--- /dev/null
+/*
+ * 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");
Code Review / kvmfornfv.git / blobdiff