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

   1 /*
   2  * Copyright (c) 2012-2017 Qualcomm Atheros, Inc.
   3  * Copyright (c) 2018-2019, The Linux Foundation. All rights reserved.
   4  *
   5  * Permission to use, copy, modify, and/or distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 #include <linux/interrupt.h>
  19
  20 #include "wil6210.h"
  21 #include "trace.h"
  22
  23 /**
  24  * Theory of operation:
  25  *
  26  * There is ISR pseudo-cause register,
  27  * dma_rgf->DMA_RGF.PSEUDO_CAUSE.PSEUDO_CAUSE
  28  * Its bits represents OR'ed bits from 3 real ISR registers:
  29  * TX, RX, and MISC.
  30  *
  31  * Registers may be configured to either "write 1 to clear" or
  32  * "clear on read" mode
  33  *
  34  * When handling interrupt, one have to mask/unmask interrupts for the
  35  * real ISR registers, or hardware may malfunction.
  36  *
  37  */
  38
  39 #define WIL6210_IRQ_DISABLE             (0xFFFFFFFFUL)
  40 #define WIL6210_IRQ_DISABLE_NO_HALP     (0xF7FFFFFFUL)
  41 #define WIL6210_IMC_RX          (BIT_DMA_EP_RX_ICR_RX_DONE | \
  42                                  BIT_DMA_EP_RX_ICR_RX_HTRSH)
  43 #define WIL6210_IMC_RX_NO_RX_HTRSH (WIL6210_IMC_RX & \
  44                                     (~(BIT_DMA_EP_RX_ICR_RX_HTRSH)))
  45 #define WIL6210_IMC_TX          (BIT_DMA_EP_TX_ICR_TX_DONE | \
  46                                 BIT_DMA_EP_TX_ICR_TX_DONE_N(0))
  47 #define WIL6210_IMC_TX_EDMA             BIT_TX_STATUS_IRQ
  48 #define WIL6210_IMC_RX_EDMA             BIT_RX_STATUS_IRQ
  49 #define WIL6210_IMC_MISC_NO_HALP        (ISR_MISC_FW_READY | \
  50                                          ISR_MISC_MBOX_EVT | \
  51                                          ISR_MISC_FW_ERROR)
  52 #define WIL6210_IMC_MISC                (WIL6210_IMC_MISC_NO_HALP | \
  53                                          BIT_DMA_EP_MISC_ICR_HALP)
  54 #define WIL6210_IRQ_PSEUDO_MASK (u32)(~(BIT_DMA_PSEUDO_CAUSE_RX | \
  55                                         BIT_DMA_PSEUDO_CAUSE_TX | \
  56                                         BIT_DMA_PSEUDO_CAUSE_MISC))
  57
  58 #if defined(CONFIG_WIL6210_ISR_COR)
  59 /* configure to Clear-On-Read mode */
  60 #define WIL_ICR_ICC_VALUE       (0xFFFFFFFFUL)
  61 #define WIL_ICR_ICC_MISC_VALUE  (0xF7FFFFFFUL)
  62
  63 static inline void wil_icr_clear(u32 x, void __iomem *addr)
  64 {
  65 }
  66 #else /* defined(CONFIG_WIL6210_ISR_COR) */
  67 /* configure to Write-1-to-Clear mode */
  68 #define WIL_ICR_ICC_VALUE       (0UL)
  69 #define WIL_ICR_ICC_MISC_VALUE  (0UL)
  70
  71 static inline void wil_icr_clear(u32 x, void __iomem *addr)
  72 {
  73         writel(x, addr);
  74 }
  75 #endif /* defined(CONFIG_WIL6210_ISR_COR) */
  76
  77 static inline u32 wil_ioread32_and_clear(void __iomem *addr)
  78 {
  79         u32 x = readl(addr);
  80
  81         wil_icr_clear(x, addr);
  82
  83         return x;
  84 }
  85
  86 static void wil6210_mask_irq_tx(struct wil6210_priv *wil)
  87 {
  88         wil_w(wil, RGF_DMA_EP_TX_ICR + offsetof(struct RGF_ICR, IMS),
  89               WIL6210_IRQ_DISABLE);
  90 }
  91
  92 static void wil6210_mask_irq_tx_edma(struct wil6210_priv *wil)
  93 {
  94         wil_w(wil, RGF_INT_GEN_TX_ICR + offsetof(struct RGF_ICR, IMS),
  95               WIL6210_IRQ_DISABLE);
  96 }
  97
  98 static void wil6210_mask_irq_rx(struct wil6210_priv *wil)
  99 {
 100         wil_w(wil, RGF_DMA_EP_RX_ICR + offsetof(struct RGF_ICR, IMS),
 101               WIL6210_IRQ_DISABLE);
 102 }
 103
 104 static void wil6210_mask_irq_rx_edma(struct wil6210_priv *wil)
 105 {
 106         wil_w(wil, RGF_INT_GEN_RX_ICR + offsetof(struct RGF_ICR, IMS),
 107               WIL6210_IRQ_DISABLE);
 108 }
 109
 110 static void wil6210_mask_irq_misc(struct wil6210_priv *wil, bool mask_halp)
 111 {
 112         wil_dbg_irq(wil, "mask_irq_misc: mask_halp(%s)\n",
 113                     mask_halp ? "true" : "false");
 114
 115         wil_w(wil, RGF_DMA_EP_MISC_ICR + offsetof(struct RGF_ICR, IMS),
 116               mask_halp ? WIL6210_IRQ_DISABLE : WIL6210_IRQ_DISABLE_NO_HALP);
 117 }
 118
 119 void wil6210_mask_halp(struct wil6210_priv *wil)
 120 {
 121         wil_dbg_irq(wil, "mask_halp\n");
 122
 123         wil_w(wil, RGF_DMA_EP_MISC_ICR + offsetof(struct RGF_ICR, IMS),
 124               BIT_DMA_EP_MISC_ICR_HALP);
 125 }
 126
 127 static void wil6210_mask_irq_pseudo(struct wil6210_priv *wil)
 128 {
 129         wil_dbg_irq(wil, "mask_irq_pseudo\n");
 130
 131         wil_w(wil, RGF_DMA_PSEUDO_CAUSE_MASK_SW, WIL6210_IRQ_DISABLE);
 132
 133         clear_bit(wil_status_irqen, wil->status);
 134 }
 135
 136 void wil6210_unmask_irq_tx(struct wil6210_priv *wil)
 137 {
 138         wil_w(wil, RGF_DMA_EP_TX_ICR + offsetof(struct RGF_ICR, IMC),
 139               WIL6210_IMC_TX);
 140 }
 141
 142 void wil6210_unmask_irq_tx_edma(struct wil6210_priv *wil)
 143 {
 144         wil_w(wil, RGF_INT_GEN_TX_ICR + offsetof(struct RGF_ICR, IMC),
 145               WIL6210_IMC_TX_EDMA);
 146 }
 147
 148 void wil6210_unmask_irq_rx(struct wil6210_priv *wil)
 149 {
 150         bool unmask_rx_htrsh = atomic_read(&wil->connected_vifs) > 0;
 151
 152         wil_w(wil, RGF_DMA_EP_RX_ICR + offsetof(struct RGF_ICR, IMC),
 153               unmask_rx_htrsh ? WIL6210_IMC_RX : WIL6210_IMC_RX_NO_RX_HTRSH);
 154 }
 155
 156 void wil6210_unmask_irq_rx_edma(struct wil6210_priv *wil)
 157 {
 158         wil_w(wil, RGF_INT_GEN_RX_ICR + offsetof(struct RGF_ICR, IMC),
 159               WIL6210_IMC_RX_EDMA);
 160 }
 161
 162 static void wil6210_unmask_irq_misc(struct wil6210_priv *wil, bool unmask_halp)
 163 {
 164         wil_dbg_irq(wil, "unmask_irq_misc: unmask_halp(%s)\n",
 165                     unmask_halp ? "true" : "false");
 166
 167         wil_w(wil, RGF_DMA_EP_MISC_ICR + offsetof(struct RGF_ICR, IMC),
 168               unmask_halp ? WIL6210_IMC_MISC : WIL6210_IMC_MISC_NO_HALP);
 169 }
 170
 171 static void wil6210_unmask_halp(struct wil6210_priv *wil)
 172 {
 173         wil_dbg_irq(wil, "unmask_halp\n");
 174
 175         wil_w(wil, RGF_DMA_EP_MISC_ICR + offsetof(struct RGF_ICR, IMC),
 176               BIT_DMA_EP_MISC_ICR_HALP);
 177 }
 178
 179 static void wil6210_unmask_irq_pseudo(struct wil6210_priv *wil)
 180 {
 181         wil_dbg_irq(wil, "unmask_irq_pseudo\n");
 182
 183         set_bit(wil_status_irqen, wil->status);
 184
 185         wil_w(wil, RGF_DMA_PSEUDO_CAUSE_MASK_SW, WIL6210_IRQ_PSEUDO_MASK);
 186 }
 187
 188 void wil_mask_irq(struct wil6210_priv *wil)
 189 {
 190         wil_dbg_irq(wil, "mask_irq\n");
 191
 192         wil6210_mask_irq_tx(wil);
 193         wil6210_mask_irq_tx_edma(wil);
 194         wil6210_mask_irq_rx(wil);
 195         wil6210_mask_irq_rx_edma(wil);
 196         wil6210_mask_irq_misc(wil, true);
 197         wil6210_mask_irq_pseudo(wil);
 198 }
 199
 200 void wil_unmask_irq(struct wil6210_priv *wil)
 201 {
 202         wil_dbg_irq(wil, "unmask_irq\n");
 203
 204         wil_w(wil, RGF_DMA_EP_RX_ICR + offsetof(struct RGF_ICR, ICC),
 205               WIL_ICR_ICC_VALUE);
 206         wil_w(wil, RGF_DMA_EP_TX_ICR + offsetof(struct RGF_ICR, ICC),
 207               WIL_ICR_ICC_VALUE);
 208         wil_w(wil, RGF_DMA_EP_MISC_ICR + offsetof(struct RGF_ICR, ICC),
 209               WIL_ICR_ICC_MISC_VALUE);
 210         wil_w(wil, RGF_INT_GEN_TX_ICR + offsetof(struct RGF_ICR, ICC),
 211               WIL_ICR_ICC_VALUE);
 212         wil_w(wil, RGF_INT_GEN_RX_ICR + offsetof(struct RGF_ICR, ICC),
 213               WIL_ICR_ICC_VALUE);
 214
 215         wil6210_unmask_irq_pseudo(wil);
 216         if (wil->use_enhanced_dma_hw) {
 217                 wil6210_unmask_irq_tx_edma(wil);
 218                 wil6210_unmask_irq_rx_edma(wil);
 219         } else {
 220                 wil6210_unmask_irq_tx(wil);
 221                 wil6210_unmask_irq_rx(wil);
 222         }
 223         wil6210_unmask_irq_misc(wil, true);
 224 }
 225
 226 void wil_configure_interrupt_moderation_edma(struct wil6210_priv *wil)
 227 {
 228         u32 moderation;
 229
 230         wil_s(wil, RGF_INT_GEN_IDLE_TIME_LIMIT, WIL_EDMA_IDLE_TIME_LIMIT_USEC);
 231
 232         wil_s(wil, RGF_INT_GEN_TIME_UNIT_LIMIT, WIL_EDMA_TIME_UNIT_CLK_CYCLES);
 233
 234         /* Update RX and TX moderation */
 235         moderation = wil->rx_max_burst_duration |
 236                 (WIL_EDMA_AGG_WATERMARK << WIL_EDMA_AGG_WATERMARK_POS);
 237         wil_w(wil, RGF_INT_CTRL_INT_GEN_CFG_0, moderation);
 238         wil_w(wil, RGF_INT_CTRL_INT_GEN_CFG_1, moderation);
 239
 240         /* Treat special events as regular
 241          * (set bit 0 to 0x1 and clear bits 1-8)
 242          */
 243         wil_c(wil, RGF_INT_COUNT_ON_SPECIAL_EVT, 0x1FE);
 244         wil_s(wil, RGF_INT_COUNT_ON_SPECIAL_EVT, 0x1);
 245 }
 246
 247 void wil_configure_interrupt_moderation(struct wil6210_priv *wil)
 248 {
 249         struct wireless_dev *wdev = wil->main_ndev->ieee80211_ptr;
 250
 251         wil_dbg_irq(wil, "configure_interrupt_moderation\n");
 252
 253         /* disable interrupt moderation for monitor
 254          * to get better timestamp precision
 255          */
 256         if (wdev->iftype == NL80211_IFTYPE_MONITOR)
 257                 return;
 258
 259         /* Disable and clear tx counter before (re)configuration */
 260         wil_w(wil, RGF_DMA_ITR_TX_CNT_CTL, BIT_DMA_ITR_TX_CNT_CTL_CLR);
 261         wil_w(wil, RGF_DMA_ITR_TX_CNT_TRSH, wil->tx_max_burst_duration);
 262         wil_info(wil, "set ITR_TX_CNT_TRSH = %d usec\n",
 263                  wil->tx_max_burst_duration);
 264         /* Configure TX max burst duration timer to use usec units */
 265         wil_w(wil, RGF_DMA_ITR_TX_CNT_CTL,
 266               BIT_DMA_ITR_TX_CNT_CTL_EN | BIT_DMA_ITR_TX_CNT_CTL_EXT_TIC_SEL);
 267
 268         /* Disable and clear tx idle counter before (re)configuration */
 269         wil_w(wil, RGF_DMA_ITR_TX_IDL_CNT_CTL, BIT_DMA_ITR_TX_IDL_CNT_CTL_CLR);
 270         wil_w(wil, RGF_DMA_ITR_TX_IDL_CNT_TRSH, wil->tx_interframe_timeout);
 271         wil_info(wil, "set ITR_TX_IDL_CNT_TRSH = %d usec\n",
 272                  wil->tx_interframe_timeout);
 273         /* Configure TX max burst duration timer to use usec units */
 274         wil_w(wil, RGF_DMA_ITR_TX_IDL_CNT_CTL, BIT_DMA_ITR_TX_IDL_CNT_CTL_EN |
 275               BIT_DMA_ITR_TX_IDL_CNT_CTL_EXT_TIC_SEL);
 276
 277         /* Disable and clear rx counter before (re)configuration */
 278         wil_w(wil, RGF_DMA_ITR_RX_CNT_CTL, BIT_DMA_ITR_RX_CNT_CTL_CLR);
 279         wil_w(wil, RGF_DMA_ITR_RX_CNT_TRSH, wil->rx_max_burst_duration);
 280         wil_info(wil, "set ITR_RX_CNT_TRSH = %d usec\n",
 281                  wil->rx_max_burst_duration);
 282         /* Configure TX max burst duration timer to use usec units */
 283         wil_w(wil, RGF_DMA_ITR_RX_CNT_CTL,
 284               BIT_DMA_ITR_RX_CNT_CTL_EN | BIT_DMA_ITR_RX_CNT_CTL_EXT_TIC_SEL);
 285
 286         /* Disable and clear rx idle counter before (re)configuration */
 287         wil_w(wil, RGF_DMA_ITR_RX_IDL_CNT_CTL, BIT_DMA_ITR_RX_IDL_CNT_CTL_CLR);
 288         wil_w(wil, RGF_DMA_ITR_RX_IDL_CNT_TRSH, wil->rx_interframe_timeout);
 289         wil_info(wil, "set ITR_RX_IDL_CNT_TRSH = %d usec\n",
 290                  wil->rx_interframe_timeout);
 291         /* Configure TX max burst duration timer to use usec units */
 292         wil_w(wil, RGF_DMA_ITR_RX_IDL_CNT_CTL, BIT_DMA_ITR_RX_IDL_CNT_CTL_EN |
 293               BIT_DMA_ITR_RX_IDL_CNT_CTL_EXT_TIC_SEL);
 294 }
 295
 296 static irqreturn_t wil6210_irq_rx(int irq, void *cookie)
 297 {
 298         struct wil6210_priv *wil = cookie;
 299         u32 isr;
 300         bool need_unmask = true;
 301
 302         wil6210_mask_irq_rx(wil);
 303
 304         isr = wil_ioread32_and_clear(wil->csr +
 305                                      HOSTADDR(RGF_DMA_EP_RX_ICR) +
 306                                      offsetof(struct RGF_ICR, ICR));
 307
 308         trace_wil6210_irq_rx(isr);
 309         wil_dbg_irq(wil, "ISR RX 0x%08x\n", isr);
 310
 311         if (unlikely(!isr)) {
 312                 wil_err_ratelimited(wil, "spurious IRQ: RX\n");
 313                 wil6210_unmask_irq_rx(wil);
 314                 return IRQ_NONE;
 315         }
 316
 317         /* RX_DONE and RX_HTRSH interrupts are the same if interrupt
 318          * moderation is not used. Interrupt moderation may cause RX
 319          * buffer overflow while RX_DONE is delayed. The required
 320          * action is always the same - should empty the accumulated
 321          * packets from the RX ring.
 322          */
 323         if (likely(isr & (BIT_DMA_EP_RX_ICR_RX_DONE |
 324                           BIT_DMA_EP_RX_ICR_RX_HTRSH))) {
 325                 wil_dbg_irq(wil, "RX done / RX_HTRSH received, ISR (0x%x)\n",
 326                             isr);
 327
 328                 isr &= ~(BIT_DMA_EP_RX_ICR_RX_DONE |
 329                          BIT_DMA_EP_RX_ICR_RX_HTRSH);
 330                 if (likely(test_bit(wil_status_fwready, wil->status))) {
 331                         if (likely(test_bit(wil_status_napi_en, wil->status))) {
 332                                 wil_dbg_txrx(wil, "NAPI(Rx) schedule\n");
 333                                 need_unmask = false;
 334                                 napi_schedule(&wil->napi_rx);
 335                         } else {
 336                                 wil_err_ratelimited(
 337                                         wil,
 338                                         "Got Rx interrupt while stopping interface\n");
 339                         }
 340                 } else {
 341                         wil_err_ratelimited(wil, "Got Rx interrupt while in reset\n");
 342                 }
 343         }
 344
 345         if (unlikely(isr))
 346                 wil_err(wil, "un-handled RX ISR bits 0x%08x\n", isr);
 347
 348         /* Rx IRQ will be enabled when NAPI processing finished */
 349
 350         atomic_inc(&wil->isr_count_rx);
 351
 352         if (unlikely(need_unmask))
 353                 wil6210_unmask_irq_rx(wil);
 354
 355         return IRQ_HANDLED;
 356 }
 357
 358 static irqreturn_t wil6210_irq_rx_edma(int irq, void *cookie)
 359 {
 360         struct wil6210_priv *wil = cookie;
 361         u32 isr;
 362         bool need_unmask = true;
 363
 364         wil6210_mask_irq_rx_edma(wil);
 365
 366         isr = wil_ioread32_and_clear(wil->csr +
 367                                      HOSTADDR(RGF_INT_GEN_RX_ICR) +
 368                                      offsetof(struct RGF_ICR, ICR));
 369
 370         trace_wil6210_irq_rx(isr);
 371         wil_dbg_irq(wil, "ISR RX 0x%08x\n", isr);
 372
 373         if (unlikely(!isr)) {
 374                 wil_err(wil, "spurious IRQ: RX\n");
 375                 wil6210_unmask_irq_rx_edma(wil);
 376                 return IRQ_NONE;
 377         }
 378
 379         if (likely(isr & BIT_RX_STATUS_IRQ)) {
 380                 wil_dbg_irq(wil, "RX status ring\n");
 381                 isr &= ~BIT_RX_STATUS_IRQ;
 382                 if (likely(test_bit(wil_status_fwready, wil->status))) {
 383                         if (likely(test_bit(wil_status_napi_en, wil->status))) {
 384                                 wil_dbg_txrx(wil, "NAPI(Rx) schedule\n");
 385                                 need_unmask = false;
 386                                 napi_schedule(&wil->napi_rx);
 387                         } else {
 388                                 wil_err(wil,
 389                                         "Got Rx interrupt while stopping interface\n");
 390                         }
 391                 } else {
 392                         wil_err(wil, "Got Rx interrupt while in reset\n");
 393                 }
 394         }
 395
 396         if (unlikely(isr))
 397                 wil_err(wil, "un-handled RX ISR bits 0x%08x\n", isr);
 398
 399         /* Rx IRQ will be enabled when NAPI processing finished */
 400
 401         atomic_inc(&wil->isr_count_rx);
 402
 403         if (unlikely(need_unmask))
 404                 wil6210_unmask_irq_rx_edma(wil);
 405
 406         return IRQ_HANDLED;
 407 }
 408
 409 static irqreturn_t wil6210_irq_tx_edma(int irq, void *cookie)
 410 {
 411         struct wil6210_priv *wil = cookie;
 412         u32 isr;
 413         bool need_unmask = true;
 414
 415         wil6210_mask_irq_tx_edma(wil);
 416
 417         isr = wil_ioread32_and_clear(wil->csr +
 418                                      HOSTADDR(RGF_INT_GEN_TX_ICR) +
 419                                      offsetof(struct RGF_ICR, ICR));
 420
 421         trace_wil6210_irq_tx(isr);
 422         wil_dbg_irq(wil, "ISR TX 0x%08x\n", isr);
 423
 424         if (unlikely(!isr)) {
 425                 wil_err(wil, "spurious IRQ: TX\n");
 426                 wil6210_unmask_irq_tx_edma(wil);
 427                 return IRQ_NONE;
 428         }
 429
 430         if (likely(isr & BIT_TX_STATUS_IRQ)) {
 431                 wil_dbg_irq(wil, "TX status ring\n");
 432                 isr &= ~BIT_TX_STATUS_IRQ;
 433                 if (likely(test_bit(wil_status_fwready, wil->status))) {
 434                         wil_dbg_txrx(wil, "NAPI(Tx) schedule\n");
 435                         need_unmask = false;
 436                         napi_schedule(&wil->napi_tx);
 437                 } else {
 438                         wil_err(wil, "Got Tx status ring IRQ while in reset\n");
 439                 }
 440         }
 441
 442         if (unlikely(isr))
 443                 wil_err(wil, "un-handled TX ISR bits 0x%08x\n", isr);
 444
 445         /* Tx IRQ will be enabled when NAPI processing finished */
 446
 447         atomic_inc(&wil->isr_count_tx);
 448
 449         if (unlikely(need_unmask))
 450                 wil6210_unmask_irq_tx_edma(wil);
 451
 452         return IRQ_HANDLED;
 453 }
 454
 455 static irqreturn_t wil6210_irq_tx(int irq, void *cookie)
 456 {
 457         struct wil6210_priv *wil = cookie;
 458         u32 isr;
 459         bool need_unmask = true;
 460
 461         wil6210_mask_irq_tx(wil);
 462
 463         isr = wil_ioread32_and_clear(wil->csr +
 464                                      HOSTADDR(RGF_DMA_EP_TX_ICR) +
 465                                      offsetof(struct RGF_ICR, ICR));
 466
 467         trace_wil6210_irq_tx(isr);
 468         wil_dbg_irq(wil, "ISR TX 0x%08x\n", isr);
 469
 470         if (unlikely(!isr)) {
 471                 wil_err_ratelimited(wil, "spurious IRQ: TX\n");
 472                 wil6210_unmask_irq_tx(wil);
 473                 return IRQ_NONE;
 474         }
 475
 476         if (likely(isr & BIT_DMA_EP_TX_ICR_TX_DONE)) {
 477                 wil_dbg_irq(wil, "TX done\n");
 478                 isr &= ~BIT_DMA_EP_TX_ICR_TX_DONE;
 479                 /* clear also all VRING interrupts */
 480                 isr &= ~(BIT(25) - 1UL);
 481                 if (likely(test_bit(wil_status_fwready, wil->status))) {
 482                         wil_dbg_txrx(wil, "NAPI(Tx) schedule\n");
 483                         need_unmask = false;
 484                         napi_schedule(&wil->napi_tx);
 485                 } else {
 486                         wil_err_ratelimited(wil, "Got Tx interrupt while in reset\n");
 487                 }
 488         }
 489
 490         if (unlikely(isr))
 491                 wil_err_ratelimited(wil, "un-handled TX ISR bits 0x%08x\n",
 492                                     isr);
 493
 494         /* Tx IRQ will be enabled when NAPI processing finished */
 495
 496         atomic_inc(&wil->isr_count_tx);
 497
 498         if (unlikely(need_unmask))
 499                 wil6210_unmask_irq_tx(wil);
 500
 501         return IRQ_HANDLED;
 502 }
 503
 504 static void wil_notify_fw_error(struct wil6210_priv *wil)
 505 {
 506         struct device *dev = &wil->main_ndev->dev;
 507         char *envp[3] = {
 508                 [0] = "SOURCE=wil6210",
 509                 [1] = "EVENT=FW_ERROR",
 510                 [2] = NULL,
 511         };
 512         wil_err(wil, "Notify about firmware error\n");
 513         kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp);
 514 }
 515
 516 static void wil_cache_mbox_regs(struct wil6210_priv *wil)
 517 {
 518         /* make shadow copy of registers that should not change on run time */
 519         wil_memcpy_fromio_32(&wil->mbox_ctl, wil->csr + HOST_MBOX,
 520                              sizeof(struct wil6210_mbox_ctl));
 521         wil_mbox_ring_le2cpus(&wil->mbox_ctl.rx);
 522         wil_mbox_ring_le2cpus(&wil->mbox_ctl.tx);
 523 }
 524
 525 static bool wil_validate_mbox_regs(struct wil6210_priv *wil)
 526 {
 527         size_t min_size = sizeof(struct wil6210_mbox_hdr) +
 528                 sizeof(struct wmi_cmd_hdr);
 529
 530         if (wil->mbox_ctl.rx.entry_size < min_size) {
 531                 wil_err(wil, "rx mbox entry too small (%d)\n",
 532                         wil->mbox_ctl.rx.entry_size);
 533                 return false;
 534         }
 535         if (wil->mbox_ctl.tx.entry_size < min_size) {
 536                 wil_err(wil, "tx mbox entry too small (%d)\n",
 537                         wil->mbox_ctl.tx.entry_size);
 538                 return false;
 539         }
 540
 541         return true;
 542 }
 543
 544 static irqreturn_t wil6210_irq_misc(int irq, void *cookie)
 545 {
 546         struct wil6210_priv *wil = cookie;
 547         u32 isr;
 548
 549         wil6210_mask_irq_misc(wil, false);
 550
 551         isr = wil_ioread32_and_clear(wil->csr +
 552                                      HOSTADDR(RGF_DMA_EP_MISC_ICR) +
 553                                      offsetof(struct RGF_ICR, ICR));
 554
 555         trace_wil6210_irq_misc(isr);
 556         wil_dbg_irq(wil, "ISR MISC 0x%08x\n", isr);
 557
 558         if (!isr) {
 559                 wil_err(wil, "spurious IRQ: MISC\n");
 560                 wil6210_unmask_irq_misc(wil, false);
 561                 return IRQ_NONE;
 562         }
 563
 564         if (isr & ISR_MISC_FW_ERROR) {
 565                 u32 fw_assert_code = wil_r(wil, wil->rgf_fw_assert_code_addr);
 566                 u32 ucode_assert_code =
 567                         wil_r(wil, wil->rgf_ucode_assert_code_addr);
 568
 569                 wil_err(wil,
 570                         "Firmware error detected, assert codes FW 0x%08x, UCODE 0x%08x\n",
 571                         fw_assert_code, ucode_assert_code);
 572                 clear_bit(wil_status_fwready, wil->status);
 573                 /*
 574                  * do not clear @isr here - we do 2-nd part in thread
 575                  * there, user space get notified, and it should be done
 576                  * in non-atomic context
 577                  */
 578         }
 579
 580         if (isr & ISR_MISC_FW_READY) {
 581                 wil_dbg_irq(wil, "IRQ: FW ready\n");
 582                 wil_cache_mbox_regs(wil);
 583                 if (wil_validate_mbox_regs(wil))
 584                         set_bit(wil_status_mbox_ready, wil->status);
 585                 /**
 586                  * Actual FW ready indicated by the
 587                  * WMI_FW_READY_EVENTID
 588                  */
 589                 isr &= ~ISR_MISC_FW_READY;
 590         }
 591
 592         if (isr & BIT_DMA_EP_MISC_ICR_HALP) {
 593                 isr &= ~BIT_DMA_EP_MISC_ICR_HALP;
 594                 if (wil->halp.handle_icr) {
 595                         /* no need to handle HALP ICRs until next vote */
 596                         wil->halp.handle_icr = false;
 597                         wil_dbg_irq(wil, "irq_misc: HALP IRQ invoked\n");
 598                         wil6210_mask_halp(wil);
 599                         complete(&wil->halp.comp);
 600                 }
 601         }
 602
 603         wil->isr_misc = isr;
 604
 605         if (isr) {
 606                 return IRQ_WAKE_THREAD;
 607         } else {
 608                 wil6210_unmask_irq_misc(wil, false);
 609                 return IRQ_HANDLED;
 610         }
 611 }
 612
 613 static irqreturn_t wil6210_irq_misc_thread(int irq, void *cookie)
 614 {
 615         struct wil6210_priv *wil = cookie;
 616         u32 isr = wil->isr_misc;
 617
 618         trace_wil6210_irq_misc_thread(isr);
 619         wil_dbg_irq(wil, "Thread ISR MISC 0x%08x\n", isr);
 620
 621         if (isr & ISR_MISC_FW_ERROR) {
 622                 wil->recovery_state = fw_recovery_pending;
 623                 wil_fw_core_dump(wil);
 624                 wil_notify_fw_error(wil);
 625                 isr &= ~ISR_MISC_FW_ERROR;
 626                 if (wil->platform_ops.notify) {
 627                         wil_err(wil, "notify platform driver about FW crash");
 628                         wil->platform_ops.notify(wil->platform_handle,
 629                                                  WIL_PLATFORM_EVT_FW_CRASH);
 630                 } else {
 631                         wil_fw_error_recovery(wil);
 632                 }
 633         }
 634         if (isr & ISR_MISC_MBOX_EVT) {
 635                 wil_dbg_irq(wil, "MBOX event\n");
 636                 wmi_recv_cmd(wil);
 637                 isr &= ~ISR_MISC_MBOX_EVT;
 638         }
 639
 640         if (isr)
 641                 wil_dbg_irq(wil, "un-handled MISC ISR bits 0x%08x\n", isr);
 642
 643         wil->isr_misc = 0;
 644
 645         wil6210_unmask_irq_misc(wil, false);
 646
 647         /* in non-triple MSI case, this is done inside wil6210_thread_irq
 648          * because it has to be done after unmasking the pseudo.
 649          */
 650         if (wil->n_msi == 3 && wil->suspend_resp_rcvd) {
 651                 wil_dbg_irq(wil, "set suspend_resp_comp to true\n");
 652                 wil->suspend_resp_comp = true;
 653                 wake_up_interruptible(&wil->wq);
 654         }
 655
 656         return IRQ_HANDLED;
 657 }
 658
 659 /**
 660  * thread IRQ handler
 661  */
 662 static irqreturn_t wil6210_thread_irq(int irq, void *cookie)
 663 {
 664         struct wil6210_priv *wil = cookie;
 665
 666         wil_dbg_irq(wil, "Thread IRQ\n");
 667         /* Discover real IRQ cause */
 668         if (wil->isr_misc)
 669                 wil6210_irq_misc_thread(irq, cookie);
 670
 671         wil6210_unmask_irq_pseudo(wil);
 672
 673         if (wil->suspend_resp_rcvd) {
 674                 wil_dbg_irq(wil, "set suspend_resp_comp to true\n");
 675                 wil->suspend_resp_comp = true;
 676                 wake_up_interruptible(&wil->wq);
 677         }
 678
 679         return IRQ_HANDLED;
 680 }
 681
 682 /* DEBUG
 683  * There is subtle bug in hardware that causes IRQ to raise when it should be
 684  * masked. It is quite rare and hard to debug.
 685  *
 686  * Catch irq issue if it happens and print all I can.
 687  */
 688 static int wil6210_debug_irq_mask(struct wil6210_priv *wil, u32 pseudo_cause)
 689 {
 690         u32 icm_rx, icr_rx, imv_rx;
 691         u32 icm_tx, icr_tx, imv_tx;
 692         u32 icm_misc, icr_misc, imv_misc;
 693
 694         if (!test_bit(wil_status_irqen, wil->status)) {
 695                 if (wil->use_enhanced_dma_hw) {
 696                         icm_rx = wil_ioread32_and_clear(wil->csr +
 697                                         HOSTADDR(RGF_INT_GEN_RX_ICR) +
 698                                         offsetof(struct RGF_ICR, ICM));
 699                         icr_rx = wil_ioread32_and_clear(wil->csr +
 700                                         HOSTADDR(RGF_INT_GEN_RX_ICR) +
 701                                         offsetof(struct RGF_ICR, ICR));
 702                         imv_rx = wil_r(wil, RGF_INT_GEN_RX_ICR +
 703                                    offsetof(struct RGF_ICR, IMV));
 704                         icm_tx = wil_ioread32_and_clear(wil->csr +
 705                                         HOSTADDR(RGF_INT_GEN_TX_ICR) +
 706                                         offsetof(struct RGF_ICR, ICM));
 707                         icr_tx = wil_ioread32_and_clear(wil->csr +
 708                                         HOSTADDR(RGF_INT_GEN_TX_ICR) +
 709                                         offsetof(struct RGF_ICR, ICR));
 710                         imv_tx = wil_r(wil, RGF_INT_GEN_TX_ICR +
 711                                            offsetof(struct RGF_ICR, IMV));
 712                 } else {
 713                         icm_rx = wil_ioread32_and_clear(wil->csr +
 714                                         HOSTADDR(RGF_DMA_EP_RX_ICR) +
 715                                         offsetof(struct RGF_ICR, ICM));
 716                         icr_rx = wil_ioread32_and_clear(wil->csr +
 717                                         HOSTADDR(RGF_DMA_EP_RX_ICR) +
 718                                         offsetof(struct RGF_ICR, ICR));
 719                         imv_rx = wil_r(wil, RGF_DMA_EP_RX_ICR +
 720                                    offsetof(struct RGF_ICR, IMV));
 721                         icm_tx = wil_ioread32_and_clear(wil->csr +
 722                                         HOSTADDR(RGF_DMA_EP_TX_ICR) +
 723                                         offsetof(struct RGF_ICR, ICM));
 724                         icr_tx = wil_ioread32_and_clear(wil->csr +
 725                                         HOSTADDR(RGF_DMA_EP_TX_ICR) +
 726                                         offsetof(struct RGF_ICR, ICR));
 727                         imv_tx = wil_r(wil, RGF_DMA_EP_TX_ICR +
 728                                            offsetof(struct RGF_ICR, IMV));
 729                 }
 730                 icm_misc = wil_ioread32_and_clear(wil->csr +
 731                                 HOSTADDR(RGF_DMA_EP_MISC_ICR) +
 732                                 offsetof(struct RGF_ICR, ICM));
 733                 icr_misc = wil_ioread32_and_clear(wil->csr +
 734                                 HOSTADDR(RGF_DMA_EP_MISC_ICR) +
 735                                 offsetof(struct RGF_ICR, ICR));
 736                 imv_misc = wil_r(wil, RGF_DMA_EP_MISC_ICR +
 737                                      offsetof(struct RGF_ICR, IMV));
 738
 739                 /* HALP interrupt can be unmasked when misc interrupts are
 740                  * masked
 741                  */
 742                 if (icr_misc & BIT_DMA_EP_MISC_ICR_HALP)
 743                         return 0;
 744
 745                 wil_err(wil, "IRQ when it should be masked: pseudo 0x%08x\n"
 746                                 "Rx   icm:icr:imv 0x%08x 0x%08x 0x%08x\n"
 747                                 "Tx   icm:icr:imv 0x%08x 0x%08x 0x%08x\n"
 748                                 "Misc icm:icr:imv 0x%08x 0x%08x 0x%08x\n",
 749                                 pseudo_cause,
 750                                 icm_rx, icr_rx, imv_rx,
 751                                 icm_tx, icr_tx, imv_tx,
 752                                 icm_misc, icr_misc, imv_misc);
 753
 754                 return -EINVAL;
 755         }
 756
 757         return 0;
 758 }
 759
 760 static irqreturn_t wil6210_hardirq(int irq, void *cookie)
 761 {
 762         irqreturn_t rc = IRQ_HANDLED;
 763         struct wil6210_priv *wil = cookie;
 764         u32 pseudo_cause = wil_r(wil, RGF_DMA_PSEUDO_CAUSE);
 765
 766         /**
 767          * pseudo_cause is Clear-On-Read, no need to ACK
 768          */
 769         if (unlikely((pseudo_cause == 0) || ((pseudo_cause & 0xff) == 0xff)))
 770                 return IRQ_NONE;
 771
 772         /* IRQ mask debug */
 773         if (unlikely(wil6210_debug_irq_mask(wil, pseudo_cause)))
 774                 return IRQ_NONE;
 775
 776         trace_wil6210_irq_pseudo(pseudo_cause);
 777         wil_dbg_irq(wil, "Pseudo IRQ 0x%08x\n", pseudo_cause);
 778
 779         wil6210_mask_irq_pseudo(wil);
 780
 781         /* Discover real IRQ cause
 782          * There are 2 possible phases for every IRQ:
 783          * - hard IRQ handler called right here
 784          * - threaded handler called later
 785          *
 786          * Hard IRQ handler reads and clears ISR.
 787          *
 788          * If threaded handler requested, hard IRQ handler
 789          * returns IRQ_WAKE_THREAD and saves ISR register value
 790          * for the threaded handler use.
 791          *
 792          * voting for wake thread - need at least 1 vote
 793          */
 794         if ((pseudo_cause & BIT_DMA_PSEUDO_CAUSE_RX) &&
 795             (wil->txrx_ops.irq_rx(irq, cookie) == IRQ_WAKE_THREAD))
 796                 rc = IRQ_WAKE_THREAD;
 797
 798         if ((pseudo_cause & BIT_DMA_PSEUDO_CAUSE_TX) &&
 799             (wil->txrx_ops.irq_tx(irq, cookie) == IRQ_WAKE_THREAD))
 800                 rc = IRQ_WAKE_THREAD;
 801
 802         if ((pseudo_cause & BIT_DMA_PSEUDO_CAUSE_MISC) &&
 803             (wil6210_irq_misc(irq, cookie) == IRQ_WAKE_THREAD))
 804                 rc = IRQ_WAKE_THREAD;
 805
 806         /* if thread is requested, it will unmask IRQ */
 807         if (rc != IRQ_WAKE_THREAD)
 808                 wil6210_unmask_irq_pseudo(wil);
 809
 810         return rc;
 811 }
 812
 813 static int wil6210_request_3msi(struct wil6210_priv *wil, int irq)
 814 {
 815         int rc;
 816
 817         /* IRQ's are in the following order:
 818          * - Tx
 819          * - Rx
 820          * - Misc
 821          */
 822         rc = request_irq(irq, wil->txrx_ops.irq_tx, IRQF_SHARED,
 823                          WIL_NAME "_tx", wil);
 824         if (rc)
 825                 return rc;
 826
 827         rc = request_irq(irq + 1, wil->txrx_ops.irq_rx, IRQF_SHARED,
 828                          WIL_NAME "_rx", wil);
 829         if (rc)
 830                 goto free0;
 831
 832         rc = request_threaded_irq(irq + 2, wil6210_irq_misc,
 833                                   wil6210_irq_misc_thread,
 834                                   IRQF_SHARED, WIL_NAME "_misc", wil);
 835         if (rc)
 836                 goto free1;
 837
 838         return 0;
 839 free1:
 840         free_irq(irq + 1, wil);
 841 free0:
 842         free_irq(irq, wil);
 843
 844         return rc;
 845 }
 846
 847 /* can't use wil_ioread32_and_clear because ICC value is not set yet */
 848 static inline void wil_clear32(void __iomem *addr)
 849 {
 850         u32 x = readl(addr);
 851
 852         writel(x, addr);
 853 }
 854
 855 void wil6210_clear_irq(struct wil6210_priv *wil)
 856 {
 857         wil_clear32(wil->csr + HOSTADDR(RGF_DMA_EP_RX_ICR) +
 858                     offsetof(struct RGF_ICR, ICR));
 859         wil_clear32(wil->csr + HOSTADDR(RGF_DMA_EP_TX_ICR) +
 860                     offsetof(struct RGF_ICR, ICR));
 861         wil_clear32(wil->csr + HOSTADDR(RGF_INT_GEN_RX_ICR) +
 862                     offsetof(struct RGF_ICR, ICR));
 863         wil_clear32(wil->csr + HOSTADDR(RGF_INT_GEN_TX_ICR) +
 864                     offsetof(struct RGF_ICR, ICR));
 865         wil_clear32(wil->csr + HOSTADDR(RGF_DMA_EP_MISC_ICR) +
 866                     offsetof(struct RGF_ICR, ICR));
 867         wmb(); /* make sure write completed */
 868 }
 869
 870 void wil6210_set_halp(struct wil6210_priv *wil)
 871 {
 872         wil_dbg_irq(wil, "set_halp\n");
 873
 874         wil_w(wil, RGF_DMA_EP_MISC_ICR + offsetof(struct RGF_ICR, ICS),
 875               BIT_DMA_EP_MISC_ICR_HALP);
 876 }
 877
 878 void wil6210_clear_halp(struct wil6210_priv *wil)
 879 {
 880         wil_dbg_irq(wil, "clear_halp\n");
 881
 882         wil_w(wil, RGF_DMA_EP_MISC_ICR + offsetof(struct RGF_ICR, ICR),
 883               BIT_DMA_EP_MISC_ICR_HALP);
 884         wil6210_unmask_halp(wil);
 885 }
 886
 887 int wil6210_init_irq(struct wil6210_priv *wil, int irq)
 888 {
 889         int rc;
 890
 891         wil_dbg_misc(wil, "init_irq: %s, n_msi=%d\n",
 892                      wil->n_msi ? "MSI" : "INTx", wil->n_msi);
 893
 894         if (wil->use_enhanced_dma_hw) {
 895                 wil->txrx_ops.irq_tx = wil6210_irq_tx_edma;
 896                 wil->txrx_ops.irq_rx = wil6210_irq_rx_edma;
 897         } else {
 898                 wil->txrx_ops.irq_tx = wil6210_irq_tx;
 899                 wil->txrx_ops.irq_rx = wil6210_irq_rx;
 900         }
 901
 902         if (wil->n_msi == 3)
 903                 rc = wil6210_request_3msi(wil, irq);
 904         else
 905                 rc = request_threaded_irq(irq, wil6210_hardirq,
 906                                           wil6210_thread_irq,
 907                                           wil->n_msi ? 0 : IRQF_SHARED,
 908                                           WIL_NAME, wil);
 909         return rc;
 910 }
 911
 912 void wil6210_fini_irq(struct wil6210_priv *wil, int irq)
 913 {
 914         wil_dbg_misc(wil, "fini_irq:\n");
 915
 916         wil_mask_irq(wil);
 917         free_irq(irq, wil);
 918         if (wil->n_msi == 3) {
 919                 free_irq(irq + 1, wil);
 920                 free_irq(irq + 2, wil);
 921         }
 922 }