drivers/soc/qcom/wcnss_ctrl.c

   1 /*
   2  * Copyright (c) 2016, Linaro Ltd.
   3  * Copyright (c) 2015, Sony Mobile Communications Inc.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 and
   7  * only version 2 as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14 #include <linux/firmware.h>
  15 #include <linux/module.h>
  16 #include <linux/slab.h>
  17 #include <linux/io.h>
  18 #include <linux/of_platform.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/rpmsg.h>
  21 #include <linux/soc/qcom/wcnss_ctrl.h>
  22
  23 #define WCNSS_REQUEST_TIMEOUT   (5 * HZ)
  24 #define WCNSS_CBC_TIMEOUT       (10 * HZ)
  25
  26 #define WCNSS_ACK_DONE_BOOTING  1
  27 #define WCNSS_ACK_COLD_BOOTING  2
  28
  29 #define NV_FRAGMENT_SIZE        3072
  30 #define NVBIN_FILE              "wlan/prima/WCNSS_qcom_wlan_nv.bin"
  31
  32 /**
  33  * struct wcnss_ctrl - driver context
  34  * @dev:        device handle
  35  * @channel:    SMD channel handle
  36  * @ack:        completion for outstanding requests
  37  * @cbc:        completion for cbc complete indication
  38  * @ack_status: status of the outstanding request
  39  * @probe_work: worker for uploading nv binary
  40  */
  41 struct wcnss_ctrl {
  42         struct device *dev;
  43         struct rpmsg_endpoint *channel;
  44
  45         struct completion ack;
  46         struct completion cbc;
  47         int ack_status;
  48
  49         struct work_struct probe_work;
  50 };
  51
  52 /* message types */
  53 enum {
  54         WCNSS_VERSION_REQ = 0x01000000,
  55         WCNSS_VERSION_RESP,
  56         WCNSS_DOWNLOAD_NV_REQ,
  57         WCNSS_DOWNLOAD_NV_RESP,
  58         WCNSS_UPLOAD_CAL_REQ,
  59         WCNSS_UPLOAD_CAL_RESP,
  60         WCNSS_DOWNLOAD_CAL_REQ,
  61         WCNSS_DOWNLOAD_CAL_RESP,
  62         WCNSS_VBAT_LEVEL_IND,
  63         WCNSS_BUILD_VERSION_REQ,
  64         WCNSS_BUILD_VERSION_RESP,
  65         WCNSS_PM_CONFIG_REQ,
  66         WCNSS_CBC_COMPLETE_IND,
  67 };
  68
  69 /**
  70  * struct wcnss_msg_hdr - common packet header for requests and responses
  71  * @type:       packet message type
  72  * @len:        total length of the packet, including this header
  73  */
  74 struct wcnss_msg_hdr {
  75         u32 type;
  76         u32 len;
  77 } __packed;
  78
  79 /**
  80  * struct wcnss_version_resp - version request response
  81  * @hdr:        common packet wcnss_msg_hdr header
  82  */
  83 struct wcnss_version_resp {
  84         struct wcnss_msg_hdr hdr;
  85         u8 major;
  86         u8 minor;
  87         u8 version;
  88         u8 revision;
  89 } __packed;
  90
  91 /**
  92  * struct wcnss_download_nv_req - firmware fragment request
  93  * @hdr:        common packet wcnss_msg_hdr header
  94  * @seq:        sequence number of this fragment
  95  * @last:       boolean indicator of this being the last fragment of the binary
  96  * @frag_size:  length of this fragment
  97  * @fragment:   fragment data
  98  */
  99 struct wcnss_download_nv_req {
 100         struct wcnss_msg_hdr hdr;
 101         u16 seq;
 102         u16 last;
 103         u32 frag_size;
 104         u8 fragment[];
 105 } __packed;
 106
 107 /**
 108  * struct wcnss_download_nv_resp - firmware download response
 109  * @hdr:        common packet wcnss_msg_hdr header
 110  * @status:     boolean to indicate success of the download
 111  */
 112 struct wcnss_download_nv_resp {
 113         struct wcnss_msg_hdr hdr;
 114         u8 status;
 115 } __packed;
 116
 117 /**
 118  * wcnss_ctrl_smd_callback() - handler from SMD responses
 119  * @channel:    smd channel handle
 120  * @data:       pointer to the incoming data packet
 121  * @count:      size of the incoming data packet
 122  *
 123  * Handles any incoming packets from the remote WCNSS_CTRL service.
 124  */
 125 static int wcnss_ctrl_smd_callback(struct rpmsg_device *rpdev,
 126                                    void *data,
 127                                    int count,
 128                                    void *priv,
 129                                    u32 addr)
 130 {
 131         struct wcnss_ctrl *wcnss = dev_get_drvdata(&rpdev->dev);
 132         const struct wcnss_download_nv_resp *nvresp;
 133         const struct wcnss_version_resp *version;
 134         const struct wcnss_msg_hdr *hdr = data;
 135
 136         switch (hdr->type) {
 137         case WCNSS_VERSION_RESP:
 138                 if (count != sizeof(*version)) {
 139                         dev_err(wcnss->dev,
 140                                 "invalid size of version response\n");
 141                         break;
 142                 }
 143
 144                 version = data;
 145                 dev_info(wcnss->dev, "WCNSS Version %d.%d %d.%d\n",
 146                          version->major, version->minor,
 147                          version->version, version->revision);
 148
 149                 complete(&wcnss->ack);
 150                 break;
 151         case WCNSS_DOWNLOAD_NV_RESP:
 152                 if (count != sizeof(*nvresp)) {
 153                         dev_err(wcnss->dev,
 154                                 "invalid size of download response\n");
 155                         break;
 156                 }
 157
 158                 nvresp = data;
 159                 wcnss->ack_status = nvresp->status;
 160                 complete(&wcnss->ack);
 161                 break;
 162         case WCNSS_CBC_COMPLETE_IND:
 163                 dev_dbg(wcnss->dev, "cold boot complete\n");
 164                 complete(&wcnss->cbc);
 165                 break;
 166         default:
 167                 dev_info(wcnss->dev, "unknown message type %d\n", hdr->type);
 168                 break;
 169         }
 170
 171         return 0;
 172 }
 173
 174 /**
 175  * wcnss_request_version() - send a version request to WCNSS
 176  * @wcnss:      wcnss ctrl driver context
 177  */
 178 static int wcnss_request_version(struct wcnss_ctrl *wcnss)
 179 {
 180         struct wcnss_msg_hdr msg;
 181         int ret;
 182
 183         msg.type = WCNSS_VERSION_REQ;
 184         msg.len = sizeof(msg);
 185         ret = rpmsg_send(wcnss->channel, &msg, sizeof(msg));
 186         if (ret < 0)
 187                 return ret;
 188
 189         ret = wait_for_completion_timeout(&wcnss->ack, WCNSS_CBC_TIMEOUT);
 190         if (!ret) {
 191                 dev_err(wcnss->dev, "timeout waiting for version response\n");
 192                 return -ETIMEDOUT;
 193         }
 194
 195         return 0;
 196 }
 197
 198 /**
 199  * wcnss_download_nv() - send nv binary to WCNSS
 200  * @wcnss:      wcnss_ctrl state handle
 201  * @expect_cbc: indicator to caller that an cbc event is expected
 202  *
 203  * Returns 0 on success. Negative errno on failure.
 204  */
 205 static int wcnss_download_nv(struct wcnss_ctrl *wcnss, bool *expect_cbc)
 206 {
 207         struct wcnss_download_nv_req *req;
 208         const struct firmware *fw;
 209         const void *data;
 210         ssize_t left;
 211         int ret;
 212
 213         req = kzalloc(sizeof(*req) + NV_FRAGMENT_SIZE, GFP_KERNEL);
 214         if (!req)
 215                 return -ENOMEM;
 216
 217         ret = request_firmware(&fw, NVBIN_FILE, wcnss->dev);
 218         if (ret < 0) {
 219                 dev_err(wcnss->dev, "Failed to load nv file %s: %d\n",
 220                         NVBIN_FILE, ret);
 221                 goto free_req;
 222         }
 223
 224         data = fw->data;
 225         left = fw->size;
 226
 227         req->hdr.type = WCNSS_DOWNLOAD_NV_REQ;
 228         req->hdr.len = sizeof(*req) + NV_FRAGMENT_SIZE;
 229
 230         req->last = 0;
 231         req->frag_size = NV_FRAGMENT_SIZE;
 232
 233         req->seq = 0;
 234         do {
 235                 if (left <= NV_FRAGMENT_SIZE) {
 236                         req->last = 1;
 237                         req->frag_size = left;
 238                         req->hdr.len = sizeof(*req) + left;
 239                 }
 240
 241                 memcpy(req->fragment, data, req->frag_size);
 242
 243                 ret = rpmsg_send(wcnss->channel, req, req->hdr.len);
 244                 if (ret < 0) {
 245                         dev_err(wcnss->dev, "failed to send smd packet\n");
 246                         goto release_fw;
 247                 }
 248
 249                 /* Increment for next fragment */
 250                 req->seq++;
 251
 252                 data += req->hdr.len;
 253                 left -= NV_FRAGMENT_SIZE;
 254         } while (left > 0);
 255
 256         ret = wait_for_completion_timeout(&wcnss->ack, WCNSS_REQUEST_TIMEOUT);
 257         if (!ret) {
 258                 dev_err(wcnss->dev, "timeout waiting for nv upload ack\n");
 259                 ret = -ETIMEDOUT;
 260         } else {
 261                 *expect_cbc = wcnss->ack_status == WCNSS_ACK_COLD_BOOTING;
 262                 ret = 0;
 263         }
 264
 265 release_fw:
 266         release_firmware(fw);
 267 free_req:
 268         kfree(req);
 269
 270         return ret;
 271 }
 272
 273 /**
 274  * qcom_wcnss_open_channel() - open additional SMD channel to WCNSS
 275  * @wcnss:      wcnss handle, retrieved from drvdata
 276  * @name:       SMD channel name
 277  * @cb:         callback to handle incoming data on the channel
 278  */
 279 struct rpmsg_endpoint *qcom_wcnss_open_channel(void *wcnss, const char *name, rpmsg_rx_cb_t cb, void *priv)
 280 {
 281         struct rpmsg_channel_info chinfo;
 282         struct wcnss_ctrl *_wcnss = wcnss;
 283
 284         strncpy(chinfo.name, name, sizeof(chinfo.name));
 285         chinfo.src = RPMSG_ADDR_ANY;
 286         chinfo.dst = RPMSG_ADDR_ANY;
 287
 288         return rpmsg_create_ept(_wcnss->channel->rpdev, cb, priv, chinfo);
 289 }
 290 EXPORT_SYMBOL(qcom_wcnss_open_channel);
 291
 292 static void wcnss_async_probe(struct work_struct *work)
 293 {
 294         struct wcnss_ctrl *wcnss = container_of(work, struct wcnss_ctrl, probe_work);
 295         bool expect_cbc;
 296         int ret;
 297
 298         ret = wcnss_request_version(wcnss);
 299         if (ret < 0)
 300                 return;
 301
 302         ret = wcnss_download_nv(wcnss, &expect_cbc);
 303         if (ret < 0)
 304                 return;
 305
 306         /* Wait for pending cold boot completion if indicated by the nv downloader */
 307         if (expect_cbc) {
 308                 ret = wait_for_completion_timeout(&wcnss->cbc, WCNSS_REQUEST_TIMEOUT);
 309                 if (!ret)
 310                         dev_err(wcnss->dev, "expected cold boot completion\n");
 311         }
 312
 313         of_platform_populate(wcnss->dev->of_node, NULL, NULL, wcnss->dev);
 314 }
 315
 316 static int wcnss_ctrl_probe(struct rpmsg_device *rpdev)
 317 {
 318         struct wcnss_ctrl *wcnss;
 319
 320         wcnss = devm_kzalloc(&rpdev->dev, sizeof(*wcnss), GFP_KERNEL);
 321         if (!wcnss)
 322                 return -ENOMEM;
 323
 324         wcnss->dev = &rpdev->dev;
 325         wcnss->channel = rpdev->ept;
 326
 327         init_completion(&wcnss->ack);
 328         init_completion(&wcnss->cbc);
 329         INIT_WORK(&wcnss->probe_work, wcnss_async_probe);
 330
 331         dev_set_drvdata(&rpdev->dev, wcnss);
 332
 333         schedule_work(&wcnss->probe_work);
 334
 335         return 0;
 336 }
 337
 338 static void wcnss_ctrl_remove(struct rpmsg_device *rpdev)
 339 {
 340         struct wcnss_ctrl *wcnss = dev_get_drvdata(&rpdev->dev);
 341
 342         cancel_work_sync(&wcnss->probe_work);
 343         of_platform_depopulate(&rpdev->dev);
 344 }
 345
 346 static const struct of_device_id wcnss_ctrl_of_match[] = {
 347         { .compatible = "qcom,wcnss", },
 348         {}
 349 };
 350
 351 static struct rpmsg_driver wcnss_ctrl_driver = {
 352         .probe = wcnss_ctrl_probe,
 353         .remove = wcnss_ctrl_remove,
 354         .callback = wcnss_ctrl_smd_callback,
 355         .drv  = {
 356                 .name  = "qcom_wcnss_ctrl",
 357                 .owner = THIS_MODULE,
 358                 .of_match_table = wcnss_ctrl_of_match,
 359         },
 360 };
 361
 362 module_rpmsg_driver(wcnss_ctrl_driver);
 363
 364 MODULE_DESCRIPTION("Qualcomm WCNSS control driver");
 365 MODULE_LICENSE("GPL v2");