drivers/media/platform/xilinx/xilinx-vip.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Xilinx Video IP Core
   4  *
   5  * Copyright (C) 2013-2015 Ideas on Board
   6  * Copyright (C) 2013-2015 Xilinx, Inc.
   7  *
   8  * Contacts: Hyun Kwon <hyun.kwon@xilinx.com>
   9  *           Laurent Pinchart <laurent.pinchart@ideasonboard.com>
  10  */
  11
  12 #include <linux/clk.h>
  13 #include <linux/export.h>
  14 #include <linux/kernel.h>
  15 #include <linux/of.h>
  16 #include <linux/platform_device.h>
  17
  18 #include <dt-bindings/media/xilinx-vip.h>
  19
  20 #include "xilinx-vip.h"
  21
  22 /* -----------------------------------------------------------------------------
  23  * Helper functions
  24  */
  25
  26 static const struct xvip_video_format xvip_video_formats[] = {
  27         { XVIP_VF_YUV_422, 8, NULL, MEDIA_BUS_FMT_UYVY8_1X16,
  28           2, V4L2_PIX_FMT_YUYV },
  29         { XVIP_VF_YUV_444, 8, NULL, MEDIA_BUS_FMT_VUY8_1X24,
  30           3, V4L2_PIX_FMT_YUV444 },
  31         { XVIP_VF_RBG, 8, NULL, MEDIA_BUS_FMT_RBG888_1X24,
  32           3, 0 },
  33         { XVIP_VF_MONO_SENSOR, 8, "mono", MEDIA_BUS_FMT_Y8_1X8,
  34           1, V4L2_PIX_FMT_GREY },
  35         { XVIP_VF_MONO_SENSOR, 8, "rggb", MEDIA_BUS_FMT_SRGGB8_1X8,
  36           1, V4L2_PIX_FMT_SRGGB8 },
  37         { XVIP_VF_MONO_SENSOR, 8, "grbg", MEDIA_BUS_FMT_SGRBG8_1X8,
  38           1, V4L2_PIX_FMT_SGRBG8 },
  39         { XVIP_VF_MONO_SENSOR, 8, "gbrg", MEDIA_BUS_FMT_SGBRG8_1X8,
  40           1, V4L2_PIX_FMT_SGBRG8 },
  41         { XVIP_VF_MONO_SENSOR, 8, "bggr", MEDIA_BUS_FMT_SBGGR8_1X8,
  42           1, V4L2_PIX_FMT_SBGGR8 },
  43 };
  44
  45 /**
  46  * xvip_get_format_by_code - Retrieve format information for a media bus code
  47  * @code: the format media bus code
  48  *
  49  * Return: a pointer to the format information structure corresponding to the
  50  * given V4L2 media bus format @code, or ERR_PTR if no corresponding format can
  51  * be found.
  52  */
  53 const struct xvip_video_format *xvip_get_format_by_code(unsigned int code)
  54 {
  55         unsigned int i;
  56
  57         for (i = 0; i < ARRAY_SIZE(xvip_video_formats); ++i) {
  58                 const struct xvip_video_format *format = &xvip_video_formats[i];
  59
  60                 if (format->code == code)
  61                         return format;
  62         }
  63
  64         return ERR_PTR(-EINVAL);
  65 }
  66 EXPORT_SYMBOL_GPL(xvip_get_format_by_code);
  67
  68 /**
  69  * xvip_get_format_by_fourcc - Retrieve format information for a 4CC
  70  * @fourcc: the format 4CC
  71  *
  72  * Return: a pointer to the format information structure corresponding to the
  73  * given V4L2 format @fourcc, or ERR_PTR if no corresponding format can be
  74  * found.
  75  */
  76 const struct xvip_video_format *xvip_get_format_by_fourcc(u32 fourcc)
  77 {
  78         unsigned int i;
  79
  80         for (i = 0; i < ARRAY_SIZE(xvip_video_formats); ++i) {
  81                 const struct xvip_video_format *format = &xvip_video_formats[i];
  82
  83                 if (format->fourcc == fourcc)
  84                         return format;
  85         }
  86
  87         return ERR_PTR(-EINVAL);
  88 }
  89 EXPORT_SYMBOL_GPL(xvip_get_format_by_fourcc);
  90
  91 /**
  92  * xvip_of_get_format - Parse a device tree node and return format information
  93  * @node: the device tree node
  94  *
  95  * Read the xlnx,video-format, xlnx,video-width and xlnx,cfa-pattern properties
  96  * from the device tree @node passed as an argument and return the corresponding
  97  * format information.
  98  *
  99  * Return: a pointer to the format information structure corresponding to the
 100  * format name and width, or ERR_PTR if no corresponding format can be found.
 101  */
 102 const struct xvip_video_format *xvip_of_get_format(struct device_node *node)
 103 {
 104         const char *pattern = "mono";
 105         unsigned int vf_code;
 106         unsigned int i;
 107         u32 width;
 108         int ret;
 109
 110         ret = of_property_read_u32(node, "xlnx,video-format", &vf_code);
 111         if (ret < 0)
 112                 return ERR_PTR(ret);
 113
 114         ret = of_property_read_u32(node, "xlnx,video-width", &width);
 115         if (ret < 0)
 116                 return ERR_PTR(ret);
 117
 118         if (vf_code == XVIP_VF_MONO_SENSOR)
 119                 of_property_read_string(node, "xlnx,cfa-pattern", &pattern);
 120
 121         for (i = 0; i < ARRAY_SIZE(xvip_video_formats); ++i) {
 122                 const struct xvip_video_format *format = &xvip_video_formats[i];
 123
 124                 if (format->vf_code != vf_code || format->width != width)
 125                         continue;
 126
 127                 if (vf_code == XVIP_VF_MONO_SENSOR &&
 128                     strcmp(pattern, format->pattern))
 129                         continue;
 130
 131                 return format;
 132         }
 133
 134         return ERR_PTR(-EINVAL);
 135 }
 136 EXPORT_SYMBOL_GPL(xvip_of_get_format);
 137
 138 /**
 139  * xvip_set_format_size - Set the media bus frame format size
 140  * @format: V4L2 frame format on media bus
 141  * @fmt: media bus format
 142  *
 143  * Set the media bus frame format size. The width / height from the subdevice
 144  * format are set to the given media bus format. The new format size is stored
 145  * in @format. The width and height are clamped using default min / max values.
 146  */
 147 void xvip_set_format_size(struct v4l2_mbus_framefmt *format,
 148                           const struct v4l2_subdev_format *fmt)
 149 {
 150         format->width = clamp_t(unsigned int, fmt->format.width,
 151                                 XVIP_MIN_WIDTH, XVIP_MAX_WIDTH);
 152         format->height = clamp_t(unsigned int, fmt->format.height,
 153                          XVIP_MIN_HEIGHT, XVIP_MAX_HEIGHT);
 154 }
 155 EXPORT_SYMBOL_GPL(xvip_set_format_size);
 156
 157 /**
 158  * xvip_clr_or_set - Clear or set the register with a bitmask
 159  * @xvip: Xilinx Video IP device
 160  * @addr: address of register
 161  * @mask: bitmask to be set or cleared
 162  * @set: boolean flag indicating whether to set or clear
 163  *
 164  * Clear or set the register at address @addr with a bitmask @mask depending on
 165  * the boolean flag @set. When the flag @set is true, the bitmask is set in
 166  * the register, otherwise the bitmask is cleared from the register
 167  * when the flag @set is false.
 168  *
 169  * Fox example, this function can be used to set a control with a boolean value
 170  * requested by users. If the caller knows whether to set or clear in the first
 171  * place, the caller should call xvip_clr() or xvip_set() directly instead of
 172  * using this function.
 173  */
 174 void xvip_clr_or_set(struct xvip_device *xvip, u32 addr, u32 mask, bool set)
 175 {
 176         u32 reg;
 177
 178         reg = xvip_read(xvip, addr);
 179         reg = set ? reg | mask : reg & ~mask;
 180         xvip_write(xvip, addr, reg);
 181 }
 182 EXPORT_SYMBOL_GPL(xvip_clr_or_set);
 183
 184 /**
 185  * xvip_clr_and_set - Clear and set the register with a bitmask
 186  * @xvip: Xilinx Video IP device
 187  * @addr: address of register
 188  * @clr: bitmask to be cleared
 189  * @set: bitmask to be set
 190  *
 191  * Clear a bit(s) of mask @clr in the register at address @addr, then set
 192  * a bit(s) of mask @set in the register after.
 193  */
 194 void xvip_clr_and_set(struct xvip_device *xvip, u32 addr, u32 clr, u32 set)
 195 {
 196         u32 reg;
 197
 198         reg = xvip_read(xvip, addr);
 199         reg &= ~clr;
 200         reg |= set;
 201         xvip_write(xvip, addr, reg);
 202 }
 203 EXPORT_SYMBOL_GPL(xvip_clr_and_set);
 204
 205 int xvip_init_resources(struct xvip_device *xvip)
 206 {
 207         struct platform_device *pdev = to_platform_device(xvip->dev);
 208         struct resource *res;
 209
 210         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 211         xvip->iomem = devm_ioremap_resource(xvip->dev, res);
 212         if (IS_ERR(xvip->iomem))
 213                 return PTR_ERR(xvip->iomem);
 214
 215         xvip->clk = devm_clk_get(xvip->dev, NULL);
 216         if (IS_ERR(xvip->clk))
 217                 return PTR_ERR(xvip->clk);
 218
 219         clk_prepare_enable(xvip->clk);
 220         return 0;
 221 }
 222 EXPORT_SYMBOL_GPL(xvip_init_resources);
 223
 224 void xvip_cleanup_resources(struct xvip_device *xvip)
 225 {
 226         clk_disable_unprepare(xvip->clk);
 227 }
 228 EXPORT_SYMBOL_GPL(xvip_cleanup_resources);
 229
 230 /* -----------------------------------------------------------------------------
 231  * Subdev operations handlers
 232  */
 233
 234 /**
 235  * xvip_enum_mbus_code - Enumerate the media format code
 236  * @subdev: V4L2 subdevice
 237  * @cfg: V4L2 subdev pad configuration
 238  * @code: returning media bus code
 239  *
 240  * Enumerate the media bus code of the subdevice. Return the corresponding
 241  * pad format code. This function only works for subdevices with fixed format
 242  * on all pads. Subdevices with multiple format should have their own
 243  * function to enumerate mbus codes.
 244  *
 245  * Return: 0 if the media bus code is found, or -EINVAL if the format index
 246  * is not valid.
 247  */
 248 int xvip_enum_mbus_code(struct v4l2_subdev *subdev,
 249                         struct v4l2_subdev_pad_config *cfg,
 250                         struct v4l2_subdev_mbus_code_enum *code)
 251 {
 252         struct v4l2_mbus_framefmt *format;
 253
 254         /* Enumerating frame sizes based on the active configuration isn't
 255          * supported yet.
 256          */
 257         if (code->which == V4L2_SUBDEV_FORMAT_ACTIVE)
 258                 return -EINVAL;
 259
 260         if (code->index)
 261                 return -EINVAL;
 262
 263         format = v4l2_subdev_get_try_format(subdev, cfg, code->pad);
 264
 265         code->code = format->code;
 266
 267         return 0;
 268 }
 269 EXPORT_SYMBOL_GPL(xvip_enum_mbus_code);
 270
 271 /**
 272  * xvip_enum_frame_size - Enumerate the media bus frame size
 273  * @subdev: V4L2 subdevice
 274  * @cfg: V4L2 subdev pad configuration
 275  * @fse: returning media bus frame size
 276  *
 277  * This function is a drop-in implementation of the subdev enum_frame_size pad
 278  * operation. It assumes that the subdevice has one sink pad and one source
 279  * pad, and that the format on the source pad is always identical to the
 280  * format on the sink pad. Entities with different requirements need to
 281  * implement their own enum_frame_size handlers.
 282  *
 283  * Return: 0 if the media bus frame size is found, or -EINVAL
 284  * if the index or the code is not valid.
 285  */
 286 int xvip_enum_frame_size(struct v4l2_subdev *subdev,
 287                          struct v4l2_subdev_pad_config *cfg,
 288                          struct v4l2_subdev_frame_size_enum *fse)
 289 {
 290         struct v4l2_mbus_framefmt *format;
 291
 292         /* Enumerating frame sizes based on the active configuration isn't
 293          * supported yet.
 294          */
 295         if (fse->which == V4L2_SUBDEV_FORMAT_ACTIVE)
 296                 return -EINVAL;
 297
 298         format = v4l2_subdev_get_try_format(subdev, cfg, fse->pad);
 299
 300         if (fse->index || fse->code != format->code)
 301                 return -EINVAL;
 302
 303         if (fse->pad == XVIP_PAD_SINK) {
 304                 fse->min_width = XVIP_MIN_WIDTH;
 305                 fse->max_width = XVIP_MAX_WIDTH;
 306                 fse->min_height = XVIP_MIN_HEIGHT;
 307                 fse->max_height = XVIP_MAX_HEIGHT;
 308         } else {
 309                 /* The size on the source pad is fixed and always identical to
 310                  * the size on the sink pad.
 311                  */
 312                 fse->min_width = format->width;
 313                 fse->max_width = format->width;
 314                 fse->min_height = format->height;
 315                 fse->max_height = format->height;
 316         }
 317
 318         return 0;
 319 }
 320 EXPORT_SYMBOL_GPL(xvip_enum_frame_size);