drivers/dma/txx9dmac.h

   1 /*
   2  * Driver for the TXx9 SoC DMA Controller
   3  *
   4  * Copyright (C) 2009 Atsushi Nemoto
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10 #ifndef TXX9DMAC_H
  11 #define TXX9DMAC_H
  12
  13 #include <linux/dmaengine.h>
  14 #include <asm/txx9/dmac.h>
  15
  16 /*
  17  * Design Notes:
  18  *
  19  * This DMAC have four channels and one FIFO buffer.  Each channel can
  20  * be configured for memory-memory or device-memory transfer, but only
  21  * one channel can do alignment-free memory-memory transfer at a time
  22  * while the channel should occupy the FIFO buffer for effective
  23  * transfers.
  24  *
  25  * Instead of dynamically assign the FIFO buffer to channels, I chose
  26  * make one dedicated channel for memory-memory transfer.  The
  27  * dedicated channel is public.  Other channels are private and used
  28  * for slave transfer.  Some devices in the SoC are wired to certain
  29  * DMA channel.
  30  */
  31
  32 #ifdef CONFIG_MACH_TX49XX
  33 static inline bool txx9_dma_have_SMPCHN(void)
  34 {
  35         return true;
  36 }
  37 #define TXX9_DMA_USE_SIMPLE_CHAIN
  38 #else
  39 static inline bool txx9_dma_have_SMPCHN(void)
  40 {
  41         return false;
  42 }
  43 #endif
  44
  45 #ifdef __LITTLE_ENDIAN
  46 #ifdef CONFIG_MACH_TX49XX
  47 #define CCR_LE  TXX9_DMA_CCR_LE
  48 #define MCR_LE  0
  49 #else
  50 #define CCR_LE  0
  51 #define MCR_LE  TXX9_DMA_MCR_LE
  52 #endif
  53 #else
  54 #define CCR_LE  0
  55 #define MCR_LE  0
  56 #endif
  57
  58 /*
  59  * Redefine this macro to handle differences between 32- and 64-bit
  60  * addressing, big vs. little endian, etc.
  61  */
  62 #ifdef __BIG_ENDIAN
  63 #define TXX9_DMA_REG32(name)            u32 __pad_##name; u32 name
  64 #else
  65 #define TXX9_DMA_REG32(name)            u32 name; u32 __pad_##name
  66 #endif
  67
  68 /* Hardware register definitions. */
  69 struct txx9dmac_cregs {
  70 #if defined(CONFIG_32BIT) && !defined(CONFIG_PHYS_ADDR_T_64BIT)
  71         TXX9_DMA_REG32(CHAR);   /* Chain Address Register */
  72 #else
  73         u64 CHAR;               /* Chain Address Register */
  74 #endif
  75         u64 SAR;                /* Source Address Register */
  76         u64 DAR;                /* Destination Address Register */
  77         TXX9_DMA_REG32(CNTR);   /* Count Register */
  78         TXX9_DMA_REG32(SAIR);   /* Source Address Increment Register */
  79         TXX9_DMA_REG32(DAIR);   /* Destination Address Increment Register */
  80         TXX9_DMA_REG32(CCR);    /* Channel Control Register */
  81         TXX9_DMA_REG32(CSR);    /* Channel Status Register */
  82 };
  83 struct txx9dmac_cregs32 {
  84         u32 CHAR;
  85         u32 SAR;
  86         u32 DAR;
  87         u32 CNTR;
  88         u32 SAIR;
  89         u32 DAIR;
  90         u32 CCR;
  91         u32 CSR;
  92 };
  93
  94 struct txx9dmac_regs {
  95         /* per-channel registers */
  96         struct txx9dmac_cregs   CHAN[TXX9_DMA_MAX_NR_CHANNELS];
  97         u64     __pad[9];
  98         u64     MFDR;           /* Memory Fill Data Register */
  99         TXX9_DMA_REG32(MCR);    /* Master Control Register */
 100 };
 101 struct txx9dmac_regs32 {
 102         struct txx9dmac_cregs32 CHAN[TXX9_DMA_MAX_NR_CHANNELS];
 103         u32     __pad[9];
 104         u32     MFDR;
 105         u32     MCR;
 106 };
 107
 108 /* bits for MCR */
 109 #define TXX9_DMA_MCR_EIS(ch)    (0x10000000<<(ch))
 110 #define TXX9_DMA_MCR_DIS(ch)    (0x01000000<<(ch))
 111 #define TXX9_DMA_MCR_RSFIF      0x00000080
 112 #define TXX9_DMA_MCR_FIFUM(ch)  (0x00000008<<(ch))
 113 #define TXX9_DMA_MCR_LE         0x00000004
 114 #define TXX9_DMA_MCR_RPRT       0x00000002
 115 #define TXX9_DMA_MCR_MSTEN      0x00000001
 116
 117 /* bits for CCRn */
 118 #define TXX9_DMA_CCR_IMMCHN     0x20000000
 119 #define TXX9_DMA_CCR_USEXFSZ    0x10000000
 120 #define TXX9_DMA_CCR_LE         0x08000000
 121 #define TXX9_DMA_CCR_DBINH      0x04000000
 122 #define TXX9_DMA_CCR_SBINH      0x02000000
 123 #define TXX9_DMA_CCR_CHRST      0x01000000
 124 #define TXX9_DMA_CCR_RVBYTE     0x00800000
 125 #define TXX9_DMA_CCR_ACKPOL     0x00400000
 126 #define TXX9_DMA_CCR_REQPL      0x00200000
 127 #define TXX9_DMA_CCR_EGREQ      0x00100000
 128 #define TXX9_DMA_CCR_CHDN       0x00080000
 129 #define TXX9_DMA_CCR_DNCTL      0x00060000
 130 #define TXX9_DMA_CCR_EXTRQ      0x00010000
 131 #define TXX9_DMA_CCR_INTRQD     0x0000e000
 132 #define TXX9_DMA_CCR_INTENE     0x00001000
 133 #define TXX9_DMA_CCR_INTENC     0x00000800
 134 #define TXX9_DMA_CCR_INTENT     0x00000400
 135 #define TXX9_DMA_CCR_CHNEN      0x00000200
 136 #define TXX9_DMA_CCR_XFACT      0x00000100
 137 #define TXX9_DMA_CCR_SMPCHN     0x00000020
 138 #define TXX9_DMA_CCR_XFSZ(order)        (((order) << 2) & 0x0000001c)
 139 #define TXX9_DMA_CCR_XFSZ_1     TXX9_DMA_CCR_XFSZ(0)
 140 #define TXX9_DMA_CCR_XFSZ_2     TXX9_DMA_CCR_XFSZ(1)
 141 #define TXX9_DMA_CCR_XFSZ_4     TXX9_DMA_CCR_XFSZ(2)
 142 #define TXX9_DMA_CCR_XFSZ_8     TXX9_DMA_CCR_XFSZ(3)
 143 #define TXX9_DMA_CCR_XFSZ_X4    TXX9_DMA_CCR_XFSZ(4)
 144 #define TXX9_DMA_CCR_XFSZ_X8    TXX9_DMA_CCR_XFSZ(5)
 145 #define TXX9_DMA_CCR_XFSZ_X16   TXX9_DMA_CCR_XFSZ(6)
 146 #define TXX9_DMA_CCR_XFSZ_X32   TXX9_DMA_CCR_XFSZ(7)
 147 #define TXX9_DMA_CCR_MEMIO      0x00000002
 148 #define TXX9_DMA_CCR_SNGAD      0x00000001
 149
 150 /* bits for CSRn */
 151 #define TXX9_DMA_CSR_CHNEN      0x00000400
 152 #define TXX9_DMA_CSR_STLXFER    0x00000200
 153 #define TXX9_DMA_CSR_XFACT      0x00000100
 154 #define TXX9_DMA_CSR_ABCHC      0x00000080
 155 #define TXX9_DMA_CSR_NCHNC      0x00000040
 156 #define TXX9_DMA_CSR_NTRNFC     0x00000020
 157 #define TXX9_DMA_CSR_EXTDN      0x00000010
 158 #define TXX9_DMA_CSR_CFERR      0x00000008
 159 #define TXX9_DMA_CSR_CHERR      0x00000004
 160 #define TXX9_DMA_CSR_DESERR     0x00000002
 161 #define TXX9_DMA_CSR_SORERR     0x00000001
 162
 163 struct txx9dmac_chan {
 164         struct dma_chan         chan;
 165         struct dma_device       dma;
 166         struct txx9dmac_dev     *ddev;
 167         void __iomem            *ch_regs;
 168         struct tasklet_struct   tasklet;
 169         int                     irq;
 170         u32                     ccr;
 171
 172         spinlock_t              lock;
 173
 174         /* these other elements are all protected by lock */
 175         struct list_head        active_list;
 176         struct list_head        queue;
 177         struct list_head        free_list;
 178
 179         unsigned int            descs_allocated;
 180 };
 181
 182 struct txx9dmac_dev {
 183         void __iomem            *regs;
 184         struct tasklet_struct   tasklet;
 185         int                     irq;
 186         struct txx9dmac_chan    *chan[TXX9_DMA_MAX_NR_CHANNELS];
 187         bool                    have_64bit_regs;
 188         unsigned int            descsize;
 189 };
 190
 191 static inline bool __is_dmac64(const struct txx9dmac_dev *ddev)
 192 {
 193         return ddev->have_64bit_regs;
 194 }
 195
 196 static inline bool is_dmac64(const struct txx9dmac_chan *dc)
 197 {
 198         return __is_dmac64(dc->ddev);
 199 }
 200
 201 #ifdef TXX9_DMA_USE_SIMPLE_CHAIN
 202 /* Hardware descriptor definition. (for simple-chain) */
 203 struct txx9dmac_hwdesc {
 204 #if defined(CONFIG_32BIT) && !defined(CONFIG_PHYS_ADDR_T_64BIT)
 205         TXX9_DMA_REG32(CHAR);
 206 #else
 207         u64 CHAR;
 208 #endif
 209         u64 SAR;
 210         u64 DAR;
 211         TXX9_DMA_REG32(CNTR);
 212 };
 213 struct txx9dmac_hwdesc32 {
 214         u32 CHAR;
 215         u32 SAR;
 216         u32 DAR;
 217         u32 CNTR;
 218 };
 219 #else
 220 #define txx9dmac_hwdesc txx9dmac_cregs
 221 #define txx9dmac_hwdesc32 txx9dmac_cregs32
 222 #endif
 223
 224 struct txx9dmac_desc {
 225         /* FIRST values the hardware uses */
 226         union {
 227                 struct txx9dmac_hwdesc hwdesc;
 228                 struct txx9dmac_hwdesc32 hwdesc32;
 229         };
 230
 231         /* THEN values for driver housekeeping */
 232         struct list_head                desc_node ____cacheline_aligned;
 233         struct list_head                tx_list;
 234         struct dma_async_tx_descriptor  txd;
 235         size_t                          len;
 236 };
 237
 238 #ifdef TXX9_DMA_USE_SIMPLE_CHAIN
 239
 240 static inline bool txx9dmac_chan_INTENT(struct txx9dmac_chan *dc)
 241 {
 242         return (dc->ccr & TXX9_DMA_CCR_INTENT) != 0;
 243 }
 244
 245 static inline void txx9dmac_chan_set_INTENT(struct txx9dmac_chan *dc)
 246 {
 247         dc->ccr |= TXX9_DMA_CCR_INTENT;
 248 }
 249
 250 static inline void txx9dmac_desc_set_INTENT(struct txx9dmac_dev *ddev,
 251                                             struct txx9dmac_desc *desc)
 252 {
 253 }
 254
 255 static inline void txx9dmac_chan_set_SMPCHN(struct txx9dmac_chan *dc)
 256 {
 257         dc->ccr |= TXX9_DMA_CCR_SMPCHN;
 258 }
 259
 260 static inline void txx9dmac_desc_set_nosimple(struct txx9dmac_dev *ddev,
 261                                               struct txx9dmac_desc *desc,
 262                                               u32 sair, u32 dair, u32 ccr)
 263 {
 264 }
 265
 266 #else /* TXX9_DMA_USE_SIMPLE_CHAIN */
 267
 268 static inline bool txx9dmac_chan_INTENT(struct txx9dmac_chan *dc)
 269 {
 270         return true;
 271 }
 272
 273 static void txx9dmac_chan_set_INTENT(struct txx9dmac_chan *dc)
 274 {
 275 }
 276
 277 static inline void txx9dmac_desc_set_INTENT(struct txx9dmac_dev *ddev,
 278                                             struct txx9dmac_desc *desc)
 279 {
 280         if (__is_dmac64(ddev))
 281                 desc->hwdesc.CCR |= TXX9_DMA_CCR_INTENT;
 282         else
 283                 desc->hwdesc32.CCR |= TXX9_DMA_CCR_INTENT;
 284 }
 285
 286 static inline void txx9dmac_chan_set_SMPCHN(struct txx9dmac_chan *dc)
 287 {
 288 }
 289
 290 static inline void txx9dmac_desc_set_nosimple(struct txx9dmac_dev *ddev,
 291                                               struct txx9dmac_desc *desc,
 292                                               u32 sai, u32 dai, u32 ccr)
 293 {
 294         if (__is_dmac64(ddev)) {
 295                 desc->hwdesc.SAIR = sai;
 296                 desc->hwdesc.DAIR = dai;
 297                 desc->hwdesc.CCR = ccr;
 298         } else {
 299                 desc->hwdesc32.SAIR = sai;
 300                 desc->hwdesc32.DAIR = dai;
 301                 desc->hwdesc32.CCR = ccr;
 302         }
 303 }
 304
 305 #endif /* TXX9_DMA_USE_SIMPLE_CHAIN */
 306
 307 #endif /* TXX9DMAC_H */