linux-kernel - [PATCH] pci: Fix e100 interrupt quirk

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Message-ID: <20070919123649.GA3686@ru.mvista.com>
Date:	Wed, 19 Sep 2007 16:36:49 +0400
From:	Valentine Barshak <vbarshak@...mvista.com>
To:	linux-kernel@...r.kernel.org
Cc:	jarkao2@...pl
Subject: [PATCH] pci: Fix e100 interrupt quirk

PCI memory space may have a 64-bit offset on some architectures
(for example, PowerPC 440) and the actual PCI memory address
has to fixed up (an offset to PCI mem space shuld be added)
before remapping. So, pci_iomap should be used instead of
reading and remapping PCI BAR directly. This has been tested
on Sequoia PowerPC 440EPx board.

Signed-off-by: Valentine Barshak <vbarshak@...mvista.com>
---

diff -ruN linux-2.6.orig/drivers/pci/quirks.c linux-2.6/drivers/pci/quirks.c
--- linux-2.6.orig/drivers/pci/quirks.c	2007-09-18 15:32:48.000000000 +0400
+++ linux-2.6/drivers/pci/quirks.c	2007-09-19 15:57:26.000000000 +0400
@@ -1444,7 +1444,6 @@
 static void __devinit quirk_e100_interrupt(struct pci_dev *dev)
 {
 	u16 command;
-	u32 bar;
 	u8 __iomem *csr;
 	u8 cmd_hi;
 
@@ -1476,16 +1475,18 @@
 	 * re-enable them when it's ready.
 	 */
 	pci_read_config_word(dev, PCI_COMMAND, &command);
-	pci_read_config_dword(dev, PCI_BASE_ADDRESS_0, &bar);
 
-	if (!(command & PCI_COMMAND_MEMORY) || !bar)
+	if (!(command & PCI_COMMAND_MEMORY))
 		return;
 
-	csr = ioremap(bar, 8);
+	if (pci_request_region(dev, 0, "e100_quirk"))
+		return;
+
+	csr = pci_iomap(dev, 0, 8);
 	if (!csr) {
 		printk(KERN_WARNING "PCI: Can't map %s e100 registers\n",
 			pci_name(dev));
-		return;
+		goto e100_quirk_exit;
 	}
 
 	cmd_hi = readb(csr + 3);
@@ -1495,7 +1496,9 @@
 		writeb(1, csr + 3);
 	}
 
-	iounmap(csr);
+	pci_iounmap(dev, csr);
+e100_quirk_exit:
+	pci_release_region(dev, 0);
 }
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_ANY_ID, quirk_e100_interrupt);
 
-
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