From: Conrad Kostecki <ck@conrad-kostecki.de>
To: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "x86@kernel.org" <x86@kernel.org>
CC: "tglx@linutronix.de" <tglx@linutronix.de>,
        "mingo@redhat.com" <mingo@redhat.com>, "hpa@zytor.com" <hpa@zytor.com>
Subject: [PATCH] x86: HPET force enable for Soekris net6501
Thread-Topic: [PATCH] x86: HPET force enable for Soekris net6501
Thread-Index: AQHPKW68eF3VOEekGkmzriEhDKIWtg==
Date: Fri, 14 Feb 2014 10:23:45 +0000
Message-ID: <4729ad4b8d3342c1b0e29fefe4b04d6a@DB4PR04MB265.eurprd04.prod.outlook.com>
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Hello,
as the Soekris net6501 does 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, slightly modified by me.
-> http://www.mail-archive.com/soekris-tech@lists.soekris.com/msg06462.html

Cheers
Conrad

Signed-off-by: Peter Neubauer <pneubauer@bluerwhite.org>
Signed-off-by: Conrad Kostecki <ck@conrad-kostecki.de>

--- a/arch/x86/kernel/quirks.c	2014-02-14 11:13:27.703432732 +0100
+++ b/arch/x86/kernel/quirks.c	2014-02-14 11:14:32.327496474 +0100
@@ -498,6 +498,25 @@ void force_hpet_resume(void)
 }
 
 /*
+ * Soekris net6501, based on Atom E6xx series, does not have ACPI.
+ * HPET should be force enabled on such platforms.
+ */
+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
--- a/include/linux/pci_ids.h	2014-02-14 11:13:00.575408953 +0100
+++ b/include/linux/pci_ids.h	2014-02-14 11:13:37.819442066 +0100
@@ -2854,6 +2854,7 @@
 #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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