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linux/drivers/media/video/pxa_camera.c
Guennadi Liakhovetski 1a0063a985 V4L/DVB (7501): soc-camera: use a spinlock for videobuffer queue 
All drivers should provide a spinlock to be used in videobuf operations.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@pengutronix.de>
Reviewed-by: Brandon Philips <bphilips@suse.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-04-24 14:07:57 -03:00

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/*
* V4L2 Driver for PXA camera host
*
* Copyright (C) 2006, Sascha Hauer, Pengutronix
* Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/io.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/moduleparam.h>
#include <linux/time.h>
#include <linux/version.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/mutex.h>
#include <linux/clk.h>
#include <media/v4l2-common.h>
#include <media/v4l2-dev.h>
#include <media/soc_camera.h>
#include <linux/videodev2.h>
#include <asm/dma.h>
#include <asm/arch/pxa-regs.h>
#include <asm/arch/camera.h>
#define PXA_CAM_VERSION_CODE KERNEL_VERSION(0, 0, 5)
#define PXA_CAM_DRV_NAME "pxa27x-camera"
#define CICR0_SIM_MP (0 << 24)
#define CICR0_SIM_SP (1 << 24)
#define CICR0_SIM_MS (2 << 24)
#define CICR0_SIM_EP (3 << 24)
#define CICR0_SIM_ES (4 << 24)
#define CICR1_DW_VAL(x) ((x) & CICR1_DW) /* Data bus width */
#define CICR1_PPL_VAL(x) (((x) << 15) & CICR1_PPL) /* Pixels per line */
#define CICR2_BLW_VAL(x) (((x) << 24) & CICR2_BLW) /* Beginning-of-line pixel clock wait count */
#define CICR2_ELW_VAL(x) (((x) << 16) & CICR2_ELW) /* End-of-line pixel clock wait count */
#define CICR2_HSW_VAL(x) (((x) << 10) & CICR2_HSW) /* Horizontal sync pulse width */
#define CICR2_BFPW_VAL(x) (((x) << 3) & CICR2_BFPW) /* Beginning-of-frame pixel clock wait count */
#define CICR2_FSW_VAL(x) (((x) << 0) & CICR2_FSW) /* Frame stabilization wait count */
#define CICR3_BFW_VAL(x) (((x) << 24) & CICR3_BFW) /* Beginning-of-frame line clock wait count */
#define CICR3_EFW_VAL(x) (((x) << 16) & CICR3_EFW) /* End-of-frame line clock wait count */
#define CICR3_VSW_VAL(x) (((x) << 11) & CICR3_VSW) /* Vertical sync pulse width */
#define CICR3_LPF_VAL(x) (((x) << 0) & CICR3_LPF) /* Lines per frame */
#define CICR0_IRQ_MASK (CICR0_TOM | CICR0_RDAVM | CICR0_FEM | CICR0_EOLM | \
CICR0_PERRM | CICR0_QDM | CICR0_CDM | CICR0_SOFM | \
CICR0_EOFM | CICR0_FOM)
static DEFINE_MUTEX(camera_lock);
/*
* Structures
*/
/* buffer for one video frame */
struct pxa_buffer {
/* common v4l buffer stuff -- must be first */
struct videobuf_buffer vb;
const struct soc_camera_data_format *fmt;
/* our descriptor list needed for the PXA DMA engine */
dma_addr_t sg_dma;
struct pxa_dma_desc *sg_cpu;
size_t sg_size;
int inwork;
};
struct pxa_framebuffer_queue {
dma_addr_t sg_last_dma;
struct pxa_dma_desc *sg_last_cpu;
};
struct pxa_camera_dev {
struct device *dev;
/* PXA27x is only supposed to handle one camera on its Quick Capture
* interface. If anyone ever builds hardware to enable more than
* one camera, they will have to modify this driver too */
struct soc_camera_device *icd;
struct clk *clk;
unsigned int irq;
void __iomem *base;
unsigned int dma_chan_y;
struct pxacamera_platform_data *pdata;
struct resource *res;
unsigned long platform_flags;
unsigned long platform_mclk_10khz;
struct list_head capture;
spinlock_t lock;
struct pxa_buffer *active;
};
static const char *pxa_cam_driver_description = "PXA_Camera";
static unsigned int vid_limit = 16; /* Video memory limit, in Mb */
/*
* Videobuf operations
*/
static int pxa_videobuf_setup(struct videobuf_queue *vq, unsigned int *count,
unsigned int *size)
{
struct soc_camera_device *icd = vq->priv_data;
dev_dbg(&icd->dev, "count=%d, size=%d\n", *count, *size);
*size = icd->width * icd->height * ((icd->current_fmt->depth + 7) >> 3);
if (0 == *count)
*count = 32;
while (*size * *count > vid_limit * 1024 * 1024)
(*count)--;
return 0;
}
static void free_buffer(struct videobuf_queue *vq, struct pxa_buffer *buf)
{
struct soc_camera_device *icd = vq->priv_data;
struct soc_camera_host *ici =
to_soc_camera_host(icd->dev.parent);
struct pxa_camera_dev *pcdev = ici->priv;
struct videobuf_dmabuf *dma = videobuf_to_dma(&buf->vb);
BUG_ON(in_interrupt());
dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %d\n", __FUNCTION__,
&buf->vb, buf->vb.baddr, buf->vb.bsize);
/* This waits until this buffer is out of danger, i.e., until it is no
* longer in STATE_QUEUED or STATE_ACTIVE */
videobuf_waiton(&buf->vb, 0, 0);
videobuf_dma_unmap(vq, dma);
videobuf_dma_free(dma);
if (buf->sg_cpu)
dma_free_coherent(pcdev->dev, buf->sg_size, buf->sg_cpu,
buf->sg_dma);
buf->sg_cpu = NULL;
buf->vb.state = VIDEOBUF_NEEDS_INIT;
}
static int pxa_videobuf_prepare(struct videobuf_queue *vq,
struct videobuf_buffer *vb, enum v4l2_field field)
{
struct soc_camera_device *icd = vq->priv_data;
struct soc_camera_host *ici =
to_soc_camera_host(icd->dev.parent);
struct pxa_camera_dev *pcdev = ici->priv;
struct pxa_buffer *buf = container_of(vb, struct pxa_buffer, vb);
int i, ret;
dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %d\n", __FUNCTION__,
vb, vb->baddr, vb->bsize);
/* Added list head initialization on alloc */
WARN_ON(!list_empty(&vb->queue));
#ifdef DEBUG
/* This can be useful if you want to see if we actually fill
* the buffer with something */
memset((void *)vb->baddr, 0xaa, vb->bsize);
#endif
BUG_ON(NULL == icd->current_fmt);
/* I think, in buf_prepare you only have to protect global data,
* the actual buffer is yours */
buf->inwork = 1;
if (buf->fmt != icd->current_fmt ||
vb->width != icd->width ||
vb->height != icd->height ||
vb->field != field) {
buf->fmt = icd->current_fmt;
vb->width = icd->width;
vb->height = icd->height;
vb->field = field;
vb->state = VIDEOBUF_NEEDS_INIT;
}
vb->size = vb->width * vb->height * ((buf->fmt->depth + 7) >> 3);
if (0 != vb->baddr && vb->bsize < vb->size) {
ret = -EINVAL;
goto out;
}
if (vb->state == VIDEOBUF_NEEDS_INIT) {
unsigned int size = vb->size;
struct videobuf_dmabuf *dma = videobuf_to_dma(vb);
ret = videobuf_iolock(vq, vb, NULL);
if (ret)
goto fail;
if (buf->sg_cpu)
dma_free_coherent(pcdev->dev, buf->sg_size, buf->sg_cpu,
buf->sg_dma);
buf->sg_size = (dma->sglen + 1) * sizeof(struct pxa_dma_desc);
buf->sg_cpu = dma_alloc_coherent(pcdev->dev, buf->sg_size,
&buf->sg_dma, GFP_KERNEL);
if (!buf->sg_cpu) {
ret = -ENOMEM;
goto fail;
}
dev_dbg(&icd->dev, "nents=%d size: %d sg=0x%p\n",
dma->sglen, size, dma->sglist);
for (i = 0; i < dma->sglen; i++) {
struct scatterlist *sg = dma->sglist;
unsigned int dma_len = sg_dma_len(&sg[i]), xfer_len;
/* CIBR0 */
buf->sg_cpu[i].dsadr = pcdev->res->start + 0x28;
buf->sg_cpu[i].dtadr = sg_dma_address(&sg[i]);
/* PXA270 Developer's Manual 27.4.4.1:
* round up to 8 bytes */
xfer_len = (min(dma_len, size) + 7) & ~7;
if (xfer_len & 7)
dev_err(&icd->dev, "Unaligned buffer: "
"dma_len %u, size %u\n", dma_len, size);
buf->sg_cpu[i].dcmd = DCMD_FLOWSRC | DCMD_BURST8 |
DCMD_INCTRGADDR | xfer_len;
size -= dma_len;
buf->sg_cpu[i].ddadr = buf->sg_dma + (i + 1) *
sizeof(struct pxa_dma_desc);
}
buf->sg_cpu[dma->sglen - 1].ddadr = DDADR_STOP;
buf->sg_cpu[dma->sglen - 1].dcmd |= DCMD_ENDIRQEN;
vb->state = VIDEOBUF_PREPARED;
}
buf->inwork = 0;
return 0;
fail:
free_buffer(vq, buf);
out:
buf->inwork = 0;
return ret;
}
static void pxa_videobuf_queue(struct videobuf_queue *vq,
struct videobuf_buffer *vb)
{
struct soc_camera_device *icd = vq->priv_data;
struct soc_camera_host *ici =
to_soc_camera_host(icd->dev.parent);
struct pxa_camera_dev *pcdev = ici->priv;
struct pxa_buffer *buf = container_of(vb, struct pxa_buffer, vb);
struct pxa_buffer *active;
struct videobuf_dmabuf *dma = videobuf_to_dma(vb);
int nents = dma->sglen;
unsigned long flags;
dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %d\n", __FUNCTION__,
vb, vb->baddr, vb->bsize);
spin_lock_irqsave(&pcdev->lock, flags);
list_add_tail(&vb->queue, &pcdev->capture);
vb->state = VIDEOBUF_ACTIVE;
active = pcdev->active;
if (!active) {
CIFR |= CIFR_RESET_F;
DDADR(pcdev->dma_chan_y) = buf->sg_dma;
DCSR(pcdev->dma_chan_y) = DCSR_RUN;
pcdev->active = buf;
CICR0 |= CICR0_ENB;
} else {
struct videobuf_dmabuf *active_dma =
videobuf_to_dma(&active->vb);
/* Stop DMA engine */
DCSR(pcdev->dma_chan_y) = 0;
/* Add the descriptors we just initialized to the currently
* running chain
*/
active->sg_cpu[active_dma->sglen - 1].ddadr = buf->sg_dma;
/* Setup a dummy descriptor with the DMA engines current
* state
*/
/* CIBR0 */
buf->sg_cpu[nents].dsadr = pcdev->res->start + 0x28;
buf->sg_cpu[nents].dtadr = DTADR(pcdev->dma_chan_y);
buf->sg_cpu[nents].dcmd = DCMD(pcdev->dma_chan_y);
if (DDADR(pcdev->dma_chan_y) == DDADR_STOP) {
/* The DMA engine is on the last descriptor, set the
* next descriptors address to the descriptors
* we just initialized
*/
buf->sg_cpu[nents].ddadr = buf->sg_dma;
} else {
buf->sg_cpu[nents].ddadr = DDADR(pcdev->dma_chan_y);
}
/* The next descriptor is the dummy descriptor */
DDADR(pcdev->dma_chan_y) = buf->sg_dma + nents *
sizeof(struct pxa_dma_desc);
#ifdef DEBUG
if (CISR & CISR_IFO_0) {
dev_warn(pcdev->dev, "FIFO overrun\n");
DDADR(pcdev->dma_chan_y) = pcdev->active->sg_dma;
CICR0 &= ~CICR0_ENB;
CIFR |= CIFR_RESET_F;
DCSR(pcdev->dma_chan_y) = DCSR_RUN;
CICR0 |= CICR0_ENB;
} else
#endif
DCSR(pcdev->dma_chan_y) = DCSR_RUN;
}
spin_unlock_irqrestore(&pcdev->lock, flags);
}
static void pxa_videobuf_release(struct videobuf_queue *vq,
struct videobuf_buffer *vb)
{
struct pxa_buffer *buf = container_of(vb, struct pxa_buffer, vb);
#ifdef DEBUG
struct soc_camera_device *icd = vq->priv_data;
dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %d\n", __FUNCTION__,
vb, vb->baddr, vb->bsize);
switch (vb->state) {
case VIDEOBUF_ACTIVE:
dev_dbg(&icd->dev, "%s (active)\n", __FUNCTION__);
break;
case VIDEOBUF_QUEUED:
dev_dbg(&icd->dev, "%s (queued)\n", __FUNCTION__);
break;
case VIDEOBUF_PREPARED:
dev_dbg(&icd->dev, "%s (prepared)\n", __FUNCTION__);
break;
default:
dev_dbg(&icd->dev, "%s (unknown)\n", __FUNCTION__);
break;
}
#endif
free_buffer(vq, buf);
}
static void pxa_camera_dma_irq_y(int channel, void *data)
{
struct pxa_camera_dev *pcdev = data;
struct pxa_buffer *buf;
unsigned long flags;
unsigned int status;
struct videobuf_buffer *vb;
spin_lock_irqsave(&pcdev->lock, flags);
status = DCSR(pcdev->dma_chan_y);
DCSR(pcdev->dma_chan_y) = status;
if (status & DCSR_BUSERR) {
dev_err(pcdev->dev, "DMA Bus Error IRQ!\n");
goto out;
}
if (!(status & DCSR_ENDINTR)) {
dev_err(pcdev->dev, "Unknown DMA IRQ source, "
"status: 0x%08x\n", status);
goto out;
}
if (!pcdev->active) {
dev_err(pcdev->dev, "DMA End IRQ with no active buffer!\n");
goto out;
}
vb = &pcdev->active->vb;
buf = container_of(vb, struct pxa_buffer, vb);
WARN_ON(buf->inwork || list_empty(&vb->queue));
dev_dbg(pcdev->dev, "%s (vb=0x%p) 0x%08lx %d\n", __FUNCTION__,
vb, vb->baddr, vb->bsize);
/* _init is used to debug races, see comment in pxa_camera_reqbufs() */
list_del_init(&vb->queue);
vb->state = VIDEOBUF_DONE;
do_gettimeofday(&vb->ts);
vb->field_count++;
wake_up(&vb->done);
if (list_empty(&pcdev->capture)) {
pcdev->active = NULL;
DCSR(pcdev->dma_chan_y) = 0;
CICR0 &= ~CICR0_ENB;
goto out;
}
pcdev->active = list_entry(pcdev->capture.next, struct pxa_buffer,
vb.queue);
out:
spin_unlock_irqrestore(&pcdev->lock, flags);
}
static struct videobuf_queue_ops pxa_videobuf_ops = {
.buf_setup = pxa_videobuf_setup,
.buf_prepare = pxa_videobuf_prepare,
.buf_queue = pxa_videobuf_queue,
.buf_release = pxa_videobuf_release,
};
static int mclk_get_divisor(struct pxa_camera_dev *pcdev)
{
unsigned int mclk_10khz = pcdev->platform_mclk_10khz;
unsigned long div;
unsigned long lcdclk;
lcdclk = clk_get_rate(pcdev->clk) / 10000;
/* We verify platform_mclk_10khz != 0, so if anyone breaks it, here
* they get a nice Oops */
div = (lcdclk + 2 * mclk_10khz - 1) / (2 * mclk_10khz) - 1;
dev_dbg(pcdev->dev, "LCD clock %lukHz, target freq %dkHz, "
"divisor %lu\n", lcdclk * 10, mclk_10khz * 10, div);
return div;
}
static void pxa_camera_activate(struct pxa_camera_dev *pcdev)
{
struct pxacamera_platform_data *pdata = pcdev->pdata;
u32 cicr4 = 0;
dev_dbg(pcdev->dev, "Registered platform device at %p data %p\n",
pcdev, pdata);
if (pdata && pdata->init) {
dev_dbg(pcdev->dev, "%s: Init gpios\n", __FUNCTION__);
pdata->init(pcdev->dev);
}
if (pdata && pdata->power) {
dev_dbg(pcdev->dev, "%s: Power on camera\n", __FUNCTION__);
pdata->power(pcdev->dev, 1);
}
if (pdata && pdata->reset) {
dev_dbg(pcdev->dev, "%s: Releasing camera reset\n",
__FUNCTION__);
pdata->reset(pcdev->dev, 1);
}
CICR0 = 0x3FF; /* disable all interrupts */
if (pcdev->platform_flags & PXA_CAMERA_PCLK_EN)
cicr4 |= CICR4_PCLK_EN;
if (pcdev->platform_flags & PXA_CAMERA_MCLK_EN)
cicr4 |= CICR4_MCLK_EN;
if (pcdev->platform_flags & PXA_CAMERA_PCP)
cicr4 |= CICR4_PCP;
if (pcdev->platform_flags & PXA_CAMERA_HSP)
cicr4 |= CICR4_HSP;
if (pcdev->platform_flags & PXA_CAMERA_VSP)
cicr4 |= CICR4_VSP;
CICR4 = mclk_get_divisor(pcdev) | cicr4;
clk_enable(pcdev->clk);
}
static void pxa_camera_deactivate(struct pxa_camera_dev *pcdev)
{
struct pxacamera_platform_data *board = pcdev->pdata;
clk_disable(pcdev->clk);
if (board && board->reset) {
dev_dbg(pcdev->dev, "%s: Asserting camera reset\n",
__FUNCTION__);
board->reset(pcdev->dev, 0);
}
if (board && board->power) {
dev_dbg(pcdev->dev, "%s: Power off camera\n", __FUNCTION__);
board->power(pcdev->dev, 0);
}
}
static irqreturn_t pxa_camera_irq(int irq, void *data)
{
struct pxa_camera_dev *pcdev = data;
unsigned int status = CISR;
dev_dbg(pcdev->dev, "Camera interrupt status 0x%x\n", status);
CISR = status;
return IRQ_HANDLED;
}
/* The following two functions absolutely depend on the fact, that
* there can be only one camera on PXA quick capture interface */
static int pxa_camera_add_device(struct soc_camera_device *icd)
{
struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
struct pxa_camera_dev *pcdev = ici->priv;
int ret;
mutex_lock(&camera_lock);
if (pcdev->icd) {
ret = -EBUSY;
goto ebusy;
}
dev_info(&icd->dev, "PXA Camera driver attached to camera %d\n",
icd->devnum);
pxa_camera_activate(pcdev);
ret = icd->ops->init(icd);
if (!ret)
pcdev->icd = icd;
ebusy:
mutex_unlock(&camera_lock);
return ret;
}
static void pxa_camera_remove_device(struct soc_camera_device *icd)
{
struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
struct pxa_camera_dev *pcdev = ici->priv;
BUG_ON(icd != pcdev->icd);
dev_info(&icd->dev, "PXA Camera driver detached from camera %d\n",
icd->devnum);
/* disable capture, disable interrupts */
CICR0 = 0x3ff;
/* Stop DMA engine */
DCSR(pcdev->dma_chan_y) = 0;
icd->ops->release(icd);
pxa_camera_deactivate(pcdev);
pcdev->icd = NULL;
}
static int test_platform_param(struct pxa_camera_dev *pcdev,
unsigned char buswidth, unsigned long *flags)
{
/*
* Platform specified synchronization and pixel clock polarities are
* only a recommendation and are only used during probing. The PXA270
* quick capture interface supports both.
*/
*flags = (pcdev->platform_flags & PXA_CAMERA_MASTER ?
SOCAM_MASTER : SOCAM_SLAVE) |
SOCAM_HSYNC_ACTIVE_HIGH |
SOCAM_HSYNC_ACTIVE_LOW |
SOCAM_VSYNC_ACTIVE_HIGH |
SOCAM_VSYNC_ACTIVE_LOW |
SOCAM_PCLK_SAMPLE_RISING |
SOCAM_PCLK_SAMPLE_FALLING;
/* If requested data width is supported by the platform, use it */
switch (buswidth) {
case 10:
if (!(pcdev->platform_flags & PXA_CAMERA_DATAWIDTH_10))
return -EINVAL;
*flags |= SOCAM_DATAWIDTH_10;
break;
case 9:
if (!(pcdev->platform_flags & PXA_CAMERA_DATAWIDTH_9))
return -EINVAL;
*flags |= SOCAM_DATAWIDTH_9;
break;
case 8:
if (!(pcdev->platform_flags & PXA_CAMERA_DATAWIDTH_8))
return -EINVAL;
*flags |= SOCAM_DATAWIDTH_8;
}
return 0;
}
static int pxa_camera_set_bus_param(struct soc_camera_device *icd, __u32 pixfmt)
{
struct soc_camera_host *ici =
to_soc_camera_host(icd->dev.parent);
struct pxa_camera_dev *pcdev = ici->priv;
unsigned long dw, bpp, bus_flags, camera_flags, common_flags;
u32 cicr0, cicr4 = 0;
int ret = test_platform_param(pcdev, icd->buswidth, &bus_flags);
if (ret < 0)
return ret;
camera_flags = icd->ops->query_bus_param(icd);
common_flags = soc_camera_bus_param_compatible(camera_flags, bus_flags);
if (!common_flags)
return -EINVAL;
/* Make choises, based on platform preferences */
if ((common_flags & SOCAM_HSYNC_ACTIVE_HIGH) &&
(common_flags & SOCAM_HSYNC_ACTIVE_LOW)) {
if (pcdev->platform_flags & PXA_CAMERA_HSP)
common_flags &= ~SOCAM_HSYNC_ACTIVE_HIGH;
else
common_flags &= ~SOCAM_HSYNC_ACTIVE_LOW;
}
if ((common_flags & SOCAM_VSYNC_ACTIVE_HIGH) &&
(common_flags & SOCAM_VSYNC_ACTIVE_LOW)) {
if (pcdev->platform_flags & PXA_CAMERA_VSP)
common_flags &= ~SOCAM_VSYNC_ACTIVE_HIGH;
else
common_flags &= ~SOCAM_VSYNC_ACTIVE_LOW;
}
if ((common_flags & SOCAM_PCLK_SAMPLE_RISING) &&
(common_flags & SOCAM_PCLK_SAMPLE_FALLING)) {
if (pcdev->platform_flags & PXA_CAMERA_PCP)
common_flags &= ~SOCAM_PCLK_SAMPLE_RISING;
else
common_flags &= ~SOCAM_PCLK_SAMPLE_FALLING;
}
ret = icd->ops->set_bus_param(icd, common_flags);
if (ret < 0)
return ret;
/* Datawidth is now guaranteed to be equal to one of the three values.
* We fix bit-per-pixel equal to data-width... */
switch (common_flags & SOCAM_DATAWIDTH_MASK) {
case SOCAM_DATAWIDTH_10:
icd->buswidth = 10;
dw = 4;
bpp = 0x40;
break;
case SOCAM_DATAWIDTH_9:
icd->buswidth = 9;
dw = 3;
bpp = 0x20;
break;
default:
/* Actually it can only be 8 now,
* default is just to silence compiler warnings */
case SOCAM_DATAWIDTH_8:
icd->buswidth = 8;
dw = 2;
bpp = 0;
}
if (pcdev->platform_flags & PXA_CAMERA_PCLK_EN)
cicr4 |= CICR4_PCLK_EN;
if (pcdev->platform_flags & PXA_CAMERA_MCLK_EN)
cicr4 |= CICR4_MCLK_EN;
if (common_flags & SOCAM_PCLK_SAMPLE_FALLING)
cicr4 |= CICR4_PCP;
if (common_flags & SOCAM_HSYNC_ACTIVE_LOW)
cicr4 |= CICR4_HSP;
if (common_flags & SOCAM_VSYNC_ACTIVE_LOW)
cicr4 |= CICR4_VSP;
cicr0 = CICR0;
if (cicr0 & CICR0_ENB)
CICR0 = cicr0 & ~CICR0_ENB;
CICR1 = CICR1_PPL_VAL(icd->width - 1) | bpp | dw;
CICR2 = 0;
CICR3 = CICR3_LPF_VAL(icd->height - 1) |
CICR3_BFW_VAL(min((unsigned short)255, icd->y_skip_top));
CICR4 = mclk_get_divisor(pcdev) | cicr4;
/* CIF interrupts are not used, only DMA */
CICR0 = (pcdev->platform_flags & PXA_CAMERA_MASTER ?
CICR0_SIM_MP : (CICR0_SL_CAP_EN | CICR0_SIM_SP)) |
CICR0_DMAEN | CICR0_IRQ_MASK | (cicr0 & CICR0_ENB);
return 0;
}
static int pxa_camera_try_bus_param(struct soc_camera_device *icd, __u32 pixfmt)
{
struct soc_camera_host *ici =
to_soc_camera_host(icd->dev.parent);
struct pxa_camera_dev *pcdev = ici->priv;
unsigned long bus_flags, camera_flags;
int ret = test_platform_param(pcdev, icd->buswidth, &bus_flags);
if (ret < 0)
return ret;
camera_flags = icd->ops->query_bus_param(icd);
return soc_camera_bus_param_compatible(camera_flags, bus_flags) ? 0 : -EINVAL;
}
static int pxa_camera_set_fmt_cap(struct soc_camera_device *icd,
__u32 pixfmt, struct v4l2_rect *rect)
{
return icd->ops->set_fmt_cap(icd, pixfmt, rect);
}
static int pxa_camera_try_fmt_cap(struct soc_camera_device *icd,
struct v4l2_format *f)
{
/* limit to pxa hardware capabilities */
if (f->fmt.pix.height < 32)
f->fmt.pix.height = 32;
if (f->fmt.pix.height > 2048)
f->fmt.pix.height = 2048;
if (f->fmt.pix.width < 48)
f->fmt.pix.width = 48;
if (f->fmt.pix.width > 2048)
f->fmt.pix.width = 2048;
f->fmt.pix.width &= ~0x01;
/* limit to sensor capabilities */
return icd->ops->try_fmt_cap(icd, f);
}
static int pxa_camera_reqbufs(struct soc_camera_file *icf,
struct v4l2_requestbuffers *p)
{
int i;
/* This is for locking debugging only. I removed spinlocks and now I
* check whether .prepare is ever called on a linked buffer, or whether
* a dma IRQ can occur for an in-work or unlinked buffer. Until now
* it hadn't triggered */
for (i = 0; i < p->count; i++) {
struct pxa_buffer *buf = container_of(icf->vb_vidq.bufs[i],
struct pxa_buffer, vb);
buf->inwork = 0;
INIT_LIST_HEAD(&buf->vb.queue);
}
return 0;
}
static unsigned int pxa_camera_poll(struct file *file, poll_table *pt)
{
struct soc_camera_file *icf = file->private_data;
struct pxa_buffer *buf;
buf = list_entry(icf->vb_vidq.stream.next, struct pxa_buffer,
vb.stream);
poll_wait(file, &buf->vb.done, pt);
if (buf->vb.state == VIDEOBUF_DONE ||
buf->vb.state == VIDEOBUF_ERROR)
return POLLIN|POLLRDNORM;
return 0;
}
static int pxa_camera_querycap(struct soc_camera_host *ici,
struct v4l2_capability *cap)
{
/* cap->name is set by the firendly caller:-> */
strlcpy(cap->card, pxa_cam_driver_description, sizeof(cap->card));
cap->version = PXA_CAM_VERSION_CODE;
cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
return 0;
}
static spinlock_t *pxa_camera_spinlock_alloc(struct soc_camera_file *icf)
{
struct soc_camera_host *ici =
to_soc_camera_host(icf->icd->dev.parent);
struct pxa_camera_dev *pcdev = ici->priv;
return &pcdev->lock;
}
static struct soc_camera_host_ops pxa_soc_camera_host_ops = {
.owner = THIS_MODULE,
.add = pxa_camera_add_device,
.remove = pxa_camera_remove_device,
.set_fmt_cap = pxa_camera_set_fmt_cap,
.try_fmt_cap = pxa_camera_try_fmt_cap,
.reqbufs = pxa_camera_reqbufs,
.poll = pxa_camera_poll,
.querycap = pxa_camera_querycap,
.try_bus_param = pxa_camera_try_bus_param,
.set_bus_param = pxa_camera_set_bus_param,
.spinlock_alloc = pxa_camera_spinlock_alloc,
};
/* Should be allocated dynamically too, but we have only one. */
static struct soc_camera_host pxa_soc_camera_host = {
.drv_name = PXA_CAM_DRV_NAME,
.vbq_ops = &pxa_videobuf_ops,
.msize = sizeof(struct pxa_buffer),
.ops = &pxa_soc_camera_host_ops,
};
static int pxa_camera_probe(struct platform_device *pdev)
{
struct pxa_camera_dev *pcdev;
struct resource *res;
void __iomem *base;
unsigned int irq;
int err = 0;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
irq = platform_get_irq(pdev, 0);
if (!res || !irq) {
err = -ENODEV;
goto exit;
}
pcdev = kzalloc(sizeof(*pcdev), GFP_KERNEL);
if (!pcdev) {
dev_err(&pdev->dev, "Could not allocate pcdev\n");
err = -ENOMEM;
goto exit;
}
pcdev->clk = clk_get(&pdev->dev, "CAMCLK");
if (IS_ERR(pcdev->clk)) {
err = PTR_ERR(pcdev->clk);
goto exit_kfree;
}
dev_set_drvdata(&pdev->dev, pcdev);
pcdev->res = res;
pcdev->pdata = pdev->dev.platform_data;
pcdev->platform_flags = pcdev->pdata->flags;
if (!(pcdev->platform_flags & (PXA_CAMERA_DATAWIDTH_8 |
PXA_CAMERA_DATAWIDTH_9 | PXA_CAMERA_DATAWIDTH_10))) {
/* Platform hasn't set available data widths. This is bad.
* Warn and use a default. */
dev_warn(&pdev->dev, "WARNING! Platform hasn't set available "
"data widths, using default 10 bit\n");
pcdev->platform_flags |= PXA_CAMERA_DATAWIDTH_10;
}
pcdev->platform_mclk_10khz = pcdev->pdata->mclk_10khz;
if (!pcdev->platform_mclk_10khz) {
dev_warn(&pdev->dev,
"mclk_10khz == 0! Please, fix your platform data. "
"Using default 20MHz\n");
pcdev->platform_mclk_10khz = 2000;
}
INIT_LIST_HEAD(&pcdev->capture);
spin_lock_init(&pcdev->lock);
/*
* Request the regions.
*/
if (!request_mem_region(res->start, res->end - res->start + 1,
PXA_CAM_DRV_NAME)) {
err = -EBUSY;
goto exit_clk;
}
base = ioremap(res->start, res->end - res->start + 1);
if (!base) {
err = -ENOMEM;
goto exit_release;
}
pcdev->irq = irq;
pcdev->base = base;
pcdev->dev = &pdev->dev;
/* request dma */
pcdev->dma_chan_y = pxa_request_dma("CI_Y", DMA_PRIO_HIGH,
pxa_camera_dma_irq_y, pcdev);
if (pcdev->dma_chan_y < 0) {
dev_err(pcdev->dev, "Can't request DMA for Y\n");
err = -ENOMEM;
goto exit_iounmap;
}
dev_dbg(pcdev->dev, "got DMA channel %d\n", pcdev->dma_chan_y);
DRCMR68 = pcdev->dma_chan_y | DRCMR_MAPVLD;
/* request irq */
err = request_irq(pcdev->irq, pxa_camera_irq, 0, PXA_CAM_DRV_NAME,
pcdev);
if (err) {
dev_err(pcdev->dev, "Camera interrupt register failed \n");
goto exit_free_dma;
}
pxa_soc_camera_host.priv = pcdev;
pxa_soc_camera_host.dev.parent = &pdev->dev;
pxa_soc_camera_host.nr = pdev->id;
err = soc_camera_host_register(&pxa_soc_camera_host);
if (err)
goto exit_free_irq;
return 0;
exit_free_irq:
free_irq(pcdev->irq, pcdev);
exit_free_dma:
pxa_free_dma(pcdev->dma_chan_y);
exit_iounmap:
iounmap(base);
exit_release:
release_mem_region(res->start, res->end - res->start + 1);
exit_clk:
clk_put(pcdev->clk);
exit_kfree:
kfree(pcdev);
exit:
return err;
}
static int __devexit pxa_camera_remove(struct platform_device *pdev)
{
struct pxa_camera_dev *pcdev = platform_get_drvdata(pdev);
struct resource *res;
clk_put(pcdev->clk);
pxa_free_dma(pcdev->dma_chan_y);
free_irq(pcdev->irq, pcdev);
soc_camera_host_unregister(&pxa_soc_camera_host);
iounmap(pcdev->base);
res = pcdev->res;
release_mem_region(res->start, res->end - res->start + 1);
kfree(pcdev);
dev_info(&pdev->dev, "PXA Camera driver unloaded\n");
return 0;
}
static struct platform_driver pxa_camera_driver = {
.driver = {
.name = PXA_CAM_DRV_NAME,
},
.probe = pxa_camera_probe,
.remove = __exit_p(pxa_camera_remove),
};
static int __devinit pxa_camera_init(void)
{
return platform_driver_register(&pxa_camera_driver);
}
static void __exit pxa_camera_exit(void)
{
return platform_driver_unregister(&pxa_camera_driver);
}
module_init(pxa_camera_init);
module_exit(pxa_camera_exit);
MODULE_DESCRIPTION("PXA27x SoC Camera Host driver");
MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
MODULE_LICENSE("GPL");
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