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Date: Mon, 10 Jan 2011 08:09:42 +1100
From: Benjamin Herrenschmidt <benh@...nel.crashing.org>
To: Yinghai Lu <yinghai@...nel.org>
Cc: Jesse Barnes <jbarnes@...tuousgeek.org>, Greg KH <greg@...ah.com>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
linux-usb@...r.kernel.org,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Sarah Sharp <sarah.a.sharp@...ux.intel.com>
Subject: Re: [PATCH 1/3] pci, usb: Seperate usb handoff func to another file
On Sun, 2011-01-09 at 11:59 -0800, Yinghai Lu wrote:
> Make those func can take early, num, slot, func. So later could reuse them
> to do usb handoff much early.
>
> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
That is gross...
> +
> +/* dummy functions to make compiler happy */
> +u32 __weak read_pci_config(u8 bus, u8 slot, u8 func, u8 offset)
> +{ return 0; }
> +u8 __weak read_pci_config_byte(u8 bus, u8 slot, u8 func, u8 offset)
> +{ return 0; }
> +u16 __weak read_pci_config_16(u8 bus, u8 slot, u8 func, u8 offset)
> +{ return 0; }
> +void __weak write_pci_config(u8 bus, u8 slot, u8 func, u8 offset, u32 val)
> +{ }
> +void __weak write_pci_config_byte(u8 bus, u8 slot, u8 func, u8 offset, u8 val)
> +{ }
> +void __weak write_pci_config_16(u8 bus, u8 slot, u8 func, u8 offset, u16 val)
> +{ }
Also bogus. No domain numbering for example, which is a minimum if
you're going to try to expose such "early config space" accesses (which
we do have in some form on powerpc for our own internal initialization
stuff).
But even with a domain number, that would somewhat suck. Different
architectures setup their PCI at different times and may not be capable
of dealing with domain numbers that early.
In addition, the pile of
if (early)
write_pci_*
else
pci_write_*
Are you -seriously- considering that such code is even remotely
acceptable ?
I think if you want to make the handoff happen -that- early, you have
basically two options. One is to move it all to arch code, and the other
one is to create early-boot "fake" struct pci_dev & bus that have the
config callbacks implemented pointing to the early stuff. You can do
that entirely within your arch code, and avoids most of the grossness
above in the generic places.
It would avoid that turd too:
> +#include "usb_handoff.c"
Cheers,
Ben.
> -#define UHCI_USBLEGSUP 0xc0 /* legacy support */
> -#define UHCI_USBCMD 0 /* command register */
> -#define UHCI_USBINTR 4 /* interrupt register */
> -#define UHCI_USBLEGSUP_RWC 0x8f00 /* the R/WC bits */
> -#define UHCI_USBLEGSUP_RO 0x5040 /* R/O and reserved bits */
> -#define UHCI_USBCMD_RUN 0x0001 /* RUN/STOP bit */
> -#define UHCI_USBCMD_HCRESET 0x0002 /* Host Controller reset */
> -#define UHCI_USBCMD_EGSM 0x0008 /* Global Suspend Mode */
> -#define UHCI_USBCMD_CONFIGURE 0x0040 /* Config Flag */
> -#define UHCI_USBINTR_RESUME 0x0002 /* Resume interrupt enable */
> -
> -#define OHCI_CONTROL 0x04
> -#define OHCI_CMDSTATUS 0x08
> -#define OHCI_INTRSTATUS 0x0c
> -#define OHCI_INTRENABLE 0x10
> -#define OHCI_INTRDISABLE 0x14
> -#define OHCI_OCR (1 << 3) /* ownership change request */
> -#define OHCI_CTRL_RWC (1 << 9) /* remote wakeup connected */
> -#define OHCI_CTRL_IR (1 << 8) /* interrupt routing */
> -#define OHCI_INTR_OC (1 << 30) /* ownership change */
> -
> -#define EHCI_HCC_PARAMS 0x08 /* extended capabilities */
> -#define EHCI_USBCMD 0 /* command register */
> -#define EHCI_USBCMD_RUN (1 << 0) /* RUN/STOP bit */
> -#define EHCI_USBSTS 4 /* status register */
> -#define EHCI_USBSTS_HALTED (1 << 12) /* HCHalted bit */
> -#define EHCI_USBINTR 8 /* interrupt register */
> -#define EHCI_CONFIGFLAG 0x40 /* configured flag register */
> -#define EHCI_USBLEGSUP 0 /* legacy support register */
> -#define EHCI_USBLEGSUP_BIOS (1 << 16) /* BIOS semaphore */
> -#define EHCI_USBLEGSUP_OS (1 << 24) /* OS semaphore */
> -#define EHCI_USBLEGCTLSTS 4 /* legacy control/status */
> -#define EHCI_USBLEGCTLSTS_SOOE (1 << 13) /* SMI on ownership change */
> -
> -
> -/*
> - * Make sure the controller is completely inactive, unable to
> - * generate interrupts or do DMA.
> - */
> void uhci_reset_hc(struct pci_dev *pdev, unsigned long base)
> {
> - /* Turn off PIRQ enable and SMI enable. (This also turns off the
> - * BIOS's USB Legacy Support.) Turn off all the R/WC bits too.
> - */
> - pci_write_config_word(pdev, UHCI_USBLEGSUP, UHCI_USBLEGSUP_RWC);
> -
> - /* Reset the HC - this will force us to get a
> - * new notification of any already connected
> - * ports due to the virtual disconnect that it
> - * implies.
> - */
> - outw(UHCI_USBCMD_HCRESET, base + UHCI_USBCMD);
> - mb();
> - udelay(5);
> - if (inw(base + UHCI_USBCMD) & UHCI_USBCMD_HCRESET)
> - dev_warn(&pdev->dev, "HCRESET not completed yet!\n");
> -
> - /* Just to be safe, disable interrupt requests and
> - * make sure the controller is stopped.
> - */
> - outw(0, base + UHCI_USBINTR);
> - outw(0, base + UHCI_USBCMD);
> + __uhci_reset_hc(0, pdev, 0, 0, 0, base);
> }
> EXPORT_SYMBOL_GPL(uhci_reset_hc);
>
> -/*
> - * Initialize a controller that was newly discovered or has just been
> - * resumed. In either case we can't be sure of its previous state.
> - *
> - * Returns: 1 if the controller was reset, 0 otherwise.
> - */
> int uhci_check_and_reset_hc(struct pci_dev *pdev, unsigned long base)
> {
> - u16 legsup;
> - unsigned int cmd, intr;
> -
> - /*
> - * When restarting a suspended controller, we expect all the
> - * settings to be the same as we left them:
> - *
> - * PIRQ and SMI disabled, no R/W bits set in USBLEGSUP;
> - * Controller is stopped and configured with EGSM set;
> - * No interrupts enabled except possibly Resume Detect.
> - *
> - * If any of these conditions are violated we do a complete reset.
> - */
> - pci_read_config_word(pdev, UHCI_USBLEGSUP, &legsup);
> - if (legsup & ~(UHCI_USBLEGSUP_RO | UHCI_USBLEGSUP_RWC)) {
> - dev_dbg(&pdev->dev, "%s: legsup = 0x%04x\n",
> - __func__, legsup);
> - goto reset_needed;
> - }
> -
> - cmd = inw(base + UHCI_USBCMD);
> - if ((cmd & UHCI_USBCMD_RUN) || !(cmd & UHCI_USBCMD_CONFIGURE) ||
> - !(cmd & UHCI_USBCMD_EGSM)) {
> - dev_dbg(&pdev->dev, "%s: cmd = 0x%04x\n",
> - __func__, cmd);
> - goto reset_needed;
> - }
> -
> - intr = inw(base + UHCI_USBINTR);
> - if (intr & (~UHCI_USBINTR_RESUME)) {
> - dev_dbg(&pdev->dev, "%s: intr = 0x%04x\n",
> - __func__, intr);
> - goto reset_needed;
> - }
> - return 0;
> -
> -reset_needed:
> - dev_dbg(&pdev->dev, "Performing full reset\n");
> - uhci_reset_hc(pdev, base);
> - return 1;
> + return __uhci_check_and_reset_hc(0, pdev, 0, 0, 0, base);
> }
> EXPORT_SYMBOL_GPL(uhci_check_and_reset_hc);
>
> @@ -169,7 +89,6 @@ static int __devinit mmio_resource_enabl
> static void __devinit quirk_usb_handoff_ohci(struct pci_dev *pdev)
> {
> void __iomem *base;
> - u32 control;
>
> if (!mmio_resource_enabled(pdev, 0))
> return;
> @@ -178,50 +97,14 @@ static void __devinit quirk_usb_handoff_
> if (base == NULL)
> return;
>
> - control = readl(base + OHCI_CONTROL);
> -
> -/* On PA-RISC, PDC can leave IR set incorrectly; ignore it there. */
> -#ifdef __hppa__
> -#define OHCI_CTRL_MASK (OHCI_CTRL_RWC | OHCI_CTRL_IR)
> -#else
> -#define OHCI_CTRL_MASK OHCI_CTRL_RWC
> -
> - if (control & OHCI_CTRL_IR) {
> - int wait_time = 500; /* arbitrary; 5 seconds */
> - writel(OHCI_INTR_OC, base + OHCI_INTRENABLE);
> - writel(OHCI_OCR, base + OHCI_CMDSTATUS);
> - while (wait_time > 0 &&
> - readl(base + OHCI_CONTROL) & OHCI_CTRL_IR) {
> - wait_time -= 10;
> - msleep(10);
> - }
> - if (wait_time <= 0)
> - dev_warn(&pdev->dev, "OHCI: BIOS handoff failed"
> - " (BIOS bug?) %08x\n",
> - readl(base + OHCI_CONTROL));
> - }
> -#endif
> -
> - /* reset controller, preserving RWC (and possibly IR) */
> - writel(control & OHCI_CTRL_MASK, base + OHCI_CONTROL);
> -
> - /*
> - * disable interrupts
> - */
> - writel(~(u32)0, base + OHCI_INTRDISABLE);
> - writel(~(u32)0, base + OHCI_INTRSTATUS);
> + __usb_handoff_ohci(0, pdev, 0, 0, 0, base);
>
> iounmap(base);
> }
>
> 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;
> - u8 offset, cap_length;
> - int count = 256/4;
> - int tried_handoff = 0;
> + void __iomem *base;
>
> if (!mmio_resource_enabled(pdev, 0))
> return;
> @@ -230,238 +113,23 @@ static void __devinit quirk_usb_disable_
> if (base == NULL)
> return;
>
> - 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);
> - 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)) {
> - dev_dbg(&pdev->dev, "EHCI: BIOS handoff\n");
> -
> -#if 0
> -/* aleksey_gorelov@...enix.com reports that some systems need SMI forced on,
> - * but that seems dubious in general (the BIOS left it off intentionally)
> - * and is known to prevent some systems from booting. so we won't do this
> - * unless maybe we can determine when we're on a system that needs SMI forced.
> - */
> - /* 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);
> -#endif
> -
> - /* some systems get upset if this semaphore is
> - * set for any other reason than forcing a BIOS
> - * handoff..
> - */
> - pci_write_config_byte(pdev, offset + 3, 1);
> - }
> -
> - /* if boot firmware now owns EHCI, spin till
> - * it hands it over.
> - */
> - msec = 1000;
> - while ((cap & EHCI_USBLEGSUP_BIOS) && (msec > 0)) {
> - tried_handoff = 1;
> - msleep(10);
> - 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
> - */
> - dev_warn(&pdev->dev, "EHCI: BIOS handoff failed"
> - " (BIOS bug?) %08x\n", cap);
> - pci_write_config_byte(pdev, offset + 2, 0);
> - }
> -
> - /* just in case, always disable EHCI SMIs */
> - pci_write_config_dword(pdev,
> - offset + EHCI_USBLEGCTLSTS,
> - 0);
> -
> - /* If the BIOS ever owned the controller then we
> - * can't expect any power sessions to remain intact.
> - */
> - if (tried_handoff)
> - writel(0, op_reg_base + EHCI_CONFIGFLAG);
> - break;
> - case 0: /* illegal reserved capability */
> - cap = 0;
> - /* FALLTHROUGH */
> - default:
> - dev_warn(&pdev->dev, "EHCI: unrecognized capability "
> - "%02x\n", cap & 0xff);
> - break;
> - }
> - offset = (cap >> 8) & 0xff;
> - }
> - if (!count)
> - dev_printk(KERN_DEBUG, &pdev->dev, "EHCI: capability loop?\n");
> -
> - /*
> - * halt EHCI & disable its interrupts in any case
> - */
> - val = readl(op_reg_base + EHCI_USBSTS);
> - if ((val & EHCI_USBSTS_HALTED) == 0) {
> - val = readl(op_reg_base + EHCI_USBCMD);
> - val &= ~EHCI_USBCMD_RUN;
> - writel(val, op_reg_base + EHCI_USBCMD);
> -
> - wait_time = 2000;
> - delta = 100;
> - do {
> - writel(0x3f, op_reg_base + EHCI_USBSTS);
> - udelay(delta);
> - wait_time -= delta;
> - val = readl(op_reg_base + EHCI_USBSTS);
> - if ((val == ~(u32)0) || (val & EHCI_USBSTS_HALTED)) {
> - break;
> - }
> - } while (wait_time > 0);
> - }
> - writel(0, op_reg_base + EHCI_USBINTR);
> - writel(0x3f, op_reg_base + EHCI_USBSTS);
> + __usb_handoff_ehci(0, pdev, 0, 0, 0, base);
>
> iounmap(base);
> }
>
> -/*
> - * handshake - spin reading a register until handshake completes
> - * @ptr: address of hc register to be read
> - * @mask: bits to look at in result of read
> - * @done: value of those bits when handshake succeeds
> - * @wait_usec: timeout in microseconds
> - * @delay_usec: delay in microseconds to wait between polling
> - *
> - * Polls a register every delay_usec microseconds.
> - * Returns 0 when the mask bits have the value done.
> - * Returns -ETIMEDOUT if this condition is not true after
> - * wait_usec microseconds have passed.
> - */
> -static int handshake(void __iomem *ptr, u32 mask, u32 done,
> - int wait_usec, int delay_usec)
> -{
> - u32 result;
> -
> - do {
> - result = readl(ptr);
> - result &= mask;
> - if (result == done)
> - return 0;
> - udelay(delay_usec);
> - wait_usec -= delay_usec;
> - } while (wait_usec > 0);
> - return -ETIMEDOUT;
> -}
> -
> -/**
> - * PCI Quirks for xHCI.
> - *
> - * Takes care of the handoff between the Pre-OS (i.e. BIOS) and the OS.
> - * It signals to the BIOS that the OS wants control of the host controller,
> - * and then waits 5 seconds for the BIOS to hand over control.
> - * If we timeout, assume the BIOS is broken and take control anyway.
> - */
> static void __devinit quirk_usb_handoff_xhci(struct pci_dev *pdev)
> {
> void __iomem *base;
> - int ext_cap_offset;
> - void __iomem *op_reg_base;
> - u32 val;
> - int timeout;
>
> if (!mmio_resource_enabled(pdev, 0))
> return;
>
> - base = ioremap_nocache(pci_resource_start(pdev, 0),
> - pci_resource_len(pdev, 0));
> + base = pci_ioremap_bar(pdev, 0);
> if (base == NULL)
> return;
>
> - /*
> - * Find the Legacy Support Capability register -
> - * this is optional for xHCI host controllers.
> - */
> - ext_cap_offset = xhci_find_next_cap_offset(base, XHCI_HCC_PARAMS_OFFSET);
> - do {
> - if (!ext_cap_offset)
> - /* We've reached the end of the extended capabilities */
> - goto hc_init;
> - val = readl(base + ext_cap_offset);
> - if (XHCI_EXT_CAPS_ID(val) == XHCI_EXT_CAPS_LEGACY)
> - break;
> - ext_cap_offset = xhci_find_next_cap_offset(base, ext_cap_offset);
> - } while (1);
> -
> - /* If the BIOS owns the HC, signal that the OS wants it, and wait */
> - if (val & XHCI_HC_BIOS_OWNED) {
> - writel(val & XHCI_HC_OS_OWNED, base + ext_cap_offset);
> -
> - /* Wait for 5 seconds with 10 microsecond polling interval */
> - timeout = handshake(base + ext_cap_offset, XHCI_HC_BIOS_OWNED,
> - 0, 5000, 10);
> -
> - /* Assume a buggy BIOS and take HC ownership anyway */
> - if (timeout) {
> - dev_warn(&pdev->dev, "xHCI BIOS handoff failed"
> - " (BIOS bug ?) %08x\n", val);
> - writel(val & ~XHCI_HC_BIOS_OWNED, base + ext_cap_offset);
> - }
> - }
> -
> - /* Disable any BIOS SMIs */
> - writel(XHCI_LEGACY_DISABLE_SMI,
> - base + ext_cap_offset + XHCI_LEGACY_CONTROL_OFFSET);
> -
> -hc_init:
> - op_reg_base = base + XHCI_HC_LENGTH(readl(base));
> -
> - /* Wait for the host controller to be ready before writing any
> - * operational or runtime registers. Wait 5 seconds and no more.
> - */
> - timeout = handshake(op_reg_base + XHCI_STS_OFFSET, XHCI_STS_CNR, 0,
> - 5000, 10);
> - /* Assume a buggy HC and start HC initialization anyway */
> - if (timeout) {
> - val = readl(op_reg_base + XHCI_STS_OFFSET);
> - dev_warn(&pdev->dev,
> - "xHCI HW not ready after 5 sec (HC bug?) "
> - "status = 0x%x\n", val);
> - }
> -
> - /* Send the halt and disable interrupts command */
> - val = readl(op_reg_base + XHCI_CMD_OFFSET);
> - val &= ~(XHCI_CMD_RUN | XHCI_IRQS);
> - writel(val, op_reg_base + XHCI_CMD_OFFSET);
> -
> - /* Wait for the HC to halt - poll every 125 usec (one microframe). */
> - timeout = handshake(op_reg_base + XHCI_STS_OFFSET, XHCI_STS_HALT, 1,
> - XHCI_MAX_HALT_USEC, 125);
> - if (timeout) {
> - val = readl(op_reg_base + XHCI_STS_OFFSET);
> - dev_warn(&pdev->dev,
> - "xHCI HW did not halt within %d usec "
> - "status = 0x%x\n", XHCI_MAX_HALT_USEC, val);
> - }
> + __usb_handoff_xhci(0, pdev, 0, 0, 0, base);
>
> iounmap(base);
> }
> Index: linux-2.6/drivers/usb/host/usb_handoff.c
> ===================================================================
> --- /dev/null
> +++ linux-2.6/drivers/usb/host/usb_handoff.c
> @@ -0,0 +1,501 @@
> +/*
> + * This file contains code to reset and initialize USB host controllers.
> + * Some of it includes work-arounds for PCI hardware and BIOS quirks.
> + * It may need to run early during booting -- before USB would normally
> + * initialize -- to ensure that Linux doesn't use any legacy modes.
> + *
> + * Copyright (c) 1999 Martin Mares <mj@....cz>
> + * (and others)
> + */
> +
> +#include "xhci-ext-caps.h"
> +
> +#define UHCI_USBLEGSUP 0xc0 /* legacy support */
> +#define UHCI_USBCMD 0 /* command register */
> +#define UHCI_USBINTR 4 /* interrupt register */
> +#define UHCI_USBLEGSUP_RWC 0x8f00 /* the R/WC bits */
> +#define UHCI_USBLEGSUP_RO 0x5040 /* R/O and reserved bits */
> +#define UHCI_USBCMD_RUN 0x0001 /* RUN/STOP bit */
> +#define UHCI_USBCMD_HCRESET 0x0002 /* Host Controller reset */
> +#define UHCI_USBCMD_EGSM 0x0008 /* Global Suspend Mode */
> +#define UHCI_USBCMD_CONFIGURE 0x0040 /* Config Flag */
> +#define UHCI_USBINTR_RESUME 0x0002 /* Resume interrupt enable */
> +
> +#define OHCI_CONTROL 0x04
> +#define OHCI_CMDSTATUS 0x08
> +#define OHCI_INTRSTATUS 0x0c
> +#define OHCI_INTRENABLE 0x10
> +#define OHCI_INTRDISABLE 0x14
> +#define OHCI_OCR (1 << 3) /* ownership change request */
> +#define OHCI_CTRL_RWC (1 << 9) /* remote wakeup connected */
> +#define OHCI_CTRL_IR (1 << 8) /* interrupt routing */
> +#define OHCI_INTR_OC (1 << 30) /* ownership change */
> +
> +#define EHCI_HCC_PARAMS 0x08 /* extended capabilities */
> +#define EHCI_USBCMD 0 /* command register */
> +#define EHCI_USBCMD_RUN (1 << 0) /* RUN/STOP bit */
> +#define EHCI_USBSTS 4 /* status register */
> +#define EHCI_USBSTS_HALTED (1 << 12) /* HCHalted bit */
> +#define EHCI_USBINTR 8 /* interrupt register */
> +#define EHCI_CONFIGFLAG 0x40 /* configured flag register */
> +#define EHCI_USBLEGSUP 0 /* legacy support register */
> +#define EHCI_USBLEGSUP_BIOS (1 << 16) /* BIOS semaphore */
> +#define EHCI_USBLEGSUP_OS (1 << 24) /* OS semaphore */
> +#define EHCI_USBLEGCTLSTS 4 /* legacy control/status */
> +#define EHCI_USBLEGCTLSTS_SOOE (1 << 13) /* SMI on ownership change */
> +
> +/*
> + * Make sure the controller is completely inactive, unable to
> + * generate interrupts or do DMA.
> + */
> +static inline void
> +__uhci_reset_hc(int early, struct pci_dev *pdev,
> + int num, int slot, int func, unsigned long base)
> +{
> + /* Turn off PIRQ enable and SMI enable. (This also turns off the
> + * BIOS's USB Legacy Support.) Turn off all the R/WC bits too.
> + */
> + if (!early)
> + pci_write_config_word(pdev, UHCI_USBLEGSUP, UHCI_USBLEGSUP_RWC);
> + else
> + write_pci_config_16(num, slot, func, UHCI_USBLEGSUP,
> + UHCI_USBLEGSUP_RWC);
> +
> + /* Reset the HC - this will force us to get a
> + * new notification of any already connected
> + * ports due to the virtual disconnect that it
> + * implies.
> + */
> + outw(UHCI_USBCMD_HCRESET, base + UHCI_USBCMD);
> + mb();
> + usb_handoff_udelay(5);
> + if (inw(base + UHCI_USBCMD) & UHCI_USBCMD_HCRESET) {
> + if (!early)
> + dev_warn(&pdev->dev, "HCRESET not completed yet!\n");
> + else
> + pr_warn("%02x:%02x.%01x HCRESET not completed yet!\n",
> + num, slot, func);
> + }
> +
> + /* Just to be safe, disable interrupt requests and
> + * make sure the controller is stopped.
> + */
> + outw(0, base + UHCI_USBINTR);
> + outw(0, base + UHCI_USBCMD);
> +}
> +
> +/*
> + * Initialize a controller that was newly discovered or has just been
> + * resumed. In either case we can't be sure of its previous state.
> + *
> + * Returns: 1 if the controller was reset, 0 otherwise.
> + */
> +static inline int
> +__uhci_check_and_reset_hc(int early, struct pci_dev *pdev,
> + int num, int slot, int func, unsigned long base)
> +{
> + u16 legsup;
> + unsigned int cmd, intr;
> +
> + /*
> + * When restarting a suspended controller, we expect all the
> + * settings to be the same as we left them:
> + *
> + * PIRQ and SMI disabled, no R/W bits set in USBLEGSUP;
> + * Controller is stopped and configured with EGSM set;
> + * No interrupts enabled except possibly Resume Detect.
> + *
> + * If any of these conditions are violated we do a complete reset.
> + */
> + if (!early)
> + pci_read_config_word(pdev, UHCI_USBLEGSUP, &legsup);
> + else
> + legsup = read_pci_config_16(num, slot, func, UHCI_USBLEGSUP);
> + if (legsup & ~(UHCI_USBLEGSUP_RO | UHCI_USBLEGSUP_RWC)) {
> + if (!early)
> + dev_printk(KERN_DEBUG, &pdev->dev,
> + "%s: legsup = 0x%04x\n", __func__, legsup);
> + else
> + printk(KERN_DEBUG
> + "%02x:%02x.%01x: legsup = 0x%04x\n",
> + num, slot, func, legsup);
> +
> + goto reset_needed;
> + }
> +
> + cmd = inw(base + UHCI_USBCMD);
> + if ((cmd & UHCI_USBCMD_RUN) || !(cmd & UHCI_USBCMD_CONFIGURE) ||
> + !(cmd & UHCI_USBCMD_EGSM)) {
> + if (!early)
> + dev_printk(KERN_DEBUG, &pdev->dev,
> + "%s: cmd = 0x%04x\n", __func__, cmd);
> + else
> + printk(KERN_DEBUG "%02x:%02x.%01x: cmd = 0x%04x\n",
> + num, slot, func, cmd);
> +
> + goto reset_needed;
> + }
> +
> + intr = inw(base + UHCI_USBINTR);
> + if (intr & (~UHCI_USBINTR_RESUME)) {
> + if (!early)
> + dev_printk(KERN_DEBUG, &pdev->dev,
> + "%s: intr = 0x%04x\n", __func__, intr);
> + else
> + printk(KERN_DEBUG "%02x:%02x.%01x: intr = 0x%04x\n",
> + num, slot, func, intr);
> +
> + goto reset_needed;
> + }
> + return 0;
> +
> +reset_needed:
> + if (!early)
> + dev_printk(KERN_DEBUG, &pdev->dev, "Performing full reset\n");
> + else
> + printk(KERN_DEBUG "%02x:%02x.%01x: Performing full reset\n",
> + num, slot, func);
> +
> + __uhci_reset_hc(early, pdev, num, slot, func, base);
> +
> + return 1;
> +}
> +
> +static inline void
> +__usb_handoff_ohci(int early, struct pci_dev *pdev,
> + int num, int slot, int func, void __iomem *base)
> +{
> + u32 control;
> +
> + control = readl(base + OHCI_CONTROL);
> +
> +/* On PA-RISC, PDC can leave IR set incorrectly; ignore it there. */
> +#ifdef __hppa__
> +#define OHCI_CTRL_MASK (OHCI_CTRL_RWC | OHCI_CTRL_IR)
> +#else
> +#define OHCI_CTRL_MASK OHCI_CTRL_RWC
> +
> + if (control & OHCI_CTRL_IR) {
> + int wait_time = 500; /* arbitrary; 5 seconds */
> + writel(OHCI_INTR_OC, base + OHCI_INTRENABLE);
> + writel(OHCI_OCR, base + OHCI_CMDSTATUS);
> + while (wait_time > 0 &&
> + readl(base + OHCI_CONTROL) & OHCI_CTRL_IR) {
> + wait_time -= 1;
> + usb_handoff_msleep(1);
> + }
> + if (wait_time <= 0) {
> + if (!early)
> + dev_warn(&pdev->dev,
> + "OHCI: BIOS handoff failed (BIOS bug?) %08x\n",
> + readl(base + OHCI_CONTROL));
> + else
> + pr_warn(" %02x:%02x.%01x OHCI: BIOS handoff failed (BIOS bug?) %08x\n",
> + num, slot, func,
> + readl(base + OHCI_CONTROL));
> + }
> + }
> +#endif
> +
> + /* reset controller, preserving RWC (and possibly IR) */
> + writel(control & OHCI_CTRL_MASK, base + OHCI_CONTROL);
> +
> + /*
> + * disable interrupts
> + */
> + writel(~(u32)0, base + OHCI_INTRDISABLE);
> + writel(~(u32)0, base + OHCI_INTRSTATUS);
> +}
> +
> +static inline void
> +__usb_handoff_ehci(int early, struct pci_dev *pdev,
> + int num, int slot, int func, void __iomem *base)
> +{
> + int wait_time, delta;
> + void *op_reg_base;
> + u32 hcc_params, val;
> + u8 offset, cap_length;
> + int count = 256/4;
> + int tried_handoff = 0;
> +
> + 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);
> + offset = (hcc_params >> 8) & 0xff;
> + while (offset && --count) {
> + u32 cap;
> + int msec;
> +
> + if (!early)
> + pci_read_config_dword(pdev, offset, &cap);
> + else
> + cap = read_pci_config(num, slot, func, offset);
> + switch (cap & 0xff) {
> + case 1: /* BIOS/SMM/... handoff support */
> + if ((cap & EHCI_USBLEGSUP_BIOS)) {
> + if (!early)
> + dev_printk(KERN_DEBUG, &pdev->dev,
> + "EHCI: BIOS handoff\n");
> + else
> + printk(KERN_DEBUG
> + "%02x:%02x.%01x: EHCI: BIOS handoff\n",
> + num, slot, func);
> +
> +#if 0
> +/* aleksey_gorelov@...enix.com reports that some systems need SMI forced on,
> + * but that seems dubious in general (the BIOS left it off intentionally)
> + * and is known to prevent some systems from booting. so we won't do this
> + * unless maybe we can determine when we're on a system that needs SMI forced.
> + */
> + /* 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);
> +#endif
> +
> + /* some systems get upset if this semaphore is
> + * set for any other reason than forcing a BIOS
> + * handoff..
> + */
> + if (!early)
> + pci_write_config_byte(pdev,
> + offset + 3, 1);
> + else
> + write_pci_config_byte(num, slot, func,
> + offset + 3, 1);
> + }
> +
> + /* if boot firmware now owns EHCI, spin till
> + * it hands it over.
> + */
> + msec = 1000;
> + while ((cap & EHCI_USBLEGSUP_BIOS) && (msec > 0)) {
> + tried_handoff = 1;
> + usb_handoff_msleep(1);
> + msec -= 1;
> + if (!early)
> + pci_read_config_dword(pdev, offset,
> + &cap);
> + else
> + cap = read_pci_config(num, slot, func,
> + offset);
> + }
> +
> + if (cap & EHCI_USBLEGSUP_BIOS) {
> + /* well, possibly buggy BIOS... try to shut
> + * it down, and hope nothing goes too wrong
> + */
> + if (!early) {
> + dev_warn(&pdev->dev,
> + "EHCI: BIOS handoff failed (BIOS bug?) %08x\n",
> + cap);
> + pci_write_config_byte(pdev, offset + 2,
> + 0);
> + } else {
> + pr_warn("%02x:%02x.%01x: EHCI: BIOS handoff failed (BIOS bug?) %08x\n",
> + num, slot, func, cap);
> + write_pci_config_byte(num, slot, func,
> + offset + 2, 0);
> + }
> + }
> +
> + /* just in case, always disable EHCI SMIs */
> + if (!early)
> + pci_write_config_dword(pdev,
> + offset + EHCI_USBLEGCTLSTS,
> + 0);
> + else
> + write_pci_config(num, slot, func,
> + offset + EHCI_USBLEGCTLSTS,
> + 0);
> +
> +
> + /* If the BIOS ever owned the controller then we
> + * can't expect any power sessions to remain intact.
> + */
> + if (tried_handoff)
> + writel(0, op_reg_base + EHCI_CONFIGFLAG);
> + break;
> + case 0: /* illegal reserved capability */
> + cap = 0;
> + /* FALLTHROUGH */
> + default:
> + if (!early)
> + dev_warn(&pdev->dev,
> + "EHCI: unrecognized capability %02x\n",
> + cap & 0xff);
> + else
> + pr_warn("%02x:%02x.%01x: EHCI: unrecognized capability %02x\n",
> + num, slot, func, cap & 0xff);
> + break;
> + }
> + offset = (cap >> 8) & 0xff;
> + }
> + if (!count) {
> + if (!early)
> + dev_printk(KERN_DEBUG, &pdev->dev,
> + "EHCI: capability loop?\n");
> + else
> + pr_warn("%02x:%02x.%01x: EHCI: capability loop?\n",
> + num, slot, func);
> + }
> +
> + /*
> + * halt EHCI & disable its interrupts in any case
> + */
> + val = readl(op_reg_base + EHCI_USBSTS);
> + if ((val & EHCI_USBSTS_HALTED) == 0) {
> + val = readl(op_reg_base + EHCI_USBCMD);
> + val &= ~EHCI_USBCMD_RUN;
> + writel(val, op_reg_base + EHCI_USBCMD);
> +
> + wait_time = 2000;
> + delta = 10;
> + do {
> + writel(0x3f, op_reg_base + EHCI_USBSTS);
> + usb_handoff_udelay(delta);
> + wait_time -= delta;
> + val = readl(op_reg_base + EHCI_USBSTS);
> + if ((val == ~(u32)0) || (val & EHCI_USBSTS_HALTED))
> + break;
> + } while (wait_time > 0);
> + }
> + writel(0, op_reg_base + EHCI_USBINTR);
> + writel(0x3f, op_reg_base + EHCI_USBSTS);
> +}
> +
> +/*
> + * handshake - spin reading a register until handshake completes
> + * @ptr: address of hc register to be read
> + * @mask: bits to look at in result of read
> + * @done: value of those bits when handshake succeeds
> + * @wait_usec: timeout in microseconds
> + * @delay_usec: delay in microseconds to wait between polling
> + *
> + * Polls a register every delay_usec microseconds.
> + * Returns 0 when the mask bits have the value done.
> + * Returns -ETIMEDOUT if this condition is not true after
> + * wait_usec microseconds have passed.
> + */
> +static int handshake(void __iomem *ptr, u32 mask, u32 done,
> + int wait_usec, int delay_usec)
> +{
> + u32 result;
> +
> + do {
> + result = readl(ptr);
> + result &= mask;
> + if (result == done)
> + return 0;
> + usb_handoff_udelay(delay_usec);
> + wait_usec -= delay_usec;
> + } while (wait_usec > 0);
> + return -ETIMEDOUT;
> +}
> +
> +/**
> + * PCI Quirks for xHCI.
> + *
> + * Takes care of the handoff between the Pre-OS (i.e. BIOS) and the OS.
> + * It signals to the BIOS that the OS wants control of the host controller,
> + * and then waits 5 seconds for the BIOS to hand over control.
> + * If we timeout, assume the BIOS is broken and take control anyway.
> + */
> +static inline void
> +__usb_handoff_xhci(int early, struct pci_dev *pdev,
> + int num, int slot, int func, void __iomem *base)
> +{
> + int ext_cap_offset;
> + void __iomem *op_reg_base;
> + u32 val;
> + int timeout;
> +
> + /*
> + * Find the Legacy Support Capability register -
> + * this is optional for xHCI host controllers.
> + */
> + ext_cap_offset = xhci_find_next_cap_offset(base, XHCI_HCC_PARAMS_OFFSET);
> + do {
> + if (!ext_cap_offset)
> + /* We've reached the end of the extended capabilities */
> + goto hc_init;
> + val = readl(base + ext_cap_offset);
> + if (XHCI_EXT_CAPS_ID(val) == XHCI_EXT_CAPS_LEGACY)
> + break;
> + ext_cap_offset = xhci_find_next_cap_offset(base, ext_cap_offset);
> + } while (1);
> +
> + /* If the BIOS owns the HC, signal that the OS wants it, and wait */
> + if (val & XHCI_HC_BIOS_OWNED) {
> + writel(val & XHCI_HC_OS_OWNED, base + ext_cap_offset);
> +
> + /* Wait for 5 seconds with 10 microsecond polling interval */
> + timeout = handshake(base + ext_cap_offset, XHCI_HC_BIOS_OWNED,
> + 0, 5000, 10);
> +
> + /* Assume a buggy BIOS and take HC ownership anyway */
> + if (timeout) {
> + if (!early)
> + dev_warn(&pdev->dev,
> + "xHCI BIOS handoff failed (BIOS bug ?) %08x\n",
> + val);
> + else
> + pr_warn("%02x:%02x.%01x: xHCI BIOS handoff failed (BIOS bug ?) %08x\n",
> + num, slot, func, val);
> + writel(val & ~XHCI_HC_BIOS_OWNED, base + ext_cap_offset);
> + }
> + }
> +
> + /* Disable any BIOS SMIs */
> + writel(XHCI_LEGACY_DISABLE_SMI,
> + base + ext_cap_offset + XHCI_LEGACY_CONTROL_OFFSET);
> +
> +hc_init:
> + op_reg_base = base + XHCI_HC_LENGTH(readl(base));
> +
> + /* Wait for the host controller to be ready before writing any
> + * operational or runtime registers. Wait 5 seconds and no more.
> + */
> + timeout = handshake(op_reg_base + XHCI_STS_OFFSET, XHCI_STS_CNR, 0,
> + 5000, 10);
> + /* Assume a buggy HC and start HC initialization anyway */
> + if (timeout) {
> + val = readl(op_reg_base + XHCI_STS_OFFSET);
> + if (!early)
> + dev_warn(&pdev->dev,
> + "xHCI HW not ready after 5 sec (HC bug?) status = 0x%x\n",
> + val);
> + else
> + pr_warn("%02x:%02x.%01x: xHCI HW not ready after 5 sec (HC bug?) status = 0x%x\n",
> + num, slot, func, val);
> + }
> +
> + /* Send the halt and disable interrupts command */
> + val = readl(op_reg_base + XHCI_CMD_OFFSET);
> + val &= ~(XHCI_CMD_RUN | XHCI_IRQS);
> + writel(val, op_reg_base + XHCI_CMD_OFFSET);
> +
> + /* Wait for the HC to halt - poll every 125 usec (one microframe). */
> + timeout = handshake(op_reg_base + XHCI_STS_OFFSET, XHCI_STS_HALT, 1,
> + XHCI_MAX_HALT_USEC, 125);
> + if (timeout) {
> + val = readl(op_reg_base + XHCI_STS_OFFSET);
> + if (!early)
> + dev_warn(&pdev->dev,
> + "xHCI HW did not halt within %d usec status = 0x%x\n",
> + XHCI_MAX_HALT_USEC, val);
> + else
> + pr_warn("%02x:%02x.%01x: xHCI HW did not halt within %d usec status = 0x%x",
> + num, slot, func, XHCI_MAX_HALT_USEC, val);
> + }
> +}
> --
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