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Diffstat (limited to 'arch/x86/pci/broadcom_bus.c')
-rw-r--r--arch/x86/pci/broadcom_bus.c112
1 files changed, 112 insertions, 0 deletions
diff --git a/arch/x86/pci/broadcom_bus.c b/arch/x86/pci/broadcom_bus.c
new file mode 100644
index 0000000000..2db73613ca
--- /dev/null
+++ b/arch/x86/pci/broadcom_bus.c
@@ -0,0 +1,112 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Read address ranges from a Broadcom CNB20LE Host Bridge
+ *
+ * Copyright (c) 2010 Ira W. Snyder <iws@ovro.caltech.edu>
+ */
+
+#include <linux/acpi.h>
+#include <linux/delay.h>
+#include <linux/dmi.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <asm/pci_x86.h>
+#include <asm/pci-direct.h>
+
+#include "bus_numa.h"
+
+static void __init cnb20le_res(u8 bus, u8 slot, u8 func)
+{
+ struct pci_root_info *info;
+ struct pci_root_res *root_res;
+ struct resource res;
+ u16 word1, word2;
+ u8 fbus, lbus;
+
+ /* read the PCI bus numbers */
+ fbus = read_pci_config_byte(bus, slot, func, 0x44);
+ lbus = read_pci_config_byte(bus, slot, func, 0x45);
+ info = alloc_pci_root_info(fbus, lbus, 0, 0);
+
+ /*
+ * 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 */
+ word1 = read_pci_config_16(bus, slot, func, 0xc0);
+ word2 = read_pci_config_16(bus, slot, func, 0xc2);
+ if (word1 != word2) {
+ res.start = ((resource_size_t) word1 << 16) | 0x0000;
+ res.end = ((resource_size_t) word2 << 16) | 0xffff;
+ res.flags = IORESOURCE_MEM;
+ update_res(info, res.start, res.end, res.flags, 0);
+ }
+
+ /* read the prefetchable memory window */
+ word1 = read_pci_config_16(bus, slot, func, 0xc4);
+ word2 = read_pci_config_16(bus, slot, func, 0xc6);
+ if (word1 != word2) {
+ res.start = ((resource_size_t) word1 << 16) | 0x0000;
+ res.end = ((resource_size_t) word2 << 16) | 0xffff;
+ res.flags = IORESOURCE_MEM | IORESOURCE_PREFETCH;
+ update_res(info, res.start, res.end, res.flags, 0);
+ }
+
+ /* read the IO port window */
+ word1 = read_pci_config_16(bus, slot, func, 0xd0);
+ word2 = read_pci_config_16(bus, slot, func, 0xd2);
+ 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;
+ printk(KERN_INFO "CNB20LE PCI Host Bridge (domain 0000 %pR)\n", &res);
+
+ list_for_each_entry(root_res, &info->resources, list)
+ printk(KERN_INFO "host bridge window %pR\n", &root_res->res);
+}
+
+static int __init broadcom_postcore_init(void)
+{
+ u8 bus = 0, slot = 0;
+ u32 id;
+ u16 vendor, device;
+
+#ifdef CONFIG_ACPI
+ /*
+ * We should get host bridge information from ACPI unless the BIOS
+ * doesn't support it.
+ */
+ if (!acpi_disabled && acpi_os_get_root_pointer())
+ return 0;
+#endif
+
+ id = read_pci_config(bus, slot, 0, PCI_VENDOR_ID);
+ vendor = id & 0xffff;
+ device = (id >> 16) & 0xffff;
+
+ if (vendor == PCI_VENDOR_ID_SERVERWORKS &&
+ device == PCI_DEVICE_ID_SERVERWORKS_LE) {
+ cnb20le_res(bus, slot, 0);
+ cnb20le_res(bus, slot, 1);
+ }
+ return 0;
+}
+
+postcore_initcall(broadcom_postcore_init);