| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #include <arch/io.h> |
| #include <device/pci_ops.h> |
| #include <console/console.h> |
| #include <delay.h> |
| #include <device/pci_def.h> |
| #include <halt.h> |
| #include <string.h> |
| #include "me.h" |
| #include "pch.h" |
| |
| static const char *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" |
| }; |
| |
| static inline void pci_read_dword_ptr(void *ptr, int offset) |
| { |
| u32 dword = pci_read_config32(PCH_ME_DEV, offset); |
| memcpy(ptr, &dword, sizeof(dword)); |
| } |
| |
| static inline void pci_write_dword_ptr(void *ptr, int offset) |
| { |
| u32 dword = 0; |
| memcpy(&dword, ptr, sizeof(dword)); |
| pci_write_config32(PCH_ME_DEV, offset, dword); |
| } |
| |
| void intel_early_me_status(void) |
| { |
| struct me_hfs hfs; |
| struct me_gmes gmes; |
| u32 id = pci_read_config32(PCH_ME_DEV, PCI_VENDOR_ID); |
| |
| if ((id == 0xffffffff) || (id == 0x00000000) || |
| (id == 0x0000ffff) || (id == 0xffff0000)) { |
| printk(BIOS_DEBUG, "Missing Intel ME PCI device.\n"); |
| } else { |
| pci_read_dword_ptr(&hfs, PCI_ME_HFS); |
| pci_read_dword_ptr(&gmes, PCI_ME_GMES); |
| |
| intel_me_status(&hfs, &gmes); |
| } |
| } |
| |
| int intel_early_me_init(void) |
| { |
| int count; |
| struct me_uma uma; |
| struct me_hfs hfs; |
| |
| printk(BIOS_INFO, "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(&uma, PCI_ME_UMA); |
| if (uma.valid) |
| break; |
| udelay(ME_DELAY); |
| } |
| if (!count) { |
| printk(BIOS_ERR, "ERROR: ME is not ready!\n"); |
| return -1; |
| } |
| |
| /* Check for valid firmware */ |
| pci_read_dword_ptr(&hfs, PCI_ME_HFS); |
| if (hfs.fpt_bad) { |
| printk(BIOS_WARNING, "WARNING: ME has bad firmware\n"); |
| return -1; |
| } |
| |
| printk(BIOS_INFO, "Intel ME firmware is ready\n"); |
| return 0; |
| } |
| |
| int intel_early_me_uma_size(void) |
| { |
| struct me_uma uma; |
| |
| pci_read_dword_ptr(&uma, PCI_ME_UMA); |
| if (uma.valid) { |
| printk(BIOS_DEBUG, "ME: Requested %uMB UMA\n", uma.size); |
| return uma.size; |
| } |
| |
| printk(BIOS_DEBUG, "ME: Invalid UMA size\n"); |
| return 0; |
| } |
| |
| static inline void set_global_reset(int enable) |
| { |
| u32 etr3 = pci_read_config32(PCH_LPC_DEV, 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; |
| |
| pci_write_config32(PCH_LPC_DEV, ETR3, etr3); |
| } |
| |
| int intel_early_me_init_done(u8 status) |
| { |
| u8 reset; |
| 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] */ |
| mebase_l = pci_read_config32(PCI_CPU_DEVICE, PCI_CPU_MEBASE_L); |
| mebase_h = pci_read_config32(PCI_CPU_DEVICE, PCI_CPU_MEBASE_H) & 0xf; |
| did.uma_base = (mebase_l >> 20) | (mebase_h << 12); |
| |
| /* Send message to ME */ |
| printk(BIOS_DEBUG, "ME: Sending Init Done with status: %d, " |
| "UMA base: 0x%04x\n", status, did.uma_base); |
| |
| pci_write_dword_ptr(&did, PCI_ME_H_GS); |
| |
| /* Must wait for ME acknowledgement */ |
| for (count = ME_RETRY; count > 0; --count) { |
| pci_read_dword_ptr(&hfs, PCI_ME_HFS); |
| if (hfs.bios_msg_ack) |
| break; |
| udelay(ME_DELAY); |
| } |
| if (!count) { |
| printk(BIOS_ERR, "ERROR: ME failed to respond\n"); |
| return -1; |
| } |
| |
| /* Return the requested BIOS action */ |
| printk(BIOS_NOTICE, "ME: Requested BIOS Action: %s\n", |
| me_ack_values[hfs.ack_data]); |
| |
| /* Check status after acknowledgement */ |
| intel_early_me_status(); |
| |
| reset = 0; |
| 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(0); |
| reset = 0x06; |
| break; |
| case ME_HFS_ACK_PWR_CYCLE: |
| /* Power cycle reset */ |
| set_global_reset(0); |
| reset = 0x0e; |
| break; |
| case ME_HFS_ACK_GBL_RESET: |
| /* Global reset */ |
| set_global_reset(1); |
| reset = 0x0e; |
| break; |
| case ME_HFS_ACK_S3: |
| case ME_HFS_ACK_S4: |
| case ME_HFS_ACK_S5: |
| break; |
| } |
| |
| /* Perform the requested reset */ |
| if (reset) { |
| outb(reset, 0xcf9); |
| halt(); |
| } |
| return -1; |
| } |