![Bjorn Andersson](/assets/img/avatar_default.png)
By passing the smd channel reference to the callback, rather than the smd device, we can open additional smd channels from sub-devices of smd devices. Also updates the two smd clients today found in mainline. Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org> Signed-off-by: Andy Gross <andy.gross@linaro.org>
273 lines
6.4 KiB
C
273 lines
6.4 KiB
C
/*
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* Copyright (c) 2015, Sony Mobile Communications Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/firmware.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/soc/qcom/smd.h>
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#define WCNSS_REQUEST_TIMEOUT (5 * HZ)
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#define NV_FRAGMENT_SIZE 3072
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#define NVBIN_FILE "wlan/prima/WCNSS_qcom_wlan_nv.bin"
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/**
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* struct wcnss_ctrl - driver context
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* @dev: device handle
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* @channel: SMD channel handle
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* @ack: completion for outstanding requests
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* @ack_status: status of the outstanding request
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* @download_nv_work: worker for uploading nv binary
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*/
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struct wcnss_ctrl {
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struct device *dev;
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struct qcom_smd_channel *channel;
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struct completion ack;
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int ack_status;
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struct work_struct download_nv_work;
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};
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/* message types */
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enum {
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WCNSS_VERSION_REQ = 0x01000000,
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WCNSS_VERSION_RESP,
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WCNSS_DOWNLOAD_NV_REQ,
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WCNSS_DOWNLOAD_NV_RESP,
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WCNSS_UPLOAD_CAL_REQ,
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WCNSS_UPLOAD_CAL_RESP,
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WCNSS_DOWNLOAD_CAL_REQ,
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WCNSS_DOWNLOAD_CAL_RESP,
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};
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/**
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* struct wcnss_msg_hdr - common packet header for requests and responses
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* @type: packet message type
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* @len: total length of the packet, including this header
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*/
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struct wcnss_msg_hdr {
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u32 type;
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u32 len;
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} __packed;
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/**
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* struct wcnss_version_resp - version request response
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* @hdr: common packet wcnss_msg_hdr header
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*/
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struct wcnss_version_resp {
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struct wcnss_msg_hdr hdr;
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u8 major;
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u8 minor;
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u8 version;
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u8 revision;
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} __packed;
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/**
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* struct wcnss_download_nv_req - firmware fragment request
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* @hdr: common packet wcnss_msg_hdr header
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* @seq: sequence number of this fragment
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* @last: boolean indicator of this being the last fragment of the binary
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* @frag_size: length of this fragment
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* @fragment: fragment data
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*/
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struct wcnss_download_nv_req {
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struct wcnss_msg_hdr hdr;
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u16 seq;
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u16 last;
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u32 frag_size;
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u8 fragment[];
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} __packed;
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/**
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* struct wcnss_download_nv_resp - firmware download response
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* @hdr: common packet wcnss_msg_hdr header
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* @status: boolean to indicate success of the download
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*/
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struct wcnss_download_nv_resp {
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struct wcnss_msg_hdr hdr;
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u8 status;
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} __packed;
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/**
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* wcnss_ctrl_smd_callback() - handler from SMD responses
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* @channel: smd channel handle
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* @data: pointer to the incoming data packet
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* @count: size of the incoming data packet
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*
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* Handles any incoming packets from the remote WCNSS_CTRL service.
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*/
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static int wcnss_ctrl_smd_callback(struct qcom_smd_channel *channel,
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const void *data,
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size_t count)
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{
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struct wcnss_ctrl *wcnss = qcom_smd_get_drvdata(channel);
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const struct wcnss_download_nv_resp *nvresp;
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const struct wcnss_version_resp *version;
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const struct wcnss_msg_hdr *hdr = data;
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switch (hdr->type) {
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case WCNSS_VERSION_RESP:
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if (count != sizeof(*version)) {
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dev_err(wcnss->dev,
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"invalid size of version response\n");
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break;
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}
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version = data;
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dev_info(wcnss->dev, "WCNSS Version %d.%d %d.%d\n",
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version->major, version->minor,
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version->version, version->revision);
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schedule_work(&wcnss->download_nv_work);
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break;
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case WCNSS_DOWNLOAD_NV_RESP:
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if (count != sizeof(*nvresp)) {
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dev_err(wcnss->dev,
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"invalid size of download response\n");
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break;
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}
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nvresp = data;
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wcnss->ack_status = nvresp->status;
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complete(&wcnss->ack);
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break;
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default:
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dev_info(wcnss->dev, "unknown message type %d\n", hdr->type);
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break;
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}
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return 0;
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}
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/**
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* wcnss_request_version() - send a version request to WCNSS
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* @wcnss: wcnss ctrl driver context
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*/
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static int wcnss_request_version(struct wcnss_ctrl *wcnss)
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{
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struct wcnss_msg_hdr msg;
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msg.type = WCNSS_VERSION_REQ;
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msg.len = sizeof(msg);
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return qcom_smd_send(wcnss->channel, &msg, sizeof(msg));
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}
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/**
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* wcnss_download_nv() - send nv binary to WCNSS
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* @work: work struct to acquire wcnss context
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*/
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static void wcnss_download_nv(struct work_struct *work)
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{
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struct wcnss_ctrl *wcnss = container_of(work, struct wcnss_ctrl, download_nv_work);
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struct wcnss_download_nv_req *req;
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const struct firmware *fw;
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const void *data;
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ssize_t left;
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int ret;
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req = kzalloc(sizeof(*req) + NV_FRAGMENT_SIZE, GFP_KERNEL);
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if (!req)
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return;
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ret = request_firmware(&fw, NVBIN_FILE, wcnss->dev);
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if (ret) {
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dev_err(wcnss->dev, "Failed to load nv file %s: %d\n",
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NVBIN_FILE, ret);
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goto free_req;
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}
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data = fw->data;
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left = fw->size;
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req->hdr.type = WCNSS_DOWNLOAD_NV_REQ;
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req->hdr.len = sizeof(*req) + NV_FRAGMENT_SIZE;
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req->last = 0;
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req->frag_size = NV_FRAGMENT_SIZE;
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req->seq = 0;
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do {
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if (left <= NV_FRAGMENT_SIZE) {
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req->last = 1;
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req->frag_size = left;
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req->hdr.len = sizeof(*req) + left;
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}
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memcpy(req->fragment, data, req->frag_size);
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ret = qcom_smd_send(wcnss->channel, req, req->hdr.len);
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if (ret) {
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dev_err(wcnss->dev, "failed to send smd packet\n");
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goto release_fw;
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}
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/* Increment for next fragment */
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req->seq++;
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data += req->hdr.len;
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left -= NV_FRAGMENT_SIZE;
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} while (left > 0);
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ret = wait_for_completion_timeout(&wcnss->ack, WCNSS_REQUEST_TIMEOUT);
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if (!ret)
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dev_err(wcnss->dev, "timeout waiting for nv upload ack\n");
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else if (wcnss->ack_status != 1)
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dev_err(wcnss->dev, "nv upload response failed err: %d\n",
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wcnss->ack_status);
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release_fw:
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release_firmware(fw);
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free_req:
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kfree(req);
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}
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static int wcnss_ctrl_probe(struct qcom_smd_device *sdev)
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{
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struct wcnss_ctrl *wcnss;
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wcnss = devm_kzalloc(&sdev->dev, sizeof(*wcnss), GFP_KERNEL);
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if (!wcnss)
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return -ENOMEM;
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wcnss->dev = &sdev->dev;
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wcnss->channel = sdev->channel;
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init_completion(&wcnss->ack);
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INIT_WORK(&wcnss->download_nv_work, wcnss_download_nv);
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qcom_smd_set_drvdata(sdev->channel, wcnss);
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return wcnss_request_version(wcnss);
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}
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static const struct qcom_smd_id wcnss_ctrl_smd_match[] = {
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{ .name = "WCNSS_CTRL" },
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{}
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};
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static struct qcom_smd_driver wcnss_ctrl_driver = {
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.probe = wcnss_ctrl_probe,
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.callback = wcnss_ctrl_smd_callback,
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.smd_match_table = wcnss_ctrl_smd_match,
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.driver = {
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.name = "qcom_wcnss_ctrl",
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.owner = THIS_MODULE,
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},
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};
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module_qcom_smd_driver(wcnss_ctrl_driver);
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MODULE_DESCRIPTION("Qualcomm WCNSS control driver");
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MODULE_LICENSE("GPL v2");
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