| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #include <bootstate.h> |
| #include <console/console.h> |
| #include <timer.h> |
| #include <amdblocks/psp.h> |
| #include <amdblocks/smn.h> |
| #include "psp_def.h" |
| |
| #define SMN_PSP_PUBLIC_BASE 0x3800000 |
| |
| #define PSP_MAILBOX_COMMAND_OFFSET 0x10570 /* 4 bytes */ |
| #define PSP_MAILBOX_BUFFER_L_OFFSET 0x10574 /* 4 bytes */ |
| #define PSP_MAILBOX_BUFFER_H_OFFSET 0x10578 /* 4 bytes */ |
| |
| #define CORE_2_PSP_MSG_38_OFFSET 0x10998 /* 4 byte */ |
| #define CORE_2_PSP_MSG_38_FUSE_SPL BIT(12) |
| |
| union pspv2_mbox_command { |
| u32 val; |
| struct pspv2_mbox_cmd_fields { |
| u16 mbox_status; |
| u8 mbox_command; |
| u32 reserved:6; |
| u32 recovery:1; |
| u32 ready:1; |
| } __packed fields; |
| }; |
| |
| static u16 rd_mbox_sts(void) |
| { |
| union pspv2_mbox_command tmp; |
| |
| tmp.val = smn_read32(SMN_PSP_PUBLIC_BASE + PSP_MAILBOX_COMMAND_OFFSET); |
| return tmp.fields.mbox_status; |
| } |
| |
| static void wr_mbox_cmd(u8 cmd) |
| { |
| union pspv2_mbox_command tmp = { .val = 0 }; |
| |
| /* Write entire 32-bit area to begin command execution */ |
| tmp.fields.mbox_command = cmd; |
| smn_write32(SMN_PSP_PUBLIC_BASE + PSP_MAILBOX_COMMAND_OFFSET, tmp.val); |
| } |
| |
| static u8 rd_mbox_recovery(void) |
| { |
| union pspv2_mbox_command tmp; |
| |
| tmp.val = smn_read32(SMN_PSP_PUBLIC_BASE + PSP_MAILBOX_COMMAND_OFFSET); |
| return !!tmp.fields.recovery; |
| } |
| |
| static void wr_mbox_buffer_ptr(void *buffer) |
| { |
| const uint32_t buf_addr_h = (uint64_t)(uintptr_t)buffer >> 32; |
| const uint32_t buf_addr_l = (uint64_t)(uintptr_t)buffer & 0xffffffff; |
| smn_write32(SMN_PSP_PUBLIC_BASE + PSP_MAILBOX_BUFFER_H_OFFSET, buf_addr_h); |
| smn_write32(SMN_PSP_PUBLIC_BASE + PSP_MAILBOX_BUFFER_L_OFFSET, buf_addr_l); |
| } |
| |
| static int wait_command(bool wait_for_ready) |
| { |
| union pspv2_mbox_command and_mask = { .val = ~0 }; |
| union pspv2_mbox_command expected = { .val = 0 }; |
| struct stopwatch sw; |
| u32 tmp; |
| |
| /* Zero fields from and_mask that should be kept */ |
| and_mask.fields.mbox_command = 0; |
| and_mask.fields.ready = wait_for_ready ? 0 : 1; |
| |
| /* Expect mbox_cmd == 0 but ready depends */ |
| if (wait_for_ready) |
| expected.fields.ready = 1; |
| |
| stopwatch_init_msecs_expire(&sw, PSP_CMD_TIMEOUT); |
| |
| do { |
| tmp = smn_read32(SMN_PSP_PUBLIC_BASE + PSP_MAILBOX_COMMAND_OFFSET); |
| tmp &= ~and_mask.val; |
| if (tmp == expected.val) |
| return 0; |
| } while (!stopwatch_expired(&sw)); |
| |
| return -PSPSTS_CMD_TIMEOUT; |
| } |
| |
| int send_psp_command(u32 command, void *buffer) |
| { |
| if (rd_mbox_recovery()) |
| return -PSPSTS_RECOVERY; |
| |
| if (wait_command(true)) |
| return -PSPSTS_CMD_TIMEOUT; |
| |
| /* set address of command-response buffer and write command register */ |
| wr_mbox_buffer_ptr(buffer); |
| wr_mbox_cmd(command); |
| |
| /* PSP clears command register when complete. All commands except |
| * SxInfo set the Ready bit. */ |
| if (wait_command(command != MBOX_BIOS_CMD_SX_INFO)) |
| return -PSPSTS_CMD_TIMEOUT; |
| |
| /* check delivery status */ |
| if (rd_mbox_sts()) |
| return -PSPSTS_SEND_ERROR; |
| |
| return 0; |
| } |
| |
| enum cb_err soc_read_c2p38(uint32_t *msg_38_value) |
| { |
| *msg_38_value = smn_read32(SMN_PSP_PUBLIC_BASE + CORE_2_PSP_MSG_38_OFFSET); |
| return CB_SUCCESS; |
| } |
| |
| static void psp_set_spl_fuse(void *unused) |
| { |
| if (!CONFIG(SOC_AMD_COMMON_BLOCK_PSP_FUSE_SPL)) |
| return; |
| |
| uint32_t msg_38_value = 0; |
| int cmd_status = 0; |
| struct mbox_cmd_late_spl_buffer buffer = { |
| .header = { |
| .size = sizeof(buffer) |
| } |
| }; |
| |
| if (soc_read_c2p38(&msg_38_value) != CB_SUCCESS) { |
| printk(BIOS_ERR, "PSP: Failed to read psp base address.\n"); |
| return; |
| } |
| |
| if (msg_38_value & CORE_2_PSP_MSG_38_FUSE_SPL) { |
| printk(BIOS_DEBUG, "PSP: Fuse SPL requested\n"); |
| cmd_status = send_psp_command(MBOX_BIOS_CMD_SET_SPL_FUSE, &buffer); |
| psp_print_cmd_status(cmd_status, NULL); |
| } else { |
| printk(BIOS_DEBUG, "PSP: Fuse SPL not requested\n"); |
| } |
| } |
| |
| BOOT_STATE_INIT_ENTRY(BS_PAYLOAD_BOOT, BS_ON_ENTRY, psp_set_spl_fuse, NULL); |