x1, OMAP1510_LB_MMU_LD_TLB);
158 	}
159 
160 	/* Enable the walking table */
161 	omap_writel(omap_readl(OMAP1510_LB_MMU_CTL) | (1 << 3), OMAP1510_LB_MMU_CTL);
162 	udelay(200);
163 
164 	return 0;
165 }
166 #else
167 #define omap_1510_local_bus_power(x)	{}
168 #define omap_1510_local_bus_init()	{}
169 #endif
170 
171 #ifdef	CONFIG_USB_OTG
172 
173 static void start_hnp(struct ohci_hcd *ohci)
174 {
175 	struct usb_hcd *hcd = ohci_to_hcd(ohci);
176 	const unsigned	port = hcd->self.otg_port - 1;
177 	unsigned long	flags;
178 	u32 l;
179 
180 	otg_start_hnp(hcd->usb_phy->otg);
181 
182 	local_irq_save(flags);
183 	hcd->usb_phy->otg->state = OTG_STATE_A_SUSPEND;
184 	writel (RH_PS_PSS, &ohci->regs->roothub.portstatus [port]);
185 	l = omap_readl(OTG_CTRL);
186 	l &= ~OTG_A_BUSREQ;
187 	omap_writel(l, OTG_CTRL);
188 	local_irq_restore(flags);
189 }
190 
191 #endif
192 
193 /*-------------------------------------------------------------------------*/
194 
195 static int ohci_omap_reset(struct usb_hcd *hcd)
196 {
197 	struct ohci_hcd		*ohci = hcd_to_ohci(hcd);
198 	struct omap_usb_config	*config = dev_get_platdata(hcd->self.controller);
199 	int			need_transceiver = (config->otg != 0);
200 	int			ret;
201 
202 	dev_dbg(hcd->self.controller, "starting USB Controller\n");
203 
204 	if (config->otg) {
205 		hcd->self.otg_port = config->otg;
206 		/* default/minimum OTG power budget:  8 mA */
207 		hcd->power_budget = 8;
208 	}
209 
210 	/* boards can use OTG transceivers in non-OTG modes */
211 	need_transceiver = need_transceiver
212 			|| machine_is_omap_h2() || machine_is_omap_h3();
213 
214 	/* XXX OMAP16xx only */
215 	if (config->ocpi_enable)
216 		config->ocpi_enable();
217 
218 #ifdef	CONFIG_USB_OTG
219 	if (need_transceiver) {
220 		hcd->usb_phy = usb_get_phy(USB_PHY_TYPE_USB2);
221 		if (!IS_ERR_OR_NULL(hcd->usb_phy)) {
222 			int	status = otg_set_host(hcd->usb_phy->otg,
223 						&ohci_to_hcd(ohci)->self);
224 			dev_dbg(hcd->self.controller, "init %s phy, status %d\n",
225 					hcd->usb_phy->label, status);
226 			if (status) {
227 				usb_put_phy(hcd->usb_phy);
228 				return status;
229 			}
230 		} else {
231 			return -EPROBE_DEFER;
232 		}
233 		hcd->skip_phy_initialization = 1;
234 		ohci->start_hnp = start_hnp;
235 	}
236 #endif
237 
238 	omap_ohci_clock_power(1);
239 
240 	if (cpu_is_omap15xx()) {
241 		omap_1510_local_bus_power(1);
242 		omap_1510_local_bus_init();
243 	}
244 
245 	ret = ohci_setup(hcd);
246 	if (ret < 0)
247 		return ret;
248 
249 	if (config->otg || config->rwc) {
250 		ohci->hc_control = OHCI_CTRL_RWC;
251 		writel(OHCI_CTRL_RWC, &ohci->regs->control);
252 	}
253 
254 	/* board-specific power switching and overcurrent support */
255 	if (machine_is_omap_osk() || machine_is_omap_innovator()) {
256 		u32	rh = roothub_a (ohci);
257 
258 		/* power switching (ganged by default) */
259 		rh &= ~RH_A_NPS;
260 
261 		/* TPS2045 switch for internal transceiver (port 1) */
262 		if (machine_is_omap_osk()) {
263 			ohci_to_hcd(ohci)->power_budget = 250;
264 
265 			rh &= ~RH_A_NOCP;
266 
267 			/* gpio9 for overcurrent detction */
268 			omap_cfg_reg(W8_1610_GPIO9);
269 			gpio_request(9, "OHCI overcurrent");
270 			gpio_direction_input(9);
271 
272 			/* for paranoia's sake:  disable USB.PUEN */
273 			omap_cfg_reg(W4_USB_HIGHZ);
274 		}
275 		ohci_writel(ohci, rh, &ohci->regs->roothub.a);
276 		ohci->flags &= ~OHCI_QUIRK_HUB_POWER;
277 	} else if (machine_is_nokia770()) {
278 		/* We require a self-powered hub, which should have
279 		 * plenty of power. */
280 		ohci_to_hcd(ohci)->power_budget = 0;
281 	}
282 
283 	/* FIXME hub_wq hub requests should manage power switching */
284 	omap_ohci_transceiver_power(1);
285 
286 	/* board init will have already handled HMC and mux setup.
287 	 * any external transceiver should already be initialized
288 	 * too, so all configured ports use the right signaling now.
289 	 */
290 
291 	return 0;
292 }
293 
294 /*-------------------------------------------------------------------------*/
295 
296 /**
297  * ohci_hcd_omap_probe - initialize OMAP-based HCDs
298  * Context: !in_interrupt()
299  *
300  * Allocates basic resources for this USB host controller, and
301  * then invokes the start() method for the HCD associated with it
302  * through the hotplug entry's driver_data.
303  */
304 static int ohci_hcd_omap_probe(struct platform_device *pdev)
305 {
306 	int retval, irq;
307 	struct usb_hcd *hcd = 0;
308 
309 	if (pdev->num_resources != 2) {
310 		dev_err(&pdev->dev, "invalid num_resources: %i\n",
311 		       pdev->num_resources);
312 		return -ENODEV;
313 	}
314 
315 	if (pdev->resource[0].flags != IORESOURCE_MEM
316 			|| pdev->resource[1].flags != IORESOURCE_IRQ) {
317 		dev_err(&pdev->dev, "invalid resource type\n");
318 		return -ENODEV;
319 	}
320 
321 	usb_host_ck = clk_get(&pdev->dev, "usb_hhc_ck");
322 	if (IS_ERR(usb_host_ck))
323 		return PTR_ERR(usb_host_ck);
324 
325 	if (!cpu_is_omap15xx())
326 		usb_dc_ck = clk_get(&pdev->dev, "usb_dc_ck");
327 	else
328 		usb_dc_ck = clk_get(&pdev->dev, "lb_ck");
329 
330 	if (IS_ERR(usb_dc_ck)) {
331 		clk_put(usb_host_ck);
332 		return PTR_ERR(usb_dc_ck);
333 	}
334 
335 
336 	hcd = usb_create_hcd(&ohci_omap_hc_driver, &pdev->dev,
337 			dev_name(&pdev->dev));
338 	if (!hcd) {
339 		retval = -ENOMEM;
340 		goto err0;
341 	}
342 	hcd->rsrc_start = pdev->resource[0].start;
343 	hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1;
344 
345 	if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
346 		dev_dbg(&pdev->dev, "request_mem_region failed\n");
347 		retval = -EBUSY;
348 		goto err1;
349 	}
350 
351 	hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
352 	if (!hcd->regs) {
353 		dev_err(&pdev->dev, "can't ioremap OHCI HCD\n");
354 		retval = -ENOMEM;
355 		goto err2;
356 	}
357 
358 	irq = platform_get_irq(pdev, 0);
359 	if (irq < 0) {
360 		retval = -ENXIO;
361 		goto err3;
362 	}
363 	retval = usb_add_hcd(hcd, irq, 0);
364 	if (retval)
365 		goto err3;
366 
367 	device_wakeup_enable(hcd->self.controller);
368 	return 0;
369 err3:
370 	iounmap(hcd->regs);
371 err2:
372 	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
373 err1:
374 	usb_put_hcd(hcd);
375 err0:
376 	clk_put(usb_dc_ck);
377 	clk_put(usb_host_ck);
378 	return retval;
379 }
380 
381 
382 /* may be called with controller, bus, and devices active */
383 
384 /**
385  * ohci_hcd_omap_remove - shutdown processing for OMAP-based HCDs
386  * @dev: USB Host Controller being removed
387  * Context: !in_interrupt()
388  *
389  * Reverses the effect of ohci_hcd_omap_probe(), first invoking
390  * the HCD's stop() method.  It is always called from a thread
391  * context, normally "rmmod", "apmd", or something similar.
392  */
393 static int ohci_hcd_omap_remove(struct platform_device *pdev)
394 {
395 	struct usb_hcd	*hcd = platform_get_drvdata(pdev);
396 
397 	dev_dbg(hcd->self.controller, "stopping USB Controller\n");
398 	usb_remove_hcd(hcd);
399 	omap_ohci_clock_power(0);
400 	if (!IS_ERR_OR_NULL(hcd->usb_phy)) {
401 		(void) otg_set_host(hcd->usb_phy->otg, 0);
402 		usb_put_phy(hcd->usb_phy);
403 	}
404 	if (machine_is_omap_osk())
405 		gpio_free(9);
406 	iounmap(hcd->regs);
407 	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
408 	usb_put_hcd(hcd);
409 	clk_put(usb_dc_ck);
410 	clk_put(usb_host_ck);
411 	return 0;
412 }
413 
414 /*-------------------------------------------------------------------------*/
415 
416 #ifdef	CONFIG_PM
417 
418 static int ohci_omap_suspend(struct platform_device *pdev, pm_message_t message)
419 {
420 	struct usb_hcd *hcd = platform_get_drvdata(pdev);
421 	struct ohci_hcd *ohci = hcd_to_ohci(hcd);
422 	bool do_wakeup = device_may_wakeup(&pdev->dev);
423 	int ret;
424 
425 	if (time_before(jiffies, ohci->next_statechange))
426 		msleep(5);
427 	ohci->next_statechange = jiffies;
428 
429 	ret = ohci_suspend(hcd, do_wakeup);
430 	if (ret)
431 		return ret;
432 
433 	omap_ohci_clock_power(0);
434 	return ret;
435 }
436 
437 static int ohci_omap_resume(struct platform_device *dev)
438 {
439 	struct usb_hcd	*hcd = platform_get_drvdata(dev);
440 	struct ohci_hcd	*ohci = hcd_to_ohci(hcd);
441 
442 	if (time_before(jiffies, ohci->next_statechange))
443 		msleep(5);
444 	ohci->next_statechange = jiffies;
445 
446 	omap_ohci_clock_power(1);
447 	ohci_resume(hcd, false);
448 	return 0;
449 }
450 
451 #endif
452 
453 /*-------------------------------------------------------------------------*/
454 
455 /*
456  * Driver definition to register with the OMAP bus
457  */
458 static struct platform_driver ohci_hcd_omap_driver = {
459 	.probe		= ohci_hcd_omap_probe,
460 	.remove		= ohci_hcd_omap_remove,
461 	.shutdown	= usb_hcd_platform_shutdown,
462 #ifdef	CONFIG_PM
463 	.suspend	= ohci_omap_suspend,
464 	.resume		= ohci_omap_resume,
465 #endif
466 	.driver		= {
467 		.name	= "ohci",
468 	},
469 };
470 
471 static const struct ohci_driver_overrides omap_overrides __initconst = {
472 	.product_desc	= "OMAP OHCI",
473 	.reset		= ohci_omap_reset
474 };
475 
476 static int __init ohci_omap_init(void)
477 {
478 	if (usb_disabled())
479 		return -ENODEV;
480 
481 	pr_info("%s: " DRIVER_DESC "\n", hcd_name);
482 
483 	ohci_init_driver(&ohci_omap_hc_driver, &omap_overrides);
484 	return platform_driver_register(&ohci_hcd_omap_driver);
485 }
486 module_init(ohci_omap_init);
487 
488 static void __exit ohci_omap_cleanup(void)
489 {
490 	platform_driver_unregister(&ohci_hcd_omap_driver);
491 }
492 module_exit(ohci_omap_cleanup);
493 
494 MODULE_DESCRIPTION(DRIVER_DESC);
495 MODULE_ALIAS("platform:ohci");
496 MODULE_LICENSE("GPL");
497