linux-kernel - [PATCH 4/7] disable broadcomm legacy boot interrupt generation

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Date:	Mon,  2 Jun 2008 14:45:04 +0200
From:	Olaf Dabrunz <od@...e.de>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Jon Masters <jonathan@...masters.org>,
	linux-kernel@...r.kernel.org, Olaf Dabrunz <od@...e.de>,
	Stefan Assmann <sassmann@...e.de>
Subject: [PATCH 4/7] disable broadcomm legacy boot interrupt generation

From: Olaf Dabrunz <od@...e.de>

Add a quirk to disable legacy boot interrupt generation on broadcomm HT1000.

Signed-off-by: Olaf Dabrunz <od@...e.de>
Signed-off-by: Stefan Assmann <sassmann@...e.de>
---
 drivers/pci/quirks.c |   30 ++++++++++++++++++++++++++++++
 1 files changed, 30 insertions(+), 0 deletions(-)

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 8f09f8f..e2fed6c 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -1377,6 +1377,36 @@ int nobootirqquirk_setup(char *str)
 __setup("nobootirqquirk", nobootirqquirk_setup);
 
 /*
+ * disabled boot interrupts on HT-1000
+ */
+static void quirk_disable_broadcom_boot_interrupt(struct pci_dev *dev)
+{
+	u32 feature_enable;
+	u32 saved_feature_enable;
+	u8 irq;
+
+	if (nobootirqquirk)
+		return;
+
+	pci_read_config_dword(dev, 0x64,
+		       &feature_enable);
+	saved_feature_enable = feature_enable;
+	feature_enable |= (1<<0);
+	pci_write_config_dword(dev, 0x64, feature_enable);
+
+	for (irq = 0x10; irq < 0x10 + 32; irq++) {
+		outb(irq, 0xC00);
+		outb(0x00, 0xC01);
+	}
+
+	pci_write_config_dword(dev, 0x64, saved_feature_enable);
+
+	printk(KERN_INFO "disabled boot interrupts on PCI device 0x%04x:0x%04x\n",
+		       dev->vendor, dev->device);
+}
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_SERVERWORKS,   PCI_DEVICE_ID_SERVERWORKS_HT1000SB, 	quirk_disable_broadcom_boot_interrupt);
+
+/*
  * On some chipsets we can disable the generation of legacy INTx boot
  * interrupts.
  */
-- 
1.5.2.4

-- 
Olaf Dabrunz (od/odabrunz), SUSE Linux Products GmbH, Nürnberg

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