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