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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2013 Google Inc.
* Copyright (C) 2015 Intel Corp.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <arch/acpi.h>
#include <cbmem.h>
#include <console/console.h>
#include <cpu/x86/smm.h>
#include <device/device.h>
#include <device/pci.h>
#include <device/pci_ids.h>
#include <fsp/memmap.h>
#include <fsp/util.h>
#include <soc/iomap.h>
#include <soc/iosf.h>
#include <soc/pci_devs.h>
#include <soc/ramstage.h>
#include <soc/smm.h>
#include <vendorcode/google/chromeos/chromeos.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 resrouce 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)
{
return iosf_bunit_read(BUNIT_BMBOUND) & ~((1 << 27) - 1);
}
static void nc_read_resources(device_t dev)
{
unsigned long mmconf;
unsigned long bmbound_k;
unsigned long bmbound_hi;
void *smm_base;
size_t smm_size;
unsigned long tseg_base_k;
unsigned long tseg_top_k;
unsigned long fsp_res_base_k;
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);
/* Determine TSEG data */
smm_region(&smm_base, &smm_size);
tseg_base_k = RES_IN_KIB((unsigned long) smm_base);
tseg_top_k = tseg_base_k + RES_IN_KIB(smm_size);
/* Determine the base of the FSP reserved memory */
fsp_res_base_k = RES_IN_KIB((unsigned long) cbmem_top());
/* 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);
/* 0xc0000 -> fsp_res_base - cacheable and usable */
base_k = RES_IN_KIB(0xc0000);
size_k = fsp_res_base_k - base_k;
ram_resource(dev, index++, base_k, size_k);
/* fsp_res_base -> tseg_top - Reserved */
base_k = fsp_res_base_k;
size_k = tseg_top_k - base_k;
reserved_ram_resource(dev, index++, base_k, size_k);
/* TSEG TOP -> bmbound is memory backed mmio. */
bmbound_k = RES_IN_KIB(nc_read_top_of_low_memory());
mmio_resource(dev, index++, tseg_top_k, bmbound_k - tseg_top_k);
/*
* 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);
chromeos_reserve_ram_oops(dev, index++);
}
static struct device_operations nc_ops = {
.acpi_fill_ssdt_generator = generate_cpu_entries,
.read_resources = nc_read_resources,
.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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