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#include <console/console.h>
#include <arch/io.h>
#include <stdint.h>
#include <device/device.h>
#include <device/pci.h>
#include <cpu/cpu.h>
#include <stdlib.h>
#include <string.h>
#include <bitops.h>
#include "chip.h"
static void ram_resource(device_t dev, unsigned long index,
unsigned long basek, unsigned long sizek)
{
struct resource *resource;
if (!sizek) {
return;
}
resource = new_resource(dev, index);
resource->base = ((resource_t)basek) << 10;
resource->size = ((resource_t)sizek) << 10;
resource->flags = IORESOURCE_MEM | IORESOURCE_CACHEABLE | \
IORESOURCE_FIXED | IORESOURCE_STORED | IORESOURCE_ASSIGNED;
}
static void tolm_test(void *gp, struct device *dev, struct resource *new)
{
struct resource **best_p = gp;
struct resource *best;
best = *best_p;
if (!best || (best->base > new->base)) {
best = new;
}
*best_p = best;
}
static uint32_t find_pci_tolm(struct bus *bus)
{
struct resource *min;
uint32_t tolm;
min = 0;
search_bus_resources(bus, IORESOURCE_MEM, IORESOURCE_MEM, tolm_test, &min);
tolm = 0xffffffffUL;
if (min && tolm > min->base) {
tolm = min->base;
}
return tolm;
}
#if CONFIG_WRITE_HIGH_TABLES==1
#define HIGH_TABLES_SIZE 64 // maximum size of high tables in KB
extern uint64_t high_tables_base, high_tables_size;
#endif
static void pci_domain_set_resources(device_t dev)
{
device_t mc_dev;
uint32_t pci_tolm;
pci_tolm = find_pci_tolm(dev->link_list);
mc_dev = dev->link_list->children;
if (mc_dev) {
/* Figure out which areas are/should be occupied by RAM.
* This is all computed in kilobytes and converted to/from
* the memory controller right at the edges.
* Having different variables in different units is
* too confusing to get right. Kilobytes are good up to
* 4 Terabytes of RAM...
*/
uint16_t tolm_r, remapbase_r, remaplimit_r;
unsigned long tomk, tolmk;
unsigned long remapbasek, remaplimitk;
int idx;
/* Get the value of the highest DRB. This tells the end of
* the physical memory. The units are ticks of 64MB
* i.e. 1 means 64MB.
*/
tomk = ((unsigned long)pci_read_config8(mc_dev, 0x67)) << 16;
/* Compute the top of Low memory */
tolmk = pci_tolm >> 10;
if (tolmk >= tomk) {
/* The PCI hole does not overlap memory
* we won't use the remap window.
*/
tolmk = tomk;
remapbasek = 0x3ff << 16;
remaplimitk = 0 << 16;
}
else {
/* The PCI memory hole overlaps memory
* setup the remap window.
*/
/* Find the bottom of the remap window
* is it above 4G?
*/
remapbasek = 4*1024*1024;
if (tomk > remapbasek) {
remapbasek = tomk;
}
/* Find the limit of the remap window */
remaplimitk = (remapbasek + (4*1024*1024 - tolmk) - (1 << 16));
}
/* Write the ram configuration registers,
* preserving the reserved bits.
*/
tolm_r = pci_read_config16(mc_dev, 0xc4);
tolm_r = ((tolmk >> 17) << 11) | (tolm_r & 0x7ff);
pci_write_config16(mc_dev, 0xc4, tolm_r);
remapbase_r = pci_read_config16(mc_dev, 0xc6);
remapbase_r = (remapbasek >> 16) | (remapbase_r & 0xfc00);
pci_write_config16(mc_dev, 0xc6, remapbase_r);
remaplimit_r = pci_read_config16(mc_dev, 0xc8);
remaplimit_r = (remaplimitk >> 16) | (remaplimit_r & 0xfc00);
pci_write_config16(mc_dev, 0xc8, remaplimit_r);
/* Report the memory regions */
idx = 10;
ram_resource(dev, idx++, 0, 640);
ram_resource(dev, idx++, 768, tolmk - 768);
if (tomk > 4*1024*1024) {
ram_resource(dev, idx++, 4096*1024, tomk - 4*1024*1024);
}
if (remaplimitk >= remapbasek) {
ram_resource(dev, idx++, remapbasek,
(remaplimitk + 64*1024) - remapbasek);
}
#if CONFIG_WRITE_HIGH_TABLES==1
/* Leave some space for ACPI, PIRQ and MP tables */
high_tables_base = (tolmk - HIGH_TABLES_SIZE) * 1024;
high_tables_size = HIGH_TABLES_SIZE * 1024;
#endif
}
assign_resources(dev->link_list);
}
static struct device_operations pci_domain_ops = {
.read_resources = pci_domain_read_resources,
.set_resources = pci_domain_set_resources,
.enable_resources = enable_childrens_resources,
.init = 0,
.scan_bus = pci_domain_scan_bus,
.ops_pci_bus = &pci_cf8_conf1,
};
static void cpu_bus_init(device_t dev)
{
initialize_cpus(dev->link_list);
}
static void cpu_bus_noop(device_t dev)
{
}
static struct device_operations cpu_bus_ops = {
.read_resources = cpu_bus_noop,
.set_resources = cpu_bus_noop,
.enable_resources = cpu_bus_noop,
.init = cpu_bus_init,
.scan_bus = 0,
};
static void enable_dev(struct device *dev)
{
/* Set the operations if it is a special bus type */
if (dev->path.type == DEVICE_PATH_PCI_DOMAIN) {
dev->ops = &pci_domain_ops;
}
else if (dev->path.type == DEVICE_PATH_APIC_CLUSTER) {
dev->ops = &cpu_bus_ops;
}
}
struct chip_operations northbridge_intel_e7501_ops = {
CHIP_NAME("Intel E7501 Northbridge")
.enable_dev = enable_dev,
};
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