We hardcode highmemory size in every northbridge! This is bad, and especially if...
[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 #include <cbmem.h>
58 #endif
59 static void pci_domain_set_resources(device_t dev)
60 {
61         device_t mc_dev;
62         uint32_t pci_tolm;
63
64         printk(BIOS_DEBUG, "Entered with dev vid = %x\n", dev->vendor);
65         printk(BIOS_DEBUG, "Entered with dev did = %x\n", dev->device);
66
67         pci_tolm = find_pci_tolm(dev->link_list);
68         mc_dev = dev->link_list->children->sibling;
69         printk(BIOS_DEBUG, "MC dev vendor = %x\n", mc_dev->vendor);
70         printk(BIOS_DEBUG, "MC dev device = %x\n", mc_dev->device);
71
72         if (mc_dev) {
73                 /* Figure out which areas are/should be occupied by RAM.
74                  * This is all computed in kilobytes and converted to/from
75                  * the memory controller right at the edges.
76                  * Having different variables in different units is
77                  * too confusing to get right.  Kilobytes are good up to
78                  * 4 Terabytes of RAM...
79                  */
80                 unsigned long tomk, tolmk;
81                 int idx;
82
83                 /* Get the value of the highest DRB. This tells the end of
84                  * the physical memory.  The units are ticks of 32MB
85                  * i.e. 1 means 32MB.
86                  */
87                 tomk = (unsigned long)pci_read_config8(mc_dev, 0x43);
88                 tomk = tomk * 32 * 1024;
89                 /* add vga_mem detection */
90                 tomk = tomk - 16 * 1024;
91                 /* Compute the top of Low memory */
92                 tolmk = pci_tolm >> 10;
93                 if (tolmk >= tomk) {
94                         /* The PCI hole does not overlap memory
95                          */
96                         tolmk = tomk;
97                 }
98                 /* Write the ram configuration registers,
99                  * preserving the reserved bits.
100                  */
101
102                 /* Report the memory regions */
103                 printk(BIOS_DEBUG, "tomk = %ld\n", tomk);
104                 printk(BIOS_DEBUG, "tolmk = %ld\n", tolmk);
105
106                 idx = 10;
107                 /* avoid pam region */
108                 ram_resource(dev, idx++, 0, 640);
109                 /* ram_resource(dev, idx++, 1024, tolmk - 1024); */
110                 ram_resource(dev, idx++, 768, tolmk - 768);
111
112 #if CONFIG_WRITE_HIGH_TABLES==1
113                 /* Leave some space for ACPI, PIRQ and MP tables */
114                 high_tables_base = (tomk * 1024) - HIGH_MEMORY_SIZE;
115                 high_tables_size = HIGH_MEMORY_SIZE;
116 #endif
117         }
118         assign_resources(dev->link_list);
119 }
120
121 static struct device_operations pci_domain_ops = {
122         .read_resources   = pci_domain_read_resources,
123         .set_resources    = pci_domain_set_resources,
124         .enable_resources = NULL,
125         .init             = NULL,
126         .scan_bus         = pci_domain_scan_bus,
127 };
128
129 static void cpu_bus_init(device_t dev)
130 {
131         initialize_cpus(dev->link_list);
132 }
133
134 static void cpu_bus_noop(device_t dev)
135 {
136 }
137
138 static struct device_operations cpu_bus_ops = {
139         .read_resources   = cpu_bus_noop,
140         .set_resources    = cpu_bus_noop,
141         .enable_resources = cpu_bus_noop,
142         .init             = cpu_bus_init,
143         .scan_bus         = 0,
144 };
145
146 static void enable_dev(struct device *dev)
147 {
148         /* Set the operations if it is a special bus type */
149         if (dev->path.type == DEVICE_PATH_PCI_DOMAIN) {
150                 dev->ops = &pci_domain_ops;
151                 pci_set_method(dev);
152         }
153         else if (dev->path.type == DEVICE_PATH_APIC_CLUSTER) {
154                 dev->ops = &cpu_bus_ops;
155         }
156 }
157
158 struct chip_operations northbridge_intel_i855_ops = {
159         CHIP_NAME("Intel 855 Northbridge")
160         .enable_dev = enable_dev,
161 };