forked from Mirrors/opensbi
8d8cc9507b
These drivers were merged on an experimental basis without the RPMI specification being frozen. As a result, they may not be compatible with the frozen version of the RPMI protocol. Additionally, their devicetree bindings have not been reviewed and are subject to change. Warn the user that these drivers make no compatibility guarantees, and that their behavior and devicetree bindings may change incompatibly in future versions of OpenSBI. Signed-off-by: Samuel Holland <samuel.holland@sifive.com> Reviewed-by: Anup Patel <anup@brainfault.org>
143 lines
3.2 KiB
C
143 lines
3.2 KiB
C
/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2024 Ventana Micro Systems Inc.
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*
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* Authors:
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* Rahul Pathak <rpathak@ventanamicro.com>
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*/
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#include <sbi/sbi_error.h>
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#include <sbi/sbi_system.h>
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#include <sbi/sbi_console.h>
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#include <sbi_utils/fdt/fdt_helper.h>
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#include <sbi_utils/reset/fdt_reset.h>
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#include <sbi_utils/mailbox/fdt_mailbox.h>
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#include <sbi_utils/mailbox/rpmi_msgprot.h>
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#include <sbi_utils/mailbox/rpmi_mailbox.h>
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/* struct rpmi_sysreset: RPMI System Reset Context */
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struct rpmi_sysreset {
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int warm_reset_support;
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struct mbox_chan *chan;
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};
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static struct rpmi_sysreset sysreset_ctx;
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static int rpmi_system_reset_type_check(u32 reset_type)
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{
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int ret;
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struct rpmi_sysrst_get_reset_attributes_resp resp;
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ret = rpmi_normal_request_with_status(sysreset_ctx.chan,
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RPMI_SYSRST_SRV_GET_ATTRIBUTES, &reset_type,
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rpmi_u32_count(reset_type), rpmi_u32_count(reset_type),
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&resp, rpmi_u32_count(resp), rpmi_u32_count(resp));
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if (ret) {
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return 0;
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}
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return (resp.flags & RPMI_SYSRST_ATTRS_FLAGS_RESETTYPE_MASK) ? 1 : 0;
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}
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/**
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* rpmi_do_system_reset: Do system reset
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*
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* @reset_type: RPMI System Reset Type
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*/
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static void rpmi_do_system_reset(u32 reset_type)
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{
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int ret;
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ret = rpmi_posted_request(sysreset_ctx.chan,
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RPMI_SYSRST_SRV_SYSTEM_RESET,
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&reset_type, rpmi_u32_count(reset_type),
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rpmi_u32_count(reset_type));
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if (ret)
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sbi_printf("system reset failed [type: %d]: ret: %d\n",
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reset_type, ret);
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}
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/**
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* rpmi_system_reset_check: Check the support for
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* various reset types
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*
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* @type: SBI System Reset Type
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* @reason: Reason for system reset
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*/
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static int rpmi_system_reset_check(u32 type, u32 reason)
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{
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switch (type) {
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case SBI_SRST_RESET_TYPE_SHUTDOWN:
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case SBI_SRST_RESET_TYPE_COLD_REBOOT:
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return 1;
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case SBI_SRST_RESET_TYPE_WARM_REBOOT:
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return sysreset_ctx.warm_reset_support;
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default:
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return 0;
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}
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}
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static void rpmi_system_reset(u32 type, u32 reason)
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{
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u32 reset_type;
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switch (type) {
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case SBI_SRST_RESET_TYPE_SHUTDOWN:
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reset_type = RPMI_SYSRST_TYPE_SHUTDOWN;
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break;
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case SBI_SRST_RESET_TYPE_COLD_REBOOT:
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reset_type = RPMI_SYSRST_TYPE_COLD_REBOOT;
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break;
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case SBI_SRST_RESET_TYPE_WARM_REBOOT:
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reset_type = RPMI_SYSRST_TYPE_WARM_REBOOT;
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break;
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default:
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return;
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}
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rpmi_do_system_reset(reset_type);
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}
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static struct sbi_system_reset_device rpmi_reset_dev = {
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.name = "rpmi-system-reset",
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.system_reset_check = rpmi_system_reset_check,
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.system_reset = rpmi_system_reset,
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};
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static int rpmi_reset_init(const void *fdt, int nodeoff,
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const struct fdt_match *match)
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{
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int ret;
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/* If channel already available then do nothing. */
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if (sysreset_ctx.chan)
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return 0;
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/*
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* If channel request failed then other end does not support
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* system reset group so do nothing.
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*/
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ret = fdt_mailbox_request_chan(fdt, nodeoff, 0, &sysreset_ctx.chan);
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if (ret)
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return SBI_ENODEV;
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sysreset_ctx.warm_reset_support =
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rpmi_system_reset_type_check(RPMI_SYSRST_TYPE_WARM_REBOOT);
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sbi_system_reset_add_device(&rpmi_reset_dev);
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return SBI_OK;
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}
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static const struct fdt_match rpmi_reset_match[] = {
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{ .compatible = "riscv,rpmi-system-reset" },
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{},
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};
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struct fdt_driver fdt_reset_rpmi = {
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.match_table = rpmi_reset_match,
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.init = rpmi_reset_init,
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.experimental = true,
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};
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