2 * A driver for the CMOS camera controller in the Marvell 88ALP01 "cafe"
3 * multifunction chip. Currently works with the Omnivision OV7670
6 * Copyright 2006 One Laptop Per Child Association, Inc.
8 * Written by Jonathan Corbet, corbet@lwn.net.
10 * This file may be distributed under the terms of the GNU General
11 * Public License, version 2.
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/moduleparam.h>
17 #include <linux/init.h>
19 #include <linux/pci.h>
20 #include <linux/i2c.h>
21 #include <linux/interrupt.h>
22 #include <linux/spinlock.h>
23 #include <linux/videodev2.h>
24 #include <media/v4l2-common.h>
25 #include <media/v4l2-chip-ident.h>
26 #include <linux/device.h>
27 #include <linux/wait.h>
28 #include <linux/list.h>
29 #include <linux/dma-mapping.h>
30 #include <linux/delay.h>
31 #include <linux/debugfs.h>
32 #include <linux/jiffies.h>
33 #include <linux/vmalloc.h>
35 #include <asm/uaccess.h>
38 #include "cafe_ccic-regs.h"
40 #define CAFE_VERSION 0x000001
46 MODULE_AUTHOR("Jonathan Corbet <corbet@lwn.net>");
47 MODULE_DESCRIPTION("Marvell 88ALP01 CMOS Camera Controller driver");
48 MODULE_LICENSE("GPL");
49 MODULE_SUPPORTED_DEVICE("Video");
52 * Internal DMA buffer management. Since the controller cannot do S/G I/O,
53 * we must have physically contiguous buffers to bring frames into.
54 * These parameters control how many buffers we use, whether we
55 * allocate them at load time (better chance of success, but nails down
56 * memory) or when somebody tries to use the camera (riskier), and,
57 * for load-time allocation, how big they should be.
59 * The controller can cycle through three buffers. We could use
60 * more by flipping pointers around, but it probably makes little
64 #define MAX_DMA_BUFS 3
65 static int alloc_bufs_at_load = 0;
66 module_param(alloc_bufs_at_load, bool, 0444);
67 MODULE_PARM_DESC(alloc_bufs_at_load,
68 "Non-zero value causes DMA buffers to be allocated at module "
69 "load time. This increases the chances of successfully getting "
70 "those buffers, but at the cost of nailing down the memory from "
73 static int n_dma_bufs = 3;
74 module_param(n_dma_bufs, uint, 0644);
75 MODULE_PARM_DESC(n_dma_bufs,
76 "The number of DMA buffers to allocate. Can be either two "
77 "(saves memory, makes timing tighter) or three.");
79 static int dma_buf_size = VGA_WIDTH * VGA_HEIGHT * 2; /* Worst case */
80 module_param(dma_buf_size, uint, 0444);
81 MODULE_PARM_DESC(dma_buf_size,
82 "The size of the allocated DMA buffers. If actual operating "
83 "parameters require larger buffers, an attempt to reallocate "
86 static int min_buffers = 1;
87 module_param(min_buffers, uint, 0644);
88 MODULE_PARM_DESC(min_buffers,
89 "The minimum number of streaming I/O buffers we are willing "
92 static int max_buffers = 10;
93 module_param(max_buffers, uint, 0644);
94 MODULE_PARM_DESC(max_buffers,
95 "The maximum number of streaming I/O buffers an application "
96 "will be allowed to allocate. These buffers are big and live "
100 module_param(flip, bool, 0444);
101 MODULE_PARM_DESC(flip,
102 "If set, the sensor will be instructed to flip the image "
107 S_NOTREADY, /* Not yet initialized */
108 S_IDLE, /* Just hanging around */
109 S_FLAKED, /* Some sort of problem */
110 S_SINGLEREAD, /* In read() */
111 S_SPECREAD, /* Speculative read (for future read()) */
112 S_STREAMING /* Streaming data */
116 * Tracking of streaming I/O buffers.
118 struct cafe_sio_buffer {
119 struct list_head list;
120 struct v4l2_buffer v4lbuf;
121 char *buffer; /* Where it lives in kernel space */
123 struct cafe_camera *cam;
127 * A description of one of our devices.
128 * Locking: controlled by s_mutex. Certain fields, however, require
129 * the dev_lock spinlock; they are marked as such by comments.
130 * dev_lock is also required for access to device registers.
134 enum cafe_state state;
135 unsigned long flags; /* Buffer status, mainly (dev_lock) */
136 int users; /* How many open FDs */
137 struct file *owner; /* Who has data access (v4l2) */
140 * Subsystem structures.
142 struct pci_dev *pdev;
143 struct video_device v4ldev;
144 struct i2c_adapter i2c_adapter;
145 struct i2c_client *sensor;
147 unsigned char __iomem *regs;
148 struct list_head dev_list; /* link to other devices */
151 unsigned int nbufs; /* How many are alloc'd */
152 int next_buf; /* Next to consume (dev_lock) */
153 unsigned int dma_buf_size; /* allocated size */
154 void *dma_bufs[MAX_DMA_BUFS]; /* Internal buffer addresses */
155 dma_addr_t dma_handles[MAX_DMA_BUFS]; /* Buffer bus addresses */
156 unsigned int specframes; /* Unconsumed spec frames (dev_lock) */
157 unsigned int sequence; /* Frame sequence number */
158 unsigned int buf_seq[MAX_DMA_BUFS]; /* Sequence for individual buffers */
160 /* Streaming buffers */
161 unsigned int n_sbufs; /* How many we have */
162 struct cafe_sio_buffer *sb_bufs; /* The array of housekeeping structs */
163 struct list_head sb_avail; /* Available for data (we own) (dev_lock) */
164 struct list_head sb_full; /* With data (user space owns) (dev_lock) */
165 struct tasklet_struct s_tasklet;
167 /* Current operating parameters */
168 u32 sensor_type; /* Currently ov7670 only */
169 struct v4l2_pix_format pix_format;
172 struct mutex s_mutex; /* Access to this structure */
173 spinlock_t dev_lock; /* Access to device */
176 wait_queue_head_t smbus_wait; /* Waiting on i2c events */
177 wait_queue_head_t iowait; /* Waiting on frame data */
178 #ifdef CONFIG_VIDEO_ADV_DEBUG
179 struct dentry *dfs_regs;
180 struct dentry *dfs_cam_regs;
185 * Status flags. Always manipulated with bit operations.
187 #define CF_BUF0_VALID 0 /* Buffers valid - first three */
188 #define CF_BUF1_VALID 1
189 #define CF_BUF2_VALID 2
190 #define CF_DMA_ACTIVE 3 /* A frame is incoming */
191 #define CF_CONFIG_NEEDED 4 /* Must configure hardware */
196 * Start over with DMA buffers - dev_lock needed.
198 static void cafe_reset_buffers(struct cafe_camera *cam)
203 for (i = 0; i < cam->nbufs; i++)
204 clear_bit(i, &cam->flags);
208 static inline int cafe_needs_config(struct cafe_camera *cam)
210 return test_bit(CF_CONFIG_NEEDED, &cam->flags);
213 static void cafe_set_config_needed(struct cafe_camera *cam, int needed)
216 set_bit(CF_CONFIG_NEEDED, &cam->flags);
218 clear_bit(CF_CONFIG_NEEDED, &cam->flags);
225 * Debugging and related.
227 #define cam_err(cam, fmt, arg...) \
228 dev_err(&(cam)->pdev->dev, fmt, ##arg);
229 #define cam_warn(cam, fmt, arg...) \
230 dev_warn(&(cam)->pdev->dev, fmt, ##arg);
231 #define cam_dbg(cam, fmt, arg...) \
232 dev_dbg(&(cam)->pdev->dev, fmt, ##arg);
235 /* ---------------------------------------------------------------------*/
237 * We keep a simple list of known devices to search at open time.
239 static LIST_HEAD(cafe_dev_list);
240 static DEFINE_MUTEX(cafe_dev_list_lock);
242 static void cafe_add_dev(struct cafe_camera *cam)
244 mutex_lock(&cafe_dev_list_lock);
245 list_add_tail(&cam->dev_list, &cafe_dev_list);
246 mutex_unlock(&cafe_dev_list_lock);
249 static void cafe_remove_dev(struct cafe_camera *cam)
251 mutex_lock(&cafe_dev_list_lock);
252 list_del(&cam->dev_list);
253 mutex_unlock(&cafe_dev_list_lock);
256 static struct cafe_camera *cafe_find_dev(int minor)
258 struct cafe_camera *cam;
260 mutex_lock(&cafe_dev_list_lock);
261 list_for_each_entry(cam, &cafe_dev_list, dev_list) {
262 if (cam->v4ldev.minor == minor)
267 mutex_unlock(&cafe_dev_list_lock);
272 static struct cafe_camera *cafe_find_by_pdev(struct pci_dev *pdev)
274 struct cafe_camera *cam;
276 mutex_lock(&cafe_dev_list_lock);
277 list_for_each_entry(cam, &cafe_dev_list, dev_list) {
278 if (cam->pdev == pdev)
283 mutex_unlock(&cafe_dev_list_lock);
288 /* ------------------------------------------------------------------------ */
290 * Device register I/O
292 static inline void cafe_reg_write(struct cafe_camera *cam, unsigned int reg,
295 iowrite32(val, cam->regs + reg);
298 static inline unsigned int cafe_reg_read(struct cafe_camera *cam,
301 return ioread32(cam->regs + reg);
305 static inline void cafe_reg_write_mask(struct cafe_camera *cam, unsigned int reg,
306 unsigned int val, unsigned int mask)
308 unsigned int v = cafe_reg_read(cam, reg);
310 v = (v & ~mask) | (val & mask);
311 cafe_reg_write(cam, reg, v);
314 static inline void cafe_reg_clear_bit(struct cafe_camera *cam,
315 unsigned int reg, unsigned int val)
317 cafe_reg_write_mask(cam, reg, 0, val);
320 static inline void cafe_reg_set_bit(struct cafe_camera *cam,
321 unsigned int reg, unsigned int val)
323 cafe_reg_write_mask(cam, reg, val, val);
328 /* -------------------------------------------------------------------- */
330 * The I2C/SMBUS interface to the camera itself starts here. The
331 * controller handles SMBUS itself, presenting a relatively simple register
332 * interface; all we have to do is to tell it where to route the data.
334 #define CAFE_SMBUS_TIMEOUT (HZ) /* generous */
336 static int cafe_smbus_write_done(struct cafe_camera *cam)
342 * We must delay after the interrupt, or the controller gets confused
343 * and never does give us good status. Fortunately, we don't do this
347 spin_lock_irqsave(&cam->dev_lock, flags);
348 c1 = cafe_reg_read(cam, REG_TWSIC1);
349 spin_unlock_irqrestore(&cam->dev_lock, flags);
350 return (c1 & (TWSIC1_WSTAT|TWSIC1_ERROR)) != TWSIC1_WSTAT;
353 static int cafe_smbus_write_data(struct cafe_camera *cam,
354 u16 addr, u8 command, u8 value)
359 spin_lock_irqsave(&cam->dev_lock, flags);
360 rval = TWSIC0_EN | ((addr << TWSIC0_SID_SHIFT) & TWSIC0_SID);
361 rval |= TWSIC0_OVMAGIC; /* Make OV sensors work */
363 * Marvell sez set clkdiv to all 1's for now.
365 rval |= TWSIC0_CLKDIV;
366 cafe_reg_write(cam, REG_TWSIC0, rval);
367 (void) cafe_reg_read(cam, REG_TWSIC1); /* force write */
368 rval = value | ((command << TWSIC1_ADDR_SHIFT) & TWSIC1_ADDR);
369 cafe_reg_write(cam, REG_TWSIC1, rval);
370 spin_unlock_irqrestore(&cam->dev_lock, flags);
371 msleep(2); /* Required or things flake */
373 wait_event_timeout(cam->smbus_wait, cafe_smbus_write_done(cam),
375 spin_lock_irqsave(&cam->dev_lock, flags);
376 rval = cafe_reg_read(cam, REG_TWSIC1);
377 spin_unlock_irqrestore(&cam->dev_lock, flags);
379 if (rval & TWSIC1_WSTAT) {
380 cam_err(cam, "SMBUS write (%02x/%02x/%02x) timed out\n", addr,
384 if (rval & TWSIC1_ERROR) {
385 cam_err(cam, "SMBUS write (%02x/%02x/%02x) error\n", addr,
394 static int cafe_smbus_read_done(struct cafe_camera *cam)
400 * We must delay after the interrupt, or the controller gets confused
401 * and never does give us good status. Fortunately, we don't do this
405 spin_lock_irqsave(&cam->dev_lock, flags);
406 c1 = cafe_reg_read(cam, REG_TWSIC1);
407 spin_unlock_irqrestore(&cam->dev_lock, flags);
408 return c1 & (TWSIC1_RVALID|TWSIC1_ERROR);
413 static int cafe_smbus_read_data(struct cafe_camera *cam,
414 u16 addr, u8 command, u8 *value)
419 spin_lock_irqsave(&cam->dev_lock, flags);
420 rval = TWSIC0_EN | ((addr << TWSIC0_SID_SHIFT) & TWSIC0_SID);
421 rval |= TWSIC0_OVMAGIC; /* Make OV sensors work */
423 * Marvel sez set clkdiv to all 1's for now.
425 rval |= TWSIC0_CLKDIV;
426 cafe_reg_write(cam, REG_TWSIC0, rval);
427 (void) cafe_reg_read(cam, REG_TWSIC1); /* force write */
428 rval = TWSIC1_READ | ((command << TWSIC1_ADDR_SHIFT) & TWSIC1_ADDR);
429 cafe_reg_write(cam, REG_TWSIC1, rval);
430 spin_unlock_irqrestore(&cam->dev_lock, flags);
432 wait_event_timeout(cam->smbus_wait,
433 cafe_smbus_read_done(cam), CAFE_SMBUS_TIMEOUT);
434 spin_lock_irqsave(&cam->dev_lock, flags);
435 rval = cafe_reg_read(cam, REG_TWSIC1);
436 spin_unlock_irqrestore(&cam->dev_lock, flags);
438 if (rval & TWSIC1_ERROR) {
439 cam_err(cam, "SMBUS read (%02x/%02x) error\n", addr, command);
442 if (! (rval & TWSIC1_RVALID)) {
443 cam_err(cam, "SMBUS read (%02x/%02x) timed out\n", addr,
447 *value = rval & 0xff;
452 * Perform a transfer over SMBUS. This thing is called under
453 * the i2c bus lock, so we shouldn't race with ourselves...
455 static int cafe_smbus_xfer(struct i2c_adapter *adapter, u16 addr,
456 unsigned short flags, char rw, u8 command,
457 int size, union i2c_smbus_data *data)
459 struct cafe_camera *cam = i2c_get_adapdata(adapter);
463 * Refuse to talk to anything but OV cam chips. We should
464 * never even see an attempt to do so, but one never knows.
466 if (cam->sensor && addr != cam->sensor->addr) {
467 cam_err(cam, "funky smbus addr %d\n", addr);
471 * This interface would appear to only do byte data ops. OK
472 * it can do word too, but the cam chip has no use for that.
474 if (size != I2C_SMBUS_BYTE_DATA) {
475 cam_err(cam, "funky xfer size %d\n", size);
479 if (rw == I2C_SMBUS_WRITE)
480 ret = cafe_smbus_write_data(cam, addr, command, data->byte);
481 else if (rw == I2C_SMBUS_READ)
482 ret = cafe_smbus_read_data(cam, addr, command, &data->byte);
487 static void cafe_smbus_enable_irq(struct cafe_camera *cam)
491 spin_lock_irqsave(&cam->dev_lock, flags);
492 cafe_reg_set_bit(cam, REG_IRQMASK, TWSIIRQS);
493 spin_unlock_irqrestore(&cam->dev_lock, flags);
496 static u32 cafe_smbus_func(struct i2c_adapter *adapter)
498 return I2C_FUNC_SMBUS_READ_BYTE_DATA |
499 I2C_FUNC_SMBUS_WRITE_BYTE_DATA;
502 static struct i2c_algorithm cafe_smbus_algo = {
503 .smbus_xfer = cafe_smbus_xfer,
504 .functionality = cafe_smbus_func
507 /* Somebody is on the bus */
508 static int cafe_cam_init(struct cafe_camera *cam);
509 static void cafe_ctlr_stop_dma(struct cafe_camera *cam);
510 static void cafe_ctlr_power_down(struct cafe_camera *cam);
512 static int cafe_smbus_attach(struct i2c_client *client)
514 struct cafe_camera *cam = i2c_get_adapdata(client->adapter);
517 * Don't talk to chips we don't recognize.
519 if (client->driver->id == I2C_DRIVERID_OV7670) {
520 cam->sensor = client;
521 return cafe_cam_init(cam);
526 static int cafe_smbus_detach(struct i2c_client *client)
528 struct cafe_camera *cam = i2c_get_adapdata(client->adapter);
530 if (cam->sensor == client) {
531 cafe_ctlr_stop_dma(cam);
532 cafe_ctlr_power_down(cam);
533 cam_err(cam, "lost the sensor!\n");
534 cam->sensor = NULL; /* Bummer, no camera */
535 cam->state = S_NOTREADY;
540 static int cafe_smbus_setup(struct cafe_camera *cam)
542 struct i2c_adapter *adap = &cam->i2c_adapter;
545 cafe_smbus_enable_irq(cam);
546 adap->id = I2C_HW_SMBUS_CAFE;
547 adap->class = I2C_CLASS_CAM_DIGITAL;
548 adap->owner = THIS_MODULE;
549 adap->client_register = cafe_smbus_attach;
550 adap->client_unregister = cafe_smbus_detach;
551 adap->algo = &cafe_smbus_algo;
552 strcpy(adap->name, "cafe_ccic");
553 adap->dev.parent = &cam->pdev->dev;
554 i2c_set_adapdata(adap, cam);
555 ret = i2c_add_adapter(adap);
557 printk(KERN_ERR "Unable to register cafe i2c adapter\n");
561 static void cafe_smbus_shutdown(struct cafe_camera *cam)
563 i2c_del_adapter(&cam->i2c_adapter);
567 /* ------------------------------------------------------------------- */
569 * Deal with the controller.
573 * Do everything we think we need to have the interface operating
574 * according to the desired format.
576 static void cafe_ctlr_dma(struct cafe_camera *cam)
579 * Store the first two Y buffers (we aren't supporting
580 * planar formats for now, so no UV bufs). Then either
581 * set the third if it exists, or tell the controller
584 cafe_reg_write(cam, REG_Y0BAR, cam->dma_handles[0]);
585 cafe_reg_write(cam, REG_Y1BAR, cam->dma_handles[1]);
586 if (cam->nbufs > 2) {
587 cafe_reg_write(cam, REG_Y2BAR, cam->dma_handles[2]);
588 cafe_reg_clear_bit(cam, REG_CTRL1, C1_TWOBUFS);
591 cafe_reg_set_bit(cam, REG_CTRL1, C1_TWOBUFS);
592 cafe_reg_write(cam, REG_UBAR, 0); /* 32 bits only for now */
595 static void cafe_ctlr_image(struct cafe_camera *cam)
598 struct v4l2_pix_format *fmt = &cam->pix_format;
600 imgsz = ((fmt->height << IMGSZ_V_SHIFT) & IMGSZ_V_MASK) |
601 (fmt->bytesperline & IMGSZ_H_MASK);
602 cafe_reg_write(cam, REG_IMGSIZE, imgsz);
603 cafe_reg_write(cam, REG_IMGOFFSET, 0);
604 /* YPITCH just drops the last two bits */
605 cafe_reg_write_mask(cam, REG_IMGPITCH, fmt->bytesperline,
608 * Tell the controller about the image format we are using.
610 switch (cam->pix_format.pixelformat) {
611 case V4L2_PIX_FMT_YUYV:
612 cafe_reg_write_mask(cam, REG_CTRL0,
613 C0_DF_YUV|C0_YUV_PACKED|C0_YUVE_YUYV,
617 case V4L2_PIX_FMT_RGB444:
618 cafe_reg_write_mask(cam, REG_CTRL0,
619 C0_DF_RGB|C0_RGBF_444|C0_RGB4_XRGB,
624 case V4L2_PIX_FMT_RGB565:
625 cafe_reg_write_mask(cam, REG_CTRL0,
626 C0_DF_RGB|C0_RGBF_565|C0_RGB5_BGGR,
631 cam_err(cam, "Unknown format %x\n", cam->pix_format.pixelformat);
635 * Make sure it knows we want to use hsync/vsync.
637 cafe_reg_write_mask(cam, REG_CTRL0, C0_SIF_HVSYNC,
643 * Configure the controller for operation; caller holds the
646 static int cafe_ctlr_configure(struct cafe_camera *cam)
650 spin_lock_irqsave(&cam->dev_lock, flags);
652 cafe_ctlr_image(cam);
653 cafe_set_config_needed(cam, 0);
654 spin_unlock_irqrestore(&cam->dev_lock, flags);
658 static void cafe_ctlr_irq_enable(struct cafe_camera *cam)
661 * Clear any pending interrupts, since we do not
662 * expect to have I/O active prior to enabling.
664 cafe_reg_write(cam, REG_IRQSTAT, FRAMEIRQS);
665 cafe_reg_set_bit(cam, REG_IRQMASK, FRAMEIRQS);
668 static void cafe_ctlr_irq_disable(struct cafe_camera *cam)
670 cafe_reg_clear_bit(cam, REG_IRQMASK, FRAMEIRQS);
674 * Make the controller start grabbing images. Everything must
675 * be set up before doing this.
677 static void cafe_ctlr_start(struct cafe_camera *cam)
679 /* set_bit performs a read, so no other barrier should be
681 cafe_reg_set_bit(cam, REG_CTRL0, C0_ENABLE);
684 static void cafe_ctlr_stop(struct cafe_camera *cam)
686 cafe_reg_clear_bit(cam, REG_CTRL0, C0_ENABLE);
689 static void cafe_ctlr_init(struct cafe_camera *cam)
693 spin_lock_irqsave(&cam->dev_lock, flags);
695 * Added magic to bring up the hardware on the B-Test board
697 cafe_reg_write(cam, 0x3038, 0x8);
698 cafe_reg_write(cam, 0x315c, 0x80008);
700 * Go through the dance needed to wake the device up.
701 * Note that these registers are global and shared
702 * with the NAND and SD devices. Interaction between the
703 * three still needs to be examined.
705 cafe_reg_write(cam, REG_GL_CSR, GCSR_SRS|GCSR_MRS); /* Needed? */
706 cafe_reg_write(cam, REG_GL_CSR, GCSR_SRC|GCSR_MRC);
707 cafe_reg_write(cam, REG_GL_CSR, GCSR_SRC|GCSR_MRS);
708 mdelay(5); /* FIXME revisit this */
709 cafe_reg_write(cam, REG_GL_CSR, GCSR_CCIC_EN|GCSR_SRC|GCSR_MRC);
710 cafe_reg_set_bit(cam, REG_GL_IMASK, GIMSK_CCIC_EN);
712 * Make sure it's not powered down.
714 cafe_reg_clear_bit(cam, REG_CTRL1, C1_PWRDWN);
716 * Turn off the enable bit. It sure should be off anyway,
717 * but it's good to be sure.
719 cafe_reg_clear_bit(cam, REG_CTRL0, C0_ENABLE);
721 * Mask all interrupts.
723 cafe_reg_write(cam, REG_IRQMASK, 0);
725 * Clock the sensor appropriately. Controller clock should
726 * be 48MHz, sensor "typical" value is half that.
728 cafe_reg_write_mask(cam, REG_CLKCTRL, 2, CLK_DIV_MASK);
729 spin_unlock_irqrestore(&cam->dev_lock, flags);
734 * Stop the controller, and don't return until we're really sure that no
735 * further DMA is going on.
737 static void cafe_ctlr_stop_dma(struct cafe_camera *cam)
742 * Theory: stop the camera controller (whether it is operating
743 * or not). Delay briefly just in case we race with the SOF
744 * interrupt, then wait until no DMA is active.
746 spin_lock_irqsave(&cam->dev_lock, flags);
748 spin_unlock_irqrestore(&cam->dev_lock, flags);
750 wait_event_timeout(cam->iowait,
751 !test_bit(CF_DMA_ACTIVE, &cam->flags), HZ);
752 if (test_bit(CF_DMA_ACTIVE, &cam->flags))
753 cam_err(cam, "Timeout waiting for DMA to end\n");
754 /* This would be bad news - what now? */
755 spin_lock_irqsave(&cam->dev_lock, flags);
757 cafe_ctlr_irq_disable(cam);
758 spin_unlock_irqrestore(&cam->dev_lock, flags);
764 static void cafe_ctlr_power_up(struct cafe_camera *cam)
768 spin_lock_irqsave(&cam->dev_lock, flags);
769 cafe_reg_clear_bit(cam, REG_CTRL1, C1_PWRDWN);
771 * Put the sensor into operational mode (assumes OLPC-style
772 * wiring). Control 0 is reset - set to 1 to operate.
773 * Control 1 is power down, set to 0 to operate.
775 cafe_reg_write(cam, REG_GPR, GPR_C1EN|GPR_C0EN); /* pwr up, reset */
776 mdelay(1); /* Marvell says 1ms will do it */
777 cafe_reg_write(cam, REG_GPR, GPR_C1EN|GPR_C0EN|GPR_C0);
778 mdelay(1); /* Enough? */
779 spin_unlock_irqrestore(&cam->dev_lock, flags);
782 static void cafe_ctlr_power_down(struct cafe_camera *cam)
786 spin_lock_irqsave(&cam->dev_lock, flags);
787 cafe_reg_write(cam, REG_GPR, GPR_C1EN|GPR_C0EN|GPR_C1);
788 cafe_reg_set_bit(cam, REG_CTRL1, C1_PWRDWN);
789 spin_unlock_irqrestore(&cam->dev_lock, flags);
792 /* -------------------------------------------------------------------- */
794 * Communications with the sensor.
797 static int __cafe_cam_cmd(struct cafe_camera *cam, int cmd, void *arg)
799 struct i2c_client *sc = cam->sensor;
802 if (sc == NULL || sc->driver == NULL || sc->driver->command == NULL)
804 ret = sc->driver->command(sc, cmd, arg);
805 if (ret == -EPERM) /* Unsupported command */
810 static int __cafe_cam_reset(struct cafe_camera *cam)
813 return __cafe_cam_cmd(cam, VIDIOC_INT_RESET, &zero);
817 * We have found the sensor on the i2c. Let's try to have a
820 static int cafe_cam_init(struct cafe_camera *cam)
822 struct v4l2_chip_ident chip = { V4L2_CHIP_MATCH_I2C_ADDR, 0, 0, 0 };
825 mutex_lock(&cam->s_mutex);
826 if (cam->state != S_NOTREADY)
827 cam_warn(cam, "Cam init with device in funky state %d",
829 ret = __cafe_cam_reset(cam);
832 chip.match_chip = cam->sensor->addr;
833 ret = __cafe_cam_cmd(cam, VIDIOC_G_CHIP_IDENT, &chip);
836 cam->sensor_type = chip.ident;
837 // if (cam->sensor->addr != OV7xx0_SID) {
838 if (cam->sensor_type != V4L2_IDENT_OV7670) {
839 cam_err(cam, "Unsupported sensor type %d", cam->sensor->addr);
843 /* Get/set parameters? */
847 mutex_unlock(&cam->s_mutex);
852 * Configure the sensor to match the parameters we have. Caller should
855 static int cafe_cam_set_flip(struct cafe_camera *cam)
857 struct v4l2_control ctrl;
859 memset(&ctrl, 0, sizeof(ctrl));
860 ctrl.id = V4L2_CID_VFLIP;
862 return __cafe_cam_cmd(cam, VIDIOC_S_CTRL, &ctrl);
866 static int cafe_cam_configure(struct cafe_camera *cam)
868 struct v4l2_format fmt;
871 if (cam->state != S_IDLE)
873 fmt.fmt.pix = cam->pix_format;
874 ret = __cafe_cam_cmd(cam, VIDIOC_INT_INIT, &zero);
876 ret = __cafe_cam_cmd(cam, VIDIOC_S_FMT, &fmt);
878 * OV7670 does weird things if flip is set *before* format...
880 ret += cafe_cam_set_flip(cam);
884 /* -------------------------------------------------------------------- */
886 * DMA buffer management. These functions need s_mutex held.
889 /* FIXME: this is inefficient as hell, since dma_alloc_coherent just
890 * does a get_free_pages() call, and we waste a good chunk of an orderN
891 * allocation. Should try to allocate the whole set in one chunk.
893 static int cafe_alloc_dma_bufs(struct cafe_camera *cam, int loadtime)
897 cafe_set_config_needed(cam, 1);
899 cam->dma_buf_size = dma_buf_size;
901 cam->dma_buf_size = cam->pix_format.sizeimage;
906 for (i = 0; i < n_dma_bufs; i++) {
907 cam->dma_bufs[i] = dma_alloc_coherent(&cam->pdev->dev,
908 cam->dma_buf_size, cam->dma_handles + i,
910 if (cam->dma_bufs[i] == NULL) {
911 cam_warn(cam, "Failed to allocate DMA buffer\n");
914 /* For debug, remove eventually */
915 memset(cam->dma_bufs[i], 0xcc, cam->dma_buf_size);
919 switch (cam->nbufs) {
921 dma_free_coherent(&cam->pdev->dev, cam->dma_buf_size,
922 cam->dma_bufs[0], cam->dma_handles[0]);
925 cam_err(cam, "Insufficient DMA buffers, cannot operate\n");
930 cam_warn(cam, "Will limp along with only 2 buffers\n");
936 static void cafe_free_dma_bufs(struct cafe_camera *cam)
940 for (i = 0; i < cam->nbufs; i++) {
941 dma_free_coherent(&cam->pdev->dev, cam->dma_buf_size,
942 cam->dma_bufs[i], cam->dma_handles[i]);
943 cam->dma_bufs[i] = NULL;
952 /* ----------------------------------------------------------------------- */
954 * Here starts the V4L2 interface code.
958 * Read an image from the device.
960 static ssize_t cafe_deliver_buffer(struct cafe_camera *cam,
961 char __user *buffer, size_t len, loff_t *pos)
966 spin_lock_irqsave(&cam->dev_lock, flags);
967 if (cam->next_buf < 0) {
968 cam_err(cam, "deliver_buffer: No next buffer\n");
969 spin_unlock_irqrestore(&cam->dev_lock, flags);
972 bufno = cam->next_buf;
973 clear_bit(bufno, &cam->flags);
974 if (++(cam->next_buf) >= cam->nbufs)
976 if (! test_bit(cam->next_buf, &cam->flags))
979 spin_unlock_irqrestore(&cam->dev_lock, flags);
981 if (len > cam->pix_format.sizeimage)
982 len = cam->pix_format.sizeimage;
983 if (copy_to_user(buffer, cam->dma_bufs[bufno], len))
990 * Get everything ready, and start grabbing frames.
992 static int cafe_read_setup(struct cafe_camera *cam, enum cafe_state state)
998 * Configuration. If we still don't have DMA buffers,
999 * make one last, desperate attempt.
1001 if (cam->nbufs == 0)
1002 if (cafe_alloc_dma_bufs(cam, 0))
1005 if (cafe_needs_config(cam)) {
1006 cafe_cam_configure(cam);
1007 ret = cafe_ctlr_configure(cam);
1015 spin_lock_irqsave(&cam->dev_lock, flags);
1016 cafe_reset_buffers(cam);
1017 cafe_ctlr_irq_enable(cam);
1019 cafe_ctlr_start(cam);
1020 spin_unlock_irqrestore(&cam->dev_lock, flags);
1025 static ssize_t cafe_v4l_read(struct file *filp,
1026 char __user *buffer, size_t len, loff_t *pos)
1028 struct cafe_camera *cam = filp->private_data;
1032 * Perhaps we're in speculative read mode and already
1035 mutex_lock(&cam->s_mutex);
1036 if (cam->state == S_SPECREAD) {
1037 if (cam->next_buf >= 0) {
1038 ret = cafe_deliver_buffer(cam, buffer, len, pos);
1042 } else if (cam->state == S_FLAKED || cam->state == S_NOTREADY) {
1045 } else if (cam->state != S_IDLE) {
1051 * v4l2: multiple processes can open the device, but only
1052 * one gets to grab data from it.
1054 if (cam->owner && cam->owner != filp) {
1061 * Do setup if need be.
1063 if (cam->state != S_SPECREAD) {
1064 ret = cafe_read_setup(cam, S_SINGLEREAD);
1069 * Wait for something to happen. This should probably
1070 * be interruptible (FIXME).
1072 wait_event_timeout(cam->iowait, cam->next_buf >= 0, HZ);
1073 if (cam->next_buf < 0) {
1074 cam_err(cam, "read() operation timed out\n");
1075 cafe_ctlr_stop_dma(cam);
1080 * Give them their data and we should be done.
1082 ret = cafe_deliver_buffer(cam, buffer, len, pos);
1085 mutex_unlock(&cam->s_mutex);
1097 * Streaming I/O support.
1102 static int cafe_vidioc_streamon(struct file *filp, void *priv,
1103 enum v4l2_buf_type type)
1105 struct cafe_camera *cam = filp->private_data;
1108 if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1110 mutex_lock(&cam->s_mutex);
1111 if (cam->state != S_IDLE || cam->n_sbufs == 0)
1115 ret = cafe_read_setup(cam, S_STREAMING);
1118 mutex_unlock(&cam->s_mutex);
1124 static int cafe_vidioc_streamoff(struct file *filp, void *priv,
1125 enum v4l2_buf_type type)
1127 struct cafe_camera *cam = filp->private_data;
1130 if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1132 mutex_lock(&cam->s_mutex);
1133 if (cam->state != S_STREAMING)
1136 cafe_ctlr_stop_dma(cam);
1140 mutex_unlock(&cam->s_mutex);
1147 static int cafe_setup_siobuf(struct cafe_camera *cam, int index)
1149 struct cafe_sio_buffer *buf = cam->sb_bufs + index;
1151 INIT_LIST_HEAD(&buf->list);
1152 buf->v4lbuf.length = PAGE_ALIGN(cam->pix_format.sizeimage);
1153 buf->buffer = vmalloc_user(buf->v4lbuf.length);
1154 if (buf->buffer == NULL)
1159 buf->v4lbuf.index = index;
1160 buf->v4lbuf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1161 buf->v4lbuf.field = V4L2_FIELD_NONE;
1162 buf->v4lbuf.memory = V4L2_MEMORY_MMAP;
1164 * Offset: must be 32-bit even on a 64-bit system. video-buf
1165 * just uses the length times the index, but the spec warns
1166 * against doing just that - vma merging problems. So we
1167 * leave a gap between each pair of buffers.
1169 buf->v4lbuf.m.offset = 2*index*buf->v4lbuf.length;
1173 static int cafe_free_sio_buffers(struct cafe_camera *cam)
1178 * If any buffers are mapped, we cannot free them at all.
1180 for (i = 0; i < cam->n_sbufs; i++)
1181 if (cam->sb_bufs[i].mapcount > 0)
1186 for (i = 0; i < cam->n_sbufs; i++)
1187 vfree(cam->sb_bufs[i].buffer);
1189 kfree(cam->sb_bufs);
1190 cam->sb_bufs = NULL;
1191 INIT_LIST_HEAD(&cam->sb_avail);
1192 INIT_LIST_HEAD(&cam->sb_full);
1198 static int cafe_vidioc_reqbufs(struct file *filp, void *priv,
1199 struct v4l2_requestbuffers *req)
1201 struct cafe_camera *cam = filp->private_data;
1202 int ret = 0; /* Silence warning */
1205 * Make sure it's something we can do. User pointers could be
1206 * implemented without great pain, but that's not been done yet.
1208 if (req->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1210 if (req->memory != V4L2_MEMORY_MMAP)
1213 * If they ask for zero buffers, they really want us to stop streaming
1214 * (if it's happening) and free everything. Should we check owner?
1216 mutex_lock(&cam->s_mutex);
1217 if (req->count == 0) {
1218 if (cam->state == S_STREAMING)
1219 cafe_ctlr_stop_dma(cam);
1220 ret = cafe_free_sio_buffers (cam);
1224 * Device needs to be idle and working. We *could* try to do the
1225 * right thing in S_SPECREAD by shutting things down, but it
1226 * probably doesn't matter.
1228 if (cam->state != S_IDLE || (cam->owner && cam->owner != filp)) {
1234 if (req->count < min_buffers)
1235 req->count = min_buffers;
1236 else if (req->count > max_buffers)
1237 req->count = max_buffers;
1238 if (cam->n_sbufs > 0) {
1239 ret = cafe_free_sio_buffers(cam);
1244 cam->sb_bufs = kzalloc(req->count*sizeof(struct cafe_sio_buffer),
1246 if (cam->sb_bufs == NULL) {
1250 for (cam->n_sbufs = 0; cam->n_sbufs < req->count; (cam->n_sbufs++)) {
1251 ret = cafe_setup_siobuf(cam, cam->n_sbufs);
1256 if (cam->n_sbufs == 0) /* no luck at all - ret already set */
1257 kfree(cam->sb_bufs);
1258 req->count = cam->n_sbufs; /* In case of partial success */
1261 mutex_unlock(&cam->s_mutex);
1266 static int cafe_vidioc_querybuf(struct file *filp, void *priv,
1267 struct v4l2_buffer *buf)
1269 struct cafe_camera *cam = filp->private_data;
1272 mutex_lock(&cam->s_mutex);
1273 if (buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1275 if (buf->index < 0 || buf->index >= cam->n_sbufs)
1277 *buf = cam->sb_bufs[buf->index].v4lbuf;
1280 mutex_unlock(&cam->s_mutex);
1284 static int cafe_vidioc_qbuf(struct file *filp, void *priv,
1285 struct v4l2_buffer *buf)
1287 struct cafe_camera *cam = filp->private_data;
1288 struct cafe_sio_buffer *sbuf;
1290 unsigned long flags;
1292 mutex_lock(&cam->s_mutex);
1293 if (buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1295 if (buf->index < 0 || buf->index >= cam->n_sbufs)
1297 sbuf = cam->sb_bufs + buf->index;
1298 if (sbuf->v4lbuf.flags & V4L2_BUF_FLAG_QUEUED) {
1299 ret = 0; /* Already queued?? */
1302 if (sbuf->v4lbuf.flags & V4L2_BUF_FLAG_DONE) {
1303 /* Spec doesn't say anything, seems appropriate tho */
1307 sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_QUEUED;
1308 spin_lock_irqsave(&cam->dev_lock, flags);
1309 list_add(&sbuf->list, &cam->sb_avail);
1310 spin_unlock_irqrestore(&cam->dev_lock, flags);
1313 mutex_unlock(&cam->s_mutex);
1317 static int cafe_vidioc_dqbuf(struct file *filp, void *priv,
1318 struct v4l2_buffer *buf)
1320 struct cafe_camera *cam = filp->private_data;
1321 struct cafe_sio_buffer *sbuf;
1323 unsigned long flags;
1325 mutex_lock(&cam->s_mutex);
1326 if (buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1328 if (cam->state != S_STREAMING)
1330 if (list_empty(&cam->sb_full) && filp->f_flags & O_NONBLOCK) {
1335 while (list_empty(&cam->sb_full) && cam->state == S_STREAMING) {
1336 mutex_unlock(&cam->s_mutex);
1337 if (wait_event_interruptible(cam->iowait,
1338 !list_empty(&cam->sb_full))) {
1342 mutex_lock(&cam->s_mutex);
1345 if (cam->state != S_STREAMING)
1348 spin_lock_irqsave(&cam->dev_lock, flags);
1349 /* Should probably recheck !list_empty() here */
1350 sbuf = list_entry(cam->sb_full.next,
1351 struct cafe_sio_buffer, list);
1352 list_del_init(&sbuf->list);
1353 spin_unlock_irqrestore(&cam->dev_lock, flags);
1354 sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_DONE;
1355 *buf = sbuf->v4lbuf;
1360 mutex_unlock(&cam->s_mutex);
1367 static void cafe_v4l_vm_open(struct vm_area_struct *vma)
1369 struct cafe_sio_buffer *sbuf = vma->vm_private_data;
1371 * Locking: done under mmap_sem, so we don't need to
1372 * go back to the camera lock here.
1378 static void cafe_v4l_vm_close(struct vm_area_struct *vma)
1380 struct cafe_sio_buffer *sbuf = vma->vm_private_data;
1382 mutex_lock(&sbuf->cam->s_mutex);
1384 /* Docs say we should stop I/O too... */
1385 if (sbuf->mapcount == 0)
1386 sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_MAPPED;
1387 mutex_unlock(&sbuf->cam->s_mutex);
1390 static struct vm_operations_struct cafe_v4l_vm_ops = {
1391 .open = cafe_v4l_vm_open,
1392 .close = cafe_v4l_vm_close
1396 static int cafe_v4l_mmap(struct file *filp, struct vm_area_struct *vma)
1398 struct cafe_camera *cam = filp->private_data;
1399 unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
1402 struct cafe_sio_buffer *sbuf = NULL;
1404 if (! (vma->vm_flags & VM_WRITE) || ! (vma->vm_flags & VM_SHARED))
1407 * Find the buffer they are looking for.
1409 mutex_lock(&cam->s_mutex);
1410 for (i = 0; i < cam->n_sbufs; i++)
1411 if (cam->sb_bufs[i].v4lbuf.m.offset == offset) {
1412 sbuf = cam->sb_bufs + i;
1418 ret = remap_vmalloc_range(vma, sbuf->buffer, 0);
1421 vma->vm_flags |= VM_DONTEXPAND;
1422 vma->vm_private_data = sbuf;
1423 vma->vm_ops = &cafe_v4l_vm_ops;
1424 sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_MAPPED;
1425 cafe_v4l_vm_open(vma);
1428 mutex_unlock(&cam->s_mutex);
1434 static int cafe_v4l_open(struct inode *inode, struct file *filp)
1436 struct cafe_camera *cam;
1438 cam = cafe_find_dev(iminor(inode));
1441 filp->private_data = cam;
1443 mutex_lock(&cam->s_mutex);
1444 if (cam->users == 0) {
1445 cafe_ctlr_power_up(cam);
1446 __cafe_cam_reset(cam);
1447 cafe_set_config_needed(cam, 1);
1448 /* FIXME make sure this is complete */
1451 mutex_unlock(&cam->s_mutex);
1456 static int cafe_v4l_release(struct inode *inode, struct file *filp)
1458 struct cafe_camera *cam = filp->private_data;
1460 mutex_lock(&cam->s_mutex);
1462 if (filp == cam->owner) {
1463 cafe_ctlr_stop_dma(cam);
1464 cafe_free_sio_buffers(cam);
1467 if (cam->users == 0) {
1468 cafe_ctlr_power_down(cam);
1469 if (! alloc_bufs_at_load)
1470 cafe_free_dma_bufs(cam);
1472 mutex_unlock(&cam->s_mutex);
1478 static unsigned int cafe_v4l_poll(struct file *filp,
1479 struct poll_table_struct *pt)
1481 struct cafe_camera *cam = filp->private_data;
1483 poll_wait(filp, &cam->iowait, pt);
1484 if (cam->next_buf >= 0)
1485 return POLLIN | POLLRDNORM;
1491 static int cafe_vidioc_queryctrl(struct file *filp, void *priv,
1492 struct v4l2_queryctrl *qc)
1494 struct cafe_camera *cam = filp->private_data;
1497 mutex_lock(&cam->s_mutex);
1498 ret = __cafe_cam_cmd(cam, VIDIOC_QUERYCTRL, qc);
1499 mutex_unlock(&cam->s_mutex);
1504 static int cafe_vidioc_g_ctrl(struct file *filp, void *priv,
1505 struct v4l2_control *ctrl)
1507 struct cafe_camera *cam = filp->private_data;
1510 mutex_lock(&cam->s_mutex);
1511 ret = __cafe_cam_cmd(cam, VIDIOC_G_CTRL, ctrl);
1512 mutex_unlock(&cam->s_mutex);
1517 static int cafe_vidioc_s_ctrl(struct file *filp, void *priv,
1518 struct v4l2_control *ctrl)
1520 struct cafe_camera *cam = filp->private_data;
1523 mutex_lock(&cam->s_mutex);
1524 ret = __cafe_cam_cmd(cam, VIDIOC_S_CTRL, ctrl);
1525 mutex_unlock(&cam->s_mutex);
1533 static int cafe_vidioc_querycap(struct file *file, void *priv,
1534 struct v4l2_capability *cap)
1536 strcpy(cap->driver, "cafe_ccic");
1537 strcpy(cap->card, "cafe_ccic");
1538 cap->version = CAFE_VERSION;
1539 cap->capabilities = V4L2_CAP_VIDEO_CAPTURE |
1540 V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;
1546 * The default format we use until somebody says otherwise.
1548 static struct v4l2_pix_format cafe_def_pix_format = {
1550 .height = VGA_HEIGHT,
1551 .pixelformat = V4L2_PIX_FMT_YUYV,
1552 .field = V4L2_FIELD_NONE,
1553 .bytesperline = VGA_WIDTH*2,
1554 .sizeimage = VGA_WIDTH*VGA_HEIGHT*2,
1557 static int cafe_vidioc_enum_fmt_cap(struct file *filp,
1558 void *priv, struct v4l2_fmtdesc *fmt)
1560 struct cafe_camera *cam = priv;
1563 if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1565 mutex_lock(&cam->s_mutex);
1566 ret = __cafe_cam_cmd(cam, VIDIOC_ENUM_FMT, fmt);
1567 mutex_unlock(&cam->s_mutex);
1572 static int cafe_vidioc_try_fmt_cap (struct file *filp, void *priv,
1573 struct v4l2_format *fmt)
1575 struct cafe_camera *cam = priv;
1578 mutex_lock(&cam->s_mutex);
1579 ret = __cafe_cam_cmd(cam, VIDIOC_TRY_FMT, fmt);
1580 mutex_unlock(&cam->s_mutex);
1584 static int cafe_vidioc_s_fmt_cap(struct file *filp, void *priv,
1585 struct v4l2_format *fmt)
1587 struct cafe_camera *cam = priv;
1591 * Can't do anything if the device is not idle
1592 * Also can't if there are streaming buffers in place.
1594 if (cam->state != S_IDLE || cam->n_sbufs > 0)
1597 * See if the formatting works in principle.
1599 ret = cafe_vidioc_try_fmt_cap(filp, priv, fmt);
1603 * Now we start to change things for real, so let's do it
1606 mutex_lock(&cam->s_mutex);
1607 cam->pix_format = fmt->fmt.pix;
1609 * Make sure we have appropriate DMA buffers.
1612 if (cam->nbufs > 0 && cam->dma_buf_size < cam->pix_format.sizeimage)
1613 cafe_free_dma_bufs(cam);
1614 if (cam->nbufs == 0) {
1615 if (cafe_alloc_dma_bufs(cam, 0))
1619 * It looks like this might work, so let's program the sensor.
1621 ret = cafe_cam_configure(cam);
1623 ret = cafe_ctlr_configure(cam);
1625 mutex_unlock(&cam->s_mutex);
1630 * Return our stored notion of how the camera is/should be configured.
1631 * The V4l2 spec wants us to be smarter, and actually get this from
1632 * the camera (and not mess with it at open time). Someday.
1634 static int cafe_vidioc_g_fmt_cap(struct file *filp, void *priv,
1635 struct v4l2_format *f)
1637 struct cafe_camera *cam = priv;
1639 f->fmt.pix = cam->pix_format;
1644 * We only have one input - the sensor - so minimize the nonsense here.
1646 static int cafe_vidioc_enum_input(struct file *filp, void *priv,
1647 struct v4l2_input *input)
1649 if (input->index != 0)
1652 input->type = V4L2_INPUT_TYPE_CAMERA;
1653 input->std = V4L2_STD_ALL; /* Not sure what should go here */
1654 strcpy(input->name, "Camera");
1658 static int cafe_vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
1664 static int cafe_vidioc_s_input(struct file *filp, void *priv, unsigned int i)
1672 static int cafe_vidioc_s_std(struct file *filp, void *priv, v4l2_std_id *a)
1678 * G/S_PARM. Most of this is done by the sensor, but we are
1679 * the level which controls the number of read buffers.
1681 static int cafe_vidioc_g_parm(struct file *filp, void *priv,
1682 struct v4l2_streamparm *parms)
1684 struct cafe_camera *cam = priv;
1687 mutex_lock(&cam->s_mutex);
1688 ret = __cafe_cam_cmd(cam, VIDIOC_G_PARM, parms);
1689 mutex_unlock(&cam->s_mutex);
1690 parms->parm.capture.readbuffers = n_dma_bufs;
1694 static int cafe_vidioc_s_parm(struct file *filp, void *priv,
1695 struct v4l2_streamparm *parms)
1697 struct cafe_camera *cam = priv;
1700 mutex_lock(&cam->s_mutex);
1701 ret = __cafe_cam_cmd(cam, VIDIOC_S_PARM, parms);
1702 mutex_unlock(&cam->s_mutex);
1703 parms->parm.capture.readbuffers = n_dma_bufs;
1708 static void cafe_v4l_dev_release(struct video_device *vd)
1710 struct cafe_camera *cam = container_of(vd, struct cafe_camera, v4ldev);
1717 * This template device holds all of those v4l2 methods; we
1718 * clone it for specific real devices.
1721 static const struct file_operations cafe_v4l_fops = {
1722 .owner = THIS_MODULE,
1723 .open = cafe_v4l_open,
1724 .release = cafe_v4l_release,
1725 .read = cafe_v4l_read,
1726 .poll = cafe_v4l_poll,
1727 .mmap = cafe_v4l_mmap,
1728 .ioctl = video_ioctl2,
1729 .llseek = no_llseek,
1732 static struct video_device cafe_v4l_template = {
1734 .type = VFL_TYPE_GRABBER,
1735 .type2 = VID_TYPE_CAPTURE,
1736 .minor = -1, /* Get one dynamically */
1737 .tvnorms = V4L2_STD_NTSC_M,
1738 .current_norm = V4L2_STD_NTSC_M, /* make mplayer happy */
1740 .fops = &cafe_v4l_fops,
1741 .release = cafe_v4l_dev_release,
1743 .vidioc_querycap = cafe_vidioc_querycap,
1744 .vidioc_enum_fmt_cap = cafe_vidioc_enum_fmt_cap,
1745 .vidioc_try_fmt_cap = cafe_vidioc_try_fmt_cap,
1746 .vidioc_s_fmt_cap = cafe_vidioc_s_fmt_cap,
1747 .vidioc_g_fmt_cap = cafe_vidioc_g_fmt_cap,
1748 .vidioc_enum_input = cafe_vidioc_enum_input,
1749 .vidioc_g_input = cafe_vidioc_g_input,
1750 .vidioc_s_input = cafe_vidioc_s_input,
1751 .vidioc_s_std = cafe_vidioc_s_std,
1752 .vidioc_reqbufs = cafe_vidioc_reqbufs,
1753 .vidioc_querybuf = cafe_vidioc_querybuf,
1754 .vidioc_qbuf = cafe_vidioc_qbuf,
1755 .vidioc_dqbuf = cafe_vidioc_dqbuf,
1756 .vidioc_streamon = cafe_vidioc_streamon,
1757 .vidioc_streamoff = cafe_vidioc_streamoff,
1758 .vidioc_queryctrl = cafe_vidioc_queryctrl,
1759 .vidioc_g_ctrl = cafe_vidioc_g_ctrl,
1760 .vidioc_s_ctrl = cafe_vidioc_s_ctrl,
1761 .vidioc_g_parm = cafe_vidioc_g_parm,
1762 .vidioc_s_parm = cafe_vidioc_s_parm,
1771 /* ---------------------------------------------------------------------- */
1773 * Interrupt handler stuff
1778 static void cafe_frame_tasklet(unsigned long data)
1780 struct cafe_camera *cam = (struct cafe_camera *) data;
1782 unsigned long flags;
1783 struct cafe_sio_buffer *sbuf;
1785 spin_lock_irqsave(&cam->dev_lock, flags);
1786 for (i = 0; i < cam->nbufs; i++) {
1787 int bufno = cam->next_buf;
1788 if (bufno < 0) { /* "will never happen" */
1789 cam_err(cam, "No valid bufs in tasklet!\n");
1792 if (++(cam->next_buf) >= cam->nbufs)
1794 if (! test_bit(bufno, &cam->flags))
1796 if (list_empty(&cam->sb_avail))
1797 break; /* Leave it valid, hope for better later */
1798 clear_bit(bufno, &cam->flags);
1800 * We could perhaps drop the spinlock during this
1801 * big copy. Something to consider.
1803 sbuf = list_entry(cam->sb_avail.next,
1804 struct cafe_sio_buffer, list);
1805 memcpy(sbuf->buffer, cam->dma_bufs[bufno],
1806 cam->pix_format.sizeimage);
1807 sbuf->v4lbuf.bytesused = cam->pix_format.sizeimage;
1808 sbuf->v4lbuf.sequence = cam->buf_seq[bufno];
1809 sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_QUEUED;
1810 sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_DONE;
1811 list_move_tail(&sbuf->list, &cam->sb_full);
1813 if (! list_empty(&cam->sb_full))
1814 wake_up(&cam->iowait);
1815 spin_unlock_irqrestore(&cam->dev_lock, flags);
1820 static void cafe_frame_complete(struct cafe_camera *cam, int frame)
1823 * Basic frame housekeeping.
1825 if (test_bit(frame, &cam->flags) && printk_ratelimit())
1826 cam_err(cam, "Frame overrun on %d, frames lost\n", frame);
1827 set_bit(frame, &cam->flags);
1828 clear_bit(CF_DMA_ACTIVE, &cam->flags);
1829 if (cam->next_buf < 0)
1830 cam->next_buf = frame;
1831 cam->buf_seq[frame] = ++(cam->sequence);
1833 switch (cam->state) {
1835 * If in single read mode, try going speculative.
1838 cam->state = S_SPECREAD;
1839 cam->specframes = 0;
1840 wake_up(&cam->iowait);
1844 * If we are already doing speculative reads, and nobody is
1845 * reading them, just stop.
1848 if (++(cam->specframes) >= cam->nbufs) {
1849 cafe_ctlr_stop(cam);
1850 cafe_ctlr_irq_disable(cam);
1851 cam->state = S_IDLE;
1853 wake_up(&cam->iowait);
1856 * For the streaming case, we defer the real work to the
1859 * FIXME: if the application is not consuming the buffers,
1860 * we should eventually put things on hold and restart in
1864 tasklet_schedule(&cam->s_tasklet);
1868 cam_err(cam, "Frame interrupt in non-operational state\n");
1876 static void cafe_frame_irq(struct cafe_camera *cam, unsigned int irqs)
1880 cafe_reg_write(cam, REG_IRQSTAT, FRAMEIRQS); /* Clear'em all */
1882 * Handle any frame completions. There really should
1883 * not be more than one of these, or we have fallen
1886 for (frame = 0; frame < cam->nbufs; frame++)
1887 if (irqs & (IRQ_EOF0 << frame))
1888 cafe_frame_complete(cam, frame);
1890 * If a frame starts, note that we have DMA active. This
1891 * code assumes that we won't get multiple frame interrupts
1892 * at once; may want to rethink that.
1894 if (irqs & (IRQ_SOF0 | IRQ_SOF1 | IRQ_SOF2))
1895 set_bit(CF_DMA_ACTIVE, &cam->flags);
1900 static irqreturn_t cafe_irq(int irq, void *data)
1902 struct cafe_camera *cam = data;
1905 spin_lock(&cam->dev_lock);
1906 irqs = cafe_reg_read(cam, REG_IRQSTAT);
1907 if ((irqs & ALLIRQS) == 0) {
1908 spin_unlock(&cam->dev_lock);
1911 if (irqs & FRAMEIRQS)
1912 cafe_frame_irq(cam, irqs);
1913 if (irqs & TWSIIRQS) {
1914 cafe_reg_write(cam, REG_IRQSTAT, TWSIIRQS);
1915 wake_up(&cam->smbus_wait);
1917 spin_unlock(&cam->dev_lock);
1922 /* -------------------------------------------------------------------------- */
1923 #ifdef CONFIG_VIDEO_ADV_DEBUG
1928 static char cafe_debug_buf[1024];
1929 static struct dentry *cafe_dfs_root;
1931 static void cafe_dfs_setup(void)
1933 cafe_dfs_root = debugfs_create_dir("cafe_ccic", NULL);
1934 if (IS_ERR(cafe_dfs_root)) {
1935 cafe_dfs_root = NULL; /* Never mind */
1936 printk(KERN_NOTICE "cafe_ccic unable to set up debugfs\n");
1940 static void cafe_dfs_shutdown(void)
1943 debugfs_remove(cafe_dfs_root);
1946 static int cafe_dfs_open(struct inode *inode, struct file *file)
1948 file->private_data = inode->i_private;
1952 static ssize_t cafe_dfs_read_regs(struct file *file,
1953 char __user *buf, size_t count, loff_t *ppos)
1955 struct cafe_camera *cam = file->private_data;
1956 char *s = cafe_debug_buf;
1959 for (offset = 0; offset < 0x44; offset += 4)
1960 s += sprintf(s, "%02x: %08x\n", offset,
1961 cafe_reg_read(cam, offset));
1962 for (offset = 0x88; offset <= 0x90; offset += 4)
1963 s += sprintf(s, "%02x: %08x\n", offset,
1964 cafe_reg_read(cam, offset));
1965 for (offset = 0xb4; offset <= 0xbc; offset += 4)
1966 s += sprintf(s, "%02x: %08x\n", offset,
1967 cafe_reg_read(cam, offset));
1968 for (offset = 0x3000; offset <= 0x300c; offset += 4)
1969 s += sprintf(s, "%04x: %08x\n", offset,
1970 cafe_reg_read(cam, offset));
1971 return simple_read_from_buffer(buf, count, ppos, cafe_debug_buf,
1972 s - cafe_debug_buf);
1975 static const struct file_operations cafe_dfs_reg_ops = {
1976 .owner = THIS_MODULE,
1977 .read = cafe_dfs_read_regs,
1978 .open = cafe_dfs_open
1981 static ssize_t cafe_dfs_read_cam(struct file *file,
1982 char __user *buf, size_t count, loff_t *ppos)
1984 struct cafe_camera *cam = file->private_data;
1985 char *s = cafe_debug_buf;
1990 for (offset = 0x0; offset < 0x8a; offset++)
1994 cafe_smbus_read_data(cam, cam->sensor->addr, offset, &v);
1995 s += sprintf(s, "%02x: %02x\n", offset, v);
1997 return simple_read_from_buffer(buf, count, ppos, cafe_debug_buf,
1998 s - cafe_debug_buf);
2001 static const struct file_operations cafe_dfs_cam_ops = {
2002 .owner = THIS_MODULE,
2003 .read = cafe_dfs_read_cam,
2004 .open = cafe_dfs_open
2009 static void cafe_dfs_cam_setup(struct cafe_camera *cam)
2015 sprintf(fname, "regs-%d", cam->v4ldev.minor);
2016 cam->dfs_regs = debugfs_create_file(fname, 0444, cafe_dfs_root,
2017 cam, &cafe_dfs_reg_ops);
2018 sprintf(fname, "cam-%d", cam->v4ldev.minor);
2019 cam->dfs_cam_regs = debugfs_create_file(fname, 0444, cafe_dfs_root,
2020 cam, &cafe_dfs_cam_ops);
2024 static void cafe_dfs_cam_shutdown(struct cafe_camera *cam)
2026 if (! IS_ERR(cam->dfs_regs))
2027 debugfs_remove(cam->dfs_regs);
2028 if (! IS_ERR(cam->dfs_cam_regs))
2029 debugfs_remove(cam->dfs_cam_regs);
2034 #define cafe_dfs_setup()
2035 #define cafe_dfs_shutdown()
2036 #define cafe_dfs_cam_setup(cam)
2037 #define cafe_dfs_cam_shutdown(cam)
2038 #endif /* CONFIG_VIDEO_ADV_DEBUG */
2043 /* ------------------------------------------------------------------------*/
2045 * PCI interface stuff.
2048 static int cafe_pci_probe(struct pci_dev *pdev,
2049 const struct pci_device_id *id)
2053 struct cafe_camera *cam;
2055 * Make sure we have a camera here - we'll get calls for
2056 * the other cafe devices as well.
2058 pci_read_config_word(pdev, PCI_CLASS_DEVICE, &classword);
2059 if (classword != PCI_CLASS_MULTIMEDIA_VIDEO)
2062 * Start putting together one of our big camera structures.
2065 cam = kzalloc(sizeof(struct cafe_camera), GFP_KERNEL);
2068 mutex_init(&cam->s_mutex);
2069 mutex_lock(&cam->s_mutex);
2070 spin_lock_init(&cam->dev_lock);
2071 cam->state = S_NOTREADY;
2072 cafe_set_config_needed(cam, 1);
2073 init_waitqueue_head(&cam->smbus_wait);
2074 init_waitqueue_head(&cam->iowait);
2076 cam->pix_format = cafe_def_pix_format;
2077 INIT_LIST_HEAD(&cam->dev_list);
2078 INIT_LIST_HEAD(&cam->sb_avail);
2079 INIT_LIST_HEAD(&cam->sb_full);
2080 tasklet_init(&cam->s_tasklet, cafe_frame_tasklet, (unsigned long) cam);
2082 * Get set up on the PCI bus.
2084 ret = pci_enable_device(pdev);
2087 pci_set_master(pdev);
2090 cam->regs = pci_iomap(pdev, 0, 0);
2092 printk(KERN_ERR "Unable to ioremap cafe-ccic regs\n");
2095 ret = request_irq(pdev->irq, cafe_irq, IRQF_SHARED, "cafe-ccic", cam);
2098 cafe_ctlr_init(cam);
2099 cafe_ctlr_power_up(cam);
2101 * Set up I2C/SMBUS communications
2103 mutex_unlock(&cam->s_mutex); /* attach can deadlock */
2104 ret = cafe_smbus_setup(cam);
2108 * Get the v4l2 setup done.
2110 mutex_lock(&cam->s_mutex);
2111 cam->v4ldev = cafe_v4l_template;
2112 cam->v4ldev.debug = 0;
2113 // cam->v4ldev.debug = V4L2_DEBUG_IOCTL_ARG;
2114 ret = video_register_device(&cam->v4ldev, VFL_TYPE_GRABBER, -1);
2118 * If so requested, try to get our DMA buffers now.
2120 if (alloc_bufs_at_load) {
2121 if (cafe_alloc_dma_bufs(cam, 1))
2122 cam_warn(cam, "Unable to alloc DMA buffers at load"
2123 " will try again later.");
2126 cafe_dfs_cam_setup(cam);
2127 mutex_unlock(&cam->s_mutex);
2132 cafe_smbus_shutdown(cam);
2134 cafe_ctlr_power_down(cam);
2135 free_irq(pdev->irq, cam);
2137 pci_iounmap(pdev, cam->regs);
2146 * Shut down an initialized device
2148 static void cafe_shutdown(struct cafe_camera *cam)
2150 /* FIXME: Make sure we take care of everything here */
2151 cafe_dfs_cam_shutdown(cam);
2152 if (cam->n_sbufs > 0)
2153 /* What if they are still mapped? Shouldn't be, but... */
2154 cafe_free_sio_buffers(cam);
2155 cafe_remove_dev(cam);
2156 cafe_ctlr_stop_dma(cam);
2157 cafe_ctlr_power_down(cam);
2158 cafe_smbus_shutdown(cam);
2159 cafe_free_dma_bufs(cam);
2160 free_irq(cam->pdev->irq, cam);
2161 pci_iounmap(cam->pdev, cam->regs);
2162 video_unregister_device(&cam->v4ldev);
2163 /* kfree(cam); done in v4l_release () */
2167 static void cafe_pci_remove(struct pci_dev *pdev)
2169 struct cafe_camera *cam = cafe_find_by_pdev(pdev);
2172 printk(KERN_WARNING "pci_remove on unknown pdev %p\n", pdev);
2175 mutex_lock(&cam->s_mutex);
2177 cam_warn(cam, "Removing a device with users!\n");
2179 /* No unlock - it no longer exists */
2185 static struct pci_device_id cafe_ids[] = {
2186 { PCI_DEVICE(0x1148, 0x4340) }, /* Temporary ID on devel board */
2187 { PCI_DEVICE(0x11ab, 0x4100) }, /* Eventual real ID */
2188 { PCI_DEVICE(0x11ab, 0x4102) }, /* Really eventual real ID */
2192 MODULE_DEVICE_TABLE(pci, cafe_ids);
2194 static struct pci_driver cafe_pci_driver = {
2195 .name = "cafe1000-ccic",
2196 .id_table = cafe_ids,
2197 .probe = cafe_pci_probe,
2198 .remove = cafe_pci_remove,
2204 static int __init cafe_init(void)
2208 printk(KERN_NOTICE "Marvell M88ALP01 'CAFE' Camera Controller version %d\n",
2211 ret = pci_register_driver(&cafe_pci_driver);
2213 printk(KERN_ERR "Unable to register cafe_ccic driver\n");
2216 request_module("ov7670"); /* FIXME want something more general */
2224 static void __exit cafe_exit(void)
2226 pci_unregister_driver(&cafe_pci_driver);
2227 cafe_dfs_shutdown();
2230 module_init(cafe_init);
2231 module_exit(cafe_exit);