drivers/gpu/ipu-v3/ipu-common.c

/*
 * Copyright (c) 2010 Sascha Hauer <s.hauer@pengutronix.de>
 * Copyright (C) 2005-2009 Freescale Semiconductor, Inc.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * for more details.
 */
#include <linux/module.h>
#include <linux/export.h>
#include <linux/types.h>
#include <linux/reset.h>
#include <linux/platform_device.h>
#include <linux/err.h>
#include <linux/spinlock.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/clk.h>
#include <linux/list.h>
#include <linux/irq.h>
#include <linux/irqchip/chained_irq.h>
#include <linux/irqdomain.h>
#include <linux/of_device.h>

#include <drm/drm_fourcc.h>

#include <video/imx-ipu-v3.h>
#include "ipu-prv.h"

static inline u32 ipu_cm_read(struct ipu_soc *ipu, unsigned offset)
{
	return readl(ipu->cm_reg + offset);
}

static inline void ipu_cm_write(struct ipu_soc *ipu, u32 value, unsigned offset)
{
	writel(value, ipu->cm_reg + offset);
}

void ipu_srm_dp_sync_update(struct ipu_soc *ipu)
{
	u32 val;

	val = ipu_cm_read(ipu, IPU_SRM_PRI2);
	val |= 0x8;
	ipu_cm_write(ipu, val, IPU_SRM_PRI2);
}
EXPORT_SYMBOL_GPL(ipu_srm_dp_sync_update);

enum ipu_color_space ipu_drm_fourcc_to_colorspace(u32 drm_fourcc)
{
	switch (drm_fourcc) {
	case DRM_FORMAT_RGB565:
	case DRM_FORMAT_BGR565:
	case DRM_FORMAT_RGB888:
	case DRM_FORMAT_BGR888:
	case DRM_FORMAT_XRGB8888:
	case DRM_FORMAT_XBGR8888:
	case DRM_FORMAT_RGBX8888:
	case DRM_FORMAT_BGRX8888:
	case DRM_FORMAT_ARGB8888:
	case DRM_FORMAT_ABGR8888:
	case DRM_FORMAT_RGBA8888:
	case DRM_FORMAT_BGRA8888:
		return IPUV3_COLORSPACE_RGB;
	case DRM_FORMAT_YUYV:
	case DRM_FORMAT_UYVY:
	case DRM_FORMAT_YUV420:
	case DRM_FORMAT_YVU420:
		return IPUV3_COLORSPACE_YUV;
	default:
		return IPUV3_COLORSPACE_UNKNOWN;
	}
}
EXPORT_SYMBOL_GPL(ipu_drm_fourcc_to_colorspace);

enum ipu_color_space ipu_pixelformat_to_colorspace(u32 pixelformat)
{
	switch (pixelformat) {
	case V4L2_PIX_FMT_YUV420:
	case V4L2_PIX_FMT_YVU420:
	case V4L2_PIX_FMT_UYVY:
	case V4L2_PIX_FMT_YUYV:
		return IPUV3_COLORSPACE_YUV;
	case V4L2_PIX_FMT_RGB32:
	case V4L2_PIX_FMT_BGR32:
	case V4L2_PIX_FMT_RGB24:
	case V4L2_PIX_FMT_BGR24:
	case V4L2_PIX_FMT_RGB565:
		return IPUV3_COLORSPACE_RGB;
	default:
		return IPUV3_COLORSPACE_UNKNOWN;
	}
}
EXPORT_SYMBOL_GPL(ipu_pixelformat_to_colorspace);

struct ipuv3_channel *ipu_idmac_get(struct ipu_soc *ipu, unsigned num)
{
	struct ipuv3_channel *channel;

	dev_dbg(ipu->dev, "%s %d\n", __func__, num);

	if (num > 63)
		return ERR_PTR(-ENODEV);

	mutex_lock(&ipu->channel_lock);

	channel = &ipu->channel[num];

	if (channel->busy) {
		channel = ERR_PTR(-EBUSY);
		goto out;
	}

	channel->busy = true;
	channel->num = num;

out:
	mutex_unlock(&ipu->channel_lock);

	return channel;
}
EXPORT_SYMBOL_GPL(ipu_idmac_get);

void ipu_idmac_put(struct ipuv3_channel *channel)
{
	struct ipu_soc *ipu = channel->ipu;

	dev_dbg(ipu->dev, "%s %d\n", __func__, channel->num);

	mutex_lock(&ipu->channel_lock);

	channel->busy = false;

	mutex_unlock(&ipu->channel_lock);
}
EXPORT_SYMBOL_GPL(ipu_idmac_put);

#define idma_mask(ch)			(1 << (ch & 0x1f))

void ipu_idmac_set_double_buffer(struct ipuv3_channel *channel,
		bool doublebuffer)
{
	struct ipu_soc *ipu = channel->ipu;
	unsigned long flags;
	u32 reg;

	spin_lock_irqsave(&ipu->lock, flags);

	reg = ipu_cm_read(ipu, IPU_CHA_DB_MODE_SEL(channel->num));
	if (doublebuffer)
		reg |= idma_mask(channel->num);
	else
		reg &= ~idma_mask(channel->num);
	ipu_cm_write(ipu, reg, IPU_CHA_DB_MODE_SEL(channel->num));

	spin_unlock_irqrestore(&ipu->lock, flags);
}
EXPORT_SYMBOL_GPL(ipu_idmac_set_double_buffer);

int ipu_module_enable(struct ipu_soc *ipu, u32 mask)
{
	unsigned long lock_flags;
	u32 val;

	spin_lock_irqsave(&ipu->lock, lock_flags);

	val = ipu_cm_read(ipu, IPU_DISP_GEN);

	if (mask & IPU_CONF_DI0_EN)
		val |= IPU_DI0_COUNTER_RELEASE;
	if (mask & IPU_CONF_DI1_EN)
		val |= IPU_DI1_COUNTER_RELEASE;

	ipu_cm_write(ipu, val, IPU_DISP_GEN);

	val = ipu_cm_read(ipu, IPU_CONF);
	val |= mask;
	ipu_cm_write(ipu, val, IPU_CONF);

	spin_unlock_irqrestore(&ipu->lock, lock_flags);

	return 0;
}
EXPORT_SYMBOL_GPL(ipu_module_enable);

int ipu_module_disable(struct ipu_soc *ipu, u32 mask)
{
	unsigned long lock_flags;
	u32 val;

	spin_lock_irqsave(&ipu->lock, lock_flags);

	val = ipu_cm_read(ipu, IPU_CONF);
	val &= ~mask;
	ipu_cm_write(ipu, val, IPU_CONF);

	val = ipu_cm_read(ipu, IPU_DISP_GEN);

	if (mask & IPU_CONF_DI0_EN)
		val &= ~IPU_DI0_COUNTER_RELEASE;
	if (mask & IPU_CONF_DI1_EN)
		val &= ~IPU_DI1_COUNTER_RELEASE;

	ipu_cm_write(ipu, val, IPU_DISP_GEN);

	spin_unlock_irqrestore(&ipu->lock, lock_flags);

	return 0;
}
EXPORT_SYMBOL_GPL(ipu_module_disable);

int ipu_csi_enable(struct ipu_soc *ipu, int csi)
{
	return ipu_module_enable(ipu, csi ? IPU_CONF_CSI1_EN : IPU_CONF_CSI0_EN);
}
EXPORT_SYMBOL_GPL(ipu_csi_enable);

int ipu_csi_disable(struct ipu_soc *ipu, int csi)
{
	return ipu_module_disable(ipu, csi ? IPU_CONF_CSI1_EN : IPU_CONF_CSI0_EN);
}
EXPORT_SYMBOL_GPL(ipu_csi_disable);

int ipu_smfc_enable(struct ipu_soc *ipu)
{
	return ipu_module_enable(ipu, IPU_CONF_SMFC_EN);
}
EXPORT_SYMBOL_GPL(ipu_smfc_enable);

int ipu_smfc_disable(struct ipu_soc *ipu)
{
	return ipu_module_disable(ipu, IPU_CONF_SMFC_EN);
}
EXPORT_SYMBOL_GPL(ipu_smfc_disable);

int ipu_idmac_get_current_buffer(struct ipuv3_channel *channel)
{
	struct ipu_soc *ipu = channel->ipu;
	unsigned int chno = channel->num;

	return (ipu_cm_read(ipu, IPU_CHA_CUR_BUF(chno)) & idma_mask(chno)) ? 1 : 0;
}
EXPORT_SYMBOL_GPL(ipu_idmac_get_current_buffer);

void ipu_idmac_select_buffer(struct ipuv3_channel *channel, u32 buf_num)
{
	struct ipu_soc *ipu = channel->ipu;
	unsigned int chno = channel->num;
	unsigned long flags;

	spin_lock_irqsave(&ipu->lock, flags);

	/* Mark buffer as ready. */
	if (buf_num == 0)
		ipu_cm_write(ipu, idma_mask(chno), IPU_CHA_BUF0_RDY(chno));
	else
		ipu_cm_write(ipu, idma_mask(chno), IPU_CHA_BUF1_RDY(chno));

	spin_unlock_irqrestore(&ipu->lock, flags);
}
EXPORT_SYMBOL_GPL(ipu_idmac_select_buffer);

int ipu_idmac_enable_channel(struct ipuv3_channel *channel)
{
	struct ipu_soc *ipu = channel->ipu;
	u32 val;
	unsigned long flags;

	spin_lock_irqsave(&ipu->lock, flags);

	val = ipu_idmac_read(ipu, IDMAC_CHA_EN(channel->num));
	val |= idma_mask(channel->num);
	ipu_idmac_write(ipu, val, IDMAC_CHA_EN(channel->num));

	spin_unlock_irqrestore(&ipu->lock, flags);

	return 0;
}
EXPORT_SYMBOL_GPL(ipu_idmac_enable_channel);

bool ipu_idmac_channel_busy(struct ipu_soc *ipu, unsigned int chno)
{
	return (ipu_idmac_read(ipu, IDMAC_CHA_BUSY(chno)) & idma_mask(chno));
}
EXPORT_SYMBOL_GPL(ipu_idmac_channel_busy);

int ipu_idmac_wait_busy(struct ipuv3_channel *channel, int ms)
{
	struct ipu_soc *ipu = channel->ipu;
	unsigned long timeout;

	timeout = jiffies + msecs_to_jiffies(ms);
	while (ipu_idmac_read(ipu, IDMAC_CHA_BUSY(channel->num)) &
			idma_mask(channel->num)) {
		if (time_after(jiffies, timeout))
			return -ETIMEDOUT;
		cpu_relax();
	}

	return 0;
}
EXPORT_SYMBOL_GPL(ipu_idmac_wait_busy);

int ipu_wait_interrupt(struct ipu_soc *ipu, int irq, int ms)
{
	unsigned long timeout;

	timeout = jiffies + msecs_to_jiffies(ms);
	ipu_cm_write(ipu, BIT(irq % 32), IPU_INT_STAT(irq / 32));
	while (!(ipu_cm_read(ipu, IPU_INT_STAT(irq / 32) & BIT(irq % 32)))) {
		if (time_after(jiffies, timeout))
			return -ETIMEDOUT;
		cpu_relax();
	}

	return 0;
}
EXPORT_SYMBOL_GPL(ipu_wait_interrupt);

int ipu_idmac_disable_channel(struct ipuv3_channel *channel)
{
	struct ipu_soc *ipu = channel->ipu;
	u32 val;
	unsigned long flags;

	spin_lock_irqsave(&ipu->lock, flags);

	/* Disable DMA channel(s) */
	val = ipu_idmac_read(ipu, IDMAC_CHA_EN(channel->num));
	val &= ~idma_mask(channel->num);
	ipu_idmac_write(ipu, val, IDMAC_CHA_EN(channel->num));

	/* Set channel buffers NOT to be ready */
	ipu_cm_write(ipu, 0xf0000000, IPU_GPR); /* write one to clear */

	if (ipu_cm_read(ipu, IPU_CHA_BUF0_RDY(channel->num)) &
			idma_mask(channel->num)) {
		ipu_cm_write(ipu, idma_mask(channel->num),
			     IPU_CHA_BUF0_RDY(channel->num));
	}

	if (ipu_cm_read(ipu, IPU_CHA_BUF1_RDY(channel->num)) &
			idma_mask(channel->num)) {
		ipu_cm_write(ipu, idma_mask(channel->num),
			     IPU_CHA_BUF1_RDY(channel->num));
	}

	ipu_cm_write(ipu, 0x0, IPU_GPR); /* write one to set */

	/* Reset the double buffer */
	val = ipu_cm_read(ipu, IPU_CHA_DB_MODE_SEL(channel->num));
	val &= ~idma_mask(channel->num);
	ipu_cm_write(ipu, val, IPU_CHA_DB_MODE_SEL(channel->num));

	spin_unlock_irqrestore(&ipu->lock, flags);

	return 0;
}
EXPORT_SYMBOL_GPL(ipu_idmac_disable_channel);

static int ipu_memory_reset(struct ipu_soc *ipu)
{
	unsigned long timeout;

	ipu_cm_write(ipu, 0x807FFFFF, IPU_MEM_RST);

	timeout = jiffies + msecs_to_jiffies(1000);
	while (ipu_cm_read(ipu, IPU_MEM_RST) & 0x80000000) {
		if (time_after(jiffies, timeout))
			return -ETIME;
		cpu_relax();
	}

	return 0;
}

/*
 * Set the source mux for the given CSI. Selects either parallel or
 * MIPI CSI2 sources.
 */
void ipu_set_csi_src_mux(struct ipu_soc *ipu, int csi_id, bool mipi_csi2)
{
	unsigned long flags;
	u32 val, mask;

	mask = (csi_id == 1) ? IPU_CONF_CSI1_DATA_SOURCE :
		IPU_CONF_CSI0_DATA_SOURCE;

	spin_lock_irqsave(&ipu->lock, flags);

	val = ipu_cm_read(ipu, IPU_CONF);
	if (mipi_csi2)
		val |= mask;
	else
		val &= ~mask;
	ipu_cm_write(ipu, val, IPU_CONF);

	spin_unlock_irqrestore(&ipu->lock, flags);
}
EXPORT_SYMBOL_GPL(ipu_set_csi_src_mux);

/*
 * Set the source mux for the IC. Selects either CSI[01] or the VDI.
 */
void ipu_set_ic_src_mux(struct ipu_soc *ipu, int csi_id, bool vdi)
{
	unsigned long flags;
	u32 val;

	spin_lock_irqsave(&ipu->lock, flags);

	val = ipu_cm_read(ipu, IPU_CONF);
	if (vdi) {
		val |= IPU_CONF_IC_INPUT;
	} else {
		val &= ~IPU_CONF_IC_INPUT;
		if (csi_id == 1)
			val |= IPU_CONF_CSI_SEL;
		else
			val &= ~IPU_CONF_CSI_SEL;
	}
	ipu_cm_write(ipu, val, IPU_CONF);

	spin_unlock_irqrestore(&ipu->lock, flags);
}
EXPORT_SYMBOL_GPL(ipu_set_ic_src_mux);

struct ipu_devtype {
	const char *name;
	unsigned long cm_ofs;
	unsigned long cpmem_ofs;
	unsigned long srm_ofs;
	unsigned long tpm_ofs;
	unsigned long disp0_ofs;
	unsigned long disp1_ofs;
	unsigned long dc_tmpl_ofs;
	unsigned long vdi_ofs;
	enum ipuv3_type type;
};

static struct ipu_devtype ipu_type_imx51 = {
	.name = "IPUv3EX",
	.cm_ofs = 0x1e000000,
	.cpmem_ofs = 0x1f000000,
	.srm_ofs = 0x1f040000,
	.tpm_ofs = 0x1f060000,
	.disp0_ofs = 0x1e040000,
	.disp1_ofs = 0x1e048000,
	.dc_tmpl_ofs = 0x1f080000,
	.vdi_ofs = 0x1e068000,
	.type = IPUV3EX,
};

static struct ipu_devtype ipu_type_imx53 = {
	.name = "IPUv3M",
	.cm_ofs = 0x06000000,
	.cpmem_ofs = 0x07000000,
	.srm_ofs = 0x07040000,
	.tpm_ofs = 0x07060000,
	.disp0_ofs = 0x06040000,
	.disp1_ofs = 0x06048000,
	.dc_tmpl_ofs = 0x07080000,
	.vdi_ofs = 0x06068000,
	.type = IPUV3M,
};

static struct ipu_devtype ipu_type_imx6q = {
	.name = "IPUv3H",
	.cm_ofs = 0x00200000,
	.cpmem_ofs = 0x00300000,
	.srm_ofs = 0x00340000,
	.tpm_ofs = 0x00360000,
	.disp0_ofs = 0x00240000,
	.disp1_ofs = 0x00248000,
	.dc_tmpl_ofs = 0x00380000,
	.vdi_ofs = 0x00268000,
	.type = IPUV3H,
};

static const struct of_device_id imx_ipu_dt_ids[] = {
	{ .compatible = "fsl,imx51-ipu", .data = &ipu_type_imx51, },
	{ .compatible = "fsl,imx53-ipu", .data = &ipu_type_imx53, },
	{ .compatible = "fsl,imx6q-ipu", .data = &ipu_type_imx6q, },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, imx_ipu_dt_ids);

static int ipu_submodules_init(struct ipu_soc *ipu,
		struct platform_device *pdev, unsigned long ipu_base,
		struct clk *ipu_clk)
{
	char *unit;
	int ret;
	struct device *dev = &pdev->dev;
	const struct ipu_devtype *devtype = ipu->devtype;

	ret = ipu_cpmem_init(ipu, dev, ipu_base + devtype->cpmem_ofs);
	if (ret) {
		unit = "cpmem";
		goto err_cpmem;
	}

	ret = ipu_di_init(ipu, dev, 0, ipu_base + devtype->disp0_ofs,
			IPU_CONF_DI0_EN, ipu_clk);
	if (ret) {
		unit = "di0";
		goto err_di_0;
	}

	ret = ipu_di_init(ipu, dev, 1, ipu_base + devtype->disp1_ofs,
			IPU_CONF_DI1_EN, ipu_clk);
	if (ret) {
		unit = "di1";
		goto err_di_1;
	}

	ret = ipu_dc_init(ipu, dev, ipu_base + devtype->cm_ofs +
			IPU_CM_DC_REG_OFS, ipu_base + devtype->dc_tmpl_ofs);
	if (ret) {
		unit = "dc_template";
		goto err_dc;
	}

	ret = ipu_dmfc_init(ipu, dev, ipu_base +
			devtype->cm_ofs + IPU_CM_DMFC_REG_OFS, ipu_clk);
	if (ret) {
		unit = "dmfc";
		goto err_dmfc;
	}

	ret = ipu_dp_init(ipu, dev, ipu_base + devtype->srm_ofs);
	if (ret) {
		unit = "dp";
		goto err_dp;
	}

	ret = ipu_smfc_init(ipu, dev, ipu_base +
			devtype->cm_ofs + IPU_CM_SMFC_REG_OFS);
	if (ret) {
		unit = "smfc";
		goto err_smfc;
	}

	return 0;

err_smfc:
	ipu_dp_exit(ipu);
err_dp:
	ipu_dmfc_exit(ipu);
err_dmfc:
	ipu_dc_exit(ipu);
err_dc:
	ipu_di_exit(ipu, 1);
err_di_1:
	ipu_di_exit(ipu, 0);
err_di_0:
	ipu_cpmem_exit(ipu);
err_cpmem:
	dev_err(&pdev->dev, "init %s failed with %d\n", unit, ret);
	return ret;
}

static void ipu_irq_handle(struct ipu_soc *ipu, const int *regs, int num_regs)
{
	unsigned long status;
	int i, bit, irq;

	for (i = 0; i < num_regs; i++) {

		status = ipu_cm_read(ipu, IPU_INT_STAT(regs[i]));
		status &= ipu_cm_read(ipu, IPU_INT_CTRL(regs[i]));

		for_each_set_bit(bit, &status, 32) {
			irq = irq_linear_revmap(ipu->domain,
						regs[i] * 32 + bit);
			if (irq)
				generic_handle_irq(irq);
		}
	}
}

static void ipu_irq_handler(unsigned int irq, struct irq_desc *desc)
{
	struct ipu_soc *ipu = irq_desc_get_handler_data(desc);
	const int int_reg[] = { 0, 1, 2, 3, 10, 11, 12, 13, 14};
	struct irq_chip *chip = irq_get_chip(irq);

	chained_irq_enter(chip, desc);

	ipu_irq_handle(ipu, int_reg, ARRAY_SIZE(int_reg));

	chained_irq_exit(chip, desc);
}

static void ipu_err_irq_handler(unsigned int irq, struct irq_desc *desc)
{
	struct ipu_soc *ipu = irq_desc_get_handler_data(desc);
	const int int_reg[] = { 4, 5, 8, 9};
	struct irq_chip *chip = irq_get_chip(irq);

	chained_irq_enter(chip, desc);

	ipu_irq_handle(ipu, int_reg, ARRAY_SIZE(int_reg));

	chained_irq_exit(chip, desc);
}

int ipu_map_irq(struct ipu_soc *ipu, int irq)
{
	int virq;

	virq = irq_linear_revmap(ipu->domain, irq);
	if (!virq)
		virq = irq_create_mapping(ipu->domain, irq);

	return virq;
}
EXPORT_SYMBOL_GPL(ipu_map_irq);

int ipu_idmac_channel_irq(struct ipu_soc *ipu, struct ipuv3_channel *channel,
		enum ipu_channel_irq irq_type)
{
	return ipu_map_irq(ipu, irq_type + channel->num);
}
EXPORT_SYMBOL_GPL(ipu_idmac_channel_irq);

static void ipu_submodules_exit(struct ipu_soc *ipu)
{
	ipu_smfc_exit(ipu);
	ipu_dp_exit(ipu);
	ipu_dmfc_exit(ipu);
	ipu_dc_exit(ipu);
	ipu_di_exit(ipu, 1);
	ipu_di_exit(ipu, 0);
	ipu_cpmem_exit(ipu);
}

static int platform_remove_devices_fn(struct device *dev, void *unused)
{
	struct platform_device *pdev = to_platform_device(dev);

	platform_device_unregister(pdev);

	return 0;
}

static void platform_device_unregister_children(struct platform_device *pdev)
{
	device_for_each_child(&pdev->dev, NULL, platform_remove_devices_fn);
}

struct ipu_platform_reg {
	struct ipu_client_platformdata pdata;
	const char *name;
	int reg_offset;
};

static const struct ipu_platform_reg client_reg[] = {
	{
		.pdata = {
			.di = 0,
			.dc = 5,
			.dp = IPU_DP_FLOW_SYNC_BG,
			.dma[0] = IPUV3_CHANNEL_MEM_BG_SYNC,
			.dma[1] = IPUV3_CHANNEL_MEM_FG_SYNC,
		},
		.name = "imx-ipuv3-crtc",
	}, {
		.pdata = {
			.di = 1,
			.dc = 1,
			.dp = -EINVAL,
			.dma[0] = IPUV3_CHANNEL_MEM_DC_SYNC,
			.dma[1] = -EINVAL,
		},
		.name = "imx-ipuv3-crtc",
	}, {
		.pdata = {
			.csi = 0,
			.dma[0] = IPUV3_CHANNEL_CSI0,
			.dma[1] = -EINVAL,
		},
		.reg_offset = IPU_CM_CSI0_REG_OFS,
		.name = "imx-ipuv3-camera",
	}, {
		.pdata = {
			.csi = 1,
			.dma[0] = IPUV3_CHANNEL_CSI1,
			.dma[1] = -EINVAL,
		},
		.reg_offset = IPU_CM_CSI1_REG_OFS,
		.name = "imx-ipuv3-camera",
	},
};

static DEFINE_MUTEX(ipu_client_id_mutex);
static int ipu_client_id;

static int ipu_add_client_devices(struct ipu_soc *ipu, unsigned long ipu_base)
{
	struct device *dev = ipu->dev;
	unsigned i;
	int id, ret;

	mutex_lock(&ipu_client_id_mutex);
	id = ipu_client_id;
	ipu_client_id += ARRAY_SIZE(client_reg);
	mutex_unlock(&ipu_client_id_mutex);

	for (i = 0; i < ARRAY_SIZE(client_reg); i++) {
		const struct ipu_platform_reg *reg = &client_reg[i];
		struct platform_device *pdev;
		struct resource res;

		if (reg->reg_offset) {
			memset(&res, 0, sizeof(res));
			res.flags = IORESOURCE_MEM;
			res.start = ipu_base + ipu->devtype->cm_ofs + reg->reg_offset;
			res.end = res.start + PAGE_SIZE - 1;
			pdev = platform_device_register_resndata(dev, reg->name,
				id++, &res, 1, &reg->pdata, sizeof(reg->pdata));
		} else {
			pdev = platform_device_register_data(dev, reg->name,
				id++, &reg->pdata, sizeof(reg->pdata));
		}

		if (IS_ERR(pdev))
			goto err_register;
	}

	return 0;

err_register:
	platform_device_unregister_children(to_platform_device(dev));

	return ret;
}


static int ipu_irq_init(struct ipu_soc *ipu)
{
	struct irq_chip_generic *gc;
	struct irq_chip_type *ct;
	unsigned long unused[IPU_NUM_IRQS / 32] = {
		0x400100d0, 0xffe000fd,
		0x400100d0, 0xffe000fd,
		0x400100d0, 0xffe000fd,
		0x4077ffff, 0xffe7e1fd,
		0x23fffffe, 0x8880fff0,
		0xf98fe7d0, 0xfff81fff,
		0x400100d0, 0xffe000fd,
		0x00000000,
	};
	int ret, i;

	ipu->domain = irq_domain_add_linear(ipu->dev->of_node, IPU_NUM_IRQS,
					    &irq_generic_chip_ops, ipu);
	if (!ipu->domain) {
		dev_err(ipu->dev, "failed to add irq domain\n");
		return -ENODEV;
	}

	ret = irq_alloc_domain_generic_chips(ipu->domain, 32, 1, "IPU",
					     handle_level_irq, 0,
					     IRQF_VALID, 0);
	if (ret < 0) {
		dev_err(ipu->dev, "failed to alloc generic irq chips\n");
		irq_domain_remove(ipu->domain);
		return ret;
	}

	for (i = 0; i < IPU_NUM_IRQS; i += 32) {
		gc = irq_get_domain_generic_chip(ipu->domain, i);
		gc->reg_base = ipu->cm_reg;
		gc->unused = unused[i / 32];
		ct = gc->chip_types;
		ct->chip.irq_ack = irq_gc_ack_set_bit;
		ct->chip.irq_mask = irq_gc_mask_clr_bit;
		ct->chip.irq_unmask = irq_gc_mask_set_bit;
		ct->regs.ack = IPU_INT_STAT(i / 32);
		ct->regs.mask = IPU_INT_CTRL(i / 32);
	}

	irq_set_chained_handler(ipu->irq_sync, ipu_irq_handler);
	irq_set_handler_data(ipu->irq_sync, ipu);
	irq_set_chained_handler(ipu->irq_err, ipu_err_irq_handler);
	irq_set_handler_data(ipu->irq_err, ipu);

	return 0;
}

static void ipu_irq_exit(struct ipu_soc *ipu)
{
	int i, irq;

	irq_set_chained_handler(ipu->irq_err, NULL);
	irq_set_handler_data(ipu->irq_err, NULL);
	irq_set_chained_handler(ipu->irq_sync, NULL);
	irq_set_handler_data(ipu->irq_sync, NULL);

	/* TODO: remove irq_domain_generic_chips */

	for (i = 0; i < IPU_NUM_IRQS; i++) {
		irq = irq_linear_revmap(ipu->domain, i);
		if (irq)
			irq_dispose_mapping(irq);
	}

	irq_domain_remove(ipu->domain);
}

static int ipu_probe(struct platform_device *pdev)
{
	const struct of_device_id *of_id =
			of_match_device(imx_ipu_dt_ids, &pdev->dev);
	struct ipu_soc *ipu;
	struct resource *res;
	unsigned long ipu_base;
	int i, ret, irq_sync, irq_err;
	const struct ipu_devtype *devtype;

	devtype = of_id->data;

	irq_sync = platform_get_irq(pdev, 0);
	irq_err = platform_get_irq(pdev, 1);
	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	dev_dbg(&pdev->dev, "irq_sync: %d irq_err: %d\n",
			irq_sync, irq_err);

	if (!res || irq_sync < 0 || irq_err < 0)
		return -ENODEV;

	ipu_base = res->start;

	ipu = devm_kzalloc(&pdev->dev, sizeof(*ipu), GFP_KERNEL);
	if (!ipu)
		return -ENODEV;

	for (i = 0; i < 64; i++)
		ipu->channel[i].ipu = ipu;
	ipu->devtype = devtype;
	ipu->ipu_type = devtype->type;

	spin_lock_init(&ipu->lock);
	mutex_init(&ipu->channel_lock);

	dev_dbg(&pdev->dev, "cm_reg:   0x%08lx\n",
			ipu_base + devtype->cm_ofs);
	dev_dbg(&pdev->dev, "idmac:    0x%08lx\n",
			ipu_base + devtype->cm_ofs + IPU_CM_IDMAC_REG_OFS);
	dev_dbg(&pdev->dev, "cpmem:    0x%08lx\n",
			ipu_base + devtype->cpmem_ofs);
	dev_dbg(&pdev->dev, "disp0:    0x%08lx\n",
			ipu_base + devtype->disp0_ofs);
	dev_dbg(&pdev->dev, "disp1:    0x%08lx\n",
			ipu_base + devtype->disp1_ofs);
	dev_dbg(&pdev->dev, "srm:      0x%08lx\n",
			ipu_base + devtype->srm_ofs);
	dev_dbg(&pdev->dev, "tpm:      0x%08lx\n",
			ipu_base + devtype->tpm_ofs);
	dev_dbg(&pdev->dev, "dc:       0x%08lx\n",
			ipu_base + devtype->cm_ofs + IPU_CM_DC_REG_OFS);
	dev_dbg(&pdev->dev, "ic:       0x%08lx\n",
			ipu_base + devtype->cm_ofs + IPU_CM_IC_REG_OFS);
	dev_dbg(&pdev->dev, "dmfc:     0x%08lx\n",
			ipu_base + devtype->cm_ofs + IPU_CM_DMFC_REG_OFS);
	dev_dbg(&pdev->dev, "vdi:      0x%08lx\n",
			ipu_base + devtype->vdi_ofs);

	ipu->cm_reg = devm_ioremap(&pdev->dev,
			ipu_base + devtype->cm_ofs, PAGE_SIZE);
	ipu->idmac_reg = devm_ioremap(&pdev->dev,
			ipu_base + devtype->cm_ofs + IPU_CM_IDMAC_REG_OFS,
			PAGE_SIZE);

	if (!ipu->cm_reg || !ipu->idmac_reg)
		return -ENOMEM;

	ipu->clk = devm_clk_get(&pdev->dev, "bus");
	if (IS_ERR(ipu->clk)) {
		ret = PTR_ERR(ipu->clk);
		dev_err(&pdev->dev, "clk_get failed with %d", ret);
		return ret;
	}

	platform_set_drvdata(pdev, ipu);

	ret = clk_prepare_enable(ipu->clk);
	if (ret) {
		dev_err(&pdev->dev, "clk_prepare_enable failed: %d\n", ret);
		return ret;
	}

	ipu->dev = &pdev->dev;
	ipu->irq_sync = irq_sync;
	ipu->irq_err = irq_err;

	ret = ipu_irq_init(ipu);
	if (ret)
		goto out_failed_irq;

	ret = device_reset(&pdev->dev);
	if (ret) {
		dev_err(&pdev->dev, "failed to reset: %d\n", ret);
		goto out_failed_reset;
	}
	ret = ipu_memory_reset(ipu);
	if (ret)
		goto out_failed_reset;

	/* Set MCU_T to divide MCU access window into 2 */
	ipu_cm_write(ipu, 0x00400000L | (IPU_MCU_T_DEFAULT << 18),
			IPU_DISP_GEN);

	ret = ipu_submodules_init(ipu, pdev, ipu_base, ipu->clk);
	if (ret)
		goto failed_submodules_init;

	ret = ipu_add_client_devices(ipu, ipu_base);
	if (ret) {
		dev_err(&pdev->dev, "adding client devices failed with %d\n",
				ret);
		goto failed_add_clients;
	}

	dev_info(&pdev->dev, "%s probed\n", devtype->name);

	return 0;

failed_add_clients:
	ipu_submodules_exit(ipu);
failed_submodules_init:
out_failed_reset:
	ipu_irq_exit(ipu);
out_failed_irq:
	clk_disable_unprepare(ipu->clk);
	return ret;
}

static int ipu_remove(struct platform_device *pdev)
{
	struct ipu_soc *ipu = platform_get_drvdata(pdev);

	platform_device_unregister_children(pdev);
	ipu_submodules_exit(ipu);
	ipu_irq_exit(ipu);

	clk_disable_unprepare(ipu->clk);

	return 0;
}

static struct platform_driver imx_ipu_driver = {
	.driver = {
		.name = "imx-ipuv3",
		.of_match_table = imx_ipu_dt_ids,
	},
	.probe = ipu_probe,
	.remove = ipu_remove,
};

module_platform_driver(imx_ipu_driver);

MODULE_ALIAS("platform:imx-ipuv3");
MODULE_DESCRIPTION("i.MX IPU v3 driver");
MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
MODULE_LICENSE("GPL");