sound/soc/intel/skylake/skl-sst-cldma.c

   1 /*
   2  * skl-sst-cldma.c - Code Loader DMA handler
   3  *
   4  * Copyright (C) 2015, Intel Corporation.
   5  * Author: Subhransu S. Prusty <subhransu.s.prusty@intel.com>
   6  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as version 2, as
  10  * published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  */
  17
  18 #include <linux/device.h>
  19 #include <linux/mm.h>
  20 #include <linux/kthread.h>
  21 #include <linux/delay.h>
  22 #include "../common/sst-dsp.h"
  23 #include "../common/sst-dsp-priv.h"
  24
  25 static void skl_cldma_int_enable(struct sst_dsp *ctx)
  26 {
  27         sst_dsp_shim_update_bits_unlocked(ctx, SKL_ADSP_REG_ADSPIC,
  28                                 SKL_ADSPIC_CL_DMA, SKL_ADSPIC_CL_DMA);
  29 }
  30
  31 void skl_cldma_int_disable(struct sst_dsp *ctx)
  32 {
  33         sst_dsp_shim_update_bits_unlocked(ctx,
  34                         SKL_ADSP_REG_ADSPIC, SKL_ADSPIC_CL_DMA, 0);
  35 }
  36
  37 static void skl_cldma_stream_run(struct sst_dsp  *ctx, bool enable)
  38 {
  39         unsigned char val;
  40         int timeout;
  41
  42         sst_dsp_shim_update_bits_unlocked(ctx,
  43                         SKL_ADSP_REG_CL_SD_CTL,
  44                         CL_SD_CTL_RUN_MASK, CL_SD_CTL_RUN(enable));
  45
  46         udelay(3);
  47         timeout = 300;
  48         do {
  49                 /* waiting for hardware to report that the stream Run bit set */
  50                 val = sst_dsp_shim_read(ctx, SKL_ADSP_REG_CL_SD_CTL) &
  51                         CL_SD_CTL_RUN_MASK;
  52                 if (enable && val)
  53                         break;
  54                 else if (!enable && !val)
  55                         break;
  56                 udelay(3);
  57         } while (--timeout);
  58
  59         if (timeout == 0)
  60                 dev_err(ctx->dev, "Failed to set Run bit=%d enable=%d\n", val, enable);
  61 }
  62
  63 static void skl_cldma_stream_clear(struct sst_dsp  *ctx)
  64 {
  65         /* make sure Run bit is cleared before setting stream register */
  66         skl_cldma_stream_run(ctx, 0);
  67
  68         sst_dsp_shim_update_bits(ctx, SKL_ADSP_REG_CL_SD_CTL,
  69                                 CL_SD_CTL_IOCE_MASK, CL_SD_CTL_IOCE(0));
  70         sst_dsp_shim_update_bits(ctx, SKL_ADSP_REG_CL_SD_CTL,
  71                                 CL_SD_CTL_FEIE_MASK, CL_SD_CTL_FEIE(0));
  72         sst_dsp_shim_update_bits(ctx, SKL_ADSP_REG_CL_SD_CTL,
  73                                 CL_SD_CTL_DEIE_MASK, CL_SD_CTL_DEIE(0));
  74         sst_dsp_shim_update_bits(ctx, SKL_ADSP_REG_CL_SD_CTL,
  75                                 CL_SD_CTL_STRM_MASK, CL_SD_CTL_STRM(0));
  76
  77         sst_dsp_shim_write(ctx, SKL_ADSP_REG_CL_SD_BDLPL, CL_SD_BDLPLBA(0));
  78         sst_dsp_shim_write(ctx, SKL_ADSP_REG_CL_SD_BDLPU, 0);
  79
  80         sst_dsp_shim_write(ctx, SKL_ADSP_REG_CL_SD_CBL, 0);
  81         sst_dsp_shim_write(ctx, SKL_ADSP_REG_CL_SD_LVI, 0);
  82 }
  83
  84 /* Code loader helper APIs */
  85 static void skl_cldma_setup_bdle(struct sst_dsp *ctx,
  86                 struct snd_dma_buffer *dmab_data,
  87                 u32 **bdlp, int size, int with_ioc)
  88 {
  89         u32 *bdl = *bdlp;
  90
  91         ctx->cl_dev.frags = 0;
  92         while (size > 0) {
  93                 phys_addr_t addr = virt_to_phys(dmab_data->area +
  94                                 (ctx->cl_dev.frags * ctx->cl_dev.bufsize));
  95
  96                 bdl[0] = cpu_to_le32(lower_32_bits(addr));
  97                 bdl[1] = cpu_to_le32(upper_32_bits(addr));
  98
  99                 bdl[2] = cpu_to_le32(ctx->cl_dev.bufsize);
 100
 101                 size -= ctx->cl_dev.bufsize;
 102                 bdl[3] = (size || !with_ioc) ? 0 : cpu_to_le32(0x01);
 103
 104                 bdl += 4;
 105                 ctx->cl_dev.frags++;
 106         }
 107 }
 108
 109 /*
 110  * Setup controller
 111  * Configure the registers to update the dma buffer address and
 112  * enable interrupts.
 113  * Note: Using the channel 1 for transfer
 114  */
 115 static void skl_cldma_setup_controller(struct sst_dsp  *ctx,
 116                 struct snd_dma_buffer *dmab_bdl, unsigned int max_size,
 117                 u32 count)
 118 {
 119         skl_cldma_stream_clear(ctx);
 120         sst_dsp_shim_write(ctx, SKL_ADSP_REG_CL_SD_BDLPL,
 121                         CL_SD_BDLPLBA(dmab_bdl->addr));
 122         sst_dsp_shim_write(ctx, SKL_ADSP_REG_CL_SD_BDLPU,
 123                         CL_SD_BDLPUBA(dmab_bdl->addr));
 124
 125         sst_dsp_shim_write(ctx, SKL_ADSP_REG_CL_SD_CBL, max_size);
 126         sst_dsp_shim_write(ctx, SKL_ADSP_REG_CL_SD_LVI, count - 1);
 127         sst_dsp_shim_update_bits(ctx, SKL_ADSP_REG_CL_SD_CTL,
 128                         CL_SD_CTL_IOCE_MASK, CL_SD_CTL_IOCE(1));
 129         sst_dsp_shim_update_bits(ctx, SKL_ADSP_REG_CL_SD_CTL,
 130                         CL_SD_CTL_FEIE_MASK, CL_SD_CTL_FEIE(1));
 131         sst_dsp_shim_update_bits(ctx, SKL_ADSP_REG_CL_SD_CTL,
 132                         CL_SD_CTL_DEIE_MASK, CL_SD_CTL_DEIE(1));
 133         sst_dsp_shim_update_bits(ctx, SKL_ADSP_REG_CL_SD_CTL,
 134                         CL_SD_CTL_STRM_MASK, CL_SD_CTL_STRM(FW_CL_STREAM_NUMBER));
 135 }
 136
 137 static void skl_cldma_setup_spb(struct sst_dsp  *ctx,
 138                 unsigned int size, bool enable)
 139 {
 140         if (enable)
 141                 sst_dsp_shim_update_bits_unlocked(ctx,
 142                                 SKL_ADSP_REG_CL_SPBFIFO_SPBFCCTL,
 143                                 CL_SPBFIFO_SPBFCCTL_SPIBE_MASK,
 144                                 CL_SPBFIFO_SPBFCCTL_SPIBE(1));
 145
 146         sst_dsp_shim_write_unlocked(ctx, SKL_ADSP_REG_CL_SPBFIFO_SPIB, size);
 147 }
 148
 149 static void skl_cldma_cleanup_spb(struct sst_dsp  *ctx)
 150 {
 151         sst_dsp_shim_update_bits_unlocked(ctx,
 152                         SKL_ADSP_REG_CL_SPBFIFO_SPBFCCTL,
 153                         CL_SPBFIFO_SPBFCCTL_SPIBE_MASK,
 154                         CL_SPBFIFO_SPBFCCTL_SPIBE(0));
 155
 156         sst_dsp_shim_write_unlocked(ctx, SKL_ADSP_REG_CL_SPBFIFO_SPIB, 0);
 157 }
 158
 159 static void skl_cldma_cleanup(struct sst_dsp  *ctx)
 160 {
 161         skl_cldma_cleanup_spb(ctx);
 162         skl_cldma_stream_clear(ctx);
 163
 164         ctx->dsp_ops.free_dma_buf(ctx->dev, &ctx->cl_dev.dmab_data);
 165         ctx->dsp_ops.free_dma_buf(ctx->dev, &ctx->cl_dev.dmab_bdl);
 166 }
 167
 168 static int skl_cldma_wait_interruptible(struct sst_dsp *ctx)
 169 {
 170         int ret = 0;
 171
 172         if (!wait_event_timeout(ctx->cl_dev.wait_queue,
 173                                 ctx->cl_dev.wait_condition,
 174                                 msecs_to_jiffies(SKL_WAIT_TIMEOUT))) {
 175                 dev_err(ctx->dev, "%s: Wait timeout\n", __func__);
 176                 ret = -EIO;
 177                 goto cleanup;
 178         }
 179
 180         dev_dbg(ctx->dev, "%s: Event wake\n", __func__);
 181         if (ctx->cl_dev.wake_status != SKL_CL_DMA_BUF_COMPLETE) {
 182                 dev_err(ctx->dev, "%s: DMA Error\n", __func__);
 183                 ret = -EIO;
 184         }
 185
 186 cleanup:
 187         ctx->cl_dev.wake_status = SKL_CL_DMA_STATUS_NONE;
 188         return ret;
 189 }
 190
 191 static void skl_cldma_stop(struct sst_dsp *ctx)
 192 {
 193         skl_cldma_stream_run(ctx, false);
 194 }
 195
 196 static void skl_cldma_fill_buffer(struct sst_dsp *ctx, unsigned int size,
 197                 const void *curr_pos, bool intr_enable, bool trigger)
 198 {
 199         dev_dbg(ctx->dev, "Size: %x, intr_enable: %d\n", size, intr_enable);
 200         dev_dbg(ctx->dev, "buf_pos_index:%d, trigger:%d\n",
 201                         ctx->cl_dev.dma_buffer_offset, trigger);
 202         dev_dbg(ctx->dev, "spib position: %d\n", ctx->cl_dev.curr_spib_pos);
 203
 204         /*
 205          * Check if the size exceeds buffer boundary. If it exceeds
 206          * max_buffer size, then copy till buffer size and then copy
 207          * remaining buffer from the start of ring buffer.
 208          */
 209         if (ctx->cl_dev.dma_buffer_offset + size > ctx->cl_dev.bufsize) {
 210                 unsigned int size_b = ctx->cl_dev.bufsize -
 211                                         ctx->cl_dev.dma_buffer_offset;
 212                 memcpy(ctx->cl_dev.dmab_data.area + ctx->cl_dev.dma_buffer_offset,
 213                         curr_pos, size_b);
 214                 size -= size_b;
 215                 curr_pos += size_b;
 216                 ctx->cl_dev.dma_buffer_offset = 0;
 217         }
 218
 219         memcpy(ctx->cl_dev.dmab_data.area + ctx->cl_dev.dma_buffer_offset,
 220                         curr_pos, size);
 221
 222         if (ctx->cl_dev.curr_spib_pos == ctx->cl_dev.bufsize)
 223                 ctx->cl_dev.dma_buffer_offset = 0;
 224         else
 225                 ctx->cl_dev.dma_buffer_offset = ctx->cl_dev.curr_spib_pos;
 226
 227         ctx->cl_dev.wait_condition = false;
 228
 229         if (intr_enable)
 230                 skl_cldma_int_enable(ctx);
 231
 232         ctx->cl_dev.ops.cl_setup_spb(ctx, ctx->cl_dev.curr_spib_pos, trigger);
 233         if (trigger)
 234                 ctx->cl_dev.ops.cl_trigger(ctx, true);
 235 }
 236
 237 /*
 238  * The CL dma doesn't have any way to update the transfer status until a BDL
 239  * buffer is fully transferred
 240  *
 241  * So Copying is divided in two parts.
 242  * 1. Interrupt on buffer done where the size to be transferred is more than
 243  *    ring buffer size.
 244  * 2. Polling on fw register to identify if data left to transferred doesn't
 245  *    fill the ring buffer. Caller takes care of polling the required status
 246  *    register to identify the transfer status.
 247  */
 248 static int
 249 skl_cldma_copy_to_buf(struct sst_dsp *ctx, const void *bin, u32 total_size)
 250 {
 251         int ret = 0;
 252         bool start = true;
 253         unsigned int excess_bytes;
 254         u32 size;
 255         unsigned int bytes_left = total_size;
 256         const void *curr_pos = bin;
 257
 258         if (total_size <= 0)
 259                 return -EINVAL;
 260
 261         dev_dbg(ctx->dev, "%s: Total binary size: %u\n", __func__, bytes_left);
 262
 263         while (bytes_left) {
 264                 if (bytes_left > ctx->cl_dev.bufsize) {
 265
 266                         /*
 267                          * dma transfers only till the write pointer as
 268                          * updated in spib
 269                          */
 270                         if (ctx->cl_dev.curr_spib_pos == 0)
 271                                 ctx->cl_dev.curr_spib_pos = ctx->cl_dev.bufsize;
 272
 273                         size = ctx->cl_dev.bufsize;
 274                         skl_cldma_fill_buffer(ctx, size, curr_pos, true, start);
 275
 276                         start = false;
 277                         ret = skl_cldma_wait_interruptible(ctx);
 278                         if (ret < 0) {
 279                                 skl_cldma_stop(ctx);
 280                                 return ret;
 281                         }
 282
 283                 } else {
 284                         skl_cldma_int_disable(ctx);
 285
 286                         if ((ctx->cl_dev.curr_spib_pos + bytes_left)
 287                                                         <= ctx->cl_dev.bufsize) {
 288                                 ctx->cl_dev.curr_spib_pos += bytes_left;
 289                         } else {
 290                                 excess_bytes = bytes_left -
 291                                         (ctx->cl_dev.bufsize -
 292                                         ctx->cl_dev.curr_spib_pos);
 293                                 ctx->cl_dev.curr_spib_pos = excess_bytes;
 294                         }
 295
 296                         size = bytes_left;
 297                         skl_cldma_fill_buffer(ctx, size,
 298                                         curr_pos, false, start);
 299                 }
 300                 bytes_left -= size;
 301                 curr_pos = curr_pos + size;
 302         }
 303
 304         return ret;
 305 }
 306
 307 void skl_cldma_process_intr(struct sst_dsp *ctx)
 308 {
 309         u8 cl_dma_intr_status;
 310
 311         cl_dma_intr_status =
 312                 sst_dsp_shim_read_unlocked(ctx, SKL_ADSP_REG_CL_SD_STS);
 313
 314         if (!(cl_dma_intr_status & SKL_CL_DMA_SD_INT_COMPLETE))
 315                 ctx->cl_dev.wake_status = SKL_CL_DMA_ERR;
 316         else
 317                 ctx->cl_dev.wake_status = SKL_CL_DMA_BUF_COMPLETE;
 318
 319         ctx->cl_dev.wait_condition = true;
 320         wake_up(&ctx->cl_dev.wait_queue);
 321 }
 322
 323 int skl_cldma_prepare(struct sst_dsp *ctx)
 324 {
 325         int ret;
 326         u32 *bdl;
 327
 328         ctx->cl_dev.bufsize = SKL_MAX_BUFFER_SIZE;
 329
 330         /* Allocate cl ops */
 331         ctx->cl_dev.ops.cl_setup_bdle = skl_cldma_setup_bdle;
 332         ctx->cl_dev.ops.cl_setup_controller = skl_cldma_setup_controller;
 333         ctx->cl_dev.ops.cl_setup_spb = skl_cldma_setup_spb;
 334         ctx->cl_dev.ops.cl_cleanup_spb = skl_cldma_cleanup_spb;
 335         ctx->cl_dev.ops.cl_trigger = skl_cldma_stream_run;
 336         ctx->cl_dev.ops.cl_cleanup_controller = skl_cldma_cleanup;
 337         ctx->cl_dev.ops.cl_copy_to_dmabuf = skl_cldma_copy_to_buf;
 338         ctx->cl_dev.ops.cl_stop_dma = skl_cldma_stop;
 339
 340         /* Allocate buffer*/
 341         ret = ctx->dsp_ops.alloc_dma_buf(ctx->dev,
 342                         &ctx->cl_dev.dmab_data, ctx->cl_dev.bufsize);
 343         if (ret < 0) {
 344                 dev_err(ctx->dev, "Alloc buffer for base fw failed: %x", ret);
 345                 return ret;
 346         }
 347         /* Setup Code loader BDL */
 348         ret = ctx->dsp_ops.alloc_dma_buf(ctx->dev,
 349                         &ctx->cl_dev.dmab_bdl, PAGE_SIZE);
 350         if (ret < 0) {
 351                 dev_err(ctx->dev, "Alloc buffer for blde failed: %x", ret);
 352                 ctx->dsp_ops.free_dma_buf(ctx->dev, &ctx->cl_dev.dmab_data);
 353                 return ret;
 354         }
 355         bdl = (u32 *)ctx->cl_dev.dmab_bdl.area;
 356
 357         /* Allocate BDLs */
 358         ctx->cl_dev.ops.cl_setup_bdle(ctx, &ctx->cl_dev.dmab_data,
 359                         &bdl, ctx->cl_dev.bufsize, 1);
 360         ctx->cl_dev.ops.cl_setup_controller(ctx, &ctx->cl_dev.dmab_bdl,
 361                         ctx->cl_dev.bufsize, ctx->cl_dev.frags);
 362
 363         ctx->cl_dev.curr_spib_pos = 0;
 364         ctx->cl_dev.dma_buffer_offset = 0;
 365         init_waitqueue_head(&ctx->cl_dev.wait_queue);
 366
 367         return ret;
 368 }