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1/*
2 * OHCI HCD (Host Controller Driver) for USB.
3 *
4 * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
5 * (C) Copyright 2000-2005 David Brownell
6 * (C) Copyright 2002 Hewlett-Packard Company
7 *
8 * OMAP Bus Glue
9 *
10 * Modified for OMAP by Tony Lindgren <tony@atomide.com>
11 * Based on the 2.4 OMAP OHCI driver originally done by MontaVista Software Inc.
12 * and on ohci-sa1111.c by Christopher Hoover <ch@hpl.hp.com>
13 *
14 * This file is licenced under the GPL.
15 */
16
17#include <linux/clk.h>
18#include <linux/dma-mapping.h>
19#include <linux/err.h>
20#include <linux/gpio.h>
21#include <linux/io.h>
22#include <linux/jiffies.h>
23#include <linux/kernel.h>
24#include <linux/module.h>
25#include <linux/usb/otg.h>
26#include <linux/platform_device.h>
27#include <linux/signal.h>
28#include <linux/usb.h>
29#include <linux/usb/hcd.h>
30
31#include "ohci.h"
32
33#include <asm/io.h>
34#include <asm/mach-types.h>
35
36#include <mach/mux.h>
37
38#include <mach/hardware.h>
39#include <mach/irqs.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/i2c/tps65010.h>
58#else
59
60#define LOW	0
61#define HIGH	1
62
63#define GPIO1	1
64
65static inline int tps65010_set_gpio_out_value(unsigned gpio, unsigned value)
66{
67	return 0;
68}
69
70#endif
71
72extern int usb_disabled(void);
73extern int ocpi_enable(void);
74
75static struct clk *usb_host_ck;
76static struct clk *usb_dc_ck;
77
78static const char hcd_name[] = "ohci-omap";
79static struct hc_driver __read_mostly ohci_omap_hc_driver;
80
81static void omap_ohci_clock_power(int on)
82{
83	if (on) {
84		clk_enable(usb_dc_ck);
85		clk_enable(usb_host_ck);
86		/* guesstimate for T5 == 1x 32K clock + APLL lock time */
87		udelay(100);
88	} else {
89		clk_disable(usb_host_ck);
90		clk_disable(usb_dc_ck);
91	}
92}
93
94/*
95 * Board specific gang-switched transceiver power on/off.
96 * NOTE:  OSK supplies power from DC, not battery.
97 */
98static int omap_ohci_transceiver_power(int on)
99{
100	if (on) {
101		if (machine_is_omap_innovator() && cpu_is_omap1510())
102			__raw_writeb(__raw_readb(INNOVATOR_FPGA_CAM_USB_CONTROL)
103				| ((1 << 5/*usb1*/) | (1 << 3/*usb2*/)),
104			       INNOVATOR_FPGA_CAM_USB_CONTROL);
105		else if (machine_is_omap_osk())
106			tps65010_set_gpio_out_value(GPIO1, LOW);
107	} else {
108		if (machine_is_omap_innovator() && cpu_is_omap1510())
109			__raw_writeb(__raw_readb(INNOVATOR_FPGA_CAM_USB_CONTROL)
110				& ~((1 << 5/*usb1*/) | (1 << 3/*usb2*/)),
111			       INNOVATOR_FPGA_CAM_USB_CONTROL);
112		else if (machine_is_omap_osk())
113			tps65010_set_gpio_out_value(GPIO1, HIGH);
114	}
115
116	return 0;
117}
118
119#ifdef CONFIG_ARCH_OMAP15XX
120/*
121 * OMAP-1510 specific Local Bus clock on/off
122 */
123static int omap_1510_local_bus_power(int on)
124{
125	if (on) {
126		omap_writel((1 << 1) | (1 << 0), OMAP1510_LB_MMU_CTL);
127		udelay(200);
128	} else {
129		omap_writel(0, OMAP1510_LB_MMU_CTL);
130	}
131
132	return 0;
133}
134
135/*
136 * OMAP-1510 specific Local Bus initialization
137 * NOTE: This assumes 32MB memory size in OMAP1510LB_MEMSIZE.
138 *       See also arch/mach-omap/memory.h for __virt_to_dma() and
139 *       __dma_to_virt() which need to match with the physical
140 *       Local Bus address below.
141 */
142static int omap_1510_local_bus_init(void)
143{
144	unsigned int tlb;
145	unsigned long lbaddr, physaddr;
146
147	omap_writel((omap_readl(OMAP1510_LB_CLOCK_DIV) & 0xfffffff8) | 0x4,
148	       OMAP1510_LB_CLOCK_DIV);
149
150	/* Configure the Local Bus MMU table */
151	for (tlb = 0; tlb < OMAP1510_LB_MEMSIZE; tlb++) {
152		lbaddr = tlb * 0x00100000 + OMAP1510_LB_OFFSET;
153		physaddr = tlb * 0x00100000 + PHYS_OFFSET;
154		omap_writel((lbaddr & 0x0fffffff) >> 22, OMAP1510_LB_MMU_CAM_H);
155		omap_writel(((lbaddr & 0x003ffc00) >> 6) | 0xc,
156		       OMAP1510_LB_MMU_CAM_L);
157		omap_writel(physaddr >> 16, OMAP1510_LB_MMU_RAM_H);
158		omap_writel((physaddr & 0x0000fc00) | 0x300, OMAP1510_LB_MMU_RAM_L);
159		omap_writel(tlb << 4, OMAP1510_LB_MMU_LCK);
160		omap_writel(0x1, OMAP1510_LB_MMU_LD_TLB);
161	}
162
163	/* Enable the walking table */
164	omap_writel(omap_readl(OMAP1510_LB_MMU_CTL) | (1 << 3), OMAP1510_LB_MMU_CTL);
165	udelay(200);
166
167	return 0;
168}
169#else
170#define omap_1510_local_bus_power(x)	{}
171#define omap_1510_local_bus_init()	{}
172#endif
173
174#ifdef	CONFIG_USB_OTG
175
176static void start_hnp(struct ohci_hcd *ohci)
177{
178	struct usb_hcd *hcd = ohci_to_hcd(ohci);
179	const unsigned	port = hcd->self.otg_port - 1;
180	unsigned long	flags;
181	u32 l;
182
183	otg_start_hnp(hcd->usb_phy->otg);
184
185	local_irq_save(flags);
186	hcd->usb_phy->state = OTG_STATE_A_SUSPEND;
187	writel (RH_PS_PSS, &ohci->regs->roothub.portstatus [port]);
188	l = omap_readl(OTG_CTRL);
189	l &= ~OTG_A_BUSREQ;
190	omap_writel(l, OTG_CTRL);
191	local_irq_restore(flags);
192}
193
194#endif
195
196/*-------------------------------------------------------------------------*/
197
198static int ohci_omap_reset(struct usb_hcd *hcd)
199{
200	struct ohci_hcd		*ohci = hcd_to_ohci(hcd);
201	struct omap_usb_config	*config = dev_get_platdata(hcd->self.controller);
202	int			need_transceiver = (config->otg != 0);
203	int			ret;
204
205	dev_dbg(hcd->self.controller, "starting USB Controller\n");
206
207	if (config->otg) {
208		hcd->self.otg_port = config->otg;
209		/* default/minimum OTG power budget:  8 mA */
210		hcd->power_budget = 8;
211	}
212
213	/* boards can use OTG transceivers in non-OTG modes */
214	need_transceiver = need_transceiver
215			|| machine_is_omap_h2() || machine_is_omap_h3();
216
217	/* XXX OMAP16xx only */
218	if (config->ocpi_enable)
219		config->ocpi_enable();
220
221#ifdef	CONFIG_USB_OTG
222	if (need_transceiver) {
223		hcd->usb_phy = usb_get_phy(USB_PHY_TYPE_USB2);
224		if (!IS_ERR_OR_NULL(hcd->usb_phy)) {
225			int	status = otg_set_host(hcd->usb_phy->otg,
226						&ohci_to_hcd(ohci)->self);
227			dev_dbg(hcd->self.controller, "init %s phy, status %d\n",
228					hcd->usb_phy->label, status);
229			if (status) {
230				usb_put_phy(hcd->usb_phy);
231				return status;
232			}
233		} else {
234			dev_err(hcd->self.controller, "can't find phy\n");
235			return -ENODEV;
236		}
237		ohci->start_hnp = start_hnp;
238	}
239#endif
240
241	omap_ohci_clock_power(1);
242
243	if (cpu_is_omap15xx()) {
244		omap_1510_local_bus_power(1);
245		omap_1510_local_bus_init();
246	}
247
248	ret = ohci_setup(hcd);
249	if (ret < 0)
250		return ret;
251
252	if (config->otg || config->rwc) {
253		ohci->hc_control = OHCI_CTRL_RWC;
254		writel(OHCI_CTRL_RWC, &ohci->regs->control);
255	}
256
257	/* board-specific power switching and overcurrent support */
258	if (machine_is_omap_osk() || machine_is_omap_innovator()) {
259		u32	rh = roothub_a (ohci);
260
261		/* power switching (ganged by default) */
262		rh &= ~RH_A_NPS;
263
264		/* TPS2045 switch for internal transceiver (port 1) */
265		if (machine_is_omap_osk()) {
266			ohci_to_hcd(ohci)->power_budget = 250;
267
268			rh &= ~RH_A_NOCP;
269
270			/* gpio9 for overcurrent detction */
271			omap_cfg_reg(W8_1610_GPIO9);
272			gpio_request(9, "OHCI overcurrent");
273			gpio_direction_input(9);
274
275			/* for paranoia's sake:  disable USB.PUEN */
276			omap_cfg_reg(W4_USB_HIGHZ);
277		}
278		ohci_writel(ohci, rh, &ohci->regs->roothub.a);
279		ohci->flags &= ~OHCI_QUIRK_HUB_POWER;
280	} else if (machine_is_nokia770()) {
281		/* We require a self-powered hub, which should have
282		 * plenty of power. */
283		ohci_to_hcd(ohci)->power_budget = 0;
284	}
285
286	/* FIXME hub_wq hub requests should manage power switching */
287	omap_ohci_transceiver_power(1);
288
289	/* board init will have already handled HMC and mux setup.
290	 * any external transceiver should already be initialized
291	 * too, so all configured ports use the right signaling now.
292	 */
293
294	return 0;
295}
296
297/*-------------------------------------------------------------------------*/
298
299/**
300 * usb_hcd_omap_probe - initialize OMAP-based HCDs
301 * Context: !in_interrupt()
302 *
303 * Allocates basic resources for this USB host controller, and
304 * then invokes the start() method for the HCD associated with it
305 * through the hotplug entry's driver_data.
306 */
307static int usb_hcd_omap_probe (const struct hc_driver *driver,
308			  struct platform_device *pdev)
309{
310	int retval, irq;
311	struct usb_hcd *hcd = 0;
312
313	if (pdev->num_resources != 2) {
314		dev_err(&pdev->dev, "invalid num_resources: %i\n",
315		       pdev->num_resources);
316		return -ENODEV;
317	}
318
319	if (pdev->resource[0].flags != IORESOURCE_MEM
320			|| pdev->resource[1].flags != IORESOURCE_IRQ) {
321		dev_err(&pdev->dev, "invalid resource type\n");
322		return -ENODEV;
323	}
324
325	usb_host_ck = clk_get(&pdev->dev, "usb_hhc_ck");
326	if (IS_ERR(usb_host_ck))
327		return PTR_ERR(usb_host_ck);
328
329	if (!cpu_is_omap15xx())
330		usb_dc_ck = clk_get(&pdev->dev, "usb_dc_ck");
331	else
332		usb_dc_ck = clk_get(&pdev->dev, "lb_ck");
333
334	if (IS_ERR(usb_dc_ck)) {
335		clk_put(usb_host_ck);
336		return PTR_ERR(usb_dc_ck);
337	}
338
339
340	hcd = usb_create_hcd (driver, &pdev->dev, dev_name(&pdev->dev));
341	if (!hcd) {
342		retval = -ENOMEM;
343		goto err0;
344	}
345	hcd->rsrc_start = pdev->resource[0].start;
346	hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1;
347
348	if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
349		dev_dbg(&pdev->dev, "request_mem_region failed\n");
350		retval = -EBUSY;
351		goto err1;
352	}
353
354	hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
355	if (!hcd->regs) {
356		dev_err(&pdev->dev, "can't ioremap OHCI HCD\n");
357		retval = -ENOMEM;
358		goto err2;
359	}
360
361	irq = platform_get_irq(pdev, 0);
362	if (irq < 0) {
363		retval = -ENXIO;
364		goto err3;
365	}
366	retval = usb_add_hcd(hcd, irq, 0);
367	if (retval)
368		goto err3;
369
370	device_wakeup_enable(hcd->self.controller);
371	return 0;
372err3:
373	iounmap(hcd->regs);
374err2:
375	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
376err1:
377	usb_put_hcd(hcd);
378err0:
379	clk_put(usb_dc_ck);
380	clk_put(usb_host_ck);
381	return retval;
382}
383
384
385/* may be called with controller, bus, and devices active */
386
387/**
388 * usb_hcd_omap_remove - shutdown processing for OMAP-based HCDs
389 * @dev: USB Host Controller being removed
390 * Context: !in_interrupt()
391 *
392 * Reverses the effect of usb_hcd_omap_probe(), first invoking
393 * the HCD's stop() method.  It is always called from a thread
394 * context, normally "rmmod", "apmd", or something similar.
395 */
396static inline void
397usb_hcd_omap_remove (struct usb_hcd *hcd, struct platform_device *pdev)
398{
399	dev_dbg(hcd->self.controller, "stopping USB Controller\n");
400	usb_remove_hcd(hcd);
401	omap_ohci_clock_power(0);
402	if (!IS_ERR_OR_NULL(hcd->usb_phy)) {
403		(void) otg_set_host(hcd->usb_phy->otg, 0);
404		usb_put_phy(hcd->usb_phy);
405	}
406	if (machine_is_omap_osk())
407		gpio_free(9);
408	iounmap(hcd->regs);
409	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
410	usb_put_hcd(hcd);
411	clk_put(usb_dc_ck);
412	clk_put(usb_host_ck);
413}
414
415/*-------------------------------------------------------------------------*/
416
417static int ohci_hcd_omap_drv_probe(struct platform_device *dev)
418{
419	return usb_hcd_omap_probe(&ohci_omap_hc_driver, dev);
420}
421
422static int ohci_hcd_omap_drv_remove(struct platform_device *dev)
423{
424	struct usb_hcd		*hcd = platform_get_drvdata(dev);
425
426	usb_hcd_omap_remove(hcd, dev);
427
428	return 0;
429}
430
431/*-------------------------------------------------------------------------*/
432
433#ifdef	CONFIG_PM
434
435static int ohci_omap_suspend(struct platform_device *pdev, pm_message_t message)
436{
437	struct usb_hcd *hcd = platform_get_drvdata(pdev);
438	struct ohci_hcd *ohci = hcd_to_ohci(hcd);
439	bool do_wakeup = device_may_wakeup(&pdev->dev);
440	int ret;
441
442	if (time_before(jiffies, ohci->next_statechange))
443		msleep(5);
444	ohci->next_statechange = jiffies;
445
446	ret = ohci_suspend(hcd, do_wakeup);
447	if (ret)
448		return ret;
449
450	omap_ohci_clock_power(0);
451	return ret;
452}
453
454static int ohci_omap_resume(struct platform_device *dev)
455{
456	struct usb_hcd	*hcd = platform_get_drvdata(dev);
457	struct ohci_hcd	*ohci = hcd_to_ohci(hcd);
458
459	if (time_before(jiffies, ohci->next_statechange))
460		msleep(5);
461	ohci->next_statechange = jiffies;
462
463	omap_ohci_clock_power(1);
464	ohci_resume(hcd, false);
465	return 0;
466}
467
468#endif
469
470/*-------------------------------------------------------------------------*/
471
472/*
473 * Driver definition to register with the OMAP bus
474 */
475static struct platform_driver ohci_hcd_omap_driver = {
476	.probe		= ohci_hcd_omap_drv_probe,
477	.remove		= ohci_hcd_omap_drv_remove,
478	.shutdown	= usb_hcd_platform_shutdown,
479#ifdef	CONFIG_PM
480	.suspend	= ohci_omap_suspend,
481	.resume		= ohci_omap_resume,
482#endif
483	.driver		= {
484		.owner	= THIS_MODULE,
485		.name	= "ohci",
486	},
487};
488
489static const struct ohci_driver_overrides omap_overrides __initconst = {
490	.product_desc	= "OMAP OHCI",
491	.reset		= ohci_omap_reset
492};
493
494static int __init ohci_omap_init(void)
495{
496	if (usb_disabled())
497		return -ENODEV;
498
499	pr_info("%s: " DRIVER_DESC "\n", hcd_name);
500
501	ohci_init_driver(&ohci_omap_hc_driver, &omap_overrides);
502	return platform_driver_register(&ohci_hcd_omap_driver);
503}
504module_init(ohci_omap_init);
505
506static void __exit ohci_omap_cleanup(void)
507{
508	platform_driver_unregister(&ohci_hcd_omap_driver);
509}
510module_exit(ohci_omap_cleanup);
511
512MODULE_DESCRIPTION(DRIVER_DESC);
513MODULE_ALIAS("platform:ohci");
514MODULE_LICENSE("GPL");
515