diff options
Diffstat (limited to 'src/soc/amd/common/block/psp/psp.c')
-rw-r--r-- | src/soc/amd/common/block/psp/psp.c | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/src/soc/amd/common/block/psp/psp.c b/src/soc/amd/common/block/psp/psp.c new file mode 100644 index 0000000000..d61a9147dc --- /dev/null +++ b/src/soc/amd/common/block/psp/psp.c @@ -0,0 +1,203 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2017 Advanced Micro Devices, Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <arch/io.h> +#include <delay.h> +#include <cbmem.h> +#include <timer.h> +#include <device/pci_def.h> +#include <console/console.h> +#include <amdblocks/psp.h> + +static const char *psp_status_nobase = "error: PSP BAR3 not assigned"; +static const char *psp_status_halted = "error: PSP in halted state"; +static const char *psp_status_recovery = "error: PSP recovery required"; +static const char *psp_status_errcmd = "error sending command"; +static const char *psp_status_init_timeout = "error: PSP init timeout"; +static const char *psp_status_cmd_timeout = "error: PSP command timeout"; +static const char *psp_status_noerror = ""; + +static const char *status_to_string(int err) +{ + switch (err) { + case -PSPSTS_NOBASE: + return psp_status_nobase; + case -PSPSTS_HALTED: + return psp_status_halted; + case -PSPSTS_RECOVERY: + return psp_status_recovery; + case -PSPSTS_SEND_ERROR: + return psp_status_errcmd; + case -PSPSTS_INIT_TIMEOUT: + return psp_status_init_timeout; + case -PSPSTS_CMD_TIMEOUT: + return psp_status_cmd_timeout; + default: + return psp_status_noerror; + } +} + +static struct psp_mbox *get_mbox_address(void) +{ + UINT32 base; /* UINT32 for compatibility with PspBaseLib */ + BOOLEAN bar3_status; + uintptr_t baseptr; + + bar3_status = GetPspBar3Addr(&base); + if (!bar3_status) { + PspBarInitEarly(); + bar3_status = GetPspBar3Addr(&base); + } + if (!bar3_status) + return NULL; + + baseptr = base; + return (struct psp_mbox *)(baseptr + PSP_MAILBOX_BASE); +} + +static u32 rd_mbox_sts(struct psp_mbox *mbox) +{ + return read32(&mbox->mbox_status); +} + +static void wr_mbox_cmd(struct psp_mbox *mbox, u32 cmd) +{ + write32(&mbox->mbox_command, cmd); +} + +static u32 rd_mbox_cmd(struct psp_mbox *mbox) +{ + return read32(&mbox->mbox_command); +} + +static void wr_mbox_cmd_resp(struct psp_mbox *mbox, void *buffer) +{ + write64(&mbox->cmd_response, (uintptr_t)buffer); +} + +static u32 rd_resp_sts(struct mbox_default_buffer *buffer) +{ + return read32(&buffer->header.status); +} + +static int wait_initialized(struct psp_mbox *mbox) +{ + struct stopwatch sw; + + stopwatch_init_msecs_expire(&sw, PSP_INIT_TIMEOUT); + + do { + if (rd_mbox_sts(mbox) & STATUS_INITIALIZED) + return 0; + } while (!stopwatch_expired(&sw)); + + return -PSPSTS_INIT_TIMEOUT; +} + +static int wait_command(struct psp_mbox *mbox) +{ + struct stopwatch sw; + + stopwatch_init_msecs_expire(&sw, PSP_CMD_TIMEOUT); + + do { + if (!rd_mbox_cmd(mbox)) + return 0; + } while (!stopwatch_expired(&sw)); + + return -PSPSTS_CMD_TIMEOUT; +} + +static int send_psp_command(u32 command, void *buffer) +{ + u32 command_reg; + int status = 0; + + struct psp_mbox *mbox = get_mbox_address(); + if (!mbox) + return -PSPSTS_NOBASE; + + command_reg = pci_read_config32(PSP_DEV, PCI_COMMAND); + pci_write_config32(PSP_DEV, PCI_COMMAND, command_reg | + PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER); + + /* check for PSP error conditions */ + if (rd_mbox_sts(mbox) & STATUS_HALT) { + status = -PSPSTS_HALTED; + goto exit; + } + if (rd_mbox_sts(mbox) & STATUS_RECOVERY) { + status = -PSPSTS_RECOVERY; + goto exit; + } + + /* PSP must be finished with init and ready to accept a command */ + if (wait_initialized(mbox)) { + status = -PSPSTS_INIT_TIMEOUT; + goto exit; + } + if (wait_command(mbox)) { + status = -PSPSTS_CMD_TIMEOUT; + goto exit; + } + + /* set address of command-response buffer and write command register */ + wr_mbox_cmd_resp(mbox, buffer); + wr_mbox_cmd(mbox, command); + + /* PSP clears command register when complete */ + if (wait_command(mbox)) { + status = -PSPSTS_CMD_TIMEOUT; + goto exit; + } + + /* check delivery status */ + if (rd_mbox_sts(mbox) & (STATUS_ERROR | STATUS_TERMINATED)) { + status = -PSPSTS_SEND_ERROR; + goto exit; + } +exit: + /* restore command register to original value */ + pci_write_config32(PSP_DEV, PCI_COMMAND, command_reg); + return status; +} + +/* + * Notify the PSP that DRAM is present. Upon receiving this command, the PSP + * will load its OS into fenced DRAM that is not accessible to the x86 cores. + */ +int psp_notify_dram(void) +{ + struct mbox_default_buffer buffer; + int cmd_status; + + printk(BIOS_DEBUG, "PSP: Notify that DRAM is available... "); + + buffer.header.size = sizeof(struct mbox_default_buffer); + buffer.header.status = 0; /* PSP does not report status for this cmd */ + + cmd_status = send_psp_command(MBOX_BIOS_CMD_DRAM_INFO, &buffer); + + /* buffer's status shouldn't change but report it if it does */ + if (rd_resp_sts(&buffer)) + printk(BIOS_DEBUG, "buffer status=0x%x ", + rd_resp_sts(&buffer)); + if (cmd_status) + printk(BIOS_DEBUG, "%s\n", status_to_string(cmd_status)); + else + printk(BIOS_DEBUG, "OK\n"); + + return cmd_status; +} |