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410 lines
11 KiB
410 lines
11 KiB
/*
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* EHCI HCD (Host Controller Driver) PCI Bus Glue.
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*
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* Copyright (c) 2000-2004 by David Brownell
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef CONFIG_PCI
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#error "This file is PCI bus glue. CONFIG_PCI must be defined."
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#endif
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/*-------------------------------------------------------------------------*/
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/* called after powerup, by probe or system-pm "wakeup" */
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static int ehci_pci_reinit(struct ehci_hcd *ehci, struct pci_dev *pdev)
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{
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u32 temp;
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int retval;
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/* optional debug port, normally in the first BAR */
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temp = pci_find_capability(pdev, 0x0a);
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if (temp) {
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pci_read_config_dword(pdev, temp, &temp);
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temp >>= 16;
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if ((temp & (3 << 13)) == (1 << 13)) {
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temp &= 0x1fff;
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ehci->debug = ehci_to_hcd(ehci)->regs + temp;
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temp = ehci_readl(ehci, &ehci->debug->control);
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ehci_info(ehci, "debug port %d%s\n",
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HCS_DEBUG_PORT(ehci->hcs_params),
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(temp & DBGP_ENABLED)
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? " IN USE"
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: "");
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if (!(temp & DBGP_ENABLED))
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ehci->debug = NULL;
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}
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}
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/* we expect static quirk code to handle the "extended capabilities"
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* (currently just BIOS handoff) allowed starting with EHCI 0.96
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*/
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/* PCI Memory-Write-Invalidate cycle support is optional (uncommon) */
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retval = pci_set_mwi(pdev);
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if (!retval)
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ehci_dbg(ehci, "MWI active\n");
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return 0;
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}
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/* called during probe() after chip reset completes */
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static int ehci_pci_setup(struct usb_hcd *hcd)
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{
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struct ehci_hcd *ehci = hcd_to_ehci(hcd);
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struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
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u32 temp;
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int retval;
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switch (pdev->vendor) {
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case PCI_VENDOR_ID_TOSHIBA_2:
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/* celleb's companion chip */
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if (pdev->device == 0x01b5) {
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#ifdef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO
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ehci->big_endian_mmio = 1;
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#else
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ehci_warn(ehci,
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"unsupported big endian Toshiba quirk\n");
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#endif
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}
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break;
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}
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ehci->caps = hcd->regs;
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ehci->regs = hcd->regs +
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HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
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dbg_hcs_params(ehci, "reset");
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dbg_hcc_params(ehci, "reset");
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/* ehci_init() causes memory for DMA transfers to be
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* allocated. Thus, any vendor-specific workarounds based on
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* limiting the type of memory used for DMA transfers must
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* happen before ehci_init() is called. */
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switch (pdev->vendor) {
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case PCI_VENDOR_ID_NVIDIA:
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/* NVidia reports that certain chips don't handle
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* QH, ITD, or SITD addresses above 2GB. (But TD,
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* data buffer, and periodic schedule are normal.)
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*/
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switch (pdev->device) {
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case 0x003c: /* MCP04 */
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case 0x005b: /* CK804 */
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case 0x00d8: /* CK8 */
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case 0x00e8: /* CK8S */
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if (pci_set_consistent_dma_mask(pdev,
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DMA_31BIT_MASK) < 0)
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ehci_warn(ehci, "can't enable NVidia "
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"workaround for >2GB RAM\n");
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break;
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}
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break;
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}
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/* cache this readonly data; minimize chip reads */
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ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
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retval = ehci_halt(ehci);
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if (retval)
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return retval;
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/* data structure init */
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retval = ehci_init(hcd);
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if (retval)
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return retval;
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switch (pdev->vendor) {
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case PCI_VENDOR_ID_TDI:
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if (pdev->device == PCI_DEVICE_ID_TDI_EHCI) {
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hcd->has_tt = 1;
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tdi_reset(ehci);
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}
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break;
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case PCI_VENDOR_ID_AMD:
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/* AMD8111 EHCI doesn't work, according to AMD errata */
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if (pdev->device == 0x7463) {
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ehci_info(ehci, "ignoring AMD8111 (errata)\n");
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retval = -EIO;
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goto done;
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}
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break;
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case PCI_VENDOR_ID_NVIDIA:
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switch (pdev->device) {
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/* Some NForce2 chips have problems with selective suspend;
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* fixed in newer silicon.
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*/
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case 0x0068:
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if (pdev->revision < 0xa4)
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ehci->no_selective_suspend = 1;
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break;
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}
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break;
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case PCI_VENDOR_ID_VIA:
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if (pdev->device == 0x3104 && (pdev->revision & 0xf0) == 0x60) {
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u8 tmp;
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/* The VT6212 defaults to a 1 usec EHCI sleep time which
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* hogs the PCI bus *badly*. Setting bit 5 of 0x4B makes
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* that sleep time use the conventional 10 usec.
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*/
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pci_read_config_byte(pdev, 0x4b, &tmp);
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if (tmp & 0x20)
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break;
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pci_write_config_byte(pdev, 0x4b, tmp | 0x20);
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}
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break;
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}
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ehci_reset(ehci);
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/* at least the Genesys GL880S needs fixup here */
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temp = HCS_N_CC(ehci->hcs_params) * HCS_N_PCC(ehci->hcs_params);
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temp &= 0x0f;
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if (temp && HCS_N_PORTS(ehci->hcs_params) > temp) {
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ehci_dbg(ehci, "bogus port configuration: "
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"cc=%d x pcc=%d < ports=%d\n",
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HCS_N_CC(ehci->hcs_params),
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HCS_N_PCC(ehci->hcs_params),
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HCS_N_PORTS(ehci->hcs_params));
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switch (pdev->vendor) {
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case 0x17a0: /* GENESYS */
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/* GL880S: should be PORTS=2 */
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temp |= (ehci->hcs_params & ~0xf);
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ehci->hcs_params = temp;
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break;
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case PCI_VENDOR_ID_NVIDIA:
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/* NF4: should be PCC=10 */
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break;
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}
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}
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/* Serial Bus Release Number is at PCI 0x60 offset */
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pci_read_config_byte(pdev, 0x60, &ehci->sbrn);
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/* Workaround current PCI init glitch: wakeup bits aren't
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* being set from PCI PM capability.
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*/
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if (!device_can_wakeup(&pdev->dev)) {
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u16 port_wake;
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pci_read_config_word(pdev, 0x62, &port_wake);
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if (port_wake & 0x0001)
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device_init_wakeup(&pdev->dev, 1);
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}
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#ifdef CONFIG_USB_SUSPEND
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/* REVISIT: the controller works fine for wakeup iff the root hub
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* itself is "globally" suspended, but usbcore currently doesn't
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* understand such things.
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*
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* System suspend currently expects to be able to suspend the entire
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* device tree, device-at-a-time. If we failed selective suspend
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* reports, system suspend would fail; so the root hub code must claim
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* success. That's lying to usbcore, and it matters for for runtime
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* PM scenarios with selective suspend and remote wakeup...
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*/
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if (ehci->no_selective_suspend && device_can_wakeup(&pdev->dev))
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ehci_warn(ehci, "selective suspend/wakeup unavailable\n");
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#endif
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ehci_port_power(ehci, 1);
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retval = ehci_pci_reinit(ehci, pdev);
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done:
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return retval;
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}
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/*-------------------------------------------------------------------------*/
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#ifdef CONFIG_PM
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/* suspend/resume, section 4.3 */
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/* These routines rely on the PCI bus glue
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* to handle powerdown and wakeup, and currently also on
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* transceivers that don't need any software attention to set up
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* the right sort of wakeup.
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* Also they depend on separate root hub suspend/resume.
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*/
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static int ehci_pci_suspend(struct usb_hcd *hcd, pm_message_t message)
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{
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struct ehci_hcd *ehci = hcd_to_ehci(hcd);
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unsigned long flags;
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int rc = 0;
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if (time_before(jiffies, ehci->next_statechange))
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msleep(10);
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/* Root hub was already suspended. Disable irq emission and
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* mark HW unaccessible, bail out if RH has been resumed. Use
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* the spinlock to properly synchronize with possible pending
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* RH suspend or resume activity.
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*
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* This is still racy as hcd->state is manipulated outside of
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* any locks =P But that will be a different fix.
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*/
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spin_lock_irqsave (&ehci->lock, flags);
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if (hcd->state != HC_STATE_SUSPENDED) {
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rc = -EINVAL;
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goto bail;
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}
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ehci_writel(ehci, 0, &ehci->regs->intr_enable);
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(void)ehci_readl(ehci, &ehci->regs->intr_enable);
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/* make sure snapshot being resumed re-enumerates everything */
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if (message.event == PM_EVENT_PRETHAW) {
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ehci_halt(ehci);
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ehci_reset(ehci);
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}
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clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
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bail:
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spin_unlock_irqrestore (&ehci->lock, flags);
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// could save FLADJ in case of Vaux power loss
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// ... we'd only use it to handle clock skew
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return rc;
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}
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static int ehci_pci_resume(struct usb_hcd *hcd)
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{
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struct ehci_hcd *ehci = hcd_to_ehci(hcd);
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struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
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// maybe restore FLADJ
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if (time_before(jiffies, ehci->next_statechange))
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msleep(100);
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/* Mark hardware accessible again as we are out of D3 state by now */
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set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
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/* If CF is still set, we maintained PCI Vaux power.
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* Just undo the effect of ehci_pci_suspend().
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*/
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if (ehci_readl(ehci, &ehci->regs->configured_flag) == FLAG_CF) {
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int mask = INTR_MASK;
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if (!hcd->self.root_hub->do_remote_wakeup)
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mask &= ~STS_PCD;
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ehci_writel(ehci, mask, &ehci->regs->intr_enable);
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ehci_readl(ehci, &ehci->regs->intr_enable);
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return 0;
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}
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ehci_dbg(ehci, "lost power, restarting\n");
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usb_root_hub_lost_power(hcd->self.root_hub);
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/* Else reset, to cope with power loss or flush-to-storage
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* style "resume" having let BIOS kick in during reboot.
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*/
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(void) ehci_halt(ehci);
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(void) ehci_reset(ehci);
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(void) ehci_pci_reinit(ehci, pdev);
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/* emptying the schedule aborts any urbs */
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spin_lock_irq(&ehci->lock);
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if (ehci->reclaim)
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end_unlink_async(ehci);
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ehci_work(ehci);
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spin_unlock_irq(&ehci->lock);
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ehci_writel(ehci, ehci->command, &ehci->regs->command);
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ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
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ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
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/* here we "know" root ports should always stay powered */
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ehci_port_power(ehci, 1);
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hcd->state = HC_STATE_SUSPENDED;
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return 0;
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}
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#endif
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static const struct hc_driver ehci_pci_hc_driver = {
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.description = hcd_name,
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.product_desc = "EHCI Host Controller",
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.hcd_priv_size = sizeof(struct ehci_hcd),
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/*
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* generic hardware linkage
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*/
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.irq = ehci_irq,
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.flags = HCD_MEMORY | HCD_USB2,
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/*
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* basic lifecycle operations
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*/
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.reset = ehci_pci_setup,
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.start = ehci_run,
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#ifdef CONFIG_PM
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.pci_suspend = ehci_pci_suspend,
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.pci_resume = ehci_pci_resume,
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#endif
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.stop = ehci_stop,
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.shutdown = ehci_shutdown,
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/*
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* managing i/o requests and associated device resources
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*/
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.urb_enqueue = ehci_urb_enqueue,
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.urb_dequeue = ehci_urb_dequeue,
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.endpoint_disable = ehci_endpoint_disable,
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/*
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* scheduling support
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*/
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.get_frame_number = ehci_get_frame,
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/*
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* root hub support
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*/
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.hub_status_data = ehci_hub_status_data,
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.hub_control = ehci_hub_control,
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.bus_suspend = ehci_bus_suspend,
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.bus_resume = ehci_bus_resume,
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.relinquish_port = ehci_relinquish_port,
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.port_handed_over = ehci_port_handed_over,
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};
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/*-------------------------------------------------------------------------*/
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/* PCI driver selection metadata; PCI hotplugging uses this */
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static const struct pci_device_id pci_ids [] = { {
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/* handle any USB 2.0 EHCI controller */
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PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_USB_EHCI, ~0),
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.driver_data = (unsigned long) &ehci_pci_hc_driver,
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},
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{ /* end: all zeroes */ }
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};
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MODULE_DEVICE_TABLE(pci, pci_ids);
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/* pci driver glue; this is a "new style" PCI driver module */
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static struct pci_driver ehci_pci_driver = {
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.name = (char *) hcd_name,
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.id_table = pci_ids,
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.probe = usb_hcd_pci_probe,
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.remove = usb_hcd_pci_remove,
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#ifdef CONFIG_PM
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.suspend = usb_hcd_pci_suspend,
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.resume = usb_hcd_pci_resume,
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#endif
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.shutdown = usb_hcd_pci_shutdown,
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};
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