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(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                 ;
  84         }
  85
  86         for (i = 0; i < ARRAY_SIZE(wil->vring_tx); i++)
  87                 wil_vring_fini_tx(wil, i);
  88 }
  89
  90 static void wil_disconnect_worker(struct work_struct *work)
  91 {
  92         struct wil6210_priv *wil = container_of(work,
  93                         struct wil6210_priv, disconnect_worker);
  94
  95         _wil6210_disconnect(wil, NULL);
  96 }
  97
  98 static void wil_connect_timer_fn(ulong x)
  99 {
 100         struct wil6210_priv *wil = (void *)x;
 101
 102         wil_dbg(wil, "Connect timeout\n");
 103
 104         /* reschedule to thread context - disconnect won't
 105          * run from atomic context
 106          */
 107         schedule_work(&wil->disconnect_worker);
 108 }
 109
 110 int wil_priv_init(struct wil6210_priv *wil)
 111 {
 112         wil_dbg(wil, "%s()\n", __func__);
 113
 114         mutex_init(&wil->mutex);
 115         mutex_init(&wil->wmi_mutex);
 116
 117         init_completion(&wil->wmi_ready);
 118
 119         wil->pending_connect_cid = -1;
 120         setup_timer(&wil->connect_timer, wil_connect_timer_fn, (ulong)wil);
 121
 122         INIT_WORK(&wil->wmi_connect_worker, wmi_connect_worker);
 123         INIT_WORK(&wil->disconnect_worker, wil_disconnect_worker);
 124         INIT_WORK(&wil->wmi_event_worker, wmi_event_worker);
 125
 126         INIT_LIST_HEAD(&wil->pending_wmi_ev);
 127         spin_lock_init(&wil->wmi_ev_lock);
 128
 129         wil->wmi_wq = create_singlethread_workqueue(WIL_NAME"_wmi");
 130         if (!wil->wmi_wq)
 131                 return -EAGAIN;
 132
 133         wil->wmi_wq_conn = create_singlethread_workqueue(WIL_NAME"_connect");
 134         if (!wil->wmi_wq_conn) {
 135                 destroy_workqueue(wil->wmi_wq);
 136                 return -EAGAIN;
 137         }
 138
 139         /* make shadow copy of registers that should not change on run time */
 140         wil_memcpy_fromio_32(&wil->mbox_ctl, wil->csr + HOST_MBOX,
 141                              sizeof(struct wil6210_mbox_ctl));
 142         wil_mbox_ring_le2cpus(&wil->mbox_ctl.rx);
 143         wil_mbox_ring_le2cpus(&wil->mbox_ctl.tx);
 144
 145         return 0;
 146 }
 147
 148 void wil6210_disconnect(struct wil6210_priv *wil, void *bssid)
 149 {
 150         del_timer_sync(&wil->connect_timer);
 151         _wil6210_disconnect(wil, bssid);
 152 }
 153
 154 void wil_priv_deinit(struct wil6210_priv *wil)
 155 {
 156         cancel_work_sync(&wil->disconnect_worker);
 157         wil6210_disconnect(wil, NULL);
 158         wmi_event_flush(wil);
 159         destroy_workqueue(wil->wmi_wq_conn);
 160         destroy_workqueue(wil->wmi_wq);
 161 }
 162
 163 static void wil_target_reset(struct wil6210_priv *wil)
 164 {
 165         wil_dbg(wil, "Resetting...\n");
 166
 167         /* register write */
 168 #define W(a, v) iowrite32(v, wil->csr + HOSTADDR(a))
 169         /* register set = read, OR, write */
 170 #define S(a, v) iowrite32(ioread32(wil->csr + HOSTADDR(a)) | v, \
 171                 wil->csr + HOSTADDR(a))
 172
 173         /* hpal_perst_from_pad_src_n_mask */
 174         S(RGF_USER_CLKS_CTL_SW_RST_MASK_0, BIT(6));
 175         /* car_perst_rst_src_n_mask */
 176         S(RGF_USER_CLKS_CTL_SW_RST_MASK_0, BIT(7));
 177
 178         W(RGF_USER_MAC_CPU_0,  BIT(1)); /* mac_cpu_man_rst */
 179         W(RGF_USER_USER_CPU_0, BIT(1)); /* user_cpu_man_rst */
 180
 181         msleep(100);
 182
 183         W(RGF_USER_CLKS_CTL_SW_RST_VEC_2, 0xFE000000);
 184         W(RGF_USER_CLKS_CTL_SW_RST_VEC_1, 0x0000003F);
 185         W(RGF_USER_CLKS_CTL_SW_RST_VEC_3, 0x00000170);
 186         W(RGF_USER_CLKS_CTL_SW_RST_VEC_0, 0xFFE7FC00);
 187
 188         msleep(100);
 189
 190         W(RGF_USER_CLKS_CTL_SW_RST_VEC_3, 0);
 191         W(RGF_USER_CLKS_CTL_SW_RST_VEC_2, 0);
 192         W(RGF_USER_CLKS_CTL_SW_RST_VEC_1, 0);
 193         W(RGF_USER_CLKS_CTL_SW_RST_VEC_0, 0);
 194
 195         W(RGF_USER_CLKS_CTL_SW_RST_VEC_3, 0x00000001);
 196         W(RGF_USER_CLKS_CTL_SW_RST_VEC_2, 0x00000080);
 197         W(RGF_USER_CLKS_CTL_SW_RST_VEC_0, 0);
 198
 199         msleep(2000);
 200
 201         W(RGF_USER_USER_CPU_0, BIT(0)); /* user_cpu_man_de_rst */
 202
 203         msleep(2000);
 204
 205         wil_dbg(wil, "Reset completed\n");
 206
 207 #undef W
 208 #undef S
 209 }
 210
 211 void wil_mbox_ring_le2cpus(struct wil6210_mbox_ring *r)
 212 {
 213         le32_to_cpus(&r->base);
 214         le16_to_cpus(&r->entry_size);
 215         le16_to_cpus(&r->size);
 216         le32_to_cpus(&r->tail);
 217         le32_to_cpus(&r->head);
 218 }
 219
 220 static int wil_wait_for_fw_ready(struct wil6210_priv *wil)
 221 {
 222         ulong to = msecs_to_jiffies(1000);
 223         ulong left = wait_for_completion_timeout(&wil->wmi_ready, to);
 224         if (0 == left) {
 225                 wil_err(wil, "Firmware not ready\n");
 226                 return -ETIME;
 227         } else {
 228                 wil_dbg(wil, "FW ready after %d ms\n",
 229                         jiffies_to_msecs(to-left));
 230         }
 231         return 0;
 232 }
 233
 234 /*
 235  * We reset all the structures, and we reset the UMAC.
 236  * After calling this routine, you're expected to reload
 237  * the firmware.
 238  */
 239 int wil_reset(struct wil6210_priv *wil)
 240 {
 241         int rc;
 242
 243         cancel_work_sync(&wil->disconnect_worker);
 244         wil6210_disconnect(wil, NULL);
 245
 246         wmi_event_flush(wil);
 247
 248         flush_workqueue(wil->wmi_wq);
 249         flush_workqueue(wil->wmi_wq_conn);
 250
 251         wil6210_disable_irq(wil);
 252         wil->status = 0;
 253
 254         /* TODO: put MAC in reset */
 255         wil_target_reset(wil);
 256
 257         /* init after reset */
 258         wil->pending_connect_cid = -1;
 259         INIT_COMPLETION(wil->wmi_ready);
 260
 261         /* make shadow copy of registers that should not change on run time */
 262         wil_memcpy_fromio_32(&wil->mbox_ctl, wil->csr + HOST_MBOX,
 263                              sizeof(struct wil6210_mbox_ctl));
 264         wil_mbox_ring_le2cpus(&wil->mbox_ctl.rx);
 265         wil_mbox_ring_le2cpus(&wil->mbox_ctl.tx);
 266
 267         /* TODO: release MAC reset */
 268         wil6210_enable_irq(wil);
 269
 270         /* we just started MAC, wait for FW ready */
 271         rc = wil_wait_for_fw_ready(wil);
 272
 273         return rc;
 274 }
 275
 276
 277 void wil_link_on(struct wil6210_priv *wil)
 278 {
 279         struct net_device *ndev = wil_to_ndev(wil);
 280
 281         wil_dbg(wil, "%s()\n", __func__);
 282
 283         netif_carrier_on(ndev);
 284         netif_tx_wake_all_queues(ndev);
 285 }
 286
 287 void wil_link_off(struct wil6210_priv *wil)
 288 {
 289         struct net_device *ndev = wil_to_ndev(wil);
 290
 291         wil_dbg(wil, "%s()\n", __func__);
 292
 293         netif_tx_stop_all_queues(ndev);
 294         netif_carrier_off(ndev);
 295 }
 296
 297 static int __wil_up(struct wil6210_priv *wil)
 298 {
 299         struct net_device *ndev = wil_to_ndev(wil);
 300         struct wireless_dev *wdev = wil->wdev;
 301         struct ieee80211_channel *channel = wdev->preset_chandef.chan;
 302         int rc;
 303         int bi;
 304         u16 wmi_nettype = wil_iftype_nl2wmi(wdev->iftype);
 305
 306         rc = wil_reset(wil);
 307         if (rc)
 308                 return rc;
 309
 310         /* FIXME Firmware works now in PBSS mode(ToDS=0, FromDS=0) */
 311         wmi_nettype = wil_iftype_nl2wmi(NL80211_IFTYPE_ADHOC);
 312         switch (wdev->iftype) {
 313         case NL80211_IFTYPE_STATION:
 314                 wil_dbg(wil, "type: STATION\n");
 315                 bi = 0;
 316                 ndev->type = ARPHRD_ETHER;
 317                 break;
 318         case NL80211_IFTYPE_AP:
 319                 wil_dbg(wil, "type: AP\n");
 320                 bi = 100;
 321                 ndev->type = ARPHRD_ETHER;
 322                 break;
 323         case NL80211_IFTYPE_P2P_CLIENT:
 324                 wil_dbg(wil, "type: P2P_CLIENT\n");
 325                 bi = 0;
 326                 ndev->type = ARPHRD_ETHER;
 327                 break;
 328         case NL80211_IFTYPE_P2P_GO:
 329                 wil_dbg(wil, "type: P2P_GO\n");
 330                 bi = 100;
 331                 ndev->type = ARPHRD_ETHER;
 332                 break;
 333         case NL80211_IFTYPE_MONITOR:
 334                 wil_dbg(wil, "type: Monitor\n");
 335                 bi = 0;
 336                 ndev->type = ARPHRD_IEEE80211_RADIOTAP;
 337                 /* ARPHRD_IEEE80211 or ARPHRD_IEEE80211_RADIOTAP ? */
 338                 break;
 339         default:
 340                 return -EOPNOTSUPP;
 341         }
 342
 343         /* Apply profile in the following order: */
 344         /* SSID and channel for the AP */
 345         switch (wdev->iftype) {
 346         case NL80211_IFTYPE_AP:
 347         case NL80211_IFTYPE_P2P_GO:
 348                 if (wdev->ssid_len == 0) {
 349                         wil_err(wil, "SSID not set\n");
 350                         return -EINVAL;
 351                 }
 352                 wmi_set_ssid(wil, wdev->ssid_len, wdev->ssid);
 353                 if (channel)
 354                         wmi_set_channel(wil, channel->hw_value);
 355                 break;
 356         default:
 357                 ;
 358         }
 359
 360         /* MAC address - pre-requisite for other commands */
 361         wmi_set_mac_address(wil, ndev->dev_addr);
 362
 363         /* Set up beaconing if required. */
 364         rc = wmi_set_bcon(wil, bi, wmi_nettype);
 365         if (rc)
 366                 return rc;
 367
 368         /* Rx VRING. After MAC and beacon */
 369         wil_rx_init(wil);
 370
 371         return 0;
 372 }
 373
 374 int wil_up(struct wil6210_priv *wil)
 375 {
 376         int rc;
 377
 378         mutex_lock(&wil->mutex);
 379         rc = __wil_up(wil);
 380         mutex_unlock(&wil->mutex);
 381
 382         return rc;
 383 }
 384
 385 static int __wil_down(struct wil6210_priv *wil)
 386 {
 387         if (wil->scan_request) {
 388                 cfg80211_scan_done(wil->scan_request, true);
 389                 wil->scan_request = NULL;
 390         }
 391
 392         wil6210_disconnect(wil, NULL);
 393         wil_rx_fini(wil);
 394
 395         return 0;
 396 }
 397
 398 int wil_down(struct wil6210_priv *wil)
 399 {
 400         int rc;
 401
 402         mutex_lock(&wil->mutex);
 403         rc = __wil_down(wil);
 404         mutex_unlock(&wil->mutex);
 405
 406         return rc;
 407 }