/*
* 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@ucw.cz>
* (and others)
*/
#include <linux/config.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/acpi.h>
/*
* PIIX3 USB: We have to disable USB interrupts that are
* hardwired to PIRQD# and may be shared with an
* external device.
*
* Legacy Support Register (LEGSUP):
* bit13: USB PIRQ Enable (USBPIRQDEN),
* bit4: Trap/SMI On IRQ Enable (USBSMIEN).
*
* We mask out all r/wc bits, too.
*/
static void __devinit quirk_piix3_usb(struct pci_dev *dev)
{
u16 legsup;
pci_read_config_word(dev, 0xc0, &legsup);
legsup &= 0x50ef;
pci_write_config_word(dev, 0xc0, legsup);
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371SB_2, quirk_piix3_usb );
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB_2, quirk_piix3_usb );
/* FIXME these should be the guts of hcd->reset() methods; resolve all
* the differences between this version and the HCD's version.
*/
#define UHCI_USBLEGSUP 0xc0 /* legacy support */
#define UHCI_USBCMD 0 /* command register */
#define UHCI_USBSTS 2 /* status register */
#define UHCI_USBINTR 4 /* interrupt register */
#define UHCI_USBLEGSUP_DEFAULT 0x2000 /* only PIRQ enable set */
#define UHCI_USBCMD_RUN (1 << 0) /* RUN/STOP bit */
#define UHCI_USBCMD_GRESET (1 << 2) /* Global reset */
#define UHCI_USBCMD_CONFIGURE (1 << 6) /* config semaphore */
#define UHCI_USBSTS_HALTED (1 << 5) /* HCHalted bit */
#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_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_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 */
int usb_early_handoff __devinitdata = 0;
static int __init usb_handoff_early(char *str)
{
usb_early_handoff = 1;
return 0;
}
__setup("usb-handoff", usb_handoff_early);
static void __devinit quirk_usb_handoff_uhci(struct pci_dev *pdev)
{
unsigned long base = 0;
int wait_time, delta;
u16 val, sts;
int i;
for (i = 0; i < PCI_ROM_RESOURCE; i++)
if ((pci_resource_flags(pdev, i) & IORESOURCE_IO)) {
base = pci_resource_start(pdev, i);
break;
}
if (!base)
return;
/*
* stop controller
*/
sts = inw(base + UHCI_USBSTS);
val = inw(base + UHCI_USBCMD);
val &= ~(u16)(UHCI_USBCMD_RUN | UHCI_USBCMD_CONFIGURE);
outw(val, base + UHCI_USBCMD);
/*
* wait while it stops if it was running
*/
if ((sts & UHCI_USBSTS_HALTED) == 0)
{
wait_time = 1000;
delta = 100;
do {
outw(0x1f, base + UHCI_USBSTS);
udelay(delta);
wait_time -= delta;
val = inw(base + UHCI_USBSTS);
if (val & UHCI_USBSTS_HALTED)
break;
} while (wait_time > 0);
}
/*
* disable interrupts & legacy support
*/
outw(0, base + UHCI_USBINTR);
outw(0x1f, base + UHCI_USBSTS);
pci_read_config_word(pdev, UHCI_USBLEGSUP, &val);
if (val & 0xbf)
pci_write_config_word(pdev, UHCI_USBLEGSUP, UHCI_USBLEGSUP_DEFAULT);
}
static void __devinit quirk_usb_handoff_ohci(struct pci_dev *pdev)
{
void __iomem *base;
int wait_time;
base = ioremap_nocache(pci_resource_start(pdev, 0),
pci_resource_len(pdev, 0));
if (base == NULL) return;
if (readl(base + OHCI_CONTROL) & OHCI_CTRL_IR) {
wait_time = 500; /* 0.5 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);
}
}
/*
* disable interrupts
*/
writel(~(u32)0, base + OHCI_INTRDISABLE);
writel(~(u32)0, base + OHCI_INTRSTATUS);
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, temp;
u8 cap_length;
base = ioremap_nocache(pci_resource_start(pdev, 0),
pci_resource_len(pdev, 0));
if (base == NULL) return;
cap_length = readb(base);
op_reg_base = base + cap_length;
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...
*/
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);
wait_time = 500;
do {
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...
*/
printk(KERN_WARNING "EHCI early BIOS handoff "
"failed (BIOS bug ?)\n");
pci_write_config_dword(pdev,
hcc_params + EHCI_USBLEGSUP,
EHCI_USBLEGSUP_OS);
pci_write_config_dword(pdev,
hcc_params + EHCI_USBLEGCTLSTS,
0);
}
}
}
/*
* 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);
iounmap(base);
return;
}
static void __devinit quirk_usb_early_handoff(struct pci_dev *pdev)
{
if (!usb_early_handoff)
return;
if (pdev->class == ((PCI_CLASS_SERIAL_USB << 8) | 0x00)) { /* UHCI */
quirk_usb_handoff_uhci(pdev);
} else if (pdev->class == ((PCI_CLASS_SERIAL_USB << 8) | 0x10)) { /* OHCI */
quirk_usb_handoff_ohci(pdev);
} else if (pdev->class == ((PCI_CLASS_SERIAL_USB << 8) | 0x20)) { /* EHCI */
quirk_usb_disable_ehci(pdev);
}
return;
}
DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, quirk_usb_early_handoff);
