1 // SPDX-License-Identifier: GPL-2.0-only 2 /* Copyright (C) 2022 MediaTek Inc. 3 * 4 * Author: Lorenzo Bianconi <lorenzo@kernel.org> 5 * Sujuan Chen <sujuan.chen@mediatek.com> 6 */ 7 8 #include <linux/kernel.h> 9 #include <linux/dma-mapping.h> 10 #include <linux/interrupt.h> 11 #include <linux/mfd/syscon.h> 12 #include <linux/of.h> 13 #include <linux/of_irq.h> 14 #include <linux/bitfield.h> 15 16 #include "mtk_wed.h" 17 #include "mtk_wed_regs.h" 18 #include "mtk_wed_wo.h" 19 20 static u32 21 mtk_wed_mmio_r32(struct mtk_wed_wo *wo, u32 reg) 22 { 23 u32 val; 24 25 if (regmap_read(wo->mmio.regs, reg, &val)) 26 val = ~0; 27 28 return val; 29 } 30 31 static void 32 mtk_wed_mmio_w32(struct mtk_wed_wo *wo, u32 reg, u32 val) 33 { 34 regmap_write(wo->mmio.regs, reg, val); 35 } 36 37 static u32 38 mtk_wed_wo_get_isr(struct mtk_wed_wo *wo) 39 { 40 u32 val = mtk_wed_mmio_r32(wo, MTK_WED_WO_CCIF_RCHNUM); 41 42 return val & MTK_WED_WO_CCIF_RCHNUM_MASK; 43 } 44 45 static void 46 mtk_wed_wo_set_isr(struct mtk_wed_wo *wo, u32 mask) 47 { 48 mtk_wed_mmio_w32(wo, MTK_WED_WO_CCIF_IRQ0_MASK, mask); 49 } 50 51 static void 52 mtk_wed_wo_set_ack(struct mtk_wed_wo *wo, u32 mask) 53 { 54 mtk_wed_mmio_w32(wo, MTK_WED_WO_CCIF_ACK, mask); 55 } 56 57 static void 58 mtk_wed_wo_set_isr_mask(struct mtk_wed_wo *wo, u32 mask, u32 val, bool set) 59 { 60 unsigned long flags; 61 62 spin_lock_irqsave(&wo->mmio.lock, flags); 63 wo->mmio.irq_mask &= ~mask; 64 wo->mmio.irq_mask |= val; 65 if (set) 66 mtk_wed_wo_set_isr(wo, wo->mmio.irq_mask); 67 spin_unlock_irqrestore(&wo->mmio.lock, flags); 68 } 69 70 static void 71 mtk_wed_wo_irq_enable(struct mtk_wed_wo *wo, u32 mask) 72 { 73 mtk_wed_wo_set_isr_mask(wo, 0, mask, false); 74 tasklet_schedule(&wo->mmio.irq_tasklet); 75 } 76 77 static void 78 mtk_wed_wo_irq_disable(struct mtk_wed_wo *wo, u32 mask) 79 { 80 mtk_wed_wo_set_isr_mask(wo, mask, 0, true); 81 } 82 83 static void 84 mtk_wed_wo_kickout(struct mtk_wed_wo *wo) 85 { 86 mtk_wed_mmio_w32(wo, MTK_WED_WO_CCIF_BUSY, 1 << MTK_WED_WO_TXCH_NUM); 87 mtk_wed_mmio_w32(wo, MTK_WED_WO_CCIF_TCHNUM, MTK_WED_WO_TXCH_NUM); 88 } 89 90 static void 91 mtk_wed_wo_queue_kick(struct mtk_wed_wo *wo, struct mtk_wed_wo_queue *q, 92 u32 val) 93 { 94 wmb(); 95 mtk_wed_mmio_w32(wo, q->regs.cpu_idx, val); 96 } 97 98 static void * 99 mtk_wed_wo_dequeue(struct mtk_wed_wo *wo, struct mtk_wed_wo_queue *q, u32 *len, 100 bool flush) 101 { 102 int buf_len = SKB_WITH_OVERHEAD(q->buf_size); 103 int index = (q->tail + 1) % q->n_desc; 104 struct mtk_wed_wo_queue_entry *entry; 105 struct mtk_wed_wo_queue_desc *desc; 106 void *buf; 107 108 if (!q->queued) 109 return NULL; 110 111 if (flush) 112 q->desc[index].ctrl |= cpu_to_le32(MTK_WED_WO_CTL_DMA_DONE); 113 else if (!(q->desc[index].ctrl & cpu_to_le32(MTK_WED_WO_CTL_DMA_DONE))) 114 return NULL; 115 116 q->tail = index; 117 q->queued--; 118 119 desc = &q->desc[index]; 120 entry = &q->entry[index]; 121 buf = entry->buf; 122 if (len) 123 *len = FIELD_GET(MTK_WED_WO_CTL_SD_LEN0, 124 le32_to_cpu(READ_ONCE(desc->ctrl))); 125 if (buf) 126 dma_unmap_single(wo->hw->dev, entry->addr, buf_len, 127 DMA_FROM_DEVICE); 128 entry->buf = NULL; 129 130 return buf; 131 } 132 133 static int 134 mtk_wed_wo_queue_refill(struct mtk_wed_wo *wo, struct mtk_wed_wo_queue *q, 135 bool rx) 136 { 137 enum dma_data_direction dir = rx ? DMA_FROM_DEVICE : DMA_TO_DEVICE; 138 int n_buf = 0; 139 140 while (q->queued < q->n_desc) { 141 struct mtk_wed_wo_queue_entry *entry; 142 dma_addr_t addr; 143 void *buf; 144 145 buf = page_frag_alloc(&q->cache, q->buf_size, GFP_ATOMIC); 146 if (!buf) 147 break; 148 149 addr = dma_map_single(wo->hw->dev, buf, q->buf_size, dir); 150 if (unlikely(dma_mapping_error(wo->hw->dev, addr))) { 151 skb_free_frag(buf); 152 break; 153 } 154 155 q->head = (q->head + 1) % q->n_desc; 156 entry = &q->entry[q->head]; 157 entry->addr = addr; 158 entry->len = q->buf_size; 159 q->entry[q->head].buf = buf; 160 161 if (rx) { 162 struct mtk_wed_wo_queue_desc *desc = &q->desc[q->head]; 163 u32 ctrl = MTK_WED_WO_CTL_LAST_SEC0 | 164 FIELD_PREP(MTK_WED_WO_CTL_SD_LEN0, 165 entry->len); 166 167 WRITE_ONCE(desc->buf0, cpu_to_le32(addr)); 168 WRITE_ONCE(desc->ctrl, cpu_to_le32(ctrl)); 169 } 170 q->queued++; 171 n_buf++; 172 } 173 174 return n_buf; 175 } 176 177 static void 178 mtk_wed_wo_rx_complete(struct mtk_wed_wo *wo) 179 { 180 mtk_wed_wo_set_ack(wo, MTK_WED_WO_RXCH_INT_MASK); 181 mtk_wed_wo_irq_enable(wo, MTK_WED_WO_RXCH_INT_MASK); 182 } 183 184 static void 185 mtk_wed_wo_rx_run_queue(struct mtk_wed_wo *wo, struct mtk_wed_wo_queue *q) 186 { 187 for (;;) { 188 struct mtk_wed_mcu_hdr *hdr; 189 struct sk_buff *skb; 190 void *data; 191 u32 len; 192 193 data = mtk_wed_wo_dequeue(wo, q, &len, false); 194 if (!data) 195 break; 196 197 skb = build_skb(data, q->buf_size); 198 if (!skb) { 199 skb_free_frag(data); 200 continue; 201 } 202 203 __skb_put(skb, len); 204 if (mtk_wed_mcu_check_msg(wo, skb)) { 205 dev_kfree_skb(skb); 206 continue; 207 } 208 209 hdr = (struct mtk_wed_mcu_hdr *)skb->data; 210 if (hdr->flag & cpu_to_le16(MTK_WED_WARP_CMD_FLAG_RSP)) 211 mtk_wed_mcu_rx_event(wo, skb); 212 else 213 mtk_wed_mcu_rx_unsolicited_event(wo, skb); 214 } 215 216 if (mtk_wed_wo_queue_refill(wo, q, true)) { 217 u32 index = (q->head - 1) % q->n_desc; 218 219 mtk_wed_wo_queue_kick(wo, q, index); 220 } 221 } 222 223 static irqreturn_t 224 mtk_wed_wo_irq_handler(int irq, void *data) 225 { 226 struct mtk_wed_wo *wo = data; 227 228 mtk_wed_wo_set_isr(wo, 0); 229 tasklet_schedule(&wo->mmio.irq_tasklet); 230 231 return IRQ_HANDLED; 232 } 233 234 static void mtk_wed_wo_irq_tasklet(struct tasklet_struct *t) 235 { 236 struct mtk_wed_wo *wo = from_tasklet(wo, t, mmio.irq_tasklet); 237 u32 intr, mask; 238 239 /* disable interrupts */ 240 mtk_wed_wo_set_isr(wo, 0); 241 242 intr = mtk_wed_wo_get_isr(wo); 243 intr &= wo->mmio.irq_mask; 244 mask = intr & (MTK_WED_WO_RXCH_INT_MASK | MTK_WED_WO_EXCEPTION_INT_MASK); 245 mtk_wed_wo_irq_disable(wo, mask); 246 247 if (intr & MTK_WED_WO_RXCH_INT_MASK) { 248 mtk_wed_wo_rx_run_queue(wo, &wo->q_rx); 249 mtk_wed_wo_rx_complete(wo); 250 } 251 } 252 253 /* mtk wed wo hw queues */ 254 255 static int 256 mtk_wed_wo_queue_alloc(struct mtk_wed_wo *wo, struct mtk_wed_wo_queue *q, 257 int n_desc, int buf_size, int index, 258 struct mtk_wed_wo_queue_regs *regs) 259 { 260 q->regs = *regs; 261 q->n_desc = n_desc; 262 q->buf_size = buf_size; 263 264 q->desc = dmam_alloc_coherent(wo->hw->dev, n_desc * sizeof(*q->desc), 265 &q->desc_dma, GFP_KERNEL); 266 if (!q->desc) 267 return -ENOMEM; 268 269 q->entry = devm_kzalloc(wo->hw->dev, n_desc * sizeof(*q->entry), 270 GFP_KERNEL); 271 if (!q->entry) 272 return -ENOMEM; 273 274 return 0; 275 } 276 277 static void 278 mtk_wed_wo_queue_free(struct mtk_wed_wo *wo, struct mtk_wed_wo_queue *q) 279 { 280 mtk_wed_mmio_w32(wo, q->regs.cpu_idx, 0); 281 dma_free_coherent(wo->hw->dev, q->n_desc * sizeof(*q->desc), q->desc, 282 q->desc_dma); 283 } 284 285 static void 286 mtk_wed_wo_queue_tx_clean(struct mtk_wed_wo *wo, struct mtk_wed_wo_queue *q) 287 { 288 struct page *page; 289 int i; 290 291 for (i = 0; i < q->n_desc; i++) { 292 struct mtk_wed_wo_queue_entry *entry = &q->entry[i]; 293 294 dma_unmap_single(wo->hw->dev, entry->addr, entry->len, 295 DMA_TO_DEVICE); 296 skb_free_frag(entry->buf); 297 entry->buf = NULL; 298 } 299 300 if (!q->cache.va) 301 return; 302 303 page = virt_to_page(q->cache.va); 304 __page_frag_cache_drain(page, q->cache.pagecnt_bias); 305 memset(&q->cache, 0, sizeof(q->cache)); 306 } 307 308 static void 309 mtk_wed_wo_queue_rx_clean(struct mtk_wed_wo *wo, struct mtk_wed_wo_queue *q) 310 { 311 struct page *page; 312 313 for (;;) { 314 void *buf = mtk_wed_wo_dequeue(wo, q, NULL, true); 315 316 if (!buf) 317 break; 318 319 skb_free_frag(buf); 320 } 321 322 if (!q->cache.va) 323 return; 324 325 page = virt_to_page(q->cache.va); 326 __page_frag_cache_drain(page, q->cache.pagecnt_bias); 327 memset(&q->cache, 0, sizeof(q->cache)); 328 } 329 330 static void 331 mtk_wed_wo_queue_reset(struct mtk_wed_wo *wo, struct mtk_wed_wo_queue *q) 332 { 333 mtk_wed_mmio_w32(wo, q->regs.cpu_idx, 0); 334 mtk_wed_mmio_w32(wo, q->regs.desc_base, q->desc_dma); 335 mtk_wed_mmio_w32(wo, q->regs.ring_size, q->n_desc); 336 } 337 338 int mtk_wed_wo_queue_tx_skb(struct mtk_wed_wo *wo, struct mtk_wed_wo_queue *q, 339 struct sk_buff *skb) 340 { 341 struct mtk_wed_wo_queue_entry *entry; 342 struct mtk_wed_wo_queue_desc *desc; 343 int ret = 0, index; 344 u32 ctrl; 345 346 q->tail = mtk_wed_mmio_r32(wo, q->regs.dma_idx); 347 index = (q->head + 1) % q->n_desc; 348 if (q->tail == index) { 349 ret = -ENOMEM; 350 goto out; 351 } 352 353 entry = &q->entry[index]; 354 if (skb->len > entry->len) { 355 ret = -ENOMEM; 356 goto out; 357 } 358 359 desc = &q->desc[index]; 360 q->head = index; 361 362 dma_sync_single_for_cpu(wo->hw->dev, entry->addr, skb->len, 363 DMA_TO_DEVICE); 364 memcpy(entry->buf, skb->data, skb->len); 365 dma_sync_single_for_device(wo->hw->dev, entry->addr, skb->len, 366 DMA_TO_DEVICE); 367 368 ctrl = FIELD_PREP(MTK_WED_WO_CTL_SD_LEN0, skb->len) | 369 MTK_WED_WO_CTL_LAST_SEC0 | MTK_WED_WO_CTL_DMA_DONE; 370 WRITE_ONCE(desc->buf0, cpu_to_le32(entry->addr)); 371 WRITE_ONCE(desc->ctrl, cpu_to_le32(ctrl)); 372 373 mtk_wed_wo_queue_kick(wo, q, q->head); 374 mtk_wed_wo_kickout(wo); 375 out: 376 dev_kfree_skb(skb); 377 378 return ret; 379 } 380 381 static int 382 mtk_wed_wo_exception_init(struct mtk_wed_wo *wo) 383 { 384 return 0; 385 } 386 387 static int 388 mtk_wed_wo_hardware_init(struct mtk_wed_wo *wo) 389 { 390 struct mtk_wed_wo_queue_regs regs; 391 struct device_node *np; 392 int ret; 393 394 np = of_parse_phandle(wo->hw->node, "mediatek,wo-ccif", 0); 395 if (!np) 396 return -ENODEV; 397 398 wo->mmio.regs = syscon_regmap_lookup_by_phandle(np, NULL); 399 if (IS_ERR(wo->mmio.regs)) { 400 ret = PTR_ERR(wo->mmio.regs); 401 goto error_put; 402 } 403 404 wo->mmio.irq = irq_of_parse_and_map(np, 0); 405 wo->mmio.irq_mask = MTK_WED_WO_ALL_INT_MASK; 406 spin_lock_init(&wo->mmio.lock); 407 tasklet_setup(&wo->mmio.irq_tasklet, mtk_wed_wo_irq_tasklet); 408 409 ret = devm_request_irq(wo->hw->dev, wo->mmio.irq, 410 mtk_wed_wo_irq_handler, IRQF_TRIGGER_HIGH, 411 KBUILD_MODNAME, wo); 412 if (ret) 413 goto error; 414 415 regs.desc_base = MTK_WED_WO_CCIF_DUMMY1; 416 regs.ring_size = MTK_WED_WO_CCIF_DUMMY2; 417 regs.dma_idx = MTK_WED_WO_CCIF_SHADOW4; 418 regs.cpu_idx = MTK_WED_WO_CCIF_DUMMY3; 419 420 ret = mtk_wed_wo_queue_alloc(wo, &wo->q_tx, MTK_WED_WO_RING_SIZE, 421 MTK_WED_WO_CMD_LEN, MTK_WED_WO_TXCH_NUM, 422 ®s); 423 if (ret) 424 goto error; 425 426 mtk_wed_wo_queue_refill(wo, &wo->q_tx, false); 427 mtk_wed_wo_queue_reset(wo, &wo->q_tx); 428 429 regs.desc_base = MTK_WED_WO_CCIF_DUMMY5; 430 regs.ring_size = MTK_WED_WO_CCIF_DUMMY6; 431 regs.dma_idx = MTK_WED_WO_CCIF_SHADOW8; 432 regs.cpu_idx = MTK_WED_WO_CCIF_DUMMY7; 433 434 ret = mtk_wed_wo_queue_alloc(wo, &wo->q_rx, MTK_WED_WO_RING_SIZE, 435 MTK_WED_WO_CMD_LEN, MTK_WED_WO_RXCH_NUM, 436 ®s); 437 if (ret) 438 goto error; 439 440 mtk_wed_wo_queue_refill(wo, &wo->q_rx, true); 441 mtk_wed_wo_queue_reset(wo, &wo->q_rx); 442 443 /* rx queue irqmask */ 444 mtk_wed_wo_set_isr(wo, wo->mmio.irq_mask); 445 446 return 0; 447 448 error: 449 devm_free_irq(wo->hw->dev, wo->mmio.irq, wo); 450 error_put: 451 of_node_put(np); 452 return ret; 453 } 454 455 static void 456 mtk_wed_wo_hw_deinit(struct mtk_wed_wo *wo) 457 { 458 /* disable interrupts */ 459 mtk_wed_wo_set_isr(wo, 0); 460 461 tasklet_disable(&wo->mmio.irq_tasklet); 462 463 disable_irq(wo->mmio.irq); 464 devm_free_irq(wo->hw->dev, wo->mmio.irq, wo); 465 466 mtk_wed_wo_queue_tx_clean(wo, &wo->q_tx); 467 mtk_wed_wo_queue_rx_clean(wo, &wo->q_rx); 468 mtk_wed_wo_queue_free(wo, &wo->q_tx); 469 mtk_wed_wo_queue_free(wo, &wo->q_rx); 470 } 471 472 int mtk_wed_wo_init(struct mtk_wed_hw *hw) 473 { 474 struct mtk_wed_wo *wo; 475 int ret; 476 477 wo = devm_kzalloc(hw->dev, sizeof(*wo), GFP_KERNEL); 478 if (!wo) 479 return -ENOMEM; 480 481 hw->wed_wo = wo; 482 wo->hw = hw; 483 484 ret = mtk_wed_wo_hardware_init(wo); 485 if (ret) 486 return ret; 487 488 ret = mtk_wed_mcu_init(wo); 489 if (ret) 490 return ret; 491 492 return mtk_wed_wo_exception_init(wo); 493 } 494 495 void mtk_wed_wo_deinit(struct mtk_wed_hw *hw) 496 { 497 struct mtk_wed_wo *wo = hw->wed_wo; 498 499 mtk_wed_wo_hw_deinit(wo); 500 } 501