Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 122 insertions, 0 deletions

diff --git a/arch/i386/pci/mmconfig.c b/arch/i386/pci/mmconfig.c
new file mode 100644
index 000000000000..021a50aa51f4
--- /dev/null
+++ b/arch/i386/pci/mmconfig.c
@@ -0,0 +1,122 @@
+/*
+ * Copyright (C) 2004 Matthew Wilcox <matthew@wil.cx>
+ * Copyright (C) 2004 Intel Corp.
+ *
+ * This code is released under the GNU General Public License version 2.
+ */
+
+/*
+ * mmconfig.c - Low-level direct PCI config space access via MMCONFIG
+ */
+
+#include <linux/pci.h>
+#include <linux/init.h>
+#include "pci.h"
+
+/* The physical address of the MMCONFIG aperture.  Set from ACPI tables. */
+u32 pci_mmcfg_base_addr;
+
+#define mmcfg_virt_addr ((void __iomem *) fix_to_virt(FIX_PCIE_MCFG))
+
+/* The base address of the last MMCONFIG device accessed */
+static u32 mmcfg_last_accessed_device;
+
+/*
+ * Functions for accessing PCI configuration space with MMCONFIG accesses
+ */
+
+static inline void pci_exp_set_dev_base(int bus, int devfn)
+{
+        u32 dev_base = pci_mmcfg_base_addr | (bus << 20) | (devfn << 12);
+        if (dev_base != mmcfg_last_accessed_device) {
+                mmcfg_last_accessed_device = dev_base;
+                set_fixmap_nocache(FIX_PCIE_MCFG, dev_base);
+        }
+}
+
+static int pci_mmcfg_read(unsigned int seg, unsigned int bus,
+                          unsigned int devfn, int reg, int len, u32 *value)
+{
+        unsigned long flags;
+
+        if (!value || (bus > 255) || (devfn > 255) || (reg > 4095))
+                return -EINVAL;
+
+        spin_lock_irqsave(&pci_config_lock, flags);
+
+        pci_exp_set_dev_base(bus, devfn);
+
+        switch (len) {
+        case 1:
+                *value = readb(mmcfg_virt_addr + reg);
+                break;
+        case 2:
+                *value = readw(mmcfg_virt_addr + reg);
+                break;
+        case 4:
+                *value = readl(mmcfg_virt_addr + reg);
+                break;
+        }
+
+        spin_unlock_irqrestore(&pci_config_lock, flags);
+
+        return 0;
+}
+
+static int pci_mmcfg_write(unsigned int seg, unsigned int bus,
+                           unsigned int devfn, int reg, int len, u32 value)
+{
+        unsigned long flags;
+
+        if ((bus > 255) || (devfn > 255) || (reg > 4095)) 
+                return -EINVAL;
+
+        spin_lock_irqsave(&pci_config_lock, flags);
+
+        pci_exp_set_dev_base(bus, devfn);
+
+        switch (len) {
+        case 1:
+                writeb(value, mmcfg_virt_addr + reg);
+                break;
+        case 2:
+                writew(value, mmcfg_virt_addr + reg);
+                break;
+        case 4:
+                writel(value, mmcfg_virt_addr + reg);
+                break;
+        }
+
+        spin_unlock_irqrestore(&pci_config_lock, flags);
+
+        return 0;
+}
+
+static struct pci_raw_ops pci_mmcfg = {
+        .read =         pci_mmcfg_read,
+        .write =        pci_mmcfg_write,
+};
+
+static int __init pci_mmcfg_init(void)
+{
+        if ((pci_probe & PCI_PROBE_MMCONF) == 0)
+                goto out;
+        if (!pci_mmcfg_base_addr)
+                goto out;
+
+        /* Kludge for now. Don't use mmconfig on AMD systems because
+           those have some busses where mmconfig doesn't work,
+           and we don't parse ACPI MCFG well enough to handle that. 
+           Remove when proper handling is added. */
+        if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD)
+                goto out; 
+
+        printk(KERN_INFO "PCI: Using MMCONFIG\n");
+        raw_pci_ops = &pci_mmcfg;
+        pci_probe = (pci_probe & ~PCI_PROBE_MASK) | PCI_PROBE_MMCONF;
+
+ out:
+        return 0;
+}
+
+arch_initcall(pci_mmcfg_init);