linux/drivers/staging/media/meson/vdec/esparser.c
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   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * Copyright (C) 2018 BayLibre, SAS
   4 * Author: Maxime Jourdan <mjourdan@baylibre.com>
   5 *
   6 * The Elementary Stream Parser is a HW bitstream parser.
   7 * It reads bitstream buffers and feeds them to the VIFIFO
   8 */
   9
  10#include <linux/init.h>
  11#include <linux/ioctl.h>
  12#include <linux/list.h>
  13#include <linux/module.h>
  14#include <linux/of_device.h>
  15#include <linux/reset.h>
  16#include <linux/interrupt.h>
  17#include <media/videobuf2-dma-contig.h>
  18#include <media/v4l2-mem2mem.h>
  19
  20#include "dos_regs.h"
  21#include "esparser.h"
  22#include "vdec_helpers.h"
  23
  24/* PARSER REGS (CBUS) */
  25#define PARSER_CONTROL 0x00
  26        #define ES_PACK_SIZE_BIT        8
  27        #define ES_WRITE                BIT(5)
  28        #define ES_SEARCH               BIT(1)
  29        #define ES_PARSER_START         BIT(0)
  30#define PARSER_FETCH_ADDR       0x4
  31#define PARSER_FETCH_CMD        0x8
  32#define PARSER_CONFIG 0x14
  33        #define PS_CFG_MAX_FETCH_CYCLE_BIT      0
  34        #define PS_CFG_STARTCODE_WID_24_BIT     10
  35        #define PS_CFG_MAX_ES_WR_CYCLE_BIT      12
  36        #define PS_CFG_PFIFO_EMPTY_CNT_BIT      16
  37#define PFIFO_WR_PTR 0x18
  38#define PFIFO_RD_PTR 0x1c
  39#define PARSER_SEARCH_PATTERN 0x24
  40        #define ES_START_CODE_PATTERN 0x00000100
  41#define PARSER_SEARCH_MASK 0x28
  42        #define ES_START_CODE_MASK      0xffffff00
  43        #define FETCH_ENDIAN_BIT        27
  44#define PARSER_INT_ENABLE       0x2c
  45        #define PARSER_INT_HOST_EN_BIT  8
  46#define PARSER_INT_STATUS       0x30
  47        #define PARSER_INTSTAT_SC_FOUND 1
  48#define PARSER_ES_CONTROL       0x5c
  49#define PARSER_VIDEO_START_PTR  0x80
  50#define PARSER_VIDEO_END_PTR    0x84
  51#define PARSER_VIDEO_WP         0x88
  52#define PARSER_VIDEO_HOLE       0x90
  53
  54#define SEARCH_PATTERN_LEN      512
  55
  56static DECLARE_WAIT_QUEUE_HEAD(wq);
  57static int search_done;
  58
  59static irqreturn_t esparser_isr(int irq, void *dev)
  60{
  61        int int_status;
  62        struct amvdec_core *core = dev;
  63
  64        int_status = amvdec_read_parser(core, PARSER_INT_STATUS);
  65        amvdec_write_parser(core, PARSER_INT_STATUS, int_status);
  66
  67        if (int_status & PARSER_INTSTAT_SC_FOUND) {
  68                amvdec_write_parser(core, PFIFO_RD_PTR, 0);
  69                amvdec_write_parser(core, PFIFO_WR_PTR, 0);
  70                search_done = 1;
  71                wake_up_interruptible(&wq);
  72        }
  73
  74        return IRQ_HANDLED;
  75}
  76
  77/* Pad the packet to at least 4KiB bytes otherwise the VDEC unit won't trigger
  78 * ISRs.
  79 * Also append a start code 000001ff at the end to trigger
  80 * the ESPARSER interrupt.
  81 */
  82static u32 esparser_pad_start_code(struct vb2_buffer *vb)
  83{
  84        u32 payload_size = vb2_get_plane_payload(vb, 0);
  85        u32 pad_size = 0;
  86        u8 *vaddr = vb2_plane_vaddr(vb, 0) + payload_size;
  87
  88        if (payload_size < ESPARSER_MIN_PACKET_SIZE) {
  89                pad_size = ESPARSER_MIN_PACKET_SIZE - payload_size;
  90                memset(vaddr, 0, pad_size);
  91        }
  92
  93        memset(vaddr + pad_size, 0, SEARCH_PATTERN_LEN);
  94        vaddr[pad_size]     = 0x00;
  95        vaddr[pad_size + 1] = 0x00;
  96        vaddr[pad_size + 2] = 0x01;
  97        vaddr[pad_size + 3] = 0xff;
  98
  99        return pad_size;
 100}
 101
 102static int
 103esparser_write_data(struct amvdec_core *core, dma_addr_t addr, u32 size)
 104{
 105        amvdec_write_parser(core, PFIFO_RD_PTR, 0);
 106        amvdec_write_parser(core, PFIFO_WR_PTR, 0);
 107        amvdec_write_parser(core, PARSER_CONTROL,
 108                            ES_WRITE |
 109                            ES_PARSER_START |
 110                            ES_SEARCH |
 111                            (size << ES_PACK_SIZE_BIT));
 112
 113        amvdec_write_parser(core, PARSER_FETCH_ADDR, addr);
 114        amvdec_write_parser(core, PARSER_FETCH_CMD,
 115                            (7 << FETCH_ENDIAN_BIT) |
 116                            (size + SEARCH_PATTERN_LEN));
 117
 118        search_done = 0;
 119        return wait_event_interruptible_timeout(wq, search_done, (HZ / 5));
 120}
 121
 122static u32 esparser_vififo_get_free_space(struct amvdec_session *sess)
 123{
 124        u32 vififo_usage;
 125        struct amvdec_ops *vdec_ops = sess->fmt_out->vdec_ops;
 126        struct amvdec_core *core = sess->core;
 127
 128        vififo_usage  = vdec_ops->vififo_level(sess);
 129        vififo_usage += amvdec_read_parser(core, PARSER_VIDEO_HOLE);
 130        vififo_usage += (6 * SZ_1K); // 6 KiB internal fifo
 131
 132        if (vififo_usage > sess->vififo_size) {
 133                dev_warn(sess->core->dev,
 134                         "VIFIFO usage (%u) > VIFIFO size (%u)\n",
 135                         vififo_usage, sess->vififo_size);
 136                return 0;
 137        }
 138
 139        return sess->vififo_size - vififo_usage;
 140}
 141
 142int esparser_queue_eos(struct amvdec_core *core, const u8 *data, u32 len)
 143{
 144        struct device *dev = core->dev;
 145        void *eos_vaddr;
 146        dma_addr_t eos_paddr;
 147        int ret;
 148
 149        eos_vaddr = dma_alloc_coherent(dev, len + SEARCH_PATTERN_LEN,
 150                                       &eos_paddr, GFP_KERNEL);
 151        if (!eos_vaddr)
 152                return -ENOMEM;
 153
 154        memcpy(eos_vaddr, data, len);
 155        ret = esparser_write_data(core, eos_paddr, len);
 156        dma_free_coherent(dev, len + SEARCH_PATTERN_LEN,
 157                          eos_vaddr, eos_paddr);
 158
 159        return ret;
 160}
 161
 162static u32 esparser_get_offset(struct amvdec_session *sess)
 163{
 164        struct amvdec_core *core = sess->core;
 165        u32 offset = amvdec_read_parser(core, PARSER_VIDEO_WP) -
 166                     sess->vififo_paddr;
 167
 168        if (offset < sess->last_offset)
 169                sess->wrap_count++;
 170
 171        sess->last_offset = offset;
 172        offset += (sess->wrap_count * sess->vififo_size);
 173
 174        return offset;
 175}
 176
 177static int
 178esparser_queue(struct amvdec_session *sess, struct vb2_v4l2_buffer *vbuf)
 179{
 180        int ret;
 181        struct vb2_buffer *vb = &vbuf->vb2_buf;
 182        struct amvdec_core *core = sess->core;
 183        struct amvdec_codec_ops *codec_ops = sess->fmt_out->codec_ops;
 184        u32 num_dst_bufs = 0;
 185        u32 payload_size = vb2_get_plane_payload(vb, 0);
 186        dma_addr_t phy = vb2_dma_contig_plane_dma_addr(vb, 0);
 187        u32 offset;
 188        u32 pad_size;
 189
 190        if (codec_ops->num_pending_bufs)
 191                num_dst_bufs = codec_ops->num_pending_bufs(sess);
 192
 193        num_dst_bufs += v4l2_m2m_num_dst_bufs_ready(sess->m2m_ctx);
 194
 195        if (esparser_vififo_get_free_space(sess) < payload_size ||
 196            atomic_read(&sess->esparser_queued_bufs) >= num_dst_bufs)
 197                return -EAGAIN;
 198
 199        v4l2_m2m_src_buf_remove_by_buf(sess->m2m_ctx, vbuf);
 200
 201        offset = esparser_get_offset(sess);
 202
 203        amvdec_add_ts_reorder(sess, vb->timestamp, offset);
 204        dev_dbg(core->dev, "esparser: ts = %llu pld_size = %u offset = %08X\n",
 205                vb->timestamp, payload_size, offset);
 206
 207        pad_size = esparser_pad_start_code(vb);
 208        ret = esparser_write_data(core, phy, payload_size + pad_size);
 209
 210        if (ret <= 0) {
 211                dev_warn(core->dev, "esparser: input parsing error\n");
 212                amvdec_remove_ts(sess, vb->timestamp);
 213                v4l2_m2m_buf_done(vbuf, VB2_BUF_STATE_ERROR);
 214                amvdec_write_parser(core, PARSER_FETCH_CMD, 0);
 215
 216                return 0;
 217        }
 218
 219        /* We need to wait until we parse the first keyframe.
 220         * All buffers prior to the first keyframe must be dropped.
 221         */
 222        if (!sess->keyframe_found)
 223                usleep_range(1000, 2000);
 224
 225        if (sess->keyframe_found)
 226                atomic_inc(&sess->esparser_queued_bufs);
 227        else
 228                amvdec_remove_ts(sess, vb->timestamp);
 229
 230        vbuf->flags = 0;
 231        vbuf->field = V4L2_FIELD_NONE;
 232        v4l2_m2m_buf_done(vbuf, VB2_BUF_STATE_DONE);
 233
 234        return 0;
 235}
 236
 237void esparser_queue_all_src(struct work_struct *work)
 238{
 239        struct v4l2_m2m_buffer *buf, *n;
 240        struct amvdec_session *sess =
 241                container_of(work, struct amvdec_session, esparser_queue_work);
 242
 243        mutex_lock(&sess->lock);
 244        v4l2_m2m_for_each_src_buf_safe(sess->m2m_ctx, buf, n) {
 245                if (sess->should_stop)
 246                        break;
 247
 248                if (esparser_queue(sess, &buf->vb) < 0)
 249                        break;
 250        }
 251        mutex_unlock(&sess->lock);
 252}
 253
 254int esparser_power_up(struct amvdec_session *sess)
 255{
 256        struct amvdec_core *core = sess->core;
 257        struct amvdec_ops *vdec_ops = sess->fmt_out->vdec_ops;
 258
 259        reset_control_reset(core->esparser_reset);
 260        amvdec_write_parser(core, PARSER_CONFIG,
 261                            (10 << PS_CFG_PFIFO_EMPTY_CNT_BIT) |
 262                            (1  << PS_CFG_MAX_ES_WR_CYCLE_BIT) |
 263                            (16 << PS_CFG_MAX_FETCH_CYCLE_BIT));
 264
 265        amvdec_write_parser(core, PFIFO_RD_PTR, 0);
 266        amvdec_write_parser(core, PFIFO_WR_PTR, 0);
 267
 268        amvdec_write_parser(core, PARSER_SEARCH_PATTERN,
 269                            ES_START_CODE_PATTERN);
 270        amvdec_write_parser(core, PARSER_SEARCH_MASK, ES_START_CODE_MASK);
 271
 272        amvdec_write_parser(core, PARSER_CONFIG,
 273                            (10 << PS_CFG_PFIFO_EMPTY_CNT_BIT) |
 274                            (1  << PS_CFG_MAX_ES_WR_CYCLE_BIT) |
 275                            (16 << PS_CFG_MAX_FETCH_CYCLE_BIT) |
 276                            (2  << PS_CFG_STARTCODE_WID_24_BIT));
 277
 278        amvdec_write_parser(core, PARSER_CONTROL,
 279                            (ES_SEARCH | ES_PARSER_START));
 280
 281        amvdec_write_parser(core, PARSER_VIDEO_START_PTR, sess->vififo_paddr);
 282        amvdec_write_parser(core, PARSER_VIDEO_END_PTR,
 283                            sess->vififo_paddr + sess->vififo_size - 8);
 284        amvdec_write_parser(core, PARSER_ES_CONTROL,
 285                            amvdec_read_parser(core, PARSER_ES_CONTROL) & ~1);
 286
 287        if (vdec_ops->conf_esparser)
 288                vdec_ops->conf_esparser(sess);
 289
 290        amvdec_write_parser(core, PARSER_INT_STATUS, 0xffff);
 291        amvdec_write_parser(core, PARSER_INT_ENABLE,
 292                            BIT(PARSER_INT_HOST_EN_BIT));
 293
 294        return 0;
 295}
 296
 297int esparser_init(struct platform_device *pdev, struct amvdec_core *core)
 298{
 299        struct device *dev = &pdev->dev;
 300        int ret;
 301        int irq;
 302
 303        irq = platform_get_irq_byname(pdev, "esparser");
 304        if (irq < 0)
 305                return irq;
 306
 307        ret = devm_request_irq(dev, irq, esparser_isr, IRQF_SHARED,
 308                               "esparserirq", core);
 309        if (ret) {
 310                dev_err(dev, "Failed requesting ESPARSER IRQ\n");
 311                return ret;
 312        }
 313
 314        core->esparser_reset =
 315                devm_reset_control_get_exclusive(dev, "esparser");
 316        if (IS_ERR(core->esparser_reset)) {
 317                dev_err(dev, "Failed to get esparser_reset\n");
 318                return PTR_ERR(core->esparser_reset);
 319        }
 320
 321        return 0;
 322}
 323