linux-kernel - [PATCH] support PCI MCFG space on Intel i915 bridges

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Message-Id: <200704261227.25575.jesse.barnes@intel.com>
Date:	Thu, 26 Apr 2007 12:27:24 -0700
From:	Jesse Barnes <jesse.barnes@...el.com>
To:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Olivier Galibert <galibert@...ox.com>, Andi Kleen <ak@...e.de>,
	Greg KH <greg@...ah.com>
Subject: [PATCH] support PCI MCFG space on Intel i915 bridges

Add support for Intel 915 bridge chips to the new PCI MMConfig detection
code.  Tested and works on my sole 915 based platform (a Toshiba laptop).  I
added register masking per Oliver's suggestion, and moved the __init
qualifier to after the 'static const char' to match Ogawa-san's recent
cleanup patches.

Signed-off-by:  Jesse Barnes <jesse.barnes@...el.com>

diff --git a/arch/i386/pci/mmconfig-shared.c b/arch/i386/pci/mmconfig-shared.c
index 747d8c6..1339d31 100644
--- a/arch/i386/pci/mmconfig-shared.c
+++ b/arch/i386/pci/mmconfig-shared.c
@@ -72,6 +72,26 @@ static const char __init *pci_mmcfg_e7520(void)
 	return "Intel Corporation E7520 Memory Controller Hub";
 }
 
+static const char __init *pci_mmcfg_intel_915(void)
+{
+       u32 pciexbar, len = 0;
+
+       pci_conf1_read(0, 0, PCI_DEVFN(0,0), 0x48, 4, &pciexbar);
+
+       /* No enable bit or size field, so assume 256M range is enabled. */
+       len = 0x10000000U;
+       pci_mmcfg_config_num = 1;
+       pciexbar &= 0xe0000000; /* mask out potentially bogus bits */
+
+       pci_mmcfg_config = kzalloc(sizeof(pci_mmcfg_config[0]), GFP_KERNEL);
+       pci_mmcfg_config[0].address = pciexbar;
+       pci_mmcfg_config[0].pci_segment = 0;
+       pci_mmcfg_config[0].start_bus_number = 0;
+       pci_mmcfg_config[0].end_bus_number = (len >> 20) - 1;
+
+       return "Intel Corporation 915PM/GM/GMS Express Memory Controller Hub";
+}
+
 static const char __init *pci_mmcfg_intel_945(void)
 {
 	u32 pciexbar, mask = 0, len = 0;
@@ -129,6 +149,7 @@ struct pci_mmcfg_hostbridge_probe {
 
 static struct pci_mmcfg_hostbridge_probe pci_mmcfg_probes[] __initdata = {
 	{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_E7520_MCH, pci_mmcfg_e7520 },
+	{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82915GM_HB, pci_mmcfg_intel_915 },
 	{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82945G_HB, pci_mmcfg_intel_945 },
 };
 
-
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