drivers/dma/xgene-dma.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Applied Micro X-Gene SoC DMA engine Driver
   4  *
   5  * Copyright (c) 2015, Applied Micro Circuits Corporation
   6  * Authors: Rameshwar Prasad Sahu <rsahu@apm.com>
   7  *          Loc Ho <lho@apm.com>
   8  *
   9  * NOTE: PM support is currently not available.
  10  */
  11
  12 #include <linux/acpi.h>
  13 #include <linux/clk.h>
  14 #include <linux/delay.h>
  15 #include <linux/dma-mapping.h>
  16 #include <linux/dmaengine.h>
  17 #include <linux/dmapool.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/io.h>
  20 #include <linux/irq.h>
  21 #include <linux/module.h>
  22 #include <linux/of_device.h>
  23
  24 #include "dmaengine.h"
  25
  26 /* X-Gene DMA ring csr registers and bit definations */
  27 #define XGENE_DMA_RING_CONFIG                   0x04
  28 #define XGENE_DMA_RING_ENABLE                   BIT(31)
  29 #define XGENE_DMA_RING_ID                       0x08
  30 #define XGENE_DMA_RING_ID_SETUP(v)              ((v) | BIT(31))
  31 #define XGENE_DMA_RING_ID_BUF                   0x0C
  32 #define XGENE_DMA_RING_ID_BUF_SETUP(v)          (((v) << 9) | BIT(21))
  33 #define XGENE_DMA_RING_THRESLD0_SET1            0x30
  34 #define XGENE_DMA_RING_THRESLD0_SET1_VAL        0X64
  35 #define XGENE_DMA_RING_THRESLD1_SET1            0x34
  36 #define XGENE_DMA_RING_THRESLD1_SET1_VAL        0xC8
  37 #define XGENE_DMA_RING_HYSTERESIS               0x68
  38 #define XGENE_DMA_RING_HYSTERESIS_VAL           0xFFFFFFFF
  39 #define XGENE_DMA_RING_STATE                    0x6C
  40 #define XGENE_DMA_RING_STATE_WR_BASE            0x70
  41 #define XGENE_DMA_RING_NE_INT_MODE              0x017C
  42 #define XGENE_DMA_RING_NE_INT_MODE_SET(m, v)    \
  43         ((m) = ((m) & ~BIT(31 - (v))) | BIT(31 - (v)))
  44 #define XGENE_DMA_RING_NE_INT_MODE_RESET(m, v)  \
  45         ((m) &= (~BIT(31 - (v))))
  46 #define XGENE_DMA_RING_CLKEN                    0xC208
  47 #define XGENE_DMA_RING_SRST                     0xC200
  48 #define XGENE_DMA_RING_MEM_RAM_SHUTDOWN         0xD070
  49 #define XGENE_DMA_RING_BLK_MEM_RDY              0xD074
  50 #define XGENE_DMA_RING_BLK_MEM_RDY_VAL          0xFFFFFFFF
  51 #define XGENE_DMA_RING_ID_GET(owner, num)       (((owner) << 6) | (num))
  52 #define XGENE_DMA_RING_DST_ID(v)                ((1 << 10) | (v))
  53 #define XGENE_DMA_RING_CMD_OFFSET               0x2C
  54 #define XGENE_DMA_RING_CMD_BASE_OFFSET(v)       ((v) << 6)
  55 #define XGENE_DMA_RING_COHERENT_SET(m)          \
  56         (((u32 *)(m))[2] |= BIT(4))
  57 #define XGENE_DMA_RING_ADDRL_SET(m, v)          \
  58         (((u32 *)(m))[2] |= (((v) >> 8) << 5))
  59 #define XGENE_DMA_RING_ADDRH_SET(m, v)          \
  60         (((u32 *)(m))[3] |= ((v) >> 35))
  61 #define XGENE_DMA_RING_ACCEPTLERR_SET(m)        \
  62         (((u32 *)(m))[3] |= BIT(19))
  63 #define XGENE_DMA_RING_SIZE_SET(m, v)           \
  64         (((u32 *)(m))[3] |= ((v) << 23))
  65 #define XGENE_DMA_RING_RECOMBBUF_SET(m)         \
  66         (((u32 *)(m))[3] |= BIT(27))
  67 #define XGENE_DMA_RING_RECOMTIMEOUTL_SET(m)     \
  68         (((u32 *)(m))[3] |= (0x7 << 28))
  69 #define XGENE_DMA_RING_RECOMTIMEOUTH_SET(m)     \
  70         (((u32 *)(m))[4] |= 0x3)
  71 #define XGENE_DMA_RING_SELTHRSH_SET(m)          \
  72         (((u32 *)(m))[4] |= BIT(3))
  73 #define XGENE_DMA_RING_TYPE_SET(m, v)           \
  74         (((u32 *)(m))[4] |= ((v) << 19))
  75
  76 /* X-Gene DMA device csr registers and bit definitions */
  77 #define XGENE_DMA_IPBRR                         0x0
  78 #define XGENE_DMA_DEV_ID_RD(v)                  ((v) & 0x00000FFF)
  79 #define XGENE_DMA_BUS_ID_RD(v)                  (((v) >> 12) & 3)
  80 #define XGENE_DMA_REV_NO_RD(v)                  (((v) >> 14) & 3)
  81 #define XGENE_DMA_GCR                           0x10
  82 #define XGENE_DMA_CH_SETUP(v)                   \
  83         ((v) = ((v) & ~0x000FFFFF) | 0x000AAFFF)
  84 #define XGENE_DMA_ENABLE(v)                     ((v) |= BIT(31))
  85 #define XGENE_DMA_DISABLE(v)                    ((v) &= ~BIT(31))
  86 #define XGENE_DMA_RAID6_CONT                    0x14
  87 #define XGENE_DMA_RAID6_MULTI_CTRL(v)           ((v) << 24)
  88 #define XGENE_DMA_INT                           0x70
  89 #define XGENE_DMA_INT_MASK                      0x74
  90 #define XGENE_DMA_INT_ALL_MASK                  0xFFFFFFFF
  91 #define XGENE_DMA_INT_ALL_UNMASK                0x0
  92 #define XGENE_DMA_INT_MASK_SHIFT                0x14
  93 #define XGENE_DMA_RING_INT0_MASK                0x90A0
  94 #define XGENE_DMA_RING_INT1_MASK                0x90A8
  95 #define XGENE_DMA_RING_INT2_MASK                0x90B0
  96 #define XGENE_DMA_RING_INT3_MASK                0x90B8
  97 #define XGENE_DMA_RING_INT4_MASK                0x90C0
  98 #define XGENE_DMA_CFG_RING_WQ_ASSOC             0x90E0
  99 #define XGENE_DMA_ASSOC_RING_MNGR1              0xFFFFFFFF
 100 #define XGENE_DMA_MEM_RAM_SHUTDOWN              0xD070
 101 #define XGENE_DMA_BLK_MEM_RDY                   0xD074
 102 #define XGENE_DMA_BLK_MEM_RDY_VAL               0xFFFFFFFF
 103 #define XGENE_DMA_RING_CMD_SM_OFFSET            0x8000
 104
 105 /* X-Gene SoC EFUSE csr register and bit defination */
 106 #define XGENE_SOC_JTAG1_SHADOW                  0x18
 107 #define XGENE_DMA_PQ_DISABLE_MASK               BIT(13)
 108
 109 /* X-Gene DMA Descriptor format */
 110 #define XGENE_DMA_DESC_NV_BIT                   BIT_ULL(50)
 111 #define XGENE_DMA_DESC_IN_BIT                   BIT_ULL(55)
 112 #define XGENE_DMA_DESC_C_BIT                    BIT_ULL(63)
 113 #define XGENE_DMA_DESC_DR_BIT                   BIT_ULL(61)
 114 #define XGENE_DMA_DESC_ELERR_POS                46
 115 #define XGENE_DMA_DESC_RTYPE_POS                56
 116 #define XGENE_DMA_DESC_LERR_POS                 60
 117 #define XGENE_DMA_DESC_BUFLEN_POS               48
 118 #define XGENE_DMA_DESC_HOENQ_NUM_POS            48
 119 #define XGENE_DMA_DESC_ELERR_RD(m)              \
 120         (((m) >> XGENE_DMA_DESC_ELERR_POS) & 0x3)
 121 #define XGENE_DMA_DESC_LERR_RD(m)               \
 122         (((m) >> XGENE_DMA_DESC_LERR_POS) & 0x7)
 123 #define XGENE_DMA_DESC_STATUS(elerr, lerr)      \
 124         (((elerr) << 4) | (lerr))
 125
 126 /* X-Gene DMA descriptor empty s/w signature */
 127 #define XGENE_DMA_DESC_EMPTY_SIGNATURE          ~0ULL
 128
 129 /* X-Gene DMA configurable parameters defines */
 130 #define XGENE_DMA_RING_NUM              512
 131 #define XGENE_DMA_BUFNUM                0x0
 132 #define XGENE_DMA_CPU_BUFNUM            0x18
 133 #define XGENE_DMA_RING_OWNER_DMA        0x03
 134 #define XGENE_DMA_RING_OWNER_CPU        0x0F
 135 #define XGENE_DMA_RING_TYPE_REGULAR     0x01
 136 #define XGENE_DMA_RING_WQ_DESC_SIZE     32      /* 32 Bytes */
 137 #define XGENE_DMA_RING_NUM_CONFIG       5
 138 #define XGENE_DMA_MAX_CHANNEL           4
 139 #define XGENE_DMA_XOR_CHANNEL           0
 140 #define XGENE_DMA_PQ_CHANNEL            1
 141 #define XGENE_DMA_MAX_BYTE_CNT          0x4000  /* 16 KB */
 142 #define XGENE_DMA_MAX_64B_DESC_BYTE_CNT 0x14000 /* 80 KB */
 143 #define XGENE_DMA_MAX_XOR_SRC           5
 144 #define XGENE_DMA_16K_BUFFER_LEN_CODE   0x0
 145 #define XGENE_DMA_INVALID_LEN_CODE      0x7800000000000000ULL
 146
 147 /* X-Gene DMA descriptor error codes */
 148 #define ERR_DESC_AXI                    0x01
 149 #define ERR_BAD_DESC                    0x02
 150 #define ERR_READ_DATA_AXI               0x03
 151 #define ERR_WRITE_DATA_AXI              0x04
 152 #define ERR_FBP_TIMEOUT                 0x05
 153 #define ERR_ECC                         0x06
 154 #define ERR_DIFF_SIZE                   0x08
 155 #define ERR_SCT_GAT_LEN                 0x09
 156 #define ERR_CRC_ERR                     0x11
 157 #define ERR_CHKSUM                      0x12
 158 #define ERR_DIF                         0x13
 159
 160 /* X-Gene DMA error interrupt codes */
 161 #define ERR_DIF_SIZE_INT                0x0
 162 #define ERR_GS_ERR_INT                  0x1
 163 #define ERR_FPB_TIMEO_INT               0x2
 164 #define ERR_WFIFO_OVF_INT               0x3
 165 #define ERR_RFIFO_OVF_INT               0x4
 166 #define ERR_WR_TIMEO_INT                0x5
 167 #define ERR_RD_TIMEO_INT                0x6
 168 #define ERR_WR_ERR_INT                  0x7
 169 #define ERR_RD_ERR_INT                  0x8
 170 #define ERR_BAD_DESC_INT                0x9
 171 #define ERR_DESC_DST_INT                0xA
 172 #define ERR_DESC_SRC_INT                0xB
 173
 174 /* X-Gene DMA flyby operation code */
 175 #define FLYBY_2SRC_XOR                  0x80
 176 #define FLYBY_3SRC_XOR                  0x90
 177 #define FLYBY_4SRC_XOR                  0xA0
 178 #define FLYBY_5SRC_XOR                  0xB0
 179
 180 /* X-Gene DMA SW descriptor flags */
 181 #define XGENE_DMA_FLAG_64B_DESC         BIT(0)
 182
 183 /* Define to dump X-Gene DMA descriptor */
 184 #define XGENE_DMA_DESC_DUMP(desc, m)    \
 185         print_hex_dump(KERN_ERR, (m),   \
 186                         DUMP_PREFIX_ADDRESS, 16, 8, (desc), 32, 0)
 187
 188 #define to_dma_desc_sw(tx)              \
 189         container_of(tx, struct xgene_dma_desc_sw, tx)
 190 #define to_dma_chan(dchan)              \
 191         container_of(dchan, struct xgene_dma_chan, dma_chan)
 192
 193 #define chan_dbg(chan, fmt, arg...)     \
 194         dev_dbg(chan->dev, "%s: " fmt, chan->name, ##arg)
 195 #define chan_err(chan, fmt, arg...)     \
 196         dev_err(chan->dev, "%s: " fmt, chan->name, ##arg)
 197
 198 struct xgene_dma_desc_hw {
 199         __le64 m0;
 200         __le64 m1;
 201         __le64 m2;
 202         __le64 m3;
 203 };
 204
 205 enum xgene_dma_ring_cfgsize {
 206         XGENE_DMA_RING_CFG_SIZE_512B,
 207         XGENE_DMA_RING_CFG_SIZE_2KB,
 208         XGENE_DMA_RING_CFG_SIZE_16KB,
 209         XGENE_DMA_RING_CFG_SIZE_64KB,
 210         XGENE_DMA_RING_CFG_SIZE_512KB,
 211         XGENE_DMA_RING_CFG_SIZE_INVALID
 212 };
 213
 214 struct xgene_dma_ring {
 215         struct xgene_dma *pdma;
 216         u8 buf_num;
 217         u16 id;
 218         u16 num;
 219         u16 head;
 220         u16 owner;
 221         u16 slots;
 222         u16 dst_ring_num;
 223         u32 size;
 224         void __iomem *cmd;
 225         void __iomem *cmd_base;
 226         dma_addr_t desc_paddr;
 227         u32 state[XGENE_DMA_RING_NUM_CONFIG];
 228         enum xgene_dma_ring_cfgsize cfgsize;
 229         union {
 230                 void *desc_vaddr;
 231                 struct xgene_dma_desc_hw *desc_hw;
 232         };
 233 };
 234
 235 struct xgene_dma_desc_sw {
 236         struct xgene_dma_desc_hw desc1;
 237         struct xgene_dma_desc_hw desc2;
 238         u32 flags;
 239         struct list_head node;
 240         struct list_head tx_list;
 241         struct dma_async_tx_descriptor tx;
 242 };
 243
 244 /**
 245  * struct xgene_dma_chan - internal representation of an X-Gene DMA channel
 246  * @dma_chan: dmaengine channel object member
 247  * @pdma: X-Gene DMA device structure reference
 248  * @dev: struct device reference for dma mapping api
 249  * @id: raw id of this channel
 250  * @rx_irq: channel IRQ
 251  * @name: name of X-Gene DMA channel
 252  * @lock: serializes enqueue/dequeue operations to the descriptor pool
 253  * @pending: number of transaction request pushed to DMA controller for
 254  *      execution, but still waiting for completion,
 255  * @max_outstanding: max number of outstanding request we can push to channel
 256  * @ld_pending: descriptors which are queued to run, but have not yet been
 257  *      submitted to the hardware for execution
 258  * @ld_running: descriptors which are currently being executing by the hardware
 259  * @ld_completed: descriptors which have finished execution by the hardware.
 260  *      These descriptors have already had their cleanup actions run. They
 261  *      are waiting for the ACK bit to be set by the async tx API.
 262  * @desc_pool: descriptor pool for DMA operations
 263  * @tasklet: bottom half where all completed descriptors cleans
 264  * @tx_ring: transmit ring descriptor that we use to prepare actual
 265  *      descriptors for further executions
 266  * @rx_ring: receive ring descriptor that we use to get completed DMA
 267  *      descriptors during cleanup time
 268  */
 269 struct xgene_dma_chan {
 270         struct dma_chan dma_chan;
 271         struct xgene_dma *pdma;
 272         struct device *dev;
 273         int id;
 274         int rx_irq;
 275         char name[10];
 276         spinlock_t lock;
 277         int pending;
 278         int max_outstanding;
 279         struct list_head ld_pending;
 280         struct list_head ld_running;
 281         struct list_head ld_completed;
 282         struct dma_pool *desc_pool;
 283         struct tasklet_struct tasklet;
 284         struct xgene_dma_ring tx_ring;
 285         struct xgene_dma_ring rx_ring;
 286 };
 287
 288 /**
 289  * struct xgene_dma - internal representation of an X-Gene DMA device
 290  * @err_irq: DMA error irq number
 291  * @ring_num: start id number for DMA ring
 292  * @csr_dma: base for DMA register access
 293  * @csr_ring: base for DMA ring register access
 294  * @csr_ring_cmd: base for DMA ring command register access
 295  * @csr_efuse: base for efuse register access
 296  * @dma_dev: embedded struct dma_device
 297  * @chan: reference to X-Gene DMA channels
 298  */
 299 struct xgene_dma {
 300         struct device *dev;
 301         struct clk *clk;
 302         int err_irq;
 303         int ring_num;
 304         void __iomem *csr_dma;
 305         void __iomem *csr_ring;
 306         void __iomem *csr_ring_cmd;
 307         void __iomem *csr_efuse;
 308         struct dma_device dma_dev[XGENE_DMA_MAX_CHANNEL];
 309         struct xgene_dma_chan chan[XGENE_DMA_MAX_CHANNEL];
 310 };
 311
 312 static const char * const xgene_dma_desc_err[] = {
 313         [ERR_DESC_AXI] = "AXI error when reading src/dst link list",
 314         [ERR_BAD_DESC] = "ERR or El_ERR fields not set to zero in desc",
 315         [ERR_READ_DATA_AXI] = "AXI error when reading data",
 316         [ERR_WRITE_DATA_AXI] = "AXI error when writing data",
 317         [ERR_FBP_TIMEOUT] = "Timeout on bufpool fetch",
 318         [ERR_ECC] = "ECC double bit error",
 319         [ERR_DIFF_SIZE] = "Bufpool too small to hold all the DIF result",
 320         [ERR_SCT_GAT_LEN] = "Gather and scatter data length not same",
 321         [ERR_CRC_ERR] = "CRC error",
 322         [ERR_CHKSUM] = "Checksum error",
 323         [ERR_DIF] = "DIF error",
 324 };
 325
 326 static const char * const xgene_dma_err[] = {
 327         [ERR_DIF_SIZE_INT] = "DIF size error",
 328         [ERR_GS_ERR_INT] = "Gather scatter not same size error",
 329         [ERR_FPB_TIMEO_INT] = "Free pool time out error",
 330         [ERR_WFIFO_OVF_INT] = "Write FIFO over flow error",
 331         [ERR_RFIFO_OVF_INT] = "Read FIFO over flow error",
 332         [ERR_WR_TIMEO_INT] = "Write time out error",
 333         [ERR_RD_TIMEO_INT] = "Read time out error",
 334         [ERR_WR_ERR_INT] = "HBF bus write error",
 335         [ERR_RD_ERR_INT] = "HBF bus read error",
 336         [ERR_BAD_DESC_INT] = "Ring descriptor HE0 not set error",
 337         [ERR_DESC_DST_INT] = "HFB reading dst link address error",
 338         [ERR_DESC_SRC_INT] = "HFB reading src link address error",
 339 };
 340
 341 static bool is_pq_enabled(struct xgene_dma *pdma)
 342 {
 343         u32 val;
 344
 345         val = ioread32(pdma->csr_efuse + XGENE_SOC_JTAG1_SHADOW);
 346         return !(val & XGENE_DMA_PQ_DISABLE_MASK);
 347 }
 348
 349 static u64 xgene_dma_encode_len(size_t len)
 350 {
 351         return (len < XGENE_DMA_MAX_BYTE_CNT) ?
 352                 ((u64)len << XGENE_DMA_DESC_BUFLEN_POS) :
 353                 XGENE_DMA_16K_BUFFER_LEN_CODE;
 354 }
 355
 356 static u8 xgene_dma_encode_xor_flyby(u32 src_cnt)
 357 {
 358         static u8 flyby_type[] = {
 359                 FLYBY_2SRC_XOR, /* Dummy */
 360                 FLYBY_2SRC_XOR, /* Dummy */
 361                 FLYBY_2SRC_XOR,
 362                 FLYBY_3SRC_XOR,
 363                 FLYBY_4SRC_XOR,
 364                 FLYBY_5SRC_XOR
 365         };
 366
 367         return flyby_type[src_cnt];
 368 }
 369
 370 static void xgene_dma_set_src_buffer(__le64 *ext8, size_t *len,
 371                                      dma_addr_t *paddr)
 372 {
 373         size_t nbytes = (*len < XGENE_DMA_MAX_BYTE_CNT) ?
 374                         *len : XGENE_DMA_MAX_BYTE_CNT;
 375
 376         *ext8 |= cpu_to_le64(*paddr);
 377         *ext8 |= cpu_to_le64(xgene_dma_encode_len(nbytes));
 378         *len -= nbytes;
 379         *paddr += nbytes;
 380 }
 381
 382 static __le64 *xgene_dma_lookup_ext8(struct xgene_dma_desc_hw *desc, int idx)
 383 {
 384         switch (idx) {
 385         case 0:
 386                 return &desc->m1;
 387         case 1:
 388                 return &desc->m0;
 389         case 2:
 390                 return &desc->m3;
 391         case 3:
 392                 return &desc->m2;
 393         default:
 394                 pr_err("Invalid dma descriptor index\n");
 395         }
 396
 397         return NULL;
 398 }
 399
 400 static void xgene_dma_init_desc(struct xgene_dma_desc_hw *desc,
 401                                 u16 dst_ring_num)
 402 {
 403         desc->m0 |= cpu_to_le64(XGENE_DMA_DESC_IN_BIT);
 404         desc->m0 |= cpu_to_le64((u64)XGENE_DMA_RING_OWNER_DMA <<
 405                                 XGENE_DMA_DESC_RTYPE_POS);
 406         desc->m1 |= cpu_to_le64(XGENE_DMA_DESC_C_BIT);
 407         desc->m3 |= cpu_to_le64((u64)dst_ring_num <<
 408                                 XGENE_DMA_DESC_HOENQ_NUM_POS);
 409 }
 410
 411 static void xgene_dma_prep_xor_desc(struct xgene_dma_chan *chan,
 412                                     struct xgene_dma_desc_sw *desc_sw,
 413                                     dma_addr_t *dst, dma_addr_t *src,
 414                                     u32 src_cnt, size_t *nbytes,
 415                                     const u8 *scf)
 416 {
 417         struct xgene_dma_desc_hw *desc1, *desc2;
 418         size_t len = *nbytes;
 419         int i;
 420
 421         desc1 = &desc_sw->desc1;
 422         desc2 = &desc_sw->desc2;
 423
 424         /* Initialize DMA descriptor */
 425         xgene_dma_init_desc(desc1, chan->tx_ring.dst_ring_num);
 426
 427         /* Set destination address */
 428         desc1->m2 |= cpu_to_le64(XGENE_DMA_DESC_DR_BIT);
 429         desc1->m3 |= cpu_to_le64(*dst);
 430
 431         /* We have multiple source addresses, so need to set NV bit*/
 432         desc1->m0 |= cpu_to_le64(XGENE_DMA_DESC_NV_BIT);
 433
 434         /* Set flyby opcode */
 435         desc1->m2 |= cpu_to_le64(xgene_dma_encode_xor_flyby(src_cnt));
 436
 437         /* Set 1st to 5th source addresses */
 438         for (i = 0; i < src_cnt; i++) {
 439                 len = *nbytes;
 440                 xgene_dma_set_src_buffer((i == 0) ? &desc1->m1 :
 441                                          xgene_dma_lookup_ext8(desc2, i - 1),
 442                                          &len, &src[i]);
 443                 desc1->m2 |= cpu_to_le64((scf[i] << ((i + 1) * 8)));
 444         }
 445
 446         /* Update meta data */
 447         *nbytes = len;
 448         *dst += XGENE_DMA_MAX_BYTE_CNT;
 449
 450         /* We need always 64B descriptor to perform xor or pq operations */
 451         desc_sw->flags |= XGENE_DMA_FLAG_64B_DESC;
 452 }
 453
 454 static dma_cookie_t xgene_dma_tx_submit(struct dma_async_tx_descriptor *tx)
 455 {
 456         struct xgene_dma_desc_sw *desc;
 457         struct xgene_dma_chan *chan;
 458         dma_cookie_t cookie;
 459
 460         if (unlikely(!tx))
 461                 return -EINVAL;
 462
 463         chan = to_dma_chan(tx->chan);
 464         desc = to_dma_desc_sw(tx);
 465
 466         spin_lock_bh(&chan->lock);
 467
 468         cookie = dma_cookie_assign(tx);
 469
 470         /* Add this transaction list onto the tail of the pending queue */
 471         list_splice_tail_init(&desc->tx_list, &chan->ld_pending);
 472
 473         spin_unlock_bh(&chan->lock);
 474
 475         return cookie;
 476 }
 477
 478 static void xgene_dma_clean_descriptor(struct xgene_dma_chan *chan,
 479                                        struct xgene_dma_desc_sw *desc)
 480 {
 481         list_del(&desc->node);
 482         chan_dbg(chan, "LD %p free\n", desc);
 483         dma_pool_free(chan->desc_pool, desc, desc->tx.phys);
 484 }
 485
 486 static struct xgene_dma_desc_sw *xgene_dma_alloc_descriptor(
 487                                  struct xgene_dma_chan *chan)
 488 {
 489         struct xgene_dma_desc_sw *desc;
 490         dma_addr_t phys;
 491
 492         desc = dma_pool_zalloc(chan->desc_pool, GFP_NOWAIT, &phys);
 493         if (!desc) {
 494                 chan_err(chan, "Failed to allocate LDs\n");
 495                 return NULL;
 496         }
 497
 498         INIT_LIST_HEAD(&desc->tx_list);
 499         desc->tx.phys = phys;
 500         desc->tx.tx_submit = xgene_dma_tx_submit;
 501         dma_async_tx_descriptor_init(&desc->tx, &chan->dma_chan);
 502
 503         chan_dbg(chan, "LD %p allocated\n", desc);
 504
 505         return desc;
 506 }
 507
 508 /**
 509  * xgene_dma_clean_completed_descriptor - free all descriptors which
 510  * has been completed and acked
 511  * @chan: X-Gene DMA channel
 512  *
 513  * This function is used on all completed and acked descriptors.
 514  */
 515 static void xgene_dma_clean_completed_descriptor(struct xgene_dma_chan *chan)
 516 {
 517         struct xgene_dma_desc_sw *desc, *_desc;
 518
 519         /* Run the callback for each descriptor, in order */
 520         list_for_each_entry_safe(desc, _desc, &chan->ld_completed, node) {
 521                 if (async_tx_test_ack(&desc->tx))
 522                         xgene_dma_clean_descriptor(chan, desc);
 523         }
 524 }
 525
 526 /**
 527  * xgene_dma_run_tx_complete_actions - cleanup a single link descriptor
 528  * @chan: X-Gene DMA channel
 529  * @desc: descriptor to cleanup and free
 530  *
 531  * This function is used on a descriptor which has been executed by the DMA
 532  * controller. It will run any callbacks, submit any dependencies.
 533  */
 534 static void xgene_dma_run_tx_complete_actions(struct xgene_dma_chan *chan,
 535                                               struct xgene_dma_desc_sw *desc)
 536 {
 537         struct dma_async_tx_descriptor *tx = &desc->tx;
 538
 539         /*
 540          * If this is not the last transaction in the group,
 541          * then no need to complete cookie and run any callback as
 542          * this is not the tx_descriptor which had been sent to caller
 543          * of this DMA request
 544          */
 545
 546         if (tx->cookie == 0)
 547                 return;
 548
 549         dma_cookie_complete(tx);
 550         dma_descriptor_unmap(tx);
 551
 552         /* Run the link descriptor callback function */
 553         dmaengine_desc_get_callback_invoke(tx, NULL);
 554
 555         /* Run any dependencies */
 556         dma_run_dependencies(tx);
 557 }
 558
 559 /**
 560  * xgene_dma_clean_running_descriptor - move the completed descriptor from
 561  * ld_running to ld_completed
 562  * @chan: X-Gene DMA channel
 563  * @desc: the descriptor which is completed
 564  *
 565  * Free the descriptor directly if acked by async_tx api,
 566  * else move it to queue ld_completed.
 567  */
 568 static void xgene_dma_clean_running_descriptor(struct xgene_dma_chan *chan,
 569                                                struct xgene_dma_desc_sw *desc)
 570 {
 571         /* Remove from the list of running transactions */
 572         list_del(&desc->node);
 573
 574         /*
 575          * the client is allowed to attach dependent operations
 576          * until 'ack' is set
 577          */
 578         if (!async_tx_test_ack(&desc->tx)) {
 579                 /*
 580                  * Move this descriptor to the list of descriptors which is
 581                  * completed, but still awaiting the 'ack' bit to be set.
 582                  */
 583                 list_add_tail(&desc->node, &chan->ld_completed);
 584                 return;
 585         }
 586
 587         chan_dbg(chan, "LD %p free\n", desc);
 588         dma_pool_free(chan->desc_pool, desc, desc->tx.phys);
 589 }
 590
 591 static void xgene_chan_xfer_request(struct xgene_dma_chan *chan,
 592                                     struct xgene_dma_desc_sw *desc_sw)
 593 {
 594         struct xgene_dma_ring *ring = &chan->tx_ring;
 595         struct xgene_dma_desc_hw *desc_hw;
 596
 597         /* Get hw descriptor from DMA tx ring */
 598         desc_hw = &ring->desc_hw[ring->head];
 599
 600         /*
 601          * Increment the head count to point next
 602          * descriptor for next time
 603          */
 604         if (++ring->head == ring->slots)
 605                 ring->head = 0;
 606
 607         /* Copy prepared sw descriptor data to hw descriptor */
 608         memcpy(desc_hw, &desc_sw->desc1, sizeof(*desc_hw));
 609
 610         /*
 611          * Check if we have prepared 64B descriptor,
 612          * in this case we need one more hw descriptor
 613          */
 614         if (desc_sw->flags & XGENE_DMA_FLAG_64B_DESC) {
 615                 desc_hw = &ring->desc_hw[ring->head];
 616
 617                 if (++ring->head == ring->slots)
 618                         ring->head = 0;
 619
 620                 memcpy(desc_hw, &desc_sw->desc2, sizeof(*desc_hw));
 621         }
 622
 623         /* Increment the pending transaction count */
 624         chan->pending += ((desc_sw->flags &
 625                           XGENE_DMA_FLAG_64B_DESC) ? 2 : 1);
 626
 627         /* Notify the hw that we have descriptor ready for execution */
 628         iowrite32((desc_sw->flags & XGENE_DMA_FLAG_64B_DESC) ?
 629                   2 : 1, ring->cmd);
 630 }
 631
 632 /**
 633  * xgene_chan_xfer_ld_pending - push any pending transactions to hw
 634  * @chan : X-Gene DMA channel
 635  *
 636  * LOCKING: must hold chan->lock
 637  */
 638 static void xgene_chan_xfer_ld_pending(struct xgene_dma_chan *chan)
 639 {
 640         struct xgene_dma_desc_sw *desc_sw, *_desc_sw;
 641
 642         /*
 643          * If the list of pending descriptors is empty, then we
 644          * don't need to do any work at all
 645          */
 646         if (list_empty(&chan->ld_pending)) {
 647                 chan_dbg(chan, "No pending LDs\n");
 648                 return;
 649         }
 650
 651         /*
 652          * Move elements from the queue of pending transactions onto the list
 653          * of running transactions and push it to hw for further executions
 654          */
 655         list_for_each_entry_safe(desc_sw, _desc_sw, &chan->ld_pending, node) {
 656                 /*
 657                  * Check if have pushed max number of transactions to hw
 658                  * as capable, so let's stop here and will push remaining
 659                  * elements from pening ld queue after completing some
 660                  * descriptors that we have already pushed
 661                  */
 662                 if (chan->pending >= chan->max_outstanding)
 663                         return;
 664
 665                 xgene_chan_xfer_request(chan, desc_sw);
 666
 667                 /*
 668                  * Delete this element from ld pending queue and append it to
 669                  * ld running queue
 670                  */
 671                 list_move_tail(&desc_sw->node, &chan->ld_running);
 672         }
 673 }
 674
 675 /**
 676  * xgene_dma_cleanup_descriptors - cleanup link descriptors which are completed
 677  * and move them to ld_completed to free until flag 'ack' is set
 678  * @chan: X-Gene DMA channel
 679  *
 680  * This function is used on descriptors which have been executed by the DMA
 681  * controller. It will run any callbacks, submit any dependencies, then
 682  * free these descriptors if flag 'ack' is set.
 683  */
 684 static void xgene_dma_cleanup_descriptors(struct xgene_dma_chan *chan)
 685 {
 686         struct xgene_dma_ring *ring = &chan->rx_ring;
 687         struct xgene_dma_desc_sw *desc_sw, *_desc_sw;
 688         struct xgene_dma_desc_hw *desc_hw;
 689         struct list_head ld_completed;
 690         u8 status;
 691
 692         INIT_LIST_HEAD(&ld_completed);
 693
 694         spin_lock(&chan->lock);
 695
 696         /* Clean already completed and acked descriptors */
 697         xgene_dma_clean_completed_descriptor(chan);
 698
 699         /* Move all completed descriptors to ld completed queue, in order */
 700         list_for_each_entry_safe(desc_sw, _desc_sw, &chan->ld_running, node) {
 701                 /* Get subsequent hw descriptor from DMA rx ring */
 702                 desc_hw = &ring->desc_hw[ring->head];
 703
 704                 /* Check if this descriptor has been completed */
 705                 if (unlikely(le64_to_cpu(desc_hw->m0) ==
 706                              XGENE_DMA_DESC_EMPTY_SIGNATURE))
 707                         break;
 708
 709                 if (++ring->head == ring->slots)
 710                         ring->head = 0;
 711
 712                 /* Check if we have any error with DMA transactions */
 713                 status = XGENE_DMA_DESC_STATUS(
 714                                 XGENE_DMA_DESC_ELERR_RD(le64_to_cpu(
 715                                                         desc_hw->m0)),
 716                                 XGENE_DMA_DESC_LERR_RD(le64_to_cpu(
 717                                                        desc_hw->m0)));
 718                 if (status) {
 719                         /* Print the DMA error type */
 720                         chan_err(chan, "%s\n", xgene_dma_desc_err[status]);
 721
 722                         /*
 723                          * We have DMA transactions error here. Dump DMA Tx
 724                          * and Rx descriptors for this request */
 725                         XGENE_DMA_DESC_DUMP(&desc_sw->desc1,
 726                                             "X-Gene DMA TX DESC1: ");
 727
 728                         if (desc_sw->flags & XGENE_DMA_FLAG_64B_DESC)
 729                                 XGENE_DMA_DESC_DUMP(&desc_sw->desc2,
 730                                                     "X-Gene DMA TX DESC2: ");
 731
 732                         XGENE_DMA_DESC_DUMP(desc_hw,
 733                                             "X-Gene DMA RX ERR DESC: ");
 734                 }
 735
 736                 /* Notify the hw about this completed descriptor */
 737                 iowrite32(-1, ring->cmd);
 738
 739                 /* Mark this hw descriptor as processed */
 740                 desc_hw->m0 = cpu_to_le64(XGENE_DMA_DESC_EMPTY_SIGNATURE);
 741
 742                 /*
 743                  * Decrement the pending transaction count
 744                  * as we have processed one
 745                  */
 746                 chan->pending -= ((desc_sw->flags &
 747                                   XGENE_DMA_FLAG_64B_DESC) ? 2 : 1);
 748
 749                 /*
 750                  * Delete this node from ld running queue and append it to
 751                  * ld completed queue for further processing
 752                  */
 753                 list_move_tail(&desc_sw->node, &ld_completed);
 754         }
 755
 756         /*
 757          * Start any pending transactions automatically
 758          * In the ideal case, we keep the DMA controller busy while we go
 759          * ahead and free the descriptors below.
 760          */
 761         xgene_chan_xfer_ld_pending(chan);
 762
 763         spin_unlock(&chan->lock);
 764
 765         /* Run the callback for each descriptor, in order */
 766         list_for_each_entry_safe(desc_sw, _desc_sw, &ld_completed, node) {
 767                 xgene_dma_run_tx_complete_actions(chan, desc_sw);
 768                 xgene_dma_clean_running_descriptor(chan, desc_sw);
 769         }
 770 }
 771
 772 static int xgene_dma_alloc_chan_resources(struct dma_chan *dchan)
 773 {
 774         struct xgene_dma_chan *chan = to_dma_chan(dchan);
 775
 776         /* Has this channel already been allocated? */
 777         if (chan->desc_pool)
 778                 return 1;
 779
 780         chan->desc_pool = dma_pool_create(chan->name, chan->dev,
 781                                           sizeof(struct xgene_dma_desc_sw),
 782                                           0, 0);
 783         if (!chan->desc_pool) {
 784                 chan_err(chan, "Failed to allocate descriptor pool\n");
 785                 return -ENOMEM;
 786         }
 787
 788         chan_dbg(chan, "Allocate descriptor pool\n");
 789
 790         return 1;
 791 }
 792
 793 /**
 794  * xgene_dma_free_desc_list - Free all descriptors in a queue
 795  * @chan: X-Gene DMA channel
 796  * @list: the list to free
 797  *
 798  * LOCKING: must hold chan->lock
 799  */
 800 static void xgene_dma_free_desc_list(struct xgene_dma_chan *chan,
 801                                      struct list_head *list)
 802 {
 803         struct xgene_dma_desc_sw *desc, *_desc;
 804
 805         list_for_each_entry_safe(desc, _desc, list, node)
 806                 xgene_dma_clean_descriptor(chan, desc);
 807 }
 808
 809 static void xgene_dma_free_chan_resources(struct dma_chan *dchan)
 810 {
 811         struct xgene_dma_chan *chan = to_dma_chan(dchan);
 812
 813         chan_dbg(chan, "Free all resources\n");
 814
 815         if (!chan->desc_pool)
 816                 return;
 817
 818         /* Process all running descriptor */
 819         xgene_dma_cleanup_descriptors(chan);
 820
 821         spin_lock_bh(&chan->lock);
 822
 823         /* Clean all link descriptor queues */
 824         xgene_dma_free_desc_list(chan, &chan->ld_pending);
 825         xgene_dma_free_desc_list(chan, &chan->ld_running);
 826         xgene_dma_free_desc_list(chan, &chan->ld_completed);
 827
 828         spin_unlock_bh(&chan->lock);
 829
 830         /* Delete this channel DMA pool */
 831         dma_pool_destroy(chan->desc_pool);
 832         chan->desc_pool = NULL;
 833 }
 834
 835 static struct dma_async_tx_descriptor *xgene_dma_prep_xor(
 836         struct dma_chan *dchan, dma_addr_t dst, dma_addr_t *src,
 837         u32 src_cnt, size_t len, unsigned long flags)
 838 {
 839         struct xgene_dma_desc_sw *first = NULL, *new;
 840         struct xgene_dma_chan *chan;
 841         static u8 multi[XGENE_DMA_MAX_XOR_SRC] = {
 842                                 0x01, 0x01, 0x01, 0x01, 0x01};
 843
 844         if (unlikely(!dchan || !len))
 845                 return NULL;
 846
 847         chan = to_dma_chan(dchan);
 848
 849         do {
 850                 /* Allocate the link descriptor from DMA pool */
 851                 new = xgene_dma_alloc_descriptor(chan);
 852                 if (!new)
 853                         goto fail;
 854
 855                 /* Prepare xor DMA descriptor */
 856                 xgene_dma_prep_xor_desc(chan, new, &dst, src,
 857                                         src_cnt, &len, multi);
 858
 859                 if (!first)
 860                         first = new;
 861
 862                 new->tx.cookie = 0;
 863                 async_tx_ack(&new->tx);
 864
 865                 /* Insert the link descriptor to the LD ring */
 866                 list_add_tail(&new->node, &first->tx_list);
 867         } while (len);
 868
 869         new->tx.flags = flags; /* client is in control of this ack */
 870         new->tx.cookie = -EBUSY;
 871         list_splice(&first->tx_list, &new->tx_list);
 872
 873         return &new->tx;
 874
 875 fail:
 876         if (!first)
 877                 return NULL;
 878
 879         xgene_dma_free_desc_list(chan, &first->tx_list);
 880         return NULL;
 881 }
 882
 883 static struct dma_async_tx_descriptor *xgene_dma_prep_pq(
 884         struct dma_chan *dchan, dma_addr_t *dst, dma_addr_t *src,
 885         u32 src_cnt, const u8 *scf, size_t len, unsigned long flags)
 886 {
 887         struct xgene_dma_desc_sw *first = NULL, *new;
 888         struct xgene_dma_chan *chan;
 889         size_t _len = len;
 890         dma_addr_t _src[XGENE_DMA_MAX_XOR_SRC];
 891         static u8 multi[XGENE_DMA_MAX_XOR_SRC] = {0x01, 0x01, 0x01, 0x01, 0x01};
 892
 893         if (unlikely(!dchan || !len))
 894                 return NULL;
 895
 896         chan = to_dma_chan(dchan);
 897
 898         /*
 899          * Save source addresses on local variable, may be we have to
 900          * prepare two descriptor to generate P and Q if both enabled
 901          * in the flags by client
 902          */
 903         memcpy(_src, src, sizeof(*src) * src_cnt);
 904
 905         if (flags & DMA_PREP_PQ_DISABLE_P)
 906                 len = 0;
 907
 908         if (flags & DMA_PREP_PQ_DISABLE_Q)
 909                 _len = 0;
 910
 911         do {
 912                 /* Allocate the link descriptor from DMA pool */
 913                 new = xgene_dma_alloc_descriptor(chan);
 914                 if (!new)
 915                         goto fail;
 916
 917                 if (!first)
 918                         first = new;
 919
 920                 new->tx.cookie = 0;
 921                 async_tx_ack(&new->tx);
 922
 923                 /* Insert the link descriptor to the LD ring */
 924                 list_add_tail(&new->node, &first->tx_list);
 925
 926                 /*
 927                  * Prepare DMA descriptor to generate P,
 928                  * if DMA_PREP_PQ_DISABLE_P flag is not set
 929                  */
 930                 if (len) {
 931                         xgene_dma_prep_xor_desc(chan, new, &dst[0], src,
 932                                                 src_cnt, &len, multi);
 933                         continue;
 934                 }
 935
 936                 /*
 937                  * Prepare DMA descriptor to generate Q,
 938                  * if DMA_PREP_PQ_DISABLE_Q flag is not set
 939                  */
 940                 if (_len) {
 941                         xgene_dma_prep_xor_desc(chan, new, &dst[1], _src,
 942                                                 src_cnt, &_len, scf);
 943                 }
 944         } while (len || _len);
 945
 946         new->tx.flags = flags; /* client is in control of this ack */
 947         new->tx.cookie = -EBUSY;
 948         list_splice(&first->tx_list, &new->tx_list);
 949
 950         return &new->tx;
 951
 952 fail:
 953         if (!first)
 954                 return NULL;
 955
 956         xgene_dma_free_desc_list(chan, &first->tx_list);
 957         return NULL;
 958 }
 959
 960 static void xgene_dma_issue_pending(struct dma_chan *dchan)
 961 {
 962         struct xgene_dma_chan *chan = to_dma_chan(dchan);
 963
 964         spin_lock_bh(&chan->lock);
 965         xgene_chan_xfer_ld_pending(chan);
 966         spin_unlock_bh(&chan->lock);
 967 }
 968
 969 static enum dma_status xgene_dma_tx_status(struct dma_chan *dchan,
 970                                            dma_cookie_t cookie,
 971                                            struct dma_tx_state *txstate)
 972 {
 973         return dma_cookie_status(dchan, cookie, txstate);
 974 }
 975
 976 static void xgene_dma_tasklet_cb(unsigned long data)
 977 {
 978         struct xgene_dma_chan *chan = (struct xgene_dma_chan *)data;
 979
 980         /* Run all cleanup for descriptors which have been completed */
 981         xgene_dma_cleanup_descriptors(chan);
 982
 983         /* Re-enable DMA channel IRQ */
 984         enable_irq(chan->rx_irq);
 985 }
 986
 987 static irqreturn_t xgene_dma_chan_ring_isr(int irq, void *id)
 988 {
 989         struct xgene_dma_chan *chan = (struct xgene_dma_chan *)id;
 990
 991         BUG_ON(!chan);
 992
 993         /*
 994          * Disable DMA channel IRQ until we process completed
 995          * descriptors
 996          */
 997         disable_irq_nosync(chan->rx_irq);
 998
 999         /*
1000          * Schedule the tasklet to handle all cleanup of the current
1001          * transaction. It will start a new transaction if there is
1002          * one pending.
1003          */
1004         tasklet_schedule(&chan->tasklet);
1005
1006         return IRQ_HANDLED;
1007 }
1008
1009 static irqreturn_t xgene_dma_err_isr(int irq, void *id)
1010 {
1011         struct xgene_dma *pdma = (struct xgene_dma *)id;
1012         unsigned long int_mask;
1013         u32 val, i;
1014
1015         val = ioread32(pdma->csr_dma + XGENE_DMA_INT);
1016
1017         /* Clear DMA interrupts */
1018         iowrite32(val, pdma->csr_dma + XGENE_DMA_INT);
1019
1020         /* Print DMA error info */
1021         int_mask = val >> XGENE_DMA_INT_MASK_SHIFT;
1022         for_each_set_bit(i, &int_mask, ARRAY_SIZE(xgene_dma_err))
1023                 dev_err(pdma->dev,
1024                         "Interrupt status 0x%08X %s\n", val, xgene_dma_err[i]);
1025
1026         return IRQ_HANDLED;
1027 }
1028
1029 static void xgene_dma_wr_ring_state(struct xgene_dma_ring *ring)
1030 {
1031         int i;
1032
1033         iowrite32(ring->num, ring->pdma->csr_ring + XGENE_DMA_RING_STATE);
1034
1035         for (i = 0; i < XGENE_DMA_RING_NUM_CONFIG; i++)
1036                 iowrite32(ring->state[i], ring->pdma->csr_ring +
1037                           XGENE_DMA_RING_STATE_WR_BASE + (i * 4));
1038 }
1039
1040 static void xgene_dma_clr_ring_state(struct xgene_dma_ring *ring)
1041 {
1042         memset(ring->state, 0, sizeof(u32) * XGENE_DMA_RING_NUM_CONFIG);
1043         xgene_dma_wr_ring_state(ring);
1044 }
1045
1046 static void xgene_dma_setup_ring(struct xgene_dma_ring *ring)
1047 {
1048         void *ring_cfg = ring->state;
1049         u64 addr = ring->desc_paddr;
1050         u32 i, val;
1051
1052         ring->slots = ring->size / XGENE_DMA_RING_WQ_DESC_SIZE;
1053
1054         /* Clear DMA ring state */
1055         xgene_dma_clr_ring_state(ring);
1056
1057         /* Set DMA ring type */
1058         XGENE_DMA_RING_TYPE_SET(ring_cfg, XGENE_DMA_RING_TYPE_REGULAR);
1059
1060         if (ring->owner == XGENE_DMA_RING_OWNER_DMA) {
1061                 /* Set recombination buffer and timeout */
1062                 XGENE_DMA_RING_RECOMBBUF_SET(ring_cfg);
1063                 XGENE_DMA_RING_RECOMTIMEOUTL_SET(ring_cfg);
1064                 XGENE_DMA_RING_RECOMTIMEOUTH_SET(ring_cfg);
1065         }
1066
1067         /* Initialize DMA ring state */
1068         XGENE_DMA_RING_SELTHRSH_SET(ring_cfg);
1069         XGENE_DMA_RING_ACCEPTLERR_SET(ring_cfg);
1070         XGENE_DMA_RING_COHERENT_SET(ring_cfg);
1071         XGENE_DMA_RING_ADDRL_SET(ring_cfg, addr);
1072         XGENE_DMA_RING_ADDRH_SET(ring_cfg, addr);
1073         XGENE_DMA_RING_SIZE_SET(ring_cfg, ring->cfgsize);
1074
1075         /* Write DMA ring configurations */
1076         xgene_dma_wr_ring_state(ring);
1077
1078         /* Set DMA ring id */
1079         iowrite32(XGENE_DMA_RING_ID_SETUP(ring->id),
1080                   ring->pdma->csr_ring + XGENE_DMA_RING_ID);
1081
1082         /* Set DMA ring buffer */
1083         iowrite32(XGENE_DMA_RING_ID_BUF_SETUP(ring->num),
1084                   ring->pdma->csr_ring + XGENE_DMA_RING_ID_BUF);
1085
1086         if (ring->owner != XGENE_DMA_RING_OWNER_CPU)
1087                 return;
1088
1089         /* Set empty signature to DMA Rx ring descriptors */
1090         for (i = 0; i < ring->slots; i++) {
1091                 struct xgene_dma_desc_hw *desc;
1092
1093                 desc = &ring->desc_hw[i];
1094                 desc->m0 = cpu_to_le64(XGENE_DMA_DESC_EMPTY_SIGNATURE);
1095         }
1096
1097         /* Enable DMA Rx ring interrupt */
1098         val = ioread32(ring->pdma->csr_ring + XGENE_DMA_RING_NE_INT_MODE);
1099         XGENE_DMA_RING_NE_INT_MODE_SET(val, ring->buf_num);
1100         iowrite32(val, ring->pdma->csr_ring + XGENE_DMA_RING_NE_INT_MODE);
1101 }
1102
1103 static void xgene_dma_clear_ring(struct xgene_dma_ring *ring)
1104 {
1105         u32 ring_id, val;
1106
1107         if (ring->owner == XGENE_DMA_RING_OWNER_CPU) {
1108                 /* Disable DMA Rx ring interrupt */
1109                 val = ioread32(ring->pdma->csr_ring +
1110                                XGENE_DMA_RING_NE_INT_MODE);
1111                 XGENE_DMA_RING_NE_INT_MODE_RESET(val, ring->buf_num);
1112                 iowrite32(val, ring->pdma->csr_ring +
1113                           XGENE_DMA_RING_NE_INT_MODE);
1114         }
1115
1116         /* Clear DMA ring state */
1117         ring_id = XGENE_DMA_RING_ID_SETUP(ring->id);
1118         iowrite32(ring_id, ring->pdma->csr_ring + XGENE_DMA_RING_ID);
1119
1120         iowrite32(0, ring->pdma->csr_ring + XGENE_DMA_RING_ID_BUF);
1121         xgene_dma_clr_ring_state(ring);
1122 }
1123
1124 static void xgene_dma_set_ring_cmd(struct xgene_dma_ring *ring)
1125 {
1126         ring->cmd_base = ring->pdma->csr_ring_cmd +
1127                                 XGENE_DMA_RING_CMD_BASE_OFFSET((ring->num -
1128                                                           XGENE_DMA_RING_NUM));
1129
1130         ring->cmd = ring->cmd_base + XGENE_DMA_RING_CMD_OFFSET;
1131 }
1132
1133 static int xgene_dma_get_ring_size(struct xgene_dma_chan *chan,
1134                                    enum xgene_dma_ring_cfgsize cfgsize)
1135 {
1136         int size;
1137
1138         switch (cfgsize) {
1139         case XGENE_DMA_RING_CFG_SIZE_512B:
1140                 size = 0x200;
1141                 break;
1142         case XGENE_DMA_RING_CFG_SIZE_2KB:
1143                 size = 0x800;
1144                 break;
1145         case XGENE_DMA_RING_CFG_SIZE_16KB:
1146                 size = 0x4000;
1147                 break;
1148         case XGENE_DMA_RING_CFG_SIZE_64KB:
1149                 size = 0x10000;
1150                 break;
1151         case XGENE_DMA_RING_CFG_SIZE_512KB:
1152                 size = 0x80000;
1153                 break;
1154         default:
1155                 chan_err(chan, "Unsupported cfg ring size %d\n", cfgsize);
1156                 return -EINVAL;
1157         }
1158
1159         return size;
1160 }
1161
1162 static void xgene_dma_delete_ring_one(struct xgene_dma_ring *ring)
1163 {
1164         /* Clear DMA ring configurations */
1165         xgene_dma_clear_ring(ring);
1166
1167         /* De-allocate DMA ring descriptor */
1168         if (ring->desc_vaddr) {
1169                 dma_free_coherent(ring->pdma->dev, ring->size,
1170                                   ring->desc_vaddr, ring->desc_paddr);
1171                 ring->desc_vaddr = NULL;
1172         }
1173 }
1174
1175 static void xgene_dma_delete_chan_rings(struct xgene_dma_chan *chan)
1176 {
1177         xgene_dma_delete_ring_one(&chan->rx_ring);
1178         xgene_dma_delete_ring_one(&chan->tx_ring);
1179 }
1180
1181 static int xgene_dma_create_ring_one(struct xgene_dma_chan *chan,
1182                                      struct xgene_dma_ring *ring,
1183                                      enum xgene_dma_ring_cfgsize cfgsize)
1184 {
1185         int ret;
1186
1187         /* Setup DMA ring descriptor variables */
1188         ring->pdma = chan->pdma;
1189         ring->cfgsize = cfgsize;
1190         ring->num = chan->pdma->ring_num++;
1191         ring->id = XGENE_DMA_RING_ID_GET(ring->owner, ring->buf_num);
1192
1193         ret = xgene_dma_get_ring_size(chan, cfgsize);
1194         if (ret <= 0)
1195                 return ret;
1196         ring->size = ret;
1197
1198         /* Allocate memory for DMA ring descriptor */
1199         ring->desc_vaddr = dma_alloc_coherent(chan->dev, ring->size,
1200                                               &ring->desc_paddr, GFP_KERNEL);
1201         if (!ring->desc_vaddr) {
1202                 chan_err(chan, "Failed to allocate ring desc\n");
1203                 return -ENOMEM;
1204         }
1205
1206         /* Configure and enable DMA ring */
1207         xgene_dma_set_ring_cmd(ring);
1208         xgene_dma_setup_ring(ring);
1209
1210         return 0;
1211 }
1212
1213 static int xgene_dma_create_chan_rings(struct xgene_dma_chan *chan)
1214 {
1215         struct xgene_dma_ring *rx_ring = &chan->rx_ring;
1216         struct xgene_dma_ring *tx_ring = &chan->tx_ring;
1217         int ret;
1218
1219         /* Create DMA Rx ring descriptor */
1220         rx_ring->owner = XGENE_DMA_RING_OWNER_CPU;
1221         rx_ring->buf_num = XGENE_DMA_CPU_BUFNUM + chan->id;
1222
1223         ret = xgene_dma_create_ring_one(chan, rx_ring,
1224                                         XGENE_DMA_RING_CFG_SIZE_64KB);
1225         if (ret)
1226                 return ret;
1227
1228         chan_dbg(chan, "Rx ring id 0x%X num %d desc 0x%p\n",
1229                  rx_ring->id, rx_ring->num, rx_ring->desc_vaddr);
1230
1231         /* Create DMA Tx ring descriptor */
1232         tx_ring->owner = XGENE_DMA_RING_OWNER_DMA;
1233         tx_ring->buf_num = XGENE_DMA_BUFNUM + chan->id;
1234
1235         ret = xgene_dma_create_ring_one(chan, tx_ring,
1236                                         XGENE_DMA_RING_CFG_SIZE_64KB);
1237         if (ret) {
1238                 xgene_dma_delete_ring_one(rx_ring);
1239                 return ret;
1240         }
1241
1242         tx_ring->dst_ring_num = XGENE_DMA_RING_DST_ID(rx_ring->num);
1243
1244         chan_dbg(chan,
1245                  "Tx ring id 0x%X num %d desc 0x%p\n",
1246                  tx_ring->id, tx_ring->num, tx_ring->desc_vaddr);
1247
1248         /* Set the max outstanding request possible to this channel */
1249         chan->max_outstanding = tx_ring->slots;
1250
1251         return ret;
1252 }
1253
1254 static int xgene_dma_init_rings(struct xgene_dma *pdma)
1255 {
1256         int ret, i, j;
1257
1258         for (i = 0; i < XGENE_DMA_MAX_CHANNEL; i++) {
1259                 ret = xgene_dma_create_chan_rings(&pdma->chan[i]);
1260                 if (ret) {
1261                         for (j = 0; j < i; j++)
1262                                 xgene_dma_delete_chan_rings(&pdma->chan[j]);
1263                         return ret;
1264                 }
1265         }
1266
1267         return ret;
1268 }
1269
1270 static void xgene_dma_enable(struct xgene_dma *pdma)
1271 {
1272         u32 val;
1273
1274         /* Configure and enable DMA engine */
1275         val = ioread32(pdma->csr_dma + XGENE_DMA_GCR);
1276         XGENE_DMA_CH_SETUP(val);
1277         XGENE_DMA_ENABLE(val);
1278         iowrite32(val, pdma->csr_dma + XGENE_DMA_GCR);
1279 }
1280
1281 static void xgene_dma_disable(struct xgene_dma *pdma)
1282 {
1283         u32 val;
1284
1285         val = ioread32(pdma->csr_dma + XGENE_DMA_GCR);
1286         XGENE_DMA_DISABLE(val);
1287         iowrite32(val, pdma->csr_dma + XGENE_DMA_GCR);
1288 }
1289
1290 static void xgene_dma_mask_interrupts(struct xgene_dma *pdma)
1291 {
1292         /*
1293          * Mask DMA ring overflow, underflow and
1294          * AXI write/read error interrupts
1295          */
1296         iowrite32(XGENE_DMA_INT_ALL_MASK,
1297                   pdma->csr_dma + XGENE_DMA_RING_INT0_MASK);
1298         iowrite32(XGENE_DMA_INT_ALL_MASK,
1299                   pdma->csr_dma + XGENE_DMA_RING_INT1_MASK);
1300         iowrite32(XGENE_DMA_INT_ALL_MASK,
1301                   pdma->csr_dma + XGENE_DMA_RING_INT2_MASK);
1302         iowrite32(XGENE_DMA_INT_ALL_MASK,
1303                   pdma->csr_dma + XGENE_DMA_RING_INT3_MASK);
1304         iowrite32(XGENE_DMA_INT_ALL_MASK,
1305                   pdma->csr_dma + XGENE_DMA_RING_INT4_MASK);
1306
1307         /* Mask DMA error interrupts */
1308         iowrite32(XGENE_DMA_INT_ALL_MASK, pdma->csr_dma + XGENE_DMA_INT_MASK);
1309 }
1310
1311 static void xgene_dma_unmask_interrupts(struct xgene_dma *pdma)
1312 {
1313         /*
1314          * Unmask DMA ring overflow, underflow and
1315          * AXI write/read error interrupts
1316          */
1317         iowrite32(XGENE_DMA_INT_ALL_UNMASK,
1318                   pdma->csr_dma + XGENE_DMA_RING_INT0_MASK);
1319         iowrite32(XGENE_DMA_INT_ALL_UNMASK,
1320                   pdma->csr_dma + XGENE_DMA_RING_INT1_MASK);
1321         iowrite32(XGENE_DMA_INT_ALL_UNMASK,
1322                   pdma->csr_dma + XGENE_DMA_RING_INT2_MASK);
1323         iowrite32(XGENE_DMA_INT_ALL_UNMASK,
1324                   pdma->csr_dma + XGENE_DMA_RING_INT3_MASK);
1325         iowrite32(XGENE_DMA_INT_ALL_UNMASK,
1326                   pdma->csr_dma + XGENE_DMA_RING_INT4_MASK);
1327
1328         /* Unmask DMA error interrupts */
1329         iowrite32(XGENE_DMA_INT_ALL_UNMASK,
1330                   pdma->csr_dma + XGENE_DMA_INT_MASK);
1331 }
1332
1333 static void xgene_dma_init_hw(struct xgene_dma *pdma)
1334 {
1335         u32 val;
1336
1337         /* Associate DMA ring to corresponding ring HW */
1338         iowrite32(XGENE_DMA_ASSOC_RING_MNGR1,
1339                   pdma->csr_dma + XGENE_DMA_CFG_RING_WQ_ASSOC);
1340
1341         /* Configure RAID6 polynomial control setting */
1342         if (is_pq_enabled(pdma))
1343                 iowrite32(XGENE_DMA_RAID6_MULTI_CTRL(0x1D),
1344                           pdma->csr_dma + XGENE_DMA_RAID6_CONT);
1345         else
1346                 dev_info(pdma->dev, "PQ is disabled in HW\n");
1347
1348         xgene_dma_enable(pdma);
1349         xgene_dma_unmask_interrupts(pdma);
1350
1351         /* Get DMA id and version info */
1352         val = ioread32(pdma->csr_dma + XGENE_DMA_IPBRR);
1353
1354         /* DMA device info */
1355         dev_info(pdma->dev,
1356                  "X-Gene DMA v%d.%02d.%02d driver registered %d channels",
1357                  XGENE_DMA_REV_NO_RD(val), XGENE_DMA_BUS_ID_RD(val),
1358                  XGENE_DMA_DEV_ID_RD(val), XGENE_DMA_MAX_CHANNEL);
1359 }
1360
1361 static int xgene_dma_init_ring_mngr(struct xgene_dma *pdma)
1362 {
1363         if (ioread32(pdma->csr_ring + XGENE_DMA_RING_CLKEN) &&
1364             (!ioread32(pdma->csr_ring + XGENE_DMA_RING_SRST)))
1365                 return 0;
1366
1367         iowrite32(0x3, pdma->csr_ring + XGENE_DMA_RING_CLKEN);
1368         iowrite32(0x0, pdma->csr_ring + XGENE_DMA_RING_SRST);
1369
1370         /* Bring up memory */
1371         iowrite32(0x0, pdma->csr_ring + XGENE_DMA_RING_MEM_RAM_SHUTDOWN);
1372
1373         /* Force a barrier */
1374         ioread32(pdma->csr_ring + XGENE_DMA_RING_MEM_RAM_SHUTDOWN);
1375
1376         /* reset may take up to 1ms */
1377         usleep_range(1000, 1100);
1378
1379         if (ioread32(pdma->csr_ring + XGENE_DMA_RING_BLK_MEM_RDY)
1380                 != XGENE_DMA_RING_BLK_MEM_RDY_VAL) {
1381                 dev_err(pdma->dev,
1382                         "Failed to release ring mngr memory from shutdown\n");
1383                 return -ENODEV;
1384         }
1385
1386         /* program threshold set 1 and all hysteresis */
1387         iowrite32(XGENE_DMA_RING_THRESLD0_SET1_VAL,
1388                   pdma->csr_ring + XGENE_DMA_RING_THRESLD0_SET1);
1389         iowrite32(XGENE_DMA_RING_THRESLD1_SET1_VAL,
1390                   pdma->csr_ring + XGENE_DMA_RING_THRESLD1_SET1);
1391         iowrite32(XGENE_DMA_RING_HYSTERESIS_VAL,
1392                   pdma->csr_ring + XGENE_DMA_RING_HYSTERESIS);
1393
1394         /* Enable QPcore and assign error queue */
1395         iowrite32(XGENE_DMA_RING_ENABLE,
1396                   pdma->csr_ring + XGENE_DMA_RING_CONFIG);
1397
1398         return 0;
1399 }
1400
1401 static int xgene_dma_init_mem(struct xgene_dma *pdma)
1402 {
1403         int ret;
1404
1405         ret = xgene_dma_init_ring_mngr(pdma);
1406         if (ret)
1407                 return ret;
1408
1409         /* Bring up memory */
1410         iowrite32(0x0, pdma->csr_dma + XGENE_DMA_MEM_RAM_SHUTDOWN);
1411
1412         /* Force a barrier */
1413         ioread32(pdma->csr_dma + XGENE_DMA_MEM_RAM_SHUTDOWN);
1414
1415         /* reset may take up to 1ms */
1416         usleep_range(1000, 1100);
1417
1418         if (ioread32(pdma->csr_dma + XGENE_DMA_BLK_MEM_RDY)
1419                 != XGENE_DMA_BLK_MEM_RDY_VAL) {
1420                 dev_err(pdma->dev,
1421                         "Failed to release DMA memory from shutdown\n");
1422                 return -ENODEV;
1423         }
1424
1425         return 0;
1426 }
1427
1428 static int xgene_dma_request_irqs(struct xgene_dma *pdma)
1429 {
1430         struct xgene_dma_chan *chan;
1431         int ret, i, j;
1432
1433         /* Register DMA error irq */
1434         ret = devm_request_irq(pdma->dev, pdma->err_irq, xgene_dma_err_isr,
1435                                0, "dma_error", pdma);
1436         if (ret) {
1437                 dev_err(pdma->dev,
1438                         "Failed to register error IRQ %d\n", pdma->err_irq);
1439                 return ret;
1440         }
1441
1442         /* Register DMA channel rx irq */
1443         for (i = 0; i < XGENE_DMA_MAX_CHANNEL; i++) {
1444                 chan = &pdma->chan[i];
1445                 irq_set_status_flags(chan->rx_irq, IRQ_DISABLE_UNLAZY);
1446                 ret = devm_request_irq(chan->dev, chan->rx_irq,
1447                                        xgene_dma_chan_ring_isr,
1448                                        0, chan->name, chan);
1449                 if (ret) {
1450                         chan_err(chan, "Failed to register Rx IRQ %d\n",
1451                                  chan->rx_irq);
1452                         devm_free_irq(pdma->dev, pdma->err_irq, pdma);
1453
1454                         for (j = 0; j < i; j++) {
1455                                 chan = &pdma->chan[i];
1456                                 irq_clear_status_flags(chan->rx_irq, IRQ_DISABLE_UNLAZY);
1457                                 devm_free_irq(chan->dev, chan->rx_irq, chan);
1458                         }
1459
1460                         return ret;
1461                 }
1462         }
1463
1464         return 0;
1465 }
1466
1467 static void xgene_dma_free_irqs(struct xgene_dma *pdma)
1468 {
1469         struct xgene_dma_chan *chan;
1470         int i;
1471
1472         /* Free DMA device error irq */
1473         devm_free_irq(pdma->dev, pdma->err_irq, pdma);
1474
1475         for (i = 0; i < XGENE_DMA_MAX_CHANNEL; i++) {
1476                 chan = &pdma->chan[i];
1477                 irq_clear_status_flags(chan->rx_irq, IRQ_DISABLE_UNLAZY);
1478                 devm_free_irq(chan->dev, chan->rx_irq, chan);
1479         }
1480 }
1481
1482 static void xgene_dma_set_caps(struct xgene_dma_chan *chan,
1483                                struct dma_device *dma_dev)
1484 {
1485         /* Initialize DMA device capability mask */
1486         dma_cap_zero(dma_dev->cap_mask);
1487
1488         /* Set DMA device capability */
1489
1490         /* Basically here, the X-Gene SoC DMA engine channel 0 supports XOR
1491          * and channel 1 supports XOR, PQ both. First thing here is we have
1492          * mechanism in hw to enable/disable PQ/XOR supports on channel 1,
1493          * we can make sure this by reading SoC Efuse register.
1494          * Second thing, we have hw errata that if we run channel 0 and
1495          * channel 1 simultaneously with executing XOR and PQ request,
1496          * suddenly DMA engine hangs, So here we enable XOR on channel 0 only
1497          * if XOR and PQ supports on channel 1 is disabled.
1498          */
1499         if ((chan->id == XGENE_DMA_PQ_CHANNEL) &&
1500             is_pq_enabled(chan->pdma)) {
1501                 dma_cap_set(DMA_PQ, dma_dev->cap_mask);
1502                 dma_cap_set(DMA_XOR, dma_dev->cap_mask);
1503         } else if ((chan->id == XGENE_DMA_XOR_CHANNEL) &&
1504                    !is_pq_enabled(chan->pdma)) {
1505                 dma_cap_set(DMA_XOR, dma_dev->cap_mask);
1506         }
1507
1508         /* Set base and prep routines */
1509         dma_dev->dev = chan->dev;
1510         dma_dev->device_alloc_chan_resources = xgene_dma_alloc_chan_resources;
1511         dma_dev->device_free_chan_resources = xgene_dma_free_chan_resources;
1512         dma_dev->device_issue_pending = xgene_dma_issue_pending;
1513         dma_dev->device_tx_status = xgene_dma_tx_status;
1514
1515         if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) {
1516                 dma_dev->device_prep_dma_xor = xgene_dma_prep_xor;
1517                 dma_dev->max_xor = XGENE_DMA_MAX_XOR_SRC;
1518                 dma_dev->xor_align = DMAENGINE_ALIGN_64_BYTES;
1519         }
1520
1521         if (dma_has_cap(DMA_PQ, dma_dev->cap_mask)) {
1522                 dma_dev->device_prep_dma_pq = xgene_dma_prep_pq;
1523                 dma_dev->max_pq = XGENE_DMA_MAX_XOR_SRC;
1524                 dma_dev->pq_align = DMAENGINE_ALIGN_64_BYTES;
1525         }
1526 }
1527
1528 static int xgene_dma_async_register(struct xgene_dma *pdma, int id)
1529 {
1530         struct xgene_dma_chan *chan = &pdma->chan[id];
1531         struct dma_device *dma_dev = &pdma->dma_dev[id];
1532         int ret;
1533
1534         chan->dma_chan.device = dma_dev;
1535
1536         spin_lock_init(&chan->lock);
1537         INIT_LIST_HEAD(&chan->ld_pending);
1538         INIT_LIST_HEAD(&chan->ld_running);
1539         INIT_LIST_HEAD(&chan->ld_completed);
1540         tasklet_init(&chan->tasklet, xgene_dma_tasklet_cb,
1541                      (unsigned long)chan);
1542
1543         chan->pending = 0;
1544         chan->desc_pool = NULL;
1545         dma_cookie_init(&chan->dma_chan);
1546
1547         /* Setup dma device capabilities and prep routines */
1548         xgene_dma_set_caps(chan, dma_dev);
1549
1550         /* Initialize DMA device list head */
1551         INIT_LIST_HEAD(&dma_dev->channels);
1552         list_add_tail(&chan->dma_chan.device_node, &dma_dev->channels);
1553
1554         /* Register with Linux async DMA framework*/
1555         ret = dma_async_device_register(dma_dev);
1556         if (ret) {
1557                 chan_err(chan, "Failed to register async device %d", ret);
1558                 tasklet_kill(&chan->tasklet);
1559
1560                 return ret;
1561         }
1562
1563         /* DMA capability info */
1564         dev_info(pdma->dev,
1565                  "%s: CAPABILITY ( %s%s)\n", dma_chan_name(&chan->dma_chan),
1566                  dma_has_cap(DMA_XOR, dma_dev->cap_mask) ? "XOR " : "",
1567                  dma_has_cap(DMA_PQ, dma_dev->cap_mask) ? "PQ " : "");
1568
1569         return 0;
1570 }
1571
1572 static int xgene_dma_init_async(struct xgene_dma *pdma)
1573 {
1574         int ret, i, j;
1575
1576         for (i = 0; i < XGENE_DMA_MAX_CHANNEL ; i++) {
1577                 ret = xgene_dma_async_register(pdma, i);
1578                 if (ret) {
1579                         for (j = 0; j < i; j++) {
1580                                 dma_async_device_unregister(&pdma->dma_dev[j]);
1581                                 tasklet_kill(&pdma->chan[j].tasklet);
1582                         }
1583
1584                         return ret;
1585                 }
1586         }
1587
1588         return ret;
1589 }
1590
1591 static void xgene_dma_async_unregister(struct xgene_dma *pdma)
1592 {
1593         int i;
1594
1595         for (i = 0; i < XGENE_DMA_MAX_CHANNEL; i++)
1596                 dma_async_device_unregister(&pdma->dma_dev[i]);
1597 }
1598
1599 static void xgene_dma_init_channels(struct xgene_dma *pdma)
1600 {
1601         struct xgene_dma_chan *chan;
1602         int i;
1603
1604         pdma->ring_num = XGENE_DMA_RING_NUM;
1605
1606         for (i = 0; i < XGENE_DMA_MAX_CHANNEL; i++) {
1607                 chan = &pdma->chan[i];
1608                 chan->dev = pdma->dev;
1609                 chan->pdma = pdma;
1610                 chan->id = i;
1611                 snprintf(chan->name, sizeof(chan->name), "dmachan%d", chan->id);
1612         }
1613 }
1614
1615 static int xgene_dma_get_resources(struct platform_device *pdev,
1616                                    struct xgene_dma *pdma)
1617 {
1618         struct resource *res;
1619         int irq, i;
1620
1621         /* Get DMA csr region */
1622         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1623         if (!res) {
1624                 dev_err(&pdev->dev, "Failed to get csr region\n");
1625                 return -ENXIO;
1626         }
1627
1628         pdma->csr_dma = devm_ioremap(&pdev->dev, res->start,
1629                                      resource_size(res));
1630         if (!pdma->csr_dma) {
1631                 dev_err(&pdev->dev, "Failed to ioremap csr region");
1632                 return -ENOMEM;
1633         }
1634
1635         /* Get DMA ring csr region */
1636         res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1637         if (!res) {
1638                 dev_err(&pdev->dev, "Failed to get ring csr region\n");
1639                 return -ENXIO;
1640         }
1641
1642         pdma->csr_ring =  devm_ioremap(&pdev->dev, res->start,
1643                                        resource_size(res));
1644         if (!pdma->csr_ring) {
1645                 dev_err(&pdev->dev, "Failed to ioremap ring csr region");
1646                 return -ENOMEM;
1647         }
1648
1649         /* Get DMA ring cmd csr region */
1650         res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
1651         if (!res) {
1652                 dev_err(&pdev->dev, "Failed to get ring cmd csr region\n");
1653                 return -ENXIO;
1654         }
1655
1656         pdma->csr_ring_cmd = devm_ioremap(&pdev->dev, res->start,
1657                                           resource_size(res));
1658         if (!pdma->csr_ring_cmd) {
1659                 dev_err(&pdev->dev, "Failed to ioremap ring cmd csr region");
1660                 return -ENOMEM;
1661         }
1662
1663         pdma->csr_ring_cmd += XGENE_DMA_RING_CMD_SM_OFFSET;
1664
1665         /* Get efuse csr region */
1666         res = platform_get_resource(pdev, IORESOURCE_MEM, 3);
1667         if (!res) {
1668                 dev_err(&pdev->dev, "Failed to get efuse csr region\n");
1669                 return -ENXIO;
1670         }
1671
1672         pdma->csr_efuse = devm_ioremap(&pdev->dev, res->start,
1673                                        resource_size(res));
1674         if (!pdma->csr_efuse) {
1675                 dev_err(&pdev->dev, "Failed to ioremap efuse csr region");
1676                 return -ENOMEM;
1677         }
1678
1679         /* Get DMA error interrupt */
1680         irq = platform_get_irq(pdev, 0);
1681         if (irq <= 0)
1682                 return -ENXIO;
1683
1684         pdma->err_irq = irq;
1685
1686         /* Get DMA Rx ring descriptor interrupts for all DMA channels */
1687         for (i = 1; i <= XGENE_DMA_MAX_CHANNEL; i++) {
1688                 irq = platform_get_irq(pdev, i);
1689                 if (irq <= 0)
1690                         return -ENXIO;
1691
1692                 pdma->chan[i - 1].rx_irq = irq;
1693         }
1694
1695         return 0;
1696 }
1697
1698 static int xgene_dma_probe(struct platform_device *pdev)
1699 {
1700         struct xgene_dma *pdma;
1701         int ret, i;
1702
1703         pdma = devm_kzalloc(&pdev->dev, sizeof(*pdma), GFP_KERNEL);
1704         if (!pdma)
1705                 return -ENOMEM;
1706
1707         pdma->dev = &pdev->dev;
1708         platform_set_drvdata(pdev, pdma);
1709
1710         ret = xgene_dma_get_resources(pdev, pdma);
1711         if (ret)
1712                 return ret;
1713
1714         pdma->clk = devm_clk_get(&pdev->dev, NULL);
1715         if (IS_ERR(pdma->clk) && !ACPI_COMPANION(&pdev->dev)) {
1716                 dev_err(&pdev->dev, "Failed to get clk\n");
1717                 return PTR_ERR(pdma->clk);
1718         }
1719
1720         /* Enable clk before accessing registers */
1721         if (!IS_ERR(pdma->clk)) {
1722                 ret = clk_prepare_enable(pdma->clk);
1723                 if (ret) {
1724                         dev_err(&pdev->dev, "Failed to enable clk %d\n", ret);
1725                         return ret;
1726                 }
1727         }
1728
1729         /* Remove DMA RAM out of shutdown */
1730         ret = xgene_dma_init_mem(pdma);
1731         if (ret)
1732                 goto err_clk_enable;
1733
1734         ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(42));
1735         if (ret) {
1736                 dev_err(&pdev->dev, "No usable DMA configuration\n");
1737                 goto err_dma_mask;
1738         }
1739
1740         /* Initialize DMA channels software state */
1741         xgene_dma_init_channels(pdma);
1742
1743         /* Configue DMA rings */
1744         ret = xgene_dma_init_rings(pdma);
1745         if (ret)
1746                 goto err_clk_enable;
1747
1748         ret = xgene_dma_request_irqs(pdma);
1749         if (ret)
1750                 goto err_request_irq;
1751
1752         /* Configure and enable DMA engine */
1753         xgene_dma_init_hw(pdma);
1754
1755         /* Register DMA device with linux async framework */
1756         ret = xgene_dma_init_async(pdma);
1757         if (ret)
1758                 goto err_async_init;
1759
1760         return 0;
1761
1762 err_async_init:
1763         xgene_dma_free_irqs(pdma);
1764
1765 err_request_irq:
1766         for (i = 0; i < XGENE_DMA_MAX_CHANNEL; i++)
1767                 xgene_dma_delete_chan_rings(&pdma->chan[i]);
1768
1769 err_dma_mask:
1770 err_clk_enable:
1771         if (!IS_ERR(pdma->clk))
1772                 clk_disable_unprepare(pdma->clk);
1773
1774         return ret;
1775 }
1776
1777 static int xgene_dma_remove(struct platform_device *pdev)
1778 {
1779         struct xgene_dma *pdma = platform_get_drvdata(pdev);
1780         struct xgene_dma_chan *chan;
1781         int i;
1782
1783         xgene_dma_async_unregister(pdma);
1784
1785         /* Mask interrupts and disable DMA engine */
1786         xgene_dma_mask_interrupts(pdma);
1787         xgene_dma_disable(pdma);
1788         xgene_dma_free_irqs(pdma);
1789
1790         for (i = 0; i < XGENE_DMA_MAX_CHANNEL; i++) {
1791                 chan = &pdma->chan[i];
1792                 tasklet_kill(&chan->tasklet);
1793                 xgene_dma_delete_chan_rings(chan);
1794         }
1795
1796         if (!IS_ERR(pdma->clk))
1797                 clk_disable_unprepare(pdma->clk);
1798
1799         return 0;
1800 }
1801
1802 #ifdef CONFIG_ACPI
1803 static const struct acpi_device_id xgene_dma_acpi_match_ptr[] = {
1804         {"APMC0D43", 0},
1805         {},
1806 };
1807 MODULE_DEVICE_TABLE(acpi, xgene_dma_acpi_match_ptr);
1808 #endif
1809
1810 static const struct of_device_id xgene_dma_of_match_ptr[] = {
1811         {.compatible = "apm,xgene-storm-dma",},
1812         {},
1813 };
1814 MODULE_DEVICE_TABLE(of, xgene_dma_of_match_ptr);
1815
1816 static struct platform_driver xgene_dma_driver = {
1817         .probe = xgene_dma_probe,
1818         .remove = xgene_dma_remove,
1819         .driver = {
1820                 .name = "X-Gene-DMA",
1821                 .of_match_table = xgene_dma_of_match_ptr,
1822                 .acpi_match_table = ACPI_PTR(xgene_dma_acpi_match_ptr),
1823         },
1824 };
1825
1826 module_platform_driver(xgene_dma_driver);
1827
1828 MODULE_DESCRIPTION("APM X-Gene SoC DMA driver");
1829 MODULE_AUTHOR("Rameshwar Prasad Sahu <rsahu@apm.com>");
1830 MODULE_AUTHOR("Loc Ho <lho@apm.com>");
1831 MODULE_LICENSE("GPL");
1832 MODULE_VERSION("1.0");