mirror of
https://github.com/riscv-software-src/opensbi.git
synced 2025-08-24 23:41:23 +01:00

Add RPMI based driver for system reset and enable it in the generic platform defconfig Signed-off-by: Rahul Pathak <rpathak@ventanamicro.com> Signed-off-by: Anup Patel <apatel@ventanamicro.com>
142 lines
3.2 KiB
C
142 lines
3.2 KiB
C
/*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*
|
|
* Copyright (c) 2024 Ventana Micro Systems Inc.
|
|
*
|
|
* Authors:
|
|
* Rahul Pathak <rpathak@ventanamicro.com>
|
|
*/
|
|
|
|
#include <sbi/sbi_error.h>
|
|
#include <sbi/sbi_system.h>
|
|
#include <sbi/sbi_console.h>
|
|
#include <sbi_utils/fdt/fdt_helper.h>
|
|
#include <sbi_utils/reset/fdt_reset.h>
|
|
#include <sbi_utils/mailbox/fdt_mailbox.h>
|
|
#include <sbi_utils/mailbox/rpmi_msgprot.h>
|
|
#include <sbi_utils/mailbox/rpmi_mailbox.h>
|
|
|
|
/* struct rpmi_sysreset: RPMI System Reset Context */
|
|
struct rpmi_sysreset {
|
|
int warm_reset_support;
|
|
struct mbox_chan *chan;
|
|
};
|
|
|
|
static struct rpmi_sysreset sysreset_ctx;
|
|
|
|
static int rpmi_system_reset_type_check(u32 reset_type)
|
|
{
|
|
int ret;
|
|
struct rpmi_sysrst_get_reset_attributes_resp resp;
|
|
|
|
ret = rpmi_normal_request_with_status(sysreset_ctx.chan,
|
|
RPMI_SYSRST_SRV_GET_ATTRIBUTES, &reset_type,
|
|
rpmi_u32_count(reset_type), rpmi_u32_count(reset_type),
|
|
&resp, rpmi_u32_count(resp), rpmi_u32_count(resp));
|
|
if (ret) {
|
|
return 0;
|
|
}
|
|
|
|
return (resp.flags & RPMI_SYSRST_ATTRS_FLAGS_RESETTYPE_MASK) ? 1 : 0;
|
|
}
|
|
|
|
/**
|
|
* rpmi_do_system_reset: Do system reset
|
|
*
|
|
* @reset_type: RPMI System Reset Type
|
|
*/
|
|
static void rpmi_do_system_reset(u32 reset_type)
|
|
{
|
|
int ret;
|
|
|
|
ret = rpmi_posted_request(sysreset_ctx.chan,
|
|
RPMI_SYSRST_SRV_SYSTEM_RESET,
|
|
&reset_type, rpmi_u32_count(reset_type),
|
|
rpmi_u32_count(reset_type));
|
|
if (ret)
|
|
sbi_printf("system reset failed [type: %d]: ret: %d\n",
|
|
reset_type, ret);
|
|
}
|
|
|
|
/**
|
|
* rpmi_system_reset_check: Check the support for
|
|
* various reset types
|
|
*
|
|
* @type: SBI System Reset Type
|
|
* @reason: Reason for system reset
|
|
*/
|
|
static int rpmi_system_reset_check(u32 type, u32 reason)
|
|
{
|
|
switch (type) {
|
|
case SBI_SRST_RESET_TYPE_SHUTDOWN:
|
|
case SBI_SRST_RESET_TYPE_COLD_REBOOT:
|
|
return 1;
|
|
case SBI_SRST_RESET_TYPE_WARM_REBOOT:
|
|
return sysreset_ctx.warm_reset_support;
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
static void rpmi_system_reset(u32 type, u32 reason)
|
|
{
|
|
u32 reset_type;
|
|
|
|
switch (type) {
|
|
case SBI_SRST_RESET_TYPE_SHUTDOWN:
|
|
reset_type = RPMI_SYSRST_TYPE_SHUTDOWN;
|
|
break;
|
|
case SBI_SRST_RESET_TYPE_COLD_REBOOT:
|
|
reset_type = RPMI_SYSRST_TYPE_COLD_REBOOT;
|
|
break;
|
|
case SBI_SRST_RESET_TYPE_WARM_REBOOT:
|
|
reset_type = RPMI_SYSRST_TYPE_WARM_REBOOT;
|
|
break;
|
|
default:
|
|
return;
|
|
}
|
|
|
|
rpmi_do_system_reset(reset_type);
|
|
}
|
|
|
|
static struct sbi_system_reset_device rpmi_reset_dev = {
|
|
.name = "rpmi-system-reset",
|
|
.system_reset_check = rpmi_system_reset_check,
|
|
.system_reset = rpmi_system_reset,
|
|
};
|
|
|
|
static int rpmi_reset_init(const void *fdt, int nodeoff,
|
|
const struct fdt_match *match)
|
|
{
|
|
int ret;
|
|
|
|
/* If channel already available then do nothing. */
|
|
if (sysreset_ctx.chan)
|
|
return 0;
|
|
|
|
/*
|
|
* If channel request failed then other end does not support
|
|
* system reset group so do nothing.
|
|
*/
|
|
ret = fdt_mailbox_request_chan(fdt, nodeoff, 0, &sysreset_ctx.chan);
|
|
if (ret)
|
|
return SBI_ENODEV;
|
|
|
|
sysreset_ctx.warm_reset_support =
|
|
rpmi_system_reset_type_check(RPMI_SYSRST_TYPE_WARM_REBOOT);
|
|
|
|
sbi_system_reset_add_device(&rpmi_reset_dev);
|
|
|
|
return SBI_OK;
|
|
}
|
|
|
|
static const struct fdt_match rpmi_reset_match[] = {
|
|
{ .compatible = "riscv,rpmi-system-reset" },
|
|
{},
|
|
};
|
|
|
|
struct fdt_driver fdt_reset_rpmi = {
|
|
.match_table = rpmi_reset_match,
|
|
.init = rpmi_reset_init,
|
|
};
|