1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2016-2017 Lucas Stach, Pengutronix 4 */ 5 6 #include <drm/drm_fourcc.h> 7 #include <linux/clk.h> 8 #include <linux/err.h> 9 #include <linux/iopoll.h> 10 #include <linux/mfd/syscon.h> 11 #include <linux/mfd/syscon/imx6q-iomuxc-gpr.h> 12 #include <linux/module.h> 13 #include <linux/of.h> 14 #include <linux/platform_device.h> 15 #include <linux/pm_runtime.h> 16 #include <linux/regmap.h> 17 #include <video/imx-ipu-v3.h> 18 19 #include "ipu-prv.h" 20 21 #define IPU_PRG_CTL 0x00 22 #define IPU_PRG_CTL_BYPASS(i) (1 << (0 + i)) 23 #define IPU_PRG_CTL_SOFT_ARID_MASK 0x3 24 #define IPU_PRG_CTL_SOFT_ARID_SHIFT(i) (8 + i * 2) 25 #define IPU_PRG_CTL_SOFT_ARID(i, v) ((v & 0x3) << (8 + 2 * i)) 26 #define IPU_PRG_CTL_SO(i) (1 << (16 + i)) 27 #define IPU_PRG_CTL_VFLIP(i) (1 << (19 + i)) 28 #define IPU_PRG_CTL_BLOCK_MODE(i) (1 << (22 + i)) 29 #define IPU_PRG_CTL_CNT_LOAD_EN(i) (1 << (25 + i)) 30 #define IPU_PRG_CTL_SOFTRST (1 << 30) 31 #define IPU_PRG_CTL_SHADOW_EN (1 << 31) 32 33 #define IPU_PRG_STATUS 0x04 34 #define IPU_PRG_STATUS_BUFFER0_READY(i) (1 << (0 + i * 2)) 35 #define IPU_PRG_STATUS_BUFFER1_READY(i) (1 << (1 + i * 2)) 36 37 #define IPU_PRG_QOS 0x08 38 #define IPU_PRG_QOS_ARID_MASK 0xf 39 #define IPU_PRG_QOS_ARID_SHIFT(i) (0 + i * 4) 40 41 #define IPU_PRG_REG_UPDATE 0x0c 42 #define IPU_PRG_REG_UPDATE_REG_UPDATE (1 << 0) 43 44 #define IPU_PRG_STRIDE(i) (0x10 + i * 0x4) 45 #define IPU_PRG_STRIDE_STRIDE_MASK 0x3fff 46 47 #define IPU_PRG_CROP_LINE 0x1c 48 49 #define IPU_PRG_THD 0x20 50 51 #define IPU_PRG_BADDR(i) (0x24 + i * 0x4) 52 53 #define IPU_PRG_OFFSET(i) (0x30 + i * 0x4) 54 55 #define IPU_PRG_ILO(i) (0x3c + i * 0x4) 56 57 #define IPU_PRG_HEIGHT(i) (0x48 + i * 0x4) 58 #define IPU_PRG_HEIGHT_PRE_HEIGHT_MASK 0xfff 59 #define IPU_PRG_HEIGHT_PRE_HEIGHT_SHIFT 0 60 #define IPU_PRG_HEIGHT_IPU_HEIGHT_MASK 0xfff 61 #define IPU_PRG_HEIGHT_IPU_HEIGHT_SHIFT 16 62 63 struct ipu_prg_channel { 64 bool enabled; 65 int used_pre; 66 }; 67 68 struct ipu_prg { 69 struct list_head list; 70 struct device *dev; 71 int id; 72 73 void __iomem *regs; 74 struct clk *clk_ipg, *clk_axi; 75 struct regmap *iomuxc_gpr; 76 struct ipu_pre *pres[3]; 77 78 struct ipu_prg_channel chan[3]; 79 }; 80 81 static DEFINE_MUTEX(ipu_prg_list_mutex); 82 static LIST_HEAD(ipu_prg_list); 83 84 struct ipu_prg * 85 ipu_prg_lookup_by_phandle(struct device *dev, const char *name, int ipu_id) 86 { 87 struct device_node *prg_node = of_parse_phandle(dev->of_node, 88 name, 0); 89 struct ipu_prg *prg; 90 91 mutex_lock(&ipu_prg_list_mutex); 92 list_for_each_entry(prg, &ipu_prg_list, list) { 93 if (prg_node == prg->dev->of_node) { 94 mutex_unlock(&ipu_prg_list_mutex); 95 device_link_add(dev, prg->dev, 96 DL_FLAG_AUTOREMOVE_CONSUMER); 97 prg->id = ipu_id; 98 of_node_put(prg_node); 99 return prg; 100 } 101 } 102 mutex_unlock(&ipu_prg_list_mutex); 103 104 of_node_put(prg_node); 105 106 return NULL; 107 } 108 109 int ipu_prg_max_active_channels(void) 110 { 111 return ipu_pre_get_available_count(); 112 } 113 EXPORT_SYMBOL_GPL(ipu_prg_max_active_channels); 114 115 bool ipu_prg_present(struct ipu_soc *ipu) 116 { 117 if (ipu->prg_priv) 118 return true; 119 120 return false; 121 } 122 EXPORT_SYMBOL_GPL(ipu_prg_present); 123 124 bool ipu_prg_format_supported(struct ipu_soc *ipu, uint32_t format, 125 uint64_t modifier) 126 { 127 const struct drm_format_info *info = drm_format_info(format); 128 129 if (info->num_planes != 1) 130 return false; 131 132 switch (modifier) { 133 case DRM_FORMAT_MOD_LINEAR: 134 case DRM_FORMAT_MOD_VIVANTE_TILED: 135 case DRM_FORMAT_MOD_VIVANTE_SUPER_TILED: 136 return true; 137 default: 138 return false; 139 } 140 } 141 EXPORT_SYMBOL_GPL(ipu_prg_format_supported); 142 143 int ipu_prg_enable(struct ipu_soc *ipu) 144 { 145 struct ipu_prg *prg = ipu->prg_priv; 146 147 if (!prg) 148 return 0; 149 150 return pm_runtime_get_sync(prg->dev); 151 } 152 EXPORT_SYMBOL_GPL(ipu_prg_enable); 153 154 void ipu_prg_disable(struct ipu_soc *ipu) 155 { 156 struct ipu_prg *prg = ipu->prg_priv; 157 158 if (!prg) 159 return; 160 161 pm_runtime_put(prg->dev); 162 } 163 EXPORT_SYMBOL_GPL(ipu_prg_disable); 164 165 /* 166 * The channel configuartion functions below are not thread safe, as they 167 * must be only called from the atomic commit path in the DRM driver, which 168 * is properly serialized. 169 */ 170 static int ipu_prg_ipu_to_prg_chan(int ipu_chan) 171 { 172 /* 173 * This isn't clearly documented in the RM, but IPU to PRG channel 174 * assignment is fixed, as only with this mapping the control signals 175 * match up. 176 */ 177 switch (ipu_chan) { 178 case IPUV3_CHANNEL_MEM_BG_SYNC: 179 return 0; 180 case IPUV3_CHANNEL_MEM_FG_SYNC: 181 return 1; 182 case IPUV3_CHANNEL_MEM_DC_SYNC: 183 return 2; 184 default: 185 return -EINVAL; 186 } 187 } 188 189 static int ipu_prg_get_pre(struct ipu_prg *prg, int prg_chan) 190 { 191 int i, ret; 192 193 /* channel 0 is special as it is hardwired to one of the PREs */ 194 if (prg_chan == 0) { 195 ret = ipu_pre_get(prg->pres[0]); 196 if (ret) 197 goto fail; 198 prg->chan[prg_chan].used_pre = 0; 199 return 0; 200 } 201 202 for (i = 1; i < 3; i++) { 203 ret = ipu_pre_get(prg->pres[i]); 204 if (!ret) { 205 u32 val, mux; 206 int shift; 207 208 prg->chan[prg_chan].used_pre = i; 209 210 /* configure the PRE to PRG channel mux */ 211 shift = (i == 1) ? 12 : 14; 212 mux = (prg->id << 1) | (prg_chan - 1); 213 regmap_update_bits(prg->iomuxc_gpr, IOMUXC_GPR5, 214 0x3 << shift, mux << shift); 215 216 /* check other mux, must not point to same channel */ 217 shift = (i == 1) ? 14 : 12; 218 regmap_read(prg->iomuxc_gpr, IOMUXC_GPR5, &val); 219 if (((val >> shift) & 0x3) == mux) { 220 regmap_update_bits(prg->iomuxc_gpr, IOMUXC_GPR5, 221 0x3 << shift, 222 (mux ^ 0x1) << shift); 223 } 224 225 return 0; 226 } 227 } 228 229 fail: 230 dev_err(prg->dev, "could not get PRE for PRG chan %d", prg_chan); 231 return ret; 232 } 233 234 static void ipu_prg_put_pre(struct ipu_prg *prg, int prg_chan) 235 { 236 struct ipu_prg_channel *chan = &prg->chan[prg_chan]; 237 238 ipu_pre_put(prg->pres[chan->used_pre]); 239 chan->used_pre = -1; 240 } 241 242 void ipu_prg_channel_disable(struct ipuv3_channel *ipu_chan) 243 { 244 int prg_chan = ipu_prg_ipu_to_prg_chan(ipu_chan->num); 245 struct ipu_prg *prg = ipu_chan->ipu->prg_priv; 246 struct ipu_prg_channel *chan; 247 u32 val; 248 249 if (prg_chan < 0) 250 return; 251 252 chan = &prg->chan[prg_chan]; 253 if (!chan->enabled) 254 return; 255 256 pm_runtime_get_sync(prg->dev); 257 258 val = readl(prg->regs + IPU_PRG_CTL); 259 val |= IPU_PRG_CTL_BYPASS(prg_chan); 260 writel(val, prg->regs + IPU_PRG_CTL); 261 262 val = IPU_PRG_REG_UPDATE_REG_UPDATE; 263 writel(val, prg->regs + IPU_PRG_REG_UPDATE); 264 265 pm_runtime_put(prg->dev); 266 267 ipu_prg_put_pre(prg, prg_chan); 268 269 chan->enabled = false; 270 } 271 EXPORT_SYMBOL_GPL(ipu_prg_channel_disable); 272 273 int ipu_prg_channel_configure(struct ipuv3_channel *ipu_chan, 274 unsigned int axi_id, unsigned int width, 275 unsigned int height, unsigned int stride, 276 u32 format, uint64_t modifier, unsigned long *eba) 277 { 278 int prg_chan = ipu_prg_ipu_to_prg_chan(ipu_chan->num); 279 struct ipu_prg *prg = ipu_chan->ipu->prg_priv; 280 struct ipu_prg_channel *chan; 281 u32 val; 282 int ret; 283 284 if (prg_chan < 0) 285 return prg_chan; 286 287 chan = &prg->chan[prg_chan]; 288 289 if (chan->enabled) { 290 ipu_pre_update(prg->pres[chan->used_pre], *eba); 291 return 0; 292 } 293 294 ret = ipu_prg_get_pre(prg, prg_chan); 295 if (ret) 296 return ret; 297 298 ipu_pre_configure(prg->pres[chan->used_pre], 299 width, height, stride, format, modifier, *eba); 300 301 302 pm_runtime_get_sync(prg->dev); 303 304 val = (stride - 1) & IPU_PRG_STRIDE_STRIDE_MASK; 305 writel(val, prg->regs + IPU_PRG_STRIDE(prg_chan)); 306 307 val = ((height & IPU_PRG_HEIGHT_PRE_HEIGHT_MASK) << 308 IPU_PRG_HEIGHT_PRE_HEIGHT_SHIFT) | 309 ((height & IPU_PRG_HEIGHT_IPU_HEIGHT_MASK) << 310 IPU_PRG_HEIGHT_IPU_HEIGHT_SHIFT); 311 writel(val, prg->regs + IPU_PRG_HEIGHT(prg_chan)); 312 313 val = ipu_pre_get_baddr(prg->pres[chan->used_pre]); 314 *eba = val; 315 writel(val, prg->regs + IPU_PRG_BADDR(prg_chan)); 316 317 val = readl(prg->regs + IPU_PRG_CTL); 318 /* config AXI ID */ 319 val &= ~(IPU_PRG_CTL_SOFT_ARID_MASK << 320 IPU_PRG_CTL_SOFT_ARID_SHIFT(prg_chan)); 321 val |= IPU_PRG_CTL_SOFT_ARID(prg_chan, axi_id); 322 /* enable channel */ 323 val &= ~IPU_PRG_CTL_BYPASS(prg_chan); 324 writel(val, prg->regs + IPU_PRG_CTL); 325 326 val = IPU_PRG_REG_UPDATE_REG_UPDATE; 327 writel(val, prg->regs + IPU_PRG_REG_UPDATE); 328 329 /* wait for both double buffers to be filled */ 330 readl_poll_timeout(prg->regs + IPU_PRG_STATUS, val, 331 (val & IPU_PRG_STATUS_BUFFER0_READY(prg_chan)) && 332 (val & IPU_PRG_STATUS_BUFFER1_READY(prg_chan)), 333 5, 1000); 334 335 pm_runtime_put(prg->dev); 336 337 chan->enabled = true; 338 return 0; 339 } 340 EXPORT_SYMBOL_GPL(ipu_prg_channel_configure); 341 342 bool ipu_prg_channel_configure_pending(struct ipuv3_channel *ipu_chan) 343 { 344 int prg_chan = ipu_prg_ipu_to_prg_chan(ipu_chan->num); 345 struct ipu_prg *prg = ipu_chan->ipu->prg_priv; 346 struct ipu_prg_channel *chan; 347 348 if (prg_chan < 0) 349 return false; 350 351 chan = &prg->chan[prg_chan]; 352 WARN_ON(!chan->enabled); 353 354 return ipu_pre_update_pending(prg->pres[chan->used_pre]); 355 } 356 EXPORT_SYMBOL_GPL(ipu_prg_channel_configure_pending); 357 358 static int ipu_prg_probe(struct platform_device *pdev) 359 { 360 struct device *dev = &pdev->dev; 361 struct resource *res; 362 struct ipu_prg *prg; 363 u32 val; 364 int i, ret; 365 366 prg = devm_kzalloc(dev, sizeof(*prg), GFP_KERNEL); 367 if (!prg) 368 return -ENOMEM; 369 370 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 371 prg->regs = devm_ioremap_resource(&pdev->dev, res); 372 if (IS_ERR(prg->regs)) 373 return PTR_ERR(prg->regs); 374 375 376 prg->clk_ipg = devm_clk_get(dev, "ipg"); 377 if (IS_ERR(prg->clk_ipg)) 378 return PTR_ERR(prg->clk_ipg); 379 380 prg->clk_axi = devm_clk_get(dev, "axi"); 381 if (IS_ERR(prg->clk_axi)) 382 return PTR_ERR(prg->clk_axi); 383 384 prg->iomuxc_gpr = 385 syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr"); 386 if (IS_ERR(prg->iomuxc_gpr)) 387 return PTR_ERR(prg->iomuxc_gpr); 388 389 for (i = 0; i < 3; i++) { 390 prg->pres[i] = ipu_pre_lookup_by_phandle(dev, "fsl,pres", i); 391 if (!prg->pres[i]) 392 return -EPROBE_DEFER; 393 } 394 395 ret = clk_prepare_enable(prg->clk_ipg); 396 if (ret) 397 return ret; 398 399 ret = clk_prepare_enable(prg->clk_axi); 400 if (ret) { 401 clk_disable_unprepare(prg->clk_ipg); 402 return ret; 403 } 404 405 /* init to free running mode */ 406 val = readl(prg->regs + IPU_PRG_CTL); 407 val |= IPU_PRG_CTL_SHADOW_EN; 408 writel(val, prg->regs + IPU_PRG_CTL); 409 410 /* disable address threshold */ 411 writel(0xffffffff, prg->regs + IPU_PRG_THD); 412 413 pm_runtime_set_active(dev); 414 pm_runtime_enable(dev); 415 416 prg->dev = dev; 417 platform_set_drvdata(pdev, prg); 418 mutex_lock(&ipu_prg_list_mutex); 419 list_add(&prg->list, &ipu_prg_list); 420 mutex_unlock(&ipu_prg_list_mutex); 421 422 return 0; 423 } 424 425 static int ipu_prg_remove(struct platform_device *pdev) 426 { 427 struct ipu_prg *prg = platform_get_drvdata(pdev); 428 429 mutex_lock(&ipu_prg_list_mutex); 430 list_del(&prg->list); 431 mutex_unlock(&ipu_prg_list_mutex); 432 433 return 0; 434 } 435 436 #ifdef CONFIG_PM 437 static int prg_suspend(struct device *dev) 438 { 439 struct ipu_prg *prg = dev_get_drvdata(dev); 440 441 clk_disable_unprepare(prg->clk_axi); 442 clk_disable_unprepare(prg->clk_ipg); 443 444 return 0; 445 } 446 447 static int prg_resume(struct device *dev) 448 { 449 struct ipu_prg *prg = dev_get_drvdata(dev); 450 int ret; 451 452 ret = clk_prepare_enable(prg->clk_ipg); 453 if (ret) 454 return ret; 455 456 ret = clk_prepare_enable(prg->clk_axi); 457 if (ret) { 458 clk_disable_unprepare(prg->clk_ipg); 459 return ret; 460 } 461 462 return 0; 463 } 464 #endif 465 466 static const struct dev_pm_ops prg_pm_ops = { 467 SET_RUNTIME_PM_OPS(prg_suspend, prg_resume, NULL) 468 }; 469 470 static const struct of_device_id ipu_prg_dt_ids[] = { 471 { .compatible = "fsl,imx6qp-prg", }, 472 { /* sentinel */ }, 473 }; 474 475 struct platform_driver ipu_prg_drv = { 476 .probe = ipu_prg_probe, 477 .remove = ipu_prg_remove, 478 .driver = { 479 .name = "imx-ipu-prg", 480 .pm = &prg_pm_ops, 481 .of_match_table = ipu_prg_dt_ids, 482 }, 483 }; 484