drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c

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This source file includes following definitions.
axi_dma_iowrite32
axi_dma_ioread32
axi_chan_iowrite32
axi_chan_ioread32
axi_chan_iowrite64
axi_dma_disable
axi_dma_enable
axi_dma_irq_disable
axi_dma_irq_enable
axi_chan_irq_disable
axi_chan_irq_set
axi_chan_irq_sig_set
axi_chan_irq_clear
axi_chan_irq_read
axi_chan_disable
axi_chan_enable
axi_chan_is_hw_enable
axi_dma_hw_init
axi_chan_get_xfer_width
axi_chan_name
axi_desc_get
axi_desc_put
vchan_desc_put
dma_chan_tx_status
write_desc_llp
write_chan_llp
axi_chan_block_xfer_start
axi_chan_start_first_queued
dma_chan_issue_pending
dma_chan_alloc_chan_resources
dma_chan_free_chan_resources
set_desc_last
write_desc_sar
write_desc_dar
set_desc_src_master
set_desc_dest_master
dma_chan_prep_dma_memcpy
axi_chan_dump_lli
axi_chan_list_dump_lli
axi_chan_handle_err
axi_chan_block_xfer_complete
dw_axi_dma_interrupt
dma_chan_terminate_all
dma_chan_pause
axi_chan_resume
dma_chan_resume
axi_dma_suspend
axi_dma_resume
axi_dma_runtime_suspend
axi_dma_runtime_resume
parse_device_properties
dw_probe
dw_remove
   1 // SPDX-License-Identifier:  GPL-2.0
   2 // (C) 2017-2018 Synopsys, Inc. (www.synopsys.com)
   3 
   4 /*
   5  * Synopsys DesignWare AXI DMA Controller driver.
   6  *
   7  * Author: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
   8  */
   9 
  10 #include <linux/bitops.h>
  11 #include <linux/delay.h>
  12 #include <linux/device.h>
  13 #include <linux/dmaengine.h>
  14 #include <linux/dmapool.h>
  15 #include <linux/err.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/io.h>
  18 #include <linux/kernel.h>
  19 #include <linux/module.h>
  20 #include <linux/of.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/pm_runtime.h>
  23 #include <linux/property.h>
  24 #include <linux/types.h>
  25 
  26 #include "dw-axi-dmac.h"
  27 #include "../dmaengine.h"
  28 #include "../virt-dma.h"
  29 
  30 /*
  31  * The set of bus widths supported by the DMA controller. DW AXI DMAC supports
  32  * master data bus width up to 512 bits (for both AXI master interfaces), but
  33  * it depends on IP block configurarion.
  34  */
  35 #define AXI_DMA_BUSWIDTHS                 \
  36         (DMA_SLAVE_BUSWIDTH_1_BYTE      | \
  37         DMA_SLAVE_BUSWIDTH_2_BYTES      | \
  38         DMA_SLAVE_BUSWIDTH_4_BYTES      | \
  39         DMA_SLAVE_BUSWIDTH_8_BYTES      | \
  40         DMA_SLAVE_BUSWIDTH_16_BYTES     | \
  41         DMA_SLAVE_BUSWIDTH_32_BYTES     | \
  42         DMA_SLAVE_BUSWIDTH_64_BYTES)
  43 
  44 static inline void
  45 axi_dma_iowrite32(struct axi_dma_chip *chip, u32 reg, u32 val)
  46 {
  47         iowrite32(val, chip->regs + reg);
  48 }
  49 
  50 static inline u32 axi_dma_ioread32(struct axi_dma_chip *chip, u32 reg)
  51 {
  52         return ioread32(chip->regs + reg);
  53 }
  54 
  55 static inline void
  56 axi_chan_iowrite32(struct axi_dma_chan *chan, u32 reg, u32 val)
  57 {
  58         iowrite32(val, chan->chan_regs + reg);
  59 }
  60 
  61 static inline u32 axi_chan_ioread32(struct axi_dma_chan *chan, u32 reg)
  62 {
  63         return ioread32(chan->chan_regs + reg);
  64 }
  65 
  66 static inline void
  67 axi_chan_iowrite64(struct axi_dma_chan *chan, u32 reg, u64 val)
  68 {
  69         /*
  70          * We split one 64 bit write for two 32 bit write as some HW doesn't
  71          * support 64 bit access.
  72          */
  73         iowrite32(lower_32_bits(val), chan->chan_regs + reg);
  74         iowrite32(upper_32_bits(val), chan->chan_regs + reg + 4);
  75 }
  76 
  77 static inline void axi_dma_disable(struct axi_dma_chip *chip)
  78 {
  79         u32 val;
  80 
  81         val = axi_dma_ioread32(chip, DMAC_CFG);
  82         val &= ~DMAC_EN_MASK;
  83         axi_dma_iowrite32(chip, DMAC_CFG, val);
  84 }
  85 
  86 static inline void axi_dma_enable(struct axi_dma_chip *chip)
  87 {
  88         u32 val;
  89 
  90         val = axi_dma_ioread32(chip, DMAC_CFG);
  91         val |= DMAC_EN_MASK;
  92         axi_dma_iowrite32(chip, DMAC_CFG, val);
  93 }
  94 
  95 static inline void axi_dma_irq_disable(struct axi_dma_chip *chip)
  96 {
  97         u32 val;
  98 
  99         val = axi_dma_ioread32(chip, DMAC_CFG);
 100         val &= ~INT_EN_MASK;
 101         axi_dma_iowrite32(chip, DMAC_CFG, val);
 102 }
 103 
 104 static inline void axi_dma_irq_enable(struct axi_dma_chip *chip)
 105 {
 106         u32 val;
 107 
 108         val = axi_dma_ioread32(chip, DMAC_CFG);
 109         val |= INT_EN_MASK;
 110         axi_dma_iowrite32(chip, DMAC_CFG, val);
 111 }
 112 
 113 static inline void axi_chan_irq_disable(struct axi_dma_chan *chan, u32 irq_mask)
 114 {
 115         u32 val;
 116 
 117         if (likely(irq_mask == DWAXIDMAC_IRQ_ALL)) {
 118                 axi_chan_iowrite32(chan, CH_INTSTATUS_ENA, DWAXIDMAC_IRQ_NONE);
 119         } else {
 120                 val = axi_chan_ioread32(chan, CH_INTSTATUS_ENA);
 121                 val &= ~irq_mask;
 122                 axi_chan_iowrite32(chan, CH_INTSTATUS_ENA, val);
 123         }
 124 }
 125 
 126 static inline void axi_chan_irq_set(struct axi_dma_chan *chan, u32 irq_mask)
 127 {
 128         axi_chan_iowrite32(chan, CH_INTSTATUS_ENA, irq_mask);
 129 }
 130 
 131 static inline void axi_chan_irq_sig_set(struct axi_dma_chan *chan, u32 irq_mask)
 132 {
 133         axi_chan_iowrite32(chan, CH_INTSIGNAL_ENA, irq_mask);
 134 }
 135 
 136 static inline void axi_chan_irq_clear(struct axi_dma_chan *chan, u32 irq_mask)
 137 {
 138         axi_chan_iowrite32(chan, CH_INTCLEAR, irq_mask);
 139 }
 140 
 141 static inline u32 axi_chan_irq_read(struct axi_dma_chan *chan)
 142 {
 143         return axi_chan_ioread32(chan, CH_INTSTATUS);
 144 }
 145 
 146 static inline void axi_chan_disable(struct axi_dma_chan *chan)
 147 {
 148         u32 val;
 149 
 150         val = axi_dma_ioread32(chan->chip, DMAC_CHEN);
 151         val &= ~(BIT(chan->id) << DMAC_CHAN_EN_SHIFT);
 152         val |=   BIT(chan->id) << DMAC_CHAN_EN_WE_SHIFT;
 153         axi_dma_iowrite32(chan->chip, DMAC_CHEN, val);
 154 }
 155 
 156 static inline void axi_chan_enable(struct axi_dma_chan *chan)
 157 {
 158         u32 val;
 159 
 160         val = axi_dma_ioread32(chan->chip, DMAC_CHEN);
 161         val |= BIT(chan->id) << DMAC_CHAN_EN_SHIFT |
 162                BIT(chan->id) << DMAC_CHAN_EN_WE_SHIFT;
 163         axi_dma_iowrite32(chan->chip, DMAC_CHEN, val);
 164 }
 165 
 166 static inline bool axi_chan_is_hw_enable(struct axi_dma_chan *chan)
 167 {
 168         u32 val;
 169 
 170         val = axi_dma_ioread32(chan->chip, DMAC_CHEN);
 171 
 172         return !!(val & (BIT(chan->id) << DMAC_CHAN_EN_SHIFT));
 173 }
 174 
 175 static void axi_dma_hw_init(struct axi_dma_chip *chip)
 176 {
 177         u32 i;
 178 
 179         for (i = 0; i < chip->dw->hdata->nr_channels; i++) {
 180                 axi_chan_irq_disable(&chip->dw->chan[i], DWAXIDMAC_IRQ_ALL);
 181                 axi_chan_disable(&chip->dw->chan[i]);
 182         }
 183 }
 184 
 185 static u32 axi_chan_get_xfer_width(struct axi_dma_chan *chan, dma_addr_t src,
 186                                    dma_addr_t dst, size_t len)
 187 {
 188         u32 max_width = chan->chip->dw->hdata->m_data_width;
 189 
 190         return __ffs(src | dst | len | BIT(max_width));
 191 }
 192 
 193 static inline const char *axi_chan_name(struct axi_dma_chan *chan)
 194 {
 195         return dma_chan_name(&chan->vc.chan);
 196 }
 197 
 198 static struct axi_dma_desc *axi_desc_get(struct axi_dma_chan *chan)
 199 {
 200         struct dw_axi_dma *dw = chan->chip->dw;
 201         struct axi_dma_desc *desc;
 202         dma_addr_t phys;
 203 
 204         desc = dma_pool_zalloc(dw->desc_pool, GFP_NOWAIT, &phys);
 205         if (unlikely(!desc)) {
 206                 dev_err(chan2dev(chan), "%s: not enough descriptors available\n",
 207                         axi_chan_name(chan));
 208                 return NULL;
 209         }
 210 
 211         atomic_inc(&chan->descs_allocated);
 212         INIT_LIST_HEAD(&desc->xfer_list);
 213         desc->vd.tx.phys = phys;
 214         desc->chan = chan;
 215 
 216         return desc;
 217 }
 218 
 219 static void axi_desc_put(struct axi_dma_desc *desc)
 220 {
 221         struct axi_dma_chan *chan = desc->chan;
 222         struct dw_axi_dma *dw = chan->chip->dw;
 223         struct axi_dma_desc *child, *_next;
 224         unsigned int descs_put = 0;
 225 
 226         list_for_each_entry_safe(child, _next, &desc->xfer_list, xfer_list) {
 227                 list_del(&child->xfer_list);
 228                 dma_pool_free(dw->desc_pool, child, child->vd.tx.phys);
 229                 descs_put++;
 230         }
 231 
 232         dma_pool_free(dw->desc_pool, desc, desc->vd.tx.phys);
 233         descs_put++;
 234 
 235         atomic_sub(descs_put, &chan->descs_allocated);
 236         dev_vdbg(chan2dev(chan), "%s: %d descs put, %d still allocated\n",
 237                 axi_chan_name(chan), descs_put,
 238                 atomic_read(&chan->descs_allocated));
 239 }
 240 
 241 static void vchan_desc_put(struct virt_dma_desc *vdesc)
 242 {
 243         axi_desc_put(vd_to_axi_desc(vdesc));
 244 }
 245 
 246 static enum dma_status
 247 dma_chan_tx_status(struct dma_chan *dchan, dma_cookie_t cookie,
 248                   struct dma_tx_state *txstate)
 249 {
 250         struct axi_dma_chan *chan = dchan_to_axi_dma_chan(dchan);
 251         enum dma_status ret;
 252 
 253         ret = dma_cookie_status(dchan, cookie, txstate);
 254 
 255         if (chan->is_paused && ret == DMA_IN_PROGRESS)
 256                 ret = DMA_PAUSED;
 257 
 258         return ret;
 259 }
 260 
 261 static void write_desc_llp(struct axi_dma_desc *desc, dma_addr_t adr)
 262 {
 263         desc->lli.llp = cpu_to_le64(adr);
 264 }
 265 
 266 static void write_chan_llp(struct axi_dma_chan *chan, dma_addr_t adr)
 267 {
 268         axi_chan_iowrite64(chan, CH_LLP, adr);
 269 }
 270 
 271 /* Called in chan locked context */
 272 static void axi_chan_block_xfer_start(struct axi_dma_chan *chan,
 273                                       struct axi_dma_desc *first)
 274 {
 275         u32 priority = chan->chip->dw->hdata->priority[chan->id];
 276         u32 reg, irq_mask;
 277         u8 lms = 0; /* Select AXI0 master for LLI fetching */
 278 
 279         if (unlikely(axi_chan_is_hw_enable(chan))) {
 280                 dev_err(chan2dev(chan), "%s is non-idle!\n",
 281                         axi_chan_name(chan));
 282 
 283                 return;
 284         }
 285 
 286         axi_dma_enable(chan->chip);
 287 
 288         reg = (DWAXIDMAC_MBLK_TYPE_LL << CH_CFG_L_DST_MULTBLK_TYPE_POS |
 289                DWAXIDMAC_MBLK_TYPE_LL << CH_CFG_L_SRC_MULTBLK_TYPE_POS);
 290         axi_chan_iowrite32(chan, CH_CFG_L, reg);
 291 
 292         reg = (DWAXIDMAC_TT_FC_MEM_TO_MEM_DMAC << CH_CFG_H_TT_FC_POS |
 293                priority << CH_CFG_H_PRIORITY_POS |
 294                DWAXIDMAC_HS_SEL_HW << CH_CFG_H_HS_SEL_DST_POS |
 295                DWAXIDMAC_HS_SEL_HW << CH_CFG_H_HS_SEL_SRC_POS);
 296         axi_chan_iowrite32(chan, CH_CFG_H, reg);
 297 
 298         write_chan_llp(chan, first->vd.tx.phys | lms);
 299 
 300         irq_mask = DWAXIDMAC_IRQ_DMA_TRF | DWAXIDMAC_IRQ_ALL_ERR;
 301         axi_chan_irq_sig_set(chan, irq_mask);
 302 
 303         /* Generate 'suspend' status but don't generate interrupt */
 304         irq_mask |= DWAXIDMAC_IRQ_SUSPENDED;
 305         axi_chan_irq_set(chan, irq_mask);
 306 
 307         axi_chan_enable(chan);
 308 }
 309 
 310 static void axi_chan_start_first_queued(struct axi_dma_chan *chan)
 311 {
 312         struct axi_dma_desc *desc;
 313         struct virt_dma_desc *vd;
 314 
 315         vd = vchan_next_desc(&chan->vc);
 316         if (!vd)
 317                 return;
 318 
 319         desc = vd_to_axi_desc(vd);
 320         dev_vdbg(chan2dev(chan), "%s: started %u\n", axi_chan_name(chan),
 321                 vd->tx.cookie);
 322         axi_chan_block_xfer_start(chan, desc);
 323 }
 324 
 325 static void dma_chan_issue_pending(struct dma_chan *dchan)
 326 {
 327         struct axi_dma_chan *chan = dchan_to_axi_dma_chan(dchan);
 328         unsigned long flags;
 329 
 330         spin_lock_irqsave(&chan->vc.lock, flags);
 331         if (vchan_issue_pending(&chan->vc))
 332                 axi_chan_start_first_queued(chan);
 333         spin_unlock_irqrestore(&chan->vc.lock, flags);
 334 }
 335 
 336 static int dma_chan_alloc_chan_resources(struct dma_chan *dchan)
 337 {
 338         struct axi_dma_chan *chan = dchan_to_axi_dma_chan(dchan);
 339 
 340         /* ASSERT: channel is idle */
 341         if (axi_chan_is_hw_enable(chan)) {
 342                 dev_err(chan2dev(chan), "%s is non-idle!\n",
 343                         axi_chan_name(chan));
 344                 return -EBUSY;
 345         }
 346 
 347         dev_vdbg(dchan2dev(dchan), "%s: allocating\n", axi_chan_name(chan));
 348 
 349         pm_runtime_get(chan->chip->dev);
 350 
 351         return 0;
 352 }
 353 
 354 static void dma_chan_free_chan_resources(struct dma_chan *dchan)
 355 {
 356         struct axi_dma_chan *chan = dchan_to_axi_dma_chan(dchan);
 357 
 358         /* ASSERT: channel is idle */
 359         if (axi_chan_is_hw_enable(chan))
 360                 dev_err(dchan2dev(dchan), "%s is non-idle!\n",
 361                         axi_chan_name(chan));
 362 
 363         axi_chan_disable(chan);
 364         axi_chan_irq_disable(chan, DWAXIDMAC_IRQ_ALL);
 365 
 366         vchan_free_chan_resources(&chan->vc);
 367 
 368         dev_vdbg(dchan2dev(dchan),
 369                  "%s: free resources, descriptor still allocated: %u\n",
 370                  axi_chan_name(chan), atomic_read(&chan->descs_allocated));
 371 
 372         pm_runtime_put(chan->chip->dev);
 373 }
 374 
 375 /*
 376  * If DW_axi_dmac sees CHx_CTL.ShadowReg_Or_LLI_Last bit of the fetched LLI
 377  * as 1, it understands that the current block is the final block in the
 378  * transfer and completes the DMA transfer operation at the end of current
 379  * block transfer.
 380  */
 381 static void set_desc_last(struct axi_dma_desc *desc)
 382 {
 383         u32 val;
 384 
 385         val = le32_to_cpu(desc->lli.ctl_hi);
 386         val |= CH_CTL_H_LLI_LAST;
 387         desc->lli.ctl_hi = cpu_to_le32(val);
 388 }
 389 
 390 static void write_desc_sar(struct axi_dma_desc *desc, dma_addr_t adr)
 391 {
 392         desc->lli.sar = cpu_to_le64(adr);
 393 }
 394 
 395 static void write_desc_dar(struct axi_dma_desc *desc, dma_addr_t adr)
 396 {
 397         desc->lli.dar = cpu_to_le64(adr);
 398 }
 399 
 400 static void set_desc_src_master(struct axi_dma_desc *desc)
 401 {
 402         u32 val;
 403 
 404         /* Select AXI0 for source master */
 405         val = le32_to_cpu(desc->lli.ctl_lo);
 406         val &= ~CH_CTL_L_SRC_MAST;
 407         desc->lli.ctl_lo = cpu_to_le32(val);
 408 }
 409 
 410 static void set_desc_dest_master(struct axi_dma_desc *desc)
 411 {
 412         u32 val;
 413 
 414         /* Select AXI1 for source master if available */
 415         val = le32_to_cpu(desc->lli.ctl_lo);
 416         if (desc->chan->chip->dw->hdata->nr_masters > 1)
 417                 val |= CH_CTL_L_DST_MAST;
 418         else
 419                 val &= ~CH_CTL_L_DST_MAST;
 420 
 421         desc->lli.ctl_lo = cpu_to_le32(val);
 422 }
 423 
 424 static struct dma_async_tx_descriptor *
 425 dma_chan_prep_dma_memcpy(struct dma_chan *dchan, dma_addr_t dst_adr,
 426                          dma_addr_t src_adr, size_t len, unsigned long flags)
 427 {
 428         struct axi_dma_desc *first = NULL, *desc = NULL, *prev = NULL;
 429         struct axi_dma_chan *chan = dchan_to_axi_dma_chan(dchan);
 430         size_t block_ts, max_block_ts, xfer_len;
 431         u32 xfer_width, reg;
 432         u8 lms = 0; /* Select AXI0 master for LLI fetching */
 433 
 434         dev_dbg(chan2dev(chan), "%s: memcpy: src: %pad dst: %pad length: %zd flags: %#lx",
 435                 axi_chan_name(chan), &src_adr, &dst_adr, len, flags);
 436 
 437         max_block_ts = chan->chip->dw->hdata->block_size[chan->id];
 438 
 439         while (len) {
 440                 xfer_len = len;
 441 
 442                 /*
 443                  * Take care for the alignment.
 444                  * Actually source and destination widths can be different, but
 445                  * make them same to be simpler.
 446                  */
 447                 xfer_width = axi_chan_get_xfer_width(chan, src_adr, dst_adr, xfer_len);
 448 
 449                 /*
 450                  * block_ts indicates the total number of data of width
 451                  * to be transferred in a DMA block transfer.
 452                  * BLOCK_TS register should be set to block_ts - 1
 453                  */
 454                 block_ts = xfer_len >> xfer_width;
 455                 if (block_ts > max_block_ts) {
 456                         block_ts = max_block_ts;
 457                         xfer_len = max_block_ts << xfer_width;
 458                 }
 459 
 460                 desc = axi_desc_get(chan);
 461                 if (unlikely(!desc))
 462                         goto err_desc_get;
 463 
 464                 write_desc_sar(desc, src_adr);
 465                 write_desc_dar(desc, dst_adr);
 466                 desc->lli.block_ts_lo = cpu_to_le32(block_ts - 1);
 467 
 468                 reg = CH_CTL_H_LLI_VALID;
 469                 if (chan->chip->dw->hdata->restrict_axi_burst_len) {
 470                         u32 burst_len = chan->chip->dw->hdata->axi_rw_burst_len;
 471 
 472                         reg |= (CH_CTL_H_ARLEN_EN |
 473                                 burst_len << CH_CTL_H_ARLEN_POS |
 474                                 CH_CTL_H_AWLEN_EN |
 475                                 burst_len << CH_CTL_H_AWLEN_POS);
 476                 }
 477                 desc->lli.ctl_hi = cpu_to_le32(reg);
 478 
 479                 reg = (DWAXIDMAC_BURST_TRANS_LEN_4 << CH_CTL_L_DST_MSIZE_POS |
 480                        DWAXIDMAC_BURST_TRANS_LEN_4 << CH_CTL_L_SRC_MSIZE_POS |
 481                        xfer_width << CH_CTL_L_DST_WIDTH_POS |
 482                        xfer_width << CH_CTL_L_SRC_WIDTH_POS |
 483                        DWAXIDMAC_CH_CTL_L_INC << CH_CTL_L_DST_INC_POS |
 484                        DWAXIDMAC_CH_CTL_L_INC << CH_CTL_L_SRC_INC_POS);
 485                 desc->lli.ctl_lo = cpu_to_le32(reg);
 486 
 487                 set_desc_src_master(desc);
 488                 set_desc_dest_master(desc);
 489 
 490                 /* Manage transfer list (xfer_list) */
 491                 if (!first) {
 492                         first = desc;
 493                 } else {
 494                         list_add_tail(&desc->xfer_list, &first->xfer_list);
 495                         write_desc_llp(prev, desc->vd.tx.phys | lms);
 496                 }
 497                 prev = desc;
 498 
 499                 /* update the length and addresses for the next loop cycle */
 500                 len -= xfer_len;
 501                 dst_adr += xfer_len;
 502                 src_adr += xfer_len;
 503         }
 504 
 505         /* Total len of src/dest sg == 0, so no descriptor were allocated */
 506         if (unlikely(!first))
 507                 return NULL;
 508 
 509         /* Set end-of-link to the last link descriptor of list */
 510         set_desc_last(desc);
 511 
 512         return vchan_tx_prep(&chan->vc, &first->vd, flags);
 513 
 514 err_desc_get:
 515         if (first)
 516                 axi_desc_put(first);
 517         return NULL;
 518 }
 519 
 520 static void axi_chan_dump_lli(struct axi_dma_chan *chan,
 521                               struct axi_dma_desc *desc)
 522 {
 523         dev_err(dchan2dev(&chan->vc.chan),
 524                 "SAR: 0x%llx DAR: 0x%llx LLP: 0x%llx BTS 0x%x CTL: 0x%x:%08x",
 525                 le64_to_cpu(desc->lli.sar),
 526                 le64_to_cpu(desc->lli.dar),
 527                 le64_to_cpu(desc->lli.llp),
 528                 le32_to_cpu(desc->lli.block_ts_lo),
 529                 le32_to_cpu(desc->lli.ctl_hi),
 530                 le32_to_cpu(desc->lli.ctl_lo));
 531 }
 532 
 533 static void axi_chan_list_dump_lli(struct axi_dma_chan *chan,
 534                                    struct axi_dma_desc *desc_head)
 535 {
 536         struct axi_dma_desc *desc;
 537 
 538         axi_chan_dump_lli(chan, desc_head);
 539         list_for_each_entry(desc, &desc_head->xfer_list, xfer_list)
 540                 axi_chan_dump_lli(chan, desc);
 541 }
 542 
 543 static noinline void axi_chan_handle_err(struct axi_dma_chan *chan, u32 status)
 544 {
 545         struct virt_dma_desc *vd;
 546         unsigned long flags;
 547 
 548         spin_lock_irqsave(&chan->vc.lock, flags);
 549 
 550         axi_chan_disable(chan);
 551 
 552         /* The bad descriptor currently is in the head of vc list */
 553         vd = vchan_next_desc(&chan->vc);
 554         /* Remove the completed descriptor from issued list */
 555         list_del(&vd->node);
 556 
 557         /* WARN about bad descriptor */
 558         dev_err(chan2dev(chan),
 559                 "Bad descriptor submitted for %s, cookie: %d, irq: 0x%08x\n",
 560                 axi_chan_name(chan), vd->tx.cookie, status);
 561         axi_chan_list_dump_lli(chan, vd_to_axi_desc(vd));
 562 
 563         vchan_cookie_complete(vd);
 564 
 565         /* Try to restart the controller */
 566         axi_chan_start_first_queued(chan);
 567 
 568         spin_unlock_irqrestore(&chan->vc.lock, flags);
 569 }
 570 
 571 static void axi_chan_block_xfer_complete(struct axi_dma_chan *chan)
 572 {
 573         struct virt_dma_desc *vd;
 574         unsigned long flags;
 575 
 576         spin_lock_irqsave(&chan->vc.lock, flags);
 577         if (unlikely(axi_chan_is_hw_enable(chan))) {
 578                 dev_err(chan2dev(chan), "BUG: %s caught DWAXIDMAC_IRQ_DMA_TRF, but channel not idle!\n",
 579                         axi_chan_name(chan));
 580                 axi_chan_disable(chan);
 581         }
 582 
 583         /* The completed descriptor currently is in the head of vc list */
 584         vd = vchan_next_desc(&chan->vc);
 585         /* Remove the completed descriptor from issued list before completing */
 586         list_del(&vd->node);
 587         vchan_cookie_complete(vd);
 588 
 589         /* Submit queued descriptors after processing the completed ones */
 590         axi_chan_start_first_queued(chan);
 591 
 592         spin_unlock_irqrestore(&chan->vc.lock, flags);
 593 }
 594 
 595 static irqreturn_t dw_axi_dma_interrupt(int irq, void *dev_id)
 596 {
 597         struct axi_dma_chip *chip = dev_id;
 598         struct dw_axi_dma *dw = chip->dw;
 599         struct axi_dma_chan *chan;
 600 
 601         u32 status, i;
 602 
 603         /* Disable DMAC inerrupts. We'll enable them after processing chanels */
 604         axi_dma_irq_disable(chip);
 605 
 606         /* Poll, clear and process every chanel interrupt status */
 607         for (i = 0; i < dw->hdata->nr_channels; i++) {
 608                 chan = &dw->chan[i];
 609                 status = axi_chan_irq_read(chan);
 610                 axi_chan_irq_clear(chan, status);
 611 
 612                 dev_vdbg(chip->dev, "%s %u IRQ status: 0x%08x\n",
 613                         axi_chan_name(chan), i, status);
 614 
 615                 if (status & DWAXIDMAC_IRQ_ALL_ERR)
 616                         axi_chan_handle_err(chan, status);
 617                 else if (status & DWAXIDMAC_IRQ_DMA_TRF)
 618                         axi_chan_block_xfer_complete(chan);
 619         }
 620 
 621         /* Re-enable interrupts */
 622         axi_dma_irq_enable(chip);
 623 
 624         return IRQ_HANDLED;
 625 }
 626 
 627 static int dma_chan_terminate_all(struct dma_chan *dchan)
 628 {
 629         struct axi_dma_chan *chan = dchan_to_axi_dma_chan(dchan);
 630         unsigned long flags;
 631         LIST_HEAD(head);
 632 
 633         spin_lock_irqsave(&chan->vc.lock, flags);
 634 
 635         axi_chan_disable(chan);
 636 
 637         vchan_get_all_descriptors(&chan->vc, &head);
 638 
 639         /*
 640          * As vchan_dma_desc_free_list can access to desc_allocated list
 641          * we need to call it in vc.lock context.
 642          */
 643         vchan_dma_desc_free_list(&chan->vc, &head);
 644 
 645         spin_unlock_irqrestore(&chan->vc.lock, flags);
 646 
 647         dev_vdbg(dchan2dev(dchan), "terminated: %s\n", axi_chan_name(chan));
 648 
 649         return 0;
 650 }
 651 
 652 static int dma_chan_pause(struct dma_chan *dchan)
 653 {
 654         struct axi_dma_chan *chan = dchan_to_axi_dma_chan(dchan);
 655         unsigned long flags;
 656         unsigned int timeout = 20; /* timeout iterations */
 657         u32 val;
 658 
 659         spin_lock_irqsave(&chan->vc.lock, flags);
 660 
 661         val = axi_dma_ioread32(chan->chip, DMAC_CHEN);
 662         val |= BIT(chan->id) << DMAC_CHAN_SUSP_SHIFT |
 663                BIT(chan->id) << DMAC_CHAN_SUSP_WE_SHIFT;
 664         axi_dma_iowrite32(chan->chip, DMAC_CHEN, val);
 665 
 666         do  {
 667                 if (axi_chan_irq_read(chan) & DWAXIDMAC_IRQ_SUSPENDED)
 668                         break;
 669 
 670                 udelay(2);
 671         } while (--timeout);
 672 
 673         axi_chan_irq_clear(chan, DWAXIDMAC_IRQ_SUSPENDED);
 674 
 675         chan->is_paused = true;
 676 
 677         spin_unlock_irqrestore(&chan->vc.lock, flags);
 678 
 679         return timeout ? 0 : -EAGAIN;
 680 }
 681 
 682 /* Called in chan locked context */
 683 static inline void axi_chan_resume(struct axi_dma_chan *chan)
 684 {
 685         u32 val;
 686 
 687         val = axi_dma_ioread32(chan->chip, DMAC_CHEN);
 688         val &= ~(BIT(chan->id) << DMAC_CHAN_SUSP_SHIFT);
 689         val |=  (BIT(chan->id) << DMAC_CHAN_SUSP_WE_SHIFT);
 690         axi_dma_iowrite32(chan->chip, DMAC_CHEN, val);
 691 
 692         chan->is_paused = false;
 693 }
 694 
 695 static int dma_chan_resume(struct dma_chan *dchan)
 696 {
 697         struct axi_dma_chan *chan = dchan_to_axi_dma_chan(dchan);
 698         unsigned long flags;
 699 
 700         spin_lock_irqsave(&chan->vc.lock, flags);
 701 
 702         if (chan->is_paused)
 703                 axi_chan_resume(chan);
 704 
 705         spin_unlock_irqrestore(&chan->vc.lock, flags);
 706 
 707         return 0;
 708 }
 709 
 710 static int axi_dma_suspend(struct axi_dma_chip *chip)
 711 {
 712         axi_dma_irq_disable(chip);
 713         axi_dma_disable(chip);
 714 
 715         clk_disable_unprepare(chip->core_clk);
 716         clk_disable_unprepare(chip->cfgr_clk);
 717 
 718         return 0;
 719 }
 720 
 721 static int axi_dma_resume(struct axi_dma_chip *chip)
 722 {
 723         int ret;
 724 
 725         ret = clk_prepare_enable(chip->cfgr_clk);
 726         if (ret < 0)
 727                 return ret;
 728 
 729         ret = clk_prepare_enable(chip->core_clk);
 730         if (ret < 0)
 731                 return ret;
 732 
 733         axi_dma_enable(chip);
 734         axi_dma_irq_enable(chip);
 735 
 736         return 0;
 737 }
 738 
 739 static int __maybe_unused axi_dma_runtime_suspend(struct device *dev)
 740 {
 741         struct axi_dma_chip *chip = dev_get_drvdata(dev);
 742 
 743         return axi_dma_suspend(chip);
 744 }
 745 
 746 static int __maybe_unused axi_dma_runtime_resume(struct device *dev)
 747 {
 748         struct axi_dma_chip *chip = dev_get_drvdata(dev);
 749 
 750         return axi_dma_resume(chip);
 751 }
 752 
 753 static int parse_device_properties(struct axi_dma_chip *chip)
 754 {
 755         struct device *dev = chip->dev;
 756         u32 tmp, carr[DMAC_MAX_CHANNELS];
 757         int ret;
 758 
 759         ret = device_property_read_u32(dev, "dma-channels", &tmp);
 760         if (ret)
 761                 return ret;
 762         if (tmp == 0 || tmp > DMAC_MAX_CHANNELS)
 763                 return -EINVAL;
 764 
 765         chip->dw->hdata->nr_channels = tmp;
 766 
 767         ret = device_property_read_u32(dev, "snps,dma-masters", &tmp);
 768         if (ret)
 769                 return ret;
 770         if (tmp == 0 || tmp > DMAC_MAX_MASTERS)
 771                 return -EINVAL;
 772 
 773         chip->dw->hdata->nr_masters = tmp;
 774 
 775         ret = device_property_read_u32(dev, "snps,data-width", &tmp);
 776         if (ret)
 777                 return ret;
 778         if (tmp > DWAXIDMAC_TRANS_WIDTH_MAX)
 779                 return -EINVAL;
 780 
 781         chip->dw->hdata->m_data_width = tmp;
 782 
 783         ret = device_property_read_u32_array(dev, "snps,block-size", carr,
 784                                              chip->dw->hdata->nr_channels);
 785         if (ret)
 786                 return ret;
 787         for (tmp = 0; tmp < chip->dw->hdata->nr_channels; tmp++) {
 788                 if (carr[tmp] == 0 || carr[tmp] > DMAC_MAX_BLK_SIZE)
 789                         return -EINVAL;
 790 
 791                 chip->dw->hdata->block_size[tmp] = carr[tmp];
 792         }
 793 
 794         ret = device_property_read_u32_array(dev, "snps,priority", carr,
 795                                              chip->dw->hdata->nr_channels);
 796         if (ret)
 797                 return ret;
 798         /* Priority value must be programmed within [0:nr_channels-1] range */
 799         for (tmp = 0; tmp < chip->dw->hdata->nr_channels; tmp++) {
 800                 if (carr[tmp] >= chip->dw->hdata->nr_channels)
 801                         return -EINVAL;
 802 
 803                 chip->dw->hdata->priority[tmp] = carr[tmp];
 804         }
 805 
 806         /* axi-max-burst-len is optional property */
 807         ret = device_property_read_u32(dev, "snps,axi-max-burst-len", &tmp);
 808         if (!ret) {
 809                 if (tmp > DWAXIDMAC_ARWLEN_MAX + 1)
 810                         return -EINVAL;
 811                 if (tmp < DWAXIDMAC_ARWLEN_MIN + 1)
 812                         return -EINVAL;
 813 
 814                 chip->dw->hdata->restrict_axi_burst_len = true;
 815                 chip->dw->hdata->axi_rw_burst_len = tmp - 1;
 816         }
 817 
 818         return 0;
 819 }
 820 
 821 static int dw_probe(struct platform_device *pdev)
 822 {
 823         struct axi_dma_chip *chip;
 824         struct resource *mem;
 825         struct dw_axi_dma *dw;
 826         struct dw_axi_dma_hcfg *hdata;
 827         u32 i;
 828         int ret;
 829 
 830         chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL);
 831         if (!chip)
 832                 return -ENOMEM;
 833 
 834         dw = devm_kzalloc(&pdev->dev, sizeof(*dw), GFP_KERNEL);
 835         if (!dw)
 836                 return -ENOMEM;
 837 
 838         hdata = devm_kzalloc(&pdev->dev, sizeof(*hdata), GFP_KERNEL);
 839         if (!hdata)
 840                 return -ENOMEM;
 841 
 842         chip->dw = dw;
 843         chip->dev = &pdev->dev;
 844         chip->dw->hdata = hdata;
 845 
 846         chip->irq = platform_get_irq(pdev, 0);
 847         if (chip->irq < 0)
 848                 return chip->irq;
 849 
 850         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 851         chip->regs = devm_ioremap_resource(chip->dev, mem);
 852         if (IS_ERR(chip->regs))
 853                 return PTR_ERR(chip->regs);
 854 
 855         chip->core_clk = devm_clk_get(chip->dev, "core-clk");
 856         if (IS_ERR(chip->core_clk))
 857                 return PTR_ERR(chip->core_clk);
 858 
 859         chip->cfgr_clk = devm_clk_get(chip->dev, "cfgr-clk");
 860         if (IS_ERR(chip->cfgr_clk))
 861                 return PTR_ERR(chip->cfgr_clk);
 862 
 863         ret = parse_device_properties(chip);
 864         if (ret)
 865                 return ret;
 866 
 867         dw->chan = devm_kcalloc(chip->dev, hdata->nr_channels,
 868                                 sizeof(*dw->chan), GFP_KERNEL);
 869         if (!dw->chan)
 870                 return -ENOMEM;
 871 
 872         ret = devm_request_irq(chip->dev, chip->irq, dw_axi_dma_interrupt,
 873                                IRQF_SHARED, KBUILD_MODNAME, chip);
 874         if (ret)
 875                 return ret;
 876 
 877         /* Lli address must be aligned to a 64-byte boundary */
 878         dw->desc_pool = dmam_pool_create(KBUILD_MODNAME, chip->dev,
 879                                          sizeof(struct axi_dma_desc), 64, 0);
 880         if (!dw->desc_pool) {
 881                 dev_err(chip->dev, "No memory for descriptors dma pool\n");
 882                 return -ENOMEM;
 883         }
 884 
 885         INIT_LIST_HEAD(&dw->dma.channels);
 886         for (i = 0; i < hdata->nr_channels; i++) {
 887                 struct axi_dma_chan *chan = &dw->chan[i];
 888 
 889                 chan->chip = chip;
 890                 chan->id = i;
 891                 chan->chan_regs = chip->regs + COMMON_REG_LEN + i * CHAN_REG_LEN;
 892                 atomic_set(&chan->descs_allocated, 0);
 893 
 894                 chan->vc.desc_free = vchan_desc_put;
 895                 vchan_init(&chan->vc, &dw->dma);
 896         }
 897 
 898         /* Set capabilities */
 899         dma_cap_set(DMA_MEMCPY, dw->dma.cap_mask);
 900 
 901         /* DMA capabilities */
 902         dw->dma.chancnt = hdata->nr_channels;
 903         dw->dma.src_addr_widths = AXI_DMA_BUSWIDTHS;
 904         dw->dma.dst_addr_widths = AXI_DMA_BUSWIDTHS;
 905         dw->dma.directions = BIT(DMA_MEM_TO_MEM);
 906         dw->dma.residue_granularity = DMA_RESIDUE_GRANULARITY_DESCRIPTOR;
 907 
 908         dw->dma.dev = chip->dev;
 909         dw->dma.device_tx_status = dma_chan_tx_status;
 910         dw->dma.device_issue_pending = dma_chan_issue_pending;
 911         dw->dma.device_terminate_all = dma_chan_terminate_all;
 912         dw->dma.device_pause = dma_chan_pause;
 913         dw->dma.device_resume = dma_chan_resume;
 914 
 915         dw->dma.device_alloc_chan_resources = dma_chan_alloc_chan_resources;
 916         dw->dma.device_free_chan_resources = dma_chan_free_chan_resources;
 917 
 918         dw->dma.device_prep_dma_memcpy = dma_chan_prep_dma_memcpy;
 919 
 920         platform_set_drvdata(pdev, chip);
 921 
 922         pm_runtime_enable(chip->dev);
 923 
 924         /*
 925          * We can't just call pm_runtime_get here instead of
 926          * pm_runtime_get_noresume + axi_dma_resume because we need
 927          * driver to work also without Runtime PM.
 928          */
 929         pm_runtime_get_noresume(chip->dev);
 930         ret = axi_dma_resume(chip);
 931         if (ret < 0)
 932                 goto err_pm_disable;
 933 
 934         axi_dma_hw_init(chip);
 935 
 936         pm_runtime_put(chip->dev);
 937 
 938         ret = dmaenginem_async_device_register(&dw->dma);
 939         if (ret)
 940                 goto err_pm_disable;
 941 
 942         dev_info(chip->dev, "DesignWare AXI DMA Controller, %d channels\n",
 943                  dw->hdata->nr_channels);
 944 
 945         return 0;
 946 
 947 err_pm_disable:
 948         pm_runtime_disable(chip->dev);
 949 
 950         return ret;
 951 }
 952 
 953 static int dw_remove(struct platform_device *pdev)
 954 {
 955         struct axi_dma_chip *chip = platform_get_drvdata(pdev);
 956         struct dw_axi_dma *dw = chip->dw;
 957         struct axi_dma_chan *chan, *_chan;
 958         u32 i;
 959 
 960         /* Enable clk before accessing to registers */
 961         clk_prepare_enable(chip->cfgr_clk);
 962         clk_prepare_enable(chip->core_clk);
 963         axi_dma_irq_disable(chip);
 964         for (i = 0; i < dw->hdata->nr_channels; i++) {
 965                 axi_chan_disable(&chip->dw->chan[i]);
 966                 axi_chan_irq_disable(&chip->dw->chan[i], DWAXIDMAC_IRQ_ALL);
 967         }
 968         axi_dma_disable(chip);
 969 
 970         pm_runtime_disable(chip->dev);
 971         axi_dma_suspend(chip);
 972 
 973         devm_free_irq(chip->dev, chip->irq, chip);
 974 
 975         list_for_each_entry_safe(chan, _chan, &dw->dma.channels,
 976                         vc.chan.device_node) {
 977                 list_del(&chan->vc.chan.device_node);
 978                 tasklet_kill(&chan->vc.task);
 979         }
 980 
 981         return 0;
 982 }
 983 
 984 static const struct dev_pm_ops dw_axi_dma_pm_ops = {
 985         SET_RUNTIME_PM_OPS(axi_dma_runtime_suspend, axi_dma_runtime_resume, NULL)
 986 };
 987 
 988 static const struct of_device_id dw_dma_of_id_table[] = {
 989         { .compatible = "snps,axi-dma-1.01a" },
 990         {}
 991 };
 992 MODULE_DEVICE_TABLE(of, dw_dma_of_id_table);
 993 
 994 static struct platform_driver dw_driver = {
 995         .probe          = dw_probe,
 996         .remove         = dw_remove,
 997         .driver = {
 998                 .name   = KBUILD_MODNAME,
 999                 .of_match_table = of_match_ptr(dw_dma_of_id_table),
1000                 .pm = &dw_axi_dma_pm_ops,
1001         },
1002 };
1003 module_platform_driver(dw_driver);
1004 
1005 MODULE_LICENSE("GPL v2");
1006 MODULE_DESCRIPTION("Synopsys DesignWare AXI DMA Controller platform driver");
1007 MODULE_AUTHOR("Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>");
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c

DEFINITIONS
