drivers/dma/stm32-mdma.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *
   4  * Copyright (C) STMicroelectronics SA 2017
   5  * Author(s): M'boumba Cedric Madianga <cedric.madianga@gmail.com>
   6  *            Pierre-Yves Mordret <pierre-yves.mordret@st.com>
   7  *
   8  * Driver for STM32 MDMA controller
   9  *
  10  * Inspired by stm32-dma.c and dma-jz4780.c
  11  */
  12
  13 #include <linux/bitfield.h>
  14 #include <linux/clk.h>
  15 #include <linux/delay.h>
  16 #include <linux/dmaengine.h>
  17 #include <linux/dma-mapping.h>
  18 #include <linux/dmapool.h>
  19 #include <linux/err.h>
  20 #include <linux/init.h>
  21 #include <linux/iopoll.h>
  22 #include <linux/jiffies.h>
  23 #include <linux/list.h>
  24 #include <linux/log2.h>
  25 #include <linux/module.h>
  26 #include <linux/of.h>
  27 #include <linux/of_device.h>
  28 #include <linux/of_dma.h>
  29 #include <linux/platform_device.h>
  30 #include <linux/pm_runtime.h>
  31 #include <linux/reset.h>
  32 #include <linux/slab.h>
  33
  34 #include "virt-dma.h"
  35
  36 #define STM32_MDMA_GISR0                0x0000 /* MDMA Int Status Reg 1 */
  37
  38 /* MDMA Channel x interrupt/status register */
  39 #define STM32_MDMA_CISR(x)              (0x40 + 0x40 * (x)) /* x = 0..62 */
  40 #define STM32_MDMA_CISR_CRQA            BIT(16)
  41 #define STM32_MDMA_CISR_TCIF            BIT(4)
  42 #define STM32_MDMA_CISR_BTIF            BIT(3)
  43 #define STM32_MDMA_CISR_BRTIF           BIT(2)
  44 #define STM32_MDMA_CISR_CTCIF           BIT(1)
  45 #define STM32_MDMA_CISR_TEIF            BIT(0)
  46
  47 /* MDMA Channel x interrupt flag clear register */
  48 #define STM32_MDMA_CIFCR(x)             (0x44 + 0x40 * (x))
  49 #define STM32_MDMA_CIFCR_CLTCIF         BIT(4)
  50 #define STM32_MDMA_CIFCR_CBTIF          BIT(3)
  51 #define STM32_MDMA_CIFCR_CBRTIF         BIT(2)
  52 #define STM32_MDMA_CIFCR_CCTCIF         BIT(1)
  53 #define STM32_MDMA_CIFCR_CTEIF          BIT(0)
  54 #define STM32_MDMA_CIFCR_CLEAR_ALL      (STM32_MDMA_CIFCR_CLTCIF \
  55                                         | STM32_MDMA_CIFCR_CBTIF \
  56                                         | STM32_MDMA_CIFCR_CBRTIF \
  57                                         | STM32_MDMA_CIFCR_CCTCIF \
  58                                         | STM32_MDMA_CIFCR_CTEIF)
  59
  60 /* MDMA Channel x error status register */
  61 #define STM32_MDMA_CESR(x)              (0x48 + 0x40 * (x))
  62 #define STM32_MDMA_CESR_BSE             BIT(11)
  63 #define STM32_MDMA_CESR_ASR             BIT(10)
  64 #define STM32_MDMA_CESR_TEMD            BIT(9)
  65 #define STM32_MDMA_CESR_TELD            BIT(8)
  66 #define STM32_MDMA_CESR_TED             BIT(7)
  67 #define STM32_MDMA_CESR_TEA_MASK        GENMASK(6, 0)
  68
  69 /* MDMA Channel x control register */
  70 #define STM32_MDMA_CCR(x)               (0x4C + 0x40 * (x))
  71 #define STM32_MDMA_CCR_SWRQ             BIT(16)
  72 #define STM32_MDMA_CCR_WEX              BIT(14)
  73 #define STM32_MDMA_CCR_HEX              BIT(13)
  74 #define STM32_MDMA_CCR_BEX              BIT(12)
  75 #define STM32_MDMA_CCR_SM               BIT(8)
  76 #define STM32_MDMA_CCR_PL_MASK          GENMASK(7, 6)
  77 #define STM32_MDMA_CCR_PL(n)            FIELD_PREP(STM32_MDMA_CCR_PL_MASK, (n))
  78 #define STM32_MDMA_CCR_TCIE             BIT(5)
  79 #define STM32_MDMA_CCR_BTIE             BIT(4)
  80 #define STM32_MDMA_CCR_BRTIE            BIT(3)
  81 #define STM32_MDMA_CCR_CTCIE            BIT(2)
  82 #define STM32_MDMA_CCR_TEIE             BIT(1)
  83 #define STM32_MDMA_CCR_EN               BIT(0)
  84 #define STM32_MDMA_CCR_IRQ_MASK         (STM32_MDMA_CCR_TCIE \
  85                                         | STM32_MDMA_CCR_BTIE \
  86                                         | STM32_MDMA_CCR_BRTIE \
  87                                         | STM32_MDMA_CCR_CTCIE \
  88                                         | STM32_MDMA_CCR_TEIE)
  89
  90 /* MDMA Channel x transfer configuration register */
  91 #define STM32_MDMA_CTCR(x)              (0x50 + 0x40 * (x))
  92 #define STM32_MDMA_CTCR_BWM             BIT(31)
  93 #define STM32_MDMA_CTCR_SWRM            BIT(30)
  94 #define STM32_MDMA_CTCR_TRGM_MSK        GENMASK(29, 28)
  95 #define STM32_MDMA_CTCR_TRGM(n)         FIELD_PREP(STM32_MDMA_CTCR_TRGM_MSK, (n))
  96 #define STM32_MDMA_CTCR_TRGM_GET(n)     FIELD_GET(STM32_MDMA_CTCR_TRGM_MSK, (n))
  97 #define STM32_MDMA_CTCR_PAM_MASK        GENMASK(27, 26)
  98 #define STM32_MDMA_CTCR_PAM(n)          FIELD_PREP(STM32_MDMA_CTCR_PAM_MASK, (n))
  99 #define STM32_MDMA_CTCR_PKE             BIT(25)
 100 #define STM32_MDMA_CTCR_TLEN_MSK        GENMASK(24, 18)
 101 #define STM32_MDMA_CTCR_TLEN(n)         FIELD_PREP(STM32_MDMA_CTCR_TLEN_MSK, (n))
 102 #define STM32_MDMA_CTCR_TLEN_GET(n)     FIELD_GET(STM32_MDMA_CTCR_TLEN_MSK, (n))
 103 #define STM32_MDMA_CTCR_LEN2_MSK        GENMASK(25, 18)
 104 #define STM32_MDMA_CTCR_LEN2(n)         FIELD_PREP(STM32_MDMA_CTCR_LEN2_MSK, (n))
 105 #define STM32_MDMA_CTCR_LEN2_GET(n)     FIELD_GET(STM32_MDMA_CTCR_LEN2_MSK, (n))
 106 #define STM32_MDMA_CTCR_DBURST_MASK     GENMASK(17, 15)
 107 #define STM32_MDMA_CTCR_DBURST(n)       FIELD_PREP(STM32_MDMA_CTCR_DBURST_MASK, (n))
 108 #define STM32_MDMA_CTCR_SBURST_MASK     GENMASK(14, 12)
 109 #define STM32_MDMA_CTCR_SBURST(n)       FIELD_PREP(STM32_MDMA_CTCR_SBURST_MASK, (n))
 110 #define STM32_MDMA_CTCR_DINCOS_MASK     GENMASK(11, 10)
 111 #define STM32_MDMA_CTCR_DINCOS(n)       FIELD_PREP(STM32_MDMA_CTCR_DINCOS_MASK, (n))
 112 #define STM32_MDMA_CTCR_SINCOS_MASK     GENMASK(9, 8)
 113 #define STM32_MDMA_CTCR_SINCOS(n)       FIELD_PREP(STM32_MDMA_CTCR_SINCOS_MASK, (n))
 114 #define STM32_MDMA_CTCR_DSIZE_MASK      GENMASK(7, 6)
 115 #define STM32_MDMA_CTCR_DSIZE(n)        FIELD_PREP(STM32_MDMA_CTCR_DSIZE_MASK, (n))
 116 #define STM32_MDMA_CTCR_SSIZE_MASK      GENMASK(5, 4)
 117 #define STM32_MDMA_CTCR_SSIZE(n)        FIELD_PREP(STM32_MDMA_CTCR_SSIZE_MASK, (n))
 118 #define STM32_MDMA_CTCR_DINC_MASK       GENMASK(3, 2)
 119 #define STM32_MDMA_CTCR_DINC(n)         FIELD_PREP(STM32_MDMA_CTCR_DINC_MASK, (n))
 120 #define STM32_MDMA_CTCR_SINC_MASK       GENMASK(1, 0)
 121 #define STM32_MDMA_CTCR_SINC(n)         FIELD_PREP(STM32_MDMA_CTCR_SINC_MASK, (n))
 122 #define STM32_MDMA_CTCR_CFG_MASK        (STM32_MDMA_CTCR_SINC_MASK \
 123                                         | STM32_MDMA_CTCR_DINC_MASK \
 124                                         | STM32_MDMA_CTCR_SINCOS_MASK \
 125                                         | STM32_MDMA_CTCR_DINCOS_MASK \
 126                                         | STM32_MDMA_CTCR_LEN2_MSK \
 127                                         | STM32_MDMA_CTCR_TRGM_MSK)
 128
 129 /* MDMA Channel x block number of data register */
 130 #define STM32_MDMA_CBNDTR(x)            (0x54 + 0x40 * (x))
 131 #define STM32_MDMA_CBNDTR_BRC_MK        GENMASK(31, 20)
 132 #define STM32_MDMA_CBNDTR_BRC(n)        FIELD_PREP(STM32_MDMA_CBNDTR_BRC_MK, (n))
 133 #define STM32_MDMA_CBNDTR_BRC_GET(n)    FIELD_GET(STM32_MDMA_CBNDTR_BRC_MK, (n))
 134
 135 #define STM32_MDMA_CBNDTR_BRDUM         BIT(19)
 136 #define STM32_MDMA_CBNDTR_BRSUM         BIT(18)
 137 #define STM32_MDMA_CBNDTR_BNDT_MASK     GENMASK(16, 0)
 138 #define STM32_MDMA_CBNDTR_BNDT(n)       FIELD_PREP(STM32_MDMA_CBNDTR_BNDT_MASK, (n))
 139
 140 /* MDMA Channel x source address register */
 141 #define STM32_MDMA_CSAR(x)              (0x58 + 0x40 * (x))
 142
 143 /* MDMA Channel x destination address register */
 144 #define STM32_MDMA_CDAR(x)              (0x5C + 0x40 * (x))
 145
 146 /* MDMA Channel x block repeat address update register */
 147 #define STM32_MDMA_CBRUR(x)             (0x60 + 0x40 * (x))
 148 #define STM32_MDMA_CBRUR_DUV_MASK       GENMASK(31, 16)
 149 #define STM32_MDMA_CBRUR_DUV(n)         FIELD_PREP(STM32_MDMA_CBRUR_DUV_MASK, (n))
 150 #define STM32_MDMA_CBRUR_SUV_MASK       GENMASK(15, 0)
 151 #define STM32_MDMA_CBRUR_SUV(n)         FIELD_PREP(STM32_MDMA_CBRUR_SUV_MASK, (n))
 152
 153 /* MDMA Channel x link address register */
 154 #define STM32_MDMA_CLAR(x)              (0x64 + 0x40 * (x))
 155
 156 /* MDMA Channel x trigger and bus selection register */
 157 #define STM32_MDMA_CTBR(x)              (0x68 + 0x40 * (x))
 158 #define STM32_MDMA_CTBR_DBUS            BIT(17)
 159 #define STM32_MDMA_CTBR_SBUS            BIT(16)
 160 #define STM32_MDMA_CTBR_TSEL_MASK       GENMASK(5, 0)
 161 #define STM32_MDMA_CTBR_TSEL(n)         FIELD_PREP(STM32_MDMA_CTBR_TSEL_MASK, (n))
 162
 163 /* MDMA Channel x mask address register */
 164 #define STM32_MDMA_CMAR(x)              (0x70 + 0x40 * (x))
 165
 166 /* MDMA Channel x mask data register */
 167 #define STM32_MDMA_CMDR(x)              (0x74 + 0x40 * (x))
 168
 169 #define STM32_MDMA_MAX_BUF_LEN          128
 170 #define STM32_MDMA_MAX_BLOCK_LEN        65536
 171 #define STM32_MDMA_MAX_CHANNELS         32
 172 #define STM32_MDMA_MAX_REQUESTS         256
 173 #define STM32_MDMA_MAX_BURST            128
 174 #define STM32_MDMA_VERY_HIGH_PRIORITY   0x3
 175
 176 enum stm32_mdma_trigger_mode {
 177         STM32_MDMA_BUFFER,
 178         STM32_MDMA_BLOCK,
 179         STM32_MDMA_BLOCK_REP,
 180         STM32_MDMA_LINKED_LIST,
 181 };
 182
 183 enum stm32_mdma_width {
 184         STM32_MDMA_BYTE,
 185         STM32_MDMA_HALF_WORD,
 186         STM32_MDMA_WORD,
 187         STM32_MDMA_DOUBLE_WORD,
 188 };
 189
 190 enum stm32_mdma_inc_mode {
 191         STM32_MDMA_FIXED = 0,
 192         STM32_MDMA_INC = 2,
 193         STM32_MDMA_DEC = 3,
 194 };
 195
 196 struct stm32_mdma_chan_config {
 197         u32 request;
 198         u32 priority_level;
 199         u32 transfer_config;
 200         u32 mask_addr;
 201         u32 mask_data;
 202         bool m2m_hw; /* True when MDMA is triggered by STM32 DMA */
 203 };
 204
 205 struct stm32_mdma_hwdesc {
 206         u32 ctcr;
 207         u32 cbndtr;
 208         u32 csar;
 209         u32 cdar;
 210         u32 cbrur;
 211         u32 clar;
 212         u32 ctbr;
 213         u32 dummy;
 214         u32 cmar;
 215         u32 cmdr;
 216 } __aligned(64);
 217
 218 struct stm32_mdma_desc_node {
 219         struct stm32_mdma_hwdesc *hwdesc;
 220         dma_addr_t hwdesc_phys;
 221 };
 222
 223 struct stm32_mdma_desc {
 224         struct virt_dma_desc vdesc;
 225         u32 ccr;
 226         bool cyclic;
 227         u32 count;
 228         struct stm32_mdma_desc_node node[];
 229 };
 230
 231 struct stm32_mdma_dma_config {
 232         u32 request;    /* STM32 DMA channel stream id, triggering MDMA */
 233         u32 cmar;       /* STM32 DMA interrupt flag clear register address */
 234         u32 cmdr;       /* STM32 DMA Transfer Complete flag */
 235 };
 236
 237 struct stm32_mdma_chan {
 238         struct virt_dma_chan vchan;
 239         struct dma_pool *desc_pool;
 240         u32 id;
 241         struct stm32_mdma_desc *desc;
 242         u32 curr_hwdesc;
 243         struct dma_slave_config dma_config;
 244         struct stm32_mdma_chan_config chan_config;
 245         bool busy;
 246         u32 mem_burst;
 247         u32 mem_width;
 248 };
 249
 250 struct stm32_mdma_device {
 251         struct dma_device ddev;
 252         void __iomem *base;
 253         struct clk *clk;
 254         int irq;
 255         u32 nr_channels;
 256         u32 nr_requests;
 257         u32 nr_ahb_addr_masks;
 258         u32 chan_reserved;
 259         struct stm32_mdma_chan chan[STM32_MDMA_MAX_CHANNELS];
 260         u32 ahb_addr_masks[];
 261 };
 262
 263 static struct stm32_mdma_device *stm32_mdma_get_dev(
 264         struct stm32_mdma_chan *chan)
 265 {
 266         return container_of(chan->vchan.chan.device, struct stm32_mdma_device,
 267                             ddev);
 268 }
 269
 270 static struct stm32_mdma_chan *to_stm32_mdma_chan(struct dma_chan *c)
 271 {
 272         return container_of(c, struct stm32_mdma_chan, vchan.chan);
 273 }
 274
 275 static struct stm32_mdma_desc *to_stm32_mdma_desc(struct virt_dma_desc *vdesc)
 276 {
 277         return container_of(vdesc, struct stm32_mdma_desc, vdesc);
 278 }
 279
 280 static struct device *chan2dev(struct stm32_mdma_chan *chan)
 281 {
 282         return &chan->vchan.chan.dev->device;
 283 }
 284
 285 static struct device *mdma2dev(struct stm32_mdma_device *mdma_dev)
 286 {
 287         return mdma_dev->ddev.dev;
 288 }
 289
 290 static u32 stm32_mdma_read(struct stm32_mdma_device *dmadev, u32 reg)
 291 {
 292         return readl_relaxed(dmadev->base + reg);
 293 }
 294
 295 static void stm32_mdma_write(struct stm32_mdma_device *dmadev, u32 reg, u32 val)
 296 {
 297         writel_relaxed(val, dmadev->base + reg);
 298 }
 299
 300 static void stm32_mdma_set_bits(struct stm32_mdma_device *dmadev, u32 reg,
 301                                 u32 mask)
 302 {
 303         void __iomem *addr = dmadev->base + reg;
 304
 305         writel_relaxed(readl_relaxed(addr) | mask, addr);
 306 }
 307
 308 static void stm32_mdma_clr_bits(struct stm32_mdma_device *dmadev, u32 reg,
 309                                 u32 mask)
 310 {
 311         void __iomem *addr = dmadev->base + reg;
 312
 313         writel_relaxed(readl_relaxed(addr) & ~mask, addr);
 314 }
 315
 316 static struct stm32_mdma_desc *stm32_mdma_alloc_desc(
 317                 struct stm32_mdma_chan *chan, u32 count)
 318 {
 319         struct stm32_mdma_desc *desc;
 320         int i;
 321
 322         desc = kzalloc(struct_size(desc, node, count), GFP_NOWAIT);
 323         if (!desc)
 324                 return NULL;
 325
 326         for (i = 0; i < count; i++) {
 327                 desc->node[i].hwdesc =
 328                         dma_pool_alloc(chan->desc_pool, GFP_NOWAIT,
 329                                        &desc->node[i].hwdesc_phys);
 330                 if (!desc->node[i].hwdesc)
 331                         goto err;
 332         }
 333
 334         desc->count = count;
 335
 336         return desc;
 337
 338 err:
 339         dev_err(chan2dev(chan), "Failed to allocate descriptor\n");
 340         while (--i >= 0)
 341                 dma_pool_free(chan->desc_pool, desc->node[i].hwdesc,
 342                               desc->node[i].hwdesc_phys);
 343         kfree(desc);
 344         return NULL;
 345 }
 346
 347 static void stm32_mdma_desc_free(struct virt_dma_desc *vdesc)
 348 {
 349         struct stm32_mdma_desc *desc = to_stm32_mdma_desc(vdesc);
 350         struct stm32_mdma_chan *chan = to_stm32_mdma_chan(vdesc->tx.chan);
 351         int i;
 352
 353         for (i = 0; i < desc->count; i++)
 354                 dma_pool_free(chan->desc_pool, desc->node[i].hwdesc,
 355                               desc->node[i].hwdesc_phys);
 356         kfree(desc);
 357 }
 358
 359 static int stm32_mdma_get_width(struct stm32_mdma_chan *chan,
 360                                 enum dma_slave_buswidth width)
 361 {
 362         switch (width) {
 363         case DMA_SLAVE_BUSWIDTH_1_BYTE:
 364         case DMA_SLAVE_BUSWIDTH_2_BYTES:
 365         case DMA_SLAVE_BUSWIDTH_4_BYTES:
 366         case DMA_SLAVE_BUSWIDTH_8_BYTES:
 367                 return ffs(width) - 1;
 368         default:
 369                 dev_err(chan2dev(chan), "Dma bus width %i not supported\n",
 370                         width);
 371                 return -EINVAL;
 372         }
 373 }
 374
 375 static enum dma_slave_buswidth stm32_mdma_get_max_width(dma_addr_t addr,
 376                                                         u32 buf_len, u32 tlen)
 377 {
 378         enum dma_slave_buswidth max_width = DMA_SLAVE_BUSWIDTH_8_BYTES;
 379
 380         for (max_width = DMA_SLAVE_BUSWIDTH_8_BYTES;
 381              max_width > DMA_SLAVE_BUSWIDTH_1_BYTE;
 382              max_width >>= 1) {
 383                 /*
 384                  * Address and buffer length both have to be aligned on
 385                  * bus width
 386                  */
 387                 if ((((buf_len | addr) & (max_width - 1)) == 0) &&
 388                     tlen >= max_width)
 389                         break;
 390         }
 391
 392         return max_width;
 393 }
 394
 395 static u32 stm32_mdma_get_best_burst(u32 buf_len, u32 tlen, u32 max_burst,
 396                                      enum dma_slave_buswidth width)
 397 {
 398         u32 best_burst;
 399
 400         best_burst = min((u32)1 << __ffs(tlen | buf_len),
 401                          max_burst * width) / width;
 402
 403         return (best_burst > 0) ? best_burst : 1;
 404 }
 405
 406 static int stm32_mdma_disable_chan(struct stm32_mdma_chan *chan)
 407 {
 408         struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
 409         u32 ccr, cisr, id, reg;
 410         int ret;
 411
 412         id = chan->id;
 413         reg = STM32_MDMA_CCR(id);
 414
 415         /* Disable interrupts */
 416         stm32_mdma_clr_bits(dmadev, reg, STM32_MDMA_CCR_IRQ_MASK);
 417
 418         ccr = stm32_mdma_read(dmadev, reg);
 419         if (ccr & STM32_MDMA_CCR_EN) {
 420                 stm32_mdma_clr_bits(dmadev, reg, STM32_MDMA_CCR_EN);
 421
 422                 /* Ensure that any ongoing transfer has been completed */
 423                 ret = readl_relaxed_poll_timeout_atomic(
 424                                 dmadev->base + STM32_MDMA_CISR(id), cisr,
 425                                 (cisr & STM32_MDMA_CISR_CTCIF), 10, 1000);
 426                 if (ret) {
 427                         dev_err(chan2dev(chan), "%s: timeout!\n", __func__);
 428                         return -EBUSY;
 429                 }
 430         }
 431
 432         return 0;
 433 }
 434
 435 static void stm32_mdma_stop(struct stm32_mdma_chan *chan)
 436 {
 437         struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
 438         u32 status;
 439         int ret;
 440
 441         /* Disable DMA */
 442         ret = stm32_mdma_disable_chan(chan);
 443         if (ret < 0)
 444                 return;
 445
 446         /* Clear interrupt status if it is there */
 447         status = stm32_mdma_read(dmadev, STM32_MDMA_CISR(chan->id));
 448         if (status) {
 449                 dev_dbg(chan2dev(chan), "%s(): clearing interrupt: 0x%08x\n",
 450                         __func__, status);
 451                 stm32_mdma_set_bits(dmadev, STM32_MDMA_CIFCR(chan->id), status);
 452         }
 453
 454         chan->busy = false;
 455 }
 456
 457 static void stm32_mdma_set_bus(struct stm32_mdma_device *dmadev, u32 *ctbr,
 458                                u32 ctbr_mask, u32 src_addr)
 459 {
 460         u32 mask;
 461         int i;
 462
 463         /* Check if memory device is on AHB or AXI */
 464         *ctbr &= ~ctbr_mask;
 465         mask = src_addr & 0xF0000000;
 466         for (i = 0; i < dmadev->nr_ahb_addr_masks; i++) {
 467                 if (mask == dmadev->ahb_addr_masks[i]) {
 468                         *ctbr |= ctbr_mask;
 469                         break;
 470                 }
 471         }
 472 }
 473
 474 static int stm32_mdma_set_xfer_param(struct stm32_mdma_chan *chan,
 475                                      enum dma_transfer_direction direction,
 476                                      u32 *mdma_ccr, u32 *mdma_ctcr,
 477                                      u32 *mdma_ctbr, dma_addr_t addr,
 478                                      u32 buf_len)
 479 {
 480         struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
 481         struct stm32_mdma_chan_config *chan_config = &chan->chan_config;
 482         enum dma_slave_buswidth src_addr_width, dst_addr_width;
 483         phys_addr_t src_addr, dst_addr;
 484         int src_bus_width, dst_bus_width;
 485         u32 src_maxburst, dst_maxburst, src_best_burst, dst_best_burst;
 486         u32 ccr, ctcr, ctbr, tlen;
 487
 488         src_addr_width = chan->dma_config.src_addr_width;
 489         dst_addr_width = chan->dma_config.dst_addr_width;
 490         src_maxburst = chan->dma_config.src_maxburst;
 491         dst_maxburst = chan->dma_config.dst_maxburst;
 492
 493         ccr = stm32_mdma_read(dmadev, STM32_MDMA_CCR(chan->id));
 494         ctcr = stm32_mdma_read(dmadev, STM32_MDMA_CTCR(chan->id));
 495         ctbr = stm32_mdma_read(dmadev, STM32_MDMA_CTBR(chan->id));
 496
 497         /* Enable HW request mode */
 498         ctcr &= ~STM32_MDMA_CTCR_SWRM;
 499
 500         /* Set DINC, SINC, DINCOS, SINCOS, TRGM and TLEN retrieve from DT */
 501         ctcr &= ~STM32_MDMA_CTCR_CFG_MASK;
 502         ctcr |= chan_config->transfer_config & STM32_MDMA_CTCR_CFG_MASK;
 503
 504         /*
 505          * For buffer transfer length (TLEN) we have to set
 506          * the number of bytes - 1 in CTCR register
 507          */
 508         tlen = STM32_MDMA_CTCR_LEN2_GET(ctcr);
 509         ctcr &= ~STM32_MDMA_CTCR_LEN2_MSK;
 510         ctcr |= STM32_MDMA_CTCR_TLEN((tlen - 1));
 511
 512         /* Disable Pack Enable */
 513         ctcr &= ~STM32_MDMA_CTCR_PKE;
 514
 515         /* Check burst size constraints */
 516         if (src_maxburst * src_addr_width > STM32_MDMA_MAX_BURST ||
 517             dst_maxburst * dst_addr_width > STM32_MDMA_MAX_BURST) {
 518                 dev_err(chan2dev(chan),
 519                         "burst size * bus width higher than %d bytes\n",
 520                         STM32_MDMA_MAX_BURST);
 521                 return -EINVAL;
 522         }
 523
 524         if ((!is_power_of_2(src_maxburst) && src_maxburst > 0) ||
 525             (!is_power_of_2(dst_maxburst) && dst_maxburst > 0)) {
 526                 dev_err(chan2dev(chan), "burst size must be a power of 2\n");
 527                 return -EINVAL;
 528         }
 529
 530         /*
 531          * Configure channel control:
 532          * - Clear SW request as in this case this is a HW one
 533          * - Clear WEX, HEX and BEX bits
 534          * - Set priority level
 535          */
 536         ccr &= ~(STM32_MDMA_CCR_SWRQ | STM32_MDMA_CCR_WEX | STM32_MDMA_CCR_HEX |
 537                  STM32_MDMA_CCR_BEX | STM32_MDMA_CCR_PL_MASK);
 538         ccr |= STM32_MDMA_CCR_PL(chan_config->priority_level);
 539
 540         /* Configure Trigger selection */
 541         ctbr &= ~STM32_MDMA_CTBR_TSEL_MASK;
 542         ctbr |= STM32_MDMA_CTBR_TSEL(chan_config->request);
 543
 544         switch (direction) {
 545         case DMA_MEM_TO_DEV:
 546                 dst_addr = chan->dma_config.dst_addr;
 547
 548                 /* Set device data size */
 549                 if (chan_config->m2m_hw)
 550                         dst_addr_width = stm32_mdma_get_max_width(dst_addr, buf_len,
 551                                                                   STM32_MDMA_MAX_BUF_LEN);
 552                 dst_bus_width = stm32_mdma_get_width(chan, dst_addr_width);
 553                 if (dst_bus_width < 0)
 554                         return dst_bus_width;
 555                 ctcr &= ~STM32_MDMA_CTCR_DSIZE_MASK;
 556                 ctcr |= STM32_MDMA_CTCR_DSIZE(dst_bus_width);
 557                 if (chan_config->m2m_hw) {
 558                         ctcr &= ~STM32_MDMA_CTCR_DINCOS_MASK;
 559                         ctcr |= STM32_MDMA_CTCR_DINCOS(dst_bus_width);
 560                 }
 561
 562                 /* Set device burst value */
 563                 if (chan_config->m2m_hw)
 564                         dst_maxburst = STM32_MDMA_MAX_BUF_LEN / dst_addr_width;
 565
 566                 dst_best_burst = stm32_mdma_get_best_burst(buf_len, tlen,
 567                                                            dst_maxburst,
 568                                                            dst_addr_width);
 569                 chan->mem_burst = dst_best_burst;
 570                 ctcr &= ~STM32_MDMA_CTCR_DBURST_MASK;
 571                 ctcr |= STM32_MDMA_CTCR_DBURST((ilog2(dst_best_burst)));
 572
 573                 /* Set memory data size */
 574                 src_addr_width = stm32_mdma_get_max_width(addr, buf_len, tlen);
 575                 chan->mem_width = src_addr_width;
 576                 src_bus_width = stm32_mdma_get_width(chan, src_addr_width);
 577                 if (src_bus_width < 0)
 578                         return src_bus_width;
 579                 ctcr &= ~STM32_MDMA_CTCR_SSIZE_MASK |
 580                         STM32_MDMA_CTCR_SINCOS_MASK;
 581                 ctcr |= STM32_MDMA_CTCR_SSIZE(src_bus_width) |
 582                         STM32_MDMA_CTCR_SINCOS(src_bus_width);
 583
 584                 /* Set memory burst value */
 585                 src_maxburst = STM32_MDMA_MAX_BUF_LEN / src_addr_width;
 586                 src_best_burst = stm32_mdma_get_best_burst(buf_len, tlen,
 587                                                            src_maxburst,
 588                                                            src_addr_width);
 589                 chan->mem_burst = src_best_burst;
 590                 ctcr &= ~STM32_MDMA_CTCR_SBURST_MASK;
 591                 ctcr |= STM32_MDMA_CTCR_SBURST((ilog2(src_best_burst)));
 592
 593                 /* Select bus */
 594                 stm32_mdma_set_bus(dmadev, &ctbr, STM32_MDMA_CTBR_DBUS,
 595                                    dst_addr);
 596
 597                 if (dst_bus_width != src_bus_width)
 598                         ctcr |= STM32_MDMA_CTCR_PKE;
 599
 600                 /* Set destination address */
 601                 stm32_mdma_write(dmadev, STM32_MDMA_CDAR(chan->id), dst_addr);
 602                 break;
 603
 604         case DMA_DEV_TO_MEM:
 605                 src_addr = chan->dma_config.src_addr;
 606
 607                 /* Set device data size */
 608                 if (chan_config->m2m_hw)
 609                         src_addr_width = stm32_mdma_get_max_width(src_addr, buf_len,
 610                                                                   STM32_MDMA_MAX_BUF_LEN);
 611
 612                 src_bus_width = stm32_mdma_get_width(chan, src_addr_width);
 613                 if (src_bus_width < 0)
 614                         return src_bus_width;
 615                 ctcr &= ~STM32_MDMA_CTCR_SSIZE_MASK;
 616                 ctcr |= STM32_MDMA_CTCR_SSIZE(src_bus_width);
 617                 if (chan_config->m2m_hw) {
 618                         ctcr &= ~STM32_MDMA_CTCR_SINCOS_MASK;
 619                         ctcr |= STM32_MDMA_CTCR_SINCOS(src_bus_width);
 620                 }
 621
 622                 /* Set device burst value */
 623                 if (chan_config->m2m_hw)
 624                         src_maxburst = STM32_MDMA_MAX_BUF_LEN / src_addr_width;
 625
 626                 src_best_burst = stm32_mdma_get_best_burst(buf_len, tlen,
 627                                                            src_maxburst,
 628                                                            src_addr_width);
 629                 ctcr &= ~STM32_MDMA_CTCR_SBURST_MASK;
 630                 ctcr |= STM32_MDMA_CTCR_SBURST((ilog2(src_best_burst)));
 631
 632                 /* Set memory data size */
 633                 dst_addr_width = stm32_mdma_get_max_width(addr, buf_len, tlen);
 634                 chan->mem_width = dst_addr_width;
 635                 dst_bus_width = stm32_mdma_get_width(chan, dst_addr_width);
 636                 if (dst_bus_width < 0)
 637                         return dst_bus_width;
 638                 ctcr &= ~(STM32_MDMA_CTCR_DSIZE_MASK |
 639                         STM32_MDMA_CTCR_DINCOS_MASK);
 640                 ctcr |= STM32_MDMA_CTCR_DSIZE(dst_bus_width) |
 641                         STM32_MDMA_CTCR_DINCOS(dst_bus_width);
 642
 643                 /* Set memory burst value */
 644                 dst_maxburst = STM32_MDMA_MAX_BUF_LEN / dst_addr_width;
 645                 dst_best_burst = stm32_mdma_get_best_burst(buf_len, tlen,
 646                                                            dst_maxburst,
 647                                                            dst_addr_width);
 648                 ctcr &= ~STM32_MDMA_CTCR_DBURST_MASK;
 649                 ctcr |= STM32_MDMA_CTCR_DBURST((ilog2(dst_best_burst)));
 650
 651                 /* Select bus */
 652                 stm32_mdma_set_bus(dmadev, &ctbr, STM32_MDMA_CTBR_SBUS,
 653                                    src_addr);
 654
 655                 if (dst_bus_width != src_bus_width)
 656                         ctcr |= STM32_MDMA_CTCR_PKE;
 657
 658                 /* Set source address */
 659                 stm32_mdma_write(dmadev, STM32_MDMA_CSAR(chan->id), src_addr);
 660                 break;
 661
 662         default:
 663                 dev_err(chan2dev(chan), "Dma direction is not supported\n");
 664                 return -EINVAL;
 665         }
 666
 667         *mdma_ccr = ccr;
 668         *mdma_ctcr = ctcr;
 669         *mdma_ctbr = ctbr;
 670
 671         return 0;
 672 }
 673
 674 static void stm32_mdma_dump_hwdesc(struct stm32_mdma_chan *chan,
 675                                    struct stm32_mdma_desc_node *node)
 676 {
 677         dev_dbg(chan2dev(chan), "hwdesc:  %pad\n", &node->hwdesc_phys);
 678         dev_dbg(chan2dev(chan), "CTCR:    0x%08x\n", node->hwdesc->ctcr);
 679         dev_dbg(chan2dev(chan), "CBNDTR:  0x%08x\n", node->hwdesc->cbndtr);
 680         dev_dbg(chan2dev(chan), "CSAR:    0x%08x\n", node->hwdesc->csar);
 681         dev_dbg(chan2dev(chan), "CDAR:    0x%08x\n", node->hwdesc->cdar);
 682         dev_dbg(chan2dev(chan), "CBRUR:   0x%08x\n", node->hwdesc->cbrur);
 683         dev_dbg(chan2dev(chan), "CLAR:    0x%08x\n", node->hwdesc->clar);
 684         dev_dbg(chan2dev(chan), "CTBR:    0x%08x\n", node->hwdesc->ctbr);
 685         dev_dbg(chan2dev(chan), "CMAR:    0x%08x\n", node->hwdesc->cmar);
 686         dev_dbg(chan2dev(chan), "CMDR:    0x%08x\n\n", node->hwdesc->cmdr);
 687 }
 688
 689 static void stm32_mdma_setup_hwdesc(struct stm32_mdma_chan *chan,
 690                                     struct stm32_mdma_desc *desc,
 691                                     enum dma_transfer_direction dir, u32 count,
 692                                     dma_addr_t src_addr, dma_addr_t dst_addr,
 693                                     u32 len, u32 ctcr, u32 ctbr, bool is_last,
 694                                     bool is_first, bool is_cyclic)
 695 {
 696         struct stm32_mdma_chan_config *config = &chan->chan_config;
 697         struct stm32_mdma_hwdesc *hwdesc;
 698         u32 next = count + 1;
 699
 700         hwdesc = desc->node[count].hwdesc;
 701         hwdesc->ctcr = ctcr;
 702         hwdesc->cbndtr &= ~(STM32_MDMA_CBNDTR_BRC_MK |
 703                         STM32_MDMA_CBNDTR_BRDUM |
 704                         STM32_MDMA_CBNDTR_BRSUM |
 705                         STM32_MDMA_CBNDTR_BNDT_MASK);
 706         hwdesc->cbndtr |= STM32_MDMA_CBNDTR_BNDT(len);
 707         hwdesc->csar = src_addr;
 708         hwdesc->cdar = dst_addr;
 709         hwdesc->cbrur = 0;
 710         hwdesc->ctbr = ctbr;
 711         hwdesc->cmar = config->mask_addr;
 712         hwdesc->cmdr = config->mask_data;
 713
 714         if (is_last) {
 715                 if (is_cyclic)
 716                         hwdesc->clar = desc->node[0].hwdesc_phys;
 717                 else
 718                         hwdesc->clar = 0;
 719         } else {
 720                 hwdesc->clar = desc->node[next].hwdesc_phys;
 721         }
 722
 723         stm32_mdma_dump_hwdesc(chan, &desc->node[count]);
 724 }
 725
 726 static int stm32_mdma_setup_xfer(struct stm32_mdma_chan *chan,
 727                                  struct stm32_mdma_desc *desc,
 728                                  struct scatterlist *sgl, u32 sg_len,
 729                                  enum dma_transfer_direction direction)
 730 {
 731         struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
 732         struct dma_slave_config *dma_config = &chan->dma_config;
 733         struct stm32_mdma_chan_config *chan_config = &chan->chan_config;
 734         struct scatterlist *sg;
 735         dma_addr_t src_addr, dst_addr;
 736         u32 m2m_hw_period, ccr, ctcr, ctbr;
 737         int i, ret = 0;
 738
 739         if (chan_config->m2m_hw)
 740                 m2m_hw_period = sg_dma_len(sgl);
 741
 742         for_each_sg(sgl, sg, sg_len, i) {
 743                 if (sg_dma_len(sg) > STM32_MDMA_MAX_BLOCK_LEN) {
 744                         dev_err(chan2dev(chan), "Invalid block len\n");
 745                         return -EINVAL;
 746                 }
 747
 748                 if (direction == DMA_MEM_TO_DEV) {
 749                         src_addr = sg_dma_address(sg);
 750                         dst_addr = dma_config->dst_addr;
 751                         if (chan_config->m2m_hw && (i & 1))
 752                                 dst_addr += m2m_hw_period;
 753                         ret = stm32_mdma_set_xfer_param(chan, direction, &ccr,
 754                                                         &ctcr, &ctbr, src_addr,
 755                                                         sg_dma_len(sg));
 756                         stm32_mdma_set_bus(dmadev, &ctbr, STM32_MDMA_CTBR_SBUS,
 757                                            src_addr);
 758                 } else {
 759                         src_addr = dma_config->src_addr;
 760                         if (chan_config->m2m_hw && (i & 1))
 761                                 src_addr += m2m_hw_period;
 762                         dst_addr = sg_dma_address(sg);
 763                         ret = stm32_mdma_set_xfer_param(chan, direction, &ccr,
 764                                                         &ctcr, &ctbr, dst_addr,
 765                                                         sg_dma_len(sg));
 766                         stm32_mdma_set_bus(dmadev, &ctbr, STM32_MDMA_CTBR_DBUS,
 767                                            dst_addr);
 768                 }
 769
 770                 if (ret < 0)
 771                         return ret;
 772
 773                 stm32_mdma_setup_hwdesc(chan, desc, direction, i, src_addr,
 774                                         dst_addr, sg_dma_len(sg), ctcr, ctbr,
 775                                         i == sg_len - 1, i == 0, false);
 776         }
 777
 778         /* Enable interrupts */
 779         ccr &= ~STM32_MDMA_CCR_IRQ_MASK;
 780         ccr |= STM32_MDMA_CCR_TEIE | STM32_MDMA_CCR_CTCIE;
 781         if (sg_len > 1)
 782                 ccr |= STM32_MDMA_CCR_BTIE;
 783         desc->ccr = ccr;
 784
 785         return 0;
 786 }
 787
 788 static struct dma_async_tx_descriptor *
 789 stm32_mdma_prep_slave_sg(struct dma_chan *c, struct scatterlist *sgl,
 790                          u32 sg_len, enum dma_transfer_direction direction,
 791                          unsigned long flags, void *context)
 792 {
 793         struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
 794         struct stm32_mdma_chan_config *chan_config = &chan->chan_config;
 795         struct stm32_mdma_desc *desc;
 796         int i, ret;
 797
 798         /*
 799          * Once DMA is in setup cyclic mode the channel we cannot assign this
 800          * channel anymore. The DMA channel needs to be aborted or terminated
 801          * for allowing another request.
 802          */
 803         if (chan->desc && chan->desc->cyclic) {
 804                 dev_err(chan2dev(chan),
 805                         "Request not allowed when dma in cyclic mode\n");
 806                 return NULL;
 807         }
 808
 809         desc = stm32_mdma_alloc_desc(chan, sg_len);
 810         if (!desc)
 811                 return NULL;
 812
 813         ret = stm32_mdma_setup_xfer(chan, desc, sgl, sg_len, direction);
 814         if (ret < 0)
 815                 goto xfer_setup_err;
 816
 817         /*
 818          * In case of M2M HW transfer triggered by STM32 DMA, we do not have to clear the
 819          * transfer complete flag by hardware in order to let the CPU rearm the STM32 DMA
 820          * with the next sg element and update some data in dmaengine framework.
 821          */
 822         if (chan_config->m2m_hw && direction == DMA_MEM_TO_DEV) {
 823                 struct stm32_mdma_hwdesc *hwdesc;
 824
 825                 for (i = 0; i < sg_len; i++) {
 826                         hwdesc = desc->node[i].hwdesc;
 827                         hwdesc->cmar = 0;
 828                         hwdesc->cmdr = 0;
 829                 }
 830         }
 831
 832         desc->cyclic = false;
 833
 834         return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags);
 835
 836 xfer_setup_err:
 837         for (i = 0; i < desc->count; i++)
 838                 dma_pool_free(chan->desc_pool, desc->node[i].hwdesc,
 839                               desc->node[i].hwdesc_phys);
 840         kfree(desc);
 841         return NULL;
 842 }
 843
 844 static struct dma_async_tx_descriptor *
 845 stm32_mdma_prep_dma_cyclic(struct dma_chan *c, dma_addr_t buf_addr,
 846                            size_t buf_len, size_t period_len,
 847                            enum dma_transfer_direction direction,
 848                            unsigned long flags)
 849 {
 850         struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
 851         struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
 852         struct dma_slave_config *dma_config = &chan->dma_config;
 853         struct stm32_mdma_chan_config *chan_config = &chan->chan_config;
 854         struct stm32_mdma_desc *desc;
 855         dma_addr_t src_addr, dst_addr;
 856         u32 ccr, ctcr, ctbr, count;
 857         int i, ret;
 858
 859         /*
 860          * Once DMA is in setup cyclic mode the channel we cannot assign this
 861          * channel anymore. The DMA channel needs to be aborted or terminated
 862          * for allowing another request.
 863          */
 864         if (chan->desc && chan->desc->cyclic) {
 865                 dev_err(chan2dev(chan),
 866                         "Request not allowed when dma in cyclic mode\n");
 867                 return NULL;
 868         }
 869
 870         if (!buf_len || !period_len || period_len > STM32_MDMA_MAX_BLOCK_LEN) {
 871                 dev_err(chan2dev(chan), "Invalid buffer/period len\n");
 872                 return NULL;
 873         }
 874
 875         if (buf_len % period_len) {
 876                 dev_err(chan2dev(chan), "buf_len not multiple of period_len\n");
 877                 return NULL;
 878         }
 879
 880         count = buf_len / period_len;
 881
 882         desc = stm32_mdma_alloc_desc(chan, count);
 883         if (!desc)
 884                 return NULL;
 885
 886         /* Select bus */
 887         if (direction == DMA_MEM_TO_DEV) {
 888                 src_addr = buf_addr;
 889                 ret = stm32_mdma_set_xfer_param(chan, direction, &ccr, &ctcr,
 890                                                 &ctbr, src_addr, period_len);
 891                 stm32_mdma_set_bus(dmadev, &ctbr, STM32_MDMA_CTBR_SBUS,
 892                                    src_addr);
 893         } else {
 894                 dst_addr = buf_addr;
 895                 ret = stm32_mdma_set_xfer_param(chan, direction, &ccr, &ctcr,
 896                                                 &ctbr, dst_addr, period_len);
 897                 stm32_mdma_set_bus(dmadev, &ctbr, STM32_MDMA_CTBR_DBUS,
 898                                    dst_addr);
 899         }
 900
 901         if (ret < 0)
 902                 goto xfer_setup_err;
 903
 904         /* Enable interrupts */
 905         ccr &= ~STM32_MDMA_CCR_IRQ_MASK;
 906         ccr |= STM32_MDMA_CCR_TEIE | STM32_MDMA_CCR_CTCIE | STM32_MDMA_CCR_BTIE;
 907         desc->ccr = ccr;
 908
 909         /* Configure hwdesc list */
 910         for (i = 0; i < count; i++) {
 911                 if (direction == DMA_MEM_TO_DEV) {
 912                         src_addr = buf_addr + i * period_len;
 913                         dst_addr = dma_config->dst_addr;
 914                         if (chan_config->m2m_hw && (i & 1))
 915                                 dst_addr += period_len;
 916                 } else {
 917                         src_addr = dma_config->src_addr;
 918                         if (chan_config->m2m_hw && (i & 1))
 919                                 src_addr += period_len;
 920                         dst_addr = buf_addr + i * period_len;
 921                 }
 922
 923                 stm32_mdma_setup_hwdesc(chan, desc, direction, i, src_addr,
 924                                         dst_addr, period_len, ctcr, ctbr,
 925                                         i == count - 1, i == 0, true);
 926         }
 927
 928         desc->cyclic = true;
 929
 930         return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags);
 931
 932 xfer_setup_err:
 933         for (i = 0; i < desc->count; i++)
 934                 dma_pool_free(chan->desc_pool, desc->node[i].hwdesc,
 935                               desc->node[i].hwdesc_phys);
 936         kfree(desc);
 937         return NULL;
 938 }
 939
 940 static struct dma_async_tx_descriptor *
 941 stm32_mdma_prep_dma_memcpy(struct dma_chan *c, dma_addr_t dest, dma_addr_t src,
 942                            size_t len, unsigned long flags)
 943 {
 944         struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
 945         struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
 946         enum dma_slave_buswidth max_width;
 947         struct stm32_mdma_desc *desc;
 948         struct stm32_mdma_hwdesc *hwdesc;
 949         u32 ccr, ctcr, ctbr, cbndtr, count, max_burst, mdma_burst;
 950         u32 best_burst, tlen;
 951         size_t xfer_count, offset;
 952         int src_bus_width, dst_bus_width;
 953         int i;
 954
 955         /*
 956          * Once DMA is in setup cyclic mode the channel we cannot assign this
 957          * channel anymore. The DMA channel needs to be aborted or terminated
 958          * to allow another request
 959          */
 960         if (chan->desc && chan->desc->cyclic) {
 961                 dev_err(chan2dev(chan),
 962                         "Request not allowed when dma in cyclic mode\n");
 963                 return NULL;
 964         }
 965
 966         count = DIV_ROUND_UP(len, STM32_MDMA_MAX_BLOCK_LEN);
 967         desc = stm32_mdma_alloc_desc(chan, count);
 968         if (!desc)
 969                 return NULL;
 970
 971         ccr = stm32_mdma_read(dmadev, STM32_MDMA_CCR(chan->id));
 972         ctcr = stm32_mdma_read(dmadev, STM32_MDMA_CTCR(chan->id));
 973         ctbr = stm32_mdma_read(dmadev, STM32_MDMA_CTBR(chan->id));
 974         cbndtr = stm32_mdma_read(dmadev, STM32_MDMA_CBNDTR(chan->id));
 975
 976         /* Enable sw req, some interrupts and clear other bits */
 977         ccr &= ~(STM32_MDMA_CCR_WEX | STM32_MDMA_CCR_HEX |
 978                  STM32_MDMA_CCR_BEX | STM32_MDMA_CCR_PL_MASK |
 979                  STM32_MDMA_CCR_IRQ_MASK);
 980         ccr |= STM32_MDMA_CCR_TEIE;
 981
 982         /* Enable SW request mode, dest/src inc and clear other bits */
 983         ctcr &= ~(STM32_MDMA_CTCR_BWM | STM32_MDMA_CTCR_TRGM_MSK |
 984                   STM32_MDMA_CTCR_PAM_MASK | STM32_MDMA_CTCR_PKE |
 985                   STM32_MDMA_CTCR_TLEN_MSK | STM32_MDMA_CTCR_DBURST_MASK |
 986                   STM32_MDMA_CTCR_SBURST_MASK | STM32_MDMA_CTCR_DINCOS_MASK |
 987                   STM32_MDMA_CTCR_SINCOS_MASK | STM32_MDMA_CTCR_DSIZE_MASK |
 988                   STM32_MDMA_CTCR_SSIZE_MASK | STM32_MDMA_CTCR_DINC_MASK |
 989                   STM32_MDMA_CTCR_SINC_MASK);
 990         ctcr |= STM32_MDMA_CTCR_SWRM | STM32_MDMA_CTCR_SINC(STM32_MDMA_INC) |
 991                 STM32_MDMA_CTCR_DINC(STM32_MDMA_INC);
 992
 993         /* Reset HW request */
 994         ctbr &= ~STM32_MDMA_CTBR_TSEL_MASK;
 995
 996         /* Select bus */
 997         stm32_mdma_set_bus(dmadev, &ctbr, STM32_MDMA_CTBR_SBUS, src);
 998         stm32_mdma_set_bus(dmadev, &ctbr, STM32_MDMA_CTBR_DBUS, dest);
 999
1000         /* Clear CBNDTR registers */
1001         cbndtr &= ~(STM32_MDMA_CBNDTR_BRC_MK | STM32_MDMA_CBNDTR_BRDUM |
1002                         STM32_MDMA_CBNDTR_BRSUM | STM32_MDMA_CBNDTR_BNDT_MASK);
1003
1004         if (len <= STM32_MDMA_MAX_BLOCK_LEN) {
1005                 cbndtr |= STM32_MDMA_CBNDTR_BNDT(len);
1006                 if (len <= STM32_MDMA_MAX_BUF_LEN) {
1007                         /* Setup a buffer transfer */
1008                         ccr |= STM32_MDMA_CCR_TCIE | STM32_MDMA_CCR_CTCIE;
1009                         ctcr |= STM32_MDMA_CTCR_TRGM(STM32_MDMA_BUFFER);
1010                 } else {
1011                         /* Setup a block transfer */
1012                         ccr |= STM32_MDMA_CCR_BTIE | STM32_MDMA_CCR_CTCIE;
1013                         ctcr |= STM32_MDMA_CTCR_TRGM(STM32_MDMA_BLOCK);
1014                 }
1015
1016                 tlen = STM32_MDMA_MAX_BUF_LEN;
1017                 ctcr |= STM32_MDMA_CTCR_TLEN((tlen - 1));
1018
1019                 /* Set source best burst size */
1020                 max_width = stm32_mdma_get_max_width(src, len, tlen);
1021                 src_bus_width = stm32_mdma_get_width(chan, max_width);
1022
1023                 max_burst = tlen / max_width;
1024                 best_burst = stm32_mdma_get_best_burst(len, tlen, max_burst,
1025                                                        max_width);
1026                 mdma_burst = ilog2(best_burst);
1027
1028                 ctcr |= STM32_MDMA_CTCR_SBURST(mdma_burst) |
1029                         STM32_MDMA_CTCR_SSIZE(src_bus_width) |
1030                         STM32_MDMA_CTCR_SINCOS(src_bus_width);
1031
1032                 /* Set destination best burst size */
1033                 max_width = stm32_mdma_get_max_width(dest, len, tlen);
1034                 dst_bus_width = stm32_mdma_get_width(chan, max_width);
1035
1036                 max_burst = tlen / max_width;
1037                 best_burst = stm32_mdma_get_best_burst(len, tlen, max_burst,
1038                                                        max_width);
1039                 mdma_burst = ilog2(best_burst);
1040
1041                 ctcr |= STM32_MDMA_CTCR_DBURST(mdma_burst) |
1042                         STM32_MDMA_CTCR_DSIZE(dst_bus_width) |
1043                         STM32_MDMA_CTCR_DINCOS(dst_bus_width);
1044
1045                 if (dst_bus_width != src_bus_width)
1046                         ctcr |= STM32_MDMA_CTCR_PKE;
1047
1048                 /* Prepare hardware descriptor */
1049                 hwdesc = desc->node[0].hwdesc;
1050                 hwdesc->ctcr = ctcr;
1051                 hwdesc->cbndtr = cbndtr;
1052                 hwdesc->csar = src;
1053                 hwdesc->cdar = dest;
1054                 hwdesc->cbrur = 0;
1055                 hwdesc->clar = 0;
1056                 hwdesc->ctbr = ctbr;
1057                 hwdesc->cmar = 0;
1058                 hwdesc->cmdr = 0;
1059
1060                 stm32_mdma_dump_hwdesc(chan, &desc->node[0]);
1061         } else {
1062                 /* Setup a LLI transfer */
1063                 ctcr |= STM32_MDMA_CTCR_TRGM(STM32_MDMA_LINKED_LIST) |
1064                         STM32_MDMA_CTCR_TLEN((STM32_MDMA_MAX_BUF_LEN - 1));
1065                 ccr |= STM32_MDMA_CCR_BTIE | STM32_MDMA_CCR_CTCIE;
1066                 tlen = STM32_MDMA_MAX_BUF_LEN;
1067
1068                 for (i = 0, offset = 0; offset < len;
1069                      i++, offset += xfer_count) {
1070                         xfer_count = min_t(size_t, len - offset,
1071                                            STM32_MDMA_MAX_BLOCK_LEN);
1072
1073                         /* Set source best burst size */
1074                         max_width = stm32_mdma_get_max_width(src, len, tlen);
1075                         src_bus_width = stm32_mdma_get_width(chan, max_width);
1076
1077                         max_burst = tlen / max_width;
1078                         best_burst = stm32_mdma_get_best_burst(len, tlen,
1079                                                                max_burst,
1080                                                                max_width);
1081                         mdma_burst = ilog2(best_burst);
1082
1083                         ctcr |= STM32_MDMA_CTCR_SBURST(mdma_burst) |
1084                                 STM32_MDMA_CTCR_SSIZE(src_bus_width) |
1085                                 STM32_MDMA_CTCR_SINCOS(src_bus_width);
1086
1087                         /* Set destination best burst size */
1088                         max_width = stm32_mdma_get_max_width(dest, len, tlen);
1089                         dst_bus_width = stm32_mdma_get_width(chan, max_width);
1090
1091                         max_burst = tlen / max_width;
1092                         best_burst = stm32_mdma_get_best_burst(len, tlen,
1093                                                                max_burst,
1094                                                                max_width);
1095                         mdma_burst = ilog2(best_burst);
1096
1097                         ctcr |= STM32_MDMA_CTCR_DBURST(mdma_burst) |
1098                                 STM32_MDMA_CTCR_DSIZE(dst_bus_width) |
1099                                 STM32_MDMA_CTCR_DINCOS(dst_bus_width);
1100
1101                         if (dst_bus_width != src_bus_width)
1102                                 ctcr |= STM32_MDMA_CTCR_PKE;
1103
1104                         /* Prepare hardware descriptor */
1105                         stm32_mdma_setup_hwdesc(chan, desc, DMA_MEM_TO_MEM, i,
1106                                                 src + offset, dest + offset,
1107                                                 xfer_count, ctcr, ctbr,
1108                                                 i == count - 1, i == 0, false);
1109                 }
1110         }
1111
1112         desc->ccr = ccr;
1113
1114         desc->cyclic = false;
1115
1116         return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags);
1117 }
1118
1119 static void stm32_mdma_dump_reg(struct stm32_mdma_chan *chan)
1120 {
1121         struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
1122
1123         dev_dbg(chan2dev(chan), "CCR:     0x%08x\n",
1124                 stm32_mdma_read(dmadev, STM32_MDMA_CCR(chan->id)));
1125         dev_dbg(chan2dev(chan), "CTCR:    0x%08x\n",
1126                 stm32_mdma_read(dmadev, STM32_MDMA_CTCR(chan->id)));
1127         dev_dbg(chan2dev(chan), "CBNDTR:  0x%08x\n",
1128                 stm32_mdma_read(dmadev, STM32_MDMA_CBNDTR(chan->id)));
1129         dev_dbg(chan2dev(chan), "CSAR:    0x%08x\n",
1130                 stm32_mdma_read(dmadev, STM32_MDMA_CSAR(chan->id)));
1131         dev_dbg(chan2dev(chan), "CDAR:    0x%08x\n",
1132                 stm32_mdma_read(dmadev, STM32_MDMA_CDAR(chan->id)));
1133         dev_dbg(chan2dev(chan), "CBRUR:   0x%08x\n",
1134                 stm32_mdma_read(dmadev, STM32_MDMA_CBRUR(chan->id)));
1135         dev_dbg(chan2dev(chan), "CLAR:    0x%08x\n",
1136                 stm32_mdma_read(dmadev, STM32_MDMA_CLAR(chan->id)));
1137         dev_dbg(chan2dev(chan), "CTBR:    0x%08x\n",
1138                 stm32_mdma_read(dmadev, STM32_MDMA_CTBR(chan->id)));
1139         dev_dbg(chan2dev(chan), "CMAR:    0x%08x\n",
1140                 stm32_mdma_read(dmadev, STM32_MDMA_CMAR(chan->id)));
1141         dev_dbg(chan2dev(chan), "CMDR:    0x%08x\n",
1142                 stm32_mdma_read(dmadev, STM32_MDMA_CMDR(chan->id)));
1143 }
1144
1145 static void stm32_mdma_start_transfer(struct stm32_mdma_chan *chan)
1146 {
1147         struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
1148         struct virt_dma_desc *vdesc;
1149         struct stm32_mdma_hwdesc *hwdesc;
1150         u32 id = chan->id;
1151         u32 status, reg;
1152
1153         vdesc = vchan_next_desc(&chan->vchan);
1154         if (!vdesc) {
1155                 chan->desc = NULL;
1156                 return;
1157         }
1158
1159         list_del(&vdesc->node);
1160
1161         chan->desc = to_stm32_mdma_desc(vdesc);
1162         hwdesc = chan->desc->node[0].hwdesc;
1163         chan->curr_hwdesc = 0;
1164
1165         stm32_mdma_write(dmadev, STM32_MDMA_CCR(id), chan->desc->ccr);
1166         stm32_mdma_write(dmadev, STM32_MDMA_CTCR(id), hwdesc->ctcr);
1167         stm32_mdma_write(dmadev, STM32_MDMA_CBNDTR(id), hwdesc->cbndtr);
1168         stm32_mdma_write(dmadev, STM32_MDMA_CSAR(id), hwdesc->csar);
1169         stm32_mdma_write(dmadev, STM32_MDMA_CDAR(id), hwdesc->cdar);
1170         stm32_mdma_write(dmadev, STM32_MDMA_CBRUR(id), hwdesc->cbrur);
1171         stm32_mdma_write(dmadev, STM32_MDMA_CLAR(id), hwdesc->clar);
1172         stm32_mdma_write(dmadev, STM32_MDMA_CTBR(id), hwdesc->ctbr);
1173         stm32_mdma_write(dmadev, STM32_MDMA_CMAR(id), hwdesc->cmar);
1174         stm32_mdma_write(dmadev, STM32_MDMA_CMDR(id), hwdesc->cmdr);
1175
1176         /* Clear interrupt status if it is there */
1177         status = stm32_mdma_read(dmadev, STM32_MDMA_CISR(id));
1178         if (status)
1179                 stm32_mdma_set_bits(dmadev, STM32_MDMA_CIFCR(id), status);
1180
1181         stm32_mdma_dump_reg(chan);
1182
1183         /* Start DMA */
1184         stm32_mdma_set_bits(dmadev, STM32_MDMA_CCR(id), STM32_MDMA_CCR_EN);
1185
1186         /* Set SW request in case of MEM2MEM transfer */
1187         if (hwdesc->ctcr & STM32_MDMA_CTCR_SWRM) {
1188                 reg = STM32_MDMA_CCR(id);
1189                 stm32_mdma_set_bits(dmadev, reg, STM32_MDMA_CCR_SWRQ);
1190         }
1191
1192         chan->busy = true;
1193
1194         dev_dbg(chan2dev(chan), "vchan %pK: started\n", &chan->vchan);
1195 }
1196
1197 static void stm32_mdma_issue_pending(struct dma_chan *c)
1198 {
1199         struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
1200         unsigned long flags;
1201
1202         spin_lock_irqsave(&chan->vchan.lock, flags);
1203
1204         if (!vchan_issue_pending(&chan->vchan))
1205                 goto end;
1206
1207         dev_dbg(chan2dev(chan), "vchan %pK: issued\n", &chan->vchan);
1208
1209         if (!chan->desc && !chan->busy)
1210                 stm32_mdma_start_transfer(chan);
1211
1212 end:
1213         spin_unlock_irqrestore(&chan->vchan.lock, flags);
1214 }
1215
1216 static int stm32_mdma_pause(struct dma_chan *c)
1217 {
1218         struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
1219         unsigned long flags;
1220         int ret;
1221
1222         spin_lock_irqsave(&chan->vchan.lock, flags);
1223         ret = stm32_mdma_disable_chan(chan);
1224         spin_unlock_irqrestore(&chan->vchan.lock, flags);
1225
1226         if (!ret)
1227                 dev_dbg(chan2dev(chan), "vchan %pK: pause\n", &chan->vchan);
1228
1229         return ret;
1230 }
1231
1232 static int stm32_mdma_resume(struct dma_chan *c)
1233 {
1234         struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
1235         struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
1236         struct stm32_mdma_hwdesc *hwdesc;
1237         unsigned long flags;
1238         u32 status, reg;
1239
1240         hwdesc = chan->desc->node[chan->curr_hwdesc].hwdesc;
1241
1242         spin_lock_irqsave(&chan->vchan.lock, flags);
1243
1244         /* Re-configure control register */
1245         stm32_mdma_write(dmadev, STM32_MDMA_CCR(chan->id), chan->desc->ccr);
1246
1247         /* Clear interrupt status if it is there */
1248         status = stm32_mdma_read(dmadev, STM32_MDMA_CISR(chan->id));
1249         if (status)
1250                 stm32_mdma_set_bits(dmadev, STM32_MDMA_CIFCR(chan->id), status);
1251
1252         stm32_mdma_dump_reg(chan);
1253
1254         /* Re-start DMA */
1255         reg = STM32_MDMA_CCR(chan->id);
1256         stm32_mdma_set_bits(dmadev, reg, STM32_MDMA_CCR_EN);
1257
1258         /* Set SW request in case of MEM2MEM transfer */
1259         if (hwdesc->ctcr & STM32_MDMA_CTCR_SWRM)
1260                 stm32_mdma_set_bits(dmadev, reg, STM32_MDMA_CCR_SWRQ);
1261
1262         spin_unlock_irqrestore(&chan->vchan.lock, flags);
1263
1264         dev_dbg(chan2dev(chan), "vchan %pK: resume\n", &chan->vchan);
1265
1266         return 0;
1267 }
1268
1269 static int stm32_mdma_terminate_all(struct dma_chan *c)
1270 {
1271         struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
1272         unsigned long flags;
1273         LIST_HEAD(head);
1274
1275         spin_lock_irqsave(&chan->vchan.lock, flags);
1276         if (chan->desc) {
1277                 vchan_terminate_vdesc(&chan->desc->vdesc);
1278                 if (chan->busy)
1279                         stm32_mdma_stop(chan);
1280                 chan->desc = NULL;
1281         }
1282         vchan_get_all_descriptors(&chan->vchan, &head);
1283         spin_unlock_irqrestore(&chan->vchan.lock, flags);
1284
1285         vchan_dma_desc_free_list(&chan->vchan, &head);
1286
1287         return 0;
1288 }
1289
1290 static void stm32_mdma_synchronize(struct dma_chan *c)
1291 {
1292         struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
1293
1294         vchan_synchronize(&chan->vchan);
1295 }
1296
1297 static int stm32_mdma_slave_config(struct dma_chan *c,
1298                                    struct dma_slave_config *config)
1299 {
1300         struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
1301
1302         memcpy(&chan->dma_config, config, sizeof(*config));
1303
1304         /* Check if user is requesting STM32 DMA to trigger MDMA */
1305         if (config->peripheral_size) {
1306                 struct stm32_mdma_dma_config *mdma_config;
1307
1308                 mdma_config = (struct stm32_mdma_dma_config *)chan->dma_config.peripheral_config;
1309                 chan->chan_config.request = mdma_config->request;
1310                 chan->chan_config.mask_addr = mdma_config->cmar;
1311                 chan->chan_config.mask_data = mdma_config->cmdr;
1312                 chan->chan_config.m2m_hw = true;
1313         }
1314
1315         return 0;
1316 }
1317
1318 static size_t stm32_mdma_desc_residue(struct stm32_mdma_chan *chan,
1319                                       struct stm32_mdma_desc *desc,
1320                                       u32 curr_hwdesc)
1321 {
1322         struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
1323         struct stm32_mdma_hwdesc *hwdesc;
1324         u32 cbndtr, residue, modulo, burst_size;
1325         int i;
1326
1327         residue = 0;
1328         for (i = curr_hwdesc + 1; i < desc->count; i++) {
1329                 hwdesc = desc->node[i].hwdesc;
1330                 residue += STM32_MDMA_CBNDTR_BNDT(hwdesc->cbndtr);
1331         }
1332         cbndtr = stm32_mdma_read(dmadev, STM32_MDMA_CBNDTR(chan->id));
1333         residue += cbndtr & STM32_MDMA_CBNDTR_BNDT_MASK;
1334
1335         if (!chan->mem_burst)
1336                 return residue;
1337
1338         burst_size = chan->mem_burst * chan->mem_width;
1339         modulo = residue % burst_size;
1340         if (modulo)
1341                 residue = residue - modulo + burst_size;
1342
1343         return residue;
1344 }
1345
1346 static enum dma_status stm32_mdma_tx_status(struct dma_chan *c,
1347                                             dma_cookie_t cookie,
1348                                             struct dma_tx_state *state)
1349 {
1350         struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
1351         struct virt_dma_desc *vdesc;
1352         enum dma_status status;
1353         unsigned long flags;
1354         u32 residue = 0;
1355
1356         status = dma_cookie_status(c, cookie, state);
1357         if ((status == DMA_COMPLETE) || (!state))
1358                 return status;
1359
1360         spin_lock_irqsave(&chan->vchan.lock, flags);
1361
1362         vdesc = vchan_find_desc(&chan->vchan, cookie);
1363         if (chan->desc && cookie == chan->desc->vdesc.tx.cookie)
1364                 residue = stm32_mdma_desc_residue(chan, chan->desc,
1365                                                   chan->curr_hwdesc);
1366         else if (vdesc)
1367                 residue = stm32_mdma_desc_residue(chan,
1368                                                   to_stm32_mdma_desc(vdesc), 0);
1369         dma_set_residue(state, residue);
1370
1371         spin_unlock_irqrestore(&chan->vchan.lock, flags);
1372
1373         return status;
1374 }
1375
1376 static void stm32_mdma_xfer_end(struct stm32_mdma_chan *chan)
1377 {
1378         vchan_cookie_complete(&chan->desc->vdesc);
1379         chan->desc = NULL;
1380         chan->busy = false;
1381
1382         /* Start the next transfer if this driver has a next desc */
1383         stm32_mdma_start_transfer(chan);
1384 }
1385
1386 static irqreturn_t stm32_mdma_irq_handler(int irq, void *devid)
1387 {
1388         struct stm32_mdma_device *dmadev = devid;
1389         struct stm32_mdma_chan *chan;
1390         u32 reg, id, ccr, ien, status;
1391
1392         /* Find out which channel generates the interrupt */
1393         status = readl_relaxed(dmadev->base + STM32_MDMA_GISR0);
1394         if (!status) {
1395                 dev_dbg(mdma2dev(dmadev), "spurious it\n");
1396                 return IRQ_NONE;
1397         }
1398         id = __ffs(status);
1399         chan = &dmadev->chan[id];
1400
1401         /* Handle interrupt for the channel */
1402         spin_lock(&chan->vchan.lock);
1403         status = stm32_mdma_read(dmadev, STM32_MDMA_CISR(id));
1404         /* Mask Channel ReQuest Active bit which can be set in case of MEM2MEM */
1405         status &= ~STM32_MDMA_CISR_CRQA;
1406         ccr = stm32_mdma_read(dmadev, STM32_MDMA_CCR(id));
1407         ien = (ccr & STM32_MDMA_CCR_IRQ_MASK) >> 1;
1408
1409         if (!(status & ien)) {
1410                 spin_unlock(&chan->vchan.lock);
1411                 if (chan->busy)
1412                         dev_warn(chan2dev(chan),
1413                                  "spurious it (status=0x%04x, ien=0x%04x)\n", status, ien);
1414                 else
1415                         dev_dbg(chan2dev(chan),
1416                                 "spurious it (status=0x%04x, ien=0x%04x)\n", status, ien);
1417                 return IRQ_NONE;
1418         }
1419
1420         reg = STM32_MDMA_CIFCR(id);
1421
1422         if (status & STM32_MDMA_CISR_TEIF) {
1423                 dev_err(chan2dev(chan), "Transfer Err: stat=0x%08x\n",
1424                         readl_relaxed(dmadev->base + STM32_MDMA_CESR(id)));
1425                 stm32_mdma_set_bits(dmadev, reg, STM32_MDMA_CIFCR_CTEIF);
1426                 status &= ~STM32_MDMA_CISR_TEIF;
1427         }
1428
1429         if (status & STM32_MDMA_CISR_CTCIF) {
1430                 stm32_mdma_set_bits(dmadev, reg, STM32_MDMA_CIFCR_CCTCIF);
1431                 status &= ~STM32_MDMA_CISR_CTCIF;
1432                 stm32_mdma_xfer_end(chan);
1433         }
1434
1435         if (status & STM32_MDMA_CISR_BRTIF) {
1436                 stm32_mdma_set_bits(dmadev, reg, STM32_MDMA_CIFCR_CBRTIF);
1437                 status &= ~STM32_MDMA_CISR_BRTIF;
1438         }
1439
1440         if (status & STM32_MDMA_CISR_BTIF) {
1441                 stm32_mdma_set_bits(dmadev, reg, STM32_MDMA_CIFCR_CBTIF);
1442                 status &= ~STM32_MDMA_CISR_BTIF;
1443                 chan->curr_hwdesc++;
1444                 if (chan->desc && chan->desc->cyclic) {
1445                         if (chan->curr_hwdesc == chan->desc->count)
1446                                 chan->curr_hwdesc = 0;
1447                         vchan_cyclic_callback(&chan->desc->vdesc);
1448                 }
1449         }
1450
1451         if (status & STM32_MDMA_CISR_TCIF) {
1452                 stm32_mdma_set_bits(dmadev, reg, STM32_MDMA_CIFCR_CLTCIF);
1453                 status &= ~STM32_MDMA_CISR_TCIF;
1454         }
1455
1456         if (status) {
1457                 stm32_mdma_set_bits(dmadev, reg, status);
1458                 dev_err(chan2dev(chan), "DMA error: status=0x%08x\n", status);
1459                 if (!(ccr & STM32_MDMA_CCR_EN))
1460                         dev_err(chan2dev(chan), "chan disabled by HW\n");
1461         }
1462
1463         spin_unlock(&chan->vchan.lock);
1464
1465         return IRQ_HANDLED;
1466 }
1467
1468 static int stm32_mdma_alloc_chan_resources(struct dma_chan *c)
1469 {
1470         struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
1471         struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
1472         int ret;
1473
1474         chan->desc_pool = dmam_pool_create(dev_name(&c->dev->device),
1475                                            c->device->dev,
1476                                            sizeof(struct stm32_mdma_hwdesc),
1477                                           __alignof__(struct stm32_mdma_hwdesc),
1478                                            0);
1479         if (!chan->desc_pool) {
1480                 dev_err(chan2dev(chan), "failed to allocate descriptor pool\n");
1481                 return -ENOMEM;
1482         }
1483
1484         ret = pm_runtime_resume_and_get(dmadev->ddev.dev);
1485         if (ret < 0)
1486                 return ret;
1487
1488         ret = stm32_mdma_disable_chan(chan);
1489         if (ret < 0)
1490                 pm_runtime_put(dmadev->ddev.dev);
1491
1492         return ret;
1493 }
1494
1495 static void stm32_mdma_free_chan_resources(struct dma_chan *c)
1496 {
1497         struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
1498         struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
1499         unsigned long flags;
1500
1501         dev_dbg(chan2dev(chan), "Freeing channel %d\n", chan->id);
1502
1503         if (chan->busy) {
1504                 spin_lock_irqsave(&chan->vchan.lock, flags);
1505                 stm32_mdma_stop(chan);
1506                 chan->desc = NULL;
1507                 spin_unlock_irqrestore(&chan->vchan.lock, flags);
1508         }
1509
1510         pm_runtime_put(dmadev->ddev.dev);
1511         vchan_free_chan_resources(to_virt_chan(c));
1512         dmam_pool_destroy(chan->desc_pool);
1513         chan->desc_pool = NULL;
1514 }
1515
1516 static bool stm32_mdma_filter_fn(struct dma_chan *c, void *fn_param)
1517 {
1518         struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
1519         struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
1520
1521         /* Check if chan is marked Secure */
1522         if (dmadev->chan_reserved & BIT(chan->id))
1523                 return false;
1524
1525         return true;
1526 }
1527
1528 static struct dma_chan *stm32_mdma_of_xlate(struct of_phandle_args *dma_spec,
1529                                             struct of_dma *ofdma)
1530 {
1531         struct stm32_mdma_device *dmadev = ofdma->of_dma_data;
1532         dma_cap_mask_t mask = dmadev->ddev.cap_mask;
1533         struct stm32_mdma_chan *chan;
1534         struct dma_chan *c;
1535         struct stm32_mdma_chan_config config;
1536
1537         if (dma_spec->args_count < 5) {
1538                 dev_err(mdma2dev(dmadev), "Bad number of args\n");
1539                 return NULL;
1540         }
1541
1542         memset(&config, 0, sizeof(config));
1543         config.request = dma_spec->args[0];
1544         config.priority_level = dma_spec->args[1];
1545         config.transfer_config = dma_spec->args[2];
1546         config.mask_addr = dma_spec->args[3];
1547         config.mask_data = dma_spec->args[4];
1548
1549         if (config.request >= dmadev->nr_requests) {
1550                 dev_err(mdma2dev(dmadev), "Bad request line\n");
1551                 return NULL;
1552         }
1553
1554         if (config.priority_level > STM32_MDMA_VERY_HIGH_PRIORITY) {
1555                 dev_err(mdma2dev(dmadev), "Priority level not supported\n");
1556                 return NULL;
1557         }
1558
1559         c = __dma_request_channel(&mask, stm32_mdma_filter_fn, &config, ofdma->of_node);
1560         if (!c) {
1561                 dev_err(mdma2dev(dmadev), "No more channels available\n");
1562                 return NULL;
1563         }
1564
1565         chan = to_stm32_mdma_chan(c);
1566         chan->chan_config = config;
1567
1568         return c;
1569 }
1570
1571 static const struct of_device_id stm32_mdma_of_match[] = {
1572         { .compatible = "st,stm32h7-mdma", },
1573         { /* sentinel */ },
1574 };
1575 MODULE_DEVICE_TABLE(of, stm32_mdma_of_match);
1576
1577 static int stm32_mdma_probe(struct platform_device *pdev)
1578 {
1579         struct stm32_mdma_chan *chan;
1580         struct stm32_mdma_device *dmadev;
1581         struct dma_device *dd;
1582         struct device_node *of_node;
1583         struct reset_control *rst;
1584         u32 nr_channels, nr_requests;
1585         int i, count, ret;
1586
1587         of_node = pdev->dev.of_node;
1588         if (!of_node)
1589                 return -ENODEV;
1590
1591         ret = device_property_read_u32(&pdev->dev, "dma-channels",
1592                                        &nr_channels);
1593         if (ret) {
1594                 nr_channels = STM32_MDMA_MAX_CHANNELS;
1595                 dev_warn(&pdev->dev, "MDMA defaulting on %i channels\n",
1596                          nr_channels);
1597         }
1598
1599         ret = device_property_read_u32(&pdev->dev, "dma-requests",
1600                                        &nr_requests);
1601         if (ret) {
1602                 nr_requests = STM32_MDMA_MAX_REQUESTS;
1603                 dev_warn(&pdev->dev, "MDMA defaulting on %i request lines\n",
1604                          nr_requests);
1605         }
1606
1607         count = device_property_count_u32(&pdev->dev, "st,ahb-addr-masks");
1608         if (count < 0)
1609                 count = 0;
1610
1611         dmadev = devm_kzalloc(&pdev->dev,
1612                               struct_size(dmadev, ahb_addr_masks, count),
1613                               GFP_KERNEL);
1614         if (!dmadev)
1615                 return -ENOMEM;
1616
1617         dmadev->nr_channels = nr_channels;
1618         dmadev->nr_requests = nr_requests;
1619         device_property_read_u32_array(&pdev->dev, "st,ahb-addr-masks",
1620                                        dmadev->ahb_addr_masks,
1621                                        count);
1622         dmadev->nr_ahb_addr_masks = count;
1623
1624         dmadev->base = devm_platform_ioremap_resource(pdev, 0);
1625         if (IS_ERR(dmadev->base))
1626                 return PTR_ERR(dmadev->base);
1627
1628         dmadev->clk = devm_clk_get(&pdev->dev, NULL);
1629         if (IS_ERR(dmadev->clk))
1630                 return dev_err_probe(&pdev->dev, PTR_ERR(dmadev->clk),
1631                                      "Missing clock controller\n");
1632
1633         ret = clk_prepare_enable(dmadev->clk);
1634         if (ret < 0) {
1635                 dev_err(&pdev->dev, "clk_prep_enable error: %d\n", ret);
1636                 return ret;
1637         }
1638
1639         rst = devm_reset_control_get(&pdev->dev, NULL);
1640         if (IS_ERR(rst)) {
1641                 ret = PTR_ERR(rst);
1642                 if (ret == -EPROBE_DEFER)
1643                         goto err_clk;
1644         } else {
1645                 reset_control_assert(rst);
1646                 udelay(2);
1647                 reset_control_deassert(rst);
1648         }
1649
1650         dd = &dmadev->ddev;
1651         dma_cap_set(DMA_SLAVE, dd->cap_mask);
1652         dma_cap_set(DMA_PRIVATE, dd->cap_mask);
1653         dma_cap_set(DMA_CYCLIC, dd->cap_mask);
1654         dma_cap_set(DMA_MEMCPY, dd->cap_mask);
1655         dd->device_alloc_chan_resources = stm32_mdma_alloc_chan_resources;
1656         dd->device_free_chan_resources = stm32_mdma_free_chan_resources;
1657         dd->device_tx_status = stm32_mdma_tx_status;
1658         dd->device_issue_pending = stm32_mdma_issue_pending;
1659         dd->device_prep_slave_sg = stm32_mdma_prep_slave_sg;
1660         dd->device_prep_dma_cyclic = stm32_mdma_prep_dma_cyclic;
1661         dd->device_prep_dma_memcpy = stm32_mdma_prep_dma_memcpy;
1662         dd->device_config = stm32_mdma_slave_config;
1663         dd->device_pause = stm32_mdma_pause;
1664         dd->device_resume = stm32_mdma_resume;
1665         dd->device_terminate_all = stm32_mdma_terminate_all;
1666         dd->device_synchronize = stm32_mdma_synchronize;
1667         dd->descriptor_reuse = true;
1668
1669         dd->src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
1670                 BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
1671                 BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) |
1672                 BIT(DMA_SLAVE_BUSWIDTH_8_BYTES);
1673         dd->dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
1674                 BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
1675                 BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) |
1676                 BIT(DMA_SLAVE_BUSWIDTH_8_BYTES);
1677         dd->directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV) |
1678                 BIT(DMA_MEM_TO_MEM);
1679         dd->residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
1680         dd->max_burst = STM32_MDMA_MAX_BURST;
1681         dd->dev = &pdev->dev;
1682         INIT_LIST_HEAD(&dd->channels);
1683
1684         for (i = 0; i < dmadev->nr_channels; i++) {
1685                 chan = &dmadev->chan[i];
1686                 chan->id = i;
1687
1688                 if (stm32_mdma_read(dmadev, STM32_MDMA_CCR(i)) & STM32_MDMA_CCR_SM)
1689                         dmadev->chan_reserved |= BIT(i);
1690
1691                 chan->vchan.desc_free = stm32_mdma_desc_free;
1692                 vchan_init(&chan->vchan, dd);
1693         }
1694
1695         dmadev->irq = platform_get_irq(pdev, 0);
1696         if (dmadev->irq < 0) {
1697                 ret = dmadev->irq;
1698                 goto err_clk;
1699         }
1700
1701         ret = devm_request_irq(&pdev->dev, dmadev->irq, stm32_mdma_irq_handler,
1702                                0, dev_name(&pdev->dev), dmadev);
1703         if (ret) {
1704                 dev_err(&pdev->dev, "failed to request IRQ\n");
1705                 goto err_clk;
1706         }
1707
1708         ret = dmaenginem_async_device_register(dd);
1709         if (ret)
1710                 goto err_clk;
1711
1712         ret = of_dma_controller_register(of_node, stm32_mdma_of_xlate, dmadev);
1713         if (ret < 0) {
1714                 dev_err(&pdev->dev,
1715                         "STM32 MDMA DMA OF registration failed %d\n", ret);
1716                 goto err_clk;
1717         }
1718
1719         platform_set_drvdata(pdev, dmadev);
1720         pm_runtime_set_active(&pdev->dev);
1721         pm_runtime_enable(&pdev->dev);
1722         pm_runtime_get_noresume(&pdev->dev);
1723         pm_runtime_put(&pdev->dev);
1724
1725         dev_info(&pdev->dev, "STM32 MDMA driver registered\n");
1726
1727         return 0;
1728
1729 err_clk:
1730         clk_disable_unprepare(dmadev->clk);
1731
1732         return ret;
1733 }
1734
1735 #ifdef CONFIG_PM
1736 static int stm32_mdma_runtime_suspend(struct device *dev)
1737 {
1738         struct stm32_mdma_device *dmadev = dev_get_drvdata(dev);
1739
1740         clk_disable_unprepare(dmadev->clk);
1741
1742         return 0;
1743 }
1744
1745 static int stm32_mdma_runtime_resume(struct device *dev)
1746 {
1747         struct stm32_mdma_device *dmadev = dev_get_drvdata(dev);
1748         int ret;
1749
1750         ret = clk_prepare_enable(dmadev->clk);
1751         if (ret) {
1752                 dev_err(dev, "failed to prepare_enable clock\n");
1753                 return ret;
1754         }
1755
1756         return 0;
1757 }
1758 #endif
1759
1760 #ifdef CONFIG_PM_SLEEP
1761 static int stm32_mdma_pm_suspend(struct device *dev)
1762 {
1763         struct stm32_mdma_device *dmadev = dev_get_drvdata(dev);
1764         u32 ccr, id;
1765         int ret;
1766
1767         ret = pm_runtime_resume_and_get(dev);
1768         if (ret < 0)
1769                 return ret;
1770
1771         for (id = 0; id < dmadev->nr_channels; id++) {
1772                 ccr = stm32_mdma_read(dmadev, STM32_MDMA_CCR(id));
1773                 if (ccr & STM32_MDMA_CCR_EN) {
1774                         dev_warn(dev, "Suspend is prevented by Chan %i\n", id);
1775                         return -EBUSY;
1776                 }
1777         }
1778
1779         pm_runtime_put_sync(dev);
1780
1781         pm_runtime_force_suspend(dev);
1782
1783         return 0;
1784 }
1785
1786 static int stm32_mdma_pm_resume(struct device *dev)
1787 {
1788         return pm_runtime_force_resume(dev);
1789 }
1790 #endif
1791
1792 static const struct dev_pm_ops stm32_mdma_pm_ops = {
1793         SET_SYSTEM_SLEEP_PM_OPS(stm32_mdma_pm_suspend, stm32_mdma_pm_resume)
1794         SET_RUNTIME_PM_OPS(stm32_mdma_runtime_suspend,
1795                            stm32_mdma_runtime_resume, NULL)
1796 };
1797
1798 static struct platform_driver stm32_mdma_driver = {
1799         .probe = stm32_mdma_probe,
1800         .driver = {
1801                 .name = "stm32-mdma",
1802                 .of_match_table = stm32_mdma_of_match,
1803                 .pm = &stm32_mdma_pm_ops,
1804         },
1805 };
1806
1807 static int __init stm32_mdma_init(void)
1808 {
1809         return platform_driver_register(&stm32_mdma_driver);
1810 }
1811
1812 subsys_initcall(stm32_mdma_init);
1813
1814 MODULE_DESCRIPTION("Driver for STM32 MDMA controller");
1815 MODULE_AUTHOR("M'boumba Cedric Madianga <cedric.madianga@gmail.com>");
1816 MODULE_AUTHOR("Pierre-Yves Mordret <pierre-yves.mordret@st.com>");