Marshall Dawson | 68243a5 | 2017-06-15 16:59:20 -0600 | [diff] [blame^] | 1 | /* |
| 2 | * This file is part of the coreboot project. |
| 3 | * |
| 4 | * Copyright (C) 2017 Advanced Micro Devices, Inc. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; version 2 of the License. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | */ |
| 15 | |
| 16 | #include <arch/io.h> |
| 17 | #include <delay.h> |
| 18 | #include <cbmem.h> |
| 19 | #include <timer.h> |
| 20 | #include <device/pci_def.h> |
| 21 | #include <console/console.h> |
| 22 | #include <amdblocks/psp.h> |
| 23 | |
| 24 | static const char *psp_status_nobase = "error: PSP BAR3 not assigned"; |
| 25 | static const char *psp_status_halted = "error: PSP in halted state"; |
| 26 | static const char *psp_status_recovery = "error: PSP recovery required"; |
| 27 | static const char *psp_status_errcmd = "error sending command"; |
| 28 | static const char *psp_status_init_timeout = "error: PSP init timeout"; |
| 29 | static const char *psp_status_cmd_timeout = "error: PSP command timeout"; |
| 30 | static const char *psp_status_noerror = ""; |
| 31 | |
| 32 | static const char *status_to_string(int err) |
| 33 | { |
| 34 | switch (err) { |
| 35 | case -PSPSTS_NOBASE: |
| 36 | return psp_status_nobase; |
| 37 | case -PSPSTS_HALTED: |
| 38 | return psp_status_halted; |
| 39 | case -PSPSTS_RECOVERY: |
| 40 | return psp_status_recovery; |
| 41 | case -PSPSTS_SEND_ERROR: |
| 42 | return psp_status_errcmd; |
| 43 | case -PSPSTS_INIT_TIMEOUT: |
| 44 | return psp_status_init_timeout; |
| 45 | case -PSPSTS_CMD_TIMEOUT: |
| 46 | return psp_status_cmd_timeout; |
| 47 | default: |
| 48 | return psp_status_noerror; |
| 49 | } |
| 50 | } |
| 51 | |
| 52 | static struct psp_mbox *get_mbox_address(void) |
| 53 | { |
| 54 | UINT32 base; /* UINT32 for compatibility with PspBaseLib */ |
| 55 | BOOLEAN bar3_status; |
| 56 | uintptr_t baseptr; |
| 57 | |
| 58 | bar3_status = GetPspBar3Addr(&base); |
| 59 | if (!bar3_status) { |
| 60 | PspBarInitEarly(); |
| 61 | bar3_status = GetPspBar3Addr(&base); |
| 62 | } |
| 63 | if (!bar3_status) |
| 64 | return NULL; |
| 65 | |
| 66 | baseptr = base; |
| 67 | return (struct psp_mbox *)(baseptr + PSP_MAILBOX_BASE); |
| 68 | } |
| 69 | |
| 70 | static u32 rd_mbox_sts(struct psp_mbox *mbox) |
| 71 | { |
| 72 | return read32(&mbox->mbox_status); |
| 73 | } |
| 74 | |
| 75 | static void wr_mbox_cmd(struct psp_mbox *mbox, u32 cmd) |
| 76 | { |
| 77 | write32(&mbox->mbox_command, cmd); |
| 78 | } |
| 79 | |
| 80 | static u32 rd_mbox_cmd(struct psp_mbox *mbox) |
| 81 | { |
| 82 | return read32(&mbox->mbox_command); |
| 83 | } |
| 84 | |
| 85 | static void wr_mbox_cmd_resp(struct psp_mbox *mbox, void *buffer) |
| 86 | { |
| 87 | write64(&mbox->cmd_response, (uintptr_t)buffer); |
| 88 | } |
| 89 | |
| 90 | static u32 rd_resp_sts(struct mbox_default_buffer *buffer) |
| 91 | { |
| 92 | return read32(&buffer->header.status); |
| 93 | } |
| 94 | |
| 95 | static int wait_initialized(struct psp_mbox *mbox) |
| 96 | { |
| 97 | struct stopwatch sw; |
| 98 | |
| 99 | stopwatch_init_msecs_expire(&sw, PSP_INIT_TIMEOUT); |
| 100 | |
| 101 | do { |
| 102 | if (rd_mbox_sts(mbox) & STATUS_INITIALIZED) |
| 103 | return 0; |
| 104 | } while (!stopwatch_expired(&sw)); |
| 105 | |
| 106 | return -PSPSTS_INIT_TIMEOUT; |
| 107 | } |
| 108 | |
| 109 | static int wait_command(struct psp_mbox *mbox) |
| 110 | { |
| 111 | struct stopwatch sw; |
| 112 | |
| 113 | stopwatch_init_msecs_expire(&sw, PSP_CMD_TIMEOUT); |
| 114 | |
| 115 | do { |
| 116 | if (!rd_mbox_cmd(mbox)) |
| 117 | return 0; |
| 118 | } while (!stopwatch_expired(&sw)); |
| 119 | |
| 120 | return -PSPSTS_CMD_TIMEOUT; |
| 121 | } |
| 122 | |
| 123 | static int send_psp_command(u32 command, void *buffer) |
| 124 | { |
| 125 | u32 command_reg; |
| 126 | int status = 0; |
| 127 | |
| 128 | struct psp_mbox *mbox = get_mbox_address(); |
| 129 | if (!mbox) |
| 130 | return -PSPSTS_NOBASE; |
| 131 | |
| 132 | command_reg = pci_read_config32(PSP_DEV, PCI_COMMAND); |
| 133 | pci_write_config32(PSP_DEV, PCI_COMMAND, command_reg | |
| 134 | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER); |
| 135 | |
| 136 | /* check for PSP error conditions */ |
| 137 | if (rd_mbox_sts(mbox) & STATUS_HALT) { |
| 138 | status = -PSPSTS_HALTED; |
| 139 | goto exit; |
| 140 | } |
| 141 | if (rd_mbox_sts(mbox) & STATUS_RECOVERY) { |
| 142 | status = -PSPSTS_RECOVERY; |
| 143 | goto exit; |
| 144 | } |
| 145 | |
| 146 | /* PSP must be finished with init and ready to accept a command */ |
| 147 | if (wait_initialized(mbox)) { |
| 148 | status = -PSPSTS_INIT_TIMEOUT; |
| 149 | goto exit; |
| 150 | } |
| 151 | if (wait_command(mbox)) { |
| 152 | status = -PSPSTS_CMD_TIMEOUT; |
| 153 | goto exit; |
| 154 | } |
| 155 | |
| 156 | /* set address of command-response buffer and write command register */ |
| 157 | wr_mbox_cmd_resp(mbox, buffer); |
| 158 | wr_mbox_cmd(mbox, command); |
| 159 | |
| 160 | /* PSP clears command register when complete */ |
| 161 | if (wait_command(mbox)) { |
| 162 | status = -PSPSTS_CMD_TIMEOUT; |
| 163 | goto exit; |
| 164 | } |
| 165 | |
| 166 | /* check delivery status */ |
| 167 | if (rd_mbox_sts(mbox) & (STATUS_ERROR | STATUS_TERMINATED)) { |
| 168 | status = -PSPSTS_SEND_ERROR; |
| 169 | goto exit; |
| 170 | } |
| 171 | exit: |
| 172 | /* restore command register to original value */ |
| 173 | pci_write_config32(PSP_DEV, PCI_COMMAND, command_reg); |
| 174 | return status; |
| 175 | } |
| 176 | |
| 177 | /* |
| 178 | * Notify the PSP that DRAM is present. Upon receiving this command, the PSP |
| 179 | * will load its OS into fenced DRAM that is not accessible to the x86 cores. |
| 180 | */ |
| 181 | int psp_notify_dram(void) |
| 182 | { |
| 183 | struct mbox_default_buffer buffer; |
| 184 | int cmd_status; |
| 185 | |
| 186 | printk(BIOS_DEBUG, "PSP: Notify that DRAM is available... "); |
| 187 | |
| 188 | buffer.header.size = sizeof(struct mbox_default_buffer); |
| 189 | buffer.header.status = 0; /* PSP does not report status for this cmd */ |
| 190 | |
| 191 | cmd_status = send_psp_command(MBOX_BIOS_CMD_DRAM_INFO, &buffer); |
| 192 | |
| 193 | /* buffer's status shouldn't change but report it if it does */ |
| 194 | if (rd_resp_sts(&buffer)) |
| 195 | printk(BIOS_DEBUG, "buffer status=0x%x ", |
| 196 | rd_resp_sts(&buffer)); |
| 197 | if (cmd_status) |
| 198 | printk(BIOS_DEBUG, "%s\n", status_to_string(cmd_status)); |
| 199 | else |
| 200 | printk(BIOS_DEBUG, "OK\n"); |
| 201 | |
| 202 | return cmd_status; |
| 203 | } |