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
  60         wil_dbg_misc(wil, "%s()\n", __func__);
  61
  62         wil_link_off(wil);
  63         if (test_bit(wil_status_fwconnected, &wil->status)) {
  64                 clear_bit(wil_status_fwconnected, &wil->status);
  65                 cfg80211_disconnected(ndev,
  66                                       WLAN_STATUS_UNSPECIFIED_FAILURE,
  67                                       NULL, 0, GFP_KERNEL);
  68         } else if (test_bit(wil_status_fwconnecting, &wil->status)) {
  69                 cfg80211_connect_result(ndev, bssid, NULL, 0, NULL, 0,
  70                                         WLAN_STATUS_UNSPECIFIED_FAILURE,
  71                                         GFP_KERNEL);
  72         }
  73         clear_bit(wil_status_fwconnecting, &wil->status);
  74         for (i = 0; i < ARRAY_SIZE(wil->vring_tx); i++)
  75                 wil_vring_fini_tx(wil, i);
  76
  77         clear_bit(wil_status_dontscan, &wil->status);
  78 }
  79
  80 static void wil_disconnect_worker(struct work_struct *work)
  81 {
  82         struct wil6210_priv *wil = container_of(work,
  83                         struct wil6210_priv, disconnect_worker);
  84
  85         _wil6210_disconnect(wil, NULL);
  86 }
  87
  88 static void wil_connect_timer_fn(ulong x)
  89 {
  90         struct wil6210_priv *wil = (void *)x;
  91
  92         wil_dbg_misc(wil, "Connect timeout\n");
  93
  94         /* reschedule to thread context - disconnect won't
  95          * run from atomic context
  96          */
  97         schedule_work(&wil->disconnect_worker);
  98 }
  99
 100 static void wil_connect_worker(struct work_struct *work)
 101 {
 102         int rc;
 103         struct wil6210_priv *wil = container_of(work, struct wil6210_priv,
 104                                                 connect_worker);
 105         int cid = wil->pending_connect_cid;
 106
 107         if (cid < 0) {
 108                 wil_err(wil, "No connection pending\n");
 109                 return;
 110         }
 111
 112         wil_dbg_wmi(wil, "Configure for connection CID %d\n", cid);
 113
 114         rc = wil_vring_init_tx(wil, 0, WIL6210_TX_RING_SIZE, cid, 0);
 115         wil->pending_connect_cid = -1;
 116         if (rc == 0)
 117                 wil_link_on(wil);
 118 }
 119
 120 int wil_priv_init(struct wil6210_priv *wil)
 121 {
 122         wil_dbg_misc(wil, "%s()\n", __func__);
 123
 124         mutex_init(&wil->mutex);
 125         mutex_init(&wil->wmi_mutex);
 126
 127         init_completion(&wil->wmi_ready);
 128
 129         wil->pending_connect_cid = -1;
 130         setup_timer(&wil->connect_timer, wil_connect_timer_fn, (ulong)wil);
 131
 132         INIT_WORK(&wil->connect_worker, wil_connect_worker);
 133         INIT_WORK(&wil->disconnect_worker, wil_disconnect_worker);
 134         INIT_WORK(&wil->wmi_event_worker, wmi_event_worker);
 135
 136         INIT_LIST_HEAD(&wil->pending_wmi_ev);
 137         spin_lock_init(&wil->wmi_ev_lock);
 138
 139         wil->wmi_wq = create_singlethread_workqueue(WIL_NAME"_wmi");
 140         if (!wil->wmi_wq)
 141                 return -EAGAIN;
 142
 143         wil->wmi_wq_conn = create_singlethread_workqueue(WIL_NAME"_connect");
 144         if (!wil->wmi_wq_conn) {
 145                 destroy_workqueue(wil->wmi_wq);
 146                 return -EAGAIN;
 147         }
 148
 149         return 0;
 150 }
 151
 152 void wil6210_disconnect(struct wil6210_priv *wil, void *bssid)
 153 {
 154         del_timer_sync(&wil->connect_timer);
 155         _wil6210_disconnect(wil, bssid);
 156 }
 157
 158 void wil_priv_deinit(struct wil6210_priv *wil)
 159 {
 160         cancel_work_sync(&wil->disconnect_worker);
 161         wil6210_disconnect(wil, NULL);
 162         wmi_event_flush(wil);
 163         destroy_workqueue(wil->wmi_wq_conn);
 164         destroy_workqueue(wil->wmi_wq);
 165 }
 166
 167 static void wil_target_reset(struct wil6210_priv *wil)
 168 {
 169         wil_dbg_misc(wil, "Resetting...\n");
 170
 171         /* register write */
 172 #define W(a, v) iowrite32(v, wil->csr + HOSTADDR(a))
 173         /* register set = read, OR, write */
 174 #define S(a, v) iowrite32(ioread32(wil->csr + HOSTADDR(a)) | v, \
 175                 wil->csr + HOSTADDR(a))
 176
 177         /* hpal_perst_from_pad_src_n_mask */
 178         S(RGF_USER_CLKS_CTL_SW_RST_MASK_0, BIT(6));
 179         /* car_perst_rst_src_n_mask */
 180         S(RGF_USER_CLKS_CTL_SW_RST_MASK_0, BIT(7));
 181
 182         W(RGF_USER_MAC_CPU_0,  BIT(1)); /* mac_cpu_man_rst */
 183         W(RGF_USER_USER_CPU_0, BIT(1)); /* user_cpu_man_rst */
 184
 185         W(RGF_USER_CLKS_CTL_SW_RST_VEC_2, 0xFE000000);
 186         W(RGF_USER_CLKS_CTL_SW_RST_VEC_1, 0x0000003F);
 187         W(RGF_USER_CLKS_CTL_SW_RST_VEC_3, 0x00000170);
 188         W(RGF_USER_CLKS_CTL_SW_RST_VEC_0, 0xFFE7FC00);
 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         wil_dbg_misc(wil, "Reset completed\n");
 200
 201 #undef W
 202 #undef S
 203 }
 204
 205 void wil_mbox_ring_le2cpus(struct wil6210_mbox_ring *r)
 206 {
 207         le32_to_cpus(&r->base);
 208         le16_to_cpus(&r->entry_size);
 209         le16_to_cpus(&r->size);
 210         le32_to_cpus(&r->tail);
 211         le32_to_cpus(&r->head);
 212 }
 213
 214 static int wil_wait_for_fw_ready(struct wil6210_priv *wil)
 215 {
 216         ulong to = msecs_to_jiffies(1000);
 217         ulong left = wait_for_completion_timeout(&wil->wmi_ready, to);
 218         if (0 == left) {
 219                 wil_err(wil, "Firmware not ready\n");
 220                 return -ETIME;
 221         } else {
 222                 wil_dbg_misc(wil, "FW ready after %d ms\n",
 223                              jiffies_to_msecs(to-left));
 224         }
 225         return 0;
 226 }
 227
 228 /*
 229  * We reset all the structures, and we reset the UMAC.
 230  * After calling this routine, you're expected to reload
 231  * the firmware.
 232  */
 233 int wil_reset(struct wil6210_priv *wil)
 234 {
 235         int rc;
 236
 237         cancel_work_sync(&wil->disconnect_worker);
 238         wil6210_disconnect(wil, NULL);
 239
 240         wil6210_disable_irq(wil);
 241         wil->status = 0;
 242
 243         wmi_event_flush(wil);
 244
 245         flush_workqueue(wil->wmi_wq_conn);
 246         flush_workqueue(wil->wmi_wq);
 247
 248         /* TODO: put MAC in reset */
 249         wil_target_reset(wil);
 250
 251         /* init after reset */
 252         wil->pending_connect_cid = -1;
 253         reinit_completion(&wil->wmi_ready);
 254
 255         /* TODO: release MAC reset */
 256         wil6210_enable_irq(wil);
 257
 258         /* we just started MAC, wait for FW ready */
 259         rc = wil_wait_for_fw_ready(wil);
 260
 261         return rc;
 262 }
 263
 264
 265 void wil_link_on(struct wil6210_priv *wil)
 266 {
 267         struct net_device *ndev = wil_to_ndev(wil);
 268
 269         wil_dbg_misc(wil, "%s()\n", __func__);
 270
 271         netif_carrier_on(ndev);
 272         netif_tx_wake_all_queues(ndev);
 273 }
 274
 275 void wil_link_off(struct wil6210_priv *wil)
 276 {
 277         struct net_device *ndev = wil_to_ndev(wil);
 278
 279         wil_dbg_misc(wil, "%s()\n", __func__);
 280
 281         netif_tx_stop_all_queues(ndev);
 282         netif_carrier_off(ndev);
 283 }
 284
 285 static int __wil_up(struct wil6210_priv *wil)
 286 {
 287         struct net_device *ndev = wil_to_ndev(wil);
 288         struct wireless_dev *wdev = wil->wdev;
 289         int rc;
 290
 291         rc = wil_reset(wil);
 292         if (rc)
 293                 return rc;
 294
 295         /* Rx VRING. After MAC and beacon */
 296         rc = wil_rx_init(wil);
 297         if (rc)
 298                 return rc;
 299
 300         switch (wdev->iftype) {
 301         case NL80211_IFTYPE_STATION:
 302                 wil_dbg_misc(wil, "type: STATION\n");
 303                 ndev->type = ARPHRD_ETHER;
 304                 break;
 305         case NL80211_IFTYPE_AP:
 306                 wil_dbg_misc(wil, "type: AP\n");
 307                 ndev->type = ARPHRD_ETHER;
 308                 break;
 309         case NL80211_IFTYPE_P2P_CLIENT:
 310                 wil_dbg_misc(wil, "type: P2P_CLIENT\n");
 311                 ndev->type = ARPHRD_ETHER;
 312                 break;
 313         case NL80211_IFTYPE_P2P_GO:
 314                 wil_dbg_misc(wil, "type: P2P_GO\n");
 315                 ndev->type = ARPHRD_ETHER;
 316                 break;
 317         case NL80211_IFTYPE_MONITOR:
 318                 wil_dbg_misc(wil, "type: Monitor\n");
 319                 ndev->type = ARPHRD_IEEE80211_RADIOTAP;
 320                 /* ARPHRD_IEEE80211 or ARPHRD_IEEE80211_RADIOTAP ? */
 321                 break;
 322         default:
 323                 return -EOPNOTSUPP;
 324         }
 325
 326         /* MAC address - pre-requisite for other commands */
 327         wmi_set_mac_address(wil, ndev->dev_addr);
 328
 329
 330         napi_enable(&wil->napi_rx);
 331         napi_enable(&wil->napi_tx);
 332
 333         return 0;
 334 }
 335
 336 int wil_up(struct wil6210_priv *wil)
 337 {
 338         int rc;
 339
 340         mutex_lock(&wil->mutex);
 341         rc = __wil_up(wil);
 342         mutex_unlock(&wil->mutex);
 343
 344         return rc;
 345 }
 346
 347 static int __wil_down(struct wil6210_priv *wil)
 348 {
 349         napi_disable(&wil->napi_rx);
 350         napi_disable(&wil->napi_tx);
 351
 352         if (wil->scan_request) {
 353                 cfg80211_scan_done(wil->scan_request, true);
 354                 wil->scan_request = NULL;
 355         }
 356
 357         wil6210_disconnect(wil, NULL);
 358         wil_rx_fini(wil);
 359
 360         return 0;
 361 }
 362
 363 int wil_down(struct wil6210_priv *wil)
 364 {
 365         int rc;
 366
 367         mutex_lock(&wil->mutex);
 368         rc = __wil_down(wil);
 369         mutex_unlock(&wil->mutex);
 370
 371         return rc;
 372 }