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// SPDX-License-Identifier: GPL-2.0
/*
* From Coreboot src/southbridge/intel/bd82x6x/early_me.c
*
* Copyright (C) 2011 The Chromium OS Authors. All rights reserved.
*/
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <sysreset.h>
#include <asm/pci.h>
#include <asm/cpu.h>
#include <asm/processor.h>
#include <asm/arch/me.h>
#include <asm/arch/pch.h>
#include <asm/io.h>
static const char *const me_ack_values[] = {
[ME_HFS_ACK_NO_DID] = "No DID Ack received",
[ME_HFS_ACK_RESET] = "Non-power cycle reset",
[ME_HFS_ACK_PWR_CYCLE] = "Power cycle reset",
[ME_HFS_ACK_S3] = "Go to S3",
[ME_HFS_ACK_S4] = "Go to S4",
[ME_HFS_ACK_S5] = "Go to S5",
[ME_HFS_ACK_GBL_RESET] = "Global Reset",
[ME_HFS_ACK_CONTINUE] = "Continue to boot"
};
int intel_early_me_init(struct udevice *me_dev)
{
int count;
struct me_uma uma;
struct me_hfs hfs;
debug("Intel ME early init\n");
/* Wait for ME UMA SIZE VALID bit to be set */
for (count = ME_RETRY; count > 0; --count) {
pci_read_dword_ptr(me_dev, &uma, PCI_ME_UMA);
if (uma.valid)
break;
udelay(ME_DELAY);
}
if (!count) {
printf("ERROR: ME is not ready!\n");
return -EBUSY;
}
/* Check for valid firmware */
pci_read_dword_ptr(me_dev, &hfs, PCI_ME_HFS);
if (hfs.fpt_bad) {
printf("WARNING: ME has bad firmware\n");
return -EBADF;
}
debug("Intel ME firmware is ready\n");
return 0;
}
int intel_early_me_uma_size(struct udevice *me_dev)
{
struct me_uma uma;
pci_read_dword_ptr(me_dev, &uma, PCI_ME_UMA);
if (uma.valid) {
debug("ME: Requested %uMB UMA\n", uma.size);
return uma.size;
}
debug("ME: Invalid UMA size\n");
return -EINVAL;
}
static inline void set_global_reset(struct udevice *dev, int enable)
{
u32 etr3;
dm_pci_read_config32(dev, ETR3, &etr3);
/* Clear CF9 Without Resume Well Reset Enable */
etr3 &= ~ETR3_CWORWRE;
/* CF9GR indicates a Global Reset */
if (enable)
etr3 |= ETR3_CF9GR;
else
etr3 &= ~ETR3_CF9GR;
dm_pci_write_config32(dev, ETR3, etr3);
}
int intel_early_me_init_done(struct udevice *dev, struct udevice *me_dev,
uint status)
{
int count;
u32 mebase_l, mebase_h;
struct me_hfs hfs;
struct me_did did = {
.init_done = ME_INIT_DONE,
.status = status
};
/* MEBASE from MESEG_BASE[35:20] */
dm_pci_read_config32(PCH_DEV, PCI_CPU_MEBASE_L, &mebase_l);
dm_pci_read_config32(PCH_DEV, PCI_CPU_MEBASE_H, &mebase_h);
mebase_h &= 0xf;
did.uma_base = (mebase_l >> 20) | (mebase_h << 12);
/* Send message to ME */
debug("ME: Sending Init Done with status: %d, UMA base: 0x%04x\n",
status, did.uma_base);
pci_write_dword_ptr(me_dev, &did, PCI_ME_H_GS);
/* Must wait for ME acknowledgement */
for (count = ME_RETRY; count > 0; --count) {
pci_read_dword_ptr(me_dev, &hfs, PCI_ME_HFS);
if (hfs.bios_msg_ack)
break;
udelay(ME_DELAY);
}
if (!count) {
printf("ERROR: ME failed to respond\n");
return -ETIMEDOUT;
}
/* Return the requested BIOS action */
debug("ME: Requested BIOS Action: %s\n", me_ack_values[hfs.ack_data]);
/* Check status after acknowledgement */
intel_me_status(me_dev);
switch (hfs.ack_data) {
case ME_HFS_ACK_CONTINUE:
/* Continue to boot */
return 0;
case ME_HFS_ACK_RESET:
/* Non-power cycle reset */
set_global_reset(dev, 0);
sysreset_walk_halt(SYSRESET_COLD);
break;
case ME_HFS_ACK_PWR_CYCLE:
/* Power cycle reset */
set_global_reset(dev, 0);
sysreset_walk_halt(SYSRESET_COLD);
break;
case ME_HFS_ACK_GBL_RESET:
/* Global reset */
set_global_reset(dev, 1);
sysreset_walk_halt(SYSRESET_COLD);
break;
case ME_HFS_ACK_S3:
case ME_HFS_ACK_S4:
case ME_HFS_ACK_S5:
break;
}
return -EINVAL;
}
static const struct udevice_id ivybridge_syscon_ids[] = {
{ .compatible = "intel,me", .data = X86_SYSCON_ME },
{ }
};
U_BOOT_DRIVER(syscon_intel_me) = {
.name = "intel_me_syscon",
.id = UCLASS_SYSCON,
.of_match = ivybridge_syscon_ids,
};
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