mirror of https://gitee.com/openkylin/linux.git
991 lines
26 KiB
C
991 lines
26 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* ISHTP bus layer messages handling
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*
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* Copyright (c) 2003-2016, Intel Corporation.
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*/
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#include <linux/export.h>
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#include <linux/slab.h>
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#include <linux/sched.h>
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#include <linux/wait.h>
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#include <linux/spinlock.h>
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#include "ishtp-dev.h"
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#include "hbm.h"
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#include "client.h"
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/**
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* ishtp_hbm_fw_cl_allocate() - Allocate FW clients
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* @dev: ISHTP device instance
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*
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* Allocates storage for fw clients
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*/
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static void ishtp_hbm_fw_cl_allocate(struct ishtp_device *dev)
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{
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struct ishtp_fw_client *clients;
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int b;
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/* count how many ISH clients we have */
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for_each_set_bit(b, dev->fw_clients_map, ISHTP_CLIENTS_MAX)
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dev->fw_clients_num++;
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if (dev->fw_clients_num <= 0)
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return;
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/* allocate storage for fw clients representation */
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clients = kcalloc(dev->fw_clients_num, sizeof(struct ishtp_fw_client),
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GFP_KERNEL);
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if (!clients) {
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dev->dev_state = ISHTP_DEV_RESETTING;
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ish_hw_reset(dev);
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return;
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}
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dev->fw_clients = clients;
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}
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/**
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* ishtp_hbm_cl_hdr() - construct client hbm header
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* @cl: client
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* @hbm_cmd: host bus message command
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* @buf: buffer for cl header
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* @len: buffer length
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*
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* Initialize HBM buffer
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*/
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static inline void ishtp_hbm_cl_hdr(struct ishtp_cl *cl, uint8_t hbm_cmd,
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void *buf, size_t len)
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{
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struct ishtp_hbm_cl_cmd *cmd = buf;
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memset(cmd, 0, len);
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cmd->hbm_cmd = hbm_cmd;
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cmd->host_addr = cl->host_client_id;
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cmd->fw_addr = cl->fw_client_id;
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}
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/**
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* ishtp_hbm_cl_addr_equal() - Compare client address
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* @cl: client
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* @buf: Client command buffer
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*
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* Compare client address with the address in command buffer
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*
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* Return: True if they have the same address
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*/
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static inline bool ishtp_hbm_cl_addr_equal(struct ishtp_cl *cl, void *buf)
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{
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struct ishtp_hbm_cl_cmd *cmd = buf;
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return cl->host_client_id == cmd->host_addr &&
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cl->fw_client_id == cmd->fw_addr;
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}
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/**
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* ishtp_hbm_start_wait() - Wait for HBM start message
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* @dev: ISHTP device instance
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*
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* Wait for HBM start message from firmware
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*
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* Return: 0 if HBM start is/was received else timeout error
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*/
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int ishtp_hbm_start_wait(struct ishtp_device *dev)
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{
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int ret;
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if (dev->hbm_state > ISHTP_HBM_START)
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return 0;
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dev_dbg(dev->devc, "Going to wait for ishtp start. hbm_state=%08X\n",
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dev->hbm_state);
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ret = wait_event_interruptible_timeout(dev->wait_hbm_recvd_msg,
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dev->hbm_state >= ISHTP_HBM_STARTED,
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(ISHTP_INTEROP_TIMEOUT * HZ));
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dev_dbg(dev->devc,
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"Woke up from waiting for ishtp start. hbm_state=%08X\n",
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dev->hbm_state);
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if (ret <= 0 && (dev->hbm_state <= ISHTP_HBM_START)) {
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dev->hbm_state = ISHTP_HBM_IDLE;
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dev_err(dev->devc,
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"waiting for ishtp start failed. ret=%d hbm_state=%08X\n",
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ret, dev->hbm_state);
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return -ETIMEDOUT;
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}
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return 0;
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}
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/**
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* ishtp_hbm_start_req() - Send HBM start message
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* @dev: ISHTP device instance
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*
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* Send HBM start message to firmware
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*
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* Return: 0 if success else error code
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*/
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int ishtp_hbm_start_req(struct ishtp_device *dev)
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{
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struct ishtp_msg_hdr hdr;
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struct hbm_host_version_request start_req = { 0 };
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ishtp_hbm_hdr(&hdr, sizeof(start_req));
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/* host start message */
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start_req.hbm_cmd = HOST_START_REQ_CMD;
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start_req.host_version.major_version = HBM_MAJOR_VERSION;
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start_req.host_version.minor_version = HBM_MINOR_VERSION;
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/*
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* (!) Response to HBM start may be so quick that this thread would get
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* preempted BEFORE managing to set hbm_state = ISHTP_HBM_START.
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* So set it at first, change back to ISHTP_HBM_IDLE upon failure
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*/
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dev->hbm_state = ISHTP_HBM_START;
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if (ishtp_write_message(dev, &hdr, &start_req)) {
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dev_err(dev->devc, "version message send failed\n");
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dev->dev_state = ISHTP_DEV_RESETTING;
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dev->hbm_state = ISHTP_HBM_IDLE;
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ish_hw_reset(dev);
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return -ENODEV;
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}
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return 0;
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}
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/**
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* ishtp_hbm_enum_clients_req() - Send client enum req
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* @dev: ISHTP device instance
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*
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* Send enumeration client request message
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*
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* Return: 0 if success else error code
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*/
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void ishtp_hbm_enum_clients_req(struct ishtp_device *dev)
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{
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struct ishtp_msg_hdr hdr;
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struct hbm_host_enum_request enum_req = { 0 };
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/* enumerate clients */
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ishtp_hbm_hdr(&hdr, sizeof(enum_req));
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enum_req.hbm_cmd = HOST_ENUM_REQ_CMD;
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if (ishtp_write_message(dev, &hdr, &enum_req)) {
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dev->dev_state = ISHTP_DEV_RESETTING;
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dev_err(dev->devc, "enumeration request send failed\n");
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ish_hw_reset(dev);
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}
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dev->hbm_state = ISHTP_HBM_ENUM_CLIENTS;
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}
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/**
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* ishtp_hbm_prop_req() - Request property
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* @dev: ISHTP device instance
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*
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* Request property for a single client
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*
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* Return: 0 if success else error code
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*/
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static int ishtp_hbm_prop_req(struct ishtp_device *dev)
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{
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struct ishtp_msg_hdr hdr;
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struct hbm_props_request prop_req = { 0 };
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unsigned long next_client_index;
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uint8_t client_num;
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client_num = dev->fw_client_presentation_num;
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next_client_index = find_next_bit(dev->fw_clients_map,
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ISHTP_CLIENTS_MAX, dev->fw_client_index);
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/* We got all client properties */
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if (next_client_index == ISHTP_CLIENTS_MAX) {
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dev->hbm_state = ISHTP_HBM_WORKING;
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dev->dev_state = ISHTP_DEV_ENABLED;
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for (dev->fw_client_presentation_num = 1;
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dev->fw_client_presentation_num < client_num + 1;
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++dev->fw_client_presentation_num)
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/* Add new client device */
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ishtp_bus_new_client(dev);
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return 0;
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}
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dev->fw_clients[client_num].client_id = next_client_index;
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ishtp_hbm_hdr(&hdr, sizeof(prop_req));
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prop_req.hbm_cmd = HOST_CLIENT_PROPERTIES_REQ_CMD;
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prop_req.address = next_client_index;
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if (ishtp_write_message(dev, &hdr, &prop_req)) {
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dev->dev_state = ISHTP_DEV_RESETTING;
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dev_err(dev->devc, "properties request send failed\n");
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ish_hw_reset(dev);
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return -EIO;
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}
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dev->fw_client_index = next_client_index;
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return 0;
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}
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/**
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* ishtp_hbm_stop_req() - Send HBM stop
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* @dev: ISHTP device instance
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*
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* Send stop request message
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*/
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static void ishtp_hbm_stop_req(struct ishtp_device *dev)
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{
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struct ishtp_msg_hdr hdr;
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struct hbm_host_stop_request stop_req = { 0 } ;
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ishtp_hbm_hdr(&hdr, sizeof(stop_req));
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stop_req.hbm_cmd = HOST_STOP_REQ_CMD;
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stop_req.reason = DRIVER_STOP_REQUEST;
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ishtp_write_message(dev, &hdr, &stop_req);
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}
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/**
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* ishtp_hbm_cl_flow_control_req() - Send flow control request
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* @dev: ISHTP device instance
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* @cl: ISHTP client instance
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*
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* Send flow control request
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*
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* Return: 0 if success else error code
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*/
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int ishtp_hbm_cl_flow_control_req(struct ishtp_device *dev,
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struct ishtp_cl *cl)
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{
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struct ishtp_msg_hdr hdr;
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struct hbm_flow_control flow_ctrl;
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const size_t len = sizeof(flow_ctrl);
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int rv;
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unsigned long flags;
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spin_lock_irqsave(&cl->fc_spinlock, flags);
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ishtp_hbm_hdr(&hdr, len);
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ishtp_hbm_cl_hdr(cl, ISHTP_FLOW_CONTROL_CMD, &flow_ctrl, len);
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/*
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* Sync possible race when RB recycle and packet receive paths
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* both try to send an out FC
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*/
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if (cl->out_flow_ctrl_creds) {
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spin_unlock_irqrestore(&cl->fc_spinlock, flags);
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return 0;
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}
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cl->recv_msg_num_frags = 0;
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rv = ishtp_write_message(dev, &hdr, &flow_ctrl);
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if (!rv) {
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++cl->out_flow_ctrl_creds;
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++cl->out_flow_ctrl_cnt;
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cl->ts_out_fc = ktime_get();
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if (cl->ts_rx) {
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ktime_t ts_diff = ktime_sub(cl->ts_out_fc, cl->ts_rx);
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if (ktime_after(ts_diff, cl->ts_max_fc_delay))
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cl->ts_max_fc_delay = ts_diff;
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}
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} else {
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++cl->err_send_fc;
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}
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spin_unlock_irqrestore(&cl->fc_spinlock, flags);
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return rv;
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}
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/**
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* ishtp_hbm_cl_disconnect_req() - Send disconnect request
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* @dev: ISHTP device instance
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* @cl: ISHTP client instance
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*
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* Send disconnect message to fw
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*
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* Return: 0 if success else error code
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*/
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int ishtp_hbm_cl_disconnect_req(struct ishtp_device *dev, struct ishtp_cl *cl)
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{
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struct ishtp_msg_hdr hdr;
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struct hbm_client_connect_request disconn_req;
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const size_t len = sizeof(disconn_req);
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ishtp_hbm_hdr(&hdr, len);
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ishtp_hbm_cl_hdr(cl, CLIENT_DISCONNECT_REQ_CMD, &disconn_req, len);
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return ishtp_write_message(dev, &hdr, &disconn_req);
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}
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/**
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* ishtp_hbm_cl_disconnect_res() - Get disconnect response
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* @dev: ISHTP device instance
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* @rs: Response message
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*
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* Received disconnect response from fw
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*/
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static void ishtp_hbm_cl_disconnect_res(struct ishtp_device *dev,
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struct hbm_client_connect_response *rs)
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{
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struct ishtp_cl *cl = NULL;
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unsigned long flags;
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spin_lock_irqsave(&dev->cl_list_lock, flags);
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list_for_each_entry(cl, &dev->cl_list, link) {
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if (!rs->status && ishtp_hbm_cl_addr_equal(cl, rs)) {
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cl->state = ISHTP_CL_DISCONNECTED;
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wake_up_interruptible(&cl->wait_ctrl_res);
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break;
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}
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}
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spin_unlock_irqrestore(&dev->cl_list_lock, flags);
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}
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/**
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* ishtp_hbm_cl_connect_req() - Send connect request
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* @dev: ISHTP device instance
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* @cl: client device instance
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*
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* Send connection request to specific fw client
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*
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* Return: 0 if success else error code
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*/
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int ishtp_hbm_cl_connect_req(struct ishtp_device *dev, struct ishtp_cl *cl)
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{
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struct ishtp_msg_hdr hdr;
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struct hbm_client_connect_request conn_req;
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const size_t len = sizeof(conn_req);
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ishtp_hbm_hdr(&hdr, len);
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ishtp_hbm_cl_hdr(cl, CLIENT_CONNECT_REQ_CMD, &conn_req, len);
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return ishtp_write_message(dev, &hdr, &conn_req);
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}
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/**
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* ishtp_hbm_cl_connect_res() - Get connect response
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* @dev: ISHTP device instance
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* @rs: Response message
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*
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* Received connect response from fw
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*/
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static void ishtp_hbm_cl_connect_res(struct ishtp_device *dev,
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struct hbm_client_connect_response *rs)
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{
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struct ishtp_cl *cl = NULL;
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unsigned long flags;
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spin_lock_irqsave(&dev->cl_list_lock, flags);
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list_for_each_entry(cl, &dev->cl_list, link) {
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if (ishtp_hbm_cl_addr_equal(cl, rs)) {
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if (!rs->status) {
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cl->state = ISHTP_CL_CONNECTED;
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cl->status = 0;
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} else {
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cl->state = ISHTP_CL_DISCONNECTED;
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cl->status = -ENODEV;
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}
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wake_up_interruptible(&cl->wait_ctrl_res);
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break;
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}
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}
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spin_unlock_irqrestore(&dev->cl_list_lock, flags);
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}
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/**
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* ishtp_client_disconnect_request() - Receive disconnect request
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* @dev: ISHTP device instance
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* @disconnect_req: disconnect request structure
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*
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* Disconnect request bus message from the fw. Send disconnect response.
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*/
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static void ishtp_hbm_fw_disconnect_req(struct ishtp_device *dev,
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struct hbm_client_connect_request *disconnect_req)
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{
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struct ishtp_cl *cl;
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const size_t len = sizeof(struct hbm_client_connect_response);
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unsigned long flags;
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struct ishtp_msg_hdr hdr;
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unsigned char data[4]; /* All HBM messages are 4 bytes */
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spin_lock_irqsave(&dev->cl_list_lock, flags);
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list_for_each_entry(cl, &dev->cl_list, link) {
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if (ishtp_hbm_cl_addr_equal(cl, disconnect_req)) {
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cl->state = ISHTP_CL_DISCONNECTED;
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/* send disconnect response */
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ishtp_hbm_hdr(&hdr, len);
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ishtp_hbm_cl_hdr(cl, CLIENT_DISCONNECT_RES_CMD, data,
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len);
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ishtp_write_message(dev, &hdr, data);
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break;
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}
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}
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spin_unlock_irqrestore(&dev->cl_list_lock, flags);
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}
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/**
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* ishtp_hbm_dma_xfer_ack(() - Receive transfer ACK
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* @dev: ISHTP device instance
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* @dma_xfer: HBM transfer message
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*
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* Receive ack for ISHTP-over-DMA client message
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*/
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static void ishtp_hbm_dma_xfer_ack(struct ishtp_device *dev,
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struct dma_xfer_hbm *dma_xfer)
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{
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void *msg;
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uint64_t offs;
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struct ishtp_msg_hdr *ishtp_hdr =
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(struct ishtp_msg_hdr *)&dev->ishtp_msg_hdr;
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unsigned int msg_offs;
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struct ishtp_cl *cl;
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for (msg_offs = 0; msg_offs < ishtp_hdr->length;
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msg_offs += sizeof(struct dma_xfer_hbm)) {
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offs = dma_xfer->msg_addr - dev->ishtp_host_dma_tx_buf_phys;
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if (offs > dev->ishtp_host_dma_tx_buf_size) {
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dev_err(dev->devc, "Bad DMA Tx ack message address\n");
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return;
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}
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if (dma_xfer->msg_length >
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dev->ishtp_host_dma_tx_buf_size - offs) {
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dev_err(dev->devc, "Bad DMA Tx ack message size\n");
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return;
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}
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/* logical address of the acked mem */
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msg = (unsigned char *)dev->ishtp_host_dma_tx_buf + offs;
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ishtp_cl_release_dma_acked_mem(dev, msg, dma_xfer->msg_length);
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list_for_each_entry(cl, &dev->cl_list, link) {
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if (cl->fw_client_id == dma_xfer->fw_client_id &&
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cl->host_client_id == dma_xfer->host_client_id)
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/*
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* in case that a single ack may be sent
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* over several dma transfers, and the last msg
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* addr was inside the acked memory, but not in
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* its start
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*/
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if (cl->last_dma_addr >=
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(unsigned char *)msg &&
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cl->last_dma_addr <
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(unsigned char *)msg +
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dma_xfer->msg_length) {
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cl->last_dma_acked = 1;
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if (!list_empty(&cl->tx_list.list) &&
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cl->ishtp_flow_ctrl_creds) {
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/*
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* start sending the first msg
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*/
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ishtp_cl_send_msg(dev, cl);
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}
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}
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}
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++dma_xfer;
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}
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}
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/**
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* ishtp_hbm_dma_xfer() - Receive DMA transfer message
|
|
* @dev: ISHTP device instance
|
|
* @dma_xfer: HBM transfer message
|
|
*
|
|
* Receive ISHTP-over-DMA client message
|
|
*/
|
|
static void ishtp_hbm_dma_xfer(struct ishtp_device *dev,
|
|
struct dma_xfer_hbm *dma_xfer)
|
|
{
|
|
void *msg;
|
|
uint64_t offs;
|
|
struct ishtp_msg_hdr hdr;
|
|
struct ishtp_msg_hdr *ishtp_hdr =
|
|
(struct ishtp_msg_hdr *) &dev->ishtp_msg_hdr;
|
|
struct dma_xfer_hbm *prm = dma_xfer;
|
|
unsigned int msg_offs;
|
|
|
|
for (msg_offs = 0; msg_offs < ishtp_hdr->length;
|
|
msg_offs += sizeof(struct dma_xfer_hbm)) {
|
|
|
|
offs = dma_xfer->msg_addr - dev->ishtp_host_dma_rx_buf_phys;
|
|
if (offs > dev->ishtp_host_dma_rx_buf_size) {
|
|
dev_err(dev->devc, "Bad DMA Rx message address\n");
|
|
return;
|
|
}
|
|
if (dma_xfer->msg_length >
|
|
dev->ishtp_host_dma_rx_buf_size - offs) {
|
|
dev_err(dev->devc, "Bad DMA Rx message size\n");
|
|
return;
|
|
}
|
|
msg = dev->ishtp_host_dma_rx_buf + offs;
|
|
recv_ishtp_cl_msg_dma(dev, msg, dma_xfer);
|
|
dma_xfer->hbm = DMA_XFER_ACK; /* Prepare for response */
|
|
++dma_xfer;
|
|
}
|
|
|
|
/* Send DMA_XFER_ACK [...] */
|
|
ishtp_hbm_hdr(&hdr, ishtp_hdr->length);
|
|
ishtp_write_message(dev, &hdr, (unsigned char *)prm);
|
|
}
|
|
|
|
/**
|
|
* ishtp_hbm_dispatch() - HBM dispatch function
|
|
* @dev: ISHTP device instance
|
|
* @hdr: bus message
|
|
*
|
|
* Bottom half read routine after ISR to handle the read bus message cmd
|
|
* processing
|
|
*/
|
|
void ishtp_hbm_dispatch(struct ishtp_device *dev,
|
|
struct ishtp_bus_message *hdr)
|
|
{
|
|
struct ishtp_bus_message *ishtp_msg;
|
|
struct ishtp_fw_client *fw_client;
|
|
struct hbm_host_version_response *version_res;
|
|
struct hbm_client_connect_response *connect_res;
|
|
struct hbm_client_connect_response *disconnect_res;
|
|
struct hbm_client_connect_request *disconnect_req;
|
|
struct hbm_props_response *props_res;
|
|
struct hbm_host_enum_response *enum_res;
|
|
struct ishtp_msg_hdr ishtp_hdr;
|
|
struct dma_alloc_notify dma_alloc_notify;
|
|
struct dma_xfer_hbm *dma_xfer;
|
|
|
|
ishtp_msg = hdr;
|
|
|
|
switch (ishtp_msg->hbm_cmd) {
|
|
case HOST_START_RES_CMD:
|
|
version_res = (struct hbm_host_version_response *)ishtp_msg;
|
|
if (!version_res->host_version_supported) {
|
|
dev->version = version_res->fw_max_version;
|
|
|
|
dev->hbm_state = ISHTP_HBM_STOPPED;
|
|
ishtp_hbm_stop_req(dev);
|
|
return;
|
|
}
|
|
|
|
dev->version.major_version = HBM_MAJOR_VERSION;
|
|
dev->version.minor_version = HBM_MINOR_VERSION;
|
|
if (dev->dev_state == ISHTP_DEV_INIT_CLIENTS &&
|
|
dev->hbm_state == ISHTP_HBM_START) {
|
|
dev->hbm_state = ISHTP_HBM_STARTED;
|
|
ishtp_hbm_enum_clients_req(dev);
|
|
} else {
|
|
dev_err(dev->devc,
|
|
"reset: wrong host start response\n");
|
|
/* BUG: why do we arrive here? */
|
|
ish_hw_reset(dev);
|
|
return;
|
|
}
|
|
|
|
wake_up_interruptible(&dev->wait_hbm_recvd_msg);
|
|
break;
|
|
|
|
case CLIENT_CONNECT_RES_CMD:
|
|
connect_res = (struct hbm_client_connect_response *)ishtp_msg;
|
|
ishtp_hbm_cl_connect_res(dev, connect_res);
|
|
break;
|
|
|
|
case CLIENT_DISCONNECT_RES_CMD:
|
|
disconnect_res =
|
|
(struct hbm_client_connect_response *)ishtp_msg;
|
|
ishtp_hbm_cl_disconnect_res(dev, disconnect_res);
|
|
break;
|
|
|
|
case HOST_CLIENT_PROPERTIES_RES_CMD:
|
|
props_res = (struct hbm_props_response *)ishtp_msg;
|
|
fw_client = &dev->fw_clients[dev->fw_client_presentation_num];
|
|
|
|
if (props_res->status || !dev->fw_clients) {
|
|
dev_err(dev->devc,
|
|
"reset: properties response hbm wrong status\n");
|
|
ish_hw_reset(dev);
|
|
return;
|
|
}
|
|
|
|
if (fw_client->client_id != props_res->address) {
|
|
dev_err(dev->devc,
|
|
"reset: host properties response address mismatch [%02X %02X]\n",
|
|
fw_client->client_id, props_res->address);
|
|
ish_hw_reset(dev);
|
|
return;
|
|
}
|
|
|
|
if (dev->dev_state != ISHTP_DEV_INIT_CLIENTS ||
|
|
dev->hbm_state != ISHTP_HBM_CLIENT_PROPERTIES) {
|
|
dev_err(dev->devc,
|
|
"reset: unexpected properties response\n");
|
|
ish_hw_reset(dev);
|
|
return;
|
|
}
|
|
|
|
fw_client->props = props_res->client_properties;
|
|
dev->fw_client_index++;
|
|
dev->fw_client_presentation_num++;
|
|
|
|
/* request property for the next client */
|
|
ishtp_hbm_prop_req(dev);
|
|
|
|
if (dev->dev_state != ISHTP_DEV_ENABLED)
|
|
break;
|
|
|
|
if (!ishtp_use_dma_transfer())
|
|
break;
|
|
|
|
dev_dbg(dev->devc, "Requesting to use DMA\n");
|
|
ishtp_cl_alloc_dma_buf(dev);
|
|
if (dev->ishtp_host_dma_rx_buf) {
|
|
const size_t len = sizeof(dma_alloc_notify);
|
|
|
|
memset(&dma_alloc_notify, 0, sizeof(dma_alloc_notify));
|
|
dma_alloc_notify.hbm = DMA_BUFFER_ALLOC_NOTIFY;
|
|
dma_alloc_notify.buf_size =
|
|
dev->ishtp_host_dma_rx_buf_size;
|
|
dma_alloc_notify.buf_address =
|
|
dev->ishtp_host_dma_rx_buf_phys;
|
|
ishtp_hbm_hdr(&ishtp_hdr, len);
|
|
ishtp_write_message(dev, &ishtp_hdr,
|
|
(unsigned char *)&dma_alloc_notify);
|
|
}
|
|
|
|
break;
|
|
|
|
case HOST_ENUM_RES_CMD:
|
|
enum_res = (struct hbm_host_enum_response *) ishtp_msg;
|
|
memcpy(dev->fw_clients_map, enum_res->valid_addresses, 32);
|
|
if (dev->dev_state == ISHTP_DEV_INIT_CLIENTS &&
|
|
dev->hbm_state == ISHTP_HBM_ENUM_CLIENTS) {
|
|
dev->fw_client_presentation_num = 0;
|
|
dev->fw_client_index = 0;
|
|
|
|
ishtp_hbm_fw_cl_allocate(dev);
|
|
dev->hbm_state = ISHTP_HBM_CLIENT_PROPERTIES;
|
|
|
|
/* first property request */
|
|
ishtp_hbm_prop_req(dev);
|
|
} else {
|
|
dev_err(dev->devc,
|
|
"reset: unexpected enumeration response hbm\n");
|
|
ish_hw_reset(dev);
|
|
return;
|
|
}
|
|
break;
|
|
|
|
case HOST_STOP_RES_CMD:
|
|
if (dev->hbm_state != ISHTP_HBM_STOPPED)
|
|
dev_err(dev->devc, "unexpected stop response\n");
|
|
|
|
dev->dev_state = ISHTP_DEV_DISABLED;
|
|
dev_info(dev->devc, "reset: FW stop response\n");
|
|
ish_hw_reset(dev);
|
|
break;
|
|
|
|
case CLIENT_DISCONNECT_REQ_CMD:
|
|
/* search for client */
|
|
disconnect_req =
|
|
(struct hbm_client_connect_request *)ishtp_msg;
|
|
ishtp_hbm_fw_disconnect_req(dev, disconnect_req);
|
|
break;
|
|
|
|
case FW_STOP_REQ_CMD:
|
|
dev->hbm_state = ISHTP_HBM_STOPPED;
|
|
break;
|
|
|
|
case DMA_BUFFER_ALLOC_RESPONSE:
|
|
dev->ishtp_host_dma_enabled = 1;
|
|
break;
|
|
|
|
case DMA_XFER:
|
|
dma_xfer = (struct dma_xfer_hbm *)ishtp_msg;
|
|
if (!dev->ishtp_host_dma_enabled) {
|
|
dev_err(dev->devc,
|
|
"DMA XFER requested but DMA is not enabled\n");
|
|
break;
|
|
}
|
|
ishtp_hbm_dma_xfer(dev, dma_xfer);
|
|
break;
|
|
|
|
case DMA_XFER_ACK:
|
|
dma_xfer = (struct dma_xfer_hbm *)ishtp_msg;
|
|
if (!dev->ishtp_host_dma_enabled ||
|
|
!dev->ishtp_host_dma_tx_buf) {
|
|
dev_err(dev->devc,
|
|
"DMA XFER acked but DMA Tx is not enabled\n");
|
|
break;
|
|
}
|
|
ishtp_hbm_dma_xfer_ack(dev, dma_xfer);
|
|
break;
|
|
|
|
default:
|
|
dev_err(dev->devc, "unknown HBM: %u\n",
|
|
(unsigned int)ishtp_msg->hbm_cmd);
|
|
|
|
break;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* bh_hbm_work_fn() - HBM work function
|
|
* @work: work struct
|
|
*
|
|
* Bottom half processing work function (instead of thread handler)
|
|
* for processing hbm messages
|
|
*/
|
|
void bh_hbm_work_fn(struct work_struct *work)
|
|
{
|
|
unsigned long flags;
|
|
struct ishtp_device *dev;
|
|
unsigned char hbm[IPC_PAYLOAD_SIZE];
|
|
|
|
dev = container_of(work, struct ishtp_device, bh_hbm_work);
|
|
spin_lock_irqsave(&dev->rd_msg_spinlock, flags);
|
|
if (dev->rd_msg_fifo_head != dev->rd_msg_fifo_tail) {
|
|
memcpy(hbm, dev->rd_msg_fifo + dev->rd_msg_fifo_head,
|
|
IPC_PAYLOAD_SIZE);
|
|
dev->rd_msg_fifo_head =
|
|
(dev->rd_msg_fifo_head + IPC_PAYLOAD_SIZE) %
|
|
(RD_INT_FIFO_SIZE * IPC_PAYLOAD_SIZE);
|
|
spin_unlock_irqrestore(&dev->rd_msg_spinlock, flags);
|
|
ishtp_hbm_dispatch(dev, (struct ishtp_bus_message *)hbm);
|
|
} else {
|
|
spin_unlock_irqrestore(&dev->rd_msg_spinlock, flags);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* recv_hbm() - Receive HBM message
|
|
* @dev: ISHTP device instance
|
|
* @ishtp_hdr: received bus message
|
|
*
|
|
* Receive and process ISHTP bus messages in ISR context. This will schedule
|
|
* work function to process message
|
|
*/
|
|
void recv_hbm(struct ishtp_device *dev, struct ishtp_msg_hdr *ishtp_hdr)
|
|
{
|
|
uint8_t rd_msg_buf[ISHTP_RD_MSG_BUF_SIZE];
|
|
struct ishtp_bus_message *ishtp_msg =
|
|
(struct ishtp_bus_message *)rd_msg_buf;
|
|
unsigned long flags;
|
|
|
|
dev->ops->ishtp_read(dev, rd_msg_buf, ishtp_hdr->length);
|
|
|
|
/* Flow control - handle in place */
|
|
if (ishtp_msg->hbm_cmd == ISHTP_FLOW_CONTROL_CMD) {
|
|
struct hbm_flow_control *flow_control =
|
|
(struct hbm_flow_control *)ishtp_msg;
|
|
struct ishtp_cl *cl = NULL;
|
|
unsigned long flags, tx_flags;
|
|
|
|
spin_lock_irqsave(&dev->cl_list_lock, flags);
|
|
list_for_each_entry(cl, &dev->cl_list, link) {
|
|
if (cl->host_client_id == flow_control->host_addr &&
|
|
cl->fw_client_id ==
|
|
flow_control->fw_addr) {
|
|
/*
|
|
* NOTE: It's valid only for counting
|
|
* flow-control implementation to receive a
|
|
* FC in the middle of sending. Meanwhile not
|
|
* supported
|
|
*/
|
|
if (cl->ishtp_flow_ctrl_creds)
|
|
dev_err(dev->devc,
|
|
"recv extra FC from FW client %u (host client %u) (FC count was %d)\n",
|
|
(unsigned int)cl->fw_client_id,
|
|
(unsigned int)cl->host_client_id,
|
|
cl->ishtp_flow_ctrl_creds);
|
|
else {
|
|
++cl->ishtp_flow_ctrl_creds;
|
|
++cl->ishtp_flow_ctrl_cnt;
|
|
cl->last_ipc_acked = 1;
|
|
spin_lock_irqsave(
|
|
&cl->tx_list_spinlock,
|
|
tx_flags);
|
|
if (!list_empty(&cl->tx_list.list)) {
|
|
/*
|
|
* start sending the first msg
|
|
* = the callback function
|
|
*/
|
|
spin_unlock_irqrestore(
|
|
&cl->tx_list_spinlock,
|
|
tx_flags);
|
|
ishtp_cl_send_msg(dev, cl);
|
|
} else {
|
|
spin_unlock_irqrestore(
|
|
&cl->tx_list_spinlock,
|
|
tx_flags);
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&dev->cl_list_lock, flags);
|
|
goto eoi;
|
|
}
|
|
|
|
/*
|
|
* Some messages that are safe for ISR processing and important
|
|
* to be done "quickly" and in-order, go here
|
|
*/
|
|
if (ishtp_msg->hbm_cmd == CLIENT_CONNECT_RES_CMD ||
|
|
ishtp_msg->hbm_cmd == CLIENT_DISCONNECT_RES_CMD ||
|
|
ishtp_msg->hbm_cmd == CLIENT_DISCONNECT_REQ_CMD ||
|
|
ishtp_msg->hbm_cmd == DMA_XFER) {
|
|
ishtp_hbm_dispatch(dev, ishtp_msg);
|
|
goto eoi;
|
|
}
|
|
|
|
/*
|
|
* All other HBMs go here.
|
|
* We schedule HBMs for processing serially by using system wq,
|
|
* possibly there will be multiple HBMs scheduled at the same time.
|
|
*/
|
|
spin_lock_irqsave(&dev->rd_msg_spinlock, flags);
|
|
if ((dev->rd_msg_fifo_tail + IPC_PAYLOAD_SIZE) %
|
|
(RD_INT_FIFO_SIZE * IPC_PAYLOAD_SIZE) ==
|
|
dev->rd_msg_fifo_head) {
|
|
spin_unlock_irqrestore(&dev->rd_msg_spinlock, flags);
|
|
dev_err(dev->devc, "BH buffer overflow, dropping HBM %u\n",
|
|
(unsigned int)ishtp_msg->hbm_cmd);
|
|
goto eoi;
|
|
}
|
|
memcpy(dev->rd_msg_fifo + dev->rd_msg_fifo_tail, ishtp_msg,
|
|
ishtp_hdr->length);
|
|
dev->rd_msg_fifo_tail = (dev->rd_msg_fifo_tail + IPC_PAYLOAD_SIZE) %
|
|
(RD_INT_FIFO_SIZE * IPC_PAYLOAD_SIZE);
|
|
spin_unlock_irqrestore(&dev->rd_msg_spinlock, flags);
|
|
schedule_work(&dev->bh_hbm_work);
|
|
eoi:
|
|
return;
|
|
}
|
|
|
|
/**
|
|
* recv_fixed_cl_msg() - Receive fixed client message
|
|
* @dev: ISHTP device instance
|
|
* @ishtp_hdr: received bus message
|
|
*
|
|
* Receive and process ISHTP fixed client messages (address == 0)
|
|
* in ISR context
|
|
*/
|
|
void recv_fixed_cl_msg(struct ishtp_device *dev,
|
|
struct ishtp_msg_hdr *ishtp_hdr)
|
|
{
|
|
uint8_t rd_msg_buf[ISHTP_RD_MSG_BUF_SIZE];
|
|
|
|
dev->print_log(dev,
|
|
"%s() got fixed client msg from client #%d\n",
|
|
__func__, ishtp_hdr->fw_addr);
|
|
dev->ops->ishtp_read(dev, rd_msg_buf, ishtp_hdr->length);
|
|
if (ishtp_hdr->fw_addr == ISHTP_SYSTEM_STATE_CLIENT_ADDR) {
|
|
struct ish_system_states_header *msg_hdr =
|
|
(struct ish_system_states_header *)rd_msg_buf;
|
|
if (msg_hdr->cmd == SYSTEM_STATE_SUBSCRIBE)
|
|
ishtp_send_resume(dev);
|
|
/* if FW request arrived here, the system is not suspended */
|
|
else
|
|
dev_err(dev->devc, "unknown fixed client msg [%02X]\n",
|
|
msg_hdr->cmd);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* fix_cl_hdr() - Initialize fixed client header
|
|
* @hdr: message header
|
|
* @length: length of message
|
|
* @cl_addr: Client address
|
|
*
|
|
* Initialize message header for fixed client
|
|
*/
|
|
static inline void fix_cl_hdr(struct ishtp_msg_hdr *hdr, size_t length,
|
|
uint8_t cl_addr)
|
|
{
|
|
hdr->host_addr = 0;
|
|
hdr->fw_addr = cl_addr;
|
|
hdr->length = length;
|
|
hdr->msg_complete = 1;
|
|
hdr->reserved = 0;
|
|
}
|
|
|
|
/*** Suspend and resume notification ***/
|
|
|
|
static uint32_t current_state;
|
|
static uint32_t supported_states = 0 | SUSPEND_STATE_BIT;
|
|
|
|
/**
|
|
* ishtp_send_suspend() - Send suspend message to FW
|
|
* @dev: ISHTP device instance
|
|
*
|
|
* Send suspend message to FW. This is useful for system freeze (non S3) case
|
|
*/
|
|
void ishtp_send_suspend(struct ishtp_device *dev)
|
|
{
|
|
struct ishtp_msg_hdr ishtp_hdr;
|
|
struct ish_system_states_status state_status_msg;
|
|
const size_t len = sizeof(struct ish_system_states_status);
|
|
|
|
fix_cl_hdr(&ishtp_hdr, len, ISHTP_SYSTEM_STATE_CLIENT_ADDR);
|
|
|
|
memset(&state_status_msg, 0, len);
|
|
state_status_msg.hdr.cmd = SYSTEM_STATE_STATUS;
|
|
state_status_msg.supported_states = supported_states;
|
|
current_state |= SUSPEND_STATE_BIT;
|
|
dev->print_log(dev, "%s() sends SUSPEND notification\n", __func__);
|
|
state_status_msg.states_status = current_state;
|
|
|
|
ishtp_write_message(dev, &ishtp_hdr,
|
|
(unsigned char *)&state_status_msg);
|
|
}
|
|
EXPORT_SYMBOL(ishtp_send_suspend);
|
|
|
|
/**
|
|
* ishtp_send_resume() - Send resume message to FW
|
|
* @dev: ISHTP device instance
|
|
*
|
|
* Send resume message to FW. This is useful for system freeze (non S3) case
|
|
*/
|
|
void ishtp_send_resume(struct ishtp_device *dev)
|
|
{
|
|
struct ishtp_msg_hdr ishtp_hdr;
|
|
struct ish_system_states_status state_status_msg;
|
|
const size_t len = sizeof(struct ish_system_states_status);
|
|
|
|
fix_cl_hdr(&ishtp_hdr, len, ISHTP_SYSTEM_STATE_CLIENT_ADDR);
|
|
|
|
memset(&state_status_msg, 0, len);
|
|
state_status_msg.hdr.cmd = SYSTEM_STATE_STATUS;
|
|
state_status_msg.supported_states = supported_states;
|
|
current_state &= ~SUSPEND_STATE_BIT;
|
|
dev->print_log(dev, "%s() sends RESUME notification\n", __func__);
|
|
state_status_msg.states_status = current_state;
|
|
|
|
ishtp_write_message(dev, &ishtp_hdr,
|
|
(unsigned char *)&state_status_msg);
|
|
}
|
|
EXPORT_SYMBOL(ishtp_send_resume);
|
|
|
|
/**
|
|
* ishtp_query_subscribers() - Send query subscribers message
|
|
* @dev: ISHTP device instance
|
|
*
|
|
* Send message to query subscribers
|
|
*/
|
|
void ishtp_query_subscribers(struct ishtp_device *dev)
|
|
{
|
|
struct ishtp_msg_hdr ishtp_hdr;
|
|
struct ish_system_states_query_subscribers query_subscribers_msg;
|
|
const size_t len = sizeof(struct ish_system_states_query_subscribers);
|
|
|
|
fix_cl_hdr(&ishtp_hdr, len, ISHTP_SYSTEM_STATE_CLIENT_ADDR);
|
|
|
|
memset(&query_subscribers_msg, 0, len);
|
|
query_subscribers_msg.hdr.cmd = SYSTEM_STATE_QUERY_SUBSCRIBERS;
|
|
|
|
ishtp_write_message(dev, &ishtp_hdr,
|
|
(unsigned char *)&query_subscribers_msg);
|
|
}
|