3 files changed, 111 insertions, 0 deletions

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 9458685902bd..677b87d60a36 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1931,6 +1931,14 @@ config PCI_MMCONFIG
         bool "Support mmconfig PCI config space access"
         depends on X86_64 && PCI && ACPI
 
+config PCI_CNB20LE_QUIRK
+        bool "Read CNB20LE Host Bridge Windows"
+        depends on PCI
+        help
+          Read the PCI windows out of the CNB20LE host bridge. This allows
+          PCI hotplug to work on systems with the CNB20LE chipset which do
+          not have ACPI.
+
 config DMAR
         bool "Support for DMA Remapping Devices (EXPERIMENTAL)"
         depends on PCI_MSI && ACPI && EXPERIMENTAL
diff --git a/arch/x86/pci/Makefile b/arch/x86/pci/Makefile
index b110d97fb925..a0207a7fdf39 100644
--- a/arch/x86/pci/Makefile
+++ b/arch/x86/pci/Makefile
@@ -18,6 +18,8 @@ obj-$(CONFIG_X86_MRST)		+= mrst.o
 obj-y                           += common.o early.o
 obj-y                           += amd_bus.o bus_numa.o
 
+obj-$(CONFIG_PCI_CNB20LE_QUIRK) += broadcom_bus.o
+
 ifeq ($(CONFIG_PCI_DEBUG),y)
 EXTRA_CFLAGS += -DDEBUG
 endif
diff --git a/arch/x86/pci/broadcom_bus.c b/arch/x86/pci/broadcom_bus.c
new file mode 100644
index 000000000000..0846a5bbbfbd
--- /dev/null
+++ b/arch/x86/pci/broadcom_bus.c
@@ -0,0 +1,101 @@
+/*
+ * Read address ranges from a Broadcom CNB20LE Host Bridge
+ *
+ * Copyright (c) 2010 Ira W. Snyder <iws@ovro.caltech.edu>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/delay.h>
+#include <linux/dmi.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <asm/pci_x86.h>
+
+#include "bus_numa.h"
+
+static void __devinit cnb20le_res(struct pci_dev *dev)
+{
+        struct pci_root_info *info;
+        struct resource res;
+        u16 word1, word2;
+        u8 fbus, lbus;
+        int i;
+
+        /*
+         * The x86_pci_root_bus_res_quirks() function already refuses to use
+         * this information if ACPI _CRS was used. Therefore, we don't bother
+         * checking if ACPI is enabled, and just generate the information
+         * for both the ACPI _CRS and no ACPI cases.
+         */
+
+        info = &pci_root_info[pci_root_num];
+        pci_root_num++;
+
+        /* read the PCI bus numbers */
+        pci_read_config_byte(dev, 0x44, &fbus);
+        pci_read_config_byte(dev, 0x45, &lbus);
+        info->bus_min = fbus;
+        info->bus_max = lbus;
+
+        /*
+         * Add the legacy IDE ports on bus 0
+         *
+         * These do not exist anywhere in the bridge registers, AFAICT. I do
+         * not have the datasheet, so this is the best I can do.
+         */
+        if (fbus == 0) {
+                update_res(info, 0x01f0, 0x01f7, IORESOURCE_IO, 0);
+                update_res(info, 0x03f6, 0x03f6, IORESOURCE_IO, 0);
+                update_res(info, 0x0170, 0x0177, IORESOURCE_IO, 0);
+                update_res(info, 0x0376, 0x0376, IORESOURCE_IO, 0);
+                update_res(info, 0xffa0, 0xffaf, IORESOURCE_IO, 0);
+        }
+
+        /* read the non-prefetchable memory window */
+        pci_read_config_word(dev, 0xc0, &word1);
+        pci_read_config_word(dev, 0xc2, &word2);
+        if (word1 != word2) {
+                res.start = (word1 << 16) | 0x0000;
+                res.end   = (word2 << 16) | 0xffff;
+                res.flags = IORESOURCE_MEM;
+                update_res(info, res.start, res.end, res.flags, 0);
+        }
+
+        /* read the prefetchable memory window */
+        pci_read_config_word(dev, 0xc4, &word1);
+        pci_read_config_word(dev, 0xc6, &word2);
+        if (word1 != word2) {
+                res.start = (word1 << 16) | 0x0000;
+                res.end   = (word2 << 16) | 0xffff;
+                res.flags = IORESOURCE_MEM | IORESOURCE_PREFETCH;
+                update_res(info, res.start, res.end, res.flags, 0);
+        }
+
+        /* read the IO port window */
+        pci_read_config_word(dev, 0xd0, &word1);
+        pci_read_config_word(dev, 0xd2, &word2);
+        if (word1 != word2) {
+                res.start = word1;
+                res.end   = word2;
+                res.flags = IORESOURCE_IO;
+                update_res(info, res.start, res.end, res.flags, 0);
+        }
+
+        /* print information about this host bridge */
+        res.start = fbus;
+        res.end   = lbus;
+        res.flags = IORESOURCE_BUS;
+        dev_info(&dev->dev, "CNB20LE PCI Host Bridge (domain %04x %pR)\n",
+                            pci_domain_nr(dev->bus), &res);
+
+        for (i = 0; i < info->res_num; i++)
+                dev_info(&dev->dev, "host bridge window %pR\n", &info->res[i]);
+}
+
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_LE,
+                        cnb20le_res);
+