2 * This file is part of the LinuxBIOS project.
4 * Copyright (C) 2007 Corey Osgood <corey@slightlyhackish.com>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
21 #include <console/console.h>
24 #include <device/device.h>
25 #include <device/pci.h>
26 #include <device/pci_ids.h>
31 #include "northbridge.h"
34 static void northbridge_init(device_t dev)
36 printk_spew("Northbridge init\n");
39 static struct device_operations northbridge_operations = {
40 .read_resources = pci_dev_read_resources,
41 .set_resources = pci_dev_set_resources,
42 .enable_resources = pci_dev_enable_resources,
43 .init = northbridge_init,
48 static const struct pci_driver northbridge_driver __pci_driver = {
49 .ops = &northbridge_operations,
50 .vendor = PCI_VENDOR_ID_INTEL,
54 #define BRIDGE_IO_MASK (IORESOURCE_IO | IORESOURCE_MEM)
56 static void pci_domain_read_resources(device_t dev)
58 struct resource *resource;
61 /* Initialize the system wide io space constraints */
62 resource = new_resource(dev, IOINDEX_SUBTRACTIVE(0, 0));
63 resource->base = 0x400;
64 resource->limit = 0xffffUL;
66 IORESOURCE_IO | IORESOURCE_SUBTRACTIVE | IORESOURCE_ASSIGNED;
68 /* Initialize the system wide memory resources constraints */
69 resource = new_resource(dev, IOINDEX_SUBTRACTIVE(1, 0));
70 resource->limit = 0xffffffffULL;
72 IORESOURCE_MEM | IORESOURCE_SUBTRACTIVE | IORESOURCE_ASSIGNED;
75 static void ram_resource(device_t dev, unsigned long index,
76 unsigned long basek, unsigned long sizek)
78 struct resource *resource;
83 resource = new_resource(dev, index);
84 resource->base = ((resource_t) basek) << 10;
85 resource->size = ((resource_t) sizek) << 10;
86 resource->flags = IORESOURCE_MEM | IORESOURCE_CACHEABLE |
87 IORESOURCE_FIXED | IORESOURCE_STORED | IORESOURCE_ASSIGNED;
90 static void tolm_test(void *gp, struct device *dev, struct resource *new)
92 struct resource **best_p = gp;
93 struct resource *best;
95 if (!best || (best->base > new->base)) {
101 static uint32_t find_pci_tolm(struct bus *bus)
103 struct resource *min;
106 search_bus_resources(bus, IORESOURCE_MEM, IORESOURCE_MEM, tolm_test,
109 if (min && tolm > min->base) {
115 /* Table which returns the RAM size in MB when fed the DRP[7:4] or [3:0] value.
116 * Note that 2 is a value which the DRP should never be programmed to.
117 * Some size values appear twice, due to single-sided vs dual-sided banks.
119 static int translate_i82810_to_mb[] = {
120 /* DRP 0 1 (2) 3 4 5 6 7 8 9 A B C D E F */
121 /* MB */0, 8, 0, 16, 16, 24, 32, 32, 48, 64, 64, 96, 128, 128, 192, 256,
124 static void pci_domain_set_resources(device_t dev)
129 pci_tolm = find_pci_tolm(&dev->link[0]);
130 mc_dev = dev->link[0].children;
133 /* Figure out which areas are/should be occupied by RAM.
134 * This is all computed in kilobytes and converted to/from
135 * the memory controller right at the edges.
136 * Having different variables in different units is
137 * too confusing to get right. Kilobytes are good up to
138 * 4 Terabytes of RAM...
140 unsigned long tomk, tolmk;
144 /* First get the value for DIMM 0. */
145 drp_value = pci_read_config8(mc_dev, DRP);
146 /* Translate it to MB and add to tomk. */
147 tomk = (unsigned long)(translate_i82810_to_mb[drp_value & 0xf]);
148 /* Now do the same for DIMM 1. */
149 drp_value = drp_value >> 4; // >>= 4; //? mess with later
150 tomk += (unsigned long)(translate_i82810_to_mb[drp_value]);
152 printk_debug("Setting RAM size to %d MB\n", tomk);
154 /* Convert tomk from MB to KB. */
157 /* Compute the top of Low memory. */
158 tolmk = pci_tolm >> 10;
160 /* The PCI hole does does not overlap the memory. */
164 /* Report the memory regions. */
166 ram_resource(dev, idx++, 0, 640);
167 ram_resource(dev, idx++, 1024, tolmk - 1024);
169 assign_resources(&dev->link[0]);
172 static unsigned int pci_domain_scan_bus(device_t dev, unsigned int max)
174 max = pci_scan_bus(&dev->link[0], PCI_DEVFN(0, 0), 0xff, max);
178 static struct device_operations pci_domain_ops = {
179 .read_resources = pci_domain_read_resources,
180 .set_resources = pci_domain_set_resources,
181 .enable_resources = enable_childrens_resources,
183 .scan_bus = pci_domain_scan_bus,
186 static void cpu_bus_init(device_t dev)
188 initialize_cpus(&dev->link[0]);
191 static void cpu_bus_noop(device_t dev)
195 static struct device_operations cpu_bus_ops = {
196 .read_resources = cpu_bus_noop,
197 .set_resources = cpu_bus_noop,
198 .enable_resources = cpu_bus_noop,
199 .init = cpu_bus_init,
203 static void enable_dev(struct device *dev)
205 struct device_path path;
207 /* Set the operations if it is a special bus type */
208 if (dev->path.type == DEVICE_PATH_PCI_DOMAIN) {
209 dev->ops = &pci_domain_ops;
211 } else if (dev->path.type == DEVICE_PATH_APIC_CLUSTER) {
212 dev->ops = &cpu_bus_ops;
216 struct chip_operations northbridge_intel_i82810_ops = {
217 CHIP_NAME("Intel 82810 Northbridge")
218 .enable_dev = enable_dev,