So later could reuse them to do usb handoff much early for x86.
will make arch early code get MMIO BAR and do remapping itself.
-v2: still keep pci_device *pdev as parameter according to BenH.
Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>
---
drivers/usb/host/pci-quirks.c | 382 +-------------------------------------
drivers/usb/host/usb_handoff.c | 402 +++++++++++++++++++++++++++++++++++++++++
2 files changed, 420 insertions(+), 364 deletions(-)
Index: linux-2.6/drivers/usb/host/pci-quirks.c
===================================================================
--- linux-2.6.orig/drivers/usb/host/pci-quirks.c
+++ linux-2.6/drivers/usb/host/pci-quirks.c
@@ -15,122 +15,28 @@
#include <linux/delay.h>
#include <linux/acpi.h>
#include "pci-quirks.h"
-#include "xhci-ext-caps.h"
+static void usb_handoff_udelay(unsigned long usecs)
+{
+ udelay(usecs);
+}
+
+static void usb_handoff_msleep(unsigned long msecs)
+{
+ msleep(msecs);
+}
+
+#include "usb_handoff.c"
-#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(pdev, 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(pdev, base);
}
EXPORT_SYMBOL_GPL(uhci_check_and_reset_hc);
@@ -169,7 +75,6 @@ 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 +83,14 @@ 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(pdev, 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 +99,23 @@ 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@xxxxxxxxxxx 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(pdev, 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(pdev, 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 +1,402 @@
+/*
+ * 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@xxxxxx>
+ * (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 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();
+ usb_handoff_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);
+}
+
+/*
+ * 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(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_printk(KERN_DEBUG, &pdev->dev,
+ ": legsup = 0x%04x\n", legsup);
+ goto reset_needed;
+ }
+
+ cmd = inw(base + UHCI_USBCMD);
+ if ((cmd & UHCI_USBCMD_RUN) || !(cmd & UHCI_USBCMD_CONFIGURE) ||
+ !(cmd & UHCI_USBCMD_EGSM)) {
+ dev_printk(KERN_DEBUG, &pdev->dev, ": cmd = 0x%04x\n", cmd);
+ goto reset_needed;
+ }
+
+ intr = inw(base + UHCI_USBINTR);
+ if (intr & (~UHCI_USBINTR_RESUME)) {
+ dev_printk(KERN_DEBUG, &pdev->dev, ": intr = 0x%04x\n",intr);
+ goto reset_needed;
+ }
+ return 0;
+
+reset_needed:
+ dev_printk(KERN_DEBUG, &pdev->dev, "Performing full reset\n");
+
+ __uhci_reset_hc(pdev, base);
+
+ return 1;
+}
+
+static inline void
+__usb_handoff_ohci(struct pci_dev *pdev, 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)
+ 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);
+}
+
+static inline void
+__usb_handoff_ehci(struct pci_dev *pdev, 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;
+
+ pci_read_config_dword(pdev, offset, &cap);
+ switch (cap & 0xff) {
+ case 1: /* BIOS/SMM/... handoff support */
+ if ((cap & EHCI_USBLEGSUP_BIOS)) {
+ dev_printk(KERN_DEBUG, &pdev->dev,
+ "EHCI: BIOS handoff\n");
+
+#if 0
+/* aleksey_gorelov@xxxxxxxxxxx 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;
+ usb_handoff_msleep(1);
+ msec -= 1;
+ 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 = 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(struct pci_dev *pdev, 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) {
+ 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);
+ }
+}
--
To unsubscribe from this list: send the line "unsubscribe linux-pci" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
