diff options
Diffstat (limited to 'chip/ish/system_state_subsys.c')
| -rw-r--r-- | chip/ish/system_state_subsys.c | 175 |
1 files changed, 0 insertions, 175 deletions
diff --git a/chip/ish/system_state_subsys.c b/chip/ish/system_state_subsys.c deleted file mode 100644 index 36b79c747a..0000000000 --- a/chip/ish/system_state_subsys.c +++ /dev/null @@ -1,175 +0,0 @@ -/* Copyright 2018 The Chromium OS Authors. All rights reserved. - * Use of this source code is governed by a BSD-style license that can be - * found in the LICENSE file. - */ - -#include "heci_client.h" -#include "registers.h" -#include "system_state.h" -#include "console.h" - -#ifdef SS_SUBSYSTEM_DEBUG -#define CPUTS(outstr) cputs(CC_LPC, outstr) -#define CPRINTS(format, args...) cprints(CC_LPC, format, ## args) -#define CPRINTF(format, args...) cprintf(CC_LPC, format, ## args) -#else -#define CPUTS(outstr) -#define CPRINTS(format, args...) -#define CPRINTF(format, args...) -#endif - - -/* the following "define"s and structures are from host driver - * and they are slightly modified for look&feel purpose. - */ -#define SYSTEM_STATE_SUBSCRIBE 0x1 -#define SYSTEM_STATE_STATUS 0x2 -#define SYSTEM_STATE_QUERY_SUBSCRIBERS 0x3 -#define SYSTEM_STATE_STATE_CHANGE_REQ 0x4 - -#define SUSPEND_STATE_BIT BIT(1) /* suspend/resume */ - -/* Cached state of ISH's requested power rails when AP suspends */ -static uint32_t cached_vnn_request; - -struct ss_header { - uint32_t cmd; - uint32_t cmd_status; -} __packed; - -struct ss_query_subscribers { - struct ss_header hdr; -} __packed; - -struct ss_subscribe { - struct ss_header hdr; - uint32_t states; -} __packed; - -struct ss_status { - struct ss_header hdr; - uint32_t supported_states; - uint32_t states_status; -} __packed; - -/* change request from device but host doesn't support it */ -struct ss_state_change_req { - struct ss_header hdr; - uint32_t requested_states; - uint32_t states_status; -} __packed; - -/* - * TODO: For now, every HECI client with valid .suspend or .resume callback is - * automatically registered as client of system state subsystem. - * so MAX_SS_CLIENTS should be HECI_MAX_NUM_OF_CLIENTS. - * if an object wants to get system state event then it can embeds - * "struct ss_subsys_device" in it and calls ss_subsys_register_client() like - * HECI client. - */ -#define MAX_SS_CLIENTS HECI_MAX_NUM_OF_CLIENTS - -struct ss_subsystem_context { - uint32_t registered_state; - - int num_of_ss_client; - struct ss_subsys_device *clients[MAX_SS_CLIENTS]; -}; - -static struct ss_subsystem_context ss_subsys_ctx; - -int ss_subsys_register_client(struct ss_subsys_device *ss_device) -{ - int handle; - - if (ss_subsys_ctx.num_of_ss_client == MAX_SS_CLIENTS) - return -1; - - if (ss_device->cbs->resume || ss_device->cbs->suspend) { - handle = ss_subsys_ctx.num_of_ss_client++; - ss_subsys_ctx.registered_state |= SUSPEND_STATE_BIT; - ss_subsys_ctx.clients[handle] = ss_device; - } else { - return -1; - } - - return handle; -} - -static int ss_subsys_suspend(void) -{ - int i; - - for (i = ss_subsys_ctx.num_of_ss_client - 1; i >= 0; i--) { - if (ss_subsys_ctx.clients[i]->cbs->suspend) - ss_subsys_ctx.clients[i]->cbs->suspend( - ss_subsys_ctx.clients[i]); - } - - /* - * PMU_VNN_REQ is used by ISH FW to assert power requirements of ISH to - * PMC. The system won't enter S0ix if ISH is requesting any power - * rails. Setting a bit to 1 both sets and clears a requested value. - * Cache the value of request power so we can restore it on resume. - */ - if (IS_ENABLED(CHIP_FAMILY_ISH5)) { - cached_vnn_request = PMU_VNN_REQ; - PMU_VNN_REQ = cached_vnn_request; - } - return EC_SUCCESS; -} - -static int ss_subsys_resume(void) -{ - int i; - - /* - * Restore VNN power request from before suspend. - */ - if (IS_ENABLED(CHIP_FAMILY_ISH5) && - cached_vnn_request) { - /* Request all cached power rails that are not already on. */ - PMU_VNN_REQ = cached_vnn_request & ~PMU_VNN_REQ; - /* Wait for power request to get acknowledged */ - while (!(PMU_VNN_REQ_ACK & PMU_VNN_REQ_ACK_STATUS)) - continue; - } - - for (i = 0; i < ss_subsys_ctx.num_of_ss_client; i++) { - if (ss_subsys_ctx.clients[i]->cbs->resume) - ss_subsys_ctx.clients[i]->cbs->resume( - ss_subsys_ctx.clients[i]); - } - - return EC_SUCCESS; -} - -void heci_handle_system_state_msg(uint8_t *msg, const size_t length) -{ - struct ss_header *hdr = (struct ss_header *)msg; - struct ss_subscribe subscribe; - struct ss_status *status; - - switch (hdr->cmd) { - case SYSTEM_STATE_QUERY_SUBSCRIBERS: - subscribe.hdr.cmd = SYSTEM_STATE_SUBSCRIBE; - subscribe.hdr.cmd_status = 0; - subscribe.states = ss_subsys_ctx.registered_state; - - heci_send_fixed_client_msg(HECI_FIXED_SYSTEM_STATE_ADDR, - (uint8_t *)&subscribe, - sizeof(subscribe)); - - break; - case SYSTEM_STATE_STATUS: - status = (struct ss_status *)msg; - if (status->supported_states & SUSPEND_STATE_BIT) { - if (status->states_status & SUSPEND_STATE_BIT) - ss_subsys_suspend(); - else - ss_subsys_resume(); - } - - break; - } -} |