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 static void wil_connect_worker(struct work_struct *work)
 122 {
 123         int rc;
 124         struct wil6210_priv *wil = container_of(work, struct wil6210_priv,
 125                                                 connect_worker);
 126         int cid = wil->pending_connect_cid;
 127
 128         if (cid < 0) {
 129                 wil_err(wil, "No connection pending\n");
 130                 return;
 131         }
 132
 133         wil_dbg_wmi(wil, "Configure for connection CID %d\n", cid);
 134
 135         rc = wil_vring_init_tx(wil, 0, WIL6210_TX_RING_SIZE, cid, 0);
 136         wil->pending_connect_cid = -1;
 137         if (rc == 0)
 138                 wil_link_on(wil);
 139 }
 140
 141 int wil_priv_init(struct wil6210_priv *wil)
 142 {
 143         wil_dbg_misc(wil, "%s()\n", __func__);
 144
 145         mutex_init(&wil->mutex);
 146         mutex_init(&wil->wmi_mutex);
 147
 148         init_completion(&wil->wmi_ready);
 149
 150         wil->pending_connect_cid = -1;
 151         setup_timer(&wil->connect_timer, wil_connect_timer_fn, (ulong)wil);
 152
 153         INIT_WORK(&wil->connect_worker, wil_connect_worker);
 154         INIT_WORK(&wil->disconnect_worker, wil_disconnect_worker);
 155         INIT_WORK(&wil->wmi_event_worker, wmi_event_worker);
 156
 157         INIT_LIST_HEAD(&wil->pending_wmi_ev);
 158         spin_lock_init(&wil->wmi_ev_lock);
 159
 160         wil->wmi_wq = create_singlethread_workqueue(WIL_NAME"_wmi");
 161         if (!wil->wmi_wq)
 162                 return -EAGAIN;
 163
 164         wil->wmi_wq_conn = create_singlethread_workqueue(WIL_NAME"_connect");
 165         if (!wil->wmi_wq_conn) {
 166                 destroy_workqueue(wil->wmi_wq);
 167                 return -EAGAIN;
 168         }
 169
 170         wil_cache_mbox_regs(wil);
 171
 172         return 0;
 173 }
 174
 175 void wil6210_disconnect(struct wil6210_priv *wil, void *bssid)
 176 {
 177         del_timer_sync(&wil->connect_timer);
 178         _wil6210_disconnect(wil, bssid);
 179 }
 180
 181 void wil_priv_deinit(struct wil6210_priv *wil)
 182 {
 183         cancel_work_sync(&wil->disconnect_worker);
 184         wil6210_disconnect(wil, NULL);
 185         wmi_event_flush(wil);
 186         destroy_workqueue(wil->wmi_wq_conn);
 187         destroy_workqueue(wil->wmi_wq);
 188 }
 189
 190 static void wil_target_reset(struct wil6210_priv *wil)
 191 {
 192         wil_dbg_misc(wil, "Resetting...\n");
 193
 194         /* register write */
 195 #define W(a, v) iowrite32(v, wil->csr + HOSTADDR(a))
 196         /* register set = read, OR, write */
 197 #define S(a, v) iowrite32(ioread32(wil->csr + HOSTADDR(a)) | v, \
 198                 wil->csr + HOSTADDR(a))
 199
 200         /* hpal_perst_from_pad_src_n_mask */
 201         S(RGF_USER_CLKS_CTL_SW_RST_MASK_0, BIT(6));
 202         /* car_perst_rst_src_n_mask */
 203         S(RGF_USER_CLKS_CTL_SW_RST_MASK_0, BIT(7));
 204
 205         W(RGF_USER_MAC_CPU_0,  BIT(1)); /* mac_cpu_man_rst */
 206         W(RGF_USER_USER_CPU_0, BIT(1)); /* user_cpu_man_rst */
 207
 208         msleep(100);
 209
 210         W(RGF_USER_CLKS_CTL_SW_RST_VEC_2, 0xFE000000);
 211         W(RGF_USER_CLKS_CTL_SW_RST_VEC_1, 0x0000003F);
 212         W(RGF_USER_CLKS_CTL_SW_RST_VEC_3, 0x00000170);
 213         W(RGF_USER_CLKS_CTL_SW_RST_VEC_0, 0xFFE7FC00);
 214
 215         msleep(100);
 216
 217         W(RGF_USER_CLKS_CTL_SW_RST_VEC_3, 0);
 218         W(RGF_USER_CLKS_CTL_SW_RST_VEC_2, 0);
 219         W(RGF_USER_CLKS_CTL_SW_RST_VEC_1, 0);
 220         W(RGF_USER_CLKS_CTL_SW_RST_VEC_0, 0);
 221
 222         W(RGF_USER_CLKS_CTL_SW_RST_VEC_3, 0x00000001);
 223         W(RGF_USER_CLKS_CTL_SW_RST_VEC_2, 0x00000080);
 224         W(RGF_USER_CLKS_CTL_SW_RST_VEC_0, 0);
 225
 226         msleep(2000);
 227
 228         W(RGF_USER_USER_CPU_0, BIT(0)); /* user_cpu_man_de_rst */
 229
 230         msleep(2000);
 231
 232         wil_dbg_misc(wil, "Reset completed\n");
 233
 234 #undef W
 235 #undef S
 236 }
 237
 238 void wil_mbox_ring_le2cpus(struct wil6210_mbox_ring *r)
 239 {
 240         le32_to_cpus(&r->base);
 241         le16_to_cpus(&r->entry_size);
 242         le16_to_cpus(&r->size);
 243         le32_to_cpus(&r->tail);
 244         le32_to_cpus(&r->head);
 245 }
 246
 247 static int wil_wait_for_fw_ready(struct wil6210_priv *wil)
 248 {
 249         ulong to = msecs_to_jiffies(1000);
 250         ulong left = wait_for_completion_timeout(&wil->wmi_ready, to);
 251         if (0 == left) {
 252                 wil_err(wil, "Firmware not ready\n");
 253                 return -ETIME;
 254         } else {
 255                 wil_dbg_misc(wil, "FW ready after %d ms\n",
 256                              jiffies_to_msecs(to-left));
 257         }
 258         return 0;
 259 }
 260
 261 /*
 262  * We reset all the structures, and we reset the UMAC.
 263  * After calling this routine, you're expected to reload
 264  * the firmware.
 265  */
 266 int wil_reset(struct wil6210_priv *wil)
 267 {
 268         int rc;
 269
 270         cancel_work_sync(&wil->disconnect_worker);
 271         wil6210_disconnect(wil, NULL);
 272
 273         wil6210_disable_irq(wil);
 274         wil->status = 0;
 275
 276         wmi_event_flush(wil);
 277
 278         flush_workqueue(wil->wmi_wq_conn);
 279         flush_workqueue(wil->wmi_wq);
 280
 281         /* TODO: put MAC in reset */
 282         wil_target_reset(wil);
 283
 284         /* init after reset */
 285         wil->pending_connect_cid = -1;
 286         INIT_COMPLETION(wil->wmi_ready);
 287
 288         wil_cache_mbox_regs(wil);
 289
 290         /* TODO: release MAC reset */
 291         wil6210_enable_irq(wil);
 292
 293         /* we just started MAC, wait for FW ready */
 294         rc = wil_wait_for_fw_ready(wil);
 295
 296         return rc;
 297 }
 298
 299
 300 void wil_link_on(struct wil6210_priv *wil)
 301 {
 302         struct net_device *ndev = wil_to_ndev(wil);
 303
 304         wil_dbg_misc(wil, "%s()\n", __func__);
 305
 306         netif_carrier_on(ndev);
 307         netif_tx_wake_all_queues(ndev);
 308 }
 309
 310 void wil_link_off(struct wil6210_priv *wil)
 311 {
 312         struct net_device *ndev = wil_to_ndev(wil);
 313
 314         wil_dbg_misc(wil, "%s()\n", __func__);
 315
 316         netif_tx_stop_all_queues(ndev);
 317         netif_carrier_off(ndev);
 318 }
 319
 320 static int __wil_up(struct wil6210_priv *wil)
 321 {
 322         struct net_device *ndev = wil_to_ndev(wil);
 323         struct wireless_dev *wdev = wil->wdev;
 324         struct ieee80211_channel *channel = wdev->preset_chandef.chan;
 325         int rc;
 326         int bi;
 327         u16 wmi_nettype = wil_iftype_nl2wmi(wdev->iftype);
 328
 329         rc = wil_reset(wil);
 330         if (rc)
 331                 return rc;
 332
 333         /* FIXME Firmware works now in PBSS mode(ToDS=0, FromDS=0) */
 334         wmi_nettype = wil_iftype_nl2wmi(NL80211_IFTYPE_ADHOC);
 335         switch (wdev->iftype) {
 336         case NL80211_IFTYPE_STATION:
 337                 wil_dbg_misc(wil, "type: STATION\n");
 338                 bi = 0;
 339                 ndev->type = ARPHRD_ETHER;
 340                 break;
 341         case NL80211_IFTYPE_AP:
 342                 wil_dbg_misc(wil, "type: AP\n");
 343                 bi = 100;
 344                 ndev->type = ARPHRD_ETHER;
 345                 break;
 346         case NL80211_IFTYPE_P2P_CLIENT:
 347                 wil_dbg_misc(wil, "type: P2P_CLIENT\n");
 348                 bi = 0;
 349                 ndev->type = ARPHRD_ETHER;
 350                 break;
 351         case NL80211_IFTYPE_P2P_GO:
 352                 wil_dbg_misc(wil, "type: P2P_GO\n");
 353                 bi = 100;
 354                 ndev->type = ARPHRD_ETHER;
 355                 break;
 356         case NL80211_IFTYPE_MONITOR:
 357                 wil_dbg_misc(wil, "type: Monitor\n");
 358                 bi = 0;
 359                 ndev->type = ARPHRD_IEEE80211_RADIOTAP;
 360                 /* ARPHRD_IEEE80211 or ARPHRD_IEEE80211_RADIOTAP ? */
 361                 break;
 362         default:
 363                 return -EOPNOTSUPP;
 364         }
 365
 366         /* Apply profile in the following order: */
 367         /* SSID and channel for the AP */
 368         switch (wdev->iftype) {
 369         case NL80211_IFTYPE_AP:
 370         case NL80211_IFTYPE_P2P_GO:
 371                 if (wdev->ssid_len == 0) {
 372                         wil_err(wil, "SSID not set\n");
 373                         return -EINVAL;
 374                 }
 375                 wmi_set_ssid(wil, wdev->ssid_len, wdev->ssid);
 376                 if (channel)
 377                         wmi_set_channel(wil, channel->hw_value);
 378                 break;
 379         default:
 380                 break;
 381         }
 382
 383         /* MAC address - pre-requisite for other commands */
 384         wmi_set_mac_address(wil, ndev->dev_addr);
 385
 386         /* Set up beaconing if required. */
 387         rc = wmi_set_bcon(wil, bi, wmi_nettype);
 388         if (rc)
 389                 return rc;
 390
 391         /* Rx VRING. After MAC and beacon */
 392         wil_rx_init(wil);
 393
 394         return 0;
 395 }
 396
 397 int wil_up(struct wil6210_priv *wil)
 398 {
 399         int rc;
 400
 401         mutex_lock(&wil->mutex);
 402         rc = __wil_up(wil);
 403         mutex_unlock(&wil->mutex);
 404
 405         return rc;
 406 }
 407
 408 static int __wil_down(struct wil6210_priv *wil)
 409 {
 410         if (wil->scan_request) {
 411                 cfg80211_scan_done(wil->scan_request, true);
 412                 wil->scan_request = NULL;
 413         }
 414
 415         wil6210_disconnect(wil, NULL);
 416         wil_rx_fini(wil);
 417
 418         return 0;
 419 }
 420
 421 int wil_down(struct wil6210_priv *wil)
 422 {
 423         int rc;
 424
 425         mutex_lock(&wil->mutex);
 426         rc = __wil_down(wil);
 427         mutex_unlock(&wil->mutex);
 428
 429         return rc;
 430 }