LXR linux/drivers/net/wireless/ath/wil6210/interrupt.c

   1/*
   2 * Copyright (c) 2012-2017 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/interrupt.h>
  18
  19#include "wil6210.h"
  20#include "trace.h"
  21
  22/**
  23 * Theory of operation:
  24 *
  25 * There is ISR pseudo-cause register,
  26 * dma_rgf->DMA_RGF.PSEUDO_CAUSE.PSEUDO_CAUSE
  27 * Its bits represents OR'ed bits from 3 real ISR registers:
  28 * TX, RX, and MISC.
  29 *
  30 * Registers may be configured to either "write 1 to clear" or
  31 * "clear on read" mode
  32 *
  33 * When handling interrupt, one have to mask/unmask interrupts for the
  34 * real ISR registers, or hardware may malfunction.
  35 *
  36 */
  37
  38#define WIL6210_IRQ_DISABLE             (0xFFFFFFFFUL)
  39#define WIL6210_IRQ_DISABLE_NO_HALP     (0xF7FFFFFFUL)
  40#define WIL6210_IMC_RX          (BIT_DMA_EP_RX_ICR_RX_DONE | \
  41                                 BIT_DMA_EP_RX_ICR_RX_HTRSH)
  42#define WIL6210_IMC_RX_NO_RX_HTRSH (WIL6210_IMC_RX & \
  43                                    (~(BIT_DMA_EP_RX_ICR_RX_HTRSH)))
  44#define WIL6210_IMC_TX          (BIT_DMA_EP_TX_ICR_TX_DONE | \
  45                                BIT_DMA_EP_TX_ICR_TX_DONE_N(0))
  46#define WIL6210_IMC_MISC_NO_HALP        (ISR_MISC_FW_READY | \
  47                                         ISR_MISC_MBOX_EVT | \
  48                                         ISR_MISC_FW_ERROR)
  49#define WIL6210_IMC_MISC                (WIL6210_IMC_MISC_NO_HALP | \
  50                                         BIT_DMA_EP_MISC_ICR_HALP)
  51#define WIL6210_IRQ_PSEUDO_MASK (u32)(~(BIT_DMA_PSEUDO_CAUSE_RX | \
  52                                        BIT_DMA_PSEUDO_CAUSE_TX | \
  53                                        BIT_DMA_PSEUDO_CAUSE_MISC))
  54
  55#if defined(CONFIG_WIL6210_ISR_COR)
  56/* configure to Clear-On-Read mode */
  57#define WIL_ICR_ICC_VALUE       (0xFFFFFFFFUL)
  58#define WIL_ICR_ICC_MISC_VALUE  (0xF7FFFFFFUL)
  59
  60static inline void wil_icr_clear(u32 x, void __iomem *addr)
  61{
  62}
  63#else /* defined(CONFIG_WIL6210_ISR_COR) */
  64/* configure to Write-1-to-Clear mode */
  65#define WIL_ICR_ICC_VALUE       (0UL)
  66#define WIL_ICR_ICC_MISC_VALUE  (0UL)
  67
  68static inline void wil_icr_clear(u32 x, void __iomem *addr)
  69{
  70        writel(x, addr);
  71}
  72#endif /* defined(CONFIG_WIL6210_ISR_COR) */
  73
  74static inline u32 wil_ioread32_and_clear(void __iomem *addr)
  75{
  76        u32 x = readl(addr);
  77
  78        wil_icr_clear(x, addr);
  79
  80        return x;
  81}
  82
  83static void wil6210_mask_irq_tx(struct wil6210_priv *wil)
  84{
  85        wil_w(wil, RGF_DMA_EP_TX_ICR + offsetof(struct RGF_ICR, IMS),
  86              WIL6210_IRQ_DISABLE);
  87}
  88
  89static void wil6210_mask_irq_rx(struct wil6210_priv *wil)
  90{
  91        wil_w(wil, RGF_DMA_EP_RX_ICR + offsetof(struct RGF_ICR, IMS),
  92              WIL6210_IRQ_DISABLE);
  93}
  94
  95static void wil6210_mask_irq_misc(struct wil6210_priv *wil, bool mask_halp)
  96{
  97        wil_dbg_irq(wil, "mask_irq_misc: mask_halp(%s)\n",
  98                    mask_halp ? "true" : "false");
  99
 100        wil_w(wil, RGF_DMA_EP_MISC_ICR + offsetof(struct RGF_ICR, IMS),
 101              mask_halp ? WIL6210_IRQ_DISABLE : WIL6210_IRQ_DISABLE_NO_HALP);
 102}
 103
 104void wil6210_mask_halp(struct wil6210_priv *wil)
 105{
 106        wil_dbg_irq(wil, "mask_halp\n");
 107
 108        wil_w(wil, RGF_DMA_EP_MISC_ICR + offsetof(struct RGF_ICR, IMS),
 109              BIT_DMA_EP_MISC_ICR_HALP);
 110}
 111
 112static void wil6210_mask_irq_pseudo(struct wil6210_priv *wil)
 113{
 114        wil_dbg_irq(wil, "mask_irq_pseudo\n");
 115
 116        wil_w(wil, RGF_DMA_PSEUDO_CAUSE_MASK_SW, WIL6210_IRQ_DISABLE);
 117
 118        clear_bit(wil_status_irqen, wil->status);
 119}
 120
 121void wil6210_unmask_irq_tx(struct wil6210_priv *wil)
 122{
 123        wil_w(wil, RGF_DMA_EP_TX_ICR + offsetof(struct RGF_ICR, IMC),
 124              WIL6210_IMC_TX);
 125}
 126
 127void wil6210_unmask_irq_rx(struct wil6210_priv *wil)
 128{
 129        bool unmask_rx_htrsh = test_bit(wil_status_fwconnected, wil->status);
 130
 131        wil_w(wil, RGF_DMA_EP_RX_ICR + offsetof(struct RGF_ICR, IMC),
 132              unmask_rx_htrsh ? WIL6210_IMC_RX : WIL6210_IMC_RX_NO_RX_HTRSH);
 133}
 134
 135static void wil6210_unmask_irq_misc(struct wil6210_priv *wil, bool unmask_halp)
 136{
 137        wil_dbg_irq(wil, "unmask_irq_misc: unmask_halp(%s)\n",
 138                    unmask_halp ? "true" : "false");
 139
 140        wil_w(wil, RGF_DMA_EP_MISC_ICR + offsetof(struct RGF_ICR, IMC),
 141              unmask_halp ? WIL6210_IMC_MISC : WIL6210_IMC_MISC_NO_HALP);
 142}
 143
 144static void wil6210_unmask_halp(struct wil6210_priv *wil)
 145{
 146        wil_dbg_irq(wil, "unmask_halp\n");
 147
 148        wil_w(wil, RGF_DMA_EP_MISC_ICR + offsetof(struct RGF_ICR, IMC),
 149              BIT_DMA_EP_MISC_ICR_HALP);
 150}
 151
 152static void wil6210_unmask_irq_pseudo(struct wil6210_priv *wil)
 153{
 154        wil_dbg_irq(wil, "unmask_irq_pseudo\n");
 155
 156        set_bit(wil_status_irqen, wil->status);
 157
 158        wil_w(wil, RGF_DMA_PSEUDO_CAUSE_MASK_SW, WIL6210_IRQ_PSEUDO_MASK);
 159}
 160
 161void wil_mask_irq(struct wil6210_priv *wil)
 162{
 163        wil_dbg_irq(wil, "mask_irq\n");
 164
 165        wil6210_mask_irq_tx(wil);
 166        wil6210_mask_irq_rx(wil);
 167        wil6210_mask_irq_misc(wil, true);
 168        wil6210_mask_irq_pseudo(wil);
 169}
 170
 171void wil_unmask_irq(struct wil6210_priv *wil)
 172{
 173        wil_dbg_irq(wil, "unmask_irq\n");
 174
 175        wil_w(wil, RGF_DMA_EP_RX_ICR + offsetof(struct RGF_ICR, ICC),
 176              WIL_ICR_ICC_VALUE);
 177        wil_w(wil, RGF_DMA_EP_TX_ICR + offsetof(struct RGF_ICR, ICC),
 178              WIL_ICR_ICC_VALUE);
 179        wil_w(wil, RGF_DMA_EP_MISC_ICR + offsetof(struct RGF_ICR, ICC),
 180              WIL_ICR_ICC_MISC_VALUE);
 181
 182        wil6210_unmask_irq_pseudo(wil);
 183        wil6210_unmask_irq_tx(wil);
 184        wil6210_unmask_irq_rx(wil);
 185        wil6210_unmask_irq_misc(wil, true);
 186}
 187
 188void wil_configure_interrupt_moderation(struct wil6210_priv *wil)
 189{
 190        wil_dbg_irq(wil, "configure_interrupt_moderation\n");
 191
 192        /* disable interrupt moderation for monitor
 193         * to get better timestamp precision
 194         */
 195        if (wil->wdev->iftype == NL80211_IFTYPE_MONITOR)
 196                return;
 197
 198        /* Disable and clear tx counter before (re)configuration */
 199        wil_w(wil, RGF_DMA_ITR_TX_CNT_CTL, BIT_DMA_ITR_TX_CNT_CTL_CLR);
 200        wil_w(wil, RGF_DMA_ITR_TX_CNT_TRSH, wil->tx_max_burst_duration);
 201        wil_info(wil, "set ITR_TX_CNT_TRSH = %d usec\n",
 202                 wil->tx_max_burst_duration);
 203        /* Configure TX max burst duration timer to use usec units */
 204        wil_w(wil, RGF_DMA_ITR_TX_CNT_CTL,
 205              BIT_DMA_ITR_TX_CNT_CTL_EN | BIT_DMA_ITR_TX_CNT_CTL_EXT_TIC_SEL);
 206
 207        /* Disable and clear tx idle counter before (re)configuration */
 208        wil_w(wil, RGF_DMA_ITR_TX_IDL_CNT_CTL, BIT_DMA_ITR_TX_IDL_CNT_CTL_CLR);
 209        wil_w(wil, RGF_DMA_ITR_TX_IDL_CNT_TRSH, wil->tx_interframe_timeout);
 210        wil_info(wil, "set ITR_TX_IDL_CNT_TRSH = %d usec\n",
 211                 wil->tx_interframe_timeout);
 212        /* Configure TX max burst duration timer to use usec units */
 213        wil_w(wil, RGF_DMA_ITR_TX_IDL_CNT_CTL, BIT_DMA_ITR_TX_IDL_CNT_CTL_EN |
 214              BIT_DMA_ITR_TX_IDL_CNT_CTL_EXT_TIC_SEL);
 215
 216        /* Disable and clear rx counter before (re)configuration */
 217        wil_w(wil, RGF_DMA_ITR_RX_CNT_CTL, BIT_DMA_ITR_RX_CNT_CTL_CLR);
 218        wil_w(wil, RGF_DMA_ITR_RX_CNT_TRSH, wil->rx_max_burst_duration);
 219        wil_info(wil, "set ITR_RX_CNT_TRSH = %d usec\n",
 220                 wil->rx_max_burst_duration);
 221        /* Configure TX max burst duration timer to use usec units */
 222        wil_w(wil, RGF_DMA_ITR_RX_CNT_CTL,
 223              BIT_DMA_ITR_RX_CNT_CTL_EN | BIT_DMA_ITR_RX_CNT_CTL_EXT_TIC_SEL);
 224
 225        /* Disable and clear rx idle counter before (re)configuration */
 226        wil_w(wil, RGF_DMA_ITR_RX_IDL_CNT_CTL, BIT_DMA_ITR_RX_IDL_CNT_CTL_CLR);
 227        wil_w(wil, RGF_DMA_ITR_RX_IDL_CNT_TRSH, wil->rx_interframe_timeout);
 228        wil_info(wil, "set ITR_RX_IDL_CNT_TRSH = %d usec\n",
 229                 wil->rx_interframe_timeout);
 230        /* Configure TX max burst duration timer to use usec units */
 231        wil_w(wil, RGF_DMA_ITR_RX_IDL_CNT_CTL, BIT_DMA_ITR_RX_IDL_CNT_CTL_EN |
 232              BIT_DMA_ITR_RX_IDL_CNT_CTL_EXT_TIC_SEL);
 233}
 234
 235static irqreturn_t wil6210_irq_rx(int irq, void *cookie)
 236{
 237        struct wil6210_priv *wil = cookie;
 238        u32 isr = wil_ioread32_and_clear(wil->csr +
 239                                         HOSTADDR(RGF_DMA_EP_RX_ICR) +
 240                                         offsetof(struct RGF_ICR, ICR));
 241        bool need_unmask = true;
 242
 243        trace_wil6210_irq_rx(isr);
 244        wil_dbg_irq(wil, "ISR RX 0x%08x\n", isr);
 245
 246        if (unlikely(!isr)) {
 247                wil_err(wil, "spurious IRQ: RX\n");
 248                return IRQ_NONE;
 249        }
 250
 251        wil6210_mask_irq_rx(wil);
 252
 253        /* RX_DONE and RX_HTRSH interrupts are the same if interrupt
 254         * moderation is not used. Interrupt moderation may cause RX
 255         * buffer overflow while RX_DONE is delayed. The required
 256         * action is always the same - should empty the accumulated
 257         * packets from the RX ring.
 258         */
 259        if (likely(isr & (BIT_DMA_EP_RX_ICR_RX_DONE |
 260                          BIT_DMA_EP_RX_ICR_RX_HTRSH))) {
 261                wil_dbg_irq(wil, "RX done / RX_HTRSH received, ISR (0x%x)\n",
 262                            isr);
 263
 264                isr &= ~(BIT_DMA_EP_RX_ICR_RX_DONE |
 265                         BIT_DMA_EP_RX_ICR_RX_HTRSH);
 266                if (likely(test_bit(wil_status_fwready, wil->status))) {
 267                        if (likely(test_bit(wil_status_napi_en, wil->status))) {
 268                                wil_dbg_txrx(wil, "NAPI(Rx) schedule\n");
 269                                need_unmask = false;
 270                                napi_schedule(&wil->napi_rx);
 271                        } else {
 272                                wil_err(wil,
 273                                        "Got Rx interrupt while stopping interface\n");
 274                        }
 275                } else {
 276                        wil_err(wil, "Got Rx interrupt while in reset\n");
 277                }
 278        }
 279
 280        if (unlikely(isr))
 281                wil_err(wil, "un-handled RX ISR bits 0x%08x\n", isr);
 282
 283        /* Rx IRQ will be enabled when NAPI processing finished */
 284
 285        atomic_inc(&wil->isr_count_rx);
 286
 287        if (unlikely(need_unmask))
 288                wil6210_unmask_irq_rx(wil);
 289
 290        return IRQ_HANDLED;
 291}
 292
 293static irqreturn_t wil6210_irq_tx(int irq, void *cookie)
 294{
 295        struct wil6210_priv *wil = cookie;
 296        u32 isr = wil_ioread32_and_clear(wil->csr +
 297                                         HOSTADDR(RGF_DMA_EP_TX_ICR) +
 298                                         offsetof(struct RGF_ICR, ICR));
 299        bool need_unmask = true;
 300
 301        trace_wil6210_irq_tx(isr);
 302        wil_dbg_irq(wil, "ISR TX 0x%08x\n", isr);
 303
 304        if (unlikely(!isr)) {
 305                wil_err(wil, "spurious IRQ: TX\n");
 306                return IRQ_NONE;
 307        }
 308
 309        wil6210_mask_irq_tx(wil);
 310
 311        if (likely(isr & BIT_DMA_EP_TX_ICR_TX_DONE)) {
 312                wil_dbg_irq(wil, "TX done\n");
 313                isr &= ~BIT_DMA_EP_TX_ICR_TX_DONE;
 314                /* clear also all VRING interrupts */
 315                isr &= ~(BIT(25) - 1UL);
 316                if (likely(test_bit(wil_status_fwready, wil->status))) {
 317                        wil_dbg_txrx(wil, "NAPI(Tx) schedule\n");
 318                        need_unmask = false;
 319                        napi_schedule(&wil->napi_tx);
 320                } else {
 321                        wil_err(wil, "Got Tx interrupt while in reset\n");
 322                }
 323        }
 324
 325        if (unlikely(isr))
 326                wil_err(wil, "un-handled TX ISR bits 0x%08x\n", isr);
 327
 328        /* Tx IRQ will be enabled when NAPI processing finished */
 329
 330        atomic_inc(&wil->isr_count_tx);
 331
 332        if (unlikely(need_unmask))
 333                wil6210_unmask_irq_tx(wil);
 334
 335        return IRQ_HANDLED;
 336}
 337
 338static void wil_notify_fw_error(struct wil6210_priv *wil)
 339{
 340        struct device *dev = &wil_to_ndev(wil)->dev;
 341        char *envp[3] = {
 342                [0] = "SOURCE=wil6210",
 343                [1] = "EVENT=FW_ERROR",
 344                [2] = NULL,
 345        };
 346        wil_err(wil, "Notify about firmware error\n");
 347        kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp);
 348}
 349
 350static void wil_cache_mbox_regs(struct wil6210_priv *wil)
 351{
 352        /* make shadow copy of registers that should not change on run time */
 353        wil_memcpy_fromio_32(&wil->mbox_ctl, wil->csr + HOST_MBOX,
 354                             sizeof(struct wil6210_mbox_ctl));
 355        wil_mbox_ring_le2cpus(&wil->mbox_ctl.rx);
 356        wil_mbox_ring_le2cpus(&wil->mbox_ctl.tx);
 357}
 358
 359static irqreturn_t wil6210_irq_misc(int irq, void *cookie)
 360{
 361        struct wil6210_priv *wil = cookie;
 362        u32 isr = wil_ioread32_and_clear(wil->csr +
 363                                         HOSTADDR(RGF_DMA_EP_MISC_ICR) +
 364                                         offsetof(struct RGF_ICR, ICR));
 365
 366        trace_wil6210_irq_misc(isr);
 367        wil_dbg_irq(wil, "ISR MISC 0x%08x\n", isr);
 368
 369        if (!isr) {
 370                wil_err(wil, "spurious IRQ: MISC\n");
 371                return IRQ_NONE;
 372        }
 373
 374        wil6210_mask_irq_misc(wil, false);
 375
 376        if (isr & ISR_MISC_FW_ERROR) {
 377                u32 fw_assert_code = wil_r(wil, RGF_FW_ASSERT_CODE);
 378                u32 ucode_assert_code = wil_r(wil, RGF_UCODE_ASSERT_CODE);
 379
 380                wil_err(wil,
 381                        "Firmware error detected, assert codes FW 0x%08x, UCODE 0x%08x\n",
 382                        fw_assert_code, ucode_assert_code);
 383                clear_bit(wil_status_fwready, wil->status);
 384                /*
 385                 * do not clear @isr here - we do 2-nd part in thread
 386                 * there, user space get notified, and it should be done
 387                 * in non-atomic context
 388                 */
 389        }
 390
 391        if (isr & ISR_MISC_FW_READY) {
 392                wil_dbg_irq(wil, "IRQ: FW ready\n");
 393                wil_cache_mbox_regs(wil);
 394                set_bit(wil_status_mbox_ready, wil->status);
 395                /**
 396                 * Actual FW ready indicated by the
 397                 * WMI_FW_READY_EVENTID
 398                 */
 399                isr &= ~ISR_MISC_FW_READY;
 400        }
 401
 402        if (isr & BIT_DMA_EP_MISC_ICR_HALP) {
 403                wil_dbg_irq(wil, "irq_misc: HALP IRQ invoked\n");
 404                wil6210_mask_halp(wil);
 405                isr &= ~BIT_DMA_EP_MISC_ICR_HALP;
 406                complete(&wil->halp.comp);
 407        }
 408
 409        wil->isr_misc = isr;
 410
 411        if (isr) {
 412                return IRQ_WAKE_THREAD;
 413        } else {
 414                wil6210_unmask_irq_misc(wil, false);
 415                return IRQ_HANDLED;
 416        }
 417}
 418
 419static irqreturn_t wil6210_irq_misc_thread(int irq, void *cookie)
 420{
 421        struct wil6210_priv *wil = cookie;
 422        u32 isr = wil->isr_misc;
 423
 424        trace_wil6210_irq_misc_thread(isr);
 425        wil_dbg_irq(wil, "Thread ISR MISC 0x%08x\n", isr);
 426
 427        if (isr & ISR_MISC_FW_ERROR) {
 428                wil->recovery_state = fw_recovery_pending;
 429                wil_fw_core_dump(wil);
 430                wil_notify_fw_error(wil);
 431                isr &= ~ISR_MISC_FW_ERROR;
 432                if (wil->platform_ops.notify) {
 433                        wil_err(wil, "notify platform driver about FW crash");
 434                        wil->platform_ops.notify(wil->platform_handle,
 435                                                 WIL_PLATFORM_EVT_FW_CRASH);
 436                } else {
 437                        wil_fw_error_recovery(wil);
 438                }
 439        }
 440        if (isr & ISR_MISC_MBOX_EVT) {
 441                wil_dbg_irq(wil, "MBOX event\n");
 442                wmi_recv_cmd(wil);
 443                isr &= ~ISR_MISC_MBOX_EVT;
 444        }
 445
 446        if (isr)
 447                wil_dbg_irq(wil, "un-handled MISC ISR bits 0x%08x\n", isr);
 448
 449        wil->isr_misc = 0;
 450
 451        wil6210_unmask_irq_misc(wil, false);
 452
 453        return IRQ_HANDLED;
 454}
 455
 456/**
 457 * thread IRQ handler
 458 */
 459static irqreturn_t wil6210_thread_irq(int irq, void *cookie)
 460{
 461        struct wil6210_priv *wil = cookie;
 462
 463        wil_dbg_irq(wil, "Thread IRQ\n");
 464        /* Discover real IRQ cause */
 465        if (wil->isr_misc)
 466                wil6210_irq_misc_thread(irq, cookie);
 467
 468        wil6210_unmask_irq_pseudo(wil);
 469
 470        return IRQ_HANDLED;
 471}
 472
 473/* DEBUG
 474 * There is subtle bug in hardware that causes IRQ to raise when it should be
 475 * masked. It is quite rare and hard to debug.
 476 *
 477 * Catch irq issue if it happens and print all I can.
 478 */
 479static int wil6210_debug_irq_mask(struct wil6210_priv *wil, u32 pseudo_cause)
 480{
 481        if (!test_bit(wil_status_irqen, wil->status)) {
 482                u32 icm_rx = wil_ioread32_and_clear(wil->csr +
 483                                HOSTADDR(RGF_DMA_EP_RX_ICR) +
 484                                offsetof(struct RGF_ICR, ICM));
 485                u32 icr_rx = wil_ioread32_and_clear(wil->csr +
 486                                HOSTADDR(RGF_DMA_EP_RX_ICR) +
 487                                offsetof(struct RGF_ICR, ICR));
 488                u32 imv_rx = wil_r(wil, RGF_DMA_EP_RX_ICR +
 489                                   offsetof(struct RGF_ICR, IMV));
 490                u32 icm_tx = wil_ioread32_and_clear(wil->csr +
 491                                HOSTADDR(RGF_DMA_EP_TX_ICR) +
 492                                offsetof(struct RGF_ICR, ICM));
 493                u32 icr_tx = wil_ioread32_and_clear(wil->csr +
 494                                HOSTADDR(RGF_DMA_EP_TX_ICR) +
 495                                offsetof(struct RGF_ICR, ICR));
 496                u32 imv_tx = wil_r(wil, RGF_DMA_EP_TX_ICR +
 497                                   offsetof(struct RGF_ICR, IMV));
 498                u32 icm_misc = wil_ioread32_and_clear(wil->csr +
 499                                HOSTADDR(RGF_DMA_EP_MISC_ICR) +
 500                                offsetof(struct RGF_ICR, ICM));
 501                u32 icr_misc = wil_ioread32_and_clear(wil->csr +
 502                                HOSTADDR(RGF_DMA_EP_MISC_ICR) +
 503                                offsetof(struct RGF_ICR, ICR));
 504                u32 imv_misc = wil_r(wil, RGF_DMA_EP_MISC_ICR +
 505                                     offsetof(struct RGF_ICR, IMV));
 506
 507                /* HALP interrupt can be unmasked when misc interrupts are
 508                 * masked
 509                 */
 510                if (icr_misc & BIT_DMA_EP_MISC_ICR_HALP)
 511                        return 0;
 512
 513                wil_err(wil, "IRQ when it should be masked: pseudo 0x%08x\n"
 514                                "Rx   icm:icr:imv 0x%08x 0x%08x 0x%08x\n"
 515                                "Tx   icm:icr:imv 0x%08x 0x%08x 0x%08x\n"
 516                                "Misc icm:icr:imv 0x%08x 0x%08x 0x%08x\n",
 517                                pseudo_cause,
 518                                icm_rx, icr_rx, imv_rx,
 519                                icm_tx, icr_tx, imv_tx,
 520                                icm_misc, icr_misc, imv_misc);
 521
 522                return -EINVAL;
 523        }
 524
 525        return 0;
 526}
 527
 528static irqreturn_t wil6210_hardirq(int irq, void *cookie)
 529{
 530        irqreturn_t rc = IRQ_HANDLED;
 531        struct wil6210_priv *wil = cookie;
 532        u32 pseudo_cause = wil_r(wil, RGF_DMA_PSEUDO_CAUSE);
 533
 534        /**
 535         * pseudo_cause is Clear-On-Read, no need to ACK
 536         */
 537        if (unlikely((pseudo_cause == 0) || ((pseudo_cause & 0xff) == 0xff)))
 538                return IRQ_NONE;
 539
 540        /* FIXME: IRQ mask debug */
 541        if (unlikely(wil6210_debug_irq_mask(wil, pseudo_cause)))
 542                return IRQ_NONE;
 543
 544        trace_wil6210_irq_pseudo(pseudo_cause);
 545        wil_dbg_irq(wil, "Pseudo IRQ 0x%08x\n", pseudo_cause);
 546
 547        wil6210_mask_irq_pseudo(wil);
 548
 549        /* Discover real IRQ cause
 550         * There are 2 possible phases for every IRQ:
 551         * - hard IRQ handler called right here
 552         * - threaded handler called later
 553         *
 554         * Hard IRQ handler reads and clears ISR.
 555         *
 556         * If threaded handler requested, hard IRQ handler
 557         * returns IRQ_WAKE_THREAD and saves ISR register value
 558         * for the threaded handler use.
 559         *
 560         * voting for wake thread - need at least 1 vote
 561         */
 562        if ((pseudo_cause & BIT_DMA_PSEUDO_CAUSE_RX) &&
 563            (wil6210_irq_rx(irq, cookie) == IRQ_WAKE_THREAD))
 564                rc = IRQ_WAKE_THREAD;
 565
 566        if ((pseudo_cause & BIT_DMA_PSEUDO_CAUSE_TX) &&
 567            (wil6210_irq_tx(irq, cookie) == IRQ_WAKE_THREAD))
 568                rc = IRQ_WAKE_THREAD;
 569
 570        if ((pseudo_cause & BIT_DMA_PSEUDO_CAUSE_MISC) &&
 571            (wil6210_irq_misc(irq, cookie) == IRQ_WAKE_THREAD))
 572                rc = IRQ_WAKE_THREAD;
 573
 574        /* if thread is requested, it will unmask IRQ */
 575        if (rc != IRQ_WAKE_THREAD)
 576                wil6210_unmask_irq_pseudo(wil);
 577
 578        return rc;
 579}
 580
 581/* can't use wil_ioread32_and_clear because ICC value is not set yet */
 582static inline void wil_clear32(void __iomem *addr)
 583{
 584        u32 x = readl(addr);
 585
 586        writel(x, addr);
 587}
 588
 589void wil6210_clear_irq(struct wil6210_priv *wil)
 590{
 591        wil_clear32(wil->csr + HOSTADDR(RGF_DMA_EP_RX_ICR) +
 592                    offsetof(struct RGF_ICR, ICR));
 593        wil_clear32(wil->csr + HOSTADDR(RGF_DMA_EP_TX_ICR) +
 594                    offsetof(struct RGF_ICR, ICR));
 595        wil_clear32(wil->csr + HOSTADDR(RGF_DMA_EP_MISC_ICR) +
 596                    offsetof(struct RGF_ICR, ICR));
 597        wmb(); /* make sure write completed */
 598}
 599
 600void wil6210_set_halp(struct wil6210_priv *wil)
 601{
 602        wil_dbg_irq(wil, "set_halp\n");
 603
 604        wil_w(wil, RGF_DMA_EP_MISC_ICR + offsetof(struct RGF_ICR, ICS),
 605              BIT_DMA_EP_MISC_ICR_HALP);
 606}
 607
 608void wil6210_clear_halp(struct wil6210_priv *wil)
 609{
 610        wil_dbg_irq(wil, "clear_halp\n");
 611
 612        wil_w(wil, RGF_DMA_EP_MISC_ICR + offsetof(struct RGF_ICR, ICR),
 613              BIT_DMA_EP_MISC_ICR_HALP);
 614        wil6210_unmask_halp(wil);
 615}
 616
 617int wil6210_init_irq(struct wil6210_priv *wil, int irq, bool use_msi)
 618{
 619        int rc;
 620
 621        wil_dbg_misc(wil, "init_irq: %s\n", use_msi ? "MSI" : "INTx");
 622
 623        rc = request_threaded_irq(irq, wil6210_hardirq,
 624                                  wil6210_thread_irq,
 625                                  use_msi ? 0 : IRQF_SHARED,
 626                                  WIL_NAME, wil);
 627        return rc;
 628}
 629
 630void wil6210_fini_irq(struct wil6210_priv *wil, int irq)
 631{
 632        wil_dbg_misc(wil, "fini_irq:\n");
 633
 634        wil_mask_irq(wil);
 635        free_irq(irq, wil);
 636}
 637