Messages in this thread Patch in this message | | | Date | Fri, 12 Sep 2014 13:06:13 +0200 | From | Eric Sesterhenn <> | Subject | [PATCH] x86: HPET force enable for e6xx based systems |
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From: Peter Neubauer <pneubauer@bluerwhite.org>
as the Soekris net6501 and other e6xx based systems do not have any ACPI implementation, HPET won't get enabled. This patch enables HPET on such platforms.
[ 0.430149] pci 0000:00:01.0: Force enabled HPET at 0xfed00000 [ 0.644838] HPET: 3 timers in total, 0 timers will be used for per-cpu timer
Original patch by Peter Neubauer (http://www.mail-archive.com/soekris-tech@lists.soekris.com/msg06462.html) slightly modified by Conrad Kostecki <ck@conrad-kostecki.de> and massaged accoring to Thomas Gleixners <tglx@linutronix.de> by me.
Signed-off-by: Eric Sesterhenn <eric.sesterhenn@lsexperts.de>
--- I am not quite sure how to include Conrad in the tags and if the Suggested-by tag would be the right way to do this, therefore I have included him in the description. The patch is against Linux current git.
diff --git a/arch/x86/kernel/quirks.c b/arch/x86/kernel/quirks.c index ff898bb..176a0f9 100644 --- a/arch/x86/kernel/quirks.c +++ b/arch/x86/kernel/quirks.c @@ -498,6 +498,24 @@ void force_hpet_resume(void) }
/* + * According to the datasheet e6xx systems have the HPET hardwired to + * 0xfed00000 + */ +static void e6xx_force_enable_hpet(struct pci_dev *dev) +{ + if (hpet_address || force_hpet_address) + return; + + force_hpet_address = 0xFED00000; + force_hpet_resume_type = NONE_FORCE_HPET_RESUME; + dev_printk(KERN_DEBUG, &dev->dev, "Force enabled HPET at " + "0x%lx\n", force_hpet_address); + return; +} +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_E6XX_CU, + e6xx_force_enable_hpet); + +/* * HPET MSI on some boards (ATI SB700/SB800) has side effect on * floppy DMA. Disable HPET MSI on such platforms. * See erratum #27 (Misinterpreted MSI Requests May Result in diff --git a/include/linux/pci_ids.h b/include/linux/pci_ids.h index 6ed0bb7..aa0d390 100644 --- a/include/linux/pci_ids.h +++ b/include/linux/pci_ids.h @@ -2860,6 +2860,7 @@ #define PCI_DEVICE_ID_INTEL_82372FB_1 0x7601 #define PCI_DEVICE_ID_INTEL_SCH_LPC 0x8119 #define PCI_DEVICE_ID_INTEL_SCH_IDE 0x811a +#define PCI_DEVICE_ID_INTEL_E6XX_CU 0x8183 #define PCI_DEVICE_ID_INTEL_ITC_LPC 0x8186 #define PCI_DEVICE_ID_INTEL_82454GX 0x84c4 #define PCI_DEVICE_ID_INTEL_82450GX 0x84c5
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