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/* SPDX-License-Identifier: GPL-2.0-only */
#include <acpi/acpi.h>
#include <acpi/acpigen.h>
#include <device/device.h>
#include <device/pci.h>
#include <device/pci_ids.h>
#include <stdint.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
*/
uint32_t nc_read_top_of_low_memory(void)
{
static uint32_t tolm;
if (tolm)
return tolm;
tolm = iosf_bunit_read(BUNIT_BMBOUND) & ~((1 << 27) - 1);
return tolm;
}
static void nc_read_resources(struct device *dev)
{
uint64_t mmconf;
uint64_t bmbound;
uint64_t bmbound_hi;
uint64_t smmrrh;
uint64_t smmrrl;
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_range(dev, BUNIT_MMCONF_REG, mmconf, CONFIG_ECAM_MMCONF_BUS_NUMBER * MiB);
/* 0 -> 0xa0000 */
ram_from_to(dev, index++, 0, 0xa0000);
/* The SMMRR registers are 1MiB granularity with smmrrh being
* inclusive of the SMM region. */
smmrrl = (iosf_bunit_read(BUNIT_SMRRL) & 0xffff) * MiB;
smmrrh = ((iosf_bunit_read(BUNIT_SMRRH) & 0xffff) + 1) * MiB;
/* 0xc0000 -> smrrl - cacheable and usable */
ram_from_to(dev, index++, 0xc0000, smmrrl);
if (smmrrh > smmrrl)
reserved_ram_from_to(dev, index++, smmrrl, smmrrh);
/* All address space between bmbound and smmrrh is unusable. */
bmbound = nc_read_top_of_low_memory();
mmio_from_to(dev, index++, smmrrh, bmbound);
/*
* 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 <<= 4;
upper_ram_end(dev, index++, bmbound_hi);
/*
* Reserve everything between A segment and 1MB:
*
* 0xa0000 - 0xbffff: legacy VGA
* 0xc0000 - 0xfffff: RAM
*/
mmio_from_to(dev, index++, 0xa0000, 0xc0000);
reserved_ram_from_to(dev, index++, 0xc0000, 1 * MiB);
}
static void nc_generate_ssdt(const struct device *dev)
{
generate_cpu_entries(dev);
acpigen_write_scope("\\");
acpigen_write_name_dword("TOLM", nc_read_top_of_low_memory());
acpigen_pop_len();
}
static struct device_operations nc_ops = {
.read_resources = nc_read_resources,
.acpi_fill_ssdt = nc_generate_ssdt,
.ops_pci = &soc_pci_ops,
};
static const struct pci_driver nc_driver __pci_driver = {
.ops = &nc_ops,
.vendor = PCI_VID_INTEL,
.device = SOC_DEVID,
};
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