diff options
Diffstat (limited to 'drivers/staging/heci/heci_interface.c')
| -rw-r--r-- | drivers/staging/heci/heci_interface.c | 485 |
1 files changed, 485 insertions, 0 deletions
diff --git a/drivers/staging/heci/heci_interface.c b/drivers/staging/heci/heci_interface.c new file mode 100644 index 000000000000..c5f51a7ddf2c --- /dev/null +++ b/drivers/staging/heci/heci_interface.c @@ -0,0 +1,485 @@ +/* + * Part of Intel(R) Manageability Engine Interface Linux driver + * + * Copyright (c) 2003 - 2008 Intel Corp. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions, and the following disclaimer, + * without modification. + * 2. Redistributions in binary form must reproduce at minimum a disclaimer + * substantially similar to the "NO WARRANTY" disclaimer below + * ("Disclaimer") and any redistribution must be conditioned upon + * including a substantially similar Disclaimer requirement for further + * binary redistribution. + * 3. Neither the names of the above-listed copyright holders nor the names + * of any contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * Alternatively, this software may be distributed under the terms of the + * GNU General Public License ("GPL") version 2 as published by the Free + * Software Foundation. + * + * NO WARRANTY + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING + * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGES. + * + */ + + +#include "heci.h" +#include "heci_interface.h" + + +/** + * heci_set_csr_register - write H_CSR register to the heci device + * + * @dev: device object for our driver + */ +void heci_set_csr_register(struct iamt_heci_device *dev) +{ + write_heci_register(dev, H_CSR, dev->host_hw_state); + dev->host_hw_state = read_heci_register(dev, H_CSR); +} + +/** + * heci_csr_enable_interrupts - enable heci device interrupts + * + * @dev: device object for our driver + */ +void heci_csr_enable_interrupts(struct iamt_heci_device *dev) +{ + dev->host_hw_state |= H_IE; + heci_set_csr_register(dev); +} + +/** + * heci_csr_disable_interrupts - disable heci device interrupts + * + * @dev: device object for our driver + */ +void heci_csr_disable_interrupts(struct iamt_heci_device *dev) +{ + dev->host_hw_state &= ~H_IE; + heci_set_csr_register(dev); +} + + +/** + * _host_get_filled_slots - get number of device filled buffer slots + * + * @device: the device structure + * + * returns numer of filled slots + */ +static unsigned char _host_get_filled_slots(const struct iamt_heci_device *dev) +{ + char read_ptr, write_ptr; + + read_ptr = (char) ((dev->host_hw_state & H_CBRP) >> 8); + write_ptr = (char) ((dev->host_hw_state & H_CBWP) >> 16); + + return (unsigned char) (write_ptr - read_ptr); +} + +/** + * host_buffer_is_empty - check if host buffer is empty. + * + * @dev: device object for our driver + * + * returns 1 if empty, 0 - otherwise. + */ +int host_buffer_is_empty(struct iamt_heci_device *dev) +{ + unsigned char filled_slots; + + dev->host_hw_state = read_heci_register(dev, H_CSR); + filled_slots = _host_get_filled_slots(dev); + + if (filled_slots > 0) + return 0; + + return 1; +} + +/** + * count_empty_write_slots - count write empty slots. + * + * @dev: device object for our driver + * + * returns -1(ESLOTS_OVERFLOW) if overflow, otherwise empty slots count + */ +__s32 count_empty_write_slots(const struct iamt_heci_device *dev) +{ + unsigned char buffer_depth, filled_slots, empty_slots; + + buffer_depth = (unsigned char) ((dev->host_hw_state & H_CBD) >> 24); + filled_slots = _host_get_filled_slots(dev); + empty_slots = buffer_depth - filled_slots; + + if (filled_slots > buffer_depth) { + /* overflow */ + return -ESLOTS_OVERFLOW; + } + + return (__s32) empty_slots; +} + +/** + * heci_write_message - write a message to heci device. + * + * @dev: device object for our driver + * @heci_hdr: header of message + * @write_buffer: message buffer will be write + * @write_length: message size will be write + * + * returns 1 if success, 0 - otherwise. + */ +int heci_write_message(struct iamt_heci_device *dev, + struct heci_msg_hdr *header, + unsigned char *write_buffer, + unsigned long write_length) +{ + __u32 temp_msg = 0; + unsigned long bytes_written = 0; + unsigned char buffer_depth, filled_slots, empty_slots; + unsigned long dw_to_write; + + dev->host_hw_state = read_heci_register(dev, H_CSR); + DBG("host_hw_state = 0x%08x.\n", dev->host_hw_state); + DBG("heci_write_message header=%08x.\n", *((__u32 *) header)); + buffer_depth = (unsigned char) ((dev->host_hw_state & H_CBD) >> 24); + filled_slots = _host_get_filled_slots(dev); + empty_slots = buffer_depth - filled_slots; + DBG("filled = %hu, empty = %hu.\n", filled_slots, empty_slots); + + dw_to_write = ((write_length + 3) / 4); + + if (dw_to_write > empty_slots) + return 0; + + write_heci_register(dev, H_CB_WW, *((__u32 *) header)); + + while (write_length >= 4) { + write_heci_register(dev, H_CB_WW, + *(__u32 *) (write_buffer + bytes_written)); + bytes_written += 4; + write_length -= 4; + } + + if (write_length > 0) { + memcpy(&temp_msg, &write_buffer[bytes_written], write_length); + write_heci_register(dev, H_CB_WW, temp_msg); + } + + dev->host_hw_state |= H_IG; + write_heci_register(dev, H_CSR, dev->host_hw_state); + dev->me_hw_state = read_heci_register(dev, ME_CSR_HA); + if ((dev->me_hw_state & ME_RDY_HRA) != ME_RDY_HRA) + return 0; + + dev->write_hang = 0; + return 1; +} + +/** + * count_full_read_slots - count read full slots. + * + * @dev: device object for our driver + * + * returns -1(ESLOTS_OVERFLOW) if overflow, otherwise filled slots count + */ +__s32 count_full_read_slots(struct iamt_heci_device *dev) +{ + char read_ptr, write_ptr; + unsigned char buffer_depth, filled_slots; + + dev->me_hw_state = read_heci_register(dev, ME_CSR_HA); + buffer_depth = (unsigned char)((dev->me_hw_state & ME_CBD_HRA) >> 24); + read_ptr = (char) ((dev->me_hw_state & ME_CBRP_HRA) >> 8); + write_ptr = (char) ((dev->me_hw_state & ME_CBWP_HRA) >> 16); + filled_slots = (unsigned char) (write_ptr - read_ptr); + + if (filled_slots > buffer_depth) { + /* overflow */ + return -ESLOTS_OVERFLOW; + } + + DBG("filled_slots =%08x \n", filled_slots); + return (__s32) filled_slots; +} + +/** + * heci_read_slots - read a message from heci device. + * + * @dev: device object for our driver + * @buffer: message buffer will be write + * @buffer_length: message size will be read + */ +void heci_read_slots(struct iamt_heci_device *dev, + unsigned char *buffer, unsigned long buffer_length) +{ + __u32 i = 0; + unsigned char temp_buf[sizeof(__u32)]; + + while (buffer_length >= sizeof(__u32)) { + ((__u32 *) buffer)[i] = read_heci_register(dev, ME_CB_RW); + DBG("buffer[%d]= %d\n", i, ((__u32 *) buffer)[i]); + i++; + buffer_length -= sizeof(__u32); + } + + if (buffer_length > 0) { + *((__u32 *) &temp_buf) = read_heci_register(dev, ME_CB_RW); + memcpy(&buffer[i * 4], temp_buf, buffer_length); + } + + dev->host_hw_state |= H_IG; + heci_set_csr_register(dev); +} + +/** + * flow_ctrl_creds - check flow_control credentials. + * + * @dev: device object for our driver + * @file_ext: private data of the file object + * + * returns 1 if flow_ctrl_creds >0, 0 - otherwise. + */ +int flow_ctrl_creds(struct iamt_heci_device *dev, + struct heci_file_private *file_ext) +{ + __u8 i; + + if (!dev->num_heci_me_clients) + return 0; + + if (file_ext == NULL) + return 0; + + if (file_ext->flow_ctrl_creds > 0) + return 1; + + for (i = 0; i < dev->num_heci_me_clients; i++) { + if (dev->me_clients[i].client_id == file_ext->me_client_id) { + if (dev->me_clients[i].flow_ctrl_creds > 0) { + BUG_ON(dev->me_clients[i].props.single_recv_buf + == 0); + return 1; + } + return 0; + } + } + BUG(); + return 0; +} + +/** + * flow_ctrl_reduce - reduce flow_control. + * + * @dev: device object for our driver + * @file_ext: private data of the file object + */ +void flow_ctrl_reduce(struct iamt_heci_device *dev, + struct heci_file_private *file_ext) +{ + __u8 i; + + if (!dev->num_heci_me_clients) + return; + + for (i = 0; i < dev->num_heci_me_clients; i++) { + if (dev->me_clients[i].client_id == file_ext->me_client_id) { + if (dev->me_clients[i].props.single_recv_buf != 0) { + BUG_ON(dev->me_clients[i].flow_ctrl_creds <= 0); + dev->me_clients[i].flow_ctrl_creds--; + } else { + BUG_ON(file_ext->flow_ctrl_creds <= 0); + file_ext->flow_ctrl_creds--; + } + return; + } + } + BUG(); +} + +/** + * heci_send_flow_control - send flow control to fw. + * + * @dev: device object for our driver + * @file_ext: private data of the file object + * + * returns 1 if success, 0 - otherwise. + */ +int heci_send_flow_control(struct iamt_heci_device *dev, + struct heci_file_private *file_ext) +{ + struct heci_msg_hdr *heci_hdr; + struct hbm_flow_control *heci_flow_control; + + heci_hdr = (struct heci_msg_hdr *) &dev->wr_msg_buf[0]; + heci_hdr->host_addr = 0; + heci_hdr->me_addr = 0; + heci_hdr->length = sizeof(struct hbm_flow_control); + heci_hdr->msg_complete = 1; + heci_hdr->reserved = 0; + + heci_flow_control = (struct hbm_flow_control *) &dev->wr_msg_buf[1]; + memset(heci_flow_control, 0, sizeof(heci_flow_control)); + heci_flow_control->host_addr = file_ext->host_client_id; + heci_flow_control->me_addr = file_ext->me_client_id; + heci_flow_control->cmd.cmd = HECI_FLOW_CONTROL_CMD; + memset(heci_flow_control->reserved, 0, + sizeof(heci_flow_control->reserved)); + DBG("sending flow control host client = %d, me client = %d\n", + file_ext->host_client_id, file_ext->me_client_id); + if (!heci_write_message(dev, heci_hdr, + (unsigned char *) heci_flow_control, + sizeof(struct hbm_flow_control))) + return 0; + + return 1; + +} + +/** + * other_client_is_connecting - check if other + * client with the same client id is connected. + * + * @dev: device object for our driver + * @file_ext: private data of the file object + * + * returns 1 if other client is connected, 0 - otherwise. + */ +int other_client_is_connecting(struct iamt_heci_device *dev, + struct heci_file_private *file_ext) +{ + struct heci_file_private *file_pos = NULL; + struct heci_file_private *file_next = NULL; + + list_for_each_entry_safe(file_pos, file_next, &dev->file_list, link) { + if ((file_pos->state == HECI_FILE_CONNECTING) + && (file_pos != file_ext) + && file_ext->me_client_id == file_pos->me_client_id) + return 1; + + } + return 0; +} + +/** + * heci_send_wd - send watch dog message to fw. + * + * @dev: device object for our driver + * + * returns 1 if success, 0 - otherwise. + */ +int heci_send_wd(struct iamt_heci_device *dev) +{ + struct heci_msg_hdr *heci_hdr; + + heci_hdr = (struct heci_msg_hdr *) &dev->wr_msg_buf[0]; + heci_hdr->host_addr = dev->wd_file_ext.host_client_id; + heci_hdr->me_addr = dev->wd_file_ext.me_client_id; + heci_hdr->msg_complete = 1; + heci_hdr->reserved = 0; + + if (!memcmp(dev->wd_data, heci_start_wd_params, + HECI_WD_PARAMS_SIZE)) { + heci_hdr->length = HECI_START_WD_DATA_SIZE; + } else { + BUG_ON(memcmp(dev->wd_data, heci_stop_wd_params, + HECI_WD_PARAMS_SIZE)); + heci_hdr->length = HECI_WD_PARAMS_SIZE; + } + + if (!heci_write_message(dev, heci_hdr, dev->wd_data, heci_hdr->length)) + return 0; + + return 1; +} + +/** + * heci_disconnect - send disconnect message to fw. + * + * @dev: device object for our driver + * @file_ext: private data of the file object + * + * returns 1 if success, 0 - otherwise. + */ +int heci_disconnect(struct iamt_heci_device *dev, + struct heci_file_private *file_ext) +{ + struct heci_msg_hdr *heci_hdr; + struct hbm_client_disconnect_request *heci_cli_disconnect; + + heci_hdr = (struct heci_msg_hdr *) &dev->wr_msg_buf[0]; + heci_hdr->host_addr = 0; + heci_hdr->me_addr = 0; + heci_hdr->length = sizeof(struct hbm_client_disconnect_request); + heci_hdr->msg_complete = 1; + heci_hdr->reserved = 0; + + heci_cli_disconnect = + (struct hbm_client_disconnect_request *) &dev->wr_msg_buf[1]; + memset(heci_cli_disconnect, 0, sizeof(heci_cli_disconnect)); + heci_cli_disconnect->host_addr = file_ext->host_client_id; + heci_cli_disconnect->me_addr = file_ext->me_client_id; + heci_cli_disconnect->cmd.cmd = CLIENT_DISCONNECT_REQ_CMD; + heci_cli_disconnect->reserved[0] = 0; + + if (!heci_write_message(dev, heci_hdr, + (unsigned char *) heci_cli_disconnect, + sizeof(struct hbm_client_disconnect_request))) + return 0; + + return 1; +} + +/** + * heci_connect - send connect message to fw. + * + * @dev: device object for our driver + * @file_ext: private data of the file object + * + * returns 1 if success, 0 - otherwise. + */ +int heci_connect(struct iamt_heci_device *dev, + struct heci_file_private *file_ext) +{ + struct heci_msg_hdr *heci_hdr; + struct hbm_client_connect_request *heci_cli_connect; + + heci_hdr = (struct heci_msg_hdr *) &dev->wr_msg_buf[0]; + heci_hdr->host_addr = 0; + heci_hdr->me_addr = 0; + heci_hdr->length = sizeof(struct hbm_client_connect_request); + heci_hdr->msg_complete = 1; + heci_hdr->reserved = 0; + + heci_cli_connect = + (struct hbm_client_connect_request *) &dev->wr_msg_buf[1]; + heci_cli_connect->host_addr = file_ext->host_client_id; + heci_cli_connect->me_addr = file_ext->me_client_id; + heci_cli_connect->cmd.cmd = CLIENT_CONNECT_REQ_CMD; + heci_cli_connect->reserved = 0; + + if (!heci_write_message(dev, heci_hdr, + (unsigned char *) heci_cli_connect, + sizeof(struct hbm_client_connect_request))) + return 0; + + return 1; +} |