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kernel-ark/arch/x86/kernel/quirks.c
Zbigniew Luszpinski 96bcf458cb x86: hpet clock enable quirk on nVidia nForce 430 
this patch allows hpet=force on nVidia nForce 430 southbridge.
This patch was tested by me on my old Asus A8N-VM CSM (where bios does not
support hpet and does not advertise it via acpi entry). My nForce430 version:
lspci -nn | grep LPC
00:0a.0 ISA bridge [0601]: nVidia Corporation MCP51 LPC Bridge [10de:0260]
(rev a2)

Kernel 2.6.24.3 after patching and using hpet=force reports this:
dmesg | grep -i hpet
Kernel command line: root=/dev/sda8 ro vga=773 video=vesafb:mtrr:4,ywrap
vt.default_utf8=0 hpet=force
Force enabled HPET at base address 0xfed00000
hpet clockevent registered
Time: hpet clocksource has been installed.

grep -i hpet /proc/timer_list
Clock Event Device: hpet
 set_next_event: hpet_legacy_next_event
 set_mode:       hpet_legacy_set_mode

grep Clock /proc/timer_list (before patching)
Clock Event Device: pit
Clock Event Device: lapic

grep Clock /proc/timer_list (after patching)
Clock Event Device: hpet
Clock Event Device: lapic

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-03-21 17:06:15 +01:00

406 lines
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/*
* This file contains work-arounds for x86 and x86_64 platform bugs.
*/
#include <linux/pci.h>
#include <linux/irq.h>
#include <asm/hpet.h>
#if defined(CONFIG_X86_IO_APIC) && defined(CONFIG_SMP) && defined(CONFIG_PCI)
static void __devinit quirk_intel_irqbalance(struct pci_dev *dev)
{
u8 config, rev;
u16 word;
/* BIOS may enable hardware IRQ balancing for
* E7520/E7320/E7525(revision ID 0x9 and below)
* based platforms.
* Disable SW irqbalance/affinity on those platforms.
*/
pci_read_config_byte(dev, PCI_CLASS_REVISION, &rev);
if (rev > 0x9)
return;
/* enable access to config space*/
pci_read_config_byte(dev, 0xf4, &config);
pci_write_config_byte(dev, 0xf4, config|0x2);
/*
* read xTPR register. We may not have a pci_dev for device 8
* because it might be hidden until the above write.
*/
pci_bus_read_config_word(dev->bus, PCI_DEVFN(8, 0), 0x4c, &word);
if (!(word & (1 << 13))) {
dev_info(&dev->dev, "Intel E7520/7320/7525 detected; "
"disabling irq balancing and affinity\n");
#ifdef CONFIG_IRQBALANCE
irqbalance_disable("");
#endif
noirqdebug_setup("");
#ifdef CONFIG_PROC_FS
no_irq_affinity = 1;
#endif
}
/* put back the original value for config space*/
if (!(config & 0x2))
pci_write_config_byte(dev, 0xf4, config);
}
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_E7320_MCH,
quirk_intel_irqbalance);
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_E7525_MCH,
quirk_intel_irqbalance);
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_E7520_MCH,
quirk_intel_irqbalance);
#endif
#if defined(CONFIG_HPET_TIMER)
unsigned long force_hpet_address;
static enum {
NONE_FORCE_HPET_RESUME,
OLD_ICH_FORCE_HPET_RESUME,
ICH_FORCE_HPET_RESUME,
VT8237_FORCE_HPET_RESUME,
NVIDIA_FORCE_HPET_RESUME,
} force_hpet_resume_type;
static void __iomem *rcba_base;
static void ich_force_hpet_resume(void)
{
u32 val;
if (!force_hpet_address)
return;
if (rcba_base == NULL)
BUG();
/* read the Function Disable register, dword mode only */
val = readl(rcba_base + 0x3404);
if (!(val & 0x80)) {
/* HPET disabled in HPTC. Trying to enable */
writel(val | 0x80, rcba_base + 0x3404);
}
val = readl(rcba_base + 0x3404);
if (!(val & 0x80))
BUG();
else
printk(KERN_DEBUG "Force enabled HPET at resume\n");
return;
}
static void ich_force_enable_hpet(struct pci_dev *dev)
{
u32 val;
u32 uninitialized_var(rcba);
int err = 0;
if (hpet_address || force_hpet_address)
return;
pci_read_config_dword(dev, 0xF0, &rcba);
rcba &= 0xFFFFC000;
if (rcba == 0) {
dev_printk(KERN_DEBUG, &dev->dev, "RCBA disabled; "
"cannot force enable HPET\n");
return;
}
/* use bits 31:14, 16 kB aligned */
rcba_base = ioremap_nocache(rcba, 0x4000);
if (rcba_base == NULL) {
dev_printk(KERN_DEBUG, &dev->dev, "ioremap failed; "
"cannot force enable HPET\n");
return;
}
/* read the Function Disable register, dword mode only */
val = readl(rcba_base + 0x3404);
if (val & 0x80) {
/* HPET is enabled in HPTC. Just not reported by BIOS */
val = val & 0x3;
force_hpet_address = 0xFED00000 | (val << 12);
dev_printk(KERN_DEBUG, &dev->dev, "Force enabled HPET at "
"0x%lx\n", force_hpet_address);
iounmap(rcba_base);
return;
}
/* HPET disabled in HPTC. Trying to enable */
writel(val | 0x80, rcba_base + 0x3404);
val = readl(rcba_base + 0x3404);
if (!(val & 0x80)) {
err = 1;
} else {
val = val & 0x3;
force_hpet_address = 0xFED00000 | (val << 12);
}
if (err) {
force_hpet_address = 0;
iounmap(rcba_base);
dev_printk(KERN_DEBUG, &dev->dev,
"Failed to force enable HPET\n");
} else {
force_hpet_resume_type = ICH_FORCE_HPET_RESUME;
dev_printk(KERN_DEBUG, &dev->dev, "Force enabled HPET at "
"0x%lx\n", force_hpet_address);
}
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ESB2_0,
ich_force_enable_hpet);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_1,
ich_force_enable_hpet);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH7_0,
ich_force_enable_hpet);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH7_1,
ich_force_enable_hpet);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH7_31,
ich_force_enable_hpet);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH8_1,
ich_force_enable_hpet);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH9_7,
ich_force_enable_hpet);
static struct pci_dev *cached_dev;
static void old_ich_force_hpet_resume(void)
{
u32 val;
u32 uninitialized_var(gen_cntl);
if (!force_hpet_address || !cached_dev)
return;
pci_read_config_dword(cached_dev, 0xD0, &gen_cntl);
gen_cntl &= (~(0x7 << 15));
gen_cntl |= (0x4 << 15);
pci_write_config_dword(cached_dev, 0xD0, gen_cntl);
pci_read_config_dword(cached_dev, 0xD0, &gen_cntl);
val = gen_cntl >> 15;
val &= 0x7;
if (val == 0x4)
printk(KERN_DEBUG "Force enabled HPET at resume\n");
else
BUG();
}
static void old_ich_force_enable_hpet(struct pci_dev *dev)
{
u32 val;
u32 uninitialized_var(gen_cntl);
if (hpet_address || force_hpet_address)
return;
pci_read_config_dword(dev, 0xD0, &gen_cntl);
/*
* Bit 17 is HPET enable bit.
* Bit 16:15 control the HPET base address.
*/
val = gen_cntl >> 15;
val &= 0x7;
if (val & 0x4) {
val &= 0x3;
force_hpet_address = 0xFED00000 | (val << 12);
dev_printk(KERN_DEBUG, &dev->dev, "HPET at 0x%lx\n",
force_hpet_address);
return;
}
/*
* HPET is disabled. Trying enabling at FED00000 and check
* whether it sticks
*/
gen_cntl &= (~(0x7 << 15));
gen_cntl |= (0x4 << 15);
pci_write_config_dword(dev, 0xD0, gen_cntl);
pci_read_config_dword(dev, 0xD0, &gen_cntl);
val = gen_cntl >> 15;
val &= 0x7;
if (val & 0x4) {
/* HPET is enabled in HPTC. Just not reported by BIOS */
val &= 0x3;
force_hpet_address = 0xFED00000 | (val << 12);
dev_printk(KERN_DEBUG, &dev->dev, "Force enabled HPET at "
"0x%lx\n", force_hpet_address);
cached_dev = dev;
force_hpet_resume_type = OLD_ICH_FORCE_HPET_RESUME;
return;
}
dev_printk(KERN_DEBUG, &dev->dev, "Failed to force enable HPET\n");
}
/*
* Undocumented chipset features. Make sure that the user enforced
* this.
*/
static void old_ich_force_enable_hpet_user(struct pci_dev *dev)
{
if (hpet_force_user)
old_ich_force_enable_hpet(dev);
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_0,
old_ich_force_enable_hpet_user);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_12,
old_ich_force_enable_hpet_user);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_0,
old_ich_force_enable_hpet_user);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_12,
old_ich_force_enable_hpet_user);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_0,
old_ich_force_enable_hpet);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_12,
old_ich_force_enable_hpet);
static void vt8237_force_hpet_resume(void)
{
u32 val;
if (!force_hpet_address || !cached_dev)
return;
val = 0xfed00000 | 0x80;
pci_write_config_dword(cached_dev, 0x68, val);
pci_read_config_dword(cached_dev, 0x68, &val);
if (val & 0x80)
printk(KERN_DEBUG "Force enabled HPET at resume\n");
else
BUG();
}
static void vt8237_force_enable_hpet(struct pci_dev *dev)
{
u32 uninitialized_var(val);
if (!hpet_force_user || hpet_address || force_hpet_address)
return;
pci_read_config_dword(dev, 0x68, &val);
/*
* Bit 7 is HPET enable bit.
* Bit 31:10 is HPET base address (contrary to what datasheet claims)
*/
if (val & 0x80) {
force_hpet_address = (val & ~0x3ff);
dev_printk(KERN_DEBUG, &dev->dev, "HPET at 0x%lx\n",
force_hpet_address);
return;
}
/*
* HPET is disabled. Trying enabling at FED00000 and check
* whether it sticks
*/
val = 0xfed00000 | 0x80;
pci_write_config_dword(dev, 0x68, val);
pci_read_config_dword(dev, 0x68, &val);
if (val & 0x80) {
force_hpet_address = (val & ~0x3ff);
dev_printk(KERN_DEBUG, &dev->dev, "Force enabled HPET at "
"0x%lx\n", force_hpet_address);
cached_dev = dev;
force_hpet_resume_type = VT8237_FORCE_HPET_RESUME;
return;
}
dev_printk(KERN_DEBUG, &dev->dev, "Failed to force enable HPET\n");
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8235,
vt8237_force_enable_hpet);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8237,
vt8237_force_enable_hpet);
/*
* Undocumented chipset feature taken from LinuxBIOS.
*/
static void nvidia_force_hpet_resume(void)
{
pci_write_config_dword(cached_dev, 0x44, 0xfed00001);
printk(KERN_DEBUG "Force enabled HPET at resume\n");
}
static void nvidia_force_enable_hpet(struct pci_dev *dev)
{
u32 uninitialized_var(val);
if (!hpet_force_user || hpet_address || force_hpet_address)
return;
pci_write_config_dword(dev, 0x44, 0xfed00001);
pci_read_config_dword(dev, 0x44, &val);
force_hpet_address = val & 0xfffffffe;
force_hpet_resume_type = NVIDIA_FORCE_HPET_RESUME;
dev_printk(KERN_DEBUG, &dev->dev, "Force enabled HPET at 0x%lx\n",
force_hpet_address);
cached_dev = dev;
return;
}
/* ISA Bridges */
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0050,
nvidia_force_enable_hpet);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0051,
nvidia_force_enable_hpet);
/* LPC bridges */
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0260,
nvidia_force_enable_hpet);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0360,
nvidia_force_enable_hpet);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0361,
nvidia_force_enable_hpet);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0362,
nvidia_force_enable_hpet);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0363,
nvidia_force_enable_hpet);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0364,
nvidia_force_enable_hpet);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0365,
nvidia_force_enable_hpet);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0366,
nvidia_force_enable_hpet);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0367,
nvidia_force_enable_hpet);
void force_hpet_resume(void)
{
switch (force_hpet_resume_type) {
case ICH_FORCE_HPET_RESUME:
ich_force_hpet_resume();
return;
case OLD_ICH_FORCE_HPET_RESUME:
old_ich_force_hpet_resume();
return;
case VT8237_FORCE_HPET_RESUME:
vt8237_force_hpet_resume();
return;
case NVIDIA_FORCE_HPET_RESUME:
nvidia_force_hpet_resume();
return;
default:
break;
}
}
#endif
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