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V4L/DVB (10088): video: sh_mobile_ceu cleanups and comments

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This patch cleans up the sh_mobile_ceu driver and adds comments and
constants to clarify the magic sequence in sh_mobile_ceu_capture().

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Magnus Damm 2008-12-18 12:50:30 -03:00 committed by Mauro Carvalho Chehab
parent 34d359db7d
commit 7a1a81643f
1 changed files with 28 additions and 21 deletions
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49
drivers/media/video/sh_mobile_ceu_camera.c
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@ -101,13 +101,12 @@ struct sh_mobile_ceu_dev {
};
static void ceu_write(struct sh_mobile_ceu_dev *priv,
unsigned long reg_offs, unsigned long data)
unsigned long reg_offs, u32 data)
{
iowrite32(data, priv->base + reg_offs);
}
static unsigned long ceu_read(struct sh_mobile_ceu_dev *priv,
unsigned long reg_offs)
static u32 ceu_read(struct sh_mobile_ceu_dev *priv, unsigned long reg_offs)
{
return ioread32(priv->base + reg_offs);
}
@ -155,18 +154,26 @@ static void free_buffer(struct videobuf_queue *vq,
buf->vb.state = VIDEOBUF_NEEDS_INIT;
}
#define CEU_CETCR_MAGIC 0x0317f313 /* acknowledge magical interrupt sources */
#define CEU_CETCR_IGRW (1 << 4) /* prohibited register access interrupt bit */
#define CEU_CEIER_CPEIE (1 << 0) /* one-frame capture end interrupt */
#define CEU_CAPCR_CTNCP (1 << 16) /* continuous capture mode (if set) */
static void sh_mobile_ceu_capture(struct sh_mobile_ceu_dev *pcdev)
{
struct soc_camera_device *icd = pcdev->icd;
unsigned long phys_addr;
dma_addr_t phys_addr;
ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) & ~1);
ceu_write(pcdev, CETCR, ~ceu_read(pcdev, CETCR) & 0x0317f313);
ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) | 1);
ceu_write(pcdev, CAPCR, ceu_read(pcdev, CAPCR) & ~0x10000);
ceu_write(pcdev, CETCR, 0x0317f313 ^ 0x10);
/* The hardware is _very_ picky about this sequence. Especially
* the CEU_CETCR_MAGIC value. It seems like we need to acknowledge
* several not-so-well documented interrupt sources in CETCR.
*/
ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) & ~CEU_CEIER_CPEIE);
ceu_write(pcdev, CETCR, ~ceu_read(pcdev, CETCR) & CEU_CETCR_MAGIC);
ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) | CEU_CEIER_CPEIE);
ceu_write(pcdev, CAPCR, ceu_read(pcdev, CAPCR) & ~CEU_CAPCR_CTNCP);
ceu_write(pcdev, CETCR, CEU_CETCR_MAGIC ^ CEU_CETCR_IGRW);
if (!pcdev->active)
return;
@ -179,7 +186,7 @@ static void sh_mobile_ceu_capture(struct sh_mobile_ceu_dev *pcdev)
case V4L2_PIX_FMT_NV21:
case V4L2_PIX_FMT_NV16:
case V4L2_PIX_FMT_NV61:
phys_addr += (icd->width * icd->height);
phys_addr += icd->width * icd->height;
ceu_write(pcdev, CDACR, phys_addr);
}
@ -431,13 +438,13 @@ static int sh_mobile_ceu_set_bus_param(struct soc_camera_device *icd,
}
}
if ((icd->current_fmt->fourcc == V4L2_PIX_FMT_NV21) ||
(icd->current_fmt->fourcc == V4L2_PIX_FMT_NV61))
if (icd->current_fmt->fourcc == V4L2_PIX_FMT_NV21 ||
icd->current_fmt->fourcc == V4L2_PIX_FMT_NV61)
value ^= 0x00000100; /* swap U, V to change from NV1x->NVx1 */
value |= (common_flags & SOCAM_VSYNC_ACTIVE_LOW) ? (1 << 1) : 0;
value |= (common_flags & SOCAM_HSYNC_ACTIVE_LOW) ? (1 << 0) : 0;
value |= (buswidth == 16) ? (1 << 12) : 0;
value |= common_flags & SOCAM_VSYNC_ACTIVE_LOW ? 1 << 1 : 0;
value |= common_flags & SOCAM_HSYNC_ACTIVE_LOW ? 1 << 0 : 0;
value |= buswidth == 16 ? 1 << 12 : 0;
ceu_write(pcdev, CAMCR, value);
ceu_write(pcdev, CAPCR, 0x00300000);
@ -447,13 +454,13 @@ static int sh_mobile_ceu_set_bus_param(struct soc_camera_device *icd,
if (yuv_mode) {
width = icd->width * 2;
width = (buswidth == 16) ? width / 2 : width;
width = buswidth == 16 ? width / 2 : width;
cfszr_width = cdwdr_width = icd->width;
} else {
width = icd->width * ((icd->current_fmt->depth + 7) >> 3);
width = (buswidth == 16) ? width / 2 : width;
cfszr_width = (buswidth == 8) ? width / 2 : width;
cdwdr_width = (buswidth == 16) ? width * 2 : width;
width = buswidth == 16 ? width / 2 : width;
cfszr_width = buswidth == 8 ? width / 2 : width;
cdwdr_width = buswidth == 16 ? width * 2 : width;
}
ceu_write(pcdev, CAMOR, 0);