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authorOlivier Galibert <galibert@pobox.com>2007-02-13 13:26:20 +0100
committerAndi Kleen <andi@basil.nowhere.org>2007-02-13 13:26:20 +0100
commit9358c693c5ac1afde28f24ac651f7903d32a850c (patch)
treeadd51939771569d41a44e9e7b48633b8037ded45 /arch/i386/pci
parent5f027387bbdb5a4a4c1babd557fd976cd09d7495 (diff)
[PATCH] mmconfig: Detect and support the E7520 and the 945G/GZ/P/PL
It seems that the only way to reliably support mmconfig in the presence of funky biosen is to detect the hostbridge and read where the window is mapped from its registers. Do that for the E7520 and the 945G/GZ/P/PL for a start. Signed-off-by: Olivier Galibert <galibert@pobox.com> Signed-off-by: Andi Kleen <ak@suse.de> Cc: Andi Kleen <ak@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org>
Diffstat (limited to 'arch/i386/pci')
-rw-r--r--arch/i386/pci/mmconfig-shared.c121
1 files changed, 119 insertions, 2 deletions
diff --git a/arch/i386/pci/mmconfig-shared.c b/arch/i386/pci/mmconfig-shared.c
index 779c987acc5..d72f0439147 100644
--- a/arch/i386/pci/mmconfig-shared.c
+++ b/arch/i386/pci/mmconfig-shared.c
@@ -3,6 +3,7 @@
* MMCONFIG - common code between i386 and x86-64.
*
* This code does:
+ * - known chipset handling
* - ACPI decoding and validation
*
* Per-architecture code takes care of the mappings and accesses
@@ -55,12 +56,128 @@ static __init void unreachable_devices(void)
}
}
+static __init const char *pci_mmcfg_e7520(void)
+{
+ u32 win;
+ pci_conf1_read(0, 0, PCI_DEVFN(0,0), 0xce, 2, &win);
+
+ pci_mmcfg_config_num = 1;
+ pci_mmcfg_config = kzalloc(sizeof(pci_mmcfg_config[0]), GFP_KERNEL);
+ if (!pci_mmcfg_config)
+ return NULL;
+ pci_mmcfg_config[0].address = (win & 0xf000) << 16;
+ pci_mmcfg_config[0].pci_segment = 0;
+ pci_mmcfg_config[0].start_bus_number = 0;
+ pci_mmcfg_config[0].end_bus_number = 255;
+
+ return "Intel Corporation E7520 Memory Controller Hub";
+}
+
+static __init const char *pci_mmcfg_intel_945(void)
+{
+ u32 pciexbar, mask = 0, len = 0;
+
+ pci_mmcfg_config_num = 1;
+
+ pci_conf1_read(0, 0, PCI_DEVFN(0,0), 0x48, 4, &pciexbar);
+
+ /* Enable bit */
+ if (!(pciexbar & 1))
+ pci_mmcfg_config_num = 0;
+
+ /* Size bits */
+ switch ((pciexbar >> 1) & 3) {
+ case 0:
+ mask = 0xf0000000U;
+ len = 0x10000000U;
+ break;
+ case 1:
+ mask = 0xf8000000U;
+ len = 0x08000000U;
+ break;
+ case 2:
+ mask = 0xfc000000U;
+ len = 0x04000000U;
+ break;
+ default:
+ pci_mmcfg_config_num = 0;
+ }
+
+ /* Errata #2, things break when not aligned on a 256Mb boundary */
+ /* Can only happen in 64M/128M mode */
+
+ if ((pciexbar & mask) & 0x0fffffffU)
+ pci_mmcfg_config_num = 0;
+
+ if (pci_mmcfg_config_num) {
+ pci_mmcfg_config = kzalloc(sizeof(pci_mmcfg_config[0]), GFP_KERNEL);
+ if (!pci_mmcfg_config)
+ return NULL;
+ pci_mmcfg_config[0].address = pciexbar & mask;
+ 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 945G/GZ/P/PL Express Memory Controller Hub";
+}
+
+struct pci_mmcfg_hostbridge_probe {
+ u32 vendor;
+ u32 device;
+ const char *(*probe)(void);
+};
+
+static __initdata struct pci_mmcfg_hostbridge_probe pci_mmcfg_probes[] = {
+ { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_E7520_MCH, pci_mmcfg_e7520 },
+ { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82945G_HB, pci_mmcfg_intel_945 },
+};
+
+static int __init pci_mmcfg_check_hostbridge(void)
+{
+ u32 l;
+ u16 vendor, device;
+ int i;
+ const char *name;
+
+ pci_conf1_read(0, 0, PCI_DEVFN(0,0), 0, 4, &l);
+ vendor = l & 0xffff;
+ device = (l >> 16) & 0xffff;
+
+ pci_mmcfg_config_num = 0;
+ pci_mmcfg_config = NULL;
+ name = NULL;
+
+ for (i = 0; !name && i < ARRAY_SIZE(pci_mmcfg_probes); i++)
+ if ((pci_mmcfg_probes[i].vendor == PCI_ANY_ID ||
+ pci_mmcfg_probes[i].vendor == vendor) &&
+ (pci_mmcfg_probes[i].device == PCI_ANY_ID ||
+ pci_mmcfg_probes[i].device == device))
+ name = pci_mmcfg_probes[i].probe();
+
+ if (name) {
+ if (pci_mmcfg_config_num)
+ printk(KERN_INFO "PCI: Found %s with MMCONFIG support.\n", name);
+ else
+ printk(KERN_INFO "PCI: Found %s without MMCONFIG support.\n",
+ name);
+ }
+
+ return name != NULL;
+}
+
void __init pci_mmcfg_init(int type)
{
+ int known_bridge = 0;
+
if ((pci_probe & PCI_PROBE_MMCONF) == 0)
return;
- acpi_table_parse(ACPI_SIG_MCFG, acpi_parse_mcfg);
+ if (type == 1 && pci_mmcfg_check_hostbridge())
+ known_bridge = 1;
+
+ if (!known_bridge)
+ acpi_table_parse(ACPI_SIG_MCFG, acpi_parse_mcfg);
if ((pci_mmcfg_config_num == 0) ||
(pci_mmcfg_config == NULL) ||
@@ -69,7 +186,7 @@ void __init pci_mmcfg_init(int type)
/* Only do this check when type 1 works. If it doesn't work
assume we run on a Mac and always use MCFG */
- if (type == 1 &&
+ if (type == 1 && !known_bridge &&
!e820_all_mapped(pci_mmcfg_config[0].address,
pci_mmcfg_config[0].address + MMCONFIG_APER_MIN,
E820_RESERVED)) {