drivers/net/wireless/mediatek/mt76/sdio_txrx.c

   1 // SPDX-License-Identifier: ISC
   2 /* Copyright (C) 2020 MediaTek Inc.
   3  *
   4  * Author: Felix Fietkau <nbd@nbd.name>
   5  *         Lorenzo Bianconi <lorenzo@kernel.org>
   6  *         Sean Wang <sean.wang@mediatek.com>
   7  */
   8
   9 #include <linux/kernel.h>
  10 #include <linux/iopoll.h>
  11 #include <linux/module.h>
  12
  13 #include <linux/mmc/host.h>
  14 #include <linux/mmc/sdio_ids.h>
  15 #include <linux/mmc/sdio_func.h>
  16
  17 #include "trace.h"
  18 #include "sdio.h"
  19 #include "mt76.h"
  20
  21 static int mt76s_refill_sched_quota(struct mt76_dev *dev, u32 *data)
  22 {
  23         u32 ple_ac_data_quota[] = {
  24                 FIELD_GET(TXQ_CNT_L, data[4]), /* VO */
  25                 FIELD_GET(TXQ_CNT_H, data[3]), /* VI */
  26                 FIELD_GET(TXQ_CNT_L, data[3]), /* BE */
  27                 FIELD_GET(TXQ_CNT_H, data[2]), /* BK */
  28         };
  29         u32 pse_ac_data_quota[] = {
  30                 FIELD_GET(TXQ_CNT_H, data[1]), /* VO */
  31                 FIELD_GET(TXQ_CNT_L, data[1]), /* VI */
  32                 FIELD_GET(TXQ_CNT_H, data[0]), /* BE */
  33                 FIELD_GET(TXQ_CNT_L, data[0]), /* BK */
  34         };
  35         u32 pse_mcu_quota = FIELD_GET(TXQ_CNT_L, data[2]);
  36         u32 pse_data_quota = 0, ple_data_quota = 0;
  37         struct mt76_sdio *sdio = &dev->sdio;
  38         int i;
  39
  40         for (i = 0; i < ARRAY_SIZE(pse_ac_data_quota); i++) {
  41                 pse_data_quota += pse_ac_data_quota[i];
  42                 ple_data_quota += ple_ac_data_quota[i];
  43         }
  44
  45         if (!pse_data_quota && !ple_data_quota && !pse_mcu_quota)
  46                 return 0;
  47
  48         sdio->sched.pse_mcu_quota += pse_mcu_quota;
  49         sdio->sched.pse_data_quota += pse_data_quota;
  50         sdio->sched.ple_data_quota += ple_data_quota;
  51
  52         return pse_data_quota + ple_data_quota + pse_mcu_quota;
  53 }
  54
  55 static struct sk_buff *
  56 mt76s_build_rx_skb(void *data, int data_len, int buf_len)
  57 {
  58         int len = min_t(int, data_len, MT_SKB_HEAD_LEN);
  59         struct sk_buff *skb;
  60
  61         skb = alloc_skb(len, GFP_KERNEL);
  62         if (!skb)
  63                 return NULL;
  64
  65         skb_put_data(skb, data, len);
  66         if (data_len > len) {
  67                 struct page *page;
  68
  69                 data += len;
  70                 page = virt_to_head_page(data);
  71                 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
  72                                 page, data - page_address(page),
  73                                 data_len - len, buf_len);
  74                 get_page(page);
  75         }
  76
  77         return skb;
  78 }
  79
  80 static int
  81 mt76s_rx_run_queue(struct mt76_dev *dev, enum mt76_rxq_id qid,
  82                    struct mt76s_intr *intr)
  83 {
  84         struct mt76_queue *q = &dev->q_rx[qid];
  85         struct mt76_sdio *sdio = &dev->sdio;
  86         int len = 0, err, i;
  87         struct page *page;
  88         u8 *buf, *end;
  89
  90         for (i = 0; i < intr->rx.num[qid]; i++)
  91                 len += round_up(intr->rx.len[qid][i] + 4, 4);
  92
  93         if (!len)
  94                 return 0;
  95
  96         if (len > sdio->func->cur_blksize)
  97                 len = roundup(len, sdio->func->cur_blksize);
  98
  99         page = __dev_alloc_pages(GFP_KERNEL, get_order(len));
 100         if (!page)
 101                 return -ENOMEM;
 102
 103         buf = page_address(page);
 104
 105         sdio_claim_host(sdio->func);
 106         err = sdio_readsb(sdio->func, buf, MCR_WRDR(qid), len);
 107         sdio_release_host(sdio->func);
 108
 109         if (err < 0) {
 110                 dev_err(dev->dev, "sdio read data failed:%d\n", err);
 111                 put_page(page);
 112                 return err;
 113         }
 114
 115         end = buf + len;
 116         i = 0;
 117
 118         while (i < intr->rx.num[qid] && buf < end) {
 119                 int index = (q->head + i) % q->ndesc;
 120                 struct mt76_queue_entry *e = &q->entry[index];
 121                 __le32 *rxd = (__le32 *)buf;
 122
 123                 /* parse rxd to get the actual packet length */
 124                 len = le32_get_bits(rxd[0], GENMASK(15, 0));
 125
 126                 /* Optimized path for TXS */
 127                 if (!dev->drv->rx_check || dev->drv->rx_check(dev, buf, len)) {
 128                         e->skb = mt76s_build_rx_skb(buf, len,
 129                                                     round_up(len + 4, 4));
 130                         if (!e->skb)
 131                                 break;
 132
 133                         if (q->queued + i + 1 == q->ndesc)
 134                                 break;
 135                         i++;
 136                 }
 137                 buf += round_up(len + 4, 4);
 138         }
 139         put_page(page);
 140
 141         spin_lock_bh(&q->lock);
 142         q->head = (q->head + i) % q->ndesc;
 143         q->queued += i;
 144         spin_unlock_bh(&q->lock);
 145
 146         return i;
 147 }
 148
 149 static int mt76s_rx_handler(struct mt76_dev *dev)
 150 {
 151         struct mt76_sdio *sdio = &dev->sdio;
 152         struct mt76s_intr intr;
 153         int nframes = 0, ret;
 154
 155         ret = sdio->parse_irq(dev, &intr);
 156         if (ret)
 157                 return ret;
 158
 159         trace_dev_irq(dev, intr.isr, 0);
 160
 161         if (intr.isr & WHIER_RX0_DONE_INT_EN) {
 162                 ret = mt76s_rx_run_queue(dev, 0, &intr);
 163                 if (ret > 0) {
 164                         mt76_worker_schedule(&sdio->net_worker);
 165                         nframes += ret;
 166                 }
 167         }
 168
 169         if (intr.isr & WHIER_RX1_DONE_INT_EN) {
 170                 ret = mt76s_rx_run_queue(dev, 1, &intr);
 171                 if (ret > 0) {
 172                         mt76_worker_schedule(&sdio->net_worker);
 173                         nframes += ret;
 174                 }
 175         }
 176
 177         nframes += !!mt76s_refill_sched_quota(dev, intr.tx.wtqcr);
 178
 179         return nframes;
 180 }
 181
 182 static int
 183 mt76s_tx_pick_quota(struct mt76_sdio *sdio, bool mcu, int buf_sz,
 184                     int *pse_size, int *ple_size)
 185 {
 186         int pse_sz;
 187
 188         pse_sz = DIV_ROUND_UP(buf_sz + sdio->sched.deficit,
 189                               sdio->sched.pse_page_size);
 190
 191         if (mcu && sdio->hw_ver == MT76_CONNAC2_SDIO)
 192                 pse_sz = 1;
 193
 194         if (mcu) {
 195                 if (sdio->sched.pse_mcu_quota < *pse_size + pse_sz)
 196                         return -EBUSY;
 197         } else {
 198                 if (sdio->sched.pse_data_quota < *pse_size + pse_sz ||
 199                     sdio->sched.ple_data_quota < *ple_size + 1)
 200                         return -EBUSY;
 201
 202                 *ple_size = *ple_size + 1;
 203         }
 204         *pse_size = *pse_size + pse_sz;
 205
 206         return 0;
 207 }
 208
 209 static void
 210 mt76s_tx_update_quota(struct mt76_sdio *sdio, bool mcu, int pse_size,
 211                       int ple_size)
 212 {
 213         if (mcu) {
 214                 sdio->sched.pse_mcu_quota -= pse_size;
 215         } else {
 216                 sdio->sched.pse_data_quota -= pse_size;
 217                 sdio->sched.ple_data_quota -= ple_size;
 218         }
 219 }
 220
 221 static int __mt76s_xmit_queue(struct mt76_dev *dev, u8 *data, int len)
 222 {
 223         struct mt76_sdio *sdio = &dev->sdio;
 224         int err;
 225
 226         if (len > sdio->func->cur_blksize)
 227                 len = roundup(len, sdio->func->cur_blksize);
 228
 229         sdio_claim_host(sdio->func);
 230         err = sdio_writesb(sdio->func, MCR_WTDR1, data, len);
 231         sdio_release_host(sdio->func);
 232
 233         if (err)
 234                 dev_err(dev->dev, "sdio write failed: %d\n", err);
 235
 236         return err;
 237 }
 238
 239 static int mt76s_tx_run_queue(struct mt76_dev *dev, struct mt76_queue *q)
 240 {
 241         int err, nframes = 0, len = 0, pse_sz = 0, ple_sz = 0;
 242         bool mcu = q == dev->q_mcu[MT_MCUQ_WM];
 243         struct mt76_sdio *sdio = &dev->sdio;
 244         u8 pad;
 245
 246         while (q->first != q->head) {
 247                 struct mt76_queue_entry *e = &q->entry[q->first];
 248                 struct sk_buff *iter;
 249
 250                 smp_rmb();
 251
 252                 if (test_bit(MT76_MCU_RESET, &dev->phy.state))
 253                         goto next;
 254
 255                 if (!test_bit(MT76_STATE_MCU_RUNNING, &dev->phy.state)) {
 256                         __skb_put_zero(e->skb, 4);
 257                         err = __skb_grow(e->skb, roundup(e->skb->len,
 258                                                          sdio->func->cur_blksize));
 259                         if (err)
 260                                 return err;
 261                         err = __mt76s_xmit_queue(dev, e->skb->data,
 262                                                  e->skb->len);
 263                         if (err)
 264                                 return err;
 265
 266                         goto next;
 267                 }
 268
 269                 pad = roundup(e->skb->len, 4) - e->skb->len;
 270                 if (len + e->skb->len + pad + 4 > dev->sdio.xmit_buf_sz)
 271                         break;
 272
 273                 if (mt76s_tx_pick_quota(sdio, mcu, e->buf_sz, &pse_sz,
 274                                         &ple_sz))
 275                         break;
 276
 277                 memcpy(sdio->xmit_buf + len, e->skb->data, skb_headlen(e->skb));
 278                 len += skb_headlen(e->skb);
 279                 nframes++;
 280
 281                 skb_walk_frags(e->skb, iter) {
 282                         memcpy(sdio->xmit_buf + len, iter->data, iter->len);
 283                         len += iter->len;
 284                         nframes++;
 285                 }
 286
 287                 if (unlikely(pad)) {
 288                         memset(sdio->xmit_buf + len, 0, pad);
 289                         len += pad;
 290                 }
 291 next:
 292                 q->first = (q->first + 1) % q->ndesc;
 293                 e->done = true;
 294         }
 295
 296         if (nframes) {
 297                 memset(sdio->xmit_buf + len, 0, 4);
 298                 err = __mt76s_xmit_queue(dev, sdio->xmit_buf, len + 4);
 299                 if (err)
 300                         return err;
 301         }
 302         mt76s_tx_update_quota(sdio, mcu, pse_sz, ple_sz);
 303
 304         mt76_worker_schedule(&sdio->status_worker);
 305
 306         return nframes;
 307 }
 308
 309 void mt76s_txrx_worker(struct mt76_sdio *sdio)
 310 {
 311         struct mt76_dev *dev = container_of(sdio, struct mt76_dev, sdio);
 312         int i, nframes, ret;
 313
 314         /* disable interrupt */
 315         sdio_claim_host(sdio->func);
 316         sdio_writel(sdio->func, WHLPCR_INT_EN_CLR, MCR_WHLPCR, NULL);
 317         sdio_release_host(sdio->func);
 318
 319         do {
 320                 nframes = 0;
 321
 322                 /* tx */
 323                 for (i = 0; i <= MT_TXQ_PSD; i++) {
 324                         ret = mt76s_tx_run_queue(dev, dev->phy.q_tx[i]);
 325                         if (ret > 0)
 326                                 nframes += ret;
 327                 }
 328                 ret = mt76s_tx_run_queue(dev, dev->q_mcu[MT_MCUQ_WM]);
 329                 if (ret > 0)
 330                         nframes += ret;
 331
 332                 /* rx */
 333                 ret = mt76s_rx_handler(dev);
 334                 if (ret > 0)
 335                         nframes += ret;
 336
 337                 if (test_bit(MT76_MCU_RESET, &dev->phy.state) ||
 338                     test_bit(MT76_STATE_SUSPEND, &dev->phy.state)) {
 339                         if (!mt76s_txqs_empty(dev))
 340                                 continue;
 341                         else
 342                                 wake_up(&sdio->wait);
 343                 }
 344         } while (nframes > 0);
 345
 346         /* enable interrupt */
 347         sdio_claim_host(sdio->func);
 348         sdio_writel(sdio->func, WHLPCR_INT_EN_SET, MCR_WHLPCR, NULL);
 349         sdio_release_host(sdio->func);
 350 }
 351 EXPORT_SYMBOL_GPL(mt76s_txrx_worker);
 352
 353 void mt76s_sdio_irq(struct sdio_func *func)
 354 {
 355         struct mt76_dev *dev = sdio_get_drvdata(func);
 356         struct mt76_sdio *sdio = &dev->sdio;
 357
 358         if (!test_bit(MT76_STATE_INITIALIZED, &dev->phy.state) ||
 359             test_bit(MT76_MCU_RESET, &dev->phy.state))
 360                 return;
 361
 362         sdio_writel(sdio->func, WHLPCR_INT_EN_CLR, MCR_WHLPCR, NULL);
 363         mt76_worker_schedule(&sdio->txrx_worker);
 364 }
 365 EXPORT_SYMBOL_GPL(mt76s_sdio_irq);
 366
 367 bool mt76s_txqs_empty(struct mt76_dev *dev)
 368 {
 369         struct mt76_queue *q;
 370         int i;
 371
 372         for (i = 0; i <= MT_TXQ_PSD + 1; i++) {
 373                 if (i <= MT_TXQ_PSD)
 374                         q = dev->phy.q_tx[i];
 375                 else
 376                         q = dev->q_mcu[MT_MCUQ_WM];
 377
 378                 if (q->first != q->head)
 379                         return false;
 380         }
 381
 382         return true;
 383 }
 384 EXPORT_SYMBOL_GPL(mt76s_txqs_empty);