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/moduleparam.h>
  18 #include <linux/if_arp.h>
  19
  20 #include "wil6210.h"
  21
  22 /*
  23  * Due to a hardware issue,
  24  * one has to read/write to/from NIC in 32-bit chunks;
  25  * regular memcpy_fromio and siblings will
  26  * not work on 64-bit platform - it uses 64-bit transactions
  27  *
  28  * Force 32-bit transactions to enable NIC on 64-bit platforms
  29  *
  30  * To avoid byte swap on big endian host, __raw_{read|write}l
  31  * should be used - {read|write}l would swap bytes to provide
  32  * little endian on PCI value in host endianness.
  33  */
  34 void wil_memcpy_fromio_32(void *dst, const volatile void __iomem *src,
  35                           size_t count)
  36 {
  37         u32 *d = dst;
  38         const volatile u32 __iomem *s = src;
  39
  40         /* size_t is unsigned, if (count%4 != 0) it will wrap */
  41         for (count += 4; count > 4; count -= 4)
  42                 *d++ = __raw_readl(s++);
  43 }
  44
  45 void wil_memcpy_toio_32(volatile void __iomem *dst, const void *src,
  46                         size_t count)
  47 {
  48         volatile u32 __iomem *d = dst;
  49         const u32 *s = src;
  50
  51         for (count += 4; count > 4; count -= 4)
  52                 __raw_writel(*s++, d++);
  53 }
  54
  55 static void _wil6210_disconnect(struct wil6210_priv *wil, void *bssid)
  56 {
  57         uint i;
  58         struct net_device *ndev = wil_to_ndev(wil);
  59         struct wireless_dev *wdev = wil->wdev;
  60
  61         wil_dbg_misc(wil, "%s()\n", __func__);
  62
  63         wil_link_off(wil);
  64         clear_bit(wil_status_fwconnected, &wil->status);
  65
  66         switch (wdev->sme_state) {
  67         case CFG80211_SME_CONNECTED:
  68                 cfg80211_disconnected(ndev, WLAN_STATUS_UNSPECIFIED_FAILURE,
  69                                       NULL, 0, GFP_KERNEL);
  70                 break;
  71         case CFG80211_SME_CONNECTING:
  72                 cfg80211_connect_result(ndev, bssid, NULL, 0, NULL, 0,
  73                                         WLAN_STATUS_UNSPECIFIED_FAILURE,
  74                                         GFP_KERNEL);
  75                 break;
  76         default:
  77                 break;
  78         }
  79
  80         for (i = 0; i < ARRAY_SIZE(wil->vring_tx); i++)
  81                 wil_vring_fini_tx(wil, i);
  82
  83         clear_bit(wil_status_dontscan, &wil->status);
  84 }
  85
  86 static void wil_disconnect_worker(struct work_struct *work)
  87 {
  88         struct wil6210_priv *wil = container_of(work,
  89                         struct wil6210_priv, disconnect_worker);
  90
  91         _wil6210_disconnect(wil, NULL);
  92 }
  93
  94 static void wil_connect_timer_fn(ulong x)
  95 {
  96         struct wil6210_priv *wil = (void *)x;
  97
  98         wil_dbg_misc(wil, "Connect timeout\n");
  99
 100         /* reschedule to thread context - disconnect won't
 101          * run from atomic context
 102          */
 103         schedule_work(&wil->disconnect_worker);
 104 }
 105
 106 static void wil_connect_worker(struct work_struct *work)
 107 {
 108         int rc;
 109         struct wil6210_priv *wil = container_of(work, struct wil6210_priv,
 110                                                 connect_worker);
 111         int cid = wil->pending_connect_cid;
 112
 113         if (cid < 0) {
 114                 wil_err(wil, "No connection pending\n");
 115                 return;
 116         }
 117
 118         wil_dbg_wmi(wil, "Configure for connection CID %d\n", cid);
 119
 120         rc = wil_vring_init_tx(wil, 0, WIL6210_TX_RING_SIZE, cid, 0);
 121         wil->pending_connect_cid = -1;
 122         if (rc == 0)
 123                 wil_link_on(wil);
 124 }
 125
 126 int wil_priv_init(struct wil6210_priv *wil)
 127 {
 128         wil_dbg_misc(wil, "%s()\n", __func__);
 129
 130         mutex_init(&wil->mutex);
 131         mutex_init(&wil->wmi_mutex);
 132
 133         init_completion(&wil->wmi_ready);
 134
 135         wil->pending_connect_cid = -1;
 136         setup_timer(&wil->connect_timer, wil_connect_timer_fn, (ulong)wil);
 137
 138         INIT_WORK(&wil->connect_worker, wil_connect_worker);
 139         INIT_WORK(&wil->disconnect_worker, wil_disconnect_worker);
 140         INIT_WORK(&wil->wmi_event_worker, wmi_event_worker);
 141
 142         INIT_LIST_HEAD(&wil->pending_wmi_ev);
 143         spin_lock_init(&wil->wmi_ev_lock);
 144
 145         wil->wmi_wq = create_singlethread_workqueue(WIL_NAME"_wmi");
 146         if (!wil->wmi_wq)
 147                 return -EAGAIN;
 148
 149         wil->wmi_wq_conn = create_singlethread_workqueue(WIL_NAME"_connect");
 150         if (!wil->wmi_wq_conn) {
 151                 destroy_workqueue(wil->wmi_wq);
 152                 return -EAGAIN;
 153         }
 154
 155         return 0;
 156 }
 157
 158 void wil6210_disconnect(struct wil6210_priv *wil, void *bssid)
 159 {
 160         del_timer_sync(&wil->connect_timer);
 161         _wil6210_disconnect(wil, bssid);
 162 }
 163
 164 void wil_priv_deinit(struct wil6210_priv *wil)
 165 {
 166         cancel_work_sync(&wil->disconnect_worker);
 167         wil6210_disconnect(wil, NULL);
 168         wmi_event_flush(wil);
 169         destroy_workqueue(wil->wmi_wq_conn);
 170         destroy_workqueue(wil->wmi_wq);
 171 }
 172
 173 static void wil_target_reset(struct wil6210_priv *wil)
 174 {
 175         wil_dbg_misc(wil, "Resetting...\n");
 176
 177         /* register write */
 178 #define W(a, v) iowrite32(v, wil->csr + HOSTADDR(a))
 179         /* register set = read, OR, write */
 180 #define S(a, v) iowrite32(ioread32(wil->csr + HOSTADDR(a)) | v, \
 181                 wil->csr + HOSTADDR(a))
 182
 183         /* hpal_perst_from_pad_src_n_mask */
 184         S(RGF_USER_CLKS_CTL_SW_RST_MASK_0, BIT(6));
 185         /* car_perst_rst_src_n_mask */
 186         S(RGF_USER_CLKS_CTL_SW_RST_MASK_0, BIT(7));
 187
 188         W(RGF_USER_MAC_CPU_0,  BIT(1)); /* mac_cpu_man_rst */
 189         W(RGF_USER_USER_CPU_0, BIT(1)); /* user_cpu_man_rst */
 190
 191         W(RGF_USER_CLKS_CTL_SW_RST_VEC_2, 0xFE000000);
 192         W(RGF_USER_CLKS_CTL_SW_RST_VEC_1, 0x0000003F);
 193         W(RGF_USER_CLKS_CTL_SW_RST_VEC_3, 0x00000170);
 194         W(RGF_USER_CLKS_CTL_SW_RST_VEC_0, 0xFFE7FC00);
 195
 196         W(RGF_USER_CLKS_CTL_SW_RST_VEC_3, 0);
 197         W(RGF_USER_CLKS_CTL_SW_RST_VEC_2, 0);
 198         W(RGF_USER_CLKS_CTL_SW_RST_VEC_1, 0);
 199         W(RGF_USER_CLKS_CTL_SW_RST_VEC_0, 0);
 200
 201         W(RGF_USER_CLKS_CTL_SW_RST_VEC_3, 0x00000001);
 202         W(RGF_USER_CLKS_CTL_SW_RST_VEC_2, 0x00000080);
 203         W(RGF_USER_CLKS_CTL_SW_RST_VEC_0, 0);
 204
 205         wil_dbg_misc(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_misc(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         wil6210_disable_irq(wil);
 247         wil->status = 0;
 248
 249         wmi_event_flush(wil);
 250
 251         flush_workqueue(wil->wmi_wq_conn);
 252         flush_workqueue(wil->wmi_wq);
 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         /* TODO: release MAC reset */
 262         wil6210_enable_irq(wil);
 263
 264         /* we just started MAC, wait for FW ready */
 265         rc = wil_wait_for_fw_ready(wil);
 266
 267         return rc;
 268 }
 269
 270
 271 void wil_link_on(struct wil6210_priv *wil)
 272 {
 273         struct net_device *ndev = wil_to_ndev(wil);
 274
 275         wil_dbg_misc(wil, "%s()\n", __func__);
 276
 277         netif_carrier_on(ndev);
 278         netif_tx_wake_all_queues(ndev);
 279 }
 280
 281 void wil_link_off(struct wil6210_priv *wil)
 282 {
 283         struct net_device *ndev = wil_to_ndev(wil);
 284
 285         wil_dbg_misc(wil, "%s()\n", __func__);
 286
 287         netif_tx_stop_all_queues(ndev);
 288         netif_carrier_off(ndev);
 289 }
 290
 291 static int __wil_up(struct wil6210_priv *wil)
 292 {
 293         struct net_device *ndev = wil_to_ndev(wil);
 294         struct wireless_dev *wdev = wil->wdev;
 295         struct ieee80211_channel *channel = wdev->preset_chandef.chan;
 296         int rc;
 297         int bi;
 298         u16 wmi_nettype = wil_iftype_nl2wmi(wdev->iftype);
 299
 300         rc = wil_reset(wil);
 301         if (rc)
 302                 return rc;
 303
 304         /* FIXME Firmware works now in PBSS mode(ToDS=0, FromDS=0) */
 305         wmi_nettype = wil_iftype_nl2wmi(NL80211_IFTYPE_ADHOC);
 306         switch (wdev->iftype) {
 307         case NL80211_IFTYPE_STATION:
 308                 wil_dbg_misc(wil, "type: STATION\n");
 309                 bi = 0;
 310                 ndev->type = ARPHRD_ETHER;
 311                 break;
 312         case NL80211_IFTYPE_AP:
 313                 wil_dbg_misc(wil, "type: AP\n");
 314                 bi = 100;
 315                 ndev->type = ARPHRD_ETHER;
 316                 break;
 317         case NL80211_IFTYPE_P2P_CLIENT:
 318                 wil_dbg_misc(wil, "type: P2P_CLIENT\n");
 319                 bi = 0;
 320                 ndev->type = ARPHRD_ETHER;
 321                 break;
 322         case NL80211_IFTYPE_P2P_GO:
 323                 wil_dbg_misc(wil, "type: P2P_GO\n");
 324                 bi = 100;
 325                 ndev->type = ARPHRD_ETHER;
 326                 break;
 327         case NL80211_IFTYPE_MONITOR:
 328                 wil_dbg_misc(wil, "type: Monitor\n");
 329                 bi = 0;
 330                 ndev->type = ARPHRD_IEEE80211_RADIOTAP;
 331                 /* ARPHRD_IEEE80211 or ARPHRD_IEEE80211_RADIOTAP ? */
 332                 break;
 333         default:
 334                 return -EOPNOTSUPP;
 335         }
 336
 337         /* Apply profile in the following order: */
 338         /* SSID and channel for the AP */
 339         switch (wdev->iftype) {
 340         case NL80211_IFTYPE_AP:
 341         case NL80211_IFTYPE_P2P_GO:
 342                 if (wdev->ssid_len == 0) {
 343                         wil_err(wil, "SSID not set\n");
 344                         return -EINVAL;
 345                 }
 346                 rc = wmi_set_ssid(wil, wdev->ssid_len, wdev->ssid);
 347                 if (rc)
 348                         return rc;
 349                 break;
 350         default:
 351                 break;
 352         }
 353
 354         /* MAC address - pre-requisite for other commands */
 355         wmi_set_mac_address(wil, ndev->dev_addr);
 356
 357         /* Set up beaconing if required. */
 358         if (bi > 0) {
 359                 rc = wmi_pcp_start(wil, bi, wmi_nettype,
 360                                    (channel ? channel->hw_value : 0));
 361                 if (rc)
 362                         return rc;
 363         }
 364
 365         /* Rx VRING. After MAC and beacon */
 366         wil_rx_init(wil);
 367
 368         return 0;
 369 }
 370
 371 int wil_up(struct wil6210_priv *wil)
 372 {
 373         int rc;
 374
 375         mutex_lock(&wil->mutex);
 376         rc = __wil_up(wil);
 377         mutex_unlock(&wil->mutex);
 378
 379         return rc;
 380 }
 381
 382 static int __wil_down(struct wil6210_priv *wil)
 383 {
 384         if (wil->scan_request) {
 385                 cfg80211_scan_done(wil->scan_request, true);
 386                 wil->scan_request = NULL;
 387         }
 388
 389         wil6210_disconnect(wil, NULL);
 390         wil_rx_fini(wil);
 391
 392         return 0;
 393 }
 394
 395 int wil_down(struct wil6210_priv *wil)
 396 {
 397         int rc;
 398
 399         mutex_lock(&wil->mutex);
 400         rc = __wil_down(wil);
 401         mutex_unlock(&wil->mutex);
 402
 403         return rc;
 404 }