| /* |
| * Driver for the SH-Mobile MIPI CSI-2 unit |
| * |
| * Copyright (C) 2010, Guennadi Liakhovetski <g.liakhovetski@gmx.de> |
| * |
| * 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/delay.h> |
| #include <linux/err.h> |
| #include <linux/i2c.h> |
| #include <linux/io.h> |
| #include <linux/platform_device.h> |
| #include <linux/pm_runtime.h> |
| #include <linux/slab.h> |
| #include <linux/videodev2.h> |
| #include <linux/module.h> |
| |
| #include <media/sh_mobile_ceu.h> |
| #include <media/sh_mobile_csi2.h> |
| #include <media/soc_camera.h> |
| #include <media/soc_mediabus.h> |
| #include <media/v4l2-common.h> |
| #include <media/v4l2-dev.h> |
| #include <media/v4l2-device.h> |
| #include <media/v4l2-mediabus.h> |
| #include <media/v4l2-subdev.h> |
| |
| #define SH_CSI2_TREF 0x00 |
| #define SH_CSI2_SRST 0x04 |
| #define SH_CSI2_PHYCNT 0x08 |
| #define SH_CSI2_CHKSUM 0x0C |
| #define SH_CSI2_VCDT 0x10 |
| |
| struct sh_csi2 { |
| struct v4l2_subdev subdev; |
| unsigned int irq; |
| unsigned long mipi_flags; |
| void __iomem *base; |
| struct platform_device *pdev; |
| struct sh_csi2_client_config *client; |
| }; |
| |
| static void sh_csi2_hwinit(struct sh_csi2 *priv); |
| |
| static int sh_csi2_try_fmt(struct v4l2_subdev *sd, |
| struct v4l2_mbus_framefmt *mf) |
| { |
| struct sh_csi2 *priv = container_of(sd, struct sh_csi2, subdev); |
| struct sh_csi2_pdata *pdata = priv->pdev->dev.platform_data; |
| |
| if (mf->width > 8188) |
| mf->width = 8188; |
| else if (mf->width & 1) |
| mf->width &= ~1; |
| |
| switch (pdata->type) { |
| case SH_CSI2C: |
| switch (mf->code) { |
| case MEDIA_BUS_FMT_UYVY8_2X8: /* YUV422 */ |
| case MEDIA_BUS_FMT_YUYV8_1_5X8: /* YUV420 */ |
| case MEDIA_BUS_FMT_Y8_1X8: /* RAW8 */ |
| case MEDIA_BUS_FMT_SBGGR8_1X8: |
| case MEDIA_BUS_FMT_SGRBG8_1X8: |
| break; |
| default: |
| /* All MIPI CSI-2 devices must support one of primary formats */ |
| mf->code = MEDIA_BUS_FMT_YUYV8_2X8; |
| } |
| break; |
| case SH_CSI2I: |
| switch (mf->code) { |
| case MEDIA_BUS_FMT_Y8_1X8: /* RAW8 */ |
| case MEDIA_BUS_FMT_SBGGR8_1X8: |
| case MEDIA_BUS_FMT_SGRBG8_1X8: |
| case MEDIA_BUS_FMT_SBGGR10_1X10: /* RAW10 */ |
| case MEDIA_BUS_FMT_SBGGR12_1X12: /* RAW12 */ |
| break; |
| default: |
| /* All MIPI CSI-2 devices must support one of primary formats */ |
| mf->code = MEDIA_BUS_FMT_SBGGR8_1X8; |
| } |
| break; |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * We have done our best in try_fmt to try and tell the sensor, which formats |
| * we support. If now the configuration is unsuitable for us we can only |
| * error out. |
| */ |
| static int sh_csi2_s_fmt(struct v4l2_subdev *sd, |
| struct v4l2_mbus_framefmt *mf) |
| { |
| struct sh_csi2 *priv = container_of(sd, struct sh_csi2, subdev); |
| u32 tmp = (priv->client->channel & 3) << 8; |
| |
| dev_dbg(sd->v4l2_dev->dev, "%s(%u)\n", __func__, mf->code); |
| if (mf->width > 8188 || mf->width & 1) |
| return -EINVAL; |
| |
| switch (mf->code) { |
| case MEDIA_BUS_FMT_UYVY8_2X8: |
| tmp |= 0x1e; /* YUV422 8 bit */ |
| break; |
| case MEDIA_BUS_FMT_YUYV8_1_5X8: |
| tmp |= 0x18; /* YUV420 8 bit */ |
| break; |
| case MEDIA_BUS_FMT_RGB555_2X8_PADHI_BE: |
| tmp |= 0x21; /* RGB555 */ |
| break; |
| case MEDIA_BUS_FMT_RGB565_2X8_BE: |
| tmp |= 0x22; /* RGB565 */ |
| break; |
| case MEDIA_BUS_FMT_Y8_1X8: |
| case MEDIA_BUS_FMT_SBGGR8_1X8: |
| case MEDIA_BUS_FMT_SGRBG8_1X8: |
| tmp |= 0x2a; /* RAW8 */ |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| iowrite32(tmp, priv->base + SH_CSI2_VCDT); |
| |
| return 0; |
| } |
| |
| static int sh_csi2_g_mbus_config(struct v4l2_subdev *sd, |
| struct v4l2_mbus_config *cfg) |
| { |
| struct sh_csi2 *priv = container_of(sd, struct sh_csi2, subdev); |
| |
| if (!priv->mipi_flags) { |
| struct soc_camera_device *icd = v4l2_get_subdev_hostdata(sd); |
| struct v4l2_subdev *client_sd = soc_camera_to_subdev(icd); |
| struct sh_csi2_pdata *pdata = priv->pdev->dev.platform_data; |
| unsigned long common_flags, csi2_flags; |
| struct v4l2_mbus_config client_cfg = {.type = V4L2_MBUS_CSI2,}; |
| int ret; |
| |
| /* Check if we can support this camera */ |
| csi2_flags = V4L2_MBUS_CSI2_CONTINUOUS_CLOCK | |
| V4L2_MBUS_CSI2_1_LANE; |
| |
| switch (pdata->type) { |
| case SH_CSI2C: |
| if (priv->client->lanes != 1) |
| csi2_flags |= V4L2_MBUS_CSI2_2_LANE; |
| break; |
| case SH_CSI2I: |
| switch (priv->client->lanes) { |
| default: |
| csi2_flags |= V4L2_MBUS_CSI2_4_LANE; |
| case 3: |
| csi2_flags |= V4L2_MBUS_CSI2_3_LANE; |
| case 2: |
| csi2_flags |= V4L2_MBUS_CSI2_2_LANE; |
| } |
| } |
| |
| ret = v4l2_subdev_call(client_sd, video, g_mbus_config, &client_cfg); |
| if (ret == -ENOIOCTLCMD) |
| common_flags = csi2_flags; |
| else if (!ret) |
| common_flags = soc_mbus_config_compatible(&client_cfg, |
| csi2_flags); |
| else |
| common_flags = 0; |
| |
| if (!common_flags) |
| return -EINVAL; |
| |
| /* All good: camera MIPI configuration supported */ |
| priv->mipi_flags = common_flags; |
| } |
| |
| if (cfg) { |
| cfg->flags = V4L2_MBUS_PCLK_SAMPLE_RISING | |
| V4L2_MBUS_HSYNC_ACTIVE_HIGH | V4L2_MBUS_VSYNC_ACTIVE_HIGH | |
| V4L2_MBUS_MASTER | V4L2_MBUS_DATA_ACTIVE_HIGH; |
| cfg->type = V4L2_MBUS_PARALLEL; |
| } |
| |
| return 0; |
| } |
| |
| static int sh_csi2_s_mbus_config(struct v4l2_subdev *sd, |
| const struct v4l2_mbus_config *cfg) |
| { |
| struct sh_csi2 *priv = container_of(sd, struct sh_csi2, subdev); |
| struct soc_camera_device *icd = v4l2_get_subdev_hostdata(sd); |
| struct v4l2_subdev *client_sd = soc_camera_to_subdev(icd); |
| struct v4l2_mbus_config client_cfg = {.type = V4L2_MBUS_CSI2,}; |
| int ret = sh_csi2_g_mbus_config(sd, NULL); |
| |
| if (ret < 0) |
| return ret; |
| |
| pm_runtime_get_sync(&priv->pdev->dev); |
| |
| sh_csi2_hwinit(priv); |
| |
| client_cfg.flags = priv->mipi_flags; |
| |
| return v4l2_subdev_call(client_sd, video, s_mbus_config, &client_cfg); |
| } |
| |
| static struct v4l2_subdev_video_ops sh_csi2_subdev_video_ops = { |
| .s_mbus_fmt = sh_csi2_s_fmt, |
| .try_mbus_fmt = sh_csi2_try_fmt, |
| .g_mbus_config = sh_csi2_g_mbus_config, |
| .s_mbus_config = sh_csi2_s_mbus_config, |
| }; |
| |
| static void sh_csi2_hwinit(struct sh_csi2 *priv) |
| { |
| struct sh_csi2_pdata *pdata = priv->pdev->dev.platform_data; |
| __u32 tmp = 0x10; /* Enable MIPI CSI clock lane */ |
| |
| /* Reflect registers immediately */ |
| iowrite32(0x00000001, priv->base + SH_CSI2_TREF); |
| /* reset CSI2 harware */ |
| iowrite32(0x00000001, priv->base + SH_CSI2_SRST); |
| udelay(5); |
| iowrite32(0x00000000, priv->base + SH_CSI2_SRST); |
| |
| switch (pdata->type) { |
| case SH_CSI2C: |
| if (priv->client->lanes == 1) |
| tmp |= 1; |
| else |
| /* Default - both lanes */ |
| tmp |= 3; |
| break; |
| case SH_CSI2I: |
| if (!priv->client->lanes || priv->client->lanes > 4) |
| /* Default - all 4 lanes */ |
| tmp |= 0xf; |
| else |
| tmp |= (1 << priv->client->lanes) - 1; |
| } |
| |
| if (priv->client->phy == SH_CSI2_PHY_MAIN) |
| tmp |= 0x8000; |
| |
| iowrite32(tmp, priv->base + SH_CSI2_PHYCNT); |
| |
| tmp = 0; |
| if (pdata->flags & SH_CSI2_ECC) |
| tmp |= 2; |
| if (pdata->flags & SH_CSI2_CRC) |
| tmp |= 1; |
| iowrite32(tmp, priv->base + SH_CSI2_CHKSUM); |
| } |
| |
| static int sh_csi2_client_connect(struct sh_csi2 *priv) |
| { |
| struct device *dev = v4l2_get_subdevdata(&priv->subdev); |
| struct sh_csi2_pdata *pdata = dev->platform_data; |
| struct soc_camera_device *icd = v4l2_get_subdev_hostdata(&priv->subdev); |
| int i; |
| |
| if (priv->client) |
| return -EBUSY; |
| |
| for (i = 0; i < pdata->num_clients; i++) |
| if ((pdata->clients[i].pdev && |
| &pdata->clients[i].pdev->dev == icd->pdev) || |
| (icd->control && |
| strcmp(pdata->clients[i].name, dev_name(icd->control)))) |
| break; |
| |
| dev_dbg(dev, "%s(%p): found #%d\n", __func__, dev, i); |
| |
| if (i == pdata->num_clients) |
| return -ENODEV; |
| |
| priv->client = pdata->clients + i; |
| |
| return 0; |
| } |
| |
| static void sh_csi2_client_disconnect(struct sh_csi2 *priv) |
| { |
| if (!priv->client) |
| return; |
| |
| priv->client = NULL; |
| |
| pm_runtime_put(v4l2_get_subdevdata(&priv->subdev)); |
| } |
| |
| static int sh_csi2_s_power(struct v4l2_subdev *sd, int on) |
| { |
| struct sh_csi2 *priv = container_of(sd, struct sh_csi2, subdev); |
| |
| if (on) |
| return sh_csi2_client_connect(priv); |
| |
| sh_csi2_client_disconnect(priv); |
| return 0; |
| } |
| |
| static struct v4l2_subdev_core_ops sh_csi2_subdev_core_ops = { |
| .s_power = sh_csi2_s_power, |
| }; |
| |
| static struct v4l2_subdev_ops sh_csi2_subdev_ops = { |
| .core = &sh_csi2_subdev_core_ops, |
| .video = &sh_csi2_subdev_video_ops, |
| }; |
| |
| static int sh_csi2_probe(struct platform_device *pdev) |
| { |
| struct resource *res; |
| unsigned int irq; |
| int ret; |
| struct sh_csi2 *priv; |
| /* Platform data specify the PHY, lanes, ECC, CRC */ |
| struct sh_csi2_pdata *pdata = pdev->dev.platform_data; |
| |
| if (!pdata) |
| return -EINVAL; |
| |
| priv = devm_kzalloc(&pdev->dev, sizeof(struct sh_csi2), GFP_KERNEL); |
| if (!priv) |
| return -ENOMEM; |
| |
| res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| /* Interrupt unused so far */ |
| irq = platform_get_irq(pdev, 0); |
| |
| if (!res || (int)irq <= 0) { |
| dev_err(&pdev->dev, "Not enough CSI2 platform resources.\n"); |
| return -ENODEV; |
| } |
| |
| /* TODO: Add support for CSI2I. Careful: different register layout! */ |
| if (pdata->type != SH_CSI2C) { |
| dev_err(&pdev->dev, "Only CSI2C supported ATM.\n"); |
| return -EINVAL; |
| } |
| |
| priv->irq = irq; |
| |
| priv->base = devm_ioremap_resource(&pdev->dev, res); |
| if (IS_ERR(priv->base)) |
| return PTR_ERR(priv->base); |
| |
| priv->pdev = pdev; |
| priv->subdev.owner = THIS_MODULE; |
| priv->subdev.dev = &pdev->dev; |
| platform_set_drvdata(pdev, &priv->subdev); |
| |
| v4l2_subdev_init(&priv->subdev, &sh_csi2_subdev_ops); |
| v4l2_set_subdevdata(&priv->subdev, &pdev->dev); |
| |
| snprintf(priv->subdev.name, V4L2_SUBDEV_NAME_SIZE, "%s.mipi-csi", |
| dev_name(&pdev->dev)); |
| |
| ret = v4l2_async_register_subdev(&priv->subdev); |
| if (ret < 0) |
| return ret; |
| |
| pm_runtime_enable(&pdev->dev); |
| |
| dev_dbg(&pdev->dev, "CSI2 probed.\n"); |
| |
| return 0; |
| } |
| |
| static int sh_csi2_remove(struct platform_device *pdev) |
| { |
| struct v4l2_subdev *subdev = platform_get_drvdata(pdev); |
| struct sh_csi2 *priv = container_of(subdev, struct sh_csi2, subdev); |
| |
| v4l2_async_unregister_subdev(&priv->subdev); |
| pm_runtime_disable(&pdev->dev); |
| |
| return 0; |
| } |
| |
| static struct platform_driver __refdata sh_csi2_pdrv = { |
| .remove = sh_csi2_remove, |
| .probe = sh_csi2_probe, |
| .driver = { |
| .name = "sh-mobile-csi2", |
| }, |
| }; |
| |
| module_platform_driver(sh_csi2_pdrv); |
| |
| MODULE_DESCRIPTION("SH-Mobile MIPI CSI-2 driver"); |
| MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>"); |
| MODULE_LICENSE("GPL v2"); |
| MODULE_ALIAS("platform:sh-mobile-csi2"); |