drivers/dma/dw/regs.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Driver for the Synopsys DesignWare AHB DMA Controller
   4  *
   5  * Copyright (C) 2005-2007 Atmel Corporation
   6  * Copyright (C) 2010-2011 ST Microelectronics
   7  * Copyright (C) 2016 Intel Corporation
   8  */
   9
  10 #include <linux/bitops.h>
  11 #include <linux/interrupt.h>
  12 #include <linux/dmaengine.h>
  13
  14 #include <linux/io-64-nonatomic-hi-lo.h>
  15
  16 #include "internal.h"
  17
  18 #define DW_DMA_MAX_NR_REQUESTS  16
  19
  20 /* flow controller */
  21 enum dw_dma_fc {
  22         DW_DMA_FC_D_M2M,
  23         DW_DMA_FC_D_M2P,
  24         DW_DMA_FC_D_P2M,
  25         DW_DMA_FC_D_P2P,
  26         DW_DMA_FC_P_P2M,
  27         DW_DMA_FC_SP_P2P,
  28         DW_DMA_FC_P_M2P,
  29         DW_DMA_FC_DP_P2P,
  30 };
  31
  32 /*
  33  * Redefine this macro to handle differences between 32- and 64-bit
  34  * addressing, big vs. little endian, etc.
  35  */
  36 #define DW_REG(name)            u32 name; u32 __pad_##name
  37
  38 /* Hardware register definitions. */
  39 struct dw_dma_chan_regs {
  40         DW_REG(SAR);            /* Source Address Register */
  41         DW_REG(DAR);            /* Destination Address Register */
  42         DW_REG(LLP);            /* Linked List Pointer */
  43         u32     CTL_LO;         /* Control Register Low */
  44         u32     CTL_HI;         /* Control Register High */
  45         DW_REG(SSTAT);
  46         DW_REG(DSTAT);
  47         DW_REG(SSTATAR);
  48         DW_REG(DSTATAR);
  49         u32     CFG_LO;         /* Configuration Register Low */
  50         u32     CFG_HI;         /* Configuration Register High */
  51         DW_REG(SGR);
  52         DW_REG(DSR);
  53 };
  54
  55 struct dw_dma_irq_regs {
  56         DW_REG(XFER);
  57         DW_REG(BLOCK);
  58         DW_REG(SRC_TRAN);
  59         DW_REG(DST_TRAN);
  60         DW_REG(ERROR);
  61 };
  62
  63 struct dw_dma_regs {
  64         /* per-channel registers */
  65         struct dw_dma_chan_regs CHAN[DW_DMA_MAX_NR_CHANNELS];
  66
  67         /* irq handling */
  68         struct dw_dma_irq_regs  RAW;            /* r */
  69         struct dw_dma_irq_regs  STATUS;         /* r (raw & mask) */
  70         struct dw_dma_irq_regs  MASK;           /* rw (set = irq enabled) */
  71         struct dw_dma_irq_regs  CLEAR;          /* w (ack, affects "raw") */
  72
  73         DW_REG(STATUS_INT);                     /* r */
  74
  75         /* software handshaking */
  76         DW_REG(REQ_SRC);
  77         DW_REG(REQ_DST);
  78         DW_REG(SGL_REQ_SRC);
  79         DW_REG(SGL_REQ_DST);
  80         DW_REG(LAST_SRC);
  81         DW_REG(LAST_DST);
  82
  83         /* miscellaneous */
  84         DW_REG(CFG);
  85         DW_REG(CH_EN);
  86         DW_REG(ID);
  87         DW_REG(TEST);
  88
  89         /* iDMA 32-bit support */
  90         DW_REG(CLASS_PRIORITY0);
  91         DW_REG(CLASS_PRIORITY1);
  92
  93         /* optional encoded params, 0x3c8..0x3f7 */
  94         u32     __reserved;
  95
  96         /* per-channel configuration registers */
  97         u32     DWC_PARAMS[DW_DMA_MAX_NR_CHANNELS];
  98         u32     MULTI_BLK_TYPE;
  99         u32     MAX_BLK_SIZE;
 100
 101         /* top-level parameters */
 102         u32     DW_PARAMS;
 103
 104         /* component ID */
 105         u32     COMP_TYPE;
 106         u32     COMP_VERSION;
 107
 108         /* iDMA 32-bit support */
 109         DW_REG(FIFO_PARTITION0);
 110         DW_REG(FIFO_PARTITION1);
 111
 112         DW_REG(SAI_ERR);
 113         DW_REG(GLOBAL_CFG);
 114 };
 115
 116 /* Bitfields in DW_PARAMS */
 117 #define DW_PARAMS_NR_CHAN       8               /* number of channels */
 118 #define DW_PARAMS_NR_MASTER     11              /* number of AHB masters */
 119 #define DW_PARAMS_DATA_WIDTH(n) (15 + 2 * (n))
 120 #define DW_PARAMS_DATA_WIDTH1   15              /* master 1 data width */
 121 #define DW_PARAMS_DATA_WIDTH2   17              /* master 2 data width */
 122 #define DW_PARAMS_DATA_WIDTH3   19              /* master 3 data width */
 123 #define DW_PARAMS_DATA_WIDTH4   21              /* master 4 data width */
 124 #define DW_PARAMS_EN            28              /* encoded parameters */
 125
 126 /* Bitfields in DWC_PARAMS */
 127 #define DWC_PARAMS_MBLK_EN      11              /* multi block transfer */
 128 #define DWC_PARAMS_HC_LLP       13              /* set LLP register to zero */
 129 #define DWC_PARAMS_MSIZE        16              /* max group transaction size */
 130
 131 /* bursts size */
 132 enum dw_dma_msize {
 133         DW_DMA_MSIZE_1,
 134         DW_DMA_MSIZE_4,
 135         DW_DMA_MSIZE_8,
 136         DW_DMA_MSIZE_16,
 137         DW_DMA_MSIZE_32,
 138         DW_DMA_MSIZE_64,
 139         DW_DMA_MSIZE_128,
 140         DW_DMA_MSIZE_256,
 141 };
 142
 143 /* Bitfields in LLP */
 144 #define DWC_LLP_LMS(x)          ((x) & 3)       /* list master select */
 145 #define DWC_LLP_LOC(x)          ((x) & ~3)      /* next lli */
 146
 147 /* Bitfields in CTL_LO */
 148 #define DWC_CTLL_INT_EN         (1 << 0)        /* irqs enabled? */
 149 #define DWC_CTLL_DST_WIDTH(n)   ((n)<<1)        /* bytes per element */
 150 #define DWC_CTLL_SRC_WIDTH(n)   ((n)<<4)
 151 #define DWC_CTLL_DST_INC        (0<<7)          /* DAR update/not */
 152 #define DWC_CTLL_DST_DEC        (1<<7)
 153 #define DWC_CTLL_DST_FIX        (2<<7)
 154 #define DWC_CTLL_SRC_INC        (0<<9)          /* SAR update/not */
 155 #define DWC_CTLL_SRC_DEC        (1<<9)
 156 #define DWC_CTLL_SRC_FIX        (2<<9)
 157 #define DWC_CTLL_DST_MSIZE(n)   ((n)<<11)       /* burst, #elements */
 158 #define DWC_CTLL_SRC_MSIZE(n)   ((n)<<14)
 159 #define DWC_CTLL_S_GATH_EN      (1 << 17)       /* src gather, !FIX */
 160 #define DWC_CTLL_D_SCAT_EN      (1 << 18)       /* dst scatter, !FIX */
 161 #define DWC_CTLL_FC(n)          ((n) << 20)
 162 #define DWC_CTLL_FC_M2M         (0 << 20)       /* mem-to-mem */
 163 #define DWC_CTLL_FC_M2P         (1 << 20)       /* mem-to-periph */
 164 #define DWC_CTLL_FC_P2M         (2 << 20)       /* periph-to-mem */
 165 #define DWC_CTLL_FC_P2P         (3 << 20)       /* periph-to-periph */
 166 /* plus 4 transfer types for peripheral-as-flow-controller */
 167 #define DWC_CTLL_DMS(n)         ((n)<<23)       /* dst master select */
 168 #define DWC_CTLL_SMS(n)         ((n)<<25)       /* src master select */
 169 #define DWC_CTLL_LLP_D_EN       (1 << 27)       /* dest block chain */
 170 #define DWC_CTLL_LLP_S_EN       (1 << 28)       /* src block chain */
 171
 172 /* Bitfields in CTL_HI */
 173 #define DWC_CTLH_BLOCK_TS_MASK  GENMASK(11, 0)
 174 #define DWC_CTLH_BLOCK_TS(x)    ((x) & DWC_CTLH_BLOCK_TS_MASK)
 175 #define DWC_CTLH_DONE           (1 << 12)
 176
 177 /* Bitfields in CFG_LO */
 178 #define DWC_CFGL_CH_PRIOR_MASK  (0x7 << 5)      /* priority mask */
 179 #define DWC_CFGL_CH_PRIOR(x)    ((x) << 5)      /* priority */
 180 #define DWC_CFGL_CH_SUSP        (1 << 8)        /* pause xfer */
 181 #define DWC_CFGL_FIFO_EMPTY     (1 << 9)        /* pause xfer */
 182 #define DWC_CFGL_HS_DST         (1 << 10)       /* handshake w/dst */
 183 #define DWC_CFGL_HS_SRC         (1 << 11)       /* handshake w/src */
 184 #define DWC_CFGL_LOCK_CH_XFER   (0 << 12)       /* scope of LOCK_CH */
 185 #define DWC_CFGL_LOCK_CH_BLOCK  (1 << 12)
 186 #define DWC_CFGL_LOCK_CH_XACT   (2 << 12)
 187 #define DWC_CFGL_LOCK_BUS_XFER  (0 << 14)       /* scope of LOCK_BUS */
 188 #define DWC_CFGL_LOCK_BUS_BLOCK (1 << 14)
 189 #define DWC_CFGL_LOCK_BUS_XACT  (2 << 14)
 190 #define DWC_CFGL_LOCK_CH        (1 << 15)       /* channel lockout */
 191 #define DWC_CFGL_LOCK_BUS       (1 << 16)       /* busmaster lockout */
 192 #define DWC_CFGL_HS_DST_POL     (1 << 18)       /* dst handshake active low */
 193 #define DWC_CFGL_HS_SRC_POL     (1 << 19)       /* src handshake active low */
 194 #define DWC_CFGL_MAX_BURST(x)   ((x) << 20)
 195 #define DWC_CFGL_RELOAD_SAR     (1 << 30)
 196 #define DWC_CFGL_RELOAD_DAR     (1 << 31)
 197
 198 /* Bitfields in CFG_HI */
 199 #define DWC_CFGH_FCMODE         (1 << 0)
 200 #define DWC_CFGH_FIFO_MODE      (1 << 1)
 201 #define DWC_CFGH_PROTCTL(x)     ((x) << 2)
 202 #define DWC_CFGH_PROTCTL_DATA   (0 << 2)        /* data access - always set */
 203 #define DWC_CFGH_PROTCTL_PRIV   (1 << 2)        /* privileged -> AHB HPROT[1] */
 204 #define DWC_CFGH_PROTCTL_BUFFER (2 << 2)        /* bufferable -> AHB HPROT[2] */
 205 #define DWC_CFGH_PROTCTL_CACHE  (4 << 2)        /* cacheable  -> AHB HPROT[3] */
 206 #define DWC_CFGH_DS_UPD_EN      (1 << 5)
 207 #define DWC_CFGH_SS_UPD_EN      (1 << 6)
 208 #define DWC_CFGH_SRC_PER(x)     ((x) << 7)
 209 #define DWC_CFGH_DST_PER(x)     ((x) << 11)
 210
 211 /* Bitfields in SGR */
 212 #define DWC_SGR_SGI(x)          ((x) << 0)
 213 #define DWC_SGR_SGC(x)          ((x) << 20)
 214
 215 /* Bitfields in DSR */
 216 #define DWC_DSR_DSI(x)          ((x) << 0)
 217 #define DWC_DSR_DSC(x)          ((x) << 20)
 218
 219 /* Bitfields in CFG */
 220 #define DW_CFG_DMA_EN           (1 << 0)
 221
 222 /* iDMA 32-bit support */
 223
 224 /* bursts size */
 225 enum idma32_msize {
 226         IDMA32_MSIZE_1,
 227         IDMA32_MSIZE_2,
 228         IDMA32_MSIZE_4,
 229         IDMA32_MSIZE_8,
 230         IDMA32_MSIZE_16,
 231         IDMA32_MSIZE_32,
 232 };
 233
 234 /* Bitfields in CTL_HI */
 235 #define IDMA32C_CTLH_BLOCK_TS_MASK      GENMASK(16, 0)
 236 #define IDMA32C_CTLH_BLOCK_TS(x)        ((x) & IDMA32C_CTLH_BLOCK_TS_MASK)
 237 #define IDMA32C_CTLH_DONE               (1 << 17)
 238
 239 /* Bitfields in CFG_LO */
 240 #define IDMA32C_CFGL_DST_BURST_ALIGN    (1 << 0)        /* dst burst align */
 241 #define IDMA32C_CFGL_SRC_BURST_ALIGN    (1 << 1)        /* src burst align */
 242 #define IDMA32C_CFGL_CH_DRAIN           (1 << 10)       /* drain FIFO */
 243 #define IDMA32C_CFGL_DST_OPT_BL         (1 << 20)       /* optimize dst burst length */
 244 #define IDMA32C_CFGL_SRC_OPT_BL         (1 << 21)       /* optimize src burst length */
 245
 246 /* Bitfields in CFG_HI */
 247 #define IDMA32C_CFGH_SRC_PER(x)         ((x) << 0)
 248 #define IDMA32C_CFGH_DST_PER(x)         ((x) << 4)
 249 #define IDMA32C_CFGH_RD_ISSUE_THD(x)    ((x) << 8)
 250 #define IDMA32C_CFGH_RW_ISSUE_THD(x)    ((x) << 18)
 251 #define IDMA32C_CFGH_SRC_PER_EXT(x)     ((x) << 28)     /* src peripheral extension */
 252 #define IDMA32C_CFGH_DST_PER_EXT(x)     ((x) << 30)     /* dst peripheral extension */
 253
 254 /* Bitfields in FIFO_PARTITION */
 255 #define IDMA32C_FP_PSIZE_CH0(x)         ((x) << 0)
 256 #define IDMA32C_FP_PSIZE_CH1(x)         ((x) << 13)
 257 #define IDMA32C_FP_UPDATE               (1 << 26)
 258
 259 enum dw_dmac_flags {
 260         DW_DMA_IS_CYCLIC = 0,
 261         DW_DMA_IS_SOFT_LLP = 1,
 262         DW_DMA_IS_PAUSED = 2,
 263         DW_DMA_IS_INITIALIZED = 3,
 264 };
 265
 266 struct dw_dma_chan {
 267         struct dma_chan                 chan;
 268         void __iomem                    *ch_regs;
 269         u8                              mask;
 270         u8                              priority;
 271         enum dma_transfer_direction     direction;
 272
 273         /* software emulation of the LLP transfers */
 274         struct list_head        *tx_node_active;
 275
 276         spinlock_t              lock;
 277
 278         /* these other elements are all protected by lock */
 279         unsigned long           flags;
 280         struct list_head        active_list;
 281         struct list_head        queue;
 282
 283         unsigned int            descs_allocated;
 284
 285         /* hardware configuration */
 286         unsigned int            block_size;
 287         bool                    nollp;
 288         u32                     max_burst;
 289
 290         /* custom slave configuration */
 291         struct dw_dma_slave     dws;
 292
 293         /* configuration passed via .device_config */
 294         struct dma_slave_config dma_sconfig;
 295 };
 296
 297 static inline struct dw_dma_chan_regs __iomem *
 298 __dwc_regs(struct dw_dma_chan *dwc)
 299 {
 300         return dwc->ch_regs;
 301 }
 302
 303 #define channel_readl(dwc, name) \
 304         readl(&(__dwc_regs(dwc)->name))
 305 #define channel_writel(dwc, name, val) \
 306         writel((val), &(__dwc_regs(dwc)->name))
 307
 308 static inline struct dw_dma_chan *to_dw_dma_chan(struct dma_chan *chan)
 309 {
 310         return container_of(chan, struct dw_dma_chan, chan);
 311 }
 312
 313 struct dw_dma {
 314         struct dma_device       dma;
 315         char                    name[20];
 316         void __iomem            *regs;
 317         struct dma_pool         *desc_pool;
 318         struct tasklet_struct   tasklet;
 319
 320         /* channels */
 321         struct dw_dma_chan      *chan;
 322         u8                      all_chan_mask;
 323         u8                      in_use;
 324
 325         /* Channel operations */
 326         void    (*initialize_chan)(struct dw_dma_chan *dwc);
 327         void    (*suspend_chan)(struct dw_dma_chan *dwc, bool drain);
 328         void    (*resume_chan)(struct dw_dma_chan *dwc, bool drain);
 329         u32     (*prepare_ctllo)(struct dw_dma_chan *dwc);
 330         void    (*encode_maxburst)(struct dw_dma_chan *dwc, u32 *maxburst);
 331         u32     (*bytes2block)(struct dw_dma_chan *dwc, size_t bytes,
 332                                unsigned int width, size_t *len);
 333         size_t  (*block2bytes)(struct dw_dma_chan *dwc, u32 block, u32 width);
 334
 335         /* Device operations */
 336         void (*set_device_name)(struct dw_dma *dw, int id);
 337         void (*disable)(struct dw_dma *dw);
 338         void (*enable)(struct dw_dma *dw);
 339
 340         /* platform data */
 341         struct dw_dma_platform_data     *pdata;
 342 };
 343
 344 static inline struct dw_dma_regs __iomem *__dw_regs(struct dw_dma *dw)
 345 {
 346         return dw->regs;
 347 }
 348
 349 #define dma_readl(dw, name) \
 350         readl(&(__dw_regs(dw)->name))
 351 #define dma_writel(dw, name, val) \
 352         writel((val), &(__dw_regs(dw)->name))
 353
 354 #define idma32_readq(dw, name)                          \
 355         hi_lo_readq(&(__dw_regs(dw)->name))
 356 #define idma32_writeq(dw, name, val)                    \
 357         hi_lo_writeq((val), &(__dw_regs(dw)->name))
 358
 359 #define channel_set_bit(dw, reg, mask) \
 360         dma_writel(dw, reg, ((mask) << 8) | (mask))
 361 #define channel_clear_bit(dw, reg, mask) \
 362         dma_writel(dw, reg, ((mask) << 8) | 0)
 363
 364 static inline struct dw_dma *to_dw_dma(struct dma_device *ddev)
 365 {
 366         return container_of(ddev, struct dw_dma, dma);
 367 }
 368
 369 /* LLI == Linked List Item; a.k.a. DMA block descriptor */
 370 struct dw_lli {
 371         /* values that are not changed by hardware */
 372         __le32          sar;
 373         __le32          dar;
 374         __le32          llp;            /* chain to next lli */
 375         __le32          ctllo;
 376         /* values that may get written back: */
 377         __le32          ctlhi;
 378         /* sstat and dstat can snapshot peripheral register state.
 379          * silicon config may discard either or both...
 380          */
 381         __le32          sstat;
 382         __le32          dstat;
 383 };
 384
 385 struct dw_desc {
 386         /* FIRST values the hardware uses */
 387         struct dw_lli                   lli;
 388
 389 #define lli_set(d, reg, v)              ((d)->lli.reg |= cpu_to_le32(v))
 390 #define lli_clear(d, reg, v)            ((d)->lli.reg &= ~cpu_to_le32(v))
 391 #define lli_read(d, reg)                le32_to_cpu((d)->lli.reg)
 392 #define lli_write(d, reg, v)            ((d)->lli.reg = cpu_to_le32(v))
 393
 394         /* THEN values for driver housekeeping */
 395         struct list_head                desc_node;
 396         struct list_head                tx_list;
 397         struct dma_async_tx_descriptor  txd;
 398         size_t                          len;
 399         size_t                          total_len;
 400         u32                             residue;
 401 };
 402
 403 #define to_dw_desc(h)   list_entry(h, struct dw_desc, desc_node)
 404
 405 static inline struct dw_desc *
 406 txd_to_dw_desc(struct dma_async_tx_descriptor *txd)
 407 {
 408         return container_of(txd, struct dw_desc, txd);
 409 }