mirror of
https://github.com/AsahiLinux/u-boot
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192 lines
3.9 KiB
C
192 lines
3.9 KiB
C
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/*
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* From Coreboot src/southbridge/intel/bd82x6x/early_me.c
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*
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* Copyright (C) 2011 The Chromium OS Authors. All rights reserved.
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*
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* SPDX-License-Identifier: GPL-2.0
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*/
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#include <common.h>
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#include <errno.h>
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#include <asm/pci.h>
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#include <asm/processor.h>
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#include <asm/arch/me.h>
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#include <asm/arch/pch.h>
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#include <asm/io.h>
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static const char *const me_ack_values[] = {
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[ME_HFS_ACK_NO_DID] = "No DID Ack received",
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[ME_HFS_ACK_RESET] = "Non-power cycle reset",
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[ME_HFS_ACK_PWR_CYCLE] = "Power cycle reset",
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[ME_HFS_ACK_S3] = "Go to S3",
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[ME_HFS_ACK_S4] = "Go to S4",
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[ME_HFS_ACK_S5] = "Go to S5",
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[ME_HFS_ACK_GBL_RESET] = "Global Reset",
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[ME_HFS_ACK_CONTINUE] = "Continue to boot"
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};
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static inline void pci_read_dword_ptr(void *ptr, int offset)
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{
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u32 dword;
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dword = pci_read_config32(PCH_ME_DEV, offset);
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memcpy(ptr, &dword, sizeof(dword));
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}
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static inline void pci_write_dword_ptr(void *ptr, int offset)
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{
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u32 dword = 0;
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memcpy(&dword, ptr, sizeof(dword));
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pci_write_config32(PCH_ME_DEV, offset, dword);
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}
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void intel_early_me_status(void)
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{
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struct me_hfs hfs;
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struct me_gmes gmes;
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pci_read_dword_ptr(&hfs, PCI_ME_HFS);
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pci_read_dword_ptr(&gmes, PCI_ME_GMES);
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intel_me_status(&hfs, &gmes);
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}
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int intel_early_me_init(void)
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{
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int count;
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struct me_uma uma;
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struct me_hfs hfs;
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debug("Intel ME early init\n");
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/* Wait for ME UMA SIZE VALID bit to be set */
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for (count = ME_RETRY; count > 0; --count) {
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pci_read_dword_ptr(&uma, PCI_ME_UMA);
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if (uma.valid)
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break;
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udelay(ME_DELAY);
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}
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if (!count) {
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printf("ERROR: ME is not ready!\n");
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return -EBUSY;
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}
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/* Check for valid firmware */
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pci_read_dword_ptr(&hfs, PCI_ME_HFS);
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if (hfs.fpt_bad) {
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printf("WARNING: ME has bad firmware\n");
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return -EBADF;
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}
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debug("Intel ME firmware is ready\n");
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return 0;
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}
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int intel_early_me_uma_size(void)
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{
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struct me_uma uma;
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pci_read_dword_ptr(&uma, PCI_ME_UMA);
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if (uma.valid) {
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debug("ME: Requested %uMB UMA\n", uma.size);
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return uma.size;
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}
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debug("ME: Invalid UMA size\n");
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return -EINVAL;
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}
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static inline void set_global_reset(int enable)
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{
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u32 etr3;
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etr3 = pci_read_config32(PCH_LPC_DEV, ETR3);
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/* Clear CF9 Without Resume Well Reset Enable */
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etr3 &= ~ETR3_CWORWRE;
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/* CF9GR indicates a Global Reset */
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if (enable)
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etr3 |= ETR3_CF9GR;
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else
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etr3 &= ~ETR3_CF9GR;
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pci_write_config32(PCH_LPC_DEV, ETR3, etr3);
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}
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int intel_early_me_init_done(u8 status)
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{
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u8 reset;
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int count;
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u32 mebase_l, mebase_h;
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struct me_hfs hfs;
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struct me_did did = {
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.init_done = ME_INIT_DONE,
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.status = status
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};
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/* MEBASE from MESEG_BASE[35:20] */
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mebase_l = pci_read_config32(PCH_DEV, PCI_CPU_MEBASE_L);
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mebase_h = pci_read_config32(PCH_DEV, PCI_CPU_MEBASE_H);
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mebase_h &= 0xf;
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did.uma_base = (mebase_l >> 20) | (mebase_h << 12);
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/* Send message to ME */
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debug("ME: Sending Init Done with status: %d, UMA base: 0x%04x\n",
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status, did.uma_base);
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pci_write_dword_ptr(&did, PCI_ME_H_GS);
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/* Must wait for ME acknowledgement */
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for (count = ME_RETRY; count > 0; --count) {
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pci_read_dword_ptr(&hfs, PCI_ME_HFS);
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if (hfs.bios_msg_ack)
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break;
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udelay(ME_DELAY);
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}
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if (!count) {
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printf("ERROR: ME failed to respond\n");
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return -1;
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}
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/* Return the requested BIOS action */
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debug("ME: Requested BIOS Action: %s\n", me_ack_values[hfs.ack_data]);
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/* Check status after acknowledgement */
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intel_early_me_status();
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reset = 0;
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switch (hfs.ack_data) {
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case ME_HFS_ACK_CONTINUE:
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/* Continue to boot */
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return 0;
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case ME_HFS_ACK_RESET:
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/* Non-power cycle reset */
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set_global_reset(0);
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reset = 0x06;
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break;
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case ME_HFS_ACK_PWR_CYCLE:
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/* Power cycle reset */
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set_global_reset(0);
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reset = 0x0e;
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break;
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case ME_HFS_ACK_GBL_RESET:
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/* Global reset */
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set_global_reset(1);
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reset = 0x0e;
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break;
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case ME_HFS_ACK_S3:
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case ME_HFS_ACK_S4:
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case ME_HFS_ACK_S5:
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break;
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}
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/* Perform the requested reset */
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if (reset) {
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outb(reset, 0xcf9);
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cpu_hlt();
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}
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return -1;
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}
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