text: /*
   * Copyright (C) 2012 Samsung Electronics Co.Ltd
   * Authors:
   *	YoungJun Cho <yj44.cho@samsung.com>
   *	Eunchul Kim <chulspro.kim@samsung.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 Foundationr
   */
  
  #include <linux/kernel.h>
  #include <linux/component.h>
  #include <linux/err.h>
  #include <linux/interrupt.h>
  #include <linux/io.h>
  #include <linux/platform_device.h>
  #include <linux/clk.h>
  #include <linux/of_device.h>
  #include <linux/pm_runtime.h>
  
  #include <drm/drmP.h>
  #include <drm/exynos_drm.h>
  #include "regs-rotator.h"
  #include "exynos_drm_drv.h"
  #include "exynos_drm_iommu.h"
  #include "exynos_drm_ipp.h"
  
  /*
   * Rotator supports image crop/rotator and input/output DMA operations.
   * input DMA reads image data from the memory.
   * output DMA writes image data to memory.
   */
  
  #define ROTATOR_AUTOSUSPEND_DELAY	2000
  
  #define rot_read(offset)	readl(rot->regs + (offset))
  #define rot_write(cfg, offset)	writel(cfg, rot->regs + (offset))
  
  enum rot_irq_status {
  	ROT_IRQ_STATUS_COMPLETE	= 8,
  	ROT_IRQ_STATUS_ILLEGAL	= 9,
  };
  
  struct rot_variant {
  	const struct exynos_drm_ipp_formats *formats;
  	unsigned int	num_formats;
  };
  
  /*
   * A structure of rotator context.
   * @ippdrv: prepare initialization using ippdrv.
   * @regs: memory mapped io registers.
   * @clock: rotator gate clock.
   * @limit_tbl: limitation of rotator.
   * @irq: irq number.
   */
  struct rot_context {
  	struct exynos_drm_ipp ipp;
  	struct drm_device *drm_dev;
  	struct device	*dev;
  	void __iomem	*regs;
  	struct clk	*clock;
  	const struct exynos_drm_ipp_formats *formats;
  	unsigned int	num_formats;
  	struct exynos_drm_ipp_task	*task;
  };
  
  static void rotator_reg_set_irq(struct rot_context *rot, bool enable)
  {
  	u32 val = rot_read(ROT_CONFIG);
  
  	if (enable == true)
  		val |= ROT_CONFIG_IRQ;
  	else
  		val &= ~ROT_CONFIG_IRQ;
  
  	rot_write(val, ROT_CONFIG);
  }
  
  static enum rot_irq_status rotator_reg_get_irq_status(struct rot_context *rot)
  {
  	u32 val = rot_read(ROT_STATUS);
  
  	val = ROT_STATUS_IRQ(val);
  
  	if (val == ROT_STATUS_IRQ_VAL_COMPLETE)
  		return ROT_IRQ_STATUS_COMPLETE;
  
  	return ROT_IRQ_STATUS_ILLEGAL;
  }
  
  static irqreturn_t rotator_irq_handler(int irq, void *arg)
  {
  	struct rot_context *rot = arg;
  	enum rot_irq_status irq_status;
  	u32 val;
  
  	/* Get execution result */
  	irq_status = rotator_reg_get_irq_status(rot);
  
  	/* clear status */
  	val = rot_read(ROT_STATUS);
  	val |= ROT_STATUS_IRQ_PENDING((u32)irq_status);
  	rot_write(val, ROT_STATUS);
  
  	if (rot->task) {
  		struct exynos_drm_ipp_task *task = rot->task;
  
  		rot->task = NULL;
  		pm_runtime_mark_last_busy(rot->dev);
  		pm_runtime_put_autosuspend(rot->dev);
  		exynos_drm_ipp_task_done(task,
  			irq_status == ROT_IRQ_STATUS_COMPLETE ? 0 : -EINVAL);
  	}
  
  	return IRQ_HANDLED;
  }
  
  static void rotator_src_set_fmt(struct rot_context *rot, u32 fmt)
  {
  	u32 val;
  
  	val = rot_read(ROT_CONTROL);
  	val &= ~ROT_CONTROL_FMT_MASK;
  
  	switch (fmt) {
  	case DRM_FORMAT_NV12:
  		val |= ROT_CONTROL_FMT_YCBCR420_2P;
  		break;
  	case DRM_FORMAT_XRGB8888:
  		val |= ROT_CONTROL_FMT_RGB888;
  		break;
  	}
  
  	rot_write(val, ROT_CONTROL);
  }
  
  static void rotator_src_set_buf(struct rot_context *rot,
  				struct exynos_drm_ipp_buffer *buf)
  {
  	u32 val;
  
  	/* Set buffer size configuration */
  	val = ROT_SET_BUF_SIZE_H(buf->buf.height) |
  	      ROT_SET_BUF_SIZE_W(buf->buf.pitch[0] / buf->format->cpp[0]);
  	rot_write(val, ROT_SRC_BUF_SIZE);
  
  	/* Set crop image position configuration */
  	val = ROT_CROP_POS_Y(buf->rect.y) | ROT_CROP_POS_X(buf->rect.x);
  	rot_write(val, ROT_SRC_CROP_POS);
  	val = ROT_SRC_CROP_SIZE_H(buf->rect.h) |
  	      ROT_SRC_CROP_SIZE_W(buf->rect.w);
  	rot_write(val, ROT_SRC_CROP_SIZE);
  
  	/* Set buffer DMA address */
  	rot_write(buf->dma_addr[0], ROT_SRC_BUF_ADDR(0));
  	rot_write(buf->dma_addr[1], ROT_SRC_BUF_ADDR(1));
  }
  
  static void rotator_dst_set_transf(struct rot_context *rot,
  				   unsigned int rotation)
  {
  	u32 val;
  
  	/* Set transform configuration */
  	val = rot_read(ROT_CONTROL);
  	val &= ~ROT_CONTROL_FLIP_MASK;
  
  	if (rotation & DRM_MODE_REFLECT_X)
  		val |= ROT_CONTROL_FLIP_VERTICAL;
  	if (rotation & DRM_MODE_REFLECT_Y)
  		val |= ROT_CONTROL_FLIP_HORIZONTAL;
  
  	val &= ~ROT_CONTROL_ROT_MASK;
  
  	if (rotation & DRM_MODE_ROTATE_90)
  		val |= ROT_CONTROL_ROT_90;
  	else if (rotation & DRM_MODE_ROTATE_180)
  		val |= ROT_CONTROL_ROT_180;
  	else if (rotation & DRM_MODE_ROTATE_270)
  		val |= ROT_CONTROL_ROT_270;
  
  	rot_write(val, ROT_CONTROL);
  }
  
  static void rotator_dst_set_buf(struct rot_context *rot,
  				struct exynos_drm_ipp_buffer *buf)
  {
  	u32 val;
  
  	/* Set buffer size configuration */
  	val = ROT_SET_BUF_SIZE_H(buf->buf.height) |
  	      ROT_SET_BUF_SIZE_W(buf->buf.pitch[0] / buf->format->cpp[0]);
  	rot_write(val, ROT_DST_BUF_SIZE);
  
  	/* Set crop image position configuration */
  	val = ROT_CROP_POS_Y(buf->rect.y) | ROT_CROP_POS_X(buf->rect.x);
  	rot_write(val, ROT_DST_CROP_POS);
  
  	/* Set buffer DMA address */
  	rot_write(buf->dma_addr[0], ROT_DST_BUF_ADDR(0));
  	rot_write(buf->dma_addr[1], ROT_DST_BUF_ADDR(1));
  }
  
  static void rotator_start(struct rot_context *rot)
  {
  	u32 val;
  
  	/* Set interrupt enable */
  	rotator_reg_set_irq(rot, true);
  
  	val = rot_read(ROT_CONTROL);
  	val |= ROT_CONTROL_START;
  	rot_write(val, ROT_CONTROL);
  }
  
  static int rotator_commit(struct exynos_drm_ipp *ipp,
  			  struct exynos_drm_ipp_task *task)
  {
  	struct rot_context *rot =
  			container_of(ipp, struct rot_context, ipp);
  
  	pm_runtime_get_sync(rot->dev);
  	rot->task = task;
  
  	rotator_src_set_fmt(rot, task->src.buf.fourcc);
  	rotator_src_set_buf(rot, &task->src);
  	rotator_dst_set_transf(rot, task->transform.rotation);
  	rotator_dst_set_buf(rot, &task->dst);
  	rotator_start(rot);
  
  	return 0;
  }
  
  static const struct exynos_drm_ipp_funcs ipp_funcs = {
  	.commit = rotator_commit,
  };
  
  static int rotator_bind(struct device *dev, struct device *master, void *data)
  {
  	struct rot_context *rot = dev_get_drvdata(dev);
  	struct drm_device *drm_dev = data;
  	struct exynos_drm_ipp *ipp = &rot->ipp;
  
  	rot->drm_dev = drm_dev;
  	drm_iommu_attach_device(drm_dev, dev);
  
  	exynos_drm_ipp_register(drm_dev, ipp, &ipp_funcs,
  			   DRM_EXYNOS_IPP_CAP_CROP | DRM_EXYNOS_IPP_CAP_ROTATE,
  			   rot->formats, rot->num_formats, "rotator");
  
  	dev_info(dev, "The exynos rotator has been probed successfully\n");
  
  	return 0;
  }
  
  static void rotator_unbind(struct device *dev, struct device *master,
  			void *data)
  {
  	struct rot_context *rot = dev_get_drvdata(dev);
  	struct drm_device *drm_dev = data;
  	struct exynos_drm_ipp *ipp = &rot->ipp;
  
  	exynos_drm_ipp_unregister(drm_dev, ipp);
  	drm_iommu_detach_device(rot->drm_dev, rot->dev);
  }
  
  static const struct component_ops rotator_component_ops = {
  	.bind	= rotator_bind,
  	.unbind = rotator_unbind,
  };
  
  static int rotator_probe(struct platform_device *pdev)
  {
  	struct device *dev = &pdev->dev;
  	struct resource	*regs_res;
  	struct rot_context *rot;
  	const struct rot_variant *variant;
  	int irq;
  	int ret;
  
  	rot = devm_kzalloc(dev, sizeof(*rot), GFP_KERNEL);
  	if (!rot)
  		return -ENOMEM;
  
  	variant = of_device_get_match_data(dev);
  	rot->formats = variant->formats;
  	rot->num_formats = variant->num_formats;
  	rot->dev = dev;
  	regs_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  	rot->regs = devm_ioremap_resource(dev, regs_res);
  	if (IS_ERR(rot->regs))
  		return PTR_ERR(rot->regs);
  
  	irq = platform_get_irq(pdev, 0);
  	if (irq < 0) {
  		dev_err(dev, "failed to get irq\n");
  		return irq;
  	}
  
  	ret = devm_request_irq(dev, irq, rotator_irq_handler, 0, dev_name(dev),
  			       rot);
  	if (ret < 0) {
  		dev_err(dev, "failed to request irq\n");
  		return ret;
  	}
  
  	rot->clock = devm_clk_get(dev, "rotator");
  	if (IS_ERR(rot->clock)) {
  		dev_err(dev, "failed to get clock\n");
  		return PTR_ERR(rot->clock);
  	}
  
  	pm_runtime_use_autosuspend(dev);
  	pm_runtime_set_autosuspend_delay(dev, ROTATOR_AUTOSUSPEND_DELAY);
  	pm_runtime_enable(dev);
  	platform_set_drvdata(pdev, rot);
  
  	ret = component_add(dev, &rotator_component_ops);
  	if (ret)
  		goto err_component;
  
  	return 0;
  
  err_component:
  	pm_runtime_dont_use_autosuspend(dev);
  	pm_runtime_disable(dev);
  	return ret;
  }
  
  static int rotator_remove(struct platform_device *pdev)
  {
  	struct device *dev = &pdev->dev;
  
  	component_del(dev, &rotator_component_ops);
  	pm_runtime_dont_use_autosuspend(dev);
  	pm_runtime_disable(dev);
  
  	return 0;
  }
  
  #ifdef CONFIG_PM
  static int rotator_runtime_suspend(struct device *dev)
  {
  	struct rot_context *rot = dev_get_drvdata(dev);
  
  	clk_disable_unprepare(rot->clock);
  	return 0;
  }
  
  static int rotator_runtime_resume(struct device *dev)
  {
  	struct rot_context *rot = dev_get_drvdata(dev);
  
  	return clk_prepare_enable(rot->clock);
  }
  #endif
  
  static const struct drm_exynos_ipp_limit rotator_4210_rbg888_limits[] = {
  	{ IPP_SIZE_LIMIT(BUFFER, .h = { 8, SZ_16K }, .v = { 8, SZ_16K }) },
  	{ IPP_SIZE_LIMIT(AREA, .h.align = 4, .v.align = 4) },
  };
  
  static const struct drm_exynos_ipp_limit rotator_4412_rbg888_limits[] = {
  	{ IPP_SIZE_LIMIT(BUFFER, .h = { 8, SZ_8K }, .v = { 8, SZ_8K }) },
  	{ IPP_SIZE_LIMIT(AREA, .h.align = 4, .v.align = 4) },
  };
  
  static const struct drm_exynos_ipp_limit rotator_5250_rbg888_limits[] = {
  	{ IPP_SIZE_LIMIT(BUFFER, .h = { 8, SZ_8K }, .v = { 8, SZ_8K }) },
  	{ IPP_SIZE_LIMIT(AREA, .h.align = 2, .v.align = 2) },
  };
  
  static const struct drm_exynos_ipp_limit rotator_4210_yuv_limits[] = {
  	{ IPP_SIZE_LIMIT(BUFFER, .h = { 32, SZ_64K }, .v = { 32, SZ_64K }) },
  	{ IPP_SIZE_LIMIT(AREA, .h.align = 8, .v.align = 8) },
  };
  
  static const struct drm_exynos_ipp_limit rotator_4412_yuv_limits[] = {
  	{ IPP_SIZE_LIMIT(BUFFER, .h = { 32, SZ_32K }, .v = { 32, SZ_32K }) },
  	{ IPP_SIZE_LIMIT(AREA, .h.align = 8, .v.align = 8) },
  };
  
  static const struct exynos_drm_ipp_formats rotator_4210_formats[] = {
  	{ IPP_SRCDST_FORMAT(XRGB8888, rotator_4210_rbg888_limits) },
  	{ IPP_SRCDST_FORMAT(NV12, rotator_4210_yuv_limits) },
  };
  
  static const struct exynos_drm_ipp_formats rotator_4412_formats[] = {
  	{ IPP_SRCDST_FORMAT(XRGB8888, rotator_4412_rbg888_limits) },
  	{ IPP_SRCDST_FORMAT(NV12, rotator_4412_yuv_limits) },
  };
  
  static const struct exynos_drm_ipp_formats rotator_5250_formats[] = {
  	{ IPP_SRCDST_FORMAT(XRGB8888, rotator_5250_rbg888_limits) },
  	{ IPP_SRCDST_FORMAT(NV12, rotator_4412_yuv_limits) },
  };
  
  static const struct rot_variant rotator_4210_data = {
  	.formats = rotator_4210_formats,
  	.num_formats = ARRAY_SIZE(rotator_4210_formats),
  };
  
  static const struct rot_variant rotator_4412_data = {
  	.formats = rotator_4412_formats,
  	.num_formats = ARRAY_SIZE(rotator_4412_formats),
  };
  
  static const struct rot_variant rotator_5250_data = {
  	.formats = rotator_5250_formats,
  	.num_formats = ARRAY_SIZE(rotator_5250_formats),
  };
  
  static const struct of_device_id exynos_rotator_match[] = {
  	{
  		.compatible = "samsung,exynos4210-rotator",
  		.data = &rotator_4210_data,
  	}, {
  		.compatible = "samsung,exynos4212-rotator",
  		.data = &rotator_4412_data,
  	}, {
  		.compatible = "samsung,exynos5250-rotator",
  		.data = &rotator_5250_data,
  	}, {
  	},
  };
  MODULE_DEVICE_TABLE(of, exynos_rotator_match);
  
  static const struct dev_pm_ops rotator_pm_ops = {
  	SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
  				pm_runtime_force_resume)
  	SET_RUNTIME_PM_OPS(rotator_runtime_suspend, rotator_runtime_resume,
  									NULL)
  };
  
  struct platform_driver rotator_driver = {
  	.probe		= rotator_probe,
  	.remove		= rotator_remove,
  	.driver		= {
  		.name	= "exynos-rotator",
  		.owner	= THIS_MODULE,
  		.pm	= &rotator_pm_ops,
  		.of_match_table = exynos_rotator_match,
  	},
  };
  