V4L/DVB (10088): video: sh_mobile_ceu cleanups and comments
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>
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@ -101,13 +101,12 @@ struct sh_mobile_ceu_dev {
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};
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static void ceu_write(struct sh_mobile_ceu_dev *priv,
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unsigned long reg_offs, unsigned long data)
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unsigned long reg_offs, u32 data)
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{
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iowrite32(data, priv->base + reg_offs);
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}
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static unsigned long ceu_read(struct sh_mobile_ceu_dev *priv,
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unsigned long reg_offs)
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static u32 ceu_read(struct sh_mobile_ceu_dev *priv, unsigned long reg_offs)
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{
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return ioread32(priv->base + reg_offs);
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}
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@ -155,18 +154,26 @@ static void free_buffer(struct videobuf_queue *vq,
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buf->vb.state = VIDEOBUF_NEEDS_INIT;
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}
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#define CEU_CETCR_MAGIC 0x0317f313 /* acknowledge magical interrupt sources */
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#define CEU_CETCR_IGRW (1 << 4) /* prohibited register access interrupt bit */
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#define CEU_CEIER_CPEIE (1 << 0) /* one-frame capture end interrupt */
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#define CEU_CAPCR_CTNCP (1 << 16) /* continuous capture mode (if set) */
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static void sh_mobile_ceu_capture(struct sh_mobile_ceu_dev *pcdev)
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{
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struct soc_camera_device *icd = pcdev->icd;
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unsigned long phys_addr;
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dma_addr_t phys_addr;
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ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) & ~1);
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ceu_write(pcdev, CETCR, ~ceu_read(pcdev, CETCR) & 0x0317f313);
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ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) | 1);
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ceu_write(pcdev, CAPCR, ceu_read(pcdev, CAPCR) & ~0x10000);
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ceu_write(pcdev, CETCR, 0x0317f313 ^ 0x10);
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/* The hardware is _very_ picky about this sequence. Especially
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* the CEU_CETCR_MAGIC value. It seems like we need to acknowledge
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* several not-so-well documented interrupt sources in CETCR.
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*/
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ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) & ~CEU_CEIER_CPEIE);
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ceu_write(pcdev, CETCR, ~ceu_read(pcdev, CETCR) & CEU_CETCR_MAGIC);
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ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) | CEU_CEIER_CPEIE);
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ceu_write(pcdev, CAPCR, ceu_read(pcdev, CAPCR) & ~CEU_CAPCR_CTNCP);
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ceu_write(pcdev, CETCR, CEU_CETCR_MAGIC ^ CEU_CETCR_IGRW);
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if (!pcdev->active)
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return;
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@ -179,7 +186,7 @@ static void sh_mobile_ceu_capture(struct sh_mobile_ceu_dev *pcdev)
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case V4L2_PIX_FMT_NV21:
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case V4L2_PIX_FMT_NV16:
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case V4L2_PIX_FMT_NV61:
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phys_addr += (icd->width * icd->height);
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phys_addr += icd->width * icd->height;
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ceu_write(pcdev, CDACR, phys_addr);
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}
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@ -431,13 +438,13 @@ static int sh_mobile_ceu_set_bus_param(struct soc_camera_device *icd,
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}
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}
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if ((icd->current_fmt->fourcc == V4L2_PIX_FMT_NV21) ||
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(icd->current_fmt->fourcc == V4L2_PIX_FMT_NV61))
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if (icd->current_fmt->fourcc == V4L2_PIX_FMT_NV21 ||
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icd->current_fmt->fourcc == V4L2_PIX_FMT_NV61)
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value ^= 0x00000100; /* swap U, V to change from NV1x->NVx1 */
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value |= (common_flags & SOCAM_VSYNC_ACTIVE_LOW) ? (1 << 1) : 0;
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value |= (common_flags & SOCAM_HSYNC_ACTIVE_LOW) ? (1 << 0) : 0;
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value |= (buswidth == 16) ? (1 << 12) : 0;
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value |= common_flags & SOCAM_VSYNC_ACTIVE_LOW ? 1 << 1 : 0;
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value |= common_flags & SOCAM_HSYNC_ACTIVE_LOW ? 1 << 0 : 0;
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value |= buswidth == 16 ? 1 << 12 : 0;
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ceu_write(pcdev, CAMCR, value);
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ceu_write(pcdev, CAPCR, 0x00300000);
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@ -447,13 +454,13 @@ static int sh_mobile_ceu_set_bus_param(struct soc_camera_device *icd,
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if (yuv_mode) {
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width = icd->width * 2;
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width = (buswidth == 16) ? width / 2 : width;
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width = buswidth == 16 ? width / 2 : width;
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cfszr_width = cdwdr_width = icd->width;
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} else {
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width = icd->width * ((icd->current_fmt->depth + 7) >> 3);
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width = (buswidth == 16) ? width / 2 : width;
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cfszr_width = (buswidth == 8) ? width / 2 : width;
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cdwdr_width = (buswidth == 16) ? width * 2 : width;
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width = buswidth == 16 ? width / 2 : width;
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cfszr_width = buswidth == 8 ? width / 2 : width;
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cdwdr_width = buswidth == 16 ? width * 2 : width;
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}
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ceu_write(pcdev, CAMOR, 0);
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