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authorIra W. Snyder <iws@ovro.caltech.edu>2010-04-01 11:43:30 -0700
committerJesse Barnes <jbarnes@virtuousgeek.org>2010-05-21 14:43:46 -0700
commit3f6ea84a3035cc0ef7488f8e93bc76766799e082 (patch)
tree30f714b86c1221e2e832f27e1d15c6c1803c8b95 /arch/x86/pci
parent3322340a9db2251ac9d09bc7b8d49e872298ae95 (diff)
downloadop-kernel-dev-3f6ea84a3035cc0ef7488f8e93bc76766799e082.zip
op-kernel-dev-3f6ea84a3035cc0ef7488f8e93bc76766799e082.tar.gz
PCI: read memory ranges out of Broadcom CNB20LE host bridge
Read the memory ranges behind the Broadcom CNB20LE host bridge out of the hardware. This allows PCI hotplugging to work, since we know which memory range to allocate PCI BAR's from. The x86 PCI code automatically prefers the ACPI _CRS information when it is available. In that case, this information is not used. Signed-off-by: Ira W. Snyder <iws@ovro.caltech.edu> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'arch/x86/pci')
-rw-r--r--arch/x86/pci/Makefile2
-rw-r--r--arch/x86/pci/broadcom_bus.c101
2 files changed, 103 insertions, 0 deletions
diff --git a/arch/x86/pci/Makefile b/arch/x86/pci/Makefile
index b110d97..a0207a7 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 0000000..0846a5b
--- /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);
+
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