1 #include <console/console.h>
4 #include <device/device.h>
5 #include <device/pci.h>
6 #include <device/pci_ids.h>
12 #define BRIDGE_IO_MASK (IORESOURCE_IO | IORESOURCE_MEM)
14 static void pci_domain_read_resources(device_t dev)
16 struct resource *resource;
18 /* Initialize the system wide io space constraints */
19 resource = new_resource(dev, IOINDEX_SUBTRACTIVE(0, 0));
20 resource->limit = 0xffffUL;
21 resource->flags = IORESOURCE_IO | IORESOURCE_SUBTRACTIVE | IORESOURCE_ASSIGNED;
23 /* Initialize the system wide memory resources constraints */
24 resource = new_resource(dev, IOINDEX_SUBTRACTIVE(1, 0));
25 resource->limit = 0xffffffffULL;
26 resource->flags = IORESOURCE_MEM | IORESOURCE_SUBTRACTIVE | IORESOURCE_ASSIGNED;
29 static void ram_resource(device_t dev, unsigned long index,
30 unsigned long basek, unsigned long sizek)
32 struct resource *resource;
37 resource = new_resource(dev, index);
38 resource->base = ((resource_t)basek) << 10;
39 resource->size = ((resource_t)sizek) << 10;
40 resource->flags = IORESOURCE_MEM | IORESOURCE_CACHEABLE | \
41 IORESOURCE_FIXED | IORESOURCE_STORED | IORESOURCE_ASSIGNED;
44 static void tolm_test(void *gp, struct device *dev, struct resource *new)
46 struct resource **best_p = gp;
47 struct resource *best;
49 if (!best || (best->base > new->base)) {
55 static uint32_t find_pci_tolm(struct bus *bus)
60 search_bus_resources(bus, IORESOURCE_MEM, IORESOURCE_MEM, tolm_test, &min);
62 if (min && tolm > min->base) {
68 static void pci_domain_set_resources(device_t dev)
73 pci_tolm = find_pci_tolm(&dev->link[0]);
74 mc_dev = dev->link[0].children;
76 /* Figure out which areas are/should be occupied by RAM.
77 * This is all computed in kilobytes and converted to/from
78 * the memory controller right at the edges.
79 * Having different variables in different units is
80 * too confusing to get right. Kilobytes are good up to
81 * 4 Terabytes of RAM...
84 unsigned long tomk, tolmk;
87 /* Get the value of the highest DRB. This tells the end of
88 * the physical memory. The units are ticks of 32MB
91 tomk = ((unsigned long)pci_read_config8(mc_dev, 0x63)) << 15;
92 /* Compute the top of Low memory */
93 tolmk = pci_tolm >> 10;
95 /* The PCI hole does does not overlap the memory.
99 /* Write the ram configuration registers,
100 * preserving the reserved bits.
102 tolm_r = pci_read_config16(mc_dev, 0xc4);
103 tolm_r = ((tolmk >> 10) << 3) | (tolm_r & 0xf);
104 pci_write_config16(mc_dev, 0xc4, tolm_r);
106 /* Report the memory regions */
108 ram_resource(dev, idx++, 0, 640);
109 ram_resource(dev, idx++, 768, tolmk - 768);
111 assign_resources(&dev->link[0]);
114 static unsigned int pci_domain_scan_bus(device_t dev, unsigned int max)
116 max = pci_scan_bus(&dev->link[0], PCI_DEVFN(0, 0), 0xff, max);
120 static struct device_operations pci_domain_ops = {
121 .read_resources = pci_domain_read_resources,
122 .set_resources = pci_domain_set_resources,
123 .enable_resources = enable_childrens_resources,
125 .scan_bus = pci_domain_scan_bus,
128 static void cpu_bus_init(device_t dev)
130 initialize_cpus(&dev->link[0]);
133 static void cpu_bus_noop(device_t dev)
137 static struct device_operations cpu_bus_ops = {
138 .read_resources = cpu_bus_noop,
139 .set_resources = cpu_bus_noop,
140 .enable_resources = cpu_bus_noop,
141 .init = cpu_bus_init,
145 static void enable_dev(struct device *dev)
147 struct device_path path;
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;
154 else if (dev->path.type == DEVICE_PATH_APIC_CLUSTER) {
155 dev->ops = &cpu_bus_ops;
159 struct chip_operations northbridge_intel_i855pm_ops = {
160 CHIP_NAME("Intel 855PM Northbridge")
161 .enable_dev = enable_dev,