drivers/dma/xgene-dma.c

   1 /*
   2  * Applied Micro X-Gene SoC DMA engine Driver
   3  *
   4  * Copyright (c) 2015, Applied Micro Circuits Corporation
   5  * Authors: Rameshwar Prasad Sahu <rsahu@apm.com>
   6  *          Loc Ho <lho@apm.com>
   7  *
   8  * This program is free software; you can redistribute  it and/or modify it
   9  * under  the terms of  the GNU General  Public License as published by the
  10  * Free Software Foundation;  either version 2 of the  License, or (at your
  11  * option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20  *
  21  * NOTE: PM support is currently not available.
  22  */
  23
  24 #include <linux/acpi.h>
  25 #include <linux/clk.h>
  26 #include <linux/delay.h>
  27 #include <linux/dma-mapping.h>
  28 #include <linux/dmaengine.h>
  29 #include <linux/dmapool.h>
  30 #include <linux/interrupt.h>
  31 #include <linux/io.h>
  32 #include <linux/irq.h>
  33 #include <linux/module.h>
  34 #include <linux/of_device.h>
  35
  36 #include "dmaengine.h"
  37
  38 /* X-Gene DMA ring csr registers and bit definations */
  39 #define XGENE_DMA_RING_CONFIG                   0x04
  40 #define XGENE_DMA_RING_ENABLE                   BIT(31)
  41 #define XGENE_DMA_RING_ID                       0x08
  42 #define XGENE_DMA_RING_ID_SETUP(v)              ((v) | BIT(31))
  43 #define XGENE_DMA_RING_ID_BUF                   0x0C
  44 #define XGENE_DMA_RING_ID_BUF_SETUP(v)          (((v) << 9) | BIT(21))
  45 #define XGENE_DMA_RING_THRESLD0_SET1            0x30
  46 #define XGENE_DMA_RING_THRESLD0_SET1_VAL        0X64
  47 #define XGENE_DMA_RING_THRESLD1_SET1            0x34
  48 #define XGENE_DMA_RING_THRESLD1_SET1_VAL        0xC8
  49 #define XGENE_DMA_RING_HYSTERESIS               0x68
  50 #define XGENE_DMA_RING_HYSTERESIS_VAL           0xFFFFFFFF
  51 #define XGENE_DMA_RING_STATE                    0x6C
  52 #define XGENE_DMA_RING_STATE_WR_BASE            0x70
  53 #define XGENE_DMA_RING_NE_INT_MODE              0x017C
  54 #define XGENE_DMA_RING_NE_INT_MODE_SET(m, v)    \
  55         ((m) = ((m) & ~BIT(31 - (v))) | BIT(31 - (v)))
  56 #define XGENE_DMA_RING_NE_INT_MODE_RESET(m, v)  \
  57         ((m) &= (~BIT(31 - (v))))
  58 #define XGENE_DMA_RING_CLKEN                    0xC208
  59 #define XGENE_DMA_RING_SRST                     0xC200
  60 #define XGENE_DMA_RING_MEM_RAM_SHUTDOWN         0xD070
  61 #define XGENE_DMA_RING_BLK_MEM_RDY              0xD074
  62 #define XGENE_DMA_RING_BLK_MEM_RDY_VAL          0xFFFFFFFF
  63 #define XGENE_DMA_RING_ID_GET(owner, num)       (((owner) << 6) | (num))
  64 #define XGENE_DMA_RING_DST_ID(v)                ((1 << 10) | (v))
  65 #define XGENE_DMA_RING_CMD_OFFSET               0x2C
  66 #define XGENE_DMA_RING_CMD_BASE_OFFSET(v)       ((v) << 6)
  67 #define XGENE_DMA_RING_COHERENT_SET(m)          \
  68         (((u32 *)(m))[2] |= BIT(4))
  69 #define XGENE_DMA_RING_ADDRL_SET(m, v)          \
  70         (((u32 *)(m))[2] |= (((v) >> 8) << 5))
  71 #define XGENE_DMA_RING_ADDRH_SET(m, v)          \
  72         (((u32 *)(m))[3] |= ((v) >> 35))
  73 #define XGENE_DMA_RING_ACCEPTLERR_SET(m)        \
  74         (((u32 *)(m))[3] |= BIT(19))
  75 #define XGENE_DMA_RING_SIZE_SET(m, v)           \
  76         (((u32 *)(m))[3] |= ((v) << 23))
  77 #define XGENE_DMA_RING_RECOMBBUF_SET(m)         \
  78         (((u32 *)(m))[3] |= BIT(27))
  79 #define XGENE_DMA_RING_RECOMTIMEOUTL_SET(m)     \
  80         (((u32 *)(m))[3] |= (0x7 << 28))
  81 #define XGENE_DMA_RING_RECOMTIMEOUTH_SET(m)     \
  82         (((u32 *)(m))[4] |= 0x3)
  83 #define XGENE_DMA_RING_SELTHRSH_SET(m)          \
  84         (((u32 *)(m))[4] |= BIT(3))
  85 #define XGENE_DMA_RING_TYPE_SET(m, v)           \
  86         (((u32 *)(m))[4] |= ((v) << 19))
  87
  88 /* X-Gene DMA device csr registers and bit definitions */
  89 #define XGENE_DMA_IPBRR                         0x0
  90 #define XGENE_DMA_DEV_ID_RD(v)                  ((v) & 0x00000FFF)
  91 #define XGENE_DMA_BUS_ID_RD(v)                  (((v) >> 12) & 3)
  92 #define XGENE_DMA_REV_NO_RD(v)                  (((v) >> 14) & 3)
  93 #define XGENE_DMA_GCR                           0x10
  94 #define XGENE_DMA_CH_SETUP(v)                   \
  95         ((v) = ((v) & ~0x000FFFFF) | 0x000AAFFF)
  96 #define XGENE_DMA_ENABLE(v)                     ((v) |= BIT(31))
  97 #define XGENE_DMA_DISABLE(v)                    ((v) &= ~BIT(31))
  98 #define XGENE_DMA_RAID6_CONT                    0x14
  99 #define XGENE_DMA_RAID6_MULTI_CTRL(v)           ((v) << 24)
 100 #define XGENE_DMA_INT                           0x70
 101 #define XGENE_DMA_INT_MASK                      0x74
 102 #define XGENE_DMA_INT_ALL_MASK                  0xFFFFFFFF
 103 #define XGENE_DMA_INT_ALL_UNMASK                0x0
 104 #define XGENE_DMA_INT_MASK_SHIFT                0x14
 105 #define XGENE_DMA_RING_INT0_MASK                0x90A0
 106 #define XGENE_DMA_RING_INT1_MASK                0x90A8
 107 #define XGENE_DMA_RING_INT2_MASK                0x90B0
 108 #define XGENE_DMA_RING_INT3_MASK                0x90B8
 109 #define XGENE_DMA_RING_INT4_MASK                0x90C0
 110 #define XGENE_DMA_CFG_RING_WQ_ASSOC             0x90E0
 111 #define XGENE_DMA_ASSOC_RING_MNGR1              0xFFFFFFFF
 112 #define XGENE_DMA_MEM_RAM_SHUTDOWN              0xD070
 113 #define XGENE_DMA_BLK_MEM_RDY                   0xD074
 114 #define XGENE_DMA_BLK_MEM_RDY_VAL               0xFFFFFFFF
 115 #define XGENE_DMA_RING_CMD_SM_OFFSET            0x8000
 116
 117 /* X-Gene SoC EFUSE csr register and bit defination */
 118 #define XGENE_SOC_JTAG1_SHADOW                  0x18
 119 #define XGENE_DMA_PQ_DISABLE_MASK               BIT(13)
 120
 121 /* X-Gene DMA Descriptor format */
 122 #define XGENE_DMA_DESC_NV_BIT                   BIT_ULL(50)
 123 #define XGENE_DMA_DESC_IN_BIT                   BIT_ULL(55)
 124 #define XGENE_DMA_DESC_C_BIT                    BIT_ULL(63)
 125 #define XGENE_DMA_DESC_DR_BIT                   BIT_ULL(61)
 126 #define XGENE_DMA_DESC_ELERR_POS                46
 127 #define XGENE_DMA_DESC_RTYPE_POS                56
 128 #define XGENE_DMA_DESC_LERR_POS                 60
 129 #define XGENE_DMA_DESC_BUFLEN_POS               48
 130 #define XGENE_DMA_DESC_HOENQ_NUM_POS            48
 131 #define XGENE_DMA_DESC_ELERR_RD(m)              \
 132         (((m) >> XGENE_DMA_DESC_ELERR_POS) & 0x3)
 133 #define XGENE_DMA_DESC_LERR_RD(m)               \
 134         (((m) >> XGENE_DMA_DESC_LERR_POS) & 0x7)
 135 #define XGENE_DMA_DESC_STATUS(elerr, lerr)      \
 136         (((elerr) << 4) | (lerr))
 137
 138 /* X-Gene DMA descriptor empty s/w signature */
 139 #define XGENE_DMA_DESC_EMPTY_SIGNATURE          ~0ULL
 140
 141 /* X-Gene DMA configurable parameters defines */
 142 #define XGENE_DMA_RING_NUM              512
 143 #define XGENE_DMA_BUFNUM                0x0
 144 #define XGENE_DMA_CPU_BUFNUM            0x18
 145 #define XGENE_DMA_RING_OWNER_DMA        0x03
 146 #define XGENE_DMA_RING_OWNER_CPU        0x0F
 147 #define XGENE_DMA_RING_TYPE_REGULAR     0x01
 148 #define XGENE_DMA_RING_WQ_DESC_SIZE     32      /* 32 Bytes */
 149 #define XGENE_DMA_RING_NUM_CONFIG       5
 150 #define XGENE_DMA_MAX_CHANNEL           4
 151 #define XGENE_DMA_XOR_CHANNEL           0
 152 #define XGENE_DMA_PQ_CHANNEL            1
 153 #define XGENE_DMA_MAX_BYTE_CNT          0x4000  /* 16 KB */
 154 #define XGENE_DMA_MAX_64B_DESC_BYTE_CNT 0x14000 /* 80 KB */
 155 #define XGENE_DMA_MAX_XOR_SRC           5
 156 #define XGENE_DMA_16K_BUFFER_LEN_CODE   0x0
 157 #define XGENE_DMA_INVALID_LEN_CODE      0x7800000000000000ULL
 158
 159 /* X-Gene DMA descriptor error codes */
 160 #define ERR_DESC_AXI                    0x01
 161 #define ERR_BAD_DESC                    0x02
 162 #define ERR_READ_DATA_AXI               0x03
 163 #define ERR_WRITE_DATA_AXI              0x04
 164 #define ERR_FBP_TIMEOUT                 0x05
 165 #define ERR_ECC                         0x06
 166 #define ERR_DIFF_SIZE                   0x08
 167 #define ERR_SCT_GAT_LEN                 0x09
 168 #define ERR_CRC_ERR                     0x11
 169 #define ERR_CHKSUM                      0x12
 170 #define ERR_DIF                         0x13
 171
 172 /* X-Gene DMA error interrupt codes */
 173 #define ERR_DIF_SIZE_INT                0x0
 174 #define ERR_GS_ERR_INT                  0x1
 175 #define ERR_FPB_TIMEO_INT               0x2
 176 #define ERR_WFIFO_OVF_INT               0x3
 177 #define ERR_RFIFO_OVF_INT               0x4
 178 #define ERR_WR_TIMEO_INT                0x5
 179 #define ERR_RD_TIMEO_INT                0x6
 180 #define ERR_WR_ERR_INT                  0x7
 181 #define ERR_RD_ERR_INT                  0x8
 182 #define ERR_BAD_DESC_INT                0x9
 183 #define ERR_DESC_DST_INT                0xA
 184 #define ERR_DESC_SRC_INT                0xB
 185
 186 /* X-Gene DMA flyby operation code */
 187 #define FLYBY_2SRC_XOR                  0x80
 188 #define FLYBY_3SRC_XOR                  0x90
 189 #define FLYBY_4SRC_XOR                  0xA0
 190 #define FLYBY_5SRC_XOR                  0xB0
 191
 192 /* X-Gene DMA SW descriptor flags */
 193 #define XGENE_DMA_FLAG_64B_DESC         BIT(0)
 194
 195 /* Define to dump X-Gene DMA descriptor */
 196 #define XGENE_DMA_DESC_DUMP(desc, m)    \
 197         print_hex_dump(KERN_ERR, (m),   \
 198                         DUMP_PREFIX_ADDRESS, 16, 8, (desc), 32, 0)
 199
 200 #define to_dma_desc_sw(tx)              \
 201         container_of(tx, struct xgene_dma_desc_sw, tx)
 202 #define to_dma_chan(dchan)              \
 203         container_of(dchan, struct xgene_dma_chan, dma_chan)
 204
 205 #define chan_dbg(chan, fmt, arg...)     \
 206         dev_dbg(chan->dev, "%s: " fmt, chan->name, ##arg)
 207 #define chan_err(chan, fmt, arg...)     \
 208         dev_err(chan->dev, "%s: " fmt, chan->name, ##arg)
 209
 210 struct xgene_dma_desc_hw {
 211         __le64 m0;
 212         __le64 m1;
 213         __le64 m2;
 214         __le64 m3;
 215 };
 216
 217 enum xgene_dma_ring_cfgsize {
 218         XGENE_DMA_RING_CFG_SIZE_512B,
 219         XGENE_DMA_RING_CFG_SIZE_2KB,
 220         XGENE_DMA_RING_CFG_SIZE_16KB,
 221         XGENE_DMA_RING_CFG_SIZE_64KB,
 222         XGENE_DMA_RING_CFG_SIZE_512KB,
 223         XGENE_DMA_RING_CFG_SIZE_INVALID
 224 };
 225
 226 struct xgene_dma_ring {
 227         struct xgene_dma *pdma;
 228         u8 buf_num;
 229         u16 id;
 230         u16 num;
 231         u16 head;
 232         u16 owner;
 233         u16 slots;
 234         u16 dst_ring_num;
 235         u32 size;
 236         void __iomem *cmd;
 237         void __iomem *cmd_base;
 238         dma_addr_t desc_paddr;
 239         u32 state[XGENE_DMA_RING_NUM_CONFIG];
 240         enum xgene_dma_ring_cfgsize cfgsize;
 241         union {
 242                 void *desc_vaddr;
 243                 struct xgene_dma_desc_hw *desc_hw;
 244         };
 245 };
 246
 247 struct xgene_dma_desc_sw {
 248         struct xgene_dma_desc_hw desc1;
 249         struct xgene_dma_desc_hw desc2;
 250         u32 flags;
 251         struct list_head node;
 252         struct list_head tx_list;
 253         struct dma_async_tx_descriptor tx;
 254 };
 255
 256 /**
 257  * struct xgene_dma_chan - internal representation of an X-Gene DMA channel
 258  * @dma_chan: dmaengine channel object member
 259  * @pdma: X-Gene DMA device structure reference
 260  * @dev: struct device reference for dma mapping api
 261  * @id: raw id of this channel
 262  * @rx_irq: channel IRQ
 263  * @name: name of X-Gene DMA channel
 264  * @lock: serializes enqueue/dequeue operations to the descriptor pool
 265  * @pending: number of transaction request pushed to DMA controller for
 266  *      execution, but still waiting for completion,
 267  * @max_outstanding: max number of outstanding request we can push to channel
 268  * @ld_pending: descriptors which are queued to run, but have not yet been
 269  *      submitted to the hardware for execution
 270  * @ld_running: descriptors which are currently being executing by the hardware
 271  * @ld_completed: descriptors which have finished execution by the hardware.
 272  *      These descriptors have already had their cleanup actions run. They
 273  *      are waiting for the ACK bit to be set by the async tx API.
 274  * @desc_pool: descriptor pool for DMA operations
 275  * @tasklet: bottom half where all completed descriptors cleans
 276  * @tx_ring: transmit ring descriptor that we use to prepare actual
 277  *      descriptors for further executions
 278  * @rx_ring: receive ring descriptor that we use to get completed DMA
 279  *      descriptors during cleanup time
 280  */
 281 struct xgene_dma_chan {
 282         struct dma_chan dma_chan;
 283         struct xgene_dma *pdma;
 284         struct device *dev;
 285         int id;
 286         int rx_irq;
 287         char name[10];
 288         spinlock_t lock;
 289         int pending;
 290         int max_outstanding;
 291         struct list_head ld_pending;
 292         struct list_head ld_running;
 293         struct list_head ld_completed;
 294         struct dma_pool *desc_pool;
 295         struct tasklet_struct tasklet;
 296         struct xgene_dma_ring tx_ring;
 297         struct xgene_dma_ring rx_ring;
 298 };
 299
 300 /**
 301  * struct xgene_dma - internal representation of an X-Gene DMA device
 302  * @err_irq: DMA error irq number
 303  * @ring_num: start id number for DMA ring
 304  * @csr_dma: base for DMA register access
 305  * @csr_ring: base for DMA ring register access
 306  * @csr_ring_cmd: base for DMA ring command register access
 307  * @csr_efuse: base for efuse register access
 308  * @dma_dev: embedded struct dma_device
 309  * @chan: reference to X-Gene DMA channels
 310  */
 311 struct xgene_dma {
 312         struct device *dev;
 313         struct clk *clk;
 314         int err_irq;
 315         int ring_num;
 316         void __iomem *csr_dma;
 317         void __iomem *csr_ring;
 318         void __iomem *csr_ring_cmd;
 319         void __iomem *csr_efuse;
 320         struct dma_device dma_dev[XGENE_DMA_MAX_CHANNEL];
 321         struct xgene_dma_chan chan[XGENE_DMA_MAX_CHANNEL];
 322 };
 323
 324 static const char * const xgene_dma_desc_err[] = {
 325         [ERR_DESC_AXI] = "AXI error when reading src/dst link list",
 326         [ERR_BAD_DESC] = "ERR or El_ERR fields not set to zero in desc",
 327         [ERR_READ_DATA_AXI] = "AXI error when reading data",
 328         [ERR_WRITE_DATA_AXI] = "AXI error when writing data",
 329         [ERR_FBP_TIMEOUT] = "Timeout on bufpool fetch",
 330         [ERR_ECC] = "ECC double bit error",
 331         [ERR_DIFF_SIZE] = "Bufpool too small to hold all the DIF result",
 332         [ERR_SCT_GAT_LEN] = "Gather and scatter data length not same",
 333         [ERR_CRC_ERR] = "CRC error",
 334         [ERR_CHKSUM] = "Checksum error",
 335         [ERR_DIF] = "DIF error",
 336 };
 337
 338 static const char * const xgene_dma_err[] = {
 339         [ERR_DIF_SIZE_INT] = "DIF size error",
 340         [ERR_GS_ERR_INT] = "Gather scatter not same size error",
 341         [ERR_FPB_TIMEO_INT] = "Free pool time out error",
 342         [ERR_WFIFO_OVF_INT] = "Write FIFO over flow error",
 343         [ERR_RFIFO_OVF_INT] = "Read FIFO over flow error",
 344         [ERR_WR_TIMEO_INT] = "Write time out error",
 345         [ERR_RD_TIMEO_INT] = "Read time out error",
 346         [ERR_WR_ERR_INT] = "HBF bus write error",
 347         [ERR_RD_ERR_INT] = "HBF bus read error",
 348         [ERR_BAD_DESC_INT] = "Ring descriptor HE0 not set error",
 349         [ERR_DESC_DST_INT] = "HFB reading dst link address error",
 350         [ERR_DESC_SRC_INT] = "HFB reading src link address error",
 351 };
 352
 353 static bool is_pq_enabled(struct xgene_dma *pdma)
 354 {
 355         u32 val;
 356
 357         val = ioread32(pdma->csr_efuse + XGENE_SOC_JTAG1_SHADOW);
 358         return !(val & XGENE_DMA_PQ_DISABLE_MASK);
 359 }
 360
 361 static u64 xgene_dma_encode_len(size_t len)
 362 {
 363         return (len < XGENE_DMA_MAX_BYTE_CNT) ?
 364                 ((u64)len << XGENE_DMA_DESC_BUFLEN_POS) :
 365                 XGENE_DMA_16K_BUFFER_LEN_CODE;
 366 }
 367
 368 static u8 xgene_dma_encode_xor_flyby(u32 src_cnt)
 369 {
 370         static u8 flyby_type[] = {
 371                 FLYBY_2SRC_XOR, /* Dummy */
 372                 FLYBY_2SRC_XOR, /* Dummy */
 373                 FLYBY_2SRC_XOR,
 374                 FLYBY_3SRC_XOR,
 375                 FLYBY_4SRC_XOR,
 376                 FLYBY_5SRC_XOR
 377         };
 378
 379         return flyby_type[src_cnt];
 380 }
 381
 382 static void xgene_dma_set_src_buffer(__le64 *ext8, size_t *len,
 383                                      dma_addr_t *paddr)
 384 {
 385         size_t nbytes = (*len < XGENE_DMA_MAX_BYTE_CNT) ?
 386                         *len : XGENE_DMA_MAX_BYTE_CNT;
 387
 388         *ext8 |= cpu_to_le64(*paddr);
 389         *ext8 |= cpu_to_le64(xgene_dma_encode_len(nbytes));
 390         *len -= nbytes;
 391         *paddr += nbytes;
 392 }
 393
 394 static void xgene_dma_invalidate_buffer(__le64 *ext8)
 395 {
 396         *ext8 |= cpu_to_le64(XGENE_DMA_INVALID_LEN_CODE);
 397 }
 398
 399 static __le64 *xgene_dma_lookup_ext8(struct xgene_dma_desc_hw *desc, int idx)
 400 {
 401         switch (idx) {
 402         case 0:
 403                 return &desc->m1;
 404         case 1:
 405                 return &desc->m0;
 406         case 2:
 407                 return &desc->m3;
 408         case 3:
 409                 return &desc->m2;
 410         default:
 411                 pr_err("Invalid dma descriptor index\n");
 412         }
 413
 414         return NULL;
 415 }
 416
 417 static void xgene_dma_init_desc(struct xgene_dma_desc_hw *desc,
 418                                 u16 dst_ring_num)
 419 {
 420         desc->m0 |= cpu_to_le64(XGENE_DMA_DESC_IN_BIT);
 421         desc->m0 |= cpu_to_le64((u64)XGENE_DMA_RING_OWNER_DMA <<
 422                                 XGENE_DMA_DESC_RTYPE_POS);
 423         desc->m1 |= cpu_to_le64(XGENE_DMA_DESC_C_BIT);
 424         desc->m3 |= cpu_to_le64((u64)dst_ring_num <<
 425                                 XGENE_DMA_DESC_HOENQ_NUM_POS);
 426 }
 427
 428 static void xgene_dma_prep_cpy_desc(struct xgene_dma_chan *chan,
 429                                     struct xgene_dma_desc_sw *desc_sw,
 430                                     dma_addr_t dst, dma_addr_t src,
 431                                     size_t len)
 432 {
 433         struct xgene_dma_desc_hw *desc1, *desc2;
 434         int i;
 435
 436         /* Get 1st descriptor */
 437         desc1 = &desc_sw->desc1;
 438         xgene_dma_init_desc(desc1, chan->tx_ring.dst_ring_num);
 439
 440         /* Set destination address */
 441         desc1->m2 |= cpu_to_le64(XGENE_DMA_DESC_DR_BIT);
 442         desc1->m3 |= cpu_to_le64(dst);
 443
 444         /* Set 1st source address */
 445         xgene_dma_set_src_buffer(&desc1->m1, &len, &src);
 446
 447         if (!len)
 448                 return;
 449
 450         /*
 451          * We need to split this source buffer,
 452          * and need to use 2nd descriptor
 453          */
 454         desc2 = &desc_sw->desc2;
 455         desc1->m0 |= cpu_to_le64(XGENE_DMA_DESC_NV_BIT);
 456
 457         /* Set 2nd to 5th source address */
 458         for (i = 0; i < 4 && len; i++)
 459                 xgene_dma_set_src_buffer(xgene_dma_lookup_ext8(desc2, i),
 460                                          &len, &src);
 461
 462         /* Invalidate unused source address field */
 463         for (; i < 4; i++)
 464                 xgene_dma_invalidate_buffer(xgene_dma_lookup_ext8(desc2, i));
 465
 466         /* Updated flag that we have prepared 64B descriptor */
 467         desc_sw->flags |= XGENE_DMA_FLAG_64B_DESC;
 468 }
 469
 470 static void xgene_dma_prep_xor_desc(struct xgene_dma_chan *chan,
 471                                     struct xgene_dma_desc_sw *desc_sw,
 472                                     dma_addr_t *dst, dma_addr_t *src,
 473                                     u32 src_cnt, size_t *nbytes,
 474                                     const u8 *scf)
 475 {
 476         struct xgene_dma_desc_hw *desc1, *desc2;
 477         size_t len = *nbytes;
 478         int i;
 479
 480         desc1 = &desc_sw->desc1;
 481         desc2 = &desc_sw->desc2;
 482
 483         /* Initialize DMA descriptor */
 484         xgene_dma_init_desc(desc1, chan->tx_ring.dst_ring_num);
 485
 486         /* Set destination address */
 487         desc1->m2 |= cpu_to_le64(XGENE_DMA_DESC_DR_BIT);
 488         desc1->m3 |= cpu_to_le64(*dst);
 489
 490         /* We have multiple source addresses, so need to set NV bit*/
 491         desc1->m0 |= cpu_to_le64(XGENE_DMA_DESC_NV_BIT);
 492
 493         /* Set flyby opcode */
 494         desc1->m2 |= cpu_to_le64(xgene_dma_encode_xor_flyby(src_cnt));
 495
 496         /* Set 1st to 5th source addresses */
 497         for (i = 0; i < src_cnt; i++) {
 498                 len = *nbytes;
 499                 xgene_dma_set_src_buffer((i == 0) ? &desc1->m1 :
 500                                          xgene_dma_lookup_ext8(desc2, i - 1),
 501                                          &len, &src[i]);
 502                 desc1->m2 |= cpu_to_le64((scf[i] << ((i + 1) * 8)));
 503         }
 504
 505         /* Update meta data */
 506         *nbytes = len;
 507         *dst += XGENE_DMA_MAX_BYTE_CNT;
 508
 509         /* We need always 64B descriptor to perform xor or pq operations */
 510         desc_sw->flags |= XGENE_DMA_FLAG_64B_DESC;
 511 }
 512
 513 static dma_cookie_t xgene_dma_tx_submit(struct dma_async_tx_descriptor *tx)
 514 {
 515         struct xgene_dma_desc_sw *desc;
 516         struct xgene_dma_chan *chan;
 517         dma_cookie_t cookie;
 518
 519         if (unlikely(!tx))
 520                 return -EINVAL;
 521
 522         chan = to_dma_chan(tx->chan);
 523         desc = to_dma_desc_sw(tx);
 524
 525         spin_lock_bh(&chan->lock);
 526
 527         cookie = dma_cookie_assign(tx);
 528
 529         /* Add this transaction list onto the tail of the pending queue */
 530         list_splice_tail_init(&desc->tx_list, &chan->ld_pending);
 531
 532         spin_unlock_bh(&chan->lock);
 533
 534         return cookie;
 535 }
 536
 537 static void xgene_dma_clean_descriptor(struct xgene_dma_chan *chan,
 538                                        struct xgene_dma_desc_sw *desc)
 539 {
 540         list_del(&desc->node);
 541         chan_dbg(chan, "LD %p free\n", desc);
 542         dma_pool_free(chan->desc_pool, desc, desc->tx.phys);
 543 }
 544
 545 static struct xgene_dma_desc_sw *xgene_dma_alloc_descriptor(
 546                                  struct xgene_dma_chan *chan)
 547 {
 548         struct xgene_dma_desc_sw *desc;
 549         dma_addr_t phys;
 550
 551         desc = dma_pool_zalloc(chan->desc_pool, GFP_NOWAIT, &phys);
 552         if (!desc) {
 553                 chan_err(chan, "Failed to allocate LDs\n");
 554                 return NULL;
 555         }
 556
 557         INIT_LIST_HEAD(&desc->tx_list);
 558         desc->tx.phys = phys;
 559         desc->tx.tx_submit = xgene_dma_tx_submit;
 560         dma_async_tx_descriptor_init(&desc->tx, &chan->dma_chan);
 561
 562         chan_dbg(chan, "LD %p allocated\n", desc);
 563
 564         return desc;
 565 }
 566
 567 /**
 568  * xgene_dma_clean_completed_descriptor - free all descriptors which
 569  * has been completed and acked
 570  * @chan: X-Gene DMA channel
 571  *
 572  * This function is used on all completed and acked descriptors.
 573  */
 574 static void xgene_dma_clean_completed_descriptor(struct xgene_dma_chan *chan)
 575 {
 576         struct xgene_dma_desc_sw *desc, *_desc;
 577
 578         /* Run the callback for each descriptor, in order */
 579         list_for_each_entry_safe(desc, _desc, &chan->ld_completed, node) {
 580                 if (async_tx_test_ack(&desc->tx))
 581                         xgene_dma_clean_descriptor(chan, desc);
 582         }
 583 }
 584
 585 /**
 586  * xgene_dma_run_tx_complete_actions - cleanup a single link descriptor
 587  * @chan: X-Gene DMA channel
 588  * @desc: descriptor to cleanup and free
 589  *
 590  * This function is used on a descriptor which has been executed by the DMA
 591  * controller. It will run any callbacks, submit any dependencies.
 592  */
 593 static void xgene_dma_run_tx_complete_actions(struct xgene_dma_chan *chan,
 594                                               struct xgene_dma_desc_sw *desc)
 595 {
 596         struct dma_async_tx_descriptor *tx = &desc->tx;
 597
 598         /*
 599          * If this is not the last transaction in the group,
 600          * then no need to complete cookie and run any callback as
 601          * this is not the tx_descriptor which had been sent to caller
 602          * of this DMA request
 603          */
 604
 605         if (tx->cookie == 0)
 606                 return;
 607
 608         dma_cookie_complete(tx);
 609
 610         /* Run the link descriptor callback function */
 611         dmaengine_desc_get_callback_invoke(tx, NULL);
 612
 613         dma_descriptor_unmap(tx);
 614
 615         /* Run any dependencies */
 616         dma_run_dependencies(tx);
 617 }
 618
 619 /**
 620  * xgene_dma_clean_running_descriptor - move the completed descriptor from
 621  * ld_running to ld_completed
 622  * @chan: X-Gene DMA channel
 623  * @desc: the descriptor which is completed
 624  *
 625  * Free the descriptor directly if acked by async_tx api,
 626  * else move it to queue ld_completed.
 627  */
 628 static void xgene_dma_clean_running_descriptor(struct xgene_dma_chan *chan,
 629                                                struct xgene_dma_desc_sw *desc)
 630 {
 631         /* Remove from the list of running transactions */
 632         list_del(&desc->node);
 633
 634         /*
 635          * the client is allowed to attach dependent operations
 636          * until 'ack' is set
 637          */
 638         if (!async_tx_test_ack(&desc->tx)) {
 639                 /*
 640                  * Move this descriptor to the list of descriptors which is
 641                  * completed, but still awaiting the 'ack' bit to be set.
 642                  */
 643                 list_add_tail(&desc->node, &chan->ld_completed);
 644                 return;
 645         }
 646
 647         chan_dbg(chan, "LD %p free\n", desc);
 648         dma_pool_free(chan->desc_pool, desc, desc->tx.phys);
 649 }
 650
 651 static void xgene_chan_xfer_request(struct xgene_dma_chan *chan,
 652                                     struct xgene_dma_desc_sw *desc_sw)
 653 {
 654         struct xgene_dma_ring *ring = &chan->tx_ring;
 655         struct xgene_dma_desc_hw *desc_hw;
 656
 657         /* Get hw descriptor from DMA tx ring */
 658         desc_hw = &ring->desc_hw[ring->head];
 659
 660         /*
 661          * Increment the head count to point next
 662          * descriptor for next time
 663          */
 664         if (++ring->head == ring->slots)
 665                 ring->head = 0;
 666
 667         /* Copy prepared sw descriptor data to hw descriptor */
 668         memcpy(desc_hw, &desc_sw->desc1, sizeof(*desc_hw));
 669
 670         /*
 671          * Check if we have prepared 64B descriptor,
 672          * in this case we need one more hw descriptor
 673          */
 674         if (desc_sw->flags & XGENE_DMA_FLAG_64B_DESC) {
 675                 desc_hw = &ring->desc_hw[ring->head];
 676
 677                 if (++ring->head == ring->slots)
 678                         ring->head = 0;
 679
 680                 memcpy(desc_hw, &desc_sw->desc2, sizeof(*desc_hw));
 681         }
 682
 683         /* Increment the pending transaction count */
 684         chan->pending += ((desc_sw->flags &
 685                           XGENE_DMA_FLAG_64B_DESC) ? 2 : 1);
 686
 687         /* Notify the hw that we have descriptor ready for execution */
 688         iowrite32((desc_sw->flags & XGENE_DMA_FLAG_64B_DESC) ?
 689                   2 : 1, ring->cmd);
 690 }
 691
 692 /**
 693  * xgene_chan_xfer_ld_pending - push any pending transactions to hw
 694  * @chan : X-Gene DMA channel
 695  *
 696  * LOCKING: must hold chan->lock
 697  */
 698 static void xgene_chan_xfer_ld_pending(struct xgene_dma_chan *chan)
 699 {
 700         struct xgene_dma_desc_sw *desc_sw, *_desc_sw;
 701
 702         /*
 703          * If the list of pending descriptors is empty, then we
 704          * don't need to do any work at all
 705          */
 706         if (list_empty(&chan->ld_pending)) {
 707                 chan_dbg(chan, "No pending LDs\n");
 708                 return;
 709         }
 710
 711         /*
 712          * Move elements from the queue of pending transactions onto the list
 713          * of running transactions and push it to hw for further executions
 714          */
 715         list_for_each_entry_safe(desc_sw, _desc_sw, &chan->ld_pending, node) {
 716                 /*
 717                  * Check if have pushed max number of transactions to hw
 718                  * as capable, so let's stop here and will push remaining
 719                  * elements from pening ld queue after completing some
 720                  * descriptors that we have already pushed
 721                  */
 722                 if (chan->pending >= chan->max_outstanding)
 723                         return;
 724
 725                 xgene_chan_xfer_request(chan, desc_sw);
 726
 727                 /*
 728                  * Delete this element from ld pending queue and append it to
 729                  * ld running queue
 730                  */
 731                 list_move_tail(&desc_sw->node, &chan->ld_running);
 732         }
 733 }
 734
 735 /**
 736  * xgene_dma_cleanup_descriptors - cleanup link descriptors which are completed
 737  * and move them to ld_completed to free until flag 'ack' is set
 738  * @chan: X-Gene DMA channel
 739  *
 740  * This function is used on descriptors which have been executed by the DMA
 741  * controller. It will run any callbacks, submit any dependencies, then
 742  * free these descriptors if flag 'ack' is set.
 743  */
 744 static void xgene_dma_cleanup_descriptors(struct xgene_dma_chan *chan)
 745 {
 746         struct xgene_dma_ring *ring = &chan->rx_ring;
 747         struct xgene_dma_desc_sw *desc_sw, *_desc_sw;
 748         struct xgene_dma_desc_hw *desc_hw;
 749         struct list_head ld_completed;
 750         u8 status;
 751
 752         INIT_LIST_HEAD(&ld_completed);
 753
 754         spin_lock_bh(&chan->lock);
 755
 756         /* Clean already completed and acked descriptors */
 757         xgene_dma_clean_completed_descriptor(chan);
 758
 759         /* Move all completed descriptors to ld completed queue, in order */
 760         list_for_each_entry_safe(desc_sw, _desc_sw, &chan->ld_running, node) {
 761                 /* Get subsequent hw descriptor from DMA rx ring */
 762                 desc_hw = &ring->desc_hw[ring->head];
 763
 764                 /* Check if this descriptor has been completed */
 765                 if (unlikely(le64_to_cpu(desc_hw->m0) ==
 766                              XGENE_DMA_DESC_EMPTY_SIGNATURE))
 767                         break;
 768
 769                 if (++ring->head == ring->slots)
 770                         ring->head = 0;
 771
 772                 /* Check if we have any error with DMA transactions */
 773                 status = XGENE_DMA_DESC_STATUS(
 774                                 XGENE_DMA_DESC_ELERR_RD(le64_to_cpu(
 775                                                         desc_hw->m0)),
 776                                 XGENE_DMA_DESC_LERR_RD(le64_to_cpu(
 777                                                        desc_hw->m0)));
 778                 if (status) {
 779                         /* Print the DMA error type */
 780                         chan_err(chan, "%s\n", xgene_dma_desc_err[status]);
 781
 782                         /*
 783                          * We have DMA transactions error here. Dump DMA Tx
 784                          * and Rx descriptors for this request */
 785                         XGENE_DMA_DESC_DUMP(&desc_sw->desc1,
 786                                             "X-Gene DMA TX DESC1: ");
 787
 788                         if (desc_sw->flags & XGENE_DMA_FLAG_64B_DESC)
 789                                 XGENE_DMA_DESC_DUMP(&desc_sw->desc2,
 790                                                     "X-Gene DMA TX DESC2: ");
 791
 792                         XGENE_DMA_DESC_DUMP(desc_hw,
 793                                             "X-Gene DMA RX ERR DESC: ");
 794                 }
 795
 796                 /* Notify the hw about this completed descriptor */
 797                 iowrite32(-1, ring->cmd);
 798
 799                 /* Mark this hw descriptor as processed */
 800                 desc_hw->m0 = cpu_to_le64(XGENE_DMA_DESC_EMPTY_SIGNATURE);
 801
 802                 /*
 803                  * Decrement the pending transaction count
 804                  * as we have processed one
 805                  */
 806                 chan->pending -= ((desc_sw->flags &
 807                                   XGENE_DMA_FLAG_64B_DESC) ? 2 : 1);
 808
 809                 /*
 810                  * Delete this node from ld running queue and append it to
 811                  * ld completed queue for further processing
 812                  */
 813                 list_move_tail(&desc_sw->node, &ld_completed);
 814         }
 815
 816         /*
 817          * Start any pending transactions automatically
 818          * In the ideal case, we keep the DMA controller busy while we go
 819          * ahead and free the descriptors below.
 820          */
 821         xgene_chan_xfer_ld_pending(chan);
 822
 823         spin_unlock_bh(&chan->lock);
 824
 825         /* Run the callback for each descriptor, in order */
 826         list_for_each_entry_safe(desc_sw, _desc_sw, &ld_completed, node) {
 827                 xgene_dma_run_tx_complete_actions(chan, desc_sw);
 828                 xgene_dma_clean_running_descriptor(chan, desc_sw);
 829         }
 830 }
 831
 832 static int xgene_dma_alloc_chan_resources(struct dma_chan *dchan)
 833 {
 834         struct xgene_dma_chan *chan = to_dma_chan(dchan);
 835
 836         /* Has this channel already been allocated? */
 837         if (chan->desc_pool)
 838                 return 1;
 839
 840         chan->desc_pool = dma_pool_create(chan->name, chan->dev,
 841                                           sizeof(struct xgene_dma_desc_sw),
 842                                           0, 0);
 843         if (!chan->desc_pool) {
 844                 chan_err(chan, "Failed to allocate descriptor pool\n");
 845                 return -ENOMEM;
 846         }
 847
 848         chan_dbg(chan, "Allocate descripto pool\n");
 849
 850         return 1;
 851 }
 852
 853 /**
 854  * xgene_dma_free_desc_list - Free all descriptors in a queue
 855  * @chan: X-Gene DMA channel
 856  * @list: the list to free
 857  *
 858  * LOCKING: must hold chan->lock
 859  */
 860 static void xgene_dma_free_desc_list(struct xgene_dma_chan *chan,
 861                                      struct list_head *list)
 862 {
 863         struct xgene_dma_desc_sw *desc, *_desc;
 864
 865         list_for_each_entry_safe(desc, _desc, list, node)
 866                 xgene_dma_clean_descriptor(chan, desc);
 867 }
 868
 869 static void xgene_dma_free_chan_resources(struct dma_chan *dchan)
 870 {
 871         struct xgene_dma_chan *chan = to_dma_chan(dchan);
 872
 873         chan_dbg(chan, "Free all resources\n");
 874
 875         if (!chan->desc_pool)
 876                 return;
 877
 878         /* Process all running descriptor */
 879         xgene_dma_cleanup_descriptors(chan);
 880
 881         spin_lock_bh(&chan->lock);
 882
 883         /* Clean all link descriptor queues */
 884         xgene_dma_free_desc_list(chan, &chan->ld_pending);
 885         xgene_dma_free_desc_list(chan, &chan->ld_running);
 886         xgene_dma_free_desc_list(chan, &chan->ld_completed);
 887
 888         spin_unlock_bh(&chan->lock);
 889
 890         /* Delete this channel DMA pool */
 891         dma_pool_destroy(chan->desc_pool);
 892         chan->desc_pool = NULL;
 893 }
 894
 895 static struct dma_async_tx_descriptor *xgene_dma_prep_sg(
 896         struct dma_chan *dchan, struct scatterlist *dst_sg,
 897         u32 dst_nents, struct scatterlist *src_sg,
 898         u32 src_nents, unsigned long flags)
 899 {
 900         struct xgene_dma_desc_sw *first = NULL, *new = NULL;
 901         struct xgene_dma_chan *chan;
 902         size_t dst_avail, src_avail;
 903         dma_addr_t dst, src;
 904         size_t len;
 905
 906         if (unlikely(!dchan))
 907                 return NULL;
 908
 909         if (unlikely(!dst_nents || !src_nents))
 910                 return NULL;
 911
 912         if (unlikely(!dst_sg || !src_sg))
 913                 return NULL;
 914
 915         chan = to_dma_chan(dchan);
 916
 917         /* Get prepared for the loop */
 918         dst_avail = sg_dma_len(dst_sg);
 919         src_avail = sg_dma_len(src_sg);
 920         dst_nents--;
 921         src_nents--;
 922
 923         /* Run until we are out of scatterlist entries */
 924         while (true) {
 925                 /* Create the largest transaction possible */
 926                 len = min_t(size_t, src_avail, dst_avail);
 927                 len = min_t(size_t, len, XGENE_DMA_MAX_64B_DESC_BYTE_CNT);
 928                 if (len == 0)
 929                         goto fetch;
 930
 931                 dst = sg_dma_address(dst_sg) + sg_dma_len(dst_sg) - dst_avail;
 932                 src = sg_dma_address(src_sg) + sg_dma_len(src_sg) - src_avail;
 933
 934                 /* Allocate the link descriptor from DMA pool */
 935                 new = xgene_dma_alloc_descriptor(chan);
 936                 if (!new)
 937                         goto fail;
 938
 939                 /* Prepare DMA descriptor */
 940                 xgene_dma_prep_cpy_desc(chan, new, dst, src, len);
 941
 942                 if (!first)
 943                         first = new;
 944
 945                 new->tx.cookie = 0;
 946                 async_tx_ack(&new->tx);
 947
 948                 /* update metadata */
 949                 dst_avail -= len;
 950                 src_avail -= len;
 951
 952                 /* Insert the link descriptor to the LD ring */
 953                 list_add_tail(&new->node, &first->tx_list);
 954
 955 fetch:
 956                 /* fetch the next dst scatterlist entry */
 957                 if (dst_avail == 0) {
 958                         /* no more entries: we're done */
 959                         if (dst_nents == 0)
 960                                 break;
 961
 962                         /* fetch the next entry: if there are no more: done */
 963                         dst_sg = sg_next(dst_sg);
 964                         if (!dst_sg)
 965                                 break;
 966
 967                         dst_nents--;
 968                         dst_avail = sg_dma_len(dst_sg);
 969                 }
 970
 971                 /* fetch the next src scatterlist entry */
 972                 if (src_avail == 0) {
 973                         /* no more entries: we're done */
 974                         if (src_nents == 0)
 975                                 break;
 976
 977                         /* fetch the next entry: if there are no more: done */
 978                         src_sg = sg_next(src_sg);
 979                         if (!src_sg)
 980                                 break;
 981
 982                         src_nents--;
 983                         src_avail = sg_dma_len(src_sg);
 984                 }
 985         }
 986
 987         if (!new)
 988                 return NULL;
 989
 990         new->tx.flags = flags; /* client is in control of this ack */
 991         new->tx.cookie = -EBUSY;
 992         list_splice(&first->tx_list, &new->tx_list);
 993
 994         return &new->tx;
 995 fail:
 996         if (!first)
 997                 return NULL;
 998
 999         xgene_dma_free_desc_list(chan, &first->tx_list);
1000         return NULL;
1001 }
1002
1003 static struct dma_async_tx_descriptor *xgene_dma_prep_xor(
1004         struct dma_chan *dchan, dma_addr_t dst, dma_addr_t *src,
1005         u32 src_cnt, size_t len, unsigned long flags)
1006 {
1007         struct xgene_dma_desc_sw *first = NULL, *new;
1008         struct xgene_dma_chan *chan;
1009         static u8 multi[XGENE_DMA_MAX_XOR_SRC] = {
1010                                 0x01, 0x01, 0x01, 0x01, 0x01};
1011
1012         if (unlikely(!dchan || !len))
1013                 return NULL;
1014
1015         chan = to_dma_chan(dchan);
1016
1017         do {
1018                 /* Allocate the link descriptor from DMA pool */
1019                 new = xgene_dma_alloc_descriptor(chan);
1020                 if (!new)
1021                         goto fail;
1022
1023                 /* Prepare xor DMA descriptor */
1024                 xgene_dma_prep_xor_desc(chan, new, &dst, src,
1025                                         src_cnt, &len, multi);
1026
1027                 if (!first)
1028                         first = new;
1029
1030                 new->tx.cookie = 0;
1031                 async_tx_ack(&new->tx);
1032
1033                 /* Insert the link descriptor to the LD ring */
1034                 list_add_tail(&new->node, &first->tx_list);
1035         } while (len);
1036
1037         new->tx.flags = flags; /* client is in control of this ack */
1038         new->tx.cookie = -EBUSY;
1039         list_splice(&first->tx_list, &new->tx_list);
1040
1041         return &new->tx;
1042
1043 fail:
1044         if (!first)
1045                 return NULL;
1046
1047         xgene_dma_free_desc_list(chan, &first->tx_list);
1048         return NULL;
1049 }
1050
1051 static struct dma_async_tx_descriptor *xgene_dma_prep_pq(
1052         struct dma_chan *dchan, dma_addr_t *dst, dma_addr_t *src,
1053         u32 src_cnt, const u8 *scf, size_t len, unsigned long flags)
1054 {
1055         struct xgene_dma_desc_sw *first = NULL, *new;
1056         struct xgene_dma_chan *chan;
1057         size_t _len = len;
1058         dma_addr_t _src[XGENE_DMA_MAX_XOR_SRC];
1059         static u8 multi[XGENE_DMA_MAX_XOR_SRC] = {0x01, 0x01, 0x01, 0x01, 0x01};
1060
1061         if (unlikely(!dchan || !len))
1062                 return NULL;
1063
1064         chan = to_dma_chan(dchan);
1065
1066         /*
1067          * Save source addresses on local variable, may be we have to
1068          * prepare two descriptor to generate P and Q if both enabled
1069          * in the flags by client
1070          */
1071         memcpy(_src, src, sizeof(*src) * src_cnt);
1072
1073         if (flags & DMA_PREP_PQ_DISABLE_P)
1074                 len = 0;
1075
1076         if (flags & DMA_PREP_PQ_DISABLE_Q)
1077                 _len = 0;
1078
1079         do {
1080                 /* Allocate the link descriptor from DMA pool */
1081                 new = xgene_dma_alloc_descriptor(chan);
1082                 if (!new)
1083                         goto fail;
1084
1085                 if (!first)
1086                         first = new;
1087
1088                 new->tx.cookie = 0;
1089                 async_tx_ack(&new->tx);
1090
1091                 /* Insert the link descriptor to the LD ring */
1092                 list_add_tail(&new->node, &first->tx_list);
1093
1094                 /*
1095                  * Prepare DMA descriptor to generate P,
1096                  * if DMA_PREP_PQ_DISABLE_P flag is not set
1097                  */
1098                 if (len) {
1099                         xgene_dma_prep_xor_desc(chan, new, &dst[0], src,
1100                                                 src_cnt, &len, multi);
1101                         continue;
1102                 }
1103
1104                 /*
1105                  * Prepare DMA descriptor to generate Q,
1106                  * if DMA_PREP_PQ_DISABLE_Q flag is not set
1107                  */
1108                 if (_len) {
1109                         xgene_dma_prep_xor_desc(chan, new, &dst[1], _src,
1110                                                 src_cnt, &_len, scf);
1111                 }
1112         } while (len || _len);
1113
1114         new->tx.flags = flags; /* client is in control of this ack */
1115         new->tx.cookie = -EBUSY;
1116         list_splice(&first->tx_list, &new->tx_list);
1117
1118         return &new->tx;
1119
1120 fail:
1121         if (!first)
1122                 return NULL;
1123
1124         xgene_dma_free_desc_list(chan, &first->tx_list);
1125         return NULL;
1126 }
1127
1128 static void xgene_dma_issue_pending(struct dma_chan *dchan)
1129 {
1130         struct xgene_dma_chan *chan = to_dma_chan(dchan);
1131
1132         spin_lock_bh(&chan->lock);
1133         xgene_chan_xfer_ld_pending(chan);
1134         spin_unlock_bh(&chan->lock);
1135 }
1136
1137 static enum dma_status xgene_dma_tx_status(struct dma_chan *dchan,
1138                                            dma_cookie_t cookie,
1139                                            struct dma_tx_state *txstate)
1140 {
1141         return dma_cookie_status(dchan, cookie, txstate);
1142 }
1143
1144 static void xgene_dma_tasklet_cb(unsigned long data)
1145 {
1146         struct xgene_dma_chan *chan = (struct xgene_dma_chan *)data;
1147
1148         /* Run all cleanup for descriptors which have been completed */
1149         xgene_dma_cleanup_descriptors(chan);
1150
1151         /* Re-enable DMA channel IRQ */
1152         enable_irq(chan->rx_irq);
1153 }
1154
1155 static irqreturn_t xgene_dma_chan_ring_isr(int irq, void *id)
1156 {
1157         struct xgene_dma_chan *chan = (struct xgene_dma_chan *)id;
1158
1159         BUG_ON(!chan);
1160
1161         /*
1162          * Disable DMA channel IRQ until we process completed
1163          * descriptors
1164          */
1165         disable_irq_nosync(chan->rx_irq);
1166
1167         /*
1168          * Schedule the tasklet to handle all cleanup of the current
1169          * transaction. It will start a new transaction if there is
1170          * one pending.
1171          */
1172         tasklet_schedule(&chan->tasklet);
1173
1174         return IRQ_HANDLED;
1175 }
1176
1177 static irqreturn_t xgene_dma_err_isr(int irq, void *id)
1178 {
1179         struct xgene_dma *pdma = (struct xgene_dma *)id;
1180         unsigned long int_mask;
1181         u32 val, i;
1182
1183         val = ioread32(pdma->csr_dma + XGENE_DMA_INT);
1184
1185         /* Clear DMA interrupts */
1186         iowrite32(val, pdma->csr_dma + XGENE_DMA_INT);
1187
1188         /* Print DMA error info */
1189         int_mask = val >> XGENE_DMA_INT_MASK_SHIFT;
1190         for_each_set_bit(i, &int_mask, ARRAY_SIZE(xgene_dma_err))
1191                 dev_err(pdma->dev,
1192                         "Interrupt status 0x%08X %s\n", val, xgene_dma_err[i]);
1193
1194         return IRQ_HANDLED;
1195 }
1196
1197 static void xgene_dma_wr_ring_state(struct xgene_dma_ring *ring)
1198 {
1199         int i;
1200
1201         iowrite32(ring->num, ring->pdma->csr_ring + XGENE_DMA_RING_STATE);
1202
1203         for (i = 0; i < XGENE_DMA_RING_NUM_CONFIG; i++)
1204                 iowrite32(ring->state[i], ring->pdma->csr_ring +
1205                           XGENE_DMA_RING_STATE_WR_BASE + (i * 4));
1206 }
1207
1208 static void xgene_dma_clr_ring_state(struct xgene_dma_ring *ring)
1209 {
1210         memset(ring->state, 0, sizeof(u32) * XGENE_DMA_RING_NUM_CONFIG);
1211         xgene_dma_wr_ring_state(ring);
1212 }
1213
1214 static void xgene_dma_setup_ring(struct xgene_dma_ring *ring)
1215 {
1216         void *ring_cfg = ring->state;
1217         u64 addr = ring->desc_paddr;
1218         u32 i, val;
1219
1220         ring->slots = ring->size / XGENE_DMA_RING_WQ_DESC_SIZE;
1221
1222         /* Clear DMA ring state */
1223         xgene_dma_clr_ring_state(ring);
1224
1225         /* Set DMA ring type */
1226         XGENE_DMA_RING_TYPE_SET(ring_cfg, XGENE_DMA_RING_TYPE_REGULAR);
1227
1228         if (ring->owner == XGENE_DMA_RING_OWNER_DMA) {
1229                 /* Set recombination buffer and timeout */
1230                 XGENE_DMA_RING_RECOMBBUF_SET(ring_cfg);
1231                 XGENE_DMA_RING_RECOMTIMEOUTL_SET(ring_cfg);
1232                 XGENE_DMA_RING_RECOMTIMEOUTH_SET(ring_cfg);
1233         }
1234
1235         /* Initialize DMA ring state */
1236         XGENE_DMA_RING_SELTHRSH_SET(ring_cfg);
1237         XGENE_DMA_RING_ACCEPTLERR_SET(ring_cfg);
1238         XGENE_DMA_RING_COHERENT_SET(ring_cfg);
1239         XGENE_DMA_RING_ADDRL_SET(ring_cfg, addr);
1240         XGENE_DMA_RING_ADDRH_SET(ring_cfg, addr);
1241         XGENE_DMA_RING_SIZE_SET(ring_cfg, ring->cfgsize);
1242
1243         /* Write DMA ring configurations */
1244         xgene_dma_wr_ring_state(ring);
1245
1246         /* Set DMA ring id */
1247         iowrite32(XGENE_DMA_RING_ID_SETUP(ring->id),
1248                   ring->pdma->csr_ring + XGENE_DMA_RING_ID);
1249
1250         /* Set DMA ring buffer */
1251         iowrite32(XGENE_DMA_RING_ID_BUF_SETUP(ring->num),
1252                   ring->pdma->csr_ring + XGENE_DMA_RING_ID_BUF);
1253
1254         if (ring->owner != XGENE_DMA_RING_OWNER_CPU)
1255                 return;
1256
1257         /* Set empty signature to DMA Rx ring descriptors */
1258         for (i = 0; i < ring->slots; i++) {
1259                 struct xgene_dma_desc_hw *desc;
1260
1261                 desc = &ring->desc_hw[i];
1262                 desc->m0 = cpu_to_le64(XGENE_DMA_DESC_EMPTY_SIGNATURE);
1263         }
1264
1265         /* Enable DMA Rx ring interrupt */
1266         val = ioread32(ring->pdma->csr_ring + XGENE_DMA_RING_NE_INT_MODE);
1267         XGENE_DMA_RING_NE_INT_MODE_SET(val, ring->buf_num);
1268         iowrite32(val, ring->pdma->csr_ring + XGENE_DMA_RING_NE_INT_MODE);
1269 }
1270
1271 static void xgene_dma_clear_ring(struct xgene_dma_ring *ring)
1272 {
1273         u32 ring_id, val;
1274
1275         if (ring->owner == XGENE_DMA_RING_OWNER_CPU) {
1276                 /* Disable DMA Rx ring interrupt */
1277                 val = ioread32(ring->pdma->csr_ring +
1278                                XGENE_DMA_RING_NE_INT_MODE);
1279                 XGENE_DMA_RING_NE_INT_MODE_RESET(val, ring->buf_num);
1280                 iowrite32(val, ring->pdma->csr_ring +
1281                           XGENE_DMA_RING_NE_INT_MODE);
1282         }
1283
1284         /* Clear DMA ring state */
1285         ring_id = XGENE_DMA_RING_ID_SETUP(ring->id);
1286         iowrite32(ring_id, ring->pdma->csr_ring + XGENE_DMA_RING_ID);
1287
1288         iowrite32(0, ring->pdma->csr_ring + XGENE_DMA_RING_ID_BUF);
1289         xgene_dma_clr_ring_state(ring);
1290 }
1291
1292 static void xgene_dma_set_ring_cmd(struct xgene_dma_ring *ring)
1293 {
1294         ring->cmd_base = ring->pdma->csr_ring_cmd +
1295                                 XGENE_DMA_RING_CMD_BASE_OFFSET((ring->num -
1296                                                           XGENE_DMA_RING_NUM));
1297
1298         ring->cmd = ring->cmd_base + XGENE_DMA_RING_CMD_OFFSET;
1299 }
1300
1301 static int xgene_dma_get_ring_size(struct xgene_dma_chan *chan,
1302                                    enum xgene_dma_ring_cfgsize cfgsize)
1303 {
1304         int size;
1305
1306         switch (cfgsize) {
1307         case XGENE_DMA_RING_CFG_SIZE_512B:
1308                 size = 0x200;
1309                 break;
1310         case XGENE_DMA_RING_CFG_SIZE_2KB:
1311                 size = 0x800;
1312                 break;
1313         case XGENE_DMA_RING_CFG_SIZE_16KB:
1314                 size = 0x4000;
1315                 break;
1316         case XGENE_DMA_RING_CFG_SIZE_64KB:
1317                 size = 0x10000;
1318                 break;
1319         case XGENE_DMA_RING_CFG_SIZE_512KB:
1320                 size = 0x80000;
1321                 break;
1322         default:
1323                 chan_err(chan, "Unsupported cfg ring size %d\n", cfgsize);
1324                 return -EINVAL;
1325         }
1326
1327         return size;
1328 }
1329
1330 static void xgene_dma_delete_ring_one(struct xgene_dma_ring *ring)
1331 {
1332         /* Clear DMA ring configurations */
1333         xgene_dma_clear_ring(ring);
1334
1335         /* De-allocate DMA ring descriptor */
1336         if (ring->desc_vaddr) {
1337                 dma_free_coherent(ring->pdma->dev, ring->size,
1338                                   ring->desc_vaddr, ring->desc_paddr);
1339                 ring->desc_vaddr = NULL;
1340         }
1341 }
1342
1343 static void xgene_dma_delete_chan_rings(struct xgene_dma_chan *chan)
1344 {
1345         xgene_dma_delete_ring_one(&chan->rx_ring);
1346         xgene_dma_delete_ring_one(&chan->tx_ring);
1347 }
1348
1349 static int xgene_dma_create_ring_one(struct xgene_dma_chan *chan,
1350                                      struct xgene_dma_ring *ring,
1351                                      enum xgene_dma_ring_cfgsize cfgsize)
1352 {
1353         int ret;
1354
1355         /* Setup DMA ring descriptor variables */
1356         ring->pdma = chan->pdma;
1357         ring->cfgsize = cfgsize;
1358         ring->num = chan->pdma->ring_num++;
1359         ring->id = XGENE_DMA_RING_ID_GET(ring->owner, ring->buf_num);
1360
1361         ret = xgene_dma_get_ring_size(chan, cfgsize);
1362         if (ret <= 0)
1363                 return ret;
1364         ring->size = ret;
1365
1366         /* Allocate memory for DMA ring descriptor */
1367         ring->desc_vaddr = dma_zalloc_coherent(chan->dev, ring->size,
1368                                                &ring->desc_paddr, GFP_KERNEL);
1369         if (!ring->desc_vaddr) {
1370                 chan_err(chan, "Failed to allocate ring desc\n");
1371                 return -ENOMEM;
1372         }
1373
1374         /* Configure and enable DMA ring */
1375         xgene_dma_set_ring_cmd(ring);
1376         xgene_dma_setup_ring(ring);
1377
1378         return 0;
1379 }
1380
1381 static int xgene_dma_create_chan_rings(struct xgene_dma_chan *chan)
1382 {
1383         struct xgene_dma_ring *rx_ring = &chan->rx_ring;
1384         struct xgene_dma_ring *tx_ring = &chan->tx_ring;
1385         int ret;
1386
1387         /* Create DMA Rx ring descriptor */
1388         rx_ring->owner = XGENE_DMA_RING_OWNER_CPU;
1389         rx_ring->buf_num = XGENE_DMA_CPU_BUFNUM + chan->id;
1390
1391         ret = xgene_dma_create_ring_one(chan, rx_ring,
1392                                         XGENE_DMA_RING_CFG_SIZE_64KB);
1393         if (ret)
1394                 return ret;
1395
1396         chan_dbg(chan, "Rx ring id 0x%X num %d desc 0x%p\n",
1397                  rx_ring->id, rx_ring->num, rx_ring->desc_vaddr);
1398
1399         /* Create DMA Tx ring descriptor */
1400         tx_ring->owner = XGENE_DMA_RING_OWNER_DMA;
1401         tx_ring->buf_num = XGENE_DMA_BUFNUM + chan->id;
1402
1403         ret = xgene_dma_create_ring_one(chan, tx_ring,
1404                                         XGENE_DMA_RING_CFG_SIZE_64KB);
1405         if (ret) {
1406                 xgene_dma_delete_ring_one(rx_ring);
1407                 return ret;
1408         }
1409
1410         tx_ring->dst_ring_num = XGENE_DMA_RING_DST_ID(rx_ring->num);
1411
1412         chan_dbg(chan,
1413                  "Tx ring id 0x%X num %d desc 0x%p\n",
1414                  tx_ring->id, tx_ring->num, tx_ring->desc_vaddr);
1415
1416         /* Set the max outstanding request possible to this channel */
1417         chan->max_outstanding = tx_ring->slots;
1418
1419         return ret;
1420 }
1421
1422 static int xgene_dma_init_rings(struct xgene_dma *pdma)
1423 {
1424         int ret, i, j;
1425
1426         for (i = 0; i < XGENE_DMA_MAX_CHANNEL; i++) {
1427                 ret = xgene_dma_create_chan_rings(&pdma->chan[i]);
1428                 if (ret) {
1429                         for (j = 0; j < i; j++)
1430                                 xgene_dma_delete_chan_rings(&pdma->chan[j]);
1431                         return ret;
1432                 }
1433         }
1434
1435         return ret;
1436 }
1437
1438 static void xgene_dma_enable(struct xgene_dma *pdma)
1439 {
1440         u32 val;
1441
1442         /* Configure and enable DMA engine */
1443         val = ioread32(pdma->csr_dma + XGENE_DMA_GCR);
1444         XGENE_DMA_CH_SETUP(val);
1445         XGENE_DMA_ENABLE(val);
1446         iowrite32(val, pdma->csr_dma + XGENE_DMA_GCR);
1447 }
1448
1449 static void xgene_dma_disable(struct xgene_dma *pdma)
1450 {
1451         u32 val;
1452
1453         val = ioread32(pdma->csr_dma + XGENE_DMA_GCR);
1454         XGENE_DMA_DISABLE(val);
1455         iowrite32(val, pdma->csr_dma + XGENE_DMA_GCR);
1456 }
1457
1458 static void xgene_dma_mask_interrupts(struct xgene_dma *pdma)
1459 {
1460         /*
1461          * Mask DMA ring overflow, underflow and
1462          * AXI write/read error interrupts
1463          */
1464         iowrite32(XGENE_DMA_INT_ALL_MASK,
1465                   pdma->csr_dma + XGENE_DMA_RING_INT0_MASK);
1466         iowrite32(XGENE_DMA_INT_ALL_MASK,
1467                   pdma->csr_dma + XGENE_DMA_RING_INT1_MASK);
1468         iowrite32(XGENE_DMA_INT_ALL_MASK,
1469                   pdma->csr_dma + XGENE_DMA_RING_INT2_MASK);
1470         iowrite32(XGENE_DMA_INT_ALL_MASK,
1471                   pdma->csr_dma + XGENE_DMA_RING_INT3_MASK);
1472         iowrite32(XGENE_DMA_INT_ALL_MASK,
1473                   pdma->csr_dma + XGENE_DMA_RING_INT4_MASK);
1474
1475         /* Mask DMA error interrupts */
1476         iowrite32(XGENE_DMA_INT_ALL_MASK, pdma->csr_dma + XGENE_DMA_INT_MASK);
1477 }
1478
1479 static void xgene_dma_unmask_interrupts(struct xgene_dma *pdma)
1480 {
1481         /*
1482          * Unmask DMA ring overflow, underflow and
1483          * AXI write/read error interrupts
1484          */
1485         iowrite32(XGENE_DMA_INT_ALL_UNMASK,
1486                   pdma->csr_dma + XGENE_DMA_RING_INT0_MASK);
1487         iowrite32(XGENE_DMA_INT_ALL_UNMASK,
1488                   pdma->csr_dma + XGENE_DMA_RING_INT1_MASK);
1489         iowrite32(XGENE_DMA_INT_ALL_UNMASK,
1490                   pdma->csr_dma + XGENE_DMA_RING_INT2_MASK);
1491         iowrite32(XGENE_DMA_INT_ALL_UNMASK,
1492                   pdma->csr_dma + XGENE_DMA_RING_INT3_MASK);
1493         iowrite32(XGENE_DMA_INT_ALL_UNMASK,
1494                   pdma->csr_dma + XGENE_DMA_RING_INT4_MASK);
1495
1496         /* Unmask DMA error interrupts */
1497         iowrite32(XGENE_DMA_INT_ALL_UNMASK,
1498                   pdma->csr_dma + XGENE_DMA_INT_MASK);
1499 }
1500
1501 static void xgene_dma_init_hw(struct xgene_dma *pdma)
1502 {
1503         u32 val;
1504
1505         /* Associate DMA ring to corresponding ring HW */
1506         iowrite32(XGENE_DMA_ASSOC_RING_MNGR1,
1507                   pdma->csr_dma + XGENE_DMA_CFG_RING_WQ_ASSOC);
1508
1509         /* Configure RAID6 polynomial control setting */
1510         if (is_pq_enabled(pdma))
1511                 iowrite32(XGENE_DMA_RAID6_MULTI_CTRL(0x1D),
1512                           pdma->csr_dma + XGENE_DMA_RAID6_CONT);
1513         else
1514                 dev_info(pdma->dev, "PQ is disabled in HW\n");
1515
1516         xgene_dma_enable(pdma);
1517         xgene_dma_unmask_interrupts(pdma);
1518
1519         /* Get DMA id and version info */
1520         val = ioread32(pdma->csr_dma + XGENE_DMA_IPBRR);
1521
1522         /* DMA device info */
1523         dev_info(pdma->dev,
1524                  "X-Gene DMA v%d.%02d.%02d driver registered %d channels",
1525                  XGENE_DMA_REV_NO_RD(val), XGENE_DMA_BUS_ID_RD(val),
1526                  XGENE_DMA_DEV_ID_RD(val), XGENE_DMA_MAX_CHANNEL);
1527 }
1528
1529 static int xgene_dma_init_ring_mngr(struct xgene_dma *pdma)
1530 {
1531         if (ioread32(pdma->csr_ring + XGENE_DMA_RING_CLKEN) &&
1532             (!ioread32(pdma->csr_ring + XGENE_DMA_RING_SRST)))
1533                 return 0;
1534
1535         iowrite32(0x3, pdma->csr_ring + XGENE_DMA_RING_CLKEN);
1536         iowrite32(0x0, pdma->csr_ring + XGENE_DMA_RING_SRST);
1537
1538         /* Bring up memory */
1539         iowrite32(0x0, pdma->csr_ring + XGENE_DMA_RING_MEM_RAM_SHUTDOWN);
1540
1541         /* Force a barrier */
1542         ioread32(pdma->csr_ring + XGENE_DMA_RING_MEM_RAM_SHUTDOWN);
1543
1544         /* reset may take up to 1ms */
1545         usleep_range(1000, 1100);
1546
1547         if (ioread32(pdma->csr_ring + XGENE_DMA_RING_BLK_MEM_RDY)
1548                 != XGENE_DMA_RING_BLK_MEM_RDY_VAL) {
1549                 dev_err(pdma->dev,
1550                         "Failed to release ring mngr memory from shutdown\n");
1551                 return -ENODEV;
1552         }
1553
1554         /* program threshold set 1 and all hysteresis */
1555         iowrite32(XGENE_DMA_RING_THRESLD0_SET1_VAL,
1556                   pdma->csr_ring + XGENE_DMA_RING_THRESLD0_SET1);
1557         iowrite32(XGENE_DMA_RING_THRESLD1_SET1_VAL,
1558                   pdma->csr_ring + XGENE_DMA_RING_THRESLD1_SET1);
1559         iowrite32(XGENE_DMA_RING_HYSTERESIS_VAL,
1560                   pdma->csr_ring + XGENE_DMA_RING_HYSTERESIS);
1561
1562         /* Enable QPcore and assign error queue */
1563         iowrite32(XGENE_DMA_RING_ENABLE,
1564                   pdma->csr_ring + XGENE_DMA_RING_CONFIG);
1565
1566         return 0;
1567 }
1568
1569 static int xgene_dma_init_mem(struct xgene_dma *pdma)
1570 {
1571         int ret;
1572
1573         ret = xgene_dma_init_ring_mngr(pdma);
1574         if (ret)
1575                 return ret;
1576
1577         /* Bring up memory */
1578         iowrite32(0x0, pdma->csr_dma + XGENE_DMA_MEM_RAM_SHUTDOWN);
1579
1580         /* Force a barrier */
1581         ioread32(pdma->csr_dma + XGENE_DMA_MEM_RAM_SHUTDOWN);
1582
1583         /* reset may take up to 1ms */
1584         usleep_range(1000, 1100);
1585
1586         if (ioread32(pdma->csr_dma + XGENE_DMA_BLK_MEM_RDY)
1587                 != XGENE_DMA_BLK_MEM_RDY_VAL) {
1588                 dev_err(pdma->dev,
1589                         "Failed to release DMA memory from shutdown\n");
1590                 return -ENODEV;
1591         }
1592
1593         return 0;
1594 }
1595
1596 static int xgene_dma_request_irqs(struct xgene_dma *pdma)
1597 {
1598         struct xgene_dma_chan *chan;
1599         int ret, i, j;
1600
1601         /* Register DMA error irq */
1602         ret = devm_request_irq(pdma->dev, pdma->err_irq, xgene_dma_err_isr,
1603                                0, "dma_error", pdma);
1604         if (ret) {
1605                 dev_err(pdma->dev,
1606                         "Failed to register error IRQ %d\n", pdma->err_irq);
1607                 return ret;
1608         }
1609
1610         /* Register DMA channel rx irq */
1611         for (i = 0; i < XGENE_DMA_MAX_CHANNEL; i++) {
1612                 chan = &pdma->chan[i];
1613                 irq_set_status_flags(chan->rx_irq, IRQ_DISABLE_UNLAZY);
1614                 ret = devm_request_irq(chan->dev, chan->rx_irq,
1615                                        xgene_dma_chan_ring_isr,
1616                                        0, chan->name, chan);
1617                 if (ret) {
1618                         chan_err(chan, "Failed to register Rx IRQ %d\n",
1619                                  chan->rx_irq);
1620                         devm_free_irq(pdma->dev, pdma->err_irq, pdma);
1621
1622                         for (j = 0; j < i; j++) {
1623                                 chan = &pdma->chan[i];
1624                                 irq_clear_status_flags(chan->rx_irq, IRQ_DISABLE_UNLAZY);
1625                                 devm_free_irq(chan->dev, chan->rx_irq, chan);
1626                         }
1627
1628                         return ret;
1629                 }
1630         }
1631
1632         return 0;
1633 }
1634
1635 static void xgene_dma_free_irqs(struct xgene_dma *pdma)
1636 {
1637         struct xgene_dma_chan *chan;
1638         int i;
1639
1640         /* Free DMA device error irq */
1641         devm_free_irq(pdma->dev, pdma->err_irq, pdma);
1642
1643         for (i = 0; i < XGENE_DMA_MAX_CHANNEL; i++) {
1644                 chan = &pdma->chan[i];
1645                 irq_clear_status_flags(chan->rx_irq, IRQ_DISABLE_UNLAZY);
1646                 devm_free_irq(chan->dev, chan->rx_irq, chan);
1647         }
1648 }
1649
1650 static void xgene_dma_set_caps(struct xgene_dma_chan *chan,
1651                                struct dma_device *dma_dev)
1652 {
1653         /* Initialize DMA device capability mask */
1654         dma_cap_zero(dma_dev->cap_mask);
1655
1656         /* Set DMA device capability */
1657         dma_cap_set(DMA_SG, dma_dev->cap_mask);
1658
1659         /* Basically here, the X-Gene SoC DMA engine channel 0 supports XOR
1660          * and channel 1 supports XOR, PQ both. First thing here is we have
1661          * mechanism in hw to enable/disable PQ/XOR supports on channel 1,
1662          * we can make sure this by reading SoC Efuse register.
1663          * Second thing, we have hw errata that if we run channel 0 and
1664          * channel 1 simultaneously with executing XOR and PQ request,
1665          * suddenly DMA engine hangs, So here we enable XOR on channel 0 only
1666          * if XOR and PQ supports on channel 1 is disabled.
1667          */
1668         if ((chan->id == XGENE_DMA_PQ_CHANNEL) &&
1669             is_pq_enabled(chan->pdma)) {
1670                 dma_cap_set(DMA_PQ, dma_dev->cap_mask);
1671                 dma_cap_set(DMA_XOR, dma_dev->cap_mask);
1672         } else if ((chan->id == XGENE_DMA_XOR_CHANNEL) &&
1673                    !is_pq_enabled(chan->pdma)) {
1674                 dma_cap_set(DMA_XOR, dma_dev->cap_mask);
1675         }
1676
1677         /* Set base and prep routines */
1678         dma_dev->dev = chan->dev;
1679         dma_dev->device_alloc_chan_resources = xgene_dma_alloc_chan_resources;
1680         dma_dev->device_free_chan_resources = xgene_dma_free_chan_resources;
1681         dma_dev->device_issue_pending = xgene_dma_issue_pending;
1682         dma_dev->device_tx_status = xgene_dma_tx_status;
1683         dma_dev->device_prep_dma_sg = xgene_dma_prep_sg;
1684
1685         if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) {
1686                 dma_dev->device_prep_dma_xor = xgene_dma_prep_xor;
1687                 dma_dev->max_xor = XGENE_DMA_MAX_XOR_SRC;
1688                 dma_dev->xor_align = DMAENGINE_ALIGN_64_BYTES;
1689         }
1690
1691         if (dma_has_cap(DMA_PQ, dma_dev->cap_mask)) {
1692                 dma_dev->device_prep_dma_pq = xgene_dma_prep_pq;
1693                 dma_dev->max_pq = XGENE_DMA_MAX_XOR_SRC;
1694                 dma_dev->pq_align = DMAENGINE_ALIGN_64_BYTES;
1695         }
1696 }
1697
1698 static int xgene_dma_async_register(struct xgene_dma *pdma, int id)
1699 {
1700         struct xgene_dma_chan *chan = &pdma->chan[id];
1701         struct dma_device *dma_dev = &pdma->dma_dev[id];
1702         int ret;
1703
1704         chan->dma_chan.device = dma_dev;
1705
1706         spin_lock_init(&chan->lock);
1707         INIT_LIST_HEAD(&chan->ld_pending);
1708         INIT_LIST_HEAD(&chan->ld_running);
1709         INIT_LIST_HEAD(&chan->ld_completed);
1710         tasklet_init(&chan->tasklet, xgene_dma_tasklet_cb,
1711                      (unsigned long)chan);
1712
1713         chan->pending = 0;
1714         chan->desc_pool = NULL;
1715         dma_cookie_init(&chan->dma_chan);
1716
1717         /* Setup dma device capabilities and prep routines */
1718         xgene_dma_set_caps(chan, dma_dev);
1719
1720         /* Initialize DMA device list head */
1721         INIT_LIST_HEAD(&dma_dev->channels);
1722         list_add_tail(&chan->dma_chan.device_node, &dma_dev->channels);
1723
1724         /* Register with Linux async DMA framework*/
1725         ret = dma_async_device_register(dma_dev);
1726         if (ret) {
1727                 chan_err(chan, "Failed to register async device %d", ret);
1728                 tasklet_kill(&chan->tasklet);
1729
1730                 return ret;
1731         }
1732
1733         /* DMA capability info */
1734         dev_info(pdma->dev,
1735                  "%s: CAPABILITY ( %s%s%s)\n", dma_chan_name(&chan->dma_chan),
1736                  dma_has_cap(DMA_SG, dma_dev->cap_mask) ? "SGCPY " : "",
1737                  dma_has_cap(DMA_XOR, dma_dev->cap_mask) ? "XOR " : "",
1738                  dma_has_cap(DMA_PQ, dma_dev->cap_mask) ? "PQ " : "");
1739
1740         return 0;
1741 }
1742
1743 static int xgene_dma_init_async(struct xgene_dma *pdma)
1744 {
1745         int ret, i, j;
1746
1747         for (i = 0; i < XGENE_DMA_MAX_CHANNEL ; i++) {
1748                 ret = xgene_dma_async_register(pdma, i);
1749                 if (ret) {
1750                         for (j = 0; j < i; j++) {
1751                                 dma_async_device_unregister(&pdma->dma_dev[j]);
1752                                 tasklet_kill(&pdma->chan[j].tasklet);
1753                         }
1754
1755                         return ret;
1756                 }
1757         }
1758
1759         return ret;
1760 }
1761
1762 static void xgene_dma_async_unregister(struct xgene_dma *pdma)
1763 {
1764         int i;
1765
1766         for (i = 0; i < XGENE_DMA_MAX_CHANNEL; i++)
1767                 dma_async_device_unregister(&pdma->dma_dev[i]);
1768 }
1769
1770 static void xgene_dma_init_channels(struct xgene_dma *pdma)
1771 {
1772         struct xgene_dma_chan *chan;
1773         int i;
1774
1775         pdma->ring_num = XGENE_DMA_RING_NUM;
1776
1777         for (i = 0; i < XGENE_DMA_MAX_CHANNEL; i++) {
1778                 chan = &pdma->chan[i];
1779                 chan->dev = pdma->dev;
1780                 chan->pdma = pdma;
1781                 chan->id = i;
1782                 snprintf(chan->name, sizeof(chan->name), "dmachan%d", chan->id);
1783         }
1784 }
1785
1786 static int xgene_dma_get_resources(struct platform_device *pdev,
1787                                    struct xgene_dma *pdma)
1788 {
1789         struct resource *res;
1790         int irq, i;
1791
1792         /* Get DMA csr region */
1793         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1794         if (!res) {
1795                 dev_err(&pdev->dev, "Failed to get csr region\n");
1796                 return -ENXIO;
1797         }
1798
1799         pdma->csr_dma = devm_ioremap(&pdev->dev, res->start,
1800                                      resource_size(res));
1801         if (!pdma->csr_dma) {
1802                 dev_err(&pdev->dev, "Failed to ioremap csr region");
1803                 return -ENOMEM;
1804         }
1805
1806         /* Get DMA ring csr region */
1807         res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1808         if (!res) {
1809                 dev_err(&pdev->dev, "Failed to get ring csr region\n");
1810                 return -ENXIO;
1811         }
1812
1813         pdma->csr_ring =  devm_ioremap(&pdev->dev, res->start,
1814                                        resource_size(res));
1815         if (!pdma->csr_ring) {
1816                 dev_err(&pdev->dev, "Failed to ioremap ring csr region");
1817                 return -ENOMEM;
1818         }
1819
1820         /* Get DMA ring cmd csr region */
1821         res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
1822         if (!res) {
1823                 dev_err(&pdev->dev, "Failed to get ring cmd csr region\n");
1824                 return -ENXIO;
1825         }
1826
1827         pdma->csr_ring_cmd = devm_ioremap(&pdev->dev, res->start,
1828                                           resource_size(res));
1829         if (!pdma->csr_ring_cmd) {
1830                 dev_err(&pdev->dev, "Failed to ioremap ring cmd csr region");
1831                 return -ENOMEM;
1832         }
1833
1834         pdma->csr_ring_cmd += XGENE_DMA_RING_CMD_SM_OFFSET;
1835
1836         /* Get efuse csr region */
1837         res = platform_get_resource(pdev, IORESOURCE_MEM, 3);
1838         if (!res) {
1839                 dev_err(&pdev->dev, "Failed to get efuse csr region\n");
1840                 return -ENXIO;
1841         }
1842
1843         pdma->csr_efuse = devm_ioremap(&pdev->dev, res->start,
1844                                        resource_size(res));
1845         if (!pdma->csr_efuse) {
1846                 dev_err(&pdev->dev, "Failed to ioremap efuse csr region");
1847                 return -ENOMEM;
1848         }
1849
1850         /* Get DMA error interrupt */
1851         irq = platform_get_irq(pdev, 0);
1852         if (irq <= 0) {
1853                 dev_err(&pdev->dev, "Failed to get Error IRQ\n");
1854                 return -ENXIO;
1855         }
1856
1857         pdma->err_irq = irq;
1858
1859         /* Get DMA Rx ring descriptor interrupts for all DMA channels */
1860         for (i = 1; i <= XGENE_DMA_MAX_CHANNEL; i++) {
1861                 irq = platform_get_irq(pdev, i);
1862                 if (irq <= 0) {
1863                         dev_err(&pdev->dev, "Failed to get Rx IRQ\n");
1864                         return -ENXIO;
1865                 }
1866
1867                 pdma->chan[i - 1].rx_irq = irq;
1868         }
1869
1870         return 0;
1871 }
1872
1873 static int xgene_dma_probe(struct platform_device *pdev)
1874 {
1875         struct xgene_dma *pdma;
1876         int ret, i;
1877
1878         pdma = devm_kzalloc(&pdev->dev, sizeof(*pdma), GFP_KERNEL);
1879         if (!pdma)
1880                 return -ENOMEM;
1881
1882         pdma->dev = &pdev->dev;
1883         platform_set_drvdata(pdev, pdma);
1884
1885         ret = xgene_dma_get_resources(pdev, pdma);
1886         if (ret)
1887                 return ret;
1888
1889         pdma->clk = devm_clk_get(&pdev->dev, NULL);
1890         if (IS_ERR(pdma->clk) && !ACPI_COMPANION(&pdev->dev)) {
1891                 dev_err(&pdev->dev, "Failed to get clk\n");
1892                 return PTR_ERR(pdma->clk);
1893         }
1894
1895         /* Enable clk before accessing registers */
1896         if (!IS_ERR(pdma->clk)) {
1897                 ret = clk_prepare_enable(pdma->clk);
1898                 if (ret) {
1899                         dev_err(&pdev->dev, "Failed to enable clk %d\n", ret);
1900                         return ret;
1901                 }
1902         }
1903
1904         /* Remove DMA RAM out of shutdown */
1905         ret = xgene_dma_init_mem(pdma);
1906         if (ret)
1907                 goto err_clk_enable;
1908
1909         ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(42));
1910         if (ret) {
1911                 dev_err(&pdev->dev, "No usable DMA configuration\n");
1912                 goto err_dma_mask;
1913         }
1914
1915         /* Initialize DMA channels software state */
1916         xgene_dma_init_channels(pdma);
1917
1918         /* Configue DMA rings */
1919         ret = xgene_dma_init_rings(pdma);
1920         if (ret)
1921                 goto err_clk_enable;
1922
1923         ret = xgene_dma_request_irqs(pdma);
1924         if (ret)
1925                 goto err_request_irq;
1926
1927         /* Configure and enable DMA engine */
1928         xgene_dma_init_hw(pdma);
1929
1930         /* Register DMA device with linux async framework */
1931         ret = xgene_dma_init_async(pdma);
1932         if (ret)
1933                 goto err_async_init;
1934
1935         return 0;
1936
1937 err_async_init:
1938         xgene_dma_free_irqs(pdma);
1939
1940 err_request_irq:
1941         for (i = 0; i < XGENE_DMA_MAX_CHANNEL; i++)
1942                 xgene_dma_delete_chan_rings(&pdma->chan[i]);
1943
1944 err_dma_mask:
1945 err_clk_enable:
1946         if (!IS_ERR(pdma->clk))
1947                 clk_disable_unprepare(pdma->clk);
1948
1949         return ret;
1950 }
1951
1952 static int xgene_dma_remove(struct platform_device *pdev)
1953 {
1954         struct xgene_dma *pdma = platform_get_drvdata(pdev);
1955         struct xgene_dma_chan *chan;
1956         int i;
1957
1958         xgene_dma_async_unregister(pdma);
1959
1960         /* Mask interrupts and disable DMA engine */
1961         xgene_dma_mask_interrupts(pdma);
1962         xgene_dma_disable(pdma);
1963         xgene_dma_free_irqs(pdma);
1964
1965         for (i = 0; i < XGENE_DMA_MAX_CHANNEL; i++) {
1966                 chan = &pdma->chan[i];
1967                 tasklet_kill(&chan->tasklet);
1968                 xgene_dma_delete_chan_rings(chan);
1969         }
1970
1971         if (!IS_ERR(pdma->clk))
1972                 clk_disable_unprepare(pdma->clk);
1973
1974         return 0;
1975 }
1976
1977 #ifdef CONFIG_ACPI
1978 static const struct acpi_device_id xgene_dma_acpi_match_ptr[] = {
1979         {"APMC0D43", 0},
1980         {},
1981 };
1982 MODULE_DEVICE_TABLE(acpi, xgene_dma_acpi_match_ptr);
1983 #endif
1984
1985 static const struct of_device_id xgene_dma_of_match_ptr[] = {
1986         {.compatible = "apm,xgene-storm-dma",},
1987         {},
1988 };
1989 MODULE_DEVICE_TABLE(of, xgene_dma_of_match_ptr);
1990
1991 static struct platform_driver xgene_dma_driver = {
1992         .probe = xgene_dma_probe,
1993         .remove = xgene_dma_remove,
1994         .driver = {
1995                 .name = "X-Gene-DMA",
1996                 .of_match_table = xgene_dma_of_match_ptr,
1997                 .acpi_match_table = ACPI_PTR(xgene_dma_acpi_match_ptr),
1998         },
1999 };
2000
2001 module_platform_driver(xgene_dma_driver);
2002
2003 MODULE_DESCRIPTION("APM X-Gene SoC DMA driver");
2004 MODULE_AUTHOR("Rameshwar Prasad Sahu <rsahu@apm.com>");
2005 MODULE_AUTHOR("Loc Ho <lho@apm.com>");
2006 MODULE_LICENSE("GPL");
2007 MODULE_VERSION("1.0");