1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * tw68-core.c 4 * Core functions for the Techwell 68xx driver 5 * 6 * Much of this code is derived from the cx88 and sa7134 drivers, which 7 * were in turn derived from the bt87x driver. The original work was by 8 * Gerd Knorr; more recently the code was enhanced by Mauro Carvalho Chehab, 9 * Hans Verkuil, Andy Walls and many others. Their work is gratefully 10 * acknowledged. Full credit goes to them - any problems within this code 11 * are mine. 12 * 13 * Copyright (C) 2009 William M. Brack 14 * 15 * Refactored and updated to the latest v4l core frameworks: 16 * 17 * Copyright (C) 2014 Hans Verkuil <hverkuil@xs4all.nl> 18 */ 19 20 #include <linux/init.h> 21 #include <linux/list.h> 22 #include <linux/module.h> 23 #include <linux/kernel.h> 24 #include <linux/slab.h> 25 #include <linux/kmod.h> 26 #include <linux/sound.h> 27 #include <linux/interrupt.h> 28 #include <linux/delay.h> 29 #include <linux/mutex.h> 30 #include <linux/dma-mapping.h> 31 #include <linux/pci_ids.h> 32 #include <linux/pm.h> 33 34 #include <media/v4l2-dev.h> 35 #include "tw68.h" 36 #include "tw68-reg.h" 37 38 MODULE_DESCRIPTION("v4l2 driver module for tw6800 based video capture cards"); 39 MODULE_AUTHOR("William M. Brack"); 40 MODULE_AUTHOR("Hans Verkuil <hverkuil@xs4all.nl>"); 41 MODULE_LICENSE("GPL"); 42 43 static unsigned int latency = UNSET; 44 module_param(latency, int, 0444); 45 MODULE_PARM_DESC(latency, "pci latency timer"); 46 47 static unsigned int video_nr[] = {[0 ... (TW68_MAXBOARDS - 1)] = UNSET }; 48 module_param_array(video_nr, int, NULL, 0444); 49 MODULE_PARM_DESC(video_nr, "video device number"); 50 51 static unsigned int card[] = {[0 ... (TW68_MAXBOARDS - 1)] = UNSET }; 52 module_param_array(card, int, NULL, 0444); 53 MODULE_PARM_DESC(card, "card type"); 54 55 static atomic_t tw68_instance = ATOMIC_INIT(0); 56 57 /* ------------------------------------------------------------------ */ 58 59 /* 60 * Please add any new PCI IDs to: http://pci-ids.ucw.cz. This keeps 61 * the PCI ID database up to date. Note that the entries must be 62 * added under vendor 0x1797 (Techwell Inc.) as subsystem IDs. 63 */ 64 static const struct pci_device_id tw68_pci_tbl[] = { 65 {PCI_DEVICE(PCI_VENDOR_ID_TECHWELL, PCI_DEVICE_ID_TECHWELL_6800)}, 66 {PCI_DEVICE(PCI_VENDOR_ID_TECHWELL, PCI_DEVICE_ID_TECHWELL_6801)}, 67 {PCI_DEVICE(PCI_VENDOR_ID_TECHWELL, PCI_DEVICE_ID_TECHWELL_6804)}, 68 {PCI_DEVICE(PCI_VENDOR_ID_TECHWELL, PCI_DEVICE_ID_TECHWELL_6816_1)}, 69 {PCI_DEVICE(PCI_VENDOR_ID_TECHWELL, PCI_DEVICE_ID_TECHWELL_6816_2)}, 70 {PCI_DEVICE(PCI_VENDOR_ID_TECHWELL, PCI_DEVICE_ID_TECHWELL_6816_3)}, 71 {PCI_DEVICE(PCI_VENDOR_ID_TECHWELL, PCI_DEVICE_ID_TECHWELL_6816_4)}, 72 {0,} 73 }; 74 75 /* ------------------------------------------------------------------ */ 76 77 78 /* 79 * The device is given a "soft reset". According to the specifications, 80 * after this "all register content remain unchanged", so we also write 81 * to all specified registers manually as well (mostly to manufacturer's 82 * specified reset values) 83 */ 84 static int tw68_hw_init1(struct tw68_dev *dev) 85 { 86 /* Assure all interrupts are disabled */ 87 tw_writel(TW68_INTMASK, 0); /* 020 */ 88 /* Clear any pending interrupts */ 89 tw_writel(TW68_INTSTAT, 0xffffffff); /* 01C */ 90 /* Stop risc processor, set default buffer level */ 91 tw_writel(TW68_DMAC, 0x1600); 92 93 tw_writeb(TW68_ACNTL, 0x80); /* 218 soft reset */ 94 msleep(100); 95 96 tw_writeb(TW68_INFORM, 0x40); /* 208 mux0, 27mhz xtal */ 97 tw_writeb(TW68_OPFORM, 0x04); /* 20C analog line-lock */ 98 tw_writeb(TW68_HSYNC, 0); /* 210 color-killer high sens */ 99 tw_writeb(TW68_ACNTL, 0x42); /* 218 int vref #2, chroma adc off */ 100 101 tw_writeb(TW68_CROP_HI, 0x02); /* 21C Hactive m.s. bits */ 102 tw_writeb(TW68_VDELAY_LO, 0x12);/* 220 Mfg specified reset value */ 103 tw_writeb(TW68_VACTIVE_LO, 0xf0); 104 tw_writeb(TW68_HDELAY_LO, 0x0f); 105 tw_writeb(TW68_HACTIVE_LO, 0xd0); 106 107 tw_writeb(TW68_CNTRL1, 0xcd); /* 230 Wide Chroma BPF B/W 108 * Secam reduction, Adap comb for 109 * NTSC, Op Mode 1 */ 110 111 tw_writeb(TW68_VSCALE_LO, 0); /* 234 */ 112 tw_writeb(TW68_SCALE_HI, 0x11); /* 238 */ 113 tw_writeb(TW68_HSCALE_LO, 0); /* 23c */ 114 tw_writeb(TW68_BRIGHT, 0); /* 240 */ 115 tw_writeb(TW68_CONTRAST, 0x5c); /* 244 */ 116 tw_writeb(TW68_SHARPNESS, 0x51);/* 248 */ 117 tw_writeb(TW68_SAT_U, 0x80); /* 24C */ 118 tw_writeb(TW68_SAT_V, 0x80); /* 250 */ 119 tw_writeb(TW68_HUE, 0x00); /* 254 */ 120 121 /* TODO - Check that none of these are set by control defaults */ 122 tw_writeb(TW68_SHARP2, 0x53); /* 258 Mfg specified reset val */ 123 tw_writeb(TW68_VSHARP, 0x80); /* 25C Sharpness Coring val 8 */ 124 tw_writeb(TW68_CORING, 0x44); /* 260 CTI and Vert Peak coring */ 125 tw_writeb(TW68_CNTRL2, 0x00); /* 268 No power saving enabled */ 126 tw_writeb(TW68_SDT, 0x07); /* 270 Enable shadow reg, auto-det */ 127 tw_writeb(TW68_SDTR, 0x7f); /* 274 All stds recog, don't start */ 128 tw_writeb(TW68_CLMPG, 0x50); /* 280 Clamp end at 40 sys clocks */ 129 tw_writeb(TW68_IAGC, 0x22); /* 284 Mfg specified reset val */ 130 tw_writeb(TW68_AGCGAIN, 0xf0); /* 288 AGC gain when loop disabled */ 131 tw_writeb(TW68_PEAKWT, 0xd8); /* 28C White peak threshold */ 132 tw_writeb(TW68_CLMPL, 0x3c); /* 290 Y channel clamp level */ 133 /* tw_writeb(TW68_SYNCT, 0x38);*/ /* 294 Sync amplitude */ 134 tw_writeb(TW68_SYNCT, 0x30); /* 294 Sync amplitude */ 135 tw_writeb(TW68_MISSCNT, 0x44); /* 298 Horiz sync, VCR detect sens */ 136 tw_writeb(TW68_PCLAMP, 0x28); /* 29C Clamp pos from PLL sync */ 137 /* Bit DETV of VCNTL1 helps sync multi cams/chip board */ 138 tw_writeb(TW68_VCNTL1, 0x04); /* 2A0 */ 139 tw_writeb(TW68_VCNTL2, 0); /* 2A4 */ 140 tw_writeb(TW68_CKILL, 0x68); /* 2A8 Mfg specified reset val */ 141 tw_writeb(TW68_COMB, 0x44); /* 2AC Mfg specified reset val */ 142 tw_writeb(TW68_LDLY, 0x30); /* 2B0 Max positive luma delay */ 143 tw_writeb(TW68_MISC1, 0x14); /* 2B4 Mfg specified reset val */ 144 tw_writeb(TW68_LOOP, 0xa5); /* 2B8 Mfg specified reset val */ 145 tw_writeb(TW68_MISC2, 0xe0); /* 2BC Enable colour killer */ 146 tw_writeb(TW68_MVSN, 0); /* 2C0 */ 147 tw_writeb(TW68_CLMD, 0x05); /* 2CC slice level auto, clamp med. */ 148 tw_writeb(TW68_IDCNTL, 0); /* 2D0 Writing zero to this register 149 * selects NTSC ID detection, 150 * but doesn't change the 151 * sensitivity (which has a reset 152 * value of 1E). Since we are 153 * not doing auto-detection, it 154 * has no real effect */ 155 tw_writeb(TW68_CLCNTL1, 0); /* 2D4 */ 156 tw_writel(TW68_VBIC, 0x03); /* 010 */ 157 tw_writel(TW68_CAP_CTL, 0x03); /* 040 Enable both even & odd flds */ 158 tw_writel(TW68_DMAC, 0x2000); /* patch set had 0x2080 */ 159 tw_writel(TW68_TESTREG, 0); /* 02C */ 160 161 /* 162 * Some common boards, especially inexpensive single-chip models, 163 * use the GPIO bits 0-3 to control an on-board video-output mux. 164 * For these boards, we need to set up the GPIO register into 165 * "normal" mode, set bits 0-3 as output, and then set those bits 166 * zero. 167 * 168 * Eventually, it would be nice if we could identify these boards 169 * uniquely, and only do this initialisation if the board has been 170 * identify. For the moment, however, it shouldn't hurt anything 171 * to do these steps. 172 */ 173 tw_writel(TW68_GPIOC, 0); /* Set the GPIO to "normal", no ints */ 174 tw_writel(TW68_GPOE, 0x0f); /* Set bits 0-3 to "output" */ 175 tw_writel(TW68_GPDATA, 0); /* Set all bits to low state */ 176 177 /* Initialize the device control structures */ 178 mutex_init(&dev->lock); 179 spin_lock_init(&dev->slock); 180 181 /* Initialize any subsystems */ 182 tw68_video_init1(dev); 183 return 0; 184 } 185 186 static irqreturn_t tw68_irq(int irq, void *dev_id) 187 { 188 struct tw68_dev *dev = dev_id; 189 u32 status, orig; 190 int loop; 191 192 status = orig = tw_readl(TW68_INTSTAT) & dev->pci_irqmask; 193 /* Check if anything to do */ 194 if (0 == status) 195 return IRQ_NONE; /* Nope - return */ 196 for (loop = 0; loop < 10; loop++) { 197 if (status & dev->board_virqmask) /* video interrupt */ 198 tw68_irq_video_done(dev, status); 199 status = tw_readl(TW68_INTSTAT) & dev->pci_irqmask; 200 if (0 == status) 201 return IRQ_HANDLED; 202 } 203 dev_dbg(&dev->pci->dev, "%s: **** INTERRUPT NOT HANDLED - clearing mask (orig 0x%08x, cur 0x%08x)", 204 dev->name, orig, tw_readl(TW68_INTSTAT)); 205 dev_dbg(&dev->pci->dev, "%s: pci_irqmask 0x%08x; board_virqmask 0x%08x ****\n", 206 dev->name, dev->pci_irqmask, dev->board_virqmask); 207 tw_clearl(TW68_INTMASK, dev->pci_irqmask); 208 return IRQ_HANDLED; 209 } 210 211 static int tw68_initdev(struct pci_dev *pci_dev, 212 const struct pci_device_id *pci_id) 213 { 214 struct tw68_dev *dev; 215 int vidnr = -1; 216 int err; 217 218 dev = devm_kzalloc(&pci_dev->dev, sizeof(*dev), GFP_KERNEL); 219 if (NULL == dev) 220 return -ENOMEM; 221 222 dev->instance = v4l2_device_set_name(&dev->v4l2_dev, "tw68", 223 &tw68_instance); 224 225 err = v4l2_device_register(&pci_dev->dev, &dev->v4l2_dev); 226 if (err) 227 return err; 228 229 /* pci init */ 230 dev->pci = pci_dev; 231 if (pci_enable_device(pci_dev)) { 232 err = -EIO; 233 goto fail1; 234 } 235 236 dev->name = dev->v4l2_dev.name; 237 238 if (UNSET != latency) { 239 pr_info("%s: setting pci latency timer to %d\n", 240 dev->name, latency); 241 pci_write_config_byte(pci_dev, PCI_LATENCY_TIMER, latency); 242 } 243 244 /* print pci info */ 245 pci_read_config_byte(pci_dev, PCI_CLASS_REVISION, &dev->pci_rev); 246 pci_read_config_byte(pci_dev, PCI_LATENCY_TIMER, &dev->pci_lat); 247 pr_info("%s: found at %s, rev: %d, irq: %d, latency: %d, mmio: 0x%llx\n", 248 dev->name, pci_name(pci_dev), dev->pci_rev, pci_dev->irq, 249 dev->pci_lat, (u64)pci_resource_start(pci_dev, 0)); 250 pci_set_master(pci_dev); 251 err = pci_set_dma_mask(pci_dev, DMA_BIT_MASK(32)); 252 if (err) { 253 pr_info("%s: Oops: no 32bit PCI DMA ???\n", dev->name); 254 goto fail1; 255 } 256 257 switch (pci_id->device) { 258 case PCI_DEVICE_ID_TECHWELL_6800: /* TW6800 */ 259 dev->vdecoder = TW6800; 260 dev->board_virqmask = TW68_VID_INTS; 261 break; 262 case PCI_DEVICE_ID_TECHWELL_6801: /* Video decoder for TW6802 */ 263 dev->vdecoder = TW6801; 264 dev->board_virqmask = TW68_VID_INTS | TW68_VID_INTSX; 265 break; 266 case PCI_DEVICE_ID_TECHWELL_6804: /* Video decoder for TW6804 */ 267 dev->vdecoder = TW6804; 268 dev->board_virqmask = TW68_VID_INTS | TW68_VID_INTSX; 269 break; 270 default: 271 dev->vdecoder = TWXXXX; /* To be announced */ 272 dev->board_virqmask = TW68_VID_INTS | TW68_VID_INTSX; 273 break; 274 } 275 276 /* get mmio */ 277 if (!request_mem_region(pci_resource_start(pci_dev, 0), 278 pci_resource_len(pci_dev, 0), 279 dev->name)) { 280 err = -EBUSY; 281 pr_err("%s: can't get MMIO memory @ 0x%llx\n", 282 dev->name, 283 (unsigned long long)pci_resource_start(pci_dev, 0)); 284 goto fail1; 285 } 286 dev->lmmio = ioremap(pci_resource_start(pci_dev, 0), 287 pci_resource_len(pci_dev, 0)); 288 dev->bmmio = (__u8 __iomem *)dev->lmmio; 289 if (NULL == dev->lmmio) { 290 err = -EIO; 291 pr_err("%s: can't ioremap() MMIO memory\n", 292 dev->name); 293 goto fail2; 294 } 295 /* initialize hardware #1 */ 296 /* Then do any initialisation wanted before interrupts are on */ 297 tw68_hw_init1(dev); 298 299 /* get irq */ 300 err = devm_request_irq(&pci_dev->dev, pci_dev->irq, tw68_irq, 301 IRQF_SHARED, dev->name, dev); 302 if (err < 0) { 303 pr_err("%s: can't get IRQ %d\n", 304 dev->name, pci_dev->irq); 305 goto fail3; 306 } 307 308 /* 309 * Now do remainder of initialisation, first for 310 * things unique for this card, then for general board 311 */ 312 if (dev->instance < TW68_MAXBOARDS) 313 vidnr = video_nr[dev->instance]; 314 /* initialise video function first */ 315 err = tw68_video_init2(dev, vidnr); 316 if (err < 0) { 317 pr_err("%s: can't register video device\n", 318 dev->name); 319 goto fail4; 320 } 321 tw_setl(TW68_INTMASK, dev->pci_irqmask); 322 323 pr_info("%s: registered device %s\n", 324 dev->name, video_device_node_name(&dev->vdev)); 325 326 return 0; 327 328 fail4: 329 video_unregister_device(&dev->vdev); 330 fail3: 331 iounmap(dev->lmmio); 332 fail2: 333 release_mem_region(pci_resource_start(pci_dev, 0), 334 pci_resource_len(pci_dev, 0)); 335 fail1: 336 v4l2_device_unregister(&dev->v4l2_dev); 337 return err; 338 } 339 340 static void tw68_finidev(struct pci_dev *pci_dev) 341 { 342 struct v4l2_device *v4l2_dev = pci_get_drvdata(pci_dev); 343 struct tw68_dev *dev = 344 container_of(v4l2_dev, struct tw68_dev, v4l2_dev); 345 346 /* shutdown subsystems */ 347 tw_clearl(TW68_DMAC, TW68_DMAP_EN | TW68_FIFO_EN); 348 tw_writel(TW68_INTMASK, 0); 349 350 /* unregister */ 351 video_unregister_device(&dev->vdev); 352 v4l2_ctrl_handler_free(&dev->hdl); 353 354 /* release resources */ 355 iounmap(dev->lmmio); 356 release_mem_region(pci_resource_start(pci_dev, 0), 357 pci_resource_len(pci_dev, 0)); 358 359 v4l2_device_unregister(&dev->v4l2_dev); 360 } 361 362 #ifdef CONFIG_PM 363 364 static int tw68_suspend(struct pci_dev *pci_dev , pm_message_t state) 365 { 366 struct v4l2_device *v4l2_dev = pci_get_drvdata(pci_dev); 367 struct tw68_dev *dev = container_of(v4l2_dev, 368 struct tw68_dev, v4l2_dev); 369 370 tw_clearl(TW68_DMAC, TW68_DMAP_EN | TW68_FIFO_EN); 371 dev->pci_irqmask &= ~TW68_VID_INTS; 372 tw_writel(TW68_INTMASK, 0); 373 374 synchronize_irq(pci_dev->irq); 375 376 pci_save_state(pci_dev); 377 pci_set_power_state(pci_dev, pci_choose_state(pci_dev, state)); 378 vb2_discard_done(&dev->vidq); 379 380 return 0; 381 } 382 383 static int tw68_resume(struct pci_dev *pci_dev) 384 { 385 struct v4l2_device *v4l2_dev = pci_get_drvdata(pci_dev); 386 struct tw68_dev *dev = container_of(v4l2_dev, 387 struct tw68_dev, v4l2_dev); 388 struct tw68_buf *buf; 389 unsigned long flags; 390 391 pci_set_power_state(pci_dev, PCI_D0); 392 pci_restore_state(pci_dev); 393 394 /* Do things that are done in tw68_initdev , 395 except of initializing memory structures.*/ 396 397 msleep(100); 398 399 tw68_set_tvnorm_hw(dev); 400 401 /*resume unfinished buffer(s)*/ 402 spin_lock_irqsave(&dev->slock, flags); 403 buf = container_of(dev->active.next, struct tw68_buf, list); 404 405 tw68_video_start_dma(dev, buf); 406 407 spin_unlock_irqrestore(&dev->slock, flags); 408 409 return 0; 410 } 411 #endif 412 413 /* ----------------------------------------------------------- */ 414 415 static struct pci_driver tw68_pci_driver = { 416 .name = "tw68", 417 .id_table = tw68_pci_tbl, 418 .probe = tw68_initdev, 419 .remove = tw68_finidev, 420 #ifdef CONFIG_PM 421 .suspend = tw68_suspend, 422 .resume = tw68_resume 423 #endif 424 }; 425 426 module_pci_driver(tw68_pci_driver); 427