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/* Turn off machine check triggers when reading
* pci space where there are no devices.
* This is necessary when scaning the bus for
* devices which is done by the kernel
*
* written in 2003 by Eric Biederman
*
* - Athlon64 workarounds by Stefan Reinauer
* - "reset once" logic by Yinghai Lu
*/
#include <console/console.h>
#include <device/device.h>
#include <device/pci.h>
#include <device/pci_ids.h>
#include <device/pci_ops.h>
#include <part/hard_reset.h>
#include <pc80/mc146818rtc.h>
#include <bitops.h>
#include "./cpu_rev.c"
#include "amdk8.h"
/**
* @brief Read resources for AGP aperture
*
* @param
*
* There is only one AGP aperture resource needed. The resoruce is added to
* the northbridge of BSP.
*
* The same trick can be used to augment legacy VGA resources which can
* be detect by generic pci reousrce allocator for VGA devices.
* BAD: it is more tricky than I think, the resource allocation code is
* implemented in a way to NOT DOING legacy VGA resource allcation on
* purpose :-(.
*/
static void mcf3_read_resources(device_t dev)
{
struct resource *resource;
unsigned char iommu;
/* Read the generic PCI resources */
pci_dev_read_resources(dev);
/* If we are not the first processor don't allocate the gart apeture */
if (dev->path.u.pci.devfn != PCI_DEVFN(0x18, 0x3)) {
return;
}
iommu = 1;
get_option(&iommu, "iommu");
if (iommu) {
/* Add a Gart apeture resource */
resource = new_resource(dev, 0x94);
resource->size = iommu?AGP_APERTURE_SIZE:1;
resource->align = log2(resource->size);
resource->gran = log2(resource->size);
resource->limit = 0xffffffff; /* 4G */
resource->flags = IORESOURCE_MEM;
}
}
static void set_agp_aperture(device_t dev)
{
struct resource *resource;
resource = probe_resource(dev, 0x94);
if (resource) {
device_t pdev;
uint32_t gart_base, gart_acr;
/* Remember this resource has been stored */
resource->flags |= IORESOURCE_STORED;
/*Find the size of the GART aperture */
gart_acr = (0<<6)|(0<<5)|(0<<4)| ((log2(resource->size) - 25) << 1)|(0<<0);
/* Get the base address */
gart_base = ((resource->base) >> 25) & 0x00007fff;
/* Update the other northbriges */
pdev = 0;
while (pdev = dev_find_device(PCI_VENDOR_ID_AMD, 0x1103, pdev)) {
/* Store GART size but don't enable it */
pci_write_config32(pdev, 0x90, gart_acr);
/* Store the GART base address */
pci_write_config32(pdev, 0x94, gart_base);
/* Don't set the GART Table base address */
pci_write_config32(pdev, 0x98, 0);
/* Report the resource has been stored... */
report_resource_stored(pdev, resource, " <gart>");
}
}
}
static void mcf3_set_resources(device_t dev)
{
/* Set the gart apeture */
set_agp_aperture(dev);
/* Set the generic PCI resources */
pci_dev_set_resources(dev);
}
static void misc_control_init(struct device *dev)
{
uint32_t cmd, cmd_ref;
int needs_reset;
struct device *f0_dev, *f2_dev;
printk_debug("NB: Function 3 Misc Control.. ");
needs_reset = 0;
/* Disable Machine checks from Invalid Locations.
* This is needed for PC backwards compatibility.
*/
cmd = pci_read_config32(dev, 0x44);
cmd |= (1<<6) | (1<<25);
pci_write_config32(dev, 0x44, cmd );
if (is_cpu_pre_c0()) {
/* Errata 58
* Disable CPU low power states C2, C1 and throttling
*/
cmd = pci_read_config32(dev, 0x80);
cmd &= ~(1<<0);
pci_write_config32(dev, 0x80, cmd );
cmd = pci_read_config32(dev, 0x84);
cmd &= ~(1<<24);
cmd &= ~(1<<8);
pci_write_config32(dev, 0x84, cmd );
/* Errata 66
* Limit the number of downstream posted requests to 1
*/
cmd = pci_read_config32(dev, 0x70);
if ((cmd & (3 << 0)) != 2) {
cmd &= ~(3<<0);
cmd |= (2<<0);
pci_write_config32(dev, 0x70, cmd );
needs_reset = 1;
}
cmd = pci_read_config32(dev, 0x7c);
if ((cmd & (3 << 4)) != 0) {
cmd &= ~(3<<4);
cmd |= (0<<4);
pci_write_config32(dev, 0x7c, cmd );
needs_reset = 1;
}
/* Clock Power/Timing Low */
cmd = pci_read_config32(dev, 0xd4);
if (cmd != 0x000D0001) {
cmd = 0x000D0001;
pci_write_config32(dev, 0xd4, cmd);
needs_reset = 1; /* Needed? */
}
}
else {
uint32_t dcl;
f2_dev = dev_find_slot(0, dev->path.u.pci.devfn - 3 + 2);
/* Errata 98
* Set Clk Ramp Hystersis to 7
* Clock Power/Timing Low
*/
cmd_ref = 0x04e20707; /* Registered */
dcl = pci_read_config32(f2_dev, DRAM_CONFIG_LOW);
if (dcl & DCL_UnBufDimm) {
cmd_ref = 0x000D0701; /* Unbuffered */
}
cmd = pci_read_config32(dev, 0xd4);
if(cmd != cmd_ref) {
pci_write_config32(dev, 0xd4, cmd_ref );
needs_reset = 1; /* Needed? */
}
}
#if CONFIG_MAX_CPUS > 1
/* Single CPU systems don't seem to need this. It might cause resets? (YhLu) */
/* Optimize the Link read pointers */
f0_dev = dev_find_slot(0, dev->path.u.pci.devfn - 3);
if (f0_dev) {
int link;
cmd_ref = cmd = pci_read_config32(dev, 0xdc);
for(link = 0; link < 3; link++) {
uint32_t link_type;
unsigned reg;
/* This works on an Athlon64 because unimplemented links return 0 */
reg = 0x98 + (link * 0x20);
link_type = pci_read_config32(f0_dev, reg);
if (link_type & LinkConnected) {
cmd &= 0xff << (link *8);
/* FIXME this assumes the device on the other side is an AMD device */
cmd |= 0x25 << (link *8);
}
}
if (cmd != cmd_ref) {
pci_write_config32(dev, 0xdc, cmd);
needs_reset = 1;
}
}
else {
printk_err("Missing f0 device!\n");
}
#endif
if (needs_reset) {
printk_debug("resetting cpu\n");
hard_reset();
}
printk_debug("done.\n");
}
static struct device_operations mcf3_ops = {
.read_resources = mcf3_read_resources,
.set_resources = mcf3_set_resources,
.enable_resources = pci_dev_enable_resources,
.init = misc_control_init,
.scan_bus = 0,
};
static struct pci_driver mcf3_driver __pci_driver = {
.ops = &mcf3_ops,
.vendor = PCI_VENDOR_ID_AMD,
.device = 0x1103,
};
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