From: Ed Swierk <eswierk@xxxxxxxxxxxxxxxxxx>
Detect and enable memory-mapped PCI configuration space on the nVidia
MCP55 southbridge. Tested against 2.6.27.4 on an Arista Networks
development board with one MCP55, Coreboot firmware, no ACPI.
v2: add multi mcp55 support, and conexist with amd quad core system by Yinghai
also only enable it only when acpi=off or acpi is not built-in
Signed-off-by: Ed Swierk <eswierk@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>
---
arch/x86/pci/mmconfig-shared.c | 64 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 64 insertions(+)
Index: linux-2.6/arch/x86/pci/mmconfig-shared.c
===================================================================
--- linux-2.6.orig/arch/x86/pci/mmconfig-shared.c
+++ linux-2.6/arch/x86/pci/mmconfig-shared.c
@@ -166,6 +166,68 @@ static const char __init *pci_mmcfg_amd_
return "AMD Family 10h NB";
}
+static bool __initdata mcp55_checked;
+static const char __init *pci_mmcfg_nvidia_mcp55(void)
+{
+ int bus;
+ int mcp55_mmconf_found = 0;
+
+ static const u32 extcfg_regnum = 0x90;
+ static const u32 extcfg_regsize = 4;
+ static const u32 extcfg_enable_mask = 1<<31;
+ static const u32 extcfg_start_mask = 0xff<<16;
+ static const int extcfg_start_shift = 16;
+ static const u32 extcfg_size_mask = 0x3<<28;
+ static const int extcfg_size_shift = 28;
+ static const int extcfg_sizebus[] = {0x100, 0x80, 0x40, 0x20};
+ static const u32 extcfg_base_mask[] = {0x7ff8, 0x7ffc, 0x7ffe, 0x7fff};
+ static const int extcfg_base_lshift = 25;
+
+ /*
+ * do check if amd fam10h already took over
+ */
+ if (!acpi_disabled || pci_mmcfg_config_num || mcp55_checked)
+ return NULL;
+
+ mcp55_checked = true;
+ for (bus = 0; bus < 256; bus++) {
+ u64 base;
+ u32 l, extcfg;
+ u16 vendor, device;
+ int start, size_index, end;
+
+ raw_pci_ops->read(0, bus, PCI_DEVFN(0, 0), 0, 4, &l);
+ vendor = l & 0xffff;
+ device = (l >> 16) & 0xffff;
+
+ if (PCI_VENDOR_ID_NVIDIA != vendor || 0x0369 != device)
+ continue;
+
+ raw_pci_ops->read(0, bus, PCI_DEVFN(0, 0), extcfg_regnum,
+ extcfg_regsize, &extcfg);
+
+ if (!(extcfg & extcfg_enable_mask))
+ continue;
+
+ if (extend_mmcfg(1) == -1)
+ continue;
+
+ size_index = (extcfg & extcfg_size_mask) >> extcfg_size_shift;
+ base = extcfg & extcfg_base_mask[size_index];
+ /* base could > 4G */
+ base <<= extcfg_base_lshift;
+ start = (extcfg & extcfg_start_mask) >> extcfg_start_shift;
+ end = start + extcfg_sizebus[size_index] - 1;
+ fill_one_mmcfg(base, 0, start, end);
+ mcp55_mmconf_found++;
+ }
+
+ if (!mcp55_mmconf_found)
+ return NULL;
+
+ return "nVidia MCP55";
+}
+
struct pci_mmcfg_hostbridge_probe {
u32 bus;
u32 devfn;
@@ -183,6 +245,8 @@ static struct pci_mmcfg_hostbridge_probe
0x1200, pci_mmcfg_amd_fam10h },
{ 0xff, PCI_DEVFN(0, 0), PCI_VENDOR_ID_AMD,
0x1200, pci_mmcfg_amd_fam10h },
+ { 0, PCI_DEVFN(0, 0), PCI_VENDOR_ID_NVIDIA,
+ 0x0369, pci_mmcfg_nvidia_mcp55 },
};
static int __init cmp_mmcfg(const void *x1, const void *x2)
--
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