drivers/net/wireless/ath/wil6210/main.c

   1 /*
   2  * Copyright (c) 2012 Qualcomm Atheros, Inc.
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 #include <linux/kernel.h>
  18 #include <linux/netdevice.h>
  19 #include <linux/sched.h>
  20 #include <linux/ieee80211.h>
  21 #include <linux/wireless.h>
  22 #include <linux/slab.h>
  23 #include <linux/moduleparam.h>
  24 #include <linux/if_arp.h>
  25
  26 #include "wil6210.h"
  27
  28 /*
  29  * Due to a hardware issue,
  30  * one has to read/write to/from NIC in 32-bit chunks;
  31  * regular memcpy_fromio and siblings will
  32  * not work on 64-bit platform - it uses 64-bit transactions
  33  *
  34  * Force 32-bit transactions to enable NIC on 64-bit platforms
  35  *
  36  * To avoid byte swap on big endian host, __raw_{read|write}l
  37  * should be used - {read|write}l would swap bytes to provide
  38  * little endian on PCI value in host endianness.
  39  */
  40 void wil_memcpy_fromio_32(void *dst, const volatile void __iomem *src,
  41                           size_t count)
  42 {
  43         u32 *d = dst;
  44         const volatile u32 __iomem *s = src;
  45
  46         /* size_t is unsigned, if (count%4 != 0) it will wrap */
  47         for (count += 4; count > 4; count -= 4)
  48                 *d++ = __raw_readl(s++);
  49 }
  50
  51 void wil_memcpy_toio_32(volatile void __iomem *dst, const void *src,
  52                         size_t count)
  53 {
  54         volatile u32 __iomem *d = dst;
  55         const u32 *s = src;
  56
  57         for (count += 4; count > 4; count -= 4)
  58                 __raw_writel(*s++, d++);
  59 }
  60
  61 static void _wil6210_disconnect(struct wil6210_priv *wil, void *bssid)
  62 {
  63         uint i;
  64         struct net_device *ndev = wil_to_ndev(wil);
  65         struct wireless_dev *wdev = wil->wdev;
  66
  67         wil_dbg_misc(wil, "%s()\n", __func__);
  68
  69         wil_link_off(wil);
  70         clear_bit(wil_status_fwconnected, &wil->status);
  71
  72         switch (wdev->sme_state) {
  73         case CFG80211_SME_CONNECTED:
  74                 cfg80211_disconnected(ndev, WLAN_STATUS_UNSPECIFIED_FAILURE,
  75                                       NULL, 0, GFP_KERNEL);
  76                 break;
  77         case CFG80211_SME_CONNECTING:
  78                 cfg80211_connect_result(ndev, bssid, NULL, 0, NULL, 0,
  79                                         WLAN_STATUS_UNSPECIFIED_FAILURE,
  80                                         GFP_KERNEL);
  81                 break;
  82         default:
  83                 break;
  84         }
  85
  86         for (i = 0; i < ARRAY_SIZE(wil->vring_tx); i++)
  87                 wil_vring_fini_tx(wil, i);
  88
  89         clear_bit(wil_status_dontscan, &wil->status);
  90 }
  91
  92 static void wil_disconnect_worker(struct work_struct *work)
  93 {
  94         struct wil6210_priv *wil = container_of(work,
  95                         struct wil6210_priv, disconnect_worker);
  96
  97         _wil6210_disconnect(wil, NULL);
  98 }
  99
 100 static void wil_connect_timer_fn(ulong x)
 101 {
 102         struct wil6210_priv *wil = (void *)x;
 103
 104         wil_dbg_misc(wil, "Connect timeout\n");
 105
 106         /* reschedule to thread context - disconnect won't
 107          * run from atomic context
 108          */
 109         schedule_work(&wil->disconnect_worker);
 110 }
 111
 112 static void wil_cache_mbox_regs(struct wil6210_priv *wil)
 113 {
 114         /* make shadow copy of registers that should not change on run time */
 115         wil_memcpy_fromio_32(&wil->mbox_ctl, wil->csr + HOST_MBOX,
 116                              sizeof(struct wil6210_mbox_ctl));
 117         wil_mbox_ring_le2cpus(&wil->mbox_ctl.rx);
 118         wil_mbox_ring_le2cpus(&wil->mbox_ctl.tx);
 119 }
 120
 121 int wil_priv_init(struct wil6210_priv *wil)
 122 {
 123         wil_dbg_misc(wil, "%s()\n", __func__);
 124
 125         mutex_init(&wil->mutex);
 126         mutex_init(&wil->wmi_mutex);
 127
 128         init_completion(&wil->wmi_ready);
 129
 130         wil->pending_connect_cid = -1;
 131         setup_timer(&wil->connect_timer, wil_connect_timer_fn, (ulong)wil);
 132
 133         INIT_WORK(&wil->wmi_connect_worker, wmi_connect_worker);
 134         INIT_WORK(&wil->disconnect_worker, wil_disconnect_worker);
 135         INIT_WORK(&wil->wmi_event_worker, wmi_event_worker);
 136
 137         INIT_LIST_HEAD(&wil->pending_wmi_ev);
 138         spin_lock_init(&wil->wmi_ev_lock);
 139
 140         wil->wmi_wq = create_singlethread_workqueue(WIL_NAME"_wmi");
 141         if (!wil->wmi_wq)
 142                 return -EAGAIN;
 143
 144         wil->wmi_wq_conn = create_singlethread_workqueue(WIL_NAME"_connect");
 145         if (!wil->wmi_wq_conn) {
 146                 destroy_workqueue(wil->wmi_wq);
 147                 return -EAGAIN;
 148         }
 149
 150         wil_cache_mbox_regs(wil);
 151
 152         return 0;
 153 }
 154
 155 void wil6210_disconnect(struct wil6210_priv *wil, void *bssid)
 156 {
 157         del_timer_sync(&wil->connect_timer);
 158         _wil6210_disconnect(wil, bssid);
 159 }
 160
 161 void wil_priv_deinit(struct wil6210_priv *wil)
 162 {
 163         cancel_work_sync(&wil->disconnect_worker);
 164         wil6210_disconnect(wil, NULL);
 165         wmi_event_flush(wil);
 166         destroy_workqueue(wil->wmi_wq_conn);
 167         destroy_workqueue(wil->wmi_wq);
 168 }
 169
 170 static void wil_target_reset(struct wil6210_priv *wil)
 171 {
 172         wil_dbg_misc(wil, "Resetting...\n");
 173
 174         /* register write */
 175 #define W(a, v) iowrite32(v, wil->csr + HOSTADDR(a))
 176         /* register set = read, OR, write */
 177 #define S(a, v) iowrite32(ioread32(wil->csr + HOSTADDR(a)) | v, \
 178                 wil->csr + HOSTADDR(a))
 179
 180         /* hpal_perst_from_pad_src_n_mask */
 181         S(RGF_USER_CLKS_CTL_SW_RST_MASK_0, BIT(6));
 182         /* car_perst_rst_src_n_mask */
 183         S(RGF_USER_CLKS_CTL_SW_RST_MASK_0, BIT(7));
 184
 185         W(RGF_USER_MAC_CPU_0,  BIT(1)); /* mac_cpu_man_rst */
 186         W(RGF_USER_USER_CPU_0, BIT(1)); /* user_cpu_man_rst */
 187
 188         msleep(100);
 189
 190         W(RGF_USER_CLKS_CTL_SW_RST_VEC_2, 0xFE000000);
 191         W(RGF_USER_CLKS_CTL_SW_RST_VEC_1, 0x0000003F);
 192         W(RGF_USER_CLKS_CTL_SW_RST_VEC_3, 0x00000170);
 193         W(RGF_USER_CLKS_CTL_SW_RST_VEC_0, 0xFFE7FC00);
 194
 195         msleep(100);
 196
 197         W(RGF_USER_CLKS_CTL_SW_RST_VEC_3, 0);
 198         W(RGF_USER_CLKS_CTL_SW_RST_VEC_2, 0);
 199         W(RGF_USER_CLKS_CTL_SW_RST_VEC_1, 0);
 200         W(RGF_USER_CLKS_CTL_SW_RST_VEC_0, 0);
 201
 202         W(RGF_USER_CLKS_CTL_SW_RST_VEC_3, 0x00000001);
 203         W(RGF_USER_CLKS_CTL_SW_RST_VEC_2, 0x00000080);
 204         W(RGF_USER_CLKS_CTL_SW_RST_VEC_0, 0);
 205
 206         msleep(2000);
 207
 208         W(RGF_USER_USER_CPU_0, BIT(0)); /* user_cpu_man_de_rst */
 209
 210         msleep(2000);
 211
 212         wil_dbg_misc(wil, "Reset completed\n");
 213
 214 #undef W
 215 #undef S
 216 }
 217
 218 void wil_mbox_ring_le2cpus(struct wil6210_mbox_ring *r)
 219 {
 220         le32_to_cpus(&r->base);
 221         le16_to_cpus(&r->entry_size);
 222         le16_to_cpus(&r->size);
 223         le32_to_cpus(&r->tail);
 224         le32_to_cpus(&r->head);
 225 }
 226
 227 static int wil_wait_for_fw_ready(struct wil6210_priv *wil)
 228 {
 229         ulong to = msecs_to_jiffies(1000);
 230         ulong left = wait_for_completion_timeout(&wil->wmi_ready, to);
 231         if (0 == left) {
 232                 wil_err(wil, "Firmware not ready\n");
 233                 return -ETIME;
 234         } else {
 235                 wil_dbg_misc(wil, "FW ready after %d ms\n",
 236                              jiffies_to_msecs(to-left));
 237         }
 238         return 0;
 239 }
 240
 241 /*
 242  * We reset all the structures, and we reset the UMAC.
 243  * After calling this routine, you're expected to reload
 244  * the firmware.
 245  */
 246 int wil_reset(struct wil6210_priv *wil)
 247 {
 248         int rc;
 249
 250         cancel_work_sync(&wil->disconnect_worker);
 251         wil6210_disconnect(wil, NULL);
 252
 253         wil6210_disable_irq(wil);
 254         wil->status = 0;
 255
 256         wmi_event_flush(wil);
 257
 258         flush_workqueue(wil->wmi_wq_conn);
 259         flush_workqueue(wil->wmi_wq);
 260
 261         /* TODO: put MAC in reset */
 262         wil_target_reset(wil);
 263
 264         /* init after reset */
 265         wil->pending_connect_cid = -1;
 266         INIT_COMPLETION(wil->wmi_ready);
 267
 268         wil_cache_mbox_regs(wil);
 269
 270         /* TODO: release MAC reset */
 271         wil6210_enable_irq(wil);
 272
 273         /* we just started MAC, wait for FW ready */
 274         rc = wil_wait_for_fw_ready(wil);
 275
 276         return rc;
 277 }
 278
 279
 280 void wil_link_on(struct wil6210_priv *wil)
 281 {
 282         struct net_device *ndev = wil_to_ndev(wil);
 283
 284         wil_dbg_misc(wil, "%s()\n", __func__);
 285
 286         netif_carrier_on(ndev);
 287         netif_tx_wake_all_queues(ndev);
 288 }
 289
 290 void wil_link_off(struct wil6210_priv *wil)
 291 {
 292         struct net_device *ndev = wil_to_ndev(wil);
 293
 294         wil_dbg_misc(wil, "%s()\n", __func__);
 295
 296         netif_tx_stop_all_queues(ndev);
 297         netif_carrier_off(ndev);
 298 }
 299
 300 static int __wil_up(struct wil6210_priv *wil)
 301 {
 302         struct net_device *ndev = wil_to_ndev(wil);
 303         struct wireless_dev *wdev = wil->wdev;
 304         struct ieee80211_channel *channel = wdev->preset_chandef.chan;
 305         int rc;
 306         int bi;
 307         u16 wmi_nettype = wil_iftype_nl2wmi(wdev->iftype);
 308
 309         rc = wil_reset(wil);
 310         if (rc)
 311                 return rc;
 312
 313         /* FIXME Firmware works now in PBSS mode(ToDS=0, FromDS=0) */
 314         wmi_nettype = wil_iftype_nl2wmi(NL80211_IFTYPE_ADHOC);
 315         switch (wdev->iftype) {
 316         case NL80211_IFTYPE_STATION:
 317                 wil_dbg_misc(wil, "type: STATION\n");
 318                 bi = 0;
 319                 ndev->type = ARPHRD_ETHER;
 320                 break;
 321         case NL80211_IFTYPE_AP:
 322                 wil_dbg_misc(wil, "type: AP\n");
 323                 bi = 100;
 324                 ndev->type = ARPHRD_ETHER;
 325                 break;
 326         case NL80211_IFTYPE_P2P_CLIENT:
 327                 wil_dbg_misc(wil, "type: P2P_CLIENT\n");
 328                 bi = 0;
 329                 ndev->type = ARPHRD_ETHER;
 330                 break;
 331         case NL80211_IFTYPE_P2P_GO:
 332                 wil_dbg_misc(wil, "type: P2P_GO\n");
 333                 bi = 100;
 334                 ndev->type = ARPHRD_ETHER;
 335                 break;
 336         case NL80211_IFTYPE_MONITOR:
 337                 wil_dbg_misc(wil, "type: Monitor\n");
 338                 bi = 0;
 339                 ndev->type = ARPHRD_IEEE80211_RADIOTAP;
 340                 /* ARPHRD_IEEE80211 or ARPHRD_IEEE80211_RADIOTAP ? */
 341                 break;
 342         default:
 343                 return -EOPNOTSUPP;
 344         }
 345
 346         /* Apply profile in the following order: */
 347         /* SSID and channel for the AP */
 348         switch (wdev->iftype) {
 349         case NL80211_IFTYPE_AP:
 350         case NL80211_IFTYPE_P2P_GO:
 351                 if (wdev->ssid_len == 0) {
 352                         wil_err(wil, "SSID not set\n");
 353                         return -EINVAL;
 354                 }
 355                 wmi_set_ssid(wil, wdev->ssid_len, wdev->ssid);
 356                 if (channel)
 357                         wmi_set_channel(wil, channel->hw_value);
 358                 break;
 359         default:
 360                 break;
 361         }
 362
 363         /* MAC address - pre-requisite for other commands */
 364         wmi_set_mac_address(wil, ndev->dev_addr);
 365
 366         /* Set up beaconing if required. */
 367         rc = wmi_set_bcon(wil, bi, wmi_nettype);
 368         if (rc)
 369                 return rc;
 370
 371         /* Rx VRING. After MAC and beacon */
 372         wil_rx_init(wil);
 373
 374         return 0;
 375 }
 376
 377 int wil_up(struct wil6210_priv *wil)
 378 {
 379         int rc;
 380
 381         mutex_lock(&wil->mutex);
 382         rc = __wil_up(wil);
 383         mutex_unlock(&wil->mutex);
 384
 385         return rc;
 386 }
 387
 388 static int __wil_down(struct wil6210_priv *wil)
 389 {
 390         if (wil->scan_request) {
 391                 cfg80211_scan_done(wil->scan_request, true);
 392                 wil->scan_request = NULL;
 393         }
 394
 395         wil6210_disconnect(wil, NULL);
 396         wil_rx_fini(wil);
 397
 398         return 0;
 399 }
 400
 401 int wil_down(struct wil6210_priv *wil)
 402 {
 403         int rc;
 404
 405         mutex_lock(&wil->mutex);
 406         rc = __wil_down(wil);
 407         mutex_unlock(&wil->mutex);
 408
 409         return rc;
 410 }