xref: /openbmc/linux/arch/x86/pci/broadcom_bus.c (revision ae213c44)
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 = ((resource_size_t) word1 << 16) | 0x0000;
54 		res.end   = ((resource_size_t) 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