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fa027c2a0a
linux/drivers/media/video/cafe_ccic.c
Arjan van de Ven fa027c2a0a [PATCH] mark struct file_operations const 4 
Many struct file_operations in the kernel can be "const".  Marking them const
moves these to the .rodata section, which avoids false sharing with potential
dirty data.  In addition it'll catch accidental writes at compile time to
these shared resources.

[akpm@sdl.org: dvb fix]
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-12 09:48:45 -08:00

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/*
* A driver for the CMOS camera controller in the Marvell 88ALP01 "cafe"
* multifunction chip. Currently works with the Omnivision OV7670
* sensor.
*
* Copyright 2006 One Laptop Per Child Association, Inc.
*
* Written by Jonathan Corbet, corbet@lwn.net.
*
* This file may be distributed under the terms of the GNU General
* Public License, version 2.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/pci.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/videodev2.h>
#include <media/v4l2-common.h>
#include <linux/device.h>
#include <linux/wait.h>
#include <linux/list.h>
#include <linux/dma-mapping.h>
#include <linux/delay.h>
#include <linux/debugfs.h>
#include <linux/jiffies.h>
#include <linux/vmalloc.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include "cafe_ccic-regs.h"
#define CAFE_VERSION 0x000001
/*
* Parameters.
*/
MODULE_AUTHOR("Jonathan Corbet <corbet@lwn.net>");
MODULE_DESCRIPTION("Marvell 88ALP01 CMOS Camera Controller driver");
MODULE_LICENSE("GPL");
MODULE_SUPPORTED_DEVICE("Video");
/*
* Internal DMA buffer management. Since the controller cannot do S/G I/O,
* we must have physically contiguous buffers to bring frames into.
* These parameters control how many buffers we use, whether we
* allocate them at load time (better chance of success, but nails down
* memory) or when somebody tries to use the camera (riskier), and,
* for load-time allocation, how big they should be.
*
* The controller can cycle through three buffers. We could use
* more by flipping pointers around, but it probably makes little
* sense.
*/
#define MAX_DMA_BUFS 3
static int alloc_bufs_at_load = 0;
module_param(alloc_bufs_at_load, bool, 0444);
MODULE_PARM_DESC(alloc_bufs_at_load,
"Non-zero value causes DMA buffers to be allocated at module "
"load time. This increases the chances of successfully getting "
"those buffers, but at the cost of nailing down the memory from "
"the outset.");
static int n_dma_bufs = 3;
module_param(n_dma_bufs, uint, 0644);
MODULE_PARM_DESC(n_dma_bufs,
"The number of DMA buffers to allocate. Can be either two "
"(saves memory, makes timing tighter) or three.");
static int dma_buf_size = VGA_WIDTH * VGA_HEIGHT * 2; /* Worst case */
module_param(dma_buf_size, uint, 0444);
MODULE_PARM_DESC(dma_buf_size,
"The size of the allocated DMA buffers. If actual operating "
"parameters require larger buffers, an attempt to reallocate "
"will be made.");
static int min_buffers = 1;
module_param(min_buffers, uint, 0644);
MODULE_PARM_DESC(min_buffers,
"The minimum number of streaming I/O buffers we are willing "
"to work with.");
static int max_buffers = 10;
module_param(max_buffers, uint, 0644);
MODULE_PARM_DESC(max_buffers,
"The maximum number of streaming I/O buffers an application "
"will be allowed to allocate. These buffers are big and live "
"in vmalloc space.");
static int flip = 0;
module_param(flip, bool, 0444);
MODULE_PARM_DESC(flip,
"If set, the sensor will be instructed to flip the image "
"vertically.");
enum cafe_state {
S_NOTREADY, /* Not yet initialized */
S_IDLE, /* Just hanging around */
S_FLAKED, /* Some sort of problem */
S_SINGLEREAD, /* In read() */
S_SPECREAD, /* Speculative read (for future read()) */
S_STREAMING /* Streaming data */
};
/*
* Tracking of streaming I/O buffers.
*/
struct cafe_sio_buffer {
struct list_head list;
struct v4l2_buffer v4lbuf;
char *buffer; /* Where it lives in kernel space */
int mapcount;
struct cafe_camera *cam;
};
/*
* A description of one of our devices.
* Locking: controlled by s_mutex. Certain fields, however, require
* the dev_lock spinlock; they are marked as such by comments.
* dev_lock is also required for access to device registers.
*/
struct cafe_camera
{
enum cafe_state state;
unsigned long flags; /* Buffer status, mainly (dev_lock) */
int users; /* How many open FDs */
struct file *owner; /* Who has data access (v4l2) */
/*
* Subsystem structures.
*/
struct pci_dev *pdev;
struct video_device v4ldev;
struct i2c_adapter i2c_adapter;
struct i2c_client *sensor;
unsigned char __iomem *regs;
struct list_head dev_list; /* link to other devices */
/* DMA buffers */
unsigned int nbufs; /* How many are alloc'd */
int next_buf; /* Next to consume (dev_lock) */
unsigned int dma_buf_size; /* allocated size */
void *dma_bufs[MAX_DMA_BUFS]; /* Internal buffer addresses */
dma_addr_t dma_handles[MAX_DMA_BUFS]; /* Buffer bus addresses */
unsigned int specframes; /* Unconsumed spec frames (dev_lock) */
unsigned int sequence; /* Frame sequence number */
unsigned int buf_seq[MAX_DMA_BUFS]; /* Sequence for individual buffers */
/* Streaming buffers */
unsigned int n_sbufs; /* How many we have */
struct cafe_sio_buffer *sb_bufs; /* The array of housekeeping structs */
struct list_head sb_avail; /* Available for data (we own) (dev_lock) */
struct list_head sb_full; /* With data (user space owns) (dev_lock) */
struct tasklet_struct s_tasklet;
/* Current operating parameters */
enum v4l2_chip_ident sensor_type; /* Currently ov7670 only */
struct v4l2_pix_format pix_format;
/* Locks */
struct mutex s_mutex; /* Access to this structure */
spinlock_t dev_lock; /* Access to device */
/* Misc */
wait_queue_head_t smbus_wait; /* Waiting on i2c events */
wait_queue_head_t iowait; /* Waiting on frame data */
#ifdef CONFIG_VIDEO_ADV_DEBUG
struct dentry *dfs_regs;
struct dentry *dfs_cam_regs;
#endif
};
/*
* Status flags. Always manipulated with bit operations.
*/
#define CF_BUF0_VALID 0 /* Buffers valid - first three */
#define CF_BUF1_VALID 1
#define CF_BUF2_VALID 2
#define CF_DMA_ACTIVE 3 /* A frame is incoming */
#define CF_CONFIG_NEEDED 4 /* Must configure hardware */
/*
* Start over with DMA buffers - dev_lock needed.
*/
static void cafe_reset_buffers(struct cafe_camera *cam)
{
int i;
cam->next_buf = -1;
for (i = 0; i < cam->nbufs; i++)
clear_bit(i, &cam->flags);
cam->specframes = 0;
}
static inline int cafe_needs_config(struct cafe_camera *cam)
{
return test_bit(CF_CONFIG_NEEDED, &cam->flags);
}
static void cafe_set_config_needed(struct cafe_camera *cam, int needed)
{
if (needed)
set_bit(CF_CONFIG_NEEDED, &cam->flags);
else
clear_bit(CF_CONFIG_NEEDED, &cam->flags);
}
/*
* Debugging and related.
*/
#define cam_err(cam, fmt, arg...) \
dev_err(&(cam)->pdev->dev, fmt, ##arg);
#define cam_warn(cam, fmt, arg...) \
dev_warn(&(cam)->pdev->dev, fmt, ##arg);
#define cam_dbg(cam, fmt, arg...) \
dev_dbg(&(cam)->pdev->dev, fmt, ##arg);
/* ---------------------------------------------------------------------*/
/*
* We keep a simple list of known devices to search at open time.
*/
static LIST_HEAD(cafe_dev_list);
static DEFINE_MUTEX(cafe_dev_list_lock);
static void cafe_add_dev(struct cafe_camera *cam)
{
mutex_lock(&cafe_dev_list_lock);
list_add_tail(&cam->dev_list, &cafe_dev_list);
mutex_unlock(&cafe_dev_list_lock);
}
static void cafe_remove_dev(struct cafe_camera *cam)
{
mutex_lock(&cafe_dev_list_lock);
list_del(&cam->dev_list);
mutex_unlock(&cafe_dev_list_lock);
}
static struct cafe_camera *cafe_find_dev(int minor)
{
struct cafe_camera *cam;
mutex_lock(&cafe_dev_list_lock);
list_for_each_entry(cam, &cafe_dev_list, dev_list) {
if (cam->v4ldev.minor == minor)
goto done;
}
cam = NULL;
done:
mutex_unlock(&cafe_dev_list_lock);
return cam;
}
static struct cafe_camera *cafe_find_by_pdev(struct pci_dev *pdev)
{
struct cafe_camera *cam;
mutex_lock(&cafe_dev_list_lock);
list_for_each_entry(cam, &cafe_dev_list, dev_list) {
if (cam->pdev == pdev)
goto done;
}
cam = NULL;
done:
mutex_unlock(&cafe_dev_list_lock);
return cam;
}
/* ------------------------------------------------------------------------ */
/*
* Device register I/O
*/
static inline void cafe_reg_write(struct cafe_camera *cam, unsigned int reg,
unsigned int val)
{
iowrite32(val, cam->regs + reg);
}
static inline unsigned int cafe_reg_read(struct cafe_camera *cam,
unsigned int reg)
{
return ioread32(cam->regs + reg);
}
static inline void cafe_reg_write_mask(struct cafe_camera *cam, unsigned int reg,
unsigned int val, unsigned int mask)
{
unsigned int v = cafe_reg_read(cam, reg);
v = (v & ~mask) | (val & mask);
cafe_reg_write(cam, reg, v);
}
static inline void cafe_reg_clear_bit(struct cafe_camera *cam,
unsigned int reg, unsigned int val)
{
cafe_reg_write_mask(cam, reg, 0, val);
}
static inline void cafe_reg_set_bit(struct cafe_camera *cam,
unsigned int reg, unsigned int val)
{
cafe_reg_write_mask(cam, reg, val, val);
}
/* -------------------------------------------------------------------- */
/*
* The I2C/SMBUS interface to the camera itself starts here. The
* controller handles SMBUS itself, presenting a relatively simple register
* interface; all we have to do is to tell it where to route the data.
*/
#define CAFE_SMBUS_TIMEOUT (HZ) /* generous */
static int cafe_smbus_write_done(struct cafe_camera *cam)
{
unsigned long flags;
int c1;
/*
* We must delay after the interrupt, or the controller gets confused
* and never does give us good status. Fortunately, we don't do this
* often.
*/
udelay(20);
spin_lock_irqsave(&cam->dev_lock, flags);
c1 = cafe_reg_read(cam, REG_TWSIC1);
spin_unlock_irqrestore(&cam->dev_lock, flags);
return (c1 & (TWSIC1_WSTAT|TWSIC1_ERROR)) != TWSIC1_WSTAT;
}
static int cafe_smbus_write_data(struct cafe_camera *cam,
u16 addr, u8 command, u8 value)
{
unsigned int rval;
unsigned long flags;
spin_lock_irqsave(&cam->dev_lock, flags);
rval = TWSIC0_EN | ((addr << TWSIC0_SID_SHIFT) & TWSIC0_SID);
rval |= TWSIC0_OVMAGIC; /* Make OV sensors work */
/*
* Marvell sez set clkdiv to all 1's for now.
*/
rval |= TWSIC0_CLKDIV;
cafe_reg_write(cam, REG_TWSIC0, rval);
(void) cafe_reg_read(cam, REG_TWSIC1); /* force write */
rval = value | ((command << TWSIC1_ADDR_SHIFT) & TWSIC1_ADDR);
cafe_reg_write(cam, REG_TWSIC1, rval);
spin_unlock_irqrestore(&cam->dev_lock, flags);
msleep(2); /* Required or things flake */
wait_event_timeout(cam->smbus_wait, cafe_smbus_write_done(cam),
CAFE_SMBUS_TIMEOUT);
spin_lock_irqsave(&cam->dev_lock, flags);
rval = cafe_reg_read(cam, REG_TWSIC1);
spin_unlock_irqrestore(&cam->dev_lock, flags);
if (rval & TWSIC1_WSTAT) {
cam_err(cam, "SMBUS write (%02x/%02x/%02x) timed out\n", addr,
command, value);
return -EIO;
}
if (rval & TWSIC1_ERROR) {
cam_err(cam, "SMBUS write (%02x/%02x/%02x) error\n", addr,
command, value);
return -EIO;
}
return 0;
}
static int cafe_smbus_read_done(struct cafe_camera *cam)
{
unsigned long flags;
int c1;
/*
* We must delay after the interrupt, or the controller gets confused
* and never does give us good status. Fortunately, we don't do this
* often.
*/
udelay(20);
spin_lock_irqsave(&cam->dev_lock, flags);
c1 = cafe_reg_read(cam, REG_TWSIC1);
spin_unlock_irqrestore(&cam->dev_lock, flags);
return c1 & (TWSIC1_RVALID|TWSIC1_ERROR);
}
static int cafe_smbus_read_data(struct cafe_camera *cam,
u16 addr, u8 command, u8 *value)
{
unsigned int rval;
unsigned long flags;
spin_lock_irqsave(&cam->dev_lock, flags);
rval = TWSIC0_EN | ((addr << TWSIC0_SID_SHIFT) & TWSIC0_SID);
rval |= TWSIC0_OVMAGIC; /* Make OV sensors work */
/*
* Marvel sez set clkdiv to all 1's for now.
*/
rval |= TWSIC0_CLKDIV;
cafe_reg_write(cam, REG_TWSIC0, rval);
(void) cafe_reg_read(cam, REG_TWSIC1); /* force write */
rval = TWSIC1_READ | ((command << TWSIC1_ADDR_SHIFT) & TWSIC1_ADDR);
cafe_reg_write(cam, REG_TWSIC1, rval);
spin_unlock_irqrestore(&cam->dev_lock, flags);
wait_event_timeout(cam->smbus_wait,
cafe_smbus_read_done(cam), CAFE_SMBUS_TIMEOUT);
spin_lock_irqsave(&cam->dev_lock, flags);
rval = cafe_reg_read(cam, REG_TWSIC1);
spin_unlock_irqrestore(&cam->dev_lock, flags);
if (rval & TWSIC1_ERROR) {
cam_err(cam, "SMBUS read (%02x/%02x) error\n", addr, command);
return -EIO;
}
if (! (rval & TWSIC1_RVALID)) {
cam_err(cam, "SMBUS read (%02x/%02x) timed out\n", addr,
command);
return -EIO;
}
*value = rval & 0xff;
return 0;
}
/*
* Perform a transfer over SMBUS. This thing is called under
* the i2c bus lock, so we shouldn't race with ourselves...
*/
static int cafe_smbus_xfer(struct i2c_adapter *adapter, u16 addr,
unsigned short flags, char rw, u8 command,
int size, union i2c_smbus_data *data)
{
struct cafe_camera *cam = i2c_get_adapdata(adapter);
int ret = -EINVAL;
/*
* Refuse to talk to anything but OV cam chips. We should
* never even see an attempt to do so, but one never knows.
*/
if (cam->sensor && addr != cam->sensor->addr) {
cam_err(cam, "funky smbus addr %d\n", addr);
return -EINVAL;
}
/*
* This interface would appear to only do byte data ops. OK
* it can do word too, but the cam chip has no use for that.
*/
if (size != I2C_SMBUS_BYTE_DATA) {
cam_err(cam, "funky xfer size %d\n", size);
return -EINVAL;
}
if (rw == I2C_SMBUS_WRITE)
ret = cafe_smbus_write_data(cam, addr, command, data->byte);
else if (rw == I2C_SMBUS_READ)
ret = cafe_smbus_read_data(cam, addr, command, &data->byte);
return ret;
}
static void cafe_smbus_enable_irq(struct cafe_camera *cam)
{
unsigned long flags;
spin_lock_irqsave(&cam->dev_lock, flags);
cafe_reg_set_bit(cam, REG_IRQMASK, TWSIIRQS);
spin_unlock_irqrestore(&cam->dev_lock, flags);
}
static u32 cafe_smbus_func(struct i2c_adapter *adapter)
{
return I2C_FUNC_SMBUS_READ_BYTE_DATA |
I2C_FUNC_SMBUS_WRITE_BYTE_DATA;
}
static struct i2c_algorithm cafe_smbus_algo = {
.smbus_xfer = cafe_smbus_xfer,
.functionality = cafe_smbus_func
};
/* Somebody is on the bus */
static int cafe_cam_init(struct cafe_camera *cam);
static void cafe_ctlr_stop_dma(struct cafe_camera *cam);
static void cafe_ctlr_power_down(struct cafe_camera *cam);
static int cafe_smbus_attach(struct i2c_client *client)
{
struct cafe_camera *cam = i2c_get_adapdata(client->adapter);
/*
* Don't talk to chips we don't recognize.
*/
if (client->driver->id == I2C_DRIVERID_OV7670) {
cam->sensor = client;
return cafe_cam_init(cam);
}
return -EINVAL;
}
static int cafe_smbus_detach(struct i2c_client *client)
{
struct cafe_camera *cam = i2c_get_adapdata(client->adapter);
if (cam->sensor == client) {
cafe_ctlr_stop_dma(cam);
cafe_ctlr_power_down(cam);
cam_err(cam, "lost the sensor!\n");
cam->sensor = NULL; /* Bummer, no camera */
cam->state = S_NOTREADY;
}
return 0;
}
static int cafe_smbus_setup(struct cafe_camera *cam)
{
struct i2c_adapter *adap = &cam->i2c_adapter;
int ret;
cafe_smbus_enable_irq(cam);
adap->id = I2C_HW_SMBUS_CAFE;
adap->class = I2C_CLASS_CAM_DIGITAL;
adap->owner = THIS_MODULE;
adap->client_register = cafe_smbus_attach;
adap->client_unregister = cafe_smbus_detach;
adap->algo = &cafe_smbus_algo;
strcpy(adap->name, "cafe_ccic");
i2c_set_adapdata(adap, cam);
ret = i2c_add_adapter(adap);
if (ret)
printk(KERN_ERR "Unable to register cafe i2c adapter\n");
return ret;
}
static void cafe_smbus_shutdown(struct cafe_camera *cam)
{
i2c_del_adapter(&cam->i2c_adapter);
}
/* ------------------------------------------------------------------- */
/*
* Deal with the controller.
*/
/*
* Do everything we think we need to have the interface operating
* according to the desired format.
*/
static void cafe_ctlr_dma(struct cafe_camera *cam)
{
/*
* Store the first two Y buffers (we aren't supporting
* planar formats for now, so no UV bufs). Then either
* set the third if it exists, or tell the controller
* to just use two.
*/
cafe_reg_write(cam, REG_Y0BAR, cam->dma_handles[0]);
cafe_reg_write(cam, REG_Y1BAR, cam->dma_handles[1]);
if (cam->nbufs > 2) {
cafe_reg_write(cam, REG_Y2BAR, cam->dma_handles[2]);
cafe_reg_clear_bit(cam, REG_CTRL1, C1_TWOBUFS);
}
else
cafe_reg_set_bit(cam, REG_CTRL1, C1_TWOBUFS);
cafe_reg_write(cam, REG_UBAR, 0); /* 32 bits only for now */
}
static void cafe_ctlr_image(struct cafe_camera *cam)
{
int imgsz;
struct v4l2_pix_format *fmt = &cam->pix_format;
imgsz = ((fmt->height << IMGSZ_V_SHIFT) & IMGSZ_V_MASK) |
(fmt->bytesperline & IMGSZ_H_MASK);
cafe_reg_write(cam, REG_IMGSIZE, imgsz);
cafe_reg_write(cam, REG_IMGOFFSET, 0);
/* YPITCH just drops the last two bits */
cafe_reg_write_mask(cam, REG_IMGPITCH, fmt->bytesperline,
IMGP_YP_MASK);
/*
* Tell the controller about the image format we are using.
*/
switch (cam->pix_format.pixelformat) {
case V4L2_PIX_FMT_YUYV:
cafe_reg_write_mask(cam, REG_CTRL0,
C0_DF_YUV|C0_YUV_PACKED|C0_YUVE_YUYV,
C0_DF_MASK);
break;
case V4L2_PIX_FMT_RGB444:
cafe_reg_write_mask(cam, REG_CTRL0,
C0_DF_RGB|C0_RGBF_444|C0_RGB4_XRGB,
C0_DF_MASK);
/* Alpha value? */
break;
case V4L2_PIX_FMT_RGB565:
cafe_reg_write_mask(cam, REG_CTRL0,
C0_DF_RGB|C0_RGBF_565|C0_RGB5_BGGR,
C0_DF_MASK);
break;
default:
cam_err(cam, "Unknown format %x\n", cam->pix_format.pixelformat);
break;
}
/*
* Make sure it knows we want to use hsync/vsync.
*/
cafe_reg_write_mask(cam, REG_CTRL0, C0_SIF_HVSYNC,
C0_SIFM_MASK);
}
/*
* Configure the controller for operation; caller holds the
* device mutex.
*/
static int cafe_ctlr_configure(struct cafe_camera *cam)
{
unsigned long flags;
spin_lock_irqsave(&cam->dev_lock, flags);
cafe_ctlr_dma(cam);
cafe_ctlr_image(cam);
cafe_set_config_needed(cam, 0);
spin_unlock_irqrestore(&cam->dev_lock, flags);
return 0;
}
static void cafe_ctlr_irq_enable(struct cafe_camera *cam)
{
/*
* Clear any pending interrupts, since we do not
* expect to have I/O active prior to enabling.
*/
cafe_reg_write(cam, REG_IRQSTAT, FRAMEIRQS);
cafe_reg_set_bit(cam, REG_IRQMASK, FRAMEIRQS);
}
static void cafe_ctlr_irq_disable(struct cafe_camera *cam)
{
cafe_reg_clear_bit(cam, REG_IRQMASK, FRAMEIRQS);
}
/*
* Make the controller start grabbing images. Everything must
* be set up before doing this.
*/
static void cafe_ctlr_start(struct cafe_camera *cam)
{
/* set_bit performs a read, so no other barrier should be
needed here */
cafe_reg_set_bit(cam, REG_CTRL0, C0_ENABLE);
}
static void cafe_ctlr_stop(struct cafe_camera *cam)
{
cafe_reg_clear_bit(cam, REG_CTRL0, C0_ENABLE);
}
static void cafe_ctlr_init(struct cafe_camera *cam)
{
unsigned long flags;
spin_lock_irqsave(&cam->dev_lock, flags);
/*
* Added magic to bring up the hardware on the B-Test board
*/
cafe_reg_write(cam, 0x3038, 0x8);
cafe_reg_write(cam, 0x315c, 0x80008);
/*
* Go through the dance needed to wake the device up.
* Note that these registers are global and shared
* with the NAND and SD devices. Interaction between the
* three still needs to be examined.
*/
cafe_reg_write(cam, REG_GL_CSR, GCSR_SRS|GCSR_MRS); /* Needed? */
cafe_reg_write(cam, REG_GL_CSR, GCSR_SRC|GCSR_MRC);
cafe_reg_write(cam, REG_GL_CSR, GCSR_SRC|GCSR_MRS);
mdelay(5); /* FIXME revisit this */
cafe_reg_write(cam, REG_GL_CSR, GCSR_CCIC_EN|GCSR_SRC|GCSR_MRC);
cafe_reg_set_bit(cam, REG_GL_IMASK, GIMSK_CCIC_EN);
/*
* Make sure it's not powered down.
*/
cafe_reg_clear_bit(cam, REG_CTRL1, C1_PWRDWN);
/*
* Turn off the enable bit. It sure should be off anyway,
* but it's good to be sure.
*/
cafe_reg_clear_bit(cam, REG_CTRL0, C0_ENABLE);
/*
* Mask all interrupts.
*/
cafe_reg_write(cam, REG_IRQMASK, 0);
/*
* Clock the sensor appropriately. Controller clock should
* be 48MHz, sensor "typical" value is half that.
*/
cafe_reg_write_mask(cam, REG_CLKCTRL, 2, CLK_DIV_MASK);
spin_unlock_irqrestore(&cam->dev_lock, flags);
}
/*
* Stop the controller, and don't return until we're really sure that no
* further DMA is going on.
*/
static void cafe_ctlr_stop_dma(struct cafe_camera *cam)
{
unsigned long flags;
/*
* Theory: stop the camera controller (whether it is operating
* or not). Delay briefly just in case we race with the SOF
* interrupt, then wait until no DMA is active.
*/
spin_lock_irqsave(&cam->dev_lock, flags);
cafe_ctlr_stop(cam);
spin_unlock_irqrestore(&cam->dev_lock, flags);
mdelay(1);
wait_event_timeout(cam->iowait,
!test_bit(CF_DMA_ACTIVE, &cam->flags), HZ);
if (test_bit(CF_DMA_ACTIVE, &cam->flags))
cam_err(cam, "Timeout waiting for DMA to end\n");
/* This would be bad news - what now? */
spin_lock_irqsave(&cam->dev_lock, flags);
cam->state = S_IDLE;
cafe_ctlr_irq_disable(cam);
spin_unlock_irqrestore(&cam->dev_lock, flags);
}
/*
* Power up and down.
*/
static void cafe_ctlr_power_up(struct cafe_camera *cam)
{
unsigned long flags;
spin_lock_irqsave(&cam->dev_lock, flags);
cafe_reg_clear_bit(cam, REG_CTRL1, C1_PWRDWN);
/*
* Put the sensor into operational mode (assumes OLPC-style
* wiring). Control 0 is reset - set to 1 to operate.
* Control 1 is power down, set to 0 to operate.
*/
cafe_reg_write(cam, REG_GPR, GPR_C1EN|GPR_C0EN); /* pwr up, reset */
mdelay(1); /* Marvell says 1ms will do it */
cafe_reg_write(cam, REG_GPR, GPR_C1EN|GPR_C0EN|GPR_C0);
mdelay(1); /* Enough? */
spin_unlock_irqrestore(&cam->dev_lock, flags);
}
static void cafe_ctlr_power_down(struct cafe_camera *cam)
{
unsigned long flags;
spin_lock_irqsave(&cam->dev_lock, flags);
cafe_reg_write(cam, REG_GPR, GPR_C1EN|GPR_C0EN|GPR_C1);
cafe_reg_set_bit(cam, REG_CTRL1, C1_PWRDWN);
spin_unlock_irqrestore(&cam->dev_lock, flags);
}
/* -------------------------------------------------------------------- */
/*
* Communications with the sensor.
*/
static int __cafe_cam_cmd(struct cafe_camera *cam, int cmd, void *arg)
{
struct i2c_client *sc = cam->sensor;
int ret;
if (sc == NULL || sc->driver == NULL || sc->driver->command == NULL)
return -EINVAL;
ret = sc->driver->command(sc, cmd, arg);
if (ret == -EPERM) /* Unsupported command */
return 0;
return ret;
}
static int __cafe_cam_reset(struct cafe_camera *cam)
{
int zero = 0;
return __cafe_cam_cmd(cam, VIDIOC_INT_RESET, &zero);
}
/*
* We have found the sensor on the i2c. Let's try to have a
* conversation.
*/
static int cafe_cam_init(struct cafe_camera *cam)
{
int ret;
mutex_lock(&cam->s_mutex);
if (cam->state != S_NOTREADY)
cam_warn(cam, "Cam init with device in funky state %d",
cam->state);
ret = __cafe_cam_reset(cam);
if (ret)
goto out;
ret = __cafe_cam_cmd(cam, VIDIOC_INT_G_CHIP_IDENT, &cam->sensor_type);
if (ret)
goto out;
// if (cam->sensor->addr != OV7xx0_SID) {
if (cam->sensor_type != V4L2_IDENT_OV7670) {
cam_err(cam, "Unsupported sensor type %d", cam->sensor->addr);
ret = -EINVAL;
goto out;
}
/* Get/set parameters? */
ret = 0;
cam->state = S_IDLE;
out:
mutex_unlock(&cam->s_mutex);
return ret;
}
/*
* Configure the sensor to match the parameters we have. Caller should
* hold s_mutex
*/
static int cafe_cam_set_flip(struct cafe_camera *cam)
{
struct v4l2_control ctrl;
memset(&ctrl, 0, sizeof(ctrl));
ctrl.id = V4L2_CID_VFLIP;
ctrl.value = flip;
return __cafe_cam_cmd(cam, VIDIOC_S_CTRL, &ctrl);
}
static int cafe_cam_configure(struct cafe_camera *cam)
{
struct v4l2_format fmt;
int ret, zero = 0;
if (cam->state != S_IDLE)
return -EINVAL;
fmt.fmt.pix = cam->pix_format;
ret = __cafe_cam_cmd(cam, VIDIOC_INT_INIT, &zero);
if (ret == 0)
ret = __cafe_cam_cmd(cam, VIDIOC_S_FMT, &fmt);
/*
* OV7670 does weird things if flip is set *before* format...
*/
ret += cafe_cam_set_flip(cam);
return ret;
}
/* -------------------------------------------------------------------- */
/*
* DMA buffer management. These functions need s_mutex held.
*/
/* FIXME: this is inefficient as hell, since dma_alloc_coherent just
* does a get_free_pages() call, and we waste a good chunk of an orderN
* allocation. Should try to allocate the whole set in one chunk.
*/
static int cafe_alloc_dma_bufs(struct cafe_camera *cam, int loadtime)
{
int i;
cafe_set_config_needed(cam, 1);
if (loadtime)
cam->dma_buf_size = dma_buf_size;
else
cam->dma_buf_size = cam->pix_format.sizeimage;
if (n_dma_bufs > 3)
n_dma_bufs = 3;
cam->nbufs = 0;
for (i = 0; i < n_dma_bufs; i++) {
cam->dma_bufs[i] = dma_alloc_coherent(&cam->pdev->dev,
cam->dma_buf_size, cam->dma_handles + i,
GFP_KERNEL);
if (cam->dma_bufs[i] == NULL) {
cam_warn(cam, "Failed to allocate DMA buffer\n");
break;
}
/* For debug, remove eventually */
memset(cam->dma_bufs[i], 0xcc, cam->dma_buf_size);
(cam->nbufs)++;
}
switch (cam->nbufs) {
case 1:
dma_free_coherent(&cam->pdev->dev, cam->dma_buf_size,
cam->dma_bufs[0], cam->dma_handles[0]);
cam->nbufs = 0;
case 0:
cam_err(cam, "Insufficient DMA buffers, cannot operate\n");
return -ENOMEM;
case 2:
if (n_dma_bufs > 2)
cam_warn(cam, "Will limp along with only 2 buffers\n");
break;
}
return 0;
}
static void cafe_free_dma_bufs(struct cafe_camera *cam)
{
int i;
for (i = 0; i < cam->nbufs; i++) {
dma_free_coherent(&cam->pdev->dev, cam->dma_buf_size,
cam->dma_bufs[i], cam->dma_handles[i]);
cam->dma_bufs[i] = NULL;
}
cam->nbufs = 0;
}
/* ----------------------------------------------------------------------- */
/*
* Here starts the V4L2 interface code.
*/
/*
* Read an image from the device.
*/
static ssize_t cafe_deliver_buffer(struct cafe_camera *cam,
char __user *buffer, size_t len, loff_t *pos)
{
int bufno;
unsigned long flags;
spin_lock_irqsave(&cam->dev_lock, flags);
if (cam->next_buf < 0) {
cam_err(cam, "deliver_buffer: No next buffer\n");
spin_unlock_irqrestore(&cam->dev_lock, flags);
return -EIO;
}
bufno = cam->next_buf;
clear_bit(bufno, &cam->flags);
if (++(cam->next_buf) >= cam->nbufs)
cam->next_buf = 0;
if (! test_bit(cam->next_buf, &cam->flags))
cam->next_buf = -1;
cam->specframes = 0;
spin_unlock_irqrestore(&cam->dev_lock, flags);
if (len > cam->pix_format.sizeimage)
len = cam->pix_format.sizeimage;
if (copy_to_user(buffer, cam->dma_bufs[bufno], len))
return -EFAULT;
(*pos) += len;
return len;
}
/*
* Get everything ready, and start grabbing frames.
*/
static int cafe_read_setup(struct cafe_camera *cam, enum cafe_state state)
{
int ret;
unsigned long flags;
/*
* Configuration. If we still don't have DMA buffers,
* make one last, desperate attempt.
*/
if (cam->nbufs == 0)
if (cafe_alloc_dma_bufs(cam, 0))
return -ENOMEM;
if (cafe_needs_config(cam)) {
cafe_cam_configure(cam);
ret = cafe_ctlr_configure(cam);
if (ret)
return ret;
}
/*
* Turn it loose.
*/
spin_lock_irqsave(&cam->dev_lock, flags);
cafe_reset_buffers(cam);
cafe_ctlr_irq_enable(cam);
cam->state = state;
cafe_ctlr_start(cam);
spin_unlock_irqrestore(&cam->dev_lock, flags);
return 0;
}
static ssize_t cafe_v4l_read(struct file *filp,
char __user *buffer, size_t len, loff_t *pos)
{
struct cafe_camera *cam = filp->private_data;
int ret;
/*
* Perhaps we're in speculative read mode and already
* have data?
*/
mutex_lock(&cam->s_mutex);
if (cam->state == S_SPECREAD) {
if (cam->next_buf >= 0) {
ret = cafe_deliver_buffer(cam, buffer, len, pos);
if (ret != 0)
goto out_unlock;
}
} else if (cam->state == S_FLAKED || cam->state == S_NOTREADY) {
ret = -EIO;
goto out_unlock;
} else if (cam->state != S_IDLE) {
ret = -EBUSY;
goto out_unlock;
}
/*
* v4l2: multiple processes can open the device, but only
* one gets to grab data from it.
*/
if (cam->owner && cam->owner != filp) {
ret = -EBUSY;
goto out_unlock;
}
cam->owner = filp;
/*
* Do setup if need be.
*/
if (cam->state != S_SPECREAD) {
ret = cafe_read_setup(cam, S_SINGLEREAD);
if (ret)
goto out_unlock;
}
/*
* Wait for something to happen. This should probably
* be interruptible (FIXME).
*/
wait_event_timeout(cam->iowait, cam->next_buf >= 0, HZ);
if (cam->next_buf < 0) {
cam_err(cam, "read() operation timed out\n");
cafe_ctlr_stop_dma(cam);
ret = -EIO;
goto out_unlock;
}
/*
* Give them their data and we should be done.
*/
ret = cafe_deliver_buffer(cam, buffer, len, pos);
out_unlock:
mutex_unlock(&cam->s_mutex);
return ret;
}
/*
* Streaming I/O support.
*/
static int cafe_vidioc_streamon(struct file *filp, void *priv,
enum v4l2_buf_type type)
{
struct cafe_camera *cam = filp->private_data;
int ret = -EINVAL;
if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
goto out;
mutex_lock(&cam->s_mutex);
if (cam->state != S_IDLE || cam->n_sbufs == 0)
goto out_unlock;
cam->sequence = 0;
ret = cafe_read_setup(cam, S_STREAMING);
out_unlock:
mutex_unlock(&cam->s_mutex);
out:
return ret;
}
static int cafe_vidioc_streamoff(struct file *filp, void *priv,
enum v4l2_buf_type type)
{
struct cafe_camera *cam = filp->private_data;
int ret = -EINVAL;
if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
goto out;
mutex_lock(&cam->s_mutex);
if (cam->state != S_STREAMING)
goto out_unlock;
cafe_ctlr_stop_dma(cam);
ret = 0;
out_unlock:
mutex_unlock(&cam->s_mutex);
out:
return ret;
}
static int cafe_setup_siobuf(struct cafe_camera *cam, int index)
{
struct cafe_sio_buffer *buf = cam->sb_bufs + index;
INIT_LIST_HEAD(&buf->list);
buf->v4lbuf.length = PAGE_ALIGN(cam->pix_format.sizeimage);
buf->buffer = vmalloc_user(buf->v4lbuf.length);
if (buf->buffer == NULL)
return -ENOMEM;
buf->mapcount = 0;
buf->cam = cam;
buf->v4lbuf.index = index;
buf->v4lbuf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf->v4lbuf.field = V4L2_FIELD_NONE;
buf->v4lbuf.memory = V4L2_MEMORY_MMAP;
/*
* Offset: must be 32-bit even on a 64-bit system. video-buf
* just uses the length times the index, but the spec warns
* against doing just that - vma merging problems. So we
* leave a gap between each pair of buffers.
*/
buf->v4lbuf.m.offset = 2*index*buf->v4lbuf.length;
return 0;
}
static int cafe_free_sio_buffers(struct cafe_camera *cam)
{
int i;
/*
* If any buffers are mapped, we cannot free them at all.
*/
for (i = 0; i < cam->n_sbufs; i++)
if (cam->sb_bufs[i].mapcount > 0)
return -EBUSY;
/*
* OK, let's do it.
*/
for (i = 0; i < cam->n_sbufs; i++)
vfree(cam->sb_bufs[i].buffer);
cam->n_sbufs = 0;
kfree(cam->sb_bufs);
cam->sb_bufs = NULL;
INIT_LIST_HEAD(&cam->sb_avail);
INIT_LIST_HEAD(&cam->sb_full);
return 0;
}
static int cafe_vidioc_reqbufs(struct file *filp, void *priv,
struct v4l2_requestbuffers *req)
{
struct cafe_camera *cam = filp->private_data;
int ret;
/*
* Make sure it's something we can do. User pointers could be
* implemented without great pain, but that's not been done yet.
*/
if (req->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
if (req->memory != V4L2_MEMORY_MMAP)
return -EINVAL;
/*
* If they ask for zero buffers, they really want us to stop streaming
* (if it's happening) and free everything. Should we check owner?
*/
mutex_lock(&cam->s_mutex);
if (req->count == 0) {
if (cam->state == S_STREAMING)
cafe_ctlr_stop_dma(cam);
ret = cafe_free_sio_buffers (cam);
goto out;
}
/*
* Device needs to be idle and working. We *could* try to do the
* right thing in S_SPECREAD by shutting things down, but it
* probably doesn't matter.
*/
if (cam->state != S_IDLE || (cam->owner && cam->owner != filp)) {
ret = -EBUSY;
goto out;
}
cam->owner = filp;
if (req->count < min_buffers)
req->count = min_buffers;
else if (req->count > max_buffers)
req->count = max_buffers;
if (cam->n_sbufs > 0) {
ret = cafe_free_sio_buffers(cam);
if (ret)
goto out;
}
cam->sb_bufs = kzalloc(req->count*sizeof(struct cafe_sio_buffer),
GFP_KERNEL);
if (cam->sb_bufs == NULL) {
ret = -ENOMEM;
goto out;
}
for (cam->n_sbufs = 0; cam->n_sbufs < req->count; (cam->n_sbufs++)) {
ret = cafe_setup_siobuf(cam, cam->n_sbufs);
if (ret)
break;
}
if (cam->n_sbufs == 0) /* no luck at all - ret already set */
kfree(cam->sb_bufs);
else
ret = 0;
req->count = cam->n_sbufs; /* In case of partial success */
out:
mutex_unlock(&cam->s_mutex);
return ret;
}
static int cafe_vidioc_querybuf(struct file *filp, void *priv,
struct v4l2_buffer *buf)
{
struct cafe_camera *cam = filp->private_data;
int ret = -EINVAL;
mutex_lock(&cam->s_mutex);
if (buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
goto out;
if (buf->index < 0 || buf->index >= cam->n_sbufs)
goto out;
*buf = cam->sb_bufs[buf->index].v4lbuf;
ret = 0;
out:
mutex_unlock(&cam->s_mutex);
return ret;
}
static int cafe_vidioc_qbuf(struct file *filp, void *priv,
struct v4l2_buffer *buf)
{
struct cafe_camera *cam = filp->private_data;
struct cafe_sio_buffer *sbuf;
int ret = -EINVAL;
unsigned long flags;
mutex_lock(&cam->s_mutex);
if (buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
goto out;
if (buf->index < 0 || buf->index >= cam->n_sbufs)
goto out;
sbuf = cam->sb_bufs + buf->index;
if (sbuf->v4lbuf.flags & V4L2_BUF_FLAG_QUEUED) {
ret = 0; /* Already queued?? */
goto out;
}
if (sbuf->v4lbuf.flags & V4L2_BUF_FLAG_DONE) {
/* Spec doesn't say anything, seems appropriate tho */
ret = -EBUSY;
goto out;
}
sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_QUEUED;
spin_lock_irqsave(&cam->dev_lock, flags);
list_add(&sbuf->list, &cam->sb_avail);
spin_unlock_irqrestore(&cam->dev_lock, flags);
ret = 0;
out:
mutex_unlock(&cam->s_mutex);
return ret;
}
static int cafe_vidioc_dqbuf(struct file *filp, void *priv,
struct v4l2_buffer *buf)
{
struct cafe_camera *cam = filp->private_data;
struct cafe_sio_buffer *sbuf;
int ret = -EINVAL;
unsigned long flags;
mutex_lock(&cam->s_mutex);
if (buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
goto out_unlock;
if (cam->state != S_STREAMING)
goto out_unlock;
if (list_empty(&cam->sb_full) && filp->f_flags & O_NONBLOCK) {
ret = -EAGAIN;
goto out_unlock;
}
while (list_empty(&cam->sb_full) && cam->state == S_STREAMING) {
mutex_unlock(&cam->s_mutex);
if (wait_event_interruptible(cam->iowait,
!list_empty(&cam->sb_full))) {
ret = -ERESTARTSYS;
goto out;
}
mutex_lock(&cam->s_mutex);
}
if (cam->state != S_STREAMING)
ret = -EINTR;
else {
spin_lock_irqsave(&cam->dev_lock, flags);
/* Should probably recheck !list_empty() here */
sbuf = list_entry(cam->sb_full.next,
struct cafe_sio_buffer, list);
list_del_init(&sbuf->list);
spin_unlock_irqrestore(&cam->dev_lock, flags);
sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_DONE;
*buf = sbuf->v4lbuf;
ret = 0;
}
out_unlock:
mutex_unlock(&cam->s_mutex);
out:
return ret;
}
static void cafe_v4l_vm_open(struct vm_area_struct *vma)
{
struct cafe_sio_buffer *sbuf = vma->vm_private_data;
/*
* Locking: done under mmap_sem, so we don't need to
* go back to the camera lock here.
*/
sbuf->mapcount++;
}
static void cafe_v4l_vm_close(struct vm_area_struct *vma)
{
struct cafe_sio_buffer *sbuf = vma->vm_private_data;
mutex_lock(&sbuf->cam->s_mutex);
sbuf->mapcount--;
/* Docs say we should stop I/O too... */
if (sbuf->mapcount == 0)
sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_MAPPED;
mutex_unlock(&sbuf->cam->s_mutex);
}
static struct vm_operations_struct cafe_v4l_vm_ops = {
.open = cafe_v4l_vm_open,
.close = cafe_v4l_vm_close
};
static int cafe_v4l_mmap(struct file *filp, struct vm_area_struct *vma)
{
struct cafe_camera *cam = filp->private_data;
unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
int ret = -EINVAL;
int i;
struct cafe_sio_buffer *sbuf = NULL;
if (! (vma->vm_flags & VM_WRITE) || ! (vma->vm_flags & VM_SHARED))
return -EINVAL;
/*
* Find the buffer they are looking for.
*/
mutex_lock(&cam->s_mutex);
for (i = 0; i < cam->n_sbufs; i++)
if (cam->sb_bufs[i].v4lbuf.m.offset == offset) {
sbuf = cam->sb_bufs + i;
break;
}
if (sbuf == NULL)
goto out;
ret = remap_vmalloc_range(vma, sbuf->buffer, 0);
if (ret)
goto out;
vma->vm_flags |= VM_DONTEXPAND;
vma->vm_private_data = sbuf;
vma->vm_ops = &cafe_v4l_vm_ops;
sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_MAPPED;
cafe_v4l_vm_open(vma);
ret = 0;
out:
mutex_unlock(&cam->s_mutex);
return ret;
}
static int cafe_v4l_open(struct inode *inode, struct file *filp)
{
struct cafe_camera *cam;
cam = cafe_find_dev(iminor(inode));
if (cam == NULL)
return -ENODEV;
filp->private_data = cam;
mutex_lock(&cam->s_mutex);
if (cam->users == 0) {
cafe_ctlr_power_up(cam);
__cafe_cam_reset(cam);
cafe_set_config_needed(cam, 1);
/* FIXME make sure this is complete */
}
(cam->users)++;
mutex_unlock(&cam->s_mutex);
return 0;
}
static int cafe_v4l_release(struct inode *inode, struct file *filp)
{
struct cafe_camera *cam = filp->private_data;
mutex_lock(&cam->s_mutex);
(cam->users)--;
if (filp == cam->owner) {
cafe_ctlr_stop_dma(cam);
cafe_free_sio_buffers(cam);
cam->owner = NULL;
}
if (cam->users == 0) {
cafe_ctlr_power_down(cam);
if (! alloc_bufs_at_load)
cafe_free_dma_bufs(cam);
}
mutex_unlock(&cam->s_mutex);
return 0;
}
static unsigned int cafe_v4l_poll(struct file *filp,
struct poll_table_struct *pt)
{
struct cafe_camera *cam = filp->private_data;
poll_wait(filp, &cam->iowait, pt);
if (cam->next_buf >= 0)
return POLLIN | POLLRDNORM;
return 0;
}
static int cafe_vidioc_queryctrl(struct file *filp, void *priv,
struct v4l2_queryctrl *qc)
{
struct cafe_camera *cam = filp->private_data;
int ret;
mutex_lock(&cam->s_mutex);
ret = __cafe_cam_cmd(cam, VIDIOC_QUERYCTRL, qc);
mutex_unlock(&cam->s_mutex);
return ret;
}
static int cafe_vidioc_g_ctrl(struct file *filp, void *priv,
struct v4l2_control *ctrl)
{
struct cafe_camera *cam = filp->private_data;
int ret;
mutex_lock(&cam->s_mutex);
ret = __cafe_cam_cmd(cam, VIDIOC_G_CTRL, ctrl);
mutex_unlock(&cam->s_mutex);
return ret;
}
static int cafe_vidioc_s_ctrl(struct file *filp, void *priv,
struct v4l2_control *ctrl)
{
struct cafe_camera *cam = filp->private_data;
int ret;
mutex_lock(&cam->s_mutex);
ret = __cafe_cam_cmd(cam, VIDIOC_S_CTRL, ctrl);
mutex_unlock(&cam->s_mutex);
return ret;
}
static int cafe_vidioc_querycap(struct file *file, void *priv,
struct v4l2_capability *cap)
{
strcpy(cap->driver, "cafe_ccic");
strcpy(cap->card, "cafe_ccic");
cap->version = CAFE_VERSION;
cap->capabilities = V4L2_CAP_VIDEO_CAPTURE |
V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;
return 0;
}
/*
* The default format we use until somebody says otherwise.
*/
static struct v4l2_pix_format cafe_def_pix_format = {
.width = VGA_WIDTH,
.height = VGA_HEIGHT,
.pixelformat = V4L2_PIX_FMT_YUYV,
.field = V4L2_FIELD_NONE,
.bytesperline = VGA_WIDTH*2,
.sizeimage = VGA_WIDTH*VGA_HEIGHT*2,
};
static int cafe_vidioc_enum_fmt_cap(struct file *filp,
void *priv, struct v4l2_fmtdesc *fmt)
{
struct cafe_camera *cam = priv;
int ret;
if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
mutex_lock(&cam->s_mutex);
ret = __cafe_cam_cmd(cam, VIDIOC_ENUM_FMT, fmt);
mutex_unlock(&cam->s_mutex);
return ret;
}
static int cafe_vidioc_try_fmt_cap (struct file *filp, void *priv,
struct v4l2_format *fmt)
{
struct cafe_camera *cam = priv;
int ret;
mutex_lock(&cam->s_mutex);
ret = __cafe_cam_cmd(cam, VIDIOC_TRY_FMT, fmt);
mutex_unlock(&cam->s_mutex);
return ret;
}
static int cafe_vidioc_s_fmt_cap(struct file *filp, void *priv,
struct v4l2_format *fmt)
{
struct cafe_camera *cam = priv;
int ret;
/*
* Can't do anything if the device is not idle
* Also can't if there are streaming buffers in place.
*/
if (cam->state != S_IDLE || cam->n_sbufs > 0)
return -EBUSY;
/*
* See if the formatting works in principle.
*/
ret = cafe_vidioc_try_fmt_cap(filp, priv, fmt);
if (ret)
return ret;
/*
* Now we start to change things for real, so let's do it
* under lock.
*/
mutex_lock(&cam->s_mutex);
cam->pix_format = fmt->fmt.pix;
/*
* Make sure we have appropriate DMA buffers.
*/
ret = -ENOMEM;
if (cam->nbufs > 0 && cam->dma_buf_size < cam->pix_format.sizeimage)
cafe_free_dma_bufs(cam);
if (cam->nbufs == 0) {
if (cafe_alloc_dma_bufs(cam, 0))
goto out;
}
/*
* It looks like this might work, so let's program the sensor.
*/
ret = cafe_cam_configure(cam);
if (! ret)
ret = cafe_ctlr_configure(cam);
out:
mutex_unlock(&cam->s_mutex);
return ret;
}
/*
* Return our stored notion of how the camera is/should be configured.
* The V4l2 spec wants us to be smarter, and actually get this from
* the camera (and not mess with it at open time). Someday.
*/
static int cafe_vidioc_g_fmt_cap(struct file *filp, void *priv,
struct v4l2_format *f)
{
struct cafe_camera *cam = priv;
f->fmt.pix = cam->pix_format;
return 0;
}
/*
* We only have one input - the sensor - so minimize the nonsense here.
*/
static int cafe_vidioc_enum_input(struct file *filp, void *priv,
struct v4l2_input *input)
{
if (input->index != 0)
return -EINVAL;
input->type = V4L2_INPUT_TYPE_CAMERA;
input->std = V4L2_STD_ALL; /* Not sure what should go here */
strcpy(input->name, "Camera");
return 0;
}
static int cafe_vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
{
*i = 0;
return 0;
}
static int cafe_vidioc_s_input(struct file *filp, void *priv, unsigned int i)
{
if (i != 0)
return -EINVAL;
return 0;
}
/* from vivi.c */
static int cafe_vidioc_s_std(struct file *filp, void *priv, v4l2_std_id *a)
{
return 0;
}
/*
* G/S_PARM. Most of this is done by the sensor, but we are
* the level which controls the number of read buffers.
*/
static int cafe_vidioc_g_parm(struct file *filp, void *priv,
struct v4l2_streamparm *parms)
{
struct cafe_camera *cam = priv;
int ret;
mutex_lock(&cam->s_mutex);
ret = __cafe_cam_cmd(cam, VIDIOC_G_PARM, parms);
mutex_unlock(&cam->s_mutex);
parms->parm.capture.readbuffers = n_dma_bufs;
return ret;
}
static int cafe_vidioc_s_parm(struct file *filp, void *priv,
struct v4l2_streamparm *parms)
{
struct cafe_camera *cam = priv;
int ret;
mutex_lock(&cam->s_mutex);
ret = __cafe_cam_cmd(cam, VIDIOC_S_PARM, parms);
mutex_unlock(&cam->s_mutex);
parms->parm.capture.readbuffers = n_dma_bufs;
return ret;
}
static void cafe_v4l_dev_release(struct video_device *vd)
{
struct cafe_camera *cam = container_of(vd, struct cafe_camera, v4ldev);
kfree(cam);
}
/*
* This template device holds all of those v4l2 methods; we
* clone it for specific real devices.
*/
static const struct file_operations cafe_v4l_fops = {
.owner = THIS_MODULE,
.open = cafe_v4l_open,
.release = cafe_v4l_release,
.read = cafe_v4l_read,
.poll = cafe_v4l_poll,
.mmap = cafe_v4l_mmap,
.ioctl = video_ioctl2,
.llseek = no_llseek,
};
static struct video_device cafe_v4l_template = {
.name = "cafe",
.type = VFL_TYPE_GRABBER,
.type2 = VID_TYPE_CAPTURE,
.minor = -1, /* Get one dynamically */
.tvnorms = V4L2_STD_NTSC_M,
.current_norm = V4L2_STD_NTSC_M, /* make mplayer happy */
.fops = &cafe_v4l_fops,
.release = cafe_v4l_dev_release,
.vidioc_querycap = cafe_vidioc_querycap,
.vidioc_enum_fmt_cap = cafe_vidioc_enum_fmt_cap,
.vidioc_try_fmt_cap = cafe_vidioc_try_fmt_cap,
.vidioc_s_fmt_cap = cafe_vidioc_s_fmt_cap,
.vidioc_g_fmt_cap = cafe_vidioc_g_fmt_cap,
.vidioc_enum_input = cafe_vidioc_enum_input,
.vidioc_g_input = cafe_vidioc_g_input,
.vidioc_s_input = cafe_vidioc_s_input,
.vidioc_s_std = cafe_vidioc_s_std,
.vidioc_reqbufs = cafe_vidioc_reqbufs,
.vidioc_querybuf = cafe_vidioc_querybuf,
.vidioc_qbuf = cafe_vidioc_qbuf,
.vidioc_dqbuf = cafe_vidioc_dqbuf,
.vidioc_streamon = cafe_vidioc_streamon,
.vidioc_streamoff = cafe_vidioc_streamoff,
.vidioc_queryctrl = cafe_vidioc_queryctrl,
.vidioc_g_ctrl = cafe_vidioc_g_ctrl,
.vidioc_s_ctrl = cafe_vidioc_s_ctrl,
.vidioc_g_parm = cafe_vidioc_g_parm,
.vidioc_s_parm = cafe_vidioc_s_parm,
};
/* ---------------------------------------------------------------------- */
/*
* Interrupt handler stuff
*/
static void cafe_frame_tasklet(unsigned long data)
{
struct cafe_camera *cam = (struct cafe_camera *) data;
int i;
unsigned long flags;
struct cafe_sio_buffer *sbuf;
spin_lock_irqsave(&cam->dev_lock, flags);
for (i = 0; i < cam->nbufs; i++) {
int bufno = cam->next_buf;
if (bufno < 0) { /* "will never happen" */
cam_err(cam, "No valid bufs in tasklet!\n");
break;
}
if (++(cam->next_buf) >= cam->nbufs)
cam->next_buf = 0;
if (! test_bit(bufno, &cam->flags))
continue;
if (list_empty(&cam->sb_avail))
break; /* Leave it valid, hope for better later */
clear_bit(bufno, &cam->flags);
/*
* We could perhaps drop the spinlock during this
* big copy. Something to consider.
*/
sbuf = list_entry(cam->sb_avail.next,
struct cafe_sio_buffer, list);
memcpy(sbuf->buffer, cam->dma_bufs[bufno],
cam->pix_format.sizeimage);
sbuf->v4lbuf.bytesused = cam->pix_format.sizeimage;
sbuf->v4lbuf.sequence = cam->buf_seq[bufno];
sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_QUEUED;
sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_DONE;
list_move_tail(&sbuf->list, &cam->sb_full);
}
if (! list_empty(&cam->sb_full))
wake_up(&cam->iowait);
spin_unlock_irqrestore(&cam->dev_lock, flags);
}
static void cafe_frame_complete(struct cafe_camera *cam, int frame)
{
/*
* Basic frame housekeeping.
*/
if (test_bit(frame, &cam->flags) && printk_ratelimit())
cam_err(cam, "Frame overrun on %d, frames lost\n", frame);
set_bit(frame, &cam->flags);
clear_bit(CF_DMA_ACTIVE, &cam->flags);
if (cam->next_buf < 0)
cam->next_buf = frame;
cam->buf_seq[frame] = ++(cam->sequence);
switch (cam->state) {
/*
* If in single read mode, try going speculative.
*/
case S_SINGLEREAD:
cam->state = S_SPECREAD;
cam->specframes = 0;
wake_up(&cam->iowait);
break;
/*
* If we are already doing speculative reads, and nobody is
* reading them, just stop.
*/
case S_SPECREAD:
if (++(cam->specframes) >= cam->nbufs) {
cafe_ctlr_stop(cam);
cafe_ctlr_irq_disable(cam);
cam->state = S_IDLE;
}
wake_up(&cam->iowait);
break;
/*
* For the streaming case, we defer the real work to the
* camera tasklet.
*
* FIXME: if the application is not consuming the buffers,
* we should eventually put things on hold and restart in
* vidioc_dqbuf().
*/
case S_STREAMING:
tasklet_schedule(&cam->s_tasklet);
break;
default:
cam_err(cam, "Frame interrupt in non-operational state\n");
break;
}
}
static void cafe_frame_irq(struct cafe_camera *cam, unsigned int irqs)
{
unsigned int frame;
cafe_reg_write(cam, REG_IRQSTAT, FRAMEIRQS); /* Clear'em all */
/*
* Handle any frame completions. There really should
* not be more than one of these, or we have fallen
* far behind.
*/
for (frame = 0; frame < cam->nbufs; frame++)
if (irqs & (IRQ_EOF0 << frame))
cafe_frame_complete(cam, frame);
/*
* If a frame starts, note that we have DMA active. This
* code assumes that we won't get multiple frame interrupts
* at once; may want to rethink that.
*/
if (irqs & (IRQ_SOF0 | IRQ_SOF1 | IRQ_SOF2))
set_bit(CF_DMA_ACTIVE, &cam->flags);
}
static irqreturn_t cafe_irq(int irq, void *data)
{
struct cafe_camera *cam = data;
unsigned int irqs;
spin_lock(&cam->dev_lock);
irqs = cafe_reg_read(cam, REG_IRQSTAT);
if ((irqs & ALLIRQS) == 0) {
spin_unlock(&cam->dev_lock);
return IRQ_NONE;
}
if (irqs & FRAMEIRQS)
cafe_frame_irq(cam, irqs);
if (irqs & TWSIIRQS) {
cafe_reg_write(cam, REG_IRQSTAT, TWSIIRQS);
wake_up(&cam->smbus_wait);
}
spin_unlock(&cam->dev_lock);
return IRQ_HANDLED;
}
/* -------------------------------------------------------------------------- */
#ifdef CONFIG_VIDEO_ADV_DEBUG
/*
* Debugfs stuff.
*/
static char cafe_debug_buf[1024];
static struct dentry *cafe_dfs_root;
static void cafe_dfs_setup(void)
{
cafe_dfs_root = debugfs_create_dir("cafe_ccic", NULL);
if (IS_ERR(cafe_dfs_root)) {
cafe_dfs_root = NULL; /* Never mind */
printk(KERN_NOTICE "cafe_ccic unable to set up debugfs\n");
}
}
static void cafe_dfs_shutdown(void)
{
if (cafe_dfs_root)
debugfs_remove(cafe_dfs_root);
}
static int cafe_dfs_open(struct inode *inode, struct file *file)
{
file->private_data = inode->i_private;
return 0;
}
static ssize_t cafe_dfs_read_regs(struct file *file,
char __user *buf, size_t count, loff_t *ppos)
{
struct cafe_camera *cam = file->private_data;
char *s = cafe_debug_buf;
int offset;
for (offset = 0; offset < 0x44; offset += 4)
s += sprintf(s, "%02x: %08x\n", offset,
cafe_reg_read(cam, offset));
for (offset = 0x88; offset <= 0x90; offset += 4)
s += sprintf(s, "%02x: %08x\n", offset,
cafe_reg_read(cam, offset));
for (offset = 0xb4; offset <= 0xbc; offset += 4)
s += sprintf(s, "%02x: %08x\n", offset,
cafe_reg_read(cam, offset));
for (offset = 0x3000; offset <= 0x300c; offset += 4)
s += sprintf(s, "%04x: %08x\n", offset,
cafe_reg_read(cam, offset));
return simple_read_from_buffer(buf, count, ppos, cafe_debug_buf,
s - cafe_debug_buf);
}
static const struct file_operations cafe_dfs_reg_ops = {
.owner = THIS_MODULE,
.read = cafe_dfs_read_regs,
.open = cafe_dfs_open
};
static ssize_t cafe_dfs_read_cam(struct file *file,
char __user *buf, size_t count, loff_t *ppos)
{
struct cafe_camera *cam = file->private_data;
char *s = cafe_debug_buf;
int offset;
if (! cam->sensor)
return -EINVAL;
for (offset = 0x0; offset < 0x8a; offset++)
{
u8 v;
cafe_smbus_read_data(cam, cam->sensor->addr, offset, &v);
s += sprintf(s, "%02x: %02x\n", offset, v);
}
return simple_read_from_buffer(buf, count, ppos, cafe_debug_buf,
s - cafe_debug_buf);
}
static const struct file_operations cafe_dfs_cam_ops = {
.owner = THIS_MODULE,
.read = cafe_dfs_read_cam,
.open = cafe_dfs_open
};
static void cafe_dfs_cam_setup(struct cafe_camera *cam)
{
char fname[40];
if (!cafe_dfs_root)
return;
sprintf(fname, "regs-%d", cam->v4ldev.minor);
cam->dfs_regs = debugfs_create_file(fname, 0444, cafe_dfs_root,
cam, &cafe_dfs_reg_ops);
sprintf(fname, "cam-%d", cam->v4ldev.minor);
cam->dfs_cam_regs = debugfs_create_file(fname, 0444, cafe_dfs_root,
cam, &cafe_dfs_cam_ops);
}
static void cafe_dfs_cam_shutdown(struct cafe_camera *cam)
{
if (! IS_ERR(cam->dfs_regs))
debugfs_remove(cam->dfs_regs);
if (! IS_ERR(cam->dfs_cam_regs))
debugfs_remove(cam->dfs_cam_regs);
}
#else
#define cafe_dfs_setup()
#define cafe_dfs_shutdown()
#define cafe_dfs_cam_setup(cam)
#define cafe_dfs_cam_shutdown(cam)
#endif /* CONFIG_VIDEO_ADV_DEBUG */
/* ------------------------------------------------------------------------*/
/*
* PCI interface stuff.
*/
static int cafe_pci_probe(struct pci_dev *pdev,
const struct pci_device_id *id)
{
int ret;
u16 classword;
struct cafe_camera *cam;
/*
* Make sure we have a camera here - we'll get calls for
* the other cafe devices as well.
*/
pci_read_config_word(pdev, PCI_CLASS_DEVICE, &classword);
if (classword != PCI_CLASS_MULTIMEDIA_VIDEO)
return -ENODEV;
/*
* Start putting together one of our big camera structures.
*/
ret = -ENOMEM;
cam = kzalloc(sizeof(struct cafe_camera), GFP_KERNEL);
if (cam == NULL)
goto out;
mutex_init(&cam->s_mutex);
mutex_lock(&cam->s_mutex);
spin_lock_init(&cam->dev_lock);
cam->state = S_NOTREADY;
cafe_set_config_needed(cam, 1);
init_waitqueue_head(&cam->smbus_wait);
init_waitqueue_head(&cam->iowait);
cam->pdev = pdev;
cam->pix_format = cafe_def_pix_format;
INIT_LIST_HEAD(&cam->dev_list);
INIT_LIST_HEAD(&cam->sb_avail);
INIT_LIST_HEAD(&cam->sb_full);
tasklet_init(&cam->s_tasklet, cafe_frame_tasklet, (unsigned long) cam);
/*
* Get set up on the PCI bus.
*/
ret = pci_enable_device(pdev);
if (ret)
goto out_free;
pci_set_master(pdev);
ret = -EIO;
cam->regs = pci_iomap(pdev, 0, 0);
if (! cam->regs) {
printk(KERN_ERR "Unable to ioremap cafe-ccic regs\n");
goto out_free;
}
ret = request_irq(pdev->irq, cafe_irq, IRQF_SHARED, "cafe-ccic", cam);
if (ret)
goto out_iounmap;
cafe_ctlr_init(cam);
cafe_ctlr_power_up(cam);
/*
* Set up I2C/SMBUS communications
*/
mutex_unlock(&cam->s_mutex); /* attach can deadlock */
ret = cafe_smbus_setup(cam);
if (ret)
goto out_freeirq;
/*
* Get the v4l2 setup done.
*/
mutex_lock(&cam->s_mutex);
cam->v4ldev = cafe_v4l_template;
cam->v4ldev.debug = 0;
// cam->v4ldev.debug = V4L2_DEBUG_IOCTL_ARG;
ret = video_register_device(&cam->v4ldev, VFL_TYPE_GRABBER, -1);
if (ret)
goto out_smbus;
/*
* If so requested, try to get our DMA buffers now.
*/
if (alloc_bufs_at_load) {
if (cafe_alloc_dma_bufs(cam, 1))
cam_warn(cam, "Unable to alloc DMA buffers at load"
" will try again later.");
}
cafe_dfs_cam_setup(cam);
mutex_unlock(&cam->s_mutex);
cafe_add_dev(cam);
return 0;
out_smbus:
cafe_smbus_shutdown(cam);
out_freeirq:
cafe_ctlr_power_down(cam);
free_irq(pdev->irq, cam);
out_iounmap:
pci_iounmap(pdev, cam->regs);
out_free:
kfree(cam);
out:
return ret;
}
/*
* Shut down an initialized device
*/
static void cafe_shutdown(struct cafe_camera *cam)
{
/* FIXME: Make sure we take care of everything here */
cafe_dfs_cam_shutdown(cam);
if (cam->n_sbufs > 0)
/* What if they are still mapped? Shouldn't be, but... */
cafe_free_sio_buffers(cam);
cafe_remove_dev(cam);
cafe_ctlr_stop_dma(cam);
cafe_ctlr_power_down(cam);
cafe_smbus_shutdown(cam);
cafe_free_dma_bufs(cam);
free_irq(cam->pdev->irq, cam);
pci_iounmap(cam->pdev, cam->regs);
video_unregister_device(&cam->v4ldev);
/* kfree(cam); done in v4l_release () */
}
static void cafe_pci_remove(struct pci_dev *pdev)
{
struct cafe_camera *cam = cafe_find_by_pdev(pdev);
if (cam == NULL) {
printk(KERN_WARNING "pci_remove on unknown pdev %p\n", pdev);
return;
}
mutex_lock(&cam->s_mutex);
if (cam->users > 0)
cam_warn(cam, "Removing a device with users!\n");
cafe_shutdown(cam);
/* No unlock - it no longer exists */
}
static struct pci_device_id cafe_ids[] = {
{ PCI_DEVICE(0x1148, 0x4340) }, /* Temporary ID on devel board */
{ PCI_DEVICE(0x11ab, 0x4100) }, /* Eventual real ID */
{ PCI_DEVICE(0x11ab, 0x4102) }, /* Really eventual real ID */
{ 0, }
};
MODULE_DEVICE_TABLE(pci, cafe_ids);
static struct pci_driver cafe_pci_driver = {
.name = "cafe1000-ccic",
.id_table = cafe_ids,
.probe = cafe_pci_probe,
.remove = cafe_pci_remove,
};
static int __init cafe_init(void)
{
int ret;
printk(KERN_NOTICE "Marvell M88ALP01 'CAFE' Camera Controller version %d\n",
CAFE_VERSION);
cafe_dfs_setup();
ret = pci_register_driver(&cafe_pci_driver);
if (ret) {
printk(KERN_ERR "Unable to register cafe_ccic driver\n");
goto out;
}
request_module("ov7670"); /* FIXME want something more general */
ret = 0;
out:
return ret;
}
static void __exit cafe_exit(void)
{
pci_unregister_driver(&cafe_pci_driver);
cafe_dfs_shutdown();
}
module_init(cafe_init);
module_exit(cafe_exit);
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