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x86/PCI: Detect mmconfig on nVidia MCP55 

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.

Signed-off-by: Ed Swierk <eswierk@aristanetworks.com>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Ed Swierk 2009-03-19 20:57:56 -07:00 committed by Jesse Barnes
parent 15b49bee3a
commit 5546d6f568
1 changed files with 64 additions and 0 deletions
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64
arch/x86/pci/mmconfig-shared.c
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@ -154,6 +154,68 @@ static const char __init *pci_mmcfg_amd_fam10h(void)
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;
@ -171,6 +233,8 @@ static struct pci_mmcfg_hostbridge_probe pci_mmcfg_probes[] __initdata = {
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 pci_mmcfg_check_hostbridge(void)