kernel/drivers/dma/fsl-edma.c

   1 /*
   2  * drivers/dma/fsl-edma.c
   3  *
   4  * Copyright 2013-2014 Freescale Semiconductor, Inc.
   5  *
   6  * Driver for the Freescale eDMA engine with flexible channel multiplexing
   7  * capability for DMA request sources. The eDMA block can be found on some
   8  * Vybrid and Layerscape SoCs.
   9  *
  10  * This program is free software; you can redistribute  it and/or modify it
  11  * under  the terms of  the GNU General  Public License as published by the
  12  * Free Software Foundation;  either version 2 of the  License, or (at your
  13  * option) any later version.
  14  */
  15
  16 #include <linux/init.h>
  17 #include <linux/module.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/clk.h>
  20 #include <linux/dma-mapping.h>
  21 #include <linux/dmapool.h>
  22 #include <linux/slab.h>
  23 #include <linux/spinlock.h>
  24 #include <linux/of.h>
  25 #include <linux/of_device.h>
  26 #include <linux/of_address.h>
  27 #include <linux/of_irq.h>
  28 #include <linux/of_dma.h>
  29
  30 #include "virt-dma.h"
  31
  32 #define EDMA_CR                 0x00
  33 #define EDMA_ES                 0x04
  34 #define EDMA_ERQ                0x0C
  35 #define EDMA_EEI                0x14
  36 #define EDMA_SERQ               0x1B
  37 #define EDMA_CERQ               0x1A
  38 #define EDMA_SEEI               0x19
  39 #define EDMA_CEEI               0x18
  40 #define EDMA_CINT               0x1F
  41 #define EDMA_CERR               0x1E
  42 #define EDMA_SSRT               0x1D
  43 #define EDMA_CDNE               0x1C
  44 #define EDMA_INTR               0x24
  45 #define EDMA_ERR                0x2C
  46
  47 #define EDMA_TCD_SADDR(x)       (0x1000 + 32 * (x))
  48 #define EDMA_TCD_SOFF(x)        (0x1004 + 32 * (x))
  49 #define EDMA_TCD_ATTR(x)        (0x1006 + 32 * (x))
  50 #define EDMA_TCD_NBYTES(x)      (0x1008 + 32 * (x))
  51 #define EDMA_TCD_SLAST(x)       (0x100C + 32 * (x))
  52 #define EDMA_TCD_DADDR(x)       (0x1010 + 32 * (x))
  53 #define EDMA_TCD_DOFF(x)        (0x1014 + 32 * (x))
  54 #define EDMA_TCD_CITER_ELINK(x) (0x1016 + 32 * (x))
  55 #define EDMA_TCD_CITER(x)       (0x1016 + 32 * (x))
  56 #define EDMA_TCD_DLAST_SGA(x)   (0x1018 + 32 * (x))
  57 #define EDMA_TCD_CSR(x)         (0x101C + 32 * (x))
  58 #define EDMA_TCD_BITER_ELINK(x) (0x101E + 32 * (x))
  59 #define EDMA_TCD_BITER(x)       (0x101E + 32 * (x))
  60
  61 #define EDMA_CR_EDBG            BIT(1)
  62 #define EDMA_CR_ERCA            BIT(2)
  63 #define EDMA_CR_ERGA            BIT(3)
  64 #define EDMA_CR_HOE             BIT(4)
  65 #define EDMA_CR_HALT            BIT(5)
  66 #define EDMA_CR_CLM             BIT(6)
  67 #define EDMA_CR_EMLM            BIT(7)
  68 #define EDMA_CR_ECX             BIT(16)
  69 #define EDMA_CR_CX              BIT(17)
  70
  71 #define EDMA_SEEI_SEEI(x)       ((x) & 0x1F)
  72 #define EDMA_CEEI_CEEI(x)       ((x) & 0x1F)
  73 #define EDMA_CINT_CINT(x)       ((x) & 0x1F)
  74 #define EDMA_CERR_CERR(x)       ((x) & 0x1F)
  75
  76 #define EDMA_TCD_ATTR_DSIZE(x)          (((x) & 0x0007))
  77 #define EDMA_TCD_ATTR_DMOD(x)           (((x) & 0x001F) << 3)
  78 #define EDMA_TCD_ATTR_SSIZE(x)          (((x) & 0x0007) << 8)
  79 #define EDMA_TCD_ATTR_SMOD(x)           (((x) & 0x001F) << 11)
  80 #define EDMA_TCD_ATTR_SSIZE_8BIT        (0x0000)
  81 #define EDMA_TCD_ATTR_SSIZE_16BIT       (0x0100)
  82 #define EDMA_TCD_ATTR_SSIZE_32BIT       (0x0200)
  83 #define EDMA_TCD_ATTR_SSIZE_64BIT       (0x0300)
  84 #define EDMA_TCD_ATTR_SSIZE_32BYTE      (0x0500)
  85 #define EDMA_TCD_ATTR_DSIZE_8BIT        (0x0000)
  86 #define EDMA_TCD_ATTR_DSIZE_16BIT       (0x0001)
  87 #define EDMA_TCD_ATTR_DSIZE_32BIT       (0x0002)
  88 #define EDMA_TCD_ATTR_DSIZE_64BIT       (0x0003)
  89 #define EDMA_TCD_ATTR_DSIZE_32BYTE      (0x0005)
  90
  91 #define EDMA_TCD_SOFF_SOFF(x)           (x)
  92 #define EDMA_TCD_NBYTES_NBYTES(x)       (x)
  93 #define EDMA_TCD_SLAST_SLAST(x)         (x)
  94 #define EDMA_TCD_DADDR_DADDR(x)         (x)
  95 #define EDMA_TCD_CITER_CITER(x)         ((x) & 0x7FFF)
  96 #define EDMA_TCD_DOFF_DOFF(x)           (x)
  97 #define EDMA_TCD_DLAST_SGA_DLAST_SGA(x) (x)
  98 #define EDMA_TCD_BITER_BITER(x)         ((x) & 0x7FFF)
  99
 100 #define EDMA_TCD_CSR_START              BIT(0)
 101 #define EDMA_TCD_CSR_INT_MAJOR          BIT(1)
 102 #define EDMA_TCD_CSR_INT_HALF           BIT(2)
 103 #define EDMA_TCD_CSR_D_REQ              BIT(3)
 104 #define EDMA_TCD_CSR_E_SG               BIT(4)
 105 #define EDMA_TCD_CSR_E_LINK             BIT(5)
 106 #define EDMA_TCD_CSR_ACTIVE             BIT(6)
 107 #define EDMA_TCD_CSR_DONE               BIT(7)
 108
 109 #define EDMAMUX_CHCFG_DIS               0x0
 110 #define EDMAMUX_CHCFG_ENBL              0x80
 111 #define EDMAMUX_CHCFG_SOURCE(n)         ((n) & 0x3F)
 112
 113 #define DMAMUX_NR       2
 114
 115 #define FSL_EDMA_BUSWIDTHS      BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \
 116                                 BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \
 117                                 BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) | \
 118                                 BIT(DMA_SLAVE_BUSWIDTH_8_BYTES)
 119
 120 struct fsl_edma_hw_tcd {
 121         __le32  saddr;
 122         __le16  soff;
 123         __le16  attr;
 124         __le32  nbytes;
 125         __le32  slast;
 126         __le32  daddr;
 127         __le16  doff;
 128         __le16  citer;
 129         __le32  dlast_sga;
 130         __le16  csr;
 131         __le16  biter;
 132 };
 133
 134 struct fsl_edma_sw_tcd {
 135         dma_addr_t                      ptcd;
 136         struct fsl_edma_hw_tcd          *vtcd;
 137 };
 138
 139 struct fsl_edma_slave_config {
 140         enum dma_transfer_direction     dir;
 141         enum dma_slave_buswidth         addr_width;
 142         u32                             dev_addr;
 143         u32                             burst;
 144         u32                             attr;
 145 };
 146
 147 struct fsl_edma_chan {
 148         struct virt_dma_chan            vchan;
 149         enum dma_status                 status;
 150         struct fsl_edma_engine          *edma;
 151         struct fsl_edma_desc            *edesc;
 152         struct fsl_edma_slave_config    fsc;
 153         struct dma_pool                 *tcd_pool;
 154 };
 155
 156 struct fsl_edma_desc {
 157         struct virt_dma_desc            vdesc;
 158         struct fsl_edma_chan            *echan;
 159         bool                            iscyclic;
 160         unsigned int                    n_tcds;
 161         struct fsl_edma_sw_tcd          tcd[];
 162 };
 163
 164 struct fsl_edma_engine {
 165         struct dma_device       dma_dev;
 166         void __iomem            *membase;
 167         void __iomem            *muxbase[DMAMUX_NR];
 168         struct clk              *muxclk[DMAMUX_NR];
 169         struct mutex            fsl_edma_mutex;
 170         u32                     n_chans;
 171         int                     txirq;
 172         int                     errirq;
 173         bool                    big_endian;
 174         struct fsl_edma_chan    chans[];
 175 };
 176
 177 /*
 178  * R/W functions for big- or little-endian registers:
 179  * The eDMA controller's endian is independent of the CPU core's endian.
 180  * For the big-endian IP module, the offset for 8-bit or 16-bit registers
 181  * should also be swapped opposite to that in little-endian IP.
 182  */
 183
 184 static u32 edma_readl(struct fsl_edma_engine *edma, void __iomem *addr)
 185 {
 186         if (edma->big_endian)
 187                 return ioread32be(addr);
 188         else
 189                 return ioread32(addr);
 190 }
 191
 192 static void edma_writeb(struct fsl_edma_engine *edma, u8 val, void __iomem *addr)
 193 {
 194         /* swap the reg offset for these in big-endian mode */
 195         if (edma->big_endian)
 196                 iowrite8(val, (void __iomem *)((unsigned long)addr ^ 0x3));
 197         else
 198                 iowrite8(val, addr);
 199 }
 200
 201 static void edma_writew(struct fsl_edma_engine *edma, u16 val, void __iomem *addr)
 202 {
 203         /* swap the reg offset for these in big-endian mode */
 204         if (edma->big_endian)
 205                 iowrite16be(val, (void __iomem *)((unsigned long)addr ^ 0x2));
 206         else
 207                 iowrite16(val, addr);
 208 }
 209
 210 static void edma_writel(struct fsl_edma_engine *edma, u32 val, void __iomem *addr)
 211 {
 212         if (edma->big_endian)
 213                 iowrite32be(val, addr);
 214         else
 215                 iowrite32(val, addr);
 216 }
 217
 218 static struct fsl_edma_chan *to_fsl_edma_chan(struct dma_chan *chan)
 219 {
 220         return container_of(chan, struct fsl_edma_chan, vchan.chan);
 221 }
 222
 223 static struct fsl_edma_desc *to_fsl_edma_desc(struct virt_dma_desc *vd)
 224 {
 225         return container_of(vd, struct fsl_edma_desc, vdesc);
 226 }
 227
 228 static void fsl_edma_enable_request(struct fsl_edma_chan *fsl_chan)
 229 {
 230         void __iomem *addr = fsl_chan->edma->membase;
 231         u32 ch = fsl_chan->vchan.chan.chan_id;
 232
 233         edma_writeb(fsl_chan->edma, EDMA_SEEI_SEEI(ch), addr + EDMA_SEEI);
 234         edma_writeb(fsl_chan->edma, ch, addr + EDMA_SERQ);
 235 }
 236
 237 static void fsl_edma_disable_request(struct fsl_edma_chan *fsl_chan)
 238 {
 239         void __iomem *addr = fsl_chan->edma->membase;
 240         u32 ch = fsl_chan->vchan.chan.chan_id;
 241
 242         edma_writeb(fsl_chan->edma, ch, addr + EDMA_CERQ);
 243         edma_writeb(fsl_chan->edma, EDMA_CEEI_CEEI(ch), addr + EDMA_CEEI);
 244 }
 245
 246 static void fsl_edma_chan_mux(struct fsl_edma_chan *fsl_chan,
 247                         unsigned int slot, bool enable)
 248 {
 249         u32 ch = fsl_chan->vchan.chan.chan_id;
 250         void __iomem *muxaddr;
 251         unsigned chans_per_mux, ch_off;
 252
 253         chans_per_mux = fsl_chan->edma->n_chans / DMAMUX_NR;
 254         ch_off = fsl_chan->vchan.chan.chan_id % chans_per_mux;
 255         muxaddr = fsl_chan->edma->muxbase[ch / chans_per_mux];
 256         slot = EDMAMUX_CHCFG_SOURCE(slot);
 257
 258         if (enable)
 259                 iowrite8(EDMAMUX_CHCFG_ENBL | slot, muxaddr + ch_off);
 260         else
 261                 iowrite8(EDMAMUX_CHCFG_DIS, muxaddr + ch_off);
 262 }
 263
 264 static unsigned int fsl_edma_get_tcd_attr(enum dma_slave_buswidth addr_width)
 265 {
 266         switch (addr_width) {
 267         case 1:
 268                 return EDMA_TCD_ATTR_SSIZE_8BIT | EDMA_TCD_ATTR_DSIZE_8BIT;
 269         case 2:
 270                 return EDMA_TCD_ATTR_SSIZE_16BIT | EDMA_TCD_ATTR_DSIZE_16BIT;
 271         case 4:
 272                 return EDMA_TCD_ATTR_SSIZE_32BIT | EDMA_TCD_ATTR_DSIZE_32BIT;
 273         case 8:
 274                 return EDMA_TCD_ATTR_SSIZE_64BIT | EDMA_TCD_ATTR_DSIZE_64BIT;
 275         default:
 276                 return EDMA_TCD_ATTR_SSIZE_32BIT | EDMA_TCD_ATTR_DSIZE_32BIT;
 277         }
 278 }
 279
 280 static void fsl_edma_free_desc(struct virt_dma_desc *vdesc)
 281 {
 282         struct fsl_edma_desc *fsl_desc;
 283         int i;
 284
 285         fsl_desc = to_fsl_edma_desc(vdesc);
 286         for (i = 0; i < fsl_desc->n_tcds; i++)
 287                 dma_pool_free(fsl_desc->echan->tcd_pool, fsl_desc->tcd[i].vtcd,
 288                               fsl_desc->tcd[i].ptcd);
 289         kfree(fsl_desc);
 290 }
 291
 292 static int fsl_edma_terminate_all(struct dma_chan *chan)
 293 {
 294         struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
 295         unsigned long flags;
 296         LIST_HEAD(head);
 297
 298         spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
 299         fsl_edma_disable_request(fsl_chan);
 300         fsl_chan->edesc = NULL;
 301         vchan_get_all_descriptors(&fsl_chan->vchan, &head);
 302         spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
 303         vchan_dma_desc_free_list(&fsl_chan->vchan, &head);
 304         return 0;
 305 }
 306
 307 static int fsl_edma_pause(struct dma_chan *chan)
 308 {
 309         struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
 310         unsigned long flags;
 311
 312         spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
 313         if (fsl_chan->edesc) {
 314                 fsl_edma_disable_request(fsl_chan);
 315                 fsl_chan->status = DMA_PAUSED;
 316         }
 317         spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
 318         return 0;
 319 }
 320
 321 static int fsl_edma_resume(struct dma_chan *chan)
 322 {
 323         struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
 324         unsigned long flags;
 325
 326         spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
 327         if (fsl_chan->edesc) {
 328                 fsl_edma_enable_request(fsl_chan);
 329                 fsl_chan->status = DMA_IN_PROGRESS;
 330         }
 331         spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
 332         return 0;
 333 }
 334
 335 static int fsl_edma_slave_config(struct dma_chan *chan,
 336                                  struct dma_slave_config *cfg)
 337 {
 338         struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
 339
 340         fsl_chan->fsc.dir = cfg->direction;
 341         if (cfg->direction == DMA_DEV_TO_MEM) {
 342                 fsl_chan->fsc.dev_addr = cfg->src_addr;
 343                 fsl_chan->fsc.addr_width = cfg->src_addr_width;
 344                 fsl_chan->fsc.burst = cfg->src_maxburst;
 345                 fsl_chan->fsc.attr = fsl_edma_get_tcd_attr(cfg->src_addr_width);
 346         } else if (cfg->direction == DMA_MEM_TO_DEV) {
 347                 fsl_chan->fsc.dev_addr = cfg->dst_addr;
 348                 fsl_chan->fsc.addr_width = cfg->dst_addr_width;
 349                 fsl_chan->fsc.burst = cfg->dst_maxburst;
 350                 fsl_chan->fsc.attr = fsl_edma_get_tcd_attr(cfg->dst_addr_width);
 351         } else {
 352                         return -EINVAL;
 353         }
 354         return 0;
 355 }
 356
 357 static size_t fsl_edma_desc_residue(struct fsl_edma_chan *fsl_chan,
 358                 struct virt_dma_desc *vdesc, bool in_progress)
 359 {
 360         struct fsl_edma_desc *edesc = fsl_chan->edesc;
 361         void __iomem *addr = fsl_chan->edma->membase;
 362         u32 ch = fsl_chan->vchan.chan.chan_id;
 363         enum dma_transfer_direction dir = fsl_chan->fsc.dir;
 364         dma_addr_t cur_addr, dma_addr;
 365         size_t len, size;
 366         int i;
 367
 368         /* calculate the total size in this desc */
 369         for (len = i = 0; i < fsl_chan->edesc->n_tcds; i++)
 370                 len += le32_to_cpu(edesc->tcd[i].vtcd->nbytes)
 371                         * le16_to_cpu(edesc->tcd[i].vtcd->biter);
 372
 373         if (!in_progress)
 374                 return len;
 375
 376         if (dir == DMA_MEM_TO_DEV)
 377                 cur_addr = edma_readl(fsl_chan->edma, addr + EDMA_TCD_SADDR(ch));
 378         else
 379                 cur_addr = edma_readl(fsl_chan->edma, addr + EDMA_TCD_DADDR(ch));
 380
 381         /* figure out the finished and calculate the residue */
 382         for (i = 0; i < fsl_chan->edesc->n_tcds; i++) {
 383                 size = le32_to_cpu(edesc->tcd[i].vtcd->nbytes)
 384                         * le16_to_cpu(edesc->tcd[i].vtcd->biter);
 385                 if (dir == DMA_MEM_TO_DEV)
 386                         dma_addr = le32_to_cpu(edesc->tcd[i].vtcd->saddr);
 387                 else
 388                         dma_addr = le32_to_cpu(edesc->tcd[i].vtcd->daddr);
 389
 390                 len -= size;
 391                 if (cur_addr >= dma_addr && cur_addr < dma_addr + size) {
 392                         len += dma_addr + size - cur_addr;
 393                         break;
 394                 }
 395         }
 396
 397         return len;
 398 }
 399
 400 static enum dma_status fsl_edma_tx_status(struct dma_chan *chan,
 401                 dma_cookie_t cookie, struct dma_tx_state *txstate)
 402 {
 403         struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
 404         struct virt_dma_desc *vdesc;
 405         enum dma_status status;
 406         unsigned long flags;
 407
 408         status = dma_cookie_status(chan, cookie, txstate);
 409         if (status == DMA_COMPLETE)
 410                 return status;
 411
 412         if (!txstate)
 413                 return fsl_chan->status;
 414
 415         spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
 416         vdesc = vchan_find_desc(&fsl_chan->vchan, cookie);
 417         if (fsl_chan->edesc && cookie == fsl_chan->edesc->vdesc.tx.cookie)
 418                 txstate->residue = fsl_edma_desc_residue(fsl_chan, vdesc, true);
 419         else if (vdesc)
 420                 txstate->residue = fsl_edma_desc_residue(fsl_chan, vdesc, false);
 421         else
 422                 txstate->residue = 0;
 423
 424         spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
 425
 426         return fsl_chan->status;
 427 }
 428
 429 static void fsl_edma_set_tcd_regs(struct fsl_edma_chan *fsl_chan,
 430                                   struct fsl_edma_hw_tcd *tcd)
 431 {
 432         struct fsl_edma_engine *edma = fsl_chan->edma;
 433         void __iomem *addr = fsl_chan->edma->membase;
 434         u32 ch = fsl_chan->vchan.chan.chan_id;
 435
 436         /*
 437          * TCD parameters are stored in struct fsl_edma_hw_tcd in little
 438          * endian format. However, we need to load the TCD registers in
 439          * big- or little-endian obeying the eDMA engine model endian.
 440          */
 441         edma_writew(edma, 0, addr + EDMA_TCD_CSR(ch));
 442         edma_writel(edma, le32_to_cpu(tcd->saddr), addr + EDMA_TCD_SADDR(ch));
 443         edma_writel(edma, le32_to_cpu(tcd->daddr), addr + EDMA_TCD_DADDR(ch));
 444
 445         edma_writew(edma, le16_to_cpu(tcd->attr), addr + EDMA_TCD_ATTR(ch));
 446         edma_writew(edma, le16_to_cpu(tcd->soff), addr + EDMA_TCD_SOFF(ch));
 447
 448         edma_writel(edma, le32_to_cpu(tcd->nbytes), addr + EDMA_TCD_NBYTES(ch));
 449         edma_writel(edma, le32_to_cpu(tcd->slast), addr + EDMA_TCD_SLAST(ch));
 450
 451         edma_writew(edma, le16_to_cpu(tcd->citer), addr + EDMA_TCD_CITER(ch));
 452         edma_writew(edma, le16_to_cpu(tcd->biter), addr + EDMA_TCD_BITER(ch));
 453         edma_writew(edma, le16_to_cpu(tcd->doff), addr + EDMA_TCD_DOFF(ch));
 454
 455         edma_writel(edma, le32_to_cpu(tcd->dlast_sga), addr + EDMA_TCD_DLAST_SGA(ch));
 456
 457         edma_writew(edma, le16_to_cpu(tcd->csr), addr + EDMA_TCD_CSR(ch));
 458 }
 459
 460 static inline
 461 void fsl_edma_fill_tcd(struct fsl_edma_hw_tcd *tcd, u32 src, u32 dst,
 462                        u16 attr, u16 soff, u32 nbytes, u32 slast, u16 citer,
 463                        u16 biter, u16 doff, u32 dlast_sga, bool major_int,
 464                        bool disable_req, bool enable_sg)
 465 {
 466         u16 csr = 0;
 467
 468         /*
 469          * eDMA hardware SGs require the TCDs to be stored in little
 470          * endian format irrespective of the register endian model.
 471          * So we put the value in little endian in memory, waiting
 472          * for fsl_edma_set_tcd_regs doing the swap.
 473          */
 474         tcd->saddr = cpu_to_le32(src);
 475         tcd->daddr = cpu_to_le32(dst);
 476
 477         tcd->attr = cpu_to_le16(attr);
 478
 479         tcd->soff = cpu_to_le16(EDMA_TCD_SOFF_SOFF(soff));
 480
 481         tcd->nbytes = cpu_to_le32(EDMA_TCD_NBYTES_NBYTES(nbytes));
 482         tcd->slast = cpu_to_le32(EDMA_TCD_SLAST_SLAST(slast));
 483
 484         tcd->citer = cpu_to_le16(EDMA_TCD_CITER_CITER(citer));
 485         tcd->doff = cpu_to_le16(EDMA_TCD_DOFF_DOFF(doff));
 486
 487         tcd->dlast_sga = cpu_to_le32(EDMA_TCD_DLAST_SGA_DLAST_SGA(dlast_sga));
 488
 489         tcd->biter = cpu_to_le16(EDMA_TCD_BITER_BITER(biter));
 490         if (major_int)
 491                 csr |= EDMA_TCD_CSR_INT_MAJOR;
 492
 493         if (disable_req)
 494                 csr |= EDMA_TCD_CSR_D_REQ;
 495
 496         if (enable_sg)
 497                 csr |= EDMA_TCD_CSR_E_SG;
 498
 499         tcd->csr = cpu_to_le16(csr);
 500 }
 501
 502 static struct fsl_edma_desc *fsl_edma_alloc_desc(struct fsl_edma_chan *fsl_chan,
 503                 int sg_len)
 504 {
 505         struct fsl_edma_desc *fsl_desc;
 506         int i;
 507
 508         fsl_desc = kzalloc(sizeof(*fsl_desc) + sizeof(struct fsl_edma_sw_tcd) * sg_len,
 509                                 GFP_NOWAIT);
 510         if (!fsl_desc)
 511                 return NULL;
 512
 513         fsl_desc->echan = fsl_chan;
 514         fsl_desc->n_tcds = sg_len;
 515         for (i = 0; i < sg_len; i++) {
 516                 fsl_desc->tcd[i].vtcd = dma_pool_alloc(fsl_chan->tcd_pool,
 517                                         GFP_NOWAIT, &fsl_desc->tcd[i].ptcd);
 518                 if (!fsl_desc->tcd[i].vtcd)
 519                         goto err;
 520         }
 521         return fsl_desc;
 522
 523 err:
 524         while (--i >= 0)
 525                 dma_pool_free(fsl_chan->tcd_pool, fsl_desc->tcd[i].vtcd,
 526                                 fsl_desc->tcd[i].ptcd);
 527         kfree(fsl_desc);
 528         return NULL;
 529 }
 530
 531 static struct dma_async_tx_descriptor *fsl_edma_prep_dma_cyclic(
 532                 struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len,
 533                 size_t period_len, enum dma_transfer_direction direction,
 534                 unsigned long flags)
 535 {
 536         struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
 537         struct fsl_edma_desc *fsl_desc;
 538         dma_addr_t dma_buf_next;
 539         int sg_len, i;
 540         u32 src_addr, dst_addr, last_sg, nbytes;
 541         u16 soff, doff, iter;
 542
 543         if (!is_slave_direction(fsl_chan->fsc.dir))
 544                 return NULL;
 545
 546         sg_len = buf_len / period_len;
 547         fsl_desc = fsl_edma_alloc_desc(fsl_chan, sg_len);
 548         if (!fsl_desc)
 549                 return NULL;
 550         fsl_desc->iscyclic = true;
 551
 552         dma_buf_next = dma_addr;
 553         nbytes = fsl_chan->fsc.addr_width * fsl_chan->fsc.burst;
 554         iter = period_len / nbytes;
 555
 556         for (i = 0; i < sg_len; i++) {
 557                 if (dma_buf_next >= dma_addr + buf_len)
 558                         dma_buf_next = dma_addr;
 559
 560                 /* get next sg's physical address */
 561                 last_sg = fsl_desc->tcd[(i + 1) % sg_len].ptcd;
 562
 563                 if (fsl_chan->fsc.dir == DMA_MEM_TO_DEV) {
 564                         src_addr = dma_buf_next;
 565                         dst_addr = fsl_chan->fsc.dev_addr;
 566                         soff = fsl_chan->fsc.addr_width;
 567                         doff = 0;
 568                 } else {
 569                         src_addr = fsl_chan->fsc.dev_addr;
 570                         dst_addr = dma_buf_next;
 571                         soff = 0;
 572                         doff = fsl_chan->fsc.addr_width;
 573                 }
 574
 575                 fsl_edma_fill_tcd(fsl_desc->tcd[i].vtcd, src_addr, dst_addr,
 576                                   fsl_chan->fsc.attr, soff, nbytes, 0, iter,
 577                                   iter, doff, last_sg, true, false, true);
 578                 dma_buf_next += period_len;
 579         }
 580
 581         return vchan_tx_prep(&fsl_chan->vchan, &fsl_desc->vdesc, flags);
 582 }
 583
 584 static struct dma_async_tx_descriptor *fsl_edma_prep_slave_sg(
 585                 struct dma_chan *chan, struct scatterlist *sgl,
 586                 unsigned int sg_len, enum dma_transfer_direction direction,
 587                 unsigned long flags, void *context)
 588 {
 589         struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
 590         struct fsl_edma_desc *fsl_desc;
 591         struct scatterlist *sg;
 592         u32 src_addr, dst_addr, last_sg, nbytes;
 593         u16 soff, doff, iter;
 594         int i;
 595
 596         if (!is_slave_direction(fsl_chan->fsc.dir))
 597                 return NULL;
 598
 599         fsl_desc = fsl_edma_alloc_desc(fsl_chan, sg_len);
 600         if (!fsl_desc)
 601                 return NULL;
 602         fsl_desc->iscyclic = false;
 603
 604         nbytes = fsl_chan->fsc.addr_width * fsl_chan->fsc.burst;
 605         for_each_sg(sgl, sg, sg_len, i) {
 606                 /* get next sg's physical address */
 607                 last_sg = fsl_desc->tcd[(i + 1) % sg_len].ptcd;
 608
 609                 if (fsl_chan->fsc.dir == DMA_MEM_TO_DEV) {
 610                         src_addr = sg_dma_address(sg);
 611                         dst_addr = fsl_chan->fsc.dev_addr;
 612                         soff = fsl_chan->fsc.addr_width;
 613                         doff = 0;
 614                 } else {
 615                         src_addr = fsl_chan->fsc.dev_addr;
 616                         dst_addr = sg_dma_address(sg);
 617                         soff = 0;
 618                         doff = fsl_chan->fsc.addr_width;
 619                 }
 620
 621                 iter = sg_dma_len(sg) / nbytes;
 622                 if (i < sg_len - 1) {
 623                         last_sg = fsl_desc->tcd[(i + 1)].ptcd;
 624                         fsl_edma_fill_tcd(fsl_desc->tcd[i].vtcd, src_addr,
 625                                           dst_addr, fsl_chan->fsc.attr, soff,
 626                                           nbytes, 0, iter, iter, doff, last_sg,
 627                                           false, false, true);
 628                 } else {
 629                         last_sg = 0;
 630                         fsl_edma_fill_tcd(fsl_desc->tcd[i].vtcd, src_addr,
 631                                           dst_addr, fsl_chan->fsc.attr, soff,
 632                                           nbytes, 0, iter, iter, doff, last_sg,
 633                                           true, true, false);
 634                 }
 635         }
 636
 637         return vchan_tx_prep(&fsl_chan->vchan, &fsl_desc->vdesc, flags);
 638 }
 639
 640 static void fsl_edma_xfer_desc(struct fsl_edma_chan *fsl_chan)
 641 {
 642         struct virt_dma_desc *vdesc;
 643
 644         vdesc = vchan_next_desc(&fsl_chan->vchan);
 645         if (!vdesc)
 646                 return;
 647         fsl_chan->edesc = to_fsl_edma_desc(vdesc);
 648         fsl_edma_set_tcd_regs(fsl_chan, fsl_chan->edesc->tcd[0].vtcd);
 649         fsl_edma_enable_request(fsl_chan);
 650         fsl_chan->status = DMA_IN_PROGRESS;
 651 }
 652
 653 static irqreturn_t fsl_edma_tx_handler(int irq, void *dev_id)
 654 {
 655         struct fsl_edma_engine *fsl_edma = dev_id;
 656         unsigned int intr, ch;
 657         void __iomem *base_addr;
 658         struct fsl_edma_chan *fsl_chan;
 659
 660         base_addr = fsl_edma->membase;
 661
 662         intr = edma_readl(fsl_edma, base_addr + EDMA_INTR);
 663         if (!intr)
 664                 return IRQ_NONE;
 665
 666         for (ch = 0; ch < fsl_edma->n_chans; ch++) {
 667                 if (intr & (0x1 << ch)) {
 668                         edma_writeb(fsl_edma, EDMA_CINT_CINT(ch),
 669                                 base_addr + EDMA_CINT);
 670
 671                         fsl_chan = &fsl_edma->chans[ch];
 672
 673                         spin_lock(&fsl_chan->vchan.lock);
 674                         if (!fsl_chan->edesc->iscyclic) {
 675                                 list_del(&fsl_chan->edesc->vdesc.node);
 676                                 vchan_cookie_complete(&fsl_chan->edesc->vdesc);
 677                                 fsl_chan->edesc = NULL;
 678                                 fsl_chan->status = DMA_COMPLETE;
 679                         } else {
 680                                 vchan_cyclic_callback(&fsl_chan->edesc->vdesc);
 681                         }
 682
 683                         if (!fsl_chan->edesc)
 684                                 fsl_edma_xfer_desc(fsl_chan);
 685
 686                         spin_unlock(&fsl_chan->vchan.lock);
 687                 }
 688         }
 689         return IRQ_HANDLED;
 690 }
 691
 692 static irqreturn_t fsl_edma_err_handler(int irq, void *dev_id)
 693 {
 694         struct fsl_edma_engine *fsl_edma = dev_id;
 695         unsigned int err, ch;
 696
 697         err = edma_readl(fsl_edma, fsl_edma->membase + EDMA_ERR);
 698         if (!err)
 699                 return IRQ_NONE;
 700
 701         for (ch = 0; ch < fsl_edma->n_chans; ch++) {
 702                 if (err & (0x1 << ch)) {
 703                         fsl_edma_disable_request(&fsl_edma->chans[ch]);
 704                         edma_writeb(fsl_edma, EDMA_CERR_CERR(ch),
 705                                 fsl_edma->membase + EDMA_CERR);
 706                         fsl_edma->chans[ch].status = DMA_ERROR;
 707                 }
 708         }
 709         return IRQ_HANDLED;
 710 }
 711
 712 static irqreturn_t fsl_edma_irq_handler(int irq, void *dev_id)
 713 {
 714         if (fsl_edma_tx_handler(irq, dev_id) == IRQ_HANDLED)
 715                 return IRQ_HANDLED;
 716
 717         return fsl_edma_err_handler(irq, dev_id);
 718 }
 719
 720 static void fsl_edma_issue_pending(struct dma_chan *chan)
 721 {
 722         struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
 723         unsigned long flags;
 724
 725         spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
 726
 727         if (vchan_issue_pending(&fsl_chan->vchan) && !fsl_chan->edesc)
 728                 fsl_edma_xfer_desc(fsl_chan);
 729
 730         spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
 731 }
 732
 733 static struct dma_chan *fsl_edma_xlate(struct of_phandle_args *dma_spec,
 734                 struct of_dma *ofdma)
 735 {
 736         struct fsl_edma_engine *fsl_edma = ofdma->of_dma_data;
 737         struct dma_chan *chan, *_chan;
 738         unsigned long chans_per_mux = fsl_edma->n_chans / DMAMUX_NR;
 739
 740         if (dma_spec->args_count != 2)
 741                 return NULL;
 742
 743         mutex_lock(&fsl_edma->fsl_edma_mutex);
 744         list_for_each_entry_safe(chan, _chan, &fsl_edma->dma_dev.channels, device_node) {
 745                 if (chan->client_count)
 746                         continue;
 747                 if ((chan->chan_id / chans_per_mux) == dma_spec->args[0]) {
 748                         chan = dma_get_slave_channel(chan);
 749                         if (chan) {
 750                                 chan->device->privatecnt++;
 751                                 fsl_edma_chan_mux(to_fsl_edma_chan(chan),
 752                                         dma_spec->args[1], true);
 753                                 mutex_unlock(&fsl_edma->fsl_edma_mutex);
 754                                 return chan;
 755                         }
 756                 }
 757         }
 758         mutex_unlock(&fsl_edma->fsl_edma_mutex);
 759         return NULL;
 760 }
 761
 762 static int fsl_edma_alloc_chan_resources(struct dma_chan *chan)
 763 {
 764         struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
 765
 766         fsl_chan->tcd_pool = dma_pool_create("tcd_pool", chan->device->dev,
 767                                 sizeof(struct fsl_edma_hw_tcd),
 768                                 32, 0);
 769         return 0;
 770 }
 771
 772 static void fsl_edma_free_chan_resources(struct dma_chan *chan)
 773 {
 774         struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
 775         unsigned long flags;
 776         LIST_HEAD(head);
 777
 778         spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
 779         fsl_edma_disable_request(fsl_chan);
 780         fsl_edma_chan_mux(fsl_chan, 0, false);
 781         fsl_chan->edesc = NULL;
 782         vchan_get_all_descriptors(&fsl_chan->vchan, &head);
 783         spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
 784
 785         vchan_dma_desc_free_list(&fsl_chan->vchan, &head);
 786         dma_pool_destroy(fsl_chan->tcd_pool);
 787         fsl_chan->tcd_pool = NULL;
 788 }
 789
 790 static int
 791 fsl_edma_irq_init(struct platform_device *pdev, struct fsl_edma_engine *fsl_edma)
 792 {
 793         int ret;
 794
 795         fsl_edma->txirq = platform_get_irq_byname(pdev, "edma-tx");
 796         if (fsl_edma->txirq < 0) {
 797                 dev_err(&pdev->dev, "Can't get edma-tx irq.\n");
 798                 return fsl_edma->txirq;
 799         }
 800
 801         fsl_edma->errirq = platform_get_irq_byname(pdev, "edma-err");
 802         if (fsl_edma->errirq < 0) {
 803                 dev_err(&pdev->dev, "Can't get edma-err irq.\n");
 804                 return fsl_edma->errirq;
 805         }
 806
 807         if (fsl_edma->txirq == fsl_edma->errirq) {
 808                 ret = devm_request_irq(&pdev->dev, fsl_edma->txirq,
 809                                 fsl_edma_irq_handler, 0, "eDMA", fsl_edma);
 810                 if (ret) {
 811                         dev_err(&pdev->dev, "Can't register eDMA IRQ.\n");
 812                          return  ret;
 813                 }
 814         } else {
 815                 ret = devm_request_irq(&pdev->dev, fsl_edma->txirq,
 816                                 fsl_edma_tx_handler, 0, "eDMA tx", fsl_edma);
 817                 if (ret) {
 818                         dev_err(&pdev->dev, "Can't register eDMA tx IRQ.\n");
 819                         return  ret;
 820                 }
 821
 822                 ret = devm_request_irq(&pdev->dev, fsl_edma->errirq,
 823                                 fsl_edma_err_handler, 0, "eDMA err", fsl_edma);
 824                 if (ret) {
 825                         dev_err(&pdev->dev, "Can't register eDMA err IRQ.\n");
 826                         return  ret;
 827                 }
 828         }
 829
 830         return 0;
 831 }
 832
 833 static int fsl_edma_probe(struct platform_device *pdev)
 834 {
 835         struct device_node *np = pdev->dev.of_node;
 836         struct fsl_edma_engine *fsl_edma;
 837         struct fsl_edma_chan *fsl_chan;
 838         struct resource *res;
 839         int len, chans;
 840         int ret, i;
 841
 842         ret = of_property_read_u32(np, "dma-channels", &chans);
 843         if (ret) {
 844                 dev_err(&pdev->dev, "Can't get dma-channels.\n");
 845                 return ret;
 846         }
 847
 848         len = sizeof(*fsl_edma) + sizeof(*fsl_chan) * chans;
 849         fsl_edma = devm_kzalloc(&pdev->dev, len, GFP_KERNEL);
 850         if (!fsl_edma)
 851                 return -ENOMEM;
 852
 853         fsl_edma->n_chans = chans;
 854         mutex_init(&fsl_edma->fsl_edma_mutex);
 855
 856         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 857         fsl_edma->membase = devm_ioremap_resource(&pdev->dev, res);
 858         if (IS_ERR(fsl_edma->membase))
 859                 return PTR_ERR(fsl_edma->membase);
 860
 861         for (i = 0; i < DMAMUX_NR; i++) {
 862                 char clkname[32];
 863
 864                 res = platform_get_resource(pdev, IORESOURCE_MEM, 1 + i);
 865                 fsl_edma->muxbase[i] = devm_ioremap_resource(&pdev->dev, res);
 866                 if (IS_ERR(fsl_edma->muxbase[i]))
 867                         return PTR_ERR(fsl_edma->muxbase[i]);
 868
 869                 sprintf(clkname, "dmamux%d", i);
 870                 fsl_edma->muxclk[i] = devm_clk_get(&pdev->dev, clkname);
 871                 if (IS_ERR(fsl_edma->muxclk[i])) {
 872                         dev_err(&pdev->dev, "Missing DMAMUX block clock.\n");
 873                         return PTR_ERR(fsl_edma->muxclk[i]);
 874                 }
 875
 876                 ret = clk_prepare_enable(fsl_edma->muxclk[i]);
 877                 if (ret) {
 878                         dev_err(&pdev->dev, "DMAMUX clk block failed.\n");
 879                         return ret;
 880                 }
 881
 882         }
 883
 884         ret = fsl_edma_irq_init(pdev, fsl_edma);
 885         if (ret)
 886                 return ret;
 887
 888         fsl_edma->big_endian = of_property_read_bool(np, "big-endian");
 889
 890         INIT_LIST_HEAD(&fsl_edma->dma_dev.channels);
 891         for (i = 0; i < fsl_edma->n_chans; i++) {
 892                 struct fsl_edma_chan *fsl_chan = &fsl_edma->chans[i];
 893
 894                 fsl_chan->edma = fsl_edma;
 895
 896                 fsl_chan->vchan.desc_free = fsl_edma_free_desc;
 897                 vchan_init(&fsl_chan->vchan, &fsl_edma->dma_dev);
 898
 899                 edma_writew(fsl_edma, 0x0, fsl_edma->membase + EDMA_TCD_CSR(i));
 900                 fsl_edma_chan_mux(fsl_chan, 0, false);
 901         }
 902
 903         dma_cap_set(DMA_PRIVATE, fsl_edma->dma_dev.cap_mask);
 904         dma_cap_set(DMA_SLAVE, fsl_edma->dma_dev.cap_mask);
 905         dma_cap_set(DMA_CYCLIC, fsl_edma->dma_dev.cap_mask);
 906
 907         fsl_edma->dma_dev.dev = &pdev->dev;
 908         fsl_edma->dma_dev.device_alloc_chan_resources
 909                 = fsl_edma_alloc_chan_resources;
 910         fsl_edma->dma_dev.device_free_chan_resources
 911                 = fsl_edma_free_chan_resources;
 912         fsl_edma->dma_dev.device_tx_status = fsl_edma_tx_status;
 913         fsl_edma->dma_dev.device_prep_slave_sg = fsl_edma_prep_slave_sg;
 914         fsl_edma->dma_dev.device_prep_dma_cyclic = fsl_edma_prep_dma_cyclic;
 915         fsl_edma->dma_dev.device_config = fsl_edma_slave_config;
 916         fsl_edma->dma_dev.device_pause = fsl_edma_pause;
 917         fsl_edma->dma_dev.device_resume = fsl_edma_resume;
 918         fsl_edma->dma_dev.device_terminate_all = fsl_edma_terminate_all;
 919         fsl_edma->dma_dev.device_issue_pending = fsl_edma_issue_pending;
 920
 921         fsl_edma->dma_dev.src_addr_widths = FSL_EDMA_BUSWIDTHS;
 922         fsl_edma->dma_dev.dst_addr_widths = FSL_EDMA_BUSWIDTHS;
 923         fsl_edma->dma_dev.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
 924
 925         platform_set_drvdata(pdev, fsl_edma);
 926
 927         ret = dma_async_device_register(&fsl_edma->dma_dev);
 928         if (ret) {
 929                 dev_err(&pdev->dev, "Can't register Freescale eDMA engine.\n");
 930                 return ret;
 931         }
 932
 933         ret = of_dma_controller_register(np, fsl_edma_xlate, fsl_edma);
 934         if (ret) {
 935                 dev_err(&pdev->dev, "Can't register Freescale eDMA of_dma.\n");
 936                 dma_async_device_unregister(&fsl_edma->dma_dev);
 937                 return ret;
 938         }
 939
 940         /* enable round robin arbitration */
 941         edma_writel(fsl_edma, EDMA_CR_ERGA | EDMA_CR_ERCA, fsl_edma->membase + EDMA_CR);
 942
 943         return 0;
 944 }
 945
 946 static int fsl_edma_remove(struct platform_device *pdev)
 947 {
 948         struct device_node *np = pdev->dev.of_node;
 949         struct fsl_edma_engine *fsl_edma = platform_get_drvdata(pdev);
 950         int i;
 951
 952         of_dma_controller_free(np);
 953         dma_async_device_unregister(&fsl_edma->dma_dev);
 954
 955         for (i = 0; i < DMAMUX_NR; i++)
 956                 clk_disable_unprepare(fsl_edma->muxclk[i]);
 957
 958         return 0;
 959 }
 960
 961 static const struct of_device_id fsl_edma_dt_ids[] = {
 962         { .compatible = "fsl,vf610-edma", },
 963         { /* sentinel */ }
 964 };
 965 MODULE_DEVICE_TABLE(of, fsl_edma_dt_ids);
 966
 967 static struct platform_driver fsl_edma_driver = {
 968         .driver         = {
 969                 .name   = "fsl-edma",
 970                 .of_match_table = fsl_edma_dt_ids,
 971         },
 972         .probe          = fsl_edma_probe,
 973         .remove         = fsl_edma_remove,
 974 };
 975
 976 static int __init fsl_edma_init(void)
 977 {
 978         return platform_driver_register(&fsl_edma_driver);
 979 }
 980 subsys_initcall(fsl_edma_init);
 981
 982 static void __exit fsl_edma_exit(void)
 983 {
 984         platform_driver_unregister(&fsl_edma_driver);
 985 }
 986 module_exit(fsl_edma_exit);
 987
 988 MODULE_ALIAS("platform:fsl-edma");
 989 MODULE_DESCRIPTION("Freescale eDMA engine driver");
 990 MODULE_LICENSE("GPL v2");