- 根目录:
- 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.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/usb.h>
#include <linux/usb/hcd.h>
#include "ehci.h"
#include "pci-quirks.h"
#define DRIVER_DESC "EHCI PCI platform driver"
static const char hcd_name[] = "ehci-pci";
/* defined here to avoid adding to pci_ids.h for single instance use */
#define PCI_DEVICE_ID_INTEL_CE4100_USB 0x2e70
/*-------------------------------------------------------------------------*/
/* called after powerup, by probe or system-pm "wakeup" */
static int ehci_pci_reinit(struct ehci_hcd *ehci, struct pci_dev *pdev)
{
int retval;
/* we expect static quirk code to handle the "extended capabilities"
* (currently just BIOS handoff) allowed starting with EHCI 0.96
*/
/* PCI Memory-Write-Invalidate cycle support is optional (uncommon) */
retval = pci_set_mwi(pdev);
if (!retval)
ehci_dbg(ehci, "MWI active\n");
return 0;
}
/* called during probe() after chip reset completes */
static int ehci_pci_setup(struct usb_hcd *hcd)
{
struct ehci_hcd *ehci = hcd_to_ehci(hcd);
struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
struct pci_dev *p_smbus;
u8 rev;
u32 temp;
int retval;
ehci->caps = hcd->regs;
/*
* ehci_init() causes memory for DMA transfers to be
* allocated. Thus, any vendor-specific workarounds based on
* limiting the type of memory used for DMA transfers must
* happen before ehci_setup() is called.
*
* Most other workarounds can be done either before or after
* init and reset; they are located here too.
*/
switch (pdev->vendor) {
case PCI_VENDOR_ID_TOSHIBA_2:
/* celleb's companion chip */
if (pdev->device == 0x01b5) {
#ifdef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO
ehci->big_endian_mmio = 1;
#else
ehci_warn(ehci,
"unsupported big endian Toshiba quirk\n");
#endif
}
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_BIT_MASK(31)) < 0)
ehci_warn(ehci, "can't enable NVidia "
"workaround for >2GB RAM\n");
break;
/* Some NForce2 chips have problems with selective suspend;
* fixed in newer silicon.
*/
case 0x0068:
if (pdev->revision < 0xa4)
ehci->no_selective_suspend = 1;
break;
}
break;
case PCI_VENDOR_ID_INTEL:
if (pdev->device == PCI_DEVICE_ID_INTEL_CE4100_USB)
hcd->has_tt = 1;
break;
case PCI_VENDOR_ID_TDI:
if (pdev->device == PCI_DEVICE_ID_TDI_EHCI)
hcd->has_tt = 1;
break;
case PCI_VENDOR_ID_AMD:
/* AMD PLL quirk */
if (usb_amd_find_chipset_info())
ehci->amd_pll_fix = 1;
/* AMD8111 EHCI doesn't work, according to AMD errata */
if (pdev->device == 0x7463) {
ehci_info(ehci, "ignoring AMD8111 (errata)\n");
retval = -EIO;
goto done;
}
/*
* EHCI controller on AMD SB700/SB800/Hudson-2/3 platforms may
* read/write memory space which does not belong to it when
* there is NULL pointer with T-bit set to 1 in the frame list
* table. To avoid the issue, the frame list link pointer
* should always contain a valid pointer to a inactive qh.
*/
if (pdev->device == 0x7808) {
ehci->use_dummy_qh = 1;
ehci_info(ehci, "applying AMD SB700/SB800/Hudson-2/3 EHCI dummy qh workaround\n");
}
break;
case PCI_VENDOR_ID_VIA:
if (pdev->device == 0x3104 && (pdev->revision & 0xf0) == 0x60) {
u8 tmp;
/* The VT6212 defaults to a 1 usec EHCI sleep time which
* hogs the PCI bus *badly*. Setting bit 5 of 0x4B makes
* that sleep time use the conventional 10 usec.
*/
pci_read_config_byte(pdev, 0x4b, &tmp);
if (tmp & 0x20)
break;
pci_write_config_byte(pdev, 0x4b, tmp | 0x20);
}
break;
case PCI_VENDOR_ID_ATI:
/* AMD PLL quirk */
if (usb_amd_find_chipset_info())
ehci->amd_pll_fix = 1;
/*
* EHCI controller on AMD SB700/SB800/Hudson-2/3 platforms may
* read/write memory space which does not belong to it when
* there is NULL pointer with T-bit set to 1 in the frame list
* table. To avoid the issue, the frame list link pointer
* should always contain a valid pointer to a inactive qh.
*/
if (pdev->device == 0x4396) {
ehci->use_dummy_qh = 1;
ehci_info(ehci, "applying AMD SB700/SB800/Hudson-2/3 EHCI dummy qh workaround\n");
}
/* SB600 and old version of SB700 have a bug in EHCI controller,
* which causes usb devices lose response in some cases.
*/
if ((pdev->device == 0x4386) || (pdev->device == 0x4396)) {
p_smbus = pci_get_device(PCI_VENDOR_ID_ATI,
PCI_DEVICE_ID_ATI_SBX00_SMBUS,
NULL);
if (!p_smbus)
break;
rev = p_smbus->revision;
if ((pdev->device == 0x4386) || (rev == 0x3a)
|| (rev == 0x3b)) {
u8 tmp;
ehci_info(ehci, "applying AMD SB600/SB700 USB "
"freeze workaround\n");
pci_read_config_byte(pdev, 0x53, &tmp);
pci_write_config_byte(pdev, 0x53, tmp | (1<<3));
}
pci_dev_put(p_smbus);
}
break;
case PCI_VENDOR_ID_NETMOS:
/* MosChip frame-index-register bug */
ehci_info(ehci, "applying MosChip frame-index workaround\n");
ehci->frame_index_bug = 1;
break;
}
/* optional debug port, normally in the first BAR */
temp = pci_find_capability(pdev, PCI_CAP_ID_DBG);
if (temp) {
pci_read_config_dword(pdev, temp, &temp);
temp >>= 16;
if (((temp >> 13) & 7) == 1) {
u32 hcs_params = ehci_readl(ehci,
&ehci->caps->hcs_params);
temp &= 0x1fff;
ehci->debug = hcd->regs + temp;
temp = ehci_readl(ehci, &ehci->debug->control);
ehci_info(ehci, "debug port %d%s\n",
HCS_DEBUG_PORT(hcs_params),
(temp & DBGP_ENABLED) ? " IN USE" : "");
if (!(temp & DBGP_ENABLED))
ehci->debug = NULL;
}
}
retval = ehci_setup(hcd);
if (retval)
return retval;
/* These workarounds need to be applied after ehci_setup() */
switch (pdev->vendor) {
case PCI_VENDOR_ID_NEC:
ehci->need_io_watchdog = 0;
break;
case PCI_VENDOR_ID_INTEL:
ehci->need_io_watchdog = 0;
break;
case PCI_VENDOR_ID_NVIDIA:
switch (pdev->device) {
/* MCP89 chips on the MacBookAir3,1 give EPROTO when
* fetching device descriptors unless LPM is disabled.
* There are also intermittent problems enumerating
* devices with PPCD enabled.
*/
case 0x0d9d:
ehci_info(ehci, "disable ppcd for nvidia mcp89\n");
ehci->has_ppcd = 0;
ehci->command &= ~CMD_PPCEE;
break;
}
break;
}
/* 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 */
if (pdev->vendor == PCI_VENDOR_ID_STMICRO
&& pdev->device == PCI_DEVICE_ID_STMICRO_USB_HOST)
; /* ConneXT has no sbrn register */
else
pci_read_config_byte(pdev, 0x60, &ehci->sbrn);
/* Keep this around for a while just in case some EHCI
* implementation uses legacy PCI PM support. This test
* can be removed on 17 Dec 2009 if the dev_warn() hasn't
* been triggered by then.
*/
if (!device_can_wakeup(&pdev->dev)) {
u16 port_wake;
pci_read_config_word(pdev, 0x62, &port_wake);
if (port_wake & 0x0001) {
dev_warn(&pdev->dev, "Enabling legacy PCI PM\n");
device_set_wakeup_capable(&pdev->dev, 1);
}
}
#ifdef CONFIG_PM_RUNTIME
if (ehci->no_selective_suspend && device_can_wakeup(&pdev->dev))
ehci_warn(ehci, "selective suspend/wakeup unavailable\n");
#endif
retval = ehci_pci_reinit(ehci, pdev);
done:
return retval;
}
/*-------------------------------------------------------------------------*/
#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 bool usb_is_intel_switchable_ehci(struct pci_dev *pdev)
{
return pdev->class == PCI_CLASS_SERIAL_USB_EHCI &&
pdev->vendor == PCI_VENDOR_ID_INTEL &&
(pdev->device == 0x1E26 ||
pdev->device == 0x8C2D ||
pdev->device == 0x8C26 ||
pdev->device == 0x9C26);
}
static void ehci_enable_xhci_companion(void)
{
struct pci_dev *companion = NULL;
/* The xHCI and EHCI controllers are not on the same PCI slot */
for_each_pci_dev(companion) {
if (!usb_is_intel_switchable_xhci(companion))
continue;
usb_enable_xhci_ports(companion);
return;
}
}
static int ehci_pci_resume(struct usb_hcd *hcd, bool hibernated)
{
struct ehci_hcd *ehci = hcd_to_ehci(hcd);
struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
/* The BIOS on systems with the Intel Panther Point chipset may or may
* not support xHCI natively. That means that during system resume, it
* may switch the ports back to EHCI so that users can use their
* keyboard to select a kernel from GRUB after resume from hibernate.
*
* The BIOS is supposed to remember whether the OS had xHCI ports
* enabled before resume, and switch the ports back to xHCI when the
* BIOS/OS semaphore is written, but we all know we can't trust BIOS
* writers.
*
* Unconditionally switch the ports back to xHCI after a system resume.
* We can't tell whether the EHCI or xHCI controller will be resumed
* first, so we have to do the port switchover in both drivers. Writing
* a '1' to the port switchover registers should have no effect if the
* port was already switched over.
*/
if (usb_is_intel_switchable_ehci(pdev))
ehci_enable_xhci_companion();
if (ehci_resume(hcd, hibernated) != 0)
(void) ehci_pci_reinit(ehci, pdev);
return 0;
}
#else
#define ehci_suspend NULL
#define ehci_pci_resume NULL
#endif /* CONFIG_PM */
static struct hc_driver __read_mostly ehci_pci_hc_driver;
static const struct ehci_driver_overrides pci_overrides __initconst = {
.reset = ehci_pci_setup,
};
/*-------------------------------------------------------------------------*/
/* 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_EHCI, ~0),
.driver_data = (unsigned long) &ehci_pci_hc_driver,
}, {
PCI_VDEVICE(STMICRO, PCI_DEVICE_ID_STMICRO_USB_HOST),
.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,
.shutdown = usb_hcd_pci_shutdown,
#ifdef CONFIG_PM_SLEEP
.driver = {
.pm = &usb_hcd_pci_pm_ops
},
#endif
};
static int __init ehci_pci_init(void)
{
if (usb_disabled())
return -ENODEV;
pr_info("%s: " DRIVER_DESC "\n", hcd_name);
ehci_init_driver(&ehci_pci_hc_driver, &pci_overrides);
/* Entries for the PCI suspend/resume callbacks are special */
ehci_pci_hc_driver.pci_suspend = ehci_suspend;
ehci_pci_hc_driver.pci_resume = ehci_pci_resume;
return pci_register_driver(&ehci_pci_driver);
}
module_init(ehci_pci_init);
static void __exit ehci_pci_cleanup(void)
{
pci_unregister_driver(&ehci_pci_driver);
}
module_exit(ehci_pci_cleanup);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_AUTHOR("David Brownell");
MODULE_AUTHOR("Alan Stern");
MODULE_LICENSE("GPL");