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         u32     saddr;
 122         u16     soff;
 123         u16     attr;
 124         u32     nbytes;
 125         u32     slast;
 126         u32     daddr;
 127         u16     doff;
 128         u16     citer;
 129         u32     dlast_sga;
 130         u16     csr;
 131         u16     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  */
 181
 182 static u16 edma_readw(struct fsl_edma_engine *edma, void __iomem *addr)
 183 {
 184         if (edma->big_endian)
 185                 return ioread16be(addr);
 186         else
 187                 return ioread16(addr);
 188 }
 189
 190 static u32 edma_readl(struct fsl_edma_engine *edma, void __iomem *addr)
 191 {
 192         if (edma->big_endian)
 193                 return ioread32be(addr);
 194         else
 195                 return ioread32(addr);
 196 }
 197
 198 static void edma_writeb(struct fsl_edma_engine *edma, u8 val, void __iomem *addr)
 199 {
 200         iowrite8(val, addr);
 201 }
 202
 203 static void edma_writew(struct fsl_edma_engine *edma, u16 val, void __iomem *addr)
 204 {
 205         if (edma->big_endian)
 206                 iowrite16be(val, addr);
 207         else
 208                 iowrite16(val, addr);
 209 }
 210
 211 static void edma_writel(struct fsl_edma_engine *edma, u32 val, void __iomem *addr)
 212 {
 213         if (edma->big_endian)
 214                 iowrite32be(val, addr);
 215         else
 216                 iowrite32(val, addr);
 217 }
 218
 219 static struct fsl_edma_chan *to_fsl_edma_chan(struct dma_chan *chan)
 220 {
 221         return container_of(chan, struct fsl_edma_chan, vchan.chan);
 222 }
 223
 224 static struct fsl_edma_desc *to_fsl_edma_desc(struct virt_dma_desc *vd)
 225 {
 226         return container_of(vd, struct fsl_edma_desc, vdesc);
 227 }
 228
 229 static void fsl_edma_enable_request(struct fsl_edma_chan *fsl_chan)
 230 {
 231         void __iomem *addr = fsl_chan->edma->membase;
 232         u32 ch = fsl_chan->vchan.chan.chan_id;
 233
 234         edma_writeb(fsl_chan->edma, EDMA_SEEI_SEEI(ch), addr + EDMA_SEEI);
 235         edma_writeb(fsl_chan->edma, ch, addr + EDMA_SERQ);
 236 }
 237
 238 static void fsl_edma_disable_request(struct fsl_edma_chan *fsl_chan)
 239 {
 240         void __iomem *addr = fsl_chan->edma->membase;
 241         u32 ch = fsl_chan->vchan.chan.chan_id;
 242
 243         edma_writeb(fsl_chan->edma, ch, addr + EDMA_CERQ);
 244         edma_writeb(fsl_chan->edma, EDMA_CEEI_CEEI(ch), addr + EDMA_CEEI);
 245 }
 246
 247 static void fsl_edma_chan_mux(struct fsl_edma_chan *fsl_chan,
 248                         unsigned int slot, bool enable)
 249 {
 250         u32 ch = fsl_chan->vchan.chan.chan_id;
 251         void __iomem *muxaddr = fsl_chan->edma->muxbase[ch / DMAMUX_NR];
 252         unsigned chans_per_mux, ch_off;
 253
 254         chans_per_mux = fsl_chan->edma->n_chans / DMAMUX_NR;
 255         ch_off = fsl_chan->vchan.chan.chan_id % chans_per_mux;
 256
 257         if (enable)
 258                 edma_writeb(fsl_chan->edma,
 259                                 EDMAMUX_CHCFG_ENBL | EDMAMUX_CHCFG_SOURCE(slot),
 260                                 muxaddr + ch_off);
 261         else
 262                 edma_writeb(fsl_chan->edma, EDMAMUX_CHCFG_DIS, muxaddr + ch_off);
 263 }
 264
 265 static unsigned int fsl_edma_get_tcd_attr(enum dma_slave_buswidth addr_width)
 266 {
 267         switch (addr_width) {
 268         case 1:
 269                 return EDMA_TCD_ATTR_SSIZE_8BIT | EDMA_TCD_ATTR_DSIZE_8BIT;
 270         case 2:
 271                 return EDMA_TCD_ATTR_SSIZE_16BIT | EDMA_TCD_ATTR_DSIZE_16BIT;
 272         case 4:
 273                 return EDMA_TCD_ATTR_SSIZE_32BIT | EDMA_TCD_ATTR_DSIZE_32BIT;
 274         case 8:
 275                 return EDMA_TCD_ATTR_SSIZE_64BIT | EDMA_TCD_ATTR_DSIZE_64BIT;
 276         default:
 277                 return EDMA_TCD_ATTR_SSIZE_32BIT | EDMA_TCD_ATTR_DSIZE_32BIT;
 278         }
 279 }
 280
 281 static void fsl_edma_free_desc(struct virt_dma_desc *vdesc)
 282 {
 283         struct fsl_edma_desc *fsl_desc;
 284         int i;
 285
 286         fsl_desc = to_fsl_edma_desc(vdesc);
 287         for (i = 0; i < fsl_desc->n_tcds; i++)
 288                         dma_pool_free(fsl_desc->echan->tcd_pool,
 289                                         fsl_desc->tcd[i].vtcd,
 290                                         fsl_desc->tcd[i].ptcd);
 291         kfree(fsl_desc);
 292 }
 293
 294 static int fsl_edma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
 295                 unsigned long arg)
 296 {
 297         struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
 298         struct dma_slave_config *cfg = (void *)arg;
 299         unsigned long flags;
 300         LIST_HEAD(head);
 301
 302         switch (cmd) {
 303         case DMA_TERMINATE_ALL:
 304                 spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
 305                 fsl_edma_disable_request(fsl_chan);
 306                 fsl_chan->edesc = NULL;
 307                 vchan_get_all_descriptors(&fsl_chan->vchan, &head);
 308                 spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
 309                 vchan_dma_desc_free_list(&fsl_chan->vchan, &head);
 310                 return 0;
 311
 312         case DMA_SLAVE_CONFIG:
 313                 fsl_chan->fsc.dir = cfg->direction;
 314                 if (cfg->direction == DMA_DEV_TO_MEM) {
 315                         fsl_chan->fsc.dev_addr = cfg->src_addr;
 316                         fsl_chan->fsc.addr_width = cfg->src_addr_width;
 317                         fsl_chan->fsc.burst = cfg->src_maxburst;
 318                         fsl_chan->fsc.attr = fsl_edma_get_tcd_attr(cfg->src_addr_width);
 319                 } else if (cfg->direction == DMA_MEM_TO_DEV) {
 320                         fsl_chan->fsc.dev_addr = cfg->dst_addr;
 321                         fsl_chan->fsc.addr_width = cfg->dst_addr_width;
 322                         fsl_chan->fsc.burst = cfg->dst_maxburst;
 323                         fsl_chan->fsc.attr = fsl_edma_get_tcd_attr(cfg->dst_addr_width);
 324                 } else {
 325                         return -EINVAL;
 326                 }
 327                 return 0;
 328
 329         case DMA_PAUSE:
 330                 spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
 331                 if (fsl_chan->edesc) {
 332                         fsl_edma_disable_request(fsl_chan);
 333                         fsl_chan->status = DMA_PAUSED;
 334                 }
 335                 spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
 336                 return 0;
 337
 338         case DMA_RESUME:
 339                 spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
 340                 if (fsl_chan->edesc) {
 341                         fsl_edma_enable_request(fsl_chan);
 342                         fsl_chan->status = DMA_IN_PROGRESS;
 343                 }
 344                 spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
 345                 return 0;
 346
 347         default:
 348                 return -ENXIO;
 349         }
 350 }
 351
 352 static size_t fsl_edma_desc_residue(struct fsl_edma_chan *fsl_chan,
 353                 struct virt_dma_desc *vdesc, bool in_progress)
 354 {
 355         struct fsl_edma_desc *edesc = fsl_chan->edesc;
 356         void __iomem *addr = fsl_chan->edma->membase;
 357         u32 ch = fsl_chan->vchan.chan.chan_id;
 358         enum dma_transfer_direction dir = fsl_chan->fsc.dir;
 359         dma_addr_t cur_addr, dma_addr;
 360         size_t len, size;
 361         int i;
 362
 363         /* calculate the total size in this desc */
 364         for (len = i = 0; i < fsl_chan->edesc->n_tcds; i++)
 365                 len += edma_readl(fsl_chan->edma, &(edesc->tcd[i].vtcd->nbytes))
 366                         * edma_readw(fsl_chan->edma, &(edesc->tcd[i].vtcd->biter));
 367
 368         if (!in_progress)
 369                 return len;
 370
 371         if (dir == DMA_MEM_TO_DEV)
 372                 cur_addr = edma_readl(fsl_chan->edma, addr + EDMA_TCD_SADDR(ch));
 373         else
 374                 cur_addr = edma_readl(fsl_chan->edma, addr + EDMA_TCD_DADDR(ch));
 375
 376         /* figure out the finished and calculate the residue */
 377         for (i = 0; i < fsl_chan->edesc->n_tcds; i++) {
 378                 size = edma_readl(fsl_chan->edma, &(edesc->tcd[i].vtcd->nbytes))
 379                         * edma_readw(fsl_chan->edma, &(edesc->tcd[i].vtcd->biter));
 380                 if (dir == DMA_MEM_TO_DEV)
 381                         dma_addr = edma_readl(fsl_chan->edma,
 382                                         &(edesc->tcd[i].vtcd->saddr));
 383                 else
 384                         dma_addr = edma_readl(fsl_chan->edma,
 385                                         &(edesc->tcd[i].vtcd->daddr));
 386
 387                 len -= size;
 388                 if (cur_addr > dma_addr && cur_addr < dma_addr + size) {
 389                         len += dma_addr + size - cur_addr;
 390                         break;
 391                 }
 392         }
 393
 394         return len;
 395 }
 396
 397 static enum dma_status fsl_edma_tx_status(struct dma_chan *chan,
 398                 dma_cookie_t cookie, struct dma_tx_state *txstate)
 399 {
 400         struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
 401         struct virt_dma_desc *vdesc;
 402         enum dma_status status;
 403         unsigned long flags;
 404
 405         status = dma_cookie_status(chan, cookie, txstate);
 406         if (status == DMA_COMPLETE)
 407                 return status;
 408
 409         if (!txstate)
 410                 return fsl_chan->status;
 411
 412         spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
 413         vdesc = vchan_find_desc(&fsl_chan->vchan, cookie);
 414         if (fsl_chan->edesc && cookie == fsl_chan->edesc->vdesc.tx.cookie)
 415                 txstate->residue = fsl_edma_desc_residue(fsl_chan, vdesc, true);
 416         else if (vdesc)
 417                 txstate->residue = fsl_edma_desc_residue(fsl_chan, vdesc, false);
 418         else
 419                 txstate->residue = 0;
 420
 421         spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
 422
 423         return fsl_chan->status;
 424 }
 425
 426 static void fsl_edma_set_tcd_params(struct fsl_edma_chan *fsl_chan,
 427                 u32 src, u32 dst, u16 attr, u16 soff, u32 nbytes,
 428                 u32 slast, u16 citer, u16 biter, u32 doff, u32 dlast_sga,
 429                 u16 csr)
 430 {
 431         void __iomem *addr = fsl_chan->edma->membase;
 432         u32 ch = fsl_chan->vchan.chan.chan_id;
 433
 434         /*
 435          * TCD parameters have been swapped in fill_tcd_params(),
 436          * so just write them to registers in the cpu endian here
 437          */
 438         writew(0, addr + EDMA_TCD_CSR(ch));
 439         writel(src, addr + EDMA_TCD_SADDR(ch));
 440         writel(dst, addr + EDMA_TCD_DADDR(ch));
 441         writew(attr, addr + EDMA_TCD_ATTR(ch));
 442         writew(soff, addr + EDMA_TCD_SOFF(ch));
 443         writel(nbytes, addr + EDMA_TCD_NBYTES(ch));
 444         writel(slast, addr + EDMA_TCD_SLAST(ch));
 445         writew(citer, addr + EDMA_TCD_CITER(ch));
 446         writew(biter, addr + EDMA_TCD_BITER(ch));
 447         writew(doff, addr + EDMA_TCD_DOFF(ch));
 448         writel(dlast_sga, addr + EDMA_TCD_DLAST_SGA(ch));
 449         writew(csr, addr + EDMA_TCD_CSR(ch));
 450 }
 451
 452 static void fill_tcd_params(struct fsl_edma_engine *edma,
 453                 struct fsl_edma_hw_tcd *tcd, u32 src, u32 dst,
 454                 u16 attr, u16 soff, u32 nbytes, u32 slast, u16 citer,
 455                 u16 biter, u16 doff, u32 dlast_sga, bool major_int,
 456                 bool disable_req, bool enable_sg)
 457 {
 458         u16 csr = 0;
 459
 460         /*
 461          * eDMA hardware SGs require the TCD parameters stored in memory
 462          * the same endian as the eDMA module so that they can be loaded
 463          * automatically by the engine
 464          */
 465         edma_writel(edma, src, &(tcd->saddr));
 466         edma_writel(edma, dst, &(tcd->daddr));
 467         edma_writew(edma, attr, &(tcd->attr));
 468         edma_writew(edma, EDMA_TCD_SOFF_SOFF(soff), &(tcd->soff));
 469         edma_writel(edma, EDMA_TCD_NBYTES_NBYTES(nbytes), &(tcd->nbytes));
 470         edma_writel(edma, EDMA_TCD_SLAST_SLAST(slast), &(tcd->slast));
 471         edma_writew(edma, EDMA_TCD_CITER_CITER(citer), &(tcd->citer));
 472         edma_writew(edma, EDMA_TCD_DOFF_DOFF(doff), &(tcd->doff));
 473         edma_writel(edma, EDMA_TCD_DLAST_SGA_DLAST_SGA(dlast_sga), &(tcd->dlast_sga));
 474         edma_writew(edma, EDMA_TCD_BITER_BITER(biter), &(tcd->biter));
 475         if (major_int)
 476                 csr |= EDMA_TCD_CSR_INT_MAJOR;
 477
 478         if (disable_req)
 479                 csr |= EDMA_TCD_CSR_D_REQ;
 480
 481         if (enable_sg)
 482                 csr |= EDMA_TCD_CSR_E_SG;
 483
 484         edma_writew(edma, csr, &(tcd->csr));
 485 }
 486
 487 static struct fsl_edma_desc *fsl_edma_alloc_desc(struct fsl_edma_chan *fsl_chan,
 488                 int sg_len)
 489 {
 490         struct fsl_edma_desc *fsl_desc;
 491         int i;
 492
 493         fsl_desc = kzalloc(sizeof(*fsl_desc) + sizeof(struct fsl_edma_sw_tcd) * sg_len,
 494                                 GFP_NOWAIT);
 495         if (!fsl_desc)
 496                 return NULL;
 497
 498         fsl_desc->echan = fsl_chan;
 499         fsl_desc->n_tcds = sg_len;
 500         for (i = 0; i < sg_len; i++) {
 501                 fsl_desc->tcd[i].vtcd = dma_pool_alloc(fsl_chan->tcd_pool,
 502                                         GFP_NOWAIT, &fsl_desc->tcd[i].ptcd);
 503                 if (!fsl_desc->tcd[i].vtcd)
 504                         goto err;
 505         }
 506         return fsl_desc;
 507
 508 err:
 509         while (--i >= 0)
 510                 dma_pool_free(fsl_chan->tcd_pool, fsl_desc->tcd[i].vtcd,
 511                                 fsl_desc->tcd[i].ptcd);
 512         kfree(fsl_desc);
 513         return NULL;
 514 }
 515
 516 static struct dma_async_tx_descriptor *fsl_edma_prep_dma_cyclic(
 517                 struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len,
 518                 size_t period_len, enum dma_transfer_direction direction,
 519                 unsigned long flags, void *context)
 520 {
 521         struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
 522         struct fsl_edma_desc *fsl_desc;
 523         dma_addr_t dma_buf_next;
 524         int sg_len, i;
 525         u32 src_addr, dst_addr, last_sg, nbytes;
 526         u16 soff, doff, iter;
 527
 528         if (!is_slave_direction(fsl_chan->fsc.dir))
 529                 return NULL;
 530
 531         sg_len = buf_len / period_len;
 532         fsl_desc = fsl_edma_alloc_desc(fsl_chan, sg_len);
 533         if (!fsl_desc)
 534                 return NULL;
 535         fsl_desc->iscyclic = true;
 536
 537         dma_buf_next = dma_addr;
 538         nbytes = fsl_chan->fsc.addr_width * fsl_chan->fsc.burst;
 539         iter = period_len / nbytes;
 540
 541         for (i = 0; i < sg_len; i++) {
 542                 if (dma_buf_next >= dma_addr + buf_len)
 543                         dma_buf_next = dma_addr;
 544
 545                 /* get next sg's physical address */
 546                 last_sg = fsl_desc->tcd[(i + 1) % sg_len].ptcd;
 547
 548                 if (fsl_chan->fsc.dir == DMA_MEM_TO_DEV) {
 549                         src_addr = dma_buf_next;
 550                         dst_addr = fsl_chan->fsc.dev_addr;
 551                         soff = fsl_chan->fsc.addr_width;
 552                         doff = 0;
 553                 } else {
 554                         src_addr = fsl_chan->fsc.dev_addr;
 555                         dst_addr = dma_buf_next;
 556                         soff = 0;
 557                         doff = fsl_chan->fsc.addr_width;
 558                 }
 559
 560                 fill_tcd_params(fsl_chan->edma, fsl_desc->tcd[i].vtcd, src_addr,
 561                                 dst_addr, fsl_chan->fsc.attr, soff, nbytes, 0,
 562                                 iter, iter, doff, last_sg, true, false, true);
 563                 dma_buf_next += period_len;
 564         }
 565
 566         return vchan_tx_prep(&fsl_chan->vchan, &fsl_desc->vdesc, flags);
 567 }
 568
 569 static struct dma_async_tx_descriptor *fsl_edma_prep_slave_sg(
 570                 struct dma_chan *chan, struct scatterlist *sgl,
 571                 unsigned int sg_len, enum dma_transfer_direction direction,
 572                 unsigned long flags, void *context)
 573 {
 574         struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
 575         struct fsl_edma_desc *fsl_desc;
 576         struct scatterlist *sg;
 577         u32 src_addr, dst_addr, last_sg, nbytes;
 578         u16 soff, doff, iter;
 579         int i;
 580
 581         if (!is_slave_direction(fsl_chan->fsc.dir))
 582                 return NULL;
 583
 584         fsl_desc = fsl_edma_alloc_desc(fsl_chan, sg_len);
 585         if (!fsl_desc)
 586                 return NULL;
 587         fsl_desc->iscyclic = false;
 588
 589         nbytes = fsl_chan->fsc.addr_width * fsl_chan->fsc.burst;
 590         for_each_sg(sgl, sg, sg_len, i) {
 591                 /* get next sg's physical address */
 592                 last_sg = fsl_desc->tcd[(i + 1) % sg_len].ptcd;
 593
 594                 if (fsl_chan->fsc.dir == DMA_MEM_TO_DEV) {
 595                         src_addr = sg_dma_address(sg);
 596                         dst_addr = fsl_chan->fsc.dev_addr;
 597                         soff = fsl_chan->fsc.addr_width;
 598                         doff = 0;
 599                 } else {
 600                         src_addr = fsl_chan->fsc.dev_addr;
 601                         dst_addr = sg_dma_address(sg);
 602                         soff = 0;
 603                         doff = fsl_chan->fsc.addr_width;
 604                 }
 605
 606                 iter = sg_dma_len(sg) / nbytes;
 607                 if (i < sg_len - 1) {
 608                         last_sg = fsl_desc->tcd[(i + 1)].ptcd;
 609                         fill_tcd_params(fsl_chan->edma, fsl_desc->tcd[i].vtcd,
 610                                         src_addr, dst_addr, fsl_chan->fsc.attr,
 611                                         soff, nbytes, 0, iter, iter, doff, last_sg,
 612                                         false, false, true);
 613                 } else {
 614                         last_sg = 0;
 615                         fill_tcd_params(fsl_chan->edma, fsl_desc->tcd[i].vtcd,
 616                                         src_addr, dst_addr, fsl_chan->fsc.attr,
 617                                         soff, nbytes, 0, iter, iter, doff, last_sg,
 618                                         true, true, false);
 619                 }
 620         }
 621
 622         return vchan_tx_prep(&fsl_chan->vchan, &fsl_desc->vdesc, flags);
 623 }
 624
 625 static void fsl_edma_xfer_desc(struct fsl_edma_chan *fsl_chan)
 626 {
 627         struct fsl_edma_hw_tcd *tcd;
 628         struct virt_dma_desc *vdesc;
 629
 630         vdesc = vchan_next_desc(&fsl_chan->vchan);
 631         if (!vdesc)
 632                 return;
 633         fsl_chan->edesc = to_fsl_edma_desc(vdesc);
 634         tcd = fsl_chan->edesc->tcd[0].vtcd;
 635         fsl_edma_set_tcd_params(fsl_chan, tcd->saddr, tcd->daddr, tcd->attr,
 636                         tcd->soff, tcd->nbytes, tcd->slast, tcd->citer,
 637                         tcd->biter, tcd->doff, tcd->dlast_sga, tcd->csr);
 638         fsl_edma_enable_request(fsl_chan);
 639         fsl_chan->status = DMA_IN_PROGRESS;
 640 }
 641
 642 static irqreturn_t fsl_edma_tx_handler(int irq, void *dev_id)
 643 {
 644         struct fsl_edma_engine *fsl_edma = dev_id;
 645         unsigned int intr, ch;
 646         void __iomem *base_addr;
 647         struct fsl_edma_chan *fsl_chan;
 648
 649         base_addr = fsl_edma->membase;
 650
 651         intr = edma_readl(fsl_edma, base_addr + EDMA_INTR);
 652         if (!intr)
 653                 return IRQ_NONE;
 654
 655         for (ch = 0; ch < fsl_edma->n_chans; ch++) {
 656                 if (intr & (0x1 << ch)) {
 657                         edma_writeb(fsl_edma, EDMA_CINT_CINT(ch),
 658                                 base_addr + EDMA_CINT);
 659
 660                         fsl_chan = &fsl_edma->chans[ch];
 661
 662                         spin_lock(&fsl_chan->vchan.lock);
 663                         if (!fsl_chan->edesc->iscyclic) {
 664                                 list_del(&fsl_chan->edesc->vdesc.node);
 665                                 vchan_cookie_complete(&fsl_chan->edesc->vdesc);
 666                                 fsl_chan->edesc = NULL;
 667                                 fsl_chan->status = DMA_COMPLETE;
 668                         } else {
 669                                 vchan_cyclic_callback(&fsl_chan->edesc->vdesc);
 670                         }
 671
 672                         if (!fsl_chan->edesc)
 673                                 fsl_edma_xfer_desc(fsl_chan);
 674
 675                         spin_unlock(&fsl_chan->vchan.lock);
 676                 }
 677         }
 678         return IRQ_HANDLED;
 679 }
 680
 681 static irqreturn_t fsl_edma_err_handler(int irq, void *dev_id)
 682 {
 683         struct fsl_edma_engine *fsl_edma = dev_id;
 684         unsigned int err, ch;
 685
 686         err = edma_readl(fsl_edma, fsl_edma->membase + EDMA_ERR);
 687         if (!err)
 688                 return IRQ_NONE;
 689
 690         for (ch = 0; ch < fsl_edma->n_chans; ch++) {
 691                 if (err & (0x1 << ch)) {
 692                         fsl_edma_disable_request(&fsl_edma->chans[ch]);
 693                         edma_writeb(fsl_edma, EDMA_CERR_CERR(ch),
 694                                 fsl_edma->membase + EDMA_CERR);
 695                         fsl_edma->chans[ch].status = DMA_ERROR;
 696                 }
 697         }
 698         return IRQ_HANDLED;
 699 }
 700
 701 static irqreturn_t fsl_edma_irq_handler(int irq, void *dev_id)
 702 {
 703         if (fsl_edma_tx_handler(irq, dev_id) == IRQ_HANDLED)
 704                 return IRQ_HANDLED;
 705
 706         return fsl_edma_err_handler(irq, dev_id);
 707 }
 708
 709 static void fsl_edma_issue_pending(struct dma_chan *chan)
 710 {
 711         struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
 712         unsigned long flags;
 713
 714         spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
 715
 716         if (vchan_issue_pending(&fsl_chan->vchan) && !fsl_chan->edesc)
 717                 fsl_edma_xfer_desc(fsl_chan);
 718
 719         spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
 720 }
 721
 722 static struct dma_chan *fsl_edma_xlate(struct of_phandle_args *dma_spec,
 723                 struct of_dma *ofdma)
 724 {
 725         struct fsl_edma_engine *fsl_edma = ofdma->of_dma_data;
 726         struct dma_chan *chan, *_chan;
 727
 728         if (dma_spec->args_count != 2)
 729                 return NULL;
 730
 731         mutex_lock(&fsl_edma->fsl_edma_mutex);
 732         list_for_each_entry_safe(chan, _chan, &fsl_edma->dma_dev.channels, device_node) {
 733                 if (chan->client_count)
 734                         continue;
 735                 if ((chan->chan_id / DMAMUX_NR) == dma_spec->args[0]) {
 736                         chan = dma_get_slave_channel(chan);
 737                         if (chan) {
 738                                 chan->device->privatecnt++;
 739                                 fsl_edma_chan_mux(to_fsl_edma_chan(chan),
 740                                         dma_spec->args[1], true);
 741                                 mutex_unlock(&fsl_edma->fsl_edma_mutex);
 742                                 return chan;
 743                         }
 744                 }
 745         }
 746         mutex_unlock(&fsl_edma->fsl_edma_mutex);
 747         return NULL;
 748 }
 749
 750 static int fsl_edma_alloc_chan_resources(struct dma_chan *chan)
 751 {
 752         struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
 753
 754         fsl_chan->tcd_pool = dma_pool_create("tcd_pool", chan->device->dev,
 755                                 sizeof(struct fsl_edma_hw_tcd),
 756                                 32, 0);
 757         return 0;
 758 }
 759
 760 static void fsl_edma_free_chan_resources(struct dma_chan *chan)
 761 {
 762         struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
 763         unsigned long flags;
 764         LIST_HEAD(head);
 765
 766         spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
 767         fsl_edma_disable_request(fsl_chan);
 768         fsl_edma_chan_mux(fsl_chan, 0, false);
 769         fsl_chan->edesc = NULL;
 770         vchan_get_all_descriptors(&fsl_chan->vchan, &head);
 771         spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
 772
 773         vchan_dma_desc_free_list(&fsl_chan->vchan, &head);
 774         dma_pool_destroy(fsl_chan->tcd_pool);
 775         fsl_chan->tcd_pool = NULL;
 776 }
 777
 778 static int fsl_dma_device_slave_caps(struct dma_chan *dchan,
 779                 struct dma_slave_caps *caps)
 780 {
 781         caps->src_addr_widths = FSL_EDMA_BUSWIDTHS;
 782         caps->dstn_addr_widths = FSL_EDMA_BUSWIDTHS;
 783         caps->directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
 784         caps->cmd_pause = true;
 785         caps->cmd_terminate = true;
 786
 787         return 0;
 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_control = fsl_edma_control;
 916         fsl_edma->dma_dev.device_issue_pending = fsl_edma_issue_pending;
 917         fsl_edma->dma_dev.device_slave_caps = fsl_dma_device_slave_caps;
 918
 919         platform_set_drvdata(pdev, fsl_edma);
 920
 921         ret = dma_async_device_register(&fsl_edma->dma_dev);
 922         if (ret) {
 923                 dev_err(&pdev->dev, "Can't register Freescale eDMA engine.\n");
 924                 return ret;
 925         }
 926
 927         ret = of_dma_controller_register(np, fsl_edma_xlate, fsl_edma);
 928         if (ret) {
 929                 dev_err(&pdev->dev, "Can't register Freescale eDMA of_dma.\n");
 930                 dma_async_device_unregister(&fsl_edma->dma_dev);
 931                 return ret;
 932         }
 933
 934         /* enable round robin arbitration */
 935         edma_writel(fsl_edma, EDMA_CR_ERGA | EDMA_CR_ERCA, fsl_edma->membase + EDMA_CR);
 936
 937         return 0;
 938 }
 939
 940 static int fsl_edma_remove(struct platform_device *pdev)
 941 {
 942         struct device_node *np = pdev->dev.of_node;
 943         struct fsl_edma_engine *fsl_edma = platform_get_drvdata(pdev);
 944         int i;
 945
 946         of_dma_controller_free(np);
 947         dma_async_device_unregister(&fsl_edma->dma_dev);
 948
 949         for (i = 0; i < DMAMUX_NR; i++)
 950                 clk_disable_unprepare(fsl_edma->muxclk[i]);
 951
 952         return 0;
 953 }
 954
 955 static const struct of_device_id fsl_edma_dt_ids[] = {
 956         { .compatible = "fsl,vf610-edma", },
 957         { /* sentinel */ }
 958 };
 959 MODULE_DEVICE_TABLE(of, fsl_edma_dt_ids);
 960
 961 static struct platform_driver fsl_edma_driver = {
 962         .driver         = {
 963                 .name   = "fsl-edma",
 964                 .owner  = THIS_MODULE,
 965                 .of_match_table = fsl_edma_dt_ids,
 966         },
 967         .probe          = fsl_edma_probe,
 968         .remove         = fsl_edma_remove,
 969 };
 970
 971 static int __init fsl_edma_init(void)
 972 {
 973         return platform_driver_register(&fsl_edma_driver);
 974 }
 975 subsys_initcall(fsl_edma_init);
 976
 977 static void __exit fsl_edma_exit(void)
 978 {
 979         platform_driver_unregister(&fsl_edma_driver);
 980 }
 981 module_exit(fsl_edma_exit);
 982
 983 MODULE_ALIAS("platform:fsl-edma");
 984 MODULE_DESCRIPTION("Freescale eDMA engine driver");
 985 MODULE_LICENSE("GPL v2");