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/* SPDX-License-Identifier: GPL-2.0-only */
/* This file is part of the coreboot project. */
#include <cpu/x86/smm.h>
#include <device/device.h>
#include <device/pci.h>
#include <device/pci_ids.h>
#include <vendorcode/google/chromeos/chromeos.h>
#include <arch/acpi.h>
#include <stddef.h>
#include <soc/iomap.h>
#include <soc/iosf.h>
#include <soc/pci_devs.h>
#include <soc/ramstage.h>
/* Host Memory Map:
*
* +--------------------------+ BMBOUND_HI
* | Usable DRAM |
* +--------------------------+ 4GiB
* | PCI Address Space |
* +--------------------------+ BMBOUND
* | TPM |
* +--------------------------+ IMR2
* | TXE |
* +--------------------------+ IMR1
* | iGD |
* +--------------------------+
* | GTT |
* +--------------------------+ SMMRRH, IRM0
* | TSEG |
* +--------------------------+ SMMRRL
* | Usable DRAM |
* +--------------------------+ 0
*
* Note that there are really only a few regions that need to enumerated w.r.t.
* coreboot's resource model:
*
* +--------------------------+ BMBOUND_HI
* | Cacheable/Usable |
* +--------------------------+ 4GiB
*
* +--------------------------+ BMBOUND
* | Uncacheable/Reserved |
* +--------------------------+ SMMRRH
* | Cacheable/Reserved |
* +--------------------------+ SMMRRL
* | Cacheable/Usable |
* +--------------------------+ 0
*/
#define RES_IN_KiB(r) ((r) >> 10)
uint32_t nc_read_top_of_low_memory(void)
{
MAYBE_STATIC_BSS uint32_t tolm = 0;
if (tolm)
return tolm;
tolm = iosf_bunit_read(BUNIT_BMBOUND) & ~((1 << 27) - 1);
return tolm;
}
static void nc_read_resources(struct device *dev)
{
unsigned long mmconf;
unsigned long bmbound;
unsigned long bmbound_hi;
unsigned long smmrrh;
unsigned long smmrrl;
unsigned long base_k, size_k;
const unsigned long four_gig_kib = (4 << (30 - 10));
int index = 0;
/* Read standard PCI resources. */
pci_dev_read_resources(dev);
/* PCIe memory-mapped config space access - 256 MiB. */
mmconf = iosf_bunit_read(BUNIT_MMCONF_REG) & ~((1 << 28) - 1);
mmio_resource(dev, BUNIT_MMCONF_REG, RES_IN_KiB(mmconf), 256 * 1024);
/* 0 -> 0xa0000 */
base_k = RES_IN_KiB(0);
size_k = RES_IN_KiB(0xa0000) - base_k;
ram_resource(dev, index++, base_k, size_k);
/* The SMMRR registers are 1MiB granularity with smmrrh being
* inclusive of the SMM region. */
smmrrl = (iosf_bunit_read(BUNIT_SMRRL) & 0xffff) << 10;
smmrrh = ((iosf_bunit_read(BUNIT_SMRRH) & 0xffff) + 1) << 10;
/* 0xc0000 -> smrrl - cacheable and usable */
base_k = RES_IN_KiB(0xc0000);
size_k = smmrrl - base_k;
ram_resource(dev, index++, base_k, size_k);
if (smmrrh > smmrrl)
reserved_ram_resource(dev, index++, smmrrl, smmrrh - smmrrl);
/* All address space between bmbound and smmrrh is unusable. */
bmbound = RES_IN_KiB(nc_read_top_of_low_memory());
mmio_resource(dev, index++, smmrrh, bmbound - smmrrh);
/* The BMBOUND_HI register matches register bits of 31:24 with address
* bits of 35:28. Therefore, shift register to align properly. */
bmbound_hi = iosf_bunit_read(BUNIT_BMBOUND_HI) & ~((1 << 24) - 1);
bmbound_hi = RES_IN_KiB(bmbound_hi) << 4;
if (bmbound_hi > four_gig_kib)
ram_resource(dev, index++, four_gig_kib,
bmbound_hi - four_gig_kib);
/* Reserve everything between A segment and 1MB:
*
* 0xa0000 - 0xbffff: legacy VGA
* 0xc0000 - 0xfffff: RAM
*/
mmio_resource(dev, index++, (0xa0000 >> 10), (0xc0000 - 0xa0000) >> 10);
reserved_ram_resource(dev, index++, (0xc0000 >> 10),
(0x100000 - 0xc0000) >> 10);
if (CONFIG(CHROMEOS))
chromeos_reserve_ram_oops(dev, index++);
}
static struct device_operations nc_ops = {
.read_resources = nc_read_resources,
.acpi_fill_ssdt = generate_cpu_entries,
.ops_pci = &soc_pci_ops,
};
static const struct pci_driver nc_driver __pci_driver = {
.ops = &nc_ops,
.vendor = PCI_VENDOR_ID_INTEL,
.device = SOC_DEVID,
};
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