1/* 2 * Copyright (c) 2011 Atmel Corporation 3 * Josh Wu, <josh.wu@atmel.com> 4 * 5 * Based on previous work by Lars Haring, <lars.haring@atmel.com> 6 * and Sedji Gaouaou 7 * Based on the bttv driver for Bt848 with respective copyright holders 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License version 2 as 11 * published by the Free Software Foundation. 12 */ 13 14#include <linux/clk.h> 15#include <linux/completion.h> 16#include <linux/delay.h> 17#include <linux/fs.h> 18#include <linux/init.h> 19#include <linux/interrupt.h> 20#include <linux/kernel.h> 21#include <linux/module.h> 22#include <linux/platform_device.h> 23#include <linux/slab.h> 24 25#include <media/atmel-isi.h> 26#include <media/soc_camera.h> 27#include <media/soc_mediabus.h> 28#include <media/v4l2-of.h> 29#include <media/videobuf2-dma-contig.h> 30 31#define MAX_BUFFER_NUM 32 32#define MAX_SUPPORT_WIDTH 2048 33#define MAX_SUPPORT_HEIGHT 2048 34#define VID_LIMIT_BYTES (16 * 1024 * 1024) 35#define MIN_FRAME_RATE 15 36#define FRAME_INTERVAL_MILLI_SEC (1000 / MIN_FRAME_RATE) 37#define ISI_DEFAULT_MCLK_FREQ 25000000 38 39/* Frame buffer descriptor */ 40struct fbd { 41 /* Physical address of the frame buffer */ 42 u32 fb_address; 43 /* DMA Control Register(only in HISI2) */ 44 u32 dma_ctrl; 45 /* Physical address of the next fbd */ 46 u32 next_fbd_address; 47}; 48 49static void set_dma_ctrl(struct fbd *fb_desc, u32 ctrl) 50{ 51 fb_desc->dma_ctrl = ctrl; 52} 53 54struct isi_dma_desc { 55 struct list_head list; 56 struct fbd *p_fbd; 57 dma_addr_t fbd_phys; 58}; 59 60/* Frame buffer data */ 61struct frame_buffer { 62 struct vb2_buffer vb; 63 struct isi_dma_desc *p_dma_desc; 64 struct list_head list; 65}; 66 67struct atmel_isi { 68 /* Protects the access of variables shared with the ISR */ 69 spinlock_t lock; 70 void __iomem *regs; 71 72 int sequence; 73 74 struct vb2_alloc_ctx *alloc_ctx; 75 76 /* Allocate descriptors for dma buffer use */ 77 struct fbd *p_fb_descriptors; 78 dma_addr_t fb_descriptors_phys; 79 struct list_head dma_desc_head; 80 struct isi_dma_desc dma_desc[MAX_BUFFER_NUM]; 81 82 struct completion complete; 83 /* ISI peripherial clock */ 84 struct clk *pclk; 85 /* ISI_MCK, feed to camera sensor to generate pixel clock */ 86 struct clk *mck; 87 unsigned int irq; 88 89 struct isi_platform_data pdata; 90 u16 width_flags; /* max 12 bits */ 91 92 struct list_head video_buffer_list; 93 struct frame_buffer *active; 94 95 struct soc_camera_host soc_host; 96}; 97 98static void isi_writel(struct atmel_isi *isi, u32 reg, u32 val) 99{ 100 writel(val, isi->regs + reg); 101} 102static u32 isi_readl(struct atmel_isi *isi, u32 reg) 103{ 104 return readl(isi->regs + reg); 105} 106 107static int configure_geometry(struct atmel_isi *isi, u32 width, 108 u32 height, u32 code) 109{ 110 u32 cfg2, cr; 111 112 switch (code) { 113 /* YUV, including grey */ 114 case MEDIA_BUS_FMT_Y8_1X8: 115 cr = ISI_CFG2_GRAYSCALE; 116 break; 117 case MEDIA_BUS_FMT_VYUY8_2X8: 118 cr = ISI_CFG2_YCC_SWAP_MODE_3; 119 break; 120 case MEDIA_BUS_FMT_UYVY8_2X8: 121 cr = ISI_CFG2_YCC_SWAP_MODE_2; 122 break; 123 case MEDIA_BUS_FMT_YVYU8_2X8: 124 cr = ISI_CFG2_YCC_SWAP_MODE_1; 125 break; 126 case MEDIA_BUS_FMT_YUYV8_2X8: 127 cr = ISI_CFG2_YCC_SWAP_DEFAULT; 128 break; 129 /* RGB, TODO */ 130 default: 131 return -EINVAL; 132 } 133 134 isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS); 135 136 cfg2 = isi_readl(isi, ISI_CFG2); 137 /* Set YCC swap mode */ 138 cfg2 &= ~ISI_CFG2_YCC_SWAP_MODE_MASK; 139 cfg2 |= cr; 140 /* Set width */ 141 cfg2 &= ~(ISI_CFG2_IM_HSIZE_MASK); 142 cfg2 |= ((width - 1) << ISI_CFG2_IM_HSIZE_OFFSET) & 143 ISI_CFG2_IM_HSIZE_MASK; 144 /* Set height */ 145 cfg2 &= ~(ISI_CFG2_IM_VSIZE_MASK); 146 cfg2 |= ((height - 1) << ISI_CFG2_IM_VSIZE_OFFSET) 147 & ISI_CFG2_IM_VSIZE_MASK; 148 isi_writel(isi, ISI_CFG2, cfg2); 149 150 return 0; 151} 152 153static irqreturn_t atmel_isi_handle_streaming(struct atmel_isi *isi) 154{ 155 if (isi->active) { 156 struct vb2_buffer *vb = &isi->active->vb; 157 struct frame_buffer *buf = isi->active; 158 159 list_del_init(&buf->list); 160 v4l2_get_timestamp(&vb->v4l2_buf.timestamp); 161 vb->v4l2_buf.sequence = isi->sequence++; 162 vb2_buffer_done(vb, VB2_BUF_STATE_DONE); 163 } 164 165 if (list_empty(&isi->video_buffer_list)) { 166 isi->active = NULL; 167 } else { 168 /* start next dma frame. */ 169 isi->active = list_entry(isi->video_buffer_list.next, 170 struct frame_buffer, list); 171 isi_writel(isi, ISI_DMA_C_DSCR, 172 (u32)isi->active->p_dma_desc->fbd_phys); 173 isi_writel(isi, ISI_DMA_C_CTRL, 174 ISI_DMA_CTRL_FETCH | ISI_DMA_CTRL_DONE); 175 isi_writel(isi, ISI_DMA_CHER, ISI_DMA_CHSR_C_CH); 176 } 177 return IRQ_HANDLED; 178} 179 180/* ISI interrupt service routine */ 181static irqreturn_t isi_interrupt(int irq, void *dev_id) 182{ 183 struct atmel_isi *isi = dev_id; 184 u32 status, mask, pending; 185 irqreturn_t ret = IRQ_NONE; 186 187 spin_lock(&isi->lock); 188 189 status = isi_readl(isi, ISI_STATUS); 190 mask = isi_readl(isi, ISI_INTMASK); 191 pending = status & mask; 192 193 if (pending & ISI_CTRL_SRST) { 194 complete(&isi->complete); 195 isi_writel(isi, ISI_INTDIS, ISI_CTRL_SRST); 196 ret = IRQ_HANDLED; 197 } else if (pending & ISI_CTRL_DIS) { 198 complete(&isi->complete); 199 isi_writel(isi, ISI_INTDIS, ISI_CTRL_DIS); 200 ret = IRQ_HANDLED; 201 } else { 202 if (likely(pending & ISI_SR_CXFR_DONE)) 203 ret = atmel_isi_handle_streaming(isi); 204 } 205 206 spin_unlock(&isi->lock); 207 return ret; 208} 209 210#define WAIT_ISI_RESET 1 211#define WAIT_ISI_DISABLE 0 212static int atmel_isi_wait_status(struct atmel_isi *isi, int wait_reset) 213{ 214 unsigned long timeout; 215 /* 216 * The reset or disable will only succeed if we have a 217 * pixel clock from the camera. 218 */ 219 init_completion(&isi->complete); 220 221 if (wait_reset) { 222 isi_writel(isi, ISI_INTEN, ISI_CTRL_SRST); 223 isi_writel(isi, ISI_CTRL, ISI_CTRL_SRST); 224 } else { 225 isi_writel(isi, ISI_INTEN, ISI_CTRL_DIS); 226 isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS); 227 } 228 229 timeout = wait_for_completion_timeout(&isi->complete, 230 msecs_to_jiffies(100)); 231 if (timeout == 0) 232 return -ETIMEDOUT; 233 234 return 0; 235} 236 237/* ------------------------------------------------------------------ 238 Videobuf operations 239 ------------------------------------------------------------------*/ 240static int queue_setup(struct vb2_queue *vq, const struct v4l2_format *fmt, 241 unsigned int *nbuffers, unsigned int *nplanes, 242 unsigned int sizes[], void *alloc_ctxs[]) 243{ 244 struct soc_camera_device *icd = soc_camera_from_vb2q(vq); 245 struct soc_camera_host *ici = to_soc_camera_host(icd->parent); 246 struct atmel_isi *isi = ici->priv; 247 unsigned long size; 248 249 size = icd->sizeimage; 250 251 if (!*nbuffers || *nbuffers > MAX_BUFFER_NUM) 252 *nbuffers = MAX_BUFFER_NUM; 253 254 if (size * *nbuffers > VID_LIMIT_BYTES) 255 *nbuffers = VID_LIMIT_BYTES / size; 256 257 *nplanes = 1; 258 sizes[0] = size; 259 alloc_ctxs[0] = isi->alloc_ctx; 260 261 isi->sequence = 0; 262 isi->active = NULL; 263 264 dev_dbg(icd->parent, "%s, count=%d, size=%ld\n", __func__, 265 *nbuffers, size); 266 267 return 0; 268} 269 270static int buffer_init(struct vb2_buffer *vb) 271{ 272 struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb); 273 274 buf->p_dma_desc = NULL; 275 INIT_LIST_HEAD(&buf->list); 276 277 return 0; 278} 279 280static int buffer_prepare(struct vb2_buffer *vb) 281{ 282 struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue); 283 struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb); 284 struct soc_camera_host *ici = to_soc_camera_host(icd->parent); 285 struct atmel_isi *isi = ici->priv; 286 unsigned long size; 287 struct isi_dma_desc *desc; 288 289 size = icd->sizeimage; 290 291 if (vb2_plane_size(vb, 0) < size) { 292 dev_err(icd->parent, "%s data will not fit into plane (%lu < %lu)\n", 293 __func__, vb2_plane_size(vb, 0), size); 294 return -EINVAL; 295 } 296 297 vb2_set_plane_payload(&buf->vb, 0, size); 298 299 if (!buf->p_dma_desc) { 300 if (list_empty(&isi->dma_desc_head)) { 301 dev_err(icd->parent, "Not enough dma descriptors.\n"); 302 return -EINVAL; 303 } else { 304 /* Get an available descriptor */ 305 desc = list_entry(isi->dma_desc_head.next, 306 struct isi_dma_desc, list); 307 /* Delete the descriptor since now it is used */ 308 list_del_init(&desc->list); 309 310 /* Initialize the dma descriptor */ 311 desc->p_fbd->fb_address = 312 vb2_dma_contig_plane_dma_addr(vb, 0); 313 desc->p_fbd->next_fbd_address = 0; 314 set_dma_ctrl(desc->p_fbd, ISI_DMA_CTRL_WB); 315 316 buf->p_dma_desc = desc; 317 } 318 } 319 return 0; 320} 321 322static void buffer_cleanup(struct vb2_buffer *vb) 323{ 324 struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue); 325 struct soc_camera_host *ici = to_soc_camera_host(icd->parent); 326 struct atmel_isi *isi = ici->priv; 327 struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb); 328 329 /* This descriptor is available now and we add to head list */ 330 if (buf->p_dma_desc) 331 list_add(&buf->p_dma_desc->list, &isi->dma_desc_head); 332} 333 334static void start_dma(struct atmel_isi *isi, struct frame_buffer *buffer) 335{ 336 u32 ctrl, cfg1; 337 338 cfg1 = isi_readl(isi, ISI_CFG1); 339 /* Enable irq: cxfr for the codec path, pxfr for the preview path */ 340 isi_writel(isi, ISI_INTEN, 341 ISI_SR_CXFR_DONE | ISI_SR_PXFR_DONE); 342 343 /* Check if already in a frame */ 344 if (isi_readl(isi, ISI_STATUS) & ISI_CTRL_CDC) { 345 dev_err(isi->soc_host.icd->parent, "Already in frame handling.\n"); 346 return; 347 } 348 349 isi_writel(isi, ISI_DMA_C_DSCR, (u32)buffer->p_dma_desc->fbd_phys); 350 isi_writel(isi, ISI_DMA_C_CTRL, ISI_DMA_CTRL_FETCH | ISI_DMA_CTRL_DONE); 351 isi_writel(isi, ISI_DMA_CHER, ISI_DMA_CHSR_C_CH); 352 353 cfg1 &= ~ISI_CFG1_FRATE_DIV_MASK; 354 /* Enable linked list */ 355 cfg1 |= isi->pdata.frate | ISI_CFG1_DISCR; 356 357 /* Enable codec path and ISI */ 358 ctrl = ISI_CTRL_CDC | ISI_CTRL_EN; 359 isi_writel(isi, ISI_CTRL, ctrl); 360 isi_writel(isi, ISI_CFG1, cfg1); 361} 362 363static void buffer_queue(struct vb2_buffer *vb) 364{ 365 struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue); 366 struct soc_camera_host *ici = to_soc_camera_host(icd->parent); 367 struct atmel_isi *isi = ici->priv; 368 struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb); 369 unsigned long flags = 0; 370 371 spin_lock_irqsave(&isi->lock, flags); 372 list_add_tail(&buf->list, &isi->video_buffer_list); 373 374 if (isi->active == NULL) { 375 isi->active = buf; 376 if (vb2_is_streaming(vb->vb2_queue)) 377 start_dma(isi, buf); 378 } 379 spin_unlock_irqrestore(&isi->lock, flags); 380} 381 382static int start_streaming(struct vb2_queue *vq, unsigned int count) 383{ 384 struct soc_camera_device *icd = soc_camera_from_vb2q(vq); 385 struct soc_camera_host *ici = to_soc_camera_host(icd->parent); 386 struct atmel_isi *isi = ici->priv; 387 int ret; 388 389 /* Reset ISI */ 390 ret = atmel_isi_wait_status(isi, WAIT_ISI_RESET); 391 if (ret < 0) { 392 dev_err(icd->parent, "Reset ISI timed out\n"); 393 return ret; 394 } 395 /* Disable all interrupts */ 396 isi_writel(isi, ISI_INTDIS, (u32)~0UL); 397 398 spin_lock_irq(&isi->lock); 399 /* Clear any pending interrupt */ 400 isi_readl(isi, ISI_STATUS); 401 402 if (count) 403 start_dma(isi, isi->active); 404 spin_unlock_irq(&isi->lock); 405 406 return 0; 407} 408 409/* abort streaming and wait for last buffer */ 410static void stop_streaming(struct vb2_queue *vq) 411{ 412 struct soc_camera_device *icd = soc_camera_from_vb2q(vq); 413 struct soc_camera_host *ici = to_soc_camera_host(icd->parent); 414 struct atmel_isi *isi = ici->priv; 415 struct frame_buffer *buf, *node; 416 int ret = 0; 417 unsigned long timeout; 418 419 spin_lock_irq(&isi->lock); 420 isi->active = NULL; 421 /* Release all active buffers */ 422 list_for_each_entry_safe(buf, node, &isi->video_buffer_list, list) { 423 list_del_init(&buf->list); 424 vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR); 425 } 426 spin_unlock_irq(&isi->lock); 427 428 timeout = jiffies + FRAME_INTERVAL_MILLI_SEC * HZ; 429 /* Wait until the end of the current frame. */ 430 while ((isi_readl(isi, ISI_STATUS) & ISI_CTRL_CDC) && 431 time_before(jiffies, timeout)) 432 msleep(1); 433 434 if (time_after(jiffies, timeout)) { 435 dev_err(icd->parent, 436 "Timeout waiting for finishing codec request\n"); 437 return; 438 } 439 440 /* Disable interrupts */ 441 isi_writel(isi, ISI_INTDIS, 442 ISI_SR_CXFR_DONE | ISI_SR_PXFR_DONE); 443 444 /* Disable ISI and wait for it is done */ 445 ret = atmel_isi_wait_status(isi, WAIT_ISI_DISABLE); 446 if (ret < 0) 447 dev_err(icd->parent, "Disable ISI timed out\n"); 448} 449 450static struct vb2_ops isi_video_qops = { 451 .queue_setup = queue_setup, 452 .buf_init = buffer_init, 453 .buf_prepare = buffer_prepare, 454 .buf_cleanup = buffer_cleanup, 455 .buf_queue = buffer_queue, 456 .start_streaming = start_streaming, 457 .stop_streaming = stop_streaming, 458 .wait_prepare = vb2_ops_wait_prepare, 459 .wait_finish = vb2_ops_wait_finish, 460}; 461 462/* ------------------------------------------------------------------ 463 SOC camera operations for the device 464 ------------------------------------------------------------------*/ 465static int isi_camera_init_videobuf(struct vb2_queue *q, 466 struct soc_camera_device *icd) 467{ 468 struct soc_camera_host *ici = to_soc_camera_host(icd->parent); 469 470 q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; 471 q->io_modes = VB2_MMAP; 472 q->drv_priv = icd; 473 q->buf_struct_size = sizeof(struct frame_buffer); 474 q->ops = &isi_video_qops; 475 q->mem_ops = &vb2_dma_contig_memops; 476 q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC; 477 q->lock = &ici->host_lock; 478 479 return vb2_queue_init(q); 480} 481 482static int isi_camera_set_fmt(struct soc_camera_device *icd, 483 struct v4l2_format *f) 484{ 485 struct soc_camera_host *ici = to_soc_camera_host(icd->parent); 486 struct atmel_isi *isi = ici->priv; 487 struct v4l2_subdev *sd = soc_camera_to_subdev(icd); 488 const struct soc_camera_format_xlate *xlate; 489 struct v4l2_pix_format *pix = &f->fmt.pix; 490 struct v4l2_mbus_framefmt mf; 491 int ret; 492 493 xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat); 494 if (!xlate) { 495 dev_warn(icd->parent, "Format %x not found\n", 496 pix->pixelformat); 497 return -EINVAL; 498 } 499 500 dev_dbg(icd->parent, "Plan to set format %dx%d\n", 501 pix->width, pix->height); 502 503 mf.width = pix->width; 504 mf.height = pix->height; 505 mf.field = pix->field; 506 mf.colorspace = pix->colorspace; 507 mf.code = xlate->code; 508 509 ret = v4l2_subdev_call(sd, video, s_mbus_fmt, &mf); 510 if (ret < 0) 511 return ret; 512 513 if (mf.code != xlate->code) 514 return -EINVAL; 515 516 ret = configure_geometry(isi, pix->width, pix->height, xlate->code); 517 if (ret < 0) 518 return ret; 519 520 pix->width = mf.width; 521 pix->height = mf.height; 522 pix->field = mf.field; 523 pix->colorspace = mf.colorspace; 524 icd->current_fmt = xlate; 525 526 dev_dbg(icd->parent, "Finally set format %dx%d\n", 527 pix->width, pix->height); 528 529 return ret; 530} 531 532static int isi_camera_try_fmt(struct soc_camera_device *icd, 533 struct v4l2_format *f) 534{ 535 struct v4l2_subdev *sd = soc_camera_to_subdev(icd); 536 const struct soc_camera_format_xlate *xlate; 537 struct v4l2_pix_format *pix = &f->fmt.pix; 538 struct v4l2_mbus_framefmt mf; 539 u32 pixfmt = pix->pixelformat; 540 int ret; 541 542 xlate = soc_camera_xlate_by_fourcc(icd, pixfmt); 543 if (pixfmt && !xlate) { 544 dev_warn(icd->parent, "Format %x not found\n", pixfmt); 545 return -EINVAL; 546 } 547 548 /* limit to Atmel ISI hardware capabilities */ 549 if (pix->height > MAX_SUPPORT_HEIGHT) 550 pix->height = MAX_SUPPORT_HEIGHT; 551 if (pix->width > MAX_SUPPORT_WIDTH) 552 pix->width = MAX_SUPPORT_WIDTH; 553 554 /* limit to sensor capabilities */ 555 mf.width = pix->width; 556 mf.height = pix->height; 557 mf.field = pix->field; 558 mf.colorspace = pix->colorspace; 559 mf.code = xlate->code; 560 561 ret = v4l2_subdev_call(sd, video, try_mbus_fmt, &mf); 562 if (ret < 0) 563 return ret; 564 565 pix->width = mf.width; 566 pix->height = mf.height; 567 pix->colorspace = mf.colorspace; 568 569 switch (mf.field) { 570 case V4L2_FIELD_ANY: 571 pix->field = V4L2_FIELD_NONE; 572 break; 573 case V4L2_FIELD_NONE: 574 break; 575 default: 576 dev_err(icd->parent, "Field type %d unsupported.\n", 577 mf.field); 578 ret = -EINVAL; 579 } 580 581 return ret; 582} 583 584static const struct soc_mbus_pixelfmt isi_camera_formats[] = { 585 { 586 .fourcc = V4L2_PIX_FMT_YUYV, 587 .name = "Packed YUV422 16 bit", 588 .bits_per_sample = 8, 589 .packing = SOC_MBUS_PACKING_2X8_PADHI, 590 .order = SOC_MBUS_ORDER_LE, 591 .layout = SOC_MBUS_LAYOUT_PACKED, 592 }, 593}; 594 595/* This will be corrected as we get more formats */ 596static bool isi_camera_packing_supported(const struct soc_mbus_pixelfmt *fmt) 597{ 598 return fmt->packing == SOC_MBUS_PACKING_NONE || 599 (fmt->bits_per_sample == 8 && 600 fmt->packing == SOC_MBUS_PACKING_2X8_PADHI) || 601 (fmt->bits_per_sample > 8 && 602 fmt->packing == SOC_MBUS_PACKING_EXTEND16); 603} 604 605#define ISI_BUS_PARAM (V4L2_MBUS_MASTER | \ 606 V4L2_MBUS_HSYNC_ACTIVE_HIGH | \ 607 V4L2_MBUS_HSYNC_ACTIVE_LOW | \ 608 V4L2_MBUS_VSYNC_ACTIVE_HIGH | \ 609 V4L2_MBUS_VSYNC_ACTIVE_LOW | \ 610 V4L2_MBUS_PCLK_SAMPLE_RISING | \ 611 V4L2_MBUS_PCLK_SAMPLE_FALLING | \ 612 V4L2_MBUS_DATA_ACTIVE_HIGH) 613 614static int isi_camera_try_bus_param(struct soc_camera_device *icd, 615 unsigned char buswidth) 616{ 617 struct v4l2_subdev *sd = soc_camera_to_subdev(icd); 618 struct soc_camera_host *ici = to_soc_camera_host(icd->parent); 619 struct atmel_isi *isi = ici->priv; 620 struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,}; 621 unsigned long common_flags; 622 int ret; 623 624 ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg); 625 if (!ret) { 626 common_flags = soc_mbus_config_compatible(&cfg, 627 ISI_BUS_PARAM); 628 if (!common_flags) { 629 dev_warn(icd->parent, 630 "Flags incompatible: camera 0x%x, host 0x%x\n", 631 cfg.flags, ISI_BUS_PARAM); 632 return -EINVAL; 633 } 634 } else if (ret != -ENOIOCTLCMD) { 635 return ret; 636 } 637 638 if ((1 << (buswidth - 1)) & isi->width_flags) 639 return 0; 640 return -EINVAL; 641} 642 643 644static int isi_camera_get_formats(struct soc_camera_device *icd, 645 unsigned int idx, 646 struct soc_camera_format_xlate *xlate) 647{ 648 struct v4l2_subdev *sd = soc_camera_to_subdev(icd); 649 int formats = 0, ret; 650 /* sensor format */ 651 u32 code; 652 /* soc camera host format */ 653 const struct soc_mbus_pixelfmt *fmt; 654 655 ret = v4l2_subdev_call(sd, video, enum_mbus_fmt, idx, &code); 656 if (ret < 0) 657 /* No more formats */ 658 return 0; 659 660 fmt = soc_mbus_get_fmtdesc(code); 661 if (!fmt) { 662 dev_err(icd->parent, 663 "Invalid format code #%u: %d\n", idx, code); 664 return 0; 665 } 666 667 /* This also checks support for the requested bits-per-sample */ 668 ret = isi_camera_try_bus_param(icd, fmt->bits_per_sample); 669 if (ret < 0) { 670 dev_err(icd->parent, 671 "Fail to try the bus parameters.\n"); 672 return 0; 673 } 674 675 switch (code) { 676 case MEDIA_BUS_FMT_UYVY8_2X8: 677 case MEDIA_BUS_FMT_VYUY8_2X8: 678 case MEDIA_BUS_FMT_YUYV8_2X8: 679 case MEDIA_BUS_FMT_YVYU8_2X8: 680 formats++; 681 if (xlate) { 682 xlate->host_fmt = &isi_camera_formats[0]; 683 xlate->code = code; 684 xlate++; 685 dev_dbg(icd->parent, "Providing format %s using code %d\n", 686 isi_camera_formats[0].name, code); 687 } 688 break; 689 default: 690 if (!isi_camera_packing_supported(fmt)) 691 return 0; 692 if (xlate) 693 dev_dbg(icd->parent, 694 "Providing format %s in pass-through mode\n", 695 fmt->name); 696 } 697 698 /* Generic pass-through */ 699 formats++; 700 if (xlate) { 701 xlate->host_fmt = fmt; 702 xlate->code = code; 703 xlate++; 704 } 705 706 return formats; 707} 708 709static int isi_camera_add_device(struct soc_camera_device *icd) 710{ 711 dev_dbg(icd->parent, "Atmel ISI Camera driver attached to camera %d\n", 712 icd->devnum); 713 714 return 0; 715} 716 717static void isi_camera_remove_device(struct soc_camera_device *icd) 718{ 719 dev_dbg(icd->parent, "Atmel ISI Camera driver detached from camera %d\n", 720 icd->devnum); 721} 722 723/* Called with .host_lock held */ 724static int isi_camera_clock_start(struct soc_camera_host *ici) 725{ 726 struct atmel_isi *isi = ici->priv; 727 int ret; 728 729 ret = clk_prepare_enable(isi->pclk); 730 if (ret) 731 return ret; 732 733 if (!IS_ERR(isi->mck)) { 734 ret = clk_prepare_enable(isi->mck); 735 if (ret) { 736 clk_disable_unprepare(isi->pclk); 737 return ret; 738 } 739 } 740 741 return 0; 742} 743 744/* Called with .host_lock held */ 745static void isi_camera_clock_stop(struct soc_camera_host *ici) 746{ 747 struct atmel_isi *isi = ici->priv; 748 749 if (!IS_ERR(isi->mck)) 750 clk_disable_unprepare(isi->mck); 751 clk_disable_unprepare(isi->pclk); 752} 753 754static unsigned int isi_camera_poll(struct file *file, poll_table *pt) 755{ 756 struct soc_camera_device *icd = file->private_data; 757 758 return vb2_poll(&icd->vb2_vidq, file, pt); 759} 760 761static int isi_camera_querycap(struct soc_camera_host *ici, 762 struct v4l2_capability *cap) 763{ 764 strcpy(cap->driver, "atmel-isi"); 765 strcpy(cap->card, "Atmel Image Sensor Interface"); 766 cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING; 767 cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS; 768 769 return 0; 770} 771 772static int isi_camera_set_bus_param(struct soc_camera_device *icd) 773{ 774 struct v4l2_subdev *sd = soc_camera_to_subdev(icd); 775 struct soc_camera_host *ici = to_soc_camera_host(icd->parent); 776 struct atmel_isi *isi = ici->priv; 777 struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,}; 778 unsigned long common_flags; 779 int ret; 780 u32 cfg1 = 0; 781 782 ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg); 783 if (!ret) { 784 common_flags = soc_mbus_config_compatible(&cfg, 785 ISI_BUS_PARAM); 786 if (!common_flags) { 787 dev_warn(icd->parent, 788 "Flags incompatible: camera 0x%x, host 0x%x\n", 789 cfg.flags, ISI_BUS_PARAM); 790 return -EINVAL; 791 } 792 } else if (ret != -ENOIOCTLCMD) { 793 return ret; 794 } else { 795 common_flags = ISI_BUS_PARAM; 796 } 797 dev_dbg(icd->parent, "Flags cam: 0x%x host: 0x%x common: 0x%lx\n", 798 cfg.flags, ISI_BUS_PARAM, common_flags); 799 800 /* Make choises, based on platform preferences */ 801 if ((common_flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH) && 802 (common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)) { 803 if (isi->pdata.hsync_act_low) 804 common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_HIGH; 805 else 806 common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_LOW; 807 } 808 809 if ((common_flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH) && 810 (common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)) { 811 if (isi->pdata.vsync_act_low) 812 common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_HIGH; 813 else 814 common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_LOW; 815 } 816 817 if ((common_flags & V4L2_MBUS_PCLK_SAMPLE_RISING) && 818 (common_flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)) { 819 if (isi->pdata.pclk_act_falling) 820 common_flags &= ~V4L2_MBUS_PCLK_SAMPLE_RISING; 821 else 822 common_flags &= ~V4L2_MBUS_PCLK_SAMPLE_FALLING; 823 } 824 825 cfg.flags = common_flags; 826 ret = v4l2_subdev_call(sd, video, s_mbus_config, &cfg); 827 if (ret < 0 && ret != -ENOIOCTLCMD) { 828 dev_dbg(icd->parent, "camera s_mbus_config(0x%lx) returned %d\n", 829 common_flags, ret); 830 return ret; 831 } 832 833 /* set bus param for ISI */ 834 if (common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW) 835 cfg1 |= ISI_CFG1_HSYNC_POL_ACTIVE_LOW; 836 if (common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW) 837 cfg1 |= ISI_CFG1_VSYNC_POL_ACTIVE_LOW; 838 if (common_flags & V4L2_MBUS_PCLK_SAMPLE_FALLING) 839 cfg1 |= ISI_CFG1_PIXCLK_POL_ACTIVE_FALLING; 840 841 if (isi->pdata.has_emb_sync) 842 cfg1 |= ISI_CFG1_EMB_SYNC; 843 if (isi->pdata.full_mode) 844 cfg1 |= ISI_CFG1_FULL_MODE; 845 846 cfg1 |= ISI_CFG1_THMASK_BEATS_16; 847 848 isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS); 849 isi_writel(isi, ISI_CFG1, cfg1); 850 851 return 0; 852} 853 854static struct soc_camera_host_ops isi_soc_camera_host_ops = { 855 .owner = THIS_MODULE, 856 .add = isi_camera_add_device, 857 .remove = isi_camera_remove_device, 858 .clock_start = isi_camera_clock_start, 859 .clock_stop = isi_camera_clock_stop, 860 .set_fmt = isi_camera_set_fmt, 861 .try_fmt = isi_camera_try_fmt, 862 .get_formats = isi_camera_get_formats, 863 .init_videobuf2 = isi_camera_init_videobuf, 864 .poll = isi_camera_poll, 865 .querycap = isi_camera_querycap, 866 .set_bus_param = isi_camera_set_bus_param, 867}; 868 869/* -----------------------------------------------------------------------*/ 870static int atmel_isi_remove(struct platform_device *pdev) 871{ 872 struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev); 873 struct atmel_isi *isi = container_of(soc_host, 874 struct atmel_isi, soc_host); 875 876 soc_camera_host_unregister(soc_host); 877 vb2_dma_contig_cleanup_ctx(isi->alloc_ctx); 878 dma_free_coherent(&pdev->dev, 879 sizeof(struct fbd) * MAX_BUFFER_NUM, 880 isi->p_fb_descriptors, 881 isi->fb_descriptors_phys); 882 883 return 0; 884} 885 886static int atmel_isi_probe_dt(struct atmel_isi *isi, 887 struct platform_device *pdev) 888{ 889 struct device_node *np= pdev->dev.of_node; 890 struct v4l2_of_endpoint ep; 891 int err; 892 893 /* Default settings for ISI */ 894 isi->pdata.full_mode = 1; 895 isi->pdata.mck_hz = ISI_DEFAULT_MCLK_FREQ; 896 isi->pdata.frate = ISI_CFG1_FRATE_CAPTURE_ALL; 897 898 np = of_graph_get_next_endpoint(np, NULL); 899 if (!np) { 900 dev_err(&pdev->dev, "Could not find the endpoint\n"); 901 return -EINVAL; 902 } 903 904 err = v4l2_of_parse_endpoint(np, &ep); 905 if (err) { 906 dev_err(&pdev->dev, "Could not parse the endpoint\n"); 907 goto err_probe_dt; 908 } 909 910 switch (ep.bus.parallel.bus_width) { 911 case 8: 912 isi->pdata.data_width_flags = ISI_DATAWIDTH_8; 913 break; 914 case 10: 915 isi->pdata.data_width_flags = 916 ISI_DATAWIDTH_8 | ISI_DATAWIDTH_10; 917 break; 918 default: 919 dev_err(&pdev->dev, "Unsupported bus width: %d\n", 920 ep.bus.parallel.bus_width); 921 err = -EINVAL; 922 goto err_probe_dt; 923 } 924 925err_probe_dt: 926 of_node_put(np); 927 928 return err; 929} 930 931static int atmel_isi_probe(struct platform_device *pdev) 932{ 933 unsigned int irq; 934 struct atmel_isi *isi; 935 struct resource *regs; 936 int ret, i; 937 struct device *dev = &pdev->dev; 938 struct soc_camera_host *soc_host; 939 struct isi_platform_data *pdata; 940 941 pdata = dev->platform_data; 942 if ((!pdata || !pdata->data_width_flags) && !pdev->dev.of_node) { 943 dev_err(&pdev->dev, 944 "No config available for Atmel ISI\n"); 945 return -EINVAL; 946 } 947 948 isi = devm_kzalloc(&pdev->dev, sizeof(struct atmel_isi), GFP_KERNEL); 949 if (!isi) { 950 dev_err(&pdev->dev, "Can't allocate interface!\n"); 951 return -ENOMEM; 952 } 953 954 isi->pclk = devm_clk_get(&pdev->dev, "isi_clk"); 955 if (IS_ERR(isi->pclk)) 956 return PTR_ERR(isi->pclk); 957 958 if (pdata) { 959 memcpy(&isi->pdata, pdata, sizeof(isi->pdata)); 960 } else { 961 ret = atmel_isi_probe_dt(isi, pdev); 962 if (ret) 963 return ret; 964 } 965 966 isi->active = NULL; 967 spin_lock_init(&isi->lock); 968 INIT_LIST_HEAD(&isi->video_buffer_list); 969 INIT_LIST_HEAD(&isi->dma_desc_head); 970 971 /* ISI_MCK is the sensor master clock. It should be handled by the 972 * sensor driver directly, as the ISI has no use for that clock. Make 973 * the clock optional here while platforms transition to the correct 974 * model. 975 */ 976 isi->mck = devm_clk_get(dev, "isi_mck"); 977 if (!IS_ERR(isi->mck)) { 978 /* Set ISI_MCK's frequency, it should be faster than pixel 979 * clock. 980 */ 981 ret = clk_set_rate(isi->mck, isi->pdata.mck_hz); 982 if (ret < 0) 983 return ret; 984 } 985 986 isi->p_fb_descriptors = dma_alloc_coherent(&pdev->dev, 987 sizeof(struct fbd) * MAX_BUFFER_NUM, 988 &isi->fb_descriptors_phys, 989 GFP_KERNEL); 990 if (!isi->p_fb_descriptors) { 991 dev_err(&pdev->dev, "Can't allocate descriptors!\n"); 992 return -ENOMEM; 993 } 994 995 for (i = 0; i < MAX_BUFFER_NUM; i++) { 996 isi->dma_desc[i].p_fbd = isi->p_fb_descriptors + i; 997 isi->dma_desc[i].fbd_phys = isi->fb_descriptors_phys + 998 i * sizeof(struct fbd); 999 list_add(&isi->dma_desc[i].list, &isi->dma_desc_head); 1000 } 1001 1002 isi->alloc_ctx = vb2_dma_contig_init_ctx(&pdev->dev); 1003 if (IS_ERR(isi->alloc_ctx)) { 1004 ret = PTR_ERR(isi->alloc_ctx); 1005 goto err_alloc_ctx; 1006 } 1007 1008 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1009 isi->regs = devm_ioremap_resource(&pdev->dev, regs); 1010 if (IS_ERR(isi->regs)) { 1011 ret = PTR_ERR(isi->regs); 1012 goto err_ioremap; 1013 } 1014 1015 if (isi->pdata.data_width_flags & ISI_DATAWIDTH_8) 1016 isi->width_flags = 1 << 7; 1017 if (isi->pdata.data_width_flags & ISI_DATAWIDTH_10) 1018 isi->width_flags |= 1 << 9; 1019 1020 isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS); 1021 1022 irq = platform_get_irq(pdev, 0); 1023 if (IS_ERR_VALUE(irq)) { 1024 ret = irq; 1025 goto err_req_irq; 1026 } 1027 1028 ret = devm_request_irq(&pdev->dev, irq, isi_interrupt, 0, "isi", isi); 1029 if (ret) { 1030 dev_err(&pdev->dev, "Unable to request irq %d\n", irq); 1031 goto err_req_irq; 1032 } 1033 isi->irq = irq; 1034 1035 soc_host = &isi->soc_host; 1036 soc_host->drv_name = "isi-camera"; 1037 soc_host->ops = &isi_soc_camera_host_ops; 1038 soc_host->priv = isi; 1039 soc_host->v4l2_dev.dev = &pdev->dev; 1040 soc_host->nr = pdev->id; 1041 1042 if (isi->pdata.asd_sizes) { 1043 soc_host->asd = isi->pdata.asd; 1044 soc_host->asd_sizes = isi->pdata.asd_sizes; 1045 } 1046 1047 ret = soc_camera_host_register(soc_host); 1048 if (ret) { 1049 dev_err(&pdev->dev, "Unable to register soc camera host\n"); 1050 goto err_register_soc_camera_host; 1051 } 1052 return 0; 1053 1054err_register_soc_camera_host: 1055err_req_irq: 1056err_ioremap: 1057 vb2_dma_contig_cleanup_ctx(isi->alloc_ctx); 1058err_alloc_ctx: 1059 dma_free_coherent(&pdev->dev, 1060 sizeof(struct fbd) * MAX_BUFFER_NUM, 1061 isi->p_fb_descriptors, 1062 isi->fb_descriptors_phys); 1063 1064 return ret; 1065} 1066 1067static const struct of_device_id atmel_isi_of_match[] = { 1068 { .compatible = "atmel,at91sam9g45-isi" }, 1069 { } 1070}; 1071MODULE_DEVICE_TABLE(of, atmel_isi_of_match); 1072 1073static struct platform_driver atmel_isi_driver = { 1074 .remove = atmel_isi_remove, 1075 .driver = { 1076 .name = "atmel_isi", 1077 .of_match_table = of_match_ptr(atmel_isi_of_match), 1078 }, 1079}; 1080 1081module_platform_driver_probe(atmel_isi_driver, atmel_isi_probe); 1082 1083MODULE_AUTHOR("Josh Wu <josh.wu@atmel.com>"); 1084MODULE_DESCRIPTION("The V4L2 driver for Atmel Linux"); 1085MODULE_LICENSE("GPL"); 1086MODULE_SUPPORTED_DEVICE("video"); 1087