drivers/dma/fsl-edma-common.h

   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         struct fsl_edma_engine          *edma;
 154         struct fsl_edma_desc            *edesc;
 155         struct dma_slave_config         cfg;
 156         u32                             attr;
 157         bool                            is_sw;
 158         struct dma_pool                 *tcd_pool;
 159         dma_addr_t                      dma_dev_addr;
 160         u32                             dma_dev_size;
 161         enum dma_data_direction         dma_dir;
 162         char                            chan_name[32];
 163         void __iomem                    *tcd;
 164         void __iomem                    *mux_addr;
 165         u32                             real_count;
 166         struct work_struct              issue_worker;
 167         struct platform_device          *pdev;
 168         struct device                   *pd_dev;
 169         u32                             srcid;
 170         struct clk                      *clk;
 171         int                             priority;
 172         int                             hw_chanid;
 173         int                             txirq;
 174         irqreturn_t                     (*irq_handler)(int irq, void *dev_id);
 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 #define FSL_EDMA_DRV_MEM_REMOTE         BIT(8)
 198 /* control and status register is in tcd address space, edma3 reg layout */
 199 #define FSL_EDMA_DRV_SPLIT_REG          BIT(9)
 200 #define FSL_EDMA_DRV_BUS_8BYTE          BIT(10)
 201 #define FSL_EDMA_DRV_DEV_TO_DEV         BIT(11)
 202 #define FSL_EDMA_DRV_ALIGN_64BYTE       BIT(12)
 203 /* Need clean CHn_CSR DONE before enable TCD's ESG */
 204 #define FSL_EDMA_DRV_CLEAR_DONE_E_SG    BIT(13)
 205 /* Need clean CHn_CSR DONE before enable TCD's MAJORELINK */
 206 #define FSL_EDMA_DRV_CLEAR_DONE_E_LINK  BIT(14)
 207 #define FSL_EDMA_DRV_TCD64              BIT(15)
 208
 209 #define FSL_EDMA_DRV_EDMA3      (FSL_EDMA_DRV_SPLIT_REG |       \
 210                                  FSL_EDMA_DRV_BUS_8BYTE |       \
 211                                  FSL_EDMA_DRV_DEV_TO_DEV |      \
 212                                  FSL_EDMA_DRV_ALIGN_64BYTE |    \
 213                                  FSL_EDMA_DRV_CLEAR_DONE_E_SG | \
 214                                  FSL_EDMA_DRV_CLEAR_DONE_E_LINK)
 215
 216 #define FSL_EDMA_DRV_EDMA4      (FSL_EDMA_DRV_SPLIT_REG |       \
 217                                  FSL_EDMA_DRV_BUS_8BYTE |       \
 218                                  FSL_EDMA_DRV_DEV_TO_DEV |      \
 219                                  FSL_EDMA_DRV_ALIGN_64BYTE |    \
 220                                  FSL_EDMA_DRV_CLEAR_DONE_E_LINK)
 221
 222 struct fsl_edma_drvdata {
 223         u32                     dmamuxs; /* only used before v3 */
 224         u32                     chreg_off;
 225         u32                     chreg_space_sz;
 226         u32                     flags;
 227         u32                     mux_off;        /* channel mux register offset */
 228         u32                     mux_skip;       /* how much skip for each channel */
 229         int                     (*setup_irq)(struct platform_device *pdev,
 230                                              struct fsl_edma_engine *fsl_edma);
 231 };
 232
 233 struct fsl_edma_engine {
 234         struct dma_device       dma_dev;
 235         void __iomem            *membase;
 236         void __iomem            *muxbase[DMAMUX_NR];
 237         struct clk              *muxclk[DMAMUX_NR];
 238         struct clk              *dmaclk;
 239         struct mutex            fsl_edma_mutex;
 240         const struct fsl_edma_drvdata *drvdata;
 241         u32                     n_chans;
 242         int                     txirq;
 243         int                     errirq;
 244         bool                    big_endian;
 245         struct edma_regs        regs;
 246         u64                     chan_masked;
 247         struct fsl_edma_chan    chans[] __counted_by(n_chans);
 248 };
 249
 250 static inline u32 fsl_edma_drvflags(struct fsl_edma_chan *fsl_chan)
 251 {
 252         return fsl_chan->edma->drvdata->flags;
 253 }
 254
 255 #define edma_read_tcdreg_c(chan, _tcd,  __name)                         \
 256 _Generic(((_tcd)->__name),                                              \
 257         __iomem __le64 : edma_readq(chan->edma, &(_tcd)->__name),               \
 258         __iomem __le32 : edma_readl(chan->edma, &(_tcd)->__name),               \
 259         __iomem __le16 : edma_readw(chan->edma, &(_tcd)->__name)                \
 260         )
 261
 262 #define edma_read_tcdreg(chan, __name)                                                          \
 263 ((fsl_edma_drvflags(chan) & FSL_EDMA_DRV_TCD64) ?                                               \
 264         edma_read_tcdreg_c(chan, ((struct fsl_edma_hw_tcd64 __iomem *)chan->tcd), __name) :     \
 265         edma_read_tcdreg_c(chan, ((struct fsl_edma_hw_tcd __iomem *)chan->tcd), __name)         \
 266 )
 267
 268 #define edma_write_tcdreg_c(chan, _tcd, _val, __name)                                   \
 269 _Generic((_tcd->__name),                                                                \
 270         __iomem __le64 : edma_writeq(chan->edma, (u64 __force)(_val), &_tcd->__name),   \
 271         __iomem __le32 : edma_writel(chan->edma, (u32 __force)(_val), &_tcd->__name),   \
 272         __iomem __le16 : edma_writew(chan->edma, (u16 __force)(_val), &_tcd->__name),   \
 273         __iomem u8 : edma_writeb(chan->edma, _val, &_tcd->__name)                       \
 274         )
 275
 276 #define edma_write_tcdreg(chan, val, __name)                                                       \
 277 do {                                                                                               \
 278         struct fsl_edma_hw_tcd64 __iomem *tcd64_r = (struct fsl_edma_hw_tcd64 __iomem *)chan->tcd; \
 279         struct fsl_edma_hw_tcd __iomem *tcd_r = (struct fsl_edma_hw_tcd __iomem *)chan->tcd;       \
 280                                                                                                    \
 281         if (fsl_edma_drvflags(chan) & FSL_EDMA_DRV_TCD64)                                          \
 282                 edma_write_tcdreg_c(chan, tcd64_r, val, __name);                                   \
 283         else                                                                                       \
 284                 edma_write_tcdreg_c(chan, tcd_r, val, __name);                                     \
 285 } while (0)
 286
 287 #define edma_cp_tcd_to_reg(chan, __tcd, __name)                                                    \
 288 do {    \
 289         struct fsl_edma_hw_tcd64 __iomem *tcd64_r = (struct fsl_edma_hw_tcd64 __iomem *)chan->tcd; \
 290         struct fsl_edma_hw_tcd __iomem *tcd_r = (struct fsl_edma_hw_tcd __iomem *)chan->tcd;       \
 291         struct fsl_edma_hw_tcd64 *tcd64_m = (struct fsl_edma_hw_tcd64 *)__tcd;                     \
 292         struct fsl_edma_hw_tcd *tcd_m = (struct fsl_edma_hw_tcd *)__tcd;                           \
 293                                                                                                    \
 294         if (fsl_edma_drvflags(chan) & FSL_EDMA_DRV_TCD64)                                          \
 295                 edma_write_tcdreg_c(chan, tcd64_r,  tcd64_m->__name, __name);                      \
 296         else                                                                                       \
 297                 edma_write_tcdreg_c(chan, tcd_r, tcd_m->__name, __name);                           \
 298 } while (0)
 299
 300 #define edma_readl_chreg(chan, __name)                          \
 301         edma_readl(chan->edma,                                  \
 302                    (void __iomem *)&(container_of(((__force void *)chan->tcd),\
 303                                                   struct fsl_edma3_ch_reg, tcd)->__name))
 304
 305 #define edma_writel_chreg(chan, val,  __name)                   \
 306         edma_writel(chan->edma, val,                            \
 307                    (void __iomem *)&(container_of(((__force void *)chan->tcd),\
 308                                                   struct fsl_edma3_ch_reg, tcd)->__name))
 309
 310 #define fsl_edma_get_tcd(_chan, _tcd, _field)                   \
 311 (fsl_edma_drvflags(_chan) & FSL_EDMA_DRV_TCD64 ? (((struct fsl_edma_hw_tcd64 *)_tcd)->_field) : \
 312                                                  (((struct fsl_edma_hw_tcd *)_tcd)->_field))
 313
 314 #define fsl_edma_le_to_cpu(x)                                           \
 315 _Generic((x),                                                           \
 316         __le64 : le64_to_cpu((x)),                                      \
 317         __le32 : le32_to_cpu((x)),                                      \
 318         __le16 : le16_to_cpu((x))                                       \
 319 )
 320
 321 #define fsl_edma_get_tcd_to_cpu(_chan, _tcd, _field)                            \
 322 (fsl_edma_drvflags(_chan) & FSL_EDMA_DRV_TCD64 ?                                \
 323         fsl_edma_le_to_cpu(((struct fsl_edma_hw_tcd64 *)_tcd)->_field) :        \
 324         fsl_edma_le_to_cpu(((struct fsl_edma_hw_tcd *)_tcd)->_field))
 325
 326 #define fsl_edma_set_tcd_to_le_c(_tcd, _val, _field)                                    \
 327 _Generic(((_tcd)->_field),                                                              \
 328         __le64 : (_tcd)->_field = cpu_to_le64(_val),                                    \
 329         __le32 : (_tcd)->_field = cpu_to_le32(_val),                                    \
 330         __le16 : (_tcd)->_field = cpu_to_le16(_val)                                     \
 331 )
 332
 333 #define fsl_edma_set_tcd_to_le(_chan, _tcd, _val, _field)       \
 334 do {                                                            \
 335         if (fsl_edma_drvflags(_chan) & FSL_EDMA_DRV_TCD64)      \
 336                 fsl_edma_set_tcd_to_le_c((struct fsl_edma_hw_tcd64 *)_tcd, _val, _field);       \
 337         else                                                                                    \
 338                 fsl_edma_set_tcd_to_le_c((struct fsl_edma_hw_tcd *)_tcd, _val, _field);         \
 339 } while (0)
 340
 341 /* Need after struct defination */
 342 #include "fsl-edma-trace.h"
 343
 344 /*
 345  * R/W functions for big- or little-endian registers:
 346  * The eDMA controller's endian is independent of the CPU core's endian.
 347  * For the big-endian IP module, the offset for 8-bit or 16-bit registers
 348  * should also be swapped opposite to that in little-endian IP.
 349  */
 350 static inline u64 edma_readq(struct fsl_edma_engine *edma, void __iomem *addr)
 351 {
 352         u64 l, h;
 353
 354         if (edma->big_endian) {
 355                 l = ioread32be(addr);
 356                 h = ioread32be(addr + 4);
 357         } else {
 358                 l = ioread32(addr);
 359                 h = ioread32(addr + 4);
 360         }
 361
 362         trace_edma_readl(edma, addr, l);
 363         trace_edma_readl(edma, addr + 4, h);
 364
 365         return (h << 32) | l;
 366 }
 367
 368 static inline u32 edma_readl(struct fsl_edma_engine *edma, void __iomem *addr)
 369 {
 370         u32 val;
 371
 372         if (edma->big_endian)
 373                 val = ioread32be(addr);
 374         else
 375                 val = ioread32(addr);
 376
 377         trace_edma_readl(edma, addr, val);
 378
 379         return val;
 380 }
 381
 382 static inline u16 edma_readw(struct fsl_edma_engine *edma, void __iomem *addr)
 383 {
 384         u16 val;
 385
 386         if (edma->big_endian)
 387                 val = ioread16be(addr);
 388         else
 389                 val = ioread16(addr);
 390
 391         trace_edma_readw(edma, addr, val);
 392
 393         return val;
 394 }
 395
 396 static inline void edma_writeb(struct fsl_edma_engine *edma,
 397                                u8 val, void __iomem *addr)
 398 {
 399         /* swap the reg offset for these in big-endian mode */
 400         if (edma->big_endian)
 401                 iowrite8(val, (void __iomem *)((unsigned long)addr ^ 0x3));
 402         else
 403                 iowrite8(val, addr);
 404
 405         trace_edma_writeb(edma, addr, val);
 406 }
 407
 408 static inline void edma_writew(struct fsl_edma_engine *edma,
 409                                u16 val, void __iomem *addr)
 410 {
 411         /* swap the reg offset for these in big-endian mode */
 412         if (edma->big_endian)
 413                 iowrite16be(val, (void __iomem *)((unsigned long)addr ^ 0x2));
 414         else
 415                 iowrite16(val, addr);
 416
 417         trace_edma_writew(edma, addr, val);
 418 }
 419
 420 static inline void edma_writel(struct fsl_edma_engine *edma,
 421                                u32 val, void __iomem *addr)
 422 {
 423         if (edma->big_endian)
 424                 iowrite32be(val, addr);
 425         else
 426                 iowrite32(val, addr);
 427
 428         trace_edma_writel(edma, addr, val);
 429 }
 430
 431 static inline void edma_writeq(struct fsl_edma_engine *edma,
 432                                u64 val, void __iomem *addr)
 433 {
 434         if (edma->big_endian) {
 435                 iowrite32be(val & 0xFFFFFFFF, addr);
 436                 iowrite32be(val >> 32, addr + 4);
 437         } else {
 438                 iowrite32(val & 0xFFFFFFFF, addr);
 439                 iowrite32(val >> 32, addr + 4);
 440         }
 441
 442         trace_edma_writel(edma, addr, val & 0xFFFFFFFF);
 443         trace_edma_writel(edma, addr + 4, val >> 32);
 444 }
 445
 446 static inline struct fsl_edma_chan *to_fsl_edma_chan(struct dma_chan *chan)
 447 {
 448         return container_of(chan, struct fsl_edma_chan, vchan.chan);
 449 }
 450
 451 static inline struct fsl_edma_desc *to_fsl_edma_desc(struct virt_dma_desc *vd)
 452 {
 453         return container_of(vd, struct fsl_edma_desc, vdesc);
 454 }
 455
 456 static inline void fsl_edma_err_chan_handler(struct fsl_edma_chan *fsl_chan)
 457 {
 458         fsl_chan->status = DMA_ERROR;
 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_ */