1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright 2015 Robert Jarzmik <robert.jarzmik@free.fr> 4 */ 5 6 #include <linux/err.h> 7 #include <linux/module.h> 8 #include <linux/init.h> 9 #include <linux/types.h> 10 #include <linux/interrupt.h> 11 #include <linux/dma-mapping.h> 12 #include <linux/slab.h> 13 #include <linux/dmaengine.h> 14 #include <linux/platform_device.h> 15 #include <linux/device.h> 16 #include <linux/platform_data/mmp_dma.h> 17 #include <linux/dmapool.h> 18 #include <linux/of_device.h> 19 #include <linux/of_dma.h> 20 #include <linux/of.h> 21 #include <linux/wait.h> 22 #include <linux/dma/pxa-dma.h> 23 24 #include "dmaengine.h" 25 #include "virt-dma.h" 26 27 #define DCSR(n) (0x0000 + ((n) << 2)) 28 #define DALGN(n) 0x00a0 29 #define DINT 0x00f0 30 #define DDADR(n) (0x0200 + ((n) << 4)) 31 #define DSADR(n) (0x0204 + ((n) << 4)) 32 #define DTADR(n) (0x0208 + ((n) << 4)) 33 #define DCMD(n) (0x020c + ((n) << 4)) 34 35 #define PXA_DCSR_RUN BIT(31) /* Run Bit (read / write) */ 36 #define PXA_DCSR_NODESC BIT(30) /* No-Descriptor Fetch (read / write) */ 37 #define PXA_DCSR_STOPIRQEN BIT(29) /* Stop Interrupt Enable (R/W) */ 38 #define PXA_DCSR_REQPEND BIT(8) /* Request Pending (read-only) */ 39 #define PXA_DCSR_STOPSTATE BIT(3) /* Stop State (read-only) */ 40 #define PXA_DCSR_ENDINTR BIT(2) /* End Interrupt (read / write) */ 41 #define PXA_DCSR_STARTINTR BIT(1) /* Start Interrupt (read / write) */ 42 #define PXA_DCSR_BUSERR BIT(0) /* Bus Error Interrupt (read / write) */ 43 44 #define PXA_DCSR_EORIRQEN BIT(28) /* End of Receive IRQ Enable (R/W) */ 45 #define PXA_DCSR_EORJMPEN BIT(27) /* Jump to next descriptor on EOR */ 46 #define PXA_DCSR_EORSTOPEN BIT(26) /* STOP on an EOR */ 47 #define PXA_DCSR_SETCMPST BIT(25) /* Set Descriptor Compare Status */ 48 #define PXA_DCSR_CLRCMPST BIT(24) /* Clear Descriptor Compare Status */ 49 #define PXA_DCSR_CMPST BIT(10) /* The Descriptor Compare Status */ 50 #define PXA_DCSR_EORINTR BIT(9) /* The end of Receive */ 51 52 #define DRCMR_MAPVLD BIT(7) /* Map Valid (read / write) */ 53 #define DRCMR_CHLNUM 0x1f /* mask for Channel Number (read / write) */ 54 55 #define DDADR_DESCADDR 0xfffffff0 /* Address of next descriptor (mask) */ 56 #define DDADR_STOP BIT(0) /* Stop (read / write) */ 57 58 #define PXA_DCMD_INCSRCADDR BIT(31) /* Source Address Increment Setting. */ 59 #define PXA_DCMD_INCTRGADDR BIT(30) /* Target Address Increment Setting. */ 60 #define PXA_DCMD_FLOWSRC BIT(29) /* Flow Control by the source. */ 61 #define PXA_DCMD_FLOWTRG BIT(28) /* Flow Control by the target. */ 62 #define PXA_DCMD_STARTIRQEN BIT(22) /* Start Interrupt Enable */ 63 #define PXA_DCMD_ENDIRQEN BIT(21) /* End Interrupt Enable */ 64 #define PXA_DCMD_ENDIAN BIT(18) /* Device Endian-ness. */ 65 #define PXA_DCMD_BURST8 (1 << 16) /* 8 byte burst */ 66 #define PXA_DCMD_BURST16 (2 << 16) /* 16 byte burst */ 67 #define PXA_DCMD_BURST32 (3 << 16) /* 32 byte burst */ 68 #define PXA_DCMD_WIDTH1 (1 << 14) /* 1 byte width */ 69 #define PXA_DCMD_WIDTH2 (2 << 14) /* 2 byte width (HalfWord) */ 70 #define PXA_DCMD_WIDTH4 (3 << 14) /* 4 byte width (Word) */ 71 #define PXA_DCMD_LENGTH 0x01fff /* length mask (max = 8K - 1) */ 72 73 #define PDMA_ALIGNMENT 3 74 #define PDMA_MAX_DESC_BYTES (PXA_DCMD_LENGTH & ~((1 << PDMA_ALIGNMENT) - 1)) 75 76 struct pxad_desc_hw { 77 u32 ddadr; /* Points to the next descriptor + flags */ 78 u32 dsadr; /* DSADR value for the current transfer */ 79 u32 dtadr; /* DTADR value for the current transfer */ 80 u32 dcmd; /* DCMD value for the current transfer */ 81 } __aligned(16); 82 83 struct pxad_desc_sw { 84 struct virt_dma_desc vd; /* Virtual descriptor */ 85 int nb_desc; /* Number of hw. descriptors */ 86 size_t len; /* Number of bytes xfered */ 87 dma_addr_t first; /* First descriptor's addr */ 88 89 /* At least one descriptor has an src/dst address not multiple of 8 */ 90 bool misaligned; 91 bool cyclic; 92 struct dma_pool *desc_pool; /* Channel's used allocator */ 93 94 struct pxad_desc_hw *hw_desc[]; /* DMA coherent descriptors */ 95 }; 96 97 struct pxad_phy { 98 int idx; 99 void __iomem *base; 100 struct pxad_chan *vchan; 101 }; 102 103 struct pxad_chan { 104 struct virt_dma_chan vc; /* Virtual channel */ 105 u32 drcmr; /* Requestor of the channel */ 106 enum pxad_chan_prio prio; /* Required priority of phy */ 107 /* 108 * At least one desc_sw in submitted or issued transfers on this channel 109 * has one address such as: addr % 8 != 0. This implies the DALGN 110 * setting on the phy. 111 */ 112 bool misaligned; 113 struct dma_slave_config cfg; /* Runtime config */ 114 115 /* protected by vc->lock */ 116 struct pxad_phy *phy; 117 struct dma_pool *desc_pool; /* Descriptors pool */ 118 dma_cookie_t bus_error; 119 120 wait_queue_head_t wq_state; 121 }; 122 123 struct pxad_device { 124 struct dma_device slave; 125 int nr_chans; 126 int nr_requestors; 127 void __iomem *base; 128 struct pxad_phy *phys; 129 spinlock_t phy_lock; /* Phy association */ 130 #ifdef CONFIG_DEBUG_FS 131 struct dentry *dbgfs_root; 132 struct dentry **dbgfs_chan; 133 #endif 134 }; 135 136 #define tx_to_pxad_desc(tx) \ 137 container_of(tx, struct pxad_desc_sw, async_tx) 138 #define to_pxad_chan(dchan) \ 139 container_of(dchan, struct pxad_chan, vc.chan) 140 #define to_pxad_dev(dmadev) \ 141 container_of(dmadev, struct pxad_device, slave) 142 #define to_pxad_sw_desc(_vd) \ 143 container_of((_vd), struct pxad_desc_sw, vd) 144 145 #define _phy_readl_relaxed(phy, _reg) \ 146 readl_relaxed((phy)->base + _reg((phy)->idx)) 147 #define phy_readl_relaxed(phy, _reg) \ 148 ({ \ 149 u32 _v; \ 150 _v = readl_relaxed((phy)->base + _reg((phy)->idx)); \ 151 dev_vdbg(&phy->vchan->vc.chan.dev->device, \ 152 "%s(): readl(%s): 0x%08x\n", __func__, #_reg, \ 153 _v); \ 154 _v; \ 155 }) 156 #define phy_writel(phy, val, _reg) \ 157 do { \ 158 writel((val), (phy)->base + _reg((phy)->idx)); \ 159 dev_vdbg(&phy->vchan->vc.chan.dev->device, \ 160 "%s(): writel(0x%08x, %s)\n", \ 161 __func__, (u32)(val), #_reg); \ 162 } while (0) 163 #define phy_writel_relaxed(phy, val, _reg) \ 164 do { \ 165 writel_relaxed((val), (phy)->base + _reg((phy)->idx)); \ 166 dev_vdbg(&phy->vchan->vc.chan.dev->device, \ 167 "%s(): writel_relaxed(0x%08x, %s)\n", \ 168 __func__, (u32)(val), #_reg); \ 169 } while (0) 170 171 static unsigned int pxad_drcmr(unsigned int line) 172 { 173 if (line < 64) 174 return 0x100 + line * 4; 175 return 0x1000 + line * 4; 176 } 177 178 static bool pxad_filter_fn(struct dma_chan *chan, void *param); 179 180 /* 181 * Debug fs 182 */ 183 #ifdef CONFIG_DEBUG_FS 184 #include <linux/debugfs.h> 185 #include <linux/uaccess.h> 186 #include <linux/seq_file.h> 187 188 static int requester_chan_show(struct seq_file *s, void *p) 189 { 190 struct pxad_phy *phy = s->private; 191 int i; 192 u32 drcmr; 193 194 seq_printf(s, "DMA channel %d requester :\n", phy->idx); 195 for (i = 0; i < 70; i++) { 196 drcmr = readl_relaxed(phy->base + pxad_drcmr(i)); 197 if ((drcmr & DRCMR_CHLNUM) == phy->idx) 198 seq_printf(s, "\tRequester %d (MAPVLD=%d)\n", i, 199 !!(drcmr & DRCMR_MAPVLD)); 200 } 201 return 0; 202 } 203 204 static inline int dbg_burst_from_dcmd(u32 dcmd) 205 { 206 int burst = (dcmd >> 16) & 0x3; 207 208 return burst ? 4 << burst : 0; 209 } 210 211 static int is_phys_valid(unsigned long addr) 212 { 213 return pfn_valid(__phys_to_pfn(addr)); 214 } 215 216 #define PXA_DCSR_STR(flag) (dcsr & PXA_DCSR_##flag ? #flag" " : "") 217 #define PXA_DCMD_STR(flag) (dcmd & PXA_DCMD_##flag ? #flag" " : "") 218 219 static int descriptors_show(struct seq_file *s, void *p) 220 { 221 struct pxad_phy *phy = s->private; 222 int i, max_show = 20, burst, width; 223 u32 dcmd; 224 unsigned long phys_desc, ddadr; 225 struct pxad_desc_hw *desc; 226 227 phys_desc = ddadr = _phy_readl_relaxed(phy, DDADR); 228 229 seq_printf(s, "DMA channel %d descriptors :\n", phy->idx); 230 seq_printf(s, "[%03d] First descriptor unknown\n", 0); 231 for (i = 1; i < max_show && is_phys_valid(phys_desc); i++) { 232 desc = phys_to_virt(phys_desc); 233 dcmd = desc->dcmd; 234 burst = dbg_burst_from_dcmd(dcmd); 235 width = (1 << ((dcmd >> 14) & 0x3)) >> 1; 236 237 seq_printf(s, "[%03d] Desc at %08lx(virt %p)\n", 238 i, phys_desc, desc); 239 seq_printf(s, "\tDDADR = %08x\n", desc->ddadr); 240 seq_printf(s, "\tDSADR = %08x\n", desc->dsadr); 241 seq_printf(s, "\tDTADR = %08x\n", desc->dtadr); 242 seq_printf(s, "\tDCMD = %08x (%s%s%s%s%s%s%sburst=%d width=%d len=%d)\n", 243 dcmd, 244 PXA_DCMD_STR(INCSRCADDR), PXA_DCMD_STR(INCTRGADDR), 245 PXA_DCMD_STR(FLOWSRC), PXA_DCMD_STR(FLOWTRG), 246 PXA_DCMD_STR(STARTIRQEN), PXA_DCMD_STR(ENDIRQEN), 247 PXA_DCMD_STR(ENDIAN), burst, width, 248 dcmd & PXA_DCMD_LENGTH); 249 phys_desc = desc->ddadr; 250 } 251 if (i == max_show) 252 seq_printf(s, "[%03d] Desc at %08lx ... max display reached\n", 253 i, phys_desc); 254 else 255 seq_printf(s, "[%03d] Desc at %08lx is %s\n", 256 i, phys_desc, phys_desc == DDADR_STOP ? 257 "DDADR_STOP" : "invalid"); 258 259 return 0; 260 } 261 262 static int chan_state_show(struct seq_file *s, void *p) 263 { 264 struct pxad_phy *phy = s->private; 265 u32 dcsr, dcmd; 266 int burst, width; 267 static const char * const str_prio[] = { 268 "high", "normal", "low", "invalid" 269 }; 270 271 dcsr = _phy_readl_relaxed(phy, DCSR); 272 dcmd = _phy_readl_relaxed(phy, DCMD); 273 burst = dbg_burst_from_dcmd(dcmd); 274 width = (1 << ((dcmd >> 14) & 0x3)) >> 1; 275 276 seq_printf(s, "DMA channel %d\n", phy->idx); 277 seq_printf(s, "\tPriority : %s\n", 278 str_prio[(phy->idx & 0xf) / 4]); 279 seq_printf(s, "\tUnaligned transfer bit: %s\n", 280 _phy_readl_relaxed(phy, DALGN) & BIT(phy->idx) ? 281 "yes" : "no"); 282 seq_printf(s, "\tDCSR = %08x (%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s)\n", 283 dcsr, PXA_DCSR_STR(RUN), PXA_DCSR_STR(NODESC), 284 PXA_DCSR_STR(STOPIRQEN), PXA_DCSR_STR(EORIRQEN), 285 PXA_DCSR_STR(EORJMPEN), PXA_DCSR_STR(EORSTOPEN), 286 PXA_DCSR_STR(SETCMPST), PXA_DCSR_STR(CLRCMPST), 287 PXA_DCSR_STR(CMPST), PXA_DCSR_STR(EORINTR), 288 PXA_DCSR_STR(REQPEND), PXA_DCSR_STR(STOPSTATE), 289 PXA_DCSR_STR(ENDINTR), PXA_DCSR_STR(STARTINTR), 290 PXA_DCSR_STR(BUSERR)); 291 292 seq_printf(s, "\tDCMD = %08x (%s%s%s%s%s%s%sburst=%d width=%d len=%d)\n", 293 dcmd, 294 PXA_DCMD_STR(INCSRCADDR), PXA_DCMD_STR(INCTRGADDR), 295 PXA_DCMD_STR(FLOWSRC), PXA_DCMD_STR(FLOWTRG), 296 PXA_DCMD_STR(STARTIRQEN), PXA_DCMD_STR(ENDIRQEN), 297 PXA_DCMD_STR(ENDIAN), burst, width, dcmd & PXA_DCMD_LENGTH); 298 seq_printf(s, "\tDSADR = %08x\n", _phy_readl_relaxed(phy, DSADR)); 299 seq_printf(s, "\tDTADR = %08x\n", _phy_readl_relaxed(phy, DTADR)); 300 seq_printf(s, "\tDDADR = %08x\n", _phy_readl_relaxed(phy, DDADR)); 301 302 return 0; 303 } 304 305 static int state_show(struct seq_file *s, void *p) 306 { 307 struct pxad_device *pdev = s->private; 308 309 /* basic device status */ 310 seq_puts(s, "DMA engine status\n"); 311 seq_printf(s, "\tChannel number: %d\n", pdev->nr_chans); 312 313 return 0; 314 } 315 316 DEFINE_SHOW_ATTRIBUTE(state); 317 DEFINE_SHOW_ATTRIBUTE(chan_state); 318 DEFINE_SHOW_ATTRIBUTE(descriptors); 319 DEFINE_SHOW_ATTRIBUTE(requester_chan); 320 321 static struct dentry *pxad_dbg_alloc_chan(struct pxad_device *pdev, 322 int ch, struct dentry *chandir) 323 { 324 char chan_name[11]; 325 struct dentry *chan; 326 void *dt; 327 328 scnprintf(chan_name, sizeof(chan_name), "%d", ch); 329 chan = debugfs_create_dir(chan_name, chandir); 330 dt = (void *)&pdev->phys[ch]; 331 332 debugfs_create_file("state", 0400, chan, dt, &chan_state_fops); 333 debugfs_create_file("descriptors", 0400, chan, dt, &descriptors_fops); 334 debugfs_create_file("requesters", 0400, chan, dt, &requester_chan_fops); 335 336 return chan; 337 } 338 339 static void pxad_init_debugfs(struct pxad_device *pdev) 340 { 341 int i; 342 struct dentry *chandir; 343 344 pdev->dbgfs_chan = 345 kmalloc_array(pdev->nr_chans, sizeof(struct dentry *), 346 GFP_KERNEL); 347 if (!pdev->dbgfs_chan) 348 return; 349 350 pdev->dbgfs_root = debugfs_create_dir(dev_name(pdev->slave.dev), NULL); 351 352 debugfs_create_file("state", 0400, pdev->dbgfs_root, pdev, &state_fops); 353 354 chandir = debugfs_create_dir("channels", pdev->dbgfs_root); 355 356 for (i = 0; i < pdev->nr_chans; i++) 357 pdev->dbgfs_chan[i] = pxad_dbg_alloc_chan(pdev, i, chandir); 358 } 359 360 static void pxad_cleanup_debugfs(struct pxad_device *pdev) 361 { 362 debugfs_remove_recursive(pdev->dbgfs_root); 363 } 364 #else 365 static inline void pxad_init_debugfs(struct pxad_device *pdev) {} 366 static inline void pxad_cleanup_debugfs(struct pxad_device *pdev) {} 367 #endif 368 369 static struct pxad_phy *lookup_phy(struct pxad_chan *pchan) 370 { 371 int prio, i; 372 struct pxad_device *pdev = to_pxad_dev(pchan->vc.chan.device); 373 struct pxad_phy *phy, *found = NULL; 374 unsigned long flags; 375 376 /* 377 * dma channel priorities 378 * ch 0 - 3, 16 - 19 <--> (0) 379 * ch 4 - 7, 20 - 23 <--> (1) 380 * ch 8 - 11, 24 - 27 <--> (2) 381 * ch 12 - 15, 28 - 31 <--> (3) 382 */ 383 384 spin_lock_irqsave(&pdev->phy_lock, flags); 385 for (prio = pchan->prio; prio >= PXAD_PRIO_HIGHEST; prio--) { 386 for (i = 0; i < pdev->nr_chans; i++) { 387 if (prio != (i & 0xf) >> 2) 388 continue; 389 phy = &pdev->phys[i]; 390 if (!phy->vchan) { 391 phy->vchan = pchan; 392 found = phy; 393 goto out_unlock; 394 } 395 } 396 } 397 398 out_unlock: 399 spin_unlock_irqrestore(&pdev->phy_lock, flags); 400 dev_dbg(&pchan->vc.chan.dev->device, 401 "%s(): phy=%p(%d)\n", __func__, found, 402 found ? found->idx : -1); 403 404 return found; 405 } 406 407 static void pxad_free_phy(struct pxad_chan *chan) 408 { 409 struct pxad_device *pdev = to_pxad_dev(chan->vc.chan.device); 410 unsigned long flags; 411 u32 reg; 412 413 dev_dbg(&chan->vc.chan.dev->device, 414 "%s(): freeing\n", __func__); 415 if (!chan->phy) 416 return; 417 418 /* clear the channel mapping in DRCMR */ 419 if (chan->drcmr <= pdev->nr_requestors) { 420 reg = pxad_drcmr(chan->drcmr); 421 writel_relaxed(0, chan->phy->base + reg); 422 } 423 424 spin_lock_irqsave(&pdev->phy_lock, flags); 425 chan->phy->vchan = NULL; 426 chan->phy = NULL; 427 spin_unlock_irqrestore(&pdev->phy_lock, flags); 428 } 429 430 static bool is_chan_running(struct pxad_chan *chan) 431 { 432 u32 dcsr; 433 struct pxad_phy *phy = chan->phy; 434 435 if (!phy) 436 return false; 437 dcsr = phy_readl_relaxed(phy, DCSR); 438 return dcsr & PXA_DCSR_RUN; 439 } 440 441 static bool is_running_chan_misaligned(struct pxad_chan *chan) 442 { 443 u32 dalgn; 444 445 BUG_ON(!chan->phy); 446 dalgn = phy_readl_relaxed(chan->phy, DALGN); 447 return dalgn & (BIT(chan->phy->idx)); 448 } 449 450 static void phy_enable(struct pxad_phy *phy, bool misaligned) 451 { 452 struct pxad_device *pdev; 453 u32 reg, dalgn; 454 455 if (!phy->vchan) 456 return; 457 458 dev_dbg(&phy->vchan->vc.chan.dev->device, 459 "%s(); phy=%p(%d) misaligned=%d\n", __func__, 460 phy, phy->idx, misaligned); 461 462 pdev = to_pxad_dev(phy->vchan->vc.chan.device); 463 if (phy->vchan->drcmr <= pdev->nr_requestors) { 464 reg = pxad_drcmr(phy->vchan->drcmr); 465 writel_relaxed(DRCMR_MAPVLD | phy->idx, phy->base + reg); 466 } 467 468 dalgn = phy_readl_relaxed(phy, DALGN); 469 if (misaligned) 470 dalgn |= BIT(phy->idx); 471 else 472 dalgn &= ~BIT(phy->idx); 473 phy_writel_relaxed(phy, dalgn, DALGN); 474 475 phy_writel(phy, PXA_DCSR_STOPIRQEN | PXA_DCSR_ENDINTR | 476 PXA_DCSR_BUSERR | PXA_DCSR_RUN, DCSR); 477 } 478 479 static void phy_disable(struct pxad_phy *phy) 480 { 481 u32 dcsr; 482 483 if (!phy) 484 return; 485 486 dcsr = phy_readl_relaxed(phy, DCSR); 487 dev_dbg(&phy->vchan->vc.chan.dev->device, 488 "%s(): phy=%p(%d)\n", __func__, phy, phy->idx); 489 phy_writel(phy, dcsr & ~PXA_DCSR_RUN & ~PXA_DCSR_STOPIRQEN, DCSR); 490 } 491 492 static void pxad_launch_chan(struct pxad_chan *chan, 493 struct pxad_desc_sw *desc) 494 { 495 dev_dbg(&chan->vc.chan.dev->device, 496 "%s(): desc=%p\n", __func__, desc); 497 if (!chan->phy) { 498 chan->phy = lookup_phy(chan); 499 if (!chan->phy) { 500 dev_dbg(&chan->vc.chan.dev->device, 501 "%s(): no free dma channel\n", __func__); 502 return; 503 } 504 } 505 chan->bus_error = 0; 506 507 /* 508 * Program the descriptor's address into the DMA controller, 509 * then start the DMA transaction 510 */ 511 phy_writel(chan->phy, desc->first, DDADR); 512 phy_enable(chan->phy, chan->misaligned); 513 wake_up(&chan->wq_state); 514 } 515 516 static void set_updater_desc(struct pxad_desc_sw *sw_desc, 517 unsigned long flags) 518 { 519 struct pxad_desc_hw *updater = 520 sw_desc->hw_desc[sw_desc->nb_desc - 1]; 521 dma_addr_t dma = sw_desc->hw_desc[sw_desc->nb_desc - 2]->ddadr; 522 523 updater->ddadr = DDADR_STOP; 524 updater->dsadr = dma; 525 updater->dtadr = dma + 8; 526 updater->dcmd = PXA_DCMD_WIDTH4 | PXA_DCMD_BURST32 | 527 (PXA_DCMD_LENGTH & sizeof(u32)); 528 if (flags & DMA_PREP_INTERRUPT) 529 updater->dcmd |= PXA_DCMD_ENDIRQEN; 530 if (sw_desc->cyclic) 531 sw_desc->hw_desc[sw_desc->nb_desc - 2]->ddadr = sw_desc->first; 532 } 533 534 static bool is_desc_completed(struct virt_dma_desc *vd) 535 { 536 struct pxad_desc_sw *sw_desc = to_pxad_sw_desc(vd); 537 struct pxad_desc_hw *updater = 538 sw_desc->hw_desc[sw_desc->nb_desc - 1]; 539 540 return updater->dtadr != (updater->dsadr + 8); 541 } 542 543 static void pxad_desc_chain(struct virt_dma_desc *vd1, 544 struct virt_dma_desc *vd2) 545 { 546 struct pxad_desc_sw *desc1 = to_pxad_sw_desc(vd1); 547 struct pxad_desc_sw *desc2 = to_pxad_sw_desc(vd2); 548 dma_addr_t dma_to_chain; 549 550 dma_to_chain = desc2->first; 551 desc1->hw_desc[desc1->nb_desc - 1]->ddadr = dma_to_chain; 552 } 553 554 static bool pxad_try_hotchain(struct virt_dma_chan *vc, 555 struct virt_dma_desc *vd) 556 { 557 struct virt_dma_desc *vd_last_issued = NULL; 558 struct pxad_chan *chan = to_pxad_chan(&vc->chan); 559 560 /* 561 * Attempt to hot chain the tx if the phy is still running. This is 562 * considered successful only if either the channel is still running 563 * after the chaining, or if the chained transfer is completed after 564 * having been hot chained. 565 * A change of alignment is not allowed, and forbids hotchaining. 566 */ 567 if (is_chan_running(chan)) { 568 BUG_ON(list_empty(&vc->desc_issued)); 569 570 if (!is_running_chan_misaligned(chan) && 571 to_pxad_sw_desc(vd)->misaligned) 572 return false; 573 574 vd_last_issued = list_entry(vc->desc_issued.prev, 575 struct virt_dma_desc, node); 576 pxad_desc_chain(vd_last_issued, vd); 577 if (is_chan_running(chan) || is_desc_completed(vd)) 578 return true; 579 } 580 581 return false; 582 } 583 584 static unsigned int clear_chan_irq(struct pxad_phy *phy) 585 { 586 u32 dcsr; 587 u32 dint = readl(phy->base + DINT); 588 589 if (!(dint & BIT(phy->idx))) 590 return PXA_DCSR_RUN; 591 592 /* clear irq */ 593 dcsr = phy_readl_relaxed(phy, DCSR); 594 phy_writel(phy, dcsr, DCSR); 595 if ((dcsr & PXA_DCSR_BUSERR) && (phy->vchan)) 596 dev_warn(&phy->vchan->vc.chan.dev->device, 597 "%s(chan=%p): PXA_DCSR_BUSERR\n", 598 __func__, &phy->vchan); 599 600 return dcsr & ~PXA_DCSR_RUN; 601 } 602 603 static irqreturn_t pxad_chan_handler(int irq, void *dev_id) 604 { 605 struct pxad_phy *phy = dev_id; 606 struct pxad_chan *chan = phy->vchan; 607 struct virt_dma_desc *vd, *tmp; 608 unsigned int dcsr; 609 bool vd_completed; 610 dma_cookie_t last_started = 0; 611 612 BUG_ON(!chan); 613 614 dcsr = clear_chan_irq(phy); 615 if (dcsr & PXA_DCSR_RUN) 616 return IRQ_NONE; 617 618 spin_lock(&chan->vc.lock); 619 list_for_each_entry_safe(vd, tmp, &chan->vc.desc_issued, node) { 620 vd_completed = is_desc_completed(vd); 621 dev_dbg(&chan->vc.chan.dev->device, 622 "%s(): checking txd %p[%x]: completed=%d dcsr=0x%x\n", 623 __func__, vd, vd->tx.cookie, vd_completed, 624 dcsr); 625 last_started = vd->tx.cookie; 626 if (to_pxad_sw_desc(vd)->cyclic) { 627 vchan_cyclic_callback(vd); 628 break; 629 } 630 if (vd_completed) { 631 list_del(&vd->node); 632 vchan_cookie_complete(vd); 633 } else { 634 break; 635 } 636 } 637 638 if (dcsr & PXA_DCSR_BUSERR) { 639 chan->bus_error = last_started; 640 phy_disable(phy); 641 } 642 643 if (!chan->bus_error && dcsr & PXA_DCSR_STOPSTATE) { 644 dev_dbg(&chan->vc.chan.dev->device, 645 "%s(): channel stopped, submitted_empty=%d issued_empty=%d", 646 __func__, 647 list_empty(&chan->vc.desc_submitted), 648 list_empty(&chan->vc.desc_issued)); 649 phy_writel_relaxed(phy, dcsr & ~PXA_DCSR_STOPIRQEN, DCSR); 650 651 if (list_empty(&chan->vc.desc_issued)) { 652 chan->misaligned = 653 !list_empty(&chan->vc.desc_submitted); 654 } else { 655 vd = list_first_entry(&chan->vc.desc_issued, 656 struct virt_dma_desc, node); 657 pxad_launch_chan(chan, to_pxad_sw_desc(vd)); 658 } 659 } 660 spin_unlock(&chan->vc.lock); 661 wake_up(&chan->wq_state); 662 663 return IRQ_HANDLED; 664 } 665 666 static irqreturn_t pxad_int_handler(int irq, void *dev_id) 667 { 668 struct pxad_device *pdev = dev_id; 669 struct pxad_phy *phy; 670 u32 dint = readl(pdev->base + DINT); 671 int i, ret = IRQ_NONE; 672 673 while (dint) { 674 i = __ffs(dint); 675 dint &= (dint - 1); 676 phy = &pdev->phys[i]; 677 if (pxad_chan_handler(irq, phy) == IRQ_HANDLED) 678 ret = IRQ_HANDLED; 679 } 680 681 return ret; 682 } 683 684 static int pxad_alloc_chan_resources(struct dma_chan *dchan) 685 { 686 struct pxad_chan *chan = to_pxad_chan(dchan); 687 struct pxad_device *pdev = to_pxad_dev(chan->vc.chan.device); 688 689 if (chan->desc_pool) 690 return 1; 691 692 chan->desc_pool = dma_pool_create(dma_chan_name(dchan), 693 pdev->slave.dev, 694 sizeof(struct pxad_desc_hw), 695 __alignof__(struct pxad_desc_hw), 696 0); 697 if (!chan->desc_pool) { 698 dev_err(&chan->vc.chan.dev->device, 699 "%s(): unable to allocate descriptor pool\n", 700 __func__); 701 return -ENOMEM; 702 } 703 704 return 1; 705 } 706 707 static void pxad_free_chan_resources(struct dma_chan *dchan) 708 { 709 struct pxad_chan *chan = to_pxad_chan(dchan); 710 711 vchan_free_chan_resources(&chan->vc); 712 dma_pool_destroy(chan->desc_pool); 713 chan->desc_pool = NULL; 714 715 chan->drcmr = U32_MAX; 716 chan->prio = PXAD_PRIO_LOWEST; 717 } 718 719 static void pxad_free_desc(struct virt_dma_desc *vd) 720 { 721 int i; 722 dma_addr_t dma; 723 struct pxad_desc_sw *sw_desc = to_pxad_sw_desc(vd); 724 725 BUG_ON(sw_desc->nb_desc == 0); 726 for (i = sw_desc->nb_desc - 1; i >= 0; i--) { 727 if (i > 0) 728 dma = sw_desc->hw_desc[i - 1]->ddadr; 729 else 730 dma = sw_desc->first; 731 dma_pool_free(sw_desc->desc_pool, 732 sw_desc->hw_desc[i], dma); 733 } 734 sw_desc->nb_desc = 0; 735 kfree(sw_desc); 736 } 737 738 static struct pxad_desc_sw * 739 pxad_alloc_desc(struct pxad_chan *chan, unsigned int nb_hw_desc) 740 { 741 struct pxad_desc_sw *sw_desc; 742 dma_addr_t dma; 743 int i; 744 745 sw_desc = kzalloc(struct_size(sw_desc, hw_desc, nb_hw_desc), 746 GFP_NOWAIT); 747 if (!sw_desc) 748 return NULL; 749 sw_desc->desc_pool = chan->desc_pool; 750 751 for (i = 0; i < nb_hw_desc; i++) { 752 sw_desc->hw_desc[i] = dma_pool_alloc(sw_desc->desc_pool, 753 GFP_NOWAIT, &dma); 754 if (!sw_desc->hw_desc[i]) { 755 dev_err(&chan->vc.chan.dev->device, 756 "%s(): Couldn't allocate the %dth hw_desc from dma_pool %p\n", 757 __func__, i, sw_desc->desc_pool); 758 goto err; 759 } 760 761 if (i == 0) 762 sw_desc->first = dma; 763 else 764 sw_desc->hw_desc[i - 1]->ddadr = dma; 765 sw_desc->nb_desc++; 766 } 767 768 return sw_desc; 769 err: 770 pxad_free_desc(&sw_desc->vd); 771 return NULL; 772 } 773 774 static dma_cookie_t pxad_tx_submit(struct dma_async_tx_descriptor *tx) 775 { 776 struct virt_dma_chan *vc = to_virt_chan(tx->chan); 777 struct pxad_chan *chan = to_pxad_chan(&vc->chan); 778 struct virt_dma_desc *vd_chained = NULL, 779 *vd = container_of(tx, struct virt_dma_desc, tx); 780 dma_cookie_t cookie; 781 unsigned long flags; 782 783 set_updater_desc(to_pxad_sw_desc(vd), tx->flags); 784 785 spin_lock_irqsave(&vc->lock, flags); 786 cookie = dma_cookie_assign(tx); 787 788 if (list_empty(&vc->desc_submitted) && pxad_try_hotchain(vc, vd)) { 789 list_move_tail(&vd->node, &vc->desc_issued); 790 dev_dbg(&chan->vc.chan.dev->device, 791 "%s(): txd %p[%x]: submitted (hot linked)\n", 792 __func__, vd, cookie); 793 goto out; 794 } 795 796 /* 797 * Fallback to placing the tx in the submitted queue 798 */ 799 if (!list_empty(&vc->desc_submitted)) { 800 vd_chained = list_entry(vc->desc_submitted.prev, 801 struct virt_dma_desc, node); 802 /* 803 * Only chain the descriptors if no new misalignment is 804 * introduced. If a new misalignment is chained, let the channel 805 * stop, and be relaunched in misalign mode from the irq 806 * handler. 807 */ 808 if (chan->misaligned || !to_pxad_sw_desc(vd)->misaligned) 809 pxad_desc_chain(vd_chained, vd); 810 else 811 vd_chained = NULL; 812 } 813 dev_dbg(&chan->vc.chan.dev->device, 814 "%s(): txd %p[%x]: submitted (%s linked)\n", 815 __func__, vd, cookie, vd_chained ? "cold" : "not"); 816 list_move_tail(&vd->node, &vc->desc_submitted); 817 chan->misaligned |= to_pxad_sw_desc(vd)->misaligned; 818 819 out: 820 spin_unlock_irqrestore(&vc->lock, flags); 821 return cookie; 822 } 823 824 static void pxad_issue_pending(struct dma_chan *dchan) 825 { 826 struct pxad_chan *chan = to_pxad_chan(dchan); 827 struct virt_dma_desc *vd_first; 828 unsigned long flags; 829 830 spin_lock_irqsave(&chan->vc.lock, flags); 831 if (list_empty(&chan->vc.desc_submitted)) 832 goto out; 833 834 vd_first = list_first_entry(&chan->vc.desc_submitted, 835 struct virt_dma_desc, node); 836 dev_dbg(&chan->vc.chan.dev->device, 837 "%s(): txd %p[%x]", __func__, vd_first, vd_first->tx.cookie); 838 839 vchan_issue_pending(&chan->vc); 840 if (!pxad_try_hotchain(&chan->vc, vd_first)) 841 pxad_launch_chan(chan, to_pxad_sw_desc(vd_first)); 842 out: 843 spin_unlock_irqrestore(&chan->vc.lock, flags); 844 } 845 846 static inline struct dma_async_tx_descriptor * 847 pxad_tx_prep(struct virt_dma_chan *vc, struct virt_dma_desc *vd, 848 unsigned long tx_flags) 849 { 850 struct dma_async_tx_descriptor *tx; 851 struct pxad_chan *chan = container_of(vc, struct pxad_chan, vc); 852 853 INIT_LIST_HEAD(&vd->node); 854 tx = vchan_tx_prep(vc, vd, tx_flags); 855 tx->tx_submit = pxad_tx_submit; 856 dev_dbg(&chan->vc.chan.dev->device, 857 "%s(): vc=%p txd=%p[%x] flags=0x%lx\n", __func__, 858 vc, vd, vd->tx.cookie, 859 tx_flags); 860 861 return tx; 862 } 863 864 static void pxad_get_config(struct pxad_chan *chan, 865 enum dma_transfer_direction dir, 866 u32 *dcmd, u32 *dev_src, u32 *dev_dst) 867 { 868 u32 maxburst = 0, dev_addr = 0; 869 enum dma_slave_buswidth width = DMA_SLAVE_BUSWIDTH_UNDEFINED; 870 struct pxad_device *pdev = to_pxad_dev(chan->vc.chan.device); 871 872 *dcmd = 0; 873 if (dir == DMA_DEV_TO_MEM) { 874 maxburst = chan->cfg.src_maxburst; 875 width = chan->cfg.src_addr_width; 876 dev_addr = chan->cfg.src_addr; 877 *dev_src = dev_addr; 878 *dcmd |= PXA_DCMD_INCTRGADDR; 879 if (chan->drcmr <= pdev->nr_requestors) 880 *dcmd |= PXA_DCMD_FLOWSRC; 881 } 882 if (dir == DMA_MEM_TO_DEV) { 883 maxburst = chan->cfg.dst_maxburst; 884 width = chan->cfg.dst_addr_width; 885 dev_addr = chan->cfg.dst_addr; 886 *dev_dst = dev_addr; 887 *dcmd |= PXA_DCMD_INCSRCADDR; 888 if (chan->drcmr <= pdev->nr_requestors) 889 *dcmd |= PXA_DCMD_FLOWTRG; 890 } 891 if (dir == DMA_MEM_TO_MEM) 892 *dcmd |= PXA_DCMD_BURST32 | PXA_DCMD_INCTRGADDR | 893 PXA_DCMD_INCSRCADDR; 894 895 dev_dbg(&chan->vc.chan.dev->device, 896 "%s(): dev_addr=0x%x maxburst=%d width=%d dir=%d\n", 897 __func__, dev_addr, maxburst, width, dir); 898 899 if (width == DMA_SLAVE_BUSWIDTH_1_BYTE) 900 *dcmd |= PXA_DCMD_WIDTH1; 901 else if (width == DMA_SLAVE_BUSWIDTH_2_BYTES) 902 *dcmd |= PXA_DCMD_WIDTH2; 903 else if (width == DMA_SLAVE_BUSWIDTH_4_BYTES) 904 *dcmd |= PXA_DCMD_WIDTH4; 905 906 if (maxburst == 8) 907 *dcmd |= PXA_DCMD_BURST8; 908 else if (maxburst == 16) 909 *dcmd |= PXA_DCMD_BURST16; 910 else if (maxburst == 32) 911 *dcmd |= PXA_DCMD_BURST32; 912 } 913 914 static struct dma_async_tx_descriptor * 915 pxad_prep_memcpy(struct dma_chan *dchan, 916 dma_addr_t dma_dst, dma_addr_t dma_src, 917 size_t len, unsigned long flags) 918 { 919 struct pxad_chan *chan = to_pxad_chan(dchan); 920 struct pxad_desc_sw *sw_desc; 921 struct pxad_desc_hw *hw_desc; 922 u32 dcmd; 923 unsigned int i, nb_desc = 0; 924 size_t copy; 925 926 if (!dchan || !len) 927 return NULL; 928 929 dev_dbg(&chan->vc.chan.dev->device, 930 "%s(): dma_dst=0x%lx dma_src=0x%lx len=%zu flags=%lx\n", 931 __func__, (unsigned long)dma_dst, (unsigned long)dma_src, 932 len, flags); 933 pxad_get_config(chan, DMA_MEM_TO_MEM, &dcmd, NULL, NULL); 934 935 nb_desc = DIV_ROUND_UP(len, PDMA_MAX_DESC_BYTES); 936 sw_desc = pxad_alloc_desc(chan, nb_desc + 1); 937 if (!sw_desc) 938 return NULL; 939 sw_desc->len = len; 940 941 if (!IS_ALIGNED(dma_src, 1 << PDMA_ALIGNMENT) || 942 !IS_ALIGNED(dma_dst, 1 << PDMA_ALIGNMENT)) 943 sw_desc->misaligned = true; 944 945 i = 0; 946 do { 947 hw_desc = sw_desc->hw_desc[i++]; 948 copy = min_t(size_t, len, PDMA_MAX_DESC_BYTES); 949 hw_desc->dcmd = dcmd | (PXA_DCMD_LENGTH & copy); 950 hw_desc->dsadr = dma_src; 951 hw_desc->dtadr = dma_dst; 952 len -= copy; 953 dma_src += copy; 954 dma_dst += copy; 955 } while (len); 956 set_updater_desc(sw_desc, flags); 957 958 return pxad_tx_prep(&chan->vc, &sw_desc->vd, flags); 959 } 960 961 static struct dma_async_tx_descriptor * 962 pxad_prep_slave_sg(struct dma_chan *dchan, struct scatterlist *sgl, 963 unsigned int sg_len, enum dma_transfer_direction dir, 964 unsigned long flags, void *context) 965 { 966 struct pxad_chan *chan = to_pxad_chan(dchan); 967 struct pxad_desc_sw *sw_desc; 968 size_t len, avail; 969 struct scatterlist *sg; 970 dma_addr_t dma; 971 u32 dcmd, dsadr = 0, dtadr = 0; 972 unsigned int nb_desc = 0, i, j = 0; 973 974 if ((sgl == NULL) || (sg_len == 0)) 975 return NULL; 976 977 pxad_get_config(chan, dir, &dcmd, &dsadr, &dtadr); 978 dev_dbg(&chan->vc.chan.dev->device, 979 "%s(): dir=%d flags=%lx\n", __func__, dir, flags); 980 981 for_each_sg(sgl, sg, sg_len, i) 982 nb_desc += DIV_ROUND_UP(sg_dma_len(sg), PDMA_MAX_DESC_BYTES); 983 sw_desc = pxad_alloc_desc(chan, nb_desc + 1); 984 if (!sw_desc) 985 return NULL; 986 987 for_each_sg(sgl, sg, sg_len, i) { 988 dma = sg_dma_address(sg); 989 avail = sg_dma_len(sg); 990 sw_desc->len += avail; 991 992 do { 993 len = min_t(size_t, avail, PDMA_MAX_DESC_BYTES); 994 if (dma & 0x7) 995 sw_desc->misaligned = true; 996 997 sw_desc->hw_desc[j]->dcmd = 998 dcmd | (PXA_DCMD_LENGTH & len); 999 sw_desc->hw_desc[j]->dsadr = dsadr ? dsadr : dma; 1000 sw_desc->hw_desc[j++]->dtadr = dtadr ? dtadr : dma; 1001 1002 dma += len; 1003 avail -= len; 1004 } while (avail); 1005 } 1006 set_updater_desc(sw_desc, flags); 1007 1008 return pxad_tx_prep(&chan->vc, &sw_desc->vd, flags); 1009 } 1010 1011 static struct dma_async_tx_descriptor * 1012 pxad_prep_dma_cyclic(struct dma_chan *dchan, 1013 dma_addr_t buf_addr, size_t len, size_t period_len, 1014 enum dma_transfer_direction dir, unsigned long flags) 1015 { 1016 struct pxad_chan *chan = to_pxad_chan(dchan); 1017 struct pxad_desc_sw *sw_desc; 1018 struct pxad_desc_hw **phw_desc; 1019 dma_addr_t dma; 1020 u32 dcmd, dsadr = 0, dtadr = 0; 1021 unsigned int nb_desc = 0; 1022 1023 if (!dchan || !len || !period_len) 1024 return NULL; 1025 if ((dir != DMA_DEV_TO_MEM) && (dir != DMA_MEM_TO_DEV)) { 1026 dev_err(&chan->vc.chan.dev->device, 1027 "Unsupported direction for cyclic DMA\n"); 1028 return NULL; 1029 } 1030 /* the buffer length must be a multiple of period_len */ 1031 if (len % period_len != 0 || period_len > PDMA_MAX_DESC_BYTES || 1032 !IS_ALIGNED(period_len, 1 << PDMA_ALIGNMENT)) 1033 return NULL; 1034 1035 pxad_get_config(chan, dir, &dcmd, &dsadr, &dtadr); 1036 dcmd |= PXA_DCMD_ENDIRQEN | (PXA_DCMD_LENGTH & period_len); 1037 dev_dbg(&chan->vc.chan.dev->device, 1038 "%s(): buf_addr=0x%lx len=%zu period=%zu dir=%d flags=%lx\n", 1039 __func__, (unsigned long)buf_addr, len, period_len, dir, flags); 1040 1041 nb_desc = DIV_ROUND_UP(period_len, PDMA_MAX_DESC_BYTES); 1042 nb_desc *= DIV_ROUND_UP(len, period_len); 1043 sw_desc = pxad_alloc_desc(chan, nb_desc + 1); 1044 if (!sw_desc) 1045 return NULL; 1046 sw_desc->cyclic = true; 1047 sw_desc->len = len; 1048 1049 phw_desc = sw_desc->hw_desc; 1050 dma = buf_addr; 1051 do { 1052 phw_desc[0]->dsadr = dsadr ? dsadr : dma; 1053 phw_desc[0]->dtadr = dtadr ? dtadr : dma; 1054 phw_desc[0]->dcmd = dcmd; 1055 phw_desc++; 1056 dma += period_len; 1057 len -= period_len; 1058 } while (len); 1059 set_updater_desc(sw_desc, flags); 1060 1061 return pxad_tx_prep(&chan->vc, &sw_desc->vd, flags); 1062 } 1063 1064 static int pxad_config(struct dma_chan *dchan, 1065 struct dma_slave_config *cfg) 1066 { 1067 struct pxad_chan *chan = to_pxad_chan(dchan); 1068 1069 if (!dchan) 1070 return -EINVAL; 1071 1072 chan->cfg = *cfg; 1073 return 0; 1074 } 1075 1076 static int pxad_terminate_all(struct dma_chan *dchan) 1077 { 1078 struct pxad_chan *chan = to_pxad_chan(dchan); 1079 struct pxad_device *pdev = to_pxad_dev(chan->vc.chan.device); 1080 struct virt_dma_desc *vd = NULL; 1081 unsigned long flags; 1082 struct pxad_phy *phy; 1083 LIST_HEAD(head); 1084 1085 dev_dbg(&chan->vc.chan.dev->device, 1086 "%s(): vchan %p: terminate all\n", __func__, &chan->vc); 1087 1088 spin_lock_irqsave(&chan->vc.lock, flags); 1089 vchan_get_all_descriptors(&chan->vc, &head); 1090 1091 list_for_each_entry(vd, &head, node) { 1092 dev_dbg(&chan->vc.chan.dev->device, 1093 "%s(): cancelling txd %p[%x] (completed=%d)", __func__, 1094 vd, vd->tx.cookie, is_desc_completed(vd)); 1095 } 1096 1097 phy = chan->phy; 1098 if (phy) { 1099 phy_disable(chan->phy); 1100 pxad_free_phy(chan); 1101 chan->phy = NULL; 1102 spin_lock(&pdev->phy_lock); 1103 phy->vchan = NULL; 1104 spin_unlock(&pdev->phy_lock); 1105 } 1106 spin_unlock_irqrestore(&chan->vc.lock, flags); 1107 vchan_dma_desc_free_list(&chan->vc, &head); 1108 1109 return 0; 1110 } 1111 1112 static unsigned int pxad_residue(struct pxad_chan *chan, 1113 dma_cookie_t cookie) 1114 { 1115 struct virt_dma_desc *vd = NULL; 1116 struct pxad_desc_sw *sw_desc = NULL; 1117 struct pxad_desc_hw *hw_desc = NULL; 1118 u32 curr, start, len, end, residue = 0; 1119 unsigned long flags; 1120 bool passed = false; 1121 int i; 1122 1123 /* 1124 * If the channel does not have a phy pointer anymore, it has already 1125 * been completed. Therefore, its residue is 0. 1126 */ 1127 if (!chan->phy) 1128 return 0; 1129 1130 spin_lock_irqsave(&chan->vc.lock, flags); 1131 1132 vd = vchan_find_desc(&chan->vc, cookie); 1133 if (!vd) 1134 goto out; 1135 1136 sw_desc = to_pxad_sw_desc(vd); 1137 if (sw_desc->hw_desc[0]->dcmd & PXA_DCMD_INCSRCADDR) 1138 curr = phy_readl_relaxed(chan->phy, DSADR); 1139 else 1140 curr = phy_readl_relaxed(chan->phy, DTADR); 1141 1142 /* 1143 * curr has to be actually read before checking descriptor 1144 * completion, so that a curr inside a status updater 1145 * descriptor implies the following test returns true, and 1146 * preventing reordering of curr load and the test. 1147 */ 1148 rmb(); 1149 if (is_desc_completed(vd)) 1150 goto out; 1151 1152 for (i = 0; i < sw_desc->nb_desc - 1; i++) { 1153 hw_desc = sw_desc->hw_desc[i]; 1154 if (sw_desc->hw_desc[0]->dcmd & PXA_DCMD_INCSRCADDR) 1155 start = hw_desc->dsadr; 1156 else 1157 start = hw_desc->dtadr; 1158 len = hw_desc->dcmd & PXA_DCMD_LENGTH; 1159 end = start + len; 1160 1161 /* 1162 * 'passed' will be latched once we found the descriptor 1163 * which lies inside the boundaries of the curr 1164 * pointer. All descriptors that occur in the list 1165 * _after_ we found that partially handled descriptor 1166 * are still to be processed and are hence added to the 1167 * residual bytes counter. 1168 */ 1169 1170 if (passed) { 1171 residue += len; 1172 } else if (curr >= start && curr <= end) { 1173 residue += end - curr; 1174 passed = true; 1175 } 1176 } 1177 if (!passed) 1178 residue = sw_desc->len; 1179 1180 out: 1181 spin_unlock_irqrestore(&chan->vc.lock, flags); 1182 dev_dbg(&chan->vc.chan.dev->device, 1183 "%s(): txd %p[%x] sw_desc=%p: %d\n", 1184 __func__, vd, cookie, sw_desc, residue); 1185 return residue; 1186 } 1187 1188 static enum dma_status pxad_tx_status(struct dma_chan *dchan, 1189 dma_cookie_t cookie, 1190 struct dma_tx_state *txstate) 1191 { 1192 struct pxad_chan *chan = to_pxad_chan(dchan); 1193 enum dma_status ret; 1194 1195 if (cookie == chan->bus_error) 1196 return DMA_ERROR; 1197 1198 ret = dma_cookie_status(dchan, cookie, txstate); 1199 if (likely(txstate && (ret != DMA_ERROR))) 1200 dma_set_residue(txstate, pxad_residue(chan, cookie)); 1201 1202 return ret; 1203 } 1204 1205 static void pxad_synchronize(struct dma_chan *dchan) 1206 { 1207 struct pxad_chan *chan = to_pxad_chan(dchan); 1208 1209 wait_event(chan->wq_state, !is_chan_running(chan)); 1210 vchan_synchronize(&chan->vc); 1211 } 1212 1213 static void pxad_free_channels(struct dma_device *dmadev) 1214 { 1215 struct pxad_chan *c, *cn; 1216 1217 list_for_each_entry_safe(c, cn, &dmadev->channels, 1218 vc.chan.device_node) { 1219 list_del(&c->vc.chan.device_node); 1220 tasklet_kill(&c->vc.task); 1221 } 1222 } 1223 1224 static int pxad_remove(struct platform_device *op) 1225 { 1226 struct pxad_device *pdev = platform_get_drvdata(op); 1227 1228 pxad_cleanup_debugfs(pdev); 1229 pxad_free_channels(&pdev->slave); 1230 return 0; 1231 } 1232 1233 static int pxad_init_phys(struct platform_device *op, 1234 struct pxad_device *pdev, 1235 unsigned int nb_phy_chans) 1236 { 1237 int irq0, irq, nr_irq = 0, i, ret; 1238 struct pxad_phy *phy; 1239 1240 irq0 = platform_get_irq(op, 0); 1241 if (irq0 < 0) 1242 return irq0; 1243 1244 pdev->phys = devm_kcalloc(&op->dev, nb_phy_chans, 1245 sizeof(pdev->phys[0]), GFP_KERNEL); 1246 if (!pdev->phys) 1247 return -ENOMEM; 1248 1249 for (i = 0; i < nb_phy_chans; i++) 1250 if (platform_get_irq_optional(op, i) > 0) 1251 nr_irq++; 1252 1253 for (i = 0; i < nb_phy_chans; i++) { 1254 phy = &pdev->phys[i]; 1255 phy->base = pdev->base; 1256 phy->idx = i; 1257 irq = platform_get_irq_optional(op, i); 1258 if ((nr_irq > 1) && (irq > 0)) 1259 ret = devm_request_irq(&op->dev, irq, 1260 pxad_chan_handler, 1261 IRQF_SHARED, "pxa-dma", phy); 1262 if ((nr_irq == 1) && (i == 0)) 1263 ret = devm_request_irq(&op->dev, irq0, 1264 pxad_int_handler, 1265 IRQF_SHARED, "pxa-dma", pdev); 1266 if (ret) { 1267 dev_err(pdev->slave.dev, 1268 "%s(): can't request irq %d:%d\n", __func__, 1269 irq, ret); 1270 return ret; 1271 } 1272 } 1273 1274 return 0; 1275 } 1276 1277 static const struct of_device_id pxad_dt_ids[] = { 1278 { .compatible = "marvell,pdma-1.0", }, 1279 {} 1280 }; 1281 MODULE_DEVICE_TABLE(of, pxad_dt_ids); 1282 1283 static struct dma_chan *pxad_dma_xlate(struct of_phandle_args *dma_spec, 1284 struct of_dma *ofdma) 1285 { 1286 struct pxad_device *d = ofdma->of_dma_data; 1287 struct dma_chan *chan; 1288 1289 chan = dma_get_any_slave_channel(&d->slave); 1290 if (!chan) 1291 return NULL; 1292 1293 to_pxad_chan(chan)->drcmr = dma_spec->args[0]; 1294 to_pxad_chan(chan)->prio = dma_spec->args[1]; 1295 1296 return chan; 1297 } 1298 1299 static int pxad_init_dmadev(struct platform_device *op, 1300 struct pxad_device *pdev, 1301 unsigned int nr_phy_chans, 1302 unsigned int nr_requestors) 1303 { 1304 int ret; 1305 unsigned int i; 1306 struct pxad_chan *c; 1307 1308 pdev->nr_chans = nr_phy_chans; 1309 pdev->nr_requestors = nr_requestors; 1310 INIT_LIST_HEAD(&pdev->slave.channels); 1311 pdev->slave.device_alloc_chan_resources = pxad_alloc_chan_resources; 1312 pdev->slave.device_free_chan_resources = pxad_free_chan_resources; 1313 pdev->slave.device_tx_status = pxad_tx_status; 1314 pdev->slave.device_issue_pending = pxad_issue_pending; 1315 pdev->slave.device_config = pxad_config; 1316 pdev->slave.device_synchronize = pxad_synchronize; 1317 pdev->slave.device_terminate_all = pxad_terminate_all; 1318 1319 if (op->dev.coherent_dma_mask) 1320 dma_set_mask(&op->dev, op->dev.coherent_dma_mask); 1321 else 1322 dma_set_mask(&op->dev, DMA_BIT_MASK(32)); 1323 1324 ret = pxad_init_phys(op, pdev, nr_phy_chans); 1325 if (ret) 1326 return ret; 1327 1328 for (i = 0; i < nr_phy_chans; i++) { 1329 c = devm_kzalloc(&op->dev, sizeof(*c), GFP_KERNEL); 1330 if (!c) 1331 return -ENOMEM; 1332 1333 c->drcmr = U32_MAX; 1334 c->prio = PXAD_PRIO_LOWEST; 1335 c->vc.desc_free = pxad_free_desc; 1336 vchan_init(&c->vc, &pdev->slave); 1337 init_waitqueue_head(&c->wq_state); 1338 } 1339 1340 return dmaenginem_async_device_register(&pdev->slave); 1341 } 1342 1343 static int pxad_probe(struct platform_device *op) 1344 { 1345 struct pxad_device *pdev; 1346 const struct of_device_id *of_id; 1347 const struct dma_slave_map *slave_map = NULL; 1348 struct mmp_dma_platdata *pdata = dev_get_platdata(&op->dev); 1349 struct resource *iores; 1350 int ret, dma_channels = 0, nb_requestors = 0, slave_map_cnt = 0; 1351 const enum dma_slave_buswidth widths = 1352 DMA_SLAVE_BUSWIDTH_1_BYTE | DMA_SLAVE_BUSWIDTH_2_BYTES | 1353 DMA_SLAVE_BUSWIDTH_4_BYTES; 1354 1355 pdev = devm_kzalloc(&op->dev, sizeof(*pdev), GFP_KERNEL); 1356 if (!pdev) 1357 return -ENOMEM; 1358 1359 spin_lock_init(&pdev->phy_lock); 1360 1361 iores = platform_get_resource(op, IORESOURCE_MEM, 0); 1362 pdev->base = devm_ioremap_resource(&op->dev, iores); 1363 if (IS_ERR(pdev->base)) 1364 return PTR_ERR(pdev->base); 1365 1366 of_id = of_match_device(pxad_dt_ids, &op->dev); 1367 if (of_id) { 1368 /* Parse new and deprecated dma-channels properties */ 1369 if (of_property_read_u32(op->dev.of_node, "dma-channels", 1370 &dma_channels)) 1371 of_property_read_u32(op->dev.of_node, "#dma-channels", 1372 &dma_channels); 1373 /* Parse new and deprecated dma-requests properties */ 1374 ret = of_property_read_u32(op->dev.of_node, "dma-requests", 1375 &nb_requestors); 1376 if (ret) 1377 ret = of_property_read_u32(op->dev.of_node, "#dma-requests", 1378 &nb_requestors); 1379 if (ret) { 1380 dev_warn(pdev->slave.dev, 1381 "#dma-requests set to default 32 as missing in OF: %d", 1382 ret); 1383 nb_requestors = 32; 1384 } 1385 } else if (pdata && pdata->dma_channels) { 1386 dma_channels = pdata->dma_channels; 1387 nb_requestors = pdata->nb_requestors; 1388 slave_map = pdata->slave_map; 1389 slave_map_cnt = pdata->slave_map_cnt; 1390 } else { 1391 dma_channels = 32; /* default 32 channel */ 1392 } 1393 1394 dma_cap_set(DMA_SLAVE, pdev->slave.cap_mask); 1395 dma_cap_set(DMA_MEMCPY, pdev->slave.cap_mask); 1396 dma_cap_set(DMA_CYCLIC, pdev->slave.cap_mask); 1397 dma_cap_set(DMA_PRIVATE, pdev->slave.cap_mask); 1398 pdev->slave.device_prep_dma_memcpy = pxad_prep_memcpy; 1399 pdev->slave.device_prep_slave_sg = pxad_prep_slave_sg; 1400 pdev->slave.device_prep_dma_cyclic = pxad_prep_dma_cyclic; 1401 pdev->slave.filter.map = slave_map; 1402 pdev->slave.filter.mapcnt = slave_map_cnt; 1403 pdev->slave.filter.fn = pxad_filter_fn; 1404 1405 pdev->slave.copy_align = PDMA_ALIGNMENT; 1406 pdev->slave.src_addr_widths = widths; 1407 pdev->slave.dst_addr_widths = widths; 1408 pdev->slave.directions = BIT(DMA_MEM_TO_DEV) | BIT(DMA_DEV_TO_MEM); 1409 pdev->slave.residue_granularity = DMA_RESIDUE_GRANULARITY_DESCRIPTOR; 1410 pdev->slave.descriptor_reuse = true; 1411 1412 pdev->slave.dev = &op->dev; 1413 ret = pxad_init_dmadev(op, pdev, dma_channels, nb_requestors); 1414 if (ret) { 1415 dev_err(pdev->slave.dev, "unable to register\n"); 1416 return ret; 1417 } 1418 1419 if (op->dev.of_node) { 1420 /* Device-tree DMA controller registration */ 1421 ret = of_dma_controller_register(op->dev.of_node, 1422 pxad_dma_xlate, pdev); 1423 if (ret < 0) { 1424 dev_err(pdev->slave.dev, 1425 "of_dma_controller_register failed\n"); 1426 return ret; 1427 } 1428 } 1429 1430 platform_set_drvdata(op, pdev); 1431 pxad_init_debugfs(pdev); 1432 dev_info(pdev->slave.dev, "initialized %d channels on %d requestors\n", 1433 dma_channels, nb_requestors); 1434 return 0; 1435 } 1436 1437 static const struct platform_device_id pxad_id_table[] = { 1438 { "pxa-dma", }, 1439 { }, 1440 }; 1441 1442 static struct platform_driver pxad_driver = { 1443 .driver = { 1444 .name = "pxa-dma", 1445 .of_match_table = pxad_dt_ids, 1446 }, 1447 .id_table = pxad_id_table, 1448 .probe = pxad_probe, 1449 .remove = pxad_remove, 1450 }; 1451 1452 static bool pxad_filter_fn(struct dma_chan *chan, void *param) 1453 { 1454 struct pxad_chan *c = to_pxad_chan(chan); 1455 struct pxad_param *p = param; 1456 1457 if (chan->device->dev->driver != &pxad_driver.driver) 1458 return false; 1459 1460 c->drcmr = p->drcmr; 1461 c->prio = p->prio; 1462 1463 return true; 1464 } 1465 1466 module_platform_driver(pxad_driver); 1467 1468 MODULE_DESCRIPTION("Marvell PXA Peripheral DMA Driver"); 1469 MODULE_AUTHOR("Robert Jarzmik <robert.jarzmik@free.fr>"); 1470 MODULE_LICENSE("GPL v2"); 1471