1 /* SPDX-License-Identifier: GPL-2.0+ */ 2 /* 3 * Copyright 2013-2014 Freescale Semiconductor, Inc. 4 * Copyright 2018 Angelo Dureghello <angelo@sysam.it> 5 */ 6 #ifndef _FSL_EDMA_COMMON_H_ 7 #define _FSL_EDMA_COMMON_H_ 8 9 #include <linux/dma-direction.h> 10 #include <linux/platform_device.h> 11 #include "virt-dma.h" 12 13 #define EDMA_CR_EDBG BIT(1) 14 #define EDMA_CR_ERCA BIT(2) 15 #define EDMA_CR_ERGA BIT(3) 16 #define EDMA_CR_HOE BIT(4) 17 #define EDMA_CR_HALT BIT(5) 18 #define EDMA_CR_CLM BIT(6) 19 #define EDMA_CR_EMLM BIT(7) 20 #define EDMA_CR_ECX BIT(16) 21 #define EDMA_CR_CX BIT(17) 22 23 #define EDMA_SEEI_SEEI(x) ((x) & GENMASK(4, 0)) 24 #define EDMA_CEEI_CEEI(x) ((x) & GENMASK(4, 0)) 25 #define EDMA_CINT_CINT(x) ((x) & GENMASK(4, 0)) 26 #define EDMA_CERR_CERR(x) ((x) & GENMASK(4, 0)) 27 28 #define EDMA_TCD_ATTR_DSIZE(x) (((x) & GENMASK(2, 0))) 29 #define EDMA_TCD_ATTR_DMOD(x) (((x) & GENMASK(4, 0)) << 3) 30 #define EDMA_TCD_ATTR_SSIZE(x) (((x) & GENMASK(2, 0)) << 8) 31 #define EDMA_TCD_ATTR_SMOD(x) (((x) & GENMASK(4, 0)) << 11) 32 33 #define EDMA_TCD_ITER_MASK GENMASK(14, 0) 34 #define EDMA_TCD_CITER_CITER(x) ((x) & EDMA_TCD_ITER_MASK) 35 #define EDMA_TCD_BITER_BITER(x) ((x) & EDMA_TCD_ITER_MASK) 36 37 #define EDMA_TCD_CSR_START BIT(0) 38 #define EDMA_TCD_CSR_INT_MAJOR BIT(1) 39 #define EDMA_TCD_CSR_INT_HALF BIT(2) 40 #define EDMA_TCD_CSR_D_REQ BIT(3) 41 #define EDMA_TCD_CSR_E_SG BIT(4) 42 #define EDMA_TCD_CSR_E_LINK BIT(5) 43 #define EDMA_TCD_CSR_ACTIVE BIT(6) 44 #define EDMA_TCD_CSR_DONE BIT(7) 45 46 #define EDMA_V3_TCD_NBYTES_MLOFF_NBYTES(x) ((x) & GENMASK(9, 0)) 47 #define EDMA_V3_TCD_NBYTES_MLOFF(x) (x << 10) 48 #define EDMA_V3_TCD_NBYTES_DMLOE (1 << 30) 49 #define EDMA_V3_TCD_NBYTES_SMLOE (1 << 31) 50 51 #define EDMAMUX_CHCFG_DIS 0x0 52 #define EDMAMUX_CHCFG_ENBL 0x80 53 #define EDMAMUX_CHCFG_SOURCE(n) ((n) & 0x3F) 54 55 #define DMAMUX_NR 2 56 57 #define EDMA_TCD 0x1000 58 59 #define FSL_EDMA_BUSWIDTHS (BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \ 60 BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \ 61 BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) | \ 62 BIT(DMA_SLAVE_BUSWIDTH_8_BYTES)) 63 64 #define EDMA_V3_CH_SBR_RD BIT(22) 65 #define EDMA_V3_CH_SBR_WR BIT(21) 66 #define EDMA_V3_CH_CSR_ERQ BIT(0) 67 #define EDMA_V3_CH_CSR_EARQ BIT(1) 68 #define EDMA_V3_CH_CSR_EEI BIT(2) 69 #define EDMA_V3_CH_CSR_DONE BIT(30) 70 #define EDMA_V3_CH_CSR_ACTIVE BIT(31) 71 72 enum fsl_edma_pm_state { 73 RUNNING = 0, 74 SUSPENDED, 75 }; 76 77 struct fsl_edma_hw_tcd { 78 __le32 saddr; 79 __le16 soff; 80 __le16 attr; 81 __le32 nbytes; 82 __le32 slast; 83 __le32 daddr; 84 __le16 doff; 85 __le16 citer; 86 __le32 dlast_sga; 87 __le16 csr; 88 __le16 biter; 89 }; 90 91 struct fsl_edma_hw_tcd64 { 92 __le64 saddr; 93 __le16 soff; 94 __le16 attr; 95 __le32 nbytes; 96 __le64 slast; 97 __le64 daddr; 98 __le64 dlast_sga; 99 __le16 doff; 100 __le16 citer; 101 __le16 csr; 102 __le16 biter; 103 } __packed; 104 105 struct fsl_edma3_ch_reg { 106 __le32 ch_csr; 107 __le32 ch_es; 108 __le32 ch_int; 109 __le32 ch_sbr; 110 __le32 ch_pri; 111 __le32 ch_mux; 112 __le32 ch_mattr; /* edma4, reserved for edma3 */ 113 __le32 ch_reserved; 114 union { 115 struct fsl_edma_hw_tcd tcd; 116 struct fsl_edma_hw_tcd64 tcd64; 117 }; 118 } __packed; 119 120 /* 121 * These are iomem pointers, for both v32 and v64. 122 */ 123 struct edma_regs { 124 void __iomem *cr; 125 void __iomem *es; 126 void __iomem *erqh; 127 void __iomem *erql; /* aka erq on v32 */ 128 void __iomem *eeih; 129 void __iomem *eeil; /* aka eei on v32 */ 130 void __iomem *seei; 131 void __iomem *ceei; 132 void __iomem *serq; 133 void __iomem *cerq; 134 void __iomem *cint; 135 void __iomem *cerr; 136 void __iomem *ssrt; 137 void __iomem *cdne; 138 void __iomem *inth; 139 void __iomem *intl; 140 void __iomem *errh; 141 void __iomem *errl; 142 }; 143 144 struct fsl_edma_sw_tcd { 145 dma_addr_t ptcd; 146 void *vtcd; 147 }; 148 149 struct fsl_edma_chan { 150 struct virt_dma_chan vchan; 151 enum dma_status status; 152 enum fsl_edma_pm_state pm_state; 153 bool idle; 154 struct fsl_edma_engine *edma; 155 struct fsl_edma_desc *edesc; 156 struct dma_slave_config cfg; 157 u32 attr; 158 bool is_sw; 159 struct dma_pool *tcd_pool; 160 dma_addr_t dma_dev_addr; 161 u32 dma_dev_size; 162 enum dma_data_direction dma_dir; 163 char chan_name[32]; 164 void __iomem *tcd; 165 void __iomem *mux_addr; 166 u32 real_count; 167 struct work_struct issue_worker; 168 struct platform_device *pdev; 169 struct device *pd_dev; 170 u32 srcid; 171 struct clk *clk; 172 int priority; 173 int hw_chanid; 174 int txirq; 175 bool is_rxchan; 176 bool is_remote; 177 bool is_multi_fifo; 178 }; 179 180 struct fsl_edma_desc { 181 struct virt_dma_desc vdesc; 182 struct fsl_edma_chan *echan; 183 bool iscyclic; 184 enum dma_transfer_direction dirn; 185 unsigned int n_tcds; 186 struct fsl_edma_sw_tcd tcd[]; 187 }; 188 189 #define FSL_EDMA_DRV_HAS_DMACLK BIT(0) 190 #define FSL_EDMA_DRV_MUX_SWAP BIT(1) 191 #define FSL_EDMA_DRV_CONFIG32 BIT(2) 192 #define FSL_EDMA_DRV_WRAP_IO BIT(3) 193 #define FSL_EDMA_DRV_EDMA64 BIT(4) 194 #define FSL_EDMA_DRV_HAS_PD BIT(5) 195 #define FSL_EDMA_DRV_HAS_CHCLK BIT(6) 196 #define FSL_EDMA_DRV_HAS_CHMUX BIT(7) 197 /* control and status register is in tcd address space, edma3 reg layout */ 198 #define FSL_EDMA_DRV_SPLIT_REG BIT(9) 199 #define FSL_EDMA_DRV_BUS_8BYTE BIT(10) 200 #define FSL_EDMA_DRV_DEV_TO_DEV BIT(11) 201 #define FSL_EDMA_DRV_ALIGN_64BYTE BIT(12) 202 /* Need clean CHn_CSR DONE before enable TCD's ESG */ 203 #define FSL_EDMA_DRV_CLEAR_DONE_E_SG BIT(13) 204 /* Need clean CHn_CSR DONE before enable TCD's MAJORELINK */ 205 #define FSL_EDMA_DRV_CLEAR_DONE_E_LINK BIT(14) 206 #define FSL_EDMA_DRV_TCD64 BIT(15) 207 208 #define FSL_EDMA_DRV_EDMA3 (FSL_EDMA_DRV_SPLIT_REG | \ 209 FSL_EDMA_DRV_BUS_8BYTE | \ 210 FSL_EDMA_DRV_DEV_TO_DEV | \ 211 FSL_EDMA_DRV_ALIGN_64BYTE | \ 212 FSL_EDMA_DRV_CLEAR_DONE_E_SG | \ 213 FSL_EDMA_DRV_CLEAR_DONE_E_LINK) 214 215 #define FSL_EDMA_DRV_EDMA4 (FSL_EDMA_DRV_SPLIT_REG | \ 216 FSL_EDMA_DRV_BUS_8BYTE | \ 217 FSL_EDMA_DRV_DEV_TO_DEV | \ 218 FSL_EDMA_DRV_ALIGN_64BYTE | \ 219 FSL_EDMA_DRV_CLEAR_DONE_E_LINK) 220 221 struct fsl_edma_drvdata { 222 u32 dmamuxs; /* only used before v3 */ 223 u32 chreg_off; 224 u32 chreg_space_sz; 225 u32 flags; 226 u32 mux_off; /* channel mux register offset */ 227 u32 mux_skip; /* how much skip for each channel */ 228 int (*setup_irq)(struct platform_device *pdev, 229 struct fsl_edma_engine *fsl_edma); 230 }; 231 232 struct fsl_edma_engine { 233 struct dma_device dma_dev; 234 void __iomem *membase; 235 void __iomem *muxbase[DMAMUX_NR]; 236 struct clk *muxclk[DMAMUX_NR]; 237 struct clk *dmaclk; 238 struct mutex fsl_edma_mutex; 239 const struct fsl_edma_drvdata *drvdata; 240 u32 n_chans; 241 int txirq; 242 int errirq; 243 bool big_endian; 244 struct edma_regs regs; 245 u64 chan_masked; 246 struct fsl_edma_chan chans[] __counted_by(n_chans); 247 }; 248 249 static inline u32 fsl_edma_drvflags(struct fsl_edma_chan *fsl_chan) 250 { 251 return fsl_chan->edma->drvdata->flags; 252 } 253 254 #define edma_read_tcdreg_c(chan, _tcd, __name) \ 255 _Generic(((_tcd)->__name), \ 256 __iomem __le64 : edma_readq(chan->edma, &(_tcd)->__name), \ 257 __iomem __le32 : edma_readl(chan->edma, &(_tcd)->__name), \ 258 __iomem __le16 : edma_readw(chan->edma, &(_tcd)->__name) \ 259 ) 260 261 #define edma_read_tcdreg(chan, __name) \ 262 ((fsl_edma_drvflags(chan) & FSL_EDMA_DRV_TCD64) ? \ 263 edma_read_tcdreg_c(chan, ((struct fsl_edma_hw_tcd64 __iomem *)chan->tcd), __name) : \ 264 edma_read_tcdreg_c(chan, ((struct fsl_edma_hw_tcd __iomem *)chan->tcd), __name) \ 265 ) 266 267 #define edma_write_tcdreg_c(chan, _tcd, _val, __name) \ 268 _Generic((_tcd->__name), \ 269 __iomem __le64 : edma_writeq(chan->edma, (u64 __force)(_val), &_tcd->__name), \ 270 __iomem __le32 : edma_writel(chan->edma, (u32 __force)(_val), &_tcd->__name), \ 271 __iomem __le16 : edma_writew(chan->edma, (u16 __force)(_val), &_tcd->__name), \ 272 __iomem u8 : edma_writeb(chan->edma, _val, &_tcd->__name) \ 273 ) 274 275 #define edma_write_tcdreg(chan, val, __name) \ 276 do { \ 277 struct fsl_edma_hw_tcd64 __iomem *tcd64_r = (struct fsl_edma_hw_tcd64 __iomem *)chan->tcd; \ 278 struct fsl_edma_hw_tcd __iomem *tcd_r = (struct fsl_edma_hw_tcd __iomem *)chan->tcd; \ 279 \ 280 if (fsl_edma_drvflags(chan) & FSL_EDMA_DRV_TCD64) \ 281 edma_write_tcdreg_c(chan, tcd64_r, val, __name); \ 282 else \ 283 edma_write_tcdreg_c(chan, tcd_r, val, __name); \ 284 } while (0) 285 286 #define edma_cp_tcd_to_reg(chan, __tcd, __name) \ 287 do { \ 288 struct fsl_edma_hw_tcd64 __iomem *tcd64_r = (struct fsl_edma_hw_tcd64 __iomem *)chan->tcd; \ 289 struct fsl_edma_hw_tcd __iomem *tcd_r = (struct fsl_edma_hw_tcd __iomem *)chan->tcd; \ 290 struct fsl_edma_hw_tcd64 *tcd64_m = (struct fsl_edma_hw_tcd64 *)__tcd; \ 291 struct fsl_edma_hw_tcd *tcd_m = (struct fsl_edma_hw_tcd *)__tcd; \ 292 \ 293 if (fsl_edma_drvflags(chan) & FSL_EDMA_DRV_TCD64) \ 294 edma_write_tcdreg_c(chan, tcd64_r, tcd64_m->__name, __name); \ 295 else \ 296 edma_write_tcdreg_c(chan, tcd_r, tcd_m->__name, __name); \ 297 } while (0) 298 299 #define edma_readl_chreg(chan, __name) \ 300 edma_readl(chan->edma, \ 301 (void __iomem *)&(container_of(((__force void *)chan->tcd),\ 302 struct fsl_edma3_ch_reg, tcd)->__name)) 303 304 #define edma_writel_chreg(chan, val, __name) \ 305 edma_writel(chan->edma, val, \ 306 (void __iomem *)&(container_of(((__force void *)chan->tcd),\ 307 struct fsl_edma3_ch_reg, tcd)->__name)) 308 309 #define fsl_edma_get_tcd(_chan, _tcd, _field) \ 310 (fsl_edma_drvflags(_chan) & FSL_EDMA_DRV_TCD64 ? (((struct fsl_edma_hw_tcd64 *)_tcd)->_field) : \ 311 (((struct fsl_edma_hw_tcd *)_tcd)->_field)) 312 313 #define fsl_edma_le_to_cpu(x) \ 314 _Generic((x), \ 315 __le64 : le64_to_cpu((x)), \ 316 __le32 : le32_to_cpu((x)), \ 317 __le16 : le16_to_cpu((x)) \ 318 ) 319 320 #define fsl_edma_get_tcd_to_cpu(_chan, _tcd, _field) \ 321 (fsl_edma_drvflags(_chan) & FSL_EDMA_DRV_TCD64 ? \ 322 fsl_edma_le_to_cpu(((struct fsl_edma_hw_tcd64 *)_tcd)->_field) : \ 323 fsl_edma_le_to_cpu(((struct fsl_edma_hw_tcd *)_tcd)->_field)) 324 325 #define fsl_edma_set_tcd_to_le_c(_tcd, _val, _field) \ 326 _Generic(((_tcd)->_field), \ 327 __le64 : (_tcd)->_field = cpu_to_le64(_val), \ 328 __le32 : (_tcd)->_field = cpu_to_le32(_val), \ 329 __le16 : (_tcd)->_field = cpu_to_le16(_val) \ 330 ) 331 332 #define fsl_edma_set_tcd_to_le(_chan, _tcd, _val, _field) \ 333 do { \ 334 if (fsl_edma_drvflags(_chan) & FSL_EDMA_DRV_TCD64) \ 335 fsl_edma_set_tcd_to_le_c((struct fsl_edma_hw_tcd64 *)_tcd, _val, _field); \ 336 else \ 337 fsl_edma_set_tcd_to_le_c((struct fsl_edma_hw_tcd *)_tcd, _val, _field); \ 338 } while (0) 339 340 /* Need after struct defination */ 341 #include "fsl-edma-trace.h" 342 343 /* 344 * R/W functions for big- or little-endian registers: 345 * The eDMA controller's endian is independent of the CPU core's endian. 346 * For the big-endian IP module, the offset for 8-bit or 16-bit registers 347 * should also be swapped opposite to that in little-endian IP. 348 */ 349 static inline u64 edma_readq(struct fsl_edma_engine *edma, void __iomem *addr) 350 { 351 u64 l, h; 352 353 if (edma->big_endian) { 354 l = ioread32be(addr); 355 h = ioread32be(addr + 4); 356 } else { 357 l = ioread32(addr); 358 h = ioread32(addr + 4); 359 } 360 361 trace_edma_readl(edma, addr, l); 362 trace_edma_readl(edma, addr + 4, h); 363 364 return (h << 32) | l; 365 } 366 367 static inline u32 edma_readl(struct fsl_edma_engine *edma, void __iomem *addr) 368 { 369 u32 val; 370 371 if (edma->big_endian) 372 val = ioread32be(addr); 373 else 374 val = ioread32(addr); 375 376 trace_edma_readl(edma, addr, val); 377 378 return val; 379 } 380 381 static inline u16 edma_readw(struct fsl_edma_engine *edma, void __iomem *addr) 382 { 383 u16 val; 384 385 if (edma->big_endian) 386 val = ioread16be(addr); 387 else 388 val = ioread16(addr); 389 390 trace_edma_readw(edma, addr, val); 391 392 return val; 393 } 394 395 static inline void edma_writeb(struct fsl_edma_engine *edma, 396 u8 val, void __iomem *addr) 397 { 398 /* swap the reg offset for these in big-endian mode */ 399 if (edma->big_endian) 400 iowrite8(val, (void __iomem *)((unsigned long)addr ^ 0x3)); 401 else 402 iowrite8(val, addr); 403 404 trace_edma_writeb(edma, addr, val); 405 } 406 407 static inline void edma_writew(struct fsl_edma_engine *edma, 408 u16 val, void __iomem *addr) 409 { 410 /* swap the reg offset for these in big-endian mode */ 411 if (edma->big_endian) 412 iowrite16be(val, (void __iomem *)((unsigned long)addr ^ 0x2)); 413 else 414 iowrite16(val, addr); 415 416 trace_edma_writew(edma, addr, val); 417 } 418 419 static inline void edma_writel(struct fsl_edma_engine *edma, 420 u32 val, void __iomem *addr) 421 { 422 if (edma->big_endian) 423 iowrite32be(val, addr); 424 else 425 iowrite32(val, addr); 426 427 trace_edma_writel(edma, addr, val); 428 } 429 430 static inline void edma_writeq(struct fsl_edma_engine *edma, 431 u64 val, void __iomem *addr) 432 { 433 if (edma->big_endian) { 434 iowrite32be(val & 0xFFFFFFFF, addr); 435 iowrite32be(val >> 32, addr + 4); 436 } else { 437 iowrite32(val & 0xFFFFFFFF, addr); 438 iowrite32(val >> 32, addr + 4); 439 } 440 441 trace_edma_writel(edma, addr, val & 0xFFFFFFFF); 442 trace_edma_writel(edma, addr + 4, val >> 32); 443 } 444 445 static inline struct fsl_edma_chan *to_fsl_edma_chan(struct dma_chan *chan) 446 { 447 return container_of(chan, struct fsl_edma_chan, vchan.chan); 448 } 449 450 static inline struct fsl_edma_desc *to_fsl_edma_desc(struct virt_dma_desc *vd) 451 { 452 return container_of(vd, struct fsl_edma_desc, vdesc); 453 } 454 455 static inline void fsl_edma_err_chan_handler(struct fsl_edma_chan *fsl_chan) 456 { 457 fsl_chan->status = DMA_ERROR; 458 fsl_chan->idle = true; 459 } 460 461 void fsl_edma_tx_chan_handler(struct fsl_edma_chan *fsl_chan); 462 void fsl_edma_disable_request(struct fsl_edma_chan *fsl_chan); 463 void fsl_edma_chan_mux(struct fsl_edma_chan *fsl_chan, 464 unsigned int slot, bool enable); 465 void fsl_edma_free_desc(struct virt_dma_desc *vdesc); 466 int fsl_edma_terminate_all(struct dma_chan *chan); 467 int fsl_edma_pause(struct dma_chan *chan); 468 int fsl_edma_resume(struct dma_chan *chan); 469 int fsl_edma_slave_config(struct dma_chan *chan, 470 struct dma_slave_config *cfg); 471 enum dma_status fsl_edma_tx_status(struct dma_chan *chan, 472 dma_cookie_t cookie, struct dma_tx_state *txstate); 473 struct dma_async_tx_descriptor *fsl_edma_prep_dma_cyclic( 474 struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len, 475 size_t period_len, enum dma_transfer_direction direction, 476 unsigned long flags); 477 struct dma_async_tx_descriptor *fsl_edma_prep_slave_sg( 478 struct dma_chan *chan, struct scatterlist *sgl, 479 unsigned int sg_len, enum dma_transfer_direction direction, 480 unsigned long flags, void *context); 481 struct dma_async_tx_descriptor *fsl_edma_prep_memcpy( 482 struct dma_chan *chan, dma_addr_t dma_dst, dma_addr_t dma_src, 483 size_t len, unsigned long flags); 484 void fsl_edma_xfer_desc(struct fsl_edma_chan *fsl_chan); 485 void fsl_edma_issue_pending(struct dma_chan *chan); 486 int fsl_edma_alloc_chan_resources(struct dma_chan *chan); 487 void fsl_edma_free_chan_resources(struct dma_chan *chan); 488 void fsl_edma_cleanup_vchan(struct dma_device *dmadev); 489 void fsl_edma_setup_regs(struct fsl_edma_engine *edma); 490 491 #endif /* _FSL_EDMA_COMMON_H_ */ 492