From: David Brownell Date: Tue, 24 Jan 2006 15:15:30 +0000 (-0800) Subject: [PATCH] USB: fix EHCI early handoff issues X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=401feafa621ba98ecaeed5db1a53ab878943c225;p=openwrt%2Fstaging%2Fblogic.git [PATCH] USB: fix EHCI early handoff issues This moves the previously widely-used ehci-pci.c BIOS handoff code into the pci-quirks.c file, replacing the less widely used "early handoff" version that seems to cause problems lately. One notable change: the "early handoff" version always enabled an SMI IRQ ... and did so even if the pre-Linux code said it was not using EHCI (and not expecting EHCI SMIs). Looks like a goof in a workaround for some unknown BIOS version. This merged version only forcibly enables those IRQs when pre-Linux code says it's using EHCI. And now it always forces them off "just in case". Signed-off-by: David Brownell Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/usb/host/ehci-pci.c b/drivers/usb/host/ehci-pci.c index 08ca0f849dab..286b2f4acdc2 100644 --- a/drivers/usb/host/ehci-pci.c +++ b/drivers/usb/host/ehci-pci.c @@ -24,40 +24,6 @@ /*-------------------------------------------------------------------------*/ -/* 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) { @@ -84,32 +50,9 @@ static int ehci_pci_reinit(struct ehci_hcd *ehci, struct pci_dev *pdev) } } - 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; - } + /* 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); diff --git a/drivers/usb/host/pci-quirks.c b/drivers/usb/host/pci-quirks.c index 3ef2c0cdf1db..e9e5bc178cef 100644 --- a/drivers/usb/host/pci-quirks.c +++ b/drivers/usb/host/pci-quirks.c @@ -190,7 +190,7 @@ static void __devinit quirk_usb_handoff_ohci(struct pci_dev *pdev) msleep(10); } if (wait_time <= 0) - printk(KERN_WARNING "%s %s: early BIOS handoff " + printk(KERN_WARNING "%s %s: BIOS handoff " "failed (BIOS bug ?)\n", pdev->dev.bus_id, "OHCI"); @@ -212,8 +212,9 @@ static void __devinit quirk_usb_disable_ehci(struct pci_dev *pdev) { int wait_time, delta; void __iomem *base, *op_reg_base; - u32 hcc_params, val, temp; - u8 cap_length; + u32 hcc_params, val; + u8 offset, cap_length; + int count = 256/4; if (!mmio_resource_enabled(pdev, 0)) return; @@ -224,51 +225,80 @@ static void __devinit quirk_usb_disable_ehci(struct pci_dev *pdev) cap_length = readb(base); op_reg_base = base + cap_length; + + /* EHCI 0.96 and later may have "extended capabilities" + * spec section 5.1 explains the bios handoff, e.g. for + * booting from USB disk or using a usb keyboard + */ hcc_params = readl(base + EHCI_HCC_PARAMS); - hcc_params = (hcc_params >> 8) & 0xff; - if (hcc_params) { - pci_read_config_dword(pdev, - hcc_params + EHCI_USBLEGSUP, - &val); - if (((val & 0xff) == 1) && (val & EHCI_USBLEGSUP_BIOS)) { - /* - * Ok, BIOS is in smm mode, try to hand off... + offset = (hcc_params >> 8) & 0xff; + while (offset && count--) { + u32 cap; + int msec; + + pci_read_config_dword(pdev, offset, &cap); + switch (cap & 0xff) { + case 1: /* BIOS/SMM/... handoff support */ + if ((cap & EHCI_USBLEGSUP_BIOS)) { + pr_debug("%s %s: BIOS handoff\n", + pdev->dev.bus_id, "EHCI"); + + /* BIOS workaround (?): be sure the + * pre-Linux code receives the SMI + */ + pci_read_config_dword(pdev, + offset + EHCI_USBLEGCTLSTS, + &val); + pci_write_config_dword(pdev, + offset + EHCI_USBLEGCTLSTS, + val | EHCI_USBLEGCTLSTS_SOOE); + } + + /* always say Linux will own the hardware + * by setting EHCI_USBLEGSUP_OS. */ - pci_read_config_dword(pdev, - hcc_params + EHCI_USBLEGCTLSTS, - &temp); - pci_write_config_dword(pdev, - hcc_params + EHCI_USBLEGCTLSTS, - temp | EHCI_USBLEGCTLSTS_SOOE); - val |= EHCI_USBLEGSUP_OS; - pci_write_config_dword(pdev, - hcc_params + EHCI_USBLEGSUP, - val); + pci_write_config_byte(pdev, offset + 3, 1); - wait_time = 500; - do { + /* if boot firmware now owns EHCI, spin till + * it hands it over. + */ + msec = 5000; + while ((cap & EHCI_USBLEGSUP_BIOS) && (msec > 0)) { msleep(10); - wait_time -= 10; - pci_read_config_dword(pdev, - hcc_params + EHCI_USBLEGSUP, - &val); - } while (wait_time && (val & EHCI_USBLEGSUP_BIOS)); - if (!wait_time) { - /* - * well, possibly buggy BIOS... + msec -= 10; + pci_read_config_dword(pdev, offset, &cap); + } + + if (cap & EHCI_USBLEGSUP_BIOS) { + /* well, possibly buggy BIOS... try to shut + * it down, and hope nothing goes too wrong */ - printk(KERN_WARNING "%s %s: early BIOS handoff " + printk(KERN_WARNING "%s %s: BIOS handoff " "failed (BIOS bug ?)\n", pdev->dev.bus_id, "EHCI"); - pci_write_config_dword(pdev, - hcc_params + EHCI_USBLEGSUP, - EHCI_USBLEGSUP_OS); - pci_write_config_dword(pdev, - hcc_params + EHCI_USBLEGCTLSTS, - 0); + pci_write_config_byte(pdev, offset + 2, 0); } + + /* just in case, always disable EHCI SMIs */ + pci_write_config_dword(pdev, + offset + EHCI_USBLEGCTLSTS, + 0); + break; + case 0: /* illegal reserved capability */ + cap = 0; + /* FALLTHROUGH */ + default: + printk(KERN_WARNING "%s %s: unrecognized " + "capability %02x\n", + pdev->dev.bus_id, "EHCI", + cap & 0xff); + break; } + offset = (cap >> 8) & 0xff; } + if (!count) + printk(KERN_DEBUG "%s %s: capability loop?\n", + pdev->dev.bus_id, "EHCI"); /* * halt EHCI & disable its interrupts in any case