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#include <console/console.h>
#include <arch/io.h>
#include <stdint.h>
#include <device/device.h>
#include <device/pci.h>
#include <device/pci_ids.h>
#include <stdlib.h>
#include <string.h>
#include <bitops.h>
#include "chip.h"
#include "northbridge.h"
#include <cpu/amd/gx1def.h>
#include <cpu/x86/cache.h>
#include <cpu/cpu.h>
#define NORTHBRIDGE_FILE "northbridge.c"
/*
*/
static void optimize_xbus(device_t dev)
{
/* Optimise X-Bus performance */
pci_write_config8(dev, 0x40, 0x1e);
pci_write_config8(dev, 0x41, 0x52);
pci_write_config8(dev, 0x43, 0xc1);
pci_write_config8(dev, 0x44, 0x00);
}
/**
* Enables memory from 0xC0000 up to 0xFFFFF.
* So this region is read/write and cache able
*
* FIXME: What about PCI master access into
* this region?
**/
static void enable_shadow(device_t dev)
{
writel(0x77777777,GX_BASE+BC_XMAP_2);
writel(0x77777777,GX_BASE+BC_XMAP_3);
}
static void northbridge_init(device_t dev)
{
printk_debug("northbridge: %s()\n", __FUNCTION__);
optimize_xbus(dev);
enable_shadow(dev);
printk_spew("Calling enable_cache()\n");
enable_cache();
}
static struct device_operations northbridge_operations = {
.read_resources = pci_dev_read_resources,
.set_resources = pci_dev_set_resources,
.enable_resources = pci_dev_enable_resources,
.init = northbridge_init,
.enable = 0,
.ops_pci = 0,
};
static const struct pci_driver northbridge_driver __pci_driver = {
.ops = &northbridge_operations,
.vendor = PCI_VENDOR_ID_CYRIX,
.device = PCI_DEVICE_ID_CYRIX_PCI_MASTER,
};
#define BRIDGE_IO_MASK (IORESOURCE_IO | IORESOURCE_MEM)
static void pci_domain_read_resources(device_t dev)
{
struct resource *resource;
printk_spew("%s:%s()\n", NORTHBRIDGE_FILE, __FUNCTION__);
/* Initialize the system wide io space constraints */
resource = new_resource(dev, IOINDEX_SUBTRACTIVE(0,0));
resource->limit = 0xffffUL;
resource->flags = IORESOURCE_IO | IORESOURCE_SUBTRACTIVE | IORESOURCE_ASSIGNED;
/* Initialize the system wide memory resources constraints */
resource = new_resource(dev, IOINDEX_SUBTRACTIVE(1,0));
resource->limit = 0xffffffffULL;
resource->flags = IORESOURCE_MEM | IORESOURCE_SUBTRACTIVE | IORESOURCE_ASSIGNED;
}
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;
}
static void pci_domain_set_resources(device_t dev)
{
device_t mc_dev;
uint32_t pci_tolm;
pci_tolm = find_pci_tolm(&dev->link[0]);
mc_dev = dev->link[0].children;
if (mc_dev) {
unsigned int tomk, tolmk;
unsigned int ramreg = 0;
int i, idx;
unsigned int *bcdramtop = (unsigned int *)(GX_BASE + BC_DRAM_TOP);
unsigned int *mcgbaseadd = (unsigned int *)(GX_BASE + MC_GBASE_ADD);
for(i=0; i<0x20; i+= 0x10) {
unsigned int *mcreg = (unsigned int *)(GX_BASE + MC_BANK_CFG);
unsigned int mem_config = *mcreg;
if (((mem_config & (DIMM_PG_SZ << i)) >> (4 + i)) == 7)
continue;
ramreg += 1 << (((mem_config & (DIMM_SZ << i)) >> (i + 8)) + 2);
}
tomk = ramreg << 10;
/* Sort out the framebuffer size */
tomk -= CONFIG_VIDEO_MB * 1024;
*bcdramtop = ((tomk << 10) - 1);
*mcgbaseadd = (tomk >> 9);
printk_debug("BC_DRAM_TOP = 0x%08x\n", *bcdramtop);
printk_debug("MC_GBASE_ADD = 0x%08x\n", *mcgbaseadd);
printk_debug("I would set ram size to %d Mbytes\n", (tomk >> 10));
/* Compute the top of Low memory */
tolmk = pci_tolm >> 10;
if (tolmk >= tomk) {
/* The PCI hole does does not overlap the memory.
*/
tolmk = tomk;
}
/* Report the memory regions */
idx = 10;
ram_resource(dev, idx++, 0, tolmk);
}
assign_resources(&dev->link[0]);
}
static unsigned int pci_domain_scan_bus(device_t dev, unsigned int max)
{
max = pci_scan_bus(&dev->link[0], PCI_DEVFN(0, 0), 0xff, max);
return max;
}
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,
};
static void cpu_bus_init(device_t dev)
{
printk_spew("%s:%s()\n", NORTHBRIDGE_FILE, __FUNCTION__);
initialize_cpus(&dev->link[0]);
}
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)
{
printk_spew("%s:%s()\n", NORTHBRIDGE_FILE, __FUNCTION__);
/* Set the operations if it is a special bus type */
if (dev->path.type == DEVICE_PATH_PCI_DOMAIN) {
printk_spew("DEVICE_PATH_PCI_DOMAIN\n");
dev->ops = &pci_domain_ops;
pci_set_method(dev);
}
else if (dev->path.type == DEVICE_PATH_APIC_CLUSTER) {
printk_spew("DEVICE_PATH_APIC_CLUSTER\n");
dev->ops = &cpu_bus_ops;
} else {
printk_spew("device path type %d\n",dev->path.type);
}
}
struct chip_operations northbridge_amd_gx1_ops = {
CHIP_NAME("AMD GX1 Northbridge")
.enable_dev = enable_dev,
};
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