diff options
Diffstat (limited to 'drivers/media/platform/ti-vpe/csc.c')
| -rw-r--r-- | drivers/media/platform/ti-vpe/csc.c | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/drivers/media/platform/ti-vpe/csc.c b/drivers/media/platform/ti-vpe/csc.c new file mode 100644 index 00000000000..acfea500710 --- /dev/null +++ b/drivers/media/platform/ti-vpe/csc.c @@ -0,0 +1,196 @@ +/* + * Color space converter library + * + * Copyright (c) 2013 Texas Instruments Inc. + * + * David Griego, <dagriego@biglakesoftware.com> + * Dale Farnsworth, <dale@farnsworth.org> + * Archit Taneja, <archit@ti.com> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published by + * the Free Software Foundation. + */ + +#include <linux/err.h> +#include <linux/io.h> +#include <linux/platform_device.h> +#include <linux/slab.h> +#include <linux/videodev2.h> + +#include "csc.h" + +/* + * 16 coefficients in the order: + * a0, b0, c0, a1, b1, c1, a2, b2, c2, d0, d1, d2 + * (we may need to pass non-default values from user space later on, we might + * need to make the coefficient struct more easy to populate) + */ +struct colorspace_coeffs { + u16 sd[12]; + u16 hd[12]; +}; + +/* VIDEO_RANGE: limited range, GRAPHICS_RANGE: full range */ +#define CSC_COEFFS_VIDEO_RANGE_Y2R 0 +#define CSC_COEFFS_GRAPHICS_RANGE_Y2R 1 +#define CSC_COEFFS_VIDEO_RANGE_R2Y 2 +#define CSC_COEFFS_GRAPHICS_RANGE_R2Y 3 + +/* default colorspace coefficients */ +static struct colorspace_coeffs colorspace_coeffs[4] = { + [CSC_COEFFS_VIDEO_RANGE_Y2R] = { + { + /* SDTV */ + 0x0400, 0x0000, 0x057D, 0x0400, 0x1EA7, 0x1D35, + 0x0400, 0x06EF, 0x1FFE, 0x0D40, 0x0210, 0x0C88, + }, + { + /* HDTV */ + 0x0400, 0x0000, 0x0629, 0x0400, 0x1F45, 0x1E2B, + 0x0400, 0x0742, 0x0000, 0x0CEC, 0x0148, 0x0C60, + }, + }, + [CSC_COEFFS_GRAPHICS_RANGE_Y2R] = { + { + /* SDTV */ + 0x04A8, 0x1FFE, 0x0662, 0x04A8, 0x1E6F, 0x1CBF, + 0x04A8, 0x0812, 0x1FFF, 0x0C84, 0x0220, 0x0BAC, + }, + { + /* HDTV */ + 0x04A8, 0x0000, 0x072C, 0x04A8, 0x1F26, 0x1DDE, + 0x04A8, 0x0873, 0x0000, 0x0C20, 0x0134, 0x0B7C, + }, + }, + [CSC_COEFFS_VIDEO_RANGE_R2Y] = { + { + /* SDTV */ + 0x0132, 0x0259, 0x0075, 0x1F50, 0x1EA5, 0x020B, + 0x020B, 0x1E4A, 0x1FAB, 0x0000, 0x0200, 0x0200, + }, + { + /* HDTV */ + 0x00DA, 0x02DC, 0x004A, 0x1F88, 0x1E6C, 0x020C, + 0x020C, 0x1E24, 0x1FD0, 0x0000, 0x0200, 0x0200, + }, + }, + [CSC_COEFFS_GRAPHICS_RANGE_R2Y] = { + { + /* SDTV */ + 0x0107, 0x0204, 0x0064, 0x1F68, 0x1ED6, 0x01C2, + 0x01C2, 0x1E87, 0x1FB7, 0x0040, 0x0200, 0x0200, + }, + { + /* HDTV */ + 0x04A8, 0x0000, 0x072C, 0x04A8, 0x1F26, 0x1DDE, + 0x04A8, 0x0873, 0x0000, 0x0C20, 0x0134, 0x0B7C, + }, + }, +}; + +void csc_dump_regs(struct csc_data *csc) +{ + struct device *dev = &csc->pdev->dev; + + u32 read_reg(struct csc_data *csc, int offset) + { + return ioread32(csc->base + offset); + } + +#define DUMPREG(r) dev_dbg(dev, "%-35s %08x\n", #r, read_reg(csc, CSC_##r)) + + DUMPREG(CSC00); + DUMPREG(CSC01); + DUMPREG(CSC02); + DUMPREG(CSC03); + DUMPREG(CSC04); + DUMPREG(CSC05); + +#undef DUMPREG +} + +void csc_set_coeff_bypass(struct csc_data *csc, u32 *csc_reg5) +{ + *csc_reg5 |= CSC_BYPASS; +} + +/* + * set the color space converter coefficient shadow register values + */ +void csc_set_coeff(struct csc_data *csc, u32 *csc_reg0, + enum v4l2_colorspace src_colorspace, + enum v4l2_colorspace dst_colorspace) +{ + u32 *csc_reg5 = csc_reg0 + 5; + u32 *shadow_csc = csc_reg0; + struct colorspace_coeffs *sd_hd_coeffs; + u16 *coeff, *end_coeff; + enum v4l2_colorspace yuv_colorspace; + int sel = 0; + + /* + * support only graphics data range(full range) for now, a control ioctl + * would be nice here + */ + /* Y2R */ + if (dst_colorspace == V4L2_COLORSPACE_SRGB && + (src_colorspace == V4L2_COLORSPACE_SMPTE170M || + src_colorspace == V4L2_COLORSPACE_REC709)) { + /* Y2R */ + sel = 1; + yuv_colorspace = src_colorspace; + } else if ((dst_colorspace == V4L2_COLORSPACE_SMPTE170M || + dst_colorspace == V4L2_COLORSPACE_REC709) && + src_colorspace == V4L2_COLORSPACE_SRGB) { + /* R2Y */ + sel = 3; + yuv_colorspace = dst_colorspace; + } else { + *csc_reg5 |= CSC_BYPASS; + return; + } + + sd_hd_coeffs = &colorspace_coeffs[sel]; + + /* select between SD or HD coefficients */ + if (yuv_colorspace == V4L2_COLORSPACE_SMPTE170M) + coeff = sd_hd_coeffs->sd; + else + coeff = sd_hd_coeffs->hd; + + end_coeff = coeff + 12; + + for (; coeff < end_coeff; coeff += 2) + *shadow_csc++ = (*(coeff + 1) << 16) | *coeff; +} + +struct csc_data *csc_create(struct platform_device *pdev) +{ + struct csc_data *csc; + + dev_dbg(&pdev->dev, "csc_create\n"); + + csc = devm_kzalloc(&pdev->dev, sizeof(*csc), GFP_KERNEL); + if (!csc) { + dev_err(&pdev->dev, "couldn't alloc csc_data\n"); + return ERR_PTR(-ENOMEM); + } + + csc->pdev = pdev; + + csc->res = platform_get_resource_byname(pdev, IORESOURCE_MEM, + "vpe_csc"); + if (csc->res == NULL) { + dev_err(&pdev->dev, "missing platform resources data\n"); + return ERR_PTR(-ENODEV); + } + + csc->base = devm_ioremap_resource(&pdev->dev, csc->res); + if (!csc->base) { + dev_err(&pdev->dev, "failed to ioremap\n"); + return ERR_PTR(-ENOMEM); + } + + return csc; +} |