diff options
Diffstat (limited to 'arch/x86/pci/broadcom_bus.c')
| -rw-r--r-- | arch/x86/pci/broadcom_bus.c | 112 |
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); |