401 lines
9.7 KiB
C
401 lines
9.7 KiB
C
/*
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* Driver for the SH-Mobile MIPI CSI-2 unit
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*
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* Copyright (C) 2010, Guennadi Liakhovetski <g.liakhovetski@gmx.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/delay.h>
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#include <linux/err.h>
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#include <linux/i2c.h>
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#include <linux/io.h>
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#include <linux/platform_device.h>
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#include <linux/pm_runtime.h>
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#include <linux/slab.h>
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#include <linux/videodev2.h>
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#include <linux/module.h>
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#include <media/sh_mobile_ceu.h>
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#include <media/sh_mobile_csi2.h>
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#include <media/soc_camera.h>
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#include <media/soc_mediabus.h>
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#include <media/v4l2-common.h>
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#include <media/v4l2-dev.h>
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#include <media/v4l2-device.h>
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#include <media/v4l2-mediabus.h>
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#include <media/v4l2-subdev.h>
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#define SH_CSI2_TREF 0x00
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#define SH_CSI2_SRST 0x04
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#define SH_CSI2_PHYCNT 0x08
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#define SH_CSI2_CHKSUM 0x0C
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#define SH_CSI2_VCDT 0x10
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struct sh_csi2 {
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struct v4l2_subdev subdev;
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unsigned int irq;
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unsigned long mipi_flags;
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void __iomem *base;
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struct platform_device *pdev;
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struct sh_csi2_client_config *client;
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};
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static void sh_csi2_hwinit(struct sh_csi2 *priv);
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static int sh_csi2_set_fmt(struct v4l2_subdev *sd,
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struct v4l2_subdev_pad_config *cfg,
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struct v4l2_subdev_format *format)
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{
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struct sh_csi2 *priv = container_of(sd, struct sh_csi2, subdev);
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struct sh_csi2_pdata *pdata = priv->pdev->dev.platform_data;
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struct v4l2_mbus_framefmt *mf = &format->format;
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u32 tmp = (priv->client->channel & 3) << 8;
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if (format->pad)
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return -EINVAL;
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if (mf->width > 8188)
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mf->width = 8188;
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else if (mf->width & 1)
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mf->width &= ~1;
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switch (pdata->type) {
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case SH_CSI2C:
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switch (mf->code) {
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case MEDIA_BUS_FMT_UYVY8_2X8: /* YUV422 */
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case MEDIA_BUS_FMT_YUYV8_1_5X8: /* YUV420 */
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case MEDIA_BUS_FMT_Y8_1X8: /* RAW8 */
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case MEDIA_BUS_FMT_SBGGR8_1X8:
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case MEDIA_BUS_FMT_SGRBG8_1X8:
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break;
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default:
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/* All MIPI CSI-2 devices must support one of primary formats */
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mf->code = MEDIA_BUS_FMT_YUYV8_2X8;
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}
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break;
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case SH_CSI2I:
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switch (mf->code) {
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case MEDIA_BUS_FMT_Y8_1X8: /* RAW8 */
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case MEDIA_BUS_FMT_SBGGR8_1X8:
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case MEDIA_BUS_FMT_SGRBG8_1X8:
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case MEDIA_BUS_FMT_SBGGR10_1X10: /* RAW10 */
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case MEDIA_BUS_FMT_SBGGR12_1X12: /* RAW12 */
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break;
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default:
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/* All MIPI CSI-2 devices must support one of primary formats */
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mf->code = MEDIA_BUS_FMT_SBGGR8_1X8;
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}
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break;
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}
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if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
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cfg->try_fmt = *mf;
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return 0;
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}
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if (mf->width > 8188 || mf->width & 1)
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return -EINVAL;
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switch (mf->code) {
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case MEDIA_BUS_FMT_UYVY8_2X8:
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tmp |= 0x1e; /* YUV422 8 bit */
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break;
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case MEDIA_BUS_FMT_YUYV8_1_5X8:
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tmp |= 0x18; /* YUV420 8 bit */
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break;
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case MEDIA_BUS_FMT_RGB555_2X8_PADHI_BE:
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tmp |= 0x21; /* RGB555 */
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break;
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case MEDIA_BUS_FMT_RGB565_2X8_BE:
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tmp |= 0x22; /* RGB565 */
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break;
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case MEDIA_BUS_FMT_Y8_1X8:
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case MEDIA_BUS_FMT_SBGGR8_1X8:
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case MEDIA_BUS_FMT_SGRBG8_1X8:
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tmp |= 0x2a; /* RAW8 */
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break;
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default:
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return -EINVAL;
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}
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iowrite32(tmp, priv->base + SH_CSI2_VCDT);
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return 0;
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}
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static int sh_csi2_g_mbus_config(struct v4l2_subdev *sd,
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struct v4l2_mbus_config *cfg)
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{
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struct sh_csi2 *priv = container_of(sd, struct sh_csi2, subdev);
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if (!priv->mipi_flags) {
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struct soc_camera_device *icd = v4l2_get_subdev_hostdata(sd);
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struct v4l2_subdev *client_sd = soc_camera_to_subdev(icd);
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struct sh_csi2_pdata *pdata = priv->pdev->dev.platform_data;
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unsigned long common_flags, csi2_flags;
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struct v4l2_mbus_config client_cfg = {.type = V4L2_MBUS_CSI2,};
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int ret;
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/* Check if we can support this camera */
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csi2_flags = V4L2_MBUS_CSI2_CONTINUOUS_CLOCK |
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V4L2_MBUS_CSI2_1_LANE;
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switch (pdata->type) {
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case SH_CSI2C:
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if (priv->client->lanes != 1)
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csi2_flags |= V4L2_MBUS_CSI2_2_LANE;
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break;
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case SH_CSI2I:
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switch (priv->client->lanes) {
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default:
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csi2_flags |= V4L2_MBUS_CSI2_4_LANE;
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case 3:
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csi2_flags |= V4L2_MBUS_CSI2_3_LANE;
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case 2:
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csi2_flags |= V4L2_MBUS_CSI2_2_LANE;
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}
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}
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ret = v4l2_subdev_call(client_sd, video, g_mbus_config, &client_cfg);
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if (ret == -ENOIOCTLCMD)
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common_flags = csi2_flags;
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else if (!ret)
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common_flags = soc_mbus_config_compatible(&client_cfg,
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csi2_flags);
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else
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common_flags = 0;
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if (!common_flags)
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return -EINVAL;
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/* All good: camera MIPI configuration supported */
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priv->mipi_flags = common_flags;
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}
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if (cfg) {
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cfg->flags = V4L2_MBUS_PCLK_SAMPLE_RISING |
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V4L2_MBUS_HSYNC_ACTIVE_HIGH | V4L2_MBUS_VSYNC_ACTIVE_HIGH |
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V4L2_MBUS_MASTER | V4L2_MBUS_DATA_ACTIVE_HIGH;
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cfg->type = V4L2_MBUS_PARALLEL;
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}
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return 0;
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}
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static int sh_csi2_s_mbus_config(struct v4l2_subdev *sd,
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const struct v4l2_mbus_config *cfg)
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{
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struct sh_csi2 *priv = container_of(sd, struct sh_csi2, subdev);
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struct soc_camera_device *icd = v4l2_get_subdev_hostdata(sd);
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struct v4l2_subdev *client_sd = soc_camera_to_subdev(icd);
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struct v4l2_mbus_config client_cfg = {.type = V4L2_MBUS_CSI2,};
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int ret = sh_csi2_g_mbus_config(sd, NULL);
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if (ret < 0)
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return ret;
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pm_runtime_get_sync(&priv->pdev->dev);
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sh_csi2_hwinit(priv);
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client_cfg.flags = priv->mipi_flags;
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return v4l2_subdev_call(client_sd, video, s_mbus_config, &client_cfg);
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}
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static struct v4l2_subdev_video_ops sh_csi2_subdev_video_ops = {
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.g_mbus_config = sh_csi2_g_mbus_config,
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.s_mbus_config = sh_csi2_s_mbus_config,
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};
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static struct v4l2_subdev_pad_ops sh_csi2_subdev_pad_ops = {
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.set_fmt = sh_csi2_set_fmt,
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};
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static void sh_csi2_hwinit(struct sh_csi2 *priv)
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{
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struct sh_csi2_pdata *pdata = priv->pdev->dev.platform_data;
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__u32 tmp = 0x10; /* Enable MIPI CSI clock lane */
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/* Reflect registers immediately */
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iowrite32(0x00000001, priv->base + SH_CSI2_TREF);
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/* reset CSI2 harware */
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iowrite32(0x00000001, priv->base + SH_CSI2_SRST);
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udelay(5);
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iowrite32(0x00000000, priv->base + SH_CSI2_SRST);
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switch (pdata->type) {
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case SH_CSI2C:
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if (priv->client->lanes == 1)
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tmp |= 1;
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else
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/* Default - both lanes */
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tmp |= 3;
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break;
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case SH_CSI2I:
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if (!priv->client->lanes || priv->client->lanes > 4)
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/* Default - all 4 lanes */
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tmp |= 0xf;
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else
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tmp |= (1 << priv->client->lanes) - 1;
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}
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if (priv->client->phy == SH_CSI2_PHY_MAIN)
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tmp |= 0x8000;
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iowrite32(tmp, priv->base + SH_CSI2_PHYCNT);
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tmp = 0;
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if (pdata->flags & SH_CSI2_ECC)
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tmp |= 2;
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if (pdata->flags & SH_CSI2_CRC)
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tmp |= 1;
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iowrite32(tmp, priv->base + SH_CSI2_CHKSUM);
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}
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static int sh_csi2_client_connect(struct sh_csi2 *priv)
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{
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struct device *dev = v4l2_get_subdevdata(&priv->subdev);
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struct sh_csi2_pdata *pdata = dev->platform_data;
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struct soc_camera_device *icd = v4l2_get_subdev_hostdata(&priv->subdev);
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int i;
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if (priv->client)
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return -EBUSY;
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for (i = 0; i < pdata->num_clients; i++)
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if ((pdata->clients[i].pdev &&
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&pdata->clients[i].pdev->dev == icd->pdev) ||
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(icd->control &&
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strcmp(pdata->clients[i].name, dev_name(icd->control))))
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break;
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dev_dbg(dev, "%s(%p): found #%d\n", __func__, dev, i);
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if (i == pdata->num_clients)
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return -ENODEV;
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priv->client = pdata->clients + i;
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return 0;
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}
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static void sh_csi2_client_disconnect(struct sh_csi2 *priv)
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{
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if (!priv->client)
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return;
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priv->client = NULL;
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pm_runtime_put(v4l2_get_subdevdata(&priv->subdev));
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}
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static int sh_csi2_s_power(struct v4l2_subdev *sd, int on)
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{
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struct sh_csi2 *priv = container_of(sd, struct sh_csi2, subdev);
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if (on)
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return sh_csi2_client_connect(priv);
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sh_csi2_client_disconnect(priv);
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return 0;
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}
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static struct v4l2_subdev_core_ops sh_csi2_subdev_core_ops = {
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.s_power = sh_csi2_s_power,
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};
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static struct v4l2_subdev_ops sh_csi2_subdev_ops = {
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.core = &sh_csi2_subdev_core_ops,
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.video = &sh_csi2_subdev_video_ops,
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.pad = &sh_csi2_subdev_pad_ops,
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};
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static int sh_csi2_probe(struct platform_device *pdev)
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{
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struct resource *res;
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unsigned int irq;
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int ret;
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struct sh_csi2 *priv;
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/* Platform data specify the PHY, lanes, ECC, CRC */
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struct sh_csi2_pdata *pdata = pdev->dev.platform_data;
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if (!pdata)
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return -EINVAL;
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priv = devm_kzalloc(&pdev->dev, sizeof(struct sh_csi2), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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/* Interrupt unused so far */
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irq = platform_get_irq(pdev, 0);
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if (!res || (int)irq <= 0) {
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dev_err(&pdev->dev, "Not enough CSI2 platform resources.\n");
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return -ENODEV;
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}
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/* TODO: Add support for CSI2I. Careful: different register layout! */
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if (pdata->type != SH_CSI2C) {
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dev_err(&pdev->dev, "Only CSI2C supported ATM.\n");
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return -EINVAL;
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}
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priv->irq = irq;
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priv->base = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(priv->base))
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return PTR_ERR(priv->base);
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priv->pdev = pdev;
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priv->subdev.owner = THIS_MODULE;
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priv->subdev.dev = &pdev->dev;
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platform_set_drvdata(pdev, &priv->subdev);
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v4l2_subdev_init(&priv->subdev, &sh_csi2_subdev_ops);
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v4l2_set_subdevdata(&priv->subdev, &pdev->dev);
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snprintf(priv->subdev.name, V4L2_SUBDEV_NAME_SIZE, "%s.mipi-csi",
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dev_name(&pdev->dev));
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ret = v4l2_async_register_subdev(&priv->subdev);
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if (ret < 0)
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return ret;
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pm_runtime_enable(&pdev->dev);
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dev_dbg(&pdev->dev, "CSI2 probed.\n");
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return 0;
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}
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static int sh_csi2_remove(struct platform_device *pdev)
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{
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struct v4l2_subdev *subdev = platform_get_drvdata(pdev);
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struct sh_csi2 *priv = container_of(subdev, struct sh_csi2, subdev);
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v4l2_async_unregister_subdev(&priv->subdev);
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pm_runtime_disable(&pdev->dev);
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return 0;
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}
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static struct platform_driver __refdata sh_csi2_pdrv = {
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.remove = sh_csi2_remove,
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.probe = sh_csi2_probe,
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.driver = {
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.name = "sh-mobile-csi2",
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},
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};
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module_platform_driver(sh_csi2_pdrv);
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MODULE_DESCRIPTION("SH-Mobile MIPI CSI-2 driver");
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MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("platform:sh-mobile-csi2");
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