[deliverable/linux.git] / drivers / usb / host / ehci-pci.c

/*
 * EHCI HCD (Host Controller Driver) PCI Bus Glue.
 *
 * Copyright (c) 2000-2004 by David Brownell
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#ifndef CONFIG_PCI
#error "This file is PCI bus glue.  CONFIG_PCI must be defined."
#endif

/*-------------------------------------------------------------------------*/

/* EHCI 0.96 (and later) section 5.1 says how to kick BIOS/SMM/...
 * off the controller (maybe it can boot from highspeed USB disks).
 */
static int bios_handoff(struct ehci_hcd *ehci, int where, u32 cap)
{
	struct pci_dev *pdev = to_pci_dev(ehci_to_hcd(ehci)->self.controller);

	/* always say Linux will own the hardware */
	pci_write_config_byte(pdev, where + 3, 1);

	/* maybe wait a while for BIOS to respond */
	if (cap & (1 << 16)) {
		int msec = 5000;

		do {
			msleep(10);
			msec -= 10;
			pci_read_config_dword(pdev, where, &cap);
		} while ((cap & (1 << 16)) && msec);
		if (cap & (1 << 16)) {
			ehci_err(ehci, "BIOS handoff failed (%d, %08x)\n",
				where, cap);
			// some BIOS versions seem buggy...
			// return 1;
			ehci_warn(ehci, "continuing after BIOS bug...\n");
			/* disable all SMIs, and clear "BIOS owns" flag */
			pci_write_config_dword(pdev, where + 4, 0);
			pci_write_config_byte(pdev, where + 2, 0);
		} else
			ehci_dbg(ehci, "BIOS handoff succeeded\n");
	}
	return 0;
}

/* called after powerup, by probe or system-pm "wakeup" */
static int ehci_pci_reinit(struct ehci_hcd *ehci, struct pci_dev *pdev)
{
	u32			temp;
	int			retval;
	unsigned		count = 256/4;

	/* optional debug port, normally in the first BAR */
	temp = pci_find_capability(pdev, 0x0a);
	if (temp) {
		pci_read_config_dword(pdev, temp, &temp);
		temp >>= 16;
		if ((temp & (3 << 13)) == (1 << 13)) {
			temp &= 0x1fff;
			ehci->debug = ehci_to_hcd(ehci)->regs + temp;
			temp = readl(&ehci->debug->control);
			ehci_info(ehci, "debug port %d%s\n",
				HCS_DEBUG_PORT(ehci->hcs_params),
				(temp & DBGP_ENABLED)
					? " IN USE"
					: "");
			if (!(temp & DBGP_ENABLED))
				ehci->debug = NULL;
		}
	}

	temp = HCC_EXT_CAPS(readl(&ehci->caps->hcc_params));

	/* EHCI 0.96 and later may have "extended capabilities" */
	while (temp && count--) {
		u32		cap;

		pci_read_config_dword(pdev, temp, &cap);
		ehci_dbg(ehci, "capability %04x at %02x\n", cap, temp);
		switch (cap & 0xff) {
		case 1:			/* BIOS/SMM/... handoff */
			if (bios_handoff(ehci, temp, cap) != 0)
				return -EOPNOTSUPP;
			break;
		case 0:			/* illegal reserved capability */
			ehci_dbg(ehci, "illegal capability!\n");
			cap = 0;
			/* FALLTHROUGH */
		default:		/* unknown */
			break;
		}
		temp = (cap >> 8) & 0xff;
	}
	if (!count) {
		ehci_err(ehci, "bogus capabilities ... PCI problems!\n");
		return -EIO;
	}

	/* PCI Memory-Write-Invalidate cycle support is optional (uncommon) */
	retval = pci_set_mwi(pdev);
	if (!retval)
		ehci_dbg(ehci, "MWI active\n");

	ehci_port_power(ehci, 0);

	return 0;
}

/* called by khubd or root hub (re)init threads; leaves HC in halt state */
static int ehci_pci_reset(struct usb_hcd *hcd)
{
	struct ehci_hcd		*ehci = hcd_to_ehci(hcd);
	struct pci_dev		*pdev = to_pci_dev(hcd->self.controller);
	u32			temp;
	int			retval;

	ehci->caps = hcd->regs;
	ehci->regs = hcd->regs + HC_LENGTH(readl(&ehci->caps->hc_capbase));
	dbg_hcs_params(ehci, "reset");
	dbg_hcc_params(ehci, "reset");

	/* cache this readonly data; minimize chip reads */
	ehci->hcs_params = readl(&ehci->caps->hcs_params);

	retval = ehci_halt(ehci);
	if (retval)
		return retval;

	/* NOTE:  only the parts below this line are PCI-specific */

	switch (pdev->vendor) {
	case PCI_VENDOR_ID_TDI:
		if (pdev->device == PCI_DEVICE_ID_TDI_EHCI) {
			ehci->is_tdi_rh_tt = 1;
			tdi_reset(ehci);
		}
		break;
	case PCI_VENDOR_ID_AMD:
		/* AMD8111 EHCI doesn't work, according to AMD errata */
		if (pdev->device == 0x7463) {
			ehci_info(ehci, "ignoring AMD8111 (errata)\n");
			return -EIO;
		}
		break;
	case PCI_VENDOR_ID_NVIDIA:
		/* NVidia reports that certain chips don't handle
		 * QH, ITD, or SITD addresses above 2GB.  (But TD,
		 * data buffer, and periodic schedule are normal.)
		 */
		switch (pdev->device) {
		case 0x003c:	/* MCP04 */
		case 0x005b:	/* CK804 */
		case 0x00d8:	/* CK8 */
		case 0x00e8:	/* CK8S */
			if (pci_set_consistent_dma_mask(pdev,
						DMA_31BIT_MASK) < 0)
				ehci_warn(ehci, "can't enable NVidia "
					"workaround for >2GB RAM\n");
			break;
		}
		break;
	}

	if (ehci_is_TDI(ehci))
		ehci_reset(ehci);

	/* at least the Genesys GL880S needs fixup here */
	temp = HCS_N_CC(ehci->hcs_params) * HCS_N_PCC(ehci->hcs_params);
	temp &= 0x0f;
	if (temp && HCS_N_PORTS(ehci->hcs_params) > temp) {
		ehci_dbg(ehci, "bogus port configuration: "
			"cc=%d x pcc=%d < ports=%d\n",
			HCS_N_CC(ehci->hcs_params),
			HCS_N_PCC(ehci->hcs_params),
			HCS_N_PORTS(ehci->hcs_params));

		switch (pdev->vendor) {
		case 0x17a0:		/* GENESYS */
			/* GL880S: should be PORTS=2 */
			temp |= (ehci->hcs_params & ~0xf);
			ehci->hcs_params = temp;
			break;
		case PCI_VENDOR_ID_NVIDIA:
			/* NF4: should be PCC=10 */
			break;
		}
	}

	/* Serial Bus Release Number is at PCI 0x60 offset */
	pci_read_config_byte(pdev, 0x60, &ehci->sbrn);

	/* REVISIT:  per-port wake capability (PCI 0x62) currently unused */

	retval = ehci_pci_reinit(ehci, pdev);

	/* finish init */
	return ehci_init(hcd);
}

/*-------------------------------------------------------------------------*/

#ifdef	CONFIG_PM

/* suspend/resume, section 4.3 */

/* These routines rely on the PCI bus glue
 * to handle powerdown and wakeup, and currently also on
 * transceivers that don't need any software attention to set up
 * the right sort of wakeup.
 * Also they depend on separate root hub suspend/resume.
 */

static int ehci_pci_suspend(struct usb_hcd *hcd, pm_message_t message)
{
	struct ehci_hcd		*ehci = hcd_to_ehci(hcd);
	unsigned long		flags;
	int			rc = 0;

	if (time_before(jiffies, ehci->next_statechange))
		msleep(10);

	/* Root hub was already suspended. Disable irq emission and
	 * mark HW unaccessible, bail out if RH has been resumed. Use
	 * the spinlock to properly synchronize with possible pending
	 * RH suspend or resume activity.
	 *
	 * This is still racy as hcd->state is manipulated outside of
	 * any locks =P But that will be a different fix.
	 */
	spin_lock_irqsave (&ehci->lock, flags);
	if (hcd->state != HC_STATE_SUSPENDED) {
		rc = -EINVAL;
		goto bail;
	}
	writel (0, &ehci->regs->intr_enable);
	(void)readl(&ehci->regs->intr_enable);

	clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
 bail:
	spin_unlock_irqrestore (&ehci->lock, flags);

	// could save FLADJ in case of Vaux power loss
	// ... we'd only use it to handle clock skew

	return rc;
}

static int ehci_pci_resume(struct usb_hcd *hcd)
{
	struct ehci_hcd		*ehci = hcd_to_ehci(hcd);
	unsigned		port;
	struct usb_device	*root = hcd->self.root_hub;
	struct pci_dev		*pdev = to_pci_dev(hcd->self.controller);
	int			retval = -EINVAL;

	// maybe restore FLADJ

	if (time_before(jiffies, ehci->next_statechange))
		msleep(100);

	/* Mark hardware accessible again as we are out of D3 state by now */
	set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);

	/* If CF is clear, we lost PCI Vaux power and need to restart.  */
	if (readl(&ehci->regs->configured_flag) != FLAG_CF)
		goto restart;

	/* If any port is suspended (or owned by the companion),
	 * we know we can/must resume the HC (and mustn't reset it).
	 * We just defer that to the root hub code.
	 */
	for (port = HCS_N_PORTS(ehci->hcs_params); port > 0; ) {
		u32	status;
		port--;
		status = readl(&ehci->regs->port_status [port]);
		if (!(status & PORT_POWER))
			continue;
		if (status & (PORT_SUSPEND | PORT_RESUME | PORT_OWNER)) {
			usb_hcd_resume_root_hub(hcd);
			return 0;
		}
	}

restart:
	ehci_dbg(ehci, "lost power, restarting\n");
	for (port = HCS_N_PORTS(ehci->hcs_params); port > 0; ) {
		port--;
		if (!root->children [port])
			continue;
		usb_set_device_state(root->children[port],
					USB_STATE_NOTATTACHED);
	}

	/* Else reset, to cope with power loss or flush-to-storage
	 * style "resume" having let BIOS kick in during reboot.
	 */
	(void) ehci_halt(ehci);
	(void) ehci_reset(ehci);
	(void) ehci_pci_reinit(ehci, pdev);

	/* emptying the schedule aborts any urbs */
	spin_lock_irq(&ehci->lock);
	if (ehci->reclaim)
		ehci->reclaim_ready = 1;
	ehci_work(ehci, NULL);
	spin_unlock_irq(&ehci->lock);

	/* restart; khubd will disconnect devices */
	retval = ehci_run(hcd);

	/* here we "know" root ports should always stay powered */
	ehci_port_power(ehci, 1);

	return retval;
}
#endif

static const struct hc_driver ehci_pci_hc_driver = {
	.description =		hcd_name,
	.product_desc =		"EHCI Host Controller",
	.hcd_priv_size =	sizeof(struct ehci_hcd),

	/*
	 * generic hardware linkage
	 */
	.irq =			ehci_irq,
	.flags =		HCD_MEMORY | HCD_USB2,

	/*
	 * basic lifecycle operations
	 */
	.reset =		ehci_pci_reset,
	.start =		ehci_run,
#ifdef	CONFIG_PM
	.suspend =		ehci_pci_suspend,
	.resume =		ehci_pci_resume,
#endif
	.stop =			ehci_stop,

	/*
	 * managing i/o requests and associated device resources
	 */
	.urb_enqueue =		ehci_urb_enqueue,
	.urb_dequeue =		ehci_urb_dequeue,
	.endpoint_disable =	ehci_endpoint_disable,

	/*
	 * scheduling support
	 */
	.get_frame_number =	ehci_get_frame,

	/*
	 * root hub support
	 */
	.hub_status_data =	ehci_hub_status_data,
	.hub_control =		ehci_hub_control,
	.bus_suspend =		ehci_bus_suspend,
	.bus_resume =		ehci_bus_resume,
};

/*-------------------------------------------------------------------------*/

/* PCI driver selection metadata; PCI hotplugging uses this */
static const struct pci_device_id pci_ids [] = { {
	/* handle any USB 2.0 EHCI controller */
	PCI_DEVICE_CLASS(((PCI_CLASS_SERIAL_USB << 8) | 0x20), ~0),
	.driver_data =	(unsigned long) &ehci_pci_hc_driver,
	},
	{ /* end: all zeroes */ }
};
MODULE_DEVICE_TABLE(pci, pci_ids);

/* pci driver glue; this is a "new style" PCI driver module */
static struct pci_driver ehci_pci_driver = {
	.name =		(char *) hcd_name,
	.id_table =	pci_ids,

	.probe =	usb_hcd_pci_probe,
	.remove =	usb_hcd_pci_remove,

#ifdef	CONFIG_PM
	.suspend =	usb_hcd_pci_suspend,
	.resume =	usb_hcd_pci_resume,
#endif
};

static int __init ehci_hcd_pci_init(void)
{
	if (usb_disabled())
		return -ENODEV;

	pr_debug("%s: block sizes: qh %Zd qtd %Zd itd %Zd sitd %Zd\n",
		hcd_name,
		sizeof(struct ehci_qh), sizeof(struct ehci_qtd),
		sizeof(struct ehci_itd), sizeof(struct ehci_sitd));

	return pci_register_driver(&ehci_pci_driver);
}
module_init(ehci_hcd_pci_init);

static void __exit ehci_hcd_pci_cleanup(void)
{
	pci_unregister_driver(&ehci_pci_driver);
}
module_exit(ehci_hcd_pci_cleanup);
Commit	Line	Data
7ff71d6a MP	1	/*
	2	* EHCI HCD (Host Controller Driver) PCI Bus Glue.
	3	*
	4	* Copyright (c) 2000-2004 by David Brownell
	5	*
	6	* This program is free software; you can redistribute it and/or modify it
	7	* under the terms of the GNU General Public License as published by the
	8	* Free Software Foundation; either version 2 of the License, or (at your
	9	* option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful, but
	12	* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
	13	* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	14	* for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software Foundation,
	18	* Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	19	*/
	20
	21	#ifndef CONFIG_PCI
	22	#error "This file is PCI bus glue. CONFIG_PCI must be defined."
	23	#endif
	24
	25	/-------------------------------------------------------------------------/
	26
	27	/* EHCI 0.96 (and later) section 5.1 says how to kick BIOS/SMM/...
	28	* off the controller (maybe it can boot from highspeed USB disks).
	29	*/
abcc9448	30	static int bios_handoff(struct ehci_hcd *ehci, int where, u32 cap)
7ff71d6a MP	31	{
	32	struct pci_dev *pdev = to_pci_dev(ehci_to_hcd(ehci)->self.controller);
	33
	34	/* always say Linux will own the hardware */
	35	pci_write_config_byte(pdev, where + 3, 1);
	36
	37	/* maybe wait a while for BIOS to respond */
	38	if (cap & (1 << 16)) {
	39	int msec = 5000;
	40
	41	do {
	42	msleep(10);
	43	msec -= 10;
	44	pci_read_config_dword(pdev, where, &cap);
	45	} while ((cap & (1 << 16)) && msec);
	46	if (cap & (1 << 16)) {
	47	ehci_err(ehci, "BIOS handoff failed (%d, %08x)\n",
	48	where, cap);
	49	// some BIOS versions seem buggy...
	50	// return 1;
abcc9448	51	ehci_warn(ehci, "continuing after BIOS bug...\n");
7ff71d6a MP	52	/* disable all SMIs, and clear "BIOS owns" flag */
	53	pci_write_config_dword(pdev, where + 4, 0);
	54	pci_write_config_byte(pdev, where + 2, 0);
	55	} else
	56	ehci_dbg(ehci, "BIOS handoff succeeded\n");
	57	}
	58	return 0;
	59	}
	60
18807521 DB	61	/* called after powerup, by probe or system-pm "wakeup" */
	62	static int ehci_pci_reinit(struct ehci_hcd ehci, struct pci_dev pdev)
	63	{
	64	u32 temp;
	65	int retval;
	66	unsigned count = 256/4;
	67
	68	/* optional debug port, normally in the first BAR */
	69	temp = pci_find_capability(pdev, 0x0a);
	70	if (temp) {
	71	pci_read_config_dword(pdev, temp, &temp);
	72	temp >>= 16;
	73	if ((temp & (3 << 13)) == (1 << 13)) {
	74	temp &= 0x1fff;
	75	ehci->debug = ehci_to_hcd(ehci)->regs + temp;
	76	temp = readl(&ehci->debug->control);
	77	ehci_info(ehci, "debug port %d%s\n",
	78	HCS_DEBUG_PORT(ehci->hcs_params),
	79	(temp & DBGP_ENABLED)
	80	? " IN USE"
	81	: "");
	82	if (!(temp & DBGP_ENABLED))
	83	ehci->debug = NULL;
	84	}
	85	}
	86
	87	temp = HCC_EXT_CAPS(readl(&ehci->caps->hcc_params));
	88
	89	/* EHCI 0.96 and later may have "extended capabilities" */
	90	while (temp && count--) {
	91	u32 cap;
	92
	93	pci_read_config_dword(pdev, temp, &cap);
	94	ehci_dbg(ehci, "capability %04x at %02x\n", cap, temp);
	95	switch (cap & 0xff) {
	96	case 1: /* BIOS/SMM/... handoff */
	97	if (bios_handoff(ehci, temp, cap) != 0)
	98	return -EOPNOTSUPP;
	99	break;
	100	case 0: /* illegal reserved capability */
	101	ehci_dbg(ehci, "illegal capability!\n");
	102	cap = 0;
	103	/* FALLTHROUGH */
	104	default: /* unknown */
	105	break;
	106	}
	107	temp = (cap >> 8) & 0xff;
	108	}
	109	if (!count) {
	110	ehci_err(ehci, "bogus capabilities ... PCI problems!\n");
	111	return -EIO;
	112	}
	113
	114	/* PCI Memory-Write-Invalidate cycle support is optional (uncommon) */
	115	retval = pci_set_mwi(pdev);
	116	if (!retval)
	117	ehci_dbg(ehci, "MWI active\n");
	118
	119	ehci_port_power(ehci, 0);
	120
	121	return 0;
	122	}
	123
	124	/* called by khubd or root hub (re)init threads; leaves HC in halt state */
abcc9448	125	static int ehci_pci_reset(struct usb_hcd *hcd)
7ff71d6a	126	{
abcc9448 DB	127	struct ehci_hcd *ehci = hcd_to_ehci(hcd);
abcc9448 DB	128	struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
7ff71d6a	129	u32 temp;
18807521	130	int retval;
7ff71d6a MP	131
7ff71d6a MP	132	ehci->caps = hcd->regs;
abcc9448 DB	133	ehci->regs = hcd->regs + HC_LENGTH(readl(&ehci->caps->hc_capbase));
	134	dbg_hcs_params(ehci, "reset");
	135	dbg_hcc_params(ehci, "reset");
7ff71d6a MP	136
7ff71d6a MP	137	/* cache this readonly data; minimize chip reads */
abcc9448	138	ehci->hcs_params = readl(&ehci->caps->hcs_params);
7ff71d6a	139
18807521 DB	140	retval = ehci_halt(ehci);
	141	if (retval)
	142	return retval;
	143
abcc9448	144	/* NOTE: only the parts below this line are PCI-specific */
7ff71d6a	145
abcc9448 DB	146	switch (pdev->vendor) {
	147	case PCI_VENDOR_ID_TDI:
	148	if (pdev->device == PCI_DEVICE_ID_TDI_EHCI) {
	149	ehci->is_tdi_rh_tt = 1;
	150	tdi_reset(ehci);
	151	}
	152	break;
	153	case PCI_VENDOR_ID_AMD:
	154	/* AMD8111 EHCI doesn't work, according to AMD errata */
	155	if (pdev->device == 0x7463) {
	156	ehci_info(ehci, "ignoring AMD8111 (errata)\n");
	157	return -EIO;
	158	}
	159	break;
	160	case PCI_VENDOR_ID_NVIDIA:
	161	/* NVidia reports that certain chips don't handle
	162	* QH, ITD, or SITD addresses above 2GB. (But TD,
	163	* data buffer, and periodic schedule are normal.)
	164	*/
	165	switch (pdev->device) {
	166	case 0x003c: /* MCP04 */
	167	case 0x005b: /* CK804 */
	168	case 0x00d8: /* CK8 */
	169	case 0x00e8: /* CK8S */
	170	if (pci_set_consistent_dma_mask(pdev,
	171	DMA_31BIT_MASK) < 0)
	172	ehci_warn(ehci, "can't enable NVidia "
	173	"workaround for >2GB RAM\n");
7ff71d6a MP	174	break;
7ff71d6a MP	175	}
abcc9448 DB	176	break;
abcc9448 DB	177	}
7ff71d6a	178
7ff71d6a	179	if (ehci_is_TDI(ehci))
abcc9448	180	ehci_reset(ehci);
7ff71d6a	181
7ff71d6a MP	182	/* at least the Genesys GL880S needs fixup here */
	183	temp = HCS_N_CC(ehci->hcs_params) * HCS_N_PCC(ehci->hcs_params);
	184	temp &= 0x0f;
	185	if (temp && HCS_N_PORTS(ehci->hcs_params) > temp) {
abcc9448	186	ehci_dbg(ehci, "bogus port configuration: "
7ff71d6a MP	187	"cc=%d x pcc=%d < ports=%d\n",
	188	HCS_N_CC(ehci->hcs_params),
	189	HCS_N_PCC(ehci->hcs_params),
	190	HCS_N_PORTS(ehci->hcs_params));
	191
abcc9448 DB	192	switch (pdev->vendor) {
	193	case 0x17a0: /* GENESYS */
	194	/* GL880S: should be PORTS=2 */
	195	temp \|= (ehci->hcs_params & ~0xf);
	196	ehci->hcs_params = temp;
	197	break;
	198	case PCI_VENDOR_ID_NVIDIA:
	199	/* NF4: should be PCC=10 */
	200	break;
7ff71d6a MP	201	}
	202	}
	203
abcc9448 DB	204	/* Serial Bus Release Number is at PCI 0x60 offset */
abcc9448 DB	205	pci_read_config_byte(pdev, 0x60, &ehci->sbrn);
7ff71d6a	206
18807521	207	/* REVISIT: per-port wake capability (PCI 0x62) currently unused */
7ff71d6a	208
18807521	209	retval = ehci_pci_reinit(ehci, pdev);
7ff71d6a	210
18807521 DB	211	/* finish init */
18807521 DB	212	return ehci_init(hcd);
7ff71d6a MP	213	}
	214
	215	/-------------------------------------------------------------------------/
	216
	217	#ifdef CONFIG_PM
	218
	219	/* suspend/resume, section 4.3 */
	220
f03c17fc	221	/* These routines rely on the PCI bus glue
7ff71d6a MP	222	* to handle powerdown and wakeup, and currently also on
	223	* transceivers that don't need any software attention to set up
	224	* the right sort of wakeup.
f03c17fc	225	* Also they depend on separate root hub suspend/resume.
7ff71d6a MP	226	*/
7ff71d6a MP	227
abcc9448	228	static int ehci_pci_suspend(struct usb_hcd *hcd, pm_message_t message)
7ff71d6a	229	{
abcc9448	230	struct ehci_hcd *ehci = hcd_to_ehci(hcd);
8de98402 BH	231	unsigned long flags;
8de98402 BH	232	int rc = 0;
7ff71d6a	233
abcc9448 DB	234	if (time_before(jiffies, ehci->next_statechange))
abcc9448 DB	235	msleep(10);
7ff71d6a	236
8de98402 BH	237	/* Root hub was already suspended. Disable irq emission and
	238	* mark HW unaccessible, bail out if RH has been resumed. Use
	239	* the spinlock to properly synchronize with possible pending
	240	* RH suspend or resume activity.
	241	*
	242	* This is still racy as hcd->state is manipulated outside of
	243	* any locks =P But that will be a different fix.
	244	*/
	245	spin_lock_irqsave (&ehci->lock, flags);
	246	if (hcd->state != HC_STATE_SUSPENDED) {
	247	rc = -EINVAL;
	248	goto bail;
	249	}
	250	writel (0, &ehci->regs->intr_enable);
	251	(void)readl(&ehci->regs->intr_enable);
	252
	253	clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
	254	bail:
	255	spin_unlock_irqrestore (&ehci->lock, flags);
	256
f03c17fc	257	// could save FLADJ in case of Vaux power loss
7ff71d6a MP	258	// ... we'd only use it to handle clock skew
7ff71d6a MP	259
8de98402	260	return rc;
7ff71d6a MP	261	}
7ff71d6a MP	262
abcc9448	263	static int ehci_pci_resume(struct usb_hcd *hcd)
7ff71d6a	264	{
abcc9448	265	struct ehci_hcd *ehci = hcd_to_ehci(hcd);
7ff71d6a MP	266	unsigned port;
7ff71d6a MP	267	struct usb_device *root = hcd->self.root_hub;
18807521	268	struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
7ff71d6a MP	269	int retval = -EINVAL;
7ff71d6a MP	270
f03c17fc	271	// maybe restore FLADJ
7ff71d6a	272
abcc9448 DB	273	if (time_before(jiffies, ehci->next_statechange))
abcc9448 DB	274	msleep(100);
7ff71d6a	275
8de98402 BH	276	/* Mark hardware accessible again as we are out of D3 state by now */
	277	set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
	278
f03c17fc	279	/* If CF is clear, we lost PCI Vaux power and need to restart. */
18807521	280	if (readl(&ehci->regs->configured_flag) != FLAG_CF)
f03c17fc DB	281	goto restart;
f03c17fc DB	282
7ff71d6a MP	283	/* If any port is suspended (or owned by the companion),
7ff71d6a MP	284	* we know we can/must resume the HC (and mustn't reset it).
f03c17fc	285	* We just defer that to the root hub code.
7ff71d6a	286	*/
abcc9448	287	for (port = HCS_N_PORTS(ehci->hcs_params); port > 0; ) {
7ff71d6a MP	288	u32 status;
7ff71d6a MP	289	port--;
abcc9448	290	status = readl(&ehci->regs->port_status [port]);
7ff71d6a MP	291	if (!(status & PORT_POWER))
7ff71d6a MP	292	continue;
f03c17fc DB	293	if (status & (PORT_SUSPEND \| PORT_RESUME \| PORT_OWNER)) {
	294	usb_hcd_resume_root_hub(hcd);
	295	return 0;
7ff71d6a	296	}
f03c17fc DB	297	}
	298
	299	restart:
	300	ehci_dbg(ehci, "lost power, restarting\n");
abcc9448	301	for (port = HCS_N_PORTS(ehci->hcs_params); port > 0; ) {
f03c17fc	302	port--;
7ff71d6a MP	303	if (!root->children [port])
7ff71d6a MP	304	continue;
abcc9448	305	usb_set_device_state(root->children[port],
7ff71d6a MP	306	USB_STATE_NOTATTACHED);
	307	}
	308
	309	/* Else reset, to cope with power loss or flush-to-storage
f03c17fc	310	* style "resume" having let BIOS kick in during reboot.
7ff71d6a	311	*/
abcc9448 DB	312	(void) ehci_halt(ehci);
abcc9448 DB	313	(void) ehci_reset(ehci);
18807521	314	(void) ehci_pci_reinit(ehci, pdev);
f03c17fc DB	315
f03c17fc DB	316	/* emptying the schedule aborts any urbs */
abcc9448	317	spin_lock_irq(&ehci->lock);
f03c17fc DB	318	if (ehci->reclaim)
f03c17fc DB	319	ehci->reclaim_ready = 1;
abcc9448 DB	320	ehci_work(ehci, NULL);
abcc9448 DB	321	spin_unlock_irq(&ehci->lock);
f03c17fc DB	322
f03c17fc DB	323	/* restart; khubd will disconnect devices */
abcc9448	324	retval = ehci_run(hcd);
f03c17fc	325
18807521	326	/* here we "know" root ports should always stay powered */
abcc9448	327	ehci_port_power(ehci, 1);
7ff71d6a MP	328
	329	return retval;
	330	}
	331	#endif
	332
	333	static const struct hc_driver ehci_pci_hc_driver = {
	334	.description = hcd_name,
	335	.product_desc = "EHCI Host Controller",
	336	.hcd_priv_size = sizeof(struct ehci_hcd),
	337
	338	/*
	339	* generic hardware linkage
	340	*/
	341	.irq = ehci_irq,
	342	.flags = HCD_MEMORY \| HCD_USB2,
	343
	344	/*
	345	* basic lifecycle operations
	346	*/
	347	.reset = ehci_pci_reset,
18807521	348	.start = ehci_run,
7ff71d6a MP	349	#ifdef CONFIG_PM
	350	.suspend = ehci_pci_suspend,
	351	.resume = ehci_pci_resume,
	352	#endif
18807521	353	.stop = ehci_stop,
7ff71d6a MP	354
	355	/*
	356	* managing i/o requests and associated device resources
	357	*/
	358	.urb_enqueue = ehci_urb_enqueue,
	359	.urb_dequeue = ehci_urb_dequeue,
	360	.endpoint_disable = ehci_endpoint_disable,
	361
	362	/*
	363	* scheduling support
	364	*/
	365	.get_frame_number = ehci_get_frame,
	366
	367	/*
	368	* root hub support
	369	*/
	370	.hub_status_data = ehci_hub_status_data,
	371	.hub_control = ehci_hub_control,
0c0382e3 AS	372	.bus_suspend = ehci_bus_suspend,
0c0382e3 AS	373	.bus_resume = ehci_bus_resume,
7ff71d6a MP	374	};
	375
	376	/-------------------------------------------------------------------------/
	377
	378	/* PCI driver selection metadata; PCI hotplugging uses this */
	379	static const struct pci_device_id pci_ids [] = { {
	380	/* handle any USB 2.0 EHCI controller */
	381	PCI_DEVICE_CLASS(((PCI_CLASS_SERIAL_USB << 8) \| 0x20), ~0),
	382	.driver_data = (unsigned long) &ehci_pci_hc_driver,
	383	},
	384	{ /* end: all zeroes */ }
	385	};
abcc9448	386	MODULE_DEVICE_TABLE(pci, pci_ids);
7ff71d6a MP	387
	388	/* pci driver glue; this is a "new style" PCI driver module */
	389	static struct pci_driver ehci_pci_driver = {
	390	.name = (char *) hcd_name,
	391	.id_table = pci_ids,
	392
	393	.probe = usb_hcd_pci_probe,
	394	.remove = usb_hcd_pci_remove,
	395
	396	#ifdef CONFIG_PM
	397	.suspend = usb_hcd_pci_suspend,
	398	.resume = usb_hcd_pci_resume,
	399	#endif
	400	};
	401
abcc9448	402	static int __init ehci_hcd_pci_init(void)
7ff71d6a MP	403	{
	404	if (usb_disabled())
	405	return -ENODEV;
	406
abcc9448	407	pr_debug("%s: block sizes: qh %Zd qtd %Zd itd %Zd sitd %Zd\n",
7ff71d6a	408	hcd_name,
abcc9448 DB	409	sizeof(struct ehci_qh), sizeof(struct ehci_qtd),
abcc9448 DB	410	sizeof(struct ehci_itd), sizeof(struct ehci_sitd));
7ff71d6a	411
abcc9448	412	return pci_register_driver(&ehci_pci_driver);
7ff71d6a	413	}
abcc9448	414	module_init(ehci_hcd_pci_init);
7ff71d6a	415
abcc9448	416	static void __exit ehci_hcd_pci_cleanup(void)
7ff71d6a	417	{
abcc9448	418	pci_unregister_driver(&ehci_pci_driver);
7ff71d6a	419	}
abcc9448	420	module_exit(ehci_hcd_pci_cleanup);