// SPDX-License-Identifier: GPL-2.0 /* * ISH-TP client driver for ISH firmware loading * * Copyright (c) 2019, Intel Corporation. */ #include #include #include #include #include #include /* Number of times we attempt to load the firmware before giving up */ #define MAX_LOAD_ATTEMPTS 3 /* ISH TX/RX ring buffer pool size */ #define LOADER_CL_RX_RING_SIZE 1 #define LOADER_CL_TX_RING_SIZE 1 /* * ISH Shim firmware loader reserves 4 Kb buffer in SRAM. The buffer is * used to temporarily hold the data transferred from host to Shim * firmware loader. Reason for the odd size of 3968 bytes? Each IPC * transfer is 128 bytes (= 4 bytes header + 124 bytes payload). So the * 4 Kb buffer can hold maximum of 32 IPC transfers, which means we can * have a max payload of 3968 bytes (= 32 x 124 payload). */ #define LOADER_SHIM_IPC_BUF_SIZE 3968 /** * enum ish_loader_commands - ISH loader host commands. * @LOADER_CMD_XFER_QUERY: Query the Shim firmware loader for * capabilities * @LOADER_CMD_XFER_FRAGMENT: Transfer one firmware image fragment at a * time. The command may be executed * multiple times until the entire firmware * image is downloaded to SRAM. * @LOADER_CMD_START: Start executing the main firmware. */ enum ish_loader_commands { LOADER_CMD_XFER_QUERY = 0, LOADER_CMD_XFER_FRAGMENT, LOADER_CMD_START, }; /* Command bit mask */ #define CMD_MASK GENMASK(6, 0) #define IS_RESPONSE BIT(7) /* * ISH firmware max delay for one transmit failure is 1 Hz, * and firmware will retry 2 times, so 3 Hz is used for timeout. */ #define ISHTP_SEND_TIMEOUT (3 * HZ) /* * Loader transfer modes: * * LOADER_XFER_MODE_ISHTP mode uses the existing ISH-TP mechanism to * transfer data. This may use IPC or DMA if supported in firmware. * The buffer size is limited to 4 Kb by the IPC/ISH-TP protocol for * both IPC & DMA (legacy). * * LOADER_XFER_MODE_DIRECT_DMA - firmware loading is a bit different * from the sensor data streaming. Here we download a large (300+ Kb) * image directly to ISH SRAM memory. There is limited benefit of * DMA'ing 300 Kb image in 4 Kb chucks limit. Hence, we introduce * this "direct dma" mode, where we do not use ISH-TP for DMA, but * instead manage the DMA directly in kernel driver and Shim firmware * loader (allocate buffer, break in chucks and transfer). This allows * to overcome 4 Kb limit, and optimize the data flow path in firmware. */ #define LOADER_XFER_MODE_DIRECT_DMA BIT(0) #define LOADER_XFER_MODE_ISHTP BIT(1) /* ISH Transport Loader client unique GUID */ static const struct ishtp_device_id loader_ishtp_id_table[] = { { .guid = GUID_INIT(0xc804d06a, 0x55bd, 0x4ea7, 0xad, 0xed, 0x1e, 0x31, 0x22, 0x8c, 0x76, 0xdc) }, { } }; MODULE_DEVICE_TABLE(ishtp, loader_ishtp_id_table); #define FILENAME_SIZE 256 /* * The firmware loading latency will be minimum if we can DMA the * entire ISH firmware image in one go. This requires that we allocate * a large DMA buffer in kernel, which could be problematic on some * platforms. So here we limit the DMA buffer size via a module_param. * We default to 4 pages, but a customer can set it to higher limit if * deemed appropriate for his platform. */ static int dma_buf_size_limit = 4 * PAGE_SIZE; /** * struct loader_msg_hdr - Header for ISH Loader commands. * @command: LOADER_CMD* commands. Bit 7 is the response. * @reserved: Reserved space * @status: Command response status. Non 0, is error * condition. * * This structure is used as header for every command/data sent/received * between Host driver and ISH Shim firmware loader. */ struct loader_msg_hdr { u8 command; u8 reserved[2]; u8 status; } __packed; struct loader_xfer_query { struct loader_msg_hdr hdr; u32 image_size; } __packed; struct ish_fw_version { u16 major; u16 minor; u16 hotfix; u16 build; } __packed; union loader_version { u32 value; struct { u8 major; u8 minor; u8 hotfix; u8 build; }; } __packed; struct loader_capability { u32 max_fw_image_size; u32 xfer_mode; u32 max_dma_buf_size; /* only for dma mode, multiples of cacheline */ } __packed; struct shim_fw_info { struct ish_fw_version ish_fw_version; u32 protocol_version; union loader_version ldr_version; struct loader_capability ldr_capability; } __packed; struct loader_xfer_query_response { struct loader_msg_hdr hdr; struct shim_fw_info fw_info; } __packed; struct loader_xfer_fragment { struct loader_msg_hdr hdr; u32 xfer_mode; u32 offset; u32 size; u32 is_last; } __packed; struct loader_xfer_ipc_fragment { struct loader_xfer_fragment fragment; u8 data[] ____cacheline_aligned; /* variable length payload here */ } __packed; struct loader_xfer_dma_fragment { struct loader_xfer_fragment fragment; u64 ddr_phys_addr; } __packed; struct loader_start { struct loader_msg_hdr hdr; } __packed; /** * struct response_info - Encapsulate firmware response related * information for passing between function * loader_cl_send() and process_recv() callback. * @data: Copy the data received from firmware here. * @max_size: Max size allocated for the @data buffer. If the * received data exceeds this value, we log an * error. * @size: Actual size of data received from firmware. * @error: Returns 0 for success, negative error code for a * failure in function process_recv(). * @received: Set to true on receiving a valid firmware * response to host command * @wait_queue: Wait queue for Host firmware loading where the * client sends message to ISH firmware and waits * for response */ struct response_info { void *data; size_t max_size; size_t size; int error; bool received; wait_queue_head_t wait_queue; }; /* * struct ishtp_cl_data - Encapsulate per ISH-TP Client Data. * @work_ishtp_reset: Work queue for reset handling. * @work_fw_load: Work queue for host firmware loading. * @flag_retry: Flag for indicating host firmware loading should * be retried. * @retry_count: Count the number of retries. * * This structure is used to store data per client. */ struct ishtp_cl_data { struct ishtp_cl *loader_ishtp_cl; struct ishtp_cl_device *cl_device; /* * Used for passing firmware response information between * loader_cl_send() and process_recv() callback. */ struct response_info response; struct work_struct work_ishtp_reset; struct work_struct work_fw_load; /* * In certain failure scenrios, it makes sense to reset the ISH * subsystem and retry Host firmware loading (e.g. bad message * packet, ENOMEM, etc.). On the other hand, failures due to * protocol mismatch, etc., are not recoverable. We do not * retry them. * * If set, the flag indicates that we should re-try the * particular failure. */ bool flag_retry; int retry_count; }; #define IPC_FRAGMENT_DATA_PREAMBLE \ offsetof(struct loader_xfer_ipc_fragment, data) #define cl_data_to_dev(client_data) ishtp_device((client_data)->cl_device) /** * get_firmware_variant() - Gets the filename of firmware image to be * loaded based on platform variant. * @client_data: Client data instance. * @filename: Returns firmware filename. * * Queries the firmware-name device property string. * * Return: 0 for success, negative error code for failure. */ static int get_firmware_variant(struct ishtp_cl_data *client_data, char *filename) { int rv; const char *val; struct device *devc = ishtp_get_pci_device(client_data->cl_device); rv = device_property_read_string(devc, "firmware-name", &val); if (rv < 0) { dev_err(devc, "Error: ISH firmware-name device property required\n"); return rv; } return snprintf(filename, FILENAME_SIZE, "intel/%s", val); } /** * loader_cl_send() - Send message from host to firmware * * @client_data: Client data instance * @out_msg: Message buffer to be sent to firmware * @out_size: Size of out going message * @in_msg: Message buffer where the incoming data copied. * This buffer is allocated by calling * @in_size: Max size of incoming message * * Return: Number of bytes copied in the in_msg on success, negative * error code on failure. */ static int loader_cl_send(struct ishtp_cl_data *client_data, u8 *out_msg, size_t out_size, u8 *in_msg, size_t in_size) { int rv; struct loader_msg_hdr *out_hdr = (struct loader_msg_hdr *)out_msg; struct ishtp_cl *loader_ishtp_cl = client_data->loader_ishtp_cl; dev_dbg(cl_data_to_dev(client_data), "%s: command=%02lx is_response=%u status=%02x\n", __func__, out_hdr->command & CMD_MASK, out_hdr->command & IS_RESPONSE ? 1 : 0, out_hdr->status); /* Setup in coming buffer & size */ client_data->response.data = in_msg; client_data->response.max_size = in_size; client_data->response.error = 0; client_data->response.received = false; rv = ishtp_cl_send(loader_ishtp_cl, out_msg, out_size); if (rv < 0) { dev_err(cl_data_to_dev(client_data), "ishtp_cl_send error %d\n", rv); return rv; } wait_event_interruptible_timeout(client_data->response.wait_queue, client_data->response.received, ISHTP_SEND_TIMEOUT); if (!client_data->response.received) { dev_err(cl_data_to_dev(client_data), "Timed out for response to command=%02lx", out_hdr->command & CMD_MASK); return -ETIMEDOUT; } if (client_data->response.error < 0) return client_data->response.error; return client_data->response.size; } /** * process_recv() - Receive and parse incoming packet * @loader_ishtp_cl: Client instance to get stats * @rb_in_proc: ISH received message buffer * * Parse the incoming packet. If it is a response packet then it will * update received and wake up the caller waiting to for the response. */ static void process_recv(struct ishtp_cl *loader_ishtp_cl, struct ishtp_cl_rb *rb_in_proc) { struct loader_msg_hdr *hdr; size_t data_len = rb_in_proc->buf_idx; struct ishtp_cl_data *client_data = ishtp_get_client_data(loader_ishtp_cl); /* Sanity check */ if (!client_data->response.data) { dev_err(cl_data_to_dev(client_data), "Receiving buffer is null. Should be allocated by calling function\n"); client_data->response.error = -EINVAL; goto end; } if (client_data->response.received) { dev_err(cl_data_to_dev(client_data), "Previous firmware message not yet processed\n"); client_data->response.error = -EINVAL; goto end; } /* * All firmware messages have a header. Check buffer size * before accessing elements inside. */ if (!rb_in_proc->buffer.data) { dev_warn(cl_data_to_dev(client_data), "rb_in_proc->buffer.data returned null"); client_data->response.error = -EBADMSG; goto end; } if (data_len < sizeof(struct loader_msg_hdr)) { dev_err(cl_data_to_dev(client_data), "data size %zu is less than header %zu\n", data_len, sizeof(struct loader_msg_hdr)); client_data->response.error = -EMSGSIZE; goto end; } hdr = (struct loader_msg_hdr *)rb_in_proc->buffer.data; dev_dbg(cl_data_to_dev(client_data), "%s: command=%02lx is_response=%u status=%02x\n", __func__, hdr->command & CMD_MASK, hdr->command & IS_RESPONSE ? 1 : 0, hdr->status); if (((hdr->command & CMD_MASK) != LOADER_CMD_XFER_QUERY) && ((hdr->command & CMD_MASK) != LOADER_CMD_XFER_FRAGMENT) && ((hdr->command & CMD_MASK) != LOADER_CMD_START)) { dev_err(cl_data_to_dev(client_data), "Invalid command=%02lx\n", hdr->command & CMD_MASK); client_data->response.error = -EPROTO; goto end; } if (data_len > client_data->response.max_size) { dev_err(cl_data_to_dev(client_data), "Received buffer size %zu is larger than allocated buffer %zu\n", data_len, client_data->response.max_size); client_data->response.error = -EMSGSIZE; goto end; } /* We expect only "response" messages from firmware */ if (!(hdr->command & IS_RESPONSE)) { dev_err(cl_data_to_dev(client_data), "Invalid response to command\n"); client_data->response.error = -EIO; goto end; } if (hdr->status) { dev_err(cl_data_to_dev(client_data), "Loader returned status %d\n", hdr->status); client_data->response.error = -EIO; goto end; } /* Update the actual received buffer size */ client_data->response.size = data_len; /* * Copy the buffer received in firmware response for the * calling thread. */ memcpy(client_data->response.data, rb_in_proc->buffer.data, data_len); /* Set flag before waking up the caller */ client_data->response.received = true; end: /* Free the buffer */ ishtp_cl_io_rb_recycle(rb_in_proc); rb_in_proc = NULL; /* Wake the calling thread */ wake_up_interruptible(&client_data->response.wait_queue); } /** * loader_cl_event_cb() - bus driver callback for incoming message * @cl_device: Pointer to the ishtp client device for which this * message is targeted * * Remove the packet from the list and process the message by calling * process_recv */ static void loader_cl_event_cb(struct ishtp_cl_device *cl_device) { struct ishtp_cl_rb *rb_in_proc; struct ishtp_cl *loader_ishtp_cl = ishtp_get_drvdata(cl_device); while ((rb_in_proc = ishtp_cl_rx_get_rb(loader_ishtp_cl)) != NULL) { /* Process the data packet from firmware */ process_recv(loader_ishtp_cl, rb_in_proc); } } /** * ish_query_loader_prop() - Query ISH Shim firmware loader * @client_data: Client data instance * @fw: Pointer to firmware data struct in host memory * @fw_info: Loader firmware properties * * This function queries the ISH Shim firmware loader for capabilities. * * Return: 0 for success, negative error code for failure. */ static int ish_query_loader_prop(struct ishtp_cl_data *client_data, const struct firmware *fw, struct shim_fw_info *fw_info) { int rv; struct loader_xfer_query ldr_xfer_query; struct loader_xfer_query_response ldr_xfer_query_resp; memset(&ldr_xfer_query, 0, sizeof(ldr_xfer_query)); ldr_xfer_query.hdr.command = LOADER_CMD_XFER_QUERY; ldr_xfer_query.image_size = fw->size; rv = loader_cl_send(client_data, (u8 *)&ldr_xfer_query, sizeof(ldr_xfer_query), (u8 *)&ldr_xfer_query_resp, sizeof(ldr_xfer_query_resp)); if (rv < 0) { client_data->flag_retry = true; *fw_info = (struct shim_fw_info){}; return rv; } /* On success, the return value is the received buffer size */ if (rv != sizeof(struct loader_xfer_query_response)) { dev_err(cl_data_to_dev(client_data), "data size %d is not equal to size of loader_xfer_query_response %zu\n", rv, sizeof(struct loader_xfer_query_response)); client_data->flag_retry = true; *fw_info = (struct shim_fw_info){}; return -EMSGSIZE; } /* Save fw_info for use outside this function */ *fw_info = ldr_xfer_query_resp.fw_info; /* Loader firmware properties */ dev_dbg(cl_data_to_dev(client_data), "ish_fw_version: major=%d minor=%d hotfix=%d build=%d protocol_version=0x%x loader_version=%d\n", fw_info->ish_fw_version.major, fw_info->ish_fw_version.minor, fw_info->ish_fw_version.hotfix, fw_info->ish_fw_version.build, fw_info->protocol_version, fw_info->ldr_version.value); dev_dbg(cl_data_to_dev(client_data), "loader_capability: max_fw_image_size=0x%x xfer_mode=%d max_dma_buf_size=0x%x dma_buf_size_limit=0x%x\n", fw_info->ldr_capability.max_fw_image_size, fw_info->ldr_capability.xfer_mode, fw_info->ldr_capability.max_dma_buf_size, dma_buf_size_limit); /* Sanity checks */ if (fw_info->ldr_capability.max_fw_image_size < fw->size) { dev_err(cl_data_to_dev(client_data), "ISH firmware size %zu is greater than Shim firmware loader max supported %d\n", fw->size, fw_info->ldr_capability.max_fw_image_size); return -ENOSPC; } /* For DMA the buffer size should be multiple of cacheline size */ if ((fw_info->ldr_capability.xfer_mode & LOADER_XFER_MODE_DIRECT_DMA) && (fw_info->ldr_capability.max_dma_buf_size % L1_CACHE_BYTES)) { dev_err(cl_data_to_dev(client_data), "Shim firmware loader buffer size %d should be multiple of cacheline\n", fw_info->ldr_capability.max_dma_buf_size); return -EINVAL; } return 0; } /** * ish_fw_xfer_ishtp() - Loads ISH firmware using ishtp interface * @client_data: Client data instance * @fw: Pointer to firmware data struct in host memory * * This function uses ISH-TP to transfer ISH firmware from host to * ISH SRAM. Lower layers may use IPC or DMA depending on firmware * support. * * Return: 0 for success, negative error code for failure. */ static int ish_fw_xfer_ishtp(struct ishtp_cl_data *client_data, const struct firmware *fw) { int rv; u32 fragment_offset, fragment_size, payload_max_size; struct loader_xfer_ipc_fragment *ldr_xfer_ipc_frag; struct loader_msg_hdr ldr_xfer_ipc_ack; payload_max_size = LOADER_SHIM_IPC_BUF_SIZE - IPC_FRAGMENT_DATA_PREAMBLE; ldr_xfer_ipc_frag = kzalloc(LOADER_SHIM_IPC_BUF_SIZE, GFP_KERNEL); if (!ldr_xfer_ipc_frag) { client_data->flag_retry = true; return -ENOMEM; } ldr_xfer_ipc_frag->fragment.hdr.command = LOADER_CMD_XFER_FRAGMENT; ldr_xfer_ipc_frag->fragment.xfer_mode = LOADER_XFER_MODE_ISHTP; /* Break the firmware image into fragments and send as ISH-TP payload */ fragment_offset = 0; while (fragment_offset < fw->size) { if (fragment_offset + payload_max_size < fw->size) { fragment_size = payload_max_size; ldr_xfer_ipc_frag->fragment.is_last = 0; } else { fragment_size = fw->size - fragment_offset; ldr_xfer_ipc_frag->fragment.is_last = 1; } ldr_xfer_ipc_frag->fragment.offset = fragment_offset; ldr_xfer_ipc_frag->fragment.size = fragment_size; memcpy(ldr_xfer_ipc_frag->data, &fw->data[fragment_offset], fragment_size); dev_dbg(cl_data_to_dev(client_data), "xfer_mode=ipc offset=0x%08x size=0x%08x is_last=%d\n", ldr_xfer_ipc_frag->fragment.offset, ldr_xfer_ipc_frag->fragment.size, ldr_xfer_ipc_frag->fragment.is_last); rv = loader_cl_send(client_data, (u8 *)ldr_xfer_ipc_frag, IPC_FRAGMENT_DATA_PREAMBLE + fragment_size, (u8 *)&ldr_xfer_ipc_ack, sizeof(ldr_xfer_ipc_ack)); if (rv < 0) { client_data->flag_retry = true; goto end_err_resp_buf_release; } fragment_offset += fragment_size; } kfree(ldr_xfer_ipc_frag); return 0; end_err_resp_buf_release: /* Free ISH buffer if not done already, in error case */ kfree(ldr_xfer_ipc_frag); return rv; } /** * ish_fw_xfer_direct_dma() - Loads ISH firmware using direct dma * @client_data: Client data instance * @fw: Pointer to firmware data struct in host memory * @fw_info: Loader firmware properties * * Host firmware load is a unique case where we need to download * a large firmware image (200+ Kb). This function implements * direct DMA transfer in kernel and ISH firmware. This allows * us to overcome the ISH-TP 4 Kb limit, and allows us to DMA * directly to ISH UMA at location of choice. * Function depends on corresponding support in ISH firmware. * * Return: 0 for success, negative error code for failure. */ static int ish_fw_xfer_direct_dma(struct ishtp_cl_data *client_data, const struct firmware *fw, const struct shim_fw_info fw_info) { int rv = 0; void *dma_buf; dma_addr_t dma_buf_phy; u32 fragment_offset, fragment_size, payload_max_size; struct loader_msg_hdr ldr_xfer_dma_frag_ack; struct loader_xfer_dma_fragment ldr_xfer_dma_frag; struct device *devc = ishtp_get_pci_device(client_data->cl_device); u32 shim_fw_buf_size = fw_info.ldr_capability.max_dma_buf_size; /* * payload_max_size should be set to minimum of * (1) Size of firmware to be loaded, * (2) Max DMA buffer size supported by Shim firmware, * (3) DMA buffer size limit set by boot_param dma_buf_size_limit. */ payload_max_size = min3(fw->size, (size_t)shim_fw_buf_size, (size_t)dma_buf_size_limit); /* * Buffer size should be multiple of cacheline size * if it's not, select the previous cacheline boundary. */ payload_max_size &= ~(L1_CACHE_BYTES - 1); dma_buf = dma_alloc_coherent(devc, payload_max_size, &dma_buf_phy, GFP_KERNEL); if (!dma_buf) { client_data->flag_retry = true; return -ENOMEM; } ldr_xfer_dma_frag.fragment.hdr.command = LOADER_CMD_XFER_FRAGMENT; ldr_xfer_dma_frag.fragment.xfer_mode = LOADER_XFER_MODE_DIRECT_DMA; ldr_xfer_dma_frag.ddr_phys_addr = (u64)dma_buf_phy; /* Send the firmware image in chucks of payload_max_size */ fragment_offset = 0; while (fragment_offset < fw->size) { if (fragment_offset + payload_max_size < fw->size) { fragment_size = payload_max_size; ldr_xfer_dma_frag.fragment.is_last = 0; } else { fragment_size = fw->size - fragment_offset; ldr_xfer_dma_frag.fragment.is_last = 1; } ldr_xfer_dma_frag.fragment.offset = fragment_offset; ldr_xfer_dma_frag.fragment.size = fragment_size; memcpy(dma_buf, &fw->data[fragment_offset], fragment_size); /* Flush cache to be sure the data is in main memory. */ clflush_cache_range(dma_buf, payload_max_size); dev_dbg(cl_data_to_dev(client_data), "xfer_mode=dma offset=0x%08x size=0x%x is_last=%d ddr_phys_addr=0x%016llx\n", ldr_xfer_dma_frag.fragment.offset, ldr_xfer_dma_frag.fragment.size, ldr_xfer_dma_frag.fragment.is_last, ldr_xfer_dma_frag.ddr_phys_addr); rv = loader_cl_send(client_data, (u8 *)&ldr_xfer_dma_frag, sizeof(ldr_xfer_dma_frag), (u8 *)&ldr_xfer_dma_frag_ack, sizeof(ldr_xfer_dma_frag_ack)); if (rv < 0) { client_data->flag_retry = true; goto end_err_resp_buf_release; } fragment_offset += fragment_size; } end_err_resp_buf_release: dma_free_coherent(devc, payload_max_size, dma_buf, dma_buf_phy); return rv; } /** * ish_fw_start() - Start executing ISH main firmware * @client_data: client data instance * * This function sends message to Shim firmware loader to start * the execution of ISH main firmware. * * Return: 0 for success, negative error code for failure. */ static int ish_fw_start(struct ishtp_cl_data *client_data) { struct loader_start ldr_start; struct loader_msg_hdr ldr_start_ack; memset(&ldr_start, 0, sizeof(ldr_start)); ldr_start.hdr.command = LOADER_CMD_START; return loader_cl_send(client_data, (u8 *)&ldr_start, sizeof(ldr_start), (u8 *)&ldr_start_ack, sizeof(ldr_start_ack)); } /** * load_fw_from_host() - Loads ISH firmware from host * @client_data: Client data instance * * This function loads the ISH firmware to ISH SRAM and starts execution * * Return: 0 for success, negative error code for failure. */ static int load_fw_from_host(struct ishtp_cl_data *client_data) { int rv; u32 xfer_mode; char *filename; const struct firmware *fw; struct shim_fw_info fw_info; struct ishtp_cl *loader_ishtp_cl = client_data->loader_ishtp_cl; client_data->flag_retry = false; filename = kzalloc(FILENAME_SIZE, GFP_KERNEL); if (!filename) { client_data->flag_retry = true; rv = -ENOMEM; goto end_error; } /* Get filename of the ISH firmware to be loaded */ rv = get_firmware_variant(client_data, filename); if (rv < 0) goto end_err_filename_buf_release; rv = request_firmware(&fw, filename, cl_data_to_dev(client_data)); if (rv < 0) goto end_err_filename_buf_release; /* Step 1: Query Shim firmware loader properties */ rv = ish_query_loader_prop(client_data, fw, &fw_info); if (rv < 0) goto end_err_fw_release; /* Step 2: Send the main firmware image to be loaded, to ISH SRAM */ xfer_mode = fw_info.ldr_capability.xfer_mode; if (xfer_mode & LOADER_XFER_MODE_DIRECT_DMA) { rv = ish_fw_xfer_direct_dma(client_data, fw, fw_info); } else if (xfer_mode & LOADER_XFER_MODE_ISHTP) { rv = ish_fw_xfer_ishtp(client_data, fw); } else { dev_err(cl_data_to_dev(client_data), "No transfer mode selected in firmware\n"); rv = -EINVAL; } if (rv < 0) goto end_err_fw_release; /* Step 3: Start ISH main firmware execution */ rv = ish_fw_start(client_data); if (rv < 0) goto end_err_fw_release; release_firmware(fw); dev_info(cl_data_to_dev(client_data), "ISH firmware %s loaded\n", filename); kfree(filename); return 0; end_err_fw_release: release_firmware(fw); end_err_filename_buf_release: kfree(filename); end_error: /* Keep a count of retries, and give up after 3 attempts */ if (client_data->flag_retry && client_data->retry_count++ < MAX_LOAD_ATTEMPTS) { dev_warn(cl_data_to_dev(client_data), "ISH host firmware load failed %d. Resetting ISH, and trying again..\n", rv); ish_hw_reset(ishtp_get_ishtp_device(loader_ishtp_cl)); } else { dev_err(cl_data_to_dev(client_data), "ISH host firmware load failed %d\n", rv); } return rv; } static void load_fw_from_host_handler(struct work_struct *work) { struct ishtp_cl_data *client_data; client_data = container_of(work, struct ishtp_cl_data, work_fw_load); load_fw_from_host(client_data); } /** * loader_init() - Init function for ISH-TP client * @loader_ishtp_cl: ISH-TP client instance * @reset: true if called for init after reset * * Return: 0 for success, negative error code for failure */ static int loader_init(struct ishtp_cl *loader_ishtp_cl, bool reset) { int rv; struct ishtp_cl_data *client_data = ishtp_get_client_data(loader_ishtp_cl); dev_dbg(cl_data_to_dev(client_data), "reset flag: %d\n", reset); rv = ishtp_cl_establish_connection(loader_ishtp_cl, &loader_ishtp_id_table[0].guid, LOADER_CL_TX_RING_SIZE, LOADER_CL_RX_RING_SIZE, reset); if (rv < 0) { dev_err(cl_data_to_dev(client_data), "Client connect fail\n"); goto err_cl_disconnect; } dev_dbg(cl_data_to_dev(client_data), "Client connected\n"); ishtp_register_event_cb(client_data->cl_device, loader_cl_event_cb); return 0; err_cl_disconnect: ishtp_cl_destroy_connection(loader_ishtp_cl, reset); return rv; } static void loader_deinit(struct ishtp_cl *loader_ishtp_cl) { ishtp_cl_destroy_connection(loader_ishtp_cl, false); /* Disband and free all Tx and Rx client-level rings */ ishtp_cl_free(loader_ishtp_cl); } static void reset_handler(struct work_struct *work) { int rv; struct ishtp_cl_data *client_data; struct ishtp_cl *loader_ishtp_cl; struct ishtp_cl_device *cl_device; client_data = container_of(work, struct ishtp_cl_data, work_ishtp_reset); loader_ishtp_cl = client_data->loader_ishtp_cl; cl_device = client_data->cl_device; ishtp_cl_destroy_connection(loader_ishtp_cl, true); rv = loader_init(loader_ishtp_cl, 1); if (rv < 0) { dev_err(ishtp_device(cl_device), "Reset Failed\n"); return; } /* ISH firmware loading from host */ load_fw_from_host(client_data); } /** * loader_ishtp_cl_probe() - ISH-TP client driver probe * @cl_device: ISH-TP client device instance * * This function gets called on device create on ISH-TP bus * * Return: 0 for success, negative error code for failure */ static int loader_ishtp_cl_probe(struct ishtp_cl_device *cl_device) { struct ishtp_cl *loader_ishtp_cl; struct ishtp_cl_data *client_data; int rv; client_data = devm_kzalloc(ishtp_device(cl_device), sizeof(*client_data), GFP_KERNEL); if (!client_data) return -ENOMEM; loader_ishtp_cl = ishtp_cl_allocate(cl_device); if (!loader_ishtp_cl) return -ENOMEM; ishtp_set_drvdata(cl_device, loader_ishtp_cl); ishtp_set_client_data(loader_ishtp_cl, client_data); client_data->loader_ishtp_cl = loader_ishtp_cl; client_data->cl_device = cl_device; init_waitqueue_head(&client_data->response.wait_queue); INIT_WORK(&client_data->work_ishtp_reset, reset_handler); INIT_WORK(&client_data->work_fw_load, load_fw_from_host_handler); rv = loader_init(loader_ishtp_cl, false); if (rv < 0) { ishtp_cl_free(loader_ishtp_cl); return rv; } ishtp_get_device(cl_device); client_data->retry_count = 0; /* ISH firmware loading from host */ schedule_work(&client_data->work_fw_load); return 0; } /** * loader_ishtp_cl_remove() - ISH-TP client driver remove * @cl_device: ISH-TP client device instance * * This function gets called on device remove on ISH-TP bus * * Return: 0 */ static void loader_ishtp_cl_remove(struct ishtp_cl_device *cl_device) { struct ishtp_cl_data *client_data; struct ishtp_cl *loader_ishtp_cl = ishtp_get_drvdata(cl_device); client_data = ishtp_get_client_data(loader_ishtp_cl); /* * The sequence of the following two cancel_work_sync() is * important. The work_fw_load can in turn schedue * work_ishtp_reset, so first cancel work_fw_load then * cancel work_ishtp_reset. */ cancel_work_sync(&client_data->work_fw_load); cancel_work_sync(&client_data->work_ishtp_reset); loader_deinit(loader_ishtp_cl); ishtp_put_device(cl_device); } /** * loader_ishtp_cl_reset() - ISH-TP client driver reset * @cl_device: ISH-TP client device instance * * This function gets called on device reset on ISH-TP bus * * Return: 0 */ static int loader_ishtp_cl_reset(struct ishtp_cl_device *cl_device) { struct ishtp_cl_data *client_data; struct ishtp_cl *loader_ishtp_cl = ishtp_get_drvdata(cl_device); client_data = ishtp_get_client_data(loader_ishtp_cl); schedule_work(&client_data->work_ishtp_reset); return 0; } static struct ishtp_cl_driver loader_ishtp_cl_driver = { .name = "ish-loader", .id = loader_ishtp_id_table, .probe = loader_ishtp_cl_probe, .remove = loader_ishtp_cl_remove, .reset = loader_ishtp_cl_reset, }; static int __init ish_loader_init(void) { return ishtp_cl_driver_register(&loader_ishtp_cl_driver, THIS_MODULE); } static void __exit ish_loader_exit(void) { ishtp_cl_driver_unregister(&loader_ishtp_cl_driver); } late_initcall(ish_loader_init); module_exit(ish_loader_exit); module_param(dma_buf_size_limit, int, 0644); MODULE_PARM_DESC(dma_buf_size_limit, "Limit the DMA buf size to this value in bytes"); MODULE_DESCRIPTION("ISH ISH-TP Host firmware Loader Client Driver"); MODULE_AUTHOR("Rushikesh S Kadam "); MODULE_LICENSE("GPL v2");