gpu/ipu-v3/ipu-prg.c

   1 /*
   2  * Copyright (c) 2016-2017 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/iopoll.h>
  18 #include <linux/mfd/syscon.h>
  19 #include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
  20 #include <linux/module.h>
  21 #include <linux/of.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/pm_runtime.h>
  24 #include <linux/regmap.h>
  25 #include <video/imx-ipu-v3.h>
  26
  27 #include "ipu-prv.h"
  28
  29 #define IPU_PRG_CTL                             0x00
  30 #define  IPU_PRG_CTL_BYPASS(i)                  (1 << (0 + i))
  31 #define  IPU_PRG_CTL_SOFT_ARID_MASK             0x3
  32 #define  IPU_PRG_CTL_SOFT_ARID_SHIFT(i)         (8 + i * 2)
  33 #define  IPU_PRG_CTL_SOFT_ARID(i, v)            ((v & 0x3) << (8 + 2 * i))
  34 #define  IPU_PRG_CTL_SO(i)                      (1 << (16 + i))
  35 #define  IPU_PRG_CTL_VFLIP(i)                   (1 << (19 + i))
  36 #define  IPU_PRG_CTL_BLOCK_MODE(i)              (1 << (22 + i))
  37 #define  IPU_PRG_CTL_CNT_LOAD_EN(i)             (1 << (25 + i))
  38 #define  IPU_PRG_CTL_SOFTRST                    (1 << 30)
  39 #define  IPU_PRG_CTL_SHADOW_EN                  (1 << 31)
  40
  41 #define IPU_PRG_STATUS                          0x04
  42 #define  IPU_PRG_STATUS_BUFFER0_READY(i)        (1 << (0 + i * 2))
  43 #define  IPU_PRG_STATUS_BUFFER1_READY(i)        (1 << (1 + i * 2))
  44
  45 #define IPU_PRG_QOS                             0x08
  46 #define  IPU_PRG_QOS_ARID_MASK                  0xf
  47 #define  IPU_PRG_QOS_ARID_SHIFT(i)              (0 + i * 4)
  48
  49 #define IPU_PRG_REG_UPDATE                      0x0c
  50 #define  IPU_PRG_REG_UPDATE_REG_UPDATE          (1 << 0)
  51
  52 #define IPU_PRG_STRIDE(i)                       (0x10 + i * 0x4)
  53 #define  IPU_PRG_STRIDE_STRIDE_MASK             0x3fff
  54
  55 #define IPU_PRG_CROP_LINE                       0x1c
  56
  57 #define IPU_PRG_THD                             0x20
  58
  59 #define IPU_PRG_BADDR(i)                        (0x24 + i * 0x4)
  60
  61 #define IPU_PRG_OFFSET(i)                       (0x30 + i * 0x4)
  62
  63 #define IPU_PRG_ILO(i)                          (0x3c + i * 0x4)
  64
  65 #define IPU_PRG_HEIGHT(i)                       (0x48 + i * 0x4)
  66 #define  IPU_PRG_HEIGHT_PRE_HEIGHT_MASK         0xfff
  67 #define  IPU_PRG_HEIGHT_PRE_HEIGHT_SHIFT        0
  68 #define  IPU_PRG_HEIGHT_IPU_HEIGHT_MASK         0xfff
  69 #define  IPU_PRG_HEIGHT_IPU_HEIGHT_SHIFT        16
  70
  71 struct ipu_prg_channel {
  72         bool                    enabled;
  73         int                     used_pre;
  74 };
  75
  76 struct ipu_prg {
  77         struct list_head        list;
  78         struct device           *dev;
  79         int                     id;
  80
  81         void __iomem            *regs;
  82         struct clk              *clk_ipg, *clk_axi;
  83         struct regmap           *iomuxc_gpr;
  84         struct ipu_pre          *pres[3];
  85
  86         struct ipu_prg_channel  chan[3];
  87 };
  88
  89 static DEFINE_MUTEX(ipu_prg_list_mutex);
  90 static LIST_HEAD(ipu_prg_list);
  91
  92 struct ipu_prg *
  93 ipu_prg_lookup_by_phandle(struct device *dev, const char *name, int ipu_id)
  94 {
  95         struct device_node *prg_node = of_parse_phandle(dev->of_node,
  96                                                         name, 0);
  97         struct ipu_prg *prg;
  98
  99         mutex_lock(&ipu_prg_list_mutex);
 100         list_for_each_entry(prg, &ipu_prg_list, list) {
 101                 if (prg_node == prg->dev->of_node) {
 102                         mutex_unlock(&ipu_prg_list_mutex);
 103                         device_link_add(dev, prg->dev,
 104                                         DL_FLAG_AUTOREMOVE_CONSUMER);
 105                         prg->id = ipu_id;
 106                         of_node_put(prg_node);
 107                         return prg;
 108                 }
 109         }
 110         mutex_unlock(&ipu_prg_list_mutex);
 111
 112         of_node_put(prg_node);
 113
 114         return NULL;
 115 }
 116
 117 int ipu_prg_max_active_channels(void)
 118 {
 119         return ipu_pre_get_available_count();
 120 }
 121 EXPORT_SYMBOL_GPL(ipu_prg_max_active_channels);
 122
 123 bool ipu_prg_present(struct ipu_soc *ipu)
 124 {
 125         if (ipu->prg_priv)
 126                 return true;
 127
 128         return false;
 129 }
 130 EXPORT_SYMBOL_GPL(ipu_prg_present);
 131
 132 bool ipu_prg_format_supported(struct ipu_soc *ipu, uint32_t format,
 133                               uint64_t modifier)
 134 {
 135         const struct drm_format_info *info = drm_format_info(format);
 136
 137         if (info->num_planes != 1)
 138                 return false;
 139
 140         switch (modifier) {
 141         case DRM_FORMAT_MOD_LINEAR:
 142         case DRM_FORMAT_MOD_VIVANTE_TILED:
 143         case DRM_FORMAT_MOD_VIVANTE_SUPER_TILED:
 144                 return true;
 145         default:
 146                 return false;
 147         }
 148 }
 149 EXPORT_SYMBOL_GPL(ipu_prg_format_supported);
 150
 151 int ipu_prg_enable(struct ipu_soc *ipu)
 152 {
 153         struct ipu_prg *prg = ipu->prg_priv;
 154
 155         if (!prg)
 156                 return 0;
 157
 158         return pm_runtime_get_sync(prg->dev);
 159 }
 160 EXPORT_SYMBOL_GPL(ipu_prg_enable);
 161
 162 void ipu_prg_disable(struct ipu_soc *ipu)
 163 {
 164         struct ipu_prg *prg = ipu->prg_priv;
 165
 166         if (!prg)
 167                 return;
 168
 169         pm_runtime_put(prg->dev);
 170 }
 171 EXPORT_SYMBOL_GPL(ipu_prg_disable);
 172
 173 /*
 174  * The channel configuartion functions below are not thread safe, as they
 175  * must be only called from the atomic commit path in the DRM driver, which
 176  * is properly serialized.
 177  */
 178 static int ipu_prg_ipu_to_prg_chan(int ipu_chan)
 179 {
 180         /*
 181          * This isn't clearly documented in the RM, but IPU to PRG channel
 182          * assignment is fixed, as only with this mapping the control signals
 183          * match up.
 184          */
 185         switch (ipu_chan) {
 186         case IPUV3_CHANNEL_MEM_BG_SYNC:
 187                 return 0;
 188         case IPUV3_CHANNEL_MEM_FG_SYNC:
 189                 return 1;
 190         case IPUV3_CHANNEL_MEM_DC_SYNC:
 191                 return 2;
 192         default:
 193                 return -EINVAL;
 194         }
 195 }
 196
 197 static int ipu_prg_get_pre(struct ipu_prg *prg, int prg_chan)
 198 {
 199         int i, ret;
 200
 201         /* channel 0 is special as it is hardwired to one of the PREs */
 202         if (prg_chan == 0) {
 203                 ret = ipu_pre_get(prg->pres[0]);
 204                 if (ret)
 205                         goto fail;
 206                 prg->chan[prg_chan].used_pre = 0;
 207                 return 0;
 208         }
 209
 210         for (i = 1; i < 3; i++) {
 211                 ret = ipu_pre_get(prg->pres[i]);
 212                 if (!ret) {
 213                         u32 val, mux;
 214                         int shift;
 215
 216                         prg->chan[prg_chan].used_pre = i;
 217
 218                         /* configure the PRE to PRG channel mux */
 219                         shift = (i == 1) ? 12 : 14;
 220                         mux = (prg->id << 1) | (prg_chan - 1);
 221                         regmap_update_bits(prg->iomuxc_gpr, IOMUXC_GPR5,
 222                                            0x3 << shift, mux << shift);
 223
 224                         /* check other mux, must not point to same channel */
 225                         shift = (i == 1) ? 14 : 12;
 226                         regmap_read(prg->iomuxc_gpr, IOMUXC_GPR5, &val);
 227                         if (((val >> shift) & 0x3) == mux) {
 228                                 regmap_update_bits(prg->iomuxc_gpr, IOMUXC_GPR5,
 229                                                    0x3 << shift,
 230                                                    (mux ^ 0x1) << shift);
 231                         }
 232
 233                         return 0;
 234                 }
 235         }
 236
 237 fail:
 238         dev_err(prg->dev, "could not get PRE for PRG chan %d", prg_chan);
 239         return ret;
 240 }
 241
 242 static void ipu_prg_put_pre(struct ipu_prg *prg, int prg_chan)
 243 {
 244         struct ipu_prg_channel *chan = &prg->chan[prg_chan];
 245
 246         ipu_pre_put(prg->pres[chan->used_pre]);
 247         chan->used_pre = -1;
 248 }
 249
 250 void ipu_prg_channel_disable(struct ipuv3_channel *ipu_chan)
 251 {
 252         int prg_chan = ipu_prg_ipu_to_prg_chan(ipu_chan->num);
 253         struct ipu_prg *prg = ipu_chan->ipu->prg_priv;
 254         struct ipu_prg_channel *chan;
 255         u32 val;
 256
 257         if (prg_chan < 0)
 258                 return;
 259
 260         chan = &prg->chan[prg_chan];
 261         if (!chan->enabled)
 262                 return;
 263
 264         pm_runtime_get_sync(prg->dev);
 265
 266         val = readl(prg->regs + IPU_PRG_CTL);
 267         val |= IPU_PRG_CTL_BYPASS(prg_chan);
 268         writel(val, prg->regs + IPU_PRG_CTL);
 269
 270         val = IPU_PRG_REG_UPDATE_REG_UPDATE;
 271         writel(val, prg->regs + IPU_PRG_REG_UPDATE);
 272
 273         pm_runtime_put(prg->dev);
 274
 275         ipu_prg_put_pre(prg, prg_chan);
 276
 277         chan->enabled = false;
 278 }
 279 EXPORT_SYMBOL_GPL(ipu_prg_channel_disable);
 280
 281 int ipu_prg_channel_configure(struct ipuv3_channel *ipu_chan,
 282                               unsigned int axi_id, unsigned int width,
 283                               unsigned int height, unsigned int stride,
 284                               u32 format, uint64_t modifier, unsigned long *eba)
 285 {
 286         int prg_chan = ipu_prg_ipu_to_prg_chan(ipu_chan->num);
 287         struct ipu_prg *prg = ipu_chan->ipu->prg_priv;
 288         struct ipu_prg_channel *chan;
 289         u32 val;
 290         int ret;
 291
 292         if (prg_chan < 0)
 293                 return prg_chan;
 294
 295         chan = &prg->chan[prg_chan];
 296
 297         if (chan->enabled) {
 298                 ipu_pre_update(prg->pres[chan->used_pre], *eba);
 299                 return 0;
 300         }
 301
 302         ret = ipu_prg_get_pre(prg, prg_chan);
 303         if (ret)
 304                 return ret;
 305
 306         ipu_pre_configure(prg->pres[chan->used_pre],
 307                           width, height, stride, format, modifier, *eba);
 308
 309
 310         pm_runtime_get_sync(prg->dev);
 311
 312         val = (stride - 1) & IPU_PRG_STRIDE_STRIDE_MASK;
 313         writel(val, prg->regs + IPU_PRG_STRIDE(prg_chan));
 314
 315         val = ((height & IPU_PRG_HEIGHT_PRE_HEIGHT_MASK) <<
 316                IPU_PRG_HEIGHT_PRE_HEIGHT_SHIFT) |
 317               ((height & IPU_PRG_HEIGHT_IPU_HEIGHT_MASK) <<
 318                IPU_PRG_HEIGHT_IPU_HEIGHT_SHIFT);
 319         writel(val, prg->regs + IPU_PRG_HEIGHT(prg_chan));
 320
 321         val = ipu_pre_get_baddr(prg->pres[chan->used_pre]);
 322         *eba = val;
 323         writel(val, prg->regs + IPU_PRG_BADDR(prg_chan));
 324
 325         val = readl(prg->regs + IPU_PRG_CTL);
 326         /* config AXI ID */
 327         val &= ~(IPU_PRG_CTL_SOFT_ARID_MASK <<
 328                  IPU_PRG_CTL_SOFT_ARID_SHIFT(prg_chan));
 329         val |= IPU_PRG_CTL_SOFT_ARID(prg_chan, axi_id);
 330         /* enable channel */
 331         val &= ~IPU_PRG_CTL_BYPASS(prg_chan);
 332         writel(val, prg->regs + IPU_PRG_CTL);
 333
 334         val = IPU_PRG_REG_UPDATE_REG_UPDATE;
 335         writel(val, prg->regs + IPU_PRG_REG_UPDATE);
 336
 337         /* wait for both double buffers to be filled */
 338         readl_poll_timeout(prg->regs + IPU_PRG_STATUS, val,
 339                            (val & IPU_PRG_STATUS_BUFFER0_READY(prg_chan)) &&
 340                            (val & IPU_PRG_STATUS_BUFFER1_READY(prg_chan)),
 341                            5, 1000);
 342
 343         pm_runtime_put(prg->dev);
 344
 345         chan->enabled = true;
 346         return 0;
 347 }
 348 EXPORT_SYMBOL_GPL(ipu_prg_channel_configure);
 349
 350 static int ipu_prg_probe(struct platform_device *pdev)
 351 {
 352         struct device *dev = &pdev->dev;
 353         struct resource *res;
 354         struct ipu_prg *prg;
 355         u32 val;
 356         int i, ret;
 357
 358         prg = devm_kzalloc(dev, sizeof(*prg), GFP_KERNEL);
 359         if (!prg)
 360                 return -ENOMEM;
 361
 362         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 363         prg->regs = devm_ioremap_resource(&pdev->dev, res);
 364         if (IS_ERR(prg->regs))
 365                 return PTR_ERR(prg->regs);
 366
 367
 368         prg->clk_ipg = devm_clk_get(dev, "ipg");
 369         if (IS_ERR(prg->clk_ipg))
 370                 return PTR_ERR(prg->clk_ipg);
 371
 372         prg->clk_axi = devm_clk_get(dev, "axi");
 373         if (IS_ERR(prg->clk_axi))
 374                 return PTR_ERR(prg->clk_axi);
 375
 376         prg->iomuxc_gpr =
 377                 syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr");
 378         if (IS_ERR(prg->iomuxc_gpr))
 379                 return PTR_ERR(prg->iomuxc_gpr);
 380
 381         for (i = 0; i < 3; i++) {
 382                 prg->pres[i] = ipu_pre_lookup_by_phandle(dev, "fsl,pres", i);
 383                 if (!prg->pres[i])
 384                         return -EPROBE_DEFER;
 385         }
 386
 387         ret = clk_prepare_enable(prg->clk_ipg);
 388         if (ret)
 389                 return ret;
 390
 391         ret = clk_prepare_enable(prg->clk_axi);
 392         if (ret) {
 393                 clk_disable_unprepare(prg->clk_ipg);
 394                 return ret;
 395         }
 396
 397         /* init to free running mode */
 398         val = readl(prg->regs + IPU_PRG_CTL);
 399         val |= IPU_PRG_CTL_SHADOW_EN;
 400         writel(val, prg->regs + IPU_PRG_CTL);
 401
 402         /* disable address threshold */
 403         writel(0xffffffff, prg->regs + IPU_PRG_THD);
 404
 405         pm_runtime_set_active(dev);
 406         pm_runtime_enable(dev);
 407
 408         prg->dev = dev;
 409         platform_set_drvdata(pdev, prg);
 410         mutex_lock(&ipu_prg_list_mutex);
 411         list_add(&prg->list, &ipu_prg_list);
 412         mutex_unlock(&ipu_prg_list_mutex);
 413
 414         return 0;
 415 }
 416
 417 static int ipu_prg_remove(struct platform_device *pdev)
 418 {
 419         struct ipu_prg *prg = platform_get_drvdata(pdev);
 420
 421         mutex_lock(&ipu_prg_list_mutex);
 422         list_del(&prg->list);
 423         mutex_unlock(&ipu_prg_list_mutex);
 424
 425         return 0;
 426 }
 427
 428 #ifdef CONFIG_PM
 429 static int prg_suspend(struct device *dev)
 430 {
 431         struct ipu_prg *prg = dev_get_drvdata(dev);
 432
 433         clk_disable_unprepare(prg->clk_axi);
 434         clk_disable_unprepare(prg->clk_ipg);
 435
 436         return 0;
 437 }
 438
 439 static int prg_resume(struct device *dev)
 440 {
 441         struct ipu_prg *prg = dev_get_drvdata(dev);
 442         int ret;
 443
 444         ret = clk_prepare_enable(prg->clk_ipg);
 445         if (ret)
 446                 return ret;
 447
 448         ret = clk_prepare_enable(prg->clk_axi);
 449         if (ret) {
 450                 clk_disable_unprepare(prg->clk_ipg);
 451                 return ret;
 452         }
 453
 454         return 0;
 455 }
 456 #endif
 457
 458 static const struct dev_pm_ops prg_pm_ops = {
 459         SET_RUNTIME_PM_OPS(prg_suspend, prg_resume, NULL)
 460 };
 461
 462 static const struct of_device_id ipu_prg_dt_ids[] = {
 463         { .compatible = "fsl,imx6qp-prg", },
 464         { /* sentinel */ },
 465 };
 466
 467 struct platform_driver ipu_prg_drv = {
 468         .probe          = ipu_prg_probe,
 469         .remove         = ipu_prg_remove,
 470         .driver         = {
 471                 .name   = "imx-ipu-prg",
 472                 .pm     = &prg_pm_ops,
 473                 .of_match_table = ipu_prg_dt_ids,
 474         },
 475 };