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/*
* 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 <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(SOC_PSP_DEV, PCI_COMMAND);
pci_write_config32(SOC_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(SOC_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;
}
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