drivers/dma/pl330.c

   1 /*
   2  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
   3  *              http://www.samsung.com
   4  *
   5  * Copyright (C) 2010 Samsung Electronics Co. Ltd.
   6  *      Jaswinder Singh <jassi.brar@samsung.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/io.h>
  16 #include <linux/init.h>
  17 #include <linux/slab.h>
  18 #include <linux/module.h>
  19 #include <linux/string.h>
  20 #include <linux/delay.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/dma-mapping.h>
  23 #include <linux/dmaengine.h>
  24 #include <linux/amba/bus.h>
  25 #include <linux/scatterlist.h>
  26 #include <linux/of.h>
  27 #include <linux/of_dma.h>
  28 #include <linux/err.h>
  29 #include <linux/pm_runtime.h>
  30
  31 #include "dmaengine.h"
  32 #define PL330_MAX_CHAN          8
  33 #define PL330_MAX_IRQS          32
  34 #define PL330_MAX_PERI          32
  35 #define PL330_MAX_BURST         16
  36
  37 #define PL330_QUIRK_BROKEN_NO_FLUSHP BIT(0)
  38
  39 enum pl330_cachectrl {
  40         CCTRL0,         /* Noncacheable and nonbufferable */
  41         CCTRL1,         /* Bufferable only */
  42         CCTRL2,         /* Cacheable, but do not allocate */
  43         CCTRL3,         /* Cacheable and bufferable, but do not allocate */
  44         INVALID1,       /* AWCACHE = 0x1000 */
  45         INVALID2,
  46         CCTRL6,         /* Cacheable write-through, allocate on writes only */
  47         CCTRL7,         /* Cacheable write-back, allocate on writes only */
  48 };
  49
  50 enum pl330_byteswap {
  51         SWAP_NO,
  52         SWAP_2,
  53         SWAP_4,
  54         SWAP_8,
  55         SWAP_16,
  56 };
  57
  58 /* Register and Bit field Definitions */
  59 #define DS                      0x0
  60 #define DS_ST_STOP              0x0
  61 #define DS_ST_EXEC              0x1
  62 #define DS_ST_CMISS             0x2
  63 #define DS_ST_UPDTPC            0x3
  64 #define DS_ST_WFE               0x4
  65 #define DS_ST_ATBRR             0x5
  66 #define DS_ST_QBUSY             0x6
  67 #define DS_ST_WFP               0x7
  68 #define DS_ST_KILL              0x8
  69 #define DS_ST_CMPLT             0x9
  70 #define DS_ST_FLTCMP            0xe
  71 #define DS_ST_FAULT             0xf
  72
  73 #define DPC                     0x4
  74 #define INTEN                   0x20
  75 #define ES                      0x24
  76 #define INTSTATUS               0x28
  77 #define INTCLR                  0x2c
  78 #define FSM                     0x30
  79 #define FSC                     0x34
  80 #define FTM                     0x38
  81
  82 #define _FTC                    0x40
  83 #define FTC(n)                  (_FTC + (n)*0x4)
  84
  85 #define _CS                     0x100
  86 #define CS(n)                   (_CS + (n)*0x8)
  87 #define CS_CNS                  (1 << 21)
  88
  89 #define _CPC                    0x104
  90 #define CPC(n)                  (_CPC + (n)*0x8)
  91
  92 #define _SA                     0x400
  93 #define SA(n)                   (_SA + (n)*0x20)
  94
  95 #define _DA                     0x404
  96 #define DA(n)                   (_DA + (n)*0x20)
  97
  98 #define _CC                     0x408
  99 #define CC(n)                   (_CC + (n)*0x20)
 100
 101 #define CC_SRCINC               (1 << 0)
 102 #define CC_DSTINC               (1 << 14)
 103 #define CC_SRCPRI               (1 << 8)
 104 #define CC_DSTPRI               (1 << 22)
 105 #define CC_SRCNS                (1 << 9)
 106 #define CC_DSTNS                (1 << 23)
 107 #define CC_SRCIA                (1 << 10)
 108 #define CC_DSTIA                (1 << 24)
 109 #define CC_SRCBRSTLEN_SHFT      4
 110 #define CC_DSTBRSTLEN_SHFT      18
 111 #define CC_SRCBRSTSIZE_SHFT     1
 112 #define CC_DSTBRSTSIZE_SHFT     15
 113 #define CC_SRCCCTRL_SHFT        11
 114 #define CC_SRCCCTRL_MASK        0x7
 115 #define CC_DSTCCTRL_SHFT        25
 116 #define CC_DRCCCTRL_MASK        0x7
 117 #define CC_SWAP_SHFT            28
 118
 119 #define _LC0                    0x40c
 120 #define LC0(n)                  (_LC0 + (n)*0x20)
 121
 122 #define _LC1                    0x410
 123 #define LC1(n)                  (_LC1 + (n)*0x20)
 124
 125 #define DBGSTATUS               0xd00
 126 #define DBG_BUSY                (1 << 0)
 127
 128 #define DBGCMD                  0xd04
 129 #define DBGINST0                0xd08
 130 #define DBGINST1                0xd0c
 131
 132 #define CR0                     0xe00
 133 #define CR1                     0xe04
 134 #define CR2                     0xe08
 135 #define CR3                     0xe0c
 136 #define CR4                     0xe10
 137 #define CRD                     0xe14
 138
 139 #define PERIPH_ID               0xfe0
 140 #define PERIPH_REV_SHIFT        20
 141 #define PERIPH_REV_MASK         0xf
 142 #define PERIPH_REV_R0P0         0
 143 #define PERIPH_REV_R1P0         1
 144 #define PERIPH_REV_R1P1         2
 145
 146 #define CR0_PERIPH_REQ_SET      (1 << 0)
 147 #define CR0_BOOT_EN_SET         (1 << 1)
 148 #define CR0_BOOT_MAN_NS         (1 << 2)
 149 #define CR0_NUM_CHANS_SHIFT     4
 150 #define CR0_NUM_CHANS_MASK      0x7
 151 #define CR0_NUM_PERIPH_SHIFT    12
 152 #define CR0_NUM_PERIPH_MASK     0x1f
 153 #define CR0_NUM_EVENTS_SHIFT    17
 154 #define CR0_NUM_EVENTS_MASK     0x1f
 155
 156 #define CR1_ICACHE_LEN_SHIFT    0
 157 #define CR1_ICACHE_LEN_MASK     0x7
 158 #define CR1_NUM_ICACHELINES_SHIFT       4
 159 #define CR1_NUM_ICACHELINES_MASK        0xf
 160
 161 #define CRD_DATA_WIDTH_SHIFT    0
 162 #define CRD_DATA_WIDTH_MASK     0x7
 163 #define CRD_WR_CAP_SHIFT        4
 164 #define CRD_WR_CAP_MASK         0x7
 165 #define CRD_WR_Q_DEP_SHIFT      8
 166 #define CRD_WR_Q_DEP_MASK       0xf
 167 #define CRD_RD_CAP_SHIFT        12
 168 #define CRD_RD_CAP_MASK         0x7
 169 #define CRD_RD_Q_DEP_SHIFT      16
 170 #define CRD_RD_Q_DEP_MASK       0xf
 171 #define CRD_DATA_BUFF_SHIFT     20
 172 #define CRD_DATA_BUFF_MASK      0x3ff
 173
 174 #define PART                    0x330
 175 #define DESIGNER                0x41
 176 #define REVISION                0x0
 177 #define INTEG_CFG               0x0
 178 #define PERIPH_ID_VAL           ((PART << 0) | (DESIGNER << 12))
 179
 180 #define PL330_STATE_STOPPED             (1 << 0)
 181 #define PL330_STATE_EXECUTING           (1 << 1)
 182 #define PL330_STATE_WFE                 (1 << 2)
 183 #define PL330_STATE_FAULTING            (1 << 3)
 184 #define PL330_STATE_COMPLETING          (1 << 4)
 185 #define PL330_STATE_WFP                 (1 << 5)
 186 #define PL330_STATE_KILLING             (1 << 6)
 187 #define PL330_STATE_FAULT_COMPLETING    (1 << 7)
 188 #define PL330_STATE_CACHEMISS           (1 << 8)
 189 #define PL330_STATE_UPDTPC              (1 << 9)
 190 #define PL330_STATE_ATBARRIER           (1 << 10)
 191 #define PL330_STATE_QUEUEBUSY           (1 << 11)
 192 #define PL330_STATE_INVALID             (1 << 15)
 193
 194 #define PL330_STABLE_STATES (PL330_STATE_STOPPED | PL330_STATE_EXECUTING \
 195                                 | PL330_STATE_WFE | PL330_STATE_FAULTING)
 196
 197 #define CMD_DMAADDH             0x54
 198 #define CMD_DMAEND              0x00
 199 #define CMD_DMAFLUSHP           0x35
 200 #define CMD_DMAGO               0xa0
 201 #define CMD_DMALD               0x04
 202 #define CMD_DMALDP              0x25
 203 #define CMD_DMALP               0x20
 204 #define CMD_DMALPEND            0x28
 205 #define CMD_DMAKILL             0x01
 206 #define CMD_DMAMOV              0xbc
 207 #define CMD_DMANOP              0x18
 208 #define CMD_DMARMB              0x12
 209 #define CMD_DMASEV              0x34
 210 #define CMD_DMAST               0x08
 211 #define CMD_DMASTP              0x29
 212 #define CMD_DMASTZ              0x0c
 213 #define CMD_DMAWFE              0x36
 214 #define CMD_DMAWFP              0x30
 215 #define CMD_DMAWMB              0x13
 216
 217 #define SZ_DMAADDH              3
 218 #define SZ_DMAEND               1
 219 #define SZ_DMAFLUSHP            2
 220 #define SZ_DMALD                1
 221 #define SZ_DMALDP               2
 222 #define SZ_DMALP                2
 223 #define SZ_DMALPEND             2
 224 #define SZ_DMAKILL              1
 225 #define SZ_DMAMOV               6
 226 #define SZ_DMANOP               1
 227 #define SZ_DMARMB               1
 228 #define SZ_DMASEV               2
 229 #define SZ_DMAST                1
 230 #define SZ_DMASTP               2
 231 #define SZ_DMASTZ               1
 232 #define SZ_DMAWFE               2
 233 #define SZ_DMAWFP               2
 234 #define SZ_DMAWMB               1
 235 #define SZ_DMAGO                6
 236
 237 #define BRST_LEN(ccr)           ((((ccr) >> CC_SRCBRSTLEN_SHFT) & 0xf) + 1)
 238 #define BRST_SIZE(ccr)          (1 << (((ccr) >> CC_SRCBRSTSIZE_SHFT) & 0x7))
 239
 240 #define BYTE_TO_BURST(b, ccr)   ((b) / BRST_SIZE(ccr) / BRST_LEN(ccr))
 241 #define BURST_TO_BYTE(c, ccr)   ((c) * BRST_SIZE(ccr) * BRST_LEN(ccr))
 242
 243 /*
 244  * With 256 bytes, we can do more than 2.5MB and 5MB xfers per req
 245  * at 1byte/burst for P<->M and M<->M respectively.
 246  * For typical scenario, at 1word/burst, 10MB and 20MB xfers per req
 247  * should be enough for P<->M and M<->M respectively.
 248  */
 249 #define MCODE_BUFF_PER_REQ      256
 250
 251 /* Use this _only_ to wait on transient states */
 252 #define UNTIL(t, s)     while (!(_state(t) & (s))) cpu_relax();
 253
 254 #ifdef PL330_DEBUG_MCGEN
 255 static unsigned cmd_line;
 256 #define PL330_DBGCMD_DUMP(off, x...)    do { \
 257                                                 printk("%x:", cmd_line); \
 258                                                 printk(x); \
 259                                                 cmd_line += off; \
 260                                         } while (0)
 261 #define PL330_DBGMC_START(addr)         (cmd_line = addr)
 262 #else
 263 #define PL330_DBGCMD_DUMP(off, x...)    do {} while (0)
 264 #define PL330_DBGMC_START(addr)         do {} while (0)
 265 #endif
 266
 267 /* The number of default descriptors */
 268
 269 #define NR_DEFAULT_DESC 16
 270
 271 /* Delay for runtime PM autosuspend, ms */
 272 #define PL330_AUTOSUSPEND_DELAY 20
 273
 274 /* Populated by the PL330 core driver for DMA API driver's info */
 275 struct pl330_config {
 276         u32     periph_id;
 277 #define DMAC_MODE_NS    (1 << 0)
 278         unsigned int    mode;
 279         unsigned int    data_bus_width:10; /* In number of bits */
 280         unsigned int    data_buf_dep:11;
 281         unsigned int    num_chan:4;
 282         unsigned int    num_peri:6;
 283         u32             peri_ns;
 284         unsigned int    num_events:6;
 285         u32             irq_ns;
 286 };
 287
 288 /**
 289  * Request Configuration.
 290  * The PL330 core does not modify this and uses the last
 291  * working configuration if the request doesn't provide any.
 292  *
 293  * The Client may want to provide this info only for the
 294  * first request and a request with new settings.
 295  */
 296 struct pl330_reqcfg {
 297         /* Address Incrementing */
 298         unsigned dst_inc:1;
 299         unsigned src_inc:1;
 300
 301         /*
 302          * For now, the SRC & DST protection levels
 303          * and burst size/length are assumed same.
 304          */
 305         bool nonsecure;
 306         bool privileged;
 307         bool insnaccess;
 308         unsigned brst_len:5;
 309         unsigned brst_size:3; /* in power of 2 */
 310
 311         enum pl330_cachectrl dcctl;
 312         enum pl330_cachectrl scctl;
 313         enum pl330_byteswap swap;
 314         struct pl330_config *pcfg;
 315 };
 316
 317 /*
 318  * One cycle of DMAC operation.
 319  * There may be more than one xfer in a request.
 320  */
 321 struct pl330_xfer {
 322         u32 src_addr;
 323         u32 dst_addr;
 324         /* Size to xfer */
 325         u32 bytes;
 326 };
 327
 328 /* The xfer callbacks are made with one of these arguments. */
 329 enum pl330_op_err {
 330         /* The all xfers in the request were success. */
 331         PL330_ERR_NONE,
 332         /* If req aborted due to global error. */
 333         PL330_ERR_ABORT,
 334         /* If req failed due to problem with Channel. */
 335         PL330_ERR_FAIL,
 336 };
 337
 338 enum dmamov_dst {
 339         SAR = 0,
 340         CCR,
 341         DAR,
 342 };
 343
 344 enum pl330_dst {
 345         SRC = 0,
 346         DST,
 347 };
 348
 349 enum pl330_cond {
 350         SINGLE,
 351         BURST,
 352         ALWAYS,
 353 };
 354
 355 struct dma_pl330_desc;
 356
 357 struct _pl330_req {
 358         u32 mc_bus;
 359         void *mc_cpu;
 360         struct dma_pl330_desc *desc;
 361 };
 362
 363 /* ToBeDone for tasklet */
 364 struct _pl330_tbd {
 365         bool reset_dmac;
 366         bool reset_mngr;
 367         u8 reset_chan;
 368 };
 369
 370 /* A DMAC Thread */
 371 struct pl330_thread {
 372         u8 id;
 373         int ev;
 374         /* If the channel is not yet acquired by any client */
 375         bool free;
 376         /* Parent DMAC */
 377         struct pl330_dmac *dmac;
 378         /* Only two at a time */
 379         struct _pl330_req req[2];
 380         /* Index of the last enqueued request */
 381         unsigned lstenq;
 382         /* Index of the last submitted request or -1 if the DMA is stopped */
 383         int req_running;
 384 };
 385
 386 enum pl330_dmac_state {
 387         UNINIT,
 388         INIT,
 389         DYING,
 390 };
 391
 392 enum desc_status {
 393         /* In the DMAC pool */
 394         FREE,
 395         /*
 396          * Allocated to some channel during prep_xxx
 397          * Also may be sitting on the work_list.
 398          */
 399         PREP,
 400         /*
 401          * Sitting on the work_list and already submitted
 402          * to the PL330 core. Not more than two descriptors
 403          * of a channel can be BUSY at any time.
 404          */
 405         BUSY,
 406         /*
 407          * Sitting on the channel work_list but xfer done
 408          * by PL330 core
 409          */
 410         DONE,
 411 };
 412
 413 struct dma_pl330_chan {
 414         /* Schedule desc completion */
 415         struct tasklet_struct task;
 416
 417         /* DMA-Engine Channel */
 418         struct dma_chan chan;
 419
 420         /* List of submitted descriptors */
 421         struct list_head submitted_list;
 422         /* List of issued descriptors */
 423         struct list_head work_list;
 424         /* List of completed descriptors */
 425         struct list_head completed_list;
 426
 427         /* Pointer to the DMAC that manages this channel,
 428          * NULL if the channel is available to be acquired.
 429          * As the parent, this DMAC also provides descriptors
 430          * to the channel.
 431          */
 432         struct pl330_dmac *dmac;
 433
 434         /* To protect channel manipulation */
 435         spinlock_t lock;
 436
 437         /*
 438          * Hardware channel thread of PL330 DMAC. NULL if the channel is
 439          * available.
 440          */
 441         struct pl330_thread *thread;
 442
 443         /* For D-to-M and M-to-D channels */
 444         int burst_sz; /* the peripheral fifo width */
 445         int burst_len; /* the number of burst */
 446         phys_addr_t fifo_addr;
 447         /* DMA-mapped view of the FIFO; may differ if an IOMMU is present */
 448         dma_addr_t fifo_dma;
 449         enum dma_data_direction dir;
 450
 451         /* for cyclic capability */
 452         bool cyclic;
 453
 454         /* for runtime pm tracking */
 455         bool active;
 456 };
 457
 458 struct pl330_dmac {
 459         /* DMA-Engine Device */
 460         struct dma_device ddma;
 461
 462         /* Holds info about sg limitations */
 463         struct device_dma_parameters dma_parms;
 464
 465         /* Pool of descriptors available for the DMAC's channels */
 466         struct list_head desc_pool;
 467         /* To protect desc_pool manipulation */
 468         spinlock_t pool_lock;
 469
 470         /* Size of MicroCode buffers for each channel. */
 471         unsigned mcbufsz;
 472         /* ioremap'ed address of PL330 registers. */
 473         void __iomem    *base;
 474         /* Populated by the PL330 core driver during pl330_add */
 475         struct pl330_config     pcfg;
 476
 477         spinlock_t              lock;
 478         /* Maximum possible events/irqs */
 479         int                     events[32];
 480         /* BUS address of MicroCode buffer */
 481         dma_addr_t              mcode_bus;
 482         /* CPU address of MicroCode buffer */
 483         void                    *mcode_cpu;
 484         /* List of all Channel threads */
 485         struct pl330_thread     *channels;
 486         /* Pointer to the MANAGER thread */
 487         struct pl330_thread     *manager;
 488         /* To handle bad news in interrupt */
 489         struct tasklet_struct   tasks;
 490         struct _pl330_tbd       dmac_tbd;
 491         /* State of DMAC operation */
 492         enum pl330_dmac_state   state;
 493         /* Holds list of reqs with due callbacks */
 494         struct list_head        req_done;
 495
 496         /* Peripheral channels connected to this DMAC */
 497         unsigned int num_peripherals;
 498         struct dma_pl330_chan *peripherals; /* keep at end */
 499         int quirks;
 500 };
 501
 502 static struct pl330_of_quirks {
 503         char *quirk;
 504         int id;
 505 } of_quirks[] = {
 506         {
 507                 .quirk = "arm,pl330-broken-no-flushp",
 508                 .id = PL330_QUIRK_BROKEN_NO_FLUSHP,
 509         }
 510 };
 511
 512 struct dma_pl330_desc {
 513         /* To attach to a queue as child */
 514         struct list_head node;
 515
 516         /* Descriptor for the DMA Engine API */
 517         struct dma_async_tx_descriptor txd;
 518
 519         /* Xfer for PL330 core */
 520         struct pl330_xfer px;
 521
 522         struct pl330_reqcfg rqcfg;
 523
 524         enum desc_status status;
 525
 526         int bytes_requested;
 527         bool last;
 528
 529         /* The channel which currently holds this desc */
 530         struct dma_pl330_chan *pchan;
 531
 532         enum dma_transfer_direction rqtype;
 533         /* Index of peripheral for the xfer. */
 534         unsigned peri:5;
 535         /* Hook to attach to DMAC's list of reqs with due callback */
 536         struct list_head rqd;
 537 };
 538
 539 struct _xfer_spec {
 540         u32 ccr;
 541         struct dma_pl330_desc *desc;
 542 };
 543
 544 static inline bool _queue_full(struct pl330_thread *thrd)
 545 {
 546         return thrd->req[0].desc != NULL && thrd->req[1].desc != NULL;
 547 }
 548
 549 static inline bool is_manager(struct pl330_thread *thrd)
 550 {
 551         return thrd->dmac->manager == thrd;
 552 }
 553
 554 /* If manager of the thread is in Non-Secure mode */
 555 static inline bool _manager_ns(struct pl330_thread *thrd)
 556 {
 557         return (thrd->dmac->pcfg.mode & DMAC_MODE_NS) ? true : false;
 558 }
 559
 560 static inline u32 get_revision(u32 periph_id)
 561 {
 562         return (periph_id >> PERIPH_REV_SHIFT) & PERIPH_REV_MASK;
 563 }
 564
 565 static inline u32 _emit_END(unsigned dry_run, u8 buf[])
 566 {
 567         if (dry_run)
 568                 return SZ_DMAEND;
 569
 570         buf[0] = CMD_DMAEND;
 571
 572         PL330_DBGCMD_DUMP(SZ_DMAEND, "\tDMAEND\n");
 573
 574         return SZ_DMAEND;
 575 }
 576
 577 static inline u32 _emit_FLUSHP(unsigned dry_run, u8 buf[], u8 peri)
 578 {
 579         if (dry_run)
 580                 return SZ_DMAFLUSHP;
 581
 582         buf[0] = CMD_DMAFLUSHP;
 583
 584         peri &= 0x1f;
 585         peri <<= 3;
 586         buf[1] = peri;
 587
 588         PL330_DBGCMD_DUMP(SZ_DMAFLUSHP, "\tDMAFLUSHP %u\n", peri >> 3);
 589
 590         return SZ_DMAFLUSHP;
 591 }
 592
 593 static inline u32 _emit_LD(unsigned dry_run, u8 buf[],  enum pl330_cond cond)
 594 {
 595         if (dry_run)
 596                 return SZ_DMALD;
 597
 598         buf[0] = CMD_DMALD;
 599
 600         if (cond == SINGLE)
 601                 buf[0] |= (0 << 1) | (1 << 0);
 602         else if (cond == BURST)
 603                 buf[0] |= (1 << 1) | (1 << 0);
 604
 605         PL330_DBGCMD_DUMP(SZ_DMALD, "\tDMALD%c\n",
 606                 cond == SINGLE ? 'S' : (cond == BURST ? 'B' : 'A'));
 607
 608         return SZ_DMALD;
 609 }
 610
 611 static inline u32 _emit_LDP(unsigned dry_run, u8 buf[],
 612                 enum pl330_cond cond, u8 peri)
 613 {
 614         if (dry_run)
 615                 return SZ_DMALDP;
 616
 617         buf[0] = CMD_DMALDP;
 618
 619         if (cond == BURST)
 620                 buf[0] |= (1 << 1);
 621
 622         peri &= 0x1f;
 623         peri <<= 3;
 624         buf[1] = peri;
 625
 626         PL330_DBGCMD_DUMP(SZ_DMALDP, "\tDMALDP%c %u\n",
 627                 cond == SINGLE ? 'S' : 'B', peri >> 3);
 628
 629         return SZ_DMALDP;
 630 }
 631
 632 static inline u32 _emit_LP(unsigned dry_run, u8 buf[],
 633                 unsigned loop, u8 cnt)
 634 {
 635         if (dry_run)
 636                 return SZ_DMALP;
 637
 638         buf[0] = CMD_DMALP;
 639
 640         if (loop)
 641                 buf[0] |= (1 << 1);
 642
 643         cnt--; /* DMAC increments by 1 internally */
 644         buf[1] = cnt;
 645
 646         PL330_DBGCMD_DUMP(SZ_DMALP, "\tDMALP_%c %u\n", loop ? '1' : '0', cnt);
 647
 648         return SZ_DMALP;
 649 }
 650
 651 struct _arg_LPEND {
 652         enum pl330_cond cond;
 653         bool forever;
 654         unsigned loop;
 655         u8 bjump;
 656 };
 657
 658 static inline u32 _emit_LPEND(unsigned dry_run, u8 buf[],
 659                 const struct _arg_LPEND *arg)
 660 {
 661         enum pl330_cond cond = arg->cond;
 662         bool forever = arg->forever;
 663         unsigned loop = arg->loop;
 664         u8 bjump = arg->bjump;
 665
 666         if (dry_run)
 667                 return SZ_DMALPEND;
 668
 669         buf[0] = CMD_DMALPEND;
 670
 671         if (loop)
 672                 buf[0] |= (1 << 2);
 673
 674         if (!forever)
 675                 buf[0] |= (1 << 4);
 676
 677         if (cond == SINGLE)
 678                 buf[0] |= (0 << 1) | (1 << 0);
 679         else if (cond == BURST)
 680                 buf[0] |= (1 << 1) | (1 << 0);
 681
 682         buf[1] = bjump;
 683
 684         PL330_DBGCMD_DUMP(SZ_DMALPEND, "\tDMALP%s%c_%c bjmpto_%x\n",
 685                         forever ? "FE" : "END",
 686                         cond == SINGLE ? 'S' : (cond == BURST ? 'B' : 'A'),
 687                         loop ? '1' : '0',
 688                         bjump);
 689
 690         return SZ_DMALPEND;
 691 }
 692
 693 static inline u32 _emit_KILL(unsigned dry_run, u8 buf[])
 694 {
 695         if (dry_run)
 696                 return SZ_DMAKILL;
 697
 698         buf[0] = CMD_DMAKILL;
 699
 700         return SZ_DMAKILL;
 701 }
 702
 703 static inline u32 _emit_MOV(unsigned dry_run, u8 buf[],
 704                 enum dmamov_dst dst, u32 val)
 705 {
 706         if (dry_run)
 707                 return SZ_DMAMOV;
 708
 709         buf[0] = CMD_DMAMOV;
 710         buf[1] = dst;
 711         buf[2] = val;
 712         buf[3] = val >> 8;
 713         buf[4] = val >> 16;
 714         buf[5] = val >> 24;
 715
 716         PL330_DBGCMD_DUMP(SZ_DMAMOV, "\tDMAMOV %s 0x%x\n",
 717                 dst == SAR ? "SAR" : (dst == DAR ? "DAR" : "CCR"), val);
 718
 719         return SZ_DMAMOV;
 720 }
 721
 722 static inline u32 _emit_RMB(unsigned dry_run, u8 buf[])
 723 {
 724         if (dry_run)
 725                 return SZ_DMARMB;
 726
 727         buf[0] = CMD_DMARMB;
 728
 729         PL330_DBGCMD_DUMP(SZ_DMARMB, "\tDMARMB\n");
 730
 731         return SZ_DMARMB;
 732 }
 733
 734 static inline u32 _emit_SEV(unsigned dry_run, u8 buf[], u8 ev)
 735 {
 736         if (dry_run)
 737                 return SZ_DMASEV;
 738
 739         buf[0] = CMD_DMASEV;
 740
 741         ev &= 0x1f;
 742         ev <<= 3;
 743         buf[1] = ev;
 744
 745         PL330_DBGCMD_DUMP(SZ_DMASEV, "\tDMASEV %u\n", ev >> 3);
 746
 747         return SZ_DMASEV;
 748 }
 749
 750 static inline u32 _emit_ST(unsigned dry_run, u8 buf[], enum pl330_cond cond)
 751 {
 752         if (dry_run)
 753                 return SZ_DMAST;
 754
 755         buf[0] = CMD_DMAST;
 756
 757         if (cond == SINGLE)
 758                 buf[0] |= (0 << 1) | (1 << 0);
 759         else if (cond == BURST)
 760                 buf[0] |= (1 << 1) | (1 << 0);
 761
 762         PL330_DBGCMD_DUMP(SZ_DMAST, "\tDMAST%c\n",
 763                 cond == SINGLE ? 'S' : (cond == BURST ? 'B' : 'A'));
 764
 765         return SZ_DMAST;
 766 }
 767
 768 static inline u32 _emit_STP(unsigned dry_run, u8 buf[],
 769                 enum pl330_cond cond, u8 peri)
 770 {
 771         if (dry_run)
 772                 return SZ_DMASTP;
 773
 774         buf[0] = CMD_DMASTP;
 775
 776         if (cond == BURST)
 777                 buf[0] |= (1 << 1);
 778
 779         peri &= 0x1f;
 780         peri <<= 3;
 781         buf[1] = peri;
 782
 783         PL330_DBGCMD_DUMP(SZ_DMASTP, "\tDMASTP%c %u\n",
 784                 cond == SINGLE ? 'S' : 'B', peri >> 3);
 785
 786         return SZ_DMASTP;
 787 }
 788
 789 static inline u32 _emit_WFP(unsigned dry_run, u8 buf[],
 790                 enum pl330_cond cond, u8 peri)
 791 {
 792         if (dry_run)
 793                 return SZ_DMAWFP;
 794
 795         buf[0] = CMD_DMAWFP;
 796
 797         if (cond == SINGLE)
 798                 buf[0] |= (0 << 1) | (0 << 0);
 799         else if (cond == BURST)
 800                 buf[0] |= (1 << 1) | (0 << 0);
 801         else
 802                 buf[0] |= (0 << 1) | (1 << 0);
 803
 804         peri &= 0x1f;
 805         peri <<= 3;
 806         buf[1] = peri;
 807
 808         PL330_DBGCMD_DUMP(SZ_DMAWFP, "\tDMAWFP%c %u\n",
 809                 cond == SINGLE ? 'S' : (cond == BURST ? 'B' : 'P'), peri >> 3);
 810
 811         return SZ_DMAWFP;
 812 }
 813
 814 static inline u32 _emit_WMB(unsigned dry_run, u8 buf[])
 815 {
 816         if (dry_run)
 817                 return SZ_DMAWMB;
 818
 819         buf[0] = CMD_DMAWMB;
 820
 821         PL330_DBGCMD_DUMP(SZ_DMAWMB, "\tDMAWMB\n");
 822
 823         return SZ_DMAWMB;
 824 }
 825
 826 struct _arg_GO {
 827         u8 chan;
 828         u32 addr;
 829         unsigned ns;
 830 };
 831
 832 static inline u32 _emit_GO(unsigned dry_run, u8 buf[],
 833                 const struct _arg_GO *arg)
 834 {
 835         u8 chan = arg->chan;
 836         u32 addr = arg->addr;
 837         unsigned ns = arg->ns;
 838
 839         if (dry_run)
 840                 return SZ_DMAGO;
 841
 842         buf[0] = CMD_DMAGO;
 843         buf[0] |= (ns << 1);
 844         buf[1] = chan & 0x7;
 845         buf[2] = addr;
 846         buf[3] = addr >> 8;
 847         buf[4] = addr >> 16;
 848         buf[5] = addr >> 24;
 849
 850         return SZ_DMAGO;
 851 }
 852
 853 #define msecs_to_loops(t) (loops_per_jiffy / 1000 * HZ * t)
 854
 855 /* Returns Time-Out */
 856 static bool _until_dmac_idle(struct pl330_thread *thrd)
 857 {
 858         void __iomem *regs = thrd->dmac->base;
 859         unsigned long loops = msecs_to_loops(5);
 860
 861         do {
 862                 /* Until Manager is Idle */
 863                 if (!(readl(regs + DBGSTATUS) & DBG_BUSY))
 864                         break;
 865
 866                 cpu_relax();
 867         } while (--loops);
 868
 869         if (!loops)
 870                 return true;
 871
 872         return false;
 873 }
 874
 875 static inline void _execute_DBGINSN(struct pl330_thread *thrd,
 876                 u8 insn[], bool as_manager)
 877 {
 878         void __iomem *regs = thrd->dmac->base;
 879         u32 val;
 880
 881         val = (insn[0] << 16) | (insn[1] << 24);
 882         if (!as_manager) {
 883                 val |= (1 << 0);
 884                 val |= (thrd->id << 8); /* Channel Number */
 885         }
 886         writel(val, regs + DBGINST0);
 887
 888         val = le32_to_cpu(*((__le32 *)&insn[2]));
 889         writel(val, regs + DBGINST1);
 890
 891         /* If timed out due to halted state-machine */
 892         if (_until_dmac_idle(thrd)) {
 893                 dev_err(thrd->dmac->ddma.dev, "DMAC halted!\n");
 894                 return;
 895         }
 896
 897         /* Get going */
 898         writel(0, regs + DBGCMD);
 899 }
 900
 901 static inline u32 _state(struct pl330_thread *thrd)
 902 {
 903         void __iomem *regs = thrd->dmac->base;
 904         u32 val;
 905
 906         if (is_manager(thrd))
 907                 val = readl(regs + DS) & 0xf;
 908         else
 909                 val = readl(regs + CS(thrd->id)) & 0xf;
 910
 911         switch (val) {
 912         case DS_ST_STOP:
 913                 return PL330_STATE_STOPPED;
 914         case DS_ST_EXEC:
 915                 return PL330_STATE_EXECUTING;
 916         case DS_ST_CMISS:
 917                 return PL330_STATE_CACHEMISS;
 918         case DS_ST_UPDTPC:
 919                 return PL330_STATE_UPDTPC;
 920         case DS_ST_WFE:
 921                 return PL330_STATE_WFE;
 922         case DS_ST_FAULT:
 923                 return PL330_STATE_FAULTING;
 924         case DS_ST_ATBRR:
 925                 if (is_manager(thrd))
 926                         return PL330_STATE_INVALID;
 927                 else
 928                         return PL330_STATE_ATBARRIER;
 929         case DS_ST_QBUSY:
 930                 if (is_manager(thrd))
 931                         return PL330_STATE_INVALID;
 932                 else
 933                         return PL330_STATE_QUEUEBUSY;
 934         case DS_ST_WFP:
 935                 if (is_manager(thrd))
 936                         return PL330_STATE_INVALID;
 937                 else
 938                         return PL330_STATE_WFP;
 939         case DS_ST_KILL:
 940                 if (is_manager(thrd))
 941                         return PL330_STATE_INVALID;
 942                 else
 943                         return PL330_STATE_KILLING;
 944         case DS_ST_CMPLT:
 945                 if (is_manager(thrd))
 946                         return PL330_STATE_INVALID;
 947                 else
 948                         return PL330_STATE_COMPLETING;
 949         case DS_ST_FLTCMP:
 950                 if (is_manager(thrd))
 951                         return PL330_STATE_INVALID;
 952                 else
 953                         return PL330_STATE_FAULT_COMPLETING;
 954         default:
 955                 return PL330_STATE_INVALID;
 956         }
 957 }
 958
 959 static void _stop(struct pl330_thread *thrd)
 960 {
 961         void __iomem *regs = thrd->dmac->base;
 962         u8 insn[6] = {0, 0, 0, 0, 0, 0};
 963
 964         if (_state(thrd) == PL330_STATE_FAULT_COMPLETING)
 965                 UNTIL(thrd, PL330_STATE_FAULTING | PL330_STATE_KILLING);
 966
 967         /* Return if nothing needs to be done */
 968         if (_state(thrd) == PL330_STATE_COMPLETING
 969                   || _state(thrd) == PL330_STATE_KILLING
 970                   || _state(thrd) == PL330_STATE_STOPPED)
 971                 return;
 972
 973         _emit_KILL(0, insn);
 974
 975         /* Stop generating interrupts for SEV */
 976         writel(readl(regs + INTEN) & ~(1 << thrd->ev), regs + INTEN);
 977
 978         _execute_DBGINSN(thrd, insn, is_manager(thrd));
 979 }
 980
 981 /* Start doing req 'idx' of thread 'thrd' */
 982 static bool _trigger(struct pl330_thread *thrd)
 983 {
 984         void __iomem *regs = thrd->dmac->base;
 985         struct _pl330_req *req;
 986         struct dma_pl330_desc *desc;
 987         struct _arg_GO go;
 988         unsigned ns;
 989         u8 insn[6] = {0, 0, 0, 0, 0, 0};
 990         int idx;
 991
 992         /* Return if already ACTIVE */
 993         if (_state(thrd) != PL330_STATE_STOPPED)
 994                 return true;
 995
 996         idx = 1 - thrd->lstenq;
 997         if (thrd->req[idx].desc != NULL) {
 998                 req = &thrd->req[idx];
 999         } else {
1000                 idx = thrd->lstenq;
1001                 if (thrd->req[idx].desc != NULL)
1002                         req = &thrd->req[idx];
1003                 else
1004                         req = NULL;
1005         }
1006
1007         /* Return if no request */
1008         if (!req)
1009                 return true;
1010
1011         /* Return if req is running */
1012         if (idx == thrd->req_running)
1013                 return true;
1014
1015         desc = req->desc;
1016
1017         ns = desc->rqcfg.nonsecure ? 1 : 0;
1018
1019         /* See 'Abort Sources' point-4 at Page 2-25 */
1020         if (_manager_ns(thrd) && !ns)
1021                 dev_info(thrd->dmac->ddma.dev, "%s:%d Recipe for ABORT!\n",
1022                         __func__, __LINE__);
1023
1024         go.chan = thrd->id;
1025         go.addr = req->mc_bus;
1026         go.ns = ns;
1027         _emit_GO(0, insn, &go);
1028
1029         /* Set to generate interrupts for SEV */
1030         writel(readl(regs + INTEN) | (1 << thrd->ev), regs + INTEN);
1031
1032         /* Only manager can execute GO */
1033         _execute_DBGINSN(thrd, insn, true);
1034
1035         thrd->req_running = idx;
1036
1037         return true;
1038 }
1039
1040 static bool _start(struct pl330_thread *thrd)
1041 {
1042         switch (_state(thrd)) {
1043         case PL330_STATE_FAULT_COMPLETING:
1044                 UNTIL(thrd, PL330_STATE_FAULTING | PL330_STATE_KILLING);
1045
1046                 if (_state(thrd) == PL330_STATE_KILLING)
1047                         UNTIL(thrd, PL330_STATE_STOPPED)
1048
1049         case PL330_STATE_FAULTING:
1050                 _stop(thrd);
1051
1052         case PL330_STATE_KILLING:
1053         case PL330_STATE_COMPLETING:
1054                 UNTIL(thrd, PL330_STATE_STOPPED)
1055
1056         case PL330_STATE_STOPPED:
1057                 return _trigger(thrd);
1058
1059         case PL330_STATE_WFP:
1060         case PL330_STATE_QUEUEBUSY:
1061         case PL330_STATE_ATBARRIER:
1062         case PL330_STATE_UPDTPC:
1063         case PL330_STATE_CACHEMISS:
1064         case PL330_STATE_EXECUTING:
1065                 return true;
1066
1067         case PL330_STATE_WFE: /* For RESUME, nothing yet */
1068         default:
1069                 return false;
1070         }
1071 }
1072
1073 static inline int _ldst_memtomem(unsigned dry_run, u8 buf[],
1074                 const struct _xfer_spec *pxs, int cyc)
1075 {
1076         int off = 0;
1077         struct pl330_config *pcfg = pxs->desc->rqcfg.pcfg;
1078
1079         /* check lock-up free version */
1080         if (get_revision(pcfg->periph_id) >= PERIPH_REV_R1P0) {
1081                 while (cyc--) {
1082                         off += _emit_LD(dry_run, &buf[off], ALWAYS);
1083                         off += _emit_ST(dry_run, &buf[off], ALWAYS);
1084                 }
1085         } else {
1086                 while (cyc--) {
1087                         off += _emit_LD(dry_run, &buf[off], ALWAYS);
1088                         off += _emit_RMB(dry_run, &buf[off]);
1089                         off += _emit_ST(dry_run, &buf[off], ALWAYS);
1090                         off += _emit_WMB(dry_run, &buf[off]);
1091                 }
1092         }
1093
1094         return off;
1095 }
1096
1097 static inline int _ldst_devtomem(struct pl330_dmac *pl330, unsigned dry_run,
1098                                  u8 buf[], const struct _xfer_spec *pxs,
1099                                  int cyc)
1100 {
1101         int off = 0;
1102         enum pl330_cond cond;
1103
1104         if (pl330->quirks & PL330_QUIRK_BROKEN_NO_FLUSHP)
1105                 cond = BURST;
1106         else
1107                 cond = SINGLE;
1108
1109         while (cyc--) {
1110                 off += _emit_WFP(dry_run, &buf[off], cond, pxs->desc->peri);
1111                 off += _emit_LDP(dry_run, &buf[off], cond, pxs->desc->peri);
1112                 off += _emit_ST(dry_run, &buf[off], ALWAYS);
1113
1114                 if (!(pl330->quirks & PL330_QUIRK_BROKEN_NO_FLUSHP))
1115                         off += _emit_FLUSHP(dry_run, &buf[off],
1116                                             pxs->desc->peri);
1117         }
1118
1119         return off;
1120 }
1121
1122 static inline int _ldst_memtodev(struct pl330_dmac *pl330,
1123                                  unsigned dry_run, u8 buf[],
1124                                  const struct _xfer_spec *pxs, int cyc)
1125 {
1126         int off = 0;
1127         enum pl330_cond cond;
1128
1129         if (pl330->quirks & PL330_QUIRK_BROKEN_NO_FLUSHP)
1130                 cond = BURST;
1131         else
1132                 cond = SINGLE;
1133
1134         while (cyc--) {
1135                 off += _emit_WFP(dry_run, &buf[off], cond, pxs->desc->peri);
1136                 off += _emit_LD(dry_run, &buf[off], ALWAYS);
1137                 off += _emit_STP(dry_run, &buf[off], cond, pxs->desc->peri);
1138
1139                 if (!(pl330->quirks & PL330_QUIRK_BROKEN_NO_FLUSHP))
1140                         off += _emit_FLUSHP(dry_run, &buf[off],
1141                                             pxs->desc->peri);
1142         }
1143
1144         return off;
1145 }
1146
1147 static int _bursts(struct pl330_dmac *pl330, unsigned dry_run, u8 buf[],
1148                 const struct _xfer_spec *pxs, int cyc)
1149 {
1150         int off = 0;
1151
1152         switch (pxs->desc->rqtype) {
1153         case DMA_MEM_TO_DEV:
1154                 off += _ldst_memtodev(pl330, dry_run, &buf[off], pxs, cyc);
1155                 break;
1156         case DMA_DEV_TO_MEM:
1157                 off += _ldst_devtomem(pl330, dry_run, &buf[off], pxs, cyc);
1158                 break;
1159         case DMA_MEM_TO_MEM:
1160                 off += _ldst_memtomem(dry_run, &buf[off], pxs, cyc);
1161                 break;
1162         default:
1163                 off += 0x40000000; /* Scare off the Client */
1164                 break;
1165         }
1166
1167         return off;
1168 }
1169
1170 /* Returns bytes consumed and updates bursts */
1171 static inline int _loop(struct pl330_dmac *pl330, unsigned dry_run, u8 buf[],
1172                 unsigned long *bursts, const struct _xfer_spec *pxs)
1173 {
1174         int cyc, cycmax, szlp, szlpend, szbrst, off;
1175         unsigned lcnt0, lcnt1, ljmp0, ljmp1;
1176         struct _arg_LPEND lpend;
1177
1178         if (*bursts == 1)
1179                 return _bursts(pl330, dry_run, buf, pxs, 1);
1180
1181         /* Max iterations possible in DMALP is 256 */
1182         if (*bursts >= 256*256) {
1183                 lcnt1 = 256;
1184                 lcnt0 = 256;
1185                 cyc = *bursts / lcnt1 / lcnt0;
1186         } else if (*bursts > 256) {
1187                 lcnt1 = 256;
1188                 lcnt0 = *bursts / lcnt1;
1189                 cyc = 1;
1190         } else {
1191                 lcnt1 = *bursts;
1192                 lcnt0 = 0;
1193                 cyc = 1;
1194         }
1195
1196         szlp = _emit_LP(1, buf, 0, 0);
1197         szbrst = _bursts(pl330, 1, buf, pxs, 1);
1198
1199         lpend.cond = ALWAYS;
1200         lpend.forever = false;
1201         lpend.loop = 0;
1202         lpend.bjump = 0;
1203         szlpend = _emit_LPEND(1, buf, &lpend);
1204
1205         if (lcnt0) {
1206                 szlp *= 2;
1207                 szlpend *= 2;
1208         }
1209
1210         /*
1211          * Max bursts that we can unroll due to limit on the
1212          * size of backward jump that can be encoded in DMALPEND
1213          * which is 8-bits and hence 255
1214          */
1215         cycmax = (255 - (szlp + szlpend)) / szbrst;
1216
1217         cyc = (cycmax < cyc) ? cycmax : cyc;
1218
1219         off = 0;
1220
1221         if (lcnt0) {
1222                 off += _emit_LP(dry_run, &buf[off], 0, lcnt0);
1223                 ljmp0 = off;
1224         }
1225
1226         off += _emit_LP(dry_run, &buf[off], 1, lcnt1);
1227         ljmp1 = off;
1228
1229         off += _bursts(pl330, dry_run, &buf[off], pxs, cyc);
1230
1231         lpend.cond = ALWAYS;
1232         lpend.forever = false;
1233         lpend.loop = 1;
1234         lpend.bjump = off - ljmp1;
1235         off += _emit_LPEND(dry_run, &buf[off], &lpend);
1236
1237         if (lcnt0) {
1238                 lpend.cond = ALWAYS;
1239                 lpend.forever = false;
1240                 lpend.loop = 0;
1241                 lpend.bjump = off - ljmp0;
1242                 off += _emit_LPEND(dry_run, &buf[off], &lpend);
1243         }
1244
1245         *bursts = lcnt1 * cyc;
1246         if (lcnt0)
1247                 *bursts *= lcnt0;
1248
1249         return off;
1250 }
1251
1252 static inline int _setup_loops(struct pl330_dmac *pl330,
1253                                unsigned dry_run, u8 buf[],
1254                                const struct _xfer_spec *pxs)
1255 {
1256         struct pl330_xfer *x = &pxs->desc->px;
1257         u32 ccr = pxs->ccr;
1258         unsigned long c, bursts = BYTE_TO_BURST(x->bytes, ccr);
1259         int off = 0;
1260
1261         while (bursts) {
1262                 c = bursts;
1263                 off += _loop(pl330, dry_run, &buf[off], &c, pxs);
1264                 bursts -= c;
1265         }
1266
1267         return off;
1268 }
1269
1270 static inline int _setup_xfer(struct pl330_dmac *pl330,
1271                               unsigned dry_run, u8 buf[],
1272                               const struct _xfer_spec *pxs)
1273 {
1274         struct pl330_xfer *x = &pxs->desc->px;
1275         int off = 0;
1276
1277         /* DMAMOV SAR, x->src_addr */
1278         off += _emit_MOV(dry_run, &buf[off], SAR, x->src_addr);
1279         /* DMAMOV DAR, x->dst_addr */
1280         off += _emit_MOV(dry_run, &buf[off], DAR, x->dst_addr);
1281
1282         /* Setup Loop(s) */
1283         off += _setup_loops(pl330, dry_run, &buf[off], pxs);
1284
1285         return off;
1286 }
1287
1288 /*
1289  * A req is a sequence of one or more xfer units.
1290  * Returns the number of bytes taken to setup the MC for the req.
1291  */
1292 static int _setup_req(struct pl330_dmac *pl330, unsigned dry_run,
1293                       struct pl330_thread *thrd, unsigned index,
1294                       struct _xfer_spec *pxs)
1295 {
1296         struct _pl330_req *req = &thrd->req[index];
1297         struct pl330_xfer *x;
1298         u8 *buf = req->mc_cpu;
1299         int off = 0;
1300
1301         PL330_DBGMC_START(req->mc_bus);
1302
1303         /* DMAMOV CCR, ccr */
1304         off += _emit_MOV(dry_run, &buf[off], CCR, pxs->ccr);
1305
1306         x = &pxs->desc->px;
1307         /* Error if xfer length is not aligned at burst size */
1308         if (x->bytes % (BRST_SIZE(pxs->ccr) * BRST_LEN(pxs->ccr)))
1309                 return -EINVAL;
1310
1311         off += _setup_xfer(pl330, dry_run, &buf[off], pxs);
1312
1313         /* DMASEV peripheral/event */
1314         off += _emit_SEV(dry_run, &buf[off], thrd->ev);
1315         /* DMAEND */
1316         off += _emit_END(dry_run, &buf[off]);
1317
1318         return off;
1319 }
1320
1321 static inline u32 _prepare_ccr(const struct pl330_reqcfg *rqc)
1322 {
1323         u32 ccr = 0;
1324
1325         if (rqc->src_inc)
1326                 ccr |= CC_SRCINC;
1327
1328         if (rqc->dst_inc)
1329                 ccr |= CC_DSTINC;
1330
1331         /* We set same protection levels for Src and DST for now */
1332         if (rqc->privileged)
1333                 ccr |= CC_SRCPRI | CC_DSTPRI;
1334         if (rqc->nonsecure)
1335                 ccr |= CC_SRCNS | CC_DSTNS;
1336         if (rqc->insnaccess)
1337                 ccr |= CC_SRCIA | CC_DSTIA;
1338
1339         ccr |= (((rqc->brst_len - 1) & 0xf) << CC_SRCBRSTLEN_SHFT);
1340         ccr |= (((rqc->brst_len - 1) & 0xf) << CC_DSTBRSTLEN_SHFT);
1341
1342         ccr |= (rqc->brst_size << CC_SRCBRSTSIZE_SHFT);
1343         ccr |= (rqc->brst_size << CC_DSTBRSTSIZE_SHFT);
1344
1345         ccr |= (rqc->scctl << CC_SRCCCTRL_SHFT);
1346         ccr |= (rqc->dcctl << CC_DSTCCTRL_SHFT);
1347
1348         ccr |= (rqc->swap << CC_SWAP_SHFT);
1349
1350         return ccr;
1351 }
1352
1353 /*
1354  * Submit a list of xfers after which the client wants notification.
1355  * Client is not notified after each xfer unit, just once after all
1356  * xfer units are done or some error occurs.
1357  */
1358 static int pl330_submit_req(struct pl330_thread *thrd,
1359         struct dma_pl330_desc *desc)
1360 {
1361         struct pl330_dmac *pl330 = thrd->dmac;
1362         struct _xfer_spec xs;
1363         unsigned long flags;
1364         unsigned idx;
1365         u32 ccr;
1366         int ret = 0;
1367
1368         if (pl330->state == DYING
1369                 || pl330->dmac_tbd.reset_chan & (1 << thrd->id)) {
1370                 dev_info(thrd->dmac->ddma.dev, "%s:%d\n",
1371                         __func__, __LINE__);
1372                 return -EAGAIN;
1373         }
1374
1375         /* If request for non-existing peripheral */
1376         if (desc->rqtype != DMA_MEM_TO_MEM &&
1377             desc->peri >= pl330->pcfg.num_peri) {
1378                 dev_info(thrd->dmac->ddma.dev,
1379                                 "%s:%d Invalid peripheral(%u)!\n",
1380                                 __func__, __LINE__, desc->peri);
1381                 return -EINVAL;
1382         }
1383
1384         spin_lock_irqsave(&pl330->lock, flags);
1385
1386         if (_queue_full(thrd)) {
1387                 ret = -EAGAIN;
1388                 goto xfer_exit;
1389         }
1390
1391         /* Prefer Secure Channel */
1392         if (!_manager_ns(thrd))
1393                 desc->rqcfg.nonsecure = 0;
1394         else
1395                 desc->rqcfg.nonsecure = 1;
1396
1397         ccr = _prepare_ccr(&desc->rqcfg);
1398
1399         idx = thrd->req[0].desc == NULL ? 0 : 1;
1400
1401         xs.ccr = ccr;
1402         xs.desc = desc;
1403
1404         /* First dry run to check if req is acceptable */
1405         ret = _setup_req(pl330, 1, thrd, idx, &xs);
1406         if (ret < 0)
1407                 goto xfer_exit;
1408
1409         if (ret > pl330->mcbufsz / 2) {
1410                 dev_info(pl330->ddma.dev, "%s:%d Try increasing mcbufsz (%i/%i)\n",
1411                                 __func__, __LINE__, ret, pl330->mcbufsz / 2);
1412                 ret = -ENOMEM;
1413                 goto xfer_exit;
1414         }
1415
1416         /* Hook the request */
1417         thrd->lstenq = idx;
1418         thrd->req[idx].desc = desc;
1419         _setup_req(pl330, 0, thrd, idx, &xs);
1420
1421         ret = 0;
1422
1423 xfer_exit:
1424         spin_unlock_irqrestore(&pl330->lock, flags);
1425
1426         return ret;
1427 }
1428
1429 static void dma_pl330_rqcb(struct dma_pl330_desc *desc, enum pl330_op_err err)
1430 {
1431         struct dma_pl330_chan *pch;
1432         unsigned long flags;
1433
1434         if (!desc)
1435                 return;
1436
1437         pch = desc->pchan;
1438
1439         /* If desc aborted */
1440         if (!pch)
1441                 return;
1442
1443         spin_lock_irqsave(&pch->lock, flags);
1444
1445         desc->status = DONE;
1446
1447         spin_unlock_irqrestore(&pch->lock, flags);
1448
1449         tasklet_schedule(&pch->task);
1450 }
1451
1452 static void pl330_dotask(unsigned long data)
1453 {
1454         struct pl330_dmac *pl330 = (struct pl330_dmac *) data;
1455         unsigned long flags;
1456         int i;
1457
1458         spin_lock_irqsave(&pl330->lock, flags);
1459
1460         /* The DMAC itself gone nuts */
1461         if (pl330->dmac_tbd.reset_dmac) {
1462                 pl330->state = DYING;
1463                 /* Reset the manager too */
1464                 pl330->dmac_tbd.reset_mngr = true;
1465                 /* Clear the reset flag */
1466                 pl330->dmac_tbd.reset_dmac = false;
1467         }
1468
1469         if (pl330->dmac_tbd.reset_mngr) {
1470                 _stop(pl330->manager);
1471                 /* Reset all channels */
1472                 pl330->dmac_tbd.reset_chan = (1 << pl330->pcfg.num_chan) - 1;
1473                 /* Clear the reset flag */
1474                 pl330->dmac_tbd.reset_mngr = false;
1475         }
1476
1477         for (i = 0; i < pl330->pcfg.num_chan; i++) {
1478
1479                 if (pl330->dmac_tbd.reset_chan & (1 << i)) {
1480                         struct pl330_thread *thrd = &pl330->channels[i];
1481                         void __iomem *regs = pl330->base;
1482                         enum pl330_op_err err;
1483
1484                         _stop(thrd);
1485
1486                         if (readl(regs + FSC) & (1 << thrd->id))
1487                                 err = PL330_ERR_FAIL;
1488                         else
1489                                 err = PL330_ERR_ABORT;
1490
1491                         spin_unlock_irqrestore(&pl330->lock, flags);
1492                         dma_pl330_rqcb(thrd->req[1 - thrd->lstenq].desc, err);
1493                         dma_pl330_rqcb(thrd->req[thrd->lstenq].desc, err);
1494                         spin_lock_irqsave(&pl330->lock, flags);
1495
1496                         thrd->req[0].desc = NULL;
1497                         thrd->req[1].desc = NULL;
1498                         thrd->req_running = -1;
1499
1500                         /* Clear the reset flag */
1501                         pl330->dmac_tbd.reset_chan &= ~(1 << i);
1502                 }
1503         }
1504
1505         spin_unlock_irqrestore(&pl330->lock, flags);
1506
1507         return;
1508 }
1509
1510 /* Returns 1 if state was updated, 0 otherwise */
1511 static int pl330_update(struct pl330_dmac *pl330)
1512 {
1513         struct dma_pl330_desc *descdone, *tmp;
1514         unsigned long flags;
1515         void __iomem *regs;
1516         u32 val;
1517         int id, ev, ret = 0;
1518
1519         regs = pl330->base;
1520
1521         spin_lock_irqsave(&pl330->lock, flags);
1522
1523         val = readl(regs + FSM) & 0x1;
1524         if (val)
1525                 pl330->dmac_tbd.reset_mngr = true;
1526         else
1527                 pl330->dmac_tbd.reset_mngr = false;
1528
1529         val = readl(regs + FSC) & ((1 << pl330->pcfg.num_chan) - 1);
1530         pl330->dmac_tbd.reset_chan |= val;
1531         if (val) {
1532                 int i = 0;
1533                 while (i < pl330->pcfg.num_chan) {
1534                         if (val & (1 << i)) {
1535                                 dev_info(pl330->ddma.dev,
1536                                         "Reset Channel-%d\t CS-%x FTC-%x\n",
1537                                                 i, readl(regs + CS(i)),
1538                                                 readl(regs + FTC(i)));
1539                                 _stop(&pl330->channels[i]);
1540                         }
1541                         i++;
1542                 }
1543         }
1544
1545         /* Check which event happened i.e, thread notified */
1546         val = readl(regs + ES);
1547         if (pl330->pcfg.num_events < 32
1548                         && val & ~((1 << pl330->pcfg.num_events) - 1)) {
1549                 pl330->dmac_tbd.reset_dmac = true;
1550                 dev_err(pl330->ddma.dev, "%s:%d Unexpected!\n", __func__,
1551                         __LINE__);
1552                 ret = 1;
1553                 goto updt_exit;
1554         }
1555
1556         for (ev = 0; ev < pl330->pcfg.num_events; ev++) {
1557                 if (val & (1 << ev)) { /* Event occurred */
1558                         struct pl330_thread *thrd;
1559                         u32 inten = readl(regs + INTEN);
1560                         int active;
1561
1562                         /* Clear the event */
1563                         if (inten & (1 << ev))
1564                                 writel(1 << ev, regs + INTCLR);
1565
1566                         ret = 1;
1567
1568                         id = pl330->events[ev];
1569
1570                         thrd = &pl330->channels[id];
1571
1572                         active = thrd->req_running;
1573                         if (active == -1) /* Aborted */
1574                                 continue;
1575
1576                         /* Detach the req */
1577                         descdone = thrd->req[active].desc;
1578                         thrd->req[active].desc = NULL;
1579
1580                         thrd->req_running = -1;
1581
1582                         /* Get going again ASAP */
1583                         _start(thrd);
1584
1585                         /* For now, just make a list of callbacks to be done */
1586                         list_add_tail(&descdone->rqd, &pl330->req_done);
1587                 }
1588         }
1589
1590         /* Now that we are in no hurry, do the callbacks */
1591         list_for_each_entry_safe(descdone, tmp, &pl330->req_done, rqd) {
1592                 list_del(&descdone->rqd);
1593                 spin_unlock_irqrestore(&pl330->lock, flags);
1594                 dma_pl330_rqcb(descdone, PL330_ERR_NONE);
1595                 spin_lock_irqsave(&pl330->lock, flags);
1596         }
1597
1598 updt_exit:
1599         spin_unlock_irqrestore(&pl330->lock, flags);
1600
1601         if (pl330->dmac_tbd.reset_dmac
1602                         || pl330->dmac_tbd.reset_mngr
1603                         || pl330->dmac_tbd.reset_chan) {
1604                 ret = 1;
1605                 tasklet_schedule(&pl330->tasks);
1606         }
1607
1608         return ret;
1609 }
1610
1611 /* Reserve an event */
1612 static inline int _alloc_event(struct pl330_thread *thrd)
1613 {
1614         struct pl330_dmac *pl330 = thrd->dmac;
1615         int ev;
1616
1617         for (ev = 0; ev < pl330->pcfg.num_events; ev++)
1618                 if (pl330->events[ev] == -1) {
1619                         pl330->events[ev] = thrd->id;
1620                         return ev;
1621                 }
1622
1623         return -1;
1624 }
1625
1626 static bool _chan_ns(const struct pl330_dmac *pl330, int i)
1627 {
1628         return pl330->pcfg.irq_ns & (1 << i);
1629 }
1630
1631 /* Upon success, returns IdentityToken for the
1632  * allocated channel, NULL otherwise.
1633  */
1634 static struct pl330_thread *pl330_request_channel(struct pl330_dmac *pl330)
1635 {
1636         struct pl330_thread *thrd = NULL;
1637         int chans, i;
1638
1639         if (pl330->state == DYING)
1640                 return NULL;
1641
1642         chans = pl330->pcfg.num_chan;
1643
1644         for (i = 0; i < chans; i++) {
1645                 thrd = &pl330->channels[i];
1646                 if ((thrd->free) && (!_manager_ns(thrd) ||
1647                                         _chan_ns(pl330, i))) {
1648                         thrd->ev = _alloc_event(thrd);
1649                         if (thrd->ev >= 0) {
1650                                 thrd->free = false;
1651                                 thrd->lstenq = 1;
1652                                 thrd->req[0].desc = NULL;
1653                                 thrd->req[1].desc = NULL;
1654                                 thrd->req_running = -1;
1655                                 break;
1656                         }
1657                 }
1658                 thrd = NULL;
1659         }
1660
1661         return thrd;
1662 }
1663
1664 /* Release an event */
1665 static inline void _free_event(struct pl330_thread *thrd, int ev)
1666 {
1667         struct pl330_dmac *pl330 = thrd->dmac;
1668
1669         /* If the event is valid and was held by the thread */
1670         if (ev >= 0 && ev < pl330->pcfg.num_events
1671                         && pl330->events[ev] == thrd->id)
1672                 pl330->events[ev] = -1;
1673 }
1674
1675 static void pl330_release_channel(struct pl330_thread *thrd)
1676 {
1677         struct pl330_dmac *pl330;
1678
1679         if (!thrd || thrd->free)
1680                 return;
1681
1682         _stop(thrd);
1683
1684         dma_pl330_rqcb(thrd->req[1 - thrd->lstenq].desc, PL330_ERR_ABORT);
1685         dma_pl330_rqcb(thrd->req[thrd->lstenq].desc, PL330_ERR_ABORT);
1686
1687         pl330 = thrd->dmac;
1688
1689         _free_event(thrd, thrd->ev);
1690         thrd->free = true;
1691 }
1692
1693 /* Initialize the structure for PL330 configuration, that can be used
1694  * by the client driver the make best use of the DMAC
1695  */
1696 static void read_dmac_config(struct pl330_dmac *pl330)
1697 {
1698         void __iomem *regs = pl330->base;
1699         u32 val;
1700
1701         val = readl(regs + CRD) >> CRD_DATA_WIDTH_SHIFT;
1702         val &= CRD_DATA_WIDTH_MASK;
1703         pl330->pcfg.data_bus_width = 8 * (1 << val);
1704
1705         val = readl(regs + CRD) >> CRD_DATA_BUFF_SHIFT;
1706         val &= CRD_DATA_BUFF_MASK;
1707         pl330->pcfg.data_buf_dep = val + 1;
1708
1709         val = readl(regs + CR0) >> CR0_NUM_CHANS_SHIFT;
1710         val &= CR0_NUM_CHANS_MASK;
1711         val += 1;
1712         pl330->pcfg.num_chan = val;
1713
1714         val = readl(regs + CR0);
1715         if (val & CR0_PERIPH_REQ_SET) {
1716                 val = (val >> CR0_NUM_PERIPH_SHIFT) & CR0_NUM_PERIPH_MASK;
1717                 val += 1;
1718                 pl330->pcfg.num_peri = val;
1719                 pl330->pcfg.peri_ns = readl(regs + CR4);
1720         } else {
1721                 pl330->pcfg.num_peri = 0;
1722         }
1723
1724         val = readl(regs + CR0);
1725         if (val & CR0_BOOT_MAN_NS)
1726                 pl330->pcfg.mode |= DMAC_MODE_NS;
1727         else
1728                 pl330->pcfg.mode &= ~DMAC_MODE_NS;
1729
1730         val = readl(regs + CR0) >> CR0_NUM_EVENTS_SHIFT;
1731         val &= CR0_NUM_EVENTS_MASK;
1732         val += 1;
1733         pl330->pcfg.num_events = val;
1734
1735         pl330->pcfg.irq_ns = readl(regs + CR3);
1736 }
1737
1738 static inline void _reset_thread(struct pl330_thread *thrd)
1739 {
1740         struct pl330_dmac *pl330 = thrd->dmac;
1741
1742         thrd->req[0].mc_cpu = pl330->mcode_cpu
1743                                 + (thrd->id * pl330->mcbufsz);
1744         thrd->req[0].mc_bus = pl330->mcode_bus
1745                                 + (thrd->id * pl330->mcbufsz);
1746         thrd->req[0].desc = NULL;
1747
1748         thrd->req[1].mc_cpu = thrd->req[0].mc_cpu
1749                                 + pl330->mcbufsz / 2;
1750         thrd->req[1].mc_bus = thrd->req[0].mc_bus
1751                                 + pl330->mcbufsz / 2;
1752         thrd->req[1].desc = NULL;
1753
1754         thrd->req_running = -1;
1755 }
1756
1757 static int dmac_alloc_threads(struct pl330_dmac *pl330)
1758 {
1759         int chans = pl330->pcfg.num_chan;
1760         struct pl330_thread *thrd;
1761         int i;
1762
1763         /* Allocate 1 Manager and 'chans' Channel threads */
1764         pl330->channels = kzalloc((1 + chans) * sizeof(*thrd),
1765                                         GFP_KERNEL);
1766         if (!pl330->channels)
1767                 return -ENOMEM;
1768
1769         /* Init Channel threads */
1770         for (i = 0; i < chans; i++) {
1771                 thrd = &pl330->channels[i];
1772                 thrd->id = i;
1773                 thrd->dmac = pl330;
1774                 _reset_thread(thrd);
1775                 thrd->free = true;
1776         }
1777
1778         /* MANAGER is indexed at the end */
1779         thrd = &pl330->channels[chans];
1780         thrd->id = chans;
1781         thrd->dmac = pl330;
1782         thrd->free = false;
1783         pl330->manager = thrd;
1784
1785         return 0;
1786 }
1787
1788 static int dmac_alloc_resources(struct pl330_dmac *pl330)
1789 {
1790         int chans = pl330->pcfg.num_chan;
1791         int ret;
1792
1793         /*
1794          * Alloc MicroCode buffer for 'chans' Channel threads.
1795          * A channel's buffer offset is (Channel_Id * MCODE_BUFF_PERCHAN)
1796          */
1797         pl330->mcode_cpu = dma_alloc_attrs(pl330->ddma.dev,
1798                                 chans * pl330->mcbufsz,
1799                                 &pl330->mcode_bus, GFP_KERNEL,
1800                                 DMA_ATTR_PRIVILEGED);
1801         if (!pl330->mcode_cpu) {
1802                 dev_err(pl330->ddma.dev, "%s:%d Can't allocate memory!\n",
1803                         __func__, __LINE__);
1804                 return -ENOMEM;
1805         }
1806
1807         ret = dmac_alloc_threads(pl330);
1808         if (ret) {
1809                 dev_err(pl330->ddma.dev, "%s:%d Can't to create channels for DMAC!\n",
1810                         __func__, __LINE__);
1811                 dma_free_coherent(pl330->ddma.dev,
1812                                 chans * pl330->mcbufsz,
1813                                 pl330->mcode_cpu, pl330->mcode_bus);
1814                 return ret;
1815         }
1816
1817         return 0;
1818 }
1819
1820 static int pl330_add(struct pl330_dmac *pl330)
1821 {
1822         int i, ret;
1823
1824         /* Check if we can handle this DMAC */
1825         if ((pl330->pcfg.periph_id & 0xfffff) != PERIPH_ID_VAL) {
1826                 dev_err(pl330->ddma.dev, "PERIPH_ID 0x%x !\n",
1827                         pl330->pcfg.periph_id);
1828                 return -EINVAL;
1829         }
1830
1831         /* Read the configuration of the DMAC */
1832         read_dmac_config(pl330);
1833
1834         if (pl330->pcfg.num_events == 0) {
1835                 dev_err(pl330->ddma.dev, "%s:%d Can't work without events!\n",
1836                         __func__, __LINE__);
1837                 return -EINVAL;
1838         }
1839
1840         spin_lock_init(&pl330->lock);
1841
1842         INIT_LIST_HEAD(&pl330->req_done);
1843
1844         /* Use default MC buffer size if not provided */
1845         if (!pl330->mcbufsz)
1846                 pl330->mcbufsz = MCODE_BUFF_PER_REQ * 2;
1847
1848         /* Mark all events as free */
1849         for (i = 0; i < pl330->pcfg.num_events; i++)
1850                 pl330->events[i] = -1;
1851
1852         /* Allocate resources needed by the DMAC */
1853         ret = dmac_alloc_resources(pl330);
1854         if (ret) {
1855                 dev_err(pl330->ddma.dev, "Unable to create channels for DMAC\n");
1856                 return ret;
1857         }
1858
1859         tasklet_init(&pl330->tasks, pl330_dotask, (unsigned long) pl330);
1860
1861         pl330->state = INIT;
1862
1863         return 0;
1864 }
1865
1866 static int dmac_free_threads(struct pl330_dmac *pl330)
1867 {
1868         struct pl330_thread *thrd;
1869         int i;
1870
1871         /* Release Channel threads */
1872         for (i = 0; i < pl330->pcfg.num_chan; i++) {
1873                 thrd = &pl330->channels[i];
1874                 pl330_release_channel(thrd);
1875         }
1876
1877         /* Free memory */
1878         kfree(pl330->channels);
1879
1880         return 0;
1881 }
1882
1883 static void pl330_del(struct pl330_dmac *pl330)
1884 {
1885         pl330->state = UNINIT;
1886
1887         tasklet_kill(&pl330->tasks);
1888
1889         /* Free DMAC resources */
1890         dmac_free_threads(pl330);
1891
1892         dma_free_coherent(pl330->ddma.dev,
1893                 pl330->pcfg.num_chan * pl330->mcbufsz, pl330->mcode_cpu,
1894                 pl330->mcode_bus);
1895 }
1896
1897 /* forward declaration */
1898 static struct amba_driver pl330_driver;
1899
1900 static inline struct dma_pl330_chan *
1901 to_pchan(struct dma_chan *ch)
1902 {
1903         if (!ch)
1904                 return NULL;
1905
1906         return container_of(ch, struct dma_pl330_chan, chan);
1907 }
1908
1909 static inline struct dma_pl330_desc *
1910 to_desc(struct dma_async_tx_descriptor *tx)
1911 {
1912         return container_of(tx, struct dma_pl330_desc, txd);
1913 }
1914
1915 static inline void fill_queue(struct dma_pl330_chan *pch)
1916 {
1917         struct dma_pl330_desc *desc;
1918         int ret;
1919
1920         list_for_each_entry(desc, &pch->work_list, node) {
1921
1922                 /* If already submitted */
1923                 if (desc->status == BUSY)
1924                         continue;
1925
1926                 ret = pl330_submit_req(pch->thread, desc);
1927                 if (!ret) {
1928                         desc->status = BUSY;
1929                 } else if (ret == -EAGAIN) {
1930                         /* QFull or DMAC Dying */
1931                         break;
1932                 } else {
1933                         /* Unacceptable request */
1934                         desc->status = DONE;
1935                         dev_err(pch->dmac->ddma.dev, "%s:%d Bad Desc(%d)\n",
1936                                         __func__, __LINE__, desc->txd.cookie);
1937                         tasklet_schedule(&pch->task);
1938                 }
1939         }
1940 }
1941
1942 static void pl330_tasklet(unsigned long data)
1943 {
1944         struct dma_pl330_chan *pch = (struct dma_pl330_chan *)data;
1945         struct dma_pl330_desc *desc, *_dt;
1946         unsigned long flags;
1947         bool power_down = false;
1948
1949         spin_lock_irqsave(&pch->lock, flags);
1950
1951         /* Pick up ripe tomatoes */
1952         list_for_each_entry_safe(desc, _dt, &pch->work_list, node)
1953                 if (desc->status == DONE) {
1954                         if (!pch->cyclic)
1955                                 dma_cookie_complete(&desc->txd);
1956                         list_move_tail(&desc->node, &pch->completed_list);
1957                 }
1958
1959         /* Try to submit a req imm. next to the last completed cookie */
1960         fill_queue(pch);
1961
1962         if (list_empty(&pch->work_list)) {
1963                 spin_lock(&pch->thread->dmac->lock);
1964                 _stop(pch->thread);
1965                 spin_unlock(&pch->thread->dmac->lock);
1966                 power_down = true;
1967                 pch->active = false;
1968         } else {
1969                 /* Make sure the PL330 Channel thread is active */
1970                 spin_lock(&pch->thread->dmac->lock);
1971                 _start(pch->thread);
1972                 spin_unlock(&pch->thread->dmac->lock);
1973         }
1974
1975         while (!list_empty(&pch->completed_list)) {
1976                 struct dmaengine_desc_callback cb;
1977
1978                 desc = list_first_entry(&pch->completed_list,
1979                                         struct dma_pl330_desc, node);
1980
1981                 dmaengine_desc_get_callback(&desc->txd, &cb);
1982
1983                 if (pch->cyclic) {
1984                         desc->status = PREP;
1985                         list_move_tail(&desc->node, &pch->work_list);
1986                         if (power_down) {
1987                                 pch->active = true;
1988                                 spin_lock(&pch->thread->dmac->lock);
1989                                 _start(pch->thread);
1990                                 spin_unlock(&pch->thread->dmac->lock);
1991                                 power_down = false;
1992                         }
1993                 } else {
1994                         desc->status = FREE;
1995                         list_move_tail(&desc->node, &pch->dmac->desc_pool);
1996                 }
1997
1998                 dma_descriptor_unmap(&desc->txd);
1999
2000                 if (dmaengine_desc_callback_valid(&cb)) {
2001                         spin_unlock_irqrestore(&pch->lock, flags);
2002                         dmaengine_desc_callback_invoke(&cb, NULL);
2003                         spin_lock_irqsave(&pch->lock, flags);
2004                 }
2005         }
2006         spin_unlock_irqrestore(&pch->lock, flags);
2007
2008         /* If work list empty, power down */
2009         if (power_down) {
2010                 pm_runtime_mark_last_busy(pch->dmac->ddma.dev);
2011                 pm_runtime_put_autosuspend(pch->dmac->ddma.dev);
2012         }
2013 }
2014
2015 static struct dma_chan *of_dma_pl330_xlate(struct of_phandle_args *dma_spec,
2016                                                 struct of_dma *ofdma)
2017 {
2018         int count = dma_spec->args_count;
2019         struct pl330_dmac *pl330 = ofdma->of_dma_data;
2020         unsigned int chan_id;
2021
2022         if (!pl330)
2023                 return NULL;
2024
2025         if (count != 1)
2026                 return NULL;
2027
2028         chan_id = dma_spec->args[0];
2029         if (chan_id >= pl330->num_peripherals)
2030                 return NULL;
2031
2032         return dma_get_slave_channel(&pl330->peripherals[chan_id].chan);
2033 }
2034
2035 static int pl330_alloc_chan_resources(struct dma_chan *chan)
2036 {
2037         struct dma_pl330_chan *pch = to_pchan(chan);
2038         struct pl330_dmac *pl330 = pch->dmac;
2039         unsigned long flags;
2040
2041         spin_lock_irqsave(&pl330->lock, flags);
2042
2043         dma_cookie_init(chan);
2044         pch->cyclic = false;
2045
2046         pch->thread = pl330_request_channel(pl330);
2047         if (!pch->thread) {
2048                 spin_unlock_irqrestore(&pl330->lock, flags);
2049                 return -ENOMEM;
2050         }
2051
2052         tasklet_init(&pch->task, pl330_tasklet, (unsigned long) pch);
2053
2054         spin_unlock_irqrestore(&pl330->lock, flags);
2055
2056         return 1;
2057 }
2058
2059 /*
2060  * We need the data direction between the DMAC (the dma-mapping "device") and
2061  * the FIFO (the dmaengine "dev"), from the FIFO's point of view. Confusing!
2062  */
2063 static enum dma_data_direction
2064 pl330_dma_slave_map_dir(enum dma_transfer_direction dir)
2065 {
2066         switch (dir) {
2067         case DMA_MEM_TO_DEV:
2068                 return DMA_FROM_DEVICE;
2069         case DMA_DEV_TO_MEM:
2070                 return DMA_TO_DEVICE;
2071         case DMA_DEV_TO_DEV:
2072                 return DMA_BIDIRECTIONAL;
2073         default:
2074                 return DMA_NONE;
2075         }
2076 }
2077
2078 static void pl330_unprep_slave_fifo(struct dma_pl330_chan *pch)
2079 {
2080         if (pch->dir != DMA_NONE)
2081                 dma_unmap_resource(pch->chan.device->dev, pch->fifo_dma,
2082                                    1 << pch->burst_sz, pch->dir, 0);
2083         pch->dir = DMA_NONE;
2084 }
2085
2086
2087 static bool pl330_prep_slave_fifo(struct dma_pl330_chan *pch,
2088                                   enum dma_transfer_direction dir)
2089 {
2090         struct device *dev = pch->chan.device->dev;
2091         enum dma_data_direction dma_dir = pl330_dma_slave_map_dir(dir);
2092
2093         /* Already mapped for this config? */
2094         if (pch->dir == dma_dir)
2095                 return true;
2096
2097         pl330_unprep_slave_fifo(pch);
2098         pch->fifo_dma = dma_map_resource(dev, pch->fifo_addr,
2099                                          1 << pch->burst_sz, dma_dir, 0);
2100         if (dma_mapping_error(dev, pch->fifo_dma))
2101                 return false;
2102
2103         pch->dir = dma_dir;
2104         return true;
2105 }
2106
2107 static int pl330_config(struct dma_chan *chan,
2108                         struct dma_slave_config *slave_config)
2109 {
2110         struct dma_pl330_chan *pch = to_pchan(chan);
2111
2112         pl330_unprep_slave_fifo(pch);
2113         if (slave_config->direction == DMA_MEM_TO_DEV) {
2114                 if (slave_config->dst_addr)
2115                         pch->fifo_addr = slave_config->dst_addr;
2116                 if (slave_config->dst_addr_width)
2117                         pch->burst_sz = __ffs(slave_config->dst_addr_width);
2118                 if (slave_config->dst_maxburst)
2119                         pch->burst_len = slave_config->dst_maxburst;
2120         } else if (slave_config->direction == DMA_DEV_TO_MEM) {
2121                 if (slave_config->src_addr)
2122                         pch->fifo_addr = slave_config->src_addr;
2123                 if (slave_config->src_addr_width)
2124                         pch->burst_sz = __ffs(slave_config->src_addr_width);
2125                 if (slave_config->src_maxburst)
2126                         pch->burst_len = slave_config->src_maxburst;
2127         }
2128
2129         return 0;
2130 }
2131
2132 static int pl330_terminate_all(struct dma_chan *chan)
2133 {
2134         struct dma_pl330_chan *pch = to_pchan(chan);
2135         struct dma_pl330_desc *desc;
2136         unsigned long flags;
2137         struct pl330_dmac *pl330 = pch->dmac;
2138         LIST_HEAD(list);
2139         bool power_down = false;
2140
2141         pm_runtime_get_sync(pl330->ddma.dev);
2142         spin_lock_irqsave(&pch->lock, flags);
2143         spin_lock(&pl330->lock);
2144         _stop(pch->thread);
2145         spin_unlock(&pl330->lock);
2146
2147         pch->thread->req[0].desc = NULL;
2148         pch->thread->req[1].desc = NULL;
2149         pch->thread->req_running = -1;
2150         power_down = pch->active;
2151         pch->active = false;
2152
2153         /* Mark all desc done */
2154         list_for_each_entry(desc, &pch->submitted_list, node) {
2155                 desc->status = FREE;
2156                 dma_cookie_complete(&desc->txd);
2157         }
2158
2159         list_for_each_entry(desc, &pch->work_list , node) {
2160                 desc->status = FREE;
2161                 dma_cookie_complete(&desc->txd);
2162         }
2163
2164         list_splice_tail_init(&pch->submitted_list, &pl330->desc_pool);
2165         list_splice_tail_init(&pch->work_list, &pl330->desc_pool);
2166         list_splice_tail_init(&pch->completed_list, &pl330->desc_pool);
2167         spin_unlock_irqrestore(&pch->lock, flags);
2168         pm_runtime_mark_last_busy(pl330->ddma.dev);
2169         if (power_down)
2170                 pm_runtime_put_autosuspend(pl330->ddma.dev);
2171         pm_runtime_put_autosuspend(pl330->ddma.dev);
2172
2173         return 0;
2174 }
2175
2176 /*
2177  * We don't support DMA_RESUME command because of hardware
2178  * limitations, so after pausing the channel we cannot restore
2179  * it to active state. We have to terminate channel and setup
2180  * DMA transfer again. This pause feature was implemented to
2181  * allow safely read residue before channel termination.
2182  */
2183 static int pl330_pause(struct dma_chan *chan)
2184 {
2185         struct dma_pl330_chan *pch = to_pchan(chan);
2186         struct pl330_dmac *pl330 = pch->dmac;
2187         unsigned long flags;
2188
2189         pm_runtime_get_sync(pl330->ddma.dev);
2190         spin_lock_irqsave(&pch->lock, flags);
2191
2192         spin_lock(&pl330->lock);
2193         _stop(pch->thread);
2194         spin_unlock(&pl330->lock);
2195
2196         spin_unlock_irqrestore(&pch->lock, flags);
2197         pm_runtime_mark_last_busy(pl330->ddma.dev);
2198         pm_runtime_put_autosuspend(pl330->ddma.dev);
2199
2200         return 0;
2201 }
2202
2203 static void pl330_free_chan_resources(struct dma_chan *chan)
2204 {
2205         struct dma_pl330_chan *pch = to_pchan(chan);
2206         struct pl330_dmac *pl330 = pch->dmac;
2207         unsigned long flags;
2208
2209         tasklet_kill(&pch->task);
2210
2211         pm_runtime_get_sync(pch->dmac->ddma.dev);
2212         spin_lock_irqsave(&pl330->lock, flags);
2213
2214         pl330_release_channel(pch->thread);
2215         pch->thread = NULL;
2216
2217         if (pch->cyclic)
2218                 list_splice_tail_init(&pch->work_list, &pch->dmac->desc_pool);
2219
2220         spin_unlock_irqrestore(&pl330->lock, flags);
2221         pm_runtime_mark_last_busy(pch->dmac->ddma.dev);
2222         pm_runtime_put_autosuspend(pch->dmac->ddma.dev);
2223         pl330_unprep_slave_fifo(pch);
2224 }
2225
2226 static int pl330_get_current_xferred_count(struct dma_pl330_chan *pch,
2227                                            struct dma_pl330_desc *desc)
2228 {
2229         struct pl330_thread *thrd = pch->thread;
2230         struct pl330_dmac *pl330 = pch->dmac;
2231         void __iomem *regs = thrd->dmac->base;
2232         u32 val, addr;
2233
2234         pm_runtime_get_sync(pl330->ddma.dev);
2235         val = addr = 0;
2236         if (desc->rqcfg.src_inc) {
2237                 val = readl(regs + SA(thrd->id));
2238                 addr = desc->px.src_addr;
2239         } else {
2240                 val = readl(regs + DA(thrd->id));
2241                 addr = desc->px.dst_addr;
2242         }
2243         pm_runtime_mark_last_busy(pch->dmac->ddma.dev);
2244         pm_runtime_put_autosuspend(pl330->ddma.dev);
2245
2246         /* If DMAMOV hasn't finished yet, SAR/DAR can be zero */
2247         if (!val)
2248                 return 0;
2249
2250         return val - addr;
2251 }
2252
2253 static enum dma_status
2254 pl330_tx_status(struct dma_chan *chan, dma_cookie_t cookie,
2255                  struct dma_tx_state *txstate)
2256 {
2257         enum dma_status ret;
2258         unsigned long flags;
2259         struct dma_pl330_desc *desc, *running = NULL, *last_enq = NULL;
2260         struct dma_pl330_chan *pch = to_pchan(chan);
2261         unsigned int transferred, residual = 0;
2262
2263         ret = dma_cookie_status(chan, cookie, txstate);
2264
2265         if (!txstate)
2266                 return ret;
2267
2268         if (ret == DMA_COMPLETE)
2269                 goto out;
2270
2271         spin_lock_irqsave(&pch->lock, flags);
2272         spin_lock(&pch->thread->dmac->lock);
2273
2274         if (pch->thread->req_running != -1)
2275                 running = pch->thread->req[pch->thread->req_running].desc;
2276
2277         last_enq = pch->thread->req[pch->thread->lstenq].desc;
2278
2279         /* Check in pending list */
2280         list_for_each_entry(desc, &pch->work_list, node) {
2281                 if (desc->status == DONE)
2282                         transferred = desc->bytes_requested;
2283                 else if (running && desc == running)
2284                         transferred =
2285                                 pl330_get_current_xferred_count(pch, desc);
2286                 else if (desc->status == BUSY)
2287                         /*
2288                          * Busy but not running means either just enqueued,
2289                          * or finished and not yet marked done
2290                          */
2291                         if (desc == last_enq)
2292                                 transferred = 0;
2293                         else
2294                                 transferred = desc->bytes_requested;
2295                 else
2296                         transferred = 0;
2297                 residual += desc->bytes_requested - transferred;
2298                 if (desc->txd.cookie == cookie) {
2299                         switch (desc->status) {
2300                         case DONE:
2301                                 ret = DMA_COMPLETE;
2302                                 break;
2303                         case PREP:
2304                         case BUSY:
2305                                 ret = DMA_IN_PROGRESS;
2306                                 break;
2307                         default:
2308                                 WARN_ON(1);
2309                         }
2310                         break;
2311                 }
2312                 if (desc->last)
2313                         residual = 0;
2314         }
2315         spin_unlock(&pch->thread->dmac->lock);
2316         spin_unlock_irqrestore(&pch->lock, flags);
2317
2318 out:
2319         dma_set_residue(txstate, residual);
2320
2321         return ret;
2322 }
2323
2324 static void pl330_issue_pending(struct dma_chan *chan)
2325 {
2326         struct dma_pl330_chan *pch = to_pchan(chan);
2327         unsigned long flags;
2328
2329         spin_lock_irqsave(&pch->lock, flags);
2330         if (list_empty(&pch->work_list)) {
2331                 /*
2332                  * Warn on nothing pending. Empty submitted_list may
2333                  * break our pm_runtime usage counter as it is
2334                  * updated on work_list emptiness status.
2335                  */
2336                 WARN_ON(list_empty(&pch->submitted_list));
2337                 pch->active = true;
2338                 pm_runtime_get_sync(pch->dmac->ddma.dev);
2339         }
2340         list_splice_tail_init(&pch->submitted_list, &pch->work_list);
2341         spin_unlock_irqrestore(&pch->lock, flags);
2342
2343         pl330_tasklet((unsigned long)pch);
2344 }
2345
2346 /*
2347  * We returned the last one of the circular list of descriptor(s)
2348  * from prep_xxx, so the argument to submit corresponds to the last
2349  * descriptor of the list.
2350  */
2351 static dma_cookie_t pl330_tx_submit(struct dma_async_tx_descriptor *tx)
2352 {
2353         struct dma_pl330_desc *desc, *last = to_desc(tx);
2354         struct dma_pl330_chan *pch = to_pchan(tx->chan);
2355         dma_cookie_t cookie;
2356         unsigned long flags;
2357
2358         spin_lock_irqsave(&pch->lock, flags);
2359
2360         /* Assign cookies to all nodes */
2361         while (!list_empty(&last->node)) {
2362                 desc = list_entry(last->node.next, struct dma_pl330_desc, node);
2363                 if (pch->cyclic) {
2364                         desc->txd.callback = last->txd.callback;
2365                         desc->txd.callback_param = last->txd.callback_param;
2366                 }
2367                 desc->last = false;
2368
2369                 dma_cookie_assign(&desc->txd);
2370
2371                 list_move_tail(&desc->node, &pch->submitted_list);
2372         }
2373
2374         last->last = true;
2375         cookie = dma_cookie_assign(&last->txd);
2376         list_add_tail(&last->node, &pch->submitted_list);
2377         spin_unlock_irqrestore(&pch->lock, flags);
2378
2379         return cookie;
2380 }
2381
2382 static inline void _init_desc(struct dma_pl330_desc *desc)
2383 {
2384         desc->rqcfg.swap = SWAP_NO;
2385         desc->rqcfg.scctl = CCTRL0;
2386         desc->rqcfg.dcctl = CCTRL0;
2387         desc->txd.tx_submit = pl330_tx_submit;
2388
2389         INIT_LIST_HEAD(&desc->node);
2390 }
2391
2392 /* Returns the number of descriptors added to the DMAC pool */
2393 static int add_desc(struct pl330_dmac *pl330, gfp_t flg, int count)
2394 {
2395         struct dma_pl330_desc *desc;
2396         unsigned long flags;
2397         int i;
2398
2399         desc = kcalloc(count, sizeof(*desc), flg);
2400         if (!desc)
2401                 return 0;
2402
2403         spin_lock_irqsave(&pl330->pool_lock, flags);
2404
2405         for (i = 0; i < count; i++) {
2406                 _init_desc(&desc[i]);
2407                 list_add_tail(&desc[i].node, &pl330->desc_pool);
2408         }
2409
2410         spin_unlock_irqrestore(&pl330->pool_lock, flags);
2411
2412         return count;
2413 }
2414
2415 static struct dma_pl330_desc *pluck_desc(struct pl330_dmac *pl330)
2416 {
2417         struct dma_pl330_desc *desc = NULL;
2418         unsigned long flags;
2419
2420         spin_lock_irqsave(&pl330->pool_lock, flags);
2421
2422         if (!list_empty(&pl330->desc_pool)) {
2423                 desc = list_entry(pl330->desc_pool.next,
2424                                 struct dma_pl330_desc, node);
2425
2426                 list_del_init(&desc->node);
2427
2428                 desc->status = PREP;
2429                 desc->txd.callback = NULL;
2430         }
2431
2432         spin_unlock_irqrestore(&pl330->pool_lock, flags);
2433
2434         return desc;
2435 }
2436
2437 static struct dma_pl330_desc *pl330_get_desc(struct dma_pl330_chan *pch)
2438 {
2439         struct pl330_dmac *pl330 = pch->dmac;
2440         u8 *peri_id = pch->chan.private;
2441         struct dma_pl330_desc *desc;
2442
2443         /* Pluck one desc from the pool of DMAC */
2444         desc = pluck_desc(pl330);
2445
2446         /* If the DMAC pool is empty, alloc new */
2447         if (!desc) {
2448                 if (!add_desc(pl330, GFP_ATOMIC, 1))
2449                         return NULL;
2450
2451                 /* Try again */
2452                 desc = pluck_desc(pl330);
2453                 if (!desc) {
2454                         dev_err(pch->dmac->ddma.dev,
2455                                 "%s:%d ALERT!\n", __func__, __LINE__);
2456                         return NULL;
2457                 }
2458         }
2459
2460         /* Initialize the descriptor */
2461         desc->pchan = pch;
2462         desc->txd.cookie = 0;
2463         async_tx_ack(&desc->txd);
2464
2465         desc->peri = peri_id ? pch->chan.chan_id : 0;
2466         desc->rqcfg.pcfg = &pch->dmac->pcfg;
2467
2468         dma_async_tx_descriptor_init(&desc->txd, &pch->chan);
2469
2470         return desc;
2471 }
2472
2473 static inline void fill_px(struct pl330_xfer *px,
2474                 dma_addr_t dst, dma_addr_t src, size_t len)
2475 {
2476         px->bytes = len;
2477         px->dst_addr = dst;
2478         px->src_addr = src;
2479 }
2480
2481 static struct dma_pl330_desc *
2482 __pl330_prep_dma_memcpy(struct dma_pl330_chan *pch, dma_addr_t dst,
2483                 dma_addr_t src, size_t len)
2484 {
2485         struct dma_pl330_desc *desc = pl330_get_desc(pch);
2486
2487         if (!desc) {
2488                 dev_err(pch->dmac->ddma.dev, "%s:%d Unable to fetch desc\n",
2489                         __func__, __LINE__);
2490                 return NULL;
2491         }
2492
2493         /*
2494          * Ideally we should lookout for reqs bigger than
2495          * those that can be programmed with 256 bytes of
2496          * MC buffer, but considering a req size is seldom
2497          * going to be word-unaligned and more than 200MB,
2498          * we take it easy.
2499          * Also, should the limit is reached we'd rather
2500          * have the platform increase MC buffer size than
2501          * complicating this API driver.
2502          */
2503         fill_px(&desc->px, dst, src, len);
2504
2505         return desc;
2506 }
2507
2508 /* Call after fixing burst size */
2509 static inline int get_burst_len(struct dma_pl330_desc *desc, size_t len)
2510 {
2511         struct dma_pl330_chan *pch = desc->pchan;
2512         struct pl330_dmac *pl330 = pch->dmac;
2513         int burst_len;
2514
2515         burst_len = pl330->pcfg.data_bus_width / 8;
2516         burst_len *= pl330->pcfg.data_buf_dep / pl330->pcfg.num_chan;
2517         burst_len >>= desc->rqcfg.brst_size;
2518
2519         /* src/dst_burst_len can't be more than 16 */
2520         if (burst_len > 16)
2521                 burst_len = 16;
2522
2523         while (burst_len > 1) {
2524                 if (!(len % (burst_len << desc->rqcfg.brst_size)))
2525                         break;
2526                 burst_len--;
2527         }
2528
2529         return burst_len;
2530 }
2531
2532 static struct dma_async_tx_descriptor *pl330_prep_dma_cyclic(
2533                 struct dma_chan *chan, dma_addr_t dma_addr, size_t len,
2534                 size_t period_len, enum dma_transfer_direction direction,
2535                 unsigned long flags)
2536 {
2537         struct dma_pl330_desc *desc = NULL, *first = NULL;
2538         struct dma_pl330_chan *pch = to_pchan(chan);
2539         struct pl330_dmac *pl330 = pch->dmac;
2540         unsigned int i;
2541         dma_addr_t dst;
2542         dma_addr_t src;
2543
2544         if (len % period_len != 0)
2545                 return NULL;
2546
2547         if (!is_slave_direction(direction)) {
2548                 dev_err(pch->dmac->ddma.dev, "%s:%d Invalid dma direction\n",
2549                 __func__, __LINE__);
2550                 return NULL;
2551         }
2552
2553         if (!pl330_prep_slave_fifo(pch, direction))
2554                 return NULL;
2555
2556         for (i = 0; i < len / period_len; i++) {
2557                 desc = pl330_get_desc(pch);
2558                 if (!desc) {
2559                         dev_err(pch->dmac->ddma.dev, "%s:%d Unable to fetch desc\n",
2560                                 __func__, __LINE__);
2561
2562                         if (!first)
2563                                 return NULL;
2564
2565                         spin_lock_irqsave(&pl330->pool_lock, flags);
2566
2567                         while (!list_empty(&first->node)) {
2568                                 desc = list_entry(first->node.next,
2569                                                 struct dma_pl330_desc, node);
2570                                 list_move_tail(&desc->node, &pl330->desc_pool);
2571                         }
2572
2573                         list_move_tail(&first->node, &pl330->desc_pool);
2574
2575                         spin_unlock_irqrestore(&pl330->pool_lock, flags);
2576
2577                         return NULL;
2578                 }
2579
2580                 switch (direction) {
2581                 case DMA_MEM_TO_DEV:
2582                         desc->rqcfg.src_inc = 1;
2583                         desc->rqcfg.dst_inc = 0;
2584                         src = dma_addr;
2585                         dst = pch->fifo_dma;
2586                         break;
2587                 case DMA_DEV_TO_MEM:
2588                         desc->rqcfg.src_inc = 0;
2589                         desc->rqcfg.dst_inc = 1;
2590                         src = pch->fifo_dma;
2591                         dst = dma_addr;
2592                         break;
2593                 default:
2594                         break;
2595                 }
2596
2597                 desc->rqtype = direction;
2598                 desc->rqcfg.brst_size = pch->burst_sz;
2599                 desc->rqcfg.brst_len = 1;
2600                 desc->bytes_requested = period_len;
2601                 fill_px(&desc->px, dst, src, period_len);
2602
2603                 if (!first)
2604                         first = desc;
2605                 else
2606                         list_add_tail(&desc->node, &first->node);
2607
2608                 dma_addr += period_len;
2609         }
2610
2611         if (!desc)
2612                 return NULL;
2613
2614         pch->cyclic = true;
2615         desc->txd.flags = flags;
2616
2617         return &desc->txd;
2618 }
2619
2620 static struct dma_async_tx_descriptor *
2621 pl330_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dst,
2622                 dma_addr_t src, size_t len, unsigned long flags)
2623 {
2624         struct dma_pl330_desc *desc;
2625         struct dma_pl330_chan *pch = to_pchan(chan);
2626         struct pl330_dmac *pl330;
2627         int burst;
2628
2629         if (unlikely(!pch || !len))
2630                 return NULL;
2631
2632         pl330 = pch->dmac;
2633
2634         desc = __pl330_prep_dma_memcpy(pch, dst, src, len);
2635         if (!desc)
2636                 return NULL;
2637
2638         desc->rqcfg.src_inc = 1;
2639         desc->rqcfg.dst_inc = 1;
2640         desc->rqtype = DMA_MEM_TO_MEM;
2641
2642         /* Select max possible burst size */
2643         burst = pl330->pcfg.data_bus_width / 8;
2644
2645         /*
2646          * Make sure we use a burst size that aligns with all the memcpy
2647          * parameters because our DMA programming algorithm doesn't cope with
2648          * transfers which straddle an entry in the DMA device's MFIFO.
2649          */
2650         while ((src | dst | len) & (burst - 1))
2651                 burst /= 2;
2652
2653         desc->rqcfg.brst_size = 0;
2654         while (burst != (1 << desc->rqcfg.brst_size))
2655                 desc->rqcfg.brst_size++;
2656
2657         /*
2658          * If burst size is smaller than bus width then make sure we only
2659          * transfer one at a time to avoid a burst stradling an MFIFO entry.
2660          */
2661         if (desc->rqcfg.brst_size * 8 < pl330->pcfg.data_bus_width)
2662                 desc->rqcfg.brst_len = 1;
2663
2664         desc->rqcfg.brst_len = get_burst_len(desc, len);
2665         desc->bytes_requested = len;
2666
2667         desc->txd.flags = flags;
2668
2669         return &desc->txd;
2670 }
2671
2672 static void __pl330_giveback_desc(struct pl330_dmac *pl330,
2673                                   struct dma_pl330_desc *first)
2674 {
2675         unsigned long flags;
2676         struct dma_pl330_desc *desc;
2677
2678         if (!first)
2679                 return;
2680
2681         spin_lock_irqsave(&pl330->pool_lock, flags);
2682
2683         while (!list_empty(&first->node)) {
2684                 desc = list_entry(first->node.next,
2685                                 struct dma_pl330_desc, node);
2686                 list_move_tail(&desc->node, &pl330->desc_pool);
2687         }
2688
2689         list_move_tail(&first->node, &pl330->desc_pool);
2690
2691         spin_unlock_irqrestore(&pl330->pool_lock, flags);
2692 }
2693
2694 static struct dma_async_tx_descriptor *
2695 pl330_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
2696                 unsigned int sg_len, enum dma_transfer_direction direction,
2697                 unsigned long flg, void *context)
2698 {
2699         struct dma_pl330_desc *first, *desc = NULL;
2700         struct dma_pl330_chan *pch = to_pchan(chan);
2701         struct scatterlist *sg;
2702         int i;
2703
2704         if (unlikely(!pch || !sgl || !sg_len))
2705                 return NULL;
2706
2707         if (!pl330_prep_slave_fifo(pch, direction))
2708                 return NULL;
2709
2710         first = NULL;
2711
2712         for_each_sg(sgl, sg, sg_len, i) {
2713
2714                 desc = pl330_get_desc(pch);
2715                 if (!desc) {
2716                         struct pl330_dmac *pl330 = pch->dmac;
2717
2718                         dev_err(pch->dmac->ddma.dev,
2719                                 "%s:%d Unable to fetch desc\n",
2720                                 __func__, __LINE__);
2721                         __pl330_giveback_desc(pl330, first);
2722
2723                         return NULL;
2724                 }
2725
2726                 if (!first)
2727                         first = desc;
2728                 else
2729                         list_add_tail(&desc->node, &first->node);
2730
2731                 if (direction == DMA_MEM_TO_DEV) {
2732                         desc->rqcfg.src_inc = 1;
2733                         desc->rqcfg.dst_inc = 0;
2734                         fill_px(&desc->px, pch->fifo_dma, sg_dma_address(sg),
2735                                 sg_dma_len(sg));
2736                 } else {
2737                         desc->rqcfg.src_inc = 0;
2738                         desc->rqcfg.dst_inc = 1;
2739                         fill_px(&desc->px, sg_dma_address(sg), pch->fifo_dma,
2740                                 sg_dma_len(sg));
2741                 }
2742
2743                 desc->rqcfg.brst_size = pch->burst_sz;
2744                 desc->rqcfg.brst_len = 1;
2745                 desc->rqtype = direction;
2746                 desc->bytes_requested = sg_dma_len(sg);
2747         }
2748
2749         /* Return the last desc in the chain */
2750         desc->txd.flags = flg;
2751         return &desc->txd;
2752 }
2753
2754 static irqreturn_t pl330_irq_handler(int irq, void *data)
2755 {
2756         if (pl330_update(data))
2757                 return IRQ_HANDLED;
2758         else
2759                 return IRQ_NONE;
2760 }
2761
2762 #define PL330_DMA_BUSWIDTHS \
2763         BIT(DMA_SLAVE_BUSWIDTH_UNDEFINED) | \
2764         BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \
2765         BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \
2766         BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) | \
2767         BIT(DMA_SLAVE_BUSWIDTH_8_BYTES)
2768
2769 /*
2770  * Runtime PM callbacks are provided by amba/bus.c driver.
2771  *
2772  * It is assumed here that IRQ safe runtime PM is chosen in probe and amba
2773  * bus driver will only disable/enable the clock in runtime PM callbacks.
2774  */
2775 static int __maybe_unused pl330_suspend(struct device *dev)
2776 {
2777         struct amba_device *pcdev = to_amba_device(dev);
2778
2779         pm_runtime_disable(dev);
2780
2781         if (!pm_runtime_status_suspended(dev)) {
2782                 /* amba did not disable the clock */
2783                 amba_pclk_disable(pcdev);
2784         }
2785         amba_pclk_unprepare(pcdev);
2786
2787         return 0;
2788 }
2789
2790 static int __maybe_unused pl330_resume(struct device *dev)
2791 {
2792         struct amba_device *pcdev = to_amba_device(dev);
2793         int ret;
2794
2795         ret = amba_pclk_prepare(pcdev);
2796         if (ret)
2797                 return ret;
2798
2799         if (!pm_runtime_status_suspended(dev))
2800                 ret = amba_pclk_enable(pcdev);
2801
2802         pm_runtime_enable(dev);
2803
2804         return ret;
2805 }
2806
2807 static SIMPLE_DEV_PM_OPS(pl330_pm, pl330_suspend, pl330_resume);
2808
2809 static int
2810 pl330_probe(struct amba_device *adev, const struct amba_id *id)
2811 {
2812         struct pl330_config *pcfg;
2813         struct pl330_dmac *pl330;
2814         struct dma_pl330_chan *pch, *_p;
2815         struct dma_device *pd;
2816         struct resource *res;
2817         int i, ret, irq;
2818         int num_chan;
2819         struct device_node *np = adev->dev.of_node;
2820
2821         ret = dma_set_mask_and_coherent(&adev->dev, DMA_BIT_MASK(32));
2822         if (ret)
2823                 return ret;
2824
2825         /* Allocate a new DMAC and its Channels */
2826         pl330 = devm_kzalloc(&adev->dev, sizeof(*pl330), GFP_KERNEL);
2827         if (!pl330)
2828                 return -ENOMEM;
2829
2830         pd = &pl330->ddma;
2831         pd->dev = &adev->dev;
2832
2833         pl330->mcbufsz = 0;
2834
2835         /* get quirk */
2836         for (i = 0; i < ARRAY_SIZE(of_quirks); i++)
2837                 if (of_property_read_bool(np, of_quirks[i].quirk))
2838                         pl330->quirks |= of_quirks[i].id;
2839
2840         res = &adev->res;
2841         pl330->base = devm_ioremap_resource(&adev->dev, res);
2842         if (IS_ERR(pl330->base))
2843                 return PTR_ERR(pl330->base);
2844
2845         amba_set_drvdata(adev, pl330);
2846
2847         for (i = 0; i < AMBA_NR_IRQS; i++) {
2848                 irq = adev->irq[i];
2849                 if (irq) {
2850                         ret = devm_request_irq(&adev->dev, irq,
2851                                                pl330_irq_handler, 0,
2852                                                dev_name(&adev->dev), pl330);
2853                         if (ret)
2854                                 return ret;
2855                 } else {
2856                         break;
2857                 }
2858         }
2859
2860         pcfg = &pl330->pcfg;
2861
2862         pcfg->periph_id = adev->periphid;
2863         ret = pl330_add(pl330);
2864         if (ret)
2865                 return ret;
2866
2867         INIT_LIST_HEAD(&pl330->desc_pool);
2868         spin_lock_init(&pl330->pool_lock);
2869
2870         /* Create a descriptor pool of default size */
2871         if (!add_desc(pl330, GFP_KERNEL, NR_DEFAULT_DESC))
2872                 dev_warn(&adev->dev, "unable to allocate desc\n");
2873
2874         INIT_LIST_HEAD(&pd->channels);
2875
2876         /* Initialize channel parameters */
2877         num_chan = max_t(int, pcfg->num_peri, pcfg->num_chan);
2878
2879         pl330->num_peripherals = num_chan;
2880
2881         pl330->peripherals = kzalloc(num_chan * sizeof(*pch), GFP_KERNEL);
2882         if (!pl330->peripherals) {
2883                 ret = -ENOMEM;
2884                 goto probe_err2;
2885         }
2886
2887         for (i = 0; i < num_chan; i++) {
2888                 pch = &pl330->peripherals[i];
2889
2890                 pch->chan.private = adev->dev.of_node;
2891                 INIT_LIST_HEAD(&pch->submitted_list);
2892                 INIT_LIST_HEAD(&pch->work_list);
2893                 INIT_LIST_HEAD(&pch->completed_list);
2894                 spin_lock_init(&pch->lock);
2895                 pch->thread = NULL;
2896                 pch->chan.device = pd;
2897                 pch->dmac = pl330;
2898                 pch->dir = DMA_NONE;
2899
2900                 /* Add the channel to the DMAC list */
2901                 list_add_tail(&pch->chan.device_node, &pd->channels);
2902         }
2903
2904         dma_cap_set(DMA_MEMCPY, pd->cap_mask);
2905         if (pcfg->num_peri) {
2906                 dma_cap_set(DMA_SLAVE, pd->cap_mask);
2907                 dma_cap_set(DMA_CYCLIC, pd->cap_mask);
2908                 dma_cap_set(DMA_PRIVATE, pd->cap_mask);
2909         }
2910
2911         pd->device_alloc_chan_resources = pl330_alloc_chan_resources;
2912         pd->device_free_chan_resources = pl330_free_chan_resources;
2913         pd->device_prep_dma_memcpy = pl330_prep_dma_memcpy;
2914         pd->device_prep_dma_cyclic = pl330_prep_dma_cyclic;
2915         pd->device_tx_status = pl330_tx_status;
2916         pd->device_prep_slave_sg = pl330_prep_slave_sg;
2917         pd->device_config = pl330_config;
2918         pd->device_pause = pl330_pause;
2919         pd->device_terminate_all = pl330_terminate_all;
2920         pd->device_issue_pending = pl330_issue_pending;
2921         pd->src_addr_widths = PL330_DMA_BUSWIDTHS;
2922         pd->dst_addr_widths = PL330_DMA_BUSWIDTHS;
2923         pd->directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
2924         pd->residue_granularity = DMA_RESIDUE_GRANULARITY_SEGMENT;
2925         pd->max_burst = ((pl330->quirks & PL330_QUIRK_BROKEN_NO_FLUSHP) ?
2926                          1 : PL330_MAX_BURST);
2927
2928         ret = dma_async_device_register(pd);
2929         if (ret) {
2930                 dev_err(&adev->dev, "unable to register DMAC\n");
2931                 goto probe_err3;
2932         }
2933
2934         if (adev->dev.of_node) {
2935                 ret = of_dma_controller_register(adev->dev.of_node,
2936                                          of_dma_pl330_xlate, pl330);
2937                 if (ret) {
2938                         dev_err(&adev->dev,
2939                         "unable to register DMA to the generic DT DMA helpers\n");
2940                 }
2941         }
2942
2943         adev->dev.dma_parms = &pl330->dma_parms;
2944
2945         /*
2946          * This is the limit for transfers with a buswidth of 1, larger
2947          * buswidths will have larger limits.
2948          */
2949         ret = dma_set_max_seg_size(&adev->dev, 1900800);
2950         if (ret)
2951                 dev_err(&adev->dev, "unable to set the seg size\n");
2952
2953
2954         dev_info(&adev->dev,
2955                 "Loaded driver for PL330 DMAC-%x\n", adev->periphid);
2956         dev_info(&adev->dev,
2957                 "\tDBUFF-%ux%ubytes Num_Chans-%u Num_Peri-%u Num_Events-%u\n",
2958                 pcfg->data_buf_dep, pcfg->data_bus_width / 8, pcfg->num_chan,
2959                 pcfg->num_peri, pcfg->num_events);
2960
2961         pm_runtime_irq_safe(&adev->dev);
2962         pm_runtime_use_autosuspend(&adev->dev);
2963         pm_runtime_set_autosuspend_delay(&adev->dev, PL330_AUTOSUSPEND_DELAY);
2964         pm_runtime_mark_last_busy(&adev->dev);
2965         pm_runtime_put_autosuspend(&adev->dev);
2966
2967         return 0;
2968 probe_err3:
2969         /* Idle the DMAC */
2970         list_for_each_entry_safe(pch, _p, &pl330->ddma.channels,
2971                         chan.device_node) {
2972
2973                 /* Remove the channel */
2974                 list_del(&pch->chan.device_node);
2975
2976                 /* Flush the channel */
2977                 if (pch->thread) {
2978                         pl330_terminate_all(&pch->chan);
2979                         pl330_free_chan_resources(&pch->chan);
2980                 }
2981         }
2982 probe_err2:
2983         pl330_del(pl330);
2984
2985         return ret;
2986 }
2987
2988 static int pl330_remove(struct amba_device *adev)
2989 {
2990         struct pl330_dmac *pl330 = amba_get_drvdata(adev);
2991         struct dma_pl330_chan *pch, *_p;
2992         int i, irq;
2993
2994         pm_runtime_get_noresume(pl330->ddma.dev);
2995
2996         if (adev->dev.of_node)
2997                 of_dma_controller_free(adev->dev.of_node);
2998
2999         for (i = 0; i < AMBA_NR_IRQS; i++) {
3000                 irq = adev->irq[i];
3001                 if (irq)
3002                         devm_free_irq(&adev->dev, irq, pl330);
3003         }
3004
3005         dma_async_device_unregister(&pl330->ddma);
3006
3007         /* Idle the DMAC */
3008         list_for_each_entry_safe(pch, _p, &pl330->ddma.channels,
3009                         chan.device_node) {
3010
3011                 /* Remove the channel */
3012                 list_del(&pch->chan.device_node);
3013
3014                 /* Flush the channel */
3015                 if (pch->thread) {
3016                         pl330_terminate_all(&pch->chan);
3017                         pl330_free_chan_resources(&pch->chan);
3018                 }
3019         }
3020
3021         pl330_del(pl330);
3022
3023         return 0;
3024 }
3025
3026 static const struct amba_id pl330_ids[] = {
3027         {
3028                 .id     = 0x00041330,
3029                 .mask   = 0x000fffff,
3030         },
3031         { 0, 0 },
3032 };
3033
3034 MODULE_DEVICE_TABLE(amba, pl330_ids);
3035
3036 static struct amba_driver pl330_driver = {
3037         .drv = {
3038                 .owner = THIS_MODULE,
3039                 .name = "dma-pl330",
3040                 .pm = &pl330_pm,
3041         },
3042         .id_table = pl330_ids,
3043         .probe = pl330_probe,
3044         .remove = pl330_remove,
3045 };
3046
3047 module_amba_driver(pl330_driver);
3048
3049 MODULE_AUTHOR("Jaswinder Singh <jassisinghbrar@gmail.com>");
3050 MODULE_DESCRIPTION("API Driver for PL330 DMAC");
3051 MODULE_LICENSE("GPL");