drivers/media/platform/coda/imx-vdoa.c

   1 /*
   2  * i.MX6 Video Data Order Adapter (VDOA)
   3  *
   4  * Copyright (C) 2014 Philipp Zabel
   5  * Copyright (C) 2016 Pengutronix, Michael Tretter <kernel@pengutronix.de>
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License
   9  * version 2, as published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  */
  16
  17 #include <linux/clk.h>
  18 #include <linux/device.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/module.h>
  21 #include <linux/dma-mapping.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/videodev2.h>
  24 #include <linux/slab.h>
  25
  26 #include "imx-vdoa.h"
  27
  28 #define VDOA_NAME "imx-vdoa"
  29
  30 #define VDOAC           0x00
  31 #define VDOASRR         0x04
  32 #define VDOAIE          0x08
  33 #define VDOAIST         0x0c
  34 #define VDOAFP          0x10
  35 #define VDOAIEBA00      0x14
  36 #define VDOAIEBA01      0x18
  37 #define VDOAIEBA02      0x1c
  38 #define VDOAIEBA10      0x20
  39 #define VDOAIEBA11      0x24
  40 #define VDOAIEBA12      0x28
  41 #define VDOASL          0x2c
  42 #define VDOAIUBO        0x30
  43 #define VDOAVEBA0       0x34
  44 #define VDOAVEBA1       0x38
  45 #define VDOAVEBA2       0x3c
  46 #define VDOAVUBO        0x40
  47 #define VDOASR          0x44
  48
  49 #define VDOAC_ISEL              BIT(6)
  50 #define VDOAC_PFS               BIT(5)
  51 #define VDOAC_SO                BIT(4)
  52 #define VDOAC_SYNC              BIT(3)
  53 #define VDOAC_NF                BIT(2)
  54 #define VDOAC_BNDM_MASK         0x3
  55 #define VDOAC_BAND_HEIGHT_8     0x0
  56 #define VDOAC_BAND_HEIGHT_16    0x1
  57 #define VDOAC_BAND_HEIGHT_32    0x2
  58
  59 #define VDOASRR_START           BIT(1)
  60 #define VDOASRR_SWRST           BIT(0)
  61
  62 #define VDOAIE_EITERR           BIT(1)
  63 #define VDOAIE_EIEOT            BIT(0)
  64
  65 #define VDOAIST_TERR            BIT(1)
  66 #define VDOAIST_EOT             BIT(0)
  67
  68 #define VDOAFP_FH_MASK          (0x1fff << 16)
  69 #define VDOAFP_FW_MASK          (0x3fff)
  70
  71 #define VDOASL_VSLY_MASK        (0x3fff << 16)
  72 #define VDOASL_ISLY_MASK        (0x7fff)
  73
  74 #define VDOASR_ERRW             BIT(4)
  75 #define VDOASR_EOB              BIT(3)
  76 #define VDOASR_CURRENT_FRAME    (0x3 << 1)
  77 #define VDOASR_CURRENT_BUFFER   BIT(1)
  78
  79 enum {
  80         V4L2_M2M_SRC = 0,
  81         V4L2_M2M_DST = 1,
  82 };
  83
  84 struct vdoa_data {
  85         struct vdoa_ctx         *curr_ctx;
  86         struct device           *dev;
  87         struct clk              *vdoa_clk;
  88         void __iomem            *regs;
  89         int                     irq;
  90 };
  91
  92 struct vdoa_q_data {
  93         unsigned int    width;
  94         unsigned int    height;
  95         unsigned int    bytesperline;
  96         unsigned int    sizeimage;
  97         u32             pixelformat;
  98 };
  99
 100 struct vdoa_ctx {
 101         struct vdoa_data        *vdoa;
 102         struct completion       completion;
 103         struct vdoa_q_data      q_data[2];
 104 };
 105
 106 static irqreturn_t vdoa_irq_handler(int irq, void *data)
 107 {
 108         struct vdoa_data *vdoa = data;
 109         struct vdoa_ctx *curr_ctx;
 110         u32 val;
 111
 112         /* Disable interrupts */
 113         writel(0, vdoa->regs + VDOAIE);
 114
 115         curr_ctx = vdoa->curr_ctx;
 116         if (!curr_ctx) {
 117                 dev_dbg(vdoa->dev,
 118                         "Instance released before the end of transaction\n");
 119                 return IRQ_HANDLED;
 120         }
 121
 122         val = readl(vdoa->regs + VDOAIST);
 123         writel(val, vdoa->regs + VDOAIST);
 124         if (val & VDOAIST_TERR) {
 125                 val = readl(vdoa->regs + VDOASR) & VDOASR_ERRW;
 126                 dev_err(vdoa->dev, "AXI %s error\n", val ? "write" : "read");
 127         } else if (!(val & VDOAIST_EOT)) {
 128                 dev_warn(vdoa->dev, "Spurious interrupt\n");
 129         }
 130         complete(&curr_ctx->completion);
 131
 132         return IRQ_HANDLED;
 133 }
 134
 135 void vdoa_device_run(struct vdoa_ctx *ctx, dma_addr_t dst, dma_addr_t src)
 136 {
 137         struct vdoa_q_data *src_q_data, *dst_q_data;
 138         struct vdoa_data *vdoa = ctx->vdoa;
 139         u32 val;
 140
 141         vdoa->curr_ctx = ctx;
 142
 143         src_q_data = &ctx->q_data[V4L2_M2M_SRC];
 144         dst_q_data = &ctx->q_data[V4L2_M2M_DST];
 145
 146         /* Progressive, no sync, 1 frame per run */
 147         if (dst_q_data->pixelformat == V4L2_PIX_FMT_YUYV)
 148                 val = VDOAC_PFS;
 149         else
 150                 val = 0;
 151         writel(val, vdoa->regs + VDOAC);
 152
 153         writel(dst_q_data->height << 16 | dst_q_data->width,
 154                vdoa->regs + VDOAFP);
 155
 156         val = dst;
 157         writel(val, vdoa->regs + VDOAIEBA00);
 158
 159         writel(src_q_data->bytesperline << 16 | dst_q_data->bytesperline,
 160                vdoa->regs + VDOASL);
 161
 162         if (dst_q_data->pixelformat == V4L2_PIX_FMT_NV12 ||
 163             dst_q_data->pixelformat == V4L2_PIX_FMT_NV21)
 164                 val = dst_q_data->bytesperline * dst_q_data->height;
 165         else
 166                 val = 0;
 167         writel(val, vdoa->regs + VDOAIUBO);
 168
 169         val = src;
 170         writel(val, vdoa->regs + VDOAVEBA0);
 171         val = round_up(src_q_data->bytesperline * src_q_data->height, 4096);
 172         writel(val, vdoa->regs + VDOAVUBO);
 173
 174         /* Enable interrupts and start transfer */
 175         writel(VDOAIE_EITERR | VDOAIE_EIEOT, vdoa->regs + VDOAIE);
 176         writel(VDOASRR_START, vdoa->regs + VDOASRR);
 177 }
 178 EXPORT_SYMBOL(vdoa_device_run);
 179
 180 int vdoa_wait_for_completion(struct vdoa_ctx *ctx)
 181 {
 182         struct vdoa_data *vdoa = ctx->vdoa;
 183
 184         if (!wait_for_completion_timeout(&ctx->completion,
 185                                          msecs_to_jiffies(300))) {
 186                 dev_err(vdoa->dev,
 187                         "Timeout waiting for transfer result\n");
 188                 return -ETIMEDOUT;
 189         }
 190
 191         return 0;
 192 }
 193 EXPORT_SYMBOL(vdoa_wait_for_completion);
 194
 195 struct vdoa_ctx *vdoa_context_create(struct vdoa_data *vdoa)
 196 {
 197         struct vdoa_ctx *ctx;
 198         int err;
 199
 200         ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
 201         if (!ctx)
 202                 return NULL;
 203
 204         err = clk_prepare_enable(vdoa->vdoa_clk);
 205         if (err) {
 206                 kfree(ctx);
 207                 return NULL;
 208         }
 209
 210         init_completion(&ctx->completion);
 211         ctx->vdoa = vdoa;
 212
 213         return ctx;
 214 }
 215 EXPORT_SYMBOL(vdoa_context_create);
 216
 217 void vdoa_context_destroy(struct vdoa_ctx *ctx)
 218 {
 219         struct vdoa_data *vdoa = ctx->vdoa;
 220
 221         clk_disable_unprepare(vdoa->vdoa_clk);
 222         kfree(ctx);
 223 }
 224 EXPORT_SYMBOL(vdoa_context_destroy);
 225
 226 int vdoa_context_configure(struct vdoa_ctx *ctx,
 227                            unsigned int width, unsigned int height,
 228                            u32 pixelformat)
 229 {
 230         struct vdoa_q_data *src_q_data;
 231         struct vdoa_q_data *dst_q_data;
 232
 233         if (width < 16 || width  > 8192 || width % 16 != 0 ||
 234             height < 16 || height > 4096 || height % 16 != 0)
 235                 return -EINVAL;
 236
 237         if (pixelformat != V4L2_PIX_FMT_YUYV &&
 238             pixelformat != V4L2_PIX_FMT_NV12)
 239                 return -EINVAL;
 240
 241         /* If no context is passed, only check if the format is valid */
 242         if (!ctx)
 243                 return 0;
 244
 245         src_q_data = &ctx->q_data[V4L2_M2M_SRC];
 246         dst_q_data = &ctx->q_data[V4L2_M2M_DST];
 247
 248         src_q_data->width = width;
 249         src_q_data->height = height;
 250         src_q_data->bytesperline = width;
 251         src_q_data->sizeimage =
 252                 round_up(src_q_data->bytesperline * height, 4096) +
 253                 src_q_data->bytesperline * height / 2;
 254
 255         dst_q_data->width = width;
 256         dst_q_data->height = height;
 257         dst_q_data->pixelformat = pixelformat;
 258         switch (pixelformat) {
 259         case V4L2_PIX_FMT_YUYV:
 260                 dst_q_data->bytesperline = width * 2;
 261                 dst_q_data->sizeimage = dst_q_data->bytesperline * height;
 262                 break;
 263         case V4L2_PIX_FMT_NV12:
 264         default:
 265                 dst_q_data->bytesperline = width;
 266                 dst_q_data->sizeimage =
 267                         dst_q_data->bytesperline * height * 3 / 2;
 268                 break;
 269         }
 270
 271         return 0;
 272 }
 273 EXPORT_SYMBOL(vdoa_context_configure);
 274
 275 static int vdoa_probe(struct platform_device *pdev)
 276 {
 277         struct vdoa_data *vdoa;
 278         struct resource *res;
 279
 280         dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
 281
 282         vdoa = devm_kzalloc(&pdev->dev, sizeof(*vdoa), GFP_KERNEL);
 283         if (!vdoa)
 284                 return -ENOMEM;
 285
 286         vdoa->dev = &pdev->dev;
 287
 288         vdoa->vdoa_clk = devm_clk_get(vdoa->dev, NULL);
 289         if (IS_ERR(vdoa->vdoa_clk)) {
 290                 dev_err(vdoa->dev, "Failed to get clock\n");
 291                 return PTR_ERR(vdoa->vdoa_clk);
 292         }
 293
 294         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 295         vdoa->regs = devm_ioremap_resource(vdoa->dev, res);
 296         if (IS_ERR(vdoa->regs))
 297                 return PTR_ERR(vdoa->regs);
 298
 299         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 300         vdoa->irq = devm_request_threaded_irq(&pdev->dev, res->start, NULL,
 301                                         vdoa_irq_handler, IRQF_ONESHOT,
 302                                         "vdoa", vdoa);
 303         if (vdoa->irq < 0) {
 304                 dev_err(vdoa->dev, "Failed to get irq\n");
 305                 return vdoa->irq;
 306         }
 307
 308         platform_set_drvdata(pdev, vdoa);
 309
 310         return 0;
 311 }
 312
 313 static int vdoa_remove(struct platform_device *pdev)
 314 {
 315         return 0;
 316 }
 317
 318 static const struct of_device_id vdoa_dt_ids[] = {
 319         { .compatible = "fsl,imx6q-vdoa" },
 320         {}
 321 };
 322 MODULE_DEVICE_TABLE(of, vdoa_dt_ids);
 323
 324 static const struct platform_driver vdoa_driver = {
 325         .probe          = vdoa_probe,
 326         .remove         = vdoa_remove,
 327         .driver         = {
 328                 .name   = VDOA_NAME,
 329                 .of_match_table = vdoa_dt_ids,
 330         },
 331 };
 332
 333 module_platform_driver(vdoa_driver);
 334
 335 MODULE_DESCRIPTION("Video Data Order Adapter");
 336 MODULE_AUTHOR("Philipp Zabel <philipp.zabel@gmail.com>");
 337 MODULE_ALIAS("platform:imx-vdoa");
 338 MODULE_LICENSE("GPL");