drivers/gpu/ipu-v3/ipu-pre.c

   1 /*
   2  * Copyright (c) 2017 Lucas Stach, Pengutronix
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms and conditions of the GNU General Public License,
   6  * version 2, as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  */
  13
  14 #include <drm/drm_fourcc.h>
  15 #include <linux/clk.h>
  16 #include <linux/err.h>
  17 #include <linux/genalloc.h>
  18 #include <linux/module.h>
  19 #include <linux/of.h>
  20 #include <linux/platform_device.h>
  21 #include <video/imx-ipu-v3.h>
  22
  23 #include "ipu-prv.h"
  24
  25 #define IPU_PRE_MAX_WIDTH       2048
  26 #define IPU_PRE_NUM_SCANLINES   8
  27
  28 #define IPU_PRE_CTRL                                    0x000
  29 #define IPU_PRE_CTRL_SET                                0x004
  30 #define  IPU_PRE_CTRL_ENABLE                            (1 << 0)
  31 #define  IPU_PRE_CTRL_BLOCK_EN                          (1 << 1)
  32 #define  IPU_PRE_CTRL_BLOCK_16                          (1 << 2)
  33 #define  IPU_PRE_CTRL_SDW_UPDATE                        (1 << 4)
  34 #define  IPU_PRE_CTRL_VFLIP                             (1 << 5)
  35 #define  IPU_PRE_CTRL_SO                                (1 << 6)
  36 #define  IPU_PRE_CTRL_INTERLACED_FIELD                  (1 << 7)
  37 #define  IPU_PRE_CTRL_HANDSHAKE_EN                      (1 << 8)
  38 #define  IPU_PRE_CTRL_HANDSHAKE_LINE_NUM(v)             ((v & 0x3) << 9)
  39 #define  IPU_PRE_CTRL_HANDSHAKE_ABORT_SKIP_EN           (1 << 11)
  40 #define  IPU_PRE_CTRL_EN_REPEAT                         (1 << 28)
  41 #define  IPU_PRE_CTRL_TPR_REST_SEL                      (1 << 29)
  42 #define  IPU_PRE_CTRL_CLKGATE                           (1 << 30)
  43 #define  IPU_PRE_CTRL_SFTRST                            (1 << 31)
  44
  45 #define IPU_PRE_CUR_BUF                                 0x030
  46
  47 #define IPU_PRE_NEXT_BUF                                0x040
  48
  49 #define IPU_PRE_TPR_CTRL                                0x070
  50 #define  IPU_PRE_TPR_CTRL_TILE_FORMAT(v)                ((v & 0xff) << 0)
  51 #define  IPU_PRE_TPR_CTRL_TILE_FORMAT_MASK              0xff
  52 #define  IPU_PRE_TPR_CTRL_TILE_FORMAT_16_BIT            (1 << 0)
  53 #define  IPU_PRE_TPR_CTRL_TILE_FORMAT_SPLIT_BUF         (1 << 4)
  54 #define  IPU_PRE_TPR_CTRL_TILE_FORMAT_SINGLE_BUF        (1 << 5)
  55 #define  IPU_PRE_TPR_CTRL_TILE_FORMAT_SUPER_TILED       (1 << 6)
  56
  57 #define IPU_PRE_PREFETCH_ENG_CTRL                       0x080
  58 #define  IPU_PRE_PREF_ENG_CTRL_PREFETCH_EN              (1 << 0)
  59 #define  IPU_PRE_PREF_ENG_CTRL_RD_NUM_BYTES(v)          ((v & 0x7) << 1)
  60 #define  IPU_PRE_PREF_ENG_CTRL_INPUT_ACTIVE_BPP(v)      ((v & 0x3) << 4)
  61 #define  IPU_PRE_PREF_ENG_CTRL_INPUT_PIXEL_FORMAT(v)    ((v & 0x7) << 8)
  62 #define  IPU_PRE_PREF_ENG_CTRL_SHIFT_BYPASS             (1 << 11)
  63 #define  IPU_PRE_PREF_ENG_CTRL_FIELD_INVERSE            (1 << 12)
  64 #define  IPU_PRE_PREF_ENG_CTRL_PARTIAL_UV_SWAP          (1 << 14)
  65 #define  IPU_PRE_PREF_ENG_CTRL_TPR_COOR_OFFSET_EN       (1 << 15)
  66
  67 #define IPU_PRE_PREFETCH_ENG_INPUT_SIZE                 0x0a0
  68 #define  IPU_PRE_PREFETCH_ENG_INPUT_SIZE_WIDTH(v)       ((v & 0xffff) << 0)
  69 #define  IPU_PRE_PREFETCH_ENG_INPUT_SIZE_HEIGHT(v)      ((v & 0xffff) << 16)
  70
  71 #define IPU_PRE_PREFETCH_ENG_PITCH                      0x0d0
  72 #define  IPU_PRE_PREFETCH_ENG_PITCH_Y(v)                ((v & 0xffff) << 0)
  73 #define  IPU_PRE_PREFETCH_ENG_PITCH_UV(v)               ((v & 0xffff) << 16)
  74
  75 #define IPU_PRE_STORE_ENG_CTRL                          0x110
  76 #define  IPU_PRE_STORE_ENG_CTRL_STORE_EN                (1 << 0)
  77 #define  IPU_PRE_STORE_ENG_CTRL_WR_NUM_BYTES(v)         ((v & 0x7) << 1)
  78 #define  IPU_PRE_STORE_ENG_CTRL_OUTPUT_ACTIVE_BPP(v)    ((v & 0x3) << 4)
  79
  80 #define IPU_PRE_STORE_ENG_STATUS                        0x120
  81 #define  IPU_PRE_STORE_ENG_STATUS_STORE_BLOCK_X_MASK    0xffff
  82 #define  IPU_PRE_STORE_ENG_STATUS_STORE_BLOCK_X_SHIFT   0
  83 #define  IPU_PRE_STORE_ENG_STATUS_STORE_BLOCK_Y_MASK    0x3fff
  84 #define  IPU_PRE_STORE_ENG_STATUS_STORE_BLOCK_Y_SHIFT   16
  85 #define  IPU_PRE_STORE_ENG_STATUS_STORE_FIFO_FULL       (1 << 30)
  86 #define  IPU_PRE_STORE_ENG_STATUS_STORE_FIELD           (1 << 31)
  87
  88 #define IPU_PRE_STORE_ENG_SIZE                          0x130
  89 #define  IPU_PRE_STORE_ENG_SIZE_INPUT_WIDTH(v)          ((v & 0xffff) << 0)
  90 #define  IPU_PRE_STORE_ENG_SIZE_INPUT_HEIGHT(v)         ((v & 0xffff) << 16)
  91
  92 #define IPU_PRE_STORE_ENG_PITCH                         0x140
  93 #define  IPU_PRE_STORE_ENG_PITCH_OUT_PITCH(v)           ((v & 0xffff) << 0)
  94
  95 #define IPU_PRE_STORE_ENG_ADDR                          0x150
  96
  97 struct ipu_pre {
  98         struct list_head        list;
  99         struct device           *dev;
 100
 101         void __iomem            *regs;
 102         struct clk              *clk_axi;
 103         struct gen_pool         *iram;
 104
 105         dma_addr_t              buffer_paddr;
 106         void                    *buffer_virt;
 107         bool                    in_use;
 108         unsigned int            safe_window_end;
 109 };
 110
 111 static DEFINE_MUTEX(ipu_pre_list_mutex);
 112 static LIST_HEAD(ipu_pre_list);
 113 static int available_pres;
 114
 115 int ipu_pre_get_available_count(void)
 116 {
 117         return available_pres;
 118 }
 119
 120 struct ipu_pre *
 121 ipu_pre_lookup_by_phandle(struct device *dev, const char *name, int index)
 122 {
 123         struct device_node *pre_node = of_parse_phandle(dev->of_node,
 124                                                         name, index);
 125         struct ipu_pre *pre;
 126
 127         mutex_lock(&ipu_pre_list_mutex);
 128         list_for_each_entry(pre, &ipu_pre_list, list) {
 129                 if (pre_node == pre->dev->of_node) {
 130                         mutex_unlock(&ipu_pre_list_mutex);
 131                         device_link_add(dev, pre->dev, DL_FLAG_AUTOREMOVE);
 132                         return pre;
 133                 }
 134         }
 135         mutex_unlock(&ipu_pre_list_mutex);
 136
 137         return NULL;
 138 }
 139
 140 int ipu_pre_get(struct ipu_pre *pre)
 141 {
 142         u32 val;
 143
 144         if (pre->in_use)
 145                 return -EBUSY;
 146
 147         /* first get the engine out of reset and remove clock gating */
 148         writel(0, pre->regs + IPU_PRE_CTRL);
 149
 150         /* init defaults that should be applied to all streams */
 151         val = IPU_PRE_CTRL_HANDSHAKE_ABORT_SKIP_EN |
 152               IPU_PRE_CTRL_HANDSHAKE_EN |
 153               IPU_PRE_CTRL_TPR_REST_SEL |
 154               IPU_PRE_CTRL_SDW_UPDATE;
 155         writel(val, pre->regs + IPU_PRE_CTRL);
 156
 157         pre->in_use = true;
 158         return 0;
 159 }
 160
 161 void ipu_pre_put(struct ipu_pre *pre)
 162 {
 163         writel(IPU_PRE_CTRL_SFTRST, pre->regs + IPU_PRE_CTRL);
 164
 165         pre->in_use = false;
 166 }
 167
 168 void ipu_pre_configure(struct ipu_pre *pre, unsigned int width,
 169                        unsigned int height, unsigned int stride, u32 format,
 170                        uint64_t modifier, unsigned int bufaddr)
 171 {
 172         const struct drm_format_info *info = drm_format_info(format);
 173         u32 active_bpp = info->cpp[0] >> 1;
 174         u32 val;
 175
 176         /* calculate safe window for ctrl register updates */
 177         if (modifier == DRM_FORMAT_MOD_LINEAR)
 178                 pre->safe_window_end = height - 2;
 179         else
 180                 pre->safe_window_end = DIV_ROUND_UP(height, 4) - 1;
 181
 182         writel(bufaddr, pre->regs + IPU_PRE_CUR_BUF);
 183         writel(bufaddr, pre->regs + IPU_PRE_NEXT_BUF);
 184
 185         val = IPU_PRE_PREF_ENG_CTRL_INPUT_PIXEL_FORMAT(0) |
 186               IPU_PRE_PREF_ENG_CTRL_INPUT_ACTIVE_BPP(active_bpp) |
 187               IPU_PRE_PREF_ENG_CTRL_RD_NUM_BYTES(4) |
 188               IPU_PRE_PREF_ENG_CTRL_SHIFT_BYPASS |
 189               IPU_PRE_PREF_ENG_CTRL_PREFETCH_EN;
 190         writel(val, pre->regs + IPU_PRE_PREFETCH_ENG_CTRL);
 191
 192         val = IPU_PRE_PREFETCH_ENG_INPUT_SIZE_WIDTH(width) |
 193               IPU_PRE_PREFETCH_ENG_INPUT_SIZE_HEIGHT(height);
 194         writel(val, pre->regs + IPU_PRE_PREFETCH_ENG_INPUT_SIZE);
 195
 196         val = IPU_PRE_PREFETCH_ENG_PITCH_Y(stride);
 197         writel(val, pre->regs + IPU_PRE_PREFETCH_ENG_PITCH);
 198
 199         val = IPU_PRE_STORE_ENG_CTRL_OUTPUT_ACTIVE_BPP(active_bpp) |
 200               IPU_PRE_STORE_ENG_CTRL_WR_NUM_BYTES(4) |
 201               IPU_PRE_STORE_ENG_CTRL_STORE_EN;
 202         writel(val, pre->regs + IPU_PRE_STORE_ENG_CTRL);
 203
 204         val = IPU_PRE_STORE_ENG_SIZE_INPUT_WIDTH(width) |
 205               IPU_PRE_STORE_ENG_SIZE_INPUT_HEIGHT(height);
 206         writel(val, pre->regs + IPU_PRE_STORE_ENG_SIZE);
 207
 208         val = IPU_PRE_STORE_ENG_PITCH_OUT_PITCH(stride);
 209         writel(val, pre->regs + IPU_PRE_STORE_ENG_PITCH);
 210
 211         writel(pre->buffer_paddr, pre->regs + IPU_PRE_STORE_ENG_ADDR);
 212
 213         val = readl(pre->regs + IPU_PRE_TPR_CTRL);
 214         val &= ~IPU_PRE_TPR_CTRL_TILE_FORMAT_MASK;
 215         if (modifier != DRM_FORMAT_MOD_LINEAR) {
 216                 /* only support single buffer formats for now */
 217                 val |= IPU_PRE_TPR_CTRL_TILE_FORMAT_SINGLE_BUF;
 218                 if (modifier == DRM_FORMAT_MOD_VIVANTE_SUPER_TILED)
 219                         val |= IPU_PRE_TPR_CTRL_TILE_FORMAT_SUPER_TILED;
 220                 if (info->cpp[0] == 2)
 221                         val |= IPU_PRE_TPR_CTRL_TILE_FORMAT_16_BIT;
 222         }
 223         writel(val, pre->regs + IPU_PRE_TPR_CTRL);
 224
 225         val = readl(pre->regs + IPU_PRE_CTRL);
 226         val |= IPU_PRE_CTRL_EN_REPEAT | IPU_PRE_CTRL_ENABLE |
 227                IPU_PRE_CTRL_SDW_UPDATE;
 228         if (modifier == DRM_FORMAT_MOD_LINEAR)
 229                 val &= ~IPU_PRE_CTRL_BLOCK_EN;
 230         else
 231                 val |= IPU_PRE_CTRL_BLOCK_EN;
 232         writel(val, pre->regs + IPU_PRE_CTRL);
 233 }
 234
 235 void ipu_pre_update(struct ipu_pre *pre, unsigned int bufaddr)
 236 {
 237         unsigned long timeout = jiffies + msecs_to_jiffies(5);
 238         unsigned short current_yblock;
 239         u32 val;
 240
 241         writel(bufaddr, pre->regs + IPU_PRE_NEXT_BUF);
 242
 243         do {
 244                 if (time_after(jiffies, timeout)) {
 245                         dev_warn(pre->dev, "timeout waiting for PRE safe window\n");
 246                         return;
 247                 }
 248
 249                 val = readl(pre->regs + IPU_PRE_STORE_ENG_STATUS);
 250                 current_yblock =
 251                         (val >> IPU_PRE_STORE_ENG_STATUS_STORE_BLOCK_Y_SHIFT) &
 252                         IPU_PRE_STORE_ENG_STATUS_STORE_BLOCK_Y_MASK;
 253         } while (current_yblock == 0 || current_yblock >= pre->safe_window_end);
 254
 255         writel(IPU_PRE_CTRL_SDW_UPDATE, pre->regs + IPU_PRE_CTRL_SET);
 256 }
 257
 258 u32 ipu_pre_get_baddr(struct ipu_pre *pre)
 259 {
 260         return (u32)pre->buffer_paddr;
 261 }
 262
 263 static int ipu_pre_probe(struct platform_device *pdev)
 264 {
 265         struct device *dev = &pdev->dev;
 266         struct resource *res;
 267         struct ipu_pre *pre;
 268
 269         pre = devm_kzalloc(dev, sizeof(*pre), GFP_KERNEL);
 270         if (!pre)
 271                 return -ENOMEM;
 272
 273         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 274         pre->regs = devm_ioremap_resource(&pdev->dev, res);
 275         if (IS_ERR(pre->regs))
 276                 return PTR_ERR(pre->regs);
 277
 278         pre->clk_axi = devm_clk_get(dev, "axi");
 279         if (IS_ERR(pre->clk_axi))
 280                 return PTR_ERR(pre->clk_axi);
 281
 282         pre->iram = of_gen_pool_get(dev->of_node, "fsl,iram", 0);
 283         if (!pre->iram)
 284                 return -EPROBE_DEFER;
 285
 286         /*
 287          * Allocate IRAM buffer with maximum size. This could be made dynamic,
 288          * but as there is no other user of this IRAM region and we can fit all
 289          * max sized buffers into it, there is no need yet.
 290          */
 291         pre->buffer_virt = gen_pool_dma_alloc(pre->iram, IPU_PRE_MAX_WIDTH *
 292                                               IPU_PRE_NUM_SCANLINES * 4,
 293                                               &pre->buffer_paddr);
 294         if (!pre->buffer_virt)
 295                 return -ENOMEM;
 296
 297         clk_prepare_enable(pre->clk_axi);
 298
 299         pre->dev = dev;
 300         platform_set_drvdata(pdev, pre);
 301         mutex_lock(&ipu_pre_list_mutex);
 302         list_add(&pre->list, &ipu_pre_list);
 303         available_pres++;
 304         mutex_unlock(&ipu_pre_list_mutex);
 305
 306         return 0;
 307 }
 308
 309 static int ipu_pre_remove(struct platform_device *pdev)
 310 {
 311         struct ipu_pre *pre = platform_get_drvdata(pdev);
 312
 313         mutex_lock(&ipu_pre_list_mutex);
 314         list_del(&pre->list);
 315         available_pres--;
 316         mutex_unlock(&ipu_pre_list_mutex);
 317
 318         clk_disable_unprepare(pre->clk_axi);
 319
 320         if (pre->buffer_virt)
 321                 gen_pool_free(pre->iram, (unsigned long)pre->buffer_virt,
 322                               IPU_PRE_MAX_WIDTH * IPU_PRE_NUM_SCANLINES * 4);
 323         return 0;
 324 }
 325
 326 static const struct of_device_id ipu_pre_dt_ids[] = {
 327         { .compatible = "fsl,imx6qp-pre", },
 328         { /* sentinel */ },
 329 };
 330
 331 struct platform_driver ipu_pre_drv = {
 332         .probe          = ipu_pre_probe,
 333         .remove         = ipu_pre_remove,
 334         .driver         = {
 335                 .name   = "imx-ipu-pre",
 336                 .of_match_table = ipu_pre_dt_ids,
 337         },
 338 };