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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright 2019 Google LLC
*/
#include <common.h>
#include <dm.h>
#include <dt-structs.h>
#include <log.h>
#include <spl.h>
#include <asm/intel_pinctrl.h>
#include <asm/intel_regs.h>
#include <asm/pci.h>
#include <asm/arch/systemagent.h>
/**
* struct apl_hostbridge_platdata - platform data for hostbridge
*
* @dtplat: Platform data for of-platdata
* @early_pads: Early pad data to set up, each (pad, cfg0, cfg1)
* @early_pads_count: Number of pads to process
* @pciex_region_size: BAR length in bytes
* @bdf: Bus/device/function of hostbridge
*/
struct apl_hostbridge_platdata {
#if CONFIG_IS_ENABLED(OF_PLATDATA)
struct dtd_intel_apl_hostbridge dtplat;
#endif
u32 *early_pads;
int early_pads_count;
uint pciex_region_size;
pci_dev_t bdf;
};
enum {
PCIEXBAR = 0x60,
PCIEXBAR_LENGTH_256MB = 0,
PCIEXBAR_LENGTH_128MB,
PCIEXBAR_LENGTH_64MB,
PCIEXBAR_PCIEXBAREN = 1 << 0,
TSEG = 0xb8, /* TSEG base */
};
static int apl_hostbridge_early_init_pinctrl(struct udevice *dev)
{
struct apl_hostbridge_platdata *plat = dev_get_platdata(dev);
struct udevice *pinctrl;
int ret;
ret = uclass_first_device_err(UCLASS_PINCTRL, &pinctrl);
if (ret)
return log_msg_ret("no hostbridge pinctrl", ret);
return pinctrl_config_pads(pinctrl, plat->early_pads,
plat->early_pads_count);
}
static int apl_hostbridge_early_init(struct udevice *dev)
{
struct apl_hostbridge_platdata *plat = dev_get_platdata(dev);
u32 region_size;
ulong base;
u32 reg;
int ret;
/* Set up the MCHBAR */
pci_x86_read_config(plat->bdf, MCHBAR, &base, PCI_SIZE_32);
base = MCH_BASE_ADDRESS;
pci_x86_write_config(plat->bdf, MCHBAR, base | 1, PCI_SIZE_32);
/*
* The PCIEXBAR is assumed to live in the memory mapped IO space under
* 4GiB
*/
pci_x86_write_config(plat->bdf, PCIEXBAR + 4, 0, PCI_SIZE_32);
switch (plat->pciex_region_size >> 20) {
default:
case 256:
region_size = PCIEXBAR_LENGTH_256MB;
break;
case 128:
region_size = PCIEXBAR_LENGTH_128MB;
break;
case 64:
region_size = PCIEXBAR_LENGTH_64MB;
break;
}
reg = CONFIG_MMCONF_BASE_ADDRESS | (region_size << 1)
| PCIEXBAR_PCIEXBAREN;
pci_x86_write_config(plat->bdf, PCIEXBAR, reg, PCI_SIZE_32);
/*
* TSEG defines the base of SMM range. BIOS determines the base
* of TSEG memory which must be at or below Graphics base of GTT
* Stolen memory, hence its better to clear TSEG register early
* to avoid power on default non-zero value (if any).
*/
pci_x86_write_config(plat->bdf, TSEG, 0, PCI_SIZE_32);
ret = apl_hostbridge_early_init_pinctrl(dev);
if (ret)
return log_msg_ret("pinctrl", ret);
return 0;
}
static int apl_hostbridge_ofdata_to_platdata(struct udevice *dev)
{
struct apl_hostbridge_platdata *plat = dev_get_platdata(dev);
struct udevice *pinctrl;
int ret;
/*
* The host bridge holds the early pad data needed to get through TPL.
* This is a small amount of data, enough to fit in TPL, so we keep it
* separate from the full pad data, stored in the fsp-s subnode. That
* subnode is not present in TPL, to save space.
*/
ret = uclass_first_device_err(UCLASS_PINCTRL, &pinctrl);
if (ret)
return log_msg_ret("no hostbridge PINCTRL", ret);
#if !CONFIG_IS_ENABLED(OF_PLATDATA)
int root;
/* Get length of PCI Express Region */
plat->pciex_region_size = dev_read_u32_default(dev, "pciex-region-size",
256 << 20);
root = pci_get_devfn(dev);
if (root < 0)
return log_msg_ret("Cannot get host-bridge PCI address", root);
plat->bdf = root;
ret = pinctrl_read_pads(pinctrl, dev_ofnode(dev), "early-pads",
&plat->early_pads, &plat->early_pads_count);
if (ret)
return log_msg_ret("early-pads", ret);
#else
struct dtd_intel_apl_hostbridge *dtplat = &plat->dtplat;
int size;
plat->pciex_region_size = dtplat->pciex_region_size;
plat->bdf = pci_ofplat_get_devfn(dtplat->reg[0]);
/* Assume that if everything is 0, it is empty */
plat->early_pads = dtplat->early_pads;
size = ARRAY_SIZE(dtplat->early_pads);
plat->early_pads_count = pinctrl_count_pads(pinctrl, plat->early_pads,
size);
#endif
return 0;
}
static int apl_hostbridge_probe(struct udevice *dev)
{
if (spl_phase() == PHASE_TPL)
return apl_hostbridge_early_init(dev);
return 0;
}
static const struct udevice_id apl_hostbridge_ids[] = {
{ .compatible = "intel,apl-hostbridge" },
{ }
};
U_BOOT_DRIVER(apl_hostbridge_drv) = {
.name = "intel_apl_hostbridge",
.id = UCLASS_NORTHBRIDGE,
.of_match = apl_hostbridge_ids,
.ofdata_to_platdata = apl_hostbridge_ofdata_to_platdata,
.probe = apl_hostbridge_probe,
.platdata_auto_alloc_size = sizeof(struct apl_hostbridge_platdata),
};
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