1 /* 2 * Read address ranges from a Broadcom CNB20LE Host Bridge 3 * 4 * Copyright (c) 2010 Ira W. Snyder <iws@ovro.caltech.edu> 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License as published by the 8 * Free Software Foundation; either version 2 of the License, or (at your 9 * option) any later version. 10 */ 11 12 #include <linux/acpi.h> 13 #include <linux/delay.h> 14 #include <linux/dmi.h> 15 #include <linux/pci.h> 16 #include <linux/init.h> 17 #include <asm/pci_x86.h> 18 #include <asm/pci-direct.h> 19 20 #include "bus_numa.h" 21 22 static void __init cnb20le_res(u8 bus, u8 slot, u8 func) 23 { 24 struct pci_root_info *info; 25 struct pci_root_res *root_res; 26 struct resource res; 27 u16 word1, word2; 28 u8 fbus, lbus; 29 30 /* read the PCI bus numbers */ 31 fbus = read_pci_config_byte(bus, slot, func, 0x44); 32 lbus = read_pci_config_byte(bus, slot, func, 0x45); 33 info = alloc_pci_root_info(fbus, lbus, 0, 0); 34 35 /* 36 * Add the legacy IDE ports on bus 0 37 * 38 * These do not exist anywhere in the bridge registers, AFAICT. I do 39 * not have the datasheet, so this is the best I can do. 40 */ 41 if (fbus == 0) { 42 update_res(info, 0x01f0, 0x01f7, IORESOURCE_IO, 0); 43 update_res(info, 0x03f6, 0x03f6, IORESOURCE_IO, 0); 44 update_res(info, 0x0170, 0x0177, IORESOURCE_IO, 0); 45 update_res(info, 0x0376, 0x0376, IORESOURCE_IO, 0); 46 update_res(info, 0xffa0, 0xffaf, IORESOURCE_IO, 0); 47 } 48 49 /* read the non-prefetchable memory window */ 50 word1 = read_pci_config_16(bus, slot, func, 0xc0); 51 word2 = read_pci_config_16(bus, slot, func, 0xc2); 52 if (word1 != word2) { 53 res.start = (word1 << 16) | 0x0000; 54 res.end = (word2 << 16) | 0xffff; 55 res.flags = IORESOURCE_MEM; 56 update_res(info, res.start, res.end, res.flags, 0); 57 } 58 59 /* read the prefetchable memory window */ 60 word1 = read_pci_config_16(bus, slot, func, 0xc4); 61 word2 = read_pci_config_16(bus, slot, func, 0xc6); 62 if (word1 != word2) { 63 res.start = ((resource_size_t) word1 << 16) | 0x0000; 64 res.end = ((resource_size_t) word2 << 16) | 0xffff; 65 res.flags = IORESOURCE_MEM | IORESOURCE_PREFETCH; 66 update_res(info, res.start, res.end, res.flags, 0); 67 } 68 69 /* read the IO port window */ 70 word1 = read_pci_config_16(bus, slot, func, 0xd0); 71 word2 = read_pci_config_16(bus, slot, func, 0xd2); 72 if (word1 != word2) { 73 res.start = word1; 74 res.end = word2; 75 res.flags = IORESOURCE_IO; 76 update_res(info, res.start, res.end, res.flags, 0); 77 } 78 79 /* print information about this host bridge */ 80 res.start = fbus; 81 res.end = lbus; 82 res.flags = IORESOURCE_BUS; 83 printk(KERN_INFO "CNB20LE PCI Host Bridge (domain 0000 %pR)\n", &res); 84 85 list_for_each_entry(root_res, &info->resources, list) 86 printk(KERN_INFO "host bridge window %pR\n", &root_res->res); 87 } 88 89 static int __init broadcom_postcore_init(void) 90 { 91 u8 bus = 0, slot = 0; 92 u32 id; 93 u16 vendor, device; 94 95 #ifdef CONFIG_ACPI 96 /* 97 * We should get host bridge information from ACPI unless the BIOS 98 * doesn't support it. 99 */ 100 if (!acpi_disabled && acpi_os_get_root_pointer()) 101 return 0; 102 #endif 103 104 id = read_pci_config(bus, slot, 0, PCI_VENDOR_ID); 105 vendor = id & 0xffff; 106 device = (id >> 16) & 0xffff; 107 108 if (vendor == PCI_VENDOR_ID_SERVERWORKS && 109 device == PCI_DEVICE_ID_SERVERWORKS_LE) { 110 cnb20le_res(bus, slot, 0); 111 cnb20le_res(bus, slot, 1); 112 } 113 return 0; 114 } 115 116 postcore_initcall(broadcom_postcore_init); 117