Factor out a few commonly duplicated functions from northbridge.c.
[coreboot.git] / src / northbridge / intel / i855 / northbridge.c
1 /*
2  * This file is part of the coreboot project.
3  *
4  * Copyright (C) 2003 Ronald G. Minnich
5  * Copyright (C) 2003-2004 Eric W. Biederman
6  * Copyright (C) 2006 Jon Dufresne <jon.dufresne@gmail.com>
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License as published by
10  * the Free Software Foundation; either version 2 of the License, or
11  * (at your option) any later version.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  * GNU General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
21  */
22
23 #include <console/console.h>
24 #include <arch/io.h>
25 #include <stdint.h>
26 #include <device/device.h>
27 #include <device/pci.h>
28 #include <device/pci_ids.h>
29 #include <stdlib.h>
30 #include <string.h>
31 #include <bitops.h>
32 #include <cpu/x86/cache.h>
33 #include <cpu/cpu.h>
34 #include "chip.h"
35
36 static void northbridge_init(device_t dev)
37 {
38         printk(BIOS_SPEW, "Northbridge init\n");
39 }
40
41 static struct device_operations northbridge_operations = {
42         .read_resources = pci_dev_read_resources,
43         .set_resources = pci_dev_set_resources,
44         .enable_resources = pci_dev_enable_resources,
45         .init = northbridge_init,
46         .enable = 0,
47         .ops_pci = 0,
48 };
49
50 static const struct pci_driver northbridge_driver __pci_driver = {
51         .ops = &northbridge_operations,
52         .vendor = PCI_VENDOR_ID_INTEL,
53         .device = 0x3580,
54 };
55
56 #if CONFIG_WRITE_HIGH_TABLES==1
57 #define HIGH_TABLES_SIZE 64     // maximum size of high tables in KB
58 extern uint64_t high_tables_base, high_tables_size;
59 #endif
60 static void pci_domain_set_resources(device_t dev)
61 {
62         device_t mc_dev;
63         uint32_t pci_tolm;
64
65         printk(BIOS_DEBUG, "Entered with dev vid = %x\n", dev->vendor);
66         printk(BIOS_DEBUG, "Entered with dev did = %x\n", dev->device);
67
68         pci_tolm = find_pci_tolm(dev->link_list);
69         mc_dev = dev->link_list->children->sibling;
70         printk(BIOS_DEBUG, "MC dev vendor = %x\n", mc_dev->vendor);
71         printk(BIOS_DEBUG, "MC dev device = %x\n", mc_dev->device);
72
73         if (mc_dev) {
74                 /* Figure out which areas are/should be occupied by RAM.
75                  * This is all computed in kilobytes and converted to/from
76                  * the memory controller right at the edges.
77                  * Having different variables in different units is
78                  * too confusing to get right.  Kilobytes are good up to
79                  * 4 Terabytes of RAM...
80                  */
81                 unsigned long tomk, tolmk;
82                 int idx;
83
84                 /* Get the value of the highest DRB. This tells the end of
85                  * the physical memory.  The units are ticks of 32MB
86                  * i.e. 1 means 32MB.
87                  */
88                 tomk = (unsigned long)pci_read_config8(mc_dev, 0x43);
89                 tomk = tomk * 32 * 1024;
90                 /* add vga_mem detection */
91                 tomk = tomk - 16 * 1024;
92                 /* Compute the top of Low memory */
93                 tolmk = pci_tolm >> 10;
94                 if (tolmk >= tomk) {
95                         /* The PCI hole does not overlap memory
96                          */
97                         tolmk = tomk;
98                 }
99                 /* Write the ram configuration registers,
100                  * preserving the reserved bits.
101                  */
102
103                 /* Report the memory regions */
104                 printk(BIOS_DEBUG, "tomk = %ld\n", tomk);
105                 printk(BIOS_DEBUG, "tolmk = %ld\n", tolmk);
106
107                 idx = 10;
108                 /* avoid pam region */
109                 ram_resource(dev, idx++, 0, 640);
110                 /* ram_resource(dev, idx++, 1024, tolmk - 1024); */
111                 ram_resource(dev, idx++, 768, tolmk - 768);
112
113 #if CONFIG_WRITE_HIGH_TABLES==1
114                 /* Leave some space for ACPI, PIRQ and MP tables */
115                 high_tables_base = (tomk - HIGH_TABLES_SIZE) * 1024;
116                 high_tables_size = HIGH_TABLES_SIZE * 1024;
117 #endif
118         }
119         assign_resources(dev->link_list);
120 }
121
122 static struct device_operations pci_domain_ops = {
123         .read_resources   = pci_domain_read_resources,
124         .set_resources    = pci_domain_set_resources,
125         .enable_resources = NULL,
126         .init             = NULL,
127         .scan_bus         = pci_domain_scan_bus,
128 };
129
130 static void cpu_bus_init(device_t dev)
131 {
132         initialize_cpus(dev->link_list);
133 }
134
135 static void cpu_bus_noop(device_t dev)
136 {
137 }
138
139 static struct device_operations cpu_bus_ops = {
140         .read_resources   = cpu_bus_noop,
141         .set_resources    = cpu_bus_noop,
142         .enable_resources = cpu_bus_noop,
143         .init             = cpu_bus_init,
144         .scan_bus         = 0,
145 };
146
147 static void enable_dev(struct device *dev)
148 {
149         /* Set the operations if it is a special bus type */
150         if (dev->path.type == DEVICE_PATH_PCI_DOMAIN) {
151                 dev->ops = &pci_domain_ops;
152                 pci_set_method(dev);
153         }
154         else if (dev->path.type == DEVICE_PATH_APIC_CLUSTER) {
155                 dev->ops = &cpu_bus_ops;
156         }
157 }
158
159 struct chip_operations northbridge_intel_i855_ops = {
160         CHIP_NAME("Intel 855 Northbridge")
161         .enable_dev = enable_dev,
162 };